How to handle ssh key?

Question

system("ssh test.host.com");

its asking for permentaly add key or not ?

I want automatically it should say yes !

Answer 1

The fact that ssh asks if you want to connect even if the host's public key isn't checked yet is the result of having StrictHostKeyChecking ask (or yes) in your /etc/ssh/ssh_config or ~/.ssh/config. You can set it to no if you want to automatically add unknown host keys to your known_hosts file. If you don't want to make this a permanent configuration change, you can also use it on the command line:

system("ssh -o StrictHostKeyChecking=no test.host.com");

In either case, ssh will issue a warning on host key mismatches an will disable password authentication because of possible man-in-the-middle attacks. You can still login with public-key authentication.