1 #include "first.h" 2 3 #include <string.h> 4 #include <stdlib.h> 5 6 #include "gw_backend.h" 7 #include "base.h" 8 #include "array.h" 9 #include "buffer.h" 10 #include "fdevent.h" 11 #include "http_kv.h" 12 #include "http_header.h" 13 #include "log.h" 14 #include "sock_addr.h" 15 #include "status_counter.h" 16 17 /** 18 * 19 * HTTP reverse proxy 20 * 21 * TODO: - HTTP/1.1 22 * - HTTP/1.1 persistent connection with upstream servers 23 */ 24 25 /* (future: might split struct and move part to http-header-glue.c) */ 26 typedef struct http_header_remap_opts { 27 const array *urlpaths; 28 const array *hosts_request; 29 const array *hosts_response; 30 int https_remap; 31 int upgrade; 32 int connect_method; 33 /*(not used in plugin_config, but used in handler_ctx)*/ 34 const buffer *http_host; 35 const buffer *forwarded_host; 36 const data_string *forwarded_urlpath; 37 } http_header_remap_opts; 38 39 typedef enum { 40 PROXY_FORWARDED_NONE = 0x00, 41 PROXY_FORWARDED_FOR = 0x01, 42 PROXY_FORWARDED_PROTO = 0x02, 43 PROXY_FORWARDED_HOST = 0x04, 44 PROXY_FORWARDED_BY = 0x08, 45 PROXY_FORWARDED_REMOTE_USER = 0x10 46 } proxy_forwarded_t; 47 48 typedef struct { 49 gw_plugin_config gw; /* start must match layout of gw_plugin_config */ 50 unsigned int replace_http_host; 51 unsigned int forwarded; 52 http_header_remap_opts header; 53 } plugin_config; 54 55 typedef struct { 56 PLUGIN_DATA; 57 pid_t srv_pid; /* must match layout of gw_plugin_data through conf member */ 58 plugin_config conf; 59 plugin_config defaults; 60 } plugin_data; 61 62 static int proxy_check_extforward; 63 static int proxy_force_http10; 64 65 typedef struct { 66 gw_handler_ctx gw; 67 http_response_opts opts; 68 plugin_config conf; 69 } handler_ctx; 70 71 72 INIT_FUNC(mod_proxy_init) { 73 return calloc(1, sizeof(plugin_data)); 74 } 75 76 77 static void mod_proxy_free_config(plugin_data * const p) 78 { 79 if (NULL == p->cvlist) return; 80 /* (init i to 0 if global context; to 1 to skip empty global context) */ 81 for (int i = !p->cvlist[0].v.u2[1], used = p->nconfig; i < used; ++i) { 82 config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0]; 83 for (; -1 != cpv->k_id; ++cpv) { 84 switch (cpv->k_id) { 85 case 5: /* proxy.header */ 86 if (cpv->vtype == T_CONFIG_LOCAL) free(cpv->v.v); 87 break; 88 default: 89 break; 90 } 91 } 92 } 93 } 94 95 96 FREE_FUNC(mod_proxy_free) { 97 plugin_data * const p = p_d; 98 mod_proxy_free_config(p); 99 gw_free(p); 100 } 101 102 static void mod_proxy_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) 103 { 104 switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */ 105 case 0: /* proxy.server */ 106 if (cpv->vtype == T_CONFIG_LOCAL) { 107 gw_plugin_config * const gw = cpv->v.v; 108 pconf->gw.exts = gw->exts; 109 pconf->gw.exts_auth = gw->exts_auth; 110 pconf->gw.exts_resp = gw->exts_resp; 111 } 112 break; 113 case 1: /* proxy.balance */ 114 /*if (cpv->vtype == T_CONFIG_LOCAL)*//*always true here for this param*/ 115 pconf->gw.balance = (int)cpv->v.u; 116 break; 117 case 2: /* proxy.debug */ 118 pconf->gw.debug = (int)cpv->v.u; 119 break; 120 case 3: /* proxy.map-extensions */ 121 pconf->gw.ext_mapping = cpv->v.a; 122 break; 123 case 4: /* proxy.forwarded */ 124 /*if (cpv->vtype == T_CONFIG_LOCAL)*//*always true here for this param*/ 125 pconf->forwarded = cpv->v.u; 126 break; 127 case 5: /* proxy.header */ 128 /*if (cpv->vtype == T_CONFIG_LOCAL)*//*always true here for this param*/ 129 pconf->header = *(http_header_remap_opts *)cpv->v.v; /*(copies struct)*/ 130 break; 131 case 6: /* proxy.replace-http-host */ 132 pconf->replace_http_host = cpv->v.u; 133 break; 134 default:/* should not happen */ 135 return; 136 } 137 } 138 139 140 static void mod_proxy_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) 141 { 142 do { 143 mod_proxy_merge_config_cpv(pconf, cpv); 144 } while ((++cpv)->k_id != -1); 145 } 146 147 148 static void mod_proxy_patch_config(request_st * const r, plugin_data * const p) 149 { 150 memcpy(&p->conf, &p->defaults, sizeof(plugin_config)); 151 for (int i = 1, used = p->nconfig; i < used; ++i) { 152 if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id)) 153 mod_proxy_merge_config(&p->conf, p->cvlist+p->cvlist[i].v.u2[0]); 154 } 155 } 156 157 158 static unsigned int mod_proxy_parse_forwarded(server *srv, const array *a) 159 { 160 unsigned int forwarded = 0; 161 for (uint32_t j = 0, used = a->used; j < used; ++j) { 162 proxy_forwarded_t param; 163 data_unset *du = a->data[j]; 164 if (buffer_eq_slen(&du->key, CONST_STR_LEN("by"))) 165 param = PROXY_FORWARDED_BY; 166 else if (buffer_eq_slen(&du->key, CONST_STR_LEN("for"))) 167 param = PROXY_FORWARDED_FOR; 168 else if (buffer_eq_slen(&du->key, CONST_STR_LEN("host"))) 169 param = PROXY_FORWARDED_HOST; 170 else if (buffer_eq_slen(&du->key, CONST_STR_LEN("proto"))) 171 param = PROXY_FORWARDED_PROTO; 172 else if (buffer_eq_slen(&du->key, CONST_STR_LEN("remote_user"))) 173 param = PROXY_FORWARDED_REMOTE_USER; 174 else { 175 log_error(srv->errh, __FILE__, __LINE__, 176 "proxy.forwarded keys must be one of: " 177 "by, for, host, proto, remote_user, but not: %s", du->key.ptr); 178 return UINT_MAX; 179 } 180 int val = config_plugin_value_tobool(du, 2); 181 if (2 == val) { 182 log_error(srv->errh, __FILE__, __LINE__, 183 "proxy.forwarded values must be one of: " 184 "0, 1, enable, disable; error for key: %s", du->key.ptr); 185 return UINT_MAX; 186 } 187 if (val) 188 forwarded |= param; 189 } 190 return forwarded; 191 } 192 193 194 static http_header_remap_opts * mod_proxy_parse_header_opts(server *srv, const array *a) 195 { 196 http_header_remap_opts header; 197 memset(&header, 0, sizeof(header)); 198 for (uint32_t j = 0, used = a->used; j < used; ++j) { 199 data_array *da = (data_array *)a->data[j]; 200 if (buffer_eq_slen(&da->key, CONST_STR_LEN("https-remap"))) { 201 int val = config_plugin_value_tobool((data_unset *)da, 2); 202 if (2 == val) { 203 log_error(srv->errh, __FILE__, __LINE__, 204 "unexpected value for proxy.header; " 205 "expected \"https-remap\" => \"enable\" or \"disable\""); 206 return NULL; 207 } 208 header.https_remap = val; 209 continue; 210 } 211 else if (buffer_eq_slen(&da->key, CONST_STR_LEN("upgrade"))) { 212 int val = config_plugin_value_tobool((data_unset *)da, 2); 213 if (2 == val) { 214 log_error(srv->errh, __FILE__, __LINE__, 215 "unexpected value for proxy.header; " 216 "expected \"upgrade\" => \"enable\" or \"disable\""); 217 return NULL; 218 } 219 header.upgrade = val; 220 continue; 221 } 222 else if (buffer_eq_slen(&da->key, CONST_STR_LEN("connect"))) { 223 int val = config_plugin_value_tobool((data_unset *)da, 2); 224 if (2 == val) { 225 log_error(srv->errh, __FILE__, __LINE__, 226 "unexpected value for proxy.header; " 227 "expected \"connect\" => \"enable\" or \"disable\""); 228 return NULL; 229 } 230 header.connect_method = val; 231 continue; 232 } 233 if (da->type != TYPE_ARRAY || !array_is_kvstring(&da->value)) { 234 log_error(srv->errh, __FILE__, __LINE__, 235 "unexpected value for proxy.header; " 236 "expected ( \"param\" => ( \"key\" => \"value\" ) ) near key %s", 237 da->key.ptr); 238 return NULL; 239 } 240 if (buffer_eq_slen(&da->key, CONST_STR_LEN("map-urlpath"))) { 241 header.urlpaths = &da->value; 242 } 243 else if (buffer_eq_slen(&da->key, CONST_STR_LEN("map-host-request"))) { 244 header.hosts_request = &da->value; 245 } 246 else if (buffer_eq_slen(&da->key, CONST_STR_LEN("map-host-response"))) { 247 header.hosts_response = &da->value; 248 } 249 else { 250 log_error(srv->errh, __FILE__, __LINE__, 251 "unexpected key for proxy.header; " 252 "expected ( \"param\" => ( \"key\" => \"value\" ) ) near key %s", 253 da->key.ptr); 254 return NULL; 255 } 256 } 257 258 http_header_remap_opts *opts = malloc(sizeof(header)); 259 force_assert(opts); 260 memcpy(opts, &header, sizeof(header)); 261 return opts; 262 } 263 264 265 SETDEFAULTS_FUNC(mod_proxy_set_defaults) 266 { 267 static const config_plugin_keys_t cpk[] = { 268 { CONST_STR_LEN("proxy.server"), 269 T_CONFIG_ARRAY_KVARRAY, 270 T_CONFIG_SCOPE_CONNECTION } 271 ,{ CONST_STR_LEN("proxy.balance"), 272 T_CONFIG_STRING, 273 T_CONFIG_SCOPE_CONNECTION } 274 ,{ CONST_STR_LEN("proxy.debug"), 275 T_CONFIG_INT, 276 T_CONFIG_SCOPE_CONNECTION } 277 ,{ CONST_STR_LEN("proxy.map-extensions"), 278 T_CONFIG_ARRAY_KVSTRING, 279 T_CONFIG_SCOPE_CONNECTION } 280 ,{ CONST_STR_LEN("proxy.forwarded"), 281 T_CONFIG_ARRAY_KVANY, 282 T_CONFIG_SCOPE_CONNECTION } 283 ,{ CONST_STR_LEN("proxy.header"), 284 T_CONFIG_ARRAY_KVANY, 285 T_CONFIG_SCOPE_CONNECTION } 286 ,{ CONST_STR_LEN("proxy.replace-http-host"), 287 T_CONFIG_BOOL, 288 T_CONFIG_SCOPE_CONNECTION } 289 ,{ NULL, 0, 290 T_CONFIG_UNSET, 291 T_CONFIG_SCOPE_UNSET } 292 }; 293 294 plugin_data * const p = p_d; 295 if (!config_plugin_values_init(srv, p, cpk, "mod_proxy")) 296 return HANDLER_ERROR; 297 298 /* process and validate config directives 299 * (init i to 0 if global context; to 1 to skip empty global context) */ 300 for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) { 301 config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0]; 302 gw_plugin_config *gw = NULL; 303 for (; -1 != cpv->k_id; ++cpv) { 304 switch (cpv->k_id) { 305 case 0: /* proxy.server */ 306 gw = calloc(1, sizeof(gw_plugin_config)); 307 force_assert(gw); 308 if (!gw_set_defaults_backend(srv, (gw_plugin_data *)p, cpv->v.a, 309 gw, 0, cpk[cpv->k_id].k)) { 310 gw_plugin_config_free(gw); 311 return HANDLER_ERROR; 312 } 313 /* error if "mode" = "authorizer"; 314 * proxy can not act as authorizer */ 315 /*(check after gw_set_defaults_backend())*/ 316 if (gw->exts_auth && gw->exts_auth->used) { 317 log_error(srv->errh, __FILE__, __LINE__, 318 "%s must not define any hosts with " 319 "attribute \"mode\" = \"authorizer\"", cpk[cpv->k_id].k); 320 gw_plugin_config_free(gw); 321 return HANDLER_ERROR; 322 } 323 cpv->v.v = gw; 324 cpv->vtype = T_CONFIG_LOCAL; 325 break; 326 case 1: /* proxy.balance */ 327 cpv->v.u = (unsigned int)gw_get_defaults_balance(srv, cpv->v.b); 328 break; 329 case 2: /* proxy.debug */ 330 case 3: /* proxy.map-extensions */ 331 break; 332 case 4: /* proxy.forwarded */ 333 cpv->v.u = mod_proxy_parse_forwarded(srv, cpv->v.a); 