2 * Copyright (c) 2008-2009 Apple Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/param.h>
32 #include <config/config.h>
34 #include <sys/dirent.h>
35 #ifdef HAVE_FULL_QUEUE_H
36 #include <sys/queue.h>
37 #else /* !HAVE_FULL_QUEUE_H */
38 #include <compat/queue.h>
39 #endif /* !HAVE_FULL_QUEUE_H */
40 #include <sys/mount.h>
41 #include <sys/socket.h>
46 #include <netinet/in.h>
48 #include <bsm/audit.h>
49 #include <bsm/audit_uevents.h>
50 #include <bsm/auditd_lib.h>
51 #include <bsm/libbsm.h>
67 #ifndef __BSM_INTERNAL_NOTIFY_KEY
68 #define __BSM_INTERNAL_NOTIFY_KEY "com.apple.audit.change"
69 #endif /* __BSM_INTERNAL_NOTIFY_KEY */
70 #endif /* __APPLE__ */
73 * XXX This is temporary until this is moved to <bsm/audit.h> and shared with
76 #ifndef AUDIT_HARD_LIMIT_FREE_BLOCKS
77 #define AUDIT_HARD_LIMIT_FREE_BLOCKS 4
81 * Number of seconds to January 1, 2000
83 #define JAN_01_2000 946598400
89 TAILQ_ENTRY(dir_ent) dirs;
92 static TAILQ_HEAD(, dir_ent) dir_q;
99 TAILQ_ENTRY(audit_trail) at_trls;
102 static int auditd_minval = -1;
103 static int auditd_dist = 0;
105 static char auditd_host[MAXHOSTNAMELEN];
106 static int auditd_hostlen = -1;
108 static char *auditd_errmsg[] = {
109 "no error", /* ADE_NOERR ( 0) */
110 "could not parse audit_control(5) file", /* ADE_PARSE ( 1) */
111 "auditon(2) failed", /* ADE_AUDITON ( 2) */
112 "malloc(3) failed", /* ADE_NOMEM ( 3) */
113 "all audit log directories over soft limit", /* ADE_SOFTLIM ( 4) */
114 "all audit log directories over hard limit", /* ADE_HARDLIM ( 5) */
115 "could not create file name string", /* ADE_STRERR ( 6) */
116 "could not open audit record", /* ADE_AU_OPEN ( 7) */
117 "could not close audit record", /* ADE_AU_CLOSE ( 8) */
118 "could not set active audit session state", /* ADE_SETAUDIT ( 9) */
119 "auditctl(2) failed (trail still swapped)", /* ADE_ACTL (10) */
120 "auditctl(2) failed (trail not swapped)", /* ADE_ACTLERR (11) */
121 "could not swap audit trail file", /* ADE_SWAPERR (12) */
122 "could not rename crash recovery file", /* ADE_RENAME (13) */
123 "could not read 'current' link file", /* ADE_READLINK (14) */
124 "could not create 'current' link file", /* ADE_SYMLINK (15) */
125 "invalid argument", /* ADE_INVAL (16) */
126 "could not resolve hostname to address", /* ADE_GETADDR (17) */
127 "address family not supported", /* ADE_ADDRFAM (18) */
128 "error expiring audit trail files", /* ADE_EXPIRE (19) */
131 #define MAXERRCODE (sizeof(auditd_errmsg) / sizeof(auditd_errmsg[0]))
133 #define NA_EVENT_STR_SIZE 128
134 #define POL_STR_SIZE 128
138 * Look up and return the error string for the given audit error code.
141 auditd_strerror(int errcode)
145 if (idx < 0 || idx > (int)MAXERRCODE)
146 return ("Invalid auditd error code");
148 return (auditd_errmsg[idx]);
153 * Free our local list of directory names and init list.
158 struct dir_ent *d1, *d2;
160 d1 = TAILQ_FIRST(&dir_q);
162 d2 = TAILQ_NEXT(d1, dirs);
171 * Concat the directory name to the given file name.
172 * XXX We should affix the hostname also
175 affixdir(char *name, struct dir_ent *dirent)
180 * Sanity check on file name.
182 if (strlen(name) != FILENAME_LEN) {
188 * If the host is set then also add the hostname to the filename.
