1 /*- 2 * Copyright (c) 1998-2016 Dag-Erling Smørgrav 3 * Copyright (c) 2013 Michael Gmelin <freebsd@grem.de> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer 11 * in this position and unchanged. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission 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 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/socket.h> 35 #include <sys/time.h> 36 #include <sys/uio.h> 37 38 #include <netinet/in.h> 39 40 #include <ctype.h> 41 #include <errno.h> 42 #include <fcntl.h> 43 #include <netdb.h> 44 #include <poll.h> 45 #include <pwd.h> 46 #include <stdarg.h> 47 #include <stdlib.h> 48 #include <stdio.h> 49 #include <string.h> 50 #include <unistd.h> 51 52 #ifdef WITH_SSL 53 #include <openssl/x509v3.h> 54 #endif 55 56 #include "fetch.h" 57 #include "common.h" 58 59 60 /*** Local data **************************************************************/ 61 62 /* 63 * Error messages for resolver errors 64 */ 65 static struct fetcherr netdb_errlist[] = { 66 #ifdef EAI_NODATA 67 { EAI_NODATA, FETCH_RESOLV, "Host not found" }, 68 #endif 69 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 70 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 71 { EAI_NONAME, FETCH_RESOLV, "No address record" }, 72 { -1, FETCH_UNKNOWN, "Unknown resolver error" } 73 }; 74 75 /* End-of-Line */ 76 static const char ENDL[2] = "\r\n"; 77 78 79 /*** Error-reporting functions ***********************************************/ 80 81 /* 82 * Map error code to string 83 */ 84 static struct fetcherr * 85 fetch_finderr(struct fetcherr *p, int e) 86 { 87 while (p->num != -1 && p->num != e) 88 p++; 89 return (p); 90 } 91 92 /* 93 * Set error code 94 */ 95 void 96 fetch_seterr(struct fetcherr *p, int e) 97 { 98 p = fetch_finderr(p, e); 99 fetchLastErrCode = p->cat; 100 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 101 } 102 103 /* 104 * Set error code according to errno 105 */ 106 void 107 fetch_syserr(void) 108 { 109 switch (errno) { 110 case 0: 111 fetchLastErrCode = FETCH_OK; 112 break; 113 case EPERM: 114 case EACCES: 115 case EROFS: 116 case EAUTH: 117 case ENEEDAUTH: 118 fetchLastErrCode = FETCH_AUTH; 119 break; 120 case ENOENT: 121 case EISDIR: /* XXX */ 122 fetchLastErrCode = FETCH_UNAVAIL; 123 break; 124 case ENOMEM: 125 fetchLastErrCode = FETCH_MEMORY; 126 break; 127 case EBUSY: 128 case EAGAIN: 129 fetchLastErrCode = FETCH_TEMP; 130 break; 131 case EEXIST: 132 fetchLastErrCode = FETCH_EXISTS; 133 break; 134 case ENOSPC: 135 fetchLastErrCode = FETCH_FULL; 136 break; 137 case EADDRINUSE: 138 case EADDRNOTAVAIL: 139 case ENETDOWN: 140 case ENETUNREACH: 141 case ENETRESET: 142 case EHOSTUNREACH: 143 fetchLastErrCode = FETCH_NETWORK; 144 break; 145 case ECONNABORTED: 146 case ECONNRESET: 147 fetchLastErrCode = FETCH_ABORT; 148 break; 149 case ETIMEDOUT: 150 fetchLastErrCode = FETCH_TIMEOUT; 151 break; 152 case ECONNREFUSED: 153 case EHOSTDOWN: 154 fetchLastErrCode = FETCH_DOWN; 155 break; 156 default: 157 fetchLastErrCode = FETCH_UNKNOWN; 158 } 159 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); 160 } 161 162 163 /* 164 * Emit status message 165 */ 166 void 167 fetch_info(const char *fmt, ...) 168 { 169 va_list ap; 170 171 va_start(ap, fmt); 172 vfprintf(stderr, fmt, ap); 173 va_end(ap); 174 fputc('\n', stderr); 175 } 176 177 178 /*** Network-related utility functions ***************************************/ 179 180 /* 181 * Return the default port for a scheme 182 */ 183 int 184 fetch_default_port(const char *scheme) 185 { 186 struct servent *se; 187 188 if ((se = getservbyname(scheme, "tcp")) != NULL) 189 return (ntohs(se->s_port)); 190 if (strcasecmp(scheme, SCHEME_FTP) == 0) 191 return (FTP_DEFAULT_PORT); 192 if (strcasecmp(scheme, SCHEME_HTTP) == 0) 193 return (HTTP_DEFAULT_PORT); 194 return (0); 195 } 196 197 /* 198 * Return the default proxy port for a scheme 199 */ 200 int 201 fetch_default_proxy_port(const char *scheme) 202 { 203 if (strcasecmp(scheme, SCHEME_FTP) == 0) 204 return (FTP_DEFAULT_PROXY_PORT); 205 if (strcasecmp(scheme, SCHEME_HTTP) == 0) 206 return (HTTP_DEFAULT_PROXY_PORT); 207 return (0); 208 } 209 210 211 /* 212 * Create a connection for an existing descriptor. 213 */ 214 conn_t * 215 fetch_reopen(int sd) 216 { 217 conn_t *conn; 218 int opt = 1; 219 220 /* allocate and fill connection structure */ 221 if ((conn = calloc(1, sizeof(*conn))) == NULL) 222 return (NULL); 223 fcntl(sd, F_SETFD, FD_CLOEXEC); 224 setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof opt); 225 conn->sd = sd; 226 ++conn->ref; 227 return (conn); 228 } 229 230 231 /* 232 * Bump a connection's reference count. 