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43
44#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
45
46#include <linux/init.h>
47#include <asm/types.h>
48#include <linux/atomic.h>
49#include <linux/mm.h>
50#include <linux/export.h>
51#include <linux/slab.h>
52#include <linux/err.h>
53#include <linux/kthread.h>
54#include <linux/kernel.h>
55#include <linux/syscalls.h>
56
57#include <linux/audit.h>
58
59#include <net/sock.h>
60#include <net/netlink.h>
61#include <linux/skbuff.h>
62#ifdef CONFIG_SECURITY
63#include <linux/security.h>
64#endif
65#include <linux/freezer.h>
66#include <linux/tty.h>
67#include <linux/pid_namespace.h>
68#include <net/netns/generic.h>
69
70#include "audit.h"
71
72
73
74#define AUDIT_DISABLED -1
75#define AUDIT_UNINITIALIZED 0
76#define AUDIT_INITIALIZED 1
77static int audit_initialized;
78
79#define AUDIT_OFF 0
80#define AUDIT_ON 1
81#define AUDIT_LOCKED 2
82u32 audit_enabled;
83u32 audit_ever_enabled;
84
85EXPORT_SYMBOL_GPL(audit_enabled);
86
87
88static u32 audit_default;
89
90
91static u32 audit_failure = AUDIT_FAIL_PRINTK;
92
93
94
95
96
97
98int audit_pid;
99static __u32 audit_nlk_portid;
100
101
102
103
104static u32 audit_rate_limit;
105
106
107
108static u32 audit_backlog_limit = 64;
109#define AUDIT_BACKLOG_WAIT_TIME (60 * HZ)
110static u32 audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
111static u32 audit_backlog_wait_overflow = 0;
112
113
114kuid_t audit_sig_uid = INVALID_UID;
115pid_t audit_sig_pid = -1;
116u32 audit_sig_sid = 0;
117
118
119
120
121
122
123
124
125static atomic_t audit_lost = ATOMIC_INIT(0);
126
127
128static struct sock *audit_sock;
129int audit_net_id;
130
131
132struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
133
134
135
136
137static DEFINE_SPINLOCK(audit_freelist_lock);
138static int audit_freelist_count;
139static LIST_HEAD(audit_freelist);
140
141static struct sk_buff_head audit_skb_queue;
142
143static struct sk_buff_head audit_skb_hold_queue;
144static struct task_struct *kauditd_task;
145static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
146static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
147
148static struct audit_features af = {.vers = AUDIT_FEATURE_VERSION,
149 .mask = -1,
150 .features = 0,
151 .lock = 0,};
152
153static char *audit_feature_names[2] = {
154 "only_unset_loginuid",
155 "loginuid_immutable",
156};
157
158
159
160DEFINE_MUTEX(audit_cmd_mutex);
161
162
163
164
165#define AUDIT_BUFSIZ 1024
166
167
168
169#define AUDIT_MAXFREE (2*NR_CPUS)
170
171
172
173
174
175
176struct audit_buffer {
177 struct list_head list;
178 struct sk_buff *skb;
179 struct audit_context *ctx;
180 gfp_t gfp_mask;
181};
182
183struct audit_reply {
184 __u32 portid;
185 struct net *net;
186 struct sk_buff *skb;
187};
188
189static void audit_set_portid(struct audit_buffer *ab, __u32 portid)
190{
191 if (ab) {
192 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
193 nlh->nlmsg_pid = portid;
194 }
195}
196
197void audit_panic(const char *message)
198{
199 switch (audit_failure) {
200 case AUDIT_FAIL_SILENT:
201 break;
202 case AUDIT_FAIL_PRINTK:
203 if (printk_ratelimit())
204 pr_err("%s\n", message);
205 break;
206 case AUDIT_FAIL_PANIC:
207
208 if (audit_pid)
209 panic("audit: %s\n", message);
210 break;
211 }
212}
213
214static 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
243
244
245
246
247
248
249
250
251void 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) {
274 if (printk_ratelimit())
275 pr_warn("audit_lost=%u audit_rate_limit=%u audit_backlog_limit=%u\n",
276 atomic_read(&audit_lost),
277 audit_rate_limit,
278 audit_backlog_limit);
279 audit_panic(message);
280 }
281}
282
283static int audit_log_config_change(char *function_name, u32 new, u32 old,
284 int allow_changes)
285{
286 struct audit_buffer *ab;
287 int rc = 0;
288
289 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
290 if (unlikely(!ab))
291 return rc;
292 audit_log_format(ab, "%s=%u old=%u", function_name, new, old);
293 audit_log_session_info(ab);
294 rc = audit_log_task_context(ab);
295 if (rc)
296 allow_changes = 0;
297 audit_log_format(ab, " res=%d", allow_changes);
298 audit_log_end(ab);
299 return rc;
300}
301
302static int audit_do_config_change(char *function_name, u32 *to_change, u32 new)
303{
304 int allow_changes, rc = 0;
305 u32 old = *to_change;
306
307
308 if (audit_enabled == AUDIT_LOCKED)
309 allow_changes = 0;
310 else
311 allow_changes = 1;
312
313 if (audit_enabled != AUDIT_OFF) {
314 rc = audit_log_config_change(function_name, new, old, allow_changes);
315 if (rc)
316 allow_changes = 0;
317 }
318
319
320 if (allow_changes == 1)
321 *to_change = new;
322
323 else if (rc == 0)
324 rc = -EPERM;
325 return rc;
326}
327
328static int audit_set_rate_limit(u32 limit)
329{
330 return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit);
331}
332
333static int audit_set_backlog_limit(u32 limit)
334{
335 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit);
336}
337
338static int audit_set_backlog_wait_time(u32 timeout)
339{
340 return audit_do_config_change("audit_backlog_wait_time",
341 &audit_backlog_wait_time, timeout);
342}
343
344static int audit_set_enabled(u32 state)
345{
346 int rc;
347 if (state < AUDIT_OFF || state > AUDIT_LOCKED)
