prosody
5305a665bdd4
util/xmppstream.lua

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util/xmppstream.lua @ 4275:5305a665bdd4

util.xmppstream: Reject XML comments, processing instructions and (if supported by LuaExpat) DTDs. If not supported, log a warning.
author Matthew Wild <mwild1@gmail.com>
date Wed, 01 Jun 2011 23:02:10 +0100
parent 4012:a4f8e226bc4a
child 4278:67ce42aa7419
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rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10 local lxp = require "lxp";
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11 local st = require "util.stanza";
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13 local tostring = tostring;
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14 local t_insert = table.insert;
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15 local t_concat = table.concat;
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16
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17 local default_log = require "util.logger".init("xmppstream");
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18
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19 -- COMPAT: w/LuaExpat 1.1.0
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20 local lxp_supports_doctype = pcall(lxp.new, { StartDoctypeDecl = false });
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22 if not lxp_supports_doctype then
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23 default_log("warn", "The version of LuaExpat on your system leaves Prosody "
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24 .."vulnerable to denial-of-service attacks. You should upgrade to "
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25 .."LuaExpat 1.1.1 or higher as soon as possible. See "
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26 .."http://prosody.im/doc/depends#luaexpat for more information.");
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27 end
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28
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29 local error = error;
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31 module "xmppstream"
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32
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33 local new_parser = lxp.new;
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34
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35 local ns_prefixes = {
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36 ["http://www.w3.org/XML/1998/namespace"] = "xml";
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37 };
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39 local xmlns_streams = "http://etherx.jabber.org/streams";
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40
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41 local ns_separator = "\1";
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42 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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44 _M.ns_separator = ns_separator;
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45 _M.ns_pattern = ns_pattern;
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47 function new_sax_handlers(session, stream_callbacks)
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48 local xml_handlers = {};
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49
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50 local log = session.log or default_log;
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51
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52 local cb_streamopened = stream_callbacks.streamopened;
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53 local cb_streamclosed = stream_callbacks.streamclosed;
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54 local cb_error = stream_callbacks.error or function(session, e) error("XML stream error: "..tostring(e)); end;
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55 local cb_handlestanza = stream_callbacks.handlestanza;
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56
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57 local stream_ns = stream_callbacks.stream_ns or xmlns_streams;
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58 local stream_tag = stream_callbacks.stream_tag or "stream";
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59 if stream_ns ~= "" then
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60 stream_tag = stream_ns..ns_separator..stream_tag;
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61 end
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62 local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error");
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63
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64 local stream_default_ns = stream_callbacks.default_ns;
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65
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66 local chardata, stanza = {};
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67 local non_streamns_depth = 0;
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68 function xml_handlers:StartElement(tagname, attr)
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69 if stanza and #chardata > 0 then
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70 -- We have some character data in the buffer
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71 stanza:text(t_concat(chardata));
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72 chardata = {};
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73 end
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74 local curr_ns,name = tagname:match(ns_pattern);
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75 if name == "" then
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76 curr_ns, name = "", curr_ns;
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77 end
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78
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79 if curr_ns ~= stream_default_ns or non_streamns_depth > 0 then
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80 attr.xmlns = curr_ns;
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81 non_streamns_depth = non_streamns_depth + 1;
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82 end
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83
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84 -- FIXME !!!!!
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85 for i=1,#attr do
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86 local k = attr[i];
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87 attr[i] = nil;
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88 local ns, nm = k:match(ns_pattern);
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89 if nm ~= "" then
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90 ns = ns_prefixes[ns];
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91 if ns then
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92 attr[ns..":"..nm] = attr[k];
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93 attr[k] = nil;
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94 end
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95 end
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96 end
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97
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98 if not stanza then --if we are not currently inside a stanza
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99 if session.notopen then
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100 if tagname == stream_tag then
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101 non_streamns_depth = 0;
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102 if cb_streamopened then
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103 cb_streamopened(session, attr);
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104 end
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105 else
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106 -- Garbage before stream?
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107 cb_error(session, "no-stream");
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108 end
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109 return;
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110 end
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111 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
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112 cb_error(session, "invalid-top-level-element");
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113 end
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114
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115 stanza = st.stanza(name, attr);
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116 else -- we are inside a stanza, so add a tag
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117 stanza:tag(name, attr);
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118 end
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119 end
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120 function xml_handlers:CharacterData(data)
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121 if stanza then
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122 t_insert(chardata, data);
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123 end
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124 end
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125 function xml_handlers:EndElement(tagname)
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126 if non_streamns_depth > 0 then
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127 non_streamns_depth = non_streamns_depth - 1;
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128 end
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129 if stanza then
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130 if #chardata > 0 then
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131 -- We have some character data in the buffer
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132 stanza:text(t_concat(chardata));
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133 chardata = {};
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134 end
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135 -- Complete stanza
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136 local last_add = stanza.last_add;
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137 if not last_add or #last_add == 0 then
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138 if tagname ~= stream_error_tag then
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139 cb_handlestanza(session, stanza);
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140 else
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141 cb_error(session, "stream-error", stanza);
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142 end
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143 stanza = nil;
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144 else
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145 stanza:up();
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146 end
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147 else
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148 if tagname == stream_tag then
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149 if cb_streamclosed then
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150 cb_streamclosed(session);
148
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151 end
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152 else
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153 local curr_ns,name = tagname:match(ns_pattern);
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154 if name == "" then
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155 curr_ns, name = "", curr_ns;
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156 end
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157 cb_error(session, "parse-error", "unexpected-element-close", name);
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158 end
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159 stanza, chardata = nil, {};
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160 end
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161 end
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162
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163 local function restricted_handler()
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164 cb_error(session, "parse-error", "restricted-xml", "Restricted XML, see RFC 6120 section 11.1.");
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165 end
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166
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167 if lxp_supports_doctype then
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168 xml_handlers.StartDoctypeDecl = restricted_handler;
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169 end
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170 xml_handlers.Comment = restricted_handler;
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171 xml_handlers.StartCdataSection = restricted_handler;
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172 xml_handlers.ProcessingInstruction = restricted_handler;
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173
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174 local function reset()
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175 stanza, chardata = nil, {};
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176 end
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177
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178 local function set_session(stream, new_session)
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179 session = new_session;
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180 log = new_session.log or default_log;
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181 end
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182
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183 return xml_handlers, { reset = reset, set_session = set_session };
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184 end
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185
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186 function new(session, stream_callbacks)
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187 local handlers, meta = new_sax_handlers(session, stream_callbacks);
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188 local parser = new_parser(handlers, ns_separator);
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189 local parse = parser.parse;
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190
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191 return {
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192 reset = function ()
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193 parser = new_parser(handlers, ns_separator);
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194 parse = parser.parse;
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195 meta.reset();
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196 end,
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197 feed = function (self, data)
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198 return parse(parser, data);
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199 end,
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200 set_session = meta.set_session;
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201 };
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202 end
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203
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204 return _M;