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127 lines
3.9 KiB
Bash
Executable File
127 lines
3.9 KiB
Bash
Executable File
#!/bin/bash
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# run-shellcheck
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#
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# CIS Debian Hardening
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#
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#
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# 5.4.2 Ensure system accounts are non-login (Scored)
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#
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set -e # One error, it's over
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set -u # One variable unset, it's over
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# shellcheck disable=2034
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HARDENING_LEVEL=3
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# shellcheck disable=2034
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DESCRIPTION="Disable system accounts, preventing them from interactive login."
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ACCEPTED_SHELLS='/bin/false /usr/sbin/nologin /sbin/nologin'
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SHELL_TO_APPLY='/bin/false'
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FILE='/etc/passwd'
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RESULT=''
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ACCEPTED_SHELLS_GREP=''
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# This function will be called if the script status is on enabled / audit mode
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audit() {
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shells_to_grep_helper
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info "Checking if admin accounts have a login shell different than $ACCEPTED_SHELLS"
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RESULT=$(egrep -v "^\+" $FILE | awk -F: '($1!="root" && $1!="sync" && $1!="shutdown" && $1!="halt" && $3<1000 ) {print}' | grep -v $ACCEPTED_SHELLS_GREP || true)
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IFS_BAK=$IFS
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IFS=$'\n'
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for LINE in $RESULT; do
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debug "line : $LINE"
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ACCOUNT=$(echo "$LINE" | cut -d: -f 1)
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debug "Account : $ACCOUNT"
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debug "Exceptions : $EXCEPTIONS"
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debug "echo \"$EXCEPTIONS\" | grep -q $ACCOUNT"
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if echo "$EXCEPTIONS" | grep -q "$ACCOUNT"; then
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debug "$ACCOUNT is confirmed as an exception"
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RESULT=$(sed "s!$LINE!!" <<<"$RESULT")
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else
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debug "$ACCOUNT not found in exceptions"
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fi
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done
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IFS=$IFS_BAK
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if [ -n "$RESULT" ]; then
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crit "Some admin accounts don't have any of $ACCEPTED_SHELLS as their login shell"
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crit "$RESULT"
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else
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ok "All admin accounts deactivated"
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply() {
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RESULT=$(egrep -v "^\+" $FILE | awk -F: '($1!="root" && $1!="sync" && $1!="shutdown" && $1!="halt" && $3<1000 ) {print}' | grep -v $ACCEPTED_SHELLS_GREP || true)
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IFS_BAK=$IFS
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IFS=$'\n'
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for LINE in $RESULT; do
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debug "line : $LINE"
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ACCOUNT=$(echo "$LINE" | cut -d: -f 1)
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debug "Account : $ACCOUNT"
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debug "Exceptions : $EXCEPTIONS"
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debug "echo \"$EXCEPTIONS\" | grep -q $ACCOUNT"
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if echo "$EXCEPTIONS" | grep -q "$ACCOUNT"; then
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debug "$ACCOUNT is confirmed as an exception"
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RESULT=$(sed "s!$LINE!!" <<<"$RESULT")
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else
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debug "$ACCOUNT not found in exceptions"
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fi
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done
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IFS=$IFS_BAK
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if [ -n "$RESULT" ]; then
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warn "Some admin accounts don't have any of $ACCEPTED_SHELLS as their login shell -- Fixing"
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warn "$RESULT"
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for USER in $(echo "$RESULT" | cut -d: -f 1); do
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info "Setting $SHELL_TO_APPLY as $USER login shell"
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usermod -s "$SHELL_TO_APPLY" "$USER"
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done
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else
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ok "All admin accounts deactivated, nothing to apply"
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fi
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}
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shells_to_grep_helper() {
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for shell in $ACCEPTED_SHELLS; do
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ACCEPTED_SHELLS_GREP+=" -e $shell"
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done
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}
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# This function will create the config file for this check with default values
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create_config() {
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cat <<EOF
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status=audit
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# Put here your exceptions concerning admin accounts shells separated by spaces
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EXCEPTIONS=""
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EOF
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}
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# This function will check config parameters required
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check_config() {
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if [ -z "$EXCEPTIONS" ]; then
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EXCEPTIONS="@"
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fi
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$CIS_ROOT_DIR" ]; then
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echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
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echo "Cannot source CIS_ROOT_DIR variable, aborting."
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exit 128
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fi
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# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
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if [ -r "$CIS_ROOT_DIR"/lib/main.sh ]; then
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# shellcheck source=../../lib/main.sh
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. "$CIS_ROOT_DIR"/lib/main.sh
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else
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echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
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exit 128
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fi
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