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
|
//
// client.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include <config.h>
#include <iostream>
#ifdef HAVE_GENERIC_TLS_METHOD
#include <cstdlib>
#include <cstring>
#include <functional>
#include <asiolink/asio_wrapper.h>
#include <boost/asio/ssl.hpp>
using boost::asio::ip::tcp;
using std::placeholders::_1;
using std::placeholders::_2;
inline std::string CA_(const std::string& filename) {
return (std::string(TEST_CA_DIR) + "/" + filename);
}
enum { max_length = 1024 };
class client
{
public:
client(boost::asio::io_service& io_context,
boost::asio::ssl::context& context,
const tcp::endpoint& endpoint)
: socket_(io_context, context)
{
socket_.set_verify_mode(boost::asio::ssl::verify_peer |
boost::asio::ssl::verify_fail_if_no_peer_cert);
socket_.set_verify_callback(
std::bind(&client::verify_certificate, this, _1, _2));
connect(endpoint);
}
private:
bool verify_certificate(bool preverified,
boost::asio::ssl::verify_context& ctx)
{
// The verify callback can be used to check whether the certificate that is
// being presented is valid for the peer. For example, RFC 2818 describes
// the steps involved in doing this for HTTPS. Consult the OpenSSL
// documentation for more details. Note that the callback is called once
// for each certificate in the certificate chain, starting from the root
// certificate authority.
// In this example we will simply print the certificate's subject name.
char subject_name[256];
X509* cert = X509_STORE_CTX_get_current_cert(ctx.native_handle());
X509_NAME_oneline(X509_get_subject_name(cert), subject_name, 256);
std::cout << "Verifying " << subject_name << "\n";
return preverified;
}
void connect(const tcp::endpoint& endpoint)
{
socket_.lowest_layer().async_connect(endpoint,
[this](const boost::system::error_code& error)
{
if (!error)
{
handshake();
}
else
{
std::cout << "Connect failed: " << error.message() << "\n";
}
});
}
void handshake()
{
socket_.async_handshake(boost::asio::ssl::stream_base::client,
[this](const boost::system::error_code& error)
{
if (!error)
{
send_request();
}
else
{
std::cout << "Handshake failed: " << error.message() << "\n";
}
});
}
void send_request()
{
std::cout << "Enter message: ";
std::cin.getline(request_, max_length);
size_t request_length = std::strlen(request_);
boost::asio::async_write(socket_,
boost::asio::buffer(request_, request_length),
[this](const boost::system::error_code& error, std::size_t length)
{
if (!error)
{
receive_response(length);
}
else
{
std::cout << "Write failed: " << error.message() << "\n";
}
});
}
void receive_response(std::size_t length)
{
boost::asio::async_read(socket_,
boost::asio::buffer(reply_, length),
[this](const boost::system::error_code& error, std::size_t length)
{
if (!error)
{
std::cout << "Reply: ";
std::cout.write(reply_, length);
std::cout << "\n";
}
else
{
std::cout << "Read failed: " << error.message() << "\n";
}
});
}
boost::asio::ssl::stream<tcp::socket> socket_;
char request_[max_length];
char reply_[max_length];
};
int main(int argc, char* argv[])
{
try
{
if (argc != 3)
{
std::cerr << "Usage: client <addr> <port>\n";
return 1;
}
boost::asio::io_service io_context;
using namespace std; // For atoi.
tcp::endpoint endpoint(
boost::asio::ip::address::from_string(argv[1]), atoi(argv[2]));
boost::asio::ssl::context ctx(boost::asio::ssl::context::method::tls);
ctx.load_verify_file(CA_("kea-ca.crt"));
ctx.use_certificate_chain_file(CA_("kea-client.crt"));
ctx.use_private_key_file(CA_("kea-client.key"),
boost::asio::ssl::context::pem);
client c(io_context, ctx, endpoint);
io_context.run();
}
catch (std::exception& e)
{
std::cerr << "Exception: " << e.what() << "\n";
}
return 0;
}
#else // !HAVE_GENERIC_TLS_METHOD
int main()
{
std::cerr << "this tool requires recent boost version (>= 1.64)\n";
return 0;
}
#endif
|