348 return -EINVAL;
349
350 rc = audit_do_config_change("audit_enabled", &audit_enabled, state);
351 if (!rc)
352 audit_ever_enabled |= !!state;
353
354 return rc;
355}
356
357static int audit_set_failure(u32 state)
358{
359 if (state != AUDIT_FAIL_SILENT
360 && state != AUDIT_FAIL_PRINTK
361 && state != AUDIT_FAIL_PANIC)
362 return -EINVAL;
363
364 return audit_do_config_change("audit_failure", &audit_failure, state);
365}
366
367
368
369
370
371
372
373
374
375
376static void audit_hold_skb(struct sk_buff *skb)
377{
378 if (audit_default &&
379 (!audit_backlog_limit ||
380 skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit))
381 skb_queue_tail(&audit_skb_hold_queue, skb);
382 else
383 kfree_skb(skb);
384}
385
386
387
388
389
390static void audit_printk_skb(struct sk_buff *skb)
391{
392 struct nlmsghdr *nlh = nlmsg_hdr(skb);
393 char *data = nlmsg_data(nlh);
394
395 if (nlh->nlmsg_type != AUDIT_EOE) {
396 if (printk_ratelimit())
397 pr_notice("type=%d %s\n", nlh->nlmsg_type, data);
398 else
399 audit_log_lost("printk limit exceeded");
400 }
401
402 audit_hold_skb(skb);
403}
404
405static void kauditd_send_skb(struct sk_buff *skb)
406{
407 int err;
408
409 skb_get(skb);
410 err = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
411 if (err < 0) {
412 BUG_ON(err != -ECONNREFUSED);
413 if (audit_pid) {
414 pr_err("*NO* daemon at audit_pid=%d\n", audit_pid);
415 audit_log_lost("auditd disappeared");
416 audit_pid = 0;
417 audit_sock = NULL;
418 }
419
420 audit_hold_skb(skb);
421 } else
422
423 consume_skb(skb);
424}
425
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427
428
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430
431
432
433
434
435
436
437
438
439
440
441static void flush_hold_queue(void)
442{
443 struct sk_buff *skb;
444
445 if (!audit_default || !audit_pid)
446 return;
447
448 skb = skb_dequeue(&audit_skb_hold_queue);
449 if (likely(!skb))
450 return;
451
452 while (skb && audit_pid) {
453 kauditd_send_skb(skb);
454 skb = skb_dequeue(&audit_skb_hold_queue);
455 }
456
457
458
459
460
461 if (skb)
462 consume_skb(skb);
463}
464
465static int kauditd_thread(void *dummy)
466{
467 set_freezable();
468 while (!kthread_should_stop()) {
469 struct sk_buff *skb;
470 DECLARE_WAITQUEUE(wait, current);
471
472 flush_hold_queue();
473
474 skb = skb_dequeue(&audit_skb_queue);
475
476 if (skb) {
477 if (skb_queue_len(&audit_skb_queue) <= audit_backlog_limit)
478 wake_up(&audit_backlog_wait);
479 if (audit_pid)
480 kauditd_send_skb(skb);
481 else
482 audit_printk_skb(skb);
483 continue;
484 }
485 set_current_state(TASK_INTERRUPTIBLE);
486 add_wait_queue(&kauditd_wait, &wait);
487
488 if (!skb_queue_len(&audit_skb_queue)) {
489 try_to_freeze();
490 schedule();
491 }
492
493 __set_current_state(TASK_RUNNING);
494 remove_wait_queue(&kauditd_wait, &wait);
495 }
496 return 0;
497}
498
499int audit_send_list(void *_dest)
500{
501 struct audit_netlink_list *dest = _dest;
502 struct sk_buff *skb;
503 struct net *net = dest->net;
504 struct audit_net *aunet = net_generic(net, audit_net_id);
505
506
507 mutex_lock(&audit_cmd_mutex);
508 mutex_unlock(&audit_cmd_mutex);
509
510 while ((skb = __skb_dequeue(&dest->q)) != NULL)
511 netlink_unicast(aunet->nlsk, skb, dest->portid, 0);
512
513 put_net(net);
514 kfree(dest);
515
516 return 0;
517}
518
519struct sk_buff *audit_make_reply(__u32 portid, int seq, int type, int done,
520 int multi, const void *payload, int size)
521{
522 struct sk_buff *skb;
523 struct nlmsghdr *nlh;
524 void *data;
525 int flags = multi ? NLM_F_MULTI : 0;
526 int t = done ? NLMSG_DONE : type;
527
528 skb = nlmsg_new(size, GFP_KERNEL);
529 if (!skb)
530 return NULL;
531
532 nlh = nlmsg_put(skb, portid, seq, t, size, flags);
533 if (!nlh)
534 goto out_kfree_skb;
535 data = nlmsg_data(nlh);
536 memcpy(data, payload, size);
537 return skb;
538
539out_kfree_skb:
540 kfree_skb(skb);
541 return NULL;
542}
543
544static int audit_send_reply_thread(void *arg)
545{
546 struct audit_reply *reply = (struct audit_reply *)arg;
547 struct net *net = reply->net;
548 struct audit_net *aunet = net_generic(net, audit_net_id);
549
550 mutex_lock(&audit_cmd_mutex);
551 mutex_unlock(&audit_cmd_mutex);
552
553
554
555 netlink_unicast(aunet->nlsk , reply->skb, reply->portid, 0);
556 put_net(net);
557 kfree(reply);
558 return 0;
559}
560
561
562
563
564
565
566
567
568
569
570
571
572
573static void audit_send_reply(struct sk_buff *request_skb, int seq, int type, int done,
574 int multi, const void *payload, int size)
575{
576 u32 portid = NETLINK_CB(request_skb).portid;
577 struct net *net = sock_net(NETLINK_CB(request_skb).sk);
578 struct sk_buff *skb;
579 struct task_struct *tsk;
580 struct audit_reply *reply = kmalloc(sizeof(struct audit_reply),
581 GFP_KERNEL);
582
583 if (!reply)
584 return;
585
586 skb = audit_make_reply(portid, seq, type, done, multi, payload, size);
587 if (!skb)
588 goto out;
589
590 reply->net = get_net(net);
591 reply->portid = portid;
592 reply->skb = skb;
593
594 tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
595 if (!IS_ERR(tsk))
596 return;
597 kfree_skb(skb);
598out:
599 kfree(reply);
600}
601
602
603
604
605
606static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
