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<?xml version="1.0" encoding="iso-8859-1" ?>
<!DOCTYPE appref SYSTEM "appref.dtd">
<appref>
<header>
<copyright>
<year>2012</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
The contents of this file are subject to the Erlang Public License,
Version 1.1, (the "License"); you may not use this file except in
compliance with the License. You should have received a copy of the
Erlang Public License along with this software. If not, it can be
retrieved online at http://www.erlang.org/.
Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
the License for the specific language governing rights and limitations
under the License.
</legalnotice>
<title>SSH</title>
<file>ssh_app.sgml</file>
</header>
<app>SSH</app>
<appsummary>The ssh application implements the SSH (Secure Shell) protocol and
provides an SFTP (SSH File Transfer Protocol) client and server. </appsummary>
<section>
<title>DEPENDENCIES</title>
<p>The ssh application uses the Erlang applications public_key and
crypto to handle public keys and encryption, hence these
applications needs to be loaded for the ssh application to work. In
an embedded environment that means they need to be started with
application:start/[1,2] before the ssh application is started.
</p>
</section>
<section>
<title>CONFIGURATION</title>
<p>The ssh application does not currently have an application
specific configuration file as described in application(3),
however it will by default use the following configuration files
from openssh: known_hosts, authorized_keys, authorized_keys2,
id_dsa and id_rsa, ssh_host_dsa_key and ssh_host_rsa_key. By
default Erlang SSH will look for id_dsa, id_rsa, known_hosts
and authorized_keys in ~/.ssh, and the host key files in /etc/ssh
. These locations may be changed by the options user_dir and
system_dir. Public key handling may also be customized by
providing a callback module implementing the behavior ssh_key_api.
</p>
<section>
<title>PUBLIC KEYS</title>
<p>
id_dsa and id_rsa are the users private key files, note that
the public key is part of the private key so the ssh
application will not use the id_<*>.pub files. These are
for the users convenience when he/she needs to convey their
public key.
</p>
</section>
<section>
<title>KNOW HOSTS</title>
<p>The known_hosts file contains a list of approved servers and
their public keys. Once a server is listed, it can be verified
without user interaction.
</p>
</section>
<section>
<title>AUTHORIZED KEYS</title>
<p>The authorized key file keeps track of the user's authorized
public keys. The most common use of this file is to let users
log in without entering their password which is supported by the
Erlang SSH daemon.
</p>
</section>
<section>
<title>HOST KEYS</title>
<p>Currently rsa and dsa host keys are supported and are
expected to be found in files named ssh_host_rsa_key and
ssh_host_dsa_key.
</p>
</section>
</section>
<section>
<title>SEE ALSO</title>
<p>application(3)</p>
</section>
</appref>
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