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plugins/mod_saslauth.lua @ 6425:436a670a0189
mod_saslauth: Stricter SASL EXTERNAL handling more in line with XEP-0178
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Tue, 23 Sep 2014 19:29:14 +0200 |
| parent | 6424:89c42aff8510 |
| child | 6427:7653bbd5247e |
| 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 usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler; |
| 38 | 17 local tostring = tostring; |
| 18 | |
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19 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption"); |
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20 local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth") |
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21 |
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22 local log = module._log; |
| 38 | 23 |
| 24 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl'; | |
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25 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind'; |
| 38 | 26 |
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27 local function build_reply(status, ret, err_msg) |
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28 local reply = st.stanza(status, {xmlns = xmlns_sasl}); |
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29 if status == "challenge" then |
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30 --log("debug", "CHALLENGE: %s", ret or ""); |
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31 reply:text(base64.encode(ret or "")); |
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32 elseif status == "failure" then |
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33 reply:tag(ret):up(); |
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34 if err_msg then reply:tag("text"):text(err_msg); end |
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35 elseif status == "success" then |
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36 --log("debug", "SUCCESS: %s", ret or ""); |
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37 reply:text(base64.encode(ret or "")); |
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38 else |
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39 module:log("error", "Unknown sasl status: %s", status); |
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40 end |
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41 return reply; |
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42 end |
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43 |
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44 local function handle_status(session, status, ret, err_msg) |
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45 if status == "failure" then |
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46 module:fire_event("authentication-failure", { session = session, condition = ret, text = err_msg }); |
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47 session.sasl_handler = session.sasl_handler:clean_clone(); |
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48 elseif status == "success" then |
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49 local ok, err = sm_make_authenticated(session, session.sasl_handler.username); |
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50 if ok then |
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51 module:fire_event("authentication-success", { session = session }); |
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52 session.sasl_handler = nil; |
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53 session:reset_stream(); |
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54 else |
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55 module:log("warn", "SASL succeeded but username was invalid"); |
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56 module:fire_event("authentication-failure", { session = session, condition = "not-authorized", text = err }); |
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57 session.sasl_handler = session.sasl_handler:clean_clone(); |
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58 return "failure", "not-authorized", "User authenticated successfully, but username was invalid"; |
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59 end |
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60 end |
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61 return status, ret, err_msg; |
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62 end |
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63 |
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64 local function sasl_process_cdata(session, stanza) |
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65 local text = stanza[1]; |
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66 if text then |
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67 text = base64.decode(text); |
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68 --log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " ")); |
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69 if not text then |
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70 session.sasl_handler = nil; |
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71 session.send(build_reply("failure", "incorrect-encoding")); |
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72 return true; |
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73 end |
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74 end |
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75 local status, ret, err_msg = session.sasl_handler:process(text); |
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76 status, ret, err_msg = handle_status(session, status, ret, err_msg); |
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77 local s = build_reply(status, ret, err_msg); |
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78 log("debug", "sasl reply: %s", tostring(s)); |
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79 session.send(s); |
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80 return true; |
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81 end |
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82 |
| 3651 | 83 module:hook_stanza(xmlns_sasl, "success", function (session, stanza) |
| 84 if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end | |
| 85 module:log("debug", "SASL EXTERNAL with %s succeeded", session.to_host); | |
| 86 session.external_auth = "succeeded" | |
| 87 session:reset_stream(); | |
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88 session:open_stream(session.from_host, session.to_host); |
| 3651 | 89 |
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90 module:fire_event("s2s-authenticated", { session = session, host = session.to_host }); |
| 3651 | 91 return true; |
| 92 end) | |
| 93 | |
| 94 module:hook_stanza(xmlns_sasl, "failure", function (session, stanza) | |
| 95 if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end | |
| 96 | |
| 97 module:log("info", "SASL EXTERNAL with %s failed", session.to_host) | |
| 98 -- TODO: Log the failure reason | |
| 99 session.external_auth = "failed" | |
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100 session:close(); |
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101 return true; |
| 3651 | 102 end, 500) |
| 103 | |
