1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1998-2016 Dag-Erling Smørgrav 5 * Copyright (c) 2013 Michael Gmelin <freebsd@grem.de> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer 13 * in this position and unchanged. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/socket.h> 37 #include <sys/time.h> 38 #include <sys/uio.h> 39 40 #include <netinet/in.h> 41 42 #include <ctype.h> 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <netdb.h> 46 #include <poll.h> 47 #include <pwd.h> 48 #include <stdarg.h> 49 #include <stdlib.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #ifdef WITH_SSL 55 #include <openssl/x509v3.h> 56 #endif 57 58 #include "fetch.h" 59 #include "common.h" 60 61 62 /*** Local data **************************************************************/ 63 64 /* 65 * Error messages for resolver errors 66 */ 67 static struct fetcherr netdb_errlist[] = { 68 #ifdef EAI_NODATA 69 { EAI_NODATA, FETCH_RESOLV, "Host not found" }, 70 #endif 71 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 72 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 73 { EAI_NONAME, FETCH_RESOLV, "No address record" }, 74 { -1, FETCH_UNKNOWN, "Unknown resolver error" } 75 }; 76 77 /* End-of-Line */ 78 static const char ENDL[2] = "\r\n"; 79 80 81 /*** Error-reporting functions ***********************************************/ 82 83 /* 84 * Map error code to string 85 */ 86 static struct fetcherr * 87 fetch_finderr(struct fetcherr *p, int e) 88 { 89 while (p->num != -1 && p->num != e) 90 p++; 91 return (p); 92 } 93 94 /* 95 * Set error code 96 */ 97 void 98 fetch_seterr(struct fetcherr *p, int e) 99 { 100 p = fetch_finderr(p, e); 101 fetchLastErrCode = p->cat; 102 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 103 } 104 105 /* 106 * Set error code according to errno 107 */ 108 void 109 fetch_syserr(void) 110 { 111 switch (errno) { 112 case 0: 113 fetchLastErrCode = FETCH_OK; 114 break; 115 case EPERM: 116 case EACCES: 117 case EROFS: 118 case EAUTH: 119 case ENEEDAUTH: 120 fetchLastErrCode = FETCH_AUTH; 121 break; 122 case ENOENT: 123 case EISDIR: /* XXX */ 124 fetchLastErrCode = FETCH_UNAVAIL; 125 break; 126 case ENOMEM: 127 fetchLastErrCode = FETCH_MEMORY; 128 break; 129 case EBUSY: 130 case EAGAIN: 131 fetchLastErrCode = FETCH_TEMP; 132 break; 133 case EEXIST: 134 fetchLastErrCode = FETCH_EXISTS; 135 break; 136 case ENOSPC: 137 fetchLastErrCode = FETCH_FULL; 138 break; 139 case EADDRINUSE: 140 case EADDRNOTAVAIL: 141 case ENETDOWN: 142 case ENETUNREACH: 143 case ENETRESET: 144 case EHOSTUNREACH: 145 fetchLastErrCode = FETCH_NETWORK; 146 break; 147 case ECONNABORTED: 148 case ECONNRESET: 149 fetchLastErrCode = FETCH_ABORT; 150 break; 151 case ETIMEDOUT: 152 fetchLastErrCode = FETCH_TIMEOUT; 153 break; 154 case ECONNREFUSED: 155 case EHOSTDOWN: 156 fetchLastErrCode = FETCH_DOWN; 157 break; 158 default: 159 fetchLastErrCode = FETCH_UNKNOWN; 160 } 161 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); 162 } 163 164 165 /* 166 * Emit status message 167 */ 168 void 169 fetch_info(const char *fmt, ...) 170 { 171 va_list ap; 172 173 va_start(ap, fmt); 174 vfprintf(stderr, fmt, ap); 175 va_end(ap); 176 fputc('\n', stderr); 177 } 178 179 180 /*** Network-related utility functions ***************************************/ 181 182 /* 183 * Return the default port for a scheme 184 */ 185 int 186 fetch_default_port(const char *scheme) 187 { 188 struct servent *se; 189 190 if ((se = getservbyname(scheme, "tcp")) != NULL) 191 return (ntohs(se->s_port)); 192 if (strcasecmp(scheme, SCHEME_FTP) == 0) 193 return (FTP_DEFAULT_PORT); 194 if (strcasecmp(scheme, SCHEME_HTTP) == 0) 195 return (HTTP_DEFAULT_PORT); 196 return (0); 197 } 198 199 /* 200 * Return the default proxy port for a scheme 201 */ 202 int 203 fetch_default_proxy_port(const char *scheme) 204 { 205 if (strcasecmp(scheme, SCHEME_FTP) == 0) 206 return (FTP_DEFAULT_PROXY_PORT); 207 if (strcasecmp(scheme, SCHEME_HTTP) == 0) 208 return (HTTP_DEFAULT_PROXY_PORT); 209 return (0); 210 } 211 212 213 /* 214 * Create a connection for an existing descriptor. 215 */ 216 conn_t * 217 fetch_reopen(int sd) 218 { 219 conn_t *conn; 220 int opt = 1; 221 222 /* allocate and fill connection structure */ 223 if ((conn = calloc(1, sizeof(*conn))) == NULL) 224 return (NULL); 225 fcntl(sd, F_SETFD, FD_CLOEXEC); 226 setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof opt); 227 conn->sd = sd; 228 ++conn->ref; 229 return (conn); 230 } 231 232 233 /* 234 * Bump a connection's reference count. 