Last active
January 4, 2016 07:09
-
-
Save cvanderschuere/8586618 to your computer and use it in GitHub Desktop.
How to use the keychain for username/password
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| //How to save a password for a specific username | |
| -(void) saveUsername:(NSString*)user withPassword:(NSString*)pass forServer:(NSString*)server { | |
| NSError *error = nil; | |
| [SFHFKeychainUtils storeUsername:user andPassword:pass forServiceName:@"com.tally" updateExisting:YES error:&error]; | |
| if (error) { | |
| NSLog(@"Save error: %@",error.localizedDescription); | |
| } | |
| } | |
| //How to get a saved password | |
| NSString *password = [SFHFKeychainUtils getPasswordForUsername:savedUser.userID andServiceName:@"com.tally" error:&error]; | |
| // | |
| // SFHFKeychainUtils.h | |
| // | |
| // Created by Buzz Andersen on 10/20/08. | |
| // Based partly on code by Jonathan Wight, Jon Crosby, and Mike Malone. | |
| // Copyright 2008 Sci-Fi Hi-Fi. All rights reserved. | |
| // | |
| // Permission is hereby granted, free of charge, to any person | |
| // obtaining a copy of this software and associated documentation | |
| // files (the "Software"), to deal in the Software without | |
| // restriction, including without limitation the rights to use, | |
| // copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| // copies of the Software, and to permit persons to whom the | |
| // Software is furnished to do so, subject to the following | |
| // conditions: | |
| // | |
| // The above copyright notice and this permission notice shall be | |
| // included in all copies or substantial portions of the Software. | |
| // | |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
| // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | |
| // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
| // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | |
| // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
| // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
| // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
| // OTHER DEALINGS IN THE SOFTWARE. | |
| // | |
| // Updated with ARC support. Originally forked from: | |
| // https://github.com/beelsebob/F1Pad/commit/66ea68e08eef0a66c706c45583e071f0a032f3c8 | |
| @interface SFHFKeychainUtils : NSObject | |
| + (NSString *) getPasswordForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error; | |
| + (BOOL) storeUsername: (NSString *) username andPassword: (NSString *) password forServiceName: (NSString *) serviceName updateExisting: (BOOL) updateExisting error: (NSError **) error; | |
| + (BOOL) deleteItemForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error; | |
| + (BOOL) purgeItemsForServiceName:(NSString *) serviceName error: (NSError **) error; | |
| @end | |
| // | |
| // SFHFKeychainUtils.m | |
| // | |
| // Created by Buzz Andersen on 10/20/08. | |
| // Based partly on code by Jonathan Wight, Jon Crosby, and Mike Malone. | |
| // Copyright 2008 Sci-Fi Hi-Fi. All rights reserved. | |
| // | |
| // Permission is hereby granted, free of charge, to any person | |
| // obtaining a copy of this software and associated documentation | |
| // files (the "Software"), to deal in the Software without | |
| // restriction, including without limitation the rights to use, | |
| // copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| // copies of the Software, and to permit persons to whom the | |
| // Software is furnished to do so, subject to the following | |
| // conditions: | |
| // | |
| // The above copyright notice and this permission notice shall be | |
| // included in all copies or substantial portions of the Software. | |
| // | |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
| // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | |
| // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
| // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | |
| // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
| // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
| // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
| // OTHER DEALINGS IN THE SOFTWARE. | |
| // | |
| #if ! __has_feature(objc_arc) | |
| #error This file must be compiled with ARC. | |
| #endif | |
| #import "SFHFKeychainUtils.h" | |
| #import <Security/Security.h> | |
| static NSString *SFHFKeychainUtilsErrorDomain = @"SFHFKeychainUtilsErrorDomain"; | |
| #if __IPHONE_OS_VERSION_MIN_REQUIRED < 30000 && TARGET_IPHONE_SIMULATOR | |
| @interface SFHFKeychainUtils (PrivateMethods) | |
| + (SecKeychainItemRef) getKeychainItemReferenceForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error; | |
