X-Git-Url: https://git.enpas.org/?a=blobdiff_plain;f=plugins%2Fmod_saslauth.lua;h=4513c511d68d164070438aa05120f93b005e7972;hb=8bb2078fbc4e0db14429616a71d17dec966a749a;hp=abbf2ed449b2cfdcbab931c776734fd6f31803e5;hpb=2fdf1294838d4544484b47cc5be285f9be48ed1a;p=prosody.git diff --git a/plugins/mod_saslauth.lua b/plugins/mod_saslauth.lua index abbf2ed4..4513c511 100644 --- a/plugins/mod_saslauth.lua +++ b/plugins/mod_saslauth.lua @@ -1,7 +1,7 @@ -- Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 Waqas Hussain --- +-- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- @@ -13,28 +13,18 @@ local sm_bind_resource = require "core.sessionmanager".bind_resource; local sm_make_authenticated = require "core.sessionmanager".make_authenticated; local base64 = require "util.encodings".base64; -local nodeprep = require "util.encodings".stringprep.nodeprep; +local cert_verify_identity = require "util.x509".verify_identity; + local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler; -local t_concat, t_insert = table.concat, table.insert; local tostring = tostring; local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption"); -local anonymous_login = module:get_option("anonymous_login"); local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth") local log = module._log; local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl'; local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind'; -local xmlns_stanzas ='urn:ietf:params:xml:ns:xmpp-stanzas'; - -local new_sasl = require "util.sasl".new; - -local anonymous_authentication_profile = { - anonymous = function(username, realm) - return true; -- for normal usage you should always return true here - end -}; local function build_reply(status, ret, err_msg) local reply = st.stanza(status, {xmlns = xmlns_sasl}); @@ -55,16 +45,17 @@ end local function handle_status(session, status, ret, err_msg) if status == "failure" then + module:fire_event("authentication-failure", { session = session, condition = ret, text = err_msg }); session.sasl_handler = session.sasl_handler:clean_clone(); elseif status == "success" then - local username = nodeprep(session.sasl_handler.username); - local ok, err = sm_make_authenticated(session, session.sasl_handler.username); if ok then + module:fire_event("authentication-success", { session = session }); session.sasl_handler = nil; session:reset_stream(); else module:log("warn", "SASL succeeded but username was invalid"); + module:fire_event("authentication-failure", { session = session, condition = "not-authorized", text = err }); session.sasl_handler = session.sasl_handler:clean_clone(); return "failure", "not-authorized", "User authenticated successfully, but username was invalid"; end @@ -72,27 +63,7 @@ local function handle_status(session, status, ret, err_msg) return status, ret, err_msg; end -local function sasl_handler(session, stanza) - if stanza.name == "auth" then - -- FIXME ignoring duplicates because ejabberd does - local mechanism = stanza.attr.mechanism; - if anonymous_login then - if mechanism ~= "ANONYMOUS" then - return session.send(build_reply("failure", "invalid-mechanism")); - end - elseif mechanism == "ANONYMOUS" then - return session.send(build_reply("failure", "mechanism-too-weak")); - end - if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then - return session.send(build_reply("failure", "encryption-required")); - end - local valid_mechanism = session.sasl_handler:select(mechanism); - if not valid_mechanism then - return session.send(build_reply("failure", "invalid-mechanism")); - end - elseif not session.sasl_handler then - return; -- FIXME ignoring out of order stanzas because ejabberd does - end +local function sasl_process_cdata(session, stanza) local text = stanza[1]; if text then text = base64.decode(text); @@ -100,7 +71,7 @@ local function sasl_handler(session, stanza) if not text then session.sasl_handler = nil; session.send(build_reply("failure", "incorrect-encoding")); - return; + return true; end end local status, ret, err_msg = session.sasl_handler:process(text); @@ -108,11 +79,158 @@ local function sasl_handler(session, stanza) local s = build_reply(status, ret, err_msg); log("debug", "sasl reply: %s", tostring(s)); session.send(s); + return true; end -module:add_handler("c2s_unauthed", "auth", xmlns_sasl, sasl_handler); -module:add_handler("c2s_unauthed", "abort", xmlns_sasl, sasl_handler); -module:add_handler("c2s_unauthed", "response", xmlns_sasl, sasl_handler); +module:hook_stanza(xmlns_sasl, "success", function (session, stanza) + if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end + module:log("debug", "SASL EXTERNAL with %s succeeded", session.to_host); + session.external_auth = "succeeded" + session:reset_stream(); + session:open_stream(session.from_host, session.to_host); + + module:fire_event("s2s-authenticated", { session = session, host = session.to_host }); + return true; +end) + +module:hook_stanza(xmlns_sasl, "failure", function (session, stanza) + if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end + + module:log("info", "SASL EXTERNAL with %s failed", session.to_host) + -- TODO: Log the failure reason + session.external_auth = "failed" +end, 500) + +module:hook_stanza(xmlns_sasl, "failure", function (session, stanza) + -- TODO: Dialback wasn't loaded. Do something useful. +end, 90) + +module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza) + if session.type ~= "s2sout_unauthed" or not session.secure then return; end + + local mechanisms = stanza:get_child("mechanisms", xmlns_sasl) + if mechanisms then + for mech in mechanisms:childtags() do + if mech[1] == "EXTERNAL" then + module:log("debug", "Initiating SASL EXTERNAL with %s", session.to_host); + local reply = st.stanza("auth", {xmlns = xmlns_sasl, mechanism = "EXTERNAL"}); + reply:text(base64.encode(session.from_host)) + session.sends2s(reply) + session.external_auth = "attempting" + return true + end + end + end +end, 150); + +local function s2s_external_auth(session, stanza) + local mechanism = stanza.attr.mechanism; + + if not session.secure then + if mechanism == "EXTERNAL" then + session.sends2s(build_reply("failure", "encryption-required")) + else + session.sends2s(build_reply("failure", "invalid-mechanism")) + end + return true; + end + + if mechanism ~= "EXTERNAL" or session.cert_chain_status ~= "valid" then + session.sends2s(build_reply("failure", "invalid-mechanism")) + return true; + end + + local text = stanza[1] + if not text then + session.sends2s(build_reply("failure", "malformed-request")) + return true + end + + -- Either the value is "=" and we've already verified the external + -- cert identity, or the value is a string and either matches the + -- from_host ( + + text = base64.decode(text) + if not text then + session.sends2s(build_reply("failure", "incorrect-encoding")) + return true; + end + + if session.cert_identity_status == "valid" then + if text ~= "" and text ~= session.from_host then + session.sends2s(build_reply("failure", "invalid-authzid")) + return true + end + else + if text == "" then + session.sends2s(build_reply("failure", "invalid-authzid")) + return true + end + + local cert = session.conn:socket():getpeercertificate() + if (cert_verify_identity(text, "xmpp-server", cert)) then + session.cert_identity_status = "valid" + else + session.cert_identity_status = "invalid" + session.sends2s(build_reply("failure", "invalid-authzid")) + return true + end + end + + session.external_auth = "succeeded" + + if not session.from_host then + session.from_host = text; + end + session.sends2s(build_reply("success")) + + local domain = text ~= "" and text or session.from_host; + module:log("info", "Accepting SASL EXTERNAL identity from %s", domain); + module:fire_event("s2s-authenticated", { session = session, host = domain }); + session:reset_stream(); + return true +end + +module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function(event) + local session, stanza = event.origin, event.stanza; + if session.type == "s2sin_unauthed" then + return s2s_external_auth(session, stanza) + end + + if session.type ~= "c2s_unauthed" then return; end + + if session.sasl_handler and session.sasl_handler.selected then + session.sasl_handler = nil; -- allow starting a new SASL negotiation before completing an old one + end + if not session.sasl_handler then + session.sasl_handler = usermanager_get_sasl_handler(module.host, session); + end + local mechanism = stanza.attr.mechanism; + if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then + session.send(build_reply("failure", "encryption-required")); + return true; + end + local valid_mechanism = session.sasl_handler:select(mechanism); + if not valid_mechanism then + session.send(build_reply("failure", "invalid-mechanism")); + return true; + end + return sasl_process_cdata(session, stanza); +end); +module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:response", function(event) + local session = event.origin; + if not(session.sasl_handler and session.sasl_handler.selected) then + session.send(build_reply("failure", "not-authorized", "Out of order SASL element")); + return true; + end + return sasl_process_cdata(session, event.stanza); +end); +module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:abort", function(event) + local session = event.origin; + session.sasl_handler = nil; + session.send(build_reply("failure", "aborted")); + return true; +end); local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' }; local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' }; @@ -123,24 +241,44 @@ module:hook("stream-features", function(event) if secure_auth_only and not origin.secure then return; end - if anonymous_login then - origin.sasl_handler = new_sasl(module.host, anonymous_authentication_profile); - else - origin.sasl_handler = usermanager_get_sasl_handler(module.host); + origin.sasl_handler = usermanager_get_sasl_handler(module.host, origin); + if origin.encrypted then + -- check wether LuaSec has the nifty binding to the function needed for tls-unique + -- FIXME: would be nice to have this check only once and not for every socket + if origin.conn:socket().getpeerfinished then + origin.sasl_handler:add_cb_handler("tls-unique", function(self) + return self.userdata:getpeerfinished(); + end); + origin.sasl_handler["userdata"] = origin.conn:socket(); + end end - features:tag("mechanisms", mechanisms_attr); + local mechanisms = st.stanza("mechanisms", mechanisms_attr); for mechanism in pairs(origin.sasl_handler:mechanisms()) do if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then - features:tag("mechanism"):text(mechanism):up(); + mechanisms:tag("mechanism"):text(mechanism):up(); end end - features:up(); + if mechanisms[1] then features:add_child(mechanisms); end else features:tag("bind", bind_attr):tag("required"):up():up(); features:tag("session", xmpp_session_attr):tag("optional"):up():up(); end end); +module:hook("s2s-stream-features", function(event) + local origin, features = event.origin, event.features; + if origin.secure and origin.type == "s2sin_unauthed" then + -- Offer EXTERNAL if chain is valid and either we didn't validate + -- the identity or it passed. + if origin.cert_chain_status == "valid" and origin.cert_identity_status ~= "invalid" then --TODO: Configurable + module:log("debug", "Offering SASL EXTERNAL") + features:tag("mechanisms", { xmlns = xmlns_sasl }) + :tag("mechanism"):text("EXTERNAL") + :up():up(); + end + end +end); + module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event) local origin, stanza = event.origin, event.stanza; local resource; @@ -162,7 +300,10 @@ module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event) return true; end); -module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", function(event) +local function handle_legacy_session(event) event.origin.send(st.reply(event.stanza)); return true; -end); +end + +module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session); +module:hook("iq/host/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session);