Add dealing with debian 11

* ADD: add dockerfile for debian11
* FIX: fix crontab file not found on debian11 blank
* Add workflow for debian11
* FIX: fix debian version func to manage debian11
* Add dealing with unsupported version and distro
* Add 99.99 check that check if distro version is supported
* Use global var for debian major and distro

fix #26

.github/workflows/functionnal-tests.yml

@@ -18,3 +18,10 @@ jobs:
         uses: actions/checkout@v2
       - name: Run the tests debian10
         run: ./tests/docker_build_and_run_tests.sh debian10
+  functionnal-tests-docker-debian11:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+      - name: Run the tests debian11
+        run: ./tests/docker_build_and_run_tests.sh debian11

MANUAL.md

@@ -124,6 +124,11 @@ will create a timestamped backup in this directory.
     captures all output to print only one line once the check is done, formatted like :
     OK|KO OK|KO|WARN{subcheck results} [OK|KO|WARN{...}]
 
+`--allow-unsupported-distribution`
+    Must be specified manually in the command line to allow the run on non compatible
+    version or distribution. If you want to mute the warning change the LOGLEVEL
+    in /etc/hardening.cfg
+
 
 # AUTHORS
 

README.md

@@ -44,7 +44,7 @@ hardening [INFO] Treating /opt/cis-hardening/bin/hardening/6.2.19_check_duplicat
 $ git clone https://github.com/ovh/debian-cis.git && cd debian-cis
 $ cp debian/default /etc/default/cis-hardening
 $ sed -i "s#CIS_ROOT_DIR=.*#CIS_ROOT_DIR='$(pwd)'#" /etc/default/cis-hardening
-$ bin/hardening/1.1_install_updates.sh --audit-all
+$ bin/hardening/1.1.1.1_disable_freevxfs.sh --audit-all
 hardening                 [INFO] Treating /opt/cis-hardening/bin/hardening/1.1.1.1_disable_freevxfs.sh
 1.1.1.1_disable_freevxfs  [INFO] Working on 1.1.1.1_disable_freevxfs
 1.1.1.1_disable_freevxfs  [INFO] [DESCRIPTION] Disable mounting of freevxfs filesystems.
@@ -123,6 +123,10 @@ Default value is : info
 ``--create-config-files-only``: create the config files in etc/conf.d. Must be run as root,
 before running the audit with user secaudit, to have the rights setup well on the conf files.
 
+``--allow-unsupported-distribution``: must be specified manually in the command line to allow 
+the run on non compatible version or distribution. If you want to mute the warning change the
+LOGLEVEL in /etc/hardening.cfg
+
 ## :computer: Hacking
 
 **Getting the source**

bin/hardening.sh

@@ -27,6 +27,7 @@ SET_HARDENING_LEVEL=0
 SUDO_MODE=''
 BATCH_MODE=''
 ASK_LOGLEVEL=''
+ALLOW_UNSUPPORTED_DISTRIBUTION=0
 
 usage() {
     cat <<EOF
@@ -107,6 +108,11 @@ OPTIONS:
         While performing system audit, this option sets LOGLEVEL to 'ok' and
         captures all output to print only one line once the check is done, formatted like :
         OK|KO OK|KO|WARN{subcheck results} [OK|KO|WARN{...}]
+    
+    --allow-unsupported-distribution
+        Must be specified manually in the command line to allow the run on non compatible
+        version or distribution. If you want to mute the warning change the LOGLEVEL
+        in /etc/hardening.cfg
 
