enh: remove ssh system sandbox check (#213)

UsePrivilegeSeparation option is deprecated.
Since the oldest supported Debian distribution is Buster (10), we can safely remove this check

Fixes #212

bin/hardening/99.5.2.8_ssh_sys_sandbox.sh

@@ -1,98 +0,0 @@
-#!/bin/bash
-
-# run-shellcheck
-#
-# Legacy CIS Debian Hardening
-#
-
-#
-# 99.5.2.8 Check UsePrivilegeSeparation set to sandbox.
-#
-
-set -e # One error, it's over
-set -u # One variable unset, it's over
-
-# shellcheck disable=2034
-HARDENING_LEVEL=2
-# shellcheck disable=2034
-DESCRIPTION="Check UsePrivilegeSeparation set to sandbox."
-
-PACKAGE='openssh-server'
-OPTIONS='UsePrivilegeSeparation=sandbox'
-FILE='/etc/ssh/sshd_config'
-
-# This function will be called if the script status is on enabled / audit mode
-audit() {
-    is_pkg_installed "$PACKAGE"
-    if [ "$FNRET" != 0 ]; then
-        ok "$PACKAGE is not installed!"
-    else
-        ok "$PACKAGE is installed"
-        for SSH_OPTION in $OPTIONS; do
-            SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
-            SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
-            PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
-            does_pattern_exist_in_file_nocase "$FILE" "$PATTERN"
-            if [ "$FNRET" = 0 ]; then
-                ok "$PATTERN is present in $FILE"
-            else
-                crit "$PATTERN is not present in $FILE"
-            fi
-        done
-    fi
-}
-
-# This function will be called if the script status is on enabled mode
-apply() {
-    is_pkg_installed "$PACKAGE"
-    if [ "$FNRET" = 0 ]; then
-        ok "$PACKAGE is installed"
-    else
-        crit "$PACKAGE is absent, installing it"
-        apt_install "$PACKAGE"
-    fi
-    for SSH_OPTION in $OPTIONS; do
-        SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
-        SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
-        PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
-        does_pattern_exist_in_file_nocase "$FILE" "$PATTERN"
-        if [ "$FNRET" = 0 ]; then
-            ok "$PATTERN is present in $FILE"
-        else
-            warn "$PATTERN is not present in $FILE, adding it"
-            does_pattern_exist_in_file_nocase "$FILE" "^${SSH_PARAM}"
-            if [ "$FNRET" != 0 ]; then
-                add_end_of_file "$FILE" "$SSH_PARAM $SSH_VALUE"
-            else
-                info "Parameter $SSH_PARAM is present but with the wrong value -- Fixing"
-                replace_in_file "$FILE" "^${SSH_PARAM}[[:space:]]*.*" "$SSH_PARAM $SSH_VALUE"
-            fi
-            /etc/init.d/ssh reload >/dev/null 2>&1
-        fi
-    done
-}
-
-# This function will check config parameters required
-check_config() {
-    :
-}
-
-# Source Root Dir Parameter
-if [ -r /etc/default/cis-hardening ]; then
-    # shellcheck source=../../debian/default
-    . /etc/default/cis-hardening
-fi
-if [ -z "$CIS_LIB_DIR" ]; then
-    echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
-    echo "Cannot source CIS_LIB_DIR variable, aborting."
-    exit 128
-fi
-
-# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
-if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
-    # shellcheck source=../../lib/main.sh
-    . "${CIS_LIB_DIR}"/main.sh
-else
-    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
-    exit 128
-fi

tests/hardening/99.5.2.8_ssh_sys_sandbox.sh

@@ -1,22 +0,0 @@
-# shellcheck shell=bash
-# run-shellcheck
-test_audit() {
-    describe Running on blank host
-    register_test retvalshouldbe 1
-    register_test contain "openssh-server is installed"
-    # shellcheck disable=2154
-    run blank "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
-
-    describe Correcting situation
-    # `apply` performs a service reload after each change in the config file
-    # the service needs to be started for the reload to succeed
-    service ssh start
-    # if the audit script provides "apply" option, enable and run it
-    sed -i 's/audit/enabled/' "${CIS_CONF_DIR}/conf.d/${script}.cfg"
-    "${CIS_CHECKS_DIR}/${script}.sh" || true
-
-    describe Checking resolved state
-    register_test retvalshouldbe 0
-    register_test contain "[ OK ] ^UsePrivilegeSeparation[[:space:]]*sandbox is present in /etc/ssh/sshd_config"
-    run resolved "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
-}