* [TOMOYO #15 1/8] Add in_execve flag into task_struct.
2009-02-05 8:18 [TOMOYO #15 0/8] TOMOYO Linux Kentaro Takeda
@ 2009-02-05 8:18 ` Kentaro Takeda
2009-02-05 8:18 ` [TOMOYO #15 2/8] Memory and pathname management functions Kentaro Takeda
` (7 subsequent siblings)
8 siblings, 0 replies; 23+ messages in thread
From: Kentaro Takeda @ 2009-02-05 8:18 UTC (permalink / raw)
To: jmorris
Cc: linux-security-module, linux-kernel, akpm, haradats, Tetsuo Handa,
David Howells
This patch allows LSM modules to determine whether current process is in an
execve operation or not so that they can behave differently while an execve
operation is in progress.
This patch is needed by TOMOYO. Please see another patch titled "LSM adapter
functions." for backgrounds.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: David Howells <dhowells@redhat.com>
---
fs/compat.c | 3 +++
fs/exec.c | 3 +++
include/linux/sched.h | 2 ++
3 files changed, 8 insertions(+)
--- security-testing-2.6.git.orig/fs/compat.c
+++ security-testing-2.6.git/fs/compat.c
@@ -1402,6 +1402,7 @@ int compat_do_execve(char * filename,
retval = mutex_lock_interruptible(¤t->cred_exec_mutex);
if (retval < 0)
goto out_free;
+ current->in_execve = 1;
retval = -ENOMEM;
bprm->cred = prepare_exec_creds();
@@ -1454,6 +1455,7 @@ int compat_do_execve(char * filename,
goto out;
/* execve succeeded */
+ current->in_execve = 0;
mutex_unlock(¤t->cred_exec_mutex);
acct_update_integrals(current);
free_bprm(bprm);
@@ -1470,6 +1472,7 @@ out_file:
}
out_unlock:
+ current->in_execve = 0;
mutex_unlock(¤t->cred_exec_mutex);
out_free:
--- security-testing-2.6.git.orig/fs/exec.c
+++ security-testing-2.6.git/fs/exec.c
@@ -1268,6 +1268,7 @@ int do_execve(char * filename,
retval = mutex_lock_interruptible(¤t->cred_exec_mutex);
if (retval < 0)
goto out_free;
+ current->in_execve = 1;
retval = -ENOMEM;
bprm->cred = prepare_exec_creds();
@@ -1321,6 +1322,7 @@ int do_execve(char * filename,
goto out;
/* execve succeeded */
+ current->in_execve = 0;
mutex_unlock(¤t->cred_exec_mutex);
acct_update_integrals(current);
free_bprm(bprm);
@@ -1339,6 +1341,7 @@ out_file:
}
out_unlock:
+ current->in_execve = 0;
mutex_unlock(¤t->cred_exec_mutex);
out_free:
--- security-testing-2.6.git.orig/include/linux/sched.h
+++ security-testing-2.6.git/include/linux/sched.h
@@ -1157,6 +1157,8 @@ struct task_struct {
/* ??? */
unsigned int personality;
unsigned did_exec:1;
+ unsigned in_execve:1; /* Tell the LSMs that the process is doing an
+ * execve */
pid_t pid;
pid_t tgid;
--
^ permalink raw reply [flat|nested] 23+ messages in thread* [TOMOYO #15 2/8] Memory and pathname management functions.
2009-02-05 8:18 [TOMOYO #15 0/8] TOMOYO Linux Kentaro Takeda
2009-02-05 8:18 ` [TOMOYO #15 1/8] Add in_execve flag into task_struct Kentaro Takeda
@ 2009-02-05 8:18 ` Kentaro Takeda
2009-02-05 8:18 ` [TOMOYO #15 3/8] Common functions for TOMOYO Linux Kentaro Takeda
` (6 subsequent siblings)
8 siblings, 0 replies; 23+ messages in thread
From: Kentaro Takeda @ 2009-02-05 8:18 UTC (permalink / raw)
To: jmorris
Cc: linux-security-module, linux-kernel, akpm, haradats,
Kentaro Takeda, Tetsuo Handa
TOMOYO Linux performs pathname based access control.
To remove factors that make pathname based access control difficult
(e.g. symbolic links, "..", "//" etc.), TOMOYO Linux derives realpath
of requested pathname from "struct dentry" and "struct vfsmount".
The maximum length of string data is limited to 4000 including trailing '\0'.
Since TOMOYO Linux uses '\ooo' style representation for non ASCII printable
characters, maybe TOMOYO Linux should be able to support 16336 (which means
(NAME_MAX * (PATH_MAX / (NAME_MAX + 1)) * 4 + (PATH_MAX / (NAME_MAX + 1)))
including trailing '\0'), but I think 4000 is enough for practical use.
TOMOYO uses only 0x21 - 0x7E (as printable characters) and 0x20 (as word
delimiter) and 0x0A (as line delimiter).
0x01 - 0x20 and 0x80 - 0xFF is handled in \ooo style representation.
The reason to use \ooo is to guarantee that "%s" won't damage logs.
Userland program can request
open("/tmp/file granted.\nAccess /tmp/file ", O_WRONLY | O_CREAT, 0600)
and logging such crazy pathname using "Access %s denied.\n" format will cause
"fabrication of logs" like
Access /tmp/file granted.
Access /tmp/file denied.
TOMOYO converts such characters to \ooo so that the logs will become
Access /tmp/file\040granted.\012Access\040/tmp/file denied.
and the administrator can read the logs safely using /bin/cat .
Likewise, a crazy request like
open("/tmp/\x01\x02\x03\x04\x05\x06\x07\x08\x09", O_WRONLY | O_CREAT, 0600)
will be processed safely by converting to
Access /tmp/\001\002\003\004\005\006\007\010\011 denied.
Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
---
security/tomoyo/realpath.c | 487 +++++++++++++++++++++++++++++++++++++++++++++
security/tomoyo/realpath.h | 63 +++++
2 files changed, 550 insertions(+)
--- /dev/null
+++ security-testing-2.6.git/security/tomoyo/realpath.c
@@ -0,0 +1,487 @@
+/*
+ * security/tomoyo/realpath.c
+ *
+ * Get the canonicalized absolute pathnames. The basis for TOMOYO.
+ *
+ * Copyright (C) 2005-2009 NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre 2009/02/01
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/mount.h>
+#include <linux/mnt_namespace.h>
+#include "common.h"
+#include "realpath.h"
+
+/**
+ * tomoyo_encode: Convert binary string to ascii string.
+ *
+ * @buffer: Buffer for ASCII string.
+ * @buflen: Size of @buffer.
+ * @str: Binary string.
+ *
+ * Returns 0 on success, -ENOMEM otherwise.
+ */
+int tomoyo_encode(char *buffer, int buflen, const char *str)
+{
+ while (1) {
+ const unsigned char c = *(unsigned char *) str++;
+
+ if (tomoyo_is_valid(c)) {
+ if (--buflen <= 0)
+ break;
+ *buffer++ = (char) c;
+ if (c != '\\')
+ continue;
+ if (--buflen <= 0)
+ break;
+ *buffer++ = (char) c;
+ continue;
+ }
+ if (!c) {
+ if (--buflen <= 0)
+ break;
+ *buffer = '\0';
+ return 0;
+ }
+ buflen -= 4;
+ if (buflen <= 0)
+ break;
+ *buffer++ = '\\';
+ *buffer++ = (c >> 6) + '0';
+ *buffer++ = ((c >> 3) & 7) + '0';
+ *buffer++ = (c & 7) + '0';
+ }
+ return -ENOMEM;
+}
+
+/**
+ * tomoyo_realpath_from_path2 - Returns realpath(3) of the given dentry but ignores chroot'ed root.
+ *
+ * @path: Pointer to "struct path".
+ * @newname: Pointer to buffer to return value in.
+ * @newname_len: Size of @newname.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * If dentry is a directory, trailing '/' is appended.
+ * Characters out of 0x20 < c < 0x7F range are converted to
+ * \ooo style octal string.
+ * Character \ is converted to \\ string.
+ */
+int tomoyo_realpath_from_path2(struct path *path, char *newname,
+ int newname_len)
+{
+ int error = -ENOMEM;
+ struct dentry *dentry = path->dentry;
+ char *sp;
+
+ if (!dentry || !path->mnt || !newname || newname_len <= 2048)
+ return -EINVAL;
+ if (dentry->d_op && dentry->d_op->d_dname) {
+ /* For "socket:[\$]" and "pipe:[\$]". */
+ static const int offset = 1536;
+ sp = dentry->d_op->d_dname(dentry, newname + offset,
+ newname_len - offset);
+ } else {
+ /* Taken from d_namespace_path(). */
+ struct path root;
+ struct path ns_root = { };
+ struct path tmp;
+
+ read_lock(¤t->fs->lock);
+ root = current->fs->root;
+ path_get(&root);
+ read_unlock(¤t->fs->lock);
+ spin_lock(&vfsmount_lock);
+ if (root.mnt && root.mnt->mnt_ns)
+ ns_root.mnt = mntget(root.mnt->mnt_ns->root);
+ if (ns_root.mnt)
+ ns_root.dentry = dget(ns_root.mnt->mnt_root);
+ spin_unlock(&vfsmount_lock);
+ spin_lock(&dcache_lock);
+ tmp = ns_root;
+ sp = __d_path(path, &tmp, newname, newname_len);
+ spin_unlock(&dcache_lock);
+ path_put(&root);
+ path_put(&ns_root);
+ }
+ if (IS_ERR(sp))
+ error = PTR_ERR(sp);
+ else
+ error = tomoyo_encode(newname, sp - newname, sp);
+ /* Append trailing '/' if dentry is a directory. */
+ if (!error && dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)
+ && *newname) {
+ sp = newname + strlen(newname);
+ if (*(sp - 1) != '/') {
+ if (sp < newname + newname_len - 4) {
+ *sp++ = '/';
+ *sp = '\0';
+ } else {
+ error = -ENOMEM;
+ }
+ }
+ }
+ if (error)
+ printk(KERN_WARNING "tomoyo_realpath: Pathname too long.\n");
+ return error;
+}
+
+/**
+ * tomoyo_realpath_from_path - Returns realpath(3) of the given pathname but ignores chroot'ed root.
+ *
+ * @path: Pointer to "struct path".
+ *
+ * Returns the realpath of the given @path on success, NULL otherwise.
+ *
+ * These functions use tomoyo_alloc(), so the caller must call tomoyo_free()
+ * if these functions didn't return NULL.
+ */
+char *tomoyo_realpath_from_path(struct path *path)
+{
+ char *buf = tomoyo_alloc(sizeof(struct tomoyo_page_buffer));
+
+ BUILD_BUG_ON(sizeof(struct tomoyo_page_buffer)
+ <= TOMOYO_MAX_PATHNAME_LEN - 1);
+ if (!buf)
+ return NULL;
+ if (tomoyo_realpath_from_path2(path, buf,
+ TOMOYO_MAX_PATHNAME_LEN - 1) == 0)
+ return buf;
+ tomoyo_free(buf);
+ return NULL;
+}
+
+/**
+ * tomoyo_realpath - Get realpath of a pathname.
+ *
+ * @pathname: The pathname to solve.
+ *
+ * Returns the realpath of @pathname on success, NULL otherwise.
+ */
+char *tomoyo_realpath(const char *pathname)
+{
+ struct nameidata nd;
+
+ if (pathname && path_lookup(pathname, LOOKUP_FOLLOW, &nd) == 0) {
+ char *buf = tomoyo_realpath_from_path(&nd.path);
+ path_put(&nd.path);
+ return buf;
+ }
+ return NULL;
+}
+
+/**
+ * tomoyo_realpath_nofollow - Get realpath of a pathname.
+ *
+ * @pathname: The pathname to solve.
+ *
+ * Returns the realpath of @pathname on success, NULL otherwise.
+ */
+char *tomoyo_realpath_nofollow(const char *pathname)
+{
+ struct nameidata nd;
+
+ if (pathname && path_lookup(pathname, 0, &nd) == 0) {
+ char *buf = tomoyo_realpath_from_path(&nd.path);
+ path_put(&nd.path);
+ return buf;
+ }
+ return NULL;
+}
+
+/* Memory allocated for non-string data. */
+static unsigned int tomoyo_allocated_memory_for_elements;
+/* Quota for holding non-string data. */
+static unsigned int tomoyo_quota_for_elements;
+
+/**
+ * tomoyo_alloc_element - Allocate permanent memory for structures.
+ *
+ * @size: Size in bytes.
+ *
+ * Returns pointer to allocated memory on success, NULL otherwise.
+ *
+ * Memory has to be zeroed.
+ * The RAM is chunked, so NEVER try to kfree() the returned pointer.
+ */
+void *tomoyo_alloc_element(const unsigned int size)
+{
+ static char *buf;
+ static DEFINE_MUTEX(lock);
+ static unsigned int buf_used_len = PATH_MAX;
+ char *ptr = NULL;
+ /*Assumes sizeof(void *) >= sizeof(long) is true. */
+ const unsigned int word_aligned_size
+ = roundup(size, max(sizeof(void *), sizeof(long)));
+ if (word_aligned_size > PATH_MAX)
+ return NULL;
+ /***** EXCLUSIVE SECTION START *****/
+ mutex_lock(&lock);
+ if (buf_used_len + word_aligned_size > PATH_MAX) {
+ if (!tomoyo_quota_for_elements ||
+ tomoyo_allocated_memory_for_elements
+ + PATH_MAX <= tomoyo_quota_for_elements)
+ ptr = kzalloc(PATH_MAX, GFP_KERNEL);
+ if (!ptr) {
+ printk(KERN_WARNING "ERROR: Out of memory "
+ "for tomoyo_alloc_element().\n");
+ if (!tomoyo_policy_loaded)
+ panic("MAC Initialization failed.\n");
+ } else {
+ buf = ptr;
+ tomoyo_allocated_memory_for_elements += PATH_MAX;
+ buf_used_len = word_aligned_size;
+ ptr = buf;
+ }
+ } else if (word_aligned_size) {
+ int i;
+ ptr = buf + buf_used_len;
+ buf_used_len += word_aligned_size;
+ for (i = 0; i < word_aligned_size; i++) {
+ if (!ptr[i])
+ continue;
+ printk(KERN_ERR "WARNING: Reserved memory was tainted! "
+ "The system might go wrong.\n");
+ ptr[i] = '\0';
+ }
+ }
+ mutex_unlock(&lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return ptr;
+}
+
+/* Memory allocated for string data in bytes. */
+static unsigned int tomoyo_allocated_memory_for_savename;
+/* Quota for holding string data in bytes. */
+static unsigned int tomoyo_quota_for_savename;
+
+/*
+ * TOMOYO uses this hash only when appending a string into the string
+ * table. Frequency of appending strings is very low. So we don't need
+ * large (e.g. 64k) hash size. 256 will be sufficient.
+ */
+#define TOMOYO_MAX_HASH 256
+
+/* Structure for string data. */
+struct tomoyo_name_entry {
+ struct list_head list;
+ struct tomoyo_path_info entry;
+};
+
+/* Structure for available memory region. */
+struct tomoyo_free_memory_block_list {
+ struct list_head list;
+ char *ptr; /* Pointer to a free area. */
+ int len; /* Length of the area. */
+};
+
+/*
+ * The list for "struct tomoyo_name_entry".
+ *
+ * This list is updated only inside tomoyo_save_name(), thus
+ * no global mutex exists.
+ */
+static struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
+
+/**
+ * tomoyo_save_name - Allocate permanent memory for string data.
+ *
+ * @name: The string to store into the permernent memory.
+ *
+ * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
+ *
+ * The RAM is shared, so NEVER try to modify or kfree() the returned name.
+ */
+const struct tomoyo_path_info *tomoyo_save_name(const char *name)
+{
+ static LIST_HEAD(fmb_list);
+ static DEFINE_MUTEX(lock);
+ struct tomoyo_name_entry *ptr;
+ unsigned int hash;
+ /* fmb contains available size in bytes.
+ fmb is removed from the fmb_list when fmb->len becomes 0. */
+ struct tomoyo_free_memory_block_list *fmb;
+ int len;
+ char *cp;
+
+ if (!name)
+ return NULL;
+ len = strlen(name) + 1;
+ if (len > TOMOYO_MAX_PATHNAME_LEN) {
+ printk(KERN_WARNING "ERROR: Name too long "
+ "for tomoyo_save_name().\n");
+ return NULL;
+ }
+ hash = full_name_hash((const unsigned char *) name, len - 1);
+ /***** EXCLUSIVE SECTION START *****/
+ mutex_lock(&lock);
+ list_for_each_entry(ptr, &tomoyo_name_list[hash % TOMOYO_MAX_HASH],
+ list) {
+ if (hash == ptr->entry.hash && !strcmp(name, ptr->entry.name))
+ goto out;
+ }
+ list_for_each_entry(fmb, &fmb_list, list) {
+ if (len <= fmb->len)
+ goto ready;
+ }
+ if (!tomoyo_quota_for_savename ||
+ tomoyo_allocated_memory_for_savename + PATH_MAX
+ <= tomoyo_quota_for_savename)
+ cp = kzalloc(PATH_MAX, GFP_KERNEL);
+ else
+ cp = NULL;
+ fmb = kzalloc(sizeof(*fmb), GFP_KERNEL);
+ if (!cp || !fmb) {
+ kfree(cp);
+ kfree(fmb);
+ printk(KERN_WARNING "ERROR: Out of memory "
+ "for tomoyo_save_name().\n");
+ if (!tomoyo_policy_loaded)
+ panic("MAC Initialization failed.\n");
+ ptr = NULL;
+ goto out;
+ }
+ tomoyo_allocated_memory_for_savename += PATH_MAX;
+ list_add(&fmb->list, &fmb_list);
+ fmb->ptr = cp;
+ fmb->len = PATH_MAX;
+ ready:
+ ptr = tomoyo_alloc_element(sizeof(*ptr));
+ if (!ptr)
+ goto out;
+ ptr->entry.name = fmb->ptr;
+ memmove(fmb->ptr, name, len);
+ tomoyo_fill_path_info(&ptr->entry);
+ fmb->ptr += len;
+ fmb->len -= len;
+ list_add_tail(&ptr->list, &tomoyo_name_list[hash % TOMOYO_MAX_HASH]);
+ if (fmb->len == 0) {
+ list_del(&fmb->list);
+ kfree(fmb);
+ }
+ out:
+ mutex_unlock(&lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return ptr ? &ptr->entry : NULL;
+}
+
+/**
+ * tomoyo_realpath_init - Initialize realpath related code.
+ *
+ * Returns 0.
+ */
+static int __init tomoyo_realpath_init(void)
+{
+ int i;
+
+ BUILD_BUG_ON(TOMOYO_MAX_PATHNAME_LEN > PATH_MAX);
+ for (i = 0; i < TOMOYO_MAX_HASH; i++)
+ INIT_LIST_HEAD(&tomoyo_name_list[i]);
+ INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list);
+ tomoyo_kernel_domain.domainname = tomoyo_save_name(TOMOYO_ROOT_NAME);
+ list_add_tail(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
+ down_read(&tomoyo_domain_list_lock);
+ if (tomoyo_find_domain(TOMOYO_ROOT_NAME) != &tomoyo_kernel_domain)
+ panic("Can't register tomoyo_kernel_domain");
+ up_read(&tomoyo_domain_list_lock);
+ return 0;
+}
+
+security_initcall(tomoyo_realpath_init);
+
+/* Memory allocated for temporary purpose. */
+static atomic_t tomoyo_dynamic_memory_size;
+
+/**
+ * tomoyo_alloc - Allocate memory for temporary purpose.
+ *
+ * @size: Size in bytes.
+ *
+ * Returns pointer to allocated memory on success, NULL otherwise.
+ */
+void *tomoyo_alloc(const size_t size)
+{
+ void *p = kzalloc(size, GFP_KERNEL);
+ if (p)
+ atomic_add(ksize(p), &tomoyo_dynamic_memory_size);
+ return p;
+}
+
+/**
+ * tomoyo_free - Release memory allocated by tomoyo_alloc().
+ *
+ * @p: Pointer returned by tomoyo_alloc(). May be NULL.
+ *
+ * Returns nothing.
+ */
+void tomoyo_free(const void *p)
+{
+ if (p) {
+ atomic_sub(ksize(p), &tomoyo_dynamic_memory_size);
+ kfree(p);
+ }
+}
+
+/**
+ * tomoyo_read_memory_counter - Check for memory usage in bytes.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns memory usage.
+ */
+int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head)
+{
+ if (!head->read_eof) {
+ const unsigned int shared
+ = tomoyo_allocated_memory_for_savename;
+ const unsigned int private
+ = tomoyo_allocated_memory_for_elements;
+ const unsigned int dynamic
+ = atomic_read(&tomoyo_dynamic_memory_size);
+ char buffer[64];
+
+ memset(buffer, 0, sizeof(buffer));
+ if (tomoyo_quota_for_savename)
+ snprintf(buffer, sizeof(buffer) - 1,
+ " (Quota: %10u)",
+ tomoyo_quota_for_savename);
+ else
+ buffer[0] = '\0';
+ tomoyo_io_printf(head, "Shared: %10u%s\n", shared, buffer);
+ if (tomoyo_quota_for_elements)
+ snprintf(buffer, sizeof(buffer) - 1,
+ " (Quota: %10u)",
+ tomoyo_quota_for_elements);
+ else
+ buffer[0] = '\0';
+ tomoyo_io_printf(head, "Private: %10u%s\n", private, buffer);
+ tomoyo_io_printf(head, "Dynamic: %10u\n", dynamic);
+ tomoyo_io_printf(head, "Total: %10u\n",
+ shared + private + dynamic);
+ head->read_eof = true;
+ }
+ return 0;
+}
+
+/**
+ * tomoyo_write_memory_quota - Set memory quota.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0.
+ */
+int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head)
+{
+ char *data = head->write_buf;
+ unsigned int size;
+
+ if (sscanf(data, "Shared: %u", &size) == 1)
+ tomoyo_quota_for_savename = size;
+ else if (sscanf(data, "Private: %u", &size) == 1)
+ tomoyo_quota_for_elements = size;
+ return 0;
+}
--- /dev/null
+++ security-testing-2.6.git/security/tomoyo/realpath.h
@@ -0,0 +1,63 @@
+/*
+ * security/tomoyo/realpath.h
+ *
+ * Get the canonicalized absolute pathnames. The basis for TOMOYO.
+ *
+ * Copyright (C) 2005-2009 NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre 2009/02/01
+ *
+ */
+
+#ifndef _SECURITY_TOMOYO_REALPATH_H
+#define _SECURITY_TOMOYO_REALPATH_H
+
+struct path;
+struct tomoyo_path_info;
+struct tomoyo_io_buffer;
+
+/* Convert binary string to ascii string. */
+int tomoyo_encode(char *buffer, int buflen, const char *str);
+
+/* Returns realpath(3) of the given pathname but ignores chroot'ed root. */
+int tomoyo_realpath_from_path2(struct path *path, char *newname,
+ int newname_len);
+
+/*
+ * Returns realpath(3) of the given pathname but ignores chroot'ed root.
+ * These functions use tomoyo_alloc(), so the caller must call tomoyo_free()
+ * if these functions didn't return NULL.
+ */
+char *tomoyo_realpath(const char *pathname);
+/*
+ * Same with tomoyo_realpath() except that it doesn't follow the final symlink.
+ */
+char *tomoyo_realpath_nofollow(const char *pathname);
+/* Same with tomoyo_realpath() except that the pathname is already solved. */
+char *tomoyo_realpath_from_path(struct path *path);
+
+/*
+ * Allocate memory for ACL entry.
+ * The RAM is chunked, so NEVER try to kfree() the returned pointer.
+ */
+void *tomoyo_alloc_element(const unsigned int size);
+
+/*
+ * Keep the given name on the RAM.
+ * The RAM is shared, so NEVER try to modify or kfree() the returned name.
+ */
+const struct tomoyo_path_info *tomoyo_save_name(const char *name);
+
+/* Allocate memory for temporary use (e.g. permission checks). */
+void *tomoyo_alloc(const size_t size);
+
+/* Free memory allocated by tomoyo_alloc(). */
+void tomoyo_free(const void *p);
+
+/* Check for memory usage. */
+int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head);
+
+/* Set memory quota. */
+int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head);
+
+#endif /* !defined(_SECURITY_TOMOYO_REALPATH_H) */
--
^ permalink raw reply [flat|nested] 23+ messages in thread* [TOMOYO #15 3/8] Common functions for TOMOYO Linux.
2009-02-05 8:18 [TOMOYO #15 0/8] TOMOYO Linux Kentaro Takeda
2009-02-05 8:18 ` [TOMOYO #15 1/8] Add in_execve flag into task_struct Kentaro Takeda
2009-02-05 8:18 ` [TOMOYO #15 2/8] Memory and pathname management functions Kentaro Takeda
@ 2009-02-05 8:18 ` Kentaro Takeda
2009-02-05 8:18 ` [TOMOYO #15 4/8] File operation restriction part Kentaro Takeda
` (5 subsequent siblings)
8 siblings, 0 replies; 23+ messages in thread
From: Kentaro Takeda @ 2009-02-05 8:18 UTC (permalink / raw)
To: jmorris
Cc: linux-security-module, linux-kernel, akpm, haradats,
Kentaro Takeda, Tetsuo Handa
This file contains common functions (e.g. policy I/O, pattern matching).
-------------------- About pattern matching --------------------
Since TOMOYO Linux is a name based access control, TOMOYO Linux seriously
considers "safe" string representation.
TOMOYO Linux's string manipulation functions make reviewers feel crazy,
but there are reasons why TOMOYO Linux needs its own string manipulation
functions.
----- Part 1 : preconditions -----
People definitely want to use wild card.
To support pattern matching, we have to support wild card characters.
In a typical Linux system, filenames are likely consists of only alphabets,
numbers, and some characters (e.g. + - ~ . / ).
But theoretically, the Linux kernel accepts all characters but NUL character
(which is used as a terminator of a string).
Some Linux systems can have filenames which contain * ? ** etc.
Therefore, we have to somehow modify string so that we can distinguish
wild card characters and normal characters.
It might be possible for some application's configuration files to restrict
acceptable characters.
It is impossible for kernel to restrict acceptable characters.
We can't accept approaches which will cause troubles for applications.
----- Part 2 : commonly used approaches -----
Text formatted strings separated by space character (0x20) and new line
character (0x0A) is more preferable for users over array of NUL-terminated
string.
Thus, people use text formatted configuration files separated by space
character and new line.
We sometimes need to handle non-printable characters.
Thus, people use \ character (0x5C) as escape character and represent
non-printable characters using octal or hexadecimal format.
At this point, we remind (at least) 3 approaches.
(1) Shell glob style expression
(2) POSIX regular expression (UNIX style regular expression)
(3) Maverick wild card expression
On the surface, (1) and (2) sound good choices. But they have a big pitfall.
All meta-characters in (1) and (2) are legal characters for representing
a pathname, and users easily write incorrect expression. What is worse, users
unlikely notice incorrect expressions because characters used for regular
pathnames unlikely contain meta-characters. This incorrect use of
meta-characters in pathname representation reveals vulnerability
(e.g. unexpected results) only when irregular pathname is specified.
The authors of TOMOYO Linux think that approaches which adds some character
for interpreting meta-characters as normal characters (i.e. (1) and (2)) are
not suitable for security use.
Therefore, the authors of TOMOYO Linux propose (3).
----- Part 3: consideration points -----
We need to solve encoding problem.
A single character can be represented in several ways using encodings.
For Japanese language, there are "ShiftJIS", "ISO-2022-JP", "EUC-JP",
"UTF-8" and more.
Some languages (e.g. Japanese language) supports multi-byte characters
(where a single character is represented using several bytes).
Some multi-byte characters may match the escape character.
For Japanese language, some characters in "ShiftJIS" encoding match
\ character, and bothering Web's CGI developers.
It is important that the kernel string is not bothered by encoding problem.
Linus said, "I really would expect that kernel strings don't have
an encoding. They're just C strings: a NUL-terminated stream of bytes."
http://lkml.org/lkml/2007/11/6/142
Yes. The kernel strings are just C strings.
We are talking about how to store and carry "kernel strings" safely.
If we store "kernel string" into policy file as-is, the "kernel string" will
be interpreted differently depending on application's encoding settings.
One application may interpret "kernel string" as "UTF-8",
another application may interpret "kernel string" as "ShiftJIS".
Therefore, we propose to represent strings using ASCII encoding.
In this way, we are no longer bothered by encoding problems.
We need to avoid information loss caused by display.
