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  * GMime http://spruce.sourceforge.net/gmime/
  29  *
  30  * \ref AstHTTP - AMI over the http protocol
  31  */
  32
  33 /*! \li \ref http.c uses the configuration file \ref http.conf
  34  * \addtogroup configuration_file
  35  */
  36
  37 /*! \page http.conf http.conf
  38  * \verbinclude http.conf.sample
  39  */
  40
  41 /*** MODULEINFO
  42         <support_level>core</support_level>
  43  ***/
  44
  45 #include "asterisk.h"
  46
  47 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  48
  49 #include <time.h>
  50 #include <sys/time.h>
  51 #include <sys/stat.h>
  52 #include <sys/signal.h>
  53 #include <fcntl.h>
  54
  55 #include "asterisk/paths.h"     /* use ast_config_AST_DATA_DIR */
  56 #include "asterisk/cli.h"
  57 #include "asterisk/tcptls.h"
  58 #include "asterisk/http.h"
  59 #include "asterisk/utils.h"
  60 #include "asterisk/strings.h"
  61 #include "asterisk/config.h"
  62 #include "asterisk/stringfields.h"
  63 #include "asterisk/ast_version.h"
  64 #include "asterisk/manager.h"
  65 #include "asterisk/_private.h"
  66 #include "asterisk/astobj2.h"
  67 #include "asterisk/netsock2.h"
  68
  69 #define MAX_PREFIX 80
  70 #define DEFAULT_PORT 8088
  71 #define DEFAULT_TLS_PORT 8089
  72 #define DEFAULT_SESSION_LIMIT 100
  73
  74 /* See http.h for more information about the SSL implementation */
  75 #if defined(HAVE_OPENSSL) && (defined(HAVE_FUNOPEN) || defined(HAVE_FOPENCOOKIE))
  76 #define DO_SSL  /* comment in/out if you want to support ssl */
  77 #endif
  78
  79 static int session_limit = DEFAULT_SESSION_LIMIT;
  80 static int session_count = 0;
  81
  82 static struct ast_tls_config http_tls_cfg;
  83
  84 static void *httpd_helper_thread(void *arg);
  85
  86 /*!
  87  * we have up to two accepting threads, one for http, one for https
  88  */
  89 static struct ast_tcptls_session_args http_desc = {
  90         .accept_fd = -1,
  91         .master = AST_PTHREADT_NULL,
  92         .tls_cfg = NULL,
  93         .poll_timeout = -1,
  94         .name = "http server",
  95         .accept_fn = ast_tcptls_server_root,
  96         .worker_fn = httpd_helper_thread,
  97 };
  98
  99 static struct ast_tcptls_session_args https_desc = {
 100         .accept_fd = -1,
 101         .master = AST_PTHREADT_NULL,
 102         .tls_cfg = &http_tls_cfg,
 103         .poll_timeout = -1,
 104         .name = "https server",
 105         .accept_fn = ast_tcptls_server_root,
 106         .worker_fn = httpd_helper_thread,
 107 };
 108
 109 static AST_RWLIST_HEAD_STATIC(uris, ast_http_uri);      /*!< list of supported handlers */
 110
 111 /* all valid URIs must be prepended by the string in prefix. */
 112 static char prefix[MAX_PREFIX];
 113 static int enablestatic;
 114
 115 /*! \brief Limit the kinds of files we're willing to serve up */
 116 static struct {
 117         const char *ext;
 118         const char *mtype;
 119 } mimetypes[] = {
 120         { "png", "image/png" },
 121         { "xml", "text/xml" },
 122         { "jpg", "image/jpeg" },
 123         { "js", "application/x-javascript" },
 124         { "wav", "audio/x-wav" },
 125         { "mp3", "audio/mpeg" },
 126         { "svg", "image/svg+xml" },
 127         { "svgz", "image/svg+xml" },
 128         { "gif", "image/gif" },
 129         { "html", "text/html" },
 130         { "htm", "text/html" },
 131         { "css", "text/css" },
 132         { "cnf", "text/plain" },
 133         { "cfg", "text/plain" },
 134         { "bin", "application/octet-stream" },
 135         { "sbn", "application/octet-stream" },
 136         { "ld", "application/octet-stream" },
 137 };
 138
 139 struct http_uri_redirect {
 140         AST_LIST_ENTRY(http_uri_redirect) entry;
 141         char *dest;
 142         char target[0];
 143 };
 144
 145 static AST_RWLIST_HEAD_STATIC(uri_redirects, http_uri_redirect);
 146
 147 static const struct ast_cfhttp_methods_text {
 148         enum ast_http_method method;
 149         const char *text;
 150 } ast_http_methods_text[] = {
 151         { AST_HTTP_UNKNOWN,     "UNKNOWN" },
 152         { AST_HTTP_GET,         "GET" },
 153         { AST_HTTP_POST,        "POST" },
 154         { AST_HTTP_HEAD,        "HEAD" },
 155         { AST_HTTP_PUT,         "PUT" },
 156 };
 157
 158 const char *ast_get_http_method(enum ast_http_method method)
 159 {
 160         int x;
 161
 162         for (x = 0; x < ARRAY_LEN(ast_http_methods_text); x++) {
 163                 if (ast_http_methods_text[x].method == method) {
 164                         return ast_http_methods_text[x].text;
 165                 }
 166         }
 167
 168         return NULL;
 169 }
 170
 171 const char *ast_http_ftype2mtype(const char *ftype)
 172 {
 173         int x;
 174
 175         if (ftype) {
 176                 for (x = 0; x < ARRAY_LEN(mimetypes); x++) {
 177                         if (!strcasecmp(ftype, mimetypes[x].ext)) {
 178                                 return mimetypes[x].mtype;
 179                         }
 180                 }
 181         }
 182         return NULL;
 183 }
 184
 185 uint32_t ast_http_manid_from_vars(struct ast_variable *headers)
 186 {
 187         uint32_t mngid = 0;
 188         struct ast_variable *v, *cookies;
 189
 190         cookies = ast_http_get_cookies(headers);
 191         for (v = cookies; v; v = v->next) {
 192                 if (!strcasecmp(v->name, "mansession_id")) {
 193                         sscanf(v->value, "%30x", &mngid);
 194                         break;
 195                 }
 196         }
 197         if (cookies) {
 198                 ast_variables_destroy(cookies);
 199         }
 200         return mngid;
 201 }
 202
 203 void ast_http_prefix(char *buf, int len)
 204 {
 205         if (buf) {
 206                 ast_copy_string(buf, prefix, len);
 207         }
 208 }
 209
 210 static int static_callback(struct ast_tcptls_session_instance *ser,
 211         const struct ast_http_uri *urih, const char *uri,
 212         enum ast_http_method method, struct ast_variable *get_vars,
 213         struct ast_variable *headers)
 214 {
 215         char *path;
 216         const char *ftype;
 217         const char *mtype;
 218         char wkspace[80];
 219         struct stat st;
 220         int len;
 221         int fd;
 222         struct ast_str *http_header;
 223         struct timeval tv;
