1 /* $OpenBSD: misc.c,v 1.185 2023/08/04 06:32:40 dtucker Exp $ */ 2 /* 3 * Copyright (c) 2000 Markus Friedl. All rights reserved. 4 * Copyright (c) 2005-2020 Damien Miller. All rights reserved. 5 * Copyright (c) 2004 Henning Brauer <henning@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 21 #include "includes.h" 22 23 #include <sys/types.h> 24 #include <sys/ioctl.h> 25 #include <sys/mman.h> 26 #include <sys/socket.h> 27 #include <sys/stat.h> 28 #include <sys/time.h> 29 #include <sys/wait.h> 30 #include <sys/un.h> 31 32 #include <limits.h> 33 #ifdef HAVE_LIBGEN_H 34 # include <libgen.h> 35 #endif 36 #ifdef HAVE_POLL_H 37 #include <poll.h> 38 #endif 39 #ifdef HAVE_NLIST_H 40 #include <nlist.h> 41 #endif 42 #include <signal.h> 43 #include <stdarg.h> 44 #include <stdio.h> 45 #ifdef HAVE_STDINT_H 46 # include <stdint.h> 47 #endif 48 #include <stdlib.h> 49 #include <string.h> 50 #include <time.h> 51 #include <unistd.h> 52 53 #include <netinet/in.h> 54 #include <netinet/in_systm.h> 55 #include <netinet/ip.h> 56 #include <netinet/tcp.h> 57 #include <arpa/inet.h> 58 59 #include <ctype.h> 60 #include <errno.h> 61 #include <fcntl.h> 62 #include <netdb.h> 63 #ifdef HAVE_PATHS_H 64 # include <paths.h> 65 #include <pwd.h> 66 #include <grp.h> 67 #endif 68 #ifdef SSH_TUN_OPENBSD 69 #include <net/if.h> 70 #endif 71 72 #include "xmalloc.h" 73 #include "misc.h" 74 #include "log.h" 75 #include "ssh.h" 76 #include "sshbuf.h" 77 #include "ssherr.h" 78 #include "platform.h" 79 80 /* remove newline at end of string */ 81 char * 82 chop(char *s) 83 { 84 char *t = s; 85 while (*t) { 86 if (*t == '\n' || *t == '\r') { 87 *t = '\0'; 88 return s; 89 } 90 t++; 91 } 92 return s; 93 94 } 95 96 /* remove whitespace from end of string */ 97 void 98 rtrim(char *s) 99 { 100 size_t i; 101 102 if ((i = strlen(s)) == 0) 103 return; 104 for (i--; i > 0; i--) { 105 if (isspace((unsigned char)s[i])) 106 s[i] = '\0'; 107 } 108 } 109 110 /* set/unset filedescriptor to non-blocking */ 111 int 112 set_nonblock(int fd) 113 { 114 int val; 115 116 val = fcntl(fd, F_GETFL); 117 if (val == -1) { 118 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 119 return (-1); 120 } 121 if (val & O_NONBLOCK) { 122 debug3("fd %d is O_NONBLOCK", fd); 123 return (0); 124 } 125 debug2("fd %d setting O_NONBLOCK", fd); 126 val |= O_NONBLOCK; 127 if (fcntl(fd, F_SETFL, val) == -1) { 128 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, 129 strerror(errno)); 130 return (-1); 131 } 132 return (0); 133 } 134 135 int 136 unset_nonblock(int fd) 137 { 138 int val; 139 140 val = fcntl(fd, F_GETFL); 141 if (val == -1) { 142 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 143 return (-1); 144 } 145 if (!(val & O_NONBLOCK)) { 146 debug3("fd %d is not O_NONBLOCK", fd); 147 return (0); 148 } 149 debug("fd %d clearing O_NONBLOCK", fd); 150 val &= ~O_NONBLOCK; 151 if (fcntl(fd, F_SETFL, val) == -1) { 152 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", 153 fd, strerror(errno)); 154 return (-1); 155 } 156 return (0); 157 } 158 159 const char * 160 ssh_gai_strerror(int gaierr) 161 { 162 if (gaierr == EAI_SYSTEM && errno != 0) 163 return strerror(errno); 164 return gai_strerror(gaierr); 165 } 166 167 /* disable nagle on socket */ 168 void 169 set_nodelay(int fd) 170 { 171 int opt; 172 socklen_t optlen; 173 174 optlen = sizeof opt; 175 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { 176 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); 177 return; 178 } 179 if (opt == 1) { 180 debug2("fd %d is TCP_NODELAY", fd); 181 return; 182 } 183 opt = 1; 184 debug2("fd %d setting TCP_NODELAY", fd); 185 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) 186 error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); 187 } 188 189 /* Allow local port reuse in TIME_WAIT */ 190 int 191 set_reuseaddr(int fd) 192 { 193 int on = 1; 194 195 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) { 196 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); 197 return -1; 198 } 199 return 0; 200 } 201 202 /* Get/set routing domain */ 203 char * 204 get_rdomain(int fd) 205 { 206 #if defined(HAVE_SYS_GET_RDOMAIN) 207 return sys_get_rdomain(fd); 208 #elif defined(__OpenBSD__) 209 int rtable; 210 char *ret; 211 socklen_t len = sizeof(rtable); 212 213 if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) { 214 error("Failed to get routing domain for fd %d: %s", 215 fd, strerror(errno)); 216 return NULL; 217 } 218 xasprintf(&ret, "%d", rtable); 219 return ret; 220 #else /* defined(__OpenBSD__) */ 221 return NULL; 222 #endif 223 } 224 225 int 226 set_rdomain(int fd, const char *name) 227 { 228 #if defined(HAVE_SYS_SET_RDOMAIN) 229 return sys_set_rdomain(fd, name); 230 #elif defined(__OpenBSD__) 231 int rtable; 232 const char *errstr; 233 234 if (name == NULL) 235 return 0; /* default table */ 236 237 rtable = (int)strtonum(name, 0, 255, &errstr); 238 if (errstr != NULL) { 239 /* Shouldn't happen */ 240 error("Invalid routing domain \"%s\": %s", name, errstr); 241 return -1; 242 } 243 if (setsockopt(fd, SOL_SOCKET, SO_RTABLE, 244 &rtable, sizeof(rtable)) == -1) { 245 error("Failed to set routing domain %d on fd %d: %s", 246 rtable, fd, strerror(errno)); 247 return -1; 248 } 249 return 0; 250 #else /* defined(__OpenBSD__) */ 251 error("Setting routing domain is not supported on this platform"); 252 return -1; 253 #endif 254 } 255 256 int 257 get_sock_af(int fd) 258 { 259 struct sockaddr_storage to; 260 socklen_t tolen = sizeof(to); 261 262 memset(&to, 0, sizeof(to)); 263 if (getsockname(fd, (struct sockaddr *)&to, &tolen) == -1) 264 return -1; 265 #ifdef IPV4_IN_IPV6 266 if (to.ss_family == AF_INET6 && 267 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&to)->sin6_addr)) 268 return AF_INET; 269 #endif 270 return to.ss_family; 271 } 272 273 void 274 set_sock_tos(int fd, int tos) 275 { 276 #ifndef IP_TOS_IS_BROKEN 277 int af; 278 279 switch ((af = get_sock_af(fd))) { 280 case -1: 281 /* assume not a socket */ 282 break; 283 case AF_INET: 284 # ifdef IP_TOS 285 debug3_f("set socket %d IP_TOS 0x%02x", fd, tos); 286 if (setsockopt(fd, IPPROTO_IP, IP_TOS, 287 &tos, sizeof(tos)) == -1) { 288 error("setsockopt socket %d IP_TOS %d: %s", 289 fd, tos, strerror(errno)); 290 } 291 # endif /* IP_TOS */ 292 break; 293 case AF_INET6: 294 # ifdef IPV6_TCLASS 295 debug3_f("set socket %d IPV6_TCLASS 0x%02x", fd, tos); 296 if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, 297 &tos, sizeof(tos)) == -1) { 298 error("setsockopt socket %d IPV6_TCLASS %d: %s", 299 fd, tos, strerror(errno)); 300 } 301 # endif /* IPV6_TCLASS */ 302 break; 303 default: 304 debug2_f("unsupported socket family %d", af); 305 break; 306 } 307 #endif /* IP_TOS_IS_BROKEN */ 308 } 309 310 /* 311 * Wait up to *timeoutp milliseconds for events on fd. Updates 312 * *timeoutp with time remaining. 313 * Returns 0 if fd ready or -1 on timeout or error (see errno). 314 */ 315 static int 316 waitfd(int fd, int *timeoutp, short events) 317 { 318 struct pollfd pfd; 319 struct timeval t_start; 320 int oerrno, r, have_timeout = (*timeoutp >= 0); 321 322 pfd.fd = fd; 323 pfd.events = events; 324 for (; !have_timeout || *timeoutp >= 0;) { 325 monotime_tv(&t_start); 326 r = poll(&pfd, 1, *timeoutp); 327 oerrno = errno; 328 if (have_timeout) 329 ms_subtract_diff(&t_start, timeoutp); 330 errno = oerrno; 331 if (r > 0) 332 return 0; 333 else if (r == -1 && errno != EAGAIN && errno != EINTR) 334 return -1; 335 else if (r == 0) 336 break; 337 } 338 /* timeout */ 339 errno = ETIMEDOUT; 340 return -1; 341 } 342 343 /* 344 * Wait up to *timeoutp milliseconds for fd to be readable. Updates 345 * *timeoutp with time remaining. 346 * Returns 0 if fd ready or -1 on timeout or error (see errno). 347 */ 348 int 349 waitrfd(int fd, int *timeoutp) { 350 return waitfd(fd, timeoutp, POLLIN); 351 } 352 353 /* 354 * Attempt a non-blocking connect(2) to the specified address, waiting up to 355 * *timeoutp milliseconds for the connection to complete. If the timeout is 356 * <=0, then wait indefinitely. 357 * 358 * Returns 0 on success or -1 on failure. 359 */ 360 int 361 timeout_connect(int sockfd, const struct sockaddr *serv_addr, 362 socklen_t addrlen, int *timeoutp) 363 { 364 int optval = 0; 365 socklen_t optlen = sizeof(optval); 366 367 /* No timeout: just do a blocking connect() */ 368 if (timeoutp == NULL || *timeoutp <= 0) 369 return connect(sockfd, serv_addr, addrlen); 370 371 set_nonblock(sockfd); 372 for (;;) { 373 if (connect(sockfd, serv_addr, addrlen) == 0) { 374 /* Succeeded already? */ 375 unset_nonblock(sockfd); 376 return 0; 377 } else if (errno == EINTR) 378 continue; 379 else if (errno != EINPROGRESS) 380 return -1; 381 break; 382 } 383 384 if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT) == -1) 385 return -1; 386 387 /* Completed or failed */ 388 if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) { 389 debug("getsockopt: %s", strerror(errno)); 390 return -1; 391 } 392 if (optval != 0) { 393 errno = optval; 394 return -1; 395 } 396 unset_nonblock(sockfd); 397 return 0; 398 } 399 400 /* Characters considered whitespace in strsep calls. */ 401 #define WHITESPACE " \t\r\n" 402 #define QUOTE "\"" 403 404 /* return next token in configuration line */ 405 static char * 406 strdelim_internal(char **s, int split_equals) 407 { 408 char *old; 409 int wspace = 0; 410 411 if (*s == NULL) 412 return NULL; 413 414 old = *s; 415 416 *s = strpbrk(*s, 417 split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE); 418 if (*s == NULL) 419 return (old); 420 421 if (*s[0] == '\"') { 422 memmove(*s, *s + 1, strlen(*s)); /* move nul too */ 423 /* Find matching quote */ 424 if ((*s = strpbrk(*s, QUOTE)) == NULL) { 425 return (NULL); /* no matching quote */ 426 } else { 427 *s[0] = '\0'; 428 *s += strspn(*s + 1, WHITESPACE) + 1; 429 return (old); 430 } 431 } 432 433 /* Allow only one '=' to be skipped */ 434 if (split_equals && *s[0] == '=') 435 wspace = 1; 436 *s[0] = '\0'; 437 438 /* Skip any extra whitespace after first token */ 439 *s += strspn(*s + 1, WHITESPACE) + 1; 440 if (split_equals && *s[0] == '=' && !wspace) 441 *s += strspn(*s + 1, WHITESPACE) + 1; 442 443 return (old); 444 } 445 446 /* 447 * Return next token in configuration line; splts on whitespace or a 448 * single '=' character. 