| @end | |
| #endif | |
| @implementation SFHFKeychainUtils | |
| #if __IPHONE_OS_VERSION_MIN_REQUIRED < 30000 && TARGET_IPHONE_SIMULATOR | |
| + (NSString *) getPasswordForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error { | |
| if (!username || !serviceName) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil]; | |
| return nil; | |
| } | |
| SecKeychainItemRef item = [SFHFKeychainUtils getKeychainItemReferenceForUsername: username andServiceName: serviceName error: error]; | |
| if (*error || !item) { | |
| return nil; | |
| } | |
| // from Advanced Mac OS X Programming, ch. 16 | |
| UInt32 length; | |
| char *password; | |
| SecKeychainAttribute attributes[8]; | |
| SecKeychainAttributeList list; | |
| attributes[0].tag = kSecAccountItemAttr; | |
| attributes[1].tag = kSecDescriptionItemAttr; | |
| attributes[2].tag = kSecLabelItemAttr; | |
| attributes[3].tag = kSecModDateItemAttr; | |
| list.count = 4; | |
| list.attr = attributes; | |
| OSStatus status = SecKeychainItemCopyContent(item, NULL, &list, &length, (void **)&password); | |
| if (status != noErr) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil]; | |
| return nil; | |
| } | |
| NSString *passwordString = nil; | |
| if (password != NULL) { | |
| char passwordBuffer[1024]; | |
| if (length > 1023) { | |
| length = 1023; | |
| } | |
| strncpy(passwordBuffer, password, length); | |
| passwordBuffer[length] = '\0'; | |
| passwordString = [NSString stringWithCString:passwordBuffer]; | |
| } | |
| SecKeychainItemFreeContent(&list, password); | |
| CFRelease(item); | |
| return passwordString; | |
| } | |
| + (void) storeUsername: (NSString *) username andPassword: (NSString *) password forServiceName: (NSString *) serviceName updateExisting: (BOOL) updateExisting error: (NSError **) error { | |
| if (!username || !password || !serviceName) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil]; | |
| return; | |
| } | |
| OSStatus status = noErr; | |
| SecKeychainItemRef item = [SFHFKeychainUtils getKeychainItemReferenceForUsername: username andServiceName: serviceName error: error]; | |
| if (*error && [*error code] != noErr) { | |
| return; | |
| } | |
| *error = nil; | |
| if (item) { | |
| status = SecKeychainItemModifyAttributesAndData(item, | |
| NULL, | |
| strlen([password UTF8String]), | |
| [password UTF8String]); | |
| CFRelease(item); | |
| } | |
| else { | |
| status = SecKeychainAddGenericPassword(NULL, | |
| strlen([serviceName UTF8String]), | |
| [serviceName UTF8String], | |
| strlen([username UTF8String]), | |
| [username UTF8String], | |
| strlen([password UTF8String]), | |
| [password UTF8String], | |
| NULL); | |
| } | |
| if (status != noErr) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil]; | |
| } | |
| } | |
| + (void) deleteItemForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error { | |
| if (!username || !serviceName) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: 2000 userInfo: nil]; | |
| return; | |
| } | |
| *error = nil; | |
| SecKeychainItemRef item = [SFHFKeychainUtils getKeychainItemReferenceForUsername: username andServiceName: serviceName error: error]; | |
| if (*error && [*error code] != noErr) { | |
| return; | |
| } | |
| OSStatus status; | |
| if (item) { | |
| status = SecKeychainItemDelete(item); | |
| CFRelease(item); | |
| } | |
| if (status != noErr) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil]; | |
| } | |
| } | |
| + (void) purgeItemsForServiceName:(NSString *) serviceName error: (NSError **) error { | |
| if (!serviceName) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: 2000 userInfo: nil]; | |
| return; | |
| } | |
| NSMutableDictionary *searchData = [NSMutableDictionary new]; | |
| [searchData setObject:(__bridge id)kSecClassGenericPassword forKey:(__bridge id)kSecClass]; | |
| [searchData setObject:serviceName forKey:(__bridge id)kSecAttrService]; | |
| OSStatus status = SecItemDelete((__bridge_retained CFDictionaryRef)searchData); | |
| if (error != nil && status != noErr) | |
| { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil]; | |
| } | |
| } | |
| + (SecKeychainItemRef) getKeychainItemReferenceForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error { | |
| if (!username || !serviceName) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil]; | |
| return nil; | |
| } | |
| *error = nil; | |
| SecKeychainItemRef item; | |
| OSStatus status = SecKeychainFindGenericPassword(NULL, | |
| strlen([serviceName UTF8String]), | |
| [serviceName UTF8String], | |
| strlen([username UTF8String]), | |
| [username UTF8String], | |
| NULL, | |
| NULL, | |
| &item); | |
| if (status != noErr) { | |
| if (status != errSecItemNotFound) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil]; | |
| } | |
| return nil; | |
| } | |
| return item; | |
| } | |
| #else | |
| + (NSString *) getPasswordForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error { | |
| if (!username || !serviceName) { | |
| if (error != nil) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil]; | |
| } | |
| return nil; | |
| } | |
| if (error != nil) { | |
| *error = nil; | |
| } | |
| // Set up a query dictionary with the base query attributes: item type (generic), username, and service | |
| NSArray *keys = [[NSArray alloc] initWithObjects: (__bridge_transfer NSString *) kSecClass, kSecAttrAccount, kSecAttrService, nil]; | |
| NSArray *objects = [[NSArray alloc] initWithObjects: (__bridge_transfer NSString *) kSecClassGenericPassword, username, serviceName, nil]; | |
| NSMutableDictionary *query = [[NSMutableDictionary alloc] initWithObjects: objects forKeys: keys]; | |
| // First do a query for attributes, in case we already have a Keychain item with no password data set. | |
| // One likely way such an incorrect item could have come about is due to the previous (incorrect) | |
| // version of this code (which set the password as a generic attribute instead of password data). | |
| NSMutableDictionary *attributeQuery = [query mutableCopy]; | |
| [attributeQuery setObject: (id) kCFBooleanTrue forKey:(__bridge_transfer id) kSecReturnAttributes]; | |
| CFTypeRef attrResult = NULL; | |
| OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef) attributeQuery, &attrResult); | |
| //NSDictionary *attributeResult = (__bridge_transfer NSDictionary *)attrResult; | |
| if (status != noErr) { | |
| // No existing item found--simply return nil for the password | |
| if (error != nil && status != errSecItemNotFound) { | |
| //Only return an error if a real exception happened--not simply for "not found." | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil]; | |
| } | |
| return nil; | |
| } | |
| // We have an existing item, now query for the password data associated with it. | |
| NSMutableDictionary *passwordQuery = [query mutableCopy]; | |
| [passwordQuery setObject: (id) kCFBooleanTrue forKey: (__bridge_transfer id) kSecReturnData]; | |
| CFTypeRef resData = NULL; | |
| status = SecItemCopyMatching((__bridge CFDictionaryRef) passwordQuery, (CFTypeRef *) &resData); | |
| NSData *resultData = (__bridge_transfer NSData *)resData; | |
| if (status != noErr) { | |
| if (status == errSecItemNotFound) { | |
| // We found attributes for the item previously, but no password now, so return a special error. | |
| // Users of this API will probably want to detect this error and prompt the user to | |
| // re-enter their credentials. When you attempt to store the re-entered credentials | |
| // using storeUsername:andPassword:forServiceName:updateExisting:error | |
| // the old, incorrect entry will be deleted and a new one with a properly encrypted | |
| // password will be added. | |
| if (error != nil) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -1999 userInfo: nil]; | |
| } | |
| } | |
| else { | |
| // Something else went wrong. Simply return the normal Keychain API error code. | |
| if (error != nil) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil]; | |
| } | |
| } | |
| return nil; | |
| } | |
| NSString *password = nil; | |
| if (resultData) { | |
| password = [[NSString alloc] initWithData: resultData encoding: NSUTF8StringEncoding]; | |
| } | |
| else { | |
| // There is an existing item, but we weren't able to get password data for it for some reason, | |
| // Possibly as a result of an item being incorrectly entered by the previous code. | |
| // Set the -1999 error so the code above us can prompt the user again. | |
| if (error != nil) { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -1999 userInfo: nil]; | |
| } | |
| } | |
| return password; | |
| } | |
| + (BOOL) storeUsername: (NSString *) username andPassword: (NSString *) password forServiceName: (NSString *) serviceName updateExisting: (BOOL) updateExisting error: (NSError **) error | |
| { | |
| if (!username || !password || !serviceName) | |
| { | |
| if (error != nil) | |
| { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil]; | |
| } | |
| return NO; | |
| } | |
| // See if we already have a password entered for these credentials. | |
| NSError *getError = nil; | |
| NSString *existingPassword = [SFHFKeychainUtils getPasswordForUsername: username andServiceName: serviceName error:&getError]; | |
| if ([getError code] == -1999) | |
| { | |
