Software / code / prosody
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plugins/mod_saslauth.lua @ 3962:c77eff3ac5e1
configure: Don't add -llua to LDFLAGS, it's unnecessary
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Sun, 26 Dec 2010 05:00:45 +0000 |
| parent | 3961:94d9fb07c49c |
| child | 3981:2b0b8fe68df2 |
| 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; |
| 3651 | 14 local s2s_make_authenticated = require "core.s2smanager".make_authenticated; |
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15 local base64 = require "util.encodings".base64; |
| 38 | 16 |
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17 local cert_verify_identity = require "util.x509".verify_identity; |
| 3651 | 18 |
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19 local nodeprep = require "util.encodings".stringprep.nodeprep; |
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20 local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler; |
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21 local t_concat, t_insert = table.concat, table.insert; |
| 38 | 22 local tostring = tostring; |
| 23 | |
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24 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption"); |
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25 local anonymous_login = module:get_option("anonymous_login"); |
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26 local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth") |
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27 |
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28 local log = module._log; |
| 38 | 29 |
| 30 local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl'; | |
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31 local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind'; |
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32 local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas'; |
| 38 | 33 |
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34 local new_sasl = require "util.sasl".new; |
| 38 | 35 |
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36 local anonymous_authentication_profile = { |
| 2193 | 37 anonymous = function(username, realm) |
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38 return true; -- for normal usage you should always return true here |
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39 end |
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40 }; |
| 38 | 41 |
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42 local function build_reply(status, ret, err_msg) |
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43 local reply = st.stanza(status, {xmlns = xmlns_sasl}); |
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44 if status == "challenge" then |
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45 --log("debug", "CHALLENGE: %s", ret or ""); |
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46 reply:text(base64.encode(ret or "")); |
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47 elseif status == "failure" then |
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48 reply:tag(ret):up(); |
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49 if err_msg then reply:tag("text"):text(err_msg); end |
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50 elseif status == "success" then |
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51 --log("debug", "SUCCESS: %s", ret or ""); |
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52 reply:text(base64.encode(ret or "")); |
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53 else |
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54 module:log("error", "Unknown sasl status: %s", status); |
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55 end |
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56 return reply; |
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57 end |
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58 |
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59 local function handle_status(session, status, ret, err_msg) |
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60 if status == "failure" then |
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61 session.sasl_handler = session.sasl_handler:clean_clone(); |
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62 elseif status == "success" then |
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63 local username = nodeprep(session.sasl_handler.username); |
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64 |
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65 local ok, err = sm_make_authenticated(session, session.sasl_handler.username); |
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66 if ok then |
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67 session.sasl_handler = nil; |
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68 session:reset_stream(); |
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69 else |
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70 module:log("warn", "SASL succeeded but username was invalid"); |
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71 session.sasl_handler = session.sasl_handler:clean_clone(); |
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72 return "failure", "not-authorized", "User authenticated successfully, but username was invalid"; |
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73 end |
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74 end |
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75 return status, ret, err_msg; |
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76 end |
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77 |
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78 local function sasl_process_cdata(session, stanza) |
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79 local text = stanza[1]; |
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80 if text then |
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81 text = base64.decode(text); |
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82 --log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " ")); |
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83 if not text then |
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84 session.sasl_handler = nil; |
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85 session.send(build_reply("failure", "incorrect-encoding")); |
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86 return true; |
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87 end |
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88 end |
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89 local status, ret, err_msg = session.sasl_handler:process(text); |
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90 status, ret, err_msg = handle_status(session, status, ret, err_msg); |
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91 local s = build_reply(status, ret, err_msg); |
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92 log("debug", "sasl reply: %s", tostring(s)); |
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93 session.send(s); |
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94 return true; |
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95 end |
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96 |
| 3651 | 97 module:hook_stanza(xmlns_sasl, "success", function (session, stanza) |
