ObjFW  Diff

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 */

#include "config.h"

#include <errno.h>

#import "OFGnuTLSTLSStream.h"
#import "OFArray.h"
#import "OFData.h"
#import "OFGnuTLSX509Certificate.h"
#import "OFGnuTLSX509CertificatePrivateKey.h"

#import "OFAlreadyOpenException.h"
#import "OFInitializationFailedException.h"
#import "OFNotOpenException.h"
#import "OFReadFailedException.h"
#import "OFTLSHandshakeFailedException.h"
#import "OFWriteFailedException.h"

int _ObjFWTLS_reference;
static gnutls_certificate_credentials_t systemTrustCreds;

#ifndef GNUTLS_SAFE_PADDING_CHECK
/* Some older versions don't have it. */
# define GNUTLS_SAFE_PADDING_CHECK 0
#endif

static OFTLSStreamErrorCode
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+ (void)load
{
	if (OFTLSStreamImplementation == Nil)
		OFTLSStreamImplementation = self;
}

+ (void)initialize
{
	if (self != [OFGnuTLSTLSStream class])
		return;

	if (gnutls_certificate_allocate_credentials(&systemTrustCreds) !=
	    GNUTLS_E_SUCCESS ||
	    gnutls_certificate_set_x509_system_trust(systemTrustCreds) < 0)
		@throw [OFInitializationFailedException exception];
}

- (instancetype)initWithStream: (OFStream <OFReadyForReadingObserving,
				     OFReadyForWritingObserving> *)stream
{
	self = [super initWithStream: stream];

	@try {
		_underlyingStream.delegate = self;
	} @catch (id e) {
		[self release];
		@throw e;
	}

	return self;
}

- (void)dealloc
{
	if (_initialized)
		[self close];
	[self close];

	[_host release];

	[super dealloc];
}

- (void)close
{
	if (!_initialized)
		@throw [OFNotOpenException exceptionWithObject: self];

	if (_handshakeDone)
		gnutls_bye(_session, GNUTLS_SHUT_WR);

	if (_session != NULL)
	gnutls_deinit(_session);
	_initialized = _handshakeDone = false;
		gnutls_deinit(_session);

	if (_credentials != NULL)
		gnutls_certificate_free_credentials(_credentials);

	_session = NULL;
	_credentials = NULL;
	_handshakeDone = false;

	[_host release];
	_host = nil;

	[super close];
}
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- (bool)lowlevelHasDataInReadBuffer
{
	return (_underlyingStream.hasDataInReadBuffer ||
	    gnutls_record_check_pending(_session) > 0);
}

- (void)asyncPerformClientHandshakeWithHost: (OFString *)host
				runLoopMode: (OFRunLoopMode)runLoopMode
- (void)of_asyncPerformHandshakeWithHost: (OFString *)host
				  server: (bool)server
			     runLoopMode: (OFRunLoopMode)runLoopMode
{
	static const OFTLSStreamErrorCode initFailedErrorCode =
	    OFTLSStreamErrorCodeInitializationFailed;
	void *pool = objc_autoreleasePoolPush();
	id exception = nil;
	int status;

	if (_initialized)
	if (_handshakeDone)
		@throw [OFAlreadyOpenException exceptionWithObject: self];

	if (gnutls_init(&_session, GNUTLS_CLIENT | GNUTLS_NONBLOCK |
	    GNUTLS_SAFE_PADDING_CHECK) != GNUTLS_E_SUCCESS)
	if (gnutls_init(&_session, (server ? GNUTLS_SERVER : GNUTLS_CLIENT) |
	    GNUTLS_NONBLOCK | GNUTLS_SAFE_PADDING_CHECK) != GNUTLS_E_SUCCESS)
		@throw [OFTLSHandshakeFailedException
		    exceptionWithStream: self
				   host: host
			      errorCode: initFailedErrorCode];

	_initialized = true;

	gnutls_transport_set_ptr(_session, self);
	gnutls_transport_set_pull_function(_session, readFunc);
	gnutls_transport_set_push_function(_session, writeFunc);

	if (gnutls_set_default_priority(_session) != GNUTLS_E_SUCCESS ||
	    gnutls_credentials_set(_session, GNUTLS_CRD_CERTIFICATE,
	    systemTrustCreds) != GNUTLS_E_SUCCESS)
	    gnutls_certificate_allocate_credentials(&_credentials) !=
	    GNUTLS_E_SUCCESS ||
	    gnutls_certificate_set_x509_system_trust(_credentials) < 0)
		@throw [OFTLSHandshakeFailedException
		    exceptionWithStream: self
				   host: host
			      errorCode: initFailedErrorCode];

