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
|
/**
* 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 <functional>
#include <memory>
#include <string>
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
namespace mongo {
/**
* Base class for the client side of a SASL authentication conversation.
*
* To use, create an instance, then use setParameter() to configure the authentication
* parameters. Once all parameters are set, call initialize() to initialize the client state
* machine. Finally, use repeated calls to step() to generate messages to send to the server
* and process server responses.
*
* The required parameters vary by mechanism, but all mechanisms require parameterServiceName,
* parameterServiceHostname, parameterMechanism and parameterUser. All of the required
* parameters must be UTF-8 encoded strings with no embedded NUL characters. The
* parameterPassword parameter is not constrained.
*/
class SaslClientSession {
SaslClientSession(const SaslClientSession&) = delete;
SaslClientSession& operator=(const SaslClientSession&) = delete;
public:
typedef std::function<SaslClientSession*(const std::string&)> SaslClientSessionFactoryFn;
static SaslClientSessionFactoryFn create;
/**
* Identifiers of parameters used to configure a SaslClientSession.
*/
enum Parameter {
parameterServiceName = 0,
parameterServiceHostname,
parameterServiceHostAndPort,
parameterMechanism,
parameterUser,
parameterPassword,
parameterAWSSessionToken,
numParameters // Must be last
};
SaslClientSession();
virtual ~SaslClientSession();
/**
* Sets the parameter identified by "id" to "value".
*
* The value of "id" must be one of the legal values of Parameter less than numParameters.
* May be called repeatedly for the same value of "id", with the last "value" replacing
* previous values.
*
* The session object makes and owns a copy of the data in "value".
*/
virtual void setParameter(Parameter id, StringData value);
/**
* Returns true if "id" identifies a parameter previously set by a call to setParameter().
*/
virtual bool hasParameter(Parameter id);
/**
* Returns the value of a previously set parameter.
*
* If parameter "id" was never set, returns an empty StringData. Note that a parameter may
* be explicitly set to StringData(), so use hasParameter() to distinguish those cases.
*
* The session object owns the storage behind the returned StringData, which will remain
* valid until setParameter() is called with the same value of "id", or the session object
* goes out of scope.
*/
virtual StringData getParameter(Parameter id);
/**
* Initializes a session for use.
*
* Call exactly once, after setting any parameters you intend to set via setParameter().
*/
virtual Status initialize() = 0;
/**
* Takes one step of the SASL protocol on behalf of the client.
*
* Caller should provide data from the server side of the conversation in "inputData", or an
* empty StringData() if none is available. If the client should make a response to the
* server, stores the response into "*outputData".
*
* Returns Status::OK() on success. Any other return value indicates a failed
* authentication, though the specific return value may provide insight into the cause of
* the failure (e.g., ProtocolError, AuthenticationFailed).
*
* In the event that this method does not return Status::OK(), authentication has failed.
* When step() returns Status::OK() and isSuccess() returns true,
* authentication has completed successfully.
*/
virtual Status step(StringData inputData, std::string* outputData) = 0;
/**
* Returns true if the authentication completed successfully.
*/
virtual bool isSuccess() const = 0;
private:
/**
* Buffer object that owns data for a single parameter.
*/
struct DataBuffer {
std::unique_ptr<char[]> data;
size_t size;
};
/// Buffers for each of the settable parameters.
DataBuffer _parameters[numParameters];
};
} // namespace mongo
|
