| File: | src/sbin/isakmpd/isakmpd.c |
| Warning: | line 221, column 2 Value stored to 'argv' is never read |
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| 1 | /* $OpenBSD: isakmpd.c,v 1.107 2018/01/15 09:54:48 mpi Exp $ */ |
| 2 | /* $EOM: isakmpd.c,v 1.54 2000/10/05 09:28:22 niklas Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1998, 1999, 2000, 2001 Niklas Hallqvist. All rights reserved. |
| 6 | * Copyright (c) 1999, 2000 Angelos D. Keromytis. All rights reserved. |
| 7 | * Copyright (c) 1999, 2000, 2001 Håkan Olsson. All rights reserved. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * 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 | /* |
| 31 | * This code was written under funding by Ericsson Radio Systems. |
| 32 | */ |
| 33 | |
| 34 | #include <errno(*__errno()).h> |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/stat.h> |
| 37 | #include <signal.h> |
| 38 | #include <stdio.h> |
| 39 | #include <stdlib.h> |
| 40 | #include <string.h> |
| 41 | #include <time.h> |
| 42 | #include <netdb.h> |
| 43 | #include <unistd.h> |
| 44 | #include <fcntl.h> |
| 45 | #include <paths.h> |
| 46 | |
| 47 | #include "app.h" |
| 48 | #include "conf.h" |
| 49 | #include "connection.h" |
| 50 | #include "init.h" |
| 51 | #include "libcrypto.h" |
| 52 | #include "log.h" |
| 53 | #include "message.h" |
| 54 | #include "monitor.h" |
| 55 | #include "nat_traversal.h" |
| 56 | #include "sa.h" |
| 57 | #include "timer.h" |
| 58 | #include "transport.h" |
| 59 | #include "udp.h" |
| 60 | #include "udp_encap.h" |
| 61 | #include "ui.h" |
| 62 | #include "util.h" |
| 63 | #include "cert.h" |
| 64 | |
| 65 | #include "policy.h" |
| 66 | |
| 67 | static void usage(void); |
| 68 | |
| 69 | /* |
| 70 | * Set if -d is given, currently just for running in the foreground and log |
| 71 | * to stderr instead of syslog. |
| 72 | */ |
| 73 | int debug = 0; |
| 74 | |
| 75 | /* Set when no policy file shall be used. */ |
| 76 | int acquire_only = 0; |
| 77 | |
| 78 | /* Set when SAs shall be deleted on shutdown. */ |
| 79 | int delete_sas = 1; |
| 80 | |
| 81 | /* |
| 82 | * If we receive a SIGHUP signal, this flag gets set to show we need to |
| 83 | * reconfigure ASAP. |
| 84 | */ |
| 85 | volatile sig_atomic_t sighupped = 0; |
| 86 | |
| 87 | /* |
| 88 | * If we receive a USR1 signal, this flag gets set to show we need to dump |
| 89 | * a report over our internal state ASAP. The file to report to is settable |
| 90 | * via the -R parameter. |
| 91 | */ |
| 92 | volatile sig_atomic_t sigusr1ed = 0; |
| 93 | static char *report_file = "/var/run/isakmpd.report"; |
| 94 | |
| 95 | /* |
| 96 | * If we receive a TERM signal, perform a "clean shutdown" of the daemon. |
| 97 | * This includes to send DELETE notifications for all our active SAs. |
| 98 | * Also on recv of an INT signal (Ctrl-C out of an '-d' session, typically). |
| 99 | */ |
| 100 | volatile sig_atomic_t sigtermed = 0; |
| 101 | void daemon_shutdown_now(int); |
| 102 | void set_slave_signals(void); |
| 103 | void sanitise_stdfd(void); |
| 104 | |
| 105 | /* The default path of the PID file. */ |
| 106 | char *pid_file = "/var/run/isakmpd.pid"; |