It is difficult to input and display non-printable characters, but we have to
be able to handle such characters because the kernel string is a C string.
If we use only ASCII printable characters (from 0x21 to 0x7E) and space
character (0x20) and new line character (0x0A), it is easy to input from
keyboard and display on all terminals which is running Linux.
Therefore, we propose to represent strings using only characters which value
is one of "from 0x21 to 0x7E", "0x20", "0x0A".
We need to consider ease of splitting strings from a line.
If we use an approach which uses "\ " for representing a space character
within a string, we have to count the string from the beginning to check
whether this space character is accompanied with \ character or not.
As a result, we cannot monotonically split a line using space character.
If we use an approach which uses "\040" for representing a space character
within a string, we can monotonically split a line using space character.
If we use an approach which uses NUL character as a delimiter, we cannot
use string manipulation functions for splitting strings from a line.
Therefore, we propose that we represent space character as "\040".
We need to avoid wrong designations (incorrect use of special characters).
Not all users can understand and utilize POSIX's regular expressions
correctly and perfectly.
If a character acts as a wild card by default, the user will get unexpected
result if that user didn't know the meaning of that character.
Therefore, we propose that all characters but \ character act as
a normal character and let the user add \ character to make a character
act as a wild card.
In this way, users needn't to know all wild card characters beforehand.
They can learn when they encountered an unseen wild card character
for their first time.
----- Part 4: supported wild card expressions -----
At this point, we have wild card expressions listed below.
+-----------+--------------------------------------------------------------+
| Wild card | Meaning and example |
+-----------+--------------------------------------------------------------+
| \* | More than or equals to 0 character other than '/'. |
| | /var/log/samba/\* |
+-----------+--------------------------------------------------------------+
| \@ | More than or equals to 0 character other than '/' or '.'. |
| | /var/www/html/\@.html |
+-----------+--------------------------------------------------------------+
| \? | 1 byte character other than '/'. |
| | /tmp/mail.\?\?\?\?\?\? |
+-----------+--------------------------------------------------------------+
| \$ | More than or equals to 1 decimal digit. |
| | /proc/\$/cmdline |
+-----------+--------------------------------------------------------------+
| \+ | 1 decimal digit. |
| | /var/tmp/my_work.\+ |
+-----------+--------------------------------------------------------------+
| \X | More than or equals to 1 hexadecimal digit. |
| | /var/tmp/my-work.\X |
+-----------+--------------------------------------------------------------+
| \x | 1 hexadecimal digit. |
| | /tmp/my-work.\x |
+-----------+--------------------------------------------------------------+
| \A | More than or equals to 1 alphabet character. |
| | /var/log/my-work/\$-\A-\$.log |
+-----------+--------------------------------------------------------------+
| \a | 1 alphabet character. |
| | /home/users/\a/\*/public_html/\*.html |
+-----------+--------------------------------------------------------------+
| \- | Pathname subtraction operator. |
| | +---------------------+------------------------------------+ |
| | | Example | Meaning | |
| | +---------------------+------------------------------------+ |
| | | /etc/\* | All files in /etc/ directory. | |
| | +---------------------+------------------------------------+ |
| | | /etc/\*\-\*shadow\* | /etc/\* other than /etc/\*shadow\* | |
| | +---------------------+------------------------------------+ |
| | | /\*\-proc\-sys/ | /\*/ other than /proc/ /sys/ | |
| | +---------------------+------------------------------------+ |
+-----------+--------------------------------------------------------------+
+----------------+---------------------------------------------------------+
| Representation | Meaning and example |
+----------------+---------------------------------------------------------+
| \\ | backslash character itself. |
+----------------+---------------------------------------------------------+
| \ooo | 1 byte character. |
| | ooo is 001 <= ooo <= 040 || 177 <= ooo <= 377. |
| | |
| | \040 for space character. |
| | \177 for del character. |
| | |
+----------------+---------------------------------------------------------+
----- Part 5: Advantages -----
We can obtain extensibility.
Since our proposed approach adds \ to a character to interpret as a wild
card, we can introduce new wild card in future while maintaining backward
compatibility.
We can process monotonically.
Since our proposed approach separates strings using a space character,
we can split strings using existing string manipulation functions.
We can reliably analyze access logs.
It is guaranteed that a string doesn't contain space character (0x20) and
new line character (0x0A).
It is guaranteed that a string won't be converted by FTP and won't be damaged
by a terminal's settings.
It is guaranteed that a string won't be affected by encoding converters
(except encodings which insert NUL character (e.g. UTF-16)).
----- Part 6: conclusion -----
TOMOYO Linux is using its own encoding with reasons described above.
There is a disadvantage that we need to introduce a series of new string
manipulation functions. But TOMOYO Linux's encoding is useful for all users
(including audit and AppArmor) who want to perform pattern matching and
safely exchange string information between the kernel and the userspace.
-------------------- About policy interface --------------------
TOMOYO Linux creates the following files on securityfs (normally
mounted on /sys/kernel/security) as interfaces between kernel and
userspace. These files are for TOMOYO Linux management tools *only*,
not for general programs.
* profile
* exception_policy
* domain_policy
* manager
* meminfo
* self_domain
* version
* .domain_status
* .process_status
** /sys/kernel/security/tomoyo/profile **
This file is used to read or write profiles.
"profile" means a running mode of process. A profile lists up
functions and their modes in "$number-$variable=$value" format. The
$number is profile number between 0 and 255. Each domain is assigned
one profile. To assign profile to domains, use "ccs-setprofile" or
"ccs-editpolicy" or "ccs-loadpolicy" commands.
(Example)
[root@tomoyo]# cat /sys/kernel/security/tomoyo/profile
0-COMMENT=-----Disabled Mode-----
0-MAC_FOR_FILE=disabled
0-MAX_ACCEPT_ENTRY=2048
0-TOMOYO_VERBOSE=disabled
1-COMMENT=-----Learning Mode-----
1-MAC_FOR_FILE=learning
1-MAX_ACCEPT_ENTRY=2048
1-TOMOYO_VERBOSE=disabled
2-COMMENT=-----Permissive Mode-----
2-MAC_FOR_FILE=permissive
2-MAX_ACCEPT_ENTRY=2048
2-TOMOYO_VERBOSE=enabled
3-COMMENT=-----Enforcing Mode-----
3-MAC_FOR_FILE=enforcing
3-MAX_ACCEPT_ENTRY=2048
3-TOMOYO_VERBOSE=enabled
- MAC_FOR_FILE:
Specifies access control level regarding file access requests.
- MAX_ACCEPT_ENTRY:
Limits the max number of ACL entries that are automatically appended
during learning mode. Default is 2048.
- TOMOYO_VERBOSE:
Specifies whether to print domain policy violation messages or not.
** /sys/kernel/security/tomoyo/manager **
This file is used to read or append the list of programs or domains
that can write to /sys/kernel/security/tomoyo interface. By default,
only processes with both UID = 0 and EUID = 0 can modify policy via
/sys/kernel/security/tomoyo interface. You can use keyword
"manage_by_non_root" to allow policy modification by non root user.
(Example)
[root@tomoyo]# cat /sys/kernel/security/tomoyo/manager
/usr/lib/ccs/loadpolicy
/usr/lib/ccs/editpolicy
/usr/lib/ccs/setlevel
/usr/lib/ccs/setprofile
/usr/lib/ccs/ld-watch
/usr/lib/ccs/ccs-queryd
** /sys/kernel/security/tomoyo/exception_policy **
This file is used to read and write system global settings. Each line
has a directive and operand pair. Directives are listed below.
- initialize_domain:
To initialize domain transition when specific program is executed,
use initialize_domain directive.
* initialize_domain "program" from "domain"
* initialize_domain "program" from "the last program part of domain"
* initialize_domain "program"
If the part "from" and after is not given, the entry is applied to
all domain. If the "domain" doesn't start with "<kernel>", the entry
is applied to all domain whose domainname ends with "the last program
part of domain".
This directive is intended to aggregate domain transitions for daemon
program and program that are invoked by the kernel on demand, by
transiting to different domain.
- keep_domain
To prevent domain transition when program is executed from specific
domain, use keep_domain directive.
* keep_domain "program" from "domain"
* keep_domain "program" from "the last program part of domain"
* keep_domain "domain"
* keep_domain "the last program part of domain"
If the part "from" and before is not given, this entry is applied to
all program. If the "domain" doesn't start with "<kernel>", the entry
is applied to all domain whose domainname ends with "the last program
part of domain".
This directive is intended to reduce total number of domains and
memory usage by suppressing unneeded domain transitions.
To declare domain keepers, use keep_domain directive followed by
domain definition.
Any process that belongs to any domain declared with this directive,
the process stays at the same domain unless any program registered
with initialize_domain directive is executed.
In order to control domain transition in detail, you can use
no_keep_domain/no_initialize_domain keywrods.
- alias:
To allow executing programs using the name of symbolic links, use
alias keyword followed by dereferenced pathname and reference
pathname. For example, /sbin/pidof is a symbolic link to
/sbin/killall5 . In normal case, if /sbin/pidof is executed, the
domain is defined as if /sbin/killall5 is executed. By specifying
"alias /sbin/killall5 /sbin/pidof", you can run /sbin/pidof in the
domain for /sbin/pidof .
(Example)
alias /sbin/killall5 /sbin/pidof
- allow_read:
To grant unconditionally readable permissions, use allow_read keyword
followed by canonicalized file. This keyword is intended to reduce
size of domain policy by granting read access to library files such
as GLIBC and locale files. Exception is, if ignore_global_allow_read
keyword is given to a domain, entries specified by this keyword are
ignored.
(Example)
allow_read /lib/libc-2.5.so
- file_pattern:
To declare pathname pattern, use file_pattern keyword followed by
pathname pattern. The pathname pattern must be a canonicalized
Pathname. This keyword is not applicable to neither granting execute
permissions nor domain definitions.
For example, canonicalized pathname that contains a process ID
(i.e. /proc/PID/ files) needs to be grouped in order to make access
control work well.
(Example)
file_pattern /proc/\$/cmdline
- path_group
To declare pathname group, use path_group keyword followed by name of
the group and pathname pattern. For example, if you want to group all
files under home directory, you can define
path_group HOME-DIR-FILE /home/\*/\*
path_group HOME-DIR-FILE /home/\*/\*/\*
path_group HOME-DIR-FILE /home/\*/\*/\*/\*
in the exception policy and use like
allow_read @HOME-DIR-FILE
to grant file access permission.
- deny_rewrite:
To deny overwriting already written contents of file (such as log
files) by default, use deny_rewrite keyword followed by pathname
pattern. Files whose pathname match the patterns are not permitted to
open for writing without append mode or truncate unless the pathnames
are explicitly granted using allow_rewrite keyword in domain policy.
(Example)
deny_rewrite /var/log/\*
- aggregator
To deal multiple programs as a single program, use aggregator keyword
followed by name of original program and aggregated program. This
keyword is intended to aggregate similar programs.
For example, /usr/bin/tac and /bin/cat are similar. By specifying
"aggregator /usr/bin/tac /bin/cat", you can run /usr/bin/tac in the
domain for /bin/cat .
For example, /usr/sbin/logrotate for Fedora Core 3 generates programs
like /tmp/logrotate.\?\?\?\?\?\? and run them, but TOMOYO Linux
doesn't allow using patterns for granting execute permission and
defining domains. By specifying
"aggregator /tmp/logrotate.\?\?\?\?\?\? /tmp/logrotate.tmp", you can
run /tmp/logrotate.\?\?\?\?\?\? as if /tmp/logrotate.tmp is running.
** /sys/kernel/security/tomoyo/domain_policy **
This file contains definition of all domains and permissions that are
granted to each domain.
Lines from the next line to a domain definition ( any lines starting
with "<kernel>") to the previous line to the next domain definitions
are interpreted as access permissions for that domain.
** /sys/kernel/security/tomoyo/meminfo **
This file is to show the total RAM used to keep policy in the kernel
by TOMOYO Linux in bytes.
(Example)
[root@tomoyo]# cat /sys/kernel/security/tomoyo/meminfo
Shared: 61440
Private: 69632
Dynamic: 768
Total: 131840
You can set memory quota by writing to this file.
(Example)
[root@tomoyo]# echo Shared: 2097152 > /sys/kernel/security/tomoyo/meminfo
[root@tomoyo]# echo Private: 2097152 > /sys/kernel/security/tomoyo/meminfo
** /sys/kernel/security/tomoyo/self_domain **
This file is to show the name of domain the caller process belongs to.
(Example)
[root@etch]# cat /sys/kernel/security/tomoyo/self_domain
<kernel> /usr/sbin/sshd /bin/zsh /bin/cat
** /sys/kernel/security/tomoyo/version **
This file is used for getting TOMOYO Linux's version.
(Example)
[root@etch]# cat /sys/kernel/security/tomoyo/version
2.2.0-pre
** /sys/kernel/security/tomoyo/.domain_status **
This is a view (of a DBMS) that contains only profile number and
domainnames of domain so that "ccs-setprofile" command can do
line-oriented processing easily.
** /sys/kernel/security/tomoyo/.process_status **
This file is used by "ccs-ccstree" command to show "list of processes
currently running" and "domains which each process belongs to" and
"profile number which the domain is currently assigned" like "pstree"
command. This file is writable by programs that aren't registered as
policy manager.
Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
---
security/tomoyo/common.c | 2202 +++++++++++++++++++++++++++++++++++++++++++++++
security/tomoyo/common.h | 359 +++++++
2 files changed, 2561 insertions(+)
--- /dev/null
+++ security-testing-2.6.git/security/tomoyo/common.c
@@ -0,0 +1,2202 @@
+/*
+ * security/tomoyo/common.c
+ *
+ * Common functions for TOMOYO.
+ *
+ * Copyright (C) 2005-2009 NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre 2009/02/01
+ *
+ */
+
+#include <linux/uaccess.h>
+#include <linux/security.h>
+#include <linux/hardirq.h>
+#include "realpath.h"
+#include "common.h"
+#include "tomoyo.h"
+
+/* Has loading policy done? */
+bool tomoyo_policy_loaded;
+
+/* String table for functionality that takes 4 modes. */
+static const char *tomoyo_mode_4[4] = {
+ "disabled", "learning", "permissive", "enforcing"
+};
+/* String table for functionality that takes 2 modes. */
+static const char *tomoyo_mode_2[4] = {
+ "disabled", "enabled", "enabled", "enabled"
+};
+
+/* Table for profile. */
+static struct {
+ const char *keyword;
+ unsigned int current_value;
+ const unsigned int max_value;
+} tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = {
+ [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 },
+ [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX },
+ [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 },
+};
+
+/* Profile table. Memory is allocated as needed. */
+static struct tomoyo_profile {
+ unsigned int value[TOMOYO_MAX_CONTROL_INDEX];
+ const struct tomoyo_path_info *comment;
+} *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
+
+/* Permit policy management by non-root user? */
+static bool tomoyo_manage_by_non_root;
+
+/* Utility functions. */
+
+/* Open operation for /sys/kernel/security/tomoyo/ interface. */
+static int tomoyo_open_control(const u8 type, struct file *file);
+/* Close /sys/kernel/security/tomoyo/ interface. */
+static int tomoyo_close_control(struct file *file);
+/* Read operation for /sys/kernel/security/tomoyo/ interface. */
+static int tomoyo_read_control(struct file *file, char __user *buffer,
+ const int buffer_len);
+/* Write operation for /sys/kernel/security/tomoyo/ interface. */
+static int tomoyo_write_control(struct file *file, const char __user *buffer,
+ const int buffer_len);
+
+/**
+ * tomoyo_is_byte_range - Check whether the string isa \ooo style octal value.
+ *
+ * @str: Pointer to the string.
+ *
+ * Returns true if @str is a \ooo style octal value, false otherwise.
+ *
+ * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
+ * This function verifies that \ooo is in valid range.
+ */
+static inline bool tomoyo_is_byte_range(const char *str)
+{
+ return *str >= '0' && *str++ <= '3' &&
+ *str >= '0' && *str++ <= '7' &&
+ *str >= '0' && *str <= '7';
+}
+
+/**
+ * tomoyo_is_alphabet_char - Check whether the character is an alphabet.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is an alphabet character, false otherwise.
+ */
+static inline bool tomoyo_is_alphabet_char(const char c)
+{
+ return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
+}
+
+/**
+ * tomoyo_make_byte - Make byte value from three octal characters.
+ *
+ * @c1: The first character.
+ * @c2: The second character.
+ * @c3: The third character.
+ *
+ * Returns byte value.
+ */
+static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
+{
+ return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
+}
+
+/**
+ * tomoyo_str_starts - Check whether the given string starts with the given keyword.
+ *
+ * @src: Pointer to pointer to the string.
+ * @find: Pointer to the keyword.
+ *
+ * Returns true if @src starts with @find, false otherwise.
+ *
+ * The @src is updated to point the first character after the @find
+ * if @src starts with @find.
+ */
+static bool tomoyo_str_starts(char **src, const char *find)
+{
+ const int len = strlen(find);
+ char *tmp = *src;
+
+ if (strncmp(tmp, find, len))
+ return false;
+ tmp += len;
+ *src = tmp;
+ return true;
+}
+
+/**
+ * tomoyo_normalize_line - Format string.
+ *
+ * @buffer: The line to normalize.
+ *
+ * Leading and trailing whitespaces are removed.
+ * Multiple whitespaces are packed into single space.
+ *
+ * Returns nothing.
+ */
+static void tomoyo_normalize_line(unsigned char *buffer)
+{
+ unsigned char *sp = buffer;
+ unsigned char *dp = buffer;
+ bool first = true;
+
+ while (tomoyo_is_invalid(*sp))
+ sp++;
+ while (*sp) {
+ if (!first)
+ *dp++ = ' ';
+ first = false;
+ while (tomoyo_is_valid(*sp))
+ *dp++ = *sp++;
+ while (tomoyo_is_invalid(*sp))
+ sp++;
+ }
+ *dp = '\0';
+}
+
+/**
+ * tomoyo_is_correct_path - Validate a pathname.
+ * @filename: The pathname to check.
+ * @start_type: Should the pathname start with '/'?
+ * 1 = must / -1 = must not / 0 = don't care
+ * @pattern_type: Can the pathname contain a wildcard?
+ * 1 = must / -1 = must not / 0 = don't care
+ * @end_type: Should the pathname end with '/'?
+ * 1 = must / -1 = must not / 0 = don't care
+ * @function: The name of function calling me.
+ *
+ * Check whether the given filename follows the naming rules.
+ * Returns true if @filename follows the naming rules, false otherwise.
+ */
+bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
+ const s8 pattern_type, const s8 end_type,
+ const char *function)
+{
+ bool contains_pattern = false;
+ unsigned char c;
+ unsigned char d;
+ unsigned char e;
+ const char *original_filename = filename;
+
+ if (!filename)
+ goto out;
+ c = *filename;
+ if (start_type == 1) { /* Must start with '/' */
+ if (c != '/')
+ goto out;
+ } else if (start_type == -1) { /* Must not start with '/' */
+ if (c == '/')
+ goto out;
+ }
+ if (c)
+ c = *(filename + strlen(filename) - 1);
+ if (end_type == 1) { /* Must end with '/' */
+ if (c != '/')
+ goto out;
+ } else if (end_type == -1) { /* Must not end with '/' */
+ if (c == '/')
+ goto out;
+ }
+ while ((c = *filename++) != '\0') {
+ if (c == '\\') {
+ switch ((c = *filename++)) {
+ case '\\': /* "\\" */
+ continue;
+ case '$': /* "\$" */
+ case '+': /* "\+" */
+ case '?': /* "\?" */
+ case '*': /* "\*" */
+ case '@': /* "\@" */
+ case 'x': /* "\x" */
+ case 'X': /* "\X" */
+ case 'a': /* "\a" */
+ case 'A': /* "\A" */
+ case '-': /* "\-" */
+ if (pattern_type == -1)
+ break; /* Must not contain pattern */
+ contains_pattern = true;
+ continue;
+ case '0': /* "\ooo" */
+ case '1':
+ case '2':
+ case '3':
+ d = *filename++;
+ if (d < '0' || d > '7')
+ break;
+ e = *filename++;
+ if (e < '0' || e > '7')
+ break;
+ c = tomoyo_make_byte(c, d, e);
+ if (tomoyo_is_invalid(c))
+ continue; /* pattern is not \000 */
+ }
+ goto out;
+ } else if (tomoyo_is_invalid(c)) {
+ goto out;
+ }
+ }
+ if (pattern_type == 1) { /* Must contain pattern */
+ if (!contains_pattern)
+ goto out;
+ }
+ return true;
+ out:
+ printk(KERN_DEBUG "%s: Invalid pathname '%s'\n", function,
+ original_filename);
+ return false;
+}
+
+/**
+ * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules.
+ * @domainname: The domainname to check.
+ * @function: The name of function calling me.
+ *
+ * Returns true if @domainname follows the naming rules, false otherwise.
+ */
+bool tomoyo_is_correct_domain(const unsigned char *domainname,
+ const char *function)
+{
+ unsigned char c;
+ unsigned char d;
+ unsigned char e;
+ const char *org_domainname = domainname;
+
+ if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
+ TOMOYO_ROOT_NAME_LEN))
+ goto out;
+ domainname += TOMOYO_ROOT_NAME_LEN;
+ if (!*domainname)
+ return true;
+ do {
+ if (*domainname++ != ' ')
+ goto out;
+ if (*domainname++ != '/')
+ goto out;
+ while ((c = *domainname) != '\0' && c != ' ') {
+ domainname++;
+ if (c == '\\') {
+ c = *domainname++;
+ switch ((c)) {
+ case '\\': /* "\\" */
+ continue;
+ case '0': /* "\ooo" */
+ case '1':
+ case '2':
+ case '3':
+ d = *domainname++;
+ if (d < '0' || d > '7')
+ break;
+ e = *domainname++;
+ if (e < '0' || e > '7')
+ break;
+ c = tomoyo_make_byte(c, d, e);
+ if (tomoyo_is_invalid(c))
+ /* pattern is not \000 */
+ continue;
+ }
+ goto out;
+ } else if (tomoyo_is_invalid(c)) {
+ goto out;
+ }
+ }
+ } while (*domainname);
+ return true;
+ out:
+ printk(KERN_DEBUG "%s: Invalid domainname '%s'\n", function,
+ org_domainname);
+ return false;
+}
+
+/**
+ * tomoyo_is_domain_def - Check whether the given token can be a domainname.
+ *
+ * @buffer: The token to check.
+ *
+ * Returns true if @buffer possibly be a domainname, false otherwise.
+ */
+bool tomoyo_is_domain_def(const unsigned char *buffer)
+{
+ return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN);
+}
+
+/**
+ * tomoyo_find_domain - Find a domain by the given name.
+ *
+ * @domainname: The domainname to find.
+ *
+ * Caller must call down_read(&tomoyo_domain_list_lock); or
+ * down_write(&tomoyo_domain_list_lock); .
+ *
+ * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
+ */
+struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
+{
+ struct tomoyo_domain_info *domain;
+ struct tomoyo_path_info name;
+
+ name.name = domainname;
+ tomoyo_fill_path_info(&name);
+ list_for_each_entry(domain, &tomoyo_domain_list, list) {
+ if (!domain->is_deleted &&
+ !tomoyo_pathcmp(&name, domain->domainname))
+ return domain;
+ }
+ return NULL;
+}
+
+/**
+ * tomoyo_path_depth - Evaluate the number of '/' in a string.
+ *
+ * @pathname: The string to evaluate.
+ *
+ * Returns path depth of the string.
+ *
+ * I score 2 for each of the '/' in the @pathname
+ * and score 1 if the @pathname ends with '/'.
+ */
+static int tomoyo_path_depth(const char *pathname)
+{
+ int i = 0;
+
+ if (pathname) {
+ const char *ep = pathname + strlen(pathname);
+ if (pathname < ep--) {
+ if (*ep != '/')
+ i++;
+ while (pathname <= ep)
+ if (*ep-- == '/')
+ i += 2;
+ }
+ }
+ return i;
+}
+
+/**
+ * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
+ *
+ * @filename: The string to evaluate.
+ *
+ * Returns the initial length without a pattern in @filename.
+ */
+static int tomoyo_const_part_length(const char *filename)
+{
+ char c;
+ int len = 0;
+
+ if (!filename)
+ return 0;
+ while ((c = *filename++) != '\0') {
+ if (c != '\\') {
+ len++;
+ continue;
+ }
+ c = *filename++;
+ switch (c) {
+ case '\\': /* "\\" */
+ len += 2;
+ continue;
+ case '0': /* "\ooo" */
+ case '1':
+ case '2':
+ case '3':
+ c = *filename++;
+ if (c < '0' || c > '7')
+ break;
+ c = *filename++;
+ if (c < '0' || c > '7')
+ break;
+ len += 4;
+ continue;
+ }
+ break;
+ }
+ return len;
+}
+
+/**
+ * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
+ *
+ * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
+ *
+ * The caller sets "struct tomoyo_path_info"->name.
+ */
+void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
+{
+ const char *name = ptr->name;
+ const int len = strlen(name);
+
+ ptr->total_len = len;
+ ptr->const_len = tomoyo_const_part_length(name);
+ ptr->is_dir = len && (name[len - 1] == '/');
+ ptr->is_patterned = (ptr->const_len < len);
+ ptr->hash = full_name_hash(name, len);
+ ptr->depth = tomoyo_path_depth(name);
+}
+
+/**
+ * tomoyo_file_matches_to_pattern2 - Pattern matching without '/' character
+ * and "\-" pattern.
+ *
+ * @filename: The start of string to check.
+ * @filename_end: The end of string to check.
+ * @pattern: The start of pattern to compare.
+ * @pattern_end: The end of pattern to compare.
+ *
+ * Returns true if @filename matches @pattern, false otherwise.
+ */
+static bool tomoyo_file_matches_to_pattern2(const char *filename,
+ const char *filename_end,
+ const char *pattern,
+ const char *pattern_end)
+{
+ while (filename < filename_end && pattern < pattern_end) {
+ char c;
+ if (*pattern != '\\') {
+ if (*filename++ != *pattern++)
+ return false;
+ continue;
+ }
+ c = *filename;
+ pattern++;
+ switch (*pattern) {
+ int i;
+ int j;
+ case '?':
+ if (c == '/') {
+ return false;
+ } else if (c == '\\') {
+ if (filename[1] == '\\')
+ filename++;
+ else if (tomoyo_is_byte_range(filename + 1))
+ filename += 3;
+ else
+ return false;
+ }
+ break;
+ case '\\':
+ if (c != '\\')
+ return false;
+ if (*++filename != '\\')
+ return false;
+ break;
+ case '+':
+ if (!isdigit(c))
+ return false;
+ break;
+ case 'x':
+ if (!isxdigit(c))
+ return false;
+ break;
+ case 'a':
+ if (!tomoyo_is_alphabet_char(c))
+ return false;
+ break;
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ if (c == '\\' && tomoyo_is_byte_range(filename + 1)
+ && strncmp(filename + 1, pattern, 3) == 0) {
+ filename += 3;
+ pattern += 2;
+ break;
+ }
+ return false; /* Not matched. */
+ case '*':
+ case '@':
+ for (i = 0; i <= filename_end - filename; i++) {
+ if (tomoyo_file_matches_to_pattern2(
+ filename + i, filename_end,
+ pattern + 1, pattern_end))
+ return true;
+ c = filename[i];
+ if (c == '.' && *pattern == '@')
+ break;
+ if (c != '\\')
+ continue;
+ if (filename[i + 1] == '\\')
+ i++;
+ else if (tomoyo_is_byte_range(filename + i + 1))
+ i += 3;
+ else
+ break; /* Bad pattern. */
+ }
+ return false; /* Not matched. */
+ default:
+ j = 0;
+ c = *pattern;
+ if (c == '$') {
+ while (isdigit(filename[j]))
+ j++;
+ } else if (c == 'X') {
+ while (isxdigit(filename[j]))
+ j++;
+ } else if (c == 'A') {
+ while (tomoyo_is_alphabet_char(filename[j]))
+ j++;
+ }
+ for (i = 1; i <= j; i++) {
+ if (tomoyo_file_matches_to_pattern2(
+ filename + i, filename_end,
+ pattern + 1, pattern_end))
+ return true;
+ }
+ return false; /* Not matched or bad pattern. */
+ }
+ filename++;
+ pattern++;
+ }
+ while (*pattern == '\\' &&
+ (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
+ pattern += 2;
+ return filename == filename_end && pattern == pattern_end;
+}
+
+/**
+ * tomoyo_file_matches_to_pattern - Pattern matching without without '/' character.
+ *
+ * @filename: The start of string to check.
+ * @filename_end: The end of string to check.