	_host = [host copy];
	_server = server;

	if (!server) {
	if (gnutls_server_name_set(_session, GNUTLS_NAME_DNS,
	    _host.UTF8String, _host.UTF8StringLength) != GNUTLS_E_SUCCESS)
		if (gnutls_server_name_set(_session, GNUTLS_NAME_DNS,
		    _host.UTF8String, _host.UTF8StringLength) !=
		    GNUTLS_E_SUCCESS)
			@throw [OFTLSHandshakeFailedException
			    exceptionWithStream: self
					   host: host
				      errorCode: initFailedErrorCode];

		if (_verifiesCertificates)
			gnutls_session_set_verify_cert(_session, _host.UTF8String, 0);
	}

	if (_certificateChain != nil) {
		OFMutableData *certs = [OFMutableData
		    dataWithItemSize: sizeof(gnutls_x509_crt_t)
			    capacity: _certificateChain.count];

		for (OFGnuTLSX509Certificate *cert in _certificateChain) {
			gnutls_x509_crt_t gnuTLSCert =
			    cert.of_gnuTLSCertificate;
			[certs addItem: &gnuTLSCert];
		}

		if (gnutls_certificate_set_x509_key(_credentials,
		    (gnutls_x509_crt_t *)certs.items, (unsigned int)certs.count,
		    [_privateKey of_gnuTLSPrivateKey]) < 0)
			@throw [OFTLSHandshakeFailedException
			    exceptionWithStream: self
					   host: host
				      errorCode: initFailedErrorCode];
	}

	if (gnutls_credentials_set(_session, GNUTLS_CRD_CERTIFICATE,
	    _credentials) != GNUTLS_E_SUCCESS)
		@throw [OFTLSHandshakeFailedException
		    exceptionWithStream: self
				   host: host
			      errorCode: initFailedErrorCode];

	if (_verifiesCertificates)
		gnutls_session_set_verify_cert(_session, _host.UTF8String, 0);

	status = gnutls_handshake(_session);

	if (status == GNUTLS_E_INTERRUPTED || status == GNUTLS_E_AGAIN) {
		if (gnutls_record_get_direction(_session) == 1)
			[_underlyingStream asyncWriteData: [OFData data]
					      runLoopMode: runLoopMode];
		else
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		/* FIXME: Map to better errors */
		exception = [OFTLSHandshakeFailedException
		    exceptionWithStream: self
				   host: host
			      errorCode: errorCode];
	}

	if (server) {
	if ([_delegate respondsToSelector:
	    @selector(stream:didPerformClientHandshakeWithHost:exception:)])
		[_delegate		       stream: self
		    didPerformClientHandshakeWithHost: host
					    exception: exception];

		if ([_delegate respondsToSelector: @selector(
		    streamDidPerformServerHandshake:exception:)])
			[_delegate streamDidPerformServerHandshake: self
							 exception: exception];
	} else {
		if ([_delegate respondsToSelector: @selector(stream:
		    didPerformClientHandshakeWithHost:exception:)])
			[_delegate		       stream: self
			    didPerformClientHandshakeWithHost: host
						    exception: exception];
	}

	objc_autoreleasePoolPop(pool);
}

- (void)asyncPerformClientHandshakeWithHost: (OFString *)host
				runLoopMode: (OFRunLoopMode)runLoopMode
{
	[self of_asyncPerformHandshakeWithHost: host
					server: false
				   runLoopMode: runLoopMode];
}

- (void)asyncPerformServerHandshakeWithRunLoopMode: (OFRunLoopMode)runLoopMode
{
	[self of_asyncPerformHandshakeWithHost: nil
					server: true
				   runLoopMode: runLoopMode];
}

-      (bool)stream: (OFStream *)stream
  didReadIntoBuffer: (void *)buffer
	     length: (size_t)length
	  exception: (id)exception
{
	if (exception == nil) {
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		else
			exception = [OFTLSHandshakeFailedException
			    exceptionWithStream: self
					   host: _host
				      errorCode: OFTLSStreamErrorCodeUnknown];
	}

	if (_server) {
	if ([_delegate respondsToSelector:
	    @selector(stream:didPerformClientHandshakeWithHost:exception:)])
		[_delegate		       stream: self
		    didPerformClientHandshakeWithHost: _host
					    exception: exception];
		if ([_delegate respondsToSelector: @selector(
		    streamDidPerformServerHandshake:exception:)])
			[_delegate streamDidPerformServerHandshake: self
							 exception: exception];
	} else {
		if ([_delegate respondsToSelector: @selector(stream:
		    didPerformClientHandshakeWithHost:exception:)])
			[_delegate		       stream: self
			    didPerformClientHandshakeWithHost: _host
						    exception: exception];
	}

	[_delegate release];

	return false;
}

- (OFData *)stream: (OFStream *)stream
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		else
			exception = [OFTLSHandshakeFailedException
			    exceptionWithStream: self
					   host: _host
				      errorCode: OFTLSStreamErrorCodeUnknown];
	}

	if (_server) {
	if ([_delegate respondsToSelector:
	    @selector(stream:didPerformClientHandshakeWithHost:exception:)])
		[_delegate		       stream: self
		    didPerformClientHandshakeWithHost: _host
					    exception: exception];
		if ([_delegate respondsToSelector: @selector(
		    streamDidPerformServerHandshake:exception:)])
			[_delegate streamDidPerformServerHandshake: self
							 exception: exception];
	} else {
		if ([_delegate respondsToSelector: @selector(stream:
		    didPerformClientHandshakeWithHost:exception:)])
			[_delegate		       stream: self
			    didPerformClientHandshakeWithHost: _host
						    exception: exception];
	}

	[_delegate release];

	return nil;
}
@end