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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
46 #include <linux/init.h>
47 #include <asm/types.h>
48 #include <linux/atomic.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>
57 #include <linux/audit.h>
60 #include <net/netlink.h>
61 #include <linux/skbuff.h>
62 #ifdef CONFIG_SECURITY
63 #include <linux/security.h>
65 #include <linux/freezer.h>
66 #include <linux/tty.h>
67 #include <linux/pid_namespace.h>
68 #include <net/netns/generic.h>
72 /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
73 * (Initialization happens after skb_init is called.) */
74 #define AUDIT_DISABLED -1
75 #define AUDIT_UNINITIALIZED 0
76 #define AUDIT_INITIALIZED 1
77 static int audit_initialized
;
81 #define AUDIT_LOCKED 2
83 u32 audit_ever_enabled
;
85 EXPORT_SYMBOL_GPL(audit_enabled
);
87 /* Default state when kernel boots without any parameters. */
88 static u32 audit_default
;
90 /* If auditing cannot proceed, audit_failure selects what happens. */
91 static u32 audit_failure
= AUDIT_FAIL_PRINTK
;
94 * If audit records are to be written to the netlink socket, audit_pid
95 * contains the pid of the auditd process and audit_nlk_portid contains
96 * the portid to use to send netlink messages to that process.
99 static __u32 audit_nlk_portid
;
101 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
102 * to that number per second. This prevents DoS attacks, but results in
103 * audit records being dropped. */
104 static u32 audit_rate_limit
;
106 /* Number of outstanding audit_buffers allowed.
107 * When set to zero, this means unlimited. */
108 static u32 audit_backlog_limit
= 64;
109 #define AUDIT_BACKLOG_WAIT_TIME (60 * HZ)
110 static u32 audit_backlog_wait_time
= AUDIT_BACKLOG_WAIT_TIME
;
111 static u32 audit_backlog_wait_overflow
= 0;
113 /* The identity of the user shutting down the audit system. */
114 kuid_t audit_sig_uid
= INVALID_UID
;
115 pid_t audit_sig_pid
= -1;
116 u32 audit_sig_sid
= 0;
118 /* Records can be lost in several ways:
119 0) [suppressed in audit_alloc]
120 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
121 2) out of memory in audit_log_move [alloc_skb]
122 3) suppressed due to audit_rate_limit
123 4) suppressed due to audit_backlog_limit
125 static atomic_t audit_lost
= ATOMIC_INIT(0);
127 /* The netlink socket. */
128 static struct sock
*audit_sock
;
131 /* Hash for inode-based rules */
132 struct list_head audit_inode_hash
[AUDIT_INODE_BUCKETS
];
134 /* The audit_freelist is a list of pre-allocated audit buffers (if more
135 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
136 * being placed on the freelist). */
137 static DEFINE_SPINLOCK(audit_freelist_lock
);
138 static int audit_freelist_count
;
139 static LIST_HEAD(audit_freelist
);
141 static struct sk_buff_head audit_skb_queue
;
142 /* queue of skbs to send to auditd when/if it comes back */
143 static struct sk_buff_head audit_skb_hold_queue
;
144 static struct task_struct
*kauditd_task
;
145 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait
);
146 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait
);
148 static struct audit_features af
= {.vers
= AUDIT_FEATURE_VERSION
,
153 static char *audit_feature_names
[2] = {
154 "only_unset_loginuid",
155 "loginuid_immutable",
159 /* Serialize requests from userspace. */
160 DEFINE_MUTEX(audit_cmd_mutex
);
162 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
163 * audit records. Since printk uses a 1024 byte buffer, this buffer
164 * should be at least that large. */
165 #define AUDIT_BUFSIZ 1024
167 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
168 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
169 #define AUDIT_MAXFREE (2*NR_CPUS)
171 /* The audit_buffer is used when formatting an audit record. The caller
172 * locks briefly to get the record off the freelist or to allocate the
173 * buffer, and locks briefly to send the buffer to the netlink layer or
174 * to place it on a transmit queue. Multiple audit_buffers can be in
175 * use simultaneously. */
176 struct audit_buffer
{
177 struct list_head list
;
178 struct sk_buff
*skb
; /* formatted skb ready to send */
179 struct audit_context
*ctx
; /* NULL or associated context */
189 static void audit_set_portid(struct audit_buffer
*ab
, __u32 portid
)
192 struct nlmsghdr
*nlh
= nlmsg_hdr(ab
->skb
);
193 nlh
->nlmsg_pid
= portid
;
197 void audit_panic(const char *message
)
199 switch (audit_failure
) {
200 case AUDIT_FAIL_SILENT
:
202 case AUDIT_FAIL_PRINTK
:
203 if (printk_ratelimit())
204 pr_err("%s\n", message
);
206 case AUDIT_FAIL_PANIC
:
207 /* test audit_pid since printk is always losey, why bother? */
209 panic("audit: %s\n", message
);
214 static inline int audit_rate_check(void)
216 static unsigned long last_check
= 0;
217 static int messages
= 0;
218 static DEFINE_SPINLOCK(lock
);
221 unsigned long elapsed
;
224 if (!audit_rate_limit
) return 1;
226 spin_lock_irqsave(&lock
, flags
);
227 if (++messages
< audit_rate_limit
) {
231 elapsed
= now
- last_check
;
238 spin_unlock_irqrestore(&lock
, flags
);
244 * audit_log_lost - conditionally log lost audit message event
245 * @message: the message stating reason for lost audit message
247 * Emit at least 1 message per second, even if audit_rate_check is
249 * Always increment the lost messages counter.
