iOS KeychainItemWrapper 未更新

问题描述

我刚刚发现我的应用程序存在一个有趣的问题.在应用程序中，我将用户的用户名和密码保存到钥匙串中.

I just found an interesting problem with my app. In the app I am saving the user's user name and password to the keychain.

keychainWrapper = [[KeychainItemWrapper alloc] initWithIdentifier:@"MyLoginPassword" accessGroup:nil];

[keychainWrapper setObject:usernameField.text forKey:(id)kSecAttrAccount];
[keychainWrapper setObject:passwordField.text forKey:(id)kSecValueData];

当这段代码在 Debug 中运行时，它似乎工作得很好.它每次都会更新，我以后可以从钥匙串中检索项目.当它在 Distribution 中运行时，钥匙串永远不会更新.我已经验证是的，这些代码行在两个版本中都被命中.我正在使用带有 iOS5 SDK 的 Xcode 4.2，并在安装了 iOS5 的 iPad 2 上运行该应用程序.

When this code is run in Debug it seems to work just fine. It updates each time and I can later retrieve the items from the keychain. When it is run in Distribution however the keychain never gets updated. I have verified that yes these lines of code are hit in both builds. I am using Xcode 4.2 with the iOS5 SDK and running the app on an iPad 2 with iOS5 installed.

推荐答案

我也遇到了这个问题，想了很久

I also had this problem, and it took me forever to figure out

有一个版本的KeychainWrapper"在 NSAssert 中浮动(除其他外).

There is a version of "KeychainWrapper" floating around that has it's SecItemUpdate within an NSAssert (among other things).

做这件事的人是个白痴！在为发布/分发而构建时，每个 NSAssert 都无效，这意味着代码甚至无法运行.

Whoever did this is a moron!, when building for release/distribution every NSAssert is nullified, meaning that code doesn't even get run.

例如:

NSAssert(SecItemUpdate((CFDictionaryRef)updateItem, (CFDictionaryRef)tempCheck), @"Couldn't update the Keychain Item." );

需要成为

OSStatus status = SecItemUpdate((CFDictionaryRef)updateItem, (CFDictionaryRef)tempCheck);
NSAssert(status == noErr, @"Couldn't update the Keychain Item." );

注意实际的 SecItemUpdate 是如何移动到 NSAssert 之外的，而是检查结果

Notice how the actual SecItemUpdate is moved outside the NSAssert, and instead the result is checked

重要提示:尝试更新 kSecValueData 的值，而不指定 kSecAttrAccount 的值，也会导致断言失败.因此，如果您的意图是存储单个敏感数据字符串(例如信用卡号码列表)，请务必在 kSecAttrAccount 属性中存储一些帐户名称"文本，如下所示:

Important note: Attempting to update a value for kSecValueData, without also specifying a value for kSecAttrAccount, will cause the assertion to fail as well. So, if your intent is to store a single string of sensitive data (such as a list of credit card numbers), be sure to store some "account name" text in the kSecAttrAccount attribute, like so:

static NSString* kCardListXML = @"cardListXML";
static NSString* cardListAccountName = @"cardListAccount";

-(void)setCardListXML:(NSString*)xml {
  KeychainItemWrapper* wrapper =
    [[KeychainItemWrapper alloc] initWithIdentifier:kCardListXML accessGroup:nil];
  [wrapper setObject:cardListAccountName forKey:(id)CFBridgingRelease(kSecAttrAccount)];
  [wrapper setObject:xml forKey:(id)CFBridgingRelease(kSecValueData)];
}    

-(NSString*)getCardListXML {
  KeychainItemWrapper* wrapper =
    [[KeychainItemWrapper alloc] initWithIdentifier:kCardListXML accessGroup:nil];
  [wrapper setObject:cardListAccountName forKey:(id)CFBridgingRelease(kSecAttrAccount)];
  return [wrapper objectForKey:CFBridgingRelease(kSecValueData)];
}

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