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plugins/mod_saslauth.lua @ 7939:6940d6db970b
mod_saslauth: Log SASL failure reason
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Thu, 02 Mar 2017 15:17:32 +0100 |
| parent | 6033:0d6f23049e95 |
| child | 7940:e520dc0c3af4 |
| child | 8222:67a9d2de2300 |
| 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 cert_verify_identity = require "util.x509".verify_identity; |
| 3651 | 17 |
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18 local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler; |
| 38 | 19 local tostring = tostring; |
| 20 | |
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21 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption"); |
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22 local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth") |
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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 == "challenge" then |
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32 --log("debug", "CHALLENGE: %s", ret or ""); |
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33 reply:text(base64.encode(ret or "")); |
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34 elseif status == "failure" then |
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35 reply:tag(ret):up(); |
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36 if err_msg then reply:tag("text"):text(err_msg); end |
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37 elseif status == "success" then |
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38 --log("debug", "SUCCESS: %s", ret or ""); |
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39 reply:text(base64.encode(ret or "")); |
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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 | |
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99 local text = stanza:get_child_text("text"); |
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100 local condition = "unknown-condition"; |
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101 for child in stanza:childtags() do |
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102 if child.name ~= "text" then |
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103 condition = child.name; |
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104 break; |
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105 end |
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106 end |
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107 if text and condition then |
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108 condition = connection .. ": " .. text; |
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109 end |
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110 module:log("info", "SASL EXTERNAL with %s failed: %s", session.to_host, condition); |
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111 |
| 3651 | 112 session.external_auth = "failed" |
| 113 end, 500) | |
| 114 | |
| 115 module:hook_stanza(xmlns_sasl, "failure", function (session, stanza) | |
| 116 -- TODO: Dialback wasn't loaded. Do something useful. | |
| 117 end, 90) | |
| 118 | |
| 119 module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza) | |
| 120 if session.type ~= "s2sout_unauthed" or not session.secure then return; end | |
| 121 | |
| 122 local mechanisms = stanza:get_child("mechanisms", xmlns_sasl) | |
| 123 if mechanisms then | |
| 124 for mech in mechanisms:childtags() do | |
| 125 if mech[1] == "EXTERNAL" then | |
| 126 module:log("debug", "Initiating SASL EXTERNAL with %s", session.to_host); | |
| 127 local reply = st.stanza("auth", {xmlns = xmlns_sasl, mechanism = "EXTERNAL"}); | |
| 128 reply:text(base64.encode(session.from_host)) | |
| 129 session.sends2s(reply) | |
| 130 session.external_auth = "attempting" | |
| 131 return true | |
| 132 end | |
| 133 end | |
| 134 end | |
| 135 end, 150); | |
| 136 | |
| 137 local function s2s_external_auth(session, stanza) | |
| 138 local mechanism = stanza.attr.mechanism; | |
| 139 | |
| 140 if not session.secure then | |
| 141 if mechanism == "EXTERNAL" then | |
| 142 session.sends2s(build_reply("failure", "encryption-required")) | |
| 143 else | |
| 144 session.sends2s(build_reply("failure", "invalid-mechanism")) | |
| 145 end | |
| 146 return true; | |
| 147 end | |
| 148 | |
| 149 if mechanism ~= "EXTERNAL" or session.cert_chain_status ~= "valid" then | |
| 150 session.sends2s(build_reply("failure", "invalid-mechanism")) | |
| 151 return true; | |
| 152 end | |
| 153 | |
| 154 local text = stanza[1] | |
| 155 if not text then | |
| 156 session.sends2s(build_reply("failure", "malformed-request")) | |
| 157 return true | |
| 158 end | |
| 159 | |
| 160 -- Either the value is "=" and we've already verified the external | |
| 161 -- cert identity, or the value is a string and either matches the | |
| 162 -- from_host ( | |
| 163 | |
| 164 text = base64.decode(text) | |
| 165 if not text then | |
| 166 session.sends2s(build_reply("failure", "incorrect-encoding")) | |
| 167 return true; | |
| 168 end | |
| 169 | |
| 170 if session.cert_identity_status == "valid" then | |
| 171 if text ~= "" and text ~= session.from_host then | |
| 172 session.sends2s(build_reply("failure", "invalid-authzid")) | |
| 173 return true | |
| 174 end | |
| 175 else | |
| 176 if text == "" then | |
| 177 session.sends2s(build_reply("failure", "invalid-authzid")) | |
| 178 return true | |
| 179 end | |
| 180 | |
| 181 local cert = session.conn:socket():getpeercertificate() | |
| 182 if (cert_verify_identity(text, "xmpp-server", cert)) then | |
| 183 session.cert_identity_status = "valid" | |
| 184 else | |
| 185 session.cert_identity_status = "invalid" | |
| 186 session.sends2s(build_reply("failure", "invalid-authzid")) | |
| 187 return true | |
| 188 end | |
| 189 end | |
| 190 | |
| 191 session.external_auth = "succeeded" | |
| 192 | |
| 193 if not session.from_host then | |
| 194 session.from_host = text; | |
| 195 end | |
| 196 session.sends2s(build_reply("success")) | |
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197 |
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198 local domain = text ~= "" and text or session.from_host; |
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199 module:log("info", "Accepting SASL EXTERNAL identity from %s", domain); |
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200 module:fire_event("s2s-authenticated", { session = session, host = domain }); |
| 3651 | 201 session:reset_stream(); |
| 202 return true | |
| 203 end | |
| 204 | |
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205 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function(event) |
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206 local session, stanza = event.origin, event.stanza; |
| 3651 | 207 if session.type == "s2sin_unauthed" then |
| 208 return s2s_external_auth(session, stanza) | |
| 209 end | |
| 210 | |
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211 if session.type ~= "c2s_unauthed" or module:get_host_type() ~= "local" then return; end |
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212 |
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213 if session.sasl_handler and session.sasl_handler.selected then |
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214 session.sasl_handler = nil; -- allow starting a new SASL negotiation before completing an old one |
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215 end |
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216 if not session.sasl_handler then |
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217 session.sasl_handler = usermanager_get_sasl_handler(module.host, session); |
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218 end |
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219 local mechanism = stanza.attr.mechanism; |