233 */ 234 conn_t * 235 fetch_ref(conn_t *conn) 236 { 237 238 ++conn->ref; 239 return (conn); 240 } 241 242 243 /* 244 * Resolve an address 245 */ 246 struct addrinfo * 247 fetch_resolve(const char *addr, int port, int af) 248 { 249 char hbuf[256], sbuf[8]; 250 struct addrinfo hints, *res; 251 const char *sep, *host, *service; 252 int err, len; 253 254 /* split address if necessary */ 255 err = EAI_SYSTEM; 256 if ((sep = strchr(addr, ':')) != NULL) { 257 len = snprintf(hbuf, sizeof(hbuf), 258 "%.*s", (int)(sep - addr), addr); 259 if (len < 0) 260 return (NULL); 261 if (len >= (int)sizeof(hbuf)) { 262 errno = ENAMETOOLONG; 263 fetch_syserr(); 264 return (NULL); 265 } 266 host = hbuf; 267 service = sep + 1; 268 } else if (port != 0) { 269 if (port < 1 || port > 65535) { 270 errno = EINVAL; 271 fetch_syserr(); 272 return (NULL); 273 } 274 if (snprintf(sbuf, sizeof(sbuf), "%d", port) < 0) { 275 fetch_syserr(); 276 return (NULL); 277 } 278 host = addr; 279 service = sbuf; 280 } else { 281 host = addr; 282 service = NULL; 283 } 284 285 /* resolve */ 286 memset(&hints, 0, sizeof(hints)); 287 hints.ai_family = af; 288 hints.ai_socktype = SOCK_STREAM; 289 hints.ai_flags = AI_ADDRCONFIG; 290 if ((err = getaddrinfo(host, service, &hints, &res)) != 0) { 291 netdb_seterr(err); 292 return (NULL); 293 } 294 return (res); 295 } 296 297 298 299 /* 300 * Bind a socket to a specific local address 301 */ 302 int 303 fetch_bind(int sd, int af, const char *addr) 304 { 305 struct addrinfo *cliai, *ai; 306 int err; 307 308 if ((cliai = fetch_resolve(addr, 0, af)) == NULL) 309 return (-1); 310 for (ai = cliai; ai != NULL; ai = ai->ai_next) 311 if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0) 312 break; 313 if (err != 0) 314 fetch_syserr(); 315 freeaddrinfo(cliai); 316 return (err == 0 ? 0 : -1); 317 } 318 319 320 /* 321 * Establish a TCP connection to the specified port on the specified host. 322 */ 323 conn_t * 324 fetch_connect(const char *host, int port, int af, int verbose) 325 { 326 struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai; 327 const char *bindaddr; 328 conn_t *conn = NULL; 329 int err = 0, sd = -1; 330 331 DEBUG(fprintf(stderr, "---> %s:%d\n", host, port)); 332 333 /* resolve server address */ 334 if (verbose) 335 fetch_info("resolving server address: %s:%d", host, port); 336 if ((sais = fetch_resolve(host, port, af)) == NULL) 337 goto fail; 338 fetch_info("resolved"); 339 340 /* resolve client address */ 341 bindaddr = getenv("FETCH_BIND_ADDRESS"); 342 if (bindaddr != NULL && *bindaddr != '\0') { 343 if (verbose) 344 fetch_info("resolving client address: %s", bindaddr); 345 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL) 346 goto fail; 347 } 348 349 /* try each server address in turn */ 350 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) { 351 /* open socket */ 352 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0) 353 goto syserr; 354 /* attempt to bind to client address */ 355 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) { 356 if (cai->ai_family != sai->ai_family) 357 continue; 358 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0) 359 break; 360 } 361 if (err != 0) { 362 if (verbose) 363 fetch_info("failed to bind to %s", bindaddr); 364 goto syserr; 365 } 366 /* attempt to connect to server address */ 367 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0) 368 break; 369 /* clean up before next attempt */ 370 close(sd); 371 sd = -1; 372 } 373 if (err != 0) { 374 if (verbose) 375 fetch_info("failed to connect to %s:%s", host, port); 376 goto syserr; 377 } 378 379 if ((conn = fetch_reopen(sd)) == NULL) 380 goto syserr; 381 if (cais != NULL) 382 freeaddrinfo(cais); 383 if (sais != NULL) 384 freeaddrinfo(sais); 385 return (conn); 386 syserr: 387 fetch_syserr(); 388 goto fail; 389 fail: 390 if (sd >= 0) 391 close(sd); 392 if (cais != NULL) 393 freeaddrinfo(cais); 394 if (sais != NULL) 395 freeaddrinfo(sais); 396 return (NULL); 397 } 398 399 #ifdef WITH_SSL 400 /* 401 * Convert characters A-Z to lowercase (intentionally avoid any locale 402 * specific conversions). 403 */ 404 static char 405 fetch_ssl_tolower(char in) 406 { 407 if (in >= 'A' && in <= 'Z') 408 return (in + 32); 409 else 410 return (in); 411 } 412 413 /* 414 * isalpha implementation that intentionally avoids any locale specific 415 * conversions. 416 */ 417 static int 418 fetch_ssl_isalpha(char in) 419 { 420 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 421 } 422 423 /* 424 * Check if passed hostnames a and b are equal. 