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using Xmpp.Core;
namespace Xmpp.Tls {
private const string NS_URI = "urn:ietf:params:xml:ns:xmpp-tls";
public class Module : XmppStreamNegotiationModule {
public const string ID = "tls_module";
public static ModuleIdentity<Module> IDENTITY = new ModuleIdentity<Module>(NS_URI, ID);
public bool require { get; set; default = true; }
public bool server_supports_tls = false;
public bool server_requires_tls = false;
public SocketConnectable? identity = null;
public override void attach(XmppStream stream) {
stream.received_features_node.connect(this.received_features_node);
stream.received_nonza.connect(this.received_nonza);
}
public override void detach(XmppStream stream) {
stream.received_features_node.disconnect(this.received_features_node);
stream.received_nonza.disconnect(this.received_nonza);
}
private void received_nonza(XmppStream stream, StanzaNode node) {
if (node.ns_uri == NS_URI && node.name == "proceed") {
try {
var io_stream = stream.get_stream();
if (io_stream == null) return;
var conn = TlsClientConnection.new(io_stream, identity);
// TODO: Add certificate error handling, that is, allow the
// program to handle certificate errors. The certificate
// *is checked* by TlsClientConnection, and connection is
// not allowed to continue in case that there is an error.
stream.reset_stream(conn);
var flag = Flag.get_flag(stream);
flag.peer_certificate = conn.get_peer_certificate();
flag.finished = true;
} catch (Error e) {
stderr.printf("Failed to start TLS: %s\n", e.message);
}
}
}
private void received_features_node(XmppStream stream) {
if (Flag.has_flag(stream)) return;
if (stream.is_setup_needed()) return;
var starttls = stream.features.get_subnode("starttls", NS_URI);
if (starttls != null) {
server_supports_tls = true;
if (starttls.get_subnode("required") != null || stream.features.get_all_subnodes().size == 1) {
server_requires_tls = true;
}
if (server_requires_tls || require) {
try {
stream.write(new StanzaNode.build("starttls", NS_URI).add_self_xmlns());
} catch (IOStreamError e) {
stderr.printf("Failed to request TLS: %s\n", e.message);
}
}
if (identity == null) {
identity = new NetworkService("xmpp-client", "tcp", stream.remote_name);
}
stream.add_flag(new Flag());
}
}
public static Module? get_module(XmppStream stream) {
return (Module?) stream.get_module(IDENTITY);
}
public override bool mandatory_outstanding(XmppStream stream) {
return require && (!Flag.has_flag(stream) || !Flag.get_flag(stream).finished);
}
public override bool negotiation_active(XmppStream stream) {
return Flag.has_flag(stream) && !Flag.get_flag(stream).finished;
}
public override string get_ns() { return NS_URI; }
public override string get_id() { return ID; }
}
public class Flag : XmppStreamFlag {
public const string ID = "tls_flag";
public TlsCertificate? peer_certificate;
public bool finished = false;
public static Flag? get_flag(XmppStream stream) {
return (Flag?) stream.get_flag(NS_URI, ID);
}
public static bool has_flag(XmppStream stream) {
return get_flag(stream) != null;
}
public override string get_ns() { return NS_URI; }
public override string get_id() { return ID; }
}
}
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