1 /*- 2 * Copyright (c) 2004-2009 Apple Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of Apple Inc. ("Apple") nor the names of 15 * its contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/types.h> 31 32 #include <config/config.h> 33 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/mman.h> 41 #include <sys/param.h> 42 #include <sys/stat.h> 43 #include <sys/wait.h> 44 45 #include <bsm/audit.h> 46 #include <bsm/audit_uevents.h> 47 #include <bsm/auditd_lib.h> 48 #include <bsm/libbsm.h> 49 50 #include <err.h> 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <grp.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <time.h> 57 #include <unistd.h> 58 #include <signal.h> 59 #include <string.h> 60 61 #include "auditd.h" 62 63 #ifndef HAVE_STRLCPY 64 #include <compat/strlcpy.h> 65 #endif 66 67 /* 68 * XXX The following are temporary until these can be added to the kernel 69 * audit.h header. 70 */ 71 #ifndef AUDIT_TRIGGER_INITIALIZE 72 #define AUDIT_TRIGGER_INITIALIZE 7 73 #endif 74 #ifndef AUDIT_TRIGGER_EXPIRE_TRAILS 75 #define AUDIT_TRIGGER_EXPIRE_TRAILS 8 76 #endif 77 78 79 /* 80 * LaunchD flag (Mac OS X and, maybe, FreeBSD only.) See launchd(8) and 81 * http://wiki.freebsd.org/launchd for more information. 82 * 83 * In order for auditd to work "on demand" with launchd(8) it can't: 84 * call daemon(3) 85 * call fork and having the parent process exit 86 * change uids or gids. 87 * set up the current working directory or chroot. 88 * set the session id 89 * change stdio to /dev/null. 90 * call setrusage(2) 91 * call setpriority(2) 92 * Ignore SIGTERM. 93 * auditd (in 'launchd mode') is launched on demand so it must catch 94 * SIGTERM to exit cleanly. 95 */ 96 static int launchd_flag = 0; 97 98 /* 99 * The GID of the audit review group (if used). The audit trail files and 100 * system logs (Mac OS X only) can only be reviewed by members of this group 101 * or the audit administrator (aka. "root"). 102 */ 103 static gid_t audit_review_gid = -1; 104 105 /* 106 * The path and file name of the last audit trail file. 107 */ 108 static char *lastfile = NULL; 109 110 /* 111 * Error starting auditd. Run warn script and exit. 112 */ 113 static void 114 fail_exit(void) 115 { 116 117 audit_warn_nostart(); 118 exit(1); 119 } 120 121 /* 122 * Follow the 'current' symlink to get the active trail file name. 123 */ 124 static char * 125 get_curfile(void) 126 { 127 char *cf; 128 int len; 129 130 cf = malloc(MAXPATHLEN); 131 if (cf == NULL) { 132 auditd_log_err("malloc failed: %m"); 133 return (NULL); 134 } 135 136 len = readlink(AUDIT_CURRENT_LINK, cf, MAXPATHLEN - 1); 137 if (len < 0) { 138 free(cf); 139 return (NULL); 140 } 141 142 /* readlink() doesn't terminate string. */ 143 cf[len] = '\0'; 144 145 return (cf); 146 } 147 148 /* 149 * Close the previous audit trail file. 150 */ 151 static int 152 close_lastfile(char *TS) 153 { 154 char *ptr; 155 char *oldname; 156 157 /* If lastfile is NULL try to get it from the 'current' link. */ 158 if (lastfile == NULL) 159 lastfile = get_curfile(); 160 161 if (lastfile != NULL) { 162 oldname = strdup(lastfile); 163 if (oldname == NULL) 164 return (-1); 165 166 /* Rename the last file -- append timestamp. */ 167 if ((ptr = strstr(lastfile, NOT_TERMINATED)) != NULL) { 168 memcpy(ptr, TS, POSTFIX_LEN); 169 if (auditd_rename(oldname, lastfile) != 0) 170 auditd_log_err( 171 "Could not rename %s to %s: %m", oldname, 172 lastfile); 173 else { 174 /* 175 * Remove the 'current' symlink since the link 176 * is now invalid. 