1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
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 = null;
private Key? own_key = null;
public Module(string? own_key_id = null) {
set_private_key_id(own_key_id);
}
public void set_private_key_id(string? own_key_id) {
if (own_key_id != null) {
try {
own_key = GPGHelper.get_private_key(own_key_id);
if (own_key == null) print("PRIV KEY NULL\n");
} catch (Error e) { }
if (own_key != null) {
signed_status = gpg_sign("", own_key);
get_sign_key(signed_status, "");
}
}
}
public bool encrypt(Message.Stanza message, string key_id) {
string? enc_body = gpg_encrypt(message.body, new string[] {key_id, own_key.fpr});
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 = get_sign_key(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? get_sign_key(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, Key key) {
string signed;
try {
signed = GPGHelper.sign(str, GPG.SigMode.CLEAR, key);
} 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; }
}
}
|
