1f4e295e9f
Make sure that lock script reejcts core users (root/ec2-user/admin/ubuntu) Unlock script works reverse with also optional check in user_list.txt for ssh allow/foward group type Internal: rename all $user to $username
97 lines
2.9 KiB
Bash
Executable File
97 lines
2.9 KiB
Bash
Executable File
#!/usr/bin/env bash
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# disable a user by removing them from the sshallow/sshforward group
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# and move them to the sshreject group
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# Note that call is ./lock_user.sh -t <user 1> <user 2> ...
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# if the -t is not in the first position it will be ignored
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# SET TO 1 to TEST [will not move user in groups]
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TEST=0; # no delete, just print
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while getopts ":t" opt; do
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case "${opt}" in
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t|test)
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TEST=1;
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;;
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esac;
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done;
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shift "$((OPTIND-1))"
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if [ $(whoami) != "root" ]; then
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if [ ${TEST} -eq 0 ]; then
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echo "Script must be run as root user";
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exit;
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else
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echo "!!!! Script must be run as root user !!!!";
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fi;
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fi;
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if [ $# -eq 0 ]; then
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echo "Must give at least one user name";
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exit;
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fi;
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# ignore users (root and admin users)
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ignore_users=('root' 'ec2-user' 'ubuntu' 'admin');
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# ssh reject group
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ssh_reject_group="sshreject";
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if [ -z $(cat /etc/group | grep "${ssh_reject_group}:") ]; then
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echo "Missing ssh reject group: ${ssh_reject_group}";
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exit;
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fi;
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ssh_allow_group="sshallow";
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ssh_forward_group="sshfoward";
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user_group_tpl="gpasswd -d %s %s\ngpasswd -a %s %s\n";
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echo "--------------------->"
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# $1 ... $n
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for username in "$@"; do
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# skip if there is an option hidden
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if [[ ${_arg:0:1} = "-" ]]; then
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continue;
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fi;
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# skip ignore users, note that if a user is not in the sshallow list anyway
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# we skip them too, this is just in case check
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if [[ " ${ignore_users[*]} " =~ " ${username} " ]]; then
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echo "[!] User $username is in the ignore user list";
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continue;
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fi;
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# check that user exists in passwd
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if ! id "${username}" &>/dev/null; then
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echo "[!] User $username does not exists in /etc/passwd file";
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continue;
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fi;
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# if not check if in reject list
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if id -nGz "${username}" | grep -qzxF "${ssh_reject_group}"; then
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echo "[.] User $username already in the ${ssh_reject_group} list";
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continue;
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fi;
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# check if user is in sshallow/forward list
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ssh_remove_group='';
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if id -nGz "${username}" | grep -qzxF "${ssh_allow_group}"; then
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ssh_remove_group="${ssh_allow_group}";
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fi;
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# if user is in ssh allow group and ALSO in ssh forward group -> bad
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if id -nGz "${username}" | grep -qzxF "${ssh_forward_group}"; then
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if [ ! -z "${ssh_remove_group}" ]; then
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echo "[!!!! ERROR !!!!] User $username exists in both ${ssh_allow_group} and ${ssh_forward_group} group which should not be allowed. Remove user from one group and run script again.";
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break;
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fi;
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ssh_remove_group="${ssh_forward_group}";
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fi;
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if [ ! -z "${ssh_remove_group}" ]; then
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# remove user from ssh group and add to reject groups
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echo "[*] User $username will be removed from ${ssh_remove_group}";
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if [ ${TEST} -eq 1 ]; then
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printf "${user_group_tpl}" "${username}" "${ssh_remove_group}" "${username}" "${ssh_reject_group}";
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else
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gpasswd -d "${username}" "${ssh_remove_group}";
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gpasswd -a "${username}" "${ssh_reject_group}";
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fi;
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else
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# skip not ssh user
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echo "[?] User $username not in any ssh allow/foward groups";
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fi;
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done;
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# __END__
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