How to tunnel pcf service from spring boot application - spring-boot

Question

I have a spring boot application deployed on pivotal cloud foundry.
I'm trying to tunnel (cf ssh) to that application in pcf from my spring boot application, but not able to find any api or client libraries to achieve it.
Actual cli command to tunnel pcf:
cf ssh -N -T -L 10001:localhost:10001 ms name
Any suggestions are welcome.

Answer 1

If you're trying to write Java code that would do the same thing as the cf ssh command, that should be possible. It's standard SSH, but with short-lived credentials so the trick will be generating credentials that you can use from your app.
Here's an example of using a standard SSH/SCP/SFTP client, note that ssh.bosh-lite.com will be your SSH domain, which you can see from cf curl /v2/info:
$ ssh -p 2222 cf:$(cf app app-name --guid)/0#ssh.bosh-lite.com
$ scp -P 2222 -oUser=cf:$(cf app app-name --guid)/0 my-local-file.json ssh.bosh-lite.com:my-remote-file.json
$ sftp -P 2222 cf:$(cf app app-name --guid)/0#ssh.bosh-lite.com
https://github.com/cloudfoundry/diego-ssh#cloud-foundry-via-cloud-controller-and-uaa
That said, you should be able to do something similar with any standard SSH Java library.
As mentioned above, the trick is in getting credentials. The username will be the format cf:application-guid/app-instance-number, which is easy, but the password needs to be generated with cf ssh-code, or the comparable call to the UAA API.
Ex: curl -vv -H 'Accept: application/json' -H "Authorization: $(cf oauth-token)" "https://uaa.run.pivotal.io/oauth/authorize?client_id=ssh-proxy&response_type=code"
This example uses curl to send the request and cf oauth-token to get a valid Oauth2 bearer token for the logged in user. You could get a valid bearer token in a number of ways, including making direct API calls or using the cf-java-client. It just needs to be a valid token for the user that should perform the SSH action (i.e. it would be the user that's running cf ssh).
Hope that helps!