607{
608 int err = 0;
609
610
611
612
613
614
615
616
617
618
619
620
621 if (current_user_ns() != &init_user_ns)
622 return -ECONNREFUSED;
623
624 switch (msg_type) {
625 case AUDIT_LIST:
626 case AUDIT_ADD:
627 case AUDIT_DEL:
628 return -EOPNOTSUPP;
629 case AUDIT_GET:
630 case AUDIT_SET:
631 case AUDIT_GET_FEATURE:
632 case AUDIT_SET_FEATURE:
633 case AUDIT_LIST_RULES:
634 case AUDIT_ADD_RULE:
635 case AUDIT_DEL_RULE:
636 case AUDIT_SIGNAL_INFO:
637 case AUDIT_TTY_GET:
638 case AUDIT_TTY_SET:
639 case AUDIT_TRIM:
640 case AUDIT_MAKE_EQUIV:
641
642
643 if ((task_active_pid_ns(current) != &init_pid_ns))
644 return -EPERM;
645
646 if (!netlink_capable(skb, CAP_AUDIT_CONTROL))
647 err = -EPERM;
648 break;
649 case AUDIT_USER:
650 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
651 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
652 if (!netlink_capable(skb, CAP_AUDIT_WRITE))
653 err = -EPERM;
654 break;
655 default:
656 err = -EINVAL;
657 }
658
659 return err;
660}
661
662static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
663{
664 int rc = 0;
665 uid_t uid = from_kuid(&init_user_ns, current_uid());
666 pid_t pid = task_tgid_nr(current);
667
668 if (!audit_enabled && msg_type != AUDIT_USER_AVC) {
669 *ab = NULL;
670 return rc;
671 }
672
673 *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
674 if (unlikely(!*ab))
675 return rc;
676 audit_log_format(*ab, "pid=%d uid=%u", pid, uid);
677 audit_log_session_info(*ab);
678 audit_log_task_context(*ab);
679
680 return rc;
681}
682
683int is_audit_feature_set(int i)
684{
685 return af.features & AUDIT_FEATURE_TO_MASK(i);
686}
687
688
689static int audit_get_feature(struct sk_buff *skb)
690{
691 u32 seq;
692
693 seq = nlmsg_hdr(skb)->nlmsg_seq;
694
695 audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &af, sizeof(af));
696
697 return 0;
698}
699
700static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature,
701 u32 old_lock, u32 new_lock, int res)
702{
703 struct audit_buffer *ab;
704
705 if (audit_enabled == AUDIT_OFF)
706 return;
707
708 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE);
709 audit_log_task_info(ab, current);
710 audit_log_format(ab, "feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d",
711 audit_feature_names[which], !!old_feature, !!new_feature,
712 !!old_lock, !!new_lock, res);
713 audit_log_end(ab);
714}
715
716static int audit_set_feature(struct sk_buff *skb)
717{
718 struct audit_features *uaf;
719 int i;
720
721 BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > sizeof(audit_feature_names)/sizeof(audit_feature_names[0]));
722 uaf = nlmsg_data(nlmsg_hdr(skb));
723
724
725
726 for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
727 u32 feature = AUDIT_FEATURE_TO_MASK(i);
728 u32 old_feature, new_feature, old_lock, new_lock;
729
730
731 if (!(feature & uaf->mask))
732 continue;
733
734 old_feature = af.features & feature;
735 new_feature = uaf->features & feature;
736 new_lock = (uaf->lock | af.lock) & feature;
737 old_lock = af.lock & feature;
738
739
740 if (old_lock && (new_feature != old_feature)) {
741 audit_log_feature_change(i, old_feature, new_feature,
742 old_lock, new_lock, 0);
743 return -EPERM;
744 }
745 }
746
747 for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
748 u32 feature = AUDIT_FEATURE_TO_MASK(i);
749 u32 old_feature, new_feature, old_lock, new_lock;
750
751
752 if (!(feature & uaf->mask))
753 continue;
754
755 old_feature = af.features & feature;
756 new_feature = uaf->features & feature;
757 old_lock = af.lock & feature;
758 new_lock = (uaf->lock | af.lock) & feature;
759
760 if (new_feature != old_feature)
761 audit_log_feature_change(i, old_feature, new_feature,
762 old_lock, new_lock, 1);
763
764 if (new_feature)
765 af.features |= feature;
766 else
767 af.features &= ~feature;
768 af.lock |= new_lock;
769 }
770
771 return 0;
772}
773
774static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
775{
776 u32 seq;
777 void *data;
778 int err;
779 struct audit_buffer *ab;
780 u16 msg_type = nlh->nlmsg_type;
781 struct audit_sig_info *sig_data;
782 char *ctx = NULL;
783 u32 len;
784
785 err = audit_netlink_ok(skb, msg_type);
786 if (err)
787 return err;
788
789
790
791 if (!kauditd_task) {
792 kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
793 if (IS_ERR(kauditd_task)) {
794 err = PTR_ERR(kauditd_task);
795 kauditd_task = NULL;
796 return err;
797 }
798 }
799 seq = nlh->nlmsg_seq;
800 data = nlmsg_data(nlh);
801
802 switch (msg_type) {
803 case AUDIT_GET: {
804 struct audit_status s;
805 memset(&s, 0, sizeof(s));
806 s.enabled = audit_enabled;
807 s.failure = audit_failure;
808 s.pid = audit_pid;
809 s.rate_limit = audit_rate_limit;
810 s.backlog_limit = audit_backlog_limit;
811 s.lost = atomic_read(&audit_lost);
812 s.backlog = skb_queue_len(&audit_skb_queue);
813 s.version = AUDIT_VERSION_LATEST;
814 s.backlog_wait_time = audit_backlog_wait_time;
815 audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s));
816 break;
817 }
818 case AUDIT_SET: {
819 struct audit_status s;
820 memset(&s, 0, sizeof(s));
821
822 memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh)));
823 if (s.mask & AUDIT_STATUS_ENABLED) {
824 err = audit_set_enabled(s.enabled);
825 if (err < 0)
826 return err;
