ssh-keysign is used by ssh(1) to access the local host keys and generate
     the digital signature required during host-based authentication with SSH
     protocol version 2.

     ssh-keysign is disabled by default and can only be enabled in the global
     client configuration file /etc/ssh/ssh_config by setting EnableSSHKeysign
     to ``yes''.

     ssh-keysign is not intended to be invoked by the user, but from ssh(1).
     See ssh(1) and sshd(8) for more information about host-based authentica-

             Controls whether ssh-keysign is enabled.

             These files contain the private parts of the host keys used to
             generate the digital signature.  They should be owned by root,
             readable only by root, and not accessible to others.  Since they
             are readable only by root, ssh-keysign must be set-uid root if
             host-based authentication is used.

             If these files exist they are assumed to contain public certifi-
             cate information corresponding with the private keys above.

     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)

     ssh-keysign first appeared in OpenBSD 3.2.

     Markus Friedl <>

BSD                              May 22, 2019                              BSD
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