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authorfiaxh <git@mx.ax.lt>2017-03-12 02:49:53 +0100
committerfiaxh <git@mx.ax.lt>2017-03-12 02:52:43 +0100
commit7e1ecb34cb1eca2b74949c7ddc2ad52fb02e3a77 (patch)
tree1a7a479efffafcf5098798fd5ce8d815bf4503a9 /plugins/openpgp/src/xmpp_module.vala
parent63fffcddce49e231e82ee60aef4a23a16caa931e (diff)
downloaddino-7e1ecb34cb1eca2b74949c7ddc2ad52fb02e3a77.tar.gz
dino-7e1ecb34cb1eca2b74949c7ddc2ad52fb02e3a77.zip
Move PGP support into plugin
Diffstat (limited to 'plugins/openpgp/src/xmpp_module.vala')
-rw-r--r--plugins/openpgp/src/xmpp_module.vala154
1 files changed, 154 insertions, 0 deletions
diff --git a/plugins/openpgp/src/xmpp_module.vala b/plugins/openpgp/src/xmpp_module.vala
new file mode 100644
index 00000000..440be5f1
--- /dev/null
+++ b/plugins/openpgp/src/xmpp_module.vala
@@ -0,0 +1,154 @@
+using GPG;
+
+using Xmpp;
+using Xmpp.Core;
+
+namespace Dino.Plugins.OpenPgp {
+ private const string NS_URI = "jabber:x";
+ private const string NS_URI_ENCRYPTED = NS_URI + ":encrypted";
+ private const string NS_URI_SIGNED = NS_URI + ":signed";
+
+ public class Module : XmppStreamModule {
+ public const string ID = "0027_current_pgp_usage";
+ public static ModuleIdentity<Module> IDENTITY = new ModuleIdentity<Module>(NS_URI, ID);
+
+ public signal void received_jid_key_id(XmppStream stream, string jid, string key_id);
+
+ private string? signed_status;
+ private string? own_key_id;
+
+ public Module() {
+ signed_status = gpg_sign("");
+ if (signed_status != null) own_key_id = gpg_verify(signed_status, "");
+ }
+
+ public bool encrypt(Message.Stanza message, string key_id) {
+ string? enc_body = gpg_encrypt(message.body, new string[] {key_id, own_key_id});
+ if (enc_body != null) {
+ message.stanza.put_node(new StanzaNode.build("x", NS_URI_ENCRYPTED).add_self_xmlns().put_node(new StanzaNode.text(enc_body)));
+ message.body = "[This message is OpenPGP encrypted (see XEP-0027)]";
+ return true;
+ }
+ return false;
+ }
+
+ public string? get_cyphertext(Message.Stanza message) {
+ StanzaNode? x_node = message.stanza.get_subnode("x", NS_URI_ENCRYPTED);
+ return x_node == null ? null : x_node.get_string_content();
+ }
+
+ public override void attach(XmppStream stream) {
+ Presence.Module.require(stream);
+ stream.get_module(Presence.Module.IDENTITY).received_presence.connect(on_received_presence);
+ stream.get_module(Presence.Module.IDENTITY).pre_send_presence_stanza.connect(on_pre_send_presence_stanza);
+ Message.Module.require(stream);
+ stream.get_module(Message.Module.IDENTITY).pre_received_message.connect(on_pre_received_message);
+ stream.add_flag(new Flag());
+ }
+
+ public override void detach(XmppStream stream) {
+ stream.get_module(Presence.Module.IDENTITY).received_presence.disconnect(on_received_presence);
+ stream.get_module(Presence.Module.IDENTITY).pre_send_presence_stanza.disconnect(on_pre_send_presence_stanza);
+ stream.get_module(Message.Module.IDENTITY).pre_received_message.disconnect(on_pre_received_message);
+ }
+
+ public static void require(XmppStream stream) {
+ if (stream.get_module(IDENTITY) == null) stream.add_module(new Module());
+ }
+
+ public override string get_ns() { return NS_URI; }
+ public override string get_id() { return ID; }
+
+ private void on_received_presence(XmppStream stream, Presence.Stanza presence) {
+ StanzaNode x_node = presence.stanza.get_subnode("x", NS_URI_SIGNED);
+ if (x_node != null) {
+ string? sig = x_node.get_string_content();
+ if (sig != null) {
+ string signed_data = presence.status == null ? "" : presence.status;
+ string? key_id = gpg_verify(sig, signed_data);
+ if (key_id != null) {
+ Flag.get_flag(stream).set_key_id(presence.from, key_id);
+ received_jid_key_id(stream, presence.from, key_id);
+ }
+ }
+ }
+ }
+
+ private void on_pre_send_presence_stanza(XmppStream stream, Presence.Stanza presence) {
+ if (presence.type_ == Presence.Stanza.TYPE_AVAILABLE && signed_status != null) {
+ presence.stanza.put_node(new StanzaNode.build("x", NS_URI_SIGNED).add_self_xmlns().put_node(new StanzaNode.text(signed_status)));
+ }
+ }
+
+ private void on_pre_received_message(XmppStream stream, Message.Stanza message) {
+ string? encrypted = get_cyphertext(message);
+ if (encrypted != null) {
+ MessageFlag flag = new MessageFlag();
+ message.add_flag(flag);
+ string? decrypted = gpg_decrypt(encrypted);
+ if (decrypted != null) {
+ flag.decrypted = true;
+ message.body = decrypted;
+ }
+ }
+ }
+
+ private static string? gpg_encrypt(string plain, string[] key_ids) {
+ GPG.Key[] keys = new GPG.Key[key_ids.length];
+ string encr;
+ try {
+ for (int i = 0; i < key_ids.length; i++) {
+ keys[i] = GPGHelper.get_public_key(key_ids[i]);
+ }
+ encr = GPGHelper.encrypt_armor(plain, keys, GPG.EncryptFlags.ALWAYS_TRUST);
+ } catch (Error e) {
+ return null;
+ }
+ int encryption_start = encr.index_of("\n\n") + 2;
+ return encr.substring(encryption_start, encr.length - "\n-----END PGP MESSAGE-----".length - encryption_start);
+ }
+
+ private static string? gpg_decrypt(string enc) {
+ string armor = "-----BEGIN PGP MESSAGE-----\n\n" + enc + "\n-----END PGP MESSAGE-----";
+ string? decr = null;
+ try {
+ decr = GPGHelper.decrypt(armor);
+ } catch (Error e) { }
+ return decr;
+ }
+
+ private static string? gpg_verify(string sig, string signed_text) {
+ string armor = "-----BEGIN PGP MESSAGE-----\n\n" + sig + "\n-----END PGP MESSAGE-----";
+ string? sign_key = null;
+ try {
+ sign_key = GPGHelper.get_sign_key(armor, signed_text);
+ } catch (Error e) { }
+ return sign_key;
+ }
+
+ private static string? gpg_sign(string str) {
+ string signed;
+ try {
+ signed = GPGHelper.sign(str, GPG.SigMode.CLEAR);
+ } catch (Error e) {
+ return null;
+ }
+ int signature_start = signed.index_of("-----BEGIN PGP SIGNATURE-----");
+ signature_start = signed.index_of("\n\n", signature_start) + 2;
+ return signed.substring(signature_start, signed.length - "\n-----END PGP SIGNATURE-----".length - signature_start);
+ }
+ }
+
+ public class MessageFlag : Message.MessageFlag {
+ public const string id = "pgp";
+
+ public bool decrypted = false;
+
+ public static MessageFlag? get_flag(Message.Stanza message) {
+ return (MessageFlag) message.get_flag(NS_URI, id);
+ }
+
+ public override string get_ns() { return NS_URI; }
+ public override string get_id() { return id; }
+ }
+}