Database auditing rentention period should be longer than 90 days

Explanation

When Auditing is configured for a SQL database, if the retention period is not set, the retention will be unlimited.

If the retention period is to be explicitly set, it should be set for no less than 90 days.

Possible Impact

Short logging retention could result in missing valuable historical information

Suggested Resolution

Set retention periods of database auditing to greater than 90 days

Insecure Example

The following example will fail the azure-database-retention-period-set check.

resource "azurerm_mssql_database_extended_auditing_policy" "bad_example" {
  database_id                             = azurerm_mssql_database.example.id
  storage_endpoint                        = azurerm_storage_account.example.primary_blob_endpoint
  storage_account_access_key              = azurerm_storage_account.example.primary_access_key
  storage_account_access_key_is_secondary = false
  retention_in_days                       = 6
}

Secure Example

The following example will pass the azure-database-retention-period-set check.

resource "azurerm_mssql_database_extended_auditing_policy" "good_example" {
  database_id                             = azurerm_mssql_database.example.id
  storage_endpoint                        = azurerm_storage_account.example.primary_blob_endpoint
  storage_account_access_key              = azurerm_storage_account.example.primary_access_key
  storage_account_access_key_is_secondary = false
}

resource "azurerm_mssql_database_extended_auditing_policy" "good_example" {
  database_id                             = azurerm_mssql_database.example.id
  storage_endpoint                        = azurerm_storage_account.example.primary_blob_endpoint
  storage_account_access_key              = azurerm_storage_account.example.primary_access_key
  storage_account_access_key_is_secondary = false
  retention_in_days                       = 90
}

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