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 & POLLHUP) { 685 errno = ECONNREFUSED; 686 break; 687 } 688 if (pfd.revents == POLLOUT) { 689 /* connection established */ 690 err = 0; 691 break; 692 } 693 } 694 /* clean up before next attempt */ 695 close(sd); 696 sd = -1; 697 } 698 if (err != 0) { 699 if (verbose && sockshost == NULL) { 700 fetch_info("failed to connect to %s:%d", host, port); 701 goto syserr; 702 } else if (sockshost != NULL) { 703 fetch_verbose("failed to connect to SOCKS5 server %s:%d", 704 sockshost, socksport); 705 socks5_seterr(SOCKS5_ERR_CONN_REFUSED); 706 goto fail; 707 } 708 goto syserr; 709 } 710 711 if ((conn = fetch_reopen(sd)) == NULL) 712 goto syserr; 713 714 if (sockshost) 715 if (!fetch_socks5_init(conn, host, port, verbose)) 716 goto fail; 717 free(sockshost); 718 if (cais != NULL) 719 freeaddrinfo(cais); 720 if (sais != NULL) 721 freeaddrinfo(sais); 722 return (conn); 723 syserr: 724 fetch_syserr(); 725 fail: 726 free(sockshost); 727 /* Fully close if it was opened; otherwise just don't leak the fd. */ 728 if (conn != NULL) 729 fetch_close(conn); 730 else if (sd >= 0) 731 close(sd); 732 if (cais != NULL) 733 freeaddrinfo(cais); 734 if (sais != NULL) 735 freeaddrinfo(sais); 736 return (NULL); 737 } 738 739 #ifdef WITH_SSL 740 /* 741 * Convert characters A-Z to lowercase (intentionally avoid any locale 742 * specific conversions). 743 */ 744 static char 745 fetch_ssl_tolower(char in) 746 { 747 if (in >= 'A' && in <= 'Z') 748 return (in + 32); 749 else 750 return (in); 751 } 752 753 /* 754 * isalpha implementation that intentionally avoids any locale specific 755 * conversions. 756 */ 757 static int 758 fetch_ssl_isalpha(char in) 759 { 760 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 761 } 762 763 /* 764 * Check if passed hostnames a and b are equal. 765 */ 766 static int 767 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 768 size_t blen) 769 { 770 size_t i; 771 772 if (alen != blen) 773 return (0); 774 for (i = 0; i < alen; ++i) { 775 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 776 return (0); 777 } 778 return (1); 779 } 780 781 /* 782 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 783 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 784 * numeric characters. Double hyphens (like they're found in IDN a-labels 785 * 'xn--') are not allowed. Empty labels are invalid. 786 */ 787 static int 788 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 789 { 790 size_t i; 791 792 if (!len || l[0] == '-' || l[len-1] == '-') 793 return (0); 794 for (i = 0; i < len; ++i) { 795 if (!isdigit(l[i]) && 796 !fetch_ssl_isalpha(l[i]) && 797 !(l[i] == '*' && wcok) && 798 !(l[i] == '-' && l[i - 1] != '-')) 799 return (0); 800 } 801 return (1); 802 } 803 804 /* 805 * Check if host name consists only of numbers. This might indicate an IP 806 * address, which is not a good idea for CN wildcard comparison. 807 */ 808 static int 809 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 810 { 811 size_t i; 812 813 for (i = 0; i < len; ++i) { 814 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 815 hostname[i] == '.')) 816 return (0); 817 } 818 return (1); 819 } 820 821 /* 822 * Check if the host name h passed matches the pattern passed in m which 823 * is usually part of subjectAltName or CN of a certificate presented to 824 * the client. This includes wildcard matching. The algorithm is based on 825 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 826 */ 827 static int 828 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 829 size_t mlen) 830 { 831 int delta, hdotidx, mdot1idx, wcidx; 832 const char *hdot, *mdot1, *mdot2; 833 const char *wc; /* wildcard */ 834 835 if (!(h && *h && m && *m)) 836 return (0); 837 if ((wc = strnstr(m, "*", mlen)) == NULL) 838 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 839 wcidx = wc - m; 840 /* hostname should not be just dots and numbers */ 841 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 842 return (0); 843 /* only one wildcard allowed in pattern */ 844 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 845 return (0); 846 /* 847 * there must be at least two more domain labels and 848 * wildcard has to be in the leftmost label (RFC6125) 849 */ 850 mdot1 = strnstr(m, ".", mlen); 851 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 852 return (0); 853 mdot1idx = mdot1 - m; 854 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 855 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 856 return (0); 857 /* hostname must contain a dot and not be the 1st char */ 858 hdot = strnstr(h, ".", hlen); 859 if (hdot == NULL || hdot == h) 860 return (0); 861 hdotidx = hdot - h; 862 /* 863 * host part of hostname must be at least as long as 864 * pattern it's supposed to match 865 */ 866 if (hdotidx < mdot1idx) 867 return (0); 868 /* 869 * don't allow wildcards in non-traditional domain names 870 * (IDN, A-label, U-label...) 871 */ 872 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 873 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 874 return (0); 875 /* match domain part (part after first dot) */ 876 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 877 mlen - mdot1idx)) 878 return (0); 879 /* match part left of wildcard */ 880 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 881 return (0); 882 /* match part right of wildcard */ 883 delta = mdot1idx - wcidx - 1; 884 if (!fetch_ssl_hname_equal(hdot - delta, delta, 885 mdot1 - delta, delta)) 886 return (0); 887 /* all tests succeeded, it's a match */ 888 return (1); 889 } 890 891 /* 892 * Get numeric host address info - returns NULL if host was not an IP 893 * address. The caller is responsible for deallocation using 894 * freeaddrinfo(3). 895 */ 896 static struct addrinfo * 897 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 898 { 899 struct addrinfo hints, *res; 900 char *host; 901 902 host = (char *)malloc(len + 1); 903 memcpy(host, hostname, len); 904 host[len] = '\0'; 905 memset(&hints, 0, sizeof(hints)); 906 hints.ai_family = PF_UNSPEC; 907 hints.ai_socktype = SOCK_STREAM; 908 hints.ai_protocol = 0; 909 hints.ai_flags = AI_NUMERICHOST; 910 /* port is not relevant for this purpose */ 911 if (getaddrinfo(host, "443", &hints, &res) != 0) 912 res = NULL; 913 free(host); 914 return res; 915 } 916 917 /* 918 * Compare ip address in addrinfo with address passes. 919 */ 920 static int 921 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 922 size_t rhostlen) 923 { 924 const void *left; 925 926 if (lhost->ai_family == AF_INET && rhostlen == 4) { 927 left = (void *)&((struct sockaddr_in*)(void *) 928 lhost->ai_addr)->sin_addr.s_addr; 929 #ifdef INET6 930 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 931 left = (void *)&((struct sockaddr_in6 *)(void *) 932 lhost->ai_addr)->sin6_addr; 933 #endif 934 } else 935 return (0); 936 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 937 } 938 939 /* 940 * Compare ip address in addrinfo with host passed. If host is not an IP 941 * address, comparison will fail. 942 */ 943 static int 944 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 945 size_t rlen) 946 { 947 struct addrinfo *raddr; 948 int ret; 949 char *rip; 950 951 ret = 0; 952 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 953 return 0; /* not a numeric host */ 954 955 if (laddr->ai_family == raddr->ai_family) { 956 if (laddr->ai_family == AF_INET) { 957 rip = (char *)&((struct sockaddr_in *)(void *) 958 raddr->ai_addr)->sin_addr.s_addr; 959 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 960 #ifdef INET6 961 } else if (laddr->ai_family == AF_INET6) { 962 rip = (char *)&((struct sockaddr_in6 *)(void *) 963 raddr->ai_addr)->sin6_addr; 964 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 965 #endif 966 } 967 968 } 969 freeaddrinfo(raddr); 970 return (ret); 971 } 972 973 /* 974 * Verify server certificate by subjectAltName. 975 */ 976 static int 977 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 978 const char *host, struct addrinfo *ip) 979 { 980 const GENERAL_NAME *name; 981 size_t nslen; 982 int i; 983 const char *ns; 984 985 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 986 name = sk_GENERAL_NAME_value(altnames, i); 987 ns = (const char *)ASN1_STRING_get0_data(name->d.ia5); 988 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 989 990 if (name->type == GEN_DNS && ip == NULL && 991 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 992 return (1); 993 else if (name->type == GEN_IPADD && ip != NULL && 994 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 995 return (1); 996 } 997 return (0); 998 } 999 1000 /* 1001 * Verify server certificate by CN. 1002 */ 1003 static int 1004 fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 1005 struct addrinfo *ip) 1006 { 1007 ASN1_STRING *namedata; 1008 X509_NAME_ENTRY *nameentry; 1009 int cnlen, lastpos, loc, ret; 1010 unsigned char *cn; 1011 1012 ret = 0; 1013 lastpos = -1; 1014 loc = -1; 1015 cn = NULL; 1016 /* get most specific CN (last entry in list) and compare */ 1017 while ((lastpos = X509_NAME_get_index_by_NID(subject, 1018 NID_commonName, lastpos)) != -1) 1019 loc = lastpos; 1020 1021 if (loc > -1) { 1022 nameentry = X509_NAME_get_entry(subject, loc); 1023 namedata = X509_NAME_ENTRY_get_data(nameentry); 1024 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 1025 if (ip == NULL && 1026 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 1027 ret = 1; 1028 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 1029 ret = 1; 1030 OPENSSL_free(cn); 1031 } 1032 return (ret); 1033 } 1034 1035 /* 1036 * Verify that server certificate subjectAltName/CN matches 1037 * hostname. First check, if there are alternative subject names. If yes, 1038 * those have to match. Only if those don't exist it falls back to 1039 * checking the subject's CN. 1040 */ 1041 static int 1042 fetch_ssl_verify_hname(X509 *cert, const char *host) 1043 { 1044 struct addrinfo *ip; 1045 STACK_OF(GENERAL_NAME) *altnames; 1046 X509_NAME *subject; 1047 int ret; 1048 1049 ret = 0; 1050 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 1051 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 1052 NULL, NULL); 1053 1054 if (altnames != NULL) { 1055 ret = fetch_ssl_verify_altname(altnames, host, ip); 1056 } else { 1057 subject = X509_get_subject_name(cert); 1058 if (subject != NULL) 1059 ret = fetch_ssl_verify_cn(subject, host, ip); 1060 } 1061 1062 if (ip != NULL) 1063 freeaddrinfo(ip); 1064 if (altnames != NULL) 1065 GENERAL_NAMES_free(altnames); 1066 return (ret); 1067 } 1068 1069 /* 1070 * Configure transport security layer based on environment. 1071 */ 1072 static void 1073 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 1074 { 1075 long ssl_ctx_options; 1076 1077 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv3 | SSL_OP_NO_TICKET; 1078 if (getenv("SSL_NO_TLS1") != NULL) 1079 ssl_ctx_options |= SSL_OP_NO_TLSv1; 1080 if (getenv("SSL_NO_TLS1_1") != NULL) 1081 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 1082 if (getenv("SSL_NO_TLS1_2") != NULL) 1083 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 1084 if (getenv("SSL_NO_TLS1_3") != NULL) 1085 ssl_ctx_options |= SSL_OP_NO_TLSv1_3; 1086 fetch_verbose("SSL options: %lx", ssl_ctx_options); 1087 SSL_CTX_set_options(ctx, ssl_ctx_options); 1088 } 1089 1090 1091 /* 1092 * Configure peer verification based on environment. 1093 */ 1094 static int 1095 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 1096 { 1097 X509_LOOKUP *crl_lookup; 1098 X509_STORE *crl_store; 1099 const char *ca_cert_file, *ca_cert_path, *crl_file; 1100 1101 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 1102 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 1103 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 1104 if (verbose) { 1105 fetch_info("Peer verification enabled"); 1106 if (ca_cert_file != NULL) 1107 fetch_info("Using CA cert file: %s", 1108 ca_cert_file); 1109 if (ca_cert_path != NULL) 1110 fetch_info("Using CA cert path: %s", 1111 ca_cert_path); 1112 if (ca_cert_file == NULL && ca_cert_path == NULL) 1113 fetch_info("Using OpenSSL default " 1114 "CA cert file and path"); 1115 } 1116 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 1117 fetch_ssl_cb_verify_crt); 1118 if (ca_cert_file != NULL || ca_cert_path != NULL) 1119 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 1120 ca_cert_path); 1121 else 1122 SSL_CTX_set_default_verify_paths(ctx); 1123 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 1124 fetch_verbose("Using CRL file: %s", crl_file); 1125 crl_store = SSL_CTX_get_cert_store(ctx); 1126 crl_lookup = X509_STORE_add_lookup(crl_store, 1127 X509_LOOKUP_file()); 1128 if (crl_lookup == NULL || 1129 !X509_load_crl_file(crl_lookup, crl_file, 1130 X509_FILETYPE_PEM)) { 1131 fetch_info("Could not load CRL file %s", 1132 crl_file); 1133 return (0); 1134 } 1135 X509_STORE_set_flags(crl_store, 1136 X509_V_FLAG_CRL_CHECK | 1137 X509_V_FLAG_CRL_CHECK_ALL); 1138 } 1139 } 1140 return (1); 1141 } 1142 1143 /* 1144 * Configure client certificate based on environment. 1145 */ 1146 static int 1147 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 1148 { 1149 const char *client_cert_file, *client_key_file; 1150 1151 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 1152 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 1153 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 1154 fetch_verbose("Using client cert file: %s", client_cert_file); 1155 fetch_verbose("Using client key file: %s", client_key_file); 1156 if (SSL_CTX_use_certificate_chain_file(ctx, 1157 client_cert_file) != 1) { 1158 fetch_info("Could not load client certificate %s", 1159 client_cert_file); 1160 return (0); 1161 } 1162 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 1163 SSL_FILETYPE_PEM) != 1) { 1164 fetch_info("Could not load client key %s", 1165 client_key_file); 1166 return (0); 1167 } 1168 } 1169 return (1); 1170 } 1171 1172 /* 1173 * Callback for SSL certificate verification, this is called on server 1174 * cert verification. It takes no decision, but informs the user in case 1175 * verification failed. 1176 */ 1177 int 1178 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 1179 { 1180 X509 *crt; 1181 X509_NAME *name; 1182 char *str; 1183 1184 str = NULL; 1185 if (!verified) { 1186 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 1187 (name = X509_get_subject_name(crt)) != NULL) 1188 str = X509_NAME_oneline(name, 0, 0); 1189 fetch_info("Certificate verification failed for %s", 1190 str != NULL ? str : "no relevant certificate"); 1191 OPENSSL_free(str); 1192 } 1193 return (verified); 1194 } 1195 1196 #endif 1197 1198 /* 1199 * Enable SSL on a connection. 1200 */ 1201 int 1202 fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 1203 { 1204 #ifdef WITH_SSL 1205 int ret, ssl_err; 1206 X509_NAME *name; 1207 char *str; 1208 1209 if ((conn->ssl_ctx = SSL_CTX_new(TLS_client_method())) == NULL) { 1210 fetch_info("SSL context creation failed"); 1211 ERR_print_errors_fp(stderr); 1212 return (-1); 1213 } 1214 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 1215 1216 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 1217 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 1218 return (-1); 1219 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 1220 return (-1); 1221 1222 conn->ssl = SSL_new(conn->ssl_ctx); 1223 if (conn->ssl == NULL) { 1224 fetch_info("SSL connection creation failed"); 1225 ERR_print_errors_fp(stderr); 1226 return (-1); 1227 } 1228 SSL_set_fd(conn->ssl, conn->sd); 1229 1230 #if !defined(OPENSSL_NO_TLSEXT) 1231 if (!SSL_set_tlsext_host_name(conn->ssl, __DECONST(char *, URL->host))) { 1232 fetch_info("Failed to set TLS server name indication for host %s", 1233 URL->host); 1234 return (-1); 1235 } 1236 #endif 1237 while ((ret = SSL_connect(conn->ssl)) == -1) { 1238 ssl_err = SSL_get_error(conn->ssl, ret); 1239 if (ssl_err != SSL_ERROR_WANT_READ && 1240 ssl_err != SSL_ERROR_WANT_WRITE) { 1241 ERR_print_errors_fp(stderr); 1242 return (-1); 1243 } 1244 } 1245 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 1246 1247 if (conn->ssl_cert == NULL) { 1248 fetch_info("No server SSL certificate"); 1249 return (-1); 1250 } 1251 1252 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 1253 fetch_verbose("Verify hostname"); 1254 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 1255 fetch_info("SSL certificate subject does not match host %s", 1256 URL->host); 1257 return (-1); 1258 } 1259 } 1260 1261 if (verbose) { 1262 fetch_info("%s connection established