aboutsummaryrefslogtreecommitdiffstats
path: root/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java
blob: 257d0f7e82e1d6a35490aa1e8f83a50834a0d599 (plain)
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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
package eu.siacs.conversations.crypto;

import android.app.PendingIntent;
import android.content.Intent;
import android.net.Uri;

import org.openintents.openpgp.OpenPgpSignatureResult;
import org.openintents.openpgp.util.OpenPgpApi;
import org.openintents.openpgp.util.OpenPgpApi.IOpenPgpCallback;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;

import eu.siacs.conversations.R;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Contact;
import eu.siacs.conversations.entities.Conversation;
import eu.siacs.conversations.entities.DownloadableFile;
import eu.siacs.conversations.entities.Message;
import eu.siacs.conversations.http.HttpConnectionManager;
import eu.siacs.conversations.services.XmppConnectionService;
import eu.siacs.conversations.ui.UiCallback;

public class PgpEngine {
	private OpenPgpApi api;
	private XmppConnectionService mXmppConnectionService;

	public PgpEngine(OpenPgpApi api, XmppConnectionService service) {
		this.api = api;
		this.mXmppConnectionService = service;
	}

	public void decrypt(final Message message,
			final UiCallback<Message> callback) {
		Intent params = new Intent();
		params.setAction(OpenPgpApi.ACTION_DECRYPT_VERIFY);
		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, message
				.getConversation().getAccount().getJid().toBareJid().toString());
		if (message.getType() == Message.TYPE_TEXT) {
			InputStream is = new ByteArrayInputStream(message.getBody()
					.getBytes());
			final OutputStream os = new ByteArrayOutputStream();
			api.executeApiAsync(params, is, os, new IOpenPgpCallback() {

				@Override
				public void onReturn(Intent result) {
					notifyPgpDecryptionService(message.getContact().getAccount(), OpenPgpApi.ACTION_DECRYPT_VERIFY, result);
					switch (result.getIntExtra(OpenPgpApi.RESULT_CODE,
							OpenPgpApi.RESULT_CODE_ERROR)) {
					case OpenPgpApi.RESULT_CODE_SUCCESS:
						try {
							os.flush();
							if (message.getEncryption() == Message.ENCRYPTION_PGP) {
								message.setBody(os.toString());
								message.setEncryption(Message.ENCRYPTION_DECRYPTED);
								final HttpConnectionManager manager = mXmppConnectionService.getHttpConnectionManager();
								if (message.trusted()
										&& message.treatAsDownloadable() != Message.Decision.NEVER
										&& manager.getAutoAcceptFileSize() > 0) {
									manager.createNewDownloadConnection(message);
								}
								mXmppConnectionService.updateMessage(message);
								callback.success(message);
							}
						} catch (IOException e) {
							callback.error(R.string.openpgp_error, message);
							return;
						}

						return;
					case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
						callback.userInputRequried((PendingIntent) result
								.getParcelableExtra(OpenPgpApi.RESULT_INTENT),
								message);
						return;
					case OpenPgpApi.RESULT_CODE_ERROR:
						callback.error(R.string.openpgp_error, message);
                    }
				}
			});
		} else if (message.getType() == Message.TYPE_IMAGE || message.getType() == Message.TYPE_FILE) {
			try {
				final DownloadableFile inputFile = this.mXmppConnectionService
						.getFileBackend().getFile(message, false);
				final DownloadableFile outputFile = this.mXmppConnectionService
						.getFileBackend().getFile(message, true);
				outputFile.getParentFile().mkdirs();
				outputFile.createNewFile();
				InputStream is = new FileInputStream(inputFile);
				OutputStream os = new FileOutputStream(outputFile);
				api.executeApiAsync(params, is, os, new IOpenPgpCallback() {

					@Override
					public void onReturn(Intent result) {
						switch (result.getIntExtra(OpenPgpApi.RESULT_CODE,
								OpenPgpApi.RESULT_CODE_ERROR)) {
						case OpenPgpApi.RESULT_CODE_SUCCESS:
							URL url = message.getFileParams().url;
							mXmppConnectionService.getFileBackend().updateFileParams(message,url);
							message.setEncryption(Message.ENCRYPTION_DECRYPTED);
							PgpEngine.this.mXmppConnectionService
									.updateMessage(message);
							inputFile.delete();
							Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
							intent.setData(Uri.fromFile(outputFile));
							mXmppConnectionService.sendBroadcast(intent);
							callback.success(message);
							return;
						case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
							callback.userInputRequried(
									(PendingIntent) result
											.getParcelableExtra(OpenPgpApi.RESULT_INTENT),
									message);
							return;
						case OpenPgpApi.RESULT_CODE_ERROR:
							callback.error(R.string.openpgp_error, message);
						}
					}
				});
			} catch (final IOException e) {
				callback.error(R.string.error_decrypting_file, message);
			}

