Commit | Line | Data |
---|---|---|
85c8721f | 1 | /* audit.c -- Auditing support |
1da177e4 LT |
2 | * Gateway between the kernel (e.g., selinux) and the user-space audit daemon. |
3 | * System-call specific features have moved to auditsc.c | |
4 | * | |
6a01b07f | 5 | * Copyright 2003-2007 Red Hat Inc., Durham, North Carolina. |
1da177e4 LT |
6 | * 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 | * | |
d7a96f3a | 24 | * Goals: 1) Integrate fully with Security Modules. |
1da177e4 LT |
25 | * 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 | * | |
85c8721f | 41 | * Example user-space utilities: http://people.redhat.com/sgrubb/audit/ |
1da177e4 LT |
42 | */ |
43 | ||
d957f7b7 JP |
44 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
45 | ||
5b282552 | 46 | #include <linux/file.h> |
1da177e4 | 47 | #include <linux/init.h> |
7153e402 | 48 | #include <linux/types.h> |
60063497 | 49 | #include <linux/atomic.h> |
1da177e4 | 50 | #include <linux/mm.h> |
9984de1a | 51 | #include <linux/export.h> |
5a0e3ad6 | 52 | #include <linux/slab.h> |
b7d11258 DW |
53 | #include <linux/err.h> |
54 | #include <linux/kthread.h> | |
46e959ea | 55 | #include <linux/kernel.h> |
b24a30a7 | 56 | #include <linux/syscalls.h> |
1da177e4 LT |
57 | |
58 | #include <linux/audit.h> | |
59 | ||
60 | #include <net/sock.h> | |
93315ed6 | 61 | #include <net/netlink.h> |
1da177e4 | 62 | #include <linux/skbuff.h> |
131ad62d MDF |
63 | #ifdef CONFIG_SECURITY |
64 | #include <linux/security.h> | |
65 | #endif | |
7dfb7103 | 66 | #include <linux/freezer.h> |
34e36d8e | 67 | #include <linux/pid_namespace.h> |
33faba7f | 68 | #include <net/netns/generic.h> |
3dc7e315 DG |
69 | |
70 | #include "audit.h" | |
1da177e4 | 71 | |
a3f07114 | 72 | /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED. |
1da177e4 | 73 | * (Initialization happens after skb_init is called.) */ |
a3f07114 EP |
74 | #define AUDIT_DISABLED -1 |
75 | #define AUDIT_UNINITIALIZED 0 | |
76 | #define AUDIT_INITIALIZED 1 | |
1da177e4 LT |
77 | static int audit_initialized; |
78 | ||
1a6b9f23 EP |
79 | #define AUDIT_OFF 0 |
80 | #define AUDIT_ON 1 | |
81 | #define AUDIT_LOCKED 2 | |
3e1d0bb6 JP |
82 | u32 audit_enabled; |
83 | u32 audit_ever_enabled; | |
1da177e4 | 84 | |
ae9d67af JE |
85 | EXPORT_SYMBOL_GPL(audit_enabled); |
86 | ||
1da177e4 | 87 | /* Default state when kernel boots without any parameters. */ |
3e1d0bb6 | 88 | static u32 audit_default; |
1da177e4 LT |
89 | |
90 | /* If auditing cannot proceed, audit_failure selects what happens. */ | |
3e1d0bb6 | 91 | static u32 audit_failure = AUDIT_FAIL_PRINTK; |
1da177e4 | 92 | |
75c0371a PE |
93 | /* |
94 | * If audit records are to be written to the netlink socket, audit_pid | |
15e47304 EB |
95 | * contains the pid of the auditd process and audit_nlk_portid contains |
96 | * the portid to use to send netlink messages to that process. | |
75c0371a | 97 | */ |
c2f0c7c3 | 98 | int audit_pid; |
f9441639 | 99 | static __u32 audit_nlk_portid; |
1da177e4 | 100 | |
b0dd25a8 | 101 | /* If audit_rate_limit is non-zero, limit the rate of sending audit records |
1da177e4 LT |
102 | * to that number per second. This prevents DoS attacks, but results in |
103 | * audit records being dropped. */ | |
3e1d0bb6 | 104 | static u32 audit_rate_limit; |
1da177e4 | 105 | |
40c0775e RGB |
106 | /* Number of outstanding audit_buffers allowed. |
107 | * When set to zero, this means unlimited. */ | |
3e1d0bb6 | 108 | static u32 audit_backlog_limit = 64; |
e789e561 | 109 | #define AUDIT_BACKLOG_WAIT_TIME (60 * HZ) |
a77ed4e5 | 110 | static u32 audit_backlog_wait_time_master = AUDIT_BACKLOG_WAIT_TIME; |
3e1d0bb6 | 111 | static u32 audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME; |
1da177e4 | 112 | |
c2f0c7c3 | 113 | /* The identity of the user shutting down the audit system. */ |
cca080d9 | 114 | kuid_t audit_sig_uid = INVALID_UID; |
c2f0c7c3 | 115 | pid_t audit_sig_pid = -1; |
e1396065 | 116 | u32 audit_sig_sid = 0; |
c2f0c7c3 | 117 | |
1da177e4 LT |
118 | /* Records can be lost in several ways: |
119 | 0) [suppressed in audit_alloc] | |
120 | 1) out of memory in audit_log_start [kmalloc of struct audit_buffer] | |
121 | 2) out of memory in audit_log_move [alloc_skb] | |
122 | 3) suppressed due to audit_rate_limit | |
123 | 4) suppressed due to audit_backlog_limit | |
124 | */ | |
125 | static atomic_t audit_lost = ATOMIC_INIT(0); | |
126 | ||
127 | /* The netlink socket. */ | |
128 | static struct sock *audit_sock; | |
c0a8d9b0 | 129 | static int audit_net_id; |
1da177e4 | 130 | |
f368c07d AG |
131 | /* Hash for inode-based rules */ |
132 | struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; | |
133 | ||
b7d11258 | 134 | /* The audit_freelist is a list of pre-allocated audit buffers (if more |
1da177e4 LT |
135 | * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of |
136 | * being placed on the freelist). */ | |
1da177e4 | 137 | static DEFINE_SPINLOCK(audit_freelist_lock); |
b0dd25a8 | 138 | static int audit_freelist_count; |
1da177e4 LT |
139 | static LIST_HEAD(audit_freelist); |
140 | ||
b7d11258 | 141 | static struct sk_buff_head audit_skb_queue; |
f3d357b0 EP |
142 | /* queue of skbs to send to auditd when/if it comes back */ |
143 | static struct sk_buff_head audit_skb_hold_queue; | |
b7d11258 DW |
144 | static struct task_struct *kauditd_task; |
145 | static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait); | |
9ad9ad38 | 146 | static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait); |
1da177e4 | 147 | |
b0fed402 EP |
148 | static struct audit_features af = {.vers = AUDIT_FEATURE_VERSION, |
149 | .mask = -1, | |
150 | .features = 0, | |
151 | .lock = 0,}; | |
152 | ||
21b85c31 | 153 | static char *audit_feature_names[2] = { |
d040e5af | 154 | "only_unset_loginuid", |
21b85c31 | 155 | "loginuid_immutable", |
b0fed402 EP |
156 | }; |
157 | ||
158 | ||
f368c07d | 159 | /* Serialize requests from userspace. */ |
916d7576 | 160 | DEFINE_MUTEX(audit_cmd_mutex); |
1da177e4 LT |
161 | |
162 | /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting | |
163 | * audit records. Since printk uses a 1024 byte buffer, this buffer | |
164 | * should be at least that large. */ | |
165 | #define AUDIT_BUFSIZ 1024 | |
166 | ||
167 | /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the | |
168 | * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */ | |
169 | #define AUDIT_MAXFREE (2*NR_CPUS) | |
170 | ||
171 | /* The audit_buffer is used when formatting an audit record. The caller | |
172 | * locks briefly to get the record off the freelist or to allocate the | |
173 | * buffer, and locks briefly to send the buffer to the netlink layer or | |
174 | * to place it on a transmit queue. Multiple audit_buffers can be in | |
175 | * use simultaneously. */ | |
176 | struct audit_buffer { | |
177 | struct list_head list; | |
8fc6115c | 178 | struct sk_buff *skb; /* formatted skb ready to send */ |
1da177e4 | 179 | struct audit_context *ctx; /* NULL or associated context */ |
9796fdd8 | 180 | gfp_t gfp_mask; |
1da177e4 LT |
181 | }; |
182 | ||
f09ac9db | 183 | struct audit_reply { |
f9441639 | 184 | __u32 portid; |
638a0fd2 | 185 | struct net *net; |
f09ac9db EP |
186 | struct sk_buff *skb; |
187 | }; | |
188 | ||
f9441639 | 189 | static void audit_set_portid(struct audit_buffer *ab, __u32 portid) |
c0404993 | 190 | { |
50397bd1 EP |
191 | if (ab) { |
192 | struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); | |
f9441639 | 193 | nlh->nlmsg_pid = portid; |
50397bd1 | 194 | } |
c0404993 SG |
195 | } |
196 | ||
8c8570fb | 197 | void audit_panic(const char *message) |
1da177e4 | 198 | { |
d957f7b7 | 199 | switch (audit_failure) { |
1da177e4 LT |
200 | case AUDIT_FAIL_SILENT: |
201 | break; | |
202 | case AUDIT_FAIL_PRINTK: | |
320f1b1e | 203 | if (printk_ratelimit()) |
d957f7b7 | 204 | pr_err("%s\n", message); |
1da177e4 LT |
205 | break; |
206 | case AUDIT_FAIL_PANIC: | |
b29ee87e EP |
207 | /* test audit_pid since printk is always losey, why bother? */ |
208 | if (audit_pid) | |
209 | panic("audit: %s\n", message); | |
1da177e4 LT |
210 | break; |
211 | } | |
212 | } | |
213 | ||
214 | static inline int audit_rate_check(void) | |
215 | { | |
216 | static unsigned long last_check = 0; | |
217 | static int messages = 0; | |
218 | static DEFINE_SPINLOCK(lock); | |
219 | unsigned long flags; | |
220 | unsigned long now; | |
221 | unsigned long elapsed; | |
222 | int retval = 0; | |
223 | ||
224 | if (!audit_rate_limit) return 1; | |
225 | ||
226 | spin_lock_irqsave(&lock, flags); | |
227 | if (++messages < audit_rate_limit) { | |
228 | retval = 1; | |
229 | } else { | |
230 | now = jiffies; | |
231 | elapsed = now - last_check; | |
232 | if (elapsed > HZ) { | |
233 | last_check = now; | |
234 | messages = 0; | |
235 | retval = 1; | |
236 | } | |
237 | } | |
238 | spin_unlock_irqrestore(&lock, flags); | |
239 | ||
240 | return retval; | |
241 | } | |
242 | ||
b0dd25a8 RD |
243 | /** |
244 | * audit_log_lost - conditionally log lost audit message event | |
245 | * @message: the message stating reason for lost audit message | |
246 | * | |
247 | * Emit at least 1 message per second, even if audit_rate_check is | |
248 | * throttling. | |
249 | * Always increment the lost messages counter. | |
250 | */ | |
1da177e4 LT |
251 | void audit_log_lost(const char *message) |
252 | { | |
253 | static unsigned long last_msg = 0; | |
254 | static DEFINE_SPINLOCK(lock); | |
255 | unsigned long flags; | |
256 | unsigned long now; | |
257 | int print; | |
258 | ||
259 | atomic_inc(&audit_lost); | |
260 | ||
261 | print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit); | |
262 | ||
263 | if (!print) { | |
264 | spin_lock_irqsave(&lock, flags); | |
265 | now = jiffies; | |
266 | if (now - last_msg > HZ) { | |
267 | print = 1; | |
268 | last_msg = now; | |
269 | } | |
270 | spin_unlock_irqrestore(&lock, flags); | |
271 | } | |
272 | ||
273 | if (print) { | |
320f1b1e | 274 | if (printk_ratelimit()) |
3e1d0bb6 | 275 | pr_warn("audit_lost=%u audit_rate_limit=%u audit_backlog_limit=%u\n", |
320f1b1e EP |
276 | atomic_read(&audit_lost), |
277 | audit_rate_limit, | |
278 | audit_backlog_limit); | |
1da177e4 LT |
279 | audit_panic(message); |
280 | } | |
1da177e4 LT |
281 | } |
282 | ||
3e1d0bb6 | 283 | static int audit_log_config_change(char *function_name, u32 new, u32 old, |
2532386f | 284 | int allow_changes) |
1da177e4 | 285 | { |
1a6b9f23 EP |
286 | struct audit_buffer *ab; |
287 | int rc = 0; | |
ce29b682 | 288 | |
1a6b9f23 | 289 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); |
0644ec0c KC |
290 | if (unlikely(!ab)) |
291 | return rc; | |
3e1d0bb6 | 292 | audit_log_format(ab, "%s=%u old=%u", function_name, new, old); |
4d3fb709 | 293 | audit_log_session_info(ab); |
b122c376 EP |
294 | rc = audit_log_task_context(ab); |
295 | if (rc) | |
296 | allow_changes = 0; /* Something weird, deny request */ | |
1a6b9f23 EP |
297 | audit_log_format(ab, " res=%d", allow_changes); |
298 | audit_log_end(ab); | |
6a01b07f | 299 | return rc; |
1da177e4 LT |
300 | } |
301 | ||
3e1d0bb6 | 302 | static int audit_do_config_change(char *function_name, u32 *to_change, u32 new) |
1da177e4 | 303 | { |
3e1d0bb6 JP |
304 | int allow_changes, rc = 0; |
305 | u32 old = *to_change; | |
6a01b07f SG |
306 | |
307 | /* check if we are locked */ | |
1a6b9f23 EP |
308 | if (audit_enabled == AUDIT_LOCKED) |
309 | allow_changes = 0; | |
6a01b07f | 310 | else |
1a6b9f23 | 311 | allow_changes = 1; |
ce29b682 | 312 | |
1a6b9f23 | 313 | if (audit_enabled != AUDIT_OFF) { |
dc9eb698 | 314 | rc = audit_log_config_change(function_name, new, old, allow_changes); |
1a6b9f23 EP |
315 | if (rc) |
316 | allow_changes = 0; | |
6a01b07f | 317 | } |
6a01b07f SG |
318 | |
319 | /* If we are allowed, make the change */ | |
1a6b9f23 EP |
320 | if (allow_changes == 1) |
321 | *to_change = new; | |
6a01b07f SG |
322 | /* Not allowed, update reason */ |
323 | else if (rc == 0) | |
324 | rc = -EPERM; | |
325 | return rc; | |
1da177e4 LT |
326 | } |
327 | ||
3e1d0bb6 | 328 | static int audit_set_rate_limit(u32 limit) |
1da177e4 | 329 | { |
dc9eb698 | 330 | return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit); |
1a6b9f23 | 331 | } |
ce29b682 | 332 | |
3e1d0bb6 | 333 | static int audit_set_backlog_limit(u32 limit) |
1a6b9f23 | 334 | { |
dc9eb698 | 335 | return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit); |
1a6b9f23 | 336 | } |
6a01b07f | 337 | |
3e1d0bb6 | 338 | static int audit_set_backlog_wait_time(u32 timeout) |
51cc83f0 RGB |
339 | { |
340 | return audit_do_config_change("audit_backlog_wait_time", | |
a77ed4e5 | 341 | &audit_backlog_wait_time_master, timeout); |
51cc83f0 RGB |
342 | } |
343 | ||
3e1d0bb6 | 344 | static int audit_set_enabled(u32 state) |
1a6b9f23 | 345 | { |
b593d384 | 346 | int rc; |
724e7bfc | 347 | if (state > AUDIT_LOCKED) |
1a6b9f23 | 348 | return -EINVAL; |
6a01b07f | 349 | |
dc9eb698 | 350 | rc = audit_do_config_change("audit_enabled", &audit_enabled, state); |
b593d384 EP |
351 | if (!rc) |
352 | audit_ever_enabled |= !!state; | |
353 | ||
354 | return rc; | |
1da177e4 LT |
355 | } |
356 | ||
3e1d0bb6 | 357 | static int audit_set_failure(u32 state) |
1da177e4 | 358 | { |
1da177e4 LT |
359 | if (state != AUDIT_FAIL_SILENT |
360 | && state != AUDIT_FAIL_PRINTK | |
361 | && state != AUDIT_FAIL_PANIC) | |
362 | return -EINVAL; | |
ce29b682 | 363 | |
dc9eb698 | 364 | return audit_do_config_change("audit_failure", &audit_failure, state); |
1da177e4 LT |
365 | } |
366 | ||
f3d357b0 EP |
367 | /* |
368 | * Queue skbs to be sent to auditd when/if it comes back. These skbs should | |
369 | * already have been sent via prink/syslog and so if these messages are dropped | |
370 | * it is not a huge concern since we already passed the audit_log_lost() | |
371 | * notification and stuff. This is just nice to get audit messages during | |
372 | * boot before auditd is running or messages generated while auditd is stopped. | |
373 | * This only holds messages is audit_default is set, aka booting with audit=1 | |
374 | * or building your kernel that way. | |
375 | */ | |
376 | static void audit_hold_skb(struct sk_buff *skb) | |
377 | { | |
378 | if (audit_default && | |
40c0775e RGB |
379 | (!audit_backlog_limit || |
380 | skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit)) | |
f3d357b0 EP |
381 | skb_queue_tail(&audit_skb_hold_queue, skb); |
382 | else | |
383 | kfree_skb(skb); | |
384 | } | |
385 | ||
038cbcf6 EP |
386 | /* |
387 | * For one reason or another this nlh isn't getting delivered to the userspace | |
388 | * audit daemon, just send it to printk. | |
389 | */ | |
390 | static void audit_printk_skb(struct sk_buff *skb) | |
391 | { | |
392 | struct nlmsghdr *nlh = nlmsg_hdr(skb); | |
c64e66c6 | 393 | char *data = nlmsg_data(nlh); |
038cbcf6 EP |
394 | |
395 | if (nlh->nlmsg_type != AUDIT_EOE) { | |
396 | if (printk_ratelimit()) | |
d957f7b7 | 397 | pr_notice("type=%d %s\n", nlh->nlmsg_type, data); |
038cbcf6 | 398 | else |
f1283527 | 399 | audit_log_lost("printk limit exceeded"); |
038cbcf6 EP |
400 | } |
401 | ||
402 | audit_hold_skb(skb); | |
403 | } | |
404 | ||
f3d357b0 EP |
405 | static void kauditd_send_skb(struct sk_buff *skb) |
406 | { | |
407 | int err; | |
32a1dbae RGB |
408 | int attempts = 0; |
409 | #define AUDITD_RETRIES 5 | |
410 | ||
411 | restart: | |
f3d357b0 EP |
412 | /* take a reference in case we can't send it and we want to hold it */ |
413 | skb_get(skb); | |
15e47304 | 414 | err = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0); |
f3d357b0 | 415 | if (err < 0) { |
32a1dbae RGB |
416 | pr_err("netlink_unicast sending to audit_pid=%d returned error: %d\n", |
417 | audit_pid, err); | |
04ee1a3b | 418 | if (audit_pid) { |
32a1dbae RGB |
419 | if (err == -ECONNREFUSED || err == -EPERM |
420 | || ++attempts >= AUDITD_RETRIES) { | |
421 | char s[32]; | |
422 | ||
423 | snprintf(s, sizeof(s), "audit_pid=%d reset", audit_pid); | |
424 | audit_log_lost(s); | |
425 | audit_pid = 0; | |
426 | audit_sock = NULL; | |
427 | } else { | |
428 | pr_warn("re-scheduling(#%d) write to audit_pid=%d\n", | |
429 | attempts, audit_pid); | |
430 | set_current_state(TASK_INTERRUPTIBLE); | |
431 | schedule(); | |
32a1dbae RGB |
432 | goto restart; |
433 | } | |
04ee1a3b | 434 | } |
f3d357b0 EP |
435 | /* we might get lucky and get this in the next auditd */ |
436 | audit_hold_skb(skb); | |
437 | } else | |
438 | /* drop the extra reference if sent ok */ | |
70d4bf6d | 439 | consume_skb(skb); |
f3d357b0 EP |
440 | } |
441 | ||
451f9216 RGB |
442 | /* |
443 | * kauditd_send_multicast_skb - send the skb to multicast userspace listeners | |
444 | * | |
445 | * This function doesn't consume an skb as might be expected since it has to | |
446 | * copy it anyways. | |
447 | */ | |
54dc77d9 | 448 | static void kauditd_send_multicast_skb(struct sk_buff *skb, gfp_t gfp_mask) |
451f9216 RGB |
449 | { |
450 | struct sk_buff *copy; | |
451 | struct audit_net *aunet = net_generic(&init_net, audit_net_id); | |
452 | struct sock *sock = aunet->nlsk; | |
453 | ||
7f74ecd7 RGB |
454 | if (!netlink_has_listeners(sock, AUDIT_NLGRP_READLOG)) |
455 | return; | |
456 | ||
451f9216 RGB |
457 | /* |
458 | * The seemingly wasteful skb_copy() rather than bumping the refcount | |
459 | * using skb_get() is necessary because non-standard mods are made to | |
460 | * the skb by the original kaudit unicast socket send routine. The | |
461 | * existing auditd daemon assumes this breakage. Fixing this would | |
462 | * require co-ordinating a change in the established protocol between | |
463 | * the kaudit kernel subsystem and the auditd userspace code. There is | |
464 | * no reason for new multicast clients to continue with this | |
465 | * non-compliance. | |
466 | */ | |
54dc77d9 | 467 | copy = skb_copy(skb, gfp_mask); |
451f9216 RGB |
468 | if (!copy) |
469 | return; | |
470 | ||
54dc77d9 | 471 | nlmsg_multicast(sock, copy, 0, AUDIT_NLGRP_READLOG, gfp_mask); |
451f9216 RGB |
472 | } |
473 | ||
b551d1d9 RGB |
474 | /* |
475 | * flush_hold_queue - empty the hold queue if auditd appears | |
476 | * | |
477 | * If auditd just started, drain the queue of messages already | |
478 | * sent to syslog/printk. Remember loss here is ok. We already | |
479 | * called audit_log_lost() if it didn't go out normally. so the | |
480 | * race between the skb_dequeue and the next check for audit_pid | |
481 | * doesn't matter. | |
482 | * | |
483 | * If you ever find kauditd to be too slow we can get a perf win | |
484 | * by doing our own locking and keeping better track if there | |
485 | * are messages in this queue. I don't see the need now, but | |
486 | * in 5 years when I want to play with this again I'll see this | |
487 | * note and still have no friggin idea what i'm thinking today. | |
488 | */ | |
489 | static void flush_hold_queue(void) | |
b7d11258 DW |
490 | { |
491 | struct sk_buff *skb; | |
492 | ||
b551d1d9 RGB |
493 | if (!audit_default || !audit_pid) |
494 | return; | |
495 | ||
496 | skb = skb_dequeue(&audit_skb_hold_queue); | |
497 | if (likely(!skb)) | |
498 | return; | |
499 | ||
500 | while (skb && audit_pid) { | |
501 | kauditd_send_skb(skb); | |
502 | skb = skb_dequeue(&audit_skb_hold_queue); | |
503 | } | |
504 | ||
505 | /* | |
506 | * if auditd just disappeared but we | |
507 | * dequeued an skb we need to drop ref | |
508 | */ | |
d865e573 | 509 | consume_skb(skb); |
b551d1d9 RGB |
510 | } |
511 | ||
97a41e26 | 512 | static int kauditd_thread(void *dummy) |
b7d11258 | 513 | { |
4aa83872 PM |
514 | struct sk_buff *skb; |
515 | struct nlmsghdr *nlh; | |
516 | ||
83144186 | 517 | set_freezable(); |
4899b8b1 | 518 | while (!kthread_should_stop()) { |
b551d1d9 | 519 | flush_hold_queue(); |
f3d357b0 | 520 | |
b7d11258 DW |
521 | skb = skb_dequeue(&audit_skb_queue); |
522 | if (skb) { | |
4aa83872 PM |
523 | nlh = nlmsg_hdr(skb); |
524 | ||
525 | /* if nlh->nlmsg_len is zero then we haven't attempted | |
526 | * to send the message to userspace yet, if nlmsg_len | |