449 */ 450 char * 451 strdelim(char **s) 452 { 453 return strdelim_internal(s, 1); 454 } 455 456 /* 457 * Return next token in configuration line; splts on whitespace only. 458 */ 459 char * 460 strdelimw(char **s) 461 { 462 return strdelim_internal(s, 0); 463 } 464 465 struct passwd * 466 pwcopy(struct passwd *pw) 467 { 468 struct passwd *copy = xcalloc(1, sizeof(*copy)); 469 470 copy->pw_name = xstrdup(pw->pw_name); 471 copy->pw_passwd = xstrdup(pw->pw_passwd == NULL ? "*" : pw->pw_passwd); 472 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 473 copy->pw_gecos = xstrdup(pw->pw_gecos); 474 #endif 475 copy->pw_uid = pw->pw_uid; 476 copy->pw_gid = pw->pw_gid; 477 #ifdef HAVE_STRUCT_PASSWD_PW_EXPIRE 478 copy->pw_expire = pw->pw_expire; 479 #endif 480 #ifdef HAVE_STRUCT_PASSWD_PW_CHANGE 481 copy->pw_change = pw->pw_change; 482 #endif 483 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 484 copy->pw_class = xstrdup(pw->pw_class); 485 #endif 486 copy->pw_dir = xstrdup(pw->pw_dir); 487 copy->pw_shell = xstrdup(pw->pw_shell); 488 return copy; 489 } 490 491 /* 492 * Convert ASCII string to TCP/IP port number. 493 * Port must be >=0 and <=65535. 494 * Return -1 if invalid. 495 */ 496 int 497 a2port(const char *s) 498 { 499 struct servent *se; 500 long long port; 501 const char *errstr; 502 503 port = strtonum(s, 0, 65535, &errstr); 504 if (errstr == NULL) 505 return (int)port; 506 if ((se = getservbyname(s, "tcp")) != NULL) 507 return ntohs(se->s_port); 508 return -1; 509 } 510 511 int 512 a2tun(const char *s, int *remote) 513 { 514 const char *errstr = NULL; 515 char *sp, *ep; 516 int tun; 517 518 if (remote != NULL) { 519 *remote = SSH_TUNID_ANY; 520 sp = xstrdup(s); 521 if ((ep = strchr(sp, ':')) == NULL) { 522 free(sp); 523 return (a2tun(s, NULL)); 524 } 525 ep[0] = '\0'; ep++; 526 *remote = a2tun(ep, NULL); 527 tun = a2tun(sp, NULL); 528 free(sp); 529 return (*remote == SSH_TUNID_ERR ? *remote : tun); 530 } 531 532 if (strcasecmp(s, "any") == 0) 533 return (SSH_TUNID_ANY); 534 535 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); 536 if (errstr != NULL) 537 return (SSH_TUNID_ERR); 538 539 return (tun); 540 } 541 542 #define SECONDS 1 543 #define MINUTES (SECONDS * 60) 544 #define HOURS (MINUTES * 60) 545 #define DAYS (HOURS * 24) 546 #define WEEKS (DAYS * 7) 547 548 /* 549 * Convert a time string into seconds; format is 550 * a sequence of: 551 * time[qualifier] 552 * 553 * Valid time qualifiers are: 554 * <none> seconds 555 * s|S seconds 556 * m|M minutes 557 * h|H hours 558 * d|D days 559 * w|W weeks 560 * 561 * Examples: 562 * 90m 90 minutes 563 * 1h30m 90 minutes 564 * 2d 2 days 565 * 1w 1 week 566 * 567 * Return -1 if time string is invalid. 568 */ 569 int 570 convtime(const char *s) 571 { 572 long total, secs, multiplier; 573 const char *p; 574 char *endp; 575 576 errno = 0; 577 total = 0; 578 p = s; 579 580 if (p == NULL || *p == '\0') 581 return -1; 582 583 while (*p) { 584 secs = strtol(p, &endp, 10); 585 if (p == endp || 586 (errno == ERANGE && (secs == INT_MIN || secs == INT_MAX)) || 587 secs < 0) 588 return -1; 589 590 multiplier = 1; 591 switch (*endp++) { 592 case '\0': 593 endp--; 594 break; 595 case 's': 596 case 'S': 597 break; 598 case 'm': 599 case 'M': 600 multiplier = MINUTES; 601 break; 602 case 'h': 603 case 'H': 604 multiplier = HOURS; 605 break; 606 case 'd': 607 case 'D': 608 multiplier = DAYS; 609 break; 610 case 'w': 611 case 'W': 612 multiplier = WEEKS; 613 break; 614 default: 615 return -1; 616 } 617 if (secs > INT_MAX / multiplier) 618 return -1; 619 secs *= multiplier; 620 if (total > INT_MAX - secs) 621 return -1; 622 total += secs; 623 if (total < 0) 624 return -1; 625 p = endp; 626 } 627 628 return total; 629 } 630 631 #define TF_BUFS 8 632 #define TF_LEN 9 633 634 const char * 635 fmt_timeframe(time_t t) 636 { 637 char *buf; 638 static char tfbuf[TF_BUFS][TF_LEN]; /* ring buffer */ 639 static int idx = 0; 640 unsigned int sec, min, hrs, day; 641 unsigned long long week; 642 643 buf = tfbuf[idx++]; 644 if (idx == TF_BUFS) 645 idx = 0; 646 647 week = t; 648 649 sec = week % 60; 650 week /= 60; 651 min = week % 60; 652 week /= 60; 653 hrs = week % 24; 654 week /= 24; 655 day = week % 7; 656 week /= 7; 657 658 if (week > 0) 659 snprintf(buf, TF_LEN, "%02lluw%01ud%02uh", week, day, hrs); 660 else if (day > 0) 661 snprintf(buf, TF_LEN, "%01ud%02uh%02um", day, hrs, min); 662 else 663 snprintf(buf, TF_LEN, "%02u:%02u:%02u", hrs, min, sec); 664 665 return (buf); 666 } 667 668 /* 669 * Returns a standardized host+port identifier string. 670 * Caller must free returned string. 671 */ 672 char * 673 put_host_port(const char *host, u_short port) 674 { 675 char *hoststr; 676 677 if (port == 0 || port == SSH_DEFAULT_PORT) 678 return(xstrdup(host)); 679 if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1) 680 fatal("put_host_port: asprintf: %s", strerror(errno)); 681 debug3("put_host_port: %s", hoststr); 682 return hoststr; 683 } 684 685 /* 686 * Search for next delimiter between hostnames/addresses and ports. 687 * Argument may be modified (for termination). 688 * Returns *cp if parsing succeeds. 689 * *cp is set to the start of the next field, if one was found. 690 * The delimiter char, if present, is stored in delim. 691 * If this is the last field, *cp is set to NULL. 692 */ 693 char * 694 hpdelim2(char **cp, char *delim) 695 { 696 char *s, *old; 697 698 if (cp == NULL || *cp == NULL) 699 return NULL; 700 701 old = s = *cp; 702 if (*s == '[') { 703 if ((s = strchr(s, ']')) == NULL) 704 return NULL; 705 else 706 s++; 707 } else if ((s = strpbrk(s, ":/")) == NULL) 708 s = *cp + strlen(*cp); /* skip to end (see first case below) */ 709 710 switch (*s) { 711 case '\0': 712 *cp = NULL; /* no more fields*/ 713 break; 714 715 case ':': 716 case '/': 717 if (delim != NULL) 718 *delim = *s; 719 *s = '\0'; /* terminate */ 720 *cp = s + 1; 721 break; 722 723 default: 724 return NULL; 725 } 726 727 return old; 728 } 729 730 /* The common case: only accept colon as delimiter. */ 731 char * 732 hpdelim(char **cp) 733 { 734 char *r, delim = '\0'; 735 736 r = hpdelim2(cp, &delim); 737 if (delim == '/') 738 return NULL; 739 return r; 740 } 741 742 char * 743 cleanhostname(char *host) 744 { 745 if (*host == '[' && host[strlen(host) - 1] == ']') { 746 host[strlen(host) - 1] = '\0'; 747 return (host + 1); 748 } else 749 return host; 750 } 751 752 char * 753 colon(char *cp) 754 { 755 int flag = 0; 756 757 if (*cp == ':') /* Leading colon is part of file name. */ 758 return NULL; 759 if (*cp == '[') 760 flag = 1; 761 762 for (; *cp; ++cp) { 763 if (*cp == '@' && *(cp+1) == '[') 764 flag = 1; 765 if (*cp == ']' && *(cp+1) == ':' && flag) 766 return (cp+1); 767 if (*cp == ':' && !flag) 768 return (cp); 769 if (*cp == '/') 770 return NULL; 771 } 772 return NULL; 773 } 774 775 /* 776 * Parse a [user@]host:[path] string. 777 * Caller must free returned user, host and path. 778 * Any of the pointer return arguments may be NULL (useful for syntax checking). 779 * If user was not specified then *userp will be set to NULL. 780 * If host was not specified then *hostp will be set to NULL. 781 * If path was not specified then *pathp will be set to ".". 782 * Returns 0 on success, -1 on failure. 783 */ 784 int 785 parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp) 786 { 787 char *user = NULL, *host = NULL, *path = NULL; 788 char *sdup, *tmp; 789 int ret = -1; 790 791 if (userp != NULL) 792 *userp = NULL; 793 if (hostp != NULL) 794 *hostp = NULL; 795 if (pathp != NULL) 796 *pathp = NULL; 797 798 sdup = xstrdup(s); 799 800 /* Check for remote syntax: [user@]host:[path] */ 801 if ((tmp = colon(sdup)) == NULL) 802 goto out; 803 804 /* Extract optional path */ 805 *tmp++ = '\0'; 806 if (*tmp == '\0') 807 tmp = "."; 808 path = xstrdup(tmp); 809 810 /* Extract optional user and mandatory host */ 811 tmp = strrchr(sdup, '@'); 812 if (tmp != NULL) { 813 *tmp++ = '\0'; 814 host = xstrdup(cleanhostname(tmp)); 815 if (*sdup != '\0') 816 user = xstrdup(sdup); 817 } else { 818 host = xstrdup(cleanhostname(sdup)); 819 user = NULL; 820 } 821 822 /* Success */ 823 if (userp != NULL) { 824 *userp = user; 825 user = NULL; 826 } 827 if (hostp != NULL) { 828 *hostp = host; 829 host = NULL; 830 } 831 if (pathp != NULL) { 832 *pathp = path; 833 path = NULL; 834 } 835 ret = 0; 836 out: 837 free(sdup); 838 free(user); 839 free(host); 840 free(path); 841 return ret; 842 } 843 844 /* 845 * Parse a [user@]host[:port] string. 