$FreeBSD: head/crypto/openssh/ssh-add.1 263691 2014-03-24 19:15:13Z des $
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
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2. Redistributions in binary form must reproduce the above copyright
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.Dd December 7, 2013 .Dt SSH-ADD 1 .Os .Sh NAME .Nm ssh-add .Nd adds private key identities to the authentication agent .Sh SYNOPSIS .Nm ssh-add .Op Fl cDdkLlXx .Op Fl t Ar life .Op Ar .Nm ssh-add .Fl s Ar pkcs11 .Nm ssh-add .Fl e Ar pkcs11 .Sh DESCRIPTION .Nm adds private key identities to the authentication agent, .Xr ssh-agent 1 . When run without arguments, it adds the files
a ~/.ssh/id_ed25519 and
a ~/.ssh/identity . After loading a private key, .Nm will try to load corresponding certificate information from the filename obtained by appending
a -cert.pub to the name of the private key file. Alternative file names can be given on the command line.
p If any file requires a passphrase, .Nm asks for the passphrase from the user. The passphrase is read from the user's tty. .Nm retries the last passphrase if multiple identity files are given.
p The authentication agent must be running and the .Ev SSH_AUTH_SOCK environment variable must contain the name of its socket for .Nm to work.
p The options are as follows: l -tag -width Ds t Fl c Indicates that added identities should be subject to confirmation before being used for authentication. Confirmation is performed by the .Ev SSH_ASKPASS program mentioned below. Successful confirmation is signaled by a zero exit status from the .Ev SSH_ASKPASS program, rather than text entered into the requester. t Fl D Deletes all identities from the agent. t Fl d Instead of adding identities, removes identities from the agent. If .Nm has been run without arguments, the keys for the default identities and their corresponding certificates will be removed. Otherwise, the argument list will be interpreted as a list of paths to public key files to specify keys and certificates to be removed from the agent. If no public key is found at a given path, .Nm will append
a .pub and retry. t Fl e Ar pkcs11 Remove keys provided by the PKCS#11 shared library .Ar pkcs11 . t Fl k When loading keys into or deleting keys from the agent, process plain private keys only and skip certificates. t Fl L Lists public key parameters of all identities currently represented by the agent. t Fl l Lists fingerprints of all identities currently represented by the agent. t Fl s Ar pkcs11 Add keys provided by the PKCS#11 shared library .Ar pkcs11 . t Fl t Ar life Set a maximum lifetime when adding identities to an agent. The lifetime may be specified in seconds or in a time format specified in .Xr sshd_config 5 . t Fl X Unlock the agent. t Fl x Lock the agent with a password. .El .Sh ENVIRONMENT l -tag -width Ds t Ev "DISPLAY" and "SSH_ASKPASS" If .Nm needs a passphrase, it will read the passphrase from the current terminal if it was run from a terminal. If .Nm does not have a terminal associated with it but .Ev DISPLAY and .Ev SSH_ASKPASS are set, it will execute the program specified by .Ev SSH_ASKPASS and open an X11 window to read the passphrase. This is particularly useful when calling .Nm from a
a .xsession or related script. (Note that on some machines it may be necessary to redirect the input from
a /dev/null to make this work.) t Ev SSH_AUTH_SOCK Identifies the path of a x Ns -domain socket used to communicate with the agent. .El .Sh FILES l -tag -width Ds t Pa ~/.ssh/identity Contains the protocol version 1 RSA authentication identity of the user. t Pa ~/.ssh/id_dsa Contains the protocol version 2 DSA authentication identity of the user. t Pa ~/.ssh/id_ecdsa Contains the protocol version 2 ECDSA authentication identity of the user. t Pa ~/.ssh/id_ed25519 Contains the protocol version 2 ED25519 authentication identity of the user. t Pa ~/.ssh/id_rsa Contains the protocol version 2 RSA authentication identity of the user. .El
p Identity files should not be readable by anyone but the user. Note that .Nm ignores identity files if they are accessible by others. .Sh EXIT STATUS Exit status is 0 on success, 1 if the specified command fails, and 2 if .Nm is unable to contact the authentication agent. .Sh SEE ALSO .Xr ssh 1 , .Xr ssh-agent 1 , .Xr ssh-keygen 1 , .Xr sshd 8 .Sh AUTHORS OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen. Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos, Theo de Raadt and Dug Song removed many bugs, re-added newer features and created OpenSSH. Markus Friedl contributed the support for SSH protocol versions 1.5 and 2.0.