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85c87212005-04-29 16:23:29 +01001/* audit.c -- Auditing support
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Gateway between the kernel (e.g., selinux) and the user-space audit daemon.
3 * System-call specific features have moved to auditsc.c
4 *
Steve Grubb6a01b072007-01-19 14:39:55 -05005 * Copyright 2003-2007 Red Hat Inc., Durham, North Carolina.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * All Rights Reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
23 *
Ahmed S. Darwishd7a96f32008-03-01 22:01:11 +020024 * Goals: 1) Integrate fully with Security Modules.
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 * 2) Minimal run-time overhead:
26 * a) Minimal when syscall auditing is disabled (audit_enable=0).
27 * b) Small when syscall auditing is enabled and no audit record
28 * is generated (defer as much work as possible to record
29 * generation time):
30 * i) context is allocated,
31 * ii) names from getname are stored without a copy, and
32 * iii) inode information stored from path_lookup.
33 * 3) Ability to disable syscall auditing at boot time (audit=0).
34 * 4) Usable by other parts of the kernel (if audit_log* is called,
35 * then a syscall record will be generated automatically for the
36 * current syscall).
37 * 5) Netlink interface to user-space.
38 * 6) Support low-overhead kernel-based filtering to minimize the
39 * information that must be passed to user-space.
40 *
85c87212005-04-29 16:23:29 +010041 * Example user-space utilities: http://people.redhat.com/sgrubb/audit/
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 */
43
Joe Perchesd957f7b2014-01-14 10:33:12 -080044#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
45
Davidlohr Bueso5b282552015-02-22 18:20:09 -080046#include <linux/file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/init.h>
Paul McQuade7153e402014-06-06 14:37:37 -070048#include <linux/types.h>
Arun Sharma600634972011-07-26 16:09:06 -070049#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/mm.h>
Paul Gortmaker9984de12011-05-23 14:51:41 -040051#include <linux/export.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090052#include <linux/slab.h>
David Woodhouseb7d11252005-05-19 10:56:58 +010053#include <linux/err.h>
54#include <linux/kthread.h>
Richard Guy Briggs46e959e2013-05-03 14:03:50 -040055#include <linux/kernel.h>
Eric Parisb24a30a2013-04-30 15:30:32 -040056#include <linux/syscalls.h>
Paul Moore5b523302017-03-21 11:26:35 -040057#include <linux/spinlock.h>
58#include <linux/rcupdate.h>
59#include <linux/mutex.h>
60#include <linux/gfp.h>
Paul Mooreb6c7c112017-05-02 10:16:05 -040061#include <linux/pid.h>
Paul Moore8cc96382017-05-02 10:16:05 -040062#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64#include <linux/audit.h>
65
66#include <net/sock.h>
Amy Griffis93315ed2006-02-07 12:05:27 -050067#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <linux/skbuff.h>
Mr Dash Four131ad622011-06-30 13:31:57 +020069#ifdef CONFIG_SECURITY
70#include <linux/security.h>
71#endif
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080072#include <linux/freezer.h>
Eric W. Biederman34e36d82012-09-10 23:20:20 -070073#include <linux/pid_namespace.h>
Richard Guy Briggs33faba72013-07-16 13:18:45 -040074#include <net/netns/generic.h>
Darrel Goeddel3dc7e312006-03-10 18:14:06 -060075
76#include "audit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Eric Parisa3f07112008-11-05 12:47:09 -050078/* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 * (Initialization happens after skb_init is called.) */
Eric Parisa3f07112008-11-05 12:47:09 -050080#define AUDIT_DISABLED -1
81#define AUDIT_UNINITIALIZED 0
82#define AUDIT_INITIALIZED 1
Linus Torvalds1da177e2005-04-16 15:20:36 -070083static int audit_initialized;
84
Eric Paris1a6b9f22008-01-07 17:09:31 -050085#define AUDIT_OFF 0
86#define AUDIT_ON 1
87#define AUDIT_LOCKED 2
Paul Moore0ad0bb62017-09-01 09:44:34 -040088u32 audit_enabled = AUDIT_OFF;
89u32 audit_ever_enabled = !!AUDIT_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Jan Engelhardtae9d67af2011-01-18 06:48:12 +010091EXPORT_SYMBOL_GPL(audit_enabled);
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093/* Default state when kernel boots without any parameters. */
Paul Moore0ad0bb62017-09-01 09:44:34 -040094static u32 audit_default = AUDIT_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96/* If auditing cannot proceed, audit_failure selects what happens. */
Joe Perches3e1d0bb2014-01-14 10:33:13 -080097static u32 audit_failure = AUDIT_FAIL_PRINTK;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Paul Moore5b523302017-03-21 11:26:35 -040099/* private audit network namespace index */
100static unsigned int audit_net_id;
101
102/**
103 * struct audit_net - audit private network namespace data
104 * @sk: communication socket
Pavel Emelyanov75c03712008-03-20 15:39:41 -0700105 */
Paul Moore5b523302017-03-21 11:26:35 -0400106struct audit_net {
107 struct sock *sk;
108};
109
110/**
111 * struct auditd_connection - kernel/auditd connection state
112 * @pid: auditd PID
113 * @portid: netlink portid
114 * @net: the associated network namespace
Paul Moore48d0e022017-05-02 10:16:05 -0400115 * @rcu: RCU head
Paul Moore5b523302017-03-21 11:26:35 -0400116 *
117 * Description:
118 * This struct is RCU protected; you must either hold the RCU lock for reading
Paul Moore48d0e022017-05-02 10:16:05 -0400119 * or the associated spinlock for writing.
Paul Moore5b523302017-03-21 11:26:35 -0400120 */
121static struct auditd_connection {
Paul Mooreb6c7c112017-05-02 10:16:05 -0400122 struct pid *pid;
Paul Moore5b523302017-03-21 11:26:35 -0400123 u32 portid;
124 struct net *net;
Paul Moore48d0e022017-05-02 10:16:05 -0400125 struct rcu_head rcu;
126} *auditd_conn = NULL;
127static DEFINE_SPINLOCK(auditd_conn_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Randy Dunlapb0dd25a2005-09-13 12:47:11 -0700129/* If audit_rate_limit is non-zero, limit the rate of sending audit records
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 * to that number per second. This prevents DoS attacks, but results in
131 * audit records being dropped. */
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800132static u32 audit_rate_limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Richard Guy Briggs40c07752013-10-22 13:28:49 -0400134/* Number of outstanding audit_buffers allowed.
135 * When set to zero, this means unlimited. */
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800136static u32 audit_backlog_limit = 64;
Richard Guy Briggse789e562013-09-12 23:03:51 -0400137#define AUDIT_BACKLOG_WAIT_TIME (60 * HZ)
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800138static u32 audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Steve Grubbc2f0c7c2005-05-06 12:38:39 +0100140/* The identity of the user shutting down the audit system. */
Eric W. Biedermancca080d2012-02-07 16:53:48 -0800141kuid_t audit_sig_uid = INVALID_UID;
Steve Grubbc2f0c7c2005-05-06 12:38:39 +0100142pid_t audit_sig_pid = -1;
Al Viroe1396062006-05-25 10:19:47 -0400143u32 audit_sig_sid = 0;
Steve Grubbc2f0c7c2005-05-06 12:38:39 +0100144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145/* Records can be lost in several ways:
146 0) [suppressed in audit_alloc]
147 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
148 2) out of memory in audit_log_move [alloc_skb]
149 3) suppressed due to audit_rate_limit
150 4) suppressed due to audit_backlog_limit
151*/
Richard Guy Briggs92c82e82017-01-13 03:26:29 -0500152static atomic_t audit_lost = ATOMIC_INIT(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Amy Griffisf368c07d2006-04-07 16:55:56 -0400154/* Hash for inode-based rules */
155struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
156
Paul Moore8cc96382017-05-02 10:16:05 -0400157static struct kmem_cache *audit_buffer_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Paul Moorec6480202016-11-29 16:53:25 -0500159/* queue msgs to send via kauditd_task */
Paul Mooreaf8b8242016-11-29 16:53:24 -0500160static struct sk_buff_head audit_queue;
Paul Moorec6480202016-11-29 16:53:25 -0500161/* queue msgs due to temporary unicast send problems */
162static struct sk_buff_head audit_retry_queue;
163/* queue msgs waiting for new auditd connection */
Paul Mooreaf8b8242016-11-29 16:53:24 -0500164static struct sk_buff_head audit_hold_queue;
Paul Moorec6480202016-11-29 16:53:25 -0500165
166/* queue servicing thread */
David Woodhouseb7d11252005-05-19 10:56:58 +0100167static struct task_struct *kauditd_task;
168static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
Paul Moorec6480202016-11-29 16:53:25 -0500169
170/* waitqueue for callers who are blocked on the audit backlog */
David Woodhouse9ad9ad32005-06-22 15:04:33 +0100171static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Eric Parisb0fed402013-05-22 12:54:49 -0400173static struct audit_features af = {.vers = AUDIT_FEATURE_VERSION,
174 .mask = -1,
175 .features = 0,
176 .lock = 0,};
177
Eric Paris21b85c32013-05-23 14:26:00 -0400178static char *audit_feature_names[2] = {
Eric Parisd040e5a2013-05-24 09:18:04 -0400179 "only_unset_loginuid",
Eric Paris21b85c32013-05-23 14:26:00 -0400180 "loginuid_immutable",
Eric Parisb0fed402013-05-22 12:54:49 -0400181};
182
183
Amy Griffisf368c07d2006-04-07 16:55:56 -0400184/* Serialize requests from userspace. */
Al Viro916d7572009-06-24 00:02:38 -0400185DEFINE_MUTEX(audit_cmd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
187/* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
188 * audit records. Since printk uses a 1024 byte buffer, this buffer
189 * should be at least that large. */
190#define AUDIT_BUFSIZ 1024
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192/* The audit_buffer is used when formatting an audit record. The caller
193 * locks briefly to get the record off the freelist or to allocate the
194 * buffer, and locks briefly to send the buffer to the netlink layer or
195 * to place it on a transmit queue. Multiple audit_buffers can be in
196 * use simultaneously. */
197struct audit_buffer {
Chris Wright8fc61152005-05-06 15:54:17 +0100198 struct sk_buff *skb; /* formatted skb ready to send */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 struct audit_context *ctx; /* NULL or associated context */
Al Viro9796fdd2005-10-21 03:22:03 -0400200 gfp_t gfp_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201};
202
Eric Parisf09ac9d2008-04-18 10:11:04 -0400203struct audit_reply {
Richard Guy Briggsf9441632013-08-14 11:32:45 -0400204 __u32 portid;
Eric W. Biederman638a0fd2014-02-28 10:49:05 -0800205 struct net *net;
Eric Parisf09ac9d2008-04-18 10:11:04 -0400206 struct sk_buff *skb;
207};
208
Paul Moore5b523302017-03-21 11:26:35 -0400209/**
210 * auditd_test_task - Check to see if a given task is an audit daemon
211 * @task: the task to check
212 *
213 * Description:
214 * Return 1 if the task is a registered audit daemon, 0 otherwise.
215 */
Paul Mooreb6c7c112017-05-02 10:16:05 -0400216int auditd_test_task(struct task_struct *task)
Paul Moore5b523302017-03-21 11:26:35 -0400217{
218 int rc;
Paul Moore48d0e022017-05-02 10:16:05 -0400219 struct auditd_connection *ac;
Paul Moore5b523302017-03-21 11:26:35 -0400220
221 rcu_read_lock();
Paul Moore48d0e022017-05-02 10:16:05 -0400222 ac = rcu_dereference(auditd_conn);
223 rc = (ac && ac->pid == task_tgid(task) ? 1 : 0);
Paul Moore5b523302017-03-21 11:26:35 -0400224 rcu_read_unlock();
225
226 return rc;
227}
228
229/**
Paul Mooreb6c7c112017-05-02 10:16:05 -0400230 * auditd_pid_vnr - Return the auditd PID relative to the namespace
Paul Mooreb6c7c112017-05-02 10:16:05 -0400231 *
232 * Description:
Paul Moore48d0e022017-05-02 10:16:05 -0400233 * Returns the PID in relation to the namespace, 0 on failure.
Paul Mooreb6c7c112017-05-02 10:16:05 -0400234 */
Paul Moore48d0e022017-05-02 10:16:05 -0400235static pid_t auditd_pid_vnr(void)
Paul Mooreb6c7c112017-05-02 10:16:05 -0400236{
237 pid_t pid;
Paul Moore48d0e022017-05-02 10:16:05 -0400238 const struct auditd_connection *ac;
Paul Mooreb6c7c112017-05-02 10:16:05 -0400239
240 rcu_read_lock();
Paul Moore48d0e022017-05-02 10:16:05 -0400241 ac = rcu_dereference(auditd_conn);
242 if (!ac || !ac->pid)
Paul Mooreb6c7c112017-05-02 10:16:05 -0400243 pid = 0;
244 else
Paul Moore48d0e022017-05-02 10:16:05 -0400245 pid = pid_vnr(ac->pid);
Paul Mooreb6c7c112017-05-02 10:16:05 -0400246 rcu_read_unlock();
247
248 return pid;
249}
250
251/**
Paul Moore5b523302017-03-21 11:26:35 -0400252 * audit_get_sk - Return the audit socket for the given network namespace
253 * @net: the destination network namespace
254 *
255 * Description:
256 * Returns the sock pointer if valid, NULL otherwise. The caller must ensure
257 * that a reference is held for the network namespace while the sock is in use.
258 */
259static struct sock *audit_get_sk(const struct net *net)
260{
261 struct audit_net *aunet;
262
263 if (!net)
264 return NULL;
265
266 aunet = net_generic(net, audit_net_id);
267 return aunet->sk;
268}
269
Dustin Kirkland8c8570f2005-11-03 17:15:16 +0000270void audit_panic(const char *message)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271{
Joe Perchesd957f7b2014-01-14 10:33:12 -0800272 switch (audit_failure) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 case AUDIT_FAIL_SILENT:
274 break;
275 case AUDIT_FAIL_PRINTK:
Eric Paris320f1b12008-01-23 22:55:05 -0500276 if (printk_ratelimit())
Joe Perchesd957f7b2014-01-14 10:33:12 -0800277 pr_err("%s\n", message);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 break;
279 case AUDIT_FAIL_PANIC:
Paul Moore5b523302017-03-21 11:26:35 -0400280 panic("audit: %s\n", message);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 break;
282 }
283}
284
285static inline int audit_rate_check(void)
286{
287 static unsigned long last_check = 0;
288 static int messages = 0;
289 static DEFINE_SPINLOCK(lock);
290 unsigned long flags;
291 unsigned long now;
292 unsigned long elapsed;
293 int retval = 0;
294
295 if (!audit_rate_limit) return 1;
296
297 spin_lock_irqsave(&lock, flags);
298 if (++messages < audit_rate_limit) {
299 retval = 1;
300 } else {
301 now = jiffies;
302 elapsed = now - last_check;
303 if (elapsed > HZ) {
304 last_check = now;
305 messages = 0;
306 retval = 1;
307 }
308 }
309 spin_unlock_irqrestore(&lock, flags);
310
311 return retval;
312}
313
Randy Dunlapb0dd25a2005-09-13 12:47:11 -0700314/**
315 * audit_log_lost - conditionally log lost audit message event
316 * @message: the message stating reason for lost audit message
317 *
318 * Emit at least 1 message per second, even if audit_rate_check is
319 * throttling.
320 * Always increment the lost messages counter.
