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/param.h> 33 #include <sys/socket.h> 34 #include <sys/time.h> 35 #include <sys/uio.h> 36 37 #include <netinet/in.h> 38 39 #include <ctype.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <inttypes.h> 43 #include <netdb.h> 44 #include <paths.h> 45 #include <poll.h> 46 #include <pwd.h> 47 #include <stdarg.h> 48 #include <stdlib.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #ifdef WITH_SSL 54 #include <openssl/x509v3.h> 55 #endif 56 57 #include "fetch.h" 58 #include "common.h" 59 60 61 /*** Local data **************************************************************/ 62 63 /* 64 * Error messages for resolver errors 65 */ 66 static struct fetcherr netdb_errlist[] = { 67 #ifdef EAI_ADDRFAMILY 68 { EAI_ADDRFAMILY, FETCH_RESOLV, "Address family for host not supported" }, 69 #endif 70 #ifdef EAI_NODATA 71 { EAI_NODATA, FETCH_RESOLV, "No address for host" }, 72 #endif 73 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 74 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 75 { EAI_NONAME, FETCH_RESOLV, "Host does not resolve" }, 76 { -1, FETCH_UNKNOWN, "Unknown resolver error" } 77 }; 78 79 /* 80 * SOCKS5 error enumerations 81 */ 82 enum SOCKS5_ERR { 83 /* Protocol errors */ 84 SOCKS5_ERR_SELECTION, 85 SOCKS5_ERR_READ_METHOD, 86 SOCKS5_ERR_VER5_ONLY, 87 SOCKS5_ERR_NOMETHODS, 88 SOCKS5_ERR_NOTIMPLEMENTED, 89 SOCKS5_ERR_HOSTNAME_SIZE, 90 SOCKS5_ERR_REQUEST, 91 SOCKS5_ERR_REPLY, 92 SOCKS5_ERR_NON_VER5_RESP, 93 SOCKS5_ERR_GENERAL, 94 SOCKS5_ERR_NOT_ALLOWED, 95 SOCKS5_ERR_NET_UNREACHABLE, 96 SOCKS5_ERR_HOST_UNREACHABLE, 97 SOCKS5_ERR_CONN_REFUSED, 98 SOCKS5_ERR_TTL_EXPIRED, 99 SOCKS5_ERR_COM_UNSUPPORTED, 100 SOCKS5_ERR_ADDR_UNSUPPORTED, 101 SOCKS5_ERR_UNSPECIFIED, 102 /* Configuration errors */ 103 SOCKS5_ERR_BAD_HOST, 104 SOCKS5_ERR_BAD_PROXY_FORMAT, 105 SOCKS5_ERR_BAD_PORT 106 }; 107 108 /* 109 * Error messages for SOCKS5 errors 110 */ 111 static struct fetcherr socks5_errlist[] = { 112 /* SOCKS5 protocol errors */ 113 { SOCKS5_ERR_SELECTION, FETCH_ABORT, "SOCKS5: Failed to send selection method" }, 114 { SOCKS5_ERR_READ_METHOD, FETCH_ABORT, "SOCKS5: Failed to read method" }, 115 { SOCKS5_ERR_VER5_ONLY, FETCH_PROTO, "SOCKS5: Only version 5 is implemented" }, 116 { SOCKS5_ERR_NOMETHODS, FETCH_PROTO, "SOCKS5: No acceptable methods" }, 117 { SOCKS5_ERR_NOTIMPLEMENTED, FETCH_PROTO, "SOCKS5: Method currently not implemented" }, 118 { SOCKS5_ERR_HOSTNAME_SIZE, FETCH_PROTO, "SOCKS5: Hostname size is above 256 bytes" }, 119 { SOCKS5_ERR_REQUEST, FETCH_PROTO, "SOCKS5: Failed to request" }, 120 { SOCKS5_ERR_REPLY, FETCH_PROTO, "SOCKS5: Failed to receive reply" }, 121 { SOCKS5_ERR_NON_VER5_RESP, FETCH_PROTO, "SOCKS5: Server responded with a non-version 5 response" }, 122 { SOCKS5_ERR_GENERAL, FETCH_ABORT, "SOCKS5: General server failure" }, 123 { SOCKS5_ERR_NOT_ALLOWED, FETCH_AUTH, "SOCKS5: Connection not allowed by ruleset" }, 124 { SOCKS5_ERR_NET_UNREACHABLE, FETCH_NETWORK, "SOCKS5: Network unreachable" }, 125 { SOCKS5_ERR_HOST_UNREACHABLE, FETCH_ABORT, "SOCKS5: Host unreachable" }, 126 { SOCKS5_ERR_CONN_REFUSED, FETCH_ABORT, "SOCKS5: Connection refused" }, 127 { SOCKS5_ERR_TTL_EXPIRED, FETCH_TIMEOUT, "SOCKS5: TTL expired" }, 128 { SOCKS5_ERR_COM_UNSUPPORTED, FETCH_PROTO, "SOCKS5: Command not supported" }, 129 { SOCKS5_ERR_ADDR_UNSUPPORTED, FETCH_ABORT, "SOCKS5: Address type not supported" }, 130 { SOCKS5_ERR_UNSPECIFIED, FETCH_UNKNOWN, "SOCKS5: Unspecified error" }, 131 /* Configuration error */ 132 { SOCKS5_ERR_BAD_HOST, FETCH_ABORT, "SOCKS5: Bad proxy host" }, 133 { SOCKS5_ERR_BAD_PROXY_FORMAT, FETCH_ABORT, "SOCKS5: Bad proxy format" }, 134 { SOCKS5_ERR_BAD_PORT, FETCH_ABORT, "SOCKS5: Bad port" } 135 }; 136 137 /* End-of-Line */ 138 static const char ENDL[2] = { '\r', '\n' }; 139 140 141 /*** Error-reporting functions ***********************************************/ 142 143 /* 144 * Map error code to string 145 */ 146 static struct fetcherr * 147 fetch_finderr(struct fetcherr *p, int e) 148 { 149 while (p->num != -1 && p->num != e) 150 p++; 151 return (p); 152 } 153 154 /* 155 * Set error code 156 */ 157 void 158 fetch_seterr(struct fetcherr *p, int e) 159 { 160 p = fetch_finderr(p, e); 161 fetchLastErrCode = p->cat; 162 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 163 } 164 165 /* 166 * Set error code according to errno 167 */ 168 void 169 fetch_syserr(void) 170 { 171 switch (errno) { 172 case 0: 173 fetchLastErrCode = FETCH_OK; 174 break; 175 case EPERM: 176 case EACCES: 177 case EROFS: 178 case EAUTH: 179 case ENEEDAUTH: 180 fetchLastErrCode = FETCH_AUTH; 181 break; 182 case ENOENT: 183 case EISDIR: /* XXX */ 184 fetchLastErrCode = FETCH_UNAVAIL; 185 break; 186 case ENOMEM: 187 fetchLastErrCode = FETCH_MEMORY; 188 break; 189 case EBUSY: 190 case EAGAIN: 191 fetchLastErrCode = FETCH_TEMP; 192 break; 193 case EEXIST: 194 fetchLastErrCode = FETCH_EXISTS; 195 break; 196 case ENOSPC: 197 fetchLastErrCode = FETCH_FULL; 198 break; 199 case EADDRINUSE: 200 case EADDRNOTAVAIL: 201 case ENETDOWN: 202 case ENETUNREACH: 203 case ENETRESET: 204 case EHOSTUNREACH: 205 fetchLastErrCode = FETCH_NETWORK; 206 break; 207 case ECONNABORTED: 208 case ECONNRESET: 209 fetchLastErrCode = FETCH_ABORT; 210 break; 211 case ETIMEDOUT: 212 fetchLastErrCode = FETCH_TIMEOUT; 213 break; 214 case ECONNREFUSED: 215 case EHOSTDOWN: 216 fetchLastErrCode = FETCH_DOWN; 217 break; 218 default: 219 fetchLastErrCode = FETCH_UNKNOWN; 220 } 221 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); 222 } 223 224 225 /* 226 * Emit status message 227 */ 228 void 229 fetch_info(const char *fmt, ...) 230 { 231 va_list ap; 232 233 va_start(ap, fmt); 234 vfprintf(stderr, fmt, ap); 235 va_end(ap); 236 fputc('\n', stderr); 237 } 238 239 240 /*** Network-related utility functions ***************************************/ 241 242 /* 243 * Return the default port for a scheme 244 */ 245 int 246 fetch_default_port(const char *scheme) 247 { 248 struct servent *se; 249 250 if ((se = getservbyname(scheme, "tcp")) != NULL) 251 return (ntohs(se->s_port)); 252 if (strcmp(scheme, SCHEME_FTP) == 0) 253 return (FTP_DEFAULT_PORT); 254 if (strcmp(scheme, SCHEME_HTTP) == 0) 255 return (HTTP_DEFAULT_PORT); 256 return (0); 257 } 258 259 /* 260 * Return the default proxy port for a scheme 261 */ 262 int 263 fetch_default_proxy_port(const char *scheme) 264 { 265 if (strcmp(scheme, SCHEME_FTP) == 0) 266 return (FTP_DEFAULT_PROXY_PORT); 267 if (strcmp(scheme, SCHEME_HTTP) == 0) 268 return (HTTP_DEFAULT_PROXY_PORT); 269 return (0); 270 } 271 272 273 /* 274 * Create a connection for an existing descriptor. 275 */ 276 conn_t * 277 fetch_reopen(int sd) 278 { 279 conn_t *conn; 280 int flags; 281 int opt = 1; 282 283 /* allocate and fill connection structure */ 284 if ((conn = calloc(1, sizeof(*conn))) == NULL) 285 return (NULL); 286 flags = fcntl(sd, F_GETFD); 287 if (flags != -1 && (flags & FD_CLOEXEC) == 0) 288 (void)fcntl(sd, F_SETFD, flags | FD_CLOEXEC); 289 flags = fcntl(sd, F_GETFL); 290 if (flags != -1 && (flags & O_NONBLOCK) == 0) 291 (void)fcntl(sd, F_SETFL, flags | O_NONBLOCK); 292 (void)setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt)); 293 conn->sd = sd; 294 ++conn->ref; 295 return (conn); 296 } 297 298 299 /* 300 * Bump a connection's reference count. 301 */ 302 conn_t * 303 fetch_ref(conn_t *conn) 304 { 305 306 ++conn->ref; 307 return (conn); 308 } 309 310 311 /* 312 * Resolve an address 313 */ 314 struct addrinfo * 315 fetch_resolve(const char *addr, int port, int af) 316 { 317 char hbuf[256], sbuf[8]; 318 struct addrinfo hints, *res; 319 const char *hb, *he, *sep; 320 const char *host, *service; 321 int err, len; 322 323 /* first, check for a bracketed IPv6 address */ 324 if (*addr == '[') { 325 hb = addr + 1; 326 if ((sep = strchr(hb, ']')) == NULL) { 327 errno = EINVAL; 328 goto syserr; 329 } 330 he = sep++; 331 } else { 332 hb = addr; 333 sep = strchrnul(hb, ':'); 334 he = sep; 335 } 336 337 /* see if we need to copy the host name */ 338 if (*he != '\0') { 339 len = snprintf(hbuf, sizeof(hbuf), 340 "%.*s", (int)(he - hb), hb); 341 if (len < 0) 342 goto syserr; 343 if (len >= (int)sizeof(hbuf)) { 344 errno = ENAMETOOLONG; 345 goto syserr; 346 } 347 host = hbuf; 348 } else { 349 host = hb; 350 } 351 352 /* was it followed by a service name? */ 353 if (*sep == '\0' && port != 0) { 354 if (port < 1 || port > 65535) { 355 errno = EINVAL; 356 goto syserr; 357 } 358 if (snprintf(sbuf, sizeof(sbuf), "%d", port) < 0) 359 goto syserr; 360 service = sbuf; 361 } else if (*sep != '\0') { 362 service = sep + 1; 363 } else { 364 service = NULL; 365 } 366 367 /* resolve */ 368 memset(&hints, 0, sizeof(hints)); 369 hints.ai_family = af; 370 hints.ai_socktype = SOCK_STREAM; 371 hints.ai_flags = AI_ADDRCONFIG; 372 if ((err = getaddrinfo(host, service, &hints, &res)) != 0) { 373 netdb_seterr(err); 374 return (NULL); 375 } 376 return (res); 377 syserr: 378 fetch_syserr(); 379 return (NULL); 380 } 381 382 383 /* 384 * Bind a socket to a specific local address 385 */ 386 int 387 fetch_bind(int sd, int af, const char *addr) 388 { 389 struct addrinfo *cliai, *ai; 390 int err; 391 392 if ((cliai = fetch_resolve(addr, 0, af)) == NULL) 393 return (-1); 394 for (ai = cliai; ai != NULL; ai = ai->ai_next) 395 if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0) 396 break; 397 if (err != 0) 398 fetch_syserr(); 399 freeaddrinfo(cliai); 400 return (err == 0 ? 0 : -1); 401 } 402 403 404 /* 405 * SOCKS5 connection initiation, based on RFC 1928 406 * Default DNS resolution over SOCKS5 407 */ 408 int 409 fetch_socks5_init(conn_t *conn, const char *host, int port, int verbose) 410 { 411 /* 412 * Size is based on largest packet prefix (4 bytes) + 413 * Largest FQDN (256) + one byte size (1) + 414 * Port (2) 415 */ 416 unsigned char buf[BUFF_SIZE]; 417 unsigned char *ptr; 418 int ret = 1; 419 420 if (verbose) 421 fetch_info("Initializing SOCKS5 connection: %s:%d", host, port); 422 423 /* Connection initialization */ 424 ptr = buf; 425 *ptr++ = SOCKS_VERSION_5; 426 *ptr++ = SOCKS_CONNECTION; 427 *ptr++ = SOCKS_RSV; 428 429 if (fetch_write(conn, buf, 3) != 3) { 430 ret = SOCKS5_ERR_SELECTION; 431 goto fail; 432 } 433 434 /* Verify response from SOCKS5 server */ 435 if (fetch_read(conn, buf, 2) != 2) { 436 ret = SOCKS5_ERR_READ_METHOD; 437 goto fail; 438 } 439 440 ptr = buf; 441 if (ptr[0] != SOCKS_VERSION_5) { 442 ret = SOCKS5_ERR_VER5_ONLY; 443 goto fail; 444 } 445 if (ptr[1] == SOCKS_NOMETHODS) { 446 ret = SOCKS5_ERR_NOMETHODS; 447 goto fail; 448 } 449 else if (ptr[1] != SOCKS5_NOTIMPLEMENTED) { 450 ret = SOCKS5_ERR_NOTIMPLEMENTED; 451 goto fail; 452 } 453 454 /* Send Request */ 455 *ptr++ = SOCKS_VERSION_5; 456 *ptr++ = SOCKS_CONNECTION; 457 *ptr++ = SOCKS_RSV; 458 /* Encode all targets as a hostname to avoid DNS leaks */ 459 *ptr++ = SOCKS_ATYP_DOMAINNAME; 460 if (strlen(host) > FQDN_SIZE) { 461 ret = SOCKS5_ERR_HOSTNAME_SIZE; 462 goto fail; 463 } 464 *ptr++ = strlen(host); 465 memcpy(ptr, host, strlen(host)); 466 ptr = ptr + strlen(host); 467 468 port = htons(port); 469 *ptr++ = port & 0x00ff; 470 *ptr++ = (port & 0xff00) >> 8; 471 472 if (fetch_write(conn, buf, ptr - buf) != ptr - buf) { 473 ret = SOCKS5_ERR_REQUEST; 474 goto fail; 475 } 476 477 /* BND.ADDR is variable length, read the largest on non-blocking socket */ 478 if (!fetch_read(conn, buf, BUFF_SIZE)) { 479 ret = SOCKS5_ERR_REPLY; 480 goto fail; 