security/integrity/integrity_audit.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2008 IBM Corporation
   4  * Author: Mimi Zohar <zohar@us.ibm.com>
   5  *
   6  * File: integrity_audit.c
   7  *      Audit calls for the integrity subsystem
   8  */
   9
  10 #include <linux/fs.h>
  11 #include <linux/gfp.h>
  12 #include <linux/audit.h>
  13 #include "integrity.h"
  14
  15 static int integrity_audit_info;
  16
  17 /* ima_audit_setup - enable informational auditing messages */
  18 static int __init integrity_audit_setup(char *str)
  19 {
  20         unsigned long audit;
  21
  22         if (!kstrtoul(str, 0, &audit))
  23                 integrity_audit_info = audit ? 1 : 0;
  24         return 1;
  25 }
  26 __setup("integrity_audit=", integrity_audit_setup);
  27
  28 void integrity_audit_msg(int audit_msgno, struct inode *inode,
  29                          const unsigned char *fname, const char *op,
  30                          const char *cause, int result, int audit_info)
  31 {
  32         integrity_audit_message(audit_msgno, inode, fname, op, cause,
  33                                 result, audit_info, 0);
  34 }
  35
  36 void integrity_audit_message(int audit_msgno, struct inode *inode,
  37                              const unsigned char *fname, const char *op,
  38                              const char *cause, int result, int audit_info,
  39                              int errno)
  40 {
  41         struct audit_buffer *ab;
  42         char name[TASK_COMM_LEN];
  43
  44         if (!integrity_audit_info && audit_info == 1)   /* Skip info messages */
  45                 return;
  46
  47         ab = audit_log_start(audit_context(), GFP_KERNEL, audit_msgno);
  48         if (!ab)
  49                 return;
  50         audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u",
  51                          task_pid_nr(current),
  52                          from_kuid(&init_user_ns, current_uid()),
  53                          from_kuid(&init_user_ns, audit_get_loginuid(current)),
  54                          audit_get_sessionid(current));
  55         audit_log_task_context(ab);
  56         audit_log_format(ab, " op=%s cause=%s comm=", op, cause);
  57         audit_log_untrustedstring(ab, get_task_comm(name, current));
  58         if (fname) {
  59                 audit_log_format(ab, " name=");
  60                 audit_log_untrustedstring(ab, fname);
  61         }
  62         if (inode) {
  63                 audit_log_format(ab, " dev=");
  64                 audit_log_untrustedstring(ab, inode->i_sb->s_id);
  65                 audit_log_format(ab, " ino=%lu", inode->i_ino);
  66         }
  67         audit_log_format(ab, " res=%d errno=%d", !result, errno);
  68         audit_log_end(ab);
  69 }