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#ifndef CERT_TRANS_CLIENT_SSL_CLIENT_H_
#define CERT_TRANS_CLIENT_SSL_CLIENT_H_
#include <openssl/ssl.h>
#include <openssl/x509.h>
#include "base/macros.h"
#include "client/client.h"
#include "client/ssl_client.h"
#include "log/log_verifier.h"
#include "proto/ct.pb.h"
#include "util/openssl_scoped_ssl_types.h"
class LogVerifier;
namespace cert_trans {
class SSLClient {
public:
// Takes ownership of the verifier. This client can currently
// only verify SCTs from a single log at a time.
// TODO(ekasper): implement a proper multi-log auditor.
SSLClient(const std::string& server, const std::string& port,
const std::string& ca_dir, LogVerifier* verifier);
~SSLClient();
enum HandshakeResult {
OK = 0,
HANDSHAKE_FAILED = 1,
SERVER_UNAVAILABLE = 2,
};
HandshakeResult SSLConnect() {
return SSLConnect(false);
}
// Same as above but won't proceed without an SCT.
HandshakeResult SSLConnectStrict() {
return SSLConnect(true);
}
bool Connected() const;
void Disconnect();
void GetSSLClientCTData(ct::SSLClientCTData* data) const;
// Need a static wrapper for the callback.
static LogVerifier::LogVerifyResult VerifySCT(const std::string& token,
LogVerifier* verifier,
ct::SSLClientCTData* data);
// Custom verification callback for verifying the SCT token
// in a superfluous certificate. Return values:
// With TLS extension support:
// 1 - cert verified (SCT might still be in TLS extension which is
// parsed in a later callback; we record whether it was verified
// in the callback args)
// other values - cert verification errors.
// Without TLS extension support, strict mode
// 1 - cert and SCT verified
// other values - everything else
// Without TLS extension support, standard mode
// 1 - cert verified (we record whether an SCT was also verified in the
// callback args)
// other values - cert verification error
static int VerifyCallback(X509_STORE_CTX* ctx, void* arg);
static int ExtensionCallback(SSL* s, unsigned ext_type,
const unsigned char* in, size_t inlen, int* al,
void* arg);
private:
Client client_;
cert_trans::ScopedSSL_CTX ctx_;
cert_trans::ScopedSSL ssl_;
struct VerifyCallbackArgs {
VerifyCallbackArgs(LogVerifier* log_verifier)
: verifier(log_verifier),
sct_verified(false),
require_sct(false),
ct_data() {
}
// The verifier for checking log proofs.
std::unique_ptr<LogVerifier> verifier;
// SCT verification result.
bool sct_verified;
bool require_sct;
std::string ct_extension;
// The resulting (partial) entry - the client reconstructs
// the signed part of the entry (i.e., type and leaf certificate)
// and all valid SCTs.
ct::SSLClientCTData ct_data;
};
VerifyCallbackArgs verify_args_;
bool connected_;
// Call before each handshake.
void ResetVerifyCallbackArgs(bool strict);
HandshakeResult SSLConnect(bool strict);
DISALLOW_COPY_AND_ASSIGN(SSLClient);
};
} // namespace cert_trans
#endif // CERT_TRANS_CLIENT_SSL_CLIENT_H_
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