190 if (auditd_hostlen != -1)
191 asprintf(&fn, "%s/%s.%s", dirent->dirname, name, auditd_host);
193 asprintf(&fn, "%s/%s", dirent->dirname, name);
198 * Insert the directory entry in the list by the way they are ordered in
199 * audit_control(5). Move the entries that are over the soft and hard limits
203 insert_orderly(struct dir_ent *denew)
207 TAILQ_FOREACH(dep, &dir_q, dirs) {
208 if (dep->softlim == 1 && denew->softlim == 0) {
209 TAILQ_INSERT_BEFORE(dep, denew, dirs);
212 if (dep->hardlim == 1 && denew->hardlim == 0) {
213 TAILQ_INSERT_BEFORE(dep, denew, dirs);
217 TAILQ_INSERT_TAIL(&dir_q, denew, dirs);
221 * Get the min percentage of free blocks from audit_control(5) and that
222 * value in the kernel. Return:
223 * ADE_NOERR on success,
224 * ADE_PARSE error parsing audit_control(5),
227 auditd_set_dist(void)
241 * Get the host from audit_control(5) and set it in the audit kernel
242 * information. Return:
243 * ADE_NOERR on success.
244 * ADE_PARSE error parsing audit_control(5).
245 * ADE_AUDITON error getting/setting auditon(2) value.
246 * ADE_GETADDR error getting address info for host.
247 * ADE_ADDRFAM un-supported address family.
250 auditd_set_host(void)
252 struct sockaddr_in6 *sin6;
253 struct sockaddr_in *sin;
254 struct addrinfo *res;
255 struct auditinfo_addr aia;
256 int error, ret = ADE_NOERR;
258 if (getachost(auditd_host, sizeof(auditd_host)) != 0) {
262 * To maintain reverse compatability with older audit_control
263 * files, simply drop a warning if the host parameter has not
264 * been set. However, we will explicitly disable the
265 * generation of extended audit header by passing in a zeroed
268 bzero(&aia, sizeof(aia));
269 aia.ai_termid.at_type = AU_IPv4;
270 error = audit_set_kaudit(&aia, sizeof(aia));
271 if (error < 0 && errno != ENOSYS)
275 auditd_hostlen = strlen(auditd_host);
276 error = getaddrinfo(auditd_host, NULL, NULL, &res);
278 return (ADE_GETADDR);
279 switch (res->ai_family) {
281 sin6 = (struct sockaddr_in6 *) res->ai_addr;
282 bcopy(&sin6->sin6_addr.s6_addr,
283 &aia.ai_termid.at_addr[0], sizeof(struct in6_addr));
284 aia.ai_termid.at_type = AU_IPv6;
288 sin = (struct sockaddr_in *) res->ai_addr;
289 bcopy(&sin->sin_addr.s_addr,
290 &aia.ai_termid.at_addr[0], sizeof(struct in_addr));
291 aia.ai_termid.at_type = AU_IPv4;
295 /* Un-supported address family in host parameter. */
296 errno = EAFNOSUPPORT;
297 return (ADE_ADDRFAM);
300 if (audit_set_kaudit(&aia, sizeof(aia)) < 0)
307 * Get the min percentage of free blocks from audit_control(5) and that
308 * value in the kernel. Return:
309 * ADE_NOERR on success,
310 * ADE_PARSE error parsing audit_control(5),
311 * ADE_AUDITON error getting/setting auditon(2) value.
314 auditd_set_minfree(void)
318 if (getacmin(&auditd_minval) != 0)
321 if (audit_get_qctrl(&qctrl, sizeof(qctrl)) != 0)
322 return (ADE_AUDITON);
324 if (qctrl.aq_minfree != auditd_minval) {
325 qctrl.aq_minfree = auditd_minval;
326 if (audit_set_qctrl(&qctrl, sizeof(qctrl)) != 0)
327 return (ADE_AUDITON);
334 * Convert a trailname into a timestamp (seconds). Return 0 if the conversion
338 trailname_to_tstamp(char *fn, time_t *tstamp)
341 char ts[TIMESTAMP_LEN + 1];
347 * Get the ending time stamp.
349 if ((p = strchr(fn, '.')) == NULL)
351 strlcpy(ts, ++p, sizeof(ts));
352 if (strlen(ts) != POSTFIX_LEN)
355 bzero(&tm, sizeof(tm));
358 p = ts + POSTFIX_LEN - 2;
360 if (tm.tm_sec < 0 || tm.tm_sec > 60)
366 if (tm.tm_min < 0 || tm.tm_min > 59)
371 tm.tm_hour = atol(p);
372 if (tm.tm_hour < 0 || tm.tm_hour > 23)
375 /* day of month (1-31) */
377 tm.tm_mday = atol(p);
378 if (tm.tm_mday < 1 || tm.tm_mday > 31)
383 tm.tm_mon = atol(p) - 1;
384 if (tm.tm_mon < 0 || tm.tm_mon > 11)
387 /* year (year - 1900) */
389 tm.tm_year = atol(p) - 1900;
393 *tstamp = timegm(&tm);
399 * Remove audit trails files according to the expiration conditions. Returns:
400 * ADE_NOERR on success or there is nothing to do.
401 * ADE_PARSE if error parsing audit_control(5).
402 * ADE_NOMEM if could not allocate memory.
403 * ADE_READLINK if could not read link file.
404 * ADE_EXPIRE if there was an unexpected error.
407 auditd_expire_trails(int (*warn_expired)(char *))
409 int andflg, len, ret = ADE_NOERR;
410 size_t expire_size, total_size = 0L;
411 time_t expire_age, oldest_time, current_time = time(NULL);
412 struct dir_ent *traildir;
413 struct audit_trail *at;
415 TAILQ_HEAD(au_trls_head, audit_trail) head =
416 TAILQ_HEAD_INITIALIZER(head);
418 char activefn[MAXPATHLEN];
421 * Read the expiration conditions. If no conditions then return no
424 if (getacexpire(&andflg, &expire_age, &expire_size) < 0)
426 if (!expire_age && !expire_size)
430 * Read the 'current' trail file name. Trim off directory path.
433 len = readlink(AUDIT_CURRENT_LINK, activefn, MAXPATHLEN - 1);
435 return (ADE_READLINK);
436 if ((afnp = strrchr(activefn, '/')) != NULL)
441 * Build tail queue of the trail files.
443 TAILQ_FOREACH(traildir, &dir_q, dirs) {
447 dirp = opendir(traildir->dirname);
448 while ((dp = readdir(dirp)) != NULL) {
450 struct audit_trail *new;
453 * Quickly filter non-trail files.
455 if (dp->d_namlen < FILENAME_LEN ||
456 dp->d_name[POSTFIX_LEN] != '.')
459 if (asprintf(&pn, "%s/%s", traildir->dirname,
465 if (stat(pn, &stbuf) < 0 || !S_ISREG(stbuf.st_mode)) {
470 total_size += stbuf.st_size;
473 * If this is the 'current' audit trail then
474 * don't add it to the tail queue.
476 if (NULL != afnp && strcmp(dp->d_name, afnp) == 0) {
482 * Get the ending time stamp encoded in the trail
483 * name. If we can't read it or if it is older
484 * than Jan 1, 2000 then use the mtime.
486 if (trailname_to_tstamp(dp->d_name, &tstamp) != 0 ||
487 tstamp < JAN_01_2000)
488 tstamp = stbuf.st_mtime;
491 * If the time stamp is older than Jan 1, 2000 then
492 * update the mtime of the trail file to the current
493 * time. This is so we don't prematurely remove a trail
494 * file that was created while the system clock reset
495 * to the * "beginning of time" but later the system
496 * clock is set to the correct current time.
498 if (current_time >= JAN_01_2000 &&
499 tstamp < JAN_01_2000) {
500 struct timeval tv[2];
502 tstamp = stbuf.st_mtime = current_time;
503 TIMESPEC_TO_TIMEVAL(&tv[0],
504 &stbuf.st_atimespec);
505 TIMESPEC_TO_TIMEVAL(&tv[1],
506 &stbuf.st_mtimespec);
511 * Allocate and populate the new entry.
513 new = malloc(sizeof(*new));
519 new->at_time = tstamp;
520 new->at_size = stbuf.st_size;
524 * Check to see if we have a new head. Otherwise,
525 * walk the tailq from the tail first and do a simple
528 if (TAILQ_EMPTY(&head) ||
529 new->at_time <= TAILQ_FIRST(&head)->at_time) {
530 TAILQ_INSERT_HEAD(&head, new, at_trls);
534 TAILQ_FOREACH_REVERSE(at, &head, au_trls_head, at_trls)
535 if (new->at_time >= at->at_time) {
536 TAILQ_INSERT_AFTER(&head, at, new,
545 oldest_time = current_time - expire_age;
548 * Expire trail files, oldest (mtime) first, if the given
549 * conditions are met.
