main/http.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2006, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*!
  20  * \file
  21  * \brief http server for AMI access
  22  *
  23  * \author Mark Spencer <markster@digium.com>
  24  *
  25  * This program implements a tiny http server
  26  * and was inspired by micro-httpd by Jef Poskanzer
  27  *
  28  * \extref GMime http://spruce.sourceforge.net/gmime/
  29  *
  30  * \ref AstHTTP - AMI over the http protocol
  31  */
  32
  33 /*** MODULEINFO
  34         <support_level>core</support_level>
  35  ***/
  36
  37 #include "asterisk.h"
  38
  39 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  40
  41 #include <time.h>
  42 #include <sys/time.h>
  43 #include <sys/stat.h>
  44 #include <sys/signal.h>
  45 #include <fcntl.h>
  46
  47 #include "asterisk/paths.h"     /* use ast_config_AST_DATA_DIR */
  48 #include "asterisk/cli.h"
  49 #include "asterisk/tcptls.h"
  50 #include "asterisk/http.h"
  51 #include "asterisk/utils.h"
  52 #include "asterisk/strings.h"
  53 #include "asterisk/config.h"
  54 #include "asterisk/stringfields.h"
  55 #include "asterisk/ast_version.h"
  56 #include "asterisk/manager.h"
  57 #include "asterisk/_private.h"
  58 #include "asterisk/astobj2.h"
  59 #include "asterisk/netsock2.h"
  60
  61 #define MAX_PREFIX 80
  62 #define DEFAULT_PORT 8088
  63 #define DEFAULT_TLS_PORT 8089
  64 #define DEFAULT_SESSION_LIMIT 100
  65
  66 /* See http.h for more information about the SSL implementation */
  67 #if defined(HAVE_OPENSSL) && (defined(HAVE_FUNOPEN) || defined(HAVE_FOPENCOOKIE))
  68 #define DO_SSL  /* comment in/out if you want to support ssl */
  69 #endif
  70
  71 static int session_limit = DEFAULT_SESSION_LIMIT;
  72 static int session_count = 0;
  73
  74 static struct ast_tls_config http_tls_cfg;
  75
  76 static void *httpd_helper_thread(void *arg);
  77
  78 /*!
  79  * we have up to two accepting threads, one for http, one for https
  80  */
  81 static struct ast_tcptls_session_args http_desc = {
  82         .accept_fd = -1,
  83         .master = AST_PTHREADT_NULL,
  84         .tls_cfg = NULL,
  85         .poll_timeout = -1,
  86         .name = "http server",
  87         .accept_fn = ast_tcptls_server_root,
  88         .worker_fn = httpd_helper_thread,
  89 };
  90
  91 static struct ast_tcptls_session_args https_desc = {
  92         .accept_fd = -1,
  93         .master = AST_PTHREADT_NULL,
  94         .tls_cfg = &http_tls_cfg,
  95         .poll_timeout = -1,
  96         .name = "https server",
  97         .accept_fn = ast_tcptls_server_root,
  98         .worker_fn = httpd_helper_thread,
  99 };
 100
 101 static AST_RWLIST_HEAD_STATIC(uris, ast_http_uri);      /*!< list of supported handlers */
 102
 103 /* all valid URIs must be prepended by the string in prefix. */
 104 static char prefix[MAX_PREFIX];
 105 static int enablestatic;
 106
 107 /*! \brief Limit the kinds of files we're willing to serve up */
 108 static struct {
 109         const char *ext;
 110         const char *mtype;
 111 } mimetypes[] = {
 112         { "png", "image/png" },
 113         { "xml", "text/xml" },
 114         { "jpg", "image/jpeg" },
 115         { "js", "application/x-javascript" },
 116         { "wav", "audio/x-wav" },
 117         { "mp3", "audio/mpeg" },
 118         { "svg", "image/svg+xml" },
 119         { "svgz", "image/svg+xml" },
 120         { "gif", "image/gif" },
 121         { "html", "text/html" },
 122         { "htm", "text/html" },
 123         { "css", "text/css" },
 124         { "cnf", "text/plain" },
 125         { "cfg", "text/plain" },
 126         { "bin", "application/octet-stream" },
 127         { "sbn", "application/octet-stream" },
 128         { "ld", "application/octet-stream" },
 129 };
 130
 131 struct http_uri_redirect {
 132         AST_LIST_ENTRY(http_uri_redirect) entry;
 133         char *dest;
 134         char target[0];
 135 };
 136
 137 static AST_RWLIST_HEAD_STATIC(uri_redirects, http_uri_redirect);
 138
 139 static const struct ast_cfhttp_methods_text {
 140         enum ast_http_method method;
 141         const char *text;
 142 } ast_http_methods_text[] = {
 143         { AST_HTTP_UNKNOWN,     "UNKNOWN" },
 144         { AST_HTTP_GET,         "GET" },
 145         { AST_HTTP_POST,        "POST" },
 146         { AST_HTTP_HEAD,        "HEAD" },
 147         { AST_HTTP_PUT,         "PUT" },
 148 };
 149
 150 const char *ast_get_http_method(enum ast_http_method method)
 151 {
 152         int x;
 153
 154         for (x = 0; x < ARRAY_LEN(ast_http_methods_text); x++) {
 155                 if (ast_http_methods_text[x].method == method) {
 156                         return ast_http_methods_text[x].text;
 157                 }
 158         }
 159
 160         return NULL;
 161 }
 162
 163 const char *ast_http_ftype2mtype(const char *ftype)
 164 {
 165         int x;
 166
 167         if (ftype) {
 168                 for (x = 0; x < ARRAY_LEN(mimetypes); x++) {
 169                         if (!strcasecmp(ftype, mimetypes[x].ext)) {
 170                                 return mimetypes[x].mtype;
 171                         }
 172                 }
 173         }
 174         return NULL;
 175 }
 176
 177 uint32_t ast_http_manid_from_vars(struct ast_variable *headers)
 178 {
 179         uint32_t mngid = 0;
 180         struct ast_variable *v, *cookies;
 181
 182         cookies = ast_http_get_cookies(headers);
 183         for (v = cookies; v; v = v->next) {
 184                 if (!strcasecmp(v->name, "mansession_id")) {
