红帽全球峰会第 18 章 Managing externally-signed CA certificates
Identity Management (IdM) provides different types of certificate authority (CA) configurations. You can choose to install IdM with an integrated CA or with an external CA. You must specify the type of CA you are using during the installation. However, once installed you can move from an externally-signed CA to a self-signed CA and vice versa. Additionally, while a self-signed CA is automatically renewed, you must ensure that you renew your externally-signed CA certificate. Refer to the relevant sections as required to manage your externally-signed CA certificates.
Installing IdM with an externally-signed CA:
- Switching from an externally-signed CA to a self-signed CA.
- Switching from a self-signed CA to an externally-signed CA.
- Renewing the externally-signed CA certificate.
Complete this procedure to switch from an externally-signed to a self-signed certificate of the Identity Management (IdM) certificate authority (CA). With a self-signed CA, the renewal of the CA certificate is managed automatically: a system administrator does not need to submit a certificate signing request (CSR) to an external authority.
Switching from an externally-signed to a self-signed CA replaces only the CA certificate. The certificates signed by the previous CA are still valid and still in use. For example, the certificate chain for the LDAP certificate remains unchanged even after you have moved to a self-signed CA:
external_CA certificate > IdM CA certificate > LDAP certificatePrerequisites
-
You have
rootaccess to the IdM CA renewal server and all IdM clients and servers.
Procedure
On the IdM CA renewal server, renew the CA certificate as self-signed:
# ipa-cacert-manage renew --self-signed Renewing CA certificate, please wait CA certificate successfully renewed The ipa-cacert-manage command was successfulSSHto all the remaining IdM servers and clients asroot. For example:# ssh root@idmclient01.idm.example.comOn the IdM client, update the local IdM certificate databases with the certificates from the server:
[idmclient01 ~]# ipa-certupdate Systemwide CA database updated. Systemwide CA database updated. The ipa-certupdate command was successful
Verification
To check if your update has been successful and the new CA certificate has been added to the
/etc/ipa/ca.crtfile:[idmclient01 ~]$ openssl crl2pkcs7 -nocrl -certfile /etc/ipa/ca.crt | openssl pkcs7 -print_certs -text -noout [...] Certificate: Data: Version: 3 (0x2) Serial Number: 39 (0x27) Signature Algorithm: sha256WithRSAEncryption Issuer: O=IDM.EXAMPLE.COM, CN=Certificate Authority Validity Not Before: Jul 1 16:32:45 2019 GMT Not After : Jul 1 16:32:45 2039 GMT Subject: O=IDM.EXAMPLE.COM, CN=Certificate Authority [...]The output shows that the update has been successful as the new CA certificate is listed with the older CA certificates.
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