`Auth.KeychainError(code=itemNotFound)` on MacOS with SDK v2.16

[rebryk]

Bug report

• [+] I confirm this is a bug with Supabase, not with my own application.
• [+] I confirm I have searched the Docs, GitHub Discussions, and Discord.

Describe the bug

When i switched from supabase v2.0 to v2.16 try await supabaseClient.auth.session throws Auth.KeychainError(code=itemNotFound) on MacOS.

To Reproduce

1. Create a sign URL

try supabaseClient.auth.getOAuthSignInURL(
      provider: Provider.google,
      redirectTo: `app-schema://auth`
)

2. Open url

NSWorkspace.shared.open(url)

3. Handle deeplink after Google authorization

func application(_ application: NSApplication, open urls: [URL]) {
    if let url = urls.first, url.host == "auth" {
        Task {
            try await supabaseClient.auth.session(from: url)
        }
    }
}

4. Step 3 returns a valid session; however, try await supabaseClient.auth.session will throw an Auth.KeychainError(code=itemNotFound) error.

Expected behavior

I expect try await supabaseClient.auth.session to restore the session from the keychain as it did before in previous SDK versions.

System information

• OS: macOS
• Browser (if applies) Arc Browser
• Version of supabase: v2.16

[grdsdev]

Hi @rebryk try attaching a logger on Supabase initialization, and let me know if you see any other log being fired, this is how you can do it.

let supabase = SupabaseClient(
  supabaseURL: URL(string: "URL")!,
  supabaseKey: "API_KEY",
  options: .init(
    global: .init(logger: AppLogger())
  )
)

struct AppLogger: SupabaseLogger {
  let logger = Logger(subsystem: Bundle.main.bundleIdentifier!, category: "supabase")

  func log(message: SupabaseLogMessage) {
    switch message.level {
    case .verbose:
      logger.log(level: .info, "\(message.description)")
    case .debug:
      logger.log(level: .debug, "\(message.description)")
    case .warning, .error:
      logger.log(level: .error, "\(message.description)")
    }
  }
}

[rebryk]

@grdsdev

2024-08-28T08:55:35-0700 info supabase : [n/a] 2024-08-28T15:55:35Z [verbose] [Helpers] [Helpers/LoggerInterceptor.intercept(_:next:):23] Request: POST https://<URL>/auth/v1/token
2024-08-28T08:55:35-0700 info supabase : [n/a] 2024-08-28T15:55:35Z [verbose] [Helpers] [Helpers/LoggerInterceptor.intercept(_:next:):33] Response: Status code: 200 Content-Length: 3413
2024-08-28T08:55:35-0700 error supabase : [n/a] 2024-08-28T15:55:35Z [error] [Auth] [Auth/SessionManager.update(_:):103] Failed to store session: Unspecified Keychain error: -34018.
2024-08-28T08:55:35-0700 debug supabase : [n/a] 2024-08-28T15:55:35Z [debug] [Auth] [Auth/SessionManager.session():41] begin
2024-08-28T08:55:35-0700 debug supabase : [n/a] 2024-08-28T15:55:35Z [debug] [Auth] [Auth/SessionManager.session():41] error: errSecItemNotFound: The item cannot be found.
2024-08-28T08:55:35-0700 debug supabase : [n/a] 2024-08-28T15:55:35Z [debug] [Auth] [Auth/SessionManager.session():41] end

[grdsdev]

The key is Failed to store session: Unspecified Keychain error: -34018. That error is errSecMissingEntitlement, it means there is something wrong with the added entitlement, can you check this https://developer.apple.com/documentation/security/errsecmissingentitlement and verify if your project is correctly configured?

I'll also check on my side, if there is anything wrong, since you mentioned it stoped working.

[rebryk]

As far as I understand, macOS apps have default access to a private Keychain for storing app-specific data (you do not need to add any entitlements, i don't use keychain sharing). Also, everything works with previous versions of the SDK.

@grdsdev so it is most likely an issue with the new version

Let me know if i can help

[grdsdev]

It seems it started after this #455

[rebryk]

you are right: 2.14 works, and 2.14.1 does not

[grdsdev]

Doing a few tests and if you add the keychain sharing capability to your app, even if you don't assign any access group, it works, will try to find on docs why that happens.

[rebryk]

Yeah, when I add the keychain sharing capability, the app works. Hopefully it will not break anythings else

[rebryk]

I have an issue when I run a signed release with empty keychain sharing capability:
app.getfluently.Fluently: Unsatisfied entitlements: keychain-access-groups

[rebryk]

Same thing when I add:

<key>keychain-access-groups</key>
<array>
    <string>$(AppIdentifierPrefix)app.getfluently.Fluently</string>
</array>

[grdsdev]

@rebryk if you add an access group, then you need to provide a custom KeychainLocalStorage implementation with the access group.

[rebryk]

@grdsdev do you have an off-the-shelf implementation? i just want to use supabase in a way I used it before

[grdsdev]

You can use the following code, once I merge this #519

KeychainLocalStorage is the default implementation used internally, and it is exposed so you can customize it.

let supabase = SupabaseClient(
  supabaseURL: URL(string: "https://project-id.supabase.com")!,
  supabaseKey: "supabase-anon-key",
  options: .init(
    auth: .init(
      localStorage: KeychainLocalStorage(
        accessGroup: "<# Your Team ID #>.app.getfluently.Fluently"
      )
    )
  )
)