 224         struct ast_tm tm;
 225         char timebuf[80], etag[23];
 226         struct ast_variable *v;
 227         int not_modified = 0;
 228
 229         if (method != AST_HTTP_GET && method != AST_HTTP_HEAD) {
 230                 ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
 231                 return -1;
 232         }
 233
 234         /* Yuck.  I'm not really sold on this, but if you don't deliver static content it makes your configuration
 235            substantially more challenging, but this seems like a rather irritating feature creep on Asterisk. */
 236         if (!enablestatic || ast_strlen_zero(uri)) {
 237                 goto out403;
 238         }
 239
 240         /* Disallow any funny filenames at all (checking first character only??) */
 241         if ((uri[0] < 33) || strchr("./|~@#$%^&*() \t", uri[0])) {
 242                 goto out403;
 243         }
 244
 245         if (strstr(uri, "/..")) {
 246                 goto out403;
 247         }
 248
 249         if ((ftype = strrchr(uri, '.'))) {
 250                 ftype++;
 251         }
 252
 253         if (!(mtype = ast_http_ftype2mtype(ftype))) {
 254                 snprintf(wkspace, sizeof(wkspace), "text/%s", S_OR(ftype, "plain"));
 255                 mtype = wkspace;
 256         }
 257
 258         /* Cap maximum length */
 259         if ((len = strlen(uri) + strlen(ast_config_AST_DATA_DIR) + strlen("/static-http/") + 5) > 1024) {
 260                 goto out403;
 261         }
 262
 263         path = ast_alloca(len);
 264         sprintf(path, "%s/static-http/%s", ast_config_AST_DATA_DIR, uri);
 265         if (stat(path, &st)) {
 266                 goto out404;
 267         }
 268
 269         if (S_ISDIR(st.st_mode)) {
 270                 goto out404;
 271         }
 272
 273         if (strstr(path, "/private/") && !astman_is_authed(ast_http_manid_from_vars(headers))) {
 274                 goto out403;
 275         }
 276
 277         fd = open(path, O_RDONLY);
 278         if (fd < 0) {
 279                 goto out403;
 280         }
 281
 282         /* make "Etag:" http header value */
 283         snprintf(etag, sizeof(etag), "\"%ld\"", (long)st.st_mtime);
 284
 285         /* make "Last-Modified:" http header value */
 286         tv.tv_sec = st.st_mtime;
 287         tv.tv_usec = 0;
 288         ast_strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", ast_localtime(&tv, &tm, "GMT"));
 289
 290         /* check received "If-None-Match" request header and Etag value for file */
 291         for (v = headers; v; v = v->next) {
 292                 if (!strcasecmp(v->name, "If-None-Match")) {
 293                         if (!strcasecmp(v->value, etag)) {
 294                                 not_modified = 1;
 295                         }
 296                         break;
 297                 }
 298         }
 299
 300         if ( (http_header = ast_str_create(255)) == NULL) {
 301                 close(fd);
 302                 return -1;
 303         }
 304
 305         ast_str_set(&http_header, 0, "Content-type: %s\r\n"
 306                 "ETag: %s\r\n"
 307                 "Last-Modified: %s\r\n",
 308                 mtype,
 309                 etag,
 310                 timebuf);
 311
 312         /* ast_http_send() frees http_header, so we don't need to do it before returning */
 313         if (not_modified) {
 314                 ast_http_send(ser, method, 304, "Not Modified", http_header, NULL, 0, 1);
 315         } else {
 316                 ast_http_send(ser, method, 200, NULL, http_header, NULL, fd, 1); /* static content flag is set */
 317         }
 318         close(fd);
 319         return 0;
 320
 321 out404:
 322         ast_http_error(ser, 404, "Not Found", "The requested URL was not found on this server.");
 323         return -1;
 324
 325 out403:
 326         ast_http_error(ser, 403, "Access Denied", "You do not have permission to access the requested URL.");
 327         return -1;
 328 }
 329
 330 static int httpstatus_callback(struct ast_tcptls_session_instance *ser,
 331         const struct ast_http_uri *urih, const char *uri,
 332         enum ast_http_method method, struct ast_variable *get_vars,
 333         struct ast_variable *headers)
 334 {
 335         struct ast_str *out;
 336         struct ast_variable *v, *cookies = NULL;
 337
 338         if (method != AST_HTTP_GET && method != AST_HTTP_HEAD) {
 339                 ast_http_error(ser, 501, "Not Implemented", "Attempt to use unimplemented / unsupported method");
 340                 return -1;
 341         }
 342
 343         if ( (out = ast_str_create(512)) == NULL) {
 344                 return -1;
 345         }
 346
 347         ast_str_append(&out, 0,
 348                 "<title>Asterisk HTTP Status</title>\r\n"
 349                 "<body bgcolor=\"#ffffff\">\r\n"
 350                 "<table bgcolor=\"#f1f1f1\" align=\"center\"><tr><td bgcolor=\"#e0e0ff\" colspan=\"2\" width=\"500\">\r\n"
 351                 "<h2>&nbsp;&nbsp;Asterisk&trade; HTTP Status</h2></td></tr>\r\n");
 352
 353         ast_str_append(&out, 0, "<tr><td><i>Prefix</i></td><td><b>%s</b></td></tr>\r\n", prefix);
 354         ast_str_append(&out, 0, "<tr><td><i>Bind Address</i></td><td><b>%s</b></td></tr>\r\n",
 355                        ast_sockaddr_stringify_addr(&http_desc.old_address));
 356         ast_str_append(&out, 0, "<tr><td><i>Bind Port</i></td><td><b>%s</b></td></tr>\r\n",
 357                        ast_sockaddr_stringify_port(&http_desc.old_address));
 358         if (http_tls_cfg.enabled) {
 359                 ast_str_append(&out, 0, "<tr><td><i>SSL Bind Port</i></td><td><b>%s</b></td></tr>\r\n",
 360                                ast_sockaddr_stringify_port(&https_desc.old_address));
 361         }
 362         ast_str_append(&out, 0, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
 363         for (v = get_vars; v; v = v->next) {
 364                 ast_str_append(&out, 0, "<tr><td><i>Submitted GET Variable '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
 365         }
 366         ast_str_append(&out, 0, "<tr><td colspan=\"2\"><hr></td></tr>\r\n");
 367
 368         cookies = ast_http_get_cookies(headers);
 369         for (v = cookies; v; v = v->next) {
 370                 ast_str_append(&out, 0, "<tr><td><i>Cookie '%s'</i></td><td>%s</td></tr>\r\n", v->name, v->value);
 371         }
 372         ast_variables_destroy(cookies);
 373
 374         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");
 375         ast_http_send(ser, method, 200, NULL, NULL, out, 0, 0);
 376         return 0;
 377 }
 378
 379 static struct ast_http_uri statusuri = {
 380         .callback = httpstatus_callback,
 381         .description = "Asterisk HTTP General Status",
 382         .uri = "httpstatus",
 383         .has_subtree = 0,
 384         .data = NULL,
 385         .key = __FILE__,
 386 };
 387
 388 static struct ast_http_uri staticuri = {
 389         .callback = static_callback,
 390         .description = "Asterisk HTTP Static Delivery",
 391         .uri = "static",
 392         .has_subtree = 1,
 393         .data = NULL,
 394         .key= __FILE__,
 395 };
 396
 397
 398 /* send http/1.1 response */
 399 /* free content variable and close socket*/
 400 void ast_http_send(struct ast_tcptls_session_instance *ser,
 401         enum ast_http_method method, int status_code, const char *status_title,
 402         struct ast_str *http_header, struct ast_str *out, const int fd,
 403         unsigned int static_content)
 404 {
 405         struct timeval now = ast_tvnow();
 406         struct ast_tm tm;
 407         char timebuf[80];
 408         int content_length = 0;
 409
 410         if (!ser || 0 == ser->f) {
 411                 return;
 412         }
 413
 414         ast_strftime(timebuf, sizeof(timebuf), "%a, %d %b %Y %H:%M:%S GMT", ast_localtime(&now, &tm, "GMT"));
 415
 416         /* calc content length */
 417         if (out) {
 418                 content_length += strlen(ast_str_buffer(out));
 419         }
 420
 421         if (fd) {
 422                 content_length += lseek(fd, 0, SEEK_END);
 423                 lseek(fd, 0, SEEK_SET);
 424         }
 425
 426         /* send http header */
 427         fprintf(ser->f, "HTTP/1.1 %d %s\r\n"
 428                 "Server: Asterisk/%s\r\n"
 429                 "Date: %s\r\n"
 430                 "Connection: close\r\n"
 431                 "%s"
 432                 "Content-Length: %d\r\n"
 433                 "%s"
 434                 "\r\n",
 435                 status_code, status_title ? status_title : "OK",
 436                 ast_get_version(),
 437                 timebuf,
 438                 static_content ? "" : "Cache-Control: no-cache, no-store\r\n",
 439                 content_length,
 440                 http_header ? ast_str_buffer(http_header) : ""
 441                 );
 442
 443         /* send content */
 444         if (method != AST_HTTP_HEAD || status_code >= 400) {
 445                 if (out) {
 446                         fprintf(ser->f, "%s", ast_str_buffer(out));
 447                 }
 448
 449                 if (fd) {
 450                         char buf[256];
 451                         int len;
 452                         while ((len = read(fd, buf, sizeof(buf))) > 0) {
 453                                 if (fwrite(buf, len, 1, ser->f) != 1) {
 454                                         ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
 455                                         break;
 456                                 }
 457                         }
 458                 }
 459         }
 460
 461         if (http_header) {
 462                 ast_free(http_header);
 463         }
 464         if (out) {
 465                 ast_free(out);
 466         }
 467
 468         fclose(ser->f);
 469         ser->f = 0;
 470         return;
 471 }
 472
 473 /* Send http "401 Unauthorized" responce and close socket*/
 474 void ast_http_auth(struct ast_tcptls_session_instance *ser, const char *realm,
 475         const unsigned long nonce, const unsigned long opaque, int stale,
 476         const char *text)
 477 {
 478         struct ast_str *http_headers = ast_str_create(128);
 479         struct ast_str *out = ast_str_create(512);
 480
 481         if (!http_headers || !out) {
 482                 ast_free(http_headers);
 483                 ast_free(out);
 484                 return;
 485         }
 486
 487         ast_str_set(&http_headers, 0,
 488                 "WWW-authenticate: Digest algorithm=MD5, realm=\"%s\", nonce=\"%08lx\", qop=\"auth\", opaque=\"%08lx\"%s\r\n"
 489                 "Content-type: text/html\r\n",
 490                 realm ? realm : "Asterisk",
 491                 nonce,
 492                 opaque,
 493                 stale ? ", stale=true" : "");
 494
 495         ast_str_set(&out, 0,
 496                 "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n"
 497                 "<html><head>\r\n"
 498                 "<title>401 Unauthorized</title>\r\n"
 499                 "</head><body>\r\n"
 500                 "<h1>401 Unauthorized</h1>\r\n"
 501                 "<p>%s</p>\r\n"
 502                 "<hr />\r\n"
 503                 "<address>Asterisk Server</address>\r\n"
 504                 "</body></html>\r\n",
 505                 text ? text : "");
 506
 507         ast_http_send(ser, AST_HTTP_UNKNOWN, 401, "Unauthorized", http_headers, out, 0, 0);
 508         return;
 509 }
 510
 511 /* send http error response and close socket*/
 512 void ast_http_error(struct ast_tcptls_session_instance *ser, int status_code, const char *status_title, const char *text)
 513 {
 514         struct ast_str *http_headers = ast_str_create(40);
 515         struct ast_str *out = ast_str_create(256);
 516
 517         if (!http_headers || !out) {
 518                 ast_free(http_headers);
 519                 ast_free(out);
 520                 return;
 521         }
 522
 523         ast_str_set(&http_headers, 0, "Content-type: text/html\r\n");
 524
 525         ast_str_set(&out, 0,
 526                 "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\r\n"
 527                 "<html><head>\r\n"
 528                 "<title>%d %s</title>\r\n"
 529                 "</head><body>\r\n"
 530                 "<h1>%s</h1>\r\n"
 531                 "<p>%s</p>\r\n"
 532                 "<hr />\r\n"
 533                 "<address>Asterisk Server</address>\r\n"
 534                 "</body></html>\r\n",
 535                         status_code, status_title, status_title, text);
 536
 537         ast_http_send(ser, AST_HTTP_UNKNOWN, status_code, status_title, http_headers, out, 0, 0);
 538         return;
 539 }
 540
 541 /*! \brief
 542  * Link the new uri into the list.
 543  *
 544  * They are sorted by length of
 545  * the string, not alphabetically. Duplicate entries are not replaced,
 546  * but the insertion order (using <= and not just <) makes sure that
 547  * more recent insertions hide older ones.
 548  * On a lookup, we just scan the list and stop at the first matching entry.
 549  */
 550 int ast_http_uri_link(struct ast_http_uri *urih)
 551 {
 552         struct ast_http_uri *uri;
 553         int len = strlen(urih->uri);
 554
 555         AST_RWLIST_WRLOCK(&uris);
 556
 557         if ( AST_RWLIST_EMPTY(&uris) || strlen(AST_RWLIST_FIRST(&uris)->uri) <= len ) {
 558                 AST_RWLIST_INSERT_HEAD(&uris, urih, entry);
 559                 AST_RWLIST_UNLOCK(&uris);
 560                 return 0;
 561         }
 562
 563         AST_RWLIST_TRAVERSE(&uris, uri, entry) {
 564                 if (AST_RWLIST_NEXT(uri, entry) &&
 565                         strlen(AST_RWLIST_NEXT(uri, entry)->uri) <= len) {
 566                         AST_RWLIST_INSERT_AFTER(&uris, uri, urih, entry);
 567                         AST_RWLIST_UNLOCK(&uris);
 568
 569                         return 0;
 570                 }
 571         }
 572
 573         AST_RWLIST_INSERT_TAIL(&uris, urih, entry);
 574
 575         AST_RWLIST_UNLOCK(&uris);
 576
 577         return 0;
 578 }
 579
 580 void ast_http_uri_unlink(struct ast_http_uri *urih)
 581 {
 582         AST_RWLIST_WRLOCK(&uris);
 583         AST_RWLIST_REMOVE(&uris, urih, entry);
 584         AST_RWLIST_UNLOCK(&uris);
 585 }
 586
 587 void ast_http_uri_unlink_all_with_key(const char *key)
 588 {
 589         struct ast_http_uri *urih;
 590         AST_RWLIST_WRLOCK(&uris);
 591         AST_RWLIST_TRAVERSE_SAFE_BEGIN(&uris, urih, entry) {
 592                 if (!strcmp(urih->key, key)) {
 593                         AST_RWLIST_REMOVE_CURRENT(entry);
 594                         if (urih->dmallocd) {
 595                                 ast_free(urih->data);
 596                         }
 597                         if (urih->mallocd) {
 598                                 ast_free(urih);
 599                         }
 600                 }
 601         }
 602         AST_RWLIST_TRAVERSE_SAFE_END;
 603         AST_RWLIST_UNLOCK(&uris);
 604 }
 605
 606 #define MAX_POST_CONTENT 1025
 607
 608 /*
 609  * get post variables from client Request Entity-Body, if content type is
 610  * application/x-www-form-urlencoded
 611  */
 612 struct ast_variable *ast_http_get_post_vars(
 613         struct ast_tcptls_session_instance *ser, struct ast_variable *headers)
 614 {
 615         int content_length = 0;
 616         struct ast_variable *v, *post_vars=NULL, *prev = NULL;
 617         char *buf, *var, *val;
 618         int res;
 619
 620         for (v = headers; v; v = v->next) {
 621                 if (!strcasecmp(v->name, "Content-Type")) {
 622                         if (strcasecmp(v->value, "application/x-www-form-urlencoded")) {
 623                                 return NULL;
 624                         }
 625                         break;
 626                 }
 627         }
 628
 629         for (v = headers; v; v = v->next) {
 630                 if (!strcasecmp(v->name, "Content-Length")) {
 631                         content_length = atoi(v->value);
 632                         break;
 633                 }
 634         }
 635
 636         if (content_length <= 0) {
 637                 return NULL;
 638         }
 639
 640         if (content_length > MAX_POST_CONTENT - 1) {
 641                 ast_log(LOG_WARNING, "Excessively long HTTP content. %d is greater than our max of %d\n",
 642                                 content_length, MAX_POST_CONTENT);
 643                 ast_http_send(ser, AST_HTTP_POST, 413, "Request Entity Too Large", NULL, NULL, 0, 0);
 644                 return NULL;
 645         }
 646
 647         buf = ast_malloc(content_length + 1);
 648         if (!buf) {
 649                 return NULL;
 650         }
 651
 652         res = fread(buf, 1, content_length, ser->f);
 653         if (res < content_length) {
 654                 /* Error, distinguishable by ferror() or feof(), but neither
 655                  * is good. */
 656                 goto done;
 657         }
 658         buf[content_length] = '\0';
 659
 660         while ((val = strsep(&buf, "&"))) {
 661                 var = strsep(&val, "=");
 662                 if (val) {
 663                         ast_uri_decode(val, ast_uri_http_legacy);
 664                 } else  {
 665                         val = "";
 666                 }
 667                 ast_uri_decode(var, ast_uri_http_legacy);