| 107 | |
| 108 | /* The path of the IKE packet capture log file. */ |
| 109 | static char *pcap_file = 0; |
| 110 | |
| 111 | static void |
| 112 | usage(void) |
| 113 | { |
| 114 | extern char *__progname; |
| 115 | |
| 116 | fprintf(stderr(&__sF[2]), |
| 117 | "usage: %s [-46adKLnSTv] [-c config-file] [-D class=level] [-f fifo]\n" |
| 118 | " [-i pid-file] [-l packetlog-file] [-N udpencap-port]\n" |
| 119 | " [-p listen-port] [-R report-file]\n", |
| 120 | __progname); |
| 121 | exit(1); |
| 122 | } |
| 123 | |
| 124 | static void |
| 125 | parse_args(int argc, char *argv[]) |
| 126 | { |
| 127 | int ch; |
| 128 | int cls, level; |
| 129 | int do_packetlog = 0; |
| 130 | |
| 131 | while ((ch = getopt(argc, argv, "46ac:dD:f:i:KnN:p:Ll:R:STv")) != -1) { |
| 132 | switch (ch) { |
| 133 | case '4': |
| 134 | bind_family |= BIND_FAMILY_INET40x0001; |
| 135 | break; |
| 136 | |
| 137 | case '6': |
| 138 | bind_family |= BIND_FAMILY_INET60x0002; |
| 139 | break; |
| 140 | |
| 141 | case 'a': |
| 142 | acquire_only = 1; |
| 143 | break; |
| 144 | |
| 145 | case 'c': |
| 146 | conf_path = optarg; |
| 147 | break; |
| 148 | |
| 149 | case 'd': |
| 150 | debug++; |
| 151 | break; |
| 152 | |
| 153 | case 'D': |
| 154 | if (sscanf(optarg, "%d=%d", &cls, &level) != 2) { |
| 155 | if (sscanf(optarg, "A=%d", &level) == 1) { |
| 156 | for (cls = 0; cls < LOG_ENDCLASS; |
| 157 | cls++) |
| 158 | log_debug_cmd(cls, level); |
| 159 | } else |
| 160 | log_print("parse_args: -D argument " |
| 161 | "unparseable: %s", optarg); |
| 162 | } else |
| 163 | log_debug_cmd(cls, level); |
| 164 | break; |
| 165 | |
| 166 | case 'f': |
| 167 | ui_fifo = optarg; |
| 168 | break; |
| 169 | |
| 170 | case 'i': |
| 171 | pid_file = optarg; |
| 172 | break; |
| 173 | |
| 174 | case 'K': |
| 175 | ignore_policy++; |
| 176 | break; |
| 177 | |
| 178 | case 'n': |
| 179 | app_none++; |
| 180 | break; |
| 181 | |
| 182 | case 'N': |
| 183 | udp_encap_default_port = optarg; |
| 184 | break; |
| 185 | |
| 186 | case 'p': |
| 187 | udp_default_port = optarg; |
| 188 | break; |
| 189 | |
| 190 | case 'l': |
| 191 | pcap_file = optarg; |
| 192 | /* FALLTHROUGH */ |
| 193 | |
| 194 | case 'L': |
| 195 | do_packetlog++; |
| 196 | break; |
| 197 | |
| 198 | case 'R': |
| 199 | report_file = optarg; |
| 200 | break; |
| 201 | |
| 202 | case 'S': |
| 203 | delete_sas = 0; |
| 204 | ui_daemon_passive = 1; |
| 205 | break; |
| 206 | |
| 207 | case 'T': |
| 208 | disable_nat_t = 1; |
| 209 | break; |
| 210 | |
| 211 | case 'v': |
| 212 | verbose_logging = 1; |
| 213 | break; |
| 214 | |
| 215 | case '?': |
| 216 | default: |
| 217 | usage(); |
| 218 | } |
| 219 | } |
| 220 | argc -= optind; |
| 221 | argv += optind; |
Value stored to 'argv' is never read | |
| 222 | |
| 223 | if (argc > 0) |
| 224 | usage(); |
| 225 | |
| 226 | if (do_packetlog && !pcap_file) |
| 227 | pcap_file = PCAP_FILE_DEFAULT"/var/run/isakmpd.pcap"; |
| 228 | } |
| 229 | |
| 230 | /* ARGSUSED */ |
| 231 | static void |
| 232 | sighup(int sig) |
| 233 | { |
| 234 | sighupped = 1; |
| 235 | } |
| 236 | |
| 237 | /* Report internal state on SIGUSR1. */ |
| 238 | static void |
| 239 | report(void) |
