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 * Resolve an address 305 */ 306 struct addrinfo * 307 fetch_resolve(const char *addr, int port, int af) 308 { 309 char hbuf[256], sbuf[8]; 310 struct addrinfo hints, *res; 311 const char *hb, *he, *sep; 312 const char *host, *service; 313 int err, len; 314 315 /* first, check for a bracketed IPv6 address */ 316 if (*addr == '[') { 317 hb = addr + 1; 318 if ((sep = strchr(hb, ']')) == NULL) { 319 errno = EINVAL; 320 goto syserr; 321 } 322 he = sep++; 323 } else { 324 hb = addr; 325 sep = strchrnul(hb, ':'); 326 he = sep; 327 } 328 329 /* see if we need to copy the host name */ 330 if (*he != '\0') { 331 len = snprintf(hbuf, sizeof(hbuf), 332 "%.*s", (int)(he - hb), hb); 333 if (len < 0) 334 goto syserr; 335 if (len >= (int)sizeof(hbuf)) { 336 errno = ENAMETOOLONG; 337 goto syserr; 338 } 339 host = hbuf; 340 } else { 341 host = hb; 342 } 343 344 /* was it followed by a service name? */ 345 if (*sep == '\0' && port != 0) { 346 if (port < 1 || port > 65535) { 347 errno = EINVAL; 348 goto syserr; 349 } 350 if (snprintf(sbuf, sizeof(sbuf), "%d", port) < 0) 351 goto syserr; 352 service = sbuf; 353 } else if (*sep != '\0') { 354 service = sep + 1; 355 } else { 356 service = NULL; 357 } 358 359 /* resolve */ 360 memset(&hints, 0, sizeof(hints)); 361 hints.ai_family = af; 362 hints.ai_socktype = SOCK_STREAM; 363 hints.ai_flags = AI_ADDRCONFIG; 364 if ((err = getaddrinfo(host, service, &hints, &res)) != 0) { 365 netdb_seterr(err); 366 return (NULL); 367 } 368 return (res); 369 syserr: 370 fetch_syserr(); 371 return (NULL); 372 } 373 374 375 /* 376 * Bind a socket to a specific local address 377 */ 378 int 379 fetch_bind(int sd, int af, const char *addr) 380 { 381 struct addrinfo *cliai, *ai; 382 int err; 383 384 if ((cliai = fetch_resolve(addr, 0, af)) == NULL) 385 return (-1); 386 for (ai = cliai; ai != NULL; ai = ai->ai_next) 387 if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0) 388 break; 389 if (err != 0) 390 fetch_syserr(); 391 freeaddrinfo(cliai); 392 return (err == 0 ? 0 : -1); 393 } 394 395 396 /* 397 * SOCKS5 connection initiation, based on RFC 1928 398 * Default DNS resolution over SOCKS5 399 */ 400 int 401 fetch_socks5_init(conn_t *conn, const char *host, int port, int verbose) 402 { 403 /* 404 * Size is based on largest packet prefix (4 bytes) + 405 * Largest FQDN (256) + one byte size (1) + 406 * Port (2) 407 */ 408 unsigned char buf[BUFF_SIZE]; 409 unsigned char *ptr; 410 int ret = 1; 411 412 fetch_verbose("Initializing SOCKS5 connection: %s:%d", host, port); 413 414 /* Connection initialization */ 415 ptr = buf; 416 *ptr++ = SOCKS_VERSION_5; 417 *ptr++ = SOCKS_CONNECTION; 418 *ptr++ = SOCKS_RSV; 419 420 if (fetch_write(conn, buf, 3) != 3) { 421 ret = SOCKS5_ERR_SELECTION; 422 goto fail; 423 } 424 425 /* Verify response from SOCKS5 server */ 426 if (fetch_read(conn, buf, 2) != 2) { 427 ret = SOCKS5_ERR_READ_METHOD; 428 goto fail; 429 } 430 431 ptr = buf; 432 if (ptr[0] != SOCKS_VERSION_5) { 433 ret = SOCKS5_ERR_VER5_ONLY; 434 goto fail; 435 } 436 if (ptr[1] == SOCKS_NOMETHODS) { 437 ret = SOCKS5_ERR_NOMETHODS; 438 goto fail; 439 } 440 else if (ptr[1] != SOCKS5_NOTIMPLEMENTED) { 441 ret = SOCKS5_ERR_NOTIMPLEMENTED; 442 goto fail; 443 } 444 445 /* Send Request */ 446 *ptr++ = SOCKS_VERSION_5; 447 *ptr++ = SOCKS_CONNECTION; 448 *ptr++ = SOCKS_RSV; 449 /* Encode all targets as a hostname to avoid DNS leaks */ 450 *ptr++ = SOCKS_ATYP_DOMAINNAME; 451 if (strlen(host) > FQDN_SIZE) { 452 ret = SOCKS5_ERR_HOSTNAME_SIZE; 453 goto fail; 454 } 455 *ptr++ = strlen(host); 456 memcpy(ptr, host, strlen(host)); 457 ptr = ptr + strlen(host); 458 459 port = htons(port); 460 *ptr++ = port & 0x00ff; 461 *ptr++ = (port & 0xff00) >> 8; 462 463 if (fetch_write(conn, buf, ptr - buf) != ptr - buf) { 464 ret = SOCKS5_ERR_REQUEST; 465 goto fail; 466 } 467 468 /* BND.ADDR is variable length, read the largest on non-blocking socket */ 469 if (!fetch_read(conn, buf, BUFF_SIZE)) { 470 ret = SOCKS5_ERR_REPLY; 471 goto fail; 472 } 473 474 ptr = buf; 475 if (*ptr++ != SOCKS_VERSION_5) { 476 ret = SOCKS5_ERR_NON_VER5_RESP; 477 goto fail; 478 } 479 480 switch (*ptr++) { 481 case SOCKS_SUCCESS: 482 break; 483 case SOCKS_GENERAL_FAILURE: 484 ret = SOCKS5_ERR_GENERAL; 485 goto fail; 486 case SOCKS_CONNECTION_NOT_ALLOWED: 487 ret = SOCKS5_ERR_NOT_ALLOWED; 488 goto fail; 489 case SOCKS_NETWORK_UNREACHABLE: 490 ret = SOCKS5_ERR_NET_UNREACHABLE; 491 goto fail; 492 case SOCKS_HOST_UNREACHABLE: 493 ret = SOCKS5_ERR_HOST_UNREACHABLE; 494 goto fail; 495 case SOCKS_CONNECTION_REFUSED: 496 ret = SOCKS5_ERR_CONN_REFUSED; 497 goto fail; 498 case SOCKS_TTL_EXPIRED: 499 ret = SOCKS5_ERR_TTL_EXPIRED; 500 goto fail; 501 case SOCKS_COMMAND_NOT_SUPPORTED: 502 ret = SOCKS5_ERR_COM_UNSUPPORTED; 503 goto fail; 504 case SOCKS_ADDRESS_NOT_SUPPORTED: 505 ret = SOCKS5_ERR_ADDR_UNSUPPORTED; 506 goto fail; 507 default: 508 ret = SOCKS5_ERR_UNSPECIFIED; 509 goto fail; 510 } 511 512 return (ret); 513 514 fail: 515 socks5_seterr(ret); 516 return (0); 517 } 518 519 /* 520 * Perform SOCKS5 initialization 521 */ 522 int 523 fetch_socks5_getenv(char **host, int *port) 524 { 525 char *socks5env, *endptr, *ext; 526 const char *portDelim; 527 size_t slen; 528 529 portDelim = ":"; 530 if ((socks5env = getenv("SOCKS5_PROXY")) == NULL || *socks5env == '\0') { 531 *host = NULL; 532 *port = -1; 533 return (-1); 534 } 535 536 /* 537 * IPv6 addresses begin and end in brackets. Set the port delimiter 538 * accordingly and search for it so we can do appropriate validation. 