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7690b57ea9
becho stands for batch echo formats the log line for syslog Also logs audit summary into syslog (in batch mode only)
289 lines
10 KiB
Bash
Executable File
289 lines
10 KiB
Bash
Executable File
#!/bin/bash
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#
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# CIS Debian Hardening
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# Authors : Thibault Dewailly, OVH <thibault.dewailly@corp.ovh.com>
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#
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#
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# Main script : Execute hardening considering configuration
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#
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LONG_SCRIPT_NAME=$(basename $0)
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SCRIPT_NAME=${LONG_SCRIPT_NAME%.sh}
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DISABLED_CHECKS=0
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PASSED_CHECKS=0
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FAILED_CHECKS=0
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TOTAL_CHECKS=0
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TOTAL_TREATED_CHECKS=0
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AUDIT=0
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APPLY=0
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AUDIT_ALL=0
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AUDIT_ALL_ENABLE_PASSED=0
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ALLOW_SERVICE_LIST=0
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SET_HARDENING_LEVEL=0
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SUDO_MODE=''
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BATCH_MODE=''
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usage() {
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cat << EOF
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$LONG_SCRIPT_NAME <RUN_MODE> [OPTIONS], where RUN_MODE is one of:
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--help -h
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Show this help
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--apply
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Apply hardening for enabled scripts.
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Beware that NO confirmation is asked whatsoever, which is why you're warmly
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advised to use --audit before, which can be regarded as a dry-run mode.
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--audit
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Audit configuration for enabled scripts.
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No modification will be made on the system, we'll only report on your system
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compliance for each script.
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--audit-all
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Same as --audit, but for *all* scripts, even disabled ones.
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This is a good way to peek at your compliance level if all scripts were enabled,
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and might be a good starting point.
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--audit-all-enable-passed
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Same as --audit-all, but in addition, will *modify* the individual scripts
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configurations to enable those which passed for your system.
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This is an easy way to enable scripts for which you're already compliant.
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However, please always review each activated script afterwards, this option
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should only be regarded as a way to kickstart a configuration from scratch.
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Don't run this if you have already customized the scripts enable/disable
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configurations, obviously.
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--set-hardening-level <level>
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Modifies the configuration to enable/disable tests given an hardening level,
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between 1 to 5. Don't run this if you have already customized the scripts
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enable/disable configurations.
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1: very basic policy, failure to pass tests at this level indicates severe
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misconfiguration of the machine that can have a huge security impact
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2: basic policy, some good practice rules that, once applied, shouldn't
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break anything on most systems
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3: best practices policy, passing all tests might need some configuration
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modifications (such as specific partitioning, etc.)
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4: high security policy, passing all tests might be time-consuming and
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require high adaptation of your workflow
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5: placebo, policy rules that might be very difficult to apply and maintain,
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with questionable security benefits
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--allow-service <service>
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Use with --set-hardening-level.
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Modifies the policy to allow a certain kind of services on the machine, such
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as http, mail, etc. Can be specified multiple times to allow multiple services.
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Use --allow-service-list to get a list of supported services.
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OPTIONS:
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--only <test_number>
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Modifies the RUN_MODE to only work on the test_number script.
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Can be specified multiple times to work only on several scripts.
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The test number is the numbered prefix of the script,
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i.e. the test number of 1.2_script_name.sh is 1.2.
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--sudo
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This option lets you audit your system as a normal user, but allows sudo
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escalation to gain read-only access to root files. Note that you need to
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provide a sudoers file with NOPASSWD option in /etc/sudoers.d/ because
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the '-n' option instructs sudo not to prompt for a password.
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Finally note that '--sudo' mode only works for audit mode.