251 void audit_log_lost(const char *message
)
253 static unsigned long last_msg
= 0;
254 static DEFINE_SPINLOCK(lock
);
259 atomic_inc(&audit_lost
);
261 print
= (audit_failure
== AUDIT_FAIL_PANIC
|| !audit_rate_limit
);
264 spin_lock_irqsave(&lock
, flags
);
266 if (now
- last_msg
> HZ
) {
270 spin_unlock_irqrestore(&lock
, flags
);
274 if (printk_ratelimit())
275 pr_warn("audit_lost=%u audit_rate_limit=%u audit_backlog_limit=%u\n",
276 atomic_read(&audit_lost
),
278 audit_backlog_limit
);
279 audit_panic(message
);
283 static int audit_log_config_change(char *function_name
, u32
new, u32 old
,
286 struct audit_buffer
*ab
;
289 ab
= audit_log_start(NULL
, GFP_KERNEL
, AUDIT_CONFIG_CHANGE
);
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
);
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
, u32
*to_change
, u32
new)
304 int allow_changes
, rc
= 0;
305 u32 old
= *to_change
;
307 /* check if we are locked */
308 if (audit_enabled
== AUDIT_LOCKED
)
313 if (audit_enabled
!= AUDIT_OFF
) {
314 rc
= audit_log_config_change(function_name
, new, old
, allow_changes
);
319 /* If we are allowed, make the change */
320 if (allow_changes
== 1)
322 /* Not allowed, update reason */
328 static int audit_set_rate_limit(u32 limit
)
330 return audit_do_config_change("audit_rate_limit", &audit_rate_limit
, limit
);
333 static int audit_set_backlog_limit(u32 limit
)
335 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit
, limit
);
338 static int audit_set_backlog_wait_time(u32 timeout
)
340 return audit_do_config_change("audit_backlog_wait_time",
341 &audit_backlog_wait_time
, timeout
);
344 static int audit_set_enabled(u32 state
)
347 if (state
< AUDIT_OFF
|| state
> AUDIT_LOCKED
)
350 rc
= audit_do_config_change("audit_enabled", &audit_enabled
, state
);
352 audit_ever_enabled
|= !!state
;
357 static int audit_set_failure(u32 state
)
359 if (state
!= AUDIT_FAIL_SILENT
360 && state
!= AUDIT_FAIL_PRINTK
361 && state
!= AUDIT_FAIL_PANIC
)
364 return audit_do_config_change("audit_failure", &audit_failure
, state
);
368 * Queue skbs to be sent to auditd when/if it comes back. These skbs should
369 * already have been sent via prink/syslog and so if these messages are dropped
370 * it is not a huge concern since we already passed the audit_log_lost()
371 * notification and stuff. This is just nice to get audit messages during
372 * boot before auditd is running or messages generated while auditd is stopped.
373 * This only holds messages is audit_default is set, aka booting with audit=1
374 * or building your kernel that way.
376 static void audit_hold_skb(struct sk_buff
*skb
)
379 (!audit_backlog_limit
||
380 skb_queue_len(&audit_skb_hold_queue
) < audit_backlog_limit
))
381 skb_queue_tail(&audit_skb_hold_queue
, skb
);
387 * For one reason or another this nlh isn't getting delivered to the userspace
388 * audit daemon, just send it to printk.
390 static void audit_printk_skb(struct sk_buff
*skb
)
392 struct nlmsghdr
*nlh
= nlmsg_hdr(skb
);
393 char *data
= nlmsg_data(nlh
);
395 if (nlh
->nlmsg_type
!= AUDIT_EOE
) {
396 if (printk_ratelimit())
397 pr_notice("type=%d %s\n", nlh
->nlmsg_type
, data
);
399 audit_log_lost("printk limit exceeded\n");
405 static void kauditd_send_skb(struct sk_buff
*skb
)
408 /* take a reference in case we can't send it and we want to hold it */
410 err
= netlink_unicast(audit_sock
, skb
, audit_nlk_portid
, 0);
412 BUG_ON(err
!= -ECONNREFUSED
); /* Shouldn't happen */
414 pr_err("*NO* daemon at audit_pid=%d\n", audit_pid
);
415 audit_log_lost("auditd disappeared\n");
419 /* we might get lucky and get this in the next auditd */
422 /* drop the extra reference if sent ok */
427 * flush_hold_queue - empty the hold queue if auditd appears
429 * If auditd just started, drain the queue of messages already
430 * sent to syslog/printk. Remember loss here is ok. We already
431 * called audit_log_lost() if it didn't go out normally. so the
432 * race between the skb_dequeue and the next check for audit_pid
435 * If you ever find kauditd to be too slow we can get a perf win
436 * by doing our own locking and keeping better track if there
437 * are messages in this queue. I don't see the need now, but
438 * in 5 years when I want to play with this again I'll see this
439 * note and still have no friggin idea what i'm thinking today.
441 static void flush_hold_queue(void)
445 if (!audit_default
|| !audit_pid
)
448 skb
= skb_dequeue(&audit_skb_hold_queue
);
452 while (skb
&& audit_pid
) {
453 kauditd_send_skb(skb
);
454 skb
= skb_dequeue(&audit_skb_hold_queue
);
458 * if auditd just disappeared but we
459 * dequeued an skb we need to drop ref
465 static int kauditd_thread(void *dummy
)
468 while (!kthread_should_stop()) {
470 DECLARE_WAITQUEUE(wait
, current
);
474 skb
= skb_dequeue(&audit_skb_queue
);
477 if (skb_queue_len(&audit_skb_queue
) <= audit_backlog_limit
)
478 wake_up(&audit_backlog_wait
);
480 kauditd_send_skb(skb
);
482 audit_printk_skb(skb
);
485 set_current_state(TASK_INTERRUPTIBLE
);
486 add_wait_queue(&kauditd_wait
, &wait
);
488 if (!skb_queue_len(&audit_skb_queue
)) {
493 __set_current_state(TASK_RUNNING
);
494 remove_wait_queue(&kauditd_wait
, &wait
);
499 int audit_send_list(void *_dest
)
501 struct audit_netlink_list
*dest
= _dest
;
503 struct net
*net
= dest
->net
;
504 struct audit_net
*aunet
= net_generic(net
, audit_net_id
);
506 /* wait for parent to finish and send an ACK */
507 mutex_lock(&audit_cmd_mutex
);
508 mutex_unlock(&audit_cmd_mutex
);
510 while ((skb
= __skb_dequeue(&dest
->q
)) != NULL
)
511 netlink_unicast(aunet
->nlsk
, skb
, dest
->portid
, 0);
519 struct sk_buff
*audit_make_reply(__u32 portid
, int seq
, int type
, int done
,
520 int multi
, const void *payload
, int size
)
523 struct nlmsghdr
*nlh
;
525 int flags
= multi
? NLM_F_MULTI
: 0;
526 int t
= done
? NLMSG_DONE
: type
;
528 skb
= nlmsg_new(size
, GFP_KERNEL
);
532 nlh
= nlmsg_put(skb
, portid
, seq
, t
, size
, flags
);
535 data
= nlmsg_data(nlh
);
536 memcpy(data
, payload
, size
);
544 static int audit_send_reply_thread(void *arg
)
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
);
550 mutex_lock(&audit_cmd_mutex
);
551 mutex_unlock(&audit_cmd_mutex
);
553 /* Ignore failure. It'll only happen if the sender goes away,
554 because our timeout is set to infinite. */
555 netlink_unicast(aunet
->nlsk
, reply
->skb
, reply
->portid
, 0);
561 * audit_send_reply - send an audit reply message via netlink
562 * @portid: netlink port to which to send reply
563 * @seq: sequence number
564 * @type: audit message type
565 * @done: done (last) flag
566 * @multi: multi-part message flag
567 * @payload: payload data
568 * @size: payload size
570 * Allocates an skb, builds the netlink message, and sends it to the port id.
571 * No failure notifications.
