7.3.1_disable_ipv6_router_advertisement.sh

bin/hardening/7.3.1_disable_ipv6_router_advertisement.sh

@@ -0,0 +1,80 @@
+#!/bin/bash
+
+#
+# CIS Debian 7 Hardening
+# Authors : Thibault Dewailly, OVH <thibault.dewailly@corp.ovh.com>
+#
+
+#
+# 7.3.1 Disable IPv6 Router Advertisements (Not Scored)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+SYSCTL_PARAMS='net.ipv6.conf.all.accept_ra=0 net.ipv6.conf.default.accept_ra=0'
+
+# This function will be called if the script status is on enabled / audit mode
+audit () {
+    does_sysctl_param_exists "net.ipv6"
+    if [ $FNRET != 0 ]; then
+        ok "ipv6 is disabled"
+    else
+        for SYSCTL_VALUES in $SYSCTL_PARAMS; do
+            SYSCTL_PARAM=$(echo $SYSCTL_VALUES | cut -d= -f 1)
+            SYSCTL_EXP_RESULT=$(echo $SYSCTL_VALUES | cut -d= -f 2)
+            debug "$SYSCTL_PARAM must have $SYSCTL_EXP_RESULT"
+            has_sysctl_param_expected_result $SYSCTL_PARAM $SYSCTL_EXP_RESULT
+            if [ $FNRET != 0 ]; then
+                crit "$SYSCTL_PARAM has not $SYSCTL_EXP_RESULT value !"
+            elif [ $FNRET = 255 ]; then
+                warn "$SYSCTL_PARAM does not exist, typo ?"
+            else
+                ok "$SYSCTL_PARAM correctly set to $SYSCTL_EXP_RESULT"
+            fi
+        done
+    fi
+}
+
+# This function will be called if the script status is on enabled mode
+apply () {
+    does_sysctl_param_exists "net.ipv6"
+    if [ $FNRET != 0 ]; then
+        ok "ipv6 is disabled"
+    else
+        for SYSCTL_VALUES in $SYSCTL_PARAMS; do
+            SYSCTL_PARAM=$(echo $SYSCTL_VALUES | cut -d= -f 1)
+            SYSCTL_EXP_RESULT=$(echo $SYSCTL_VALUES | cut -d= -f 2)
+            debug "$SYSCTL_PARAM must have $SYSCTL_EXP_RESULT"
+            has_sysctl_param_expected_result $SYSCTL_PARAM $SYSCTL_EXP_RESULT
+            if [ $FNRET != 0 ]; then
+                warn "$SYSCTL_PARAM has not $SYSCTL_EXP_RESULT value, correcting it"
+                set_sysctl_param $SYSCTL_PARAM $SYSCTL_EXP_RESULT
+                sysctl -w net.ipv4.route.flush=1 > /dev/null
+            elif [ $FNRET = 255 ]; then
+                warn "$SYSCTL_PARAM does not exist, typo ?"
+            else
+                ok "$SYSCTL_PARAM correctly set to $SYSCTL_EXP_RESULT"
+            fi
+        done
+    fi
+}
+
+# This function will check config parameters required
+check_config() {
+    :
+}
+
+# Source Root Dir Parameter
+if [ ! -r /etc/default/cis-hardenning ]; then
+    echo "There is no /etc/default/cis-hardenning file, cannot source CIS_ROOT_DIR variable, aborting"
+    exit 128
+else
+    . /etc/default/cis-hardenning
+    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

etc/conf.d/7.3.1_disable_ipv6_router_advertisement.cfg

@@ -0,0 +1,2 @@
+# Configuration for script of same name
+status=enabled

lib/utils.sh

@@ -1,7 +1,7 @@
 # CIS Debian 7 Hardening Utility functions
 
 #
-# Sysctl Manipulation
+# Sysctl 
 #
 
 has_sysctl_param_expected_result() {
@@ -19,6 +19,16 @@ has_sysctl_param_expected_result() {
     fi
 }
 
+does_sysctl_param_exists() {
+    local SYSCTL_PARAM=$1
+    if [ "$(sysctl -a 2>/dev/null |grep "$SYSCTL_PARAM" -c)" = 0 ]; then
+        FNRET=1
+    else
+        FNRET=0
+    fi
+}
+
+
 set_sysctl_param() {
     local SYSCTL_PARAM=$1
     local VALUE=$2
@@ -35,7 +45,18 @@ set_sysctl_param() {
 }
 
 #
-# Dmesg Manipulation
+# Network
+#
+
+is_ipv6_disabled_by_bootloader() {
+    #if 
+    # 
+    :
+}
+
+
+#
+# Dmesg 
 #
 
 does_pattern_exists_in_dmesg() {
@@ -48,7 +69,7 @@ does_pattern_exists_in_dmesg() {
 }
 
 #
-# File manipulation
+# File 
 #
 
 does_file_exist() {
@@ -130,7 +151,7 @@ replace_in_file() {
 }
 
 #
-# User manipulation
+# Users and groups
 #
 
 does_user_exist() {
@@ -188,7 +209,7 @@ is_kernel_option_enabled() {
 }
 
 #
-# Mounting point manipulation
+# Mounting point 
 #
 
 # Verify $1 is a partition declared in fstab
@@ -263,7 +284,7 @@ remount_partition() {
 }
 
 #
-# APT manipulation
+# APT 
 #
 
 apt_update_if_needed()