1 /* $OpenBSD: server_fcgi.c,v 1.95 2022/08/15 12:29:17 claudio Exp $ */ 2 3 /* 4 * Copyright (c) 2014 Florian Obser <florian@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/time.h> 21 #include <sys/socket.h> 22 #include <sys/un.h> 23 24 #include <netinet/in.h> 25 #include <arpa/inet.h> 26 27 #include <limits.h> 28 #include <errno.h> 29 #include <stdlib.h> 30 #include <string.h> 31 #include <stdio.h> 32 #include <time.h> 33 #include <ctype.h> 34 #include <event.h> 35 #include <unistd.h> 36 37 #include "httpd.h" 38 #include "http.h" 39 40 #define FCGI_PADDING_SIZE 255 41 #define FCGI_RECORD_SIZE \ 42 (sizeof(struct fcgi_record_header) + FCGI_CONTENT_SIZE + FCGI_PADDING_SIZE) 43 44 #define FCGI_BEGIN_REQUEST 1 45 #define FCGI_ABORT_REQUEST 2 46 #define FCGI_END_REQUEST 3 47 #define FCGI_PARAMS 4 48 #define FCGI_STDIN 5 49 #define FCGI_STDOUT 6 50 #define FCGI_STDERR 7 51 #define FCGI_DATA 8 52 #define FCGI_GET_VALUES 9 53 #define FCGI_GET_VALUES_RESULT 10 54 #define FCGI_UNKNOWN_TYPE 11 55 #define FCGI_MAXTYPE (FCGI_UNKNOWN_TYPE) 56 57 #define FCGI_RESPONDER 1 58 59 struct fcgi_record_header { 60 uint8_t version; 61 uint8_t type; 62 uint16_t id; 63 uint16_t content_len; 64 uint8_t padding_len; 65 uint8_t reserved; 66 } __packed; 67 68 struct fcgi_begin_request_body { 69 uint16_t role; 70 uint8_t flags; 71 uint8_t reserved[5]; 72 } __packed; 73 74 struct server_fcgi_param { 75 int total_len; 76 uint8_t buf[FCGI_RECORD_SIZE]; 77 }; 78 79 int server_fcgi_header(struct client *, unsigned int); 80 void server_fcgi_error(struct bufferevent *, short, void *); 81 void server_fcgi_read(struct bufferevent *, void *); 82 int server_fcgi_writeheader(struct client *, struct kv *, void *); 83 int server_fcgi_writechunk(struct client *); 84 int server_fcgi_getheaders(struct client *); 85 int fcgi_add_param(struct server_fcgi_param *, const char *, const char *, 86 struct client *); 87 88 int 89 server_fcgi(struct httpd *env, struct client *clt) 90 { 91 struct server_fcgi_param param; 92 struct server_config *srv_conf = clt->clt_srv_conf; 93 struct http_descriptor *desc = clt->clt_descreq; 94 struct fcgi_record_header *h; 95 struct fcgi_begin_request_body *begin; 96 struct fastcgi_param *fcgiparam; 97 char hbuf[HOST_NAME_MAX+1]; 98 size_t scriptlen; 99 int pathlen; 100 int fd = -1, ret; 101 const char *stripped, *alias, *errstr = NULL; 102 char *query_alias, *str, *script = NULL; 103 104 if ((fd = socket(srv_conf->fastcgi_ss.ss_family, 105 SOCK_STREAM | SOCK_NONBLOCK, 0)) == -1) 106 goto fail; 107 if ((connect(fd, (struct sockaddr *) &srv_conf->fastcgi_ss, 108 srv_conf->fastcgi_ss.ss_len)) == -1) { 109 if (errno != EINPROGRESS) 110 goto fail; 111 } 112 113 memset(hbuf, 0, sizeof(hbuf)); 114 clt->clt_fcgi.state = FCGI_READ_HEADER; 115 clt->clt_fcgi.toread = sizeof(struct fcgi_record_header); 116 clt->clt_fcgi.status = 200; 117 clt->clt_fcgi.headersdone = 