security/integrity/integrity_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 "integrity.h"
  17
  18 static int integrity_audit_info;
  19
  20 /* ima_audit_setup - enable informational auditing messages */
  21 static int __init integrity_audit_setup(char *str)
  22 {
  23         unsigned long audit;
  24
  25         if (!kstrtoul(str, 0, &audit))
  26                 integrity_audit_info = audit ? 1 : 0;
  27         return 1;
  28 }
  29 __setup("integrity_audit=", integrity_audit_setup);
  30
  31 void integrity_audit_msg(int audit_msgno, struct inode *inode,
  32                          const unsigned char *fname, const char *op,
  33                          const char *cause, int result, int audit_info)
  34 {
  35         struct audit_buffer *ab;
  36         char name[TASK_COMM_LEN];
  37
  38         if (!integrity_audit_info && audit_info == 1)   /* Skip info messages */
  39                 return;
  40
  41         ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
  42         if (!ab)
  43                 return;
  44         audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u",
  45                          task_pid_nr(current),
  46                          from_kuid(&init_user_ns, current_cred()->uid),
  47                          from_kuid(&init_user_ns, audit_get_loginuid(current)),
  48                          audit_get_sessionid(current));
  49         audit_log_task_context(ab);
  50         audit_log_format(ab, " op=");
  51         audit_log_string(ab, op);
  52         audit_log_format(ab, " cause=");
  53         audit_log_string(ab, cause);
  54         audit_log_format(ab, " comm=");
  55         audit_log_untrustedstring(ab, get_task_comm(name, current));
  56         if (fname) {
  57                 audit_log_format(ab, " name=");
  58                 audit_log_untrustedstring(ab, fname);
  59         }
  60         if (inode) {
  61                 audit_log_format(ab, " dev=");
  62                 audit_log_untrustedstring(ab, inode->i_sb->s_id);
  63                 audit_log_format(ab, " ino=%lu", inode->i_ino);
  64         }
  65         audit_log_format(ab, " res=%d", !result);
  66         audit_log_end(ab);
  67 }