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; 338 339 /* resolve client address */ 340 bindaddr = getenv("FETCH_BIND_ADDRESS"); 341 if (bindaddr != NULL && *bindaddr != '\0') { 342 if (verbose) 343 fetch_info("resolving client address: %s", bindaddr); 344 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL) 345 goto fail; 346 } 347 348 /* try each server address in turn */ 349 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) { 350 /* open socket */ 351 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0) 352 goto syserr; 353 /* attempt to bind to client address */ 354 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) { 355 if (cai->ai_family != sai->ai_family) 356 continue; 357 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0) 358 break; 359 } 360 if (err != 0) { 361 if (verbose) 362 fetch_info("failed to bind to %s", bindaddr); 363 goto syserr; 364 } 365 /* attempt to connect to server address */ 366 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0) 367 break; 368 /* clean up before next attempt */ 369 close(sd); 370 sd = -1; 371 } 372 if (err != 0) { 373 if (verbose) 374 fetch_info("failed to connect to %s:%s", host, port); 375 goto syserr; 376 } 377 378 if ((conn = fetch_reopen(sd)) == NULL) 379 goto syserr; 380 if (cais != NULL) 381 freeaddrinfo(cais); 382 if (sais != NULL) 383 freeaddrinfo(sais); 384 return (conn); 385 syserr: 386 fetch_syserr(); 387 goto fail; 388 fail: 389 if (sd >= 0) 390 close(sd); 391 if (cais != NULL) 392 freeaddrinfo(cais); 393 if (sais != NULL) 394 freeaddrinfo(sais); 395 return (NULL); 396 } 397 398 #ifdef WITH_SSL 399 /* 400 * Convert characters A-Z to lowercase (intentionally avoid any locale 401 * specific conversions). 402 */ 403 static char 404 fetch_ssl_tolower(char in) 405 { 406 if (in >= 'A' && in <= 'Z') 407 return (in + 32); 408 else 409 return (in); 410 } 411 412 /* 413 * isalpha implementation that intentionally avoids any locale specific 414 * conversions. 415 */ 416 static int 417 fetch_ssl_isalpha(char in) 418 { 419 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 420 } 421 422 /* 423 * Check if passed hostnames a and b are equal. 424 */ 425 static int 426 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 427 size_t blen) 428 { 429 size_t i; 430 431 if (alen != blen) 432 return (0); 433 for (i = 0; i < alen; ++i) { 434 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 435 return (0); 436 } 437 return (1); 438 } 439 440 /* 441 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 442 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 443 * numeric characters. Double hyphens (like they're found in IDN a-labels 444 * 'xn--') are not allowed. Empty labels are invalid. 445 */ 446 static int 447 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 448 { 449 size_t i; 450 451 if (!len || l[0] == '-' || l[len-1] == '-') 452 return (0); 453 for (i = 0; i < len; ++i) { 454 if (!isdigit(l[i]) && 455 !fetch_ssl_isalpha(l[i]) && 456 !(l[i] == '*' && wcok) && 457 !(l[i] == '-' && l[i - 1] != '-')) 458 return (0); 459 } 460 return (1); 461 } 462 463 /* 464 * Check if host name consists only of numbers. This might indicate an IP 465 * address, which is not a good idea for CN wildcard comparison. 466 */ 467 static int 468 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 469 { 470 size_t i; 471 472 for (i = 0; i < len; ++i) { 473 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 474 hostname[i] == '.')) 475 return (0); 476 } 477 return (1); 478 } 479 480 /* 481 * Check if the host name h passed matches the pattern passed in m which 482 * is usually part of subjectAltName or CN of a certificate presented to 483 * the client. This includes wildcard matching. The algorithm is based on 484 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 485 */ 486 static int 487 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 488 size_t mlen) 489 { 490 int delta, hdotidx, mdot1idx, wcidx; 491 const char *hdot, *mdot1, *mdot2; 492 const char *wc; /* wildcard */ 493 494 if (!(h && *h && m && *m)) 495 return (0); 496 if ((wc = strnstr(m, "*", mlen)) == NULL) 497 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 498 wcidx = wc - m; 499 /* hostname should not be just dots and numbers */ 500 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 501 return (0); 502 /* only one wildcard allowed in pattern */ 503 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 504 return (0); 505 /* 506 * there must be at least two more domain labels and 507 * wildcard has to be in the leftmost label (RFC6125) 508 */ 509 mdot1 = strnstr(m, ".", mlen); 510 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 511 return (0); 512 mdot1idx = mdot1 - m; 513 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 514 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 515 return (0); 516 /* hostname must contain a dot and not be the 1st char */ 517 hdot = strnstr(h, ".", hlen); 518 if (hdot == NULL || hdot == h) 519 return (0); 520 hdotidx = hdot - h; 521 /* 522 * host part of hostname must be at least as long as 523 * pattern it's supposed to match 524 */ 525 if (hdotidx < mdot1idx) 526 return (0); 527 /* 528 * don't allow wildcards in non-traditional domain names 529 * (IDN, A-label, U-label...) 530 */ 531 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 532 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 533 return (0); 534 /* match domain part (part after first dot) */ 535 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 536 mlen - mdot1idx)) 537 return (0); 538 /* match part left of wildcard */ 539 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 540 return (0); 541 /* match part right of wildcard */ 542 delta = mdot1idx - wcidx - 1; 543 if (!fetch_ssl_hname_equal(hdot - delta, delta, 544 mdot1 - delta, delta)) 545 return (0); 546 /* all tests succeeded, it's a match */ 547 return (1); 548 } 549 550 /* 551 * Get numeric host address info - returns NULL if host was not an IP 552 * address. The caller is responsible for deallocation using 553 * freeaddrinfo(3). 554 */ 555 static struct addrinfo * 556 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 557 { 558 struct addrinfo hints, *res; 559 char *host; 560 561 host = (char *)malloc(len + 1); 562 memcpy(host, hostname, len); 563 host[len] = '\0'; 564 memset(&hints, 0, sizeof(hints)); 565 hints.ai_family = PF_UNSPEC; 566 hints.ai_socktype = SOCK_STREAM; 567 hints.ai_protocol = 0; 568 hints.ai_flags = AI_NUMERICHOST; 569 /* port is not relevant for this purpose */ 570 if (getaddrinfo(host, "443", &hints, &res) != 0) 571 res = NULL; 572 free(host); 573 return res; 574 } 575 576 /* 577 * Compare ip address in addrinfo with address passes. 578 */ 579 static int 580 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 581 size_t rhostlen) 582 { 583 const void *left; 584 585 if (lhost->ai_family == AF_INET && rhostlen == 4) { 586 left = (void *)&((struct sockaddr_in*)(void *) 587 lhost->ai_addr)->sin_addr.s_addr; 588 #ifdef INET6 589 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 590 left = (void *)&((struct sockaddr_in6 *)(void *) 591 lhost->ai_addr)->sin6_addr; 592 #endif 593 } else 594 return (0); 595 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 596 } 597 598 /* 599 * Compare ip address in addrinfo with host passed. If host is not an IP 600 * address, comparison will fail. 601 */ 602 static int 603 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 604 size_t rlen) 605 { 606 struct addrinfo *raddr; 607 int ret; 608 char *rip; 609 610 ret = 0; 611 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 612 return 0; /* not a numeric host */ 613 614 if (laddr->ai_family == raddr->ai_family) { 615 if (laddr->ai_family == AF_INET) { 616 rip = (char *)&((struct sockaddr_in *)(void *) 617 raddr->ai_addr)->sin_addr.s_addr; 618 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 619 #ifdef INET6 620 } else if (laddr->ai_family == AF_INET6) { 621 rip = (char *)&((struct sockaddr_in6 *)(void *) 622 raddr->ai_addr)->sin6_addr; 623 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 624 #endif 625 } 626 627 } 628 freeaddrinfo(raddr); 629 return (ret); 630 } 631 632 /* 633 * Verify server certificate by subjectAltName. 634 */ 635 static int 636 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 637 const char *host, struct addrinfo *ip) 638 { 639 const GENERAL_NAME *name; 640 size_t nslen; 641 int i; 642 const char *ns; 643 644 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 645 #if OPENSSL_VERSION_NUMBER < 0x10000000L 646 /* 647 * This is a workaround, since the following line causes 648 * alignment issues in clang: 649 * name = sk_GENERAL_NAME_value(altnames, i); 650 * OpenSSL explicitly warns not to use those macros 651 * directly, but there isn't much choice (and there 652 * shouldn't be any ill side effects) 653 */ 654 name = (GENERAL_NAME *)SKM_sk_value(void, altnames, i); 655 #else 656 name = sk_GENERAL_NAME_value(altnames, i); 657 #endif 658 ns = (const char *)ASN1_STRING_data(name->d.ia5); 659 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 660 661 if (name->type == GEN_DNS && ip == NULL && 662 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 663 return (1); 664 else if (name->type == GEN_IPADD && ip != NULL && 665 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 666 return (1); 667 } 668 return (0); 669 } 670 671 /* 672 * Verify server certificate by CN. 673 */ 674 static int 675 fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 676 struct addrinfo *ip) 677 { 678 ASN1_STRING *namedata; 679 X509_NAME_ENTRY *nameentry; 680 int cnlen, lastpos, loc, ret; 681 unsigned char *cn; 682 683 ret = 0; 684 lastpos = -1; 685 loc = -1; 686 cn = NULL; 687 /* get most specific CN (last entry in list) and compare */ 688 while ((lastpos = X509_NAME_get_index_by_NID(subject, 689 NID_commonName, lastpos)) != -1) 690 loc = lastpos; 691 692 if (loc > -1) { 693 nameentry = X509_NAME_get_entry(subject, loc); 694 namedata = X509_NAME_ENTRY_get_data(nameentry); 695 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 696 if (ip == NULL && 697 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 698 ret = 1; 699 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 700 ret = 1; 701 OPENSSL_free(cn); 702 } 703 return (ret); 704 } 705 706 /* 707 * Verify that server certificate subjectAltName/CN matches 708 * hostname. First check, if there are alternative subject names. If yes, 709 * those have to match. Only if those don't exist it falls back to 710 * checking the subject's CN. 711 */ 712 static int 713 fetch_ssl_verify_hname(X509 *cert, const char *host) 714 { 715 struct addrinfo *ip; 716 STACK_OF(GENERAL_NAME) *altnames; 717 X509_NAME *subject; 718 int ret; 719 720 ret = 0; 721 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 722 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 723 NULL, NULL); 724 725 if (altnames != NULL) { 726 ret = fetch_ssl_verify_altname(altnames, host, ip); 727 } else { 728 subject = X509_get_subject_name(cert); 729 if (subject != NULL) 730 ret = fetch_ssl_verify_cn(subject, host, ip); 731 } 732 733 if (ip != NULL) 734 freeaddrinfo(ip); 735 if (altnames != NULL) 736 GENERAL_NAMES_free(altnames); 737 return (ret); 738 } 739 740 /* 741 * Configure transport security layer based on environment. 742 */ 743 static void 744 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 745 { 746 long ssl_ctx_options; 747 748 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET; 749 if (getenv("SSL_ALLOW_SSL3") == NULL) 750 ssl_ctx_options |= SSL_OP_NO_SSLv3; 751 if (getenv("SSL_NO_TLS1") != NULL) 752 ssl_ctx_options |= SSL_OP_NO_TLSv1; 753 if (getenv("SSL_NO_TLS1_1") != NULL) 754 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 755 if (getenv("SSL_NO_TLS1_2") != NULL) 756 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 757 if (verbose) 758 fetch_info("SSL options: %lx", ssl_ctx_options); 759 SSL_CTX_set_options(ctx, ssl_ctx_options); 760 } 761 762 763 /* 764 * Configure peer verification based on environment. 765 */ 766 #define LOCAL_CERT_FILE "/usr/local/etc/ssl/cert.pem" 767 #define BASE_CERT_FILE "/etc/ssl/cert.pem" 768 static int 769 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 770 { 771 X509_LOOKUP *crl_lookup; 772 X509_STORE *crl_store; 773 const char *ca_cert_file, *ca_cert_path, *crl_file; 774 775 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 776 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 777 if (ca_cert_file == NULL && 778 access(LOCAL_CERT_FILE, R_OK) == 0) 779 ca_cert_file = LOCAL_CERT_FILE; 780 if (ca_cert_file == NULL && 781 access(BASE_CERT_FILE, R_OK) == 0) 782 ca_cert_file = BASE_CERT_FILE; 783 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 784 if (verbose) { 785 fetch_info("Peer verification enabled"); 786 if (ca_cert_file != NULL) 787 fetch_info("Using CA cert file: %s", 788 ca_cert_file); 789 if (ca_cert_path != NULL) 790 fetch_info("Using CA cert path: %s", 791 ca_cert_path); 792 if (ca_cert_file == NULL && ca_cert_path == NULL) 793 fetch_info("Using OpenSSL default " 794 "CA cert file and path"); 795 } 796 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 797 fetch_ssl_cb_verify_crt); 798 if (ca_cert_file != NULL || ca_cert_path != NULL) 799 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 800 ca_cert_path); 801 else 802 SSL_CTX_set_default_verify_paths(ctx); 803 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 804 if (verbose) 805 fetch_info("Using CRL file: %s", crl_file); 806 crl_store = SSL_CTX_get_cert_store(ctx); 807 crl_lookup = X509_STORE_add_lookup(crl_store, 808 X509_LOOKUP_file()); 809 if (crl_lookup == NULL || 810 !X509_load_crl_file(crl_lookup, crl_file, 811 X509_FILETYPE_PEM)) { 812 fprintf(stderr, 813 "Could not load CRL file %s\n", 814 crl_file); 815 return (0); 816 } 817 X509_STORE_set_flags(crl_store, 818 X509_V_FLAG_CRL_CHECK | 819 X509_V_FLAG_CRL_CHECK_ALL); 820 } 821 } 822 return (1); 823 } 824 825 /* 826 * Configure client certificate based on environment. 827 */ 828 static int 829 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 830 { 831 const char *client_cert_file, *client_key_file; 832 833 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 834 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 835 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 836 if (verbose) { 837 fetch_info("Using client cert file: %s", 838 client_cert_file); 839 fetch_info("Using client key file: %s", 840 client_key_file); 841 } 842 if (SSL_CTX_use_certificate_chain_file(ctx, 843 client_cert_file) != 1) { 844 fprintf(stderr, 845 "Could not load client certificate %s\n", 846 client_cert_file); 847 return (0); 848 } 849 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 850 SSL_FILETYPE_PEM) != 1) { 851 fprintf(stderr, 852 "Could not load client key %s\n", 853 client_key_file); 854 return (0); 855 } 856 } 857 return (1); 858 } 859 860 /* 861 * Callback for SSL certificate verification, this is called on server 862 * cert verification. It takes no decision, but informs the user in case 863 * verification failed. 