server_fcgi.c revision 1.13
1/* $OpenBSD: server_fcgi.c,v 1.13 2014/08/03 10:38:42 reyk 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/queue.h> 21#include <sys/time.h> 22#include <sys/stat.h> 23#include <sys/socket.h> 24#include <sys/un.h> 25#include <sys/tree.h> 26#include <sys/hash.h> 27 28#include <net/if.h> 29#include <netinet/in_systm.h> 30#include <netinet/in.h> 31#include <netinet/ip.h> 32#include <netinet/tcp.h> 33#include <arpa/inet.h> 34 35#include <errno.h> 36#include <fcntl.h> 37#include <stdlib.h> 38#include <string.h> 39#include <unistd.h> 40#include <stdio.h> 41#include <err.h> 42#include <event.h> 43 44#include <openssl/ssl.h> 45 46#include "httpd.h" 47#include "http.h" 48 49#define FCGI_CONTENT_SIZE 65535 50#define FCGI_PADDING_SIZE 255 51#define FCGI_RECORD_SIZE \ 52 (sizeof(struct fcgi_record_header) + FCGI_CONTENT_SIZE + FCGI_PADDING_SIZE) 53 54#define FCGI_BEGIN_REQUEST 1 55#define FCGI_ABORT_REQUEST 2 56#define FCGI_END_REQUEST 3 57#define FCGI_PARAMS 4 58#define FCGI_STDIN 5 59#define FCGI_STDOUT 6 60#define FCGI_STDERR 7 61#define FCGI_DATA 8 62#define FCGI_GET_VALUES 9 63#define FCGI_GET_VALUES_RESULT 10 64#define FCGI_UNKNOWN_TYPE 11 65#define FCGI_MAXTYPE (FCGI_UNKNOWN_TYPE) 66 67#define FCGI_RESPONDER 1 68 69struct fcgi_record_header { 70 uint8_t version; 71 uint8_t type; 72 uint16_t id; 73 uint16_t content_len; 74 uint8_t padding_len; 75 uint8_t reserved; 76} __packed; 77 78struct fcgi_begin_request_body { 79 uint16_t role; 80 uint8_t flags; 81 uint8_t reserved[5]; 82} __packed; 83 84int server_fcgi_header(struct client *, u_int); 85void server_fcgi_read(struct bufferevent *, void *); 86int fcgi_add_param(uint8_t *, const char *, const char *, int *, 87 struct client *); 88 89int 90server_fcgi(struct httpd *env, struct client *clt) 91{ 92 uint8_t buf[FCGI_RECORD_SIZE]; 93 char hbuf[MAXHOSTNAMELEN]; 94 struct server_config *srv_conf = clt->clt_srv_conf; 95 struct http_descriptor *desc = clt->clt_desc; 96 struct sockaddr_un sun; 97 struct fcgi_record_header *h; 98 struct fcgi_begin_request_body *begin; 99 struct kv *kv, key; 100 size_t len; 101 int fd = -1, total_len; 102 const char *errstr = NULL; 103 char *request_uri, *p; 104 in_port_t port; 105 struct sockaddr_storage ss; 106 107 if (srv_conf->path[0] == ':') { 108 p = srv_conf->path + 1; 109 110 port = strtonum(p, 0, 0xffff, &errstr); 111 if (errstr != NULL) { 112 log_warn("%s: strtonum %s, %s", __func__, p, errstr); 113 goto fail; 114 } 115 memset(&ss, 0, sizeof(ss)); 116 ss.ss_family = AF_INET; 117 ((struct sockaddr_in *) 118 &ss)->sin_addr.s_addr = htonl(INADDR_LOOPBACK); 119 port = htons(port); 120 121 if ((fd = server_socket_connect(&ss, port, srv_conf)) == -1) 122 goto fail; 123 } else { 124 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) 125 goto fail; 126 127 memset(&sun, 0, sizeof(sun)); 128 sun.sun_family = AF_UNIX; 129 len = strlcpy(sun.sun_path, 130 srv_conf->path, sizeof(sun.sun_path)); 131 if (len >= sizeof(sun.sun_path)) { 132 errstr = "socket path to long"; 133 goto fail; 134 } 135 sun.sun_len = len; 136 137 if (connect(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) 138 goto fail; 139 } 140 141 socket_set_blockmode(fd, BM_NONBLOCK); 142 143 memset(&hbuf, 0, sizeof(hbuf)); 144 clt->clt_fcgi_state = FCGI_READ_HEADER; 145 clt->clt_fcgi_toread = sizeof(struct fcgi_record_header); 146 147 if (clt->clt_srvevb != NULL) 148 evbuffer_free(clt->clt_srvevb); 149 150 clt->clt_srvevb = evbuffer_new(); 151 if (clt->clt_srvevb == NULL) { 152 errstr = "failed to allocate evbuffer"; 153 goto fail; 154 } 155 156 clt->clt_fd = fd; 157 if (clt->clt_srvbev != NULL) 158 bufferevent_free(clt->clt_srvbev); 159 160 clt->clt_srvbev = bufferevent_new(fd, server_fcgi_read, 161 NULL, server_file_error, clt); 162 if (clt->clt_srvbev == NULL) { 163 errstr = "failed to allocate fcgi buffer event"; 164 goto fail; 165 } 166 167 memset(&buf, 0, sizeof(buf)); 168 169 h = (struct fcgi_record_header *) &buf; 170 h->version = 1; 171 h->type = FCGI_BEGIN_REQUEST; 172 h->id = htons(1); 173 h->content_len = htons(sizeof(struct fcgi_begin_request_body)); 174 h->padding_len = 0; 175 176 begin = (struct fcgi_begin_request_body *) &buf[sizeof(struct 177 fcgi_record_header)]; 178 begin->role = htons(FCGI_RESPONDER); 179 180 bufferevent_write(clt->clt_srvbev, &buf, 181 sizeof(struct fcgi_record_header) + 182 sizeof(struct fcgi_begin_request_body)); 183 184 h->type = FCGI_PARAMS; 185 h->content_len = total_len = 0; 186 187 if (fcgi_add_param(buf, "SCRIPT_NAME", desc->http_path, &total_len, 188 clt) == -1) { 189 errstr = "failed to encode param"; 190 goto fail; 191 } 192 193 if (desc->http_query) 194 if (fcgi_add_param(buf, "QUERY_STRING", desc->http_query, 195 &total_len, clt) == -1) { 196 errstr = "failed to encode param"; 197 goto fail; 198 } 199 200 if (fcgi_add_param(buf, "DOCUMENT_URI", desc->http_path, &total_len, 201 clt) == -1) { 202 errstr = "failed to encode param"; 203 goto fail; 204 } 205 if (fcgi_add_param(buf, "GATEWAY_INTERFACE", "CGI/1.1", &total_len, 206 clt) == -1) { 207 errstr = "failed to encode param"; 208 goto fail; 209 } 210 211 key.kv_key = "Accept"; 212 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 213 kv->kv_value != NULL) 214 if (fcgi_add_param(buf, "HTTP_ACCEPT", kv->kv_value, 215 &total_len, clt) == -1) { 216 errstr = "failed to encode param"; 217 goto fail; 218 } 219 220 key.kv_key = "Accept-Encoding"; 221 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 222 kv->kv_value != NULL) 223 if (fcgi_add_param(buf, "HTTP_ACCEPT_ENCODING", kv->kv_value, 224 &total_len, clt) == -1) { 225 errstr = "failed to encode param"; 226 goto fail; 227 } 228 229 key.kv_key = "Accept-Language"; 230 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 231 kv->kv_value != NULL) 232 if (fcgi_add_param(buf, "HTTP_ACCEPT_LANGUAGE", kv->kv_value, 233 &total_len, clt) == -1) { 234 errstr = "failed to encode param"; 235 goto