+ * @pattern: The start of pattern to compare.
+ * @pattern_end: The end of pattern to compare.
+ *
+ * Returns true if @filename matches @pattern, false otherwise.
+ */
+static bool tomoyo_file_matches_to_pattern(const char *filename,
+ const char *filename_end,
+ const char *pattern,
+ const char *pattern_end)
+{
+ const char *pattern_start = pattern;
+ bool first = true;
+ bool result;
+
+ while (pattern < pattern_end - 1) {
+ /* Split at "\-" pattern. */
+ if (*pattern++ != '\\' || *pattern++ != '-')
+ continue;
+ result = tomoyo_file_matches_to_pattern2(filename,
+ filename_end,
+ pattern_start,
+ pattern - 2);
+ if (first)
+ result = !result;
+ if (result)
+ return false;
+ first = false;
+ pattern_start = pattern;
+ }
+ result = tomoyo_file_matches_to_pattern2(filename, filename_end,
+ pattern_start, pattern_end);
+ return first ? result : !result;
+}
+
+/**
+ * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
+ * @filename: The filename to check.
+ * @pattern: The pattern to compare.
+ *
+ * Returns true if matches, false otherwise.
+ *
+ * The following patterns are available.
+ * \\ \ itself.
+ * \ooo Octal representation of a byte.
+ * \* More than or equals to 0 character other than '/'.
+ * \@ More than or equals to 0 character other than '/' or '.'.
+ * \? 1 byte character other than '/'.
+ * \$ More than or equals to 1 decimal digit.
+ * \+ 1 decimal digit.
+ * \X More than or equals to 1 hexadecimal digit.
+ * \x 1 hexadecimal digit.
+ * \A More than or equals to 1 alphabet character.
+ * \a 1 alphabet character.
+ * \- Subtraction operator.
+ */
+bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
+ const struct tomoyo_path_info *pattern)
+{
+ /*
+ if (!filename || !pattern)
+ return false;
+ */
+ const char *f = filename->name;
+ const char *p = pattern->name;
+ const int len = pattern->const_len;
+
+ /* If @pattern doesn't contain pattern, I can use strcmp(). */
+ if (!pattern->is_patterned)
+ return !tomoyo_pathcmp(filename, pattern);
+ /* Dont compare if the number of '/' differs. */
+ if (filename->depth != pattern->depth)
+ return false;
+ /* Compare the initial length without patterns. */
+ if (strncmp(f, p, len))
+ return false;
+ f += len;
+ p += len;
+ /* Main loop. Compare each directory component. */
+ while (*f && *p) {
+ const char *f_delimiter = strchr(f, '/');
+ const char *p_delimiter = strchr(p, '/');
+ if (!f_delimiter)
+ f_delimiter = f + strlen(f);
+ if (!p_delimiter)
+ p_delimiter = p + strlen(p);
+ if (!tomoyo_file_matches_to_pattern(f, f_delimiter,
+ p, p_delimiter))
+ return false;
+ f = f_delimiter;
+ if (*f)
+ f++;
+ p = p_delimiter;
+ if (*p)
+ p++;
+ }
+ /* Ignore trailing "\*" and "\@" in @pattern. */
+ while (*p == '\\' &&
+ (*(p + 1) == '*' || *(p + 1) == '@'))
+ p += 2;
+ return !*f && !*p;
+}
+
+/**
+ * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @fmt: The printf()'s format string, followed by parameters.
+ *
+ * Returns true if output was written, false otherwise.
+ *
+ * The snprintf() will truncate, but tomoyo_io_printf() won't.
+ */
+bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
+{
+ va_list args;
+ int len;
+ int pos = head->read_avail;
+ int size = head->readbuf_size - pos;
+
+ if (size <= 0)
+ return false;
+ va_start(args, fmt);
+ len = vsnprintf(head->read_buf + pos, size, fmt, args);
+ va_end(args);
+ if (pos + len >= head->readbuf_size)
+ return false;
+ head->read_avail += len;
+ return true;
+}
+
+/**
+ * tomoyo_get_exe - Get tomoyo_realpath() of current process.
+ *
+ * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
+ *
+ * This function uses tomoyo_alloc(), so the caller must call tomoyo_free()
+ * if this function didn't return NULL.
+ */
+static const char *tomoyo_get_exe(void)
+{
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma;
+ const char *cp = NULL;
+
+ if (!mm)
+ return NULL;
+ down_read(&mm->mmap_sem);
+ for (vma = mm->mmap; vma; vma = vma->vm_next) {
+ if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
+ cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
+ break;
+ }
+ }
+ up_read(&mm->mmap_sem);
+ return cp;
+}
+
+/**
+ * tomoyo_get_msg - Get warning message.
+ *
+ * @is_enforce: Is it enforcing mode?
+ *
+ * Returns "ERROR" or "WARNING".
+ */
+const char *tomoyo_get_msg(const bool is_enforce)
+{
+ if (is_enforce)
+ return "ERROR";
+ else
+ return "WARNING";
+}
+
+/**
+ * tomoyo_check_flags - Check mode for specified functionality.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @index: The functionality to check mode.
+ *
+ * TOMOYO checks only process context.
+ * This code disables TOMOYO's enforcement in case the function is called from
+ * interrupt context.
+ */
+unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
+ const u8 index)
+{
+ const u8 profile = domain->profile;
+
+ if (WARN_ON(in_interrupt()))
+ return 0;
+ return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX
+#if TOMOYO_MAX_PROFILES != 256
+ && profile < TOMOYO_MAX_PROFILES
+#endif
+ && tomoyo_profile_ptr[profile] ?
+ tomoyo_profile_ptr[profile]->value[index] : 0;
+}
+
+/**
+ * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ *
+ * Returns true if domain policy violation warning should be printed to
+ * console.
+ */
+bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain)
+{
+ return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0;
+}
+
+/**
+ * tomoyo_domain_quota_is_ok - Check for domain's quota.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ *
+ * Returns true if the domain is not exceeded quota, false otherwise.
+ */
+bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain)
+{
+ unsigned int count = 0;
+ struct tomoyo_acl_info *ptr;
+
+ if (!domain)
+ return true;
+ down_read(&tomoyo_domain_acl_info_list_lock);
+ list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ if (ptr->type & TOMOYO_ACL_DELETED)
+ continue;
+ switch (tomoyo_acl_type2(ptr)) {
+ struct tomoyo_single_path_acl_record *acl1;
+ struct tomoyo_double_path_acl_record *acl2;
+ u16 perm;
+ case TOMOYO_TYPE_SINGLE_PATH_ACL:
+ acl1 = container_of(ptr,
+ struct tomoyo_single_path_acl_record,
+ head);
+ perm = acl1->perm;
+ if (perm & (1 << TOMOYO_TYPE_EXECUTE_ACL))
+ count++;
+ if (perm &
+ ((1 << TOMOYO_TYPE_READ_ACL) |
+ (1 << TOMOYO_TYPE_WRITE_ACL)))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_CREATE_ACL))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_UNLINK_ACL))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_MKDIR_ACL))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_RMDIR_ACL))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_MKFIFO_ACL))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_MKSOCK_ACL))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_MKBLOCK_ACL))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_MKCHAR_ACL))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_TRUNCATE_ACL))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_SYMLINK_ACL))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_REWRITE_ACL))
+ count++;
+ break;
+ case TOMOYO_TYPE_DOUBLE_PATH_ACL:
+ acl2 = container_of(ptr,
+ struct tomoyo_double_path_acl_record,
+ head);
+ perm = acl2->perm;
+ if (perm & (1 << TOMOYO_TYPE_LINK_ACL))
+ count++;
+ if (perm & (1 << TOMOYO_TYPE_RENAME_ACL))
+ count++;
+ break;
+ }
+ }
+ up_read(&tomoyo_domain_acl_info_list_lock);
+ if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
+ return true;
+ if (!domain->quota_warned) {
+ domain->quota_warned = true;
+ printk(KERN_WARNING "TOMOYO-WARNING: "
+ "Domain '%s' has so many ACLs to hold. "
+ "Stopped learning mode.\n", domain->domainname->name);
+ }
+ return false;
+}
+
+/**
+ * tomoyo_find_or_assign_new_profile - Create a new profile.
+ *
+ * @profile: Profile number to create.
+ *
+ * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
+ */
+static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned
+ int profile)
+{
+ static DEFINE_MUTEX(lock);
+ struct tomoyo_profile *ptr = NULL;
+ int i;
+
+ if (profile >= TOMOYO_MAX_PROFILES)
+ return NULL;
+ /***** EXCLUSIVE SECTION START *****/
+ mutex_lock(&lock);
+ ptr = tomoyo_profile_ptr[profile];
+ if (ptr)
+ goto ok;
+ ptr = tomoyo_alloc_element(sizeof(*ptr));
+ if (!ptr)
+ goto ok;
+ for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++)
+ ptr->value[i] = tomoyo_control_array[i].current_value;
+ mb(); /* Avoid out-of-order execution. */
+ tomoyo_profile_ptr[profile] = ptr;
+ ok:
+ mutex_unlock(&lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return ptr;
+}
+
+/**
+ * tomoyo_write_profile - Write to profile table.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
+{
+ char *data = head->write_buf;
+ unsigned int i;
+ unsigned int value;
+ char *cp;
+ struct tomoyo_profile *profile;
+ unsigned long num;
+
+ cp = strchr(data, '-');
+ if (cp)
+ *cp = '\0';
+ if (strict_strtoul(data, 10, &num))
+ return -EINVAL;
+ if (cp)
+ data = cp + 1;
+ profile = tomoyo_find_or_assign_new_profile(num);
+ if (!profile)
+ return -EINVAL;
+ cp = strchr(data, '=');
+ if (!cp)
+ return -EINVAL;
+ *cp = '\0';
+ if (!strcmp(data, "COMMENT")) {
+ profile->comment = tomoyo_save_name(cp + 1);
+ return 0;
+ }
+ for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) {
+ if (strcmp(data, tomoyo_control_array[i].keyword))
+ continue;
+ if (sscanf(cp + 1, "%u", &value) != 1) {
+ int j;
+ const char **modes;
+ switch (i) {
+ case TOMOYO_VERBOSE:
+ modes = tomoyo_mode_2;
+ break;
+ default:
+ modes = tomoyo_mode_4;
+ break;
+ }
+ for (j = 0; j < 4; j++) {
+ if (strcmp(cp + 1, modes[j]))
+ continue;
+ value = j;
+ break;
+ }
+ if (j == 4)
+ return -EINVAL;
+ } else if (value > tomoyo_control_array[i].max_value) {
+ value = tomoyo_control_array[i].max_value;
+ }
+ profile->value[i] = value;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+/**
+ * tomoyo_read_profile - Read from profile table.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0.
+ */
+static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
+{
+ static const int total = TOMOYO_MAX_CONTROL_INDEX + 1;
+ int step;
+
+ if (head->read_eof)
+ return 0;
+ for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total;
+ step++) {
+ const u8 index = step / total;
+ u8 type = step % total;
+ const struct tomoyo_profile *profile
+ = tomoyo_profile_ptr[index];
+ head->read_step = step;
+ if (!profile)
+ continue;
+ if (!type) { /* Print profile' comment tag. */
+ if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n",
+ index, profile->comment ?
+ profile->comment->name : ""))
+ break;
+ continue;
+ }
+ type--;
+ if (type < TOMOYO_MAX_CONTROL_INDEX) {
+ const unsigned int value = profile->value[type];
+ const char **modes = NULL;
+ const char *keyword
+ = tomoyo_control_array[type].keyword;
+ switch (tomoyo_control_array[type].max_value) {
+ case 3:
+ modes = tomoyo_mode_4;
+ break;
+ case 1:
+ modes = tomoyo_mode_2;
+ break;
+ }
+ if (modes) {
+ if (!tomoyo_io_printf(head, "%u-%s=%s\n", index,
+ keyword, modes[value]))
+ break;
+ } else {
+ if (!tomoyo_io_printf(head, "%u-%s=%u\n", index,
+ keyword, value))
+ break;
+ }
+ }
+ }
+ if (step == TOMOYO_MAX_PROFILES * total)
+ head->read_eof = true;
+ return 0;
+}
+
+/* Structure for policy manager. */
+struct tomoyo_policy_manager_entry {
+ struct list_head list;
+ /* A path to program or a domainname. */
+ const struct tomoyo_path_info *manager;
+ bool is_domain; /* True if manager is a domainname. */
+ bool is_deleted; /* True if this entry is deleted. */
+};
+
+/* The list for "struct tomoyo_policy_manager_entry". */
+static LIST_HEAD(tomoyo_policy_manager_list);
+static DECLARE_RWSEM(tomoyo_policy_manager_list_lock);
+
+/**
+ * tomoyo_update_manager_entry - Add a manager entry.
+ *
+ * @manager: The path to manager or the domainnamme.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_update_manager_entry(const char *manager,
+ const bool is_delete)
+{
+ struct tomoyo_policy_manager_entry *new_entry;
+ struct tomoyo_policy_manager_entry *ptr;
+ const struct tomoyo_path_info *saved_manager;
+ int error = -ENOMEM;
+ bool is_domain = false;
+
+ if (tomoyo_is_domain_def(manager)) {
+ if (!tomoyo_is_correct_domain(manager, __func__))
+ return -EINVAL;
+ is_domain = true;
+ } else {
+ if (!tomoyo_is_correct_path(manager, 1, -1, -1, __func__))
+ return -EINVAL;
+ }
+ saved_manager = tomoyo_save_name(manager);
+ if (!saved_manager)
+ return -ENOMEM;
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_policy_manager_list_lock);
+ list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
+ if (ptr->manager != saved_manager)
+ continue;
+ ptr->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ new_entry = tomoyo_alloc_element(sizeof(*new_entry));
+ if (!new_entry)
+ goto out;
+ new_entry->manager = saved_manager;
+ new_entry->is_domain = is_domain;
+ list_add_tail(&new_entry->list, &tomoyo_policy_manager_list);
+ error = 0;
+ out:
+ up_write(&tomoyo_policy_manager_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return error;
+}
+
+/**
+ * tomoyo_write_manager_policy - Write manager policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
+{
+ char *data = head->write_buf;
+ bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
+
+ if (!strcmp(data, "manage_by_non_root")) {
+ tomoyo_manage_by_non_root = !is_delete;
+ return 0;
+ }
+ return tomoyo_update_manager_entry(data, is_delete);
+}
+
+/**
+ * tomoyo_read_manager_policy - Read manager policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0.
+ */
+static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
+{
+ struct list_head *pos;
+ bool done = true;
+
+ if (head->read_eof)
+ return 0;
+ down_read(&tomoyo_policy_manager_list_lock);
+ list_for_each_cookie(pos, head->read_var2,
+ &tomoyo_policy_manager_list) {
+ struct tomoyo_policy_manager_entry *ptr;
+ ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
+ list);
+ if (ptr->is_deleted)
+ continue;
+ if (!tomoyo_io_printf(head, "%s\n", ptr->manager->name)) {
+ done = false;
+ break;
+ }
+ }
+ up_read(&tomoyo_policy_manager_list_lock);
+ head->read_eof = done;
+ return 0;
+}
+
+/**
+ * tomoyo_is_policy_manager - Check whether the current process is a policy manager.
+ *
+ * Returns true if the current process is permitted to modify policy
+ * via /sys/kernel/security/tomoyo/ interface.
+ */
+static bool tomoyo_is_policy_manager(void)
+{
+ struct tomoyo_policy_manager_entry *ptr;
+ const char *exe;
+ const struct task_struct *task = current;
+ const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
+ bool found = false;
+
+ if (!tomoyo_policy_loaded)
+ return true;
+ if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
+ return false;
+ down_read(&tomoyo_policy_manager_list_lock);
+ list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
+ if (!ptr->is_deleted && ptr->is_domain
+ && !tomoyo_pathcmp(domainname, ptr->manager)) {
+ found = true;
+ break;
+ }
+ }
+ up_read(&tomoyo_policy_manager_list_lock);
+ if (found)
+ return true;
+ exe = tomoyo_get_exe();
+ if (!exe)
+ return false;
+ down_read(&tomoyo_policy_manager_list_lock);
+ list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
+ if (!ptr->is_deleted && !ptr->is_domain
+ && !strcmp(exe, ptr->manager->name)) {
+ found = true;
+ break;
+ }
+ }
+ up_read(&tomoyo_policy_manager_list_lock);
+ if (!found) { /* Reduce error messages. */
+ static pid_t last_pid;
+ const pid_t pid = current->pid;
+ if (last_pid != pid) {
+ printk(KERN_WARNING "%s ( %s ) is not permitted to "
+ "update policies.\n", domainname->name, exe);
+ last_pid = pid;
+ }
+ }
+ tomoyo_free(exe);
+ return found;
+}
+
+/**
+ * tomoyo_is_select_one - Parse select command.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @data: String to parse.
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
+ const char *data)
+{
+ unsigned int pid;
+ struct tomoyo_domain_info *domain = NULL;
+
+ if (sscanf(data, "pid=%u", &pid) == 1) {
+ struct task_struct *p;
+ /***** CRITICAL SECTION START *****/
+ read_lock(&tasklist_lock);
+ p = find_task_by_vpid(pid);
+ if (p)
+ domain = tomoyo_real_domain(p);
+ read_unlock(&tasklist_lock);
+ /***** CRITICAL SECTION END *****/
+ } else if (!strncmp(data, "domain=", 7)) {
+ if (tomoyo_is_domain_def(data + 7)) {
+ down_read(&tomoyo_domain_list_lock);
+ domain = tomoyo_find_domain(data + 7);
+ up_read(&tomoyo_domain_list_lock);
+ }
+ } else
+ return false;
+ head->write_var1 = domain;
+ /* Accessing read_buf is safe because head->io_sem is held. */
+ if (!head->read_buf)
+ return true; /* Do nothing if open(O_WRONLY). */
+ head->read_avail = 0;
+ tomoyo_io_printf(head, "# select %s\n", data);
+ head->read_single_domain = true;
+ head->read_eof = !domain;
+ if (domain) {
+ struct tomoyo_domain_info *d;
+ head->read_var1 = NULL;
+ down_read(&tomoyo_domain_list_lock);
+ list_for_each_entry(d, &tomoyo_domain_list, list) {
+ if (d == domain)
+ break;
+ head->read_var1 = &d->list;
+ }
+ up_read(&tomoyo_domain_list_lock);
+ head->read_var2 = NULL;
+ head->read_bit = 0;
+ head->read_step = 0;
+ if (domain->is_deleted)
+ tomoyo_io_printf(head, "# This is a deleted domain.\n");
+ }
+ return true;
+}
+
+/**
+ * tomoyo_write_domain_policy - Write domain policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
+{
+ char *data = head->write_buf;
+ struct tomoyo_domain_info *domain = head->write_var1;
+ bool is_delete = false;
+ bool is_select = false;
+ bool is_undelete = false;
+ unsigned int profile;
+
+ if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
+ is_delete = true;
+ else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
+ is_select = true;
+ else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_UNDELETE))
+ is_undelete = true;
+ if (is_select && tomoyo_is_select_one(head, data))
+ return 0;
+ /* Don't allow updating policies by non manager programs. */
+ if (!tomoyo_is_policy_manager())
+ return -EPERM;
+ if (tomoyo_is_domain_def(data)) {
+ domain = NULL;
+ if (is_delete)
+ tomoyo_delete_domain(data);
+ else if (is_select) {
+ down_read(&tomoyo_domain_list_lock);
+ domain = tomoyo_find_domain(data);
+ up_read(&tomoyo_domain_list_lock);
+ } else if (is_undelete)
+ domain = tomoyo_undelete_domain(data);
+ else
+ domain = tomoyo_find_or_assign_new_domain(data, 0);
+ head->write_var1 = domain;
+ return 0;
+ }
+ if (!domain)
+ return -EINVAL;
+
+ if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
+ && profile < TOMOYO_MAX_PROFILES) {
+ if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
+ domain->profile = (u8) profile;
+ return 0;
+ }
+ if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
+ tomoyo_set_domain_flag(domain, is_delete,
+ TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ);
+ return 0;
+ }
+ return tomoyo_write_file_policy(data, domain, is_delete);
+}
+
+/**
+ * tomoyo_print_single_path_acl - Print a single path ACL entry.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr: Pointer to "struct tomoyo_single_path_acl_record".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_print_single_path_acl(struct tomoyo_io_buffer *head,
+ struct tomoyo_single_path_acl_record *
+ ptr)
+{
+ int pos;
+ u8 bit;
+ const char *atmark = "";
+ const char *filename;
+ const u16 perm = ptr->perm;
+
+ filename = ptr->filename->name;
+ for (bit = head->read_bit; bit < TOMOYO_MAX_SINGLE_PATH_OPERATION;
+ bit++) {
+ const char *msg;
+ if (!(perm & (1 << bit)))
+ continue;
+ /* Print "read/write" instead of "read" and "write". */
+ if ((bit == TOMOYO_TYPE_READ_ACL ||
+ bit == TOMOYO_TYPE_WRITE_ACL)
+ && (perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)))
+ continue;
+ msg = tomoyo_sp2keyword(bit);
+ pos = head->read_avail;
+ if (!tomoyo_io_printf(head, "allow_%s %s%s\n", msg,
+ atmark, filename))
+ goto out;
+ }
+ head->read_bit = 0;
+ return true;
+ out:
+ head->read_bit = bit;
+ head->read_avail = pos;
+ return false;
+}
+
+/**
+ * tomoyo_print_double_path_acl - Print a double path ACL entry.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr: Pointer to "struct tomoyo_double_path_acl_record".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_print_double_path_acl(struct tomoyo_io_buffer *head,
+ struct tomoyo_double_path_acl_record *
+ ptr)
+{
+ int pos;
+ const char *atmark1 = "";
+ const char *atmark2 = "";
+ const char *filename1;
+ const char *filename2;
+ const u8 perm = ptr->perm;
+ u8 bit;
+
+ filename1 = ptr->filename1->name;
+ filename2 = ptr->filename2->name;
+ for (bit = head->read_bit; bit < TOMOYO_MAX_DOUBLE_PATH_OPERATION;
+ bit++) {
+ const char *msg;
+ if (!(perm & (1 << bit)))
+ continue;
+ msg = tomoyo_dp2keyword(bit);
+ pos = head->read_avail;
+ if (!tomoyo_io_printf(head, "allow_%s %s%s %s%s\n", msg,
+ atmark1, filename1, atmark2, filename2))
+ goto out;
+ }
+ head->read_bit = 0;
+ return true;
+ out:
+ head->read_bit = bit;
+ head->read_avail = pos;
+ return false;
+}
+
+/**
+ * tomoyo_print_entry - Print an ACL entry.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr: Pointer to an ACL entry.
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
+ struct tomoyo_acl_info *ptr)
+{
+ const u8 acl_type = tomoyo_acl_type2(ptr);
+
+ if (acl_type & TOMOYO_ACL_DELETED)
+ return true;
+ if (acl_type == TOMOYO_TYPE_SINGLE_PATH_ACL) {
+ struct tomoyo_single_path_acl_record *acl
+ = container_of(ptr,
+ struct tomoyo_single_path_acl_record,
+ head);
+ return tomoyo_print_single_path_acl(head, acl);
+ }
+ if (acl_type == TOMOYO_TYPE_DOUBLE_PATH_ACL) {
+ struct tomoyo_double_path_acl_record *acl
+ = container_of(ptr,
+ struct tomoyo_double_path_acl_record,
+ head);
+ return tomoyo_print_double_path_acl(head, acl);
+ }
+ BUG(); /* This must not happen. */
+ return false;
+}
+
+/**
+ * tomoyo_read_domain_policy - Read domain policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0.
+ */
+static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
+{
+ struct list_head *dpos;
+ struct list_head *apos;
+ bool done = true;
+
+ if (head->read_eof)
+ return 0;
+ if (head->read_step == 0)
+ head->read_step = 1;
+ down_read(&tomoyo_domain_list_lock);
+ list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
+ struct tomoyo_domain_info *domain;
+ const char *quota_exceeded = "";
+ const char *transition_failed = "";
+ const char *ignore_global_allow_read = "";
+ domain = list_entry(dpos, struct tomoyo_domain_info, list);
+ if (head->read_step != 1)
+ goto acl_loop;
+ if (domain->is_deleted && !head->read_single_domain)
+ continue;
+ /* Print domainname and flags. */
+ if (domain->quota_warned)
+ quota_exceeded = "quota_exceeded\n";
+ if (domain->flags & TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED)
+ transition_failed = "transition_failed\n";
+ if (domain->flags &
+ TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ)
+ ignore_global_allow_read
+ = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
+ if (!tomoyo_io_printf(head,
+ "%s\n" TOMOYO_KEYWORD_USE_PROFILE "%u\n"
+ "%s%s%s\n", domain->domainname->name,
+ domain->profile, quota_exceeded,
+ transition_failed,
+ ignore_global_allow_read)) {
+ done = false;
+ break;
+ }
+ head->read_step = 2;
+acl_loop:
+ if (head->read_step == 3)
+ goto tail_mark;
+ /* Print ACL entries in the domain. */
+ down_read(&tomoyo_domain_acl_info_list_lock);
+ list_for_each_cookie(apos, head->read_var2,
+ &domain->acl_info_list) {
+ struct tomoyo_acl_info *ptr
+ = list_entry(apos, struct tomoyo_acl_info,
+ list);
+ if (!tomoyo_print_entry(head, ptr)) {
+ done = false;
+ break;
+ }
+ }
+ up_read(&tomoyo_domain_acl_info_list_lock);
+ if (!done)
+ break;
+ head->read_step = 3;
+tail_mark:
+ if (!tomoyo_io_printf(head, "\n")) {
+ done = false;
+ break;
+ }
+ head->read_step = 1;
+ if (head->read_single_domain)
+ break;
+ }
+ up_read(&tomoyo_domain_list_lock);
+ head->read_eof = done;
+ return 0;
+}
+
+/**
+ * tomoyo_write_domain_profile - Assign profile for specified domain.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, -EINVAL otherwise.
+ *
+ * This is equivalent to doing
+ *
+ * ( echo "select " $domainname; echo "use_profile " $profile ) |
+ * /usr/lib/ccs/loadpolicy -d
+ */
+static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
+{
+ char *data = head->write_buf;
+ char *cp = strchr(data, ' ');
+ struct tomoyo_domain_info *domain;
+ unsigned long profile;
+
+ if (!cp)
+ return -EINVAL;
+ *cp = '\0';
+ down_read(&tomoyo_domain_list_lock);
+ domain = tomoyo_find_domain(cp + 1);
+ up_read(&tomoyo_domain_list_lock);
+ if (strict_strtoul(data, 10, &profile))
+ return -EINVAL;
+ if (domain && profile < TOMOYO_MAX_PROFILES
+ && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
+ domain->profile = (u8) profile;
+ return 0;
+}
+
+/**
+ * tomoyo_read_domain_profile - Read only domainname and profile.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns list of profile number and domainname pairs.
+ *
+ * This is equivalent to doing
+ *
+ * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
+ * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
+ * domainname = $0; } else if ( $1 == "use_profile" ) {
+ * print $2 " " domainname; domainname = ""; } } ; '
+ */
+static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
+{
+ struct list_head *pos;
+ bool done = true;
+
+ if (head->read_eof)
+ return 0;
+ down_read(&tomoyo_domain_list_lock);
+ list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
+ struct tomoyo_domain_info *domain;
+ domain = list_entry(pos, struct tomoyo_domain_info, list);
+ if (domain->is_deleted)
+ continue;
+ if (!tomoyo_io_printf(head, "%u %s\n", domain->profile,
+ domain->domainname->name)) {
+ done = false;
+ break;
+ }
+ }
+ up_read(&tomoyo_domain_list_lock);
+ head->read_eof = done;
+ return 0;
+}
+
+/**
+ * tomoyo_write_pid: Specify PID to obtain domainname.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0.
+ */
+static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
+{
+ unsigned long pid;
+ /* No error check. */
+ strict_strtoul(head->write_buf, 10, &pid);
+ head->read_step = (int) pid;
+ head->read_eof = false;
+ return 0;
+}
+
+/**
+ * tomoyo_read_pid - Get domainname of the specified PID.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns the domainname which the specified PID is in on success,
+ * empty string otherwise.
+ * The PID is specified by tomoyo_write_pid() so that the user can obtain
+ * using read()/write() interface rather than sysctl() interface.
