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dropbear
Langue: en
Version: 385401 (fedora - 01/12/10)
Section: 8 (Commandes administrateur)
NAME
dropbear - lightweight SSH2 serverSYNOPSIS
dropbear [-FEmwsgjki] [-b banner] [-d dsskey] [-r rsakey] [-p port]DESCRIPTION
dropbear is a SSH 2 server designed to be small enough to be used in small memory environments, while still being functional and secure enough for general use.OPTIONS
- -b banner
- bannerfile. Display the contents of the file banner before user login (default: none).
- -d dsskey
- dsskeyfile. Use the contents of the file dsskey for the DSS host key (default: /etc/dropbear/dropbear_dss_host_key). Note that some SSH implementations use the term "DSA" rather than "DSS", they mean the same thing. This file is generated with dropbearkey(8).
- -r rsakey
- rsakeyfile. Use the contents of the file rsakey for the rsa host key (default: /etc/dropbear/dropbear_rsa_host_key). This file is generated with dropbearkey(8).
- -F
- Don't fork into background.
- -E
- Log to standard error rather than syslog.
- -m
- Don't display the message of the day on login.
- -w
- Disallow root logins.
- -s
- Disable password logins.
- -g
- Disable password logins for root.
- -j
- Disable local port forwarding.
- -k
- Disable remote port forwarding.
- -p [address:]port
- Listen on specified address and TCP port. If just a port is given listen on all addresses. up to 10 can be specified (default 22 if none specified).
- -i
- Service program mode. Use this option to run dropbear under TCP/IP servers like inetd, tcpsvd, or tcpserver. In program mode the -F option is implied, and -p options are ignored.
- -P pidfile
- Specify a pidfile to create when running as a daemon. If not specified, the default is /var/run/dropbear.pid
- -a
- Allow remote hosts to connect to forwarded ports.
- -W windowsize
- Specify the per-channel receive window buffer size. Increasing this may improve network performance at the expense of memory use. Use -h to see the default buffer size.
- -K timeout_seconds
- Ensure that traffic is transmitted at a certain interval in seconds. This is useful for working around firewalls or routers that drop connections after a certain period of inactivity. The trade-off is that a session may be closed if there is a temporary lapse of network connectivity. A setting if 0 disables keepalives.
- -I idle_timeout
- Disconnect the session if no traffic is transmitted or received for idle_timeout seconds.
FILES
- Authorized Keys
-
~/.ssh/authorized_keys can be set up to allow remote login with a RSA or DSS key. Each line is of the form
- [restrictions] ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIgAsp... [comment]
-
and can be extracted from a Dropbear private host key with "dropbearkey -y". This is the same format as used by OpenSSH, though the restrictions are a subset (keys with unknown restrictions are ignored). Restrictions are comma separated, with double quotes around spaces in arguments. Available restrictions are:
- no-port-forwarding
- Don't allow port forwarding for this connection
- no-agent-forwarding
- Don't allow agent forwarding for this connection
- no-X11-forwarding
- Don't allow X11 forwarding for this connection
- no-pty
- Disable PTY allocation. Note that a user can still obtain most of the same functionality with other means even if no-pty is set.
- command=forced_command
- Disregard the command provided by the user and always run forced_command.
The authorized_keys file and its containing ~/.ssh directory must only be writable by the user, otherwise Dropbear will not allow a login using public key authentication.
- Host Key Files
-
Host key files are read at startup from a standard location, by default /etc/dropbear/dropbear_dss_host_key and /etc/dropbear/dropbear_rsa_host_key or specified on the commandline with -d or -r. These are of the form generated by dropbearkey.
- Message Of The Day
-
By default the file /etc/motd will be printed for any login shell (unless disabled at compile-time). This can also be disabled per-user by creating a file ~/.hushlogin .
AUTHOR
Matt Johnston (matt@ucc.asn.au).Gerrit Pape (pape@smarden.org) wrote this manual page.
SEE ALSO
dropbearkey(8), dbclient(1) http://matt.ucc.asn.au/dropbear/dropbear.htmlContenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre