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mod_sasl2/mod_sasl2.lua @ 6205:8ff8121ff603
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author | Matthew Wild <mwild1@gmail.com> |
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date | Thu, 13 Mar 2025 13:00:26 +0000 |
parent | 6149:045abdc53ba4 |
rev | line source |
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1 -- Prosody IM |
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2 -- Copyright (C) 2019 Kim Alvefur |
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3 -- |
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4 -- This project is MIT/X11 licensed. Please see the |
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5 -- COPYING file in the source package for more information. |
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6 -- |
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7 -- XEP-0388: Extensible SASL Profile |
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8 -- |
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9 |
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10 local st = require "util.stanza"; |
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11 local errors = require "util.error"; |
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12 local base64 = require "util.encodings".base64; |
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13 local jid_join = require "util.jid".join; |
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14 local set = require "util.set"; |
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15 |
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16 local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler; |
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17 local sm_make_authenticated = require "core.sessionmanager".make_authenticated; |
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18 |
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19 local xmlns_sasl2 = "urn:xmpp:sasl:2"; |
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20 |
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21 local secure_auth_only = module:get_option_boolean("c2s_require_encryption", module:get_option_boolean("require_encryption", true)); |
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22 local allow_unencrypted_plain_auth = module:get_option_boolean("allow_unencrypted_plain_auth", false) |
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23 local insecure_mechanisms = module:get_option_set("insecure_sasl_mechanisms", allow_unencrypted_plain_auth and {} or {"PLAIN", "LOGIN"}); |
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24 local disabled_mechanisms = module:get_option_set("disable_sasl_mechanisms", { "DIGEST-MD5" }); |
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25 |
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26 local host = module.host; |
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27 |
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28 local function tls_unique(self) |
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29 return self.userdata["tls-unique"]:ssl_peerfinished(); |
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30 end |
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31 |
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32 local function tls_exporter(conn) |
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33 if not conn.ssl_exportkeyingmaterial then return end |
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34 return conn:ssl_exportkeyingmaterial("EXPORTER-Channel-Binding", 32, ""); |
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35 end |
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36 |
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37 local function sasl_tls_exporter(self) |
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38 return tls_exporter(self.userdata["tls-exporter"]); |
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39 end |
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40 |
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41 module:hook("stream-features", function(event) |
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42 local origin, features = event.origin, event.features; |
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43 local log = origin.log or module._log; |
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44 |
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45 if origin.type ~= "c2s_unauthed" then |
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46 log("debug", "Already authenticated"); |
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47 return |
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48 elseif secure_auth_only and not origin.secure then |
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49 log("debug", "Not offering authentication on insecure connection"); |
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50 return; |
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51 end |
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52 |
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53 local sasl_handler = usermanager_get_sasl_handler(host, origin) |
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54 origin.sasl_handler = sasl_handler; |
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55 |
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56 local channel_bindings = set.new() |
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57 if origin.encrypted then |
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58 -- check whether LuaSec has the nifty binding to the function needed for tls-unique |
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59 -- FIXME: would be nice to have this check only once and not for every socket |
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60 if sasl_handler.add_cb_handler then |
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61 local info = origin.conn:ssl_info(); |
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62 if info and info.protocol == "TLSv1.3" then |
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63 log("debug", "Channel binding 'tls-unique' undefined in context of TLS 1.3"); |
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64 if tls_exporter(origin.conn) then |
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65 log("debug", "Channel binding 'tls-exporter' supported"); |
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66 sasl_handler:add_cb_handler("tls-exporter", sasl_tls_exporter); |
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67 channel_bindings:add("tls-exporter"); |
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68 else |
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69 log("debug", "Channel binding 'tls-exporter' not supported"); |
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70 end |
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71 elseif origin.conn.ssl_peerfinished and origin.conn:ssl_peerfinished() then |
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72 log("debug", "Channel binding 'tls-unique' supported"); |
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73 sasl_handler:add_cb_handler("tls-unique", tls_unique); |
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74 channel_bindings:add("tls-unique"); |
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75 else |
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76 log("debug", "Channel binding 'tls-unique' not supported (by LuaSec?)"); |
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77 end |
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78 sasl_handler["userdata"] = { |
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79 ["tls-unique"] = origin.conn; |
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80 ["tls-exporter"] = origin.conn; |
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81 }; |
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82 else |
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83 log("debug", "Channel binding not supported by SASL handler"); |
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84 end |
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85 end |
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86 |
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87 local mechanisms = st.stanza("authentication", { xmlns = xmlns_sasl2 }); |
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88 |
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89 local available_mechanisms = sasl_handler:mechanisms() |
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90 for mechanism in pairs(available_mechanisms) do |
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91 if disabled_mechanisms:contains(mechanism) then |
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92 log("debug", "Not offering disabled mechanism %s", mechanism); |
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93 elseif not origin.secure and insecure_mechanisms:contains(mechanism) then |
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94 log("debug", "Not offering mechanism %s on insecure connection", mechanism); |
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95 else |
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96 log("debug", "Offering mechanism %s", mechanism); |
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97 mechanisms:text_tag("mechanism", mechanism); |
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98 end |
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99 end |
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100 |
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101 features:add_direct_child(mechanisms); |
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102 |
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103 local inline = st.stanza("inline"); |
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104 module:fire_event("advertise-sasl-features", { origin = origin, features = inline, stream = event.stream }); |
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105 mechanisms:add_direct_child(inline); |
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106 end, 1); |
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107 |
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108 local function handle_status(session, status, ret, err_msg) |
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109 local err = nil; |
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110 if status == "error" then |
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111 ret, err = nil, ret; |
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112 if not errors.is_err(err) then |
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113 err = errors.new({ condition = err, text = err_msg }, { session = session }); |
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114 end |
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115 end |
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116 |
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117 return module:fire_event("sasl2/"..session.base_type.."/"..status, { |