334 if (UINT_MAX == cpv->v.u) return HANDLER_ERROR; 335 cpv->vtype = T_CONFIG_LOCAL; 336 break; 337 case 5: /* proxy.header */ 338 cpv->v.v = mod_proxy_parse_header_opts(srv, cpv->v.a); 339 if (NULL == cpv->v.v) return HANDLER_ERROR; 340 cpv->vtype = T_CONFIG_LOCAL; 341 break; 342 case 6: /* proxy.replace-http-host */ 343 break; 344 default:/* should not happen */ 345 break; 346 } 347 } 348 349 /* disable check-local for all exts (default enabled) */ 350 if (gw && gw->exts) { /*(check after gw_set_defaults_backend())*/ 351 gw_exts_clear_check_local(gw->exts); 352 } 353 } 354 355 /* default is 0 */ 356 /*p->defaults.balance = (unsigned int)gw_get_defaults_balance(srv, NULL);*/ 357 358 /* initialize p->defaults from global config context */ 359 if (p->nconfig > 0 && p->cvlist->v.u2[1]) { 360 const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0]; 361 if (-1 != cpv->k_id) 362 mod_proxy_merge_config(&p->defaults, cpv); 363 } 364 365 /* special-case behavior if mod_extforward is loaded */ 366 for (uint32_t i = 0; i < srv->srvconf.modules->used; ++i) { 367 buffer *m = &((data_string *)srv->srvconf.modules->data[i])->value; 368 if (buffer_eq_slen(m, CONST_STR_LEN("mod_extforward"))) { 369 proxy_check_extforward = 1; 370 break; 371 } 372 } 373 374 proxy_force_http10 = 375 srv->srvconf.feature_flags 376 && config_plugin_value_tobool( 377 array_get_element_klen(srv->srvconf.feature_flags, 378 CONST_STR_LEN("proxy.force-http10")), 0); 379 380 return HANDLER_GO_ON; 381 } 382 383 384 /* (future: might move to http-header-glue.c) */ 385 static const buffer * http_header_remap_host_match (buffer *b, size_t off, http_header_remap_opts *remap_hdrs, int is_req, size_t alen) 386 { 387 const array *hosts = is_req 388 ? remap_hdrs->hosts_request 389 : remap_hdrs->hosts_response; 390 if (hosts) { 391 const char * const s = b->ptr+off; 392 for (size_t i = 0, used = hosts->used; i < used; ++i) { 393 const data_string * const ds = (data_string *)hosts->data[i]; 394 const buffer *k = &ds->key; 395 size_t mlen = buffer_string_length(k); 396 if (1 == mlen && k->ptr[0] == '-') { 397 /* match with authority provided in Host (if is_req) 398 * (If no Host in client request, then matching against empty 399 * string will probably not match, and no remap will be 400 * performed) */ 401 k = is_req 402 ? remap_hdrs->http_host 403 : remap_hdrs->forwarded_host; 404 if (NULL == k) continue; 405 mlen = buffer_string_length(k); 406 } 407 if (buffer_eq_icase_ss(s, alen, k->ptr, mlen)) { 408 if (buffer_is_equal_string(&ds->value, CONST_STR_LEN("-"))) { 409 return remap_hdrs->http_host; 410 } 411 else if (!buffer_string_is_empty(&ds->value)) { 412 /*(save first matched request host for response match)*/ 413 if (is_req && NULL == remap_hdrs->forwarded_host) 414 remap_hdrs->forwarded_host = &ds->value; 415 return &ds->value; 416 } /*(else leave authority as-is and stop matching)*/ 417 break; 418 } 419 } 420 } 421 return NULL; 422 } 423 424 425 /* (future: might move to http-header-glue.c) */ 426 static size_t http_header_remap_host (buffer *b, size_t off, http_header_remap_opts *remap_hdrs, int is_req, size_t alen) 427 { 428 const buffer * const m = 429 http_header_remap_host_match(b, off, remap_hdrs, is_req, alen); 430 if (NULL == m) return alen; /*(no match; return original authority length)*/ 431 432 buffer_substr_replace(b, off, alen, m); 433 return buffer_string_length(m); /*(length of replacement authority)*/ 434 } 435 436 437 /* (future: might move to http-header-glue.c) */ 438 static size_t http_header_remap_urlpath (buffer *b, size_t off, http_header_remap_opts *remap_hdrs, int is_req) 439 { 440 const array *urlpaths = remap_hdrs->urlpaths; 441 if (urlpaths) { 442 const char * const s = b->ptr+off; 443 const size_t plen = buffer_string_length(b) - off; /*(urlpath len)*/ 444 if (is_req) { /* request */ 445 for (size_t i = 0, used = urlpaths->used; i < used; ++i) { 446 const data_string * const ds = (data_string *)urlpaths->data[i]; 447 const size_t mlen = buffer_string_length(&ds->key); 448 if (mlen <= plen && 0 == memcmp(s, ds->key.ptr, mlen)) { 449 if (NULL == remap_hdrs->forwarded_urlpath) 450 remap_hdrs->forwarded_urlpath = ds; 451 buffer_substr_replace(b, off, mlen, &ds->value); 452 return buffer_string_length(&ds->value);/*(replacement len)*/ 453 } 454 } 455 } 456 else { /* response; perform reverse map */ 457 if (NULL != remap_hdrs->forwarded_urlpath) { 458 const data_string * const ds = remap_hdrs->forwarded_urlpath; 459 const size_t mlen = buffer_string_length(&ds->value); 460 if (mlen <= plen && 0 == memcmp(s, ds->value.ptr, mlen)) { 461 buffer_substr_replace(b, off, mlen, &ds->key); 462 return buffer_string_length(&ds->key); /*(replacement len)*/ 463 } 464 } 465 for (size_t i = 0, used = urlpaths->used; i < used; ++i) { 466 const data_string * const ds = (data_string *)urlpaths->data[i]; 467 const size_t mlen = buffer_string_length(&ds->value); 468 if (mlen <= plen && 0 == memcmp(s, ds->value.ptr, mlen)) { 469 buffer_substr_replace(b, off, mlen, &ds->key); 470 return buffer_string_length(&ds->key); /*(replacement len)*/ 471 } 472 } 473 } 474 } 475 return 0; 476 } 477 478 479 /* (future: might move to http-header-glue.c) */ 480 static void http_header_remap_uri (buffer *b, size_t off, http_header_remap_opts *remap_hdrs, int is_req) 481 { 482 /* find beginning of URL-path (might be preceded by scheme://authority 483 * (caller should make sure any leading whitespace is prior to offset) */ 484 if (b->ptr[off] != '/') { 485 char *s = b->ptr+off; 486 size_t alen; /*(authority len (host len))*/ 487 size_t slen; /*(scheme len)*/ 488 const buffer *m; 489 /* skip over scheme and authority of URI to find beginning of URL-path 490 * (value might conceivably be relative URL-path instead of URI) */ 491 if (NULL == (s = strchr(s, ':')) || s[1] != '/' || s[2] != '/') return; 492 slen = s - (b->ptr+off); 493 s += 3; 494 off = (size_t)(s - b->ptr); 495 if (NULL != (s = strchr(s, '/'))) { 496 alen = (size_t)(s - b->ptr) - off; 497 if (0 == alen) return; /*(empty authority, e.g. "http:///")*/ 498 } 499 else { 500 alen = buffer_string_length(b) - off; 501 if (0 == alen) return; /*(empty authority, e.g. "http:///")*/ 502 buffer_append_string_len(b, CONST_STR_LEN("/")); 503 } 504 505 /* remap authority (if configured) and set offset to url-path */ 506 m = http_header_remap_host_match(b, off, remap_hdrs, is_req, alen); 507 if (NULL != m) { 508 if (remap_hdrs->https_remap 509 && (is_req ? 5==slen && 0==memcmp(b->ptr+off-slen-3,"https",5) 510 : 4==slen && 0==memcmp(b->ptr+off-slen-3,"http",4))){ 511 if (is_req) { 512 memcpy(b->ptr+off-slen-3+4,"://",3); /*("https"=>"http")*/ 513 --off; 514 ++alen; 515 } 516 else {/*(!is_req)*/ 517 memcpy(b->ptr+off-slen-3+4,"s://",4); /*("http" =>"https")*/ 518 ++off; 519 --alen; 520 } 521 } 522 buffer_substr_replace(b, off, alen, m); 523 alen = buffer_string_length(m);/*(length of replacement authority)*/ 524 } 525 off += alen; 526 } 527 528 /* remap URLs (if configured) */ 529 http_header_remap_urlpath(b, off, remap_hdrs, is_req); 530 } 531 532 533 /* (future: might move to http-header-glue.c) */ 534 static void http_header_remap_setcookie (buffer *b, size_t off, http_header_remap_opts *remap_hdrs) 535 { 536 /* Given the special-case of Set-Cookie and the (too) loosely restricted 537 * characters allowed, for best results, the Set-Cookie value should be the 538 * entire string in b from offset to end of string. In response headers, 539 * lighttpd may concatenate multiple Set-Cookie headers into single entry 540 * in r->resp_headers, separated by "\r\nSet-Cookie: " */ 541 for (char *s = b->ptr+off, *e; *s; s = e) { 542 size_t len; 543 { 544 while (*s != ';' && *s != '\n' && *s != '\0') ++s; 545 if (*s == '\n') { 546 /*(include +1 for '\n', but leave ' ' for ++s below)*/ 547 s += sizeof("Set-Cookie:"); 548 } 549 if ('\0' == *s) return; 550 do { ++s; } while (*s == ' ' || *s == '\t'); 551 if ('\0' == *s) return; 552 e = s+1; 553 if ('=' == *s) continue; 554 /*(interested only in Domain and Path attributes)*/ 555 while (*e != '=' && *e != '\0') ++e; 556 if ('\0' == *e) return; 557 ++e; 558 switch ((int)(e - s - 1)) { 559 case 4: 560 if (buffer_eq_icase_ssn(s, "path", 4)) { 561 if (*e == '"') ++e; 562 if (*e != '/') continue; 563 off = (size_t)(e - b->ptr); 564 len = http_header_remap_urlpath(b, off, remap_hdrs, 0); 565 e = b->ptr+off+len; /*(b may have been reallocated)*/ 566 continue; 567 } 568 break; 569 case 6: 570 if (buffer_eq_icase_ssn(s, "domain", 6)) { 571 size_t alen = 0; 572 if (*e == '"') ++e; 573 if (*e == '.') ++e; 574 if (*e == ';') continue; 575 off = (size_t)(e - b->ptr); 576 for (char c; (c = e[alen]) != ';' && c != ' ' && c != '\t' 577 && c != '\r' && c != '\0'; ++alen); 578 len = http_header_remap_host(b, off, remap_hdrs, 0, alen); 579 e = b->ptr+off+len; /*(b may have been reallocated)*/ 580 continue; 581 } 582 break; 583 default: 584 break; 585 } 586 } 587 } 588 } 589 590 591 static void buffer_append_string_backslash_escaped(buffer *b, const char *s, size_t len) { 592 /* (future: might move to buffer.c) */ 593 size_t j = 0; 594 char *p; 595 596 buffer_string_prepare_append(b, len*2 + 4); 597 p = b->ptr + buffer_string_length(b); 598 599 for (size_t i = 0; i < len; ++i) { 600 int c = s[i]; 601 if (c == '"' || c == '\\' || c == 0x7F || (c < 0x20 && c != '\t')) 602 p[j++] = '\\'; 603 p[j++] = c; 604 } 605 606 buffer_commit(b, j); 607 } 608 609 static void proxy_set_Forwarded(connection * const con, request_st * const r, const unsigned int flags) { 610 buffer *b = NULL, *efor = NULL, *eproto = NULL, *ehost = NULL; 611 int semicolon = 0; 612 613 if (proxy_check_extforward) { 614 efor = 615 http_header_env_get(r, CONST_STR_LEN("_L_EXTFORWARD_ACTUAL_FOR")); 616 eproto = 617 http_header_env_get(r, CONST_STR_LEN("_L_EXTFORWARD_ACTUAL_PROTO")); 618 ehost = 619 http_header_env_get(r, CONST_STR_LEN("_L_EXTFORWARD_ACTUAL_HOST")); 620 } 621 622 /* note: set "Forwarded" prior to updating X-Forwarded-For (below) */ 623 624 if (flags) 625 b = http_header_request_get(r, HTTP_HEADER_FORWARDED, CONST_STR_LEN("Forwarded")); 626 627 if (flags && NULL == b) { 628 const buffer *xff = 629 http_header_request_get(r, HTTP_HEADER_X_FORWARDED_FOR, CONST_STR_LEN("X-Forwarded-For")); 630 http_header_request_set(r, HTTP_HEADER_FORWARDED, 631 CONST_STR_LEN("Forwarded"), 632 CONST_STR_LEN("x")); /*(must not be blank for _get below)*/ 633 #ifdef __COVERITY__ 634 force_assert(NULL != b); /*(not NULL because created directly above)*/ 635 #endif 636 b = http_header_request_get(r, HTTP_HEADER_FORWARDED, CONST_STR_LEN("Forwarded")); 637 buffer_clear(b); 638 if (NULL != xff) { 639 /* use X-Forwarded-For contents to seed Forwarded */ 640 char *s = xff->ptr; 641 size_t used = buffer_string_length(xff); 642 for (size_t i=0, j, ipv6; i < used; ++i) { 643 while (s[i] == ' ' || s[i] == '\t' || s[i] == ',') ++i; 644 if (s[i] == '\0') break; 645 j = i; 646 do { 647 ++i; 648 } while (s[i]!=' ' && s[i]!='\t' && s[i]!=',' && s[i]!='\0'); 649 buffer_append_string_len(b, CONST_STR_LEN("for=")); 650 /* over-simplified test expecting only IPv4 or IPv6 addresses, 651 * (not expecting :port, so treat existence of colon as IPv6, 652 * and not expecting unix paths, especially not containing ':') 653 * quote all strings, backslash-escape since IPs not validated*/ 654 ipv6 = (NULL != memchr(s+j, ':', i-j)); /*(over-simplified) */ 655 buffer_append_string_len(b, CONST_STR_LEN("\"")); 656 if (ipv6) 657 buffer_append_string_len(b, CONST_STR_LEN("[")); 658 buffer_append_string_backslash_escaped(b, s+j, i-j); 659 if (ipv6) 660 buffer_append_string_len(b, CONST_STR_LEN("]")); 661 buffer_append_string_len(b, CONST_STR_LEN("\"")); 662 buffer_append_string_len(b, CONST_STR_LEN(", ")); 663 } 664 } 665 } else if (flags) { /*(NULL != b)*/ 666 buffer_append_string_len(b, CONST_STR_LEN(", ")); 667 } 668 669 if (flags & PROXY_FORWARDED_FOR) { 670 int family = sock_addr_get_family(&con->dst_addr); 671 buffer_append_string_len(b, CONST_STR_LEN("for=")); 672 if (NULL != efor) { 673 /* over-simplified test expecting only IPv4 or IPv6 addresses, 674 * (not expecting :port, so treat existence of colon as IPv6, 675 * and not expecting unix paths, especially not containing ':') 676 * quote all strings and backslash-escape since IPs not validated 677 * (should be IP from original con->dst_addr_buf, 678 * so trustable and without :port) */ 679 int ipv6 = (NULL != strchr(efor->ptr, ':')); 680 buffer_append_string_len(b, CONST_STR_LEN("\"")); 681 if (ipv6) buffer_append_string_len(b, CONST_STR_LEN("[")); 682 buffer_append_string_backslash_escaped( 683 b, CONST_BUF_LEN(efor)); 684 if (ipv6) buffer_append_string_len(b, CONST_STR_LEN("]")); 685 buffer_append_string_len(b, CONST_STR_LEN("\"")); 686 } else if (family == AF_INET) { 687 /*(Note: if :port is added, then must be quoted-string: 688 * e.g. for="...:port")*/ 689 buffer_append_string_buffer(b, con->dst_addr_buf); 690 } else if (family == AF_INET6) { 691 buffer_append_string_len(b, CONST_STR_LEN("\"[")); 692 buffer_append_string_buffer(b, con->dst_addr_buf); 693 buffer_append_string_len(b, CONST_STR_LEN("]\"")); 694 } else { 695 buffer_append_string_len(b, CONST_STR_LEN("\"")); 696 buffer_append_string_backslash_escaped( 697 b, CONST_BUF_LEN(con->dst_addr_buf)); 698 buffer_append_string_len(b, CONST_STR_LEN("\"")); 699 } 700 semicolon = 1; 701 } 702 703 if (flags & PROXY_FORWARDED_BY) { 704 int family = sock_addr_get_family(&con->srv_socket->addr); 705 /* Note: getsockname() and inet_ntop() are expensive operations. 706 * (recommendation: do not to enable by=... unless required) 707 * future: might use con->srv_socket->srv_token if addr is not 708 * INADDR_ANY or in6addr_any, but must omit optional :port 709 * from con->srv_socket->srv_token for consistency */ 710 711 if (semicolon) buffer_append_string_len(b, CONST_STR_LEN(";")); 712 buffer_append_string_len(b, CONST_STR_LEN("by=")); 713 buffer_append_string_len(b, CONST_STR_LEN("\"")); 714 #ifdef HAVE_SYS_UN_H 715 /* special-case: might need to encode unix domain socket path */ 716 if (family == AF_UNIX) { 717 buffer_append_string_backslash_escaped( 718 b, CONST_BUF_LEN(con->srv_socket->srv_token)); 719 } 720 else 721 #endif 722 { 723 sock_addr addr; 724 socklen_t addrlen = sizeof(addr); 725 if (0 == getsockname(con->fd,(struct sockaddr *)&addr, &addrlen)) { 726 sock_addr_stringify_append_buffer(b, &addr); 727 } 728 } 729 buffer_append_string_len(b, CONST_STR_LEN("\"")); 730 semicolon = 1; 731 } 732 733 if (flags & PROXY_FORWARDED_PROTO) { 734 /* expecting "http" or "https" 735 * (not checking if quoted-string and encoding needed) */ 736 if (semicolon) buffer_append_string_len(b, CONST_STR_LEN(";")); 737 buffer_append_string_len(b, CONST_STR_LEN("proto=")); 738 if (NULL != eproto) { 739 buffer_append_string_buffer(b, eproto); 740 } else if (con->srv_socket->is_ssl) { 741 buffer_append_string_len(b, CONST_STR_LEN("https")); 742 } else { 743 buffer_append_string_len(b, CONST_STR_LEN("http")); 744 } 745 semicolon = 1; 746 } 747 748 if (flags & PROXY_FORWARDED_HOST) { 749 if (NULL != ehost) { 750 if (semicolon) 751 buffer_append_string_len(b, CONST_STR_LEN(";")); 752 buffer_append_string_len(b, CONST_STR_LEN("host=\"")); 753 buffer_append_string_backslash_escaped( 754 b, CONST_BUF_LEN(ehost)); 755 buffer_append_string_len(b, CONST_STR_LEN("\"")); 756 semicolon = 1; 757 } else if (!buffer_string_is_empty(r->http_host)) { 758 if (semicolon) 759 buffer_append_string_len(b, CONST_STR_LEN(";")); 760 buffer_append_string_len(b, CONST_STR_LEN("host=\"")); 761 buffer_append_string_backslash_escaped( 762 b, CONST_BUF_LEN(r->http_host)); 763 buffer_append_string_len(b, CONST_STR_LEN("\"")); 764 semicolon = 1; 765 } 766 } 767 768 if (flags & PROXY_FORWARDED_REMOTE_USER) { 769 const buffer *remote_user = 770 http_header_env_get(r, CONST_STR_LEN("REMOTE_USER")); 771 if (NULL != remote_user) { 772 if (semicolon) 773 buffer_append_string_len(b, CONST_STR_LEN(";")); 774 buffer_append_string_len(b, CONST_STR_LEN("remote_user=\"")); 775 buffer_append_string_backslash_escaped( 776 b, CONST_BUF_LEN(remote_user)); 777 buffer_append_string_len(b, CONST_STR_LEN("\"")); 778 /*semicolon = 1;*/ 779 } 780 } 781 782 /* legacy X-* headers, including X-Forwarded-For */ 783 784 b = (NULL != efor) ? efor : con->dst_addr_buf; 785 http_header_request_set(r, HTTP_HEADER_X_FORWARDED_FOR, 786 CONST_STR_LEN("X-Forwarded-For"), 787 CONST_BUF_LEN(b)); 788 789 b = (NULL != ehost) ? ehost : r->http_host; 790 if (!buffer_string_is_empty(b)) { 791 http_header_request_set(r, HTTP_HEADER_OTHER, 792 CONST_STR_LEN("X-Host"), 793 CONST_BUF_LEN(b)); 794 http_header_request_set(r, HTTP_HEADER_OTHER, 795 CONST_STR_LEN("X-Forwarded-Host"), 796 CONST_BUF_LEN(b)); 797 } 798 799 b = (NULL != eproto) ? eproto : &r->uri.scheme; 800 http_header_request_set(r, HTTP_HEADER_X_FORWARDED_PROTO, 801 CONST_STR_LEN("X-Forwarded-Proto"), 802 CONST_BUF_LEN(b)); 803 } 804 805 806 static handler_t proxy_stdin_append(gw_handler_ctx *hctx) { 807 /*handler_ctx *hctx = (handler_ctx *)gwhctx;*/ 808 chunkqueue * const req_cq = &hctx->r->reqbody_queue; 809 const off_t req_cqlen = chunkqueue_length(req_cq); 810 if (req_cqlen) { 811 /* XXX: future: use http_chunk_len_append() */ 812 buffer * const tb = hctx->r->tmp_buf; 813 buffer_clear(tb); 814 buffer_append_uint_hex_lc(tb, (uintmax_t)req_cqlen); 815 buffer_append_string_len(tb, CONST_STR_LEN("\r\n")); 816 817 const off_t len = (off_t)buffer_string_length(tb) 818 + 2 /*(+2 end chunk "\r\n")*/ 819 + req_cqlen; 820 if (-1 != hctx->wb_reqlen) 821 hctx->wb_reqlen += (hctx->wb_reqlen >= 0) ? len : -len; 822 823 (chunkqueue_is_empty(&hctx->wb) || hctx->wb.first->type == MEM_CHUNK) 824 /* else FILE_CHUNK for temp file */ 825 ? chunkqueue_append_mem(&hctx->wb, CONST_BUF_LEN(tb)) 826 : chunkqueue_append_mem_min(&hctx->wb, CONST_BUF_LEN(tb)); 827 chunkqueue_steal(&hctx->wb, req_cq, req_cqlen); 828 829 chunkqueue_append_mem_min(&hctx->wb, CONST_STR_LEN("\r\n")); 830 } 831 832 if (hctx->wb.bytes_in == hctx->wb_reqlen) {/*hctx->r->reqbody_length >= 0*/ 833 /* terminate STDIN */ 834 chunkqueue_append_mem(&hctx->wb, CONST_STR_LEN("0\r\n\r\n")); 835 hctx->wb_reqlen += (int)sizeof("0\r\n\r\n"); 836 } 837 838 return HANDLER_GO_ON; 839 } 840 841 842 static handler_t proxy_create_env(gw_handler_ctx *gwhctx) { 843 handler_ctx *hctx = (handler_ctx *)gwhctx; 844 request_st * const r = hctx->gw.r; 845 const int remap_headers = (NULL != hctx->conf.header.urlpaths 846 || NULL != hctx->conf.header.hosts_request); 847 size_t rsz = (size_t)(r->read_queue.bytes_out - hctx->gw.wb.bytes_in); 848 if (rsz >= 65536) rsz = r->rqst_header_len; 849 buffer * const b = chunkqueue_prepend_buffer_open_sz(&hctx->gw.wb, rsz); 850 851 /* build header */ 852 853 /* request line */ 854 http_method_append(b, r->http_method); 855 buffer_append_string_len(b, CONST_STR_LEN(" ")); 856 buffer_append_string_buffer(b, &r->target); 857 if (remap_headers) 858 http_header_remap_uri(b, buffer_string_length(b) - buffer_string_length(&r->target), &hctx->conf.header, 1); 859 860 if (!proxy_force_http10) 861 buffer_append_string_len(b, CONST_STR_LEN(" HTTP/1.1\r\n")); 862 else 863 buffer_append_string_len(b, CONST_STR_LEN(" HTTP/1.0\r\n")); 864 865 if (hctx->conf.replace_http_host && !buffer_string_is_empty(hctx->gw.host->id)) { 866 if (hctx->gw.conf.debug > 1) { 867 log_error(r->conf.errh, __FILE__, __LINE__, 868 "proxy - using \"%s\" as HTTP Host", hctx->gw.host->id->ptr); 869 } 870 buffer_append_string_len(b, CONST_STR_LEN("Host: ")); 871 buffer_append_string_buffer(b, hctx->gw.host->id); 872 buffer_append_string_len(b, CONST_STR_LEN("\r\n")); 873 } else if (!buffer_string_is_empty(r->http_host)) { 874 buffer_append_string_len(b, CONST_STR_LEN("Host: ")); 875 buffer_append_string_buffer(b, r->http_host); 876 if (remap_headers) { 877 size_t alen = buffer_string_length(r->http_host); 878 http_header_remap_host(b, buffer_string_length(b) - alen, &hctx->conf.header, 1, alen); 879 } 880 buffer_append_string_len(b, CONST_STR_LEN("\r\n")); 881 } 882 883 /* "Forwarded" and legacy X- headers */ 884 proxy_set_Forwarded(r->con, r, hctx->conf.forwarded); 885 886 if (r->reqbody_length > 0 887 || (0 == r->reqbody_length 888 && !http_method_get_or_head(r->http_method))) { 889 /* set Content-Length if client