Configure Trust List in RHEL 9: A Comprehensive Guide
In this article, we will provide a detailed guide on configuring the trust list in RHEL 9. The trust list is an essential part of any Linux system, as it contains the list of Certificate Authorities (CAs) that the system considers trustworthy. By default, RHEL provides a pre-populated trust list that the system uses to verify SSL connections and other security-related activities. However, there might be situations where you need to modify this list according to your organization's policies.
Understanding the Trust List
The trust list is stored in the /etc/pki/ca-trust/source/anchors/ directory as a collection of CA certificates. These certificates are used to verify the identity of other parties involved in SSL connections. When a client initiates an SSL connection, it sends a request to the server for its certificate. The server sends back its certificate, and the client verifies it against the trust list.
If the server's certificate is not present in the trust list, the client will reject the SSL connection. Therefore, it is essential to ensure that the trust list contains all the necessary CA certificates required for your system.
Adding a New CA Certificate
Adding a new CA certificate involves importing the certificate into the trust list. To do this, follow the steps below:
- Download the CA certificate that you want to add. You can download it from the CA's website or request it from the CA directly.
- Copy the certificate to the
/etc/pki/ca-trust/source/anchors/directory. - Run the command
update-ca-trustto update the trust list.
# wget -P /mnt/sysimage/etc/pki/ca-trust/source/anchors/ http://.../ca-cert.crt
# update-ca-trust
Removing a CA Certificate
Removing a CA certificate involves deleting the certificate from the trust list. To do this, follow the steps below:
- Delete the CA certificate from the
/etc/pki/ca-trust/source/anchors/directory. - Run the command
update-ca-trustto update the trust list.
# rm /etc/pki/ca-trust/source/anchors/ca-cert.crt
# update-ca-trust
- The trust list is an essential part of any Linux system, as it contains the list of Certificate Authorities (CAs) that the system considers trustworthy.
- The trust list is stored in the
/etc/pki/ca-trust/source/anchors/directory. - Adding a new CA certificate involves importing it into the trust list.
- Removing a CA certificate involves deleting it from the trust list.