Splunk® Enterprise

Securing Splunk Enterprise

Splunk Enterprise version 8.2 is no longer supported as of September 30, 2023. See the Splunk Software Support Policy for details. For information about upgrading to a supported version, see How to upgrade Splunk Enterprise.
This documentation does not apply to the most recent version of Splunk® Enterprise. For documentation on the most recent version, go to the latest release.

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.

Last modified on 13 June, 2022
Things to know about your certificates   How to prepare signed certificates for inter-Splunk communication

This documentation applies to the following versions of Splunk® Enterprise: 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, 7.0.10, 7.0.11, 7.0.13, 7.1.0, 7.1.1, 7.1.2, 7.1.3, 7.1.4, 7.1.5, 7.1.6, 7.1.7, 7.1.8, 7.1.9, 7.1.10, 7.2.0, 7.2.1, 7.2.2, 7.2.3, 7.2.4, 7.2.5, 7.2.6, 7.2.7, 7.2.8, 7.2.9, 7.2.10, 7.3.0, 7.3.1, 7.3.2, 7.3.3, 7.3.4, 7.3.5, 7.3.6, 7.3.7, 7.3.8, 7.3.9, 8.0.0, 8.0.1, 8.0.2, 8.0.3, 8.0.4, 8.0.5, 8.0.6, 8.0.7, 8.0.8, 8.0.9, 8.0.10, 8.1.0, 8.1.1, 8.1.2, 8.1.3, 8.1.4, 8.1.5, 8.1.6, 8.1.7, 8.1.8, 8.1.9, 8.1.10, 8.1.11, 8.1.12, 8.1.13, 8.1.14, 8.2.0, 8.2.1, 8.2.2, 8.2.3, 8.2.4, 8.2.5, 8.2.6, 8.2.7, 8.2.8, 8.2.9, 8.2.10, 8.2.11, 8.2.12


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