16055899095

Committed 03 Jul 2025 04:34PM UTC coverage: 90.571% (-0.003%) from 90.574%

Build # 16055899095

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github

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web-flow

Commit Message

Merge pull request #4931 from randombit/jack/moar-tidy

Address various warnings from clang-tidy

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83.41

/src/cli/tls_proxy.cpp

/*
* TLS Server Proxy
* (C) 2014,2015,2019 Jack Lloyd
* (C) 2016 Matthias Gierlings
* (C) 2023 René Meusel, Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include "cli.h"

#if defined(BOTAN_HAS_TLS) && defined(BOTAN_HAS_BOOST_ASIO) && defined(BOTAN_TARGET_OS_HAS_FILESYSTEM)

   #include <atomic>
   #include <iostream>
   #include <string>
   #include <thread>
   #include <utility>
   #include <vector>

   #include <boost/asio.hpp>
   #include <boost/bind.hpp>

   #include <botan/hex.h>
   #include <botan/pkcs8.h>
   #include <botan/rng.h>
   #include <botan/tls_server.h>
   #include <botan/tls_session_manager_memory.h>
   #include <botan/x509cert.h>

   #if defined(BOTAN_HAS_TLS_SQLITE3_SESSION_MANAGER)
      #include <botan/tls_session_manager_sqlite.h>
   #endif

   #if defined(BOTAN_HAS_OS_UTILS)
      #include <botan/internal/os_utils.h>
   #endif

   #include "tls_helpers.h"

namespace Botan_CLI {

namespace {

// NOLINTBEGIN(*-avoid-endl,*-avoid-bind)

using boost::asio::ip::tcp;

template <typename T>
boost::asio::io_context& get_io_service(T& s) {
   #if BOOST_VERSION >= 107000
   //NOLINTNEXTLINE(*-type-static-cast-downcast)
   return static_cast<boost::asio::io_context&>((s).get_executor().context());
   #else
   return s.get_io_service();
   #endif
}

void log_info(const std::string& msg) {
   std::cout << msg << std::endl;
}

void log_exception(const char* where, const std::exception& e) {
   std::cout << where << ' ' << e.what() << std::endl;
}

void log_error(const char* where, const boost::system::error_code& error) {
   std::cout << where << ' ' << error.message() << std::endl;
}

void log_error(const char* msg) {
   std::cout << msg << std::endl;
}

void log_binary_message(const char* where, const uint8_t buf[], size_t buf_len) {
   BOTAN_UNUSED(where, buf, buf_len);
   //std::cout << where << ' ' << Botan::hex_encode(buf, buf_len) << std::endl;
}

void log_text_message(const char* where, const uint8_t buf[], size_t buf_len) {
   BOTAN_UNUSED(where, buf, buf_len);
   //const char* c = reinterpret_cast<const char*>(buf);
   //std::cout << where << ' ' << std::string(c, c + buf_len)  << std::endl;
}

class ServerStatus {
   public:
      explicit ServerStatus(size_t max_clients) : m_max_clients(max_clients), m_clients_serviced(0) {}

      bool should_exit() const {
         if(m_max_clients == 0) {
            return false;
         }

         return clients_serviced() >= m_max_clients;
      }

      void client_serviced() { m_clients_serviced++; }

      size_t clients_serviced() const { return m_clients_serviced.load(); }

   private:
      size_t m_max_clients;
      std::atomic<size_t> m_clients_serviced;
};

class tls_proxy_session final : public std::enable_shared_from_this<tls_proxy_session>,
                                public Botan::TLS::Callbacks {
   public:
      static constexpr size_t readbuf_size = 17 * 1024;

      typedef std::shared_ptr<tls_proxy_session> pointer;

      static pointer create(boost::asio::io_context& io,
                            const std::shared_ptr<Botan::TLS::Session_Manager>& session_manager,
                            const std::shared_ptr<Botan::Credentials_Manager>& credentials,
                            const std::shared_ptr<Botan::TLS::Policy>& policy,
                            const tcp::resolver::results_type& endpoints) {
         auto session = std::make_shared<tls_proxy_session>(io, endpoints);

         // Defer the setup of the TLS server to make use of
         // shared_from_this() which wouldn't work in the c'tor.
         session->setup(session_manager, credentials, policy);

         return session;
      }

      tcp::socket& client_socket() { return m_client_socket; }

      void start() {
         m_c2p.resize(readbuf_size);
         client_read(boost::system::error_code(), 0);  // start read loop
      }

      void stop() {
         if(m_is_closed == false) {
            /*
            Don't need to talk to the server anymore
            Client socket is closed during write callback
            */
            m_server_socket.close();
            m_tls->close();

            // Need to explicitly destroy the TLS::Server object to break the
            // circular ownership of shared_from_this() and the shared_ptr of
            // this kept inside the TLS::Channel.
            m_tls.reset();
            m_is_closed = true;
         }
      }

      tls_proxy_session(boost::asio::io_context& io, tcp::resolver::results_type endpoints) :
            m_strand(io),
            m_server_endpoints(std::move(endpoints)),
            m_client_socket(io),
            m_server_socket(io),
            m_rng(cli_make_rng()) {}

   private:
      void setup(const std::shared_ptr<Botan::TLS::Session_Manager>& session_manager,
                 const std::shared_ptr<Botan::Credentials_Manager>& credentials,
                 const std::shared_ptr<Botan::TLS::Policy>& policy) {
         m_tls = std::make_unique<Botan::TLS::Server>(shared_from_this(), session_manager, credentials, policy, m_rng);
      }

      void client_read(const boost::system::error_code& error, size_t bytes_transferred) {
         if(error) {
            log_error("Read failed", error);
            stop();
            return;
         }

         if(m_is_closed) {
            log_error("Received client data after close");
            return;
         }

         try {
            if(!m_tls->is_active()) {
               log_binary_message("From client", &m_c2p[0], bytes_transferred);
            }
            m_tls->received_data(&m_c2p[0], bytes_transferred);
         } catch(Botan::Exception& e) {
            log_exception("TLS connection failed", e);
            stop();
            return;
         }

         m_client_socket.async_read_some(boost::asio::buffer(&m_c2p[0], m_c2p.size()),
                                         m_strand.wrap(boost::bind(&tls_proxy_session::client_read,
                                                                   shared_from_this(),
                                                                   boost::asio::placeholders::error,
                                                                   boost::asio::placeholders::bytes_transferred)));
      }

      void handle_client_write_completion(const boost::system::error_code& error) {
         if(error) {
            log_error("Client write", error);
            stop();
            return;
         }

         m_p2c.clear();

         if(m_p2c_pending.empty() && (!m_tls || m_tls->is_closed())) {
            m_client_socket.close();
         }
         tls_emit_data({});  // initiate another write if needed
      }

      void handle_server_write_completion(const boost::system::error_code& error) {
         if(error) {
            log_error("Server write", error);
            stop();
            return;
         }

         m_p2s.clear();
         proxy_write_to_server({});  // initiate another write if needed
      }

      void tls_record_received(uint64_t /*rec_no*/, std::span<const uint8_t> buf) override {
         // Immediately bounce message to server
         proxy_write_to_server(buf);
      }

      void tls_emit_data(std::span<const uint8_t> buf) override {
         if(!buf.empty()) {
            m_p2c_pending.insert(m_p2c_pending.end(), buf.begin(), buf.end());
         }

         // no write now active and we still have output pending
         if(m_p2c.empty() && !m_p2c_pending.empty()) {
            std::swap(m_p2c_pending, m_p2c);

            log_binary_message("To Client", &m_p2c[0], m_p2c.size());

            boost::asio::async_write(m_client_socket,
                                     boost::asio::buffer(&m_p2c[0], m_p2c.size()),
                                     m_strand.wrap(boost::bind(&tls_proxy_session::handle_client_write_completion,
                                                               shared_from_this(),
                                                               boost::asio::placeholders::error)));
         }
      }

      void proxy_write_to_server(std::span<const uint8_t> buf) {
         if(!buf.empty()) {
            m_p2s_pending.insert(m_p2s_pending.end(), buf.begin(), buf.end());
         }