 185                         sscanf(v->value, "%30x", &mngid);
 186                         break;
 187                 }
 188         }
 189         if (cookies) {
 190                 ast_variables_destroy(cookies);
 191         }
 192         return mngid;
 193 }
 194
 195 void ast_http_prefix(char *buf, int len)
 196 {
 197         if (buf) {
 198                 ast_copy_string(buf, prefix, len);
 199         }
 200 }
 201
 202 static int static_callback(struct ast_tcptls_session_instance *ser,
 203         const struct ast_http_uri *urih, const char *uri,
 204         enum ast_http_method method, struct ast_variable *get_vars,
 205         struct ast_variable *headers)
 206 {
 207         char *path;
 208         const char *ftype;
 209         const char *mtype;
 210         char wkspace[80];
 211         struct stat st;
 212         int len;
 213         int fd;
 214         struct ast_str *http_header;
 215         struct timeval tv;
 216         struct ast_tm tm;
 217         char timebuf[80], etag[23];
 218         struct ast_variable *v;
 219         int not_modified = 0;
 220
 221         if (method != AST_HTTP_GET && method != AST_HTTP_HEAD) {
 222                 ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
 223                 return -1;
 224         }
 225
 226         /* Yuck.  I'm not really sold on this, but if you don't deliver static content it makes your configuration
 227            substantially more challenging, but this seems like a rather irritating feature creep on Asterisk. */
 228         if (!enablestatic || ast_strlen_zero(uri)) {
 229                 goto out403;
 230         }
 231
 232         /* Disallow any funny filenames at all */
 233         if ((uri[0] < 33) || strchr("./|~@#$%^&*() \t", uri[0])) {
 234                 goto out403;
 235         }
 236
 237         if (strstr(uri, "/..")) {
 238                 goto out403;
 239         }
 240
 241         if ((ftype = strrchr(uri, '.'))) {
 242                 ftype++;
 243         }
 244
 245         if (!(mtype = ast_http_ftype2mtype(ftype))) {
 246                 snprintf(wkspace, sizeof(wkspace), "text/%s", S_OR(ftype, "plain"));
 247         }
 248
 249         /* Cap maximum length */
 250         if ((len = strlen(uri) + strlen(ast_config_AST_DATA_DIR) + strlen("/static-http/") + 5) > 1024) {
 251                 goto out403;
 252         }
 253
 254         path = alloca(len);
 255         sprintf(path, "%s/static-http/%s", ast_config_AST_DATA_DIR, uri);
 256         if (stat(path, &st)) {
 257                 goto out404;
 258         }
 259
 260         if (S_ISDIR(st.st_mode)) {
 261                 goto out404;
 262         }
 263
 264         fd = open(path, O_RDONLY);
 265         if (fd < 0) {
 266                 goto out403;
 267         }
 268
 269         if (strstr(path, "/private/") && !astman_is_authed(ast_http_manid_from_vars(headers))) {
 270                 goto out403;
 271         }
 272
 273         /* make "Etag:" http header value */
 274         snprintf(etag, sizeof(etag), "\"%ld\"", (long)st.st_mtime);
 275
 276         /* make "Last-Modified:" http header value */
 277         tv.tv_sec = st.st_mtime;
 278         tv.tv_usec = 0;
 279         ast_strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", ast_localtime(&tv, &tm, "GMT"));
 280
 281         /* check received "If-None-Match" request header and Etag value for file */
 282         for (v = headers; v; v = v->next) {
 283                 if (!strcasecmp(v->name, "If-None-Match")) {
 284                         if (!strcasecmp(v->value, etag)) {
 285                                 not_modified = 1;
 286                         }
 287                         break;
 288                 }
 289         }
 290
 291         if ( (http_header = ast_str_create(255)) == NULL) {
 292                 return -1;
 293         }
 294
 295         ast_str_set(&http_header, 0, "Content-type: %s\r\n"
 296                 "ETag: %s\r\n"
 297                 "Last-Modified: %s\r\n",
 298                 mtype,
 299                 etag,
 300                 timebuf);
 301
 302         /* ast_http_send() frees http_header, so we don't need to do it before returning */
 303         if (not_modified) {
 304                 ast_http_send(ser, method, 304, "Not Modified", http_header, NULL, 0, 1);
 305         } else {
 306                 ast_http_send(ser, method, 200, NULL, http_header, NULL, fd, 1); /* static content flag is set */
 307         }
 308         close(fd);
 309         return 0;
 310
 311 out404:
 312         ast_http_error(ser, 404, "Not Found", "The requested URL was not found on this server.");
 313         return -1;
 314
 315 out403:
 316         ast_http_error(ser, 403, "Access Denied", "You do not have permission to access the requested URL.");
 317         return -1;
 318 }
 319
 320 static int httpstatus_callback(struct ast_tcptls_session_instance *ser,
 321         const struct ast_http_uri *urih, const char *uri,
 322         enum ast_http_method method, struct ast_variable *get_vars,
 323         struct ast_variable *headers)
 324 {
 325         struct ast_str *out;
 326         struct ast_variable *v, *cookies = NULL;
 327
 328         if (method != AST_HTTP_GET && method != AST_HTTP_HEAD) {
 329                 ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
 330                 return -1;
 331         }
 332
 333         if ( (out = ast_str_create(512)) == NULL) {
 334                 return -1;
 335         }
 336
 337         ast_str_append(&out, 0,
