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This page is an up-to-date version of ObtainingHostCertificates

TODO Obtaining host certificates for Grid servers

Certificates now agaim come from QuoVadis. Their services have been contracted by SwiNG (now EnhanceR) and the University of Berne is our liaison for the service. The way to order new host certificates is described here https://wiki.chipp.ch/twiki/bin/view/CmsTier3/GridHostCert

Certificates for LDAP service and LDAP clients

The ldap service and client certificates are special in the sense that they are based upon our own Tier-3 CA, since there was no possibility at the foundation of the Tier-3 to have the Identity management included with the central AD (same as for SLS), and we had many external users. Also, we wanted to manage grid user attributes like the x509 grid certificate DN in the LDAP database to automate tasks (e.g. automatic generation of authorization configurations for the grid storage). We are still running the LDAP server as of 2020, and should consider integration with PSI AD.

The machinery for using the Tier-3 CA is located on the t3admin02 node in /root/clusteradmin/etc/cluster-ca

You will find a readme there containing

Use the cluster-ca.sh script to produce the certificate.

The config files are already prepared. Just use something like
    ./cluster-ca.sh -r ./pki -s t3admin01.psi.ch

The certificates are then found under the ./pki/certs directory. You may have
to first remove any old cert and csr files for that node (e.g. if you want to
renew). The script will tell you.


cluster-ca.sh help text:
         cluster-ca.sh [options] --rootca
         cluster-ca.sh [options] -s server.domain.org

         -r path      : Path to repository directory (/root/clusteradmin/etc/cluster-ca/test-CA)

         -s hostname  : server hostname for which to produce a cert
         -t template  : template SSL config name to use for producing server
                        request and cert files (default.cnf)
         -d           : debug mode


For producing a Certificate for our LDAP master server:
First copy away the old cert /root/clusteradmin/etc/cluster-ca/pki/certs/t3admin01.psi.ch-cert.pem
(leave the key in place!!!), and then run
./cluster-ca.sh -r ./pki -s t3admin01.psi.ch

Producing a certificate for the LDAP service

On t3admin02 go to the following directory

cd /root/clusteradmin/etc/cluster-ca 

Ensure that the CA root certificate is still OK:

openssl x509 -in /root/clusteradmin/etc/cluster-ca/pki/rootca/rootca-cert.pem -dates -subject -noout

notBefore=Apr  1 12:16:43 2019 GMT
notAfter=Mar 30 12:16:43 2024 GMT
subject= /C=CH/ST=Aargau/L=Villigen/O=PSI/CN=PSI CMS Tier-3 Cluster Root CA

The CA root certificate is distributed to all client nodes (basically all cluster nodes). Without it, our CA will not be accepted on the nodes. If the CA root certificate needs to be regenerated, you must copy it to all the client nodes (and also to the LDAP server).

  • for SL6 nodes that use nslcd: copy it to /etc/openldap/certs/08a2f47c.0 (The filename is a hash that is obtained by using openssl x509 -noout -hash -in rootca-cert.pem).
  • for SL7 nodes using sssd: copy it to /etc/openldap/cacerts/cacert.pem

Now we can generate the new service certificate for LDAP (or for another service).

 cd /root/clusteradmin/etc/cluster-ca

 # move the old cert and the old csr (signing request) away. Usually you should keep the existing key!!!
 mv pki/certs/t3ldap01.psi.ch-cert.pem pki/certs/OLD-CERTS/t3ldap01.psi.ch-csr.pem.till20190715
 mv pki/certs/t3ldap01.psi.ch-csr.pem pki/certs/OLD-CERTS/t3ldap01.psi.ch-cert.pem.till20190715

 # generate the cert
 ./cluster-ca.sh -r ./pki -s t3ldap01.psi.ch

The resulting certificate will be generated under /pki/certs. The signing is done with the root CA certificate that is stored within pki/rootca based on the template in pki/template.

Note: Conf file (./pki/certs/t3ldap01.psi.ch.cnf) already exists for this server. Will use old one
Note: Keyfile (./pki/certs/t3ldap01.psi.ch-key.pem) already exists. Using old one
/usr/bin/openssl req -new -key ./pki/certs/t3ldap01.psi.ch-key.pem -sha256 -out ./pki/certs/t3ldap01.psi.ch-csr.pem -config ./pki/certs/t3ldap01.psi.ch.cnf
/usr/bin/openssl x509 -req -in ./pki/certs/t3ldap01.psi.ch-csr.pem -sha256 -extfile ./pki/certs/t3ldap01.psi.ch.cnf -extensions certificate_extensions -CA ./pki/rootca/rootca-cert.pem -CAkey ./pki/rootca/rootca-key.pem -CAcreateserial -passin file:./pki/rootca/rootca.pwd -out ./pki/certs/t3ldap01.psi.ch-cert.pem -days 365
Signature ok
subject=/C=CH/ST=Aargau/L=Villigen/O=PSI CMS Tier-3/CN=t3ldap01.psi.ch
Getting CA Private Key
subject= /C=CH/ST=Aargau/L=Villigen/O=PSI CMS Tier-3/CN=t3ldap01.psi.ch
notBefore=Jul 15 09:51:59 2019 GMT
notAfter=Jul 14 09:51:59 2020 GMT
issuer= /C=CH/ST=Aargau/L=Villigen/O=PSI/CN=PSI CMS Tier-3 Cluster Root CA

Then copy the certificate (and potentially also the key, if you changed it) to the LDAP service:

scp  /root/clusteradmin/etc/cluster-ca/pki/certs/t3ldap01.psi.ch-cert.pem t3ldap01:/etc/pki/tls/certs/slapd-cert.pem

The location of the LDAP service certificate is defined in the slapd configuration file /etc/openldap/slapd.conf

Log in to the LDAP server and Confirm that the dates look right:

openssl x509 -in /etc/pki/tls/certs/slapd-cert.pem  -subject -dates -noout 

Restart ldap to make it reread its certificate and key:

/etc/init.d/ldap restart

from any client node (e.g. UI) test whether the certificate is active in the service by using openssl to retrieve and interpret the certificate directly from the service!

echo | openssl  s_client  -connect  t3ldap01.psi.ch:636 2> /dev/null | openssl x509 -subject -dates -noout

-- DerekFeichtinger - 2019-07-15

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Topic revision: r6 - 2020-06-09 - DerekFeichtinger
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