481 } 482 483 ptr = buf; 484 if (*ptr++ != SOCKS_VERSION_5) { 485 ret = SOCKS5_ERR_NON_VER5_RESP; 486 goto fail; 487 } 488 489 switch(*ptr++) { 490 case SOCKS_SUCCESS: 491 break; 492 case SOCKS_GENERAL_FAILURE: 493 ret = SOCKS5_ERR_GENERAL; 494 goto fail; 495 case SOCKS_CONNECTION_NOT_ALLOWED: 496 ret = SOCKS5_ERR_NOT_ALLOWED; 497 goto fail; 498 case SOCKS_NETWORK_UNREACHABLE: 499 ret = SOCKS5_ERR_NET_UNREACHABLE; 500 goto fail; 501 case SOCKS_HOST_UNREACHABLE: 502 ret = SOCKS5_ERR_HOST_UNREACHABLE; 503 goto fail; 504 case SOCKS_CONNECTION_REFUSED: 505 ret = SOCKS5_ERR_CONN_REFUSED; 506 goto fail; 507 case SOCKS_TTL_EXPIRED: 508 ret = SOCKS5_ERR_TTL_EXPIRED; 509 goto fail; 510 case SOCKS_COMMAND_NOT_SUPPORTED: 511 ret = SOCKS5_ERR_COM_UNSUPPORTED; 512 goto fail; 513 case SOCKS_ADDRESS_NOT_SUPPORTED: 514 ret = SOCKS5_ERR_ADDR_UNSUPPORTED; 515 goto fail; 516 default: 517 ret = SOCKS5_ERR_UNSPECIFIED; 518 goto fail; 519 } 520 521 return (ret); 522 523 fail: 524 socks5_seterr(ret); 525 return (0); 526 } 527 528 /* 529 * Perform SOCKS5 initialization 530 */ 531 int 532 fetch_socks5_getenv(char **host, int *port) 533 { 534 char *socks5env, *endptr, *ext; 535 const char *portDelim; 536 size_t slen; 537 538 portDelim = ":"; 539 if ((socks5env = getenv("SOCKS5_PROXY")) == NULL || *socks5env == '\0') { 540 *host = NULL; 541 *port = -1; 542 return (-1); 543 } 544 545 /* 546 * IPv6 addresses begin and end in brackets. Set the port delimiter 547 * accordingly and search for it so we can do appropriate validation. 548 */ 549 if (socks5env[0] == '[') 550 portDelim = "]:"; 551 552 slen = strlen(socks5env); 553 ext = strstr(socks5env, portDelim); 554 if (socks5env[0] == '[') { 555 if (socks5env[slen - 1] == ']') { 556 *host = strndup(socks5env, slen); 557 } else if (ext != NULL) { 558 *host = strndup(socks5env, ext - socks5env + 1); 559 } else { 560 socks5_seterr(SOCKS5_ERR_BAD_PROXY_FORMAT); 561 return (0); 562 } 563 } else { 564 *host = strndup(socks5env, ext - socks5env); 565 } 566 567 if (*host == NULL) { 568 fprintf(stderr, "Failure to allocate memory, exiting.\n"); 569 return (-1); 570 } 571 if (ext == NULL) { 572 *port = 1080; /* Default port as defined in RFC1928 */ 573 } else { 574 ext += strlen(portDelim); 575 errno = 0; 576 *port = strtoimax(ext, (char **)&endptr, 10); 577 if (*endptr != '\0' || errno != 0 || *port < 0 || 578 *port > 65535) { 579 free(*host); 580 *host = NULL; 581 socks5_seterr(SOCKS5_ERR_BAD_PORT); 582 return (0); 583 } 584 } 585 586 return (2); 587 } 588 589 590 /* 591 * Establish a TCP connection to the specified port on the specified host. 592 */ 593 conn_t * 594 fetch_connect(const char *host, int port, int af, int verbose) 595 { 596 struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai; 597 const char *bindaddr; 598 conn_t *conn = NULL; 599 int err = 0, sd = -1; 600 char *sockshost; 601 int socksport; 602 603 DEBUGF("---> %s:%d\n", host, port); 604 605 /* 606 * Check if SOCKS5_PROXY env variable is set. fetch_socks5_getenv 607 * will either set sockshost = NULL or allocate memory in all cases. 608 */ 609 sockshost = NULL; 610 if (!fetch_socks5_getenv(&sockshost, &socksport)) 611 goto fail; 612 613 /* Not using SOCKS5 proxy */ 614 if (sockshost == NULL) { 615 /* resolve server address */ 616 if (verbose) 617 fetch_info("resolving server address: %s:%d", host, 618 port); 619 if ((sais = fetch_resolve(host, port, af)) == NULL) 620 goto fail; 621 622 /* resolve client address */ 623 bindaddr = getenv("FETCH_BIND_ADDRESS"); 624 if (bindaddr != NULL && *bindaddr != '\0') { 625 if (verbose) 626 fetch_info("resolving client address: %s", 627 bindaddr); 628 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL) 629 goto fail; 630 } 631 } else { 632 /* resolve socks5 proxy address */ 633 if (verbose) 634 fetch_info("resolving SOCKS5 server address: %s:%d", 635 sockshost, socksport); 636 if ((sais = fetch_resolve(sockshost, socksport, af)) == NULL) { 637 socks5_seterr(SOCKS5_ERR_BAD_HOST); 638 goto fail; 639 } 640 } 641 642 /* try each server address in turn */ 643 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) { 644 /* open socket */ 645 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0) 646 goto syserr; 647 /* attempt to bind to client address */ 648 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) { 649 if (cai->ai_family != sai->ai_family) 650 continue; 651 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0) 652 break; 653 } 654 if (err != 0) { 655 if (verbose) 656 fetch_info("failed to bind to %s", bindaddr); 657 goto syserr; 658 } 659 /* attempt to connect to server address */ 660 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0) 661 break; 662 /* clean up before next attempt */ 663 close(sd); 664 sd = -1; 665 } 666 if (err != 0) { 667 if (verbose && sockshost == NULL) { 668 fetch_info("failed to connect to %s:%d", host, port); 669 goto syserr; 670 } else if (sockshost != NULL) { 671 if (verbose) 672 fetch_info( 673 "failed to connect to SOCKS5 server %s:%d", 674 sockshost, socksport); 675 socks5_seterr(SOCKS5_ERR_CONN_REFUSED); 676 goto fail; 677 } 678 goto syserr; 679 } 680 681 if ((conn = fetch_reopen(sd)) == NULL) 682 goto syserr; 683 684 if (sockshost) 685 if (!fetch_socks5_init(conn, host, port, verbose)) 686 goto fail; 687 free(sockshost); 688 if (cais != NULL) 689 freeaddrinfo(cais); 690 if (sais != NULL) 691 freeaddrinfo(sais); 692 return (conn); 693 syserr: 694 fetch_syserr(); 695 fail: 696 free(sockshost); 697 /* Fully close if it was opened; otherwise just don't leak the fd. */ 698 if (conn != NULL) 699 fetch_close(conn); 700 else if (sd >= 0) 701 close(sd); 702 if (cais != NULL) 703 freeaddrinfo(cais); 704 if (sais != NULL) 705 freeaddrinfo(sais); 706 return (NULL); 707 } 708 709 #ifdef WITH_SSL 710 /* 711 * Convert characters A-Z to lowercase (intentionally avoid any locale 712 * specific conversions). 