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 #define AUDIT_BACKLOG_WAIT_TIME (60 * HZ)
107 static int audit_backlog_wait_time
= AUDIT_BACKLOG_WAIT_TIME
;
108 static int audit_backlog_wait_overflow
= 0;
110 /* The identity of the user shutting down the audit system. */
111 kuid_t audit_sig_uid
= INVALID_UID
;
112 pid_t audit_sig_pid
= -1;
113 u32 audit_sig_sid
= 0;
115 /* Records can be lost in several ways:
116 0) [suppressed in audit_alloc]
117 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
118 2) out of memory in audit_log_move [alloc_skb]
119 3) suppressed due to audit_rate_limit
120 4) suppressed due to audit_backlog_limit
122 static atomic_t audit_lost
= ATOMIC_INIT(0);
124 /* The netlink socket. */
125 static struct sock
*audit_sock
;
128 /* Hash for inode-based rules */
129 struct list_head audit_inode_hash
[AUDIT_INODE_BUCKETS
];
131 /* The audit_freelist is a list of pre-allocated audit buffers (if more
132 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
133 * being placed on the freelist). */
134 static DEFINE_SPINLOCK(audit_freelist_lock
);
135 static int audit_freelist_count
;
136 static LIST_HEAD(audit_freelist
);
138 static struct sk_buff_head audit_skb_queue
;
139 /* queue of skbs to send to auditd when/if it comes back */
140 static struct sk_buff_head audit_skb_hold_queue
;
141 static struct task_struct
*kauditd_task
;
142 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait
);
143 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait
);
145 static struct audit_features af
= {.vers
= AUDIT_FEATURE_VERSION
,
150 static char *audit_feature_names
[2] = {
151 "only_unset_loginuid",
152 "loginuid_immutable",
156 /* Serialize requests from userspace. */
157 DEFINE_MUTEX(audit_cmd_mutex
);
159 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
160 * audit records. Since printk uses a 1024 byte buffer, this buffer
161 * should be at least that large. */
162 #define AUDIT_BUFSIZ 1024
164 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
165 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
166 #define AUDIT_MAXFREE (2*NR_CPUS)
168 /* The audit_buffer is used when formatting an audit record. The caller
169 * locks briefly to get the record off the freelist or to allocate the
170 * buffer, and locks briefly to send the buffer to the netlink layer or
171 * to place it on a transmit queue. Multiple audit_buffers can be in
172 * use simultaneously. */
173 struct audit_buffer
{
174 struct list_head list
;
175 struct sk_buff
*skb
; /* formatted skb ready to send */
176 struct audit_context
*ctx
; /* NULL or associated context */
186 static void audit_set_portid(struct audit_buffer
*ab
, __u32 portid
)
189 struct nlmsghdr
*nlh
= nlmsg_hdr(ab
->skb
);
190 nlh
->nlmsg_pid
= portid
;
194 void audit_panic(const char *message
)
196 switch (audit_failure
)
198 case AUDIT_FAIL_SILENT
:
200 case AUDIT_FAIL_PRINTK
:
201 if (printk_ratelimit())
202 printk(KERN_ERR
"audit: %s\n", message
);
204 case AUDIT_FAIL_PANIC
:
205 /* test audit_pid since printk is always losey, why bother? */
207 panic("audit: %s\n", message
);
212 static inline int audit_rate_check(void)
214 static unsigned long last_check
= 0;
215 static int messages
= 0;
216 static DEFINE_SPINLOCK(lock
);
219 unsigned long elapsed
;
222 if (!audit_rate_limit
) return 1;
224 spin_lock_irqsave(&lock
, flags
);
225 if (++messages
< audit_rate_limit
) {
229 elapsed
= now
- last_check
;
236 spin_unlock_irqrestore(&lock
, flags
);
242 * audit_log_lost - conditionally log lost audit message event
243 * @message: the message stating reason for lost audit message
245 * Emit at least 1 message per second, even if audit_rate_check is
247 * Always increment the lost messages counter.
249 void audit_log_lost(const char *message
)
251 static unsigned long last_msg
= 0;
252 static DEFINE_SPINLOCK(lock
);
257 atomic_inc(&audit_lost
);
259 print
= (audit_failure
== AUDIT_FAIL_PANIC
|| !audit_rate_limit
);
262 spin_lock_irqsave(&lock
, flags
);
264 if (now
- last_msg
> HZ
) {
268 spin_unlock_irqrestore(&lock
, flags
);
272 if (printk_ratelimit())
274 "audit: audit_lost=%d audit_rate_limit=%d "
275 "audit_backlog_limit=%d\n",
276 atomic_read(&audit_lost
),
278 audit_backlog_limit
);
279 audit_panic(message
);
283 static int audit_log_config_change(char *function_name
, int new, int old
,
286 struct audit_buffer
*ab
;
289 ab
= audit_log_start(NULL
, GFP_KERNEL
, AUDIT_CONFIG_CHANGE
);
292 audit_log_format(ab
, "%s=%d old=%d", function_name
, new, old
);
293 audit_log_session_info(ab
);
294 rc
= audit_log_task_context(ab
);
296 allow_changes
= 0; /* Something weird, deny request */
297 audit_log_format(ab
, " res=%d", allow_changes
);
302 static int audit_do_config_change(char *function_name
, int *to_change
, int new)
304 int allow_changes
, rc
= 0, old
= *to_change
;
306 /* check if we are locked */
307 if (audit_enabled
== AUDIT_LOCKED
)
312 if (audit_enabled
!= AUDIT_OFF
) {
313 rc
= audit_log_config_change(function_name
, new, old
, allow_changes
);
318 /* If we are allowed, make the change */
319 if (allow_changes
== 1)
321 /* Not allowed, update reason */
327 static int audit_set_rate_limit(int limit
)
329 return audit_do_config_change("audit_rate_limit", &audit_rate_limit
, limit
);
332 static int audit_set_backlog_limit(int limit
)
334 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit
, limit
);
337 static int audit_set_enabled(int state
)
340 if (state
< AUDIT_OFF
|| state
> AUDIT_LOCKED
)
343 rc
= audit_do_config_change("audit_enabled", &audit_enabled
, state
);
345 audit_ever_enabled
|= !!state
;
350 static int audit_set_failure(int state
)
352 if (state
!= AUDIT_FAIL_SILENT
353 && state
!= AUDIT_FAIL_PRINTK
354 && state
!= AUDIT_FAIL_PANIC
)
357 return audit_do_config_change("audit_failure", &audit_failure
, state
);
361 * Queue skbs to be sent to auditd when/if it comes back. These skbs should
362 * already have been sent via prink/syslog and so if these messages are dropped
363 * it is not a huge concern since we already passed the audit_log_lost()
364 * notification and stuff. This is just nice to get audit messages during
365 * boot before auditd is running or messages generated while auditd is stopped.
