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-.\" $OpenBSD: ssh-agent.1,v 1.12 2000/05/03 18:04:39 markus Exp $
-.\"
-.\"  -*- nroff -*-
-.\"
-.\" ssh-agent.1
-.\"
-.\" Author: Tatu Ylonen <ylo@cs.hut.fi>
-.\"
-.\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
-.\"                    All rights reserved
-.\"
-.\" Created: Sat Apr 23 20:10:43 1995 ylo
-.\"
-.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 RSA authentication.
-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 RSA 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 /tmp/ssh-XXXX/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.
-.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 ssl 8 )
-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
-.Pp
-The libraries described in
-.Xr ssl 8
-are required for proper operation.
-.Sh SEE ALSO
-.Xr ssh 1 ,
-.Xr ssh-add 1 ,
-.Xr ssh-keygen 1 ,
-.Xr sshd 8 ,
-.Xr ssl 8