713 */ 714 static char 715 fetch_ssl_tolower(char in) 716 { 717 if (in >= 'A' && in <= 'Z') 718 return (in + 32); 719 else 720 return (in); 721 } 722 723 /* 724 * isalpha implementation that intentionally avoids any locale specific 725 * conversions. 726 */ 727 static int 728 fetch_ssl_isalpha(char in) 729 { 730 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 731 } 732 733 /* 734 * Check if passed hostnames a and b are equal. 735 */ 736 static int 737 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 738 size_t blen) 739 { 740 size_t i; 741 742 if (alen != blen) 743 return (0); 744 for (i = 0; i < alen; ++i) { 745 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 746 return (0); 747 } 748 return (1); 749 } 750 751 /* 752 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 753 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 754 * numeric characters. Double hyphens (like they're found in IDN a-labels 755 * 'xn--') are not allowed. Empty labels are invalid. 756 */ 757 static int 758 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 759 { 760 size_t i; 761 762 if (!len || l[0] == '-' || l[len-1] == '-') 763 return (0); 764 for (i = 0; i < len; ++i) { 765 if (!isdigit(l[i]) && 766 !fetch_ssl_isalpha(l[i]) && 767 !(l[i] == '*' && wcok) && 768 !(l[i] == '-' && l[i - 1] != '-')) 769 return (0); 770 } 771 return (1); 772 } 773 774 /* 775 * Check if host name consists only of numbers. This might indicate an IP 776 * address, which is not a good idea for CN wildcard comparison. 777 */ 778 static int 779 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 780 { 781 size_t i; 782 783 for (i = 0; i < len; ++i) { 784 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 785 hostname[i] == '.')) 786 return (0); 787 } 788 return (1); 789 } 790 791 /* 792 * Check if the host name h passed matches the pattern passed in m which 793 * is usually part of subjectAltName or CN of a certificate presented to 794 * the client. This includes wildcard matching. The algorithm is based on 795 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 796 */ 797 static int 798 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 799 size_t mlen) 800 { 801 int delta, hdotidx, mdot1idx, wcidx; 802 const char *hdot, *mdot1, *mdot2; 803 const char *wc; /* wildcard */ 804 805 if (!(h && *h && m && *m)) 806 return (0); 807 if ((wc = strnstr(m, "*", mlen)) == NULL) 808 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 809 wcidx = wc - m; 810 /* hostname should not be just dots and numbers */ 811 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 812 return (0); 813 /* only one wildcard allowed in pattern */ 814 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 815 return (0); 816 /* 817 * there must be at least two more domain labels and 818 * wildcard has to be in the leftmost label (RFC6125) 819 */ 820 mdot1 = strnstr(m, ".", mlen); 821 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 822 return (0); 823 mdot1idx = mdot1 - m; 824 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 825 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 826 return (0); 827 /* hostname must contain a dot and not be the 1st char */ 828 hdot = strnstr(h, ".", hlen); 829 if (hdot == NULL || hdot == h) 830 return (0); 831 hdotidx = hdot - h; 832 /* 833 * host part of hostname must be at least as long as 834 * pattern it's supposed to match 835 */ 836 if (hdotidx < mdot1idx) 837 return (0); 838 /* 839 * don't allow wildcards in non-traditional domain names 840 * (IDN, A-label, U-label...) 841 */ 842 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 843 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 844 return (0); 845 /* match domain part (part after first dot) */ 846 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 847 mlen - mdot1idx)) 848 return (0); 849 /* match part left of wildcard */ 850 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 851 return (0); 852 /* match part right of wildcard */ 853 delta = mdot1idx - wcidx - 1; 854 if (!fetch_ssl_hname_equal(hdot - delta, delta, 855 mdot1 - delta, delta)) 856 return (0); 857 /* all tests succeeded, it's a match */ 858 return (1); 859 } 860 861 /* 862 * Get numeric host address info - returns NULL if host was not an IP 863 * address. The caller is responsible for deallocation using 864 * freeaddrinfo(3). 865 */ 866 static struct addrinfo * 867 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 868 { 869 struct addrinfo hints, *res; 870 char *host; 871 872 host = (char *)malloc(len + 1); 873 memcpy(host, hostname, len); 874 host[len] = '\0'; 875 memset(&hints, 0, sizeof(hints)); 876 hints.ai_family = PF_UNSPEC; 877 hints.ai_socktype = SOCK_STREAM; 878 hints.ai_protocol = 0; 879 hints.ai_flags = AI_NUMERICHOST; 880 /* port is not relevant for this purpose */ 881 if (getaddrinfo(host, "443", &hints, &res) != 0) 882 res = NULL; 883 free(host); 884 return res; 885 } 886 887 /* 888 * Compare ip address in addrinfo with address passes. 