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 fetch_info("resolving host = %s service = %s af = %d", 287 host, service, af); 288 memset(&hints, 0, sizeof(hints)); 289 hints.ai_family = af; 290 hints.ai_socktype = SOCK_STREAM; 291 hints.ai_flags = AI_ADDRCONFIG; 292 if ((err = getaddrinfo(host, service, &hints, &res)) != 0) { 293 netdb_seterr(err); 294 fetch_info("getaddrinfo() failed: %s", gai_strerror(err)); 295 return (NULL); 296 } 297 fetch_info("getaddrinfo() succeeded %p", res); 298 return (res); 299 } 300 301 302 303 /* 304 * Bind a socket to a specific local address 305 */ 306 int 307 fetch_bind(int sd, int af, const char *addr) 308 { 309 struct addrinfo *cliai, *ai; 310 int err; 311 312 if ((cliai = fetch_resolve(addr, 0, af)) == NULL) 313 return (-1); 314 for (ai = cliai; ai != NULL; ai = ai->ai_next) 315 if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0) 316 break; 317 if (err != 0) 318 fetch_syserr(); 319 freeaddrinfo(cliai); 320 return (err == 0 ? 0 : -1); 321 } 322 323 324 /* 325 * Establish a TCP connection to the specified port on the specified host. 326 */ 327 conn_t * 328 fetch_connect(const char *host, int port, int af, int verbose) 329 { 330 struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai; 331 const char *bindaddr; 332 conn_t *conn = NULL; 333 int err = 0, sd = -1; 334 335 DEBUG(fprintf(stderr, "---> %s:%d\n", host, port)); 336 337 /* resolve server address */ 338 if (verbose) 339 fetch_info("resolving server address: %s:%d", host, port); 340 if ((sais = fetch_resolve(host, port, af)) == NULL) 341 goto fail; 342 fetch_info("resolved"); 343 344 /* resolve client address */ 345 bindaddr = getenv("FETCH_BIND_ADDRESS"); 346 if (bindaddr != NULL && *bindaddr != '\0') { 347 if (verbose) 348 fetch_info("resolving client address: %s", bindaddr); 349 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL) 350 goto fail; 351 } 352 353 /* try each server address in turn */ 354 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) { 355 /* open socket */ 356 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0) 357 goto syserr; 358 /* attempt to bind to client address */ 359 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) { 360 if (cai->ai_family != sai->ai_family) 361 continue; 362 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0) 363 break; 364 } 365 if (err != 0) { 366 if (verbose) 367 fetch_info("failed to bind to %s", bindaddr); 368 goto syserr; 369 } 370 /* attempt to connect to server address */ 371 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0) 372 break; 373 /* clean up before next attempt */ 374 close(sd); 375 sd = -1; 376 } 377 if (err != 0) { 378 if (verbose) 379 fetch_info("failed to connect to %s:%s", host, port); 380 goto syserr; 381 } 382 383 if ((conn = fetch_reopen(sd)) == NULL) 384 goto syserr; 385 if (cais != NULL) 386 freeaddrinfo(cais); 387 if (sais != NULL) 388 freeaddrinfo(sais); 389 return (conn); 390 syserr: 391 fetch_syserr(); 392 goto fail; 393 fail: 394 if (sd >= 0) 395 close(sd); 396 if (cais != NULL) 397 freeaddrinfo(cais); 398 if (sais != NULL) 399 freeaddrinfo(sais); 400 return (NULL); 401 } 402 403 #ifdef WITH_SSL 404 /* 405 * Convert characters A-Z to lowercase (intentionally avoid any locale 406 * specific conversions). 407 */ 408 static char 409 fetch_ssl_tolower(char in) 410 { 411 if (in >= 'A' && in <= 'Z') 412 return (in + 32); 413 else 414 return (in); 415 } 416 417 /* 418 * isalpha implementation that intentionally avoids any locale specific 419 * conversions. 420 */ 421 static int 422 fetch_ssl_isalpha(char in) 423 { 424 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 425 } 426 427 /* 428 * Check if passed hostnames a and b are equal. 429 */ 430 static int 431 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 432 size_t blen) 433 { 434 size_t i; 435 436 if (alen != blen) 437 return (0); 438 for (i = 0; i < alen; ++i) { 439 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 440 return (0); 441 } 442 return (1); 443 } 444 445 /* 446 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 447 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 448 * numeric characters. Double hyphens (like they're found in IDN a-labels 449 * 'xn--') are not allowed. Empty labels are invalid. 450 */ 451 static int 452 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 453 { 454 size_t i; 455 456 if (!len || l[0] == '-' || l[len-1] == '-') 457 return (0); 458 for (i = 0; i < len; ++i) { 459 if (!isdigit(l[i]) && 460 !fetch_ssl_isalpha(l[i]) && 461 !(l[i] == '*' && wcok) && 462 !(l[i] == '-' && l[i - 1] != '-')) 463 return (0); 464 } 465 return (1); 466 } 467 468 /* 469 * Check if host name consists only of numbers. This might indicate an IP 470 * address, which is not a good idea for CN wildcard comparison. 471 */ 472 static int 473 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 474 { 475 size_t i; 476 477 for (i = 0; i < len; ++i) { 478 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 479 hostname[i] == '.')) 480 return (0); 481 } 482 return (1); 483 } 484 485 /* 486 * Check if the host name h passed matches the pattern passed in m which 487 * is usually part of subjectAltName or CN of a certificate presented to 488 * the client. This includes wildcard matching. The algorithm is based on 489 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 490 */ 491 static int 492 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 493 size_t mlen) 494 { 495 int delta, hdotidx, mdot1idx, wcidx; 496 const char *hdot, *mdot1, *mdot2; 497 const char *wc; /* wildcard */ 498 499 if (!(h && *h && m && *m)) 500 return (0); 501 if ((wc = strnstr(m, "*", mlen)) == NULL) 502 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 503 wcidx = wc - m; 504 /* hostname should not be just dots and numbers */ 505 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 506 return (0); 507 /* only one wildcard allowed in pattern */ 508 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 509 return (0); 510 /* 511 * there must be at least two more domain labels and 512 * wildcard has to be in the leftmost label (RFC6125) 513 */ 514 mdot1 = strnstr(m, ".", mlen); 515 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 516 return (0); 517 mdot1idx = mdot1 - m; 518 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 519 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 520 return (0); 521 /* hostname must contain a dot and not be the 1st char */ 522 hdot = strnstr(h, ".", hlen); 523 if (hdot == NULL || hdot == h) 524 return (0); 525 hdotidx = hdot - h; 526 /* 527 * host part of hostname must be at least as long as 528 * pattern it's supposed to match 529 */ 530 if (hdotidx < mdot1idx) 531 return (0); 532 /* 533 * don't allow wildcards in non-traditional domain names 534 * (IDN, A-label, U-label...) 535 */ 536 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 537 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 538 return (0); 539 /* match domain part (part after first dot) */ 540 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 541 mlen - mdot1idx)) 542 return (0); 543 /* match part left of wildcard */ 544 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 545 return (0); 546 /* match part right of wildcard */ 547 delta = mdot1idx - wcidx - 1; 548 if (!fetch_ssl_hname_equal(hdot - delta, delta, 549 mdot1 - delta, delta)) 550 return (0); 551 /* all tests succeeded, it's a match */ 552 return (1); 553 } 554 555 /* 556 * Get numeric host address info - returns NULL if host was not an IP 557 * address. The caller is responsible for deallocation using 558 * freeaddrinfo(3). 