src/usr.bin/ssh/ssh_config.5 - diff

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Diff for /src/usr.bin/ssh/ssh_config.5 between version 1.338 and 1.339

version 1.338, 2020/10/16 14:34:33

version 1.339, 2020/12/22 00:15:23

Line 1121

.Pp

The list of available key exchange algorithms may also be obtained using

.Qq ssh -Q kex .

.It Cm KnownHostsCommand

Specifies a command to use to obtain a list of host keys, additional to

those listed in

.Cm UserKnownHostsFile

and

.Cm GlobalKnownHostsFile .

This command is executed after the files have been read.

It may write host keys lines to standard output in identical format to the

usual files (described in the

.Sx VERIFYING HOST KEYS

section in

.Xr ssh 1 ) .

Arguments to

.Cm KnownHostsCommand

accept the tokens described in the

.Sx TOKENS

section.

The command may be invoked multiple times per connection: when preparing

the preference list of host key algorithms to use, again to obtain the

host key for the requested host name and, if

.Cm CheckHostIP

is enabled, one more time to obtain the host key matching the server's

address.

If the command exits abnormally or returns a non-zero exit status then the

connection is terminated.

.It Cm LocalCommand

Specifies a command to execute on the local machine after successfully

connecting to the server.

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Hash of %l%h%p%r.

.It %d

Local user's home directory.

.It %f

The fingerprint of the server's host key.

.It %H

The

.Pa known_hosts

hostname or address that is being searched for.

.It %h

The remote hostname.

.It %I

A string describing the reason for a

.Cm KnownHostsCommand

execution; either

.Cm "ADDRESS"

when looking up a host by address (only when

.Cm CheckHostIP

is enabled),

.Cm "HOSTNAME"

when searching by hostname or

.Cm "ORDER"

when preparing the host key algorithm preference list to use for the

destination host.

.It %i

The local user ID.

.It %K

The base64 encoded host key.

.It %k

The host key alias if specified, otherwise the orignal remote hostname given

on the command line.

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tunnel forwarding was requested, or

.Qq NONE

otherwise.

.It %t

The type of the server host key, e.g.

.Cm ssh-ed25519

.It %u

The local username.

.El

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.Cm ControlPath ,

.Cm IdentityAgent ,

.Cm IdentityFile ,

.Cm KnownHostsCommand ,

.Cm LocalForward ,

.Cm Match exec ,

.Cm RemoteCommand ,

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.Cm UserKnownHostsFile

accept the tokens %%, %C, %d, %h, %i, %L, %l, %n, %p, %r, and %u.

.Pp

.Cm KnownHostsCommand

additionally accepts the tokens %f, %H, %I, %K and %t.

.Pp

.Cm Hostname

accepts the tokens %% and %h.

.Pp

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.Cm ControlPath ,

.Cm IdentityAgent ,

.Cm IdentityFile

.Cm KnownHostsCommand ,

and

.Cm UserKnownHostsFile

support environment variables.