prosody
edc066730d11
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 1585:edc066730d11

Switch to using a more generic credentials_callback/handler for SASL auth. Not all authentication mechanisms have the same requirements; it makes sense to provide them only with the information they require (and for them to depend on that) so that as many auth mechanisms as possible can be supported with a variety of credentials-storing schemes. This commit patches that together
author nick@lupine.me.uk
date Fri, 24 Jul 2009 01:34:25 +0100
parent 1584:ffe8a9296e04
child 1637:c1292624f991
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rev   line source
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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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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
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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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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 decoder then node, realm, password = decoder(node), decoder(realm), decoder(password); end
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81 return func, md5(node..":"..realm..":"..password);
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82 end
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83 end
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84
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85 local function sasl_handler(session, stanza)
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86 if stanza.name == "auth" then
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87 -- FIXME ignoring duplicates because ejabberd does
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88 if config.get(session.host or "*", "core", "anonymous_login") then
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89 if stanza.attr.mechanism ~= "ANONYMOUS" then
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90 return session.send(build_reply("failure", "invalid-mechanism"));
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91 end
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92 elseif stanza.attr.mechanism == "ANONYMOUS" then
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93 return session.send(build_reply("failure", "mechanism-too-weak"));
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94 end
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95 session.sasl_handler = new_sasl(stanza.attr.mechanism, session.host, credentials_callback);
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96 if not session.sasl_handler then
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97 return session.send(build_reply("failure", "invalid-mechanism"));
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98 end
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99 elseif not session.sasl_handler then
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100 return; -- FIXME ignoring out of order stanzas because ejabberd does
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101 end
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102 local text = stanza[1];
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103 if text then
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104 text = base64.decode(text);
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105 log("debug", "%s", text);
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106 if not text then
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107 session.sasl_handler = nil;
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108 session.send(build_reply("failure", "incorrect-encoding"));
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109 return;
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110 end
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111 end
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112 local status, ret, err_msg = session.sasl_handler:feed(text);
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113 handle_status(session, status);
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114 local s = build_reply(status, ret, err_msg);
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115 log("debug", "sasl reply: %s", tostring(s));
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116 session.send(s);
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117 end
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118
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119 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
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120 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
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121 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
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122
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123 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
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124 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
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125 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
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126 module:add_event_hook("stream-features",
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127 function (session, features)
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128 if not session.username then
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129 if secure_auth_only and not session.secure then
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130 return;
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131 end
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132 features:tag("mechanisms", mechanisms_attr);
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133 -- 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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134 if config.get(session.host or "*", "core", "anonymous_login") then
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135 features:tag("mechanism"):text("ANONYMOUS"):up();
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136 else
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137 mechanisms = usermanager_get_supported_methods(session.host or "*");
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138 for k, v in pairs(mechanisms) do
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139 features:tag("mechanism"):text(k):up();
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140 end
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141 end
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142 features:up();
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143 else
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144 features:tag("bind", bind_attr):tag("required"):up():up();
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145 features:tag("session", xmpp_session_attr):up();
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146 end
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147 end);
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148
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149 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
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150 function (session, stanza)
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151 log("debug", "Client requesting a resource bind");
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152 local resource;
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153 if stanza.attr.type == "set" then
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154 local bind = stanza.tags[1];
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155 if bind and bind.attr.xmlns == xmlns_bind then
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156 resource = bind:child_with_name("resource");
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157 if resource then
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158 resource = resource[1];
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159 end
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160 end
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161 end
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162 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
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163 if not success then
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164 session.send(st.error_reply(stanza, err_type, err, err_msg));
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165 else
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166 session.send(st.reply(stanza)
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167 :tag("bind", { xmlns = xmlns_bind})
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168 :tag("jid"):text(session.full_jid));
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169 end
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170 end);
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171
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172 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
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173 function (session, stanza)
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174 log("debug", "Client requesting a session");
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175 session.send(st.reply(stanza));
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176 end);