425 */ 426 static int 427 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 428 size_t blen) 429 { 430 size_t i; 431 432 if (alen != blen) 433 return (0); 434 for (i = 0; i < alen; ++i) { 435 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 436 return (0); 437 } 438 return (1); 439 } 440 441 /* 442 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 443 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 444 * numeric characters. Double hyphens (like they're found in IDN a-labels 445 * 'xn--') are not allowed. Empty labels are invalid. 446 */ 447 static int 448 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 449 { 450 size_t i; 451 452 if (!len || l[0] == '-' || l[len-1] == '-') 453 return (0); 454 for (i = 0; i < len; ++i) { 455 if (!isdigit(l[i]) && 456 !fetch_ssl_isalpha(l[i]) && 457 !(l[i] == '*' && wcok) && 458 !(l[i] == '-' && l[i - 1] != '-')) 459 return (0); 460 } 461 return (1); 462 } 463 464 /* 465 * Check if host name consists only of numbers. This might indicate an IP 466 * address, which is not a good idea for CN wildcard comparison. 467 */ 468 static int 469 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 470 { 471 size_t i; 472 473 for (i = 0; i < len; ++i) { 474 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 475 hostname[i] == '.')) 476 return (0); 477 } 478 return (1); 479 } 480 481 /* 482 * Check if the host name h passed matches the pattern passed in m which 483 * is usually part of subjectAltName or CN of a certificate presented to 484 * the client. This includes wildcard matching. The algorithm is based on 485 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 486 */ 487 static int 488 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 489 size_t mlen) 490 { 491 int delta, hdotidx, mdot1idx, wcidx; 492 const char *hdot, *mdot1, *mdot2; 493 const char *wc; /* wildcard */ 494 495 if (!(h && *h && m && *m)) 496 return (0); 497 if ((wc = strnstr(m, "*", mlen)) == NULL) 498 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 499 wcidx = wc - m; 500 /* hostname should not be just dots and numbers */ 501 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 502 return (0); 503 /* only one wildcard allowed in pattern */ 504 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 505 return (0); 506 /* 507 * there must be at least two more domain labels and 508 * wildcard has to be in the leftmost label (RFC6125) 509 */ 510 mdot1 = strnstr(m, ".", mlen); 511 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 512 return (0); 513 mdot1idx = mdot1 - m; 514 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 515 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 516 return (0); 517 /* hostname must contain a dot and not be the 1st char */ 518 hdot = strnstr(h, ".", hlen); 519 if (hdot == NULL || hdot == h) 520 return (0); 521 hdotidx = hdot - h; 522 /* 523 * host part of hostname must be at least as long as 524 * pattern it's supposed to match 525 */ 526 if (hdotidx < mdot1idx) 527 return (0); 528 /* 529 * don't allow wildcards in non-traditional domain names 530 * (IDN, A-label, U-label...) 531 */ 532 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 533 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 534 return (0); 535 /* match domain part (part after first dot) */ 536 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 537 mlen - mdot1idx)) 538 return (0); 539 /* match part left of wildcard */ 540 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 541 return (0); 542 /* match part right of wildcard */ 543 delta = mdot1idx - wcidx - 1; 544 if (!fetch_ssl_hname_equal(hdot - delta, delta, 545 mdot1 - delta, delta)) 546 return (0); 547 /* all tests succeeded, it's a match */ 548 return (1); 549 } 550 551 /* 552 * Get numeric host address info - returns NULL if host was not an IP 553 * address. The caller is responsible for deallocation using 554 * freeaddrinfo(3). 555 */ 556 static struct addrinfo * 557 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 558 { 559 struct addrinfo hints, *res; 560 char *host; 561 562 host = (char *)malloc(len + 1); 563 memcpy(host, hostname, len); 564 host[len] = '\0'; 565 memset(&hints, 0, sizeof(hints)); 566 hints.ai_family = PF_UNSPEC; 567 hints.ai_socktype = SOCK_STREAM; 568 hints.ai_protocol = 0; 569 hints.ai_flags = AI_NUMERICHOST; 570 /* port is not relevant for this purpose */ 571 if (getaddrinfo(host, "443", &hints, &res) != 0) 572 res = NULL; 573 free(host); 574 return res; 575 } 576 577 /* 578 * Compare ip address in addrinfo with address passes. 