573 static void audit_send_reply(__u32 portid
, int seq
, int type
, int done
,
574 int multi
, const void *payload
, int size
)
577 struct task_struct
*tsk
;
578 struct audit_reply
*reply
= kmalloc(sizeof(struct audit_reply
),
584 skb
= audit_make_reply(portid
, seq
, type
, done
, multi
, payload
, size
);
588 reply
->net
= get_net(current
->nsproxy
->net_ns
);
589 reply
->portid
= portid
;
592 tsk
= kthread_run(audit_send_reply_thread
, reply
, "audit_send_reply");
601 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
604 static int audit_netlink_ok(struct sk_buff
*skb
, u16 msg_type
)
608 /* Only support the initial namespaces for now. */
609 if ((current_user_ns() != &init_user_ns
) ||
610 (task_active_pid_ns(current
) != &init_pid_ns
))
620 case AUDIT_GET_FEATURE
:
621 case AUDIT_SET_FEATURE
:
622 case AUDIT_LIST_RULES
:
625 case AUDIT_SIGNAL_INFO
:
629 case AUDIT_MAKE_EQUIV
:
630 if (!capable(CAP_AUDIT_CONTROL
))
634 case AUDIT_FIRST_USER_MSG
... AUDIT_LAST_USER_MSG
:
635 case AUDIT_FIRST_USER_MSG2
... AUDIT_LAST_USER_MSG2
:
636 if (!capable(CAP_AUDIT_WRITE
))
639 default: /* bad msg */
646 static int audit_log_common_recv_msg(struct audit_buffer
**ab
, u16 msg_type
)
649 uid_t uid
= from_kuid(&init_user_ns
, current_uid());
651 if (!audit_enabled
&& msg_type
!= AUDIT_USER_AVC
) {
656 *ab
= audit_log_start(NULL
, GFP_KERNEL
, msg_type
);
659 audit_log_format(*ab
, "pid=%d uid=%u", task_tgid_vnr(current
), uid
);
660 audit_log_session_info(*ab
);
661 audit_log_task_context(*ab
);
666 int is_audit_feature_set(int i
)
668 return af
.features
& AUDIT_FEATURE_TO_MASK(i
);
672 static int audit_get_feature(struct sk_buff
*skb
)
676 seq
= nlmsg_hdr(skb
)->nlmsg_seq
;
678 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_GET
, 0, 0,
684 static void audit_log_feature_change(int which
, u32 old_feature
, u32 new_feature
,
685 u32 old_lock
, u32 new_lock
, int res
)
687 struct audit_buffer
*ab
;
689 if (audit_enabled
== AUDIT_OFF
)
692 ab
= audit_log_start(NULL
, GFP_KERNEL
, AUDIT_FEATURE_CHANGE
);
693 audit_log_task_info(ab
, current
);
694 audit_log_format(ab
, "feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d",
695 audit_feature_names
[which
], !!old_feature
, !!new_feature
,
696 !!old_lock
, !!new_lock
, res
);
700 static int audit_set_feature(struct sk_buff
*skb
)
702 struct audit_features
*uaf
;
705 BUILD_BUG_ON(AUDIT_LAST_FEATURE
+ 1 > sizeof(audit_feature_names
)/sizeof(audit_feature_names
[0]));
706 uaf
= nlmsg_data(nlmsg_hdr(skb
));
708 /* if there is ever a version 2 we should handle that here */
710 for (i
= 0; i
<= AUDIT_LAST_FEATURE
; i
++) {
711 u32 feature
= AUDIT_FEATURE_TO_MASK(i
);
712 u32 old_feature
, new_feature
, old_lock
, new_lock
;
714 /* if we are not changing this feature, move along */
715 if (!(feature
& uaf
->mask
))
718 old_feature
= af
.features
& feature
;
719 new_feature
= uaf
->features
& feature
;
720 new_lock
= (uaf
->lock
| af
.lock
) & feature
;
721 old_lock
= af
.lock
& feature
;
723 /* are we changing a locked feature? */
724 if (old_lock
&& (new_feature
!= old_feature
)) {
725 audit_log_feature_change(i
, old_feature
, new_feature
,
726 old_lock
, new_lock
, 0);
730 /* nothing invalid, do the changes */
731 for (i
= 0; i
<= AUDIT_LAST_FEATURE
; i
++) {
732 u32 feature
= AUDIT_FEATURE_TO_MASK(i
);
733 u32 old_feature
, new_feature
, old_lock
, new_lock
;
735 /* if we are not changing this feature, move along */
736 if (!(feature
& uaf
->mask
))
739 old_feature
= af
.features
& feature
;
740 new_feature
= uaf
->features
& feature
;
741 old_lock
= af
.lock
& feature
;
742 new_lock
= (uaf
->lock
| af
.lock
) & feature
;
744 if (new_feature
!= old_feature
)
745 audit_log_feature_change(i
, old_feature
, new_feature
,
746 old_lock
, new_lock
, 1);
749 af
.features
|= feature
;
751 af
.features
&= ~feature
;
758 static int audit_receive_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
763 struct audit_buffer
*ab
;
764 u16 msg_type
= nlh
->nlmsg_type
;
765 struct audit_sig_info
*sig_data
;
769 err
= audit_netlink_ok(skb
, msg_type
);
773 /* As soon as there's any sign of userspace auditd,
774 * start kauditd to talk to it */
776 kauditd_task
= kthread_run(kauditd_thread
, NULL
, "kauditd");
777 if (IS_ERR(kauditd_task
)) {
778 err
= PTR_ERR(kauditd_task
);
783 seq
= nlh
->nlmsg_seq
;
784 data
= nlmsg_data(nlh
);
788 struct audit_status s
;
789 memset(&s
, 0, sizeof(s
));
790 s
.enabled
= audit_enabled
;
791 s
.failure
= audit_failure
;
793 s
.rate_limit
= audit_rate_limit
;
794 s
.backlog_limit
= audit_backlog_limit
;
795 s
.lost
= atomic_read(&audit_lost
);
796 s
.backlog
= skb_queue_len(&audit_skb_queue
);
797 s
.version
= AUDIT_VERSION_LATEST
;
798 s
.backlog_wait_time
= audit_backlog_wait_time
;
799 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_GET
, 0, 0,
804 struct audit_status s
;
805 memset(&s
, 0, sizeof(s
));
806 /* guard against past and future API changes */
807 memcpy(&s
, data
, min_t(size_t, sizeof(s
), nlmsg_len(nlh
)));
808 if (s
.mask
