1<?xml version="1.0" encoding="ISO-8859-1"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- 4 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 5 This file is generated from xml source: DO NOT EDIT 6 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 7 --> 8<title>mod_session_dbd - Apache HTTP Server</title> 9<link href="/style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> 10<link href="/style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> 11<link href="/style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="/style/css/prettify.css" /> 12<script src="/style/scripts/prettify.min.js" type="text/javascript"> 13</script> 14 15<link href="/images/favicon.ico" rel="shortcut icon" /></head> 16<body> 17<div id="page-header"> 18<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="/glossary.html">Glossary</a> | <a href="/sitemap.html">Sitemap</a></p> 19<p class="apache">Apache HTTP Server Version 2.4</p> 20<img alt="" src="/images/feather.gif" /></div> 21<div class="up"><a href="./"><img title="<-" alt="<-" src="/images/left.gif" /></a></div> 22<div id="path"> 23<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">Modules</a></div> 24<div id="page-content"> 25<div id="preamble"><h1>Apache Module mod_session_dbd</h1> 26<div class="toplang"> 27<p><span>Available Languages: </span><a href="/en/mod/mod_session_dbd.html" title="English"> en </a> | 28<a href="/fr/mod/mod_session_dbd.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p> 29</div> 30<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>DBD/SQL based session support</td></tr> 31<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr> 32<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>session_dbd_module</td></tr> 33<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_session_dbd.c</td></tr> 34<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3 and later</td></tr></table> 35<h3>Summary</h3> 36 37 <div class="warning"><h3>Warning</h3> 38 <p>The session modules make use of HTTP cookies, and as such can fall 39 victim to Cross Site Scripting attacks, or expose potentially private 40 information to clients. Please ensure that the relevant risks have 41 been taken into account before enabling the session functionality on 42 your server.</p> 43 </div> 44 45 <p>This submodule of <code class="module"><a href="/mod/mod_session.html">mod_session</a></code> provides support for the 46 storage of user sessions within a SQL database using the 47 <code class="module"><a href="/mod/mod_dbd.html">mod_dbd</a></code> module.</p> 48 49 <p>Sessions can either be <strong>anonymous</strong>, where the session is 50 keyed by a unique UUID string stored on the browser in a cookie, or 51 <strong>per user</strong>, where the session is keyed against the userid of 52 the logged in user.</p> 53 54 <p>SQL based sessions are hidden from the browser, and so offer a measure of 55 privacy without the need for encryption.</p> 56 57 <p>Different webservers within a server farm may choose to share a database, 58 and so share sessions with one another.</p> 59 60 <p>For more details on the session interface, see the documentation for 61 the <code class="module"><a href="/mod/mod_session.html">mod_session</a></code> module.</p> 62 63</div> 64<div id="quickview"><h3 class="directives">Directives</h3> 65<ul id="toc"> 66<li><img alt="" src="/images/down.gif" /> <a href="#sessiondbdcookiename">SessionDBDCookieName</a></li> 67<li><img alt="" src="/images/down.gif" /> <a href="#sessiondbdcookiename2">SessionDBDCookieName2</a></li> 68<li><img alt="" src="/images/down.gif" /> <a href="#sessiondbdcookieremove">SessionDBDCookieRemove</a></li> 69<li><img alt="" src="/images/down.gif" /> <a href="#sessiondbddeletelabel">SessionDBDDeleteLabel</a></li> 70<li><img alt="" src="/images/down.gif" /> <a href="#sessiondbdinsertlabel">SessionDBDInsertLabel</a></li> 71<li><img alt="" src="/images/down.gif" /> <a href="#sessiondbdperuser">SessionDBDPerUser</a></li> 72<li><img alt="" src="/images/down.gif" /> <a href="#sessiondbdselectlabel">SessionDBDSelectLabel</a></li> 73<li><img alt="" src="/images/down.gif" /> <a href="#sessiondbdupdatelabel">SessionDBDUpdateLabel</a></li> 74</ul> 75<h3>Topics</h3> 76<ul id="topics"> 77<li><img alt="" src="/images/down.gif" /> <a href="#dbdconfig">DBD Configuration</a></li> 78<li><img alt="" src="/images/down.gif" /> <a href="#anonymous">Anonymous Sessions</a></li> 79<li><img alt="" src="/images/down.gif" /> <a href="#peruser">Per User Sessions</a></li> 80<li><img alt="" src="/images/down.gif" /> <a href="#housekeeping">Database Housekeeping</a></li> 81</ul><h3>See also</h3> 82<ul class="seealso"> 83<li><code class="module"><a href="/mod/mod_session.html">mod_session</a></code></li> 84<li><code class="module"><a href="/mod/mod_session_crypto.html">mod_session_crypto</a></code></li> 85<li><code class="module"><a href="/mod/mod_session_cookie.html">mod_session_cookie</a></code></li> 86<li><code class="module"><a href="/mod/mod_dbd.html">mod_dbd</a></code></li> 87</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> 88<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 89<div class="section"> 90<h2><a name="dbdconfig" id="dbdconfig">DBD Configuration</a></h2> 91 92 <p>Before the <code class="module"><a href="/mod/mod_session_dbd.html">mod_session_dbd</a></code> module can be configured to maintain a 93 session, the <code class="module"><a href="/mod/mod_dbd.html">mod_dbd</a></code> module must be configured to make the various database queries 94 available to the server.</p> 95 96 <p>There are four queries required to keep a session maintained, to select an existing session, 97 to update an existing session, to insert a new session, and to delete an expired or empty 98 session. These queries are configured as per the example below.</p> 99 100 <div class="example"><h3>Sample DBD configuration</h3><pre class="prettyprint lang-config">DBDriver pgsql 101DBDParams "dbname=apachesession user=apache password=xxxxx host=localhost" 102DBDPrepareSQL "delete from session where key = %s" deletesession 103DBDPrepareSQL "update session set value = %s, expiry = %lld, key = %s where key = %s" updatesession 104DBDPrepareSQL "insert into session (value, expiry, key) values (%s, %lld, %s)" insertsession 105DBDPrepareSQL "select value from session where key = %s and (expiry = 0 or expiry > %lld)" selectsession 106DBDPrepareSQL "delete from session where expiry != 0 and expiry < %lld" cleansession</pre> 107</div> 108 109 </div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 110<div class="section"> 111<h2><a name="anonymous" id="anonymous">Anonymous Sessions</a></h2> 112 113 <p>Anonymous sessions are keyed against a unique UUID, and stored on the 114 browser within an HTTP cookie. This method is similar to that used by most 115 application servers to store session information.</p> 116 117 <p>To create a simple anonymous session and store it in a postgres database 118 table called <var>apachesession</var>, and save the session ID in a cookie 119 called <var>session</var>, configure the session as follows:</p> 120 121 <div class="example"><h3>SQL based anonymous session</h3><pre class="prettyprint lang-config">Session On 122SessionDBDCookieName session path=/</pre> 123</div> 124 125 <p>For more examples on how the session can be configured to be read 126 from and written to by a CGI application, see the 127 <code class="module"><a href="/mod/mod_session.html">mod_session</a></code> examples section.</p> 128 129 <p>For documentation on how the session can be used to store username 130 and password details, see the <code class="module"><a href="/mod/mod_auth_form.html">mod_auth_form</a></code> module.</p> 131 132 </div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 133<div class="section"> 134<h2><a name="peruser" id="peruser">Per User Sessions</a></h2> 135 136 <p>Per user sessions are keyed against the username of a successfully 137 authenticated user. It offers the most privacy, as no external handle 138 to the session exists outside of the authenticated realm.</p> 139 140 <p>Per user sessions work within a correctly configured authenticated 141 environment, be that using basic authentication, digest authentication 142 or SSL client certificates. Due to the limitations of who came first, 143 the chicken or the egg, per user sessions cannot be used to store 144 authentication credentials from a module like 145 <code class="module"><a href="/mod/mod_auth_form.html">mod_auth_form</a></code>.