| 98 if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end | |
| 99 module:log("debug", "SASL EXTERNAL with %s succeeded", session.to_host); | |
| 100 session.external_auth = "succeeded" | |
| 101 session:reset_stream(); | |
| 102 | |
| 103 local default_stream_attr = {xmlns = "jabber:server", ["xmlns:stream"] = "http://etherx.jabber.org/streams", | |
| 104 ["xmlns:db"] = 'jabber:server:dialback', version = "1.0", to = session.to_host, from = session.from_host}; | |
| 105 session.sends2s("<?xml version='1.0'?>"); | |
| 106 session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag()); | |
| 107 | |
| 108 s2s_make_authenticated(session, session.to_host); | |
| 109 return true; | |
| 110 end) | |
| 111 | |
| 112 module:hook_stanza(xmlns_sasl, "failure", function (session, stanza) | |
| 113 if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end | |
| 114 | |
| 115 module:log("info", "SASL EXTERNAL with %s failed", session.to_host) | |
| 116 -- TODO: Log the failure reason | |
| 117 session.external_auth = "failed" | |
| 118 end, 500) | |
| 119 | |
| 120 module:hook_stanza(xmlns_sasl, "failure", function (session, stanza) | |
| 121 -- TODO: Dialback wasn't loaded. Do something useful. | |
| 122 end, 90) | |
| 123 | |
| 124 module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza) | |
| 125 if session.type ~= "s2sout_unauthed" or not session.secure then return; end | |
| 126 | |
| 127 local mechanisms = stanza:get_child("mechanisms", xmlns_sasl) | |
| 128 if mechanisms then | |
| 129 for mech in mechanisms:childtags() do | |
| 130 if mech[1] == "EXTERNAL" then | |
| 131 module:log("debug", "Initiating SASL EXTERNAL with %s", session.to_host); | |
| 132 local reply = st.stanza("auth", {xmlns = xmlns_sasl, mechanism = "EXTERNAL"}); | |
| 133 reply:text(base64.encode(session.from_host)) | |
| 134 session.sends2s(reply) | |
| 135 session.external_auth = "attempting" | |
| 136 return true | |
| 137 end | |
| 138 end | |
| 139 end | |
| 140 end, 150); | |
| 141 | |
| 142 local function s2s_external_auth(session, stanza) | |
| 143 local mechanism = stanza.attr.mechanism; | |
| 144 | |
| 145 if not session.secure then | |
| 146 if mechanism == "EXTERNAL" then | |
| 147 session.sends2s(build_reply("failure", "encryption-required")) | |
| 148 else | |
| 149 session.sends2s(build_reply("failure", "invalid-mechanism")) | |
| 150 end | |
| 151 return true; | |
| 152 end | |
| 153 | |
| 154 if mechanism ~= "EXTERNAL" or session.cert_chain_status ~= "valid" then | |
| 155 session.sends2s(build_reply("failure", "invalid-mechanism")) | |
| 156 return true; | |
| 157 end | |
| 158 | |
| 159 local text = stanza[1] | |
| 160 if not text then | |
| 161 session.sends2s(build_reply("failure", "malformed-request")) | |
| 162 return true | |
| 163 end | |
| 164 | |
| 165 -- Either the value is "=" and we've already verified the external | |
| 166 -- cert identity, or the value is a string and either matches the | |
| 167 -- from_host ( | |
| 168 | |
| 169 text = base64.decode(text) | |
| 170 if not text then | |
| 171 session.sends2s(build_reply("failure", "incorrect-encoding")) | |
| 172 return true; | |
| 173 end | |
| 174 | |
| 175 if session.cert_identity_status == "valid" then | |
| 176 if text ~= "" and text ~= session.from_host then | |
| 177 session.sends2s(build_reply("failure", "invalid-authzid")) | |
| 178 return true | |
| 179 end | |
| 180 else | |
| 181 if text == "" then | |
| 182 session.sends2s(build_reply("failure", "invalid-authzid")) | |
| 183 return true | |
| 184 end | |
| 185 | |
| 186 local cert = session.conn:socket():getpeercertificate() | |
| 187 if (cert_verify_identity(text, "xmpp-server", cert)) then | |
| 188 session.cert_identity_status = "valid" | |
| 189 else | |
| 190 session.cert_identity_status = "invalid" | |
| 191 session.sends2s(build_reply("failure", "invalid-authzid")) | |
| 192 return true | |
| 193 end | |
| 194 end | |
| 195 | |
| 196 session.external_auth = "succeeded" | |
| 197 | |
| 198 if not session.from_host then | |
| 199 session.from_host = text; | |
| 200 end | |
| 201 session.sends2s(build_reply("success")) | |
| 202 module:log("info", "Accepting SASL EXTERNAL identity from %s", text or session.from_host); | |
| 203 s2s_make_authenticated(session, text or session.from_host) | |
| 204 session:reset_stream(); | |
| 205 return true | |
| 206 end | |
| 207 | |
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208 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function(event) |
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209 local session, stanza = event.origin, event.stanza; |
| 3651 | 210 if session.type == "s2sin_unauthed" then |
| 211 return s2s_external_auth(session, stanza) | |
| 212 end | |
| 213 | |
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214 if session.type ~= "c2s_unauthed" then return; end |
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215 |
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216 if session.sasl_handler and session.sasl_handler.selected then |
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217 session.sasl_handler = nil; -- allow starting a new SASL negotiation before completing an old one |
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218 end |
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219 if not session.sasl_handler then |
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220 if anonymous_login then |
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221 session.sasl_handler = new_sasl(module.host, anonymous_authentication_profile); |
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222 else |
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223 session.sasl_handler = usermanager_get_sasl_handler(module.host); |
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224 end |
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225 end |
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226 local mechanism = stanza.attr.mechanism; |
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227 if anonymous_login then |
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228 if mechanism ~= "ANONYMOUS" then |
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229 session.send(build_reply("failure", "invalid-mechanism")); |
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230 return true; |
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231 end |
|
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232 elseif mechanism == "ANONYMOUS" then |
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233 session.send(build_reply("failure", "mechanism-too-weak")); |
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234 return true; |
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235 end |
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236 if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then |
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237 session.send(build_reply("failure", "encryption-required")); |
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238 return true; |
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239 end |
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240 local valid_mechanism = session.sasl_handler:select(mechanism); |
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241 if not valid_mechanism then |
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242 session.send(build_reply("failure", "invalid-mechanism")); |
