1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2017 OmniOS Community Edition (OmniOSce) Association.
25 */
26
27 #include <bsm/adt.h>
28 #include <bsm/adt_event.h>
29 #include <assert.h>
30 #include <bsm/audit.h>
31 #include <bsm/audit_record.h>
32 #include <bsm/libbsm.h>
33 #include <door.h>
34 #include <errno.h>
35 #include <generic.h>
36 #include <md5.h>
37 #include <sys/mkdev.h>
38 #include <netdb.h>
39 #include <nss_dbdefs.h>
40 #include <pwd.h>
41 #include <sys/stat.h>
42 #include <time.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <synch.h>
46 #include <sys/systeminfo.h>
47 #include <syslog.h>
48 #include <thread.h>
49 #include <unistd.h>
50 #include <adt_xlate.h>
51 #include <adt_ucred.h>
52 #include <arpa/inet.h>
53 #include <net/if.h>
54 #include <libinetutil.h>
55
56 static int adt_selected(struct adt_event_state *, au_event_t, int);
57 static int adt_init(adt_internal_state_t *, int);
58 static int adt_import(adt_internal_state_t *, const adt_export_data_t *);
59 static m_label_t *adt_ucred_label(ucred_t *);
60 static void adt_setto_unaudited(adt_internal_state_t *);
61 static int adt_get_local_address(int, struct ifaddrlist *);
62
63 #ifdef C2_DEBUG
64 #define DPRINTF(x) { (void) printf x; }
65 #define DFLUSH (void) fflush(stdout);
66 #else
67 #define DPRINTF(x)
68 #define DFLUSH
69 #endif
70
71 /*
72 * Local audit states are a bit mask
73 *
74 * The global audit states are
75 *
76 * AUC_UNSET 0 - on/off hasn't been decided
77 * AUC_ENABLED 1 - loaded and enabled
78 *
79 * The local Zone states are
80 *
81 * AUC_AUDITING 0x1 - audit daemon is active
82 * AUC_NOAUDIT 0x2 - audit daemon is not active
83 * AUC_INIT_AUDIT 0x4 - audit is ready but auditd has not run
84 * AUC_NOSPACE 0x8 - audit enabled, no space for audit records
85 *
86 * The only values returned by auditon(A_GETCOND) are:
87 * AUC_INIT_AUDIT, AUC_AUDITING, AUC_NOAUDIT, AUC_NOSPACE
88 *
89 * The pseudo audit state used when the c2audit module is excluded is
90 *
91 * AUC_DISABLED 0x100 - c2audit module is excluded
92 */
93
94 static int auditstate = AUC_DISABLED; /* default state */
95
96 /*
97 * adt_write_syslog
98 *
99 * errors that are not the user's fault (bugs or whatever in
100 * the underlying audit code are noted in syslog.)
101 *
102 * Avoid calling adt_write_syslog for things that can happen
103 * at high volume.
104 *
105 * syslog's open (openlog) and close (closelog) are interesting;
106 * openlog *may* create a file descriptor and is optional. closelog
107 * *will* close any open file descriptors and is also optional.
108 *
109 * Since syslog may also be used by the calling application, the
110 * choice is to avoid openlog, which sets some otherwise useful
111 * parameters, and to embed "Solaris_audit" in the log message.
112 */
113
114 void
115 adt_write_syslog(const char *message, int err)
116 {
117 int save_errno = errno;
118 int mask_priority;
119
120 DPRINTF(("syslog called: %s\n", message));
121
122 mask_priority = setlogmask(LOG_MASK(LOG_ALERT));
123 errno = err;
124 syslog(LOG_ALERT, "Solaris_audit %s: %m", message);
125 (void) setlogmask(mask_priority);
126 errno = save_errno;
127 }
128
129 /*
130 * return true if c2audit is not excluded.
131 *
132 * For purpose of this API, anything but AUC_DISABLED
133 * is enabled; however one never actually sees
134 * AUC_DISABLED since auditon returns ENOTSUP in that case. Any
135 * auditon error is considered the same as ENOTSUP for our
136 * purpose. auditstate is not changed by auditon if an error
137 * is returned.
138 */
139
140 /*
141 * XXX this should probably be eliminated and adt_audit_state() replace it.
142 * All the legitimate uses are to not fork a waiting process for
143 * process exit processing, as in su, login, dtlogin. Other bogus
144 * users are zoneadmd and init.
145 * All but dtlogin are in ON, so we can do this without cross gate
146 * synchronization.
147 *
148 * No longer used in adt.c.
149 */
150
151 boolean_t
152 adt_audit_enabled(void)
153 {
154
155 (void) auditon(A_GETCOND, (caddr_t)&auditstate, sizeof (auditstate));
156
157 return (auditstate != AUC_DISABLED);
158 }
159
160 /*
161 * See adt_audit_enabled() for state discussions.
162 * The state parameter is a hedge until all the uses become clear.
163 * Likely if adt_audit_enabled is brought internal to this file,
164 * it could be modified to take one or more parameters to describe the
165 * state.
166 */
167
168 boolean_t
169 adt_audit_state(int states)
170 {
171
172 (void) auditon(A_GETCOND, (caddr_t)&auditstate, sizeof (auditstate));
173
174 return ((auditstate & states) ? B_TRUE : B_FALSE);
175 }
176
177 /*
178 * Get user_specific/non-attributable audit mask. This may be called even when
179 * auditing is off.
180 */
181
182 static int
183 adt_get_mask_from_user(uid_t uid, au_mask_t *mask)
184 {
185 struct passwd pwd;
186 long buff_sz;
187 char *pwd_buff;
188
189
190 if (auditstate & AUC_DISABLED) {
191 /* c2audit excluded */
192 mask->am_success = 0;
193 mask->am_failure = 0;
194 } else if (uid <= MAXUID) {
195 if ((buff_sz = sysconf(_SC_GETPW_R_SIZE_MAX)) == -1) {
196 adt_write_syslog("couldn't determine maximum size of "
197 "password buffer", errno);
198 return (-1);
199 }
200 if ((pwd_buff = calloc(1, (size_t)++buff_sz)) == NULL) {
201 return (-1);
202 }
203 if (getpwuid_r(uid, &pwd, pwd_buff, (int)buff_sz) == NULL) {
204 errno = EINVAL; /* user doesn't exist */
205 free(pwd_buff);
206 return (-1);
207 }
208 if (au_user_mask(pwd.pw_name, mask)) {
209 free(pwd_buff);
210 errno = EFAULT; /* undetermined failure */
211 return (-1);
212 }
213 free(pwd_buff);
214 } else if (auditon(A_GETKMASK, (caddr_t)mask, sizeof (*mask)) == -1) {
215 return (-1);
216 }
217
218 return (0);
219 }
220
221 /*
222 * adt_get_unique_id -- generate a hopefully unique 32 bit value
223 *
224 * there will be a follow up to replace this with the use of /dev/random
225 *
226 * An MD5 hash is taken on a buffer of
227 * hostname . audit id . unix time . pid . count
228 *
229 * "count = noise++;" is subject to a race condition but I don't
230 * see a need to put a lock around it.
231 */
232
233 au_asid_t
234 adt_get_unique_id(au_id_t uid)
235 {
236 char hostname[MAXHOSTNAMELEN];
237 union {
238 au_id_t v[4];
239 unsigned char obuff[128/8];
240 } output;
241 MD5_CTX context;
242
243 static int noise = 0;
244
245 int count = noise++;
246 time_t timebits = time(NULL);
247 pid_t pidbits = getpid();
248 au_asid_t retval = 0;
249
250 if (gethostname(hostname, MAXHOSTNAMELEN)) {
251 adt_write_syslog("gethostname call failed", errno);
252 (void) strncpy(hostname, "invalidHostName", MAXHOSTNAMELEN);
253 }
254
255 while (retval == 0) { /* 0 is the only invalid result */
256 MD5Init(&context);
257
258 MD5Update(&context, (unsigned char *)hostname,
259 (unsigned int) strlen((const char *)hostname));
260
261 MD5Update(&context, (unsigned char *) &uid, sizeof (uid_t));
262
263 MD5Update(&context,
264 (unsigned char *) &timebits, sizeof (time_t));
265
266 MD5Update(&context, (unsigned char *) &pidbits,
267 sizeof (pid_t));
268
269 MD5Update(&context, (unsigned char *) &(count), sizeof (int));
270 MD5Final(output.obuff, &context);
271
272 retval = output.v[count % 4];
273 }
274 return (retval);
275 }
276
277 /*
278 * the following "port" function deals with the following issues:
279 *
280 * 1 the kernel and ucred deal with a dev_t as a 64 bit value made
281 * up from a 32 bit major and 32 bit minor.
282 * 2 User space deals with a dev_t as either the above 64 bit value
283 * or a 32 bit value made from a 14 bit major and an 18 bit minor.
284 * 3 The various audit interfaces (except ucred) pass the 32 or
285 * 64 bit version depending the architecture of the userspace
286 * application. If you get a port value from ucred and pass it
287 * to the kernel via auditon(), it must be squeezed into a 32
288 * bit value because the kernel knows the userspace app's bit
289 * size.
290 *
291 * The internal state structure for adt (adt_internal_state_t) uses
292 * dev_t, so adt converts data from ucred to fit. The import/export
293 * functions, however, can't know if they are importing/exporting
294 * from 64 or 32 bit applications, so they always send 64 bits and
295 * the 32 bit end(s) are responsible to convert 32 -> 64 -> 32 as
296 * appropriate.
