cloudtools/troposphere — pull request #134 by jstrunk (2014-10-05 18:11:42+00:00)
Title: Fix DBSecurityGroupIngress required props

http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-rds-security-group-ingress.html

You can use one of the following sets of properties:
1. CIDRIP
2. EC2-VPC: EC2SecurityGroupId
3. EC2-Classic: EC2SecurityGroupName AND EC2SecurityGroupOwnerId