mirror of
git://anongit.mindrot.org/openssh.git
synced 2024-11-24 19:53:24 +08:00
e4340be5b3
- markus@cvs.openbsd.org 2000/09/05 02:59:57 [session.c] print hostname (not hushlogin) - markus@cvs.openbsd.org 2000/09/05 13:18:48 [authfile.c ssh-add.c] enable ssh-add -d for DSA keys - markus@cvs.openbsd.org 2000/09/05 13:20:49 [sftp-server.c] cleanup - markus@cvs.openbsd.org 2000/09/06 03:46:41 [authfile.h] prototype - deraadt@cvs.openbsd.org 2000/09/07 14:27:56 [ALL] cleanup copyright notices on all files. I have attempted to be accurate with the details. everything is now under Tatu's licence (which I copied from his readme), and/or the core-sdi bsd-ish thing for deattack, or various openbsd developers under a 2-term bsd licence. We're not changing any rules, just being accurate. - markus@cvs.openbsd.org 2000/09/07 14:40:30 [channels.c channels.h clientloop.c serverloop.c ssh.c] cleanup window and packet sizes for ssh2 flow control; ok niels - markus@cvs.openbsd.org 2000/09/07 14:53:00 [scp.c] typo - markus@cvs.openbsd.org 2000/09/07 15:13:37 [auth-options.c auth-options.h auth-rh-rsa.c auth-rsa.c auth.c] [authfile.h canohost.c channels.h compat.c hostfile.h log.c match.h] [pty.c readconf.c] some more Copyright fixes - markus@cvs.openbsd.org 2000/09/08 03:02:51 [README.openssh2] bye bye - deraadt@cvs.openbsd.org 2000/09/11 18:38:33 [LICENCE cipher.c] a few more comments about it being ARC4 not RC4 - markus@cvs.openbsd.org 2000/09/12 14:53:11 [log-client.c log-server.c log.c ssh.1 ssh.c ssh.h sshd.8 sshd.c] multiple debug levels - markus@cvs.openbsd.org 2000/09/14 14:25:15 [clientloop.c] typo - deraadt@cvs.openbsd.org 2000/09/15 01:13:51 [ssh-agent.c] check return value for setenv(3) for failure, and deal appropriately
195 lines
6.3 KiB
Groff
195 lines
6.3 KiB
Groff
.\" $OpenBSD: ssh-agent.1,v 1.16 2000/09/07 20:27:54 deraadt Exp $
|
|
.\"
|
|
.\" Author: Tatu Ylonen <ylo@cs.hut.fi>
|
|
.\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
|
|
.\" All rights reserved
|
|
.\"
|
|
.\" As far as I am concerned, the code I have written for this software
|
|
.\" can be used freely for any purpose. Any derived versions of this
|
|
.\" software must be clearly marked as such, and if the derived work is
|
|
.\" incompatible with the protocol description in the RFC file, it must be
|
|
.\" called by a name other than "ssh" or "Secure Shell".
|
|
.\"
|
|
.\" Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
|
|
.\" Copyright (c) 1999 Aaron Campbell. All rights reserved.
|
|
.\" Copyright (c) 1999 Theo de Raadt. All rights reserved.
|
|
.\"
|
|
.\" 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 September 25, 1999
|
|
.Dt SSH-AGENT 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ssh-agent
|
|
.Nd authentication agent
|
|
.Sh SYNOPSIS
|
|
.Nm ssh-agent
|
|
.Op Fl c Li | Fl s
|
|
.Op Fl k
|
|
.Oo
|
|
.Ar command
|
|
.Op Ar args ...
|
|
.Oc
|
|
.Sh DESCRIPTION
|
|
.Nm
|
|
is a program to hold private keys used for public key authentication
|
|
(RSA, DSA).
|
|
The idea is that
|
|
.Nm
|
|
is started in the beginning of an X-session or a login session, and
|
|
all other windows or programs are started as clients to the ssh-agent
|
|
program.
|
|
Through use of environment variables the agent can be located
|
|
and automatically used for authentication when logging in to other
|
|
machines using
|
|
.Xr ssh 1 .