& AUDIT_STATUS_ENABLED
) {
809 err
= audit_set_enabled(s
.enabled
);
813 if (s
.mask
& AUDIT_STATUS_FAILURE
) {
814 err
= audit_set_failure(s
.failure
);
818 if (s
.mask
& AUDIT_STATUS_PID
) {
821 if ((!new_pid
) && (task_tgid_vnr(current
) != audit_pid
))
823 if (audit_enabled
!= AUDIT_OFF
)
824 audit_log_config_change("audit_pid", new_pid
, audit_pid
, 1);
826 audit_nlk_portid
= NETLINK_CB(skb
).portid
;
827 audit_sock
= skb
->sk
;
829 if (s
.mask
& AUDIT_STATUS_RATE_LIMIT
) {
830 err
= audit_set_rate_limit(s
.rate_limit
);
834 if (s
.mask
& AUDIT_STATUS_BACKLOG_LIMIT
) {
835 err
= audit_set_backlog_limit(s
.backlog_limit
);
839 if (s
.mask
& AUDIT_STATUS_BACKLOG_WAIT_TIME
) {
840 if (sizeof(s
) > (size_t)nlh
->nlmsg_len
)
842 if (s
.backlog_wait_time
< 0 ||
843 s
.backlog_wait_time
> 10*AUDIT_BACKLOG_WAIT_TIME
)
845 err
= audit_set_backlog_wait_time(s
.backlog_wait_time
);
851 case AUDIT_GET_FEATURE
:
852 err
= audit_get_feature(skb
);
856 case AUDIT_SET_FEATURE
:
857 err
= audit_set_feature(skb
);
862 case AUDIT_FIRST_USER_MSG
... AUDIT_LAST_USER_MSG
:
863 case AUDIT_FIRST_USER_MSG2
... AUDIT_LAST_USER_MSG2
:
864 if (!audit_enabled
&& msg_type
!= AUDIT_USER_AVC
)
867 err
= audit_filter_user(msg_type
);
868 if (err
== 1) { /* match or error */
870 if (msg_type
== AUDIT_USER_TTY
) {
871 err
= tty_audit_push_current();
875 mutex_unlock(&audit_cmd_mutex
);
876 audit_log_common_recv_msg(&ab
, msg_type
);
877 if (msg_type
!= AUDIT_USER_TTY
)
878 audit_log_format(ab
, " msg='%.*s'",
879 AUDIT_MESSAGE_TEXT_MAX
,
884 audit_log_format(ab
, " data=");
885 size
= nlmsg_len(nlh
);
887 ((unsigned char *)data
)[size
- 1] == '\0')
889 audit_log_n_untrustedstring(ab
, data
, size
);
891 audit_set_portid(ab
, NETLINK_CB(skb
).portid
);
893 mutex_lock(&audit_cmd_mutex
);
898 if (nlmsg_len(nlh
) < sizeof(struct audit_rule_data
))
900 if (audit_enabled
== AUDIT_LOCKED
) {
901 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
902 audit_log_format(ab
, " audit_enabled=%d res=0", audit_enabled
);
906 err
= audit_rule_change(msg_type
, NETLINK_CB(skb
).portid
,
907 seq
, data
, nlmsg_len(nlh
));
909 case AUDIT_LIST_RULES
:
910 err
= audit_list_rules_send(NETLINK_CB(skb
).portid
, seq
);
914 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
915 audit_log_format(ab
, " op=trim res=1");
918 case AUDIT_MAKE_EQUIV
: {
921 size_t msglen
= nlmsg_len(nlh
);
925 if (msglen
< 2 * sizeof(u32
))
927 memcpy(sizes
, bufp
, 2 * sizeof(u32
));
928 bufp
+= 2 * sizeof(u32
);
929 msglen
-= 2 * sizeof(u32
);
930 old
= audit_unpack_string(&bufp
, &msglen
, sizes
[0]);
935 new = audit_unpack_string(&bufp
, &msglen
, sizes
[1]);
941 /* OK, here comes... */
942 err
= audit_tag_tree(old
, new);
944 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
946 audit_log_format(ab
, " op=make_equiv old=");
947 audit_log_untrustedstring(ab
, old
);
948 audit_log_format(ab
, " new=");
949 audit_log_untrustedstring(ab
, new);
950 audit_log_format(ab
, " res=%d", !err
);
956 case AUDIT_SIGNAL_INFO
:
959 err
= security_secid_to_secctx(audit_sig_sid
, &ctx
, &len
);
963 sig_data
= kmalloc(sizeof(*sig_data
) + len
, GFP_KERNEL
);
966 security_release_secctx(ctx
, len
);
969 sig_data
->uid
= from_kuid(&init_user_ns
, audit_sig_uid
);
970 sig_data
->pid
= audit_sig_pid
;
972 memcpy(sig_data
->ctx
, ctx
, len
);
973 security_release_secctx(ctx
, len
);
975 audit_send_reply(NETLINK_CB(skb
).portid
, seq
, AUDIT_SIGNAL_INFO
,
976 0, 0, sig_data
, sizeof(*sig_data
) + len
);
979 case AUDIT_TTY_GET
: {
980 struct audit_tty_status s
;
981 struct task_struct
*tsk
= current
;
983 spin_lock(&tsk
->sighand
->siglock
);
984 s
.enabled
= tsk
->signal
->audit_tty
;
985 s
.log_passwd
= tsk
->signal
->audit_tty_log_passwd
;
986 spin_unlock(&tsk
->sighand
->siglock
);
988 audit_send_reply(NETLINK_CB(skb
).portid
, seq
,
989 AUDIT_TTY_GET
, 0, 0, &s
, sizeof(s
));
992 case AUDIT_TTY_SET
: {
993 struct audit_tty_status s
, old
;
994 struct task_struct
*tsk
= current
;
995 struct audit_buffer
*ab
;
997 memset(&s
, 0, sizeof(s
));
998 /* guard against past and future API changes */
999 memcpy(&s
, data
, min_t(size_t, sizeof(s
), nlmsg_len(nlh
)));
1000 /* check if new data is valid */
1001 if ((s
.enabled
!= 0 && s
.enabled
!= 1) ||
1002 (s
.log_passwd
!= 0 && s
.log_passwd
!= 1))
1005 spin_lock(&tsk
->sighand
->siglock
);
1006 old
.enabled
= tsk
->signal
->audit_tty
;
1007 old
.log_passwd
= tsk
->signal
->audit_tty_log_passwd
;
1009 tsk
->signal
->audit_tty
= s
.enabled
;
1010 tsk
->signal
->audit_tty_log_passwd
= s
.log_passwd
;
1012 spin_unlock(&tsk
->sighand
->siglock
);
1014 audit_log_common_recv_msg(&ab
, AUDIT_CONFIG_CHANGE
);
1015 audit_log_format(ab
, " op=tty_set old-enabled=%d new-enabled=%d"
1016 " old-log_passwd=%d new-log_passwd=%d res=%d",
1017 old
.enabled
, s
.enabled
, old
.log_passwd
,
1018 s
.log_passwd
, !err
);
1027 return err
< 0 ? err
: 0;
1031 * Get message from skb. Each message is processed by audit_receive_msg.
1032 * Malformed skbs with wrong length are discarded silently.
