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