Renewing Puppet Certificates

On March 7th of 2019, our SSL certificates for Puppet/Foreman and TLS LDAP all reached their five year expiration period. This has caused Puppet and Foreman to stop working and our authentication server cannot be accessed. I cannot create new users that are recognized by the cluster. And users cannot login to machines that they have previously never logged into. You can imagine the trouble this has caused. As of March 22, I have not solved this yet but I will be documenting my attempts to fix this.

Get subject of original certificate

[root@alpha ~]# openssl x509 -in /var/lib/puppet/ssl/ca/ca_crt.pem -noout -subject

Get serial of original certificate

[root@alpha ~]# openssl x509 -in /var/lib/puppet/ssl/ca/ca_crt.pem -noout -serial
serial=01

Extract info from puppetmaster cert

[root@alpha ~]# openssl x509 -in /var/lib/puppet/ssl/certs/puppetmaster.cluster.ucsf.bkslab.org.pem -text -noout \
-certopt no_subject,no_header,no_version,no_serial,no_signame,no_validity,no_subject,no_issuer,no_pubkey,no_sigdump,no_aux

Create certificate signing request with existing files

[root@alpha ~]# openssl req -key /root/puppet_renewal/ca/ca_key.pem -new -batch -subj "/CN=Puppet CA: alpha.ucsf.bkslab.org" -out /root/puppet_renewal/ca/ca_new.csr

Create a new CA certificate

[root@alpha ~]#openssl x509 -req -days 3650 -in /root/puppet_renewal/ca/ca_new.csr -signkey /root/puppet_renewal/ca/ca_key.pem \
-out /root/puppet_renewal/ca/ca_crt.pem -extfile /root/puppet_renewal/renewpuppet.cnf -extensions v3_ca -set_serial 1
Signature ok
subject=/CN=Puppet CA: alpha.ucsf.bkslab.org
Getting Private key

Get serial number for your existing CA

[root@alpha puppet_renewal]# echo $((0x`cat /var/lib/puppet/ssl/ca/serial`))
451

Create new certificate signing request with puppet server's key

[root@alpha ~]# openssl req -key /root/puppet_renewal/puppetmaster/private_keys/puppetmaster.cluster.ucsf.bkslab.org.pem -new \
-batch -subj "/CN=alpha.ucsf.bkslab.org" -out /root/puppet_renewal/mypuppetmaster.csr

Create new puppet master's certificate

[root@alpha ~]# # openssl x509 -extfile /root/puppet_renewal/renewpuppet.cnf -extensions v3 -req -days 1825 -in /root/puppet_renewal/mypuppetmaster.csr \
-CA /root/puppet_renewal/ca/ca_crt.pem -CAkey /root/puppet_renewal/ca/ca_key.pem -CAcreateserial \
-out /root/puppet_renewal/puppetmaster/certs/puppetmaster.cluster.ucsf.bkslab.org.pem -sha256 -set_serial 451