         // no write now active and we still have output pending
         if(m_p2s.empty() && !m_p2s_pending.empty()) {
            std::swap(m_p2s_pending, m_p2s);

            log_text_message("To Server", &m_p2s[0], m_p2s.size());

            boost::asio::async_write(m_server_socket,
                                     boost::asio::buffer(&m_p2s[0], m_p2s.size()),
                                     m_strand.wrap(boost::bind(&tls_proxy_session::handle_server_write_completion,
                                                               shared_from_this(),
                                                               boost::asio::placeholders::error)));
         }
      }

      void server_read(const boost::system::error_code& error, size_t bytes_transferred) {
         if(error) {
            log_error("Server read failed", error);
            stop();
            return;
         }

         try {
            if(bytes_transferred) {
               log_text_message("Server to client", &m_s2p[0], m_s2p.size());
               log_binary_message("Server to client", &m_s2p[0], m_s2p.size());
               m_tls->send(&m_s2p[0], bytes_transferred);
            }
         } catch(Botan::Exception& e) {
            log_exception("TLS connection failed", e);
            stop();
            return;
         }

         m_s2p.resize(readbuf_size);

         m_server_socket.async_read_some(boost::asio::buffer(&m_s2p[0], m_s2p.size()),
                                         m_strand.wrap(boost::bind(&tls_proxy_session::server_read,
                                                                   shared_from_this(),
                                                                   boost::asio::placeholders::error,
                                                                   boost::asio::placeholders::bytes_transferred)));
      }

      void tls_session_activated() override {
         auto onConnect = [self = weak_from_this()](boost::system::error_code ec,
                                                    const tcp::resolver::results_type::iterator& /*endpoint*/) {
            if(ec) {
               log_error("Server connection", ec);
               return;
            }

            if(auto ptr = self.lock()) {
               ptr->server_read(boost::system::error_code(), 0);  // start read loop
               ptr->proxy_write_to_server({});
            } else {
               log_error("Server connection established, but client session already closed");
               return;
            }
         };
         async_connect(m_server_socket, m_server_endpoints.begin(), m_server_endpoints.end(), onConnect);
      }

      void tls_session_established(const Botan::TLS::Session_Summary& session) override {
         m_hostname = session.server_info().hostname();
      }

      void tls_alert(Botan::TLS::Alert alert) override {
         if(alert.type() == Botan::TLS::Alert::CloseNotify) {
            m_tls->close();
            return;
         }
      }

      boost::asio::io_context::strand m_strand;

      tcp::resolver::results_type m_server_endpoints;

      tcp::socket m_client_socket;
      tcp::socket m_server_socket;

      std::shared_ptr<Botan::RandomNumberGenerator> m_rng;
      std::unique_ptr<Botan::TLS::Server> m_tls;
      std::string m_hostname;

      std::vector<uint8_t> m_c2p;
      std::vector<uint8_t> m_p2c;
      std::vector<uint8_t> m_p2c_pending;

      std::vector<uint8_t> m_s2p;
      std::vector<uint8_t> m_p2s;
      std::vector<uint8_t> m_p2s_pending;

      bool m_is_closed = false;
};

class tls_proxy_server final {
   public:
      typedef tls_proxy_session session;

      tls_proxy_server(boost::asio::io_context& io,
                       unsigned short port,
                       tcp::resolver::results_type endpoints,
                       std::shared_ptr<Botan::Credentials_Manager> creds,
                       std::shared_ptr<Botan::TLS::Policy> policy,
                       std::shared_ptr<Botan::TLS::Session_Manager> session_mgr,
                       size_t max_clients) :
            m_acceptor(io, tcp::endpoint(tcp::v4(), port)),
            m_server_endpoints(std::move(endpoints)),
            m_creds(std::move(creds)),
            m_policy(std::move(policy)),
            m_session_manager(std::move(session_mgr)),
            m_status(max_clients) {
         log_info("Listening for new connections on port " + std::to_string(port));
         serve_one_session();
      }

   private:
      session::pointer make_session() {
         return session::create(get_io_service(m_acceptor), m_session_manager, m_creds, m_policy, m_server_endpoints);
      }

      void serve_one_session() {
         session::pointer new_session = make_session();

         m_acceptor.async_accept(
            new_session->client_socket(),
            boost::bind(&tls_proxy_server::handle_accept, this, new_session, boost::asio::placeholders::error));
      }

      void handle_accept(const session::pointer& new_session, const boost::system::error_code& error) {
         if(!error) {
            new_session->start();
            m_status.client_serviced();

            if(!m_status.should_exit()) {
               serve_one_session();
            }
         }
      }

      tcp::acceptor m_acceptor;
      tcp::resolver::results_type m_server_endpoints;

      std::shared_ptr<Botan::Credentials_Manager> m_creds;
      std::shared_ptr<Botan::TLS::Policy> m_policy;
      std::shared_ptr<Botan::TLS::Session_Manager> m_session_manager;
      ServerStatus m_status;
};