321*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322void audit_log_lost(const char *message)
323{
324 static unsigned long last_msg = 0;
325 static DEFINE_SPINLOCK(lock);
326 unsigned long flags;
327 unsigned long now;
328 int print;
329
330 atomic_inc(&audit_lost);
331
332 print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit);
333
334 if (!print) {
335 spin_lock_irqsave(&lock, flags);
336 now = jiffies;
337 if (now - last_msg > HZ) {
338 print = 1;
339 last_msg = now;
340 }
341 spin_unlock_irqrestore(&lock, flags);
342 }
343
344 if (print) {
Eric Paris320f1b12008-01-23 22:55:05 -0500345 if (printk_ratelimit())
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800346 pr_warn("audit_lost=%u audit_rate_limit=%u audit_backlog_limit=%u\n",
Eric Paris320f1b12008-01-23 22:55:05 -0500347 atomic_read(&audit_lost),
348 audit_rate_limit,
349 audit_backlog_limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 audit_panic(message);
351 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800354static int audit_log_config_change(char *function_name, u32 new, u32 old,
Eric Paris25323862008-04-18 10:09:25 -0400355 int allow_changes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
Eric Paris1a6b9f22008-01-07 17:09:31 -0500357 struct audit_buffer *ab;
358 int rc = 0;
Steve Grubb6a01b072007-01-19 14:39:55 -0500359
Eric Paris1a6b9f22008-01-07 17:09:31 -0500360 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
Kees Cook0644ec02013-01-11 14:32:07 -0800361 if (unlikely(!ab))
362 return rc;
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800363 audit_log_format(ab, "%s=%u old=%u", function_name, new, old);
Eric Paris4d3fb702013-04-30 09:53:34 -0400364 audit_log_session_info(ab);
Eric Parisb122c372013-04-19 15:00:33 -0400365 rc = audit_log_task_context(ab);
366 if (rc)
367 allow_changes = 0; /* Something weird, deny request */
Eric Paris1a6b9f22008-01-07 17:09:31 -0500368 audit_log_format(ab, " res=%d", allow_changes);
369 audit_log_end(ab);
370 return rc;
371}
372
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800373static int audit_do_config_change(char *function_name, u32 *to_change, u32 new)
Eric Paris1a6b9f22008-01-07 17:09:31 -0500374{
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800375 int allow_changes, rc = 0;
376 u32 old = *to_change;
Eric Paris1a6b9f22008-01-07 17:09:31 -0500377
378 /* check if we are locked */
379 if (audit_enabled == AUDIT_LOCKED)
380 allow_changes = 0;
381 else
382 allow_changes = 1;
383
384 if (audit_enabled != AUDIT_OFF) {
Eric Parisdc9eb692013-04-19 13:23:09 -0400385 rc = audit_log_config_change(function_name, new, old, allow_changes);
Eric Paris1a6b9f22008-01-07 17:09:31 -0500386 if (rc)
387 allow_changes = 0;
388 }
Steve Grubb6a01b072007-01-19 14:39:55 -0500389
390 /* If we are allowed, make the change */
Eric Paris1a6b9f22008-01-07 17:09:31 -0500391 if (allow_changes == 1)
392 *to_change = new;
Steve Grubb6a01b072007-01-19 14:39:55 -0500393 /* Not allowed, update reason */
394 else if (rc == 0)
395 rc = -EPERM;
396 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397}
398
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800399static int audit_set_rate_limit(u32 limit)
Eric Paris1a6b9f22008-01-07 17:09:31 -0500400{
Eric Parisdc9eb692013-04-19 13:23:09 -0400401 return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit);
Eric Paris1a6b9f22008-01-07 17:09:31 -0500402}
403
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800404static int audit_set_backlog_limit(u32 limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405{
Eric Parisdc9eb692013-04-19 13:23:09 -0400406 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407}
408
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800409static int audit_set_backlog_wait_time(u32 timeout)
Richard Guy Briggs51cc83f2013-09-18 11:55:12 -0400410{
411 return audit_do_config_change("audit_backlog_wait_time",
Paul Moore31975422016-11-29 16:53:25 -0500412 &audit_backlog_wait_time, timeout);
Richard Guy Briggs51cc83f2013-09-18 11:55:12 -0400413}
414
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800415static int audit_set_enabled(u32 state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
Eric Parisb593d382008-01-08 17:38:31 -0500417 int rc;
Pranith Kumar724e7bf2015-03-11 14:08:19 -0400418 if (state > AUDIT_LOCKED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 return -EINVAL;
Steve Grubbce29b682006-04-01 18:29:34 -0500420
Eric Parisdc9eb692013-04-19 13:23:09 -0400421 rc = audit_do_config_change("audit_enabled", &audit_enabled, state);
Eric Parisb593d382008-01-08 17:38:31 -0500422 if (!rc)
423 audit_ever_enabled |= !!state;
424
425 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426}
427
Joe Perches3e1d0bb2014-01-14 10:33:13 -0800428static int audit_set_failure(u32 state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 if (state != AUDIT_FAIL_SILENT
431 && state != AUDIT_FAIL_PRINTK
432 && state != AUDIT_FAIL_PANIC)
433 return -EINVAL;
Steve Grubbce29b682006-04-01 18:29:34 -0500434
Eric Parisdc9eb692013-04-19 13:23:09 -0400435 return audit_do_config_change("audit_failure", &audit_failure, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436}
437
Paul Moore5b523302017-03-21 11:26:35 -0400438/**
Paul Moore48d0e022017-05-02 10:16:05 -0400439 * auditd_conn_free - RCU helper to release an auditd connection struct
440 * @rcu: RCU head
441 *
442 * Description:
443 * Drop any references inside the auditd connection tracking struct and free
444 * the memory.
445 */
446 static void auditd_conn_free(struct rcu_head *rcu)
447 {
448 struct auditd_connection *ac;
449
450 ac = container_of(rcu, struct auditd_connection, rcu);
451 put_pid(ac->pid);
452 put_net(ac->net);
453 kfree(ac);
454 }
455
456/**
Paul Moore5b523302017-03-21 11:26:35 -0400457 * auditd_set - Set/Reset the auditd connection state
458 * @pid: auditd PID
459 * @portid: auditd netlink portid
460 * @net: auditd network namespace pointer
Chris Riches309b7142023-10-18 09:23:51 +0000461 * @skb: the netlink command from the audit daemon
462 * @ack: netlink ack flag, cleared if ack'd here
Paul Moore5b523302017-03-21 11:26:35 -0400463 *
464 * Description:
465 * This function will obtain and drop network namespace references as
Paul Moore48d0e022017-05-02 10:16:05 -0400466 * necessary. Returns zero on success, negative values on failure.
Paul Moore5b523302017-03-21 11:26:35 -0400467 */
Chris Riches309b7142023-10-18 09:23:51 +0000468static int auditd_set(struct pid *pid, u32 portid, struct net *net,
469 struct sk_buff *skb, bool *ack)
Paul Moore5b523302017-03-21 11:26:35 -0400470{
471 unsigned long flags;
Paul Moore48d0e022017-05-02 10:16:05 -0400472 struct auditd_connection *ac_old, *ac_new;
Chris Riches309b7142023-10-18 09:23:51 +0000473 struct nlmsghdr *nlh;
Paul Moore5b523302017-03-21 11:26:35 -0400474
Paul Moore48d0e022017-05-02 10:16:05 -0400475 if (!pid || !net)
476 return -EINVAL;
477
478 ac_new = kzalloc(sizeof(*ac_new), GFP_KERNEL);
479 if (!ac_new)
480 return -ENOMEM;
481 ac_new->pid = get_pid(pid);
482 ac_new->portid = portid;
483 ac_new->net = get_net(net);
484
Chris Riches309b7142023-10-18 09:23:51 +0000485 /* send the ack now to avoid a race with the queue backlog */
486 if (*ack) {
487 nlh = nlmsg_hdr(skb);
488 netlink_ack(skb, nlh, 0, NULL);
489 *ack = false;
490 }
491
Paul Moore48d0e022017-05-02 10:16:05 -0400492 spin_lock_irqsave(&auditd_conn_lock, flags);
493 ac_old = rcu_dereference_protected(auditd_conn,
494 lockdep_is_held(&auditd_conn_lock));
495 rcu_assign_pointer(auditd_conn, ac_new);
496 spin_unlock_irqrestore(&auditd_conn_lock, flags);
497
498 if (ac_old)
499 call_rcu(&ac_old->rcu, auditd_conn_free);
500
501 return 0;
Paul Moore5b523302017-03-21 11:26:35 -0400502}
503
504/**
Paul Moore5b523302017-03-21 11:26:35 -0400505 * kauditd_print_skb - Print the audit record to the ring buffer
506 * @skb: audit record
507 *
508 * Whatever the reason, this packet may not make it to the auditd connection
509 * so write it via printk so the information isn't completely lost.
Eric Paris038cbcf2009-06-11 14:31:35 -0400510 */
Paul Mooreaf8b8242016-11-29 16:53:24 -0500511static void kauditd_printk_skb(struct sk_buff *skb)
Eric Paris038cbcf2009-06-11 14:31:35 -0400512{
513 struct nlmsghdr *nlh = nlmsg_hdr(skb);
David S. Millerc64e66c2012-06-26 21:45:21 -0700514 char *data = nlmsg_data(nlh);
Eric Paris038cbcf2009-06-11 14:31:35 -0400515
Paul Moore5b523302017-03-21 11:26:35 -0400516 if (nlh->nlmsg_type != AUDIT_EOE && printk_ratelimit())
517 pr_notice("type=%d %s\n", nlh->nlmsg_type, data);
518}
519
520/**
521 * kauditd_rehold_skb - Handle a audit record send failure in the hold queue
522 * @skb: audit record
Paul Moore6ddff8f2022-01-13 18:54:38 -0500523 * @error: error code (unused)
Paul Moore5b523302017-03-21 11:26:35 -0400524 *
525 * Description:
526 * This should only be used by the kauditd_thread when it fails to flush the
527 * hold queue.
528 */
Paul Moore6ddff8f2022-01-13 18:54:38 -0500529static void kauditd_rehold_skb(struct sk_buff *skb, __always_unused int error)
Paul Moore5b523302017-03-21 11:26:35 -0400530{
Paul Moore6ddff8f2022-01-13 18:54:38 -0500531 /* put the record back in the queue */
532 skb_queue_tail(&audit_hold_queue, skb);
Eric Paris038cbcf2009-06-11 14:31:35 -0400533}
534
Paul Moorec6480202016-11-29 16:53:25 -0500535/**
536 * kauditd_hold_skb - Queue an audit record, waiting for auditd
537 * @skb: audit record
Paul Moore6ddff8f2022-01-13 18:54:38 -0500538 * @error: error code
Paul Moorec6480202016-11-29 16:53:25 -0500539 *
540 * Description:
541 * Queue the audit record, waiting for an instance of auditd. When this
542 * function is called we haven't given up yet on sending the record, but things
543 * are not looking good. The first thing we want to do is try to write the
544 * record via printk and then see if we want to try and hold on to the record
545 * and queue it, if we have room. If we want to hold on to the record, but we
546 * don't have room, record a record lost message.
547 */
Paul Moore6ddff8f2022-01-13 18:54:38 -0500548static void kauditd_hold_skb(struct sk_buff *skb, int error)
Eric Parisf3d357b2008-04-18 10:02:28 -0400549{
Paul Moorec6480202016-11-29 16:53:25 -0500550 /* at this point it is uncertain if we will ever send this to auditd so
551 * try to send the message via printk before we go any further */
552 kauditd_printk_skb(skb);
Richard Guy Briggs32a1dba2015-11-04 08:23:50 -0500553
Paul Moorec6480202016-11-29 16:53:25 -0500554 /* can we just silently drop the message? */
Paul Moore6ddff8f2022-01-13 18:54:38 -0500555 if (!audit_default)
556 goto drop;
557
558 /* the hold queue is only for when the daemon goes away completely,
559 * not -EAGAIN failures; if we are in a -EAGAIN state requeue the
560 * record on the retry queue unless it's full, in which case drop it
561 */
562 if (error == -EAGAIN) {
563 if (!audit_backlog_limit ||
564 skb_queue_len(&audit_retry_queue) < audit_backlog_limit) {
565 skb_queue_tail(&audit_retry_queue, skb);
566 return;
567 }
568 audit_log_lost("kauditd retry queue overflow");
569 goto drop;
Paul Moorec6480202016-11-29 16:53:25 -0500570 }
571
Paul Moore6ddff8f2022-01-13 18:54:38 -0500572 /* if we have room in the hold queue, queue the message */
Paul Moorec6480202016-11-29 16:53:25 -0500573 if (!audit_backlog_limit ||
574 skb_queue_len(&audit_hold_queue) < audit_backlog_limit) {
575 skb_queue_tail(&audit_hold_queue, skb);
576 return;
577 }
578
579 /* we have no other options - drop the message */
580 audit_log_lost("kauditd hold queue overflow");
Paul Moore6ddff8f2022-01-13 18:54:38 -0500581drop:
Paul Moorec6480202016-11-29 16:53:25 -0500582 kfree_skb(skb);
583}
584
585/**
586 * kauditd_retry_skb - Queue an audit record, attempt to send again to auditd
587 * @skb: audit record
Paul Moore6ddff8f2022-01-13 18:54:38 -0500588 * @error: error code (unused)
Paul Moorec6480202016-11-29 16:53:25 -0500589 *
590 * Description:
591 * Not as serious as kauditd_hold_skb() as we still have a connected auditd,
592 * but for some reason we are having problems sending it audit records so
593 * queue the given record and attempt to resend.
594 */
Paul Moore6ddff8f2022-01-13 18:54:38 -0500595static void kauditd_retry_skb(struct sk_buff *skb, __always_unused int error)
Paul Moorec6480202016-11-29 16:53:25 -0500596{
Paul Moore6ddff8f2022-01-13 18:54:38 -0500597 if (!audit_backlog_limit ||
598 skb_queue_len(&audit_retry_queue) < audit_backlog_limit) {
599 skb_queue_tail(&audit_retry_queue, skb);
600 return;
601 }
602
603 /* we have to drop the record, send it via printk as a last effort */
604 kauditd_printk_skb(skb);
605 audit_log_lost("kauditd retry queue overflow");
606 kfree_skb(skb);
Paul Moorec6480202016-11-29 16:53:25 -0500607}
608
609/**
Paul Moore264d5092017-04-10 11:16:59 -0400610 * auditd_reset - Disconnect the auditd connection
Paul Moorec81be522017-06-12 09:35:24 -0400611 * @ac: auditd connection state
Paul Moore264d5092017-04-10 11:16:59 -0400612 *
613 * Description:
614 * Break the auditd/kauditd connection and move all the queued records into the
Paul Moorec81be522017-06-12 09:35:24 -0400615 * hold queue in case auditd reconnects. It is important to note that the @ac
616 * pointer should never be dereferenced inside this function as it may be NULL
617 * or invalid, you can only compare the memory address! If @ac is NULL then
618 * the connection will always be reset.
Paul Moore264d5092017-04-10 11:16:59 -0400619 */
Paul Moorec81be522017-06-12 09:35:24 -0400620static void auditd_reset(const struct auditd_connection *ac)
Paul Moore264d5092017-04-10 11:16:59 -0400621{
Paul Moore48d0e022017-05-02 10:16:05 -0400622 unsigned long flags;
Paul Moore264d5092017-04-10 11:16:59 -0400623 struct sk_buff *skb;
Paul Moore48d0e022017-05-02 10:16:05 -0400624 struct auditd_connection *ac_old;
Paul Moore264d5092017-04-10 11:16:59 -0400625
626 /* if it isn't already broken, break the connection */
Paul Moore48d0e022017-05-02 10:16:05 -0400627 spin_lock_irqsave(&auditd_conn_lock, flags);
628 ac_old = rcu_dereference_protected(auditd_conn,
629 lockdep_is_held(&auditd_conn_lock));
Paul Moorec81be522017-06-12 09:35:24 -0400630 if (ac && ac != ac_old) {
631 /* someone already registered a new auditd connection */
632 spin_unlock_irqrestore(&auditd_conn_lock, flags);
633 return;
634 }
Paul Moore48d0e022017-05-02 10:16:05 -0400635 rcu_assign_pointer(auditd_conn, NULL);
636 spin_unlock_irqrestore(&auditd_conn_lock, flags);
637
638 if (ac_old)
639 call_rcu(&ac_old->rcu, auditd_conn_free);
Paul Moore264d5092017-04-10 11:16:59 -0400640
Paul Moorecd33f5f2017-06-12 11:53:09 -0400641 /* flush the retry queue to the hold queue, but don't touch the main
642 * queue since we need to process that normally for multicast */
Paul Moore264d5092017-04-10 11:16:59 -0400643 while ((skb = skb_dequeue(&audit_retry_queue)))
Paul Moore6ddff8f2022-01-13 18:54:38 -0500644 kauditd_hold_skb(skb, -ECONNREFUSED);
Paul Moore264d5092017-04-10 11:16:59 -0400645}
646
647/**
Paul Moore5b523302017-03-21 11:26:35 -0400648 * auditd_send_unicast_skb - Send a record via unicast to auditd
649 * @skb: audit record
Paul Moorec6480202016-11-29 16:53:25 -0500650 *
651 * Description:
Paul Moore5b523302017-03-21 11:26:35 -0400652 * Send a skb to the audit daemon, returns positive/zero values on success and
653 * negative values on failure; in all cases the skb will be consumed by this
654 * function. If the send results in -ECONNREFUSED the connection with auditd
655 * will be reset. This function may sleep so callers should not hold any locks
656 * where this would cause a problem.