297 */
298
299 /*
300 * adt_cpy_tid() -- if lib is 64 bit, just copy it (dev_t and port are
301 * both 64 bits). If lib is 32 bits, squeeze the two-int port into
302 * a 32 bit dev_t. A port fits in the "minor" part of au_port_t,
303 * so it isn't broken up into pieces. (When it goes to the kernel
304 * and back, however, it will have been split into major/minor
305 * pieces.)
306 */
307
308 static void
309 adt_cpy_tid(au_tid_addr_t *dest, const au_tid64_addr_t *src)
310 {
311 #ifdef _LP64
312 (void) memcpy(dest, src, sizeof (au_tid_addr_t));
313 #else /* _LP64 */
314 dest->at_type = src->at_type;
315
316 dest->at_port = src->at_port.at_minor & MAXMIN32;
317 dest->at_port |= (src->at_port.at_major & MAXMAJ32) <<
318 NBITSMINOR32;
319
320 (void) memcpy(dest->at_addr, src->at_addr, 4 * sizeof (uint32_t));
321 #endif /* _LP64 */
322 }
323
324 /*
325 * adt_start_session -- create interface handle, create context
326 *
327 * The imported_state input is normally NULL, if not, it represents
328 * a continued session; its values obviate the need for a subsequent
329 * call to adt_set_user().
330 *
331 * The flag is used to decide how to set the initial state of the session.
332 * If 0, the session is "no audit" until a call to adt_set_user; if
333 * ADT_USE_PROC_DATA, the session is built from the process audit
334 * characteristics obtained from the kernel. If imported_state is
335 * not NULL, the resulting audit mask is an OR of the current process
336 * audit mask and that passed in.
337 *
338 * The basic model is that the caller can use the pointer returned
339 * by adt_start_session whether or not auditing is enabled or an
340 * error was returned. The functions that take the session handle
341 * as input generally return without doing anything if auditing is
342 * disabled.
343 */
344
345 int
346 adt_start_session(adt_session_data_t **new_session,
347 const adt_export_data_t *imported_state, adt_session_flags_t flags)
348 {
349 adt_internal_state_t *state;
350 adt_session_flags_t flgmask = ADT_FLAGS_ALL;
351
352 /* test and set auditstate */
353 if (adt_audit_state(AUC_DISABLED)) {
354 /* c2audit excluded */
355 *new_session = NULL;
356 return (0);
357 }
358
359 if ((flags & ~flgmask) != 0) {
360 errno = EINVAL;
361 goto return_err;
362 }
363
364 if ((state = calloc(1, sizeof (adt_internal_state_t))) == NULL) {
365 goto return_err;
366 }
367
368 if (adt_init(state, flags & ADT_USE_PROC_DATA) != 0) {
369 goto return_err_free; /* errno from adt_init() */
370 }
371
372 /*
373 * The imported state overwrites the initial state if the
374 * imported state represents a valid audit trail
375 */
376
377 if (imported_state != NULL) {
378 if (adt_import(state, imported_state) != 0) {
379 goto return_err_free;
380 }
381 } else if (flags & ADT_USE_PROC_DATA) {
382 state->as_session_model = ADT_PROCESS_MODEL;
383 }
384 state->as_flags = flags;
385 DPRINTF(("(%lld) Starting session id = %08X\n",
386 (long long) getpid(), state->as_info.ai_asid));
387
388 *new_session = (adt_session_data_t *)state;
389 return (0);
390
391 return_err_free:
392 free(state);
393 return_err:
394 *new_session = NULL;
395 adt_write_syslog("audit session create failed", errno);
396 return (-1);
397 }
398
399 /*
400 * adt_load_table()
401 *
402 * loads the event translation table into the audit session.
403 */
404
405 void
406 adt_load_table(const adt_session_data_t *session_data,
407 adt_translation_t **xlate, void (*preload)(au_event_t, adt_event_data_t *))
408 {
409 adt_internal_state_t *state = (adt_internal_state_t *)session_data;
410
411 if (state != NULL) {
412 assert(state->as_check == ADT_VALID);
413 state->as_xlate = xlate;
414 state->as_preload = preload;
415 }
416 }
417
418 /*
419 * adt_get_asid() and adt_set_asid()
420 *
421 * if you use this interface, you are responsible to insure that the
422 * rest of the session data is populated correctly before calling
423 * adt_proccess_attr()
424 *
425 * neither of these are intended for general use and will likely
426 * remain private interfaces for a long time. Forever is a long
427 * time. In the case of adt_set_asid(), you should have a very,
428 * very good reason for setting your own session id. The process
429 * audit characteristics are not changed by put, use adt_set_proc().
430 *
431 * These are "volatile" (more changable than "evolving") and will
432 * probably change in the S10 period.
433 */
434
435 void
436 adt_get_asid(const adt_session_data_t *session_data, au_asid_t *asid)
437 {
438
439 if (session_data == NULL) {
440 *asid = 0;
441 } else {
442 assert(((adt_internal_state_t *)session_data)->as_check ==
443 ADT_VALID);
444
445 *asid = ((adt_internal_state_t *)session_data)->as_info.ai_asid;
446 }
447 }
448
449 void
450 adt_set_asid(const adt_session_data_t *session_data, const au_asid_t session_id)
451 {
452
453 if (session_data != NULL) {
454 assert(((adt_internal_state_t *)session_data)->as_check ==
455 ADT_VALID);
456
457 ((adt_internal_state_t *)session_data)->as_have_user_data |=
458 ADT_HAVE_ASID;
459 ((adt_internal_state_t *)session_data)->as_info.ai_asid =
460 session_id;
461 }
462 }
463
464 /*
465 * adt_get_auid() and adt_set_auid()
466 *
467 * neither of these are intended for general use and will likely
468 * remain private interfaces for a long time. Forever is a long
469 * time. In the case of adt_set_auid(), you should have a very,
470 * very good reason for setting your own audit id. The process
471 * audit characteristics are not changed by put, use adt_set_proc().
472 */
473
474 void
475 adt_get_auid(const adt_session_data_t *session_data, au_id_t *auid)
476 {
477
478 if (session_data == NULL) {
479 *auid = AU_NOAUDITID;
480 } else {
481 assert(((adt_internal_state_t *)session_data)->as_check ==
482 ADT_VALID);
483
484 *auid = ((adt_internal_state_t *)session_data)->as_info.ai_auid;
485 }
486 }
487
488 void
489 adt_set_auid(const adt_session_data_t *session_data, const au_id_t audit_id)
490 {
491
492 if (session_data != NULL) {
493 assert(((adt_internal_state_t *)session_data)->as_check ==
494 ADT_VALID);
495
496 ((adt_internal_state_t *)session_data)->as_have_user_data |=
497 ADT_HAVE_AUID;
498 ((adt_internal_state_t *)session_data)->as_info.ai_auid =
499 audit_id;
500 }
501 }
502
503 /*
504 * adt_get_termid(), adt_set_termid()
505 *
506 * if you use this interface, you are responsible to insure that the
507 * rest of the session data is populated correctly before calling
508 * adt_proccess_attr()
509 *
510 * The process audit characteristics are not changed by put, use
511 * adt_set_proc().
512 */
513
514 void
515 adt_get_termid(const adt_session_data_t *session_data, au_tid_addr_t *termid)
516 {
517
518 if (session_data == NULL) {
519 (void) memset(termid, 0, sizeof (au_tid_addr_t));
520 termid->at_type = AU_IPv4;
521 } else {
522 assert(((adt_internal_state_t *)session_data)->as_check ==
523 ADT_VALID);
524
525 *termid =
526 ((adt_internal_state_t *)session_data)->as_info.ai_termid;
527 }
528 }
529
530 void
531 adt_set_termid(const adt_session_data_t *session_data,
532 const au_tid_addr_t *termid)
533 {
534
535 if (session_data != NULL) {
536 assert(((adt_internal_state_t *)session_data)->as_check ==
537 ADT_VALID);
538
539 ((adt_internal_state_t *)session_data)->as_info.ai_termid =
540 *termid;
541
542 ((adt_internal_state_t *)session_data)->as_have_user_data |=
543 ADT_HAVE_TID;
544 }
545 }
546
547 /*
548 * adt_get_mask(), adt_set_mask()
549 *
550 * if you use this interface, you are responsible to insure that the
551 * rest of the session data is populated correctly before calling
552 * adt_proccess_attr()
553 *
554 * The process audit characteristics are not changed by put, use
555 * adt_set_proc().
556 */
557
558 void
559 adt_get_mask(const adt_session_data_t *session_data, au_mask_t *mask)
560 {
561
562 if (session_data == NULL) {
563 mask->am_success = 0;
564 mask->am_failure = 0;
565 } else {
566 assert(((adt_internal_state_t *)session_data)->as_check ==
567 ADT_VALID);
568
569 *mask = ((adt_internal_state_t *)session_data)->as_info.ai_mask;
570 }
571 }
572
573 void
574 adt_set_mask(const adt_session_data_t *session_data, const au_mask_t *mask)
575 {
576
577 if (session_data != NULL) {
578 assert(((adt_internal_state_t *)session_data)->as_check ==
579 ADT_VALID);
580
581 ((adt_internal_state_t *)session_data)->as_info.ai_mask = *mask;
582
583 ((adt_internal_state_t *)session_data)->as_have_user_data |=
584 ADT_HAVE_MASK;
585 }
586 }
587
588 /*
589 * helpers for adt_load_termid
590 */
591
592 static dev_t
593 adt_ports_to_at_port(in_port_t remote, in_port_t local)
594 {
595 dev_t port;
596
597 #ifdef _LP64
598 dev_t tmp;
599
600 /*
601 * In 64-bit, at_port is a 64-bit value encoding major/minor
602 * device numbers as 32-bits each. However when a 32-bit application
603 * subsequently requests the audit address via getaudit_addr(), this
604 * value must be capable of being compressed down to a 14-bit major and
605 * 18-bit minor number or the call will fail.
