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ONBSSLContext.m
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ONBSSLContext.m
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// This code derives from Aaron Jacobs's OneButton Socket, which was
// at the time of writing normally licensed under the terms of the
// GNU General Public License. You can find the "standard" version
// in the CVS repository of OneButton FTP (www.onebutton.org).
//
// The SPECIFIC INCARNATION of OneButton Socket upon which this
// code is based was specially distributed to Greg Hulands on 2006-01-05
// under the terms of a modified BSD-style license rather than the GPL.
// This does not indicate that any other version of OneButton Socket
// is or will be distributed under any license but the GPL.
/*
* Copyright (c) 2005, Aaron Jacobs.
* 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 two paragraph
* note about licensing of OneButton Socket, 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 Aaron Jacobs nor the names of OneButton Socket or
* OneButton FTP may be used to endorse or promote products derived from
* this software without specific prior written permission from Aaron Jacobs.
*
* THIS SOFTWARE IS PROVIDED BY AARON JACOBS "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 AARON JACOBS 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.
*/
#import "ONBSSLContext.h"
#import "ONBSSLIdentity.h"
@interface ONBSSLContext ( ONBSSLContextPrivateMethods )
- (OSStatus)ONB_handleSSLReadToData:(void *)data size:(size_t *)size;
- (OSStatus)ONB_handleSSLWriteFromData:(const void *)data size:(size_t *)size;
@end
OSStatus SSLReadFunction(SSLConnectionRef connection, void *data, size_t *dataLength)
{
return [(ONBSSLContext *)connection ONB_handleSSLReadToData:data size:dataLength];
}
OSStatus SSLWriteFunction(SSLConnectionRef connection, const void *data, size_t *dataLength)
{
return [(ONBSSLContext *)connection ONB_handleSSLWriteFromData:data size:dataLength];
}
@implementation ONBSSLContext
- (id)init
{
if (! (self = [super init]))
return nil;
[self setSSLIdentity:nil];
return self;
}
- (void)dealloc
{
[self setSSLIdentity:nil];
[super dealloc];
}
- (int)handshakeWithInputData:(NSMutableData *)inputData
outputData:(NSMutableData *)outputData
{
int ret;
// If we haven't yet set up the SSL context, we should do so now.
if (! ONB_sslContext)
{
if (ret = SSLNewContext((Boolean)[self sslServerMode], &ONB_sslContext))
{
NSLog(@"Error creating new context");
return ret;
}
if (ret = SSLSetIOFuncs(ONB_sslContext, SSLReadFunction, SSLWriteFunction))
{
NSLog(@"Error setting IO Functions");
return ret;
}
if (ret = SSLSetConnection(ONB_sslContext, self))
{
NSLog(@"Error setting connection");
return ret;
}
if (ret = SSLSetEnableCertVerify(ONB_sslContext, (Boolean)[self verifySSLCertificates]))
{
NSLog(@"Error calling SSLSetEnableCertVerify");
return ret;
}
SecIdentityRef identity = [[self sslIdentity] identityRef];
if (identity || [self sslServerMode])
{
CFArrayRef certificates = CFArrayCreate(kCFAllocatorDefault,
(const void **)&identity,
identity ? 1 : 0,
NULL);
ret = SSLSetCertificate(ONB_sslContext, certificates);
CFRelease(certificates);
if (ret)
{
NSLog(@"Error setting certificates: %d", ret);
return ret;
}
else
NSLog(@"Set up certificates");
}
}
ONB_inputData = inputData;
ONB_outputData = outputData;
ret = SSLHandshake(ONB_sslContext);
if (ret == errSSLWouldBlock)
return 0;
if (! ret)
return 1;
return ret;
}
- (NSData *)encryptData:(NSData *)data inputData:(NSMutableData *)inputData
{
if ((! data) || (! [data length]))
return [NSData data];
ONB_inputData = inputData;
ONB_outputData = [NSMutableData dataWithCapacity:2*[data length]];
unsigned int totalLength = [data length];
unsigned int processed = 0;
const void *buffer = [data bytes];
while (processed < totalLength)
{
size_t written = 0;
int ret;
if (ret = SSLWrite(ONB_sslContext, buffer + processed, totalLength - processed, &written))
return nil;
processed += written;
}
return [NSData dataWithData:ONB_outputData];
}
- (NSData *)decryptData:(NSMutableData *)data outputData:(NSMutableData *)outputData
{
if ((! data) || (! [data length]))
return [NSData data];
ONB_inputData = data;
ONB_outputData = outputData;
NSMutableData *decryptedData = [NSMutableData dataWithCapacity:[data length]];
int ret = 0;
while (! ret)
{
size_t read = 0;
char buf[1024];
ret = SSLRead(ONB_sslContext, buf, 1024, &read);
if (ret && (ret != errSSLWouldBlock) && (ret != errSSLClosedGraceful))
{
NSLog(@"Error in SSLRead: %d", ret);
return nil;
}
[decryptedData appendBytes:buf length:read];
}
return [NSData dataWithData:decryptedData];
}
- (BOOL)verifySSLCertificates
{
return ONB_verifySSLCerts;
}
- (void)setVerifySSLCertificates:(BOOL)verifySSLCertificates
{
ONB_verifySSLCerts = verifySSLCertificates;
}
- (ONBSSLIdentity *)sslIdentity
{
return ONB_sslIdentity;
}
- (BOOL)sslServerMode
{
return ONB_sslServerMode;
}
- (void)setSSLServerMode:(BOOL)sslServerMode
{
ONB_sslServerMode = sslServerMode;
}
- (void)setSSLIdentity:(ONBSSLIdentity *)sslIdentity
{
[ONB_sslIdentity autorelease];
ONB_sslIdentity = [sslIdentity retain];
}
- (OSStatus)ONB_handleSSLWriteFromData:(const void *)data size:(size_t *)size
{
[ONB_outputData appendBytes:data length:*size];
return noErr;
}
- (OSStatus)ONB_handleSSLReadToData:(void *)data size:(size_t *)size
{
size_t askedSize = *size;
*size = MIN(askedSize, [ONB_inputData length]);
if (! *size)
{
return errSSLWouldBlock;
}
NSRange byteRange = NSMakeRange(0, *size);
[ONB_inputData getBytes:data range:byteRange];
[ONB_inputData replaceBytesInRange:byteRange withBytes:NULL length:0];
if (askedSize > *size)
return errSSLWouldBlock;
return noErr;
}
@end