1 /* $NetBSD: ntpd.c,v 1.19 2024/08/18 20:47:18 christos Exp $ */ 2 3 /* 4 * ntpd.c - main program for the fixed point NTP daemon 5 */ 6 7 #ifdef HAVE_CONFIG_H 8 # include <config.h> 9 #endif 10 11 #include "ntp_machine.h" 12 #include "ntpd.h" 13 #include "ntp_io.h" 14 #include "ntp_stdlib.h" 15 #include <ntp_random.h> 16 17 #include "ntp_config.h" 18 #include "ntp_syslog.h" 19 #include "ntp_assert.h" 20 #include "isc/error.h" 21 #include "isc/strerror.h" 22 #include "isc/formatcheck.h" 23 #include "iosignal.h" 24 25 #ifdef SIM 26 # include "ntpsim.h" 27 #endif 28 29 #include "ntp_libopts.h" 30 #include "ntpd-opts.h" 31 32 /* there's a short treatise below what the thread stuff is for. 33 * [Bug 2954] enable the threading warm-up only for Linux. 34 */ 35 #if defined(HAVE_PTHREADS) && HAVE_PTHREADS && !defined(NO_THREADS) 36 # ifdef HAVE_PTHREAD_H 37 # include <pthread.h> 38 # endif 39 # if defined(linux) 40 # define NEED_PTHREAD_WARMUP 41 # endif 42 #endif 43 44 #ifdef HAVE_UNISTD_H 45 # include <unistd.h> 46 #endif 47 #ifdef HAVE_SYS_STAT_H 48 # include <sys/stat.h> 49 #endif 50 #ifdef HAVE_SYS_WAIT_H 51 # include <sys/wait.h> 52 #endif 53 #include <stdio.h> 54 #ifdef HAVE_SYS_PARAM_H 55 # include <sys/param.h> 56 #endif 57 #ifdef HAVE_SYS_SIGNAL_H 58 # include <sys/signal.h> 59 #else 60 # include <signal.h> 61 #endif 62 #ifdef HAVE_SYS_IOCTL_H 63 # include <sys/ioctl.h> 64 #endif /* HAVE_SYS_IOCTL_H */ 65 #if defined(HAVE_RTPRIO) 66 # ifdef HAVE_SYS_LOCK_H 67 # include <sys/lock.h> 68 # endif 69 # include <sys/rtprio.h> 70 #else 71 # ifdef HAVE_PLOCK 72 # ifdef HAVE_SYS_LOCK_H 73 # include <sys/lock.h> 74 # endif 75 # endif 76 #endif 77 #if defined(HAVE_SCHED_SETSCHEDULER) 78 # ifdef HAVE_SCHED_H 79 # include <sched.h> 80 # else 81 # ifdef HAVE_SYS_SCHED_H 82 # include <sys/sched.h> 83 # endif 84 # endif 85 #endif 86 #if defined(HAVE_SYS_MMAN_H) 87 # include <sys/mman.h> 88 #endif 89 90 #ifdef HAVE_SYSEXITS_H 91 # include <sysexits.h> 92 #endif 93 94 #ifdef HAVE_TERMIOS_H 95 # include <termios.h> 96 #endif 97 98 #ifdef SYS_DOMAINOS 99 # include <apollo/base.h> 100 #endif /* SYS_DOMAINOS */ 101 102 103 #include "recvbuff.h" 104 #include "ntp_cmdargs.h" 105 106 #ifdef SYS_WINNT 107 # include "ntservice.h" 108 #endif 109 110 #ifdef _AIX 111 # include <ulimit.h> 112 #endif /* _AIX */ 113 114 #ifdef SCO5_CLOCK 115 # include <sys/ci/ciioctl.h> 116 #endif 117 118 #ifdef HAVE_DROPROOT 119 # include <ctype.h> 120 # include <grp.h> 121 # include <pwd.h> 122 #ifdef HAVE_LINUX_CAPABILITIES 123 # include <sys/capability.h> 124 # include <sys/prctl.h> 125 #endif /* HAVE_LINUX_CAPABILITIES */ 126 #if defined(HAVE_PRIV_H) && defined(HAVE_SOLARIS_PRIVS) 127 # include <priv.h> 128 #endif /* HAVE_PRIV_H */ 129 #if defined(HAVE_TRUSTEDBSD_MAC) 130 # include <sys/mac.h> 131 #endif /* HAVE_TRUSTEDBSD_MAC */ 132 #endif /* HAVE_DROPROOT */ 133 134 #if defined (LIBSECCOMP) && (KERN_SECCOMP) 135 /* # include <sys/types.h> */ 136 # include <sys/resource.h> 137 # include <seccomp.h> 138 #endif /* LIBSECCOMP and KERN_SECCOMP */ 139 140 #if defined(__FreeBSD__) && __FreeBSD_version < 1400037 && defined(HAVE_SYS_PROCCTL_H) 141 # include <sys/procctl.h> 142 # ifdef PROC_STACKGAP_DISABLE 143 # define DISABLE_FREEBSD_STACKGAP 144 # endif 145 #endif 146 147 #ifdef HAVE_DNSREGISTRATION 148 # include <dns_sd.h> 149 DNSServiceRef mdns; 150 #endif 151 152 /* In case 'sysexits.h' is unavailable, define some exit codes here: */ 153 #ifndef EX_SOFTWARE 154 # define EX_SOFTWARE 70 155 #endif 156 #ifndef EX_OSERR 157 # define EX_OSERR 71 158 #endif 159 #ifndef EX_IOERR 160 # define EX_IOERR 74 161 #endif 162 #ifndef EX_PROTOCOL 163 #define EX_PROTOCOL 76 164 #endif 165 166 167 #ifdef HAVE_SETPGRP_0 168 # define ntp_setpgrp(x, y) setpgrp() 169 #else 170 # define ntp_setpgrp(x, y) setpgrp(x, y) 171 #endif 172 173 #ifdef HAVE_SOLARIS_PRIVS 174 # define LOWPRIVS "basic,sys_time,net_privaddr,proc_setid,!proc_info,!proc_session,!proc_exec" 175 static priv_set_t *lowprivs = NULL; 176 static priv_set_t *highprivs = NULL; 177 #endif /* HAVE_SOLARIS_PRIVS */ 178 /* 179 * Scheduling priority we run at 180 */ 181 #define NTPD_PRIO (-12) 182 183 int priority_done = 2; /* 0 - Set priority */ 184 /* 1 - priority is OK where it is */ 185 /* 2 - Don't set priority */ 186 /* 1 and 2 are pretty much the same */ 187 188 int listen_to_virtual_ips = TRUE; 189 190 /* 191 * No-fork flag. If set, we do not become a background daemon. 192 */ 193 int nofork; /* Fork by default */ 194 195 #ifdef HAVE_DNSREGISTRATION 196 /* 197 * mDNS registration flag. If set, we attempt to register with the mDNS system, but only 198 * after we have synched the first time. If the attempt fails, then try again once per 199 * minute for up to 5 times. After all, we may be starting before mDNS. 200 */ 201 int mdnsreg = FALSE; 202 int mdnstries = 5; 203 #endif /* HAVE_DNSREGISTRATION */ 204 205 #ifdef HAVE_LINUX_CAPABILITIES 206 int have_caps; /* runtime check whether capabilities work */ 207 #endif /* HAVE_LINUX_CAPABILITIES */ 208 209 #ifdef HAVE_DROPROOT 210 int droproot; 211 int root_dropped; 212 char *user; /* User to switch to */ 213 char *group; /* group to switch to */ 214 const char *chrootdir; /* directory to chroot to */ 215 uid_t sw_uid; 216 gid_t sw_gid; 217 struct group *gr; 218 struct passwd *pw; 219 #endif /* HAVE_DROPROOT */ 220 221 #ifdef HAVE_WORKING_FORK 222 int daemon_pipe[2] = { -1, -1 }; 223 #endif 224 225 /* 226 * Version declaration 227 */ 228 extern const char *Version; 229 230 char const *progname; 231 232 int was_alarmed; 233 234 #ifdef DECL_SYSCALL 235 /* 236 * We put this here, since the argument profile is syscall-specific 237 */ 238 extern int syscall (int, ...); 239 #endif /* DECL_SYSCALL */ 240 241 242 #if !defined(SIM) && defined(SIGDIE1) 243 static volatile int signalled = 0; 244 static volatile int signo = 0; 245 246 /* In an ideal world, 'finish_safe()' would declared as noreturn... */ 247 static void finish_safe (int); 248 static RETSIGTYPE finish (int); 249 #endif 250 251 #if !defined(SIM) && defined(HAVE_WORKING_FORK) 252 static int wait_child_sync_if (int, unsigned long); 253 static int wait_child_exit_if (pid_t, int); 