+ */
+static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
+{
+ if (head->read_avail == 0 && !head->read_eof) {
+ const int pid = head->read_step;
+ struct task_struct *p;
+ struct tomoyo_domain_info *domain = NULL;
+ /***** CRITICAL SECTION START *****/
+ read_lock(&tasklist_lock);
+ p = find_task_by_vpid(pid);
+ if (p)
+ domain = tomoyo_real_domain(p);
+ read_unlock(&tasklist_lock);
+ /***** CRITICAL SECTION END *****/
+ if (domain)
+ tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
+ domain->domainname->name);
+ head->read_eof = true;
+ }
+ return 0;
+}
+
+/**
+ * tomoyo_write_exception_policy - Write exception policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
+{
+ char *data = head->write_buf;
+ bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
+
+ if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
+ return tomoyo_write_domain_keeper_policy(data, false,
+ is_delete);
+ if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
+ return tomoyo_write_domain_keeper_policy(data, true, is_delete);
+ if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
+ return tomoyo_write_domain_initializer_policy(data, false,
+ is_delete);
+ if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
+ return tomoyo_write_domain_initializer_policy(data, true,
+ is_delete);
+ if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
+ return tomoyo_write_alias_policy(data, is_delete);
+ if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
+ return tomoyo_write_globally_readable_policy(data, is_delete);
+ if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
+ return tomoyo_write_pattern_policy(data, is_delete);
+ if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
+ return tomoyo_write_no_rewrite_policy(data, is_delete);
+ return -EINVAL;
+}
+
+/**
+ * tomoyo_read_exception_policy - Read exception policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, -EINVAL otherwise.
+ */
+static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
+{
+ if (!head->read_eof) {
+ switch (head->read_step) {
+ case 0:
+ head->read_var2 = NULL;
+ head->read_step = 1;
+ case 1:
+ if (!tomoyo_read_domain_keeper_policy(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 2;
+ case 2:
+ if (!tomoyo_read_globally_readable_policy(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 3;
+ case 3:
+ head->read_var2 = NULL;
+ head->read_step = 4;
+ case 4:
+ if (!tomoyo_read_domain_initializer_policy(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 5;
+ case 5:
+ if (!tomoyo_read_alias_policy(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 6;
+ case 6:
+ head->read_var2 = NULL;
+ head->read_step = 7;
+ case 7:
+ if (!tomoyo_read_file_pattern(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 8;
+ case 8:
+ if (!tomoyo_read_no_rewrite_policy(head))
+ break;
+ head->read_var2 = NULL;
+ head->read_step = 9;
+ case 9:
+ head->read_eof = true;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+/* path to policy loader */
+static const char *tomoyo_loader = "/sbin/tomoyo-init";
+
+/**
+ * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
+ *
+ * Returns true if /sbin/tomoyo-init exists, false otherwise.
+ */
+static bool tomoyo_policy_loader_exists(void)
+{
+ /*
+ * Don't activate MAC if the policy loader doesn't exist.
+ * If the initrd includes /sbin/init but real-root-dev has not
+ * mounted on / yet, activating MAC will block the system since
+ * policies are not loaded yet.
+ * Thus, let do_execve() call this function everytime.
+ */
+ struct nameidata nd;
+
+ if (path_lookup(tomoyo_loader, LOOKUP_FOLLOW, &nd)) {
+ printk(KERN_INFO "Not activating Mandatory Access Control now "
+ "since %s doesn't exist.\n", tomoyo_loader);
+ return false;
+ }
+ path_put(&nd.path);
+ return true;
+}
+
+/**
+ * tomoyo_load_policy - Run external policy loader to load policy.
+ *
+ * @filename: The program about to start.
+ *
+ * This function checks whether @filename is /sbin/init , and if so
+ * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
+ * and then continues invocation of /sbin/init.
+ * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
+ * writes to /sys/kernel/security/tomoyo/ interfaces.
+ *
+ * Returns nothing.
+ */
+void tomoyo_load_policy(const char *filename)
+{
+ char *argv[2];
+ char *envp[3];
+
+ if (tomoyo_policy_loaded)
+ return;
+ /*
+ * Check filename is /sbin/init or /sbin/tomoyo-start.
+ * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
+ * be passed.
+ * You can create /sbin/tomoyo-start by
+ * "ln -s /bin/true /sbin/tomoyo-start".
+ */
+ if (strcmp(filename, "/sbin/init") &&
+ strcmp(filename, "/sbin/tomoyo-start"))
+ return;
+ if (!tomoyo_policy_loader_exists())
+ return;
+
+ printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
+ tomoyo_loader);
+ argv[0] = (char *) tomoyo_loader;
+ argv[1] = NULL;
+ envp[0] = "HOME=/";
+ envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+ envp[2] = NULL;
+ call_usermodehelper(argv[0], argv, envp, 1);
+
+ printk(KERN_INFO "TOMOYO: 2.2.0-pre 2009/02/01\n");
+ printk(KERN_INFO "Mandatory Access Control activated.\n");
+ tomoyo_policy_loaded = true;
+ { /* Check all profiles currently assigned to domains are defined. */
+ struct tomoyo_domain_info *domain;
+ down_read(&tomoyo_domain_list_lock);
+ list_for_each_entry(domain, &tomoyo_domain_list, list) {
+ const u8 profile = domain->profile;
+ if (tomoyo_profile_ptr[profile])
+ continue;
+ panic("Profile %u (used by '%s') not defined.\n",
+ profile, domain->domainname->name);
+ }
+ up_read(&tomoyo_domain_list_lock);
+ }
+}
+
+/**
+ * tomoyo_read_version: Get version.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns version information.
+ */
+static int tomoyo_read_version(struct tomoyo_io_buffer *head)
+{
+ if (!head->read_eof) {
+ tomoyo_io_printf(head, "2.2.0-pre");
+ head->read_eof = true;
+ }
+ return 0;
+}
+
+/**
+ * tomoyo_read_self_domain - Get the current process's domainname.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns the current process's domainname.
+ */
+static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
+{
+ if (!head->read_eof) {
+ /*
+ * tomoyo_domain()->domainname != NULL
+ * because every process belongs to a domain and
+ * the domain's name cannot be NULL.
+ */
+ tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
+ head->read_eof = true;
+ }
+ return 0;
+}
+
+/**
+ * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @type: Type of interface.
+ * @file: Pointer to "struct file".
+ *
+ * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
+ */
+static int tomoyo_open_control(const u8 type, struct file *file)
+{
+ struct tomoyo_io_buffer *head = tomoyo_alloc(sizeof(*head));
+
+ if (!head)
+ return -ENOMEM;
+ mutex_init(&head->io_sem);
+ switch (type) {
+ case TOMOYO_DOMAINPOLICY:
+ /* /sys/kernel/security/tomoyo/domain_policy */
+ head->write = tomoyo_write_domain_policy;
+ head->read = tomoyo_read_domain_policy;
+ break;
+ case TOMOYO_EXCEPTIONPOLICY:
+ /* /sys/kernel/security/tomoyo/exception_policy */
+ head->write = tomoyo_write_exception_policy;
+ head->read = tomoyo_read_exception_policy;
+ break;
+ case TOMOYO_SELFDOMAIN:
+ /* /sys/kernel/security/tomoyo/self_domain */
+ head->read = tomoyo_read_self_domain;
+ break;
+ case TOMOYO_DOMAIN_STATUS:
+ /* /sys/kernel/security/tomoyo/.domain_status */
+ head->write = tomoyo_write_domain_profile;
+ head->read = tomoyo_read_domain_profile;
+ break;
+ case TOMOYO_PROCESS_STATUS:
+ /* /sys/kernel/security/tomoyo/.process_status */
+ head->write = tomoyo_write_pid;
+ head->read = tomoyo_read_pid;
+ break;
+ case TOMOYO_VERSION:
+ /* /sys/kernel/security/tomoyo/version */
+ head->read = tomoyo_read_version;
+ head->readbuf_size = 128;
+ break;
+ case TOMOYO_MEMINFO:
+ /* /sys/kernel/security/tomoyo/meminfo */
+ head->write = tomoyo_write_memory_quota;
+ head->read = tomoyo_read_memory_counter;
+ head->readbuf_size = 512;
+ break;
+ case TOMOYO_PROFILE:
+ /* /sys/kernel/security/tomoyo/profile */
+ head->write = tomoyo_write_profile;
+ head->read = tomoyo_read_profile;
+ break;
+ case TOMOYO_MANAGER:
+ /* /sys/kernel/security/tomoyo/manager */
+ head->write = tomoyo_write_manager_policy;
+ head->read = tomoyo_read_manager_policy;
+ break;
+ }
+ if (!(file->f_mode & FMODE_READ)) {
+ /*
+ * No need to allocate read_buf since it is not opened
+ * for reading.
+ */
+ head->read = NULL;
+ } else {
+ if (!head->readbuf_size)
+ head->readbuf_size = 4096 * 2;
+ head->read_buf = tomoyo_alloc(head->readbuf_size);
+ if (!head->read_buf) {
+ tomoyo_free(head);
+ return -ENOMEM;
+ }
+ }
+ if (!(file->f_mode & FMODE_WRITE)) {
+ /*
+ * No need to allocate write_buf since it is not opened
+ * for writing.
+ */
+ head->write = NULL;
+ } else if (head->write) {
+ head->writebuf_size = 4096 * 2;
+ head->write_buf = tomoyo_alloc(head->writebuf_size);
+ if (!head->write_buf) {
+ tomoyo_free(head->read_buf);
+ tomoyo_free(head);
+ return -ENOMEM;
+ }
+ }
+ file->private_data = head;
+ /*
+ * Call the handler now if the file is
+ * /sys/kernel/security/tomoyo/self_domain
+ * so that the user can use
+ * cat < /sys/kernel/security/tomoyo/self_domain"
+ * to know the current process's domainname.
+ */
+ if (type == TOMOYO_SELFDOMAIN)
+ tomoyo_read_control(file, NULL, 0);
+ return 0;
+}
+
+/**
+ * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @buffer: Poiner to buffer to write to.
+ * @buffer_len: Size of @buffer.
+ *
+ * Returns bytes read on success, negative value otherwise.
+ */
+static int tomoyo_read_control(struct file *file, char __user *buffer,
+ const int buffer_len)
+{
+ int len = 0;
+ struct tomoyo_io_buffer *head = file->private_data;
+ char *cp;
+
+ if (!head->read)
+ return -ENOSYS;
+ if (mutex_lock_interruptible(&head->io_sem))
+ return -EINTR;
+ /* Call the policy handler. */
+ len = head->read(head);
+ if (len < 0)
+ goto out;
+ /* Write to buffer. */
+ len = head->read_avail;
+ if (len > buffer_len)
+ len = buffer_len;
+ if (!len)
+ goto out;
+ /* head->read_buf changes by some functions. */
+ cp = head->read_buf;
+ if (copy_to_user(buffer, cp, len)) {
+ len = -EFAULT;
+ goto out;
+ }
+ head->read_avail -= len;
+ memmove(cp, cp + len, head->read_avail);
+ out:
+ mutex_unlock(&head->io_sem);
+ return len;
+}
+
+/**
+ * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @buffer: Pointer to buffer to read from.
+ * @buffer_len: Size of @buffer.
+ *
+ * Returns @buffer_len on success, negative value otherwise.
+ */
+static int tomoyo_write_control(struct file *file, const char __user *buffer,
+ const int buffer_len)
+{
+ struct tomoyo_io_buffer *head = file->private_data;
+ int error = buffer_len;
+ int avail_len = buffer_len;
+ char *cp0 = head->write_buf;
+
+ if (!head->write)
+ return -ENOSYS;
+ if (!access_ok(VERIFY_READ, buffer, buffer_len))
+ return -EFAULT;
+ /* Don't allow updating policies by non manager programs. */
+ if (head->write != tomoyo_write_pid &&
+ head->write != tomoyo_write_domain_policy &&
+ !tomoyo_is_policy_manager())
+ return -EPERM;
+ if (mutex_lock_interruptible(&head->io_sem))
+ return -EINTR;
+ /* Read a line and dispatch it to the policy handler. */
+ while (avail_len > 0) {
+ char c;
+ if (head->write_avail >= head->writebuf_size - 1) {
+ error = -ENOMEM;
+ break;
+ } else if (get_user(c, buffer)) {
+ error = -EFAULT;
+ break;
+ }
+ buffer++;
+ avail_len--;
+ cp0[head->write_avail++] = c;
+ if (c != '\n')
+ continue;
+ cp0[head->write_avail - 1] = '\0';
+ head->write_avail = 0;
+ tomoyo_normalize_line(cp0);
+ head->write(head);
+ }
+ mutex_unlock(&head->io_sem);
+ return error;
+}
+
+/**
+ * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ *
+ * Releases memory and returns 0.
+ */
+static int tomoyo_close_control(struct file *file)
+{
+ struct tomoyo_io_buffer *head = file->private_data;
+
+ /* Release memory used for policy I/O. */
+ tomoyo_free(head->read_buf);
+ head->read_buf = NULL;
+ tomoyo_free(head->write_buf);
+ head->write_buf = NULL;
+ tomoyo_free(head);
+ head = NULL;
+ file->private_data = NULL;
+ return 0;
+}
+
+/**
+ * tomoyo_alloc_acl_element - Allocate permanent memory for ACL entry.
+ *
+ * @acl_type: Type of ACL entry.
+ *
+ * Returns pointer to the ACL entry on success, NULL otherwise.
+ */
+void *tomoyo_alloc_acl_element(const u8 acl_type)
+{
+ int len;
+ struct tomoyo_acl_info *ptr;
+
+ switch (acl_type) {
+ case TOMOYO_TYPE_SINGLE_PATH_ACL:
+ len = sizeof(struct tomoyo_single_path_acl_record);
+ break;
+ case TOMOYO_TYPE_DOUBLE_PATH_ACL:
+ len = sizeof(struct tomoyo_double_path_acl_record);
+ break;
+ default:
+ return NULL;
+ }
+ ptr = tomoyo_alloc_element(len);
+ if (!ptr)
+ return NULL;
+ ptr->type = acl_type;
+ return ptr;
+}
+
+/**
+ * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @inode: Pointer to "struct inode".
+ * @file: Pointer to "struct file".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_open(struct inode *inode, struct file *file)
+{
+ const int key = ((u8 *) file->f_path.dentry->d_inode->i_private)
+ - ((u8 *) NULL);
+ return tomoyo_open_control(key, file);
+}
+
+/**
+ * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @inode: Pointer to "struct inode".
+ * @file: Pointer to "struct file".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_release(struct inode *inode, struct file *file)
+{
+ return tomoyo_close_control(file);
+}
+
+/**
+ * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @buf: Pointer to buffer.
+ * @count: Size of @buf.
+ * @ppos: Unused.
+ *
+ * Returns bytes read on success, negative value otherwise.
+ */
+static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ return tomoyo_read_control(file, buf, count);
+}
+
+/**
+ * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @buf: Pointer to buffer.
+ * @count: Size of @buf.
+ * @ppos: Unused.
+ *
+ * Returns @count on success, negative value otherwise.
+ */
+static ssize_t tomoyo_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ return tomoyo_write_control(file, buf, count);
+}
+
+/* Operations for /sys/kernel/security/tomoyo/ interface. */
+static const struct file_operations tomoyo_operations = {
+ .open = tomoyo_open,
+ .release = tomoyo_release,
+ .read = tomoyo_read,
+ .write = tomoyo_write,
+};
+
+/**
+ * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
+ *
+ * @name: The name of the interface file.
+ * @mode: The permission of the interface file.
+ * @parent: The parent directory.
+ * @key: Type of interface.
+ *
+ * Returns nothing.
+ */
+static void __init tomoyo_create_entry(const char *name, const mode_t mode,
+ struct dentry *parent, const u8 key)
+{
+ securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
+ &tomoyo_operations);
+}
+
+/**
+ * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
+ *
+ * Returns 0.
+ */
+static int __init tomoyo_initerface_init(void)
+{
+ struct dentry *tomoyo_dir;
+
+ tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
+ tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
+ TOMOYO_DOMAINPOLICY);
+ tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
+ TOMOYO_EXCEPTIONPOLICY);
+ tomoyo_create_entry("self_domain", 0400, tomoyo_dir,
+ TOMOYO_SELFDOMAIN);
+ tomoyo_create_entry(".domain_status", 0600, tomoyo_dir,
+ TOMOYO_DOMAIN_STATUS);
+ tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
+ TOMOYO_PROCESS_STATUS);
+ tomoyo_create_entry("meminfo", 0600, tomoyo_dir,
+ TOMOYO_MEMINFO);
+ tomoyo_create_entry("profile", 0600, tomoyo_dir,
+ TOMOYO_PROFILE);
+ tomoyo_create_entry("manager", 0600, tomoyo_dir,
+ TOMOYO_MANAGER);
+ tomoyo_create_entry("version", 0400, tomoyo_dir,
+ TOMOYO_VERSION);
+ return 0;
+}
+
+fs_initcall(tomoyo_initerface_init);
--- /dev/null
+++ security-testing-2.6.git/security/tomoyo/common.h
@@ -0,0 +1,359 @@
+/*
+ * security/tomoyo/common.h
+ *
+ * Common functions for TOMOYO.
+ *
+ * Copyright (C) 2005-2009 NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre 2009/02/01
+ *
+ */
+
+#ifndef _SECURITY_TOMOYO_COMMON_H
+#define _SECURITY_TOMOYO_COMMON_H
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/file.h>
+#include <linux/kmod.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/list.h>
+
+struct dentry;
+struct vfsmount;
+
+/* Temporary buffer for holding pathnames. */
+struct tomoyo_page_buffer {
+ char buffer[4096];
+};
+
+/* Structure for holding a token. */
+struct tomoyo_path_info {
+ const char *name;
+ u32 hash; /* = full_name_hash(name, strlen(name)) */
+ u16 total_len; /* = strlen(name) */
+ u16 const_len; /* = tomoyo_const_part_length(name) */
+ bool is_dir; /* = tomoyo_strendswith(name, "/") */
+ bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
+ u16 depth; /* = tomoyo_path_depth(name) */
+};
+
+/*
+ * This is the max length of a token.
+ *
+ * A token consists of only ASCII printable characters.
+ * Non printable characters in a token is represented in \ooo style
+ * octal string. Thus, \ itself is represented as \\.
+ */
+#define TOMOYO_MAX_PATHNAME_LEN 4000
+
+/* Structure for holding requested pathname. */
+struct tomoyo_path_info_with_data {
+ /* Keep "head" first, for this pointer is passed to tomoyo_free(). */
+ struct tomoyo_path_info head;
+ char bariier1[16]; /* Safeguard for overrun. */
+ char body[TOMOYO_MAX_PATHNAME_LEN];
+ char barrier2[16]; /* Safeguard for overrun. */
+};
+
+/*
+ * Common header for holding ACL entries.
+ *
+ * Packing "struct tomoyo_acl_info" allows
+ * "struct tomoyo_single_path_acl_record" to embed "u16" and
+ * "struct tomoyo_double_path_acl_record" to embed "u8"
+ * without enlarging their structure size.
+ */
+struct tomoyo_acl_info {
+ struct list_head list;
+ /*
+ * Type of this ACL entry.
+ *
+ * MSB is is_deleted flag.
+ */
+ u8 type;
+} __packed;
+
+/* This ACL entry is deleted. */
+#define TOMOYO_ACL_DELETED 0x80
+
+/* Structure for domain information. */
+struct tomoyo_domain_info {
+ struct list_head list;
+ struct list_head acl_info_list;
+ /* Name of this domain. Never NULL. */
+ const struct tomoyo_path_info *domainname;
+ u8 profile; /* Profile number to use. */
+ u8 is_deleted; /* Delete flag.
+ 0 = active.
+ 1 = deleted but undeletable.
+ 255 = deleted and no longer undeletable. */
+ bool quota_warned; /* Quota warnning flag. */
+ /* DOMAIN_FLAGS_*. Use tomoyo_set_domain_flag() to modify. */
+ u8 flags;
+};
+
+/* Profile number is an integer between 0 and 255. */
+#define TOMOYO_MAX_PROFILES 256
+
+/* Ignore "allow_read" directive in exception policy. */
+#define TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ 1
+/*
+ * This domain was unable to create a new domain at tomoyo_find_next_domain()
+ * because the name of the domain to be created was too long or
+ * it could not allocate memory.
+ * More than one process continued execve() without domain transition.
+ */
+#define TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED 2
+
+/*
+ * Structure for "allow_read/write", "allow_execute", "allow_read",
+ * "allow_write", "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir",
+ * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar",
+ * "allow_truncate", "allow_symlink" and "allow_rewrite" directive.
+ */
+struct tomoyo_single_path_acl_record {
+ struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_SINGLE_PATH_ACL */
+ u16 perm;
+ /* Pointer to single pathname. */
+ const struct tomoyo_path_info *filename;
+};
+
+/* Structure for "allow_rename" and "allow_link" directive. */
+struct tomoyo_double_path_acl_record {
+ struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_DOUBLE_PATH_ACL */
+ u8 perm;
+ /* Pointer to single pathname. */
+ const struct tomoyo_path_info *filename1;
+ /* Pointer to single pathname. */
+ const struct tomoyo_path_info *filename2;
+};
+
+/* Keywords for ACLs. */
+#define TOMOYO_KEYWORD_ALIAS "alias "
+#define TOMOYO_KEYWORD_ALLOW_READ "allow_read "
+#define TOMOYO_KEYWORD_DELETE "delete "
+#define TOMOYO_KEYWORD_DENY_REWRITE "deny_rewrite "
+#define TOMOYO_KEYWORD_FILE_PATTERN "file_pattern "
+#define TOMOYO_KEYWORD_INITIALIZE_DOMAIN "initialize_domain "
+#define TOMOYO_KEYWORD_KEEP_DOMAIN "keep_domain "
+#define TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN "no_initialize_domain "
+#define TOMOYO_KEYWORD_NO_KEEP_DOMAIN "no_keep_domain "
+#define TOMOYO_KEYWORD_SELECT "select "
+#define TOMOYO_KEYWORD_UNDELETE "undelete "
+#define TOMOYO_KEYWORD_USE_PROFILE "use_profile "
+#define TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "ignore_global_allow_read"
+/* A domain definition starts with <kernel>. */
+#define TOMOYO_ROOT_NAME "<kernel>"
+#define TOMOYO_ROOT_NAME_LEN (sizeof(TOMOYO_ROOT_NAME) - 1)
+
+/* Index numbers for Access Controls. */
+#define TOMOYO_MAC_FOR_FILE 0 /* domain_policy.conf */
+#define TOMOYO_MAX_ACCEPT_ENTRY 1
+#define TOMOYO_VERBOSE 2
+#define TOMOYO_MAX_CONTROL_INDEX 3
+
+/* Structure for reading/writing policy via securityfs interfaces. */
+struct tomoyo_io_buffer {
+ int (*read) (struct tomoyo_io_buffer *);
+ int (*write) (struct tomoyo_io_buffer *);
+ /* Exclusive lock for this structure. */
+ struct mutex io_sem;
+ /* The position currently reading from. */
+ struct list_head *read_var1;
+ /* Extra variables for reading. */
+ struct list_head *read_var2;
+ /* The position currently writing to. */
+ struct tomoyo_domain_info *write_var1;
+ /* The step for reading. */
+ int read_step;
+ /* Buffer for reading. */
+ char *read_buf;
+ /* EOF flag for reading. */
+ bool read_eof;
+ /* Read domain ACL of specified PID? */
+ bool read_single_domain;
+ /* Extra variable for reading. */
+ u8 read_bit;
+ /* Bytes available for reading. */
+ int read_avail;
+ /* Size of read buffer. */
+ int readbuf_size;
+ /* Buffer for writing. */
+ char *write_buf;
+ /* Bytes available for writing. */
+ int write_avail;
+ /* Size of write buffer. */
+ int writebuf_size;
+};
+
+/* Check whether the domain has too many ACL entries to hold. */
+bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain);
+/* Transactional sprintf() for policy dump. */
+bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
+ __attribute__ ((format(printf, 2, 3)));
+/* Check whether the domainname is correct. */
+bool tomoyo_is_correct_domain(const unsigned char *domainname,
+ const char *function);
+/* Check whether the token is correct. */
+bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
+ const s8 pattern_type, const s8 end_type,
+ const char *function);
+/* Check whether the token can be a domainname. */
+bool tomoyo_is_domain_def(const unsigned char *buffer);
+/* Check whether the given filename matches the given pattern. */
+bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
+ const struct tomoyo_path_info *pattern);
+/* Read "alias" entry in exception policy. */
+bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head);
+/*
+ * Read "initialize_domain" and "no_initialize_domain" entry
+ * in exception policy.
+ */
+bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head);
+/* Read "keep_domain" and "no_keep_domain" entry in exception policy. */
+bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head);
+/* Read "file_pattern" entry in exception policy. */
+bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head);
+/* Read "allow_read" entry in exception policy. */
+bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head);
+/* Read "deny_rewrite" entry in exception policy. */
+bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head);
+/* Write domain policy violation warning message to console? */
+bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain);
+/* Convert double path operation to operation name. */
+const char *tomoyo_dp2keyword(const u8 operation);
+/* Get the last component of the given domainname. */
+const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain);
+/* Get warning message. */
+const char *tomoyo_get_msg(const bool is_enforce);
+/* Convert single path operation to operation name. */
+const char *tomoyo_sp2keyword(const u8 operation);
+/* Delete a domain. */
+int tomoyo_delete_domain(char *data);
+/* Create "alias" entry in exception policy. */
+int tomoyo_write_alias_policy(char *data, const bool is_delete);
+/*
+ * Create "initialize_domain" and "no_initialize_domain" entry
+ * in exception policy.
+ */
+int tomoyo_write_domain_initializer_policy(char *data, const bool is_not,
+ const bool is_delete);
+/* Create "keep_domain" and "no_keep_domain" entry in exception policy. */
+int tomoyo_write_domain_keeper_policy(char *data, const bool is_not,
+ const bool is_delete);
+/*
+ * Create "allow_read/write", "allow_execute", "allow_read", "allow_write",
+ * "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir",
+ * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar",
+ * "allow_truncate", "allow_symlink", "allow_rewrite", "allow_rename" and
+ * "allow_link" entry in domain policy.
+ */
+int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain,
+ const bool is_delete);
+/* Create "allow_read" entry in exception policy. */
+int tomoyo_write_globally_readable_policy(char *data, const bool is_delete);
+/* Create "deny_rewrite" entry in exception policy. */
+int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete);
+/* Create "file_pattern" entry in exception policy. */
+int tomoyo_write_pattern_policy(char *data, const bool is_delete);
+/* Find a domain by the given name. */
+struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
+/* Find or create a domain by the given name. */
+struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char *
+ domainname,
+ const u8 profile);
+/* Undelete a domain. */
+struct tomoyo_domain_info *tomoyo_undelete_domain(const char *domainname);
+/* Check mode for specified functionality. */
+unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
+ const u8 index);
+/* Allocate memory for structures. */
+void *tomoyo_alloc_acl_element(const u8 acl_type);
+/* Fill in "struct tomoyo_path_info" members. */
+void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
+/* Run policy loader when /sbin/init starts. */
+void tomoyo_load_policy(const char *filename);
+/* Change "struct tomoyo_domain_info"->flags. */
+void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain,
+ const bool is_delete, const u8 flags);
+
+/* strcmp() for "struct tomoyo_path_info" structure. */
+static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
+ const struct tomoyo_path_info *b)
+{
+ return a->hash != b->hash || strcmp(a->name, b->name);
+}
+
+/* Get type of an ACL entry. */
+static inline u8 tomoyo_acl_type1(struct tomoyo_acl_info *ptr)
+{
+ return ptr->type & ~TOMOYO_ACL_DELETED;
+}
+
+/* Get type of an ACL entry. */
+static inline u8 tomoyo_acl_type2(struct tomoyo_acl_info *ptr)
+{
+ return ptr->type;
+}
+
+/**
+ * tomoyo_is_valid - Check whether the character is a valid char.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is a valid character, false otherwise.
+ */
+static inline bool tomoyo_is_valid(const unsigned char c)
+{
+ return c > ' ' && c < 127;
+}
+
+/**
+ * tomoyo_is_invalid - Check whether the character is an invalid char.
+ *
+ * @c: The character to check.
+ *
+ * Returns true if @c is an invalid character, false otherwise.
+ */
+static inline bool tomoyo_is_invalid(const unsigned char c)
+{
+ return c && (c <= ' ' || c >= 127);
+}
+
+/* The list for "struct tomoyo_domain_info". */
+extern struct list_head tomoyo_domain_list;
+extern struct rw_semaphore tomoyo_domain_list_lock;
+
+/* Lock for domain->acl_info_list. */
+extern struct rw_semaphore tomoyo_domain_acl_info_list_lock;
+
+/* Has /sbin/init started? */
+extern bool tomoyo_policy_loaded;
+
+/* The kernel's domain. */
+extern struct tomoyo_domain_info tomoyo_kernel_domain;
+
+/**
+ * list_for_each_cookie - iterate over a list with cookie.
