1/*- 2 * Copyright (c) 1998-2016 Dag-Erling Sm��rgrav 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: stable/11/lib/libfetch/common.c 339250 2018-10-09 10:49:19Z des $"); 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 */ 65static 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 */ 76static const char ENDL[2] = "\r\n"; 77 78 79/*** Error-reporting functions ***********************************************/ 80 81/* 82 * Map error code to string 83 */ 84static struct fetcherr * 85fetch_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 */ 95void 96fetch_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 */ 106void 107fetch_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 */ 166void 167fetch_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 */ 183int 184fetch_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 */ 200int 201fetch_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 */ 214conn_t * 215fetch_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 */ 234conn_t * 235fetch_ref(conn_t *conn) 236{ 237 238 ++conn->ref; 239 return (conn); 240} 241 242 243/* 244 * Resolve an address 245 */ 246struct addrinfo * 247fetch_resolve(const char *addr, int port, int af) 248{ 249 char hbuf[256], sbuf[8]; 250 struct addrinfo hints, *res; 251 const char *hb, *he, *sep; 252 const char *host, *service; 253 int err, len; 254 255 /* first, check for a bracketed IPv6 address */ 256 if (*addr == '[') { 257 hb = addr + 1; 258 if ((sep = strchr(hb, ']')) == NULL) { 259 errno = EINVAL; 260 goto syserr; 261 } 262 he = sep++; 263 } else { 264 hb = addr; 265 sep = strchrnul(hb, ':'); 266 he = sep; 267 } 268 269 /* see if we need to copy the host name */ 270 if (*he != '\0') { 271 len = snprintf(hbuf, sizeof(hbuf), 272 "%.*s", (int)(he - hb), hb); 273 if (len < 0) 274 goto syserr; 275 if (len >= (int)sizeof(hbuf)) { 276 errno = ENAMETOOLONG; 277 goto syserr; 278 } 279 host = hbuf; 280 } else { 281 host = hb; 282 } 283 284 /* was it followed by a service name? */ 285 if (*sep == '\0' && port != 0) { 286 if (port < 1 || port > 65535) { 287 errno = EINVAL; 288 goto syserr; 289 } 290 if (snprintf(sbuf, sizeof(sbuf), "%d", port) < 0) 291 goto syserr; 292 service = sbuf; 293 } else if (*sep != '\0') { 294 service = sep + 1; 295 } else { 296 service = NULL; 297 } 298 299 /* resolve */ 300 memset(&hints, 0, sizeof(hints)); 301 hints.ai_family = af; 302 hints.ai_socktype = SOCK_STREAM; 303 hints.ai_flags = AI_ADDRCONFIG; 304 if ((err = getaddrinfo(host, service, &hints, &res)) != 0) { 305 netdb_seterr(err); 306 return (NULL); 307 } 308 return (res); 309syserr: 310 fetch_syserr(); 311 return (NULL); 312} 313 314 315 316/* 317 * Bind a socket to a specific local address 318 */ 319int 320fetch_bind(int sd, int af, const char *addr) 321{ 322 struct addrinfo *cliai, *ai; 323 int err; 324 325 if ((cliai = fetch_resolve(addr, 0, af)) == NULL) 326 return (-1); 327 for (ai = cliai; ai != NULL; ai = ai->ai_next) 328 if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0) 329 break; 330 if (err != 0) 331 fetch_syserr(); 332 freeaddrinfo(cliai); 333 return (err == 0 ? 0 : -1); 334} 335 336 337/* 338 * Establish a TCP connection to the specified port on the specified host. 339 */ 340conn_t * 341fetch_connect(const char *host, int port, int af, int verbose) 342{ 343 struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai; 344 const char *bindaddr; 345 conn_t *conn = NULL; 346 int err = 0, sd = -1; 347 348 DEBUGF("---> %s:%d\n", host, port); 349 350 /* resolve server address */ 351 if (verbose) 352 fetch_info("resolving server address: %s:%d", host, port); 353 if ((sais = fetch_resolve(host, port, af)) == NULL) 354 goto fail; 355 356 /* resolve client address */ 357 bindaddr = getenv("FETCH_BIND_ADDRESS"); 358 if (bindaddr != NULL && *bindaddr != '\0') { 359 if (verbose) 360 fetch_info("resolving client address: %s", bindaddr); 361 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL) 362 goto fail; 363 } 364 365 /* try each server address in turn */ 366 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) { 367 /* open socket */ 368 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0) 369 goto syserr; 370 /* attempt to bind to client address */ 371 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) { 372 if (cai->ai_family != sai->ai_family) 373 continue; 374 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0) 375 break; 376 } 377 if (err != 0) { 378 if (verbose) 379 fetch_info("failed to bind to %s", bindaddr); 380 goto syserr; 381 } 382 /* attempt to connect to server address */ 383 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0) 384 break; 385 /* clean up before next attempt */ 386 close(sd); 387 sd = -1; 388 } 389 if (err != 0) { 390 if (verbose) 391 fetch_info("failed to connect to %s:%d", host, port); 392 goto syserr; 393 } 394 395 if ((conn = fetch_reopen(sd)) == NULL) 396 goto syserr; 397 if (cais != NULL) 398 freeaddrinfo(cais); 399 if (sais != NULL) 400 freeaddrinfo(sais); 401 return (conn); 402syserr: 403 fetch_syserr(); 404 goto fail; 405fail: 406 if (sd >= 0) 407 close(sd); 408 if (cais != NULL) 409 freeaddrinfo(cais); 410 if (sais != NULL) 411 freeaddrinfo(sais); 412 return (NULL); 413} 414 415#ifdef WITH_SSL 416/* 417 * Convert characters A-Z to lowercase (intentionally avoid any locale 418 * specific conversions). 419 */ 420static char 421fetch_ssl_tolower(char in) 422{ 423 if (in >= 'A' && in <= 'Z') 424 return (in + 32); 425 else 426 return (in); 427} 428 429/* 430 * isalpha implementation that intentionally avoids any locale specific 431 * conversions. 432 */ 433static int 434fetch_ssl_isalpha(char in) 435{ 436 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 437} 438 439/* 440 * Check if passed hostnames a and b are equal. 441 */ 442static int 443fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 444 size_t blen) 445{ 446 size_t i; 447 448 if (alen != blen) 449 return (0); 450 for (i = 0; i < alen; ++i) { 451 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 452 return (0); 453 } 454 return (1); 455} 456 457/* 458 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 459 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 460 * numeric characters. Double hyphens (like they're found in IDN a-labels 461 * 'xn--') are not allowed. Empty labels are invalid. 462 */ 463static int 464fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 465{ 466 size_t i; 467 468 if (!len || l[0] == '-' || l[len-1] == '-') 469 return (0); 470 for (i = 0; i < len; ++i) { 471 if (!isdigit(l[i]) && 472 !fetch_ssl_isalpha(l[i]) && 473 !(l[i] == '*' && wcok) && 474 !(l[i] == '-' && l[i - 1] != '-')) 475 return (0); 476 } 477 return (1); 478} 479 480/* 481 * Check if host name consists only of numbers. This might indicate an IP 482 * address, which is not a good idea for CN wildcard comparison. 483 */ 484static int 485fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 486{ 487 size_t i; 488 489 for (i = 0; i < len; ++i) { 490 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 491 hostname[i] == '.')) 492 return (0); 493 } 494 return (1); 495} 496 497/* 498 * Check if the host name h passed matches the pattern passed in m which 499 * is usually part of subjectAltName or CN of a certificate presented to 500 * the client. This includes wildcard matching. The algorithm is based on 501 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 502 */ 503static int 504fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 505 size_t mlen) 506{ 507 int delta, hdotidx, mdot1idx, wcidx; 508 const char *hdot, *mdot1, *mdot2; 509 const char *wc; /* wildcard */ 510 511 if (!(h && *h && m && *m)) 512 return (0); 513 if ((wc = strnstr(m, "*", mlen)) == NULL) 514 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 515 wcidx = wc - m; 516 /* hostname should not be just dots and numbers */ 517 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 518 return (0); 519 /* only one wildcard allowed in pattern */ 520 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 521 return (0); 522 /* 523 * there must be at least two more domain labels and 524 * wildcard has to be in the leftmost label (RFC6125) 525 */ 526 mdot1 = strnstr(m, ".", mlen); 527 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 528 return (0); 529 mdot1idx = mdot1 - m; 530 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 531 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 532 return (0); 533 /* hostname must contain a dot and not be the 1st char */ 534 hdot = strnstr(h, ".", hlen); 535 if (hdot == NULL || hdot == h) 536 return (0); 537 hdotidx = hdot - h; 538 /* 539 * host part of hostname must be at least as long as 540 * pattern it's supposed to match 541 */ 542 if (hdotidx < mdot1idx) 543 return (0); 544 /* 545 * don't allow wildcards in non-traditional domain names 546 * (IDN, A-label, U-label...) 