579 */ 580 static int 581 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 582 size_t rhostlen) 583 { 584 const void *left; 585 586 if (lhost->ai_family == AF_INET && rhostlen == 4) { 587 left = (void *)&((struct sockaddr_in*)(void *) 588 lhost->ai_addr)->sin_addr.s_addr; 589 #ifdef INET6 590 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 591 left = (void *)&((struct sockaddr_in6 *)(void *) 592 lhost->ai_addr)->sin6_addr; 593 #endif 594 } else 595 return (0); 596 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 597 } 598 599 /* 600 * Compare ip address in addrinfo with host passed. If host is not an IP 601 * address, comparison will fail. 602 */ 603 static int 604 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 605 size_t rlen) 606 { 607 struct addrinfo *raddr; 608 int ret; 609 char *rip; 610 611 ret = 0; 612 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 613 return 0; /* not a numeric host */ 614 615 if (laddr->ai_family == raddr->ai_family) { 616 if (laddr->ai_family == AF_INET) { 617 rip = (char *)&((struct sockaddr_in *)(void *) 618 raddr->ai_addr)->sin_addr.s_addr; 619 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 620 #ifdef INET6 621 } else if (laddr->ai_family == AF_INET6) { 622 rip = (char *)&((struct sockaddr_in6 *)(void *) 623 raddr->ai_addr)->sin6_addr; 624 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 625 #endif 626 } 627 628 } 629 freeaddrinfo(raddr); 630 return (ret); 631 } 632 633 /* 634 * Verify server certificate by subjectAltName. 635 */ 636 static int 637 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 638 const char *host, struct addrinfo *ip) 639 { 640 const GENERAL_NAME *name; 641 size_t nslen; 642 int i; 643 const char *ns; 644 645 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 646 #if OPENSSL_VERSION_NUMBER < 0x10000000L 647 /* 648 * This is a workaround, since the following line causes 649 * alignment issues in clang: 650 * name = sk_GENERAL_NAME_value(altnames, i); 651 * OpenSSL explicitly warns not to use those macros 652 * directly, but there isn't much choice (and there 653 * shouldn't be any ill side effects) 654 */ 655 name = (GENERAL_NAME *)SKM_sk_value(void, altnames, i); 656 #else 657 name = sk_GENERAL_NAME_value(altnames, i); 658 #endif 659 ns = (const char *)ASN1_STRING_data(name->d.ia5); 660 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 661 662 if (name->type == GEN_DNS && ip == NULL && 663 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 664 return (1); 665 else if (name->type == GEN_IPADD && ip != NULL && 666 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 667 return (1); 668 } 669 return (0); 670 } 671 672 /* 673 * Verify server certificate by CN. 674 */ 675 static int 676 fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 677 struct addrinfo *ip) 678 { 679 ASN1_STRING *namedata; 680 X509_NAME_ENTRY *nameentry; 681 int cnlen, lastpos, loc, ret; 682 unsigned char *cn; 683 684 ret = 0; 685 lastpos = -1; 686 loc = -1; 687 cn = NULL; 688 /* get most specific CN (last entry in list) and compare */ 689 while ((lastpos = X509_NAME_get_index_by_NID(subject, 690 NID_commonName, lastpos)) != -1) 691 loc = lastpos; 692 693 if (loc > -1) { 694 nameentry = X509_NAME_get_entry(subject, loc); 695 namedata = X509_NAME_ENTRY_get_data(nameentry); 696 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 697 if (ip == NULL && 698 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 699 ret = 1; 700 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 701 ret = 1; 702 OPENSSL_free(cn); 703 } 704 return (ret); 705 } 706 707 /* 708 * Verify that server certificate subjectAltName/CN matches 709 * hostname. First check, if there are alternative subject names. If yes, 710 * those have to match. Only if those don't exist it falls back to 711 * checking the subject's CN. 712 */ 713 static int 714 fetch_ssl_verify_hname(X509 *cert, const char *host) 715 { 716 struct addrinfo *ip; 717 STACK_OF(GENERAL_NAME) *altnames; 718 X509_NAME *subject; 719 int ret; 720 721 ret = 0; 722 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 723 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 724 NULL, NULL); 725 726 if (altnames != NULL) { 727 ret = fetch_ssl_verify_altname(altnames, host, ip); 728 } else { 729 subject = X509_get_subject_name(cert); 730 if (subject != NULL) 731 ret = fetch_ssl_verify_cn(subject, host, ip); 732 } 733 734 if (ip != NULL) 735 freeaddrinfo(ip); 736 if (altnames != NULL) 737 GENERAL_NAMES_free(altnames); 738 return (ret); 739 } 740 741 /* 742 * Configure transport security layer based on environment. 743 */ 744 static void 745 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 746 { 747 long ssl_ctx_options; 748 749 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET; 750 if (getenv("SSL_ALLOW_SSL3") == NULL) 751 ssl_ctx_options |= SSL_OP_NO_SSLv3; 752 if (getenv("SSL_NO_TLS1") != NULL) 753 ssl_ctx_options |= SSL_OP_NO_TLSv1; 754 if (getenv("SSL_NO_TLS1_1") != NULL) 755 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 756 if (getenv("SSL_NO_TLS1_2") != NULL) 757 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 758 if (verbose) 759 fetch_info("SSL options: %lx", ssl_ctx_options); 760 SSL_CTX_set_options(ctx, ssl_ctx_options); 761 } 762 763 764 /* 765 * Configure peer verification based on environment. 766 */ 767 #define LOCAL_CERT_FILE "/usr/local/etc/ssl/cert.pem" 768 #define BASE_CERT_FILE "/etc/ssl/cert.pem" 769 static int 770 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 771 { 772 X509_LOOKUP *crl_lookup; 773 X509_STORE *crl_store; 774 const char *ca_cert_file, *ca_cert_path, *crl_file; 775 776 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 777 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 778 if (ca_cert_file == NULL && 779 access(LOCAL_CERT_FILE, R_OK) == 0) 780 ca_cert_file = LOCAL_CERT_FILE; 781 if (ca_cert_file == NULL && 782 access(BASE_CERT_FILE, R_OK) == 0) 783 ca_cert_file = BASE_CERT_FILE; 784 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 785 if (verbose) { 786 fetch_info("Peer verification enabled"); 787 if (ca_cert_file != NULL) 788 fetch_info("Using CA cert file: %s", 789 ca_cert_file); 790 if (ca_cert_path != NULL) 791 fetch_info("Using CA cert path: %s", 792 ca_cert_path); 793 if (ca_cert_file == NULL && ca_cert_path == NULL) 794 fetch_info("Using OpenSSL default " 795 "CA cert file and path"); 796 } 797 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 798 fetch_ssl_cb_verify_crt); 799 if (ca_cert_file != NULL || ca_cert_path != NULL) 800 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 801 ca_cert_path); 802 else 803 SSL_CTX_set_default_verify_paths(ctx); 804 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 805 if (verbose) 806 fetch_info("Using CRL file: %s", crl_file); 807 crl_store = SSL_CTX_get_cert_store(ctx); 808 crl_lookup = X509_STORE_add_lookup(crl_store, 809 X509_LOOKUP_file()); 810 if (crl_lookup == NULL || 811 !X509_load_crl_file(crl_lookup, crl_file, 812 X509_FILETYPE_PEM)) { 813 fprintf(stderr, 814 "Could not load CRL file %s\n", 815 crl_file); 816 return (0); 817 } 818 X509_STORE_set_flags(crl_store, 819 X509_V_FLAG_CRL_CHECK | 820 X509_V_FLAG_CRL_CHECK_ALL); 821 } 822 } 823 return (1); 824 } 825 826 /* 827 * Configure client certificate based on environment. 828 */ 829 static int 830 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 831 { 832 const char *client_cert_file, *client_key_file; 833 834 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 835 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 836 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 837 if (verbose) { 838 fetch_info("Using client cert file: %s", 839 client_cert_file); 840 fetch_info("Using client key file: %s", 841 client_key_file); 842 } 843 if (SSL_CTX_use_certificate_chain_file(ctx, 844 client_cert_file) != 1) { 845 fprintf(stderr, 846 "Could not load client certificate %s\n", 847 client_cert_file); 848 return (0); 849 } 850 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 851 SSL_FILETYPE_PEM) != 1) { 852 fprintf(stderr, 853 "Could not load client key %s\n", 854 client_key_file); 855 return (0); 856 } 857 } 858 return (1); 859 } 860 861 /* 862 * Callback for SSL certificate verification, this is called on server 863 * cert verification. It takes no decision, but informs the user in case 864 * verification failed. 865 */ 866 int 867 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 868 { 869 X509 *crt; 870 X509_NAME *name; 871 char *str; 872 873 str = NULL; 874 if (!verified) { 875 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 876 (name = X509_get_subject_name(crt)) != NULL) 877 str = X509_NAME_oneline(name, 0, 0); 878 fprintf(stderr, "Certificate verification failed for %s\n", 879 str != NULL ? str : "no relevant certificate"); 880 OPENSSL_free(str); 881 } 882 return (verified); 883 } 884 885 #endif 886 887 /* 888 * Enable SSL on a connection. 889 */ 890 int 891 fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 892 { 893 #ifdef WITH_SSL 894 int ret, ssl_err; 895 X509_NAME *name; 896 char *str; 897 898 /* Init the SSL library and context */ 899 if (!SSL_library_init()){ 900 fprintf(stderr, "SSL library init failed\n"); 901 return (-1); 902 } 903 904 SSL_load_error_strings(); 905 906 conn->ssl_meth = SSLv23_client_method(); 907 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 908 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 909 910 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 911 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 912 return (-1); 913 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 914 return (-1); 915 916 conn->ssl = SSL_new(conn->ssl_ctx); 917 if (conn->ssl == NULL) { 918 fprintf(stderr, "SSL context creation failed\n"); 919 return (-1); 920 } 921 SSL_set_fd(conn->ssl, conn->sd); 922 923 #if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT) 924 if (!SSL_set_tlsext_host_name(conn->ssl, 925 __DECONST(struct url *, URL)->host)) { 926 fprintf(stderr, 927 "TLS server name indication extension failed for host %s\n", 928 URL->host); 929 return (-1); 930 } 931 #endif 932 while ((ret = SSL_connect(conn->ssl)) == -1) { 933 ssl_err = SSL_get_error(conn->ssl, ret); 934 if (ssl_err != SSL_ERROR_WANT_READ && 935 ssl_err != SSL_ERROR_WANT_WRITE) { 936 ERR_print_errors_fp(stderr); 937 return (-1); 938 } 939 } 940 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 941 942 if (conn->ssl_cert == NULL) { 943 fprintf(stderr, "No server SSL certificate\n"); 944 return (-1); 945 } 946 947 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 948 if (verbose) 949 fetch_info("Verify hostname"); 950 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 951 fprintf(stderr, 952 "SSL certificate subject doesn't match host %s\n", 953 URL->host); 954 return (-1); 955 } 956 } 957 958 if (verbose) { 959 fetch_info("%s connection established using %s", 960 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 961 name = X509_get_subject_name(conn->ssl_cert); 962 str = X509_NAME_oneline(name, 0, 0); 963 fetch_info("Certificate subject: %s", str); 964 OPENSSL_free(str); 965 name = X509_get_issuer_name(conn->ssl_cert); 966 str = X509_NAME_oneline(name, 0, 0); 967 fetch_info("Certificate issuer: %s", str); 968 OPENSSL_free(str); 969 } 970 971 return (0); 972 #else 973 (void)conn; 974 (void)verbose; 975 fprintf(stderr, "SSL support disabled\n"); 976 return (-1); 977 #endif 978 } 979 980 #define FETCH_READ_WAIT -2 981 #define FETCH_READ_ERROR -1 982 #define FETCH_READ_DONE 0 983 984 #ifdef WITH_SSL 985 static ssize_t 986 fetch_ssl_read(SSL *ssl, char *buf, size_t len) 987 { 988 ssize_t rlen; 989 int ssl_err; 990 991 rlen = SSL_read(ssl, buf, len); 992 if (rlen < 0) { 993 ssl_err = SSL_get_error(ssl, rlen); 994 if (ssl_err == SSL_ERROR_WANT_READ || 995 ssl_err == SSL_ERROR_WANT_WRITE) { 996 return (FETCH_READ_WAIT); 997 } else { 998 ERR_print_errors_fp(stderr); 999 return (FETCH_READ_ERROR); 1000 } 1001 } 1002 return (rlen); 1003 } 1004 #endif 1005 1006 static ssize_t 1007 fetch_socket_read(int sd, char *buf, size_t len) 1008 { 1009 ssize_t rlen; 1010 1011 rlen = read(sd, buf, len); 1012 if (rlen < 0) { 1013 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 1014 return (FETCH_READ_WAIT); 1015 else 1016 return (FETCH_READ_ERROR); 1017 } 1018 return (rlen); 1019 } 1020 1021 /* 1022 * Read a character from a connection w/ timeout 1023 */ 1024 ssize_t 1025 fetch_read(conn_t *conn, char *buf, size_t len) 1026 { 1027 struct timeval now, timeout, delta; 1028 struct pollfd pfd; 1029 ssize_t rlen; 1030 int deltams; 1031 1032 if (fetchTimeout > 0) { 1033 gettimeofday(&timeout, NULL); 1034 timeout.tv_sec += fetchTimeout; 1035 } 1036 1037 deltams = INFTIM; 1038 memset(&pfd, 0, sizeof pfd); 1039 pfd.fd = conn->sd; 1040 pfd.events = POLLIN | POLLERR; 1041 1042 for (;;) { 1043 /* 1044 * The socket is non-blocking. Instead of the canonical 1045 * poll() -> read(), we do the following: 1046 * 1047 * 1) call read() or SSL_read(). 1048 * 2) if we received some data, return it. 1049 * 3) if an error occurred, return -1. 1050 * 4) if read() or SSL_read() signaled EOF, return. 1051 * 5) if we did not receive any data but we're not at EOF, 1052 * call poll(). 1053 * 1054 * In the SSL case, this is necessary because if we 1055 * receive a close notification, we have to call 1056 * SSL_read() one additional time after we've read 1057 * everything we received. 