 668                 if ((v = ast_variable_new(var, val, ""))) {
 669                         if (post_vars) {
 670                                 prev->next = v;
 671                         } else {
 672                                 post_vars = v;
 673                         }
 674                         prev = v;
 675                 }
 676         }
 677
 678 done:
 679         ast_free(buf);
 680         return post_vars;
 681 }
 682
 683 static int handle_uri(struct ast_tcptls_session_instance *ser, char *uri,
 684         enum ast_http_method method, struct ast_variable *headers)
 685 {
 686         char *c;
 687         int res = -1;
 688         char *params = uri;
 689         struct ast_http_uri *urih = NULL;
 690         int l;
 691         struct ast_variable *get_vars = NULL, *v, *prev = NULL;
 692         struct http_uri_redirect *redirect;
 693
 694         ast_debug(2, "HTTP Request URI is %s \n", uri);
 695
 696         strsep(&params, "?");
 697         /* Extract arguments from the request and store them in variables. */
 698         if (params) {
 699                 char *var, *val;
 700
 701                 while ((val = strsep(&params, "&"))) {
 702                         var = strsep(&val, "=");
 703                         if (val) {
 704                                 ast_uri_decode(val, ast_uri_http_legacy);
 705                         } else  {
 706                                 val = "";
 707                         }
 708                         ast_uri_decode(var, ast_uri_http_legacy);
 709                         if ((v = ast_variable_new(var, val, ""))) {
 710                                 if (get_vars) {
 711                                         prev->next = v;
 712                                 } else {
 713                                         get_vars = v;
 714                                 }
 715                                 prev = v;
 716                         }
 717                 }
 718         }
 719         ast_uri_decode(uri, ast_uri_http_legacy);
 720
 721         AST_RWLIST_RDLOCK(&uri_redirects);
 722         AST_RWLIST_TRAVERSE(&uri_redirects, redirect, entry) {
 723                 if (!strcasecmp(uri, redirect->target)) {
 724                         struct ast_str *http_header = ast_str_create(128);
 725                         ast_str_set(&http_header, 0, "Location: %s\r\n", redirect->dest);
 726                         ast_http_send(ser, method, 302, "Moved Temporarily", http_header, NULL, 0, 0);
 727
 728                         break;
 729                 }
 730         }
 731         AST_RWLIST_UNLOCK(&uri_redirects);
 732         if (redirect) {
 733                 goto cleanup;
 734         }
 735
 736         /* We want requests to start with the (optional) prefix and '/' */
 737         l = strlen(prefix);
 738         if (!strncasecmp(uri, prefix, l) && uri[l] == '/') {
 739                 uri += l + 1;
 740                 /* scan registered uris to see if we match one. */
 741                 AST_RWLIST_RDLOCK(&uris);
 742                 AST_RWLIST_TRAVERSE(&uris, urih, entry) {
 743                         ast_debug(2, "match request [%s] with handler [%s] len %d\n", uri, urih->uri, l);
 744                         l = strlen(urih->uri);
 745                         c = uri + l;    /* candidate */
 746                         if (strncasecmp(urih->uri, uri, l) /* no match */
 747                             || (*c && *c != '/')) { /* substring */
 748                                 continue;
 749                         }
 750                         if (*c == '/') {
 751                                 c++;
 752                         }
 753                         if (!*c || urih->has_subtree) {
 754                                 uri = c;
 755                                 break;
 756                         }
 757                 }
 758                 AST_RWLIST_UNLOCK(&uris);
 759         }
 760         if (urih) {
 761                 res = urih->callback(ser, urih, uri, method, get_vars, headers);
 762         } else {
 763                 ast_http_error(ser, 404, "Not Found", "The requested URL was not found on this server.");
 764         }
 765
 766 cleanup:
 767         ast_variables_destroy(get_vars);
 768         return res;
 769 }
 770
 771 #ifdef DO_SSL
 772 #if defined(HAVE_FUNOPEN)
 773 #define HOOK_T int
 774 #define LEN_T int
 775 #else
 776 #define HOOK_T ssize_t
 777 #define LEN_T size_t
 778 #endif
 779
 780 /*!
 781  * replacement read/write functions for SSL support.
 782  * We use wrappers rather than SSL_read/SSL_write directly so
 783  * we can put in some debugging.