Paul Moorec6480202016-11-29 16:53:25 -0500657 */
Paul Moore5b523302017-03-21 11:26:35 -0400658static int auditd_send_unicast_skb(struct sk_buff *skb)
Paul Moorec6480202016-11-29 16:53:25 -0500659{
Paul Moore5b523302017-03-21 11:26:35 -0400660 int rc;
661 u32 portid;
662 struct net *net;
663 struct sock *sk;
Paul Moore48d0e022017-05-02 10:16:05 -0400664 struct auditd_connection *ac;
Paul Moorec6480202016-11-29 16:53:25 -0500665
Paul Moore5b523302017-03-21 11:26:35 -0400666 /* NOTE: we can't call netlink_unicast while in the RCU section so
667 * take a reference to the network namespace and grab local
668 * copies of the namespace, the sock, and the portid; the
669 * namespace and sock aren't going to go away while we hold a
670 * reference and if the portid does become invalid after the RCU
671 * section netlink_unicast() should safely return an error */
672
673 rcu_read_lock();
Paul Moore48d0e022017-05-02 10:16:05 -0400674 ac = rcu_dereference(auditd_conn);
675 if (!ac) {
Paul Moore5b523302017-03-21 11:26:35 -0400676 rcu_read_unlock();
Shu Wangb0659ae2017-07-18 14:37:24 +0800677 kfree_skb(skb);
Paul Moore5b523302017-03-21 11:26:35 -0400678 rc = -ECONNREFUSED;
679 goto err;
Richard Guy Briggs533c7b62016-12-13 10:03:01 -0500680 }
Paul Moore48d0e022017-05-02 10:16:05 -0400681 net = get_net(ac->net);
Paul Moore5b523302017-03-21 11:26:35 -0400682 sk = audit_get_sk(net);
Paul Moore48d0e022017-05-02 10:16:05 -0400683 portid = ac->portid;
Paul Moore5b523302017-03-21 11:26:35 -0400684 rcu_read_unlock();
Paul Moorec6480202016-11-29 16:53:25 -0500685
Paul Moore5b523302017-03-21 11:26:35 -0400686 rc = netlink_unicast(sk, skb, portid, 0);
687 put_net(net);
688 if (rc < 0)
689 goto err;
690
691 return rc;
692
693err:
Paul Moorec81be522017-06-12 09:35:24 -0400694 if (ac && rc == -ECONNREFUSED)
695 auditd_reset(ac);
Paul Moore5b523302017-03-21 11:26:35 -0400696 return rc;
Paul Moorec6480202016-11-29 16:53:25 -0500697}
698
699/**
Paul Moore5b523302017-03-21 11:26:35 -0400700 * kauditd_send_queue - Helper for kauditd_thread to flush skb queues
701 * @sk: the sending sock
702 * @portid: the netlink destination
703 * @queue: the skb queue to process
704 * @retry_limit: limit on number of netlink unicast failures
705 * @skb_hook: per-skb hook for additional processing
706 * @err_hook: hook called if the skb fails the netlink unicast send
707 *
708 * Description:
709 * Run through the given queue and attempt to send the audit records to auditd,
710 * returns zero on success, negative values on failure. It is up to the caller
711 * to ensure that the @sk is valid for the duration of this function.
712 *
Paul Moorec6480202016-11-29 16:53:25 -0500713 */
Paul Moore5b523302017-03-21 11:26:35 -0400714static int kauditd_send_queue(struct sock *sk, u32 portid,
715 struct sk_buff_head *queue,
716 unsigned int retry_limit,
717 void (*skb_hook)(struct sk_buff *skb),
Paul Moore6ddff8f2022-01-13 18:54:38 -0500718 void (*err_hook)(struct sk_buff *skb, int error))
Paul Moorec6480202016-11-29 16:53:25 -0500719{
Paul Moore5b523302017-03-21 11:26:35 -0400720 int rc = 0;
Paul Moore6ddff8f2022-01-13 18:54:38 -0500721 struct sk_buff *skb = NULL;
722 struct sk_buff *skb_tail;
Paul Moore75fdb752021-12-09 11:46:07 -0500723 unsigned int failed = 0;
Paul Moorec6480202016-11-29 16:53:25 -0500724
Paul Moore5b523302017-03-21 11:26:35 -0400725 /* NOTE: kauditd_thread takes care of all our locking, we just use
726 * the netlink info passed to us (e.g. sk and portid) */
Paul Moore6c54e782016-11-29 16:53:26 -0500727
Paul Moore6ddff8f2022-01-13 18:54:38 -0500728 skb_tail = skb_peek_tail(queue);
729 while ((skb != skb_tail) && (skb = skb_dequeue(queue))) {
Paul Moore5b523302017-03-21 11:26:35 -0400730 /* call the skb_hook for each skb we touch */
731 if (skb_hook)
732 (*skb_hook)(skb);
733
734 /* can we send to anyone via unicast? */
735 if (!sk) {
736 if (err_hook)
Paul Moore6ddff8f2022-01-13 18:54:38 -0500737 (*err_hook)(skb, -ECONNREFUSED);
Paul Moore5b523302017-03-21 11:26:35 -0400738 continue;
739 }
740
Paul Moore75fdb752021-12-09 11:46:07 -0500741retry:
Paul Moore5b523302017-03-21 11:26:35 -0400742 /* grab an extra skb reference in case of error */
743 skb_get(skb);
744 rc = netlink_unicast(sk, skb, portid, 0);
745 if (rc < 0) {
Paul Moore75fdb752021-12-09 11:46:07 -0500746 /* send failed - try a few times unless fatal error */
Paul Moore5b523302017-03-21 11:26:35 -0400747 if (++failed >= retry_limit ||
748 rc == -ECONNREFUSED || rc == -EPERM) {
Paul Moore5b523302017-03-21 11:26:35 -0400749 sk = NULL;
750 if (err_hook)
Paul Moore6ddff8f2022-01-13 18:54:38 -0500751 (*err_hook)(skb, rc);
Paul Moore75fdb752021-12-09 11:46:07 -0500752 if (rc == -EAGAIN)
753 rc = 0;
754 /* continue to drain the queue */
Paul Moore5b523302017-03-21 11:26:35 -0400755 continue;
756 } else
Paul Moore75fdb752021-12-09 11:46:07 -0500757 goto retry;
Paul Moore5b523302017-03-21 11:26:35 -0400758 } else {
Paul Moore75fdb752021-12-09 11:46:07 -0500759 /* skb sent - drop the extra reference and continue */
Paul Moore5b523302017-03-21 11:26:35 -0400760 consume_skb(skb);
761 failed = 0;
762 }
Paul Moorec6480202016-11-29 16:53:25 -0500763 }
764
Paul Moore5b523302017-03-21 11:26:35 -0400765 return (rc >= 0 ? 0 : rc);
Eric Parisf3d357b2008-04-18 10:02:28 -0400766}
767
Richard Guy Briggsb551d1d2013-01-24 13:15:10 -0500768/*
Paul Moorec6480202016-11-29 16:53:25 -0500769 * kauditd_send_multicast_skb - Send a record to any multicast listeners
770 * @skb: audit record
Richard Guy Briggs451f9212014-04-22 21:31:57 -0400771 *
Paul Moorec6480202016-11-29 16:53:25 -0500772 * Description:
Paul Moore5b523302017-03-21 11:26:35 -0400773 * Write a multicast message to anyone listening in the initial network
774 * namespace. This function doesn't consume an skb as might be expected since
775 * it has to copy it anyways.
Richard Guy Briggs451f9212014-04-22 21:31:57 -0400776 */
Paul Moorec6480202016-11-29 16:53:25 -0500777static void kauditd_send_multicast_skb(struct sk_buff *skb)
Richard Guy Briggs451f9212014-04-22 21:31:57 -0400778{
Paul Moorec6480202016-11-29 16:53:25 -0500779 struct sk_buff *copy;
Paul Moore5b523302017-03-21 11:26:35 -0400780 struct sock *sock = audit_get_sk(&init_net);
Paul Moorec6480202016-11-29 16:53:25 -0500781 struct nlmsghdr *nlh;
Richard Guy Briggs451f9212014-04-22 21:31:57 -0400782
Paul Moore5b523302017-03-21 11:26:35 -0400783 /* NOTE: we are not taking an additional reference for init_net since
784 * we don't have to worry about it going away */
785
Richard Guy Briggs7f74ecd2014-04-22 21:31:58 -0400786 if (!netlink_has_listeners(sock, AUDIT_NLGRP_READLOG))
787 return;
788
Richard Guy Briggs451f9212014-04-22 21:31:57 -0400789 /*
790 * The seemingly wasteful skb_copy() rather than bumping the refcount
791 * using skb_get() is necessary because non-standard mods are made to
792 * the skb by the original kaudit unicast socket send routine. The
793 * existing auditd daemon assumes this breakage. Fixing this would
794 * require co-ordinating a change in the established protocol between
795 * the kaudit kernel subsystem and the auditd userspace code. There is
796 * no reason for new multicast clients to continue with this
797 * non-compliance.
798 */
Paul Moorec6480202016-11-29 16:53:25 -0500799 copy = skb_copy(skb, GFP_KERNEL);
Richard Guy Briggs451f9212014-04-22 21:31:57 -0400800 if (!copy)
801 return;
Paul Moorec6480202016-11-29 16:53:25 -0500802 nlh = nlmsg_hdr(copy);
803 nlh->nlmsg_len = skb->len;
Richard Guy Briggs451f9212014-04-22 21:31:57 -0400804
Paul Moorec6480202016-11-29 16:53:25 -0500805 nlmsg_multicast(sock, copy, 0, AUDIT_NLGRP_READLOG, GFP_KERNEL);
Richard Guy Briggs451f9212014-04-22 21:31:57 -0400806}
807
Paul Moorec6480202016-11-29 16:53:25 -0500808/**
Paul Moore5b523302017-03-21 11:26:35 -0400809 * kauditd_thread - Worker thread to send audit records to userspace
810 * @dummy: unused
Richard Guy Briggsb551d1d2013-01-24 13:15:10 -0500811 */
Adrian Bunk97a41e22006-01-08 01:02:17 -0800812static int kauditd_thread(void *dummy)
David Woodhouseb7d11252005-05-19 10:56:58 +0100813{
Paul Moorec6480202016-11-29 16:53:25 -0500814 int rc;
Paul Moore5b523302017-03-21 11:26:35 -0400815 u32 portid = 0;
816 struct net *net = NULL;
817 struct sock *sk = NULL;
Paul Moore48d0e022017-05-02 10:16:05 -0400818 struct auditd_connection *ac;
Paul Moore4aa838722016-11-29 16:53:24 -0500819
Paul Moorec6480202016-11-29 16:53:25 -0500820#define UNICAST_RETRIES 5
Paul Moorec6480202016-11-29 16:53:25 -0500821
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700822 set_freezable();
Andrew Morton4899b8b2006-10-06 00:43:48 -0700823 while (!kthread_should_stop()) {
Paul Moore5b523302017-03-21 11:26:35 -0400824 /* NOTE: see the lock comments in auditd_send_unicast_skb() */
825 rcu_read_lock();
Paul Moore48d0e022017-05-02 10:16:05 -0400826 ac = rcu_dereference(auditd_conn);
827 if (!ac) {
Paul Moore5b523302017-03-21 11:26:35 -0400828 rcu_read_unlock();
829 goto main_queue;
830 }
Paul Moore48d0e022017-05-02 10:16:05 -0400831 net = get_net(ac->net);
Paul Moore5b523302017-03-21 11:26:35 -0400832 sk = audit_get_sk(net);
Paul Moore48d0e022017-05-02 10:16:05 -0400833 portid = ac->portid;
Paul Moore5b523302017-03-21 11:26:35 -0400834 rcu_read_unlock();
Eric Parisf3d357b2008-04-18 10:02:28 -0400835
Paul Moorec6480202016-11-29 16:53:25 -0500836 /* attempt to flush the hold queue */
Paul Moore5b523302017-03-21 11:26:35 -0400837 rc = kauditd_send_queue(sk, portid,
838 &audit_hold_queue, UNICAST_RETRIES,
839 NULL, kauditd_rehold_skb);
Paul Moorec81be522017-06-12 09:35:24 -0400840 if (ac && rc < 0) {
Paul Moore5b523302017-03-21 11:26:35 -0400841 sk = NULL;
Paul Moorec81be522017-06-12 09:35:24 -0400842 auditd_reset(ac);
Paul Moore5b523302017-03-21 11:26:35 -0400843 goto main_queue;
David Woodhouseb7d11252005-05-19 10:56:58 +0100844 }
Richard Guy Briggs3320c512013-01-24 13:15:11 -0500845
Paul Moorec6480202016-11-29 16:53:25 -0500846 /* attempt to flush the retry queue */
Paul Moore5b523302017-03-21 11:26:35 -0400847 rc = kauditd_send_queue(sk, portid,
848 &audit_retry_queue, UNICAST_RETRIES,
849 NULL, kauditd_hold_skb);
Paul Moorec81be522017-06-12 09:35:24 -0400850 if (ac && rc < 0) {
Paul Moore5b523302017-03-21 11:26:35 -0400851 sk = NULL;
Paul Moorec81be522017-06-12 09:35:24 -0400852 auditd_reset(ac);
Paul Moore5b523302017-03-21 11:26:35 -0400853 goto main_queue;
Paul Moorec6480202016-11-29 16:53:25 -0500854 }
855
Paul Moore5b523302017-03-21 11:26:35 -0400856main_queue:
857 /* process the main queue - do the multicast send and attempt
858 * unicast, dump failed record sends to the retry queue; if
859 * sk == NULL due to previous failures we will just do the
Paul Moorec81be522017-06-12 09:35:24 -0400860 * multicast send and move the record to the hold queue */
Paul Moore264d5092017-04-10 11:16:59 -0400861 rc = kauditd_send_queue(sk, portid, &audit_queue, 1,
862 kauditd_send_multicast_skb,
Paul Moorec81be522017-06-12 09:35:24 -0400863 (sk ?
864 kauditd_retry_skb : kauditd_hold_skb));
865 if (ac && rc < 0)
866 auditd_reset(ac);
Paul Moore264d5092017-04-10 11:16:59 -0400867 sk = NULL;
Paul Moore4aa838722016-11-29 16:53:24 -0500868
Paul Moore5b523302017-03-21 11:26:35 -0400869 /* drop our netns reference, no auditd sends past this line */
870 if (net) {
871 put_net(net);
872 net = NULL;
Richard Guy Briggs3320c512013-01-24 13:15:11 -0500873 }
Paul Moore5b523302017-03-21 11:26:35 -0400874
875 /* we have processed all the queues so wake everyone */
876 wake_up(&audit_backlog_wait);
877
878 /* NOTE: we want to wake up if there is anything on the queue,
879 * regardless of if an auditd is connected, as we need to
880 * do the multicast send and rotate records from the
881 * main queue to the retry/hold queues */
882 wait_event_freezable(kauditd_wait,
883 (skb_queue_len(&audit_queue) ? 1 : 0));
David Woodhouseb7d11252005-05-19 10:56:58 +0100884 }
Paul Moorec6480202016-11-29 16:53:25 -0500885
Andrew Morton4899b8b2006-10-06 00:43:48 -0700886 return 0;
David Woodhouseb7d11252005-05-19 10:56:58 +0100887}
888
Paul Moore25d33162020-04-21 09:10:56 -0400889int audit_send_list_thread(void *_dest)
Al Viro9044e6b2006-05-22 01:09:24 -0400890{
891 struct audit_netlink_list *dest = _dest;
Al Viro9044e6b2006-05-22 01:09:24 -0400892 struct sk_buff *skb;
Paul Moore5b523302017-03-21 11:26:35 -0400893 struct sock *sk = audit_get_sk(dest->net);
Al Viro9044e6b2006-05-22 01:09:24 -0400894
895 /* wait for parent to finish and send an ACK */
Amy Griffisf368c07d2006-04-07 16:55:56 -0400896 mutex_lock(&audit_cmd_mutex);
897 mutex_unlock(&audit_cmd_mutex);
Al Viro9044e6b2006-05-22 01:09:24 -0400898
899 while ((skb = __skb_dequeue(&dest->q)) != NULL)
Paul Moore5b523302017-03-21 11:26:35 -0400900 netlink_unicast(sk, skb, dest->portid, 0);
Al Viro9044e6b2006-05-22 01:09:24 -0400901
Paul Moore5b523302017-03-21 11:26:35 -0400902 put_net(dest->net);
Al Viro9044e6b2006-05-22 01:09:24 -0400903 kfree(dest);
904
905 return 0;
906}
907
Paul Moore45a06422017-05-02 10:16:05 -0400908struct sk_buff *audit_make_reply(int seq, int type, int done,
Stephen Hemmingerb8800aa2010-10-20 17:23:50 -0700909 int multi, const void *payload, int size)
Al Viro9044e6b2006-05-22 01:09:24 -0400910{
911 struct sk_buff *skb;
912 struct nlmsghdr *nlh;
Al Viro9044e6b2006-05-22 01:09:24 -0400913 void *data;
914 int flags = multi ? NLM_F_MULTI : 0;
915 int t = done ? NLMSG_DONE : type;
916
Eric Parisee080e62009-06-11 14:31:35 -0400917 skb = nlmsg_new(size, GFP_KERNEL);
Al Viro9044e6b2006-05-22 01:09:24 -0400918 if (!skb)
919 return NULL;
920
Paul Moore45a06422017-05-02 10:16:05 -0400921 nlh = nlmsg_put(skb, 0, seq, t, size, flags);
David S. Millerc64e66c2012-06-26 21:45:21 -0700922 if (!nlh)
923 goto out_kfree_skb;
924 data = nlmsg_data(nlh);
Al Viro9044e6b2006-05-22 01:09:24 -0400925 memcpy(data, payload, size);
926 return skb;
927
David S. Millerc64e66c2012-06-26 21:45:21 -0700928out_kfree_skb:
929 kfree_skb(skb);
Al Viro9044e6b2006-05-22 01:09:24 -0400930 return NULL;
931}
932
Paul Mooreed251f42020-04-20 10:09:29 -0400933static void audit_free_reply(struct audit_reply *reply)
934{
935 if (!reply)
936 return;
937
938 if (reply->skb)
939 kfree_skb(reply->skb);
940 if (reply->net)
941 put_net(reply->net);
942 kfree(reply);
943}
944
Eric Parisf09ac9d2008-04-18 10:11:04 -0400945static int audit_send_reply_thread(void *arg)
946{
947 struct audit_reply *reply = (struct audit_reply *)arg;
948
949 mutex_lock(&audit_cmd_mutex);
950 mutex_unlock(&audit_cmd_mutex);
951
952 /* Ignore failure. It'll only happen if the sender goes away,
953 because our timeout is set to infinite. */
Paul Mooreed251f42020-04-20 10:09:29 -0400954 netlink_unicast(audit_get_sk(reply->net), reply->skb, reply->portid, 0);
955 reply->skb = NULL;
956 audit_free_reply(reply);
Eric Parisf09ac9d2008-04-18 10:11:04 -0400957 return 0;
958}
Paul Moorec6480202016-11-29 16:53:25 -0500959
Randy Dunlapb0dd25a2005-09-13 12:47:11 -0700960/**
961 * audit_send_reply - send an audit reply message via netlink
Eric W. Biedermand211f172014-03-08 15:31:54 -0800962 * @request_skb: skb of request we are replying to (used to target the reply)
Randy Dunlapb0dd25a2005-09-13 12:47:11 -0700963 * @seq: sequence number
964 * @type: audit message type
965 * @done: done (last) flag
966 * @multi: multi-part message flag
967 * @payload: payload data
968 * @size: payload size
969 *
Paul Mooreed251f42020-04-20 10:09:29 -0400970 * Allocates a skb, builds the netlink message, and sends it to the port id.
Randy Dunlapb0dd25a2005-09-13 12:47:11 -0700971 */
Eric W. Biederman6f285b12014-02-28 19:44:55 -0800972static void audit_send_reply(struct sk_buff *request_skb, int seq, int type, int done,
Richard Guy Briggsf9441632013-08-14 11:32:45 -0400973 int multi, const void *payload, int size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974{
Eric Parisf09ac9d2008-04-18 10:11:04 -0400975 struct task_struct *tsk;
Paul Mooreed251f42020-04-20 10:09:29 -0400976 struct audit_reply *reply;
Eric Parisf09ac9d2008-04-18 10:11:04 -0400977
Paul Mooreed251f42020-04-20 10:09:29 -0400978 reply = kzalloc(sizeof(*reply), GFP_KERNEL);
Eric Parisf09ac9d2008-04-18 10:11:04 -0400979 if (!reply)
980 return;
981
Paul Mooreed251f42020-04-20 10:09:29 -0400982 reply->skb = audit_make_reply(seq, type, done, multi, payload, size);
983 if (!reply->skb)
984 goto err;
985 reply->net = get_net(sock_net(NETLINK_CB(request_skb).sk));
Paul Moore45a06422017-05-02 10:16:05 -0400986 reply->portid = NETLINK_CB(request_skb).portid;
Eric Parisf09ac9d2008-04-18 10:11:04 -0400987
988 tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
Paul Mooreed251f42020-04-20 10:09:29 -0400989 if (IS_ERR(tsk))
990 goto err;
991
992 return;
993
994err:
995 audit_free_reply(reply);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996}
997
998/*
999 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
1000 * control messages.
1001 */
Darrel Goeddelc7bdb542006-06-27 13:26:11 -07001002static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003{
1004 int err = 0;
1005
Richard Guy Briggs5a3cb3b2013-08-16 00:04:46 -04001006 /* Only support initial user namespace for now. */
Eric Parisaa4af832014-03-30 19:07:54 -04001007 /*
1008 * We return ECONNREFUSED because it tricks userspace into thinking
1009 * that audit was not configured into the kernel. Lots of users
1010 * configure their PAM stack (because that's what the distro does)
1011 * to reject login if unable to send messages to audit. If we return
1012 * ECONNREFUSED the PAM stack thinks the kernel does not have audit
1013 * configured in and will let login proceed. If we return EPERM
1014 * userspace will reject all logins. This should be removed when we
1015 * support non init namespaces!!
1016 */
Linus Torvalds0b747172014-04-12 12:38:53 -07001017 if (current_user_ns() != &init_user_ns)
Eric Parisaa4af832014-03-30 19:07:54 -04001018 return -ECONNREFUSED;
Eric W. Biederman34e36d82012-09-10 23:20:20 -07001019
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 switch (msg_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 case AUDIT_LIST:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 case AUDIT_ADD:
1023 case AUDIT_DEL:
Eric Paris18900902013-04-18 19:16:36 -04001024 return -EOPNOTSUPP;
1025 case AUDIT_GET:
1026 case AUDIT_SET:
Eric Parisb0fed402013-05-22 12:54:49 -04001027 case AUDIT_GET_FEATURE:
1028 case AUDIT_SET_FEATURE:
Eric Paris18900902013-04-18 19:16:36 -04001029 case AUDIT_LIST_RULES:
1030 case AUDIT_ADD_RULE:
Amy Griffis93315ed2006-02-07 12:05:27 -05001031 case AUDIT_DEL_RULE:
Steve Grubbc2f0c7c2005-05-06 12:38:39 +01001032 case AUDIT_SIGNAL_INFO:
Miloslav Trmac522ed772007-07-15 23:40:56 -07001033 case AUDIT_TTY_GET:
1034 case AUDIT_TTY_SET:
Al Viro74c3cbe2007-07-22 08:04:18 -04001035 case AUDIT_TRIM:
1036 case AUDIT_MAKE_EQUIV:
Richard Guy Briggs5a3cb3b2013-08-16 00:04:46 -04001037 /* Only support auditd and auditctl in initial pid namespace
1038 * for now. */
Ameen Ali5985de62015-02-23 15:38:00 -05001039 if (task_active_pid_ns(current) != &init_pid_ns)
Richard Guy Briggs5a3cb3b2013-08-16 00:04:46 -04001040 return -EPERM;
1041
Eric W. Biederman90f62cf2014-04-23 14:29:27 -07001042 if (!netlink_capable(skb, CAP_AUDIT_CONTROL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 err = -EPERM;
1044 break;
Steve Grubb05474102005-05-21 00:18:37 +01001045 case AUDIT_USER:
Robert P. J. Day039b6b32007-05-08 00:29:20 -07001046 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
1047 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
Eric W. Biederman90f62cf2014-04-23 14:29:27 -07001048 if (!netlink_capable(skb, CAP_AUDIT_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 err = -EPERM;
1050 break;
1051 default: /* bad msg */
1052 err = -EINVAL;
1053 }
1054
1055 return err;
1056}
1057
Paul Moore233a6862015-11-04 08:23:52 -05001058static void audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
Eric Paris50397bd2008-01-07 18:14:19 -05001059{
Eric Parisdc9eb692013-04-19 13:23:09 -04001060 uid_t uid = from_kuid(&init_user_ns, current_uid());
Richard Guy Briggsf1dc4862013-12-11 13:52:26 -05001061 pid_t pid = task_tgid_nr(current);
Eric Paris50397bd2008-01-07 18:14:19 -05001062
Tyler Hicks0868a5e2013-07-25 18:02:55 -07001063 if (!audit_enabled && msg_type != AUDIT_USER_AVC) {
Eric Paris50397bd2008-01-07 18:14:19 -05001064 *ab = NULL;
Paul Moore233a6862015-11-04 08:23:52 -05001065 return;
Eric Paris50397bd2008-01-07 18:14:19 -05001066 }
1067
1068 *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
Kees Cook0644ec02013-01-11 14:32:07 -08001069 if (unlikely(!*ab))
Paul Moore233a6862015-11-04 08:23:52 -05001070 return;
Richard Guy Briggsf1dc4862013-12-11 13:52:26 -05001071 audit_log_format(*ab, "pid=%d uid=%u", pid, uid);
Eric Paris4d3fb702013-04-30 09:53:34 -04001072 audit_log_session_info(*ab);
Eric Parisb122c372013-04-19 15:00:33 -04001073 audit_log_task_context(*ab);
Eric Paris50397bd2008-01-07 18:14:19 -05001074}
1075
Eric Parisb0fed402013-05-22 12:54:49 -04001076int is_audit_feature_set(int i)
1077{
1078 return af.features & AUDIT_FEATURE_TO_MASK(i);
1079}
1080
1081
1082static int audit_get_feature(struct sk_buff *skb)
1083{
1084 u32 seq;
1085
1086 seq = nlmsg_hdr(skb)->nlmsg_seq;
1087
Richard Guy Briggs9ef91512014-08-24 20:37:52 -04001088 audit_send_reply(skb, seq, AUDIT_GET_FEATURE, 0, 0, &af, sizeof(af));
Eric Parisb0fed402013-05-22 12:54:49 -04001089
1090 return 0;
1091}
1092
1093static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature,
1094 u32 old_lock, u32 new_lock, int res)
1095{
1096 struct audit_buffer *ab;
1097
Gao fengb6c50fe2013-11-01 19:34:43 +08001098 if (audit_enabled == AUDIT_OFF)
1099 return;
1100
Eric Parisb0fed402013-05-22 12:54:49 -04001101 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE);
Richard Guy Briggs4a856ad2018-02-21 04:30:07 -05001102 if (!ab)
1103 return;
Richard Guy Briggsad2ac262014-01-07 13:08:41 -05001104 audit_log_task_info(ab, current);
Richard Guy Briggs897f1ac2014-10-30 11:22:53 -04001105 audit_log_format(ab, " feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d",
Eric Parisb0fed402013-05-22 12:54:49 -04001106 audit_feature_names[which], !!old_feature, !!new_feature,
1107 !!old_lock, !!new_lock, res);
1108 audit_log_end(ab);
1109}
1110
Paul Moorec7cba032020-02-24 16:38:57 -05001111static int audit_set_feature(struct audit_features *uaf)
Eric Parisb0fed402013-05-22 12:54:49 -04001112{
Eric Parisb0fed402013-05-22 12:54:49 -04001113 int i;
1114
Fabian Frederick6eed9b22014-06-03 22:05:10 +02001115 BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > ARRAY_SIZE(audit_feature_names));
Eric Parisb0fed402013-05-22 12:54:49 -04001116
1117 /* if there is ever a version 2 we should handle that here */
1118
1119 for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
1120 u32 feature = AUDIT_FEATURE_TO_MASK(i);
1121 u32 old_feature, new_feature, old_lock, new_lock;
1122
1123 /* if we are not changing this feature, move along */
1124 if (!(feature & uaf->mask))
1125 continue;
1126
1127 old_feature = af.features & feature;
1128 new_feature = uaf->features & feature;
1129 new_lock = (uaf->lock | af.lock) & feature;
1130 old_lock = af.lock & feature;
1131
1132 /* are we changing a locked feature? */
Gao feng4547b3b2013-11-01 19:34:44 +08001133 if (old_lock && (new_feature != old_feature)) {
Eric Parisb0fed402013-05-22 12:54:49 -04001134 audit_log_feature_change(i, old_feature, new_feature,
1135 old_lock, new_lock, 0);
1136 return -EPERM;
1137 }
1138 }
1139 /* nothing invalid, do the changes */
1140 for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
1141 u32 feature = AUDIT_FEATURE_TO_MASK(i);
1142 u32 old_feature, new_feature, old_lock, new_lock;
1143
1144 /* if we are not changing this feature, move along */
1145 if (!(feature & uaf->mask))
1146 continue;
1147
1148 old_feature = af.features & feature;
1149 new_feature = uaf->features & feature;
1150 old_lock = af.lock & feature;
1151 new_lock = (uaf->lock | af.lock) & feature;
1152
1153 if (new_feature != old_feature)
1154 audit_log_feature_change(i, old_feature, new_feature,
1155 old_lock, new_lock, 1);
1156
1157 if (new_feature)
1158 af.features |= feature;
1159 else
1160 af.features &= ~feature;
1161 af.lock |= new_lock;
1162 }
1163
1164 return 0;
1165}
1166
Paul Mooreb6c7c112017-05-02 10:16:05 -04001167static int audit_replace(struct pid *pid)
Richard Guy Briggs133e1e52016-01-25 18:04:15 -05001168{
Paul Mooreb6c7c112017-05-02 10:16:05 -04001169 pid_t pvnr;
Paul Moore5b523302017-03-21 11:26:35 -04001170 struct sk_buff *skb;
Richard Guy Briggs133e1e52016-01-25 18:04:15 -05001171
Paul Mooreb6c7c112017-05-02 10:16:05 -04001172 pvnr = pid_vnr(pid);
1173 skb = audit_make_reply(0, AUDIT_REPLACE, 0, 0, &pvnr, sizeof(pvnr));
Richard Guy Briggs133e1e52016-01-25 18:04:15 -05001174 if (!skb)
1175 return -ENOMEM;
Paul Moore5b523302017-03-21 11:26:35 -04001176 return auditd_send_unicast_skb(skb);
Richard Guy Briggs133e1e52016-01-25 18:04:15 -05001177}
1178
Chris Riches309b7142023-10-18 09:23:51 +00001179static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
1180 bool *ack)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181{
Eric Parisdc9eb692013-04-19 13:23:09 -04001182 u32 seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 void *data;
Paul Moorec7cba032020-02-24 16:38:57 -05001184 int data_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 int err;
Steve Grubbc0404992005-05-13 18:17:42 +01001186 struct audit_buffer *ab;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 u16 msg_type = nlh->nlmsg_type;
Al Viroe1396062006-05-25 10:19:47 -04001188 struct audit_sig_info *sig_data;
Eric Paris50397bd2008-01-07 18:14:19 -05001189 char *ctx = NULL;
Al Viroe1396062006-05-25 10:19:47 -04001190 u32 len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191
Darrel Goeddelc7bdb542006-06-27 13:26:11 -07001192 err = audit_netlink_ok(skb, msg_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 if (err)
1194 return err;
1195
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 seq = nlh->nlmsg_seq;
David S. Millerc64e66c2012-06-26 21:45:21 -07001197 data = nlmsg_data(nlh);
Paul Moorec7cba032020-02-24 16:38:57 -05001198 data_len = nlmsg_len(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199
1200 switch (msg_type) {
Richard Guy Briggs09f883a2013-09-18 09:32:24 -04001201 case AUDIT_GET: {
1202 struct audit_status s;
1203 memset(&s, 0, sizeof(s));
1204 s.enabled = audit_enabled;
1205 s.failure = audit_failure;
Paul Mooreb6c7c112017-05-02 10:16:05 -04001206 /* NOTE: use pid_vnr() so the PID is relative to the current
1207 * namespace */
Paul Moore48d0e022017-05-02 10:16:05 -04001208 s.pid = auditd_pid_vnr();
Richard Guy Briggs09f883a2013-09-18 09:32:24 -04001209 s.rate_limit = audit_rate_limit;
1210 s.backlog_limit = audit_backlog_limit;
1211 s.lost = atomic_read(&audit_lost);
Paul Mooreaf8b8242016-11-29 16:53:24 -05001212 s.backlog = skb_queue_len(&audit_queue);
Richard Guy Briggs0288d712014-11-17 15:51:01 -05001213 s.feature_bitmap = AUDIT_FEATURE_BITMAP_ALL;
Paul Moore31975422016-11-29 16:53:25 -05001214 s.backlog_wait_time = audit_backlog_wait_time;
Eric W. Biederman6f285b12014-02-28 19:44:55 -08001215 audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 break;
Richard Guy Briggs09f883a2013-09-18 09:32:24 -04001217 }
1218 case AUDIT_SET: {
1219 struct audit_status s;
1220 memset(&s, 0, sizeof(s));
1221 /* guard against past and future API changes */
Paul Moorec7cba032020-02-24 16:38:57 -05001222 memcpy(&s, data, min_t(size_t, sizeof(s), data_len));
Richard Guy Briggs09f883a2013-09-18 09:32:24 -04001223 if (s.mask & AUDIT_STATUS_ENABLED) {
1224 err = audit_set_enabled(s.enabled);
zhangxiliang20c6aaa2008-07-31 10:11:19 +08001225 if (err < 0)
1226 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 }
Richard Guy Briggs09f883a2013-09-18 09:32:24 -04001228 if (s.mask & AUDIT_STATUS_FAILURE) {
1229 err = audit_set_failure(s.failure);
zhangxiliang20c6aaa2008-07-31 10:11:19 +08001230 if (err < 0)
1231 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 }
Richard Guy Briggs09f883a2013-09-18 09:32:24 -04001233 if (s.mask & AUDIT_STATUS_PID) {
Paul Mooreb6c7c112017-05-02 10:16:05 -04001234 /* NOTE: we are using the vnr PID functions below
1235 * because the s.pid value is relative to the
1236 * namespace of the caller; at present this
1237 * doesn't matter much since you can really only
1238 * run auditd from the initial pid namespace, but
1239 * something to keep in mind if this changes */
