1 /* $OpenBSD: server_http.c,v 1.150 2022/03/02 11:10:43 florian Exp $ */ 2 3 /* 4 * Copyright (c) 2020 Matthias Pressfreund <mpfr@fn.de> 5 * Copyright (c) 2006 - 2018 Reyk Floeter <reyk@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/types.h> 21 #include <sys/queue.h> 22 #include <sys/socket.h> 23 #include <sys/tree.h> 24 #include <sys/stat.h> 25 26 #include <netinet/in.h> 27 #include <arpa/inet.h> 28 29 #include <errno.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <unistd.h> 33 #include <limits.h> 34 #include <fnmatch.h> 35 #include <stdio.h> 36 #include <time.h> 37 #include <resolv.h> 38 #include <event.h> 39 #include <ctype.h> 40 #include <vis.h> 41 #include <fcntl.h> 42 43 #include "httpd.h" 44 #include "http.h" 45 #include "patterns.h" 46 47 static int server_httpmethod_cmp(const void *, const void *); 48 static int server_httperror_cmp(const void *, const void *); 49 void server_httpdesc_free(struct http_descriptor *); 50 int server_http_authenticate(struct server_config *, 51 struct client *); 52 static int http_version_num(char *); 53 char *server_expand_http(struct client *, const char *, 54 char *, size_t); 55 char *replace_var(char *, const char *, const char *); 56 char *read_errdoc(const char *, const char *); 57 58 static struct http_method http_methods[] = HTTP_METHODS; 59 static struct http_error http_errors[] = HTTP_ERRORS; 60 61 void 62 server_http(void) 63 { 64 DPRINTF("%s: sorting lookup tables, pid %d", __func__, getpid()); 65 66 /* Sort the HTTP lookup arrays */ 67 qsort(http_methods, sizeof(http_methods) / 68 sizeof(http_methods[0]) - 1, 69 sizeof(http_methods[0]), server_httpmethod_cmp); 70 qsort(http_errors, sizeof(http_errors) / 71 sizeof(http_errors[0]) - 1, 72 sizeof(http_errors[0]), server_httperror_cmp); 73 } 74 75 void 76 server_http_init(struct server *srv) 77 { 78 /* nothing */ 79 } 80 81 int 82 server_httpdesc_init(struct client *clt) 83 { 84 struct http_descriptor *desc; 85 86 if ((desc = calloc(1, sizeof(*desc))) == NULL) 87 return (-1); 88 RB_INIT(&desc->http_headers); 89 clt->clt_descreq = desc; 90 91 if ((desc = calloc(1, sizeof(*desc))) == NULL) { 92 /* req will be cleaned up later */ 93 return (-1); 94 } 95 RB_INIT(&desc->http_headers); 96 clt->clt_descresp = desc; 97 98 return (0); 99 } 100 101 void 102 server_httpdesc_free(struct http_descriptor *desc) 103 { 104 if (desc == NULL) 105 return; 106 107 free(desc->http_path); 108 desc->http_path = NULL; 109 free(desc->http_path_orig); 110 desc->http_path_orig = NULL; 111 free(desc->http_path_alias); 112 desc->http_path_alias = NULL; 113 free(desc->http_query); 114 desc->http_query = NULL; 115 free(desc->http_query_alias); 116 desc->http_query_alias = NULL; 117 free(desc->http_version); 118 desc->http_version = NULL; 119 free(desc->http_host); 120 desc->http_host = NULL; 121 122 kv_purge(&desc->http_headers); 123 desc->http_lastheader = NULL; 124 desc->http_method = 0; 125 desc->http_chunked = 0; 126 } 127 128 int 129 server_http_authenticate(struct server_config *srv_conf, struct client *clt) 130 { 131 char decoded[1024]; 132 FILE *fp = NULL; 133 struct http_descriptor *desc = clt->clt_descreq; 134 const struct auth *auth = srv_conf->auth; 135 struct kv *ba, key; 136 size_t linesize = 0; 137 ssize_t linelen; 138 int ret = -1; 139 char *line = NULL, *user = NULL, *pass = NULL; 140 char *clt_user = NULL, *clt_pass = NULL; 141 142 memset(decoded, 0, sizeof(decoded)); 143 key.kv_key = "Authorization"; 144 145 if ((ba = kv_find(&desc->http_headers, &key)) == NULL || 146 ba->kv_value == NULL) 147 goto done; 148 149 if (strncmp(ba->kv_value, "Basic ", strlen("Basic ")) != 0) 150 goto done; 151 152 if (b64_pton(strchr(ba->kv_value, ' ') + 1, (uint8_t *)decoded, 153 sizeof(decoded)) <= 0) 154 goto done; 155 156 if ((clt_pass = strchr(decoded, ':')) == NULL) 157 goto done; 158 159 clt_user = decoded; 160 *clt_pass++ = '\0'; 161 if ((clt->clt_remote_user = strdup(clt_user)) == NULL) 162 goto done; 163 164 if ((fp = fopen(auth->auth_htpasswd, "r")) == NULL) 165 goto done; 166 167 while ((linelen = getline(&line, &linesize, fp)) != -1) { 168 if (line[linelen - 1] == '\n') 169 line[linelen - 1] = '\0'; 170 user = line; 171 pass = strchr(line, ':'); 172 173 if (pass == NULL) { 174 explicit_bzero(line, linelen); 175 continue; 176 } 177 178 *pass++ = '\0'; 179 180 if (strcmp(clt_user, user) != 0) { 181 explicit_bzero(line, linelen); 182 continue; 183 } 184 185 if (crypt_checkpass(clt_pass, pass) == 0) { 186 explicit_bzero(line, linelen); 187 ret = 0; 188 break; 189 } 190 } 191 done: 192 free(line); 193 if (fp != NULL) 194 fclose(fp); 195 196 if (ba != NULL && ba->kv_value != NULL) { 197 explicit_bzero(ba->kv_value, strlen(ba->kv_value)); 198 explicit_bzero(decoded, sizeof(decoded)); 199 } 200 201 return (ret); 202 } 203 204 static int 205 http_version_num(char *version) 206 { 207 if (strlen(version) != 8 || strncmp(version, "HTTP/", 5) != 0 208 || !isdigit((unsigned char)version[5]) || version[6] != '.' 209 || !isdigit((unsigned char)version[7])) 210 return (-1); 211 if (version[5] == '0' && version[7] == '9') 212 return (9); 213 if (version[5] == '1') { 214 if (version[7] == '0') 215 return (10); 216 else 217 /* any other version 1.x gets downgraded to 1.1 */ 218 return (11); 219 } 220 return (0); 221 } 222 223 void 224 server_read_http(struct bufferevent *bev, void *arg) 225 { 226 struct client *clt = arg; 227 struct http_descriptor *desc = clt->clt_descreq; 228 struct evbuffer *src = EVBUFFER_INPUT(bev); 229 char *line = NULL, *key, *value; 230 const char *errstr; 231 char *http_version, *query; 232 size_t size, linelen; 233 int version; 234 struct kv *hdr = NULL; 235 236 getmonotime(&clt->clt_tv_last); 237 238 size = EVBUFFER_LENGTH(src); 239 DPRINTF("%s: session %d: size %lu, to read %lld", 240 __func__, clt->clt_id, size, clt->clt_toread); 241 if (!size) { 242 clt->clt_toread = TOREAD_HTTP_HEADER; 243 goto done; 244 } 245 246 while (!clt->clt_headersdone) { 247 if (!clt->clt_line) { 248 /* Peek into the buffer to see if it looks like HTTP */ 249 key = EVBUFFER_DATA(src); 250 if (!isalpha((unsigned char)*key)) { 251 server_abort_http(clt, 400, 252 "invalid request line"); 253 goto abort; 254 } 255 } 256 257 if ((line = evbuffer_readln(src, 258 &linelen, EVBUFFER_EOL_CRLF_STRICT)) == NULL) { 259 /* No newline found after too many bytes */ 260 if (size > SERVER_MAXHEADERLENGTH) { 261 server_abort_http(clt, 413, 262 "request line too long"); 263 goto abort; 264 } 265 break; 266 } 267 268 /* 269 * An empty line indicates the end of the request. 