 784  */
 785 /*static HOOK_T ssl_read(void *cookie, char *buf, LEN_T len)
 786 {
 787         int i = SSL_read(cookie, buf, len-1);
 788 #if 0
 789         if (i >= 0)
 790                 buf[i] = '\0';
 791         ast_verbose("ssl read size %d returns %d <%s>\n", (int)len, i, buf);
 792 #endif
 793         return i;
 794 }
 795
 796 static HOOK_T ssl_write(void *cookie, const char *buf, LEN_T len)
 797 {
 798 #if 0
 799         char *s = ast_alloca(len+1);
 800         strncpy(s, buf, len);
 801         s[len] = '\0';
 802         ast_verbose("ssl write size %d <%s>\n", (int)len, s);
 803 #endif
 804         return SSL_write(cookie, buf, len);
 805 }
 806
 807 static int ssl_close(void *cookie)
 808 {
 809         close(SSL_get_fd(cookie));
 810         SSL_shutdown(cookie);
 811         SSL_free(cookie);
 812         return 0;
 813 }*/
 814 #endif  /* DO_SSL */
 815
 816 static struct ast_variable *parse_cookies(char *cookies)
 817 {
 818         char *cur;
 819         struct ast_variable *vars = NULL, *var;
 820
 821         while ((cur = strsep(&cookies, ";"))) {
 822                 char *name, *val;
 823
 824                 name = val = cur;
 825                 strsep(&val, "=");
 826
 827                 if (ast_strlen_zero(name) || ast_strlen_zero(val)) {
 828                         continue;
 829                 }
 830
 831                 name = ast_strip(name);
 832                 val = ast_strip_quoted(val, "\"", "\"");
 833
 834                 if (ast_strlen_zero(name) || ast_strlen_zero(val)) {
 835                         continue;
 836                 }
 837
 838                 ast_debug(1, "HTTP Cookie, Name: '%s'  Value: '%s'\n", name, val);
 839
 840                 var = ast_variable_new(name, val, __FILE__);
 841                 var->next = vars;
 842                 vars = var;
 843         }
 844
 845         return vars;
 846 }
 847
 848 /* get cookie from Request headers */
 849 struct ast_variable *ast_http_get_cookies(struct ast_variable *headers)
 850 {
 851         struct ast_variable *v, *cookies=NULL;
 852
 853         for (v = headers; v; v = v->next) {
 854                 if (!strncasecmp(v->name, "Cookie", 6)) {
 855                         char *tmp = ast_strdupa(v->value);
 856                         if (cookies) {
 857                                 ast_variables_destroy(cookies);
 858                         }
 859
 860                         cookies = parse_cookies(tmp);
 861                 }
 862         }
 863         return cookies;
 864 }
 865
 866
 867 static void *httpd_helper_thread(void *data)
 868 {
 869         char buf[4096];
 870         char header_line[4096];
 871         struct ast_tcptls_session_instance *ser = data;
 872         struct ast_variable *headers = NULL;
 873         struct ast_variable *tail = headers;
 874         char *uri, *method;
 875         enum ast_http_method http_method = AST_HTTP_UNKNOWN;
 876
 877         if (ast_atomic_fetchadd_int(&session_count, +1) >= session_limit) {
 878                 goto done;
 879         }
 880
 881         if (!fgets(buf, sizeof(buf), ser->f)) {
 882                 goto done;
 883         }
 884
 885         /* Get method */
 886         method = ast_skip_blanks(buf);
 887         uri = ast_skip_nonblanks(method);
 888         if (*uri) {
 889                 *uri++ = '\0';
 890         }
 891
 892         if (!strcasecmp(method,"GET")) {
 893                 http_method = AST_HTTP_GET;
 894         } else if (!strcasecmp(method,"POST")) {
 895                 http_method = AST_HTTP_POST;
 896         } else if (!strcasecmp(method,"HEAD")) {
 897                 http_method = AST_HTTP_HEAD;
 898         } else if (!strcasecmp(method,"PUT")) {
 899                 http_method = AST_HTTP_PUT;
 900         }
 901
 902         uri = ast_skip_blanks(uri);     /* Skip white space */
 903
 904         if (*uri) {                     /* terminate at the first blank */
 905                 char *c = ast_skip_nonblanks(uri);
 906
 907                 if (*c) {
 908                         *c = '\0';
 909                 }
 910         }
 911
 912         /* process "Request Headers" lines */
 913         while (fgets(header_line, sizeof(header_line), ser->f)) {
 914                 char *name, *value;
 915
 916                 /* Trim trailing characters */
 917                 ast_trim_blanks(header_line);
 918                 if (ast_strlen_zero(header_line)) {
 919                         break;
 920                 }
 921
 922                 value = header_line;
 923                 name = strsep(&value, ":");
 924                 if (!value) {
 925                         continue;
 926                 }
 927
 928                 value = ast_skip_blanks(value);
 929                 if (ast_strlen_zero(value) || ast_strlen_zero(name)) {
 930                         continue;
 931                 }
 932
 933                 ast_trim_blanks(name);
 934
 935                 if (!headers) {
 936                         headers = ast_variable_new(name, value, __FILE__);
 937                         tail = headers;
 938                 } else {
 939                         tail->next = ast_variable_new(name, value, __FILE__);
 940                         tail = tail->next;
 941                 }
 942         }
 943
 944         if (!*uri) {
 945                 ast_http_error(ser, 400, "Bad Request", "Invalid Request");
 946                 goto done;
 947         }
 948
 949         handle_uri(ser, uri, http_method, headers);
 950
 951 done:
 952         ast_atomic_fetchadd_int(&session_count, -1);
 953
 954         /* clean up all the header information */
 955         if (headers) {
 956                 ast_variables_destroy(headers);
 957         }
 958
 959         if (ser->f) {
 960                 fclose(ser->f);
 961         }
 962         ao2_ref(ser, -1);
 963         ser = NULL;
 964         return NULL;
 965 }
 966
 967 /*!
 968  * \brief Add a new URI redirect
 969  * The entries in the redirect list are sorted by length, just like the list
 970  * of URI handlers.