551 at = TAILQ_FIRST(&head);
553 struct audit_trail *at_next = TAILQ_NEXT(at, at_trls);
556 if ((expire_size && total_size > expire_size) &&
557 (expire_age && at->at_time < oldest_time)) {
559 (*warn_expired)(at->at_path);
560 if (unlink(at->at_path) < 0)
562 total_size -= at->at_size;
565 if ((expire_size && total_size > expire_size) ||
566 (expire_age && at->at_time < oldest_time)) {
568 (*warn_expired)(at->at_path);
569 if (unlink(at->at_path) < 0)
571 total_size -= at->at_size;
584 * Parses the "dir" entry in audit_control(5) into an ordered list. Also, will
585 * set the minfree and host values if not already set. Arguments include
586 * function pointers to audit_warn functions for soft and hard limits. Returns:
587 * ADE_NOERR on success,
588 * ADE_PARSE error parsing audit_control(5),
589 * ADE_AUDITON error getting/setting auditon(2) value,
590 * ADE_NOMEM error allocating memory,
591 * ADE_SOFTLIM if all the directories are over the soft limit,
592 * ADE_HARDLIM if all the directories are over the hard limit,
595 auditd_read_dirs(int (*warn_soft)(char *), int (*warn_hard)(char *))
597 char cur_dir[MAXNAMLEN];
598 struct dir_ent *dirent;
606 if (auditd_minval == -1 && (err = auditd_set_minfree()) != 0)
609 if (auditd_hostlen == -1)
613 * Init directory q. Force a re-read of the file the next time.
619 * Read the list of directories into an ordered linked list
620 * admin's preference, then those over soft limit and, finally,
621 * those over the hard limit.
623 * XXX We should use the reentrant interfaces once they are
626 while (getacdir(cur_dir, MAXNAMLEN) >= 0) {
627 if (statfs(cur_dir, &sfs) < 0)
628 continue; /* XXX should warn */
629 soft = (sfs.f_bfree < (sfs.f_blocks * auditd_minval / 100 )) ?
631 hard = (sfs.f_bfree < AUDIT_HARD_LIMIT_FREE_BLOCKS) ? 1 : 0;
634 (*warn_soft)(cur_dir);
639 (*warn_hard)(cur_dir);
642 dirent = (struct dir_ent *) malloc(sizeof(struct dir_ent));
645 dirent->softlim = soft;
646 dirent->hardlim = hard;
647 dirent->dirname = (char *) malloc(MAXNAMLEN);
648 if (dirent->dirname == NULL) {
652 strlcpy(dirent->dirname, cur_dir, MAXNAMLEN);
653 insert_orderly(dirent);
658 return (ADE_HARDLIM);
660 return (ADE_SOFTLIM);
665 auditd_close_dirs(void)
674 * Process the audit event file, obtaining a class mapping for each event, and
675 * set that mapping into the kernel. Return:
676 * n number of event mappings that were successfully processed,
677 * ADE_NOMEM if there was an error allocating memory.
680 auditd_set_evcmap(void)
682 au_event_ent_t ev, *evp;
683 au_evclass_map_t evc_map;
687 * XXX There's a risk here that the BSM library will return NULL
688 * for an event when it can't properly map it to a class. In that
689 * case, we will not process any events beyond the one that failed,
690 * but should. We need a way to get a count of the events.
692 ev.ae_name = (char *)malloc(AU_EVENT_NAME_MAX);
693 ev.ae_desc = (char *)malloc(AU_EVENT_DESC_MAX);
694 if (ev.ae_name == NULL || ev.ae_desc == NULL) {
695 if (ev.ae_name != NULL)
701 * XXXRW: Currently we have no way to remove mappings from the kernel
702 * when they are removed from the file-based mappings.
706 while ((evp = getauevent_r(evp)) != NULL) {
707 evc_map.ec_number = evp->ae_number;
708 evc_map.ec_class = evp->ae_class;
709 if (audit_set_class(&evc_map, sizeof(evc_map)) == 0)
720 * Get the non-attributable event string and set the kernel mask. Return:
721 * ADE_NOERR on success,
722 * ADE_PARSE error parsing audit_control(5),
723 * ADE_AUDITON error setting the mask using auditon(2).
