integrity: IMA as an integrity service provider
[linux-3.10.git] / security / integrity / ima / ima_audit.c
1 /*
2  * Copyright (C) 2008 IBM Corporation
3  * Author: Mimi Zohar <zohar@us.ibm.com>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation, version 2 of the License.
8  *
9  * File: integrity_audit.c
10  *      Audit calls for the integrity subsystem
11  */
12
13 #include <linux/fs.h>
14 #include <linux/audit.h>
15 #include "ima.h"
16
17 static int ima_audit;
18
19 #ifdef CONFIG_IMA_AUDIT
20
21 /* ima_audit_setup - enable informational auditing messages */
22 static int __init ima_audit_setup(char *str)
23 {
24         unsigned long audit;
25         int rc;
26         char *op;
27
28         rc = strict_strtoul(str, 0, &audit);
29         if (rc || audit > 1)
30                 printk(KERN_INFO "ima: invalid ima_audit value\n");
31         else
32                 ima_audit = audit;
33         op = ima_audit ? "ima_audit_enabled" : "ima_audit_not_enabled";
34         integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL, NULL, op, 0, 0);
35         return 1;
36 }
37 __setup("ima_audit=", ima_audit_setup);
38 #endif
39
40 void integrity_audit_msg(int audit_msgno, struct inode *inode,
41                          const unsigned char *fname, const char *op,
42                          const char *cause, int result, int audit_info)
43 {
44         struct audit_buffer *ab;
45
46         if (!ima_audit && audit_info == 1) /* Skip informational messages */
47                 return;
48
49         ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
50         audit_log_format(ab, "integrity: pid=%d uid=%u auid=%u",
51                          current->pid, current->cred->uid,
52                          audit_get_loginuid(current));
53         audit_log_task_context(ab);
54         switch (audit_msgno) {
55         case AUDIT_INTEGRITY_DATA:
56         case AUDIT_INTEGRITY_METADATA:
57         case AUDIT_INTEGRITY_PCR:
58                 audit_log_format(ab, " op=%s cause=%s", op, cause);
59                 break;
60         case AUDIT_INTEGRITY_HASH:
61                 audit_log_format(ab, " op=%s hash=%s", op, cause);
62                 break;
63         case AUDIT_INTEGRITY_STATUS:
64         default:
65                 audit_log_format(ab, " op=%s", op);
66         }
67         audit_log_format(ab, " comm=");
68         audit_log_untrustedstring(ab, current->comm);
69         if (fname) {
70                 audit_log_format(ab, " name=");
71                 audit_log_untrustedstring(ab, fname);
72         }
73         if (inode)
74                 audit_log_format(ab, " dev=%s ino=%lu",
75                                  inode->i_sb->s_id, inode->i_ino);
76         audit_log_format(ab, " res=%d", result);
77         audit_log_end(ab);
78 }