1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1998-2016 Dag-Erling Smørgrav 5 * Copyright (c) 2013 Michael Gmelin <[email protected]> 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 <inttypes.h> 46 #include <netdb.h> 47 #include <poll.h> 48 #include <pwd.h> 49 #include <stdarg.h> 50 #include <stdlib.h> 51 #include <stdio.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #ifdef WITH_SSL 56 #include <openssl/x509v3.h> 57 #endif 58 59 #include "fetch.h" 60 #include "common.h" 61 62 63 /*** Local data **************************************************************/ 64 65 /* 66 * Error messages for resolver errors 67 */ 68 static struct fetcherr netdb_errlist[] = { 69 #ifdef EAI_NODATA 70 { EAI_NODATA, FETCH_RESOLV, "Host not found" }, 71 #endif 72 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 73 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 74 { EAI_NONAME, FETCH_RESOLV, "No address record" }, 75 { -1, FETCH_UNKNOWN, "Unknown resolver error" } 76 }; 77 78 /* 79 * SOCKS5 error enumerations 80 */ 81 enum SOCKS5_ERR { 82 /* Protocol errors */ 83 SOCKS5_ERR_SELECTION, 84 SOCKS5_ERR_READ_METHOD, 85 SOCKS5_ERR_VER5_ONLY, 86 SOCKS5_ERR_NOMETHODS, 87 SOCKS5_ERR_NOTIMPLEMENTED, 88 SOCKS5_ERR_HOSTNAME_SIZE, 89 SOCKS5_ERR_REQUEST, 90 SOCKS5_ERR_REPLY, 91 SOCKS5_ERR_NON_VER5_RESP, 92 SOCKS5_ERR_GENERAL, 93 SOCKS5_ERR_NOT_ALLOWED, 94 SOCKS5_ERR_NET_UNREACHABLE, 95 SOCKS5_ERR_HOST_UNREACHABLE, 96 SOCKS5_ERR_CONN_REFUSED, 97 SOCKS5_ERR_TTL_EXPIRED, 98 SOCKS5_ERR_COM_UNSUPPORTED, 99 SOCKS5_ERR_ADDR_UNSUPPORTED, 100 SOCKS5_ERR_UNSPECIFIED, 101 /* Configuration errors */ 102 SOCKS5_ERR_BAD_HOST, 103 SOCKS5_ERR_BAD_PROXY_FORMAT, 104 SOCKS5_ERR_BAD_PORT 105 }; 106 107 /* 108 * Error messages for SOCKS5 errors 109 */ 110 static struct fetcherr socks5_errlist[] = { 111 /* SOCKS5 protocol errors */ 112 { SOCKS5_ERR_SELECTION, FETCH_ABORT, "SOCKS5: Failed to send selection method" }, 113 { SOCKS5_ERR_READ_METHOD, FETCH_ABORT, "SOCKS5: Failed to read method" }, 114 { SOCKS5_ERR_VER5_ONLY, FETCH_PROTO, "SOCKS5: Only version 5 is implemented" }, 115 { SOCKS5_ERR_NOMETHODS, FETCH_PROTO, "SOCKS5: No acceptable methods" }, 116 { SOCKS5_ERR_NOTIMPLEMENTED, FETCH_PROTO, "SOCKS5: Method currently not implemented" }, 117 { SOCKS5_ERR_HOSTNAME_SIZE, FETCH_PROTO, "SOCKS5: Hostname size is above 256 bytes" }, 118 { SOCKS5_ERR_REQUEST, FETCH_PROTO, "SOCKS5: Failed to request" }, 119 { SOCKS5_ERR_REPLY, FETCH_PROTO, "SOCKS5: Failed to receive reply" }, 120 { SOCKS5_ERR_NON_VER5_RESP, FETCH_PROTO, "SOCKS5: Server responded with a non-version 5 response" }, 121 { SOCKS5_ERR_GENERAL, FETCH_ABORT, "SOCKS5: General server failure" }, 122 { SOCKS5_ERR_NOT_ALLOWED, FETCH_AUTH, "SOCKS5: Connection not allowed by ruleset" }, 123 { SOCKS5_ERR_NET_UNREACHABLE, FETCH_NETWORK, "SOCKS5: Network unreachable" }, 124 { SOCKS5_ERR_HOST_UNREACHABLE, FETCH_ABORT, "SOCKS5: Host unreachable" }, 125 { SOCKS5_ERR_CONN_REFUSED, FETCH_ABORT, "SOCKS5: Connection refused" }, 126 { SOCKS5_ERR_TTL_EXPIRED, FETCH_TIMEOUT, "SOCKS5: TTL expired" }, 127 { SOCKS5_ERR_COM_UNSUPPORTED, FETCH_PROTO, "SOCKS5: Command not supported" }, 128 { SOCKS5_ERR_ADDR_UNSUPPORTED, FETCH_ABORT, "SOCKS5: Address type not supported" }, 129 { SOCKS5_ERR_UNSPECIFIED, FETCH_UNKNOWN, "SOCKS5: Unspecified error" }, 130 /* Configuration error */ 131 { SOCKS5_ERR_BAD_HOST, FETCH_ABORT, "SOCKS5: Bad proxy host" }, 132 { SOCKS5_ERR_BAD_PROXY_FORMAT, FETCH_ABORT, "SOCKS5: Bad proxy format" }, 133 { SOCKS5_ERR_BAD_PORT, FETCH_ABORT, "SOCKS5: Bad port" } 134 }; 135 136 /* End-of-Line */ 137 static const char ENDL[2] = "\r\n"; 138 139 140 /*** Error-reporting functions ***********************************************/ 141 142 /* 143 * Map error code to string 144 */ 145 static struct fetcherr * 146 fetch_finderr(struct fetcherr *p, int e) 147 { 148 while (p->num != -1 && p->num != e) 149 p++; 150 return (p); 151 } 152 153 /* 154 * Set error code 155 */ 156 void 157 fetch_seterr(struct fetcherr *p, int e) 158 { 159 p = fetch_finderr(p, e); 160 fetchLastErrCode = p->cat; 161 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 162 } 163 164 /* 165 * Set error code according to errno 166 */ 167 void 168 fetch_syserr(void) 169 { 170 switch (errno) { 171 case 0: 172 fetchLastErrCode = FETCH_OK; 173 break; 174 case EPERM: 175 case EACCES: 176 case EROFS: 177 case EAUTH: 178 case ENEEDAUTH: 179 fetchLastErrCode = FETCH_AUTH; 180 break; 181 case ENOENT: 182 case EISDIR: /* XXX */ 183 fetchLastErrCode = FETCH_UNAVAIL; 184 break; 185 case ENOMEM: 186 fetchLastErrCode = FETCH_MEMORY; 187 break; 188 case EBUSY: 189 case EAGAIN: 190 fetchLastErrCode = FETCH_TEMP; 191 break; 192 case EEXIST: 193 fetchLastErrCode = FETCH_EXISTS; 194 break; 195 case ENOSPC: 196 fetchLastErrCode = FETCH_FULL; 197 break; 198 case EADDRINUSE: 199 case EADDRNOTAVAIL: 200 case ENETDOWN: 201 case ENETUNREACH: 202 case ENETRESET: 203 case EHOSTUNREACH: 204 fetchLastErrCode = FETCH_NETWORK; 205 break; 206 case ECONNABORTED: 207 case ECONNRESET: 208 fetchLastErrCode = FETCH_ABORT; 209 break; 210 case ETIMEDOUT: 211 fetchLastErrCode = FETCH_TIMEOUT; 212 break; 213 case ECONNREFUSED: 214 case EHOSTDOWN: 215 fetchLastErrCode = FETCH_DOWN; 216 break; 217 default: 218 fetchLastErrCode = FETCH_UNKNOWN; 219 } 220 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); 221 } 222 223 224 /* 225 * Emit status message 226 */ 227 void 228 fetch_info(const char *fmt, ...) 