1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1998-2016 Dag-Erling Smørgrav 5 * Copyright (c) 2013 Michael Gmelin <freebsd@grem.de> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer 13 * in this position and unchanged. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #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 <inttypes.h> 44 #include <netdb.h> 45 #include <paths.h> 46 #include <poll.h> 47 #include <pwd.h> 48 #include <stdarg.h> 49 #include <stdlib.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #ifdef WITH_SSL 55 #include <openssl/x509v3.h> 56 #endif 57 58 #include "fetch.h" 59 #include "common.h" 60 61 62 /*** Local data **************************************************************/ 63 64 /* 65 * Error messages for resolver errors 66 */ 67 static struct fetcherr netdb_errlist[] = { 68 #ifdef EAI_ADDRFAMILY 69 { EAI_ADDRFAMILY, FETCH_RESOLV, "Address family for host not supported" }, 70 #endif 71 #ifdef EAI_NODATA 72 { EAI_NODATA, FETCH_RESOLV, "No address for host" }, 73 #endif 74 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 75 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 76 { EAI_NONAME, FETCH_RESOLV, "Host does not resolve" }, 77 { -1, FETCH_UNKNOWN, "Unknown resolver error" } 78 }; 79 80 /* 81 * SOCKS5 error enumerations 82 */ 83 enum SOCKS5_ERR { 84 /* Protocol errors */ 85 SOCKS5_ERR_SELECTION, 86 SOCKS5_ERR_READ_METHOD, 87 SOCKS5_ERR_VER5_ONLY, 88 SOCKS5_ERR_NOMETHODS, 89 SOCKS5_ERR_NOTIMPLEMENTED, 90 SOCKS5_ERR_HOSTNAME_SIZE, 91 SOCKS5_ERR_REQUEST, 92 SOCKS5_ERR_REPLY, 93 SOCKS5_ERR_NON_VER5_RESP, 94 SOCKS5_ERR_GENERAL, 95 SOCKS5_ERR_NOT_ALLOWED, 96 SOCKS5_ERR_NET_UNREACHABLE, 97 SOCKS5_ERR_HOST_UNREACHABLE, 98 SOCKS5_ERR_CONN_REFUSED, 99 SOCKS5_ERR_TTL_EXPIRED, 100 SOCKS5_ERR_COM_UNSUPPORTED, 101 SOCKS5_ERR_ADDR_UNSUPPORTED, 102 SOCKS5_ERR_UNSPECIFIED, 103 /* Configuration errors */ 104 SOCKS5_ERR_BAD_HOST, 105 SOCKS5_ERR_BAD_PROXY_FORMAT, 106 SOCKS5_ERR_BAD_PORT 107 }; 108 109 /* 110 * Error messages for SOCKS5 errors 111 */ 112 static struct fetcherr socks5_errlist[] = { 113 /* SOCKS5 protocol errors */ 114 { SOCKS5_ERR_SELECTION, FETCH_ABORT, "SOCKS5: Failed to send selection method" }, 115 { SOCKS5_ERR_READ_METHOD, FETCH_ABORT, "SOCKS5: Failed to read method" }, 116 { SOCKS5_ERR_VER5_ONLY, FETCH_PROTO, "SOCKS5: Only version 5 is implemented" }, 117 { SOCKS5_ERR_NOMETHODS, FETCH_PROTO, "SOCKS5: No acceptable methods" }, 118 { SOCKS5_ERR_NOTIMPLEMENTED, FETCH_PROTO, "SOCKS5: Method currently not implemented" }, 119 { SOCKS5_ERR_HOSTNAME_SIZE, FETCH_PROTO, "SOCKS5: Hostname size is above 256 bytes" }, 120 { SOCKS5_ERR_REQUEST, FETCH_PROTO, "SOCKS5: Failed to request" }, 121 { SOCKS5_ERR_REPLY, FETCH_PROTO, "SOCKS5: Failed to receive reply" }, 122 { SOCKS5_ERR_NON_VER5_RESP, FETCH_PROTO, "SOCKS5: Server responded with a non-version 5 response" }, 123 { SOCKS5_ERR_GENERAL, FETCH_ABORT, "SOCKS5: General server failure" }, 124 { SOCKS5_ERR_NOT_ALLOWED, FETCH_AUTH, "SOCKS5: Connection not allowed by ruleset" }, 125 { SOCKS5_ERR_NET_UNREACHABLE, FETCH_NETWORK, "SOCKS5: Network unreachable" }, 126 { SOCKS5_ERR_HOST_UNREACHABLE, FETCH_ABORT, "SOCKS5: Host unreachable" }, 127 { SOCKS5_ERR_CONN_REFUSED, FETCH_ABORT, "SOCKS5: Connection refused" }, 128 { SOCKS5_ERR_TTL_EXPIRED, FETCH_TIMEOUT, "SOCKS5: TTL expired" }, 129 { SOCKS5_ERR_COM_UNSUPPORTED, FETCH_PROTO, "SOCKS5: Command not supported" }, 130 { SOCKS5_ERR_ADDR_UNSUPPORTED, FETCH_ABORT, "SOCKS5: Address type not supported" }, 131 { SOCKS5_ERR_UNSPECIFIED, FETCH_UNKNOWN, "SOCKS5: Unspecified error" }, 132 /* Configuration error */ 133 { SOCKS5_ERR_BAD_HOST, FETCH_ABORT, "SOCKS5: Bad proxy host" }, 134 { SOCKS5_ERR_BAD_PROXY_FORMAT, FETCH_ABORT, "SOCKS5: Bad proxy format" }, 135 { SOCKS5_ERR_BAD_PORT, FETCH_ABORT, "SOCKS5: Bad port" } 136 }; 137 138 /* End-of-Line */ 139 static const char ENDL[2] = "\r\n"; 140 141 142 /*** Error-reporting functions ***********************************************/ 143 144 /* 145 * Map error code to string 146 */ 147 static struct fetcherr * 148 fetch_finderr(struct fetcherr *p, int e) 149 { 150 while (p->num != -1 && p->num != e) 151 p++; 152 return (p); 153 } 154 155 /* 156 * Set error code 157 */ 158 void 159 fetch_seterr(struct fetcherr *p, int e) 160 { 161 p = fetch_finderr(p, e); 162 fetchLastErrCode = p->cat; 163 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 164 } 165 166 /* 167 * Set error code according to errno 168 */ 169 void 170 fetch_syserr(void) 171 { 172 switch (errno) { 173 case 0: 174 fetchLastErrCode = FETCH_OK; 175 break; 176 case EPERM: 177 case EACCES: 178 case EROFS: 179 case EAUTH: 180 case ENEEDAUTH: 181 fetchLastErrCode = FETCH_AUTH; 182 break; 183 case ENOENT: 184 case EISDIR: /* XXX */ 185 fetchLastErrCode = FETCH_UNAVAIL; 186 break; 187 case ENOMEM: 188 fetchLastErrCode = FETCH_MEMORY; 189 break; 190 case EBUSY: 191 case EAGAIN: 192 fetchLastErrCode = FETCH_TEMP; 193 break; 194 case EEXIST: 195 fetchLastErrCode = FETCH_EXISTS; 196 break; 197 case ENOSPC: 198 fetchLastErrCode = FETCH_FULL; 199 break; 200 case EADDRINUSE: 201 case EADDRNOTAVAIL: 202 case ENETDOWN: 203 case ENETUNREACH: 204 case ENETRESET: 205 case EHOSTUNREACH: 206 fetchLastErrCode = FETCH_NETWORK; 207 break; 208 case ECONNABORTED: 209 case ECONNRESET: 210 fetchLastErrCode = FETCH_ABORT; 211 break; 212 case ETIMEDOUT: 213 fetchLastErrCode = FETCH_TIMEOUT; 214 break; 215 case ECONNREFUSED: 216 case EHOSTDOWN: 217 fetchLastErrCode = FETCH_DOWN; 218 break; 219 default: 220 fetchLastErrCode = FETCH_UNKNOWN; 221 } 222 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); 223 } 224 225 226 /* 227 * Emit status message 228 */ 229 void 230 fetch_info(const char *fmt, ...) 231 { 232 va_list ap; 233 234 va_start(ap, fmt); 235 vfprintf(stderr, fmt, ap); 236 va_end(ap); 237 fputc('\n', stderr); 238 } 239 240 241 /*** Network-related utility functions ***************************************/ 242 243 /* 244 * Return the default port for a scheme 245 */ 246 int 247 fetch_default_port(const char *scheme) 248 { 249 struct servent *se; 250 251 if ((se = getservbyname(scheme, "tcp")) != NULL) 252 return (ntohs(se->s_port)); 253 if (strcmp(scheme, SCHEME_FTP) == 0) 254 return (FTP_DEFAULT_PORT); 255 if (strcmp(scheme, SCHEME_HTTP) == 0) 256 return (HTTP_DEFAULT_PORT); 257 return (0); 258 } 259 260 /* 261 * Return the default proxy port for a scheme 262 */ 263 int 264 fetch_default_proxy_port(const char *scheme) 265 { 266 if (strcmp(scheme, SCHEME_FTP) == 0) 267 return (FTP_DEFAULT_PROXY_PORT); 268 if (strcmp(scheme, SCHEME_HTTP) == 0) 269 return (HTTP_DEFAULT_PROXY_PORT); 270 return (0); 271 } 272 273 274 /* 275 * Create a connection for an existing descriptor. 276 */ 277 conn_t * 278 fetch_reopen(int sd) 279 { 280 conn_t *conn; 281 int opt = 1; 282 283 /* allocate and fill connection structure */ 284 if ((conn = calloc(1, sizeof(*conn))) == NULL) 285 return (NULL); 286 fcntl(sd, F_SETFD, FD_CLOEXEC); 287 setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof opt); 288 conn->sd = sd; 289 ++conn->ref; 290 return (conn); 291 } 292 293 294 /* 295 * Bump a connection's reference count. 296 */ 297 conn_t * 298 fetch_ref(conn_t *conn) 299 { 300 301 ++conn->ref; 302 return (conn); 303 } 304 305 306 /* 307 * Resolve an address 308 */ 309 struct addrinfo * 310 fetch_resolve(const char *addr, int port, int af) 311 { 312 char hbuf[256], sbuf[8]; 313 struct addrinfo hints, *res; 314 const char *hb, *he, *sep; 315 const char *host, *service; 316 int err, len; 317 318 /* first, check for a bracketed IPv6 address */ 319 if (*addr == '[') { 320 hb = addr + 1; 321 if ((sep = strchr(hb, ']')) == NULL) { 322 errno = EINVAL; 323 goto syserr; 324 } 325 he = sep++; 326 } else { 327 hb = addr; 328 sep = strchrnul(hb, ':'); 329 he = sep; 330 } 331 332 /* see if we need to copy the host name */ 333 if (*he != '\0') { 334 len = snprintf(hbuf, sizeof(hbuf), 335 "%.*s", (int)(he - hb), hb); 336 if (len < 0) 337 goto syserr; 338 if (len >= (int)sizeof(hbuf)) { 339 errno = ENAMETOOLONG; 340 goto syserr; 341 } 342 host = hbuf; 343 } else { 344 host = hb; 345 } 346 347 /* was it followed by a service name? */ 348 if (*sep == '\0' && port != 0) { 349 if (port < 1 || port > 65535) { 350 errno = EINVAL; 351 goto syserr; 352 } 353 if (snprintf(sbuf, sizeof(sbuf), "%d", port) < 0) 354 goto syserr; 355 service = sbuf; 356 } else if (*sep != '\0') { 357 service = sep + 1; 358 } else { 359 service = NULL; 360 } 361 362 /* resolve */ 363 memset(&hints, 0, sizeof(hints)); 364 hints.ai_family = af; 365 hints.ai_socktype = SOCK_STREAM; 366 hints.ai_flags = AI_ADDRCONFIG; 367 if ((err = getaddrinfo(host, service, &hints, &res)) != 0) { 368 netdb_seterr(err); 369 return (NULL); 370 } 371 return (res); 372 syserr: 373 fetch_syserr(); 374 return (NULL); 375 } 376 377 378 /* 379 * Bind a socket to a specific local address 380 */ 381 int 382 fetch_bind(int sd, int af, const char *addr) 383 { 384 struct addrinfo *cliai, *ai; 385 int err; 386 387 if ((cliai = fetch_resolve(addr, 0, af)) == NULL) 388 return (-1); 389 for (ai = cliai; ai != NULL; ai = ai->ai_next) 390 if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0) 391 break; 392 if (err != 0) 393 fetch_syserr(); 394 freeaddrinfo(cliai); 395 return (err == 0 ? 0 : -1); 396 } 397 398 399 /* 400 * SOCKS5 connection initiation, based on RFC 1928 401 * Default DNS resolution over SOCKS5 402 */ 403 int 404 fetch_socks5_init(conn_t *conn, const char *host, int port, int verbose) 405 { 406 /* 407 * Size is based on largest packet prefix (4 bytes) + 408 * Largest FQDN (256) + one byte size (1) + 409 * Port (2) 410 */ 411 unsigned char buf[BUFF_SIZE]; 412 unsigned char *ptr; 413 int ret = 1; 414 415 if (verbose) 416 fetch_info("Initializing SOCKS5 connection: %s:%d", host, port); 417 418 /* Connection initialization */ 419 ptr = buf; 420 *ptr++ = SOCKS_VERSION_5; 421 *ptr++ = SOCKS_CONNECTION; 422 *ptr++ = SOCKS_RSV; 423 424 if (fetch_write(conn, buf, 3) != 3) { 425 ret = SOCKS5_ERR_SELECTION; 426 goto fail; 427 } 428 429 /* Verify response from SOCKS5 server */ 430 if (fetch_read(conn, buf, 2) != 2) { 431 ret = SOCKS5_ERR_READ_METHOD; 432 goto fail; 433 } 434 435 ptr = buf; 436 if (ptr[0] != SOCKS_VERSION_5) { 437 ret = SOCKS5_ERR_VER5_ONLY; 438 goto fail; 439 } 440 if (ptr[1] == SOCKS_NOMETHODS) { 441 ret = SOCKS5_ERR_NOMETHODS; 442 goto fail; 443 } 444 else if (ptr[1] != SOCKS5_NOTIMPLEMENTED) { 445 ret = SOCKS5_ERR_NOTIMPLEMENTED; 446 goto fail; 447 } 448 449 /* Send Request */ 450 *ptr++ = SOCKS_VERSION_5; 451 *ptr++ = SOCKS_CONNECTION; 452 *ptr++ = SOCKS_RSV; 453 /* Encode all targets as a hostname to avoid DNS leaks */ 454 *ptr++ = SOCKS_ATYP_DOMAINNAME; 455 if (strlen(host) > FQDN_SIZE) { 456 ret = SOCKS5_ERR_HOSTNAME_SIZE; 457 goto fail; 458 } 459 *ptr++ = strlen(host); 460 memcpy(ptr, host, strlen(host)); 461 ptr = ptr + strlen(host); 462 463 port = htons(port); 464 *ptr++ = port & 0x00ff; 465 *ptr++ = (port & 0xff00) >> 8; 466 467 if (fetch_write(conn, buf, ptr - buf) != ptr - buf) { 468 ret = SOCKS5_ERR_REQUEST; 469 goto fail; 470 } 471 472 /* BND.ADDR is variable length, read the largest on non-blocking socket */ 473 if (!fetch_read(conn, buf, BUFF_SIZE)) { 474 ret = SOCKS5_ERR_REPLY; 475 goto fail; 476 } 477 478 ptr = buf; 479 if (*ptr++ != SOCKS_VERSION_5) { 480 ret = SOCKS5_ERR_NON_VER5_RESP; 481 goto fail; 482 } 483 484 switch(*ptr++) { 485 case SOCKS_SUCCESS: 486 break; 487 case SOCKS_GENERAL_FAILURE: 488 ret = SOCKS5_ERR_GENERAL; 489 goto fail; 490 case SOCKS_CONNECTION_NOT_ALLOWED: 491 ret = SOCKS5_ERR_NOT_ALLOWED; 492 goto fail; 493 case SOCKS_NETWORK_UNREACHABLE: 494 ret = SOCKS5_ERR_NET_UNREACHABLE; 495 goto fail; 496 case SOCKS_HOST_UNREACHABLE: 497 ret = SOCKS5_ERR_HOST_UNREACHABLE; 498 goto fail; 499 case SOCKS_CONNECTION_REFUSED: 500 ret = SOCKS5_ERR_CONN_REFUSED; 501 goto fail; 502 case SOCKS_TTL_EXPIRED: 503 ret = SOCKS5_ERR_TTL_EXPIRED; 504 goto fail; 505 case SOCKS_COMMAND_NOT_SUPPORTED: 506 ret = SOCKS5_ERR_COM_UNSUPPORTED; 507 goto fail; 508 case SOCKS_ADDRESS_NOT_SUPPORTED: 509 ret = SOCKS5_ERR_ADDR_UNSUPPORTED; 510 goto fail; 511 default: 512 ret = SOCKS5_ERR_UNSPECIFIED; 513 goto fail; 514 } 515 516 return (ret); 517 518 fail: 519 socks5_seterr(ret); 520 return (0); 521 } 522 523 /* 524 * Perform SOCKS5 initialization 525 */ 526 int 527 fetch_socks5_getenv(char **host, int *port) 528 { 529 char *socks5env, *endptr, *ext; 530 const char *portDelim; 531 size_t slen; 532 533 portDelim = ":"; 534 if ((socks5env = getenv("SOCKS5_PROXY")) == NULL || *socks5env == '\0') { 535 *host = NULL; 536 *port = -1; 537 return (-1); 538 } 539 540 /* 541 * IPv6 addresses begin and end in brackets. Set the port delimiter 542 * accordingly and search for it so we can do appropriate validation. 543 */ 544 if (socks5env[0] == '[') 545 portDelim = "]:"; 546 547 slen = strlen(socks5env); 548 ext = strstr(socks5env, portDelim); 549 if (socks5env[0] == '[') { 550 if (socks5env[slen - 1] == ']') { 551 *host = strndup(socks5env, slen); 552 } else if (ext != NULL) { 553 *host = strndup(socks5env, ext - socks5env + 1); 554 } else { 555 socks5_seterr(SOCKS5_ERR_BAD_PROXY_FORMAT); 556 return (0); 557 } 558 } else { 559 *host = strndup(socks5env, ext - socks5env); 560 } 561 562 if (*host == NULL) { 563 fprintf(stderr, "Failure to allocate memory, exiting.\n"); 564 return (-1); 565 } 566 if (ext == NULL) { 567 *port = 1080; /* Default port as defined in RFC1928 */ 568 } else { 569 ext += strlen(portDelim); 570 errno = 0; 571 *port = strtoimax(ext, (char **)&endptr, 10); 572 if (*endptr != '\0' || errno != 0 || *port < 0 || 573 *port > 65535) { 574 free(*host); 575 *host = NULL; 576 socks5_seterr(SOCKS5_ERR_BAD_PORT); 577 return (0); 578 } 579 } 580 581 return (2); 582 } 583 584 585 /* 586 * Establish a TCP connection to the specified port on the specified host. 587 */ 588 conn_t * 589 fetch_connect(const char *host, int port, int af, int verbose) 590 { 591 struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai; 592 const char *bindaddr; 593 conn_t *conn = NULL; 594 int err = 0, sd = -1; 595 char *sockshost; 596 int socksport; 597 598 DEBUGF("---> %s:%d\n", host, port); 599 600 /* 601 * Check if SOCKS5_PROXY env variable is set. fetch_socks5_getenv 602 * will either set sockshost = NULL or allocate memory in all cases. 603 */ 604 sockshost = NULL; 605 if (!fetch_socks5_getenv(&sockshost, &socksport)) 606 goto fail; 607 608 /* Not using SOCKS5 proxy */ 609 if (sockshost == NULL) { 610 /* resolve server address */ 611 if (verbose) 612 fetch_info("resolving server address: %s:%d", host, 613 port); 614 if ((sais = fetch_resolve(host, port, af)) == NULL) 615 goto fail; 616 617 /* resolve client address */ 618 bindaddr = getenv("FETCH_BIND_ADDRESS"); 619 if (bindaddr != NULL && *bindaddr != '\0') { 620 if (verbose) 621 fetch_info("resolving client address: %s", 622 bindaddr); 623 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL) 624 goto fail; 625 } 626 } else { 627 /* resolve socks5 proxy address */ 628 if (verbose) 629 fetch_info("resolving SOCKS5 server address: %s:%d", 630 sockshost, socksport); 631 if ((sais = fetch_resolve(sockshost, socksport, af)) == NULL) { 632 socks5_seterr(SOCKS5_ERR_BAD_HOST); 633 goto fail; 634 } 635 } 636 637 /* try each server address in turn */ 638 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) { 639 /* open socket */ 640 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0) 641 goto syserr; 642 /* attempt to bind to client address */ 643 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) { 644 if (cai->ai_family != sai->ai_family) 645 continue; 646 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0) 647 break; 648 } 649 if (err != 0) { 650 if (verbose) 651 fetch_info("failed to bind to %s", bindaddr); 652 goto syserr; 653 } 654 /* attempt to connect to server address */ 655 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0) 656 break; 657 /* clean up before next attempt */ 658 close(sd); 659 sd = -1; 660 } 661 if (err != 0) { 662 if (verbose && sockshost == NULL) { 663 fetch_info("failed to connect to %s:%d", host, port); 664 goto syserr; 665 } else if (sockshost != NULL) { 666 if (verbose) 667 fetch_info( 668 "failed to connect to SOCKS5 server %s:%d", 669 sockshost, socksport); 670 socks5_seterr(SOCKS5_ERR_CONN_REFUSED); 671 goto fail; 672 } 673 goto syserr; 674 } 675 676 if ((conn = fetch_reopen(sd)) == NULL) 677 goto syserr; 678 679 if (sockshost) 680 if (!fetch_socks5_init(conn, host, port, verbose)) 681 goto fail; 682 free(sockshost); 683 if (cais != NULL) 684 freeaddrinfo(cais); 685 if (sais != NULL) 686 freeaddrinfo(sais); 687 return (conn); 688 syserr: 689 fetch_syserr(); 690 fail: 691 free(sockshost); 692 /* Fully close if it was opened; otherwise just don't leak the fd. */ 693 if (conn != NULL) 694 fetch_close(conn); 695 else if (sd >= 0) 696 close(sd); 697 if (cais != NULL) 698 freeaddrinfo(cais); 699 if (sais != NULL) 700 freeaddrinfo(sais); 701 return (NULL); 702 } 703 704 #ifdef WITH_SSL 705 /* 706 * Convert characters A-Z to lowercase (intentionally avoid any locale 707 * specific conversions). 708 */ 709 static char 710 fetch_ssl_tolower(char in) 711 { 712 if (in >= 'A' && in <= 'Z') 713 return (in + 32); 714 else 715 return (in); 716 } 717 718 /* 719 * isalpha implementation that intentionally avoids any locale specific 720 * conversions. 721 */ 722 static int 723 fetch_ssl_isalpha(char in) 724 { 725 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 726 } 727 728 /* 729 * Check if passed hostnames a and b are equal. 730 */ 731 static int 732 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 733 size_t blen) 734 { 735 size_t i; 736 737 if (alen != blen) 738 return (0); 739 for (i = 0; i < alen; ++i) { 740 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 741 return (0); 742 } 743 return (1); 744 } 745 746 /* 747 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 748 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 749 * numeric characters. Double hyphens (like they're found in IDN a-labels 750 * 'xn--') are not allowed. Empty labels are invalid. 751 */ 752 static int 753 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 754 { 755 size_t i; 756 757 if (!len || l[0] == '-' || l[len-1] == '-') 758 return (0); 759 for (i = 0; i < len; ++i) { 760 if (!isdigit(l[i]) && 761 !fetch_ssl_isalpha(l[i]) && 762 !(l[i] == '*' && wcok) && 763 !(l[i] == '-' && l[i - 1] != '-')) 764 return (0); 765 } 766 return (1); 767 } 768 769 /* 770 * Check if host name consists only of numbers. This might indicate an IP 771 * address, which is not a good idea for CN wildcard comparison. 772 */ 773 static int 774 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 775 { 776 size_t i; 777 778 for (i = 0; i < len; ++i) { 779 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 780 hostname[i] == '.')) 781 return (0); 782 } 783 return (1); 784 } 785 786 /* 787 * Check if the host name h passed matches the pattern passed in m which 788 * is usually part of subjectAltName or CN of a certificate presented to 789 * the client. This includes wildcard matching. The algorithm is based on 790 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 791 */ 792 static int 793 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 794 size_t mlen) 795 { 796 int delta, hdotidx, mdot1idx, wcidx; 797 const char *hdot, *mdot1, *mdot2; 798 const char *wc; /* wildcard */ 799 800 if (!(h && *h && m && *m)) 801 return (0); 802 if ((wc = strnstr(m, "*", mlen)) == NULL) 803 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 804 wcidx = wc - m; 805 /* hostname should not be just dots and numbers */ 806 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 807 return (0); 808 /* only one wildcard allowed in pattern */ 809 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 810 return (0); 811 /* 812 * there must be at least two more domain labels and 813 * wildcard has to be in the leftmost label (RFC6125) 814 */ 815 mdot1 = strnstr(m, ".", mlen); 816 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 817 return (0); 818 mdot1idx = mdot1 - m; 819 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 820 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 821 return (0); 822 /* hostname must contain a dot and not be the 1st char */ 823 hdot = strnstr(h, ".", hlen); 824 if (hdot == NULL || hdot == h) 825 return (0); 826 hdotidx = hdot - h; 827 /* 828 * host part of hostname must be at least as long as 829 * pattern it's supposed to match 830 */ 831 if (hdotidx < mdot1idx) 832 return (0); 833 /* 834 * don't allow wildcards in non-traditional domain names 835 * (IDN, A-label, U-label...) 836 */ 837 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 838 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 839 return (0); 840 /* match domain part (part after first dot) */ 841 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 842 mlen - mdot1idx)) 843 return (0); 844 /* match part left of wildcard */ 845 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 846 return (0); 847 /* match part right of wildcard */ 848 delta = mdot1idx - wcidx - 1; 849 if (!fetch_ssl_hname_equal(hdot - delta, delta, 850 mdot1 - delta, delta)) 851 return (0); 852 /* all tests succeeded, it's a match */ 853 return (1); 854 } 855 856 /* 857 * Get numeric host address info - returns NULL if host was not an IP 858 * address. The caller is responsible for deallocation using 859 * freeaddrinfo(3). 860 */ 861 static struct addrinfo * 862 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 863 { 864 struct addrinfo hints, *res; 865 char *host; 866 867 host = (char *)malloc(len + 1); 868 memcpy(host, hostname, len); 869 host[len] = '\0'; 870 memset(&hints, 0, sizeof(hints)); 871 hints.ai_family = PF_UNSPEC; 872 hints.ai_socktype = SOCK_STREAM; 873 hints.ai_protocol = 0; 874 hints.ai_flags = AI_NUMERICHOST; 875 /* port is not relevant for this purpose */ 876 if (getaddrinfo(host, "443", &hints, &res) != 0) 877 res = NULL; 878 free(host); 879 return res; 880 } 881 882 /* 883 * Compare ip address in addrinfo with address passes. 884 */ 885 static int 886 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 887 size_t rhostlen) 888 { 889 const void *left; 890 891 if (lhost->ai_family == AF_INET && rhostlen == 4) { 892 left = (void *)&((struct sockaddr_in*)(void *) 893 lhost->ai_addr)->sin_addr.s_addr; 894 #ifdef INET6 895 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 896 left = (void *)&((struct sockaddr_in6 *)(void *) 897 lhost->ai_addr)->sin6_addr; 898 #endif 899 } else 900 return (0); 901 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 902 } 903 904 /* 905 * Compare ip address in addrinfo with host passed. If host is not an IP 906 * address, comparison will fail. 907 */ 908 static int 909 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 910 size_t rlen) 911 { 912 struct addrinfo *raddr; 913 int ret; 914 char *rip; 915 916 ret = 0; 917 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 918 return 0; /* not a numeric host */ 919 920 if (laddr->ai_family == raddr->ai_family) { 921 if (laddr->ai_family == AF_INET) { 922 rip = (char *)&((struct sockaddr_in *)(void *) 923 raddr->ai_addr)->sin_addr.s_addr; 924 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 925 #ifdef INET6 926 } else if (laddr->ai_family == AF_INET6) { 927 rip = (char *)&((struct sockaddr_in6 *)(void *) 928 raddr->ai_addr)->sin6_addr; 929 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 930 #endif 931 } 932 933 } 934 freeaddrinfo(raddr); 935 return (ret); 936 } 937 938 /* 939 * Verify server certificate by subjectAltName. 940 */ 941 static int 942 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 943 const char *host, struct addrinfo *ip) 944 { 945 const GENERAL_NAME *name; 946 size_t nslen; 947 int i; 948 const char *ns; 949 950 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 951 name = sk_GENERAL_NAME_value(altnames, i); 952 ns = (const char *)ASN1_STRING_get0_data(name->d.ia5); 953 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 954 955 if (name->type == GEN_DNS && ip == NULL && 956 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 957 return (1); 958 else if (name->type == GEN_IPADD && ip != NULL && 959 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 960 return (1); 961 } 962 return (0); 963 } 964 965 /* 966 * Verify server certificate by CN. 967 */ 968 static int 969 fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 970 struct addrinfo *ip) 971 { 972 ASN1_STRING *namedata; 973 X509_NAME_ENTRY *nameentry; 974 int cnlen, lastpos, loc, ret; 975 unsigned char *cn; 976 977 ret = 0; 978 lastpos = -1; 979 loc = -1; 980 cn = NULL; 981 /* get most specific CN (last entry in list) and compare */ 982 while ((lastpos = X509_NAME_get_index_by_NID(subject, 983 NID_commonName, lastpos)) != -1) 984 loc = lastpos; 985 986 if (loc > -1) { 987 nameentry = X509_NAME_get_entry(subject, loc); 988 namedata = X509_NAME_ENTRY_get_data(nameentry); 989 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 990 if (ip == NULL && 991 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 992 ret = 1; 993 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 994 ret = 1; 995 OPENSSL_free(cn); 996 } 997 return (ret); 998 } 999 1000 /* 1001 * Verify that server certificate subjectAltName/CN matches 1002 * hostname. First check, if there are alternative subject names. If yes, 1003 * those have to match. Only if those don't exist it falls back to 1004 * checking the subject's CN. 1005 */ 1006 static int 1007 fetch_ssl_verify_hname(X509 *cert, const char *host) 1008 { 1009 struct addrinfo *ip; 1010 STACK_OF(GENERAL_NAME) *altnames; 1011 X509_NAME *subject; 1012 int ret; 1013 1014 ret = 0; 1015 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 1016 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 1017 NULL, NULL); 1018 1019 if (altnames != NULL) { 1020 ret = fetch_ssl_verify_altname(altnames, host, ip); 1021 } else { 1022 subject = X509_get_subject_name(cert); 1023 if (subject != NULL) 1024 ret = fetch_ssl_verify_cn(subject, host, ip); 1025 } 1026 1027 if (ip != NULL) 1028 freeaddrinfo(ip); 1029 if (altnames != NULL) 1030 GENERAL_NAMES_free(altnames); 1031 return (ret); 1032 } 1033 1034 /* 1035 * Configure transport security layer based on environment. 1036 */ 1037 static void 1038 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 1039 { 1040 long ssl_ctx_options; 1041 1042 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv3 | SSL_OP_NO_TICKET; 1043 if (getenv("SSL_NO_TLS1") != NULL) 1044 ssl_ctx_options |= SSL_OP_NO_TLSv1; 1045 if (getenv("SSL_NO_TLS1_1") != NULL) 1046 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 1047 if (getenv("SSL_NO_TLS1_2") != NULL) 1048 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 1049 if (verbose) 1050 fetch_info("SSL options: %lx", ssl_ctx_options); 1051 SSL_CTX_set_options(ctx, ssl_ctx_options); 1052 } 1053 1054 1055 /* 1056 * Configure peer verification based on environment. 1057 */ 1058 #define LOCAL_CERT_FILE _PATH_LOCALBASE "/etc/ssl/cert.pem" 1059 #define BASE_CERT_FILE "/etc/ssl/cert.pem" 1060 static int 1061 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 1062 { 1063 X509_LOOKUP *crl_lookup; 1064 X509_STORE *crl_store; 1065 const char *ca_cert_file, *ca_cert_path, *crl_file; 1066 1067 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 1068 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 1069 if (ca_cert_file == NULL && 1070 access(LOCAL_CERT_FILE, R_OK) == 0) 1071 ca_cert_file = LOCAL_CERT_FILE; 1072 if (ca_cert_file == NULL && 1073 access(BASE_CERT_FILE, R_OK) == 0) 1074 ca_cert_file = BASE_CERT_FILE; 1075 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 1076 if (verbose) { 1077 fetch_info("Peer verification enabled"); 1078 if (ca_cert_file != NULL) 1079 fetch_info("Using CA cert file: %s", 1080 ca_cert_file); 1081 if (ca_cert_path != NULL) 1082 fetch_info("Using CA cert path: %s", 1083 ca_cert_path); 1084 if (ca_cert_file == NULL && ca_cert_path == NULL) 1085 fetch_info("Using OpenSSL default " 1086 "CA cert file and path"); 1087 } 1088 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 1089 fetch_ssl_cb_verify_crt); 1090 if (ca_cert_file != NULL || ca_cert_path != NULL) 1091 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 1092 ca_cert_path); 1093 else 1094 SSL_CTX_set_default_verify_paths(ctx); 1095 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 1096 if (verbose) 1097 fetch_info("Using CRL file: %s", crl_file); 1098 crl_store = SSL_CTX_get_cert_store(ctx); 1099 crl_lookup = X509_STORE_add_lookup(crl_store, 1100 X509_LOOKUP_file()); 1101 if (crl_lookup == NULL || 1102 !X509_load_crl_file(crl_lookup, crl_file, 1103 X509_FILETYPE_PEM)) { 1104 fprintf(stderr, 1105 "Could not load CRL file %s\n", 1106 crl_file); 1107 return (0); 1108 } 1109 X509_STORE_set_flags(crl_store, 1110 X509_V_FLAG_CRL_CHECK | 1111 X509_V_FLAG_CRL_CHECK_ALL); 1112 } 1113 } 1114 return (1); 1115 } 1116 1117 /* 1118 * Configure client certificate based on environment. 