0; 118 clt->clt_fcgi.headerssent = 0; 119 120 if (clt->clt_srvevb != NULL) 121 evbuffer_free(clt->clt_srvevb); 122 123 clt->clt_srvevb = evbuffer_new(); 124 if (clt->clt_srvevb == NULL) { 125 errstr = "failed to allocate evbuffer"; 126 goto fail; 127 } 128 129 close(clt->clt_fd); 130 clt->clt_fd = fd; 131 132 if (clt->clt_srvbev != NULL) 133 bufferevent_free(clt->clt_srvbev); 134 135 clt->clt_srvbev_throttled = 0; 136 clt->clt_srvbev = bufferevent_new(fd, server_fcgi_read, 137 NULL, server_fcgi_error, clt); 138 if (clt->clt_srvbev == NULL) { 139 errstr = "failed to allocate fcgi buffer event"; 140 goto fail; 141 } 142 143 memset(¶m, 0, sizeof(param)); 144 145 h = (struct fcgi_record_header *)¶m.buf; 146 h->version = 1; 147 h->type = FCGI_BEGIN_REQUEST; 148 h->id = htons(1); 149 h->content_len = htons(sizeof(struct fcgi_begin_request_body)); 150 h->padding_len = 0; 151 152 begin = (struct fcgi_begin_request_body *)¶m.buf[sizeof(struct 153 fcgi_record_header)]; 154 begin->role = htons(FCGI_RESPONDER); 155 156 if (bufferevent_write(clt->clt_srvbev, ¶m.buf, 157 sizeof(struct fcgi_record_header) + 158 sizeof(struct fcgi_begin_request_body)) == -1) { 159 errstr = "failed to write to evbuffer"; 160 goto fail; 161 } 162 163 h->type = FCGI_PARAMS; 164 h->content_len = param.total_len = 0; 165 166 alias = desc->http_path_alias != NULL 167 ? desc->http_path_alias 168 : desc->http_path; 169 170 query_alias = desc->http_query_alias != NULL 171 ? desc->http_query_alias 172 : desc->http_query; 173 174 stripped = server_root_strip(alias, srv_conf->strip); 175 if ((pathlen = asprintf(&script, "%s%s", srv_conf->root, stripped)) 176 == -1) { 177 errstr = "failed to get script name"; 178 goto fail; 179 } 180 181 scriptlen = path_info(script); 182 /* 183 * no part of root should show up in PATH_INFO. 184 * therefore scriptlen should be >= strlen(root) 185 */ 186 if (scriptlen < strlen(srv_conf->root)) 187 scriptlen = strlen(srv_conf->root); 188 if ((int)scriptlen < pathlen) { 189 if (fcgi_add_param(¶m, "PATH_INFO", 190 script + scriptlen, clt) == -1) { 191 errstr = "failed to encode param"; 192 goto fail; 193 } 194 script[scriptlen] = '\0'; 195 } else { 196 /* RFC 3875 mandates that PATH_INFO is empty if not set */ 197 if (fcgi_add_param(¶m, "PATH_INFO", "", clt) == -1) { 198 errstr = "failed to encode param"; 199 goto fail; 200 } 201 } 202 203 /* 204 * calculate length of http SCRIPT_NAME: 205 * add length of stripped prefix, 206 * subtract length of prepended local root 207 */ 208 scriptlen += (stripped - alias) - strlen(srv_conf->root); 209 if ((str = strndup(alias, scriptlen)) == NULL) 210 goto fail; 211 ret = fcgi_add_param(¶m, "SCRIPT_NAME", str, clt); 212 free(str); 213 if (ret == -1) { 214 errstr = "failed to encode param"; 215 goto fail; 216 } 217 if (fcgi_add_param(¶m, "SCRIPT_FILENAME", server_root_strip(script, 218 srv_conf->fcgistrip), clt) == -1) { 219 