Multi hop SSH tunnel

There is a private API endpoint listening to port 9999 accessible from EC2 in a private subnet on AWS. Private subnet is accessible from a bastion host which is in a Public subnet and has a Public IP. Both hosts have different keipairs.

The task is to enable developers call API endpoint from their workstations.

Open local port forwarding:

ssh -vtA -i ec2.pem  -L9999:apiendpointIP:9999 ubuntu@ec2IP \
 -o 'ProxyCommand = ssh -vtA -i bastionhost.pem -L9999:localhost:9999 \
 ubuntu@bastionhostIP -W ec2IP:22'

Now developers can access the API endpoint:

localhost:9999

The next step is to create a limited user and chroot it to jail.

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