827 }
828 if (s.mask & AUDIT_STATUS_FAILURE) {
829 err = audit_set_failure(s.failure);
830 if (err < 0)
831 return err;
832 }
833 if (s.mask & AUDIT_STATUS_PID) {
834 int new_pid = s.pid;
835
836 if ((!new_pid) && (task_tgid_vnr(current) != audit_pid))
837 return -EACCES;
838 if (audit_enabled != AUDIT_OFF)
839 audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
840 audit_pid = new_pid;
841 audit_nlk_portid = NETLINK_CB(skb).portid;
842 audit_sock = skb->sk;
843 }
844 if (s.mask & AUDIT_STATUS_RATE_LIMIT) {
845 err = audit_set_rate_limit(s.rate_limit);
846 if (err < 0)
847 return err;
848 }
849 if (s.mask & AUDIT_STATUS_BACKLOG_LIMIT) {
850 err = audit_set_backlog_limit(s.backlog_limit);
851 if (err < 0)
852 return err;
853 }
854 if (s.mask & AUDIT_STATUS_BACKLOG_WAIT_TIME) {
855 if (sizeof(s) > (size_t)nlh->nlmsg_len)
856 return -EINVAL;
857 if (s.backlog_wait_time < 0 ||
858 s.backlog_wait_time > 10*AUDIT_BACKLOG_WAIT_TIME)
859 return -EINVAL;
860 err = audit_set_backlog_wait_time(s.backlog_wait_time);
861 if (err < 0)
862 return err;
863 }
864 break;
865 }
866 case AUDIT_GET_FEATURE:
867 err = audit_get_feature(skb);
868 if (err)
869 return err;
870 break;
871 case AUDIT_SET_FEATURE:
872 err = audit_set_feature(skb);
873 if (err)
874 return err;
875 break;
876 case AUDIT_USER:
877 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
878 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
879 if (!audit_enabled && msg_type != AUDIT_USER_AVC)
880 return 0;
881
882 err = audit_filter_user(msg_type);
883 if (err == 1) {
884 err = 0;
885 if (msg_type == AUDIT_USER_TTY) {
886 err = tty_audit_push_current();
887 if (err)
888 break;
889 }
890 mutex_unlock(&audit_cmd_mutex);
891 audit_log_common_recv_msg(&ab, msg_type);
892 if (msg_type != AUDIT_USER_TTY)
893 audit_log_format(ab, " msg='%.*s'",
894 AUDIT_MESSAGE_TEXT_MAX,
895 (char *)data);
896 else {
897 int size;
898
899 audit_log_format(ab, " data=");
900 size = nlmsg_len(nlh);
901 if (size > 0 &&
902 ((unsigned char *)data)[size - 1] == '\0')
903 size--;
904 audit_log_n_untrustedstring(ab, data, size);
905 }
906 audit_set_portid(ab, NETLINK_CB(skb).portid);
907 audit_log_end(ab);
908 mutex_lock(&audit_cmd_mutex);
909 }
910 break;
911 case AUDIT_ADD_RULE:
912 case AUDIT_DEL_RULE:
913 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
914 return -EINVAL;
915 if (audit_enabled == AUDIT_LOCKED) {
916 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
917 audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled);
918 audit_log_end(ab);
919 return -EPERM;
920 }
921 err = audit_rule_change(msg_type, NETLINK_CB(skb).portid,
922 seq, data, nlmsg_len(nlh));
923 break;
924 case AUDIT_LIST_RULES:
925 err = audit_list_rules_send(skb, seq);
926 break;
927 case AUDIT_TRIM:
928 audit_trim_trees();
929 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
930 audit_log_format(ab, " op=trim res=1");
931 audit_log_end(ab);
932 break;
933 case AUDIT_MAKE_EQUIV: {
934 void *bufp = data;
935 u32 sizes[2];
936 size_t msglen = nlmsg_len(nlh);
937 char *old, *new;
938
939 err = -EINVAL;
940 if (msglen < 2 * sizeof(u32))
941 break;
942 memcpy(sizes, bufp, 2 * sizeof(u32));
943 bufp += 2 * sizeof(u32);
944 msglen -= 2 * sizeof(u32);
945 old = audit_unpack_string(&bufp, &msglen, sizes[0]);
946 if (IS_ERR(old)) {
947 err = PTR_ERR(old);
948 break;
949 }
950 new = audit_unpack_string(&bufp, &msglen, sizes[1]);
951 if (IS_ERR(new)) {
952 err = PTR_ERR(new);
953 kfree(old);
954 break;
955 }
956
957 err = audit_tag_tree(old, new);
958
959 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
960
961 audit_log_format(ab, " op=make_equiv old=");
962 audit_log_untrustedstring(ab, old);
963 audit_log_format(ab, " new=");
964 audit_log_untrustedstring(ab, new);
965 audit_log_format(ab, " res=%d", !err);
966 audit_log_end(ab);
967 kfree(old);
968 kfree(new);
969 break;
970 }
971 case AUDIT_SIGNAL_INFO:
972 len = 0;
973 if (audit_sig_sid) {
974 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
975 if (err)
976 return err;
977 }
978 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
979 if (!sig_data) {
980 if (audit_sig_sid)
981 security_release_secctx(ctx, len);
982 return -ENOMEM;
983 }
984 sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
985 sig_data->pid = audit_sig_pid;
986 if (audit_sig_sid) {
987 memcpy(sig_data->ctx, ctx, len);
988 security_release_secctx(ctx, len);
989 }
990 audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
991 sig_data, sizeof(*sig_data) + len);
992 kfree(sig_data);
993 break;
994 case AUDIT_TTY_GET: {
995 struct audit_tty_status s;
996 struct task_struct *tsk = current;
997
998 spin_lock(&tsk->sighand->siglock);
999 s.enabled = tsk->signal->audit_tty;
1000 s.log_passwd = tsk->signal->audit_tty_log_passwd;
1001 spin_unlock(&tsk->sighand->siglock);
1002
1003 audit_send_reply(skb, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
1004 break;
1005 }
1006 case AUDIT_TTY_SET: {
1007 struct audit_tty_status s, old;
1008 struct task_struct *tsk = current;
1009 struct audit_buffer *ab;
1010
1011 memset(&s, 0, sizeof(s));
1012
1013 memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh)));
1014
1015 if ((s.enabled != 0 && s.enabled != 1) ||
