Add audit and apply methods for 9.3.27: Ensure SSH access is limited.

bin/hardening/9.3.26_sshd_logingracetime.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 #
-# harbian audit 7/8/9  Hardening
+# harbian audit 9 Hardening
 #
 
 #

bin/hardening/9.3.27_sshd_ssh_access_limit.sh

@@ -0,0 +1,116 @@
+#!/bin/bash
+
+#
+# harbian audit 9 Hardening
+#
+
+#
+# 9.3.27 Ensure SSH access is limited (Scored)
+# Auther: Samson-W (sccxboy@gmail.com)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+HARDENING_LEVEL=3
+
+PACKAGE='openssh-server'
+FILE='/etc/ssh/sshd_config'
+ALLOWUSER='AllowUsers[[:space:]]*\*'
+ALLOWGROUP='AllowGroups[[:space:]]*\*'
+DENYUSER='DenyUsers[[:space:]]*nobody'
+DENYGROUP='DenyGroups[[:space:]]*nobody'
+
+ALLOWUSER_RET=1
+ALLOWGROUP_RET=1
+DENYUSER_RET=1
+DENYGROUP_RET=1
+
+# This function will be called if the script status is on enabled / audit mode
+audit () {
+    is_pkg_installed $PACKAGE
+    if [ $FNRET != 0 ]; then
+        crit "$PACKAGE is not installed!"
+    else
+        ok "$PACKAGE is installed"
+		if [ $(sshd -T  | grep -ic $ALLOWUSER) -eq 1 ]; then 
+			crit "AllowUsers is not set!"
+		else
+			ok "AllowUsers has set limit."
+			ALLOWUSER_RET=0
+		fi
+
+		if [ $(sshd -T  | grep -ic $ALLOWGROUP) -eq 1 ]; then 
+			crit "AllowGroups is not set!"
+		else
+			ok "AllowGroups has set limit."
+			ALLOWGROUP_RET=0
+		fi
+		if [ $(sshd -T  | grep -ic $DENYUSER) -eq 1 ]; then 
+			crit "DenyUsers is not set!"
+		else
+			ok "DenyUsers has set limit."
+			DENYUSER_RET=0
+		fi
+		if [ $(sshd -T  | grep -ic $DENYGROUP) -eq 1 ]; then 
+			crit "DenyGroups is not set!"
+		else
+			ok "DenyGroups has set limit."
+			DENYGROUP_RET=0
+		fi
+	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
+	if [ $ALLOWUSER_RET -eq 1 ]; then
+		warn "AllowUsers is not set! Need manual operation set it."
+	else
+		ok "AllowUsers has set limit."
+	fi
+	if [ $ALLOWGROUP_RET -eq 1 ]; then
+		warn "AllowGroups is not set! Need manual operation set it."
+	else
+		ok "AllowGroups has set limit."
+	fi
+	if [ $DENYUSER_RET -eq 1 ]; then
+		warn "DenyUsers is not set! Need manual operation set it."
+	else
+		ok "DenyUsers has set limit."
+	fi
+	if [ $DENYGROUP_RET -eq 1 ]; then
+		warn "DenyGroups is not set! Need manual operation set it."
+	else
+		ok "DenyGroups has set limit."
+	fi
+}
+
+# This function will check config parameters required
+check_config() {
+	:
+}
+
+# Source Root Dir Parameter
+if [ -r /etc/default/cis-hardening ]; then
+    . /etc/default/cis-hardening
+fi
+if [ -z "$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