726 auditd_set_namask(void)
729 char naeventstr[NA_EVENT_STR_SIZE];
731 if (getacna(naeventstr, NA_EVENT_STR_SIZE) != 0 ||
732 getauditflagsbin(naeventstr, &aumask) != 0)
735 if (audit_set_kmask(&aumask, sizeof(aumask)) != 0)
736 return (ADE_AUDITON);
742 * Set the audit control policy if a policy is configured in audit_control(5),
743 * implement the policy. However, if one isn't defined or if there is an error
744 * parsing the control file, set AUDIT_CNT to avoid leaving the system in a
745 * fragile state. Return:
746 * ADE_NOERR on success,
747 * ADE_PARSE error parsing audit_control(5),
748 * ADE_AUDITON error setting policy using auditon(2).
751 auditd_set_policy(void)
754 char polstr[POL_STR_SIZE];
756 if (getacpol(polstr, POL_STR_SIZE) != 0 ||
757 au_strtopol(polstr, &policy) != 0) {
759 if (audit_set_policy(&policy) != 0)
760 return (ADE_AUDITON);
764 if (audit_set_policy(&policy) != 0)
765 return (ADE_AUDITON);
771 * Set trail rotation size. Return:
772 * ADE_NOERR on success,
773 * ADE_PARSE error parsing audit_control(5),
774 * ADE_AUDITON error setting file size using auditon(2).
777 auditd_set_fsize(void)
783 * Set trail rotation size.
785 if (getacfilesz(&filesz) != 0)
788 bzero(&au_fstat, sizeof(au_fstat));
789 au_fstat.af_filesz = filesz;
790 if (audit_set_fsize(&au_fstat, sizeof(au_fstat)) != 0)
791 return (ADE_AUDITON);
797 inject_dist(const char *fromname, char *toname, size_t tonamesize)
801 ptr = strrchr(fromname, '/');
803 assert(ptr - fromname < (ssize_t)tonamesize);
804 strlcpy(toname, fromname, ptr - fromname + 1);
805 strlcat(toname, "/dist/", tonamesize);
806 strlcat(toname, ptr + 1, tonamesize);
810 auditdist_link(const char *filename)
812 char fname[MAXPATHLEN];
815 inject_dist(filename, fname, sizeof(fname));
817 (void) link(filename, fname);
824 auditd_rename(const char *fromname, const char *toname)
826 char fname[MAXPATHLEN], tname[MAXPATHLEN];
829 inject_dist(fromname, fname, sizeof(fname));
830 inject_dist(toname, tname, sizeof(tname));
832 (void) rename(fname, tname);
835 return (rename(fromname, toname));
839 * Create the new audit file with appropriate permissions and ownership.
840 * Call auditctl(2) for this file.
841 * Try to clean up if something goes wrong.
842 * *errorp is modified only on auditctl(2) failure.
845 open_trail(char *fname, gid_t gid, int *errorp)
849 /* XXXPJD: What should we do if the file already exists? */
850 fd = open(fname, O_RDONLY | O_CREAT, S_IRUSR);
853 if (fchown(fd, -1, gid) < 0 || fchmod(fd, S_IRUSR | S_IRGRP) < 0) {
855 (void) unlink(fname);
859 if (auditctl(fname) < 0) {
861 (void) unlink(fname);
864 (void) auditdist_link(fname);
869 * Create the new audit trail file, swap with existing audit file. Arguments
870 * include timestamp for the filename, a pointer to a string for returning the
871 * new file name, GID for trail file, and audit_warn function pointer for
872 * 'getacdir()' errors. Returns:
873 * ADE_NOERR on success,
874 * ADE_STRERR if the file name string could not be created,
875 * ADE_SWAPERR if the audit trail file could not be swapped,
876 * ADE_ACTL if the auditctl(2) call failed but file swap still
878 * ADE_ACTLERR if the auditctl(2) call failed and file swap failed.
879 * ADE_SYMLINK if symlink(2) failed updating the current link.
882 auditd_swap_trail(char *TS, char **newfile, gid_t gid,
883 int (*warn_getacdir)(char *))
885 char timestr[FILENAME_LEN + 1];
887 struct dir_ent *dirent;
890 if (strlen(TS) != TIMESTAMP_LEN ||
891 snprintf(timestr, sizeof(timestr), "%s.%s", TS,
892 NOT_TERMINATED) < 0) {
897 /* Try until we succeed. */
898 TAILQ_FOREACH(dirent, &dir_q, dirs) {
901 if ((fn = affixdir(timestr, dirent)) == NULL)
905 * Create the file and pass to the kernel if all went well.
