83 lines
3.2 KiB
Fish
83 lines
3.2 KiB
Fish
# See: https://aws.amazon.com/about-aws/whats-new/2022/05/aws-systems-manager-support-port-forwarding-remote-hosts-using-session-manager/
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# And: https://docs.aws.amazon.com/systems-manager/latest/userguide/session-manager-working-with-sessions-start.html#sessions-remote-port-forwarding
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function ssm_tunnel --description 'Access private AWS ressources via native SSM port forwarding through bastion'
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if test (count $argv) -lt 2
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echo "Provide an Host:Port Mapping & an Local Port"
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return
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end
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if [ "$env" != "ops" ]
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echo "Switch to OPS ENV first"
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return
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end
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# Get bastion host ID using it's name
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set INSTANCE_ID (aws ec2 describe-instances \
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--filter 'Name=tag:Name,Values=INSTANCE_NAME_HERE'\
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--query "Reservations[].Instances[?State.Name == 'running'].InstanceId[]"\
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--output text)
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# AWS Remote host i.e internal.s.twaice / dualstack.internal-stg-s-inter-9ov8h1o4saoa-793915940.eu-west-1.elb.amazonaws.com
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set REMOTE_HOST (string split -f1 : $argv[1])
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set REMOTE_PORT (string split -f2 : $argv[1])
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# Local port to bind for forwarding
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set LOCAL_PORT $argv[2]
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# Seconds until forwarding session times out (6h max)
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set TIMEOUT 21600
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# Start tunnel session
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echo "Starting Tunnel"
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aws ssm start-session --target $INSTANCE_ID \
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--document-name "AWS-StartPortForwardingSessionToRemoteHost" \
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--parameters "host=[$REMOTE_HOST],portNumber=[$REMOTE_PORT],localPortNumber=[$LOCAL_PORT]"
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echo "Tunneling Session Exited."
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end
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# This function is for Platform Admin / Infrastructure users only.
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# @TODO: It still utilized the old style of ssm tunneling -> needs c&p of new style as well
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function ssm_tunnel_admin --description 'access private AWS ressources via Bastion Host'
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if test (count $argv) -lt 2
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echo "Provide an Host:Port Mapping & an Local Port"
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return
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end
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if [ "$env" != "ops" ]
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echo "Switch to OPS ENV first"
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return
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end
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# Get bastion host ID using it's name
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set INSTANCE_ID (aws ec2 describe-instances \
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--filter 'Name=tag:Name,Values=INSTANCE_NAME_HERE'\
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--query "Reservations[].Instances[?State.Name == 'running'].InstanceId[]"\
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--output text)
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# AWS Remote host i.e elastic.aws.com:80
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set REMOTE_HOST $argv[1]
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# Ports to bind for forwarding
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set LOCAL_PORT $argv[2]
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set REM_PORT (math (random) % 65535 + 2000)
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set TIMEOUT 21600 #seconds until forwarding session times out (48h max)
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# make sure jq is installed
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# Start socat on the remote server
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set CMD "'sudo socat TCP4-LISTEN:$REM_PORT,reuseaddr,fork TCP4:$REMOTE_HOST'"
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set CMD_INVOC_ID (aws ssm send-command --instance-ids $INSTANCE_ID \
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--document-name 'AWS-RunShellScript' \
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--parameters "commands=$CMD,executionTimeout=$TIMEOUT" --output json | jq -r '.Command.CommandId')
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# Start tunnel session
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echo "Starting Tunnel"
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aws ssm start-session --target $INSTANCE_ID \
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--document-name "AWS-StartPortForwardingSession" \
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--parameters "portNumber=$REM_PORT,localPortNumber=$LOCAL_PORT"
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# stop socat on the bastion
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aws ssm cancel-command --command-id $CMD_INVOC_ID
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echo "Command Cancelled Successfully."
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end |