 EOF
     exit 0
@@ -163,6 +169,9 @@ while [[ $# -gt 0 ]]; do
         BATCH_MODE='--batch'
         ASK_LOGLEVEL=ok
         ;;
+    --allow-unsupported-distribution)
+        ALLOW_UNSUPPORTED_DISTRIBUTION=1
+        ;;
     -h | --help)
         usage
         ;;
@@ -188,8 +197,7 @@ if [ -z "$CIS_ROOT_DIR" ]; then
     echo "Cannot source CIS_ROOT_DIR variable, aborting."
     exit 128
 fi
-# shellcheck source=../lib/constants.sh
-[ -r "$CIS_ROOT_DIR"/lib/constants.sh ] && . "$CIS_ROOT_DIR"/lib/constants.sh
+
 # shellcheck source=../etc/hardening.cfg
 [ -r "$CIS_ROOT_DIR"/etc/hardening.cfg ] && . "$CIS_ROOT_DIR"/etc/hardening.cfg
 if [ "$ASK_LOGLEVEL" ]; then LOGLEVEL=$ASK_LOGLEVEL; fi
@@ -197,6 +205,45 @@ if [ "$ASK_LOGLEVEL" ]; then LOGLEVEL=$ASK_LOGLEVEL; fi
 [ -r "$CIS_ROOT_DIR"/lib/common.sh ] && . "$CIS_ROOT_DIR"/lib/common.sh
 # shellcheck source=../lib/utils.sh
 [ -r "$CIS_ROOT_DIR"/lib/utils.sh ] && . "$CIS_ROOT_DIR"/lib/utils.sh
+# shellcheck source=../lib/constants.sh
+[ -r "$CIS_ROOT_DIR"/lib/constants.sh ] && . "$CIS_ROOT_DIR"/lib/constants.sh
+
+# If we're on a unsupported platform and there is no flag --allow-unsupported-distribution
+# print warning, otherwise quit
+
+if [ "$DISTRIBUTION" != "debian" ]; then
+    echo "Your distribution has been identified as $DISTRIBUTION which is not debian"
+    if [ "$ALLOW_UNSUPPORTED_DISTRIBUTION" -eq 0 ]; then
+        echo "If you want to run it anyway, you can use the flag --allow-unsupported-distribution"
+        echo "Exiting now"
+        exit 100
+    elif [ "$ALLOW_UNSUPPORTED_DISTRIBUTION" -eq 0 ] && [ "$MACHINE_LOG_LEVEL" -ge 2 ]; then
+        echo "Be aware that the result given by this set of scripts can give you a false feedback of security on unsupported distributions !"
+        echo "You can deactivate this message by setting the LOGLEVEL variable in /etc/hardening.cfg"
+    fi
+else
+    if [ "$DEB_MAJ_VER" = "sid" ] || [ "$DEB_MAJ_VER" -gt "$HIGHEST_SUPPORTED_DEBIAN_VERSION" ]; then
+        echo "Your debian version is too recent and is not supported yet because there is no official CIS PDF for this version yet."
+        if [ "$ALLOW_UNSUPPORTED_DISTRIBUTION" -eq 0 ]; then
+            echo "If you want to run it anyway, you can use the flag --allow-unsupported-distribution"
+            echo "Exiting now"
+            exit 100
+        elif [ "$ALLOW_UNSUPPORTED_DISTRIBUTION" -eq 0 ] && [ "$MACHINE_LOG_LEVEL" -ge 2 ]; then
+            echo "Be aware that the result given by this set of scripts can give you a false feedback of security on unsupported distributions !"
+            echo "You can deactivate this message by setting the LOGLEVEL variable in /etc/hardening.cfg"
+        fi
+    elif [ "$DEB_MAJ_VER" -lt "$SMALLEST_SUPPORTED_DEBIAN_VERSION" ]; then
+        echo "Your debian version is deprecated and is no more maintained. Please upgrade to a supported version."
+        if [ "$ALLOW_UNSUPPORTED_DISTRIBUTION" -eq 0 ]; then
+            echo "If you want to run it anyway, you can use the flag --allow-unsupported-distribution"
+            echo "Exiting now"
+            exit 100
+        elif [ "$ALLOW_UNSUPPORTED_DISTRIBUTION" -eq 0 ] && [ "$MACHINE_LOG_LEVEL" -ge 2 ]; then
+            echo "Be aware that the result given by this set of scripts can give you a false feedback of security on unsupported distributions, especially on deprecated ones !"
+            echo "You can deactivate this message by setting the LOGLEVEL variable in /etc/hardening.cfg"
+        fi
+    fi
+fi
 