539 */ 540 if (socks5env[0] == '[') 541 portDelim = "]:"; 542 543 slen = strlen(socks5env); 544 ext = strstr(socks5env, portDelim); 545 if (socks5env[0] == '[') { 546 if (socks5env[slen - 1] == ']') { 547 *host = strndup(socks5env, slen); 548 } else if (ext != NULL) { 549 *host = strndup(socks5env, ext - socks5env + 1); 550 } else { 551 socks5_seterr(SOCKS5_ERR_BAD_PROXY_FORMAT); 552 return (0); 553 } 554 } else { 555 *host = strndup(socks5env, ext - socks5env); 556 } 557 558 if (*host == NULL) 559 return (-1); 560 if (ext == NULL) { 561 *port = 1080; /* Default port as defined in RFC1928 */ 562 } else { 563 ext += strlen(portDelim); 564 errno = 0; 565 *port = strtoimax(ext, (char **)&endptr, 10); 566 if (*endptr != '\0' || errno != 0 || *port < 0 || 567 *port > 65535) { 568 free(*host); 569 *host = NULL; 570 socks5_seterr(SOCKS5_ERR_BAD_PORT); 571 return (0); 572 } 573 } 574 575 return (2); 576 } 577 578 579 /* 580 * Establish a TCP connection to the specified port on the specified host. 581 */ 582 conn_t * 583 fetch_connect(const char *host, int port, int af, int verbose) 584 { 585 struct timeval now, timeout, delta; 586 struct pollfd pfd; 587 struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai; 588 const char *bindaddr; 589 conn_t *conn = NULL; 590 int err = 0, sd = -1; 591 int deltams; 592 char *sockshost; 593 int socksport; 594 595 DEBUGF("---> %s:%d\n", host, port); 596 597 /* 598 * Check if SOCKS5_PROXY env variable is set. fetch_socks5_getenv 599 * will either set sockshost = NULL or allocate memory in all cases. 600 */ 601 sockshost = NULL; 602 if (!fetch_socks5_getenv(&sockshost, &socksport)) 603 goto fail; 604 605 /* Not using SOCKS5 proxy */ 606 if (sockshost == NULL) { 607 /* resolve server address */ 608 fetch_verbose("resolving server address: %s:%d", host, port); 609 if ((sais = fetch_resolve(host, port, af)) == NULL) 610 goto fail; 611 612 /* resolve client address */ 613 bindaddr = getenv("FETCH_BIND_ADDRESS"); 614 if (bindaddr != NULL && *bindaddr != '\0') { 615 fetch_verbose("resolving client address: %s", bindaddr); 616 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL) 617 goto fail; 618 } 619 } else { 620 /* resolve socks5 proxy address */ 621 fetch_verbose("resolving SOCKS5 server address: %s:%d", 622 sockshost, socksport); 623 if ((sais = fetch_resolve(sockshost, socksport, af)) == NULL) { 624 socks5_seterr(SOCKS5_ERR_BAD_HOST); 625 goto fail; 626 } 627 } 628 629 /* try each server address in turn */ 630 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) { 631 /* open socket */ 632 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0) { 633 err = -1; 634 if (errno == EAFNOSUPPORT || errno == EPROTONOSUPPORT) 635 continue; 636 goto syserr; 637 } 638 /* attempt to bind to client address */ 639 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) { 640 if (cai->ai_family != sai->ai_family) 641 continue; 642 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0) 643 break; 644 } 645 if (err != 0) { 646 fetch_verbose("failed to bind to %s", bindaddr); 647 goto syserr; 648 } 649 /* make the socket non-blocking */ 650 (void)fcntl(sd, F_SETFL, O_NONBLOCK); 651 /* start the clock */ 652 if (fetchTimeout > 0) { 653 gettimeofday(&timeout, NULL); 654 timeout.tv_sec += fetchTimeout; 655 deltams = fetchTimeout * 1000; 656 } 657 /* attempt to connect to server address */ 658 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0) 659 break; 660 /* wait for connection */ 661 if (errno == EINPROGRESS) { 662 deltams = INFTIM; 663 pfd.fd = sd; 664 pfd.events = POLLOUT; 665 for (;;) { 666 /* wait for something to happen */ 667 if (poll(&pfd, 1, deltams) >= 0) 668 break; 669 if (errno == EINTR && !fetchRestartCalls) 670 break; 671 /* check the clock */ 672 if (fetchTimeout > 0) { 673 gettimeofday(&now, NULL); 674 if (!timercmp(&timeout, &now, >)) { 675 errno = ETIMEDOUT; 676 pfd.revents = POLLERR; 677 break; 678 } 679 timersub(&timeout, &now, &delta); 680 deltams = delta.tv_sec * 1000 + 681 delta.tv_usec / 1000; 682 } 683 } 684 if (pfd.revents == POLLOUT) { 685 /* connection established */ 686 err = 0; 687 break; 688 } 689 } 690 /* clean up before next attempt */ 691 close(sd); 692 sd = -1; 693 } 694 if (err != 0) { 695 if (verbose && sockshost == NULL) { 696 fetch_info("failed to connect to %s:%d", host, port); 697 goto syserr; 698 } else if (sockshost != NULL) { 699 fetch_verbose("failed to connect to SOCKS5 server %s:%d", 700 sockshost, socksport); 701 socks5_seterr(SOCKS5_ERR_CONN_REFUSED); 702 goto fail; 703 } 704 goto syserr; 705 } 706 707 if ((conn = fetch_reopen(sd)) == NULL) 708 goto syserr; 709 710 if (sockshost) 711 if (!fetch_socks5_init(conn, host, port, verbose)) 712 goto fail; 713 free(sockshost); 714 if (cais != NULL) 715 freeaddrinfo(cais); 716 if (sais != NULL) 717 freeaddrinfo(sais); 718 return (conn); 719 syserr: 720 fetch_syserr(); 721 fail: 722 free(sockshost); 723 /* Fully close if it was opened; otherwise just don't leak the fd. */ 724 if (conn != NULL) 725 fetch_close(conn); 726 else if (sd >= 0) 727 close(sd); 728 if (cais != NULL) 729 freeaddrinfo(cais); 730 if (sais != NULL) 731 freeaddrinfo(sais); 732 return (NULL); 733 } 734 735 #ifdef WITH_SSL 736 /* 737 * Convert characters A-Z to lowercase (intentionally avoid any locale 738 * specific conversions). 739 */ 740 static char 741 fetch_ssl_tolower(char in) 742 { 743 if (in >= 'A' && in <= 'Z') 744 return (in + 32); 745 else 746 return (in); 747 } 748 749 /* 750 * isalpha implementation that intentionally avoids any locale specific 751 * conversions. 752 */ 753 static int 754 fetch_ssl_isalpha(char in) 755 { 756 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 757 } 758 759 /* 760 * Check if passed hostnames a and b are equal. 761 */ 762 static int 763 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 764 size_t blen) 765 { 766 size_t i; 767 768 if (alen != blen) 769 return (0); 770 for (i = 0; i < alen; ++i) { 771 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 772 return (0); 773 } 774 return (1); 775 } 776 777 /* 778 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 779 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 780 * numeric characters. Double hyphens (like they're found in IDN a-labels 781 * 'xn--') are not allowed. Empty labels are invalid. 782 */ 783 static int 784 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 785 { 786 size_t i; 787 788 if (!len || l[0] == '-' || l[len-1] == '-') 789 return (0); 790 for (i = 0; i < len; ++i) { 791 if (!isdigit(l[i]) && 792 !fetch_ssl_isalpha(l[i]) && 793 !(l[i] == '*' && wcok) && 794 !(l[i] == '-' && l[i - 1] != '-')) 795 return (0); 796 } 797 return (1); 798 } 799 800 /* 801 * Check if host name consists only of numbers. This might indicate an IP 802 * address, which is not a good idea for CN wildcard comparison. 803 */ 804 static int 805 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 806 { 807 size_t i; 808 809 for (i = 0; i < len; ++i) { 810 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 811 hostname[i] == '.')) 812 return (0); 813 } 814 return (1); 815 } 816 817 /* 818 * Check if the host name h passed matches the pattern passed in m which 819 * is usually part of subjectAltName or CN of a certificate presented to 820 * the client. This includes wildcard matching. The algorithm is based on 821 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 822 */ 823 static int 824 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 825 size_t mlen) 826 { 827 int delta, hdotidx, mdot1idx, wcidx; 828 const char *hdot, *mdot1, *mdot2; 829 const char *wc; /* wildcard */ 830 831 if (!(h && *h && m && *m)) 832 return (0); 833 if ((wc = strnstr(m, "*", mlen)) == NULL) 834 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 835 wcidx = wc - m; 836 /* hostname should not be just dots and numbers */ 837 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 838 return (0); 839 /* only one wildcard allowed in pattern */ 840 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 841 return (0); 842 /* 843 * there must be at least two more domain labels and 844 * wildcard has to be in the leftmost label (RFC6125) 845 */ 846 mdot1 = strnstr(m, ".", mlen); 847 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 848 return (0); 849 mdot1idx = mdot1 - m; 850 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 851 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 852 return (0); 853 /* hostname must contain a dot and not be the 1st char */ 854 hdot = strnstr(h, ".", hlen); 855 if (hdot == NULL || hdot == h) 856 return (0); 857 hdotidx = hdot - h; 858 /* 859 * host part of hostname must be at least as long as 860 * pattern it's supposed to match 861 */ 862 if (hdotidx < mdot1idx) 863 return (0); 864 /* 865 * don't allow wildcards in non-traditional domain names 866 * (IDN, A-label, U-label...) 867 */ 868 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 869 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 870 return (0); 871 /* match domain part (part after first dot) */ 872 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 873 mlen - mdot1idx)) 874 return (0); 875 /* match part left of wildcard */ 876 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 877 return (0); 878 /* match part right of wildcard */ 879 delta = mdot1idx - wcidx - 1; 880 if (!fetch_ssl_hname_equal(hdot - delta, delta, 881 mdot1 - delta, delta)) 882 return (0); 883 /* all tests succeeded, it's a match */ 884 return (1); 885 } 886 887 /* 888 * Get numeric host address info - returns NULL if host was not an IP 889 * address. The caller is responsible for deallocation using 890 * freeaddrinfo(3). 891 */ 892 static struct addrinfo * 893 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 894 { 895 struct addrinfo hints, *res; 896 char *host; 897 898 host = (char *)malloc(len + 1); 899 memcpy(host, hostname, len); 900 host[len] = '\0'; 901 memset(&hints, 0, sizeof(hints)); 902 hints.ai_family = PF_UNSPEC; 903 hints.ai_socktype = SOCK_STREAM; 904 hints.ai_protocol = 0; 905 hints.ai_flags = AI_NUMERICHOST; 906 /* port is not relevant for this purpose */ 907 if (getaddrinfo(host, "443", &hints, &res) != 0) 908 res = NULL; 909 free(host); 910 return res; 911 } 912 913 /* 914 * Compare ip address in addrinfo with address passes. 