Wednesday, 17 Jul 2024
Technology

Update Splunk.secret Without Breaking Your Production Environment

splunk decrypt password

Why Should You Change Splunk.secret?

Changing your splunk.secret is essential to standardize the encryption key across all Splunk Enterprise hosts in your environment. This is particularly important when deploying password configurations from your Deployment Server. Without using the same splunk.secret across hosts, deploying passwords in plaintext becomes necessary. Although Splunk may encrypt certain passwords in server.conf, passwords.conf files downloaded from the Deployment Server remain unencrypted. To avoid deploying plaintext passwords, deploying encrypted passwords becomes crucial, and this blog post aims to guide you through the process.

In a Search Head cluster, all members must have the same splunk.secret. To prevent any mismatches of previously encrypted stored passwords, it is recommended to change the splunk.secret before converting to a cluster.

By leveraging the same splunk.secret across all of your hosts, you can deploy encrypted passwords, ensure all passwords are stored securely, and decrypt any password in your environment using a single splunk.secret.

Preparing to Change the Splunk.secret

Before making any changes, understanding the scope of the splunk.secret is crucial. It primarily encrypts plaintext passwords stored in configuration files. Thus, changing the splunk.secret renders all currently encrypted passwords nonfunctional with the new encryption key. Therefore, it is essential to have all encrypted passwords in plaintext before changing the splunk.secret.

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The next section will provide a guide on decrypting a password encrypted by the splunk.secret. However, if you already have passwords stored outside of Splunk, you may skip this step. Encrypted passwords are commonly found in passwords.conf (modular inputs), authentication.conf (bindDNpassword for LDAP authentication), and server.conf (pass4SymmKey and sslPassword). Encrypted passwords may also exist in web.conf, inputs.conf, and outputs.conf. Splunk identifies passwords in these files that do not start with ‘$0-9$’ as unencrypted and proceeds to encrypt them.

Three configuration parameters require special attention. First, bindDNpassword in authentication.conf, as an incorrect setting may result in losing access to Splunk if you encounter an LDAP issue after changing the splunk.secret. Second, providing the correct certificate password (‘sslPassword’ parameter in server.conf) is crucial for proper Splunk functionality. Failure to do so may cause the server to be unable to read its own internal server certificate, resulting in GUI and most Splunk commands failing. Third, if the ‘pass4SymmKey’ under the [general] stanza is incorrect, authentication between Splunk services such as license master and its license slaves, cluster members, and deployment server and its deployment clients will fail.

If you are using the default pass4SymmKey and sslPassword, you can remove these lines in /etc/system/local/server.conf. Upon the next restart of Splunk, those two parameters will be regenerated using the default values from etc/system/default/server.conf – ‘changeme’ for pass4SymmKey and ‘password’ for sslPassword. With these considerations in mind, outlining a plan is essential to ensure a smooth change with minimal downtime.

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I recommend following this approach:

1. Create a Document that Lists the Following Components (Per Server):

  • Splunk Server
  • New and Current splunk.secret
  • Encrypted Password
  • Unencrypted Password
  • Password Configuration/Stanza Location

2. Find All of the Information to Fill in this Document

a. Find Encrypted Passwords: