Summary

As you can see, SSH servers have a tremendous number of configuration options, and in some cases, multiple ways to achieve the same results. All this power comes at a price, however. When setting up a secure system, it is vital to consider each option carefully and select appropriate values. Don't skimp on understanding: the security of your systems may depend on it. "A Recommended Setup" lists configurations for SSH1, SSH2, and OpenSSH. In addition, all the keywords and options in this chapter appear in Appendix B, "SSH Quick Reference".Remember that serverwide configuration is only one avenue for affecting server behavior. We discuss compile-time configuration in "Installation and Compile-Time Configuration" and per-account configuration in "Per-Account Server Configuration".