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 DEBUGF("---> %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 #if OPENSSL_VERSION_NUMBER < 0x10100000L 678 ns = (const char *)ASN1_STRING_data(name->d.ia5); 679 #else 680 ns = (const char *)ASN1_STRING_get0_data(name->d.ia5); 681 #endif 682 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 683 684 if (name->type == GEN_DNS && ip == NULL && 685 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 686 return (1); 687 else if (name->type == GEN_IPADD && ip != NULL && 688 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 689 return (1); 690 } 691 return (0); 692 } 693 694 /* 695 * Verify server certificate by CN. 696 */ 697 static int 698 fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 699 struct addrinfo *ip) 700 { 701 ASN1_STRING *namedata; 702 X509_NAME_ENTRY *nameentry; 703 int cnlen, lastpos, loc, ret; 704 unsigned char *cn; 705 706 ret = 0; 707 lastpos = -1; 708 loc = -1; 709 cn = NULL; 710 /* get most specific CN (last entry in list) and compare */ 711 while ((lastpos = X509_NAME_get_index_by_NID(subject, 712 NID_commonName, lastpos)) != -1) 713 loc = lastpos; 714 715 if (loc > -1) { 716 nameentry = X509_NAME_get_entry(subject, loc); 717 namedata = X509_NAME_ENTRY_get_data(nameentry); 718 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 719 if (ip == NULL && 720 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 721 ret = 1; 722 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 723 ret = 1; 724 OPENSSL_free(cn); 725 } 726 return (ret); 727 } 728 729 /* 730 * Verify that server certificate subjectAltName/CN matches 731 * hostname. First check, if there are alternative subject names. If yes, 732 * those have to match. Only if those don't exist it falls back to 733 * checking the subject's CN. 734 */ 735 static int 736 fetch_ssl_verify_hname(X509 *cert, const char *host) 737 { 738 struct addrinfo *ip; 739 STACK_OF(GENERAL_NAME) *altnames; 740 X509_NAME *subject; 741 int ret; 742 743 ret = 0; 744 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 745 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 746 NULL, NULL); 747 748 if (altnames != NULL) { 749 ret = fetch_ssl_verify_altname(altnames, host, ip); 750 } else { 751 subject = X509_get_subject_name(cert); 752 if (subject != NULL) 753 ret = fetch_ssl_verify_cn(subject, host, ip); 754 } 755 756 if (ip != NULL) 757 freeaddrinfo(ip); 758 if (altnames != NULL) 759 GENERAL_NAMES_free(altnames); 760 return (ret); 761 } 762 763 /* 764 * Configure transport security layer based on environment. 765 */ 766 static void 767 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 768 { 769 long ssl_ctx_options; 770 771 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET; 772 if (getenv("SSL_ALLOW_SSL3") == NULL) 773 ssl_ctx_options |= SSL_OP_NO_SSLv3; 774 if (getenv("SSL_NO_TLS1") != NULL) 775 ssl_ctx_options |= SSL_OP_NO_TLSv1; 776 if (getenv("SSL_NO_TLS1_1") != NULL) 777 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 778 if (getenv("SSL_NO_TLS1_2") != NULL) 779 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 780 if (verbose) 781 fetch_info("SSL options: %lx", ssl_ctx_options); 782 SSL_CTX_set_options(ctx, ssl_ctx_options); 783 } 784 785 786 /* 787 * Configure peer verification based on environment. 788 */ 789 #define LOCAL_CERT_FILE "/usr/local/etc/ssl/cert.pem" 790 #define BASE_CERT_FILE "/etc/ssl/cert.pem" 791 static int 792 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 793 { 794 X509_LOOKUP *crl_lookup; 795 X509_STORE *crl_store; 796 const char *ca_cert_file, *ca_cert_path, *crl_file; 797 798 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 799 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 800 if (ca_cert_file == NULL && 801 access(LOCAL_CERT_FILE, R_OK) == 0) 802 ca_cert_file = LOCAL_CERT_FILE; 803 if (ca_cert_file == NULL && 804 access(BASE_CERT_FILE, R_OK) == 0) 805 ca_cert_file = BASE_CERT_FILE; 806 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 807 if (verbose) { 808 fetch_info("Peer verification enabled"); 809 if (ca_cert_file != NULL) 810 fetch_info("Using CA cert file: %s", 811 ca_cert_file); 812 if (ca_cert_path != NULL) 813 fetch_info("Using CA cert path: %s", 814 ca_cert_path); 815 if (ca_cert_file == NULL && ca_cert_path == NULL) 816 fetch_info("Using OpenSSL default " 817 "CA cert file and path"); 818 } 819 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 820 fetch_ssl_cb_verify_crt); 821 if (ca_cert_file != NULL || ca_cert_path != NULL) 822 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 823 ca_cert_path); 824 else 825 SSL_CTX_set_default_verify_paths(ctx); 826 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 827 if (verbose) 828 fetch_info("Using CRL file: %s", crl_file); 829 crl_store = SSL_CTX_get_cert_store(ctx); 830 crl_lookup = X509_STORE_add_lookup(crl_store, 831 X509_LOOKUP_file()); 832 if (crl_lookup == NULL || 833 !X509_load_crl_file(crl_lookup, crl_file, 834 X509_FILETYPE_PEM)) { 835 fprintf(stderr, 836 "Could not load CRL file %s\n", 837 crl_file); 838 return (0); 839 } 840 X509_STORE_set_flags(crl_store, 841 X509_V_FLAG_CRL_CHECK | 842 X509_V_FLAG_CRL_CHECK_ALL); 843 } 844 } 845 return (1); 846 } 847 848 /* 849 * Configure client certificate based on environment. 850 */ 851 static int 852 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 853 { 854 const char *client_cert_file, *client_key_file; 855 856 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 857 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 858 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 859 if (verbose) { 860 fetch_info("Using client cert file: %s", 861 client_cert_file); 862 fetch_info("Using client key file: %s", 863 client_key_file); 864 } 865 if (SSL_CTX_use_certificate_chain_file(ctx, 866 client_cert_file) != 1) { 867 fprintf(stderr, 868 "Could not load client certificate %s\n", 869 client_cert_file); 870 return (0); 871 } 872 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 873 SSL_FILETYPE_PEM) != 1) { 874 fprintf(stderr, 875 "Could not load client key %s\n", 876 client_key_file); 877 return (0); 878 } 879 } 880 return (1); 881 } 882 883 /* 884 * Callback for SSL certificate verification, this is called on server 885 * cert verification. It takes no decision, but informs the user in case 886 * verification failed. 887 */ 888 int 889 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 890 { 891 X509 *crt; 892 X509_NAME *name; 893 char *str; 894 895 str = NULL; 896 if (!verified) { 897 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 898 (name = X509_get_subject_name(crt)) != NULL) 899 str = X509_NAME_oneline(name, 0, 0); 900 fprintf(stderr, "Certificate verification failed for %s\n", 901 str != NULL ? str : "no relevant certificate"); 902 OPENSSL_free(str); 903 } 904 return (verified); 905 } 906 907 #endif 908 909 /* 910 * Enable SSL on a connection. 