Recreating a Self-Signed SSL Certificate in ZCS 4.5 & 5.0

Revision as of 14:43, 22 March 2008 by Cvidal (talk | contribs) (Install the server certificate files (as zimbra))

Self Signed Certificate Instructions

WARNINGS

- If you're working with a commercial certificate, do *NOT* use this page - go Commercial Certificates instead

- Please read all instructions and pay attention to specific 4.5(and prior) vs 5.0 sections & notes.

- V5.0 will include a certificates area in your tools section of the admin interface so you might try using that first.

To clean up SSL certificates and recreate a new self-signed cert:

Why recreate my certificates

If you're seeing an error like this when you run zmprov:

[] ERROR: java.security.cert.CertificateExpiredException: NotAfter: Sun Oct 08 00:38:45 EDT 2006
ERROR: zclient.IO_ERROR (invoke java.security.cert.CertificateException: Untrusted Server Certificate Chain, server: localhost)    
(cause: javax.net.ssl.SSLHandshakeException java.security.cert.CertificateException: Untrusted Server Certificate Chain)

your certs are expired, and need to be recreated

Back up existing certificates

  • This backs up the default certificates created by zmcreateca and zmcreatecert:
tar cf /tmp/zimbra-ssl-bak.tar /opt/zimbra/ssl/
  • This backs up the server's working certificate files:
cd /opt/zimbra/
tar cf /tmp/zimbra-certs.tar conf/ca/ conf/*.crt conf/*.key conf/*.pem tomcat/conf/keystore java/jre/lib/security/cacerts

Delete and re-create SSL Directory (as root)

su -
rm -rf /opt/zimbra/ssl
mkdir /opt/zimbra/ssl
chown zimbra:zimbra /opt/zimbra/ssl

Give the zimbra user write access to the cacerts keystore

  • On linux the java cacerts file is a part of the ZCS installation.
chown zimbra:zimbra /opt/zimbra/java/jre/lib/security/cacerts
chmod 644 /opt/zimbra/java/jre/lib/security/cacerts
  • On Mac OS X the java cacerts file is a part of the system's java installation. Either run the "keytool -delete ..." command in the next section as root or give write access to the zimbra user.
chown zimbra:zimbra /System/Library/Frameworks/JavaVM.framework/Versions/1.5/Home/lib/security/cacerts
chmod u+w /System/Library/Frameworks/JavaVM.framework/Versions/1.5/Home/lib/security/cacerts

Remove the self-signed root certificate from the cacerts keystore (as zimbra)

  • Mac OS X
keytool -delete -alias my_ca -keystore /System/Library/Frameworks/JavaVM.framework/Versions/1.5/Home/lib/security/cacerts -storepass changeit
  • Linux
keytool -delete -alias my_ca -keystore /opt/zimbra/java/jre/lib/security/cacerts -storepass changeit

Delete the server cert from the mailboxd keystore (as zimbra)

  • For ZCS upto 4.5.x (tomcat)
su - zimbra
keytool -delete -alias tomcat -keystore /opt/zimbra/tomcat/conf/keystore -storepass zimbra
  • For ZCS 5.0+ (mailboxd/jetty)
su - zimbra
keytool -delete -alias jetty -keystore /opt/zimbra/mailboxd/etc/keystore -storepass zimbra
  • Storepass is normally stored in localconfig
su - zimbra
zmlocalconfig -s -m nokey tomcat_keystore_password

or for 5.0 (jetty)

su - zimbra
zmlocalconfig -s -m nokey mailboxd_keystore_password

Perform optional configuration

  • If you want to change the duration of the certificate from the default (365 days), modify the "default_days" entry in the file /opt/zimbra/conf/zmssl.cnf.in

Workaround: zmssl.cnf.in default_days is ingnored. Currently you will need to edit zmcreateca and zmcreatecert: Bug is http://bugzilla.zimbra.com/show_bug.cgi?id=12228

  • If you want the common name show up in the CA rather than 'Zimbra Collaboration Suite' because you have several zimbra servers. Please Note: I probably have unnecessary steps in this section here, but this is what I did to get it working for me.
vi /opt/zimbra/conf/zmssl.cnf.in
[change section to appear as below]
0.organizationName              = Zimbra
0.organizationName_default      = Zimbra
# we can do this but it is not needed normally :-)
#1.organizationName             = Second Organization Name (eg, company)
#1.organizationName_default     = World Wide Web Pty Ltd
organizationalUnitName          = Zimbra
organizationalUnitName_default  = Zimbra
commonName                      = <put your hostname here -- @@HOSTNAME@@ doesn't seem to work>
commonName_max                  = 64
commonName_default              = <put your hostname here -- @@HOSTNAME@@ doesn't seem to work>

Create the CA certificate (as zimbra)

  • for 4.*
zmcreateca
  • for 5.* (as root)
/opt/zimbra/bin/zmcertmgr createca -new
  • (OPTIONAL) If you did the Optional step to make the CN the hostname for the CA, the output should be like the following:
...
Signature ok
subject=/C=US/ST=N/A/L=N/A/O=Zimbra/OU=Zimbra/CN=<your hostname>
Getting Private key
unable to write 'random state'

Install server ca files

  • 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, 4.*):
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
  • 5.* (as root)
/opt/zimbra/bin/zmcertmgr deployca -localonly

Create the server certificate (as zimbra)

  • 4.*
zmcreatecert
  • 5.* (as root)
/opt/zimbra/bin/zmcertmgr createcrt self -new
# Optional
/opt/zimbra/bin/zmcertmgr verifycrt self

If you wish to have several names on the certificate, supply them as arguments

zmcreatecert mail.mydomain.com webmail.mydomain.com webmail.yourdomain.com

Install the server certificate files (as zimbra)

  • For Tomcat (ZCS upto 4.5.x)
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
  • For Mailboxd (ZCS < 5.0.3)
zmcertinstall mailbox /opt/zimbra/ssl/ssl/server/mailboxd.crt
zmcertinstall mta /opt/zimbra/ssl/ssl/server/server.crt /opt/zimbra/ssl/ssl/server/server.key
  • To update CA cert stored in LDAP (as zimbra, 4.x):
zmprov -l mcf zimbraCertAuthorityKeySelfSigned "`cat /opt/zimbra/ssl/ssl/ca/ca.key`"
zmprov -l mcf zimbraCertAuthorityCertSelfSigned "`cat /opt/zimbra/ssl/ssl/ca/ca.pem`"
  • 5.x (as root)
chmod 755 /opt/zimbra/ssl/zimbra /opt/zimbra/ssl/zimbra/ca
su - zimbra
zmprov -l mcf zimbraCertAuthorityKeySelfSigned "`cat /opt/zimbra/ssl/zimbra/ca/ca.key`"
zmprov -l mcf zimbraCertAuthorityCertSelfSigned "`cat /opt/zimbra/ssl/zimbra/ca/ca.pem`"
exit
chmod 700 /opt/zimbra/ssl/zimbra /opt/zimbra/ssl/zimbra/ca
 
  • You can see your updated certs in LDAP now and compare them to contents of /opt/zimbra/ssl/ssl/ca (as zimbra)
zmprov -l gcf zimbraCertAuthorityKeySelfSigned 
zmprov -l gcf zimbraCertAuthorityCertSelfSigned

Restart zimbra services

  • It may be necessary to restart the Zimbra servers for the changes to take effect (as zimbra).
zmcontrol stop
zmcontrol start

Other Possible Issues

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.

Permission denied (publickey,gssapi-with-mic)

http://www.ncsa.uiuc.edu/UserInfo/Resources/Software/ssh/openssh_3.8.html

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