server_fcgi.c revision 1.91
1/* $OpenBSD: server_fcgi.c,v 1.91 2022/08/11 14:25:22 op 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 59struct 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 68struct fcgi_begin_request_body { 69 uint16_t role; 70 uint8_t flags; 71 uint8_t reserved[5]; 72} __packed; 73 74struct server_fcgi_param { 75 int total_len; 76 uint8_t buf[FCGI_RECORD_SIZE]; 77}; 78 79int server_fcgi_header(struct client *, unsigned int); 80void server_fcgi_error(struct bufferevent *, short, void *); 81void server_fcgi_read(struct bufferevent *, void *); 82int server_fcgi_writeheader(struct client *, struct kv *, void *); 83int server_fcgi_writechunk(struct client *); 84int server_fcgi_getheaders(struct client *); 85int fcgi_add_param(struct server_fcgi_param *, const char *, const char *, 86 struct client *); 87 88int 89server_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 404int 405fcgi_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 429int 430fcgi_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 485void 486server_fcgi_error(struct bufferevent *bev, short error, void *arg) 487{ 488 struct client *clt = arg; 489 490 if ((error & EVBUFFER_EOF) && !clt->clt_fcgi.headersdone) { 491 server_abort_http(clt, 500, "malformed or no headers"); 492 return; 493 } 494 495 /* send the end marker if not already */ 496 if (clt->clt_fcgi.chunked && !clt->clt_fcgi.end++) 497 server_bufferevent_print(clt, "0\r\n\r\n"); 498 499 server_file_error(bev, error, arg); 500} 501 502void 503server_fcgi_read(struct bufferevent *bev, void *arg) 504{ 505 uint8_t buf[FCGI_RECORD_SIZE]; 506 struct client *clt = (struct client *) arg; 507 struct fcgi_record_header *h; 508 size_t len; 509 char *ptr; 510 511 do { 512 len = bufferevent_read(bev, buf, clt->clt_fcgi.toread); 513 if (evbuffer_add(clt->clt_srvevb, buf, len) == -1) { 514 server_abort_http(clt, 500, "short write"); 515 return; 516 } 517 clt->clt_fcgi.toread -= len; 518 DPRINTF("%s: len: %lu toread: %d state: %d type: %d", 519 __func__, len, clt->clt_fcgi.toread, 520 clt->clt_fcgi.state, clt->clt_fcgi.type); 521 522 if (clt->clt_fcgi.toread != 0) 523 return; 524 525 switch (clt->clt_fcgi.state) { 526 case FCGI_READ_HEADER: 527 clt->clt_fcgi.state = FCGI_READ_CONTENT; 528 h = (struct fcgi_record_header *) 529 EVBUFFER_DATA(clt->clt_srvevb); 530 DPRINTF("%s: record header: version %d type %d id %d " 531 "content len %d padding %d", __func__, 532 h->version, h->type, ntohs(h->id), 533 ntohs(h->content_len), h->padding_len); 534 clt->clt_fcgi.type = h->type; 535 clt->clt_fcgi.toread = ntohs(h->content_len); 536 clt->clt_fcgi.padding_len = h->padding_len; 537 evbuffer_drain(clt->clt_srvevb, 538 EVBUFFER_LENGTH(clt->clt_srvevb)); 539 if (clt->clt_fcgi.toread != 0) 540 break; 541 else if (clt->clt_fcgi.type == FCGI_STDOUT && 542 !clt->clt_chunk) { 543 server_abort_http(clt, 500, "empty stdout"); 544 return; 545 } 546 547 /* fallthrough if content_len == 0 */ 548 case FCGI_READ_CONTENT: 549 switch (clt->clt_fcgi.type) { 550 case FCGI_STDERR: 551 if (EVBUFFER_LENGTH(clt->clt_srvevb) > 0 && 552 (ptr = get_string( 553 EVBUFFER_DATA(clt->clt_srvevb), 554 EVBUFFER_LENGTH(clt->clt_srvevb))) 555 != NULL) { 556 server_sendlog(clt->clt_srv_conf, 557 IMSG_LOG_ERROR, "%s", ptr); 558 free(ptr); 559 } 560 break; 561 case FCGI_STDOUT: 562 ++clt->clt_chunk; 563 if (!clt->clt_fcgi.headersdone) { 564 clt->clt_fcgi.headersdone = 565 server_fcgi_getheaders(clt); 566 if (!EVBUFFER_LENGTH(clt->clt_srvevb)) 567 break; 568 } 569 /* FALLTHROUGH */ 570 case FCGI_END_REQUEST: 571 if (clt->clt_fcgi.headersdone && 572 !clt->clt_fcgi.headerssent) { 