}  // namespace

class TLS_Proxy final : public Command {
   public:
      TLS_Proxy() :
            Command(
               "tls_proxy listen_port target_host target_port server_cert server_key "
               "--policy=default --threads=0 --max-clients=0 --session-db= --session-db-pass=") {}

      std::string group() const override { return "tls"; }

      std::string description() const override { return "Proxies requests between a TLS client and a TLS server"; }

      size_t thread_count() const {
         if(size_t t = get_arg_sz("threads")) {
            return t;
         }
   #if defined(BOTAN_HAS_OS_UTILS)
         if(size_t t = Botan::OS::get_cpu_available()) {
            return t;
         }
   #endif
         return 2;
      }

      void go() override {
         const uint16_t listen_port = get_arg_u16("listen_port");
         const std::string target = get_arg("target_host");
         const std::string target_port = get_arg("target_port");

         const std::string server_crt = get_arg("server_cert");
         const std::string server_key = get_arg("server_key");

         const size_t num_threads = thread_count();
         const size_t max_clients = get_arg_sz("max-clients");

         auto creds = std::make_shared<Basic_Credentials_Manager>(server_crt, server_key);

         auto policy = load_tls_policy(get_arg("policy"));

         boost::asio::io_context io;

         tcp::resolver resolver(io);
         auto server_endpoint_iterator = resolver.resolve(target, target_port);

         std::shared_ptr<Botan::TLS::Session_Manager> session_mgr;

   #if defined(BOTAN_HAS_TLS_SQLITE3_SESSION_MANAGER)
         const std::string sessions_passphrase = get_passphrase_arg("Session DB passphrase", "session-db-pass");
         const std::string sessions_db = get_arg("session-db");

         if(!sessions_db.empty()) {
            session_mgr =
               std::make_shared<Botan::TLS::Session_Manager_SQLite>(sessions_passphrase, rng_as_shared(), sessions_db);
         }
   #endif
         if(!session_mgr) {
            session_mgr = std::make_shared<Botan::TLS::Session_Manager_In_Memory>(rng_as_shared());
         }

         tls_proxy_server server(io, listen_port, server_endpoint_iterator, creds, policy, session_mgr, max_clients);

         std::vector<std::shared_ptr<std::thread>> threads;

         // run forever... first thread is main calling io.run below
         for(size_t i = 2; i <= num_threads; ++i) {
            threads.push_back(std::make_shared<std::thread>([&io]() { io.run(); }));
         }

         io.run();

         for(size_t i = 0; i < threads.size(); ++i) {
            threads[i]->join();
         }
      }
};

// NOLINTEND(*-avoid-endl,*-avoid-bind)

BOTAN_REGISTER_COMMAND("tls_proxy", TLS_Proxy);

}  // namespace Botan_CLI

#endif

1	/*
2	* TLS Server Proxy
3	* (C) 2014,2015,2019 Jack Lloyd
4	* (C) 2016 Matthias Gierlings
5	* (C) 2023 René Meusel, Rohde & Schwarz Cybersecurity
6	*
7	* Botan is released under the Simplified BSD License (see license.txt)
8	*/
9
10	#include "cli.h"
11
12	#if defined(BOTAN_HAS_TLS) && defined(BOTAN_HAS_BOOST_ASIO) && defined(BOTAN_TARGET_OS_HAS_FILESYSTEM)
13
14	#include <atomic>
15	#include <iostream>
16	#include <string>
17	#include <thread>
18	#include <utility>
19	#include <vector>
20
21	#include <boost/asio.hpp>
22	#include <boost/bind.hpp>
23
24	#include <botan/hex.h>
25	#include <botan/pkcs8.h>
26	#include <botan/rng.h>
27	#include <botan/tls_server.h>
28	#include <botan/tls_session_manager_memory.h>
29	#include <botan/x509cert.h>
30
31	#if defined(BOTAN_HAS_TLS_SQLITE3_SESSION_MANAGER)
32	#include <botan/tls_session_manager_sqlite.h>
33	#endif
34
35	#if defined(BOTAN_HAS_OS_UTILS)
36	#include <botan/internal/os_utils.h>
37	#endif
38
39	#include "tls_helpers.h"
40
41	namespace Botan_CLI {
42
43	namespace {
44
45	// NOLINTBEGIN(-avoid-endl,-avoid-bind)
46
47	using boost::asio::ip::tcp;
48
49	template <typename T>
50	boost::asio::io_context& get_io_service(T& s) {	4✔
51	#if BOOST_VERSION >= 107000
52	//NOLINTNEXTLINE(*-type-static-cast-downcast)
53	return static_cast<boost::asio::io_context&>((s).get_executor().context());	4✔
54	#else
55	return s.get_io_service();
56	#endif
57	}
58
59	void log_info(const std::string& msg) {	1✔
60	std::cout << msg << std::endl;	1✔
61	}	1✔
62
63	void log_exception(const char* where, const std::exception& e) {	×
64	std::cout << where << ' ' << e.what() << std::endl;	×
65	}	×
66
67	void log_error(const char* where, const boost::system::error_code& error) {	8✔
68	std::cout << where << ' ' << error.message() << std::endl;	16✔
69	}	8✔
70
71	void log_error(const char* msg) {	×
72	std::cout << msg << std::endl;	×
73	}	×
74
75	void log_binary_message(const char* where, const uint8_t buf[], size_t buf_len) {
76	BOTAN_UNUSED(where, buf, buf_len);	27✔
77	//std::cout << where << ' ' << Botan::hex_encode(buf, buf_len) << std::endl;
78	}
79
80	void log_text_message(const char* where, const uint8_t buf[], size_t buf_len) {
81	BOTAN_UNUSED(where, buf, buf_len);	9✔
82	//const char* c = reinterpret_cast<const char*>(buf);
83	//std::cout << where << ' ' << std::string(c, c + buf_len) << std::endl;
84	}
85
86	class ServerStatus {
87	public:
88	explicit ServerStatus(size_t max_clients) : m_max_clients(max_clients), m_clients_serviced(0) {}	1✔
89
90	bool should_exit() const {	4✔
91	if(m_max_clients == 0) {	4✔
92	return false;
93	}
94
95	return clients_serviced() >= m_max_clients;	4✔
96	}
97
98	void client_serviced() { m_clients_serviced++; }	4✔
99
100	size_t clients_serviced() const { return m_clients_serviced.load(); }	4✔
101
102	private:
103	size_t m_max_clients;
104	std::atomic<size_t> m_clients_serviced;
105	};
106
107	class tls_proxy_session final : public std::enable_shared_from_this<tls_proxy_session>,
108	public Botan::TLS::Callbacks {
109	public:
110	static constexpr size_t readbuf_size = 17 * 1024;
111
112	typedef std::shared_ptr<tls_proxy_session> pointer;
113
114	static pointer create(boost::asio::io_context& io,	4✔
115	const std::shared_ptr<Botan::TLS::Session_Manager>& session_manager,
116	const std::shared_ptr<Botan::Credentials_Manager>& credentials,
117	const std::shared_ptr<Botan::TLS::Policy>& policy,
118	const tcp::resolver::results_type& endpoints) {
119	auto session = std::make_shared<tls_proxy_session>(io, endpoints);	4✔
120
121	// Defer the setup of the TLS server to make use of
122	// shared_from_this() which wouldn't work in the c'tor.
123	session->setup(session_manager, credentials, policy);	4✔
124
125	return session;	4✔
126	}	×
127
128	tcp::socket& client_socket() { return m_client_socket; }