1034 static void audit_receive_skb(struct sk_buff
*skb
)
1036 struct nlmsghdr
*nlh
;
1038 * len MUST be signed for nlmsg_next to be able to dec it below 0
1039 * if the nlmsg_len was not aligned
1044 nlh
= nlmsg_hdr(skb
);
1047 while (nlmsg_ok(nlh
, len
)) {
1048 err
= audit_receive_msg(skb
, nlh
);
1049 /* if err or if this message says it wants a response */
1050 if (err
|| (nlh
->nlmsg_flags
& NLM_F_ACK
))
1051 netlink_ack(skb
, nlh
, err
);
1053 nlh
= nlmsg_next(nlh
, &len
);
1057 /* Receive messages from netlink socket. */
1058 static void audit_receive(struct sk_buff
*skb
)
1060 mutex_lock(&audit_cmd_mutex
);
1061 audit_receive_skb(skb
);
1062 mutex_unlock(&audit_cmd_mutex
);
1065 static int __net_init
audit_net_init(struct net
*net
)
1067 struct netlink_kernel_cfg cfg
= {
1068 .input
= audit_receive
,
1071 struct audit_net
*aunet
= net_generic(net
, audit_net_id
);
1073 aunet
->nlsk
= netlink_kernel_create(net
, NETLINK_AUDIT
, &cfg
);
1074 if (aunet
->nlsk
== NULL
) {
1075 audit_panic("cannot initialize netlink socket in namespace");
1078 aunet
->nlsk
->sk_sndtimeo
= MAX_SCHEDULE_TIMEOUT
;
1082 static void __net_exit
audit_net_exit(struct net
*net
)
1084 struct audit_net
*aunet
= net_generic(net
, audit_net_id
);
1085 struct sock
*sock
= aunet
->nlsk
;
1086 if (sock
== audit_sock
) {
1091 rcu_assign_pointer(aunet
->nlsk
, NULL
);
1093 netlink_kernel_release(sock
);
1096 static struct pernet_operations audit_net_ops __net_initdata
= {
1097 .init
= audit_net_init
,
1098 .exit
= audit_net_exit
,
1099 .id
= &audit_net_id
,
1100 .size
= sizeof(struct audit_net
),
1103 /* Initialize audit support at boot time. */
1104 static int __init
audit_init(void)
1108 if (audit_initialized
== AUDIT_DISABLED
)
1111 pr_info("initializing netlink subsys (%s)\n",
1112 audit_default
? "enabled" : "disabled");
1113 register_pernet_subsys(&audit_net_ops
);
1115 skb_queue_head_init(&audit_skb_queue
);
1116 skb_queue_head_init(&audit_skb_hold_queue
);
1117 audit_initialized
= AUDIT_INITIALIZED
;
1118 audit_enabled
= audit_default
;
1119 audit_ever_enabled
|= !!audit_default
;
1121 audit_log(NULL
, GFP_KERNEL
, AUDIT_KERNEL
, "initialized");
1123 for (i
= 0; i
< AUDIT_INODE_BUCKETS
; i
++)
1124 INIT_LIST_HEAD(&audit_inode_hash
[i
]);
1128 __initcall(audit_init
);
1130 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
1131 static int __init
audit_enable(char *str
)
1133 audit_default
= !!simple_strtol(str
, NULL
, 0);
1135 audit_initialized
= AUDIT_DISABLED
;
1137 pr_info("%s\n", audit_default
?
1138 "enabled (after initialization)" : "disabled (until reboot)");
1142 __setup("audit=", audit_enable
);
1144 /* Process kernel command-line parameter at boot time.
1145 * audit_backlog_limit=<n> */
1146 static int __init
audit_backlog_limit_set(char *str
)
1148 u32 audit_backlog_limit_arg
;
1150 pr_info("audit_backlog_limit: ");
1151 if (kstrtouint(str
, 0, &audit_backlog_limit_arg
)) {
1152 pr_cont("using default of %u, unable to parse %s\n",
1153 audit_backlog_limit
, str
);
1157 audit_backlog_limit
= audit_backlog_limit_arg
;
1158 pr_cont("%d\n", audit_backlog_limit
);
1162 __setup("audit_backlog_limit=", audit_backlog_limit_set
);
1164 static void audit_buffer_free(struct audit_buffer
*ab
)
1166 unsigned long flags
;
1174 spin_lock_irqsave(&audit_freelist_lock
, flags
);
1175 if (audit_freelist_count
> AUDIT_MAXFREE
)
1178 audit_freelist_count
++;
1179 list_add(&ab
->list
, &audit_freelist
);
1181 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
1184 static struct audit_buffer
* audit_buffer_alloc(struct audit_context
*ctx
,
1185 gfp_t gfp_mask
, int type
)
1187 unsigned long flags
;
1188 struct audit_buffer
*ab
= NULL
;
1189 struct nlmsghdr
*nlh
;
1191 spin_lock_irqsave(&audit_freelist_lock
, flags
);
1192 if (!list_empty(&audit_freelist
)) {
1193 ab
= list_entry(audit_freelist
.next
,
1194 struct audit_buffer
, list
);
1195 list_del(&ab
->list
);
1196 --audit_freelist_count
;
1198 spin_unlock_irqrestore(&audit_freelist_lock
, flags
);
1201 ab
= kmalloc(sizeof(*ab
), gfp_mask
);
1207 ab
->gfp_mask
= gfp_mask
;
1209 ab
->skb
= nlmsg_new(AUDIT_BUFSIZ
, gfp_mask
);
1213 nlh
= nlmsg_put(ab
->skb
, 0, 0, type
, 0, 0);
1223 audit_buffer_free(ab
);
1228 * audit_serial - compute a serial number for the audit record
1230 * Compute a serial number for the audit record. Audit records are
1231 * written to user-space as soon as they are generated, so a complete
1232 * audit record may be written in several pieces. The timestamp of the
1233 * record and this serial number are used by the user-space tools to
1234 * determine which pieces belong to the same audit record. The
1235 * (timestamp,serial) tuple is unique for each syscall and is live from
1236 * syscall entry to syscall exit.
1238 * NOTE: Another possibility is to store the formatted records off the
1239 * audit context (for those records that have a context), and emit them
1240 * all at syscall exit. However, this could delay the reporting of
1241 * significant errors until syscall exit (or never, if the system
1244 unsigned int audit_serial(void)
1246 static DEFINE_SPINLOCK(serial_lock
);
1247 static unsigned int serial
= 0;
1249 unsigned long flags
;
1252 spin_lock_irqsave(&serial_lock
, flags
);
1255 } while (unlikely(!ret
));
1256 spin_unlock_irqrestore(&serial_lock
, flags
);
1261 static inline void audit_get_stamp(struct audit_context
*ctx
,
1262 struct timespec
*t
, unsigned int *serial
)
1264 if (!ctx
|| !auditsc_get_stamp(ctx
, t
, serial
)) {
1266 *serial
= audit_serial();
1271 * Wait for auditd to drain the queue a little
1273 static long wait_for_auditd(long sleep_time
)
1275 DECLARE_WAITQUEUE(wait
, current
);
1276 set_current_state(TASK_UNINTERRUPTIBLE
);
1277 add_wait_queue_exclusive(&audit_backlog_wait
, &wait
);
1279 if (audit_backlog_limit
&&
1280 skb_queue_len(&audit_skb_queue
) > audit_backlog_limit
)
1281 sleep_time
= schedule_timeout(sleep_time
);
1283 __set_current_state(TASK_RUNNING
);
1284 remove_wait_queue(&audit_backlog_wait
, &wait
);
1290 * audit_log_start - obtain an audit buffer
1291 * @ctx: audit_context (may be NULL)
1292 * @gfp_mask: type of allocation
1293 * @type: audit message type
1295 * Returns audit_buffer pointer on success or NULL on error.
