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John Johansen67012e82010-07-29 14:47:58 -07001/*
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
Jan Engelhardt2d4cee72012-03-14 13:30:36 +010022const char *const op_table[] = {
John Johansen67012e82010-07-29 14:47:58 -070023 "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
Jan Engelhardt2d4cee72012-03-14 13:30:36 +010076const char *const audit_mode_names[] = {
John Johansen67012e82010-07-29 14:47:58 -070077 "normal",
78 "quiet_denied",
79 "quiet",
80 "noquiet",
81 "all"
82};
83
Jan Engelhardt2d4cee72012-03-14 13:30:36 +010084static const char *const aa_audit_type[] = {
John Johansen67012e82010-07-29 14:47:58 -070085 "AUDIT",
86 "ALLOWED",
87 "DENIED",
88 "HINT",
89 "STATUS",
90 "ERROR",
91 "KILLED"
John Johansenade3ddc2012-02-22 00:20:26 -080092 "AUTO"
John Johansen67012e82010-07-29 14:47:58 -070093};
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 */
111static 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=");
Eric Paris3b3b0e42012-04-03 09:37:02 -0700118 audit_log_string(ab, aa_audit_type[sa->aad->type]);
John Johansen67012e82010-07-29 14:47:58 -0700119 }
120
Eric Paris3b3b0e42012-04-03 09:37:02 -0700121 if (sa->aad->op) {
John Johansen67012e82010-07-29 14:47:58 -0700122 audit_log_format(ab, " operation=");
Eric Paris3b3b0e42012-04-03 09:37:02 -0700123 audit_log_string(ab, op_table[sa->aad->op]);
John Johansen67012e82010-07-29 14:47:58 -0700124 }
125
Eric Paris3b3b0e42012-04-03 09:37:02 -0700126 if (sa->aad->info) {
John Johansen67012e82010-07-29 14:47:58 -0700127 audit_log_format(ab, " info=");
Eric Paris3b3b0e42012-04-03 09:37:02 -0700128 audit_log_string(ab, sa->aad->info);
129 if (sa->aad->error)
130 audit_log_format(ab, " error=%d", sa->aad->error);
John Johansen67012e82010-07-29 14:47:58 -0700131 }
132
Eric Paris3b3b0e42012-04-03 09:37:02 -0700133 if (sa->aad->profile) {
134 struct aa_profile *profile = sa->aad->profile;
John Johansen67012e82010-07-29 14:47:58 -0700135 pid_t pid;
136 rcu_read_lock();
Kees Cook2053c472011-12-08 16:25:48 -0800137 pid = rcu_dereference(tsk->real_parent)->pid;
John Johansen67012e82010-07-29 14:47:58 -0700138 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
Eric Paris3b3b0e42012-04-03 09:37:02 -0700148 if (sa->aad->name) {
John Johansen67012e82010-07-29 14:47:58 -0700149 audit_log_format(ab, " name=");
Eric Paris3b3b0e42012-04-03 09:37:02 -0700150 audit_log_untrustedstring(ab, sa->aad->name);
John Johansen67012e82010-07-29 14:47:58 -0700151 }
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 */
159void aa_audit_msg(int type, struct common_audit_data *sa,
160 void (*cb) (struct audit_buffer *, void *))
161{
Eric Paris3b3b0e42012-04-03 09:37:02 -0700162 sa->aad->type = type;
Linus Torvaldsb61c37f2012-04-02 15:48:12 -0700163 common_lsm_audit(sa, audit_pre, cb);
John Johansen67012e82010-07-29 14:47:58 -0700164}
165
166/**
167 * aa_audit - Log a profile based audit event to the audit subsystem
168 * @type: audit type for the message
169 * @profile: profile to check against (NOT NULL)
170 * @gfp: allocation flags to use
171 * @sa: audit event (NOT NULL)
172 * @cb: optional callback fn for type specific fields (MAYBE NULL)
173 *
174 * Handle default message switching based off of audit mode flags
175 *
176 * Returns: error on failure
177 */
178int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
179 struct common_audit_data *sa,
180 void (*cb) (struct audit_buffer *, void *))
181{
182 BUG_ON(!profile);
183
184 if (type == AUDIT_APPARMOR_AUTO) {
Eric Paris3b3b0e42012-04-03 09:37:02 -0700185 if (likely(!sa->aad->error)) {
John Johansen67012e82010-07-29 14:47:58 -0700186 if (AUDIT_MODE(profile) != AUDIT_ALL)
187 return 0;
188 type = AUDIT_APPARMOR_AUDIT;
189 } else if (COMPLAIN_MODE(profile))
190 type = AUDIT_APPARMOR_ALLOWED;
191 else
192 type = AUDIT_APPARMOR_DENIED;
193 }
194 if (AUDIT_MODE(profile) == AUDIT_QUIET ||
195 (type == AUDIT_APPARMOR_DENIED &&
196 AUDIT_MODE(profile) == AUDIT_QUIET))
Eric Paris3b3b0e42012-04-03 09:37:02 -0700197 return sa->aad->error;
John Johansen67012e82010-07-29 14:47:58 -0700198
199 if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
200 type = AUDIT_APPARMOR_KILL;
201
202 if (!unconfined(profile))
Eric Paris3b3b0e42012-04-03 09:37:02 -0700203 sa->aad->profile = profile;
John Johansen67012e82010-07-29 14:47:58 -0700204
205 aa_audit_msg(type, sa, cb);
206
Eric Paris3b3b0e42012-04-03 09:37:02 -0700207 if (sa->aad->type == AUDIT_APPARMOR_KILL)
John Johansen67012e82010-07-29 14:47:58 -0700208 (void)send_sig_info(SIGKILL, NULL, sa->tsk ? sa->tsk : current);
209
Eric Paris3b3b0e42012-04-03 09:37:02 -0700210 if (sa->aad->type == AUDIT_APPARMOR_ALLOWED)
211 return complain_error(sa->aad->error);
John Johansen67012e82010-07-29 14:47:58 -0700212
Eric Paris3b3b0e42012-04-03 09:37:02 -0700213 return sa->aad->error;
John Johansen67012e82010-07-29 14:47:58 -0700214}