254 #endif 255 256 #if !defined(SIM) && !defined(SYS_WINNT) 257 # ifdef DEBUG 258 static RETSIGTYPE moredebug (int); 259 static RETSIGTYPE lessdebug (int); 260 # else /* !DEBUG follows */ 261 static RETSIGTYPE no_debug (int); 262 # endif /* !DEBUG */ 263 #endif /* !SIM && !SYS_WINNT */ 264 265 #ifndef WORK_FORK 266 int saved_argc; 267 char ** saved_argv; 268 #endif 269 270 #ifndef SIM 271 int ntpdmain (int, char **); 272 static void set_process_priority (void); 273 static void assertion_failed (const char *, int, 274 isc_assertiontype_t, 275 const char *) 276 __attribute__ ((__noreturn__)); 277 static void library_fatal_error (const char *, int, 278 const char *, va_list) 279 ISC_FORMAT_PRINTF(3, 0); 280 static void library_unexpected_error(const char *, int, 281 const char *, va_list) 282 ISC_FORMAT_PRINTF(3, 0); 283 #endif /* !SIM */ 284 285 286 /* Bug2332 unearthed a problem in the interaction of reduced user 287 * privileges, the limits on memory usage and some versions of the 288 * pthread library on Linux systems. The 'pthread_cancel()' function and 289 * likely some others need to track the stack of the thread involved, 290 * and uses a function that comes from GCC (--> libgcc_s.so) to do 291 * this. Unfortunately the developers of glibc decided to load the 292 * library on demand, which speeds up program start but can cause 293 * trouble here: Due to all the things NTPD does to limit its resource 294 * usage, this deferred load of libgcc_s does not always work once the 295 * restrictions are in effect. 296 * 297 * One way out of this was attempting a forced link against libgcc_s 298 * when possible because it makes the library available immediately 299 * without deferred load. (The symbol resolution would still be dynamic 300 * and on demand, but the code would already be in the process image.) 301 * 302 * This is a tricky thing to do, since it's not necessary everywhere, 303 * not possible everywhere, has shown to break the build of other 304 * programs in the NTP suite and is now generally frowned upon. 305 * 306 * So we take a different approach here: We creat a worker thread that does 307 * actually nothing except waiting for cancellation and cancel it. If 308 * this is done before all the limitations are put in place, the 309 * machinery is pre-heated and all the runtime stuff should be in place 310 * and useable when needed. 311 * 312 * This uses only the standard pthread API and should work with all 313 * implementations of pthreads. It is not necessary everywhere, but it's 314 * cheap enough to go on nearly unnoticed. 315 * 316 * Addendum: Bug 2954 showed that the assumption that this should work 317 * with all OS is wrong -- at least FreeBSD bombs heavily. 318 */ 319 #ifdef NEED_PTHREAD_WARMUP 320 321 /* simple thread function: sleep until cancelled, just to exercise 322 * thread cancellation. 323 */ 324 static void* 325 my_pthread_warmup_worker( 326 void *thread_args) 327 { 328 (void)thread_args; 329 for (;;) 330 sleep(10); 331 return NULL; 332 } 333 334 /* pre-heat threading: create a thread and cancel it, just to exercise 335 * thread cancellation. 336 */ 337 static void 338 my_pthread_warmup(void) 339 { 340 pthread_t thread; 341 pthread_attr_t thr_attr; 342 int rc; 343 344 pthread_attr_init(&thr_attr); 345 #if defined(HAVE_PTHREAD_ATTR_GETSTACKSIZE) && \ 346 defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE) && \ 347 defined(PTHREAD_STACK_MIN) 348 { 349 size_t ssmin = 32*1024; /* 32kB should be minimum */ 350 if (ssmin < PTHREAD_STACK_MIN) 351 ssmin = PTHREAD_STACK_MIN; 352 rc = pthread_attr_setstacksize(&thr_attr, ssmin); 353 if (0 != rc) 354 msyslog(LOG_ERR, 355 "my_pthread_warmup: pthread_attr_setstacksize() -> %s", 356 strerror(rc)); 357 } 358 #endif 359 rc = pthread_create( 360 &thread, &thr_attr, my_pthread_warmup_worker, NULL); 361 pthread_attr_destroy(&thr_attr); 362 if (0 != rc) { 363 msyslog(LOG_ERR, 364 "my_pthread_warmup: pthread_create() -> %s", 365 strerror(rc)); 366 } else { 367 pthread_cancel(thread); 368 pthread_join(thread, NULL); 369 } 370 } 371 372 #endif /*defined(NEED_PTHREAD_WARMUP)*/ 373 374 #ifdef NEED_EARLY_FORK 375 static void 376 dummy_callback(void) { return; } 377 378 static void 379 fork_nonchroot_worker(void) { 380 getaddrinfo_sometime("localhost", "ntp", NULL, INITIAL_DNS_RETRY, 381 (gai_sometime_callback)&dummy_callback, NULL); 382 } 383 #endif /* NEED_EARLY_FORK */ 384 385 void 386 parse_cmdline_opts( 387 int * pargc, 388 char ***pargv 389 ) 390 { 391 static int parsed; 392 static int optct; 393 394 if (!parsed) 395 optct = ntpOptionProcess(&ntpdOptions, *pargc, *pargv); 396 397 parsed = 1; 398 399 *pargc -= optct; 400 *pargv += optct; 401 } 402 403 404 #ifdef SIM 405 int 406 main( 407 int argc, 408 char *argv[] 409 ) 410 { 411 progname = argv[0]; 412 parse_cmdline_opts(&argc, &argv); 413 #ifdef DEBUG 414 debug = OPT_VALUE_SET_DEBUG_LEVEL; 415 DPRINTF(1, ("%s\n", Version)); 416 #endif 417 418 return ntpsim(argc, argv); 419 } 420 #elif defined(NO_MAIN_ALLOWED) 421 CALL(ntpd,"ntpd",ntpdmain); 422 #elif !defined(SYS_WINNT) 423 int 424 main( 425 int argc, 426 char *argv[] 427 ) 428 { 429 # ifdef DISABLE_FREEBSD_STACKGAP 430 /* 431 * We must disable ASLR stack gap on FreeBSD that has 432 * PROC_STACKGAP_DISABLE up through early FreeBSD 14 433 * versions to avoid a segfault. See: 434 * 435 * https://bugs.ntp.org/3627 436 * https://cgit.freebsd.org/src/commit/?id=889b56c8cd84c9a9f2d9e3b019c154d6f14d9021 437 * https://cgit.freebsd.org/src/commit/?id=fc393054398ea50fb0cee52704e9385afe888b48 438 * https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253208 439 * https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241421 440 * https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241960 441 */ 442 int aslr_var = PROC_STACKGAP_DISABLE; 443 444 procctl(P_PID, getpid(), PROC_STACKGAP_CTL, &aslr_var); 445 # endif /* DISABLE_FREEBSD_STACKGAP */ 446 447 return ntpdmain(argc, argv); 448 } 449 #endif /* !SYS_WINNT */ 450 451 #ifdef _AIX 452 /* 453 * OK. AIX is different than solaris in how it implements plock(). 