606 *
607 * In order to construct a 32-bit compatible value, the top 14-bits of
608 * the remote port are used for the major number and the remaining
609 * 2-bits + local port are used for the minor.
610 */
611
612 tmp = ((remote<<16) | (local));
613 port = (tmp & MAXMIN32);
614 port |= (((tmp >> NBITSMINOR32) & MAXMAJ32) << NBITSMINOR64);
615 #else
616 port = ((remote<<16) | (local));
617 #endif
618
619 return (port);
620 }
621
622 static void
623 adt_do_ipv6_address(struct sockaddr_in6 *peer, struct sockaddr_in6 *sock,
624 au_tid_addr_t *termid)
625 {
626 termid->at_port =
627 adt_ports_to_at_port(peer->sin6_port, sock->sin6_port);
628 termid->at_type = AU_IPv6;
629 (void) memcpy(termid->at_addr, &peer->sin6_addr, 4 * sizeof (uint_t));
630 }
631
632 static void
633 adt_do_ipv4_address(struct sockaddr_in *peer, struct sockaddr_in *sock,
634 au_tid_addr_t *termid)
635 {
636 termid->at_port = adt_ports_to_at_port(peer->sin_port, sock->sin_port);
637 termid->at_type = AU_IPv4;
638 termid->at_addr[0] = (uint32_t)peer->sin_addr.s_addr;
639 (void) memset(&(termid->at_addr[1]), 0, 3 * sizeof (uint_t));
640 }
641
642 /*
643 * adt_load_termid: convenience function; inputs file handle and
644 * outputs an au_tid_addr struct.
645 *
646 * This code was stolen from audit_settid.c; it differs from audit_settid()
647 * in that it does not write the terminal id to the process.
648 */
649
650 int
651 adt_load_termid(int fd, adt_termid_t **termid)
652 {
653 au_tid_addr_t *p_term;
654 struct sockaddr_in6 peer;
655 struct sockaddr_in6 sock;
656 int peerlen = sizeof (peer);
657 int socklen = sizeof (sock);
658
659 /* get peer name if its a socket, else assume local terminal */
660
661 if (getpeername(fd, (struct sockaddr *)&peer, (socklen_t *)&peerlen)
662 < 0) {
663 if (errno == ENOTSOCK) {
664 return (adt_load_hostname(NULL, termid));
665 }
666 goto return_err;
667 }
668
669 if ((p_term = calloc(1, sizeof (au_tid_addr_t))) == NULL) {
670 goto return_err;
671 }
672
673 /* get sock name */
674 if (getsockname(fd, (struct sockaddr *)&sock,
675 (socklen_t *)&socklen) < 0) {
676 goto return_err_free;
677 }
678
679 if (peer.sin6_family == AF_INET6) {
680 adt_do_ipv6_address(&peer, &sock, p_term);
681 } else {
682 adt_do_ipv4_address((struct sockaddr_in *)&peer,
683 (struct sockaddr_in *)&sock, p_term);
684 }
685 *termid = (adt_termid_t *)p_term;
686
687 return (0);
688
689 return_err_free:
690 free(p_term);
691 return_err:
692 *termid = NULL;
693 return (-1);
694 }
695
696 static boolean_t
697 adt_have_termid(au_tid_addr_t *dest)
698 {
699 struct auditinfo_addr audit_data;
700
701 if (getaudit_addr(&audit_data, sizeof (audit_data)) < 0) {
702 adt_write_syslog("getaudit failed", errno);
703 return (B_FALSE);
704 }
705
706 if ((audit_data.ai_termid.at_type == 0) ||
707 (audit_data.ai_termid.at_addr[0] |
708 audit_data.ai_termid.at_addr[1] |
709 audit_data.ai_termid.at_addr[2] |
710 audit_data.ai_termid.at_addr[3]) == 0)
711 return (B_FALSE);
712
713 (void) memcpy(dest, &(audit_data.ai_termid),
714 sizeof (au_tid_addr_t));
715
716 return (B_TRUE);
717 }
718
719 /*
720 * adt_get_hostIP - construct a terminal id from a hostname
721 *
722 * Returns 0 = success
723 * -1 = failure and errno = ENETDOWN with the address
724 * defaulted to IPv4 loopback.
725 */
726
727 static int
728 adt_get_hostIP(const char *hostname, au_tid_addr_t *p_term)
729 {
730 struct addrinfo *ai = NULL;
731 int tries = 3;
732 char msg[512];
733 int eai_err;
734
735 while ((tries-- > 0) &&
736 ((eai_err = getaddrinfo(hostname, NULL, NULL, &ai)) != 0)) {
737 /*
738 * getaddrinfo returns its own set of errors.
739 * Log them here, so any subsequent syslogs will
740 * have a context. adt_get_hostIP callers can only
741 * return errno, so subsequent syslogs may be lacking
742 * that getaddrinfo failed.
743 */
744 (void) snprintf(msg, sizeof (msg), "getaddrinfo(%s) "
745 "failed[%s]", hostname, gai_strerror(eai_err));
746 adt_write_syslog(msg, 0);
747
748 if (eai_err != EAI_AGAIN) {
749
750 break;
751 }
752 /* see if resolution becomes available */
753 (void) sleep(1);
754 }
755 if (ai != NULL) {
756 if (ai->ai_family == AF_INET) {
757 p_term->at_type = AU_IPv4;
758 (void) memcpy(p_term->at_addr,
759 /* LINTED */
760 &((struct sockaddr_in *)ai->ai_addr)->sin_addr,
761 AU_IPv4);
762 } else {
763 p_term->at_type = AU_IPv6;
764 (void) memcpy(p_term->at_addr,
765 /* LINTED */
766 &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr,
767 AU_IPv6);
768 }
769 freeaddrinfo(ai);
770 return (0);
771 } else if (auditstate & (AUC_AUDITING | AUC_NOSPACE)) {
772 auditinfo_addr_t audit_info;
773
774 /*
775 * auditd is running so there should be a
776 * kernel audit context
777 */
778 if (auditon(A_GETKAUDIT, (caddr_t)&audit_info,
779 sizeof (audit_info)) < 0) {
780 adt_write_syslog("unable to get kernel audit context",
781 errno);
782 goto try_interface;
783 }
784 adt_write_syslog("setting Audit IP address to kernel", 0);
785 *p_term = audit_info.ai_termid;
786 return (0);
787 }
788 try_interface:
789 {
790 struct ifaddrlist al;
791 int family;
792 char ntop[INET6_ADDRSTRLEN];
793
794 /*
795 * getaddrinfo has failed to map the hostname
796 * to an IP address, try to get an IP address
797 * from a local interface. If none up, default
798 * to loopback.
799 */
800 family = AF_INET6;
801 if (adt_get_local_address(family, &al) != 0) {
802 family = AF_INET;
803
804 if (adt_get_local_address(family, &al) != 0) {
805 adt_write_syslog("adt_get_local_address "
806 "failed, no Audit IP address available, "
807 "faking loopback and error",
808 errno);
809 IN_SET_LOOPBACK_ADDR(
810 (struct sockaddr_in *)&(al.addr.addr));
811 (void) memcpy(p_term->at_addr, &al.addr.addr,
812 AU_IPv4);
813 p_term->at_type = AU_IPv4;
814 return (-1);
815 }
816 }
817 if (family == AF_INET) {
818 p_term->at_type = AU_IPv4;
819 (void) memcpy(p_term->at_addr, &al.addr.addr, AU_IPv4);
820 } else {
821 p_term->at_type = AU_IPv6;
822 (void) memcpy(p_term->at_addr, &al.addr.addr6, AU_IPv6);
823 }
824
825 (void) snprintf(msg, sizeof (msg), "mapping %s to %s",
826 hostname, inet_ntop(family, &(al.addr), ntop,
827 sizeof (ntop)));
828 adt_write_syslog(msg, 0);
829 return (0);
830 }
831 }
832
833 /*
834 * adt_load_hostname() is called when the caller does not have a file
835 * handle that gives access to the socket info or any other way to
836 * pass in both port and ip address. The hostname input is ignored if
837 * the terminal id has already been set; instead it returns the
838 * existing terminal id.
839 *
840 * If c2audit is excluded, success is returned.
841 * If the hostname lookup fails, the loopback address is assumed,
842 * errno is set to ENETDOWN, this allows the caller to interpret
843 * whether failure is fatal, and if not to have a address for the
844 * hostname.
845 * Otherwise the caller would need to be aware of the audit state.
846 *
847 * Other errors are ignored if not auditing.