907 if (open_trail(fn, gid, &saverrno) == 0) {
912 * auditctl() failed but still
913 * successful. Return errno and "soft"
922 * auditctl failed setting log file. Try again.
925 * Tell the administrator about lack of permissions for dir.
927 if (warn_getacdir != NULL)
928 (*warn_getacdir)(dirent->dirname);
932 return (ADE_ACTLERR);
934 return (ADE_SWAPERR);
938 * Mask calling process from being audited. Returns:
939 * ADE_NOERR on success,
940 * ADE_SETAUDIT if setaudit(2) fails.
944 auditd_prevent_audit(void)
946 auditinfo_addr_t aia;
949 * To prevent event feedback cycles and avoid audit becoming stalled if
950 * auditing is suspended we mask this processes events from being
951 * audited. We allow the uid, tid, and mask fields to be implicitly
952 * set to zero, but do set the audit session ID to the PID.
954 * XXXRW: Is there more to it than this?
956 bzero(&aia, sizeof(aia));
957 aia.ai_asid = AU_ASSIGN_ASID;
958 aia.ai_termid.at_type = AU_IPv4;
959 if (setaudit_addr(&aia, sizeof(aia)) != 0)
960 return (ADE_SETAUDIT);
965 auditd_prevent_audit(void)
970 * To prevent event feedback cycles and avoid audit becoming stalled if
971 * auditing is suspended we mask this processes events from being
972 * audited. We allow the uid, tid, and mask fields to be implicitly
973 * set to zero, but do set the audit session ID to the PID.
975 * XXXRW: Is there more to it than this?
977 bzero(&ai, sizeof(ai));
978 ai.ai_asid = getpid();
979 if (setaudit(&ai) != 0)
980 return (ADE_SETAUDIT);
983 #endif /* !__APPLE__ */
986 * Generate and submit audit record for audit startup or shutdown. The event
987 * argument can be AUE_audit_recovery, AUE_audit_startup or
988 * AUE_audit_shutdown. The path argument will add a path token, if not NULL.
990 * AUE_NOERR on success,
991 * ADE_NOMEM if memory allocation fails,
992 * ADE_AU_OPEN if au_open(3) fails,
993 * ADE_AU_CLOSE if au_close(3) fails.
996 auditd_gen_record(int event, char *path)
1001 char *autext = NULL;
1003 struct auditinfo_addr aia;
1005 if (event == AUE_audit_startup)
1006 asprintf(&autext, "%s::Audit startup", getprogname());
1007 else if (event == AUE_audit_shutdown)
1008 asprintf(&autext, "%s::Audit shutdown", getprogname());
1009 else if (event == AUE_audit_recovery)
1010 asprintf(&autext, "%s::Audit recovery", getprogname());
1016 if ((aufd = au_open()) == -1) {
1018 return (ADE_AU_OPEN);
1020 bzero(&aia, sizeof(aia));
1021 uid = getuid(); pid = getpid();
1022 if ((tok = au_to_subject32_ex(uid, geteuid(), getegid(), uid, getgid(),
1023 pid, pid, &aia.ai_termid)) != NULL)
1024 au_write(aufd, tok);
1025 if ((tok = au_to_text(autext)) != NULL)
1026 au_write(aufd, tok);
1028 if (path != NULL && (tok = au_to_path(path)) != NULL)
1029 au_write(aufd, tok);
1030 if ((tok = au_to_return32(0, 0)) != NULL)
1031 au_write(aufd, tok);
1032 if (au_close(aufd, 1, event) == -1)
1033 return (ADE_AU_CLOSE);
1039 * Check for a 'current' symlink and do crash recovery, if needed. Create a new
1040 * 'current' symlink. The argument 'curfile' is the file the 'current' symlink
1041 * should point to. Returns:
1042 * ADE_NOERR on success,
1043 * ADE_AU_OPEN if au_open(3) fails,
1044 * ADE_AU_CLOSE if au_close(3) fails.
1045 * ADE_RENAME if error renaming audit trail file,
1046 * ADE_READLINK if error reading the 'current' link,
1047 * ADE_SYMLINK if error creating 'current' link.
1050 auditd_new_curlink(char *curfile)
1056 char recoveredname[MAXPATHLEN];
1057 char newname[MAXPATHLEN];
1060 * Check to see if audit was shutdown properly. If not, clean up,
1061 * recover previous audit trail file, and generate audit record.
1063 len = readlink(AUDIT_CURRENT_LINK, recoveredname,
1064 sizeof(recoveredname) - 1);
1066 /* 'current' exist but is it pointing at a valid file? */
1067 recoveredname[len++] = '\0';
1068 if (stat(recoveredname, &sb) == 0) {
1069 /* Yes, rename it to a crash recovery file. */
1070 strlcpy(newname, recoveredname, sizeof(newname));
1072 if ((ptr = strstr(newname, NOT_TERMINATED)) != NULL) {
1073 memcpy(ptr, CRASH_RECOVERY, POSTFIX_LEN);
1074 if (auditd_rename(recoveredname, newname) != 0)
1075 return (ADE_RENAME);
1077 return (ADE_STRERR);
1082 /* 'current' symlink is (now) invalid so remove it. */
1083 (void) unlink(AUDIT_CURRENT_LINK);
1085 /* Note the crash recovery in current audit trail */
1086 err = auditd_gen_record(AUE_audit_recovery, path);
1091 if (len < 0 && errno != ENOENT)
1092 return (ADE_READLINK);
1094 if (symlink(curfile, AUDIT_CURRENT_LINK) != 0)
1095 return (ADE_SYMLINK);
1101 * Do just what we need to quickly start auditing. Assume no system logging or
1107 audit_quick_start(void)
1110 char *newfile = NULL;
1112 char TS[TIMESTAMP_LEN + 1];
1116 * Mask auditing of this process.
1118 if (auditd_prevent_audit() != 0)
1122 * Read audit_control and get log directories.
1124 err = auditd_read_dirs(NULL, NULL);
1125 if (err != ADE_NOERR && err != ADE_SOFTLIM)
1129 * Setup trail file distribution.
1131 (void) auditd_set_dist();
1134 * Create a new audit trail log.
1136 if (getTSstr(tt, TS, sizeof(TS)) != 0)
1138 err = auditd_swap_trail(TS, &newfile, getgid(), NULL);
1139 if (err != ADE_NOERR && err != ADE_ACTL) {
1145 * Add the current symlink and recover from crash, if needed.
1147 if (auditd_new_curlink(newfile) != 0) {
1153 * At this point auditing has started so generate audit start-up record.
1155 if (auditd_gen_record(AUE_audit_startup, NULL) != 0) {
1161 * Configure the audit controls.
1163 (void) auditd_set_evcmap();
1164 (void) auditd_set_namask();
1165 (void) auditd_set_policy();
1166 (void) auditd_set_fsize();
1167 (void) auditd_set_minfree();
1168 (void) auditd_set_host();
1171 if (newfile != NULL)
1178 * Shut down auditing quickly. Assumes that is only called on system shutdown.
1184 audit_quick_stop(void)
1190 char oldname[MAXPATHLEN];
1191 char newname[MAXPATHLEN];
1192 char TS[TIMESTAMP_LEN + 1];
1195 * Auditing already disabled?
1197 if (audit_get_cond(&cond) != 0)
1199 if (cond == AUC_NOAUDIT)
1203 * Generate audit shutdown record.
1205 (void) auditd_gen_record(AUE_audit_shutdown, NULL);
1208 * Shutdown auditing in the kernel.
1210 cond = AUC_DISABLED;
1211 if (audit_set_cond(&cond) != 0)
1213 #ifdef __BSM_INTERNAL_NOTIFY_KEY
1214 notify_post(__BSM_INTERNAL_NOTIFY_KEY);
1218 * Rename last audit trail and remove 'current' link.
1220 len = readlink(AUDIT_CURRENT_LINK, oldname, sizeof(oldname) - 1);
1223 oldname[len++] = '\0';
1225 if (getTSstr(tt, TS, sizeof(TS)) != 0)
1228 strlcpy(newname, oldname, sizeof(newname));
1230 if ((ptr = strstr(newname, NOT_TERMINATED)) != NULL) {
1231 memcpy(ptr, TS, POSTFIX_LEN);
1232 if (auditd_rename(oldname, newname) != 0)
1237 (void) unlink(AUDIT_CURRENT_LINK);