129
130	void start() {	4✔
131	m_c2p.resize(readbuf_size);	4✔
132	client_read(boost::system::error_code(), 0); // start read loop	4✔
133	}	4✔
134
135	void stop() {	8✔
136	if(m_is_closed == false) {	8✔
137	/*
138	Don't need to talk to the server anymore
139	Client socket is closed during write callback
140	*/
141	m_server_socket.close();	4✔
142	m_tls->close();	4✔
143
144	// Need to explicitly destroy the TLS::Server object to break the
145	// circular ownership of shared_from_this() and the shared_ptr of
146	// this kept inside the TLS::Channel.
147	m_tls.reset();	4✔
148	m_is_closed = true;	4✔
149	}
150	}	8✔
151
152	tls_proxy_session(boost::asio::io_context& io, tcp::resolver::results_type endpoints) :	4✔
153	m_strand(io),	4✔
154	m_server_endpoints(std::move(endpoints)),	4✔
155	m_client_socket(io),	4✔
156	m_server_socket(io),	8✔
157	m_rng(cli_make_rng()) {}	12✔
158
159	private:
160	void setup(const std::shared_ptr<Botan::TLS::Session_Manager>& session_manager,	4✔
161	const std::shared_ptr<Botan::Credentials_Manager>& credentials,
162	const std::shared_ptr<Botan::TLS::Policy>& policy) {
163	m_tls = std::make_unique<Botan::TLS::Server>(shared_from_this(), session_manager, credentials, policy, m_rng);	4✔
164	}	4✔
165
166	void client_read(const boost::system::error_code& error, size_t bytes_transferred) {	19✔
167	if(error) {	19✔
168	log_error("Read failed", error);	4✔
169	stop();	4✔
170	return;	4✔
171	}
172
173	if(m_is_closed) {	15✔
174	log_error("Received client data after close");	×
175	return;	×
176	}
177
178	try {	15✔
179	if(!m_tls->is_active()) {	15✔
180	log_binary_message("From client", &m_c2p[0], bytes_transferred);
181	}
182	m_tls->received_data(&m_c2p[0], bytes_transferred);	15✔
183	} catch(Botan::Exception& e) {	×
184	log_exception("TLS connection failed", e);	×
185	stop();	×
186	return;	×
187	}	×
188
189	m_client_socket.async_read_some(boost::asio::buffer(&m_c2p[0], m_c2p.size()),	30✔
190	m_strand.wrap(boost::bind(&tls_proxy_session::client_read,	30✔
191	shared_from_this(),	30✔
192	boost::asio::placeholders::error,
193	boost::asio::placeholders::bytes_transferred)));
194	}
195
196	void handle_client_write_completion(const boost::system::error_code& error) {	22✔
197	if(error) {	22✔
198	log_error("Client write", error);	×
199	stop();	×
200	return;	×
201	}
202
203	m_p2c.clear();	22✔
204
205	if(m_p2c_pending.empty() && (!m_tls \|\| m_tls->is_closed())) {	22✔
206	m_client_socket.close();	4✔
207	}
208	tls_emit_data({}); // initiate another write if needed	22✔
209	}
210
211	void handle_server_write_completion(const boost::system::error_code& error) {	4✔
212	if(error) {	4✔
213	log_error("Server write", error);	×
214	stop();	×
215	return;	×
216	}
217
218	m_p2s.clear();	4✔
219	proxy_write_to_server({}); // initiate another write if needed	4✔
220	}
221
222	void tls_record_received(uint64_t /rec_no/, std::span<const uint8_t> buf) override {	4✔
223	// Immediately bounce message to server
224	proxy_write_to_server(buf);	4✔
225	}	4✔
226
227	void tls_emit_data(std::span<const uint8_t> buf) override {	49✔
228	if(!buf.empty()) {	49✔
229	m_p2c_pending.insert(m_p2c_pending.end(), buf.begin(), buf.end());	27✔
230	}
231
232	// no write now active and we still have output pending
233	if(m_p2c.empty() && !m_p2c_pending.empty()) {	49✔
234	std::swap(m_p2c_pending, m_p2c);	22✔
235
236	log_binary_message("To Client", &m_p2c[0], m_p2c.size());	22✔
237
238	boost::asio::async_write(m_client_socket,	22✔
239	boost::asio::buffer(&m_p2c[0], m_p2c.size()),	22✔
240	m_strand.wrap(boost::bind(&tls_proxy_session::handle_client_write_completion,	44✔
241	shared_from_this(),	44✔
242	boost::asio::placeholders::error)));
243	}
244	}	49✔
245
246	void proxy_write_to_server(std::span<const uint8_t> buf) {	12✔
247	if(!buf.empty()) {	12✔
248	m_p2s_pending.insert(m_p2s_pending.end(), buf.begin(), buf.end());	4✔
