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/gfp.h>
  15 #include <linux/audit.h>
  16 #include "ima.h"
  17
  18 static int ima_audit;
  19
  20 #ifdef CONFIG_IMA_AUDIT
  21
  22 /* ima_audit_setup - enable informational auditing messages */
  23 static int __init ima_audit_setup(char *str)
  24 {
  25         unsigned long audit;
  26
  27         if (!strict_strtoul(str, 0, &audit))
  28                 ima_audit = audit ? 1 : 0;
  29         return 1;
  30 }
  31 __setup("ima_audit=", ima_audit_setup);
  32 #endif
  33
  34 void integrity_audit_msg(int audit_msgno, struct inode *inode,
  35                          const unsigned char *fname, const char *op,
  36                          const char *cause, int result, int audit_info)
  37 {
  38         struct audit_buffer *ab;
  39
  40         if (!ima_audit && audit_info == 1) /* Skip informational messages */
  41                 return;
  42
  43         ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
  44         audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u",
  45                          current->pid, current_cred()->uid,
  46                          audit_get_loginuid(current),
  47                          audit_get_sessionid(current));
  48         audit_log_task_context(ab);
  49         audit_log_format(ab, " op=");
  50         audit_log_string(ab, op);
  51         audit_log_format(ab, " cause=");
  52         audit_log_string(ab, cause);
  53         audit_log_format(ab, " comm=");
  54         audit_log_untrustedstring(ab, current->comm);
  55         if (fname) {
  56                 audit_log_format(ab, " name=");
  57                 audit_log_untrustedstring(ab, fname);
  58         }
  59         if (inode) {
  60                 audit_log_format(ab, " dev=");
  61                 audit_log_untrustedstring(ab, inode->i_sb->s_id);
  62                 audit_log_format(ab, " ino=%lu", inode->i_ino);
  63         }
  64         audit_log_format(ab, " res=%d", !result ? 0 : 1);
  65         audit_log_end(ab);
  66 }