559 */ 560 static struct addrinfo * 561 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 562 { 563 struct addrinfo hints, *res; 564 char *host; 565 566 host = (char *)malloc(len + 1); 567 memcpy(host, hostname, len); 568 host[len] = '\0'; 569 memset(&hints, 0, sizeof(hints)); 570 hints.ai_family = PF_UNSPEC; 571 hints.ai_socktype = SOCK_STREAM; 572 hints.ai_protocol = 0; 573 hints.ai_flags = AI_NUMERICHOST; 574 /* port is not relevant for this purpose */ 575 if (getaddrinfo(host, "443", &hints, &res) != 0) 576 res = NULL; 577 free(host); 578 return res; 579 } 580 581 /* 582 * Compare ip address in addrinfo with address passes. 583 */ 584 static int 585 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 586 size_t rhostlen) 587 { 588 const void *left; 589 590 if (lhost->ai_family == AF_INET && rhostlen == 4) { 591 left = (void *)&((struct sockaddr_in*)(void *) 592 lhost->ai_addr)->sin_addr.s_addr; 593 #ifdef INET6 594 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 595 left = (void *)&((struct sockaddr_in6 *)(void *) 596 lhost->ai_addr)->sin6_addr; 597 #endif 598 } else 599 return (0); 600 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 601 } 602 603 /* 604 * Compare ip address in addrinfo with host passed. If host is not an IP 605 * address, comparison will fail. 606 */ 607 static int 608 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 609 size_t rlen) 610 { 611 struct addrinfo *raddr; 612 int ret; 613 char *rip; 614 615 ret = 0; 616 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 617 return 0; /* not a numeric host */ 618 619 if (laddr->ai_family == raddr->ai_family) { 620 if (laddr->ai_family == AF_INET) { 621 rip = (char *)&((struct sockaddr_in *)(void *) 622 raddr->ai_addr)->sin_addr.s_addr; 623 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 624 #ifdef INET6 625 } else if (laddr->ai_family == AF_INET6) { 626 rip = (char *)&((struct sockaddr_in6 *)(void *) 627 raddr->ai_addr)->sin6_addr; 628 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 629 #endif 630 } 631 632 } 633 freeaddrinfo(raddr); 634 return (ret); 635 } 636 637 /* 638 * Verify server certificate by subjectAltName. 639 */ 640 static int 641 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 642 const char *host, struct addrinfo *ip) 643 { 644 const GENERAL_NAME *name; 645 size_t nslen; 646 int i; 647 const char *ns; 648 649 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 650 #if OPENSSL_VERSION_NUMBER < 0x10000000L 651 /* 652 * This is a workaround, since the following line causes 653 * alignment issues in clang: 654 * name = sk_GENERAL_NAME_value(altnames, i); 655 * OpenSSL explicitly warns not to use those macros 656 * directly, but there isn't much choice (and there 657 * shouldn't be any ill side effects) 658 */ 659 name = (GENERAL_NAME *)SKM_sk_value(void, altnames, i); 660 #else 661 name = sk_GENERAL_NAME_value(altnames, i); 662 #endif 663 ns = (const char *)ASN1_STRING_data(name->d.ia5); 664 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 665 666 if (name->type == GEN_DNS && ip == NULL && 667 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 668 return (1); 669 else if (name->type == GEN_IPADD && ip != NULL && 670 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 671 return (1); 672 } 673 return (0); 674 } 675 676 /* 677 * Verify server certificate by CN. 678 */ 679 static int 680 fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 681 struct addrinfo *ip) 682 { 683 ASN1_STRING *namedata; 684 X509_NAME_ENTRY *nameentry; 685 int cnlen, lastpos, loc, ret; 686 unsigned char *cn; 687 688 ret = 0; 689 lastpos = -1; 690 loc = -1; 691 cn = NULL; 692 /* get most specific CN (last entry in list) and compare */ 693 while ((lastpos = X509_NAME_get_index_by_NID(subject, 694 NID_commonName, lastpos)) != -1) 695 loc = lastpos; 696 697 if (loc > -1) { 698 nameentry = X509_NAME_get_entry(subject, loc); 699 namedata = X509_NAME_ENTRY_get_data(nameentry); 700 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 701 if (ip == NULL && 702 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 703 ret = 1; 704 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 705 ret = 1; 706 OPENSSL_free(cn); 707 } 708 return (ret); 709 } 710 711 /* 712 * Verify that server certificate subjectAltName/CN matches 713 * hostname. First check, if there are alternative subject names. If yes, 714 * those have to match. Only if those don't exist it falls back to 715 * checking the subject's CN. 716 */ 717 static int 718 fetch_ssl_verify_hname(X509 *cert, const char *host) 719 { 720 struct addrinfo *ip; 721 STACK_OF(GENERAL_NAME) *altnames; 722 X509_NAME *subject; 723 int ret; 724 725 ret = 0; 726 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 727 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 728 NULL, NULL); 729 730 if (altnames != NULL) { 731 ret = fetch_ssl_verify_altname(altnames, host, ip); 732 } else { 733 subject = X509_get_subject_name(cert); 734 if (subject != NULL) 735 ret = fetch_ssl_verify_cn(subject, host, ip); 736 } 737 738 if (ip != NULL) 739 freeaddrinfo(ip); 740 if (altnames != NULL) 741 GENERAL_NAMES_free(altnames); 742 return (ret); 743 } 744 745 /* 746 * Configure transport security layer based on environment. 747 */ 748 static void 749 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 750 { 751 long ssl_ctx_options; 752 753 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET; 754 if (getenv("SSL_ALLOW_SSL3") == NULL) 755 ssl_ctx_options |= SSL_OP_NO_SSLv3; 756 if (getenv("SSL_NO_TLS1") != NULL) 757 ssl_ctx_options |= SSL_OP_NO_TLSv1; 758 if (getenv("SSL_NO_TLS1_1") != NULL) 759 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 760 if (getenv("SSL_NO_TLS1_2") != NULL) 761 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 762 if (verbose) 763 fetch_info("SSL options: %lx", ssl_ctx_options); 764 SSL_CTX_set_options(ctx, ssl_ctx_options); 765 } 766 767 768 /* 769 * Configure peer verification based on environment. 770 */ 771 #define LOCAL_CERT_FILE "/usr/local/etc/ssl/cert.pem" 772 #define BASE_CERT_FILE "/etc/ssl/cert.pem" 773 static int 774 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 775 { 776 X509_LOOKUP *crl_lookup; 777 X509_STORE *crl_store; 778 const char *ca_cert_file, *ca_cert_path, *crl_file; 779 780 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 781 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 782 if (ca_cert_file == NULL && 783 access(LOCAL_CERT_FILE, R_OK) == 0) 784 ca_cert_file = LOCAL_CERT_FILE; 785 if (ca_cert_file == NULL && 786 access(BASE_CERT_FILE, R_OK) == 0) 787 ca_cert_file = BASE_CERT_FILE; 788 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 789 if (verbose) { 790 fetch_info("Peer verification enabled"); 791 if (ca_cert_file != NULL) 792 fetch_info("Using CA cert file: %s", 793 ca_cert_file); 794 if (ca_cert_path != NULL) 795 fetch_info("Using CA cert path: %s", 796 ca_cert_path); 797 if (ca_cert_file == NULL && ca_cert_path == NULL) 798 fetch_info("Using OpenSSL default " 799 "CA cert file and path"); 800 } 801 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 802 fetch_ssl_cb_verify_crt); 803 if (ca_cert_file != NULL || ca_cert_path != NULL) 804 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 805 ca_cert_path); 806 else 807 SSL_CTX_set_default_verify_paths(ctx); 808 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 809 if (verbose) 810 fetch_info("Using CRL file: %s", crl_file); 811 crl_store = SSL_CTX_get_cert_store(ctx); 812 crl_lookup = X509_STORE_add_lookup(crl_store, 813 X509_LOOKUP_file()); 814 if (crl_lookup == NULL || 815 !X509_load_crl_file(crl_lookup, crl_file, 816 X509_FILETYPE_PEM)) { 817 fprintf(stderr, 818 "Could not load CRL file %s\n", 819 crl_file); 820 return (0); 821 } 822 X509_STORE_set_flags(crl_store, 823 X509_V_FLAG_CRL_CHECK | 824 X509_V_FLAG_CRL_CHECK_ALL); 825 } 826 } 827 return (1); 828 } 829 830 /* 831 * Configure client certificate based on environment. 832 */ 833 static int 834 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 835 { 836 const char *client_cert_file, *client_key_file; 837 838 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 839 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 840 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 841 if (verbose) { 842 fetch_info("Using client cert file: %s", 843 client_cert_file); 844 fetch_info("Using client key file: %s", 845 client_key_file); 846 } 847 if (SSL_CTX_use_certificate_chain_file(ctx, 848 client_cert_file) != 1) { 849 fprintf(stderr, 850 "Could not load client certificate %s\n", 851 client_cert_file); 852 return (0); 853 } 854 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 855 SSL_FILETYPE_PEM) != 1) { 856 fprintf(stderr, 857 "Could not load client key %s\n", 858 client_key_file); 859 return (0); 860 } 861 } 862 return (1); 863 } 864 865 /* 866 * Callback for SSL certificate verification, this is called on server 867 * cert verification. It takes no decision, but informs the user in case 868 * verification failed. 869 */ 870 int 871 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 872 { 873 X509 *crt; 874 X509_NAME *name; 875 char *str; 876 877 str = NULL; 878 if (!verified) { 879 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 880 (name = X509_get_subject_name(crt)) != NULL) 881 str = X509_NAME_oneline(name, 0, 0); 882 fprintf(stderr, "Certificate verification failed for %s\n", 883 str != NULL ? str : "no relevant certificate"); 884 OPENSSL_free(str); 885 } 886 return (verified); 887 } 888 889 #endif 890 891 /* 892 * Enable SSL on a connection. 893 */ 894 int 895 fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 896 { 897 #ifdef WITH_SSL 898 int ret, ssl_err; 899 X509_NAME *name; 900 char *str; 901 902 /* Init the SSL library and context */ 903 if (!SSL_library_init()){ 904 fprintf(stderr, "SSL library init failed\n"); 905 return (-1); 906 } 907 908 SSL_load_error_strings(); 909 910 conn->ssl_meth = SSLv23_client_method(); 911 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 912 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 913 914 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 915 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 916 return (-1); 917 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 918 return (-1); 919 920 conn->ssl = SSL_new(conn->ssl_ctx); 921 if (conn->ssl == NULL) { 922 fprintf(stderr, "SSL context creation failed\n"); 923 return (-1); 924 } 925 SSL_set_fd(conn->ssl, conn->sd); 926 927 #if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT) 928 if (!SSL_set_tlsext_host_name(conn->ssl, 929 __DECONST(struct url *, URL)->host)) { 930 fprintf(stderr, 931 "TLS server name indication extension failed for host %s\n", 932 URL->host); 933 return (-1); 934 } 935 #endif 936 while ((ret = SSL_connect(conn->ssl)) == -1) { 937 ssl_err = SSL_get_error(conn->ssl, ret); 938 if (ssl_err != SSL_ERROR_WANT_READ && 939 ssl_err != SSL_ERROR_WANT_WRITE) { 940 ERR_print_errors_fp(stderr); 941 return (-1); 942 } 943 } 944 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 945 946 if (conn->ssl_cert == NULL) { 947 fprintf(stderr, "No server SSL certificate\n"); 948 return (-1); 949 } 950 951 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 952 if (verbose) 953 fetch_info("Verify hostname"); 954 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 955 fprintf(stderr, 956 "SSL certificate subject doesn't match host %s\n", 957 URL->host); 958 return (-1); 959 } 960 } 961 962 if (verbose) { 963 fetch_info("%s connection established using %s", 964 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 965 name = X509_get_subject_name(conn->ssl_cert); 966 str = X509_NAME_oneline(name, 0, 0); 967 fetch_info("Certificate subject: %s", str); 968 OPENSSL_free(str); 969 name = X509_get_issuer_name(conn->ssl_cert); 970 str = X509_NAME_oneline(name, 0, 0); 971 fetch_info("Certificate issuer: %s", str); 972 OPENSSL_free(str); 973 } 974 975 return (0); 976 #else 977 (void)conn; 978 (void)verbose; 979 fprintf(stderr, "SSL support disabled\n"); 980 return (-1); 981 #endif 982 } 983 984 #define FETCH_READ_WAIT -2 985 #define FETCH_READ_ERROR -1 986 #define FETCH_READ_DONE 0 987 988 #ifdef WITH_SSL 989 static ssize_t 990 fetch_ssl_read(SSL *ssl, char *buf, size_t len) 991 { 992 ssize_t rlen; 993 int ssl_err; 994 995 rlen = SSL_read(ssl, buf, len); 996 if (rlen < 0) { 997 ssl_err = SSL_get_error(ssl, rlen); 998 if (ssl_err == SSL_ERROR_WANT_READ || 999 ssl_err == SSL_ERROR_WANT_WRITE) { 1000 return (FETCH_READ_WAIT); 1001 } else { 1002 ERR_print_errors_fp(stderr); 1003 return (FETCH_READ_ERROR); 1004 } 1005 } 1006 return (rlen); 1007 } 1008 #endif 1009 1010 static ssize_t 1011 fetch_socket_read(int sd, char *buf, size_t len) 1012 { 1013 ssize_t rlen; 1014 1015 rlen = read(sd, buf, len); 1016 if (rlen < 0) { 1017 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 1018 return (FETCH_READ_WAIT); 1019 else 1020 return (FETCH_READ_ERROR); 1021 } 1022 return (rlen); 1023 } 1024 1025 /* 1026 * Read a character from a connection w/ timeout 1027 */ 1028 ssize_t 1029 fetch_read(conn_t *conn, char *buf, size_t len) 1030 { 1031 struct timeval now, timeout, delta; 1032 struct pollfd pfd; 1033 ssize_t rlen; 1034 int deltams; 1035 1036 if (fetchTimeout > 0) { 1037 gettimeofday(&timeout, NULL); 1038 timeout.tv_sec += fetchTimeout; 1039 } 1040 1041 deltams = INFTIM; 1042 memset(&pfd, 0, sizeof pfd); 1043 pfd.fd = conn->sd; 1044 pfd.events = POLLIN | POLLERR; 1045 1046 for (;;) { 1047 /* 1048 * The socket is non-blocking. Instead of the canonical 1049 * poll() -> read(), we do the following: 1050 * 1051 * 1) call read() or SSL_read(). 1052 * 2) if we received some data, return it. 1053 * 3) if an error occurred, return -1. 1054 * 4) if read() or SSL_read() signaled EOF, return. 1055 * 5) if we did not receive any data but we're not at EOF, 1056 * call poll(). 1057 * 1058 * In the SSL case, this is necessary because if we 1059 * receive a close notification, we have to call 1060 * SSL_read() one additional time after we've read 1061 * everything we received. 1062 * 1063 * In the non-SSL case, it may improve performance (very 1064 * slightly) when reading small amounts of data. 1065 */ 1066 #ifdef WITH_SSL 1067 if (conn->ssl != NULL) 1068 rlen = fetch_ssl_read(conn->ssl, buf, len); 1069 else 1070 #endif 1071 rlen = fetch_socket_read(conn->sd, buf, len); 1072 if (rlen >= 0) { 1073 break; 1074 } else if (rlen == FETCH_READ_ERROR) { 1075 fetch_syserr(); 1076 return (-1); 1077 } 1078 // assert(rlen == FETCH_READ_WAIT); 1079 if (fetchTimeout > 0) { 1080 gettimeofday(&now, NULL); 1081 if (!timercmp(&timeout, &now, >)) { 1082 errno = ETIMEDOUT; 1083 fetch_syserr(); 1084 return (-1); 1085 } 1086 timersub(&timeout, &now, &delta); 1087 deltams = delta.tv_sec * 1000 + 1088 delta.tv_usec / 1000;; 1089 } 1090 errno = 0; 1091 pfd.revents = 0; 1092 if (poll(&pfd, 1, deltams) < 0) { 1093 if (errno == EINTR && fetchRestartCalls) 1094 continue; 1095 fetch_syserr(); 1096 return (-1); 1097 } 1098 } 1099 return (rlen); 1100 } 1101 1102 1103 /* 1104 * Read a line of text from a connection w/ timeout 1105 */ 1106 #define MIN_BUF_SIZE 1024 1107 1108 int 1109 fetch_getln(conn_t *conn) 1110 { 1111 char *tmp; 1112 size_t tmpsize; 1113 ssize_t len; 1114 char c; 1115 1116 if (conn->buf == NULL) { 1117 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 1118 errno = ENOMEM; 1119 return (-1); 1120 } 1121 conn->bufsize = MIN_BUF_SIZE; 1122 } 1123 1124 conn->buf[0] = '\0'; 1125 conn->buflen = 0; 1126 1127 do { 1128 len = fetch_read(conn, &c, 1); 1129 if (len == -1) 1130 return (-1); 1131 if (len == 0) 1132 break; 1133 conn->buf[conn->buflen++] = c; 1134 if (conn->buflen == conn->bufsize) { 1135 tmp = conn->buf; 1136 tmpsize = conn->bufsize * 2 + 1; 1137 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 1138 errno = ENOMEM; 1139 return (-1); 1140 } 1141 conn->buf = tmp; 1142 conn->bufsize = tmpsize; 1143 } 1144 } while (c != '\n'); 1145 1146 conn->buf[conn->buflen] = '\0'; 1147 DEBUG(fprintf(stderr, "<<< %s", conn->buf)); 1148 return (0); 1149 } 1150 1151 1152 /* 1153 * Write to a connection w/ timeout 1154 */ 1155 ssize_t 1156 fetch_write(conn_t *conn, const char *buf, size_t len) 1157 { 1158 struct iovec iov; 1159 1160 iov.iov_base = __DECONST(char *, buf); 1161 iov.iov_len = len; 1162 return fetch_writev(conn, &iov, 1); 1163 } 1164 1165 /* 1166 * Write a vector to a connection w/ timeout 1167 * Note: can modify the iovec. 1168 */ 1169 ssize_t 1170 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1171 { 1172 struct timeval now, timeout, delta; 1173 struct pollfd pfd; 1174 ssize_t wlen, total; 1175 int deltams; 1176 1177 memset(&pfd, 0, sizeof pfd); 1178 if (fetchTimeout) { 1179 pfd.fd = conn->sd; 1180 pfd.events = POLLOUT | POLLERR; 1181 gettimeofday(&timeout, NULL); 1182 timeout.tv_sec += fetchTimeout; 1183 } 1184 1185 total = 0; 1186 while (iovcnt > 0) { 1187 while (fetchTimeout && pfd.revents == 0) { 1188 gettimeofday(&now, NULL); 1189 if (!timercmp(&timeout, &now, >)) { 1190 errno = ETIMEDOUT; 1191 fetch_syserr(); 1192 return (-1); 1193 } 1194 timersub(&timeout, &now, &delta); 1195 deltams = delta.tv_sec * 1000 + 1196 delta.tv_usec / 1000; 1197 errno = 0; 1198 pfd.revents = 0; 1199 if (poll(&pfd, 1, deltams) < 0) { 1200 /* POSIX compliance */ 1201 if (errno == EAGAIN) 1202 continue; 1203 if (errno == EINTR && fetchRestartCalls) 1204 continue; 1205 return (-1); 1206 } 1207 } 1208 errno = 0; 1209 #ifdef WITH_SSL 1210 if (conn->ssl != NULL) 1211 wlen = SSL_write(conn->ssl, 1212 iov->iov_base, iov->iov_len); 1213 else 1214 #endif 1215 wlen = writev(conn->sd, iov, iovcnt); 1216 if (wlen == 0) { 1217 /* we consider a short write a failure */ 1218 /* XXX perhaps we shouldn't in the SSL case */ 1219 errno = EPIPE; 1220 fetch_syserr(); 1221 return (-1); 1222 } 1223 if (wlen < 0) { 1224 if (errno == EINTR && fetchRestartCalls) 1225 continue; 1226 return (-1); 1227 } 1228 total += wlen; 1229 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1230 wlen -= iov->iov_len; 1231 iov++; 1232 iovcnt--; 1233 } 1234 if (iovcnt > 0) { 1235 iov->iov_len -= wlen; 1236 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1237 } 1238 } 1239 return (total); 1240 } 1241 1242 1243 /* 1244 * Write a line of text to a connection w/ timeout 1245 */ 1246 int 1247 fetch_putln(conn_t *conn, const char *str, size_t len) 1248 { 1249 struct iovec iov[2]; 1250 int ret; 1251 1252 DEBUG(fprintf(stderr, ">>> %s\n", str)); 1253 iov[0].iov_base = __DECONST(char *, str); 1254 iov[0].iov_len = len; 1255 iov[1].iov_base = __DECONST(char *, ENDL); 1256 iov[1].iov_len = sizeof(ENDL); 1257 if (len == 0) 1258 ret = fetch_writev(conn, &iov[1], 1); 1259 else 1260 ret = fetch_writev(conn, iov, 2); 1261 if (ret == -1) 1262 return (-1); 1263 return (0); 1264 } 1265 1266 1267 /* 1268 * Close connection 1269 */ 1270 int 1271 fetch_close(conn_t *conn) 1272 { 1273 int ret; 1274 1275 if (--conn->ref > 0) 1276 return (0); 1277 #ifdef WITH_SSL 1278 if (conn->ssl) { 1279 SSL_shutdown(conn->ssl); 1280 SSL_set_connect_state(conn->ssl); 1281 SSL_free(conn->ssl); 1282 conn->ssl = NULL; 1283 } 1284 if (conn->ssl_ctx) { 1285 SSL_CTX_free(conn->ssl_ctx); 1286 conn->ssl_ctx = NULL; 1287 } 1288 if (conn->ssl_cert) { 1289 X509_free(conn->ssl_cert); 1290 conn->ssl_cert = NULL; 1291 } 1292 #endif 1293 ret = close(conn->sd); 1294 free(conn->buf); 1295 free(conn); 1296 return (ret); 1297 } 1298 1299 1300 /*** Directory-related utility functions *************************************/ 1301 1302 int 1303 fetch_add_entry(struct url_ent **p, int *size, int *len, 1304 const char *name, struct url_stat *us) 1305 { 1306 struct url_ent *tmp; 1307 1308 if (*p == NULL) { 1309 *size = 0; 1310 *len = 0; 1311 } 1312 1313 if (*len >= *size - 1) { 1314 tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p)); 1315 if (tmp == NULL) { 1316 errno = ENOMEM; 1317 fetch_syserr(); 1318 return (-1); 1319 } 1320 *size = (*size * 2 + 1); 1321 *p = tmp; 1322 } 1323 1324 tmp = *p + *len; 1325 snprintf(tmp->name, PATH_MAX, "%s", name); 1326 memcpy(&tmp->stat, us, sizeof(*us)); 1327 1328 (*len)++; 1329 (++tmp)->name[0] = 0; 1330 1331 return (0); 1332 } 1333 1334 1335 /*** Authentication-related utility functions ********************************/ 1336 1337 static const char * 1338 fetch_read_word(FILE *f) 1339 { 1340 static char word[1024]; 1341 1342 if (fscanf(f, " %1023s ", word) != 1) 1343 return (NULL); 1344 return (word); 1345 } 1346 1347 /* 1348 * Get authentication data for a URL from .netrc 1349 */ 1350 int 1351 fetch_netrc_auth(struct url *url) 1352 { 1353 char fn[PATH_MAX]; 1354 const char *word; 1355 char *p; 1356 FILE *f; 1357 1358 if ((p = getenv("NETRC")) != NULL) { 1359 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1360 fetch_info("$NETRC specifies a file name " 1361 "longer than PATH_MAX"); 1362 return (-1); 1363 } 1364 } else { 1365 if ((p = getenv("HOME")) != NULL) { 1366 struct passwd *pwd; 1367 1368 if ((pwd = getpwuid(getuid())) == NULL || 1369 (p = pwd->pw_dir) == NULL) 1370 return (-1); 1371 } 1372 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1373 return (-1); 1374 } 1375 1376 if ((f = fopen(fn, "r")) == NULL) 1377 return (-1); 1378 while ((word = fetch_read_word(f)) != NULL) { 1379 if (strcmp(word, "default") == 0) { 1380 DEBUG(fetch_info("Using default .netrc settings")); 1381 break; 1382 } 1383 if (strcmp(word, "machine") == 0 && 1384 (word = fetch_read_word(f)) != NULL && 1385 strcasecmp(word, url->host) == 0) { 1386 DEBUG(fetch_info("Using .netrc settings for %s", word)); 1387 break; 1388 } 1389 } 1390 if (word == NULL) 1391 goto ferr; 1392 while ((word = fetch_read_word(f)) != NULL) { 1393 if (strcmp(word, "login") == 0) { 1394 if ((word = fetch_read_word(f)) == NULL) 1395 goto ferr; 1396 if (snprintf(url->user, sizeof(url->user), 1397 "%s", word) > (int)sizeof(url->user)) { 1398 fetch_info("login name in .netrc is too long"); 1399 url->user[0] = '\0'; 1400 } 1401 } else if (strcmp(word, "password") == 0) { 1402 if ((word = fetch_read_word(f)) == NULL) 1403 goto ferr; 1404 if (snprintf(url->pwd, sizeof(url->pwd), 1405 "%s", word) > (int)sizeof(url->pwd)) { 1406 fetch_info("password in .netrc is too long"); 1407 url->pwd[0] = '\0'; 1408 } 1409 } else if (strcmp(word, "account") == 0) { 1410 if ((word = fetch_read_word(f)) == NULL) 1411 goto ferr; 1412 /* XXX not supported! */ 1413 } else { 1414 break; 1415 } 1416 } 1417 fclose(f); 1418 return (0); 1419 ferr: 1420 fclose(f); 1421 return (-1); 1422 } 1423 1424 /* 1425 * The no_proxy environment variable specifies a set of domains for 1426 * which the proxy should not be consulted; the contents is a comma-, 1427 * or space-separated list of domain names. A single asterisk will 1428 * override all proxy variables and no transactions will be proxied 1429 * (for compatibility with lynx and curl, see the discussion at 1430 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1431 */ 1432 int 1433 fetch_no_proxy_match(const char *host) 1434 { 1435 const char *no_proxy, *p, *q; 1436 size_t h_len, d_len; 1437 1438 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1439 (no_proxy = getenv("no_proxy")) == NULL) 1440 return (0); 1441 1442 /* asterisk matches any hostname */ 1443 if (strcmp(no_proxy, "*") == 0) 1444 return (1); 1445 1446 h_len = strlen(host); 1447 p = no_proxy; 1448 do { 1449 /* position p at the beginning of a domain suffix */ 1450 while (*p == ',' || isspace((unsigned char)*p)) 1451 p++; 1452 1453 /* position q at the first separator character */ 1454 for (q = p; *q; ++q) 1455 if (*q == ',' || isspace((unsigned char)*q)) 1456 break; 1457 1458 d_len = q - p; 1459 if (d_len > 0 && h_len >= d_len && 1460 strncasecmp(host + h_len - d_len, 1461 p, d_len) == 0) { 1462 /* domain name matches */ 1463 return (1); 1464 } 1465 1466 p = q + 1; 1467 } while (*q); 1468 1469 return (0); 1470 } 1471