CertLet is both a Certbot plugin to allow IPA (FreeIPA/Redhat Satellite) DNS authentication for authentication of and a Certmonger Helper to allow FreeIPA to use Let’s Encrypt certificates.
This allows hosts in FreeIPA to automatically get publicly trusted certificates for all purposes and allows hosts to get valid certificates for multiple domain names.
Due to using DNS based authentication certificates can be issued for private servers as well as public ones without any service interruptions. This also allows certificates to include multiple principals or up to 99 host/DNS names.
sudo getcert add-ca -c LetsEncrypt -e $(which cerlet)
umask 0002 sudo dnf update -y sudo dnf -y install wget git gcc openldap-devel krb5-devel libffi-devel sudo dnf -y install ca-certificates sudo dnf install python3-virtualenv sudo wget https://letsencrypt.org/certs/isrgrootx1.pem -O /etc/pki/ca-trust/source/anchors/isrgrootx2.pem sudo update-ca-trust force-enable && sudo update-ca-trust extract sudo ipa-client-install –ca-cert-file=/etc/pki/ca-trust/source/anchors/isrgrootx1.pem mkdir -p $HOME/Revisions && cd $HOME/Revisions git clone email@example.com:antevens/cerlet.git && cd $HOME/Revisions/cerlet virtualenv-3.6 -p python3.6 /home/vagrant/Virtualenv source /home/vagrant/Virtualenv/bin/activate python setup.py develop kinit && cerlet
KerberosError: No valid Negotiate header in server response
This means you don’t have a valid kerberos ticket to communicate with FreeIPA and perform the required API calls to modify DNS entries as required. Try using kinit to get a valid kerberos ticket with the permissions to modify DNS entries.
ipalib.errors.KerberosError: Major (851968): Unspecified GSS failure. Minor code may provide more information, Minor (2529638949): Clock skew too great
This is usually because you’re using a virtual machine and it’s been suspended for a while, this causes the clock on the virtual machine to go out of sync and will need to be re-adjusted, if NTP is installed the easiest way to update the clock is: sudo ntpdate -u pool.ntp.org