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304 lines
11 KiB
304 lines
11 KiB
-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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local st = require "util.stanza";
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local sm_bind_resource = require "core.sessionmanager".bind_resource;
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local sm_make_authenticated = require "core.sessionmanager".make_authenticated;
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local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
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local base64 = require "util.encodings".base64;
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local cert_verify_identity = require "util.x509".verify_identity;
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local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler;
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local tostring = tostring;
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local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
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local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth")
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local log = module._log;
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local xmlns_sasl ='urn:ietf:params:xml:ns:xmpp-sasl';
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local xmlns_bind ='urn:ietf:params:xml:ns:xmpp-bind';
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local function build_reply(status, ret, err_msg)
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local reply = st.stanza(status, {xmlns = xmlns_sasl});
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if status == "challenge" then
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--log("debug", "CHALLENGE: %s", ret or "");
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reply:text(base64.encode(ret or ""));
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elseif status == "failure" then
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reply:tag(ret):up();
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if err_msg then reply:tag("text"):text(err_msg); end
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elseif status == "success" then
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--log("debug", "SUCCESS: %s", ret or "");
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reply:text(base64.encode(ret or ""));
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else
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module:log("error", "Unknown sasl status: %s", status);
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end
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return reply;
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end
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local function handle_status(session, status, ret, err_msg)
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if status == "failure" then
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module:fire_event("authentication-failure", { session = session, condition = ret, text = err_msg });
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session.sasl_handler = session.sasl_handler:clean_clone();
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elseif status == "success" then
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local ok, err = sm_make_authenticated(session, session.sasl_handler.username);
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if ok then
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module:fire_event("authentication-success", { session = session });
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session.sasl_handler = nil;
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session:reset_stream();
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else
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module:log("warn", "SASL succeeded but username was invalid");
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module:fire_event("authentication-failure", { session = session, condition = "not-authorized", text = err });
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session.sasl_handler = session.sasl_handler:clean_clone();
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return "failure", "not-authorized", "User authenticated successfully, but username was invalid";
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end
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end
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return status, ret, err_msg;
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end
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local function sasl_process_cdata(session, stanza)
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local text = stanza[1];
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if text then
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text = base64.decode(text);
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--log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " "));
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if not text then
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session.sasl_handler = nil;
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session.send(build_reply("failure", "incorrect-encoding"));
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return true;
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end
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end
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local status, ret, err_msg = session.sasl_handler:process(text);
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status, ret, err_msg = handle_status(session, status, ret, err_msg);
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local s = build_reply(status, ret, err_msg);
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log("debug", "sasl reply: %s", tostring(s));
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session.send(s);
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return true;
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end
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module:hook_stanza(xmlns_sasl, "success", function (session, stanza)
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if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end
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module:log("debug", "SASL EXTERNAL with %s succeeded", session.to_host);
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session.external_auth = "succeeded"
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session:reset_stream();
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local default_stream_attr = {xmlns = "jabber:server", ["xmlns:stream"] = "http://etherx.jabber.org/streams",
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["xmlns:db"] = 'jabber:server:dialback', version = "1.0", to = session.to_host, from = session.from_host};
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session.sends2s("<?xml version='1.0'?>");
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session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
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s2s_make_authenticated(session, session.to_host);
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return true;
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end)
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module:hook_stanza(xmlns_sasl, "failure", function (session, stanza)
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if session.type ~= "s2sout_unauthed" or session.external_auth ~= "attempting" then return; end
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module:log("info", "SASL EXTERNAL with %s failed", session.to_host)
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-- TODO: Log the failure reason
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session.external_auth = "failed"
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end, 500)
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module:hook_stanza(xmlns_sasl, "failure", function (session, stanza)
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-- TODO: Dialback wasn't loaded. Do something useful.
