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@@ -6,17 +6,21 @@
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# base folder
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BASE_FOLDER=$(dirname $(readlink -f $0))"/";
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# which groups holds the ssh allowed login users (outside of admin users)
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ssh_groups=('sshforward' 'sshallow');
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ssh_groups=('sshforward' 'sshallow' 'sshreject');
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ssh_reject_group='sshreject';
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# date now for compare
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now=$(date +"%s");
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# max age for last login or account create without login
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max_age_login=60;
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max_age_login=90;
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max_age_create=30;
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# one day in seconds
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day=86400;
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# delete account strings
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lock_accounts="";
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unlock_flag=0;
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unlock_accounts="";
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# only needed for json output
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first_run=1;
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# log base folder
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LOG="${BASE_FOLDER}/../log";
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# auth log file user;date from collect_login_data script
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@@ -30,37 +34,108 @@ if [ ! -d "${LOG}" ]; then
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echo "log folder ${LOG} not found";
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exit;
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fi;
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LOG="${LOG}/check_ssh_user."$(date +"%F_%H%m%S")".log";
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exec &> >(tee -a "${LOG}");
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echo "[START] =============>";
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echo "Hostname : "$(hostname);
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echo "Run date : "$(date +"%F %T");
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echo "Max age last login: ${max_age_login} days";
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echo "Max age no login : ${max_age_create} days";
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# option 1 in list
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case "${1,,}" in
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text)
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OUTPUT_TARGET="text";
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;;
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json)
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OUTPUT_TARGET="json";
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echo "{";
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;;
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csv)
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OUTPUT_TARGET="csv";
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echo "Hostname,Username,Main Group,SSH Group,Account Created Date,Account Age,Last Login Date,Last Login Age,Never Logged In,Login Source,Status";
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;;
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*)
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OUTPUT_TARGET="text";
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;;
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esac;
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if [ "${OUTPUT_TARGET}" == "text" ]; then
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LOG="${LOG}/check_ssh_user."$(date +"%F_%H%m%S")".log";
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exec &> >(tee -a "${LOG}");
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echo "[START] =============>";
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echo "Hostname : "$(hostname);
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echo "Run date : "$(date +"%F %T");
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echo "Max age last login: ${max_age_login} days";
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echo "Max age no login : ${max_age_create} days";
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elif [ "${OUTPUT_TARGET}" == "json" ]; then
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echo '"Info": {'
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echo '"Hostname": "'$(hostname)'",';
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echo '"Date": "'$(date +"%F %T")'",';
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echo '"MaxAgeLogin": '${max_age_login}',';
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echo '"MaxAgeCreate": '${max_age_create}'';
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echo '},'
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echo '"Users": ['
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fi;
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for ssh_group in ${ssh_groups[@]}; do
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echo "--------------------->"
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echo "Checking Group : ${ssh_group}";
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if [ "${OUTPUT_TARGET}" == "text" ]; then
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echo "--------------------->"
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if [ "${ssh_group}" == "${ssh_reject_group}" ]; then
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echo "Showing current SSH Reject users:";
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unlock_flag=1
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else
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echo "Checking Group : ${ssh_group}";
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fi;
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fi;
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for username in $(cat /etc/group|grep "${ssh_group}:" | cut -d ":" -f 4 | sed -e 's/,/ /g'); do
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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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out_string="[!] User $username does not exists in /etc/passwd file";
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case "${OUTPUT_TARGET}" in
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text)
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echo "${out_string}";
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;;
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json)
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echo "{";
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echo '"Username": "'${username}'",';
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echo '"SshGroup": "'${ssh_group}'",';
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echo '"MainGroup": "",';
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echo '"SubGroups": [],';
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echo '"AccountCreatedDate": "",';
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echo '"AccountAge": "",';
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echo '"LastLoginDate": "",';
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echo '"LastLoginAge": "",';
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echo '"LoginSource": "",';
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echo '"NeverLoggedIn": true,';
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echo '"Status": "'${out_string}'"';
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echo "}";