1297 * Obtain an audit buffer. This routine does locking to obtain the
1298 * audit buffer, but then no locking is required for calls to
1299 * audit_log_*format. If the task (ctx) is a task that is currently in a
1300 * syscall, then the syscall is marked as auditable and an audit record
1301 * will be written at syscall exit. If there is no associated task, then
1302 * task context (ctx) should be NULL.
1304 struct audit_buffer
*audit_log_start(struct audit_context
*ctx
, gfp_t gfp_mask
,
1307 struct audit_buffer
*ab
= NULL
;
1309 unsigned int uninitialized_var(serial
);
1310 int reserve
= 5; /* Allow atomic callers to go up to five
1311 entries over the normal backlog limit */
1312 unsigned long timeout_start
= jiffies
;
1314 if (audit_initialized
!= AUDIT_INITIALIZED
)
1317 if (unlikely(audit_filter_type(type
)))
1320 if (gfp_mask
& __GFP_WAIT
) {
1321 if (audit_pid
&& audit_pid
== current
->pid
)
1322 gfp_mask
&= ~__GFP_WAIT
;
1327 while (audit_backlog_limit
1328 && skb_queue_len(&audit_skb_queue
) > audit_backlog_limit
+ reserve
) {
1329 if (gfp_mask
& __GFP_WAIT
&& audit_backlog_wait_time
) {
1332 sleep_time
= timeout_start
+ audit_backlog_wait_time
- jiffies
;
1333 if (sleep_time
> 0) {
1334 sleep_time
= wait_for_auditd(sleep_time
);
1339 if (audit_rate_check() && printk_ratelimit())
1340 pr_warn("audit_backlog=%d > audit_backlog_limit=%d\n",
1341 skb_queue_len(&audit_skb_queue
),
1342 audit_backlog_limit
);
1343 audit_log_lost("backlog limit exceeded");
1344 audit_backlog_wait_time
= audit_backlog_wait_overflow
;
1345 wake_up(&audit_backlog_wait
);
1349 audit_backlog_wait_time
= AUDIT_BACKLOG_WAIT_TIME
;
1351 ab
= audit_buffer_alloc(ctx
, gfp_mask
, type
);
1353 audit_log_lost("out of memory in audit_log_start");
1357 audit_get_stamp(ab
->ctx
, &t
, &serial
);
1359 audit_log_format(ab
, "audit(%lu.%03lu:%u): ",
1360 t
.tv_sec
, t
.tv_nsec
/1000000, serial
);
1365 * audit_expand - expand skb in the audit buffer
1367 * @extra: space to add at tail of the skb
1369 * Returns 0 (no space) on failed expansion, or available space if
1372 static inline int audit_expand(struct audit_buffer
*ab
, int extra
)
1374 struct sk_buff
*skb
= ab
->skb
;
1375 int oldtail
= skb_tailroom(skb
);
1376 int ret
= pskb_expand_head(skb
, 0, extra
, ab
->gfp_mask
);
1377 int newtail
= skb_tailroom(skb
);
1380 audit_log_lost("out of memory in audit_expand");
1384 skb
->truesize
+= newtail
- oldtail
;
1389 * Format an audit message into the audit buffer. If there isn't enough
1390 * room in the audit buffer, more room will be allocated and vsnprint
1391 * will be called a second time. Currently, we assume that a printk
1392 * can't format message larger than 1024 bytes, so we don't either.
1394 static void audit_log_vformat(struct audit_buffer
*ab
, const char *fmt
,
1398 struct sk_buff
*skb
;
1406 avail
= skb_tailroom(skb
);
1408 avail
= audit_expand(ab
, AUDIT_BUFSIZ
);
1412 va_copy(args2
, args
);
1413 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args
);
1415 /* The printk buffer is 1024 bytes long, so if we get
1416 * here and AUDIT_BUFSIZ is at least 1024, then we can
1417 * log everything that printk could have logged. */
1418 avail
= audit_expand(ab
,
1419 max_t(unsigned, AUDIT_BUFSIZ
, 1+len
-avail
));
1422 len
= vsnprintf(skb_tail_pointer(skb
), avail
, fmt
, args2
);
1433 * audit_log_format - format a message into the audit buffer.
1435 * @fmt: format string
1436 * @...: optional parameters matching @fmt string
1438 * All the work is done in audit_log_vformat.
1440 void audit_log_format(struct audit_buffer
*ab
, const char *fmt
, ...)
1446 va_start(args
, fmt
);
1447 audit_log_vformat(ab
, fmt
, args
);
1452 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1453 * @ab: the audit_buffer
1454 * @buf: buffer to convert to hex
1455 * @len: length of @buf to be converted
1457 * No return value; failure to expand is silently ignored.
1459 * This function will take the passed buf and convert it into a string of
1460 * ascii hex digits. The new string is placed onto the skb.
1462 void audit_log_n_hex(struct audit_buffer
*ab
, const unsigned char *buf
,
1465 int i
, avail
, new_len
;
1467 struct sk_buff
*skb
;
1474 avail
= skb_tailroom(skb
);
1476 if (new_len
>= avail
) {
1477 /* Round the buffer request up to the next multiple */
1478 new_len
= AUDIT_BUFSIZ
*(((new_len
-avail
)/AUDIT_BUFSIZ
) + 1);
1479 avail
= audit_expand(ab
, new_len
);
1484 ptr
= skb_tail_pointer(skb
);
1485 for (i
= 0; i
< len
; i
++)
1486 ptr
= hex_byte_pack_upper(ptr
, buf
[i
]);
1488 skb_put(skb
, len
<< 1); /* new string is twice the old string */
1492 * Format a string of no more than slen characters into the audit buffer,
1493 * enclosed in quote marks.
1495 void audit_log_n_string(struct audit_buffer
*ab
, const char *string
,
1500 struct sk_buff
*skb
;
1507 avail
= skb_tailroom(skb
);
1508 new_len
= slen
+ 3; /* enclosing quotes + null terminator */
1509 if (new_len
> avail
) {
1510 avail
= audit_expand(ab
, new_len
);
1514 ptr
= skb_tail_pointer(skb
);
1516 memcpy(ptr
, string
, slen
);
1520 skb_put(skb
, slen
+ 2); /* don't include null terminator */
1524 * audit_string_contains_control - does a string need to be logged in hex
1525 * @string: string to be checked
1526 * @len: max length of the string to check
1528 int audit_string_contains_control(const char *string
, size_t len
)
1530 const unsigned char *p
;
1531 for (p
= string
; p
< (const unsigned char *)string
+ len
; p
++) {
1532 if (*p
== '"' || *p
< 0x21 || *p
> 0x7e)
1539 * audit_log_n_untrustedstring - log a string that may contain random characters
1541 * @len: length of string (not including trailing null)
1542 * @string: string to be logged
1544 * This code will escape a string that is passed to it if the string
1545 * contains a control character, unprintable character, double quote mark,
1546 * or a space. Unescaped strings will start and end with a double quote mark.