270 * libevent already stripped the \r\n for us. 271 */ 272 if (!linelen) { 273 clt->clt_headersdone = 1; 274 free(line); 275 break; 276 } 277 key = line; 278 279 /* Limit the total header length minus \r\n */ 280 clt->clt_headerlen += linelen; 281 if (clt->clt_headerlen > SERVER_MAXHEADERLENGTH) { 282 server_abort_http(clt, 413, "request too large"); 283 goto abort; 284 } 285 286 /* 287 * The first line is the GET/POST/PUT/... request, 288 * subsequent lines are HTTP headers. 289 */ 290 if (++clt->clt_line == 1) 291 value = strchr(key, ' '); 292 else if (*key == ' ' || *key == '\t') 293 /* Multiline headers wrap with a space or tab */ 294 value = NULL; 295 else { 296 /* Not a multiline header, should have a : */ 297 value = strchr(key, ':'); 298 if (value == NULL) { 299 server_abort_http(clt, 400, "malformed"); 300 goto abort; 301 } 302 } 303 if (value == NULL) { 304 if (clt->clt_line == 1) { 305 server_abort_http(clt, 400, "malformed"); 306 goto abort; 307 } 308 309 /* Append line to the last header, if present */ 310 if (kv_extend(&desc->http_headers, 311 desc->http_lastheader, line) == NULL) 312 goto fail; 313 314 free(line); 315 continue; 316 } 317 if (*value == ':') { 318 *value++ = '\0'; 319 value += strspn(value, " \t\r\n"); 320 } else { 321 *value++ = '\0'; 322 } 323 324 DPRINTF("%s: session %d: header '%s: %s'", __func__, 325 clt->clt_id, key, value); 326 327 /* 328 * Identify and handle specific HTTP request methods 329 */ 330 if (clt->clt_line == 1) { 331 if ((desc->http_method = server_httpmethod_byname(key)) 332 == HTTP_METHOD_NONE) { 333 server_abort_http(clt, 400, "malformed"); 334 goto abort; 335 } 336 337 /* 338 * Decode request path and query 339 */ 340 desc->http_path = strdup(value); 341 if (desc->http_path == NULL) 342 goto fail; 343 344 http_version = strchr(desc->http_path, ' '); 345 if (http_version == NULL) { 346 server_abort_http(clt, 400, "malformed"); 347 goto abort; 348 } 349 350 *http_version++ = '\0'; 351 352 /* 353 * We have to allocate the strings because they could 354 * be changed independently by the filters later. 355 * Allow HTTP version 0.9 to 1.1. 356 * Downgrade http version > 1.1 <= 1.9 to version 1.1. 357 * Return HTTP Version Not Supported for anything else. 358 */ 359 360 version = http_version_num(http_version); 361 362 if (version == -1) { 363 server_abort_http(clt, 400, "malformed"); 364 goto abort; 365 } else if (version == 0) { 366 server_abort_http(clt, 505, "bad http version"); 367 goto abort; 368 } else if (version == 11) { 369 if ((desc->http_version = 370 strdup("HTTP/1.1")) == NULL) 371 goto fail; 372 } else { 373 if ((desc->http_version = 374 strdup(http_version)) == NULL) 375 goto fail; 376 } 377 378 query = strchr(desc->http_path, '?'); 379 if (query != NULL) { 380 *query++ = '\0'; 381 382 if ((desc->http_query = strdup(query)) == NULL) 383 goto fail; 384 } 385 386 } else if (desc->http_method != HTTP_METHOD_NONE && 387 strcasecmp("Content-Length", key) == 0) { 388 if (desc->http_method == HTTP_METHOD_TRACE || 389 desc->http_method == HTTP_METHOD_CONNECT) { 390 /* 391 * These method should not have a body 392 * and thus no Content-Length header. 393 */ 394 server_abort_http(clt, 400, "malformed"); 395 goto abort; 396 } 397 398 /* 399 * Need to read data from the client after the 400 * HTTP header. 401 * XXX What about non-standard clients not using 402 * the carriage return? And some browsers seem to 403 * include the line length in the content-length. 404 */ 405 clt->clt_toread = strtonum(value, 0, LLONG_MAX, 406 &errstr); 407 if (errstr) { 408 server_abort_http(clt, 500, errstr); 409 goto abort; 410 } 411 } 412 413 if (strcasecmp("Transfer-Encoding", key) == 0 && 414 strcasecmp("chunked", value) == 0) 415 desc->http_chunked = 1; 416 417 if (clt->clt_line != 1) { 418 if ((hdr = kv_add(&desc->http_headers, key, 419 value)) == NULL) 420 goto fail; 421 422 desc->http_lastheader = hdr; 423 } 424 425 free(line); 426 } 427 if (clt->clt_headersdone) { 428 if (desc->http_method == HTTP_METHOD_NONE) { 429 server_abort_http(clt, 406, "no method"); 430 return; 431 } 432 433 switch (desc->http_method) { 434 case HTTP_METHOD_CONNECT: 435 /* Data stream */ 436 clt->clt_toread = TOREAD_UNLIMITED; 437 bev->readcb = server_read; 438 break; 439 case HTTP_METHOD_GET: 440 case HTTP_METHOD_HEAD: 441 /* WebDAV methods */ 442 case HTTP_METHOD_COPY: 443 case HTTP_METHOD_MOVE: 444 clt->clt_toread = 0; 445 break; 446 case HTTP_METHOD_DELETE: 447 case HTTP_METHOD_OPTIONS: 448 case HTTP_METHOD_POST: 449 case HTTP_METHOD_PUT: 450 case HTTP_METHOD_RESPONSE: 451 /* WebDAV methods */ 452 case HTTP_METHOD_PROPFIND: 453 case HTTP_METHOD_PROPPATCH: 454 case HTTP_METHOD_MKCOL: 455 case HTTP_METHOD_LOCK: 456 case HTTP_METHOD_UNLOCK: 457 case HTTP_METHOD_VERSION_CONTROL: 458 case HTTP_METHOD_REPORT: 459 case HTTP_METHOD_CHECKOUT: 460 case HTTP_METHOD_CHECKIN: 461 case HTTP_METHOD_UNCHECKOUT: 462 case HTTP_METHOD_MKWORKSPACE: 463 case HTTP_METHOD_UPDATE: 464 case HTTP_METHOD_LABEL: 465 case HTTP_METHOD_MERGE: 466 case HTTP_METHOD_BASELINE_CONTROL: 467 case HTTP_METHOD_MKACTIVITY: 468 case HTTP_METHOD_ORDERPATCH: 469 case HTTP_METHOD_ACL: 470 case HTTP_METHOD_MKREDIRECTREF: 471 case HTTP_METHOD_UPDATEREDIRECTREF: 472 case HTTP_METHOD_SEARCH: 473 case HTTP_METHOD_PATCH: 474 /* HTTP request payload */ 475 if (clt->clt_toread > 0) 476 bev->readcb = server_read_httpcontent; 477 478 /* Single-pass HTTP body */ 479 if (clt->clt_toread < 0) { 480 clt->clt_toread = TOREAD_UNLIMITED; 481 bev->readcb = server_read; 482 } 483 break; 484 default: 485 server_abort_http(clt, 405, "method not allowed"); 486 return; 487 } 488 if (desc->http_chunked) { 489 /* Chunked transfer encoding */ 490 clt->clt_toread = TOREAD_HTTP_CHUNK_LENGTH; 491 bev->readcb = server_read_httpchunks; 492 } 493 494 done: 495 if (clt->clt_toread != 0) 496 bufferevent_disable(bev, EV_READ); 497 server_response(httpd_env, clt); 498 return; 499 } 500 if (clt->clt_done) { 501 server_close(clt, "done"); 502 return; 503 } 504 if (EVBUFFER_LENGTH(src) && bev->readcb != server_read_http) 505 bev->readcb(bev, arg); 506 bufferevent_enable(bev, EV_READ); 507 return; 508 fail: 509 server_abort_http(clt, 500, strerror(errno)); 510 abort: 511 free(line); 512 } 513 514 void 515 server_read_httpcontent(struct bufferevent *bev, void *arg) 516 { 517 struct client *clt = arg; 518 struct evbuffer *src = EVBUFFER_INPUT(bev); 519 size_t size; 520 521 getmonotime(&clt->clt_tv_last); 522 523 size = EVBUFFER_LENGTH(src); 524 DPRINTF("%s: session %d: size %lu, to read %lld", __func__, 525 clt->clt_id, size, clt->clt_toread); 526 if (!size) 527 return; 528 529 if (clt->clt_toread > 0) { 530 /* Read content data */ 531 if ((off_t)size > clt->clt_toread) { 532 size = clt->clt_toread; 533 if (fcgi_add_stdin(clt, src) == -1) 534 goto fail; 535 clt->clt_toread = 0; 536 } else { 537 if (fcgi_add_stdin(clt, src) == -1) 538 goto fail; 539 clt->clt_toread -= size; 540 } 541 DPRINTF("%s: done, size %lu, to read %lld", __func__, 542 size, clt->clt_toread); 543 } 544 if (clt->clt_toread == 0) { 545 fcgi_add_stdin(clt, NULL); 546 clt->clt_toread = TOREAD_HTTP_HEADER; 547 bufferevent_disable(bev, EV_READ); 548 bev->readcb = server_read_http; 549 return; 550 } 551 if (clt->clt_done) 552 goto done; 553 if (bev->readcb != server_read_httpcontent) 554 bev->readcb(bev, arg); 555 556 return; 557 done: 558 return; 559 fail: 560 server_close(clt, strerror(errno)); 561 } 562 563 void 564 server_read_httpchunks(struct bufferevent *bev, void *arg) 565 { 566 struct client *clt = arg; 567 struct evbuffer *src = EVBUFFER_INPUT(bev); 568 char *line; 569 long long llval; 570 size_t size; 571 572 getmonotime(&clt->clt_tv_last); 573 574 size = EVBUFFER_LENGTH(src); 575 DPRINTF("%s: session %d: size %lu, to read %lld", __func__, 576 clt->clt_id, size, clt->clt_toread); 577 if (!size) 578 return; 579 580 if (clt->clt_toread > 0) { 581 /* Read chunk data */ 582 if ((off_t)size > clt->clt_toread) { 583 size = clt->clt_toread; 584 if (server_bufferevent_write_chunk(clt, src, size) 585 == -1) 586 goto fail; 587 clt->clt_toread = 0; 588 } else { 589 if (server_bufferevent_write_buffer(clt, src) == -1) 590 goto fail; 591 clt->clt_toread -= size; 592 } 593 DPRINTF("%s: done, size %lu, to read %lld", __func__, 594 size, clt->clt_toread); 595 } 596 switch (clt->clt_toread) { 597 case TOREAD_HTTP_CHUNK_LENGTH: 598 line = evbuffer_readln(src, NULL, EVBUFFER_EOL_CRLF_STRICT); 599 if (line == NULL) { 600 /* Ignore empty line, continue */ 601 bufferevent_enable(bev, EV_READ); 602 return; 603 } 604 if (strlen(line) == 0) { 605 free(line); 606 goto next; 607 } 608 609 /* 610 * Read prepended chunk size in hex, ignore the trailer. 611 * The returned signed value must not be negative. 612 */ 613 if (sscanf(line, "%llx", &llval) != 1 || llval < 0) { 614 free(line); 615 server_close(clt, "invalid chunk size"); 616 return; 617 } 618 619 if (server_bufferevent_print(clt, line) == -1 || 620 server_bufferevent_print(clt, "\r\n") == -1) { 621 free(line); 622 goto fail; 623 } 624 free(line); 625 626 if ((clt->clt_toread = llval) == 0) { 627 DPRINTF("%s: last chunk", __func__); 628 clt->clt_toread = TOREAD_HTTP_CHUNK_TRAILER; 629 } 630 break; 631 case TOREAD_HTTP_CHUNK_TRAILER: 632 /* Last chunk is 0 bytes followed by trailer and empty line */ 633 line = evbuffer_readln(src, NULL, EVBUFFER_EOL_CRLF_STRICT); 634 if (line == NULL) { 635 /* Ignore empty line, continue */ 636 bufferevent_enable(bev, EV_READ); 637 return; 638 } 639 if (server_bufferevent_print(clt, line) == -1 || 640 server_bufferevent_print(clt, "\r\n") == -1) { 641 free(line); 642 goto fail; 643 } 644 if (strlen(line) == 0) { 645 /* Switch to HTTP header mode */ 646 clt->clt_toread = TOREAD_HTTP_HEADER; 647 bev->readcb = server_read_http; 648 } 649 free(line); 650 break; 651 case 0: 652 /* Chunk is terminated by an empty newline */ 653 line = evbuffer_readln(src, NULL, EVBUFFER_EOL_CRLF_STRICT); 654 free(line); 655 if (server_bufferevent_print(clt, "\r\n") == -1) 656 goto fail; 657 clt->clt_toread = TOREAD_HTTP_CHUNK_LENGTH; 658 break; 659 } 660 661 next: 662 if (clt->clt_done) 663 goto done; 664 if (EVBUFFER_LENGTH(src)) 665 bev->readcb(bev, arg); 666 bufferevent_enable(bev, EV_READ); 667 return; 668 669 done: 670 server_close(clt, "last http chunk read (done)"); 671 return; 672 fail: 673 server_close(clt, strerror(errno)); 674 } 675 676 void 677 server_read_httprange(struct bufferevent *bev, void *arg) 678 { 679 struct client *clt = arg; 680 struct evbuffer *src = EVBUFFER_INPUT(bev); 681 size_t size; 682 struct media_type *media; 683 struct range_data *r = &clt->clt_ranges; 684 struct range *range; 685 686 getmonotime(&clt->clt_tv_last); 687 688 if (r->range_toread > 0) { 689 size = EVBUFFER_LENGTH(src); 690 if (!size) 691 return; 692 693 /* Read chunk data */ 694 if ((off_t)size > r->range_toread) { 695 size = r->range_toread; 696 if (server_bufferevent_write_chunk(clt, src, size) 697 == -1) 698 goto fail; 699 r->range_toread = 0; 700 } else { 701 if (server_bufferevent_write_buffer(clt, src) == -1) 702 goto fail; 703 r->range_toread -= size; 704 } 705 if (r->range_toread < 1) 706 r->range_toread = TOREAD_HTTP_RANGE; 707 DPRINTF("%s: done, size %lu, to read %lld", __func__, 708 size, r->range_toread); 709 } 710 711 switch (r->range_toread) { 712 case TOREAD_HTTP_RANGE: 713 if (r->range_index >= r->range_count) { 714 if (r->range_count > 1) { 715 /* Add end marker */ 716 if (server_bufferevent_printf(clt, 717 "\r\n--%llu--\r\n", 718 clt->clt_boundary) == -1) 719 goto fail; 720 } 721 r->range_toread = TOREAD_HTTP_NONE; 722 break; 723 } 724 725 range = &r->range[r->range_index]; 726 727 if (r->range_count > 1) { 728 media = r->range_media; 729 if (server_bufferevent_printf(clt, 730 "\r\n--%llu\r\n" 731 "Content-Type: %s/%s\r\n" 732 "Content-Range: bytes %lld-%lld/%zu\r\n\r\n", 733 clt->clt_boundary, 734 media->media_type, media->media_subtype, 735 range->start, range->end, r->range_total) == -1) 736 goto fail; 737 } 738 r->range_toread = range->end - range->start + 1; 739 740 if (lseek(clt->clt_fd, range->start, SEEK_SET) == -1) 741 goto fail; 742 743 /* Throw away bytes that are already in the input buffer */ 744 evbuffer_drain(src, EVBUFFER_LENGTH(src)); 745 746 /* Increment for the next part */ 747 r->range_index++; 748 break; 749 case TOREAD_HTTP_NONE: 750 goto done; 751 case 0: 752 break; 753 } 754 755 if (clt->clt_done) 756 goto done; 757 758 if (EVBUFFER_LENGTH(EVBUFFER_OUTPUT(clt->clt_bev)) > (size_t) 759 SERVER_MAX_PREFETCH * clt->clt_sndbufsiz) { 760 bufferevent_disable(clt->clt_srvbev, EV_READ); 761 clt->clt_srvbev_throttled = 1; 762 } 763 764 return; 765 done: 766 (*bev->errorcb)(bev, EVBUFFER_READ, bev->cbarg); 767 return; 768 fail: 769 server_close(clt, strerror(errno)); 770 } 771 772 void 773 server_reset_http(struct client *clt) 774 { 775 struct server *srv = clt->clt_srv; 776 777 server_log(clt, NULL); 778 779 server_httpdesc_free(clt->clt_descreq); 780 server_httpdesc_free(clt->clt_descresp); 781 clt->clt_headerlen = 0; 782 clt->clt_headersdone = 0; 783 clt->clt_done = 0; 784 clt->clt_line = 0; 785 clt->clt_chunk = 0; 786 free(clt->clt_remote_user); 787 clt->clt_remote_user = NULL; 788 clt->clt_bev->readcb = server_read_http; 789 clt->clt_srv_conf = &srv->srv_conf; 790 str_match_free(&clt->clt_srv_match); 791 } 792 793 ssize_t 794 server_http_time(time_t t, char *tmbuf, size_t len) 795 { 796 struct tm tm; 797 798 /* New HTTP/1.1 RFC 7231 prefers IMF-fixdate from RFC 5322 */ 799 if (t == -1 || gmtime_r(&t, &tm) == NULL) 800 return (-1); 801 else 802 return (strftime(tmbuf, len, "%a, %d %h %Y %T %Z", &tm)); 803 } 804 805 const char * 806 server_http_host(struct sockaddr_storage *ss, char *buf, size_t len) 807 { 808 char