249	}
250
251	// no write now active and we still have output pending
252	if(m_p2s.empty() && !m_p2s_pending.empty()) {	12✔
253	std::swap(m_p2s_pending, m_p2s);	4✔
254
255	log_text_message("To Server", &m_p2s[0], m_p2s.size());	4✔
256
257	boost::asio::async_write(m_server_socket,	4✔
258	boost::asio::buffer(&m_p2s[0], m_p2s.size()),	4✔
259	m_strand.wrap(boost::bind(&tls_proxy_session::handle_server_write_completion,	8✔
260	shared_from_this(),	8✔
261	boost::asio::placeholders::error)));
262	}
263	}	12✔
264
265	void server_read(const boost::system::error_code& error, size_t bytes_transferred) {	13✔
266	if(error) {	13✔
267	log_error("Server read failed", error);	4✔
268	stop();	4✔
269	return;	4✔
270	}
271
272	try {	9✔
273	if(bytes_transferred) {	9✔
274	log_text_message("Server to client", &m_s2p[0], m_s2p.size());	5✔
275	log_binary_message("Server to client", &m_s2p[0], m_s2p.size());	5✔
276	m_tls->send(&m_s2p[0], bytes_transferred);	5✔
277	}
278	} catch(Botan::Exception& e) {	×
279	log_exception("TLS connection failed", e);	×
280	stop();	×
281	return;	×
282	}	×
283
284	m_s2p.resize(readbuf_size);	9✔
285
286	m_server_socket.async_read_some(boost::asio::buffer(&m_s2p[0], m_s2p.size()),	18✔
287	m_strand.wrap(boost::bind(&tls_proxy_session::server_read,	18✔
288	shared_from_this(),	18✔
289	boost::asio::placeholders::error,
290	boost::asio::placeholders::bytes_transferred)));
291	}
292
293	void tls_session_activated() override {	4✔
294	auto onConnect = [self = weak_from_this()](boost::system::error_code ec,	12✔
295	const tcp::resolver::results_type::iterator& /endpoint/) {
296	if(ec) {	4✔
297	log_error("Server connection", ec);	×
298	return;	×
299	}
300
301	if(auto ptr = self.lock()) {	4✔
302	ptr->server_read(boost::system::error_code(), 0); // start read loop	4✔
303	ptr->proxy_write_to_server({});	4✔
304	} else {
305	log_error("Server connection established, but client session already closed");	×
306	return;	×
307	}	4✔
308	};	4✔
309	async_connect(m_server_socket, m_server_endpoints.begin(), m_server_endpoints.end(), onConnect);	8✔
310	}	4✔
311
312	void tls_session_established(const Botan::TLS::Session_Summary& session) override {	4✔
313	m_hostname = session.server_info().hostname();	4✔
314	}	4✔
315
316	void tls_alert(Botan::TLS::Alert alert) override {	×
317	if(alert.type() == Botan::TLS::Alert::CloseNotify) {	×
318	m_tls->close();	×
319	return;	×
320	}
321	}
322
323	boost::asio::io_context::strand m_strand;
324
325	tcp::resolver::results_type m_server_endpoints;
326
327	tcp::socket m_client_socket;
328	tcp::socket m_server_socket;
329
330	std::shared_ptr<Botan::RandomNumberGenerator> m_rng;
331	std::unique_ptr<Botan::TLS::Server> m_tls;
332	std::string m_hostname;
333
334	std::vector<uint8_t> m_c2p;
335	std::vector<uint8_t> m_p2c;
336	std::vector<uint8_t> m_p2c_pending;
337
338	std::vector<uint8_t> m_s2p;
339	std::vector<uint8_t> m_p2s;
340	std::vector<uint8_t> m_p2s_pending;
341
342	bool m_is_closed = false;
343	};
344
345	class tls_proxy_server final {
346	public:
347	typedef tls_proxy_session session;
348
349	tls_proxy_server(boost::asio::io_context& io,	1✔
350	unsigned short port,
351	tcp::resolver::results_type endpoints,
352	std::shared_ptr<Botan::Credentials_Manager> creds,
353	std::shared_ptr<Botan::TLS::Policy> policy,
354	std::shared_ptr<Botan::TLS::Session_Manager> session_mgr,
355	size_t max_clients) :	1✔
356	m_acceptor(io, tcp::endpoint(tcp::v4(), port)),	1✔
357	m_server_endpoints(std::move(endpoints)),	1✔
358	m_creds(std::move(creds)),	1✔
359	m_policy(std::move(policy)),	1✔
360	m_session_manager(std::move(session_mgr)),	1✔
361	m_status(max_clients) {	1✔
362	log_info("Listening for new connections on port " + std::to_string(port));	3✔
363	serve_one_session();	1✔
364	}	1✔
365
366	private:
367	session::pointer make_session() {	4✔
