README.ssl
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- As of vsftpd version 2.0.0, SSL / TLS support is provided.
- The SSL / TLS support provides the ability to encrypt FTP logins and subsequent
- commands, as well as the data transfers themselves. The encyption will, for
- example, stop the stealing of sensitive passwords via network snooping.
- By default, SSL support is disabled both at compile time and at runtime.
- Before considering enabling / using SSL support, there are some security
- considerations:
- - Only enable SSL if absolutely necessary. Enabling SSL will allow attackers
- to make use of any security problems in the OpenSSL libraries. Note that
- the OpenSSL libraries are a large quantity of code and have had the occasional
- security problem in the past.
- For example, your server might use virtual users to control access to
- non-sensitive download content. In this case, the passwords might not be
- worth securing with SSL.
- - After enabling SSL, consider restricting access to an SSL enabled server
- where feasible. For example, only the internal network might need access.
- In order to enable and use SSL support, you need the following:
- - vsftpd built with OpenSSL support. This is a decision your vsftpd packager
- made, or if you are building vsftpd yourself, edit "builddefs.h" and change the
- "#undef VSF_BUILD_SSL" to "#define VSF_BUILD_SSL".
- - "ssl_enable=YES" in your vsftpd.conf.
- - A SSL certificate. By default, an RSA certificate is looked for at the
- location /usr/share/ssl/certs/vsftpd.pem. To get an RSA certificate, either
- buy one from a certificate authority, or you can create your own self-signed
- certificate. If you have OpenSSL installed, you may find a "Makefile" in
- your shared certificates directory, e.g. /usr/share/ssl/certs. In that case,
- go to that directory and type e.g. "make vsftpd.pem". Then answer the
- questions you are asked. Alternatively, read the man page for "openssl".
- - Also be aware of the following SSL related parameters. Read the vsftpd.conf.5
- manual page to learn about them: allow_anon_ssl, force_local_logins_ssl,
- force_local_data_ssl, ssl_sslv2, ssl_sslv3, ssl_tlsv1, rsa_cert_file,
- dsa_cert_file, ssl_ciphers.