846 * Caller must free returned user and host. 847 * Any of the pointer return arguments may be NULL (useful for syntax checking). 848 * If user was not specified then *userp will be set to NULL. 849 * If port was not specified then *portp will be -1. 850 * Returns 0 on success, -1 on failure. 851 */ 852 int 853 parse_user_host_port(const char *s, char **userp, char **hostp, int *portp) 854 { 855 char *sdup, *cp, *tmp; 856 char *user = NULL, *host = NULL; 857 int port = -1, ret = -1; 858 859 if (userp != NULL) 860 *userp = NULL; 861 if (hostp != NULL) 862 *hostp = NULL; 863 if (portp != NULL) 864 *portp = -1; 865 866 if ((sdup = tmp = strdup(s)) == NULL) 867 return -1; 868 /* Extract optional username */ 869 if ((cp = strrchr(tmp, '@')) != NULL) { 870 *cp = '\0'; 871 if (*tmp == '\0') 872 goto out; 873 if ((user = strdup(tmp)) == NULL) 874 goto out; 875 tmp = cp + 1; 876 } 877 /* Extract mandatory hostname */ 878 if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0') 879 goto out; 880 host = xstrdup(cleanhostname(cp)); 881 /* Convert and verify optional port */ 882 if (tmp != NULL && *tmp != '\0') { 883 if ((port = a2port(tmp)) <= 0) 884 goto out; 885 } 886 /* Success */ 887 if (userp != NULL) { 888 *userp = user; 889 user = NULL; 890 } 891 if (hostp != NULL) { 892 *hostp = host; 893 host = NULL; 894 } 895 if (portp != NULL) 896 *portp = port; 897 ret = 0; 898 out: 899 free(sdup); 900 free(user); 901 free(host); 902 return ret; 903 } 904 905 /* 906 * Converts a two-byte hex string to decimal. 907 * Returns the decimal value or -1 for invalid input. 908 */ 909 static int 910 hexchar(const char *s) 911 { 912 unsigned char result[2]; 913 int i; 914 915 for (i = 0; i < 2; i++) { 916 if (s[i] >= '0' && s[i] <= '9') 917 result[i] = (unsigned char)(s[i] - '0'); 918 else if (s[i] >= 'a' && s[i] <= 'f') 919 result[i] = (unsigned char)(s[i] - 'a') + 10; 920 else if (s[i] >= 'A' && s[i] <= 'F') 921 result[i] = (unsigned char)(s[i] - 'A') + 10; 922 else 923 return -1; 924 } 925 return (result[0] << 4) | result[1]; 926 } 927 928 /* 929 * Decode an url-encoded string. 930 * Returns a newly allocated string on success or NULL on failure. 931 */ 932 static char * 933 urldecode(const char *src) 934 { 935 char *ret, *dst; 936 int ch; 937 size_t srclen; 938 939 if ((srclen = strlen(src)) >= SIZE_MAX) 940 fatal_f("input too large"); 941 ret = xmalloc(srclen + 1); 942 for (dst = ret; *src != '\0'; src++) { 943 switch (*src) { 944 case '+': 945 *dst++ = ' '; 946 break; 947 case '%': 948 if (!isxdigit((unsigned char)src[1]) || 949 !isxdigit((unsigned char)src[2]) || 950 (ch = hexchar(src + 1)) == -1) { 951 free(ret); 952 return NULL; 953 } 954 *dst++ = ch; 955 src += 2; 956 break; 957 default: 958 *dst++ = *src; 959 break; 960 } 961 } 962 *dst = '\0'; 963 964 return ret; 965 } 966 967 /* 968 * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI. 969 * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04 970 * Either user or path may be url-encoded (but not host or port). 971 * Caller must free returned user, host and path. 972 * Any of the pointer return arguments may be NULL (useful for syntax checking) 973 * but the scheme must always be specified. 974 * If user was not specified then *userp will be set to NULL. 975 * If port was not specified then *portp will be -1. 976 * If path was not specified then *pathp will be set to NULL. 977 * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri. 978 */ 979 int 980 parse_uri(const char *scheme, const char *uri, char **userp, char **hostp, 981 int *portp, char **pathp) 982 { 983 char *uridup, *cp, *tmp, ch; 984 char *user = NULL, *host = NULL, *path = NULL; 985 int port = -1, ret = -1; 986 size_t len; 987 988 len = strlen(scheme); 989 if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0) 990 return 1; 991 uri += len + 3; 992 993 if (userp != NULL) 994 *userp = NULL; 995 if (hostp != NULL) 996 *hostp = NULL; 997 if (portp != NULL) 998 *portp = -1; 999 if (pathp != NULL) 1000 *pathp = NULL; 1001 1002 uridup = tmp = xstrdup(uri); 1003 1004 /* Extract optional ssh-info (username + connection params) */ 1005 if ((cp = strchr(tmp, '@')) != NULL) { 1006 char *delim; 1007 1008 *cp = '\0'; 1009 /* Extract username and connection params */ 1010 if ((delim = strchr(tmp, ';')) != NULL) { 1011 /* Just ignore connection params for now */ 1012 *delim = '\0'; 1013 } 1014 if (*tmp == '\0') { 1015 /* Empty username */ 1016 goto out; 1017 } 1018 if ((user = urldecode(tmp)) == NULL) 1019 goto out; 1020 tmp = cp + 1; 1021 } 1022 1023 /* Extract mandatory hostname */ 1024 if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0') 1025 goto out; 1026 host = xstrdup(cleanhostname(cp)); 1027 if (!valid_domain(host, 0, NULL)) 1028 goto out; 1029 1030 if (tmp != NULL && *tmp != '\0') { 1031 if (ch == ':') { 1032 /* Convert and verify port. */ 1033 if ((cp = strchr(tmp, '/')) != NULL) 1034 *cp = '\0'; 1035 if ((port = a2port(tmp)) <= 0) 1036 goto out; 1037 tmp = cp ? cp + 1 : NULL; 1038 } 1039 if (tmp != NULL && *tmp != '\0') { 1040 /* Extract optional path */ 1041 if ((path = urldecode(tmp)) == NULL) 1042 goto out; 1043 } 1044 } 1045 1046 /* Success */ 1047 if (userp != NULL) { 1048 *userp = user; 1049 user = NULL; 1050 } 1051 if (hostp != NULL) { 1052 *hostp = host; 1053 host = NULL; 1054 } 1055 if (portp != NULL) 1056 *portp = port; 1057 if (pathp != NULL) { 1058 *pathp = path; 1059 path = NULL; 1060 } 1061 ret = 0; 1062 out: 1063 free(uridup); 1064 free(user); 1065 free(host); 1066 free(path); 1067 return ret; 1068 } 1069 1070 /* function to assist building execv() arguments */ 1071 void 1072 addargs(arglist *args, char *fmt, ...) 1073 { 1074 va_list ap; 1075 char *cp; 1076 u_int nalloc; 1077 int r; 1078 1079 va_start(ap, fmt); 1080 r = vasprintf(&cp, fmt, ap); 1081 va_end(ap); 1082 if (r == -1) 1083 fatal_f("argument too long"); 1084 1085 nalloc = args->nalloc; 1086 if (args->list == NULL) { 1087 nalloc = 32; 1088 args->num = 0; 1089 } else if (args->num > (256 * 1024)) 1090 fatal_f("too many arguments"); 1091 else if (args->num >= args->nalloc) 1092 fatal_f("arglist corrupt"); 1093 else if (args->num+2 >= nalloc) 1094 nalloc *= 2; 1095 1096 args->list = xrecallocarray(args->list, args->nalloc, 1097 nalloc, sizeof(char *)); 1098 args->nalloc = nalloc; 1099 args->list[args->num++] = cp; 1100 args->list[args->num] = NULL; 1101 } 1102 1103 void 1104 replacearg(arglist *args, u_int which, char *fmt, ...) 1105 { 1106 va_list ap; 1107 char *cp; 1108 int r; 1109 1110 va_start(ap, fmt); 1111 r = vasprintf(&cp, fmt, ap); 1112 va_end(ap); 1113 if (r == -1) 1114 fatal_f("argument too long"); 1115 if (args->list == NULL || args->num >= args->nalloc) 1116 fatal_f("arglist corrupt"); 1117 1118 if (which >= args->num) 1119 fatal_f("tried to replace invalid arg %d >= %d", 1120 which, args->num); 1121 free(args->list[which]); 1122 args->list[which] = cp; 1123 } 1124 1125 void 1126 freeargs(arglist *args) 1127 { 1128 u_int i; 1129 1130 if (args == NULL) 1131 return; 1132 if (args->list != NULL && args->num < args->nalloc) { 1133 for (i = 0; i < args->num; i++) 1134 free(args->list[i]); 1135 free(args->list); 1136 } 1137 args->nalloc = args->num = 0; 1138 args->list = NULL; 1139 } 1140 1141 /* 1142 * Expands tildes in the file name. Returns data allocated by xmalloc. 1143 * Warning: this calls getpw*. 1144 */ 1145 int 1146 tilde_expand(const char *filename, uid_t uid, char **retp) 1147 { 1148 char *ocopy = NULL, *copy, *s = NULL; 1149 const char *path = NULL, *user = NULL; 1150 struct passwd *pw; 1151 size_t len; 1152 int ret = -1, r, slash; 1153 1154 *retp = NULL; 1155 if (*filename != '~') { 1156 *retp = xstrdup(filename); 1157 return 0; 1158 } 1159 ocopy = copy = xstrdup(filename + 1); 1160 1161 if (*copy == '\0') /* ~ */ 1162 path = NULL; 1163 else if (*copy == '/') { 1164 copy += strspn(copy, "/"); 1165 if (*copy == '\0') 1166 path = NULL; /* ~/ */ 1167 else 1168 path = copy; /* ~/path */ 1169 } else { 1170 user = copy; 1171 if ((path = strchr(copy, '/')) != NULL) { 1172 copy[path - copy] = '\0'; 1173 path++; 1174 path += strspn(path, "/"); 1175 if (*path == '\0') /* ~user/ */ 1176 path = NULL; 1177 /* else ~user/path */ 1178 } 1179 /* else ~user */ 1180 } 1181 if (user != NULL) { 1182 if ((pw = getpwnam(user)) == NULL) { 1183 error_f("No such user %s", user); 1184 goto out; 1185 } 1186 } else if ((pw = getpwuid(uid)) == NULL) { 1187 error_f("No such uid %ld", (long)uid); 1188 goto out; 1189 } 1190 1191 /* Make sure directory has a trailing '/' */ 1192 slash = (len = strlen(pw->pw_dir)) == 0 || pw->pw_dir[len - 1] != '/'; 1193 1194 if ((r = xasprintf(&s, "%s%s%s", pw->pw_dir, 1195 slash ? "/" : "", path != NULL ? path : "")) <= 0) { 1196 error_f("xasprintf failed"); 1197 goto out; 1198 } 1199 if (r >= PATH_MAX) { 1200 error_f("Path too long"); 1201 goto out; 1202 } 1203 /* success */ 1204 ret = 0; 1205 *retp = s; 1206 s = NULL; 1207 out: 1208 free(s); 1209 free(ocopy); 1210 return ret; 1211 } 1212 1213 char * 1214 tilde_expand_filename(const char *filename, uid_t uid) 1215 { 1216 char *ret; 1217 1218 if (tilde_expand(filename, uid, &ret) != 0) 1219 cleanup_exit(255); 1220 return ret; 1221 } 1222 1223 /* 1224 * Expand a string with a set of %[char] escapes and/or ${ENVIRONMENT} 1225 * substitutions. A number of escapes may be specified as 1226 * (char *escape_chars, char *replacement) pairs. The list must be terminated 1227 * by a NULL escape_char. Returns