177 */ 178 (void) unlink(AUDIT_CURRENT_LINK); 179 auditd_log_notice("renamed %s to %s", 180 oldname, lastfile); 181 audit_warn_closefile(lastfile); 182 } 183 } else 184 auditd_log_err("Could not rename %s to %s", oldname, 185 lastfile); 186 free(lastfile); 187 free(oldname); 188 lastfile = NULL; 189 } 190 return (0); 191 } 192 193 /* 194 * Create the new file name, swap with existing audit file. 195 */ 196 static int 197 swap_audit_file(void) 198 { 199 int err; 200 char *newfile, *name; 201 char TS[TIMESTAMP_LEN + 1]; 202 time_t tt; 203 204 if (getTSstr(tt, TS, sizeof(TS)) != 0) 205 return (-1); 206 /* 207 * If prefix and suffix are the same, it means that records are 208 * being produced too fast. We don't want to rename now, because 209 * next trail file can get the same name and once that one is 210 * terminated also within one second it will overwrite the current 211 * one. Just keep writing to the same trail and wait for the next 212 * trigger from the kernel. 213 * FREEBSD KERNEL WAS UPDATED TO KEEP SENDING TRIGGERS, WHICH MIGHT 214 * NOT BE THE CASE FOR OTHER OSES. 215 * If the kernel will not keep sending triggers, trail file will not 216 * be terminated. 217 */ 218 if (lastfile == NULL) { 219 name = NULL; 220 } else { 221 name = strrchr(lastfile, '/'); 222 if (name != NULL) 223 name++; 224 } 225 if (name != NULL && strncmp(name, TS, TIMESTAMP_LEN) == 0) { 226 auditd_log_debug("Not ready to terminate trail file yet."); 227 return (0); 228 } 229 err = auditd_swap_trail(TS, &newfile, audit_review_gid, 230 audit_warn_getacdir); 231 if (err != ADE_NOERR) { 232 auditd_log_err("%s: %m", auditd_strerror(err)); 233 if (err != ADE_ACTL) 234 return (-1); 235 } 236 237 /* 238 * Only close the last file if were in an auditing state before 239 * calling swap_audit_file(). We may need to recover from a crash. 240 */ 241 if (auditd_get_state() == AUD_STATE_ENABLED) 242 close_lastfile(TS); 243 244 245 /* 246 * auditd_swap_trail() potentially enables auditing (if not already 247 * enabled) so updated the cached state as well. 248 */ 249 auditd_set_state(AUD_STATE_ENABLED); 250 251 /* 252 * Create 'current' symlink. Recover from crash, if needed. 253 */ 254 if (auditd_new_curlink(newfile) != 0) 255 auditd_log_err("auditd_new_curlink(\"%s\") failed: %s: %m", 256 newfile, auditd_strerror(err)); 257 258 lastfile = newfile; 259 auditd_log_notice("New audit file is %s", newfile); 260 261 return (0); 262 } 263 264 /* 265 * Create a new audit log trail file and swap with the current one, if any. 266 */ 267 static int 268 do_trail_file(void) 269 { 270 int err; 271 272 /* 273 * First, refresh the list of audit log directories. 274 */ 275 err = auditd_read_dirs(audit_warn_soft, audit_warn_hard); 276 if (err) { 277 auditd_log_err("auditd_read_dirs(): %s", 278 auditd_strerror(err)); 279 if (err == ADE_HARDLIM) 280 audit_warn_allhard(); 281 if (err != ADE_SOFTLIM) 282 return (-1); 283 else 284 audit_warn_allsoft(); 285 /* continue on with soft limit error */ 286 } 287 288 /* 289 * Create a new file and swap with the one being used in kernel. 290 */ 291 if (swap_audit_file() == -1) { 292 /* 293 * XXX Faulty directory listing? - user should be given 294 * XXX an opportunity to change the audit_control file 295 * XXX switch to a reduced mode of auditing? 296 */ 297 return (-1); 298 } 299 300 /* 301 * Finally, see if there are any trail files to expire. 