848 */
849
850 int
851 adt_load_hostname(const char *hostname, adt_termid_t **termid)
852 {
853 char localhost[MAXHOSTNAMELEN + 1];
854 au_tid_addr_t *p_term;
855
856 if (adt_audit_state(AUC_DISABLED)) {
857 /* c2audit excluded */
858 *termid = NULL;
859 return (0);
860 }
861
862 if ((p_term = calloc(1, sizeof (au_tid_addr_t))) == NULL) {
863 goto return_err;
864 }
865
866 if (adt_have_termid(p_term)) {
867 *termid = (adt_termid_t *)p_term;
868 return (0);
869 }
870 p_term->at_port = 0;
871
872 if (hostname == NULL || *hostname == '\0') {
873 (void) sysinfo(SI_HOSTNAME, localhost, MAXHOSTNAMELEN);
874 hostname = localhost;
875 }
876 if (adt_get_hostIP(hostname, p_term) == 0) {
877 *termid = (adt_termid_t *)p_term;
878 return (0);
879 } else {
880 *termid = (adt_termid_t *)p_term;
881 return (-1);
882 }
883
884 return_err:
885 *termid = NULL;
886 if (auditstate & AUC_NOAUDIT) {
887 return (0);
888 }
889
890 return (-1);
891 }
892
893 /*
894 * adt_load_ttyname() is called when the caller does not have a file
895 * handle that gives access to the local terminal or any other way
896 * of determining the device id. The ttyname input is ignored if
897 * the terminal id has already been set; instead it returns the
898 * existing terminal id.
899 *
900 * If c2audit is excluded, success is returned.
901 * The local hostname is used for the local IP address.
902 * If that hostname lookup fails, the loopback address is assumed,
903 * errno is set to ENETDOWN, this allows the caller to interpret
904 * whether failure is fatal, and if not to have a address for the
905 * hostname.
906 * Otherwise the caller would need to be aware of the audit state.
907 *
908 * Other errors are ignored if not auditing.
909 */
910
911 int
912 adt_load_ttyname(const char *ttyname, adt_termid_t **termid)
913 {
914 char localhost[MAXHOSTNAMELEN + 1];
915 au_tid_addr_t *p_term;
916 struct stat stat_buf;
917
918 if (adt_audit_state(AUC_DISABLED)) {
919 /* c2audit excluded */
920 *termid = NULL;
921 return (0);
922 }
923
924 if ((p_term = calloc(1, sizeof (au_tid_addr_t))) == NULL) {
925 goto return_err;
926 }
927
928 if (adt_have_termid(p_term)) {
929 *termid = (adt_termid_t *)p_term;
930 return (0);
931 }
932
933 p_term->at_port = 0;
934
935 if (sysinfo(SI_HOSTNAME, localhost, MAXHOSTNAMELEN) < 0) {
936 goto return_err_free; /* errno from sysinfo */
937 }
938
939 if (ttyname != NULL && *ttyname != '\0') {
940 if (stat(ttyname, &stat_buf) < 0) {
941 goto return_err_free;
942 }
943
944 p_term->at_port = stat_buf.st_rdev;
945 }
946
947 if (adt_get_hostIP(localhost, p_term) == 0) {
948 *termid = (adt_termid_t *)p_term;
949 return (0);
950 } else {
951 *termid = (adt_termid_t *)p_term;
952 return (-1);
953 }
954
955 return_err_free:
956 free(p_term);
957
958 return_err:
959 *termid = NULL;
960 if (auditstate & AUC_NOAUDIT) {
961 return (0);
962 }
963
964 return (-1);
965 }
966
967 /*
968 * adt_get_session_id returns a stringified representation of
969 * the audit session id. See also adt_get_asid() for how to
970 * get the unexpurgated version. No guarantees as to how long
971 * the returned string will be or its general form; hex for now.
972 *
973 * An empty string is returned if auditing is off; length = 1
974 * and the pointer is valid.
975 *
976 * returns strlen + 1 if buffer is valid; else 0 and errno.
977 */
978
979 size_t
980 adt_get_session_id(const adt_session_data_t *session_data, char **buff)
981 {
982 au_asid_t session_id;
983 size_t length;
984 /*
985 * output is 0x followed by
986 * two characters per byte
987 * plus terminator,
988 * except leading 0's are suppressed, so a few bytes may
989 * be unused.
990 */
991 length = 2 + (2 * sizeof (session_id)) + 1;
992 *buff = malloc(length);
993
994 if (*buff == NULL) {
995 return (0);
996 }
997 if (session_data == NULL) { /* NULL is not an error */
998 **buff = '\0';
999 return (1);
1000 }
1001 adt_get_asid(session_data, &session_id);
1002
1003 length = snprintf(*buff, length, "0x%X", (int)session_id);
1004
1005 /* length < 1 is a bug: the session data type may have changed */
1006 assert(length > 0);
1007
1008 return (length);
1009 }
1010
1011 /*
1012 * adt_end_session -- close handle, clear context
1013 *
1014 * if as_check is invalid, no harm, no foul, EXCEPT that this could
1015 * be an attempt to free data already free'd, so output to syslog
1016 * to help explain why the process cored dumped.
1017 */
1018
1019 int
1020 adt_end_session(adt_session_data_t *session_data)
1021 {
1022 adt_internal_state_t *state;
1023
1024 if (session_data != NULL) {
1025 state = (adt_internal_state_t *)session_data;
1026 if (state->as_check != ADT_VALID) {
1027 adt_write_syslog("freeing invalid data", EINVAL);
1028 } else {
1029 state->as_check = 0;
1030 m_label_free(state->as_label);
1031 free(session_data);
1032 }
1033 }
1034 /* no errors yet defined */
1035 return (0);
1036 }
1037
1038 /*
1039 * adt_dup_session -- copy the session data
1040 */
1041
1042 int
1043 adt_dup_session(const adt_session_data_t *source, adt_session_data_t **dest)
1044 {
1045 adt_internal_state_t *source_state;
1046 adt_internal_state_t *dest_state = NULL;
1047 int rc = 0;
1048
1049 if (source != NULL) {
1050 source_state = (adt_internal_state_t *)source;
1051 assert(source_state->as_check == ADT_VALID);
1052
1053 dest_state = malloc(sizeof (adt_internal_state_t));
1054 if (dest_state == NULL) {
1055 rc = -1;
1056 goto return_rc;
1057 }
1058 (void) memcpy(dest_state, source,
1059 sizeof (struct adt_internal_state));
1060
1061 if (source_state->as_label != NULL) {
1062 dest_state->as_label = NULL;
1063 if ((rc = m_label_dup(&dest_state->as_label,
1064 source_state->as_label)) != 0) {
1065 free(dest_state);
1066 dest_state = NULL;
1067 }
1068 }
1069 }
1070 return_rc:
1071 *dest = (adt_session_data_t *)dest_state;
1072 return (rc);
1073 }
1074
1075 /*
1076 * from_export_format()
1077 * read from a network order buffer into struct adt_session_data
1078 */
1079
1080 static size_t
1081 adt_from_export_format(adt_internal_state_t *internal,
1082 const adt_export_data_t *external)
1083 {
1084 struct export_header head;
1085 struct export_link link;
1086 adr_t context;
1087 int32_t offset;
1088 int32_t length;
1089 int32_t version;
1090 size_t label_len;
1091 char *p = (char *)external;
1092
1093 adrm_start(&context, (char *)external);
1094 adrm_int32(&context, (int *)&head, 4);
1095
1096 if ((internal->as_check = head.ax_check) != ADT_VALID) {
1097 errno = EINVAL;
1098 return (0);
1099 }
1100 offset = head.ax_link.ax_offset;
1101 version = head.ax_link.ax_version;
1102 length = head.ax_buffer_length;
1103
1104 /*
1105 * Skip newer versions.
1106 */
1107 while (version > PROTOCOL_VERSION_2) {
1108 if (offset < 1) {
1109 return (0); /* failed to match version */
1110 }
1111 p += offset; /* point to next version # */
1112
1113 if (p > (char *)external + length) {
1114 return (0);
1115 }
1116 adrm_start(&context, p);
1117 adrm_int32(&context, (int *)&link, 2);
1118 offset = link.ax_offset;
1119 version = link.ax_version;
1120 assert(version != 0);
1121 }
1122 /*
1123 * Adjust buffer pointer to the first data item (euid).
