path: root/ssh-agent.1
diff options
authorDamien Miller <>1999-10-28 14:03:14 +1000
committerDamien Miller <>1999-10-28 14:03:14 +1000
commit062307657e30c9b970514eb53b4b743f9d571231 (patch)
tree04b1d6b094442720b4197eb442ee53c010cdc1d7 /ssh-agent.1
parent7f6ea0264d01aa40b20df8dc75141631479da054 (diff)
Big rename ssh* -> openssh*
Diffstat (limited to 'ssh-agent.1')
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-.\" -*- nroff -*-
-.\" ssh-agent.1
-.\" Author: Tatu Ylonen <>
-.\" Copyright (c) 1995 Tatu Ylonen <>, Espoo, Finland
-.\" All rights reserved
-.\" Created: Sat Apr 23 20:10:43 1995 ylo
-.\" $Id: ssh-agent.1,v 1.1 1999/10/27 03:42:45 damien Exp $
-.Dd September 25, 1999
-.Nm ssh-agent
-.Nd authentication agent
-.Nm ssh-agent
-.Ar command
-is a program to hold authentication private keys. The
-idea is that
-is started in the beginning of an X-session or a login session, and
-all other windows or programs are started as children of the ssh-agent
-program (the
-.Ar command
-normally starts X or is the user shell). Programs started under
-the agent inherit a connection to the agent, and the agent is
-automatically used for RSA authentication when logging to other
-machines using
-.Xr ssh 1 .
-The agent initially does not have any private keys. Keys are added
-.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.
-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.
-A connection to the agent is inherited by child programs:
-A unix-domain socket is created
-.Pq Pa /tmp/ssh-XXXX/agent.<pid> ,
-and the name of this socket is stored in the
-variable. The socket is made accessible only to the current user.
-This method is easily abused by root or another instance of the same
-The agent exits automatically when the command given on the command
-line terminates.
-.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
-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
-Tatu Ylonen <>
-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
-has all components of a restrictive nature (ie. patents, see
-.Xr ssl 8 )
-directly removed from the source code; any licensed or patented components
-are chosen from
-external libraries.
-has been updated to support ssh protocol 1.5.
-contains added support for
-.Xr kerberos 8
-authentication and ticket passing.
-supports one-time password authentication with
-.Xr skey 1 .
-The libraries described in
-.Xr ssl 8
-are required for proper operation.
-.Xr ssh 1 ,
-.Xr ssh-add 1 ,
-.Xr ssh-keygen 1 ,
-.Xr sshd 8 ,
-.Xr ssl 8