235 */ 236 conn_t * 237 fetch_ref(conn_t *conn) 238 { 239 240 ++conn->ref; 241 return (conn); 242 } 243 244 245 /* 246 * Resolve an address 247 */ 248 struct addrinfo * 249 fetch_resolve(const char *addr, int port, int af) 250 { 251 char hbuf[256], sbuf[8]; 252 struct addrinfo hints, *res; 253 const char *hb, *he, *sep; 254 const char *host, *service; 255 int err, len; 256 257 /* first, check for a bracketed IPv6 address */ 258 if (*addr == '[') { 259 hb = addr + 1; 260 if ((sep = strchr(hb, ']')) == NULL) { 261 errno = EINVAL; 262 goto syserr; 263 } 264 he = sep++; 265 } else { 266 hb = addr; 267 sep = strchrnul(hb, ':'); 268 he = sep; 269 } 270 271 /* see if we need to copy the host name */ 272 if (*he != '\0') { 273 len = snprintf(hbuf, sizeof(hbuf), 274 "%.*s", (int)(he - hb), hb); 275 if (len < 0) 276 goto syserr; 277 if (len >= (int)sizeof(hbuf)) { 278 errno = ENAMETOOLONG; 279 goto syserr; 280 } 281 host = hbuf; 282 } else { 283 host = hb; 284 } 285 286 /* was it followed by a service name? */ 287 if (*sep == '\0' && port != 0) { 288 if (port < 1 || port > 65535) { 289 errno = EINVAL; 290 goto syserr; 291 } 292 if (snprintf(sbuf, sizeof(sbuf), "%d", port) < 0) 293 goto syserr; 294 service = sbuf; 295 } else if (*sep != '\0') { 296 service = sep + 1; 297 } else { 298 service = NULL; 299 } 300 301 /* resolve */ 302 memset(&hints, 0, sizeof(hints)); 303 hints.ai_family = af; 304 hints.ai_socktype = SOCK_STREAM; 305 hints.ai_flags = AI_ADDRCONFIG; 306 if ((err = getaddrinfo(host, service, &hints, &res)) != 0) { 307 netdb_seterr(err); 308 return (NULL); 309 } 310 return (res); 311 syserr: 312 fetch_syserr(); 313 return (NULL); 314 } 315 316 317 318 /* 319 * Bind a socket to a specific local address 320 */ 321 int 322 fetch_bind(int sd, int af, const char *addr) 323 { 324 struct addrinfo *cliai, *ai; 325 int err; 326 327 if ((cliai = fetch_resolve(addr, 0, af)) == NULL) 328 return (-1); 329 for (ai = cliai; ai != NULL; ai = ai->ai_next) 330 if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0) 331 break; 332 if (err != 0) 333 fetch_syserr(); 334 freeaddrinfo(cliai); 335 return (err == 0 ? 0 : -1); 336 } 337 338 339 /* 340 * Establish a TCP connection to the specified port on the specified host. 341 */ 342 conn_t * 343 fetch_connect(const char *host, int port, int af, int verbose) 344 { 345 struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai; 346 const char *bindaddr; 347 conn_t *conn = NULL; 348 int err = 0, sd = -1; 349 350 DEBUG(fprintf(stderr, "---> %s:%d\n", host, port)); 351 352 /* resolve server address */ 353 if (verbose) 354 fetch_info("resolving server address: %s:%d", host, port); 355 if ((sais = fetch_resolve(host, port, af)) == NULL) 356 goto fail; 357 358 /* resolve client address */ 359 bindaddr = getenv("FETCH_BIND_ADDRESS"); 360 if (bindaddr != NULL && *bindaddr != '\0') { 361 if (verbose) 362 fetch_info("resolving client address: %s", bindaddr); 363 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL) 364 goto fail; 365 } 366 367 /* try each server address in turn */ 368 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) { 369 /* open socket */ 370 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0) 371 goto syserr; 372 /* attempt to bind to client address */ 373 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) { 374 if (cai->ai_family != sai->ai_family) 375 continue; 376 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0) 377 break; 378 } 379 if (err != 0) { 380 if (verbose) 381 fetch_info("failed to bind to %s", bindaddr); 382 goto syserr; 383 } 384 /* attempt to connect to server address */ 385 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0) 386 break; 387 /* clean up before next attempt */ 388 close(sd); 389 sd = -1; 390 } 391 if (err != 0) { 392 if (verbose) 393 fetch_info("failed to connect to %s:%d", host, port); 394 goto syserr; 395 } 396 397 if ((conn = fetch_reopen(sd)) == NULL) 398 goto syserr; 399 if (cais != NULL) 400 freeaddrinfo(cais); 401 if (sais != NULL) 402 freeaddrinfo(sais); 403 return (conn); 404 syserr: 405 fetch_syserr(); 406 goto fail; 407 fail: 408 if (sd >= 0) 409 close(sd); 410 if (cais != NULL) 411 freeaddrinfo(cais); 412 if (sais != NULL) 413 freeaddrinfo(sais); 414 return (NULL); 415 } 416 417 #ifdef WITH_SSL 418 /* 419 * Convert characters A-Z to lowercase (intentionally avoid any locale 420 * specific conversions). 421 */ 422 static char 423 fetch_ssl_tolower(char in) 424 { 425 if (in >= 'A' && in <= 'Z') 426 return (in + 32); 427 else 428 return (in); 429 } 430 431 /* 432 * isalpha implementation that intentionally avoids any locale specific 433 * conversions. 434 */ 435 static int 436 fetch_ssl_isalpha(char in) 437 { 438 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 439 } 440 441 /* 442 * Check if passed hostnames a and b are equal. 443 */ 444 static int 445 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 446 size_t blen) 447 { 448 size_t i; 449 450 if (alen != blen) 451 return (0); 452 for (i = 0; i < alen; ++i) { 453 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 454 return (0); 455 } 456 return (1); 457 } 458 459 /* 460 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 461 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 462 * numeric characters. Double hyphens (like they're found in IDN a-labels 463 * 'xn--') are not allowed. Empty labels are invalid. 464 */ 465 static int 466 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 467 { 468 size_t i; 469 470 if (!len || l[0] == '-' || l[len-1] == '-') 471 return (0); 472 for (i = 0; i < len; ++i) { 473 if (!isdigit(l[i]) && 474 !fetch_ssl_isalpha(l[i]) && 475 !(l[i] == '*' && wcok) && 476 !(l[i] == '-' && l[i - 1] != '-')) 477 return (0); 478 } 479 return (1); 480 } 481 482 /* 483 * Check if host name consists only of numbers. This might indicate an IP 484 * address, which is not a good idea for CN wildcard comparison. 485 */ 486 static int 487 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 488 { 489 size_t i; 490 491 for (i = 0; i < len; ++i) { 492 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 493 hostname[i] == '.')) 494 return (0); 495 } 496 return (1); 497 } 498 499 /* 500 * Check if the host name h passed matches the pattern passed in m which 501 * is usually part of subjectAltName or CN of a certificate presented to 502 * the client. This includes wildcard matching. The algorithm is based on 503 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 504 */ 505 static int 506 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 507 size_t mlen) 508 { 509 int delta, hdotidx, mdot1idx, wcidx; 510 const char *hdot, *mdot1, *mdot2; 511 const char *wc; /* wildcard */ 512 513 if (!(h && *h && m && *m)) 514 return (0); 515 if ((wc = strnstr(m, "*", mlen)) == NULL) 516 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 517 wcidx = wc - m; 518 /* hostname should not be just dots and numbers */ 519 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 520 return (0); 521 /* only one wildcard allowed in pattern */ 522 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 523 return (0); 524 /* 525 * there must be at least two more domain labels and 526 * wildcard has to be in the leftmost label (RFC6125) 527 */ 528 mdot1 = strnstr(m, ".", mlen); 529 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 530 return (0); 531 mdot1idx = mdot1 - m; 532 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 533 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 534 return (0); 535 /* hostname must contain a dot and not be the 1st char */ 536 hdot = strnstr(h, ".", hlen); 537 if (hdot == NULL || hdot == h) 538 return (0); 539 hdotidx = hdot - h; 540 /* 541 * host part of hostname must be at least as long as 542 * pattern it's supposed to match 543 */ 544 if (hdotidx < mdot1idx) 545 return (0); 546 /* 547 * don't allow wildcards in non-traditional domain names 548 * (IDN, A-label, U-label...) 549 */ 550 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 551 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 552 return (0); 553 /* match domain part (part after first dot) */ 554 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 555 mlen - mdot1idx)) 556 return (0); 557 /* match part left of wildcard */ 558 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 559 return (0); 560 /* match part right of wildcard */ 561 delta = mdot1idx - wcidx - 1; 562 if (!fetch_ssl_hname_equal(hdot - delta, delta, 563 mdot1 - delta, delta)) 564 return (0); 565 /* all tests succeeded, it's a match */ 566 return (1); 567 } 568 569 /* 570 * Get numeric host address info - returns NULL if host was not an IP 571 * address. The caller is responsible for deallocation using 572 * freeaddrinfo(3). 573 */ 574 static struct addrinfo * 575 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 576 { 577 struct addrinfo hints, *res; 578 char *host; 579 580 host = (char *)malloc(len + 1); 581 memcpy(host, hostname, len); 582 host[len] = '\0'; 583 memset(&hints, 0, sizeof(hints)); 584 hints.ai_family = PF_UNSPEC; 585 hints.ai_socktype = SOCK_STREAM; 586 hints.ai_protocol = 0; 587 hints.ai_flags = AI_NUMERICHOST; 588 /* port is not relevant for this purpose */ 589 if (getaddrinfo(host, "443", &hints, &res) != 0) 590 res = NULL; 591 free(host); 592 return res; 593 } 594 595 /* 596 * Compare ip address in addrinfo with address passes. 