.. -*- coding: utf-8; -*-

.. include:: HEADER.rst

===========

 SSH/sshd.

===========

.. contents::

Maintaining key pair.

=====================

::

  $ ssh-keygen -t dsa     # for DSA

  $ ssh-keygen -t rsa     # for RSA

  $ ssh-keygen -t dsa -C comment     # put own comment instead user@host

  $ ssh-keygen -t dsa -f my_dsa_key  # store priv key under my_dsa_key

                                     # and pub key under my_dsa_key.pub

  $ ssh-keygen -y -f my_dsa_key      # recover pub key from priv

  $ ssh-keygen -p -N "newphrase" -P "oldphrase" -f ~/.ssh/id_dsa

                                     # change passphrase of priv key

  $ ssh $user@$host cat ">>" "~/.ssh/authorized_keys" <~/.ssh/id_rsa.pub

                                     # public pub key on remote host

Shell login.

============

::

  $ ssh $user@$host

  $ ssh $user@$host:$port

  $ ssh -i ~/.ssh/my_dsa_key $user@$host

or::

  $ ssh -l $user $host

  $ ssh -l $user $host:$port

X session.

==========

::

  $ ssh -X $user@$host

Multiply private keys.

======================

ssh try use all listen keys::

  $ ssh -i ./priv1 -i ./priv2 $user@$host

or place in ~/.ssh/config::

  Host *

  IdentityFile ~/.ssh/identity # standard search path for protocol ver. 1

  IdentityFile ~/.ssh/id_dsa   # standard search path for RSA key protocol ver. 2

  IdentityFile ~/.ssh/id_rsa   # standard search path for DSA key protocol ver. 2

  IdentityFile ~/.ssh/my_dsa

  IdentityFile ~/.ssh/another_dsa

or per host private key::

  Host host1                   # alias, that user provide at CLI

  HostName host1.example.com   # real host name to log into

  User iam

  IdentifyFile ~/.ssh/iam_priv_dsa

  Host host2                   # alias, that user provide at CLI

  HostName 192.168.1.2         # real host IP to log into

  User admin

  IdentifyFile ~/.ssh/admin_priv_dsa

Installing sshd on Cygwin.

==========================

 * Install base packages and openssh.

 * Set CYGWIN env var to 'binmode ntsec'.

 * Create Windows user.

 * Recreate /etc/passwd::

     $ mkpasswd -l -u user >>/etc/passwd

   or::

     $ mkpasswd -l >/etc/passwd

  * Register sshd::

     $ mkdir -p /home/user

     $ ssh-host-config -y

  * Start::

     $ net start sshd

    or::

     $ cygrunsrv -S sshd

 * Check from remote host::

     $ ssh $gygwin_host -l user

To stop service use::

  $ net stop sshd

or::

  $ cygrunsrv -E sshd

Запускаем SSH server на правах произвольного пользователя.

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