fail; 236 } 237 238 key.kv_key = "Connection"; 239 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 240 kv->kv_value != NULL) 241 if (fcgi_add_param(buf, "HTTP_CONNECTION", kv->kv_value, 242 &total_len, clt) == -1) { 243 errstr = "failed to encode param"; 244 goto fail; 245 } 246 247 key.kv_key = "Cookie"; 248 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 249 kv->kv_value != NULL) 250 if (fcgi_add_param(buf, "HTTP_COOKIE", kv->kv_value, 251 &total_len, clt) == -1) { 252 errstr = "failed to encode param"; 253 goto fail; 254 } 255 256 key.kv_key = "Host"; 257 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 258 kv->kv_value != NULL) 259 if (fcgi_add_param(buf, "HTTP_HOST", kv->kv_value, 260 &total_len, clt) == -1) { 261 errstr = "failed to encode param"; 262 goto fail; 263 } 264 265 key.kv_key = "User-Agent"; 266 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 267 kv->kv_value != NULL) 268 if (fcgi_add_param(buf, "HTTP_USER_AGENT", kv->kv_value, 269 &total_len, clt) == -1) { 270 errstr = "failed to encode param"; 271 goto fail; 272 } 273 274 (void)print_host(&clt->clt_ss, hbuf, sizeof(hbuf)); 275 if (fcgi_add_param(buf, "REMOTE_ADDR", hbuf, &total_len, clt) == -1) { 276 errstr = "failed to encode param"; 277 goto fail; 278 } 279 280 (void)snprintf(hbuf, sizeof(hbuf), "%d", ntohs(clt->clt_port)); 281 if (fcgi_add_param(buf, "REMOTE_PORT", hbuf, &total_len, clt) == -1) { 282 errstr = "failed to encode param"; 283 goto fail; 284 } 285 286 if (fcgi_add_param(buf, "REQUEST_METHOD", 287 server_httpmethod_byid(desc->http_method), &total_len, clt) == -1) { 288 errstr = "failed to encode param"; 289 goto fail; 290 } 291 292 if (!desc->http_query) { 293 if (fcgi_add_param(buf, "REQUEST_URI", desc->http_path, 294 &total_len, clt) == -1) { 295 errstr = "failed to encode param"; 296 goto fail; 297 } 298 } else if (asprintf(&request_uri, "%s?%s", desc->http_path, 299 desc->http_query) != -1) { 300 if (fcgi_add_param(buf, "REQUEST_URI", request_uri, &total_len, 301 clt) == -1) { 302 errstr = "failed to encode param"; 303 goto fail; 304 } 305 free(request_uri); 306 } 307 308 (void)print_host(&clt->clt_srv_ss, hbuf, sizeof(hbuf)); 309 if (fcgi_add_param(buf, "SERVER_ADDR", hbuf, &total_len, clt) == -1) { 310 errstr = "failed to encode param"; 311 goto fail; 312 } 313 314 (void)snprintf(hbuf, sizeof(hbuf), "%d", 315 ntohs(server_socket_getport(&clt->clt_srv_ss))); 316 if (fcgi_add_param(buf, "SERVER_PORT", hbuf, &total_len, clt) == -1) { 317 errstr = "failed to encode param"; 318 goto fail; 319 } 320 321 if (fcgi_add_param(buf, "SERVER_NAME", srv_conf->name, &total_len, 322 clt) == -1) { 323 errstr = "failed to encode param"; 324 goto fail; 325 } 326 327 if (fcgi_add_param(buf, "SERVER_PROTOCOL", desc->http_version, 328 &total_len, clt) == -1) { 329 errstr = "failed to encode param"; 330 goto fail; 331 } 332 333 if (fcgi_add_param(buf, "SERVER_SOFTWARE", HTTPD_SERVERNAME, &total_len, 334 clt) == -1) { 335 