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118 session = session, |
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119 message = ret; |
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120 error = err; |
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121 error_text = err_msg; |
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122 }); |
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123 end |
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124 |
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125 module:hook("sasl2/c2s/failure", function (event) |
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126 module:fire_event("authentication-failure", event); |
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127 local session, condition, text = event.session, event.message, event.error_text; |
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128 |
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129 session.sasl_handler = session.sasl_handler:clean_clone(); |
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130 |
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131 local failure = st.stanza("failure", { xmlns = xmlns_sasl2 }) |
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132 :tag(condition, { xmlns = "urn:ietf:params:xml:ns:xmpp-sasl" }):up(); |
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133 if text then |
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134 failure:text_tag("text", text); |
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135 end |
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136 session.send(failure); |
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137 return true; |
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138 end); |
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139 |
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140 module:hook("sasl2/c2s/error", function (event) |
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141 local session = event.session |
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142 session.send(st.stanza("failure", { xmlns = xmlns_sasl2 }) |
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143 :tag(event.error and event.error.condition)); |
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144 return true; |
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145 end); |
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146 |
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147 module:hook("sasl2/c2s/challenge", function (event) |
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148 local session = event.session; |
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149 session.send(st.stanza("challenge", { xmlns = xmlns_sasl2 }) |
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150 :text(base64.encode(event.message))); |
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151 return true; |
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152 end); |
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153 |
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154 module:hook("sasl2/c2s/success", function (event) |
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155 local session = event.session |
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156 local ok, err = sm_make_authenticated(session, session.sasl_handler.username); |
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157 if not ok then |
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158 handle_status(session, "failure", err); |
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159 return true; |
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160 end |
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161 event.success = st.stanza("success", { xmlns = xmlns_sasl2 }); |
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162 if event.message then |
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163 event.success:text_tag("additional-data", base64.encode(event.message)); |
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164 end |
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165 end, 1000); |
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166 |
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167 module:hook("sasl2/c2s/success", function (event) |
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168 local session = event.session |
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169 event.success:text_tag("authorization-identifier", jid_join(session.username, session.host, session.resource)); |
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170 session.send(event.success); |
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171 end, -1000); |
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172 |
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173 module:hook("sasl2/c2s/success", function (event) |
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174 module:fire_event("authentication-success", event); |
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175 local session = event.session; |
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176 local features = st.stanza("stream:features"); |
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177 module:fire_event("stream-features", { origin = session, features = features }); |
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178 session.send(features); |
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179 end, -1500); |
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180 |
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181 -- The gap here is to allow modules to do stuff to the stream after the stanza |
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182 -- is sent, but before we proceed with anything else. This is expected to be |
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183 -- a common pattern with SASL2, which allows atomic negotiation of a bunch of |
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184 -- stream features. |
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185 module:hook("sasl2/c2s/success", function (event) --luacheck: ignore 212/event |
5063
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186 event.session.sasl_handler = nil; |
5021
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187 return true; |
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188 end, -2000); |
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189 |
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190 local function process_cdata(session, cdata) |
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191 if cdata then |
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192 cdata = base64.decode(cdata); |
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193 if not cdata then |
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194 return handle_status(session, "failure", "incorrect-encoding"); |
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195 end |
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196 end |
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197 return handle_status(session, session.sasl_handler:process(cdata)); |
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198 end |
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199 |
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200 module:hook_tag(xmlns_sasl2, "authenticate", function (session, auth) |
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201 if secure_auth_only and not session.secure then |
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202 return handle_status(session, "failure", "encryption-required"); |
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203 end |
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204 local sasl_handler = session.sasl_handler; |
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205 if not sasl_handler then |
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206 sasl_handler = usermanager_get_sasl_handler(host, session); |
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207 session.sasl_handler = sasl_handler; |
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208 end |
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209 local mechanism = assert(auth.attr.mechanism); |
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210 if not sasl_handler:select(mechanism) then |
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211 return handle_status(session, "failure", "invalid-mechanism"); |
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212 end |
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213 local user_agent = auth:get_child("user-agent"); |
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214 if user_agent then |
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215 session.client_id = user_agent.attr.id; |
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216 sasl_handler.user_agent = { |
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217 software = user_agent:get_child_text("software"); |
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218 device = user_agent:get_child_text("device"); |
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219 }; |
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220 end |
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221 local initial = auth:get_child_text("initial-response"); |
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222 return process_cdata(session, initial); |
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223 end); |
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224 |
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mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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225 module:hook_tag(xmlns_sasl2, "response", function (session, response) |
5ae2e865eea0
mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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226 local sasl_handler = session.sasl_handler; |
5ae2e865eea0
mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
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changeset
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227 if not sasl_handler or not sasl_handler.selected then |
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fd154db7c8fc
mod_sasl2: Fix handling of various failure/error cases
Matthew Wild <mwild1@gmail.com>
parents:
5023
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228 return handle_status(session, "failure", "invalid-mechanism"); |
3905
5ae2e865eea0
mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
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changeset
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229 end |
5ae2e865eea0
mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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230 return process_cdata(session, response:get_text()); |
5ae2e865eea0
mod_sasl2: Experimental implementation of XEP-0388
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
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231 end); |