 # If --allow-service-list is specified, don't run anything, just list the supported services
 if [ "$ALLOW_SERVICE_LIST" = 1 ]; then

bin/hardening/5.1.2_crontab_perm_ownership.sh

@@ -24,6 +24,10 @@ GROUP='root'
 
 # This function will be called if the script status is on enabled / audit mode
 audit() {
+    does_file_exist "$FILE"
+    if [ "$FNRET" != 0 ]; then
+        crit "$FILE does not exist"
+    fi
     has_file_correct_ownership "$FILE" "$USER" "$GROUP"
     if [ "$FNRET" = 0 ]; then
         ok "$FILE has correct ownership"

bin/hardening/5.1.3_cron_hourly_perm_ownership.sh

@@ -24,6 +24,10 @@ GROUP='root'
 
 # This function will be called if the script status is on enabled / audit mode
 audit() {
+    does_file_exist "$FILE"
+    if [ "$FNRET" != 0 ]; then
+        crit "$FILE does not exist"
+    fi
     has_file_correct_ownership "$FILE" "$USER" "$GROUP"
     if [ "$FNRET" = 0 ]; then
         ok "$FILE has correct ownership"

bin/hardening/5.1.4_cron_daily_perm_ownership.sh

@@ -24,6 +24,10 @@ GROUP='root'
 
 # This function will be called if the script status is on enabled / audit mode
 audit() {
+    does_file_exist "$FILE"
+    if [ "$FNRET" != 0 ]; then
+        crit "$FILE does not exist"
+    fi
     has_file_correct_ownership "$FILE" "$USER" "$GROUP"
     if [ "$FNRET" = 0 ]; then
         ok "$FILE has correct ownership"

bin/hardening/5.1.5_cron_weekly_perm_ownership.sh

@@ -24,6 +24,10 @@ GROUP='root'
 
 # This function will be called if the script status is on enabled / audit mode
 audit() {
+    does_file_exist "$FILE"
+    if [ "$FNRET" != 0 ]; then
+        crit "$FILE does not exist"
+    fi
     has_file_correct_ownership "$FILE" "$USER" "$GROUP"
     if [ "$FNRET" = 0 ]; then
         ok "$FILE has correct ownership"

bin/hardening/5.1.6_cron_monthly_perm_ownership.sh

@@ -24,6 +24,10 @@ GROUP='root'
 
 # This function will be called if the script status is on enabled / audit mode
 audit() {
+    does_file_exist "$FILE"
+    if [ "$FNRET" != 0 ]; then
+        crit "$FILE does not exist"
+    fi
     has_file_correct_ownership "$FILE" "$USER" "$GROUP"
     if [ "$FNRET" = 0 ]; then
         ok "$FILE has correct ownership"

bin/hardening/5.2.15_ssh_cry_kex.sh

@@ -73,15 +73,12 @@ apply() {
 }
 
 create_config() {
-    get_debian_major_version
     set +u
     debug "Debian version : $DEB_MAJ_VER "
-    if [[ -z "$DEB_MAJ_VER" ]] || [[ 7 -eq "$DEB_MAJ_VER" ]]; then
+    if [[ 7 -le "$DEB_MAJ_VER" ]]; then
         KEX='diffie-hellman-group-exchange-sha256'
-    elif [[ 8 -eq "$DEB_MAJ_VER" ]] || [[ 9 -eq "$DEB_MAJ_VER" ]]; then
-        KEX='curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256'
     else
-        KEX='diffie-hellman-group-exchange-sha256'
+        KEX='curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256'
     fi
     set -u
     cat <<EOF
@@ -89,6 +86,7 @@ status=audit
 # Put your KexAlgorithms
 OPTIONS="KexAlgorithms=$KEX"
 EOF
+
 }
 
