19992015 Ericsson AB. All Rights Reserved. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ssl ssl_app.sgml
ssl The ssl application provides secure communication over sockets.
DEPENDENCIES

The SSL application uses the public_key and Crypto application to handle public keys and encryption, hence these applications must be loaded for the SSL application to work. In an embedded environment this means they must be started with application:start/[1,2] before the SSL application is started.

CONFIGURATION

The application environment configuration parameters in this section are defined for the SSL application. For more information about configuration parameters, see the application(3) manual page in Kernel.

The environment parameters can be set on the command line, for example:

erl -ssl protocol_version "['tlsv1.2', 'tlsv1.1']"

protocol_version = ssl:protocol()]]>

Protocol supported by started clients and servers. If this option is not set, it defaults to all protocols currently supported by the SSL application. This option can be overridden by the version option to ssl:connect/[2,3] and ssl:listen/2.

 ]]>

Maximum lifetime of the session data in seconds.

 ]]>

Name of the session cache callback module that implements the ssl_session_cache_api behavior. Defaults to ssl_session_cache.

 ]]>

List of extra user-defined arguments to the init function in the session cache callback module. Defaults to [].

 ]]>
]]>

Limits the growth of the clients/servers session cache, if the maximum number of sessions is reached, the current cache entries will be invalidated regardless of their remaining lifetime. Defaults to 1000.

]]>

Number of milliseconds between PEM cache validations.

ssl:clear_pem_cache/0 ]]>

Number of milliseconds between sending of a fatal alert and closing the connection. Waiting a little while improves the peers chances to properly receiving the alert so it may shutdown gracefully. Defaults to 5000 milliseconds.

ERROR LOGGER AND EVENT HANDLERS

The SSL application uses the default OTP error logger to log unexpected errors and TLS alerts. The logging of TLS alerts may be turned off with the log_alert option.

SEE ALSO

application(3)