errstr = "failed to encode param"; 220 goto fail; 221 } 222 223 if (query_alias) { 224 if (fcgi_add_param(¶m, "QUERY_STRING", query_alias, 225 clt) == -1) { 226 errstr = "failed to encode param"; 227 goto fail; 228 } 229 } else if (fcgi_add_param(¶m, "QUERY_STRING", "", clt) == -1) { 230 errstr = "failed to encode param"; 231 goto fail; 232 } 233 234 if (fcgi_add_param(¶m, "DOCUMENT_ROOT", server_root_strip( 235 srv_conf->root, srv_conf->fcgistrip), clt) == -1) { 236 errstr = "failed to encode param"; 237 goto fail; 238 } 239 if (fcgi_add_param(¶m, "DOCUMENT_URI", alias, 240 clt) == -1) { 241 errstr = "failed to encode param"; 242 goto fail; 243 } 244 if (fcgi_add_param(¶m, "GATEWAY_INTERFACE", "CGI/1.1", 245 clt) == -1) { 246 errstr = "failed to encode param"; 247 goto fail; 248 } 249 250 if (srv_conf->flags & SRVFLAG_AUTH) { 251 if (fcgi_add_param(¶m, "REMOTE_USER", 252 clt->clt_remote_user, clt) == -1) { 253 errstr = "failed to encode param"; 254 goto fail; 255 } 256 } 257 258 /* Add HTTP_* headers */ 259 if (server_headers(clt, desc, server_fcgi_writeheader, ¶m) == -1) { 260 errstr = "failed to encode param"; 261 goto fail; 262 } 263 264 if (srv_conf->flags & SRVFLAG_TLS) { 265 if (fcgi_add_param(¶m, "HTTPS", "on", clt) == -1) { 266 errstr = "failed to encode param"; 267 goto fail; 268 } 269 if (srv_conf->tls_flags != 0 && fcgi_add_param(¶m, 270 "TLS_PEER_VERIFY", printb_flags(srv_conf->tls_flags, 271 TLSFLAG_BITS), clt) == -1) { 272 errstr = "failed to encode param"; 273 goto fail; 274 } 275 } 276 277 TAILQ_FOREACH(fcgiparam, &srv_conf->fcgiparams, entry) { 278 if (fcgi_add_param(¶m, fcgiparam->name, fcgiparam->value, 279 clt) == -1) { 280 errstr = "failed to encode param"; 281 goto fail; 282 } 283 } 284 285 (void)print_host(&clt->clt_ss, hbuf, sizeof(hbuf)); 286 if (fcgi_add_param(¶m, "REMOTE_ADDR", hbuf, clt) == -1) { 287 errstr = "failed to encode param"; 288 goto fail; 289 } 290 291 (void)snprintf(hbuf, sizeof(hbuf), "%d", ntohs(clt->clt_port)); 292 if (fcgi_add_param(¶m, "REMOTE_PORT", hbuf, clt) == -1) { 293 errstr = "failed to encode param"; 294 goto fail; 295 } 296 297 if (fcgi_add_param(¶m, "REQUEST_METHOD", 298 server_httpmethod_byid(desc->http_method), clt) == -1) { 299 errstr = "failed to encode param"; 300 goto fail; 301 } 302 303 if (!desc->http_query) { 304 if (fcgi_add_param(¶m, "REQUEST_URI", desc->http_path_orig, 305 clt) == -1) { 306 errstr = "failed to encode param"; 307 goto fail; 308 } 309 } else { 310 if (asprintf(&str, "%s?