errstr = "failed to encode param"; 336 goto fail; 337 } 338 339 if (total_len != 0) { /* send last params record */ 340 bufferevent_write(clt->clt_srvbev, &buf, 341 sizeof(struct fcgi_record_header) + 342 ntohs(h->content_len)); 343 } 344 345 /* send "no more params" message */ 346 h->content_len = 0; 347 bufferevent_write(clt->clt_srvbev, &buf, 348 sizeof(struct fcgi_record_header)); 349 350 h->type = FCGI_STDIN; 351 352 bufferevent_write(clt->clt_srvbev, &buf, 353 sizeof(struct fcgi_record_header)); 354 355 bufferevent_settimeout(clt->clt_srvbev, 356 srv_conf->timeout.tv_sec, srv_conf->timeout.tv_sec); 357 bufferevent_enable(clt->clt_srvbev, EV_READ|EV_WRITE); 358 bufferevent_disable(clt->clt_bev, EV_READ); 359 360 /* 361 * persist is not supported yet because we don't get the 362 * Content-Length from slowcgi and don't support chunked encoding. 363 */ 364 clt->clt_persist = 0; 365 clt->clt_done = 0; 366 367 return (0); 368 fail: 369 if (errstr == NULL) 370 errstr = strerror(errno); 371 server_abort_http(clt, 500, errstr); 372 return (-1); 373} 374 375int 376fcgi_add_param(uint8_t *buf, const char *key, const char *val, int *total_len, 377 struct client *clt) 378{ 379 struct fcgi_record_header *h; 380 int len = 0; 381 int key_len = strlen(key); 382 int val_len = strlen(val); 383 uint8_t *param; 384 385 len += key_len + val_len; 386 len += key_len > 127 ? 4 : 1; 387 len += val_len > 127 ? 4 : 1; 388 389 DPRINTF("%s: %s[%d] => %s[%d], total_len: %d", __func__, key, key_len, 390 val, val_len, *total_len); 391 392 if (len > FCGI_CONTENT_SIZE) 393 return (-1); 394 395 if (*total_len + len > FCGI_CONTENT_SIZE) { 396 bufferevent_write(clt->clt_srvbev, buf, 397 sizeof(struct fcgi_record_header) + *total_len); 398 *total_len = 0; 399 } 400 401 h = (struct fcgi_record_header *) buf; 402 param = buf + sizeof(struct fcgi_record_header) + *total_len; 403 404 if (key_len > 127) { 405 *param++ = ((key_len >> 24) & 0xff) | 0x80; 406 *param++ = ((key_len >> 16) & 0xff); 407 *param++ = ((key_len >> 8) & 0xff); 408 *param++ = (key_len & 0xff); 409 } else 410 *param++ = key_len; 411 412 if (val_len > 127) { 413 *param++ = ((val_len >> 24) & 0xff) | 0x80; 414 *param++ = ((val_len >> 16) & 0xff); 415 *param++ = ((val_len >> 8) & 0xff); 416 *param++ = (val_len & 0xff); 417 } else 418 *param++ = val_len; 419 420 memcpy(param, key, key_len); 421 param += key_len; 422 memcpy(param, val, val_len); 423 424 *total_len += len; 425 426 h->content_len = htons(*total_len); 427 return (0); 428} 429 430void 431server_fcgi_read(struct bufferevent *bev, void *arg) 432{ 433 uint8_t buf[FCGI_RECORD_SIZE]; 434 struct client *clt = (struct client *) arg; 435 struct fcgi_record_header *h; 436 size_t len; 437 438 do { 439 len = bufferevent_read(bev, &buf, clt->clt_fcgi_toread); 440 /* XXX error handling */ 441 evbuffer_add(clt->clt_srvevb, &buf, len); 442 clt->clt_fcgi_toread -= len; 443 DPRINTF("%s: len: %lu toread: %d state: %d", __func__, len, 