Annotate

plugins/mod_saslauth.lua @ 1637:c1292624f991

mod_saslauth: Fix traceback on attempted login for non-existent users
author Matthew Wild <mwild1@gmail.com>
date Wed, 05 Aug 2009 16:31:56 +0100
parent 1585:edc066730d11
child 1638:6fd0c2f46b21
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 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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11 local st = require "util.stanza";
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12 local sm_bind_resource = require "core.sessionmanager".bind_resource;
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13 local sm_make_authenticated = require "core.sessionmanager".make_authenticated;
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14 local base64 = require "util.encodings".base64;
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15
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16 local datamanager_load = require "util.datamanager".load;
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17 local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
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18 local usermanager_get_supported_methods = require "core.usermanager".get_supported_methods;
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19 local usermanager_user_exists = require "core.usermanager".user_exists;
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20 local usermanager_get_password = require "core.usermanager".get_password;
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21 local t_concat, t_insert = table.concat, table.insert;
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22 local tostring = tostring;
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23 local jid_split = require "util.jid".split
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24 local md5 = require "util.hashes".md5;
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25 local config = require "core.configmanager";
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27 local secure_auth_only = config.get(module:get_host(), "core", "require_encryption");
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28
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29 local log = module._log;
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31 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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32 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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33 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
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34
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35 local new_sasl = require "util.sasl".new;
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36
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37 local function build_reply(status, ret, err_msg)
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38 local reply = st.stanza(status, {xmlns = xmlns_sasl});
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39 if status == "challenge" then
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40 log("debug", "%s", ret or "");
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41 reply:text(base64.encode(ret or ""));
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42 elseif status == "failure" then
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43 reply:tag(ret):up();
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44 if err_msg then reply:tag("text"):text(err_msg); end
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45 elseif status == "success" then
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46 log("debug", "%s", ret or "");
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47 reply:text(base64.encode(ret or ""));
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48 else
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49 module:log("error", "Unknown sasl status: %s", status);
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50 end
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51 return reply;
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52 end
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53
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54 local function handle_status(session, status)
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55 if status == "failure" then
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56 session.sasl_handler = nil;
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57 elseif status == "success" then
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58 if not session.sasl_handler.username then -- TODO move this to sessionmanager
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59 module:log("warn", "SASL succeeded but we didn't get a username!");
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60 session.sasl_handler = nil;
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61 session:reset_stream();
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62 return;
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63 end
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64 sm_make_authenticated(session, session.sasl_handler.username);
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65 session.sasl_handler = nil;
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66 session:reset_stream();
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67 end
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68 end
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69
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70 local function credentials_callback(mechanism, ...)
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71 if mechanism == "PLAIN" then
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72 local username, hostname, password = arg[1], arg[2], arg[3];
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73 local response = usermanager_validate_credentials(hostname, username, password, mechanism)
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74 if response == nil then return false
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75 else return response end
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76 elseif mechanism == "DIGEST-MD5" then
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77 function func(x) return x; end
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78 local node, domain, realm, decoder = arg[1], arg[2], arg[3], arg[4];
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79 local password = usermanager_get_password(node, domain)
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80 if password then
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81 if decoder then node, realm, password = decoder(node), decoder(realm), decoder(password); end
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82 return func, md5(node..":"..realm..":"..password);
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83 else
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84 return func, nil;
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85 end
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86 end
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87 end
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88
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89 local function sasl_handler(session, stanza)
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90 if stanza.name == "auth" then
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91 -- FIXME ignoring duplicates because ejabberd does
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92 if config.get(session.host or "*", "core", "anonymous_login") then
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93 if stanza.attr.mechanism ~= "ANONYMOUS" then
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94 return session.send(build_reply("failure", "invalid-mechanism"));
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95 end
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96 elseif stanza.attr.mechanism == "ANONYMOUS" then
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97 return session.send(build_reply("failure", "mechanism-too-weak"));
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98 end
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99 session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, credentials_callback);
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100 if not session.sasl_handler then
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101 return session.send(build_reply("failure", "invalid-mechanism"));
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102 end
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103 elseif not session.sasl_handler then
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104 return; -- FIXME ignoring out of order stanzas because ejabberd does
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105 end
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106 local text = stanza[1];
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107 if text then
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108 text = base64.decode(text);
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109 log("debug", "%s", text);
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110 if not text then
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111 session.sasl_handler = nil;
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112 session.send(build_reply("failure", "incorrect-encoding"));
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113 return;
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114 end
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115 end
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116 local status, ret, err_msg = session.sasl_handler:feed(text);
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117 handle_status(session, status);
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118 local s = build_reply(status, ret, err_msg);
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119 log("debug", "sasl reply: %s", tostring(s));
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120 session.send(s);
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121 end
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122
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123 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
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124 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
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125 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
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126
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127 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
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128 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
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129 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
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130 module:add_event_hook("stream-features",
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131 function (session, features)
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132 if not session.username then
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133 if secure_auth_only and not session.secure then
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134 return;
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135 end
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136 features:tag("mechanisms", mechanisms_attr);
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137 -- TODO: Provide PLAIN only if TLS is active, this is a SHOULD from the introduction of RFC 4616. This behavior could be overridden via configuration but will issuing a warning or so.
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138 if config.get(session.host or "*", "core", "anonymous_login") then
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139 features:tag("mechanism"):text("ANONYMOUS"):up();
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140 else
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141 mechanisms = usermanager_get_supported_methods(session.host or "*");
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142 for k, v in pairs(mechanisms) do
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143 features:tag("mechanism"):text(k):up();
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144 end
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145 end
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146 features:up();
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147 else
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148 features:tag("bind", bind_attr):tag("required"):up():up();
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149 features:tag("session", xmpp_session_attr):up();
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150 end
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151 end);
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152
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153 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
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154 function (session, stanza)
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155 log("debug", "Client requesting a resource bind");
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156 local resource;
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157 if stanza.attr.type == "set" then
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158 local bind = stanza.tags[1];
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159 if bind and bind.attr.xmlns == xmlns_bind then
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160 resource = bind:child_with_name("resource");
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161 if resource then
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162 resource = resource[1];
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163 end
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164 end
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165 end
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166 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
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167 if not success then
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168 session.send(st.error_reply(stanza, err_type, err, err_msg));
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169 else
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170 session.send(st.reply(stanza)
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171 :tag("bind", { xmlns = xmlns_bind})
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172 :tag("jid"):text(session.full_jid));
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173 end
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174 end);
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175
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176 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
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177 function (session, stanza)
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178 log("debug", "Client requesting a session");
313
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179 session.send(st.reply(stanza));
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180 end);