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