+ * @pos: the &struct list_head to use as a loop cursor.
+ * @cookie: the &struct list_head to use as a cookie.
+ * @head: the head for your list.
+ *
+ * Same with list_for_each() except that this primitive uses @cookie
+ * so that we can continue iteration.
+ * @cookie must be NULL when iteration starts, and @cookie will become
+ * NULL when iteration finishes.
+ */
+#define list_for_each_cookie(pos, cookie, head) \
+ for (({ if (!cookie) \
+ cookie = head; }), \
+ pos = (cookie)->next; \
+ prefetch(pos->next), pos != (head) || ((cookie) = NULL); \
+ (cookie) = pos, pos = pos->next)
+
+#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */
--
^ permalink raw reply [flat|nested] 23+ messages in thread* [TOMOYO #15 4/8] File operation restriction part.
2009-02-05 8:18 [TOMOYO #15 0/8] TOMOYO Linux Kentaro Takeda
` (2 preceding siblings ...)
2009-02-05 8:18 ` [TOMOYO #15 3/8] Common functions for TOMOYO Linux Kentaro Takeda
@ 2009-02-05 8:18 ` Kentaro Takeda
2009-02-05 8:18 ` [TOMOYO #15 5/8] Domain transition handler Kentaro Takeda
` (4 subsequent siblings)
8 siblings, 0 replies; 23+ messages in thread
From: Kentaro Takeda @ 2009-02-05 8:18 UTC (permalink / raw)
To: jmorris
Cc: linux-security-module, linux-kernel, akpm, haradats,
Kentaro Takeda, Tetsuo Handa
This file controls file related operations of TOMOYO Linux.
tomoyo/tomoyo.c calls the following six functions in this file.
Each function handles the following access types.
* tomoyo_check_file_perm
sysctl()'s "read" and "write".
* tomoyo_check_exec_perm
"execute".
* tomoyo_check_open_permission
open(2) for "read" and "write".
* tomoyo_check_1path_perm
"create", "unlink", "mkdir", "rmdir", "mkfifo",
"mksock", "mkblock", "mkchar", "truncate" and "symlink".
* tomoyo_check_2path_perm
"rename" and "unlink".
* tomoyo_check_rewrite_permission
"rewrite".
("rewrite" are operations which may lose already recorded data of a file,
i.e. open(!O_APPEND) || open(O_TRUNC) || truncate() || ftruncate())
The functions which actually checks ACLs are the following three functions.
Each function handles the following access types.
ACL directive is expressed by "allow_<access type>".
* tomoyo_check_file_acl
Open() operation and execve() operation.
("read", "write", "read/write" and "execute")
* tomoyo_check_single_write_acl
Directory modification operations with 1 pathname.
("create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock",
"mkblock", "mkchar", "truncate", "symlink" and "rewrite")
* tomoyo_check_double_write_acl
Directory modification operations with 2 pathname.
("link" and "rename")
Also, this file contains handlers of some utility directives
for file related operations.
* "allow_read": specifies globally (for all domains) readable files.
* "path_group": specifies pathname macro.
* "deny_rewrite": restricts rewrite operation.
Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
---
security/tomoyo/file.c | 1241 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1241 insertions(+)
--- /dev/null
+++ security-testing-2.6.git/security/tomoyo/file.c
@@ -0,0 +1,1241 @@
+/*
+ * security/tomoyo/file.c
+ *
+ * Implementation of the Domain-Based Mandatory Access Control.
+ *
+ * Copyright (C) 2005-2009 NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre 2009/02/01
+ *
+ */
+
+#include "common.h"
+#include "tomoyo.h"
+#include "realpath.h"
+#define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE])
+
+/* Structure for "allow_read" keyword. */
+struct tomoyo_globally_readable_file_entry {
+ struct list_head list;
+ const struct tomoyo_path_info *filename;
+ bool is_deleted;
+};
+
+/* Structure for "file_pattern" keyword. */
+struct tomoyo_pattern_entry {
+ struct list_head list;
+ const struct tomoyo_path_info *pattern;
+ bool is_deleted;
+};
+
+/* Structure for "deny_rewrite" keyword. */
+struct tomoyo_no_rewrite_entry {
+ struct list_head list;
+ const struct tomoyo_path_info *pattern;
+ bool is_deleted;
+};
+
+/* Keyword array for single path operations. */
+static const char *tomoyo_sp_keyword[TOMOYO_MAX_SINGLE_PATH_OPERATION] = {
+ [TOMOYO_TYPE_READ_WRITE_ACL] = "read/write",
+ [TOMOYO_TYPE_EXECUTE_ACL] = "execute",
+ [TOMOYO_TYPE_READ_ACL] = "read",
+ [TOMOYO_TYPE_WRITE_ACL] = "write",
+ [TOMOYO_TYPE_CREATE_ACL] = "create",
+ [TOMOYO_TYPE_UNLINK_ACL] = "unlink",
+ [TOMOYO_TYPE_MKDIR_ACL] = "mkdir",
+ [TOMOYO_TYPE_RMDIR_ACL] = "rmdir",
+ [TOMOYO_TYPE_MKFIFO_ACL] = "mkfifo",
+ [TOMOYO_TYPE_MKSOCK_ACL] = "mksock",
+ [TOMOYO_TYPE_MKBLOCK_ACL] = "mkblock",
+ [TOMOYO_TYPE_MKCHAR_ACL] = "mkchar",
+ [TOMOYO_TYPE_TRUNCATE_ACL] = "truncate",
+ [TOMOYO_TYPE_SYMLINK_ACL] = "symlink",
+ [TOMOYO_TYPE_REWRITE_ACL] = "rewrite",
+};
+
+/* Keyword array for double path operations. */
+static const char *tomoyo_dp_keyword[TOMOYO_MAX_DOUBLE_PATH_OPERATION] = {
+ [TOMOYO_TYPE_LINK_ACL] = "link",
+ [TOMOYO_TYPE_RENAME_ACL] = "rename",
+};
+
+/**
+ * tomoyo_sp2keyword - Get the name of single path operation.
+ *
+ * @operation: Type of operation.
+ *
+ * Returns the name of single path operation.
+ */
+const char *tomoyo_sp2keyword(const u8 operation)
+{
+ return (operation < TOMOYO_MAX_SINGLE_PATH_OPERATION)
+ ? tomoyo_sp_keyword[operation] : NULL;
+}
+
+/**
+ * tomoyo_dp2keyword - Get the name of double path operation.
+ *
+ * @operation: Type of operation.
+ *
+ * Returns the name of double path operation.
+ */
+const char *tomoyo_dp2keyword(const u8 operation)
+{
+ return (operation < TOMOYO_MAX_DOUBLE_PATH_OPERATION)
+ ? tomoyo_dp_keyword[operation] : NULL;
+}
+
+/**
+ * tomoyo_strendswith - Check whether the token ends with the given token.
+ *
+ * @name: The token to check.
+ * @tail: The token to find.
+ *
+ * Returns true if @name ends with @tail, false otherwise.
+ */
+static bool tomoyo_strendswith(const char *name, const char *tail)
+{
+ int len;
+
+ if (!name || !tail)
+ return false;
+ len = strlen(name) - strlen(tail);
+ return len >= 0 && !strcmp(name + len, tail);
+}
+
+/**
+ * tomoyo_get_path - Get realpath.
+ *
+ * @path: Pointer to "struct path".
+ *
+ * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
+ */
+static struct tomoyo_path_info *tomoyo_get_path(struct path *path)
+{
+ int error;
+ struct tomoyo_path_info_with_data *buf = tomoyo_alloc(sizeof(*buf));
+
+ if (!buf)
+ return NULL;
+ /* Reserve one byte for appending "/". */
+ error = tomoyo_realpath_from_path2(path, buf->body,
+ sizeof(buf->body) - 2);
+ if (!error) {
+ buf->head.name = buf->body;
+ tomoyo_fill_path_info(&buf->head);
+ return &buf->head;
+ }
+ tomoyo_free(buf);
+ return NULL;
+}
+
+/* Lock for domain->acl_info_list. */
+DECLARE_RWSEM(tomoyo_domain_acl_info_list_lock);
+
+static int tomoyo_update_double_path_acl(const u8 type, const char *filename1,
+ const char *filename2,
+ struct tomoyo_domain_info *
+ const domain, const bool is_delete);
+static int tomoyo_update_single_path_acl(const u8 type, const char *filename,
+ struct tomoyo_domain_info *
+ const domain, const bool is_delete);
+
+/* The list for "struct tomoyo_globally_readable_file_entry". */
+static LIST_HEAD(tomoyo_globally_readable_list);
+static DECLARE_RWSEM(tomoyo_globally_readable_list_lock);
+
+/**
+ * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list.
+ *
+ * @filename: Filename unconditionally permitted to open() for reading.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_update_globally_readable_entry(const char *filename,
+ const bool is_delete)
+{
+ struct tomoyo_globally_readable_file_entry *new_entry;
+ struct tomoyo_globally_readable_file_entry *ptr;
+ const struct tomoyo_path_info *saved_filename;
+ int error = -ENOMEM;
+
+ if (!tomoyo_is_correct_path(filename, 1, 0, -1, __func__))
+ return -EINVAL;
+ saved_filename = tomoyo_save_name(filename);
+ if (!saved_filename)
+ return -ENOMEM;
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_globally_readable_list_lock);
+ list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) {
+ if (ptr->filename != saved_filename)
+ continue;
+ ptr->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ new_entry = tomoyo_alloc_element(sizeof(*new_entry));
+ if (!new_entry)
+ goto out;
+ new_entry->filename = saved_filename;
+ list_add_tail(&new_entry->list, &tomoyo_globally_readable_list);
+ error = 0;
+ out:
+ up_write(&tomoyo_globally_readable_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return error;
+}
+
+/**
+ * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading.
+ *
+ * @filename: The filename to check.
+ *
+ * Returns true if any domain can open @filename for reading, false otherwise.
+ */
+static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info *
+ filename)
+{
+ struct tomoyo_globally_readable_file_entry *ptr;
+ bool found = false;
+ down_read(&tomoyo_globally_readable_list_lock);
+ list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) {
+ if (!ptr->is_deleted &&
+ tomoyo_path_matches_pattern(filename, ptr->filename)) {
+ found = true;
+ break;
+ }
+ }
+ up_read(&tomoyo_globally_readable_list_lock);
+ return found;
+}
+
+/**
+ * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list.
+ *
+ * @data: String to parse.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_write_globally_readable_policy(char *data, const bool is_delete)
+{
+ return tomoyo_update_globally_readable_entry(data, is_delete);
+}
+
+/**
+ * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head)
+{
+ struct list_head *pos;
+ bool done = true;
+
+ down_read(&tomoyo_globally_readable_list_lock);
+ list_for_each_cookie(pos, head->read_var2,
+ &tomoyo_globally_readable_list) {
+ struct tomoyo_globally_readable_file_entry *ptr;
+ ptr = list_entry(pos,
+ struct tomoyo_globally_readable_file_entry,
+ list);
+ if (ptr->is_deleted)
+ continue;
+ if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n",
+ ptr->filename->name)) {
+ done = false;
+ break;
+ }
+ }
+ up_read(&tomoyo_globally_readable_list_lock);
+ return done;
+}
+
+/* The list for "struct tomoyo_pattern_entry". */
+static LIST_HEAD(tomoyo_pattern_list);
+static DECLARE_RWSEM(tomoyo_pattern_list_lock);
+
+/**
+ * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list.
+ *
+ * @pattern: Pathname pattern.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_update_file_pattern_entry(const char *pattern,
+ const bool is_delete)
+{
+ struct tomoyo_pattern_entry *new_entry;
+ struct tomoyo_pattern_entry *ptr;
+ const struct tomoyo_path_info *saved_pattern;
+ int error = -ENOMEM;
+
+ if (!tomoyo_is_correct_path(pattern, 0, 1, 0, __func__))
+ return -EINVAL;
+ saved_pattern = tomoyo_save_name(pattern);
+ if (!saved_pattern)
+ return -ENOMEM;
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_pattern_list_lock);
+ list_for_each_entry(ptr, &tomoyo_pattern_list, list) {
+ if (saved_pattern != ptr->pattern)
+ continue;
+ ptr->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ new_entry = tomoyo_alloc_element(sizeof(*new_entry));
+ if (!new_entry)
+ goto out;
+ new_entry->pattern = saved_pattern;
+ list_add_tail(&new_entry->list, &tomoyo_pattern_list);
+ error = 0;
+ out:
+ up_write(&tomoyo_pattern_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return error;
+}
+
+/**
+ * tomoyo_get_file_pattern - Get patterned pathname.
+ *
+ * @filename: The filename to find patterned pathname.
+ *
+ * Returns pointer to pathname pattern if matched, @filename otherwise.
+ */
+static const struct tomoyo_path_info *
+tomoyo_get_file_pattern(const struct tomoyo_path_info *filename)
+{
+ struct tomoyo_pattern_entry *ptr;
+ const struct tomoyo_path_info *pattern = NULL;
+
+ down_read(&tomoyo_pattern_list_lock);
+ list_for_each_entry(ptr, &tomoyo_pattern_list, list) {
+ if (ptr->is_deleted)
+ continue;
+ if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
+ continue;
+ pattern = ptr->pattern;
+ if (tomoyo_strendswith(pattern->name, "/\\*")) {
+ /* Do nothing. Try to find the better match. */
+ } else {
+ /* This would be the better match. Use this. */
+ break;
+ }
+ }
+ up_read(&tomoyo_pattern_list_lock);
+ if (pattern)
+ filename = pattern;
+ return filename;
+}
+
+/**
+ * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list.
+ *
+ * @data: String to parse.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_write_pattern_policy(char *data, const bool is_delete)
+{
+ return tomoyo_update_file_pattern_entry(data, is_delete);
+}
+
+/**
+ * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head)
+{
+ struct list_head *pos;
+ bool done = true;
+
+ down_read(&tomoyo_pattern_list_lock);
+ list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) {
+ struct tomoyo_pattern_entry *ptr;
+ ptr = list_entry(pos, struct tomoyo_pattern_entry, list);
+ if (ptr->is_deleted)
+ continue;
+ if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN "%s\n",
+ ptr->pattern->name)) {
+ done = false;
+ break;
+ }
+ }
+ up_read(&tomoyo_pattern_list_lock);
+ return done;
+}
+
+/* The list for "struct tomoyo_no_rewrite_entry". */
+static LIST_HEAD(tomoyo_no_rewrite_list);
+static DECLARE_RWSEM(tomoyo_no_rewrite_list_lock);
+
+/**
+ * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list.
+ *
+ * @pattern: Pathname pattern that are not rewritable by default.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_update_no_rewrite_entry(const char *pattern,
+ const bool is_delete)
+{
+ struct tomoyo_no_rewrite_entry *new_entry, *ptr;
+ const struct tomoyo_path_info *saved_pattern;
+ int error = -ENOMEM;
+
+ if (!tomoyo_is_correct_path(pattern, 0, 0, 0, __func__))
+ return -EINVAL;
+ saved_pattern = tomoyo_save_name(pattern);
+ if (!saved_pattern)
+ return -ENOMEM;
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_no_rewrite_list_lock);
+ list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) {
+ if (ptr->pattern != saved_pattern)
+ continue;
+ ptr->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ new_entry = tomoyo_alloc_element(sizeof(*new_entry));
+ if (!new_entry)
+ goto out;
+ new_entry->pattern = saved_pattern;
+ list_add_tail(&new_entry->list, &tomoyo_no_rewrite_list);
+ error = 0;
+ out:
+ up_write(&tomoyo_no_rewrite_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return error;
+}
+
+/**
+ * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited.
+ *
+ * @filename: Filename to check.
+ *
+ * Returns true if @filename is specified by "deny_rewrite" directive,
+ * false otherwise.
+ */
+static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename)
+{
+ struct tomoyo_no_rewrite_entry *ptr;
+ bool found = false;
+
+ down_read(&tomoyo_no_rewrite_list_lock);
+ list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) {
+ if (ptr->is_deleted)
+ continue;
+ if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
+ continue;
+ found = true;
+ break;
+ }
+ up_read(&tomoyo_no_rewrite_list_lock);
+ return found;
+}
+
+/**
+ * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list.
+ *
+ * @data: String to parse.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete)
+{
+ return tomoyo_update_no_rewrite_entry(data, is_delete);
+}
+
+/**
+ * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head)
+{
+ struct list_head *pos;
+ bool done = true;
+
+ down_read(&tomoyo_no_rewrite_list_lock);
+ list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) {
+ struct tomoyo_no_rewrite_entry *ptr;
+ ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list);
+ if (ptr->is_deleted)
+ continue;
+ if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE "%s\n",
+ ptr->pattern->name)) {
+ done = false;
+ break;
+ }
+ }
+ up_read(&tomoyo_no_rewrite_list_lock);
+ return done;
+}
+
+/**
+ * tomoyo_update_file_acl - Update file's read/write/execute ACL.
+ *
+ * @filename: Filename.
+ * @perm: Permission (between 1 to 7).
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * This is legacy support interface for older policy syntax.
+ * Current policy syntax uses "allow_read/write" instead of "6",
+ * "allow_read" instead of "4", "allow_write" instead of "2",
+ * "allow_execute" instead of "1".
+ */
+static int tomoyo_update_file_acl(const char *filename, u8 perm,
+ struct tomoyo_domain_info * const domain,
+ const bool is_delete)
+{
+ if (perm > 7 || !perm) {
+ printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n",
+ __func__, perm, filename);
+ return -EINVAL;
+ }
+ if (filename[0] != '@' && tomoyo_strendswith(filename, "/"))
+ /*
+ * Only 'allow_mkdir' and 'allow_rmdir' are valid for
+ * directory permissions.
+ */
+ return 0;
+ if (perm & 4)
+ tomoyo_update_single_path_acl(TOMOYO_TYPE_READ_ACL, filename,
+ domain, is_delete);
+ if (perm & 2)
+ tomoyo_update_single_path_acl(TOMOYO_TYPE_WRITE_ACL, filename,
+ domain, is_delete);
+ if (perm & 1)
+ tomoyo_update_single_path_acl(TOMOYO_TYPE_EXECUTE_ACL,
+ filename, domain, is_delete);
+ return 0;
+}
+
+/**
+ * tomoyo_check_single_path_acl2 - Check permission for single path operation.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @filename: Filename to check.
+ * @perm: Permission.
+ * @may_use_pattern: True if patterned ACL is permitted.
+ *
+ * Returns 0 on success, -EPERM otherwise.
+ */
+static int tomoyo_check_single_path_acl2(const struct tomoyo_domain_info *
+ domain,
+ const struct tomoyo_path_info *
+ filename,
+ const u16 perm,
+ const bool may_use_pattern)
+{
+ struct tomoyo_acl_info *ptr;
+ int error = -EPERM;
+
+ down_read(&tomoyo_domain_acl_info_list_lock);
+ list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ struct tomoyo_single_path_acl_record *acl;
+ if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL)
+ continue;
+ acl = container_of(ptr, struct tomoyo_single_path_acl_record,
+ head);
+ if (!(acl->perm & perm))
+ continue;
+ if (may_use_pattern || !acl->filename->is_patterned) {
+ if (!tomoyo_path_matches_pattern(filename,
+ acl->filename))
+ continue;
+ } else {
+ continue;
+ }
+ error = 0;
+ break;
+ }
+ up_read(&tomoyo_domain_acl_info_list_lock);
+ return error;
+}
+
+/**
+ * tomoyo_check_file_acl - Check permission for opening files.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @filename: Filename to check.
+ * @operation: Mode ("read" or "write" or "read/write" or "execute").
+ *
+ * Returns 0 on success, -EPERM otherwise.
+ */
+static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain,
+ const struct tomoyo_path_info *filename,
+ const u8 operation)
+{
+ u16 perm = 0;
+
+ if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE))
+ return 0;
+ if (operation == 6)
+ perm = 1 << TOMOYO_TYPE_READ_WRITE_ACL;
+ else if (operation == 4)
+ perm = 1 << TOMOYO_TYPE_READ_ACL;
+ else if (operation == 2)
+ perm = 1 << TOMOYO_TYPE_WRITE_ACL;
+ else if (operation == 1)
+ perm = 1 << TOMOYO_TYPE_EXECUTE_ACL;
+ else
+ BUG();
+ return tomoyo_check_single_path_acl2(domain, filename, perm,
+ operation != 1);
+}
+
+/**
+ * tomoyo_check_file_perm2 - Check permission for opening files.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @filename: Filename to check.
+ * @perm: Mode ("read" or "write" or "read/write" or "execute").
+ * @operation: Operation name passed used for verbose mode.
+ * @mode: Access control mode.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain,
+ const struct tomoyo_path_info *filename,
+ const u8 perm, const char *operation,
+ const u8 mode)
+{
+ const bool is_enforce = (mode == 3);
+ const char *msg = "<unknown>";
+ int error = 0;
+
+ if (!filename)
+ return 0;
+ error = tomoyo_check_file_acl(domain, filename, perm);
+ if (error && perm == 4 &&
+ (domain->flags & TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ) == 0
+ && tomoyo_is_globally_readable_file(filename))
+ error = 0;
+ if (perm == 6)
+ msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_WRITE_ACL);
+ else if (perm == 4)
+ msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_ACL);
+ else if (perm == 2)
+ msg = tomoyo_sp2keyword(TOMOYO_TYPE_WRITE_ACL);
+ else if (perm == 1)
+ msg = tomoyo_sp2keyword(TOMOYO_TYPE_EXECUTE_ACL);
+ else
+ BUG();
+ if (!error)
+ return 0;
+ if (tomoyo_verbose_mode(domain))
+ printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied "
+ "for %s\n", tomoyo_get_msg(is_enforce), msg, operation,
+ filename->name, tomoyo_get_last_name(domain));
+ if (is_enforce)
+ return error;
+ if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) {
+ /* Don't use patterns for execute permission. */
+ const struct tomoyo_path_info *patterned_file = (perm != 1) ?
+ tomoyo_get_file_pattern(filename) : filename;
+ tomoyo_update_file_acl(patterned_file->name, perm,
+ domain, false);
+ }
+ return 0;
+}
+
+/**
+ * tomoyo_write_file_policy - Update file related list.
+ *
+ * @data: String to parse.
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain,
+ const bool is_delete)
+{
+ char *filename = strchr(data, ' ');
+ char *filename2;
+ unsigned int perm;
+ u8 type;
+
+ if (!filename)
+ return -EINVAL;
+ *filename++ = '\0';
+ if (sscanf(data, "%u", &perm) == 1)
+ return tomoyo_update_file_acl(filename, (u8) perm, domain,
+ is_delete);
+ if (strncmp(data, "allow_", 6))
+ goto out;
+ data += 6;
+ for (type = 0; type < TOMOYO_MAX_SINGLE_PATH_OPERATION; type++) {
+ if (strcmp(data, tomoyo_sp_keyword[type]))
+ continue;
+ return tomoyo_update_single_path_acl(type, filename,
+ domain, is_delete);
+ }
+ filename2 = strchr(filename, ' ');
+ if (!filename2)
+ goto out;
+ *filename2++ = '\0';
+ for (type = 0; type < TOMOYO_MAX_DOUBLE_PATH_OPERATION; type++) {
+ if (strcmp(data, tomoyo_dp_keyword[type]))
+ continue;
+ return tomoyo_update_double_path_acl(type, filename, filename2,
+ domain, is_delete);
+ }
+ out:
+ return -EINVAL;
+}
+
+/**
+ * tomoyo_update_single_path_acl - Update "struct tomoyo_single_path_acl_record" list.
+ *
+ * @type: Type of operation.
+ * @filename: Filename.
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_update_single_path_acl(const u8 type, const char *filename,
+ struct tomoyo_domain_info *
+ const domain, const bool is_delete)
+{
+ static const u16 rw_mask =
+ (1 << TOMOYO_TYPE_READ_ACL) | (1 << TOMOYO_TYPE_WRITE_ACL);
+ const struct tomoyo_path_info *saved_filename;
+ struct tomoyo_acl_info *ptr;
+ struct tomoyo_single_path_acl_record *acl;
+ int error = -ENOMEM;
+ const u16 perm = 1 << type;
+
+ if (!domain)
+ return -EINVAL;
+ if (!tomoyo_is_correct_path(filename, 0, 0, 0, __func__))
+ return -EINVAL;
+ saved_filename = tomoyo_save_name(filename);
+ if (!saved_filename)
+ return -ENOMEM;
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_domain_acl_info_list_lock);
+ if (is_delete)
+ goto delete;
+ list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL)
+ continue;
+ acl = container_of(ptr, struct tomoyo_single_path_acl_record,
+ head);
+ if (acl->filename != saved_filename)
+ continue;
+ /* Special case. Clear all bits if marked as deleted. */
+ if (ptr->type & TOMOYO_ACL_DELETED)
+ acl->perm = 0;
+ acl->perm |= perm;
+ if ((acl->perm & rw_mask) == rw_mask)
+ acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE_ACL;
+ else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))
+ acl->perm |= rw_mask;
+ ptr->type &= ~TOMOYO_ACL_DELETED;
+ error = 0;
+ goto out;
+ }
+ /* Not found. Append it to the tail. */
+ acl = tomoyo_alloc_acl_element(TOMOYO_TYPE_SINGLE_PATH_ACL);
+ if (!acl)
+ goto out;
+ acl->perm = perm;
+ if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL))
+ acl->perm |= rw_mask;
+ acl->filename = saved_filename;
+ list_add_tail(&acl->head.list, &domain->acl_info_list);
+ error = 0;
+ goto out;
+ delete:
+ error = -ENOENT;
+ list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL)
+ continue;
+ acl = container_of(ptr, struct tomoyo_single_path_acl_record,
+ head);
+ if (acl->filename != saved_filename)
+ continue;
+ acl->perm &= ~perm;
+ if ((acl->perm & rw_mask) != rw_mask)
+ acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE_ACL);
+ else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)))
+ acl->perm &= ~rw_mask;
+ if (!acl->perm)
+ ptr->type |= TOMOYO_ACL_DELETED;
+ error = 0;
+ break;
+ }
+ out:
+ up_write(&tomoyo_domain_acl_info_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return error;
+}
+
+/**
+ * tomoyo_update_double_path_acl - Update "struct tomoyo_double_path_acl_record" list.
+ *
+ * @type: Type of operation.
+ * @filename1: First filename.
+ * @filename2: Second filename.
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_update_double_path_acl(const u8 type, const char *filename1,
+ const char *filename2,
+ struct tomoyo_domain_info *
+ const domain, const bool is_delete)
+{
+ const struct tomoyo_path_info *saved_filename1;
+ const struct tomoyo_path_info *saved_filename2;
+ struct tomoyo_acl_info *ptr;
+ struct tomoyo_double_path_acl_record *acl;
+ int error = -ENOMEM;
+ const u8 perm = 1 << type;
+
+ if (!domain)
+ return -EINVAL;
+ if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __func__) ||
+ !tomoyo_is_correct_path(filename2, 0, 0, 0, __func__))
+ return -EINVAL;
+ saved_filename1 = tomoyo_save_name(filename1);
+ saved_filename2 = tomoyo_save_name(filename2);
+ if (!saved_filename1 || !saved_filename2)
+ return -ENOMEM;
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_domain_acl_info_list_lock);
+ if (is_delete)
+ goto delete;
+ list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL)
+ continue;
+ acl = container_of(ptr, struct tomoyo_double_path_acl_record,
+ head);
+ if (acl->filename1 != saved_filename1 ||
+ acl->filename2 != saved_filename2)
+ continue;
+ /* Special case. Clear all bits if marked as deleted. */
+ if (ptr->type & TOMOYO_ACL_DELETED)
+ acl->perm = 0;
+ acl->perm |= perm;
+ ptr->type &= ~TOMOYO_ACL_DELETED;
+ error = 0;
+ goto out;
+ }
+ /* Not found. Append it to the tail. */
+ acl = tomoyo_alloc_acl_element(TOMOYO_TYPE_DOUBLE_PATH_ACL);
+ if (!acl)
+ goto out;
+ acl->perm = perm;
+ acl->filename1 = saved_filename1;
+ acl->filename2 = saved_filename2;
+ list_add_tail(&acl->head.list, &domain->acl_info_list);
+ error = 0;
+ goto out;
+ delete:
+ error = -ENOENT;
+ list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL)
+ continue;
+ acl = container_of(ptr, struct tomoyo_double_path_acl_record,
+ head);
+ if (acl->filename1 != saved_filename1 ||
+ acl->filename2 != saved_filename2)
+ continue;
+ acl->perm &= ~perm;
+ if (!acl->perm)
+ ptr->type |= TOMOYO_ACL_DELETED;
+ error = 0;
+ break;
+ }
+ out:
+ up_write(&tomoyo_domain_acl_info_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return error;
+}
+
+/**
+ * tomoyo_check_single_path_acl - Check permission for single path operation.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @type: Type of operation.
