CFDataRef SecKeyCreatePersistentRefToMatchingPrivateKey(SecKeyRef publicKey, CFErrorRef *error) {
CFTypeRef persistentRef = NULL;
CFDictionaryRef query = CreatePrivateKeyMatchingQuery(publicKey, true);
require_quiet(SecError(SecItemCopyMatching(query, &persistentRef),error ,
CFSTR("Error finding persistent ref to key from public: %@"), publicKey), fail);
fail:
CFReleaseNull(query);
return (CFDataRef)persistentRef;
}
SecKeyRef SecKeyCopyMatchingPrivateKey(SecKeyRef publicKey, CFErrorRef *error) {
CFTypeRef private_key = NULL;
CFDictionaryRef query = CreatePrivateKeyMatchingQuery(publicKey, false);
require_quiet(SecError(SecItemCopyMatching(query, &private_key), error,
CFSTR("Error finding private key from public: %@"), publicKey), fail);
fail:
CFReleaseNull(query);
return (SecKeyRef)private_key;
}
CFDataRef SOSItemCopy(CFStringRef service, CFErrorRef* error)
{
CFDictionaryRef query = SOSItemCopyQueryForSyncItems(service, true);
CFDataRef result = NULL;
OSStatus copyResult = SecItemCopyMatching(query, (CFTypeRef*) &result);
CFReleaseNull(query);
if (copyResult != noErr) {
SecError(copyResult, error, CFSTR("Error %@ reading for service '%@'"), result, service);
CFReleaseNull(result);
return NULL;
}
if (!isData(result)) {
SOSCreateErrorWithFormat(kSOSErrorProcessingFailure, NULL, error, NULL, CFSTR("SecItemCopyMatching returned non-data in '%@'"), service);
CFReleaseNull(result);
return NULL;
}
return result;
}
SOSCoderStatus SOSCoderUnwrap(SOSCoderRef coder, CFDataRef codedMessage, CFMutableDataRef *message,
CFStringRef clientId, CFErrorRef *error) {
if(codedMessage == NULL) return kSOSCoderDataReturned;
if(coder->sessRef == NULL) return nullCoder(codedMessage, message);
CFMutableStringRef action = CFStringCreateMutable(kCFAllocatorDefault, 0);
/* This should be the "normal" case. We just use OTR to unwrap the received message. */
SOSCoderStatus result = kSOSCoderFailure;
CFStringRef beginState = CFCopyDescription(coder->sessRef);
enum SecOTRSMessageKind kind = SecOTRSGetMessageKind(coder->sessRef, codedMessage);
switch (kind) {
case kOTRNegotiationPacket: {
/* If we're in here we haven't completed negotiating a session. Use SecOTRSProcessPacket() to go through
the negotiation steps and immediately send a reply back if necessary using the sendBlock. This
assumes the sendBlock is still available.
*/
CFMutableDataRef response = CFDataCreateMutable(kCFAllocatorDefault, 0);
OSStatus ppstatus = errSecSuccess;
if (response) {
switch (ppstatus = SecOTRSProcessPacket(coder->sessRef, codedMessage, response)) {
case errSecSuccess:
if (CFDataGetLength(response) > 1) {
CFStringAppendFormat(action, NULL, CFSTR("Sending OTR Response %s"), SecOTRPacketTypeString(response));
CFRetainAssign(coder->pendingResponse, response);
result = kSOSCoderNegotiating;
if (SecOTRSGetIsReadyForMessages(coder->sessRef)) {
CFStringAppend(action, CFSTR(" begin waiting for data packet"));
coder->waitingForDataPacket = true;
}
} else if(!SecOTRSGetIsReadyForMessages(coder->sessRef)) {
CFStringAppend(action, CFSTR("stuck?"));
result = kSOSCoderNegotiating;
} else {
CFStringAppend(action, CFSTR("completed negotiation"));
result = kSOSCoderNegotiationCompleted;
coder->waitingForDataPacket = false;
}
break;
case errSecDecode:
CFStringAppend(action, CFSTR("resending dh"));
result = SOSCoderResendDH(coder, error);
break;
default:
SOSCreateErrorWithFormat(kSOSErrorEncodeFailure, (error != NULL) ? *error : NULL, error, NULL, CFSTR("%@ Cannot negotiate session (%ld)"), clientId, (long)ppstatus);
result = kSOSCoderFailure;
break;
};
} else {
SOSCreateErrorWithFormat(kSOSErrorAllocationFailure, (error != NULL) ? *error : NULL, error, NULL, CFSTR("%@ Cannot allocate CFData"), clientId);
result = kSOSCoderFailure;
}
CFReleaseNull(response);
break;
}
case kOTRDataPacket:
if(!SecOTRSGetIsReadyForMessages(coder->sessRef)) {
CFStringAppend(action, CFSTR("not ready, resending DH packet"));
SetCloudKeychainTraceValueForKey(kCloudKeychainNumberOfTimesSyncFailed, 1);
CFStringAppend(action, CFSTR("not ready for data; resending dh"));
result = SOSCoderResendDH(coder, error);
} else {
if (coder->waitingForDataPacket) {
CFStringAppend(action, CFSTR("got data packet we were waiting for "));
coder->waitingForDataPacket = false;
}
CFMutableDataRef exposed = CFDataCreateMutable(0, 0);
OSStatus otrResult = SecOTRSVerifyAndExposeMessage(coder->sessRef, codedMessage, exposed);
CFStringAppend(action, CFSTR("verify and expose message"));
if (otrResult) {
if (otrResult == errSecOTRTooOld) {
CFStringAppend(action, CFSTR(" too old"));
result = kSOSCoderStaleEvent;
} else {
SecError(otrResult, error, CFSTR("%@ Cannot expose message: %" PRIdOSStatus), clientId, otrResult);
secerror("%@ Decode OTR Protected Packet: %@", clientId, error ? *error : NULL);
result = kSOSCoderFailure;
}
} else {
CFStringAppend(action, CFSTR("decoded OTR protected packet"));
*message = exposed;
exposed = NULL;
result = kSOSCoderDataReturned;
}
CFReleaseNull(exposed);
}
break;
default:
secerror("%@ Unknown packet type: %@", clientId, codedMessage);
SOSCreateError(kSOSErrorDecodeFailure, CFSTR("Unknown packet type"), (error != NULL) ? *error : NULL, error);
result = kSOSCoderFailure;
break;
};
// Uber state log
if (result == kSOSCoderFailure && error && *error)
CFStringAppendFormat(action, NULL, CFSTR(" %@"), *error);
secnotice("coder", "%@ %@ %s %@ %@ returned %s", clientId, beginState,
SecOTRPacketTypeString(codedMessage), action, coder->sessRef, SOSCoderString(result));
CFReleaseSafe(beginState);
CFRelease(action);
return result;
}
