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// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the Andrey N. Sabelnikov nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
#ifndef _NET_SSL_H
#define _NET_SSL_H
#include <stdint.h>
#include <string>
#include <vector>
#include <boost/utility/string_ref.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/ssl.hpp>
#include <boost/system/error_code.hpp>
namespace epee
{
namespace net_utils
{
enum class ssl_support_t: uint8_t {
e_ssl_support_disabled,
e_ssl_support_enabled,
e_ssl_support_autodetect,
};
enum class ssl_verification_t : uint8_t
{
none = 0, //!< Do not verify peer.
system_ca, //!< Verify peer via system ca only (do not inspect user certificates)
user_certificates,//!< Verify peer via specific (non-chain) certificate(s) only.
user_ca //!< Verify peer via specific (possibly chain) certificate(s) only.
};
struct ssl_authentication_t
{
std::string private_key_path; //!< Private key used for authentication
std::string certificate_path; //!< Certificate used for authentication to peer.
//! Load `private_key_path` and `certificate_path` into `ssl_context`.
void use_ssl_certificate(boost::asio::ssl::context &ssl_context) const;
};
/*!
\note `verification != disabled && support == disabled` is currently
"allowed" via public interface but obviously invalid configuation.
*/
class ssl_options_t
{
// force sorted behavior in private
std::vector<std::vector<std::uint8_t>> fingerprints_;
public:
std::string ca_path;
ssl_authentication_t auth;
ssl_support_t support;
ssl_verification_t verification;
//! Verification is set to system ca unless SSL is disabled.
ssl_options_t(ssl_support_t support)
: fingerprints_(),
ca_path(),
auth(),
support(support),
verification(support == ssl_support_t::e_ssl_support_disabled ? ssl_verification_t::none : ssl_verification_t::system_ca)
{}
//! Provide user fingerprints and/or ca path. Enables SSL and user_certificate verification
ssl_options_t(std::vector<std::vector<std::uint8_t>> fingerprints, std::string ca_path);
ssl_options_t(const ssl_options_t&) = default;
ssl_options_t(ssl_options_t&&) = default;
ssl_options_t& operator=(const ssl_options_t&) = default;
ssl_options_t& operator=(ssl_options_t&&) = default;
//! \return False iff ssl is disabled, otherwise true.
explicit operator bool() const noexcept { return support != ssl_support_t::e_ssl_support_disabled; }
//! \retrurn True if `host` can be verified using `this` configuration WITHOUT system "root" CAs.
bool has_strong_verification(boost::string_ref host) const noexcept;
//! Search against internal fingerprints. Always false if `behavior() != user_certificate_check`.
bool has_fingerprint(boost::asio::ssl::verify_context &ctx) const;
boost::asio::ssl::context create_context() const;
/*! \note If `this->support == autodetect && this->verification != none`,
then the handshake will not fail when peer verification fails. The
assumption is that a re-connect will be attempted, so a warning is
logged instead of failure.
\note It is strongly encouraged that clients using `system_ca`
verification provide a non-empty `host` for rfc2818 verification.
\param socket Used in SSL handshake and verification
\param type Client or server
\param host This parameter is only used when
`type == client && !host.empty()`. The value is sent to the server for
situations where multiple hostnames are being handled by a server. If
`verification == system_ca` the client also does a rfc2818 check to
ensure that the server certificate is to the provided hostname.
\return True if the SSL handshake completes with peer verification
settings. */
bool handshake(boost::asio::ssl::stream<boost::asio::ip::tcp::socket> &socket, boost::asio::ssl::stream_base::handshake_type type, const std::string& host = {}) const;
};
// https://security.stackexchange.com/questions/34780/checking-client-hello-for-https-classification
constexpr size_t get_ssl_magic_size() { return 9; }
bool is_ssl(const unsigned char *data, size_t len);
bool ssl_support_from_string(ssl_support_t &ssl, boost::string_ref s);
}
}
#endif //_NET_SSL_H
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