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
|
/*
* TLS Server Hello and Server Hello Done
* (C) 2004-2011,2015,2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#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/internal/tls_handshake_io.h>
#include <botan/internal/stl_util.h>
namespace Botan {
namespace TLS {
// New session case
Server_Hello::Server_Hello(Handshake_IO& io,
Handshake_Hash& hash,
const Policy& policy,
RandomNumberGenerator& rng,
const std::vector<byte>& reneg_info,
const Client_Hello& client_hello,
const std::vector<byte>& new_session_id,
Protocol_Version new_session_version,
u16bit ciphersuite,
byte compression,
bool offer_session_ticket,
const std::string& next_protocol) :
m_version(new_session_version),
m_session_id(new_session_id),
m_random(make_hello_random(rng, policy)),
m_ciphersuite(ciphersuite),
m_comp_method(compression)
{
if(client_hello.supports_extended_master_secret())
m_extensions.add(new Extended_Master_Secret);
if(client_hello.supports_encrypt_then_mac() && policy.negotiate_encrypt_then_mac())
{
Ciphersuite c = Ciphersuite::by_id(m_ciphersuite);
if(c.cbc_ciphersuite())
m_extensions.add(new Encrypt_then_MAC);
}
if(client_hello.secure_renegotiation())
m_extensions.add(new Renegotiation_Extension(reneg_info));
if(client_hello.supports_session_ticket() && offer_session_ticket)
m_extensions.add(new Session_Ticket());
if(!next_protocol.empty() && client_hello.supports_alpn())
m_extensions.add(new Application_Layer_Protocol_Notification(next_protocol));
if(m_version.is_datagram_protocol())
{
const std::vector<u16bit> server_srtp = policy.srtp_profiles();
const std::vector<u16bit> client_srtp = client_hello.srtp_profiles();
if(!server_srtp.empty() && !client_srtp.empty())
{
u16bit shared = 0;
// always using server preferences for now
for(auto s : server_srtp)
for(auto c : client_srtp)
{
if(shared == 0 && s == c)
shared = s;
}
if(shared)
m_extensions.add(new SRTP_Protection_Profiles(shared));
}
}
hash.update(io.send(*this));
}
// Resuming
Server_Hello::Server_Hello(Handshake_IO& io,
Handshake_Hash& hash,
const Policy& policy,
RandomNumberGenerator& rng,
const std::vector<byte>& reneg_info,
const Client_Hello& client_hello,
Session& resumed_session,
bool offer_session_ticket,
const std::string& next_protocol) :
m_version(resumed_session.version()),
m_session_id(client_hello.session_id()),
m_random(make_hello_random(rng, policy)),
m_ciphersuite(resumed_session.ciphersuite_code()),
m_comp_method(resumed_session.compression_method())
{
if(client_hello.supports_extended_master_secret())
m_extensions.add(new Extended_Master_Secret);
if(client_hello.supports_encrypt_then_mac() && policy.negotiate_encrypt_then_mac())
{
Ciphersuite c = resumed_session.ciphersuite();
if(c.cbc_ciphersuite())
m_extensions.add(new Encrypt_then_MAC);
}
if(client_hello.secure_renegotiation())
m_extensions.add(new Renegotiation_Extension(reneg_info));
if(client_hello.supports_session_ticket() && offer_session_ticket)
m_extensions.add(new Session_Ticket());
if(!next_protocol.empty() && client_hello.supports_alpn())
m_extensions.add(new Application_Layer_Protocol_Notification(next_protocol));
hash.update(io.send(*this));
}
/*
* Deserialize a Server Hello message
*/
Server_Hello::Server_Hello(const std::vector<byte>& buf)
{
if(buf.size() < 38)
throw Decoding_Error("Server_Hello: Packet corrupted");
TLS_Data_Reader reader("ServerHello", buf);
const byte major_version = reader.get_byte();
const byte minor_version = reader.get_byte();
m_version = Protocol_Version(major_version, minor_version);
m_random = reader.get_fixed<byte>(32);
m_session_id = reader.get_range<byte>(1, 0, 32);
m_ciphersuite = reader.get_u16bit();
m_comp_method = reader.get_byte();
m_extensions.deserialize(reader);
}
/*
* Serialize a Server Hello message
*/
std::vector<byte> Server_Hello::serialize() const
{
std::vector<byte> buf;
buf.push_back(m_version.major_version());
buf.push_back(m_version.minor_version());
buf += m_random;
append_tls_length_value(buf, m_session_id, 1);
buf.push_back(get_byte(0, m_ciphersuite));
buf.push_back(get_byte(1, m_ciphersuite));
buf.push_back(m_comp_method);
buf += m_extensions.serialize();
return buf;
}
/*
* Create a new Server Hello Done message
*/
Server_Hello_Done::Server_Hello_Done(Handshake_IO& io,
Handshake_Hash& hash)
{
hash.update(io.send(*this));
}
/*
* Deserialize a Server Hello Done message
*/
Server_Hello_Done::Server_Hello_Done(const std::vector<byte>& buf)
{
if(buf.size())
throw Decoding_Error("Server_Hello_Done: Must be empty, and is not");
}
/*
* Serialize a Server Hello Done message
*/
std::vector<byte> Server_Hello_Done::serialize() const
{
return std::vector<byte>();
}
}
}
|
