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252 lines
9.7 KiB
XML
252 lines
9.7 KiB
XML
<?xml version="1.0"?>
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<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
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<?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
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<!-- $LastChangedRevision$ -->
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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<modulesynopsis metafile="mod_session_crypto.xml.meta">
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<name>mod_session_crypto</name>
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<description>Session encryption support</description>
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<status>Experimental</status>
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<sourcefile>mod_session_crypto.c</sourcefile>
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<identifier>session_crypto_module</identifier>
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<compatibility>Available in Apache 2.3 and later</compatibility>
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<summary>
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<note type="warning"><title>Warning</title>
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<p>The session modules make use of HTTP cookies, and as such can fall
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victim to Cross Site Scripting attacks, or expose potentially private
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information to clients. Please ensure that the relevant risks have
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been taken into account before enabling the session functionality on
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your server.</p>
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</note>
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<p>This submodule of <module>mod_session</module> provides support for the
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encryption of user sessions before being written to a local database, or
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written to a remote browser via an HTTP cookie.</p>
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<p>This can help provide privacy to user sessions where the contents of
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the session should be kept private from the user, or where protection is
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needed against the effects of cross site scripting attacks.</p>
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<p>For more details on the session interface, see the documentation for
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the <module>mod_session</module> module.</p>
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</summary>
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<seealso><module>mod_session</module></seealso>
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<seealso><module>mod_session_cookie</module></seealso>
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<seealso><module>mod_session_dbd</module></seealso>
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<section id="basicusage"><title>Basic Usage</title>
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<p>To create a simple encrypted session and store it in a cookie called
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<var>session</var>, configure the session as follows:</p>
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<example><title>Browser based encrypted session</title>
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<highlight language="config">
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Session On
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SessionCookieName session path=/
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SessionCryptoPassphrase secret
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</highlight>
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</example>
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<p>The session will be encrypted with the given key. Different servers can
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be configured to share sessions by ensuring the same encryption key is used
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on each server.</p>
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<p>If the encryption key is changed, sessions will be invalidated
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automatically.</p>
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<p>For documentation on how the session can be used to store username
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and password details, see the <module>mod_auth_form</module> module.</p>
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</section>
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<directivesynopsis>
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<name>SessionCryptoDriver</name>
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<description>The crypto driver to be used to encrypt the session</description>
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<syntax>SessionCryptoDriver <var>name</var> <var>[param[=value]]</var></syntax>
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<default>none</default>
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<contextlist><context>server config</context>
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</contextlist>
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<compatibility>Available in Apache 2.3.0 and later</compatibility>
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<usage>
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<p>The <directive>SessionCryptoDriver</directive> directive specifies the name of
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the crypto driver to be used for encryption. If not specified, the driver defaults
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to the recommended driver compiled into APR-util.</p>
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<p>The <var>NSS</var> crypto driver requires some parameters for configuration,
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which are specified as parameters with optional values after the driver name.</p>
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<example><title>NSS without a certificate database</title>
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<highlight language="config">
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SessionCryptoDriver nss
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</highlight>
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</example>
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<example><title>NSS with certificate database</title>
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<highlight language="config">
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SessionCryptoDriver nss dir=certs
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</highlight>
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</example>
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<example><title>NSS with certificate database and parameters</title>
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<highlight language="config">
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SessionCryptoDriver nss dir=certs key3=key3.db cert7=cert7.db secmod=secmod
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</highlight>
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</example>
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<example><title>NSS with paths containing spaces</title>
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<highlight language="config">
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SessionCryptoDriver nss "dir=My Certs" key3=key3.db cert7=cert7.db secmod=secmod
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</highlight>
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</example>
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<p>The <var>NSS</var> crypto driver might have already been
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configured by another part of the server, for example from
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<code>mod_nss</code> or <module>mod_ldap</module>. If found to
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have already been configured, a warning will be logged, and the
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existing configuration will have taken affect. To avoid this
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warning, use the noinit parameter as follows.</p>
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<example><title>NSS with certificate database</title>
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<highlight language="config">
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SessionCryptoDriver nss noinit
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</highlight>
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</example>
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<p>To prevent confusion, ensure that all modules requiring NSS are configured with
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identical parameters.</p>
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<p>The <var>openssl</var> crypto driver supports an optional parameter to specify
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the engine to be used for encryption.</p>
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<example><title>OpenSSL with engine support</title>
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<highlight language="config">
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SessionCryptoDriver openssl engine=name
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</highlight>
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</example>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>SessionCryptoPassphrase</name>
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<description>The key used to encrypt the session</description>
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<syntax>SessionCryptoPassphrase <var>secret</var> [ <var>secret</var> ... ] </syntax>
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<default>none</default>
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<contextlist><context>server config</context>
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<context>virtual host</context>
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<context>directory</context>
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<context>.htaccess</context>
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</contextlist>
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<override>AuthConfig</override>
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<compatibility>Available in Apache 2.3.0 and later</compatibility>
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<usage>
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<p>The <directive>SessionCryptoPassphrase</directive> directive specifies the keys
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to be used to enable symmetrical encryption on the contents of the session before
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writing the session, or decrypting the contents of the session after reading the
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session.</p>
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<p>Keys are more secure when they are long, and consist of truly random characters.
