LXR linux/security/integrity/integrity

   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
  15static int integrity_audit_info;
  16
  17/* ima_audit_setup - enable informational auditing messages */
  18static 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
  28void 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
  36void 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        audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u",
  49                         task_pid_nr(current),
  50                         from_kuid(&init_user_ns, current_uid()),
  51                         from_kuid(&init_user_ns, audit_get_loginuid(current)),
  52                         audit_get_sessionid(current));
  53        audit_log_task_context(ab);
  54        audit_log_format(ab, " op=%s cause=%s comm=", op, cause);
  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 errno=%d", !result, errno);
  66        audit_log_end(ab);
  67}
  68