DeutschEnglish

Submenu

 - - - By CrazyStat - - -

9. September 2012

Zimbra: Creating a new self-signed SSL certificate

Filed under: Linux,Server Administration — Tags: , , , , , , , , , — Christopher Kramer @ 10:04

I recently had to recreate the SSL certificate of a Zimbra server and surprisingly it was not as easy as the documentation looked like, so I’d like to document how it is done and make comments on some difficulties that might come up.

So this is how it is done (on a Ubuntu Server running Zimbra Network edition 6.0.16 GA):

  1. SSH into the server, login as root
  2. Switch to the zimbra-user using
    su - zimbra
  3. Then run the following commands:
     sudo /opt/zimbra/bin/zmcertmgr createca -new
     sudo /opt/zimbra/bin/zmcertmgr deployca
     sudo /opt/zimbra/bin/zmcertmgr deploycrt self
  4. Restart Zimbra. To do so, as user zimbra, issue these commands (no sudo here):
    /opt/zimbra/bin/zmcontrol stop
    /opt/zimbra/bin/zmcontrol start

So the difficulties I had and some remarks:

  • sudo kept asking me for a password when I typed in
    sudo zmcertmgr createca -new

    Seems I am not the only one with this problem. The zmcertmgr command is white-listed in /etc/sudoers so you should normally not be asked for a password. Run the following command to edit /etc/sudoers (do not edit it in any other way!)

    visudo

    So make sure in this file the following line is included:

    %zimbra ALL=NOPASSWD:/opt/zimbra/bin/zmcertmgr

    The % at the beginning seems to belong there. Note that the zimbra wiki has typo (zmvertmgr) in this line.
    But although I had this line in there, sudo kept asking me for the password. So what finally worked was invoking zmcertmgr with the complete path (as done above).
    Update: It seems I had a typo in here myself. Make sure it is “zmcertmgr”  and not “zmzertmgr” ;-)
    Thanks to the comment by erolha!

  • In the Zimbra Release notes, the last command for updating the certificate is
    sudo zmcertmgr deploycrt self -new

    I got this error:

    Can't deploy cert for -new.  Unknown service.

    Without -new (and the complete path), it went through well.

  • No zimbra documentation I found mentions that a restart of zimbra is required, but without a restart, the old certificate was still used when opening the webmailer or the admin interface via https.

 

I hope I could help some of you that run into one of these problems.

Recommendation

Try my Open Source PHP visitor analytics script CrazyStat.

2 Comments »

  1. [...] I recently wrote about how to configure a new self-signed certificate for Zimbra. [...]

    Pingback by Zimbra: Setting up a free (real) “commercial” SSL certificate « Christosoft Blog — 11. September 2012 @ 20:44

  2. Thank you for coming up with this solution!

    (You have a typo though;

    So make sure in this file the following line is included:
    1 %zimbra ALL=NOPASSWD:/opt/zimbra/bin/zmZertmgr

    should have been

    So make sure in this file the following line is included:
    1 %zimbra ALL=NOPASSWD:/opt/zimbra/bin/zmCertmgr

    I guess? :)

    Comment by erolha — 27. November 2012 @ 21:04

RSS feed for comments on this post. TrackBack URL

Leave a comment

%d bloggers like this: