Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "crypto/apple_keychain.h" |
| 6 | |
| 7 | #import <Foundation/Foundation.h> |
| 8 | |
| 9 | #include "base/mac/foundation_util.h" |
| 10 | #include "base/mac/scoped_cftyperef.h" |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 11 | #include "base/mac/scoped_nsobject.h" |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 12 | |
| 13 | namespace { |
| 14 | |
| 15 | enum KeychainAction { |
| 16 | kKeychainActionCreate, |
| 17 | kKeychainActionUpdate |
| 18 | }; |
| 19 | |
| 20 | // Creates a dictionary that can be used to query the keystore. |
| 21 | // Ownership follows the Create rule. |
| 22 | CFDictionaryRef CreateGenericPasswordQuery(UInt32 serviceNameLength, |
| 23 | const char* serviceName, |
| 24 | UInt32 accountNameLength, |
| 25 | const char* accountName) { |
| 26 | CFMutableDictionaryRef query = |
| 27 | CFDictionaryCreateMutable(NULL, |
| 28 | 5, |
| 29 | &kCFTypeDictionaryKeyCallBacks, |
| 30 | &kCFTypeDictionaryValueCallBacks); |
| 31 | // Type of element is generic password. |
| 32 | CFDictionarySetValue(query, kSecClass, kSecClassGenericPassword); |
| 33 | |
| 34 | // Set the service name. |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 35 | base::scoped_nsobject<NSString> service_name_ns( |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 36 | [[NSString alloc] initWithBytes:serviceName |
| 37 | length:serviceNameLength |
| 38 | encoding:NSUTF8StringEncoding]); |
| 39 | CFDictionarySetValue(query, kSecAttrService, |
| 40 | base::mac::NSToCFCast(service_name_ns)); |
| 41 | |
| 42 | // Set the account name. |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 43 | base::scoped_nsobject<NSString> account_name_ns( |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 44 | [[NSString alloc] initWithBytes:accountName |
| 45 | length:accountNameLength |
| 46 | encoding:NSUTF8StringEncoding]); |
| 47 | CFDictionarySetValue(query, kSecAttrAccount, |
| 48 | base::mac::NSToCFCast(account_name_ns)); |
| 49 | |
| 50 | // Use the proper search constants, return only the data of the first match. |
| 51 | CFDictionarySetValue(query, kSecMatchLimit, kSecMatchLimitOne); |
| 52 | CFDictionarySetValue(query, kSecReturnData, kCFBooleanTrue); |
| 53 | return query; |
| 54 | } |
| 55 | |
| 56 | // Creates a dictionary conatining the data to save into the keychain. |
| 57 | // Ownership follows the Create rule. |
| 58 | CFDictionaryRef CreateKeychainData(UInt32 serviceNameLength, |
| 59 | const char* serviceName, |
| 60 | UInt32 accountNameLength, |
| 61 | const char* accountName, |
| 62 | UInt32 passwordLength, |
| 63 | const void* passwordData, |
| 64 | KeychainAction action) { |
| 65 | CFMutableDictionaryRef keychain_data = |
| 66 | CFDictionaryCreateMutable(NULL, |
| 67 | 0, |
| 68 | &kCFTypeDictionaryKeyCallBacks, |
| 69 | &kCFTypeDictionaryValueCallBacks); |
| 70 | |
| 71 | // Set the password. |
| 72 | NSData* password = [NSData dataWithBytes:passwordData length:passwordLength]; |
| 73 | CFDictionarySetValue(keychain_data, kSecValueData, |
| 74 | base::mac::NSToCFCast(password)); |
| 75 | |
| 76 | // If this is not a creation, no structural information is needed. |
| 77 | if (action != kKeychainActionCreate) |
| 78 | return keychain_data; |
| 79 | |
| 80 | // Set the type of the data. |
| 81 | CFDictionarySetValue(keychain_data, kSecClass, kSecClassGenericPassword); |
| 82 | |
| 83 | // Only allow access when the device has been unlocked. |
| 84 | CFDictionarySetValue(keychain_data, |
| 85 | kSecAttrAccessible, |
| 86 | kSecAttrAccessibleWhenUnlocked); |
| 87 | |
| 88 | // Set the service name. |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 89 | base::scoped_nsobject<NSString> service_name_ns( |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 90 | [[NSString alloc] initWithBytes:serviceName |
| 91 | length:serviceNameLength |
| 92 | encoding:NSUTF8StringEncoding]); |
| 93 | CFDictionarySetValue(keychain_data, kSecAttrService, |
| 94 | base::mac::NSToCFCast(service_name_ns)); |
| 95 | |
| 96 | // Set the account name. |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 97 | base::scoped_nsobject<NSString> account_name_ns( |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 98 | [[NSString alloc] initWithBytes:accountName |
| 99 | length:accountNameLength |
| 100 | encoding:NSUTF8StringEncoding]); |
| 101 | CFDictionarySetValue(keychain_data, kSecAttrAccount, |
| 102 | base::mac::NSToCFCast(account_name_ns)); |
| 103 | |
| 104 | return keychain_data; |
| 105 | } |
| 106 | |
| 107 | } // namespace |
| 108 | |
| 109 | namespace crypto { |
| 110 | |
| 111 | AppleKeychain::AppleKeychain() {} |
| 112 | |
| 113 | AppleKeychain::~AppleKeychain() {} |
| 114 | |
| 115 | OSStatus AppleKeychain::ItemFreeContent(SecKeychainAttributeList* attrList, |
| 116 | void* data) const { |
| 117 | free(data); |
| 118 | return noErr; |
| 119 | } |
| 120 | |
| 121 | OSStatus AppleKeychain::AddGenericPassword(SecKeychainRef keychain, |
| 122 | UInt32 serviceNameLength, |
| 123 | const char* serviceName, |
| 124 | UInt32 accountNameLength, |
| 125 | const char* accountName, |
| 126 | UInt32 passwordLength, |
| 127 | const void* passwordData, |
| 128 | SecKeychainItemRef* itemRef) const { |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 129 | base::ScopedCFTypeRef<CFDictionaryRef> query(CreateGenericPasswordQuery( |
| 130 | serviceNameLength, serviceName, accountNameLength, accountName)); |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 131 | // Check that there is not already a password. |
| 132 | OSStatus status = SecItemCopyMatching(query, NULL); |
| 133 | if (status == errSecItemNotFound) { |
| 134 | // A new entry must be created. |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 135 | base::ScopedCFTypeRef<CFDictionaryRef> keychain_data( |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 136 | CreateKeychainData(serviceNameLength, |
| 137 | serviceName, |
| 138 | accountNameLength, |
| 139 | accountName, |
| 140 | passwordLength, |
| 141 | passwordData, |
| 142 | kKeychainActionCreate)); |
| 143 | status = SecItemAdd(keychain_data, NULL); |
| 144 | } else if (status == noErr) { |
| 145 | // The entry must be updated. |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 146 | base::ScopedCFTypeRef<CFDictionaryRef> keychain_data( |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 147 | CreateKeychainData(serviceNameLength, |
| 148 | serviceName, |
| 149 | accountNameLength, |
| 150 | accountName, |
| 151 | passwordLength, |
| 152 | passwordData, |
| 153 | kKeychainActionUpdate)); |
| 154 | status = SecItemUpdate(query, keychain_data); |
| 155 | } |
| 156 | |
| 157 | return status; |
| 158 | } |
| 159 | |
| 160 | OSStatus AppleKeychain::FindGenericPassword(CFTypeRef keychainOrArray, |
| 161 | UInt32 serviceNameLength, |
| 162 | const char* serviceName, |
| 163 | UInt32 accountNameLength, |
| 164 | const char* accountName, |
| 165 | UInt32* passwordLength, |
| 166 | void** passwordData, |
| 167 | SecKeychainItemRef* itemRef) const { |
| 168 | DCHECK((passwordData && passwordLength) || |
| 169 | (!passwordData && !passwordLength)); |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 170 | base::ScopedCFTypeRef<CFDictionaryRef> query(CreateGenericPasswordQuery( |
| 171 | serviceNameLength, serviceName, accountNameLength, accountName)); |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 172 | |
| 173 | // Get the keychain item containing the password. |
| 174 | CFTypeRef resultRef = NULL; |
| 175 | OSStatus status = SecItemCopyMatching(query, &resultRef); |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 176 | base::ScopedCFTypeRef<CFTypeRef> result(resultRef); |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 177 | |
| 178 | if (status != noErr) { |
| 179 | if (passwordData) { |
| 180 | *passwordData = NULL; |
| 181 | *passwordLength = 0; |
| 182 | } |
| 183 | return status; |
| 184 | } |
| 185 | |
| 186 | if (passwordData) { |
| 187 | CFDataRef data = base::mac::CFCast<CFDataRef>(result); |
| 188 | NSUInteger length = CFDataGetLength(data); |
| 189 | *passwordData = malloc(length * sizeof(UInt8)); |
| 190 | CFDataGetBytes(data, CFRangeMake(0, length), (UInt8*)*passwordData); |
| 191 | *passwordLength = length; |
| 192 | } |
| 193 | return status; |
| 194 | } |
| 195 | |
| 196 | } // namespace crypto |