1 /* audit.c -- Auditing support
2 * Gateway between the kernel (e.g., selinux) and the user-space audit daemon.
3 * System-call specific features have moved to auditsc.c
5 * Copyright 2003-2007 Red Hat Inc., Durham, North Carolina.
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.
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.
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
22 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
24 * Goals: 1) Integrate fully with Security Modules.
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
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
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.
41 * Example user-space utilities: http://people.redhat.com/sgrubb/audit/
44 #include <linux/init.h>
45 #include <asm/types.h>
46 #include <linux/atomic.h>
48 #include <linux/export.h>
49 #include <linux/slab.h>
50 #include <linux/err.h>
51 #include <linux/kthread.h>
52 #include <linux/kernel.h>
53 #include <linux/syscalls.h>
55 #include <linux/audit.h>
58 #include <net/netlink.h>
59 #include <linux/skbuff.h>
60 #ifdef CONFIG_SECURITY
61 #include <linux/security.h>
63 #include <linux/freezer.h>
64 #include <linux/tty.h>
65 #include <linux/pid_namespace.h>
66 #include <net/netns/generic.h>
70 /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
71 * (Initialization happens after skb_init is called.) */
72 #define AUDIT_DISABLED -1
73 #define AUDIT_UNINITIALIZED 0
74 #define AUDIT_INITIALIZED 1
75 static int audit_initialized
;
79 #define AUDIT_LOCKED 2
81 int audit_ever_enabled
;
83 EXPORT_SYMBOL_GPL(audit_enabled
);
85 /* Default state when kernel boots without any parameters. */
86 static int audit_default
;
88 /* If auditing cannot proceed, audit_failure selects what happens. */
89 static int audit_failure
= AUDIT_FAIL_PRINTK
;
92 * If audit records are to be written to the netlink socket, audit_pid
93 * contains the pid of the auditd process and audit_nlk_portid contains
94 * the portid to use to send netlink messages to that process.
97 static __u32 audit_nlk_portid
;
99 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
100 * to that number per second. This prevents DoS attacks, but results in
101 * audit records being dropped. */
102 static int audit_rate_limit
;
104 /* Number of outstanding audit_buffers allowed. */
105 static int audit_backlog_limit
= 64;
106 static int audit_backlog_wait_time
= 60 * HZ
;
107 static int audit_backlog_wait_overflow
= 0;
109 /* The identity of the user shutting down the audit system. */
110 kuid_t audit_sig_uid
= INVALID_UID
;
111 pid_t audit_sig_pid
= -1;
112 u32 audit_sig_sid
= 0;
114 /* Records can be lost in several ways:
115 0) [suppressed in audit_alloc]
116 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
117 2) out of memory in audit_log_move [alloc_skb]
118 3) suppressed due to audit_rate_limit
119 4) suppressed due to audit_backlog_limit
121 static atomic_t audit_lost
= ATOMIC_INIT(0);
123 /* The netlink socket. */
124 static struct sock
*audit_sock
;
127 /* Hash for inode-based rules */
128 struct list_head audit_inode_hash
[AUDIT_INODE_BUCKETS
];
130 /* The audit_freelist is a list of pre-allocated audit buffers (if more
131 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
132 * being placed on the freelist). */
133 static DEFINE_SPINLOCK(audit_freelist_lock
);
134 static int audit_freelist_count
;
135 static LIST_HEAD(audit_freelist
);
137 static struct sk_buff_head audit_skb_queue
;
138 /* queue of skbs to send to auditd when/if it comes back */
139 static struct sk_buff_head audit_skb_hold_queue
;
140 static struct task_struct
*kauditd_task
;
141 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait
);
142 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait
);
144 static struct audit_features af
= {.vers
= AUDIT_FEATURE_VERSION
,
149 static char *audit_feature_names
[2] = {
150 "only_unset_loginuid",
151 "loginuid_immutable",
155 /* Serialize requests from userspace. */
156 DEFINE_MUTEX(audit_cmd_mutex
);
158 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
159 * audit records. Since printk uses a 1024 byte buffer, this buffer
160 * should be at least that large. */
161 #define AUDIT_BUFSIZ 1024
163 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
164 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
165 #define AUDIT_MAXFREE (2*NR_CPUS)
167 /* The audit_buffer is used when formatting an audit record. The caller
168 * locks briefly to get the record off the freelist or to allocate the
169 * buffer, and locks briefly to send the buffer to the netlink layer or
170 * to place it on a transmit queue. Multiple audit_buffers can be in
171 * use simultaneously. */
172 struct audit_buffer
{
173 struct list_head list
;
174 struct sk_buff
*skb
; /* formatted skb ready to send */
175 struct audit_context
*ctx
; /* NULL or associated context */
185 static void audit_set_portid(struct audit_buffer
*ab
, __u32 portid
)
188 struct nlmsghdr
*nlh
= nlmsg_hdr(ab
->skb
);
189 nlh
->nlmsg_pid
= portid
;
193 void audit_panic(const char *message
)
195 switch (audit_failure
)
197 case AUDIT_FAIL_SILENT
:
199 case AUDIT_FAIL_PRINTK
:
200 if (printk_ratelimit())
201 printk(KERN_ERR
"audit: %s\n", message
);
203 case AUDIT_FAIL_PANIC
:
204 /* test audit_pid since printk is always losey, why bother? */
206 panic("audit: %s\n", message
);
211 static inline int audit_rate_check(void)
213 static unsigned long last_check
= 0;
214 static int messages
= 0;
215 static DEFINE_SPINLOCK(lock
);
218 unsigned long elapsed
;
221 if (!audit_rate_limit
) return 1;
223 spin_lock_irqsave(&lock
, flags
);
224 if (++messages
< audit_rate_limit
) {
228 elapsed
= now
- last_check
;
235 spin_unlock_irqrestore(&lock
, flags
);
241 * audit_log_lost - conditionally log lost audit message event
242 * @message: the message stating reason for lost audit message
244 * Emit at least 1 message per second, even if audit_rate_check is
246 * Always increment the lost messages counter.
248 void audit_log_lost(const char *message
)
250 static unsigned long last_msg
= 0;
251 static DEFINE_SPINLOCK(lock
);
256 atomic_inc(&audit_lost
);
258 print
= (audit_failure
== AUDIT_FAIL_PANIC
|| !audit_rate_limit
);
261 spin_lock_irqsave(&lock
, flags
);
263 if (now
- last_msg
> HZ
) {
267 spin_unlock_irqrestore(&lock
, flags
);
271 if (printk_ratelimit())
273 "audit: audit_lost=%d audit_rate_limit=%d "
274 "audit_backlog_limit=%d\n",
275 atomic_read(&audit_lost
),
277 audit_backlog_limit
);
278 audit_panic(message
);
282 static int audit_log_config_change(char *function_name
, int new, int old
,
285 struct audit_buffer
*ab
;
288 ab
= audit_log_start(NULL
, GFP_KERNEL
, AUDIT_CONFIG_CHANGE
);
291 audit_log_format(ab
, "%s=%d old=%d", function_name
, new, old
);
292 audit_log_session_info(ab
);
293 rc
= audit_log_task_context(ab
);
295 allow_changes
= 0; /* Something weird, deny request */
296 audit_log_format(ab
, " res=%d", allow_changes
);
301 static int audit_do_config_change(char *function_name
, int *to_change
, int new)
303 int allow_changes
, rc
= 0, old
= *to_change
;
305 /* check if we are locked */
306 if (audit_enabled
== AUDIT_LOCKED
)
311 if (audit_enabled
!= AUDIT_OFF
) {
312 rc
= audit_log_config_change(function_name
, new, old
, allow_changes
);
317 /* If we are allowed, make the change */
318 if (allow_changes
== 1)
320 /* Not allowed, update reason */
326 static int audit_set_rate_limit(int limit
)
328 return audit_do_config_change("audit_rate_limit", &audit_rate_limit
, limit
);
331 static int audit_set_backlog_limit(int limit
)
333 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit
, limit
);
336 static int audit_set_enabled(int state
)
339 if (state
< AUDIT_OFF
|| state
> AUDIT_LOCKED
)
342 rc
= audit_do_config_change("audit_enabled", &audit_enabled
, state
);
344 audit_ever_enabled
|= !!state
;
349 static int audit_set_failure(int state
)
351 if (state
!= AUDIT_FAIL_SILENT
352 && state
!= AUDIT_FAIL_PRINTK
353 && state
!= AUDIT_FAIL_PANIC
)
356 return audit_do_config_change("audit_failure", &audit_failure
, state
);
360 * Queue skbs to be sent to auditd when/if it comes back. These skbs should
361 * already have been sent via prink/syslog and so if these messages are dropped
362 * it is not a huge concern since we already passed the audit_log_lost()
363 * notification and stuff. This is just nice to get audit messages during
364 * boot before auditd is running or messages generated while auditd is stopped.
365 * This only holds messages is audit_default is set, aka booting with audit=1
366 * or building your kernel that way.
368 static void audit_hold_skb(struct sk_buff
*skb
)
371 skb_queue_len(&audit_skb_hold_queue
) < audit_backlog_limit
)
372 skb_queue_tail(&audit_skb_hold_queue
, skb
);
378 * For one reason or another this nlh isn't getting delivered to the userspace
379 * audit daemon, just send it to printk.
381 static void audit_printk_skb(struct sk_buff
*skb
)
383 struct nlmsghdr
*nlh
= nlmsg_hdr(skb
);
384 char *data
= nlmsg_data(nlh
);
386 if (nlh
->nlmsg_type
!= AUDIT_EOE
) {
387 if (printk_ratelimit())
388 printk(KERN_NOTICE
"type=%d %s\n", nlh
->nlmsg_type
, data
);
390 audit_log_lost("printk limit exceeded\n");
396 static void kauditd_send_skb(struct sk_buff
*skb
)
399 /* take a reference in case we can't send it and we want to hold it */
401 err
= netlink_unicast(audit_sock
, skb
, audit_nlk_portid
, 0);
403 BUG_ON(err
!= -ECONNREFUSED
); /* Shouldn't happen */
404 printk(KERN_ERR
"audit: *NO* daemon at audit_pid=%d\n", audit_pid
);
405 audit_log_lost("auditd disappeared\n");
408 /* we might get lucky and get this in the next auditd */
411 /* drop the extra reference if sent ok */
416 * flush_hold_queue - empty the hold queue if auditd appears
418 * If auditd just started, drain the queue of messages already
419 * sent to syslog/printk. Remember loss here is ok. We already
420 * called audit_log_lost() if it didn't go out normally. so the
421 * race between the skb_dequeue and the next check for audit_pid
424 * If you ever find kauditd to be too slow we can get a perf win
425 * by doing our own locking and keeping better track if there
426 * are messages in this queue. I don't see the need now, but
427 * in 5 years when I want to play with this again I'll see this
428 * note and still have no friggin idea what i'm thinking today.
430 static void flush_hold_queue(void)
434 if (!audit_default
|| !audit_pid
)
437 skb
= skb_dequeue(&audit_skb_hold_queue
);
441 while (skb
&& audit_pid
) {
442 kauditd_send_skb(skb
);
443 skb
= skb_dequeue(&audit_skb_hold_queue
);
447 * if auditd just disappeared but we
448 * dequeued an skb we need to drop ref
454 static int kauditd_thread(void *dummy
)
457 while (!kthread_should_stop()) {
459 DECLARE_WAITQUEUE(wait
, current
);
463 skb
= skb_dequeue(&audit_skb_queue
);
464 wake_up(&audit_backlog_wait
);
467 kauditd_send_skb(skb
);
469 audit_printk_skb(skb
);
472 set_current_state(TASK_INTERRUPTIBLE
);
473 add_wait_queue(&kauditd_wait
, &wait
);
475 if (!skb_queue_len(&audit_skb_queue
)) {
480 __set_current_state(TASK_RUNNING
);
481 remove_wait_queue(&kauditd_wait
, &wait
);
486 int audit_send_list(void *_dest
)
488 struct audit_netlink_list
*dest
= _dest
;
490 struct net
*net
= get_net_ns_by_pid(dest
->pid
);
491 struct audit_net
*aunet
= net_generic(net
, audit_net_id
);
493 /* wait for parent to finish and send an ACK */
494 mutex_lock(&audit_cmd_mutex
);
495 mutex_unlock(&audit_cmd_mutex
);
497 while ((skb
= __skb_dequeue(&dest
->q
)) != NULL
)
498 netlink_unicast(aunet
->nlsk
, skb
, dest
->portid
, 0);
505 struct sk_buff
*audit_make_reply(__u32 portid
, int seq
, int type
, int done
,
506 int multi
, const void *payload
, int size
)
509 struct nlmsghdr
*nlh
;
511 int flags
= multi
? NLM_F_MULTI
: 0;
512 int t
= done
? NLMSG_DONE
: type
;
514 skb
= nlmsg_new(size
, GFP_KERNEL
);
518 nlh
= nlmsg_put(skb
, portid
, seq
, t
, size
, flags
);
521 data
= nlmsg_data(nlh
);
522 memcpy(data
, payload
, size
);
530 static int audit_send_reply_thread(void *arg
)
532 struct audit_reply
*reply
= (struct audit_reply
*)arg
;
533 struct net
*net
= get_net_ns_by_pid(reply
->pid
);
534 struct audit_net
*aunet
= net_generic(net
, audit_net_id
);
536 mutex_lock(&audit_cmd_mutex
);
537 mutex_unlock(&audit_cmd_mutex
);
539 /* Ignore failure. It'll only happen if the sender goes away,
540 because our timeout is set to infinite. */
541 netlink_unicast(aunet
->nlsk
, reply
->skb
, reply
->portid
, 0);
546 * audit_send_reply - send an audit reply message via netlink
547 * @portid: netlink port to which to send reply
548 * @seq: sequence number
549 * @type: audit message type
550 * @done: done (last) flag
551 * @multi: multi-part message flag
552 * @payload: payload data
553 * @size: payload size
555 * Allocates an skb, builds the netlink message, and sends it to the port id.
556 * No failure notifications.
558 static void audit_send_reply(__u32 portid
, int seq
, int type
, int done
,
559 int multi
, const void *payload
, int size
)
562 struct task_struct
*tsk
;
563 struct audit_reply
*reply
= kmalloc(sizeof(struct audit_reply
),
569 skb
= audit_make_reply(portid
, seq
, type
, done
, multi
, payload
, size
);
573 reply
->portid
= portid
;
574 reply
->pid
= task_pid_vnr(current
);
577 tsk
= kthread_run(audit_send_reply_thread
, reply
, "audit_send_reply");
586 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
589 static int audit_netlink_ok(struct sk_buff
*skb
, u16 msg_type
)
593 /* Only support the initial namespaces for now. */
594 if ((current_user_ns() != &init_user_ns
) ||
595 (task_active_pid_ns(current
) != &init_pid_ns
))
605 case AUDIT_GET_FEATURE
:
606 case AUDIT_SET_FEATURE
:
607 case AUDIT_LIST_RULES
:
610 case AUDIT_SIGNAL_INFO
:
614 case AUDIT_MAKE_EQUIV
:
615 if (!capable(CAP_AUDIT_CONTROL
))
619 case AUDIT_FIRST_USER_MSG
... AUDIT_LAST_USER_MSG
:
620 case AUDIT_FIRST_USER_MSG2
... AUDIT_LAST_USER_MSG2
:
621 if (!capable(CAP_AUDIT_WRITE
))
624 default: /* bad msg */
631 static int audit_log_common_recv_msg(struct audit_buffer
**ab
, u16 msg_type
)
634 uid_t uid
= from_kuid(&init_user_ns
, current_uid());
636 if (!audit_enabled
&& msg_type
!= AUDIT_USER_AVC
) {
641 *ab
= audit_log_start(NULL
, GFP_KERNEL
, msg_type
);
644 audit_log_format(*ab
, "pid=%d uid=%u", task_tgid_vnr(current
), uid
);
645 audit_log_session_info(*ab
);
646 audit_log_task_context(*ab
);
651 int is_audit_feature_set(int i
)
653 return af
.features
& AUDIT_FEATURE_TO_MASK(i
);
657 static int audit_get_feature(struct sk_buff
*skb
)
661 seq
= nlmsg_hdr(skb
)->nlmsg_seq
;
663 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_GET
, 0, 0,
669 static void audit_log_feature_change(int which
, u32 old_feature
, u32 new_feature
,
670 u32 old_lock
, u32 new_lock
, int res
)
672 struct audit_buffer
*ab
;
674 ab
= audit_log_start(NULL
, GFP_KERNEL
, AUDIT_FEATURE_CHANGE
);
675 audit_log_format(ab
, "feature=%s new=%d old=%d old_lock=%d new_lock=%d res=%d",
676 audit_feature_names
[which
], !!old_feature
, !!new_feature
,
677 !!old_lock
, !!new_lock
, res
);
681 static int audit_set_feature(struct sk_buff
*skb
)
683 struct audit_features
*uaf
;
686 BUILD_BUG_ON(AUDIT_LAST_FEATURE
+ 1 > sizeof(audit_feature_names
)/sizeof(audit_feature_names
[0]));
687 uaf
= nlmsg_data(nlmsg_hdr(skb
));
689 /* if there is ever a version 2 we should handle that here */
691 for (i
= 0; i
<= AUDIT_LAST_FEATURE
; i
++) {
692 u32 feature
= AUDIT_FEATURE_TO_MASK(i
);
693 u32 old_feature
, new_feature
, old_lock
, new_lock
;
695 /* if we are not changing this feature, move along */
696 if (!(feature
& uaf
->mask
))
699 old_feature
= af
.features
& feature
;
700 new_feature
= uaf
->features
& feature
;
701 new_lock
= (uaf
->lock
| af
.lock
) & feature
;
702 old_lock
= af
.lock
& feature
;
704 /* are we changing a locked feature? */
705 if ((af
.lock
& feature
) && (new_feature
!= old_feature
)) {
706 audit_log_feature_change(i
, old_feature
, new_feature
,
707 old_lock
, new_lock
, 0);
711 /* nothing invalid, do the changes */
712 for (i
= 0; i
<= AUDIT_LAST_FEATURE
; i
++) {
713 u32 feature
= AUDIT_FEATURE_TO_MASK(i
);
714 u32 old_feature
, new_feature
, old_lock
, new_lock
;
716 /* if we are not changing this feature, move along */
717 if (!(feature
& uaf
->mask
))
720 old_feature
= af
.features
& feature
;
721 new_feature
= uaf
->features
& feature
;
722 old_lock
= af
.lock
& feature
;
723 new_lock
= (uaf
->lock
| af
.lock
) & feature
;
725 if (new_feature
!= old_feature
)
726 audit_log_feature_change(i
, old_feature
, new_feature
,
727 old_lock
, new_lock
, 1);
730 af
.features
|= feature
;
732 af
.features
&= ~feature
;
739 static int audit_receive_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
743 struct audit_status
*status_get
, status_set
;
745 struct audit_buffer
*ab
;
746 u16 msg_type
= nlh
->nlmsg_type
;
747 struct audit_sig_info
*sig_data
;
751 err
= audit_netlink_ok(skb
, msg_type
);
755 /* As soon as there's any sign of userspace auditd,
756 * start kauditd to talk to it */
758 kauditd_task
= kthread_run(kauditd_thread
, NULL
, "kauditd");
759 if (IS_ERR(kauditd_task
)) {
760 err
= PTR_ERR(kauditd_task
);
765 seq
= nlh
->nlmsg_seq
;
766 data
= nlmsg_data(nlh
);
770 memset(&status_set
, 0, sizeof(status_set
));
771 status_set
.enabled
= audit_enabled
;
772 status_set
.failure
= audit_failure
;
773 status_set
.pid
= audit_pid
;
774 status_set
.rate_limit
= audit_rate_limit
;
775 status_set