using %s", 1263 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 1264 name = X509_get_subject_name(conn->ssl_cert); 1265 str = X509_NAME_oneline(name, 0, 0); 1266 fetch_info("Certificate subject: %s", str); 1267 OPENSSL_free(str); 1268 name = X509_get_issuer_name(conn->ssl_cert); 1269 str = X509_NAME_oneline(name, 0, 0); 1270 fetch_info("Certificate issuer: %s", str); 1271 OPENSSL_free(str); 1272 } 1273 1274 return (0); 1275 #else 1276 (void)conn; 1277 (void)verbose; 1278 (void)URL; 1279 fetch_info("SSL support disabled"); 1280 return (-1); 1281 #endif 1282 } 1283 1284 #ifdef WITH_SSL 1285 static ssize_t 1286 fetch_ssl_read(SSL *ssl, void *buf, size_t len) 1287 { 1288 ssize_t rlen; 1289 int ssl_err; 1290 1291 rlen = SSL_read(ssl, buf, len); 1292 if (rlen < 0) { 1293 ssl_err = SSL_get_error(ssl, rlen); 1294 switch (ssl_err) { 1295 case SSL_ERROR_ZERO_RETURN: 1296 return (0); 1297 case SSL_ERROR_WANT_READ: 1298 errno = EAGAIN; 1299 return (-1); 1300 case SSL_ERROR_SYSCALL: 1301 return (-1); 1302 default: 1303 errno = EPROTO; 1304 return (-1); 1305 } 1306 } 1307 return (rlen); 1308 } 1309 1310 static ssize_t 1311 fetch_ssl_write(SSL *ssl, void *buf, size_t len) 1312 { 1313 ssize_t wlen; 1314 int ssl_err; 1315 1316 wlen = SSL_write(ssl, buf, len); 1317 if (wlen < 0) { 1318 ssl_err = SSL_get_error(ssl, wlen); 1319 switch (ssl_err) { 1320 case SSL_ERROR_ZERO_RETURN: 1321 return (0); 1322 case SSL_ERROR_WANT_WRITE: 1323 errno = EAGAIN; 1324 return (-1); 1325 case SSL_ERROR_SYSCALL: 1326 return (-1); 1327 default: 1328 errno = EPROTO; 1329 return (-1); 1330 } 1331 } 1332 return (wlen); 1333 } 1334 #endif 1335 1336 /* 1337 * Read from a connection w/ timeout 1338 */ 1339 ssize_t 1340 fetch_read(conn_t *conn, void *buf, size_t len) 1341 { 1342 struct timeval now, timeout, delta; 1343 struct pollfd pfd; 1344 ssize_t rlen, total; 1345 int deltams; 1346 1347 if (fetchTimeout > 0) { 1348 gettimeofday(&timeout, NULL); 1349 timeout.tv_sec += fetchTimeout; 1350 } 1351 1352 deltams = INFTIM; 1353 pfd.fd = conn->sd; 1354 pfd.events = POLLIN; 1355 1356 total = 0; 1357 for (;;) { 1358 /* 1359 * The socket is non-blocking. Instead of the canonical 1360 * poll() -> read(), we do the following: 1361 * 1362 * 1) call read() or SSL_read(). 1363 * 2) if we received some data, return it. 1364 * 3) if read() or SSL_read() signaled EOF, return. 1365 * 4) if an error occurred, return -1. 1366 * 5) if we did not receive any data but we're not at EOF, 1367 * call poll(). 1368 * 1369 * In the SSL case, this is necessary because if we 1370 * receive a close notification, we have to call 1371 * SSL_read() one additional time after we've read 1372 * everything we received. 1373 * 1374 * In the non-SSL case, it may improve performance (very 1375 * slightly) when reading small amounts of data. 1376 */ 1377 #ifdef WITH_SSL 1378 if (conn->ssl != NULL) 1379 rlen = fetch_ssl_read(conn->ssl, buf, len); 1380 else 1381 #endif 1382 rlen = read(conn->sd, buf, len); 1383 if (rlen > 0) { 1384 /* something was read */ 1385 total += rlen; 1386 len -= rlen; 1387 if (len == 0) 1388 break; 1389 /* a partial read is success */ 1390 break; 1391 } else if (rlen == 0) { 1392 /* connection closed */ 1393 break; 1394 } else if (errno != EAGAIN) { 1395 /* error */ 1396 if (errno == EINTR && fetchRestartCalls) 1397 continue; 1398 fetch_syserr(); 1399 break; 1400 } 1401 /* check what's left of our timeout */ 1402 if (fetchTimeout > 0) { 1403 gettimeofday(&now, NULL); 1404 if (!timercmp(&timeout, &now, >)) { 1405 errno = ETIMEDOUT; 1406 fetch_syserr(); 1407 return (-1); 1408 } 1409 timersub(&timeout, &now, &delta); 1410 deltams = delta.tv_sec * 1000 + 1411 delta.tv_usec / 1000; 1412 } 1413 /* wait for the socket to become readable */ 1414 if (poll(&pfd, 1, deltams) < 0) { 1415 if (errno == EAGAIN) 1416 continue; 1417 if (errno == EINTR && fetchRestartCalls) 1418 continue; 1419 break; 1420 } 1421 } 1422 /* a partial read is success */ 1423 if (rlen < 0 && total == 0) 1424 return (-1); 1425 return (total); 1426 } 1427 1428 1429 /* 1430 * Read a line of text from a connection w/ timeout 1431 */ 1432 #define MIN_BUF_SIZE 