302 */ 303 err = auditd_expire_trails(audit_warn_expired); 304 if (err) 305 auditd_log_err("auditd_expire_trails(): %s", 306 auditd_strerror(err)); 307 308 return (0); 309 } 310 311 /* 312 * Start up auditing. 313 */ 314 static void 315 audit_setup(void) 316 { 317 int err; 318 319 /* Configure trail files distribution. */ 320 err = auditd_set_dist(); 321 if (err) { 322 auditd_log_err("auditd_set_dist() %s: %m", 323 auditd_strerror(err)); 324 } else 325 auditd_log_debug("Configured trail files distribution."); 326 327 if (do_trail_file() == -1) { 328 auditd_log_err("Error creating audit trail file"); 329 fail_exit(); 330 } 331 332 /* Generate an audit record. */ 333 err = auditd_gen_record(AUE_audit_startup, NULL); 334 if (err) 335 auditd_log_err("auditd_gen_record(AUE_audit_startup) %s: %m", 336 auditd_strerror(err)); 337 338 if (auditd_config_controls() == 0) 339 auditd_log_info("Audit controls init successful"); 340 else 341 auditd_log_err("Audit controls init failed"); 342 } 343 344 345 /* 346 * Close auditd pid file and trigger mechanism. 347 */ 348 static int 349 close_misc(void) 350 { 351 352 auditd_close_dirs(); 353 if (unlink(AUDITD_PIDFILE) == -1 && errno != ENOENT) { 354 auditd_log_err("Couldn't remove %s: %m", AUDITD_PIDFILE); 355 return (1); 356 } 357 endac(); 358 359 if (auditd_close_trigger() != 0) { 360 auditd_log_err("Error closing trigger messaging mechanism"); 361 return (1); 362 } 363 return (0); 364 } 365 366 /* 367 * Close all log files, control files, and tell the audit system. 368 */ 369 static int 370 close_all(void) 371 { 372 int err_ret = 0; 373 char TS[TIMESTAMP_LEN + 1]; 374 int err; 375 int cond; 376 time_t tt; 377 378 err = auditd_gen_record(AUE_audit_shutdown, NULL); 379 if (err) 380 auditd_log_err("auditd_gen_record(AUE_audit_shutdown) %s: %m", 381 auditd_strerror(err)); 382 383 /* Flush contents. */ 384 cond = AUC_DISABLED; 385 err_ret = audit_set_cond(&cond); 386 if (err_ret != 0) { 387 auditd_log_err("Disabling audit failed! : %s", strerror(errno)); 388 err_ret = 1; 389 } 390 391 /* 392 * Updated the cached state that auditing has been disabled. 393 */ 394 auditd_set_state(AUD_STATE_DISABLED); 395 396 if (getTSstr(tt, TS, sizeof(TS)) == 0) 397 close_lastfile(TS); 398 if (lastfile != NULL) 399 free(lastfile); 400 401 err_ret += close_misc(); 402 403 if (err_ret) { 404 auditd_log_err("Could not unregister"); 405 audit_warn_postsigterm(); 406 } 407 408 auditd_log_info("Finished"); 409 return (err_ret); 410 } 411 412 /* 413 * Register the daemon with the signal handler and the auditd pid file. 414 */ 415 static int 416 register_daemon(void) 417 { 418 FILE * pidfile; 419 int fd; 420 pid_t pid; 421 422 /* Set up the signal hander. */ 423 if (signal(SIGTERM, auditd_relay_signal) == SIG_ERR) { 424 auditd_log_err( 425 "Could not set signal handler for SIGTERM"); 426 fail_exit(); 427 } 428 if (signal(SIGCHLD, auditd_relay_signal) == SIG_ERR) { 429 auditd_log_err( 430 "Could not set signal handler for SIGCHLD"); 431 fail_exit(); 432 } 433 if (signal(SIGHUP, auditd_relay_signal) == SIG_ERR) { 434 auditd_log_err( 435 "Could not set signal handler for SIGHUP"); 436 fail_exit(); 437 } 438 if (signal(SIGALRM, auditd_relay_signal) == SIG_ERR) { 439 auditd_log_err( 440 "Could not set signal handler for SIGALRM"); 441 fail_exit(); 442 } 443 444 if ((pidfile = fopen(AUDITD_PIDFILE, "a")) == NULL) { 445 auditd_log_err("Could not open PID file"); 446 audit_warn_tmpfile(); 447 return (-1); 448 } 449 450 /* Attempt to lock the pid file; if a lock is present, exit. */ 451 fd = fileno(pidfile); 452 if (flock(fd, LOCK_EX | LOCK_NB) < 0) { 453 auditd_log_err( 454 "PID file is locked (is another auditd running?)