1124 */
1125 if (p == (char *)external) {
1126 adrm_start(&context, (char *)(p + sizeof (head)));
1127 } else {
1128 adrm_start(&context, (char *)(p + sizeof (link)));
1129 }
1130 /*
1131 * if down rev version, neither pid nor label are included
1132 * in v1 ax_size_of_tsol_data intentionally ignored
1133 */
1134 if (version == PROTOCOL_VERSION_1) {
1135 adrm_int32(&context, (int *)&(internal->as_euid), 1);
1136 adrm_int32(&context, (int *)&(internal->as_ruid), 1);
1137 adrm_int32(&context, (int *)&(internal->as_egid), 1);
1138 adrm_int32(&context, (int *)&(internal->as_rgid), 1);
1139 adrm_int32(&context, (int *)&(internal->as_info.ai_auid), 1);
1140 adrm_int32(&context,
1141 (int *)&(internal->as_info.ai_mask.am_success), 2);
1142 adrm_int32(&context,
1143 (int *)&(internal->as_info.ai_termid.at_port), 1);
1144 adrm_int32(&context,
1145 (int *)&(internal->as_info.ai_termid.at_type), 1);
1146 adrm_int32(&context,
1147 (int *)&(internal->as_info.ai_termid.at_addr[0]), 4);
1148 adrm_int32(&context, (int *)&(internal->as_info.ai_asid), 1);
1149 adrm_int32(&context, (int *)&(internal->as_audit_state), 1);
1150 internal->as_pid = (pid_t)-1;
1151 internal->as_label = NULL;
1152 } else if (version == PROTOCOL_VERSION_2) {
1153 adrm_int32(&context, (int *)&(internal->as_euid), 1);
1154 adrm_int32(&context, (int *)&(internal->as_ruid), 1);
1155 adrm_int32(&context, (int *)&(internal->as_egid), 1);
1156 adrm_int32(&context, (int *)&(internal->as_rgid), 1);
1157 adrm_int32(&context, (int *)&(internal->as_info.ai_auid), 1);
1158 adrm_int32(&context,
1159 (int *)&(internal->as_info.ai_mask.am_success), 2);
1160 adrm_int32(&context,
1161 (int *)&(internal->as_info.ai_termid.at_port), 1);
1162 adrm_int32(&context,
1163 (int *)&(internal->as_info.ai_termid.at_type), 1);
1164 adrm_int32(&context,
1165 (int *)&(internal->as_info.ai_termid.at_addr[0]), 4);
1166 adrm_int32(&context, (int *)&(internal->as_info.ai_asid), 1);
1167 adrm_int32(&context, (int *)&(internal->as_audit_state), 1);
1168 adrm_int32(&context, (int *)&(internal->as_pid), 1);
1169 adrm_int32(&context, (int *)&label_len, 1);
1170 if (label_len > 0) {
1171 /* read in and deal with different sized labels. */
1172 size32_t my_label_len = blabel_size();
1173
1174 if ((internal->as_label =
1175 m_label_alloc(MAC_LABEL)) == NULL) {
1176 return (0);
1177 }
1178 if (label_len > my_label_len) {
1179 errno = EINVAL;
1180 m_label_free(internal->as_label);
1181 return (0);
1182 }
1183 (void) memset(internal->as_label, 0, my_label_len);
1184 adrm_int32(&context, (int *)(internal->as_label),
1185 label_len / sizeof (int32_t));
1186 } else {
1187 internal->as_label = NULL;
1188 }
1189 }
1190
1191 return (length);
1192 }
1193
1194 /*
1195 * adt_to_export_format
1196 * read from struct adt_session_data into a network order buffer.
1197 *
1198 * (network order 'cause this data may be shared with a remote host.)
1199 */
1200
1201 static size_t
1202 adt_to_export_format(adt_export_data_t *external,
1203 adt_internal_state_t *internal)
1204 {
1205 struct export_header head;
1206 struct export_link tail;
1207 adr_t context;
1208 size32_t label_len = 0;
1209
1210 adrm_start(&context, (char *)external);
1211
1212 if (internal->as_label != NULL) {
1213 label_len = blabel_size();
1214 }
1215
1216 head.ax_check = ADT_VALID;
1217 head.ax_buffer_length = sizeof (struct adt_export_data) + label_len;
1218
1219 /* version 2 first */
1220
1221 head.ax_link.ax_version = PROTOCOL_VERSION_2;
1222 head.ax_link.ax_offset = sizeof (struct export_header) +
1223 sizeof (struct adt_export_v2) + label_len;
1224
1225 adrm_putint32(&context, (int *)&head, 4);
1226
1227 adrm_putint32(&context, (int *)&(internal->as_euid), 1);
1228 adrm_putint32(&context, (int *)&(internal->as_ruid), 1);
1229 adrm_putint32(&context, (int *)&(internal->as_egid), 1);
1230 adrm_putint32(&context, (int *)&(internal->as_rgid), 1);
1231 adrm_putint32(&context, (int *)&(internal->as_info.ai_auid), 1);
1232 adrm_putint32(&context,
1233 (int *)&(internal->as_info.ai_mask.am_success), 2);
1234 adrm_putint32(&context,
1235 (int *)&(internal->as_info.ai_termid.at_port), 1);
1236 adrm_putint32(&context,
1237 (int *)&(internal->as_info.ai_termid.at_type), 1);
1238 adrm_putint32(&context,
1239 (int *)&(internal->as_info.ai_termid.at_addr[0]), 4);
1240 adrm_putint32(&context, (int *)&(internal->as_info.ai_asid), 1);
1241 adrm_putint32(&context, (int *)&(internal->as_audit_state), 1);
1242 adrm_putint32(&context, (int *)&(internal->as_pid), 1);
1243 adrm_putint32(&context, (int *)&label_len, 1);
1244 if (internal->as_label != NULL) {
1245 /* serialize the label */
1246 adrm_putint32(&context, (int *)(internal->as_label),
1247 (label_len / sizeof (int32_t)));
1248 }
1249
1250 /* now version 1 */
1251
1252 tail.ax_version = PROTOCOL_VERSION_1;
1253 tail.ax_offset = 0;
1254
1255 adrm_putint32(&context, (int *)&tail, 2);
1256
1257 adrm_putint32(&context, (int *)&(internal->as_euid), 1);
1258 adrm_putint32(&context, (int *)&(internal->as_ruid), 1);
1259 adrm_putint32(&context, (int *)&(internal->as_egid), 1);
1260 adrm_putint32(&context, (int *)&(internal->as_rgid), 1);
1261 adrm_putint32(&context, (int *)&(internal->as_info.ai_auid), 1);
1262 adrm_putint32(&context,
1263 (int *)&(internal->as_info.ai_mask.am_success), 2);
1264 adrm_putint32(&context,
1265 (int *)&(internal->as_info.ai_termid.at_port), 1);
1266 adrm_putint32(&context,
1267 (int *)&(internal->as_info.ai_termid.at_type), 1);
1268 adrm_putint32(&context,
1269 (int *)&(internal->as_info.ai_termid.at_addr[0]), 4);
1270 adrm_putint32(&context, (int *)&(internal->as_info.ai_asid), 1);
1271 adrm_putint32(&context, (int *)&(internal->as_audit_state), 1);
1272 /* ignored in v1 */
1273 adrm_putint32(&context, (int *)&label_len, 1);
1274
1275 /* finally terminator */
1276
1277 tail.ax_version = 0; /* invalid version number */
1278 tail.ax_offset = 0;
1279
1280 adrm_putint32(&context, (int *)&tail, 2);
1281
1282 return (head.ax_buffer_length);
1283 }
1284
1285 /*
1286 * adt_ucred_label() -- if label is available, duplicate it.
1287 */
1288
1289 static m_label_t *
1290 adt_ucred_label(ucred_t *uc)
1291 {
1292 m_label_t *ul = NULL;
1293
1294 if (ucred_getlabel(uc) != NULL) {
1295 (void) m_label_dup(&ul, ucred_getlabel(uc));
1296 }
1297
1298 return (ul);
1299 }
1300
1301 /*
1302 * adt_import() -- convert from network order to machine-specific order
1303 */
1304
1305 static int
1306 adt_import(adt_internal_state_t *internal, const adt_export_data_t *external)
1307 {
1308 au_mask_t mask;
1309
1310 /* save local audit state */
1311 int local_audit_state = internal->as_audit_state;
1312
1313 if (adt_from_export_format(internal, external) < 1)
1314 return (-1); /* errno from adt_from_export_format */
1315
1316 /*
1317 * If audit isn't enabled on the remote, they were unable
1318 * to generate the audit mask, so generate it based on
1319 * local configuration. If the user id has changed, the
1320 * resulting mask may miss some subtleties that occurred
1321 * on the remote system.
1322 *
1323 * If the remote failed to generate a terminal id, it is not
1324 * recoverable.
1325 */
1326
1327 if (!(internal->as_audit_state & AUC_DISABLED)) {
1328 if (adt_get_mask_from_user(internal->as_info.ai_auid,
1329 &(internal->as_info.ai_mask)))
1330 return (-1);
1331 if (internal->as_info.ai_auid != internal->as_ruid) {
1332 if (adt_get_mask_from_user(internal->as_info.ai_auid,
1333 &mask))
1334 return (-1);
1335 internal->as_info.ai_mask.am_success |=
1336 mask.am_success;
1337 internal->as_info.ai_mask.am_failure |=
1338 mask.am_failure;
1339 }
1340 }
1341 internal->as_audit_state = local_audit_state;
1342
1343 DPRINTF(("(%lld)imported asid = %X %u\n", (long long) getpid(),
1344 internal->as_info.ai_asid,
1345 internal->as_info.ai_asid));
1346
1347 internal->as_have_user_data = ADT_HAVE_ALL;
1348
1349 return (0);
1350 }
1351
1352 /*
1353 * adt_export_session_data()
1354 * copies a adt_session_data struct into a network order buffer
1355 *
1356 * In a misconfigured network, the local host may have auditing
1357 * off while the destination may have auditing on, so if there
1358 * is sufficient memory, a buffer will be returned even in the
1359 * audit off case.