1024 1433 1434 ssize_t 1435 fetch_getln(conn_t *conn) 1436 { 1437 char *tmp; 1438 size_t tmpsize; 1439 ssize_t rlen; 1440 1441 /* allocate initial buffer */ 1442 if (conn->buf == NULL) { 1443 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) 1444 goto fail; 1445 conn->line = conn->buf; 1446 conn->bufsize = MIN_BUF_SIZE; 1447 conn->buflen = 0; 1448 conn->pos = 0; 1449 } 1450 1451 /* look at the data we already have */ 1452 if (conn->pos < conn->buflen) { 1453 conn->line = conn->buf + conn->pos; 1454 while (conn->pos < conn->buflen) 1455 if (conn->buf[conn->pos++] == '\n') 1456 goto found; 1457 /* reset for the upcoming memmove() */ 1458 conn->pos = conn->line - conn->buf; 1459 } 1460 1461 /* move residual data up */ 1462 if (conn->buflen > 0) { 1463 if (conn->pos < conn->buflen) { 1464 memmove(conn->buf, conn->buf + conn->pos, 1465 conn->buflen - conn->pos); 1466 } 1467 conn->buflen -= conn->pos; 1468 conn->pos -= conn->pos; 1469 conn->line = conn->buf; 1470 } 1471 1472 for (;;) { 1473 /* read as much as we can right now */ 1474 rlen = fetch_read(conn, conn->buf + conn->buflen, 1475 conn->bufsize - conn->buflen - 1); 1476 /* error */ 1477 if (rlen < 0) 1478 goto fail; 1479 /* advance and terminate */ 1480 conn->buflen += rlen; 1481 conn->buf[conn->buflen] = '\0'; 1482 /* connection closed */ 1483 if (rlen == 0) 1484 break; 1485 /* look for a newline */ 1486 while (conn->pos < conn->buflen) 1487 if (conn->buf[conn->pos++] == '\n') 1488 goto found; 1489 /* do we need a bigger buffer? */ 1490 if (conn->buflen > conn->bufsize / 2) { 1491 tmp = conn->buf; 1492 tmpsize = conn->bufsize * 2; 1493 if ((tmp = realloc(tmp, tmpsize)) == NULL) 1494 goto fail; 1495 conn->line = conn->buf = tmp; 1496 conn->bufsize = tmpsize; 1497 } 1498 } 1499 /* connection closed, return what's left */ 1500 conn->pos = conn->buflen; 1501 found: 1502 conn->linelen = (conn->buf + conn->pos) - conn->line; 1503 if (conn->linelen > 0 && conn->line[conn->linelen - 1] == '\n') 1504 conn->line[--conn->linelen] = '\0'; 1505 if (conn->linelen > 0 && conn->line[conn->linelen - 1] == '\r') 1506 conn->line[--conn->linelen] = '\0'; 1507 DEBUGF("<<< %.*s\n", (int)conn->linelen, conn->line); 1508 return (conn->linelen); 1509 fail: 1510 conn->line = NULL; 1511 conn->linelen = 0; 1512 return (-1); 1513 } 1514 1515 1516 /* 1517 * Read from a connection, taking previously buffered data into account. 1518 */ 1519 ssize_t 1520 fetch_bufread(conn_t *conn, void *buf, size_t len) 1521 { 1522 ssize_t rlen; 1523 1524 /* avoid overflow */ 1525 if (len > SSIZE_MAX) 1526 len = SSIZE_MAX; 1527 1528 /* allocate initial buffer */ 1529 if (conn->buf == NULL) { 1530 conn->bufsize = MIN_BUF_SIZE; 1531 while (conn->bufsize < len) 1532 conn->bufsize *= 2; 1533 if ((conn->buf = malloc(conn->bufsize)) == NULL) 1534 return (-1); 1535 conn->buflen = 0; 1536 conn->pos = 0; 1537 } 1538 conn->line = NULL; 1539 conn->linelen = 0; 1540 1541 /* return residual data first */ 1542 if (conn->buflen > conn->pos) { 1543 if (len > conn->buflen - conn->pos) 1544 rlen = conn->buflen - conn->pos; 1545 else 1546 rlen = len; 1547 memcpy(buf, conn->buf + conn->pos, rlen); 1548 conn->pos += rlen; 1549 return (rlen); 1550 } 1551 1552 return (fetch_read(conn, buf, len)); 1553 } 1554 1555 1556 /* 1557 * Write to a connection w/ timeout 1558 */ 1559 ssize_t 1560 fetch_write(conn_t *conn, const void *buf, size_t len) 1561 { 1562 struct iovec iov; 1563 1564 iov.iov_base = __DECONST(char *, buf); 1565 iov.iov_len = len; 1566 return (fetch_writev(conn, &iov, 1)); 1567 } 1568 1569 /* 1570 * Write a vector to a connection w/ timeout 1571 * Note: can modify the iovec. 1572 */ 1573 ssize_t 1574 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1575 { 1576 struct timeval now, timeout, delta; 1577 struct pollfd pfd; 1578 ssize_t wlen, total; 1579 int deltams; 1580 1581 if (fetchTimeout > 0) { 1582 gettimeofday(&timeout, NULL); 1583 timeout.tv_sec += fetchTimeout; 1584 } 1585 1586 deltams = INFTIM; 1587 pfd.fd = conn->sd; 1588 pfd.events = POLLOUT; 1589 1590 total = 0; 1591 for (;;) { 1592 /* 1593 * The socket is non-blocking. Instead of the canonical 1594 * poll() -> write(), we do the following: 1595 * 1596 * 1) call write() or SSL_write(). 