1016 (s.log_passwd != 0 && s.log_passwd != 1))
1017 err = -EINVAL;
1018
1019 spin_lock(&tsk->sighand->siglock);
1020 old.enabled = tsk->signal->audit_tty;
1021 old.log_passwd = tsk->signal->audit_tty_log_passwd;
1022 if (!err) {
1023 tsk->signal->audit_tty = s.enabled;
1024 tsk->signal->audit_tty_log_passwd = s.log_passwd;
1025 }
1026 spin_unlock(&tsk->sighand->siglock);
1027
1028 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
1029 audit_log_format(ab, " op=tty_set old-enabled=%d new-enabled=%d"
1030 " old-log_passwd=%d new-log_passwd=%d res=%d",
1031 old.enabled, s.enabled, old.log_passwd,
1032 s.log_passwd, !err);
1033 audit_log_end(ab);
1034 break;
1035 }
1036 default:
1037 err = -EINVAL;
1038 break;
1039 }
1040
1041 return err < 0 ? err : 0;
1042}
1043
1044
1045
1046
1047
1048static void audit_receive_skb(struct sk_buff *skb)
1049{
1050 struct nlmsghdr *nlh;
1051
1052
1053
1054
1055 int len;
1056 int err;
1057
1058 nlh = nlmsg_hdr(skb);
1059 len = skb->len;
1060
1061 while (nlmsg_ok(nlh, len)) {
1062 err = audit_receive_msg(skb, nlh);
1063
1064 if (err || (nlh->nlmsg_flags & NLM_F_ACK))
1065 netlink_ack(skb, nlh, err);
1066
1067 nlh = nlmsg_next(nlh, &len);
1068 }
1069}
1070
1071
1072static void audit_receive(struct sk_buff *skb)
1073{
1074 mutex_lock(&audit_cmd_mutex);
1075 audit_receive_skb(skb);
1076 mutex_unlock(&audit_cmd_mutex);
1077}
1078
1079static int __net_init audit_net_init(struct net *net)
1080{
1081 struct netlink_kernel_cfg cfg = {
1082 .input = audit_receive,
1083 };
1084
1085 struct audit_net *aunet = net_generic(net, audit_net_id);
1086
1087 aunet->nlsk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg);
1088 if (aunet->nlsk == NULL) {
1089 audit_panic("cannot initialize netlink socket in namespace");
1090 return -ENOMEM;
1091 }
1092 aunet->nlsk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
1093 return 0;
1094}
1095
1096static void __net_exit audit_net_exit(struct net *net)
1097{
1098 struct audit_net *aunet = net_generic(net, audit_net_id);
1099 struct sock *sock = aunet->nlsk;
1100 if (sock == audit_sock) {
1101 audit_pid = 0;
1102 audit_sock = NULL;
1103 }
1104
1105 RCU_INIT_POINTER(aunet->nlsk, NULL);
1106 synchronize_net();
1107 netlink_kernel_release(sock);
1108}
1109
1110static struct pernet_operations audit_net_ops __net_initdata = {
1111 .init = audit_net_init,
1112 .exit = audit_net_exit,
1113 .id = &audit_net_id,
1114 .size = sizeof(struct audit_net),
1115};
1116
1117
1118static int __init audit_init(void)
1119{
1120 int i;
1121
1122 if (audit_initialized == AUDIT_DISABLED)
1123 return 0;
1124
1125 pr_info("initializing netlink subsys (%s)\n",
1126 audit_default ? "enabled" : "disabled");
1127 register_pernet_subsys(&audit_net_ops);
1128
1129 skb_queue_head_init(&audit_skb_queue);
1130 skb_queue_head_init(&audit_skb_hold_queue);
1131 audit_initialized = AUDIT_INITIALIZED;
1132 audit_enabled = audit_default;
1133 audit_ever_enabled |= !!audit_default;
1134
1135 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
1136
1137 for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
1138 INIT_LIST_HEAD(&audit_inode_hash[i]);
1139
1140 return 0;
1141}
1142__initcall(audit_init);
1143
1144
1145static int __init audit_enable(char *str)
1146{
1147 audit_default = !!simple_strtol(str, NULL, 0);
1148 if (!audit_default)
1149 audit_initialized = AUDIT_DISABLED;
1150
1151 pr_info("%s\n", audit_default ?
1152 "enabled (after initialization)" : "disabled (until reboot)");
1153
1154 return 1;
1155}
1156__setup("audit=", audit_enable);
1157
1158
1159
1160static int __init audit_backlog_limit_set(char *str)
1161{
1162 u32 audit_backlog_limit_arg;
1163
1164 pr_info("audit_backlog_limit: ");
1165 if (kstrtouint(str, 0, &audit_backlog_limit_arg)) {
1166 pr_cont("using default of %u, unable to parse %s\n",
1167 audit_backlog_limit, str);
1168 return 1;
1169 }
1170
1171 audit_backlog_limit = audit_backlog_limit_arg;
1172 pr_cont("%d\n", audit_backlog_limit);
1173
1174 return 1;
1175}
1176__setup("audit_backlog_limit=", audit_backlog_limit_set);
1177
1178static void audit_buffer_free(struct audit_buffer *ab)
1179{
1180 unsigned long flags;
1181
1182 if (!ab)
1183 return;
1184
1185 if (ab->skb)
1186 kfree_skb(ab->skb);
1187
1188 spin_lock_irqsave(&audit_freelist_lock, flags);
1189 if (audit_freelist_count > AUDIT_MAXFREE)
1190 kfree(ab);
1191 else {
1192 audit_freelist_count++;
1193 list_add(&ab->list, &audit_freelist);
1194 }
1195 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1196}
1197
1198static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
1199 gfp_t gfp_mask, int type)
1200{
1201 unsigned long flags;
1202 struct audit_buffer *ab = NULL;
1203 struct nlmsghdr *nlh;
1204
1205 spin_lock_irqsave(&audit_freelist_lock, flags);
1206 if (!list_empty(&audit_freelist)) {
1207 ab = list_entry(audit_freelist.next,
1208 struct audit_buffer, list);
1209 list_del(&ab->list);
1210 --audit_freelist_count;
1211 }
1212 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1213
1214 if (!ab) {
1215 ab = kmalloc(sizeof(*ab), gfp_mask);
1216 if (!ab)
1217 goto err;
1218 }
1219
1220 ab->ctx = ctx;
1221 ab->gfp_mask = gfp_mask;
1222
1223 ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
1224 if (!ab->skb)
1225 goto err;
1226
