SecOTRRemote.m   [plain text]

/*
* Copyright (c) 2014 Apple Inc. All Rights Reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
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*/

#include "AssertMacros.h"
#include <stdio.h>
#include "SecOTRRemote.h"
#include <Security/SecOTRSession.h>
#include <Security/SecOTRIdentityPriv.h>
#include "keychain/securityd/SecItemServer.h"
#include "keychain/securityd/SOSCloudCircleServer.h"

#include "SOSAccountPriv.h"

#import "keychain/SecureObjectSync/SOSAccountTrustClassic.h"

CFDataRef SecOTRSessionCreateRemote_internal(CFDataRef publicAccountData, CFDataRef publicPeerId, CFDataRef privateAccountData, CFErrorRef *error) {
SOSDataSourceFactoryRef ds = SecItemDataSourceFactoryGetDefault();

SOSAccount* privateAccount = NULL;
SOSAccount* publicAccount = NULL;
CFStringRef publicKeyString = NULL;
SecKeyRef privateKeyRef = NULL;
SecKeyRef publicKeyRef = NULL;
SecOTRFullIdentityRef privateIdentity = NULL;
SecOTRPublicIdentityRef publicIdentity = NULL;
CFDataRef result = NULL;
SecOTRSessionRef ourSession = NULL;

require_quiet(ds, fail);
require_quiet(publicPeerId, fail);

if (privateAccountData) {
NSError* ns_error = nil;
privateAccount = [SOSAccount accountFromData:(__bridge NSData*) privateAccountData factory:ds error:&ns_error];
if (error && *error == NULL && !privateAccount) {
*error = (CFErrorRef) CFBridgingRetain(ns_error);
}
} else {
privateAccount = (__bridge SOSAccount*)(SOSKeychainAccountGetSharedAccount());
}

require_quiet(privateAccount, fail);

privateKeyRef = SOSAccountCopyDeviceKey(privateAccount, error);
require_quiet(privateKeyRef, fail);

privateIdentity = SecOTRFullIdentityCreateFromSecKeyRef(kCFAllocatorDefault, privateKeyRef, error);
require_quiet(privateIdentity, fail);
CFReleaseNull(privateKeyRef);

publicKeyString = CFStringCreateFromExternalRepresentation(kCFAllocatorDefault, publicPeerId, kCFStringEncodingUTF8);
require_quiet(publicKeyString, fail);

if (publicAccountData) {
NSError* ns_error = nil;
publicAccount = [SOSAccount accountFromData:(__bridge NSData*) publicAccountData factory:ds error:&ns_error];
if (error && *error == NULL && !publicAccount) {
*error = (CFErrorRef) CFBridgingRetain(ns_error);
}
} else {
publicAccount = (__bridge SOSAccount*)(SOSKeychainAccountGetSharedAccount());
}

require_quiet(publicAccount, fail);

publicKeyRef = [publicAccount.trust copyPublicKeyForPeer:publicKeyString err:error];

if(!publicKeyRef){
if(!ds){
CFReleaseNull(ourSession);
CFReleaseNull(publicKeyString);
privateAccount= nil;
publicAccount = nil;
CFReleaseNull(privateKeyRef);
CFReleaseNull(publicKeyRef);
CFReleaseNull(publicIdentity);
CFReleaseNull(privateIdentity);
return result;
}
}
publicIdentity = SecOTRPublicIdentityCreateFromSecKeyRef(kCFAllocatorDefault, publicKeyRef, error);
require_quiet(publicIdentity, fail);

CFReleaseNull(publicKeyRef);

ourSession = SecOTRSessionCreateFromID(kCFAllocatorDefault, privateIdentity, publicIdentity);

CFMutableDataRef exportSession = CFDataCreateMutable(kCFAllocatorDefault, 0);
SecOTRSAppendSerialization(ourSession, exportSession);

result = exportSession;
exportSession = NULL;

fail:
CFReleaseNull(ourSession);
CFReleaseNull(publicKeyString);
privateAccount= nil;
publicAccount = nil;
CFReleaseNull(privateKeyRef);
CFReleaseNull(publicKeyRef);
CFReleaseNull(publicIdentity);
CFReleaseNull(privateIdentity);
return result;
}

CFDataRef _SecOTRSessionCreateRemote(CFDataRef publicPeerId, CFErrorRef *error) {
return SecOTRSessionCreateRemote_internal(NULL, publicPeerId, NULL, error);
}

bool _SecOTRSessionProcessPacketRemote(CFDataRef sessionData, CFDataRef inputPacket, CFDataRef* outputSessionData, CFDataRef* outputPacket, bool *readyForMessages, CFErrorRef *error) {

bool result = false;
SecOTRSessionRef session = SecOTRSessionCreateFromData(kCFAllocatorDefault, sessionData);
require_quiet(session, done);

CFMutableDataRef negotiationResponse = CFDataCreateMutable(kCFAllocatorDefault, 0);

if (inputPacket) {
SecOTRSProcessPacket(session, inputPacket, negotiationResponse);
} else {
SecOTRSAppendStartPacket(session, negotiationResponse);
}

CFMutableDataRef outputSession = CFDataCreateMutable(kCFAllocatorDefault, 0);

SecOTRSAppendSerialization(session, outputSession);
*outputSessionData = outputSession;

*outputPacket = negotiationResponse;

*readyForMessages = SecOTRSGetIsReadyForMessages(session);
CFReleaseNull(session);

result = true;

done:
return result;
}