915 */ 916 static int 917 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 918 size_t rhostlen) 919 { 920 const void *left; 921 922 if (lhost->ai_family == AF_INET && rhostlen == 4) { 923 left = (void *)&((struct sockaddr_in*)(void *) 924 lhost->ai_addr)->sin_addr.s_addr; 925 #ifdef INET6 926 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 927 left = (void *)&((struct sockaddr_in6 *)(void *) 928 lhost->ai_addr)->sin6_addr; 929 #endif 930 } else 931 return (0); 932 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 933 } 934 935 /* 936 * Compare ip address in addrinfo with host passed. If host is not an IP 937 * address, comparison will fail. 938 */ 939 static int 940 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 941 size_t rlen) 942 { 943 struct addrinfo *raddr; 944 int ret; 945 char *rip; 946 947 ret = 0; 948 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 949 return 0; /* not a numeric host */ 950 951 if (laddr->ai_family == raddr->ai_family) { 952 if (laddr->ai_family == AF_INET) { 953 rip = (char *)&((struct sockaddr_in *)(void *) 954 raddr->ai_addr)->sin_addr.s_addr; 955 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 956 #ifdef INET6 957 } else if (laddr->ai_family == AF_INET6) { 958 rip = (char *)&((struct sockaddr_in6 *)(void *) 959 raddr->ai_addr)->sin6_addr; 960 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 961 #endif 962 } 963 964 } 965 freeaddrinfo(raddr); 966 return (ret); 967 } 968 969 /* 970 * Verify server certificate by subjectAltName. 971 */ 972 static int 973 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 974 const char *host, struct addrinfo *ip) 975 { 976 const GENERAL_NAME *name; 977 size_t nslen; 978 int i; 979 const char *ns; 980 981 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 982 name = sk_GENERAL_NAME_value(altnames, i); 983 ns = (const char *)ASN1_STRING_get0_data(name->d.ia5); 984 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 985 986 if (name->type == GEN_DNS && ip == NULL && 987 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 988 return (1); 989 else if (name->type == GEN_IPADD && ip != NULL && 990 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 991 return (1); 992 } 993 return (0); 994 } 995 996 /* 997 * Verify server certificate by CN. 998 */ 999 static int 1000 fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 1001 struct addrinfo *ip) 1002 { 1003 ASN1_STRING *namedata; 1004 X509_NAME_ENTRY *nameentry; 1005 int cnlen, lastpos, loc, ret; 1006 unsigned char *cn; 1007 1008 ret = 0; 1009 lastpos = -1; 1010 loc = -1; 1011 cn = NULL; 1012 /* get most specific CN (last entry in list) and compare */ 1013 while ((lastpos = X509_NAME_get_index_by_NID(subject, 1014 NID_commonName, lastpos)) != -1) 1015 loc = lastpos; 1016 1017 if (loc > -1) { 1018 nameentry = X509_NAME_get_entry(subject, loc); 1019 namedata = X509_NAME_ENTRY_get_data(nameentry); 1020 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 1021 if (ip == NULL && 1022 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 1023 ret = 1; 1024 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 1025 ret = 1; 1026 OPENSSL_free(cn); 1027 } 1028 return (ret); 1029 } 1030 1031 /* 1032 * Verify that server certificate subjectAltName/CN matches 1033 * hostname. First check, if there are alternative subject names. If yes, 1034 * those have to match. Only if those don't exist it falls back to 1035 * checking the subject's CN. 1036 */ 1037 static int 1038 fetch_ssl_verify_hname(X509 *cert, const char *host) 1039 { 1040 struct addrinfo *ip; 1041 STACK_OF(GENERAL_NAME) *altnames; 1042 X509_NAME *subject; 1043 int ret; 1044 1045 ret = 0; 1046 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 1047 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 1048 NULL, NULL); 1049 1050 if (altnames != NULL) { 1051 ret = fetch_ssl_verify_altname(altnames, host, ip); 1052 } else { 1053 subject = X509_get_subject_name(cert); 1054 if (subject != NULL) 1055 ret = fetch_ssl_verify_cn(subject, host, ip); 1056 } 1057 1058 if (ip != NULL) 1059 freeaddrinfo(ip); 1060 if (altnames != NULL) 1061 GENERAL_NAMES_free(altnames); 1062 return (ret); 1063 } 1064 1065 /* 1066 * Configure transport security layer based on environment. 1067 */ 1068 static void 1069 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 1070 { 1071 long ssl_ctx_options; 1072 1073 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv3 | SSL_OP_NO_TICKET; 1074 if (getenv("SSL_NO_TLS1") != NULL) 1075 ssl_ctx_options |= SSL_OP_NO_TLSv1; 1076 if (getenv("SSL_NO_TLS1_1") != NULL) 1077 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 1078 if (getenv("SSL_NO_TLS1_2") != NULL) 1079 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 1080 if (getenv("SSL_NO_TLS1_3") != NULL) 1081 ssl_ctx_options |= SSL_OP_NO_TLSv1_3; 1082 fetch_verbose("SSL options: %lx", ssl_ctx_options); 1083 SSL_CTX_set_options(ctx, ssl_ctx_options); 1084 } 1085 1086 1087 /* 1088 * Configure peer verification based on environment. 1089 */ 1090 static int 1091 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 1092 { 1093 X509_LOOKUP *crl_lookup; 1094 X509_STORE *crl_store; 1095 const char *ca_cert_file, *ca_cert_path, *crl_file; 1096 1097 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 1098 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 1099 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 1100 if (verbose) { 1101 fetch_info("Peer verification enabled"); 1102 if (ca_cert_file != NULL) 1103 fetch_info("Using CA cert file: %s", 1104 ca_cert_file); 1105 if (ca_cert_path != NULL) 1106 fetch_info("Using CA cert path: %s", 1107 ca_cert_path); 1108 if (ca_cert_file == NULL && ca_cert_path == NULL) 1109 fetch_info("Using OpenSSL default " 1110 "CA cert file and path"); 1111 } 1112 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 1113 fetch_ssl_cb_verify_crt); 1114 if (ca_cert_file != NULL || ca_cert_path != NULL) 1115 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 1116 ca_cert_path); 1117 else 1118 SSL_CTX_set_default_verify_paths(ctx); 1119 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 1120 fetch_verbose("Using CRL file: %s", crl_file); 1121 crl_store = SSL_CTX_get_cert_store(ctx); 1122 crl_lookup = X509_STORE_add_lookup(crl_store, 1123 X509_LOOKUP_file()); 1124 if (crl_lookup == NULL || 1125 !X509_load_crl_file(crl_lookup, crl_file, 1126 X509_FILETYPE_PEM)) { 1127 fetch_info("Could not load CRL file %s", 1128 crl_file); 1129 return (0); 1130 } 1131 X509_STORE_set_flags(crl_store, 1132 X509_V_FLAG_CRL_CHECK | 1133 X509_V_FLAG_CRL_CHECK_ALL); 1134 } 1135 } 1136 return (1); 1137 } 1138 1139 /* 1140 * Configure client certificate based on environment. 1141 */ 1142 static int 1143 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 1144 { 1145 const char *client_cert_file, *client_key_file; 1146 1147 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 1148 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 1149 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 1150 fetch_verbose("Using client cert file: %s", client_cert_file); 1151 fetch_verbose("Using client key file: %s", client_key_file); 1152 if (SSL_CTX_use_certificate_chain_file(ctx, 1153 client_cert_file) != 1) { 1154 fetch_info("Could not load client certificate %s", 1155 client_cert_file); 1156 return (0); 1157 } 1158 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 1159 SSL_FILETYPE_PEM) != 1) { 1160 fetch_info("Could not load client key %s", 1161 client_key_file); 1162 return (0); 1163 } 1164 } 1165 return (1); 1166 } 1167 1168 /* 1169 * Callback for SSL certificate verification, this is called on server 1170 * cert verification. It takes no decision, but informs the user in case 1171 * verification failed. 1172 */ 1173 int 1174 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 1175 { 1176 X509 *crt; 1177 X509_NAME *name; 1178 char *str; 1179 1180 str = NULL; 1181 if (!verified) { 1182 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 1183 (name = X509_get_subject_name(crt)) != NULL) 1184 str = X509_NAME_oneline(name, 0, 0); 1185 fetch_info("Certificate verification failed for %s", 1186 str != NULL ? str : "no relevant certificate"); 1187 OPENSSL_free(str); 1188 } 1189 return (verified); 1190 } 1191 1192 #endif 1193 1194 /* 1195 * Enable SSL on a connection. 1196 */ 1197 int 1198 fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 1199 { 1200 #ifdef WITH_SSL 1201 int ret, ssl_err; 1202 X509_NAME *name; 1203 char *str; 1204 1205 if ((conn->ssl_ctx = SSL_CTX_new(TLS_client_method())) == NULL) { 1206 fetch_info("SSL context creation failed"); 1207 ERR_print_errors_fp(stderr); 1208 return (-1); 1209 } 1210 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 1211 1212 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 1213 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 1214 return (-1); 1215 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 1216 return (-1); 1217 1218 conn->ssl = SSL_new(conn->ssl_ctx); 1219 if (conn->ssl == NULL) { 1220 fetch_info("SSL connection creation failed"); 1221 ERR_print_errors_fp(stderr); 1222 return (-1); 1223 } 1224 SSL_set_fd(conn->ssl, conn->sd); 1225 1226 #if !defined(OPENSSL_NO_TLSEXT) 1227 if (!SSL_set_tlsext_host_name(conn->ssl, __DECONST(char *, URL->host))) { 1228 fetch_info("Failed to set TLS server name indication for host %s", 1229 URL->host); 1230 return (-1); 1231 } 1232 #endif 1233 while ((ret = SSL_connect(conn->ssl)) == -1) { 1234 ssl_err = SSL_get_error(conn->ssl, ret); 1235 if (ssl_err != SSL_ERROR_WANT_READ && 1236 ssl_err != SSL_ERROR_WANT_WRITE) { 1237 ERR_print_errors_fp(stderr); 1238 return (-1); 1239 } 1240 } 1241 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 1242 1243 if (conn->ssl_cert == NULL) { 1244 fetch_info("No server SSL certificate"); 1245 return (-1); 1246 } 1247 1248 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 1249 fetch_verbose("Verify hostname"); 1250 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 1251 fetch_info("SSL certificate subject does not match host %s", 1252 URL->host); 1253 return (-1); 1254 } 1255 } 1256 1257 if (verbose) { 1258 fetch_info("%s connection established using %s", 1259 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 1260 name = X509_get_subject_name(conn->ssl_cert); 1261 str = X509_NAME_oneline(name, 0, 0); 1262 fetch_info("Certificate subject: %s", str); 1263 OPENSSL_free(str); 1264 name = X509_get_issuer_name(conn->ssl_cert); 1265 str = X509_NAME_oneline(name, 0, 0); 1266 fetch_info("Certificate issuer: %s", str); 1267 OPENSSL_free(str); 1268 } 1269 1270 return (0); 1271 #else 1272 (void)conn; 1273 (void)verbose; 1274 (void)URL; 1275 fetch_info("SSL support disabled"); 1276 return (-1); 1277 #endif 1278 } 1279 1280 #ifdef WITH_SSL 1281 static ssize_t 1282 fetch_ssl_read(SSL *ssl, void *buf, size_t len) 1283 { 1284 ssize_t rlen; 1285 int ssl_err; 1286 1287 rlen = SSL_read(ssl, buf, len); 1288 if (rlen < 0) { 1289 ssl_err = SSL_get_error(ssl, rlen); 1290 switch (ssl_err) { 1291 case SSL_ERROR_ZERO_RETURN: 1292 return (0); 1293 case SSL_ERROR_WANT_READ: 1294 errno = EAGAIN; 1295 return (-1); 1296 case SSL_ERROR_SYSCALL: 1297 return (-1); 1298 default: 1299 errno = EPROTO; 1300 return (-1); 1301 } 1302 } 1303 return (rlen); 1304 } 1305 1306 static ssize_t 1307 fetch_ssl_write(SSL *ssl, void *buf, size_t len) 1308 { 1309 ssize_t wlen; 1310 int ssl_err; 1311 1312 wlen = SSL_write(ssl, buf, len); 1313 if (wlen < 0) { 1314 ssl_err = SSL_get_error(ssl, wlen); 1315 switch (ssl_err) { 1316 case SSL_ERROR_ZERO_RETURN: 1317 return (0); 1318 case SSL_ERROR_WANT_WRITE: 1319 errno = EAGAIN; 1320 return (-1); 1321 case SSL_ERROR_SYSCALL: 1322 return (-1); 1323 default: 1324 errno = EPROTO; 1325 return (-1); 1326 } 1327 } 1328 return (wlen); 1329 } 1330 #endif 1331 1332 /* 1333 * Read from a connection w/ timeout 1334 */ 1335 ssize_t 1336 fetch_read(conn_t *conn, void *buf, size_t len) 1337 { 1338 struct timeval now, timeout, delta; 1339 struct pollfd pfd; 1340 ssize_t rlen, total; 1341 int deltams; 1342 1343 if (fetchTimeout > 0) { 1344 gettimeofday(&timeout, NULL); 1345 timeout.tv_sec += fetchTimeout; 1346 } 1347 1348 deltams = INFTIM; 1349 pfd.fd = conn->sd; 1350 pfd.events = POLLIN; 1351 1352 total = 0; 1353 for (;;) { 1354 /* 1355 * The socket is non-blocking. Instead of the canonical 1356 * poll() -> read(), we do the following: 1357 * 1358 * 1) call read() or SSL_read(). 1359 * 2) if we received some data, return it. 1360 * 3) if read() or SSL_read() signaled EOF, return. 1361 * 4) if an error occurred, return -1. 1362 * 5) if we did not receive any data but we're not at EOF, 1363 * call poll(). 1364 * 1365 * In the SSL case, this is necessary because if we 1366 * receive a close notification, we have to call 1367 * SSL_read() one additional time after we've read 1368 * everything we received. 1369 * 1370 * In the non-SSL case, it may improve performance (very 1371 * slightly) when reading small amounts of data. 1372 */ 1373 #ifdef WITH_SSL 1374 if (conn->ssl != NULL) 1375 rlen = fetch_ssl_read(conn->ssl, buf, len); 1376 else 1377 #endif 1378 rlen = read(conn->sd, buf, len); 1379 if (rlen > 0) { 1380 /* something was read */ 1381 total += rlen; 1382 len -= rlen; 1383 if (len == 0) 1384 break; 1385 /* a partial read is success */ 1386 break; 1387 } else if (rlen == 0) { 1388 /* connection closed */ 1389 break; 1390 } else if (errno != EAGAIN) { 1391 /* error */ 1392 if (errno == EINTR && fetchRestartCalls) 1393 continue; 1394 fetch_syserr(); 1395 break; 1396 } 1397 /* check what's left of our timeout */ 1398 if (fetchTimeout > 0) { 1399 gettimeofday(&now, NULL); 1400 if (!timercmp(&timeout, &now, >)) { 1401 errno = ETIMEDOUT; 1402 fetch_syserr(); 1403 return (-1); 1404 } 1405 timersub(&timeout, &now, &delta); 1406 deltams = delta.tv_sec * 1000 + 1407 delta.tv_usec / 1000; 1408 } 1409 /* wait for the socket to become readable */ 1410 if (poll(&pfd, 1, deltams) < 0) { 1411 if (errno == EAGAIN) 1412 continue; 1413 if (errno == EINTR && fetchRestartCalls) 1414 continue; 1415 break; 1416 } 1417 } 1418 /* a partial read is success */ 1419 if (rlen < 0 && total == 0) 1420 return (-1); 1421 return (total); 1422 } 1423 1424 1425 /* 1426 * Read a line of text from a connection w/ timeout 1427 */ 1428 #define MIN_BUF_SIZE 1024 1429 1430 ssize_t 1431 fetch_getln(conn_t *conn) 1432 { 1433 char *tmp; 1434 size_t tmpsize; 1435 ssize_t rlen; 1436 1437 /* allocate initial buffer */ 1438 if (conn->buf == NULL) { 1439 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) 1440 return (-1); 1441 conn->bufsize = MIN_BUF_SIZE; 1442 conn->buflen = 0; 1443 conn->pos = 0; 1444 } 1445 1446 /* move residual data up */ 1447 if (conn->buflen > 0) { 1448 if (conn->pos < conn->buflen) { 1449 memmove(conn->buf, conn->buf + conn->pos, 1450 conn->buflen - conn->pos); 1451 } 1452 conn->buflen -= conn->pos; 1453 conn->pos -= conn->pos; 1454 } 1455 1456 /* do we have a complete line? */ 1457 while (conn->pos < conn->buflen) 1458 if (conn->buf[conn->pos++] == '\n') 1459 goto found; 1460 1461 for (;;) { 1462 /* read as much as we can right now */ 1463 rlen = fetch_read(conn, conn->buf + conn->buflen, 1464 conn->bufsize - conn->buflen - 1); 1465 /* error */ 1466 if (rlen < 0) 1467 return (-1); 1468 /* advance and terminate */ 1469 conn->buflen += rlen; 1470 conn->buf[conn->buflen] = '\0'; 1471 /* connection closed */ 1472 if (rlen == 0) 1473 break; 1474 /* look for a newline */ 1475 while (conn->pos < conn->buflen) 1476 if (conn->buf[conn->pos++] == '\n') 1477 goto found; 1478 /* do we need a bigger buffer? */ 1479 if (conn->buflen > conn->bufsize / 2) { 1480 tmp = conn->buf; 1481 tmpsize = conn->bufsize * 2; 1482 if ((tmp = realloc(tmp, tmpsize)) == NULL) 1483 return (-1); 1484 conn->buf = tmp; 1485 conn->bufsize = tmpsize; 1486 } 1487 } 1488 /* connection closed, return what's left */ 1489 conn->pos = conn->buflen; 1490 found: 1491 rlen = conn->pos; 1492 if (rlen > 0 && conn->buf[rlen - 1] == '\n') 1493 conn->buf[--rlen] = '\0'; 1494 if (rlen > 0 && conn->buf[rlen - 1] == '\r') 1495 conn->buf[--rlen] = '\0'; 1496 DEBUGF("<<< %.*s\n", (int)rlen, conn->buf); 1497 return (rlen); 1498 } 1499 1500 1501 /* 1502 * Read from a connection, taking previously buffered data into account. 1503 */ 1504 ssize_t 1505 fetch_bufread(conn_t *conn, void *buf, size_t len) 1506 { 1507 ssize_t rlen; 1508 1509 /* avoid overflow */ 1510 if (len > SSIZE_MAX) 1511 len = SSIZE_MAX; 1512 1513 /* allocate initial buffer */ 1514 if (conn->buf == NULL) { 1515 conn->bufsize = MIN_BUF_SIZE; 1516 while (conn->bufsize < len) 1517 conn->bufsize *= 2; 1518 if ((conn->buf = malloc(conn->bufsize)) == NULL) 1519 return (-1); 1520 conn->buflen = 0; 1521 conn->pos = 0; 1522 } 1523 1524 /* return residual data first */ 1525 if (conn->buflen > conn->pos) { 1526 if (len > conn->buflen - conn->pos) 1527 rlen = conn->buflen - conn->pos; 1528 else 1529 rlen = len; 1530 memcpy(buf, conn->buf + conn->pos, rlen); 1531 conn->pos += rlen; 1532 return (rlen); 1533 } 1534 1535 return (fetch_read(conn, buf, len)); 1536 } 1537 1538 1539 /* 1540 * Write to a connection w/ timeout 1541 */ 1542 ssize_t 1543 fetch_write(conn_t *conn, const void *buf, size_t len) 1544 { 1545 struct iovec iov; 1546 1547 iov.iov_base = __DECONST(char *, buf); 1548 iov.iov_len = len; 1549 return (fetch_writev(conn, &iov, 1)); 1550 } 1551 1552 /* 1553 * Write a vector to a connection w/ timeout 1554 * Note: can modify the iovec. 1555 */ 1556 ssize_t 1557 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1558 { 1559 struct timeval now, timeout, delta; 1560 struct pollfd pfd; 1561 ssize_t wlen, total; 1562 int deltams; 1563 1564 if (fetchTimeout > 0) { 1565 gettimeofday(&timeout, NULL); 1566 timeout.tv_sec += fetchTimeout; 1567 } 1568 1569 deltams = INFTIM; 1570 pfd.fd = conn->sd; 1571 pfd.events = POLLOUT; 1572 1573 total = 0; 1574 for (;;) { 1575 /* 1576 * The socket is non-blocking. Instead of the canonical 1577 * poll() -> write(), we do the following: 1578 * 1579 * 1) call write() or SSL_write(). 1580 * 2) if we wrote everything, return success. 1581 * 3) if write() or SSL_write() signaled EOF before we 1582 * wrote everything, return -1. 1583 * 4) if an error occurred, return -1. 1584 * 5) if we did not write everything but we're not at EOF, 1585 * call poll(). 1586 */ 1587 #ifdef WITH_SSL 1588 if (conn->ssl != NULL) { 1589 wlen = fetch_ssl_write(conn->ssl, 1590 iov->iov_base, iov->iov_len); 1591 } else 1592 #endif 1593 wlen = writev(conn->sd, iov, iovcnt); 1594 if (wlen > 0) { 1595 /* something was written */ 1596 total += wlen; 1597 /* skip iovs which were completely written */ 1598 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1599 wlen -= iov->iov_len; 1600 iov++; 1601 iovcnt--; 1602 } 1603 /* are we done? */ 1604 if (iovcnt == 0) 1605 break; 1606 /* skip written portion of current iov */ 1607 iov->iov_len -= wlen; 1608 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1609 /* a partial write is incomplete */ 1610 continue; 1611 } else if (wlen == 0) { 1612 /* connection closed */ 1613 break; 1614 } else if (errno != EAGAIN) { 1615 /* error */ 1616 if (errno == EINTR && fetchRestartCalls) 1617 continue; 1618 fetch_syserr(); 1619 break; 1620 } 1621 /* check what's left of our timeout */ 1622 if (fetchTimeout > 0) { 1623 gettimeofday(&now, NULL); 1624 if (!timercmp(&timeout, &now, >)) { 1625 errno = ETIMEDOUT; 1626 fetch_syserr(); 1627 return (-1); 1628 } 1629 timersub(&timeout, &now, &delta); 1630 deltams = delta.tv_sec * 1000 + 1631 delta.tv_usec / 1000; 1632 } 1633 /* wait for the socket to become writeable */ 1634 if (poll(&pfd, 1, deltams) < 0) { 1635 if (errno == EAGAIN) 1636 continue; 1637 if (errno == EINTR && fetchRestartCalls) 1638 continue; 1639 return (-1); 1640 } 1641 } 1642 /* a partial write is failure */ 1643 if (iovcnt > 0) 1644 return (-1); 1645 return (total); 1646 } 1647 1648 1649 /* 1650 * Write a line of text to a connection w/ timeout 1651 */ 1652 int 1653 fetch_putln(conn_t *conn, const char *str, size_t len) 1654 { 1655 struct iovec iov[2]; 1656 int ret; 1657 1658 DEBUGF(">>> %s\n", str); 1659 iov[0].iov_base = __DECONST(char *, str); 1660 iov[0].iov_len = len; 1661 iov[1].iov_base = __DECONST(char *, ENDL); 1662 iov[1].iov_len = sizeof(ENDL); 1663 if (len == 0) 1664 ret = fetch_writev(conn, &iov[1], 1); 1665 else 1666 ret = fetch_writev(conn, iov, 2); 1667 if (ret == -1) 1668 return (-1); 1669 return (0); 1670 } 1671 1672 1673 /* 1674 * Close connection 1675 */ 1676 int 1677 fetch_close(conn_t *conn) 1678 { 1679 int ret; 1680 1681 if (--conn->ref > 0) 1682 return (0); 1683 #ifdef WITH_SSL 1684 if (conn->ssl) { 1685 SSL_shutdown(conn->ssl); 1686 SSL_set_connect_state(conn->ssl); 1687 SSL_free(conn->ssl); 1688 conn->ssl = NULL; 1689 } 1690 if (conn->ssl_ctx) { 1691 SSL_CTX_free(conn->ssl_ctx); 1692 conn->ssl_ctx = NULL; 1693 } 1694 if (conn->ssl_cert) { 1695 X509_free(conn->ssl_cert); 1696 conn->ssl_cert = NULL; 1697 } 1698 #endif 1699 ret = close(conn->sd); 1700 free(conn->buf); 1701 free(conn); 1702 return (ret); 1703 } 1704 1705 1706 /*** Directory-related utility functions *************************************/ 1707 1708 int 1709 fetch_add_entry(struct url_ent **p, int *size, int *len, 1710 const char *name, struct url_stat *us) 1711 { 1712 struct url_ent *tmp; 1713 1714 if (*p == NULL) { 1715 *size = 0; 1716 *len = 0; 1717 } 1718 1719 if (*len >= *size - 1) { 1720 tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p)); 1721 if (tmp == NULL) { 1722 errno = ENOMEM; 1723 fetch_syserr(); 1724 return (-1); 1725 } 1726 *size = (*size * 2 + 1); 1727 *p = tmp; 1728 } 1729 1730 tmp = *p + *len; 1731 snprintf(tmp->name, PATH_MAX, "%s", name); 1732 memcpy(&tmp->stat, us, sizeof(*us)); 1733 1734 (*len)++; 1735 (++tmp)->name[0] = 0; 1736 1737 return (0); 1738 } 1739 1740 1741 /*** Authentication-related utility functions ********************************/ 1742 1743 static const char * 1744 fetch_read_word(FILE *f) 1745 { 1746 static char word[1024]; 1747 1748 if (fscanf(f, " %1023s ", word) != 1) 1749 return (NULL); 1750 return (word); 1751 } 1752 1753 static int 1754 fetch_netrc_open(void) 1755 { 1756 struct passwd *pwd; 1757 char fn[PATH_MAX]; 1758 const char *p; 1759 int fd, serrno; 1760 1761 if ((p = getenv("NETRC")) != NULL) { 1762 DEBUGF("NETRC=%s\n", p); 1763 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1764 fetch_info("$NETRC specifies a file name " 1765 "longer than PATH_MAX"); 1766 return (-1); 1767 } 1768 } else { 1769 if ((p = getenv("HOME")) == NULL) { 1770 if ((pwd = getpwuid(getuid())) == NULL || 1771 (p = pwd->pw_dir) == NULL) 1772 return (-1); 1773 } 1774 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1775 return (-1); 1776 } 1777 1778 if ((fd = open(fn, O_RDONLY)) < 0) { 1779 serrno = errno; 1780 DEBUGF("%s: %s\n", fn, strerror(serrno)); 1781 errno = serrno; 1782 } 1783 return (fd); 1784 } 1785 1786 /* 1787 * Get authentication data for a URL from .netrc 1788 */ 1789 int 1790 fetch_netrc_auth(struct url *url) 1791 { 1792 const char *word; 1793 int serrno; 1794 FILE *f; 1795 1796 if (url->netrcfd < 0) 1797 url->netrcfd = fetch_netrc_open(); 1798 if (url->netrcfd < 0) 1799 return (-1); 1800 if ((f = fdopen(url->netrcfd, "r")) == NULL) { 1801 serrno = errno; 1802 DEBUGF("fdopen(netrcfd): %s", strerror(errno)); 1803 close(url->netrcfd); 1804 url->netrcfd = -1; 1805 errno = serrno; 1806 return (-1); 1807 } 1808 rewind(f); 1809 DEBUGF("searching netrc for %s\n", url->host); 1810 while ((word = fetch_read_word(f)) != NULL) { 1811 if (strcmp(word, "default") == 0) { 1812 DEBUGF("using default netrc settings\n"); 1813 break; 1814 } 1815 if (strcmp(word, "machine") == 0 && 1816 (word = fetch_read_word(f)) != NULL && 1817 strcasecmp(word, url->host) == 0) { 1818 DEBUGF("using netrc settings for %s\n", word); 1819 break; 1820 } 1821 } 1822 if (word == NULL) 1823 goto ferr; 1824 while ((word = fetch_read_word(f)) != NULL) { 1825 if (strcmp(word, "login") == 0) { 1826 if ((word = fetch_read_word(f)) == NULL) 1827 goto ferr; 1828 if (snprintf(url->user, sizeof(url->user), 1829 "%s", word) > (int)sizeof(url->user)) { 1830 fetch_info("login name in .netrc is too long"); 1831 url->user[0] = '\0'; 1832 } 1833 } else if (strcmp(word, "password") == 0) { 1834 if ((word = fetch_read_word(f)) == NULL) 1835 goto ferr; 1836 if (snprintf(url->pwd, sizeof(url->pwd), 1837 "%s", word) > (int)sizeof(url->pwd)) { 1838 fetch_info("password in .netrc is too long"); 1839 url->pwd[0] = '\0'; 1840 } 1841 } else if (strcmp(word, "account") == 0) { 1842 if ((word = fetch_read_word(f)) == NULL) 1843 goto ferr; 1844 /* XXX not supported! */ 1845 } else { 1846 break; 1847 } 1848 } 1849 fclose(f); 1850 url->netrcfd = -1; 1851 return (0); 1852 ferr: 1853 serrno = errno; 1854 fclose(f); 1855 url->netrcfd = -1; 1856 errno = serrno; 1857 return (-1); 1858 } 1859 1860 /* 1861 * The no_proxy environment variable specifies a set of domains for 1862 * which the proxy should not be consulted; the contents is a comma-, 1863 * or space-separated list of domain names. A single asterisk will 1864 * override all proxy variables and no transactions will be proxied 1865 * (for compatibility with lynx and curl, see the discussion at 1866 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1867 */ 1868 int 1869 fetch_no_proxy_match(const char *host) 1870 { 1871 const char *no_proxy, *p, *q; 1872 size_t h_len, d_len; 1873 1874 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1875 (no_proxy = getenv("no_proxy")) == NULL) 1876 return (0); 1877 1878 /* asterisk matches any hostname */ 1879 if (strcmp(no_proxy, "*") == 0) 1880 return (1); 1881 1882 h_len = strlen(host); 1883 p = no_proxy; 1884 do { 1885 /* position p at the beginning of a domain suffix */ 1886 while (*p == ',' || isspace((unsigned char)*p)) 1887 p++; 1888 1889 /* position q at the first separator character */ 1890 for (q = p; *q; ++q) 1891 if (*q == ',' || isspace((unsigned char)*q)) 1892 break; 1893 1894 d_len = q - p; 1895 if (d_len > 0 && h_len >= d_len && 1896 strncasecmp(host + h_len - d_len, 1897 p, d_len) == 0) { 1898 /* domain name matches */ 1899 return (1); 1900 } 1901 1902 p = q + 1; 1903 } while (*q); 1904 1905 return (0); 1906 } 1907