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, result = 0;
  26         char *op = "ima_audit";
  27         char *cause;
  28
  29         rc = strict_strtoul(str, 0, &audit);
  30         if (rc || audit > 1)
  31                 result = 1;
  32         else
  33                 ima_audit = audit;
  34         cause = ima_audit ? "enabled" : "not_enabled";
  35         integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
  36                             op, cause, result, 0);
  37         return 1;
  38 }
  39 __setup("ima_audit=", ima_audit_setup);
  40 #endif
  41
  42 void integrity_audit_msg(int audit_msgno, struct inode *inode,
  43                          const unsigned char *fname, const char *op,
  44                          const char *cause, int result, int audit_info)
  45 {
  46         struct audit_buffer *ab;
  47
  48         if (!ima_audit && audit_info == 1) /* Skip informational messages */
  49                 return;
  50
  51         ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
  52         audit_log_format(ab, "integrity: pid=%d uid=%u auid=%u ses=%u",
  53                          current->pid, current->cred->uid,
  54                          audit_get_loginuid(current),
  55                          audit_get_sessionid(current));
  56         audit_log_task_context(ab);
  57         switch (audit_msgno) {
  58         case AUDIT_INTEGRITY_DATA:
  59         case AUDIT_INTEGRITY_METADATA:
  60         case AUDIT_INTEGRITY_PCR:
  61         case AUDIT_INTEGRITY_STATUS:
  62                 audit_log_format(ab, " op=%s cause=%s", op, cause);
  63                 break;
  64         case AUDIT_INTEGRITY_HASH:
  65                 audit_log_format(ab, " op=%s hash=%s", op, cause);
  66                 break;
  67         default:
  68                 audit_log_format(ab, " op=%s", op);
  69         }
  70         audit_log_format(ab, " comm=");
  71         audit_log_untrustedstring(ab, current->comm);
  72         if (fname) {
  73                 audit_log_format(ab, " name=");
  74                 audit_log_untrustedstring(ab, fname);
  75         }
  76         if (inode)
  77                 audit_log_format(ab, " dev=%s ino=%lu",
  78                                  inode->i_sb->s_id, inode->i_ino);
  79         audit_log_format(ab, " res=%d", !result ? 0 : 1);
  80         audit_log_end(ab);
  81 }