Cryptographic settings

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Encryption Algorithms of the UTM

Last adaptation to the version: 12.1

New:

• Support for TLS 1.3

notempty

This article refers to a Beta version

11.8.2 11.6

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The graph on the right shows the dependency on the settings of an application for Global Setting using the SSL v3 protocol.

Introduction

In this menu you define the encryption protocol that is used to address the applications on the UTM. The basic settings selected by Securepoint are currently considered secure and have been tested for compatibility.
If a higher level of protection is required, the settings can be changed in the → Authentication →Cryptographic settings menu (jargon: harden).

• The tab Global displays the basic settings.
• With Overwrite default values: these values for all applications can be overwritten.
• The default values or
• The changes made in the Global tab can in turn be overwritten separately for each application.
• The settings in the application menus can (partially) apply the global values by selecting Apply value from GLOBAL tab.

The graph on the right shows the dependency on the settings of an application for Global Setting using the SSL v3 protocol.

Cryptographic settings

The settings are made in the menu → Authentication →Cryptographic settings

Global Global
Caption	Value	Description	Global Encryption Settings
Override defaults:	No	If this function is activated, the settings for the protocols can be changed.
TLS min version:	Select TLS version	TLS 1.0 to TLS 1.3 is available Default: 1.2
TLS max version:	Select TLS version	TLS 1.0 to TLS 1.3 is available Default: 1.3
DH Key Size:	2048	The length of the Diffie-Hellmann key can be set to 2048 bit (default) or 4096 bit.
Cipher suite:		In the field Cipher-Suite the desired encryption and modes can be defined.
Webserver Webserver
Override defaults:	No	If this function is activated, the settings for the protocols can be changed.	Encryption settings for web server connections
TLS min version:	Select TLS version	TLS 1.0 to TLS 1.3 is available Default: 1.2
TLS max version:	Select TLS version	TLS 1.0 to TLS 1.3 is available Default: 1.3
DH Key Size:	2048	The length of the Diffie-Hellmann key can be set to 2048 bit (default) or 4096 bit.
ECDH 384 Bit:	On	Uses the Elliptic Curve Diffie-Hellman method with 384 bits for key calculation.
Cipher suite:		In the field Cipher-Suite the desired encryption and modes can be defined. Default: ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS;
SSL-VPN SSL-VPN Gobal control connection settings:
Override defaults:	No	If this function is activated, the settings for the protocols can be changed.	Encryption for SSL-VPN connections
TLS min version:	Select TLS version	TLS 1.0 to TLS 1.3 is available Default: 1.2
TLS min version:	Select TLS version	TLS 1.0 to TLS 1.3 is available Default: 1.3
DH Key Size:	2048	The length of the Diffie-Hellmann key can be set to 2048 bit (default) or 4096 bit.
Cipher suite:		In the field Cipher-Suite the desired encryption and modes can be defined. Default TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384:TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384:TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256:TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256:TLS-DHE-RSA-WITH-AES-256-GCM-SHA384:TLS-DHE-RSA-WITH-AES-128-GCM-SHA256:TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA384:TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA384:TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA:TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA:TLS-DHE-RSA-WITH-AES-256-CBC-SHA256:TLS-DHE-RSA-WITH-AES-256-CBC-SHA:TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA256:TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA256:TLS-ECDHE-RSA-WITH-AES-128-CBC-SHA:TLS-ECDHE-ECDSA-WITH-AES-128-CBC-SHA:TLS-DHE-RSA-WITH-AES-128-CBC-SHA256:TLS-DHE-RSA-WITH-AES-128-CBC-SHA:TLS-ECDHE-RSA-WITH-3DES-EDE-CBC-SHA:TLS-ECDHE-ECDSA-WITH-3DES-EDE-CBC-SHA:TLS-DHE-RSA-WITH-3DES-EDE-CBC-SHA:TLS-RSA-WITH-AES-256-GCM-SHA384:TLS-RSA-WITH-AES-128-GCM-SHA256:TLS-RSA-WITH-AES-256-CBC-SHA256:TLS-RSA-WITH-AES-256-CBC-SHA:TLS-RSA-WITH-AES-128-CBC-SHA256:TLS-RSA-WITH-AES-128-CBC-SHA:TLS-RSA-WITH-3DES-EDE-CBC-SHA
Mailrelay Mailrelay
Override defaults:	No	If this function is activated, the settings for the protocols can be changed.	Encryption settings for connections via the mail relay
TLS min version:	Select TLS version	TLS 1.0 to TLS 1.3 is available Default: 1.2 If TLS is to be forced, the setting is made under → Applications →MailrelayTab Relaying
TLS max version:	Select TLS version	TLS 1.0 to TLS 1.3 is available Default: 1.3
DH Key Size:	2048	The length of the Diffie-Hellmann key can be set to 2048 bit (default) or 4096 bit.
Cipher suite:		In the field Cipher-Suite the desired encryption and modes can be defined. Default ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS
Reverse-Proxy Reverse-Proxy
Override defaults:	No	If this function is activated, the settings for the protocols can be changed.	Encryption for reverse proxy connections
TLS min version:	Select TLS version	TLS 1.0 to TLS 1.3 is available Default: 1.2
TLS max version:	Select TLS version	TLS 1.0 to TLS 1.3 is available Default: 1.3
DH Key Size:	2048	The length of the Diffie-Hellmann key can be set to 2048 bit (default) or 4096 bit.
Cipher suite:		In the field Cipher-Suite the desired encryption and modes can be defined. Default ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS

Save / Restore

The button ⤺ Reset resets the settings in the currently opened area to the global values. If Overwrite default values is deactivated again, the settings in the currently opened area are reset to the default values of the individual application.

Changing the default settings may result in not all target systems being available for all users. For example, if they use older clients or web browsers that do not support the required encryption.

The services are restarted when the new settings are saved.

This results in the web server requiring the administrator and/or user of the UTM web interface to log on again.

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CLI

The settings that are made in the web interface are visible on the Command Line Interface using the following commands.

Global settings

extc value get application "securepoint_firewall"

Das Ergebnis sollte ähnlich wie folgt aussehen:

application         |variable                       |value
--------------------+-------------------------------+----- 
securepoint_firewall|ANONYMIZELOGS                  |1    
                    |CIPHER_LIST                    |     
                    |CLUSTERADVBASE                 |2    
                    |CLUSTERDEADRATIO               |15   
                    |CLUSTERPREEMTIVE               |0    
                    |CLUSTER_ID                     |1    
                    |CLUSTER_SECRET                 |secret
                    |CRYPTO_OVERRIDE                |0    
                    |DHPARAM_LENGTH                 |2048 
                    |DHPARAM_LENGTH_DEFAULT         |2048 
                    |ECDHE_CURVE                    |secp384r1
                    |FULLCONENAT_ZONE_DST           |external
                    |FULLCONENAT_ZONE_SRC           |internal
                    |HTTP_TRANSPARENT_EXCEPTION_LIST|     
                    |HTTP_TRANSPARENT_LIST          |LAN2 
                    |IPCONNTRACK                    |32000
                    |LANG                           |en_US
                    |LASTRULE_LOGGING               |2    
                    |POP3_TRANSPARENT_EXCEPTION_LIST|     
                    |POP3_TRANSPARENT_LIST          |LAN2 
                    |PPPOE_LCP_ECHO                 |1    
                    |TLS_VERSION_MAX                |1.3  
                    |TLS_VERSION_MAX_DEFAULT        |1.3  
                    |TLS_VERSION_MIN                |1.2 
                    |TLS_VERSION_MIN_DEFAULT        |1.2  
                    |UPDATE_TRIGGER_DELAY           |2    
                    |USE_ECDHE                      |1    
                    |USE_OTP                        |0   

Um hier den Wert einer einzelnen Variablen zu ändern, kann folgender Befehl verwendet werden. Geändert wird der Wert der Variablen TLS_VERSION_MIN.

extc value set application "securepoint_firewall" variable "TLS_VERSION_MIN" value 1.1

The result should look similar to the following:

                    |TLS_VERSION_MAX                |1.3  
                    |TLS_VERSION_MAX_DEFAULT        |1.3  
                    |TLS_VERSION_MIN                |1.1  
                    |TLS_VERSION_MIN_DEFAULT        |1.0

Individual applications

The encryption of the individual applications can be done with the same command. Only the name of the application must be exchanged. The following applications are available:

extc value get application "webserver"
extc value get application "openvpn"
extc value get application "smtpd"
extc value get application "squid-reverse"

Changes made on the CLI must be activated by restarting the respective application. The command for this is:

appmgmt restart application "[Name of the application]"