1547 * Strings that are escaped are printed in hex (2 digits per char).
1549 * The caller specifies the number of characters in the string to log, which may
1550 * or may not be the entire string.
1552 void audit_log_n_untrustedstring(struct audit_buffer
*ab
, const char *string
,
1555 if (audit_string_contains_control(string
, len
))
1556 audit_log_n_hex(ab
, string
, len
);
1558 audit_log_n_string(ab
, string
, len
);
1562 * audit_log_untrustedstring - log a string that may contain random characters
1564 * @string: string to be logged
1566 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1567 * determine string length.
1569 void audit_log_untrustedstring(struct audit_buffer
*ab
, const char *string
)
1571 audit_log_n_untrustedstring(ab
, string
, strlen(string
));
1574 /* This is a helper-function to print the escaped d_path */
1575 void audit_log_d_path(struct audit_buffer
*ab
, const char *prefix
,
1576 const struct path
*path
)
1581 audit_log_format(ab
, "%s", prefix
);
1583 /* We will allow 11 spaces for ' (deleted)' to be appended */
1584 pathname
= kmalloc(PATH_MAX
+11, ab
->gfp_mask
);
1586 audit_log_string(ab
, "<no_memory>");
1589 p
= d_path(path
, pathname
, PATH_MAX
+11);
1590 if (IS_ERR(p
)) { /* Should never happen since we send PATH_MAX */
1591 /* FIXME: can we save some information here? */
1592 audit_log_string(ab
, "<too_long>");
1594 audit_log_untrustedstring(ab
, p
);
1598 void audit_log_session_info(struct audit_buffer
*ab
)
1600 unsigned int sessionid
= audit_get_sessionid(current
);
1601 uid_t auid
= from_kuid(&init_user_ns
, audit_get_loginuid(current
));
1603 audit_log_format(ab
, " auid=%u ses=%u", auid
, sessionid
);
1606 void audit_log_key(struct audit_buffer
*ab
, char *key
)
1608 audit_log_format(ab
, " key=");
1610 audit_log_untrustedstring(ab
, key
);
1612 audit_log_format(ab
, "(null)");
1615 void audit_log_cap(struct audit_buffer
*ab
, char *prefix
, kernel_cap_t
*cap
)
1619 audit_log_format(ab
, " %s=", prefix
);
1620 CAP_FOR_EACH_U32(i
) {
1621 audit_log_format(ab
, "%08x",
1622 cap
->cap
[(_KERNEL_CAPABILITY_U32S
-1) - i
]);
1626 void audit_log_fcaps(struct audit_buffer
*ab
, struct audit_names
*name
)
1628 kernel_cap_t
*perm
= &name
->fcap
.permitted
;
1629 kernel_cap_t
*inh
= &name
->fcap
.inheritable
;
1632 if (!cap_isclear(*perm
)) {
1633 audit_log_cap(ab
, "cap_fp", perm
);
1636 if (!cap_isclear(*inh
)) {
1637 audit_log_cap(ab
, "cap_fi", inh
);
1642 audit_log_format(ab
, " cap_fe=%d cap_fver=%x",
1643 name
->fcap
.fE
, name
->fcap_ver
);
1646 static inline int audit_copy_fcaps(struct audit_names
*name
,
1647 const struct dentry
*dentry
)
1649 struct cpu_vfs_cap_data caps
;
1655 rc
= get_vfs_caps_from_disk(dentry
, &caps
);
1659 name
->fcap
.permitted
= caps
.permitted
;
1660 name
->fcap
.inheritable
= caps
.inheritable
;
1661 name
->fcap
.fE
= !!(caps
.magic_etc
& VFS_CAP_FLAGS_EFFECTIVE
);
1662 name
->fcap_ver
= (caps
.magic_etc
& VFS_CAP_REVISION_MASK
) >>
1663 VFS_CAP_REVISION_SHIFT
;
1668 /* Copy inode data into an audit_names. */
1669 void audit_copy_inode(struct audit_names
*name
, const struct dentry
*dentry
,
1670 const struct inode
*inode
)
1672 name
->ino
= inode
->i_ino
;
1673 name
->dev
= inode
->i_sb
->s_dev
;
1674 name
->mode
= inode
->i_mode
;
1675 name
->uid
= inode
->i_uid
;
1676 name
->gid
= inode
->i_gid
;
1677 name
->rdev
= inode
->i_rdev
;
1678 security_inode_getsecid(inode
, &name
->osid
);
1679 audit_copy_fcaps(name
, dentry
);
1683 * audit_log_name - produce AUDIT_PATH record from struct audit_names
1684 * @context: audit_context for the task
1685 * @n: audit_names structure with reportable details
1686 * @path: optional path to report instead of audit_names->name
1687 * @record_num: record number to report when handling a list of names
1688 * @call_panic: optional pointer to int that will be updated if secid fails
1690 void audit_log_name(struct audit_context
*context
, struct audit_names
*n
,
1691 struct path
*path
, int record_num
, int *call_panic
)
1693 struct audit_buffer
*ab
;
1694 ab
= audit_log_start(context
, GFP_KERNEL
, AUDIT_PATH
);
1698 audit_log_format(ab
, "item=%d", record_num
);
1701 audit_log_d_path(ab
, " name=", path
);
1703 switch (n
->name_len
) {
1704 case AUDIT_NAME_FULL
:
1705 /* log the full path */
1706 audit_log_format(ab
, " name=");
1707 audit_log_untrustedstring(ab
, n
->name
->name
);
1710 /* name was specified as a relative path and the
1711 * directory component is the cwd */
1712 audit_log_d_path(ab
, " name=", &context
->pwd
);
1715 /* log the name's directory component */
1716 audit_log_format(ab
, " name=");
1717 audit_log_n_untrustedstring(ab
, n
->name
->name
,
1721 audit_log_format(ab
, " name=(null)");
1723 if (n
->ino
!= (unsigned long)-1) {
1724 audit_log_format(ab
, " inode=%lu"
1725 " dev=%02x:%02x mode=%#ho"
1726 " ouid=%u ogid=%u rdev=%02x:%02x",
1731 from_kuid(&init_user_ns
, n
->uid
),
1732 from_kgid(&init_user_ns
, n
->gid
),
1739 if (security_secid_to_secctx(
1740 n
->osid
, &ctx
, &len
)) {
1741 audit_log_format(ab
, " osid=%u", n
->osid
);
1745 audit_log_format(ab
, " obj=%s", ctx
);
1746 security_release_secctx(ctx
, len
);
1750 /* log the audit_names record type */
1751 audit_log_format(ab
