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
|
/*
* Certificate Request Message
* (C) 2004-2006,2012 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/tls_messages.h>
#include <botan/tls_extensions.h>
#include <botan/internal/tls_reader.h>
#include <botan/internal/tls_handshake_io.h>
#include <botan/internal/tls_handshake_hash.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(uint8_t code)
{
switch(code)
{
case 1:
return "RSA";
case 2:
return "DSA";
case 64:
return "ECDSA";
default:
return ""; // DH or something else
}
}
uint8_t 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_IO& io,
Handshake_Hash& hash,
const Policy& policy,
const std::vector<X509_DN>& ca_certs,
Protocol_Version version) :
m_names(ca_certs),
m_cert_key_types({ "RSA", "DSA", "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(io.send(*this));
}
/**
* Deserialize a Certificate Request message
*/
Certificate_Req::Certificate_Req(const std::vector<uint8_t>& buf,
Protocol_Version version)
{
if(buf.size() < 4)
throw Decoding_Error("Certificate_Req: Bad certificate request");
TLS_Data_Reader reader("CertificateRequest", buf);
std::vector<uint8_t> cert_type_codes = reader.get_range_vector<uint8_t>(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.empty()) // something we don't know
continue;
m_cert_key_types.push_back(cert_type_name);
}
if(version.supports_negotiable_signature_algorithms())
{
std::vector<uint8_t> sig_hash_algs = reader.get_range_vector<uint8_t>(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 uint16_t purported_size = reader.get_uint16_t();
if(reader.remaining_bytes() != purported_size)
throw Decoding_Error("Inconsistent length in certificate request");
while(reader.has_remaining())
{
std::vector<uint8_t> name_bits = reader.get_range_vector<uint8_t>(2, 0, 65535);
BER_Decoder decoder(name_bits.data(), name_bits.size());
X509_DN name;
decoder.decode(name);
m_names.push_back(name);
}
}
/**
* Serialize a Certificate Request message
*/
std::vector<uint8_t> Certificate_Req::serialize() const
{
std::vector<uint8_t> buf;
std::vector<uint8_t> cert_types;
for(size_t i = 0; i != m_cert_key_types.size(); ++i)
cert_types.push_back(cert_type_name_to_code(m_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<uint8_t> encoded_names;
for(size_t i = 0; i != m_names.size(); ++i)
{
DER_Encoder encoder;
encoder.encode(m_names[i]);
append_tls_length_value(encoded_names, encoder.get_contents(), 2);
}
append_tls_length_value(buf, encoded_names, 2);
return buf;
}
}
}
|