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;;
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csv)
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printf "%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s\n" "$(hostname)" "${username}" "" "${ssh_group}" "" "" "" "" "true" "${out_string}"
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;;
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esac;
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continue;
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fi;
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# for json output, we need , between outputs
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if [ "${OUTPUT_TARGET}" == "json" ] && [ $first_run -eq 0 ]; then
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echo ",";
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fi;
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first_run=0;
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# unlock lis of users
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if [ $unlock_flag -eq 1 ]; then
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unlock_accounts="${unlock_accounts} ${username}"
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fi;
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account_age=0;
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lock_user=0;
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out_string="";
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# get the main group for this user
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main_group=$(id -gn "${username}")
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# get all the sub groups for this user, and remove the main groups
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sub_groups=$(id -Gn "${username}" | sed -e "s/${main_group}//" | sed -e "s/${ssh_group}//")
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#echo "* Checking user ${username}";
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# check user create time, if we have set it in comment
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user_create_date=$(cat /etc/passwd | grep "${username}:" | cut -d ":" -f 5);
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user_create_date_string=$(cat /etc/passwd | grep "${username}:" | cut -d ":" -f 5);
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# if empty try last password set time
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if [ -z "${user_create_date}" ]; then
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if [ -z "${user_create_date_string}" ]; then
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# user L 11/09/2020 0 99999 7 -1
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user_create_date=$(passwd -S ${username} | cut -d " " -f 3);
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user_create_date_string=$(passwd -S ${username} | cut -d " " -f 3);
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fi;
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# last try is user home .bash_logout
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if [ -z "${user_create_date}" ]; then
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if [ -z "${user_create_date_string}" ]; then
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home_dir=$(cat /etc/passwd | grep "${username}:" | cut -d ":" -f 6)"/.bash_logout";
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user_create_date=$(stat -c %Z "${home_dir}");
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user_create_date_string=$(stat -c %Z "${home_dir}");
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fi;
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# below only works if the user logged in, a lot of them are just file upload
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@@ -69,13 +144,28 @@ echo "Checking Group : ${ssh_group}";
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# user pts/35 10.110.160.230 Wed Nov 2 09:40:35 +0900 2022
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last_login_string=$(lastlog -u ${username} | sed 1d);
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search="Never logged in";
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never_logged_in="false";
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found="";
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login_source="";
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last_login_date="";
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account_age="";
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last_login="";
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# problem with running rep check in if
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if [ -f "${AUTH_LOG}" ]; then
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found=$(grep "${username};" "${AUTH_LOG}");
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fi;
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# always pre work account dates if they exist, but output only if text
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if [ ! -z "${user_create_date_string}" ]; then
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user_create_date=$(echo "${user_create_date_string}" | date +"%s" -f -);
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# if all empty, we continue with only check if user has last login date
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# else get days since creation
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#account_age=$[ ($(date +"%s")-$(date -d "${user_create_date}" +"%s"))/24 ];
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account_age=$(awk '{printf("%.0f\n",($1-$2)/$3)}' <<<"${now} ${user_create_date} ${day}");
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user_create_date_out=$(echo "${user_create_date_string}" | date +"%F" -f -);
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fi;
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if [ ! -z "${found}" ]; then
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last_login_date=$(grep "${username};" "${AUTH_LOG}" | cut -d ";" -f 2 | date +"%s" -f -);
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last_login_date_string=$(grep "${username};" "${AUTH_LOG}" | cut -d ";" -f 2);
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last_login_date=$(echo "${last_login_date}" | date +"%s" -f -);
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last_login=$(awk '{printf("%.0f\n",($1-$2)/$3)}' <<<"${now} ${last_login_date} ${day}");
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if [ ${last_login} -gt ${max_age_login} ]; then
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out_string="[!] last ssh log in ${last_login} days ago";
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@@ -83,6 +173,9 @@ echo "Checking Group : ${ssh_group}";
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else
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out_string="OK [ssh]";
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fi;
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login_source="ssh";
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# rewrite to Y-M-D, aka
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last_login_date="${last_login_date_string}"
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elif [ ! -z "${last_login_string##*$search*}" ]; then
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# if we have "** Never logged in**" the user never logged in
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# find \w{3} \w{3} [\s\d]{2} \d{2}:\d{2}:\d{2} \+\d{4} \d{4}
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@@ -96,39 +189,82 @@ echo "Checking Group : ${ssh_group}";
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else
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out_string="OK [lastlog]";
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fi;
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login_source="lastlog";
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last_login_date=$(echo "${last_login_string}" | awk '{for(i=4;i<=NF;++i)printf $i FS}' | date +"%F %T" -f -)
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elif [ ! -z "${user_create_date}" ]; then
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user_create_date=$(echo "${user_create_date}" | date +"%s" -f -);
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# if all empty, we continue with only check if user has last login date
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# else get days since creation
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#account_age=$[ ($(date +"%s")-$(date -d "${user_create_date}" +"%s"))/24 ];
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account_age=$(awk '{printf("%.0f\n",($1-$2)/$3)}' <<<"${now} ${user_create_date} ${day}");
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if [ ${account_age} -gt ${max_age_create} ]; then
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out_string="[!] Never logged in, account created ${account_age} days ago";
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out_string="[!] Never logged in: account created ${account_age} days ago";
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lock_user=1;
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else
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out_string="OK [first login]";
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out_string="OK [Never logged in]";
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fi;
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never_logged_in="true";
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else
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out_string="[!!!] Never logged in and we have no create date";
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never_logged_in="true";
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fi;
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# build delete output
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if [ ${lock_user} = 1 ]; then
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lock_accounts="${lock_accounts} ${username}"
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fi;
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printf "* Checking user %-20s: %s\n" "${username}" "${out_string}";
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case "${OUTPUT_TARGET}" in
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text)
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printf "* Checking user %-20s (%-20s): %s\n" "${username}" "${main_group}" "${out_string}";
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;;
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json)
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sub_groups_string="["
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sub_group_first=1
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for s_group in $sub_groups; do
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if [ "${sub_group_first}" == 0 ]; then
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sub_groups_string="${sub_groups_string},";
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fi;
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sub_groups_string="${sub_groups_string}\"${s_group}\"";
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sub_group_first=0;
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done;
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sub_groups_string="${sub_groups_string}]";
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echo "{";
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echo '"Username": "'${username}'",';
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echo '"SshGroup": "'${ssh_group}'",';
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echo '"MainGroup": "'${main_group}'",';
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echo '"SubGroups": '${sub_groups_string}',';
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echo '"AccountCreatedDate": "'${user_create_date_out}'",';
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echo '"AccountAge": "'${account_age}'",';
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echo '"LastLoginDate": "'${last_login_date}'",';
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echo '"LastLoginAge": "'${last_login}'",';
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echo '"LoginSource": "'${login_source}'",';
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echo '"NeverLoggedIn": '${never_logged_in}',';
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echo '"Status": "'${out_string}'"';
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echo "}";
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;;
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csv)
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printf "%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s\n" "$(hostname)" "${username}" "${main_group}" "${ssh_group}" "${user_create_date_out}" "${account_age}" "${last_login_date}" "${last_login}" "${never_logged_in}" "${login_source}" "${out_string}"
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;;
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esac;
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done;
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done;
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echo "--------------------->"
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echo "Showing current SSH Reject users:"
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for user in $(cat /etc/group|grep "${ssh_reject_group}:" | cut -d ":" -f 4 | sed -e 's/,/ /g'); do
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echo "${user}";
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done;
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if [ ! -z "${lock_accounts}" ]; then
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echo "--------------------->"
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echo "% Run script below to move users to reject ssh group";
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echo "";
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echo "bin/lock_user.sh ${lock_accounts}";
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if [ "${OUTPUT_TARGET}" == "text" ]; then
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if [ ! -z "${lock_accounts}" ]; then
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echo "--------------------->"
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echo "% Run script below to move users to reject ssh group";
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echo "";
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echo "bin/lock_user.sh ${lock_accounts}";
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fi;
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if [ ! -z "${unlock_accounts}" ]; then
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echo "--------------------->"
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echo "% Run script below to move users to allow or forward ssh group";
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echo "";
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echo "For ALLOW:"
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echo "bin/unlock_user.sh -s allow ${lock_accounts}";
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echo "";
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echo "For FORWARDONLY:"
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echo "bin/unlock_user.sh -s forward ${lock_accounts}";
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fi;
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echo "[END] ===============>"
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elif [ "${OUTPUT_TARGET}" == "json" ]; then
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# users
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echo "]";
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# overall
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echo "}";
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fi;
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echo "[END] ===============>"
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# __END__
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