ssh-keysign —
ssh helper program for host-based authentication
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
authentication.
- /etc/ssh/ssh_config
- Controls whether
ssh-keysign is enabled.
- /etc/ssh/ssh_host_dsa_key,
/etc/ssh/ssh_host_rsa_key
- 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.
- /etc/ssh/ssh_host_dsa_key-cert.pub,
/etc/ssh/ssh_host_rsa_key-cert.pub
- If these files exist they are assumed to contain public certificate
information corresponding with the private keys above.
ssh-keysign first appeared in OpenBSD
3.2.
Markus Friedl ⟨markus@openbsd.org⟩