%s", desc->http_path_orig, 311 desc->http_query) == -1) { 312 errstr = "failed to encode param"; 313 goto fail; 314 } 315 ret = fcgi_add_param(¶m, "REQUEST_URI", str, clt); 316 free(str); 317 if (ret == -1) { 318 errstr = "failed to encode param"; 319 goto fail; 320 } 321 } 322 323 (void)print_host(&clt->clt_srv_ss, hbuf, sizeof(hbuf)); 324 if (fcgi_add_param(¶m, "SERVER_ADDR", hbuf, clt) == -1) { 325 errstr = "failed to encode param"; 326 goto fail; 327 } 328 329 (void)snprintf(hbuf, sizeof(hbuf), "%d", 330 ntohs(server_socket_getport(&clt->clt_srv_ss))); 331 if (fcgi_add_param(¶m, "SERVER_PORT", hbuf, clt) == -1) { 332 errstr = "failed to encode param"; 333 goto fail; 334 } 335 336 if (fcgi_add_param(¶m, "SERVER_NAME", srv_conf->name, 337 clt) == -1) { 338 errstr = "failed to encode param"; 339 goto fail; 340 } 341 342 if (fcgi_add_param(¶m, "SERVER_PROTOCOL", desc->http_version, 343 clt) == -1) { 344 errstr = "failed to encode param"; 345 goto fail; 346 } 347 348 if (fcgi_add_param(¶m, "SERVER_SOFTWARE", HTTPD_SERVERNAME, 349 clt) == -1) { 350 errstr = "failed to encode param"; 351 goto fail; 352 } 353 354 if (param.total_len != 0) { /* send last params record */ 355 if (bufferevent_write(clt->clt_srvbev, ¶m.buf, 356 sizeof(struct fcgi_record_header) + 357 ntohs(h->content_len)) == -1) { 358 errstr = "failed to write to client evbuffer"; 359 goto fail; 360 } 361 } 362 363 /* send "no more params" message */ 364 h->content_len = 0; 365 if (bufferevent_write(clt->clt_srvbev, ¶m.buf, 366 sizeof(struct fcgi_record_header)) == -1) { 367 errstr = "failed to write to client evbuffer"; 368 goto fail; 369 } 370 371 bufferevent_settimeout(clt->clt_srvbev, 372 srv_conf->timeout.tv_sec, srv_conf->timeout.tv_sec); 373 bufferevent_enable(clt->clt_srvbev, EV_READ|EV_WRITE); 374 if (clt->clt_toread != 0) { 375 server_read_httpcontent(clt->clt_bev, clt); 376 bufferevent_enable(clt->clt_bev, EV_READ); 377 } else { 378 bufferevent_disable(clt->clt_bev, EV_READ); 379 fcgi_add_stdin(clt, NULL); 380 } 381 382 if (strcmp(desc->http_version, "HTTP/1.1") == 0) { 383 clt->clt_fcgi.chunked = 1; 384 } else { 385 /* HTTP/1.0 does not support chunked encoding */ 386 clt->clt_fcgi.chunked = 0; 387 clt->clt_persist = 0; 388 } 389 clt->clt_fcgi.end = 0; 390 clt->clt_done = 0; 391 392 free(script); 393 return (0); 394 fail: 395 free(script); 396 if (errstr == NULL) 397 errstr = strerror(errno); 398 if (fd != -1 && clt->clt_fd != fd) 399 close(fd); 400 server_abort_http(clt, 500, errstr); 401 return (-1); 402 } 403 404 int 405 fcgi_add_stdin(struct client *clt, struct evbuffer *evbuf) 406 { 407 struct fcgi_record_header h; 408 409 memset(&h, 0, sizeof(h)); 410 h.version = 1; 411 h.type = FCGI_STDIN; 412 h.id = htons(1); 413 h.padding_len = 0; 414 415 if (evbuf == NULL) { 416 h.content_len = 0; 417 return bufferevent_write(clt->clt_srvbev, &h, 418 sizeof(struct fcgi_record_header)); 419 } else { 420 h.content_len = htons(EVBUFFER_LENGTH(evbuf)); 421 if (bufferevent_write(clt->clt_srvbev, &h, 422 sizeof(struct fcgi_record_header)) == -1) 423 return -1; 424 return bufferevent_write_buffer(clt->clt_srvbev, evbuf); 425 } 426 return (0); 427 } 428 429 int 430 fcgi_add_param(struct server_fcgi_param *p, const char *key, 431 const char *val, struct client *clt) 432 { 433 struct fcgi_record_header *h; 434 int len = 0; 435 int key_len = strlen(key); 436 int val_len = strlen(val); 437 uint8_t *param; 438 439 len += key_len + val_len; 440 len += key_len > 127 ? 