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KB-8469: Which ciphers does Centrify Identity Service support?

Centrify Identity Service, App Edition ,  

12 April,17 at 08:55 AM

Applies to: All versions of Centrify Identity Service

Question:

Some clients send requests to Centrify Cloud (e.g. cloud.centrify.com or emea.centrify.com) with SSLv2 to start a handshake.

For example, PolyCom CX600 VOIP Phone would try to communicate with Centrify Cloud after receiving the credentials from Skype for Business, but it would be rejected by Centrify Cloud because the SSLv2 Communication fails with connection reset.

What would be the supported protocol(s) when communicating with Centrify Cloud?

Answer:

SSLv2 is disabled at the machine level for the cloud service due to known attacks against that protocol. Connections of that type are not allowed and there is no workaround for the cloud service. Centrify Identity Service (CIS) supports TLS 1.0, TLS 1.1 and TLS1.2. Below are the supported cipher suites for each protocol:

CIS supports TLS 1.0/TLS 1.1 with the following ciphers in server-preferred order):

  • TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
  • TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
  • TLS_RSA_WITH_AES_256_CBC_SHA
  • TLS_RSA_WITH_AES_128_CBC_SHA

CIS supports TLS1.2 with following ciphers in server-preferred order):
  • TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
  • TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
  • TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
  • TLS_ECDHE_RSA_WITH_AES_128_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_128_CBC_SHA256
  • TLS_RSA_WITH_AES_256_CBC_SHA
  • TLS_RSA_WITH_AES_128_CBC_SHA

Centrify cannot enable the unsupported ciphers on a tenant basis because doing so will introduce risk to the whole cloud service.

One may consider to evaluate Centrify's on-premise cloud product, where SSLv2 can be enabled on the self-hosting server.

Still have questions? Click here to log a technical support case, or collaborate with your peers in Centrify's Online Community.