Set up a reverse proxy in Linux

Setting up an Apache HTTP reverse proxy server in Linux requires the Apache 2.4 software and edits to some configuration file.

1. Make sure you have set the REVERSE_PROXY_SETUP parameter as true in the properties.txt file when installing IXIASOFT CCMS Web.
2. Edit the configuration file for the Tomcat server /opt/ixiasoft/ccms/apache-tomcat-9.0.31/conf/catalina.properties.
3. Add the following line at the end of the file if it doesn't exist:

   org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=true

4. Edit the Tomcat server configuration file /opt/ixiasoft/ccms/apache-tomcat-9.0.31/conf/server.xml.
5. Make sure <Connector> sections are set to listen only on the localhost (127.0.0.1) interface:

   <Connector port="8080" protocol="HTTP/1.1"
   address="127.0.0.1"
   ......other settings......
   connectionTimeout="20000"
   redirectPort="8443" />

6. Restart the Tomcat service to apply the changes:
   # systemctl restart tomcat-ccms
7. Download the required files:
   1. Go to the standard CentOS yum repository at # yum install httpd mod_ssl.
   2. Download the latest Apache 2.4 httpd and the required SSL module.
8. Create a new file in the /etc/httpd/conf.d/ folder called reverse-proxy.conf with the following content, replacing webserver.acme.com with your server's FQDN address:

   ProxyRequests Off
   ProxyPreserveHost On
   RewriteEngine On
   RedirectMatch ^/$ https://webserver.acme.com/ixiasoft-ccms
   RewriteRule "^/oxygen-webapp/app/admin.html" - [R=403]
   ProxyPass "/ixiasoft-ccms" "http://127.0.0.1:8080/ixiasoft-ccms"
   ProxyPassReverse "/ixiasoft-ccms" "https://webserver.acme.com/ixiasoft-ccms"
   ProxyPass "/oxygen-webapp" "http://127.0.0.1:8080/oxygen-webapp"
   ProxyPassReverse "/oxygen-webapp" "https://webserver.acme.com/oxygen-webapp"

9. Copy your server's SSL certificate files to the appropriate location on the server.
   For example, copy the certificates to /etc/pki/tls/certs/ and the key file in /etc/pki/tls/private/.
10. Edit the /etc/httpd/conf.d/ssl.conf configuration file and make the following changes:
    1. Configure paths and proper names for your SSL certificates in the properties: SSLCertificateFile, SSLCertificateKeyFile and SSLCertificateChainFile, if applicable.
    2. Replace the lines (near line #52 and #83) beginning with SSLCipherSuite, SSLProxyCipherSuite, SSLProtocol, and SSLProxyProtocol with the following:

       SSLCipherSuite ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256
       SSLProxyCipherSuite ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256
       
       SSLProtocol all -SSLv3 -TLSv1 -TLSv1.1
       SSLProxyProtocol all -SSLv3 -TLSv1 -TLSv1.1

    3. Uncomment the following line:

       SSLHonorCipherOrder on

    4. Add the following lines after the previous line:

       SSLCompression off 
       SSLSessionTickets off

    5. Add the following lines just before the <Virtualhost _default_:443> section:

       SSLUseStapling on
       SSLStaplingCache "shmcb:/run/httpd/ssl_stapling(32768)"

       In a large deployments, the 32868 value might need to be higher. Contact IXIASOFT for more information.
    6. Add the following line in the end of the file just before the </VirtualHost> line:

       Include conf.d/reverse-proxy.conf

11. Restart the Apache httpd service to apply changes:
    # systemctl restart httpd