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220 if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then |
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221 session.send(build_reply("failure", "encryption-required")); |
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222 return true; |
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223 end |
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224 local valid_mechanism = session.sasl_handler:select(mechanism); |
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225 if not valid_mechanism then |
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226 session.send(build_reply("failure", "invalid-mechanism")); |
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227 return true; |
|
295
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228 end |
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229 return sasl_process_cdata(session, stanza); |
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230 end); |
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231 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:response", function(event) |
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232 local session = event.origin; |
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233 if not(session.sasl_handler and session.sasl_handler.selected) then |
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234 session.send(build_reply("failure", "not-authorized", "Out of order SASL element")); |
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235 return true; |
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236 end |
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237 return sasl_process_cdata(session, event.stanza); |
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238 end); |
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239 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:abort", function(event) |
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240 local session = event.origin; |
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241 session.sasl_handler = nil; |
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242 session.send(build_reply("failure", "aborted")); |
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243 return true; |
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244 end); |
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245 |
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246 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' }; |
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247 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' }; |
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248 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' }; |
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249 module:hook("stream-features", function(event) |
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250 local origin, features = event.origin, event.features; |
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251 if not origin.username then |
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252 if secure_auth_only and not origin.secure then |
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253 return; |
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254 end |
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255 origin.sasl_handler = usermanager_get_sasl_handler(module.host, origin); |
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256 local mechanisms = st.stanza("mechanisms", mechanisms_attr); |
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257 for mechanism in pairs(origin.sasl_handler:mechanisms()) do |
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258 if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then |
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259 mechanisms:tag("mechanism"):text(mechanism):up(); |
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260 end |
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261 end |
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262 if mechanisms[1] then features:add_child(mechanisms); end |
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263 else |
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264 features:tag("bind", bind_attr):tag("required"):up():up(); |
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265 features:tag("session", xmpp_session_attr):tag("optional"):up():up(); |
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266 end |
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267 end); |
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268 |
| 3651 | 269 module:hook("s2s-stream-features", function(event) |
| 270 local origin, features = event.origin, event.features; | |
| 271 if origin.secure and origin.type == "s2sin_unauthed" then | |
| 272 -- Offer EXTERNAL if chain is valid and either we didn't validate | |
| 273 -- the identity or it passed. | |
| 274 if origin.cert_chain_status == "valid" and origin.cert_identity_status ~= "invalid" then --TODO: Configurable | |
| 275 module:log("debug", "Offering SASL EXTERNAL") | |
| 276 features:tag("mechanisms", { xmlns = xmlns_sasl }) | |
| 277 :tag("mechanism"):text("EXTERNAL") | |
| 278 :up():up(); | |
| 279 end | |
| 280 end | |
| 281 end); | |
| 282 | |
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283 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event) |
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284 local origin, stanza = event.origin, event.stanza; |
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285 local resource; |
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286 if stanza.attr.type == "set" then |
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287 local bind = stanza.tags[1]; |
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288 resource = bind:child_with_name("resource"); |
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289 resource = resource and #resource.tags == 0 and resource[1] or nil; |
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290 end |
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291 local success, err_type, err, err_msg = sm_bind_resource(origin, resource); |
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292 if success then |
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293 origin.send(st.reply(stanza) |
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294 :tag("bind", { xmlns = xmlns_bind }) |
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295 :tag("jid"):text(origin.full_jid)); |
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296 origin.log("debug", "Resource bound: %s", origin.full_jid); |
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297 else |
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298 origin.send(st.error_reply(stanza, err_type, err, err_msg)); |
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299 origin.log("debug", "Resource bind failed: %s", err_msg or err); |
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300 end |
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301 return true; |
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302 end); |
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303 |
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304 local function handle_legacy_session(event) |
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305 event.origin.send(st.reply(event.stanza)); |
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306 return true; |
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307 end |
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308 |
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309 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); |
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310 module:hook("iq/host/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); |
