How to modify cipher suites

Introduction

You might want to modify the ciphers used in the SSL exchange in Live Assist's products. To do so you'll need to edit the fas.properties file, make the necessary changes and then restart FAS.

Example 1 - removing ciphers

Here's an example of removing a weak, ephemeral Diffie-Hellman public key 

1. Make a back up of your fas.properties file

cd /opt/cafex/FAS-2.1*/domain/configuration
cp fas.properties fas.bak-<date>

2. Edit fas.properties and remove the weak encryption ciphers

vi  fas.properties and make the following changes to the  jsse cipher suites:

Before:

jsse.cipher.suites=SSL_RSA_WITH_RC4_128_MD5,SSL_RSA_WITH_RC4_128_SHA,SSL_RSA_WITH_3DES_EDE_CBC_SHA,SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA,SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA,TLS_DHE_RSA_WITH_AES_128_CBC_SHA,TLS_DHE_DSS_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA

After:

jsse.cipher.suites=SSL_RSA_WITH_3DES_EDE_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA

3. Restart FAS from the command line

# service fas restart

Example 2 - adding ciphers

Here's an example of adding GCM ciphers ( GCM ciphers are supported only on JDK-8 at the time of writing.)

1. Make a back up of your fas.properties file

cd /opt/cafex/FAS-2.1*/domain/configuration
cp fas.properties fas.bak-<date>

2. Edit fas.properties and add the new encryption ciphers by append  ingto the end the ciphers so that it reads 

openssl.cipher.suites=SSL_RSA_WITH_3DES_EDE_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

3. Restart FAS from the command line

# service fas restart

If you have any queries contact Customer Support