1058 * 1059 * In the non-SSL case, it may improve performance (very 1060 * slightly) when reading small amounts of data. 1061 */ 1062 #ifdef WITH_SSL 1063 if (conn->ssl != NULL) 1064 rlen = fetch_ssl_read(conn->ssl, buf, len); 1065 else 1066 #endif 1067 rlen = fetch_socket_read(conn->sd, buf, len); 1068 if (rlen >= 0) { 1069 break; 1070 } else if (rlen == FETCH_READ_ERROR) { 1071 fetch_syserr(); 1072 return (-1); 1073 } 1074 // assert(rlen == FETCH_READ_WAIT); 1075 if (fetchTimeout > 0) { 1076 gettimeofday(&now, NULL); 1077 if (!timercmp(&timeout, &now, >)) { 1078 errno = ETIMEDOUT; 1079 fetch_syserr(); 1080 return (-1); 1081 } 1082 timersub(&timeout, &now, &delta); 1083 deltams = delta.tv_sec * 1000 + 1084 delta.tv_usec / 1000;; 1085 } 1086 errno = 0; 1087 pfd.revents = 0; 1088 if (poll(&pfd, 1, deltams) < 0) { 1089 if (errno == EINTR && fetchRestartCalls) 1090 continue; 1091 fetch_syserr(); 1092 return (-1); 1093 } 1094 } 1095 return (rlen); 1096 } 1097 1098 1099 /* 1100 * Read a line of text from a connection w/ timeout 1101 */ 1102 #define MIN_BUF_SIZE 1024 1103 1104 int 1105 fetch_getln(conn_t *conn) 1106 { 1107 char *tmp; 1108 size_t tmpsize; 1109 ssize_t len; 1110 char c; 1111 1112 if (conn->buf == NULL) { 1113 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 1114 errno = ENOMEM; 1115 return (-1); 1116 } 1117 conn->bufsize = MIN_BUF_SIZE; 1118 } 1119 1120 conn->buf[0] = '\0'; 1121 conn->buflen = 0; 1122 1123 do { 1124 len = fetch_read(conn, &c, 1); 1125 if (len == -1) 1126 return (-1); 1127 if (len == 0) 1128 break; 1129 conn->buf[conn->buflen++] = c; 1130 if (conn->buflen == conn->bufsize) { 1131 tmp = conn->buf; 1132 tmpsize = conn->bufsize * 2 + 1; 1133 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 1134 errno = ENOMEM; 1135 return (-1); 1136 } 1137 conn->buf = tmp; 1138 conn->bufsize = tmpsize; 1139 } 1140 } while (c != '\n'); 1141 1142 conn->buf[conn->buflen] = '\0'; 1143 DEBUG(fprintf(stderr, "<<< %s", conn->buf)); 1144 return (0); 1145 } 1146 1147 1148 /* 1149 * Write to a connection w/ timeout 1150 */ 1151 ssize_t 1152 fetch_write(conn_t *conn, const char *buf, size_t len) 1153 { 1154 struct iovec iov; 1155 1156 iov.iov_base = __DECONST(char *, buf); 1157 iov.iov_len = len; 1158 return fetch_writev(conn, &iov, 1); 1159 } 1160 1161 /* 1162 * Write a vector to a connection w/ timeout 1163 * Note: can modify the iovec. 1164 */ 1165 ssize_t 1166 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1167 { 1168 struct timeval now, timeout, delta; 1169 struct pollfd pfd; 1170 ssize_t wlen, total; 1171 int deltams; 1172 1173 memset(&pfd, 0, sizeof pfd); 1174 if (fetchTimeout) { 1175 pfd.fd = conn->sd; 1176 pfd.events = POLLOUT | POLLERR; 1177 gettimeofday(&timeout, NULL); 1178 timeout.tv_sec += fetchTimeout; 1179 } 1180 1181 total = 0; 1182 while (iovcnt > 0) { 1183 while (fetchTimeout && pfd.revents == 0) { 1184 gettimeofday(&now, NULL); 1185 if (!timercmp(&timeout, &now, >)) { 1186 errno = ETIMEDOUT; 1187 fetch_syserr(); 1188 return (-1); 1189 } 1190 timersub(&timeout, &now, &delta); 1191 deltams = delta.tv_sec * 1000 + 1192 delta.tv_usec / 1000; 1193 errno = 0; 1194 pfd.revents = 0; 1195 if (poll(&pfd, 1, deltams) < 0) { 1196 /* POSIX compliance */ 1197 if (errno == EAGAIN) 1198 continue; 1199 if (errno == EINTR && fetchRestartCalls) 1200 continue; 1201 return (-1); 1202 } 1203 } 1204 errno = 0; 1205 #ifdef WITH_SSL 1206 if (conn->ssl != NULL) 1207 wlen = SSL_write(conn->ssl, 1208 iov->iov_base, iov->iov_len); 1209 else 1210 #endif 1211 wlen = writev(conn->sd, iov, iovcnt); 1212 if (wlen == 0) { 1213 /* we consider a short write a failure */ 1214 /* XXX perhaps we shouldn't in the SSL case */ 1215 errno = EPIPE; 1216 fetch_syserr(); 1217 return (-1); 1218 } 1219 if (wlen < 0) { 1220 if (errno == EINTR && fetchRestartCalls) 1221 continue; 1222 return (-1); 1223 } 1224 total += wlen; 1225 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1226 wlen -= iov->iov_len; 1227 iov++; 1228 iovcnt--; 1229 } 1230 if (iovcnt > 0) { 1231 iov->iov_len -= wlen; 1232 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1233 } 1234 } 1235 return (total); 1236 } 1237 1238 1239 /* 1240 * Write a line of text to a connection w/ timeout 1241 */ 1242 int 1243 fetch_putln(conn_t *conn, const char *str, size_t len) 1244 { 1245 struct iovec iov[2]; 1246 int ret; 1247 1248 DEBUG(fprintf(stderr, ">>> %s\n", str)); 1249 iov[0].iov_base = __DECONST(char *, str); 1250 iov[0].iov_len = len; 1251 iov[1].iov_base = __DECONST(char *, ENDL); 1252 iov[1].iov_len = sizeof(ENDL); 1253 if (len == 0) 1254 ret = fetch_writev(conn, &iov[1], 1); 1255 else 1256 ret = fetch_writev(conn, iov, 2); 1257 if (ret == -1) 1258 return (-1); 1259 return (0); 1260 } 1261 1262 1263 /* 1264 * Close connection 1265 */ 1266 int 1267 fetch_close(conn_t *conn) 1268 { 1269 int ret; 1270 1271 if (--conn->ref > 0) 1272 return (0); 1273 #ifdef WITH_SSL 1274 if (conn->ssl) { 1275 SSL_shutdown(conn->ssl); 1276 SSL_set_connect_state(conn->ssl); 1277 SSL_free(conn->ssl); 1278 conn->ssl = NULL; 1279 } 1280 if (conn->ssl_ctx) { 1281 SSL_CTX_free(conn->ssl_ctx); 1282 conn->ssl_ctx = NULL; 1283 } 1284 if (conn->ssl_cert) { 1285 