 338                 "<title>Asterisk HTTP Status</title>\r\n"
 339                 "<body bgcolor=\"#ffffff\">\r\n"
 340                 "<table bgcolor=\"#f1f1f1\" align=\"center\"><tr><td bgcolor=\"#e0e0ff\" colspan=\"2\" width=\"500\">\r\n"
 341                 "<h2>&nbsp;&nbsp;Asterisk&trade; HTTP Status</h2></td></tr>\r\n");
 342
 343         ast_str_append(&out, 0, "<tr><td><i>Prefix</i></td><td><b>%s</b></td></tr>\r\n", prefix);
 344         ast_str_append(&out, 0, "<tr><td><i>Bind Address</i></td><td><b>%s</b></td></tr>\r\n",
 345                        ast_sockaddr_stringify_addr(&http_desc.old_address));
 346         ast_str_append(&out, 0, "<tr><td><i>Bind Port</i></td><td><b>%s</b></td></tr>\r\n",
 347                        ast_sockaddr_stringify_port(&http_desc.old_address));
 348         if (http_tls_cfg.enabled) {
 349                 ast_str_append(&out, 0, "<tr><td><i>SSL Bind Port</i></td><td><b>%s</b></td></tr>\r\n",
 350                                ast_sockaddr_stringify_port(&https_desc.old_address));
 351         }
 352         ast_str_append(&out, 0, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
 353         for (v = get_vars; v; v = v->next) {
 354                 ast_str_append(&out, 0, "<tr><td><i>Submitted GET Variable '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
 355         }
 356         ast_str_append(&out, 0, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
 357
 358         cookies = ast_http_get_cookies(headers);
 359         for (v = cookies; v; v = v->next) {
 360                 ast_str_append(&out, 0, "<tr><td><i>Cookie '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
 361         }
 362         ast_variables_destroy(cookies);
 363
 364         ast_str_append(&out, 0, "</table><center><font size=\"-1\"><i>Asterisk and Digium are registered trademarks of Digium, Inc.</i></font></center></body>\r\n");
 365         ast_http_send(ser, method, 200, NULL, NULL, out, 0, 0);
 366         return 0;
 367 }
 368
 369 static struct ast_http_uri statusuri = {
 370         .callback = httpstatus_callback,
 371         .description = "Asterisk HTTP General Status",
 372         .uri = "httpstatus",
 373         .has_subtree = 0,
 374         .data = NULL,
 375         .key = __FILE__,
 376 };
 377
 378 static struct ast_http_uri staticuri = {
 379         .callback = static_callback,
 380         .description = "Asterisk HTTP Static Delivery",
 381         .uri = "static",
 382         .has_subtree = 1,
 383         .data = NULL,
 384         .key= __FILE__,
 385 };
 386
 387
 388 /* send http/1.1 response */
 389 /* free content variable and close socket*/
 390 void ast_http_send(struct ast_tcptls_session_instance *ser,
 391         enum ast_http_method method, int status_code, const char *status_title,
 392         struct ast_str *http_header, struct ast_str *out, const int fd,
 393         unsigned int static_content)
 394 {
 395         struct timeval now = ast_tvnow();
 396         struct ast_tm tm;
 397         char timebuf[80];
 398         int content_length = 0;
 399
 400         if (!ser || 0 == ser->f) {
 401                 return;
 402         }
 403
 404         ast_strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", ast_localtime(&now, &tm, "GMT"));
 405
 406         /* calc content length */
 407         if (out) {
 408                 content_length += strlen(ast_str_buffer(out));
 409         }
 410
 411         if (fd) {
 412                 content_length += lseek(fd, 0, SEEK_END);
 413                 lseek(fd, 0, SEEK_SET);
 414         }
 415
 416         /* send http header */
 417         fprintf(ser->f, "HTTP/1.1 %d %s\r\n"
 418                 "Server: Asterisk/%s\r\n"
 419                 "Date: %s\r\n"
 420                 "Connection: close\r\n"
 421                 "%s"
 422                 "Content-Length: %d\r\n"
 423                 "%s"
 424                 "\r\n",
 425                 status_code, status_title ? status_title : "OK",
 426                 ast_get_version(),
 427                 timebuf,
 428                 static_content ? "" : "Cache-Control: no-cache, no-store\r\n",
 429                 content_length,
 430                 http_header ? ast_str_buffer(http_header) : ""
 431                 );
 432
 433         /* send content */
 434         if (method != AST_HTTP_HEAD || status_code >= 400) {
 435                 if (out) {
 436                         fprintf(ser->f, "%s", ast_str_buffer(out));
 437                 }
 438
 439                 if (fd) {
 440                         char buf[256];
 441                         int len;
 442                         while ((len = read(fd, buf, sizeof(buf))) > 0) {
 443                                 if (fwrite(buf, len, 1, ser->f) != 1) {
 444                                         ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
 445                                         break;
 446                                 }
 447                         }
 448                 }
 449         }
 450
 451         if (http_header) {
 452                 ast_free(http_header);
 453         }
 454         if (out) {
 455                 ast_free(out);
 456         }
 457
 458         fclose(ser->f);
 459         ser->f = 0;
 460         return;
 461 }
 462
 463 /* Send http "401 Unauthorized" responce and close socket*/
 464 void ast_http_auth(struct ast_tcptls_session_instance *ser, const char *realm,
 465         const unsigned long nonce, const unsigned long opaque, int stale,
 466         const char *text)
 467 {
 468         struct ast_str *http_headers = ast_str_create(128);