1227 nlh = nlmsg_put(ab->skb, 0, 0, type, 0, 0);
1228 if (!nlh)
1229 goto out_kfree_skb;
1230
1231 return ab;
1232
1233out_kfree_skb:
1234 kfree_skb(ab->skb);
1235 ab->skb = NULL;
1236err:
1237 audit_buffer_free(ab);
1238 return NULL;
1239}
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258unsigned int audit_serial(void)
1259{
1260 static DEFINE_SPINLOCK(serial_lock);
1261 static unsigned int serial = 0;
1262
1263 unsigned long flags;
1264 unsigned int ret;
1265
1266 spin_lock_irqsave(&serial_lock, flags);
1267 do {
1268 ret = ++serial;
1269 } while (unlikely(!ret));
1270 spin_unlock_irqrestore(&serial_lock, flags);
1271
1272 return ret;
1273}
1274
1275static inline void audit_get_stamp(struct audit_context *ctx,
1276 struct timespec *t, unsigned int *serial)
1277{
1278 if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
1279 *t = CURRENT_TIME;
1280 *serial = audit_serial();
1281 }
1282}
1283
1284
1285
1286
1287static long wait_for_auditd(long sleep_time)
1288{
1289 DECLARE_WAITQUEUE(wait, current);
1290 set_current_state(TASK_UNINTERRUPTIBLE);
1291 add_wait_queue_exclusive(&audit_backlog_wait, &wait);
1292
1293 if (audit_backlog_limit &&
1294 skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
1295 sleep_time = schedule_timeout(sleep_time);
1296
1297 __set_current_state(TASK_RUNNING);
1298 remove_wait_queue(&audit_backlog_wait, &wait);
1299
1300 return sleep_time;
1301}
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
1319 int type)
1320{
1321 struct audit_buffer *ab = NULL;
1322 struct timespec t;
1323 unsigned int uninitialized_var(serial);
1324 int reserve = 5;
1325
1326 unsigned long timeout_start = jiffies;
1327
1328 if (audit_initialized != AUDIT_INITIALIZED)
1329 return NULL;
1330
1331 if (unlikely(audit_filter_type(type)))
1332 return NULL;
1333
1334 if (gfp_mask & __GFP_WAIT) {
1335 if (audit_pid && audit_pid == current->pid)
1336 gfp_mask &= ~__GFP_WAIT;
1337 else
1338 reserve = 0;
1339 }
1340
1341 while (audit_backlog_limit
1342 && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
1343 if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) {
1344 long sleep_time;
1345
1346 sleep_time = timeout_start + audit_backlog_wait_time - jiffies;
1347 if (sleep_time > 0) {
1348 sleep_time = wait_for_auditd(sleep_time);
1349 if (sleep_time > 0)
1350 continue;
1351 }
1352 }
1353 if (audit_rate_check() && printk_ratelimit())
1354 pr_warn("audit_backlog=%d > audit_backlog_limit=%d\n",
1355 skb_queue_len(&audit_skb_queue),
1356 audit_backlog_limit);
1357 audit_log_lost("backlog limit exceeded");
1358 audit_backlog_wait_time = audit_backlog_wait_overflow;
1359 wake_up(&audit_backlog_wait);
1360 return NULL;
1361 }
1362
1363 audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
1364
1365 ab = audit_buffer_alloc(ctx, gfp_mask, type);
1366 if (!ab) {
1367 audit_log_lost("out of memory in audit_log_start");
1368 return NULL;
1369 }
1370
1371 audit_get_stamp(ab->ctx, &t, &serial);
1372
1373 audit_log_format(ab, "audit(%lu.%03lu:%u): ",
1374 t.tv_sec, t.tv_nsec/1000000, serial);
1375 return ab;
1376}
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386static inline int audit_expand(struct audit_buffer *ab, int extra)
1387{
1388 struct sk_buff *skb = ab->skb;
1389 int oldtail = skb_tailroom(skb);
1390 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
1391 int newtail = skb_tailroom(skb);
1392
1393 if (ret < 0) {
1394 audit_log_lost("out of memory in audit_expand");
1395 return 0;
1396 }
1397
1398 skb->truesize += newtail - oldtail;
1399 return newtail;
1400}
1401
1402
1403
1404
1405
1406
1407
1408static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
1409 va_list args)
1410{
1411 int len, avail;
1412 struct sk_buff *skb;
1413 va_list args2;
1414
1415 if (!ab)
1416 return;
1417
1418 BUG_ON(!ab->skb);
1419 skb = ab->skb;
1420 avail = skb_tailroom(skb);
1421 if (avail == 0) {
1422 avail = audit_expand(ab, AUDIT_BUFSIZ);
1423 if (!avail)
1424 goto out;
1425 }
1426 va_copy(args2, args);
1427 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
1428 if (len >= avail) {
1429
1430
1431
1432 avail = audit_expand(ab,
1433 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
1434 if (!avail)
1435 goto out_va_end;
1436 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
1437 }
1438 if (len > 0)
1439 skb_put(skb, len);
1440out_va_end:
1441 va_end(args2);
1442out:
1443 return;
1444}
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
1455{
1456 va_list args;
1457
1458 if (!ab)
1459 return;
1460 va_start(args, fmt);
1461 audit_log_vformat(ab, fmt, args);
1462 va_end(args);
1463}
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
1477 size_t len)
1478{
1479 int i, avail, new_len;
1480 unsigned char *ptr;
1481 struct sk_buff *skb;
1482
1483 if (!ab)
1484 return;
1485
1486 BUG_ON(!ab->skb);
1487 skb = ab->skb;
1488 avail = skb_tailroom(skb);
1489 new_len = len<<1;
1490 if (new_len >= avail) {
1491
1492 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
1493 avail = audit_expand(ab, new_len);
1494 if (!avail)
1495 return;
1496 }
1497
1498 ptr = skb_tail_pointer(skb);
1499 for (i = 0; i < len; i++)
1500 ptr = hex_byte_pack_upper(ptr, buf[i]);
1501 *ptr = 0;
1502 skb_put(skb, len << 1);
1503}
1504
1505
1506
1507
1508
