How to Install Free SSL Certificates on Zimbra Mail Server Centos 7

Add epel repository to the server

[root@mail ~]#  yum -y install epel-release

Install snapd

[root@mail ~]#  sudo yum install snapd

enable snapd

[root@mail ~]#  sudo systemctl enable --now snapd.socket

[root@mail ~]#  sudo ln -s /var/lib/snapd/snap /snap

Now Reboot Your System

[root@mail ~]# reboot

Now install snap core

[root@mail ~]# sudo snap install core

[root@mail ~]#  sudo snap refresh core

Install certbot

[root@mail ~]# sudo snap install --classic certbot

prepare the certbot command

[root@mail ~]# sudo ln -s /snap/bin/certbot /usr/bin/certbot

Now, get the certificate

[root@mail ~]# sudo certbot certonly --standalone --preferred-chain "ISRG Root X1"
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Enter email address (used for urgent renewal and security notices)
 (Enter 'c' to cancel): admin@vkttech.com

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Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.3-September-21-2022.pdf. You must
agree in order to register with the ACME server. Do you agree?
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(Y)es/(N)o: Y

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Would you be willing, once your first certificate is successfully issued, to
share your email address with the Electronic Frontier Foundation, a founding
partner of the Let's Encrypt project and the non-profit organization that
develops Certbot? We'd like to send you email about our work encrypting the web,
EFF news, campaigns, and ways to support digital freedom.
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(Y)es/(N)o: Y
Account registered.
Please enter the domain name(s) you would like on your certificate (comma and/or
space separated) (Enter 'c' to cancel): mail.norditpa.tk norditpa.tk
Requesting a certificate for mail.norditpa.tk and norditpa.tk

Successfully received certificate.
Certificate is saved at: /etc/letsencrypt/live/mail.norditpa.tk/fullchain.pem
Key is saved at:         /etc/letsencrypt/live/mail.norditpa.tk/privkey.pem
This certificate expires on 2023-02-13.
These files will be updated when the certificate renews.
Certbot has set up a scheduled task to automatically renew this certificate in the background.

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If you like Certbot, please consider supporting our work by:
 * Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
 * Donating to EFF:                    https://eff.org/donate-le
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Installing Certificate



[root@mail ~]# cp /etc/letsencrypt/live/mail.norditpa.tk/privkey.pem /opt/zimbra/ssl/zimbra/commercial/commercial.key
[root@mail ~]# chown zimbra:zimbra /opt/zimbra/ssl/zimbra/commercial/commercial.key

[root@mail ~]# wget -O /tmp/ISRG-X1.pem https://letsencrypt.org/certs/isrgrootx1.pem.txt
[root@mail ~]# cat /tmp/ISRG-X1.pem >> /etc/letsencrypt/live/mail.norditpa.tk/chain.pem

Verify your certificate

[root@mail ~]:~# mkdir /opt/zimbra/ssl/letsencrypt
[root@mail ~]# cp /etc/letsencrypt/live/mail.norditpa.tk/* /opt/zimbra/ssl/letsencrypt/

change the ownership of files

[root@mail ~]# chown zimbra:zimbra /opt/zimbra/ssl/letsencrypt/*
[root@mail ~]# ls -la /opt/zimbra/ssl/letsencrypt/

[root@mail ~]# su zimbra
[zimbra@mail root]$ cd  /opt/zimbra/ssl/letsencrypt/

verify the certificate

[zimbra@mail letsencrypt]$ /opt/zimbra/bin/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

Deploy Certificate

[zimbra@mail letsencrypt]$ cp /opt/zimbra/ssl/letsencrypt/privkey.pem /opt/zimbra/ssl/zimbra/commercial/commercial.key
[zimbra@mail letsencrypt]$ /opt/zimbra/bin/zmcertmgr deploycrt comm cert.pem chain.pem
** Verifying 'cert.pem' against '/opt/zimbra/ssl/zimbra/commercial/commercial.key'
Certificate 'cert.pem' and private key '/opt/zimbra/ssl/zimbra/commercial/commercial.key' match.
** Verifying 'cert.pem' against 'chain.pem'
Valid certificate chain: cert.pem: OK
** Copying 'cert.pem' to '/opt/zimbra/ssl/zimbra/commercial/commercial.crt'
** Copying 'chain.pem' to '/opt/zimbra/ssl/zimbra/commercial/commercial_ca.crt'
** Appending ca chain 'chain.pem' to '/opt/zimbra/ssl/zimbra/commercial/commercial.crt'
** Importing cert '/opt/zimbra/ssl/zimbra/commercial/commercial_ca.crt' as 'zcs-user-commercial_ca' into cacerts '/opt/zimbra/common/lib/jvm/java/lib/security/cacerts'
** NOTE: restart mailboxd to use the imported certificate.
** Saving config key 'zimbraSSLCertificate' via zmprov modifyServer mail.norditpa.tk...ok
** Saving config key 'zimbraSSLPrivateKey' via zmprov modifyServer mail.norditpa.tk...ok
** Installing imapd certificate '/opt/zimbra/conf/imapd.crt' and key '/opt/zimbra/conf/imapd.key'
** Copying '/opt/zimbra/ssl/zimbra/commercial/commercial.crt' to '/opt/zimbra/conf/imapd.crt'
** Copying '/opt/zimbra/ssl/zimbra/commercial/commercial.key' to '/opt/zimbra/conf/imapd.key'
** Creating file '/opt/zimbra/ssl/zimbra/jetty.pkcs12'
** Creating keystore '/opt/zimbra/conf/imapd.keystore'
** Installing ldap certificate '/opt/zimbra/conf/slapd.crt' and key '/opt/zimbra/conf/slapd.key'
** Copying '/opt/zimbra/ssl/zimbra/commercial/commercial.crt' to '/opt/zimbra/conf/slapd.crt'
** Copying '/opt/zimbra/ssl/zimbra/commercial/commercial.key' to '/opt/zimbra/conf/slapd.key'
** Creating file '/opt/zimbra/ssl/zimbra/jetty.pkcs12'
** Creating keystore '/opt/zimbra/mailboxd/etc/keystore'
** Installing mta certificate '/opt/zimbra/conf/smtpd.crt' and key '/opt/zimbra/conf/smtpd.key'
** Copying '/opt/zimbra/ssl/zimbra/commercial/commercial.crt' to '/opt/zimbra/conf/smtpd.crt'
** Copying '/opt/zimbra/ssl/zimbra/commercial/commercial.key' to '/opt/zimbra/conf/smtpd.key'
** Installing proxy certificate '/opt/zimbra/conf/nginx.crt' and key '/opt/zimbra/conf/nginx.key'
** Copying '/opt/zimbra/ssl/zimbra/commercial/commercial.crt' to '/opt/zimbra/conf/nginx.crt'
** Copying '/opt/zimbra/ssl/zimbra/commercial/commercial.key' to '/opt/zimbra/conf/nginx.key'
** NOTE: restart services to use the new certificates.
** Cleaning up 3 files from '/opt/zimbra/conf/ca'
** Removing /opt/zimbra/conf/ca/ca.pem
** Removing /opt/zimbra/conf/ca/ca.key
** Removing /opt/zimbra/conf/ca/6224039c.0
** Copying CA to /opt/zimbra/conf/ca
** Copying '/opt/zimbra/ssl/zimbra/ca/ca.key' to '/opt/zimbra/conf/ca/ca.key'
** Copying '/opt/zimbra/ssl/zimbra/ca/ca.pem' to '/opt/zimbra/conf/ca/ca.pem'
** Creating CA hash symlink '6224039c.0' -> 'ca.pem'
** Creating /opt/zimbra/conf/ca/commercial_ca_1.crt
** Creating CA hash symlink '8d33f237.0' -> 'commercial_ca_1.crt'
** Creating /opt/zimbra/conf/ca/commercial_ca_2.crt
** Creating CA hash symlink '4042bcee.0' -> 'commercial_ca_2.crt'

restart the Zimbra services

[zimbra@mail letsencrypt]$ zmcontrol restart
Host mail.norditpa.tk
        Stopping zmconfigd...Done.
        Stopping zimlet webapp...Done.
        Stopping zimbraAdmin webapp...Done.
        Stopping zimbra webapp...Done.
        Stopping service webapp...Done.
        Stopping stats...Done.
        Stopping mta...Done.
        Stopping spell...Done.
        Stopping snmp...Done.
        Stopping cbpolicyd...Done.
        Stopping archiving...Done.
        Stopping opendkim...Done.
        Stopping amavis...Done.
        Stopping antivirus...Done.
        Stopping antispam...Done.
        Stopping proxy...Done.
        Stopping memcached...Done.
        Stopping mailbox...Done.
        Stopping logger...Done.
        Stopping dnscache...Done.
        Stopping ldap...Done.
Host mail.norditpa.tk
        Starting ldap...Done.
        Starting zmconfigd...Done.
        Starting logger...Done.
        Starting mailbox...Done.
        Starting memcached...Done.
        Starting proxy...Done.
        Starting amavis...Done.
        Starting antispam...Done.
        Starting antivirus...Done.
        Starting opendkim...Done.
        Starting snmp...Done.
        Starting spell...Done.
        Starting mta...Done.
        Starting stats...Done.
        Starting service webapp...Done.
        Starting zimbra webapp...Done.
        Starting zimbraAdmin webapp...Done.
        Starting zimlet webapp...Done.

Now, go and check new SSL certificate in browser

Automatic Renewal

[zimbra@mail letsencrypt]$ exit
exit
[root@mail ~]# sudo certbot renew --dry-run
Saving debug log to /var/log/letsencrypt/letsencrypt.log

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Processing /etc/letsencrypt/renewal/mail.norditpa.tk.conf
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Account registered.
Simulating renewal of an existing certificate for mail.norditpa.tk and norditpa.tk

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Congratulations, all simulated renewals succeeded:
  /etc/letsencrypt/live/mail.norditpa.tk/fullchain.pem (success)
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[root@mail ~]#

How to Install Free SSL Certificates on Zimbra Mail Server Centos 7

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