864 */ 865 int 866 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 867 { 868 X509 *crt; 869 X509_NAME *name; 870 char *str; 871 872 str = NULL; 873 if (!verified) { 874 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 875 (name = X509_get_subject_name(crt)) != NULL) 876 str = X509_NAME_oneline(name, 0, 0); 877 fprintf(stderr, "Certificate verification failed for %s\n", 878 str != NULL ? str : "no relevant certificate"); 879 OPENSSL_free(str); 880 } 881 return (verified); 882 } 883 884 #endif 885 886 /* 887 * Enable SSL on a connection. 888 */ 889 int 890 fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 891 { 892 #ifdef WITH_SSL 893 int ret, ssl_err; 894 X509_NAME *name; 895 char *str; 896 897 /* Init the SSL library and context */ 898 if (!SSL_library_init()){ 899 fprintf(stderr, "SSL library init failed\n"); 900 return (-1); 901 } 902 903 SSL_load_error_strings(); 904 905 conn->ssl_meth = SSLv23_client_method(); 906 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 907 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 908 909 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 910 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 911 return (-1); 912 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 913 return (-1); 914 915 conn->ssl = SSL_new(conn->ssl_ctx); 916 if (conn->ssl == NULL) { 917 fprintf(stderr, "SSL context creation failed\n"); 918 return (-1); 919 } 920 SSL_set_fd(conn->ssl, conn->sd); 921 922 #if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT) 923 if (!SSL_set_tlsext_host_name(conn->ssl, 924 __DECONST(struct url *, URL)->host)) { 925 fprintf(stderr, 926 "TLS server name indication extension failed for host %s\n", 927 URL->host); 928 return (-1); 929 } 930 #endif 931 while ((ret = SSL_connect(conn->ssl)) == -1) { 932 ssl_err = SSL_get_error(conn->ssl, ret); 933 if (ssl_err != SSL_ERROR_WANT_READ && 934 ssl_err != SSL_ERROR_WANT_WRITE) { 935 ERR_print_errors_fp(stderr); 936 return (-1); 937 } 938 } 939 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 940 941 if (conn->ssl_cert == NULL) { 942 fprintf(stderr, "No server SSL certificate\n"); 943 return (-1); 944 } 945 946 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 947 if (verbose) 948 fetch_info("Verify hostname"); 949 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 950 fprintf(stderr, 951 "SSL certificate subject doesn't match host %s\n", 952 URL->host); 953 return (-1); 954 } 955 } 956 957 if (verbose) { 958 fetch_info("%s connection established using %s", 959 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 960 name = X509_get_subject_name(conn->ssl_cert); 961 str = X509_NAME_oneline(name, 0, 0); 962 fetch_info("Certificate subject: %s", str); 963 OPENSSL_free(str); 964 name = X509_get_issuer_name(conn->ssl_cert); 965 str = X509_NAME_oneline(name, 0, 0); 966 fetch_info("Certificate issuer: %s", str); 967 OPENSSL_free(str); 968 } 969 970 return (0); 971 #else 972 (void)conn; 973 (void)verbose; 974 fprintf(stderr, "SSL support disabled\n"); 975 return (-1); 976 #endif 977 } 978 979 #define FETCH_READ_WAIT -2 980 #define FETCH_READ_ERROR -1 981 #define FETCH_READ_DONE 0 982 983 #ifdef WITH_SSL 984 static ssize_t 985 fetch_ssl_read(SSL *ssl, char *buf, size_t len) 986 { 987 ssize_t rlen; 988 int ssl_err; 989 990 rlen = SSL_read(ssl, buf, len); 991 if (rlen < 0) { 992 ssl_err = SSL_get_error(ssl, rlen); 993 if (ssl_err == SSL_ERROR_WANT_READ || 994 ssl_err == SSL_ERROR_WANT_WRITE) { 995 return (FETCH_READ_WAIT); 996 } else { 997 ERR_print_errors_fp(stderr); 998 return (FETCH_READ_ERROR); 999 } 1000 } 1001 return (rlen); 1002 } 1003 #endif 1004 1005 static ssize_t 1006 fetch_socket_read(int sd, char *buf, size_t len) 1007 { 1008 ssize_t rlen; 1009 1010 rlen = read(sd, buf, len); 1011 if (rlen < 0) { 1012 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 1013 return (FETCH_READ_WAIT); 1014 else 1015 return (FETCH_READ_ERROR); 1016 } 1017 return (rlen); 1018 } 1019 1020 /* 1021 * Read a character from a connection w/ timeout 1022 */ 1023 ssize_t 1024 fetch_read(conn_t *conn, char *buf, size_t len) 1025 { 1026 struct timeval now, timeout, delta; 1027 struct pollfd pfd; 1028 ssize_t rlen; 1029 int deltams; 1030 1031 if (fetchTimeout > 0) { 1032 gettimeofday(&timeout, NULL); 1033 timeout.tv_sec += fetchTimeout; 1034 } 1035 1036 deltams = INFTIM; 1037 memset(&pfd, 0, sizeof pfd); 1038 pfd.fd = conn->sd; 1039 pfd.events = POLLIN | POLLERR; 1040 1041 for (;;) { 1042 /* 1043 * The socket is non-blocking. Instead of the canonical 1044 * poll() -> read(), we do the following: 1045 * 1046 * 1) call read() or SSL_read(). 1047 * 2) if we received some data, return it. 1048 * 3) if an error occurred, return -1. 1049 * 4) if read() or SSL_read() signaled EOF, return. 1050 * 5) if we did not receive any data but we're not at EOF, 1051 * call poll(). 1052 * 1053 * In the SSL case, this is necessary because if we 1054 * receive a close notification, we have to call 1055 * SSL_read() one additional time after we've read 1056 * everything we received. 1057 * 1058 * In the non-SSL case, it may improve performance (very 1059 * slightly) when reading small amounts of data. 1060 */ 1061 #ifdef WITH_SSL 1062 if (conn->ssl != NULL) 1063 rlen = fetch_ssl_read(conn->ssl, buf, len); 1064 else 1065 #endif 1066 rlen = fetch_socket_read(conn->sd, buf, len); 1067 if (rlen >= 0) { 1068 break; 1069 } else if (rlen == FETCH_READ_ERROR) { 1070 fetch_syserr(); 1071 return (-1); 1072 } 1073 // assert(rlen == FETCH_READ_WAIT); 1074 if (fetchTimeout > 0) { 1075 gettimeofday(&now, NULL); 1076 if (!timercmp(&timeout, &now, >)) { 1077 errno = ETIMEDOUT; 1078 fetch_syserr(); 1079 return (-1); 1080 } 1081 timersub(&timeout, &now, &delta); 1082 deltams = delta.tv_sec * 1000 + 1083 delta.tv_usec / 1000;; 1084 } 1085 errno = 0; 1086 pfd.revents = 0; 1087 if (poll(&pfd, 1, deltams) < 0) { 1088 if (errno == EINTR && fetchRestartCalls) 1089 continue; 1090 fetch_syserr(); 1091 return (-1); 1092 } 1093 } 1094 return (rlen); 1095 } 1096 1097 1098 /* 1099 * Read a line of text from a connection w/ timeout 1100 */ 1101 #define MIN_BUF_SIZE 1024 1102 1103 int 1104 fetch_getln(conn_t *conn) 1105 { 1106 char *tmp; 1107 size_t tmpsize; 1108 ssize_t len; 1109 char c; 1110 1111 if (conn->buf == NULL) { 1112 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 1113 errno = ENOMEM; 1114 return (-1); 1115 } 1116 conn->bufsize = MIN_BUF_SIZE; 1117 } 1118 1119 conn->buf[0] = '\0'; 1120 conn->buflen = 0; 1121 1122 do { 1123 len = fetch_read(conn, &c, 1); 1124 if (len == -1) 1125 return (-1); 1126 if (len == 0) 1127 break; 1128 conn->buf[conn->buflen++] = c; 1129 if (conn->buflen == conn->bufsize) { 1130 tmp = conn->buf; 1131 tmpsize = conn->bufsize * 2 + 1; 1132 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 1133 errno = ENOMEM; 1134 return (-1); 1135 } 1136 conn->buf = tmp; 1137 conn->bufsize = tmpsize; 1138 } 1139 } while (c != '\n'); 1140 1141 conn->buf[conn->buflen] = '\0'; 1142 DEBUG(fprintf(stderr, "<<< %s", conn->buf)); 1143 return (0); 1144 } 1145 1146 1147 /* 1148 * Write to a connection w/ timeout 1149 */ 1150 ssize_t 1151 fetch_write(conn_t *conn, const char *buf, size_t len) 1152 { 1153 struct iovec iov; 1154 1155 iov.iov_base = __DECONST(char *, buf); 1156 iov.iov_len = len; 1157 return fetch_writev(conn, &iov, 1); 1158 } 1159 1160 /* 1161 * Write a vector to a connection w/ timeout 1162 * Note: can modify the iovec. 