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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
/*
* Certificate Request Message
* (C) 2004-2006,2012 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_extensions.h>
#include <botan/internal/tls_handshake_writer.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/loadstor.h>
namespace Botan {
namespace TLS {
namespace {
std::string cert_type_code_to_name(byte code)
{
switch(code)
{
case 1:
return "RSA";
case 2:
return "DSA";
case 64:
return "ECDSA";
default:
return ""; // DH or something else
}
}
byte cert_type_name_to_code(const std::string& name)
{
if(name == "RSA")
return 1;
if(name == "DSA")
return 2;
if(name == "ECDSA")
return 64;
throw Invalid_Argument("Unknown cert type " + name);
}
}
/**
* Create a new Certificate Request message
*/
Certificate_Req::Certificate_Req(Handshake_Writer& writer,
Handshake_Hash& hash,
const Policy& policy,
const std::vector<X509_Certificate>& ca_certs,
Protocol_Version version)
{
for(size_t i = 0; i != ca_certs.size(); ++i)
names.push_back(ca_certs[i].subject_dn());
cert_key_types.push_back("RSA");
cert_key_types.push_back("DSA");
cert_key_types.push_back("ECDSA");
if(version.supports_negotiable_signature_algorithms())
{
std::vector<std::string> hashes = policy.allowed_signature_hashes();
std::vector<std::string> sigs = policy.allowed_signature_methods();
for(size_t i = 0; i != hashes.size(); ++i)
for(size_t j = 0; j != sigs.size(); ++j)
m_supported_algos.push_back(std::make_pair(hashes[i], sigs[j]));
}
hash.update(writer.send(*this));
}
/**
* Deserialize a Certificate Request message
*/
Certificate_Req::Certificate_Req(const std::vector<byte>& buf,
Protocol_Version version)
{
if(buf.size() < 4)
throw Decoding_Error("Certificate_Req: Bad certificate request");
TLS_Data_Reader reader(buf);
std::vector<byte> cert_type_codes = reader.get_range_vector<byte>(1, 1, 255);
for(size_t i = 0; i != cert_type_codes.size(); ++i)
{
const std::string cert_type_name = cert_type_code_to_name(cert_type_codes[i]);
if(cert_type_name == "") // something we don't know
continue;
cert_key_types.push_back(cert_type_name);
}
if(version.supports_negotiable_signature_algorithms())
{
std::vector<byte> sig_hash_algs = reader.get_range_vector<byte>(2, 2, 65534);
if(sig_hash_algs.size() % 2 != 0)
throw Decoding_Error("Bad length for signature IDs in certificate request");
for(size_t i = 0; i != sig_hash_algs.size(); i += 2)
{
std::string hash = Signature_Algorithms::hash_algo_name(sig_hash_algs[i]);
std::string sig = Signature_Algorithms::sig_algo_name(sig_hash_algs[i+1]);
m_supported_algos.push_back(std::make_pair(hash, sig));
}
}
const u16bit purported_size = reader.get_u16bit();
if(reader.remaining_bytes() != purported_size)
throw Decoding_Error("Inconsistent length in certificate request");
while(reader.has_remaining())
{
std::vector<byte> name_bits = reader.get_range_vector<byte>(2, 0, 65535);
BER_Decoder decoder(&name_bits[0], name_bits.size());
X509_DN name;
decoder.decode(name);
names.push_back(name);
}
}
/**
* Serialize a Certificate Request message
*/
std::vector<byte> Certificate_Req::serialize() const
{
std::vector<byte> buf;
std::vector<byte> cert_types;
for(size_t i = 0; i != cert_key_types.size(); ++i)
cert_types.push_back(cert_type_name_to_code(cert_key_types[i]));
append_tls_length_value(buf, cert_types, 1);
if(!m_supported_algos.empty())
buf += Signature_Algorithms(m_supported_algos).serialize();
std::vector<byte> encoded_names;
for(size_t i = 0; i != names.size(); ++i)
{
DER_Encoder encoder;
encoder.encode(names[i]);
append_tls_length_value(encoded_names, encoder.get_contents(), 2);
}
append_tls_length_value(buf, encoded_names, 2);
return buf;
}
/**
* Create a new Certificate message
*/
Certificate::Certificate(Handshake_Writer& writer,
Handshake_Hash& hash,
const std::vector<X509_Certificate>& cert_list) :
m_certs(cert_list)
{
hash.update(writer.send(*this));
}
/**
* Deserialize a Certificate message
*/
Certificate::Certificate(const std::vector<byte>& buf)
{
if(buf.size() < 3)
throw Decoding_Error("Certificate: Message malformed");
const size_t total_size = make_u32bit(0, buf[0], buf[1], buf[2]);
if(total_size != buf.size() - 3)
throw Decoding_Error("Certificate: Message malformed");
const byte* certs = &buf[3];
while(size_t remaining_bytes = &buf[buf.size()] - certs)
{
if(remaining_bytes < 3)
throw Decoding_Error("Certificate: Message malformed");
const size_t cert_size = make_u32bit(0, certs[0], certs[1], certs[2]);
if(remaining_bytes < (3 + cert_size))
throw Decoding_Error("Certificate: Message malformed");
DataSource_Memory cert_buf(&certs[3], cert_size);
m_certs.push_back(X509_Certificate(cert_buf));
certs += cert_size + 3;
}
}
/**
* Serialize a Certificate message
*/
std::vector<byte> Certificate::serialize() const
{
std::vector<byte> buf(3);
for(size_t i = 0; i != m_certs.size(); ++i)
{
std::vector<byte> raw_cert = m_certs[i].BER_encode();
const size_t cert_size = raw_cert.size();
for(size_t i = 0; i != 3; ++i)
buf.push_back(get_byte<u32bit>(i+1, cert_size));
buf += raw_cert;
}
const size_t buf_size = buf.size() - 3;
for(size_t i = 0; i != 3; ++i)
buf[i] = get_byte<u32bit>(i+1, buf_size);
return buf;
}
}
}
|
