local sm_make_authenticated = require "core.sessionmanager".make_authenticated;
local base64 = require "util.encodings".base64;
-local cert_verify_identity = require "util.x509".verify_identity;
-
local usermanager_get_sasl_handler = require "core.usermanager".get_sasl_handler;
local tostring = tostring;
-local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
-local allow_unencrypted_plain_auth = module:get_option("allow_unencrypted_plain_auth")
+local secure_auth_only = module:get_option_boolean("c2s_require_encryption", module:get_option_boolean("require_encryption", false));
+local allow_unencrypted_plain_auth = module:get_option_boolean("allow_unencrypted_plain_auth", false)
+local insecure_mechanisms = module:get_option_set("insecure_sasl_mechanisms", allow_unencrypted_plain_auth and {} or {"PLAIN", "LOGIN"});
+local disabled_mechanisms = module:get_option_set("disable_sasl_mechanisms", { "DIGEST-MD5" });
local log = module._log;
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
+ if 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 ""));
+ elseif status == "challenge" or status == "success" then
+ if ret == "" then
+ reply:text("=")
+ elseif ret then
+ reply:text(base64.encode(ret));
+ end
else
module:log("error", "Unknown sasl status: %s", status);
end
module:log("info", "SASL EXTERNAL with %s failed", session.to_host)
-- TODO: Log the failure reason
session.external_auth = "failed"
+ session:close();
+ return true;
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
end, 150);
local function s2s_external_auth(session, stanza)
+ if session.external_auth ~= "offered" then return end -- Unexpected request
+
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
+ if mechanism ~= "EXTERNAL" then
+ session.sends2s(build_reply("failure", "invalid-mechanism"));
return true;
end
- if mechanism ~= "EXTERNAL" or session.cert_chain_status ~= "valid" then
- session.sends2s(build_reply("failure", "invalid-mechanism"))
+ if not session.secure then
+ session.sends2s(build_reply("failure", "encryption-required"));
return true;
end
- local text = stanza[1]
+ local text = stanza[1];
if not text then
- session.sends2s(build_reply("failure", "malformed-request"))
- return true
+ 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)
+ text = base64.decode(text);
if not text then
- session.sends2s(build_reply("failure", "incorrect-encoding"))
+ 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
+ -- The text value is either "" or equals session.from_host
+ if not ( text == "" or text == session.from_host ) then
+ session.sends2s(build_reply("failure", "invalid-authzid"));
+ return true;
end
- session.external_auth = "succeeded"
-
- if not session.from_host then
- session.from_host = text;
+ -- We've already verified the external cert identity before offering EXTERNAL
+ if session.cert_chain_status ~= "valid" or session.cert_identity_status ~= "valid" then
+ session.sends2s(build_reply("failure", "not-authorized"));
+ session:close();
+ return true;
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 });
+ -- Success!
+ session.external_auth = "succeeded";
+ session.sends2s(build_reply("success"));
+ module:log("info", "Accepting SASL EXTERNAL identity from %s", session.from_host);
+ module:fire_event("s2s-authenticated", { session = session, host = session.from_host });
session:reset_stream();
- return true
+ return true;
end
module:hook("stanza/urn:ietf:params:xml:ns:xmpp-sasl:auth", function(event)
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
+ if not session.secure and (secure_auth_only or insecure_mechanisms:contains(mechanism)) then
session.send(build_reply("failure", "encryption-required"));
return true;
+ elseif disabled_mechanisms:contains(mechanism) then
+ session.send(build_reply("failure", "invalid-mechanism"));
+ return true;
end
local valid_mechanism = session.sasl_handler:select(mechanism);
if not valid_mechanism then
return true;
end);
+local function tls_unique(self)
+ return self.userdata["tls-unique"]:getpeerfinished();
+end
+
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' };
if secure_auth_only and not origin.secure then
return;
end
- origin.sasl_handler = usermanager_get_sasl_handler(module.host, origin);
+ local sasl_handler = usermanager_get_sasl_handler(module.host, origin)
+ origin.sasl_handler = sasl_handler;
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 and origin.sasl_handler.add_cb_handler then
- origin.sasl_handler:add_cb_handler("tls-unique", function(self)
- return self.userdata:getpeerfinished();
- end);
- origin.sasl_handler["userdata"] = origin.conn:socket();
+ if sasl_handler.add_cb_handler then
+ local socket = origin.conn:socket();
+ if socket.getpeerfinished then
+ sasl_handler:add_cb_handler("tls-unique", tls_unique);
+ end
+ sasl_handler["userdata"] = {
+ ["tls-unique"] = socket;
+ };
end
end
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
+ for mechanism in pairs(sasl_handler:mechanisms()) do
+ if (not disabled_mechanisms:contains(mechanism)) and (origin.secure or not insecure_mechanisms:contains(mechanism)) then
mechanisms:tag("mechanism"):text(mechanism):up();
end
end
- if mechanisms[1] then features:add_child(mechanisms); end
+ if mechanisms[1] then
+ features:add_child(mechanisms);
+ else
+ (origin.log or log)("warn", "No SASL mechanisms to offer");
+ end
else
features:tag("bind", bind_attr):tag("required"):up():up();
features:tag("session", xmpp_session_attr):tag("optional"):up():up();
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")
+ -- Offer EXTERNAL only if both chain and identity is valid.
+ if origin.cert_chain_status == "valid" and origin.cert_identity_status == "valid" then
+ module:log("debug", "Offering SASL EXTERNAL");
+ origin.external_auth = "offered"
features:tag("mechanisms", { xmlns = xmlns_sasl })
:tag("mechanism"):text("EXTERNAL")
:up():up();
local resource;
if stanza.attr.type == "set" then
local bind = stanza.tags[1];
- resource = bind:child_with_name("resource");
+ resource = bind:get_child("resource");
resource = resource and #resource.tags == 0 and resource[1] or nil;
end
local success, err_type, err, err_msg = sm_bind_resource(origin, resource);
projects / prosody.git / blobdiff