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plugins/mod_saslauth.lua @ 3522:4646b5b039ca
mod_private: Updated to use the new events API. Smaller, more robust.
author | Waqas Hussain <waqas20@gmail.com> |
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date | Sat, 16 Oct 2010 04:11:48 +0500 |
parent | 3468:d50e2c937717 |
child | 3523:32a0c3816d73 |
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 -- |
758 | 5 -- This project is MIT/X11 licensed. Please see the |
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 |
38 | 10 |
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; |
38 | 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 t_concat, t_insert = table.concat, table.insert; |
38 | 19 local tostring = tostring; |
20 | |
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21 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption"); |
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22 local anonymous_login = module:get_option("anonymous_login"); |
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23 local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth") |
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24 |
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25 local log = module._log; |
38 | 26 |
27 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl'; | |
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28 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind'; |
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29 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas'; |
38 | 30 |
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31 local new_sasl = require "util.sasl".new; |
38 | 32 |
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33 local anonymous_authentication_profile = { |
2193 | 34 anonymous = function(username, realm) |
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35 return true; -- for normal usage you should always return true here |
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36 end |
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37 }; |
38 | 38 |
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39 local function build_reply(status, ret, err_msg) |
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40 local reply = st.stanza(status, {xmlns = xmlns_sasl}); |
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41 if status == "challenge" then |
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42 --log("debug", "CHALLENGE: %s", ret or ""); |
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43 reply:text(base64.encode(ret or "")); |
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44 elseif status == "failure" then |
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45 reply:tag(ret):up(); |
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46 if err_msg then reply:tag("text"):text(err_msg); end |
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47 elseif status == "success" then |
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48 --log("debug", "SUCCESS: %s", ret or ""); |
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49 reply:text(base64.encode(ret or "")); |
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50 else |
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51 module:log("error", "Unknown sasl status: %s", status); |
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52 end |
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53 return reply; |
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54 end |
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55 |
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56 local function handle_status(session, status, ret, err_msg) |
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57 if status == "failure" then |
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58 session.sasl_handler = session.sasl_handler:clean_clone(); |
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59 elseif status == "success" then |
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60 local username = nodeprep(session.sasl_handler.username); |
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61 |
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62 local ok, err = sm_make_authenticated(session, session.sasl_handler.username); |
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63 if ok then |
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64 session.sasl_handler = nil; |
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65 session:reset_stream(); |
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66 else |
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67 module:log("warn", "SASL succeeded but username was invalid"); |
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68 session.sasl_handler = session.sasl_handler:clean_clone(); |
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69 return "failure", "not-authorized", "User authenticated successfully, but username was invalid"; |
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70 end |
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71 end |
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72 return status, ret, err_msg; |
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73 end |
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74 |
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75 local function sasl_handler(session, stanza) |
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76 if stanza.name == "auth" then |
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77 -- FIXME ignoring duplicates because ejabberd does |
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78 local mechanism = stanza.attr.mechanism; |
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79 if anonymous_login then |
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80 if mechanism ~= "ANONYMOUS" then |
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81 return session.send(build_reply("failure", "invalid-mechanism")); |
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82 end |
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83 elseif mechanism == "ANONYMOUS" then |
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84 return session.send(build_reply("failure", "mechanism-too-weak")); |
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85 end |
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86 if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then |
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87 return session.send(build_reply("failure", "encryption-required")); |
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88 end |
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89 local valid_mechanism = session.sasl_handler:select(mechanism); |
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90 if not valid_mechanism then |
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91 return session.send(build_reply("failure", "invalid-mechanism")); |
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92 end |
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93 elseif not session.sasl_handler then |
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94 return; -- FIXME ignoring out of order stanzas because ejabberd does |
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95 end |
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96 local text = stanza[1]; |
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97 if text then |
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98 text = base64.decode(text); |
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99 --log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " ")); |
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100 if not text then |
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101 session.sasl_handler = nil; |
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102 session.send(build_reply("failure", "incorrect-encoding")); |
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103 return; |
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104 end |
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105 end |
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106 local status, ret, err_msg = session.sasl_handler:process(text); |
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107 status, ret, err_msg = handle_status(session, status, ret, err_msg); |
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108 local s = build_reply(status, ret, err_msg); |
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109 log("debug", "sasl reply: %s", tostring(s)); |
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110 session.send(s); |
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111 end |
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112 |
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113 module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler); |
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114 module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler); |
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115 module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler); |
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116 |
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117 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' }; |
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118 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' }; |
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119 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' }; |
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120 module:hook("stream-features", function(event) |
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121 local origin, features = event.origin, event.features; |
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122 if not origin.username then |
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123 if secure_auth_only and not origin.secure then |
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124 return; |
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125 end |
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126 if anonymous_login then |
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127 origin.sasl_handler = new_sasl(module.host, anonymous_authentication_profile); |
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128 else |
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129 origin.sasl_handler = usermanager_get_sasl_handler(module.host); |
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130 end |
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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:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind", function(session, stanza) |
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145 log("debug", "Client requesting a resource bind"); |
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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 if bind and bind.attr.xmlns == xmlns_bind then |
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150 resource = bind:child_with_name("resource"); |
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151 if resource then |
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152 resource = resource[1]; |
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153 end |
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154 end |
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155 end |
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156 local success, err_type, err, err_msg = sm_bind_resource(session, resource); |
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157 if not success then |
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158 session.send(st.error_reply(stanza, err_type, err, err_msg)); |
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159 else |
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160 session.send(st.reply(stanza) |
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161 :tag("bind", { xmlns = xmlns_bind}) |
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162 :tag("jid"):text(session.full_jid)); |
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163 end |
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164 end); |
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165 |
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166 module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session", function(session, stanza) |
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167 log("debug", "Client requesting a session"); |
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168 session.send(st.reply(stanza)); |
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169 end); |