DROPBEAR(8) System Manager's Manual DROPBEAR(8) (NAME) dropbear - SSH (SYNOPSIS) dropbear [flag arguments] [-b banner] [-r hostkeyfile] [-p [address:]port] (DESCRIPTION) dropbear SSH . (OPTIONS) -b banner . banner (: ). -r hostkey hostkey SSH. dropbearkey(1) -R . " (Host Key Files)" . -R . " (Host Key Files)" . -F (fork) . -E syslog. -e . Dropbear SLURM . . - . -m (message of the day) . -w (root). -s . -g (root). -t . . -s . -j (local port forwarding). unix . -k (remote port forwarding). -p [address:]port address TCP port . . ( ). -l interface interface . -i (Service program mode). dropbear TCP/IP inetd tcpsvd tcpserver. -F -p . -P pidfile pidfile (daemon). /var/run/dropbear.pid . -a (forwarded ports). -W windowsize . . -h . -K timeout_seconds (keepalive). . . 0 . . -I idle_timeout idle_timeout . -M . . ( ) -M 0 . -z Dropbear AF21 QoS . -z . -T max_authentication_attempts . (MAX_AUTH_TRIES) -c forced_command / forced_command. command= authorized_keys . SSH_ORIGINAL_COMMAND ( ). . Unix . SSH TCP - -j -k . -D authorized_keys_dir authorized_keys. ~/.ssh ~/ . -Q algo . kex sig cipher mac compress. -V . (FILES) (Authorized Keys) ~/.ssh/authorized_keys Ed25519 RSA ECDSA . authorized_keys ~/.ssh Dropbear . : [restrictions] ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIgAsp... [comment] Dropbear `dropbearkey -y' . OpenSSH ( ). . : no-port-forwarding unix. no-agent-forwarding (agent forwarding) . no-X11-forwarding X11 . no-pty PTY. no-pty . restrict no- . permitopen="host:port" . permitopen authorized_keys . (`*') . IP . permitlisten="port" . permitlisten="port" authorized_keys . 0 . command="forced_command" forced_command. -c . -c . command= restrict SSH . (Host Key Files) : /etc/dropbear/dropbear_dss_host_key /etc/dropbear/dropbear_rsa_host_key /etc/dropbear/dropbear_ecdsa_host_key /etc/dropbear/dropbear_ed25519_host_key. -r . dropbearkey(1) . -R - . /dev/urandom . (Message Of The Day) /etc/motd ( ). ~/.hushlogin . (ENVIRONMENT VARIABLES) Dropbear USER LOGNAME HOME SHELL PATH TERM . : SSH_TTY PTY TTY . SSH_CONNECTION ` ' . DISPLAY X11 . SSH_ORIGINAL_COMMAND command= authorized_keys . . SSH_AUTH_SOCK ssh-agent . (NOTES) Dropbear SSH 2 . (SEE ALSO) dbclient(1), dropbearconvert(1), dropbearkey(1) https://matt.ucc.asn.au/dropbear/dropbear.html (AUTHORS) Matt Johnston . Gerrit Pape . Linux 6.12.107+deb13-amd64 February 1, 2023 Linux 6.12.107+deb13-amd64