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authorSkyperTHC2026-03-03 06:28:55 +0000
committerSkyperTHC2026-03-03 06:28:55 +0000
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1
2SSH-AGENT(1) System Reference Manual SSH-AGENT(1)
3
4NAME
5 ssh-agent - authentication agent
6
7SYNOPSIS
8 ssh-agent command args ...
9 ssh-agent [-c | -s]
10 ssh-agent -k
11
12DESCRIPTION
13 ssh-agent is a program to hold private keys used for public key authentiM--
14 cation (RSA, DSA). The idea is that ssh-agent is started in the beginM--
15 ning of an X-session or a login session, and all other windows or proM--
16 grams are started as clients to the ssh-agent program. Through use of
17 environment variables the agent can be located and automatically used for
18 authentication when logging in to other machines using ssh(1).
19
20 The options are as follows:
21
22 -c Generate C-shell commands on stdout. This is the default if SHELL
23 looks like it's a csh style of shell.
24
25 -s Generate Bourne shell commands on stdout. This is the default if
26 SHELL does not look like it's a csh style of shell.
27
28 -k Kill the current agent (given by the SSH_AGENT_PID environment
29 variable).
30
31 If a commandline is given, this is executed as a subprocess of the agent.
32 When the command dies, so does the agent.
33
34 The agent initially does not have any private keys. Keys are added using
35 ssh-add(1). When executed without arguments, ssh-add(1) adds the
36 $HOME/.ssh/identity file. If the identity has a passphrase, ssh-add(1)
37 asks for the passphrase (using a small X11 application if running under
38 X11, or from the terminal if running without X). It then sends the idenM--
39 tity to the agent. Several identities can be stored in the agent; the
40 agent can automatically use any of these identities. ssh-add -l displays
41 the identities currently held by the agent.
42
43 The idea is that the agent is run in the user's local PC, laptop, or terM--
44 minal. Authentication data need not be stored on any other machine, and
45 authentication passphrases never go over the network. However, the conM--
46 nection to the agent is forwarded over SSH remote logins, and the user
47 can thus use the privileges given by the identities anywhere in the netM--
48 work in a secure way.
49
50 There are two main ways to get an agent setup: Either you let the agent
51 start a new subcommand into which some environment variables are exportM--
52 ed, or you let the agent print the needed shell commands (either sh(1) or
53 csh(1) syntax can be generated) which can be evalled in the calling
54 shell. Later ssh(1) looks at these variables and uses them to establish
55 a connection to the agent.
56
57 A unix-domain socket is created (/tmp/ssh-XXXXXXXX/agent.<pid>), and the
58 name of this socket is stored in the SSH_AUTH_SOCK environment variable.
59 The socket is made accessible only to the current user. This method is
60 easily abused by root or another instance of the same user.
61
62 The SSH_AGENT_PID environment variable holds the agent's PID.
63
64 The agent exits automatically when the command given on the command line
65 terminates.
66
67FILES
68 $HOME/.ssh/identity
69 Contains the protocol version 1 RSA authentication identity of
70 the user. This file should not be readable by anyone but the usM--
71 er. It is possible to specify a passphrase when generating the
72 key; that passphrase will be used to encrypt the private part of
73 this file. This file is not used by ssh-agent but is normally
74 added to the agent using ssh-add(1) at login time.
75
76 $HOME/.ssh/id_dsa
77 Contains the protocol version 2 DSA authentication identity of
78 the user.
79
80 $HOME/.ssh/id_rsa
81 Contains the protocol version 2 RSA authentication identity of
82 the user.
83
84 /tmp/ssh-XXXXXXXX/agent.<pid>
85 Unix-domain sockets used to contain the connection to the authenM--
86 tication agent. These sockets should only be readable by the
87 owner. The sockets should get automatically removed when the
88 agent exits.
89
90AUTHORS
91 OpenSSH is a derivative of the original and free ssh 1.2.12 release by
92 Tatu Ylonen. Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos, Theo
93 de Raadt and Dug Song removed many bugs, re-added newer features and creM--
94 ated OpenSSH. Markus Friedl contributed the support for SSH protocol
95 versions 1.5 and 2.0.
96
97SEE ALSO
98 ssh(1), ssh-add(1), ssh-keygen(1), sshd(8)
99
100BSD Experimental September 25, 1999 2