| 104 module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza) | |
| 105 if session.type ~= "s2sout_unauthed" or not session.secure then return; end | |
| 106 | |
| 107 local mechanisms = stanza:get_child("mechanisms", xmlns_sasl) | |
| 108 if mechanisms then | |
| 109 for mech in mechanisms:childtags() do | |
| 110 if mech[1] == "EXTERNAL" then | |
| 111 module:log("debug", "Initiating SASL EXTERNAL with %s", session.to_host); | |
| 112 local reply = st.stanza("auth", {xmlns = xmlns_sasl, mechanism = "EXTERNAL"}); | |
| 113 reply:text(base64.encode(session.from_host)) | |
| 114 session.sends2s(reply) | |
| 115 session.external_auth = "attempting" | |
| 116 return true | |
| 117 end | |
| 118 end | |
| 119 end | |
| 120 end, 150); | |
| 121 | |
| 122 local function s2s_external_auth(session, stanza) | |
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123 if session.external_auth ~= "offered" then return end -- Unexpected request |
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124 |
| 3651 | 125 local mechanism = stanza.attr.mechanism; |
| 126 | |
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127 if mechanism ~= "EXTERNAL" then |
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128 session.sends2s(build_reply("failure", "invalid-mechanism")); |
| 3651 | 129 return true; |
| 130 end | |
| 131 | |
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132 if not session.secure then |
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133 session.sends2s(build_reply("failure", "encryption-required")); |
| 3651 | 134 return true; |
| 135 end | |
| 136 | |
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137 local text = stanza[1]; |
| 3651 | 138 if not text then |
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139 session.sends2s(build_reply("failure", "malformed-request")); |
| 3651 | 140 return true; |
| 141 end | |
| 142 | |
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143 text = base64.decode(text); |
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144 if not text then |
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145 session.sends2s(build_reply("failure", "incorrect-encoding")); |
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146 return true; |
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147 end |
| 3651 | 148 |
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149 -- The text value is either "" or equals session.from_host |
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150 if not ( text == "" or text == session.from_host ) then |
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151 session.sends2s(build_reply("failure", "invalid-authzid")); |
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152 return true; |
| 3651 | 153 end |
| 154 | |
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155 -- We've already verified the external cert identity before offering EXTERNAL |
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156 if session.cert_chain_status ~= "valid" or session.cert_identity_status ~= "valid" then |
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157 session.sends2s(build_reply("failure", "not-authorized")); |
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158 session:close(); |
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159 return true; |
| 3651 | 160 end |
|
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161 |
|
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162 -- Success! |
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163 session.external_auth = "succeeded"; |
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164 session.sends2s(build_reply("success")); |
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165 module:log("info", "Accepting SASL EXTERNAL identity from %s", session.from_host); |
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166 module:fire_event("s2s-authenticated", { session = session, host = session.from_host }); |
| 3651 | 167 session:reset_stream(); |
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168 return true; |
| 3651 | 169 end |
| 170 | |
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171 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function(event) |
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172 local session, stanza = event.origin, event.stanza; |
| 3651 | 173 if session.type == "s2sin_unauthed" then |
| 174 return s2s_external_auth(session, stanza) | |
| 175 end | |
| 176 | |
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177 if session.type ~= "c2s_unauthed" or module:get_host_type() ~= "local" then return; end |
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178 |
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179 if session.sasl_handler and session.sasl_handler.selected then |
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180 session.sasl_handler = nil; -- allow starting a new SASL negotiation before completing an old one |
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181 end |
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182 if not session.sasl_handler then |
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183 session.sasl_handler = usermanager_get_sasl_handler(module.host, session); |
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184 end |
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185 local mechanism = stanza.attr.mechanism; |
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186 if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then |
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187 session.send(build_reply("failure", "encryption-required")); |
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188 return true; |
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189 end |
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190 local valid_mechanism = session.sasl_handler:select(mechanism); |
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191 if not valid_mechanism then |
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192 session.send(build_reply("failure", "invalid-mechanism")); |
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193 return true; |
|
295
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194 end |
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195 return sasl_process_cdata(session, stanza); |
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196 end); |
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197 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:response", function(event) |
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198 local session = event.origin; |
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199 if not(session.sasl_handler and session.sasl_handler.selected) then |
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200 session.send(build_reply("failure", "not-authorized", "Out of order SASL element")); |
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201 return true; |
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202 end |
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203 return sasl_process_cdata(session, event.stanza); |
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204 end); |
|
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205 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:abort", function(event) |
|
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206 local session = event.origin; |