366 * This only holds messages is audit_default is set, aka booting with audit=1
367 * or building your kernel that way.
369 static void audit_hold_skb(struct sk_buff
*skb
)
372 skb_queue_len(&audit_skb_hold_queue
) < audit_backlog_limit
)
373 skb_queue_tail(&audit_skb_hold_queue
, skb
);
379 * For one reason or another this nlh isn't getting delivered to the userspace
380 * audit daemon, just send it to printk.
382 static void audit_printk_skb(struct sk_buff
*skb
)
384 struct nlmsghdr
*nlh
= nlmsg_hdr(skb
);
385 char *data
= nlmsg_data(nlh
);
387 if (nlh
->nlmsg_type
!= AUDIT_EOE
) {
388 if (printk_ratelimit())
389 printk(KERN_NOTICE
"type=%d %s\n", nlh
->nlmsg_type
, data
);
391 audit_log_lost("printk limit exceeded\n");
397 static void kauditd_send_skb(struct sk_buff
*skb
)
400 /* take a reference in case we can't send it and we want to hold it */
402 err
= netlink_unicast(audit_sock
, skb
, audit_nlk_portid
, 0);
404 BUG_ON(err
!= -ECONNREFUSED
); /* Shouldn't happen */
405 printk(KERN_ERR
"audit: *NO* daemon at audit_pid=%d\n", audit_pid
);
406 audit_log_lost("auditd disappeared\n");
409 /* we might get lucky and get this in the next auditd */
412 /* drop the extra reference if sent ok */
417 * flush_hold_queue - empty the hold queue if auditd appears
419 * If auditd just started, drain the queue of messages already
420 * sent to syslog/printk. Remember loss here is ok. We already
421 * called audit_log_lost() if it didn't go out normally. so the
422 * race between the skb_dequeue and the next check for audit_pid
425 * If you ever find kauditd to be too slow we can get a perf win
426 * by doing our own locking and keeping better track if there
427 * are messages in this queue. I don't see the need now, but
428 * in 5 years when I want to play with this again I'll see this
429 * note and still have no friggin idea what i'm thinking today.
431 static void flush_hold_queue(void)
435 if (!audit_default
|| !audit_pid
)
438 skb
= skb_dequeue(&audit_skb_hold_queue
);
442 while (skb
&& audit_pid
) {
443 kauditd_send_skb(skb
);
444 skb
= skb_dequeue(&audit_skb_hold_queue
);
448 * if auditd just disappeared but we
449 * dequeued an skb we need to drop ref
455 static int kauditd_thread(void *dummy
)
458 while (!kthread_should_stop()) {
460 DECLARE_WAITQUEUE(wait
, current
);
464 skb
= skb_dequeue(&audit_skb_queue
);
467 if (skb_queue_len(&audit_skb_queue
) <= audit_backlog_limit
)
468 wake_up(&audit_backlog_wait
);
470 kauditd_send_skb(skb
);
472 audit_printk_skb(skb
);
475 set_current_state(TASK_INTERRUPTIBLE
);
476 add_wait_queue(&kauditd_wait
, &wait
);
478 if (!skb_queue_len(&audit_skb_queue
)) {
483 __set_current_state(TASK_RUNNING
);
484 remove_wait_queue(&kauditd_wait
, &wait
);
489 int audit_send_list(void *_dest
)
491 struct audit_netlink_list
*dest
= _dest
;
493 struct net
*net
= get_net_ns_by_pid(dest
->pid
);
494 struct audit_net
*aunet
= net_generic(net
, audit_net_id
);
496 /* wait for parent to finish and send an ACK */
497 mutex_lock(&audit_cmd_mutex
);
498 mutex_unlock(&audit_cmd_mutex
);
500 while ((skb
= __skb_dequeue(&dest
->q
)) != NULL
)
501 netlink_unicast(aunet
->nlsk
, skb
, dest
->portid
, 0);
508 struct sk_buff
*audit_make_reply(__u32 portid
, int seq
, int type
, int done
,
509 int multi
, const void *payload
, int size
)
512 struct nlmsghdr
*nlh
;
514 int flags
= multi
? NLM_F_MULTI
: 0;
515 int t
= done
? NLMSG_DONE
: type
;
517 skb
= nlmsg_new(size
, GFP_KERNEL
);
521 nlh
= nlmsg_put(skb
, portid
, seq
, t
, size
, flags
);
524 data
= nlmsg_data(nlh
);
525 memcpy(data
, payload
, size
);
533 static int audit_send_reply_thread(void *arg
)
535 struct audit_reply
*reply
= (struct audit_reply
*)arg
;
536 struct net
*net
= get_net_ns_by_pid(reply
->pid
);
537 struct audit_net
*aunet
= net_generic(net
, audit_net_id
);
539 mutex_lock(&audit_cmd_mutex
);
540 mutex_unlock(&audit_cmd_mutex
);
542 /* Ignore failure. It'll only happen if the sender goes away,
543 because our timeout is set to infinite. */
544 netlink_unicast(aunet
->nlsk
, reply
->skb
, reply
->portid
, 0);
549 * audit_send_reply - send an audit reply message via netlink
550 * @portid: netlink port to which to send reply
551 * @seq: sequence number
552 * @type: audit message type
553 * @done: done (last) flag
554 * @multi: multi-part message flag
555 * @payload: payload data
556 * @size: payload size
558 * Allocates an skb, builds the netlink message, and sends it to the port id.
559 * No failure notifications.
561 static void audit_send_reply(__u32 portid
, int seq
, int type
, int done
,
562 int multi
, const void *payload
, int size
)
565 struct task_struct
*tsk
;
566 struct audit_reply
*reply
= kmalloc(sizeof(struct audit_reply
),
572 skb
= audit_make_reply(portid
, seq
, type
, done
, multi
, payload
, size
);
576 reply
->portid
= portid
;
577 reply
->pid
= task_pid_vnr(current
);
580 tsk
= kthread_run(audit_send_reply_thread
, reply
, "audit_send_reply");
589 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
592 static int audit_netlink_ok(struct sk_buff
*skb
, u16 msg_type
)
596 /* Only support the initial namespaces for now. */
597 if ((current_user_ns() != &init_user_ns
) ||
598 (task_active_pid_ns(current
) != &init_pid_ns
))
608 case AUDIT_GET_FEATURE
:
609 case AUDIT_SET_FEATURE
:
610 case AUDIT_LIST_RULES
:
613 case AUDIT_SIGNAL_INFO
:
617 case AUDIT_MAKE_EQUIV
:
618 if (!capable(CAP_AUDIT_CONTROL
))
622 case AUDIT_FIRST_USER_MSG
... AUDIT_LAST_USER_MSG
:
623 case AUDIT_FIRST_USER_MSG2
... AUDIT_LAST_USER_MSG2
:
624 if (!capable(CAP_AUDIT_WRITE
))
627 default: /* bad msg */
634 static int audit_log_common_recv_msg(struct audit_buffer
**ab
, u16 msg_type
)
637 uid_t uid
= from_kuid(&init_user_ns
, current_uid());
639 if (!audit_enabled
&& msg_type
!= AUDIT_USER_AVC
) {
644 *ab
= audit_log_start(NULL
, GFP_KERNEL
, msg_type
);
647 audit_log_format(*ab
, "pid=%d uid=%u", task_tgid_vnr(current
), uid
);
648 audit_log_session_info(*ab
);
649 audit_log_task_context(*ab
);
654 int is_audit_feature_set(int i
)
656 return af
.features
& AUDIT_FEATURE_TO_MASK(i
);
660 static int audit_get_feature(struct sk_buff
*skb
)
664 seq
= nlmsg_hdr(skb
)->nlmsg_seq
;
666 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_GET
, 0, 0,
672 static void audit_log_feature_change(int which
, u32 old_feature
, u32 new_feature
,
673 u32 old_lock
, u32 new_lock
, int res
)
675 struct audit_buffer
*ab
;
677 ab
= audit_log_start(NULL
, GFP_KERNEL
, AUDIT_FEATURE_CHANGE
);
678 audit_log_format(ab
, "feature=%s new=%d old=%d old_lock=%d new_lock=%d res=%d",
679 audit_feature_names
[which
], !!old_feature
, !!new_feature
,
680 !!old_lock
, !!new_lock
, res
);
684 static int audit_set_feature(struct sk_buff
*skb
)
686 struct audit_features
*uaf
;
689 BUILD_BUG_ON(AUDIT_LAST_FEATURE
+ 1 > sizeof(audit_feature_names
)/sizeof(audit_feature_names
[0]));
690 uaf
= nlmsg_data(nlmsg_hdr(skb
));
692 /* if there is ever a version 2 we should handle that here */
694 for (i
= 0; i
<= AUDIT_LAST_FEATURE
; i
++) {
695 u32 feature
= AUDIT_FEATURE_TO_MASK(i
);
696 u32 old_feature
, new_feature
, old_lock
, new_lock
;
698 /* if we are not changing this feature, move along */
699 if (!(feature
& uaf
->mask
))
702 old_feature
= af
.features
& feature
;
703 new_feature
= uaf
->features
& feature
;
704 new_lock
= (uaf
->lock
| af
.lock
) & feature
;
705 old_lock
= af
.lock
& feature
;
707 /* are we changing a locked feature? */
708 if ((af
.lock
& feature
) && (new_feature
!= old_feature
)) {
709 audit_log_feature_change(i
, old_feature
, new_feature
,
710 old_lock
, new_lock
, 0);
714 /* nothing invalid, do the changes */
715 for (i
= 0; i
<= AUDIT_LAST_FEATURE
; i
++) {
716 u32 feature
= AUDIT_FEATURE_TO_MASK(i
);
717 u32 old_feature
, new_feature
, old_lock
, new_lock
;
719 /* if we are not changing this feature, move along */
720 if (!(feature
& uaf
->mask
))
723 old_feature
= af
.features
& feature
;
724 new_feature
= uaf
->features
& feature
;
725 old_lock
= af
.lock
& feature
;
726 new_lock
= (uaf
->lock
| af
.lock
) & feature
;
728 if (new_feature
!= old_feature
)
729 audit_log_feature_change(i
, old_feature
, new_feature
,
730 old_lock
, new_lock
, 1);
733 af
.features
|= feature
;
735 af
.features
&= ~feature
;
742 static int audit_receive_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
746 struct audit_status
*status_get
, status_set
;
748 struct audit_buffer
*ab
;
749 u16 msg_type
= nlh
->nlmsg_type
;
750 struct audit_sig_info
*sig_data
;
754 err
= audit_netlink_ok(skb
, msg_type
);
758 /* As soon as there's any sign of userspace auditd,
759 * start kauditd to talk to it */
761 kauditd_task
= kthread_run(kauditd_thread
, NULL
, "kauditd");
762 if (IS_ERR(kauditd_task
)) {
763 err
= PTR_ERR(kauditd_task
);
768 seq
= nlh
->nlmsg_seq
;
769 data
= nlmsg_data(nlh
);
773 memset(&status_set
, 0, sizeof(status_set
));
774 status_set
.enabled
= audit_enabled
;
775 status_set
.failure
= audit_failure
;
776 status_set
.pid
= audit_pid
;
777 status_set
.rate_limit
= audit_rate_limit
;
778 status_set
.backlog_limit