 # This function will check config parameters required

bin/hardening/99.5.2.2_ssh_cry_rekey.sh

@@ -24,15 +24,14 @@ FILE='/etc/ssh/sshd_config'
 
 # This function will be called if the script status is on enabled / audit mode
 audit() {
-    get_debian_major_version
     set +u
     debug "Debian version : $DEB_MAJ_VER "
-    if [[ -z $DEB_MAJ_VER ]]; then
+    if [[ -z "$DEB_MAJ_VER" ]]; then
         set -u
         crit "Cannot get Debian version. Aborting..."
         return
     fi
-    if [[ "${DEB_MAJ_VER}" -lt "8" ]]; then
+    if [[ "${DEB_MAJ_VER}" != "sid" ]] && [[ "${DEB_MAJ_VER}" -lt "8" ]]; then
         set -u
         warn "Debian version too old (${DEB_MAJ_VER}), check does not apply, you should disable this check."
         return

bin/hardening/99.99_check_distribution.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+
+# run-shellcheck
+#
+# OVH Security audit
+#
+
+#
+# 99.99 Ensure that the distribution version is debian and that the version is 9 or 10
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+# shellcheck disable=2034
+HARDENING_LEVEL=1
+# shellcheck disable=2034
+DESCRIPTION="Check the distribution and the distribution version"
+
+# This function will be called if the script status is on enabled / audit mode
+audit() {
+    if [ "$DISTRIBUTION" != "debian" ]; then
+        crit "Your distribution has been identified as $DISTRIBUTION which is not debian"
+    else
+        if [ "$DEB_MAJ_VER" = "sid" ] || [ "$DEB_MAJ_VER" -gt "$HIGHEST_SUPPORTED_DEBIAN_VERSION" ]; then
+            crit "Your distribution is too recent and is not yet supported."
+        elif [ "$DEB_MAJ_VER" -lt "$SMALLEST_SUPPORTED_DEBIAN_VERSION" ]; then
+            crit "Your distribution is debian but is deprecated. Consider upgrading to a supported version."
+        else
+            ok "Your distribution is debian and the version is supported"
+
+        fi
+    fi
+}
+
+# This function will be called if the script status is on enabled mode
+apply() {
+    echo "Reporting only here, upgrade your debian version to a supported version if you're on debian"
+    echo "If you use another distribution, consider applying rules corresponding with your distribution available at https://www.cisecurity.org/"
+}
+
+# This function will check config parameters required
+check_config() {
+    :
+}
+
+# Source Root Dir Parameter
+if [ -r /etc/default/cis-hardening ]; then
+    # shellcheck source=../../debian/default
+    . /etc/default/cis-hardening
+fi
+if [ -z "$CIS_ROOT_DIR" ]; then
+    echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
+    echo "Cannot source CIS_ROOT_DIR variable, aborting."
+    exit 128
+fi
+
+# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
+if [ -r "$CIS_ROOT_DIR"/lib/main.sh ]; then
+    # shellcheck source=../../lib/main.sh
+    . "$CIS_ROOT_DIR"/lib/main.sh
+else
+    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
+    exit 128
+fi

debian/cis-hardening.8

@@ -136,6 +136,12 @@ Default value is : info
 While performing system audit, this option sets LOGLEVEL to `ok' and
 captures all output to print only one line once the check is done,
 formatted like : OK|KO OK|KO|WARN{subcheck results} [OK|KO|WARN{\&...}]
+.PP
+\f[C]--allow-unsupported-distribution\f[R] Must be specified manually in
+the command line to allow the run on non compatible version or
+distribution.
+If you want to mute the warning change the LOGLEVEL in
+/etc/hardening.cfg
 .SH AUTHORS
 .IP \[bu] 2
 Thibault Dewailly, OVHcloud <thibault.dewailly@ovhcloud.com>

