common.c revision 268671
1204431Sraj/*- 2204431Sraj * Copyright (c) 1998-2014 Dag-Erling Sm��rgrav 3204431Sraj * Copyright (c) 2013 Michael Gmelin <freebsd@grem.de> 4204431Sraj * All rights reserved. 5204431Sraj * 6204431Sraj * Redistribution and use in source and binary forms, with or without 7204431Sraj * modification, are permitted provided that the following conditions 8204431Sraj * are met: 9204431Sraj * 1. Redistributions of source code must retain the above copyright 10204431Sraj * notice, this list of conditions and the following disclaimer 11204431Sraj * in this position and unchanged. 12204431Sraj * 2. Redistributions in binary form must reproduce the above copyright 13204431Sraj * notice, this list of conditions and the following disclaimer in the 14204431Sraj * documentation and/or other materials provided with the distribution. 15204431Sraj * 3. The name of the author may not be used to endorse or promote products 16204431Sraj * derived from this software without specific prior written permission 17204431Sraj * 18204431Sraj * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19204431Sraj * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20204431Sraj * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21204431Sraj * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22204431Sraj * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23204431Sraj * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24204431Sraj * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25204431Sraj * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26204431Sraj * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27204431Sraj * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28204431Sraj */ 29204431Sraj 30204431Sraj#include <sys/cdefs.h> 31204431Sraj__FBSDID("$FreeBSD: head/lib/libfetch/common.c 268671 2014-07-15 15:29:43Z bapt $"); 32204431Sraj 33204431Sraj#include <sys/param.h> 34204431Sraj#include <sys/socket.h> 35204431Sraj#include <sys/time.h> 36204431Sraj#include <sys/uio.h> 37204431Sraj 38204431Sraj#include <netinet/in.h> 39204431Sraj 40204431Sraj#include <ctype.h> 41204431Sraj#include <errno.h> 42204431Sraj#include <fcntl.h> 43204431Sraj#include <netdb.h> 44204431Sraj#include <poll.h> 45204431Sraj#include <pwd.h> 46204431Sraj#include <stdarg.h> 47204431Sraj#include <stdlib.h> 48204431Sraj#include <stdio.h> 49204431Sraj#include <string.h> 50204431Sraj#include <unistd.h> 51204431Sraj 52204431Sraj#ifdef WITH_SSL 53204431Sraj#include <openssl/x509v3.h> 54204431Sraj#endif 55204431Sraj 56204431Sraj#include "fetch.h" 57204431Sraj#include "common.h" 58204431Sraj 59204431Sraj 60204431Sraj/*** Local data **************************************************************/ 61204431Sraj 62204431Sraj/* 63204431Sraj * Error messages for resolver errors 64204431Sraj */ 65204431Srajstatic struct fetcherr netdb_errlist[] = { 66204431Sraj#ifdef EAI_NODATA 67204431Sraj { EAI_NODATA, FETCH_RESOLV, "Host not found" }, 68204431Sraj#endif 69204431Sraj { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 70204431Sraj { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 71204431Sraj { EAI_NONAME, FETCH_RESOLV, "No address record" }, 72204431Sraj { -1, FETCH_UNKNOWN, "Unknown resolver error" } 73204431Sraj}; 74204431Sraj 75204431Sraj/* End-of-Line */ 76204431Srajstatic const char ENDL[2] = "\r\n"; 77204431Sraj 78204431Sraj 79204431Sraj/*** Error-reporting functions ***********************************************/ 80204431Sraj 81204431Sraj/* 82204431Sraj * Map error code to string 83204431Sraj */ 84204431Srajstatic struct fetcherr * 85204431Srajfetch_finderr(struct fetcherr *p, int e) 86204431Sraj{ 87204431Sraj while (p->num != -1 && p->num != e) 88204431Sraj p++; 89204431Sraj return (p); 90204431Sraj} 91204431Sraj 92204431Sraj/* 93204431Sraj * Set error code 94204431Sraj */ 95204431Srajvoid 96204431Srajfetch_seterr(struct fetcherr *p, int e) 97204431Sraj{ 98204431Sraj p = fetch_finderr(p, e); 99204431Sraj fetchLastErrCode = p->cat; 100204431Sraj snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 101204431Sraj} 102204431Sraj 103204431Sraj/* 104204431Sraj * Set error code according to errno 105204431Sraj */ 106204431Srajvoid 107204431Srajfetch_syserr(void) 108204431Sraj{ 109204431Sraj switch (errno) { 110204431Sraj case 0: 111204431Sraj fetchLastErrCode = FETCH_OK; 112204431Sraj break; 113204431Sraj case EPERM: 114204431Sraj case EACCES: 115204431Sraj case EROFS: 116204431Sraj case EAUTH: 117204431Sraj case ENEEDAUTH: 118204431Sraj fetchLastErrCode = FETCH_AUTH; 119204431Sraj break; 120204431Sraj case ENOENT: 121204431Sraj case EISDIR: /* XXX */ 122204431Sraj fetchLastErrCode = FETCH_UNAVAIL; 123204431Sraj break; 124204431Sraj case ENOMEM: 125204431Sraj fetchLastErrCode = FETCH_MEMORY; 126204431Sraj break; 127204431Sraj case EBUSY: 128204431Sraj case EAGAIN: 129204431Sraj fetchLastErrCode = FETCH_TEMP; 