replaced string in memory allocated by 1228 * xmalloc which the caller must free. 1229 */ 1230 static char * 1231 vdollar_percent_expand(int *parseerror, int dollar, int percent, 1232 const char *string, va_list ap) 1233 { 1234 #define EXPAND_MAX_KEYS 16 1235 u_int num_keys = 0, i; 1236 struct { 1237 const char *key; 1238 const char *repl; 1239 } keys[EXPAND_MAX_KEYS]; 1240 struct sshbuf *buf; 1241 int r, missingvar = 0; 1242 char *ret = NULL, *var, *varend, *val; 1243 size_t len; 1244 1245 if ((buf = sshbuf_new()) == NULL) 1246 fatal_f("sshbuf_new failed"); 1247 if (parseerror == NULL) 1248 fatal_f("null parseerror arg"); 1249 *parseerror = 1; 1250 1251 /* Gather keys if we're doing percent expansion. */ 1252 if (percent) { 1253 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { 1254 keys[num_keys].key = va_arg(ap, char *); 1255 if (keys[num_keys].key == NULL) 1256 break; 1257 keys[num_keys].repl = va_arg(ap, char *); 1258 if (keys[num_keys].repl == NULL) { 1259 fatal_f("NULL replacement for token %s", 1260 keys[num_keys].key); 1261 } 1262 } 1263 if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) 1264 fatal_f("too many keys"); 1265 if (num_keys == 0) 1266 fatal_f("percent expansion without token list"); 1267 } 1268 1269 /* Expand string */ 1270 for (i = 0; *string != '\0'; string++) { 1271 /* Optionally process ${ENVIRONMENT} expansions. */ 1272 if (dollar && string[0] == '$' && string[1] == '{') { 1273 string += 2; /* skip over '${' */ 1274 if ((varend = strchr(string, '}')) == NULL) { 1275 error_f("environment variable '%s' missing " 1276 "closing '}'", string); 1277 goto out; 1278 } 1279 len = varend - string; 1280 if (len == 0) { 1281 error_f("zero-length environment variable"); 1282 goto out; 1283 } 1284 var = xmalloc(len + 1); 1285 (void)strlcpy(var, string, len + 1); 1286 if ((val = getenv(var)) == NULL) { 1287 error_f("env var ${%s} has no value", var); 1288 missingvar = 1; 1289 } else { 1290 debug3_f("expand ${%s} -> '%s'", var, val); 1291 if ((r = sshbuf_put(buf, val, strlen(val))) !=0) 1292 fatal_fr(r, "sshbuf_put ${}"); 1293 } 1294 free(var); 1295 string += len; 1296 continue; 1297 } 1298 1299 /* 1300 * Process percent expansions if we have a list of TOKENs. 1301 * If we're not doing percent expansion everything just gets 1302 * appended here. 1303 */ 1304 if (*string != '%' || !percent) { 1305 append: 1306 if ((r = sshbuf_put_u8(buf, *string)) != 0) 1307 fatal_fr(r, "sshbuf_put_u8 %%"); 1308 continue; 1309 } 1310 string++; 1311 /* %% case */ 1312 if (*string == '%') 1313 goto append; 1314 if (*string == '\0') { 1315 error_f("invalid format"); 1316 goto out; 1317 } 1318 for (i = 0; i < num_keys; i++) { 1319 if (strchr(keys[i].key, *string) != NULL) { 1320 if ((r = sshbuf_put(buf, keys[i].repl, 1321 strlen(keys[i].repl))) != 0) 1322 fatal_fr(r, "sshbuf_put %%-repl"); 1323 break; 1324 } 1325 } 1326 if (i >= num_keys) { 1327 error_f("unknown key %%%c", *string); 1328 goto out; 1329 } 1330 } 1331 if (!missingvar && (ret = sshbuf_dup_string(buf)) == NULL) 1332 fatal_f("sshbuf_dup_string failed"); 1333 *parseerror = 0; 1334 out: 1335 sshbuf_free(buf); 1336 return *parseerror ? NULL : ret; 1337 #undef EXPAND_MAX_KEYS 1338 } 1339 1340 /* 1341 * Expand only environment variables. 1342 * Note that although this function is variadic like the other similar 1343 * functions, any such arguments will be unused. 1344 */ 1345 1346 char * 1347 dollar_expand(int *parseerr, const char *string, ...) 1348 { 1349 char *ret; 1350 int err; 1351 va_list ap; 1352 1353 va_start(ap, string); 1354 ret = vdollar_percent_expand(&err, 1, 0, string, ap); 1355 va_end(ap); 1356 if (parseerr != NULL) 1357 *parseerr = err; 1358 return ret; 1359 } 1360 1361 /* 1362 * Returns expanded string or NULL if a specified environment variable is 1363 * not defined, or calls fatal if the string is invalid. 1364 */ 1365 char * 1366 percent_expand(const char *string, ...) 1367 { 1368 char *ret; 1369 int err; 1370 va_list ap; 1371 1372 va_start(ap, string); 1373 ret = vdollar_percent_expand(&err, 0, 1, string, ap); 1374 va_end(ap); 1375 if (err) 1376 fatal_f("failed"); 1377 return ret; 1378 } 1379 1380 /* 1381 * Returns expanded string or NULL if a specified environment variable is 1382 * not defined, or calls fatal if the string is invalid. 1383 */ 1384 char * 1385 percent_dollar_expand(const char *string, ...) 1386 { 1387 char *ret; 1388 int err; 1389 va_list ap; 1390 1391 va_start(ap, string); 1392 ret = vdollar_percent_expand(&err, 1, 1, string, ap); 1393 va_end(ap); 1394 if (err) 1395 fatal_f("failed"); 1396 return ret; 1397 } 1398 1399 int 1400 tun_open(int tun, int mode, char **ifname) 1401 { 1402 #if defined(CUSTOM_SYS_TUN_OPEN) 1403 return (sys_tun_open(tun, mode, ifname)); 1404 #elif defined(SSH_TUN_OPENBSD) 1405 struct ifreq ifr; 1406 char name[100]; 1407 int fd = -1, sock; 1408 const char *tunbase = "tun"; 1409 1410 if (ifname != NULL) 1411 *ifname = NULL; 1412 1413 if (mode == SSH_TUNMODE_ETHERNET) 1414 tunbase = "tap"; 1415 1416 /* Open the tunnel device */ 1417 if (tun <= SSH_TUNID_MAX) { 1418 snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); 1419 fd = open(name, O_RDWR); 1420 } else if (tun == SSH_TUNID_ANY) { 1421 for (tun = 100; tun >= 0; tun--) { 1422 snprintf(name, sizeof(name), "/dev/%s%d", 1423 tunbase, tun); 1424 if ((fd = open(name, O_RDWR)) >= 0) 1425 break; 1426 } 1427 } else { 1428 debug_f("invalid tunnel %u", tun); 1429 return -1; 1430 } 1431 1432 if (fd == -1) { 1433 debug_f("%s open: %s", name, strerror(errno)); 1434 return -1; 1435 } 1436 1437 debug_f("%s mode %d fd %d", name, mode, fd); 1438 1439 /* Bring interface up if it is not already */ 1440 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); 1441 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) 1442 goto failed; 1443 1444 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) { 1445 debug_f("get interface %s flags: %s", ifr.ifr_name, 1446 strerror(errno)); 1447 goto failed; 1448 } 1449 1450 if (!(ifr.ifr_flags & IFF_UP)) { 1451 ifr.ifr_flags |= IFF_UP; 1452 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) { 1453 debug_f("activate interface %s: %s", ifr.ifr_name, 1454 strerror(errno)); 1455 goto failed; 1456 } 1457 } 1458 1459 if (ifname != NULL) 1460 *ifname = xstrdup(ifr.ifr_name); 1461 1462 close(sock); 1463 return fd; 1464 1465 failed: 1466 if (fd >= 0) 1467 close(fd); 1468 if (sock >= 0) 1469 close(sock); 1470 return -1; 1471 #else 1472 error("Tunnel interfaces are not supported on this platform"); 1473 return (-1); 1474 #endif 1475 } 1476 1477 void 1478 sanitise_stdfd(void) 1479 { 1480 int nullfd, dupfd; 1481 1482 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { 1483 fprintf(stderr, "Couldn't open /dev/null: %s\n", 1484 strerror(errno)); 1485 exit(1); 1486 } 1487 while (++dupfd <= STDERR_FILENO) { 1488 /* Only populate closed fds. */ 1489 if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) { 1490 if (dup2(nullfd, dupfd) == -1) { 1491 fprintf(stderr, "dup2: %s\n", strerror(errno)); 1492 exit(1); 1493 } 1494 } 1495 } 1496 if (nullfd > STDERR_FILENO) 1497 close(nullfd); 1498 } 1499 1500 char * 1501 tohex(const void *vp, size_t l) 1502 { 1503 const u_char *p = (const u_char *)vp; 1504 char b[3], *r; 1505 size_t i, hl; 1506 1507 if (l > 65536) 1508 return xstrdup("tohex: length > 65536"); 1509 1510 hl = l * 2 + 1; 1511 r = xcalloc(1, hl); 1512 for (i = 0; i < l; i++) { 1513 snprintf(b, sizeof(b), "%02x", p[i]); 1514 strlcat(r, b, hl); 1515 } 1516 return (r); 1517 } 1518 1519 /* 1520 * Extend string *sp by the specified format. If *sp is not NULL (or empty), 1521 * then the separator 'sep' will be prepended before the formatted arguments. 1522 * Extended strings are heap allocated. 1523 */ 1524 void 1525 xextendf(char **sp, const char *sep, const char *fmt, ...) 1526 { 1527 va_list ap; 1528 char *tmp1, *tmp2; 1529 1530 va_start(ap, fmt); 1531 xvasprintf(&tmp1, fmt, ap); 1532 va_end(ap); 1533 1534 if (*sp == NULL || **sp == '\0') { 1535 free(*sp); 1536 *sp = tmp1; 1537 return; 1538 } 1539 xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL ? "" : sep, tmp1); 1540 free(tmp1); 1541 free(*sp); 1542 *sp = tmp2; 1543 } 1544 1545 1546 u_int64_t 1547 get_u64(const void *vp) 1548 { 1549 const u_char *p = (const u_char *)vp; 1550 u_int64_t v; 1551 1552 v = (u_int64_t)p[0] << 56; 1553 v |= (u_int64_t)p[1] << 48; 1554 v |= (u_int64_t)p[2] << 40; 1555 v |= (u_int64_t)p[3] << 32; 1556 v |= (u_int64_t)p[4] << 24; 1557 v |= (u_int64_t)p[5] << 16; 1558 v |= (u_int64_t)p[6] << 8; 1559 v |= (u_int64_t)p[7]; 1560 1561 return (v); 1562 } 1563 1564 u_int32_t 1565 get_u32(const void *vp) 1566 { 1567 const u_char *p = (const u_char *)vp; 1568 u_int32_t v; 1569 1570 v = (u_int32_t)p[0] << 24; 1571 v |= (u_int32_t)p[1] << 16; 1572 v |= (u_int32_t)p[2] << 8; 1573 v |= (u_int32_t)p[3]; 1574 1575 return (v); 1576 } 1577 1578 u_int32_t 1579 get_u32_le(const void *vp) 1580 { 1581 const u_char *p = (const u_char *)vp; 1582 u_int32_t v; 1583 1584 v = (u_int32_t)p[0]; 1585 v |= (u_int32_t)p[1] << 8; 1586 v |= (u_int32_t)p[2] << 16; 1587 v |= (u_int32_t)p[3] << 24; 1588 1589 return (v); 1590 } 1591 1592 u_int16_t 1593 get_u16(const void *vp) 1594 { 1595 const u_char *p = (const u_char *)vp; 1596 u_int16_t v; 1597 1598 v = (u_int16_t)p[0] << 8; 1599 v |= (u_int16_t)p[1]; 1600 1601 return (v); 1602 } 1603 1604 void 1605 put_u64(void *vp, u_int64_t