368	return session::create(get_io_service(m_acceptor), m_session_manager, m_creds, m_policy, m_server_endpoints);	4✔
369	}
370
371	void serve_one_session() {	4✔
372	session::pointer new_session = make_session();	4✔
373
374	m_acceptor.async_accept(	8✔
375	new_session->client_socket(),	4✔
376	boost::bind(&tls_proxy_server::handle_accept, this, new_session, boost::asio::placeholders::error));	12✔
377	}	4✔
378
379	void handle_accept(const session::pointer& new_session, const boost::system::error_code& error) {	4✔
380	if(!error) {	4✔
381	new_session->start();	4✔
382	m_status.client_serviced();	4✔
383
384	if(!m_status.should_exit()) {	4✔
385	serve_one_session();	3✔
386	}
387	}
388	}	4✔
389
390	tcp::acceptor m_acceptor;
391	tcp::resolver::results_type m_server_endpoints;
392
393	std::shared_ptr<Botan::Credentials_Manager> m_creds;
394	std::shared_ptr<Botan::TLS::Policy> m_policy;
395	std::shared_ptr<Botan::TLS::Session_Manager> m_session_manager;
396	ServerStatus m_status;
397	};
398
399	} // namespace
400
401	class TLS_Proxy final : public Command {
402	public:
403	TLS_Proxy() :	2✔
404	Command(
405	"tls_proxy listen_port target_host target_port server_cert server_key "
406	"--policy=default --threads=0 --max-clients=0 --session-db= --session-db-pass=") {}	4✔
407
408	std::string group() const override { return "tls"; }	1✔
409
410	std::string description() const override { return "Proxies requests between a TLS client and a TLS server"; }	1✔
411
412	size_t thread_count() const {	1✔
413	if(size_t t = get_arg_sz("threads")) {	1✔
414	return t;
415	}
416	#if defined(BOTAN_HAS_OS_UTILS)
417	if(size_t t = Botan::OS::get_cpu_available()) {	1✔
418	return t;	1✔
419	}
420	#endif
421	return 2;
422	}
423
424	void go() override {	1✔
425	const uint16_t listen_port = get_arg_u16("listen_port");	1✔
426	const std::string target = get_arg("target_host");	1✔
427	const std::string target_port = get_arg("target_port");	1✔
428
429	const std::string server_crt = get_arg("server_cert");	1✔
430	const std::string server_key = get_arg("server_key");	1✔
431
432	const size_t num_threads = thread_count();	1✔
433	const size_t max_clients = get_arg_sz("max-clients");	1✔
434
435	auto creds = std::make_shared<Basic_Credentials_Manager>(server_crt, server_key);	1✔
436
437	auto policy = load_tls_policy(get_arg("policy"));	2✔
438
439	boost::asio::io_context io;	1✔
440
441	tcp::resolver resolver(io);	1✔
442	auto server_endpoint_iterator = resolver.resolve(target, target_port);	1✔
443
444	std::shared_ptr<Botan::TLS::Session_Manager> session_mgr;	1✔
445
446	#if defined(BOTAN_HAS_TLS_SQLITE3_SESSION_MANAGER)
447	const std::string sessions_passphrase = get_passphrase_arg("Session DB passphrase", "session-db-pass");	2✔
448	const std::string sessions_db = get_arg("session-db");	1✔
449
450	if(!sessions_db.empty()) {	1✔
451	session_mgr =	×
452	std::make_shared<Botan::TLS::Session_Manager_SQLite>(sessions_passphrase, rng_as_shared(), sessions_db);	×
453	}
454	#endif
455	if(!session_mgr) {	1✔
456	session_mgr = std::make_shared<Botan::TLS::Session_Manager_In_Memory>(rng_as_shared());	3✔
457	}
458
459	tls_proxy_server server(io, listen_port, server_endpoint_iterator, creds, policy, session_mgr, max_clients);	2✔
460
461	std::vector<std::shared_ptr<std::thread>> threads;	1✔
462
463	// run forever... first thread is main calling io.run below
464	for(size_t i = 2; i <= num_threads; ++i) {	4✔
465	threads.push_back(std::make_shared<std::thread>([&io]() { io.run(); }));	6✔
466	}
467
468	io.run();	1✔
469
470	for(size_t i = 0; i < threads.size(); ++i) {	4✔
471	threads[i]->join();	3✔
472	}
473	}	5✔
474	};
475
476	// NOLINTEND(-avoid-endl,-avoid-bind)
477
478	BOTAN_REGISTER_COMMAND("tls_proxy", TLS_Proxy);	2✔
479
480	} // namespace Botan_CLI
481
482	#endif

randombit / botan / 16055899095

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