229 { 230 va_list ap; 231 232 va_start(ap, fmt); 233 vfprintf(stderr, fmt, ap); 234 va_end(ap); 235 fputc('\n', stderr); 236 } 237 238 239 /*** Network-related utility functions ***************************************/ 240 241 /* 242 * Return the default port for a scheme 243 */ 244 int 245 fetch_default_port(const char *scheme) 246 { 247 struct servent *se; 248 249 if ((se = getservbyname(scheme, "tcp")) != NULL) 250 return (ntohs(se->s_port)); 251 if (strcmp(scheme, SCHEME_FTP) == 0) 252 return (FTP_DEFAULT_PORT); 253 if (strcmp(scheme, SCHEME_HTTP) == 0) 254 return (HTTP_DEFAULT_PORT); 255 return (0); 256 } 257 258 /* 259 * Return the default proxy port for a scheme 260 */ 261 int 262 fetch_default_proxy_port(const char *scheme) 263 { 264 if (strcmp(scheme, SCHEME_FTP) == 0) 265 return (FTP_DEFAULT_PROXY_PORT); 266 if (strcmp(scheme, SCHEME_HTTP) == 0) 267 return (HTTP_DEFAULT_PROXY_PORT); 268 return (0); 269 } 270 271 272 /* 273 * Create a connection for an existing descriptor. 274 */ 275 conn_t * 276 fetch_reopen(int sd) 277 { 278 conn_t *conn; 279 int opt = 1; 280 281 /* allocate and fill connection structure */ 282 if ((conn = calloc(1, sizeof(*conn))) == NULL) 283 return (NULL); 284 fcntl(sd, F_SETFD, FD_CLOEXEC); 285 setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof opt); 286 conn->sd = sd; 287 ++conn->ref; 288 return (conn); 289 } 290 291 292 /* 293 * Bump a connection's reference count. 294 */ 295 conn_t * 296 fetch_ref(conn_t *conn) 297 { 298 299 ++conn->ref; 300 return (conn); 301 } 302 303 304 /* 305 * Resolve an address 306 */ 307 struct addrinfo * 308 fetch_resolve(const char *addr, int port, int af) 309 { 310 char hbuf[256], sbuf[8]; 311 struct addrinfo hints, *res; 312 const char *hb, *he, *sep; 313 const char *host, *service; 314 int err, len; 315 316 /* first, check for a bracketed IPv6 address */ 317 if (*addr == '[') { 318 hb = addr + 1; 319 if ((sep = strchr(hb, ']')) == NULL) { 320 errno = EINVAL; 321 goto syserr; 322 } 323 he = sep++; 324 } else { 325 hb = addr; 326 sep = strchrnul(hb, ':'); 327 he = sep; 328 } 329 330 /* see if we need to copy the host name */ 331 if (*he != '\0') { 332 len = snprintf(hbuf, sizeof(hbuf), 333 "%.*s", (int)(he - hb), hb); 334 if (len < 0) 335 goto syserr; 336 if (len >= (int)sizeof(hbuf)) { 337 errno = ENAMETOOLONG; 338 goto syserr; 339 } 340 host = hbuf; 341 } else { 342 host = hb; 343 } 344 345 /* was it followed by a service name? */ 346 if (*sep == '\0' && port != 0) { 347 if (port < 1 || port > 65535) { 348 errno = EINVAL; 349 goto syserr; 350 } 351 if (snprintf(sbuf, sizeof(sbuf), "%d", port) < 0) 352 goto syserr; 353 service = sbuf; 354 } else if (*sep != '\0') { 355 service = sep + 1; 356 } else { 357 service = NULL; 358 } 359 360 /* resolve */ 361 memset(&hints, 0, sizeof(hints)); 362 hints.ai_family = af; 363 hints.ai_socktype = SOCK_STREAM; 364 hints.ai_flags = AI_ADDRCONFIG; 365 if ((err = getaddrinfo(host, service, &hints, &res)) != 0) { 366 netdb_seterr(err); 367 return (NULL); 368 } 369 return (res); 370 syserr: 371 fetch_syserr(); 372 return (NULL); 373 } 374 375 376 /* 377 * Bind a socket to a specific local address 378 */ 379 int 380 fetch_bind(int sd, int af, const char *addr) 381 { 382 struct addrinfo *cliai, *ai; 383 int err; 384 385 if ((cliai = fetch_resolve(addr, 0, af)) == NULL) 386 return (-1); 387 for (ai = cliai; ai != NULL; ai = ai->ai_next) 388 if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0) 389 break; 390 if (err != 0) 391 fetch_syserr(); 392 freeaddrinfo(cliai); 393 return (err == 0 ? 0 : -1); 394 } 395 396 397 /* 398 * SOCKS5 connection initiation, based on RFC 1928 399 * Default DNS resolution over SOCKS5 400 */ 401 int 402 fetch_socks5_init(conn_t *conn, const char *host, int port, int verbose) 403 { 404 /* 405 * Size is based on largest packet prefix (4 bytes) + 406 * Largest FQDN (256) + one byte size (1) + 407 * Port (2) 408 */ 409 unsigned char buf[BUFF_SIZE]; 410 unsigned char *ptr; 411 int ret = 1; 412 413 if (verbose) 414 fetch_info("Initializing SOCKS5 connection: %s:%d", host, port); 415 416 /* Connection initialization */ 417 ptr = buf; 418 *ptr++ = SOCKS_VERSION_5; 419 *ptr++ = SOCKS_CONNECTION; 420 *ptr++ = SOCKS_RSV; 421 422 if (fetch_write(conn, buf, 3) != 3) { 423 ret = SOCKS5_ERR_SELECTION; 424 goto fail; 425 } 426 427 /* Verify response from SOCKS5 server */ 428 if (fetch_read(conn, buf, 2) != 2) { 429 ret = SOCKS5_ERR_READ_METHOD; 430 goto fail; 431 } 432 433 ptr = buf; 434 if (ptr[0] != SOCKS_VERSION_5) { 435 ret = SOCKS5_ERR_VER5_ONLY; 436 goto fail; 437 } 438 if (ptr[1] == SOCKS_NOMETHODS) { 439 ret = SOCKS5_ERR_NOMETHODS; 440 goto fail; 441 } 442 else if (ptr[1] != SOCKS5_NOTIMPLEMENTED) { 443 ret = SOCKS5_ERR_NOTIMPLEMENTED; 444 goto fail; 445 } 446 447 /* Send Request */ 448 *ptr++ = SOCKS_VERSION_5; 449 *ptr++ = SOCKS_CONNECTION; 450 *ptr++ = SOCKS_RSV; 451 /* Encode all targets as a hostname to avoid DNS leaks */ 452 *ptr++ = SOCKS_ATYP_DOMAINNAME; 453 if (strlen(host) > FQDN_SIZE) { 454 ret = SOCKS5_ERR_HOSTNAME_SIZE; 455 goto fail; 456 } 457 *ptr++ = strlen(host); 458 strncpy(ptr, host, strlen(host)); 459 ptr = ptr + strlen(host); 460 461 port = htons(port); 462 *ptr++ = port & 0x00ff; 463 *ptr++ = (port & 0xff00) >> 8; 464 465 if (fetch_write(conn, buf, ptr - buf) != ptr - buf) { 466 ret = SOCKS5_ERR_REQUEST; 467 goto fail; 468 } 469 470 /* BND.ADDR is variable length, read the largest on non-blocking socket */ 471 if (!fetch_read(conn, buf, BUFF_SIZE)) { 472 ret = SOCKS5_ERR_REPLY; 473 goto fail; 474 } 475 476 ptr = buf; 477 if (*ptr++ != SOCKS_VERSION_5) { 478 ret = SOCKS5_ERR_NON_VER5_RESP; 479 goto fail; 480 } 481 482 switch(*ptr++) { 483 case SOCKS_SUCCESS: 484 break; 485 case SOCKS_GENERAL_FAILURE: 486 ret = SOCKS5_ERR_GENERAL; 487 goto fail; 488 case SOCKS_CONNECTION_NOT_ALLOWED: 489 ret = SOCKS5_ERR_NOT_ALLOWED; 490 goto fail; 491 case SOCKS_NETWORK_UNREACHABLE: 492 ret = SOCKS5_ERR_NET_UNREACHABLE; 493 goto fail; 494 case SOCKS_HOST_UNREACHABLE: 495 ret = SOCKS5_ERR_HOST_UNREACHABLE; 496 goto fail; 