+-- 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.
+--
+local create_context = require "core.certmanager".create_context;
local st = require "util.stanza";
-local send = require "core.sessionmanager".send_to_session;
-
---local sessions = sessions;
-
-local t_insert = table.insert;
-
-local log = require "util.logger".init("mod_starttls");
-
-local xmlns_starttls ='urn:ietf:params:xml:ns:xmpp-tls';
-
-add_handler("c2s_unauthed", "starttls", xmlns_starttls,
- function (session, stanza)
- if session.conn.starttls then
- send(session, st.stanza("proceed", { xmlns = xmlns_starttls }));
- -- FIXME: I'm commenting the below, not sure why it was necessary
- -- sessions[session.conn] = nil;
- session:reset_stream();
- session.conn.starttls();
- session.log("info", "TLS negotiation started...");
- else
- -- FIXME: What reply?
- session.log("warn", "Attempt to start TLS, but TLS is not available on this connection");
- end
- end);
-
-add_event_hook("stream-features",
- function (session, features)
- if session.conn.starttls then
- t_insert(features, "<starttls xmlns='"..xmlns_starttls.."'/>");
- end
- end);
+
+local c2s_require_encryption = module:get_option("c2s_require_encryption", module:get_option("require_encryption"));
+local s2s_require_encryption = module:get_option("s2s_require_encryption");
+local allow_s2s_tls = module:get_option("s2s_allow_encryption") ~= false;
+local s2s_secure_auth = module:get_option("s2s_secure_auth");
+
+if s2s_secure_auth and s2s_require_encryption == false then
+ module:log("warn", "s2s_secure_auth implies s2s_require_encryption, but s2s_require_encryption is set to false");
+ s2s_require_encryption = true;
+end
+
+local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';
+local starttls_attr = { xmlns = xmlns_starttls };
+local starttls_proceed = st.stanza("proceed", starttls_attr);
+local starttls_failure = st.stanza("failure", starttls_attr);
+local c2s_feature = st.stanza("starttls", starttls_attr);
+local s2s_feature = st.stanza("starttls", starttls_attr);
+if c2s_require_encryption then c2s_feature:tag("required"):up(); end
+if s2s_require_encryption then s2s_feature:tag("required"):up(); end
+
+local hosts = prosody.hosts;
+local host = hosts[module.host];
+
+local ssl_ctx_c2s, ssl_ctx_s2sout, ssl_ctx_s2sin;
+do
+ local NULL, err = {};
+ local global = module:context("*");
+ local parent = module:context(module.host:match("%.(.*)$"));
+
+ local parent_ssl = parent:get_option("ssl");
+ local host_ssl = module:get_option("ssl", parent_ssl);
+
+ local global_c2s = global:get_option("c2s_ssl", NULL);
+ local parent_c2s = parent:get_option("c2s_ssl", NULL);
+ local host_c2s = module:get_option("c2s_ssl", parent_c2s);
+
+ local global_s2s = global:get_option("s2s_ssl", NULL);
+ local parent_s2s = parent:get_option("s2s_ssl", NULL);
+ local host_s2s = module:get_option("s2s_ssl", parent_s2s);
+
+ ssl_ctx_c2s, err = create_context(host.host, "server", host_c2s, host_ssl, global_c2s); -- for incoming client connections
+ if err then module:log("error", "Error creating context for c2s: %s", err); end
+
+ ssl_ctx_s2sin, err = create_context(host.host, "server", host_s2s, host_ssl, global_s2s); -- for incoming server connections
+ ssl_ctx_s2sout = create_context(host.host, "client", host_s2s, host_ssl, global_s2s); -- for outgoing server connections
+ if err then module:log("error", "Error creating context for s2s: %s", err); end -- Both would have the same issue
+end
+
+local function can_do_tls(session)
+ if not session.conn.starttls then
+ return false;
+ elseif session.ssl_ctx then
+ return true;
+ end
+ if session.type == "c2s_unauthed" then
+ session.ssl_ctx = ssl_ctx_c2s;
+ elseif session.type == "s2sin_unauthed" and allow_s2s_tls then
+ session.ssl_ctx = ssl_ctx_s2sin;
+ elseif session.direction == "outgoing" and allow_s2s_tls then
+ session.ssl_ctx = ssl_ctx_s2sout;
+ else
+ return false;
+ end
+ return session.ssl_ctx;
+end
+
+-- Hook <starttls/>
+module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
+ local origin = event.origin;
+ if can_do_tls(origin) then
+ (origin.sends2s or origin.send)(starttls_proceed);
+ origin:reset_stream();
+ origin.conn:starttls(origin.ssl_ctx);
+ origin.log("debug", "TLS negotiation started for %s...", origin.type);
+ origin.secure = false;
+ else
+ origin.log("warn", "Attempt to start TLS, but TLS is not available on this %s connection", origin.type);
+ (origin.sends2s or origin.send)(starttls_failure);
+ origin:close();
+ end
+ return true;
+end);
+
+-- Advertize stream feature
+module:hook("stream-features", function(event)
+ local origin, features = event.origin, event.features;
+ if can_do_tls(origin) then
+ features:add_child(c2s_feature);
+ end
+end);
+module:hook("s2s-stream-features", function(event)
+ local origin, features = event.origin, event.features;
+ if can_do_tls(origin) then
+ features:add_child(s2s_feature);
+ end
+end);
+
+-- For s2sout connections, start TLS if we can
+module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
+ module:log("debug", "Received features element");
+ if can_do_tls(session) and stanza:get_child("starttls", xmlns_starttls) then
+ module:log("debug", "%s is offering TLS, taking up the offer...", session.to_host);
+ session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
+ return true;
+ end
+end, 500);
+
+module:hook_stanza(xmlns_starttls, "proceed", function (session, stanza)
+ module:log("debug", "Proceeding with TLS on s2sout...");
+ session:reset_stream();
+ session.conn:starttls(session.ssl_ctx);
+ session.secure = false;
+ return true;
+end);
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