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
|
#include "encryptionmanager.h"
#include "connection.h"
#include "e2ee.h"
#include "csapi/keys.h"
#include <QtCore/QHash>
#include <QtCore/QStringBuilder>
#include <account.h> // QtOlm
#include <functional>
#include <memory>
using namespace QMatrixClient;
using namespace QtOlm;
using std::move;
class EncryptionManager::Private {
public:
explicit Private(const QByteArray& encryptionAccountPickle,
float signedKeysProportion, float oneTimeKeyThreshold)
: signedKeysProportion(move(signedKeysProportion))
, oneTimeKeyThreshold(move(oneTimeKeyThreshold))
{
Q_ASSERT((0 <= signedKeysProportion) && (signedKeysProportion <= 1));
Q_ASSERT((0 <= oneTimeKeyThreshold) && (oneTimeKeyThreshold <= 1));
if (encryptionAccountPickle.isEmpty()) {
olmAccount.reset(new Account());
} else {
olmAccount.reset(
new Account(encryptionAccountPickle)); // TODO: passphrase even
// with qtkeychain?
}
/*
* Note about targetKeysNumber:
*
* From: https://github.com/Zil0/matrix-python-sdk/
* File: matrix_client/crypto/olm_device.py
*
* Try to maintain half the number of one-time keys libolm can hold
* uploaded on the HS. This is because some keys will be claimed by
* peers but not used instantly, and we want them to stay in libolm,
* until the limit is reached and it starts discarding keys, starting by
* the oldest.
*/
targetKeysNumber = olmAccount->maxOneTimeKeys(); // 2 // see note below
targetOneTimeKeyCounts = {
{ SignedCurve25519Key,
qRound(signedKeysProportion * targetKeysNumber) },
{ Curve25519Key,
qRound((1 - signedKeysProportion) * targetKeysNumber) }
};
}
~Private() = default;
UploadKeysJob* uploadIdentityKeysJob = nullptr;
UploadKeysJob* uploadOneTimeKeysJob = nullptr;
QScopedPointer<Account> olmAccount;
float signedKeysProportion;
float oneTimeKeyThreshold;
int targetKeysNumber;
void updateKeysToUpload();
bool oneTimeKeyShouldUpload();
QHash<QString, int> oneTimeKeyCounts;
void setOneTimeKeyCounts(const QHash<QString, int> oneTimeKeyCountsNewValue)
{
oneTimeKeyCounts = oneTimeKeyCountsNewValue;
updateKeysToUpload();
}
QHash<QString, int> oneTimeKeysToUploadCounts;
QHash<QString, int> targetOneTimeKeyCounts;
};
EncryptionManager::EncryptionManager(const QByteArray& encryptionAccountPickle,
float signedKeysProportion,
float oneTimeKeyThreshold, QObject* parent)
: QObject(parent)
, d(std::make_unique<Private>(std::move(encryptionAccountPickle),
std::move(signedKeysProportion),
std::move(oneTimeKeyThreshold)))
{}
EncryptionManager::~EncryptionManager() = default;
void EncryptionManager::uploadIdentityKeys(Connection* connection)
{
// https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-keys-upload
DeviceKeys deviceKeys {
/*
* The ID of the user the device belongs to. Must match the user ID used
* when logging in. The ID of the device these keys belong to. Must
* match the device ID used when logging in. The encryption algorithms
* supported by this device.
*/
connection->userId(),
connection->deviceId(),
SupportedAlgorithms,
/*
* Public identity keys. The names of the properties should be in the
* format <algorithm>:<device_id>. The keys themselves should be encoded
* as specified by the key algorithm.
*/
{ { Curve25519Key + QStringLiteral(":") + connection->deviceId(),
d->olmAccount->curve25519IdentityKey() },
{ Ed25519Key + QStringLiteral(":") + connection->deviceId(),
d->olmAccount->ed25519IdentityKey() } },
/* signatures should be provided after the unsigned deviceKeys
generation */
{}
};
QJsonObject deviceKeysJsonObject = toJson(deviceKeys);
/* additionally removing signatures key,
* since we could not initialize deviceKeys
* without an empty signatures value:
*/
deviceKeysJsonObject.remove(QStringLiteral("signatures"));
/*
* Signatures for the device key object.