547 */ 548 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 549 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 550 return (0); 551 /* match domain part (part after first dot) */ 552 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 553 mlen - mdot1idx)) 554 return (0); 555 /* match part left of wildcard */ 556 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 557 return (0); 558 /* match part right of wildcard */ 559 delta = mdot1idx - wcidx - 1; 560 if (!fetch_ssl_hname_equal(hdot - delta, delta, 561 mdot1 - delta, delta)) 562 return (0); 563 /* all tests succeeded, it's a match */ 564 return (1); 565} 566 567/* 568 * Get numeric host address info - returns NULL if host was not an IP 569 * address. The caller is responsible for deallocation using 570 * freeaddrinfo(3). 571 */ 572static struct addrinfo * 573fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 574{ 575 struct addrinfo hints, *res; 576 char *host; 577 578 host = (char *)malloc(len + 1); 579 memcpy(host, hostname, len); 580 host[len] = '\0'; 581 memset(&hints, 0, sizeof(hints)); 582 hints.ai_family = PF_UNSPEC; 583 hints.ai_socktype = SOCK_STREAM; 584 hints.ai_protocol = 0; 585 hints.ai_flags = AI_NUMERICHOST; 586 /* port is not relevant for this purpose */ 587 if (getaddrinfo(host, "443", &hints, &res) != 0) 588 res = NULL; 589 free(host); 590 return res; 591} 592 593/* 594 * Compare ip address in addrinfo with address passes. 595 */ 596static int 597fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 598 size_t rhostlen) 599{ 600 const void *left; 601 602 if (lhost->ai_family == AF_INET && rhostlen == 4) { 603 left = (void *)&((struct sockaddr_in*)(void *) 604 lhost->ai_addr)->sin_addr.s_addr; 605#ifdef INET6 606 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 607 left = (void *)&((struct sockaddr_in6 *)(void *) 608 lhost->ai_addr)->sin6_addr; 609#endif 610 } else 611 return (0); 612 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 613} 614 615/* 616 * Compare ip address in addrinfo with host passed. If host is not an IP 617 * address, comparison will fail. 618 */ 619static int 620fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 621 size_t rlen) 622{ 623 struct addrinfo *raddr; 624 int ret; 625 char *rip; 626 627 ret = 0; 628 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 629 return 0; /* not a numeric host */ 630 631 if (laddr->ai_family == raddr->ai_family) { 632 if (laddr->ai_family == AF_INET) { 633 rip = (char *)&((struct sockaddr_in *)(void *) 634 raddr->ai_addr)->sin_addr.s_addr; 635 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 636#ifdef INET6 637 } else if (laddr->ai_family == AF_INET6) { 638 rip = (char *)&((struct sockaddr_in6 *)(void *) 639 raddr->ai_addr)->sin6_addr; 640 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 641#endif 642 } 643 644 } 645 freeaddrinfo(raddr); 646 return (ret); 647} 648 649/* 650 * Verify server certificate by subjectAltName. 651 */ 652static int 653fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 654 const char *host, struct addrinfo *ip) 655{ 656 const GENERAL_NAME *name; 657 size_t nslen; 658 int i; 659 const char *ns; 660 661 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 662#if OPENSSL_VERSION_NUMBER < 0x10000000L 663 /* 664 * This is a workaround, since the following line causes 665 * alignment issues in clang: 666 * name = sk_GENERAL_NAME_value(altnames, i); 667 * OpenSSL explicitly warns not to use those macros 668 * directly, but there isn't much choice (and there 669 * shouldn't be any ill side effects) 670 */ 671 name = (GENERAL_NAME *)SKM_sk_value(void, altnames, i); 672#else 673 name = sk_GENERAL_NAME_value(altnames, i); 674#endif 675 ns = (const char *)ASN1_STRING_data(name->d.ia5); 676 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 677 678 if (name->type == GEN_DNS && ip == NULL && 679 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 680 return (1); 681 else if (name->type == GEN_IPADD && ip != NULL && 682 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 683 return (1); 684 } 685 return (0); 686} 687 688/* 689 * Verify server certificate by CN. 690 */ 691static int 692fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 693 struct addrinfo *ip) 694{ 695 ASN1_STRING *namedata; 696 X509_NAME_ENTRY *nameentry; 697 int cnlen, lastpos, loc, ret; 698 unsigned char *cn; 699 700 ret = 0; 701 lastpos = -1; 702 loc = -1; 703 cn = NULL; 704 /* get most specific CN (last entry in list) and compare */ 705 while ((lastpos = X509_NAME_get_index_by_NID(subject, 706 NID_commonName, lastpos)) != -1) 707 loc = lastpos; 708 709 if (loc > -1) { 710 nameentry = X509_NAME_get_entry(subject, loc); 711 namedata = X509_NAME_ENTRY_get_data(nameentry); 712 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 713 if (ip == NULL && 714 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 715 ret = 1; 716 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 717 ret = 1; 718 OPENSSL_free(cn); 719 } 720 return (ret); 721} 722 723/* 724 * Verify that server certificate subjectAltName/CN matches 725 * hostname. First check, if there are alternative subject names. If yes, 726 * those have to match. Only if those don't exist it falls back to 727 * checking the subject's CN. 728 */ 729static int 730fetch_ssl_verify_hname(X509 *cert, const char *host) 731{ 732 struct addrinfo *ip; 733 STACK_OF(GENERAL_NAME) *altnames; 734 X509_NAME *subject; 735 int ret; 736 737 ret = 0; 738 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 739 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 740 NULL, NULL); 741 742 if (altnames != NULL) { 743 ret = fetch_ssl_verify_altname(altnames, host, ip); 744 } else { 745 subject = X509_get_subject_name(cert); 746 if (subject != NULL) 747 ret = fetch_ssl_verify_cn(subject, host, ip); 748 } 749 750 if (ip != NULL) 751 freeaddrinfo(ip); 752 if (altnames != NULL) 753 GENERAL_NAMES_free(altnames); 754 return (ret); 755} 756 757/* 758 * Configure transport security layer based on environment. 759 */ 760static void 761fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 762{ 763 long ssl_ctx_options; 764 765 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET; 766 if (getenv("SSL_ALLOW_SSL3") == NULL) 767 ssl_ctx_options |= SSL_OP_NO_SSLv3; 768 if (getenv("SSL_NO_TLS1") != NULL) 769 ssl_ctx_options |= SSL_OP_NO_TLSv1; 770 if (getenv("SSL_NO_TLS1_1") != NULL) 771 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 772 if (getenv("SSL_NO_TLS1_2") != NULL) 773 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 774 if (verbose) 775 fetch_info("SSL options: %lx", ssl_ctx_options); 776 SSL_CTX_set_options(ctx, ssl_ctx_options); 777} 778 779 780/* 781 * Configure peer verification based on environment. 782 */ 783#define LOCAL_CERT_FILE "/usr/local/etc/ssl/cert.pem" 784#define BASE_CERT_FILE "/etc/ssl/cert.pem" 785static int 786fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 787{ 788 X509_LOOKUP *crl_lookup; 789 X509_STORE *crl_store; 790 const char *ca_cert_file, *ca_cert_path, *crl_file; 791 792 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 793 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 794 if (ca_cert_file == NULL && 795 access(LOCAL_CERT_FILE, R_OK) == 0) 796 ca_cert_file = LOCAL_CERT_FILE; 797 if (ca_cert_file == NULL && 798 access(BASE_CERT_FILE, R_OK) == 0) 799 ca_cert_file = BASE_CERT_FILE; 800 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 801 if (verbose) { 802 fetch_info("Peer verification enabled"); 803 if (ca_cert_file != NULL) 804 fetch_info("Using CA cert file: %s", 805 ca_cert_file); 806 if (ca_cert_path != NULL) 807 fetch_info("Using CA cert path: %s", 808 ca_cert_path); 809 if (ca_cert_file == NULL && ca_cert_path == NULL) 810 fetch_info("Using OpenSSL default " 811 "CA cert file and path"); 812 } 813 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 814 fetch_ssl_cb_verify_crt); 815 if (ca_cert_file != NULL || ca_cert_path != NULL) 816 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 817 ca_cert_path); 818 else 819 SSL_CTX_set_default_verify_paths(ctx); 820 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 821 if (verbose) 822 fetch_info("Using CRL file: %s", crl_file); 823 crl_store = SSL_CTX_get_cert_store(ctx); 824 crl_lookup = X509_STORE_add_lookup(crl_store, 825 X509_LOOKUP_file()); 826 if (crl_lookup == NULL || 827 !X509_load_crl_file(crl_lookup, crl_file, 828 X509_FILETYPE_PEM)) { 829 fprintf(stderr, 830 "Could not load CRL file %s\n", 831 crl_file); 832 return (0); 833 } 834 X509_STORE_set_flags(crl_store, 835 X509_V_FLAG_CRL_CHECK | 836 X509_V_FLAG_CRL_CHECK_ALL); 837 } 838 } 839 return (1); 840} 841 842/* 843 * Configure client certificate based on environment. 844 */ 845static int 846fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 847{ 848 const char *client_cert_file, *client_key_file; 849 850 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 851 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 852 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 853 if (verbose) { 854 fetch_info("Using client cert file: %s", 855 client_cert_file); 856 fetch_info("Using client key file: %s", 857 client_key_file); 858 } 859 if (SSL_CTX_use_certificate_chain_file(ctx, 860 client_cert_file) != 1) { 861 fprintf(stderr, 862 "Could not load client certificate %s\n", 863 client_cert_file); 864 return (0); 865 } 866 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 867 SSL_FILETYPE_PEM) != 1) { 868 fprintf(stderr, 869 "Could not load client key %s\n", 870 client_key_file); 871 return (0); 872 } 873 } 874 return (1); 875} 876 877/* 878 * Callback for SSL certificate verification, this is called on server 879 * cert verification. It takes no decision, but informs the user in case 880 * verification failed. 881 */ 882int 883fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 884{ 885 X509 *crt; 886 X509_NAME *name; 887 char *str; 888 889 str = NULL; 890 if (!verified) { 891 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 892 (name = X509_get_subject_name(crt)) != NULL) 893 str = X509_NAME_oneline(name, 0, 0); 894 fprintf(stderr, "Certificate verification failed for %s\n", 895 str != NULL ? str : "no relevant certificate"); 896 OPENSSL_free(str); 897 } 898 return (verified); 899} 900 901#endif 902 903/* 904 * Enable SSL on a connection. 905 */ 906int 907fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 908{ 909#ifdef WITH_SSL 910 int ret, ssl_err; 911 X509_NAME *name; 912 char *str; 913 914 /* Init the SSL library and context */ 915 if (!SSL_library_init()){ 916 fprintf(stderr, "SSL library init failed\n"); 917 return (-1); 918 } 919 920 SSL_load_error_strings(); 921 922 conn->ssl_meth = SSLv23_client_method(); 923 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 924 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 925 926 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 927 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 928 return (-1); 929 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 930 return (-1); 931 932 conn->ssl = SSL_new(conn->ssl_ctx); 933 if (conn->ssl == NULL) { 934 fprintf(stderr, "SSL context creation failed\n"); 935 return (-1); 936 } 937 SSL_set_fd(conn->ssl, conn->sd); 938 939#if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT) 940 if (!SSL_set_tlsext_host_name(conn->ssl, 941 __DECONST(struct url *, URL)->host)) { 942 fprintf(stderr, 943 "TLS server name indication extension failed for host %s\n", 944 URL->host); 945 return (-1); 946 } 947#endif 948 while ((ret = SSL_connect(conn->ssl)) == -1) { 949 ssl_err = SSL_get_error(conn->ssl, ret); 950 if (ssl_err != SSL_ERROR_WANT_READ && 951 ssl_err != SSL_ERROR_WANT_WRITE) { 952 ERR_print_errors_fp(stderr); 953 return (-1); 954 } 955 } 956 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 957 958 if (conn->ssl_cert == NULL) { 959 fprintf(stderr, "No server SSL certificate\n"); 960 return (-1); 961 } 962 963 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 964 if (verbose) 965 fetch_info("Verify hostname"); 966 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 967 fprintf(stderr, 968 "SSL certificate subject doesn't match host %s\n", 969 URL->host); 970 return (-1); 971 } 972 } 973 974 if (verbose) { 975 fetch_info("%s connection established using %s", 976 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 977 name = X509_get_subject_name(conn->ssl_cert); 978 str = X509_NAME_oneline(name, 0, 0); 979 fetch_info("Certificate subject: %s", str); 980 OPENSSL_free(str); 981 name = X509_get_issuer_name(conn->ssl_cert); 982 str = X509_NAME_oneline(name, 0, 0); 983 fetch_info("Certificate issuer: %s", str); 984 OPENSSL_free(str); 985 } 986 987 return (0); 988#else 989 (void)conn; 990 (void)verbose; 991 fprintf(stderr, "SSL support disabled\n"); 992 return (-1); 993#endif 994} 995 996#define FETCH_READ_WAIT -2 997#define FETCH_READ_ERROR -1 998#define FETCH_READ_DONE 0 999 1000#ifdef WITH_SSL 1001static ssize_t 1002fetch_ssl_read(SSL *ssl, char *buf, size_t len) 1003{ 1004 ssize_t rlen; 1005 int ssl_err; 1006 1007 rlen = SSL_read(ssl, buf, len); 1008 if (rlen < 0) { 1009 ssl_err = SSL_get_error(ssl, rlen); 1010 if (ssl_err == SSL_ERROR_WANT_READ || 1011 ssl_err == SSL_ERROR_WANT_WRITE) { 1012 return (FETCH_READ_WAIT); 1013 } else { 1014 ERR_print_errors_fp(stderr); 1015 return (FETCH_READ_ERROR); 1016 } 1017 } 1018 return (rlen); 1019} 1020#endif 1021 1022static ssize_t 1023fetch_socket_read(int sd, char *buf, size_t len) 1024{ 1025 ssize_t rlen; 1026 1027 rlen = read(sd, buf, len); 1028 if (rlen < 0) { 1029 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 1030 return (FETCH_READ_WAIT); 1031 else 1032 return (FETCH_READ_ERROR); 1033 } 1034 return (rlen); 1035} 1036 1037/* 1038 * Read a character from a connection w/ timeout 1039 */ 1040ssize_t 1041fetch_read(conn_t *conn, char *buf, size_t len) 1042{ 1043 struct timeval now, timeout, delta; 1044 struct pollfd pfd; 1045 ssize_t rlen; 1046 int deltams; 1047 1048 if (fetchTimeout > 0) { 1049 gettimeofday(&timeout, NULL); 1050 timeout.tv_sec += fetchTimeout; 1051 } 1052 1053 deltams = INFTIM; 1054 memset(&pfd, 0, sizeof pfd); 1055 pfd.fd = conn->sd; 1056 pfd.events = POLLIN | POLLERR; 1057 1058 for (;;) { 1059 /* 1060 * The socket is non-blocking. Instead of the canonical 1061 * poll() -> read(), we do the following: 1062 * 1063 * 1) call read() or SSL_read(). 1064 * 2) if we received some data, return it. 1065 * 3) if an error occurred, return -1. 1066 * 4) if read() or SSL_read() signaled EOF, return. 1067 * 5) if we did not receive any data but we're not at EOF, 1068 * call poll(). 1069 * 1070 * In the SSL case, this is necessary because if we 1071 * receive a close notification, we have to call 1072 * SSL_read() one additional time after we've read 1073 * everything we received. 1074 * 1075 * In the non-SSL case, it may improve performance (very 1076 * slightly) when reading small amounts of data. 1077 */ 1078#ifdef WITH_SSL 1079 if (conn->ssl != NULL) 1080 rlen = fetch_ssl_read(conn->ssl, buf, len); 1081 else 1082#endif 1083 rlen = fetch_socket_read(conn->sd, buf, len); 1084 if (rlen >= 0) { 1085 break; 1086 } else if (rlen == FETCH_READ_ERROR) { 1087 fetch_syserr(); 1088 return (-1); 1089 } 1090 // assert(rlen == FETCH_READ_WAIT); 1091 if (fetchTimeout > 0) { 1092 gettimeofday(&now, NULL); 1093 if (!timercmp(&timeout, &now, >)) { 1094 errno = ETIMEDOUT; 1095 fetch_syserr(); 1096 return (-1); 1097 } 1098 timersub(&timeout, &now, &delta); 1099 deltams = delta.tv_sec * 1000 + 1100 delta.tv_usec / 1000;; 1101 } 1102 errno = 0; 1103 pfd.revents = 0; 1104 if (poll(&pfd, 1, deltams) < 0) { 1105 if (errno == EINTR && fetchRestartCalls) 1106 continue; 1107 fetch_syserr(); 1108 return (-1); 1109 } 1110 } 1111 return (rlen); 1112} 1113 1114 1115/* 1116 * Read a line of text from a connection w/ timeout 1117 */ 1118#define MIN_BUF_SIZE 1024 1119 1120int 1121fetch_getln(conn_t *conn) 1122{ 1123 char *tmp; 1124 size_t tmpsize; 1125 ssize_t len; 1126 char c; 1127 1128 if (conn->buf == NULL) { 1129 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 1130 errno = ENOMEM; 1131 return (-1); 1132 } 1133 conn->bufsize = MIN_BUF_SIZE; 1134 } 1135 1136 conn->buf[0] = '\0'; 1137 conn->buflen = 0; 1138 1139 do { 1140 len = fetch_read(conn, &c, 1); 1141 if (len == -1) 1142 return (-1); 1143 if (len == 0) 1144 break; 1145 conn->buf[conn->buflen++] = c; 1146 if (conn->buflen == conn->bufsize) { 1147 tmp = conn->buf; 1148 tmpsize = conn->bufsize * 2 + 1; 1149 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 1150 errno = ENOMEM; 1151 return (-1); 1152 } 1153 conn->buf = tmp; 1154 conn->bufsize = tmpsize; 1155 } 1156 } while (c != '\n'); 1157 1158 conn->buf[conn->buflen] = '\0'; 1159 DEBUGF("<<< %s", conn->buf); 1160 return (0); 1161} 1162 1163 1164/* 1165 * Write to a connection w/ timeout 1166 */ 1167ssize_t 1168fetch_write(conn_t *conn, const char *buf, size_t len) 1169{ 1170 struct iovec iov; 1171 1172 iov.iov_base = __DECONST(char *, buf); 1173 iov.iov_len = len; 1174 return fetch_writev(conn, &iov, 1); 1175} 1176 1177/* 1178 * Write a vector to a connection w/ timeout 1179 * Note: can modify the iovec. 