 971  */
 972 static void add_redirect(const char *value)
 973 {
 974         char *target, *dest;
 975         struct http_uri_redirect *redirect, *cur;
 976         unsigned int target_len;
 977         unsigned int total_len;
 978
 979         dest = ast_strdupa(value);
 980         dest = ast_skip_blanks(dest);
 981         target = strsep(&dest, " ");
 982         target = ast_skip_blanks(target);
 983         target = strsep(&target, " "); /* trim trailing whitespace */
 984
 985         if (!dest) {
 986                 ast_log(LOG_WARNING, "Invalid redirect '%s'\n", value);
 987                 return;
 988         }
 989
 990         target_len = strlen(target) + 1;
 991         total_len = sizeof(*redirect) + target_len + strlen(dest) + 1;
 992
 993         if (!(redirect = ast_calloc(1, total_len))) {
 994                 return;
 995         }
 996         redirect->dest = redirect->target + target_len;
 997         strcpy(redirect->target, target);
 998         strcpy(redirect->dest, dest);
 999
1000         AST_RWLIST_WRLOCK(&uri_redirects);
1001
1002         target_len--; /* So we can compare directly with strlen() */
1003         if (AST_RWLIST_EMPTY(&uri_redirects)
1004                 || strlen(AST_RWLIST_FIRST(&uri_redirects)->target) <= target_len ) {
1005                 AST_RWLIST_INSERT_HEAD(&uri_redirects, redirect, entry);
1006                 AST_RWLIST_UNLOCK(&uri_redirects);
1007
1008                 return;
1009         }
1010
1011         AST_RWLIST_TRAVERSE(&uri_redirects, cur, entry) {
1012                 if (AST_RWLIST_NEXT(cur, entry)
1013                         && strlen(AST_RWLIST_NEXT(cur, entry)->target) <= target_len ) {
1014                         AST_RWLIST_INSERT_AFTER(&uri_redirects, cur, redirect, entry);
1015                         AST_RWLIST_UNLOCK(&uri_redirects);
1016                         return;
1017                 }
1018         }
1019
1020         AST_RWLIST_INSERT_TAIL(&uri_redirects, redirect, entry);
1021
1022         AST_RWLIST_UNLOCK(&uri_redirects);
1023 }
1024
1025 static int __ast_http_load(int reload)
1026 {
1027         struct ast_config *cfg;
1028         struct ast_variable *v;
1029         int enabled=0;
1030         int newenablestatic=0;
1031         char newprefix[MAX_PREFIX] = "";
1032         struct http_uri_redirect *redirect;
1033         struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
1034         uint32_t bindport = DEFAULT_PORT;
1035         struct ast_sockaddr *addrs = NULL;
1036         int num_addrs = 0;
1037         int http_tls_was_enabled = 0;
1038
1039         cfg = ast_config_load2("http.conf", "http", config_flags);
1040         if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEUNCHANGED || cfg == CONFIG_STATUS_FILEINVALID) {
1041                 return 0;
1042         }
1043
1044         http_tls_was_enabled = (reload && http_tls_cfg.enabled);
1045
1046         http_tls_cfg.enabled = 0;
1047         if (http_tls_cfg.certfile) {
1048                 ast_free(http_tls_cfg.certfile);
1049         }
1050         http_tls_cfg.certfile = ast_strdup(AST_CERTFILE);
1051
1052         if (http_tls_cfg.pvtfile) {
1053                 ast_free(http_tls_cfg.pvtfile);
1054         }
1055         http_tls_cfg.pvtfile = ast_strdup("");
1056
1057         if (http_tls_cfg.cipher) {
1058                 ast_free(http_tls_cfg.cipher);
1059         }
1060         http_tls_cfg.cipher = ast_strdup("");
1061
1062         AST_RWLIST_WRLOCK(&uri_redirects);
1063         while ((redirect = AST_RWLIST_REMOVE_HEAD(&uri_redirects, entry))) {
1064                 ast_free(redirect);
1065         }
1066         AST_RWLIST_UNLOCK(&uri_redirects);
1067
1068         ast_sockaddr_setnull(&https_desc.local_address);
1069
1070         if (cfg) {
1071                 v = ast_variable_browse(cfg, "general");
1072                 for (; v; v = v->next) {
1073
1074                         /* read tls config options while preventing unsupported options from being set */
1075                         if (strcasecmp(v->name, "tlscafile")
1076                                 && strcasecmp(v->name, "tlscapath")
1077                                 && strcasecmp(v->name, "tlscadir")
1078                                 && strcasecmp(v->name, "tlsverifyclient")
1079                                 && strcasecmp(v->name, "tlsdontverifyserver")
1080                                 && strcasecmp(v->name, "tlsclientmethod")
1081                                 && strcasecmp(v->name, "sslclientmethod")
1082                                 && strcasecmp(v->name, "tlscipher")
1083                                 && strcasecmp(v->name, "sslcipher")
1084                                 && !ast_tls_read_conf(&http_tls_cfg, &https_desc, v->name, v->value)) {
1085                                 continue;
1086                         }
1087
1088                         if (!strcasecmp(v->name, "enabled")) {
1089                                 enabled = ast_true(v->value);
1090                         } else if (!strcasecmp(v->name, "enablestatic")) {
1091                                 newenablestatic = ast_true(v->value);
1092                         } else if (!strcasecmp(v->name, "bindport")) {
1093                                 if (ast_parse_arg(v->value, PARSE_UINT32 | PARSE_IN_RANGE | PARSE_DEFAULT, &bindport, DEFAULT_PORT, 0, 65535)) {
1094                                         ast_log(LOG_WARNING, "Invalid port %s specified. Using default port %"PRId32, v->value, DEFAULT_PORT);
1095                                 }
1096                         } else if (!strcasecmp(v->name, "bindaddr")) {
1097                                 if (!(num_addrs = ast_sockaddr_resolve(&addrs, v->value, 0, AST_AF_UNSPEC))) {
1098                                         ast_log(LOG_WARNING, "Invalid bind address %s\n", v->value);
1099                                 }
1100                         } else if (!strcasecmp(v->name, "prefix")) {
1101                                 if (!ast_strlen_zero(v->value)) {
1102                                         newprefix[0] = '/';
1103                                         ast_copy_string(newprefix + 1, v->value, sizeof(newprefix) - 1);
1104                                 } else {
1105                                         newprefix[0] = '\0';
1106                                 }
1107                         } else if (!strcasecmp(v->name, "redirect")) {
1108                                 add_redirect(v->value);
1109                         } else if (!strcasecmp(v->name, "sessionlimit")) {
1110                                 if (ast_parse_arg(v->value, PARSE_INT32|PARSE_DEFAULT|PARSE_IN_RANGE,
1111                                                         &session_limit, DEFAULT_SESSION_LIMIT, 1, INT_MAX)) {
1112                                         ast_log(LOG_WARNING, "Invalid %s '%s' at line %d of http.conf\n",
1113                                                         v->name, v->value, v->lineno);
1114                                 }
1115                         } else {
1116                                 ast_log(LOG_WARNING, "Ignoring unknown option '%s' in http.conf\n", v->name);
1117                         }
1118                 }
1119
1120                 ast_config_destroy(cfg);
1121         }
1122
1123         if (strcmp(prefix, newprefix)) {
1124                 ast_copy_string(prefix, newprefix, sizeof(prefix));
1125         }
1126         enablestatic = newenablestatic;
1127
1128         if (num_addrs && enabled) {
1129                 int i;
1130                 for (i = 0; i < num_addrs; ++i) {
1131                         ast_sockaddr_copy(&http_desc.local_address, &addrs[i]);
1132                         if (!ast_sockaddr_port(&http_desc.local_address)) {
1133                                 ast_sockaddr_set_port(&http_desc.local_address, bindport);
1134                         }
1135                         ast_tcptls_server_start(&http_desc);
1136                         if (http_desc.accept_fd == -1) {
1137                                 ast_log(LOG_WARNING, "Failed to start HTTP server for address %s\n", ast_sockaddr_stringify(&addrs[i]));
1138                                 ast_sockaddr_setnull(&http_desc.local_address);
1139                         } else {
1140                                 ast_verb(1, "Bound HTTP server to address %s\n", ast_sockaddr_stringify(&addrs[i]));
1141                                 break;
1142                         }
1143                 }
1144                 /* When no specific TLS bindaddr is specified, we just use
1145                  * the non-TLS bindaddress here.