hbuf[HOST_NAME_MAX+1]; 809 in_port_t port; 810 811 if (print_host(ss, buf, len) == NULL) 812 return (NULL); 813 814 port = ntohs(server_socket_getport(ss)); 815 if (port == HTTP_PORT) 816 return (buf); 817 818 switch (ss->ss_family) { 819 case AF_INET: 820 if ((size_t)snprintf(hbuf, sizeof(hbuf), 821 "%s:%u", buf, port) >= sizeof(hbuf)) 822 return (NULL); 823 break; 824 case AF_INET6: 825 if ((size_t)snprintf(hbuf, sizeof(hbuf), 826 "[%s]:%u", buf, port) >= sizeof(hbuf)) 827 return (NULL); 828 break; 829 } 830 831 if (strlcpy(buf, hbuf, len) >= len) 832 return (NULL); 833 834 return (buf); 835 } 836 837 char * 838 server_http_parsehost(char *host, char *buf, size_t len, int *portval) 839 { 840 char *start, *end, *port; 841 const char *errstr = NULL; 842 843 if (strlcpy(buf, host, len) >= len) { 844 log_debug("%s: host name too long", __func__); 845 return (NULL); 846 } 847 848 start = buf; 849 end = port = NULL; 850 851 if (*start == '[' && (end = strchr(start, ']')) != NULL) { 852 /* Address enclosed in [] with port, eg. [2001:db8::1]:80 */ 853 start++; 854 *end++ = '\0'; 855 if ((port = strchr(end, ':')) == NULL || *port == '\0') 856 port = NULL; 857 else 858 port++; 859 memmove(buf, start, strlen(start) + 1); 860 } else if ((end = strchr(start, ':')) != NULL) { 861 /* Name or address with port, eg. www.example.com:80 */ 862 *end++ = '\0'; 863 port = end; 864 } else { 865 /* Name or address with default port, eg. www.example.com */ 866 port = NULL; 867 } 868 869 if (port != NULL) { 870 /* Save the requested port */ 871 *portval = strtonum(port, 0, 0xffff, &errstr); 872 if (errstr != NULL) { 873 log_debug("%s: invalid port: %s", __func__, 874 strerror(errno)); 875 return (NULL); 876 } 877 *portval = htons(*portval); 878 } else { 879 /* Port not given, indicate the default port */ 880 *portval = -1; 881 } 882 883 return (start); 884 } 885 886 void 887 server_abort_http(struct client *clt, unsigned int code, const char *msg) 888 { 889 struct server_config *srv_conf = clt->clt_srv_conf; 890 struct bufferevent *bev = clt->clt_bev; 891 struct http_descriptor *desc = clt->clt_descreq; 892 const char *httperr = NULL, *style; 893 char *httpmsg, *body = NULL, *extraheader = NULL; 894 char tmbuf[32], hbuf[128], *hstsheader = NULL; 895 char *clenheader = NULL; 896 char buf[IBUF_READ_SIZE]; 897 char *escapedmsg = NULL; 898 char cstr[5]; 899 ssize_t bodylen; 900 901 if (code == 0) { 902 server_close(clt, "dropped"); 903 return; 904 } 905 906 if ((httperr = server_httperror_byid(code)) == NULL) 907 httperr = "Unknown Error"; 908 909 if (bev == NULL) 910 goto done; 911 912 if (server_log_http(clt, code, 0) == -1) 913 goto done; 914 915 /* Some system information */ 916 if (print_host(&srv_conf->ss, hbuf, sizeof(hbuf)) == NULL) 917 goto done; 918 919 if (server_http_time(time(NULL), tmbuf, sizeof(tmbuf)) <= 0) 920 goto done; 921 922 /* Do not send details of the Internal Server Error */ 923 switch (code) { 924 case 301: 925 case 302: 926 case 303: 927 case 307: 928 case 308: 929 if (msg == NULL) 930 break; 931 memset(buf, 0, sizeof(buf)); 932 if (server_expand_http(clt, msg, buf, sizeof(buf)) == NULL) 933 goto done; 934 if (asprintf(&extraheader, "Location: %s\r\n", buf) == -1) { 935 code = 500; 936 extraheader = NULL; 937 } 938 msg = buf; 939 break; 940 case 401: 941 if (msg == NULL) 942 break; 943 if (stravis(&escapedmsg, msg, VIS_DQ) == -1) { 944 code = 500; 945 extraheader = NULL; 946 } else if (asprintf(&extraheader, 947 "WWW-Authenticate: Basic realm=\"%s\"\r\n", escapedmsg) 948 == -1) { 949 code = 500; 950 extraheader = NULL; 951 } 952 break; 953 case 416: 954 if (msg == NULL) 955 break; 956 if (asprintf(&extraheader, 957 "Content-Range: %s\r\n", msg) == -1) { 958 code = 500; 959 extraheader = NULL; 960 } 961 break; 962 default: 963 /* 964 * Do not send details of the error. Traditionally, 965 * web servers responsed with the request path on 40x 966 * errors which could be abused to inject JavaScript etc. 967 * Instead of sanitizing the path here, we just don't 968 * reprint it. 969 */ 970 break; 971 } 972 973 free(escapedmsg); 974 975 if ((srv_conf->flags & SRVFLAG_ERRDOCS) == 0) 976 goto builtin; /* errdocs not enabled */ 977 if ((size_t)snprintf(cstr, sizeof(cstr), "%03u", code) >= sizeof(cstr)) 978 goto builtin; 979 980 if ((body = read_errdoc(srv_conf->errdocroot, cstr)) == NULL && 981 (body = read_errdoc(srv_conf->errdocroot, HTTPD_ERRDOCTEMPLATE)) 982 == NULL) 983 goto builtin; 984 985 body = replace_var(body, "$HTTP_ERROR", httperr); 986 body = replace_var(body, "$RESPONSE_CODE", cstr); 987 body = replace_var(body, "$SERVER_SOFTWARE", HTTPD_SERVERNAME); 988 bodylen = strlen(body); 989 goto send; 990 991 builtin: 992 /* A CSS stylesheet allows minimal customization by the user */ 993 style = "body { background-color: white; color: black; font-family: " 994 "'Comic Sans MS', 'Chalkboard SE', 'Comic Neue', sans-serif; }\n" 995 "hr { border: 0; border-bottom: 1px dashed; }\n" 996 "@media (prefers-color-scheme: dark) {\n" 997 "body { background-color: #1E1F21; color: #EEEFF1; }\n" 998 "a { color: #BAD7FF; }\n}"; 999 1000 /* Generate simple HTML error document */ 1001 if ((bodylen = asprintf(&body, 1002 "<!DOCTYPE html>\n" 1003 "<html>\n" 1004 "<head>\n" 1005 "<meta charset=\"utf-8\">\n" 1006 "<title>%03d %s</title>\n" 1007 "<style type=\"text/css\"><!--\n%s\n--></style>\n" 1008 "</head>\n" 1009 "<body>\n" 1010 "<h1>%03d %s</h1>\n" 1011 "<hr>\n<address>%s</address>\n" 1012 "</body>\n" 1013 "</html>\n", 1014 code, httperr, style, code, httperr, HTTPD_SERVERNAME)) == -1) { 1015 body = NULL; 1016 goto done; 1017 } 1018 1019 send: 1020 if (srv_conf->flags & SRVFLAG_SERVER_HSTS && 1021 srv_conf->flags & SRVFLAG_TLS) { 1022 if (asprintf(&hstsheader, "Strict-Transport-Security: " 1023 "max-age=%d%s%s\r\n", srv_conf->hsts_max_age, 1024 srv_conf->hsts_flags & HSTSFLAG_SUBDOMAINS ? 1025 "; includeSubDomains" : "", 1026 srv_conf->hsts_flags & HSTSFLAG_PRELOAD ? 1027 "; preload" : "") == -1) { 1028 hstsheader = NULL; 1029 goto done; 1030 } 1031 } 1032 1033 if ((code >= 100 && code < 200) || code == 204) 1034 clenheader = NULL; 1035 else { 1036 if (asprintf(&clenheader, 1037 "Content-Length: %zd\r\n", bodylen) == -1) { 1038 clenheader = NULL; 1039 goto done; 1040 } 1041 } 1042 1043 /* Add basic HTTP headers */ 1044 if (asprintf(&httpmsg, 1045 "HTTP/1.0 %03d %s\r\n" 1046 "Date: %s\r\n" 1047 "Server: %s\r\n" 1048 "Connection: close\r\n" 1049 "Content-Type: text/html\r\n" 1050 "%s" 1051 "%s" 1052 "%s" 1053 "\r\n" 1054 "%s", 1055 code, httperr, tmbuf, HTTPD_SERVERNAME, 1056 clenheader == NULL ? "" : clenheader, 1057 extraheader == NULL ? "" : extraheader, 1058 hstsheader == NULL ? "" : hstsheader, 1059 desc->http_method == HTTP_METHOD_HEAD || clenheader == NULL ? 1060 "" : body) == -1) 1061 goto done; 1062 1063 /* Dump the message without checking for success */ 1064 server_dump(clt, httpmsg, strlen(httpmsg)); 1065 free(httpmsg); 1066 1067 done: 1068 free(body); 1069 free(extraheader); 1070 free(hstsheader); 1071 free(clenheader); 1072 if (msg == NULL) 1073 msg = "\"\""; 1074 if (asprintf(&httpmsg, "%s (%03d %s)", msg, code, httperr) == -1) { 1075 server_close(clt, msg); 1076 } else { 1077 server_close(clt, httpmsg); 1078 free(httpmsg); 1079 } 1080 } 1081 1082 void 1083 server_close_http(struct client *clt) 1084 { 1085 struct http_descriptor *desc; 1086 1087 desc = clt->clt_descreq; 1088 server_httpdesc_free(desc); 1089 free(desc); 1090 clt->clt_descreq = NULL; 1091 1092 desc = clt->clt_descresp; 1093 server_httpdesc_free(desc); 1094 free(desc); 1095 clt->clt_descresp = NULL; 1096 free(clt->clt_remote_user); 1097 clt->clt_remote_user = NULL; 1098 1099 str_match_free(&clt->clt_srv_match); 1100 } 1101 1102 char * 1103 server_expand_http(struct client *clt, const char *val, char *buf, 1104 size_t len) 1105 { 1106 struct http_descriptor *desc = clt->clt_descreq; 1107 struct server_config *srv_conf = clt->clt_srv_conf; 1108 char ibuf[128], *str, *path, *query; 1109 const char *errstr = NULL, *p; 1110 size_t size; 1111 int n, ret; 1112 1113 if (strlcpy(buf, val, len) >= len) 1114 return (NULL); 1115 1116 /* Find previously matched substrings by index */ 1117 for (p = val; clt->clt_srv_match.sm_nmatch && 1118 (p = strstr(p, "%")) != NULL; p++) { 1119 if (!isdigit((unsigned char)*(p + 1))) 1120 continue; 1121 1122 /* Copy number, leading '%' char and add trailing \0 */ 1123 size = strspn(p + 1, "0123456789") + 2; 1124 if (size >= sizeof(ibuf)) 1125 return (NULL); 1126 (void)strlcpy(ibuf, p, size); 1127 n = strtonum(ibuf + 1, 0, 1128 clt->clt_srv_match.sm_nmatch - 1, &errstr); 1129 if (errstr != NULL) 1130 return (NULL); 1131 1132 /* Expand variable with matched value */ 1133 if ((str = url_encode(clt->clt_srv_match.sm_match[n])) == NULL) 1134 return (NULL); 1135 ret = expand_string(buf, len, ibuf, str); 1136 free(str); 1137 if (ret != 0) 1138 return (NULL); 1139 } 1140 if (strstr(val, "$DOCUMENT_URI") != NULL) { 1141 if ((path = url_encode(desc->http_path)) == NULL) 1142 return (NULL); 1143 ret = expand_string(buf, len, "$DOCUMENT_URI", path); 1144 free(path); 1145 if (ret != 0) 1146 return (NULL); 1147 } 1148 if (strstr(val, "$QUERY_STRING_ENC") != NULL) { 1149 if (desc->http_query == NULL) { 1150 ret = expand_string(buf, len, "$QUERY_STRING_ENC", ""); 1151 } else { 1152 if ((query = url_encode(desc->http_query)) == NULL) 1153 return (NULL); 1154 ret = expand_string(buf, len, "$QUERY_STRING_ENC", query); 1155 free(query); 1156 } 1157 if (ret != 0) 1158 return (NULL); 1159 } 1160 if (strstr(val, "$QUERY_STRING") != NULL) { 1161 if (desc->http_query == NULL) { 1162 ret = expand_string(buf, len, "$QUERY_STRING", ""); 1163 } else { 1164 ret = expand_string(buf, len, "$QUERY_STRING", 1165 desc->http_query); 1166 } 1167 if (ret != 0) 1168 return (NULL); 1169 } 1170 if (strstr(val, "$HTTP_HOST") != NULL) { 1171 if (desc->http_host == NULL) 1172 return (NULL); 1173 if ((str = url_encode(desc->http_host)) == NULL) 1174 return (NULL); 1175 expand_string(buf, len, "$HTTP_HOST", str); 1176 free(str); 1177 } 1178 if (strstr(val, "$REMOTE_") != NULL) { 1179 if (strstr(val, "$REMOTE_ADDR") != NULL) { 1180 if (print_host(&clt->clt_ss, 1181 ibuf, sizeof(ibuf)) == NULL) 1182 return (NULL); 1183 if (expand_string(buf, len, 1184 "$REMOTE_ADDR", ibuf) != 0) 1185 return (NULL); 1186 } 1187 if (strstr(val, "$REMOTE_PORT") != NULL) { 1188 snprintf(ibuf, sizeof(ibuf), 1189 "%u", ntohs(clt->clt_port)); 1190 if (expand_string(buf, len, 1191 "$REMOTE_PORT", ibuf) != 0) 1192 return (NULL); 1193 } 1194 if (strstr(val, "$REMOTE_USER") != NULL) { 1195 if ((srv_conf->flags & SRVFLAG_AUTH) && 1196 clt->clt_remote_user != NULL) { 1197 if ((str = url_encode(clt->clt_remote_user)) 1198 == NULL) 1199 return (NULL); 1200 } else 1201 str = strdup(""); 1202 ret = expand_string(buf, len, "$REMOTE_USER", str); 1203 free(str); 1204 if (ret != 0) 1205 return (NULL); 1206 } 1207 } 1208 if (strstr(val, "$REQUEST_URI") != NULL) { 1209 if ((path = url_encode(desc->http_path)) == NULL) 1210 return (NULL); 1211 if (desc->http_query == NULL) { 1212 str = path; 1213 } else { 1214 ret = asprintf(&str, "%s?%s", path, desc->http_query); 1215 free(path); 1216 if (ret == -1) 1217 return (NULL); 1218 } 1219 1220 ret = expand_string(buf, len, "$REQUEST_URI", str); 1221 free(str); 1222 if (ret != 0) 1223 return (NULL); 1224 } 1225 if (strstr(val, "$REQUEST_SCHEME") != NULL) { 1226 if (srv_conf->flags & SRVFLAG_TLS) { 1227 ret = expand_string(buf, len, "$REQUEST_SCHEME", "https"); 1228 } else { 1229 ret = expand_string(buf, len, "$REQUEST_SCHEME", "http"); 1230 } 1231 if (ret != 0) 1232 return (NULL); 1233 } 1234 if (strstr(val, "$SERVER_") != NULL) { 1235 if (strstr(val, "$SERVER_ADDR") != NULL) { 1236 if (print_host(&srv_conf->ss, 1237 ibuf, sizeof(ibuf)) == NULL) 1238 return (NULL); 1239 if (expand_string(buf, len, 1240 "$SERVER_ADDR", ibuf) != 0) 1241 return (NULL); 1242 } 1243 if (strstr(val, "$SERVER_PORT") != NULL) { 1244 snprintf(ibuf, sizeof(ibuf), "%u", 1245 ntohs(srv_conf->port)); 1246 if (expand_string(buf, len, 1247 "$SERVER_PORT", ibuf) != 0) 1248 return (NULL); 1249 } 1250 if (strstr(val, "$SERVER_NAME") != NULL) { 1251 if ((str = url_encode(srv_conf->name)) 1252 == NULL) 1253 return (NULL); 1254 ret = expand_string(buf, len, "$SERVER_NAME", str); 1255 free(str); 1256 if (ret != 0) 1257 return (NULL); 1258 } 1259 } 1260 1261 return (buf); 1262 } 1263 1264 int 1265 server_response(struct httpd *httpd, struct client *clt) 1266 { 1267 char path[PATH_MAX]; 1268 char hostname[HOST_NAME_MAX+1]; 1269 struct http_descriptor *desc = clt->clt_descreq; 1270 struct http_descriptor *resp = clt->clt_descresp; 1271 struct server *srv = clt->clt_srv; 1272 struct server_config *srv_conf = &srv->srv_conf; 1273 struct kv *kv, key, *host; 1274 struct str_find sm; 1275 int portval = -1, ret; 1276 char *hostval, *query; 1277 const char *errstr = NULL; 1278 1279 /* Preserve original path */ 1280 if (desc->http_path == NULL || 1281 (desc->http_path_orig = strdup(desc->http_path)) == NULL) 1282 goto fail; 1283 1284 /* Decode the URL */ 1285 if (url_decode(desc->http_path) == NULL) 1286 goto fail; 1287 1288 /* Canonicalize the request path */ 1289 if (canonicalize_path(desc->http_path, path, sizeof(path)) == NULL) 1290 goto fail; 1291 free(desc->http_path); 1292 if ((desc->http_path = strdup(path)) == NULL) 1293 goto fail; 1294 1295 key.kv_key = "Host"; 1296 if ((host = kv_find(&desc->http_headers, &key)) != NULL && 1297 host->kv_value == NULL) 1298 host = NULL; 1299 1300 if (strcmp(desc->http_version, "HTTP/1.1") == 0) { 1301 /* Host header is mandatory */ 1302 if (host == NULL) 1303 goto fail; 1304 1305 /* Is the connection persistent? */ 1306 key.kv_key = "Connection"; 1307 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 1308 strcasecmp("close", kv->kv_value) == 0) 1309 clt->clt_persist = 0; 1310 else 1311 clt->clt_persist++; 1312 } else { 1313 /* Is the connection persistent? */ 1314 key.kv_key = "Connection"; 1315 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 1316 strcasecmp("keep-alive", kv->kv_value) == 0) 1317 clt->clt_persist++; 1318 else 1319 clt->clt_persist = 0; 1320 } 1321 1322 /* 1323 * Do we have a Host header and matching configuration? 