prosody
d343a76431cf
plugins/mod_saslauth.lua

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plugins/mod_saslauth.lua @ 4051:d343a76431cf

mod_saslauth: Remove special handling for SASL ANONYMOUS, and let mod_auth_anonymous handle it.
author Waqas Hussain <waqas20@gmail.com>
date Tue, 28 Dec 2010 05:28:15 +0500
parent 4049:fe6f4a255fd8
child 4078:05a58497a903
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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
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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 usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler;
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18 local tostring = tostring;
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19
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20 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
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21 local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth")
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22
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23 local log = module._log;
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24
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25 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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26 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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27 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas';
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28
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29 local function build_reply(status, ret, err_msg)
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30 local reply = st.stanza(status, {xmlns = xmlns_sasl});
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31 if status == "challenge" then
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32 --log("debug", "CHALLENGE: %s", ret or "");
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33 reply:text(base64.encode(ret or ""));
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34 elseif status == "failure" then
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35 reply:tag(ret):up();
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36 if err_msg then reply:tag("text"):text(err_msg); end
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37 elseif status == "success" then
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38 --log("debug", "SUCCESS: %s", ret or "");
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39 reply:text(base64.encode(ret or ""));
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40 else
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41 module:log("error", "Unknown sasl status: %s", status);
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42 end
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43 return reply;
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44 end
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45
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46 local function handle_status(session, status, ret, err_msg)
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47 if status == "failure" then
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48 session.sasl_handler = session.sasl_handler:clean_clone();
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49 elseif status == "success" then
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50 local username = nodeprep(session.sasl_handler.username);
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51
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52 local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
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53 if ok then
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54 session.sasl_handler = nil;
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55 session:reset_stream();
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56 else
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57 module:log("warn", "SASL succeeded but username was invalid");
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58 session.sasl_handler = session.sasl_handler:clean_clone();
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59 return "failure", "not-authorized", "User authenticated successfully, but username was invalid";
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60 end
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61 end
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62 return status, ret, err_msg;
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63 end
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64
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65 local function sasl_process_cdata(session, stanza)
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66 local text = stanza[1];
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67 if text then
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68 text = base64.decode(text);
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69 --log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " "));
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70 if not text then
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71 session.sasl_handler = nil;
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72 session.send(build_reply("failure", "incorrect-encoding"));
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73 return true;
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74 end
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75 end
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76 local status, ret, err_msg = session.sasl_handler:process(text);
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77 status, ret, err_msg = handle_status(session, status, ret, err_msg);
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78 local s = build_reply(status, ret, err_msg);
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79 log("debug", "sasl reply: %s", tostring(s));
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80 session.send(s);
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81 return true;
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82 end
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83
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84 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function(event)
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85 local session, stanza = event.origin, event.stanza;
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86 if session.type ~= "c2s_unauthed" then return; end
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87
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88 if session.sasl_handler and session.sasl_handler.selected then
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89 session.sasl_handler = nil; -- allow starting a new SASL negotiation before completing an old one
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90 end
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91 if not session.sasl_handler then
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92 session.sasl_handler = usermanager_get_sasl_handler(module.host);
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93 end
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94 local mechanism = stanza.attr.mechanism;
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95 if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then
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96 session.send(build_reply("failure", "encryption-required"));
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97 return true;
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98 end
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99 local valid_mechanism = session.sasl_handler:select(mechanism);
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100 if not valid_mechanism then
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101 session.send(build_reply("failure", "invalid-mechanism"));
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102 return true;
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103 end
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104 return sasl_process_cdata(session, stanza);
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105 end);
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106 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:response", function(event)
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107 local session = event.origin;
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108 if not(session.sasl_handler and session.sasl_handler.selected) then
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109 session.send(build_reply("failure", "not-authorized", "Out of order SASL element"));
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110 return true;
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111 end
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112 return sasl_process_cdata(session, event.stanza);
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113 end);
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114 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:abort", function(event)
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115 local session = event.origin;
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116 session.sasl_handler = nil;
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117 session.send(build_reply("failure", "aborted"));
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118 return true;
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119 end);
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120
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121 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
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122 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
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123 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
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124 module:hook("stream-features", function(event)
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125 local origin, features = event.origin, event.features;
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126 if not origin.username then
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127 if secure_auth_only and not origin.secure then
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128 return;
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129 end
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130 origin.sasl_handler = usermanager_get_sasl_handler(module.host);
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131 features:tag("mechanisms", mechanisms_attr);
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132 for mechanism in pairs(origin.sasl_handler:mechanisms()) do
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133 if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then
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134 features:tag("mechanism"):text(mechanism):up();
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135 end
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136 end
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137 features:up();
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138 else
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139 features:tag("bind", bind_attr):tag("required"):up():up();
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140 features:tag("session", xmpp_session_attr):tag("optional"):up():up();
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141 end
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142 end);
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143
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144 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event)
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145 local origin, stanza = event.origin, event.stanza;
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146 local resource;
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147 if stanza.attr.type == "set" then
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148 local bind = stanza.tags[1];
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149 resource = bind:child_with_name("resource");
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150 resource = resource and #resource.tags == 0 and resource[1] or nil;
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151 end
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152 local success, err_type, err, err_msg = sm_bind_resource(origin, resource);
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153 if success then
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154 origin.send(st.reply(stanza)
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155 :tag("bind", { xmlns = xmlns_bind })
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156 :tag("jid"):text(origin.full_jid));
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157 origin.log("debug", "Resource bound: %s", origin.full_jid);
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158 else
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159 origin.send(st.error_reply(stanza, err_type, err, err_msg));
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160 origin.log("debug", "Resource bind failed: %s", err_msg or err);
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161 end
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162 return true;
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163 end);
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164
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165 local function handle_legacy_session(event)
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166 event.origin.send(st.reply(event.stanza));
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167 return true;
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168 end
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169
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170 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session);
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171 module:hook("iq/host/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session);