444 clt->clt_fcgi_toread, clt->clt_fcgi_state); 445 446 if (clt->clt_fcgi_toread != 0) 447 return; 448 449 switch (clt->clt_fcgi_state) { 450 case FCGI_READ_HEADER: 451 clt->clt_fcgi_state = FCGI_READ_CONTENT; 452 h = (struct fcgi_record_header *) 453 EVBUFFER_DATA(clt->clt_srvevb); 454 DPRINTF("%s: record header: version %d type %d id %d " 455 "content len %d padding %d", __func__, 456 h->version, h->type, ntohs(h->id), 457 ntohs(h->content_len), h->padding_len); 458 clt->clt_fcgi_type = h->type; 459 clt->clt_fcgi_toread = ntohs(h->content_len); 460 clt->clt_fcgi_padding_len = h->padding_len; 461 evbuffer_drain(clt->clt_srvevb, 462 EVBUFFER_LENGTH(clt->clt_srvevb)); 463 if (clt->clt_fcgi_toread != 0) 464 break; 465 466 /* fallthrough if content_len == 0 */ 467 case FCGI_READ_CONTENT: 468 if (clt->clt_fcgi_type == FCGI_STDOUT && 469 EVBUFFER_LENGTH(clt->clt_srvevb) > 0) { 470 if (++clt->clt_chunk == 1) 471 server_fcgi_header(clt, 200); 472 server_bufferevent_write_buffer(clt, 473 clt->clt_srvevb); 474 } 475 evbuffer_drain(clt->clt_srvevb, 476 EVBUFFER_LENGTH(clt->clt_srvevb)); 477 if (!clt->clt_fcgi_padding_len) { 478 clt->clt_fcgi_state = FCGI_READ_HEADER; 479 clt->clt_fcgi_toread = 480 sizeof(struct fcgi_record_header); 481 } else { 482 clt->clt_fcgi_state = FCGI_READ_PADDING; 483 clt->clt_fcgi_toread = 484 clt->clt_fcgi_padding_len; 485 } 486 break; 487 case FCGI_READ_PADDING: 488 evbuffer_drain(clt->clt_srvevb, 489 EVBUFFER_LENGTH(clt->clt_srvevb)); 490 clt->clt_fcgi_state = FCGI_READ_HEADER; 491 clt->clt_fcgi_toread = 492 sizeof(struct fcgi_record_header); 493 break; 494 } 495 } while (len > 0); 496} 497 498int 499server_fcgi_header(struct client *clt, u_int code) 500{ 501 struct http_descriptor *desc = clt->clt_desc; 502 const char *error; 503 char tmbuf[32]; 504 505 if (desc == NULL || (error = server_httperror_byid(code)) == NULL) 506 return (-1); 507 508 if (server_log_http(clt, code, 0) == -1) 509 return (-1); 510 511 kv_purge(&desc->http_headers); 512 513 /* Add error codes */ 514 if (kv_setkey(&desc->http_pathquery, "%lu", code) == -1 || 515 kv_set(&desc->http_pathquery, "%s", error) == -1) 516 return (-1); 517 518 /* Add headers */ 519 if (kv_add(&desc->http_headers, "Server", HTTPD_SERVERNAME) == NULL) 520 return (-1); 521 522 /* Is it a persistent connection? */ 523 if (clt->clt_persist) { 524 if (kv_add(&desc->http_headers, 525 "Connection", "keep-alive") == NULL) 526 return (-1); 527 } else if (kv_add(&desc->http_headers, "Connection", "close") == NULL) 528 return (-1); 529 530 /* Date header is mandatory and should be added last */ 531 server_http_date(tmbuf, sizeof(tmbuf)); 532 if (kv_add(&desc->http_headers, "Date", tmbuf) == NULL) 533 return (-1); 534 535 /* Write initial header (fcgi might append more) */ 536 if (server_writeresponse_http(clt) == -1 || 537 server_bufferevent_print(clt, "\r\n") == -1 || 538 server_writeheader_http(clt) == -1) 539 return (-1); 540 541 return (0); 542} 543