527 | * is non-zero then we have attempted to send it to | |
528 | * the multicast listeners as well as auditd; keep | |
529 | * trying to send to auditd but don't repeat the | |
530 | * multicast send */ | |
531 | if (nlh->nlmsg_len == 0) { | |
532 | nlh->nlmsg_len = skb->len; | |
533 | kauditd_send_multicast_skb(skb, GFP_KERNEL); | |
534 | ||
535 | /* see the note in kauditd_send_multicast_skb | |
536 | * regarding the nlh->nlmsg_len value and why | |
537 | * it differs between the multicast and unicast | |
538 | * clients */ | |
539 | nlh->nlmsg_len -= NLMSG_HDRLEN; | |
540 | } | |
541 | ||
f3d357b0 EP |
542 | if (audit_pid) |
543 | kauditd_send_skb(skb); | |
038cbcf6 EP |
544 | else |
545 | audit_printk_skb(skb); | |
4aa83872 PM |
546 | } else { |
547 | /* we have flushed the backlog so wake everyone up who | |
548 | * is blocked and go to sleep until we have something | |
549 | * in the backlog again */ | |
550 | wake_up(&audit_backlog_wait); | |
551 | wait_event_freezable(kauditd_wait, | |
552 | skb_queue_len(&audit_skb_queue)); | |
3320c513 | 553 | } |
b7d11258 | 554 | } |
4899b8b1 | 555 | return 0; |
b7d11258 DW |
556 | } |
557 | ||
9044e6bc AV |
558 | int audit_send_list(void *_dest) |
559 | { | |
560 | struct audit_netlink_list *dest = _dest; | |
9044e6bc | 561 | struct sk_buff *skb; |
48095d99 | 562 | struct net *net = dest->net; |
33faba7f | 563 | struct audit_net *aunet = net_generic(net, audit_net_id); |
9044e6bc AV |
564 | |
565 | /* wait for parent to finish and send an ACK */ | |
f368c07d AG |
566 | mutex_lock(&audit_cmd_mutex); |
567 | mutex_unlock(&audit_cmd_mutex); | |
9044e6bc AV |
568 | |
569 | while ((skb = __skb_dequeue(&dest->q)) != NULL) | |
33faba7f | 570 | netlink_unicast(aunet->nlsk, skb, dest->portid, 0); |
9044e6bc | 571 | |
48095d99 | 572 | put_net(net); |
9044e6bc AV |
573 | kfree(dest); |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
f9441639 | 578 | struct sk_buff *audit_make_reply(__u32 portid, int seq, int type, int done, |
b8800aa5 | 579 | int multi, const void *payload, int size) |
9044e6bc AV |
580 | { |
581 | struct sk_buff *skb; | |
582 | struct nlmsghdr *nlh; | |
9044e6bc AV |
583 | void *data; |
584 | int flags = multi ? NLM_F_MULTI : 0; | |
585 | int t = done ? NLMSG_DONE : type; | |
586 | ||
ee080e6c | 587 | skb = nlmsg_new(size, GFP_KERNEL); |
9044e6bc AV |
588 | if (!skb) |
589 | return NULL; | |
590 | ||
f9441639 | 591 | nlh = nlmsg_put(skb, portid, seq, t, size, flags); |
c64e66c6 DM |
592 | if (!nlh) |
593 | goto out_kfree_skb; | |
594 | data = nlmsg_data(nlh); | |
9044e6bc AV |
595 | memcpy(data, payload, size); |
596 | return skb; | |
597 | ||
c64e66c6 DM |
598 | out_kfree_skb: |
599 | kfree_skb(skb); | |
9044e6bc AV |
600 | return NULL; |
601 | } | |
602 | ||
f09ac9db EP |
603 | static int audit_send_reply_thread(void *arg) |
604 | { | |
605 | struct audit_reply *reply = (struct audit_reply *)arg; | |
48095d99 | 606 | struct net *net = reply->net; |
33faba7f | 607 | struct audit_net *aunet = net_generic(net, audit_net_id); |
f09ac9db EP |
608 | |
609 | mutex_lock(&audit_cmd_mutex); | |
610 | mutex_unlock(&audit_cmd_mutex); | |
611 | ||
612 | /* Ignore failure. It'll only happen if the sender goes away, | |
613 | because our timeout is set to infinite. */ | |
33faba7f | 614 | netlink_unicast(aunet->nlsk , reply->skb, reply->portid, 0); |
48095d99 | 615 | put_net(net); |
f09ac9db EP |
616 | kfree(reply); |
617 | return 0; | |
618 | } | |
b0dd25a8 RD |
619 | /** |
620 | * audit_send_reply - send an audit reply message via netlink | |
d211f177 | 621 | * @request_skb: skb of request we are replying to (used to target the reply) |
b0dd25a8 RD |
622 | * @seq: sequence number |
623 | * @type: audit message type | |
624 | * @done: done (last) flag | |
625 | * @multi: multi-part message flag | |
626 | * @payload: payload data | |
627 | * @size: payload size | |
628 | * | |
f9441639 | 629 | * Allocates an skb, builds the netlink message, and sends it to the port id. |
b0dd25a8 RD |
630 | * No failure notifications. |
631 | */ | |
6f285b19 | 632 | static void audit_send_reply(struct sk_buff *request_skb, int seq, int type, int done, |
f9441639 | 633 | int multi, const void *payload, int size) |
1da177e4 | 634 | { |
6f285b19 EB |
635 | u32 portid = NETLINK_CB(request_skb).portid; |
636 | struct net *net = sock_net(NETLINK_CB(request_skb).sk); | |
f09ac9db EP |
637 | struct sk_buff *skb; |
638 | struct task_struct *tsk; | |
639 | struct audit_reply *reply = kmalloc(sizeof(struct audit_reply), | |
640 | GFP_KERNEL); | |
641 | ||
642 | if (!reply) | |
643 | return; | |
644 | ||
f9441639 | 645 | skb = audit_make_reply(portid, seq, type, done, multi, payload, size); |
1da177e4 | 646 | if (!skb) |
fcaf1eb8 | 647 | goto out; |
f09ac9db | 648 | |
6f285b19 | 649 | reply->net = get_net(net); |
f9441639 | 650 | reply->portid = portid; |
f09ac9db EP |
651 | reply->skb = skb; |
652 | ||
653 | tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply"); | |
fcaf1eb8 AM |
654 | if (!IS_ERR(tsk)) |
655 | return; | |
656 | kfree_skb(skb); | |
657 | out: | |
658 | kfree(reply); | |
1da177e4 LT |
659 | } |
660 | ||
661 | /* | |
662 | * Check for appropriate CAP_AUDIT_ capabilities on incoming audit | |
663 | * control messages. | |
664 | */ | |
c7bdb545 | 665 | static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type) |
1da177e4 LT |
666 | { |
667 | int err = 0; | |
668 | ||
5a3cb3b6 | 669 | /* Only support initial user namespace for now. */ |
aa4af831 EP |
670 | /* |
671 | * We return ECONNREFUSED because it tricks userspace into thinking | |
672 | * that audit was not configured into the kernel. Lots of users | |
673 | * configure their PAM stack (because that's what the distro does) | |
674 | * to reject login if unable to send messages to audit. If we return | |
675 | * ECONNREFUSED the PAM stack thinks the kernel does not have audit | |
676 | * configured in and will let login proceed. If we return EPERM | |
677 | * userspace will reject all logins. This should be removed when we | |
678 | * support non init namespaces!! | |
679 | */ | |
0b747172 | 680 | if (current_user_ns() != &init_user_ns) |
aa4af831 | 681 | return -ECONNREFUSED; |
34e36d8e | 682 | |
1da177e4 | 683 | switch (msg_type) { |
1da177e4 | 684 | case AUDIT_LIST: |
1da177e4 LT |
685 | case AUDIT_ADD: |
686 | case AUDIT_DEL: | |
18900909 EP |
687 | return -EOPNOTSUPP; |
688 | case AUDIT_GET: | |
689 | case AUDIT_SET: | |
b0fed402 EP |
690 | case AUDIT_GET_FEATURE: |
691 | case AUDIT_SET_FEATURE: | |
18900909 EP |
692 | case AUDIT_LIST_RULES: |
693 | case AUDIT_ADD_RULE: | |
93315ed6 | 694 | case AUDIT_DEL_RULE: |
c2f0c7c3 | 695 | case AUDIT_SIGNAL_INFO: |
522ed776 MT |
696 | case AUDIT_TTY_GET: |
697 | case AUDIT_TTY_SET: | |
74c3cbe3 AV |
698 | case AUDIT_TRIM: |
699 | case AUDIT_MAKE_EQUIV: | |
5a3cb3b6 RGB |
700 | /* Only support auditd and auditctl in initial pid namespace |
701 | * for now. */ | |
5985de67 | 702 | if (task_active_pid_ns(current) != &init_pid_ns) |
5a3cb3b6 RGB |
703 | return -EPERM; |
704 | ||
90f62cf3 | 705 | if (!netlink_capable(skb, CAP_AUDIT_CONTROL)) |
1da177e4 LT |
706 | err = -EPERM; |
707 | break; | |
05474106 | 708 | case AUDIT_USER: |
039b6b3e RD |
709 | case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: |
710 | case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: | |
90f62cf3 | 711 | if (!netlink_capable(skb, CAP_AUDIT_WRITE)) |
1da177e4 LT |
712 | err = -EPERM; |
713 | break; | |
714 | default: /* bad msg */ | |
715 | err = -EINVAL; | |
716 | } | |
717 | ||
718 | return err; | |
719 | } | |
720 | ||
233a6866 | 721 | static void audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type) |
50397bd1 | 722 | { |
dc9eb698 | 723 | uid_t uid = from_kuid(&init_user_ns, current_uid()); |
f1dc4867 | 724 | pid_t pid = task_tgid_nr(current); |
50397bd1 | 725 | |
0868a5e1 | 726 | if (!audit_enabled && msg_type != AUDIT_USER_AVC) { |
50397bd1 | 727 | *ab = NULL; |
233a6866 | 728 | return; |
50397bd1 EP |
729 | } |
730 | ||
731 | *ab = audit_log_start(NULL, GFP_KERNEL, msg_type); | |
0644ec0c | 732 | if (unlikely(!*ab)) |
233a6866 | 733 | return; |
f1dc4867 | 734 | audit_log_format(*ab, "pid=%d uid=%u", pid, uid); |
4d3fb709 | 735 | audit_log_session_info(*ab); |
b122c376 | 736 | audit_log_task_context(*ab); |
50397bd1 EP |
737 | } |
738 | ||
b0fed402 EP |
739 | int is_audit_feature_set(int i) |
740 | { | |
741 | return af.features & AUDIT_FEATURE_TO_MASK(i); | |
742 | } | |
743 | ||
744 | ||
745 | static int audit_get_feature(struct sk_buff *skb) | |
746 | { | |
747 | u32 seq; | |
748 | ||
749 | seq = nlmsg_hdr(skb)->nlmsg_seq; | |
750 | ||
9ef91514 | 751 | audit_send_reply(skb, seq, AUDIT_GET_FEATURE, 0, 0, &af, sizeof(af)); |
b0fed402 EP |
752 | |
753 | return 0; | |
754 | } | |
755 | ||
756 | static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature, | |
757 | u32 old_lock, u32 new_lock, int res) | |
758 | { | |
759 | struct audit_buffer *ab; | |
760 | ||
b6c50fe0 G |
761 | if (audit_enabled == AUDIT_OFF) |
762 | return; | |
763 | ||
b0fed402 | 764 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE); |
ad2ac263 | 765 | audit_log_task_info(ab, current); |
897f1acb | 766 | audit_log_format(ab, " feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d", |
b0fed402 EP |
767 | audit_feature_names[which], !!old_feature, !!new_feature, |
768 | !!old_lock, !!new_lock, res); | |
769 | audit_log_end(ab); | |
770 | } | |
771 | ||
772 | static int audit_set_feature(struct sk_buff *skb) | |
773 | { | |
774 | struct audit_features *uaf; | |
775 | int i; | |
776 | ||
6eed9b26 | 777 | BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > ARRAY_SIZE(audit_feature_names)); |
b0fed402 EP |
778 | uaf = nlmsg_data(nlmsg_hdr(skb)); |
779 | ||
780 | /* if there is ever a version 2 we should handle that here */ | |
781 | ||
782 | for (i = 0; i <= AUDIT_LAST_FEATURE; i++) { | |
783 | u32 feature = AUDIT_FEATURE_TO_MASK(i); | |