4 : 1; 441 len += val_len > 127 ? 4 : 1; 442 443 DPRINTF("%s: %s[%d] => %s[%d], total_len: %d", __func__, key, key_len, 444 val, val_len, p->total_len); 445 446 if (len > FCGI_CONTENT_SIZE) 447 return (-1); 448 449 if (p->total_len + len > FCGI_CONTENT_SIZE) { 450 if (bufferevent_write(clt->clt_srvbev, p->buf, 451 sizeof(struct fcgi_record_header) + p->total_len) == -1) 452 return (-1); 453 p->total_len = 0; 454 } 455 456 h = (struct fcgi_record_header *)p->buf; 457 param = p->buf + sizeof(*h) + p->total_len; 458 459 if (key_len > 127) { 460 *param++ = ((key_len >> 24) & 0xff) | 0x80; 461 *param++ = ((key_len >> 16) & 0xff); 462 *param++ = ((key_len >> 8) & 0xff); 463 *param++ = (key_len & 0xff); 464 } else 465 *param++ = key_len; 466 467 if (val_len > 127) { 468 *param++ = ((val_len >> 24) & 0xff) | 0x80; 469 *param++ = ((val_len >> 16) & 0xff); 470 *param++ = ((val_len >> 8) & 0xff); 471 *param++ = (val_len & 0xff); 472 } else 473 *param++ = val_len; 474 475 memcpy(param, key, key_len); 476 param += key_len; 477 memcpy(param, val, val_len); 478 479 p->total_len += len; 480 481 h->content_len = htons(p->total_len); 482 return (0); 483 } 484 485 void 486 server_fcgi_error(struct bufferevent *bev, short error, void *arg) 487 { 488 struct client *clt = arg; 489 struct http_descriptor *desc = clt->clt_descreq; 490 491 if ((error & EVBUFFER_EOF) && !clt->clt_fcgi.headersdone) { 492 server_abort_http(clt, 500, "malformed or no headers"); 493 return; 494 } 495 496 /* send the end marker if not already */ 497 if (desc->http_method != HTTP_METHOD_HEAD && clt->clt_fcgi.chunked && 498 !clt->clt_fcgi.end++) 499 server_bufferevent_print(clt, "0\r\n\r\n"); 500 501 server_file_error(bev, error, arg); 502 } 503 504 void 505 server_fcgi_read(struct bufferevent *bev, void *arg) 506 { 507 uint8_t buf[FCGI_RECORD_SIZE]; 508 struct client *clt = (struct client *) arg; 509 struct fcgi_record_header *h; 510 size_t len; 511 char *ptr; 512 513 do { 514 len = bufferevent_read(bev, buf, clt->clt_fcgi.toread); 515 if (evbuffer_add(clt->clt_srvevb, buf, len) == -1) { 516 server_abort_http(clt, 500, "short write"); 517 return; 518 } 519 clt->clt_fcgi.toread -= len; 520 DPRINTF("%s: len: %lu toread: %d state: %d type: %d", 521 __func__, len, clt->clt_fcgi.toread, 522 clt->clt_fcgi.state, clt->clt_fcgi.type); 523 524 if (clt->clt_fcgi.toread != 0) 525 return; 526 527 switch (clt->clt_fcgi.state) { 528 case FCGI_READ_HEADER: 529 clt->clt_fcgi.state = FCGI_READ_CONTENT; 530 h = (struct fcgi_record_header *) 531 EVBUFFER_DATA(clt->clt_srvevb); 532 DPRINTF("%s: record header: version %d type %d id %d " 533 "content len %d padding %d", __func__, 534 h->version, h->type, ntohs(h->id), 535 