911 */ 912 int 913 fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 914 { 915 #ifdef WITH_SSL 916 int ret, ssl_err; 917 X509_NAME *name; 918 char *str; 919 920 /* Init the SSL library and context */ 921 if (!SSL_library_init()){ 922 fprintf(stderr, "SSL library init failed\n"); 923 return (-1); 924 } 925 926 SSL_load_error_strings(); 927 928 conn->ssl_meth = SSLv23_client_method(); 929 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 930 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 931 932 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 933 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 934 return (-1); 935 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 936 return (-1); 937 938 conn->ssl = SSL_new(conn->ssl_ctx); 939 if (conn->ssl == NULL) { 940 fprintf(stderr, "SSL context creation failed\n"); 941 return (-1); 942 } 943 SSL_set_fd(conn->ssl, conn->sd); 944 945 #if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT) 946 if (!SSL_set_tlsext_host_name(conn->ssl, 947 __DECONST(struct url *, URL)->host)) { 948 fprintf(stderr, 949 "TLS server name indication extension failed for host %s\n", 950 URL->host); 951 return (-1); 952 } 953 #endif 954 while ((ret = SSL_connect(conn->ssl)) == -1) { 955 ssl_err = SSL_get_error(conn->ssl, ret); 956 if (ssl_err != SSL_ERROR_WANT_READ && 957 ssl_err != SSL_ERROR_WANT_WRITE) { 958 ERR_print_errors_fp(stderr); 959 return (-1); 960 } 961 } 962 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 963 964 if (conn->ssl_cert == NULL) { 965 fprintf(stderr, "No server SSL certificate\n"); 966 return (-1); 967 } 968 969 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 970 if (verbose) 971 fetch_info("Verify hostname"); 972 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 973 fprintf(stderr, 974 "SSL certificate subject doesn't match host %s\n", 975 URL->host); 976 return (-1); 977 } 978 } 979 980 if (verbose) { 981 fetch_info("%s connection established using %s", 982 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 983 name = X509_get_subject_name(conn->ssl_cert); 984 str = X509_NAME_oneline(name, 0, 0); 985 fetch_info("Certificate subject: %s", str); 986 OPENSSL_free(str); 987 name = X509_get_issuer_name(conn->ssl_cert); 988 str = X509_NAME_oneline(name, 0, 0); 989 fetch_info("Certificate issuer: %s", str); 990 OPENSSL_free(str); 991 } 992 993 return (0); 994 #else 995 (void)conn; 996 (void)verbose; 997 fprintf(stderr, "SSL support disabled\n"); 998 return (-1); 999 #endif 1000 } 1001 1002 #define FETCH_READ_WAIT -2 1003 #define FETCH_READ_ERROR -1 1004 #define FETCH_READ_DONE 0 1005 1006 #ifdef WITH_SSL 1007 static ssize_t 1008 fetch_ssl_read(SSL *ssl, char *buf, size_t len) 1009 { 1010 ssize_t rlen; 1011 int ssl_err; 1012 1013 rlen = SSL_read(ssl, buf, len); 1014 if (rlen < 0) { 1015 ssl_err = SSL_get_error(ssl, rlen); 1016 if (ssl_err == SSL_ERROR_WANT_READ || 1017 ssl_err == SSL_ERROR_WANT_WRITE) { 1018 return (FETCH_READ_WAIT); 1019 } else { 1020 ERR_print_errors_fp(stderr); 1021 return (FETCH_READ_ERROR); 1022 } 1023 } 1024 return (rlen); 1025 } 1026 #endif 1027 1028 static ssize_t 1029 fetch_socket_read(int sd, char *buf, size_t len) 1030 { 1031 ssize_t rlen; 1032 1033 rlen = read(sd, buf, len); 1034 if (rlen < 0) { 1035 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 1036 return (FETCH_READ_WAIT); 1037 else 1038 return (FETCH_READ_ERROR); 1039 } 1040 return (rlen); 1041 } 1042 1043 /* 1044 * Read a character from a connection w/ timeout 1045 */ 1046 ssize_t 1047 fetch_read(conn_t *conn, char *buf, size_t len) 1048 { 1049 struct timeval now, timeout, delta; 1050 struct pollfd pfd; 1051 ssize_t rlen; 1052 int deltams; 1053 1054 if (fetchTimeout > 0) { 1055 gettimeofday(&timeout, NULL); 1056 timeout.tv_sec += fetchTimeout; 1057 } 1058 1059 deltams = INFTIM; 1060 memset(&pfd, 0, sizeof pfd); 1061 pfd.fd = conn->sd; 1062 pfd.events = POLLIN | POLLERR; 1063 1064 for (;;) { 1065 /* 1066 * The socket is non-blocking. Instead of the canonical 1067 * poll() -> read(), we do the following: 1068 * 1069 * 1) call read() or SSL_read(). 