apache-diffie-hellman.rst
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| r1 | .. _dh-apache: | |||
| Diffie-Hellman Security | ||||
| ----------------------- | ||||
| To secure your web server, the `Guide to Deploying Diffie-Hellman for TLS`_ | ||||
| contains important information worth reading. This link contains some good | ||||
| `secure Apache configuration`_ examples. | ||||
| To secure your deployment of Diffie-Hellman, configure the following: | ||||
| 1. Generate a strong Diffie-hellman group, 2048-bit or stronger. | ||||
| .. code-block:: bash | ||||
| # to generate your dhparam.pem file, run in the terminal | ||||
| openssl dhparam -out /etc/apache/ssl/dhparam.pem 2048 | ||||
| 2. Configure your server to only use modern, secure cipher suites in the | ||||
| virtual hosts configuration file. | ||||
| .. code-block:: apache | ||||
| # Set the protocol to only use modern, secure cipher suites. | ||||
| SSLProtocol all -SSLv2 -SSLv3 | ||||
| SSLHonorCipherOrder on | ||||
| SSLCipherSuite ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA | ||||
| # Specify your DH params file as follows | ||||
| SSLOpenSSLConfCmd DHParameters "{path to dhparams.pem}" | ||||
| .. _Guide to Deploying Diffie-Hellman for TLS: https://weakdh.org/sysadmin.html | ||||
| .. _secure Apache configuration: http://www.apache-ssl.org/httpd.conf.example | ||||