1163 */ 1164 ssize_t 1165 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1166 { 1167 struct timeval now, timeout, delta; 1168 struct pollfd pfd; 1169 ssize_t wlen, total; 1170 int deltams; 1171 1172 memset(&pfd, 0, sizeof pfd); 1173 if (fetchTimeout) { 1174 pfd.fd = conn->sd; 1175 pfd.events = POLLOUT | POLLERR; 1176 gettimeofday(&timeout, NULL); 1177 timeout.tv_sec += fetchTimeout; 1178 } 1179 1180 total = 0; 1181 while (iovcnt > 0) { 1182 while (fetchTimeout && pfd.revents == 0) { 1183 gettimeofday(&now, NULL); 1184 if (!timercmp(&timeout, &now, >)) { 1185 errno = ETIMEDOUT; 1186 fetch_syserr(); 1187 return (-1); 1188 } 1189 timersub(&timeout, &now, &delta); 1190 deltams = delta.tv_sec * 1000 + 1191 delta.tv_usec / 1000; 1192 errno = 0; 1193 pfd.revents = 0; 1194 if (poll(&pfd, 1, deltams) < 0) { 1195 /* POSIX compliance */ 1196 if (errno == EAGAIN) 1197 continue; 1198 if (errno == EINTR && fetchRestartCalls) 1199 continue; 1200 return (-1); 1201 } 1202 } 1203 errno = 0; 1204 #ifdef WITH_SSL 1205 if (conn->ssl != NULL) 1206 wlen = SSL_write(conn->ssl, 1207 iov->iov_base, iov->iov_len); 1208 else 1209 #endif 1210 wlen = writev(conn->sd, iov, iovcnt); 1211 if (wlen == 0) { 1212 /* we consider a short write a failure */ 1213 /* XXX perhaps we shouldn't in the SSL case */ 1214 errno = EPIPE; 1215 fetch_syserr(); 1216 return (-1); 1217 } 1218 if (wlen < 0) { 1219 if (errno == EINTR && fetchRestartCalls) 1220 continue; 1221 return (-1); 1222 } 1223 total += wlen; 1224 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1225 wlen -= iov->iov_len; 1226 iov++; 1227 iovcnt--; 1228 } 1229 if (iovcnt > 0) { 1230 iov->iov_len -= wlen; 1231 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1232 } 1233 } 1234 return (total); 1235 } 1236 1237 1238 /* 1239 * Write a line of text to a connection w/ timeout 1240 */ 1241 int 1242 fetch_putln(conn_t *conn, const char *str, size_t len) 1243 { 1244 struct iovec iov[2]; 1245 int ret; 1246 1247 DEBUG(fprintf(stderr, ">>> %s\n", str)); 1248 iov[0].iov_base = __DECONST(char *, str); 1249 iov[0].iov_len = len; 1250 iov[1].iov_base = __DECONST(char *, ENDL); 1251 iov[1].iov_len = sizeof(ENDL); 1252 if (len == 0) 1253 ret = fetch_writev(conn, &iov[1], 1); 1254 else 1255 ret = fetch_writev(conn, iov, 2); 1256 if (ret == -1) 1257 return (-1); 1258 return (0); 1259 } 1260 1261 1262 /* 1263 * Close connection 1264 */ 1265 int 1266 fetch_close(conn_t *conn) 1267 { 1268 int ret; 1269 1270 if (--conn->ref > 0) 1271 return (0); 1272 #ifdef WITH_SSL 1273 if (conn->ssl) { 1274 SSL_shutdown(conn->ssl); 1275 SSL_set_connect_state(conn->ssl); 1276 SSL_free(conn->ssl); 1277 conn->ssl = NULL; 1278 } 1279 if (conn->ssl_ctx) { 1280 SSL_CTX_free(conn->ssl_ctx); 1281 conn->ssl_ctx = NULL; 1282 } 1283 if (conn->ssl_cert) { 1284 X509_free(conn->ssl_cert); 1285 conn->ssl_cert = NULL; 1286 } 1287 #endif 1288 ret = close(conn->sd); 1289 free(conn->buf); 1290 free(conn); 1291 return (ret); 1292 } 1293 1294 1295 /*** Directory-related utility functions *************************************/ 1296 1297 int 1298 fetch_add_entry(struct url_ent **p, int *size, int *len, 1299 const char *name, struct url_stat *us) 1300 { 1301 struct url_ent *tmp; 1302 1303 if (*p == NULL) { 1304 *size = 0; 1305 *len = 0; 1306 } 1307 1308 if (*len >= *size - 1) { 1309 tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p)); 1310 if (tmp == NULL) { 1311 errno = ENOMEM; 1312 fetch_syserr(); 1313 return (-1); 1314 } 1315 *size = (*size * 2 + 1); 1316 *p = tmp; 1317 } 1318 1319 tmp = *p + *len; 1320 snprintf(tmp->name, PATH_MAX, "%s", name); 1321 memcpy(&tmp->stat, us, sizeof(*us)); 1322 1323 (*len)++; 1324 (++tmp)->name[0] = 