6장. Creating and managing certificate profiles in Identity Management


Certificate profiles are used by the Certificate Authority (CA) when signing certificates to determine if a certificate signing request (CSR) is acceptable, and if so what features and extensions are present on the certificate. A certificate profile is associated with issuing a particular type of certificate. By combining certificate profiles and CA access control lists (ACLs), you can define and control access to custom certificate profiles.

In describing how to create certificate profiles, the procedures use S/MIME certificates as an example. Some email programs support digitally signed and encrypted email using the Secure Multipurpose Internet Mail Extension (S/MIME) protocol. Using S/MIME to sign or encrypt email messages requires the sender of the message to have an S/MIME certificate.

6.1. What is a certificate profile?

You can use certificate profiles to determine the content of certificates, as well as constraints for issuing the certificates, such as the following:

  • The signing algorithm to use to encipher the certificate signing request.
  • The default validity of the certificate.
  • The revocation reasons that can be used to revoke a certificate.
  • If the common name of the principal is copied to the subject alternative name field.
  • The features and extensions that should be present on the certificate.

A single certificate profile is associated with issuing a particular type of certificate. You can define different certificate profiles for users, services, and hosts in IdM. IdM includes the following certificate profiles by default:

  • caIPAserviceCert
  • IECUserRoles
  • KDCs_PKINIT_Certs (used internally)

In addition, you can create and import custom profiles, which allow you to issue certificates for specific purposes. For example, you can restrict the use of a particular profile to only one user or one group, preventing other users and groups from using that profile to issue a certificate for authentication. To create custom certificate profiles, use the ipa certprofile command.

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