.backlog_limit
= audit_backlog_limit
;
776 status_set
.lost
= atomic_read(&audit_lost
);
777 status_set
.backlog
= skb_queue_len(&audit_skb_queue
);
778 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_GET
, 0, 0,
779 &status_set
, sizeof(status_set
));
782 if (nlmsg_len(nlh
) < sizeof(struct audit_status
))
784 status_get
= (struct audit_status
*)data
;
785 if (status_get
->mask
& AUDIT_STATUS_ENABLED
) {
786 err
= audit_set_enabled(status_get
->enabled
);
790 if (status_get
->mask
& AUDIT_STATUS_FAILURE
) {
791 err
= audit_set_failure(status_get
->failure
);
795 if (status_get
->mask
& AUDIT_STATUS_PID
) {
796 int new_pid
= status_get
->pid
;
798 if (audit_enabled
!= AUDIT_OFF
)
799 audit_log_config_change("audit_pid", new_pid
, audit_pid
, 1);
801 audit_nlk_portid
= NETLINK_CB(skb
).portid
;
802 audit_sock
= NETLINK_CB(skb
).sk
;
804 if (status_get
->mask
& AUDIT_STATUS_RATE_LIMIT
) {
805 err
= audit_set_rate_limit(status_get
->rate_limit
);
809 if (status_get
->mask
& AUDIT_STATUS_BACKLOG_LIMIT
)
810 err
= audit_set_backlog_limit(status_get
->backlog_limit
);
812 case AUDIT_GET_FEATURE
:
813 err
= audit_get_feature(skb
);
817 case AUDIT_SET_FEATURE
:
818 err
= audit_set_feature(skb
);
823 case AUDIT_FIRST_USER_MSG
... AUDIT_LAST_USER_MSG
:
824 case AUDIT_FIRST_USER_MSG2
... AUDIT_LAST_USER_MSG2
:
825 if (!audit_enabled
&& msg_type
!= AUDIT_USER_AVC
)
828 err
= audit_filter_user(msg_type
);
831 if (msg_type
== AUDIT_USER_TTY
) {
832 err
= tty_audit_push_current();
836 audit_log_common_recv_msg(&ab
, msg_type
);
837 if (msg_type
!= AUDIT_USER_TTY
)
838 audit_log_format(ab
, " msg='%.*s'",
839 AUDIT_MESSAGE_TEXT_MAX
,
844 audit_log_format(ab
, " data=");
845 size
= nlmsg_len(nlh
);
847 ((unsigned char *)data
)[size
- 1] == '\0')
849 audit_log_n_untrustedstring(ab
, data
, size
);
851 audit_set_portid(ab
, NETLINK_CB(skb
).portid
);
857 if (nlmsg_len(nlh
) < sizeof(struct audit_rule_data
))
859 if (audit_enabled
== AUDIT_LOCKED
) {
860 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
861 audit_log_format(ab
, " audit_enabled=%d res=0", audit_enabled
);
866 case AUDIT_LIST_RULES
:
867 err
= audit_receive_filter(msg_type
, NETLINK_CB(skb
).portid
,
868 seq
, data
, nlmsg_len(nlh
));
872 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
873 audit_log_format(ab
, " op=trim res=1");
876 case AUDIT_MAKE_EQUIV
: {
879 size_t msglen
= nlmsg_len(nlh
);
883 if (msglen
< 2 * sizeof(u32
))
885 memcpy(sizes
, bufp
, 2 * sizeof(u32
));
886 bufp
+= 2 * sizeof(u32
);
887 msglen
-= 2 * sizeof(u32
);
888 old
= audit_unpack_string(&bufp
, &msglen
, sizes
[0]);
893 new = audit_unpack_string(&bufp
, &msglen
, sizes
[1]);
899 /* OK, here comes... */
900 err
= audit_tag_tree(old
, new);
902 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
904 audit_log_format(ab
, " op=make_equiv old=");
905 audit_log_untrustedstring(ab
, old
);
906 audit_log_format(ab
, " new=");
907 audit_log_untrustedstring(ab
, new);
908 audit_log_format(ab
, " res=%d", !err
);
914 case AUDIT_SIGNAL_INFO
:
917 err
= security_secid_to_secctx(audit_sig_sid
, &ctx
, &len
);
921 sig_data
= kmalloc(sizeof(*sig_data
) + len
, GFP_KERNEL
);
924 security_release_secctx(ctx
, len
);
927 sig_data
->uid
= from_kuid(&init_user_ns
, audit_sig_uid
);
928 sig_data
->pid
= audit_sig_pid
;
930 memcpy(sig_data
->ctx
, ctx
, len
);
931 security_release_secctx(ctx
, len
);
933 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_SIGNAL_INFO
,
934 0, 0, sig_data
, sizeof(*sig_data
) + len
);
937 case AUDIT_TTY_GET
: {
938 struct audit_tty_status s
;
939 struct task_struct
*tsk
= current
;
941 spin_lock(&tsk
->sighand
->siglock
);
942 s
.enabled
= tsk
->signal
->audit_tty
;
943 s
.log_passwd
= tsk
->signal
->audit_tty_log_passwd
;
944 spin_unlock(&tsk
->sighand
->siglock
);
946 audit_send_reply(NETLINK_CB(skb
).portid
, seq
,
947 AUDIT_TTY_GET
, 0, 0, &s
, sizeof(s
));
950 case AUDIT_TTY_SET
: {
951 struct audit_tty_status s
;
952 struct task_struct
*tsk
= current
;
954 memset(&s
, 0, sizeof(s
));
955 /* guard against past and future API changes */
956 memcpy(&s
, data
, min_t(size_t, sizeof(s
), nlmsg_len(nlh
)));
957 if ((s
.enabled
!= 0 && s
.enabled
!= 1) ||
958 (s
.log_passwd
!= 0 && s
.log_passwd
!= 1))
961 spin_lock(&tsk
->sighand
->siglock
);
962 tsk
->signal
->audit_tty
= s
.enabled
;
963 tsk
->signal
->audit_tty_log_passwd
= s
.log_passwd
;
964 spin_unlock(&tsk
->sighand
->siglock
);
972 return err
< 0 ? err
: 0;
976 * Get message from skb. Each message is processed by audit_receive_msg.
977 * Malformed skbs with wrong length are discarded silently.
