How to pass the password to su/sudo/ssh without ov

Question

I'm writing a C Shell program that will be doing su or sudo or ssh. They all want their passwords in console input (the TTY) rather than stdin or the command line.

Does anybody know a solution?

Setting up password-less sudo is not an option.

expect could be an option, but it's not present on my stripped-down system.

Answer 1

The usual solution to this problem is setuiding a helper app that performs the task requiring superuser access: http://en.wikipedia.org/wiki/Setuid

Sudo is not meant to be used offline.

Later edit: SSH can be used with private-public key authentication. If the private key does not have a passphrase, ssh can be used without prompting for a password.

Answer 2

Building on @Jahid's answer, this worked for me on macOS 10.13:

ssh <remote_username>@<remote_server> sudo -S <<< <remote_password> cat /etc/sudoers