sent Transfer-Encoding: chunked 890 * and not streaming to backend (request body has been fully received) */ 891 const buffer *vb = http_header_request_get(r, HTTP_HEADER_CONTENT_LENGTH, CONST_STR_LEN("Content-Length")); 892 if (NULL == vb) { 893 char buf[LI_ITOSTRING_LENGTH]; 894 http_header_request_set(r, HTTP_HEADER_CONTENT_LENGTH, CONST_STR_LEN("Content-Length"), 895 buf, li_itostrn(buf, sizeof(buf), r->reqbody_length)); 896 } 897 } 898 else if (!proxy_force_http10 899 && -1 == r->reqbody_length 900 && (r->conf.stream_request_body 901 & (FDEVENT_STREAM_REQUEST | FDEVENT_STREAM_REQUEST_BUFMIN))) { 902 hctx->gw.stdin_append = proxy_stdin_append; /* stream chunked body */ 903 buffer_append_string_len(b, CONST_STR_LEN("Transfer-Encoding: chunked\r\n")); 904 } 905 906 /* request header */ 907 const buffer *connhdr = NULL; 908 buffer *te = NULL; 909 buffer *upgrade = NULL; 910 for (size_t i = 0, used = r->rqst_headers.used; i < used; ++i) { 911 data_string *ds = (data_string *)r->rqst_headers.data[i]; 912 const size_t klen = buffer_string_length(&ds->key); 913 size_t vlen; 914 switch (klen) { 915 default: 916 break; 917 case 2: 918 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("TE"))) { 919 if (proxy_force_http10 || r->http_version == HTTP_VERSION_1_0) continue; 920 /* ignore if not exactly "trailers" */ 921 if (!buffer_eq_icase_slen(&ds->value, CONST_STR_LEN("trailers"))) continue; 922 te = &ds->value; 923 } 924 break; 925 case 4: 926 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("Host"))) continue; /*(handled further above)*/ 927 break; 928 case 7: 929 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("Upgrade"))) { 930 if (proxy_force_http10 || r->http_version == HTTP_VERSION_1_0) continue; 931 if (!hctx->conf.header.upgrade) continue; 932 upgrade = &ds->value; 933 } 934 break; 935 case 10: 936 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("Connection"))) { connhdr = &ds->value; continue; } 937 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("Set-Cookie"))) continue; /*(response header only; avoid accidental reflection)*/ 938 break; 939 case 16: 940 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("Proxy-Connection"))) continue; 941 break; 942 case 5: 943 /* Do not emit HTTP_PROXY in environment. 944 * Some executables use HTTP_PROXY to configure 945 * outgoing proxy. See also https://httpoxy.org/ */ 946 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("Proxy"))) continue; 947 break; 948 case 6: 949 /* Do not forward Expect: 100-continue 950 * since we do not handle "HTTP/1.1 100 Continue" response */ 951 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("Expect"))) continue; 952 break; 953 case 0: 954 continue; 955 } 956 957 vlen = buffer_string_length(&ds->value); 958 if (0 == vlen) continue; 959 960 if (buffer_string_space(b) < klen + vlen + 4) { 961 size_t extend = b->size * 2 - buffer_string_length(b); 962 extend = extend > klen + vlen + 4 ? extend : klen + vlen + 4 + 4095; 963 buffer_string_prepare_append(b, extend); 964 } 965 966 buffer_append_string_len(b, ds->key.ptr, klen); 967 buffer_append_string_len(b, CONST_STR_LEN(": ")); 968 buffer_append_string_len(b, ds->value.ptr, vlen); 969 buffer_append_string_len(b, CONST_STR_LEN("\r\n")); 970 971 if (!remap_headers) continue; 972 973 /* check for hdrs for which to remap URIs in-place after append to b */ 974 975 switch (klen) { 976 default: 977 continue; 978 #if 0 /* "URI" is HTTP response header (non-standard; historical in Apache) */ 979 case 3: 980 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("URI"))) break; 981 continue; 982 #endif 983 #if 0 /* "Location" is HTTP response header */ 984 case 8: 985 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("Location"))) break; 986 continue; 987 #endif 988 case 11: /* "Destination" is WebDAV request header */ 989 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("Destination"))) break; 990 continue; 991 case 16: /* "Content-Location" may be HTTP request or response header */ 992 if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("Content-Location"))) break; 993 continue; 994 } 995 996 http_header_remap_uri(b, buffer_string_length(b) - vlen - 2, &hctx->conf.header, 1); 997 } 998 999 if (connhdr && !proxy_force_http10 && r->http_version >= HTTP_VERSION_1_1 1000 && !buffer_eq_icase_slen(connhdr, CONST_STR_LEN("close"))) { 1001 /* mod_proxy always sends Connection: close to backend */ 1002 buffer_append_string_len(b, CONST_STR_LEN("Connection: close")); 1003 /* (future: might be pedantic and also check Connection header for each 1004 * token using http_header_str_contains_token() */ 1005 if (!buffer_string_is_empty(te)) 1006 buffer_append_string_len(b, CONST_STR_LEN(", te")); 1007 if (!buffer_string_is_empty(upgrade)) 1008 buffer_append_string_len(b, CONST_STR_LEN(", upgrade")); 1009 buffer_append_string_len(b, CONST_STR_LEN("\r\n\r\n")); 1010 } 1011 else /* mod_proxy always sends Connection: close to backend */ 1012 buffer_append_string_len(b, CONST_STR_LEN("Connection: close\r\n\r\n")); 1013 1014 hctx->gw.wb_reqlen = buffer_string_length(b); 1015 chunkqueue_prepend_buffer_commit(&hctx->gw.wb); 1016 1017 if (r->reqbody_length) { 1018 chunkqueue_append_chunkqueue(&hctx->gw.wb, &r->reqbody_queue); 1019 if (r->reqbody_length > 0) 1020 hctx->gw.wb_reqlen += r->reqbody_length; /* total req size */ 1021 else /* as-yet-unknown total request size (Transfer-Encoding: chunked)*/ 1022 hctx->gw.wb_reqlen = -hctx->gw.wb_reqlen; 1023 } 1024 1025 status_counter_inc(CONST_STR_LEN("proxy.requests")); 1026 return HANDLER_GO_ON; 1027 } 1028 1029 1030 static handler_t proxy_create_env_connect(gw_handler_ctx *gwhctx) { 1031 handler_ctx *hctx = (handler_ctx *)gwhctx; 1032 request_st * const r = hctx->gw.r; 1033 r->http_status = 200; /* OK */ 1034 r->resp_body_started = 1; 1035 gw_set_transparent(&hctx->gw); 1036 http_response_upgrade_read_body_unknown(r); 1037 1038 status_counter_inc(CONST_STR_LEN("proxy.requests")); 1039 return HANDLER_GO_ON; 1040 } 1041 1042 1043 static handler_t proxy_response_headers(request_st * const r, struct http_response_opts_t *opts) { 1044 /* response headers just completed */ 1045 handler_ctx *hctx = (handler_ctx *)opts->pdata; 1046 1047 if (light_btst(r->resp_htags, HTTP_HEADER_UPGRADE)) { 1048 if (hctx->conf.header.upgrade && r->http_status == 101) { 1049 /* 101 Switching Protocols; transition to transparent proxy */ 1050 gw_set_transparent(&hctx->gw); 1051 http_response_upgrade_read_body_unknown(r); 1052 } 1053 else { 1054 light_bclr(r->resp_htags, HTTP_HEADER_UPGRADE); 1055 #if 0 1056 /* preserve prior questionable behavior; likely broken behavior 1057 * anyway if backend thinks connection is being upgraded but client 1058 * does not receive Connection: upgrade */ 1059 http_header_response_unset(r, HTTP_HEADER_UPGRADE, 1060 CONST_STR_LEN("Upgrade")) 1061 #endif 1062 } 1063 } 1064 1065 /* rewrite paths, if needed */ 1066 1067 if (NULL == hctx->conf.header.urlpaths 1068 && NULL == hctx->conf.header.hosts_response) 1069 return HANDLER_GO_ON; 1070 1071 if (light_btst(r->resp_htags, HTTP_HEADER_LOCATION)) { 1072 buffer *vb = http_header_response_get(r, HTTP_HEADER_LOCATION, CONST_STR_LEN("Location")); 1073 if (vb) http_header_remap_uri(vb, 0, &hctx->conf.header, 0); 1074 } 1075 if (light_btst(r->resp_htags, HTTP_HEADER_CONTENT_LOCATION)) { 1076 buffer *vb = http_header_response_get(r, HTTP_HEADER_CONTENT_LOCATION, CONST_STR_LEN("Content-Location")); 1077 if (vb) http_header_remap_uri(vb, 0, &hctx->conf.header, 0); 1078 } 1079 if (light_btst(r->resp_htags, HTTP_HEADER_SET_COOKIE)) { 1080 buffer *vb = http_header_response_get(r, HTTP_HEADER_SET_COOKIE, CONST_STR_LEN("Set-Cookie")); 1081 if (vb) http_header_remap_setcookie(vb, 0, &hctx->conf.header); 1082 } 1083 1084 return HANDLER_GO_ON; 1085 } 1086 1087 static handler_t mod_proxy_check_extension(request_st * const r, void *p_d) { 1088 plugin_data *p = p_d; 1089 handler_t rc; 1090 1091 if (NULL != r->handler_module) return HANDLER_GO_ON; 1092 1093 mod_proxy_patch_config(r, p); 1094 if (NULL == p->conf.gw.exts) return HANDLER_GO_ON; 1095 1096 rc = gw_check_extension(r, (gw_plugin_data *)p, 1, sizeof(handler_ctx)); 1097 if (HANDLER_GO_ON != rc) return rc; 1098 1099 if (r->handler_module == p->self) { 1100 handler_ctx *hctx = r->plugin_ctx[p->id]; 1101 hctx->gw.create_env = proxy_create_env; 1102 hctx->gw.response = chunk_buffer_acquire(); 1103 hctx->gw.opts.backend = BACKEND_PROXY; 1104 hctx->gw.opts.pdata = hctx; 1105 hctx->gw.opts.headers = proxy_response_headers; 1106 1107 hctx->conf = p->conf; /*(copies struct)*/ 1108 hctx->conf.header.http_host = r->http_host; 1109 hctx->conf.header.upgrade &= (r->http_version == HTTP_VERSION_1_1); 1110 /* mod_proxy currently sends all backend requests as http. 1111 * https-remap is a flag since it might not be needed if backend 1112 * honors Forwarded or X-Forwarded-Proto headers, e.g. by using 1113 * lighttpd mod_extforward or similar functionality in backend*/ 1114 if (hctx->conf.header.https_remap) { 1115 hctx->conf.header.https_remap = 1116 buffer_is_equal_string(&r->uri.scheme, CONST_STR_LEN("https")); 1117 } 1118 1119 if (r->http_method == HTTP_METHOD_CONNECT) { 1120 /*(note: not requiring HTTP/1.1 due to too many non-compliant 1121 * clients such as 'openssl s_client')*/ 1122 if (hctx->conf.header.connect_method) { 1123 hctx->gw.create_env = proxy_create_env_connect; 1124 } 1125 else { 1126 r->http_status = 405; /* Method Not Allowed */ 1127 r->handler_module = NULL; 1128 return HANDLER_FINISHED; 1129 } 1130 } 1131 } 1132 1133 return HANDLER_GO_ON; 1134 } 1135 1136 1137 int mod_proxy_plugin_init(plugin *p); 1138 int mod_proxy_plugin_init(plugin *p) { 1139 p->version = LIGHTTPD_VERSION_ID; 1140 p->name = "proxy"; 1141 1142 p->init = mod_proxy_init; 1143 p->cleanup = mod_proxy_free; 1144 p->set_defaults = mod_proxy_set_defaults; 1145 p->handle_request_reset = gw_handle_request_reset; 1146 p->handle_uri_clean = mod_proxy_check_extension; 1147 p->handle_subrequest = gw_handle_subrequest; 1148 p->handle_trigger = gw_handle_trigger; 1149 p->handle_waitpid = gw_handle_waitpid_cb; 1150 1151 return 0; 1152 } 1153