ssh2 man page on Plan9

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SSH2(1)								       SSH2(1)

       ssh2, sshsession, rsa2ssh2 - encrypted login and copy with foreign sys‐
       tems via SSHv2

       ssh2 [ -adIiKkmrvx ] [ -l user ] [ -n dir ] [ -z attribute=value ] sys‐
       tem [ cmd [ args ] ]

       aux/sshsession  [ -t ] [ -n namespace ] [ -R dir ] [ -r dir ] [ -s com‐
       mand ] [ -S srvpt ]

       rsa2ssh2 [ file ]

       These programs collectively implement communication  via	 SSH  v2  over
       TCP.   All of the encryption, authentication, and SSH protocol are han‐
       dled by ssh(4).

       Ssh2 dials a remote system and runs a shell  (or	 some  other  command)
       there.	will result in a command prompt on the machine hannibal logged
       in as root.  If ssh2 does not find an  SSH  server  in  /net,  it  runs
       netssh (see ssh(4)) to start one.  Ssh2 dials the remote SSH server and
       exchanges encryption keys with  the  server  using  Diffie-Hellman  key

       A clone file and connect message protocol similar to that of ip(3) cre‐
       ates a session in the established connection.  In the course of session
       creation,  ssh2 first attempts to authenticate the user with the server
       using public key authentication.	 If that fails, it prompts for a pass‐
       word,  and  attempts  to authenticate with password authentication.  It
       also passes across the value of the environment variable TERM as	 would
       be set if ssh2 is run inside of vt(1).

       Per  con(1), typing a control-\ will result in a >>> prompt.  There are
       currently only four commands that can be issued at that	prompt:	 c  to
       continue the session, h to print a list of the available commands, r to
       toggle the suppression of carriage returns, and q to close the session.

       Options are:

       -a -v -x
	      No-ops included for compatibility with scp (see ssh1(1)).

       -d     Increase the amount of debugging output.

       -i -I  Sets ssh2 to interactive	(-i)  or  non-interactive  (-I)	 mode.
	      This  determines	whether the user is prompted for a password if
	      none is found in factotum.  Without  either  of  these  options,
	      ssh2 uses interactive mode if run in a term window.

       -k     Skip  the	 attempt  to authenticate using public key authentica‐

       -K     Don't fall back to password authentication.  If the  public  key
	      authentication fails, ssh2 will exit.

       -l     Use user name on the remote system (deprecated).

       -m     Remove  the special meaning of control-\.	 This is needed by scp
	      to prevent that character in files being copied from  triggering
	      the special command mode.

       -n     Specify  the  network  directory of an alternate network to use.
	      The default is /net.

       -r     Strip carriage return characters coming from the remote  system.
	      This will normally be desired when running in a rio(1) window or
	      from within win(1) in acme(1).  It is  normally  not  used  when
	      running ssh2 from within vt(1).

       -z     Used to specify which of several possible keys to use.

   Server-side Daemon
       Sshsession implements the server side of an SSH connection and is suit‐
       able for running by listen(8)  or  listen1;  it	is  not	 normally  run
       directly	 by the user.  Like ssh2, it does all of its SSH communication
       through ssh(4).	Sshsession starts a shell or a requested command  when
       a  remote  system  authenticates and requests a new connection and ses‐

       A system-wide SSH listener can be run by creating a  file  /rc/bin/ser‐
       vice.auth/ssh22 that invokes sshsession:

	      # ssh22
	      exec aux/sshsession $3 >>/sys/log/sshdebug >[2=1]

       then ensuring that /rc/bin/cpurc contains

	      netssh -s ssh
	      aux/listen -t /rc/bin/service.auth -d /rc/bin/service ssh

       When  invoked  with  no	options,  sshsession  runs  as	an SSH server.
       Options are:

       -n     Use a namespace  other  than  the	 default  /lib/namespace  when
	      starting the shell or running the requested command.

       -r     Run the SSH session in dir.

       -R     Like  -r	but  also  prevent any arguments, in the command to be
	      executed, from accessing files outside this directory; primarily
	      used to limit what scp can access.

       -s     Execute command instead of /bin/rc.

       -S     Create  /srv/srvpt  if  an  SSH server is not already mounted in

       -t     Trust sshsession and run it in the same namespace as the	listen
	      that started it.

       A  private SSH listener can be run by starting netssh (see ssh(4)) then
       running listen1:

	      if (! test -e /net/ssh) netssh -s ssh
	      aux/listen1 -t 'ssh!*!2222' aux/sshsession

       Rsa2ssh2 converts an RSA key to one suitable for use  with  SSH	v2  on
       Unix  systems.	The  following command will extract the public part of
       the key and add it to the authorized_keys file on a remote Unix system:

	      grep 'proto=rsa' /mnt/factotum/ctl | rsa2ssh2 |
		   ssh2 user@unix 'cat >>.ssh/authorized_keys'

	      System-wide known host public keys.

	      Per-user known host public keys.



       con(1), cpu(1), secstore(1), ssh1(1), vt(1), factotum(4), ssh(4),  lis‐
       RFCs 4250, 4251, 4252, 4253, 4254, and 4419

       Sshsession  shouldn't  have  to	run as the host owner and using facto‐
       tum(4) correctly would permit this.

       The SSH v2 protocol is a classic second system: over-engineered, overly
       complicated, misdesigned and jammed full of pointless goodies.

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