497 case SOCKS_CONNECTION_REFUSED: 498 ret = SOCKS5_ERR_CONN_REFUSED; 499 goto fail; 500 case SOCKS_TTL_EXPIRED: 501 ret = SOCKS5_ERR_TTL_EXPIRED; 502 goto fail; 503 case SOCKS_COMMAND_NOT_SUPPORTED: 504 ret = SOCKS5_ERR_COM_UNSUPPORTED; 505 goto fail; 506 case SOCKS_ADDRESS_NOT_SUPPORTED: 507 ret = SOCKS5_ERR_ADDR_UNSUPPORTED; 508 goto fail; 509 default: 510 ret = SOCKS5_ERR_UNSPECIFIED; 511 goto fail; 512 } 513 514 return (ret); 515 516 fail: 517 socks5_seterr(ret); 518 return (0); 519 } 520 521 /* 522 * Perform SOCKS5 initialization 523 */ 524 int 525 fetch_socks5_getenv(char **host, int *port) 526 { 527 char *socks5env, *endptr, *ext; 528 529 if ((socks5env = getenv("SOCKS5_PROXY")) == NULL || *socks5env == '\0') { 530 *host = NULL; 531 *port = -1; 532 return (-1); 533 } 534 535 /* IPv6 addresses begin and end in brackets */ 536 if (socks5env[0] == '[') { 537 if (socks5env[strlen(socks5env) - 1] == ']') { 538 *host = strndup(socks5env, strlen(socks5env)); 539 if (*host == NULL) 540 goto fail; 541 *port = 1080; /* Default port as defined in RFC1928 */ 542 } else { 543 ext = strstr(socks5env, "]:"); 544 if (ext == NULL) { 545 socks5_seterr(SOCKS5_ERR_BAD_PROXY_FORMAT); 546 return (0); 547 } 548 ext=ext+1; 549 *host = strndup(socks5env, ext - socks5env); 550 if (*host == NULL) 551 goto fail; 552 errno = 0; 553 *port = strtoimax(ext + 1, (char **)&endptr, 10); 554 if (*endptr != '\0' || errno != 0 || *port < 0 || 555 *port > 65535) { 556 socks5_seterr(SOCKS5_ERR_BAD_PORT); 557 return (0); 558 } 559 } 560 } else { 561 ext = strrchr(socks5env, ':'); 562 if (ext == NULL) { 563 *host = strdup(socks5env); 564 *port = 1080; 565 } else { 566 *host = strndup(socks5env, ext-socks5env); 567 if (*host == NULL) 568 goto fail; 569 errno = 0; 570 *port = strtoimax(ext + 1, (char **)&endptr, 10); 571 if (*endptr != '\0' || errno != 0 || *port < 0 || 572 *port > 65535) { 573 socks5_seterr(SOCKS5_ERR_BAD_PORT); 574 return (0); 575 } 576 } 577 } 578 579 return (2); 580 581 fail: 582 fprintf(stderr, "Failure to allocate memory, exiting.\n"); 583 return (-1); 584 } 585 586 587 /* 588 * Establish a TCP connection to the specified port on the specified host. 589 */ 590 conn_t * 591 fetch_connect(const char *host, int port, int af, int verbose) 592 { 593 struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai; 594 const char *bindaddr; 595 conn_t *conn = NULL; 596 int err = 0, sd = -1; 597 char *sockshost; 598 int socksport; 599 600 DEBUGF("---> %s:%d\n", host, port); 601 602 /* Check if SOCKS5_PROXY env variable is set */ 603 if (!fetch_socks5_getenv(&sockshost, &socksport)) 604 goto fail; 605 606 /* Not using SOCKS5 proxy */ 607 if (sockshost == NULL) { 608 /* resolve server address */ 609 if (verbose) 610 fetch_info("resolving server address: %s:%d", host, 611 port); 612 if ((sais = fetch_resolve(host, port, af)) == NULL) 613 goto fail; 614 615 /* resolve client address */ 616 bindaddr = getenv("FETCH_BIND_ADDRESS"); 617 if (bindaddr != NULL && *bindaddr != '\0') { 618 if (verbose) 619 fetch_info("resolving client address: %s", 620 bindaddr); 621 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL) 622 goto fail; 623 } 624 } else { 625 /* resolve socks5 proxy address */ 626 if (verbose) 627 fetch_info("resolving SOCKS5 server address: %s:%d", 628 sockshost, socksport); 629 if ((sais = fetch_resolve(sockshost, socksport, af)) == NULL) { 630 socks5_seterr(SOCKS5_ERR_BAD_HOST); 631 goto fail; 632 } 633 } 634 635 /* try each server address in turn */ 636 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) { 637 /* open socket */ 638 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0) 639 goto syserr; 640 /* attempt to bind to client address */ 641 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) { 642 if (cai->ai_family != sai->ai_family) 643 continue; 644 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0) 645 break; 646 } 647 if (err != 0) { 648 if (verbose) 649 fetch_info("failed to bind to %s", bindaddr); 650 goto syserr; 651 } 652 /* attempt to connect to server address */ 653 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0) 654 break; 655 /* clean up before next attempt */ 656 close(sd); 657 sd = -1; 658 } 659 if (err != 0) { 660 if (verbose && sockshost == NULL) { 661 fetch_info("failed to connect to %s:%d", host, port); 662 goto syserr; 663 } else if (sockshost != NULL) { 664 if (verbose) 665 fetch_info( 666 "failed to connect to SOCKS5 server %s:%d", 667 sockshost, socksport); 668 socks5_seterr(SOCKS5_ERR_CONN_REFUSED); 669 goto syserr1; 670 } 671 goto syserr; 672 } 673 674 if ((conn = fetch_reopen(sd)) == NULL) 675 goto syserr; 676 677 if (sockshost) 678 if (!fetch_socks5_init(conn, host, port, verbose)) 679 goto fail; 680 if (cais != NULL) 681 freeaddrinfo(cais); 682 if (sais != NULL) 683 freeaddrinfo(sais); 684 return (conn); 685 syserr: 686 fetch_syserr(); 687 syserr1: 688 goto fail; 689 fail: 690 if (sd >= 0) 691 close(sd); 692 if (cais != NULL) 693 freeaddrinfo(cais); 694 if (sais != NULL) 695 freeaddrinfo(sais); 696 return (NULL); 697 } 698 699 #ifdef WITH_SSL 700 /* 701 * Convert characters A-Z to lowercase (intentionally avoid any locale 702 * specific conversions). 703 */ 704 static char 705 fetch_ssl_tolower(char in) 706 { 707 if (in >= 'A' && in <= 'Z') 708 return (in + 32); 709 else 710 return (in); 711 } 712 713 /* 714 * isalpha implementation that intentionally avoids any locale specific 715 * conversions. 716 */ 717 static int 718 fetch_ssl_isalpha(char in) 719 { 720 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 721 } 722 723 /* 724 * Check if passed hostnames a and b are equal. 725 */ 726 static int 727 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 728 size_t blen) 729 { 730 size_t i; 731 732 if (alen != blen) 733 return (0); 734 for (i = 0; i < alen; ++i) { 735 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 736 return (0); 737 } 738 return (1); 739 } 740 741 /* 742 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 743 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 744 * numeric characters. Double hyphens (like they're found in IDN a-labels 745 * 'xn--') are not allowed. Empty labels are invalid. 746 */ 747 static int 748 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 749 { 750 size_t i; 751 752 if (!len || l[0] == '-' || l[len-1] == '-') 753 return (0); 754 for (i = 0; i < len; ++i) { 755 if (!isdigit(l[i]) && 756 !fetch_ssl_isalpha(l[i]) && 757 !(l[i] == '*' && wcok) && 758 !(l[i] == '-' && l[i - 1] != '-')) 759 return (0); 760 } 761 return (1); 762 } 763 764 /* 765 * Check if host name consists only of numbers. This might indicate an IP 766 * address, which is not a good idea for CN wildcard comparison. 767 */ 768 static int 769 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 770 { 771 size_t i; 772 773 for (i = 0; i < len; ++i) { 774 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 775 hostname[i] == '.')) 776 return (0); 777 } 778 return (1); 779 } 780 781 /* 782 * Check if the host name h passed matches the pattern passed in m which 783 * is usually part of subjectAltName or CN of a certificate presented to 784 * the client. This includes wildcard matching. The algorithm is based on 785 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 786 */ 787 static int 788 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 789 size_t mlen) 790 { 791 int delta, hdotidx, mdot1idx, wcidx; 792 const char *hdot, *mdot1, *mdot2; 793 const char *wc; /* wildcard */ 794 795 if (!(h && *h && m && *m)) 796 return (0); 797 if ((wc = strnstr(m, "*", mlen)) == NULL) 798 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 799 wcidx = wc - m; 800 /* hostname should not be just dots and numbers */ 801 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 802 return (0); 803 /* only one wildcard allowed in pattern */ 804 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 805 return (0); 806 /* 807 * there must be at least two more domain labels and 808 * wildcard has to be in the leftmost label (RFC6125) 809 */ 810 mdot1 = strnstr(m, ".", mlen); 811 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 812 return (0); 813 mdot1idx = mdot1 - m; 814 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 815 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 816 return (0); 817 /* hostname must contain a dot and not be the 1st char */ 818 hdot = strnstr(h, ".", hlen); 819 if (hdot == NULL || hdot == h) 820 return (0); 821 hdotidx = hdot - h; 822 /* 823 * host part of hostname must be at least as long as 824 * pattern it's supposed to match 825 */ 826 if (hdotidx < mdot1idx) 827 return (0); 828 /* 829 * don't allow wildcards in non-traditional domain names 830 * (IDN, A-label, U-label...) 831 */ 832 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 833 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 834 return (0); 835 /* match domain part (part after first dot) */ 836 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 837 mlen - mdot1idx)) 838 return (0); 839 /* match part left of wildcard */ 840 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 841 return (0); 842 /* match part right of wildcard */ 843 delta = mdot1idx - wcidx - 1; 844 if (!fetch_ssl_hname_equal(hdot - delta, delta, 845 mdot1 - delta, delta)) 846 return (0); 847 /* all tests succeeded, it's a match */ 848 return (1); 849 } 850 851 /* 852 * Get numeric host address info - returns NULL if host was not an IP 853 * address. The caller is responsible for deallocation using 854 * freeaddrinfo(3). 855 */ 856 static struct addrinfo * 857 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 858 { 859 struct addrinfo hints, *res; 860 char *host; 861 862 host = (char *)malloc(len + 1); 863 memcpy(host, hostname, len); 864 host[len] = '\0'; 865 memset(&hints, 0, sizeof(hints)); 866 hints.ai_family = PF_UNSPEC; 867 hints.ai_socktype = SOCK_STREAM; 868 hints.ai_protocol = 0; 869 hints.ai_flags = AI_NUMERICHOST; 870 /* port is not relevant for this purpose */ 871 if (getaddrinfo(host, "443", &hints, &res) != 0) 872 res = NULL; 873 free(host); 874 return res; 875 } 876 877 /* 878 * Compare ip address in addrinfo with address passes. 879 */ 880 static int 881 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 882 size_t rhostlen) 883 { 884 const void *left; 885 886 if (lhost->ai_family == AF_INET && rhostlen == 4) { 887 left = (void *)&((struct sockaddr_in*)(void *) 888 lhost->ai_addr)->sin_addr.s_addr; 889 #ifdef INET6 890 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 891 left = (void *)&((struct sockaddr_in6 *)(void *) 892 lhost->ai_addr)->sin6_addr; 893 #endif 894 } else 895 return (0); 896 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 897 } 898 899 /* 900 * Compare ip address in addrinfo with host passed. If host is not an IP 901 * address, comparison will fail. 902 */ 903 static int 904 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 905 size_t rlen) 906 { 907 struct addrinfo *raddr; 908 int ret; 909 char *rip; 910 911 ret = 0; 912 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 913 return 0; /* not a numeric host */ 914 915 if (laddr->ai_family == raddr->ai_family) { 916 if (laddr->ai_family == AF_INET) { 917 rip = (char *)&((struct sockaddr_in *)(void *) 918 raddr->ai_addr)->sin_addr.s_addr; 919 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 920 #ifdef INET6 921 } else if (laddr->ai_family == AF_INET6) { 922 rip = (char *)&((struct sockaddr_in6 *)(void *) 923 raddr->ai_addr)->sin6_addr; 924 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 925 #endif 926 } 927 928 } 929 freeaddrinfo(raddr); 930 return (ret); 931 } 932 933 /* 934 * Verify server certificate by subjectAltName. 