1240 pid_t new_pid = s.pid;
Paul Moore5b523302017-03-21 11:26:35 -04001241 pid_t auditd_pid;
Paul Mooreb6c7c112017-05-02 10:16:05 -04001242 struct pid *req_pid = task_tgid(current);
1243
Steve Grubb4086f7c2017-10-17 18:29:22 -04001244 /* Sanity check - PID values must match. Setting
1245 * pid to 0 is how auditd ends auditing. */
1246 if (new_pid && (new_pid != pid_vnr(req_pid)))
Paul Mooreb6c7c112017-05-02 10:16:05 -04001247 return -EINVAL;
Eric Paris1a6b9f22008-01-07 17:09:31 -05001248
Paul Moore5b523302017-03-21 11:26:35 -04001249 /* test the auditd connection */
Paul Mooreb6c7c112017-05-02 10:16:05 -04001250 audit_replace(req_pid);
Paul Moore5b523302017-03-21 11:26:35 -04001251
Paul Moore48d0e022017-05-02 10:16:05 -04001252 auditd_pid = auditd_pid_vnr();
Steve Grubb4086f7c2017-10-17 18:29:22 -04001253 if (auditd_pid) {
1254 /* replacing a healthy auditd is not allowed */
1255 if (new_pid) {
1256 audit_log_config_change("audit_pid",
1257 new_pid, auditd_pid, 0);
1258 return -EEXIST;
1259 }
1260 /* only current auditd can unregister itself */
1261 if (pid_vnr(req_pid) != auditd_pid) {
1262 audit_log_config_change("audit_pid",
1263 new_pid, auditd_pid, 0);
1264 return -EACCES;
1265 }
Richard Guy Briggs935c9e72016-01-25 18:04:15 -05001266 }
Paul Moore5b523302017-03-21 11:26:35 -04001267
Richard Guy Briggs533c7b62016-12-13 10:03:01 -05001268 if (new_pid) {
Paul Moore5b523302017-03-21 11:26:35 -04001269 /* register a new auditd connection */
Paul Moore48d0e022017-05-02 10:16:05 -04001270 err = auditd_set(req_pid,
1271 NETLINK_CB(skb).portid,
Chris Riches309b7142023-10-18 09:23:51 +00001272 sock_net(NETLINK_CB(skb).sk),
1273 skb, ack);
Paul Moore48d0e022017-05-02 10:16:05 -04001274 if (audit_enabled != AUDIT_OFF)
1275 audit_log_config_change("audit_pid",
1276 new_pid,
1277 auditd_pid,
1278 err ? 0 : 1);
1279 if (err)
1280 return err;
1281
Paul Moore5b523302017-03-21 11:26:35 -04001282 /* try to process any backlog */
1283 wake_up_interruptible(&kauditd_wait);
Paul Moore48d0e022017-05-02 10:16:05 -04001284 } else {
1285 if (audit_enabled != AUDIT_OFF)
1286 audit_log_config_change("audit_pid",
1287 new_pid,
1288 auditd_pid, 1);
1289
Paul Moore5b523302017-03-21 11:26:35 -04001290 /* unregister the auditd connection */
Paul Moorec81be522017-06-12 09:35:24 -04001291 auditd_reset(NULL);
Paul Moore48d0e022017-05-02 10:16:05 -04001292 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 }
Richard Guy Briggs09f883a2013-09-18 09:32:24 -04001294 if (s.mask & AUDIT_STATUS_RATE_LIMIT) {
1295 err = audit_set_rate_limit(s.rate_limit);
zhangxiliang20c6aaa2008-07-31 10:11:19 +08001296 if (err < 0)
1297 return err;
1298 }
Richard Guy Briggs51cc83f2013-09-18 11:55:12 -04001299 if (s.mask & AUDIT_STATUS_BACKLOG_LIMIT) {
Richard Guy Briggs09f883a2013-09-18 09:32:24 -04001300 err = audit_set_backlog_limit(s.backlog_limit);
Richard Guy Briggs51cc83f2013-09-18 11:55:12 -04001301 if (err < 0)
1302 return err;
1303 }
Eric Paris3f0c5fa2014-01-13 16:49:28 -05001304 if (s.mask & AUDIT_STATUS_BACKLOG_WAIT_TIME) {
1305 if (sizeof(s) > (size_t)nlh->nlmsg_len)
1306 return -EINVAL;
Pranith Kumar724e7bf2015-03-11 14:08:19 -04001307 if (s.backlog_wait_time > 10*AUDIT_BACKLOG_WAIT_TIME)
Eric Paris3f0c5fa2014-01-13 16:49:28 -05001308 return -EINVAL;
1309 err = audit_set_backlog_wait_time(s.backlog_wait_time);
1310 if (err < 0)
1311 return err;
Richard Guy Briggs51cc83f2013-09-18 11:55:12 -04001312 }
Richard Guy Briggs92c82e82017-01-13 03:26:29 -05001313 if (s.mask == AUDIT_STATUS_LOST) {
1314 u32 lost = atomic_xchg(&audit_lost, 0);
1315
1316 audit_log_config_change("lost", 0, lost, 1);
1317 return lost;
1318 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 break;
Richard Guy Briggs09f883a2013-09-18 09:32:24 -04001320 }
Eric Parisb0fed402013-05-22 12:54:49 -04001321 case AUDIT_GET_FEATURE:
1322 err = audit_get_feature(skb);
1323 if (err)
1324 return err;
1325 break;
1326 case AUDIT_SET_FEATURE:
Paul Moorec7cba032020-02-24 16:38:57 -05001327 if (data_len < sizeof(struct audit_features))
1328 return -EINVAL;
1329 err = audit_set_feature(data);
Eric Parisb0fed402013-05-22 12:54:49 -04001330 if (err)
1331 return err;
1332 break;
Steve Grubb05474102005-05-21 00:18:37 +01001333 case AUDIT_USER:
Robert P. J. Day039b6b32007-05-08 00:29:20 -07001334 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
1335 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
David Woodhouse4a4cd632005-06-22 14:56:47 +01001336 if (!audit_enabled && msg_type != AUDIT_USER_AVC)
1337 return 0;
Paul Moore18441f72020-04-20 16:24:34 -04001338 /* exit early if there isn't at least one character to print */
1339 if (data_len < 2)
1340 return -EINVAL;
David Woodhouse0f45aa12005-06-19 19:35:50 +01001341
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001342 err = audit_filter(msg_type, AUDIT_FILTER_USER);
Richard Guy Briggs724e4fc2013-11-25 21:57:51 -05001343 if (err == 1) { /* match or error */
Paul Moorec7cba032020-02-24 16:38:57 -05001344 char *str = data;
1345
David Woodhouse4a4cd632005-06-22 14:56:47 +01001346 err = 0;
Miloslav Trmac522ed772007-07-15 23:40:56 -07001347 if (msg_type == AUDIT_USER_TTY) {
Peter Hurley37282a72016-01-09 22:55:31 -08001348 err = tty_audit_push();
Miloslav Trmac522ed772007-07-15 23:40:56 -07001349 if (err)
1350 break;
1351 }
Eric Parisdc9eb692013-04-19 13:23:09 -04001352 audit_log_common_recv_msg(&ab, msg_type);
Paul Moorec7cba032020-02-24 16:38:57 -05001353 if (msg_type != AUDIT_USER_TTY) {
1354 /* ensure NULL termination */
1355 str[data_len - 1] = '\0';
Richard Guy Briggsb50eba72013-09-16 18:20:42 -04001356 audit_log_format(ab, " msg='%.*s'",
1357 AUDIT_MESSAGE_TEXT_MAX,
Paul Moorec7cba032020-02-24 16:38:57 -05001358 str);
1359 } else {
Eric Parisf7616102013-04-11 11:25:00 -04001360 audit_log_format(ab, " data=");
Paul Moorec7cba032020-02-24 16:38:57 -05001361 if (data_len > 0 && str[data_len - 1] == '\0')
1362 data_len--;
1363 audit_log_n_untrustedstring(ab, str, data_len);
David Woodhouse4a4cd632005-06-22 14:56:47 +01001364 }
Eric Paris50397bd2008-01-07 18:14:19 -05001365 audit_log_end(ab);
David Woodhouse0f45aa12005-06-19 19:35:50 +01001366 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 break;
Amy Griffis93315ed2006-02-07 12:05:27 -05001368 case AUDIT_ADD_RULE:
1369 case AUDIT_DEL_RULE:
Paul Moorec7cba032020-02-24 16:38:57 -05001370 if (data_len < sizeof(struct audit_rule_data))
Amy Griffis93315ed2006-02-07 12:05:27 -05001371 return -EINVAL;
Eric Paris1a6b9f22008-01-07 17:09:31 -05001372 if (audit_enabled == AUDIT_LOCKED) {
Eric Parisdc9eb692013-04-19 13:23:09 -04001373 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
1374 audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled);
Eric Paris50397bd2008-01-07 18:14:19 -05001375 audit_log_end(ab);
Steve Grubb6a01b072007-01-19 14:39:55 -05001376 return -EPERM;
1377 }
Paul Moorec7cba032020-02-24 16:38:57 -05001378 err = audit_rule_change(msg_type, seq, data, data_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 break;
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001380 case AUDIT_LIST_RULES:
Eric W. Biederman6f285b12014-02-28 19:44:55 -08001381 err = audit_list_rules_send(skb, seq);
Richard Guy Briggsce0d9f02013-11-20 14:01:53 -05001382 break;
Al Viro74c3cbe2007-07-22 08:04:18 -04001383 case AUDIT_TRIM:
1384 audit_trim_trees();
Eric Parisdc9eb692013-04-19 13:23:09 -04001385 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
Al Viro74c3cbe2007-07-22 08:04:18 -04001386 audit_log_format(ab, " op=trim res=1");
1387 audit_log_end(ab);
1388 break;
1389 case AUDIT_MAKE_EQUIV: {
1390 void *bufp = data;
1391 u32 sizes[2];
Paul Moorec7cba032020-02-24 16:38:57 -05001392 size_t msglen = data_len;
Al Viro74c3cbe2007-07-22 08:04:18 -04001393 char *old, *new;
1394
1395 err = -EINVAL;
Harvey Harrison7719e432008-04-27 02:39:56 -07001396 if (msglen < 2 * sizeof(u32))
Al Viro74c3cbe2007-07-22 08:04:18 -04001397 break;
1398 memcpy(sizes, bufp, 2 * sizeof(u32));
1399 bufp += 2 * sizeof(u32);
Harvey Harrison7719e432008-04-27 02:39:56 -07001400 msglen -= 2 * sizeof(u32);
1401 old = audit_unpack_string(&bufp, &msglen, sizes[0]);
Al Viro74c3cbe2007-07-22 08:04:18 -04001402 if (IS_ERR(old)) {
1403 err = PTR_ERR(old);
1404 break;
1405 }
Harvey Harrison7719e432008-04-27 02:39:56 -07001406 new = audit_unpack_string(&bufp, &msglen, sizes[1]);
Al Viro74c3cbe2007-07-22 08:04:18 -04001407 if (IS_ERR(new)) {
1408 err = PTR_ERR(new);
1409 kfree(old);
1410 break;
1411 }
1412 /* OK, here comes... */
1413 err = audit_tag_tree(old, new);
1414
Eric Parisdc9eb692013-04-19 13:23:09 -04001415 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
Eric Paris50397bd2008-01-07 18:14:19 -05001416
Al Viro74c3cbe2007-07-22 08:04:18 -04001417 audit_log_format(ab, " op=make_equiv old=");
1418 audit_log_untrustedstring(ab, old);
1419 audit_log_format(ab, " new=");
1420 audit_log_untrustedstring(ab, new);
1421 audit_log_format(ab, " res=%d", !err);
1422 audit_log_end(ab);
1423 kfree(old);
1424 kfree(new);
1425 break;
1426 }
Steve Grubbc2f0c7c2005-05-06 12:38:39 +01001427 case AUDIT_SIGNAL_INFO:
Eric Paris939cbf22009-09-23 13:46:00 -04001428 len = 0;
1429 if (audit_sig_sid) {
1430 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
1431 if (err)
1432 return err;
1433 }
Al Viroe1396062006-05-25 10:19:47 -04001434 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
1435 if (!sig_data) {
Eric Paris939cbf22009-09-23 13:46:00 -04001436 if (audit_sig_sid)
1437 security_release_secctx(ctx, len);
Al Viroe1396062006-05-25 10:19:47 -04001438 return -ENOMEM;
1439 }
Eric W. Biedermancca080d2012-02-07 16:53:48 -08001440 sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
Al Viroe1396062006-05-25 10:19:47 -04001441 sig_data->pid = audit_sig_pid;
Eric Paris939cbf22009-09-23 13:46:00 -04001442 if (audit_sig_sid) {
1443 memcpy(sig_data->ctx, ctx, len);
1444 security_release_secctx(ctx, len);
1445 }
Eric W. Biederman6f285b12014-02-28 19:44:55 -08001446 audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
1447 sig_data, sizeof(*sig_data) + len);
Al Viroe1396062006-05-25 10:19:47 -04001448 kfree(sig_data);
Steve Grubbc2f0c7c2005-05-06 12:38:39 +01001449 break;
Miloslav Trmac522ed772007-07-15 23:40:56 -07001450 case AUDIT_TTY_GET: {
1451 struct audit_tty_status s;
Peter Hurley2e28d382016-01-09 22:55:33 -08001452 unsigned int t;
Miloslav Trmac522ed772007-07-15 23:40:56 -07001453
Peter Hurley2e28d382016-01-09 22:55:33 -08001454 t = READ_ONCE(current->signal->audit_tty);
1455 s.enabled = t & AUDIT_TTY_ENABLE;
1456 s.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD);
Thomas Gleixner20703202009-12-09 14:19:35 +00001457
Eric W. Biederman6f285b12014-02-28 19:44:55 -08001458 audit_send_reply(skb, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
Miloslav Trmac522ed772007-07-15 23:40:56 -07001459 break;
1460 }
1461 case AUDIT_TTY_SET: {
Richard Guy Briggsa06e56b2013-11-15 11:29:02 -05001462 struct audit_tty_status s, old;
Richard Guy Briggsa06e56b2013-11-15 11:29:02 -05001463 struct audit_buffer *ab;
Peter Hurley2e28d382016-01-09 22:55:33 -08001464 unsigned int t;
Miloslav Trmac522ed772007-07-15 23:40:56 -07001465
Richard Guy Briggs46e959e2013-05-03 14:03:50 -04001466 memset(&s, 0, sizeof(s));
1467 /* guard against past and future API changes */
Paul Moorec7cba032020-02-24 16:38:57 -05001468 memcpy(&s, data, min_t(size_t, sizeof(s), data_len));
Eric Paris0e23bac2014-01-13 21:12:34 -05001469 /* check if new data is valid */
1470 if ((s.enabled != 0 && s.enabled != 1) ||
1471 (s.log_passwd != 0 && s.log_passwd != 1))
1472 err = -EINVAL;
1473
Peter Hurley2e28d382016-01-09 22:55:33 -08001474 if (err)
1475 t = READ_ONCE(current->signal->audit_tty);
1476 else {
1477 t = s.enabled | (-s.log_passwd & AUDIT_TTY_LOG_PASSWD);
1478 t = xchg(&current->signal->audit_tty, t);
Eric Paris0e23bac2014-01-13 21:12:34 -05001479 }
Peter Hurley2e28d382016-01-09 22:55:33 -08001480 old.enabled = t & AUDIT_TTY_ENABLE;
1481 old.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD);
Eric Paris0e23bac2014-01-13 21:12:34 -05001482
Richard Guy Briggsa06e56b2013-11-15 11:29:02 -05001483 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
Eric Paris1ce319f2014-01-13 21:16:59 -05001484 audit_log_format(ab, " op=tty_set old-enabled=%d new-enabled=%d"
1485 " old-log_passwd=%d new-log_passwd=%d res=%d",
1486 old.enabled, s.enabled, old.log_passwd,
1487 s.log_passwd, !err);
Richard Guy Briggsa06e56b2013-11-15 11:29:02 -05001488 audit_log_end(ab);
Miloslav Trmac522ed772007-07-15 23:40:56 -07001489 break;
1490 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 default:
1492 err = -EINVAL;
1493 break;
1494 }
1495
1496 return err < 0 ? err : 0;
1497}
1498
Paul Moorea9d16202017-05-02 10:16:05 -04001499/**
1500 * audit_receive - receive messages from a netlink control socket
1501 * @skb: the message buffer
1502 *
1503 * Parse the provided skb and deal with any messages that may be present,
1504 * malformed skbs are discarded.
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001505 */
Chris Riches309b7142023-10-18 09:23:51 +00001506static void audit_receive(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507{
Eric Parisea7ae602009-06-11 14:31:35 -04001508 struct nlmsghdr *nlh;
Chris Riches309b7142023-10-18 09:23:51 +00001509 bool ack;
Eric Parisea7ae602009-06-11 14:31:35 -04001510 /*
Hong zhi guo94191212013-03-27 06:49:06 +00001511 * len MUST be signed for nlmsg_next to be able to dec it below 0
Eric Parisea7ae602009-06-11 14:31:35 -04001512 * if the nlmsg_len was not aligned
1513 */
1514 int len;
1515 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
Eric Parisea7ae602009-06-11 14:31:35 -04001517 nlh = nlmsg_hdr(skb);
1518 len = skb->len;
1519
Paul Moorea9d16202017-05-02 10:16:05 -04001520 mutex_lock(&audit_cmd_mutex);
Hong zhi guo94191212013-03-27 06:49:06 +00001521 while (nlmsg_ok(nlh, len)) {
Chris Riches309b7142023-10-18 09:23:51 +00001522 ack = nlh->nlmsg_flags & NLM_F_ACK;
1523 err = audit_receive_msg(skb, nlh, &ack);
1524
1525 /* send an ack if the user asked for one and audit_receive_msg
1526 * didn't already do it, or if there was an error. */
1527 if (ack || err)
Johannes Berg2d4bc932017-04-12 14:34:04 +02001528 netlink_ack(skb, nlh, err, NULL);
Eric Parisea7ae602009-06-11 14:31:35 -04001529
Alexandru Copot2851da52013-03-28 23:31:29 +02001530 nlh = nlmsg_next(nlh, &len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 }
Amy Griffisf368c07d2006-04-07 16:55:56 -04001532 mutex_unlock(&audit_cmd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533}
1534
Richard Guy Briggs3a101b82014-04-22 21:31:56 -04001535/* Run custom bind function on netlink socket group connect or bind requests. */
Johannes Berg023e2cf2014-12-23 21:00:06 +01001536static int audit_bind(struct net *net, int group)
Richard Guy Briggs3a101b82014-04-22 21:31:56 -04001537{
1538 if (!capable(CAP_AUDIT_READ))
1539 return -EPERM;
1540
1541 return 0;
1542}
1543
Richard Guy Briggs33faba72013-07-16 13:18:45 -04001544static int __net_init audit_net_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545{
Pablo Neira Ayusoa31f2d12012-06-29 06:15:21 +00001546 struct netlink_kernel_cfg cfg = {
1547 .input = audit_receive,
Richard Guy Briggs3a101b82014-04-22 21:31:56 -04001548 .bind = audit_bind,
Richard Guy Briggs451f9212014-04-22 21:31:57 -04001549 .flags = NL_CFG_F_NONROOT_RECV,
1550 .groups = AUDIT_NLGRP_MAX,
Pablo Neira Ayusoa31f2d12012-06-29 06:15:21 +00001551 };
Amy Griffisf368c07d2006-04-07 16:55:56 -04001552
Richard Guy Briggs33faba72013-07-16 13:18:45 -04001553 struct audit_net *aunet = net_generic(net, audit_net_id);
1554
Paul Moore5b523302017-03-21 11:26:35 -04001555 aunet->sk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg);
1556 if (aunet->sk == NULL) {
Richard Guy Briggs33faba72013-07-16 13:18:45 -04001557 audit_panic("cannot initialize netlink socket in namespace");
Gao feng11ee39e2013-12-17 11:10:41 +08001558 return -ENOMEM;
1559 }
Paul Moore75fdb752021-12-09 11:46:07 -05001560 /* limit the timeout in case auditd is blocked/stopped */
1561 aunet->sk->sk_sndtimeo = HZ / 10;
Paul Moore5b523302017-03-21 11:26:35 -04001562
Richard Guy Briggs33faba72013-07-16 13:18:45 -04001563 return 0;
1564}
1565
1566static void __net_exit audit_net_exit(struct net *net)
1567{
1568 struct audit_net *aunet = net_generic(net, audit_net_id);
Richard Guy Briggs33faba72013-07-16 13:18:45 -04001569
Paul Moore48d0e022017-05-02 10:16:05 -04001570 /* NOTE: you would think that we would want to check the auditd
1571 * connection and potentially reset it here if it lives in this
1572 * namespace, but since the auditd connection tracking struct holds a
1573 * reference to this namespace (see auditd_set()) we are only ever
1574 * going to get here after that connection has been released */
Paul Moore5b523302017-03-21 11:26:35 -04001575
1576 netlink_kernel_release(aunet->sk);
Richard Guy Briggs33faba72013-07-16 13:18:45 -04001577}
1578
Richard Guy Briggs86268772013-07-16 13:18:45 -04001579static struct pernet_operations audit_net_ops __net_initdata = {
Richard Guy Briggs33faba72013-07-16 13:18:45 -04001580 .init = audit_net_init,
1581 .exit = audit_net_exit,
1582 .id = &audit_net_id,
1583 .size = sizeof(struct audit_net),
1584};
1585
1586/* Initialize audit support at boot time. */
1587static int __init audit_init(void)
1588{
1589 int i;
1590
Eric Parisa3f07112008-11-05 12:47:09 -05001591 if (audit_initialized == AUDIT_DISABLED)
1592 return 0;
1593
Paul Moore8cc96382017-05-02 10:16:05 -04001594 audit_buffer_cache = kmem_cache_create("audit_buffer",
1595 sizeof(struct audit_buffer),
1596 0, SLAB_PANIC, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597
Paul Mooreaf8b8242016-11-29 16:53:24 -05001598 skb_queue_head_init(&audit_queue);
Paul Moorec6480202016-11-29 16:53:25 -05001599 skb_queue_head_init(&audit_retry_queue);
Paul Mooreaf8b8242016-11-29 16:53:24 -05001600 skb_queue_head_init(&audit_hold_queue);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -06001601
Amy Griffisf368c07d2006-04-07 16:55:56 -04001602 for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
1603 INIT_LIST_HEAD(&audit_inode_hash[i]);
Amy Griffisf368c07d2006-04-07 16:55:56 -04001604
Paul Moore5b523302017-03-21 11:26:35 -04001605 pr_info("initializing netlink subsys (%s)\n",
1606 audit_default ? "enabled" : "disabled");
1607 register_pernet_subsys(&audit_net_ops);
1608
1609 audit_initialized = AUDIT_INITIALIZED;
Paul Moore5b523302017-03-21 11:26:35 -04001610
Paul Moore6c925562016-11-29 16:53:23 -05001611 kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
1612 if (IS_ERR(kauditd_task)) {
1613 int err = PTR_ERR(kauditd_task);
1614 panic("audit: failed to start the kauditd thread (%d)\n", err);
1615 }
1616
Steve Grubb7c397d02016-12-14 15:59:46 -05001617 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL,
1618 "state=initialized audit_enabled=%u res=1",
1619 audit_enabled);
Paul Moore6c925562016-11-29 16:53:23 -05001620
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 return 0;
1622}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623__initcall(audit_init);
1624
1625/* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
1626static int __init audit_enable(char *str)
1627{
1628 audit_default = !!simple_strtol(str, NULL, 0);
Eric Parisa3f07112008-11-05 12:47:09 -05001629 if (!audit_default)
1630 audit_initialized = AUDIT_DISABLED;
Paul Moore0ad0bb62017-09-01 09:44:34 -04001631 audit_enabled = audit_default;
1632 audit_ever_enabled = !!audit_enabled;
Eric Parisa3f07112008-11-05 12:47:09 -05001633
Joe Perchesd957f7b2014-01-14 10:33:12 -08001634 pr_info("%s\n", audit_default ?
Gao fengd3ca0342013-10-31 14:31:01 +08001635 "enabled (after initialization)" : "disabled (until reboot)");
Eric Parisa3f07112008-11-05 12:47:09 -05001636
OGAWA Hirofumi9b410462006-03-31 02:30:33 -08001637 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639__setup("audit=", audit_enable);
1640
Richard Guy Briggsf910fde2013-09-17 12:34:52 -04001641/* Process kernel command-line parameter at boot time.
1642 * audit_backlog_limit=<n> */
1643static int __init audit_backlog_limit_set(char *str)
1644{
Joe Perches3e1d0bb2014-01-14 10:33:13 -08001645 u32 audit_backlog_limit_arg;
Joe Perchesd957f7b2014-01-14 10:33:12 -08001646
Richard Guy Briggsf910fde2013-09-17 12:34:52 -04001647 pr_info("audit_backlog_limit: ");
Joe Perches3e1d0bb2014-01-14 10:33:13 -08001648 if (kstrtouint(str, 0, &audit_backlog_limit_arg)) {
1649 pr_cont("using default of %u, unable to parse %s\n",
Joe Perchesd957f7b2014-01-14 10:33:12 -08001650 audit_backlog_limit, str);
Richard Guy Briggsf910fde2013-09-17 12:34:52 -04001651 return 1;
1652 }
Joe Perches3e1d0bb2014-01-14 10:33:13 -08001653
1654 audit_backlog_limit = audit_backlog_limit_arg;
Joe Perchesd957f7b2014-01-14 10:33:12 -08001655 pr_cont("%d\n", audit_backlog_limit);
Richard Guy Briggsf910fde2013-09-17 12:34:52 -04001656
1657 return 1;
1658}
1659__setup("audit_backlog_limit=", audit_backlog_limit_set);
1660
Chris Wright16e19042005-05-06 15:53:34 +01001661static void audit_buffer_free(struct audit_buffer *ab)
1662{
Chris Wright8fc61152005-05-06 15:54:17 +01001663 if (!ab)
1664 return;
1665
Markus Elfringd865e572016-01-13 09:18:55 -05001666 kfree_skb(ab->skb);
Paul Moore8cc96382017-05-02 10:16:05 -04001667 kmem_cache_free(audit_buffer_cache, ab);
Chris Wright16e19042005-05-06 15:53:34 +01001668}
1669
Paul Moore8cc96382017-05-02 10:16:05 -04001670static struct audit_buffer *audit_buffer_alloc(struct audit_context *ctx,
1671 gfp_t gfp_mask, int type)
Chris Wright16e19042005-05-06 15:53:34 +01001672{
Paul Moore8cc96382017-05-02 10:16:05 -04001673 struct audit_buffer *ab;
Chris Wright16e19042005-05-06 15:53:34 +01001674
Paul Moore8cc96382017-05-02 10:16:05 -04001675 ab = kmem_cache_alloc(audit_buffer_cache, gfp_mask);
1676 if (!ab)
1677 return NULL;
Eric Parisee080e62009-06-11 14:31:35 -04001678
1679 ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
1680 if (!ab->skb)
David S. Millerc64e66c2012-06-26 21:45:21 -07001681 goto err;
Paul Moore8cc96382017-05-02 10:16:05 -04001682 if (!nlmsg_put(ab->skb, 0, 0, type, 0, 0))
1683 goto err;
Eric Parisee080e62009-06-11 14:31:35 -04001684
Paul Moore8cc96382017-05-02 10:16:05 -04001685 ab->ctx = ctx;
1686 ab->gfp_mask = gfp_mask;
Eric Parisee080e62009-06-11 14:31:35 -04001687
Chris Wright16e19042005-05-06 15:53:34 +01001688 return ab;
Eric Parisee080e62009-06-11 14:31:35 -04001689
Chris Wright8fc61152005-05-06 15:54:17 +01001690err:
1691 audit_buffer_free(ab);
1692 return NULL;
Chris Wright16e19042005-05-06 15:53:34 +01001693}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001695/**
1696 * audit_serial - compute a serial number for the audit record
1697 *
1698 * Compute a serial number for the audit record. Audit records are
David Woodhousebfb44962005-05-21 21:08:09 +01001699 * written to user-space as soon as they are generated, so a complete
1700 * audit record may be written in several pieces. The timestamp of the
1701 * record and this serial number are used by the user-space tools to
1702 * determine which pieces belong to the same audit record. The
1703 * (timestamp,serial) tuple is unique for each syscall and is live from
1704 * syscall entry to syscall exit.
1705 *
David Woodhousebfb44962005-05-21 21:08:09 +01001706 * NOTE: Another possibility is to store the formatted records off the
1707 * audit context (for those records that have a context), and emit them
1708 * all at syscall exit. However, this could delay the reporting of
1709 * significant errors until syscall exit (or never, if the system
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001710 * halts).
1711 */
David Woodhousebfb44962005-05-21 21:08:09 +01001712unsigned int audit_serial(void)
1713{
Richard Guy Briggs01478d72014-06-13 18:22:00 -04001714 static atomic_t serial = ATOMIC_INIT(0);
David Woodhousebfb44962005-05-21 21:08:09 +01001715
Richard Guy Briggs01478d72014-06-13 18:22:00 -04001716 return atomic_add_return(1, &serial);
David Woodhousebfb44962005-05-21 21:08:09 +01001717}
1718
Daniel Walker5600b892007-10-18 03:06:10 -07001719static inline void audit_get_stamp(struct audit_context *ctx,
Deepa Dinamani2115bb22017-05-02 10:16:05 -04001720 struct timespec64 *t, unsigned int *serial)
David Woodhousebfb44962005-05-21 21:08:09 +01001721{
Al Viro48887e62008-12-06 01:05:50 -05001722 if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
Mel Gormane832bf42017-07-04 13:11:43 +01001723 *t = current_kernel_time64();
David Woodhousebfb44962005-05-21 21:08:09 +01001724 *serial = audit_serial();
1725 }
1726}
1727
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001728/**
1729 * audit_log_start - obtain an audit buffer
1730 * @ctx: audit_context (may be NULL)
1731 * @gfp_mask: type of allocation
1732 * @type: audit message type
1733 *
1734 * Returns audit_buffer pointer on success or NULL on error.
1735 *
1736 * Obtain an audit buffer. This routine does locking to obtain the
1737 * audit buffer, but then no locking is required for calls to
1738 * audit_log_*format. If the task (ctx) is a task that is currently in a
1739 * syscall, then the syscall is marked as auditable and an audit record
1740 * will be written at syscall exit. If there is no associated task, then
1741 * task context (ctx) should be NULL.
1742 */
Al Viro9796fdd2005-10-21 03:22:03 -04001743struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
David Woodhouse9ad9ad32005-06-22 15:04:33 +01001744 int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745{
Paul Moore31975422016-11-29 16:53:25 -05001746 struct audit_buffer *ab;
Deepa Dinamani2115bb22017-05-02 10:16:05 -04001747 struct timespec64 t;
Kees Cookd6862762020-06-03 13:09:38 -07001748 unsigned int serial;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749
Eric Parisa3f07112008-11-05 12:47:09 -05001750 if (audit_initialized != AUDIT_INITIALIZED)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 return NULL;
1752
Richard Guy Briggs86b2efb2016-06-24 16:35:46 -04001753 if (unlikely(!audit_filter(type, AUDIT_FILTER_TYPE)))
Dustin Kirklandc8edc802005-11-03 16:12:36 +00001754 return NULL;
1755
Paul Moore5b523302017-03-21 11:26:35 -04001756 /* NOTE: don't ever fail/sleep on these two conditions:
Paul Moorea09cfa42016-11-29 16:53:26 -05001757 * 1. auditd generated record - since we need auditd to drain the
1758 * queue; also, when we are checking for auditd, compare PIDs using
1759 * task_tgid_vnr() since auditd_pid is set in audit_receive_msg()
1760 * using a PID anchored in the caller's namespace
Paul Moore5b523302017-03-21 11:26:35 -04001761 * 2. generator holding the audit_cmd_mutex - we don't want to block
1762 * while holding the mutex */
1763 if (!(auditd_test_task(current) ||
1764 (current == __mutex_owner(&audit_cmd_mutex)))) {
1765 long stime = audit_backlog_wait_time;
David Woodhouse9ad9ad32005-06-22 15:04:33 +01001766
Paul Moore31975422016-11-29 16:53:25 -05001767 while (audit_backlog_limit &&
1768 (skb_queue_len(&audit_queue) > audit_backlog_limit)) {
1769 /* wake kauditd to try and flush the queue */
1770 wake_up_interruptible(&kauditd_wait);
David Woodhouseac4cec42005-07-02 14:08:48 +01001771
Paul Moore31975422016-11-29 16:53:25 -05001772 /* sleep if we are allowed and we haven't exhausted our
1773 * backlog wait limit */
Paul Moore5b523302017-03-21 11:26:35 -04001774 if (gfpflags_allow_blocking(gfp_mask) && (stime > 0)) {
Paul Moore31975422016-11-29 16:53:25 -05001775 DECLARE_WAITQUEUE(wait, current);
1776
1777 add_wait_queue_exclusive(&audit_backlog_wait,
1778 &wait);
1779 set_current_state(TASK_UNINTERRUPTIBLE);
Paul Moore5b523302017-03-21 11:26:35 -04001780 stime = schedule_timeout(stime);
Paul Moore31975422016-11-29 16:53:25 -05001781 remove_wait_queue(&audit_backlog_wait, &wait);
1782 } else {
1783 if (audit_rate_check() && printk_ratelimit())
1784 pr_warn("audit_backlog=%d > audit_backlog_limit=%d\n",
1785 skb_queue_len(&audit_queue),
1786 audit_backlog_limit);
1787 audit_log_lost("backlog limit exceeded");
1788 return NULL;
Konstantin Khlebnikov8ac1c8d2013-09-24 15:27:42 -07001789 }
David Woodhouse9ad9ad32005-06-22 15:04:33 +01001790 }
David Woodhousefb19b4c2005-05-19 14:55:56 +01001791 }
1792
David Woodhouse9ad9ad32005-06-22 15:04:33 +01001793 ab = audit_buffer_alloc(ctx, gfp_mask, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 if (!ab) {
1795 audit_log_lost("out of memory in audit_log_start");
1796 return NULL;
1797 }
1798
David Woodhousebfb44962005-05-21 21:08:09 +01001799 audit_get_stamp(ab->ctx, &t, &serial);
Deepa Dinamani2115bb22017-05-02 10:16:05 -04001800 audit_log_format(ab, "audit(%llu.%03lu:%u): ",
1801 (unsigned long long)t.tv_sec, t.tv_nsec/1000000, serial);
Paul Moore31975422016-11-29 16:53:25 -05001802
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 return ab;
1804}
1805
Chris Wright8fc61152005-05-06 15:54:17 +01001806/**
Chris Wright5ac52f32005-05-06 15:54:53 +01001807 * audit_expand - expand skb in the audit buffer
Chris Wright8fc61152005-05-06 15:54:17 +01001808 * @ab: audit_buffer
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001809 * @extra: space to add at tail of the skb
Chris Wright8fc61152005-05-06 15:54:17 +01001810 *
1811 * Returns 0 (no space) on failed expansion, or available space if
1812 * successful.
1813 */
David Woodhousee3b926b2005-05-10 18:56:08 +01001814static inline int audit_expand(struct audit_buffer *ab, int extra)
Chris Wright8fc61152005-05-06 15:54:17 +01001815{
Chris Wright5ac52f32005-05-06 15:54:53 +01001816 struct sk_buff *skb = ab->skb;
Herbert Xu406a1d82008-01-28 20:47:09 -08001817 int oldtail = skb_tailroom(skb);
1818 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
1819 int newtail = skb_tailroom(skb);
1820
Chris Wright5ac52f32005-05-06 15:54:53 +01001821 if (ret < 0) {
1822 audit_log_lost("out of memory in audit_expand");
Chris Wright8fc61152005-05-06 15:54:17 +01001823 return 0;
Chris Wright5ac52f32005-05-06 15:54:53 +01001824 }
Herbert Xu406a1d82008-01-28 20:47:09 -08001825
1826 skb->truesize += newtail - oldtail;
1827 return newtail;
Chris Wright8fc61152005-05-06 15:54:17 +01001828}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001830/*
1831 * Format an audit message into the audit buffer. If there isn't enough
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 * room in the audit buffer, more room will be allocated and vsnprint
1833 * will be called a second time. Currently, we assume that a printk
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001834 * can't format message larger than 1024 bytes, so we don't either.
1835 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
1837 va_list args)
1838{
1839 int len, avail;
Chris Wright5ac52f32005-05-06 15:54:53 +01001840 struct sk_buff *skb;
David Woodhouseeecb0a72005-05-10 18:58:51 +01001841 va_list args2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842
1843 if (!ab)
1844 return;
1845
Chris Wright5ac52f32005-05-06 15:54:53 +01001846 BUG_ON(!ab->skb);
1847 skb = ab->skb;
1848 avail = skb_tailroom(skb);
1849 if (avail == 0) {
David Woodhousee3b926b2005-05-10 18:56:08 +01001850 avail = audit_expand(ab, AUDIT_BUFSIZ);
Chris Wright8fc61152005-05-06 15:54:17 +01001851 if (!avail)
1852 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 }
David Woodhouseeecb0a72005-05-10 18:58:51 +01001854 va_copy(args2, args);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001855 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 if (len >= avail) {
1857 /* The printk buffer is 1024 bytes long, so if we get
1858 * here and AUDIT_BUFSIZ is at least 1024, then we can
1859 * log everything that printk could have logged. */
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001860 avail = audit_expand(ab,
1861 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
Chris Wright8fc61152005-05-06 15:54:17 +01001862 if (!avail)
Jesper Juhla0e86bd2012-01-08 22:44:29 +01001863 goto out_va_end;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001864 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865 }
Steve Grubb168b7172005-05-19 10:24:22 +01001866 if (len > 0)
1867 skb_put(skb, len);
Jesper Juhla0e86bd2012-01-08 22:44:29 +01001868out_va_end:
1869 va_end(args2);
Chris Wright8fc61152005-05-06 15:54:17 +01001870out:
1871 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872}
1873
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001874/**
1875 * audit_log_format - format a message into the audit buffer.
1876 * @ab: audit_buffer
1877 * @fmt: format string
1878 * @...: optional parameters matching @fmt string
1879 *
1880 * All the work is done in audit_log_vformat.
1881 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
1883{
1884 va_list args;
1885
1886 if (!ab)
1887 return;
1888 va_start(args, fmt);
1889 audit_log_vformat(ab, fmt, args);
1890 va_end(args);
1891}
1892
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001893/**
Geliang Tang196a5082017-08-07 21:44:24 +08001894 * audit_log_n_hex - convert a buffer to hex and append it to the audit skb
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001895 * @ab: the audit_buffer
1896 * @buf: buffer to convert to hex
1897 * @len: length of @buf to be converted
1898 *
1899 * No return value; failure to expand is silently ignored.
1900 *
1901 * This function will take the passed buf and convert it into a string of
1902 * ascii hex digits. The new string is placed onto the skb.
1903 */
Eric Parisb556f8a2008-04-18 10:12:59 -04001904void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
Steve Grubb168b7172005-05-19 10:24:22 +01001905 size_t len)
83c7d092005-04-29 15:54:44 +01001906{
Steve Grubb168b7172005-05-19 10:24:22 +01001907 int i, avail, new_len;
1908 unsigned char *ptr;
1909 struct sk_buff *skb;
83c7d092005-04-29 15:54:44 +01001910
Amy Griffis8ef2d302006-09-07 17:03:02 -04001911 if (!ab)
1912 return;
1913
Steve Grubb168b7172005-05-19 10:24:22 +01001914 BUG_ON(!ab->skb);
1915 skb = ab->skb;
1916 avail = skb_tailroom(skb);
1917 new_len = len<<1;
1918 if (new_len >= avail) {
1919 /* Round the buffer request up to the next multiple */
1920 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
1921 avail = audit_expand(ab, new_len);
1922 if (!avail)
1923 return;
1924 }
1925
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001926 ptr = skb_tail_pointer(skb);
Joe Perchesb8dbc322014-01-13 23:31:27 -08001927 for (i = 0; i < len; i++)
1928 ptr = hex_byte_pack_upper(ptr, buf[i]);
Steve Grubb168b7172005-05-19 10:24:22 +01001929 *ptr = 0;
1930 skb_put(skb, len << 1); /* new string is twice the old string */
83c7d092005-04-29 15:54:44 +01001931}
1932
Amy Griffis9c937dc2006-06-08 23:19:31 -04001933/*
1934 * Format a string of no more than slen characters into the audit buffer,
1935 * enclosed in quote marks.
1936 */
Eric Parisb556f8a2008-04-18 10:12:59 -04001937void audit_log_n_string(struct audit_buffer *ab, const char *string,
1938 size_t slen)
Amy Griffis9c937dc2006-06-08 23:19:31 -04001939{
1940 int avail, new_len;
1941 unsigned char *ptr;
1942 struct sk_buff *skb;
1943
Amy Griffis8ef2d302006-09-07 17:03:02 -04001944 if (!ab)
1945 return;
1946
Amy Griffis9c937dc2006-06-08 23:19:31 -04001947 BUG_ON(!ab->skb);
1948 skb = ab->skb;
1949 avail = skb_tailroom(skb);
1950 new_len = slen + 3; /* enclosing quotes + null terminator */
1951 if (new_len > avail) {
1952 avail = audit_expand(ab, new_len);
1953 if (!avail)
1954 return;
1955 }
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001956 ptr = skb_tail_pointer(skb);
Amy Griffis9c937dc2006-06-08 23:19:31 -04001957 *ptr++ = '"';
1958 memcpy(ptr, string, slen);
1959 ptr += slen;
1960 *ptr++ = '"';
1961 *ptr = 0;
1962 skb_put(skb, slen + 2); /* don't include null terminator */
1963}
1964
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001965/**
Eric Parisde6bbd12008-01-07 14:31:58 -05001966 * audit_string_contains_control - does a string need to be logged in hex
Dave Jonesf706d5d2008-03-28 14:15:56 -07001967 * @string: string to be checked
1968 * @len: max length of the string to check
Eric Parisde6bbd12008-01-07 14:31:58 -05001969 */
Yaowei Bai9fcf8362015-11-04 08:23:51 -05001970bool audit_string_contains_control(const char *string, size_t len)
Eric Parisde6bbd12008-01-07 14:31:58 -05001971{
1972 const unsigned char *p;
Miloslav Trmacb3897f52009-03-19 09:48:27 -04001973 for (p = string; p < (const unsigned char *)string + len; p++) {
Vesa-Matti J Kari1d6c9642008-07-23 00:06:13 +03001974 if (*p == '"' || *p < 0x21 || *p > 0x7e)
Yaowei Bai9fcf8362015-11-04 08:23:51 -05001975 return true;
Eric Parisde6bbd12008-01-07 14:31:58 -05001976 }
Yaowei Bai9fcf8362015-11-04 08:23:51 -05001977 return false;
Eric Parisde6bbd12008-01-07 14:31:58 -05001978}
1979
1980/**
Miloslav Trmac522ed772007-07-15 23:40:56 -07001981 * audit_log_n_untrustedstring - log a string that may contain random characters
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001982 * @ab: audit_buffer
Dave Jonesf706d5d2008-03-28 14:15:56 -07001983 * @len: length of string (not including trailing null)
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001984 * @string: string to be logged
1985 *
1986 * This code will escape a string that is passed to it if the string
1987 * contains a control character, unprintable character, double quote mark,
Steve Grubb168b7172005-05-19 10:24:22 +01001988 * or a space. Unescaped strings will start and end with a double quote mark.
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001989 * Strings that are escaped are printed in hex (2 digits per char).
Amy Griffis9c937dc2006-06-08 23:19:31 -04001990 *
1991 * The caller specifies the number of characters in the string to log, which may
1992 * or may not be the entire string.
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07001993 */
Eric Parisb556f8a2008-04-18 10:12:59 -04001994void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
1995 size_t len)
83c7d092005-04-29 15:54:44 +01001996{
Eric Parisde6bbd12008-01-07 14:31:58 -05001997 if (audit_string_contains_control(string, len))
Eric Parisb556f8a2008-04-18 10:12:59 -04001998 audit_log_n_hex(ab, string, len);
Eric Parisde6bbd12008-01-07 14:31:58 -05001999 else
Eric Parisb556f8a2008-04-18 10:12:59 -04002000 audit_log_n_string(ab, string, len);
83c7d092005-04-29 15:54:44 +01002001}
2002
Amy Griffis9c937dc2006-06-08 23:19:31 -04002003/**
Miloslav Trmac522ed772007-07-15 23:40:56 -07002004 * audit_log_untrustedstring - log a string that may contain random characters
Amy Griffis9c937dc2006-06-08 23:19:31 -04002005 * @ab: audit_buffer
2006 * @string: string to be logged
2007 *
Miloslav Trmac522ed772007-07-15 23:40:56 -07002008 * Same as audit_log_n_untrustedstring(), except that strlen is used to
Amy Griffis9c937dc2006-06-08 23:19:31 -04002009 * determine string length.
