Software / code / prosody
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plugins/mod_saslauth.lua @ 6492:0d07fdc07d8c
mod_saslauth: Make it possible to disable certain mechanisms
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Tue, 21 Oct 2014 14:38:40 +0200 |
| parent | 6491:f71643256d50 |
| child | 6493:4e51b5e81bdd |
| 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_boolean("c2s_require_encryption", module:get_option_boolean("require_encryption", false)); |
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20 local allow_unencrypted_plain_auth = module:get_option_boolean("allow_unencrypted_plain_auth", false) |
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21 local insecure_mechanisms = module:get_option_set("allow_unencrypted_sasl", allow_unencrypted_plain_auth and {} or {"PLAIN", "LOGIN"}); |
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22 local disabled_mechanisms = module:get_option_set("disable_sasl_mechanisms", {}); |
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23 |
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24 local log = module._log; |
| 38 | 25 |
| 26 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl'; | |
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27 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind'; |
| 38 | 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 == "failure" then |
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32 reply:tag(ret):up(); |
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33 if err_msg then reply:tag("text"):text(err_msg); end |
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34 elseif status == "challenge" or status == "success" then |
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35 if ret == "" then |
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36 reply:text("=") |
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37 elseif ret then |
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38 reply:text(base64.encode(ret)); |
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39 end |
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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 module:fire_event("authentication-failure", { session = session, condition = ret, text = err_msg }); |
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49 session.sasl_handler = session.sasl_handler:clean_clone(); |
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50 elseif status == "success" then |
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51 local ok, err = sm_make_authenticated(session, session.sasl_handler.username); |
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52 if ok then |
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53 module:fire_event("authentication-success", { session = session }); |
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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 module:fire_event("authentication-failure", { session = session, condition = "not-authorized", text = err }); |
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59 session.sasl_handler = session.sasl_handler:clean_clone(); |
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60 return "failure", "not-authorized", "User authenticated successfully, but username was invalid"; |
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61 end |
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62 end |
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63 return status, ret, err_msg; |
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64 end |
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65 |
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66 local function sasl_process_cdata(session, stanza) |
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67 local text = stanza[1]; |
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68 if text then |
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69 text = base64.decode(text); |
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70 --log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " ")); |
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71 if not text then |
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72 session.sasl_handler = nil; |
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73 session.send(build_reply("failure", "incorrect-encoding")); |
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74 return true; |
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75 end |
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76 end |
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77 local status, ret, err_msg = session.sasl_handler:process(text); |
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78 status, ret, err_msg = handle_status(session, status, ret, err_msg); |
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79 local s = build_reply(status, ret, err_msg); |
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80 log("debug", "sasl reply: %s", tostring(s)); |
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81 session.send(s); |
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82 return true; |
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83 end |
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84 |
| 3651 | 85 module:hook_stanza(xmlns_sasl, "success", function (session, stanza) |
| 86 if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end | |
| 87 module:log("debug", "SASL EXTERNAL with %s succeeded", session.to_host); | |
| 88 session.external_auth = "succeeded" | |
| 89 session:reset_stream(); | |
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90 session:open_stream(session.from_host, session.to_host); |
| 3651 | 91 |
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92 module:fire_event("s2s-authenticated", { session = session, host = session.to_host }); |
| 3651 | 93 return true; |
| 94 end) | |
| 95 | |
| 96 module:hook_stanza(xmlns_sasl, "failure", function (session, stanza) | |
| 97 if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end | |
| 98 | |
| 99 module:log("info", "SASL EXTERNAL with %s failed", session.to_host) | |
| 100 -- TODO: Log the failure reason | |
| 101 session.external_auth = "failed" | |
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102 session:close(); |
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103 return true; |
| 3651 | 104 end, 500) |
| 105 | |
| 106 module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza) | |
| 107 if session.type ~= "s2sout_unauthed" or not session.secure then return; end | |
| 108 | |
| 109 local mechanisms = stanza:get_child("mechanisms", xmlns_sasl) | |
| 110 if mechanisms then | |
| 111 for mech in mechanisms:childtags() do | |
| 112 if mech[1] == "EXTERNAL" then | |
| 113 module:log("debug", "Initiating SASL EXTERNAL with %s", session.to_host); | |
| 114 local reply = st.stanza("auth", {xmlns = xmlns_sasl, mechanism = "EXTERNAL"}); | |
| 115 reply:text(base64.encode(session.from_host)) | |
| 116 session.sends2s(reply) | |
| 117 session.external_auth = "attempting" | |
| 118 return true | |
| 119 end | |
| 120 end | |
| 121 end | |
| 122 end, 150); | |
| 123 | |
| 124 local function s2s_external_auth(session, stanza) | |
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125 if session.external_auth ~= "offered" then return end -- Unexpected request |
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126 |
| 3651 | 127 local mechanism = stanza.attr.mechanism; |
| 128 | |
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129 if mechanism ~= "EXTERNAL" then |
