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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_&lt;*>.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>