| // There is an existing entry without a password properly stored (possibly as a result of the previous incorrect version of this code. | |
| // Delete the existing item before moving on entering a correct one. | |
| getError = nil; | |
| [self deleteItemForUsername: username andServiceName: serviceName error: &getError]; | |
| if ([getError code] != noErr) | |
| { | |
| if (error != nil) | |
| { | |
| *error = getError; | |
| } | |
| return NO; | |
| } | |
| } | |
| else if ([getError code] != noErr) | |
| { | |
| if (error != nil) | |
| { | |
| *error = getError; | |
| } | |
| return NO; | |
| } | |
| if (error != nil) | |
| { | |
| *error = nil; | |
| } | |
| OSStatus status = noErr; | |
| if (existingPassword) | |
| { | |
| // We have an existing, properly entered item with a password. | |
| // Update the existing item. | |
| if (![existingPassword isEqualToString:password] && updateExisting) | |
| { | |
| //Only update if we're allowed to update existing. If not, simply do nothing. | |
| NSArray *keys = [[NSArray alloc] initWithObjects: (__bridge_transfer NSString *) kSecClass, | |
| kSecAttrService, | |
| kSecAttrLabel, | |
| kSecAttrAccount, | |
| nil]; | |
| NSArray *objects = [[NSArray alloc] initWithObjects: (__bridge_transfer NSString *) kSecClassGenericPassword, | |
| serviceName, | |
| serviceName, | |
| username, | |
| nil]; | |
| NSDictionary *query = [[NSDictionary alloc] initWithObjects: objects forKeys: keys]; | |
| status = SecItemUpdate((__bridge_retained CFDictionaryRef) query, (__bridge_retained CFDictionaryRef) [NSDictionary dictionaryWithObject: [password dataUsingEncoding: NSUTF8StringEncoding] forKey: (__bridge_transfer NSString *) kSecValueData]); | |
| } | |
| } | |
| else | |
| { | |
| // No existing entry (or an existing, improperly entered, and therefore now | |
| // deleted, entry). Create a new entry. | |
| NSArray *keys = [[NSArray alloc] initWithObjects: (__bridge_transfer NSString *) kSecClass, | |
| kSecAttrService, | |
| kSecAttrLabel, | |
| kSecAttrAccount, | |
| kSecValueData, | |
| nil]; | |
| NSArray *objects = [[NSArray alloc] initWithObjects: (__bridge_transfer NSString *) kSecClassGenericPassword, | |
| serviceName, | |
| serviceName, | |
| username, | |
| [password dataUsingEncoding: NSUTF8StringEncoding], | |
| nil]; | |
| NSDictionary *query = [[NSDictionary alloc] initWithObjects: objects forKeys: keys]; | |
| status = SecItemAdd((__bridge_retained CFDictionaryRef) query, NULL); | |
| } | |
| if (error != nil && status != noErr) | |
| { | |
| // Something went wrong with adding the new item. Return the Keychain error code. | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil]; | |
| return NO; | |
| } | |
| return YES; | |
| } | |
| + (BOOL) deleteItemForUsername: (NSString *) username andServiceName: (NSString *) serviceName error: (NSError **) error | |
| { | |
| if (!username || !serviceName) | |
| { | |
| if (error != nil) | |
| { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil]; | |
| } | |
| return NO; | |
| } | |
| if (error != nil) | |
| { | |
| *error = nil; | |
| } | |
| NSArray *keys = [[NSArray alloc] initWithObjects: (__bridge_transfer NSString *) kSecClass, kSecAttrAccount, kSecAttrService, kSecReturnAttributes, nil]; | |
| NSArray *objects = [[NSArray alloc] initWithObjects: (__bridge_transfer NSString *) kSecClassGenericPassword, username, serviceName, kCFBooleanTrue, nil]; | |
| NSDictionary *query = [[NSDictionary alloc] initWithObjects: objects forKeys: keys]; | |
| OSStatus status = SecItemDelete((__bridge CFDictionaryRef) query); | |
| if (error != nil && status != noErr) | |
| { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil]; | |
| return NO; | |
| } | |
| return YES; | |
| } | |
| + (BOOL) purgeItemsForServiceName:(NSString *) serviceName error: (NSError **) error { | |
| if (!serviceName) | |
| { | |
| if (error != nil) | |
| { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: -2000 userInfo: nil]; | |
| } | |
| return NO; | |
| } | |
| if (error != nil) | |
| { | |
| *error = nil; | |
| } | |
| NSMutableDictionary *searchData = [NSMutableDictionary new]; | |
| [searchData setObject:(__bridge id)kSecClassGenericPassword forKey:(__bridge id)kSecClass]; | |
| [searchData setObject:serviceName forKey:(__bridge id)kSecAttrService]; | |
| OSStatus status = SecItemDelete((__bridge CFDictionaryRef)searchData); | |
| if (error != nil && status != noErr) | |
| { | |
| *error = [NSError errorWithDomain: SFHFKeychainUtilsErrorDomain code: status userInfo: nil]; | |
| return NO; | |
| } | |
| return YES; | |
| } | |
| #endif | |
| @end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment