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--- l3:serveri:mail_server_zimbra [2022/05/26 18:43] – [Let's encrypt sertifikat] milano
+++ l3:serveri:mail_server_zimbra [2022/07/11 10:52] (current) – milano
@@ Line 8: / Line 8: @@
   - Kako je server na lokalnoj IP adresi (192.168.0.250) iza firewall-a, ne može uspešno razrešiti javni IP mail.melany.rs pa mu je potreban interni DNS da ga "zavara" da je sve u redu
   - Interni DNS se može dobiti upotrebom daemona BIND ili dnsmasq
 ===== DNSMASQ =====
@@ Line 16: / Line 15: @@
 ===== Let's encrypt sertifikat =====
-  - MOC, u okviru skripte /home/milano/lets_encrypt/lets_gf.sh perbacuje sertifikate iz /etc/letsencrypt/archive/melany.rs-0002/ na /home/ftp/virtual/ftp/temp/web/zimbraCert
+  - MOC, u okviru skripte ''/home/milano/lets_encrypt/lets_gf.sh''  perbacuje sertifikate iz ''/etc/letsencrypt/archive/melany.rs-0002/''  na ''/home/ftp/virtual/ftp/temp/web/zimbraCert''
-  - CRON na zimbri kupi fajlove i prenosi ih u /home/zimbra/cert prethodno brišući postojeći sadržaj
+  - CRON na zimbri kupi fajlove i prenosi ih u ''/home/zimbra/cert''  prethodno brišući postojeći sadržaj
-  - Zatim kombinuje lanac chain.pem sa X1 root sertifikatom komandom (baš u ovom poretku): cat isrgrootx1.pem.txt chain.pem > zmchain.pem
+  - Zatim kombinuje lanac ''chain.pem''  sa X1 root sertifikatom komandom (baš u ovom poretku): ''cat isrgrootx1.pem.txt chain.pem > zmchain.pem''
-  - Fajlovi se prenose u /letsencript folder komandom: cp ./* /opt/zimbra/ssl/letsencrypt/
+  - Fajlovi se prenose u ''/letsencript''  folder komandom: ''cp ./* /opt/zimbra/ssl/letsencrypt/''
-  - Privatni ključ se kopira u /commercial.key:  cp -f privkey.pem /opt/zimbra/ssl/zimbra/commercial/commercial.key
+  - Privatni ključ se kopira u ''/commercial.key'': ''cp -f privkey.pem /opt/zimbra/ssl/zimbra/commercial/commercial.key''
-  - I konačno se registruje novi sertifikat: zmcertmgr deploycrt comm /opt/zimbra/ssl/letsencrypt/cert.pem /opt/zimbra/ssl/letsencrypt/zmchain.pem
+  - I konačno se registruje novi sertifikat: ''zmcertmgr deploycrt comm /opt/zimbra/ssl/letsencrypt/cert.pem /opt/zimbra/ssl/letsencrypt/zmchain.pem''
-  - Restart servera: zmcontrol restart
+  - Restart servera: ''zmcontrol restart''
+Sve je ovo automatizovano, i pokreće se kao ''cron'' zadatak na Zimbra serveru:
+<code>
+#
+# Milano, 28.05.2022.
+# Preuzimam fajlove nakon što je MOC izvršio Certbot proveru koju radi svake subote u 5:30.
+#
+5 * * 6 /home/zimbra/assets/lets_zm.sh
+</code>
+==== Preduslovi za funkcionisanje ''lets_zm.sh'' skripte ====
+  - Na Zimbri je napravljen ''nfs-mount: /home/zimbra/cert/'' koji je povezuje sa ''moc: /etc/letsencrypt'' folderom.
+  - MOC eksponira ''nfs'' folder ''/etc/letsencrypt'' samo Zimbra serveru i to u ''ro'' režimu. \\ **Folder sadrži privatni ključ i veoma je važno da ostane zaštićen!!!**
+  - Na Zimbri, u folderu ''/home/zimbra/assets'' nalazi se ''isrgrootx1.pem.txt'' fajl koji sadrži **pem** blok ISRG Root X1 sertifikata koji se kombinuje sa Let's Encryptovim.
+===== Fail2Ban zaštita =====
+Učestalo je zaključavanje ''office@melany.rs'' ali i ''milan@melany.rs'' naloga zbog pokušaja probijanja "brutalnim nabadanjem lozinke".
+Kako bi sprečili //brute-force// napade instaliran je ''fail2ban'' servis.
+Za instalaciju je praćeno uputstvo sa [[https://imanudin.net/2020/07/05/how-to-install-and-configure-fail2ban-for-zimbra|ove stranice]].
+Pošto stranica može da "nestane", evo i transkripta:
+**1. Install pip**
+<code>yum install python3-pip</code>
+**2. Install dependencies required by Fail2Ban**
+<code>
+pip3 install pyinotify
+pip3 install dnspython
+</code>
+**3. Download and extract Fail2Ban**
+<code>
+cd /tmp/
+wget -c https://github.com/fail2ban/fail2ban/archive/0.9.4.tar.gz
+</code>
+**4. Install Fail2Ban**
+<code>
+tar -xvf 0.9.4.tar.gz
+cd fail2ban-0.9.4
+python3 setup.py install
+</code>
+**5. Copy Fail2Ban service to systemd**
+<code>cp files/fail2ban.service /usr/lib/systemd/system/</code>
+**6. Adjust bin location on Fail2Ban service**
+<code>nano /usr/lib/systemd/system/fail2ban.service</code>
+Adjust the following lines. Change ''/usr/bin'' become ''/usr/local/bin''
+<code>
+ExecStart=/usr/local/bin/fail2ban-client -x start
+ExecStop=/usr/local/bin/fail2ban-client stop
+ExecReload=/usr/local/bin/fail2ban-client reload
+</code>
+Create fail2ban folder
+<code>
+mkdir /var/run/fail2ban
+nano /usr/lib/tmpfiles.d/var.conf
+</code>
+Add this line at the bottom
+<code>d /var/run/fail2ban 0755 - - -</code>
+Reload systemd
+<code>systemctl daemon-reload</code>
+**7. Create zimbra.jail**
+<code>nano /etc/fail2ban/jail.d/zimbra.local</code>
+Fill with the following lines and save
+<code>
+[zimbra-submission]
+enabled = true
+filter = zimbra-submission
+logpath = /var/log/zimbra.log
+maxretry = 3
+findtime = 3600
+bantime = 36000
+action = iptables-multiport[name=zimbra-submission, port="25,465,587", protocol=tcp]
+[zimbra-webmail]
+enabled = true
+filter = zimbra-webmail
+logpath = /opt/zimbra/log/mailbox.log
+maxretry = 3
+findtime = 3600
+bantime = 36000
+action = iptables-multiport[name=zimbra-webmail, port="80,443", protocol=tcp]
+[zimbra-admin]
+enabled = true
+filter = zimbra-admin
+logpath = /opt/zimbra/log/mailbox.log
+maxretry = 3
+findtime = 3600
+bantime = 36000
+action = iptables-multiport[name=zimbra-admin, port="7071", protocol=tcp]
+</code>
+**8. Create filters**
+– Zimbra Admin
+<code>curl -k https://raw.githubusercontent.com/imanudin11/zimbra-fail2ban/master/zimbra-admin.conf > /etc/fail2ban/filter.d/zimbra-admin.conf</code>
+– Zimbra Webmail
+<code>curl -k https://raw.githubusercontent.com/imanudin11/zimbra-fail2ban/master/zimbra-webmail.conf > /etc/fail2ban/filter.d/zimbra-webmail.conf</code>
+– Zimbra SMTP/SMTPS/Submission
+<code>curl -k https://raw.githubusercontent.com/imanudin11/zimbra-fail2ban/master/zimbra-submission.conf > /etc/fail2ban/filter.d/zimbra-submission.conf</code>
+**9. Ignore localhost and Zimbra IP**
+Open file /etc/fail2ban/jail.conf. Find line **“ignoreip =”** and add the IP address that will be ignored from Fail2Ban checking. You can use comma or space to add multiple IP
+<code>ignoreip = 127.0.0.1/8 IP-ADDRESS-OF-ZIMBRA/32 OTHER-IP-ADDRESS/32</code>
+**10. Enable and restart Fail2Ban**
+<code>
+systemctl enable fail2ban
+systemctl restart fail2ban
+</code>