1360 */
1361
1362 size_t
1363 adt_export_session_data(const adt_session_data_t *internal,
1364 adt_export_data_t **external)
1365 {
1366 size32_t length = 0;
1367
1368 if ((internal != NULL) &&
1369 ((adt_internal_state_t *)internal)->as_label != NULL) {
1370 length = blabel_size();
1371 }
1372
1373 *external = malloc(sizeof (adt_export_data_t) + length);
1374
1375 if (*external == NULL)
1376 return (0);
1377
1378 if (internal == NULL) {
1379 adt_internal_state_t *dummy;
1380
1381 dummy = malloc(sizeof (adt_internal_state_t));
1382 if (dummy == NULL)
1383 goto return_length_free;
1384
1385 if (adt_init(dummy, 0)) { /* 0 == don't copy from proc */
1386 free(dummy);
1387 goto return_length_free;
1388 }
1389 length = adt_to_export_format(*external, dummy);
1390 free(dummy);
1391 } else {
1392 length = adt_to_export_format(*external,
1393 (adt_internal_state_t *)internal);
1394 }
1395 return (length);
1396
1397 return_length_free:
1398 free(*external);
1399 *external = NULL;
1400 return (0);
1401 }
1402
1403 static void
1404 adt_setto_unaudited(adt_internal_state_t *state)
1405 {
1406 if (state->as_audit_state & AUC_DISABLED) {
1407 state->as_ruid = AU_NOAUDITID;
1408 state->as_euid = AU_NOAUDITID;
1409 state->as_rgid = AU_NOAUDITID;
1410 state->as_egid = AU_NOAUDITID;
1411 state->as_pid = (pid_t)-1;
1412 state->as_label = NULL;
1413 } else {
1414 state->as_info.ai_asid = 0;
1415 state->as_info.ai_auid = AU_NOAUDITID;
1416
1417 (void) memset((void *)&(state->as_info.ai_termid), 0,
1418 sizeof (au_tid_addr_t));
1419 state->as_info.ai_termid.at_type = AU_IPv4;
1420
1421 (void) memset((void *)&(state->as_info.ai_mask), 0,
1422 sizeof (au_mask_t));
1423 state->as_have_user_data = 0;
1424 }
1425 }
1426
1427 /*
1428 * adt_init -- set session context by copying the audit characteristics
1429 * from the proc and picking up current uid/tid information.
1430 *
1431 * By default, an audit session is based on the process; the default
1432 * is overriden by adt_set_user()
1433 */
1434
1435 static int
1436 adt_init(adt_internal_state_t *state, int use_proc_data)
1437 {
1438 /* ensure auditstate is set */
1439
1440 (void) adt_audit_state(0);
1441 state->as_audit_state = auditstate;
1442
1443 if (use_proc_data) {
1444 state->as_ruid = getuid();
1445 state->as_euid = geteuid();
1446 state->as_rgid = getgid();
1447 state->as_egid = getegid();
1448 state->as_pid = getpid();
1449
1450 if (!(state->as_audit_state & AUC_DISABLED)) {
1451 const au_tid64_addr_t *tid;
1452 const au_mask_t *mask;
1453 ucred_t *ucred = ucred_get(P_MYID);
1454
1455 /*
1456 * Even if the ucred is NULL, the underlying
1457 * credential may have a valid terminal id; if the
1458 * terminal id is set, then that's good enough. An
1459 * example of where this matters is failed login,
1460 * where rlogin/telnet sets the terminal id before
1461 * calling login; login does not load the credential
1462 * since auth failed.
1463 */
1464 if (ucred == NULL) {
1465 if (!adt_have_termid(
1466 &(state->as_info.ai_termid)))
1467 return (-1);
1468 } else {
1469 mask = ucred_getamask(ucred);
1470 if (mask != NULL) {
1471 state->as_info.ai_mask = *mask;
1472 } else {
1473 ucred_free(ucred);
1474 return (-1);
1475 }
1476 tid = ucred_getatid(ucred);
1477 if (tid != NULL) {
1478 adt_cpy_tid(&(state->as_info.ai_termid),
1479 tid);
1480 } else {
1481 ucred_free(ucred);
1482 return (-1);
1483 }
1484 state->as_info.ai_asid = ucred_getasid(ucred);
1485 state->as_info.ai_auid = ucred_getauid(ucred);
1486 state->as_label = adt_ucred_label(ucred);
1487 ucred_free(ucred);
1488 }
1489 state->as_have_user_data = ADT_HAVE_ALL;
1490 }
1491 } else {
1492 adt_setto_unaudited(state);
1493 }
1494 state->as_session_model = ADT_SESSION_MODEL; /* default */
1495
1496 if ((state->as_audit_state & (AUC_AUDITING | AUC_NOSPACE)) &&
1497 auditon(A_GETPOLICY, (caddr_t)&(state->as_kernel_audit_policy),
1498 sizeof (state->as_kernel_audit_policy))) {
1499 return (-1); /* errno set by auditon */
1500 }
1501 state->as_check = ADT_VALID;
1502 adt_load_table((adt_session_data_t *)state, &adt_xlate_table[0],
1503 &adt_preload);
1504 return (0);
1505 }
1506
1507 /*
1508 * adt_set_proc
1509 *
1510 * Copy the current session state to the process. If this function
1511 * is called, the model becomes a process model rather than a
1512 * session model.
1513 *
1514 * In the current implementation, the value state->as_have_user_data
1515 * must contain all of: ADT_HAVE_{AUID,MASK,TID,ASID}. These are all set
1516 * by adt_set_user() when the ADT_SETTID or ADT_NEW flag is passed in.
1517 *
1518 */
1519
1520 int
1521 adt_set_proc(const adt_session_data_t *session_data)
1522 {
1523 adt_internal_state_t *state;
1524
1525 if (session_data == NULL) {
1526 return (0);
1527 }
1528
1529 state = (adt_internal_state_t *)session_data;
1530
1531 assert(state->as_check == ADT_VALID);
1532
1533 if ((state->as_have_user_data & (ADT_HAVE_ALL & ~ADT_HAVE_IDS)) !=
1534 (ADT_HAVE_ALL & ~ADT_HAVE_IDS)) {
1535 errno = EINVAL;
1536 goto return_err;
1537 }
1538
1539 if (setaudit_addr((auditinfo_addr_t *)&(state->as_info),
1540 sizeof (auditinfo_addr_t)) < 0) {
1541 goto return_err; /* errno set by setaudit_addr() */
1542 }
1543
1544 state->as_session_model = ADT_PROCESS_MODEL;
1545
1546 return (0);
1547
1548 return_err:
1549 adt_write_syslog("failed to set process audit characteristics", errno);
1550 return (-1);
1551 }
1552
1553 static int
1554 adt_newuser(adt_internal_state_t *state, uid_t ruid, au_tid_addr_t *termid)
1555 {
1556 au_tid_addr_t no_tid = {0, AU_IPv4, 0, 0, 0, 0};
1557 au_mask_t no_mask = {0, 0};
1558
1559 if (ruid == ADT_NO_AUDIT) {
1560 state->as_info.ai_auid = AU_NOAUDITID;
1561 state->as_info.ai_asid = 0;
1562 state->as_info.ai_termid = no_tid;
1563 state->as_info.ai_mask = no_mask;
1564 return (0);
1565 }
1566 state->as_info.ai_auid = ruid;
1567 state->as_info.ai_asid = adt_get_unique_id(ruid);
1568 if (termid != NULL)
1569 state->as_info.ai_termid = *termid;
1570
1571 if (adt_get_mask_from_user(ruid, &(state->as_info.ai_mask)))
1572 return (-1);
1573
1574 /* Assume intending to audit as this process */
1575
1576 if (state->as_pid == (pid_t)-1)
1577 state->as_pid = getpid();
1578
1579 if (is_system_labeled() && state->as_label == NULL) {
1580 ucred_t *ucred = ucred_get(P_MYID);
1581
1582 state->as_label = adt_ucred_label(ucred);
1583 ucred_free(ucred);
1584 }
1585
1586 return (0);
1587 }
1588
1589 static int
1590 adt_changeuser(adt_internal_state_t *state, uid_t ruid)
1591 {
1592 au_mask_t mask;
1593
1594 if (!(state->as_have_user_data & ADT_HAVE_AUID))
1595 state->as_info.ai_auid = ruid;
1596 if (!(state->as_have_user_data & ADT_HAVE_ASID))
1597 state->as_info.ai_asid = adt_get_unique_id(ruid);
1598
1599 if (ruid <= MAXEPHUID) {
1600 if (adt_get_mask_from_user(ruid, &mask))
1601 return (-1);
1602
1603 state->as_info.ai_mask.am_success |= mask.am_success;
1604 state->as_info.ai_mask.am_failure |= mask.am_failure;
1605 }
1606 DPRINTF(("changed mask to %08X/%08X for ruid=%d\n",
1607 state->as_info.ai_mask.am_success,
1608 state->as_info.ai_mask.am_failure,
1609 ruid));
1610 return (0);
1611 }
1612
1613 /*
1614 * adt_set_user -- see also adt_set_from_ucred()
1615 *
1616 * ADT_NO_ATTRIB is a valid uid/gid meaning "not known" or
1617 * "unattributed." If ruid, change the model to session.
1618 *
1619 * ADT_NO_CHANGE is a valid uid/gid meaning "do not change this value"
1620 * only valid with ADT_UPDATE.
1621 *
1622 * ADT_NO_AUDIT is the external equivalent to AU_NOAUDITID -- there
1623 * isn't a good reason to call adt_set_user() with it unless you don't
1624 * have a good value yet and intend to replace it later; auid will be
1625 * AU_NOAUDITID.
1626 *
1627 * adt_set_user should be called even if auditing is not enabled
1628 * so that adt_export_session_data() will have useful stuff to
1629 * work with.
1630 *
1631 * See the note preceding adt_set_proc() about the use of ADT_HAVE_TID
1632 * and ADT_HAVE_ALL.
1633 */
1634
1635 int
1636 adt_set_user(const adt_session_data_t *session_data, uid_t euid, gid_t egid,
1637 uid_t ruid, gid_t rgid, const adt_termid_t *termid,
1638 enum adt_user_context user_context)
1639 {
1640 adt_internal_state_t *state;
1641 int rc;
1642
1643 if (session_data == NULL) /* no session exists to audit */
1644 return (0);
1645
1646 state = (adt_internal_state_t *)session_data;
1647 assert(state->as_check == ADT_VALID);
1648
1649 switch (user_context) {
1650 case ADT_NEW:
1651 if (ruid == ADT_NO_CHANGE || euid == ADT_NO_CHANGE ||
1652 rgid == ADT_NO_CHANGE || egid == ADT_NO_CHANGE) {
1653 errno = EINVAL;
1654 return (-1);
1655 }
1656 if ((rc = adt_newuser(state, ruid,
1657 (au_tid_addr_t *)termid)) != 0)
1658 return (rc);
1659
1660 state->as_have_user_data = ADT_HAVE_ALL;
1661 break;
1662 case ADT_UPDATE:
1663 if (state->as_have_user_data != ADT_HAVE_ALL) {
1664 errno = EINVAL;
1665 return (-1);
1666 }
1667
1668 if (ruid != ADT_NO_CHANGE)
1669 if ((rc = adt_changeuser(state, ruid)) != 0)
1670 return (rc);
1671 break;
1672 case ADT_USER:
1673 if (state->as_have_user_data != ADT_HAVE_ALL) {
1674 errno = EINVAL;
1675 return (-1);
1676 }
1677 break;
1678 case ADT_SETTID:
1679 assert(termid != NULL);
1680 state->as_info.ai_termid = *((au_tid_addr_t *)termid);
1681 /* avoid fooling pam_setcred()... */
1682 state->as_info.ai_auid = AU_NOAUDITID;
1683 state->as_info.ai_asid = 0;
1684 state->as_info.ai_mask.am_failure = 0;
1685 state->as_info.ai_mask.am_success = 0;
1686 state->as_have_user_data = ADT_HAVE_TID |
1687 ADT_HAVE_AUID | ADT_HAVE_ASID | ADT_HAVE_MASK;
1688 return (0);
1689 default:
1690 errno = EINVAL;
1691 return (-1);
1692 }
1693
1694 if (ruid == ADT_NO_AUDIT) {
1695 state->as_ruid = AU_NOAUDITID;
1696 state->as_euid = AU_NOAUDITID;
1697 state->as_rgid = AU_NOAUDITID;
1698 state->as_egid = AU_NOAUDITID;
1699 } else {
1700 if (ruid != ADT_NO_CHANGE)
1701 state->as_ruid = ruid;
1702 if (euid != ADT_NO_CHANGE)
1703 state->as_euid = euid;
1704 if (rgid != ADT_NO_CHANGE)
1705 state->as_rgid = rgid;
1706 if (egid != ADT_NO_CHANGE)
1707 state->as_egid = egid;
1708 }
1709
1710 if (ruid == ADT_NO_ATTRIB) {
1711 state->as_session_model = ADT_SESSION_MODEL;
1712 }
1713
1714 return (0);
1715 }
1716
1717 /*
1718 * adt_set_from_ucred()
1719 *
1720 * an alternate to adt_set_user that fills the same role but uses
1721 * a pointer to a ucred rather than a list of id's. If the ucred
1722 * pointer is NULL, use the credential from the this process.
1723 *
1724 * A key difference is that for ADT_NEW, adt_set_from_ucred() does
1725 * not overwrite the asid and auid unless auid has not been set.
1726 * ADT_NEW differs from ADT_UPDATE in that it does not OR together
1727 * the incoming audit mask with the one that already exists.
1728 *
1729 * adt_set_from_ucred should be called even if auditing is not enabled
1730 * so that adt_export_session_data() will have useful stuff to
1731 * work with.
1732 */
1733
1734 int
1735 adt_set_from_ucred(const adt_session_data_t *session_data, const ucred_t *uc,
1736 enum adt_user_context user_context)
1737 {
1738 adt_internal_state_t *state;
1739 int rc = -1;
1740 const au_tid64_addr_t *tid64;
1741 au_tid_addr_t termid, *tid;
1742 ucred_t *ucred = (ucred_t *)uc;
1743 boolean_t local_uc = B_FALSE;
1744
1745 if (session_data == NULL) /* no session exists to audit */
1746 return (0);
1747
1748 state = (adt_internal_state_t *)session_data;
1749 assert(state->as_check == ADT_VALID);
1750
1751 if (ucred == NULL) {
1752 ucred = ucred_get(P_MYID);
1753
1754 if (ucred == NULL)
1755 goto return_rc;
1756 local_uc = B_TRUE;
1757 }
1758
1759 switch (user_context) {
1760 case ADT_NEW:
1761 tid64 = ucred_getatid(ucred);
1762 if (tid64 != NULL) {
1763 adt_cpy_tid(&termid, tid64);
1764 tid = &termid;
1765 } else {
1766 tid = NULL;
1767 }
1768 if (ucred_getauid(ucred) == AU_NOAUDITID) {
1769 adt_setto_unaudited(state);
1770 state->as_have_user_data = ADT_HAVE_ALL;
1771 rc = 0;
1772 goto return_rc;
1773 } else {
1774 state->as_info.ai_auid = ucred_getauid(ucred);
1775 state->as_info.ai_asid = ucred_getasid(ucred);
1776 state->as_info.ai_mask = *ucred_getamask(ucred);
1777 state->as_info.ai_termid = *tid;
1778 }
1779 state->as_have_user_data = ADT_HAVE_ALL;
1780 break;
1781 case ADT_UPDATE:
1782 if (state->as_have_user_data != ADT_HAVE_ALL) {
1783 errno = EINVAL;
1784 goto return_rc;
1785 }
1786
1787 if ((rc = adt_changeuser(state, ucred_getruid(ucred))) != 0)
1788 goto return_rc;
1789 break;
1790 case ADT_USER:
1791 if (state->as_have_user_data != ADT_HAVE_ALL) {
1792 errno = EINVAL;
1793 goto return_rc;
1794 }
1795 break;
1796 default:
1797 errno = EINVAL;
1798 goto return_rc;
1799 }
1800 rc = 0;
1801
1802 state->as_ruid = ucred_getruid(ucred);
1803 state->as_euid = ucred_geteuid(ucred);
1804 state->as_rgid = ucred_getrgid(ucred);
1805 state->as_egid = ucred_getegid(ucred);
1806 state->as_pid = ucred_getpid(ucred);
1807 state->as_label = adt_ucred_label(ucred);
1808
1809 return_rc:
1810 if (local_uc) {
1811 ucred_free(ucred);
1812 }
1813 return (rc);
1814 }
1815
1816 /*
1817 * adt_alloc_event() returns a pointer to allocated memory
1818 *
1819 */
1820
1821 adt_event_data_t
1822 *adt_alloc_event(const adt_session_data_t *session_data, au_event_t event_id)
1823 {
1824 struct adt_event_state *event_state;
1825 adt_internal_state_t *session_state;
1826 adt_event_data_t *return_event = NULL;
1827 /*
1828 * need to return a valid event pointer even if audit is
1829 * off, else the caller will end up either (1) keeping its
1830 * own flags for on/off or (2) writing to a NULL pointer.
1831 * If auditing is on, the session data must be valid; otherwise
1832 * we don't care.
1833 */
1834 if (session_data != NULL) {
1835 session_state = (adt_internal_state_t *)session_data;
1836 assert(session_state->as_check == ADT_VALID);
1837 }
1838 event_state = calloc(1, sizeof (struct adt_event_state));
1839 if (event_state == NULL)
1840 goto return_ptr;
1841
1842 event_state->ae_check = ADT_VALID;
1843
1844 event_state->ae_event_id = event_id;
1845 event_state->ae_session = (struct adt_internal_state *)session_data;
1846
1847 return_event = (adt_event_data_t *)&(event_state->ae_event_data);
1848
1849 /*
1850 * preload data so the adt_au_*() functions can detect un-supplied
1851 * values (0 and NULL are free via calloc()).
1852 */
1853 if (session_data != NULL) {
1854 session_state->as_preload(event_id, return_event);
1855 }
1856
1857 return_ptr:
1858 return (return_event);
1859 }
1860
1861 /*
1862 * adt_getXlateTable -- look up translation table address for event id
1863 */
1864
1865 static adt_translation_t *
1866 adt_getXlateTable(adt_translation_t **xlate, au_event_t event_id)
1867 {
1868 /* xlate_table is global in adt_xlate.c */
1869 adt_translation_t **p_xlate = xlate;
1870 adt_translation_t *p_event;
1871
1872 while (*p_xlate != NULL) {
1873 p_event = *p_xlate;
1874 if (event_id == p_event->tx_external_event)
1875 return (p_event);
1876 p_xlate++;
1877 }
1878 return (NULL);
1879 }
1880
1881 /*
1882 * adt_calcOffsets
1883 *
1884 * the call to this function is surrounded by a mutex.
1885 *
1886 * i walks down the table picking up next_token. j walks again to
1887 * calculate the offset to the input data. k points to the next
1888 * token's row. Finally, l, is used to sum the values in the
1889 * datadef array.
1890 *
1891 * What's going on? The entry array is in the order of the input
1892 * fields but the processing of array entries is in the order of
1893 * the output (see next_token). Calculating the offset to the
1894 * "next" input can't be done in the outer loop (i) since i doesn't
1895 * point to the current entry and it can't be done with the k index
1896 * because it doesn't represent the order of input fields.
1897 *
1898 * While the resulting algorithm is n**2, it is only done once per
1899 * event type.
1900 */
1901
1902 /*
1903 * adt_calcOffsets is only called once per event type, but it uses
1904 * the address alignment of memory allocated for that event as if it
1905 * were the same for all subsequently allocated memory. This is
1906 * guaranteed by calloc/malloc. Arrays take special handling since
1907 * what matters for figuring out the correct alignment is the size
1908 * of the array element.
1909 */
1910
1911 static void
1912 adt_calcOffsets(struct entry *p_entry, int tablesize, void *p_data)
1913 {
1914 int i, j;
1915 size_t this_size, prev_size;
1916 void *struct_start = p_data;
1917
1918 for (i = 0; i < tablesize; i++) {
1919 if (p_entry[i].en_type_def == NULL) {
1920 p_entry[i].en_offset = 0;
1921 continue;
1922 }
1923 prev_size = 0;
1924 p_entry[i].en_offset = (char *)p_data - (char *)struct_start;
1925
1926 for (j = 0; j < p_entry[i].en_count_types; j++) {
1927 if (p_entry[i].en_type_def[j].dd_datatype == ADT_MSG)
1928 this_size = sizeof (enum adt_generic);
1929 else
1930 this_size =
1931 p_entry[i].en_type_def[j].dd_input_size;
1932
1933 /* adj for first entry */
1934 if (prev_size == 0)
1935 prev_size = this_size;
1936
1937 if (p_entry[i].en_type_def[j].dd_datatype ==
1938 ADT_UINT32ARRAY) {
1939 p_data = (char *)adt_adjust_address(p_data,
1940 prev_size, sizeof (uint32_t)) +
1941 this_size - sizeof (uint32_t);
1942
1943 prev_size = sizeof (uint32_t);
1944 } else {
1945 p_data = adt_adjust_address(p_data, prev_size,
1946 this_size);
1947 prev_size = this_size;
1948 }
1949 }
1950 }
1951 }
1952
1953 /*
1954 * adt_generate_event
1955 * generate event record from external struct. The order is based on
1956 * the output tokens, allowing for the possibility that the input data
1957 * is in a different order.
1958 *
1959 */
1960
1961 static int
1962 adt_generate_event(const adt_event_data_t *p_extdata,
1963 struct adt_event_state *p_event,
1964 adt_translation_t *p_xlate)
1965 {
1966 struct entry *p_entry;
1967 static mutex_t lock = DEFAULTMUTEX;
1968
1969 p_entry = p_xlate->tx_first_entry;
1970 assert(p_entry != NULL);
1971
1972 p_event->ae_internal_id = p_xlate->tx_internal_event;
1973 adt_token_open(p_event);
1974
1975 /*
1976 * offsets are not pre-calculated; the initial offsets are all
1977 * 0; valid offsets are >= 0. Offsets for no-input tokens such
1978 * as subject are set to -1 by adt_calcOffset()
1979 */
1980 if (p_xlate->tx_offsetsCalculated == 0) {
1981 (void) mutex_lock(&lock);
1982 p_xlate->tx_offsetsCalculated = 1;
1983
1984 adt_calcOffsets(p_xlate->tx_top_entry, p_xlate->tx_entries,
1985 (void *)p_extdata);
1986 (void) mutex_unlock(&lock);
1987 }
1988 while (p_entry != NULL) {
1989 adt_generate_token(p_entry, (char *)p_extdata, p_event);
1990
1991 p_entry = p_entry->en_next_token;
1992 }
1993 return (adt_token_close(p_event));
1994 }
1995
1996 /*
1997 * adt_put_event -- main event generation function.
1998 * The input "event" is the address of the struct containing
1999 * event-specific data.
2000 *
2001 * However if auditing is off or the session handle
2002 * is NULL, no attempt to write a record is made.
2003 */
2004
2005 int
2006 adt_put_event(const adt_event_data_t *event, int status, int return_val)
2007 {
2008 struct adt_event_state *event_state;
2009 adt_translation_t *xlate;
2010
2011 if (event == NULL) {
2012 errno = EINVAL;
2013 return (-1);
2014 }
2015 event_state = (struct adt_event_state *)event;
2016
2017 /* if this is a broken session or not auditing, exit */
2018 if ((event_state->ae_session == NULL) ||
2019 !(event_state->ae_session->as_audit_state &
2020 (AUC_AUDITING | AUC_NOSPACE))) {
2021 return (0);
2022 }
2023
2024 assert(event_state->ae_check == ADT_VALID);
2025
2026 event_state->ae_rc = status;
2027 event_state->ae_type = return_val;
2028
2029 /* look up the event */
2030
2031 xlate = adt_getXlateTable(event_state->ae_session->as_xlate,
2032 event_state->ae_event_id);
2033
2034 if (xlate == NULL) {
2035 errno = EINVAL;
2036 return (-1);
2037 }
2038 DPRINTF(("got event %d\n", xlate->tx_internal_event));
2039
2040 if (adt_selected(event_state, xlate->tx_internal_event, status)) {
2041 return (adt_generate_event(event, event_state, xlate));
2042 }
2043
2044 return (0);
2045 }
2046
2047 /*
2048 * adt_free_event -- invalidate and free
2049 */
2050
2051 void
2052 adt_free_event(adt_event_data_t *event)
2053 {
2054 struct adt_event_state *event_state;
2055
2056 if (event == NULL)
2057 return;
2058
2059 event_state = (struct adt_event_state *)event;
2060
2061 assert(event_state->ae_check == ADT_VALID);
2062
2063 event_state->ae_check = 0;
2064
2065 free(event_state);
2066 }
2067
2068 /*
2069 * adt_is_selected -- helper to adt_selected(), below.
2070 *
2071 * "sorf" is "success or fail" status; au_preselect compares
2072 * that with success, fail, or both.
2073 */
2074
2075 static int
2076 adt_is_selected(au_event_t e, au_mask_t *m, int sorf)
2077 {
2078 int prs_sorf;
2079
2080 if (sorf == 0)
2081 prs_sorf = AU_PRS_SUCCESS;
2082 else
2083 prs_sorf = AU_PRS_FAILURE;
2084
2085 return (au_preselect(e, m, prs_sorf, AU_PRS_REREAD));
2086 }
2087
2088 /*
2089 * selected -- see if this event is preselected.
2090 *
2091 * if errors are encountered trying to check a preselection mask
2092 * or look up a user name, the event is selected. Otherwise, the
2093 * preselection mask is used for the job.
2094 */
2095
2096 static int
2097 adt_selected(struct adt_event_state *event, au_event_t actual_id, int status)
2098 {
2099 adt_internal_state_t *sp;
2100 au_mask_t namask;
2101
2102 sp = event->ae_session;
2103
2104 if ((sp->as_have_user_data & ADT_HAVE_IDS) == 0) {
2105 adt_write_syslog("No user data available", EINVAL);
2106 return (1); /* default is "selected" */
2107 }
2108
2109 /* non-attributable? */
2110 if ((sp->as_info.ai_auid == AU_NOAUDITID) ||
2111 (sp->as_info.ai_auid == ADT_NO_AUDIT)) {
2112 if (auditon(A_GETKMASK, (caddr_t)&namask,
2113 sizeof (namask)) != 0) {
2114 adt_write_syslog("auditon failure", errno);
2115 return (1);
2116 }
2117 return (adt_is_selected(actual_id, &namask, status));
2118 } else {
2119 return (adt_is_selected(actual_id, &(sp->as_info.ai_mask),
2120 status));
2121 }
2122 }
2123
2124 /*
2125 * Can't map the host name to an IP address in
2126 * adt_get_hostIP. Get something off an interface
2127 * to act as the hosts IP address for auditing.
2128 */
2129
2130 static int
2131 adt_get_local_address(int family, struct ifaddrlist *al)
2132 {
2133 struct ifaddrlist *ifal;
2134 char errbuf[ERRBUFSIZE] = "empty list";
2135 char msg[ERRBUFSIZE + 512];
2136 int ifal_count;
2137 int i;
2138
2139 if ((ifal_count = ifaddrlist(&ifal, family, 0, errbuf)) < 0) {
2140 int serrno = errno;
2141
2142 (void) snprintf(msg, sizeof (msg), "adt_get_local_address "
2143 "couldn't get %d addrlist %s", family, errbuf);
2144 adt_write_syslog(msg, serrno);
2145 errno = serrno;
2146 return (-1);
2147 }
2148
2149 for (i = 0; i < ifal_count; i++) {
2150 /*
2151 * loopback always defined,
2152 * even if there is no real address
2153 */
2154 if ((ifal[i].flags & (IFF_UP | IFF_LOOPBACK)) == IFF_UP) {
2155 break;
2156 }
2157 }
2158 if (i >= ifal_count) {
2159 free(ifal);
2160 /*
2161 * Callers of adt_get_hostIP() can only return
2162 * errno to their callers and eventually the application.
2163 * Picked one that seemed least worse for saying no
2164 * usable address for Audit terminal ID.
2165 */
2166 errno = ENETDOWN;
2167 return (-1);
2168 }
2169
2170 *al = ifal[i];
2171 free(ifal);
2172 return (0);
2173 }