130204431Sraj break; 131204431Sraj case EEXIST: 132204431Sraj fetchLastErrCode = FETCH_EXISTS; 133204431Sraj break; 134204431Sraj case ENOSPC: 135204431Sraj fetchLastErrCode = FETCH_FULL; 136204431Sraj break; 137204431Sraj case EADDRINUSE: 138204431Sraj case EADDRNOTAVAIL: 139204431Sraj case ENETDOWN: 140204431Sraj case ENETUNREACH: 141204431Sraj case ENETRESET: 142204431Sraj case EHOSTUNREACH: 143204431Sraj fetchLastErrCode = FETCH_NETWORK; 144204431Sraj break; 145204431Sraj case ECONNABORTED: 146204431Sraj case ECONNRESET: 147204431Sraj fetchLastErrCode = FETCH_ABORT; 148204431Sraj break; 149204431Sraj case ETIMEDOUT: 150204431Sraj fetchLastErrCode = FETCH_TIMEOUT; 151204431Sraj break; 152204431Sraj case ECONNREFUSED: 153204431Sraj case EHOSTDOWN: 154204431Sraj fetchLastErrCode = FETCH_DOWN; 155204431Sraj break; 156204431Srajdefault: 157204431Sraj fetchLastErrCode = FETCH_UNKNOWN; 158204431Sraj } 159204431Sraj snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); 160204431Sraj} 161204431Sraj 162204431Sraj 163204431Sraj/* 164204431Sraj * Emit status message 165204431Sraj */ 166204431Srajvoid 167204431Srajfetch_info(const char *fmt, ...) 168204431Sraj{ 169204431Sraj va_list ap; 170204431Sraj 171204431Sraj va_start(ap, fmt); 172204431Sraj vfprintf(stderr, fmt, ap); 173204431Sraj va_end(ap); 174204431Sraj fputc('\n', stderr); 175204431Sraj} 176204431Sraj 177204431Sraj 178204431Sraj/*** Network-related utility functions ***************************************/ 179204431Sraj 180204431Sraj/* 181204431Sraj * Return the default port for a scheme 182204431Sraj */ 183204431Srajint 184204431Srajfetch_default_port(const char *scheme) 185204431Sraj{ 186204431Sraj struct servent *se; 187204431Sraj 188204431Sraj if ((se = getservbyname(scheme, "tcp")) != NULL) 189204431Sraj return (ntohs(se->s_port)); 190204431Sraj if (strcasecmp(scheme, SCHEME_FTP) == 0) 191204431Sraj return (FTP_DEFAULT_PORT); 192204431Sraj if (strcasecmp(scheme, SCHEME_HTTP) == 0) 193204431Sraj return (HTTP_DEFAULT_PORT); 194204431Sraj return (0); 195204431Sraj} 196204431Sraj 197204431Sraj/* 198204431Sraj * Return the default proxy port for a scheme 199204431Sraj */ 200204431Srajint 201204431Srajfetch_default_proxy_port(const char *scheme) 202204431Sraj{ 203204431Sraj if (strcasecmp(scheme, SCHEME_FTP) == 0) 204204431Sraj return (FTP_DEFAULT_PROXY_PORT); 205204431Sraj if (strcasecmp(scheme, SCHEME_HTTP) == 0) 206204431Sraj return (HTTP_DEFAULT_PROXY_PORT); 207204431Sraj return (0); 208204431Sraj} 209204431Sraj 210204431Sraj 211204431Sraj/* 212204431Sraj * Create a connection for an existing descriptor. 213204431Sraj */ 214204431Srajconn_t * 215204431Srajfetch_reopen(int sd) 216204431Sraj{ 217204431Sraj conn_t *conn; 218204431Sraj int opt = 1; 219204431Sraj 220204431Sraj /* allocate and fill connection structure */ 221204431Sraj if ((conn = calloc(1, sizeof(*conn))) == NULL) 222204431Sraj return (NULL); 223204431Sraj fcntl(sd, F_SETFD, FD_CLOEXEC); 224204431Sraj setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof opt); 225204431Sraj conn->sd = sd; 226204431Sraj ++conn->ref; 227204431Sraj return (conn); 228204431Sraj} 229204431Sraj 230204431Sraj 231204431Sraj/* 232204431Sraj * Bump a connection's reference count. 233204431Sraj */ 234204431Srajconn_t * 235204431Srajfetch_ref(conn_t *conn) 236204431Sraj{ 237204431Sraj 238204431Sraj ++conn->ref; 239204431Sraj return (conn); 240204431Sraj} 241204431Sraj 242204431Sraj 243204431Sraj/* 244204431Sraj * Bind a socket to a specific local address 245204431Sraj */ 246204431Srajint 247204431Srajfetch_bind(int sd, int af, const char *addr) 248204431Sraj{ 249204431Sraj struct addrinfo hints, *res, *res0; 250204431Sraj int err; 251204431Sraj 252204431Sraj memset(&hints, 0, sizeof(hints)); 253204431Sraj hints.ai_family = af; 254204431Sraj hints.ai_socktype = SOCK_STREAM; 255204431Sraj hints.ai_protocol = 0; 256204431Sraj if ((err = getaddrinfo(addr, NULL, &hints, &res0)) != 0) 257204431Sraj return (-1); 258204431Sraj for (res = res0; res; res = res->ai_next) 259204431Sraj if (bind(sd, res->ai_addr, res->ai_addrlen) == 0) 260204431Sraj return (0); 261204431Sraj return (-1); 262204431Sraj} 263204431Sraj 264204431Sraj 265204431Sraj/* 266204431Sraj * Establish a TCP connection to the specified port on the specified host. 267204431Sraj */ 268204431Srajconn_t * 269204431Srajfetch_connect(const char *host, int port, int af, int verbose) 270204431Sraj{ 271204431Sraj conn_t *conn; 272204431Sraj char pbuf[10]; 273204431Sraj const char *bindaddr; 274204431Sraj struct addrinfo hints, *res, *res0; 275204431Sraj int sd, err; 276204431Sraj 277204431Sraj DEBUG(fprintf(stderr, "---> %s:%d\n", host, port)); 278204431Sraj 279204431Sraj if (verbose) 280204431Sraj fetch_info("looking up %s", host); 281204431Sraj 282204431Sraj /* look up host name and set up socket address structure */ 283204431Sraj snprintf(pbuf, sizeof(pbuf), "%d", port); 284204431Sraj memset(&hints, 0, sizeof(hints)); 285204431Sraj hints.ai_family = af; 286204431Sraj hints.ai_socktype = SOCK_STREAM; 287204431Sraj hints.ai_protocol = 0; 288204431Sraj if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) { 289204431Sraj netdb_seterr(err); 290204431Sraj return (NULL); 291204431Sraj } 292204431Sraj bindaddr = getenv("FETCH_BIND_ADDRESS"); 293204431Sraj 294204431Sraj if (verbose) 295204431Sraj fetch_info("connecting to %s:%d", host, port); 296204431Sraj 297204431Sraj /* try to connect */ 298204431Sraj for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) { 299204431Sraj if ((sd = socket(res->ai_family, res->ai_socktype, 300204431Sraj res->ai_protocol)) == -1) 301204431Sraj continue; 302204431Sraj if (bindaddr != NULL && *bindaddr != '\0' && 303204431Sraj fetch_bind(sd, res->ai_family, bindaddr) != 0) { 304204431Sraj fetch_info("failed to bind to '%s'", bindaddr); 305204431Sraj close(sd); 306204431Sraj continue; 307204431Sraj } 308204431Sraj if (connect(sd, res->ai_addr, res->ai_addrlen) == 0 && 309204431Sraj fcntl(sd, F_SETFL, O_NONBLOCK) == 0) 310204431Sraj break; 311204431Sraj close(sd); 312204431Sraj } 313204431Sraj freeaddrinfo(res0); 314204431Sraj if (sd == -1) { 315204431Sraj fetch_syserr(); 316204431Sraj return (NULL); 317204431Sraj } 318204431Sraj 319204431Sraj if ((conn = fetch_reopen(sd)) == NULL) { 320204431Sraj fetch_syserr(); 321204431Sraj close(sd); 322204431Sraj } 323204431Sraj return (conn); 324204431Sraj} 325204431Sraj 326204431Sraj#ifdef WITH_SSL 327204431Sraj/* 328204431Sraj * Convert characters A-Z to lowercase (intentionally avoid any locale 329204431Sraj * specific conversions). 330204431Sraj */ 331204431Srajstatic char 332204431Srajfetch_ssl_tolower(char in) 333204431Sraj{ 334204431Sraj if (in >= 'A' && in <= 'Z') 335204431Sraj return (in + 32); 336204431Sraj else 337204431Sraj return (in); 338204431Sraj} 339204431Sraj 340204431Sraj/* 341 * isalpha implementation that intentionally avoids any locale specific 342 * conversions. 343 */ 344static int 345fetch_ssl_isalpha(char in) 346{ 347 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 348} 349 350/* 351 * Check if passed hostnames a and b are equal. 352 */ 353static int 354fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 355 size_t blen) 356{ 357 size_t i; 358 359 if (alen != blen) 360 return (0); 361 for (i = 0; i < alen; ++i) { 362 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 363 return (0); 364 } 365 return (1); 366} 367 368/* 369 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 370 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 371 * numeric characters. Double hyphens (like they're found in IDN a-labels 372 * 'xn--') are not allowed. Empty labels are invalid. 373 */ 374static int 375fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 376{ 377 size_t i; 378 379 if (!len || l[0] == '-' || l[len-1] == '-') 380 return (0); 381 for (i = 0; i < len; ++i) { 382 if (!isdigit(l[i]) && 383 !fetch_ssl_isalpha(l[i]) && 384 !(l[i] == '*' && wcok) && 385 !(l[i] == '-' && l[i - 1] != '-')) 386 return (0); 387 } 388 return (1); 389} 390 391/* 392 * Check if host name consists only of numbers. This might indicate an IP 393 * address, which is not a good idea for CN wildcard comparison. 394 */ 395static int 396fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 397{ 398 size_t i; 399 400 for (i = 0; i < len; ++i) { 401 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 402 hostname[i] == '.')) 403 return (0); 404 } 405 return (1); 406} 407 408/* 409 * Check if the host name h passed matches the pattern passed in m which 410 * is usually part of subjectAltName or CN of a certificate presented to 411 * the client. This includes wildcard matching. The algorithm is based on 412 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 413 */ 414static int 415fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 416 size_t mlen) 417{ 418 int delta, hdotidx, mdot1idx, wcidx; 419 const char *hdot, *mdot1, *mdot2; 420 const char *wc; /* wildcard */ 421 422 if (!(h && *h && m && *m)) 423 return (0); 424 if ((wc = strnstr(m, "*", mlen)) == NULL) 425 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 426 wcidx = wc - m; 427 /* hostname should not be just dots and numbers */ 428 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 429 return (0); 430 /* only one wildcard allowed in pattern */ 431 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 432 return (0); 433 /* 434 * there must be at least two more domain labels and 435 * wildcard has to be in the leftmost label (RFC6125) 436 */ 437 mdot1 = strnstr(m, ".", mlen); 438 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 439 return (0); 440 mdot1idx = mdot1 - m; 441 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 442 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 443 return (0); 444 /* hostname must contain a dot and not be the 1st char */ 445 hdot = strnstr(h, ".", hlen); 446 if (hdot == NULL || hdot == h) 447 return (0); 448 hdotidx = hdot - h; 449 /* 450 * host part of hostname must be at least as long as 451 * pattern it's supposed to match 452 */ 453 if (hdotidx < mdot1idx) 454 return (0); 455 /* 456 * don't allow wildcards in non-traditional domain names 457 * (IDN, A-label, U-label...) 