1146                  */
1147                 if (ast_sockaddr_isnull(&https_desc.local_address) && http_desc.accept_fd != -1) {
1148                         ast_sockaddr_copy(&https_desc.local_address, &https_desc.local_address);
1149                         /* Of course, we can't use the same port though.
1150                          * Since no bind address was specified, we just use the
1151                          * default TLS port
1152                          */
1153                         ast_sockaddr_set_port(&https_desc.local_address, DEFAULT_TLS_PORT);
1154                 }
1155         }
1156         if (http_tls_was_enabled && !http_tls_cfg.enabled) {
1157                 ast_tcptls_server_stop(&https_desc);
1158         } else if (http_tls_cfg.enabled && !ast_sockaddr_isnull(&https_desc.local_address)) {
1159                 /* We can get here either because a TLS-specific address was specified
1160                  * or because we copied the non-TLS address here. In the case where
1161                  * we read an explicit address from the config, there may have been
1162                  * no port specified, so we'll just use the default TLS port.
1163                  */
1164                 if (!ast_sockaddr_port(&https_desc.local_address)) {
1165                         ast_sockaddr_set_port(&https_desc.local_address, DEFAULT_TLS_PORT);
1166                 }
1167                 if (ast_ssl_setup(https_desc.tls_cfg)) {
1168                         ast_tcptls_server_start(&https_desc);
1169                 }
1170         }
1171
1172         return 0;
1173 }
1174
1175 static char *handle_show_http(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1176 {
1177         struct ast_http_uri *urih;
1178         struct http_uri_redirect *redirect;
1179
1180         switch (cmd) {
1181         case CLI_INIT:
1182                 e->command = "http show status";
1183                 e->usage =
1184                         "Usage: http show status\n"
1185                         "       Lists status of internal HTTP engine\n";
1186                 return NULL;
1187         case CLI_GENERATE:
1188                 return NULL;
1189         }
1190
1191         if (a->argc != 3) {
1192                 return CLI_SHOWUSAGE;
1193         }
1194         ast_cli(a->fd, "HTTP Server Status:\n");
1195         ast_cli(a->fd, "Prefix: %s\n", prefix);
1196         if (ast_sockaddr_isnull(&http_desc.old_address)) {
1197                 ast_cli(a->fd, "Server Disabled\n\n");
1198         } else {
1199                 ast_cli(a->fd, "Server Enabled and Bound to %s\n\n",
1200                         ast_sockaddr_stringify(&http_desc.old_address));
1201                 if (http_tls_cfg.enabled) {
1202                         ast_cli(a->fd, "HTTPS Server Enabled and Bound to %s\n\n",
1203                                 ast_sockaddr_stringify(&https_desc.old_address));
1204                 }
1205         }
1206
1207         ast_cli(a->fd, "Enabled URI's:\n");
1208         AST_RWLIST_RDLOCK(&uris);
1209         if (AST_RWLIST_EMPTY(&uris)) {
1210                 ast_cli(a->fd, "None.\n");
1211         } else {
1212                 AST_RWLIST_TRAVERSE(&uris, urih, entry)
1213                         ast_cli(a->fd, "%s/%s%s => %s\n", prefix, urih->uri, (urih->has_subtree ? "/..." : "" ), urih->description);
1214         }
1215         AST_RWLIST_UNLOCK(&uris);
1216
1217         ast_cli(a->fd, "\nEnabled Redirects:\n");
1218         AST_RWLIST_RDLOCK(&uri_redirects);
1219         AST_RWLIST_TRAVERSE(&uri_redirects, redirect, entry)
1220                 ast_cli(a->fd, "  %s => %s\n", redirect->target, redirect->dest);
1221         if (AST_RWLIST_EMPTY(&uri_redirects)) {
1222                 ast_cli(a->fd, "  None.\n");
1223         }
1224         AST_RWLIST_UNLOCK(&uri_redirects);
1225
1226         return CLI_SUCCESS;
1227 }
1228
1229 int ast_http_reload(void)
1230 {
1231         return __ast_http_load(1);
1232 }
1233
1234 static struct ast_cli_entry cli_http[] = {
1235         AST_CLI_DEFINE(handle_show_http, "Display HTTP server status"),
1236 };
1237
1238 static void http_shutdown(void)
1239 {
1240         ast_cli_unregister_multiple(cli_http, ARRAY_LEN(cli_http));
1241 }
1242
1243 int ast_http_init(void)
1244 {
1245         ast_http_uri_link(&statusuri);
1246         ast_http_uri_link(&staticuri);
1247         ast_cli_register_multiple(cli_http, ARRAY_LEN(cli_http));
1248         ast_register_atexit(http_shutdown);
1249
1250         return __ast_http_load(0);
1251 }