2010 */
Eric Parisde6bbd12008-01-07 14:31:58 -05002011void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
Amy Griffis9c937dc2006-06-08 23:19:31 -04002012{
Eric Parisb556f8a2008-04-18 10:12:59 -04002013 audit_log_n_untrustedstring(ab, string, strlen(string));
Amy Griffis9c937dc2006-06-08 23:19:31 -04002014}
2015
Steve Grubb168b7172005-05-19 10:24:22 +01002016/* This is a helper-function to print the escaped d_path */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
Al Viro66b3fad2012-03-14 21:48:20 -04002018 const struct path *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019{
Jan Blunck44707fd2008-02-14 19:38:33 -08002020 char *p, *pathname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021
Chris Wright8fc61152005-05-06 15:54:17 +01002022 if (prefix)
Kees Cookc158a352012-01-06 14:07:10 -08002023 audit_log_format(ab, "%s", prefix);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024
Steve Grubb168b7172005-05-19 10:24:22 +01002025 /* We will allow 11 spaces for ' (deleted)' to be appended */
Jan Blunck44707fd2008-02-14 19:38:33 -08002026 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
2027 if (!pathname) {
Eric Parisdef57542009-03-10 18:00:14 -04002028 audit_log_string(ab, "<no_memory>");
Steve Grubb168b7172005-05-19 10:24:22 +01002029 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030 }
Jan Blunckcf28b482008-02-14 19:38:44 -08002031 p = d_path(path, pathname, PATH_MAX+11);
Steve Grubb168b7172005-05-19 10:24:22 +01002032 if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
2033 /* FIXME: can we save some information here? */
Eric Parisdef57542009-03-10 18:00:14 -04002034 audit_log_string(ab, "<too_long>");
Daniel Walker5600b892007-10-18 03:06:10 -07002035 } else
Steve Grubb168b7172005-05-19 10:24:22 +01002036 audit_log_untrustedstring(ab, p);
Jan Blunck44707fd2008-02-14 19:38:33 -08002037 kfree(pathname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038}
2039
Eric Paris4d3fb702013-04-30 09:53:34 -04002040void audit_log_session_info(struct audit_buffer *ab)
2041{
Eric Paris4440e852013-11-27 17:35:17 -05002042 unsigned int sessionid = audit_get_sessionid(current);
Eric Paris4d3fb702013-04-30 09:53:34 -04002043 uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current));
2044
Richard Guy Briggsb8f89ca2013-09-18 11:17:43 -04002045 audit_log_format(ab, " auid=%u ses=%u", auid, sessionid);
Eric Paris4d3fb702013-04-30 09:53:34 -04002046}
2047
Eric Paris9d960982009-06-11 14:31:37 -04002048void audit_log_key(struct audit_buffer *ab, char *key)
2049{
2050 audit_log_format(ab, " key=");
2051 if (key)
2052 audit_log_untrustedstring(ab, key);
2053 else
2054 audit_log_format(ab, "(null)");
2055}
2056
Eric Parisb24a30a2013-04-30 15:30:32 -04002057void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
2058{
2059 int i;
2060
2061 audit_log_format(ab, " %s=", prefix);
2062 CAP_FOR_EACH_U32(i) {
2063 audit_log_format(ab, "%08x",
Eric Paris7d8b6c62014-07-23 15:36:26 -04002064 cap->cap[CAP_LAST_U32 - i]);
Eric Parisb24a30a2013-04-30 15:30:32 -04002065 }
2066}
2067
Richard Guy Briggs691e6d52014-05-26 11:02:48 -04002068static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
Eric Parisb24a30a2013-04-30 15:30:32 -04002069{
Richard Guy Briggs4b3e4ed2017-04-20 13:07:30 -04002070 audit_log_cap(ab, "cap_fp", &name->fcap.permitted);
2071 audit_log_cap(ab, "cap_fi", &name->fcap.inheritable);
2072 audit_log_format(ab, " cap_fe=%d cap_fver=%x",
2073 name->fcap.fE, name->fcap_ver);
Eric Parisb24a30a2013-04-30 15:30:32 -04002074}
2075
2076static inline int audit_copy_fcaps(struct audit_names *name,
2077 const struct dentry *dentry)
2078{
2079 struct cpu_vfs_cap_data caps;
2080 int rc;
2081
2082 if (!dentry)
2083 return 0;
2084
2085 rc = get_vfs_caps_from_disk(dentry, &caps);
2086 if (rc)
2087 return rc;
2088
2089 name->fcap.permitted = caps.permitted;
2090 name->fcap.inheritable = caps.inheritable;
2091 name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2092 name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >>
2093 VFS_CAP_REVISION_SHIFT;
2094
2095 return 0;
2096}
2097
2098/* Copy inode data into an audit_names. */
2099void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
Andreas Gruenbacherd6335d72015-12-24 11:09:39 -05002100 struct inode *inode)
Eric Parisb24a30a2013-04-30 15:30:32 -04002101{
2102 name->ino = inode->i_ino;
2103 name->dev = inode->i_sb->s_dev;
2104 name->mode = inode->i_mode;
2105 name->uid = inode->i_uid;
2106 name->gid = inode->i_gid;
2107 name->rdev = inode->i_rdev;
2108 security_inode_getsecid(inode, &name->osid);
2109 audit_copy_fcaps(name, dentry);
2110}
2111
2112/**
2113 * audit_log_name - produce AUDIT_PATH record from struct audit_names
2114 * @context: audit_context for the task
2115 * @n: audit_names structure with reportable details
2116 * @path: optional path to report instead of audit_names->name
2117 * @record_num: record number to report when handling a list of names
2118 * @call_panic: optional pointer to int that will be updated if secid fails
2119 */
2120void audit_log_name(struct audit_context *context, struct audit_names *n,
Al Viro8bd10762016-11-20 20:36:51 -05002121 const struct path *path, int record_num, int *call_panic)
Eric Parisb24a30a2013-04-30 15:30:32 -04002122{
2123 struct audit_buffer *ab;
2124 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
2125 if (!ab)
2126 return;
2127
2128 audit_log_format(ab, "item=%d", record_num);
2129
2130 if (path)
2131 audit_log_d_path(ab, " name=", path);
2132 else if (n->name) {
2133 switch (n->name_len) {
2134 case AUDIT_NAME_FULL:
2135 /* log the full path */
2136 audit_log_format(ab, " name=");
2137 audit_log_untrustedstring(ab, n->name->name);
2138 break;
2139 case 0:
2140 /* name was specified as a relative path and the
2141 * directory component is the cwd */
2142 audit_log_d_path(ab, " name=", &context->pwd);
2143 break;
2144 default:
2145 /* log the name's directory component */
2146 audit_log_format(ab, " name=");
2147 audit_log_n_untrustedstring(ab, n->name->name,
2148 n->name_len);
2149 }
2150 } else
2151 audit_log_format(ab, " name=(null)");
2152
Linus Torvalds425afcf2015-09-08 13:34:59 -07002153 if (n->ino != AUDIT_INO_UNSET)
Eric Parisb24a30a2013-04-30 15:30:32 -04002154 audit_log_format(ab, " inode=%lu"
2155 " dev=%02x:%02x mode=%#ho"
2156 " ouid=%u ogid=%u rdev=%02x:%02x",
2157 n->ino,
2158 MAJOR(n->dev),
2159 MINOR(n->dev),
2160 n->mode,
2161 from_kuid(&init_user_ns, n->uid),
2162 from_kgid(&init_user_ns, n->gid),
2163 MAJOR(n->rdev),
2164 MINOR(n->rdev));
Eric Parisb24a30a2013-04-30 15:30:32 -04002165 if (n->osid != 0) {
2166 char *ctx = NULL;
2167 u32 len;
2168 if (security_secid_to_secctx(
2169 n->osid, &ctx, &len)) {
2170 audit_log_format(ab, " osid=%u", n->osid);
2171 if (call_panic)
2172 *call_panic = 2;
2173 } else {
2174 audit_log_format(ab, " obj=%s", ctx);
2175 security_release_secctx(ctx, len);
2176 }
2177 }
2178
Jeff Laytond3aea842013-05-08 10:32:23 -04002179 /* log the audit_names record type */
2180 audit_log_format(ab, " nametype=");
2181 switch(n->type) {
2182 case AUDIT_TYPE_NORMAL:
2183 audit_log_format(ab, "NORMAL");
2184 break;
2185 case AUDIT_TYPE_PARENT:
2186 audit_log_format(ab, "PARENT");
2187 break;
2188 case AUDIT_TYPE_CHILD_DELETE:
2189 audit_log_format(ab, "DELETE");
2190 break;
2191 case AUDIT_TYPE_CHILD_CREATE:
2192 audit_log_format(ab, "CREATE");
2193 break;
2194 default:
2195 audit_log_format(ab, "UNKNOWN");
2196 break;
2197 }
2198
Eric Parisb24a30a2013-04-30 15:30:32 -04002199 audit_log_fcaps(ab, n);
2200 audit_log_end(ab);
2201}
2202
2203int audit_log_task_context(struct audit_buffer *ab)
2204{
2205 char *ctx = NULL;
2206 unsigned len;
2207 int error;
2208 u32 sid;
2209
2210 security_task_getsecid(current, &sid);
2211 if (!sid)
2212 return 0;
2213
2214 error = security_secid_to_secctx(sid, &ctx, &len);
2215 if (error) {
2216 if (error != -EINVAL)
2217 goto error_path;
2218 return 0;
2219 }
2220
2221 audit_log_format(ab, " subj=%s", ctx);
2222 security_release_secctx(ctx, len);
2223 return 0;
2224
2225error_path:
2226 audit_panic("error in audit_log_task_context");
2227 return error;
2228}
2229EXPORT_SYMBOL(audit_log_task_context);
2230
Davidlohr Bueso4766b192015-02-22 18:20:00 -08002231void audit_log_d_path_exe(struct audit_buffer *ab,
2232 struct mm_struct *mm)
2233{
Davidlohr Bueso5b282552015-02-22 18:20:09 -08002234 struct file *exe_file;
Davidlohr Bueso4766b192015-02-22 18:20:00 -08002235
Davidlohr Bueso5b282552015-02-22 18:20:09 -08002236 if (!mm)
2237 goto out_null;
2238
2239 exe_file = get_mm_exe_file(mm);
2240 if (!exe_file)
2241 goto out_null;
2242
2243 audit_log_d_path(ab, " exe=", &exe_file->f_path);
2244 fput(exe_file);
2245 return;
2246out_null:
2247 audit_log_format(ab, " exe=(null)");
Davidlohr Bueso4766b192015-02-22 18:20:00 -08002248}
2249
Richard Guy Briggs3f5be2d2016-06-28 12:07:50 -04002250struct tty_struct *audit_get_tty(struct task_struct *tsk)
2251{
2252 struct tty_struct *tty = NULL;
2253 unsigned long flags;
2254
2255 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2256 if (tsk->signal)
2257 tty = tty_kref_get(tsk->signal->tty);
2258 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2259 return tty;
2260}
2261
2262void audit_put_tty(struct tty_struct *tty)
2263{
2264 tty_kref_put(tty);
2265}
2266
Eric Parisb24a30a2013-04-30 15:30:32 -04002267void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
2268{
2269 const struct cred *cred;
Richard Guy Briggs9eab3392014-03-15 18:42:34 -04002270 char comm[sizeof(tsk->comm)];
Richard Guy Briggsdb0a6fb2016-04-21 14:14:01 -04002271 struct tty_struct *tty;
Eric Parisb24a30a2013-04-30 15:30:32 -04002272
2273 if (!ab)
2274 return;
2275
2276 /* tsk == current */
2277 cred = current_cred();
Richard Guy Briggsdb0a6fb2016-04-21 14:14:01 -04002278 tty = audit_get_tty(tsk);
Eric Parisb24a30a2013-04-30 15:30:32 -04002279 audit_log_format(ab,
Richard Guy Briggsc92cdeb2013-12-10 22:10:41 -05002280 " ppid=%d pid=%d auid=%u uid=%u gid=%u"
Eric Parisb24a30a2013-04-30 15:30:32 -04002281 " euid=%u suid=%u fsuid=%u"
Richard Guy Briggs2f2ad102013-07-15 10:23:11 -04002282 " egid=%u sgid=%u fsgid=%u tty=%s ses=%u",
Richard Guy Briggsc92cdeb2013-12-10 22:10:41 -05002283 task_ppid_nr(tsk),
Paul Moorefa2bea22016-08-30 17:19:13 -04002284 task_tgid_nr(tsk),
Eric Parisb24a30a2013-04-30 15:30:32 -04002285 from_kuid(&init_user_ns, audit_get_loginuid(tsk)),
2286 from_kuid(&init_user_ns, cred->uid),
2287 from_kgid(&init_user_ns, cred->gid),
2288 from_kuid(&init_user_ns, cred->euid),
2289 from_kuid(&init_user_ns, cred->suid),
2290 from_kuid(&init_user_ns, cred->fsuid),
2291 from_kgid(&init_user_ns, cred->egid),
2292 from_kgid(&init_user_ns, cred->sgid),
2293 from_kgid(&init_user_ns, cred->fsgid),
Richard Guy Briggsdb0a6fb2016-04-21 14:14:01 -04002294 tty ? tty_name(tty) : "(none)",
2295 audit_get_sessionid(tsk));
2296 audit_put_tty(tty);
Eric Parisb24a30a2013-04-30 15:30:32 -04002297 audit_log_format(ab, " comm=");
Richard Guy Briggs9eab3392014-03-15 18:42:34 -04002298 audit_log_untrustedstring(ab, get_task_comm(comm, tsk));
Davidlohr Bueso4766b192015-02-22 18:20:00 -08002299 audit_log_d_path_exe(ab, tsk->mm);
Eric Parisb24a30a2013-04-30 15:30:32 -04002300 audit_log_task_context(ab);
2301}
2302EXPORT_SYMBOL(audit_log_task_info);
2303
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07002304/**
Kees Cooka51d9ea2012-07-25 17:29:08 -07002305 * audit_log_link_denied - report a link restriction denial
Shailendra Verma22011962015-05-23 10:40:27 +05302306 * @operation: specific link operation
Kees Cooka51d9ea2012-07-25 17:29:08 -07002307 * @link: the path that triggered the restriction
2308 */
Al Viro8bd10762016-11-20 20:36:51 -05002309void audit_log_link_denied(const char *operation, const struct path *link)
Kees Cooka51d9ea2012-07-25 17:29:08 -07002310{
2311 struct audit_buffer *ab;
Eric Parisb24a30a2013-04-30 15:30:32 -04002312 struct audit_names *name;
Kees Cooka51d9ea2012-07-25 17:29:08 -07002313
Eric Parisb24a30a2013-04-30 15:30:32 -04002314 name = kzalloc(sizeof(*name), GFP_NOFS);
2315 if (!name)
2316 return;
2317
2318 /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
Kees Cooka51d9ea2012-07-25 17:29:08 -07002319 ab = audit_log_start(current->audit_context, GFP_KERNEL,
2320 AUDIT_ANOM_LINK);
Sasha Levind1c7d972012-10-04 19:57:31 -04002321 if (!ab)
Eric Parisb24a30a2013-04-30 15:30:32 -04002322 goto out;
2323 audit_log_format(ab, "op=%s", operation);
2324 audit_log_task_info(ab, current);
2325 audit_log_format(ab, " res=0");
Kees Cooka51d9ea2012-07-25 17:29:08 -07002326 audit_log_end(ab);
Eric Parisb24a30a2013-04-30 15:30:32 -04002327
2328 /* Generate AUDIT_PATH record with object. */
2329 name->type = AUDIT_TYPE_NORMAL;
David Howells3b362152015-03-17 22:26:21 +00002330 audit_copy_inode(name, link->dentry, d_backing_inode(link->dentry));
Eric Parisb24a30a2013-04-30 15:30:32 -04002331 audit_log_name(current->audit_context, name, link, 0, NULL);
2332out:
2333 kfree(name);
Kees Cooka51d9ea2012-07-25 17:29:08 -07002334}
2335
2336/**
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07002337 * audit_log_end - end one audit record
2338 * @ab: the audit_buffer
2339 *
Paul Moore4aa838722016-11-29 16:53:24 -05002340 * We can not do a netlink send inside an irq context because it blocks (last
2341 * arg, flags, is not set to MSG_DONTWAIT), so the audit buffer is placed on a
2342 * queue and a tasklet is scheduled to remove them from the queue outside the
2343 * irq context. May be called in any context.
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07002344 */
David Woodhouseb7d11252005-05-19 10:56:58 +01002345void audit_log_end(struct audit_buffer *ab)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002346{
Paul Moore5b523302017-03-21 11:26:35 -04002347 struct sk_buff *skb;
2348 struct nlmsghdr *nlh;
2349
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350 if (!ab)
2351 return;
Paul Moore5b523302017-03-21 11:26:35 -04002352
2353 if (audit_rate_check()) {
2354 skb = ab->skb;
Eric Parisf3d357b2008-04-18 10:02:28 -04002355 ab->skb = NULL;
Paul Moore5b523302017-03-21 11:26:35 -04002356
2357 /* setup the netlink header, see the comments in
2358 * kauditd_send_multicast_skb() for length quirks */
2359 nlh = nlmsg_hdr(skb);
2360 nlh->nlmsg_len = skb->len - NLMSG_HDRLEN;
2361
2362 /* queue the netlink packet and poke the kauditd thread */
2363 skb_queue_tail(&audit_queue, skb);
2364 wake_up_interruptible(&kauditd_wait);
2365 } else
2366 audit_log_lost("rate limit exceeded");
2367
Chris Wright16e19042005-05-06 15:53:34 +01002368 audit_buffer_free(ab);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369}
2370
Randy Dunlapb0dd25a2005-09-13 12:47:11 -07002371/**
2372 * audit_log - Log an audit record
2373 * @ctx: audit context
2374 * @gfp_mask: type of allocation
2375 * @type: audit message type
2376 * @fmt: format string to use
2377 * @...: variable parameters matching the format string
2378 *
2379 * This is a convenience function that calls audit_log_start,
2380 * audit_log_vformat, and audit_log_end. It may be called
2381 * in any context.
2382 */
Daniel Walker5600b892007-10-18 03:06:10 -07002383void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
David Woodhouse9ad9ad32005-06-22 15:04:33 +01002384 const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385{
2386 struct audit_buffer *ab;
2387 va_list args;
2388
David Woodhouse9ad9ad32005-06-22 15:04:33 +01002389 ab = audit_log_start(ctx, gfp_mask, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002390 if (ab) {
2391 va_start(args, fmt);
2392 audit_log_vformat(ab, fmt, args);
2393 va_end(args);
2394 audit_log_end(ab);
2395 }
2396}
lorenzo@gnu.orgbf45da92006-03-09 00:33:47 +01002397
Mr Dash Four131ad622011-06-30 13:31:57 +02002398#ifdef CONFIG_SECURITY
2399/**
2400 * audit_log_secctx - Converts and logs SELinux context
2401 * @ab: audit_buffer
2402 * @secid: security number
2403 *
2404 * This is a helper function that calls security_secid_to_secctx to convert
2405 * secid to secctx and then adds the (converted) SELinux context to the audit
2406 * log by calling audit_log_format, thus also preventing leak of internal secid
2407 * to userspace. If secid cannot be converted audit_panic is called.
2408 */
2409void audit_log_secctx(struct audit_buffer *ab, u32 secid)
2410{
2411 u32 len;
2412 char *secctx;
2413
2414 if (security_secid_to_secctx(secid, &secctx, &len)) {
2415 audit_panic("Cannot convert secid to context");
2416 } else {
2417 audit_log_format(ab, " obj=%s", secctx);
2418 security_release_secctx(secctx, len);
2419 }
2420}
2421EXPORT_SYMBOL(audit_log_secctx);
2422#endif
2423
lorenzo@gnu.orgbf45da92006-03-09 00:33:47 +01002424EXPORT_SYMBOL(audit_log_start);
2425EXPORT_SYMBOL(audit_log_end);
2426EXPORT_SYMBOL(audit_log_format);
2427EXPORT_SYMBOL(audit_log);