573 if (server_fcgi_header(clt, 574 clt->clt_fcgi.status) == -1) { 575 server_abort_http(clt, 500, 576 "malformed fcgi headers"); 577 return; 578 } 579 } 580 /* Don't send content for HEAD requests */ 581 if (clt->clt_fcgi.headerssent && 582 ((struct http_descriptor *) 583 clt->clt_descreq)->http_method 584 == HTTP_METHOD_HEAD) 585 return; 586 if (server_fcgi_writechunk(clt) == -1) { 587 server_abort_http(clt, 500, 588 "encoding error"); 589 return; 590 } 591 break; 592 } 593 evbuffer_drain(clt->clt_srvevb, 594 EVBUFFER_LENGTH(clt->clt_srvevb)); 595 if (!clt->clt_fcgi.padding_len) { 596 clt->clt_fcgi.state = FCGI_READ_HEADER; 597 clt->clt_fcgi.toread = 598 sizeof(struct fcgi_record_header); 599 } else { 600 clt->clt_fcgi.state = FCGI_READ_PADDING; 601 clt->clt_fcgi.toread = 602 clt->clt_fcgi.padding_len; 603 } 604 break; 605 case FCGI_READ_PADDING: 606 evbuffer_drain(clt->clt_srvevb, 607 EVBUFFER_LENGTH(clt->clt_srvevb)); 608 clt->clt_fcgi.state = FCGI_READ_HEADER; 609 clt->clt_fcgi.toread = 610 sizeof(struct fcgi_record_header); 611 break; 612 } 613 } while (len > 0); 614} 615 616int 617server_fcgi_header(struct client *clt, unsigned int code) 618{ 619 struct server_config *srv_conf = clt->clt_srv_conf; 620 struct http_descriptor *desc = clt->clt_descreq; 621 struct http_descriptor *resp = clt->clt_descresp; 622 const char *error; 623 char tmbuf[32]; 624 struct kv *kv, *cl, key; 625 626 clt->clt_fcgi.headerssent = 1; 627 628 if (desc == NULL || (error = server_httperror_byid(code)) == NULL) 629 return (-1); 630 631 if (server_log_http(clt, code, 0) == -1) 632 return (-1); 633 634 /* Add error codes */ 635 if (kv_setkey(&resp->http_pathquery, "%u", code) == -1 || 636 kv_set(&resp->http_pathquery, "%s", error) == -1) 637 return (-1); 638 639 /* Add headers */ 640 if (kv_add(&resp->http_headers, "Server", HTTPD_SERVERNAME) == NULL) 641 return (-1); 642 643 if (clt->clt_fcgi.type == FCGI_END_REQUEST || 644 EVBUFFER_LENGTH(clt->clt_srvevb) == 0) { 645 /* Can't chunk encode an empty body. */ 646 clt->clt_fcgi.chunked = 0; 647 648 /* But then we need a Content-Length unless method is HEAD... */ 649 if (desc->http_method != HTTP_METHOD_HEAD) { 650 key.kv_key = "Content-Length"; 651 if ((kv = kv_find(&resp->http_headers, &key)) == NULL) { 652 if (kv_add(&resp->http_headers, 653 "Content-Length", "0") == NULL) 654 return (-1); 655 } 656 } 657 } 658 659 /* Send chunked encoding header */ 660 if (clt->clt_fcgi.chunked) { 661 /* but only if no Content-Length header is supplied */ 662 key.kv_key = "Content-Length"; 663 if ((kv = kv_find(&resp->http_headers, &key)) != NULL) { 664 clt->clt_fcgi.chunked = 0; 665 } else { 666 /* 667 * XXX What if the FastCGI added some kind of 668 * Transfer-Encoding, like gzip, deflate or even 669 * "chunked"? 670 */ 671 if (kv_add(&resp->http_headers, 672 "Transfer-Encoding", "chunked") == NULL) 673 return (-1); 674 } 675 } 676 677 /* Is it a persistent connection? */ 678 if (clt->clt_persist) { 679 if (kv_add(&resp->http_headers, 680 "Connection", "keep-alive") == NULL) 681 return (-1); 682 } else if (kv_add(&resp->http_headers, "Connection", "close") == NULL) 683 return (-1); 684 685 /* HSTS header */ 686 if (srv_conf->flags & SRVFLAG_SERVER_HSTS && 687 srv_conf->flags & SRVFLAG_TLS) { 688 if ((cl = 689 kv_add(&resp->http_headers, "Strict-Transport-Security", 690 NULL)) == NULL || 691 kv_set(cl, "max-age=%d%s%s", srv_conf->hsts_max_age, 692 srv_conf->hsts_flags & HSTSFLAG_SUBDOMAINS ? 693 "; includeSubDomains" : "", 694 srv_conf->hsts_flags & HSTSFLAG_PRELOAD ? 695 "; preload" : "") == -1) 696 return (-1); 697 } 698 699 /* Date header is mandatory and should be added as late as possible */ 700 key.kv_key = "Date"; 701 if (kv_find(&resp->http_headers, &key) == NULL && 702 (server_http_time(time(NULL), tmbuf, sizeof(tmbuf)) <= 0 || 703 kv_add(&resp->http_headers, "Date", tmbuf) == NULL)) 704 return (-1); 705 706 if (server_writeresponse_http(clt) == -1 || 707 server_bufferevent_print(clt, "\r\n") == -1 || 708 server_headers(clt, resp, server_writeheader_http, NULL) == -1 || 709 server_bufferevent_print(clt, "\r\n") == -1) 710 return (-1); 711 712 return (0); 713} 714 715int 716server_fcgi_writeheader(struct client *clt, struct kv *hdr, void *arg) 717{ 718 struct server_fcgi_param *param = arg; 719 char *val, *name, *p; 720 const char *key; 721 int ret; 722 723 /* The key might have been updated in the parent */ 724 if (hdr->kv_parent != NULL && hdr->kv_parent->kv_key != NULL) 725 key = hdr->kv_parent->kv_key; 726 else 727 key = hdr->kv_key; 728 729 val = hdr->kv_value; 730 731 if (strcasecmp(key, "Content-Length") == 0 || 732 strcasecmp(key, "Content-Type") == 0) { 733 if ((name = strdup(key)) == NULL) 734 return (-1); 735 } else { 736 if (asprintf(&name, "HTTP_%s", key) == -1) 737 return (-1); 738 } 739 740 /* 741 * RFC 7230 defines a header field-name as a "token" and a "token" 742 * is defined as one or more characters for which isalpha or 743 * isdigit is true plus a list of additional characters. 744 * According to RFC 3875 a CGI environment variable is created 745 * by converting all letters to upper case and replacing '-' 746 * with '_'. 747 */ 748 for (p = name; *p != '\0'; p++) { 749 if (isalpha((unsigned char)*p)) 750 *p = toupper((unsigned char)*p); 751 else if (!(*p == '!' || *p == '#' || *p == '$' || *p == '%' || 752 *p == '&' || *p == '\'' || *p == '*' || *p == '+' || 753 *p == '.' || *p == '^' || *p == '_' || *p == '`' || 754 *p == '|' || *p == '~' || isdigit((unsigned char)*p))) 755 *p = '_'; 756 } 757 758 ret = fcgi_add_param(param, name, val, clt); 759 free(name); 760 761 return (ret); 762} 763 764int 765server_fcgi_writechunk(struct client *clt) 766{ 767 struct evbuffer *evb = clt->clt_srvevb; 768 size_t len; 769 770 if (clt->clt_fcgi.type == FCGI_END_REQUEST) { 771 len = 0; 772 } else 773 len = EVBUFFER_LENGTH(evb); 774 775 if (clt->clt_fcgi.chunked) { 776 /* If len is 0, make sure to write the end marker only once */ 777 if (len == 0 && clt->clt_fcgi.end++) 778 return (0); 779 if (server_bufferevent_printf(clt, "%zx\r\n", len) == -1 || 780 server_bufferevent_write_chunk(clt, evb, len) == -1 || 781 server_bufferevent_print(clt, "\r\n") == -1) 782 return (-1); 783 } else if (len) 784 return (server_bufferevent_write_buffer(clt, evb)); 785 786 return (0); 787} 788 789int 790server_fcgi_getheaders(struct client *clt) 791{ 792 struct http_descriptor *resp = clt->clt_descresp; 793 struct evbuffer *evb = clt->clt_srvevb; 794 int code, ret; 795 char *line, *key, *value; 796 const char *errstr; 797 798 while ((line = evbuffer_getline(evb)) != NULL && *line != '\0') { 799 key = line; 800 801 if ((value = strchr(key, ':')) == NULL) 802 break; 803 804 *value++ = '\0'; 805 value += strspn(value, " \t"); 806 807 DPRINTF("%s: %s: %s", __func__, key, value); 808 809 if (strcasecmp("Status", key) == 0) { 810 value[strcspn(value, " \t")] = '\0'; 811 code = (int)strtonum(value, 100, 600, &errstr); 812 if (errstr != NULL || server_httperror_byid( 813 code) == NULL) 814 code = 200; 815 clt->clt_fcgi.status = code; 816 } else { 817 (void)kv_add(&resp->http_headers, key, value); 818 } 819 free(line); 820 } 821 822 ret = (line != NULL && *line == '\0'); 823 824 free(line); 825 return ret; 826} 827