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
|
/*
* Copyright (C) 2014-2015 Vincent Breitmoser <v.breitmoser@mugenguild.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.operations;
import android.annotation.TargetApi;
import android.content.ContentResolver;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.net.Uri;
import android.os.Build;
import android.os.ParcelFileDescriptor;
import android.support.annotation.NonNull;
import android.system.ErrnoException;
import android.system.Os;
import android.system.StructStat;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.operations.results.OperationResult.LogType;
import org.sufficientlysecure.keychain.operations.results.OperationResult.OperationLog;
import org.sufficientlysecure.keychain.operations.results.PgpSignEncryptResult;
import org.sufficientlysecure.keychain.operations.results.SignEncryptResult;
import org.sufficientlysecure.keychain.pgp.PgpSignEncryptOperation;
import org.sufficientlysecure.keychain.pgp.Progressable;
import org.sufficientlysecure.keychain.pgp.SignEncryptParcel;
import org.sufficientlysecure.keychain.pgp.exception.PgpKeyNotFoundException;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
import org.sufficientlysecure.keychain.service.input.RequiredInputParcel;
import org.sufficientlysecure.keychain.service.input.RequiredInputParcel.NfcSignOperationsBuilder;
import org.sufficientlysecure.keychain.service.input.RequiredInputParcel.RequiredInputType;
import org.sufficientlysecure.keychain.util.FileHelper;
import org.sufficientlysecure.keychain.util.InputData;
import org.sufficientlysecure.keychain.util.Log;
import org.sufficientlysecure.keychain.util.ProgressScaler;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicBoolean;
import static android.system.OsConstants.S_IFMT;
import static android.system.OsConstants.S_IROTH;
/**
* This is a high-level operation, which encapsulates one or more sign/encrypt
* operations, using URIs or byte arrays as input and output.
*
* This operation is fail-fast: If any sign/encrypt sub-operation fails or returns
* a pending result, it will terminate.
*/
public class SignEncryptOperation extends BaseOperation<SignEncryptParcel> {
public SignEncryptOperation(Context context, ProviderHelper providerHelper,
Progressable progressable, AtomicBoolean cancelled) {
super(context, providerHelper, progressable, cancelled);
}
/**
* Tests whether a file is readable by others
*/
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public static boolean S_IROTH(int mode) {
return (mode & S_IROTH) == S_IROTH;
}
/**
* A replacement for ContentResolver.openInputStream() that does not allow the usage of
* "file" Uris that point to private files owned by the application only.
*
* This is not allowed:
* am start -a android.intent.action.SEND -t text/plain -n
* "org.sufficientlysecure.keychain.debug/org.sufficientlysecure.keychain.ui.EncryptFilesActivity" --eu
* android.intent.extra.STREAM
* file:///data/data/org.sufficientlysecure.keychain.debug/databases/openkeychain.db
*
* @throws FileNotFoundException
*/
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private InputStream openInputStreamSafe(ContentResolver resolver, Uri uri)
throws FileNotFoundException {
// Not supported on Android < 5
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
return resolver.openInputStream(uri);
}
String scheme = uri.getScheme();
if (ContentResolver.SCHEME_FILE.equals(scheme)) {
ParcelFileDescriptor pfd = ParcelFileDescriptor.open(
new File(uri.getPath()), ParcelFileDescriptor.parseMode("r"));
try {
final StructStat st = Os.fstat(pfd.getFileDescriptor());
if (!S_IROTH(st.st_mode)) {
Log.e(Constants.TAG, "File is not readable by others, aborting!");
throw new FileNotFoundException("Unable to create stream");
}
} catch (ErrnoException e) {
Log.e(Constants.TAG, "fstat() failed: " + e);
throw new FileNotFoundException("fstat() failed");
}
AssetFileDescriptor fd = new AssetFileDescriptor(pfd, 0, -1);
try {
return fd.createInputStream();
} catch (IOException e) {
throw new FileNotFoundException("Unable to create stream");