784 | u32 old_feature, new_feature, old_lock, new_lock; | |
785 | ||
786 | /* if we are not changing this feature, move along */ | |
787 | if (!(feature & uaf->mask)) | |
788 | continue; | |
789 | ||
790 | old_feature = af.features & feature; | |
791 | new_feature = uaf->features & feature; | |
792 | new_lock = (uaf->lock | af.lock) & feature; | |
793 | old_lock = af.lock & feature; | |
794 | ||
795 | /* are we changing a locked feature? */ | |
4547b3bc | 796 | if (old_lock && (new_feature != old_feature)) { |
b0fed402 EP |
797 | audit_log_feature_change(i, old_feature, new_feature, |
798 | old_lock, new_lock, 0); | |
799 | return -EPERM; | |
800 | } | |
801 | } | |
802 | /* nothing invalid, do the changes */ | |
803 | for (i = 0; i <= AUDIT_LAST_FEATURE; i++) { | |
804 | u32 feature = AUDIT_FEATURE_TO_MASK(i); | |
805 | u32 old_feature, new_feature, old_lock, new_lock; | |
806 | ||
807 | /* if we are not changing this feature, move along */ | |
808 | if (!(feature & uaf->mask)) | |
809 | continue; | |
810 | ||
811 | old_feature = af.features & feature; | |
812 | new_feature = uaf->features & feature; | |
813 | old_lock = af.lock & feature; | |
814 | new_lock = (uaf->lock | af.lock) & feature; | |
815 | ||
816 | if (new_feature != old_feature) | |
817 | audit_log_feature_change(i, old_feature, new_feature, | |
818 | old_lock, new_lock, 1); | |
819 | ||
820 | if (new_feature) | |
821 | af.features |= feature; | |
822 | else | |
823 | af.features &= ~feature; | |
824 | af.lock |= new_lock; | |
825 | } | |
826 | ||
827 | return 0; | |
828 | } | |
829 | ||
133e1e5a RGB |
830 | static int audit_replace(pid_t pid) |
831 | { | |
832 | struct sk_buff *skb = audit_make_reply(0, 0, AUDIT_REPLACE, 0, 0, | |
833 | &pid, sizeof(pid)); | |
834 | ||
835 | if (!skb) | |
836 | return -ENOMEM; | |
837 | return netlink_unicast(audit_sock, skb, audit_nlk_portid, 0); | |
838 | } | |
839 | ||
1da177e4 LT |
840 | static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
841 | { | |
dc9eb698 | 842 | u32 seq; |
1da177e4 | 843 | void *data; |
1da177e4 | 844 | int err; |
c0404993 | 845 | struct audit_buffer *ab; |
1da177e4 | 846 | u16 msg_type = nlh->nlmsg_type; |
e1396065 | 847 | struct audit_sig_info *sig_data; |
50397bd1 | 848 | char *ctx = NULL; |
e1396065 | 849 | u32 len; |
1da177e4 | 850 | |
c7bdb545 | 851 | err = audit_netlink_ok(skb, msg_type); |
1da177e4 LT |
852 | if (err) |
853 | return err; | |
854 | ||
1da177e4 | 855 | seq = nlh->nlmsg_seq; |
c64e66c6 | 856 | data = nlmsg_data(nlh); |
1da177e4 LT |
857 | |
858 | switch (msg_type) { | |
09f883a9 RGB |
859 | case AUDIT_GET: { |
860 | struct audit_status s; | |
861 | memset(&s, 0, sizeof(s)); | |
862 | s.enabled = audit_enabled; | |
863 | s.failure = audit_failure; | |
864 | s.pid = audit_pid; | |
865 | s.rate_limit = audit_rate_limit; | |
866 | s.backlog_limit = audit_backlog_limit; | |
867 | s.lost = atomic_read(&audit_lost); | |
868 | s.backlog = skb_queue_len(&audit_skb_queue); | |
0288d718 | 869 | s.feature_bitmap = AUDIT_FEATURE_BITMAP_ALL; |
a77ed4e5 | 870 | s.backlog_wait_time = audit_backlog_wait_time_master; |
6f285b19 | 871 | audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s)); |
1da177e4 | 872 | break; |
09f883a9 RGB |
873 | } |
874 | case AUDIT_SET: { | |
875 | struct audit_status s; | |
876 | memset(&s, 0, sizeof(s)); | |
877 | /* guard against past and future API changes */ | |
878 | memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh))); | |
879 | if (s.mask & AUDIT_STATUS_ENABLED) { | |
880 | err = audit_set_enabled(s.enabled); | |
20c6aaa3 | 881 | if (err < 0) |
882 | return err; | |
1da177e4 | 883 | } |
09f883a9 RGB |
884 | if (s.mask & AUDIT_STATUS_FAILURE) { |
885 | err = audit_set_failure(s.failure); | |
20c6aaa3 | 886 | if (err < 0) |
887 | return err; | |
1da177e4 | 888 | } |
09f883a9 RGB |
889 | if (s.mask & AUDIT_STATUS_PID) { |
890 | int new_pid = s.pid; | |
133e1e5a | 891 | pid_t requesting_pid = task_tgid_vnr(current); |
1a6b9f23 | 892 | |
935c9e7f RGB |
893 | if ((!new_pid) && (requesting_pid != audit_pid)) { |
894 | audit_log_config_change("audit_pid", new_pid, audit_pid, 0); | |
34eab0a7 | 895 | return -EACCES; |
935c9e7f | 896 | } |
133e1e5a | 897 | if (audit_pid && new_pid && |
935c9e7f RGB |
898 | audit_replace(requesting_pid) != -ECONNREFUSED) { |
899 | audit_log_config_change("audit_pid", new_pid, audit_pid, 0); | |
133e1e5a | 900 | return -EEXIST; |
935c9e7f | 901 | } |
1a6b9f23 | 902 | if (audit_enabled != AUDIT_OFF) |
dc9eb698 | 903 | audit_log_config_change("audit_pid", new_pid, audit_pid, 1); |
1a6b9f23 | 904 | audit_pid = new_pid; |
15e47304 | 905 | audit_nlk_portid = NETLINK_CB(skb).portid; |
de92fc97 | 906 | audit_sock = skb->sk; |
1da177e4 | 907 | } |
09f883a9 RGB |
908 | if (s.mask & AUDIT_STATUS_RATE_LIMIT) { |
909 | err = audit_set_rate_limit(s.rate_limit); | |
20c6aaa3 | 910 | if (err < 0) |
911 | return err; | |
912 | } | |
51cc83f0 | 913 | if (s.mask & AUDIT_STATUS_BACKLOG_LIMIT) { |
09f883a9 | 914 | err = audit_set_backlog_limit(s.backlog_limit); |
51cc83f0 RGB |
915 | if (err < 0) |
916 | return err; | |
917 | } | |
3f0c5fad EP |
918 | if (s.mask & AUDIT_STATUS_BACKLOG_WAIT_TIME) { |
919 | if (sizeof(s) > (size_t)nlh->nlmsg_len) | |
920 | return -EINVAL; | |
724e7bfc | 921 | if (s.backlog_wait_time > 10*AUDIT_BACKLOG_WAIT_TIME) |
3f0c5fad EP |
922 | return -EINVAL; |
923 | err = audit_set_backlog_wait_time(s.backlog_wait_time); | |
924 | if (err < 0) | |
925 | return err; | |
51cc83f0 | 926 | } |
1da177e4 | 927 | break; |
09f883a9 | 928 | } |
b0fed402 EP |
929 | case AUDIT_GET_FEATURE: |
930 | err = audit_get_feature(skb); | |
931 | if (err) | |
932 | return err; | |
933 | break; | |
934 | case AUDIT_SET_FEATURE: | |
935 | err = audit_set_feature(skb); | |
936 | if (err) | |
937 | return err; | |
938 | break; | |
05474106 | 939 | case AUDIT_USER: |
039b6b3e RD |
940 | case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: |
941 | case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: | |
4a4cd633 DW |
942 | if (!audit_enabled && msg_type != AUDIT_USER_AVC) |
943 | return 0; | |
944 | ||
86b2efbe | 945 | err = audit_filter(msg_type, AUDIT_FILTER_USER); |
724e4fcc | 946 | if (err == 1) { /* match or error */ |
4a4cd633 | 947 | err = 0; |
522ed776 | 948 | if (msg_type == AUDIT_USER_TTY) { |
37282a77 | 949 | err = tty_audit_push(); |
522ed776 MT |
950 | if (err) |
951 | break; | |
952 | } | |
1b7b533f | 953 | mutex_unlock(&audit_cmd_mutex); |
dc9eb698 | 954 | audit_log_common_recv_msg(&ab, msg_type); |
50397bd1 | 955 | if (msg_type != AUDIT_USER_TTY) |
b50eba7e RGB |
956 | audit_log_format(ab, " msg='%.*s'", |
957 | AUDIT_MESSAGE_TEXT_MAX, | |
50397bd1 EP |
958 | (char *)data); |
959 | else { | |
960 | int size; | |
961 | ||
f7616102 | 962 | audit_log_format(ab, " data="); |
50397bd1 | 963 | size = nlmsg_len(nlh); |
55ad2f8d MT |
964 | if (size > 0 && |
965 | ((unsigned char *)data)[size - 1] == '\0') | |
966 | size--; | |
b556f8ad | 967 | audit_log_n_untrustedstring(ab, data, size); |
4a4cd633 | 968 | } |
f9441639 | 969 | audit_set_portid(ab, NETLINK_CB(skb).portid); |
50397bd1 | 970 | audit_log_end(ab); |
1b7b533f | 971 | mutex_lock(&audit_cmd_mutex); |
0f45aa18 | 972 | } |
1da177e4 | 973 | break; |
93315ed6 AG |
974 | case AUDIT_ADD_RULE: |
975 | case AUDIT_DEL_RULE: | |
976 | if (nlmsg_len(nlh) < sizeof(struct audit_rule_data)) | |
977 | return -EINVAL; | |
1a6b9f23 | 978 | if (audit_enabled == AUDIT_LOCKED) { |
dc9eb698 EP |
979 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
980 | audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled); | |
50397bd1 | 981 | audit_log_end(ab); |
6a01b07f SG |
982 | return -EPERM; |
983 | } | |
ce0d9f04 | 984 | err = audit_rule_change(msg_type, NETLINK_CB(skb).portid, |
dc9eb698 | 985 | seq, data, nlmsg_len(nlh)); |
1da177e4 | 986 | break; |
ce0d9f04 | 987 | case AUDIT_LIST_RULES: |
6f285b19 | 988 | err = audit_list_rules_send(skb, seq); |
ce0d9f04 | 989 | break; |
74c3cbe3 AV |
990 | case AUDIT_TRIM: |
991 | audit_trim_trees(); | |
dc9eb698 | 992 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
74c3cbe3 AV |
993 | audit_log_format(ab, " op=trim res=1"); |
994 | audit_log_end(ab); | |
995 | break; | |
996 | case AUDIT_MAKE_EQUIV: { | |
997 | void *bufp = data; | |
998 | u32 sizes[2]; | |
7719e437 | 999 | size_t msglen = nlmsg_len(nlh); |
74c3cbe3 AV |
1000 | char *old, *new; |
1001 | ||
1002 | err = -EINVAL; | |
7719e437 | 1003 | if (msglen < 2 * sizeof(u32)) |
74c3cbe3 AV |
1004 | break; |
1005 | memcpy(sizes, bufp, 2 * sizeof(u32)); | |
1006 | bufp += 2 * sizeof(u32); | |
7719e437 HH |
1007 | msglen -= 2 * sizeof(u32); |
1008 | old = audit_unpack_string(&bufp, &msglen, sizes[0]); | |
74c3cbe3 AV |
1009 | if (IS_ERR(old)) { |
1010 | err = PTR_ERR(old); | |
1011 | break; | |
1012 | } | |
7719e437 | 1013 | new = audit_unpack_string(&bufp, &msglen, sizes[1]); |
74c3cbe3 AV |
1014 | if (IS_ERR(new)) { |
1015 | err = PTR_ERR(new); | |
1016 | kfree(old); | |
1017 | break; | |
1018 | } | |
1019 | /* OK, here comes... */ | |
1020 | err = audit_tag_tree(old, new); | |
1021 | ||
dc9eb698 | 1022 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
50397bd1 | 1023 | |
74c3cbe3 AV |
1024 | audit_log_format(ab, " op=make_equiv old="); |
1025 | audit_log_untrustedstring(ab, old); | |
1026 | audit_log_format(ab, " new="); | |
1027 | audit_log_untrustedstring(ab, new); | |
1028 | audit_log_format(ab, " res=%d", !err); | |
1029 | audit_log_end(ab); | |
1030 | kfree(old); | |
1031 | kfree(new); | |
1032 | break; | |
1033 | } | |
c2f0c7c3 | 1034 | case AUDIT_SIGNAL_INFO: |
939cbf26 EP |
1035 | len = 0; |
1036 | if (audit_sig_sid) { | |
1037 | err = security_secid_to_secctx(audit_sig_sid, &ctx, &len); | |
1038 | if (err) | |
1039 | return err; | |
1040 | } | |
e1396065 AV |
1041 | sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL); |
1042 | if (!sig_data) { | |
939cbf26 EP |
1043 | if (audit_sig_sid) |
1044 | security_release_secctx(ctx, len); | |
e1396065 AV |
1045 | return -ENOMEM; |