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243 return true; |
|
295
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244 end |
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245 return sasl_process_cdata(session, stanza); |
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246 end); |
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247 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:response", function(event) |
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248 local session = event.origin; |
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249 if not(session.sasl_handler and session.sasl_handler.selected) then |
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250 session.send(build_reply("failure", "not-authorized", "Out of order SASL element")); |
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251 return true; |
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252 end |
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253 return sasl_process_cdata(session, event.stanza); |
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254 end); |
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255 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:abort", function(event) |
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256 local session = event.origin; |
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257 session.sasl_handler = nil; |
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258 session.send(build_reply("failure", "aborted")); |
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259 return true; |
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260 end); |
|
284
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261 |
|
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262 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' }; |
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263 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' }; |
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264 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' }; |
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265 module:hook("stream-features", function(event) |
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266 local origin, features = event.origin, event.features; |
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267 if not origin.username then |
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268 if secure_auth_only and not origin.secure then |
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269 return; |
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270 end |
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271 if anonymous_login then |
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272 origin.sasl_handler = new_sasl(module.host, anonymous_authentication_profile); |
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273 else |
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274 origin.sasl_handler = usermanager_get_sasl_handler(module.host); |
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275 end |
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276 features:tag("mechanisms", mechanisms_attr); |
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277 for mechanism in pairs(origin.sasl_handler:mechanisms()) do |
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278 if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then |
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279 features:tag("mechanism"):text(mechanism):up(); |
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280 end |
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281 end |
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282 features:up(); |
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283 else |
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284 features:tag("bind", bind_attr):tag("required"):up():up(); |
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285 features:tag("session", xmpp_session_attr):tag("optional"):up():up(); |
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286 end |
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287 end); |
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288 |
| 3651 | 289 module:hook("s2s-stream-features", function(event) |
| 290 local origin, features = event.origin, event.features; | |
| 291 if origin.secure and origin.type == "s2sin_unauthed" then | |
| 292 -- Offer EXTERNAL if chain is valid and either we didn't validate | |
| 293 -- the identity or it passed. | |
| 294 if origin.cert_chain_status == "valid" and origin.cert_identity_status ~= "invalid" then --TODO: Configurable | |
| 295 module:log("debug", "Offering SASL EXTERNAL") | |
| 296 features:tag("mechanisms", { xmlns = xmlns_sasl }) | |
| 297 :tag("mechanism"):text("EXTERNAL") | |
| 298 :up():up(); | |
| 299 end | |
| 300 end | |
| 301 end); | |
| 302 | |
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303 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event) |
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304 local origin, stanza = event.origin, event.stanza; |
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305 local resource; |
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306 if stanza.attr.type == "set" then |
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307 local bind = stanza.tags[1]; |
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308 resource = bind:child_with_name("resource"); |
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309 resource = resource and #resource.tags == 0 and resource[1] or nil; |
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310 end |
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311 local success, err_type, err, err_msg = sm_bind_resource(origin, resource); |
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312 if success then |
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313 origin.send(st.reply(stanza) |
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314 :tag("bind", { xmlns = xmlns_bind }) |
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315 :tag("jid"):text(origin.full_jid)); |
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316 origin.log("debug", "Resource bound: %s", origin.full_jid); |
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317 else |
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318 origin.send(st.error_reply(stanza, err_type, err, err_msg)); |
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319 origin.log("debug", "Resource bind failed: %s", err_msg or err); |
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320 end |
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321 return true; |
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322 end); |
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323 |
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324 local function handle_legacy_session(event) |
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325 event.origin.send(st.reply(event.stanza)); |
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326 return true; |
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327 end |
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328 |
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329 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); |
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330 module:hook("iq/host/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); |