1324 * XXX the Host can also appear in the URL path. 1325 */ 1326 if (host != NULL) { 1327 if ((hostval = server_http_parsehost(host->kv_value, 1328 hostname, sizeof(hostname), &portval)) == NULL) 1329 goto fail; 1330 1331 TAILQ_FOREACH(srv_conf, &srv->srv_hosts, entry) { 1332 #ifdef DEBUG 1333 if ((srv_conf->flags & SRVFLAG_LOCATION) == 0) { 1334 DPRINTF("%s: virtual host \"%s:%u\"" 1335 " host \"%s\" (\"%s\")", 1336 __func__, srv_conf->name, 1337 ntohs(srv_conf->port), host->kv_value, 1338 hostname); 1339 } 1340 #endif 1341 if (srv_conf->flags & SRVFLAG_LOCATION) 1342 continue; 1343 else if (srv_conf->flags & SRVFLAG_SERVER_MATCH) { 1344 str_find(hostname, srv_conf->name, 1345 &sm, 1, &errstr); 1346 ret = errstr == NULL ? 0 : -1; 1347 } else { 1348 ret = fnmatch(srv_conf->name, 1349 hostname, FNM_CASEFOLD); 1350 } 1351 if (ret == 0 && 1352 (portval == -1 || portval == srv_conf->port)) { 1353 /* Replace host configuration */ 1354 clt->clt_srv_conf = srv_conf; 1355 srv_conf = NULL; 1356 break; 1357 } 1358 } 1359 } 1360 1361 if (srv_conf != NULL) { 1362 /* Use the actual server IP address */ 1363 if (server_http_host(&clt->clt_srv_ss, hostname, 1364 sizeof(hostname)) == NULL) 1365 goto fail; 1366 } else { 1367 /* Host header was valid and found */ 1368 if (strlcpy(hostname, host->kv_value, sizeof(hostname)) >= 1369 sizeof(hostname)) 1370 goto fail; 1371 srv_conf = clt->clt_srv_conf; 1372 } 1373 1374 if (clt->clt_persist >= srv_conf->maxrequests) 1375 clt->clt_persist = 0; 1376 1377 /* pipelining should end after the first "idempotent" method */ 1378 if (clt->clt_pipelining && clt->clt_toread > 0) 1379 clt->clt_persist = 0; 1380 1381 if ((desc->http_host = strdup(hostname)) == NULL) 1382 goto fail; 1383 1384 /* Now fill in the mandatory parts of the response descriptor */ 1385 resp->http_method = desc->http_method; 1386 if ((resp->http_version = strdup(desc->http_version)) == NULL) 1387 goto fail; 1388 1389 /* Now search for the location */ 1390 if ((srv_conf = server_getlocation(clt, desc->http_path)) == NULL) { 1391 server_abort_http(clt, 500, desc->http_path); 1392 return (-1); 1393 } 1394 1395 /* Optional rewrite */ 1396 if (srv_conf->flags & SRVFLAG_PATH_REWRITE) { 1397 /* Expand macros */ 1398 if (server_expand_http(clt, srv_conf->path, 1399 path, sizeof(path)) == NULL) 1400 goto fail; 1401 1402 /* 1403 * Reset and update the query. The updated query must already 1404 * be URL encoded - either specified by the user or by using the 1405 * original $QUERY_STRING. 1406 */ 1407 free(desc->http_query_alias); 1408 desc->http_query_alias = NULL; 1409 if ((query = strchr(path, '?')) != NULL) { 1410 *query++ = '\0'; 1411 if ((desc->http_query_alias = strdup(query)) == NULL) 1412 goto fail; 1413 } 1414 1415 /* Canonicalize the updated request path */ 1416 if (canonicalize_path(path, 1417 path, sizeof(path)) == NULL) 1418 goto fail; 1419 1420 log_debug("%s: rewrote %s?%s -> %s?%s", __func__, 1421 desc->http_path, desc->http_query ? desc->http_query : "", 1422 path, query ? query : ""); 1423 1424 free(desc->http_path_alias); 1425 if ((desc->http_path_alias = strdup(path)) == NULL) 1426 goto fail; 1427 1428 /* Now search for the updated location */ 1429 if ((srv_conf = server_getlocation(clt, 1430 desc->http_path_alias)) == NULL) { 1431 server_abort_http(clt, 500, desc->http_path_alias); 1432 return (-1); 1433 } 1434 } 1435 1436 if (clt->clt_toread > 0 && (size_t)clt->clt_toread > 1437 srv_conf->maxrequestbody) { 1438 server_abort_http(clt, 413, "request body too large"); 1439 return (-1); 1440 } 1441 1442 if (srv_conf->flags & SRVFLAG_BLOCK) { 1443 server_abort_http(clt, srv_conf->return_code, 1444 srv_conf->return_uri); 1445 return (-1); 1446 } else if (srv_conf->flags & SRVFLAG_AUTH && 1447 server_http_authenticate(srv_conf, clt) == -1) { 1448 server_abort_http(clt, 401, srv_conf->auth_realm); 1449 return (-1); 1450 } else 1451 return (server_file(httpd, clt)); 1452 fail: 1453 server_abort_http(clt, 400, "bad request"); 1454 return (-1); 1455 } 1456 1457 const char * 1458 server_root_strip(const char *path, int n) 1459 { 1460 const char *p; 1461 1462 /* Strip strip leading directories. Leading '/' is ignored. */ 1463 for (; n > 0 && *path != '\0'; n--) 1464 if ((p = strchr(++path, '/')) == NULL) 1465 path = strchr(path, '\0'); 1466 else 1467 path = p; 1468 1469 return (path); 1470 } 1471 1472 struct server_config * 1473 server_getlocation(struct client *clt, const char *path) 1474 { 1475 struct server *srv = clt->clt_srv; 1476 struct server_config *srv_conf = clt->clt_srv_conf, *location; 1477 const char *errstr = NULL; 1478 int ret; 1479 1480 /* Now search for the location */ 1481 TAILQ_FOREACH(location, &srv->srv_hosts, entry) { 1482 #ifdef DEBUG 1483 if (location->flags & SRVFLAG_LOCATION) { 1484 DPRINTF("%s: location \"%s\" path \"%s\"", 1485 __func__, location->location, path); 1486 } 1487 #endif 1488 if ((location->flags & SRVFLAG_LOCATION) && 1489 location->parent_id == srv_conf->parent_id) { 1490 errstr = NULL; 1491 if (location->flags & SRVFLAG_LOCATION_MATCH) { 1492 ret = str_match(path, location->location, 1493 &clt->clt_srv_match, &errstr); 1494 } else { 1495 ret = fnmatch(location->location, 1496 path, FNM_CASEFOLD); 1497 } 1498 if (ret == 0 && errstr == NULL) { 1499 if ((ret = server_locationaccesstest(location, 1500 path)) == -1) 1501 return (NULL); 1502 1503 if (ret) 1504 continue; 1505 /* Replace host configuration */ 1506 clt->clt_srv_conf = srv_conf = location; 1507 break; 1508 } 1509 } 1510 } 1511 1512 return (srv_conf); 1513 } 1514 1515 int 1516 server_locationaccesstest(struct server_config *srv_conf, const char *path) 1517 { 1518 int rootfd, ret; 1519 struct stat sb; 1520 1521 if (((SRVFLAG_LOCATION_FOUND | SRVFLAG_LOCATION_NOT_FOUND) & 1522 srv_conf->flags) == 0) 1523 return (0); 1524 1525 if ((rootfd = open(srv_conf->root, O_RDONLY)) == -1) 1526 return (-1); 1527 1528 path = server_root_strip(path, srv_conf->strip) + 1; 1529 if ((ret = faccessat(rootfd, path, R_OK, 0)) != -1) 1530 ret = fstatat(rootfd, path, &sb, 0); 1531 close(rootfd); 1532 return ((ret == -1 && SRVFLAG_LOCATION_FOUND & srv_conf->flags) || 1533 (ret == 0 && SRVFLAG_LOCATION_NOT_FOUND & srv_conf->flags)); 1534 } 1535 1536 int 1537 server_response_http(struct client *clt, unsigned int code, 1538 struct media_type *media, off_t size, time_t mtime) 1539 { 1540 struct server_config *srv_conf = clt->clt_srv_conf; 1541 struct http_descriptor *desc = clt->clt_descreq; 1542 struct http_descriptor *resp = clt->clt_descresp; 1543 const char *error; 1544 struct kv *ct, *cl; 1545 char tmbuf[32]; 1546 1547 if (desc == NULL || media == NULL || 1548 (error = server_httperror_byid(code)) == NULL) 1549 return (-1); 1550 1551 if (server_log_http(clt, code, size >= 0 ? size : 0) == -1) 1552 return (-1); 1553 1554 /* Add error codes */ 1555 if (kv_setkey(&resp->http_pathquery, "%u", code) == -1 || 1556 kv_set(&resp->http_pathquery, "%s", error) == -1) 1557 return (-1); 1558 1559 /* Add headers */ 1560 if (kv_add(&resp->http_headers, "Server", HTTPD_SERVERNAME) == NULL) 1561 return (-1); 1562 1563 /* Is it a persistent connection? */ 1564 if (clt->clt_persist) { 1565 if (kv_add(&resp->http_headers, 1566 "Connection", "keep-alive") == NULL) 1567 return (-1); 1568 } else if (kv_add(&resp->http_headers, "Connection", "close") == NULL) 1569 return (-1); 1570 1571 /* Set media type */ 1572 if ((ct = kv_add(&resp->http_headers, "Content-Type", NULL)) == NULL || 1573 kv_set(ct, "%s/%s", media->media_type, media->media_subtype) == -1) 1574 return (-1); 1575 1576 /* Set content length, if specified */ 1577 if (size >= 0 && ((cl = 1578 kv_add(&resp->http_headers, "Content-Length", NULL)) == NULL || 1579 kv_set(cl, "%lld", (long long)size) == -1)) 1580 return (-1); 1581 1582 /* Set last modification time */ 1583 if (server_http_time(mtime, tmbuf, sizeof(tmbuf)) <= 0 || 1584 kv_add(&resp->http_headers, "Last-Modified", tmbuf) == NULL) 1585 return (-1); 1586 1587 /* HSTS header */ 1588 if (srv_conf->flags & SRVFLAG_SERVER_HSTS && 1589 srv_conf->flags & SRVFLAG_TLS) { 1590 if ((cl = 1591 kv_add(&resp->http_headers, "Strict-Transport-Security", 1592 NULL)) == NULL || 1593 kv_set(cl, "max-age=%d%s%s", srv_conf->hsts_max_age, 1594 srv_conf->hsts_flags & HSTSFLAG_SUBDOMAINS ? 1595 "; includeSubDomains" : "", 1596 srv_conf->hsts_flags & HSTSFLAG_PRELOAD ? 1597 "; preload" : "") == -1) 1598 return (-1); 1599 } 1600 1601 /* Date header is mandatory and should be added as late as possible */ 1602 if (server_http_time(time(NULL), tmbuf, sizeof(tmbuf)) <= 0 || 1603 kv_add(&resp->http_headers, "Date", tmbuf) == NULL) 1604 return (-1); 1605 1606 /* Write completed header */ 1607 if (server_writeresponse_http(clt) == -1 || 1608 server_bufferevent_print(clt, "\r\n") == -1 || 1609 server_headers(clt, resp, server_writeheader_http, NULL) == -1 || 1610 server_bufferevent_print(clt, "\r\n") == -1) 1611 return (-1); 1612 1613 if (size <= 0 || resp->http_method == HTTP_METHOD_HEAD) { 1614 bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE); 1615 if (clt->clt_persist) 1616 clt->clt_toread = TOREAD_HTTP_HEADER; 1617 else 1618 clt->clt_toread = TOREAD_HTTP_NONE; 1619 clt->clt_done = 0; 1620 return (0); 1621 } 1622 1623 return (1); 1624 } 1625 1626 int 1627 server_writeresponse_http(struct client *clt) 1628 { 1629 struct http_descriptor *desc = clt->clt_descresp; 1630 1631 DPRINTF("version: %s rescode: %s resmsg: %s", desc->http_version, 1632 desc->http_rescode, desc->http_resmesg); 1633 1634 if (server_bufferevent_print(clt, desc->http_version) == -1 || 1635 server_bufferevent_print(clt, " ") == -1 || 1636 server_bufferevent_print(clt, desc->http_rescode) == -1 || 1637 server_bufferevent_print(clt, " ") == -1 || 1638 server_bufferevent_print(clt, desc->http_resmesg) == -1) 1639 return (-1); 1640 1641 return (0); 1642 } 1643 1644 int 1645 server_writeheader_http(struct client *clt, struct kv *hdr, void *arg) 1646 { 1647 char *ptr; 1648 const char *key; 1649 1650 /* The key might have been updated in the parent */ 1651 if (hdr->kv_parent != NULL && hdr->kv_parent->kv_key != NULL) 1652 key = hdr->kv_parent->kv_key; 1653 else 1654 key = hdr->kv_key; 1655 1656 ptr = hdr->kv_value; 1657 if (server_bufferevent_print(clt, key) == -1 || 1658 (ptr != NULL && 1659 (server_bufferevent_print(clt, ": ") == -1 || 1660 server_bufferevent_print(clt, ptr) == -1 || 1661 server_bufferevent_print(clt, "\r\n") == -1))) 1662 return (-1); 1663 DPRINTF("%s: %s: %s", __func__, key, 1664 hdr->kv_value == NULL ? "" : hdr->kv_value); 1665 1666 return (0); 1667 } 1668 1669 int 1670 server_headers(struct client *clt, void *descp, 1671 int (*hdr_cb)(struct client *, struct kv *, void *), void *arg) 1672 { 1673 struct kv *hdr, *kv; 1674 struct http_descriptor *desc = descp; 1675 1676 RB_FOREACH(hdr, kvtree, &desc->http_headers) { 1677 if ((hdr_cb)(clt, hdr, arg) == -1) 1678 return (-1); 1679 TAILQ_FOREACH(kv, &hdr->kv_children, kv_entry) { 1680 if ((hdr_cb)(clt, kv, arg) == -1) 1681 return (-1); 1682 } 1683 } 1684 1685 return (0); 1686 } 1687 1688 enum httpmethod 1689 server_httpmethod_byname(const char *name) 1690 { 1691 enum httpmethod id = HTTP_METHOD_NONE; 1692 struct http_method method, *res = NULL; 1693 1694 /* Set up key */ 1695 method.method_name = name; 1696 1697 if ((res = bsearch(&method, http_methods, 1698 sizeof(http_methods) / sizeof(http_methods[0]) - 1, 1699 sizeof(http_methods[0]), server_httpmethod_cmp)) != NULL) 1700 id = res->method_id; 1701 1702 return (id); 1703 } 1704 1705 const char * 1706 server_httpmethod_byid(unsigned int id) 1707 { 1708 const char *name = "<UNKNOWN>"; 1709 int i; 1710 1711 for (i = 0; http_methods[i].method_name != NULL; i++) { 1712 if (http_methods[i].method_id == id) { 1713 name = http_methods[i].method_name; 1714 break; 1715 } 1716 } 1717 1718 return (name); 1719 } 1720 1721 static int 1722 server_httpmethod_cmp(const void *a, const void *b) 1723 { 1724 const struct http_method *ma = a; 1725 const struct http_method *mb = b; 1726 1727 /* 1728 * RFC 2616 section 5.1.1 says that the method is case 1729 * sensitive so we don't do a strcasecmp here. 1730 */ 1731 return (strcmp(ma->method_name, mb->method_name)); 1732 } 1733 1734 const char * 1735 server_httperror_byid(unsigned int id) 1736 { 1737 struct http_error error, *res; 1738 1739 /* Set up key */ 1740 error.error_code = (int)id; 1741 1742 if ((res = bsearch(&error, http_errors, 1743 sizeof(http_errors) / sizeof(http_errors[0]) - 1, 1744 sizeof(http_errors[0]), server_httperror_cmp)) != NULL) 1745 return (res->error_name); 1746 1747 return (NULL); 1748 } 1749 1750 static int 1751 server_httperror_cmp(const void *a, const void *b) 1752 { 1753 const struct http_error *ea = a; 1754 const struct http_error *eb = b; 1755 return (ea->error_code - eb->error_code); 1756 } 1757 1758 /* 1759 * return -1 on failure, strlen() of read file otherwise. 1760 * body is NULL on failure, contents of file with trailing \0 otherwise. 1761 */ 1762 char * 1763 read_errdoc(const char *root, const char *file) 1764 { 1765 struct stat sb; 1766 char *path; 1767 int fd; 1768 char *ret = NULL; 1769 1770 if (asprintf(&path, "%s/%s.html", root, file) == -1) 1771 fatal("asprintf"); 1772 if ((fd = open(path, O_RDONLY)) == -1) { 1773 free(path); 1774 log_warn("%s: open", __func__); 1775 return (NULL); 1776 } 1777 free(path); 1778 if (fstat(fd, &sb) < 0) { 1779 log_warn("%s: stat", __func__); 1780 return (NULL); 1781 } 1782 1783 if ((ret = calloc(1, sb.st_size + 1)) == NULL) 1784 fatal("calloc"); 1785 if (sb.st_size == 0) 1786 return (ret); 1787 if (read(fd, ret, sb.st_size) != sb.st_size) { 1788 log_warn("%s: read", __func__); 1789 close(fd); 1790 free(ret); 1791 ret = NULL; 1792 return (ret); 1793 } 1794 close(fd); 1795 1796 return (ret); 1797 } 1798 1799 char * 1800 replace_var(char *str, const char *var, const char *repl) 1801 { 1802 char *iv, *r; 1803 size_t vlen; 1804 1805 vlen = strlen(var); 1806 while ((iv = strstr(str, var)) != NULL) { 1807 *iv = '\0'; 1808 if (asprintf(&r, "%s%s%s", str, repl, &iv[vlen]) == -1) 1809 fatal("asprintf"); 1810 free(str); 1811 str = r; 1812 } 1813 return (str); 1814 } 1815 1816 int 1817 server_log_http(struct client *clt, unsigned int code, size_t len) 1818 { 1819 static char tstamp[64]; 1820 static char ip[INET6_ADDRSTRLEN]; 1821 time_t t; 1822 struct kv key, *agent, *referrer, *xff, *xfp; 1823 struct tm *tm; 1824 struct server_config *srv_conf; 1825 struct http_descriptor *desc; 1826 int ret = -1; 1827 char *user = NULL; 1828 char *path = NULL; 1829 char *version = NULL; 1830 char *referrer_v = NULL; 1831 char *agent_v = NULL; 1832 char *xff_v = NULL; 1833 char *xfp_v = NULL; 1834 1835 if ((srv_conf = clt->clt_srv_conf) == NULL) 1836 return (-1); 1837 if ((srv_conf->flags & SRVFLAG_LOG) == 0) 1838 return (0); 1839 if ((desc = clt->clt_descreq) == NULL) 1840 return (-1); 1841 1842 if ((t = time(NULL)) == -1) 1843 return (-1); 1844 if ((tm = localtime(&t)) == NULL) 1845 return (-1); 1846 if (strftime(tstamp, sizeof(tstamp), "%d/%b/%Y:%H:%M:%S %z", tm) == 0) 1847 return (-1); 1848 1849 if (print_host(&clt->clt_ss, ip, sizeof(ip)) == NULL) 1850 return (-1); 1851 1852 /* 1853 * For details on common log format, see: 1854 * https://httpd.apache.org/docs/current/mod/mod_log_config.html 1855 * 1856 * httpd's format is similar to these Apache LogFormats: 1857 * "%v %h %l %u %t \"%r\" %>s %B" 1858 * "%v %h %l %u %t \"%r\" %>s %B \"%{Referer}i\" \"%{User-agent}i\"" 1859 */ 1860 switch (srv_conf->logformat) { 1861 case LOG_FORMAT_COMMON: 1862 /* Use vis to encode input values from the header */ 1863 if (clt->clt_remote_user && 1864 stravis(&user, clt->clt_remote_user, HTTPD_LOGVIS) == -1) 1865 goto done; 1866 if (desc->http_version && 1867 stravis(&version, desc->http_version, HTTPD_LOGVIS) == -1) 1868 goto done; 1869 1870 /* The following should be URL-encoded */ 1871 if (desc->http_path && 1872 (path = url_encode(desc->http_path)) == NULL) 1873 goto done; 1874 1875 ret = evbuffer_add_printf(clt->clt_log, 1876 "%s %s - %s [%s] \"%s %s%s%s%s%s\" %03d %zu\n", 1877 srv_conf->name, ip, clt->clt_remote_user == NULL ? "-" : 1878 user, tstamp, 1879 server_httpmethod_byid(desc->http_method), 1880 desc->http_path == NULL ? "" : path, 1881 desc->http_query == NULL ? "" : "?", 1882 desc->http_query == NULL ? "" : desc->http_query, 1883 desc->http_version == NULL ? "" : " ", 1884 desc->http_version == NULL ? "" : version, 1885 code, len); 1886 1887 break; 1888 1889 case LOG_FORMAT_COMBINED: 1890 case LOG_FORMAT_FORWARDED: 1891 key.kv_key = "Referer"; /* sic */ 1892 if ((referrer = kv_find(&desc->http_headers, &key)) != NULL && 1893 referrer->kv_value == NULL) 1894 referrer = NULL; 1895 1896 key.kv_key = "User-Agent"; 1897 if ((agent = kv_find(&desc->http_headers, &key)) != NULL && 1898 agent->kv_value == NULL) 1899 agent = NULL; 1900 1901 /* Use vis to encode input values from the header */ 1902 if (clt->clt_remote_user && 1903 stravis(&user, clt->clt_remote_user, HTTPD_LOGVIS) == -1) 1904 goto done; 1905 if (clt->clt_remote_user == NULL && 1906 clt->clt_tls_ctx != NULL && 1907 (srv_conf->tls_flags & TLSFLAG_CA) && 1908 tls_peer_cert_subject(clt->clt_tls_ctx) != NULL && 1909 stravis(&user, tls_peer_cert_subject(clt->clt_tls_ctx), 1910 HTTPD_LOGVIS) == -1) 1911 goto done; 1912 if (desc->http_version && 1913 stravis(&version, desc->http_version, HTTPD_LOGVIS) == -1) 1914 goto done; 1915 if (agent && 1916 stravis(&agent_v, agent->kv_value, HTTPD_LOGVIS) == -1) 1917 goto done; 1918 1919 /* The following should be URL-encoded */ 1920 if (desc->http_path && 1921 (path = url_encode(desc->http_path)) == NULL) 1922 goto done; 1923 if (referrer && 1924 (referrer_v = url_encode(referrer->kv_value)) == NULL) 1925 goto done; 1926 1927 if ((ret = evbuffer_add_printf(clt->clt_log, 1928 "%s %s - %s [%s] \"%s %s%s%s%s%s\"" 1929 " %03d %zu \"%s\" \"%s\"", 1930 srv_conf->name, ip, user == NULL ? "-" : 1931 user, tstamp, 1932 server_httpmethod_byid(desc->http_method), 1933 desc->http_path == NULL ? "" : path, 1934 desc->http_query == NULL ? "" : "?", 1935 desc->http_query == NULL ? "" : desc->http_query, 1936 desc->http_version == NULL ? "" : " ", 1937 desc->http_version == NULL ? "" : version, 1938 code, len, 1939 referrer == NULL ? "" : referrer_v, 1940 agent == NULL ? "" : agent_v)) == -1) 1941 break; 1942 1943 if (srv_conf->logformat == LOG_FORMAT_COMBINED) 1944 goto finish; 1945 1946 xff = xfp = NULL; 1947 1948 key.kv_key = "X-Forwarded-For"; 1949 if ((xff = kv_find(&desc->http_headers, &key)) != NULL 1950 && xff->kv_value == NULL) 1951 xff = NULL; 1952 1953 if (xff && 1954 stravis(&xff_v, xff->kv_value, HTTPD_LOGVIS) == -1) 1955 goto finish; 1956 1957 key.kv_key = "X-Forwarded-Port"; 1958 if ((xfp = kv_find(&desc->http_headers, &key)) != NULL && 1959 (xfp->kv_value == NULL)) 1960 xfp = NULL; 1961 1962 if (xfp && 1963 stravis(&xfp_v, xfp->kv_value, HTTPD_LOGVIS) == -1) 1964 goto finish; 1965 1966 if ((ret = evbuffer_add_printf(clt->clt_log, " %s %s", 1967 xff == NULL ? "-" : xff_v, 1968 xfp == NULL ? "-" : xfp_v)) == -1) 1969 break; 1970 finish: 1971 ret = evbuffer_add_printf(clt->clt_log, "\n"); 1972 1973 break; 1974 1975 case LOG_FORMAT_CONNECTION: 1976 /* URL-encode the path */ 1977 if (desc->http_path && 1978 (path = url_encode(desc->http_path)) == NULL) 1979 goto done; 1980 1981 ret = evbuffer_add_printf(clt->clt_log, " [%s]", 1982 desc->http_path == NULL ? "" : path); 1983 1984 break; 1985 } 1986 1987 done: 1988 free(user); 1989 free(path); 1990 free(version); 1991 free(referrer_v); 1992 free(agent_v); 1993 free(xff_v); 1994 free(xfp_v); 1995 1996 return (ret); 1997 } 1998