1SSH-KEYSIGN(8)            BSD System Manager's Manual           SSH-KEYSIGN(8)
2

NAME

4     ssh-keysign — OpenSSH helper for host-based authentication
5

SYNOPSIS

7     ssh-keysign
8

DESCRIPTION

10     ssh-keysign is used by ssh(1) to access the local host keys and generate
11     the digital signature required during host-based authentication.
12
13     ssh-keysign is disabled by default and can only be enabled in the global
14     client configuration file /etc/gsissh/ssh_config by setting
15     EnableSSHKeysign to “yes”.
16
17     ssh-keysign is not intended to be invoked by the user, but from ssh(1).
18     See ssh(1) and sshd(8) for more information about host-based authentica‐
19     tion.
20

FILES

22     /etc/gsissh/ssh_config
23             Controls whether ssh-keysign is enabled.
24
25     /etc/gsissh/ssh_host_dsa_key
26     /etc/gsissh/ssh_host_ecdsa_key
27     /etc/gsissh/ssh_host_ed25519_key
28     /etc/gsissh/ssh_host_rsa_key
29             These files contain the private parts of the host keys used to
30             generate the digital signature.  They should be owned by root,
31             readable only by root, and not accessible to others.  Since they
32             are readable only by root, ssh-keysign must be set-uid root if
33             host-based authentication is used.
34
35     /etc/gsissh/ssh_host_dsa_key-cert.pub
36     /etc/gsissh/ssh_host_ecdsa_key-cert.pub
37     /etc/gsissh/ssh_host_ed25519_key-cert.pub
38     /etc/gsissh/ssh_host_rsa_key-cert.pub
39             If these files exist, they are assumed to contain public certifi‐
40             cate information corresponding with the private keys above.
41

SEE ALSO

43     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)
44

HISTORY

46     ssh-keysign first appeared in OpenBSD 3.2.
47

AUTHORS

49     Markus Friedl <markus@openbsd.org>
50
51BSD                             March 31, 2022                             BSD