458 */ 459 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 460 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 461 return (0); 462 /* match domain part (part after first dot) */ 463 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 464 mlen - mdot1idx)) 465 return (0); 466 /* match part left of wildcard */ 467 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 468 return (0); 469 /* match part right of wildcard */ 470 delta = mdot1idx - wcidx - 1; 471 if (!fetch_ssl_hname_equal(hdot - delta, delta, 472 mdot1 - delta, delta)) 473 return (0); 474 /* all tests succeded, it's a match */ 475 return (1); 476} 477 478/* 479 * Get numeric host address info - returns NULL if host was not an IP 480 * address. The caller is responsible for deallocation using 481 * freeaddrinfo(3). 482 */ 483static struct addrinfo * 484fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 485{ 486 struct addrinfo hints, *res; 487 char *host; 488 489 host = (char *)malloc(len + 1); 490 memcpy(host, hostname, len); 491 host[len] = '\0'; 492 memset(&hints, 0, sizeof(hints)); 493 hints.ai_family = PF_UNSPEC; 494 hints.ai_socktype = SOCK_STREAM; 495 hints.ai_protocol = 0; 496 hints.ai_flags = AI_NUMERICHOST; 497 /* port is not relevant for this purpose */ 498 getaddrinfo(host, "443", &hints, &res); 499 free(host); 500 return res; 501} 502 503/* 504 * Compare ip address in addrinfo with address passes. 505 */ 506static int 507fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 508 size_t rhostlen) 509{ 510 const void *left; 511 512 if (lhost->ai_family == AF_INET && rhostlen == 4) { 513 left = (void *)&((struct sockaddr_in*)(void *) 514 lhost->ai_addr)->sin_addr.s_addr; 515#ifdef INET6 516 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 517 left = (void *)&((struct sockaddr_in6 *)(void *) 518 lhost->ai_addr)->sin6_addr; 519#endif 520 } else 521 return (0); 522 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 523} 524 525/* 526 * Compare ip address in addrinfo with host passed. If host is not an IP 527 * address, comparison will fail. 528 */ 529static int 530fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 531 size_t rlen) 532{ 533 struct addrinfo *raddr; 534 int ret; 535 char *rip; 536 537 ret = 0; 538 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 539 return 0; /* not a numeric host */ 540 541 if (laddr->ai_family == raddr->ai_family) { 542 if (laddr->ai_family == AF_INET) { 543 rip = (char *)&((struct sockaddr_in *)(void *) 544 raddr->ai_addr)->sin_addr.s_addr; 545 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 546#ifdef INET6 547 } else if (laddr->ai_family == AF_INET6) { 548 rip = (char *)&((struct sockaddr_in6 *)(void *) 549 raddr->ai_addr)->sin6_addr; 550 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 551#endif 552 } 553 554 } 555 freeaddrinfo(raddr); 556 return (ret); 557} 558 559/* 560 * Verify server certificate by subjectAltName. 561 */ 562static int 563fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 564 const char *host, struct addrinfo *ip) 565{ 566 const GENERAL_NAME *name; 567 size_t nslen; 568 int i; 569 const char *ns; 570 571 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 572#if OPENSSL_VERSION_NUMBER < 0x10000000L 573 /* 574 * This is a workaround, since the following line causes 575 * alignment issues in clang: 576 * name = sk_GENERAL_NAME_value(altnames, i); 577 * OpenSSL explicitly warns not to use those macros 578 * directly, but there isn't much choice (and there 579 * shouldn't be any ill side effects) 580 */ 581 name = (GENERAL_NAME *)SKM_sk_value(void, altnames, i); 582#else 583 name = sk_GENERAL_NAME_value(altnames, i); 584#endif 585 ns = (const char *)ASN1_STRING_data(name->d.ia5); 586 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 587 588 if (name->type == GEN_DNS && ip == NULL && 589 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 590 return (1); 591 else if (name->type == GEN_IPADD && ip != NULL && 592 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 593 return (1); 594 } 595 return (0); 596} 597 598/* 599 * Verify server certificate by CN. 600 */ 601static int 602fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 603 struct addrinfo *ip) 604{ 605 ASN1_STRING *namedata; 606 X509_NAME_ENTRY *nameentry; 607 int cnlen, lastpos, loc, ret; 608 unsigned char *cn; 609 610 ret = 0; 611 lastpos = -1; 612 loc = -1; 613 cn = NULL; 614 /* get most specific CN (last entry in list) and compare */ 615 while ((lastpos = X509_NAME_get_index_by_NID(subject, 616 NID_commonName, lastpos)) != -1) 617 loc = lastpos; 618 619 if (loc > -1) { 620 nameentry = X509_NAME_get_entry(subject, loc); 621 namedata = X509_NAME_ENTRY_get_data(nameentry); 622 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 623 if (ip == NULL && 624 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 625 ret = 1; 626 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 627 ret = 1; 628 OPENSSL_free(cn); 629 } 630 return (ret); 631} 632 633/* 634 * Verify that server certificate subjectAltName/CN matches 635 * hostname. First check, if there are alternative subject names. If yes, 636 * those have to match. Only if those don't exist it falls back to 637 * checking the subject's CN. 638 */ 639static int 640fetch_ssl_verify_hname(X509 *cert, const char *host) 641{ 642 struct addrinfo *ip; 643 STACK_OF(GENERAL_NAME) *altnames; 644 X509_NAME *subject; 645 int ret; 646 647 ret = 0; 648 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 649 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 650 NULL, NULL); 651 652 if (altnames != NULL) { 653 ret = fetch_ssl_verify_altname(altnames, host, ip); 654 } else { 655 subject = X509_get_subject_name(cert); 656 if (subject != NULL) 657 ret = fetch_ssl_verify_cn(subject, host, ip); 658 } 659 660 if (ip != NULL) 661 freeaddrinfo(ip); 662 if (altnames != NULL) 663 GENERAL_NAMES_free(altnames); 664 return (ret); 665} 666 667/* 668 * Configure transport security layer based on environment. 669 */ 670static void 671fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 672{ 673 long ssl_ctx_options; 674 675 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_TICKET; 676 if (getenv("SSL_ALLOW_SSL2") == NULL) 677 ssl_ctx_options |= SSL_OP_NO_SSLv2; 678 if (getenv("SSL_NO_SSL3") != NULL) 679 ssl_ctx_options |= SSL_OP_NO_SSLv3; 680 if (getenv("SSL_NO_TLS1") != NULL) 681 ssl_ctx_options |= SSL_OP_NO_TLSv1; 682 if (verbose) 683 fetch_info("SSL options: %lx", ssl_ctx_options); 684 SSL_CTX_set_options(ctx, ssl_ctx_options); 685} 686 687 688/* 689 * Configure peer verification based on environment. 690 */ 691#define LOCAL_CERT_FILE "/usr/local/etc/ssl/cert.pem" 692#define BASE_CERT_FILE "/etc/ssl/cert.pem" 693static int 694fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 695{ 696 X509_LOOKUP *crl_lookup; 697 X509_STORE *crl_store; 698 const char *ca_cert_file, *ca_cert_path, *crl_file; 699 700 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 701 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 702 if (ca_cert_file == NULL && 703 access(LOCAL_CERT_FILE, R_OK) == 0) 704 ca_cert_file = LOCAL_CERT_FILE; 705 if (ca_cert_file == NULL) 706 ca_cert_file = BASE_CERT_FILE; 707 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 708 if (verbose) { 709 fetch_info("Peer verification enabled"); 710 if (ca_cert_file != NULL) 711 fetch_info("Using CA cert file: %s", 712 ca_cert_file); 713 if (ca_cert_path != NULL) 714 fetch_info("Using CA cert path: %s", 715 ca_cert_path); 716 } 717 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 718 fetch_ssl_cb_verify_crt); 719 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 720 ca_cert_path); 721 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 722 if (verbose) 723 fetch_info("Using CRL file: %s", crl_file); 724 crl_store = SSL_CTX_get_cert_store(ctx); 725 crl_lookup = X509_STORE_add_lookup(crl_store, 726 X509_LOOKUP_file()); 727 if (crl_lookup == NULL || 728 !X509_load_crl_file(crl_lookup, crl_file, 729 X509_FILETYPE_PEM)) { 730 fprintf(stderr, 731 "Could not load CRL file %s\n", 732 crl_file); 733 return (0); 734 } 735 X509_STORE_set_flags(crl_store, 736 X509_V_FLAG_CRL_CHECK | 737 X509_V_FLAG_CRL_CHECK_ALL); 738 } 739 } 740 return (1); 741} 742 743/* 744 * Configure client certificate based on environment. 745 */ 746static int 747fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 748{ 749 const char *client_cert_file, *client_key_file; 750 751 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 752 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 753 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 754 if (verbose) { 755 fetch_info("Using client cert file: %s", 756 client_cert_file); 757 fetch_info("Using client key file: %s", 758 client_key_file); 759 } 760 if (SSL_CTX_use_certificate_chain_file(ctx, 761 client_cert_file) != 1) { 762 fprintf(stderr, 763 "Could not load client certificate %s\n", 764 client_cert_file); 765 return (0); 766 } 767 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 768 SSL_FILETYPE_PEM) != 1) { 769 fprintf(stderr, 770 "Could not load client key %s\n", 771 client_key_file); 772 return (0); 773 } 774 } 775 return (1); 776} 777 778/* 779 * Callback for SSL certificate verification, this is called on server 780 * cert verification. It takes no decision, but informs the user in case 781 * verification failed. 