1180 */ 1181ssize_t 1182fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1183{ 1184 struct timeval now, timeout, delta; 1185 struct pollfd pfd; 1186 ssize_t wlen, total; 1187 int deltams; 1188 1189 memset(&pfd, 0, sizeof pfd); 1190 if (fetchTimeout) { 1191 pfd.fd = conn->sd; 1192 pfd.events = POLLOUT | POLLERR; 1193 gettimeofday(&timeout, NULL); 1194 timeout.tv_sec += fetchTimeout; 1195 } 1196 1197 total = 0; 1198 while (iovcnt > 0) { 1199 while (fetchTimeout && pfd.revents == 0) { 1200 gettimeofday(&now, NULL); 1201 if (!timercmp(&timeout, &now, >)) { 1202 errno = ETIMEDOUT; 1203 fetch_syserr(); 1204 return (-1); 1205 } 1206 timersub(&timeout, &now, &delta); 1207 deltams = delta.tv_sec * 1000 + 1208 delta.tv_usec / 1000; 1209 errno = 0; 1210 pfd.revents = 0; 1211 if (poll(&pfd, 1, deltams) < 0) { 1212 /* POSIX compliance */ 1213 if (errno == EAGAIN) 1214 continue; 1215 if (errno == EINTR && fetchRestartCalls) 1216 continue; 1217 return (-1); 1218 } 1219 } 1220 errno = 0; 1221#ifdef WITH_SSL 1222 if (conn->ssl != NULL) 1223 wlen = SSL_write(conn->ssl, 1224 iov->iov_base, iov->iov_len); 1225 else 1226#endif 1227 wlen = writev(conn->sd, iov, iovcnt); 1228 if (wlen == 0) { 1229 /* we consider a short write a failure */ 1230 /* XXX perhaps we shouldn't in the SSL case */ 1231 errno = EPIPE; 1232 fetch_syserr(); 1233 return (-1); 1234 } 1235 if (wlen < 0) { 1236 if (errno == EINTR && fetchRestartCalls) 1237 continue; 1238 return (-1); 1239 } 1240 total += wlen; 1241 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1242 wlen -= iov->iov_len; 1243 iov++; 1244 iovcnt--; 1245 } 1246 if (iovcnt > 0) { 1247 iov->iov_len -= wlen; 1248 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1249 } 1250 } 1251 return (total); 1252} 1253 1254 1255/* 1256 * Write a line of text to a connection w/ timeout 1257 */ 1258int 1259fetch_putln(conn_t *conn, const char *str, size_t len) 1260{ 1261 struct iovec iov[2]; 1262 int ret; 1263 1264 DEBUGF(">>> %s\n", str); 1265 iov[0].iov_base = __DECONST(char *, str); 1266 iov[0].iov_len = len; 1267 iov[1].iov_base = __DECONST(char *, ENDL); 1268 iov[1].iov_len = sizeof(ENDL); 1269 if (len == 0) 1270 ret = fetch_writev(conn, &iov[1], 1); 1271 else 1272 ret = fetch_writev(conn, iov, 2); 1273 if (ret == -1) 1274 return (-1); 1275 return (0); 1276} 1277 1278 1279/* 1280 * Close connection 1281 */ 1282int 1283fetch_close(conn_t *conn) 1284{ 1285 int ret; 1286 1287 if (--conn->ref > 0) 1288 return (0); 1289#ifdef WITH_SSL 1290 if (conn->ssl) { 1291 SSL_shutdown(conn->ssl); 1292 SSL_set_connect_state(conn->ssl); 1293 SSL_free(conn->ssl); 1294 conn->ssl = NULL; 1295 } 1296 if (conn->ssl_ctx) { 1297 SSL_CTX_free(conn->ssl_ctx); 1298 conn->ssl_ctx = NULL; 1299 } 1300 if (conn->ssl_cert) { 1301 X509_free(conn->ssl_cert); 1302 conn->ssl_cert = NULL; 1303 } 1304#endif 1305 ret = close(conn->sd); 1306 free(conn->buf); 1307 free(conn); 1308 return (ret); 1309} 1310 1311 1312/*** Directory-related utility functions *************************************/ 1313 1314int 1315fetch_add_entry(struct url_ent **p, int *size, int *len, 1316 const char *name, struct url_stat *us) 1317{ 1318 struct url_ent *tmp; 1319 1320 if (*p == NULL) { 1321 *size = 0; 1322 *len = 0; 1323 } 1324 1325 if (*len >= *size - 1) { 1326 tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p)); 1327 if (tmp == NULL) { 1328 errno = ENOMEM; 1329 fetch_syserr(); 1330 return (-1); 1331 } 1332 *size = (*size * 2 + 1); 1333 *p = tmp; 1334 } 1335 1336 tmp = *p + *len; 1337 snprintf(tmp->name, PATH_MAX, "%s", name); 1338 memcpy(&tmp->stat, us, sizeof(*us)); 1339 1340 (*len)++; 1341 (++tmp)->name[0] = 0; 1342 1343 return (0); 1344} 1345 1346 1347/*** Authentication-related utility functions ********************************/ 1348 1349static const char * 