1046 | } | |
cca080d9 | 1047 | sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid); |
e1396065 | 1048 | sig_data->pid = audit_sig_pid; |
939cbf26 EP |
1049 | if (audit_sig_sid) { |
1050 | memcpy(sig_data->ctx, ctx, len); | |
1051 | security_release_secctx(ctx, len); | |
1052 | } | |
6f285b19 EB |
1053 | audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0, |
1054 | sig_data, sizeof(*sig_data) + len); | |
e1396065 | 1055 | kfree(sig_data); |
c2f0c7c3 | 1056 | break; |
522ed776 MT |
1057 | case AUDIT_TTY_GET: { |
1058 | struct audit_tty_status s; | |
2e28d38a | 1059 | unsigned int t; |
8aa14b64 | 1060 | |
2e28d38a PH |
1061 | t = READ_ONCE(current->signal->audit_tty); |
1062 | s.enabled = t & AUDIT_TTY_ENABLE; | |
1063 | s.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD); | |
8aa14b64 | 1064 | |
6f285b19 | 1065 | audit_send_reply(skb, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s)); |
522ed776 MT |
1066 | break; |
1067 | } | |
1068 | case AUDIT_TTY_SET: { | |
a06e56b2 | 1069 | struct audit_tty_status s, old; |
a06e56b2 | 1070 | struct audit_buffer *ab; |
2e28d38a | 1071 | unsigned int t; |
0e23bacc EP |
1072 | |
1073 | memset(&s, 0, sizeof(s)); | |
1074 | /* guard against past and future API changes */ | |
1075 | memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh))); | |
1076 | /* check if new data is valid */ | |
1077 | if ((s.enabled != 0 && s.enabled != 1) || | |
1078 | (s.log_passwd != 0 && s.log_passwd != 1)) | |
1079 | err = -EINVAL; | |
a06e56b2 | 1080 | |
2e28d38a PH |
1081 | if (err) |
1082 | t = READ_ONCE(current->signal->audit_tty); | |
1083 | else { | |
1084 | t = s.enabled | (-s.log_passwd & AUDIT_TTY_LOG_PASSWD); | |
1085 | t = xchg(¤t->signal->audit_tty, t); | |
0e23bacc | 1086 | } |
2e28d38a PH |
1087 | old.enabled = t & AUDIT_TTY_ENABLE; |
1088 | old.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD); | |
522ed776 | 1089 | |
a06e56b2 | 1090 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
1ce319f1 EP |
1091 | audit_log_format(ab, " op=tty_set old-enabled=%d new-enabled=%d" |
1092 | " old-log_passwd=%d new-log_passwd=%d res=%d", | |
1093 | old.enabled, s.enabled, old.log_passwd, | |
1094 | s.log_passwd, !err); | |
a06e56b2 | 1095 | audit_log_end(ab); |
522ed776 MT |
1096 | break; |
1097 | } | |
1da177e4 LT |
1098 | default: |
1099 | err = -EINVAL; | |
1100 | break; | |
1101 | } | |
1102 | ||
1103 | return err < 0 ? err : 0; | |
1104 | } | |
1105 | ||
b0dd25a8 | 1106 | /* |
ea7ae60b EP |
1107 | * Get message from skb. Each message is processed by audit_receive_msg. |
1108 | * Malformed skbs with wrong length are discarded silently. | |
b0dd25a8 | 1109 | */ |
2a0a6ebe | 1110 | static void audit_receive_skb(struct sk_buff *skb) |
1da177e4 | 1111 | { |
ea7ae60b EP |
1112 | struct nlmsghdr *nlh; |
1113 | /* | |
94191213 | 1114 | * len MUST be signed for nlmsg_next to be able to dec it below 0 |
ea7ae60b EP |
1115 | * if the nlmsg_len was not aligned |
1116 | */ | |
1117 | int len; | |
1118 | int err; | |
1119 | ||
1120 | nlh = nlmsg_hdr(skb); | |
1121 | len = skb->len; | |
1122 | ||
94191213 | 1123 | while (nlmsg_ok(nlh, len)) { |
ea7ae60b EP |
1124 | err = audit_receive_msg(skb, nlh); |
1125 | /* if err or if this message says it wants a response */ | |
1126 | if (err || (nlh->nlmsg_flags & NLM_F_ACK)) | |
1da177e4 | 1127 | netlink_ack(skb, nlh, err); |
ea7ae60b | 1128 | |
2851da57 | 1129 | nlh = nlmsg_next(nlh, &len); |
1da177e4 | 1130 | } |
1da177e4 LT |
1131 | } |
1132 | ||
1133 | /* Receive messages from netlink socket. */ | |
cd40b7d3 | 1134 | static void audit_receive(struct sk_buff *skb) |
1da177e4 | 1135 | { |
f368c07d | 1136 | mutex_lock(&audit_cmd_mutex); |
cd40b7d3 | 1137 | audit_receive_skb(skb); |
f368c07d | 1138 | mutex_unlock(&audit_cmd_mutex); |
1da177e4 LT |
1139 | } |
1140 | ||
3a101b8d | 1141 | /* Run custom bind function on netlink socket group connect or bind requests. */ |
023e2cfa | 1142 | static int audit_bind(struct net *net, int group) |
3a101b8d RGB |
1143 | { |
1144 | if (!capable(CAP_AUDIT_READ)) | |
1145 | return -EPERM; | |
1146 | ||
1147 | return 0; | |
1148 | } | |
1149 | ||
33faba7f | 1150 | static int __net_init audit_net_init(struct net *net) |
1da177e4 | 1151 | { |
a31f2d17 PNA |
1152 | struct netlink_kernel_cfg cfg = { |
1153 | .input = audit_receive, | |
3a101b8d | 1154 | .bind = audit_bind, |
451f9216 RGB |
1155 | .flags = NL_CFG_F_NONROOT_RECV, |
1156 | .groups = AUDIT_NLGRP_MAX, | |
a31f2d17 | 1157 | }; |
f368c07d | 1158 | |
33faba7f RGB |
1159 | struct audit_net *aunet = net_generic(net, audit_net_id); |
1160 | ||
33faba7f | 1161 | aunet->nlsk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg); |
11ee39eb | 1162 | if (aunet->nlsk == NULL) { |
33faba7f | 1163 | audit_panic("cannot initialize netlink socket in namespace"); |
11ee39eb G |
1164 | return -ENOMEM; |
1165 | } | |
1166 | aunet->nlsk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
33faba7f RGB |
1167 | return 0; |
1168 | } | |
1169 | ||
1170 | static void __net_exit audit_net_exit(struct net *net) | |
1171 | { | |
1172 | struct audit_net *aunet = net_generic(net, audit_net_id); | |
1173 | struct sock *sock = aunet->nlsk; | |
1174 | if (sock == audit_sock) { | |
1175 | audit_pid = 0; | |
1176 | audit_sock = NULL; | |
1177 | } | |
1178 | ||
e231d54c | 1179 | RCU_INIT_POINTER(aunet->nlsk, NULL); |
33faba7f RGB |
1180 | synchronize_net(); |
1181 | netlink_kernel_release(sock); | |
1182 | } | |
1183 | ||
8626877b | 1184 | static struct pernet_operations audit_net_ops __net_initdata = { |
33faba7f RGB |
1185 | .init = audit_net_init, |
1186 | .exit = audit_net_exit, | |
1187 | .id = &audit_net_id, | |
1188 | .size = sizeof(struct audit_net), | |
1189 | }; | |
1190 | ||
1191 | /* Initialize audit support at boot time. */ | |
1192 | static int __init audit_init(void) | |
1193 | { | |
1194 | int i; | |
1195 | ||
a3f07114 EP |
1196 | if (audit_initialized == AUDIT_DISABLED) |
1197 | return 0; | |
1198 | ||
d957f7b7 JP |
1199 | pr_info("initializing netlink subsys (%s)\n", |
1200 | audit_default ? "enabled" : "disabled"); | |
33faba7f | 1201 | register_pernet_subsys(&audit_net_ops); |
1da177e4 | 1202 | |
b7d11258 | 1203 | skb_queue_head_init(&audit_skb_queue); |
f3d357b0 | 1204 | skb_queue_head_init(&audit_skb_hold_queue); |
a3f07114 | 1205 | audit_initialized = AUDIT_INITIALIZED; |
1da177e4 | 1206 | audit_enabled = audit_default; |
b593d384 | 1207 | audit_ever_enabled |= !!audit_default; |
3dc7e315 | 1208 | |
f368c07d AG |
1209 | for (i = 0; i < AUDIT_INODE_BUCKETS; i++) |
1210 | INIT_LIST_HEAD(&audit_inode_hash[i]); | |
f368c07d | 1211 | |
6c925564 PM |
1212 | kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd"); |
1213 | if (IS_ERR(kauditd_task)) { | |
1214 | int err = PTR_ERR(kauditd_task); | |
1215 | panic("audit: failed to start the kauditd thread (%d)\n", err); | |
1216 | } | |
1217 | ||
1218 | audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized"); | |
1219 | ||
1da177e4 LT |
1220 | return 0; |
1221 | } | |
1da177e4 LT |
1222 | __initcall(audit_init); |
1223 | ||
1224 | /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */ | |
1225 | static int __init audit_enable(char *str) | |
1226 | { | |
1227 | audit_default = !!simple_strtol(str, NULL, 0); | |
a3f07114 EP |
1228 | if (!audit_default) |
1229 | audit_initialized = AUDIT_DISABLED; | |
1230 | ||
d957f7b7 | 1231 | pr_info("%s\n", audit_default ? |
d3ca0344 | 1232 | "enabled (after initialization)" : "disabled (until reboot)"); |
a3f07114 | 1233 | |
9b41046c | 1234 | return 1; |
1da177e4 | 1235 | } |
1da177e4 LT |
1236 | __setup("audit=", audit_enable); |
1237 | ||
f910fde7 RGB |
1238 | /* Process kernel command-line parameter at boot time. |
1239 | * audit_backlog_limit=<n> */ | |
1240 | static int __init audit_backlog_limit_set(char *str) | |
1241 | { | |
3e1d0bb6 | 1242 | u32 audit_backlog_limit_arg; |
d957f7b7 | 1243 | |
f910fde7 | 1244 | pr_info("audit_backlog_limit: "); |
3e1d0bb6 JP |
1245 | if (kstrtouint(str, 0, &audit_backlog_limit_arg)) { |
1246 | pr_cont("using default of %u, unable to parse %s\n", | |
d957f7b7 | 1247 | audit_backlog_limit, str); |
f910fde7 RGB |
1248 | return 1; |
1249 | } | |
3e1d0bb6 JP |
1250 | |
1251 | audit_backlog_limit = audit_backlog_limit_arg; | |
d957f7b7 | 1252 | pr_cont("%d\n", audit_backlog_limit); |
f910fde7 RGB |
1253 | |
1254 | return 1; | |
1255 | } | |
1256 | __setup("audit_backlog_limit=", audit_backlog_limit_set); | |
1257 | ||
16e1904e CW |
1258 | static void audit_buffer_free(struct audit_buffer *ab) |
1259 | { | |
1260 | unsigned long flags; | |
1261 | ||
8fc6115c CW |
1262 | if (!ab) |
1263 | return; | |
1264 | ||
d865e573 | 1265 | kfree_skb(ab->skb); |
16e1904e | 1266 | spin_lock_irqsave(&audit_freelist_lock, flags); |
5d136a01 | 1267 | if (audit_freelist_count > AUDIT_MAXFREE) |
16e1904e | 1268 | kfree(ab); |
5d136a01 SH |
1269 | else { |
1270 | audit_freelist_count++; | |
16e1904e | 1271 | list_add(&ab->list, &audit_freelist); |
5d136a01 | 1272 | } |
16e1904e CW |
1273 | spin_unlock_irqrestore(&audit_freelist_lock, flags); |
1274 | } | |
1275 | ||
c0404993 | 1276 | static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx, |
dd0fc66f | 1277 | gfp_t gfp_mask, int type) |
16e1904e CW |
1278 | { |
1279 | unsigned long flags; | |
1280 | struct audit_buffer *ab = NULL; | |
c0404993 | 1281 | struct nlmsghdr *nlh; |
16e1904e CW |
1282 | |
1283 | spin_lock_irqsave(&audit_freelist_lock, flags); | |
1284 | if (!list_empty(&audit_freelist)) { | |
1285 | ab = list_entry(audit_freelist.next, | |
1286 | struct audit_buffer, list); | |
1287 | list_del(&ab->list); | |
1288 | --audit_freelist_count; | |
1289 | } | |
1290 | spin_unlock_irqrestore(&audit_freelist_lock, flags); | |
1291 | ||
1292 | if (!ab) { | |
4332bdd3 | 1293 | ab = kmalloc(sizeof(*ab), gfp_mask); |
16e1904e | 1294 | if (!ab) |
8fc6115c | 1295 | goto err; |
16e1904e | 1296 | } |
8fc6115c | 1297 | |
b7d11258 | 1298 | ab->ctx = ctx; |
9ad9ad38 | 1299 | ab->gfp_mask = gfp_mask; |