."); 455 audit_warn_ebusy(); 456 return (-1); 457 } 458 459 pid = getpid(); 460 ftruncate(fd, 0); 461 if (fprintf(pidfile, "%u\n", pid) < 0) { 462 /* Should not start the daemon. */ 463 fail_exit(); 464 } 465 466 fflush(pidfile); 467 return (0); 468 } 469 470 /* 471 * Handle the audit trigger event. 472 * 473 * We suppress (ignore) duplicated triggers in close succession in order to 474 * try to avoid thrashing-like behavior. However, not all triggers can be 475 * ignored, as triggers generally represent edge triggers, not level 476 * triggers, and won't be retransmitted if the condition persists. Of 477 * specific concern is the rotate trigger -- if one is dropped, then it will 478 * not be retransmitted, and the log file will grow in an unbounded fashion. 479 */ 480 #define DUPLICATE_INTERVAL 30 481 void 482 auditd_handle_trigger(int trigger) 483 { 484 static int last_trigger, last_warning; 485 static time_t last_time; 486 struct timeval ts; 487 struct timezone tzp; 488 time_t tt; 489 int au_state; 490 int err = 0; 491 492 /* 493 * Suppress duplicate messages from the kernel within the specified 494 * interval. 495 */ 496 if (gettimeofday(&ts, &tzp) == 0) { 497 tt = (time_t)ts.tv_sec; 498 switch (trigger) { 499 case AUDIT_TRIGGER_LOW_SPACE: 500 case AUDIT_TRIGGER_NO_SPACE: 501 /* 502 * Triggers we can suppress. Of course, we also need 503 * to rate limit the warnings, so apply the same 504 * interval limit on syslog messages. 505 */ 506 if ((trigger == last_trigger) && 507 (tt < (last_time + DUPLICATE_INTERVAL))) { 508 if (tt >= (last_warning + DUPLICATE_INTERVAL)) 509 auditd_log_info( 510 "Suppressing duplicate trigger %d", 511 trigger); 512 return; 513 } 514 last_warning = tt; 515 break; 516 517 case AUDIT_TRIGGER_ROTATE_KERNEL: 518 case AUDIT_TRIGGER_ROTATE_USER: 519 case AUDIT_TRIGGER_READ_FILE: 520 case AUDIT_TRIGGER_CLOSE_AND_DIE: 521 case AUDIT_TRIGGER_INITIALIZE: 522 /* 523 * Triggers that we cannot suppress. 524 */ 525 break; 526 } 527 528 /* 529 * Only update last_trigger after aborting due to a duplicate 530 * trigger, not before, or we will never allow that trigger 531 * again. 532 */ 533 last_trigger = trigger; 534 last_time = tt; 535 } 536 537 au_state = auditd_get_state(); 538 539 /* 540 * Message processing is done here. 541 */ 542 switch(trigger) { 543 case AUDIT_TRIGGER_LOW_SPACE: 544 auditd_log_notice("Got low space trigger"); 545 if (do_trail_file() == -1) 546 auditd_log_err("Error swapping audit file"); 547 break; 548 549 case AUDIT_TRIGGER_NO_SPACE: 550 auditd_log_notice("Got no space trigger"); 551 if (do_trail_file() == -1) 552 auditd_log_err("Error swapping audit file"); 553 break; 554 555 case AUDIT_TRIGGER_ROTATE_KERNEL: 556 case AUDIT_TRIGGER_ROTATE_USER: 557 auditd_log_info("Got open new trigger from %s", trigger == 558 AUDIT_TRIGGER_ROTATE_KERNEL ? "kernel" : "user"); 559 if (au_state == AUD_STATE_ENABLED && do_trail_file() == -1) 560 auditd_log_err("Error swapping audit file"); 561 break; 562 563 case AUDIT_TRIGGER_READ_FILE: 564 auditd_log_info("Got read file trigger"); 565 if (au_state == AUD_STATE_ENABLED) { 566 if (auditd_config_controls() == -1) 567 auditd_log_err("Error setting audit controls"); 568 else if (do_trail_file() == -1) 569 auditd_log_err("Error swapping audit file"); 570 } 571 break; 572 573 case AUDIT_TRIGGER_CLOSE_AND_DIE: 574 auditd_log_info("Got close and die trigger"); 575 if (au_state == AUD_STATE_ENABLED) 576 err = close_all(); 577 /* 578 * Running under launchd don't exit. Wait for launchd to 579 * send SIGTERM. 580 */ 581 if (!launchd_flag) { 582 auditd_log_info("auditd exiting."); 583 exit (err); 584 } 585 break; 586 587 case AUDIT_TRIGGER_INITIALIZE: 588 auditd_log_info("Got audit initialize trigger"); 589 if (au_state == AUD_STATE_DISABLED) 590 audit_setup(); 591 break; 592 593 case AUDIT_TRIGGER_EXPIRE_TRAILS: 594 auditd_log_info("Got audit expire trails trigger"); 595 err = auditd_expire_trails(audit_warn_expired); 596 if (err) 597 auditd_log_err("auditd_expire_trails(): %s", 598 auditd_strerror(err)); 599 break; 600 601 default: 602 auditd_log_err("Got unknown trigger %d", trigger); 603 break; 604 } 605 } 606 607 /* 608 * Reap our children. 609 */ 610 void 611 auditd_reap_children(void) 612 { 613 pid_t child; 614 int wstatus; 615 616 while ((child = waitpid(-1, &wstatus, WNOHANG)) > 0) { 617 if (!wstatus) 618 continue; 619 auditd_log_info("warn process [pid=%d] %s %d.", child, 620 ((WIFEXITED(wstatus)) ? "exited with non-zero status" : 621 "exited as a result of signal"), 622 ((WIFEXITED(wstatus)) ? WEXITSTATUS(wstatus) : 623 WTERMSIG(wstatus))); 624 } 625 } 626 627 /* 628 * Reap any children and terminate. If under launchd don't shutdown auditing 629 * but just the other stuff. 630 */ 631 void 632 auditd_terminate(void) 633 { 634 int ret; 635 636 auditd_reap_children(); 637 638 if (launchd_flag) 639 ret = close_misc(); 640 else 641 ret = close_all(); 642 643 exit(ret); 644 } 645 646 /* 647 * Configure the audit controls in the kernel: the event to class mapping, 648 * kernel preselection mask, etc. 649 */ 650 int 651 auditd_config_controls(void) 652 { 653 int cnt, err; 654 int ret = 0; 655 656 /* 657 * Configure event to class mappings in kernel. 658 */ 659 cnt = auditd_set_evcmap(); 660 if (cnt < 0) { 661 auditd_log_err("auditd_set_evcmap() failed: %m"); 662 ret = -1; 663 } else if (cnt == 0) { 664 auditd_log_err("No events to class mappings registered."); 665 ret = -1; 666 } else 667 auditd_log_debug("Registered %d event to class mappings.", cnt); 668 669 /* 670 * Configure non-attributable event mask in kernel. 671 */ 672 err = auditd_set_namask(); 673 if (err) { 674 auditd_log_err("auditd_set_namask() %s: %m", 675 auditd_strerror(err)); 676 ret = -1; 677 } else 678 auditd_log_debug("Registered non-attributable event mask."); 679 680 /* 681 * Configure audit policy in kernel. 682 */ 683 err = auditd_set_policy(); 684 if (err) { 685 auditd_log_err("auditd_set_policy() %s: %m", 686 auditd_strerror(err)); 687 ret = -1; 688 } else 689 auditd_log_debug("Set audit policy in kernel."); 690 691 /* 692 * Configure audit trail log size in kernel. 693 */ 694 err = auditd_set_fsize(); 695 if (err) { 696 auditd_log_err("audit_set_fsize() %s: %m", 697 auditd_strerror(err)); 698 ret = -1; 699 } else 700 auditd_log_debug("Set audit trail size in kernel."); 701 702 /* 703 * Configure audit trail queue size in kernel. 704 */ 705 err = auditd_set_qsize(); 706 if (err) { 707 auditd_log_err("audit_set_qsize() %s: %m", 708 auditd_strerror(err)); 709 ret = -1; 710 } else 711 auditd_log_debug("Set audit trail queue in kernel."); 712 713 /* 714 * Configure audit trail volume minimum free percentage of blocks in 715 * kernel. 