security/apparmor/audit.c

   1 /*
   2  * AppArmor security module
   3  *
   4  * This file contains AppArmor auditing functions
   5  *
   6  * Copyright (C) 1998-2008 Novell/SUSE
   7  * Copyright 2009-2010 Canonical Ltd.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation, version 2 of the
  12  * License.
  13  */
  14
  15 #include <linux/audit.h>
  16 #include <linux/socket.h>
  17
  18 #include "include/apparmor.h"
  19 #include "include/audit.h"
  20 #include "include/policy.h"
  21
  22 const char *const op_table[] = {
  23         "null",
  24
  25         "sysctl",
  26         "capable",
  27
  28         "unlink",
  29         "mkdir",
  30         "rmdir",
  31         "mknod",
  32         "truncate",
  33         "link",
  34         "symlink",
  35         "rename_src",
  36         "rename_dest",
  37         "chmod",
  38         "chown",
  39         "getattr",
  40         "open",
  41
  42         "file_perm",
  43         "file_lock",
  44         "file_mmap",
  45         "file_mprotect",
  46
  47         "create",
  48         "post_create",
  49         "bind",
  50         "connect",
  51         "listen",
  52         "accept",
  53         "sendmsg",
  54         "recvmsg",
  55         "getsockname",
  56         "getpeername",
  57         "getsockopt",
  58         "setsockopt",
  59         "socket_shutdown",
  60
  61         "ptrace",
  62
  63         "exec",
  64         "change_hat",
  65         "change_profile",
  66         "change_onexec",
  67
  68         "setprocattr",
  69         "setrlimit",
  70
  71         "profile_replace",
  72         "profile_load",
  73         "profile_remove"
  74 };
  75
  76 const char *const audit_mode_names[] = {
  77         "normal",
  78         "quiet_denied",
  79         "quiet",
  80         "noquiet",
  81         "all"
  82 };
  83
  84 static const char *const aa_audit_type[] = {
  85         "AUDIT",
  86         "ALLOWED",
  87         "DENIED",
  88         "HINT",
  89         "STATUS",
  90         "ERROR",
  91         "KILLED"
  92         "AUTO"
  93 };
  94
  95 /*
  96  * Currently AppArmor auditing is fed straight into the audit framework.
  97  *
  98  * TODO:
  99  * netlink interface for complain mode
 100  * user auditing, - send user auditing to netlink interface
 101  * system control of whether user audit messages go to system log
 102  */
 103
 104 /**
 105  * audit_base - core AppArmor function.
 106  * @ab: audit buffer to fill (NOT NULL)
 107  * @ca: audit structure containing data to audit (NOT NULL)
 108  *
 109  * Record common AppArmor audit data from @sa
 110  */
 111 static void audit_pre(struct audit_buffer *ab, void *ca)
 112 {
 113         struct common_audit_data *sa = ca;
 114         struct task_struct *tsk = sa->tsk ? sa->tsk : current;
 115
 116         if (aa_g_audit_header) {
 117                 audit_log_format(ab, "apparmor=");
 118                 audit_log_string(ab, aa_audit_type[sa->aad.type]);
 119         }
 120
 121         if (sa->aad.op) {
 122                 audit_log_format(ab, " operation=");
 123                 audit_log_string(ab, op_table[sa->aad.op]);
 124         }
 125
 126         if (sa->aad.info) {
 127                 audit_log_format(ab, " info=");
 128                 audit_log_string(ab, sa->aad.info);
 129                 if (sa->aad.error)
 130                         audit_log_format(ab, " error=%d", sa->aad.error);
 131         }
 132
 133         if (sa->aad.profile) {
 134                 struct aa_profile *profile = sa->aad.profile;
 135                 pid_t pid;
 136                 rcu_read_lock();
 137                 pid = rcu_dereference(tsk->real_parent)->pid;
 138                 rcu_read_unlock();
 139                 audit_log_format(ab, " parent=%d", pid);
 140                 if (profile->ns != root_ns) {
 141                         audit_log_format(ab, " namespace=");
 142                         audit_log_untrustedstring(ab, profile->ns->base.hname);
 143                 }
 144                 audit_log_format(ab, " profile=");
 145                 audit_log_untrustedstring(ab, profile->base.hname);
 146         }
 147
 148         if (sa->aad.name) {
 149                 audit_log_format(ab, " name=");
 150                 audit_log_untrustedstring(ab, sa->aad.name);
 151         }
 152 }
 153
 154 /**
 155  * aa_audit_msg - Log a message to the audit subsystem
 156  * @sa: audit event structure (NOT NULL)
 157  * @cb: optional callback fn for type specific fields (MAYBE NULL)
 158  */
 159 void aa_audit_msg(int type, struct common_audit_data *sa,
 160                   void (*cb) (struct audit_buffer *, void *))
 161 {
 162         sa->aad.type = type;
 163         sa->lsm_pre_audit = audit_pre;
 164         sa->lsm_post_audit = cb;
 165         common_lsm_audit(sa);
 166 }
 167
 168 /**
 169  * aa_audit - Log a profile based audit event to the audit subsystem
 170  * @type: audit type for the message
 171  * @profile: profile to check against (NOT NULL)
 172  * @gfp: allocation flags to use
 173  * @sa: audit event (NOT NULL)
 174  * @cb: optional callback fn for type specific fields (MAYBE NULL)
 175  *
 176  * Handle default message switching based off of audit mode flags
 177  *
 178  * Returns: error on failure
 179  */
 180 int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
 181              struct common_audit_data *sa,
 182              void (*cb) (struct audit_buffer *, void *))
 183 {
 184         BUG_ON(!profile);
 185
 186         if (type == AUDIT_APPARMOR_AUTO) {
 187                 if (likely(!sa->aad.error)) {
 188                         if (AUDIT_MODE(profile) != AUDIT_ALL)
 189                                 return 0;
 190                         type = AUDIT_APPARMOR_AUDIT;
 191                 } else if (COMPLAIN_MODE(profile))
 192                         type = AUDIT_APPARMOR_ALLOWED;
 193                 else
 194                         type = AUDIT_APPARMOR_DENIED;
 195         }
 196         if (AUDIT_MODE(profile) == AUDIT_QUIET ||
 197             (type == AUDIT_APPARMOR_DENIED &&
 198              AUDIT_MODE(profile) == AUDIT_QUIET))
 199                 return sa->aad.error;
 200
 201         if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
 202                 type = AUDIT_APPARMOR_KILL;
 203
 204         if (!unconfined(profile))
 205                 sa->aad.profile = profile;
 206
 207         aa_audit_msg(type, sa, cb);
 208
 209         if (sa->aad.type == AUDIT_APPARMOR_KILL)
 210                 (void)send_sig_info(SIGKILL, NULL, sa->tsk ? sa->tsk : current);
 211
 212         if (sa->aad.type == AUDIT_APPARMOR_ALLOWED)
 213                 return complain_error(sa->aad.error);
 214
 215         return sa->aad.error;
 216 }