debian-cis/bin/hardening/13.5_find_0_uid_non_root_account.sh

#!/bin/bash

#
# CIS Debian 7 Hardening
#

#
# 13.5 Verify No UID 0 Accounts Exist Other Than root (Scored)
#

set -e # One error, it's over
set -u # One variable unset, it's over

FILE='/etc/passwd'
RESULT=''

# This function will be called if the script status is on enabled / audit mode
audit () {
    info "Checking if accounts have uid 0"
    RESULT=$(cat $FILE | awk -F: '($3 == 0 && $1!="root" ) { print $1 }')
    for ACCOUNT in $RESULT; do
        debug "Account : $ACCOUNT"
        debug "Exceptions : $EXCEPTIONS"
        debug "echo \"$EXCEPTIONS\" | grep -q $ACCOUNT"
        if echo "$EXCEPTIONS" | grep -q $ACCOUNT; then
            debug "$ACCOUNT is confirmed as an exception"
            RESULT=$(sed "s!$ACCOUNT!!" <<< "$RESULT")
        else
            debug "$ACCOUNT not found in exceptions"
        fi
    done
    if [ ! -z "$RESULT" ]; then
        crit "Some accounts have uid 0"
        crit $RESULT
    else
        ok "No account with suid 0 apart root" 
    fi
}

# This function will be called if the script status is on enabled mode
apply () {
    info "Removing accounts with uid 0 may seriously harm your system, report only here"
}

# This function will check config parameters required
check_config() {
    if [ -z "$EXCEPTIONS" ]; then
        EXCEPTIONS="@"
    fi
}

# Source Root Dir Parameter
if [ ! -r /etc/default/cis-hardening ]; then
    echo "There is no /etc/default/cis-hardening file, cannot source CIS_ROOT_DIR variable, aborting"
    exit 128
else
    . /etc/default/cis-hardening
    if [ -z $CIS_ROOT_DIR ]; then
        echo "No CIS_ROOT_DIR variable, aborting"
    fi
fi 

# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
[ -r $CIS_ROOT_DIR/lib/main.sh ] && . $CIS_ROOT_DIR/lib/main.sh