Openssh
The OpenSSH server can authenticate users using the standard methods supported by the ssh protocol: with a password; public-key authentication, using per-user keys; host-based authentication, which is a secure version of rlogin's host trust relationships using public keys; keyboard-interactive, a generic challenge–response mechanism, which is often used for simple password authentication, but which can also make use of stronger authenticators such as tokens; and Kerberos/GSSAPI. The server makes use of authentication methods native to the host operating system; this can include using the BSD Authentication system or Pluggable authentication modules (PAM) to enable additional authentication through methods such as one-time passwords. However, this occasionally has side effects: when using PAM with OpenSSH, it must be run as root, as root privileges are typically required to operate PAM. OpenSSH versions after 3. 7 (16 September 2003) allow PAM to be disabled at run-time, so regular users can run sshd instances.
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