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
|
/*
* Policies
* (C) 2004-2006 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#ifndef BOTAN_TLS_POLICY_H__
#define BOTAN_TLS_POLICY_H__
#include <botan/tls_version.h>
#include <botan/x509cert.h>
#include <botan/dl_group.h>
#include <vector>
namespace Botan {
namespace TLS {
/**
* TLS Policy Base Class
* Inherit and overload as desired to suit local policy concerns
*/
class BOTAN_DLL Policy
{
public:
/**
* Returns a list of ciphers we are willing to negotiate, in
* order of preference. Allowed values: any block cipher name, or
* ARC4.
*/
virtual std::vector<std::string> allowed_ciphers() const;
/**
* Returns a list of hash algorithms we are willing to use for
* signatures.
*/
virtual std::vector<std::string> allowed_signature_hashes() const;
/**
* Returns a list of MAC algorithms we are willing to use.
*/
virtual std::vector<std::string> allowed_macs() const;
/**
* Returns a list of key exchange algorithms we are willing to
* use, in order of preference. Allowed values: DH, empty string
* (representing RSA using server certificate key)
*/
virtual std::vector<std::string> allowed_key_exchange_methods() const;
/**
* Returns a list of signature algorithms we are willing to
* use, in order of preference. Allowed values RSA and DSA.
*/
virtual std::vector<std::string> allowed_signature_methods() const;
/**
* Return list of ECC curves we are willing to use in order of preference
*/
virtual std::vector<std::string> allowed_ecc_curves() const;
/**
* Returns a list of compression algorithms we are willing to use,
* in order of preference. Allowed values any value of
* Compression_Method.
*
* @note Compression is not currently supported
*/
virtual std::vector<byte> compression() const;
/**
* Choose an elliptic curve to use
*/
virtual std::string choose_curve(const std::vector<std::string>& curve_names) const;
/**
* Attempt to negotiate the use of the heartbeat extension
*/
virtual bool negotiate_heartbeat_support() const { return false; }
/**
* Allow renegotiation even if the counterparty doesn't
* support the secure renegotiation extension.
*
* @warning Changing this to true exposes you to injected
* plaintext attacks. Read RFC 5746 for background.
*/
virtual bool allow_insecure_renegotiation() const { return false; }
/**
* Allow servers to initiate a new handshake
*/
virtual bool allow_server_initiated_renegotiation() const { return true; }
/**
* Return the group to use for ephemeral Diffie-Hellman key agreement
*/
virtual DL_Group dh_group() const;
/**
* Return the minimum DH group size we're willing to use
*/
virtual size_t minimum_dh_group_size() const;
/**
* If this function returns false, unknown SRP/PSK identifiers
* will be rejected with an unknown_psk_identifier alert as soon
* as the non-existence is identified. Otherwise, a false
* identifier value will be used and the protocol allowed to
* proceed, causing the handshake to eventually fail without
* revealing that the username does not exist on this system.
*/
virtual bool hide_unknown_users() const { return false; }
/**
* Return the allowed lifetime of a session ticket. If 0, session
* tickets do not expire until the session ticket key rolls over.
* Expired session tickets cannot be used to resume a session.
*/
virtual u32bit session_ticket_lifetime() const;
/**
* @return true if and only if we are willing to accept this version
*/
virtual bool acceptable_protocol_version(Protocol_Version version) const;
/**
* @return true if servers should choose the ciphersuite matching
* their highest preference, rather than the clients.
* Has no effect on client side.
*/
virtual bool server_uses_own_ciphersuite_preferences() const;
virtual ~Policy() {}
};
/**
* Return allowed ciphersuites, in order of preference
*/
std::vector<u16bit> ciphersuite_list(const Policy& policy,
Protocol_Version version,
bool have_srp);
}
}
#endif
|
