[DBInstance] Add region validation for the attributes AutomaticBackup… #561
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…ReplicationRegion, SourceDBInstanceIdentifier and SourceDBClusterIdentifier
ccmlst
reviewed
Aug 7, 2024
| /** | ||
| * There are fields in the request (e.g. SourceDBInstanceIdentifier and SourceDBClusterIdentifier) that accept 2 types | ||
| * of identifiers: InstanceId or ARN. In the case of containing an ARN, we need to validate that the region is correct, | ||
| * as it will be used to contract the client endpoint, and a malformed region would lead to both security issues |
ccmlst
approved these changes
Aug 7, 2024
zrfr
reviewed
Aug 15, 2024
Comment on lines
+389
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+391
| Validations.validateSourceRegion(request.getDesiredResourceState().getAutomaticBackupReplicationRegion()); | ||
| assertValidRegionFromArnOrIdentifier(request.getDesiredResourceState().getSourceDBInstanceIdentifier()); | ||
| assertValidRegionFromArnOrIdentifier(request.getDesiredResourceState().getSourceDBClusterIdentifier()); |
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The error message "Unknown source region" could be misleading for these properties. We should have a different error message for this specific case.
zrfr
requested changes
Aug 26, 2024
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AWS::RDS::DBInstance takes an AWS region name as input without validation and passes it directly into the AWS Java SDK v2 client. This can be specified in the AutomaticBackupReplicationRegion, SourceDBInstanceIdentifier, SourceDBClusterIdentifier properties.
The consequence of not validating this field is both a possible security issue where you could try to hit user-specified URLs, and also when it fails, it gives back a non-friendly error response to the client, making it hard to troubleshoot.