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Reputation: 18411

Validate SSH connectivity using SSH-keys

I have connected two servers using SSH key exchange. Now I am able to login into remote server without password.

Now , I want to validate if connection is really working without password .How can I do that ?

I tried following approach where SSH should timeout after 10 seconds, I will capture its Return code. but it never does. Once it timeout. It remain on the password prompt. 

ssh -o ServerAliveInterval=10 -o ConnectTimeout=15 user@ip.ip.ip.ip exit

if [ "$?" -ne 0 ];then
  echo "SSH keys no more working,you need to initiate keys exchange again!!"
  exit 1;
fi

Case-I

However,when SSH keys are not working then and it never time-out and remain on password prompt. So cannot capture return code.

ssh -o ServerAliveInterval=10 -o ConnectTimeout=15 user@ip.ip.ip.ip exit
Enter Windows password:

case-II

When I provide IP address which is not pingable then this approch works.

ssh -o ServerAliveInterval=10 -o ConnectTimeout=15 user@ip1.ip1.ip1.ip1 exit   
ssh: connect to host ip1.ip1.ip1.ip1 port 22: Connection timed out

Need help in determining if SSH connection is password-less working or not.

Upvotes: 1

Views: 771

Answers (1)

Jakuje
Jakuje

Reputation: 26006

You can disable password authentication using PasswordAuthentication=no. It will fail immediately, when the pubkey authentication fail.

ssh -o BatchMode=yes -o ConnectTimeout=15 user@ip.ip.ip.ip exit

Edit: Using BatchMode should certainly work.

Upvotes: 1

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