979 static void audit_receive_skb(struct sk_buff
*skb
)
981 struct nlmsghdr
*nlh
;
983 * len MUST be signed for nlmsg_next to be able to dec it below 0
984 * if the nlmsg_len was not aligned
989 nlh
= nlmsg_hdr(skb
);
992 while (nlmsg_ok(nlh
, len
)) {
993 err
= audit_receive_msg(skb
, nlh
);
994 /* if err or if this message says it wants a response */
995 if (err
|| (nlh
->nlmsg_flags
& NLM_F_ACK
))
996 netlink_ack(skb
, nlh
, err
);
998 nlh
= nlmsg_next(nlh
, &len
);
1002 /* Receive messages from netlink socket. */
1003 static void audit_receive(struct sk_buff
*skb
)
1005 mutex_lock(&audit_cmd_mutex
);
1006 audit_receive_skb(skb
);
1007 mutex_unlock(&audit_cmd_mutex
);
1010 static int __net_init
audit_net_init(struct net
*net
)
1012 struct netlink_kernel_cfg cfg
= {
1013 .input
= audit_receive
,
1016 struct audit_net
*aunet
= net_generic(net
, audit_net_id
);
1018 pr_info("audit: initializing netlink socket in namespace\n");
1020 aunet
->nlsk
= netlink_kernel_create(net
, NETLINK_AUDIT
, &cfg
);
1021 if (aunet
->nlsk
== NULL
)
1024 audit_panic("cannot initialize netlink socket in namespace");
1026 aunet
->nlsk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
1030 static void __net_exit
audit_net_exit(struct net
*net
)
1032 struct audit_net
*aunet
= net_generic(net
, audit_net_id
);
1033 struct sock
*sock
= aunet
->nlsk
;
1034 if (sock
== audit_sock
) {
1039 rcu_assign_pointer(aunet
->nlsk
, NULL
);
1041 netlink_kernel_release(sock
);
1044 static struct pernet_operations __net_initdata audit_net_ops
= {
1045 .init
= audit_net_init
,
1046 .exit
= audit_net_exit
,
1047 .id
= &audit_net_id
,
1048 .size
= sizeof(struct audit_net
),
1051 /* Initialize audit support at boot time. */
1052 static int __init
audit_init(void)
1056 if (audit_initialized
== AUDIT_DISABLED
)
1059 pr_info("audit: initializing netlink subsys (%s)\n",
1060 audit_default
? "enabled" : "disabled");
1061 register_pernet_subsys(&audit_net_ops
);
1063 skb_queue_head_init(&audit_skb_queue
);
1064 skb_queue_head_init(&audit_skb_hold_queue
);
1065 audit_initialized
= AUDIT_INITIALIZED
;
1066 audit_enabled
= audit_default
;
1067 audit_ever_enabled
|= !!audit_default
;
1069 audit_log(NULL
, GFP_KERNEL
, AUDIT_KERNEL
, "initialized");
1071 for (i
= 0; i
< AUDIT_INODE_BUCKETS
; i
++)
1072 INIT_LIST_HEAD(&audit_inode_hash
[i
]);
1076 __initcall(audit_init
);
1078 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
1079 static int __init
audit_enable(char *str
)
1081 audit_default
= !!simple_strtol(str
, NULL
, 0);
1083 audit_initialized
= AUDIT_DISABLED
;
1085 printk(KERN_INFO
"audit: %s", audit_default
? "enabled" : "disabled");
1087 if (audit_initialized
== AUDIT_INITIALIZED
) {
1088 audit_enabled
= audit_default
;
1089 audit_ever_enabled
|= !!audit_default
;
1090 } else if (audit_initialized
== AUDIT_UNINITIALIZED
) {
1091 printk(" (after initialization)");
1093 printk(" (until reboot)");
1100 __setup("audit=", audit_enable
);
1102 static void audit_buffer_free(struct audit_buffer
*ab
)
1104 unsigned long flags
;
1112 spin_lock_irqsave(&audit_freelist_lock
, flags
);
1113 if (audit_freelist_count
> AUDIT_MAXFREE
)
1116 audit_freelist_count
++;
1117 list_add(&ab
->list
, &audit_freelist
);
1119 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
1122 static struct audit_buffer
* audit_buffer_alloc(struct audit_context
*ctx
,
1123 gfp_t gfp_mask
, int type
)
1125 unsigned long flags
;
1126 struct audit_buffer
*ab
= NULL
;
1127 struct nlmsghdr
*nlh
;
1129 spin_lock_irqsave(&audit_freelist_lock
, flags
);
1130 if (!list_empty(&audit_freelist
)) {
1131 ab
= list_entry(audit_freelist
.next
,
1132 struct audit_buffer
, list
);
1133 list_del(&ab
->list
);
1134 --audit_freelist_count
;
1136 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
1139 ab
= kmalloc(sizeof(*ab
), gfp_mask
);
1145 ab
->gfp_mask
= gfp_mask
;
1147 ab
->skb
= nlmsg_new(AUDIT_BUFSIZ
, gfp_mask
);
1151 nlh
= nlmsg_put(ab
->skb
, 0, 0, type
, 0, 0);
1161 audit_buffer_free(ab
);
1166 * audit_serial - compute a serial number for the audit record
1168 * Compute a serial number for the audit record. Audit records are
1169 * written to user-space as soon as they are generated, so a complete
1170 * audit record may be written in several pieces. The timestamp of the
1171 * record and this serial number are used by the user-space tools to
1172 * determine which pieces belong to the same audit record. The
1173 * (timestamp,serial) tuple is unique for each syscall and is live from
1174 * syscall entry to syscall exit.
1176 * NOTE: Another possibility is to store the formatted records off the
1177 * audit context (for those records that have a context), and emit them
1178 * all at syscall exit. However, this could delay the reporting of
1179 * significant errors until syscall exit (or never, if the system
1182 unsigned int audit_serial(void)
1184 static DEFINE_SPINLOCK(serial_lock
);
1185 static unsigned int serial
= 0;
1187 unsigned long flags
;
1190 spin_lock_irqsave(&serial_lock
, flags
);
1193 } while (unlikely(!ret
));
1194 spin_unlock_irqrestore(&serial_lock
, flags
);
1199 static inline void audit_get_stamp(struct audit_context
*ctx
,
1200 struct timespec
*t
, unsigned int *serial
)
1202 if (!ctx
|| !auditsc_get_stamp(ctx
, t
, serial
)) {
1204 *serial
= audit_serial();
1209 * Wait for auditd to drain the queue a little
1211 static void wait_for_auditd(unsigned long sleep_time
)
1213 DECLARE_WAITQUEUE(wait
, current
);
1214 set_current_state(TASK_UNINTERRUPTIBLE
);
1215 add_wait_queue(&audit_backlog_wait
, &wait
);
1217 if (audit_backlog_limit
&&
1218 skb_queue_len(&audit_skb_queue
) > audit_backlog_limit
)
1219 schedule_timeout(sleep_time
);
1221 __set_current_state(TASK_RUNNING
);
1222 remove_wait_queue(&audit_backlog_wait
, &wait
);
1226 * audit_log_start - obtain an audit buffer
1227 * @ctx: audit_context (may be NULL)
1228 * @gfp_mask: type of allocation
1229 * @type: audit message type
1231 * Returns audit_buffer pointer on success or NULL on error.