v) 1606 { 1607 u_char *p = (u_char *)vp; 1608 1609 p[0] = (u_char)(v >> 56) & 0xff; 1610 p[1] = (u_char)(v >> 48) & 0xff; 1611 p[2] = (u_char)(v >> 40) & 0xff; 1612 p[3] = (u_char)(v >> 32) & 0xff; 1613 p[4] = (u_char)(v >> 24) & 0xff; 1614 p[5] = (u_char)(v >> 16) & 0xff; 1615 p[6] = (u_char)(v >> 8) & 0xff; 1616 p[7] = (u_char)v & 0xff; 1617 } 1618 1619 void 1620 put_u32(void *vp, u_int32_t v) 1621 { 1622 u_char *p = (u_char *)vp; 1623 1624 p[0] = (u_char)(v >> 24) & 0xff; 1625 p[1] = (u_char)(v >> 16) & 0xff; 1626 p[2] = (u_char)(v >> 8) & 0xff; 1627 p[3] = (u_char)v & 0xff; 1628 } 1629 1630 void 1631 put_u32_le(void *vp, u_int32_t v) 1632 { 1633 u_char *p = (u_char *)vp; 1634 1635 p[0] = (u_char)v & 0xff; 1636 p[1] = (u_char)(v >> 8) & 0xff; 1637 p[2] = (u_char)(v >> 16) & 0xff; 1638 p[3] = (u_char)(v >> 24) & 0xff; 1639 } 1640 1641 void 1642 put_u16(void *vp, u_int16_t v) 1643 { 1644 u_char *p = (u_char *)vp; 1645 1646 p[0] = (u_char)(v >> 8) & 0xff; 1647 p[1] = (u_char)v & 0xff; 1648 } 1649 1650 void 1651 ms_subtract_diff(struct timeval *start, int *ms) 1652 { 1653 struct timeval diff, finish; 1654 1655 monotime_tv(&finish); 1656 timersub(&finish, start, &diff); 1657 *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); 1658 } 1659 1660 void 1661 ms_to_timespec(struct timespec *ts, int ms) 1662 { 1663 if (ms < 0) 1664 ms = 0; 1665 ts->tv_sec = ms / 1000; 1666 ts->tv_nsec = (ms % 1000) * 1000 * 1000; 1667 } 1668 1669 void 1670 monotime_ts(struct timespec *ts) 1671 { 1672 struct timeval tv; 1673 #if defined(HAVE_CLOCK_GETTIME) && (defined(CLOCK_BOOTTIME) || \ 1674 defined(CLOCK_MONOTONIC) || defined(CLOCK_REALTIME)) 1675 static int gettime_failed = 0; 1676 1677 if (!gettime_failed) { 1678 # ifdef CLOCK_BOOTTIME 1679 if (clock_gettime(CLOCK_BOOTTIME, ts) == 0) 1680 return; 1681 # endif /* CLOCK_BOOTTIME */ 1682 # ifdef CLOCK_MONOTONIC 1683 if (clock_gettime(CLOCK_MONOTONIC, ts) == 0) 1684 return; 1685 # endif /* CLOCK_MONOTONIC */ 1686 # ifdef CLOCK_REALTIME 1687 /* Not monotonic, but we're almost out of options here. */ 1688 if (clock_gettime(CLOCK_REALTIME, ts) == 0) 1689 return; 1690 # endif /* CLOCK_REALTIME */ 1691 debug3("clock_gettime: %s", strerror(errno)); 1692 gettime_failed = 1; 1693 } 1694 #endif /* HAVE_CLOCK_GETTIME && (BOOTTIME || MONOTONIC || REALTIME) */ 1695 gettimeofday(&tv, NULL); 1696 ts->tv_sec = tv.tv_sec; 1697 ts->tv_nsec = (long)tv.tv_usec * 1000; 1698 } 1699 1700 void 1701 monotime_tv(struct timeval *tv) 1702 { 1703 struct timespec ts; 1704 1705 monotime_ts(&ts); 1706 tv->tv_sec = ts.tv_sec; 1707 tv->tv_usec = ts.tv_nsec / 1000; 1708 } 1709 1710 time_t 1711 monotime(void) 1712 { 1713 struct timespec ts; 1714 1715 monotime_ts(&ts); 1716 return ts.tv_sec; 1717 } 1718 1719 double 1720 monotime_double(void) 1721 { 1722 struct timespec ts; 1723 1724 monotime_ts(&ts); 1725 return ts.tv_sec + ((double)ts.tv_nsec / 1000000000); 1726 } 1727 1728 void 1729 bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) 1730 { 1731 bw->buflen = buflen; 1732 bw->rate = kbps; 1733 bw->thresh = buflen; 1734 bw->lamt = 0; 1735 timerclear(&bw->bwstart); 1736 timerclear(&bw->bwend); 1737 } 1738 1739 /* Callback from read/write loop to insert bandwidth-limiting delays */ 1740 void 1741 bandwidth_limit(struct bwlimit *bw, size_t read_len) 1742 { 1743 u_int64_t waitlen; 1744 struct timespec ts, rm; 1745 1746 bw->lamt += read_len; 1747 if (!timerisset(&bw->bwstart)) { 1748 monotime_tv(&bw->bwstart); 1749 return; 1750 } 1751 if (bw->lamt < bw->thresh) 1752 return; 1753 1754 monotime_tv(&bw->bwend); 1755 timersub(&bw->bwend, &bw->bwstart, &bw->bwend); 1756 if (!timerisset(&bw->bwend)) 1757 return; 1758 1759 bw->lamt *= 8; 1760 waitlen = (double)1000000L * bw->lamt / bw->rate; 1761 1762 bw->bwstart.tv_sec = waitlen / 1000000L; 1763 bw->bwstart.tv_usec = waitlen % 1000000L; 1764 1765 if (timercmp(&bw->bwstart, &bw->bwend, >)) { 1766 timersub(&bw->bwstart, &bw->bwend, &bw->bwend); 1767 1768 /* Adjust the wait time */ 1769 if (bw->bwend.tv_sec) { 1770 bw->thresh /= 2; 1771 if (bw->thresh < bw->buflen / 4) 1772 bw->thresh = bw->buflen / 4; 1773 } else if (bw->bwend.tv_usec < 10000) { 1774 bw->thresh *= 2; 1775 if (bw->thresh > bw->buflen * 8) 1776 bw->thresh = bw->buflen * 8; 1777 } 1778 1779 TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); 1780 while (nanosleep(&ts, &rm) == -1) { 1781 if (errno != EINTR) 1782 break; 1783 ts = rm; 1784 } 1785 } 1786 1787 bw->lamt = 0; 1788 monotime_tv(&bw->bwstart); 1789 } 1790 1791 /* Make a template filename for mk[sd]temp() */ 1792 void 1793 mktemp_proto(char *s, size_t len) 1794 { 1795 const char *tmpdir; 1796 int r; 1797 1798 if ((tmpdir = getenv("TMPDIR")) != NULL) { 1799 r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); 1800 if (r > 0 && (size_t)r < len) 1801 return; 1802 } 1803 r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); 1804 if (r < 0 || (size_t)r >= len) 1805 fatal_f("template string too short"); 1806 } 1807 1808 static const struct { 1809 const char *name; 1810 int value; 1811 } ipqos[] = { 1812 { "none", INT_MAX }, /* can't use 0 here; that's CS0 */ 1813 { "af11", IPTOS_DSCP_AF11 }, 1814 { "af12", IPTOS_DSCP_AF12 }, 1815 { "af13", IPTOS_DSCP_AF13 }, 1816 { "af21", IPTOS_DSCP_AF21 }, 1817 { "af22", IPTOS_DSCP_AF22 }, 1818 { "af23", IPTOS_DSCP_AF23 }, 1819 { "af31", IPTOS_DSCP_AF31 }, 1820 { "af32", IPTOS_DSCP_AF32 }, 1821 { "af33", IPTOS_DSCP_AF33 }, 1822 { "af41", IPTOS_DSCP_AF41 }, 1823 { "af42", IPTOS_DSCP_AF42 }, 1824 { "af43", IPTOS_DSCP_AF43 }, 1825 { "cs0", IPTOS_DSCP_CS0 }, 1826 { "cs1", IPTOS_DSCP_CS1 }, 1827 { "cs2", IPTOS_DSCP_CS2 }, 1828 { "cs3", IPTOS_DSCP_CS3 }, 1829 { "cs4", IPTOS_DSCP_CS4 }, 1830 { "cs5", IPTOS_DSCP_CS5 }, 1831 { "cs6", IPTOS_DSCP_CS6 }, 1832 { "cs7", IPTOS_DSCP_CS7 }, 1833 { "ef", IPTOS_DSCP_EF }, 1834 { "le", IPTOS_DSCP_LE }, 1835 { "lowdelay", IPTOS_LOWDELAY }, 1836 { "throughput", IPTOS_THROUGHPUT }, 1837 { "reliability", IPTOS_RELIABILITY }, 1838 { NULL, -1 } 1839 }; 1840 1841 int 1842 parse_ipqos(const char *cp) 1843 { 1844 u_int i; 1845 char *ep; 1846 long val; 1847 1848 if (cp == NULL) 1849 return -1; 1850 for (i = 0; ipqos[i].name != NULL; i++) { 1851 if (strcasecmp(cp, ipqos[i].name) == 0) 1852 return ipqos[i].value; 1853 } 1854 /* Try parsing as an integer */ 1855 val = strtol(cp, &ep, 0); 1856 if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) 1857 return -1; 1858 return val; 1859 } 1860 1861 const char * 1862 iptos2str(int iptos) 1863 { 1864 int i; 1865 static char iptos_str[sizeof "0xff"]; 1866 1867 for (i = 0; ipqos[i].name != NULL; i++) { 1868 if (ipqos[i].value == iptos) 1869 return ipqos[i].name; 1870 } 1871 snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); 1872 return iptos_str; 1873 } 1874 1875 void 1876 lowercase(char *s) 1877 { 1878 for (; *s; s++) 1879 *s = tolower((u_char)*s); 1880 } 1881 1882 int 1883 unix_listener(const char *path, int backlog, int unlink_first) 1884 { 1885 struct sockaddr_un sunaddr; 1886 int saved_errno, sock; 1887 1888 memset(&sunaddr, 0, sizeof(sunaddr)); 1889 sunaddr.sun_family = AF_UNIX; 1890 if (strlcpy(sunaddr.sun_path, path, 1891 sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { 1892 error_f("path \"%s\" too long for Unix domain socket", path); 1893 errno = ENAMETOOLONG; 1894 return -1; 1895 } 1896 1897 sock = socket(PF_UNIX, SOCK_STREAM, 0); 1898 if (sock == -1) { 1899 saved_errno = errno; 1900 error_f("socket: %.100s", strerror(errno)); 1901 errno = saved_errno; 1902 return -1; 1903 } 1904 if (unlink_first == 1) { 1905 if (unlink(path) != 0 && errno != ENOENT) 1906 error("unlink(%s): %.100s", path, strerror(errno)); 1907 } 1908 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) { 1909 saved_errno = errno; 1910 error_f("cannot bind to path %s: %s", path, strerror(errno)); 1911 close(sock); 1912 errno = saved_errno; 1913 return -1; 1914 } 1915 if (listen(sock, backlog) == -1) { 1916 saved_errno = errno; 1917 error_f("cannot listen on path %s: %s", path, strerror(errno)); 1918 close(sock); 1919 unlink(path); 1920 errno = saved_errno; 1921 return -1; 1922 } 1923 return sock; 1924 } 1925 1926 void 1927 sock_set_v6only(int s) 1928 { 1929 #if defined(IPV6_V6ONLY) && !defined(__OpenBSD__) 1930 int on = 1; 1931 1932 debug3("%s: set socket %d IPV6_V6ONLY", __func__, s); 1933 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1) 1934 error("setsockopt IPV6_V6ONLY: %s", strerror(errno)); 1935 #endif 1936 } 1937 1938 /* 1939 * Compares two strings that maybe be NULL. Returns non-zero if strings 1940 * are both NULL or are identical, returns zero otherwise. 1941 */ 1942 static int 1943 strcmp_maybe_null(const char *a, const char *b) 1944 { 1945 if ((a == NULL && b != NULL) || (a != NULL && b == NULL)) 1946 return 0; 1947 if (a != NULL && strcmp(a, b) != 0) 1948 return 0; 1949 return 1; 1950 } 1951 1952 /* 1953 * Compare two forwards, returning non-zero if they are identical or 1954 * zero otherwise. 