cf783db152
$FreeBSD$ tags and man page dates. Add a post-merge script which reapplies these changes. Run both scripts to normalize the existing code base. As a result, many files which should have had $FreeBSD$ tags but didn't now have them. Partly rewrite the upgrade instructions and remove the now outdated list of tricks.
187 lines
6.2 KiB
Groff
187 lines
6.2 KiB
Groff
.ig \" -*- nroff -*-
|
|
Copyright (c) 1999-2013 hands.com Ltd. <http://hands.com/>
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
1. Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
2. Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
..
|
|
.Dd June 17, 2010
|
|
.Dt SSH-COPY-ID 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ssh-copy-id
|
|
.Nd use locally available keys to authorise logins on a remote machine
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl n
|
|
.Op Fl i Op Ar identity_file
|
|
.Op Fl p Ar port
|
|
.Op Fl o Ar ssh_option
|
|
.Op Ar user Ns @ Ns
|
|
.Ar hostname
|
|
.Nm
|
|
.Fl h | Fl ?
|
|
.br
|
|
.Sh DESCRIPTION
|
|
.Nm
|
|
is a script that uses
|
|
.Xr ssh 1
|
|
to log into a remote machine (presumably using a login password,
|
|
so password authentication should be enabled, unless you've done some
|
|
clever use of multiple identities). It assembles a list of one or more
|
|
fingerprints (as described below) and tries to log in with each key, to
|
|
see if any of them are already installed (of course, if you are not using
|
|
.Xr ssh-agent 1
|
|
this may result in you being repeatedly prompted for pass-phrases).
|
|
It then assembles a list of those that failed to log in, and using ssh,
|
|
enables logins with those keys on the remote server. By default it adds
|
|
the keys by appending them to the remote user's
|
|
.Pa ~/.ssh/authorized_keys
|
|
(creating the file, and directory, if necessary). It is also capable
|
|
of detecting if the remote system is a NetScreen, and using its
|
|
.Ql set ssh pka-dsa key ...
|
|
command instead.
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width Ds
|
|
.It Fl i Ar identity_file
|
|
Use only the key(s) contained in
|
|
.Ar identity_file
|
|
(rather than looking for identities via
|
|
.Xr ssh-add 1
|
|
or in the
|
|
.Ic default_ID_file ) .
|
|
If the filename does not end in
|
|
.Pa .pub
|
|
this is added. If the filename is omitted, the
|
|
.Ic default_ID_file
|
|
is used.
|
|
.Pp
|
|
Note that this can be used to ensure that the keys copied have the
|
|
comment one prefers and/or extra options applied, by ensuring that the
|
|
key file has these set as preferred before the copy is attempted.
|
|
.It Fl n
|
|
do a dry-run. Instead of installing keys on the remote system simply
|
|
prints the key(s) that would have been installed.
|
|
.It Fl h , Fl ?
|
|
Print Usage summary
|
|
.It Fl p Ar port , Fl o Ar ssh_option
|
|
These two options are simply passed through untouched, along with their
|
|
argument, to allow one to set the port or other
|
|
.Xr ssh 1
|
|
options, respectively.
|
|
.Pp
|
|
Rather than specifying these as command line options, it is often better to use (per-host) settings in
|
|
.Xr ssh 1 Ns 's
|
|
configuration file:
|
|
.Xr ssh_config 5 .
|
|
.El
|
|
.Pp
|
|
Default behaviour without
|
|
.Fl i ,
|
|
is to check if
|
|
.Ql ssh-add -L
|
|
provides any output, and if so those keys are used. Note that this results in
|
|
the comment on the key being the filename that was given to
|
|
.Xr ssh-add 1
|
|
when the key was loaded into your
|
|
.Xr ssh-agent 1
|
|
rather than the comment contained in that file, which is a bit of a shame.
|
|
Otherwise, if
|
|
.Xr ssh-add 1
|
|
provides no keys contents of the
|
|
.Ic default_ID_file
|
|
will be used.
|
|
.Pp
|
|
The
|
|
.Ic default_ID_file
|
|
is the most recent file that matches:
|
|
.Pa ~/.ssh/id*.pub ,
|
|
(excluding those that match
|
|
.Pa ~/.ssh/*-cert.pub )
|
|
so if you create a key that is not the one you want
|
|
.Nm
|
|
to use, just use
|
|
.Xr touch 1
|
|
on your preferred key's
|
|
.Pa .pub
|
|
file to reinstate it as the most recent.
|
|
.Pp
|
|
.Sh EXAMPLES
|
|
If you have already installed keys from one system on a lot of remote
|
|
hosts, and you then create a new key, on a new client machine, say,
|
|
it can be difficult to keep track of which systems on which you've
|
|
installed the new key. One way of dealing with this is to load both
|
|
the new key and old key(s) into your
|
|
.Xr ssh-agent 1 .
|
|
Load the new key first, without the
|
|
.Fl c
|
|
option, then load one or more old keys into the agent, possibly by
|
|
ssh-ing to the client machine that has that old key, using the
|
|
.Fl A
|
|
option to allow agent forwarding:
|
|
.Pp
|
|
.D1 user@newclient$ ssh-add
|
|
.D1 user@newclient$ ssh -A old.client
|
|
.D1 user@oldl$ ssh-add -c
|
|
.D1 No ... prompt for pass-phrase ...
|
|
.D1 user@old$ logoff
|
|
.D1 user@newclient$ ssh someserver
|
|
.Pp
|
|
now, if the new key is installed on the server, you'll be allowed in
|
|
unprompted, whereas if you only have the old key(s) enabled, you'll be
|
|
asked for confirmation, which is your cue to log back out and run
|
|
.Pp
|
|
.D1 user@newclient$ ssh-copy-id -i someserver
|
|
.Pp
|
|
The reason you might want to specify the -i option in this case is to
|
|
ensure that the comment on the installed key is the one from the
|
|
.Pa .pub
|
|
file, rather than just the filename that was loaded into you agent.
|
|
It also ensures that only the id you intended is installed, rather than
|
|
all the keys that you have in your
|
|
.Xr ssh-agent 1 .
|
|
Of course, you can specify another id, or use the contents of the
|
|
.Xr ssh-agent 1
|
|
as you prefer.
|
|
.Pp
|
|
Having mentioned
|
|
.Xr ssh-add 1 Ns 's
|
|
.Fl c
|
|
option, you might consider using this whenever using agent forwarding
|
|
to avoid your key being hijacked, but it is much better to instead use
|
|
.Xr ssh 1 Ns 's
|
|
.Ar ProxyCommand
|
|
and
|
|
.Fl W
|
|
option,
|
|
to bounce through remote servers while always doing direct end-to-end
|
|
authentication. This way the middle hop(s) don't get access to your
|
|
.Xr ssh-agent 1 .
|
|
A web search for
|
|
.Ql ssh proxycommand nc
|
|
should prove enlightening (N.B. the modern approach is to use the
|
|
.Fl W
|
|
option, rather than
|
|
.Xr nc 1 ) .
|
|
.Sh "SEE ALSO"
|
|
.Xr ssh 1 ,
|
|
.Xr ssh-agent 1 ,
|
|
.Xr sshd 8
|