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File apache2-ssl-global.conf of Package Apache2

##
##  SSL Global Context
##
##  All SSL configuration in this context applies both to
##  the main server and all SSL-enabled virtual hosts.
##

# These are the configuration directives to instruct the server how to
# serve pages over an https connection. For detailing information about these
# directives see <URL:http:///httpd.apache.org/docs/2.4/mod/mod_ssl.html>
#
# Do NOT simply read the instructions in here without understanding
# what they do.  They're here only as hints or reminders.  If you are unsure
# consult the online docs. You have been warned.

# This global SSL configuration is ignored if 
# "SSL" is not defined, or if "NOSSL" is defined.
<IfDefine SSL>
<IfDefine !NOSSL>
<IfModule mod_ssl.c>

	#
	#   Some MIME-types for downloading Certificates and CRLs
	#
	AddType application/x-x509-ca-cert .crt
	AddType application/x-pkcs7-crl    .crl



        #   SSL Cipher Suite:
        #   List the ciphers that the client is permitted to negotiate.
        #   See the mod_ssl documentation for a complete list.
        # 
        SSLCipherSuite 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

	#   SSLHonorCipherOrder
	#   If SSLHonorCipherOrder is disabled, then the client's preferences
	#   for chosing the cipher during the TLS handshake are used.
	#   If set to on, then the above SSLCipherSuite is used, in the order
	#   given, with the first supported match on both ends.
	SSLHonorCipherOrder on


	#   Pass Phrase Dialog:
	#   Configure the pass phrase gathering process.
	#   The filtering dialog program (`builtin' is a internal
	#   terminal dialog) has to provide the pass phrase on stdout.
	<IfDefine SYSTEMD>
	SSLPassPhraseDialog exec:/usr/sbin/apache2-systemd-ask-pass
	</IfDefine>
	<IfDefine !SYSTEMD>
	SSLPassPhraseDialog  builtin
	</IfDefine>

	#   Inter-Process Session Cache:
	#   Configure the SSL Session Cache: First the mechanism 
	#   to use and second the expiring timeout (in seconds).
	#   shm means the same as shmht. 
	#   Note that on most platforms shared memory segments are not allowed to be on 
	#   network-mounted drives, so in that case you need to use the dbm method.
	#SSLSessionCache        none

	#<IfModule socache_dbm>
	#SSLSessionCache         dbm:/var/lib/apache2/ssl_scache
	#</IfModule>

	<IfModule socache_shmcb>	
	SSLSessionCache         shmcb:/var/lib/apache2/ssl_scache(512000)
	</IfModule>
	SSLSessionCacheTimeout  300


	#   Pseudo Random Number Generator (PRNG):
	#   Configure one or more sources to seed the PRNG of the 
	#   SSL library. The seed data should be of good random quality.
	#   WARNING! On some platforms /dev/random blocks if not enough entropy
	#   is available. This means you then cannot use the /dev/random device
	#   because it would lead to very long connection times (as long as
	#   it requires to make more entropy available). But usually those
	#   platforms additionally provide a /dev/urandom device which doesn't
	#   block. So, if available, use this one instead. Read the mod_ssl User
	#   Manual for more details.
	SSLRandomSeed startup builtin
	SSLRandomSeed connect builtin
	#SSLRandomSeed startup file:/dev/random  512
	#SSLRandomSeed connect file:/dev/random  512
	#SSLRandomSeed startup file:/dev/urandom 512
	#SSLRandomSeed connect file:/dev/urandom 512

</IfModule>
</IfDefine>
</IfDefine>