+ * @filename: Filename to check.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_check_single_path_acl(struct tomoyo_domain_info *domain,
+ const u8 type,
+ const struct tomoyo_path_info *filename)
+{
+ if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE))
+ return 0;
+ return tomoyo_check_single_path_acl2(domain, filename, 1 << type, 1);
+}
+
+/**
+ * tomoyo_check_double_path_acl - Check permission for double path operation.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @type: Type of operation.
+ * @filename1: First filename to check.
+ * @filename2: Second filename to check.
+ *
+ * Returns 0 on success, -EPERM otherwise.
+ */
+static int tomoyo_check_double_path_acl(const struct tomoyo_domain_info *domain,
+ const u8 type,
+ const struct tomoyo_path_info *
+ filename1,
+ const struct tomoyo_path_info *
+ filename2)
+{
+ struct tomoyo_acl_info *ptr;
+ const u8 perm = 1 << type;
+ int error = -EPERM;
+
+ if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE))
+ return 0;
+ down_read(&tomoyo_domain_acl_info_list_lock);
+ list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ struct tomoyo_double_path_acl_record *acl;
+ if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL)
+ continue;
+ acl = container_of(ptr, struct tomoyo_double_path_acl_record,
+ head);
+ if (!(acl->perm & perm))
+ continue;
+ if (!tomoyo_path_matches_pattern(filename1, acl->filename1))
+ continue;
+ if (!tomoyo_path_matches_pattern(filename2, acl->filename2))
+ continue;
+ error = 0;
+ break;
+ }
+ up_read(&tomoyo_domain_acl_info_list_lock);
+ return error;
+}
+
+/**
+ * tomoyo_check_single_path_permission2 - Check permission for single path operation.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @operation: Type of operation.
+ * @filename: Filename to check.
+ * @mode: Access control mode.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_check_single_path_permission2(struct tomoyo_domain_info *
+ const domain, u8 operation,
+ const struct tomoyo_path_info *
+ filename, const u8 mode)
+{
+ const char *msg;
+ int error;
+ const bool is_enforce = (mode == 3);
+
+ if (!mode)
+ return 0;
+ next:
+ error = tomoyo_check_single_path_acl(domain, operation, filename);
+ msg = tomoyo_sp2keyword(operation);
+ if (!error)
+ goto ok;
+ if (tomoyo_verbose_mode(domain))
+ printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n",
+ tomoyo_get_msg(is_enforce), msg, filename->name,
+ tomoyo_get_last_name(domain));
+ if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) {
+ const char *name = tomoyo_get_file_pattern(filename)->name;
+ tomoyo_update_single_path_acl(operation, name, domain, false);
+ }
+ if (!is_enforce)
+ error = 0;
+ ok:
+ /*
+ * Since "allow_truncate" doesn't imply "allow_rewrite" permission,
+ * we need to check "allow_rewrite" permission if the filename is
+ * specified by "deny_rewrite" keyword.
+ */
+ if (!error && operation == TOMOYO_TYPE_TRUNCATE_ACL &&
+ tomoyo_is_no_rewrite_file(filename)) {
+ operation = TOMOYO_TYPE_REWRITE_ACL;
+ goto next;
+ }
+ return error;
+}
+
+/**
+ * tomoyo_check_file_perm - Check permission for sysctl()'s "read" and "write".
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @filename: Filename to check.
+ * @perm: Mode ("read" or "write" or "read/write").
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_check_file_perm(struct tomoyo_domain_info *domain,
+ const char *filename, const u8 perm)
+{
+ struct tomoyo_path_info name;
+ const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
+
+ if (!mode)
+ return 0;
+ name.name = filename;
+ tomoyo_fill_path_info(&name);
+ return tomoyo_check_file_perm2(domain, &name, perm, "sysctl", mode);
+}
+
+/**
+ * tomoyo_check_exec_perm - Check permission for "execute".
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @filename: Check permission for "execute".
+ * @tmp: Buffer for temporary use.
+ *
+ * Returns 0 on success, negativevalue otherwise.
+ */
+int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain,
+ const struct tomoyo_path_info *filename,
+ struct tomoyo_page_buffer *tmp)
+{
+ const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
+
+ if (!mode)
+ return 0;
+ return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode);
+}
+
+/**
+ * tomoyo_check_open_permission - Check permission for "read" and "write".
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @path: Pointer to "struct path".
+ * @flag: Flags for open().
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
+ struct path *path, const int flag)
+{
+ const u8 acc_mode = ACC_MODE(flag);
+ int error = -ENOMEM;
+ struct tomoyo_path_info *buf;
+ const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
+ const bool is_enforce = (mode == 3);
+
+ if (!mode || !path->mnt)
+ return 0;
+ if (acc_mode == 0)
+ return 0;
+ if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode))
+ /*
+ * I don't check directories here because mkdir() and rmdir()
+ * don't call me.
+ */
+ return 0;
+ buf = tomoyo_get_path(path);
+ if (!buf)
+ goto out;
+ error = 0;
+ /*
+ * If the filename is specified by "deny_rewrite" keyword,
+ * we need to check "allow_rewrite" permission when the filename is not
+ * opened for append mode or the filename is truncated at open time.
+ */
+ if ((acc_mode & MAY_WRITE) &&
+ ((flag & O_TRUNC) || !(flag & O_APPEND)) &&
+ (tomoyo_is_no_rewrite_file(buf))) {
+ error = tomoyo_check_single_path_permission2(domain,
+ TOMOYO_TYPE_REWRITE_ACL,
+ buf, mode);
+ }
+ if (!error)
+ error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open",
+ mode);
+ if (!error && (flag & O_TRUNC))
+ error = tomoyo_check_single_path_permission2(domain,
+ TOMOYO_TYPE_TRUNCATE_ACL,
+ buf, mode);
+ out:
+ tomoyo_free(buf);
+ if (!is_enforce)
+ error = 0;
+ return error;
+}
+
+/**
+ * tomoyo_check_1path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate" and "symlink".
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @operation: Type of operation.
+ * @path: Pointer to "struct path".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain,
+ const u8 operation, struct path *path)
+{
+ int error = -ENOMEM;
+ struct tomoyo_path_info *buf;
+ const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
+ const bool is_enforce = (mode == 3);
+
+ if (!mode || !path->mnt)
+ return 0;
+ buf = tomoyo_get_path(path);
+ if (!buf)
+ goto out;
+ switch (operation) {
+ case TOMOYO_TYPE_MKDIR_ACL:
+ case TOMOYO_TYPE_RMDIR_ACL:
+ if (!buf->is_dir) {
+ /*
+ * tomoyo_get_path() reserves space for appending "/."
+ */
+ strcat((char *) buf->name, "/");
+ tomoyo_fill_path_info(buf);
+ }
+ }
+ error = tomoyo_check_single_path_permission2(domain, operation, buf,
+ mode);
+ out:
+ tomoyo_free(buf);
+ if (!is_enforce)
+ error = 0;
+ return error;
+}
+
+/**
+ * tomoyo_check_rewrite_permission - Check permission for "rewrite".
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @filp: Pointer to "struct file".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain,
+ struct file *filp)
+{
+ int error = -ENOMEM;
+ const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
+ const bool is_enforce = (mode == 3);
+ struct tomoyo_path_info *buf;
+
+ if (!mode || !filp->f_path.mnt)
+ return 0;
+ buf = tomoyo_get_path(&filp->f_path);
+ if (!buf)
+ goto out;
+ if (!tomoyo_is_no_rewrite_file(buf)) {
+ error = 0;
+ goto out;
+ }
+ error = tomoyo_check_single_path_permission2(domain,
+ TOMOYO_TYPE_REWRITE_ACL,
+ buf, mode);
+ out:
+ tomoyo_free(buf);
+ if (!is_enforce)
+ error = 0;
+ return error;
+}
+
+/**
+ * tomoyo_check_2path_perm - Check permission for "rename" and "link".
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @operation: Type of operation.
+ * @path1: Pointer to "struct path".
+ * @path2: Pointer to "struct path".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_check_2path_perm(struct tomoyo_domain_info * const domain,
+ const u8 operation, struct path *path1,
+ struct path *path2)
+{
+ int error = -ENOMEM;
+ struct tomoyo_path_info *buf1, *buf2;
+ const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
+ const bool is_enforce = (mode == 3);
+ const char *msg;
+
+ if (!mode || !path1->mnt || !path2->mnt)
+ return 0;
+ buf1 = tomoyo_get_path(path1);
+ buf2 = tomoyo_get_path(path2);
+ if (!buf1 || !buf2)
+ goto out;
+ {
+ struct dentry *dentry = path1->dentry;
+ if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
+ /*
+ * tomoyo_get_path() reserves space for appending "/."
+ */
+ if (!buf1->is_dir) {
+ strcat((char *) buf1->name, "/");
+ tomoyo_fill_path_info(buf1);
+ }
+ if (!buf2->is_dir) {
+ strcat((char *) buf2->name, "/");
+ tomoyo_fill_path_info(buf2);
+ }
+ }
+ }
+ error = tomoyo_check_double_path_acl(domain, operation, buf1, buf2);
+ msg = tomoyo_dp2keyword(operation);
+ if (!error)
+ goto out;
+ if (tomoyo_verbose_mode(domain))
+ printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' "
+ "denied for %s\n", tomoyo_get_msg(is_enforce),
+ msg, buf1->name, buf2->name,
+ tomoyo_get_last_name(domain));
+ if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) {
+ const char *name1 = tomoyo_get_file_pattern(buf1)->name;
+ const char *name2 = tomoyo_get_file_pattern(buf2)->name;
+ tomoyo_update_double_path_acl(operation, name1, name2, domain,
+ false);
+ }
+ out:
+ tomoyo_free(buf1);
+ tomoyo_free(buf2);
+ if (!is_enforce)
+ error = 0;
+ return error;
+}
--
^ permalink raw reply [flat|nested] 23+ messages in thread* [TOMOYO #15 5/8] Domain transition handler.
2009-02-05 8:18 [TOMOYO #15 0/8] TOMOYO Linux Kentaro Takeda
` (3 preceding siblings ...)
2009-02-05 8:18 ` [TOMOYO #15 4/8] File operation restriction part Kentaro Takeda
@ 2009-02-05 8:18 ` Kentaro Takeda
2009-02-05 8:18 ` [TOMOYO #15 6/8] LSM adapter functions Kentaro Takeda
` (3 subsequent siblings)
8 siblings, 0 replies; 23+ messages in thread
From: Kentaro Takeda @ 2009-02-05 8:18 UTC (permalink / raw)
To: jmorris
Cc: linux-security-module, linux-kernel, akpm, haradats,
Kentaro Takeda, Tetsuo Handa
This file controls domain creation/deletion/transition.
Every process belongs to a domain in TOMOYO Linux.
Domain transition occurs when execve(2) is called
and the domain is expressed as 'process invocation history',
such as '<kernel> /sbin/init /etc/init.d/rc'.
Domain information is stored in current->cred->security field.
Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
---
security/tomoyo/domain.c | 878 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 878 insertions(+)
--- /dev/null
+++ security-testing-2.6.git/security/tomoyo/domain.c
@@ -0,0 +1,878 @@
+/*
+ * security/tomoyo/domain.c
+ *
+ * Implementation of the Domain-Based Mandatory Access Control.
+ *
+ * Copyright (C) 2005-2009 NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre 2009/02/01
+ *
+ */
+
+#include "common.h"
+#include "tomoyo.h"
+#include "realpath.h"
+#include <linux/binfmts.h>
+
+/* Variables definitions.*/
+
+/* The initial domain. */
+struct tomoyo_domain_info tomoyo_kernel_domain;
+
+/* The list for "struct tomoyo_domain_info". */
+LIST_HEAD(tomoyo_domain_list);
+DECLARE_RWSEM(tomoyo_domain_list_lock);
+
+/* Structure for "initialize_domain" and "no_initialize_domain" keyword. */
+struct tomoyo_domain_initializer_entry {
+ struct list_head list;
+ const struct tomoyo_path_info *domainname; /* This may be NULL */
+ const struct tomoyo_path_info *program;
+ bool is_deleted;
+ bool is_not; /* True if this entry is "no_initialize_domain". */
+ /* True if the domainname is tomoyo_get_last_name(). */
+ bool is_last_name;
+};
+
+/* Structure for "keep_domain" and "no_keep_domain" keyword. */
+struct tomoyo_domain_keeper_entry {
+ struct list_head list;
+ const struct tomoyo_path_info *domainname;
+ const struct tomoyo_path_info *program; /* This may be NULL */
+ bool is_deleted;
+ bool is_not; /* True if this entry is "no_keep_domain". */
+ /* True if the domainname is tomoyo_get_last_name(). */
+ bool is_last_name;
+};
+
+/* Structure for "alias" keyword. */
+struct tomoyo_alias_entry {
+ struct list_head list;
+ const struct tomoyo_path_info *original_name;
+ const struct tomoyo_path_info *aliased_name;
+ bool is_deleted;
+};
+
+/**
+ * tomoyo_set_domain_flag - Set or clear domain's attribute flags.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @is_delete: True if it is a delete request.
+ * @flags: Flags to set or clear.
+ *
+ * Returns nothing.
+ */
+void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain,
+ const bool is_delete, const u8 flags)
+{
+ /* We need to serialize because this is bitfield operation. */
+ static DEFINE_SPINLOCK(lock);
+ /***** CRITICAL SECTION START *****/
+ spin_lock(&lock);
+ if (!is_delete)
+ domain->flags |= flags;
+ else
+ domain->flags &= ~flags;
+ spin_unlock(&lock);
+ /***** CRITICAL SECTION END *****/
+}
+
+/**
+ * tomoyo_get_last_name - Get last component of a domainname.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ *
+ * Returns the last component of the domainname.
+ */
+const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain)
+{
+ const char *cp0 = domain->domainname->name;
+ const char *cp1 = strrchr(cp0, ' ');
+
+ if (cp1)
+ return cp1 + 1;
+ return cp0;
+}
+
+/* The list for "struct tomoyo_domain_initializer_entry". */
+static LIST_HEAD(tomoyo_domain_initializer_list);
+static DECLARE_RWSEM(tomoyo_domain_initializer_list_lock);
+
+/**
+ * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list.
+ *
+ * @domainname: The name of domain. May be NULL.
+ * @program: The name of program.
+ * @is_not: True if it is "no_initialize_domain" entry.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_update_domain_initializer_entry(const char *domainname,
+ const char *program,
+ const bool is_not,
+ const bool is_delete)
+{
+ struct tomoyo_domain_initializer_entry *new_entry;
+ struct tomoyo_domain_initializer_entry *ptr;
+ const struct tomoyo_path_info *saved_program;
+ const struct tomoyo_path_info *saved_domainname = NULL;
+ int error = -ENOMEM;
+ bool is_last_name = false;
+
+ if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__))
+ return -EINVAL; /* No patterns allowed. */
+ if (domainname) {
+ if (!tomoyo_is_domain_def(domainname) &&
+ tomoyo_is_correct_path(domainname, 1, -1, -1, __func__))
+ is_last_name = true;
+ else if (!tomoyo_is_correct_domain(domainname, __func__))
+ return -EINVAL;
+ saved_domainname = tomoyo_save_name(domainname);
+ if (!saved_domainname)
+ return -ENOMEM;
+ }
+ saved_program = tomoyo_save_name(program);
+ if (!saved_program)
+ return -ENOMEM;
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_domain_initializer_list_lock);
+ list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) {
+ if (ptr->is_not != is_not ||
+ ptr->domainname != saved_domainname ||
+ ptr->program != saved_program)
+ continue;
+ ptr->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ new_entry = tomoyo_alloc_element(sizeof(*new_entry));
+ if (!new_entry)
+ goto out;
+ new_entry->domainname = saved_domainname;
+ new_entry->program = saved_program;
+ new_entry->is_not = is_not;
+ new_entry->is_last_name = is_last_name;
+ list_add_tail(&new_entry->list, &tomoyo_domain_initializer_list);
+ error = 0;
+ out:
+ up_write(&tomoyo_domain_initializer_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return error;
+}
+
+/**
+ * tomoyo_read_domain_initializer_policy - Read "struct tomoyo_domain_initializer_entry" list.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head)
+{
+ struct list_head *pos;
+ bool done = true;
+
+ down_read(&tomoyo_domain_initializer_list_lock);
+ list_for_each_cookie(pos, head->read_var2,
+ &tomoyo_domain_initializer_list) {
+ const char *no;
+ const char *from = "";
+ const char *domain = "";
+ struct tomoyo_domain_initializer_entry *ptr;
+ ptr = list_entry(pos, struct tomoyo_domain_initializer_entry,
+ list);
+ if (ptr->is_deleted)
+ continue;
+ no = ptr->is_not ? "no_" : "";
+ if (ptr->domainname) {
+ from = " from ";
+ domain = ptr->domainname->name;
+ }
+ if (!tomoyo_io_printf(head,
+ "%s" TOMOYO_KEYWORD_INITIALIZE_DOMAIN
+ "%s%s%s\n", no, ptr->program->name, from,
+ domain)) {
+ done = false;
+ break;
+ }
+ }
+ up_read(&tomoyo_domain_initializer_list_lock);
+ return done;
+}
+
+/**
+ * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list.
+ *
+ * @data: String to parse.
+ * @is_not: True if it is "no_initialize_domain" entry.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_write_domain_initializer_policy(char *data, const bool is_not,
+ const bool is_delete)
+{
+ char *cp = strstr(data, " from ");
+
+ if (cp) {
+ *cp = '\0';
+ return tomoyo_update_domain_initializer_entry(cp + 6, data,
+ is_not,
+ is_delete);
+ }
+ return tomoyo_update_domain_initializer_entry(NULL, data, is_not,
+ is_delete);
+}
+
+/**
+ * tomoyo_is_domain_initializer - Check whether the given program causes domainname reinitialization.
+ *
+ * @domainname: The name of domain.
+ * @program: The name of program.
+ * @last_name: The last component of @domainname.
+ *
+ * Returns true if executing @program reinitializes domain transition,
+ * false otherwise.
+ */
+static bool tomoyo_is_domain_initializer(const struct tomoyo_path_info *
+ domainname,
+ const struct tomoyo_path_info *program,
+ const struct tomoyo_path_info *
+ last_name)
+{
+ struct tomoyo_domain_initializer_entry *ptr;
+ bool flag = false;
+
+ down_read(&tomoyo_domain_initializer_list_lock);
+ list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) {
+ if (ptr->is_deleted)
+ continue;
+ if (ptr->domainname) {
+ if (!ptr->is_last_name) {
+ if (ptr->domainname != domainname)
+ continue;
+ } else {
+ if (tomoyo_pathcmp(ptr->domainname, last_name))
+ continue;
+ }
+ }
+ if (tomoyo_pathcmp(ptr->program, program))
+ continue;
+ if (ptr->is_not) {
+ flag = false;
+ break;
+ }
+ flag = true;
+ }
+ up_read(&tomoyo_domain_initializer_list_lock);
+ return flag;
+}
+
+/* The list for "struct tomoyo_domain_keeper_entry". */
+static LIST_HEAD(tomoyo_domain_keeper_list);
+static DECLARE_RWSEM(tomoyo_domain_keeper_list_lock);
+
+/**
+ * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list.
+ *
+ * @domainname: The name of domain.
+ * @program: The name of program. May be NULL.
+ * @is_not: True if it is "no_keep_domain" entry.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_update_domain_keeper_entry(const char *domainname,
+ const char *program,
+ const bool is_not,
+ const bool is_delete)
+{
+ struct tomoyo_domain_keeper_entry *new_entry;
+ struct tomoyo_domain_keeper_entry *ptr;
+ const struct tomoyo_path_info *saved_domainname;
+ const struct tomoyo_path_info *saved_program = NULL;
+ static DEFINE_MUTEX(lock);
+ int error = -ENOMEM;
+ bool is_last_name = false;
+
+ if (!tomoyo_is_domain_def(domainname) &&
+ tomoyo_is_correct_path(domainname, 1, -1, -1, __func__))
+ is_last_name = true;
+ else if (!tomoyo_is_correct_domain(domainname, __func__))
+ return -EINVAL;
+ if (program) {
+ if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__))
+ return -EINVAL;
+ saved_program = tomoyo_save_name(program);
+ if (!saved_program)
+ return -ENOMEM;
+ }
+ saved_domainname = tomoyo_save_name(domainname);
+ if (!saved_domainname)
+ return -ENOMEM;
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_domain_keeper_list_lock);
+ list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) {
+ if (ptr->is_not != is_not ||
+ ptr->domainname != saved_domainname ||
+ ptr->program != saved_program)
+ continue;
+ ptr->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ new_entry = tomoyo_alloc_element(sizeof(*new_entry));
+ if (!new_entry)
+ goto out;
+ new_entry->domainname = saved_domainname;
+ new_entry->program = saved_program;
+ new_entry->is_not = is_not;
+ new_entry->is_last_name = is_last_name;
+ list_add_tail(&new_entry->list, &tomoyo_domain_keeper_list);
+ error = 0;
+ out:
+ up_write(&tomoyo_domain_keeper_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return error;
+}
+
+/**
+ * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list.
+ *
+ * @data: String to parse.
+ * @is_not: True if it is "no_keep_domain" entry.
+ * @is_delete: True if it is a delete request.
+ *
+ */
+int tomoyo_write_domain_keeper_policy(char *data, const bool is_not,
+ const bool is_delete)
+{
+ char *cp = strstr(data, " from ");
+
+ if (cp) {
+ *cp = '\0';
+ return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not,
+ is_delete);
+ }
+ return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete);
+}
+
+/**
+ * tomoyo_read_domain_keeper_policy - Read "struct tomoyo_domain_keeper_entry" list.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head)
+{
+ struct list_head *pos;
+ bool done = false;
+
+ down_read(&tomoyo_domain_keeper_list_lock);
+ list_for_each_cookie(pos, head->read_var2,
+ &tomoyo_domain_keeper_list) {
+ struct tomoyo_domain_keeper_entry *ptr;
+ const char *no;
+ const char *from = "";
+ const char *program = "";
+
+ ptr = list_entry(pos, struct tomoyo_domain_keeper_entry, list);
+ if (ptr->is_deleted)
+ continue;
+ no = ptr->is_not ? "no_" : "";
+ if (ptr->program) {
+ from = " from ";
+ program = ptr->program->name;
+ }
+ if (!tomoyo_io_printf(head,
+ "%s" TOMOYO_KEYWORD_KEEP_DOMAIN
+ "%s%s%s\n", no, program, from,
+ ptr->domainname->name)) {
+ done = false;
+ break;
+ }
+ }
+ up_read(&tomoyo_domain_keeper_list_lock);
+ return done;
+}
+
+/**
+ * tomoyo_is_domain_keeper - Check whether the given program causes domain transition suppression.
+ *
+ * @domainname: The name of domain.
+ * @program: The name of program.
+ * @last_name: The last component of @domainname.
+ *
+ * Returns true if executing @program supresses domain transition,
+ * false otherwise.
+ */
+static bool tomoyo_is_domain_keeper(const struct tomoyo_path_info *domainname,
+ const struct tomoyo_path_info *program,
+ const struct tomoyo_path_info *last_name)
+{
+ struct tomoyo_domain_keeper_entry *ptr;
+ bool flag = false;
+
+ down_read(&tomoyo_domain_keeper_list_lock);
+ list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) {
+ if (ptr->is_deleted)
+ continue;
+ if (!ptr->is_last_name) {
+ if (ptr->domainname != domainname)
+ continue;
+ } else {
+ if (tomoyo_pathcmp(ptr->domainname, last_name))
+ continue;
+ }
+ if (ptr->program && tomoyo_pathcmp(ptr->program, program))
+ continue;
+ if (ptr->is_not) {
+ flag = false;
+ break;
+ }
+ flag = true;
+ }
+ up_read(&tomoyo_domain_keeper_list_lock);
+ return flag;
+}
+
+/* The list for "struct tomoyo_alias_entry". */
+static LIST_HEAD(tomoyo_alias_list);
+static DECLARE_RWSEM(tomoyo_alias_list_lock);
+
+/**
+ * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list.
+ *
+ * @original_name: The original program's real name.
+ * @aliased_name: The symbolic program's symbolic link's name.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_update_alias_entry(const char *original_name,
+ const char *aliased_name,
+ const bool is_delete)
+{
+ struct tomoyo_alias_entry *new_entry;
+ struct tomoyo_alias_entry *ptr;
+ const struct tomoyo_path_info *saved_original_name;
+ const struct tomoyo_path_info *saved_aliased_name;
+ int error = -ENOMEM;
+
+ if (!tomoyo_is_correct_path(original_name, 1, -1, -1, __func__) ||
+ !tomoyo_is_correct_path(aliased_name, 1, -1, -1, __func__))
+ return -EINVAL; /* No patterns allowed. */
+ saved_original_name = tomoyo_save_name(original_name);
+ saved_aliased_name = tomoyo_save_name(aliased_name);
+ if (!saved_original_name || !saved_aliased_name)
+ return -ENOMEM;
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_alias_list_lock);
+ list_for_each_entry(ptr, &tomoyo_alias_list, list) {
+ if (ptr->original_name != saved_original_name ||
+ ptr->aliased_name != saved_aliased_name)
+ continue;
+ ptr->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ new_entry = tomoyo_alloc_element(sizeof(*new_entry));
+ if (!new_entry)
+ goto out;
+ new_entry->original_name = saved_original_name;
+ new_entry->aliased_name = saved_aliased_name;
+ list_add_tail(&new_entry->list, &tomoyo_alias_list);
+ error = 0;
+ out:
+ up_write(&tomoyo_alias_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return error;
+}
+
+/**
+ * tomoyo_read_alias_policy - Read "struct tomoyo_alias_entry" list.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head)
+{
+ struct list_head *pos;
+ bool done = true;
+
+ down_read(&tomoyo_alias_list_lock);
+ list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) {
+ struct tomoyo_alias_entry *ptr;
+
+ ptr = list_entry(pos, struct tomoyo_alias_entry, list);
+ if (ptr->is_deleted)
+ continue;
+ if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALIAS "%s %s\n",
+ ptr->original_name->name,
+ ptr->aliased_name->name)) {
+ done = false;
+ break;
+ }
+ }
+ up_read(&tomoyo_alias_list_lock);
+ return done;
+}
+
+/**
+ * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list.
+ *
+ * @data: String to parse.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_write_alias_policy(char *data, const bool is_delete)
+{
+ char *cp = strchr(data, ' ');
+
+ if (!cp)
+ return -EINVAL;
+ *cp++ = '\0';
+ return tomoyo_update_alias_entry(data, cp, is_delete);
+}
+
+/* Domain create/delete/undelete handler. */
+
+/* #define TOMOYO_DEBUG_DOMAIN_UNDELETE */
+
+/**
+ * tomoyo_delete_domain - Delete a domain.
+ *
+ * @domainname: The name of domain.
+ *
+ * Returns 0.
+ */
+int tomoyo_delete_domain(char *domainname)
+{
+ struct tomoyo_domain_info *domain;
+ struct tomoyo_path_info name;
+
+ name.name = domainname;
+ tomoyo_fill_path_info(&name);
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_domain_list_lock);
+#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
+ printk(KERN_DEBUG "tomoyo_delete_domain %s\n", domainname);
+ list_for_each_entry(domain, &tomoyo_domain_list, list) {
+ if (tomoyo_pathcmp(domain->domainname, &name))
+ continue;
+ printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted);
+ }
+#endif
+ /* Is there an active domain? */
+ list_for_each_entry(domain, &tomoyo_domain_list, list) {
+ struct tomoyo_domain_info *domain2;
+ /* Never delete tomoyo_kernel_domain */
+ if (domain == &tomoyo_kernel_domain)
+ continue;
+ if (domain->is_deleted ||
+ tomoyo_pathcmp(domain->domainname, &name))
+ continue;
+ /* Mark already deleted domains as non undeletable. */
+ list_for_each_entry(domain2, &tomoyo_domain_list, list) {
+ if (!domain2->is_deleted ||
+ tomoyo_pathcmp(domain2->domainname, &name))
+ continue;
+#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
+ if (domain2->is_deleted != 255)
+ printk(KERN_DEBUG
+ "Marked %p as non undeletable\n",
+ domain2);
+#endif
+ domain2->is_deleted = 255;
+ }
+ /* Delete and mark active domain as undeletable. */
+ domain->is_deleted = 1;
+#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
+ printk(KERN_DEBUG "Marked %p as undeletable\n", domain);
+#endif
+ break;
+ }
+ up_write(&tomoyo_domain_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return 0;
+}
+
+/**
+ * tomoyo_undelete_domain - Undelete a domain.
