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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "crypto/apple_keychain.h"
#import <Foundation/Foundation.h>
#include "base/mac/foundation_util.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/mac/scoped_nsobject.h"
namespace {
enum KeychainAction {
kKeychainActionCreate,
kKeychainActionUpdate
};
// Creates a dictionary that can be used to query the keystore.
// Ownership follows the Create rule.
CFDictionaryRef CreateGenericPasswordQuery(UInt32 serviceNameLength,
const char* serviceName,
UInt32 accountNameLength,
const char* accountName) {
CFMutableDictionaryRef query =
CFDictionaryCreateMutable(NULL,
5,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
// Type of element is generic password.
CFDictionarySetValue(query, kSecClass, kSecClassGenericPassword);
// Set the service name.
base::scoped_nsobject<NSString> service_name_ns(
[[NSString alloc] initWithBytes:serviceName
length:serviceNameLength
encoding:NSUTF8StringEncoding]);
CFDictionarySetValue(query, kSecAttrService,
base::mac::NSToCFCast(service_name_ns));
// Set the account name.
base::scoped_nsobject<NSString> account_name_ns(
[[NSString alloc] initWithBytes:accountName
length:accountNameLength
encoding:NSUTF8StringEncoding]);
CFDictionarySetValue(query, kSecAttrAccount,
base::mac::NSToCFCast(account_name_ns));
// Use the proper search constants, return only the data of the first match.
CFDictionarySetValue(query, kSecMatchLimit, kSecMatchLimitOne);
CFDictionarySetValue(query, kSecReturnData, kCFBooleanTrue);
return query;
}
// Creates a dictionary conatining the data to save into the keychain.
// Ownership follows the Create rule.
CFDictionaryRef CreateKeychainData(UInt32 serviceNameLength,
const char* serviceName,
UInt32 accountNameLength,
const char* accountName,
UInt32 passwordLength,
const void* passwordData,
KeychainAction action) {
CFMutableDictionaryRef keychain_data =
CFDictionaryCreateMutable(NULL,
0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
// Set the password.
NSData* password = [NSData dataWithBytes:passwordData length:passwordLength];
CFDictionarySetValue(keychain_data, kSecValueData,
base::mac::NSToCFCast(password));
// If this is not a creation, no structural information is needed.
if (action != kKeychainActionCreate)
return keychain_data;
// Set the type of the data.
CFDictionarySetValue(keychain_data, kSecClass, kSecClassGenericPassword);
// Only allow access when the device has been unlocked.
CFDictionarySetValue(keychain_data,
kSecAttrAccessible,
kSecAttrAccessibleWhenUnlocked);
// Set the service name.
base::scoped_nsobject<NSString> service_name_ns(
[[NSString alloc] initWithBytes:serviceName
length:serviceNameLength
encoding:NSUTF8StringEncoding]);
CFDictionarySetValue(keychain_data, kSecAttrService,
base::mac::NSToCFCast(service_name_ns));
// Set the account name.
base::scoped_nsobject<NSString> account_name_ns(
[[NSString alloc] initWithBytes:accountName
length:accountNameLength
encoding:NSUTF8StringEncoding]);
CFDictionarySetValue(keychain_data, kSecAttrAccount,
base::mac::NSToCFCast(account_name_ns));
return keychain_data;
}
} // namespace
namespace crypto {
AppleKeychain::AppleKeychain() {}
AppleKeychain::~AppleKeychain() {}
OSStatus AppleKeychain::ItemFreeContent(SecKeychainAttributeList* attrList,
void* data) const {
free(data);
return noErr;
}
OSStatus AppleKeychain::AddGenericPassword(SecKeychainRef keychain,
UInt32 serviceNameLength,
const char* serviceName,
UInt32 accountNameLength,
const char* accountName,
UInt32 passwordLength,
const void* passwordData,
SecKeychainItemRef* itemRef) const {
base::ScopedCFTypeRef<CFDictionaryRef> query(CreateGenericPasswordQuery(
serviceNameLength, serviceName, accountNameLength, accountName));
// Check that there is not already a password.
OSStatus status = SecItemCopyMatching(query, NULL);
if (status == errSecItemNotFound) {
// A new entry must be created.
base::ScopedCFTypeRef<CFDictionaryRef> keychain_data(
CreateKeychainData(serviceNameLength,
serviceName,
accountNameLength,
accountName,
passwordLength,
passwordData,
kKeychainActionCreate));
status = SecItemAdd(keychain_data, NULL);
} else if (status == noErr) {
// The entry must be updated.
base::ScopedCFTypeRef<CFDictionaryRef> keychain_data(
CreateKeychainData(serviceNameLength,
serviceName,
accountNameLength,
accountName,
passwordLength,
passwordData,
kKeychainActionUpdate));
status = SecItemUpdate(query, keychain_data);
}
return status;
}
OSStatus AppleKeychain::FindGenericPassword(CFTypeRef keychainOrArray,
UInt32 serviceNameLength,
const char* serviceName,
UInt32 accountNameLength,
const char* accountName,
UInt32* passwordLength,
void** passwordData,
SecKeychainItemRef* itemRef) const {
DCHECK((passwordData && passwordLength) ||
(!passwordData && !passwordLength));
base::ScopedCFTypeRef<CFDictionaryRef> query(CreateGenericPasswordQuery(
serviceNameLength, serviceName, accountNameLength, accountName));
// Get the keychain item containing the password.
CFTypeRef resultRef = NULL;
OSStatus status = SecItemCopyMatching(query, &resultRef);
base::ScopedCFTypeRef<CFTypeRef> result(resultRef);
if (status != noErr) {
if (passwordData) {
*passwordData = NULL;
*passwordLength = 0;
}
return status;
}
if (passwordData) {
CFDataRef data = base::mac::CFCast<CFDataRef>(result);
NSUInteger length = CFDataGetLength(data);
*passwordData = malloc(length * sizeof(UInt8));
CFDataGetBytes(data, CFRangeMake(0, length), (UInt8*)*passwordData);
*passwordLength = length;
}
return status;
}
} // namespace crypto
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