sg_rule_example.py

from troposphere import Template
from troposphere.ec2 import (
    SecurityGroup,
    SecurityGroupIngress,
)

t = Template()


sg1 = t.add_resource(
    SecurityGroup(
        "SecurityGroup1",
        GroupDescription="Security Group 1",
    )
)

sg2 = t.add_resource(
    SecurityGroup(
        "SecurityGroup2",
        GroupDescription="Security Group 2",
    )
)

rule = t.add_resource(
    SecurityGroupIngress(
        "AllowSSHFromGroup1ToGroup2",
        FromPort=22,
        ToPort=22,
        IpProtocol="tcp",
        GroupId=sg2.Ref(),
        SourceSecurityGroupId=sg1.Ref(),
    )
)

print t.to_json()