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
|
/**
* Copyright (C) 2017 MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/key_generator.h"
#include "mongo/client/read_preference.h"
#include "mongo/db/keys_collection_client.h"
#include "mongo/db/logical_clock.h"
#include "mongo/db/operation_context.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/util/fail_point_service.h"
namespace mongo {
namespace {
MONGO_FAIL_POINT_DEFINE(disableKeyGeneration);
/**
* Inserts a new key to the keys collection.
*
* Note: this relies on the fact that ShardRegistry returns a ShardLocal for config in config
* servers. In other words, it is relying on the fact that this will always execute the write
* locally and never remotely even if this node is no longer primary.
*/
Status insertNewKey(OperationContext* opCtx,
KeysCollectionClient* client,
long long keyId,
const std::string& purpose,
const LogicalTime& expiresAt) {
KeysCollectionDocument newKey(keyId, purpose, TimeProofService::generateRandomKey(), expiresAt);
return client->insertNewKey(opCtx, newKey.toBSON());
}
/**
* Returns a new LogicalTime with the seconds argument added to it.
*/
LogicalTime addSeconds(const LogicalTime& logicalTime, const Seconds& seconds) {
return LogicalTime(Timestamp(logicalTime.asTimestamp().getSecs() + seconds.count(), 0));
}
} // unnamed namespace
KeyGenerator::KeyGenerator(std::string purpose,
KeysCollectionClient* client,
Seconds keyValidForInterval)
: _client(client), _purpose(std::move(purpose)), _keyValidForInterval(keyValidForInterval) {}
Status KeyGenerator::generateNewKeysIfNeeded(OperationContext* opCtx) {
if (MONGO_FAIL_POINT(disableKeyGeneration)) {
return {ErrorCodes::FailPointEnabled, "key generation disabled"};
}
auto currentTime = LogicalClock::get(opCtx)->getClusterTime();
auto keyStatus = _client->getNewKeys(opCtx, _purpose, currentTime);
if (!keyStatus.isOK()) {
return keyStatus.getStatus();
}
const auto& newKeys = keyStatus.getValue();
auto keyIter = newKeys.cbegin();
LogicalTime currentKeyExpiresAt;
long long keyId = currentTime.asTimestamp().asLL();
if (keyIter == newKeys.cend()) {
currentKeyExpiresAt = addSeconds(currentTime, _keyValidForInterval);
auto status = insertNewKey(opCtx, _client, keyId, _purpose, currentKeyExpiresAt);
if (!status.isOK()) {
return status;
}
keyId++;
} else if (keyIter->getExpiresAt() < currentTime) {
currentKeyExpiresAt = addSeconds(currentTime, _keyValidForInterval);
auto status = insertNewKey(opCtx, _client, keyId, _purpose, currentKeyExpiresAt);
if (!status.isOK()) {
return status;
}
keyId++;
++keyIter;
} else {
currentKeyExpiresAt = keyIter->getExpiresAt();
++keyIter;
}
// Create a new key in advance if we don't have a key on standby after the current one
// expires.
// Note: Convert this block into a loop if more reserved keys are desired.
if (keyIter == newKeys.cend()) {
auto reserveKeyExpiresAt = addSeconds(currentKeyExpiresAt, _keyValidForInterval);
auto status = insertNewKey(opCtx, _client, keyId, _purpose, reserveKeyExpiresAt);
if (!status.isOK()) {
return status;
}
} else if (keyIter->getExpiresAt() < currentTime) {
currentKeyExpiresAt = addSeconds(currentKeyExpiresAt, _keyValidForInterval);
auto status = insertNewKey(opCtx, _client, keyId, _purpose, currentKeyExpiresAt);
if (!status.isOK()) {
return status;
}
}
return Status::OK();
}
} // namespace mongo
|
