[PATCH V4 6/8] audit: log namespace serial numbers

Richard Guy Briggs
2014-08-21T01:09:39Z

Log the namespace serial numbers of a task in a new record type (1329) (usually
accompanies audit_log_task_info() type=SYSCALL record) which is used by syscall
audits, among others..

Idea first presented:
https://www.redhat.com/archives/linux-audit/2013-March/msg00020.html

Typical output format would look something like:
type=NS_INFO msg=audit(1408577535.306:82): netns=8 utsns=2 ipcns=1 pidns=4 userns=3 mntns=5

The serial numbers are printed in hex.

Suggested-by: Aristeu Rozanski <arozansk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Richard Guy Briggs <rgb-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Acked-by: Serge Hallyn <serge.hallyn-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
---
include/linux/audit.h | 7 +++++++
include/uapi/linux/audit.h | 1 +
kernel/audit.c | 29 +++++++++++++++++++++++++++++
kernel/auditsc.c | 2 ++
security/integrity/ima/ima_api.c | 2 ++
5 files changed, 41 insertions(+), 0 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 22cfddb..5ea3609 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -101,6 +101,13 @@ extern int __weak audit_classify_compat_syscall(int abi, unsigned syscall);
struct filename;

extern void audit_log_session_info(struct audit_buffer *ab);
+#ifdef CONFIG_NAMESPACES
+extern void audit_log_namespace_info(struct task_struct *tsk);
+#else
+void audit_log_namespace_info(struct task_struct *tsk)
+{
+}
+#endif

#ifdef CONFIG_AUDIT_COMPAT_GENERIC
#define audit_is_compat(arch) (!((arch) & __AUDIT_ARCH_64BIT))
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index cf67147..84bbcdb 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -110,6 +110,7 @@
#define AUDIT_SECCOMP 1326 /* Secure Computing event */
#define AUDIT_PROCTITLE 1327 /* Proctitle emit event */
#define AUDIT_FEATURE_CHANGE 1328 /* audit log listing feature changes */
+#define AUDIT_NS_INFO 1329 /* Record process namespace IDs */

#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */
diff --git a/kernel/audit.c b/kernel/audit.c
index 3ef2e0e..a4c39a0 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -65,6 +65,7 @@
#include <linux/freezer.h>
#include <linux/tty.h>
#include <linux/pid_namespace.h>
+#include <linux/proc_ns.h>
#include <net/netns/generic.h>

#include "audit.h"
@@ -743,6 +744,8 @@ static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature
audit_feature_names[which], !!old_feature, !!new_feature,
!!old_lock, !!new_lock, res);
audit_log_end(ab);
+
+ audit_log_namespace_info(current);
}

static int audit_set_feature(struct sk_buff *skb)
@@ -1661,6 +1664,30 @@ void audit_log_session_info(struct audit_buffer *ab)
audit_log_format(ab, " auid=%u ses=%u", auid, sessionid);
}

+#ifdef CONFIG_NAMESPACES
+void audit_log_namespace_info(struct task_struct *tsk)
+{
+ const struct proc_ns_operations **entry;
+ bool end = false;
+ struct audit_buffer *ab;
+
+ if (!tsk)
+ return;
+ ab = audit_log_start(tsk->audit_context, GFP_KERNEL,
+ AUDIT_NS_INFO);
+ if (!ab)
+ return;
+ for (entry = ns_entries; !end; entry++) {
+ void *ns = (*entry)->get(tsk);
+ audit_log_format(ab, " %sns=%llx", (*entry)->name,
+ (*entry)->snum(ns));
+ (*entry)->put(ns);
+ end = (*entry)->type == CLONE_NEWNS;
+ }
+ audit_log_end(ab);
+}
+#endif /* CONFIG_NAMESPACES */
+
void audit_log_key(struct audit_buffer *ab, char *key)
{
audit_log_format(ab, " key=");
@@ -1933,6 +1960,8 @@ void audit_log_link_denied(const char *operation, struct path *link)
audit_log_format(ab, " res=0");
audit_log_end(ab);

+ audit_log_namespace_info(current);
+
/* Generate AUDIT_PATH record with object. */
name->type = AUDIT_TYPE_NORMAL;
audit_copy_inode(name, link->dentry, link->dentry->d_inode);
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 21eae3c..08b9af9 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1383,6 +1383,8 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_key(ab, context->filterkey);
audit_log_end(ab);

+ audit_log_namespace_info(tsk);
+
for (aux = context->aux; aux; aux = aux->next) {

ab = audit_log_start(context, GFP_KERNEL, aux->type);
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index d9cd5ce..06d6897 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -323,6 +323,8 @@ void ima_audit_measurement(struct integrity_iint_cache *iint,
audit_log_task_info(ab, current);
audit_log_end(ab);

+ audit_log_namespace_info(current);
+
iint->flags |= IMA_AUDITED;
}

--
1.7.1