ee080e6c EP |
1300 | |
1301 | ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask); | |
1302 | if (!ab->skb) | |
c64e66c6 | 1303 | goto err; |
ee080e6c | 1304 | |
c64e66c6 DM |
1305 | nlh = nlmsg_put(ab->skb, 0, 0, type, 0, 0); |
1306 | if (!nlh) | |
1307 | goto out_kfree_skb; | |
ee080e6c | 1308 | |
16e1904e | 1309 | return ab; |
ee080e6c | 1310 | |
c64e66c6 | 1311 | out_kfree_skb: |
ee080e6c EP |
1312 | kfree_skb(ab->skb); |
1313 | ab->skb = NULL; | |
8fc6115c CW |
1314 | err: |
1315 | audit_buffer_free(ab); | |
1316 | return NULL; | |
16e1904e | 1317 | } |
1da177e4 | 1318 | |
b0dd25a8 RD |
1319 | /** |
1320 | * audit_serial - compute a serial number for the audit record | |
1321 | * | |
1322 | * Compute a serial number for the audit record. Audit records are | |
bfb4496e DW |
1323 | * written to user-space as soon as they are generated, so a complete |
1324 | * audit record may be written in several pieces. The timestamp of the | |
1325 | * record and this serial number are used by the user-space tools to | |
1326 | * determine which pieces belong to the same audit record. The | |
1327 | * (timestamp,serial) tuple is unique for each syscall and is live from | |
1328 | * syscall entry to syscall exit. | |
1329 | * | |
bfb4496e DW |
1330 | * NOTE: Another possibility is to store the formatted records off the |
1331 | * audit context (for those records that have a context), and emit them | |
1332 | * all at syscall exit. However, this could delay the reporting of | |
1333 | * significant errors until syscall exit (or never, if the system | |
b0dd25a8 RD |
1334 | * halts). |
1335 | */ | |
bfb4496e DW |
1336 | unsigned int audit_serial(void) |
1337 | { | |
01478d7d | 1338 | static atomic_t serial = ATOMIC_INIT(0); |
d5b454f2 | 1339 | |
01478d7d | 1340 | return atomic_add_return(1, &serial); |
bfb4496e DW |
1341 | } |
1342 | ||
5600b892 | 1343 | static inline void audit_get_stamp(struct audit_context *ctx, |
bfb4496e DW |
1344 | struct timespec *t, unsigned int *serial) |
1345 | { | |
48887e63 | 1346 | if (!ctx || !auditsc_get_stamp(ctx, t, serial)) { |
bfb4496e DW |
1347 | *t = CURRENT_TIME; |
1348 | *serial = audit_serial(); | |
1349 | } | |
1350 | } | |
1351 | ||
82919919 AM |
1352 | /* |
1353 | * Wait for auditd to drain the queue a little | |
1354 | */ | |
c81825dd | 1355 | static long wait_for_auditd(long sleep_time) |
82919919 AM |
1356 | { |
1357 | DECLARE_WAITQUEUE(wait, current); | |
82919919 AM |
1358 | |
1359 | if (audit_backlog_limit && | |
7ffb8e31 PM |
1360 | skb_queue_len(&audit_skb_queue) > audit_backlog_limit) { |
1361 | add_wait_queue_exclusive(&audit_backlog_wait, &wait); | |
1362 | set_current_state(TASK_UNINTERRUPTIBLE); | |
c81825dd | 1363 | sleep_time = schedule_timeout(sleep_time); |
7ffb8e31 PM |
1364 | remove_wait_queue(&audit_backlog_wait, &wait); |
1365 | } | |
ae887e0b | 1366 | |
c81825dd | 1367 | return sleep_time; |
82919919 AM |
1368 | } |
1369 | ||
b0dd25a8 RD |
1370 | /** |
1371 | * audit_log_start - obtain an audit buffer | |
1372 | * @ctx: audit_context (may be NULL) | |
1373 | * @gfp_mask: type of allocation | |
1374 | * @type: audit message type | |
1375 | * | |
1376 | * Returns audit_buffer pointer on success or NULL on error. | |
1377 | * | |
1378 | * Obtain an audit buffer. This routine does locking to obtain the | |
1379 | * audit buffer, but then no locking is required for calls to | |
1380 | * audit_log_*format. If the task (ctx) is a task that is currently in a | |
1381 | * syscall, then the syscall is marked as auditable and an audit record | |
1382 | * will be written at syscall exit. If there is no associated task, then | |
1383 | * task context (ctx) should be NULL. | |
1384 | */ | |
9796fdd8 | 1385 | struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, |
9ad9ad38 | 1386 | int type) |
1da177e4 LT |
1387 | { |
1388 | struct audit_buffer *ab = NULL; | |
1da177e4 | 1389 | struct timespec t; |
ef00be05 | 1390 | unsigned int uninitialized_var(serial); |
6dd80aba TO |
1391 | int reserve = 5; /* Allow atomic callers to go up to five |
1392 | entries over the normal backlog limit */ | |
ac4cec44 | 1393 | unsigned long timeout_start = jiffies; |
1da177e4 | 1394 | |
a3f07114 | 1395 | if (audit_initialized != AUDIT_INITIALIZED) |
1da177e4 LT |
1396 | return NULL; |
1397 | ||
86b2efbe | 1398 | if (unlikely(!audit_filter(type, AUDIT_FILTER_TYPE))) |
c8edc80c DK |
1399 | return NULL; |
1400 | ||
d0164adc | 1401 | if (gfp_mask & __GFP_DIRECT_RECLAIM) { |
f48a9429 | 1402 | if (audit_pid && audit_pid == current->tgid) |
d0164adc | 1403 | gfp_mask &= ~__GFP_DIRECT_RECLAIM; |
6dd80aba TO |
1404 | else |
1405 | reserve = 0; | |
1406 | } | |
9ad9ad38 DW |
1407 | |
1408 | while (audit_backlog_limit | |
1409 | && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) { | |
d0164adc | 1410 | if (gfp_mask & __GFP_DIRECT_RECLAIM && audit_backlog_wait_time) { |
c81825dd | 1411 | long sleep_time; |
9ad9ad38 | 1412 | |
c81825dd EP |
1413 | sleep_time = timeout_start + audit_backlog_wait_time - jiffies; |
1414 | if (sleep_time > 0) { | |
ae887e0b | 1415 | sleep_time = wait_for_auditd(sleep_time); |
c81825dd | 1416 | if (sleep_time > 0) |
ae887e0b | 1417 | continue; |
8ac1c8d5 | 1418 | } |
9ad9ad38 | 1419 | } |
320f1b1e | 1420 | if (audit_rate_check() && printk_ratelimit()) |
d957f7b7 JP |
1421 | pr_warn("audit_backlog=%d > audit_backlog_limit=%d\n", |
1422 | skb_queue_len(&audit_skb_queue), | |
1423 | audit_backlog_limit); | |
fb19b4c6 | 1424 | audit_log_lost("backlog limit exceeded"); |
eb8baf6a | 1425 | audit_backlog_wait_time = 0; |
ac4cec44 | 1426 | wake_up(&audit_backlog_wait); |
fb19b4c6 DW |
1427 | return NULL; |
1428 | } | |
1429 | ||
c4b7a775 | 1430 | if (!reserve && !audit_backlog_wait_time) |
efef73a1 | 1431 | audit_backlog_wait_time = audit_backlog_wait_time_master; |
e789e561 | 1432 | |
9ad9ad38 | 1433 | ab = audit_buffer_alloc(ctx, gfp_mask, type); |
1da177e4 LT |
1434 | if (!ab) { |
1435 | audit_log_lost("out of memory in audit_log_start"); | |
1436 | return NULL; | |
1437 | } | |
1438 | ||
bfb4496e | 1439 | audit_get_stamp(ab->ctx, &t, &serial); |
197c69c6 | 1440 | |
1da177e4 LT |
1441 | audit_log_format(ab, "audit(%lu.%03lu:%u): ", |
1442 | t.tv_sec, t.tv_nsec/1000000, serial); | |
1443 | return ab; | |
1444 | } | |
1445 | ||
8fc6115c | 1446 | /** |
5ac52f33 | 1447 | * audit_expand - expand skb in the audit buffer |
8fc6115c | 1448 | * @ab: audit_buffer |
b0dd25a8 | 1449 | * @extra: space to add at tail of the skb |
8fc6115c CW |
1450 | * |
1451 | * Returns 0 (no space) on failed expansion, or available space if | |
1452 | * successful. | |
1453 | */ | |
e3b926b4 | 1454 | static inline int audit_expand(struct audit_buffer *ab, int extra) |
8fc6115c | 1455 | { |
5ac52f33 | 1456 | struct sk_buff *skb = ab->skb; |
406a1d86 HX |
1457 | int oldtail = skb_tailroom(skb); |
1458 | int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask); | |
1459 | int newtail = skb_tailroom(skb); | |
1460 | ||
5ac52f33 CW |
1461 | if (ret < 0) { |
1462 | audit_log_lost("out of memory in audit_expand"); | |
8fc6115c | 1463 | return 0; |
5ac52f33 | 1464 | } |
406a1d86 HX |
1465 | |
1466 | skb->truesize += newtail - oldtail; | |
1467 | return newtail; | |
8fc6115c | 1468 | } |
1da177e4 | 1469 | |
b0dd25a8 RD |
1470 | /* |
1471 | * Format an audit message into the audit buffer. If there isn't enough | |
1da177e4 LT |
1472 | * room in the audit buffer, more room will be allocated and vsnprint |
1473 | * will be called a second time. Currently, we assume that a printk | |
b0dd25a8 RD |
1474 | * can't format message larger than 1024 bytes, so we don't either. |
1475 | */ | |
1da177e4 LT |
1476 | static void audit_log_vformat(struct audit_buffer *ab, const char *fmt, |
1477 | va_list args) | |
1478 | { | |
1479 | int len, avail; | |
5ac52f33 | 1480 | struct sk_buff *skb; |
eecb0a73 | 1481 | va_list args2; |
1da177e4 LT |
1482 | |
1483 | if (!ab) | |
1484 | return; | |
1485 | ||
5ac52f33 CW |
1486 | BUG_ON(!ab->skb); |
1487 | skb = ab->skb; | |
1488 | avail = skb_tailroom(skb); | |
1489 | if (avail == 0) { | |
e3b926b4 | 1490 | avail = audit_expand(ab, AUDIT_BUFSIZ); |
8fc6115c CW |
1491 | if (!avail) |
1492 | goto out; | |
1da177e4 | 1493 | } |
eecb0a73 | 1494 | va_copy(args2, args); |
27a884dc | 1495 | len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args); |
1da177e4 LT |
1496 | if (len >= avail) { |
1497 | /* The printk buffer is 1024 bytes long, so if we get | |
1498 | * here and AUDIT_BUFSIZ is at least 1024, then we can | |
1499 | * log everything that printk could have logged. */ | |
b0dd25a8 RD |
1500 | avail = audit_expand(ab, |
1501 | max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail)); | |
8fc6115c | 1502 | if (!avail) |
a0e86bd4 | 1503 | goto out_va_end; |
27a884dc | 1504 | len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2); |
1da177e4 | 1505 | } |
168b7173 SG |
1506 | if (len > 0) |
1507 | skb_put(skb, len); | |
a0e86bd4 JJ |
1508 | out_va_end: |
1509 | va_end(args2); | |
8fc6115c CW |
1510 | out: |
1511 | return; | |
1da177e4 LT |
1512 | } |
1513 | ||
b0dd25a8 RD |
1514 | /** |
1515 | * audit_log_format - format a message into the audit buffer. | |
1516 | * @ab: audit_buffer | |
1517 | * @fmt: format string | |
1518 | * @...: optional parameters matching @fmt string | |
1519 | * | |
1520 | * All the work is done in audit_log_vformat. | |
1521 | */ | |
1da177e4 LT |
1522 | void audit_log_format(struct audit_buffer *ab, const char *fmt, ...) |
1523 | { | |
1524 | va_list args; | |
1525 | ||
1526 | if (!ab) | |
1527 | return; | |
1528 | va_start(args, fmt); | |
1529 | audit_log_vformat(ab, fmt, args); | |
1530 | va_end(args); | |
1531 | } | |
1532 | ||
b0dd25a8 RD |
1533 | /** |
1534 | * audit_log_hex - convert a buffer to hex and append it to the audit skb | |
1535 | * @ab: the audit_buffer | |
1536 | * @buf: buffer to convert to hex | |
1537 | * @len: length of @buf to be converted | |
1538 | * | |
1539 | * No return value; failure to expand is silently ignored. | |