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--batch
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While performing system audit, this option sets LOGLEVEL to 'ok' and
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captures all output to print only one line once the check is done, formatted like :
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OK|KO OK|KO|WARN{subcheck results} [OK|KO|WARN{...}]
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EOF
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exit 0
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}
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if [ $# = 0 ]; then
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usage
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fi
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declare -a TEST_LIST ALLOWED_SERVICES_LIST
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# Arguments parsing
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while [[ $# > 0 ]]; do
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ARG="$1"
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case $ARG in
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--audit)
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AUDIT=1
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;;
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--audit-all)
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AUDIT_ALL=1
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;;
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--audit-all-enable-passed)
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AUDIT_ALL_ENABLE_PASSED=1
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;;
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--apply)
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APPLY=1
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;;
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--allow-service-list)
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ALLOW_SERVICE_LIST=1
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;;
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--allow-service)
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ALLOWED_SERVICES_LIST[${#ALLOWED_SERVICES_LIST[@]}]="$2"
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shift
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;;
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--set-hardening-level)
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SET_HARDENING_LEVEL="$2"
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shift
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;;
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--only)
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TEST_LIST[${#TEST_LIST[@]}]="$2"
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shift
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;;
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--sudo)
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SUDO_MODE='--sudo'
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;;
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--batch)
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BATCH_MODE='--batch'
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LOGLEVEL=ok
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;;
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-h|--help)
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usage
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;;
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*)
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usage
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;;
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esac
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shift
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done
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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. /etc/default/cis-hardening
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fi
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if [ -z "$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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[ -r $CIS_ROOT_DIR/lib/constants.sh ] && . $CIS_ROOT_DIR/lib/constants.sh
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[ -r $CIS_ROOT_DIR/etc/hardening.cfg ] && . $CIS_ROOT_DIR/etc/hardening.cfg
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[ -r $CIS_ROOT_DIR/lib/common.sh ] && . $CIS_ROOT_DIR/lib/common.sh
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[ -r $CIS_ROOT_DIR/lib/utils.sh ] && . $CIS_ROOT_DIR/lib/utils.sh
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if [ $BATCH_MODE ]; then MACHINE_LOG_LEVEL=3; fi
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# If --allow-service-list is specified, don't run anything, just list the supported services
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if [ "$ALLOW_SERVICE_LIST" = 1 ] ; then
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declare -a HARDENING_EXCEPTIONS_LIST
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for SCRIPT in $(ls $CIS_ROOT_DIR/bin/hardening/*.sh -v); do
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template=$(grep "^HARDENING_EXCEPTION=" "$SCRIPT" | cut -d= -f2)
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[ -n "$template" ] && HARDENING_EXCEPTIONS_LIST[${#HARDENING_EXCEPTIONS_LIST[@]}]="$template"
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done
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echo "Supported services are: "$(echo "${HARDENING_EXCEPTIONS_LIST[@]}" | tr " " "\n" | sort -u | tr "\n" " ")
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exit 0
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fi
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# If --set-hardening-level is specified, don't run anything, just apply config for each script
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if [ -n "$SET_HARDENING_LEVEL" -a "$SET_HARDENING_LEVEL" != 0 ] ; then
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if ! grep -q "^[12345]$" <<< "$SET_HARDENING_LEVEL" ; then
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echo "Bad --set-hardening-level specified ('$SET_HARDENING_LEVEL'), expected 1 to 5"
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exit 1
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fi
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for SCRIPT in $(ls $CIS_ROOT_DIR/bin/hardening/*.sh -v); do
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SCRIPT_BASENAME=$(basename $SCRIPT .sh)
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script_level=$(grep "^HARDENING_LEVEL=" "$SCRIPT" | cut -d= -f2)
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if [ -z "$script_level" ] ; then
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echo "The script $SCRIPT_BASENAME doesn't have a hardening level, configuration untouched for it"
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continue
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fi
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wantedstatus=disabled
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[ "$script_level" -le "$SET_HARDENING_LEVEL" ] && wantedstatus=enabled
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sed -i -re "s/^status=.+/status=$wantedstatus/" $CIS_ROOT_DIR/etc/conf.d/$SCRIPT_BASENAME.cfg
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done
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echo "Configuration modified to enable scripts for hardening level at or below $SET_HARDENING_LEVEL"
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exit 0
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fi
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# Parse every scripts and execute them in the required mode
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for SCRIPT in $(ls $CIS_ROOT_DIR/bin/hardening/*.sh -v); do
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if [ ${#TEST_LIST[@]} -gt 0 ] ; then
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# --only X has been specified at least once, is this script in my list ?
