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plugins/mod_saslauth.lua @ 8511:dd7b8888636e
mod_saslauth: Pass SASL EXTERNAL failure reason on to be used in error bounces
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Sun, 04 Feb 2018 01:01:50 +0100 |
| parent | 8510:149e98f88680 |
| child | 8512:e924a99fd435 |
| 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 -- luacheck: ignore 431/log |
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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("insecure_sasl_mechanisms", allow_unencrypted_plain_auth and {} or {"PLAIN", "LOGIN"}); |
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22 local disabled_mechanisms = module:get_option_set("disable_sasl_mechanisms", { "DIGEST-MD5" }); |
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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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mod_saslauth: Remove 2 instances of raising errors and replacing with more graceful handling
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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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mod_saslauth: Fire authentication-success and authentication-failure events (thanks scitor)
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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 |
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85 module:hook_tag(xmlns_sasl, "success", function (session) |
| 3651 | 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 | |
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96 module:hook_tag(xmlns_sasl, "failure", function (session, stanza) |
| 3651 | 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 = condition .. ": " .. 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" |
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113 session.external_auth_failure_reason = condition; |
| 3651 | 114 end, 500) |
| 115 | |
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116 module:hook_stanza(xmlns_sasl, "failure", function (session, stanza) |
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117 session.log("debug", "No fallback from SASL EXTERNAL failure, giving up"); |
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118 session:close(nil, session.external_auth_failure_reason); |
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119 return true; |
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120 end, 90) |
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121 |
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122 module:hook_tag("http://etherx.jabber.org/streams", "features", function (session, stanza) |
| 3651 | 123 if session.type ~= "s2sout_unauthed" or not session.secure then return; end |
| 124 | |
| 125 local mechanisms = stanza:get_child("mechanisms", xmlns_sasl) | |
| 126 if mechanisms then | |
| 127 for mech in mechanisms:childtags() do | |
| 128 if mech[1] == "EXTERNAL" then | |
| 129 module:log("debug", "Initiating SASL EXTERNAL with %s", session.to_host); | |
| 130 local reply = st.stanza("auth", {xmlns = xmlns_sasl, mechanism = "EXTERNAL"}); | |
| 131 reply:text(base64.encode(session.from_host)) | |
| 132 session.sends2s(reply) | |
| 133 session.external_auth = "attempting" | |
| 134 return true | |
| 135 end | |
| 136 end | |
| 137 end | |
| 138 end, 150); | |
| 139 | |
| 140 local function s2s_external_auth(session, stanza) | |
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141 if session.external_auth ~= "offered" then return end -- Unexpected request |
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142 |
| 3651 | 143 local mechanism = stanza.attr.mechanism; |
| 144 | |
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145 if mechanism ~= "EXTERNAL" then |
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146 session.sends2s(build_reply("failure", "invalid-mechanism")); |
| 3651 | 147 return true; |
| 148 end | |
| 149 | |
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150 if not session.secure then |
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151 session.sends2s(build_reply("failure", "encryption-required")); |
| 3651 | 152 return true; |
| 153 end | |
| 154 | |
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155 local text = stanza[1]; |
| 3651 | 156 if not text then |
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157 session.sends2s(build_reply("failure", "malformed-request")); |
| 3651 | 158 return true; |
| 159 end | |
| 160 | |
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161 text = base64.decode(text); |
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162 if not text then |
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163 session.sends2s(build_reply("failure", "incorrect-encoding")); |
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164 return true; |
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165 end |
| 3651 | 166 |
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167 -- The text value is either "" or equals session.from_host |
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168 if not ( text == "" or text == session.from_host ) then |
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169 session.sends2s(build_reply("failure", "invalid-authzid")); |
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170 return true; |
| 3651 | 171 end |
| 172 | |
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173 -- We've already verified the external cert identity before offering EXTERNAL |
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174 if session.cert_chain_status ~= "valid" or session.cert_identity_status ~= "valid" then |
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175 session.sends2s(build_reply("failure", "not-authorized")); |
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176 session:close(); |
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177 return true; |
| 3651 | 178 end |
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179 |
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180 -- Success! |
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181 session.external_auth = "succeeded"; |
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182 session.sends2s(build_reply("success")); |
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183 module:log("info", "Accepting SASL EXTERNAL identity from %s", session.from_host); |
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184 module:fire_event("s2s-authenticated", { session = session, host = session.from_host }); |
| 3651 | 185 session:reset_stream(); |
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186 return true; |
| 3651 | 187 end |
| 188 | |
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189 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function(event) |
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190 local session, stanza = event.origin, event.stanza; |
| 3651 | 191 if session.type == "s2sin_unauthed" then |
| 192 return s2s_external_auth(session, stanza) | |
| 193 end | |
| 194 | |
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195 if session.type ~= "c2s_unauthed" or module:get_host_type() ~= "local" then return; end |
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196 |
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197 if session.sasl_handler and session.sasl_handler.selected then |
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198 session.sasl_handler = nil; -- allow starting a new SASL negotiation before completing an old one |
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199 end |
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200 if not session.sasl_handler then |
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201 session.sasl_handler = usermanager_get_sasl_handler(module.host, session); |
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202 end |
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203 local mechanism = stanza.attr.mechanism; |
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204 if not session.secure and (secure_auth_only or insecure_mechanisms:contains(mechanism)) then |
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205 session.send(build_reply("failure", "encryption-required")); |
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206 return true; |
|
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207 elseif disabled_mechanisms:contains(mechanism) then |
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208 session.send(build_reply("failure", "invalid-mechanism")); |
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209 return true; |
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210 end |
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211 local valid_mechanism = session.sasl_handler:select(mechanism); |
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212 if not valid_mechanism then |
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213 session.send(build_reply("failure", "invalid-mechanism")); |
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214 return true; |
|
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215 end |
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216 return sasl_process_cdata(session, stanza); |
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217 end); |
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218 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:response", function(event) |
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219 local session = event.origin; |
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220 if not(session.sasl_handler and session.sasl_handler.selected) then |
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221 session.send(build_reply("failure", "not-authorized", "Out of order SASL element")); |
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222 return true; |
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223 end |
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224 return sasl_process_cdata(session, event.stanza); |
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225 end); |
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226 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:abort", function(event) |
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227 local session = event.origin; |
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228 session.sasl_handler = nil; |
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229 session.send(build_reply("failure", "aborted")); |
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230 return true; |
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231 end); |
|
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232 |
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233 local function tls_unique(self) |
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234 return self.userdata["tls-unique"]:getpeerfinished(); |
|
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235 end |
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236 |
|
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237 local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' }; |
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238 local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' }; |
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239 local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' }; |
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240 module:hook("stream-features", function(event) |
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241 local origin, features = event.origin, event.features; |
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242 local log = origin.log or log; |
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243 if not origin.username then |
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244 if secure_auth_only and not origin.secure then |
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245 log("debug", "Not offering authentication on insecure connection"); |
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246 return; |
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247 end |
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248 local sasl_handler = usermanager_get_sasl_handler(module.host, origin) |
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249 origin.sasl_handler = sasl_handler; |
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250 if origin.encrypted then |
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251 -- check wether LuaSec has the nifty binding to the function needed for tls-unique |
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252 -- FIXME: would be nice to have this check only once and not for every socket |
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253 if sasl_handler.add_cb_handler then |
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254 local socket = origin.conn:socket(); |
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255 if socket.getpeerfinished then |
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256 sasl_handler:add_cb_handler("tls-unique", tls_unique); |
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257 end |
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258 sasl_handler["userdata"] = { |
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259 ["tls-unique"] = socket; |
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260 }; |
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261 end |
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262 end |
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263 local mechanisms = st.stanza("mechanisms", mechanisms_attr); |
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264 local sasl_mechanisms = sasl_handler:mechanisms() |
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265 for mechanism in pairs(sasl_mechanisms) do |
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266 if disabled_mechanisms:contains(mechanism) then |
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267 log("debug", "Not offering disabled mechanism %s", mechanism); |
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268 elseif not origin.secure and insecure_mechanisms:contains(mechanism) then |
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269 log("debug", "Not offering mechanism %s on insecure connection", mechanism); |
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270 else |
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271 log("debug", "Offering mechanism %s", mechanism); |
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272 mechanisms:tag("mechanism"):text(mechanism):up(); |
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273 end |
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274 end |
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275 if mechanisms[1] then |
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276 features:add_child(mechanisms); |
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277 elseif not next(sasl_mechanisms) then |
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278 log("warn", "No available SASL mechanisms, verify that the configured authentication module is working"); |
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279 else |
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280 log("warn", "All available authentication mechanisms are either disabled or not suitable for an insecure connection"); |
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281 end |
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282 else |
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283 features:tag("bind", bind_attr):tag("required"):up():up(); |
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284 features:tag("session", xmpp_session_attr):tag("optional"):up():up(); |
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285 end |
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286 end); |
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287 |
| 3651 | 288 module:hook("s2s-stream-features", function(event) |
| 289 local origin, features = event.origin, event.features; | |
| 290 if origin.secure and origin.type == "s2sin_unauthed" then | |
|
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291 -- Offer EXTERNAL only if both chain and identity is valid. |
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292 if origin.cert_chain_status == "valid" and origin.cert_identity_status == "valid" then |
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293 module:log("debug", "Offering SASL EXTERNAL"); |
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294 origin.external_auth = "offered" |
| 3651 | 295 features:tag("mechanisms", { xmlns = xmlns_sasl }) |
| 296 :tag("mechanism"):text("EXTERNAL") | |
| 297 :up():up(); | |
| 298 end | |
| 299 end | |
| 300 end); | |
| 301 | |
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302 module:hook("stanza/iq/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event) |
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303 local origin, stanza = event.origin, event.stanza; |
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304 local resource; |
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305 if stanza.attr.type == "set" then |
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306 local bind = stanza.tags[1]; |
|
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307 resource = bind:get_child("resource"); |
|
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308 resource = resource and #resource.tags == 0 and resource[1] or nil; |
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309 end |
|
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310 local success, err_type, err, err_msg = sm_bind_resource(origin, resource); |
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311 if success then |
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312 origin.send(st.reply(stanza) |
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313 :tag("bind", { xmlns = xmlns_bind }) |
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314 :tag("jid"):text(origin.full_jid)); |
|
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315 origin.log("debug", "Resource bound: %s", origin.full_jid); |
|
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316 else |
|
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317 origin.send(st.error_reply(stanza, err_type, err, err_msg)); |
|
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diff
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318 origin.log("debug", "Resource bind failed: %s", err_msg or err); |
|
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319 end |
|
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320 return true; |
|
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321 end); |
|
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322 |
|
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323 local function handle_legacy_session(event) |
|
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324 event.origin.send(st.reply(event.stanza)); |
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325 return true; |
|
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326 end |
|
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327 |
|
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328 module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); |
|
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329 module:hook("iq/host/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); |