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Changing the key on a server has the effect of invalidating all existing sessions.</p>
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<p>Multiple keys can be specified in order to support key rotation. The first key
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listed will be used for encryption, while all keys listed will be attempted for
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decryption. To rotate keys across multiple servers over a period of time, add a new
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secret to the end of the list, and once rolled out completely to all servers, remove
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the first key from the start of the list.</p>
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<p>As of version 2.4.7 if the value begins with <var>exec:</var> the resulting command
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will be executed and the first line returned to standard output by the program will be
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used as the key.</p>
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<example><pre>
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#key used as-is
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SessionCryptoPassphrase secret
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#Run /path/to/program to get key
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SessionCryptoPassphrase exec:/path/to/program
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#Run /path/to/otherProgram and provide arguments
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SessionCryptoPassphrase "exec:/path/to/otherProgram argument1"
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</pre></example>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>SessionCryptoPassphraseFile</name>
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<description>File containing keys used to encrypt the session</description>
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<syntax>SessionCryptoPassphraseFile <var>filename</var></syntax>
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<default>none</default>
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<contextlist><context>server config</context>
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<context>virtual host</context>
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<context>directory</context>
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</contextlist>
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<compatibility>Available in Apache 2.3.0 and later</compatibility>
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<usage>
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<p>The <directive>SessionCryptoPassphraseFile</directive> directive specifies the
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name of a configuration file containing the keys to use for encrypting or decrypting
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the session, specified one per line. The file is read on server start, and a graceful
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restart will be necessary for httpd to pick up changes to the keys.</p>
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<p>Unlike the <directive>SessionCryptoPassphrase</directive> directive, the keys are
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not exposed within the httpd configuration and can be hidden by protecting the file
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appropriately.</p>
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<p>Multiple keys can be specified in order to support key rotation. The first key
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listed will be used for encryption, while all keys listed will be attempted for
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decryption. To rotate keys across multiple servers over a period of time, add a new
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secret to the end of the list, and once rolled out completely to all servers, remove
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the first key from the start of the list.</p>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>SessionCryptoCipher</name>
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<description>The crypto cipher to be used to encrypt the session</description>
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<syntax>SessionCryptoCipher <var>name</var></syntax>
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<default>aes256</default>
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<contextlist><context>server config</context>
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<context>virtual host</context>
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<context>directory</context>
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<context>.htaccess</context>
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</contextlist>
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<override>AuthConfig</override>
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<compatibility>Available in Apache 2.3.0 and later</compatibility>
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<usage>
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<p>The <directive>SessionCryptoCipher</directive> directive allows the cipher to
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be used during encryption. If not specified, the cipher defaults to
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<code>aes256</code>.</p>
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<p>Possible values depend on the crypto driver in use, and could be one of:</p>
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<ul><li>3des192</li><li>aes128</li><li>aes192</li><li>aes256</li></ul>
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</usage>
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</directivesynopsis>
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</modulesynopsis>
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