= audit_backlog_limit
;
779 status_set
.lost
= atomic_read(&audit_lost
);
780 status_set
.backlog
= skb_queue_len(&audit_skb_queue
);
781 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_GET
, 0, 0,
782 &status_set
, sizeof(status_set
));
785 if (nlmsg_len(nlh
) < sizeof(struct audit_status
))
787 status_get
= (struct audit_status
*)data
;
788 if (status_get
->mask
& AUDIT_STATUS_ENABLED
) {
789 err
= audit_set_enabled(status_get
->enabled
);
793 if (status_get
->mask
& AUDIT_STATUS_FAILURE
) {
794 err
= audit_set_failure(status_get
->failure
);
798 if (status_get
->mask
& AUDIT_STATUS_PID
) {
799 int new_pid
= status_get
->pid
;
801 if (audit_enabled
!= AUDIT_OFF
)
802 audit_log_config_change("audit_pid", new_pid
, audit_pid
, 1);
804 audit_nlk_portid
= NETLINK_CB(skb
).portid
;
805 audit_sock
= NETLINK_CB(skb
).sk
;
807 if (status_get
->mask
& AUDIT_STATUS_RATE_LIMIT
) {
808 err
= audit_set_rate_limit(status_get
->rate_limit
);
812 if (status_get
->mask
& AUDIT_STATUS_BACKLOG_LIMIT
)
813 err
= audit_set_backlog_limit(status_get
->backlog_limit
);
815 case AUDIT_GET_FEATURE
:
816 err
= audit_get_feature(skb
);
820 case AUDIT_SET_FEATURE
:
821 err
= audit_set_feature(skb
);
826 case AUDIT_FIRST_USER_MSG
... AUDIT_LAST_USER_MSG
:
827 case AUDIT_FIRST_USER_MSG2
... AUDIT_LAST_USER_MSG2
:
828 if (!audit_enabled
&& msg_type
!= AUDIT_USER_AVC
)
831 err
= audit_filter_user(msg_type
);
834 if (msg_type
== AUDIT_USER_TTY
) {
835 err
= tty_audit_push_current();
839 audit_log_common_recv_msg(&ab
, msg_type
);
840 if (msg_type
!= AUDIT_USER_TTY
)
841 audit_log_format(ab
, " msg='%.*s'",
842 AUDIT_MESSAGE_TEXT_MAX
,
847 audit_log_format(ab
, " data=");
848 size
= nlmsg_len(nlh
);
850 ((unsigned char *)data
)[size
- 1] == '\0')
852 audit_log_n_untrustedstring(ab
, data
, size
);
854 audit_set_portid(ab
, NETLINK_CB(skb
).portid
);
860 if (nlmsg_len(nlh
) < sizeof(struct audit_rule_data
))
862 if (audit_enabled
== AUDIT_LOCKED
) {
863 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
864 audit_log_format(ab
, " audit_enabled=%d res=0", audit_enabled
);
869 case AUDIT_LIST_RULES
:
870 err
= audit_receive_filter(msg_type
, NETLINK_CB(skb
).portid
,
871 seq
, data
, nlmsg_len(nlh
));
875 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
876 audit_log_format(ab
, " op=trim res=1");
879 case AUDIT_MAKE_EQUIV
: {
882 size_t msglen
= nlmsg_len(nlh
);
886 if (msglen
< 2 * sizeof(u32
))
888 memcpy(sizes
, bufp
, 2 * sizeof(u32
));
889 bufp
+= 2 * sizeof(u32
);
890 msglen
-= 2 * sizeof(u32
);
891 old
= audit_unpack_string(&bufp
, &msglen
, sizes
[0]);
896 new = audit_unpack_string(&bufp
, &msglen
, sizes
[1]);
902 /* OK, here comes... */
903 err
= audit_tag_tree(old
, new);
905 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
907 audit_log_format(ab
, " op=make_equiv old=");
908 audit_log_untrustedstring(ab
, old
);
909 audit_log_format(ab
, " new=");
910 audit_log_untrustedstring(ab
, new);
911 audit_log_format(ab
, " res=%d", !err
);
917 case AUDIT_SIGNAL_INFO
:
920 err
= security_secid_to_secctx(audit_sig_sid
, &ctx
, &len
);
924 sig_data
= kmalloc(sizeof(*sig_data
) + len
, GFP_KERNEL
);
927 security_release_secctx(ctx
, len
);
930 sig_data
->uid
= from_kuid(&init_user_ns
, audit_sig_uid
);
931 sig_data
->pid
= audit_sig_pid
;
933 memcpy(sig_data
->ctx
, ctx
, len
);
934 security_release_secctx(ctx
, len
);
936 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_SIGNAL_INFO
,
937 0, 0, sig_data
, sizeof(*sig_data
) + len
);
940 case AUDIT_TTY_GET
: {
941 struct audit_tty_status s
;
942 struct task_struct
*tsk
= current
;
944 spin_lock(&tsk
->sighand
->siglock
);
945 s
.enabled
= tsk
->signal
->audit_tty
;
946 s
.log_passwd
= tsk
->signal
->audit_tty_log_passwd
;
947 spin_unlock(&tsk
->sighand
->siglock
);
949 audit_send_reply(NETLINK_CB(skb
).portid
, seq
,
950 AUDIT_TTY_GET
, 0, 0, &s
, sizeof(s
));
953 case AUDIT_TTY_SET
: {
954 struct audit_tty_status s
;
955 struct task_struct
*tsk
= current
;
957 memset(&s
, 0, sizeof(s
));
958 /* guard against past and future API changes */
959 memcpy(&s
, data
, min_t(size_t, sizeof(s
), nlmsg_len(nlh
)));
960 if ((s
.enabled
!= 0 && s
.enabled
!= 1) ||
961 (s
.log_passwd
!= 0 && s
.log_passwd
!= 1))
964 spin_lock(&tsk
->sighand
->siglock
);
965 tsk
->signal
->audit_tty
= s
.enabled
;
966 tsk
->signal
->audit_tty_log_passwd
= s
.log_passwd
;
967 spin_unlock(&tsk
->sighand
->siglock
);
975 return err
< 0 ? err
: 0;
979 * Get message from skb. Each message is processed by audit_receive_msg.
980 * Malformed skbs with wrong length are discarded silently.
