tty permission issues

[Errol Casey]

I've run into an issue with tty permissions when using GNUpg.

We have accounts that users cannot login to directly for security reasons.

They must use sudo su - <account> to access the account, after logging in
from
their own personal account.

This leaves the pseudo tty owned by the login users. The permission issue
causes pinentry to fail, and not prompt for passphrases.

I'm looking into possible changes to sudo config, setuid binaries, and
individual script to change permission before and after sudo as possible
workarounds.

Wanted to see if other gnupg users had worked around this issue.
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