 469         struct ast_str *out = ast_str_create(512);
 470
 471         if (!http_headers || !out) {
 472                 ast_free(http_headers);
 473                 ast_free(out);
 474                 return;
 475         }
 476
 477         ast_str_set(&http_headers, 0,
 478                 "WWW-authenticate: Digest algorithm=MD5, realm=\"%s\", nonce=\"%08lx\", qop=\"auth\", opaque=\"%08lx\"%s\r\n"
 479                 "Content-type: text/html\r\n",
 480                 realm ? realm : "Asterisk",
 481                 nonce,
 482                 opaque,
 483                 stale ? ", stale=true" : "");
 484
 485         ast_str_set(&out, 0,
 486                 "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n"
 487                 "<html><head>\r\n"
 488                 "<title>401 Unauthorized</title>\r\n"
 489                 "</head><body>\r\n"
 490                 "<h1>401 Unauthorized</h1>\r\n"
 491                 "<p>%s</p>\r\n"
 492                 "<hr />\r\n"
 493                 "<address>Asterisk Server</address>\r\n"
 494                 "</body></html>\r\n",
 495                 text ? text : "");
 496
 497         ast_http_send(ser, AST_HTTP_UNKNOWN, 401, "Unauthorized", http_headers, out, 0, 0);
 498         return;
 499 }
 500
 501 /* send http error response and close socket*/
 502 void ast_http_error(struct ast_tcptls_session_instance *ser, int status_code, const char *status_title, const char *text)
 503 {
 504         struct ast_str *http_headers = ast_str_create(40);
 505         struct ast_str *out = ast_str_create(256);
 506
 507         if (!http_headers || !out) {
 508                 ast_free(http_headers);
 509                 ast_free(out);
 510                 return;
 511         }
 512
 513         ast_str_set(&http_headers, 0, "Content-type: text/html\r\n");
 514
 515         ast_str_set(&out, 0,
 516                 "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n"
 517                 "<html><head>\r\n"
 518                 "<title>%d %s</title>\r\n"
 519                 "</head><body>\r\n"
 520                 "<h1>%s</h1>\r\n"
 521                 "<p>%s</p>\r\n"
 522                 "<hr />\r\n"
 523                 "<address>Asterisk Server</address>\r\n"
 524                 "</body></html>\r\n",
 525                         status_code, status_title, status_title, text);
 526
 527         ast_http_send(ser, AST_HTTP_UNKNOWN, status_code, status_title, http_headers, out, 0, 0);
 528         return;
 529 }
 530
 531 /*! \brief
 532  * Link the new uri into the list.
 533  *
 534  * They are sorted by length of
 535  * the string, not alphabetically. Duplicate entries are not replaced,
 536  * but the insertion order (using <= and not just <) makes sure that
 537  * more recent insertions hide older ones.
 538  * On a lookup, we just scan the list and stop at the first matching entry.
 539  */
 540 int ast_http_uri_link(struct ast_http_uri *urih)
 541 {
 542         struct ast_http_uri *uri;
 543         int len = strlen(urih->uri);
 544
 545         AST_RWLIST_WRLOCK(&uris);
 546
 547         if ( AST_RWLIST_EMPTY(&uris) || strlen(AST_RWLIST_FIRST(&uris)->uri) <= len ) {
 548                 AST_RWLIST_INSERT_HEAD(&uris, urih, entry);
 549                 AST_RWLIST_UNLOCK(&uris);
 550                 return 0;
 551         }
 552
 553         AST_RWLIST_TRAVERSE(&uris, uri, entry) {
 554                 if (AST_RWLIST_NEXT(uri, entry) &&
 555                         strlen(AST_RWLIST_NEXT(uri, entry)->uri) <= len) {
 556                         AST_RWLIST_INSERT_AFTER(&uris, uri, urih, entry);
 557                         AST_RWLIST_UNLOCK(&uris);
 558
 559                         return 0;
 560                 }
 561         }
 562
 563         AST_RWLIST_INSERT_TAIL(&uris, urih, entry);
 564
 565         AST_RWLIST_UNLOCK(&uris);
 566
 567         return 0;
 568 }
 569
 570 void ast_http_uri_unlink(struct ast_http_uri *urih)
 571 {
 572         AST_RWLIST_WRLOCK(&uris);
 573         AST_RWLIST_REMOVE(&uris, urih, entry);
 574         AST_RWLIST_UNLOCK(&uris);
 575 }
 576
 577 void ast_http_uri_unlink_all_with_key(const char *key)
 578 {
 579         struct ast_http_uri *urih;
 580         AST_RWLIST_WRLOCK(&uris);
 581         AST_RWLIST_TRAVERSE_SAFE_BEGIN(&uris, urih, entry) {
 582                 if (!strcmp(urih->key, key)) {
 583                         AST_RWLIST_REMOVE_CURRENT(entry);
 584                 }
 585                 if (urih->dmallocd) {
 586                         ast_free(urih->data);
 587                 }
 588                 if (urih->mallocd) {
 589                         ast_free(urih);
 590                 }
 591         }
 592         AST_RWLIST_TRAVERSE_SAFE_END;
 593         AST_RWLIST_UNLOCK(&uris);
 594 }
 595
 596 /*
 597  * get post variables from client Request Entity-Body, if content type is
 598  * application/x-www-form-urlencoded
 599  */
 600 struct ast_variable *ast_http_get_post_vars(
 601         struct ast_tcptls_session_instance *ser, struct ast_variable *headers)
 602 {
 603         int content_length = 0;
 604         struct ast_variable *v, *post_vars=NULL, *prev = NULL;
 605         char *buf, *var, *val;
 606
 607         for (v = headers; v; v = v->next) {
 608                 if (!strcasecmp(v->name, "Content-Type")) {
 609                         if (strcasecmp(v->value, "application/x-www-form-urlencoded")) {
 610                                 return NULL;
 611                         }
 612                         break;
 613                 }
 614         }
 615
 616         for (v = headers; v; v = v->next) {
 617                 if (!strcasecmp(v->name, "Content-Length")) {
 618                         content_length = atoi(v->value) + 1;
 619                         break;
 620                 }
 621         }
 622
 623         if (!content_length) {
 624                 return NULL;
 625         }
 626
 627         if (!(buf = alloca(content_length))) {
 628                 return NULL;
 629         }
 630         if (!fgets(buf, content_length, ser->f)) {
 631                 return NULL;
 632         }
 633
 634         while ((val = strsep(&buf, "&"))) {
 635                 var = strsep(&val, "=");
 636                 if (val) {
 637                         ast_uri_decode(val, ast_uri_http_legacy);
 638                 } else  {
 639                         val = "";
 640                 }
 641                 ast_uri_decode(var, ast_uri_http_legacy);
 642                 if ((v = ast_variable_new(var, val, ""))) {
 643                         if (post_vars) {
 644                                 prev->next = v;
 645                         } else {
 646                                 post_vars = v;
 647                         }
 648                         prev = v;
 649                 }
 650         }
 651         return post_vars;
 652 }
 653
 654 static int handle_uri(struct ast_tcptls_session_instance *ser, char *uri,
 655         enum ast_http_method method, struct ast_variable *headers)
 656 {
 657         char *c;
 658         int res = -1;
 659         char *params = uri;
 660         struct ast_http_uri *urih = NULL;
 661         int l;
 662         struct ast_variable *get_vars = NULL, *v, *prev = NULL;
 663         struct http_uri_redirect *redirect;
 664
 665         ast_debug(2, "HTTP Request URI is %s \n", uri);
 666
 667         strsep(&params, "?");
 668         /* Extract arguments from the request and store them in variables. */
 669         if (params) {
 670                 char *var, *val;
 671
 672                 while ((val = strsep(&params, "&"))) {
 673                         var = strsep(&val, "=");
 674                         if (val) {
 675                                 ast_uri_decode(val, ast_uri_http_legacy);
 676                         } else  {
 677                                 val = "";
 678                         }
 679                         ast_uri_decode(var, ast_uri_http_legacy);
 680                         if ((v = ast_variable_new(var, val, ""))) {
 681                                 if (get_vars) {
 682                                         prev->next = v;
 683                                 } else {
 684                                         get_vars = v;
 685                                 }
 686                                 prev = v;
 687                         }
 688                 }
 689         }
 690         ast_uri_decode(uri, ast_uri_http_legacy);
 691
 692         AST_RWLIST_RDLOCK(&uri_redirects);
 693         AST_RWLIST_TRAVERSE(&uri_redirects, redirect, entry) {
 694                 if (!strcasecmp(uri, redirect->target)) {
 695                         struct ast_str *http_header = ast_str_create(128);
 696                         ast_str_set(&http_header, 0, "Location: %s\r\n", redirect->dest);
 697                         ast_http_send(ser, method, 302, "Moved Temporarily", http_header, NULL, 0, 0);
 698
 699                         break;
 700                 }
 701         }
 702         AST_RWLIST_UNLOCK(&uri_redirects);
 703         if (redirect) {
 704                 goto cleanup;
 705         }
 706
 707         /* We want requests to start with the (optional) prefix and '/' */
 708         l = strlen(prefix);
 709         if (!strncasecmp(uri, prefix, l) && uri[l] == '/') {
 710                 uri += l + 1;
 711                 /* scan registered uris to see if we match one. */
 712                 AST_RWLIST_RDLOCK(&uris);
 713                 AST_RWLIST_TRAVERSE(&uris, urih, entry) {
 714                         ast_debug(2, "match request [%s] with handler [%s] len %d\n", uri, urih->uri, l);
 715                         l = strlen(urih->uri);
 716                         c = uri + l;    /* candidate */
 717                         if (strncasecmp(urih->uri, uri, l) /* no match */
 718                             || (*c && *c != '/')) { /* substring */
 719                                 continue;
 720                         }
 721                         if (*c == '/') {
 722                                 c++;
 723                         }
 724                         if (!*c || urih->has_subtree) {
 725                                 uri = c;
 726                                 break;
 727                         }
 728                 }
 729                 AST_RWLIST_UNLOCK(&uris);
 730         }
 731         if (urih) {
 732                 res = urih->callback(ser, urih, uri, method, get_vars, headers);
 733         } else {
 734                 ast_http_error(ser, 404, "Not Found", "The requested URL was not found on this server.");
 735         }
 736
 737 cleanup:
 738         ast_variables_destroy(get_vars);
 739         return res;
 740 }
 741
 742 #ifdef DO_SSL
 743 #if defined(HAVE_FUNOPEN)
 744 #define HOOK_T int
 745 #define LEN_T int
 746 #else
 747 #define HOOK_T ssize_t
 748 #define LEN_T size_t
 749 #endif
 750
 751 /*!
 752  * replacement read/write functions for SSL support.
 753  * We use wrappers rather than SSL_read/SSL_write directly so
 754  * we can put in some debugging.
