server_fcgi.c revision 1.9
1/* $OpenBSD: server_fcgi.c,v 1.9 2014/08/02 11:52:01 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 if (clt->clt_srvbev != NULL) 157 bufferevent_free(clt->clt_srvbev); 158 159 clt->clt_srvbev = bufferevent_new(fd, server_fcgi_read, 160 NULL, server_file_error, clt); 161 if (clt->clt_srvbev == NULL) { 162 errstr = "failed to allocate fcgi buffer event"; 163 goto fail; 164 } 165 166 memset(&buf, 0, sizeof(buf)); 167 168 h = (struct fcgi_record_header *) &buf; 169 h->version = 1; 170 h->type = FCGI_BEGIN_REQUEST; 171 h->id = htons(1); 172 h->content_len = htons(sizeof(struct fcgi_begin_request_body)); 173 h->padding_len = 0; 174 175 begin = (struct fcgi_begin_request_body *) &buf[sizeof(struct 176 fcgi_record_header)]; 177 begin->role = htons(FCGI_RESPONDER); 178 179 bufferevent_write(clt->clt_srvbev, &buf, 180 sizeof(struct fcgi_record_header) + 181 sizeof(struct fcgi_begin_request_body)); 182 183 h->type = FCGI_PARAMS; 184 h->content_len = total_len = 0; 185 186 if (fcgi_add_param(buf, "SCRIPT_NAME", desc->http_path, &total_len, 187 clt) == -1) { 188 errstr = "failed to encode param"; 189 goto fail; 190 } 191 192 if (desc->http_query) 193 if (fcgi_add_param(buf, "QUERY_STRING", desc->http_query, 194 &total_len, clt) == -1) { 195 errstr = "failed to encode param"; 196 goto fail; 197 } 198 199 if (fcgi_add_param(buf, "DOCUMENT_URI", desc->http_path, &total_len, 200 clt) == -1) { 201 errstr = "failed to encode param"; 202 goto fail; 203 } 204 if (fcgi_add_param(buf, "GATEWAY_INTERFACE", "CGI/1.1", &total_len, 205 clt) == -1) { 206 errstr = "failed to encode param"; 207 goto fail; 208 } 209 210 key.kv_key = "Accept"; 211 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 212 kv->kv_value != NULL) 213 if (fcgi_add_param(buf, "HTTP_ACCEPT", kv->kv_value, 214 &total_len, clt) == -1) { 215 errstr = "failed to encode param"; 216 goto fail; 217 } 218 219 key.kv_key = "Accept-Encoding"; 220 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 221 kv->kv_value != NULL) 222 if (fcgi_add_param(buf, "HTTP_ACCEPT_ENCODING", kv->kv_value, 223 &total_len, clt) == -1) { 224 errstr = "failed to encode param"; 225 goto fail; 226 } 227 228 key.kv_key = "Accept-Language"; 229 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 230 kv->kv_value != NULL) 231 if (fcgi_add_param(buf, "HTTP_ACCEPT_LANGUAGE", kv->kv_value, 232 &total_len, clt) == -1) { 233 errstr = "failed to encode param"; 234 goto fail; 235 } 236 237 key.kv_key = "Connection"; 238 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 239 kv->kv_value != NULL) 240 if (fcgi_add_param(buf, "HTTP_CONNECTION", kv->kv_value, 241 &total_len, clt) == -1) { 242 errstr = "failed to encode param"; 243 goto fail; 244 } 245 246 key.kv_key = "Cookie"; 247 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 248 kv->kv_value != NULL) 249 if (fcgi_add_param(buf, "HTTP_COOKIE", kv->kv_value, 250 &total_len, clt) == -1) { 251 errstr = "failed to encode param"; 252 goto fail; 253 } 254 255 key.kv_key = "Host"; 256 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 257 kv->kv_value != NULL) 258 if (fcgi_add_param(buf, "HTTP_HOST", kv->kv_value, 259 &total_len, clt) == -1) { 260 errstr = "failed to encode param"; 261 goto fail; 262 } 263 264 key.kv_key = "User-Agent"; 265 if ((kv = kv_find(&desc->http_headers, &key)) != NULL && 266 kv->kv_value != NULL) 267 if (fcgi_add_param(buf, "HTTP_USER_AGENT", kv->kv_value, 268 &total_len, clt) == -1) { 269 errstr = "failed to encode param"; 270 goto fail; 271 } 272 273 (void)print_host(&clt->clt_ss, hbuf, sizeof(hbuf)); 