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admin-init.sh
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| #! /usr/bin/env bash | |
| # | |
| # ssh admin user creation script | |
| # | |
| # https://gist.github.com/NickKelly1/a2f873394c084597744fec1a744b44d0 | |
| # | |
| # usage: | |
| # # curl -s https://gist.github.com/NickKelly1/a2f873394c084597744fec1a744b44d0/raw > admin-init.sh | |
| # # chmod +x ./createuser.sh | |
| # # ./createuser.sh | |
| # # rm ./createuser.sh | |
| # | |
| # author: Nick Kelly | |
| # created: 2022-04-24 | |
| # updated: 2022-04-24 | |
| # | |
| # Goal: | |
| # - create a user that can log in via ssh | |
| # - the user should be part of the sudo group | |
| # - the user should have no password (so they don't need to remember & enter password to sudo) | |
| # - the users password should be deactivated (so password login is unavailable from remote and | |
| # from other users) | |
| # | |
| set -euo pipefail | |
| echo | |
| echo "===================================" | |
| echo "=== Initialising new admin user ===" | |
| echo "=== author: Nick Kelly ===" | |
| echo "=== created: 2022-04-24 ===" | |
| echo "=== updated: 2022-04-24 ===" | |
| echo "===================================" | |
| echo | |
| if [[ "$EUID" -ne 0 ]]; then | |
| echo "Error: Please run as root with sudo." | |
| exit 1 | |
| fi | |
| ADMIN_USERNAME= | |
| read -e -p "Admin username: " -i "admin" ADMIN_USERNAME | |
| if [[ ! "${ADMIN_USERNAME}" ]]; then | |
| echo "Error: no username." | |
| exit 1; | |
| fi | |
| echo "Creating ${ADMIN_USERNAME}" | |
| # gecos: non-interactive (don't ask for additional details) | |
| # disabled-password: disable password login (still allow with sudo / ssh) | |
| adduser --gecos "" --disabled-password "${ADMIN_USERNAME}" | |
| # # remove password to let the user "sudo" without entering password | |
| # echo "Removing ${ADMIN_USERNAME}'s password" | |
| # passwd --delete "${ADMIN_USERNAME}" | |
| # # disable user login (--disabled-password doesn't ?always work?) | |
| # echo "Disabling password login to ${ADMIN_USERNAME}" | |
| # usermod --lock "${ADMIN_USERNAME}" | |
| echo "Adding ${ADMIN_USERNAME} to group: sudo" | |
| usermod -a -G sudo "${ADMIN_USERNAME}" | |
| echo "Removing sudo password requirement from ${ADMIN_USERNAME}" | |
| if [[ -f "/etc/sudoers.d/${ADMIN_USERNAME}" ]]; then | |
| echo "Warning: /etc/sudoers.d/${ADMIN_USERNAME} already exists." | |
| echo "Warning: Not removing sudo password requirement." | |
| else | |
| # remove sudo password requirement for ADMIN_USERNAME | |
| cat << EOF >> "/etc/sudoers.d/${ADMIN_USERNAME}" | |
| ${ADMIN_USERNAME} ALL=(ALL) NOPASSWD:ALL | |
| EOF | |
| fi | |
| echo "Setting umask for $(umask -S)" | |
| umask 077 | |
| echo "Creating .ssh directory" | |
| mkdir "/home/${ADMIN_USERNAME}/.ssh" | |
| echo "Creating .ssh/authorized_keys file" | |
| touch "/home/${ADMIN_USERNAME}/.ssh/authorized_keys" | |
| echo "Recursively setting ownership of .ssh directory" | |
| chown -R "${ADMIN_USERNAME}:${ADMIN_USERNAME}" "/home/${ADMIN_USERNAME}/.ssh" | |
| echo "Resetting umask for u=rwx,g=rwx,o=rx" | |
| umask 002 | |
| echo "Finished." | |
| echo "Next steps:" | |
| echo " - Put the users public ssh key into /home/${ADMIN_USERNAME}/.ssh/authorized_keys" | |
| echo " eg rsync --archive --chown ${ADMIN_USERNAME}:${ADMIN_USERNAME} ~/.ssh /home/${ADMIN_USERNAME}" | |
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