Does React Native Keychain use iOS Keychain and Android Keystore under the hood?

[msalamacallsign]

I am using the React Native Keychain library in my project and I would like to understand more about its implementation. Specifically, I would like to know if this library uses the native iOS Keychain and Android Keystore for storing credentials securely.

[iamaldi]

Hi @msalamacallsign ,

Even though you can, it is not recommended to store username-password credentials in your application's KeyStore/KeyChain.

To your original question, short answer is yes.

On Android, react-native-keychain implements KeychainModule^2. On iOS, it implements RNKeychainManager^3

Couple of notes on Android:

Note 1 - there are configurations where you can use react-native-keychain with less secure options^1. This could apply to scenarios where you're targeting older devices running older versions of Android for example, where hardware security features might not be available.

Note 2 - use of the "AES" Keychain.STORAGE_TYPE creates a KeyStore key entry that does not require user authentication (e.g., through PIN, passcode or biometrics). As a result, the symmetric key (used to encrypt and decrypt your application's data) can be used without user authentication.

This limitation is also mentioned in the package's README^4, however this may not be entirely clear to developers. Existing documentation could use some help to clear this up, which may be a future task for me I guess :).

[irby]

Hi @iamaldi can you clarify a little more about "it is not recommended to store user credentials in your application's KeyStore"?

For example, on iOS, since react-native-keychain implements RNKeychainManager, is it not storing passwords using Keychain? If this is the case, why is it not recommended to store using your application's key store?

[msalamacallsign]

@iamaldi Thanks a lot for your answer.

[msalamacallsign]

Hi @iamaldi

Currently, I am experiencing an issue where the KeyStore/Keychain gets cleared or corrupted on some user devices, and I am unsure why this is happening. I suspect there might be a conflict between a native SDK that we are integrating, which uses the Android KeyStore, and our app's React Native implementation, which uses the react-native-keychain that depends on the OS's KeyStore/Keychain.

I have two clarification questions:

1. Does react-native-keychain use the bundle/App ID as the key alias in some way?
2. Does react-native-keychain have a function to clear or reset the Android KeyStore or iOS Keychain?

[iamaldi]

Hi @iamaldi can you clarify a little more about "it is not recommended to store user credentials in your application's KeyStore"?

I have rephrased my original comment to note that I meant username-password credentials. Unless you have some specific use-case for storing a user's password, depending on your implementation: you can instead store the user's OAuth JWT access/refresh tokens or session identifiers .

For example, on iOS, since react-native-keychain implements RNKeychainManager, is it not storing passwords using Keychain? If this is the case, why is it not recommended to store using your application's key store?

On iOS, application data stored with react-native-keychain's RNKeychainManager, will be stored using Keychain.

Let me know if this clear enough.

[iamaldi]

Hi @iamaldi

Currently, I am experiencing an issue where the KeyStore/Keychain gets cleared or corrupted on some user devices, and I am unsure why this is happening. I suspect there might be a conflict between a native SDK that we are integrating, which uses the Android KeyStore, and our app's React Native implementation, which uses the react-native-keychain that depends on the OS's KeyStore/Keychain.

I have two clarification questions:

1. Does react-native-keychain use the bundle/App ID as the key alias in some way?

2. Does react-native-keychain have a function to clear or reset the Android KeyStore or iOS Keychain?

Can you open a new issue with this topic, and add some more details if possible?

[irby]

@iamaldi Is there a difference between your "application's keychain" versus the device's keychain iOS? If you are using react-native-keychain, which one are you using? My assumption is that react-native-keychain acts as the former, when you use this library it uses the application's keychain to store the value and not the device's keychain.

[MFrat]

@iamaldi Could you elaborate why is not recommended to store credentials in keychain and also list some references?

Apple docs says it is completely safe, also in Android. https://developer.apple.com/documentation/security/keychain_services

OWASP also recommends using Keychain for such scenarios: https://mas.owasp.org/MASTG/iOS/0x06d-Testing-Data-Storage/#backups

[DorianMazur]

Yes, on iOS we use Keychain and on Android we use Jetpack DataStore + Android Keystore. Facebook Conceal is deprecated and will be removed in the next major release.