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end, 90)
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module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
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if session.type ~= "s2sout_unauthed" or not session.secure then return; end
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local mechanisms = stanza:get_child("mechanisms", xmlns_sasl)
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if mechanisms then
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for mech in mechanisms:childtags() do
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if mech[1] == "EXTERNAL" then
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module:log("debug", "Initiating SASL EXTERNAL with %s", session.to_host);
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local reply = st.stanza("auth", {xmlns = xmlns_sasl, mechanism = "EXTERNAL"});
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reply:text(base64.encode(session.from_host))
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session.sends2s(reply)
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session.external_auth = "attempting"
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return true
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end
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end
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end
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end, 150);
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local function s2s_external_auth(session, stanza)
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local mechanism = stanza.attr.mechanism;
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if not session.secure then
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if mechanism == "EXTERNAL" then
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session.sends2s(build_reply("failure", "encryption-required"))
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else
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session.sends2s(build_reply("failure", "invalid-mechanism"))
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end
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return true;
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end
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if mechanism ~= "EXTERNAL" or session.cert_chain_status ~= "valid" then
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session.sends2s(build_reply("failure", "invalid-mechanism"))
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return true;
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end
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local text = stanza[1]
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if not text then
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session.sends2s(build_reply("failure", "malformed-request"))
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return true
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end
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-- Either the value is "=" and we've already verified the external
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-- cert identity, or the value is a string and either matches the
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-- from_host (
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text = base64.decode(text)
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if not text then
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session.sends2s(build_reply("failure", "incorrect-encoding"))
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return true;
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end
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if session.cert_identity_status == "valid" then
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if text ~= "" and text ~= session.from_host then
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session.sends2s(build_reply("failure", "invalid-authzid"))
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return true
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end
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else
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if text == "" then
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session.sends2s(build_reply("failure", "invalid-authzid"))
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return true
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end
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local cert = session.conn:socket():getpeercertificate()
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if (cert_verify_identity(text, "xmpp-server", cert)) then
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session.cert_identity_status = "valid"
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else
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session.cert_identity_status = "invalid"
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session.sends2s(build_reply("failure", "invalid-authzid"))
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return true
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end
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end
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session.external_auth = "succeeded"
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if not session.from_host then
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session.from_host = text;
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end
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session.sends2s(build_reply("success"))
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local domain = text ~= "" and text or session.from_host;
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module:log("info", "Accepting SASL EXTERNAL identity from %s", domain);
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s2s_make_authenticated(session, domain);
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session:reset_stream();
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return true
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end
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module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function(event)
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local session, stanza = event.origin, event.stanza;
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if session.type == "s2sin_unauthed" then
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return s2s_external_auth(session, stanza)
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end
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if session.type ~= "c2s_unauthed" then return; end
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if session.sasl_handler and session.sasl_handler.selected then
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session.sasl_handler = nil; -- allow starting a new SASL negotiation before completing an old one
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end
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if not session.sasl_handler then
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session.sasl_handler = usermanager_get_sasl_handler(module.host, session);
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end
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local mechanism = stanza.attr.mechanism;
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if not session.secure and (secure_auth_only or (mechanism == "PLAIN" and not allow_unencrypted_plain_auth)) then
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session.send(build_reply("failure", "encryption-required"));
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return true;
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end
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local valid_mechanism = session.sasl_handler:select(mechanism);
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if not valid_mechanism then
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session.send(build_reply("failure", "invalid-mechanism"));
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return true;
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end
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return sasl_process_cdata(session, stanza);
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end);
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module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:response", function(event)
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local session = event.origin;
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if not(session.sasl_handler and session.sasl_handler.selected) then
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session.send(build_reply("failure", "not-authorized", "Out of order SASL element"));
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return true;
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end
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return sasl_process_cdata(session, event.stanza);
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end);
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module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:abort", function(event)
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local session = event.origin;
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session.sasl_handler = nil;
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session.send(build_reply("failure", "aborted"));
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return true;
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end);
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local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
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local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
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local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
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module:hook("stream-features", function(event)
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local origin, features = event.origin, event.features;
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if not origin.username then
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if secure_auth_only and not origin.secure then
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return;
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end
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origin.sasl_handler = usermanager_get_sasl_handler(module.host, origin);
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local mechanisms = st.stanza("mechanisms", mechanisms_attr);
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for mechanism in pairs(origin.sasl_handler:mechanisms()) do
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if mechanism ~= "PLAIN" or origin.secure or allow_unencrypted_plain_auth then
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mechanisms:tag("mechanism"):text(mechanism):up();
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end
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end
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if mechanisms[1] then features:add_child(mechanisms); end
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else
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features:tag("bind", bind_attr):tag("required"):up():up();
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features:tag("session", xmpp_session_attr):tag("optional"):up():up();
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end
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end);
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module:hook("s2s-stream-features", function(event)
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local origin, features = event.origin, event.features;
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if origin.secure and origin.type == "s2sin_unauthed" then
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-- Offer EXTERNAL if chain is valid and either we didn't validate
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-- the identity or it passed.
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if origin.cert_chain_status == "valid" and origin.cert_identity_status ~= "invalid" then --TODO: Configurable
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module:log("debug", "Offering SASL EXTERNAL")
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features:tag("mechanisms", { xmlns = xmlns_sasl })
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:tag("mechanism"):text("EXTERNAL")
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:up():up();
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end
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end
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end);
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module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-bind:bind", function(event)
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local origin, stanza = event.origin, event.stanza;
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local resource;
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if stanza.attr.type == "set" then
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local bind = stanza.tags[1];
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resource = bind:child_with_name("resource");
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resource = resource and #resource.tags == 0 and resource[1] or nil;
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end
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local success, err_type, err, err_msg = sm_bind_resource(origin, resource);
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if success then
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origin.send(st.reply(stanza)
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:tag("bind", { xmlns = xmlns_bind })
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:tag("jid"):text(origin.full_jid));
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origin.log("debug", "Resource bound: %s", origin.full_jid);
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else
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origin.send(st.error_reply(stanza, err_type, err, err_msg));
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origin.log("debug", "Resource bind failed: %s", err_msg or err);
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end
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return true;
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end);
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local function handle_legacy_session(event)
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event.origin.send(st.reply(event.stanza));
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return true;
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end
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module:hook("iq/self/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session);
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module:hook("iq/host/urn:ietf:params:xml:ns:xmpp-session:session", handle_legacy_session);
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