1233 * Obtain an audit buffer. This routine does locking to obtain the
1234 * audit buffer, but then no locking is required for calls to
1235 * audit_log_*format. If the task (ctx) is a task that is currently in a
1236 * syscall, then the syscall is marked as auditable and an audit record
1237 * will be written at syscall exit. If there is no associated task, then
1238 * task context (ctx) should be NULL.
1240 struct audit_buffer
*audit_log_start(struct audit_context
*ctx
, gfp_t gfp_mask
,
1243 struct audit_buffer
*ab
= NULL
;
1245 unsigned int uninitialized_var(serial
);
1247 unsigned long timeout_start
= jiffies
;
1249 if (audit_initialized
!= AUDIT_INITIALIZED
)
1252 if (unlikely(audit_filter_type(type
)))
1255 if (gfp_mask
& __GFP_WAIT
)
1258 reserve
= 5; /* Allow atomic callers to go up to five
1259 entries over the normal backlog limit */
1261 while (audit_backlog_limit
1262 && skb_queue_len(&audit_skb_queue
) > audit_backlog_limit
+ reserve
) {
1263 if (gfp_mask
& __GFP_WAIT
&& audit_backlog_wait_time
) {
1264 unsigned long sleep_time
;
1266 sleep_time
= timeout_start
+ audit_backlog_wait_time
-
1268 if ((long)sleep_time
> 0) {
1269 wait_for_auditd(sleep_time
);
1273 if (audit_rate_check() && printk_ratelimit())
1275 "audit: audit_backlog=%d > "
1276 "audit_backlog_limit=%d\n",
1277 skb_queue_len(&audit_skb_queue
),
1278 audit_backlog_limit
);
1279 audit_log_lost("backlog limit exceeded");
1280 audit_backlog_wait_time
= audit_backlog_wait_overflow
;
1281 wake_up(&audit_backlog_wait
);
1285 ab
= audit_buffer_alloc(ctx
, gfp_mask
, type
);
1287 audit_log_lost("out of memory in audit_log_start");
1291 audit_get_stamp(ab
->ctx
, &t
, &serial
);
1293 audit_log_format(ab
, "audit(%lu.%03lu:%u): ",
1294 t
.tv_sec
, t
.tv_nsec
/1000000, serial
);
1299 * audit_expand - expand skb in the audit buffer
1301 * @extra: space to add at tail of the skb
1303 * Returns 0 (no space) on failed expansion, or available space if
1306 static inline int audit_expand(struct audit_buffer
*ab
, int extra
)
1308 struct sk_buff
*skb
= ab
->skb
;
1309 int oldtail
= skb_tailroom(skb
);
1310 int ret
= pskb_expand_head(skb
, 0, extra
, ab
->gfp_mask
);
1311 int newtail
= skb_tailroom(skb
);
1314 audit_log_lost("out of memory in audit_expand");
1318 skb
->truesize
+= newtail
- oldtail
;
1323 * Format an audit message into the audit buffer. If there isn't enough
1324 * room in the audit buffer, more room will be allocated and vsnprint
1325 * will be called a second time. Currently, we assume that a printk
1326 * can't format message larger than 1024 bytes, so we don't either.
1328 static void audit_log_vformat(struct audit_buffer
*ab
, const char *fmt
,
1332 struct sk_buff
*skb
;
1340 avail
= skb_tailroom(skb
);
1342 avail
= audit_expand(ab
, AUDIT_BUFSIZ
);
1346 va_copy(args2
, args
);
1347 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args
);
1349 /* The printk buffer is 1024 bytes long, so if we get
1350 * here and AUDIT_BUFSIZ is at least 1024, then we can
1351 * log everything that printk could have logged. */
1352 avail
= audit_expand(ab
,
1353 max_t(unsigned, AUDIT_BUFSIZ
, 1+len
-avail
));
1356 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args2
);
1367 * audit_log_format - format a message into the audit buffer.
1369 * @fmt: format string
1370 * @...: optional parameters matching @fmt string
1372 * All the work is done in audit_log_vformat.
1374 void audit_log_format(struct audit_buffer
*ab
, const char *fmt
, ...)
1380 va_start(args
, fmt
);
1381 audit_log_vformat(ab
, fmt
, args
);
1386 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1387 * @ab: the audit_buffer
1388 * @buf: buffer to convert to hex
1389 * @len: length of @buf to be converted
1391 * No return value; failure to expand is silently ignored.
1393 * This function will take the passed buf and convert it into a string of
1394 * ascii hex digits. The new string is placed onto the skb.
1396 void audit_log_n_hex(struct audit_buffer
*ab
, const unsigned char *buf
,
1399 int i
, avail
, new_len
;
1401 struct sk_buff
*skb
;
1402 static const unsigned char *hex
= "0123456789ABCDEF";
1409 avail
= skb_tailroom(skb
);
1411 if (new_len
>= avail
) {
1412 /* Round the buffer request up to the next multiple */
1413 new_len
= AUDIT_BUFSIZ
*(((new_len
-avail
)/AUDIT_BUFSIZ
) + 1);
1414 avail
= audit_expand(ab
, new_len
);
1419 ptr
= skb_tail_pointer(skb
);
1420 for (i
=0; i
<len
; i
++) {
1421 *ptr
++ = hex
[(buf
[i
] & 0xF0)>>4]; /* Upper nibble */
1422 *ptr
++ = hex
[buf
[i
] & 0x0F]; /* Lower nibble */
1425 skb_put(skb
, len
<< 1); /* new string is twice the old string */
1429 * Format a string of no more than slen characters into the audit buffer,
1430 * enclosed in quote marks.
1432 void audit_log_n_string(struct audit_buffer
*ab
, const char *string
,
1437 struct sk_buff
*skb
;
1444 avail
= skb_tailroom(skb
);
1445 new_len
= slen
+ 3; /* enclosing quotes + null terminator */
1446 if (new_len
> avail
) {
1447 avail
= audit_expand(ab
, new_len
);
1451 ptr
= skb_tail_pointer(skb
);
1453 memcpy(ptr
, string
, slen
);
1457 skb_put(skb
, slen
+ 2); /* don't include null terminator */
1461 * audit_string_contains_control - does a string need to be logged in hex
1462 * @string: string to be checked
1463 * @len: max length of the string to check
1465 int audit_string_contains_control(const char *string
, size_t len
)
1467 const unsigned char *p
;
1468 for (p
= string
; p
< (const unsigned char *)string
+ len
; p
++) {
1469 if (*p
== '"' || *p
< 0x21 || *p
> 0x7e)
1476 * audit_log_n_untrustedstring - log a string that may contain random characters
1478 * @len: length of string (not including trailing null)
1479 * @string: string to be logged
1481 * This code will escape a string that is passed to it if the string
1482 * contains a control character, unprintable character, double quote mark,
1483 * or a space. Unescaped strings will start and end with a double quote mark.