 755  */
 756 /*static HOOK_T ssl_read(void *cookie, char *buf, LEN_T len)
 757 {
 758         int i = SSL_read(cookie, buf, len-1);
 759 #if 0
 760         if (i >= 0)
 761                 buf[i] = '\0';
 762         ast_verbose("ssl read size %d returns %d <%s>\n", (int)len, i, buf);
 763 #endif
 764         return i;
 765 }
 766
 767 static HOOK_T ssl_write(void *cookie, const char *buf, LEN_T len)
 768 {
 769 #if 0
 770         char *s = alloca(len+1);
 771         strncpy(s, buf, len);
 772         s[len] = '\0';
 773         ast_verbose("ssl write size %d <%s>\n", (int)len, s);
 774 #endif
 775         return SSL_write(cookie, buf, len);
 776 }
 777
 778 static int ssl_close(void *cookie)
 779 {
 780         close(SSL_get_fd(cookie));
 781         SSL_shutdown(cookie);
 782         SSL_free(cookie);
 783         return 0;
 784 }*/
 785 #endif  /* DO_SSL */
 786
 787 static struct ast_variable *parse_cookies(char *cookies)
 788 {
 789         char *cur;
 790         struct ast_variable *vars = NULL, *var;
 791
 792         while ((cur = strsep(&cookies, ";"))) {
 793                 char *name, *val;
 794
 795                 name = val = cur;
 796                 strsep(&val, "=");
 797
 798                 if (ast_strlen_zero(name) || ast_strlen_zero(val)) {
 799                         continue;
 800                 }
 801
 802                 name = ast_strip(name);
 803                 val = ast_strip_quoted(val, "\"", "\"");
 804
 805                 if (ast_strlen_zero(name) || ast_strlen_zero(val)) {
 806                         continue;
 807                 }
 808
 809                 ast_debug(1, "HTTP Cookie, Name: '%s'  Value: '%s'\n", name, val);
 810
 811                 var = ast_variable_new(name, val, __FILE__);
 812                 var->next = vars;
 813                 vars = var;
 814         }
 815
 816         return vars;
 817 }
 818
 819 /* get cookie from Request headers */
 820 struct ast_variable *ast_http_get_cookies(struct ast_variable *headers)
 821 {
 822         struct ast_variable *v, *cookies=NULL;
 823
 824         for (v = headers; v; v = v->next) {
 825                 if (!strncasecmp(v->name, "Cookie", 6)) {
 826                         char *tmp = ast_strdupa(v->value);
 827                         if (cookies) {
 828                                 ast_variables_destroy(cookies);
 829                         }
 830
 831                         cookies = parse_cookies(tmp);
 832                 }
 833         }
 834         return cookies;
 835 }
 836
 837
 838 static void *httpd_helper_thread(void *data)
 839 {
 840         char buf[4096];
 841         char header_line[4096];
 842         struct ast_tcptls_session_instance *ser = data;
 843         struct ast_variable *headers = NULL;
 844         struct ast_variable *tail = headers;
 845         char *uri, *method;
 846         enum ast_http_method http_method = AST_HTTP_UNKNOWN;
 847
 848         if (ast_atomic_fetchadd_int(&session_count, +1) >= session_limit) {
 849                 goto done;
 850         }
 851
 852         if (!fgets(buf, sizeof(buf), ser->f)) {
 853                 goto done;
 854         }
 855
 856         /* Get method */
 857         method = ast_skip_blanks(buf);
 858         uri = ast_skip_nonblanks(method);
 859         if (*uri) {
 860                 *uri++ = '\0';
 861         }
 862
 863         if (!strcasecmp(method,"GET")) {
 864                 http_method = AST_HTTP_GET;
 865         } else if (!strcasecmp(method,"POST")) {
 866                 http_method = AST_HTTP_POST;
 867         } else if (!strcasecmp(method,"HEAD")) {
 868                 http_method = AST_HTTP_HEAD;
 869         } else if (!strcasecmp(method,"PUT")) {
 870                 http_method = AST_HTTP_PUT;
 871         }
 872
 873         uri = ast_skip_blanks(uri);     /* Skip white space */
 874
 875         if (*uri) {                     /* terminate at the first blank */
 876                 char *c = ast_skip_nonblanks(uri);
 877
 878                 if (*c) {
 879                         *c = '\0';
 880                 }
 881         }
 882
 883         /* process "Request Headers" lines */
 884         while (fgets(header_line, sizeof(header_line), ser->f)) {
 885                 char *name, *value;
 886
 887                 /* Trim trailing characters */
 888                 ast_trim_blanks(header_line);
 889                 if (ast_strlen_zero(header_line)) {
 890                         break;
 891                 }
 892
 893                 value = header_line;
 894                 name = strsep(&value, ":");
 895                 if (!value) {
 896                         continue;
 897                 }
 898
 899                 value = ast_skip_blanks(value);
 900                 if (ast_strlen_zero(value) || ast_strlen_zero(name)) {
 901                         continue;
 902                 }
 903
 904                 ast_trim_blanks(name);
 905
 906                 if (!headers) {
 907                         headers = ast_variable_new(name, value, __FILE__);
 908                         tail = headers;
 909                 } else {
 910                         tail->next = ast_variable_new(name, value, __FILE__);
 911                         tail = tail->next;
 912                 }
 913         }
 914
 915         if (!*uri) {
 916                 ast_http_error(ser, 400, "Bad Request", "Invalid Request");
 917                 goto done;
 918         }
 919
 920         handle_uri(ser, uri, http_method, headers);
 921
 922 done:
 923         ast_atomic_fetchadd_int(&session_count, -1);
 924
 925         /* clean up all the header information */
 926         if (headers) {
 927                 ast_variables_destroy(headers);
 928         }
 929
 930         if (ser->f) {
 931                 fclose(ser->f);
 932         }
 933         ao2_ref(ser, -1);
 934         ser = NULL;
 935         return NULL;
 936 }
 937
 938 /*!
 939  * \brief Add a new URI redirect
 940  * The entries in the redirect list are sorted by length, just like the list
 941  * of URI handlers.