		}
	}

	public void encrypt(final Message message,
			final UiCallback<Message> callback) {

		Intent params = new Intent();
		params.setAction(OpenPgpApi.ACTION_ENCRYPT);
		if (message.getConversation().getMode() == Conversation.MODE_SINGLE) {
			long[] keys = { message.getConversation().getContact()
					.getPgpKeyId() };
			params.putExtra(OpenPgpApi.EXTRA_KEY_IDS, keys);
		} else {
			params.putExtra(OpenPgpApi.EXTRA_KEY_IDS, message.getConversation()
					.getMucOptions().getPgpKeyIds());
		}
		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, message
				.getConversation().getAccount().getJid().toBareJid().toString());

		if (!message.needsUploading()) {
			params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
			String body;
			if (message.hasFileOnRemoteHost()) {
				body = message.getFileParams().url.toString();
			} else {
				body = message.getBody();
			}
			InputStream is = new ByteArrayInputStream(body.getBytes());
			final OutputStream os = new ByteArrayOutputStream();
			api.executeApiAsync(params, is, os, new IOpenPgpCallback() {

				@Override
				public void onReturn(Intent result) {
					notifyPgpDecryptionService(message.getContact().getAccount(), OpenPgpApi.ACTION_ENCRYPT, result);
					switch (result.getIntExtra(OpenPgpApi.RESULT_CODE,
							OpenPgpApi.RESULT_CODE_ERROR)) {
					case OpenPgpApi.RESULT_CODE_SUCCESS:
						try {
							os.flush();
							StringBuilder encryptedMessageBody = new StringBuilder();
							String[] lines = os.toString().split("\n");
							for (int i = 2; i < lines.length - 1; ++i) {
								if (!lines[i].contains("Version")) {
									encryptedMessageBody.append(lines[i].trim());
								}
							}
							message.setEncryptedBody(encryptedMessageBody
									.toString());
							callback.success(message);
						} catch (IOException e) {
							callback.error(R.string.openpgp_error, message);
						}

						break;
					case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
						callback.userInputRequried((PendingIntent) result
								.getParcelableExtra(OpenPgpApi.RESULT_INTENT),
								message);
						break;
					case OpenPgpApi.RESULT_CODE_ERROR:
						callback.error(R.string.openpgp_error, message);
						break;
					}
				}
			});
		} else {
			try {
				DownloadableFile inputFile = this.mXmppConnectionService
						.getFileBackend().getFile(message, true);
				DownloadableFile outputFile = this.mXmppConnectionService
						.getFileBackend().getFile(message, false);
				outputFile.getParentFile().mkdirs();
				outputFile.createNewFile();
				InputStream is = new FileInputStream(inputFile);
				OutputStream os = new FileOutputStream(outputFile);
				api.executeApiAsync(params, is, os, new IOpenPgpCallback() {

					@Override
					public void onReturn(Intent result) {
						notifyPgpDecryptionService(message.getContact().getAccount(), OpenPgpApi.ACTION_ENCRYPT, result);
						switch (result.getIntExtra(OpenPgpApi.RESULT_CODE,
								OpenPgpApi.RESULT_CODE_ERROR)) {
						case OpenPgpApi.RESULT_CODE_SUCCESS:
							callback.success(message);
							break;
						case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
							callback.userInputRequried(
									(PendingIntent) result
											.getParcelableExtra(OpenPgpApi.RESULT_INTENT),
									message);
							break;
						case OpenPgpApi.RESULT_CODE_ERROR:
							callback.error(R.string.openpgp_error, message);
							break;
						}
					}
				});
			} catch (final IOException e) {
				callback.error(R.string.openpgp_error, message);
			}
		}
	}

	public long fetchKeyId(Account account, String status, String signature) {
		if ((signature == null) || (api == null)) {
			return 0;
		}
		if (status == null) {
			status = "";
		}
		final StringBuilder pgpSig = new StringBuilder();
		pgpSig.append("-----BEGIN PGP SIGNED MESSAGE-----");
		pgpSig.append('\n');
		pgpSig.append('\n');
		pgpSig.append(status);
		pgpSig.append('\n');
		pgpSig.append("-----BEGIN PGP SIGNATURE-----");
		pgpSig.append('\n');
		pgpSig.append('\n');
		pgpSig.append(signature.replace("\n", "").trim());
		pgpSig.append('\n');
		pgpSig.append("-----END PGP SIGNATURE-----");
		Intent params = new Intent();
		params.setAction(OpenPgpApi.ACTION_DECRYPT_VERIFY);
		params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, account.getJid().toBareJid().toString());
		InputStream is = new ByteArrayInputStream(pgpSig.toString().getBytes());
		ByteArrayOutputStream os = new ByteArrayOutputStream();
		Intent result = api.executeApi(params, is, os);
		notifyPgpDecryptionService(account, OpenPgpApi.ACTION_DECRYPT_VERIFY, result);
		switch (result.getIntExtra(OpenPgpApi.RESULT_CODE,
				OpenPgpApi.RESULT_CODE_ERROR)) {
		case OpenPgpApi.RESULT_CODE_SUCCESS:
			OpenPgpSignatureResult sigResult = result
					.getParcelableExtra(OpenPgpApi.RESULT_SIGNATURE);
			if (sigResult != null) {
				return sigResult.getKeyId();
			} else {
				return 0;
			}
		case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
			return 0;
		case OpenPgpApi.RESULT_CODE_ERROR:
			return 0;
		}
		return 0;
	}

	public void generateSignature(final Account account, String status,
			final UiCallback<Account> callback) {
		Intent params = new Intent();
		params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
		params.setAction(OpenPgpApi.ACTION_SIGN);
		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, account.getJid().toBareJid().toString());
		InputStream is = new ByteArrayInputStream(status.getBytes());
		final OutputStream os = new ByteArrayOutputStream();
		api.executeApiAsync(params, is, os, new IOpenPgpCallback() {

			@Override
			public void onReturn(Intent result) {
				notifyPgpDecryptionService(account, OpenPgpApi.ACTION_SIGN, result);
				switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, 0)) {
				case OpenPgpApi.RESULT_CODE_SUCCESS:
					StringBuilder signatureBuilder = new StringBuilder();
					try {
						os.flush();
						String[] lines = os.toString().split("\n");
						boolean sig = false;
						for (String line : lines) {
							if (sig) {
								if (line.contains("END PGP SIGNATURE")) {
									sig = false;
								} else {
									if (!line.contains("Version")) {
										signatureBuilder.append(line.trim());
									}
								}
							}
							if (line.contains("BEGIN PGP SIGNATURE")) {
								sig = true;
							}
						}
					} catch (IOException e) {
						callback.error(R.string.openpgp_error, account);
						return;
					}
					account.setKey("pgp_signature", signatureBuilder.toString());
					callback.success(account);
					return;
				case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
					callback.userInputRequried((PendingIntent) result
							.getParcelableExtra(OpenPgpApi.RESULT_INTENT),
							account);
					return;
				case OpenPgpApi.RESULT_CODE_ERROR:
					callback.error(R.string.openpgp_error, account);
                }
			}
		});
	}

	public void hasKey(final Contact contact, final UiCallback<Contact> callback) {
		Intent params = new Intent();
		params.setAction(OpenPgpApi.ACTION_GET_KEY);
		params.putExtra(OpenPgpApi.EXTRA_KEY_ID, contact.getPgpKeyId());
		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, contact.getAccount()
				.getJid().toBareJid().toString());
		api.executeApiAsync(params, null, null, new IOpenPgpCallback() {

			@Override
			public void onReturn(Intent result) {
				switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, 0)) {
				case OpenPgpApi.RESULT_CODE_SUCCESS:
					callback.success(contact);
					return;
				case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
					callback.userInputRequried((PendingIntent) result
							.getParcelableExtra(OpenPgpApi.RESULT_INTENT),
							contact);
					return;
				case OpenPgpApi.RESULT_CODE_ERROR:
					callback.error(R.string.openpgp_error, contact);
                }
			}
		});
	}

	public PendingIntent getIntentForKey(Contact contact) {
		Intent params = new Intent();
		params.setAction(OpenPgpApi.ACTION_GET_KEY);
		params.putExtra(OpenPgpApi.EXTRA_KEY_ID, contact.getPgpKeyId());
		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, contact.getAccount()
				.getJid().toBareJid().toString());
		Intent result = api.executeApi(params, null, null);
		return (PendingIntent) result
				.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
	}

	public PendingIntent getIntentForKey(Account account, long pgpKeyId) {
		Intent params = new Intent();
		params.setAction(OpenPgpApi.ACTION_GET_KEY);
		params.putExtra(OpenPgpApi.EXTRA_KEY_ID, pgpKeyId);
		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, account.getJid().toBareJid().toString());
		Intent result = api.executeApi(params, null, null);
		return (PendingIntent) result
				.getParcelableExtra(OpenPgpApi.RESULT_INTENT);
	}

	private void notifyPgpDecryptionService(Account account, String action, final Intent result) {
		switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, 0)) {
			case OpenPgpApi.RESULT_CODE_SUCCESS:
				if (OpenPgpApi.ACTION_SIGN.equals(action)) {
					account.getPgpDecryptionService().onKeychainUnlocked();
				}
				break;
			case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
				account.getPgpDecryptionService().onKeychainLocked();
				break;
		}
	}
}