[PM-26420] Add flight recorder logs for vault unlock method and PIN migration

app/src/main/kotlin/com/x8bit/bitwarden/data/auth/manager/KdfManagerImpl.kt

@@ -16,6 +16,7 @@ import com.x8bit.bitwarden.data.auth.repository.util.toUserStateJsonKdfUpdatedMi
 import com.x8bit.bitwarden.data.auth.util.KdfParamsConstants.DEFAULT_PBKDF2_ITERATIONS
 import com.x8bit.bitwarden.data.platform.manager.FeatureFlagManager
 import com.x8bit.bitwarden.data.vault.datasource.sdk.VaultSdkSource
+import timber.log.Timber
 import kotlin.collections.get
 
 /**
@@ -71,6 +72,7 @@ class KdfManagerImpl(
                 onSuccess = {
                     authDiskSource.userState = authDiskSource.userState
                         ?.toUserStateJsonKdfUpdatedMinimums()
+                    Timber.d("[Auth] Upgraded user's KDF to minimums")
                     UpdateKdfMinimumsResult.Success
                 },
                 onFailure = { UpdateKdfMinimumsResult.Error(error = it) },

app/src/main/kotlin/com/x8bit/bitwarden/data/vault/manager/VaultLockManagerImpl.kt

@@ -39,6 +39,7 @@ import com.x8bit.bitwarden.data.vault.datasource.sdk.model.InitializeCryptoResul
 import com.x8bit.bitwarden.data.vault.manager.model.VaultStateEvent
 import com.x8bit.bitwarden.data.vault.repository.model.VaultUnlockData
 import com.x8bit.bitwarden.data.vault.repository.model.VaultUnlockResult
+import com.x8bit.bitwarden.data.vault.repository.util.logTag
 import com.x8bit.bitwarden.data.vault.repository.util.statusFor
 import com.x8bit.bitwarden.data.vault.repository.util.toVaultUnlockResult
 import com.x8bit.bitwarden.data.vault.repository.util.update
@@ -239,7 +240,10 @@ class VaultLockManagerImpl(
                                         trustedDeviceManager
                                             .trustThisDeviceIfNecessary(userId = userId)
                                         updateKdfIfNeeded(initUserCryptoMethod)
-                                        migratePinProtectedUserKeyIfNeeded(userId = userId)
+                                        migratePinProtectedUserKeyIfNeeded(
+                                            userId = userId,
+                                            initUserCryptoMethod = initUserCryptoMethod,
+                                        )
                                         setVaultToUnlocked(userId = userId)
                                     } else {
                                         incrementInvalidUnlockCount(userId = userId)
@@ -284,12 +288,19 @@ class VaultLockManagerImpl(
      * Optionally marks the envelope as in-memory only if the PIN-protected user key is not present.
      *
      * @param userId The ID of the user for whom to migrate the PIN-protected user key.
+     * @param initUserCryptoMethod The method used to initialize the user's crypto.
      */
-    private suspend fun migratePinProtectedUserKeyIfNeeded(userId: String) {
+    private suspend fun migratePinProtectedUserKeyIfNeeded(
+        userId: String,
+        initUserCryptoMethod: InitUserCryptoMethod,
+    ) {
         val encryptedPin = authDiskSource.getEncryptedPin(userId) ?: return
         if (authDiskSource.getPinProtectedUserKeyEnvelope(userId) != null) return
 
         val inMemoryOnly = authDiskSource.getPinProtectedUserKey(userId) == null
+
+        Timber.d("[Auth] Vault unlocked, method: ${initUserCryptoMethod.logTag}")
+
         vaultSdkSource.enrollPinWithEncryptedPin(userId, encryptedPin)
             .onSuccess { enrollPinResponse ->
                 authDiskSource.storeEncryptedPin(
@@ -306,6 +317,11 @@ class VaultLockManagerImpl(
                     pinProtectedUserKey = null,
                     inMemoryOnly = inMemoryOnly,
                 )
+                if (inMemoryOnly) {
+                    Timber.d("[Auth] Set PIN-protected user key in memory")
+                } else {
+                    Timber.d("[Auth] Migrated from legacy PIN to PIN-protected user key envelope")
+                }
             }
     }
 

app/src/main/kotlin/com/x8bit/bitwarden/data/vault/repository/VaultRepositoryImpl.kt