274 if (fcgi_add_param(buf, "REMOTE_ADDR", hbuf, &total_len, clt) == -1) { 275 errstr = "failed to encode param"; 276 goto fail; 277 } 278 279 (void)snprintf(hbuf, sizeof(hbuf), "%d", ntohs(clt->clt_port)); 280 if (fcgi_add_param(buf, "REMOTE_PORT", hbuf, &total_len, clt) == -1) { 281 errstr = "failed to encode param"; 282 goto fail; 283 } 284 285 if (fcgi_add_param(buf, "REQUEST_METHOD", 286 server_httpmethod_byid(desc->http_method), &total_len, clt) == -1) { 287 errstr = "failed to encode param"; 288 goto fail; 289 } 290 291 if (!desc->http_query) { 292 if (fcgi_add_param(buf, "REQUEST_URI", desc->http_path, 293 &total_len, clt) == -1) { 294 errstr = "failed to encode param"; 295 goto fail; 296 } 297 } else if (asprintf(&request_uri, "%s?%s", desc->http_path, 298 desc->http_query) != -1) { 299 if (fcgi_add_param(buf, "REQUEST_URI", request_uri, &total_len, 300 clt) == -1) { 301 errstr = "failed to encode param"; 302 goto fail; 303 } 304 free(request_uri); 305 } 306 307 (void)print_host(&clt->clt_srv_ss, hbuf, sizeof(hbuf)); 308 if (fcgi_add_param(buf, "SERVER_ADDR", hbuf, &total_len, clt) == -1) { 309 errstr = "failed to encode param"; 310 goto fail; 311 } 312 313 (void)snprintf(hbuf, sizeof(hbuf), "%d", 314 ntohs(server_socket_getport(&clt->clt_srv_ss))); 315 if (fcgi_add_param(buf, "SERVER_PORT", hbuf, &total_len, clt) == -1) { 316 errstr = "failed to encode param"; 317 goto fail; 318 } 319 320 if (fcgi_add_param(buf, "SERVER_NAME", srv_conf->name, &total_len, 321 clt) == -1) { 322 errstr = "failed to encode param"; 323 goto fail; 324 } 325 326 if (fcgi_add_param(buf, "SERVER_PROTOCOL", desc->http_version, 327 &total_len, clt) == -1) { 328 errstr = "failed to encode param"; 329 goto fail; 330 } 331 332 if (fcgi_add_param(buf, "SERVER_SOFTWARE", HTTPD_SERVERNAME, &total_len, 333 clt) == -1) { 334 errstr = "failed to encode param"; 335 goto fail; 336 } 337 338 if (total_len != 0) { /* send last params record */ 339 bufferevent_write(clt->clt_srvbev, &buf, 340 sizeof(struct fcgi_record_header) + 341 ntohs(h->content_len)); 342 } 343 344 /* send "no more params" message */ 345 h->content_len = 0; 346 bufferevent_write(clt->clt_srvbev, &buf, 347 sizeof(struct fcgi_record_header)); 348 349 h->type = FCGI_STDIN; 350 351 bufferevent_write(clt->clt_srvbev, &buf, 352 sizeof(struct fcgi_record_header)); 353 354 bufferevent_settimeout(clt->clt_srvbev, 355 srv_conf->timeout.tv_sec, srv_conf->timeout.tv_sec); 356 bufferevent_enable(clt->clt_srvbev, EV_READ|EV_WRITE); 357 bufferevent_disable(clt->clt_bev, EV_READ); 358 359 /* 360 * persist is not supported yet because we don't get the 361 * Content-Length from slowcgi and don't support chunked encoding. 362 */ 363 clt->clt_persist = 0; 364 clt->clt_done = 0; 365 366 return (0); 367 fail: 368 if (errstr == NULL) 369 errstr = strerror(errno); 370 server_abort_http(clt, 500, errstr); 371 return (-1); 372} 373 374int 375fcgi_add_param(uint8_t *buf, const char *key, const char *val, int *total_len, 376 struct client *clt) 377{ 378 struct fcgi_record_header *h; 379 int len = 0; 380 int key_len = strlen(key); 381 int val_len = strlen(val); 382 uint8_t *param; 383 384 len += key_len + val_len; 385 len += key_len > 127 ? 4 : 1; 386 len += val_len > 127 ? 