0; 1325 1326 return (0); 1327 } 1328 1329 1330 /*** Authentication-related utility functions ********************************/ 1331 1332 static const char * 1333 fetch_read_word(FILE *f) 1334 { 1335 static char word[1024]; 1336 1337 if (fscanf(f, " %1023s ", word) != 1) 1338 return (NULL); 1339 return (word); 1340 } 1341 1342 /* 1343 * Get authentication data for a URL from .netrc 1344 */ 1345 int 1346 fetch_netrc_auth(struct url *url) 1347 { 1348 char fn[PATH_MAX]; 1349 const char *word; 1350 char *p; 1351 FILE *f; 1352 1353 if ((p = getenv("NETRC")) != NULL) { 1354 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1355 fetch_info("$NETRC specifies a file name " 1356 "longer than PATH_MAX"); 1357 return (-1); 1358 } 1359 } else { 1360 if ((p = getenv("HOME")) != NULL) { 1361 struct passwd *pwd; 1362 1363 if ((pwd = getpwuid(getuid())) == NULL || 1364 (p = pwd->pw_dir) == NULL) 1365 return (-1); 1366 } 1367 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1368 return (-1); 1369 } 1370 1371 if ((f = fopen(fn, "r")) == NULL) 1372 return (-1); 1373 while ((word = fetch_read_word(f)) != NULL) { 1374 if (strcmp(word, "default") == 0) { 1375 DEBUG(fetch_info("Using default .netrc settings")); 1376 break; 1377 } 1378 if (strcmp(word, "machine") == 0 && 1379 (word = fetch_read_word(f)) != NULL && 1380 strcasecmp(word, url->host) == 0) { 1381 DEBUG(fetch_info("Using .netrc settings for %s", word)); 1382 break; 1383 } 1384 } 1385 if (word == NULL) 1386 goto ferr; 1387 while ((word = fetch_read_word(f)) != NULL) { 1388 if (strcmp(word, "login") == 0) { 1389 if ((word = fetch_read_word(f)) == NULL) 1390 goto ferr; 1391 if (snprintf(url->user, sizeof(url->user), 1392 "%s", word) > (int)sizeof(url->user)) { 1393 fetch_info("login name in .netrc is too long"); 1394 url->user[0] = '\0'; 1395 } 1396 } else if (strcmp(word, "password") == 0) { 1397 if ((word = fetch_read_word(f)) == NULL) 1398 goto ferr; 1399 if (snprintf(url->pwd, sizeof(url->pwd), 1400 "%s", word) > (int)sizeof(url->pwd)) { 1401 fetch_info("password in .netrc is too long"); 1402 url->pwd[0] = '\0'; 1403 } 1404 } else if (strcmp(word, "account") == 0) { 1405 if ((word = fetch_read_word(f)) == NULL) 1406 goto ferr; 1407 /* XXX not supported! */ 1408 } else { 1409 break; 1410 } 1411 } 1412 fclose(f); 1413 return (0); 1414 ferr: 1415 fclose(f); 1416 return (-1); 1417 } 1418 1419 /* 1420 * The no_proxy environment variable specifies a set of domains for 1421 * which the proxy should not be consulted; the contents is a comma-, 1422 * or space-separated list of domain names. A single asterisk will 1423 * override all proxy variables and no transactions will be proxied 1424 * (for compatibility with lynx and curl, see the discussion at 1425 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1426 */ 1427 int 1428 fetch_no_proxy_match(const char *host) 1429 { 1430 const char *no_proxy, *p, *q; 1431 size_t h_len, d_len; 1432 1433 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1434 (no_proxy = getenv("no_proxy")) == NULL) 1435 return (0); 1436 1437 /* asterisk matches any hostname */ 1438 if (strcmp(no_proxy, "*") == 0) 1439 return (1); 1440 1441 h_len = strlen(host); 1442 p = no_proxy; 1443 do { 1444 /* position p at the beginning of a domain suffix */ 1445 while (*p == ',' || isspace((unsigned char)*p)) 1446 p++; 1447 1448 /* position q at the first separator character */ 1449 for (q = p; *q; ++q) 1450 if (*q == ',' || isspace((unsigned char)*q)) 1451 break; 1452 1453 d_len = q - p; 1454 if (d_len > 0 && h_len >= d_len && 1455 strncasecmp(host + h_len - d_len, 1456 p, d_len) == 0) { 1457 /* domain name matches */ 1458 return (1); 1459 } 1460 1461 p = q + 1; 1462 } while (*q); 1463 1464 return (0); 1465 } 1466