@@ -40,6 +40,7 @@ import com.x8bit.bitwarden.data.vault.repository.model.GenerateTotpResult
 import com.x8bit.bitwarden.data.vault.repository.model.ImportCredentialsResult
 import com.x8bit.bitwarden.data.vault.repository.model.TotpCodeResult
 import com.x8bit.bitwarden.data.vault.repository.model.VaultUnlockResult
+import com.x8bit.bitwarden.data.vault.repository.util.logTag
 import com.x8bit.bitwarden.data.vault.repository.util.toEncryptedSdkCipher
 import com.x8bit.bitwarden.data.vault.repository.util.toEncryptedSdkFolder
 import com.x8bit.bitwarden.data.vault.repository.util.toSdkAccount
@@ -326,7 +327,12 @@ class VaultRepositoryImpl(
                         )
                         authDiskSource.storeUserBiometricInitVector(userId = userId, iv = cipher.iv)
                     }
-                    deriveTemporaryPinProtectedUserKeyIfNecessary(userId = userId)
+                    deriveTemporaryPinProtectedUserKeyIfNecessary(
+                        userId = userId,
+                        initUserCryptoMethod = InitUserCryptoMethod.DecryptedKey(
+                            decryptedUserKey = decryptedUserKey,
+                        ),
+                    )
                 }
             }
     }
@@ -350,7 +356,13 @@ class VaultRepositoryImpl(
             )
             .also {
                 if (it is VaultUnlockResult.Success) {
-                    deriveTemporaryPinProtectedUserKeyIfNecessary(userId = userId)
+                    deriveTemporaryPinProtectedUserKeyIfNecessary(
+                        userId = userId,
+                        initUserCryptoMethod = InitUserCryptoMethod.Password(
+                            password = masterPassword,
+                            userKey = userKey,
+                        ),
+                    )
                 }
             }
     }
@@ -516,14 +528,23 @@ class VaultRepositoryImpl(
      * unlocks during this current app session.
      *
      * If the user's vault has not yet been unlocked, this call will do nothing.
+     *
+     * @param userId The ID of the user to check.
+     * @param initUserCryptoMethod The method used to initialize the user's crypto.
      */
-    private suspend fun deriveTemporaryPinProtectedUserKeyIfNecessary(userId: String) {
+    private suspend fun deriveTemporaryPinProtectedUserKeyIfNecessary(
+        userId: String,
+        initUserCryptoMethod: InitUserCryptoMethod,
+    ) {
         val encryptedPin = authDiskSource.getEncryptedPin(userId = userId) ?: return
         val existingPinProtectedUserKeyEnvelope = authDiskSource
             .getPinProtectedUserKeyEnvelope(
                 userId = userId,
             )
         if (existingPinProtectedUserKeyEnvelope != null) return
+
+        Timber.d("[Auth] Vault unlocked, method: ${initUserCryptoMethod.logTag}")
+
         vaultSdkSource
             .enrollPinWithEncryptedPin(
                 userId = userId,
@@ -544,6 +565,7 @@ class VaultRepositoryImpl(
                     pinProtectedUserKey = null,
                     inMemoryOnly = true,
                 )
+                Timber.d("[Auth] Set PIN-protected user key in memory")
             }
     }
 

app/src/main/kotlin/com/x8bit/bitwarden/data/vault/repository/util/InitUserCryptoMethodExtensions.kt

@@ -0,0 +1,19 @@
+package com.x8bit.bitwarden.data.vault.repository.util
+
+import com.bitwarden.core.InitUserCryptoMethod
+
+/**
+ * Returns the label for the given [InitUserCryptoMethod].
+ * This will be only used for logging purposes, therefore it is not localized.
+ */
+val InitUserCryptoMethod.logTag: String
+    get() = when (this) {
+        is InitUserCryptoMethod.AuthRequest -> "Auth Request"
+        is InitUserCryptoMethod.DecryptedKey -> "Decrypted Key (Never Lock/Biometrics)"
+        is InitUserCryptoMethod.DeviceKey -> "Device Key"
+        is InitUserCryptoMethod.KeyConnector -> "Key Connector"
+        is InitUserCryptoMethod.Password -> "Password"
+        is InitUserCryptoMethod.Pin -> "Pin"
+        is InitUserCryptoMethod.PinEnvelope -> "Pin Envelope"
+        is InitUserCryptoMethod.MasterPasswordUnlock -> "Master Password Unlock"
+    }