1597 * 2) if we wrote everything, return success. 1598 * 3) if write() or SSL_write() signaled EOF before we 1599 * wrote everything, return -1. 1600 * 4) if an error occurred, return -1. 1601 * 5) if we did not write everything but we're not at EOF, 1602 * call poll(). 1603 */ 1604 #ifdef WITH_SSL 1605 if (conn->ssl != NULL) { 1606 wlen = fetch_ssl_write(conn->ssl, 1607 iov->iov_base, iov->iov_len); 1608 } else 1609 #endif 1610 wlen = writev(conn->sd, iov, iovcnt); 1611 if (wlen > 0) { 1612 /* something was written */ 1613 total += wlen; 1614 /* skip iovs which were completely written */ 1615 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1616 wlen -= iov->iov_len; 1617 iov++; 1618 iovcnt--; 1619 } 1620 /* are we done? */ 1621 if (iovcnt == 0) 1622 break; 1623 /* skip written portion of current iov */ 1624 iov->iov_len -= wlen; 1625 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1626 /* a partial write is incomplete */ 1627 continue; 1628 } else if (wlen == 0) { 1629 /* connection closed */ 1630 break; 1631 } else if (errno != EAGAIN) { 1632 /* error */ 1633 if (errno == EINTR && fetchRestartCalls) 1634 continue; 1635 fetch_syserr(); 1636 break; 1637 } 1638 /* check what's left of our timeout */ 1639 if (fetchTimeout > 0) { 1640 gettimeofday(&now, NULL); 1641 if (!timercmp(&timeout, &now, >)) { 1642 errno = ETIMEDOUT; 1643 fetch_syserr(); 1644 return (-1); 1645 } 1646 timersub(&timeout, &now, &delta); 1647 deltams = delta.tv_sec * 1000 + 1648 delta.tv_usec / 1000; 1649 } 1650 /* wait for the socket to become writeable */ 1651 if (poll(&pfd, 1, deltams) < 0) { 1652 if (errno == EAGAIN) 1653 continue; 1654 if (errno == EINTR && fetchRestartCalls) 1655 continue; 1656 return (-1); 1657 } 1658 } 1659 /* a partial write is failure */ 1660 if (iovcnt > 0) 1661 return (-1); 1662 return (total); 1663 } 1664 1665 1666 /* 1667 * Write a line of text to a connection w/ timeout 1668 */ 1669 int 1670 fetch_putln(conn_t *conn, const char *str, size_t len) 1671 { 1672 struct iovec iov[2]; 1673 int ret; 1674 1675 DEBUGF(">>> %s\n", str); 1676 iov[0].iov_base = __DECONST(char *, str); 1677 iov[0].iov_len = len; 1678 iov[1].iov_base = __DECONST(char *, ENDL); 1679 iov[1].iov_len = sizeof(ENDL); 1680 if (len == 0) 1681 ret = fetch_writev(conn, &iov[1], 1); 1682 else 1683 ret = fetch_writev(conn, iov, 2); 1684 if (ret == -1) 1685 return (-1); 1686 return (0); 1687 } 1688 1689 1690 /* 1691 * Close connection 1692 */ 1693 int 1694 fetch_close(conn_t *conn) 1695 { 1696 int ret; 1697 1698 if (--conn->ref > 0) 1699 return (0); 1700 #ifdef WITH_SSL 1701 if (conn->ssl) { 1702 SSL_shutdown(conn->ssl); 1703 SSL_set_connect_state(conn->ssl); 1704 SSL_free(conn->ssl); 1705 conn->ssl = NULL; 1706 } 1707 if (conn->ssl_ctx) { 1708 SSL_CTX_free(conn->ssl_ctx); 1709 conn->ssl_ctx = NULL; 1710 } 1711 if (conn->ssl_cert) { 1712 X509_free(conn->ssl_cert); 1713 conn->ssl_cert = NULL; 1714 } 1715 #endif 1716 ret = close(conn->sd); 1717 free(conn->buf); 1718 free(conn); 1719 return (ret); 1720 } 1721 1722 1723 /*** Directory-related utility functions *************************************/ 1724 1725 int 1726 fetch_add_entry(struct url_ent **p, int *size, int *len, 1727 const char *name, struct url_stat *us) 1728 { 1729 struct url_ent *tmp; 1730 1731 if (*p == NULL) { 1732 *size = 0; 1733 *len = 0; 1734 } 1735 1736 if (*len >= *size - 1) { 1737 tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p)); 1738 if (tmp == NULL) { 1739 errno = ENOMEM; 1740 fetch_syserr(); 1741 return (-1); 1742 } 1743 *size = (*size * 2 + 1); 1744 *p = tmp; 1745 } 1746 1747 tmp = *p + *len; 1748 snprintf(tmp->name, PATH_MAX, "%s", name); 1749 memcpy(&tmp->stat, us, sizeof(*us)); 1750 1751 (*len)++; 1752 (++tmp)->name[0] = 0; 1753 1754 return (0); 1755 } 1756 1757 1758 /*** Authentication-related utility functions ********************************/ 1759 1760 static const char * 1761 fetch_read_word(FILE *f) 1762 { 1763 static char word[1024]; 1764 1765 if (fscanf(f, " %1023s ", word) != 1) 1766 return (NULL); 1767 return (word); 1768 } 1769 1770 static int 1771 fetch_netrc_open(void) 1772 { 1773 struct passwd *pwd; 1774 char fn[PATH_MAX]; 1775 const char *p; 1776 int fd, serrno; 1777 1778 if ((p = getenv("NETRC")) != NULL) { 1779 DEBUGF("NETRC=%s\n", p); 1780 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1781 fetch_info("$NETRC specifies a file name " 1782 "longer than PATH_MAX"); 1783 return (-1); 1784 } 1785 } else { 1786 if ((p = getenv("HOME")) == NULL) { 1787 if ((pwd = getpwuid(getuid())) == NULL || 1788 (p = pwd->pw_dir) == NULL) 1789 return (-1); 1790 } 1791 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1792 return (-1); 1793 } 1794 1795 if ((fd = open(fn, O_RDONLY)) < 0) { 1796 serrno = errno; 1797 DEBUGF("%s: %s\n", fn, strerror(serrno)); 1798 errno = serrno; 1799 } 1800 return (fd); 1801 } 1802 1803 /* 1804 * Get authentication data for a URL from .netrc 1805 */ 1806 int 1807 fetch_netrc_auth(struct url *url) 1808 { 1809 const char *word; 1810 int serrno; 1811 FILE *f; 1812 1813 if (url->netrcfd < 0) 1814 url->netrcfd = fetch_netrc_open(); 1815 if (url->netrcfd < 0) 1816 return (-1); 1817 if ((f = fdopen(url->netrcfd, "r")) == NULL) { 1818 serrno = errno; 1819 DEBUGF("fdopen(netrcfd): %s", strerror(errno)); 1820 close(url->netrcfd); 1821 url->netrcfd = -1; 1822 errno = serrno; 1823 return (-1); 1824 } 1825 rewind(f); 1826 DEBUGF("searching netrc for %s\n", url->host); 1827 while ((word = fetch_read_word(f)) != NULL) { 1828 if (strcmp(word, "default") == 0) { 1829 DEBUGF("using default netrc settings\n"); 1830 break; 1831 } 1832 if (strcmp(word, "machine") == 0 && 1833 (word = fetch_read_word(f)) != NULL && 1834 strcasecmp(word, url->host) == 0) { 1835 DEBUGF("using netrc settings for %s\n", word); 1836 break; 1837 } 1838 } 1839 if (word == NULL) 1840 goto ferr; 1841 while ((word = fetch_read_word(f)) != NULL) { 1842 if (strcmp(word, "login") == 0) { 1843 if ((word = fetch_read_word(f)) == NULL) 1844 goto ferr; 1845 if (snprintf(url->user, sizeof(url->user), 1846 "%s", word) > (int)sizeof(url->user)) { 1847 fetch_info("login name in .netrc is too long"); 1848 url->user[0] = '\0'; 1849 } 1850 } else if (strcmp(word, "password") == 0) { 1851 if ((word = fetch_read_word(f)) == NULL) 1852 goto ferr; 1853 if (snprintf(url->pwd, sizeof(url->pwd), 1854 "%s", word) > (int)sizeof(url->pwd)) { 1855 fetch_info("password in .netrc is too long"); 1856 url->pwd[0] = '\0'; 1857 } 1858 } else if (strcmp(word, "account") == 0) { 1859 if ((word = fetch_read_word(f)) == NULL) 1860 goto ferr; 1861 /* XXX not supported! */ 1862 } else { 1863 break; 1864 } 1865 } 1866 fclose(f); 1867 url->netrcfd = -1; 1868 return (0); 1869 ferr: 1870 serrno = errno; 1871 fclose(f); 1872 url->netrcfd = -1; 1873 errno = serrno; 1874 return (-1); 1875 } 1876 1877 /* 1878 * The no_proxy environment variable specifies a set of domains for 1879 * which the proxy should not be consulted; the contents is a comma-, 1880 * or space-separated list of domain names. A single asterisk will 1881 * override all proxy variables and no transactions will be proxied 1882 * (for compatibility with lynx and curl, see the discussion at 1883 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1884 */ 1885 int 1886 fetch_no_proxy_match(const char *host) 1887 { 1888 const char *no_proxy, *p, *q; 1889 size_t h_len, d_len; 1890 1891 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1892 (no_proxy = getenv("no_proxy")) == NULL) 1893 return (0); 1894 1895 /* asterisk matches any hostname */ 1896 if (strcmp(no_proxy, "*") == 0) 1897 return (1); 1898 1899 h_len = strlen(host); 1900 p = no_proxy; 1901 do { 1902 /* position p at the beginning of a domain suffix */ 1903 while (*p == ',' || isspace((unsigned char)*p)) 1904 p++; 1905 1906 /* position q at the first separator character */ 1907 for (q = p; *q; ++q) 1908 if (*q == ',' || isspace((unsigned char)*q)) 1909 break; 1910 1911 d_len = q - p; 1912 if (d_len > 0 && h_len >= d_len && 1913 strncasecmp(host + h_len - d_len, 1914 p, d_len) == 0) { 1915 /* domain name matches */ 1916 return (1); 1917 } 1918 1919 p = q + 1; 1920 } while (*q); 1921 1922 return (0); 1923 } 1924