1955 */ 1956 int 1957 forward_equals(const struct Forward *a, const struct Forward *b) 1958 { 1959 if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0) 1960 return 0; 1961 if (a->listen_port != b->listen_port) 1962 return 0; 1963 if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0) 1964 return 0; 1965 if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0) 1966 return 0; 1967 if (a->connect_port != b->connect_port) 1968 return 0; 1969 if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0) 1970 return 0; 1971 /* allocated_port and handle are not checked */ 1972 return 1; 1973 } 1974 1975 /* returns 1 if process is already daemonized, 0 otherwise */ 1976 int 1977 daemonized(void) 1978 { 1979 int fd; 1980 1981 if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) { 1982 close(fd); 1983 return 0; /* have controlling terminal */ 1984 } 1985 if (getppid() != 1) 1986 return 0; /* parent is not init */ 1987 if (getsid(0) != getpid()) 1988 return 0; /* not session leader */ 1989 debug3("already daemonized"); 1990 return 1; 1991 } 1992 1993 /* 1994 * Splits 's' into an argument vector. Handles quoted string and basic 1995 * escape characters (\\, \", \'). Caller must free the argument vector 1996 * and its members. 1997 */ 1998 int 1999 argv_split(const char *s, int *argcp, char ***argvp, int terminate_on_comment) 2000 { 2001 int r = SSH_ERR_INTERNAL_ERROR; 2002 int argc = 0, quote, i, j; 2003 char *arg, **argv = xcalloc(1, sizeof(*argv)); 2004 2005 *argvp = NULL; 2006 *argcp = 0; 2007 2008 for (i = 0; s[i] != '\0'; i++) { 2009 /* Skip leading whitespace */ 2010 if (s[i] == ' ' || s[i] == '\t') 2011 continue; 2012 if (terminate_on_comment && s[i] == '#') 2013 break; 2014 /* Start of a token */ 2015 quote = 0; 2016 2017 argv = xreallocarray(argv, (argc + 2), sizeof(*argv)); 2018 arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1); 2019 argv[argc] = NULL; 2020 2021 /* Copy the token in, removing escapes */ 2022 for (j = 0; s[i] != '\0'; i++) { 2023 if (s[i] == '\\') { 2024 if (s[i + 1] == '\'' || 2025 s[i + 1] == '\"' || 2026 s[i + 1] == '\\' || 2027 (quote == 0 && s[i + 1] == ' ')) { 2028 i++; /* Skip '\' */ 2029 arg[j++] = s[i]; 2030 } else { 2031 /* Unrecognised escape */ 2032 arg[j++] = s[i]; 2033 } 2034 } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t')) 2035 break; /* done */ 2036 else if (quote == 0 && (s[i] == '\"' || s[i] == '\'')) 2037 quote = s[i]; /* quote start */ 2038 else if (quote != 0 && s[i] == quote) 2039 quote = 0; /* quote end */ 2040 else 2041 arg[j++] = s[i]; 2042 } 2043 if (s[i] == '\0') { 2044 if (quote != 0) { 2045 /* Ran out of string looking for close quote */ 2046 r = SSH_ERR_INVALID_FORMAT; 2047 goto out; 2048 } 2049 break; 2050 } 2051 } 2052 /* Success */ 2053 *argcp = argc; 2054 *argvp = argv; 2055 argc = 0; 2056 argv = NULL; 2057 r = 0; 2058 out: 2059 if (argc != 0 && argv != NULL) { 2060 for (i = 0; i < argc; i++) 2061 free(argv[i]); 2062 free(argv); 2063 } 2064 return r; 2065 } 2066 2067 /* 2068 * Reassemble an argument vector into a string, quoting and escaping as 2069 * necessary. Caller must free returned string. 2070 */ 2071 char * 2072 argv_assemble(int argc, char **argv) 2073 { 2074 int i, j, ws, r; 2075 char c, *ret; 2076 struct sshbuf *buf, *arg; 2077 2078 if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL) 2079 fatal_f("sshbuf_new failed"); 2080 2081 for (i = 0; i < argc; i++) { 2082 ws = 0; 2083 sshbuf_reset(arg); 2084 for (j = 0; argv[i][j] != '\0'; j++) { 2085 r = 0; 2086 c = argv[i][j]; 2087 switch (c) { 2088 case ' ': 2089 case '\t': 2090 ws = 1; 2091 r = sshbuf_put_u8(arg, c); 2092 break; 2093 case '\\': 2094 case '\'': 2095 case '"': 2096 if ((r = sshbuf_put_u8(arg, '\\')) != 0) 2097 break; 2098 /* FALLTHROUGH */ 2099 default: 2100 r = sshbuf_put_u8(arg, c); 2101 break; 2102 } 2103 if (r != 0) 2104 fatal_fr(r, "sshbuf_put_u8"); 2105 } 2106 if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) || 2107 (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) || 2108 (r = sshbuf_putb(buf, arg)) != 0 || 2109 (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0)) 2110 fatal_fr(r, "assemble"); 2111 } 2112 if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL) 2113 fatal_f("malloc failed"); 2114 memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf)); 2115 ret[sshbuf_len(buf)] = '\0'; 2116 sshbuf_free(buf); 2117 sshbuf_free(arg); 2118 return ret; 2119 } 2120 2121 char * 2122 argv_next(int *argcp, char ***argvp) 2123 { 2124 char *ret = (*argvp)[0]; 2125 2126 if (*argcp > 0 && ret != NULL) { 2127 (*argcp)--; 2128 (*argvp)++; 2129 } 2130 return ret; 2131 } 2132 2133 void 2134 argv_consume(int *argcp) 2135 { 2136 *argcp = 0; 2137 } 2138 2139 void 2140 argv_free(char **av, int ac) 2141 { 2142 int i; 2143 2144 if (av == NULL) 2145 return; 2146 for (i = 0; i < ac; i++) 2147 free(av[i]); 2148 free(av); 2149 } 2150 2151 /* Returns 0 if pid exited cleanly, non-zero otherwise */ 2152 int 2153 exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet) 2154 { 2155 int status; 2156 2157 while (waitpid(pid, &status, 0) == -1) { 2158 if (errno != EINTR) { 2159 error("%s waitpid: %s", tag, strerror(errno)); 2160 return -1; 2161 } 2162 } 2163 if (WIFSIGNALED(status)) { 2164 error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status)); 2165 return -1; 2166 } else if (WEXITSTATUS(status) != 0) { 2167 do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO, 2168 "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status)); 2169 return -1; 2170 } 2171 return 0; 2172 } 2173 2174 /* 2175 * Check a given path for security. This is defined as all components 2176 * of the path to the file must be owned by either the owner of 2177 * of the file or root and no directories must be group or world writable. 2178 * 2179 * XXX Should any specific check be done for sym links ? 2180 * 2181 * Takes a file name, its stat information (preferably from fstat() to 2182 * avoid races), the uid of the expected owner, their home directory and an 2183 * error buffer plus max size as arguments. 2184 * 2185 * Returns 0 on success and -1 on failure 2186 */ 2187 int 2188 safe_path(const char *name, struct stat *stp, const char *pw_dir, 2189 uid_t uid, char *err, size_t errlen) 2190 { 2191 char buf[PATH_MAX], homedir[PATH_MAX]; 2192 char *cp; 2193 int comparehome = 0; 2194 struct stat st; 2195 2196 if (realpath(name, buf) == NULL) { 2197 snprintf(err, errlen, "realpath %s failed: %s", name, 2198 strerror(errno)); 2199 return -1; 2200 } 2201 if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) 2202 comparehome = 1; 2203 2204 if (!S_ISREG(stp->st_mode)) { 2205 snprintf(err, errlen, "%s is not a regular file", buf); 2206 return -1; 2207 } 2208 if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) || 2209 (stp->st_mode & 022) != 0) { 2210 snprintf(err, errlen, "bad ownership or modes for file %s", 2211 buf); 2212 return -1; 2213 } 2214 2215 /* for each component of the canonical path, walking upwards */ 2216 for (;;) { 2217 if ((cp = dirname(buf)) == NULL) { 2218 snprintf(err, errlen, "dirname() failed"); 2219 return -1; 2220 } 2221 strlcpy(buf, cp, sizeof(buf)); 2222 2223 if (stat(buf, &st) == -1 || 2224 (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) || 2225 (st.st_mode & 022) != 0) { 2226 snprintf(err, errlen, 2227 "bad ownership or modes for directory %s", buf); 2228 return -1; 2229 } 2230 2231 /* If are past the homedir then we can stop */ 2232 if (comparehome && strcmp(homedir, buf) == 0) 2233 break; 2234 2235 /* 2236 * dirname should always complete with a "/" path, 2237 * but we can be paranoid and check for "." too 2238 */ 2239 if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) 2240 break; 2241 } 2242 return 0; 2243 } 2244 2245 /* 2246 * Version of safe_path() that accepts an open file descriptor to 2247 * avoid races. 2248 * 2249 * Returns 0 on success and -1 on failure 2250 */ 2251 int 2252 safe_path_fd(int fd, const char *file, struct passwd *pw, 2253 char *err, size_t errlen) 2254 { 2255 struct stat st; 2256 2257 /* check the open file to avoid races */ 2258 if (fstat(fd, &st) == -1) { 2259 snprintf(err, errlen, "cannot stat file %s: %s", 2260 file, strerror(errno)); 2261 return -1; 2262 } 2263 return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); 2264 } 2265 2266 /* 2267 * Sets the value of the given variable in the environment. If the variable 2268 * already exists, its value is overridden. 2269 */ 2270 void 2271 child_set_env(char ***envp, u_int *envsizep, const char *name, 2272 const char *value) 2273 { 2274 char **env; 2275 u_int envsize; 2276 u_int i, namelen; 2277 2278 if (strchr(name, '=') != NULL) { 2279 error("Invalid environment variable \"%.100s\"", name); 2280 return; 2281 } 2282 2283 /* 2284 * If we're passed an uninitialized list, allocate a single null 2285 * entry before continuing. 2286 */ 2287 if ((*envp == NULL) != (*envsizep == 0)) 2288 fatal_f("environment size mismatch"); 2289 if (*envp == NULL && *envsizep == 0) { 2290 *envp = xmalloc(sizeof(char *)); 2291 *envp[0] = NULL; 2292 *envsizep = 1; 2293 } 2294 2295 /* 2296 * Find the slot where the value should be stored. If the variable 2297 * already exists, we reuse the slot; otherwise we append a new slot 2298 * at the end of the array, expanding if necessary. 2299 */ 2300 env = *envp; 2301 namelen = strlen(name); 2302 for (i = 0; env[i]; i++) 2303 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') 2304 break; 2305 if (env[i]) { 2306 /* Reuse the slot. */ 2307 free(env[i]); 2308 } else { 2309 /* New variable. Expand if necessary. */ 2310 envsize = *envsizep; 2311 if (i >= envsize - 1) { 2312 if (envsize >= 1000) 2313 fatal("child_set_env: too many env vars"); 2314 envsize += 50; 2315 env = (*envp) = xreallocarray(env, envsize, sizeof(char *)); 2316 *envsizep = envsize; 2317 } 2318 /* Need to set the NULL pointer at end of array beyond the new slot. */ 2319 env[i + 1] = NULL; 2320 } 2321 2322 /* Allocate space and format the variable in the appropriate slot. */ 2323 /* XXX xasprintf */ 2324 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); 2325 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); 2326 } 2327 2328 /* 2329 * Check and optionally lowercase a domain name, also removes trailing '.' 