454 * If you do NOT adjust the stack limit, you will get the MAXIMUM 455 * stack size allocated and PINNED with you program. To check the 456 * value, use ulimit -a. 457 * 458 * To fix this, we create an automatic variable and set our stack limit 459 * to that PLUS 32KB of extra space (we need some headroom). 460 * 461 * This subroutine gets the stack address. 462 * 463 * Grover Davidson and Matt Ladendorf 464 * 465 */ 466 static char * 467 get_aix_stack(void) 468 { 469 char ch; 470 return (&ch); 471 } 472 473 /* 474 * Signal handler for SIGDANGER. 475 */ 476 static void 477 catch_danger(int signo) 478 { 479 msyslog(LOG_INFO, "ntpd: setpgid(): %m"); 480 /* Make the system believe we'll free something, but don't do it! */ 481 return; 482 } 483 #endif /* _AIX */ 484 485 /* 486 * Set the process priority 487 */ 488 #ifndef SIM 489 static void 490 set_process_priority(void) 491 { 492 493 # ifdef DEBUG 494 if (debug > 1) 495 msyslog(LOG_DEBUG, "set_process_priority: %s: priority_done is <%d>", 496 ((priority_done) 497 ? "Leave priority alone" 498 : "Attempt to set priority" 499 ), 500 priority_done); 501 # endif /* DEBUG */ 502 503 # if defined(HAVE_SCHED_SETSCHEDULER) 504 if (!priority_done) { 505 extern int config_priority_override, config_priority; 506 int pmax, pmin; 507 struct sched_param sched; 508 509 pmax = sched_get_priority_max(SCHED_FIFO); 510 sched.sched_priority = pmax; 511 if ( config_priority_override ) { 512 pmin = sched_get_priority_min(SCHED_FIFO); 513 if ( config_priority > pmax ) 514 sched.sched_priority = pmax; 515 else if ( config_priority < pmin ) 516 sched.sched_priority = pmin; 517 else 518 sched.sched_priority = config_priority; 519 } 520 if ( sched_setscheduler(0, SCHED_FIFO, &sched) == -1 ) 521 msyslog(LOG_ERR, "sched_setscheduler(): %m"); 522 else 523 ++priority_done; 524 } 525 # endif /* HAVE_SCHED_SETSCHEDULER */ 526 # ifdef HAVE_RTPRIO 527 # ifdef RTP_SET 528 if (!priority_done) { 529 struct rtprio srtp; 530 531 srtp.type = RTP_PRIO_REALTIME; /* was: RTP_PRIO_NORMAL */ 532 srtp.prio = 0; /* 0 (hi) -> RTP_PRIO_MAX (31,lo) */ 533 534 if (rtprio(RTP_SET, getpid(), &srtp) < 0) 535 msyslog(LOG_ERR, "rtprio() error: %m"); 536 else 537 ++priority_done; 538 } 539 # else /* !RTP_SET follows */ 540 if (!priority_done) { 541 if (rtprio(0, 120) < 0) 542 msyslog(LOG_ERR, "rtprio() error: %m"); 543 else 544 ++priority_done; 545 } 546 # endif /* !RTP_SET */ 547 # endif /* HAVE_RTPRIO */ 548 # if defined(NTPD_PRIO) && NTPD_PRIO != 0 549 # ifdef HAVE_ATT_NICE 550 if (!priority_done) { 551 errno = 0; 552 if (-1 == nice (NTPD_PRIO) && errno != 0) 553 msyslog(LOG_ERR, "nice() error: %m"); 554 else 555 ++priority_done; 556 } 557 # endif /* HAVE_ATT_NICE */ 558 # ifdef HAVE_BSD_NICE 559 if (!priority_done) { 560 if (-1 == setpriority(PRIO_PROCESS, 0, NTPD_PRIO)) 561 msyslog(LOG_ERR, "setpriority() error: %m"); 562 else 563 ++priority_done; 564 } 565 # endif /* HAVE_BSD_NICE */ 566 # endif /* NTPD_PRIO && NTPD_PRIO != 0 */ 567 if (!priority_done) 568 msyslog(LOG_ERR, "set_process_priority: No way found to improve our priority"); 569 } 570 #endif /* !SIM */ 571 572 #if !defined(SIM) && !defined(SYS_WINNT) 573 /* 574 * Detach from terminal (much like daemon()) 575 * Nothe that this function calls exit() 576 */ 577 # ifdef HAVE_WORKING_FORK 578 static void 579 detach_from_terminal( 580 int pipes[2], 581 long wait_sync, 582 const char *logfilename 583 ) 584 { 585 pid_t cpid; 586 int exit_code; 587 # if !defined(HAVE_SETSID) && !defined (HAVE_SETPGID) && defined(TIOCNOTTY) 588 int fid; 589 # endif 590 # ifdef _AIX 591 struct sigaction sa; 592 # endif 593 594 cpid = fork(); 595 if (0 != cpid) { 596 /* parent */ 597 if (-1 == cpid) { 598 msyslog(LOG_ERR, "fork: %m"); 599 exit_code = EX_OSERR; 600 } else { 601 close(pipes[1]); 602 pipes[1] = -1; 603 exit_code = wait_child_sync_if( 604 pipes[0], wait_sync); 605 if (exit_code <= 0) { 606 /* probe daemon exit code -- wait for 607 * child process if we have an unexpected 608 * EOF on the monitor pipe. 609 */ 610 exit_code = wait_child_exit_if( 611 cpid, (exit_code < 0)); 612 } 613 } 614 exit(exit_code); 615 } 616 617 /* 618 * child/daemon 619 * close all open files excepting waitsync_fd_to_close. 620 * msyslog() unreliable until after init_logging(). 621 */ 622 closelog(); 623 if (syslog_file != NULL) { 624 fclose(syslog_file); 625 syslog_file = NULL; 626 syslogit = TRUE; 627 } 628 close_all_except(pipes[1]); 629 pipes[0] = -1; 630 INSIST(0 == open("/dev/null", 0) && 1 == dup2(0, 1) \ 631 && 2 == dup2(0, 2)); 632 633 init_logging(progname, 0, TRUE); 634 /* we lost our logfile (if any) daemonizing */ 635 setup_logfile(logfilename); 636 637 # ifdef SYS_DOMAINOS 638 { 639 uid_$t puid; 640 status_$t st; 641 642 proc2_$who_am_i(&puid); 643 proc2_$make_server(&puid, &st); 644 } 645 # endif /* SYS_DOMAINOS */ 646 # ifdef HAVE_SETSID 647 if (setsid() == (pid_t)-1) 648 msyslog(LOG_ERR, "setsid(): %m"); 649 # elif defined(HAVE_SETPGID) 650 if (setpgid(0, 0) == -1) 651 msyslog(LOG_ERR, "setpgid(): %m"); 652 # else /* !HAVE_SETSID && !HAVE_SETPGID follows */ 653 # ifdef TIOCNOTTY 654 fid = open("/dev/tty", 2); 655 if (fid >= 0) { 656 ioctl(fid, (u_long)TIOCNOTTY, NULL); 657 close(fid); 658 } 659 # endif /* TIOCNOTTY */ 660 ntp_setpgrp(0, getpid()); 661 # endif /* !HAVE_SETSID && !HAVE_SETPGID */ 662 # ifdef _AIX 663 /* Don't get killed by low-on-memory signal. */ 664 sa.sa_handler = catch_danger; 665 sigemptyset(&sa.sa_mask); 666 sa.sa_flags = SA_RESTART; 667 sigaction(SIGDANGER, &sa, NULL); 668 # endif /* _AIX */ 669 670 return; 671 } 672 # endif /* HAVE_WORKING_FORK */ 673 #endif /* !SIM && !SYS_WINNT */ 674 675 #ifdef HAVE_DROPROOT 676 /* 677 * Map user name/number to user ID 678 */ 679 static int 680 map_user(void) 681 { 682 char *endp; 683 684 if (isdigit((unsigned char)*user)) { 685 sw_uid = (uid_t)strtoul(user, &endp, 0); 686 if (*endp != '\0') 687 goto getuser; 688 689 if ((pw = getpwuid(sw_uid)) != NULL) { 690 free(user); 691 user = estrdup(pw->pw_name); 692 sw_gid = pw->pw_gid; 693 } else { 694 errno = 0; 695 msyslog(LOG_ERR, "Cannot find user ID %s", user); 696 return 0; 697 } 698 699 } else { 700 getuser: 701 errno = 0; 702 if ((pw = getpwnam(user)) != NULL) { 703 sw_uid = pw->pw_uid; 704 sw_gid = pw->pw_gid; 705 } else { 706 if (errno) 707 msyslog(LOG_ERR, "getpwnam(%s) failed: %m", user); 708 else 709 msyslog(LOG_ERR, "Cannot find user `%s'", user); 710 return 0; 711 } 712 } 713 714 return 1; 715 } 716 717 /* 718 * Map group name/number to group ID 719 */ 720 static int 721 map_group(void) 722 { 723 char *endp; 724 725 if (isdigit((unsigned char)*group)) { 726 sw_gid = (gid_t)strtoul(group, &endp, 0); 727 if (*endp != '\0') 728 goto getgroup; 729 } else { 730 getgroup: 731 if ((gr = getgrnam(group)) != NULL) { 732 sw_gid = gr->gr_gid; 733 } else { 734 errno = 0; 735 msyslog(LOG_ERR, "Cannot find group `%s'", group); 736 return 0; 737 } 738 } 739 740 return 1; 741 } 742 743 static int 744 set_group_ids(void) 745 { 746 if (user && initgroups(user, sw_gid)) { 747 msyslog(LOG_ERR, "Cannot initgroups() to user `%s': %m", user); 748 return 0; 749 } 750 if (group && setgid(sw_gid)) { 751 msyslog(LOG_ERR, "Cannot setgid() to group `%s': %m", group); 752 return 0; 753 } 754 if (group && setegid(sw_gid)) { 755 msyslog(LOG_ERR, "Cannot setegid() to group `%s': %m", group); 756 return 0; 757 } 758 if (group) { 759 if (0 != setgroups(1, &sw_gid)) { 760 msyslog(LOG_ERR, "setgroups(1, %d) failed: %m", sw_gid); 761 return 0; 762 } 763 } 764 else if (pw) 765 if (0 != initgroups(pw->pw_name, pw->pw_gid)) { 766 msyslog(LOG_ERR, "initgroups(<%s>, %d) filed: %m", pw->pw_name, pw->pw_gid); 767 return 0; 768 } 769 return 1; 770 } 771 772 static int 773 set_user_ids(void) 774 { 775 if (user && setuid(sw_uid)) { 776 msyslog(LOG_ERR, "Cannot setuid() to user `%s': %m", user); 777 return 0; 778 } 779 if (user && seteuid(sw_uid)) { 780 msyslog(LOG_ERR, "Cannot seteuid() to user `%s': %m", user); 781 return 0; 782 } 783 return 1; 784 } 785 786 /* 787 * Change (effective) user and group IDs, also initialize the supplementary group access list 788 */ 789 int set_user_group_ids(void); 790 int 791 set_user_group_ids(void) 792 { 793 /* If the the user was already mapped, no need to map it again */ 794 if ((NULL != user) && (0 == sw_uid)) { 795 if (0 == map_user()) 796 exit (-1); 797 } 798 /* same applies for the group */ 799 if ((NULL != group) && (0 == sw_gid)) { 800 if (0 == map_group()) 801 exit (-1); 802 } 803 804 if (getegid() != sw_gid && 0 == set_group_ids()) 805 return 0; 806 if (geteuid() != sw_uid && 0 == set_user_ids()) 807 return 0; 808 809 return 1; 810 } 811 #endif /* HAVE_DROPROOT */ 812 813 /* 814 * Main program. Initialize us, disconnect us from the tty if necessary, 815 * and loop waiting for I/O and/or timer expiries. 816 */ 817 #ifndef SIM 818 int 819 ntpdmain( 820 int argc, 821 char *argv[] 822 ) 823 { 824 l_fp now; 825 struct recvbuf *rbuf; 826 const char * logfilename; 827 # ifdef HAVE_UMASK 828 mode_t uv; 829 # endif 830 # if defined(HAVE_GETUID) && !defined(MPE) /* MPE lacks the concept of root */ 831 uid_t uid; 832 # endif 833 # if defined(HAVE_WORKING_FORK) 834 long wait_sync = 0; 835 # endif /* HAVE_WORKING_FORK*/ 836 # ifdef SCO5_CLOCK 837 int fd; 838 int zero; 839 # endif 840 841 # ifdef NEED_PTHREAD_WARMUP 842 my_pthread_warmup(); 843 # endif 844 845 # ifdef HAVE_UMASK 846 uv = umask(0); 847 if (uv) 848 umask(uv); 849 else 850 umask(022); 851 # endif 852 saved_argc = argc; 853 saved_argv = argv; 854 progname = argv[0]; 855 initializing = TRUE; /* mark that we are initializing */ 856 parse_cmdline_opts(&argc, &argv); 857 # ifdef DEBUG 858 debug = OPT_VALUE_SET_DEBUG_LEVEL; 859 # ifdef HAVE_SETLINEBUF 860 setlinebuf(stdout); 861 # endif 862 # endif 863 864 if (HAVE_OPT(NOFORK) || HAVE_OPT(QUIT) 865 # ifdef DEBUG 866 || debug 867 # endif 868 || HAVE_OPT(SAVECONFIGQUIT)) 869 nofork = TRUE; 870 871 init_logging(progname, NLOG_SYNCMASK, TRUE); 872 /* honor -l/--logfile option to log to a file */ 873 if (HAVE_OPT(LOGFILE)) { 874 logfilename = OPT_ARG(LOGFILE); 875 syslogit = FALSE; 876 change_logfile(logfilename, FALSE); 877 } else { 878 logfilename = NULL; 879 if (nofork) 880 msyslog_term = TRUE; 881 if (HAVE_OPT(SAVECONFIGQUIT)) 882 syslogit = FALSE; 883 } 884 msyslog(LOG_NOTICE, "%s: Starting", Version); 885 886 { 887 int i; 888 char buf[1024]; /* Secret knowledge of msyslog buf length */ 889 char *cp = buf; 890 891 /* Note that every arg has an initial space character */ 892 snprintf(cp, sizeof(buf), "Command line:"); 893 cp += strlen(cp); 894 895 for (i = 0; i < saved_argc ; ++i) { 896 snprintf(cp, sizeof(buf) - (cp - buf), 897 " %s", saved_argv[i]); 898 cp += strlen(cp); 899 } 900 msyslog(LOG_NOTICE, "%s", buf); 901 } 902 903 msyslog(LOG_NOTICE, "----------------------------------------------------"); 904 msyslog(LOG_NOTICE, "ntp-4 is maintained by Network Time Foundation,"); 905 msyslog(LOG_NOTICE, "Inc. (NTF), a non-profit 501(c)(3) public-benefit"); 906 msyslog(LOG_NOTICE, "corporation. Support and training for ntp-4 are"); 907 msyslog(LOG_NOTICE, "available at https://www.nwtime.org/support"); 908 msyslog(LOG_NOTICE, "----------------------------------------------------"); 909 #ifdef DEBUG 910 msyslog(LOG_NOTICE, "DEBUG behavior is enabled - a violation of any" 911 " diagnostic assertion will cause %s to abort", 912 progname); 913 #endif 914 915 ssl_check_version(); 916 917 /* 918 * Install trap handlers to log errors and assertion failures. 919 * Default handlers print to stderr which doesn't work if detached. 920 */ 921 isc_assertion_setcallback(assertion_failed); 922 isc_error_setfatal(library_fatal_error); 923 isc_error_setunexpected(library_unexpected_error); 924 925 /* MPE lacks the concept of root */ 926 # if defined(HAVE_GETUID) && !defined(MPE) 927 uid = getuid(); 928 if (uid && !HAVE_OPT( SAVECONFIGQUIT ) 929 # if defined(HAVE_TRUSTEDBSD_MAC) 930 /* We can run as non-root if the mac_ntpd policy is enabled. */ 931 && mac_is_present("ntpd") != 1 932 # endif 933 ) { 934 msyslog_term = TRUE; 935 msyslog(LOG_ERR, 936 "must be run as root, not uid %ld", (long)uid); 937 exit(1); 938 } 939 # endif 940 941 /* 942 * Enable the Multi-Media Timer for Windows? 943 */ 944 # ifdef SYS_WINNT 945 if (HAVE_OPT( MODIFYMMTIMER )) 946 set_mm_timer(MM_TIMER_HIRES); 947 # endif 948 949 #ifdef HAVE_DNSREGISTRATION 950 /* 951 * Enable mDNS registrations? 952 */ 953 if (HAVE_OPT( MDNS )) { 954 mdnsreg = TRUE; 955 } 956 #endif /* HAVE_DNSREGISTRATION */ 957 958 if (HAVE_OPT( NOVIRTUALIPS )) 959 listen_to_virtual_ips = 0; 960 961 /* 962 * --interface, listen on specified interfaces 963 */ 964 if (HAVE_OPT( INTERFACE )) { 965 int ifacect = STACKCT_OPT( INTERFACE ); 966 const char** ifaces = STACKLST_OPT( INTERFACE ); 967 sockaddr_u addr; 968 969 while (ifacect-- > 0) { 970 add_nic_rule( 971 is_ip_address(*ifaces, AF_UNSPEC, &addr) 972 ? MATCH_IFADDR 973 : MATCH_IFNAME, 974 *ifaces, -1, ACTION_LISTEN); 975 ifaces++; 976 } 977 } 978 979 if (HAVE_OPT( NICE )) 980 priority_done = 0; 981 982 # ifdef HAVE_SCHED_SETSCHEDULER 983 if (HAVE_OPT( PRIORITY )) { 984 config_priority = OPT_VALUE_PRIORITY; 985 config_priority_override = 1; 986 priority_done = 0; 987 } 988 # endif 989 990 # ifdef HAVE_WORKING_FORK 991 /* make sure the FDs are initialised 992 * 993 * note: if WAIT_SYNC is requested, we *have* to fork. This will 994 * overide any '-n' (nofork) or '-d' (debug) option presented on 995 * the command line! 996 */ 997 if (HAVE_OPT(WAIT_SYNC)) { 998 wait_sync = OPT_VALUE_WAIT_SYNC; 999 if (wait_sync <= 0) 1000 wait_sync = 0; 1001 else 1002 nofork = FALSE; 1003 } 1004 if ( !nofork && pipe(daemon_pipe)) { 1005 msyslog(LOG_ERR, 1006 "Pipe creation failed for --wait-sync/daemon: %m"); 1007 exit(EX_OSERR); 1008 } 1009 # endif /* HAVE_WORKING_FORK */ 1010 1011 init_lib(); 1012 # ifdef SYS_WINNT 1013 /* 1014 * Make sure the service is initialized before we do anything else 1015 */ 1016 ntservice_init(); 1017 1018 /* 1019 * Start interpolation thread, must occur before first 1020 * get_systime() 1021 */ 1022 init_winnt_time(); 1023 # endif 1024 /* 1025 * Initialize random generator and public key pair 1026 */ 1027 get_systime(&now); 1028 1029 ntp_srandom((int)(now.l_i * now.l_uf)); 1030 1031 /* 1032 * Detach us from the terminal. May need an #ifndef GIZMO. 1033 */ 1034 # ifdef HAVE_WORKING_FORK 1035 if (!nofork) { 1036 detach_from_terminal(daemon_pipe, wait_sync, logfilename); 1037 } 1038 # endif /* HAVE_WORKING_FORK */ 1039 1040 # ifdef SCO5_CLOCK 1041 /* 1042 * SCO OpenServer's system clock offers much more precise timekeeping 1043 * on the base CPU than the other CPUs (for multiprocessor systems), 1044 * so we must lock to the base CPU. 1045 */ 1046 fd = open("/dev/at1", O_RDONLY); 1047 if (fd >= 0) { 1048 zero = 0; 1049 if (ioctl(fd, ACPU_LOCK, &zero) < 0) 1050 msyslog(LOG_ERR, "cannot lock to base CPU: %m"); 1051 close(fd); 1052 } 1053 # endif 1054 1055 /* Setup stack size in preparation for locking pages in memory. */ 1056 # if defined(HAVE_MLOCKALL) 1057 # ifdef HAVE_SETRLIMIT 1058 ntp_rlimit(RLIMIT_STACK, DFLT_RLIMIT_STACK * 4096, 4096, "4k"); 1059 # ifdef RLIMIT_MEMLOCK 1060 /* 1061 * The default RLIMIT_MEMLOCK is very low on Linux systems. 1062 * Unless we increase this limit malloc calls are likely to 1063 * fail if we drop root privilege. To be useful the value 1064 * has to be larger than the largest ntpd resident set size. 1065 */ 1066 ntp_rlimit(RLIMIT_MEMLOCK, DFLT_RLIMIT_MEMLOCK * 1024 * 1024, 1024 * 1024, "MB"); 1067 # endif /* RLIMIT_MEMLOCK */ 1068 # endif /* HAVE_SETRLIMIT */ 1069 # else /* !HAVE_MLOCKALL follows */ 1070 # ifdef HAVE_PLOCK 1071 # ifdef PROCLOCK 1072 # ifdef _AIX 1073 /* 1074 * set the stack limit for AIX for plock(). 1075 * see get_aix_stack() for more info. 1076 */ 1077 if (ulimit(SET_STACKLIM, (get_aix_stack() - 8 * 4096)) < 0) 1078 msyslog(LOG_ERR, 1079 "Cannot adjust stack limit for plock: %m"); 1080 # endif /* _AIX */ 1081 # endif /* PROCLOCK */ 1082 # endif /* HAVE_PLOCK */ 1083 # endif /* !HAVE_MLOCKALL */ 1084 1085 /* 1086 * Set up signals we pay attention to locally. 1087 */ 1088 # ifdef SIGDIE1 1089 signal_no_reset(SIGDIE1, finish); 1090 signal_no_reset(SIGDIE2, finish); 1091 signal_no_reset(SIGDIE3, finish); 1092 signal_no_reset(SIGDIE4, finish); 1093 # endif 1094 # ifdef SIGBUS 1095 signal_no_reset(SIGBUS, finish); 1096 # endif 1097 1098 # if !defined(SYS_WINNT) && !defined(VMS) 1099 # ifdef DEBUG 1100 (void) signal_no_reset(MOREDEBUGSIG, moredebug); 1101 (void) signal_no_reset(LESSDEBUGSIG, lessdebug); 1102 # else 1103 (void) signal_no_reset(MOREDEBUGSIG, no_debug); 1104 (void) signal_no_reset(LESSDEBUGSIG, no_debug); 1105 # endif /* DEBUG */ 1106 # endif /* !SYS_WINNT && !VMS */ 1107 1108 /* 1109 * Set up signals we should never pay attention to. 1110 */ 1111 # ifdef SIGPIPE 1112 signal_no_reset(SIGPIPE, SIG_IGN); 1113 # endif 1114 1115 /* 1116 * Call the init_ routines to initialize the data structures. 1117 * 1118 * Exactly what command-line options are we expecting here? 1119 */ 1120 INIT_SSL(); 1121 init_auth(); 1122 init_util(); 1123 init_restrict(); 1124 init_mon(); 1125 init_timer(); 1126 init_request(); 1127 init_control(); 1128 init_peer(); 1129 # ifdef REFCLOCK 1130 init_refclock(); 1131 # endif 1132 set_process_priority(); 1133 init_proto(); /* Call at high priority */ 1134 init_io(); 1135 init_loopfilter(); 1136 mon_start(MON_ON); /* monitor on by default now */ 1137 /* turn off in config if unwanted */ 1138 1139 /* 1140 * Get the configuration. This is done in a separate module 1141 * since this will definitely be different for the gizmo board. 1142 */ 1143 getconfig(argc, argv); 1144 1145 if (-1 == cur_memlock) { 1146 # if defined(HAVE_MLOCKALL) 1147 /* 1148 * lock the process into memory 1149 */ 1150 if ( !HAVE_OPT(SAVECONFIGQUIT) 1151 # ifdef RLIMIT_MEMLOCK 1152 && -1 != DFLT_RLIMIT_MEMLOCK 1153 # endif 1154 && 0 != mlockall(MCL_CURRENT|MCL_FUTURE)) 1155 msyslog(LOG_ERR, "mlockall(): %m"); 1156 # else /* !HAVE_MLOCKALL follows */ 1157 # ifdef HAVE_PLOCK 1158 # ifdef PROCLOCK 1159 /* 1160 * lock the process into memory 1161 */ 1162 if (!HAVE_OPT(SAVECONFIGQUIT) && 0 != plock(PROCLOCK)) 1163 msyslog(LOG_ERR, "plock(PROCLOCK): %m"); 1164 # else /* !PROCLOCK follows */ 1165 # ifdef TXTLOCK 1166 /* 1167 * Lock text into ram 1168 */ 1169 if (!HAVE_OPT(SAVECONFIGQUIT) && 0 != plock(TXTLOCK)) 1170 msyslog(LOG_ERR, "plock(TXTLOCK) error: %m"); 1171 # else /* !TXTLOCK follows */ 1172 msyslog(LOG_ERR, "plock() - don't know what to lock!"); 1173 # endif /* !TXTLOCK */ 1174 # endif /* !PROCLOCK */ 1175 # endif /* HAVE_PLOCK */ 1176 # endif /* !HAVE_MLOCKALL */ 1177 } 1178 1179 loop_config(LOOP_DRIFTINIT, 0); 1180 report_event(EVNT_SYSRESTART, NULL, NULL); 1181 initializing = FALSE; 1182 1183 # ifdef HAVE_LINUX_CAPABILITIES 1184 { 1185 /* Check that setting capabilities actually works; we might be 1186 * run on a kernel with disabled capabilities. We must not 1187 * drop privileges in this case. 1188 */ 1189 cap_t caps; 1190 caps = cap_from_text("cap_sys_time,cap_setuid,cap_setgid,cap_sys_chroot,cap_net_bind_service=pe"); 1191 if ( ! caps) { 1192 msyslog( LOG_ERR, "cap_from_text() failed: %m" ); 1193 exit(-1); 1194 } 1195 have_caps = (cap_set_proc(caps) == 0); 1196 cap_free(caps); /* caps not NULL here! */ 1197 } 1198 # endif /* HAVE_LINUX_CAPABILITIES */ 1199 1200 # ifdef HAVE_DROPROOT 1201 # ifdef HAVE_LINUX_CAPABILITIES 1202 if (droproot && have_caps) { 1203 # else 1204 if (droproot) { 1205 # endif /*HAVE_LINUX_CAPABILITIES*/ 1206 1207 # ifdef NEED_EARLY_FORK 1208 fork_nonchroot_worker(); 1209 # endif 1210 1211 /* Drop super-user privileges and chroot now if the OS supports this */ 1212 1213 # ifdef HAVE_LINUX_CAPABILITIES 1214 /* set flag: keep privileges accross setuid() call (we only really need cap_sys_time): */ 1215 if (prctl( PR_SET_KEEPCAPS, 1L, 0L, 0L, 0L ) == -1) { 1216 msyslog( LOG_ERR, "prctl( PR_SET_KEEPCAPS, 1L ) failed: %m" ); 1217 exit(-1); 1218 } 1219 # elif HAVE_SOLARIS_PRIVS 1220 /* Nothing to do here */ 1221 # else 1222 /* we need a user to switch to */ 1223 if (user == NULL) { 1224 msyslog(LOG_ERR, "Need user name to drop root privileges (see -u flag!)" ); 1225 exit(-1); 1226 } 1227 # endif /* HAVE_LINUX_CAPABILITIES || HAVE_SOLARIS_PRIVS */ 1228 1229 if (user != NULL) { 1230 if (0 == map_user()) 1231 exit (-1); 1232 } 1233 if (group != NULL) { 1234 if (0 == map_group()) 1235 exit (-1); 1236 } 1237 1238 if (chrootdir ) { 1239 /* make sure cwd is inside the jail: */ 1240 if (chdir(chrootdir)) { 1241 msyslog(LOG_ERR, "Cannot chdir() to `%s': %m", chrootdir); 1242 exit (-1); 1243 } 1244 if (chroot(chrootdir)) { 1245 msyslog(LOG_ERR, "Cannot chroot() to `%s': %m", chrootdir); 1246 exit (-1); 1247 } 1248 if (chdir("/")) { 1249 msyslog(LOG_ERR, "Cannot chdir() to`root after chroot(): %m"); 1250 exit (-1); 1251 } 1252 } 1253 # ifdef HAVE_SOLARIS_PRIVS 1254 if ((lowprivs = priv_str_to_set(LOWPRIVS, ",", NULL)) == NULL) { 1255 msyslog(LOG_ERR, "priv_str_to_set() failed:%m"); 1256 exit(-1); 1257 } 1258 if ((highprivs = priv_allocset()) == NULL) { 1259 msyslog(LOG_ERR, "priv_allocset() failed:%m"); 1260 exit(-1); 1261 } 1262 (void) getppriv(PRIV_PERMITTED, highprivs); 1263 (void) priv_intersect(highprivs, lowprivs); 1264 if (setppriv(PRIV_SET, PRIV_PERMITTED, lowprivs) == -1) { 1265 msyslog(LOG_ERR, "setppriv() failed:%m"); 1266 exit(-1); 1267 } 1268 # endif /* HAVE_SOLARIS_PRIVS */ 1269 if (0 == set_user_group_ids()) 1270 exit(-1); 1271 1272 # if defined(HAVE_TRUSTEDBSD_MAC) 1273 /* 1274 * To manipulate system time and (re-)bind to NTP_PORT as needed 1275 * following interface changes, we must either run as uid 0 or 1276 * the mac_ntpd policy module must be enabled. 1277 */ 1278 if (sw_uid != 0 && mac_is_present("ntpd") != 1) { 1279 msyslog(LOG_ERR, "Need MAC 'ntpd' policy enabled to drop root privileges"); 1280 exit (-1); 1281 } 1282 # elif !defined(HAVE_LINUX_CAPABILITIES) && !defined(HAVE_SOLARIS_PRIVS) 1283 /* 1284 * for now assume that the privilege to bind to privileged ports 1285 * is associated with running with uid 0 - should be refined on 1286 * ports that allow binding to NTP_PORT with uid != 0 1287 */ 1288 scan_addrs_once |= (sw_uid != 0); /* used by routing socket code */ 1289 # endif /* !HAVE_LINUX_CAPABILITIES && !HAVE_SOLARIS_PRIVS */ 1290 1291 if (scan_addrs_once) { 1292 msyslog(LOG_INFO, "running as non-root disables dynamic interface tracking"); 1293 } 1294 1295 # ifdef HAVE_LINUX_CAPABILITIES 1296 { 1297 /* 1298 * We may be running under non-root uid now, but we still hold full root privileges! 1299 * We drop all of them, except for the crucial one or two: cap_sys_time and 1300 * cap_net_bind_service if doing dynamic interface tracking. 1301 */ 1302 cap_t caps; 1303 char *captext; 1304 1305 captext = (scan_addrs_once) 1306 ? "cap_sys_time=pe" 1307 : "cap_sys_time,cap_net_bind_service=pe"; 1308 caps = cap_from_text(captext); 1309 if (!caps) { 1310 msyslog(LOG_ERR, 1311 "cap_from_text(%s) failed: %m", 1312 captext); 1313 exit(-1); 1314 } 1315 if (-1 == cap_set_proc(caps)) { 1316 msyslog(LOG_ERR, 1317 "cap_set_proc() failed to drop root privs: %m"); 1318 exit(-1); 1319 } 1320 cap_free(caps); 1321 } 1322 # endif /* HAVE_LINUX_CAPABILITIES */ 1323 # ifdef HAVE_SOLARIS_PRIVS 1324 if (priv_delset(lowprivs, "proc_setid") == -1) { 1325 msyslog(LOG_ERR, "priv_delset() failed:%m"); 1326 exit(-1); 1327 } 1328 if (setppriv(PRIV_SET, PRIV_PERMITTED, lowprivs) == -1) { 1329 msyslog(LOG_ERR, "setppriv() failed:%m"); 1330 exit(-1); 1331 } 1332 priv_freeset(lowprivs); 1333 priv_freeset(highprivs); 1334 # endif /* HAVE_SOLARIS_PRIVS */ 1335 root_dropped = TRUE; 1336 fork_deferred_worker(); 1337 } /* if (droproot) */ 1338 # endif /* HAVE_DROPROOT */ 1339 1340 /* libssecomp sandboxing */ 1341 #if defined (LIBSECCOMP) && (KERN_SECCOMP) 1342 scmp_filter_ctx ctx; 1343 1344 if ((ctx = seccomp_init(SCMP_ACT_KILL)) < 0) 1345 msyslog(LOG_ERR, "%s: seccomp_init(SCMP_ACT_KILL) failed: %m", __func__); 1346 else { 1347 msyslog(LOG_DEBUG, "%s: seccomp_init(SCMP_ACT_KILL) succeeded", __func__); 1348 } 1349 1350 #ifdef __x86_64__ 1351 int scmp_sc[] = { 1352 SCMP_SYS(adjtimex), 1353 SCMP_SYS(bind), 1354 SCMP_SYS(brk), 1355 SCMP_SYS(chdir), 1356 SCMP_SYS(clock_gettime), 1357 SCMP_SYS(clock_settime), 1358 SCMP_SYS(close), 1359 SCMP_SYS(connect), 1360 SCMP_SYS(exit_group), 1361 SCMP_SYS(fstat), 1362 SCMP_SYS(fsync), 1363 SCMP_SYS(futex), 1364 SCMP_SYS(getitimer), 1365 SCMP_SYS(getsockname), 1366 SCMP_SYS(ioctl), 1367 SCMP_SYS(lseek), 1368 SCMP_SYS(madvise), 1369 SCMP_SYS(mmap), 1370 SCMP_SYS(munmap), 1371 SCMP_SYS(open), 1372 SCMP_SYS(poll), 1373 SCMP_SYS(read), 1374 SCMP_SYS(recvmsg), 1375 SCMP_SYS(rename), 1376 SCMP_SYS(rt_sigaction), 1377 SCMP_SYS(rt_sigprocmask), 1378 SCMP_SYS(rt_sigreturn), 1379 SCMP_SYS(select), 1380 SCMP_SYS(sendto), 1381 SCMP_SYS(setitimer), 1382 SCMP_SYS(setsid), 1383 SCMP_SYS(socket), 1384 SCMP_SYS(stat), 1385 SCMP_SYS(time), 1386 SCMP_SYS(write), 1387 }; 1388 #endif 1389 #ifdef __i386__ 1390 int scmp_sc[] = { 1391 SCMP_SYS(_newselect), 1392 SCMP_SYS(adjtimex), 1393 SCMP_SYS(brk), 1394 SCMP_SYS(chdir), 1395 SCMP_SYS(clock_gettime), 1396 SCMP_SYS(clock_settime), 1397 SCMP_SYS(close), 1398 SCMP_SYS(exit_group), 1399 SCMP_SYS(fsync), 1400 SCMP_SYS(futex), 1401 SCMP_SYS(getitimer), 1402 SCMP_SYS(madvise), 1403 SCMP_SYS(mmap), 1404 SCMP_SYS(mmap2), 1405 SCMP_SYS(munmap), 1406 SCMP_SYS(open), 1407 SCMP_SYS(poll), 1408 SCMP_SYS(read), 1409 SCMP_SYS(rename), 1410 SCMP_SYS(rt_sigaction), 1411 SCMP_SYS(rt_sigprocmask), 1412 SCMP_SYS(select), 1413 SCMP_SYS(setitimer), 1414 SCMP_SYS(setsid), 1415 SCMP_SYS(sigprocmask), 1416 SCMP_SYS(sigreturn), 1417 SCMP_SYS(socketcall), 1418 SCMP_SYS(stat64), 1419 SCMP_SYS(time), 1420 SCMP_SYS(write), 1421 }; 1422 #endif 1423 { 1424 int i; 1425 1426 for (i = 0; i < COUNTOF(scmp_sc); i++) { 1427 if (seccomp_rule_add(ctx, 1428 SCMP_ACT_ALLOW, scmp_sc[i], 0) < 0) { 1429 msyslog(LOG_ERR, 1430 "%s: seccomp_rule_add() failed: %m", 1431 __func__); 1432 } 1433 } 1434 } 1435 1436 if (seccomp_load(ctx) < 0) 1437 msyslog(LOG_ERR, "%s: seccomp_load() failed: %m", 1438 __func__); 1439 else { 1440 msyslog(LOG_DEBUG, "%s: seccomp_load() succeeded", __func__); 1441 } 1442 #endif /* LIBSECCOMP and KERN_SECCOMP */ 1443 1444 ntservice_isup(); 1445 #if defined(HAVE_WORKING_FORK) 1446 if (daemon_pipe[1] != -1 && 0 == wait_sync) { 1447 if (2 != write(daemon_pipe[1], "R\n", 2)) { 1448 msyslog(LOG_ERR, "daemon failed to notify parent ntpd after init"); 1449 } 1450 close(daemon_pipe[1]); 1451 daemon_pipe[1] = -1; 1452 } 1453 #endif /* HAVE_WORKING_FORK */ 1454 1455 if (scan_addrs_once || no_periodic_scan) { 1456 endpt_scan_timer = 0; 1457 } 1458 1459 # ifndef HAVE_IO_COMPLETION_PORT 1460 BLOCK_IO_AND_ALARM(); 1461 was_alarmed = FALSE; 1462 # endif 1463 1464 for (;;) { 1465 #if !defined(SIM) && defined(SIGDIE1) 1466 if (signalled) 1467 finish_safe(signo); 1468 #endif 1469 # ifdef HAVE_IO_COMPLETION_PORT 1470 GetReceivedBuffers(); 1471 1472 # else /* normal I/O */ 1473 if (alarm_flag) { /* alarmed? */ 1474 was_alarmed = TRUE; 1475 alarm_flag = FALSE; 1476 } 1477 1478 /* collect async name/addr results */ 1479 if (!was_alarmed) 1480 harvest_blocking_responses(); 1481 1482 if (!was_alarmed && !has_full_recv_buffer()) { 1483 /* 1484 * Nothing to do. Wait for something. 1485 */ 1486 io_handler(); 1487 } 1488 1489 if (alarm_flag) { /* alarmed? */ 1490 was_alarmed = TRUE; 1491 alarm_flag = FALSE; 1492 } 1493 1494 if (was_alarmed) { 1495 UNBLOCK_IO_AND_ALARM(); 1496 /* 1497 * Out here, signals are unblocked. Call timer routine 1498 * to process expiry. 1499 */ 1500 timer(); 1501 was_alarmed = FALSE; 1502 BLOCK_IO_AND_ALARM(); 1503 } 1504 1505 # endif /* !HAVE_IO_COMPLETION_PORT */ 1506 1507 # ifdef DEBUG_TIMING 1508 { 1509 l_fp pts; 1510 l_fp tsa, tsb; 1511 int bufcount = 0; 1512 1513 get_systime(&pts); 1514 tsa = pts; 1515 # endif 1516 rbuf = get_full_recv_buffer(); 1517 while (rbuf != NULL) { 1518 if (alarm_flag) { 1519 was_alarmed = TRUE; 1520 alarm_flag = FALSE; 1521 } 1522 UNBLOCK_IO_AND_ALARM(); 1523 1524 if (was_alarmed) { 1525 /* avoid timer starvation during lengthy I/O handling */ 1526 timer(); 1527 was_alarmed = FALSE; 1528 } 1529 1530 /* 1531 * Call the data procedure to handle each received 1532 * packet. 1533 */ 1534 if (rbuf->receiver != NULL) { 1535 # ifdef DEBUG_TIMING 1536 l_fp dts = pts; 1537 1538 L_SUB(&dts, &rbuf->recv_time); 1539 DPRINTF(2, ("processing timestamp delta %s (with prec. fuzz)\n", lfptoa(&dts, 9))); 1540 collect_timing(rbuf, "buffer processing delay", 1, &dts); 1541 bufcount++; 1542 # endif 1543 (*rbuf->receiver)(rbuf); 1544 } else { 1545 msyslog(LOG_ERR, "fatal: receive buffer callback NULL"); 1546 abort(); 1547 } 1548 1549 BLOCK_IO_AND_ALARM(); 1550 freerecvbuf(rbuf); 1551 rbuf = get_full_recv_buffer(); 1552 } 1553 # ifdef DEBUG_TIMING 1554 get_systime(&tsb); 1555 L_SUB(&tsb, &tsa); 1556 if (bufcount) { 1557 collect_timing(NULL, "processing", bufcount, &tsb); 1558 DPRINTF(2, ("processing time for %d buffers %s\n", bufcount, lfptoa(&tsb, 9))); 1559 } 1560 } 1561 # endif 1562 1563 /* 1564 * Go around again 1565 */ 1566 1567 # ifdef HAVE_DNSREGISTRATION 1568 if (mdnsreg && (current_time - mdnsreg ) > 60 && mdnstries && sys_leap != LEAP_NOTINSYNC) { 1569 mdnsreg = current_time; 1570 msyslog(LOG_INFO, "Attempting to register mDNS"); 1571 if ( DNSServiceRegister (&mdns, 0, 0, NULL, "_ntp._udp", NULL, NULL, 1572 htons(NTP_PORT), 0, NULL, NULL, NULL) != kDNSServiceErr_NoError ) { 1573 if (!--mdnstries) { 1574 msyslog(LOG_ERR, "Unable to register mDNS, giving up."); 1575 } else { 1576 msyslog(LOG_INFO, "Unable to register mDNS, will try later."); 1577 } 1578 } else { 1579 msyslog(LOG_INFO, "mDNS service registered."); 1580 mdnsreg = FALSE; 1581 } 1582 } 1583 # endif /* HAVE_DNSREGISTRATION */ 1584 1585 } 1586 UNBLOCK_IO_AND_ALARM(); 1587 return 1; 1588 } 1589 #endif /* !SIM */ 1590 1591 1592 #if !defined(SIM) && defined(SIGDIE1) 1593 /* 1594 * finish - exit gracefully 1595 */ 1596 static void 1597 finish_safe( 1598 int sig 1599 ) 1600 { 1601 const char *sig_desc; 1602 1603 sig_desc = NULL; 1604 #ifdef HAVE_STRSIGNAL 1605 sig_desc = strsignal(sig); 1606 #endif 1607 if (sig_desc == NULL) 1608 sig_desc = ""; 1609 msyslog(LOG_NOTICE, "%s exiting on signal %d (%s)", progname, 1610 sig, sig_desc); 1611 /* See Bug 2513 and Bug 2522 re the unlink of PIDFILE */ 1612 # ifdef HAVE_DNSREGISTRATION 1613 if (mdns != NULL) 1614 DNSServiceRefDeallocate(mdns); 1615 # endif 1616 peer_cleanup(); 1617 exit(0); 1618 } 1619 1620 static RETSIGTYPE 1621 finish( 1622 int sig 1623 ) 1624 { 1625 signalled = 1; 1626 signo = sig; 1627 } 1628 1629 #endif /* !SIM && SIGDIE1 */ 1630 1631 1632 #ifndef SIM 1633 /* 1634 * wait_child_sync_if - implements parent side of -w/--wait-sync 1635 */ 1636 # ifdef HAVE_WORKING_FORK 1637 1638 static int 1639 wait_child_sync_if( 1640 int pipe_read_fd, 1641 unsigned long wait_sync 1642 ) 1643 { 1644 int rc; 1645 