diff options
Diffstat (limited to 'ssh-agent.0')
| -rw-r--r-- | ssh-agent.0 | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/ssh-agent.0 b/ssh-agent.0 new file mode 100644 index 0000000..f4575d0 --- /dev/null +++ b/ssh-agent.0 @@ -0,0 +1,120 @@ +SSH-AGENT(1) General Commands Manual SSH-AGENT(1) + +NAME + ssh-agent M-bM-^@M-^S authentication agent + +SYNOPSIS + ssh-agent [-c | -s] [-Dd] [-a bind_address] [-E fingerprint_hash] + [-P pkcs11_whitelist] [-t life] [command [arg ...]] + ssh-agent [-c | -s] -k + +DESCRIPTION + ssh-agent is a program to hold private keys used for public key + authentication (RSA, DSA, ECDSA, Ed25519). ssh-agent is usually 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 authentication when logging in to other machines + using ssh(1). + + The agent initially does not have any private keys. Keys are added using + ssh(1) (see AddKeysToAgent in ssh_config(5) for details) or ssh-add(1). + Multiple identities may be stored in ssh-agent concurrently and ssh(1) + will automatically use them if present. ssh-add(1) is also used to + remove keys from ssh-agent and to query the keys that are held in one. + + The options are as follows: + + -a bind_address + Bind the agent to the UNIX-domain socket bind_address. The + default is $TMPDIR/ssh-XXXXXXXXXX/agent.<ppid>. + + -c Generate C-shell commands on stdout. This is the default if + SHELL looks like it's a csh style of shell. + + -D Foreground mode. When this option is specified ssh-agent will + not fork. + + -d Debug mode. When this option is specified ssh-agent will not + fork and will write debug information to standard error. + + -E fingerprint_hash + Specifies the hash algorithm used when displaying key + fingerprints. Valid options are: M-bM-^@M-^\md5M-bM-^@M-^] and M-bM-^@M-^\sha256M-bM-^@M-^]. The + default is M-bM-^@M-^\sha256M-bM-^@M-^]. + + -k Kill the current agent (given by the SSH_AGENT_PID environment + variable). + + -P pkcs11_whitelist + Specify a pattern-list of acceptable paths for PKCS#11 shared + libraries that may be added using the -s option to ssh-add(1). + The default is to allow loading PKCS#11 libraries from + M-bM-^@M-^\/usr/lib/*,/usr/local/lib/*M-bM-^@M-^]. PKCS#11 libraries that do not + match the whitelist will be refused. See PATTERNS in + ssh_config(5) for a description of pattern-list syntax. + + -s Generate Bourne shell commands on stdout. This is the default if + SHELL does not look like it's a csh style of shell. + + -t life + Set a default value for the maximum lifetime of identities added + to the agent. The lifetime may be specified in seconds or in a + time format specified in sshd_config(5). A lifetime specified + for an identity with ssh-add(1) overrides this value. Without + this option the default maximum lifetime is forever. + + If a command line is given, this is executed as a subprocess of the + agent. When the command dies, so does 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. + + There are two main ways to get an agent set up: The first is that the + agent starts a new subcommand into which some environment variables are + exported, eg ssh-agent xterm &. The second is that the agent prints the + needed shell commands (either sh(1) or csh(1) syntax can be generated) + which can be evaluated in the calling shell, eg eval `ssh-agent -s` for + Bourne-type shells such as sh(1) or ksh(1) and eval `ssh-agent -c` for + csh(1) and derivatives. + + Later ssh(1) looks at these variables and uses them to establish a + connection to the agent. + + The agent will never send a private key over its request channel. + Instead, operations that require a private key will be performed by the + agent, and the result will be returned to the requester. This way, + private keys are not exposed to clients using the agent. + + A UNIX-domain socket is created and the name of this socket is stored in + the 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. + + The SSH_AGENT_PID environment variable holds the agent's process ID. + + The agent exits automatically when the command given on the command line + terminates. + +FILES + $TMPDIR/ssh-XXXXXXXXXX/agent.<ppid> + 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. + +SEE ALSO + ssh(1), ssh-add(1), ssh-keygen(1), sshd(8) + +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. + +OpenBSD 6.4 November 30, 2016 OpenBSD 6.4 |