982 static void audit_receive_skb(struct sk_buff
*skb
)
984 struct nlmsghdr
*nlh
;
986 * len MUST be signed for nlmsg_next to be able to dec it below 0
987 * if the nlmsg_len was not aligned
992 nlh
= nlmsg_hdr(skb
);
995 while (nlmsg_ok(nlh
, len
)) {
996 err
= audit_receive_msg(skb
, nlh
);
997 /* if err or if this message says it wants a response */
998 if (err
|| (nlh
->nlmsg_flags
& NLM_F_ACK
))
999 netlink_ack(skb
, nlh
, err
);
1001 nlh
= nlmsg_next(nlh
, &len
);
1005 /* Receive messages from netlink socket. */
1006 static void audit_receive(struct sk_buff
*skb
)
1008 mutex_lock(&audit_cmd_mutex
);
1009 audit_receive_skb(skb
);
1010 mutex_unlock(&audit_cmd_mutex
);
1013 static int __net_init
audit_net_init(struct net
*net
)
1015 struct netlink_kernel_cfg cfg
= {
1016 .input
= audit_receive
,
1019 struct audit_net
*aunet
= net_generic(net
, audit_net_id
);
1021 pr_info("audit: initializing netlink socket in namespace\n");
1023 aunet
->nlsk
= netlink_kernel_create(net
, NETLINK_AUDIT
, &cfg
);
1024 if (aunet
->nlsk
== NULL
)
1027 audit_panic("cannot initialize netlink socket in namespace");
1029 aunet
->nlsk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
1033 static void __net_exit
audit_net_exit(struct net
*net
)
1035 struct audit_net
*aunet
= net_generic(net
, audit_net_id
);
1036 struct sock
*sock
= aunet
->nlsk
;
1037 if (sock
== audit_sock
) {
1042 rcu_assign_pointer(aunet
->nlsk
, NULL
);
1044 netlink_kernel_release(sock
);
1047 static struct pernet_operations __net_initdata audit_net_ops
= {
1048 .init
= audit_net_init
,
1049 .exit
= audit_net_exit
,
1050 .id
= &audit_net_id
,
1051 .size
= sizeof(struct audit_net
),
1054 /* Initialize audit support at boot time. */
1055 static int __init
audit_init(void)
1059 if (audit_initialized
== AUDIT_DISABLED
)
1062 pr_info("audit: initializing netlink subsys (%s)\n",
1063 audit_default
? "enabled" : "disabled");
1064 register_pernet_subsys(&audit_net_ops
);
1066 skb_queue_head_init(&audit_skb_queue
);
1067 skb_queue_head_init(&audit_skb_hold_queue
);
1068 audit_initialized
= AUDIT_INITIALIZED
;
1069 audit_enabled
= audit_default
;
1070 audit_ever_enabled
|= !!audit_default
;
1072 audit_log(NULL
, GFP_KERNEL
, AUDIT_KERNEL
, "initialized");
1074 for (i
= 0; i
< AUDIT_INODE_BUCKETS
; i
++)
1075 INIT_LIST_HEAD(&audit_inode_hash
[i
]);
1079 __initcall(audit_init
);
1081 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
1082 static int __init
audit_enable(char *str
)
1084 audit_default
= !!simple_strtol(str
, NULL
, 0);
1086 audit_initialized
= AUDIT_DISABLED
;
1088 printk(KERN_INFO
"audit: %s", audit_default
? "enabled" : "disabled");
1090 if (audit_initialized
== AUDIT_INITIALIZED
) {
1091 audit_enabled
= audit_default
;
1092 audit_ever_enabled
|= !!audit_default
;
1093 } else if (audit_initialized
== AUDIT_UNINITIALIZED
) {
1094 printk(" (after initialization)");
1096 printk(" (until reboot)");
1103 __setup("audit=", audit_enable
);
1105 static void audit_buffer_free(struct audit_buffer
*ab
)
1107 unsigned long flags
;
1115 spin_lock_irqsave(&audit_freelist_lock
, flags
);
1116 if (audit_freelist_count
> AUDIT_MAXFREE
)
1119 audit_freelist_count
++;
1120 list_add(&ab
->list
, &audit_freelist
);
1122 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
1125 static struct audit_buffer
* audit_buffer_alloc(struct audit_context
*ctx
,
1126 gfp_t gfp_mask
, int type
)
1128 unsigned long flags
;
1129 struct audit_buffer
*ab
= NULL
;
1130 struct nlmsghdr
*nlh
;
1132 spin_lock_irqsave(&audit_freelist_lock
, flags
);
1133 if (!list_empty(&audit_freelist
)) {
1134 ab
= list_entry(audit_freelist
.next
,
1135 struct audit_buffer
, list
);
1136 list_del(&ab
->list
);
1137 --audit_freelist_count
;
1139 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
1142 ab
= kmalloc(sizeof(*ab
), gfp_mask
);
1148 ab
->gfp_mask
= gfp_mask
;
1150 ab
->skb
= nlmsg_new(AUDIT_BUFSIZ
, gfp_mask
);
1154 nlh
= nlmsg_put(ab
->skb
, 0, 0, type
, 0, 0);
1164 audit_buffer_free(ab
);
1169 * audit_serial - compute a serial number for the audit record
1171 * Compute a serial number for the audit record. Audit records are
1172 * written to user-space as soon as they are generated, so a complete
1173 * audit record may be written in several pieces. The timestamp of the
1174 * record and this serial number are used by the user-space tools to
1175 * determine which pieces belong to the same audit record. The
1176 * (timestamp,serial) tuple is unique for each syscall and is live from
1177 * syscall entry to syscall exit.
1179 * NOTE: Another possibility is to store the formatted records off the
1180 * audit context (for those records that have a context), and emit them
1181 * all at syscall exit. However, this could delay the reporting of
1182 * significant errors until syscall exit (or never, if the system
1185 unsigned int audit_serial(void)
1187 static DEFINE_SPINLOCK(serial_lock
);
1188 static unsigned int serial
= 0;
1190 unsigned long flags
;
1193 spin_lock_irqsave(&serial_lock
, flags
);
1196 } while (unlikely(!ret
));
1197 spin_unlock_irqrestore(&serial_lock
, flags
);
1202 static inline void audit_get_stamp(struct audit_context
*ctx
,
1203 struct timespec
*t
, unsigned int *serial
)
1205 if (!ctx
|| !auditsc_get_stamp(ctx
, t
, serial
)) {
1207 *serial
= audit_serial();
1212 * Wait for auditd to drain the queue a little
1214 static unsigned long wait_for_auditd(unsigned long sleep_time
)
1216 unsigned long timeout
= sleep_time
;
1217 DECLARE_WAITQUEUE(wait
, current
);
1218 set_current_state(TASK_UNINTERRUPTIBLE
);
1219 add_wait_queue_exclusive(&audit_backlog_wait
, &wait
);
1221 if (audit_backlog_limit
&&
1222 skb_queue_len(&audit_skb_queue
) > audit_backlog_limit
)
1223 timeout
= schedule_timeout(sleep_time
);
1225 __set_current_state(TASK_RUNNING
);
1226 remove_wait_queue(&audit_backlog_wait
, &wait
);
1232 * audit_log_start - obtain an audit buffer
1233 * @ctx: audit_context (may be NULL)
1234 * @gfp_mask: type of allocation
1235 * @type: audit message type
1237 * Returns audit_buffer pointer on success or NULL on error.
1239 * Obtain an audit buffer. This routine does locking to obtain the
1240 * audit buffer, but then no locking is required for calls to
1241 * audit_log_*format. If the task (ctx) is a task that is currently in a
1242 * syscall, then the syscall is marked as auditable and an audit record
1243 * will be written at syscall exit. If there is no associated task, then
1244 * task context (ctx) should be NULL.