+ *
+ * @domainname: The name of domain.
+ *
+ * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
+ */
+struct tomoyo_domain_info *tomoyo_undelete_domain(const char *domainname)
+{
+ struct tomoyo_domain_info *domain;
+ struct tomoyo_domain_info *candidate_domain = NULL;
+ struct tomoyo_path_info name;
+
+ name.name = domainname;
+ tomoyo_fill_path_info(&name);
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_domain_list_lock);
+#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
+ printk(KERN_DEBUG "tomoyo_undelete_domain %s\n", domainname);
+ list_for_each_entry(domain, &tomoyo_domain_list, list) {
+ if (tomoyo_pathcmp(domain->domainname, &name))
+ continue;
+ printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted);
+ }
+#endif
+ list_for_each_entry(domain, &tomoyo_domain_list, list) {
+ if (tomoyo_pathcmp(&name, domain->domainname))
+ continue;
+ if (!domain->is_deleted) {
+ /* This domain is active. I can't undelete. */
+ candidate_domain = NULL;
+#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
+ printk(KERN_DEBUG "%p is active. I can't undelete.\n",
+ domain);
+#endif
+ break;
+ }
+ /* Is this domain undeletable? */
+ if (domain->is_deleted == 1)
+ candidate_domain = domain;
+ }
+ if (candidate_domain) {
+ candidate_domain->is_deleted = 0;
+#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
+ printk(KERN_DEBUG "%p was undeleted.\n", candidate_domain);
+#endif
+ }
+ up_write(&tomoyo_domain_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return candidate_domain;
+}
+
+/**
+ * tomoyo_find_or_assign_new_domain - Create a domain.
+ *
+ * @domainname: The name of domain.
+ * @profile: Profile number to assign if the domain was newly created.
+ *
+ * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
+ */
+struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char *
+ domainname,
+ const u8 profile)
+{
+ struct tomoyo_domain_info *domain = NULL;
+ const struct tomoyo_path_info *saved_domainname;
+
+ /***** EXCLUSIVE SECTION START *****/
+ down_write(&tomoyo_domain_list_lock);
+ domain = tomoyo_find_domain(domainname);
+ if (domain)
+ goto out;
+ if (!tomoyo_is_correct_domain(domainname, __func__))
+ goto out;
+ saved_domainname = tomoyo_save_name(domainname);
+ if (!saved_domainname)
+ goto out;
+ /* Can I reuse memory of deleted domain? */
+ list_for_each_entry(domain, &tomoyo_domain_list, list) {
+ struct task_struct *p;
+ struct tomoyo_acl_info *ptr;
+ bool flag;
+ if (!domain->is_deleted ||
+ domain->domainname != saved_domainname)
+ continue;
+ flag = false;
+ /***** CRITICAL SECTION START *****/
+ read_lock(&tasklist_lock);
+ for_each_process(p) {
+ if (tomoyo_real_domain(p) != domain)
+ continue;
+ flag = true;
+ break;
+ }
+ read_unlock(&tasklist_lock);
+ /***** CRITICAL SECTION END *****/
+ if (flag)
+ continue;
+#ifdef TOMOYO_DEBUG_DOMAIN_UNDELETE
+ printk(KERN_DEBUG "Reusing %p %s\n", domain,
+ domain->domainname->name);
+#endif
+ list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ ptr->type |= TOMOYO_ACL_DELETED;
+ }
+ tomoyo_set_domain_flag(domain, true, domain->flags);
+ domain->profile = profile;
+ domain->quota_warned = false;
+ mb(); /* Avoid out-of-order execution. */
+ domain->is_deleted = 0;
+ goto out;
+ }
+ /* No memory reusable. Create using new memory. */
+ domain = tomoyo_alloc_element(sizeof(*domain));
+ if (domain) {
+ INIT_LIST_HEAD(&domain->acl_info_list);
+ domain->domainname = saved_domainname;
+ domain->profile = profile;
+ list_add_tail(&domain->list, &tomoyo_domain_list);
+ }
+ out:
+ up_write(&tomoyo_domain_list_lock);
+ /***** EXCLUSIVE SECTION END *****/
+ return domain;
+}
+
+/**
+ * tomoyo_find_next_domain - Find a domain.
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ * @next_domain: Pointer to pointer to "struct tomoyo_domain_info".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_find_next_domain(struct linux_binprm *bprm,
+ struct tomoyo_domain_info **next_domain)
+{
+ /*
+ * This function assumes that the size of buffer returned by
+ * tomoyo_realpath() = TOMOYO_MAX_PATHNAME_LEN.
+ */
+ struct tomoyo_page_buffer *tmp = tomoyo_alloc(sizeof(*tmp));
+ struct tomoyo_domain_info *old_domain = tomoyo_domain();
+ struct tomoyo_domain_info *domain = NULL;
+ const char *old_domain_name = old_domain->domainname->name;
+ const char *original_name = bprm->filename;
+ char *new_domain_name = NULL;
+ char *real_program_name = NULL;
+ char *symlink_program_name = NULL;
+ const u8 mode = tomoyo_check_flags(old_domain, TOMOYO_MAC_FOR_FILE);
+ const bool is_enforce = (mode == 3);
+ int retval = -ENOMEM;
+ struct tomoyo_path_info r; /* real name */
+ struct tomoyo_path_info s; /* symlink name */
+ struct tomoyo_path_info l; /* last name */
+ static bool initialized;
+
+ if (!tmp)
+ goto out;
+
+ if (!initialized) {
+ /*
+ * Built-in initializers. This is needed because policies are
+ * not loaded until starting /sbin/init.
+ */
+ tomoyo_update_domain_initializer_entry(NULL, "/sbin/hotplug",
+ false, false);
+ tomoyo_update_domain_initializer_entry(NULL, "/sbin/modprobe",
+ false, false);
+ initialized = true;
+ }
+
+ /* Get tomoyo_realpath of program. */
+ retval = -ENOENT;
+ /* I hope tomoyo_realpath() won't fail with -ENOMEM. */
+ real_program_name = tomoyo_realpath(original_name);
+ if (!real_program_name)
+ goto out;
+ /* Get tomoyo_realpath of symbolic link. */
+ symlink_program_name = tomoyo_realpath_nofollow(original_name);
+ if (!symlink_program_name)
+ goto out;
+
+ r.name = real_program_name;
+ tomoyo_fill_path_info(&r);
+ s.name = symlink_program_name;
+ tomoyo_fill_path_info(&s);
+ l.name = tomoyo_get_last_name(old_domain);
+ tomoyo_fill_path_info(&l);
+
+ /* Check 'alias' directive. */
+ if (tomoyo_pathcmp(&r, &s)) {
+ struct tomoyo_alias_entry *ptr;
+ /* Is this program allowed to be called via symbolic links? */
+ down_read(&tomoyo_alias_list_lock);
+ list_for_each_entry(ptr, &tomoyo_alias_list, list) {
+ if (ptr->is_deleted ||
+ tomoyo_pathcmp(&r, ptr->original_name) ||
+ tomoyo_pathcmp(&s, ptr->aliased_name))
+ continue;
+ memset(real_program_name, 0, TOMOYO_MAX_PATHNAME_LEN);
+ strncpy(real_program_name, ptr->aliased_name->name,
+ TOMOYO_MAX_PATHNAME_LEN - 1);
+ tomoyo_fill_path_info(&r);
+ break;
+ }
+ up_read(&tomoyo_alias_list_lock);
+ }
+
+ /* Check execute permission. */
+ retval = tomoyo_check_exec_perm(old_domain, &r, tmp);
+ if (retval < 0)
+ goto out;
+
+ new_domain_name = tmp->buffer;
+ if (tomoyo_is_domain_initializer(old_domain->domainname, &r, &l)) {
+ /* Transit to the child of tomoyo_kernel_domain domain. */
+ snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1,
+ TOMOYO_ROOT_NAME " " "%s", real_program_name);
+ } else if (old_domain == &tomoyo_kernel_domain &&
+ !tomoyo_policy_loaded) {
+ /*
+ * Needn't to transit from kernel domain before starting
+ * /sbin/init. But transit from kernel domain if executing
+ * initializers because they might start before /sbin/init.
+ */
+ domain = old_domain;
+ } else if (tomoyo_is_domain_keeper(old_domain->domainname, &r, &l)) {
+ /* Keep current domain. */
+ domain = old_domain;
+ } else {
+ /* Normal domain transition. */
+ snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1,
+ "%s %s", old_domain_name, real_program_name);
+ }
+ if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN)
+ goto done;
+ down_read(&tomoyo_domain_list_lock);
+ domain = tomoyo_find_domain(new_domain_name);
+ up_read(&tomoyo_domain_list_lock);
+ if (domain)
+ goto done;
+ if (is_enforce)
+ goto done;
+ domain = tomoyo_find_or_assign_new_domain(new_domain_name,
+ old_domain->profile);
+ done:
+ if (domain)
+ goto out;
+ printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n",
+ new_domain_name);
+ if (is_enforce)
+ retval = -EPERM;
+ else
+ tomoyo_set_domain_flag(old_domain, false,
+ TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED);
+ out:
+ tomoyo_free(real_program_name);
+ tomoyo_free(symlink_program_name);
+ *next_domain = domain ? domain : old_domain;
+ tomoyo_free(tmp);
+ return retval;
+}
--
^ permalink raw reply [flat|nested] 23+ messages in thread* [TOMOYO #15 6/8] LSM adapter functions.
2009-02-05 8:18 [TOMOYO #15 0/8] TOMOYO Linux Kentaro Takeda
` (4 preceding siblings ...)
2009-02-05 8:18 ` [TOMOYO #15 5/8] Domain transition handler Kentaro Takeda
@ 2009-02-05 8:18 ` Kentaro Takeda
2009-02-05 17:10 ` Alexey Dobriyan
2009-02-05 8:18 ` [TOMOYO #15 7/8] Kconfig and Makefile Kentaro Takeda
` (2 subsequent siblings)
8 siblings, 1 reply; 23+ messages in thread
From: Kentaro Takeda @ 2009-02-05 8:18 UTC (permalink / raw)
To: jmorris
Cc: linux-security-module, linux-kernel, akpm, haradats,
Kentaro Takeda, Tetsuo Handa
DAC's permissions and TOMOYO's permissions are not one-to-one mapping.
Regarding DAC, there are "read", "write", "execute" permissions.
Regarding TOMOYO, there are "allow_read", "allow_write", "allow_read/write",
"allow_execute", "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir",
"allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar",
"allow_truncate", "allow_symlink", "allow_rewrite", "allow_link",
"allow_rename" permissions.
+----------------------------------+----------------------------------+
| requested operation | required TOMOYO's permission |
+----------------------------------+----------------------------------+
| sys_open(O_RDONLY) | allow_read |
+----------------------------------+----------------------------------+
| sys_open(O_WRONLY) | allow_write |
+----------------------------------+----------------------------------+
| sys_open(O_RDWR) | allow_read/write |
+----------------------------------+----------------------------------+
| open_exec() from do_execve() | allow_execute |
+----------------------------------+----------------------------------+
| open_exec() from !do_execve() | allow_read |
+----------------------------------+----------------------------------+
| sys_read() | (none) |
+----------------------------------+----------------------------------+
| sys_write() | (none) |
+----------------------------------+----------------------------------+
| sys_mmap() | (none) |
+----------------------------------+----------------------------------+
| sys_uselib() | allow_read |
+----------------------------------+----------------------------------+
| sys_open(O_CREAT) | allow_create |
+----------------------------------+----------------------------------+
| sys_open(O_TRUNC) | allow_truncate |
+----------------------------------+----------------------------------+
| sys_truncate() | allow_truncate |
+----------------------------------+----------------------------------+
| sys_ftruncate() | allow_truncate |
+----------------------------------+----------------------------------+
| sys_open() without O_APPEND | allow_rewrite |
+----------------------------------+----------------------------------+
| setfl() without O_APPEND | allow_rewrite |
+----------------------------------+----------------------------------+
| sys_sysctl() for writing | allow_write |
+----------------------------------+----------------------------------+
| sys_sysctl() for reading | allow_read |
+----------------------------------+----------------------------------+
| sys_unlink() | allow_unlink |
+----------------------------------+----------------------------------+
| sys_mknod(S_IFREG) | allow_create |
+----------------------------------+----------------------------------+
| sys_mknod(0) | allow_create |
+----------------------------------+----------------------------------+
| sys_mknod(S_IFIFO) | allow_mkfifo |
+----------------------------------+----------------------------------+
| sys_mknod(S_IFSOCK) | allow_mksock |
+----------------------------------+----------------------------------+
| sys_bind(AF_UNIX) | allow_mksock |
+----------------------------------+----------------------------------+
| sys_mknod(S_IFBLK) | allow_mkblock |
+----------------------------------+----------------------------------+
| sys_mknod(S_IFCHR) | allow_mkchar |
+----------------------------------+----------------------------------+
| sys_symlink() | allow_symlink |
+----------------------------------+----------------------------------+
| sys_mkdir() | allow_mkdir |
+----------------------------------+----------------------------------+
| sys_rmdir() | allow_rmdir |
+----------------------------------+----------------------------------+
| sys_link() | allow_link |
+----------------------------------+----------------------------------+
| sys_rename() | allow_rename |
+----------------------------------+----------------------------------+
TOMOYO requires "allow_execute" permission of a pathname passed to do_execve()
but does not require "allow_read" permission of that pathname.
Let's consider 3 patterns (statically linked, dynamically linked,
shell script). This description is to some degree simplified.
$ cat hello.c
#include <stdio.h>
int main() {
printf("Hello\n");
return 0;
}
$ cat hello.sh
#! /bin/sh
echo "Hello"
$ gcc -static -o hello-static hello.c
$ gcc -o hello-dynamic hello.c
$ chmod 755 hello.sh
Case 1 -- Executing hello-static from bash.
(1) The bash process calls fork() and the child process requests
do_execve("hello-static").
(2) The kernel checks "allow_execute hello-static" from "bash" domain.
(3) The kernel calculates "bash hello-static" as the domain to transit to.
(4) The kernel overwrites the child process by "hello-static".
(5) The child process transits to "bash hello-static" domain.
(6) The "hello-static" starts and finishes.
Case 2 -- Executing hello-dynamic from bash.
(1) The bash process calls fork() and the child process requests
do_execve("hello-dynamic").
(2) The kernel checks "allow_execute hello-dynamic" from "bash" domain.
(3) The kernel calculates "bash hello-dynamic" as the domain to transit to.
(4) The kernel checks "allow_read ld-linux.so" from "bash hello-dynamic"
domain. I think permission to access ld-linux.so should be charged
hello-dynamic program, for "hello-dynamic needs ld-linux.so" is not
a fault of bash program.
(5) The kernel overwrites the child process by "hello-dynamic".
(6) The child process transits to "bash hello-dynamic" domain.
(7) The "hello-dynamic" starts and finishes.
Case 3 -- Executing hello.sh from bash.
(1) The bash process calls fork() and the child process requests
do_execve("hello.sh").
(2) The kernel checks "allow_execute hello.sh" from "bash" domain.
(3) The kernel calculates "bash hello.sh" as the domain to transit to.
(4) The kernel checks "allow_read /bin/sh" from "bash hello.sh" domain.
I think permission to access /bin/sh should be charged hello.sh program,
for "hello.sh needs /bin/sh" is not a fault of bash program.
(5) The kernel overwrites the child process by "/bin/sh".
(6) The child process transits to "bash hello.sh" domain.
(7) The "/bin/sh" requests open("hello.sh").
(8) The kernel checks "allow_read hello.sh" from "bash hello.sh" domain.
(9) The "/bin/sh" starts and finishes.
Whether a file is interpreted as a program or not depends on an application.
The kernel cannot know whether the file is interpreted as a program or not.
Thus, TOMOYO treats "hello-static" "hello-dynamic" "ld-linux.so" "hello.sh"
"/bin/sh" equally as merely files; no distinction between executable and
non-executable. Therefore, TOMOYO doesn't check DAC's execute permission.
TOMOYO checks "allow_read" permission instead.
Calling do_execve() is a bold gesture that an old program's instance (i.e.
current process) is ready to be overwritten by a new program and is ready to
transfer control to the new program. To split purview of programs, TOMOYO
requires "allow_execute" permission of the new program against the old
program's instance and performs domain transition. If do_execve() succeeds,
the old program is no longer responsible against the consequence of the new
program's behavior. Only the new program is responsible for all consequences.
But TOMOYO doesn't require "allow_read" permission of the new program.
If TOMOYO requires "allow_read" permission of the new program, TOMOYO will
allow an attacker (who hijacked the old program's instance) to open the new
program and steal data from the new program. Requiring "allow_read" permission
will widen purview of the old program.
Not requiring "allow_read" permission of the new program against the old
program's instance is my design for reducing purview of the old program.
To be able to know whether the current process is in do_execve() or not,
I want to add in_execve flag to "task_struct".
Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
---
security/tomoyo/tomoyo.c | 293 +++++++++++++++++++++++++++++++++++++++++++++++
security/tomoyo/tomoyo.h | 106 +++++++++++++++++
2 files changed, 399 insertions(+)
--- /dev/null
+++ security-testing-2.6.git/security/tomoyo/tomoyo.c
@@ -0,0 +1,293 @@
+/*
+ * security/tomoyo/tomoyo.c
+ *
+ * LSM hooks for TOMOYO Linux.
+ *
+ * Copyright (C) 2005-2009 NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre 2009/02/01
+ *
+ */
+
+#include <linux/security.h>
+#include "common.h"
+#include "tomoyo.h"
+#include "realpath.h"
+
+static int tomoyo_cred_prepare(struct cred *new, const struct cred *old,
+ gfp_t gfp)
+{
+ /*
+ * Since "struct tomoyo_domain_info *" is a sharable pointer,
+ * we don't need to duplicate.
+ */
+ new->security = old->security;
+ return 0;
+}
+
+static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
+{
+ /*
+ * Do only if this function is called for the first time of an execve
+ * operation.
+ */
+ if (bprm->cred_prepared)
+ return 0;
+ /*
+ * Load policy if /sbin/tomoyo-init exists and /sbin/init is requested
+ * for the first time.
+ */
+ if (!tomoyo_policy_loaded)
+ tomoyo_load_policy(bprm->filename);
+ /*
+ * Tell tomoyo_bprm_check_security() is called for the first time of an
+ * execve operation.
+ */
+ bprm->cred->security = NULL;
+ return 0;
+}
+
+static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
+{
+ struct tomoyo_domain_info *domain = bprm->cred->security;
+
+ /*
+ * Execute permission is checked against pathname passed to do_execve()
+ * using current domain.
+ */
+ if (!domain) {
+ struct tomoyo_domain_info *next_domain = NULL;
+ int retval = tomoyo_find_next_domain(bprm, &next_domain);
+
+ if (!retval)
+ bprm->cred->security = next_domain;
+ return retval;
+ }
+ /*
+ * Read permission is checked against interpreters using next domain.
+ * '1' is the result of open_to_namei_flags(O_RDONLY).
+ */
+ return tomoyo_check_open_permission(domain, &bprm->file->f_path, 1);
+}
+
+#ifdef CONFIG_SYSCTL
+
+static int tomoyo_prepend(char **buffer, int *buflen, const char *str)
+{
+ int namelen = strlen(str);
+
+ if (*buflen < namelen)
+ return -ENOMEM;
+ *buflen -= namelen;
+ *buffer -= namelen;
+ memcpy(*buffer, str, namelen);
+ return 0;
+}
+
+/**
+ * tomoyo_sysctl_path - return the realpath of a ctl_table.
+ * @table: pointer to "struct ctl_table".
+ *
+ * Returns realpath(3) of the @table on success.
+ * Returns NULL on failure.
+ *
+ * This function uses tomoyo_alloc(), so the caller must call tomoyo_free()
+ * if this function didn't return NULL.
+ */
+static char *tomoyo_sysctl_path(struct ctl_table *table)
+{
+ int buflen = TOMOYO_MAX_PATHNAME_LEN;
+ char *buf = tomoyo_alloc(buflen);
+ char *end = buf + buflen;
+ int error = -ENOMEM;
+
+ if (!buf)
+ return NULL;
+
+ *--end = '\0';
+ buflen--;
+ while (table) {
+ char buf[32];
+ const char *sp = table->procname;
+
+ if (!sp) {
+ memset(buf, 0, sizeof(buf));
+ snprintf(buf, sizeof(buf) - 1, "=%d=", table->ctl_name);
+ sp = buf;
+ }
+ if (tomoyo_prepend(&end, &buflen, sp) ||
+ tomoyo_prepend(&end, &buflen, "/"))
+ goto out;
+ table = table->parent;
+ }
+ if (tomoyo_prepend(&end, &buflen, "/proc/sys"))
+ goto out;
+ error = tomoyo_encode(buf, end - buf, end);
+ out:
+ if (!error)
+ return buf;
+ tomoyo_free(buf);
+ return NULL;
+}
+
+static int tomoyo_sysctl(struct ctl_table *table, int op)
+{
+ int error;
+ char *name;
+
+ op &= MAY_READ | MAY_WRITE;
+ if (!op)
+ return 0;
+ name = tomoyo_sysctl_path(table);
+ if (!name)
+ return -ENOMEM;
+ error = tomoyo_check_file_perm(tomoyo_domain(), name, op);
+ tomoyo_free(name);
+ return error;
+}
+#endif
+
+static int tomoyo_path_truncate(struct path *path, loff_t length,
+ unsigned int time_attrs)
+{
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_TRUNCATE_ACL,
+ path);
+}
+
+static int tomoyo_path_unlink(struct path *parent, struct dentry *dentry)
+{
+ struct path path = { parent->mnt, dentry };
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_UNLINK_ACL,
+ &path);
+}
+
+static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
+ int mode)
+{
+ struct path path = { parent->mnt, dentry };
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_MKDIR_ACL,
+ &path);
+}
+
+static int tomoyo_path_rmdir(struct path *parent, struct dentry *dentry)
+{
+ struct path path = { parent->mnt, dentry };
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_RMDIR_ACL,
+ &path);
+}
+
+static int tomoyo_path_symlink(struct path *parent, struct dentry *dentry,
+ const char *old_name)
+{
+ struct path path = { parent->mnt, dentry };
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_SYMLINK_ACL,
+ &path);
+}
+
+static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry,
+ int mode, unsigned int dev)
+{
+ struct path path = { parent->mnt, dentry };
+ int type = TOMOYO_TYPE_CREATE_ACL;
+
+ switch (mode & S_IFMT) {
+ case S_IFCHR:
+ type = TOMOYO_TYPE_MKCHAR_ACL;
+ break;
+ case S_IFBLK:
+ type = TOMOYO_TYPE_MKBLOCK_ACL;
+ break;
+ case S_IFIFO:
+ type = TOMOYO_TYPE_MKFIFO_ACL;
+ break;
+ case S_IFSOCK:
+ type = TOMOYO_TYPE_MKSOCK_ACL;
+ break;
+ }
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ type, &path);
+}
+
+static int tomoyo_path_link(struct dentry *old_dentry, struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ struct path path1 = { new_dir->mnt, old_dentry };
+ struct path path2 = { new_dir->mnt, new_dentry };
+ return tomoyo_check_2path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_LINK_ACL,
+ &path1, &path2);
+}
+
+static int tomoyo_path_rename(struct path *old_parent,
+ struct dentry *old_dentry,
+ struct path *new_parent,
+ struct dentry *new_dentry)
+{
+ struct path path1 = { old_parent->mnt, old_dentry };
+ struct path path2 = { new_parent->mnt, new_dentry };
+ return tomoyo_check_2path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_RENAME_ACL,
+ &path1, &path2);
+}
+
+static int tomoyo_file_fcntl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ if (cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND))
+ return tomoyo_check_rewrite_permission(tomoyo_domain(), file);
+ return 0;
+}
+
+static int tomoyo_dentry_open(struct file *f, const struct cred *cred)
+{
+ int flags = f->f_flags;
+
+ if ((flags + 1) & O_ACCMODE)
+ flags++;
+ flags |= f->f_flags & (O_APPEND | O_TRUNC);
+ /* Don't check read permission here if called from do_execve(). */
+ if (current->in_execve)
+ return 0;
+ return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags);
+}
+
+static struct security_operations tomoyo_security_ops = {
+ .name = "tomoyo",
+ .cred_prepare = tomoyo_cred_prepare,
+ .bprm_set_creds = tomoyo_bprm_set_creds,
+ .bprm_check_security = tomoyo_bprm_check_security,
+#ifdef CONFIG_SYSCTL
+ .sysctl = tomoyo_sysctl,
+#endif
+ .file_fcntl = tomoyo_file_fcntl,
+ .dentry_open = tomoyo_dentry_open,
+ .path_truncate = tomoyo_path_truncate,
+ .path_unlink = tomoyo_path_unlink,
+ .path_mkdir = tomoyo_path_mkdir,
+ .path_rmdir = tomoyo_path_rmdir,
+ .path_symlink = tomoyo_path_symlink,
+ .path_mknod = tomoyo_path_mknod,
+ .path_link = tomoyo_path_link,
+ .path_rename = tomoyo_path_rename,
+};
+
+static int __init tomoyo_init(void)
+{
+ struct cred *cred = (struct cred *) current_cred();
+
+ if (!security_module_enable(&tomoyo_security_ops))
+ return 0;
+ /* register ourselves with the security framework */
+ if (register_security(&tomoyo_security_ops))
+ panic("Failure registering TOMOYO Linux");
+ printk(KERN_INFO "TOMOYO Linux initialized\n");
+ cred->security = &tomoyo_kernel_domain;
+ return 0;
+}
+
+security_initcall(tomoyo_init);
--- /dev/null
+++ security-testing-2.6.git/security/tomoyo/tomoyo.h
@@ -0,0 +1,106 @@
+/*
+ * security/tomoyo/tomoyo.h
+ *
+ * Implementation of the Domain-Based Mandatory Access Control.
+ *
+ * Copyright (C) 2005-2009 NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre 2009/02/01
+ *
+ */
+
+#ifndef _SECURITY_TOMOYO_TOMOYO_H
+#define _SECURITY_TOMOYO_TOMOYO_H
+
+struct tomoyo_path_info;
+struct path;
+struct inode;
+struct linux_binprm;
+struct pt_regs;
+struct tomoyo_page_buffer;
+
+int tomoyo_check_file_perm(struct tomoyo_domain_info *domain,
+ const char *filename, const u8 perm);
+int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain,
+ const struct tomoyo_path_info *filename,
+ struct tomoyo_page_buffer *buf);
+int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
+ struct path *path, const int flag);
+int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain,
+ const u8 operation, struct path *path);
+int tomoyo_check_2path_perm(struct tomoyo_domain_info *domain,
+ const u8 operation, struct path *path1,
+ struct path *path2);
+int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain,
+ struct file *filp);
+int tomoyo_find_next_domain(struct linux_binprm *bprm,
+ struct tomoyo_domain_info **next_domain);
+
+/* Index numbers for Access Controls. */
+
+#define TOMOYO_TYPE_SINGLE_PATH_ACL 0
+#define TOMOYO_TYPE_DOUBLE_PATH_ACL 1
+
+/* Index numbers for File Controls. */
+
+/*
+ * TYPE_READ_WRITE_ACL is special. TYPE_READ_WRITE_ACL is automatically set
+ * if both TYPE_READ_ACL and TYPE_WRITE_ACL are set. Both TYPE_READ_ACL and
+ * TYPE_WRITE_ACL are automatically set if TYPE_READ_WRITE_ACL is set.
+ * TYPE_READ_WRITE_ACL is automatically cleared if either TYPE_READ_ACL or
+ * TYPE_WRITE_ACL is cleared. Both TYPE_READ_ACL and TYPE_WRITE_ACL are
+ * automatically cleared if TYPE_READ_WRITE_ACL is cleared.
