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44 lines
1.2 KiB
Bash
44 lines
1.2 KiB
Bash
#!/bin/sh
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# For use with pam_exec.so
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#
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# auth optional pam_exec.so expose_authtok /usr/lib/systemd/systemd-user-pam-ssh
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#
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# Takes a password from STDIN, starts the ssh-agent as a systemd user service,
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# and decrypts the ssh key using the provided password, adding it to the agent.
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# Handle inital checks as root
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if [ $(id -u) = 0 ]
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then
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# Don't execute if the systemd --user instance isn't running
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systemctl -q is-active user@$(id -u ${PAM_USER}) || exit 0
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# Re-execute this script as the user to add their key (while piping STDIN)
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cat | exec su ${PAM_USER} -c "$0 initialize"
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# Handle adding the key as the user
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else
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# Add key
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if [ "$1" = "initialize" ]; then
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# We need to specify the XDG_RUNTIME_DIR because pam_systemd won't have run
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export XDG_RUNTIME_DIR=/run/user/$(id -u)
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# Get the SSH_AUTH_SOCK variable from the user session
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export $(systemctl --user show-environment | grep ^SSH_AUTH_SOCK=)
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# Ensure the ssh-agent service is started
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systemctl --user start ssh-agent
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# Newer ssh-add won't read passphrase from stdin but will pipe it to askpass
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export SSH_ASKPASS="$0"
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cat | ssh-add
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exit 0
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# Double as askpass
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else
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cat
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exit 0
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fi
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fi
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