From 26c119c4a1554eb108a0485f3299ac8de3e4441f Mon Sep 17 00:00:00 2001
From: Thibault Ayanides <thibault.ayanides@ovhcloud.com>
Date: Fri, 30 Oct 2020 16:09:25 +0100
Subject: [PATCH] ADD(3.2.7): add check mysteriously deleted during renaming

---
 .../3.2.7_enable_source_route_validation.sh   | 76 +++++++++++++++++++
 .../3.2.7_enable_source_route_validation.sh   | 10 +++
 2 files changed, 86 insertions(+)
 create mode 100755 bin/hardening/3.2.7_enable_source_route_validation.sh
 create mode 100755 tests/hardening/3.2.7_enable_source_route_validation.sh

diff --git a/bin/hardening/3.2.7_enable_source_route_validation.sh b/bin/hardening/3.2.7_enable_source_route_validation.sh
new file mode 100755
index 0000000..fbd41e1
--- /dev/null
+++ b/bin/hardening/3.2.7_enable_source_route_validation.sh
@@ -0,0 +1,76 @@
+#!/bin/bash
+
+#
+# CIS Debian Hardening
+#
+
+#
+# 3.2.7 Ensure Reverse Path Filtering is enabled (Scored)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+HARDENING_LEVEL=2
+DESCRIPTION="Enable RFC-recommended source route validation."
+
+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 should be set to $SYSCTL_EXP_RESULT"
+        has_sysctl_param_expected_result $SYSCTL_PARAM $SYSCTL_EXP_RESULT
+        if [ $FNRET != 0 ]; then
+            crit "$SYSCTL_PARAM was not set to $SYSCTL_EXP_RESULT"
+        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 should be set to $SYSCTL_EXP_RESULT"
+        has_sysctl_param_expected_result $SYSCTL_PARAM $SYSCTL_EXP_RESULT
+        if [ $FNRET != 0 ]; then
+            warn "$SYSCTL_PARAM was not set to $SYSCTL_EXP_RESULT -- Fixing"
+            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 $SYSCTL_EXP_RESULT"
+        fi
+    done
+}
+
+# This function will check config parameters required
+check_config() {
+    :
+}
+
+# Source Root Dir Parameter
+if [ -r /etc/default/cis-hardening ]; then
+    . /etc/default/cis-hardening
+fi
+if [ -z "$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
+    . $CIS_ROOT_DIR/lib/main.sh
+else
+    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
+    exit 128
+fi
diff --git a/tests/hardening/3.2.7_enable_source_route_validation.sh b/tests/hardening/3.2.7_enable_source_route_validation.sh
new file mode 100755
index 0000000..b333419
--- /dev/null
+++ b/tests/hardening/3.2.7_enable_source_route_validation.sh
@@ -0,0 +1,10 @@
+# run-shellcheck
+test_audit() {
+    describe Running on blank host
+    register_test retvalshouldbe 0
+    dismiss_count_for_test
+    # shellcheck disable=2154
+    run blank /opt/debian-cis/bin/hardening/"${script}".sh --audit-all
+
+    # TODO fill comprehensive tests
+}