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width Ds
|
|
.It Fl c
|
|
Generate C-shell commands on
|
|
.Dv stdout .
|
|
This is the default if
|
|
.Ev SHELL
|
|
looks like it's a csh style of shell.
|
|
.It Fl s
|
|
Generate Bourne shell commands on
|
|
.Dv stdout .
|
|
This is the default if
|
|
.Ev SHELL
|
|
does not look like it's a csh style of shell.
|
|
.It Fl k
|
|
Kill the current agent (given by the
|
|
.Ev SSH_AGENT_PID
|
|
environment variable).
|
|
.El
|
|
.Pp
|
|
If a commandline is given, this is executed as a subprocess of the agent.
|
|
When the command dies, so does the agent.
|
|
.Pp
|
|
The agent initially does not have any private keys.
|
|
Keys are added using
|
|
.Xr ssh-add 1 .
|
|
When executed without arguments,
|
|
.Xr ssh-add 1
|
|
adds the
|
|
.Pa $HOME/.ssh/identity
|
|
file.
|
|
If the identity has a passphrase,
|
|
.Xr ssh-add 1
|
|
asks for the passphrase (using a small X11 application if running
|
|
under X11, or from the terminal if running without X).
|
|
It then sends the identity to the agent.
|
|
Several identities can be stored in the
|
|
agent; the agent can automatically use any of these identities.
|
|
.Ic ssh-add -l
|
|
displays the identities currently held by the agent.
|
|
.Pp
|
|
The idea is that the agent is run in the user's local PC, laptop, or
|
|
terminal.
|
|
Authentication data need not be stored on any other
|
|
machine, and authentication passphrases never go over the network.
|
|
However, the connection to the agent is forwarded over SSH
|
|
remote logins, and the user can thus use the privileges given by the
|
|
identities anywhere in the network in a secure way.
|
|
.Pp
|
|
There are two main ways to get an agent setup:
|
|
Either you let the agent
|
|
start a new subcommand into which some environment variables are exported, or
|
|
you let the agent print the needed shell commands (either
|
|
.Xr sh 1
|
|
or
|
|
.Xr csh 1
|
|
syntax can be generated) which can be evalled in the calling shell.
|
|
Later
|
|
.Xr ssh 1
|
|
look at these variables and use them to establish a connection to the agent.
|
|
.Pp
|
|
A unix-domain socket is created
|
|
.Pq Pa /tmp/ssh-XXXXXXXX/agent.<pid> ,
|
|
and the name of this socket is stored in the
|
|
.Ev SSH_AUTH_SOCK
|
|
environment
|
|
variable.
|
|
The socket is made accessible only to the current user.
|
|
This method is easily abused by root or another instance of the same
|
|
user.
|
|
.Pp
|
|
The
|
|
.Ev SSH_AGENT_PID
|
|
environment variable holds the agent's PID.
|
|
.Pp
|
|
The agent exits automatically when the command given on the command
|
|
line terminates.
|
|
.Sh FILES
|
|
.Bl -tag -width Ds
|
|
.It Pa $HOME/.ssh/identity
|
|
Contains the RSA authentication identity of the user.
|
|
This file should not be readable by anyone but the user.
|
|
It is possible to
|
|
specify a passphrase when generating the key; that passphrase will be
|
|
used to encrypt the private part of this file.
|
|
This file is not used by
|
|
.Nm
|
|
but is normally added to the agent using
|
|
.Xr ssh-add 1
|
|
at login time.
|
|
.It Pa $HOME/.ssh/id_dsa
|
|
Contains the DSA authentication identity of the user.
|
|
.Pq Pa /tmp/ssh-XXXXXXXX/agent.<pid> ,
|
|
Unix-domain sockets used to contain the connection to the
|
|
authentication agent.
|
|
These sockets should only be readable by the owner.
|
|
The sockets should get automatically removed when the agent exits.
|
|
.El
|
|
.Sh AUTHOR
|
|
Tatu Ylonen <ylo@cs.hut.fi>
|
|
.Pp
|
|
OpenSSH
|
|
is a derivative of the original (free) ssh 1.2.12 release, but with bugs
|
|
removed and newer features re-added.
|
|
Rapidly after the 1.2.12 release,
|
|
newer versions bore successively more restrictive licenses.
|
|
This version of OpenSSH
|
|
.Bl -bullet
|
|
.It
|
|
has all components of a restrictive nature (i.e., patents, see
|
|
.Xr crypto 3 )
|
|
directly removed from the source code; any licensed or patented components
|
|
are chosen from
|
|
external libraries.
|
|
.It
|
|
has been updated to support ssh protocol 1.5.
|
|
.It
|
|
contains added support for
|
|
.Xr kerberos 8
|
|
authentication and ticket passing.
|
|
.It
|
|
supports one-time password authentication with
|
|
.Xr skey 1 .
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr ssh 1 ,
|
|
.Xr ssh-add 1 ,
|
|
.Xr ssh-keygen 1 ,
|
|
.Xr sshd 8 ,
|
|
.Xr crypto 3
|