, " nametype=");
1753 case AUDIT_TYPE_NORMAL
:
1754 audit_log_format(ab
, "NORMAL");
1756 case AUDIT_TYPE_PARENT
:
1757 audit_log_format(ab
, "PARENT");
1759 case AUDIT_TYPE_CHILD_DELETE
:
1760 audit_log_format(ab
, "DELETE");
1762 case AUDIT_TYPE_CHILD_CREATE
:
1763 audit_log_format(ab
, "CREATE");
1766 audit_log_format(ab
, "UNKNOWN");
1770 audit_log_fcaps(ab
, n
);
1774 int audit_log_task_context(struct audit_buffer
*ab
)
1781 security_task_getsecid(current
, &sid
);
1785 error
= security_secid_to_secctx(sid
, &ctx
, &len
);
1787 if (error
!= -EINVAL
)
1792 audit_log_format(ab
, " subj=%s", ctx
);
1793 security_release_secctx(ctx
, len
);
1797 audit_panic("error in audit_log_task_context");
1800 EXPORT_SYMBOL(audit_log_task_context
);
1802 void audit_log_task_info(struct audit_buffer
*ab
, struct task_struct
*tsk
)
1804 const struct cred
*cred
;
1805 char name
[sizeof(tsk
->comm
)];
1806 struct mm_struct
*mm
= tsk
->mm
;
1812 /* tsk == current */
1813 cred
= current_cred();
1815 spin_lock_irq(&tsk
->sighand
->siglock
);
1816 if (tsk
->signal
&& tsk
->signal
->tty
&& tsk
->signal
->tty
->name
)
1817 tty
= tsk
->signal
->tty
->name
;
1820 spin_unlock_irq(&tsk
->sighand
->siglock
);
1822 audit_log_format(ab
,
1823 " ppid=%ld pid=%d auid=%u uid=%u gid=%u"
1824 " euid=%u suid=%u fsuid=%u"
1825 " egid=%u sgid=%u fsgid=%u tty=%s ses=%u",
1828 from_kuid(&init_user_ns
, audit_get_loginuid(tsk
)),
1829 from_kuid(&init_user_ns
, cred
->uid
),
1830 from_kgid(&init_user_ns
, cred
->gid
),
1831 from_kuid(&init_user_ns
, cred
->euid
),
1832 from_kuid(&init_user_ns
, cred
->suid
),
1833 from_kuid(&init_user_ns
, cred
->fsuid
),
1834 from_kgid(&init_user_ns
, cred
->egid
),
1835 from_kgid(&init_user_ns
, cred
->sgid
),
1836 from_kgid(&init_user_ns
, cred
->fsgid
),
1837 tty
, audit_get_sessionid(tsk
));
1839 get_task_comm(name
, tsk
);
1840 audit_log_format(ab
, " comm=");
1841 audit_log_untrustedstring(ab
, name
);
1844 down_read(&mm
->mmap_sem
);
1846 audit_log_d_path(ab
, " exe=", &mm
->exe_file
->f_path
);
1847 up_read(&mm
->mmap_sem
);
1849 audit_log_format(ab
, " exe=(null)");
1850 audit_log_task_context(ab
);
1852 EXPORT_SYMBOL(audit_log_task_info
);
1855 * audit_log_link_denied - report a link restriction denial
1856 * @operation: specific link opreation
1857 * @link: the path that triggered the restriction
1859 void audit_log_link_denied(const char *operation
, struct path
*link
)
1861 struct audit_buffer
*ab
;
1862 struct audit_names
*name
;
1864 name
= kzalloc(sizeof(*name
), GFP_NOFS
);
1868 /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
1869 ab
= audit_log_start(current
->audit_context
, GFP_KERNEL
,
1873 audit_log_format(ab
, "op=%s", operation
);
1874 audit_log_task_info(ab
, current
);
1875 audit_log_format(ab
, " res=0");
1878 /* Generate AUDIT_PATH record with object. */
1879 name
->type
= AUDIT_TYPE_NORMAL
;
1880 audit_copy_inode(name
, link
->dentry
, link
->dentry
->d_inode
);
1881 audit_log_name(current
->audit_context
, name
, link
, 0, NULL
);
1887 * audit_log_end - end one audit record
1888 * @ab: the audit_buffer
1890 * The netlink_* functions cannot be called inside an irq context, so
1891 * the audit buffer is placed on a queue and a tasklet is scheduled to
1892 * remove them from the queue outside the irq context. May be called in
1895 void audit_log_end(struct audit_buffer
*ab
)
1899 if (!audit_rate_check()) {
1900 audit_log_lost("rate limit exceeded");
1902 struct nlmsghdr
*nlh
= nlmsg_hdr(ab
->skb
);
1903 nlh
->nlmsg_len
= ab
->skb
->len
- NLMSG_HDRLEN
;
1906 skb_queue_tail(&audit_skb_queue
, ab
->skb
);
1907 wake_up_interruptible(&kauditd_wait
);
1909 audit_printk_skb(ab
->skb
);
1913 audit_buffer_free(ab
);
1917 * audit_log - Log an audit record
1918 * @ctx: audit context
1919 * @gfp_mask: type of allocation
1920 * @type: audit message type
1921 * @fmt: format string to use
1922 * @...: variable parameters matching the format string
1924 * This is a convenience function that calls audit_log_start,
1925 * audit_log_vformat, and audit_log_end. It may be called
1928 void audit_log(struct audit_context
*ctx
, gfp_t gfp_mask
, int type
,
1929 const char *fmt
, ...)
1931 struct audit_buffer
*ab
;
1934 ab
= audit_log_start(ctx
, gfp_mask
, type
);
1936 va_start(args
, fmt
);
1937 audit_log_vformat(ab
, fmt
, args
);
1943 #ifdef CONFIG_SECURITY
1945 * audit_log_secctx - Converts and logs SELinux context
1947 * @secid: security number
1949 * This is a helper function that calls security_secid_to_secctx to convert
1950 * secid to secctx and then adds the (converted) SELinux context to the audit
1951 * log by calling audit_log_format, thus also preventing leak of internal secid
1952 * to userspace. If secid cannot be converted audit_panic is called.
1954 void audit_log_secctx(struct audit_buffer
*ab
, u32 secid
)
1959 if (security_secid_to_secctx(secid
, &secctx
, &len
)) {
1960 audit_panic("Cannot convert secid to context");
1962 audit_log_format(ab
, " obj=%s", secctx
);
1963 security_release_secctx(secctx
, len
);
1966 EXPORT_SYMBOL(audit_log_secctx
);
1969 EXPORT_SYMBOL(audit_log_start
);
1970 EXPORT_SYMBOL(audit_log_end
);
1971 EXPORT_SYMBOL(audit_log_format
);
1972 EXPORT_SYMBOL(audit_log
);