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-- Prosody IM
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local st = require "util.stanza";
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 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 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 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
local ok, cyrus = pcall(require, "util.sasl_cyrus");
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");
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});
if status == "challenge" then
--log("debug", "CHALLENGE: %s", ret or "");
reply:text(base64.encode(ret or ""));
elseif status == "failure" then
reply:tag(ret):up();
if err_msg then reply:tag("text"):text(err_msg); end
elseif status == "success" then
--log("debug", "SUCCESS: %s", ret or "");
reply:text(base64.encode(ret or ""));
else
module:log("error", "Unknown sasl status: %s", status);
end
return reply;
end
local function handle_status(session, status)
if status == "failure" then
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!");
session.sasl_handler = nil;
session:reset_stream();
return;
end
sm_make_authenticated(session, session.sasl_handler.username);
session.sasl_handler = nil;
session:reset_stream();
end
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 text = stanza[1];
if text then
text = base64.decode(text);
--log("debug", "AUTH: %s", text:gsub("[%z\001-\008\011\012\014-\031]", " "));
if not text then
session.sasl_handler = nil;
session.send(build_reply("failure", "incorrect-encoding"));
return;
end
end
local status, ret, err_msg = session.sasl_handler:process(text);
handle_status(session, status);
local s = build_reply(status, ret, err_msg);
log("debug", "sasl reply: %s", tostring(s));
session.send(s);
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);
local mechanisms_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-sasl' };
local bind_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-bind' };
local xmpp_session_attr = { xmlns='urn:ietf:params:xml:ns:xmpp-session' };
module:hook("stream-features", function(event)
local origin, features = event.origin, event.features;
if not origin.username then
if secure_auth_only and not origin.secure then
return;
end
if module:get_option("anonymous_login") then
origin.sasl_handler = new_sasl(origin.host, anonymous_authentication_profile);
else
origin.sasl_handler = new_sasl(origin.host, default_authentication_profile);
if not (module:get_option("allow_unencrypted_plain_auth")) and not origin.secure then
origin.sasl_handler:forbidden({"PLAIN"});
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();
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");
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
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));
else
session.send(st.reply(stanza)
:tag("bind", { xmlns = xmlns_bind})
:tag("jid"):text(session.full_jid));
end
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);
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