|
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207 session.sasl_handler = nil; |
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208 session.send(build_reply("failure", "aborted")); |
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209 return true; |
|
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210 end); |
|
284
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diff
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211 |
|
357
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diff
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212 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' }; |
|
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213 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' }; |
|
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214 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' }; |
|
2612
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215 module:hook("stream-features", function(event) |
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216 local origin, features = event.origin, event.features; |
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217 if not origin.username then |
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218 if secure_auth_only and not origin.secure then |
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219 return; |
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220 end |
|
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221 origin.sasl_handler = usermanager_get_sasl_handler(module.host, origin); |
|
5860
87e2fafba5df
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diff
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|
222 if origin.encrypted then |
|
5838
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223 -- check wether LuaSec has the nifty binding to the function needed for tls-unique |
|
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224 -- FIXME: would be nice to have this check only once and not for every socket |
|
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225 if origin.conn:socket().getpeerfinished and origin.sasl_handler.add_cb_handler then |
|
5838
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226 origin.sasl_handler:add_cb_handler("tls-unique", function(self) |
|
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227 return self.userdata:getpeerfinished(); |
|
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228 end); |
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229 origin.sasl_handler["userdata"] = origin.conn:socket(); |
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230 end |
|
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231 end |
|
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232 local mechanisms = st.stanza("mechanisms", mechanisms_attr); |
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233 for mechanism in pairs(origin.sasl_handler:mechanisms()) do |
|
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234 if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then |
|
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235 mechanisms:tag("mechanism"):text(mechanism):up(); |
|
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236 end |
|
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237 end |
|
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238 if mechanisms[1] then features:add_child(mechanisms); end |
|
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239 else |
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240 features:tag("bind", bind_attr):tag("required"):up():up(); |
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241 features:tag("session", xmpp_session_attr):tag("optional"):up():up(); |
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242 end |
|
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243 end); |
|
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244 |
| 3651 | 245 module:hook("s2s-stream-features", function(event) |
| 246 local origin, features = event.origin, event.features; | |
| 247 if origin.secure and origin.type == "s2sin_unauthed" then | |
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248 -- Offer EXTERNAL only if both chain and identity is valid. |
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249 if origin.cert_chain_status == "valid" and origin.cert_identity_status == "valid" then |
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250 module:log("debug", "Offering SASL EXTERNAL"); |
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251 origin.external_auth = "offered" |
| 3651 | 252 features:tag("mechanisms", { xmlns = xmlns_sasl }) |
| 253 :tag("mechanism"):text("EXTERNAL") | |
| 254 :up():up(); | |
| 255 end | |
| 256 end | |
| 257 end); | |
| 258 | |
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259 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event) |
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260 local origin, stanza = event.origin, event.stanza; |
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261 local resource; |
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262 if stanza.attr.type == "set" then |
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263 local bind = stanza.tags[1]; |
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264 resource = bind:get_child("resource"); |
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265 resource = resource and #resource.tags == 0 and resource[1] or nil; |
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266 end |
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267 local success, err_type, err, err_msg = sm_bind_resource(origin, resource); |
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268 if success then |
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269 origin.send(st.reply(stanza) |
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270 :tag("bind", { xmlns = xmlns_bind }) |
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271 :tag("jid"):text(origin.full_jid)); |
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272 origin.log("debug", "Resource bound: %s", origin.full_jid); |
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273 else |
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274 origin.send(st.error_reply(stanza, err_type, err, err_msg)); |
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275 origin.log("debug", "Resource bind failed: %s", err_msg or err); |
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276 end |
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277 return true; |
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278 end); |
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279 |
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280 local function handle_legacy_session(event) |
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281 event.origin.send(st.reply(event.stanza)); |
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282 return true; |
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283 end |
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284 |
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285 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); |
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286 module:hook("iq/host/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); |
