summaryrefslogtreecommitdiff
path: root/src/mongo/db/logical_time_validator.h
blob: b87ff47436ec41b758c1b39462132dc438a6cc3c (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
/**
 *    Copyright (C) 2018-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    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
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    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 Server Side 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.
 */

#pragma once

#include <memory>

#include "mongo/db/signed_logical_time.h"
#include "mongo/db/time_proof_service.h"
#include "mongo/stdx/mutex.h"

namespace mongo {

class OperationContext;
class ServiceContext;
class KeysCollectionDocument;
class KeysCollectionManager;

/**
 * This is responsible for signing cluster times that can be used to sent to other servers and
 * verifying signatures of signed cluster times.
 */
class LogicalTimeValidator {
public:
    // Decorate ServiceContext with LogicalTimeValidator instance.
    static LogicalTimeValidator* get(ServiceContext* service);
    static LogicalTimeValidator* get(OperationContext* ctx);
    static void set(ServiceContext* service, std::unique_ptr<LogicalTimeValidator> validator);

    /**
     * Constructs a new LogicalTimeValidator that uses the given key manager. The passed-in
     * key manager must outlive this object.
     */
    explicit LogicalTimeValidator(std::shared_ptr<KeysCollectionManager> keyManager);

    /**
     * Tries to sign the newTime with a valid signature. Can return an empty signature and keyId
     * of 0 if it cannot find valid key for newTime.
     */
    SignedLogicalTime trySignLogicalTime(const LogicalTime& newTime);

    /**
     * Returns the newTime with a valid signature.
     */
    SignedLogicalTime signLogicalTime(OperationContext* opCtx, const LogicalTime& newTime);

    /**
     * Returns true if the signature of newTime is valid.
     */
    Status validate(OperationContext* opCtx, const SignedLogicalTime& newTime);

    /**
     * Initializes this validator. This should be called first before the other methods can be used.
     */
    void init(ServiceContext* service);

    /**
     * Cleans up this validator. This will no longer be usable after this is called.
     */
    void shutDown();

    /**
     * Enable writing new keys to the config server primary. Should only be called if current node
     * is the config primary.
     */
    void enableKeyGenerator(OperationContext* opCtx, bool doEnable);

    /**
     * Returns true if client has sufficient privilege to advance clock.
     */
    static bool isAuthorizedToAdvanceClock(OperationContext* opCtx);

    /**
     * Returns true if the server should gossip, sign, and validate cluster times. False until there
     * are keys in the config server.
     */
    bool shouldGossipLogicalTime();

    /**
     * Stops the key manager and resets its state to prevent the former members of standalone
     * replica set to use old keys with sharded cluster.
     */
    void stopKeyManager();

    /**
     * Reset the key manager cache of keys.
     */
    void resetKeyManagerCache();

private:
    /**
     *  Returns the copy of the _keyManager to work when its reset by resetKeyManager call.
     */
    std::shared_ptr<KeysCollectionManager> _getKeyManagerCopy();


    SignedLogicalTime _getProof(const KeysCollectionDocument& keyDoc, LogicalTime newTime);

    stdx::mutex _mutex;            // protects _lastSeenValidTime
    stdx::mutex _mutexKeyManager;  // protects _keyManager
    SignedLogicalTime _lastSeenValidTime;
    TimeProofService _timeProofService;
    std::shared_ptr<KeysCollectionManager> _keyManager;
};

}  // namespace mongo