 942  */
 943 static void add_redirect(const char *value)
 944 {
 945         char *target, *dest;
 946         struct http_uri_redirect *redirect, *cur;
 947         unsigned int target_len;
 948         unsigned int total_len;
 949
 950         dest = ast_strdupa(value);
 951         dest = ast_skip_blanks(dest);
 952         target = strsep(&dest, " ");
 953         target = ast_skip_blanks(target);
 954         target = strsep(&target, " "); /* trim trailing whitespace */
 955
 956         if (!dest) {
 957                 ast_log(LOG_WARNING, "Invalid redirect '%s'\n", value);
 958                 return;
 959         }
 960
 961         target_len = strlen(target) + 1;
 962         total_len = sizeof(*redirect) + target_len + strlen(dest) + 1;
 963
 964         if (!(redirect = ast_calloc(1, total_len))) {
 965                 return;
 966         }
 967         redirect->dest = redirect->target + target_len;
 968         strcpy(redirect->target, target);
 969         strcpy(redirect->dest, dest);
 970
 971         AST_RWLIST_WRLOCK(&uri_redirects);
 972
 973         target_len--; /* So we can compare directly with strlen() */
 974         if (AST_RWLIST_EMPTY(&uri_redirects)
 975                 || strlen(AST_RWLIST_FIRST(&uri_redirects)->target) <= target_len ) {
 976                 AST_RWLIST_INSERT_HEAD(&uri_redirects, redirect, entry);
 977                 AST_RWLIST_UNLOCK(&uri_redirects);
 978
 979                 return;
 980         }
 981
 982         AST_RWLIST_TRAVERSE(&uri_redirects, cur, entry) {
 983                 if (AST_RWLIST_NEXT(cur, entry)
 984                         && strlen(AST_RWLIST_NEXT(cur, entry)->target) <= target_len ) {
 985                         AST_RWLIST_INSERT_AFTER(&uri_redirects, cur, redirect, entry);
 986                         AST_RWLIST_UNLOCK(&uri_redirects);
 987                         return;
 988                 }
 989         }
 990
 991         AST_RWLIST_INSERT_TAIL(&uri_redirects, redirect, entry);
 992
 993         AST_RWLIST_UNLOCK(&uri_redirects);
 994 }
 995
 996 static int __ast_http_load(int reload)
 997 {
 998         struct ast_config *cfg;
 999         struct ast_variable *v;
1000         int enabled=0;
1001         int newenablestatic=0;
1002         char newprefix[MAX_PREFIX] = "";
1003         struct http_uri_redirect *redirect;
1004         struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
1005         uint32_t bindport = DEFAULT_PORT;
1006         struct ast_sockaddr *addrs = NULL;
1007         int num_addrs = 0;
1008         int http_tls_was_enabled = 0;
1009
1010         cfg = ast_config_load2("http.conf", "http", config_flags);
1011         if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEUNCHANGED || cfg == CONFIG_STATUS_FILEINVALID) {
1012                 return 0;
1013         }
1014
1015         http_tls_was_enabled = (reload && http_tls_cfg.enabled);
1016
1017         http_tls_cfg.enabled = 0;
1018         if (http_tls_cfg.certfile) {
1019                 ast_free(http_tls_cfg.certfile);
1020         }
1021         http_tls_cfg.certfile = ast_strdup(AST_CERTFILE);
1022
1023         if (http_tls_cfg.pvtfile) {
1024                 ast_free(http_tls_cfg.pvtfile);
1025         }
1026         http_tls_cfg.pvtfile = ast_strdup("");
1027
1028         if (http_tls_cfg.cipher) {
1029                 ast_free(http_tls_cfg.cipher);
1030         }
1031         http_tls_cfg.cipher = ast_strdup("");
1032
1033         AST_RWLIST_WRLOCK(&uri_redirects);
1034         while ((redirect = AST_RWLIST_REMOVE_HEAD(&uri_redirects, entry))) {
1035                 ast_free(redirect);
1036         }
1037         AST_RWLIST_UNLOCK(&uri_redirects);
1038
1039         ast_sockaddr_setnull(&https_desc.local_address);
1040
1041         if (cfg) {
1042                 v = ast_variable_browse(cfg, "general");
1043                 for (; v; v = v->next) {
1044
1045                         /* handle tls conf */
1046                         if (!ast_tls_read_conf(&http_tls_cfg, &https_desc, v->name, v->value)) {
1047                                 continue;
1048                         }
1049
1050                         if (!strcasecmp(v->name, "enabled")) {
1051                                 enabled = ast_true(v->value);
1052                         } else if (!strcasecmp(v->name, "enablestatic")) {
1053                                 newenablestatic = ast_true(v->value);
1054                         } else if (!strcasecmp(v->name, "bindport")) {
1055                                 if (ast_parse_arg(v->value, PARSE_UINT32 | PARSE_IN_RANGE | PARSE_DEFAULT, &bindport, DEFAULT_PORT, 0, 65535)) {
1056                                         ast_log(LOG_WARNING, "Invalid port %s specified. Using default port %"PRId32, v->value, DEFAULT_PORT);
1057                                 }
1058                         } else if (!strcasecmp(v->name, "bindaddr")) {
1059                                 if (!(num_addrs = ast_sockaddr_resolve(&addrs, v->value, 0, AST_AF_UNSPEC))) {
1060                                         ast_log(LOG_WARNING, "Invalid bind address %s\n", v->value);
1061                                 } else {
1062                                         ast_log(LOG_WARNING, "Got %d addresses\n", num_addrs);
1063                                 }
1064                         } else if (!strcasecmp(v->name, "prefix")) {
1065                                 if (!ast_strlen_zero(v->value)) {
1066                                         newprefix[0] = '/';
1067                                         ast_copy_string(newprefix + 1, v->value, sizeof(newprefix) - 1);
1068                                 } else {
1069                                         newprefix[0] = '\0';
1070                                 }
1071                         } else if (!strcasecmp(v->name, "redirect")) {
1072                                 add_redirect(v->value);
1073                         } else if (!strcasecmp(v->name, "sessionlimit")) {
1074                                 if (ast_parse_arg(v->value, PARSE_INT32|PARSE_DEFAULT|PARSE_IN_RANGE,
1075                                                         &session_limit, DEFAULT_SESSION_LIMIT, 1, INT_MAX)) {
1076                                         ast_log(LOG_WARNING, "Invalid %s '%s' at line %d of http.conf\n",
1077                                                         v->name, v->value, v->lineno);
1078                                 }
1079                         } else {
1080                                 ast_log(LOG_WARNING, "Ignoring unknown option '%s' in http.conf\n", v->name);
1081                         }
1082                 }
1083
1084                 ast_config_destroy(cfg);
1085         }
1086
1087         if (strcmp(prefix, newprefix)) {
1088                 ast_copy_string(prefix, newprefix, sizeof(prefix));
1089         }
1090         enablestatic = newenablestatic;
1091
1092         if (num_addrs && enabled) {
1093                 int i;
1094                 for (i = 0; i < num_addrs; ++i) {
1095                         ast_sockaddr_copy(&http_desc.local_address, &addrs[i]);
1096                         if (!ast_sockaddr_port(&http_desc.local_address)) {
1097                                 ast_sockaddr_set_port(&http_desc.local_address, bindport);
1098                         }
1099                         ast_tcptls_server_start(&http_desc);
1100                         if (http_desc.accept_fd == -1) {
1101                                 ast_log(LOG_WARNING, "Failed to start HTTP server for address %s\n", ast_sockaddr_stringify(&addrs[i]));
1102                                 ast_sockaddr_setnull(&http_desc.local_address);
1103                         } else {
1104                                 ast_verb(1, "Bound HTTP server to address %s\n", ast_sockaddr_stringify(&addrs[i]));
1105                                 break;
1106                         }
1107                 }
1108                 /* When no specific TLS bindaddr is specified, we just use
1109                  * the non-TLS bindaddress here.
