54 lines
2.0 KiB
Bash
Executable File
54 lines
2.0 KiB
Bash
Executable File
#!/bin/sh
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# Creates the kiosk account the whole image is built around.
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#
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# live-build runs chroot_local-includes BEFORE chroot_local-hooks, so
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# /etc/thinclient-agent/config.env (written by build-thin-client-iso.sh) already
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# exists here. Sourcing it is why hooks don't need placeholder/sed templating.
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set -eu
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. /etc/thinclient-agent/config.env
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if ! id "$KIOSK_USERNAME" >/dev/null 2>&1; then
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useradd --create-home --shell /bin/bash --comment "Thin client kiosk session" "$KIOSK_USERNAME"
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fi
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for grp in audio video input render dialout netdev plugdev seat _seatd; do
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if getent group "$grp" >/dev/null 2>&1; then
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adduser "$KIOSK_USERNAME" "$grp" >/dev/null
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fi
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done
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# No password is baked in: the account is locked so it can never be used to log in
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# remotely, while the physical console still autologins via greetd.
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passwd --lock "$KIOSK_USERNAME" >/dev/null
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adduser "$KIOSK_USERNAME" sudo >/dev/null
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# Passwordless sudo is a deliberate call, not laziness: this image autologins to an
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# unattended interactive Sway session at the physical console, so anyone standing in
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# front of the machine already has the equivalent of a root shell. Requiring a
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# password here would buy nothing while making the locked account unadministrable.
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# The boundaries that actually matter are the wayvnc password and key-only SSH below.
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cat > "/etc/sudoers.d/010-${KIOSK_USERNAME}" <<EOF
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${KIOSK_USERNAME} ALL=(ALL) NOPASSWD: ALL
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EOF
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chmod 0440 "/etc/sudoers.d/010-${KIOSK_USERNAME}"
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mkdir -p /etc/ssh/sshd_config.d
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cat > /etc/ssh/sshd_config.d/10-thin-client.conf <<'EOF'
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PermitRootLogin no
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PasswordAuthentication no
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KbdInteractiveAuthentication no
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PubkeyAuthentication yes
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EOF
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if [ -d "/home/${KIOSK_USERNAME}/.ssh" ]; then
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chmod 700 "/home/${KIOSK_USERNAME}/.ssh"
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[ -f "/home/${KIOSK_USERNAME}/.ssh/authorized_keys" ] && \
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chmod 600 "/home/${KIOSK_USERNAME}/.ssh/authorized_keys"
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fi
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chown -R "${KIOSK_USERNAME}:${KIOSK_USERNAME}" "/home/${KIOSK_USERNAME}"
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systemctl enable ssh >/dev/null 2>&1 || true
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