597 */ 598 static int 599 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 600 size_t rhostlen) 601 { 602 const void *left; 603 604 if (lhost->ai_family == AF_INET && rhostlen == 4) { 605 left = (void *)&((struct sockaddr_in*)(void *) 606 lhost->ai_addr)->sin_addr.s_addr; 607 #ifdef INET6 608 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 609 left = (void *)&((struct sockaddr_in6 *)(void *) 610 lhost->ai_addr)->sin6_addr; 611 #endif 612 } else 613 return (0); 614 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 615 } 616 617 /* 618 * Compare ip address in addrinfo with host passed. If host is not an IP 619 * address, comparison will fail. 620 */ 621 static int 622 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 623 size_t rlen) 624 { 625 struct addrinfo *raddr; 626 int ret; 627 char *rip; 628 629 ret = 0; 630 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 631 return 0; /* not a numeric host */ 632 633 if (laddr->ai_family == raddr->ai_family) { 634 if (laddr->ai_family == AF_INET) { 635 rip = (char *)&((struct sockaddr_in *)(void *) 636 raddr->ai_addr)->sin_addr.s_addr; 637 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 638 #ifdef INET6 639 } else if (laddr->ai_family == AF_INET6) { 640 rip = (char *)&((struct sockaddr_in6 *)(void *) 641 raddr->ai_addr)->sin6_addr; 642 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 643 #endif 644 } 645 646 } 647 freeaddrinfo(raddr); 648 return (ret); 649 } 650 651 /* 652 * Verify server certificate by subjectAltName. 653 */ 654 static int 655 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 656 const char *host, struct addrinfo *ip) 657 { 658 const GENERAL_NAME *name; 659 size_t nslen; 660 int i; 661 const char *ns; 662 663 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 664 #if OPENSSL_VERSION_NUMBER < 0x10000000L 665 /* 666 * This is a workaround, since the following line causes 667 * alignment issues in clang: 668 * name = sk_GENERAL_NAME_value(altnames, i); 669 * OpenSSL explicitly warns not to use those macros 670 * directly, but there isn't much choice (and there 671 * shouldn't be any ill side effects) 672 */ 673 name = (GENERAL_NAME *)SKM_sk_value(void, altnames, i); 674 #else 675 name = sk_GENERAL_NAME_value(altnames, i); 676 #endif 677 ns = (const char *)ASN1_STRING_data(name->d.ia5); 678 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 679 680 if (name->type == GEN_DNS && ip == NULL && 681 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 682 return (1); 683 else if (name->type == GEN_IPADD && ip != NULL && 684 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 685 return (1); 686 } 687 return (0); 688 } 689 690 /* 691 * Verify server certificate by CN. 692 */ 693 static int 694 fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 695 struct addrinfo *ip) 696 { 697 ASN1_STRING *namedata; 698 X509_NAME_ENTRY *nameentry; 699 int cnlen, lastpos, loc, ret; 700 unsigned char *cn; 701 702 ret = 0; 703 lastpos = -1; 704 loc = -1; 705 cn = NULL; 706 /* get most specific CN (last entry in list) and compare */ 707 while ((lastpos = X509_NAME_get_index_by_NID(subject, 708 NID_commonName, lastpos)) != -1) 709 loc = lastpos; 710 711 if (loc > -1) { 712 nameentry = X509_NAME_get_entry(subject, loc); 713 namedata = X509_NAME_ENTRY_get_data(nameentry); 714 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 715 if (ip == NULL && 716 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 717 ret = 1; 718 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 719 ret = 1; 720 OPENSSL_free(cn); 721 } 722 return (ret); 723 } 724 725 /* 726 * Verify that server certificate subjectAltName/CN matches 727 * hostname. First check, if there are alternative subject names. If yes, 728 * those have to match. Only if those don't exist it falls back to 729 * checking the subject's CN. 730 */ 731 static int 732 fetch_ssl_verify_hname(X509 *cert, const char *host) 733 { 734 struct addrinfo *ip; 735 STACK_OF(GENERAL_NAME) *altnames; 736 X509_NAME *subject; 737 int ret; 738 739 ret = 0; 740 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 741 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 742 NULL, NULL); 743 744 if (altnames != NULL) { 745 ret = fetch_ssl_verify_altname(altnames, host, ip); 746 } else { 747 subject = X509_get_subject_name(cert); 748 if (subject != NULL) 749 ret = fetch_ssl_verify_cn(subject, host, ip); 750 } 751 752 if (ip != NULL) 753 freeaddrinfo(ip); 754 if (altnames != NULL) 755 GENERAL_NAMES_free(altnames); 756 return (ret); 757 } 758 759 /* 760 * Configure transport security layer based on environment. 761 */ 762 static void 763 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 764 { 765 long ssl_ctx_options; 766 767 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET; 768 if (getenv("SSL_ALLOW_SSL3") == NULL) 769 ssl_ctx_options |= SSL_OP_NO_SSLv3; 770 if (getenv("SSL_NO_TLS1") != NULL) 771 ssl_ctx_options |= SSL_OP_NO_TLSv1; 772 if (getenv("SSL_NO_TLS1_1") != NULL) 773 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 774 if (getenv("SSL_NO_TLS1_2") != NULL) 775 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 776 if (verbose) 777 fetch_info("SSL options: %lx", ssl_ctx_options); 778 SSL_CTX_set_options(ctx, ssl_ctx_options); 779 } 780 781 782 /* 783 * Configure peer verification based on environment. 784 */ 785 #define LOCAL_CERT_FILE "/usr/local/etc/ssl/cert.pem" 786 #define BASE_CERT_FILE "/etc/ssl/cert.pem" 787 static int 788 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 789 { 790 X509_LOOKUP *crl_lookup; 791 X509_STORE *crl_store; 792 const char *ca_cert_file, *ca_cert_path, *crl_file; 793 794 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 795 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 796 if (ca_cert_file == NULL && 797 access(LOCAL_CERT_FILE, R_OK) == 0) 798 ca_cert_file = LOCAL_CERT_FILE; 799 if (ca_cert_file == NULL && 800 access(BASE_CERT_FILE, R_OK) == 0) 801 ca_cert_file = BASE_CERT_FILE; 802 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 803 if (verbose) { 804 fetch_info("Peer verification enabled"); 805 if (ca_cert_file != NULL) 806 fetch_info("Using CA cert file: %s", 807 ca_cert_file); 808 if (ca_cert_path != NULL) 809 fetch_info("Using CA cert path: %s", 810 ca_cert_path); 811 if (ca_cert_file == NULL && ca_cert_path == NULL) 812 fetch_info("Using OpenSSL default " 813 "CA cert file and path"); 814 } 815 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 816 fetch_ssl_cb_verify_crt); 817 if (ca_cert_file != NULL || ca_cert_path != NULL) 818 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 819 ca_cert_path); 820 else 821 SSL_CTX_set_default_verify_paths(ctx); 822 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 823 if (verbose) 824 fetch_info("Using CRL file: %s", crl_file); 825 crl_store = SSL_CTX_get_cert_store(ctx); 826 crl_lookup = X509_STORE_add_lookup(crl_store, 827 X509_LOOKUP_file()); 828 if (crl_lookup == NULL || 829 !X509_load_crl_file(crl_lookup, crl_file, 830 X509_FILETYPE_PEM)) { 831 fprintf(stderr, 832 "Could not load CRL file %s\n", 833 crl_file); 834 return (0); 835 } 836 X509_STORE_set_flags(crl_store, 837 X509_V_FLAG_CRL_CHECK | 838 X509_V_FLAG_CRL_CHECK_ALL); 839 } 840 } 841 return (1); 842 } 843 844 /* 845 * Configure client certificate based on environment. 846 */ 847 static int 848 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 849 { 850 const char *client_cert_file, *client_key_file; 851 852 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 853 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 854 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 855 if (verbose) { 856 fetch_info("Using client cert file: %s", 857 client_cert_file); 858 fetch_info("Using client key file: %s", 859 client_key_file); 860 } 861 if (SSL_CTX_use_certificate_chain_file(ctx, 862 client_cert_file) != 1) { 863 fprintf(stderr, 864 "Could not load client certificate %s\n", 865 client_cert_file); 866 return (0); 867 } 868 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 869 SSL_FILETYPE_PEM) != 1) { 870 fprintf(stderr, 871 "Could not load client key %s\n", 872 client_key_file); 873 return (0); 874 } 875 } 876 return (1); 877 } 878 879 /* 880 * Callback for SSL certificate verification, this is called on server 881 * cert verification. It takes no decision, but informs the user in case 882 * verification failed. 883 */ 884 int 885 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 886 { 887 X509 *crt; 888 X509_NAME *name; 889 char *str; 890 891 str = NULL; 892 if (!verified) { 893 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 894 (name = X509_get_subject_name(crt)) != NULL) 895 str = X509_NAME_oneline(name, 0, 0); 896 fprintf(stderr, "Certificate verification failed for %s\n", 897 str != NULL ? str : "no relevant certificate"); 898 OPENSSL_free(str); 899 } 900 return (verified); 901 } 902 903 #endif 904 905 /* 906 * Enable SSL on a connection. 