1484 * Strings that are escaped are printed in hex (2 digits per char).
1486 * The caller specifies the number of characters in the string to log, which may
1487 * or may not be the entire string.
1489 void audit_log_n_untrustedstring(struct audit_buffer
*ab
, const char *string
,
1492 if (audit_string_contains_control(string
, len
))
1493 audit_log_n_hex(ab
, string
, len
);
1495 audit_log_n_string(ab
, string
, len
);
1499 * audit_log_untrustedstring - log a string that may contain random characters
1501 * @string: string to be logged
1503 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1504 * determine string length.
1506 void audit_log_untrustedstring(struct audit_buffer
*ab
, const char *string
)
1508 audit_log_n_untrustedstring(ab
, string
, strlen(string
));
1511 /* This is a helper-function to print the escaped d_path */
1512 void audit_log_d_path(struct audit_buffer
*ab
, const char *prefix
,
1513 const struct path
*path
)
1518 audit_log_format(ab
, "%s", prefix
);
1520 /* We will allow 11 spaces for ' (deleted)' to be appended */
1521 pathname
= kmalloc(PATH_MAX
+11, ab
->gfp_mask
);
1523 audit_log_string(ab
, "<no_memory>");
1526 p
= d_path(path
, pathname
, PATH_MAX
+11);
1527 if (IS_ERR(p
)) { /* Should never happen since we send PATH_MAX */
1528 /* FIXME: can we save some information here? */
1529 audit_log_string(ab
, "<too_long>");
1531 audit_log_untrustedstring(ab
, p
);
1535 void audit_log_session_info(struct audit_buffer
*ab
)
1537 u32 sessionid
= audit_get_sessionid(current
);
1538 uid_t auid
= from_kuid(&init_user_ns
, audit_get_loginuid(current
));
1540 audit_log_format(ab
, " auid=%u ses=%u", auid
, sessionid
);
1543 void audit_log_key(struct audit_buffer
*ab
, char *key
)
1545 audit_log_format(ab
, " key=");
1547 audit_log_untrustedstring(ab
, key
);
1549 audit_log_format(ab
, "(null)");
1552 void audit_log_cap(struct audit_buffer
*ab
, char *prefix
, kernel_cap_t
*cap
)
1556 audit_log_format(ab
, " %s=", prefix
);
1557 CAP_FOR_EACH_U32(i
) {
1558 audit_log_format(ab
, "%08x",
1559 cap
->cap
[(_KERNEL_CAPABILITY_U32S
-1) - i
]);
1563 void audit_log_fcaps(struct audit_buffer
*ab
, struct audit_names
*name
)
1565 kernel_cap_t
*perm
= &name
->fcap
.permitted
;
1566 kernel_cap_t
*inh
= &name
->fcap
.inheritable
;
1569 if (!cap_isclear(*perm
)) {
1570 audit_log_cap(ab
, "cap_fp", perm
);
1573 if (!cap_isclear(*inh
)) {
1574 audit_log_cap(ab
, "cap_fi", inh
);
1579 audit_log_format(ab
, " cap_fe=%d cap_fver=%x",
1580 name
->fcap
.fE
, name
->fcap_ver
);
1583 static inline int audit_copy_fcaps(struct audit_names
*name
,
1584 const struct dentry
*dentry
)
1586 struct cpu_vfs_cap_data caps
;
1592 rc
= get_vfs_caps_from_disk(dentry
, &caps
);
1596 name
->fcap
.permitted
= caps
.permitted
;
1597 name
->fcap
.inheritable
= caps
.inheritable
;
1598 name
->fcap
.fE
= !!(caps
.magic_etc
& VFS_CAP_FLAGS_EFFECTIVE
);
1599 name
->fcap_ver
= (caps
.magic_etc
& VFS_CAP_REVISION_MASK
) >>
1600 VFS_CAP_REVISION_SHIFT
;
1605 /* Copy inode data into an audit_names. */
1606 void audit_copy_inode(struct audit_names
*name
, const struct dentry
*dentry
,
1607 const struct inode
*inode
)
1609 name
->ino
= inode
->i_ino
;
1610 name
->dev
= inode
->i_sb
->s_dev
;
1611 name
->mode
= inode
->i_mode
;
1612 name
->uid
= inode
->i_uid
;
1613 name
->gid
= inode
->i_gid
;
1614 name
->rdev
= inode
->i_rdev
;
1615 security_inode_getsecid(inode
, &name
->osid
);
1616 audit_copy_fcaps(name
, dentry
);
1620 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1621 * @context: audit_context for the task
1622 * @n: audit_names structure with reportable details
1623 * @path: optional path to report instead of audit_names->name
1624 * @record_num: record number to report when handling a list of names
1625 * @call_panic: optional pointer to int that will be updated if secid fails
1627 void audit_log_name(struct audit_context
*context
, struct audit_names
*n
,
1628 struct path
*path
, int record_num
, int *call_panic
)
1630 struct audit_buffer
*ab
;
1631 ab
= audit_log_start(context
, GFP_KERNEL
, AUDIT_PATH
);
1635 audit_log_format(ab
, "item=%d", record_num
);
1638 audit_log_d_path(ab
, " name=", path
);
1640 switch (n
->name_len
) {
1641 case AUDIT_NAME_FULL
:
1642 /* log the full path */
1643 audit_log_format(ab
, " name=");
1644 audit_log_untrustedstring(ab
, n
->name
->name
);
1647 /* name was specified as a relative path and the
1648 * directory component is the cwd */
1649 audit_log_d_path(ab
, " name=", &context
->pwd
);
1652 /* log the name's directory component */
1653 audit_log_format(ab
, " name=");
1654 audit_log_n_untrustedstring(ab
, n
->name
->name
,
1658 audit_log_format(ab
, " name=(null)");
1660 if (n
->ino
!= (unsigned long)-1) {
1661 audit_log_format(ab
, " inode=%lu"
1662 " dev=%02x:%02x mode=%#ho"
1663 " ouid=%u ogid=%u rdev=%02x:%02x",
1668 from_kuid(&init_user_ns
, n
->uid
),
1669 from_kgid(&init_user_ns
, n
->gid
),
1676 if (security_secid_to_secctx(
1677 n
->osid
, &ctx
, &len
)) {
1678 audit_log_format(ab
, " osid=%u", n
->osid
);
1682 audit_log_format(ab
, " obj=%s", ctx
);
1683 security_release_secctx(ctx
, len
);
1687 /* log the audit_names record type */
1688 audit_log_format(ab