ntohs(h->content_len), h->padding_len); 536 clt->clt_fcgi.type = h->type; 537 clt->clt_fcgi.toread = ntohs(h->content_len); 538 clt->clt_fcgi.padding_len = h->padding_len; 539 evbuffer_drain(clt->clt_srvevb, 540 EVBUFFER_LENGTH(clt->clt_srvevb)); 541 if (clt->clt_fcgi.toread != 0) 542 break; 543 else if (clt->clt_fcgi.type == FCGI_STDOUT && 544 !clt->clt_chunk) { 545 server_abort_http(clt, 500, "empty stdout"); 546 return; 547 } 548 549 /* fallthrough if content_len == 0 */ 550 case FCGI_READ_CONTENT: 551 switch (clt->clt_fcgi.type) { 552 case FCGI_STDERR: 553 if (EVBUFFER_LENGTH(clt->clt_srvevb) > 0 && 554 (ptr = get_string( 555 EVBUFFER_DATA(clt->clt_srvevb), 556 EVBUFFER_LENGTH(clt->clt_srvevb))) 557 != NULL) { 558 server_sendlog(clt->clt_srv_conf, 559 IMSG_LOG_ERROR, "%s", ptr); 560 free(ptr); 561 } 562 break; 563 case FCGI_STDOUT: 564 ++clt->clt_chunk; 565 if (!clt->clt_fcgi.headersdone) { 566 clt->clt_fcgi.headersdone = 567 server_fcgi_getheaders(clt); 568 if (!EVBUFFER_LENGTH(clt->clt_srvevb)) 569 break; 570 } 571 /* FALLTHROUGH */ 572 case FCGI_END_REQUEST: 573 if (clt->clt_fcgi.headersdone && 574 !clt->clt_fcgi.headerssent) { 575 if (server_fcgi_header(clt, 576 clt->clt_fcgi.status) == -1) { 577 server_abort_http(clt, 500, 578 "malformed fcgi headers"); 579 return; 580 } 581 } 582 /* Don't send content for HEAD requests */ 583 if (clt->clt_fcgi.headerssent && 584 clt->clt_descreq->http_method 585 == HTTP_METHOD_HEAD) 586 /* nothing */ ; 587 else if (server_fcgi_writechunk(clt) == -1) { 588 server_abort_http(clt, 500, 589 "encoding error"); 590 return; 591 } 592 if (clt->clt_fcgi.type == FCGI_END_REQUEST) { 593 bufferevent_enable(clt->clt_bev, 594 EV_READ|EV_WRITE); 595 if (clt->clt_persist) 596 clt->clt_toread = 597 TOREAD_HTTP_HEADER; 598 else 599 clt->clt_toread = 600 TOREAD_HTTP_NONE; 601 clt->clt_done = 0; 602 server_reset_http(clt); 603 } 604 break; 605 } 606 evbuffer_drain(clt->clt_srvevb, 607 EVBUFFER_LENGTH(clt->clt_srvevb)); 608 if (!clt->clt_fcgi.padding_len) { 609 clt->clt_fcgi.state = FCGI_READ_HEADER; 610 clt->clt_fcgi.toread = 611 sizeof(struct fcgi_record_header); 612 } else { 613 clt->clt_fcgi.state = FCGI_READ_PADDING; 614 clt->clt_fcgi.toread = 615 clt->clt_fcgi.padding_len; 616 } 617 break; 618 case FCGI_READ_PADDING: 619 evbuffer_drain(clt->clt_srvevb, 620 EVBUFFER_LENGTH(clt->clt_srvevb)); 621 clt->clt_fcgi.state = FCGI_READ_HEADER; 622 clt->clt_fcgi.toread = 623 sizeof(struct fcgi_record_header); 624 break; 625 } 626 } while (len > 0); 627 } 628 629 int 630 server_fcgi_header(struct client *clt, unsigned int code) 631 { 632 struct server_config *srv_conf = clt->clt_srv_conf; 633 struct http_descriptor *desc = clt->clt_descreq; 634 struct http_descriptor *resp = clt->clt_descresp; 635 const char *error; 636 char tmbuf[32]; 637 struct kv *kv, *cl, key; 638 639 clt->clt_fcgi.headerssent = 1; 640 641 if (desc == NULL || (error = server_httperror_byid(code)) == NULL) 642 return (-1); 643 644 if (server_log_http(clt, code, 0) == -1) 645 return (-1); 646 647 /* Add error codes */ 648 if (kv_setkey(&resp->http_pathquery, "%u", code) == -1 || 649 kv_set(&resp->http_pathquery, "%s", error) == -1) 650 return (-1); 651 652 /* Add headers */ 653 if (kv_add(&resp->http_headers, "Server", HTTPD_SERVERNAME) == NULL) 654 return (-1); 655 656 if (clt->clt_fcgi.type == FCGI_END_REQUEST || 657 EVBUFFER_LENGTH(clt->clt_srvevb) == 0) { 658 /* Can't chunk encode an empty body. */ 659 clt->clt_fcgi.chunked = 0; 660 661 /* But then we need a Content-Length unless method is HEAD... */ 662 if (desc->http_method != HTTP_METHOD_HEAD) { 663 key.kv_key = "Content-Length"; 664 if ((kv = kv_find(&resp->http_headers, &key)) == NULL) { 665 if (kv_add(&resp->http_headers, 666 "Content-Length", "0") == NULL) 667 return (-1); 668 } 669 } 670 } 671 672 /* Send chunked encoding header */ 673 if (clt->clt_fcgi.chunked) { 674 /* but only if no Content-Length header is supplied */ 675 key.kv_key = "Content-Length"; 676 if ((kv = kv_find(&resp->http_headers, &key)) != NULL) { 677 clt->clt_fcgi.chunked = 0; 678 } else { 679 /* 680 * XXX What if the FastCGI added some kind of 681 * Transfer-Encoding, like gzip, deflate or even 682 * "chunked"? 683 */ 684 if (kv_add(&resp->http_headers, 685 "Transfer-Encoding", "chunked") == NULL) 686 return (-1); 687 } 688 } 689 690 /* Is it a persistent connection? */ 691 if (clt->clt_persist) { 692 if (kv_add(&resp->http_headers, 693 "Connection", "keep-alive") == NULL) 694 return (-1); 695 } else if (kv_add(&resp->http_headers, "Connection", "close") == NULL) 696 return (-1); 697 698 /* HSTS header */ 699 if (srv_conf->flags & SRVFLAG_SERVER_HSTS && 700 srv_conf->flags & SRVFLAG_TLS) { 701 if ((cl = 702 kv_add(&resp->http_headers, "Strict-Transport-Security", 703 NULL)) == NULL || 704 kv_set(cl, "max-age=%d%s%s", srv_conf->hsts_max_age, 705 srv_conf->hsts_flags & HSTSFLAG_SUBDOMAINS ? 706 "; includeSubDomains" : "", 707 srv_conf->hsts_flags & HSTSFLAG_PRELOAD ? 708 "; preload" : "") == -1) 709 return (-1); 710 } 711 712 /* Date header is mandatory and should be added as late as possible */ 713 key.kv_key = "Date"; 714 if (kv_find(&resp->http_headers, &key) == NULL && 715 (server_http_time(time(NULL), tmbuf, sizeof(tmbuf)) <= 0 || 716 kv_add(&resp->http_headers, "Date", tmbuf) == NULL)) 717 return (-1); 718 719 if (server_writeresponse_http(clt) == -1 || 720 server_bufferevent_print(clt, "\r\n") == -1 || 721 server_headers(clt, resp, server_writeheader_http, NULL) == -1 || 722 server_bufferevent_print(clt, "\r\n") == -1) 723 return (-1); 724 725 return (0); 726 } 727 728 int 729 server_fcgi_writeheader(struct client *clt, struct kv *hdr, void *arg) 730 { 731 struct server_fcgi_param *param = arg; 732 char *val, *name, *p; 733 const char *key; 734 int ret; 735 736 /* The