1540 | * | |
1541 | * This function will take the passed buf and convert it into a string of | |
1542 | * ascii hex digits. The new string is placed onto the skb. | |
1543 | */ | |
b556f8ad | 1544 | void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf, |
168b7173 | 1545 | size_t len) |
83c7d091 | 1546 | { |
168b7173 SG |
1547 | int i, avail, new_len; |
1548 | unsigned char *ptr; | |
1549 | struct sk_buff *skb; | |
168b7173 | 1550 | |
8ef2d304 AG |
1551 | if (!ab) |
1552 | return; | |
1553 | ||
168b7173 SG |
1554 | BUG_ON(!ab->skb); |
1555 | skb = ab->skb; | |
1556 | avail = skb_tailroom(skb); | |
1557 | new_len = len<<1; | |
1558 | if (new_len >= avail) { | |
1559 | /* Round the buffer request up to the next multiple */ | |
1560 | new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1); | |
1561 | avail = audit_expand(ab, new_len); | |
1562 | if (!avail) | |
1563 | return; | |
1564 | } | |
83c7d091 | 1565 | |
27a884dc | 1566 | ptr = skb_tail_pointer(skb); |
b8dbc324 JP |
1567 | for (i = 0; i < len; i++) |
1568 | ptr = hex_byte_pack_upper(ptr, buf[i]); | |
168b7173 SG |
1569 | *ptr = 0; |
1570 | skb_put(skb, len << 1); /* new string is twice the old string */ | |
83c7d091 | 1571 | } |
1572 | ||
9c937dcc AG |
1573 | /* |
1574 | * Format a string of no more than slen characters into the audit buffer, | |
1575 | * enclosed in quote marks. | |
1576 | */ | |
b556f8ad EP |
1577 | void audit_log_n_string(struct audit_buffer *ab, const char *string, |
1578 | size_t slen) | |
9c937dcc AG |
1579 | { |
1580 | int avail, new_len; | |
1581 | unsigned char *ptr; | |
1582 | struct sk_buff *skb; | |
1583 | ||
8ef2d304 AG |
1584 | if (!ab) |
1585 | return; | |
1586 | ||
9c937dcc AG |
1587 | BUG_ON(!ab->skb); |
1588 | skb = ab->skb; | |
1589 | avail = skb_tailroom(skb); | |
1590 | new_len = slen + 3; /* enclosing quotes + null terminator */ | |
1591 | if (new_len > avail) { | |
1592 | avail = audit_expand(ab, new_len); | |
1593 | if (!avail) | |
1594 | return; | |
1595 | } | |
27a884dc | 1596 | ptr = skb_tail_pointer(skb); |
9c937dcc AG |
1597 | *ptr++ = '"'; |
1598 | memcpy(ptr, string, slen); | |
1599 | ptr += slen; | |
1600 | *ptr++ = '"'; | |
1601 | *ptr = 0; | |
1602 | skb_put(skb, slen + 2); /* don't include null terminator */ | |
1603 | } | |
1604 | ||
de6bbd1d EP |
1605 | /** |
1606 | * audit_string_contains_control - does a string need to be logged in hex | |
f706d5d2 DJ |
1607 | * @string: string to be checked |
1608 | * @len: max length of the string to check | |
de6bbd1d | 1609 | */ |
9fcf836b | 1610 | bool audit_string_contains_control(const char *string, size_t len) |
de6bbd1d EP |
1611 | { |
1612 | const unsigned char *p; | |
b3897f56 | 1613 | for (p = string; p < (const unsigned char *)string + len; p++) { |
1d6c9649 | 1614 | if (*p == '"' || *p < 0x21 || *p > 0x7e) |
9fcf836b | 1615 | return true; |
de6bbd1d | 1616 | } |
9fcf836b | 1617 | return false; |
de6bbd1d EP |
1618 | } |
1619 | ||
b0dd25a8 | 1620 | /** |
522ed776 | 1621 | * audit_log_n_untrustedstring - log a string that may contain random characters |
b0dd25a8 | 1622 | * @ab: audit_buffer |
f706d5d2 | 1623 | * @len: length of string (not including trailing null) |
b0dd25a8 RD |
1624 | * @string: string to be logged |
1625 | * | |
1626 | * This code will escape a string that is passed to it if the string | |
1627 | * contains a control character, unprintable character, double quote mark, | |
168b7173 | 1628 | * or a space. Unescaped strings will start and end with a double quote mark. |
b0dd25a8 | 1629 | * Strings that are escaped are printed in hex (2 digits per char). |
9c937dcc AG |
1630 | * |
1631 | * The caller specifies the number of characters in the string to log, which may | |
1632 | * or may not be the entire string. | |
b0dd25a8 | 1633 | */ |
b556f8ad EP |
1634 | void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string, |
1635 | size_t len) | |
83c7d091 | 1636 | { |
de6bbd1d | 1637 | if (audit_string_contains_control(string, len)) |
b556f8ad | 1638 | audit_log_n_hex(ab, string, len); |
de6bbd1d | 1639 | else |
b556f8ad | 1640 | audit_log_n_string(ab, string, len); |
83c7d091 | 1641 | } |
1642 | ||
9c937dcc | 1643 | /** |
522ed776 | 1644 | * audit_log_untrustedstring - log a string that may contain random characters |
9c937dcc AG |
1645 | * @ab: audit_buffer |
1646 | * @string: string to be logged | |
1647 | * | |
522ed776 | 1648 | * Same as audit_log_n_untrustedstring(), except that strlen is used to |
9c937dcc AG |
1649 | * determine string length. |
1650 | */ | |
de6bbd1d | 1651 | void audit_log_untrustedstring(struct audit_buffer *ab, const char *string) |
9c937dcc | 1652 | { |
b556f8ad | 1653 | audit_log_n_untrustedstring(ab, string, strlen(string)); |
9c937dcc AG |
1654 | } |
1655 | ||
168b7173 | 1656 | /* This is a helper-function to print the escaped d_path */ |
1da177e4 | 1657 | void audit_log_d_path(struct audit_buffer *ab, const char *prefix, |
66b3fad3 | 1658 | const struct path *path) |
1da177e4 | 1659 | { |
44707fdf | 1660 | char *p, *pathname; |
1da177e4 | 1661 | |
8fc6115c | 1662 | if (prefix) |
c158a35c | 1663 | audit_log_format(ab, "%s", prefix); |
1da177e4 | 1664 | |
168b7173 | 1665 | /* We will allow 11 spaces for ' (deleted)' to be appended */ |
44707fdf JB |
1666 | pathname = kmalloc(PATH_MAX+11, ab->gfp_mask); |
1667 | if (!pathname) { | |
def57543 | 1668 | audit_log_string(ab, "<no_memory>"); |
168b7173 | 1669 | return; |
1da177e4 | 1670 | } |
cf28b486 | 1671 | p = d_path(path, pathname, PATH_MAX+11); |
168b7173 SG |
1672 | if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */ |
1673 | /* FIXME: can we save some information here? */ | |
def57543 | 1674 | audit_log_string(ab, "<too_long>"); |
5600b892 | 1675 | } else |
168b7173 | 1676 | audit_log_untrustedstring(ab, p); |
44707fdf | 1677 | kfree(pathname); |
1da177e4 LT |
1678 | } |
1679 | ||
4d3fb709 EP |
1680 | void audit_log_session_info(struct audit_buffer *ab) |
1681 | { | |
4440e854 | 1682 | unsigned int sessionid = audit_get_sessionid(current); |
4d3fb709 EP |
1683 | uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current)); |
1684 | ||
b8f89caa | 1685 | audit_log_format(ab, " auid=%u ses=%u", auid, sessionid); |
4d3fb709 EP |
1686 | } |
1687 | ||
9d960985 EP |
1688 | void audit_log_key(struct audit_buffer *ab, char *key) |
1689 | { | |
1690 | audit_log_format(ab, " key="); | |
1691 | if (key) | |
1692 | audit_log_untrustedstring(ab, key); | |
1693 | else | |
1694 | audit_log_format(ab, "(null)"); | |
1695 | } | |
1696 | ||
b24a30a7 EP |
1697 | void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap) |
1698 | { | |
1699 | int i; | |
1700 | ||
1701 | audit_log_format(ab, " %s=", prefix); | |
1702 | CAP_FOR_EACH_U32(i) { | |
1703 | audit_log_format(ab, "%08x", | |
7d8b6c63 | 1704 | cap->cap[CAP_LAST_U32 - i]); |
b24a30a7 EP |
1705 | } |
1706 | } | |
1707 | ||
691e6d59 | 1708 | static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) |
b24a30a7 EP |
1709 | { |
1710 | kernel_cap_t *perm = &name->fcap.permitted; | |
1711 | kernel_cap_t *inh = &name->fcap.inheritable; | |
1712 | int log = 0; | |
1713 | ||
1714 | if (!cap_isclear(*perm)) { | |
1715 | audit_log_cap(ab, "cap_fp", perm); | |
1716 | log = 1; | |
1717 | } | |
1718 | if (!cap_isclear(*inh)) { | |
1719 | audit_log_cap(ab, "cap_fi", inh); | |
1720 | log = 1; | |
1721 | } | |
1722 | ||
1723 | if (log) | |
1724 | audit_log_format(ab, " cap_fe=%d cap_fver=%x", | |
1725 | name->fcap.fE, name->fcap_ver); | |
1726 | } | |
1727 | ||
1728 | static inline int audit_copy_fcaps(struct audit_names *name, | |
1729 | const struct dentry *dentry) | |
1730 | { | |
1731 | struct cpu_vfs_cap_data caps; | |
1732 | int rc; | |
1733 | ||
1734 | if (!dentry) | |
1735 | return 0; | |
1736 | ||
1737 | rc = get_vfs_caps_from_disk(dentry, &caps); | |
1738 | if (rc) | |
1739 | return rc; | |
1740 | ||
1741 | name->fcap.permitted = caps.permitted; | |
1742 | name->fcap.inheritable = caps.inheritable; | |
1743 | name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); | |
1744 | name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> | |
1745 | VFS_CAP_REVISION_SHIFT; | |
1746 | ||
1747 | return 0; | |
1748 | } | |
1749 | ||
1750 | /* Copy inode data into an audit_names. */ | |
1751 | void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, | |
d6335d77 | 1752 | struct inode *inode) |
b24a30a7 EP |
1753 | { |
1754 | name->ino = inode->i_ino; | |
1755 | name->dev = inode->i_sb->s_dev; | |
1756 | name->mode = inode->i_mode; | |
1757 | name->uid = inode->i_uid; | |
1758 | name->gid = inode->i_gid; | |
1759 | name->rdev = inode->i_rdev; | |
1760 | security_inode_getsecid(inode, &name->osid); | |
1761 | audit_copy_fcaps(name, dentry); | |
1762 | } | |
1763 | ||
1764 | /** | |
1765 | * audit_log_name - produce AUDIT_PATH record from struct audit_names | |
1766 | * @context: audit_context for the task | |
1767 | * @n: audit_names structure with reportable details | |
1768 | * @path: optional path to report instead of audit_names->name | |
1769 | * @record_num: record number to report when handling a list of names | |
1770 | * @call_panic: optional pointer to int that will be updated if secid fails | |
1771 | */ | |
1772 | void audit_log_name(struct audit_context *context, struct audit_names *n, | |
1773 | struct path *path, int record_num, int *call_panic) | |
1774 | { | |
1775 | struct audit_buffer *ab; | |
1776 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); | |
1777 | if (!ab) | |
1778 | return; | |
1779 | ||
1780 | audit_log_format(ab, "item=%d", record_num); | |
1781 | ||
1782 | if (path) | |
1783 | audit_log_d_path(ab, " name=", path); | |
1784 | else if (n->name) { | |
1785 | switch (n->name_len) { | |
1786 | case AUDIT_NAME_FULL: | |
1787 | /* log the full path */ | |
1788 | audit_log_format(ab, " name="); | |
1789 | audit_log_untrustedstring(ab, n->name->name); | |
1790 | break; | |
1791 | case 0: | |
1792 | /* name was specified as a relative path and the | |
