prosody
1d13f73af58e
util/xmppstream.lua

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util/xmppstream.lua @ 5901:1d13f73af58e

certmanager: Default to using the server's cipher preference order by default, as clients have been shown to commonly select weak and insecure ciphers even when they support stronger ones
author Matthew Wild <mwild1@gmail.com>
date Sat, 09 Nov 2013 17:50:19 +0000
parent 5311:86fe6e2fa5ae
child 5776:bd0ff8ae98a8
child 6042:1107d66d2ab2
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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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12 local stanza_mt = st.stanza_mt;
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14 local error = error;
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15 local tostring = tostring;
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16 local t_insert = table.insert;
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17 local t_concat = table.concat;
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18 local t_remove = table.remove;
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19 local setmetatable = setmetatable;
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20
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21 -- COMPAT: w/LuaExpat 1.1.0
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22 local lxp_supports_doctype = pcall(lxp.new, { StartDoctypeDecl = false });
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24 module "xmppstream"
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25
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26 local new_parser = lxp.new;
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27
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28 local xml_namespace = {
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29 ["http://www.w3.org/XML/1998/namespace\1lang"] = "xml:lang";
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30 ["http://www.w3.org/XML/1998/namespace\1space"] = "xml:space";
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31 ["http://www.w3.org/XML/1998/namespace\1base"] = "xml:base";
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32 ["http://www.w3.org/XML/1998/namespace\1id"] = "xml:id";
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33 };
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35 local xmlns_streams = "http://etherx.jabber.org/streams";
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36
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37 local ns_separator = "\1";
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38 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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40 _M.ns_separator = ns_separator;
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41 _M.ns_pattern = ns_pattern;
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42
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43 function new_sax_handlers(session, stream_callbacks)
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44 local xml_handlers = {};
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45
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46 local cb_streamopened = stream_callbacks.streamopened;
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47 local cb_streamclosed = stream_callbacks.streamclosed;
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48 local cb_error = stream_callbacks.error or function(session, e, stanza) error("XML stream error: "..tostring(e)..(stanza and ": "..tostring(stanza) or ""),2); end;
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49 local cb_handlestanza = stream_callbacks.handlestanza;
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50
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51 local stream_ns = stream_callbacks.stream_ns or xmlns_streams;
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52 local stream_tag = stream_callbacks.stream_tag or "stream";
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53 if stream_ns ~= "" then
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54 stream_tag = stream_ns..ns_separator..stream_tag;
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55 end
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56 local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error");
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57
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58 local stream_default_ns = stream_callbacks.default_ns;
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59
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60 local stack = {};
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61 local chardata, stanza = {};
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62 local non_streamns_depth = 0;
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63 function xml_handlers:StartElement(tagname, attr)
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64 if stanza and #chardata > 0 then
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65 -- We have some character data in the buffer
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66 t_insert(stanza, t_concat(chardata));
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67 chardata = {};
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68 end
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69 local curr_ns,name = tagname:match(ns_pattern);
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70 if name == "" then
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71 curr_ns, name = "", curr_ns;
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72 end
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73
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74 if curr_ns ~= stream_default_ns or non_streamns_depth > 0 then
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75 attr.xmlns = curr_ns;
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76 non_streamns_depth = non_streamns_depth + 1;
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77 end
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78
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79 for i=1,#attr do
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80 local k = attr[i];
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81 attr[i] = nil;
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82 local xmlk = xml_namespace[k];
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83 if xmlk then
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84 attr[xmlk] = attr[k];
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85 attr[k] = nil;
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86 end
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87 end
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88
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89 if not stanza then --if we are not currently inside a stanza
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90 if session.notopen then
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91 if tagname == stream_tag then
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92 non_streamns_depth = 0;
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93 if cb_streamopened then
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94 cb_streamopened(session, attr);
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95 end
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96 else
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97 -- Garbage before stream?
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98 cb_error(session, "no-stream");
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99 end
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100 return;
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101 end
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102 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
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103 cb_error(session, "invalid-top-level-element");
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104 end
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105
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106 stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt);
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107 else -- we are inside a stanza, so add a tag
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108 t_insert(stack, stanza);
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109 local oldstanza = stanza;
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110 stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt);
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111 t_insert(oldstanza, stanza);
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112 t_insert(oldstanza.tags, stanza);
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113 end
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114 end
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115 function xml_handlers:CharacterData(data)
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116 if stanza then
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117 t_insert(chardata, data);
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118 end
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119 end
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120 function xml_handlers:EndElement(tagname)
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121 if non_streamns_depth > 0 then
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122 non_streamns_depth = non_streamns_depth - 1;
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123 end
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124 if stanza then
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125 if #chardata > 0 then
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126 -- We have some character data in the buffer
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127 t_insert(stanza, t_concat(chardata));
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128 chardata = {};
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129 end
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130 -- Complete stanza
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131 if #stack == 0 then
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132 if tagname ~= stream_error_tag then
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133 cb_handlestanza(session, stanza);
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134 else
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135 cb_error(session, "stream-error", stanza);
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136 end
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137 stanza = nil;
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138 else
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139 stanza = t_remove(stack);
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140 end
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141 else
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142 if cb_streamclosed then
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143 cb_streamclosed(session);
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144 end
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145 end
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146 end
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147
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148 local function restricted_handler(parser)
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149 cb_error(session, "parse-error", "restricted-xml", "Restricted XML, see RFC 6120 section 11.1.");
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150 if not parser.stop or not parser:stop() then
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151 error("Failed to abort parsing");
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152 end
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153 end
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154
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155 if lxp_supports_doctype then
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156 xml_handlers.StartDoctypeDecl = restricted_handler;
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157 end
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158 xml_handlers.Comment = restricted_handler;
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159 xml_handlers.ProcessingInstruction = restricted_handler;
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160
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161 local function reset()
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162 stanza, chardata = nil, {};
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163 stack = {};
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164 end
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165
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166 local function set_session(stream, new_session)
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167 session = new_session;
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168 end
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169
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170 return xml_handlers, { reset = reset, set_session = set_session };
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171 end
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172
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173 function new(session, stream_callbacks)
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174 local handlers, meta = new_sax_handlers(session, stream_callbacks);
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175 local parser = new_parser(handlers, ns_separator);
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176 local parse = parser.parse;
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177
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178 return {
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179 reset = function ()
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180 parser = new_parser(handlers, ns_separator);
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181 parse = parser.parse;
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182 meta.reset();
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183 end,
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184 feed = function (self, data)
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185 return parse(parser, data);
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186 end,
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187 set_session = meta.set_session;
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188 };
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189 end
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190
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191 return _M;