2330 * Returns 1 on success and 0 on failure, storing an error message in errstr. 2331 */ 2332 int 2333 valid_domain(char *name, int makelower, const char **errstr) 2334 { 2335 size_t i, l = strlen(name); 2336 u_char c, last = '\0'; 2337 static char errbuf[256]; 2338 2339 if (l == 0) { 2340 strlcpy(errbuf, "empty domain name", sizeof(errbuf)); 2341 goto bad; 2342 } 2343 if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) { 2344 snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" " 2345 "starts with invalid character", name); 2346 goto bad; 2347 } 2348 for (i = 0; i < l; i++) { 2349 c = tolower((u_char)name[i]); 2350 if (makelower) 2351 name[i] = (char)c; 2352 if (last == '.' && c == '.') { 2353 snprintf(errbuf, sizeof(errbuf), "domain name " 2354 "\"%.100s\" contains consecutive separators", name); 2355 goto bad; 2356 } 2357 if (c != '.' && c != '-' && !isalnum(c) && 2358 c != '_') /* technically invalid, but common */ { 2359 snprintf(errbuf, sizeof(errbuf), "domain name " 2360 "\"%.100s\" contains invalid characters", name); 2361 goto bad; 2362 } 2363 last = c; 2364 } 2365 if (name[l - 1] == '.') 2366 name[l - 1] = '\0'; 2367 if (errstr != NULL) 2368 *errstr = NULL; 2369 return 1; 2370 bad: 2371 if (errstr != NULL) 2372 *errstr = errbuf; 2373 return 0; 2374 } 2375 2376 /* 2377 * Verify that a environment variable name (not including initial '$') is 2378 * valid; consisting of one or more alphanumeric or underscore characters only. 2379 * Returns 1 on valid, 0 otherwise. 2380 */ 2381 int 2382 valid_env_name(const char *name) 2383 { 2384 const char *cp; 2385 2386 if (name[0] == '\0') 2387 return 0; 2388 for (cp = name; *cp != '\0'; cp++) { 2389 if (!isalnum((u_char)*cp) && *cp != '_') 2390 return 0; 2391 } 2392 return 1; 2393 } 2394 2395 const char * 2396 atoi_err(const char *nptr, int *val) 2397 { 2398 const char *errstr = NULL; 2399 long long num; 2400 2401 if (nptr == NULL || *nptr == '\0') 2402 return "missing"; 2403 num = strtonum(nptr, 0, INT_MAX, &errstr); 2404 if (errstr == NULL) 2405 *val = (int)num; 2406 return errstr; 2407 } 2408 2409 int 2410 parse_absolute_time(const char *s, uint64_t *tp) 2411 { 2412 struct tm tm; 2413 time_t tt; 2414 char buf[32], *fmt; 2415 const char *cp; 2416 size_t l; 2417 int is_utc = 0; 2418 2419 *tp = 0; 2420 2421 l = strlen(s); 2422 if (l > 1 && strcasecmp(s + l - 1, "Z") == 0) { 2423 is_utc = 1; 2424 l--; 2425 } else if (l > 3 && strcasecmp(s + l - 3, "UTC") == 0) { 2426 is_utc = 1; 2427 l -= 3; 2428 } 2429 /* 2430 * POSIX strptime says "The application shall ensure that there 2431 * is white-space or other non-alphanumeric characters between 2432 * any two conversion specifications" so arrange things this way. 2433 */ 2434 switch (l) { 2435 case 8: /* YYYYMMDD */ 2436 fmt = "%Y-%m-%d"; 2437 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 2438 break; 2439 case 12: /* YYYYMMDDHHMM */ 2440 fmt = "%Y-%m-%dT%H:%M"; 2441 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s", 2442 s, s + 4, s + 6, s + 8, s + 10); 2443 break; 2444 case 14: /* YYYYMMDDHHMMSS */ 2445 fmt = "%Y-%m-%dT%H:%M:%S"; 2446 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 2447 s, s + 4, s + 6, s + 8, s + 10, s + 12); 2448 break; 2449 default: 2450 return SSH_ERR_INVALID_FORMAT; 2451 } 2452 2453 memset(&tm, 0, sizeof(tm)); 2454 if ((cp = strptime(buf, fmt, &tm)) == NULL || *cp != '\0') 2455 return SSH_ERR_INVALID_FORMAT; 2456 if (is_utc) { 2457 if ((tt = timegm(&tm)) < 0) 2458 return SSH_ERR_INVALID_FORMAT; 2459 } else { 2460 if ((tt = mktime(&tm)) < 0) 2461 return SSH_ERR_INVALID_FORMAT; 2462 } 2463 /* success */ 2464 *tp = (uint64_t)tt; 2465 return 0; 2466 } 2467 2468 void 2469 format_absolute_time(uint64_t t, char *buf, size_t len) 2470 { 2471 time_t tt = t > SSH_TIME_T_MAX ? SSH_TIME_T_MAX : t; 2472 struct tm tm; 2473 2474 localtime_r(&tt, &tm); 2475 strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm); 2476 } 2477 2478 /* check if path is absolute */ 2479 int 2480 path_absolute(const char *path) 2481 { 2482 return (*path == '/') ? 1 : 0; 2483 } 2484 2485 void 2486 skip_space(char **cpp) 2487 { 2488 char *cp; 2489 2490 for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++) 2491 ; 2492 *cpp = cp; 2493 } 2494 2495 /* authorized_key-style options parsing helpers */ 2496 2497 /* 2498 * Match flag 'opt' in *optsp, and if allow_negate is set then also match 2499 * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0 2500 * if negated option matches. 2501 * If the option or negated option matches, then *optsp is updated to 2502 * point to the first character after the option. 2503 */ 2504 int 2505 opt_flag(const char *opt, int allow_negate, const char **optsp) 2506 { 2507 size_t opt_len = strlen(opt); 2508 const char *opts = *optsp; 2509 int negate = 0; 2510 2511 if (allow_negate && strncasecmp(opts, "no-", 3) == 0) { 2512 opts += 3; 2513 negate = 1; 2514 } 2515 if (strncasecmp(opts, opt, opt_len) == 0) { 2516 *optsp = opts + opt_len; 2517 return negate ? 0 : 1; 2518 } 2519 return -1; 2520 } 2521 2522 char * 2523 opt_dequote(const char **sp, const char **errstrp) 2524 { 2525 const char *s = *sp; 2526 char *ret; 2527 size_t i; 2528 2529 *errstrp = NULL; 2530 if (*s != '"') { 2531 *errstrp = "missing start quote"; 2532 return NULL; 2533 } 2534 s++; 2535 if ((ret = malloc(strlen((s)) + 1)) == NULL) { 2536 *errstrp = "memory allocation failed"; 2537 return NULL; 2538 } 2539 for (i = 0; *s != '\0' && *s != '"';) { 2540 if (s[0] == '\\' && s[1] == '"') 2541 s++; 2542 ret[i++] = *s++; 2543 } 2544 if (*s == '\0') { 2545 *errstrp = "missing end quote"; 2546 free(ret); 2547 return NULL; 2548 } 2549 ret[i] = '\0'; 2550 s++; 2551 *sp = s; 2552 return ret; 2553 } 2554 2555 int 2556 opt_match(const char **opts, const char *term) 2557 { 2558 if (strncasecmp((*opts), term, strlen(term)) == 0 && 2559 (*opts)[strlen(term)] == '=') { 2560 *opts += strlen(term) + 1; 2561 return 1; 2562 } 2563 return 0; 2564 } 2565 2566 void 2567 opt_array_append2(const char *file, const int line, const char *directive, 2568 char ***array, int **iarray, u_int *lp, const char *s, int i) 2569 { 2570 2571 if (*lp >= INT_MAX) 2572 fatal("%s line %d: Too many %s entries", file, line, directive); 2573 2574 if (iarray != NULL) { 2575 *iarray = xrecallocarray(*iarray, *lp, *lp + 1, 2576 sizeof(**iarray)); 2577 (*iarray)[*lp] = i; 2578 } 2579 2580 *array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array)); 2581 (*array)[*lp] = xstrdup(s); 2582 (*lp)++; 2583 } 2584 2585 void 2586 opt_array_append(const char *file, const int line, const char *directive, 2587 char ***array, u_int *lp, const char *s) 2588 { 2589 opt_array_append2(file, line, directive, array, NULL, lp, s, 0); 2590 } 2591 2592 sshsig_t 2593 ssh_signal(int signum, sshsig_t handler) 2594 { 2595 struct sigaction sa, osa; 2596 2597 /* mask all other signals while in handler */ 2598 memset(&sa, 0, sizeof(sa)); 2599 sa.sa_handler = handler; 2600 sigfillset(&sa.sa_mask); 2601 #if defined(SA_RESTART) && !defined(NO_SA_RESTART) 2602 if (signum != SIGALRM) 2603 sa.sa_flags = SA_RESTART; 2604 #endif 2605 if (sigaction(signum, &sa, &osa) == -1) { 2606 debug3("sigaction(%s): %s", strsignal(signum), strerror(errno)); 2607 return SIG_ERR; 2608 } 2609 return osa.sa_handler; 2610 } 2611 2612 int 2613 stdfd_devnull(int do_stdin, int do_stdout, int do_stderr) 2614 { 2615 int devnull, ret = 0; 2616 2617 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) { 2618 error_f("open %s: %s", _PATH_DEVNULL, 2619 strerror(errno)); 2620 return -1; 2621 } 2622 if ((do_stdin && dup2(devnull, STDIN_FILENO) == -1) || 2623 (do_stdout && dup2(devnull, STDOUT_FILENO) == -1) || 2624 (do_stderr && dup2(devnull, STDERR_FILENO) == -1)) { 2625 error_f("dup2: %s", strerror(errno)); 2626 ret = -1; 2627 } 2628 if (devnull > STDERR_FILENO) 2629 close(devnull); 2630 return ret; 2631 } 2632 2633 /* 2634 * Runs command in a subprocess with a minimal environment. 2635 * Returns pid on success, 0 on failure. 2636 * The child stdout and stderr maybe captured, left attached or sent to 2637 * /dev/null depending on the contents of flags. 2638 * "tag" is prepended to log messages. 2639 * NB. "command" is only used for logging; the actual command executed is 2640 * av[0]. 2641 */ 2642 pid_t 2643 subprocess(const char *tag, const char *command, 2644 int ac, char **av, FILE **child, u_int flags, 2645 struct passwd *pw, privdrop_fn *drop_privs, privrestore_fn *restore_privs) 2646 { 2647 FILE *f = NULL; 2648 struct stat st; 2649 int fd, devnull, p[2], i; 2650 pid_t pid; 2651 char *cp, errmsg[512]; 2652 u_int nenv = 0; 2653 char **env = NULL; 2654 2655 /* If dropping privs, then must specify user and restore function */ 2656 if (drop_privs != NULL && (pw == NULL || restore_privs == NULL)) { 2657 error("%s: inconsistent arguments", tag); /* XXX fatal? */ 2658 return 0; 2659 } 2660 if (pw == NULL && (pw = getpwuid(getuid())) == NULL) { 2661 error("%s: no user for current uid", tag); 2662 return 0; 2663 } 2664 if (child != NULL) 2665 *child = NULL; 2666 2667 debug3_f("%s command \"%s\" running as %s (flags 0x%x)", 2668 tag, command, pw->pw_name, flags); 2669 2670 /* Check consistency */ 2671 if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 && 2672 (flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0) { 2673 error_f("inconsistent flags"); 2674 return 0; 2675 } 2676 if (((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0) != (child == NULL)) { 2677 error_f("inconsistent flags/output"); 2678 return 0; 2679 } 2680 2681 /* 2682 * If executing an explicit binary, then verify the it exists 2683 * and appears safe-ish to execute 2684 */ 2685 if (!path_absolute(av[0])) { 2686 error("%s path is not absolute", tag); 2687 return 0; 2688 } 2689 if (drop_privs != NULL) 2690 drop_privs(pw); 2691 if (stat(av[0], &st) == -1) { 2692 error("Could not stat %s \"%s\": %s", tag, 2693 av[0], strerror(errno)); 2694 goto restore_return; 2695 } 2696 if ((flags & SSH_SUBPROCESS_UNSAFE_PATH) == 0 && 2697 safe_path(av[0], &st, NULL, 0, errmsg, sizeof(errmsg)) != 0) { 2698 error("Unsafe %s \"%s\": %s", tag, av[0], errmsg); 2699 goto restore_return; 2700 } 2701 /* Prepare to keep the child's stdout if requested */ 2702 if (pipe(p) == -1) { 2703 error("%s: pipe: %s", tag, strerror(errno)); 2704 restore_return: 2705 if (restore_privs != NULL) 2706 restore_privs(); 2707 return 0; 2708 } 2709 if (restore_privs != NULL) 2710 restore_privs(); 2711 2712 switch ((pid = fork())) { 2713 case -1: /* error */ 2714 error("%s: fork: %s", tag, strerror(errno)); 2715 close(p[0]); 2716 close(p[1]); 2717 return 0; 2718 case 0: /* child */ 2719 /* Prepare a minimal environment for the child. */ 2720 if ((flags & SSH_SUBPROCESS_PRESERVE_ENV) == 0) { 2721 nenv = 5; 2722 env = xcalloc(sizeof(*env), nenv); 2723 child_set_env(&env, &nenv, "PATH", _PATH_STDPATH); 2724 child_set_env(&env, &nenv, "USER", pw->pw_name); 2725 child_set_env(&env, &nenv, "LOGNAME", pw->pw_name); 2726 child_set_env(&env, &nenv, "HOME", pw->pw_dir); 2727 if ((cp = getenv("LANG")) != NULL) 2728 child_set_env(&env, &nenv, "LANG", cp); 2729 } 2730 2731 for (i = 1; i < NSIG; i++) 2732 ssh_signal(i, SIG_DFL); 2733 2734 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) { 2735 error("%s: open %s: %s", tag, _PATH_DEVNULL, 2736 strerror(errno)); 2737 _exit(1); 2738 } 2739 if (dup2(devnull, STDIN_FILENO) == -1) { 2740 error("%s: dup2: %s", tag, strerror(errno)); 2741 _exit(1); 2742 } 2743 2744 /* Set up stdout as requested; leave stderr in place for now. */ 2745 fd = -1; 2746 if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0) 2747 fd = p[1]; 2748 else if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0) 2749 fd = devnull; 2750 if (fd != -1 && dup2(fd, STDOUT_FILENO) == -1) { 2751 error("%s: dup2: %s", tag, strerror(errno)); 2752 _exit(1); 2753 } 2754 closefrom(STDERR_FILENO + 1); 2755 2756 if (geteuid() == 0 && 2757 initgroups(pw->pw_name, pw->pw_gid) == -1) { 2758 error("%s: initgroups(%s, %u): %s", tag, 2759 pw->pw_name, (u_int)pw->pw_gid, strerror(errno)); 2760 _exit(1); 2761 } 2762 if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1) { 2763 error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid, 2764 strerror(errno)); 2765 _exit(1); 2766 } 2767 if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1) { 2768 error("%s: setresuid %u: %s", tag, (u_int)pw->pw_uid, 2769 strerror(errno)); 2770 _exit(1); 2771 } 2772 /* stdin is pointed to /dev/null at this point */ 2773 if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 && 2774 dup2(STDIN_FILENO, STDERR_FILENO) == -1) { 2775 error("%s: dup2: %s", tag, strerror(errno)); 2776 _exit(1); 2777 } 2778 if (env != NULL) 2779 execve(av[0], av, env); 2780 else 2781 execv(av[0], av); 2782 error("%s %s \"%s\": %s", tag, env == NULL ? "execv" : "execve", 2783 command, strerror(errno)); 2784 _exit(127); 2785 default: /* parent */ 2786 break; 2787 } 2788 2789 close(p[1]); 2790 if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0) 2791 close(p[0]); 2792 else if ((f = fdopen(p[0], "r")) == NULL) { 2793 error("%s: fdopen: %s", tag, strerror(errno)); 2794 close(p[0]); 2795 /* Don't leave zombie child */ 2796 kill(pid, SIGTERM); 2797 while (waitpid(pid, NULL, 0) == -1 && errno == EINTR) 2798 ; 2799 return 0; 2800 } 2801 /* Success */ 2802 debug3_f("%s pid %ld", tag, (long)pid); 2803 if (child != NULL) 2804 *child = f; 2805 return pid; 2806 } 2807 2808 const char * 2809 lookup_env_in_list(const char *env, char * const *envs, size_t nenvs) 2810 { 2811 size_t i, envlen; 2812 2813 envlen = strlen(env); 2814 for (i = 0; i < nenvs; i++) { 2815 if (strncmp(envs[i], env, envlen) == 0 && 2816 envs[i][envlen] == '=') { 2817 return envs[i] + envlen + 1; 2818 } 2819 } 2820 return NULL; 2821 } 2822 2823 const char * 2824 lookup_setenv_in_list(const char *env, char * const *envs, size_t nenvs) 2825 { 2826 char *name, *cp; 2827 const char *ret; 2828 2829 name = xstrdup(env); 2830 if ((cp = strchr(name, '=')) == NULL) { 2831 free(name); 2832 return NULL; /* not env=val */ 2833 } 2834 *cp = '\0'; 2835 ret = lookup_env_in_list(name, envs, nenvs); 2836 free(name); 2837 return ret; 2838 } 2839 2840 /* 2841 * Helpers for managing poll(2)/ppoll(2) timeouts 2842 * Will remember the earliest deadline and return it for use in poll/ppoll. 2843 */ 2844 2845 /* Initialise a poll/ppoll timeout with an indefinite deadline */ 2846 void 2847 ptimeout_init(struct timespec *pt) 2848 { 2849 /* 2850 * Deliberately invalid for ppoll(2). 2851 * Will be converted to NULL in ptimeout_get_tspec() later. 2852 */ 2853 pt->tv_sec = -1; 2854 pt->tv_nsec = 0; 2855 } 2856 2857 /* Specify a poll/ppoll deadline of at most 'sec' seconds */ 2858 void 2859 ptimeout_deadline_sec(struct timespec *pt, long sec) 2860 { 2861 if (pt->tv_sec == -1 || pt->tv_sec >= sec) { 2862 pt->tv_sec = sec; 2863 pt->tv_nsec = 0; 2864 } 2865 } 2866 2867 /* Specify a poll/ppoll deadline of at most 'p' (timespec) */ 2868 static void 2869 ptimeout_deadline_tsp(struct timespec *pt, struct timespec *p) 2870 { 2871 if (pt->tv_sec == -1 || timespeccmp(pt, p, >=)) 2872 *pt = *p; 2873 } 2874 2875 /* Specify a poll/ppoll deadline of at most 'ms' milliseconds */ 2876 void 2877 ptimeout_deadline_ms(struct timespec *pt, long ms) 2878 { 2879 struct timespec p; 2880 2881 p.tv_sec = ms / 1000; 2882 p.tv_nsec = (ms % 1000) * 1000000; 2883 ptimeout_deadline_tsp(pt, &p); 2884 } 2885 2886 /* Specify a poll/ppoll deadline at wall clock monotime 'when' */ 2887 void 2888 ptimeout_deadline_monotime(struct timespec *pt, time_t when) 2889 { 2890 struct timespec now, t; 2891 2892 t.tv_sec = when; 2893 t.tv_nsec = 0; 2894 monotime_ts(&now); 2895 2896 if (timespeccmp(&now, &t, >=)) 2897 ptimeout_deadline_sec(pt, 0); 2898 else { 2899 timespecsub(&t, &now, &t); 2900 ptimeout_deadline_tsp(pt, &t); 2901 } 2902 } 2903 2904 /* Get a poll(2) timeout value in milliseconds */ 2905 int 2906 ptimeout_get_ms(struct timespec *pt) 2907 { 2908 if (pt->tv_sec == -1) 2909 return -1; 2910 if (pt->tv_sec >= (INT_MAX - (pt->tv_nsec / 1000000)) / 1000) 2911 return INT_MAX; 2912 return (pt->tv_sec * 1000) + (pt->tv_nsec / 1000000); 2913 } 2914 2915 /* Get a ppoll(2) timeout value as a timespec pointer */ 2916 struct timespec * 2917 ptimeout_get_tsp(struct timespec *pt) 2918 { 2919 return pt->tv_sec == -1 ? NULL : pt; 2920 } 2921 2922 /* Returns non-zero if a timeout has been set (i.e. is not indefinite) */ 2923 int 2924 ptimeout_isset(struct timespec *pt) 2925 { 2926 return pt->tv_sec != -1; 2927 } 2928 2929 /* 2930 * Returns zero if the library at 'path' contains symbol 's', nonzero 2931 * otherwise. 2932 */ 2933 int 2934 lib_contains_symbol(const char *path, const char *s) 2935 { 2936 #ifdef HAVE_NLIST_H 2937 struct nlist nl[2]; 2938 int ret = -1, r; 2939 2940 memset(nl, 0, sizeof(nl)); 2941 nl[0].n_name = xstrdup(s); 2942 nl[1].n_name = NULL; 2943 if ((r = nlist(path, nl)) == -1) { 2944 error_f("nlist failed for %s", path); 2945 goto out; 2946 } 2947 if (r != 0 || nl[0].n_value == 0 || nl[0].n_type == 0) { 2948 error_f("library %s does not contain symbol %s", path, s); 2949 goto out; 2950 } 2951 /* success */ 2952 ret = 0; 2953 out: 2954 free(nl[0].n_name); 2955 return ret; 2956 #else /* HAVE_NLIST_H */ 2957 int fd, ret = -1; 2958 struct stat st; 2959 void *m = NULL; 2960 size_t sz = 0; 2961 2962 memset(&st, 0, sizeof(st)); 2963 if ((fd = open(path, O_RDONLY)) < 0) { 2964 error_f("open %s: %s", path, strerror(errno)); 2965 return -1; 2966 } 2967 if (fstat(fd, &st) != 0) { 2968 error_f("fstat %s: %s", path, strerror(errno)); 2969 goto out; 2970 } 2971 if (!S_ISREG(st.st_mode)) { 2972 error_f("%s is not a regular file", path); 2973 goto out; 2974 } 2975 if (st.st_size < 0 || 2976 (size_t)st.st_size < strlen(s) || 2977 st.st_size >= INT_MAX/2) { 2978 error_f("%s bad size %lld", path, (long long)st.st_size); 2979 goto out; 2980 } 2981 sz = (size_t)st.st_size; 2982 if ((m = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, fd, 0)) == MAP_FAILED || 2983 m == NULL) { 2984 error_f("mmap %s: %s", path, strerror(errno)); 2985 goto out; 2986 } 2987 if (memmem(m, sz, s, strlen(s)) == NULL) { 2988 error_f("%s does not contain expected string %s", path, s); 2989 goto out; 2990 } 2991 /* success */ 2992 ret = 0; 2993 out: 2994 if (m != NULL && m != MAP_FAILED) 2995 munmap(m, sz); 2996 close(fd); 2997 return ret; 2998 #endif /* HAVE_NLIST_H */ 2999 } 3000