1246 struct audit_buffer
*audit_log_start(struct audit_context
*ctx
, gfp_t gfp_mask
,
1249 struct audit_buffer
*ab
= NULL
;
1251 unsigned int uninitialized_var(serial
);
1253 unsigned long timeout_start
= jiffies
;
1255 if (audit_initialized
!= AUDIT_INITIALIZED
)
1258 if (unlikely(audit_filter_type(type
)))
1261 if (gfp_mask
& __GFP_WAIT
)
1264 reserve
= 5; /* Allow atomic callers to go up to five
1265 entries over the normal backlog limit */
1267 while (audit_backlog_limit
1268 && skb_queue_len(&audit_skb_queue
) > audit_backlog_limit
+ reserve
) {
1269 if (gfp_mask
& __GFP_WAIT
&& audit_backlog_wait_time
) {
1270 unsigned long sleep_time
;
1272 sleep_time
= timeout_start
+ audit_backlog_wait_time
-
1274 if ((long)sleep_time
> 0) {
1275 sleep_time
= wait_for_auditd(sleep_time
);
1276 if ((long)sleep_time
> 0)
1280 if (audit_rate_check() && printk_ratelimit())
1282 "audit: audit_backlog=%d > "
1283 "audit_backlog_limit=%d\n",
1284 skb_queue_len(&audit_skb_queue
),
1285 audit_backlog_limit
);
1286 audit_log_lost("backlog limit exceeded");
1287 audit_backlog_wait_time
= audit_backlog_wait_overflow
;
1288 wake_up(&audit_backlog_wait
);
1292 audit_backlog_wait_time
= AUDIT_BACKLOG_WAIT_TIME
;
1294 ab
= audit_buffer_alloc(ctx
, gfp_mask
, type
);
1296 audit_log_lost("out of memory in audit_log_start");
1300 audit_get_stamp(ab
->ctx
, &t
, &serial
);
1302 audit_log_format(ab
, "audit(%lu.%03lu:%u): ",
1303 t
.tv_sec
, t
.tv_nsec
/1000000, serial
);
1308 * audit_expand - expand skb in the audit buffer
1310 * @extra: space to add at tail of the skb
1312 * Returns 0 (no space) on failed expansion, or available space if
1315 static inline int audit_expand(struct audit_buffer
*ab
, int extra
)
1317 struct sk_buff
*skb
= ab
->skb
;
1318 int oldtail
= skb_tailroom(skb
);
1319 int ret
= pskb_expand_head(skb
, 0, extra
, ab
->gfp_mask
);
1320 int newtail
= skb_tailroom(skb
);
1323 audit_log_lost("out of memory in audit_expand");
1327 skb
->truesize
+= newtail
- oldtail
;
1332 * Format an audit message into the audit buffer. If there isn't enough
1333 * room in the audit buffer, more room will be allocated and vsnprint
1334 * will be called a second time. Currently, we assume that a printk
1335 * can't format message larger than 1024 bytes, so we don't either.
1337 static void audit_log_vformat(struct audit_buffer
*ab
, const char *fmt
,
1341 struct sk_buff
*skb
;
1349 avail
= skb_tailroom(skb
);
1351 avail
= audit_expand(ab
, AUDIT_BUFSIZ
);
1355 va_copy(args2
, args
);
1356 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args
);
1358 /* The printk buffer is 1024 bytes long, so if we get
1359 * here and AUDIT_BUFSIZ is at least 1024, then we can
1360 * log everything that printk could have logged. */
1361 avail
= audit_expand(ab
,
1362 max_t(unsigned, AUDIT_BUFSIZ
, 1+len
-avail
));
1365 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args2
);
1376 * audit_log_format - format a message into the audit buffer.
1378 * @fmt: format string
1379 * @...: optional parameters matching @fmt string
1381 * All the work is done in audit_log_vformat.
1383 void audit_log_format(struct audit_buffer
*ab
, const char *fmt
, ...)
1389 va_start(args
, fmt
);
1390 audit_log_vformat(ab
, fmt
, args
);
1395 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1396 * @ab: the audit_buffer
1397 * @buf: buffer to convert to hex
1398 * @len: length of @buf to be converted
1400 * No return value; failure to expand is silently ignored.
1402 * This function will take the passed buf and convert it into a string of
1403 * ascii hex digits. The new string is placed onto the skb.
1405 void audit_log_n_hex(struct audit_buffer
*ab
, const unsigned char *buf
,
1408 int i
, avail
, new_len
;
1410 struct sk_buff
*skb
;
1411 static const unsigned char *hex
= "0123456789ABCDEF";
1418 avail
= skb_tailroom(skb
);
1420 if (new_len
>= avail
) {
1421 /* Round the buffer request up to the next multiple */
1422 new_len
= AUDIT_BUFSIZ
*(((new_len
-avail
)/AUDIT_BUFSIZ
) + 1);
1423 avail
= audit_expand(ab
, new_len
);
1428 ptr
= skb_tail_pointer(skb
);
1429 for (i
=0; i
<len
; i
++) {
1430 *ptr
++ = hex
[(buf
[i
] & 0xF0)>>4]; /* Upper nibble */
1431 *ptr
++ = hex
[buf
[i
] & 0x0F]; /* Lower nibble */
1434 skb_put(skb
, len
<< 1); /* new string is twice the old string */
1438 * Format a string of no more than slen characters into the audit buffer,
1439 * enclosed in quote marks.
1441 void audit_log_n_string(struct audit_buffer
*ab
, const char *string
,
1446 struct sk_buff
*skb
;
1453 avail
= skb_tailroom(skb
);
1454 new_len
= slen
+ 3; /* enclosing quotes + null terminator */
1455 if (new_len
> avail
) {
1456 avail
= audit_expand(ab
, new_len
);
1460 ptr
= skb_tail_pointer(skb
);
1462 memcpy(ptr
, string
, slen
);
1466 skb_put(skb
, slen
+ 2); /* don't include null terminator */
1470 * audit_string_contains_control - does a string need to be logged in hex
1471 * @string: string to be checked
1472 * @len: max length of the string to check
1474 int audit_string_contains_control(const char *string
, size_t len
)
1476 const unsigned char *p
;
1477 for (p
= string
; p
< (const unsigned char *)string
+ len
; p
++) {
1478 if (*p
== '"' || *p
< 0x21 || *p
> 0x7e)
1485 * audit_log_n_untrustedstring - log a string that may contain random characters
1487 * @len: length of string (not including trailing null)
1488 * @string: string to be logged
1490 * This code will escape a string that is passed to it if the string
1491 * contains a control character, unprintable character, double quote mark,
1492 * or a space. Unescaped strings will start and end with a double quote mark.
1493 * Strings that are escaped are printed in hex (2 digits per char).
1495 * The caller specifies the number of characters in the string to log, which may
1496 * or may not be the entire string.