4 : 1; 387 388 DPRINTF("%s: %s[%d] => %s[%d], total_len: %d", __func__, key, key_len, 389 val, val_len, *total_len); 390 391 if (len > FCGI_CONTENT_SIZE) 392 return (-1); 393 394 if (*total_len + len > FCGI_CONTENT_SIZE) { 395 bufferevent_write(clt->clt_srvbev, buf, 396 sizeof(struct fcgi_record_header) + *total_len); 397 *total_len = 0; 398 } 399 400 h = (struct fcgi_record_header *) buf; 401 param = buf + sizeof(struct fcgi_record_header) + *total_len; 402 403 if (key_len > 127) { 404 *param++ = ((key_len >> 24) & 0xff) | 0x80; 405 *param++ = ((key_len >> 16) & 0xff); 406 *param++ = ((key_len >> 8) & 0xff); 407 *param++ = (key_len & 0xff); 408 } else 409 *param++ = key_len; 410 411 if (val_len > 127) { 412 *param++ = ((val_len >> 24) & 0xff) | 0x80; 413 *param++ = ((val_len >> 16) & 0xff); 414 *param++ = ((val_len >> 8) & 0xff); 415 *param++ = (val_len & 0xff); 416 } else 417 *param++ = val_len; 418 419 memcpy(param, key, key_len); 420 param += key_len; 421 memcpy(param, val, val_len); 422 423 *total_len += len; 424 425 h->content_len = htons(*total_len); 426 return (0); 427} 428 429void 430server_fcgi_read(struct bufferevent *bev, void *arg) 431{ 432 uint8_t buf[FCGI_RECORD_SIZE]; 433 struct client *clt = (struct client *) arg; 434 struct fcgi_record_header *h; 435 size_t len; 436 437 len = bufferevent_read(bev, &buf, clt->clt_fcgi_toread); 438 /* XXX error handling */ 439 evbuffer_add(clt->clt_srvevb, &buf, len); 440 clt->clt_fcgi_toread -= len; 441 DPRINTF("%s: len: %lu toread: %d state: %d", __func__, len, 442 clt->clt_fcgi_toread, clt->clt_fcgi_state); 443 444 if (clt->clt_fcgi_toread != 0) 445 return; 446 447 switch (clt->clt_fcgi_state) { 448 case FCGI_READ_HEADER: 449 clt->clt_fcgi_state = FCGI_READ_CONTENT; 450 h = (struct fcgi_record_header *) 451 EVBUFFER_DATA(clt->clt_srvevb); 452 DPRINTF("%s: record header: version %d type %d id %d " 453 "content len %d", __func__, h->version, h->type, 454 ntohs(h->id), ntohs(h->content_len)); 455 clt->clt_fcgi_type = h->type; 456 clt->clt_fcgi_toread = ntohs(h->content_len); 457 evbuffer_drain(clt->clt_srvevb, 458 EVBUFFER_LENGTH(clt->clt_srvevb)); 459 if (clt->clt_fcgi_toread != 0) 460 break; 461 462 /* fallthrough if content_len == 0 */ 463 case FCGI_READ_CONTENT: 464 if (clt->clt_fcgi_type == FCGI_STDOUT && 465 EVBUFFER_LENGTH(clt->clt_srvevb) > 0) { 466 if (++clt->clt_chunk == 1) 467 server_fcgi_header(clt, 200); 468 server_bufferevent_write_buffer(clt, 469 clt->clt_srvevb); 470 } 471 evbuffer_drain(clt->clt_srvevb, 472 EVBUFFER_LENGTH(clt->clt_srvevb)); 473 clt->clt_fcgi_state = FCGI_READ_HEADER; 474 clt->clt_fcgi_toread = 475 sizeof(struct fcgi_record_header); 476 } 477} 478 479int 480server_fcgi_header(struct client *clt, u_int code) 481{ 482 struct http_descriptor *desc = clt->clt_desc; 483 const char *error; 484 char tmbuf[32]; 485 486 if (desc == NULL || (error = server_httperror_byid(code)) == NULL) 487 return (-1); 488 489 kv_purge(&desc->http_headers); 490 491 /* Add error codes */ 492 if (kv_setkey(&desc->http_pathquery, "%lu", code) == -1 || 493 kv_set(&desc->http_pathquery, "%s", error) == -1) 494 return (-1); 495 496 /* Add headers */ 497 if (kv_add(&desc->http_headers, "Server", HTTPD_SERVERNAME) == NULL) 498 return (-1); 499 500 /* Is it a persistent connection? */ 501 if (clt->clt_persist) { 502 if (kv_add(&desc->http_headers, 503 "Connection", "keep-alive") == NULL) 504 return (-1); 505 } else if (kv_add(&desc->http_headers, "Connection", "close") == NULL) 506 return (-1); 507 508 /* Date header is mandatory and should be added last */ 509 server_http_date(tmbuf, sizeof(tmbuf)); 510 if (kv_add(&desc->http_headers, "Date", tmbuf) == NULL) 511 return (-1); 512 513 /* Write initial header (fcgi might append more) */ 514 if (server_writeresponse_http(clt) == -1 || 515 server_bufferevent_print(clt, "\r\n") == -1 || 516 server_writeheader_http(clt) == -1) 517 return (-1); 518 519 return (0); 520} 521