1793 | * directory component is the cwd */ | |
1794 | audit_log_d_path(ab, " name=", &context->pwd); | |
1795 | break; | |
1796 | default: | |
1797 | /* log the name's directory component */ | |
1798 | audit_log_format(ab, " name="); | |
1799 | audit_log_n_untrustedstring(ab, n->name->name, | |
1800 | n->name_len); | |
1801 | } | |
1802 | } else | |
1803 | audit_log_format(ab, " name=(null)"); | |
1804 | ||
425afcff | 1805 | if (n->ino != AUDIT_INO_UNSET) |
b24a30a7 EP |
1806 | audit_log_format(ab, " inode=%lu" |
1807 | " dev=%02x:%02x mode=%#ho" | |
1808 | " ouid=%u ogid=%u rdev=%02x:%02x", | |
1809 | n->ino, | |
1810 | MAJOR(n->dev), | |
1811 | MINOR(n->dev), | |
1812 | n->mode, | |
1813 | from_kuid(&init_user_ns, n->uid), | |
1814 | from_kgid(&init_user_ns, n->gid), | |
1815 | MAJOR(n->rdev), | |
1816 | MINOR(n->rdev)); | |
b24a30a7 EP |
1817 | if (n->osid != 0) { |
1818 | char *ctx = NULL; | |
1819 | u32 len; | |
1820 | if (security_secid_to_secctx( | |
1821 | n->osid, &ctx, &len)) { | |
1822 | audit_log_format(ab, " osid=%u", n->osid); | |
1823 | if (call_panic) | |
1824 | *call_panic = 2; | |
1825 | } else { | |
1826 | audit_log_format(ab, " obj=%s", ctx); | |
1827 | security_release_secctx(ctx, len); | |
1828 | } | |
1829 | } | |
1830 | ||
d3aea84a JL |
1831 | /* log the audit_names record type */ |
1832 | audit_log_format(ab, " nametype="); | |
1833 | switch(n->type) { | |
1834 | case AUDIT_TYPE_NORMAL: | |
1835 | audit_log_format(ab, "NORMAL"); | |
1836 | break; | |
1837 | case AUDIT_TYPE_PARENT: | |
1838 | audit_log_format(ab, "PARENT"); | |
1839 | break; | |
1840 | case AUDIT_TYPE_CHILD_DELETE: | |
1841 | audit_log_format(ab, "DELETE"); | |
1842 | break; | |
1843 | case AUDIT_TYPE_CHILD_CREATE: | |
1844 | audit_log_format(ab, "CREATE"); | |
1845 | break; | |
1846 | default: | |
1847 | audit_log_format(ab, "UNKNOWN"); | |
1848 | break; | |
1849 | } | |
1850 | ||
b24a30a7 EP |
1851 | audit_log_fcaps(ab, n); |
1852 | audit_log_end(ab); | |
1853 | } | |
1854 | ||
1855 | int audit_log_task_context(struct audit_buffer *ab) | |
1856 | { | |
1857 | char *ctx = NULL; | |
1858 | unsigned len; | |
1859 | int error; | |
1860 | u32 sid; | |
1861 | ||
1862 | security_task_getsecid(current, &sid); | |
1863 | if (!sid) | |
1864 | return 0; | |
1865 | ||
1866 | error = security_secid_to_secctx(sid, &ctx, &len); | |
1867 | if (error) { | |
1868 | if (error != -EINVAL) | |
1869 | goto error_path; | |
1870 | return 0; | |
1871 | } | |
1872 | ||
1873 | audit_log_format(ab, " subj=%s", ctx); | |
1874 | security_release_secctx(ctx, len); | |
1875 | return 0; | |
1876 | ||
1877 | error_path: | |
1878 | audit_panic("error in audit_log_task_context"); | |
1879 | return error; | |
1880 | } | |
1881 | EXPORT_SYMBOL(audit_log_task_context); | |
1882 | ||
4766b199 DB |
1883 | void audit_log_d_path_exe(struct audit_buffer *ab, |
1884 | struct mm_struct *mm) | |
1885 | { | |
5b282552 DB |
1886 | struct file *exe_file; |
1887 | ||
1888 | if (!mm) | |
1889 | goto out_null; | |
4766b199 | 1890 | |
5b282552 DB |
1891 | exe_file = get_mm_exe_file(mm); |
1892 | if (!exe_file) | |
1893 | goto out_null; | |
1894 | ||
1895 | audit_log_d_path(ab, " exe=", &exe_file->f_path); | |
1896 | fput(exe_file); | |
1897 | return; | |
1898 | out_null: | |
1899 | audit_log_format(ab, " exe=(null)"); | |
4766b199 DB |
1900 | } |
1901 | ||
3f5be2da RGB |
1902 | struct tty_struct *audit_get_tty(struct task_struct *tsk) |
1903 | { | |
1904 | struct tty_struct *tty = NULL; | |
1905 | unsigned long flags; | |
1906 | ||
1907 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
1908 | if (tsk->signal) | |
1909 | tty = tty_kref_get(tsk->signal->tty); | |
1910 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
1911 | return tty; | |
1912 | } | |
1913 | ||
1914 | void audit_put_tty(struct tty_struct *tty) | |
1915 | { | |
1916 | tty_kref_put(tty); | |
1917 | } | |
1918 | ||
b24a30a7 EP |
1919 | void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
1920 | { | |
1921 | const struct cred *cred; | |
9eab339b | 1922 | char comm[sizeof(tsk->comm)]; |
db0a6fb5 | 1923 | struct tty_struct *tty; |
b24a30a7 EP |
1924 | |
1925 | if (!ab) | |
1926 | return; | |
1927 | ||
1928 | /* tsk == current */ | |
1929 | cred = current_cred(); | |
db0a6fb5 | 1930 | tty = audit_get_tty(tsk); |
b24a30a7 | 1931 | audit_log_format(ab, |
c92cdeb4 | 1932 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
b24a30a7 | 1933 | " euid=%u suid=%u fsuid=%u" |
2f2ad101 | 1934 | " egid=%u sgid=%u fsgid=%u tty=%s ses=%u", |
c92cdeb4 | 1935 | task_ppid_nr(tsk), |
f1dc4867 | 1936 | task_pid_nr(tsk), |
b24a30a7 EP |
1937 | from_kuid(&init_user_ns, audit_get_loginuid(tsk)), |
1938 | from_kuid(&init_user_ns, cred->uid), | |
1939 | from_kgid(&init_user_ns, cred->gid), | |
1940 | from_kuid(&init_user_ns, cred->euid), | |
1941 | from_kuid(&init_user_ns, cred->suid), | |
1942 | from_kuid(&init_user_ns, cred->fsuid), | |
1943 | from_kgid(&init_user_ns, cred->egid), | |
1944 | from_kgid(&init_user_ns, cred->sgid), | |
1945 | from_kgid(&init_user_ns, cred->fsgid), | |
db0a6fb5 RGB |
1946 | tty ? tty_name(tty) : "(none)", |
1947 | audit_get_sessionid(tsk)); | |
1948 | audit_put_tty(tty); | |
b24a30a7 | 1949 | audit_log_format(ab, " comm="); |
9eab339b | 1950 | audit_log_untrustedstring(ab, get_task_comm(comm, tsk)); |
4766b199 | 1951 | audit_log_d_path_exe(ab, tsk->mm); |
b24a30a7 EP |
1952 | audit_log_task_context(ab); |
1953 | } | |
1954 | EXPORT_SYMBOL(audit_log_task_info); | |
1955 | ||
a51d9eaa KC |
1956 | /** |
1957 | * audit_log_link_denied - report a link restriction denial | |
22011964 | 1958 | * @operation: specific link operation |
a51d9eaa KC |
1959 | * @link: the path that triggered the restriction |
1960 | */ | |
1961 | void audit_log_link_denied(const char *operation, struct path *link) | |
1962 | { | |
1963 | struct audit_buffer *ab; | |
b24a30a7 EP |
1964 | struct audit_names *name; |
1965 | ||
1966 | name = kzalloc(sizeof(*name), GFP_NOFS); | |
1967 | if (!name) | |
1968 | return; | |
a51d9eaa | 1969 | |
b24a30a7 | 1970 | /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */ |
a51d9eaa KC |
1971 | ab = audit_log_start(current->audit_context, GFP_KERNEL, |
1972 | AUDIT_ANOM_LINK); | |
d1c7d97a | 1973 | if (!ab) |
b24a30a7 EP |
1974 | goto out; |
1975 | audit_log_format(ab, "op=%s", operation); | |
1976 | audit_log_task_info(ab, current); | |
1977 | audit_log_format(ab, " res=0"); | |
a51d9eaa | 1978 | audit_log_end(ab); |
b24a30a7 EP |
1979 | |
1980 | /* Generate AUDIT_PATH record with object. */ | |
1981 | name->type = AUDIT_TYPE_NORMAL; | |
3b362157 | 1982 | audit_copy_inode(name, link->dentry, d_backing_inode(link->dentry)); |
b24a30a7 EP |
1983 | audit_log_name(current->audit_context, name, link, 0, NULL); |
1984 | out: | |
1985 | kfree(name); | |
a51d9eaa KC |
1986 | } |
1987 | ||
b0dd25a8 RD |
1988 | /** |
1989 | * audit_log_end - end one audit record | |
1990 | * @ab: the audit_buffer | |
1991 | * | |
4aa83872 PM |
1992 | * We can not do a netlink send inside an irq context because it blocks (last |
1993 | * arg, flags, is not set to MSG_DONTWAIT), so the audit buffer is placed on a | |
1994 | * queue and a tasklet is scheduled to remove them from the queue outside the | |
1995 | * irq context. May be called in any context. | |
b0dd25a8 | 1996 | */ |
b7d11258 | 1997 | void audit_log_end(struct audit_buffer *ab) |
1da177e4 | 1998 | { |
1da177e4 LT |
1999 | if (!ab) |
2000 | return; | |
2001 | if (!audit_rate_check()) { | |
2002 | audit_log_lost("rate limit exceeded"); | |
2003 | } else { | |
4aa83872 PM |
2004 | skb_queue_tail(&audit_skb_queue, ab->skb); |
2005 | wake_up_interruptible(&kauditd_wait); | |
f3d357b0 | 2006 | ab->skb = NULL; |
1da177e4 | 2007 | } |
16e1904e | 2008 | audit_buffer_free(ab); |
1da177e4 LT |
2009 | } |
2010 | ||
b0dd25a8 RD |
2011 | /** |
2012 | * audit_log - Log an audit record | |
2013 | * @ctx: audit context | |
2014 | * @gfp_mask: type of allocation | |
2015 | * @type: audit message type | |
2016 | * @fmt: format string to use | |
2017 | * @...: variable parameters matching the format string | |
2018 | * | |
2019 | * This is a convenience function that calls audit_log_start, | |
2020 | * audit_log_vformat, and audit_log_end. It may be called | |
2021 | * in any context. | |
2022 | */ | |
5600b892 | 2023 | void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, |
9ad9ad38 | 2024 | const char *fmt, ...) |
1da177e4 LT |
2025 | { |
2026 | struct audit_buffer *ab; | |
2027 | va_list args; | |
2028 | ||
9ad9ad38 | 2029 | ab = audit_log_start(ctx, gfp_mask, type); |
1da177e4 LT |
2030 | if (ab) { |
2031 | va_start(args, fmt); | |
2032 | audit_log_vformat(ab, fmt, args); | |
2033 | va_end(args); | |
2034 | audit_log_end(ab); | |
2035 | } | |
2036 | } | |
bf45da97 | 2037 | |
131ad62d MDF |
2038 | #ifdef CONFIG_SECURITY |
2039 | /** | |
2040 | * audit_log_secctx - Converts and logs SELinux context | |
2041 | * @ab: audit_buffer | |
2042 | * @secid: security number | |
2043 | * | |
2044 | * This is a helper function that calls security_secid_to_secctx to convert | |
2045 | * secid to secctx and then adds the (converted) SELinux context to the audit | |
2046 | * log by calling audit_log_format, thus also preventing leak of internal secid | |
2047 | * to userspace. If secid cannot be converted audit_panic is called. | |
2048 | */ | |
2049 | void audit_log_secctx(struct audit_buffer *ab, u32 secid) | |
2050 | { | |
2051 | u32 len; | |
2052 | char *secctx; | |
2053 | ||
2054 | if (security_secid_to_secctx(secid, &secctx, &len)) { | |
2055 | audit_panic("Cannot convert secid to context"); | |
2056 | } else { | |
2057 | audit_log_format(ab, " obj=%s", secctx); | |
2058 | security_release_secctx(secctx, len); | |
2059 | } | |
2060 | } | |
2061 | EXPORT_SYMBOL(audit_log_secctx); | |
2062 | #endif | |
2063 | ||
bf45da97 | 2064 | EXPORT_SYMBOL(audit_log_start); |
2065 | EXPORT_SYMBOL(audit_log_end); | |
2066 | EXPORT_SYMBOL(audit_log_format); | |
2067 | EXPORT_SYMBOL(audit_log); |