1498 void audit_log_n_untrustedstring(struct audit_buffer
*ab
, const char *string
,
1501 if (audit_string_contains_control(string
, len
))
1502 audit_log_n_hex(ab
, string
, len
);
1504 audit_log_n_string(ab
, string
, len
);
1508 * audit_log_untrustedstring - log a string that may contain random characters
1510 * @string: string to be logged
1512 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1513 * determine string length.
1515 void audit_log_untrustedstring(struct audit_buffer
*ab
, const char *string
)
1517 audit_log_n_untrustedstring(ab
, string
, strlen(string
));
1520 /* This is a helper-function to print the escaped d_path */
1521 void audit_log_d_path(struct audit_buffer
*ab
, const char *prefix
,
1522 const struct path
*path
)
1527 audit_log_format(ab
, "%s", prefix
);
1529 /* We will allow 11 spaces for ' (deleted)' to be appended */
1530 pathname
= kmalloc(PATH_MAX
+11, ab
->gfp_mask
);
1532 audit_log_string(ab
, "<no_memory>");
1535 p
= d_path(path
, pathname
, PATH_MAX
+11);
1536 if (IS_ERR(p
)) { /* Should never happen since we send PATH_MAX */
1537 /* FIXME: can we save some information here? */
1538 audit_log_string(ab
, "<too_long>");
1540 audit_log_untrustedstring(ab
, p
);
1544 void audit_log_session_info(struct audit_buffer
*ab
)
1546 u32 sessionid
= audit_get_sessionid(current
);
1547 uid_t auid
= from_kuid(&init_user_ns
, audit_get_loginuid(current
));
1549 audit_log_format(ab
, " auid=%u ses=%u", auid
, sessionid
);
1552 void audit_log_key(struct audit_buffer
*ab
, char *key
)
1554 audit_log_format(ab
, " key=");
1556 audit_log_untrustedstring(ab
, key
);
1558 audit_log_format(ab
, "(null)");
1561 void audit_log_cap(struct audit_buffer
*ab
, char *prefix
, kernel_cap_t
*cap
)
1565 audit_log_format(ab
, " %s=", prefix
);
1566 CAP_FOR_EACH_U32(i
) {
1567 audit_log_format(ab
, "%08x",
1568 cap
->cap
[(_KERNEL_CAPABILITY_U32S
-1) - i
]);
1572 void audit_log_fcaps(struct audit_buffer
*ab
, struct audit_names
*name
)
1574 kernel_cap_t
*perm
= &name
->fcap
.permitted
;
1575 kernel_cap_t
*inh
= &name
->fcap
.inheritable
;
1578 if (!cap_isclear(*perm
)) {
1579 audit_log_cap(ab
, "cap_fp", perm
);
1582 if (!cap_isclear(*inh
)) {
1583 audit_log_cap(ab
, "cap_fi", inh
);
1588 audit_log_format(ab
, " cap_fe=%d cap_fver=%x",
1589 name
->fcap
.fE
, name
->fcap_ver
);
1592 static inline int audit_copy_fcaps(struct audit_names
*name
,
1593 const struct dentry
*dentry
)
1595 struct cpu_vfs_cap_data caps
;
1601 rc
= get_vfs_caps_from_disk(dentry
, &caps
);
1605 name
->fcap
.permitted
= caps
.permitted
;
1606 name
->fcap
.inheritable
= caps
.inheritable
;
1607 name
->fcap
.fE
= !!(caps
.magic_etc
& VFS_CAP_FLAGS_EFFECTIVE
);
1608 name
->fcap_ver
= (caps
.magic_etc
& VFS_CAP_REVISION_MASK
) >>
1609 VFS_CAP_REVISION_SHIFT
;
1614 /* Copy inode data into an audit_names. */
1615 void audit_copy_inode(struct audit_names
*name
, const struct dentry
*dentry
,
1616 const struct inode
*inode
)
1618 name
->ino
= inode
->i_ino
;
1619 name
->dev
= inode
->i_sb
->s_dev
;
1620 name
->mode
= inode
->i_mode
;
1621 name
->uid
= inode
->i_uid
;
1622 name
->gid
= inode
->i_gid
;
1623 name
->rdev
= inode
->i_rdev
;
1624 security_inode_getsecid(inode
, &name
->osid
);
1625 audit_copy_fcaps(name
, dentry
);
1629 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1630 * @context: audit_context for the task
1631 * @n: audit_names structure with reportable details
1632 * @path: optional path to report instead of audit_names->name
1633 * @record_num: record number to report when handling a list of names
1634 * @call_panic: optional pointer to int that will be updated if secid fails
1636 void audit_log_name(struct audit_context
*context
, struct audit_names
*n
,
1637 struct path
*path
, int record_num
, int *call_panic
)
1639 struct audit_buffer
*ab
;
1640 ab
= audit_log_start(context
, GFP_KERNEL
, AUDIT_PATH
);
1644 audit_log_format(ab
, "item=%d", record_num
);
1647 audit_log_d_path(ab
, " name=", path
);
1649 switch (n
->name_len
) {
1650 case AUDIT_NAME_FULL
:
1651 /* log the full path */
1652 audit_log_format(ab
, " name=");
1653 audit_log_untrustedstring(ab
, n
->name
->name
);
1656 /* name was specified as a relative path and the
1657 * directory component is the cwd */
1658 audit_log_d_path(ab
, " name=", &context
->pwd
);
1661 /* log the name's directory component */
1662 audit_log_format(ab
, " name=");
1663 audit_log_n_untrustedstring(ab
, n
->name
->name
,
1667 audit_log_format(ab
, " name=(null)");
1669 if (n
->ino
!= (unsigned long)-1) {
1670 audit_log_format(ab
, " inode=%lu"
1671 " dev=%02x:%02x mode=%#ho"
1672 " ouid=%u ogid=%u rdev=%02x:%02x",
1677 from_kuid(&init_user_ns
, n
->uid
),
1678 from_kgid(&init_user_ns
, n
->gid
),
1685 if (security_secid_to_secctx(
1686 n
->osid
, &ctx
, &len
)) {
1687 audit_log_format(ab
, " osid=%u", n
->osid
);
1691 audit_log_format(ab
, " obj=%s", ctx
);
1692 security_release_secctx(ctx
, len
);
1696 /* log the audit_names record type */
1697 audit_log_format(ab
, " nametype=");
1699 case AUDIT_TYPE_NORMAL
:
1700 audit_log_format(ab
, "NORMAL");