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130 session.sends2s(build_reply("failure", "invalid-mechanism")); |
| 3651 | 131 return true; |
| 132 end | |
| 133 | |
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134 if not session.secure then |
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135 session.sends2s(build_reply("failure", "encryption-required")); |
| 3651 | 136 return true; |
| 137 end | |
| 138 | |
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139 local text = stanza[1]; |
| 3651 | 140 if not text then |
|
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141 session.sends2s(build_reply("failure", "malformed-request")); |
| 3651 | 142 return true; |
| 143 end | |
| 144 | |
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145 text = base64.decode(text); |
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146 if not text then |
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147 session.sends2s(build_reply("failure", "incorrect-encoding")); |
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148 return true; |
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149 end |
| 3651 | 150 |
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151 -- The text value is either "" or equals session.from_host |
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152 if not ( text == "" or text == session.from_host ) then |
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153 session.sends2s(build_reply("failure", "invalid-authzid")); |
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154 return true; |
| 3651 | 155 end |
| 156 | |
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157 -- We've already verified the external cert identity before offering EXTERNAL |
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158 if session.cert_chain_status ~= "valid" or session.cert_identity_status ~= "valid" then |
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159 session.sends2s(build_reply("failure", "not-authorized")); |
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160 session:close(); |
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161 return true; |
| 3651 | 162 end |
|
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163 |
|
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164 -- Success! |
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165 session.external_auth = "succeeded"; |
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166 session.sends2s(build_reply("success")); |
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167 module:log("info", "Accepting SASL EXTERNAL identity from %s", session.from_host); |
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168 module:fire_event("s2s-authenticated", { session = session, host = session.from_host }); |
| 3651 | 169 session:reset_stream(); |
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170 return true; |
| 3651 | 171 end |
| 172 | |
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173 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function(event) |
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174 local session, stanza = event.origin, event.stanza; |
| 3651 | 175 if session.type == "s2sin_unauthed" then |
| 176 return s2s_external_auth(session, stanza) | |
| 177 end | |
| 178 | |
|
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179 if session.type ~= "c2s_unauthed" or module:get_host_type() ~= "local" then return; end |
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180 |
|
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181 if session.sasl_handler and session.sasl_handler.selected then |
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182 session.sasl_handler = nil; -- allow starting a new SASL negotiation before completing an old one |
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183 end |
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184 if not session.sasl_handler then |
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185 session.sasl_handler = usermanager_get_sasl_handler(module.host, session); |
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186 end |
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187 local mechanism = stanza.attr.mechanism; |
|
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188 if not session.secure and (secure_auth_only or insecure_mechanisms:contains(mechanism)) then |
|
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189 session.send(build_reply("failure", "encryption-required")); |
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190 return true; |
|
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191 elseif disabled_mechanisms:contains(mechanism) then |
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192 session.send(build_reply("failure", "invalid-mechanism")); |
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193 return true; |
|
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194 end |
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195 local valid_mechanism = session.sasl_handler:select(mechanism); |
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196 if not valid_mechanism then |
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197 session.send(build_reply("failure", "invalid-mechanism")); |
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198 return true; |
|
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199 end |
|
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200 return sasl_process_cdata(session, stanza); |
|
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201 end); |
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202 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:response", function(event) |
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203 local session = event.origin; |
|
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204 if not(session.sasl_handler and session.sasl_handler.selected) then |
|
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205 session.send(build_reply("failure", "not-authorized", "Out of order SASL element")); |
|
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206 return true; |
|
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207 end |
|
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diff
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208 return sasl_process_cdata(session, event.stanza); |
|
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209 end); |
|
3548
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diff
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|
210 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:abort", function(event) |
|
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211 local session = event.origin; |
|
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diff
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212 session.sasl_handler = nil; |
|
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213 session.send(build_reply("failure", "aborted")); |
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214 return true; |
|
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215 end); |
|
284
4f540755260c
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281
diff
changeset
|
216 |
|
357
17bcecb06420
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313
diff
changeset
|
217 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' }; |
|
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Use a stanza for c2s stream features instead of an array of strings. Removes a FIXME.