1350fetch_read_word(FILE *f) 1351{ 1352 static char word[1024]; 1353 1354 if (fscanf(f, " %1023s ", word) != 1) 1355 return (NULL); 1356 return (word); 1357} 1358 1359static int 1360fetch_netrc_open(void) 1361{ 1362 struct passwd *pwd; 1363 char fn[PATH_MAX]; 1364 const char *p; 1365 int fd, serrno; 1366 1367 if ((p = getenv("NETRC")) != NULL) { 1368 DEBUGF("NETRC=%s\n", p); 1369 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1370 fetch_info("$NETRC specifies a file name " 1371 "longer than PATH_MAX"); 1372 return (-1); 1373 } 1374 } else { 1375 if ((p = getenv("HOME")) == NULL) { 1376 if ((pwd = getpwuid(getuid())) == NULL || 1377 (p = pwd->pw_dir) == NULL) 1378 return (-1); 1379 } 1380 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1381 return (-1); 1382 } 1383 1384 if ((fd = open(fn, O_RDONLY)) < 0) { 1385 serrno = errno; 1386 DEBUGF("%s: %s\n", fn, strerror(serrno)); 1387 errno = serrno; 1388 } 1389 return (fd); 1390} 1391 1392/* 1393 * Get authentication data for a URL from .netrc 1394 */ 1395int 1396fetch_netrc_auth(struct url *url) 1397{ 1398 const char *word; 1399 int serrno; 1400 FILE *f; 1401 1402 if (url->netrcfd < 0) 1403 url->netrcfd = fetch_netrc_open(); 1404 if (url->netrcfd < 0) 1405 return (-1); 1406 if ((f = fdopen(url->netrcfd, "r")) == NULL) { 1407 serrno = errno; 1408 DEBUGF("fdopen(netrcfd): %s", strerror(errno)); 1409 close(url->netrcfd); 1410 url->netrcfd = -1; 1411 errno = serrno; 1412 return (-1); 1413 } 1414 rewind(f); 1415 DEBUGF("searching netrc for %s\n", url->host); 1416 while ((word = fetch_read_word(f)) != NULL) { 1417 if (strcmp(word, "default") == 0) { 1418 DEBUGF("using default netrc settings\n"); 1419 break; 1420 } 1421 if (strcmp(word, "machine") == 0 && 1422 (word = fetch_read_word(f)) != NULL && 1423 strcasecmp(word, url->host) == 0) { 1424 DEBUGF("using netrc settings for %s\n", word); 1425 break; 1426 } 1427 } 1428 if (word == NULL) 1429 goto ferr; 1430 while ((word = fetch_read_word(f)) != NULL) { 1431 if (strcmp(word, "login") == 0) { 1432 if ((word = fetch_read_word(f)) == NULL) 1433 goto ferr; 1434 if (snprintf(url->user, sizeof(url->user), 1435 "%s", word) > (int)sizeof(url->user)) { 1436 fetch_info("login name in .netrc is too long"); 1437 url->user[0] = '\0'; 1438 } 1439 } else if (strcmp(word, "password") == 0) { 1440 if ((word = fetch_read_word(f)) == NULL) 1441 goto ferr; 1442 if (snprintf(url->pwd, sizeof(url->pwd), 1443 "%s", word) > (int)sizeof(url->pwd)) { 1444 fetch_info("password in .netrc is too long"); 1445 url->pwd[0] = '\0'; 1446 } 1447 } else if (strcmp(word, "account") == 0) { 1448 if ((word = fetch_read_word(f)) == NULL) 1449 goto ferr; 1450 /* XXX not supported! */ 1451 } else { 1452 break; 1453 } 1454 } 1455 fclose(f); 1456 url->netrcfd = -1; 1457 return (0); 1458ferr: 1459 serrno = errno; 1460 fclose(f); 1461 url->netrcfd = -1; 1462 errno = serrno; 1463 return (-1); 1464} 1465 1466/* 1467 * The no_proxy environment variable specifies a set of domains for 1468 * which the proxy should not be consulted; the contents is a comma-, 1469 * or space-separated list of domain names. A single asterisk will 1470 * override all proxy variables and no transactions will be proxied 1471 * (for compatibility with lynx and curl, see the discussion at 1472 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1473 */ 1474int 1475fetch_no_proxy_match(const char *host) 1476{ 1477 const char *no_proxy, *p, *q; 1478 size_t h_len, d_len; 1479 1480 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1481 (no_proxy = getenv("no_proxy")) == NULL) 1482 return (0); 1483 1484 /* asterisk matches any hostname */ 1485 if (strcmp(no_proxy, "*") == 0) 1486 return (1); 1487 1488 h_len = strlen(host); 1489 p = no_proxy; 1490 do { 1491 /* position p at the beginning of a domain suffix */ 1492 while (*p == ',' || isspace((unsigned char)*p)) 1493 p++; 1494 1495 /* position q at the first separator character */ 1496 for (q = p; *q; ++q) 1497 if (*q == ',' || isspace((unsigned char)*q)) 1498 break; 1499 1500 d_len = q - p; 1501 if (d_len > 0 && h_len >= d_len && 1502 strncasecmp(host + h_len - d_len, 1503 p, d_len) == 0) { 1504 /* domain name matches */ 1505 return (1); 1506 } 1507 1508 p = q + 1; 1509 } while (*q); 1510 1511 return (0); 1512} 1513