1702 case AUDIT_TYPE_PARENT
:
1703 audit_log_format(ab
, "PARENT");
1705 case AUDIT_TYPE_CHILD_DELETE
:
1706 audit_log_format(ab
, "DELETE");
1708 case AUDIT_TYPE_CHILD_CREATE
:
1709 audit_log_format(ab
, "CREATE");
1712 audit_log_format(ab
, "UNKNOWN");
1716 audit_log_fcaps(ab
, n
);
1720 int audit_log_task_context(struct audit_buffer
*ab
)
1727 security_task_getsecid(current
, &sid
);
1731 error
= security_secid_to_secctx(sid
, &ctx
, &len
);
1733 if (error
!= -EINVAL
)
1738 audit_log_format(ab
, " subj=%s", ctx
);
1739 security_release_secctx(ctx
, len
);
1743 audit_panic("error in audit_log_task_context");
1746 EXPORT_SYMBOL(audit_log_task_context
);
1748 void audit_log_task_info(struct audit_buffer
*ab
, struct task_struct
*tsk
)
1750 const struct cred
*cred
;
1751 char name
[sizeof(tsk
->comm
)];
1752 struct mm_struct
*mm
= tsk
->mm
;
1758 /* tsk == current */
1759 cred
= current_cred();
1761 spin_lock_irq(&tsk
->sighand
->siglock
);
1762 if (tsk
->signal
&& tsk
->signal
->tty
&& tsk
->signal
->tty
->name
)
1763 tty
= tsk
->signal
->tty
->name
;
1766 spin_unlock_irq(&tsk
->sighand
->siglock
);
1768 audit_log_format(ab
,
1769 " ppid=%ld pid=%d auid=%u uid=%u gid=%u"
1770 " euid=%u suid=%u fsuid=%u"
1771 " egid=%u sgid=%u fsgid=%u tty=%s ses=%u",
1774 from_kuid(&init_user_ns
, audit_get_loginuid(tsk
)),
1775 from_kuid(&init_user_ns
, cred
->uid
),
1776 from_kgid(&init_user_ns
, cred
->gid
),
1777 from_kuid(&init_user_ns
, cred
->euid
),
1778 from_kuid(&init_user_ns
, cred
->suid
),
1779 from_kuid(&init_user_ns
, cred
->fsuid
),
1780 from_kgid(&init_user_ns
, cred
->egid
),
1781 from_kgid(&init_user_ns
, cred
->sgid
),
1782 from_kgid(&init_user_ns
, cred
->fsgid
),
1783 tty
, audit_get_sessionid(tsk
));
1785 get_task_comm(name
, tsk
);
1786 audit_log_format(ab
, " comm=");
1787 audit_log_untrustedstring(ab
, name
);
1790 down_read(&mm
->mmap_sem
);
1792 audit_log_d_path(ab
, " exe=", &mm
->exe_file
->f_path
);
1793 up_read(&mm
->mmap_sem
);
1795 audit_log_task_context(ab
);
1797 EXPORT_SYMBOL(audit_log_task_info
);
1800 * audit_log_link_denied - report a link restriction denial
1801 * @operation: specific link opreation
1802 * @link: the path that triggered the restriction
1804 void audit_log_link_denied(const char *operation
, struct path
*link
)
1806 struct audit_buffer
*ab
;
1807 struct audit_names
*name
;
1809 name
= kzalloc(sizeof(*name
), GFP_NOFS
);
1813 /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
1814 ab
= audit_log_start(current
->audit_context
, GFP_KERNEL
,
1818 audit_log_format(ab
, "op=%s", operation
);
1819 audit_log_task_info(ab
, current
);
1820 audit_log_format(ab
, " res=0");
1823 /* Generate AUDIT_PATH record with object. */
1824 name
->type
= AUDIT_TYPE_NORMAL
;
1825 audit_copy_inode(name
, link
->dentry
, link
->dentry
->d_inode
);
1826 audit_log_name(current
->audit_context
, name
, link
, 0, NULL
);
1832 * audit_log_end - end one audit record
1833 * @ab: the audit_buffer
1835 * The netlink_* functions cannot be called inside an irq context, so
1836 * the audit buffer is placed on a queue and a tasklet is scheduled to
1837 * remove them from the queue outside the irq context. May be called in
1840 void audit_log_end(struct audit_buffer
*ab
)
1844 if (!audit_rate_check()) {
1845 audit_log_lost("rate limit exceeded");
1847 struct nlmsghdr
*nlh
= nlmsg_hdr(ab
->skb
);
1848 nlh
->nlmsg_len
= ab
->skb
->len
- NLMSG_HDRLEN
;
1851 skb_queue_tail(&audit_skb_queue
, ab
->skb
);
1852 wake_up_interruptible(&kauditd_wait
);
1854 audit_printk_skb(ab
->skb
);
1858 audit_buffer_free(ab
);
1862 * audit_log - Log an audit record
1863 * @ctx: audit context
1864 * @gfp_mask: type of allocation
1865 * @type: audit message type
1866 * @fmt: format string to use
1867 * @...: variable parameters matching the format string
1869 * This is a convenience function that calls audit_log_start,
1870 * audit_log_vformat, and audit_log_end. It may be called
1873 void audit_log(struct audit_context
*ctx
, gfp_t gfp_mask
, int type
,
1874 const char *fmt
, ...)
1876 struct audit_buffer
*ab
;
1879 ab
= audit_log_start(ctx
, gfp_mask
, type
);
1881 va_start(args
, fmt
);
1882 audit_log_vformat(ab
, fmt
, args
);
1888 #ifdef CONFIG_SECURITY
1890 * audit_log_secctx - Converts and logs SELinux context
1892 * @secid: security number
1894 * This is a helper function that calls security_secid_to_secctx to convert
1895 * secid to secctx and then adds the (converted) SELinux context to the audit
1896 * log by calling audit_log_format, thus also preventing leak of internal secid
1897 * to userspace. If secid cannot be converted audit_panic is called.
1899 void audit_log_secctx(struct audit_buffer
*ab
, u32 secid
)
1904 if (security_secid_to_secctx(secid
, &secctx
, &len
)) {
1905 audit_panic("Cannot convert secid to context");
1907 audit_log_format(ab
, " obj=%s", secctx
);
1908 security_release_secctx(secctx
, len
);
1911 EXPORT_SYMBOL(audit_log_secctx
);
1914 EXPORT_SYMBOL(audit_log_start
);
1915 EXPORT_SYMBOL(audit_log_end
);
1916 EXPORT_SYMBOL(audit_log_format
);
1917 EXPORT_SYMBOL(audit_log
);