1509void audit_log_n_string(struct audit_buffer *ab, const char *string,
1510 size_t slen)
1511{
1512 int avail, new_len;
1513 unsigned char *ptr;
1514 struct sk_buff *skb;
1515
1516 if (!ab)
1517 return;
1518
1519 BUG_ON(!ab->skb);
1520 skb = ab->skb;
1521 avail = skb_tailroom(skb);
1522 new_len = slen + 3;
1523 if (new_len > avail) {
1524 avail = audit_expand(ab, new_len);
1525 if (!avail)
1526 return;
1527 }
1528 ptr = skb_tail_pointer(skb);
1529 *ptr++ = '"';
1530 memcpy(ptr, string, slen);
1531 ptr += slen;
1532 *ptr++ = '"';
1533 *ptr = 0;
1534 skb_put(skb, slen + 2);
1535}
1536
1537
1538
1539
1540
1541
1542int audit_string_contains_control(const char *string, size_t len)
1543{
1544 const unsigned char *p;
1545 for (p = string; p < (const unsigned char *)string + len; p++) {
1546 if (*p == '"' || *p < 0x21 || *p > 0x7e)
1547 return 1;
1548 }
1549 return 0;
1550}
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
1567 size_t len)
1568{
1569 if (audit_string_contains_control(string, len))
1570 audit_log_n_hex(ab, string, len);
1571 else
1572 audit_log_n_string(ab, string, len);
1573}
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
1584{
1585 audit_log_n_untrustedstring(ab, string, strlen(string));
1586}
1587
1588
1589void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
1590 const struct path *path)
1591{
1592 char *p, *pathname;
1593
1594 if (prefix)
1595 audit_log_format(ab, "%s", prefix);
1596
1597
1598 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
1599 if (!pathname) {
1600 audit_log_string(ab, "<no_memory>");
1601 return;
1602 }
1603 p = d_path(path, pathname, PATH_MAX+11);
1604 if (IS_ERR(p)) {
1605
1606 audit_log_string(ab, "<too_long>");
1607 } else
1608 audit_log_untrustedstring(ab, p);
1609 kfree(pathname);
1610}
1611
1612void audit_log_session_info(struct audit_buffer *ab)
1613{
1614 unsigned int sessionid = audit_get_sessionid(current);
1615 uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current));
1616
1617 audit_log_format(ab, " auid=%u ses=%u", auid, sessionid);
1618}
1619
1620void audit_log_key(struct audit_buffer *ab, char *key)
1621{
1622 audit_log_format(ab, " key=");
1623 if (key)
1624 audit_log_untrustedstring(ab, key);
1625 else
1626 audit_log_format(ab, "(null)");
1627}
1628
1629void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
1630{
1631 int i;
1632
1633 audit_log_format(ab, " %s=", prefix);
1634 CAP_FOR_EACH_U32(i) {
1635 audit_log_format(ab, "%08x",
1636 cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]);
1637 }
1638}
1639
1640void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
1641{
1642 kernel_cap_t *perm = &name->fcap.permitted;
1643 kernel_cap_t *inh = &name->fcap.inheritable;
1644 int log = 0;
1645
1646 if (!cap_isclear(*perm)) {
1647 audit_log_cap(ab, "cap_fp", perm);
1648 log = 1;
1649 }
1650 if (!cap_isclear(*inh)) {
1651 audit_log_cap(ab, "cap_fi", inh);
1652 log = 1;
1653 }
1654
1655 if (log)
1656 audit_log_format(ab, " cap_fe=%d cap_fver=%x",
1657 name->fcap.fE, name->fcap_ver);
1658}
1659
1660static inline int audit_copy_fcaps(struct audit_names *name,
1661 const struct dentry *dentry)
1662{
1663 struct cpu_vfs_cap_data caps;
1664 int rc;
1665
1666 if (!dentry)
1667 return 0;
1668
1669 rc = get_vfs_caps_from_disk(dentry, &caps);
1670 if (rc)
1671 return rc;
1672
1673 name->fcap.permitted = caps.permitted;
1674 name->fcap.inheritable = caps.inheritable;
1675 name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
1676 name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >>
1677 VFS_CAP_REVISION_SHIFT;
1678
1679 return 0;
1680}
1681
1682
1683void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
1684 const struct inode *inode)
1685{
1686 name->ino = inode->i_ino;
1687 name->dev = inode->i_sb->s_dev;
1688 name->mode = inode->i_mode;
1689 name->uid = inode->i_uid;
1690 name->gid = inode->i_gid;
1691 name->rdev = inode->i_rdev;
1692 security_inode_getsecid(inode, &name->osid);
1693 audit_copy_fcaps(name, dentry);
1694}
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704void audit_log_name(struct audit_context *context, struct audit_names *n,
1705 struct path *path, int record_num, int *call_panic)
1706{
1707 struct audit_buffer *ab;
1708 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
1709 if (!ab)
1710 return;
1711
1712 audit_log_format(ab, "item=%d", record_num);
1713
1714 if (path)
1715 audit_log_d_path(ab, " name=", path);
1716 else if (n->name) {
1717 switch (n->name_len) {
1718 case AUDIT_NAME_FULL:
1719
1720 audit_log_format(ab, " name=");
1721 audit_log_untrustedstring(ab, n->name->name);
1722 break;
1723 case 0:
1724
1725
1726 audit_log_d_path(ab, " name=", &context->pwd);
1727 break;
1728 default:
1729
1730 audit_log_format(ab, " name=");
1731 audit_log_n_untrustedstring(ab, n->name->name,
1732 n->name_len);
1733 }
1734 } else
1735 audit_log_format(ab, " name=(null)");
1736
1737 if (n->ino != (unsigned long)-1) {
1738 audit_log_format(ab, " inode=%lu"
1739 " dev=%02x:%02x mode=%#ho"
1740 " ouid=%u ogid=%u rdev=%02x:%02x",
1741 n->ino,
1742 MAJOR(n->dev),
1743 MINOR(n->dev),
1744 n->mode,
1745 from_kuid(&init_user_ns, n->uid),
1746 from_kgid(&init_user_ns, n->gid),
1747 MAJOR(n->rdev),
1748 MINOR(n->rdev));
1749 }
1750 if (n->osid != 0) {
