Splunk® Enterprise

Securing Splunk Enterprise

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About cipher suites and TLS encryption

As of version 6.6, Splunk provides the following default cipher suites and TLS encryption. If you are upgrading from a previous version, you must update your existing certificates to be compatible with later versions.

inputs.conf

sslVersions = tls1.2
cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-
SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-
AES128-SHA256:ECDHE-RSA-AES128-SHA256
ecdhCurves = prime256v1, secp384r1, secp521r1

This configuration does not support Splunk 5.x. To add support for Splunk 5.x:

1. Set sslVersions = tls

2. Add the following ciphers to the end of the existing cipherSuite:

DHE-RSA-AES256-SHA:AES256-SHA:DHE-RSA-AES128-SHA:AES128-SHA:
AES256-SHA:AES128-SHA

outputs.conf

sslVersions = tls1.2
cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-
SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-
AES128-SHA256:ECDHE-RSA-AES128-SHA256
ecdhCurves = prime256v1, secp384r1, secp521r1

This configuration does not support Splunk 5.x. To add support for Splunk 5.x:

1. Set sslVersions to tls

2. Add the following ciphers to the end of the existing cipherSuite:

DHE-RSA-AES256-SHA:AES256-SHA:DHE-RSA-AES128-SHA:AES128-SHA:
AES256-SHA:AES128-SHA

server.conf

sslVersions = tls1.2
sslVersionsForClient = tls1.2
cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-
SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-
AES128-SHA256:ECDHE-RSA-AES128-SHA256:AES256-GCM-SHA384:AES128-GCM-SHA256:AES128-SHA256
ecdhCurves = prime256v1, secp384r1, secp521r1

This configuration does not support Splunk 5.x. To add support for Splunk 5.x:

1. Set sslVersions = tls

2. Set sslVersionsForClient = tls

3. Append AES256-SHA to the existing cipherSuite.

applicationsManagement

sslVersions = tls1.2
cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-
SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-
AES128-SHA256:ECDHE-RSA-AES128-SHA256
ecdhCurves = prime256v1, secp384r1, secp521r1

This configuration does not support Splunk 5.x. To add support for Splunk 5.x:

1. Set sslVersions = tls

2. Add the following ciphers to the end of the existing cipherSuite:

DHE-RSA-AES256-SHA:AES256-SHA:DHE-RSA-AES128-SHA:AES128-SHA:
AES256-SHA:AES128-SHA

web.conf

sslVersions = tls1.2
cipherSuite = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-
SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-
AES128-SHA256:ECDHE-RSA-AES128-SHA256
ecdhCurves = prime256v1, secp384r1, secp521r1

This configuration does not support Windows Vista. To add support for Windows Vista:

1. Set sslVersions = tls

2. Add the following ciphers to the existing cipherSuite:

ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES128-SHA:
ECDHE-RSA-AES128-SHA

ldap.conf

TLS_PROTOCOL_MIN: 3.1 for TLSv1.0, 3.2 for TLSv1.1, 3.3 for TLSv1.2.
TLS_PROTOCOL_MIN 3.3
TLS_CIPHER_SUITE ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-
SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-
AES128-SHA256:ECDHE-RSA-AES128-SHA256

This configuration does not support Windows Server 2008 R2. To add support for Windows Server 2008 R2:

1. Set TLS_PROTOCOL_MIN = TLS1.0/SSL3.1

2. Add the following ciphers to the existing TLS_CIPHER_SUITE:

     
ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES128-SHA:
ECDHE-RSA-AES128-SHA

To enable TLS 1.2 support on Windows Server 2008 R2:

1. Add key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\
Protocols\TLS 1.2\Server

2. In the TLS 1.2\Server key, create the following:

DWORD (32-bit) Value – DisabledByDefault; set to 0
DWORD (32-bit) Value – Enabled; set to 1

3. Restart Windows. See: https://technet.microsoft.com/en-us/library/dn786418(v=ws.11).aspx#BKMK_SchannelTR_TLS12 for more information.

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This documentation applies to the following versions of Splunk® Enterprise: 6.6.0, 6.6.1, 6.6.2, 6.6.3, 6.6.4, 6.6.5, 6.6.6, 6.6.7, 6.6.8, 6.6.9, 6.6.10, 6.6.11, 6.6.12, 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.0.4, 7.0.5, 7.0.6, 7.0.7, 7.0.8, 7.0.9, 7.1.0, 7.1.1, 7.1.2, 7.1.3, 7.1.4, 7.1.5, 7.1.6, 7.1.7, 7.2.0, 7.2.1, 7.2.2, 7.2.3, 7.2.4, 7.2.5, 7.2.6


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