| 240 | { |
| 241 | FILE *rfp, *old; |
| 242 | mode_t old_umask; |
| 243 | |
| 244 | old_umask = umask(S_IRWXG0000070 | S_IRWXO0000007); |
| 245 | rfp = monitor_fopen(report_file, "w"); |
| 246 | umask(old_umask); |
| 247 | |
| 248 | if (!rfp) { |
| 249 | log_error("report: fopen (\"%s\", \"w\") failed", report_file); |
| 250 | return; |
| 251 | } |
| 252 | /* Divert the log channel to the report file during the report. */ |
| 253 | old = log_current(); |
| 254 | log_to(rfp); |
| 255 | ui_report("r"); |
| 256 | log_to(old); |
| 257 | fclose(rfp); |
| 258 | } |
| 259 | |
| 260 | static void |
| 261 | sigusr1(int sig) |
| 262 | { |
| 263 | sigusr1ed = 1; |
| 264 | } |
| 265 | |
| 266 | static int |
| 267 | phase2_sa_check(struct sa *sa, void *arg) |
| 268 | { |
| 269 | return sa->phase == 2; |
| 270 | } |
| 271 | |
| 272 | static int |
| 273 | phase1_sa_check(struct sa *sa, void *arg) |
| 274 | { |
| 275 | return sa->phase == 1; |
| 276 | } |
| 277 | |
| 278 | void |
| 279 | set_slave_signals(void) |
| 280 | { |
| 281 | int n; |
| 282 | |
| 283 | for (n = 1; n < _NSIG33; n++) |
| 284 | signal(n, SIG_DFL(void (*)(int))0); |
| 285 | |
| 286 | /* |
| 287 | * Do a clean daemon shutdown on TERM/INT. These signals must be |
| 288 | * initialized before monitor_init(). INT is only used with '-d'. |
| 289 | */ |
| 290 | signal(SIGTERM15, daemon_shutdown_now); |
| 291 | if (debug == 1) /* i.e '-dd' will skip this. */ |
| 292 | signal(SIGINT2, daemon_shutdown_now); |
| 293 | |
| 294 | /* Reinitialize on HUP reception. */ |
| 295 | signal(SIGHUP1, sighup); |
| 296 | |
| 297 | /* Report state on USR1 reception. */ |
| 298 | signal(SIGUSR130, sigusr1); |
| 299 | } |
| 300 | |
| 301 | static void |
| 302 | daemon_shutdown(void) |
| 303 | { |
| 304 | /* Perform a (protocol-wise) clean shutdown of the daemon. */ |
| 305 | struct sa *sa; |
| 306 | |
| 307 | if (sigtermed == 1) { |
| 308 | log_print("isakmpd: shutting down..."); |
| 309 | |
| 310 | if (delete_sas && |
| 311 | strncmp("no", conf_get_str("General", "Delete-SAs"), 2)) { |
| 312 | /* |
| 313 | * Delete all active SAs. First IPsec SAs, then |
| 314 | * ISAKMPD. Each DELETE is another (outgoing) message. |
| 315 | */ |
| 316 | while ((sa = sa_find(phase2_sa_check, NULL((void*)0)))) |
| 317 | sa_delete(sa, 1); |
| 318 | |
| 319 | while ((sa = sa_find(phase1_sa_check, NULL((void*)0)))) |
| 320 | sa_delete(sa, 1); |
| 321 | } |
| 322 | |
| 323 | /* We only want to do this once. */ |
| 324 | sigtermed++; |
| 325 | } |
| 326 | if (transport_prio_sendqs_empty()) { |
| 327 | /* |
| 328 | * When the prioritized transport sendq:s are empty, i.e all |
| 329 | * the DELETE notifications have been sent, we can shutdown. |
| 330 | */ |
| 331 | |
| 332 | log_packet_stop(); |
| 333 | log_print("isakmpd: exit"); |
| 334 | exit(0); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | /* Called on SIGTERM, SIGINT or by ui_shutdown_daemon(). */ |
| 339 | /* ARGSUSED */ |
| 340 | void |
| 341 | daemon_shutdown_now(int sig) |
| 342 | { |
| 343 | sigtermed = 1; |
| 344 | } |
| 345 | |
| 346 | /* Write pid file. */ |
| 347 | static void |
| 348 | write_pid_file(void) |
| 349 | { |
