[TOMOYO 06/15](repost) Auditing interface.

Kentaro Takeda
2007-10-02T07:33:52Z

This patch makes access logs sent to auditing subsystem.
TOMOYO Linux uses two channels for auditing.
One is 'AUDIT_TMY_GRANTED', used for auditing accesses which are
granted in the TOMOYO Linux policy.
The other is 'AUDIT_TMY_REJECTED', used for auditing accesses which
are not granted in the TOMOYO Linux policy.

Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
---
include/linux/audit.h | 3 ++
security/tomoyo/audit.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 71 insertions(+)

--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6/security/tomoyo/audit.c 2007-10-02 11:26:22.000000000 +0900
@@ -0,0 +1,68 @@
+/*
+ * security/tomoyo/audit.c
+ *
+ * Audit functions for TOMOYO Linux
+ */
+
+#include "tomoyo.h"
+#include <linux/audit.h>
+
+/**
+ * tmy_init_audit_log - allocate and initialize audit buffer.
+ * @len: pointer to length of requested size.
+ *
+ * Returns pointer to audit buffer on success. @len received allocated size.
+ * Returns NULL on failure.
+ *
+ * @len must not be a NULL.
+ */
+char *tmy_init_audit_log(int *len)
+{
+ char *buf;
+ struct task_struct *task = current;
+ const char *domainname = TMY_SECURITY->domain->domainname->name;
+
+ *len += strlen(domainname) + 256;
+ buf = tmy_alloc(*len);
+
+ if (!buf)
+ return NULL;
+
+ snprintf(buf, (*len) - 1,
+ "pid=%d uid=%d gid=%d euid=%d egid=%d "
+ "suid=%d sgid=%d fsuid=%d fsgid=%d : %s : ",
+ task->pid, task->uid, task->gid, task->euid, task->egid,
+ task->suid, task->sgid, task->fsuid, task->fsgid, domainname);
+
+ return buf;
+}
+
+/**
+ * tmy_write_audit_log - write audit log.
+ * @buf: pointer to access log contents.
+ * @is_granted: is the access request granted?
+ * @is_enforce: is the access requested in enforcing mode?
+ *
+ * Returns zero on success.
+ * Returns nonzero on failure.
+ *
+ * Write audit log.
+ * Caller must allocate @buf with tmy_init_audit_log().
+ */
+int tmy_write_audit_log(char *buf, const u8 is_granted, const u8 is_enforce)
+{
+ struct audit_buffer *ab;
+ int type = is_granted ? AUDIT_TMY_GRANTED : AUDIT_TMY_REJECTED;
+
+ ab = audit_log_start(current->audit_context, GFP_KERNEL, type);
+ if (ab) {
+ const char *msg
+ = is_granted ? "granted" : is_enforce ?
+ "error" : "warning";
+ audit_log_format(ab, "TOMOYO %s: %s", msg, buf);
+ audit_log_end(ab);
+ }
+
+ tmy_free(buf);
+ return ab ? 0 : -ENOMEM;
+}
--- linux-2.6.orig/include/linux/audit.h 2007-10-02 11:11:52.000000000 +0900
+++ linux-2.6/include/linux/audit.h 2007-10-02 11:26:22.000000000 +0900
@@ -120,6 +120,9 @@

#define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */

+#define AUDIT_TMY_GRANTED 2001 /* TOMOYO Linux audit granted */
+#define AUDIT_TMY_REJECTED 2002 /* TOMOYO Linux audit rejected */
+
/* Rule flags */
#define AUDIT_FILTER_USER 0x00 /* Apply rule to user-generated messages */
#define AUDIT_FILTER_TASK 0x01 /* Apply rule at task creation (not syscall) */