Discourse Detection (HTTP)

# SPDX-FileCopyrightText: 2018 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.108454");
  script_version("2025-04-15T05:54:49+0000");
  script_tag(name:"cvss_base", value:"0.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:N");
  script_tag(name:"last_modification", value:"2025-04-15 05:54:49 +0000 (Tue, 15 Apr 2025)");
  script_tag(name:"creation_date", value:"2018-08-04 23:29:30 +0200 (Sat, 04 Aug 2018)");
  script_name("Discourse Detection (HTTP)");
  script_category(ACT_GATHER_INFO);
  script_family("Product detection");
  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_dependencies("find_service.nasl", "no404.nasl", "webmirror.nasl",
                      "DDI_Directory_Scanner.nasl", "global_settings.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_xref(name:"URL", value:"https://www.discourse.org/");

  script_tag(name:"summary", value:"HTTP based detection of Discourse.");

  script_tag(name:"qod_type", value:"remote_banner");

  exit(0);
}

include("http_func.inc");
include("http_keepalive.inc");
include("port_service_func.inc");
include("list_array_func.inc");
include("host_details.inc");

port = http_get_port( default:80 );

foreach dir( make_list_unique( "/", "/forum", "/forums", "/community", http_cgi_dirs( port:port ) ) ) {

  install = dir;
  if( dir == "/" )
    dir = "";

  buf = http_get_cache( item:dir + "/", port:port );
  buf2 = http_get_cache( item:dir + "/login", port:port );

  if( ( buf =~ "^HTTP/1\.[01] 200" &&
         ( '<meta name="discourse_theme_key"' >< buf ||
           '<meta name="discourse_theme_id"' >< buf ||
           '<meta name="discourse_current_homepage"' >< buf ||
           '<meta name="generator" content="Discourse' >< buf ||
           '<p>Powered by <a href="https://www.discourse.org">Discourse</a>' >< buf ||
           "<script>Discourse._registerPluginCode" >< buf ||
           "Discourse.start();" >< buf ) ) ||
      ( buf =~ "^HTTP/1\.[01] 500" && "<title>Oops - Error 500</title>" >< buf && "<h1>Oops</h1>" >< buf &&
        "<p>The software powering this discussion forum encountered an unexpected problem. We apologize for the inconvenience.</p>" >< buf ) ||
      ( buf2 =~ "^HTTP/1\.[01] 200" && '<meta name="generator" content="Discourse' >< buf2 ) ) {

    version = "unknown";
    cpe = "cpe:/a:discourse:discourse";

    set_kb_item( name:"discourse/detected", value:TRUE );
    set_kb_item( name:"discourse/http/detected", value:TRUE );

    # <meta name="generator" content="Discourse 3.5.0.beta3-dev - https://github.com/discourse/discourse version 6637eb2b64c83f881f2cd2fef3d5414ecda691f2">
    # <meta name="generator" content="Discourse 2.6.7 - https://github.com/discourse/discourse version f73cdbbd2f20460ea6330930f97cdce59fb984be">
    # <meta name="generator" content="Discourse 2.3.8 - https://github.com/discourse/discourse version d4e0eb63a2f599ec3a0f3aecc92b7d3600ef83c3">
    # <meta name="generator" content="Discourse 2.1.0.beta3 - https://github.com/discourse/discourse version fc3b904e1f64b7d53d7c8f11edd8ef434612f46e">
    # <meta name="generator" content="Discourse 2.0.0.beta9 - https://github.com/discourse/discourse version 7dd68e64d9248f760ded5162448cc8220f429cef">
    # <meta name="generator" content="Discourse 1.9.0.beta3 - https://github.com/discourse/discourse version f1a6449e4be0efe4a11fba75729d9499924b5602">
    # <meta name="generator" content="Discourse 1.5.3 - https://github.com/discourse/discourse version ba3f7936a80bf2b46788272b76ba06f73706ce11">
    # <meta name="generator" content="Discourse 1.3.0.beta1 - https://github.com/discourse/discourse version 3aa165d3b6c3f33ed044544121a392306a289a25">
    vers = eregmatch( string:buf, pattern:'content="Discourse ([0-9.]+)(\\.beta[0-9]+)?' );
    if( vers[1] && vers[2] ) {
      version = vers[1] + vers[2];
      cpe += ":" + version;
    } else if( vers[1] ) {
      version = vers[1];
      cpe += ":" + version;
    } else {
      vers = eregmatch( string:buf2, pattern:'content="Discourse ([0-9.]+)(\\.beta[0-9]+)?' );
      if( vers[1] && vers[2] ) {
        version = vers[1] + vers[2];
        cpe += ":" + version;
      } else if( vers[1] ) {
        version = vers[1];
        cpe += ":" + version;
      }
    }

    if( buf =~ "^HTTP/1\.[01] 500" )
      extra = "The Discourse software is currently in a not working state and is reporting an internal server error.";

    register_product( cpe:cpe, location:install, port:port, service:"www" );
    log_message( data:build_detection_report( app:"Discourse",
                                              version:version,
                                              install:install,
                                              cpe:cpe,
                                              concluded:vers[0],
                                              extra:extra ),
                 port:port );
    # nb: The 404 page "Oops! That page doesn't exist or is private." has the same generator meta name like all other pages
    # so exit here for the case where the web server is e.g. throwing a 200 for non existent pages.
    exit( 0 );
  }
}

exit( 0 );