907 */ 908 int 909 fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 910 { 911 #ifdef WITH_SSL 912 int ret, ssl_err; 913 X509_NAME *name; 914 char *str; 915 916 /* Init the SSL library and context */ 917 if (!SSL_library_init()){ 918 fprintf(stderr, "SSL library init failed\n"); 919 return (-1); 920 } 921 922 SSL_load_error_strings(); 923 924 conn->ssl_meth = SSLv23_client_method(); 925 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 926 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 927 928 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 929 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 930 return (-1); 931 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 932 return (-1); 933 934 conn->ssl = SSL_new(conn->ssl_ctx); 935 if (conn->ssl == NULL) { 936 fprintf(stderr, "SSL context creation failed\n"); 937 return (-1); 938 } 939 SSL_set_fd(conn->ssl, conn->sd); 940 941 #if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT) 942 if (!SSL_set_tlsext_host_name(conn->ssl, 943 __DECONST(struct url *, URL)->host)) { 944 fprintf(stderr, 945 "TLS server name indication extension failed for host %s\n", 946 URL->host); 947 return (-1); 948 } 949 #endif 950 while ((ret = SSL_connect(conn->ssl)) == -1) { 951 ssl_err = SSL_get_error(conn->ssl, ret); 952 if (ssl_err != SSL_ERROR_WANT_READ && 953 ssl_err != SSL_ERROR_WANT_WRITE) { 954 ERR_print_errors_fp(stderr); 955 return (-1); 956 } 957 } 958 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 959 960 if (conn->ssl_cert == NULL) { 961 fprintf(stderr, "No server SSL certificate\n"); 962 return (-1); 963 } 964 965 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 966 if (verbose) 967 fetch_info("Verify hostname"); 968 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 969 fprintf(stderr, 970 "SSL certificate subject doesn't match host %s\n", 971 URL->host); 972 return (-1); 973 } 974 } 975 976 if (verbose) { 977 fetch_info("%s connection established using %s", 978 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 979 name = X509_get_subject_name(conn->ssl_cert); 980 str = X509_NAME_oneline(name, 0, 0); 981 fetch_info("Certificate subject: %s", str); 982 OPENSSL_free(str); 983 name = X509_get_issuer_name(conn->ssl_cert); 984 str = X509_NAME_oneline(name, 0, 0); 985 fetch_info("Certificate issuer: %s", str); 986 OPENSSL_free(str); 987 } 988 989 return (0); 990 #else 991 (void)conn; 992 (void)verbose; 993 fprintf(stderr, "SSL support disabled\n"); 994 return (-1); 995 #endif 996 } 997 998 #define FETCH_READ_WAIT -2 999 #define FETCH_READ_ERROR -1 1000 #define FETCH_READ_DONE 0 1001 1002 #ifdef WITH_SSL 1003 static ssize_t 1004 fetch_ssl_read(SSL *ssl, char *buf, size_t len) 1005 { 1006 ssize_t rlen; 1007 int ssl_err; 1008 1009 rlen = SSL_read(ssl, buf, len); 1010 if (rlen < 0) { 1011 ssl_err = SSL_get_error(ssl, rlen); 1012 if (ssl_err == SSL_ERROR_WANT_READ || 1013 ssl_err == SSL_ERROR_WANT_WRITE) { 1014 return (FETCH_READ_WAIT); 1015 } else { 1016 ERR_print_errors_fp(stderr); 1017 return (FETCH_READ_ERROR); 1018 } 1019 } 1020 return (rlen); 1021 } 1022 #endif 1023 1024 static ssize_t 1025 fetch_socket_read(int sd, char *buf, size_t len) 1026 { 1027 ssize_t rlen; 1028 1029 rlen = read(sd, buf, len); 1030 if (rlen < 0) { 1031 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 1032 return (FETCH_READ_WAIT); 1033 else 1034 return (FETCH_READ_ERROR); 1035 } 1036 return (rlen); 1037 } 1038 1039 /* 1040 * Read a character from a connection w/ timeout 1041 */ 1042 ssize_t 1043 fetch_read(conn_t *conn, char *buf, size_t len) 1044 { 1045 struct timeval now, timeout, delta; 1046 struct pollfd pfd; 1047 ssize_t rlen; 1048 int deltams; 1049 1050 if (fetchTimeout > 0) { 1051 gettimeofday(&timeout, NULL); 1052 timeout.tv_sec += fetchTimeout; 1053 } 1054 1055 deltams = INFTIM; 1056 memset(&pfd, 0, sizeof pfd); 1057 pfd.fd = conn->sd; 1058 pfd.events = POLLIN | POLLERR; 1059 1060 for (;;) { 1061 /* 1062 * The socket is non-blocking. Instead of the canonical 1063 * poll() -> read(), we do the following: 1064 * 1065 * 1) call read() or SSL_read(). 1066 * 2) if we received some data, return it. 1067 * 3) if an error occurred, return -1. 1068 * 4) if read() or SSL_read() signaled EOF, return. 1069 * 5) if we did not receive any data but we're not at EOF, 1070 * call poll(). 1071 * 1072 * In the SSL case, this is necessary because if we 1073 * receive a close notification, we have to call 1074 * SSL_read() one additional time after we've read 1075 * everything we received. 