716 */ 717 err = auditd_set_minfree(); 718 if (err) { 719 auditd_log_err("auditd_set_minfree() %s: %m", 720 auditd_strerror(err)); 721 ret = -1; 722 } else 723 auditd_log_debug( 724 "Set audit trail min free percent in kernel."); 725 726 /* 727 * Configure host address in the audit kernel information. 728 */ 729 err = auditd_set_host(); 730 if (err) { 731 if (err == ADE_PARSE) { 732 auditd_log_notice( 733 "audit_control(5) may be missing 'host:' field"); 734 } else { 735 auditd_log_err("auditd_set_host() %s: %m", 736 auditd_strerror(err)); 737 ret = -1; 738 } 739 } else 740 auditd_log_debug( 741 "Set audit host address information in kernel."); 742 743 return (ret); 744 } 745 746 /* 747 * Setup and initialize auditd. 748 */ 749 static void 750 setup(void) 751 { 752 int err; 753 754 if (auditd_open_trigger(launchd_flag) < 0) { 755 auditd_log_err("Error opening trigger messaging mechanism"); 756 fail_exit(); 757 } 758 759 /* 760 * To prevent event feedback cycles and avoid auditd becoming 761 * stalled if auditing is suspended, auditd and its children run 762 * without their events being audited. We allow the uid, tid, and 763 * mask fields to be implicitly set to zero, but do set the pid. We 764 * run this after opening the trigger device to avoid configuring 765 * audit state without audit present in the system. 766 */ 767 err = auditd_prevent_audit(); 768 if (err) { 769 auditd_log_err("auditd_prevent_audit() %s: %m", 770 auditd_strerror(err)); 771 fail_exit(); 772 } 773 774 /* 775 * Make sure auditd auditing state is correct. 776 */ 777 auditd_set_state(AUD_STATE_INIT); 778 779 /* 780 * If under launchd, don't start auditing. Wait for a trigger to 781 * do so. 782 */ 783 if (!launchd_flag) 784 audit_setup(); 785 } 786 787 int 788 main(int argc, char **argv) 789 { 790 int ch; 791 int debug = 0; 792 #ifdef AUDIT_REVIEW_GROUP 793 struct group *grp; 794 #endif 795 796 while ((ch = getopt(argc, argv, "dl")) != -1) { 797 switch(ch) { 798 case 'd': 799 /* Debug option. */ 800 debug = 1; 801 break; 802 803 case 'l': 804 /* Be launchd friendly. */ 805 launchd_flag = 1; 806 break; 807 808 case '?': 809 default: 810 (void)fprintf(stderr, 811 "usage: auditd [-d] [-l]\n"); 812 exit(1); 813 } 814 } 815 816 audit_review_gid = getgid(); 817 818 #ifdef AUDIT_REVIEW_GROUP 819 /* 820 * XXXRW: Currently, this code falls back to the daemon gid, which is 821 * likely the wheel group. Is there a better way to deal with this? 822 */ 823 grp = getgrnam(AUDIT_REVIEW_GROUP); 824 if (grp != NULL) 825 audit_review_gid = grp->gr_gid; 826 #endif 827 828 auditd_openlog(debug, audit_review_gid); 829 830 if (launchd_flag) 831 auditd_log_info("started by launchd..."); 832 else 833 auditd_log_info("starting..."); 834 835 #ifdef AUDIT_REVIEW_GROUP 836 if (grp == NULL) 837 auditd_log_info( 838 "Audit review group '%s' not available, using daemon gid (%d)", 839 AUDIT_REVIEW_GROUP, audit_review_gid); 840 #endif 841 if (debug == 0 && launchd_flag == 0 && daemon(0, 0) == -1) { 842 auditd_log_err("Failed to daemonize"); 843 exit(1); 844 } 845 846 if (register_daemon() == -1) { 847 auditd_log_err("Could not register as daemon"); 848 exit(1); 849 } 850 851 setup(); 852 853 /* 854 * auditd_wait_for_events() shouldn't return unless something is wrong. 855 */ 856 auditd_wait_for_events(); 857 858 auditd_log_err("abnormal exit."); 859 close_all(); 860 exit(-1); 861 } 862