| 350 | FILE *fp; |
| 351 | |
| 352 | unlink(pid_file); |
| 353 | |
| 354 | fp = fopen(pid_file, "w"); |
| 355 | if (fp != NULL((void*)0)) { |
| 356 | if (fprintf(fp, "%ld\n", (long) getpid()) < 0) |
| 357 | log_error("write_pid_file: failed to write PID to " |
| 358 | "\"%.100s\"", pid_file); |
| 359 | fclose(fp); |
| 360 | } else |
| 361 | log_fatal("write_pid_file: fopen (\"%.100s\", \"w\") failed", |
| 362 | pid_file); |
| 363 | } |
| 364 | |
| 365 | void |
| 366 | sanitise_stdfd(void) |
| 367 | { |
| 368 | int nullfd, dupfd; |
| 369 | |
| 370 | if ((nullfd = dupfd = open(_PATH_DEVNULL"/dev/null", O_RDWR0x0002)) == -1) { |
| 371 | fprintf(stderr(&__sF[2]), "Couldn't open /dev/null: %s\n", |
| 372 | strerror(errno(*__errno()))); |
| 373 | exit(1); |
| 374 | } |
| 375 | while (++dupfd <= STDERR_FILENO2) { |
| 376 | /* Only populate closed fds */ |
| 377 | if (fcntl(dupfd, F_GETFL3) == -1 && errno(*__errno()) == EBADF9) { |
| 378 | if (dup2(nullfd, dupfd) == -1) { |
| 379 | fprintf(stderr(&__sF[2]), "dup2: %s\n", strerror(errno(*__errno()))); |
| 380 | exit(1); |
| 381 | } |
| 382 | } |
| 383 | } |
| 384 | if (nullfd > STDERR_FILENO2) |
| 385 | close(nullfd); |
| 386 | } |
| 387 | |
| 388 | int |
| 389 | main(int argc, char *argv[]) |
| 390 | { |
| 391 | fd_set *rfds, *wfds; |
| 392 | int n, m; |
| 393 | size_t mask_size; |
| 394 | struct timespec ts, *timeout; |
| 395 | |
| 396 | closefrom(STDERR_FILENO2 + 1); |
| 397 | |
| 398 | /* |
| 399 | * Make sure init() won't alloc fd 0, 1 or 2, as daemon() will close |
| 400 | * them. |
| 401 | */ |
| 402 | sanitise_stdfd(); |
| 403 | |
| 404 | /* Log cmd line parsing and initialization errors to stderr. */ |
| 405 | log_to(stderr(&__sF[2])); |
| 406 | parse_args(argc, argv); |
| 407 | log_init(debug); |
| 408 | log_print("isakmpd: starting"); |
| 409 | |
| 410 | /* Open protocols and services databases. */ |
| 411 | setprotoent(1); |
| 412 | setservent(1); |
| 413 | |
| 414 | /* Open command fifo */ |
| 415 | ui_init(); |
| 416 | |
| 417 | set_slave_signals(); |
| 418 | /* Daemonize before forking unpriv'ed child */ |
| 419 | if (!debug) |
| 420 | if (daemon(0, 0)) |
| 421 | log_fatal("main: daemon (0, 0) failed"); |
| 422 | |
| 423 | /* Set timezone before priv'separation */ |
| 424 | tzset(); |
| 425 | |
| 426 | write_pid_file(); |
| 427 | |
| 428 | if (monitor_init(debug)) { |
| 429 | /* The parent, with privileges enters infinite monitor loop. */ |
| 430 | monitor_loop(debug); |
| 431 | exit(0); /* Never reached. */ |
| 432 | } |
| 433 | /* Child process only from this point on, no privileges left. */ |
| 434 | |
| 435 | init(); |
| 436 | |
| 437 | /* If we wanted IKE packet capture to file, initialize it now. */ |
| 438 | if (pcap_file != 0) |
| 439 | log_packet_init(pcap_file); |
| 440 | |
| 441 | /* Allocate the file descriptor sets just big enough. */ |
| 442 | n = getdtablesize(); |
| 443 | mask_size = howmany(n, NFDBITS)(((n) + ((((unsigned)(sizeof(__fd_mask) * 8))) - 1)) / (((unsigned )(sizeof(__fd_mask) * 8)))) * sizeof(fd_mask__fd_mask); |
| 444 | rfds = malloc(mask_size); |
| 445 | if (!rfds) |
| 446 | log_fatal("main: malloc (%lu) failed", |
| 447 | (unsigned long)mask_size); |
| 448 | wfds = malloc(mask_size); |
| 449 | if (!wfds) |
| 450 | log_fatal("main: malloc (%lu) failed", |
| 451 | (unsigned long)mask_size); |
| 452 | |
| 453 | monitor_init_done(); |
| 454 | |
| 455 | while (1) { |
| 456 | /* If someone has sent SIGHUP to us, reconfigure. */ |
| 457 | if (sighupped) { |
| 458 | sighupped = 0; |
| 459 | log_print("SIGHUP received"); |
| 460 | reinit(); |
| 461 | } |
| 462 | /* and if someone sent SIGUSR1, do a state report. */ |
| 463 | if (sigusr1ed) { |
| 464 | sigusr1ed = 0; |
| 465 | log_print("SIGUSR1 received"); |
| 466 | report(); |
| 467 | } |
| 468 | /* |
| 469 | * and if someone set 'sigtermed' (SIGTERM, SIGINT or via the |
| 470 | * UI), this indicates we should start a controlled shutdown |
| 471 | * of the daemon. |
| 472 | * |
| 473 | * Note: Since _one_ message is sent per iteration of this |
| 474 | * enclosing while-loop, and we want to send a number of |
| 475 | * DELETE notifications, we must loop atleast this number of |
| 476 | * times. The daemon_shutdown() function starts by queueing |
| 477 | * the DELETEs, all other calls just increments the |
| 478 | * 'sigtermed' variable until it reaches a "safe" value, and |
| 479 | * the daemon exits. |
| 480 | */ |
| 481 | if (sigtermed) |
| 482 | daemon_shutdown(); |
| 483 | |
| 484 | /* Setup the descriptors to look for incoming messages at. */ |
| 485 | bzero(rfds, mask_size); |
| 486 | n = transport_fd_set(rfds); |
| 487 | FD_SET(ui_socket, rfds)__fd_set((ui_socket), (rfds)); |
| 488 | if (ui_socket + 1 > n) |
| 489 | n = ui_socket + 1; |
| 490 | |
| 491 | /* |
| 492 | * XXX Some day we might want to deal with an abstract |
| 493 | * application class instead, with many instantiations |
| 494 | * possible. |
| 495 | */ |
| 496 | if (!app_none && app_socket >= 0) { |
| 497 | FD_SET(app_socket, rfds)__fd_set((app_socket), (rfds)); |
| 498 | if (app_socket + 1 > n) |
| 499 | n = app_socket + 1; |
| 500 | } |
| 501 | /* Setup the descriptors that have pending messages to send. */ |
| 502 | bzero(wfds, mask_size); |
| 503 | m = transport_pending_wfd_set(wfds); |
| 504 | if (m > n) |
| 505 | n = m; |
| 506 | |
| 507 | /* Find out when the next timed event is. */ |
| 508 | timeout = &ts; |
| 509 | timer_next_event(&timeout); |
| 510 | |
| 511 | n = pselect(n, rfds, wfds, NULL((void*)0), timeout, NULL((void*)0)); |
| 512 | if (n == -1) { |
| 513 | if (errno(*__errno()) != EINTR4) { |
| 514 | log_error("main: select"); |
| 515 | |
| 516 | /* |
| 517 | * In order to give the unexpected error |
| 518 | * condition time to resolve without letting |
| 519 | * this process eat up all available CPU |
| 520 | * we sleep for a short while. |
| 521 | */ |
| 522 | sleep(1); |
| 523 | } |
| 524 | } else if (n) { |
| 525 | transport_handle_messages(rfds); |
| 526 | transport_send_messages(wfds); |
| 527 | if (FD_ISSET(ui_socket, rfds)__fd_isset((ui_socket), (rfds))) |
| 528 | ui_handler(); |
| 529 | if (!app_none && app_socket >= 0 && |
| 530 | FD_ISSET(app_socket, rfds)__fd_isset((app_socket), (rfds))) |
| 531 | app_handler(); |
| 532 | } |
| 533 | timer_handle_expirations(); |
| 534 | } |
| 535 | } |