-- Prosody IM
--- Copyright (C) 2008-2009 Matthew Wild
--- Copyright (C) 2008-2009 Waqas Hussain
---
+-- 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.
--
local sm_make_authenticated = require "core.sessionmanager".make_authenticated;
local base64 = require "util.encodings".base64;
-local nodeprep = require "util.encodings".stringprep.nodeprep;
-local datamanager_load = require "util.datamanager".load;
-local usermanager_validate_credentials = require "core.usermanager".validate_credentials;
-local usermanager_get_supported_methods = require "core.usermanager".get_supported_methods;
-local usermanager_user_exists = require "core.usermanager".user_exists;
-local usermanager_get_password = require "core.usermanager".get_password;
-local t_concat, t_insert = table.concat, table.insert;
+local cert_verify_identity = require "util.x509".verify_identity;
+
+local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler;
local tostring = tostring;
-local jid_split = require "util.jid".split;
-local md5 = require "util.hashes".md5;
-local config = require "core.configmanager";
local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
-local sasl_backend = module:get_option("sasl_backend") or "builtin";
+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;
-if sasl_backend == "cyrus" then
- prosody.unlock_globals(); --FIXME: Figure out why this is needed and
- -- why cyrussasl isn't caught by the sandbox
- local ok, cyrus = pcall(require, "util.sasl_cyrus");
- prosody.lock_globals();
- if ok then
- local cyrus_new = cyrus.new;
- new_sasl = function(realm)
- return cyrus_new(realm, module:get_option("cyrus_service_name") or "xmpp");
- end
- else
- sasl_backend = "builtin";
- module:log("warn", "Failed to load Cyrus SASL, falling back to builtin auth mechanisms");
- module:log("debug", "Failed to load Cyrus because: %s", cyrus);
- end
-end
-if not new_sasl then
- if sasl_backend ~= "builtin" then module:log("warn", "Unknown SASL backend %s", sasl_backend); end;
- new_sasl = require "util.sasl".new;
-end
-
-local default_authentication_profile = {
- plain = function(username, realm)
- local prepped_username = nodeprep(username);
- if not prepped_username then
- log("debug", "NODEprep failed on username: %s", username);
- return "", nil;
- end
- local password = usermanager_get_password(prepped_username, realm);
- if not password then
- return "", nil;
- end
- return password, true;
- end
-};
-
-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});
return reply;
end
-local function handle_status(session, status)
+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);
- if not username then -- TODO move this to sessionmanager
- module:log("warn", "SASL succeeded but we didn't get a 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();
- return;
+ 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
- sm_make_authenticated(session, session.sasl_handler.username);
- session.sasl_handler = nil;
- session:reset_stream();
end
+ return status, ret, err_msg;
end
-local function sasl_handler(session, stanza)
- if stanza.name == "auth" then
- -- FIXME ignoring duplicates because ejabberd does
- if config.get(session.host or "*", "core", "anonymous_login") then
- if stanza.attr.mechanism ~= "ANONYMOUS" then
- return session.send(build_reply("failure", "invalid-mechanism"));
- end
- elseif stanza.attr.mechanism == "ANONYMOUS" then
- return session.send(build_reply("failure", "mechanism-too-weak"));
- end
- local valid_mechanism = session.sasl_handler:select(stanza.attr.mechanism);
- if not valid_mechanism then
- return session.send(build_reply("failure", "invalid-mechanism"));
- end
- if secure_auth_only and not session.secure then
- return session.send(build_reply("failure", "encryption-required"));
- 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);
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);
- handle_status(session, status);
+ status, ret, err_msg = handle_status(session, status, ret, err_msg);
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' };
if secure_auth_only and not origin.secure then
return;
end
- local realm = module:get_option("sasl_realm") or origin.host;
- if module:get_option("anonymous_login") then
- origin.sasl_handler = new_sasl(realm, anonymous_authentication_profile);
- else
- origin.sasl_handler = new_sasl(realm, default_authentication_profile);
- if not (module:get_option("allow_unencrypted_plain_auth")) and not origin.secure then
- origin.sasl_handler:forbidden({"PLAIN"});
+ origin.sasl_handler = usermanager_get_sasl_handler(module.host, origin);
+ 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
+ mechanisms:tag("mechanism"):text(mechanism):up();
end
end
- features:tag("mechanisms", mechanisms_attr);
- for k, v in pairs(origin.sasl_handler:mechanisms()) do
- features:tag("mechanism"):text(v):up();
- 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:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-bind", function(session, stanza)
- log("debug", "Client requesting a resource bind");
+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;
if stanza.attr.type == "set" then
local bind = stanza.tags[1];
- if bind and bind.attr.xmlns == xmlns_bind then
- resource = bind:child_with_name("resource");
- if resource then
- resource = resource[1];
- end
- end
+ resource = bind:child_with_name("resource");
+ resource = resource and #resource.tags == 0 and resource[1] or nil;
end
- local success, err_type, err, err_msg = sm_bind_resource(session, resource);
- if not success then
- session.send(st.error_reply(stanza, err_type, err, err_msg));
+ local success, err_type, err, err_msg = sm_bind_resource(origin, resource);
+ if success then
+ origin.send(st.reply(stanza)
+ :tag("bind", { xmlns = xmlns_bind })
+ :tag("jid"):text(origin.full_jid));
+ origin.log("debug", "Resource bound: %s", origin.full_jid);
else
- session.send(st.reply(stanza)
- :tag("bind", { xmlns = xmlns_bind})
- :tag("jid"):text(session.full_jid));
+ origin.send(st.error_reply(stanza, err_type, err, err_msg));
+ origin.log("debug", "Resource bind failed: %s", err_msg or err);
end
+ return true;
end);
-module:add_iq_handler("c2s", "urn:ietf:params:xml:ns:xmpp-session", function(session, stanza)
- log("debug", "Client requesting a session");
- session.send(st.reply(stanza));
-end);
+local function handle_legacy_session(event)
+ event.origin.send(st.reply(event.stanza));
+ return true;
+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);
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