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313
diff
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|
218 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' }; |
|
17bcecb06420
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313
diff
changeset
|
219 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' }; |
|
2612
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diff
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220 module:hook("stream-features", function(event) |
|
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221 local origin, features = event.origin, event.features; |
|
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222 if not origin.username then |
|
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diff
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|
223 if secure_auth_only and not origin.secure then |
|
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224 return; |
|
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225 end |
|
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0545a574667b
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diff
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|
226 origin.sasl_handler = usermanager_get_sasl_handler(module.host, origin); |
|
5860
87e2fafba5df
mod_saslauth: Collect data for channel binding only if we know for sure that the stream is encrypted
Kim Alvefur <zash@zash.se>
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5843
diff
changeset
|
227 if origin.encrypted then |
|
5838
a2659baf8332
mod_saslauth: Check whether LuaSec supports getpeerfinished() binding.
Tobias Markmann <tm@ayena.de>
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5834
diff
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|
228 -- check wether LuaSec has the nifty binding to the function needed for tls-unique |
|
a2659baf8332
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229 -- FIXME: would be nice to have this check only once and not for every socket |
|
6014
d61026bee038
mod_saslauth: Make sure sasl handler has add_cb_handler (fixes #392)
Kim Alvefur <zash@zash.se>
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5860
diff
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|
230 if origin.conn:socket().getpeerfinished and origin.sasl_handler.add_cb_handler then |
|
5838
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|
231 origin.sasl_handler:add_cb_handler("tls-unique", function(self) |
|
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|
232 return self.userdata:getpeerfinished(); |
|
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233 end); |
|
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|
234 origin.sasl_handler["userdata"] = origin.conn:socket(); |
|
a2659baf8332
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5834
diff
changeset
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235 end |
|
5832
7d100d917243
mod_saslauth: Set secure socket as SASL object user data for secure sessions.
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3983
diff
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236 end |
|
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d322c4553f97
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4392
diff
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|
237 local mechanisms = st.stanza("mechanisms", mechanisms_attr); |
|
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diff
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|
238 for mechanism in pairs(origin.sasl_handler:mechanisms()) do |
|
6492
0d07fdc07d8c
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diff
changeset
|
239 if (not disabled_mechanisms:contains(mechanism)) and (origin.secure or not insecure_mechanisms:contains(mechanism)) then |
|
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diff
changeset
|
240 mechanisms:tag("mechanism"):text(mechanism):up(); |
|
3417
53e854b52110
mod_saslauth: Check for unencrypted PLAIN auth in mod_saslauth instead of the SASL handler (makes it work for Cyrus SASL).
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diff
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|
241 end |
|
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|
242 end |
|
6489
1f07c72112d2
mod_saslauth: Log warning if no SASL mechanisms were offered
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parents:
6488
diff
changeset
|
243 if mechanisms[1] then |
|
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244 features:add_child(mechanisms); |
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245 else |
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246 (origin.log or log)("warn", "No SASL mechanisms to offer"); |
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247 end |
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248 else |
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249 features:tag("bind", bind_attr):tag("required"):up():up(); |
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250 features:tag("session", xmpp_session_attr):tag("optional"):up():up(); |
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251 end |
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252 end); |
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253 |
| 3651 | 254 module:hook("s2s-stream-features", function(event) |
| 255 local origin, features = event.origin, event.features; | |
| 256 if origin.secure and origin.type == "s2sin_unauthed" then | |
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257 -- Offer EXTERNAL only if both chain and identity is valid. |
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258 if origin.cert_chain_status == "valid" and origin.cert_identity_status == "valid" then |
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259 module:log("debug", "Offering SASL EXTERNAL"); |
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260 origin.external_auth = "offered" |
| 3651 | 261 features:tag("mechanisms", { xmlns = xmlns_sasl }) |
| 262 :tag("mechanism"):text("EXTERNAL") | |
| 263 :up():up(); | |
| 264 end | |
| 265 end | |
| 266 end); | |
| 267 | |
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268 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event) |
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269 local origin, stanza = event.origin, event.stanza; |
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270 local resource; |
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271 if stanza.attr.type == "set" then |
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272 local bind = stanza.tags[1]; |
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273 resource = bind:get_child("resource"); |
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274 resource = resource and #resource.tags == 0 and resource[1] or nil; |
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275 end |
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276 local success, err_type, err, err_msg = sm_bind_resource(origin, resource); |
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277 if success then |
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278 origin.send(st.reply(stanza) |
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279 :tag("bind", { xmlns = xmlns_bind }) |
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280 :tag("jid"):text(origin.full_jid)); |
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281 origin.log("debug", "Resource bound: %s", origin.full_jid); |
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282 else |
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283 origin.send(st.error_reply(stanza, err_type, err, err_msg)); |
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284 origin.log("debug", "Resource bind failed: %s", err_msg or err); |
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285 end |
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286 return true; |
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287 end); |
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288 |
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289 local function handle_legacy_session(event) |
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290 event.origin.send(st.reply(event.stanza)); |
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291 return true; |
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292 end |
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293 |
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294 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); |
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295 module:hook("iq/host/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); |