1070 * 2) if we received some data, return it. 1071 * 3) if an error occurred, return -1. 1072 * 4) if read() or SSL_read() signaled EOF, return. 1073 * 5) if we did not receive any data but we're not at EOF, 1074 * call poll(). 1075 * 1076 * In the SSL case, this is necessary because if we 1077 * receive a close notification, we have to call 1078 * SSL_read() one additional time after we've read 1079 * everything we received. 1080 * 1081 * In the non-SSL case, it may improve performance (very 1082 * slightly) when reading small amounts of data. 1083 */ 1084 #ifdef WITH_SSL 1085 if (conn->ssl != NULL) 1086 rlen = fetch_ssl_read(conn->ssl, buf, len); 1087 else 1088 #endif 1089 rlen = fetch_socket_read(conn->sd, buf, len); 1090 if (rlen >= 0) { 1091 break; 1092 } else if (rlen == FETCH_READ_ERROR) { 1093 fetch_syserr(); 1094 return (-1); 1095 } 1096 // assert(rlen == FETCH_READ_WAIT); 1097 if (fetchTimeout > 0) { 1098 gettimeofday(&now, NULL); 1099 if (!timercmp(&timeout, &now, >)) { 1100 errno = ETIMEDOUT; 1101 fetch_syserr(); 1102 return (-1); 1103 } 1104 timersub(&timeout, &now, &delta); 1105 deltams = delta.tv_sec * 1000 + 1106 delta.tv_usec / 1000;; 1107 } 1108 errno = 0; 1109 pfd.revents = 0; 1110 if (poll(&pfd, 1, deltams) < 0) { 1111 if (errno == EINTR && fetchRestartCalls) 1112 continue; 1113 fetch_syserr(); 1114 return (-1); 1115 } 1116 } 1117 return (rlen); 1118 } 1119 1120 1121 /* 1122 * Read a line of text from a connection w/ timeout 1123 */ 1124 #define MIN_BUF_SIZE 1024 1125 1126 int 1127 fetch_getln(conn_t *conn) 1128 { 1129 char *tmp; 1130 size_t tmpsize; 1131 ssize_t len; 1132 char c; 1133 1134 if (conn->buf == NULL) { 1135 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 1136 errno = ENOMEM; 1137 return (-1); 1138 } 1139 conn->bufsize = MIN_BUF_SIZE; 1140 } 1141 1142 conn->buf[0] = '\0'; 1143 conn->buflen = 0; 1144 1145 do { 1146 len = fetch_read(conn, &c, 1); 1147 if (len == -1) 1148 return (-1); 1149 if (len == 0) 1150 break; 1151 conn->buf[conn->buflen++] = c; 1152 if (conn->buflen == conn->bufsize) { 1153 tmp = conn->buf; 1154 tmpsize = conn->bufsize * 2 + 1; 1155 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 1156 errno = ENOMEM; 1157 return (-1); 1158 } 1159 conn->buf = tmp; 1160 conn->bufsize = tmpsize; 1161 } 1162 } while (c != '\n'); 1163 1164 conn->buf[conn->buflen] = '\0'; 1165 DEBUGF("<<< %s", conn->buf); 1166 return (0); 1167 } 1168 1169 1170 /* 1171 * Write to a connection w/ timeout 1172 */ 1173 ssize_t 1174 fetch_write(conn_t *conn, const char *buf, size_t len) 1175 { 1176 struct iovec iov; 1177 1178 iov.iov_base = __DECONST(char *, buf); 1179 iov.iov_len = len; 1180 return fetch_writev(conn, &iov, 1); 1181 } 1182 1183 /* 1184 * Write a vector to a connection w/ timeout 1185 * Note: can modify the iovec. 1186 */ 1187 ssize_t 1188 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1189 { 1190 struct timeval now, timeout, delta; 1191 struct pollfd pfd; 1192 ssize_t wlen, total; 1193 int deltams; 1194 1195 memset(&pfd, 0, sizeof pfd); 1196 if (fetchTimeout) { 1197 pfd.fd = conn->sd; 1198 pfd.events = POLLOUT | POLLERR; 1199 gettimeofday(&timeout, NULL); 1200 timeout.tv_sec += fetchTimeout; 1201 } 1202 1203 total = 0; 1204 while (iovcnt > 0) { 1205 while (fetchTimeout && pfd.revents == 0) { 1206 gettimeofday(&now, NULL); 1207 if (!timercmp(&timeout, &now, >)) { 1208 errno = ETIMEDOUT; 1209 fetch_syserr(); 1210 return (-1); 1211 } 1212 timersub(&timeout, &now, &delta); 1213 deltams = delta.tv_sec * 1000 + 1214 delta.tv_usec / 1000; 1215 errno = 0; 1216 pfd.revents = 0; 1217 if (poll(&pfd, 1, deltams) < 0) { 1218 /* POSIX compliance */ 1219 if (errno == EAGAIN) 1220 continue; 1221 if (errno == EINTR && fetchRestartCalls) 1222 continue; 1223 return (-1); 1224 } 1225 } 1226 errno = 0; 1227 #ifdef WITH_SSL 1228 if (conn->ssl != NULL) 1229 wlen = SSL_write(conn->ssl, 1230 iov->iov_base, iov->iov_len); 1231 else 1232 #endif 1233 wlen = writev(conn->sd, iov, iovcnt); 1234 if (wlen == 0) { 1235 /* we consider a short write a failure */ 1236 /* XXX perhaps we shouldn't in the SSL case */ 1237 errno = EPIPE; 1238 fetch_syserr(); 1239 return (-1); 1240 } 1241 if (wlen < 0) { 1242 if (errno == EINTR && fetchRestartCalls) 1243 continue; 1244 return (-1); 1245 } 1246 total += wlen; 1247 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1248 wlen -= iov->iov_len; 1249 iov++; 1250 iovcnt--; 1251 } 1252 if (iovcnt > 0) { 1253 iov->iov_len -= wlen; 1254 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1255 } 1256 } 1257 return (total); 1258 } 1259 1260 1261 /* 1262 * Write a line of text to a connection w/ timeout 1263 */ 1264 int 1265 fetch_putln(conn_t *conn, const char *str, size_t len) 1266 { 1267 struct iovec iov[2]; 1268 int ret; 1269 1270 DEBUGF(">>> %s\n", str); 1271 iov[0].iov_base = __DECONST(char *, str); 1272 iov[0].iov_len = len; 1273 iov[1].iov_base = __DECONST(char *, ENDL); 1274 iov[1].iov_len = sizeof(ENDL); 1275 if (len == 0) 1276 ret = fetch_writev(conn, &iov[1], 1); 1277 else 1278 ret = fetch_writev(conn, iov, 2); 1279 if (ret == -1) 1280 return (-1); 1281 return (0); 1282 } 1283 1284 1285 /* 1286 * Close connection 1287 */ 1288 int 1289 fetch_close(conn_t *conn) 1290 { 1291 int ret; 1292 1293 if (--conn->ref > 0) 1294 return (0); 1295 #ifdef WITH_SSL 1296 if (conn->ssl) { 1297 SSL_shutdown(conn->ssl); 1298 SSL_set_connect_state(conn->ssl); 1299 SSL_free(conn->ssl); 1300 conn->ssl = NULL; 1301 } 1302 if (conn->ssl_ctx) { 1303 SSL_CTX_free(conn->ssl_ctx); 1304 conn->ssl_ctx = NULL; 1305 } 1306 if (conn->ssl_cert) { 1307 X509_free(conn->ssl_cert); 1308 conn->ssl_cert = NULL; 1309 } 1310 #endif 1311 ret = close(conn->sd); 1312 free(conn->buf); 1313 free(conn); 1314 return (ret); 1315 } 1316 1317 1318 /*** Directory-related utility functions *************************************/ 1319 1320 int 1321 fetch_add_entry(struct url_ent **p, int *size, int *len, 1322 const char *name, struct url_stat *us) 1323 { 1324 struct url_ent *tmp; 1325 1326 if (*p == NULL) { 1327 *size = 0; 1328 *len = 0; 1329 } 1330 1331 if (*len >= *size - 1) { 1332 tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p)); 1333 if (tmp == NULL) { 1334 errno = ENOMEM; 1335 fetch_syserr(); 1336 return (-1); 1337 } 1338 *size = (*size * 2 + 1); 1339 *p = tmp; 1340 } 1341 1342 tmp = *p + *len; 1343 snprintf(tmp->name, PATH_MAX, "%s", name); 1344 memcpy(&tmp->stat, us, sizeof(*us)); 1345 1346 (*len)++; 1347 (++tmp)->name[0] = 0; 1348 1349 return (0); 1350 } 1351 1352 1353 /*** Authentication-related utility functions ********************************/ 1354 1355 static const char * 1356 fetch_read_word(FILE *f) 1357 { 1358 static char word[1024]; 1359 1360 if (fscanf(f, " %1023s ", word) != 1) 1361 return (NULL); 1362 return (word); 1363 } 1364 1365 static int 1366 fetch_netrc_open(void) 1367 { 1368 struct passwd *pwd; 1369 char fn[PATH_MAX]; 1370 const char *p; 1371 int fd, serrno; 1372 1373 if ((p = getenv("NETRC")) != NULL) { 1374 DEBUGF("NETRC=%s\n", p); 1375 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1376 fetch_info("$NETRC specifies a file name " 1377 "longer than PATH_MAX"); 1378 return (-1); 1379 } 1380 } else { 1381 if ((p = getenv("HOME")) == NULL) { 1382 if ((pwd = getpwuid(getuid())) == NULL || 1383 (p = pwd->pw_dir) == NULL) 1384 return (-1); 1385 } 1386 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1387 return (-1); 1388 } 1389 1390 if ((fd = open(fn, O_RDONLY)) < 0) { 1391 serrno = errno; 1392 DEBUGF("%s: %s\n", fn, strerror(serrno)); 1393 errno = serrno; 1394 } 1395 return (fd); 1396 } 1397 1398 /* 1399 * Get authentication data for a URL from .netrc 1400 */ 1401 int 1402 fetch_netrc_auth(struct url *url) 1403 { 1404 const char *word; 1405 int serrno; 1406 FILE *f; 1407 1408 if (url->netrcfd < 0) 1409 url->netrcfd = fetch_netrc_open(); 1410 if (url->netrcfd < 0) 1411 return (-1); 1412 if ((f = fdopen(url->netrcfd, "r")) == NULL) { 1413 serrno = errno; 1414 DEBUGF("fdopen(netrcfd): %s", strerror(errno)); 1415 close(url->netrcfd); 1416 url->netrcfd = -1; 1417 errno = serrno; 1418 return (-1); 1419 } 1420 rewind(f); 1421 DEBUGF("searching netrc for %s\n", url->host); 1422 while ((word = fetch_read_word(f)) != NULL) { 1423 if (strcmp(word, "default") == 0) { 1424 DEBUGF("using default netrc settings\n"); 1425 break; 1426 } 1427 if (strcmp(word, "machine") == 0 && 1428 (word = fetch_read_word(f)) != NULL && 1429 strcasecmp(word, url->host) == 0) { 1430 DEBUGF("using netrc settings for %s\n", word); 1431 break; 1432 } 1433 } 1434 if (word == NULL) 1435 goto ferr; 1436 while ((word = fetch_read_word(f)) != NULL) { 1437 if (strcmp(word, "login") == 0) { 1438 if ((word = fetch_read_word(f)) == NULL) 1439 goto ferr; 1440 if (snprintf(url->user, sizeof(url->user), 1441 "%s", word) > (int)sizeof(url->user)) { 1442 fetch_info("login name in .netrc is too long"); 1443 url->user[0] = '\0'; 1444 } 1445 } else if (strcmp(word, "password") == 0) { 1446 if ((word = fetch_read_word(f)) == NULL) 1447 goto ferr; 1448 if (snprintf(url->pwd, sizeof(url->pwd), 1449 "%s", word) > (int)sizeof(url->pwd)) { 1450 fetch_info("password in .netrc is too long"); 1451 url->pwd[0] = '\0'; 1452 } 1453 } else if (strcmp(word, "account") == 0) { 1454 if ((word = fetch_read_word(f)) == NULL) 1455 goto ferr; 1456 /* XXX not supported! */ 1457 } else { 1458 break; 1459 } 1460 } 1461 fclose(f); 1462 url->netrcfd = -1; 1463 return (0); 1464 ferr: 1465 serrno = errno; 1466 fclose(f); 1467 url->netrcfd = -1; 1468 errno = serrno; 1469 return (-1); 1470 } 1471 1472 /* 1473 * The no_proxy environment variable specifies a set of domains for 1474 * which the proxy should not be consulted; the contents is a comma-, 1475 * or space-separated list of domain names. A single asterisk will 1476 * override all proxy variables and no transactions will be proxied 1477 * (for compatibility with lynx and curl, see the discussion at 1478 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1479 */ 1480 int 1481 fetch_no_proxy_match(const char *host) 1482 { 1483 const char *no_proxy, *p, *q; 1484 size_t h_len, d_len; 1485 1486 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1487 (no_proxy = getenv("no_proxy")) == NULL) 1488 return (0); 1489 1490 /* asterisk matches any hostname */ 1491 if (strcmp(no_proxy, "*") == 0) 1492 return (1); 1493 1494 h_len = strlen(host); 1495 p = no_proxy; 1496 do { 1497 /* position p at the beginning of a domain suffix */ 1498 while (*p == ',' || isspace((unsigned char)*p)) 1499 p++; 1500 1501 /* position q at the first separator character */ 1502 for (q = p; *q; ++q) 1503 if (*q == ',' || isspace((unsigned char)*q)) 1504 break; 1505 1506 d_len = q - p; 1507 if (d_len > 0 && h_len >= d_len && 1508 strncasecmp(host + h_len - d_len, 1509 p, d_len) == 0) { 1510 /* domain name matches */ 1511 return (1); 1512 } 1513 1514 p = q + 1; 1515 } while (*q); 1516 1517 return (0); 1518 } 1519