lib/common.sh

@@ -113,31 +113,6 @@ sudo_wrapper() {
     fi
 }
 
-#
-# detect if container based on cgroup detection
-#
-is_running_in_container() {
-    awk -F/ '$2 == "'"$1"'"' /proc/self/cgroup
-}
-
-CONTAINER_TYPE=""
-IS_CONTAINER=0
-
-if [ "$(is_running_in_container "docker")" != "" ]; then
-    CONTAINER_TYPE="docker"
-    IS_CONTAINER=1
-fi
-if [ "$(is_running_in_container "lxc")" != "" ]; then
-    CONTAINER_TYPE="lxc"
-    IS_CONTAINER=1
-fi
-if [ "$(is_running_in_container "kubepods")" != "" ]; then
-    # shellcheck disable=SC2034
-    CONTAINER_TYPE="kubepods"
-    # shellcheck disable=SC2034
-    IS_CONTAINER=1
-fi
-
 #
 # Math functions
 #

lib/constants.sh

@@ -31,3 +31,32 @@ BGREEN='\033[1;32m' # Green
 BYELLOW='\033[1;33m' # Yellow
 # shellcheck disable=2034
 BWHITE='\033[1;37m' # White
+
+# Debian version variables
+
+CONTAINER_TYPE=""
+IS_CONTAINER=0
+
+if [ "$(is_running_in_container "docker")" != "" ]; then
+    CONTAINER_TYPE="docker"
+    IS_CONTAINER=1
+fi
+if [ "$(is_running_in_container "lxc")" != "" ]; then
+    CONTAINER_TYPE="lxc"
+    IS_CONTAINER=1
+fi
+if [ "$(is_running_in_container "kubepods")" != "" ]; then
+    # shellcheck disable=SC2034
+    CONTAINER_TYPE="kubepods"
+    # shellcheck disable=SC2034
+    IS_CONTAINER=1
+fi
+
+get_distribution
+
+get_debian_major_version
+
+# shellcheck disable=SC2034
+SMALLEST_SUPPORTED_DEBIAN_VERSION=9
+# shellcheck disable=SC2034
+HIGHEST_SUPPORTED_DEBIAN_VERSION=10

lib/main.sh

@@ -10,14 +10,15 @@ BATCH_OUTPUT=""
 status=""
 forcedstatus=""
 SUDO_CMD=""
-# shellcheck source=constants.sh
-[ -r "$CIS_ROOT_DIR"/lib/constants.sh ] && . "$CIS_ROOT_DIR"/lib/constants.sh
+
 # shellcheck source=../etc/hardening.cfg
 [ -r "$CIS_ROOT_DIR"/etc/hardening.cfg ] && . "$CIS_ROOT_DIR"/etc/hardening.cfg
 # shellcheck source=../lib/common.sh
 [ -r "$CIS_ROOT_DIR"/lib/common.sh ] && . "$CIS_ROOT_DIR"/lib/common.sh
 # shellcheck source=../lib/utils.sh
 [ -r "$CIS_ROOT_DIR"/lib/utils.sh ] && . "$CIS_ROOT_DIR"/lib/utils.sh
+# shellcheck source=constants.sh
+[ -r "$CIS_ROOT_DIR"/lib/constants.sh ] && . "$CIS_ROOT_DIR"/lib/constants.sh
 
 # Environment Sanitizing
 export PATH='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'

lib/utils.sh

@@ -538,9 +538,33 @@ get_debian_major_version() {
     DEB_MAJ_VER=""
     does_file_exist /etc/debian_version
     if [ "$FNRET" = 0 ]; then
-        DEB_MAJ_VER=$(cut -d '.' -f1 /etc/debian_version)
+        if grep -q "sid" /etc/debian_version; then
+            DEB_MAJ_VER="sid"
+        else
+            DEB_MAJ_VER=$(cut -d '.' -f1 /etc/debian_version)
+        fi
     else
         # shellcheck disable=2034
         DEB_MAJ_VER=$(lsb_release -r | cut -f2 | cut -d '.' -f 1)
     fi
 }
+
+# Returns the distribution
+
+get_distribution() {
+    DISTRIBUTION=""
+    if [ -f /etc/os-release ]; then
+        # shellcheck disable=2034
+        DISTRIBUTION=$(grep "^ID=" /etc/os-release | sed 's/ID=//' | tr '[:upper:]' '[:lower:]')
+        FNRET=0
+    else
+        debug "Distribution not found !"
+        FNRET=127
+    fi
+}
+
+# Detect if container based on cgroup detection
+
+is_running_in_container() {
+    awk -F/ '$2 == "'"$1"'"' /proc/self/cgroup
+}