1119 */ 1120 static int 1121 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 1122 { 1123 const char *client_cert_file, *client_key_file; 1124 1125 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 1126 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 1127 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 1128 if (verbose) { 1129 fetch_info("Using client cert file: %s", 1130 client_cert_file); 1131 fetch_info("Using client key file: %s", 1132 client_key_file); 1133 } 1134 if (SSL_CTX_use_certificate_chain_file(ctx, 1135 client_cert_file) != 1) { 1136 fprintf(stderr, 1137 "Could not load client certificate %s\n", 1138 client_cert_file); 1139 return (0); 1140 } 1141 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 1142 SSL_FILETYPE_PEM) != 1) { 1143 fprintf(stderr, 1144 "Could not load client key %s\n", 1145 client_key_file); 1146 return (0); 1147 } 1148 } 1149 return (1); 1150 } 1151 1152 /* 1153 * Callback for SSL certificate verification, this is called on server 1154 * cert verification. It takes no decision, but informs the user in case 1155 * verification failed. 1156 */ 1157 int 1158 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 1159 { 1160 X509 *crt; 1161 X509_NAME *name; 1162 char *str; 1163 1164 str = NULL; 1165 if (!verified) { 1166 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 1167 (name = X509_get_subject_name(crt)) != NULL) 1168 str = X509_NAME_oneline(name, 0, 0); 1169 fprintf(stderr, "Certificate verification failed for %s\n", 1170 str != NULL ? str : "no relevant certificate"); 1171 OPENSSL_free(str); 1172 } 1173 return (verified); 1174 } 1175 1176 #endif 1177 1178 /* 1179 * Enable SSL on a connection. 1180 */ 1181 int 1182 fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 1183 { 1184 #ifdef WITH_SSL 1185 int ret, ssl_err; 1186 X509_NAME *name; 1187 char *str; 1188 1189 conn->ssl_meth = SSLv23_client_method(); 1190 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); 1191 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 1192 1193 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 1194 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 1195 return (-1); 1196 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 1197 return (-1); 1198 1199 conn->ssl = SSL_new(conn->ssl_ctx); 1200 if (conn->ssl == NULL) { 1201 fprintf(stderr, "SSL context creation failed\n"); 1202 return (-1); 1203 } 1204 SSL_set_fd(conn->ssl, conn->sd); 1205 1206 #if !defined(OPENSSL_NO_TLSEXT) 1207 if (!SSL_set_tlsext_host_name(conn->ssl, 1208 __DECONST(struct url *, URL)->host)) { 1209 fprintf(stderr, 1210 "TLS server name indication extension failed for host %s\n", 1211 URL->host); 1212 return (-1); 1213 } 1214 #endif 1215 while ((ret = SSL_connect(conn->ssl)) == -1) { 1216 ssl_err = SSL_get_error(conn->ssl, ret); 1217 if (ssl_err != SSL_ERROR_WANT_READ && 1218 ssl_err != SSL_ERROR_WANT_WRITE) { 1219 ERR_print_errors_fp(stderr); 1220 return (-1); 1221 } 1222 } 1223 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 1224 1225 if (conn->ssl_cert == NULL) { 1226 fprintf(stderr, "No server SSL certificate\n"); 1227 return (-1); 1228 } 1229 1230 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 1231 if (verbose) 1232 fetch_info("Verify hostname"); 1233 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 1234 fprintf(stderr, 1235 "SSL certificate subject doesn't match host %s\n", 1236 URL->host); 1237 return (-1); 1238 } 1239 } 1240 1241 if (verbose) { 1242 fetch_info("%s connection established using %s", 1243 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 1244 name = X509_get_subject_name(conn->ssl_cert); 1245 str = X509_NAME_oneline(name, 0, 0); 1246 fetch_info("Certificate subject: %s", str); 1247 OPENSSL_free(str); 1248 name = X509_get_issuer_name(conn->ssl_cert); 1249 str = X509_NAME_oneline(name, 0, 0); 1250 fetch_info("Certificate issuer: %s", str); 1251 OPENSSL_free(str); 1252 } 1253 1254 return (0); 1255 #else 1256 (void)conn; 1257 (void)verbose; 1258 (void)URL; 1259 fprintf(stderr, "SSL support disabled\n"); 1260 return (-1); 1261 #endif 1262 } 1263 1264 #define FETCH_READ_WAIT -2 1265 #define FETCH_READ_ERROR -1 1266 #define FETCH_READ_DONE 0 1267 1268 #ifdef WITH_SSL 1269 static ssize_t 1270 fetch_ssl_read(SSL *ssl, char *buf, size_t len) 1271 { 1272 ssize_t rlen; 1273 int ssl_err; 1274 1275 rlen = SSL_read(ssl, buf, len); 1276 if (rlen < 0) { 1277 ssl_err = SSL_get_error(ssl, rlen); 1278 if (ssl_err == SSL_ERROR_WANT_READ || 1279 ssl_err == SSL_ERROR_WANT_WRITE) { 1280 return (FETCH_READ_WAIT); 1281 } else { 1282 ERR_print_errors_fp(stderr); 1283 return (FETCH_READ_ERROR); 1284 } 1285 } 1286 return (rlen); 1287 } 1288 #endif 1289 1290 static ssize_t 1291 fetch_socket_read(int sd, char *buf, size_t len) 1292 { 1293 ssize_t rlen; 1294 1295 rlen = read(sd, buf, len); 1296 if (rlen < 0) { 1297 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 1298 return (FETCH_READ_WAIT); 1299 else 1300 return (FETCH_READ_ERROR); 1301 } 1302 return (rlen); 1303 } 1304 1305 /* 1306 * Read a character from a connection w/ timeout 1307 */ 1308 ssize_t 1309 fetch_read(conn_t *conn, char *buf, size_t len) 1310 { 1311 struct timeval now, timeout, delta; 1312 struct pollfd pfd; 1313 ssize_t rlen; 1314 int deltams; 1315 1316 if (fetchTimeout > 0) { 1317 gettimeofday(&timeout, NULL); 1318 timeout.tv_sec += fetchTimeout; 1319 } 1320 1321 deltams = INFTIM; 1322 memset(&pfd, 0, sizeof pfd); 1323 pfd.fd = conn->sd; 1324 pfd.events = POLLIN | POLLERR; 1325 1326 for (;;) { 1327 /* 1328 * The socket is non-blocking. Instead of the canonical 1329 * poll() -> read(), we do the following: 1330 * 1331 * 1) call read() or SSL_read(). 1332 * 2) if we received some data, return it. 1333 * 3) if an error occurred, return -1. 1334 * 4) if read() or SSL_read() signaled EOF, return. 1335 * 5) if we did not receive any data but we're not at EOF, 1336 * call poll(). 1337 * 1338 * In the SSL case, this is necessary because if we 1339 * receive a close notification, we have to call 1340 * SSL_read() one additional time after we've read 1341 * everything we received. 1342 * 1343 * In the non-SSL case, it may improve performance (very 1344 * slightly) when reading small amounts of data. 1345 */ 1346 #ifdef WITH_SSL 1347 if (conn->ssl != NULL) 1348 rlen = fetch_ssl_read(conn->ssl, buf, len); 1349 else 1350 #endif 1351 rlen = fetch_socket_read(conn->sd, buf, len); 1352 if (rlen >= 0) { 1353 break; 1354 } else if (rlen == FETCH_READ_ERROR) { 1355 fetch_syserr(); 1356 return (-1); 1357 } 1358 // assert(rlen == FETCH_READ_WAIT); 1359 if (fetchTimeout > 0) { 1360 gettimeofday(&now, NULL); 1361 if (!timercmp(&timeout, &now, >)) { 1362 errno = ETIMEDOUT; 1363 fetch_syserr(); 1364 return (-1); 1365 } 1366 timersub(&timeout, &now, &delta); 1367 deltams = delta.tv_sec * 1000 + 1368 delta.tv_usec / 1000;; 1369 } 1370 errno = 0; 1371 pfd.revents = 0; 1372 if (poll(&pfd, 1, deltams) < 0) { 1373 if (errno == EINTR && fetchRestartCalls) 1374 continue; 1375 fetch_syserr(); 1376 return (-1); 1377 } 1378 } 1379 return (rlen); 1380 } 1381 1382 1383 /* 1384 * Read a line of text from a connection w/ timeout 1385 */ 1386 #define MIN_BUF_SIZE 1024 1387 1388 int 1389 fetch_getln(conn_t *conn) 1390 { 1391 char *tmp; 1392 size_t tmpsize; 1393 ssize_t len; 1394 char c; 1395 1396 if (conn->buf == NULL) { 1397 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 1398 errno = ENOMEM; 1399 return (-1); 1400 } 1401 conn->bufsize = MIN_BUF_SIZE; 1402 } 1403 1404 conn->buf[0] = '\0'; 1405 conn->buflen = 0; 1406 1407 do { 1408 len = fetch_read(conn, &c, 1); 1409 if (len == -1) 1410 return (-1); 1411 if (len == 0) 1412 break; 1413 conn->buf[conn->buflen++] = c; 1414 if (conn->buflen == conn->bufsize) { 1415 tmp = conn->buf; 1416 tmpsize = conn->bufsize * 2 + 1; 1417 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 1418 errno = ENOMEM; 1419 return (-1); 1420 } 1421 conn->buf = tmp; 1422 conn->bufsize = tmpsize; 1423 } 1424 } while (c != '\n'); 1425 1426 conn->buf[conn->buflen] = '\0'; 1427 DEBUGF("<<< %s", conn->buf); 1428 return (0); 1429 } 1430 1431 1432 /* 1433 * Write to a connection w/ timeout 1434 */ 1435 ssize_t 1436 fetch_write(conn_t *conn, const char *buf, size_t len) 1437 { 1438 struct iovec iov; 1439 1440 iov.iov_base = __DECONST(char *, buf); 1441 iov.iov_len = len; 1442 return fetch_writev(conn, &iov, 1); 1443 } 1444 1445 /* 1446 * Write a vector to a connection w/ timeout 1447 * Note: can modify the iovec. 1448 */ 1449 ssize_t 1450 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1451 { 1452 struct timeval now, timeout, delta; 1453 struct pollfd pfd; 1454 ssize_t wlen, total; 1455 int deltams; 1456 1457 memset(&pfd, 0, sizeof pfd); 1458 if (fetchTimeout) { 1459 pfd.fd = conn->sd; 1460 pfd.events = POLLOUT | POLLERR; 1461 gettimeofday(&timeout, NULL); 1462 timeout.tv_sec += fetchTimeout; 1463 } 1464 1465 total = 0; 1466 while (iovcnt > 0) { 1467 while (fetchTimeout && pfd.revents == 0) { 1468 gettimeofday(&now, NULL); 1469 if (!timercmp(&timeout, &now, >)) { 1470 errno = ETIMEDOUT; 1471 fetch_syserr(); 1472 return (-1); 1473 } 1474 timersub(&timeout, &now, &delta); 1475 deltams = delta.tv_sec * 1000 + 1476 delta.tv_usec / 1000; 1477 errno = 0; 1478 pfd.revents = 0; 1479 if (poll(&pfd, 1, deltams) < 0) { 1480 /* POSIX compliance */ 1481 if (errno == EAGAIN) 1482 continue; 1483 if (errno == EINTR && fetchRestartCalls) 1484 continue; 1485 return (-1); 1486 } 1487 } 1488 errno = 0; 1489 #ifdef WITH_SSL 1490 if (conn->ssl != NULL) 1491 wlen = SSL_write(conn->ssl, 1492 iov->iov_base, iov->iov_len); 1493 else 1494 #endif 1495 wlen = writev(conn->sd, iov, iovcnt); 1496 if (wlen == 0) { 1497 /* we consider a short write a failure */ 1498 /* XXX perhaps we shouldn't in the SSL case */ 1499 errno = EPIPE; 1500 fetch_syserr(); 1501 return (-1); 1502 } 1503 if (wlen < 0) { 1504 if (errno == EINTR && fetchRestartCalls) 1505 continue; 1506 return (-1); 1507 } 1508 total += wlen; 1509 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1510 wlen -= iov->iov_len; 1511 iov++; 1512 iovcnt--; 1513 } 1514 if (iovcnt > 0) { 1515 iov->iov_len -= wlen; 1516 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1517 } 1518 } 1519 return (total); 1520 } 1521 1522 1523 /* 1524 * Write a line of text to a connection w/ timeout 1525 */ 1526 int 1527 fetch_putln(conn_t *conn, const char *str, size_t len) 1528 { 1529 struct iovec iov[2]; 1530 int ret; 1531 1532 DEBUGF(">>> %s\n", str); 1533 iov[0].iov_base = __DECONST(char *, str); 1534 iov[0].iov_len = len; 1535 iov[1].iov_base = __DECONST(char *, ENDL); 1536 iov[1].iov_len = sizeof(ENDL); 1537 if (len == 0) 1538 ret = fetch_writev(conn, &iov[1], 1); 1539 else 1540 ret = fetch_writev(conn, iov, 2); 1541 if (ret == -1) 1542 return (-1); 1543 return (0); 1544 } 1545 1546 1547 /* 1548 * Close connection 1549 */ 1550 int 1551 fetch_close(conn_t *conn) 1552 { 1553 int ret; 1554 1555 if (--conn->ref > 0) 1556 return (0); 1557 #ifdef WITH_SSL 1558 if (conn->ssl) { 1559 SSL_shutdown(conn->ssl); 1560 SSL_set_connect_state(conn->ssl); 1561 SSL_free(conn->ssl); 1562 conn->ssl = NULL; 1563 } 1564 if (conn->ssl_ctx) { 1565 SSL_CTX_free(conn->ssl_ctx); 1566 conn->ssl_ctx = NULL; 1567 } 1568 if (conn->ssl_cert) { 1569 X509_free(conn->ssl_cert); 1570 conn->ssl_cert = NULL; 1571 } 1572 #endif 1573 ret = close(conn->sd); 1574 free(conn->buf); 1575 free(conn); 1576 return (ret); 1577 } 1578 1579 1580 /*** Directory-related utility functions *************************************/ 1581 1582 int 1583 fetch_add_entry(struct url_ent **p, int *size, int *len, 1584 const char *name, struct url_stat *us) 1585 { 1586 struct url_ent *tmp; 1587 1588 if (*p == NULL) { 1589 *size = 0; 1590 *len = 0; 1591 } 1592 1593 if (*len >= *size - 1) { 1594 tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p)); 1595 if (tmp == NULL) { 1596 errno = ENOMEM; 1597 fetch_syserr(); 1598 return (-1); 1599 } 1600 *size = (*size * 2 + 1); 1601 *p = tmp; 1602 } 1603 1604 tmp = *p + *len; 1605 snprintf(tmp->name, PATH_MAX, "%s", name); 1606 memcpy(&tmp->stat, us, sizeof(*us)); 1607 1608 (*len)++; 1609 (++tmp)->name[0] = 0; 1610 1611 return (0); 1612 } 1613 1614 1615 /*** Authentication-related utility functions ********************************/ 1616 1617 static const char * 1618 fetch_read_word(FILE *f) 1619 { 1620 static char word[1024]; 1621 1622 if (fscanf(f, " %1023s ", word) != 1) 1623 return (NULL); 1624 return (word); 1625 } 1626 1627 static int 1628 fetch_netrc_open(void) 1629 { 1630 struct passwd *pwd; 1631 char fn[PATH_MAX]; 1632 const char *p; 1633 int fd, serrno; 1634 1635 if ((p = getenv("NETRC")) != NULL) { 1636 DEBUGF("NETRC=%s\n", p); 1637 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1638 fetch_info("$NETRC specifies a file name " 1639 "longer than PATH_MAX"); 1640 return (-1); 1641 } 1642 } else { 1643 if ((p = getenv("HOME")) == NULL) { 1644 if ((pwd = getpwuid(getuid())) == NULL || 1645 (p = pwd->pw_dir) == NULL) 1646 return (-1); 1647 } 1648 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1649 return (-1); 1650 } 1651 1652 if ((fd = open(fn, O_RDONLY)) < 0) { 1653 serrno = errno; 1654 DEBUGF("%s: %s\n", fn, strerror(serrno)); 1655 errno = serrno; 1656 } 1657 return (fd); 1658 } 1659 1660 /* 1661 * Get authentication data for a URL from .netrc 1662 */ 1663 int 1664 fetch_netrc_auth(struct url *url) 1665 { 1666 const char *word; 1667 int serrno; 1668 FILE *f; 1669 1670 if (url->netrcfd < 0) 1671 url->netrcfd = fetch_netrc_open(); 1672 if (url->netrcfd < 0) 1673 return (-1); 1674 if ((f = fdopen(url->netrcfd, "r")) == NULL) { 1675 serrno = errno; 1676 DEBUGF("fdopen(netrcfd): %s", strerror(errno)); 1677 close(url->netrcfd); 1678 url->netrcfd = -1; 1679 errno = serrno; 1680 return (-1); 1681 } 1682 rewind(f); 1683 DEBUGF("searching netrc for %s\n", url->host); 1684 while ((word = fetch_read_word(f)) != NULL) { 1685 if (strcmp(word, "default") == 0) { 1686 DEBUGF("using default netrc settings\n"); 1687 break; 1688 } 1689 if (strcmp(word, "machine") == 0 && 1690 (word = fetch_read_word(f)) != NULL && 1691 strcasecmp(word, url->host) == 0) { 1692 DEBUGF("using netrc settings for %s\n", word); 1693 break; 1694 } 1695 } 1696 if (word == NULL) 1697 goto ferr; 1698 while ((word = fetch_read_word(f)) != NULL) { 1699 if (strcmp(word, "login") == 0) { 1700 if ((word = fetch_read_word(f)) == NULL) 1701 goto ferr; 1702 if (snprintf(url->user, sizeof(url->user), 1703 "%s", word) > (int)sizeof(url->user)) { 1704 fetch_info("login name in .netrc is too long"); 1705 url->user[0] = '\0'; 1706 } 1707 } else if (strcmp(word, "password") == 0) { 1708 if ((word = fetch_read_word(f)) == NULL) 1709 goto ferr; 1710 if (snprintf(url->pwd, sizeof(url->pwd), 1711 "%s", word) > (int)sizeof(url->pwd)) { 1712 fetch_info("password in .netrc is too long"); 1713 url->pwd[0] = '\0'; 1714 } 1715 } else if (strcmp(word, "account") == 0) { 1716 if ((word = fetch_read_word(f)) == NULL) 1717 goto ferr; 1718 /* XXX not supported! */ 1719 } else { 1720 break; 1721 } 1722 } 1723 fclose(f); 1724 url->netrcfd = -1; 1725 return (0); 1726 ferr: 1727 serrno = errno; 1728 fclose(f); 1729 url->netrcfd = -1; 1730 errno = serrno; 1731 return (-1); 1732 } 1733 1734 /* 1735 * The no_proxy environment variable specifies a set of domains for 1736 * which the proxy should not be consulted; the contents is a comma-, 1737 * or space-separated list of domain names. A single asterisk will 1738 * override all proxy variables and no transactions will be proxied 1739 * (for compatibility with lynx and curl, see the discussion at 1740 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1741 */ 1742 int 1743 fetch_no_proxy_match(const char *host) 1744 { 1745 const char *no_proxy, *p, *q; 1746 size_t h_len, d_len; 1747 1748 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1749 (no_proxy = getenv("no_proxy")) == NULL) 1750 return (0); 1751 1752 /* asterisk matches any hostname */ 1753 if (strcmp(no_proxy, "*") == 0) 1754 return (1); 1755 1756 h_len = strlen(host); 1757 p = no_proxy; 1758 do { 1759 /* position p at the beginning of a domain suffix */ 1760 while (*p == ',' || isspace((unsigned char)*p)) 1761 p++; 1762 1763 /* position q at the first separator character */ 1764 for (q = p; *q; ++q) 1765 if (*q == ',' || isspace((unsigned char)*q)) 1766 break; 1767 1768 d_len = q - p; 1769 if (d_len > 0 && h_len >= d_len && 1770 strncasecmp(host + h_len - d_len, 1771 p, d_len) == 0) { 1772 /* domain name matches */ 1773 return (1); 1774 } 1775 1776 p = q + 1; 1777 } while (*q); 1778 1779 return (0); 1780 } 1781