* A map from user ID, to a map from <algorithm>:<device_id> to the
* signature. The signature is calculated using the process called Signing
* JSON.
*/
deviceKeys.signatures = {
{ connection->userId(),
{ { Ed25519Key + QStringLiteral(":") + connection->deviceId(),
d->olmAccount->sign(deviceKeysJsonObject) } } }
};
connect(d->uploadIdentityKeysJob, &BaseJob::success, this, [this] {
d->setOneTimeKeyCounts(d->uploadIdentityKeysJob->oneTimeKeyCounts());
qDebug() << QString("Uploaded identity keys.");
});
d->uploadIdentityKeysJob = connection->callApi<UploadKeysJob>(deviceKeys);
}
void EncryptionManager::uploadOneTimeKeys(Connection* connection,
bool forceUpdate)
{
if (forceUpdate || d->oneTimeKeyCounts.isEmpty()) {
auto job = connection->callApi<UploadKeysJob>();
connect(job, &BaseJob::success, this, [job, this] {
d->setOneTimeKeyCounts(job->oneTimeKeyCounts());
});
}
int signedKeysToUploadCount =
d->oneTimeKeysToUploadCounts.value(SignedCurve25519Key, 0);
int unsignedKeysToUploadCount =
d->oneTimeKeysToUploadCounts.value(Curve25519Key, 0);
d->olmAccount->generateOneTimeKeys(signedKeysToUploadCount
+ unsignedKeysToUploadCount);
QHash<QString, QVariant> oneTimeKeys = {};
const auto& olmAccountCurve25519OneTimeKeys =
d->olmAccount->curve25519OneTimeKeys();
int oneTimeKeysCounter = 0;
for (auto it = olmAccountCurve25519OneTimeKeys.cbegin();
it != olmAccountCurve25519OneTimeKeys.cend(); ++it) {
QString keyId = it.key();
QString keyType;
QVariant key;
if (oneTimeKeysCounter < signedKeysToUploadCount) {
QJsonObject message { { QStringLiteral("key"),
it.value().toString() } };
key = d->olmAccount->sign(message);
keyType = SignedCurve25519Key;
} else {
key = it.value();
keyType = Curve25519Key;
}
++oneTimeKeysCounter;
oneTimeKeys.insert(QString("%1:%2").arg(keyType).arg(keyId), key);
}
d->uploadOneTimeKeysJob = connection->callApi<UploadKeysJob>(none,
oneTimeKeys);
d->olmAccount->markKeysAsPublished();
qDebug() << QString("Uploaded new one-time keys: %1 signed, %2 unsigned.")
.arg(signedKeysToUploadCount)
.arg(unsignedKeysToUploadCount);
}
QByteArray EncryptionManager::olmAccountPickle()
{
return d->olmAccount->pickle(); // TODO: passphrase even with qtkeychain?
}
QtOlm::Account* EncryptionManager::account() const
{
return d->olmAccount.data();
}
void EncryptionManager::Private::updateKeysToUpload()
{
for (auto it = targetOneTimeKeyCounts.cbegin();
it != targetOneTimeKeyCounts.cend(); ++it) {
int numKeys = oneTimeKeyCounts.value(it.key(), 0);
int numToCreate = qMax(it.value() - numKeys, 0);
oneTimeKeysToUploadCounts.insert(it.key(), numToCreate);
}
}
bool EncryptionManager::Private::oneTimeKeyShouldUpload()
{
if (oneTimeKeyCounts.empty())
return true;
for (auto it = targetOneTimeKeyCounts.cbegin();
it != targetOneTimeKeyCounts.cend(); ++it) {
if (oneTimeKeyCounts.value(it.key(), 0)
< it.value() * oneTimeKeyThreshold)
return true;
}
return false;
}
|
