Renew letsencrypt ssl certificate for zimbra 8.8.15

 Letsencrypt certs usually consists of these files:

1. cert.pem

2. chain.pem

3. fullchain.pem

4. privkey.pem

I am not going to discuss about how you get those files from letsencrypt. This is for how to renew ssl cert for zimbra specifically version 8.8.15 GA 4717 that i am using. It may or may not work for previous or later version. YMMV

Put the folder containing the certs in /opt/zimbra. Let's say directory named letsencrypt. Make sure it owns by zimbra. 

Step 1:

Download letsencrypt root cert here to the same folder as those letsencrypt certs above. The file name is isrgrootx1.pem.

Step 2:

run this: cat isrgrootx1.pem >> chain.pem

Step 3:

Verify the certs using zmcrtmgr. Run the command as user zimbra. The output as following:

zmcertmgr verifycrt comm privkey.pem cert.pem chain.pem  
** Verifying 'cert.pem' against 'privkey.pem'
Certificate 'cert.pem' and private key 'privkey.pem' match.
** Verifying 'cert.pem' against 'chain.pem'
Valid certificate chain: cert.pem: OK

Step 4: 

If step 3 above is ok. Deploy the certs (asa user zimbra)

zmcertmgr deploycrt comm  cert.pem chain.pem

Step 5: 

If step above is successful. Restart the services (as user zimbra):

zmcontrol restart

If there's no error. Your zimbra's ssl is renewed successfully.

Zimbra: Restore or import a user mailbox from backup using CLI

If you have backed up or exported an account and named the compressed backup file as backup.tgz, you can restore or import using zimbra webgui or CLI. CLI is the preferred method if involving backup file bigger than 500MB. The command is as below(run as user zimbra):

zmmailbox -z -m email@domain.com postRestURL "/?fmt=tgz&resolve=skip" backup.tgz

That's all there is to it.

Installing thawte SSL cert in Zimbra 8.6.0

1. Create csr and keep your key file. Copy the key file to /opt/zimbra/ssl/zimbra/commercial/commercial.key
2. Give or upload your csr file to certificate provider
3. Get certificate given by your cert provider after your csr is accepted.
4. Get the root certificate of your provider. For thawte, mine is here
5. Get intermediate certificate. Mine is here
6. Combine the content of the root and intermediate cert files e.g cat intermediate.crt root.crt > commercial_ca.crt and copy it to dir /opt/zimbra/ssl/zimbra/commercial

Below is the steps to verify that the certificates are ok and ready to deploy. You can skip the first step if you have already create the csr.

Single-Node Commercial Certificate

We need to take care and ask for the Certificate authority for the Root and Intermediate Keys, we will need it soon.

We will use at least 2048-bit key, is the minimum for all Certificate Authorities: 1. Begin by generating a Certificate Signing Request (CSR).

/opt/zimbra/bin/zmcertmgr createcsr comm -new -subject "/C=US/ST=CA/L=Sunnyvale/O=Zimbra/OU=Zimbra Collaboration Suite/CN=host.example.com" -subjectAltNames host.example.com

2. Next, submit the CSR to the SSL provider and get a commercial certificate in PEM format. Save the new certificate to a temporary file (e.g. /tmp/commercial.crt).

3. Now, download and save the root Certificate Authority (CA) from your provider to a temporary file. (e.g. /tmp/ca.crt)

4. Download any intermediary CAs from your provider to a temporary file. (e.g. /tmp/ca_intermediary.crt)

5. Combine root and intermediary CAs into a temporary file.

cat /tmp/ca_intermediary.crt /tmp/ca.crt > /tmp/ca_chain.crt

6. Verify your commercial certificate.

/opt/zimbra/bin/zmcertmgr verifycrt comm /opt/zimbra/ssl/zimbra/commercial/commercial.key /tmp/commercial.crt /tmp/ca_chain.crt
**Verifying /tmp/commercial.crt against
/opt/zimbra/ssl/zimbra/commercial/commercial.key
Certificate (/tmp/commercial.crt) and private key
(/opt/zimbra/ssl/zimbra/commercial/commercial.key) match.
Valid Certificate: /tmp/commercial.crt: OK

7. Deploy your commercial certificate.

/opt/zimbra/bin/zmcertmgr deploycrt comm /tmp/commercial.crt /tmp/ca_chain.crt
** Verifying /tmp/commercial.crt against
/opt/zimbra/ssl/zimbra/commercial/commercial.key
Certificate (/tmp/commercial.crt) and private key
(/opt/zimbra/ssl/zimbra/commercial/commercial.key) match.
Valid Certificate: /tmpt/commercial.crt: OK
**Copying commercial.crt to /opt/zimbra/ssl/zimbra/commercial/commercial.crt
**Appending CA chain /tmp/ca_chain.crt to
/opt/zimbra/ssl/zimbra/commercial/commercial.crt
**Saving server config key zimbraSSLCeretificate…done.
**Saving server config key zimbraSSLPrivateKey…done.
**Installing mta certificate and key…done.
**Installing slapd certificate and key…done.
**Installing proxy certificate and key…done.
**Creating pkcs12 file /opt/zimbra/ssl/zimbra/jetty.pkcs12…done.
**Creating keystore file /opt/zimbra/mailbox/etc/keystore…done.
**Installing CA to /opt/zimbra/conf/ca…done.

If you get error "unable to get issuer certificate, please look at the steps in the link below.

https://wiki.zimbra.com/wiki/Fix_depth_lookup:unable_to_get_issuer_certificate