Recreating a Self-Signed SSL Certificate in ZCS 4.5 & 5.0
Self Signed Certificate Instructions
If you're working with a commercial certificate, do *NOT* use this page - go here instead
- To clean up SSL certificates and recreate a new self-signed cert try this.
- First though, it won't hurt to back up what you already have:
tar -cf /tmp/zimbra-ssl-bak.tar /opt/zimbra/ssl/
- (EVERYBODY) Delete and re-create SSL Directory (as root):
su - rm -rf /opt/zimbra/ssl mkdir /opt/zimbra/ssl chown zimbra:zimbra /opt/zimbra/ssl
- (LINUX ONLY) Additional Steps:
chown zimbra:zimbra /opt/zimbra/java/jre/lib/security/cacerts chmod 644 /opt/zimbra/java/jre/lib/security/cacerts
- (EVERYBODY) Delete CA
(Mac OS X ONLY) The file is owned by root so you'll get "permission denied" if you don't import as root: keytool -delete -alias my_ca -keystore /System/Library/Frameworks/JavaVM.framework/Versions/1.5/Home/lib/security/cacerts -storepass changeit
(LINUX ONLY) su - zimbra keytool -delete -alias my_ca -keystore /opt/zimbra/java/jre/lib/security/cacerts -storepass changeit
- (EVERYBODY) Delete Tomcat cert (as zimbra):
su - zimbra keytool -delete -alias tomcat -keystore /opt/zimbra/tomcat/conf/keystore -storepass zimbra
- If you want the certificate to last longer than 365 days (as zimbra)
vi /opt/zimbra/conf/zmssl.cnf.in [change value for default_days as appropriate]
- Now create the CA (as zimbra)
zmcreateca
- After creating the ca, it appears that zmcreateca doesn't copy the new ca.key and ca.pem to /opt/zimbra/conf/ca, so do it manually (as zimbra):
cp /opt/zimbra/ssl/ssl/ca/ca.key /opt/zimbra/conf/ca/ca.key cp /opt/zimbra/ssl/ssl/ca/ca.pem /opt/zimbra/conf/ca/ca.pem
- Now create the Cert (as zimbra)
zmcreatecert
- Now install the Cert and Key (as zimbra)
zmcertinstall mailbox /opt/zimbra/ssl/ssl/server/tomcat.crt zmcertinstall mta /opt/zimbra/ssl/ssl/server/server.crt /opt/zimbra/ssl/ssl/server/server.key
- I don't know what the CA cert stored in LDAP is used for, or if it is used at all, but it is *not* updated by the above steps. To update CA cert (as zimbra):
cat /opt/zimbra/ssl/ssl/ca/ca.key zmprov -l mcf zimbraCertAuthorityKeySelfSigned "-----BEGIN RSA PRIVATE KEY----- [paste the contents of ca.key from above - I needed to construct this whole command in a text editor then paste into the CLI] -----END RSA PRIVATE KEY-----"
cat /opt/zimbra/ssl/ssl/ca/ca.pem zmprov -l mcf zimbraCertAuthorityCertSelfSigned "-----BEGIN TRUSTED CERTIFICATE----- [paste the contents of ca.pem from above - I needed to construct this whole command in a text editor then paste into the CLI] -----END TRUSTED CERTIFICATE-----"
- You can see your updated certs in LDAP now and compare them to contents of /opt/zimbra/ssl/ssl/ca (as zimbra)
zmprov gcf zimbraCertAuthorityKeySelfSigned zmprov gcf zimbraCertAuthorityCertSelfSigned
- It may be necessary to restart the Zimbra servers for the changes to take effect (as zimbra).
zmcontrol stop zmcontrol start
Note about 'unable to write random state'
This is a "harmless" warning that openssl has no random number seed file. The full story is available from openssl.org.