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
|
;/*
* TLS Server Hello and Server Hello Done
* (C) 2004-2011 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#include <botan/internal/tls_messages.h>
#include <botan/internal/tls_reader.h>
#include <botan/internal/tls_session_key.h>
#include <botan/internal/tls_extensions.h>
#include <botan/tls_record.h>
#include <botan/internal/stl_util.h>
namespace Botan {
namespace TLS {
/*
* Create a new Server Hello message
*/
Server_Hello::Server_Hello(Record_Writer& writer,
Handshake_Hash& hash,
Protocol_Version version,
const Client_Hello& c_hello,
const std::vector<std::string>& available_cert_types,
const Policy& policy,
bool client_has_secure_renegotiation,
const MemoryRegion<byte>& reneg_info,
bool client_has_npn,
const std::vector<std::string>& next_protocols,
RandomNumberGenerator& rng) :
s_version(version),
m_session_id(rng.random_vec(32)),
s_random(make_hello_random(rng)),
m_fragment_size(c_hello.fragment_size()),
m_secure_renegotiation(client_has_secure_renegotiation),
m_renegotiation_info(reneg_info),
m_next_protocol(client_has_npn),
m_next_protocols(next_protocols)
{
suite = policy.choose_suite(
c_hello.ciphersuites(),
available_cert_types,
policy.choose_curve(c_hello.supported_ecc_curves()) != "",
false);
if(suite == 0)
throw TLS_Exception(Alert::HANDSHAKE_FAILURE,
"Can't agree on a ciphersuite with client");
comp_method = policy.choose_compression(c_hello.compression_methods());
hash.update(writer.send(*this));
}
/*
* Create a new Server Hello message
*/
Server_Hello::Server_Hello(Record_Writer& writer,
Handshake_Hash& hash,
const MemoryRegion<byte>& session_id,
Protocol_Version ver,
u16bit ciphersuite,
byte compression,
size_t max_fragment_size,
bool client_has_secure_renegotiation,
const MemoryRegion<byte>& reneg_info,
bool client_has_npn,
const std::vector<std::string>& next_protocols,
RandomNumberGenerator& rng) :
s_version(ver),
m_session_id(session_id),
s_random(make_hello_random(rng)),
suite(ciphersuite),
comp_method(compression),
m_fragment_size(max_fragment_size),
m_secure_renegotiation(client_has_secure_renegotiation),
m_renegotiation_info(reneg_info),
m_next_protocol(client_has_npn),
m_next_protocols(next_protocols)
{
hash.update(writer.send(*this));
}
/*
* Deserialize a Server Hello message
*/
Server_Hello::Server_Hello(const MemoryRegion<byte>& buf)
{
m_secure_renegotiation = false;
m_next_protocol = false;
if(buf.size() < 38)
throw Decoding_Error("Server_Hello: Packet corrupted");
TLS_Data_Reader reader(buf);
const byte major_version = reader.get_byte();
const byte minor_version = reader.get_byte();
s_version = Protocol_Version(major_version, minor_version);
if(s_version != Protocol_Version::SSL_V3 &&
s_version != Protocol_Version::TLS_V10 &&
s_version != Protocol_Version::TLS_V11 &&
s_version != Protocol_Version::TLS_V12)
{
throw TLS_Exception(Alert::PROTOCOL_VERSION,
"Server_Hello: Unsupported server version");
}
s_random = reader.get_fixed<byte>(32);
m_session_id = reader.get_range<byte>(1, 0, 32);
suite = reader.get_u16bit();
comp_method = reader.get_byte();
Extensions extensions(reader);
if(Renegotation_Extension* reneg = extensions.get<Renegotation_Extension>())
{
// checked by Client / Server as they know the handshake state
m_secure_renegotiation = true;
m_renegotiation_info = reneg->renegotiation_info();
}
if(Next_Protocol_Notification* npn = extensions.get<Next_Protocol_Notification>())
{
m_next_protocols = npn->protocols();
m_next_protocol = true;
}
}
/*
* Serialize a Server Hello message
*/
MemoryVector<byte> Server_Hello::serialize() const
{
MemoryVector<byte> buf;
buf.push_back(s_version.major_version());
buf.push_back(s_version.minor_version());
buf += s_random;
append_tls_length_value(buf, m_session_id, 1);
buf.push_back(get_byte(0, suite));
buf.push_back(get_byte(1, suite));
buf.push_back(comp_method);
Extensions extensions;
if(m_secure_renegotiation)
extensions.add(new Renegotation_Extension(m_renegotiation_info));
if(m_fragment_size != 0)
extensions.add(new Maximum_Fragment_Length(m_fragment_size));
if(m_next_protocol)
extensions.add(new Next_Protocol_Notification(m_next_protocols));
buf += extensions.serialize();
return buf;
}
/*
* Create a new Server Hello Done message
*/
Server_Hello_Done::Server_Hello_Done(Record_Writer& writer,
Handshake_Hash& hash)
{
hash.update(writer.send(*this));
}
/*
* Deserialize a Server Hello Done message
*/
Server_Hello_Done::Server_Hello_Done(const MemoryRegion<byte>& buf)
{
if(buf.size())
throw Decoding_Error("Server_Hello_Done: Must be empty, and is not");
}
/*
* Serialize a Server Hello Done message
*/
MemoryVector<byte> Server_Hello_Done::serialize() const
{
return MemoryVector<byte>();
}
}
}
|