935 */ 936 static int 937 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 938 const char *host, struct addrinfo *ip) 939 { 940 const GENERAL_NAME *name; 941 size_t nslen; 942 int i; 943 const char *ns; 944 945 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 946 #if OPENSSL_VERSION_NUMBER < 0x10000000L 947 /* 948 * This is a workaround, since the following line causes 949 * alignment issues in clang: 950 * name = sk_GENERAL_NAME_value(altnames, i); 951 * OpenSSL explicitly warns not to use those macros 952 * directly, but there isn't much choice (and there 953 * shouldn't be any ill side effects) 954 */ 955 name = (GENERAL_NAME *)SKM_sk_value(void, altnames, i); 956 #else 957 name = sk_GENERAL_NAME_value(altnames, i); 958 #endif 959 #if OPENSSL_VERSION_NUMBER < 0x10100000L 960 ns = (const char *)ASN1_STRING_data(name->d.ia5); 961 #else 962 ns = (const char *)ASN1_STRING_get0_data(name->d.ia5); 963 #endif 964 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 965 966 if (name->type == GEN_DNS && ip == NULL && 967 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 968 return (1); 969 else if (name->type == GEN_IPADD && ip != NULL && 970 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 971 return (1); 972 } 973 return (0); 974 } 975 976 /* 977 * Verify server certificate by CN. 978 */ 979 static int 980 fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 981 struct addrinfo *ip) 982 { 983 ASN1_STRING *namedata; 984 X509_NAME_ENTRY *nameentry; 985 int cnlen, lastpos, loc, ret; 986 unsigned char *cn; 987 988 ret = 0; 989 lastpos = -1; 990 loc = -1; 991 cn = NULL; 992 /* get most specific CN (last entry in list) and compare */ 993 while ((lastpos = X509_NAME_get_index_by_NID(subject, 994 NID_commonName, lastpos)) != -1) 995 loc = lastpos; 996 997 if (loc > -1) { 998 nameentry = X509_NAME_get_entry(subject, loc); 999 namedata = X509_NAME_ENTRY_get_data(nameentry); 1000 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 1001 if (ip == NULL && 1002 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 1003 ret = 1; 1004 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 1005 ret = 1; 1006 OPENSSL_free(cn); 1007 } 1008 return (ret); 1009 } 1010 1011 /* 1012 * Verify that server certificate subjectAltName/CN matches 1013 * hostname. First check, if there are alternative subject names. If yes, 1014 * those have to match. Only if those don't exist it falls back to 1015 * checking the subject's CN. 1016 */ 1017 static int 1018 fetch_ssl_verify_hname(X509 *cert, const char *host) 1019 { 1020 struct addrinfo *ip; 1021 STACK_OF(GENERAL_NAME) *altnames; 1022 X509_NAME *subject; 1023 int ret; 1024 1025 ret = 0; 1026 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 1027 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 1028 NULL, NULL); 1029 1030 if (altnames != NULL) { 1031 ret = fetch_ssl_verify_altname(altnames, host, ip); 1032 } else { 1033 subject = X509_get_subject_name(cert); 1034 if (subject != NULL) 1035 ret = fetch_ssl_verify_cn(subject, host, ip); 1036 } 1037 1038 if (ip != NULL) 1039 freeaddrinfo(ip); 1040 if (altnames != NULL) 1041 GENERAL_NAMES_free(altnames); 1042 return (ret); 1043 } 1044 1045 /* 1046 * Configure transport security layer based on environment. 1047 */ 1048 static void 1049 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 1050 { 1051 long ssl_ctx_options; 1052 1053 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET; 1054 if (getenv("SSL_ALLOW_SSL3") == NULL) 1055 ssl_ctx_options |= SSL_OP_NO_SSLv3; 1056 if (getenv("SSL_NO_TLS1") != NULL) 1057 ssl_ctx_options |= SSL_OP_NO_TLSv1; 1058 if (getenv("SSL_NO_TLS1_1") != NULL) 1059 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 1060 if (getenv("SSL_NO_TLS1_2") != NULL) 1061 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 1062 if (verbose) 1063 fetch_info("SSL options: %lx", ssl_ctx_options); 1064 SSL_CTX_set_options(ctx, ssl_ctx_options); 1065 } 1066 1067 1068 /* 1069 * Configure peer verification based on environment. 1070 */ 1071 #define LOCAL_CERT_FILE "/usr/local/etc/ssl/cert.pem" 1072 #define BASE_CERT_FILE "/etc/ssl/cert.pem" 1073 static int 1074 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 1075 { 1076 X509_LOOKUP *crl_lookup; 1077 X509_STORE *crl_store; 1078 const char *ca_cert_file, *ca_cert_path, *crl_file; 1079 1080 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 1081 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 1082 if (ca_cert_file == NULL && 1083 access(LOCAL_CERT_FILE, R_OK) == 0) 1084 ca_cert_file = LOCAL_CERT_FILE; 1085 if (ca_cert_file == NULL && 1086 access(BASE_CERT_FILE, R_OK) == 0) 1087 ca_cert_file = BASE_CERT_FILE; 1088 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 1089 if (verbose) { 1090 fetch_info("Peer verification enabled"); 1091 if (ca_cert_file != NULL) 1092 fetch_info("Using CA cert file: %s", 1093 ca_cert_file); 1094 if (ca_cert_path != NULL) 1095 fetch_info("Using CA cert path: %s", 1096 ca_cert_path); 1097 if (ca_cert_file == NULL && ca_cert_path == NULL) 1098 fetch_info("Using OpenSSL default " 1099 "CA cert file and path"); 1100 } 1101 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 1102 fetch_ssl_cb_verify_crt); 1103 if (ca_cert_file != NULL || ca_cert_path != NULL) 1104 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 1105 ca_cert_path); 1106 else 1107 SSL_CTX_set_default_verify_paths(ctx); 1108 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 1109 if (verbose) 1110 fetch_info("Using CRL file: %s", crl_file); 1111 crl_store = SSL_CTX_get_cert_store(ctx); 1112 crl_lookup = X509_STORE_add_lookup(crl_store, 1113 X509_LOOKUP_file()); 1114 if (crl_lookup == NULL || 1115 !X509_load_crl_file(crl_lookup, crl_file, 1116 X509_FILETYPE_PEM)) { 1117 fprintf(stderr, 1118 "Could not load CRL file %s\n", 1119 crl_file); 1120 return (0); 1121 } 1122 X509_STORE_set_flags(crl_store, 1123 X509_V_FLAG_CRL_CHECK | 1124 X509_V_FLAG_CRL_CHECK_ALL); 1125 } 1126 } 1127 return (1); 1128 } 1129 1130 /* 1131 * Configure client certificate based on environment. 