tests/docker/Dockerfile.debian11

@@ -0,0 +1,21 @@
+FROM debian:bullseye
+
+LABEL vendor="OVH"
+LABEL project="debian-cis"
+LABEL url="https://github.com/ovh/debian-cis"
+LABEL description="This image is used to run tests"
+
+RUN groupadd -g 500 secaudit && useradd  -u 500 -g 500 -s /bin/bash secaudit && install -m 700 -o secaudit -g secaudit -d /home/secaudit
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y openssh-server sudo syslog-ng net-tools auditd cron
+
+COPY --chown=500:500 . /opt/debian-cis/
+
+COPY debian/default /etc/default/cis-hardening
+RUN sed -i 's#cis-hardening#debian-cis#' /etc/default/cis-hardening
+
+COPY cisharden.sudoers /etc/sudoers.d/secaudit
+RUN sed -i 's#cisharden#secaudit#' /etc/sudoers.d/secaudit
+
+
+ENTRYPOINT ["/opt/debian-cis/tests/launch_tests.sh"]

tests/hardening/5.1.2_crontab_perm_ownership.sh

@@ -10,6 +10,8 @@ test_audit() {
     local test_user="testcrontabduser"
     local test_file="/etc/crontab"
 
+    touch "$test_file"
+
     describe Tests purposely failing
     chmod 777 "$test_file"
     register_test retvalshouldbe 1

tests/hardening/5.1.3_cron_hourly_perm_ownership.sh

@@ -10,6 +10,8 @@ test_audit() {
     local test_user="testcrontabuser"
     local test_file="/etc/cron.hourly"
 
+    touch "$test_file"
+
     describe Tests purposely failing
     chmod 777 "$test_file"
     register_test retvalshouldbe 1

tests/hardening/5.1.4_cron_daily_perm_ownership.sh

@@ -10,6 +10,8 @@ test_audit() {
     local test_user="testcrontabuser"
     local test_file="/etc/cron.daily"
 
+    touch "$test_file"
+
     describe Tests purposely failing
     chmod 777 "$test_file"
     register_test retvalshouldbe 1

tests/hardening/5.1.5_cron_weekly_perm_ownership.sh

@@ -10,6 +10,8 @@ test_audit() {
     local test_user="testcrontabuser"
     local test_file="/etc/cron.weekly"
 
+    touch "$test_file"
+
     describe Tests purposely failing
     chmod 777 "$test_file"
     register_test retvalshouldbe 1

tests/hardening/5.1.6_cron_monthly_perm_ownership.sh

@@ -10,6 +10,8 @@ test_audit() {
     local test_user="testcrontabuser"
     local test_file="/etc/cron.monthly"
 
+    touch "$test_file"
+
     describe Tests purposely failing
     chmod 777 "$test_file"
     register_test retvalshouldbe 1

tests/hardening/99.99_check_distribution.sh

@@ -0,0 +1,16 @@
+# shellcheck shell=bash
+# run-shellcheck
+test_audit() {
+    describe Running on blank host
+    register_test retvalshouldbe 0
+    dismiss_count_for_test
+    # shellcheck disable=2154
+    run blank /opt/debian-cis/bin/hardening/"${script}".sh --audit-all
+
+    ##################################################################
+    # For this test, we only check that it runs properly on a blank  #
+    # host, and we check root/sudo consistency. But, we don't test   #
+    # the apply function because it can't be automated or it is very #
+    # long to test and not very useful.                              #
+    ##################################################################
+}