prosody
de3edab7551d
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 2204:de3edab7551d

Provide SASL PLAIN mechanism only if TLS is active.
author Tobias Markmann <tm@ayena.de>
date Wed, 18 Nov 2009 23:26:35 +0100
parent 2193:8fbbdb11a520
child 2207:7ef74b2be8f8
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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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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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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 nodeprep = require "util.encodings".stringprep.nodeprep;
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17 local datamanager_load = require "util.datamanager".load;
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18 local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
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19 local usermanager_get_supported_methods = require "core.usermanager".get_supported_methods;
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20 local usermanager_user_exists = require "core.usermanager".user_exists;
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21 local usermanager_get_password = require "core.usermanager".get_password;
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22 local t_concat, t_insert = table.concat, table.insert;
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23 local tostring = tostring;
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24 local jid_split = require "util.jid".split
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25 local md5 = require "util.hashes".md5;
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26 local config = require "core.configmanager";
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27
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28 local secure_auth_only = config.get(module:get_host(), "core", "c2s_require_encryption") or config.get(module:get_host(), "core", "require_encryption");
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29
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30 local log = module._log;
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31
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32 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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33 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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34 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
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36 local new_sasl = require "util.sasl".new;
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37
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38 default_authentication_profile = {
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39 plain = function(username, realm)
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40 local prepped_username = nodeprep(username);
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41 if not prepped_username then
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42 log("debug", "NODEprep failed on username: %s", username);
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43 return "", nil;
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44 end
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45 local password = usermanager_get_password(prepped_username, realm);
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46 if not password then
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47 return "", nil;
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48 end
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49 return password, true;
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50 end
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51 };
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52
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53 anonymous_authentication_profile = {
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54 anonymous = function(username, realm)
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55 return true; -- for normal usage you should always return true here
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56 end
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57 }
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58
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59 local function build_reply(status, ret, err_msg)
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60 local reply = st.stanza(status, {xmlns = xmlns_sasl});
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61 if status == "challenge" then
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62 log("debug", "%s", ret or "");
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63 reply:text(base64.encode(ret or ""));
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64 elseif status == "failure" then
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65 reply:tag(ret):up();
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66 if err_msg then reply:tag("text"):text(err_msg); end
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67 elseif status == "success" then
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68 log("debug", "%s", ret or "");
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69 reply:text(base64.encode(ret or ""));
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70 else
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71 module:log("error", "Unknown sasl status: %s", status);
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72 end
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73 return reply;
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74 end
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75
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76 local function handle_status(session, status)
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77 if status == "failure" then
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78 session.sasl_handler = nil;
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79 elseif status == "success" then
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80 local username = nodeprep(session.sasl_handler.username);
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81 if not username then -- TODO move this to sessionmanager
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82 module:log("warn", "SASL succeeded but we didn't get a username!");
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83 session.sasl_handler = nil;
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84 session:reset_stream();
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85 return;
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86 end
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87 sm_make_authenticated(session, session.sasl_handler.username);
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88 session.sasl_handler = nil;
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89 session:reset_stream();
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90 end
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91 end
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92
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93 local function sasl_handler(session, stanza)
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94 if stanza.name == "auth" then
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95 -- FIXME ignoring duplicates because ejabberd does
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96 if config.get(session.host or "*", "core", "anonymous_login") then
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97 if stanza.attr.mechanism ~= "ANONYMOUS" then
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98 return session.send(build_reply("failure", "invalid-mechanism"));
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99 end
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100 elseif stanza.attr.mechanism == "ANONYMOUS" then
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101 return session.send(build_reply("failure", "mechanism-too-weak"));
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102 end
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103 local valid_mechanism = session.sasl_handler:select(stanza.attr.mechanism);
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104 if not valid_mechanism then
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105 return session.send(build_reply("failure", "invalid-mechanism"));
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106 end
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107 elseif not session.sasl_handler then
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108 return; -- FIXME ignoring out of order stanzas because ejabberd does
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109 end
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110 local text = stanza[1];
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111 if text then
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112 text = base64.decode(text);
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113 log("debug", "%s", text);
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114 if not text then
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115 session.sasl_handler = nil;
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116 session.send(build_reply("failure", "incorrect-encoding"));
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117 return;
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118 end
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119 end
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120 local status, ret, err_msg = session.sasl_handler:process(text);
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121 handle_status(session, status);
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122 local s = build_reply(status, ret, err_msg);
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123 log("debug", "sasl reply: %s", tostring(s));
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124 session.send(s);
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125 end
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126
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127 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler);
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128 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler);
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129 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler);
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130
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131 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
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132 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
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133 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
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134 module:add_event_hook("stream-features",
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135 function (session, features)
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136 if not session.username then
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137 if secure_auth_only and not session.secure then
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138 return;
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139 end
2193
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140 if config.get(session.host or "*", "core", "anonymous_login") then
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141 session.sasl_handler = new_sasl(session.host, anonymous_authentication_profile);
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142 else
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143 session.sasl_handler = new_sasl(session.host, default_authentication_profile);
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144 if not session.secure then
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145 session.sasl_handler:forbidden({"PLAIN"});
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146 end
2193
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147 end
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148 features:tag("mechanisms", mechanisms_attr);
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149 for k, v in pairs(session.sasl_handler:mechanisms()) do
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150 features:tag("mechanism"):text(v):up();
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151 end
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152 features:up();
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153 else
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154 features:tag("bind", bind_attr):tag("required"):up():up();
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155 features:tag("session", xmpp_session_attr):tag("optional"):up():up();
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156 end
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157 end);
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158
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159 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind",
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160 function (session, stanza)
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161 log("debug", "Client requesting a resource bind");
46
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162 local resource;
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163 if stanza.attr.type == "set" then
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164 local bind = stanza.tags[1];
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165 if bind and bind.attr.xmlns == xmlns_bind then
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166 resource = bind:child_with_name("resource");
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167 if resource then
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diff changeset
168 resource = resource[1];
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169 end
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diff changeset
170 end
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171 end
304
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diff changeset
172 local success, err_type, err, err_msg = sm_bind_resource(session, resource);
46
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173 if not success then
304
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diff changeset
174 session.send(st.error_reply(stanza, err_type, err, err_msg));
46
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175 else
304
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diff changeset
176 session.send(st.reply(stanza)
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177 :tag("bind", { xmlns = xmlns_bind})
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178 :tag("jid"):text(session.full_jid));
46
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diff changeset
179 end
d6b3f9dbb624 Resource binding, XMPP sessions (whatever they're for...)
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180 end);
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181
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182 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session",
46
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diff changeset
183 function (session, stanza)
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184 log("debug", "Client requesting a session");
313
a273f3a7b8f8 Fixed mod_saslauth to use session.send for sending stanzas
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diff changeset
185 session.send(st.reply(stanza));
46
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diff changeset
186 end);