2012 Ericsson AB. All Rights Reserved. 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. SSH ssh_app.sgml
SSH The ssh application implements the SSH (Secure Shell) protocol and provides an SFTP (SSH File Transfer Protocol) client and server.
DEPENDENCIES

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.

CONFIGURATION

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.

PUBLIC KEYS

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.

KNOW HOSTS

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.

AUTHORIZED KEYS

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.

HOST KEYS

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.

SEE ALSO

application(3)