key might have been updated in the parent */ 737 if (hdr->kv_parent != NULL && hdr->kv_parent->kv_key != NULL) 738 key = hdr->kv_parent->kv_key; 739 else 740 key = hdr->kv_key; 741 742 val = hdr->kv_value; 743 744 if (strcasecmp(key, "Content-Length") == 0 || 745 strcasecmp(key, "Content-Type") == 0) { 746 if ((name = strdup(key)) == NULL) 747 return (-1); 748 } else { 749 if (asprintf(&name, "HTTP_%s", key) == -1) 750 return (-1); 751 } 752 753 /* 754 * RFC 7230 defines a header field-name as a "token" and a "token" 755 * is defined as one or more characters for which isalpha or 756 * isdigit is true plus a list of additional characters. 757 * According to RFC 3875 a CGI environment variable is created 758 * by converting all letters to upper case and replacing '-' 759 * with '_'. 760 */ 761 for (p = name; *p != '\0'; p++) { 762 if (isalpha((unsigned char)*p)) 763 *p = toupper((unsigned char)*p); 764 else if (!(*p == '!' || *p == '#' || *p == '$' || *p == '%' || 765 *p == '&' || *p == '\'' || *p == '*' || *p == '+' || 766 *p == '.' || *p == '^' || *p == '_' || *p == '`' || 767 *p == '|' || *p == '~' || isdigit((unsigned char)*p))) 768 *p = '_'; 769 } 770 771 ret = fcgi_add_param(param, name, val, clt); 772 free(name); 773 774 return (ret); 775 } 776 777 int 778 server_fcgi_writechunk(struct client *clt) 779 { 780 struct evbuffer *evb = clt->clt_srvevb; 781 size_t len; 782 783 if (clt->clt_fcgi.type == FCGI_END_REQUEST) { 784 len = 0; 785 } else 786 len = EVBUFFER_LENGTH(evb); 787 788 if (clt->clt_fcgi.chunked) { 789 /* If len is 0, make sure to write the end marker only once */ 790 if (len == 0 && clt->clt_fcgi.end++) 791 return (0); 792 if (server_bufferevent_printf(clt, "%zx\r\n", len) == -1 || 793 server_bufferevent_write_chunk(clt, evb, len) == -1 || 794 server_bufferevent_print(clt, "\r\n") == -1) 795 return (-1); 796 } else if (len) 797 return (server_bufferevent_write_buffer(clt, evb)); 798 799 return (0); 800 } 801 802 int 803 server_fcgi_getheaders(struct client *clt) 804 { 805 struct http_descriptor *resp = clt->clt_descresp; 806 struct evbuffer *evb = clt->clt_srvevb; 807 int code, ret; 808 char *line, *key, *value; 809 const char *errstr; 810 811 while ((line = evbuffer_getline(evb)) != NULL && *line != '\0') { 812 key = line; 813 814 if ((value = strchr(key, ':')) == NULL) 815 break; 816 817 *value++ = '\0'; 818 value += strspn(value, " \t"); 819 820 DPRINTF("%s: %s: %s", __func__, key, value); 821 822 if (strcasecmp("Status", key) == 0) { 823 value[strcspn(value, " \t")] = '\0'; 824 code = (int)strtonum(value, 100, 600, &errstr); 825 if (errstr != NULL || server_httperror_byid( 826 code) == NULL) 827 code = 200; 828 clt->clt_fcgi.status = code; 829 } else { 830 (void)kv_add(&resp->http_headers, key, value); 831 } 832 free(line); 833 } 834 835 ret = (line != NULL && *line == '\0'); 836 837 free(line); 838 return ret; 839 } 840