+ */
+
+#define TOMOYO_TYPE_READ_WRITE_ACL 0
+#define TOMOYO_TYPE_EXECUTE_ACL 1
+#define TOMOYO_TYPE_READ_ACL 2
+#define TOMOYO_TYPE_WRITE_ACL 3
+#define TOMOYO_TYPE_CREATE_ACL 4
+#define TOMOYO_TYPE_UNLINK_ACL 5
+#define TOMOYO_TYPE_MKDIR_ACL 6
+#define TOMOYO_TYPE_RMDIR_ACL 7
+#define TOMOYO_TYPE_MKFIFO_ACL 8
+#define TOMOYO_TYPE_MKSOCK_ACL 9
+#define TOMOYO_TYPE_MKBLOCK_ACL 10
+#define TOMOYO_TYPE_MKCHAR_ACL 11
+#define TOMOYO_TYPE_TRUNCATE_ACL 12
+#define TOMOYO_TYPE_SYMLINK_ACL 13
+#define TOMOYO_TYPE_REWRITE_ACL 14
+#define TOMOYO_MAX_SINGLE_PATH_OPERATION 15
+
+#define TOMOYO_TYPE_LINK_ACL 0
+#define TOMOYO_TYPE_RENAME_ACL 1
+#define TOMOYO_MAX_DOUBLE_PATH_OPERATION 2
+
+#define TOMOYO_DOMAINPOLICY 0
+#define TOMOYO_EXCEPTIONPOLICY 1
+#define TOMOYO_DOMAIN_STATUS 2
+#define TOMOYO_PROCESS_STATUS 3
+#define TOMOYO_MEMINFO 4
+#define TOMOYO_SELFDOMAIN 5
+#define TOMOYO_VERSION 6
+#define TOMOYO_PROFILE 7
+#define TOMOYO_MANAGER 8
+
+extern struct tomoyo_domain_info tomoyo_kernel_domain;
+
+static inline struct tomoyo_domain_info *tomoyo_domain(void)
+{
+ return current_cred()->security;
+}
+
+/* Caller holds tasklist_lock spinlock. */
+static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
+ *task)
+{
+ /***** CRITICAL SECTION START *****/
+ const struct cred *cred = get_task_cred(task);
+ struct tomoyo_domain_info *domain = cred->security;
+
+ put_cred(cred);
+ return domain;
+ /***** CRITICAL SECTION END *****/
+}
+
+#endif /* !defined(_SECURITY_TOMOYO_TOMOYO_H) */
--
^ permalink raw reply [flat|nested] 23+ messages in thread* Re: [TOMOYO #15 6/8] LSM adapter functions.
2009-02-05 8:18 ` [TOMOYO #15 6/8] LSM adapter functions Kentaro Takeda
@ 2009-02-05 17:10 ` Alexey Dobriyan
2009-02-06 1:41 ` Tetsuo Handa
0 siblings, 1 reply; 23+ messages in thread
From: Alexey Dobriyan @ 2009-02-05 17:10 UTC (permalink / raw)
To: Kentaro Takeda
Cc: jmorris, linux-security-module, linux-kernel, akpm, haradats,
Tetsuo Handa
On Thu, Feb 05, 2009 at 05:18:16PM +0900, Kentaro Takeda wrote:
> +/**
> + * tomoyo_sysctl_path - return the realpath of a ctl_table.
> + * @table: pointer to "struct ctl_table".
> + *
> + * Returns realpath(3) of the @table on success.
> + * Returns NULL on failure.
> + *
> + * This function uses tomoyo_alloc(), so the caller must call tomoyo_free()
> + * if this function didn't return NULL.
> + */
> +static char *tomoyo_sysctl_path(struct ctl_table *table)
> +{
> + int buflen = TOMOYO_MAX_PATHNAME_LEN;
> + char *buf = tomoyo_alloc(buflen);
> + char *end = buf + buflen;
> + int error = -ENOMEM;
> +
> + if (!buf)
> + return NULL;
> +
> + *--end = '\0';
> + buflen--;
> + while (table) {
> + char buf[32];
> + const char *sp = table->procname;
> +
> + if (!sp) {
> + memset(buf, 0, sizeof(buf));
> + snprintf(buf, sizeof(buf) - 1, "=%d=", table->ctl_name);
> + sp = buf;
> + }
> + if (tomoyo_prepend(&end, &buflen, sp) ||
> + tomoyo_prepend(&end, &buflen, "/"))
> + goto out;
> + table = table->parent;
> + }
> + if (tomoyo_prepend(&end, &buflen, "/proc/sys"))
Hardcoded path?
> + goto out;
> + error = tomoyo_encode(buf, end - buf, end);
> + out:
> + if (!error)
> + return buf;
> + tomoyo_free(buf);
> + return NULL;
> +}
^ permalink raw reply [flat|nested] 23+ messages in thread* Re: [TOMOYO #15 6/8] LSM adapter functions.
2009-02-05 17:10 ` Alexey Dobriyan
@ 2009-02-06 1:41 ` Tetsuo Handa
0 siblings, 0 replies; 23+ messages in thread
From: Tetsuo Handa @ 2009-02-06 1:41 UTC (permalink / raw)
To: adobriyan
Cc: jmorris, linux-security-module, linux-kernel, akpm, haradats,
takedakn
Alexey Dobriyan wrote:
> > + if (tomoyo_prepend(&end, &buflen, "/proc/sys"))
>
> Hardcoded path?
>
Yes.
The sysctl's table tree is accessible via sys/ directory of proc filesystem.
Since this function is called by sysctl(2), we don't have a mount point.
On the assumption that proc filesystem is mounted on /proc/ , TOMOYO pretends
as if corresponding sysctl table entry under sys/ directory of proc filesystem
is accessed.
Regards.
^ permalink raw reply [flat|nested] 23+ messages in thread
* [TOMOYO #15 7/8] Kconfig and Makefile
2009-02-05 8:18 [TOMOYO #15 0/8] TOMOYO Linux Kentaro Takeda
` (5 preceding siblings ...)
2009-02-05 8:18 ` [TOMOYO #15 6/8] LSM adapter functions Kentaro Takeda
@ 2009-02-05 8:18 ` Kentaro Takeda
2009-02-05 8:18 ` [TOMOYO #15 8/8] MAINTAINERS info Kentaro Takeda
2009-02-12 5:34 ` [TOMOYO #15 0/8] TOMOYO Linux James Morris
8 siblings, 0 replies; 23+ messages in thread
From: Kentaro Takeda @ 2009-02-05 8:18 UTC (permalink / raw)
To: jmorris
Cc: linux-security-module, linux-kernel, akpm, haradats,
Kentaro Takeda, Tetsuo Handa
TOMOYO uses LSM hooks for pathname based access control and securityfs support.
Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
---
security/Kconfig | 1 +
security/Makefile | 2 ++
security/tomoyo/Kconfig | 11 +++++++++++
security/tomoyo/Makefile | 1 +
4 files changed, 15 insertions(+)
--- security-testing-2.6.git.orig/security/Kconfig
+++ security-testing-2.6.git/security/Kconfig
@@ -134,6 +134,7 @@ config SECURITY_DEFAULT_MMAP_MIN_ADDR
source security/selinux/Kconfig
source security/smack/Kconfig
+source security/tomoyo/Kconfig
endmenu
--- security-testing-2.6.git.orig/security/Makefile
+++ security-testing-2.6.git/security/Makefile
@@ -5,6 +5,7 @@
obj-$(CONFIG_KEYS) += keys/
subdir-$(CONFIG_SECURITY_SELINUX) += selinux
subdir-$(CONFIG_SECURITY_SMACK) += smack
+subdir-$(CONFIG_SECURITY_TOMOYO) += tomoyo
# always enable default capabilities
obj-y += commoncap.o
@@ -17,3 +18,4 @@ obj-$(CONFIG_SECURITY_SELINUX) += selin
obj-$(CONFIG_SECURITY_SMACK) += smack/built-in.o
obj-$(CONFIG_SECURITY_ROOTPLUG) += root_plug.o
obj-$(CONFIG_CGROUP_DEVICE) += device_cgroup.o
+obj-$(CONFIG_SECURITY_TOMOYO) += tomoyo/built-in.o
--- /dev/null
+++ security-testing-2.6.git/security/tomoyo/Kconfig
@@ -0,0 +1,11 @@
+config SECURITY_TOMOYO
+ bool "TOMOYO Linux Support"
+ depends on SECURITY
+ select SECURITYFS
+ select SECURITY_PATH
+ default n
+ help
+ This selects TOMOYO Linux, pathname-based access control.
+ Required userspace tools and further information may be
+ found at <http://tomoyo.sourceforge.jp/>.
+ If you are unsure how to answer this question, answer N.
--- /dev/null
+++ security-testing-2.6.git/security/tomoyo/Makefile
@@ -0,0 +1 @@
+obj-y = common.o realpath.o tomoyo.o domain.o file.o
--
^ permalink raw reply [flat|nested] 23+ messages in thread* [TOMOYO #15 8/8] MAINTAINERS info
2009-02-05 8:18 [TOMOYO #15 0/8] TOMOYO Linux Kentaro Takeda
` (6 preceding siblings ...)
2009-02-05 8:18 ` [TOMOYO #15 7/8] Kconfig and Makefile Kentaro Takeda
@ 2009-02-05 8:18 ` Kentaro Takeda
2009-02-12 5:34 ` [TOMOYO #15 0/8] TOMOYO Linux James Morris
8 siblings, 0 replies; 23+ messages in thread
From: Kentaro Takeda @ 2009-02-05 8:18 UTC (permalink / raw)
To: jmorris; +Cc: linux-security-module, linux-kernel, akpm, haradats,
Kentaro Takeda
The archive of tomoyo-users-en mailing list is available at
http://lists.sourceforge.jp/mailman/archives/tomoyo-users-en/ .
Mailing lists for Japanese users are at
http://lists.sourceforge.jp/mailman/archives/tomoyo-users/ and
http://lists.sourceforge.jp/mailman/archives/tomoyo-dev/ .
TOMOYO Linux English portal is at
http://elinux.org/TomoyoLinux .
Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
---
MAINTAINERS | 13 +++++++++++++
1 file changed, 13 insertions(+)
--- security-testing-2.6.git.orig/MAINTAINERS
+++ security-testing-2.6.git/MAINTAINERS
@@ -4257,6 +4257,19 @@ L: tlan-devel@lists.sourceforge.net (sub
W: http://sourceforge.net/projects/tlan/
S: Maintained
+TOMOYO SECURITY MODULE
+P: Kentaro Takeda
+M: takedakn@nttdata.co.jp
+P: Tetsuo Handa
+M: penguin-kernel@I-love.SAKURA.ne.jp
+L: linux-kernel@vger.kernel.org (kernel issues)
+L: tomoyo-users-en@lists.sourceforge.jp (subscribers-only, for developers and users in English)
+L: tomoyo-dev@lists.sourceforge.jp (subscribers-only, for developers in Japanese)
+L: tomoyo-users@lists.sourceforge.jp (subscribers-only, for users in Japanese)
+W: http://tomoyo.sourceforge.jp/
+T: quilt http://svn.sourceforge.jp/svnroot/tomoyo/trunk/2.2.x/tomoyo-lsm/patches/
+S: Maintained
+
TOSHIBA ACPI EXTRAS DRIVER
P: John Belmonte
M: toshiba_acpi@memebeam.org
--
^ permalink raw reply [flat|nested] 23+ messages in thread* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-05 8:18 [TOMOYO #15 0/8] TOMOYO Linux Kentaro Takeda
` (7 preceding siblings ...)
2009-02-05 8:18 ` [TOMOYO #15 8/8] MAINTAINERS info Kentaro Takeda
@ 2009-02-12 5:34 ` James Morris
2009-02-12 6:53 ` Tetsuo Handa
2009-02-22 14:23 ` Pavel Machek
8 siblings, 2 replies; 23+ messages in thread
From: James Morris @ 2009-02-12 5:34 UTC (permalink / raw)
To: Kentaro Takeda; +Cc: linux-security-module, linux-kernel, akpm, haradats
On Thu, 5 Feb 2009, Kentaro Takeda wrote:
> TOMOYO Linux is a name-based MAC extension (LSM module) for the Linux kernel.
>
Applied to
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next
Please fix the following issue detected by sparse:
$ make C=2 SUBDIRS=security/tomoyo CF="-D__cold__="
CHECK security/tomoyo/common.c
CHECK security/tomoyo/realpath.c
CHECK security/tomoyo/tomoyo.c
security/tomoyo/tomoyo.c:110:8: warning: symbol 'buf' shadows an earlier one
security/tomoyo/tomoyo.c:100:7: originally declared here
The fix is not obvious. You should be running sparse, too.
I also fixed up the link order so security=tomoyo works when root_plug is
enabled.
- James
--
James Morris
<jmorris@namei.org>
^ permalink raw reply [flat|nested] 23+ messages in thread* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-12 5:34 ` [TOMOYO #15 0/8] TOMOYO Linux James Morris
@ 2009-02-12 6:53 ` Tetsuo Handa
2009-02-12 9:25 ` James Morris
2009-02-22 14:23 ` Pavel Machek
1 sibling, 1 reply; 23+ messages in thread
From: Tetsuo Handa @ 2009-02-12 6:53 UTC (permalink / raw)
To: jmorris; +Cc: linux-security-module, linux-kernel, akpm, haradats, takedakn
James Morris wrote:
> Applied to
> git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next
Thank you.
> Please fix the following issue detected by sparse:
Oh, sorry.
What can I do next?
----------
Subject: TOMOYO: Fix sparse warning.
Fix sparse warning.
$ make C=2 SUBDIRS=security/tomoyo CF="-D__cold__="
CHECK security/tomoyo/common.c
CHECK security/tomoyo/realpath.c
CHECK security/tomoyo/tomoyo.c
security/tomoyo/tomoyo.c:110:8: warning: symbol 'buf' shadows an earlier one
security/tomoyo/tomoyo.c:100:7: originally declared here
Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
---
security/tomoyo/tomoyo.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- security-testing-2.6.git.orig/security/tomoyo/tomoyo.c
+++ security-testing-2.6.git/security/tomoyo/tomoyo.c
@@ -107,13 +107,13 @@ static char *tomoyo_sysctl_path(struct c
*--end = '\0';
buflen--;
while (table) {
- char buf[32];
+ char num[32];
const char *sp = table->procname;
if (!sp) {
- memset(buf, 0, sizeof(buf));
- snprintf(buf, sizeof(buf) - 1, "=%d=", table->ctl_name);
- sp = buf;
+ memset(num, 0, sizeof(num));
+ snprintf(num, sizeof(num) - 1, "=%d=", table->ctl_name);
+ sp = num;
}
if (tomoyo_prepend(&end, &buflen, sp) ||
tomoyo_prepend(&end, &buflen, "/"))
^ permalink raw reply [flat|nested] 23+ messages in thread* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-12 6:53 ` Tetsuo Handa
@ 2009-02-12 9:25 ` James Morris
2009-02-13 7:00 ` Tetsuo Handa
0 siblings, 1 reply; 23+ messages in thread
From: James Morris @ 2009-02-12 9:25 UTC (permalink / raw)
To: Tetsuo Handa
Cc: linux-security-module, linux-kernel, akpm, haradats, takedakn
On Thu, 12 Feb 2009, Tetsuo Handa wrote:
> James Morris wrote:
> > Applied to
> > git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next
> Thank you.
>
> > Please fix the following issue detected by sparse:
> Oh, sorry.
>
> What can I do next?
Testing after merges with Linus would be useful.
> ----------
> Subject: TOMOYO: Fix sparse warning.
>
Applied.
--
James Morris
<jmorris@namei.org>
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-12 9:25 ` James Morris
@ 2009-02-13 7:00 ` Tetsuo Handa
2009-02-14 1:33 ` James Morris
0 siblings, 1 reply; 23+ messages in thread
From: Tetsuo Handa @ 2009-02-13 7:00 UTC (permalink / raw)
To: jmorris; +Cc: linux-security-module, linux-kernel, akpm, haradats, takedakn
Hello.
I made a mistake when converting to use standard doubly linked list.
Please apply this patch.
----------
Subject: TOMOYO: Fix exception policy read failure.
Due to wrong initialization, "cat /sys/kernel/security/tomoyo/exception_policy"
returned nothing.
Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
---
security/tomoyo/domain.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- security-testing-2.6.git.orig/security/tomoyo/domain.c
+++ security-testing-2.6.git/security/tomoyo/domain.c
@@ -376,7 +376,7 @@ int tomoyo_write_domain_keeper_policy(ch
bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head)
{
struct list_head *pos;
- bool done = false;
+ bool done = true;
down_read(&tomoyo_domain_keeper_list_lock);
list_for_each_cookie(pos, head->read_var2,
^ permalink raw reply [flat|nested] 23+ messages in thread* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-13 7:00 ` Tetsuo Handa
@ 2009-02-14 1:33 ` James Morris
0 siblings, 0 replies; 23+ messages in thread
From: James Morris @ 2009-02-14 1:33 UTC (permalink / raw)
To: Tetsuo Handa
Cc: linux-security-module, linux-kernel, akpm, haradats, takedakn
On Fri, 13 Feb 2009, Tetsuo Handa wrote:
> Hello.
>
> I made a mistake when converting to use standard doubly linked list.
> Please apply this patch.
> ----------
> Subject: TOMOYO: Fix exception policy read failure.
>
> Due to wrong initialization, "cat /sys/kernel/security/tomoyo/exception_policy"
> returned nothing.
>
> Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
Applied.
> ---
> security/tomoyo/domain.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- security-testing-2.6.git.orig/security/tomoyo/domain.c
> +++ security-testing-2.6.git/security/tomoyo/domain.c
> @@ -376,7 +376,7 @@ int tomoyo_write_domain_keeper_policy(ch
> bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head)
> {
> struct list_head *pos;
> - bool done = false;
> + bool done = true;
>
> down_read(&tomoyo_domain_keeper_list_lock);
> list_for_each_cookie(pos, head->read_var2,
>
--
James Morris
<jmorris@namei.org>
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-12 5:34 ` [TOMOYO #15 0/8] TOMOYO Linux James Morris
2009-02-12 6:53 ` Tetsuo Handa
@ 2009-02-22 14:23 ` Pavel Machek
2009-02-22 14:27 ` Tetsuo Handa
1 sibling, 1 reply; 23+ messages in thread
From: Pavel Machek @ 2009-02-22 14:23 UTC (permalink / raw)
To: James Morris
Cc: Kentaro Takeda, linux-security-module, linux-kernel, akpm,
haradats
On Thu 2009-02-12 16:34:16, James Morris wrote:
> On Thu, 5 Feb 2009, Kentaro Takeda wrote:
>
> > TOMOYO Linux is a name-based MAC extension (LSM module) for the Linux kernel.
> >
>
> Applied to
> git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next
>
Does that mean tomoyo is scheduled for 2.6.30?
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-22 14:23 ` Pavel Machek
@ 2009-02-22 14:27 ` Tetsuo Handa
2009-02-22 14:48 ` Pavel Machek
0 siblings, 1 reply; 23+ messages in thread
From: Tetsuo Handa @ 2009-02-22 14:27 UTC (permalink / raw)
To: pavel, jmorris
Cc: takedakn, linux-security-module, linux-kernel, akpm, haradats
Pavel Machek wrote:
> On Thu 2009-02-12 16:34:16, James Morris wrote:
> > On Thu, 5 Feb 2009, Kentaro Takeda wrote:
> >
> > > TOMOYO Linux is a name-based MAC extension (LSM module) for the Linux kernel.
> > >
> >
> > Applied to
> > git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next
> >
>
> Does that mean tomoyo is scheduled for 2.6.30?
>
TOMOYO is already in linux-next tree and ready to go into 2.6.30 .
Regards.
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-22 14:27 ` Tetsuo Handa
@ 2009-02-22 14:48 ` Pavel Machek
2009-02-23 7:37 ` Toshiharu Harada
0 siblings, 1 reply; 23+ messages in thread
From: Pavel Machek @ 2009-02-22 14:48 UTC (permalink / raw)
To: Tetsuo Handa
Cc: jmorris, takedakn, linux-security-module, linux-kernel, akpm,
haradats
On Sun 2009-02-22 23:27:34, Tetsuo Handa wrote:
> Pavel Machek wrote:
> > On Thu 2009-02-12 16:34:16, James Morris wrote:
> > > On Thu, 5 Feb 2009, Kentaro Takeda wrote:
> > >
> > > > TOMOYO Linux is a name-based MAC extension (LSM module) for the Linux kernel.
> > > >
> > >
> > > Applied to
> > > git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next
> > >
> >
> > Does that mean tomoyo is scheduled for 2.6.30?
> >
> TOMOYO is already in linux-next tree and ready to go into 2.6.30 .
Last time I looked it included script parser and some
interpretter... Was that solved?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-22 14:48 ` Pavel Machek
@ 2009-02-23 7:37 ` Toshiharu Harada
2009-02-25 19:46 ` Pavel Machek
0 siblings, 1 reply; 23+ messages in thread
From: Toshiharu Harada @ 2009-02-23 7:37 UTC (permalink / raw)
To: Pavel Machek
Cc: Tetsuo Handa, jmorris, takedakn, linux-security-module,
linux-kernel, akpm
Pavel Machek wrote:
> On Sun 2009-02-22 23:27:34, Tetsuo Handa wrote:
>> Pavel Machek wrote:
>>> On Thu 2009-02-12 16:34:16, James Morris wrote:
>>>> On Thu, 5 Feb 2009, Kentaro Takeda wrote:
>>>>
>>>>> TOMOYO Linux is a name-based MAC extension (LSM module) for the Linux kernel.
>>>>>
>>>> Applied to
>>>> git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next
>>>>
>>> Does that mean tomoyo is scheduled for 2.6.30?
>>>
>> TOMOYO is already in linux-next tree and ready to go into 2.6.30 .
>
> Last time I looked it included script parser and some
> interpretter... Was that solved?
> Pavel
Are you talking about the interface between
userland and kernel regarding string data?
Linus once said in a Smack thread (http://lkml.org/lkml/2007/11/5/129)
>> On Sun, Nov 04, 2007 at 12:28:48PM +0000, Pavel Machek wrote:
>> > Can we avoid string parsers in the kernel?
>>
>> Ok, Could someone suggest a better idea please ?.
>
> I personally think string parsers are *much* better than the alternatives
> (which basically boil down to nasty binary interfaces)
>
>> I thought about packing the rules in a structure and sending
>> it over an ioctl() command. Is this applicable ?
>
> That's *MUCH* worse.
>
> Strings are nice. They aren't that complex, and as long as it's not a
> performance-critical area, there are basically no downsides.
>
> Binary structures and ioctl's are *much* worse. They are totally
> undebuggable with generic tools (think "echo" or "strace"), and they are a
> total nightmare to parse across architectures and pointer sizes.
>
> So the rule should be: always use strings if at all possible and relevant.
> If the data is fundamentally binary, it shouldn't be re-coded to ascii
> (no real advantage), but if the data is "stringish", and there aren't
> big performance issues, then keep it as strings.
Admiring your concern, I would like to follow the above directions.
Best regards,
Toshiharu Harada
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-23 7:37 ` Toshiharu Harada
@ 2009-02-25 19:46 ` Pavel Machek
2009-02-27 1:27 ` KOSAKI Motohiro
0 siblings, 1 reply; 23+ messages in thread
From: Pavel Machek @ 2009-02-25 19:46 UTC (permalink / raw)
To: Toshiharu Harada
Cc: Tetsuo Handa, jmorris, takedakn, linux-security-module,
linux-kernel, akpm
On Mon 2009-02-23 16:37:02, Toshiharu Harada wrote:
> Pavel Machek wrote:
>> On Sun 2009-02-22 23:27:34, Tetsuo Handa wrote:
>>> Pavel Machek wrote:
>>>> On Thu 2009-02-12 16:34:16, James Morris wrote:
>>>>> On Thu, 5 Feb 2009, Kentaro Takeda wrote:
>>>>>
>>>>>> TOMOYO Linux is a name-based MAC extension (LSM module) for the Linux kernel.
>>>>>>
>>>>> Applied to
>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next
>>>>>
>>>> Does that mean tomoyo is scheduled for 2.6.30?
>>>>
>>> TOMOYO is already in linux-next tree and ready to go into 2.6.30 .
>>
>> Last time I looked it included script parser and some
>> interpretter... Was that solved?
>
> Are you talking about the interface between
> userland and kernel regarding string data?
Yes. maybe ioctl() is worse, but I don't think c-like language parser
in kernel is acceptable.
> Linus once said in a Smack thread (http://lkml.org/lkml/2007/11/5/129)
>>> On Sun, Nov 04, 2007 at 12:28:48PM +0000, Pavel Machek wrote:
>>> > Can we avoid string parsers in the kernel?
>>>
>>> Ok, Could someone suggest a better idea please ?.
>>
>> I personally think string parsers are *much* better than the
>> alternatives (which basically boil down to nasty binary interfaces)
>>
>>> I thought about packing the rules in a structure and sending
>>> it over an ioctl() command. Is this applicable ?
>>
>> That's *MUCH* worse.
>>
>> Strings are nice. They aren't that complex, and as long as it's not a
>> performance-critical area, there are basically no downsides.
>>
>> Binary structures and ioctl's are *much* worse. They are totally
>> undebuggable with generic tools (think "echo" or "strace"), and they
>> are a total nightmare to parse across architectures and pointer sizes.
>>
>> So the rule should be: always use strings if at all possible and relevant.
>> If the data is fundamentally binary, it shouldn't be re-coded to ascii
>> (no real advantage), but if the data is "stringish", and there aren't
>> big performance issues, then keep it as strings.
>
> Admiring your concern, I would like to follow the above directions.
>
> Best regards,
> Toshiharu Harada
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-25 19:46 ` Pavel Machek
@ 2009-02-27 1:27 ` KOSAKI Motohiro
2009-03-01 22:45 ` Pavel Machek
0 siblings, 1 reply; 23+ messages in thread
From: KOSAKI Motohiro @ 2009-02-27 1:27 UTC (permalink / raw)
To: Pavel Machek
Cc: kosaki.motohiro, Toshiharu Harada, Tetsuo Handa, jmorris,
takedakn, linux-security-module, linux-kernel, akpm
Hi Pavel,
> >>>>>> TOMOYO Linux is a name-based MAC extension (LSM module) for the Linux kernel.
> >>>>>>
> >>>>> Applied to
> >>>>> git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next
> >>>>>
> >>>> Does that mean tomoyo is scheduled for 2.6.30?
> >>>>
> >>> TOMOYO is already in linux-next tree and ready to go into 2.6.30 .
> >>
> >> Last time I looked it included script parser and some
> >> interpretter... Was that solved?
>
> >
> > Are you talking about the interface between
> > userland and kernel regarding string data?
>
> Yes. maybe ioctl() is worse, but I don't think c-like language parser
> in kernel is acceptable.
for just clarification to me.
IIUC, many developers said UNNECESSARY parser is BAD (yes, I also think so),
but nobody said any parser is bad.
Therefore, I think point is that the patch have enough reasonable reason or not.
and, I thought "pavel, good job. you're right" at you oppositing time because
tomoyo did't explain any reason at that time.
However, they changed. the patch description of the "[TOMOYO #15 3/8] Common functions for TOMOYO Linux."
explain the reason.
for me, I feel it's reasonable reason. then I didn't oppose current tomoyo posting.
So, I don't understand which you oppose
(1) ANY parser is bad.
(2) current description still don't explain enough reason.
May I ask you?
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [TOMOYO #15 0/8] TOMOYO Linux
2009-02-27 1:27 ` KOSAKI Motohiro
@ 2009-03-01 22:45 ` Pavel Machek
0 siblings, 0 replies; 23+ messages in thread
From: Pavel Machek @ 2009-03-01 22:45 UTC (permalink / raw)
To: KOSAKI Motohiro
Cc: Toshiharu Harada, Tetsuo Handa, jmorris, takedakn,
linux-security-module, linux-kernel, akpm
Hi!
> > Yes. maybe ioctl() is worse, but I don't think c-like language parser
> > in kernel is acceptable.
>
> for just clarification to me.
>
> IIUC, many developers said UNNECESSARY parser is BAD (yes, I also think so),
> but nobody said any parser is bad.
>
> Therefore, I think point is that the patch have enough reasonable reason or not.
> and, I thought "pavel, good job. you're right" at you oppositing time because
> tomoyo did't explain any reason at that time.
>
> However, they changed. the patch description of the "[TOMOYO #15 3/8] Common functions for TOMOYO Linux."
> explain the reason.
> for me, I feel it's reasonable reason. then I didn't oppose current tomoyo posting.
>
> So, I don't understand which you oppose
> (1) ANY parser is bad.
> (2) current description still don't explain enough reason.
>
> May I ask you?
I'm not sure if I've seen all the TOMOYO patches... But from what I've
seen of TOMOYO design, putting the parser into kernel was "just
because"; it did not have any good reason. I hate to say that, but
AppArmor was better designed there.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
^ permalink raw reply [flat|nested] 23+ messages in thread