1751 char *ctx = NULL;
1752 u32 len;
1753 if (security_secid_to_secctx(
1754 n->osid, &ctx, &len)) {
1755 audit_log_format(ab, " osid=%u", n->osid);
1756 if (call_panic)
1757 *call_panic = 2;
1758 } else {
1759 audit_log_format(ab, " obj=%s", ctx);
1760 security_release_secctx(ctx, len);
1761 }
1762 }
1763
1764
1765 audit_log_format(ab, " nametype=");
1766 switch(n->type) {
1767 case AUDIT_TYPE_NORMAL:
1768 audit_log_format(ab, "NORMAL");
1769 break;
1770 case AUDIT_TYPE_PARENT:
1771 audit_log_format(ab, "PARENT");
1772 break;
1773 case AUDIT_TYPE_CHILD_DELETE:
1774 audit_log_format(ab, "DELETE");
1775 break;
1776 case AUDIT_TYPE_CHILD_CREATE:
1777 audit_log_format(ab, "CREATE");
1778 break;
1779 default:
1780 audit_log_format(ab, "UNKNOWN");
1781 break;
1782 }
1783
1784 audit_log_fcaps(ab, n);
1785 audit_log_end(ab);
1786}
1787
1788int audit_log_task_context(struct audit_buffer *ab)
1789{
1790 char *ctx = NULL;
1791 unsigned len;
1792 int error;
1793 u32 sid;
1794
1795 security_task_getsecid(current, &sid);
1796 if (!sid)
1797 return 0;
1798
1799 error = security_secid_to_secctx(sid, &ctx, &len);
1800 if (error) {
1801 if (error != -EINVAL)
1802 goto error_path;
1803 return 0;
1804 }
1805
1806 audit_log_format(ab, " subj=%s", ctx);
1807 security_release_secctx(ctx, len);
1808 return 0;
1809
1810error_path:
1811 audit_panic("error in audit_log_task_context");
1812 return error;
1813}
1814EXPORT_SYMBOL(audit_log_task_context);
1815
1816void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
1817{
1818 const struct cred *cred;
1819 char name[sizeof(tsk->comm)];
1820 struct mm_struct *mm = tsk->mm;
1821 char *tty;
1822
1823 if (!ab)
1824 return;
1825
1826
1827 cred = current_cred();
1828
1829 spin_lock_irq(&tsk->sighand->siglock);
1830 if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name)
1831 tty = tsk->signal->tty->name;
1832 else
1833 tty = "(none)";
1834 spin_unlock_irq(&tsk->sighand->siglock);
1835
1836 audit_log_format(ab,
1837 " ppid=%d pid=%d auid=%u uid=%u gid=%u"
1838 " euid=%u suid=%u fsuid=%u"
1839 " egid=%u sgid=%u fsgid=%u tty=%s ses=%u",
1840 task_ppid_nr(tsk),
1841 task_pid_nr(tsk),
1842 from_kuid(&init_user_ns, audit_get_loginuid(tsk)),
1843 from_kuid(&init_user_ns, cred->uid),
1844 from_kgid(&init_user_ns, cred->gid),
1845 from_kuid(&init_user_ns, cred->euid),
1846 from_kuid(&init_user_ns, cred->suid),
1847 from_kuid(&init_user_ns, cred->fsuid),
1848 from_kgid(&init_user_ns, cred->egid),
1849 from_kgid(&init_user_ns, cred->sgid),
1850 from_kgid(&init_user_ns, cred->fsgid),
1851 tty, audit_get_sessionid(tsk));
1852
1853 get_task_comm(name, tsk);
1854 audit_log_format(ab, " comm=");
1855 audit_log_untrustedstring(ab, name);
1856
1857 if (mm) {
1858 down_read(&mm->mmap_sem);
1859 if (mm->exe_file)
1860 audit_log_d_path(ab, " exe=", &mm->exe_file->f_path);
1861 up_read(&mm->mmap_sem);
1862 } else
1863 audit_log_format(ab, " exe=(null)");
1864 audit_log_task_context(ab);
1865}
1866EXPORT_SYMBOL(audit_log_task_info);
1867
1868
1869
1870
1871
1872
1873void audit_log_link_denied(const char *operation, struct path *link)
1874{
1875 struct audit_buffer *ab;
1876 struct audit_names *name;
1877
1878 name = kzalloc(sizeof(*name), GFP_NOFS);
1879 if (!name)
1880 return;
1881
1882
1883 ab = audit_log_start(current->audit_context, GFP_KERNEL,
1884 AUDIT_ANOM_LINK);
1885 if (!ab)
1886 goto out;
1887 audit_log_format(ab, "op=%s", operation);
1888 audit_log_task_info(ab, current);
1889 audit_log_format(ab, " res=0");
1890 audit_log_end(ab);
1891
1892
1893 name->type = AUDIT_TYPE_NORMAL;
1894 audit_copy_inode(name, link->dentry, link->dentry->d_inode);
1895 audit_log_name(current->audit_context, name, link, 0, NULL);
1896out:
1897 kfree(name);
1898}
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909void audit_log_end(struct audit_buffer *ab)
1910{
1911 if (!ab)
1912 return;
1913 if (!audit_rate_check()) {
1914 audit_log_lost("rate limit exceeded");
1915 } else {
1916 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
1917 nlh->nlmsg_len = ab->skb->len - NLMSG_HDRLEN;
1918
1919 if (audit_pid) {
1920 skb_queue_tail(&audit_skb_queue, ab->skb);
1921 wake_up_interruptible(&kauditd_wait);
1922 } else {
1923 audit_printk_skb(ab->skb);
1924 }
1925 ab->skb = NULL;
1926 }
1927 audit_buffer_free(ab);
1928}
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
1943 const char *fmt, ...)
1944{
1945 struct audit_buffer *ab;
1946 va_list args;
1947
1948 ab = audit_log_start(ctx, gfp_mask, type);
1949 if (ab) {
1950 va_start(args, fmt);
1951 audit_log_vformat(ab, fmt, args);
1952 va_end(args);
1953 audit_log_end(ab);
1954 }
1955}
1956
1957#ifdef CONFIG_SECURITY
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968void audit_log_secctx(struct audit_buffer *ab, u32 secid)
1969{
1970 u32 len;
1971 char *secctx;
1972
1973 if (security_secid_to_secctx(secid, &secctx, &len)) {
1974 audit_panic("Cannot convert secid to context");
1975 } else {
1976 audit_log_format(ab, " obj=%s", secctx);
1977 security_release_secctx(secctx, len);
1978 }
1979}
1980EXPORT_SYMBOL(audit_log_secctx);
1981#endif
1982
1983EXPORT_SYMBOL(audit_log_start);
1984EXPORT_SYMBOL(audit_log_end);
1985EXPORT_SYMBOL(audit_log_format);
1986EXPORT_SYMBOL(audit_log);
1987