1076 * 1077 * In the non-SSL case, it may improve performance (very 1078 * slightly) when reading small amounts of data. 1079 */ 1080 #ifdef WITH_SSL 1081 if (conn->ssl != NULL) 1082 rlen = fetch_ssl_read(conn->ssl, buf, len); 1083 else 1084 #endif 1085 rlen = fetch_socket_read(conn->sd, buf, len); 1086 if (rlen >= 0) { 1087 break; 1088 } else if (rlen == FETCH_READ_ERROR) { 1089 fetch_syserr(); 1090 return (-1); 1091 } 1092 // assert(rlen == FETCH_READ_WAIT); 1093 if (fetchTimeout > 0) { 1094 gettimeofday(&now, NULL); 1095 if (!timercmp(&timeout, &now, >)) { 1096 errno = ETIMEDOUT; 1097 fetch_syserr(); 1098 return (-1); 1099 } 1100 timersub(&timeout, &now, &delta); 1101 deltams = delta.tv_sec * 1000 + 1102 delta.tv_usec / 1000;; 1103 } 1104 errno = 0; 1105 pfd.revents = 0; 1106 if (poll(&pfd, 1, deltams) < 0) { 1107 if (errno == EINTR && fetchRestartCalls) 1108 continue; 1109 fetch_syserr(); 1110 return (-1); 1111 } 1112 } 1113 return (rlen); 1114 } 1115 1116 1117 /* 1118 * Read a line of text from a connection w/ timeout 1119 */ 1120 #define MIN_BUF_SIZE 1024 1121 1122 int 1123 fetch_getln(conn_t *conn) 1124 { 1125 char *tmp; 1126 size_t tmpsize; 1127 ssize_t len; 1128 char c; 1129 1130 if (conn->buf == NULL) { 1131 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 1132 errno = ENOMEM; 1133 return (-1); 1134 } 1135 conn->bufsize = MIN_BUF_SIZE; 1136 } 1137 1138 conn->buf[0] = '\0'; 1139 conn->buflen = 0; 1140 1141 do { 1142 len = fetch_read(conn, &c, 1); 1143 if (len == -1) 1144 return (-1); 1145 if (len == 0) 1146 break; 1147 conn->buf[conn->buflen++] = c; 1148 if (conn->buflen == conn->bufsize) { 1149 tmp = conn->buf; 1150 tmpsize = conn->bufsize * 2 + 1; 1151 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 1152 errno = ENOMEM; 1153 return (-1); 1154 } 1155 conn->buf = tmp; 1156 conn->bufsize = tmpsize; 1157 } 1158 } while (c != '\n'); 1159 1160 conn->buf[conn->buflen] = '\0'; 1161 DEBUG(fprintf(stderr, "<<< %s", conn->buf)); 1162 return (0); 1163 } 1164 1165 1166 /* 1167 * Write to a connection w/ timeout 1168 */ 1169 ssize_t 1170 fetch_write(conn_t *conn, const char *buf, size_t len) 1171 { 1172 struct iovec iov; 1173 1174 iov.iov_base = __DECONST(char *, buf); 1175 iov.iov_len = len; 1176 return fetch_writev(conn, &iov, 1); 1177 } 1178 1179 /* 1180 * Write a vector to a connection w/ timeout 1181 * Note: can modify the iovec. 1182 */ 1183 ssize_t 1184 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1185 { 1186 struct timeval now, timeout, delta; 1187 struct pollfd pfd; 1188 ssize_t wlen, total; 1189 int deltams; 1190 1191 memset(&pfd, 0, sizeof pfd); 1192 if (fetchTimeout) { 1193 pfd.fd = conn->sd; 1194 pfd.events = POLLOUT | POLLERR; 1195 gettimeofday(&timeout, NULL); 1196 timeout.tv_sec += fetchTimeout; 1197 } 1198 1199 total = 0; 1200 while (iovcnt > 0) { 1201 while (fetchTimeout && pfd.revents == 0) { 1202 gettimeofday(&now, NULL); 1203 if (!timercmp(&timeout, &now, >)) { 1204 errno = ETIMEDOUT; 1205 fetch_syserr(); 1206 return (-1); 1207 } 1208 timersub(&timeout, &now, &delta); 1209 deltams = delta.tv_sec * 1000 + 1210 delta.tv_usec / 1000; 1211 errno = 0; 1212 pfd.revents = 0; 1213 if (poll(&pfd, 1, deltams) < 0) { 1214 /* POSIX compliance */ 1215 if (errno == EAGAIN) 1216 continue; 1217 if (errno == EINTR && fetchRestartCalls) 1218 continue; 1219 return (-1); 1220 } 1221 } 1222 errno = 0; 1223 #ifdef WITH_SSL 1224 if (conn->ssl != NULL) 1225 wlen = SSL_write(conn->ssl, 1226 iov->iov_base, iov->iov_len); 1227 else 1228 #endif 1229 wlen = writev(conn->sd, iov, iovcnt); 1230 if (wlen == 0) { 1231 /* we consider a short write a failure */ 1232 /* XXX perhaps we shouldn't in the SSL case */ 1233 errno = EPIPE; 1234 fetch_syserr(); 1235 return (-1); 1236 } 1237 if (wlen < 0) { 1238 if (errno == EINTR && fetchRestartCalls) 1239 continue; 1240 return (-1); 1241 } 1242 total += wlen; 1243 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1244 wlen -= iov->iov_len; 1245 iov++; 1246 iovcnt--; 1247 } 1248 if (iovcnt > 0) { 1249 iov->iov_len -= wlen; 1250 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1251 } 1252 } 1253 return (total); 1254 } 1255 1256 1257 /* 1258 * Write a line of text to a connection w/ timeout 1259 */ 1260 int 1261 fetch_putln(conn_t *conn, const char *str, size_t len) 1262 { 1263 struct iovec iov[2]; 1264 int ret; 1265 1266 DEBUG(fprintf(stderr, ">>> %s\n", str)); 1267 iov[0].iov_base = __DECONST(char *, str); 1268 iov[0].iov_len = len; 1269 iov[1].iov_base = __DECONST(char *, ENDL); 1270 iov[1].iov_len = sizeof(ENDL); 1271 if (len == 0) 1272 ret = fetch_writev(conn, &iov[1], 1); 1273 else 1274 ret = fetch_writev(conn, iov, 2); 1275 if (ret == -1) 1276 return (-1); 1277 return (0); 1278 } 1279 1280 1281 /* 1282 * Close connection 1283 */ 1284 int 1285 fetch_close(conn_t *conn) 1286 { 1287 int ret; 1288 1289 if (--conn->ref > 0) 1290 return (0); 1291 #ifdef WITH_SSL 1292 if (conn->ssl) { 1293 SSL_shutdown(conn->ssl); 1294 SSL_set_connect_state(conn->ssl); 1295 SSL_free(conn->ssl); 1296 conn->ssl = NULL; 1297 } 1298 if (conn->ssl_ctx) { 1299 SSL_CTX_free(conn->ssl_ctx); 1300 conn->ssl_ctx = NULL; 1301 } 1302 if (conn->ssl_cert) { 1303 X509_free(conn->ssl_cert); 1304 conn->ssl_cert = NULL; 1305 } 1306 #endif 1307 ret = close(conn->sd); 1308 free(conn->buf); 1309 free(conn); 1310 return (ret); 1311 } 1312 1313 1314 /*** Directory-related utility functions *************************************/ 1315 1316 int 1317 fetch_add_entry(struct url_ent **p, int *size, int *len, 1318 const char *name, struct url_stat *us) 1319 { 1320 struct url_ent *tmp; 1321 1322 if (*p == NULL) { 1323 *size = 0; 1324 *len = 0; 1325 } 1326 1327 if (*len >= *size - 1) { 1328 tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p)); 1329 if (tmp == NULL) { 1330 errno = ENOMEM; 1331 fetch_syserr(); 1332 return (-1); 1333 } 1334 *size = (*size * 2 + 1); 1335 *p = tmp; 1336 } 1337 1338 tmp = *p + *len; 1339 snprintf(tmp->name, PATH_MAX, "%s", name); 1340 memcpy(&tmp->stat, us, sizeof(*us)); 1341 1342 (*len)++; 1343 (++tmp)->name[0] = 0; 1344 1345 return (0); 1346 } 1347 1348 1349 /*** Authentication-related utility functions ********************************/ 1350 1351 static const char * 1352 fetch_read_word(FILE *f) 1353 { 1354 static char word[1024]; 1355 1356 if (fscanf(f, " %1023s ", word) != 1) 1357 return (NULL); 1358 return (word); 1359 } 1360 1361 static int 1362 fetch_netrc_open(void) 1363 { 1364 const char *p; 1365 char fn[PATH_MAX]; 1366 1367 if ((p = getenv("NETRC")) != NULL) { 1368 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1369 fetch_info("$NETRC specifies a file name " 1370 "longer than PATH_MAX"); 1371 return (-1); 1372 } 1373 } else { 1374 if ((p = getenv("HOME")) != NULL) { 1375 struct passwd *pwd; 1376 1377 if ((pwd = getpwuid(getuid())) == NULL || 1378 (p = pwd->pw_dir) == NULL) 1379 return (-1); 1380 } 1381 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1382 return (-1); 1383 } 1384 1385 return (open(fn, O_RDONLY)); 1386 } 1387 1388 /* 1389 * Get authentication data for a URL from .netrc 1390 */ 1391 int 1392 fetch_netrc_auth(struct url *url) 1393 { 1394 const char *word; 1395 FILE *f; 1396 1397 if (url->netrcfd == -2) 1398 url->netrcfd = fetch_netrc_open(); 1399 if (url->netrcfd < 0) 1400 return (-1); 1401 if ((f = fdopen(url->netrcfd, "r")) == NULL) 1402 return (-1); 1403 rewind(f); 1404 while ((word = fetch_read_word(f)) != NULL) { 1405 if (strcmp(word, "default") == 0) { 1406 DEBUG(fetch_info("Using default .netrc settings")); 1407 break; 1408 } 1409 if (strcmp(word, "machine") == 0 && 1410 (word = fetch_read_word(f)) != NULL && 1411 strcasecmp(word, url->host) == 0) { 1412 DEBUG(fetch_info("Using .netrc settings for %s", word)); 1413 break; 1414 } 1415 } 1416 if (word == NULL) 1417 goto ferr; 1418 while ((word = fetch_read_word(f)) != NULL) { 1419 if (strcmp(word, "login") == 0) { 1420 if ((word = fetch_read_word(f)) == NULL) 1421 goto ferr; 1422 if (snprintf(url->user, sizeof(url->user), 1423 "%s", word) > (int)sizeof(url->user)) { 1424 fetch_info("login name in .netrc is too long"); 1425 url->user[0] = '\0'; 1426 } 1427 } else if (strcmp(word, "password") == 0) { 1428 if ((word = fetch_read_word(f)) == NULL) 1429 goto ferr; 1430 if (snprintf(url->pwd, sizeof(url->pwd), 1431 "%s", word) > (int)sizeof(url->pwd)) { 1432 fetch_info("password in .netrc is too long"); 1433 url->pwd[0] = '\0'; 1434 } 1435 } else if (strcmp(word, "account") == 0) { 1436 if ((word = fetch_read_word(f)) == NULL) 1437 goto ferr; 1438 /* XXX not supported! */ 1439 } else { 1440 break; 1441 } 1442 } 1443 fclose(f); 1444 return (0); 1445 ferr: 1446 fclose(f); 1447 return (-1); 1448 } 1449 1450 /* 1451 * The no_proxy environment variable specifies a set of domains for 1452 * which the proxy should not be consulted; the contents is a comma-, 1453 * or space-separated list of domain names. A single asterisk will 1454 * override all proxy variables and no transactions will be proxied 1455 * (for compatibility with lynx and curl, see the discussion at 1456 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1457 */ 1458 int 1459 fetch_no_proxy_match(const char *host) 1460 { 1461 const char *no_proxy, *p, *q; 1462 size_t h_len, d_len; 1463 1464 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1465 (no_proxy = getenv("no_proxy")) == NULL) 1466 return (0); 1467 1468 /* asterisk matches any hostname */ 1469 if (strcmp(no_proxy, "*") == 0) 1470 return (1); 1471 1472 h_len = strlen(host); 1473 p = no_proxy; 1474 do { 1475 /* position p at the beginning of a domain suffix */ 1476 while (*p == ',' || isspace((unsigned char)*p)) 1477 p++; 1478 1479 /* position q at the first separator character */ 1480 for (q = p; *q; ++q) 1481 if (*q == ',' || isspace((unsigned char)*q)) 1482 break; 1483 1484 d_len = q - p; 1485 if (d_len > 0 && h_len >= d_len && 1486 strncasecmp(host + h_len - d_len, 1487 p, d_len) == 0) { 1488 /* domain name matches */ 1489 return (1); 1490 } 1491 1492 p = q + 1; 1493 } while (*q); 1494 1495 return (0); 1496 } 1497