889 */ 890 static int 891 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 892 size_t rhostlen) 893 { 894 const void *left; 895 896 if (lhost->ai_family == AF_INET && rhostlen == 4) { 897 left = (void *)&((struct sockaddr_in*)(void *) 898 lhost->ai_addr)->sin_addr.s_addr; 899 #ifdef INET6 900 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 901 left = (void *)&((struct sockaddr_in6 *)(void *) 902 lhost->ai_addr)->sin6_addr; 903 #endif 904 } else 905 return (0); 906 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 907 } 908 909 /* 910 * Compare ip address in addrinfo with host passed. If host is not an IP 911 * address, comparison will fail. 912 */ 913 static int 914 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 915 size_t rlen) 916 { 917 struct addrinfo *raddr; 918 int ret; 919 char *rip; 920 921 ret = 0; 922 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 923 return 0; /* not a numeric host */ 924 925 if (laddr->ai_family == raddr->ai_family) { 926 if (laddr->ai_family == AF_INET) { 927 rip = (char *)&((struct sockaddr_in *)(void *) 928 raddr->ai_addr)->sin_addr.s_addr; 929 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 930 #ifdef INET6 931 } else if (laddr->ai_family == AF_INET6) { 932 rip = (char *)&((struct sockaddr_in6 *)(void *) 933 raddr->ai_addr)->sin6_addr; 934 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 935 #endif 936 } 937 938 } 939 freeaddrinfo(raddr); 940 return (ret); 941 } 942 943 /* 944 * Verify server certificate by subjectAltName. 945 */ 946 static int 947 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 948 const char *host, struct addrinfo *ip) 949 { 950 const GENERAL_NAME *name; 951 size_t nslen; 952 int i; 953 const char *ns; 954 955 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 956 name = sk_GENERAL_NAME_value(altnames, i); 957 ns = (const char *)ASN1_STRING_get0_data(name->d.ia5); 958 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 959 960 if (name->type == GEN_DNS && ip == NULL && 961 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 962 return (1); 963 else if (name->type == GEN_IPADD && ip != NULL && 964 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 965 return (1); 966 } 967 return (0); 968 } 969 970 /* 971 * Verify server certificate by CN. 972 */ 973 static int 974 fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 975 struct addrinfo *ip) 976 { 977 ASN1_STRING *namedata; 978 X509_NAME_ENTRY *nameentry; 979 int cnlen, lastpos, loc, ret; 980 unsigned char *cn; 981 982 ret = 0; 983 lastpos = -1; 984 loc = -1; 985 cn = NULL; 986 /* get most specific CN (last entry in list) and compare */ 987 while ((lastpos = X509_NAME_get_index_by_NID(subject, 988 NID_commonName, lastpos)) != -1) 989 loc = lastpos; 990 991 if (loc > -1) { 992 nameentry = X509_NAME_get_entry(subject, loc); 993 namedata = X509_NAME_ENTRY_get_data(nameentry); 994 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 995 if (ip == NULL && 996 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 997 ret = 1; 998 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 999 ret = 1; 1000 OPENSSL_free(cn); 1001 } 1002 return (ret); 1003 } 1004 1005 /* 1006 * Verify that server certificate subjectAltName/CN matches 1007 * hostname. First check, if there are alternative subject names. If yes, 1008 * those have to match. Only if those don't exist it falls back to 1009 * checking the subject's CN. 1010 */ 1011 static int 1012 fetch_ssl_verify_hname(X509 *cert, const char *host) 1013 { 1014 struct addrinfo *ip; 1015 STACK_OF(GENERAL_NAME) *altnames; 1016 X509_NAME *subject; 1017 int ret; 1018 1019 ret = 0; 1020 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 1021 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 1022 NULL, NULL); 1023 1024 if (altnames != NULL) { 1025 ret = fetch_ssl_verify_altname(altnames, host, ip); 1026 } else { 1027 subject = X509_get_subject_name(cert); 1028 if (subject != NULL) 1029 ret = fetch_ssl_verify_cn(subject, host, ip); 1030 } 1031 1032 if (ip != NULL) 1033 freeaddrinfo(ip); 1034 if (altnames != NULL) 1035 GENERAL_NAMES_free(altnames); 1036 return (ret); 1037 } 1038 1039 /* 1040 * Configure transport security layer based on environment. 1041 */ 1042 static void 1043 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 1044 { 1045 long ssl_ctx_options; 1046 1047 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv3 | SSL_OP_NO_TICKET; 1048 if (getenv("SSL_NO_TLS1") != NULL) 1049 ssl_ctx_options |= SSL_OP_NO_TLSv1; 1050 if (getenv("SSL_NO_TLS1_1") != NULL) 1051 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 1052 if (getenv("SSL_NO_TLS1_2") != NULL) 1053 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 1054 if (getenv("SSL_NO_TLS1_3") != NULL) 1055 ssl_ctx_options |= SSL_OP_NO_TLSv1_3; 1056 if (verbose) 1057 fetch_info("SSL options: %lx", ssl_ctx_options); 1058 SSL_CTX_set_options(ctx, ssl_ctx_options); 1059 } 1060 1061 1062 /* 1063 * Configure peer verification based on environment. 1064 */ 1065 static int 1066 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 1067 { 1068 X509_LOOKUP *crl_lookup; 1069 X509_STORE *crl_store; 1070 const char *ca_cert_file, *ca_cert_path, *crl_file; 1071 1072 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 1073 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 1074 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 1075 if (verbose) { 1076 fetch_info("Peer verification enabled"); 1077 if (ca_cert_file != NULL) 1078 fetch_info("Using CA cert file: %s", 1079 ca_cert_file); 1080 if (ca_cert_path != NULL) 1081 fetch_info("Using CA cert path: %s", 1082 ca_cert_path); 1083 if (ca_cert_file == NULL && ca_cert_path == NULL) 1084 fetch_info("Using OpenSSL default " 1085 "CA cert file and path"); 1086 } 1087 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 1088 fetch_ssl_cb_verify_crt); 1089 if (ca_cert_file != NULL || ca_cert_path != NULL) 1090 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 1091 ca_cert_path); 1092 else 1093 SSL_CTX_set_default_verify_paths(ctx); 1094 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 1095 if (verbose) 1096 fetch_info("Using CRL file: %s", crl_file); 1097 crl_store = SSL_CTX_get_cert_store(ctx); 1098 crl_lookup = X509_STORE_add_lookup(crl_store, 1099 X509_LOOKUP_file()); 1100 if (crl_lookup == NULL || 1101 !X509_load_crl_file(crl_lookup, crl_file, 1102 X509_FILETYPE_PEM)) { 1103 fprintf(stderr, 1104 "Could not load CRL file %s\n", 1105 crl_file); 1106 return (0); 1107 } 1108 X509_STORE_set_flags(crl_store, 1109 X509_V_FLAG_CRL_CHECK | 1110 X509_V_FLAG_CRL_CHECK_ALL); 1111 } 1112 } 1113 return (1); 1114 } 1115 1116 /* 1117 * Configure client certificate based on environment. 