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SCRIPT_PREFIX=$(grep -Eo '^[0-9.]+' <<< "$(basename $SCRIPT)")
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SCRIPT_PREFIX_RE=$(sed -e 's/\./\\./g' <<< "$SCRIPT_PREFIX")
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if ! grep -qE "(^| )$SCRIPT_PREFIX_RE" <<< "${TEST_LIST[@]}"; then
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# not in the list
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continue
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fi
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fi
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info "Treating $SCRIPT"
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if [ $AUDIT = 1 ]; then
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debug "$CIS_ROOT_DIR/bin/hardening/$SCRIPT --audit $SUDO_MODE $BATCH_MODE"
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$SCRIPT --audit $SUDO_MODE $BATCH_MODE
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elif [ $AUDIT_ALL = 1 ]; then
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debug "$CIS_ROOT_DIR/bin/hardening/$SCRIPT --audit-all $SUDO_MODE $BATCH_MODE"
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$SCRIPT --audit-all $SUDO_MODE $BATCH_MODE
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elif [ $AUDIT_ALL_ENABLE_PASSED = 1 ]; then
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debug "$CIS_ROOT_DIR/bin/hardening/$SCRIPT --audit-all $SUDO_MODE" $BATCH_MODE
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$SCRIPT --audit-all $SUDO_MODE $BATCH_MODE
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elif [ $APPLY = 1 ]; then
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debug "$CIS_ROOT_DIR/bin/hardening/$SCRIPT"
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$SCRIPT
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fi
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SCRIPT_EXITCODE=$?
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debug "Script $SCRIPT finished with exit code $SCRIPT_EXITCODE"
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case $SCRIPT_EXITCODE in
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0)
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debug "$SCRIPT passed"
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PASSED_CHECKS=$((PASSED_CHECKS+1))
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if [ $AUDIT_ALL_ENABLE_PASSED = 1 ] ; then
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SCRIPT_BASENAME=$(basename $SCRIPT .sh)
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sed -i -re 's/^status=.+/status=enabled/' $CIS_ROOT_DIR/etc/conf.d/$SCRIPT_BASENAME.cfg
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info "Status set to enabled in $CIS_ROOT_DIR/etc/conf.d/$SCRIPT_BASENAME.cfg"
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fi
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;;
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1)
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debug "$SCRIPT failed"
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FAILED_CHECKS=$((FAILED_CHECKS+1))
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;;
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2)
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debug "$SCRIPT is disabled"
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DISABLED_CHECKS=$((DISABLED_CHECKS+1))
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;;
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esac
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TOTAL_CHECKS=$((TOTAL_CHECKS+1))
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done
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TOTAL_TREATED_CHECKS=$((TOTAL_CHECKS-DISABLED_CHECKS))
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if [ $BATCH_MODE ]; then
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BATCH_SUMMARY="AUDIT_SUMMARY "
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BATCH_SUMMARY+="PASSED_CHECKS:${PASSED_CHECKS:-0} "
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BATCH_SUMMARY+="RUN_CHECKS:${TOTAL_TREATED_CHECKS:-0} "
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BATCH_SUMMARY+="TOTAL_CHECKS_AVAIL:${TOTAL_CHECKS:-0}"
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if [ $TOTAL_TREATED_CHECKS != 0 ]; then
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BATCH_SUMMARY+=" CONFORMITY_PERCENTAGE:$(printf "%.2f" $( echo "($PASSED_CHECKS/$TOTAL_TREATED_CHECKS) * 100" | bc -l))"
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else
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BATCH_SUMMARY+=" CONFORMITY_PERCENTAGE:N.A" # No check runned, avoid division by 0
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fi
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becho $BATCH_SUMMARY
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else
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printf "%40s\n" "################### SUMMARY ###################"
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printf "%30s %s\n" "Total Available Checks :" "$TOTAL_CHECKS"
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printf "%30s %s\n" "Total Runned Checks :" "$TOTAL_TREATED_CHECKS"
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printf "%30s [ %7s ]\n" "Total Passed Checks :" "$PASSED_CHECKS/$TOTAL_TREATED_CHECKS"
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printf "%30s [ %7s ]\n" "Total Failed Checks :" "$FAILED_CHECKS/$TOTAL_TREATED_CHECKS"
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printf "%30s %.2f %%\n" "Enabled Checks Percentage :" "$( echo "($TOTAL_TREATED_CHECKS/$TOTAL_CHECKS) * 100" | bc -l)"
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if [ $TOTAL_TREATED_CHECKS != 0 ]; then
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printf "%30s %.2f %%\n" "Conformity Percentage :" "$( echo "($PASSED_CHECKS/$TOTAL_TREATED_CHECKS) * 100" | bc -l)"
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else
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printf "%30s %s %%\n" "Conformity Percentage :" "N.A" # No check runned, avoid division by 0
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fi
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fi
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