782 */ 783int 784fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 785{ 786 X509 *crt; 787 X509_NAME *name; 788 char *str; 789 790 str = NULL; 791 if (!verified) { 792 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 793 (name = X509_get_subject_name(crt)) != NULL) 794 str = X509_NAME_oneline(name, 0, 0); 795 fprintf(stderr, "Certificate verification failed for %s\n", 796 str != NULL ? str : "no relevant certificate"); 797 OPENSSL_free(str); 798 } 799 return (verified); 800} 801 802#endif 803 804/* 805 * Enable SSL on a connection. 806 */ 807int 808fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 809{ 810#ifdef WITH_SSL 811 int ret, ssl_err; 812 X509_NAME *name; 813 char *str; 814 815 /* Init the SSL library and context */ 816 if (!SSL_library_init()){ 817 fprintf(stderr, "SSL library init failed\n"); 818 return (-1); 819 } 820 821 SSL_load_error_strings(); 822 823 conn->ssl_meth = SSLv23_client_method(); 824 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 825 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 826 827 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 828 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 829 return (-1); 830 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 831 return (-1); 832 833 conn->ssl = SSL_new(conn->ssl_ctx); 834 if (conn->ssl == NULL) { 835 fprintf(stderr, "SSL context creation failed\n"); 836 return (-1); 837 } 838 SSL_set_fd(conn->ssl, conn->sd); 839 840#if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT) 841 if (!SSL_set_tlsext_host_name(conn->ssl, 842 __DECONST(struct url *, URL)->host)) { 843 fprintf(stderr, 844 "TLS server name indication extension failed for host %s\n", 845 URL->host); 846 return (-1); 847 } 848#endif 849 while ((ret = SSL_connect(conn->ssl)) == -1) { 850 ssl_err = SSL_get_error(conn->ssl, ret); 851 if (ssl_err != SSL_ERROR_WANT_READ && 852 ssl_err != SSL_ERROR_WANT_WRITE) { 853 ERR_print_errors_fp(stderr); 854 return (-1); 855 } 856 } 857 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 858 859 if (conn->ssl_cert == NULL) { 860 fprintf(stderr, "No server SSL certificate\n"); 861 return (-1); 862 } 863 864 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 865 if (verbose) 866 fetch_info("Verify hostname"); 867 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 868 fprintf(stderr, 869 "SSL certificate subject doesn't match host %s\n", 870 URL->host); 871 return (-1); 872 } 873 } 874 875 if (verbose) { 876 fetch_info("SSL connection established using %s", 877 SSL_get_cipher(conn->ssl)); 878 name = X509_get_subject_name(conn->ssl_cert); 879 str = X509_NAME_oneline(name, 0, 0); 880 fetch_info("Certificate subject: %s", str); 881 OPENSSL_free(str); 882 name = X509_get_issuer_name(conn->ssl_cert); 883 str = X509_NAME_oneline(name, 0, 0); 884 fetch_info("Certificate issuer: %s", str); 885 OPENSSL_free(str); 886 } 887 888 return (0); 889#else 890 (void)conn; 891 (void)verbose; 892 fprintf(stderr, "SSL support disabled\n"); 893 return (-1); 894#endif 895} 896 897#define FETCH_READ_WAIT -2 898#define FETCH_READ_ERROR -1 899#define FETCH_READ_DONE 0 900 901#ifdef WITH_SSL 902static ssize_t 903fetch_ssl_read(SSL *ssl, char *buf, size_t len) 904{ 905 ssize_t rlen; 906 int ssl_err; 907 908 rlen = SSL_read(ssl, buf, len); 909 if (rlen < 0) { 910 ssl_err = SSL_get_error(ssl, rlen); 911 if (ssl_err == SSL_ERROR_WANT_READ || 912 ssl_err == SSL_ERROR_WANT_WRITE) { 913 return (FETCH_READ_WAIT); 914 } else { 915 ERR_print_errors_fp(stderr); 916 return (FETCH_READ_ERROR); 917 } 918 } 919 return (rlen); 920} 921#endif 922 923static ssize_t 924fetch_socket_read(int sd, char *buf, size_t len) 925{ 926 ssize_t rlen; 927 928 rlen = read(sd, buf, len); 929 if (rlen < 0) { 930 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 931 return (FETCH_READ_WAIT); 932 else 933 return (FETCH_READ_ERROR); 934 } 935 return (rlen); 936} 937 938/* 939 * Read a character from a connection w/ timeout 940 */ 941ssize_t 942fetch_read(conn_t *conn, char *buf, size_t len) 943{ 944 struct timeval now, timeout, delta; 945 struct pollfd pfd; 946 ssize_t rlen; 947 int deltams; 948 949 if (fetchTimeout > 0) { 950 gettimeofday(&timeout, NULL); 951 timeout.tv_sec += fetchTimeout; 952 } 953 954 deltams = INFTIM; 955 memset(&pfd, 0, sizeof pfd); 956 pfd.fd = conn->sd; 957 pfd.events = POLLIN | POLLERR; 958 959 for (;;) { 960 /* 961 * The socket is non-blocking. Instead of the canonical 962 * poll() -> read(), we do the following: 963 * 964 * 1) call read() or SSL_read(). 965 * 2) if we received some data, return it. 966 * 3) if an error occurred, return -1. 967 * 4) if read() or SSL_read() signaled EOF, return. 968 * 5) if we did not receive any data but we're not at EOF, 969 * call poll(). 970 * 971 * In the SSL case, this is necessary because if we 972 * receive a close notification, we have to call 973 * SSL_read() one additional time after we've read 974 * everything we received. 