271dcc6a42
This completely removes client-side support for the SSH 1 protocol, which was already disabled in 12 but is still enabled in 11. For that reason, we will not be able to merge 7.6p1 or newer back to 11.
212 lines
6.5 KiB
Groff
212 lines
6.5 KiB
Groff
.\" $OpenBSD: ssh-add.1,v 1.66 2017/08/29 13:05:58 jmc Exp $
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.\"
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.\" Author: Tatu Ylonen <ylo@cs.hut.fi>
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.\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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.\" All rights reserved
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.\"
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.\" As far as I am concerned, the code I have written for this software
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.\" can be used freely for any purpose. Any derived versions of this
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.\" software must be clearly marked as such, and if the derived work is
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.\" incompatible with the protocol description in the RFC file, it must be
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.\" called by a name other than "ssh" or "Secure Shell".
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.\"
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.\"
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.\" Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
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.\" Copyright (c) 1999 Aaron Campbell. All rights reserved.
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.\" Copyright (c) 1999 Theo de Raadt. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd $Mdocdate: August 29 2017 $
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.Dt SSH-ADD 1
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.Os
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.Sh NAME
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.Nm ssh-add
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.Nd adds private key identities to the authentication agent
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.Sh SYNOPSIS
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.Nm ssh-add
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.Op Fl cDdkLlqXx
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.Op Fl E Ar fingerprint_hash
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.Op Fl t Ar life
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.Op Ar
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.Nm ssh-add
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.Fl s Ar pkcs11
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.Nm ssh-add
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.Fl e Ar pkcs11
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.Sh DESCRIPTION
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.Nm
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adds private key identities to the authentication agent,
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.Xr ssh-agent 1 .
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When run without arguments, it adds the files
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.Pa ~/.ssh/id_rsa ,
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.Pa ~/.ssh/id_dsa ,
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.Pa ~/.ssh/id_ecdsa ,
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and
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.Pa ~/.ssh/id_ed25519 .
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After loading a private key,
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.Nm
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will try to load corresponding certificate information from the
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filename obtained by appending
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.Pa -cert.pub
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to the name of the private key file.
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Alternative file names can be given on the command line.
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.Pp
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If any file requires a passphrase,
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.Nm
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asks for the passphrase from the user.
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The passphrase is read from the user's tty.
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.Nm
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retries the last passphrase if multiple identity files are given.
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.Pp
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The authentication agent must be running and the
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.Ev SSH_AUTH_SOCK
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environment variable must contain the name of its socket for
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.Nm
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to work.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl c
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Indicates that added identities should be subject to confirmation before
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being used for authentication.
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Confirmation is performed by
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.Xr ssh-askpass 1 .
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Successful confirmation is signaled by a zero exit status from
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.Xr ssh-askpass 1 ,
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rather than text entered into the requester.
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.It Fl D
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Deletes all identities from the agent.
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.It Fl d
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Instead of adding identities, removes identities from the agent.
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If
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.Nm
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has been run without arguments, the keys for the default identities and
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their corresponding certificates will be removed.
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Otherwise, the argument list will be interpreted as a list of paths to
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public key files to specify keys and certificates to be removed from the agent.
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If no public key is found at a given path,
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.Nm
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will append
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.Pa .pub
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and retry.
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.It Fl E Ar fingerprint_hash
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Specifies the hash algorithm used when displaying key fingerprints.
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Valid options are:
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.Dq md5
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and
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.Dq sha256 .
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The default is
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.Dq sha256 .
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.It Fl e Ar pkcs11
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Remove keys provided by the PKCS#11 shared library
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.Ar pkcs11 .
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.It Fl k
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When loading keys into or deleting keys from the agent, process plain private
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keys only and skip certificates.
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.It Fl L
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Lists public key parameters of all identities currently represented
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by the agent.
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.It Fl l
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Lists fingerprints of all identities currently represented by the agent.
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.It Fl q
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Be quiet after a successful operation.
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.It Fl s Ar pkcs11
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Add keys provided by the PKCS#11 shared library
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.Ar pkcs11 .
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.It Fl t Ar life
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Set a maximum lifetime when adding identities to an agent.
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The lifetime may be specified in seconds or in a time format
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specified in
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.Xr sshd_config 5 .
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.It Fl X
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Unlock the agent.
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.It Fl x
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Lock the agent with a password.
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.El
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.Sh ENVIRONMENT
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.Bl -tag -width Ds
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.It Ev "DISPLAY" and "SSH_ASKPASS"
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If
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.Nm
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needs a passphrase, it will read the passphrase from the current
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terminal if it was run from a terminal.
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If
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.Nm
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does not have a terminal associated with it but
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.Ev DISPLAY
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and
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.Ev SSH_ASKPASS
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are set, it will execute the program specified by
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.Ev SSH_ASKPASS
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(by default
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.Dq ssh-askpass )
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and open an X11 window to read the passphrase.
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This is particularly useful when calling
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.Nm
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from a
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.Pa .xsession
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or related script.
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(Note that on some machines it
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may be necessary to redirect the input from
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.Pa /dev/null
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to make this work.)
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.It Ev SSH_AUTH_SOCK
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Identifies the path of a
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.Ux Ns -domain
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socket used to communicate with the agent.
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.El
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.Sh FILES
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.Bl -tag -width Ds
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.It Pa ~/.ssh/id_dsa
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Contains the DSA authentication identity of the user.
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.It Pa ~/.ssh/id_ecdsa
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Contains the ECDSA authentication identity of the user.
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.It Pa ~/.ssh/id_ed25519
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Contains the Ed25519 authentication identity of the user.
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.It Pa ~/.ssh/id_rsa
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Contains the RSA authentication identity of the user.
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.El
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.Pp
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Identity files should not be readable by anyone but the user.
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Note that
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.Nm
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ignores identity files if they are accessible by others.
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.Sh EXIT STATUS
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Exit status is 0 on success, 1 if the specified command fails,
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and 2 if
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.Nm
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is unable to contact the authentication agent.
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.Sh SEE ALSO
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.Xr ssh 1 ,
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.Xr ssh-agent 1 ,
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.Xr ssh-askpass 1 ,
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.Xr ssh-keygen 1 ,
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.Xr sshd 8
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.Sh AUTHORS
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OpenSSH is a derivative of the original and free
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ssh 1.2.12 release by Tatu Ylonen.
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Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
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Theo de Raadt and Dug Song
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removed many bugs, re-added newer features and
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created OpenSSH.
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Markus Friedl contributed the support for SSH
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protocol versions 1.5 and 2.0.
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