X509_free(conn->ssl_cert); 1286 conn->ssl_cert = NULL; 1287 } 1288 #endif 1289 ret = close(conn->sd); 1290 free(conn->buf); 1291 free(conn); 1292 return (ret); 1293 } 1294 1295 1296 /*** Directory-related utility functions *************************************/ 1297 1298 int 1299 fetch_add_entry(struct url_ent **p, int *size, int *len, 1300 const char *name, struct url_stat *us) 1301 { 1302 struct url_ent *tmp; 1303 1304 if (*p == NULL) { 1305 *size = 0; 1306 *len = 0; 1307 } 1308 1309 if (*len >= *size - 1) { 1310 tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p)); 1311 if (tmp == NULL) { 1312 errno = ENOMEM; 1313 fetch_syserr(); 1314 return (-1); 1315 } 1316 *size = (*size * 2 + 1); 1317 *p = tmp; 1318 } 1319 1320 tmp = *p + *len; 1321 snprintf(tmp->name, PATH_MAX, "%s", name); 1322 memcpy(&tmp->stat, us, sizeof(*us)); 1323 1324 (*len)++; 1325 (++tmp)->name[0] = 0; 1326 1327 return (0); 1328 } 1329 1330 1331 /*** Authentication-related utility functions ********************************/ 1332 1333 static const char * 1334 fetch_read_word(FILE *f) 1335 { 1336 static char word[1024]; 1337 1338 if (fscanf(f, " %1023s ", word) != 1) 1339 return (NULL); 1340 return (word); 1341 } 1342 1343 /* 1344 * Get authentication data for a URL from .netrc 1345 */ 1346 int 1347 fetch_netrc_auth(struct url *url) 1348 { 1349 char fn[PATH_MAX]; 1350 const char *word; 1351 char *p; 1352 FILE *f; 1353 1354 if ((p = getenv("NETRC")) != NULL) { 1355 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1356 fetch_info("$NETRC specifies a file name " 1357 "longer than PATH_MAX"); 1358 return (-1); 1359 } 1360 } else { 1361 if ((p = getenv("HOME")) != NULL) { 1362 struct passwd *pwd; 1363 1364 if ((pwd = getpwuid(getuid())) == NULL || 1365 (p = pwd->pw_dir) == NULL) 1366 return (-1); 1367 } 1368 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1369 return (-1); 1370 } 1371 1372 if ((f = fopen(fn, "r")) == NULL) 1373 return (-1); 1374 while ((word = fetch_read_word(f)) != NULL) { 1375 if (strcmp(word, "default") == 0) { 1376 DEBUG(fetch_info("Using default .netrc settings")); 1377 break; 1378 } 1379 if (strcmp(word, "machine") == 0 && 1380 (word = fetch_read_word(f)) != NULL && 1381 strcasecmp(word, url->host) == 0) { 1382 DEBUG(fetch_info("Using .netrc settings for %s", word)); 1383 break; 1384 } 1385 } 1386 if (word == NULL) 1387 goto ferr; 1388 while ((word = fetch_read_word(f)) != NULL) { 1389 if (strcmp(word, "login") == 0) { 1390 if ((word = fetch_read_word(f)) == NULL) 1391 goto ferr; 1392 if (snprintf(url->user, sizeof(url->user), 1393 "%s", word) > (int)sizeof(url->user)) { 1394 fetch_info("login name in .netrc is too long"); 1395 url->user[0] = '\0'; 1396 } 1397 } else if (strcmp(word, "password") == 0) { 1398 if ((word = fetch_read_word(f)) == NULL) 1399 goto ferr; 1400 if (snprintf(url->pwd, sizeof(url->pwd), 1401 "%s", word) > (int)sizeof(url->pwd)) { 1402 fetch_info("password in .netrc is too long"); 1403 url->pwd[0] = '\0'; 1404 } 1405 } else if (strcmp(word, "account") == 0) { 1406 if ((word = fetch_read_word(f)) == NULL) 1407 goto ferr; 1408 /* XXX not supported! */ 1409 } else { 1410 break; 1411 } 1412 } 1413 fclose(f); 1414 return (0); 1415 ferr: 1416 fclose(f); 1417 return (-1); 1418 } 1419 1420 /* 1421 * The no_proxy environment variable specifies a set of domains for 1422 * which the proxy should not be consulted; the contents is a comma-, 1423 * or space-separated list of domain names. A single asterisk will 1424 * override all proxy variables and no transactions will be proxied 1425 * (for compatibility with lynx and curl, see the discussion at 1426 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1427 */ 1428 int 1429 fetch_no_proxy_match(const char *host) 1430 { 1431 const char *no_proxy, *p, *q; 1432 size_t h_len, d_len; 1433 1434 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1435 (no_proxy = getenv("no_proxy")) == NULL) 1436 return (0); 1437 1438 /* asterisk matches any hostname */ 1439 if (strcmp(no_proxy, "*") == 0) 1440 return (1); 1441 1442 h_len = strlen(host); 1443 p = no_proxy; 1444 do { 1445 /* position p at the beginning of a domain suffix */ 1446 while (*p == ',' || isspace((unsigned char)*p)) 1447 p++; 1448 1449 /* position q at the first separator character */ 1450 for (q = p; *q; ++q) 1451 if (*q == ',' || isspace((unsigned char)*q)) 1452 break; 1453 1454 d_len = q - p; 1455 if (d_len > 0 && h_len >= d_len && 1456 strncasecmp(host + h_len - d_len, 1457 p, d_len) == 0) { 1458 /* domain name matches */ 1459 return (1); 1460 } 1461 1462 p = q + 1; 1463 } while (*q); 1464 1465 return (0); 1466 } 1467