1132 */ 1133 static int 1134 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 1135 { 1136 const char *client_cert_file, *client_key_file; 1137 1138 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 1139 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 1140 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 1141 if (verbose) { 1142 fetch_info("Using client cert file: %s", 1143 client_cert_file); 1144 fetch_info("Using client key file: %s", 1145 client_key_file); 1146 } 1147 if (SSL_CTX_use_certificate_chain_file(ctx, 1148 client_cert_file) != 1) { 1149 fprintf(stderr, 1150 "Could not load client certificate %s\n", 1151 client_cert_file); 1152 return (0); 1153 } 1154 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 1155 SSL_FILETYPE_PEM) != 1) { 1156 fprintf(stderr, 1157 "Could not load client key %s\n", 1158 client_key_file); 1159 return (0); 1160 } 1161 } 1162 return (1); 1163 } 1164 1165 /* 1166 * Callback for SSL certificate verification, this is called on server 1167 * cert verification. It takes no decision, but informs the user in case 1168 * verification failed. 1169 */ 1170 int 1171 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 1172 { 1173 X509 *crt; 1174 X509_NAME *name; 1175 char *str; 1176 1177 str = NULL; 1178 if (!verified) { 1179 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 1180 (name = X509_get_subject_name(crt)) != NULL) 1181 str = X509_NAME_oneline(name, 0, 0); 1182 fprintf(stderr, "Certificate verification failed for %s\n", 1183 str != NULL ? str : "no relevant certificate"); 1184 OPENSSL_free(str); 1185 } 1186 return (verified); 1187 } 1188 1189 #endif 1190 1191 /* 1192 * Enable SSL on a connection. 1193 */ 1194 int 1195 fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 1196 { 1197 #ifdef WITH_SSL 1198 int ret, ssl_err; 1199 X509_NAME *name; 1200 char *str; 1201 1202 /* Init the SSL library and context */ 1203 if (!SSL_library_init()){ 1204 fprintf(stderr, "SSL library init failed\n"); 1205 return (-1); 1206 } 1207 1208 SSL_load_error_strings(); 1209 1210 conn->ssl_meth = SSLv23_client_method(); 1211 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 1212 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 1213 1214 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 1215 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 1216 return (-1); 1217 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 1218 return (-1); 1219 1220 conn->ssl = SSL_new(conn->ssl_ctx); 1221 if (conn->ssl == NULL) { 1222 fprintf(stderr, "SSL context creation failed\n"); 1223 return (-1); 1224 } 1225 SSL_set_fd(conn->ssl, conn->sd); 1226 1227 #if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT) 1228 if (!SSL_set_tlsext_host_name(conn->ssl, 1229 __DECONST(struct url *, URL)->host)) { 1230 fprintf(stderr, 1231 "TLS server name indication extension failed for host %s\n", 1232 URL->host); 1233 return (-1); 1234 } 1235 #endif 1236 while ((ret = SSL_connect(conn->ssl)) == -1) { 1237 ssl_err = SSL_get_error(conn->ssl, ret); 1238 if (ssl_err != SSL_ERROR_WANT_READ && 1239 ssl_err != SSL_ERROR_WANT_WRITE) { 1240 ERR_print_errors_fp(stderr); 1241 return (-1); 1242 } 1243 } 1244 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 1245 1246 if (conn->ssl_cert == NULL) { 1247 fprintf(stderr, "No server SSL certificate\n"); 1248 return (-1); 1249 } 1250 1251 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 1252 if (verbose) 1253 fetch_info("Verify hostname"); 1254 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 1255 fprintf(stderr, 1256 "SSL certificate subject doesn't match host %s\n", 1257 URL->host); 1258 return (-1); 1259 } 1260 } 1261 1262 if (verbose) { 1263 fetch_info("%s connection established using %s", 1264 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 1265 name = X509_get_subject_name(conn->ssl_cert); 1266 str = X509_NAME_oneline(name, 0, 0); 1267 fetch_info("Certificate subject: %s", str); 1268 OPENSSL_free(str); 1269 name = X509_get_issuer_name(conn->ssl_cert); 1270 str = X509_NAME_oneline(name, 0, 0); 1271 fetch_info("Certificate issuer: %s", str); 1272 OPENSSL_free(str); 1273 } 1274 1275 return (0); 1276 #else 1277 (void)conn; 1278 (void)verbose; 1279 (void)URL; 1280 fprintf(stderr, "SSL support disabled\n"); 1281 return (-1); 1282 #endif 1283 } 1284 1285 #define FETCH_READ_WAIT -2 1286 #define FETCH_READ_ERROR -1 1287 #define FETCH_READ_DONE 0 1288 1289 #ifdef WITH_SSL 1290 static ssize_t 1291 fetch_ssl_read(SSL *ssl, char *buf, size_t len) 1292 { 1293 ssize_t rlen; 1294 int ssl_err; 1295 1296 rlen = SSL_read(ssl, buf, len); 1297 if (rlen < 0) { 1298 ssl_err = SSL_get_error(ssl, rlen); 1299 if (ssl_err == SSL_ERROR_WANT_READ || 1300 ssl_err == SSL_ERROR_WANT_WRITE) { 1301 return (FETCH_READ_WAIT); 1302 } else { 1303 ERR_print_errors_fp(stderr); 1304 return (FETCH_READ_ERROR); 1305 } 1306 } 1307 return (rlen); 1308 } 1309 #endif 1310 1311 static ssize_t 1312 fetch_socket_read(int sd, char *buf, size_t len) 1313 { 1314 ssize_t rlen; 1315 1316 rlen = read(sd, buf, len); 1317 if (rlen < 0) { 1318 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 1319 return (FETCH_READ_WAIT); 1320 else 1321 return (FETCH_READ_ERROR); 1322 } 1323 return (rlen); 1324 } 1325 1326 /* 1327 * Read a character from a connection w/ timeout 1328 */ 1329 ssize_t 1330 fetch_read(conn_t *conn, char *buf, size_t len) 1331 { 1332 struct timeval now, timeout, delta; 1333 struct pollfd pfd; 1334 ssize_t rlen; 1335 int deltams; 1336 1337 if (fetchTimeout > 0) { 1338 gettimeofday(&timeout, NULL); 1339 timeout.tv_sec += fetchTimeout; 1340 } 1341 1342 deltams = INFTIM; 1343 memset(&pfd, 0, sizeof pfd); 1344 pfd.fd = conn->sd; 1345 pfd.events = POLLIN | POLLERR; 1346 1347 for (;;) { 1348 /* 1349 * The socket is non-blocking. Instead of the canonical 1350 * poll() -> read(), we do the following: 1351 * 1352 * 1) call read() or SSL_read(). 