char ch; 1646 time_t wait_end_time; 1647 time_t cur_time; 1648 time_t wait_rem; 1649 fd_set readset; 1650 struct timeval wtimeout; 1651 1652 /* we wait a bit for the child in *any* case, because on failure 1653 * of the child we have to get and inspect the exit code! 1654 */ 1655 wait_end_time = time(NULL); 1656 if (wait_sync) 1657 wait_end_time += wait_sync; 1658 else 1659 wait_end_time += 30; 1660 1661 do { 1662 cur_time = time(NULL); 1663 wait_rem = (wait_end_time > cur_time) 1664 ? (wait_end_time - cur_time) 1665 : 0; 1666 wtimeout.tv_sec = wait_rem; 1667 wtimeout.tv_usec = 0; 1668 FD_ZERO(&readset); 1669 FD_SET(pipe_read_fd, &readset); 1670 rc = select(pipe_read_fd + 1, &readset, NULL, NULL, 1671 &wtimeout); 1672 if (-1 == rc) { 1673 if (EINTR == errno) 1674 continue; 1675 msyslog(LOG_ERR, 1676 "daemon startup: select failed: %m"); 1677 return EX_IOERR; 1678 } 1679 if (0 == rc) { 1680 /* 1681 * select() indicated a timeout, but in case 1682 * its timeouts are affected by a step of the 1683 * system clock, select() again with a zero 1684 * timeout to confirm. 1685 */ 1686 FD_ZERO(&readset); 1687 FD_SET(pipe_read_fd, &readset); 1688 wtimeout.tv_sec = 0; 1689 wtimeout.tv_usec = 0; 1690 rc = select(pipe_read_fd + 1, &readset, NULL, 1691 NULL, &wtimeout); 1692 if (0 == rc) /* select() timeout */ 1693 break; 1694 } 1695 rc = read(pipe_read_fd, &ch, 1); 1696 if (rc == 0) { 1697 /* DPRINTF is useless here as -d/-D disable forking */ 1698 fprintf(stderr, "daemon control: got EOF\n"); 1699 return -1; /* unexpected EOF, check daemon */ 1700 } else if (rc == 1) { 1701 if ( ('S' == ch && wait_sync > 0) 1702 || ('R' == ch && 0 == wait_sync)) { 1703 return 0; 1704 } 1705 } else { 1706 mfprintf(stderr, "%s: daemon control: read 1 char failed: %m\n", 1707 progname); 1708 msyslog(LOG_ERR, "daemon control: read 1 char failed: %m"); 1709 return EX_IOERR; 1710 } 1711 } while (wait_rem > 0); 1712 1713 if (wait_sync > 0) { 1714 fprintf(stderr, "%s: -w/--wait-sync %ld timed out.\n", 1715 progname, wait_sync); 1716 msyslog(LOG_ERR, "-w/--wait-sync %ld timed out.", wait_sync); 1717 return EX_PROTOCOL; 1718 } else { 1719 fprintf(stderr, "%s: daemon startup monitoring timed out.\n", 1720 progname); 1721 msyslog(LOG_ERR, "daemon startup monitoring timed out."); 1722 return 0; 1723 } 1724 } 1725 1726 1727 static int 1728 wait_child_exit_if( 1729 pid_t cpid, 1730 int blocking 1731 ) 1732 { 1733 # ifdef HAVE_WAITPID 1734 int rc = 0; 1735 int wstatus; 1736 if (cpid == waitpid(cpid, &wstatus, (blocking ? 0 : WNOHANG))) { 1737 if (WIFEXITED(wstatus)) { 1738 rc = WEXITSTATUS(wstatus); 1739 msyslog(LOG_ERR, "daemon child exited with code %d", 1740 rc); 1741 } else if (WIFSIGNALED(wstatus)) { 1742 rc = EX_SOFTWARE; 1743 msyslog(LOG_ERR, "daemon child died with signal %d", 1744 WTERMSIG(wstatus)); 1745 } else { 1746 rc = EX_SOFTWARE; 1747 msyslog(LOG_ERR, "daemon child died with unknown cause"); 1748 } 1749 } 1750 return rc; 1751 # else 1752 UNUSED_ARG(cpid); 1753 return 0; 1754 # endif 1755 } 1756 1757 # endif /* HAVE_WORKING_FORK */ 1758 1759 1760 /* 1761 * assertion_failed - Redirect assertion failures to msyslog(). 1762 */ 1763 static void 1764 assertion_failed( 1765 const char *file, 1766 int line, 1767 isc_assertiontype_t type, 1768 const char *cond 1769 ) 1770 { 1771 isc_assertion_setcallback(NULL); /* Avoid recursion */ 1772 1773 msyslog(LOG_ERR, "%s:%d: %s(%s) failed", 1774 file, line, isc_assertion_typetotext(type), cond); 1775 msyslog(LOG_ERR, "exiting (due to assertion failure)"); 1776 1777 #if defined(DEBUG) && defined(SYS_WINNT) 1778 if (debug) 1779 DebugBreak(); 1780 #endif 1781 1782 abort(); 1783 } 1784 1785 1786 /* 1787 * library_fatal_error - Handle fatal errors from our libraries. 1788 */ 1789 static void 1790 library_fatal_error( 1791 const char *file, 1792 int line, 1793 const char *format, 1794 va_list args 1795 ) 1796 { 1797 char errbuf[256]; 1798 1799 isc_error_setfatal(NULL); /* Avoid recursion */ 1800 1801 msyslog(LOG_ERR, "%s:%d: fatal error:", file, line); 1802 vsnprintf(errbuf, sizeof(errbuf), format, args); 1803 msyslog(LOG_ERR, "%s", errbuf); 1804 msyslog(LOG_ERR, "exiting (due to fatal error in library)"); 1805 1806 #if defined(DEBUG) && defined(SYS_WINNT) 1807 if (debug) 1808 DebugBreak(); 1809 #endif 1810 1811 abort(); 1812 } 1813 1814 1815 /* 1816 * library_unexpected_error - Handle non fatal errors from our libraries. 1817 */ 1818 # define MAX_UNEXPECTED_ERRORS 100 1819 int unexpected_error_cnt = 0; 1820 static void 1821 library_unexpected_error( 1822 const char *file, 1823 int line, 1824 const char *format, 1825 va_list args 1826 ) 1827 { 1828 char errbuf[256]; 1829 1830 if (unexpected_error_cnt >= MAX_UNEXPECTED_ERRORS) 1831 return; /* avoid clutter in log */ 1832 1833 msyslog(LOG_ERR, "%s:%d: unexpected error:", file, line); 1834 vsnprintf(errbuf, sizeof(errbuf), format, args); 1835 msyslog(LOG_ERR, "%s", errbuf); 1836 1837 if (++unexpected_error_cnt == MAX_UNEXPECTED_ERRORS) 1838 msyslog(LOG_ERR, "Too many errors. Shutting up."); 1839 1840 } 1841 #endif /* !SIM */ 1842 1843 #if !defined(SIM) && !defined(SYS_WINNT) 1844 # ifdef DEBUG 1845 1846 /* 1847 * moredebug - increase debugging verbosity 1848 */ 1849 static RETSIGTYPE 1850 moredebug( 1851 int sig 1852 ) 1853 { 1854 int saved_errno = errno; 1855 1856 if (debug < 255) 1857 { 1858 debug++; 1859 msyslog(LOG_DEBUG, "debug raised to %d", debug); 1860 } 1861 errno = saved_errno; 1862 } 1863 1864 1865 /* 1866 * lessdebug - decrease debugging verbosity 1867 */ 1868 static RETSIGTYPE 1869 lessdebug( 1870 int sig 1871 ) 1872 { 1873 int saved_errno = errno; 1874 1875 if (debug > 0) 1876 { 1877 debug--; 1878 msyslog(LOG_DEBUG, "debug lowered to %d", debug); 1879 } 1880 errno = saved_errno; 1881 } 1882 1883 # else /* !DEBUG follows */ 1884 1885 1886 /* 1887 * no_debug - We don't do the debug here. 1888 */ 1889 static RETSIGTYPE 1890 no_debug( 1891 int sig 1892 ) 1893 { 1894 int saved_errno = errno; 1895 1896 msyslog(LOG_DEBUG, "ntpd not compiled for debugging (signal %d)", sig); 1897 errno = saved_errno; 1898 } 1899 # endif /* !DEBUG */ 1900 #endif /* !SIM && !SYS_WINNT */ 1901
Indexes created Sun Aug 09 00:24:28 UTC 2026