1118 */ 1119 static int 1120 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 1121 { 1122 const char *client_cert_file, *client_key_file; 1123 1124 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 1125 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 1126 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 1127 if (verbose) { 1128 fetch_info("Using client cert file: %s", 1129 client_cert_file); 1130 fetch_info("Using client key file: %s", 1131 client_key_file); 1132 } 1133 if (SSL_CTX_use_certificate_chain_file(ctx, 1134 client_cert_file) != 1) { 1135 fprintf(stderr, 1136 "Could not load client certificate %s\n", 1137 client_cert_file); 1138 return (0); 1139 } 1140 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 1141 SSL_FILETYPE_PEM) != 1) { 1142 fprintf(stderr, 1143 "Could not load client key %s\n", 1144 client_key_file); 1145 return (0); 1146 } 1147 } 1148 return (1); 1149 } 1150 1151 /* 1152 * Callback for SSL certificate verification, this is called on server 1153 * cert verification. It takes no decision, but informs the user in case 1154 * verification failed. 1155 */ 1156 int 1157 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 1158 { 1159 X509 *crt; 1160 X509_NAME *name; 1161 char *str; 1162 1163 str = NULL; 1164 if (!verified) { 1165 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 1166 (name = X509_get_subject_name(crt)) != NULL) 1167 str = X509_NAME_oneline(name, 0, 0); 1168 fprintf(stderr, "Certificate verification failed for %s\n", 1169 str != NULL ? str : "no relevant certificate"); 1170 OPENSSL_free(str); 1171 } 1172 return (verified); 1173 } 1174 1175 #endif 1176 1177 /* 1178 * Enable SSL on a connection. 1179 */ 1180 int 1181 fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 1182 { 1183 #ifdef WITH_SSL 1184 int ret, ssl_err; 1185 X509_NAME *name; 1186 char *str; 1187 1188 if ((conn->ssl_ctx = SSL_CTX_new(TLS_client_method())) == NULL) { 1189 fprintf(stderr, "SSL context creation failed\n"); 1190 ERR_print_errors_fp(stderr); 1191 return (-1); 1192 } 1193 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 1194 1195 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 1196 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 1197 return (-1); 1198 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 1199 return (-1); 1200 1201 conn->ssl = SSL_new(conn->ssl_ctx); 1202 if (conn->ssl == NULL) { 1203 fprintf(stderr, "SSL connection creation failed\n"); 1204 ERR_print_errors_fp(stderr); 1205 return (-1); 1206 } 1207 SSL_set_fd(conn->ssl, conn->sd); 1208 1209 #if !defined(OPENSSL_NO_TLSEXT) 1210 if (!SSL_set_tlsext_host_name(conn->ssl, 1211 __DECONST(struct url *, URL)->host)) { 1212 fprintf(stderr, 1213 "TLS server name indication extension failed for host %s\n", 1214 URL->host); 1215 return (-1); 1216 } 1217 #endif 1218 while ((ret = SSL_connect(conn->ssl)) == -1) { 1219 ssl_err = SSL_get_error(conn->ssl, ret); 1220 if (ssl_err != SSL_ERROR_WANT_READ && 1221 ssl_err != SSL_ERROR_WANT_WRITE) { 1222 ERR_print_errors_fp(stderr); 1223 return (-1); 1224 } 1225 } 1226 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 1227 1228 if (conn->ssl_cert == NULL) { 1229 fprintf(stderr, "No server SSL certificate\n"); 1230 return (-1); 1231 } 1232 1233 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 1234 if (verbose) 1235 fetch_info("Verify hostname"); 1236 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 1237 fprintf(stderr, 1238 "SSL certificate subject doesn't match host %s\n", 1239 URL->host); 1240 return (-1); 1241 } 1242 } 1243 1244 if (verbose) { 1245 fetch_info("%s connection established using %s", 1246 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 1247 name = X509_get_subject_name(conn->ssl_cert); 1248 str = X509_NAME_oneline(name, 0, 0); 1249 fetch_info("Certificate subject: %s", str); 1250 OPENSSL_free(str); 1251 name = X509_get_issuer_name(conn->ssl_cert); 1252 str = X509_NAME_oneline(name, 0, 0); 1253 fetch_info("Certificate issuer: %s", str); 1254 OPENSSL_free(str); 1255 } 1256 1257 return (0); 1258 #else 1259 (void)conn; 1260 (void)verbose; 1261 (void)URL; 1262 fprintf(stderr, "SSL support disabled\n"); 1263 return (-1); 1264 #endif 1265 } 1266 1267 #define FETCH_READ_WAIT -2 1268 #define FETCH_READ_ERROR -1 1269 #define FETCH_READ_DONE 0 1270 1271 #ifdef WITH_SSL 1272 static ssize_t 1273 fetch_ssl_read(SSL *ssl, char *buf, size_t len) 1274 { 1275 ssize_t rlen; 1276 int ssl_err; 1277 1278 rlen = SSL_read(ssl, buf, len); 1279 if (rlen < 0) { 1280 ssl_err = SSL_get_error(ssl, rlen); 1281 if (ssl_err == SSL_ERROR_WANT_READ || 1282 ssl_err == SSL_ERROR_WANT_WRITE) { 1283 return (FETCH_READ_WAIT); 1284 } else { 1285 ERR_print_errors_fp(stderr); 1286 return (FETCH_READ_ERROR); 1287 } 1288 } 1289 return (rlen); 1290 } 1291 #endif 1292 1293 static ssize_t 1294 fetch_socket_read(int sd, char *buf, size_t len) 1295 { 1296 ssize_t rlen; 1297 1298 rlen = read(sd, buf, len); 1299 if (rlen < 0) { 1300 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) 1301 return (FETCH_READ_WAIT); 1302 else 1303 return (FETCH_READ_ERROR); 1304 } 1305 return (rlen); 1306 } 1307 1308 /* 1309 * Read a character from a connection w/ timeout 1310 */ 1311 ssize_t 1312 fetch_read(conn_t *conn, char *buf, size_t len) 1313 { 1314 struct timeval now, timeout, delta; 1315 struct pollfd pfd; 1316 ssize_t rlen; 1317 int deltams; 1318 1319 if (fetchTimeout > 0) { 1320 gettimeofday(&timeout, NULL); 1321 timeout.tv_sec += fetchTimeout; 1322 } 1323 1324 deltams = INFTIM; 1325 memset(&pfd, 0, sizeof pfd); 1326 pfd.fd = conn->sd; 1327 pfd.events = POLLIN | POLLERR; 1328 1329 for (;;) { 1330 /* 1331 * The socket is non-blocking. Instead of the canonical 1332 * poll() -> read(), we do the following: 1333 * 1334 * 1) call read() or SSL_read(). 1335 * 2) if we received some data, return it. 1336 * 3) if an error occurred, return -1. 1337 * 4) if read() or SSL_read() signaled EOF, return. 1338 * 5) if we did not receive any data but we're not at EOF, 1339 * call poll(). 1340 * 1341 * In the SSL case, this is necessary because if we 1342 * receive a close notification, we have to call 1343 * SSL_read() one additional time after we've read 1344 * everything we received. 1345 * 1346 * In the non-SSL case, it may improve performance (very 1347 * slightly) when reading small amounts of data. 1348 */ 1349 #ifdef WITH_SSL 1350 if (conn->ssl != NULL) 1351 rlen = fetch_ssl_read(conn->ssl, buf, len); 1352 else 1353 #endif 1354 rlen = fetch_socket_read(conn->sd, buf, len); 1355 if (rlen >= 0) { 1356 break; 1357 } else if (rlen == FETCH_READ_ERROR) { 1358 fetch_syserr(); 1359 return (-1); 1360 } 1361 // assert(rlen == FETCH_READ_WAIT); 1362 if (fetchTimeout > 0) { 1363 gettimeofday(&now, NULL); 1364 if (!timercmp(&timeout, &now, >)) { 1365 errno = ETIMEDOUT; 1366 fetch_syserr(); 1367 return (-1); 1368 } 1369 timersub(&timeout, &now, &delta); 1370 deltams = delta.tv_sec * 1000 + 1371 delta.tv_usec / 1000; 1372 } 1373 errno = 0; 1374 pfd.revents = 0; 1375 if (poll(&pfd, 1, deltams) < 0) { 1376 if (errno == EINTR && fetchRestartCalls) 1377 continue; 1378 fetch_syserr(); 1379 return (-1); 1380 } 1381 } 1382 return (rlen); 1383 } 1384 1385 1386 /* 1387 * Read a line of text from a connection w/ timeout 1388 */ 1389 #define MIN_BUF_SIZE 1024 1390 1391 int 1392 fetch_getln(conn_t *conn) 1393 { 1394 char *tmp; 1395 size_t tmpsize; 1396 ssize_t len; 1397 char c; 1398 1399 if (conn->buf == NULL) { 1400 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { 1401 errno = ENOMEM; 1402 return (-1); 1403 } 1404 conn->bufsize = MIN_BUF_SIZE; 1405 } 1406 1407 conn->buf[0] = '\0'; 1408 conn->buflen = 0; 1409 1410 do { 1411 len = fetch_read(conn, &c, 1); 1412 if (len == -1) 1413 return (-1); 1414 if (len == 0) 1415 break; 1416 conn->buf[conn->buflen++] = c; 1417 if (conn->buflen == conn->bufsize) { 1418 tmp = conn->buf; 1419 tmpsize = conn->bufsize * 2 + 1; 1420 if ((tmp = realloc(tmp, tmpsize)) == NULL) { 1421 errno = ENOMEM; 1422 return (-1); 1423 } 1424 conn->buf = tmp; 1425 conn->bufsize = tmpsize; 1426 } 1427 } while (c != '\n'); 1428 1429 conn->buf[conn->buflen] = '\0'; 1430 DEBUGF("<<< %s", conn->buf); 1431 return (0); 1432 } 1433 1434 1435 /* 1436 * Write to a connection w/ timeout 1437 */ 1438 ssize_t 1439 fetch_write(conn_t *conn, const char *buf, size_t len) 1440 { 1441 struct iovec iov; 1442 1443 iov.iov_base = __DECONST(char *, buf); 1444 iov.iov_len = len; 1445 return fetch_writev(conn, &iov, 1); 1446 } 1447 1448 /* 1449 * Write a vector to a connection w/ timeout 1450 * Note: can modify the iovec. 1451 */ 1452 ssize_t 1453 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1454 { 1455 struct timeval now, timeout, delta; 1456 struct pollfd pfd; 1457 ssize_t wlen, total; 1458 int deltams; 1459 1460 memset(&pfd, 0, sizeof pfd); 1461 if (fetchTimeout) { 1462 pfd.fd = conn->sd; 1463 pfd.events = POLLOUT | POLLERR; 1464 gettimeofday(&timeout, NULL); 1465 timeout.tv_sec += fetchTimeout; 1466 } 1467 1468 total = 0; 1469 while (iovcnt > 0) { 1470 while (fetchTimeout && pfd.revents == 0) { 1471 gettimeofday(&now, NULL); 1472 if (!timercmp(&timeout, &now, >)) { 1473 errno = ETIMEDOUT; 1474 fetch_syserr(); 1475 return (-1); 1476 } 1477 timersub(&timeout, &now, &delta); 1478 deltams = delta.tv_sec * 1000 + 1479 delta.tv_usec / 1000; 1480 errno = 0; 1481 pfd.revents = 0; 1482 if (poll(&pfd, 1, deltams) < 0) { 1483 /* POSIX compliance */ 1484 if (errno == EAGAIN) 1485 continue; 1486 if (errno == EINTR && fetchRestartCalls) 1487 continue; 1488 return (-1); 1489 } 1490 } 1491 errno = 0; 1492 #ifdef WITH_SSL 1493 if (conn->ssl != NULL) 1494 wlen = SSL_write(conn->ssl, 1495 iov->iov_base, iov->iov_len); 1496 else 1497 #endif 1498 wlen = writev(conn->sd, iov, iovcnt); 1499 if (wlen == 0) { 1500 /* we consider a short write a failure */ 1501 /* XXX perhaps we shouldn't in the SSL case */ 1502 errno = EPIPE; 1503 fetch_syserr(); 1504 return (-1); 1505 } 1506 if (wlen < 0) { 1507 if (errno == EINTR && fetchRestartCalls) 1508 continue; 1509 return (-1); 1510 } 1511 total += wlen; 1512 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1513 wlen -= iov->iov_len; 1514 iov++; 1515 iovcnt--; 1516 } 1517 if (iovcnt > 0) { 1518 iov->iov_len -= wlen; 1519 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1520 } 1521 } 1522 return (total); 1523 } 1524 1525 1526 /* 1527 * Write a line of text to a connection w/ timeout 1528 */ 1529 int 1530 fetch_putln(conn_t *conn, const char *str, size_t len) 1531 { 1532 struct iovec iov[2]; 1533 int ret; 1534 1535 DEBUGF(">>> %s\n", str); 1536 iov[0].iov_base = __DECONST(char *, str); 1537 iov[0].iov_len = len; 1538 iov[1].iov_base = __DECONST(char *, ENDL); 1539 iov[1].iov_len = sizeof(ENDL); 1540 if (len == 0) 1541 ret = fetch_writev(conn, &iov[1], 1); 1542 else 1543 ret = fetch_writev(conn, iov, 2); 1544 if (ret == -1) 1545 return (-1); 1546 return (0); 1547 } 1548 1549 1550 /* 1551 * Close connection 1552 */ 1553 int 1554 fetch_close(conn_t *conn) 1555 { 1556 int ret; 1557 1558 if (--conn->ref > 0) 1559 return (0); 1560 #ifdef WITH_SSL 1561 if (conn->ssl) { 1562 SSL_shutdown(conn->ssl); 1563 SSL_set_connect_state(conn->ssl); 1564 SSL_free(conn->ssl); 1565 conn->ssl = NULL; 1566 } 1567 if (conn->ssl_ctx) { 1568 SSL_CTX_free(conn->ssl_ctx); 1569 conn->ssl_ctx = NULL; 1570 } 1571 if (conn->ssl_cert) { 1572 X509_free(conn->ssl_cert); 1573 conn->ssl_cert = NULL; 1574 } 1575 #endif 1576 ret = close(conn->sd); 1577 free(conn->buf); 1578 free(conn); 1579 return (ret); 1580 } 1581 1582 1583 /*** Directory-related utility functions *************************************/ 1584 1585 int 1586 fetch_add_entry(struct url_ent **p, int *size, int *len, 1587 const char *name, struct url_stat *us) 1588 { 1589 struct url_ent *tmp; 1590 1591 if (*p == NULL) { 1592 *size = 0; 1593 *len = 0; 1594 } 1595 1596 if (*len >= *size - 1) { 1597 tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p)); 1598 if (tmp == NULL) { 1599 errno = ENOMEM; 1600 fetch_syserr(); 1601 return (-1); 1602 } 1603 *size = (*size * 2 + 1); 1604 *p = tmp; 1605 } 1606 1607 tmp = *p + *len; 1608 snprintf(tmp->name, PATH_MAX, "%s", name); 1609 memcpy(&tmp->stat, us, sizeof(*us)); 1610 1611 (*len)++; 1612 (++tmp)->name[0] = 0; 1613 1614 return (0); 1615 } 1616 1617 1618 /*** Authentication-related utility functions ********************************/ 1619 1620 static const char * 1621 fetch_read_word(FILE *f) 1622 { 1623 static char word[1024]; 1624 1625 if (fscanf(f, " %1023s ", word) != 1) 1626 return (NULL); 1627 return (word); 1628 } 1629 1630 static int 1631 fetch_netrc_open(void) 1632 { 1633 struct passwd *pwd; 1634 char fn[PATH_MAX]; 1635 const char *p; 1636 int fd, serrno; 1637 1638 if ((p = getenv("NETRC")) != NULL) { 1639 DEBUGF("NETRC=%s\n", p); 1640 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1641 fetch_info("$NETRC specifies a file name " 1642 "longer than PATH_MAX"); 1643 return (-1); 1644 } 1645 } else { 1646 if ((p = getenv("HOME")) == NULL) { 1647 if ((pwd = getpwuid(getuid())) == NULL || 1648 (p = pwd->pw_dir) == NULL) 1649 return (-1); 1650 } 1651 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1652 return (-1); 1653 } 1654 1655 if ((fd = open(fn, O_RDONLY)) < 0) { 1656 serrno = errno; 1657 DEBUGF("%s: %s\n", fn, strerror(serrno)); 1658 errno = serrno; 1659 } 1660 return (fd); 1661 } 1662 1663 /* 1664 * Get authentication data for a URL from .netrc 1665 */ 1666 int 1667 fetch_netrc_auth(struct url *url) 1668 { 1669 const char *word; 1670 int serrno; 1671 FILE *f; 1672 1673 if (url->netrcfd < 0) 1674 url->netrcfd = fetch_netrc_open(); 1675 if (url->netrcfd < 0) 1676 return (-1); 1677 if ((f = fdopen(url->netrcfd, "r")) == NULL) { 1678 serrno = errno; 1679 DEBUGF("fdopen(netrcfd): %s", strerror(errno)); 1680 close(url->netrcfd); 1681 url->netrcfd = -1; 1682 errno = serrno; 1683 return (-1); 1684 } 1685 rewind(f); 1686 DEBUGF("searching netrc for %s\n", url->host); 1687 while ((word = fetch_read_word(f)) != NULL) { 1688 if (strcmp(word, "default") == 0) { 1689 DEBUGF("using default netrc settings\n"); 1690 break; 1691 } 1692 if (strcmp(word, "machine") == 0 && 1693 (word = fetch_read_word(f)) != NULL && 1694 strcasecmp(word, url->host) == 0) { 1695 DEBUGF("using netrc settings for %s\n", word); 1696 break; 1697 } 1698 } 1699 if (word == NULL) 1700 goto ferr; 1701 while ((word = fetch_read_word(f)) != NULL) { 1702 if (strcmp(word, "login") == 0) { 1703 if ((word = fetch_read_word(f)) == NULL) 1704 goto ferr; 1705 if (snprintf(url->user, sizeof(url->user), 1706 "%s", word) > (int)sizeof(url->user)) { 1707 fetch_info("login name in .netrc is too long"); 1708 url->user[0] = '\0'; 1709 } 1710 } else if (strcmp(word, "password") == 0) { 1711 if ((word = fetch_read_word(f)) == NULL) 1712 goto ferr; 1713 if (snprintf(url->pwd, sizeof(url->pwd), 1714 "%s", word) > (int)sizeof(url->pwd)) { 1715 fetch_info("password in .netrc is too long"); 1716 url->pwd[0] = '\0'; 1717 } 1718 } else if (strcmp(word, "account") == 0) { 1719 if ((word = fetch_read_word(f)) == NULL) 1720 goto ferr; 1721 /* XXX not supported! */ 1722 } else { 1723 break; 1724 } 1725 } 1726 fclose(f); 1727 url->netrcfd = -1; 1728 return (0); 1729 ferr: 1730 serrno = errno; 1731 fclose(f); 1732 url->netrcfd = -1; 1733 errno = serrno; 1734 return (-1); 1735 } 1736 1737 /* 1738 * The no_proxy environment variable specifies a set of domains for 1739 * which the proxy should not be consulted; the contents is a comma-, 1740 * or space-separated list of domain names. A single asterisk will 1741 * override all proxy variables and no transactions will be proxied 1742 * (for compatibility with lynx and curl, see the discussion at 1743 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1744 */ 1745 int 1746 fetch_no_proxy_match(const char *host) 1747 { 1748 const char *no_proxy, *p, *q; 1749 size_t h_len, d_len; 1750 1751 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1752 (no_proxy = getenv("no_proxy")) == NULL) 1753 return (0); 1754 1755 /* asterisk matches any hostname */ 1756 if (strcmp(no_proxy, "*") == 0) 1757 return (1); 1758 1759 h_len = strlen(host); 1760 p = no_proxy; 1761 do { 1762 /* position p at the beginning of a domain suffix */ 1763 while (*p == ',' || isspace((unsigned char)*p)) 1764 p++; 1765 1766 /* position q at the first separator character */ 1767 for (q = p; *q; ++q) 1768 if (*q == ',' || isspace((unsigned char)*q)) 1769 break; 1770 1771 d_len = q - p; 1772 if (d_len > 0 && h_len >= d_len && 1773 strncasecmp(host + h_len - d_len, 1774 p, d_len) == 0) { 1775 /* domain name matches */ 1776 return (1); 1777 } 1778 1779 p = q + 1; 1780 } while (*q); 1781 1782 return (0); 1783 } 1784