1353 * 2) if we received some data, return it. 1354 * 3) if an error occurred, return -1. 1355 * 4) if read() or SSL_read() signaled EOF, return. 1356 * 5) if we did not receive any data but we're not at EOF, 1357 * call poll(). 1358 * 1359 * In the SSL case, this is necessary because if we 1360 * receive a close notification, we have to call 1361 * SSL_read() one additional time after we've read 1362 * everything we received. 1363 * 1364 * In the non-SSL case, it may improve performance (very 1365 * slightly) when reading small amounts of data. 1366 */ 1367 #ifdef WITH_SSL 1368 if (conn->ssl != NULL) 1369 rlen = fetch_ssl_read(conn->ssl, buf, len); 1370 else 1371 #endif 1372 rlen = fetch_socket_read(conn->sd, buf, len); 1373 if (rlen >= 0) { 1374 break; 1375 } else if (rlen == FETCH_READ_ERROR) { 1376 fetch_syserr(); 1377 return (-1); 1378 } 1379 // assert(rlen == FETCH_READ_WAIT); 1380 if (fetchTimeout > 0) { 1381 gettimeofday(&now, NULL); 1382 if (!timercmp(&timeout, &now, >)) { 1383 errno = ETIMEDOUT; 1384 fetch_syserr(); 1385 return (-1); 1386 } 1387 timersub(&timeout, &now, &delta); 1388 deltams = delta.tv_sec * 1000 + 1389 delta.tv_usec / 1000;; 1390 } 1391 errno = 0; 1392 pfd.revents = 0; 1393 if (poll(&pfd, 1, deltams) < 0) { 1394 if (errno == EINTR && fetchRestartCalls) 1395 continue; 1396 fetch_syserr(); 1397 return (-1); 1398 } 1399 } 1400 return (rlen); 1401 } 1402 1403 1404 /* 1405 * Read a line of text from a connection w/ timeout 1406 */ 1407 #define MIN_BUF_SIZE 1024 1408 1409 int 1410 fetch_getln(conn_t *conn) 1411 { 1412 char *tmp; 1413 size_t tmpsize; 1414 ssize_t len; 1415 char c; 1416 1417 if (conn->buf == NULL) { 1418 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 1419 errno = ENOMEM; 1420 return (-1); 1421 } 1422 conn->bufsize = MIN_BUF_SIZE; 1423 } 1424 1425 conn->buf[0] = '\0'; 1426 conn->buflen = 0; 1427 1428 do { 1429 len = fetch_read(conn, &c, 1); 1430 if (len == -1) 1431 return (-1); 1432 if (len == 0) 1433 break; 1434 conn->buf[conn->buflen++] = c; 1435 if (conn->buflen == conn->bufsize) { 1436 tmp = conn->buf; 1437 tmpsize = conn->bufsize * 2 + 1; 1438 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 1439 errno = ENOMEM; 1440 return (-1); 1441 } 1442 conn->buf = tmp; 1443 conn->bufsize = tmpsize; 1444 } 1445 } while (c != '\n'); 1446 1447 conn->buf[conn->buflen] = '\0'; 1448 DEBUGF("<<< %s", conn->buf); 1449 return (0); 1450 } 1451 1452 1453 /* 1454 * Write to a connection w/ timeout 1455 */ 1456 ssize_t 1457 fetch_write(conn_t *conn, const char *buf, size_t len) 1458 { 1459 struct iovec iov; 1460 1461 iov.iov_base = __DECONST(char *, buf); 1462 iov.iov_len = len; 1463 return fetch_writev(conn, &iov, 1); 1464 } 1465 1466 /* 1467 * Write a vector to a connection w/ timeout 1468 * Note: can modify the iovec. 1469 */ 1470 ssize_t 1471 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1472 { 1473 struct timeval now, timeout, delta; 1474 struct pollfd pfd; 1475 ssize_t wlen, total; 1476 int deltams; 1477 1478 memset(&pfd, 0, sizeof pfd); 1479 if (fetchTimeout) { 1480 pfd.fd = conn->sd; 1481 pfd.events = POLLOUT | POLLERR; 1482 gettimeofday(&timeout, NULL); 1483 timeout.tv_sec += fetchTimeout; 1484 } 1485 1486 total = 0; 1487 while (iovcnt > 0) { 1488 while (fetchTimeout && pfd.revents == 0) { 1489 gettimeofday(&now, NULL); 1490 if (!timercmp(&timeout, &now, >)) { 1491 errno = ETIMEDOUT; 1492 fetch_syserr(); 1493 return (-1); 1494 } 1495 timersub(&timeout, &now, &delta); 1496 deltams = delta.tv_sec * 1000 + 1497 delta.tv_usec / 1000; 1498 errno = 0; 1499 pfd.revents = 0; 1500 if (poll(&pfd, 1, deltams) < 0) { 1501 /* POSIX compliance */ 1502 if (errno == EAGAIN) 1503 continue; 1504 if (errno == EINTR && fetchRestartCalls) 1505 continue; 1506 return (-1); 1507 } 1508 } 1509 errno = 0; 1510 #ifdef WITH_SSL 1511 if (conn->ssl != NULL) 1512 wlen = SSL_write(conn->ssl, 1513 iov->iov_base, iov->iov_len); 1514 else 1515 #endif 1516 wlen = writev(conn->sd, iov, iovcnt); 1517 if (wlen == 0) { 1518 /* we consider a short write a failure */ 1519 /* XXX perhaps we shouldn't in the SSL case */ 1520 errno = EPIPE; 1521 fetch_syserr(); 1522 return (-1); 1523 } 1524 if (wlen < 0) { 1525 if (errno == EINTR && fetchRestartCalls) 1526 continue; 1527 return (-1); 1528 } 1529 total += wlen; 1530 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1531 wlen -= iov->iov_len; 1532 iov++; 1533 iovcnt--; 1534 } 1535 if (iovcnt > 0) { 1536 iov->iov_len -= wlen; 1537 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1538 } 1539 } 1540 return (total); 1541 } 1542 1543 1544 /* 1545 * Write a line of text to a connection w/ timeout 1546 */ 1547 int 1548 fetch_putln(conn_t *conn, const char *str, size_t len) 1549 { 1550 struct iovec iov[2]; 1551 int ret; 1552 1553 DEBUGF(">>> %s\n", str); 1554 iov[0].iov_base = __DECONST(char *, str); 1555 iov[0].iov_len = len; 1556 iov[1].iov_base = __DECONST(char *, ENDL); 1557 iov[1].iov_len = sizeof(ENDL); 1558 if (len == 0) 1559 ret = fetch_writev(conn, &iov[1], 1); 1560 else 1561 ret = fetch_writev(conn, iov, 2); 1562 if (ret == -1) 1563 return (-1); 1564 return (0); 1565 } 1566 1567 1568 /* 1569 * Close connection 1570 */ 1571 int 1572 fetch_close(conn_t *conn) 1573 { 1574 int ret; 1575 1576 if (--conn->ref > 0) 1577 return (0); 1578 #ifdef WITH_SSL 1579 if (conn->ssl) { 1580 SSL_shutdown(conn->ssl); 1581 SSL_set_connect_state(conn->ssl); 1582 SSL_free(conn->ssl); 1583 conn->ssl = NULL; 1584 } 1585 if (conn->ssl_ctx) { 1586 SSL_CTX_free(conn->ssl_ctx); 1587 conn->ssl_ctx = NULL; 1588 } 1589 if (conn->ssl_cert) { 1590 X509_free(conn->ssl_cert); 1591 conn->ssl_cert = NULL; 1592 } 1593 #endif 1594 ret = close(conn->sd); 1595 free(conn->buf); 1596 free(conn); 1597 return (ret); 1598 } 1599 1600 1601 /*** Directory-related utility functions *************************************/ 1602 1603 int 1604 fetch_add_entry(struct url_ent **p, int *size, int *len, 1605 const char *name, struct url_stat *us) 1606 { 1607 struct url_ent *tmp; 1608 1609 if (*p == NULL) { 1610 *size = 0; 1611 *len = 0; 1612 } 1613 1614 if (*len >= *size - 1) { 1615 tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p)); 1616 if (tmp == NULL) { 1617 errno = ENOMEM; 1618 fetch_syserr(); 1619 return (-1); 1620 } 1621 *size = (*size * 2 + 1); 1622 *p = tmp; 1623 } 1624 1625 tmp = *p + *len; 1626 snprintf(tmp->name, PATH_MAX, "%s", name); 1627 memcpy(&tmp->stat, us, sizeof(*us)); 1628 1629 (*len)++; 1630 (++tmp)->name[0] = 0; 1631 1632 return (0); 1633 } 1634 1635 1636 /*** Authentication-related utility functions ********************************/ 1637 1638 static const char * 1639 fetch_read_word(FILE *f) 1640 { 1641 static char word[1024]; 1642 1643 if (fscanf(f, " %1023s ", word) != 1) 1644 return (NULL); 1645 return (word); 1646 } 1647 1648 static int 1649 fetch_netrc_open(void) 1650 { 1651 struct passwd *pwd; 1652 char fn[PATH_MAX]; 1653 const char *p; 1654 int fd, serrno; 1655 1656 if ((p = getenv("NETRC")) != NULL) { 1657 DEBUGF("NETRC=%s\n", p); 1658 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1659 fetch_info("$NETRC specifies a file name " 1660 "longer than PATH_MAX"); 1661 return (-1); 1662 } 1663 } else { 1664 if ((p = getenv("HOME")) == NULL) { 1665 if ((pwd = getpwuid(getuid())) == NULL || 1666 (p = pwd->pw_dir) == NULL) 1667 return (-1); 1668 } 1669 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1670 return (-1); 1671 } 1672 1673 if ((fd = open(fn, O_RDONLY)) < 0) { 1674 serrno = errno; 1675 DEBUGF("%s: %s\n", fn, strerror(serrno)); 1676 errno = serrno; 1677 } 1678 return (fd); 1679 } 1680 1681 /* 1682 * Get authentication data for a URL from .netrc 1683 */ 1684 int 1685 fetch_netrc_auth(struct url *url) 1686 { 1687 const char *word; 1688 int serrno; 1689 FILE *f; 1690 1691 if (url->netrcfd < 0) 1692 url->netrcfd = fetch_netrc_open(); 1693 if (url->netrcfd < 0) 1694 return (-1); 1695 if ((f = fdopen(url->netrcfd, "r")) == NULL) { 1696 serrno = errno; 1697 DEBUGF("fdopen(netrcfd): %s", strerror(errno)); 1698 close(url->netrcfd); 1699 url->netrcfd = -1; 1700 errno = serrno; 1701 return (-1); 1702 } 1703 rewind(f); 1704 DEBUGF("searching netrc for %s\n", url->host); 1705 while ((word = fetch_read_word(f)) != NULL) { 1706 if (strcmp(word, "default") == 0) { 1707 DEBUGF("using default netrc settings\n"); 1708 break; 1709 } 1710 if (strcmp(word, "machine") == 0 && 1711 (word = fetch_read_word(f)) != NULL && 1712 strcasecmp(word, url->host) == 0) { 1713 DEBUGF("using netrc settings for %s\n", word); 1714 break; 1715 } 1716 } 1717 if (word == NULL) 1718 goto ferr; 1719 while ((word = fetch_read_word(f)) != NULL) { 1720 if (strcmp(word, "login") == 0) { 1721 if ((word = fetch_read_word(f)) == NULL) 1722 goto ferr; 1723 if (snprintf(url->user, sizeof(url->user), 1724 "%s", word) > (int)sizeof(url->user)) { 1725 fetch_info("login name in .netrc is too long"); 1726 url->user[0] = '\0'; 1727 } 1728 } else if (strcmp(word, "password") == 0) { 1729 if ((word = fetch_read_word(f)) == NULL) 1730 goto ferr; 1731 if (snprintf(url->pwd, sizeof(url->pwd), 1732 "%s", word) > (int)sizeof(url->pwd)) { 1733 fetch_info("password in .netrc is too long"); 1734 url->pwd[0] = '\0'; 1735 } 1736 } else if (strcmp(word, "account") == 0) { 1737 if ((word = fetch_read_word(f)) == NULL) 1738 goto ferr; 1739 /* XXX not supported! */ 1740 } else { 1741 break; 1742 } 1743 } 1744 fclose(f); 1745 url->netrcfd = -1; 1746 return (0); 1747 ferr: 1748 serrno = errno; 1749 fclose(f); 1750 url->netrcfd = -1; 1751 errno = serrno; 1752 return (-1); 1753 } 1754 1755 /* 1756 * The no_proxy environment variable specifies a set of domains for 1757 * which the proxy should not be consulted; the contents is a comma-, 1758 * or space-separated list of domain names. A single asterisk will 1759 * override all proxy variables and no transactions will be proxied 1760 * (for compatibility with lynx and curl, see the discussion at 1761 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1762 */ 1763 int 1764 fetch_no_proxy_match(const char *host) 1765 { 1766 const char *no_proxy, *p, *q; 1767 size_t h_len, d_len; 1768 1769 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1770 (no_proxy = getenv("no_proxy")) == NULL) 1771 return (0); 1772 1773 /* asterisk matches any hostname */ 1774 if (strcmp(no_proxy, "*") == 0) 1775 return (1); 1776 1777 h_len = strlen(host); 1778 p = no_proxy; 1779 do { 1780 /* position p at the beginning of a domain suffix */ 1781 while (*p == ',' || isspace((unsigned char)*p)) 1782 p++; 1783 1784 /* position q at the first separator character */ 1785 for (q = p; *q; ++q) 1786 if (*q == ',' || isspace((unsigned char)*q)) 1787 break; 1788 1789 d_len = q - p; 1790 if (d_len > 0 && h_len >= d_len && 1791 strncasecmp(host + h_len - d_len, 1792 p, d_len) == 0) { 1793 /* domain name matches */ 1794 return (1); 1795 } 1796 1797 p = q + 1; 1798 } while (*q); 1799 1800 return (0); 1801 } 1802