, " nametype=");
1690 case AUDIT_TYPE_NORMAL
:
1691 audit_log_format(ab
, "NORMAL");
1693 case AUDIT_TYPE_PARENT
:
1694 audit_log_format(ab
, "PARENT");
1696 case AUDIT_TYPE_CHILD_DELETE
:
1697 audit_log_format(ab
, "DELETE");
1699 case AUDIT_TYPE_CHILD_CREATE
:
1700 audit_log_format(ab
, "CREATE");
1703 audit_log_format(ab
, "UNKNOWN");
1707 audit_log_fcaps(ab
, n
);
1711 int audit_log_task_context(struct audit_buffer
*ab
)
1718 security_task_getsecid(current
, &sid
);
1722 error
= security_secid_to_secctx(sid
, &ctx
, &len
);
1724 if (error
!= -EINVAL
)
1729 audit_log_format(ab
, " subj=%s", ctx
);
1730 security_release_secctx(ctx
, len
);
1734 audit_panic("error in audit_log_task_context");
1737 EXPORT_SYMBOL(audit_log_task_context
);
1739 void audit_log_task_info(struct audit_buffer
*ab
, struct task_struct
*tsk
)
1741 const struct cred
*cred
;
1742 char name
[sizeof(tsk
->comm
)];
1743 struct mm_struct
*mm
= tsk
->mm
;
1749 /* tsk == current */
1750 cred
= current_cred();
1752 spin_lock_irq(&tsk
->sighand
->siglock
);
1753 if (tsk
->signal
&& tsk
->signal
->tty
&& tsk
->signal
->tty
->name
)
1754 tty
= tsk
->signal
->tty
->name
;
1757 spin_unlock_irq(&tsk
->sighand
->siglock
);
1759 audit_log_format(ab
,
1760 " ppid=%ld pid=%d auid=%u uid=%u gid=%u"
1761 " euid=%u suid=%u fsuid=%u"
1762 " egid=%u sgid=%u fsgid=%u tty=%s ses=%u",
1765 from_kuid(&init_user_ns
, audit_get_loginuid(tsk
)),
1766 from_kuid(&init_user_ns
, cred
->uid
),
1767 from_kgid(&init_user_ns
, cred
->gid
),
1768 from_kuid(&init_user_ns
, cred
->euid
),
1769 from_kuid(&init_user_ns
, cred
->suid
),
1770 from_kuid(&init_user_ns
, cred
->fsuid
),
1771 from_kgid(&init_user_ns
, cred
->egid
),
1772 from_kgid(&init_user_ns
, cred
->sgid
),
1773 from_kgid(&init_user_ns
, cred
->fsgid
),
1774 tty
, audit_get_sessionid(tsk
));
1776 get_task_comm(name
, tsk
);
1777 audit_log_format(ab
, " comm=");
1778 audit_log_untrustedstring(ab
, name
);
1781 down_read(&mm
->mmap_sem
);
1783 audit_log_d_path(ab
, " exe=", &mm
->exe_file
->f_path
);
1784 up_read(&mm
->mmap_sem
);
1786 audit_log_task_context(ab
);
1788 EXPORT_SYMBOL(audit_log_task_info
);
1791 * audit_log_link_denied - report a link restriction denial
1792 * @operation: specific link opreation
1793 * @link: the path that triggered the restriction
1795 void audit_log_link_denied(const char *operation
, struct path
*link
)
1797 struct audit_buffer
*ab
;
1798 struct audit_names
*name
;
1800 name
= kzalloc(sizeof(*name
), GFP_NOFS
);
1804 /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
1805 ab
= audit_log_start(current
->audit_context
, GFP_KERNEL
,
1809 audit_log_format(ab
, "op=%s", operation
);
1810 audit_log_task_info(ab
, current
);
1811 audit_log_format(ab
, " res=0");
1814 /* Generate AUDIT_PATH record with object. */
1815 name
->type
= AUDIT_TYPE_NORMAL
;
1816 audit_copy_inode(name
, link
->dentry
, link
->dentry
->d_inode
);
1817 audit_log_name(current
->audit_context
, name
, link
, 0, NULL
);
1823 * audit_log_end - end one audit record
1824 * @ab: the audit_buffer
1826 * The netlink_* functions cannot be called inside an irq context, so
1827 * the audit buffer is placed on a queue and a tasklet is scheduled to
1828 * remove them from the queue outside the irq context. May be called in
1831 void audit_log_end(struct audit_buffer
*ab
)
1835 if (!audit_rate_check()) {
1836 audit_log_lost("rate limit exceeded");
1838 struct nlmsghdr
*nlh
= nlmsg_hdr(ab
->skb
);
1839 nlh
->nlmsg_len
= ab
->skb
->len
- NLMSG_HDRLEN
;
1842 skb_queue_tail(&audit_skb_queue
, ab
->skb
);
1843 wake_up_interruptible(&kauditd_wait
);
1845 audit_printk_skb(ab
->skb
);
1849 audit_buffer_free(ab
);
1853 * audit_log - Log an audit record
1854 * @ctx: audit context
1855 * @gfp_mask: type of allocation
1856 * @type: audit message type
1857 * @fmt: format string to use
1858 * @...: variable parameters matching the format string
1860 * This is a convenience function that calls audit_log_start,
1861 * audit_log_vformat, and audit_log_end. It may be called
1864 void audit_log(struct audit_context
*ctx
, gfp_t gfp_mask
, int type
,
1865 const char *fmt
, ...)
1867 struct audit_buffer
*ab
;
1870 ab
= audit_log_start(ctx
, gfp_mask
, type
);
1872 va_start(args
, fmt
);
1873 audit_log_vformat(ab
, fmt
, args
);
1879 #ifdef CONFIG_SECURITY
1881 * audit_log_secctx - Converts and logs SELinux context
1883 * @secid: security number
1885 * This is a helper function that calls security_secid_to_secctx to convert
1886 * secid to secctx and then adds the (converted) SELinux context to the audit
1887 * log by calling audit_log_format, thus also preventing leak of internal secid
1888 * to userspace. If secid cannot be converted audit_panic is called.
1890 void audit_log_secctx(struct audit_buffer
*ab
, u32 secid
)
1895 if (security_secid_to_secctx(secid
, &secctx
, &len
)) {
1896 audit_panic("Cannot convert secid to context");
1898 audit_log_format(ab
, " obj=%s", secctx
);
1899 security_release_secctx(secctx
, len
);
1902 EXPORT_SYMBOL(audit_log_secctx
);
1905 EXPORT_SYMBOL(audit_log_start
);
1906 EXPORT_SYMBOL(audit_log_end
);
1907 EXPORT_SYMBOL(audit_log_format
);
1908 EXPORT_SYMBOL(audit_log
);