}
} else {
return resolver.openInputStream(uri);
}
}
@NonNull
public SignEncryptResult execute(SignEncryptParcel input, CryptoInputParcel cryptoInput) {
OperationLog log = new OperationLog();
log.add(LogType.MSG_SE, 0);
ArrayDeque<Uri> inputUris = new ArrayDeque<>(input.getInputUris());
ArrayDeque<Uri> outputUris = new ArrayDeque<>(input.getOutputUris());
byte[] inputBytes = input.getBytes();
byte[] outputBytes = null;
int total = inputBytes != null ? 1 : inputUris.size(), count = 0;
ArrayList<PgpSignEncryptResult> results = new ArrayList<>();
NfcSignOperationsBuilder pendingInputBuilder = null;
// if signing subkey has not explicitly been set, get first usable subkey capable of signing
if (input.getSignatureMasterKeyId() != Constants.key.none
&& input.getSignatureSubKeyId() == null) {
try {
long signKeyId = mProviderHelper.getCachedPublicKeyRing(
input.getSignatureMasterKeyId()).getSecretSignId();
input.setSignatureSubKeyId(signKeyId);
} catch (PgpKeyNotFoundException e) {
Log.e(Constants.TAG, "Key not found", e);
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
}
do {
if (checkCancelled()) {
log.add(LogType.MSG_OPERATION_CANCELLED, 0);
return new SignEncryptResult(SignEncryptResult.RESULT_CANCELLED, log, results);
}
InputData inputData;
{
if (inputBytes != null) {
log.add(LogType.MSG_SE_INPUT_BYTES, 1);
InputStream is = new ByteArrayInputStream(inputBytes);
inputData = new InputData(is, inputBytes.length);
inputBytes = null;
} else {
if (inputUris.isEmpty()) {
log.add(LogType.MSG_SE_ERROR_NO_INPUT, 1);
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
log.add(LogType.MSG_SE_INPUT_URI, 1);
Uri uri = inputUris.removeFirst();
try {
InputStream is = openInputStreamSafe(mContext.getContentResolver(), uri);
long fileSize = FileHelper.getFileSize(mContext, uri, 0);
String filename = FileHelper.getFilename(mContext, uri);
inputData = new InputData(is, fileSize, filename);
} catch (FileNotFoundException e) {
log.add(LogType.MSG_SE_ERROR_INPUT_URI_NOT_FOUND, 1);
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
}
}
OutputStream outStream;
{
if (!outputUris.isEmpty()) {
try {
Uri outputUri = outputUris.removeFirst();
outStream = mContext.getContentResolver().openOutputStream(outputUri);
} catch (FileNotFoundException e) {
log.add(LogType.MSG_SE_ERROR_OUTPUT_URI_NOT_FOUND, 1);
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
} else {
if (outputBytes != null) {
log.add(LogType.MSG_SE_ERROR_TOO_MANY_INPUTS, 1);
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
outStream = new ByteArrayOutputStream();
}
}
PgpSignEncryptOperation op = new PgpSignEncryptOperation(mContext, mProviderHelper,
new ProgressScaler(mProgressable, 100 * count / total, 100 * ++count / total, 100), mCancelled);
PgpSignEncryptResult result = op.execute(input, cryptoInput, inputData, outStream);
results.add(result);
log.add(result, 2);
if (result.isPending()) {
RequiredInputParcel requiredInput = result.getRequiredInputParcel();
// Passphrase returns immediately, nfc are aggregated
if (requiredInput.mType == RequiredInputType.PASSPHRASE) {
return new SignEncryptResult(log, requiredInput, results, cryptoInput);
}
if (pendingInputBuilder == null) {
pendingInputBuilder = new NfcSignOperationsBuilder(requiredInput.mSignatureTime,
input.getSignatureMasterKeyId(), input.getSignatureSubKeyId());
}
pendingInputBuilder.addAll(requiredInput);
} else if (!result.success()) {
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
if (outStream instanceof ByteArrayOutputStream) {
outputBytes = ((ByteArrayOutputStream) outStream).toByteArray();
}
} while (!inputUris.isEmpty());
if (pendingInputBuilder != null && !pendingInputBuilder.isEmpty()) {
return new SignEncryptResult(log, pendingInputBuilder.build(), results, cryptoInput);
}
if (!outputUris.isEmpty()) {
throw new AssertionError("Got outputs left but no inputs. This is a programming error, please report!");
}
log.add(LogType.MSG_SE_SUCCESS, 1);
return new SignEncryptResult(SignEncryptResult.RESULT_OK, log, results, outputBytes);
}
}
|
