From e81778e615209e581e646dc7166ad75d681b0d09 Mon Sep 17 00:00:00 2001
From: "thibault.dewailly" <thibault.dewailly@ovh.net>
Date: Wed, 13 Apr 2016 16:07:16 +0200
Subject: [PATCH] 7.2.5_ignore_broadcast_requests.sh
 7.2.6_enable_bad_error_message_protection.sh
 7.2.7_enable_source_route_validation.sh 7.2.8_enable_tcp_syn_cookies.sh

---
 .../7.2.5_ignore_broadcast_requests.sh        | 70 +++++++++++++++++++
 ...2.6_enable_bad_error_message_protection.sh | 70 +++++++++++++++++++
 .../7.2.7_enable_source_route_validation.sh   | 70 +++++++++++++++++++
 bin/hardening/7.2.8_enable_tcp_syn_cookies.sh | 70 +++++++++++++++++++
 .../7.2.5_ignore_broadcast_requests.cfg       |  2 +
 ....6_enable_bad_error_message_protection.cfg |  2 +
 .../7.2.7_enable_source_route_validation.cfg  |  2 +
 etc/conf.d/7.2.8_enable_tcp_syn_cookies.cfg   |  2 +
 8 files changed, 288 insertions(+)
 create mode 100755 bin/hardening/7.2.5_ignore_broadcast_requests.sh
 create mode 100755 bin/hardening/7.2.6_enable_bad_error_message_protection.sh
 create mode 100755 bin/hardening/7.2.7_enable_source_route_validation.sh
 create mode 100755 bin/hardening/7.2.8_enable_tcp_syn_cookies.sh
 create mode 100644 etc/conf.d/7.2.5_ignore_broadcast_requests.cfg
 create mode 100644 etc/conf.d/7.2.6_enable_bad_error_message_protection.cfg
 create mode 100644 etc/conf.d/7.2.7_enable_source_route_validation.cfg
 create mode 100644 etc/conf.d/7.2.8_enable_tcp_syn_cookies.cfg

diff --git a/bin/hardening/7.2.5_ignore_broadcast_requests.sh b/bin/hardening/7.2.5_ignore_broadcast_requests.sh
new file mode 100755
index 0000000..56475b1
--- /dev/null
+++ b/bin/hardening/7.2.5_ignore_broadcast_requests.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+#
+# CIS Debian 7 Hardening
+# Authors : Thibault Dewailly, OVH <thibault.dewailly@corp.ovh.com>
+#
+
+#
+# 7.2.5 Enable Ignore Broadcast Requests (Scored)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+SYSCTL_PARAMS='net.ipv4.icmp_echo_ignore_broadcasts=1'
+
+# This function will be called if the script status is on enabled / audit mode
+audit () {
+    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
+}
+
+# This function will be called if the script status is on enabled mode
+apply () {
+    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
+}
+
+# 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
diff --git a/bin/hardening/7.2.6_enable_bad_error_message_protection.sh b/bin/hardening/7.2.6_enable_bad_error_message_protection.sh
new file mode 100755
index 0000000..c964383
--- /dev/null
+++ b/bin/hardening/7.2.6_enable_bad_error_message_protection.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+#
+# CIS Debian 7 Hardening
+# Authors : Thibault Dewailly, OVH <thibault.dewailly@corp.ovh.com>
+#
+
+#
+# 7.2.6 Enable Bad Error Message Protection (Scored)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+SYSCTL_PARAMS='net.ipv4.icmp_ignore_bogus_error_responses=1'
+
+# This function will be called if the script status is on enabled / audit mode
+audit () {
+    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
+}
+
+# This function will be called if the script status is on enabled mode
+apply () {
+    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
+}
+
+# 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
diff --git a/bin/hardening/7.2.7_enable_source_route_validation.sh b/bin/hardening/7.2.7_enable_source_route_validation.sh
new file mode 100755
index 0000000..5a7e8d8
--- /dev/null
+++ b/bin/hardening/7.2.7_enable_source_route_validation.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+#
+# CIS Debian 7 Hardening
+# Authors : Thibault Dewailly, OVH <thibault.dewailly@corp.ovh.com>
+#
+
+#
+# 7.2.7 Enable RFC-recommended Source Route Validation (Scored)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+SYSCTL_PARAMS='net.ipv4.conf.all.rp_filter=1 net.ipv4.conf.default.rp_filter=1'
+
+# This function will be called if the script status is on enabled / audit mode
+audit () {
+    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
+}
+
+# This function will be called if the script status is on enabled mode
+apply () {
+    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
+}
+
+# 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
diff --git a/bin/hardening/7.2.8_enable_tcp_syn_cookies.sh b/bin/hardening/7.2.8_enable_tcp_syn_cookies.sh
new file mode 100755
index 0000000..69503fb
--- /dev/null
+++ b/bin/hardening/7.2.8_enable_tcp_syn_cookies.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+#
+# CIS Debian 7 Hardening
+# Authors : Thibault Dewailly, OVH <thibault.dewailly@corp.ovh.com>
+#
+
+#
+# 7.2.8 Enable TCP SYN Cookies (Scored)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+SYSCTL_PARAMS='net.ipv4.tcp_syncookies=1'
+
+# This function will be called if the script status is on enabled / audit mode
+audit () {
+    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
+}
+
+# This function will be called if the script status is on enabled mode
+apply () {
+    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
+}
+
+# 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
diff --git a/etc/conf.d/7.2.5_ignore_broadcast_requests.cfg b/etc/conf.d/7.2.5_ignore_broadcast_requests.cfg
new file mode 100644
index 0000000..e1e4502
--- /dev/null
+++ b/etc/conf.d/7.2.5_ignore_broadcast_requests.cfg
@@ -0,0 +1,2 @@
+# Configuration for script of same name
+status=enabled
diff --git a/etc/conf.d/7.2.6_enable_bad_error_message_protection.cfg b/etc/conf.d/7.2.6_enable_bad_error_message_protection.cfg
new file mode 100644
index 0000000..e1e4502
--- /dev/null
+++ b/etc/conf.d/7.2.6_enable_bad_error_message_protection.cfg
@@ -0,0 +1,2 @@
+# Configuration for script of same name
+status=enabled
diff --git a/etc/conf.d/7.2.7_enable_source_route_validation.cfg b/etc/conf.d/7.2.7_enable_source_route_validation.cfg
new file mode 100644
index 0000000..e1e4502
--- /dev/null
+++ b/etc/conf.d/7.2.7_enable_source_route_validation.cfg
@@ -0,0 +1,2 @@
+# Configuration for script of same name
+status=enabled
diff --git a/etc/conf.d/7.2.8_enable_tcp_syn_cookies.cfg b/etc/conf.d/7.2.8_enable_tcp_syn_cookies.cfg
new file mode 100644
index 0000000..e1e4502
--- /dev/null
+++ b/etc/conf.d/7.2.8_enable_tcp_syn_cookies.cfg
@@ -0,0 +1,2 @@
+# Configuration for script of same name
+status=enabled