975 * 976 * In the non-SSL case, it may improve performance (very 977 * slightly) when reading small amounts of data. 978 */ 979#ifdef WITH_SSL 980 if (conn->ssl != NULL) 981 rlen = fetch_ssl_read(conn->ssl, buf, len); 982 else 983#endif 984 rlen = fetch_socket_read(conn->sd, buf, len); 985 if (rlen >= 0) { 986 break; 987 } else if (rlen == FETCH_READ_ERROR) { 988 fetch_syserr(); 989 return (-1); 990 } 991 // assert(rlen == FETCH_READ_WAIT); 992 if (fetchTimeout > 0) { 993 gettimeofday(&now, NULL); 994 if (!timercmp(&timeout, &now, >)) { 995 errno = ETIMEDOUT; 996 fetch_syserr(); 997 return (-1); 998 } 999 timersub(&timeout, &now, &delta); 1000 deltams = delta.tv_sec * 1000 + 1001 delta.tv_usec / 1000;; 1002 } 1003 errno = 0; 1004 pfd.revents = 0; 1005 if (poll(&pfd, 1, deltams) < 0) { 1006 if (errno == EINTR && fetchRestartCalls) 1007 continue; 1008 fetch_syserr(); 1009 return (-1); 1010 } 1011 } 1012 return (rlen); 1013} 1014 1015 1016/* 1017 * Read a line of text from a connection w/ timeout 1018 */ 1019#define MIN_BUF_SIZE 1024 1020 1021int 1022fetch_getln(conn_t *conn) 1023{ 1024 char *tmp; 1025 size_t tmpsize; 1026 ssize_t len; 1027 char c; 1028 1029 if (conn->buf == NULL) { 1030 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 1031 errno = ENOMEM; 1032 return (-1); 1033 } 1034 conn->bufsize = MIN_BUF_SIZE; 1035 } 1036 1037 conn->buf[0] = '\0'; 1038 conn->buflen = 0; 1039 1040 do { 1041 len = fetch_read(conn, &c, 1); 1042 if (len == -1) 1043 return (-1); 1044 if (len == 0) 1045 break; 1046 conn->buf[conn->buflen++] = c; 1047 if (conn->buflen == conn->bufsize) { 1048 tmp = conn->buf; 1049 tmpsize = conn->bufsize * 2 + 1; 1050 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 1051 errno = ENOMEM; 1052 return (-1); 1053 } 1054 conn->buf = tmp; 1055 conn->bufsize = tmpsize; 1056 } 1057 } while (c != '\n'); 1058 1059 conn->buf[conn->buflen] = '\0'; 1060 DEBUG(fprintf(stderr, "<<< %s", conn->buf)); 1061 return (0); 1062} 1063 1064 1065/* 1066 * Write to a connection w/ timeout 1067 */ 1068ssize_t 1069fetch_write(conn_t *conn, const char *buf, size_t len) 1070{ 1071 struct iovec iov; 1072 1073 iov.iov_base = __DECONST(char *, buf); 1074 iov.iov_len = len; 1075 return fetch_writev(conn, &iov, 1); 1076} 1077 1078/* 1079 * Write a vector to a connection w/ timeout 1080 * Note: can modify the iovec. 1081 */ 1082ssize_t 1083fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1084{ 1085 struct timeval now, timeout, delta; 1086 struct pollfd pfd; 1087 ssize_t wlen, total; 1088 int deltams; 1089 1090 memset(&pfd, 0, sizeof pfd); 1091 if (fetchTimeout) { 1092 pfd.fd = conn->sd; 1093 pfd.events = POLLOUT | POLLERR; 1094 gettimeofday(&timeout, NULL); 1095 timeout.tv_sec += fetchTimeout; 1096 } 1097 1098 total = 0; 1099 while (iovcnt > 0) { 1100 while (fetchTimeout && pfd.revents == 0) { 1101 gettimeofday(&now, NULL); 1102 if (!timercmp(&timeout, &now, >)) { 1103 errno = ETIMEDOUT; 1104 fetch_syserr(); 1105 return (-1); 1106 } 1107 timersub(&timeout, &now, &delta); 1108 deltams = delta.tv_sec * 1000 + 1109 delta.tv_usec / 1000; 1110 errno = 0; 1111 pfd.revents = 0; 1112 if (poll(&pfd, 1, deltams) < 0) { 1113 /* POSIX compliance */ 1114 if (errno == EAGAIN) 1115 continue; 1116 if (errno == EINTR && fetchRestartCalls) 1117 continue; 1118 return (-1); 1119 } 1120 } 1121 errno = 0; 1122#ifdef WITH_SSL 1123 if (conn->ssl != NULL) 1124 wlen = SSL_write(conn->ssl, 1125 iov->iov_base, iov->iov_len); 1126 else 1127#endif 1128 wlen = writev(conn->sd, iov, iovcnt); 1129 if (wlen == 0) { 1130 /* we consider a short write a failure */ 1131 /* XXX perhaps we shouldn't in the SSL case */ 1132 errno = EPIPE; 1133 fetch_syserr(); 1134 return (-1); 1135 } 1136 if (wlen < 0) { 1137 if (errno == EINTR && fetchRestartCalls) 1138 continue; 1139 return (-1); 1140 } 1141 total += wlen; 1142 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1143 wlen -= iov->iov_len; 1144 iov++; 1145 iovcnt--; 1146 } 1147 if (iovcnt > 0) { 1148 iov->iov_len -= wlen; 1149 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1150 } 1151 } 1152 return (total); 1153} 1154 1155 1156/* 1157 * Write a line of text to a connection w/ timeout 1158 */ 1159int 1160fetch_putln(conn_t *conn, const char *str, size_t len) 1161{ 1162 struct iovec iov[2]; 1163 int ret; 1164 1165 DEBUG(fprintf(stderr, ">>> %s\n", str)); 1166 iov[0].iov_base = __DECONST(char *, str); 1167 iov[0].iov_len = len; 1168 iov[1].iov_base = __DECONST(char *, ENDL); 1169 iov[1].iov_len = sizeof(ENDL); 1170 if (len == 0) 1171 ret = fetch_writev(conn, &iov[1], 1); 1172 else 1173 ret = fetch_writev(conn, iov, 2); 1174 if (ret == -1) 1175 return (-1); 1176 return (0); 1177} 1178 1179 1180/* 1181 * Close connection 1182 */ 1183int 1184fetch_close(conn_t *conn) 1185{ 1186 int ret; 1187 1188 if (--conn->ref > 0) 1189 return (0); 1190#ifdef WITH_SSL 1191 if (conn->ssl) { 1192 SSL_shutdown(conn->ssl); 1193 SSL_set_connect_state(conn->ssl); 1194 SSL_free(conn->ssl); 1195 conn->ssl = NULL; 1196 } 1197 if (conn->ssl_ctx) { 1198 SSL_CTX_free(conn->ssl_ctx); 1199 conn->ssl_ctx = NULL; 1200 } 1201 if (conn->ssl_cert) { 1202 X509_free(conn->ssl_cert); 1203 conn->ssl_cert = NULL; 1204 } 1205#endif 1206 ret = close(conn->sd); 1207 free(conn->buf); 1208 free(conn); 1209 return (ret); 1210} 1211 1212 1213/*** Directory-related utility functions *************************************/ 1214 1215int 1216fetch_add_entry(struct url_ent **p, int *size, int *len, 1217 const char *name, struct url_stat *us) 1218{ 1219 struct url_ent *tmp; 1220 1221 if (*p == NULL) { 1222 *size = 0; 1223 *len = 0; 1224 } 1225 1226 if (*len >= *size - 1) { 1227 tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p)); 1228 if (tmp == NULL) { 1229 errno = ENOMEM; 1230 fetch_syserr(); 1231 return (-1); 1232 } 1233 *size = (*size * 2 + 1); 1234 *p = tmp; 1235 } 1236 1237 tmp = *p + *len; 1238 snprintf(tmp->name, PATH_MAX, "%s", name); 1239 memcpy(&tmp->stat, us, sizeof(*us)); 1240 1241 (*len)++; 1242 (++tmp)->name[0] = 0; 1243 1244 return (0); 1245} 1246 1247 1248/*** Authentication-related utility functions ********************************/ 1249 1250static const char * 1251fetch_read_word(FILE *f) 1252{ 1253 static char word[1024]; 1254 1255 if (fscanf(f, " %1023s ", word) != 1) 1256 return (NULL); 1257 return (word); 1258} 1259 1260/* 1261 * Get authentication data for a URL from .netrc 1262 */ 1263int 1264fetch_netrc_auth(struct url *url) 1265{ 1266 char fn[PATH_MAX]; 1267 const char *word; 1268 char *p; 1269 FILE *f; 1270 1271 if ((p = getenv("NETRC")) != NULL) { 1272 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1273 fetch_info("$NETRC specifies a file name " 1274 "longer than PATH_MAX"); 1275 return (-1); 1276 } 1277 } else { 1278 if ((p = getenv("HOME")) != NULL) { 1279 struct passwd *pwd; 1280 1281 if ((pwd = getpwuid(getuid())) == NULL || 1282 (p = pwd->pw_dir) == NULL) 1283 return (-1); 1284 } 1285 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1286 return (-1); 1287 } 1288 1289 if ((f = fopen(fn, "r")) == NULL) 1290 return (-1); 1291 while ((word = fetch_read_word(f)) != NULL) { 1292 if (strcmp(word, "default") == 0) { 1293 DEBUG(fetch_info("Using default .netrc settings")); 1294 break; 1295 } 1296 if (strcmp(word, "machine") == 0 && 1297 (word = fetch_read_word(f)) != NULL && 1298 strcasecmp(word, url->host) == 0) { 1299 DEBUG(fetch_info("Using .netrc settings for %s", word)); 1300 break; 1301 } 1302 } 1303 if (word == NULL) 1304 goto ferr; 1305 while ((word = fetch_read_word(f)) != NULL) { 1306 if (strcmp(word, "login") == 0) { 1307 if ((word = fetch_read_word(f)) == NULL) 1308 goto ferr; 1309 if (snprintf(url->user, sizeof(url->user), 1310 "%s", word) > (int)sizeof(url->user)) { 1311 fetch_info("login name in .netrc is too long"); 1312 url->user[0] = '\0'; 1313 } 1314 } else if (strcmp(word, "password") == 0) { 1315 if ((word = fetch_read_word(f)) == NULL) 1316 goto ferr; 1317 if (snprintf(url->pwd, sizeof(url->pwd), 1318 "%s", word) > (int)sizeof(url->pwd)) { 1319 fetch_info("password in .netrc is too long"); 1320 url->pwd[0] = '\0'; 1321 } 1322 } else if (strcmp(word, "account") == 0) { 1323 if ((word = fetch_read_word(f)) == NULL) 1324 goto ferr; 1325 /* XXX not supported! */ 1326 } else { 1327 break; 1328 } 1329 } 1330 fclose(f); 1331 return (0); 1332 ferr: 1333 fclose(f); 1334 return (-1); 1335} 1336 1337/* 1338 * The no_proxy environment variable specifies a set of domains for 1339 * which the proxy should not be consulted; the contents is a comma-, 1340 * or space-separated list of domain names. A single asterisk will 1341 * override all proxy variables and no transactions will be proxied 1342 * (for compatability with lynx and curl, see the discussion at 1343 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1344 */ 1345int 1346fetch_no_proxy_match(const char *host) 1347{ 1348 const char *no_proxy, *p, *q; 1349 size_t h_len, d_len; 1350 1351 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1352 (no_proxy = getenv("no_proxy")) == NULL) 1353 return (0); 1354 1355 /* asterisk matches any hostname */ 1356 if (strcmp(no_proxy, "*") == 0) 1357 return (1); 1358 1359 h_len = strlen(host); 1360 p = no_proxy; 1361 do { 1362 /* position p at the beginning of a domain suffix */ 1363 while (*p == ',' || isspace((unsigned char)*p)) 1364 p++; 1365 1366 /* position q at the first separator character */ 1367 for (q = p; *q; ++q) 1368 if (*q == ',' || isspace((unsigned char)*q)) 1369 break; 1370 1371 d_len = q - p; 1372 if (d_len > 0 && h_len >= d_len && 1373 strncasecmp(host + h_len - d_len, 1374 p, d_len) == 0) { 1375 /* domain name matches */ 1376 return (1); 1377 } 1378 1379 p = q + 1; 1380 } while (*q); 1381 1382 return (0); 1383} 1384