1110                  */
1111                 if (ast_sockaddr_isnull(&https_desc.local_address) && http_desc.accept_fd != -1) {
1112                         ast_sockaddr_copy(&https_desc.local_address, &https_desc.local_address);
1113                         /* Of course, we can't use the same port though.
1114                          * Since no bind address was specified, we just use the
1115                          * default TLS port
1116                          */
1117                         ast_sockaddr_set_port(&https_desc.local_address, DEFAULT_TLS_PORT);
1118                 }
1119         }
1120         if (http_tls_was_enabled && !http_tls_cfg.enabled) {
1121                 ast_tcptls_server_stop(&https_desc);
1122         } else if (http_tls_cfg.enabled && !ast_sockaddr_isnull(&https_desc.local_address)) {
1123                 /* We can get here either because a TLS-specific address was specified
1124                  * or because we copied the non-TLS address here. In the case where
1125                  * we read an explicit address from the config, there may have been
1126                  * no port specified, so we'll just use the default TLS port.
1127                  */
1128                 if (!ast_sockaddr_port(&https_desc.local_address)) {
1129                         ast_sockaddr_set_port(&https_desc.local_address, DEFAULT_TLS_PORT);
1130                 }
1131                 if (ast_ssl_setup(https_desc.tls_cfg)) {
1132                         ast_tcptls_server_start(&https_desc);
1133                 }
1134         }
1135
1136         return 0;
1137 }
1138
1139 static char *handle_show_http(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1140 {
1141         struct ast_http_uri *urih;
1142         struct http_uri_redirect *redirect;
1143
1144         switch (cmd) {
1145         case CLI_INIT:
1146                 e->command = "http show status";
1147                 e->usage =
1148                         "Usage: http show status\n"
1149                         "       Lists status of internal HTTP engine\n";
1150                 return NULL;
1151         case CLI_GENERATE:
1152                 return NULL;
1153         }
1154
1155         if (a->argc != 3) {
1156                 return CLI_SHOWUSAGE;
1157         }
1158         ast_cli(a->fd, "HTTP Server Status:\n");
1159         ast_cli(a->fd, "Prefix: %s\n", prefix);
1160         if (ast_sockaddr_isnull(&http_desc.old_address)) {
1161                 ast_cli(a->fd, "Server Disabled\n\n");
1162         } else {
1163                 ast_cli(a->fd, "Server Enabled and Bound to %s\n\n",
1164                         ast_sockaddr_stringify(&http_desc.old_address));
1165                 if (http_tls_cfg.enabled) {
1166                         ast_cli(a->fd, "HTTPS Server Enabled and Bound to %s\n\n",
1167                                 ast_sockaddr_stringify(&https_desc.old_address));
1168                 }
1169         }
1170
1171         ast_cli(a->fd, "Enabled URI's:\n");
1172         AST_RWLIST_RDLOCK(&uris);
1173         if (AST_RWLIST_EMPTY(&uris)) {
1174                 ast_cli(a->fd, "None.\n");
1175         } else {
1176                 AST_RWLIST_TRAVERSE(&uris, urih, entry)
1177                         ast_cli(a->fd, "%s/%s%s => %s\n", prefix, urih->uri, (urih->has_subtree ? "/..." : "" ), urih->description);
1178         }
1179         AST_RWLIST_UNLOCK(&uris);
1180
1181         ast_cli(a->fd, "\nEnabled Redirects:\n");
1182         AST_RWLIST_RDLOCK(&uri_redirects);
1183         AST_RWLIST_TRAVERSE(&uri_redirects, redirect, entry)
1184                 ast_cli(a->fd, "  %s => %s\n", redirect->target, redirect->dest);
1185         if (AST_RWLIST_EMPTY(&uri_redirects)) {
1186                 ast_cli(a->fd, "  None.\n");
1187         }
1188         AST_RWLIST_UNLOCK(&uri_redirects);
1189
1190         return CLI_SUCCESS;
1191 }
1192
1193 int ast_http_reload(void)
1194 {
1195         return __ast_http_load(1);
1196 }
1197
1198 static struct ast_cli_entry cli_http[] = {
1199         AST_CLI_DEFINE(handle_show_http, "Display HTTP server status"),
1200 };
1201
1202 int ast_http_init(void)
1203 {
1204         ast_http_uri_link(&statusuri);
1205         ast_http_uri_link(&staticuri);
1206         ast_cli_register_multiple(cli_http, ARRAY_LEN(cli_http));
1207
1208         return __ast_http_load(0);
1209 }