</p> 146 147 <p>To create a simple per user session and store it in a postgres database 148 table called <var>apachesession</var>, and with the session keyed to the 149 userid, configure the session as follows:</p> 150 151 <div class="example"><h3>SQL based per user session</h3><pre class="prettyprint lang-config">Session On 152SessionDBDPerUser On</pre> 153</div> 154 155 </div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 156<div class="section"> 157<h2><a name="housekeeping" id="housekeeping">Database Housekeeping</a></h2> 158 <p>Over the course of time, the database can be expected to start accumulating 159 expired sessions. At this point, the <code class="module"><a href="/mod/mod_session_dbd.html">mod_session_dbd</a></code> module 160 is not yet able to handle session expiry automatically.</p> 161 162 <div class="warning"><h3>Warning</h3> 163 <p>The administrator will need to set up an external process via cron to clean 164 out expired sessions.</p> 165 </div> 166 167 </div> 168<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 169<div class="directive-section"><h2><a name="SessionDBDCookieName" id="SessionDBDCookieName">SessionDBDCookieName</a> <a name="sessiondbdcookiename" id="sessiondbdcookiename">Directive</a></h2> 170<table class="directive"> 171<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Name and attributes for the RFC2109 cookie storing the session ID</td></tr> 172<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDCookieName <var>name</var> <var>attributes</var></code></td></tr> 173<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr> 174<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 175<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 176<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr> 177</table> 178 <p>The <code class="directive">SessionDBDCookieName</code> directive specifies the name and 179 optional attributes of an RFC2109 compliant cookie inside which the session ID will 180 be stored. RFC2109 cookies are set using the <code>Set-Cookie</code> HTTP header. 181 </p> 182 183 <p>An optional list of cookie attributes can be specified, as per the example below. 184 These attributes are inserted into the cookie as is, and are not interpreted by 185 Apache. Ensure that your attributes are defined correctly as per the cookie specification. 186 </p> 187 188 <div class="example"><h3>Cookie with attributes</h3><pre class="prettyprint lang-config">Session On 189SessionDBDCookieName session path=/private;domain=example.com;httponly;secure;version=1;</pre> 190</div> 191 192 193</div> 194<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 195<div class="directive-section"><h2><a name="SessionDBDCookieName2" id="SessionDBDCookieName2">SessionDBDCookieName2</a> <a name="sessiondbdcookiename2" id="sessiondbdcookiename2">Directive</a></h2> 196<table class="directive"> 197<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Name and attributes for the RFC2965 cookie storing the session ID</td></tr> 198<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDCookieName2 <var>name</var> <var>attributes</var></code></td></tr> 199<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>none</code></td></tr> 200<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 201<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 202<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr> 203</table> 204 <p>The <code class="directive">SessionDBDCookieName2</code> directive specifies the name and 205 optional attributes of an RFC2965 compliant cookie inside which the session ID will 206 be stored. RFC2965 cookies are set using the <code>Set-Cookie2</code> HTTP header. 207 </p> 208 209 <p>An optional list of cookie attributes can be specified, as per the example below. 210 These attributes are inserted into the cookie as is, and are not interpreted by 211 Apache. Ensure that your attributes are defined correctly as per the cookie specification. 212 </p> 213 214 <div class="example"><h3>Cookie2 with attributes</h3><pre class="prettyprint lang-config">Session On 215SessionDBDCookieName2 session path=/private;domain=example.com;httponly;secure;version=1;</pre> 216</div> 217 218 219</div> 220<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 221<div class="directive-section"><h2><a name="SessionDBDCookieRemove" id="SessionDBDCookieRemove">SessionDBDCookieRemove</a> <a name="sessiondbdcookieremove" id="sessiondbdcookieremove">Directive</a></h2> 222<table class="directive"> 223<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Control for whether session ID cookies should be removed from incoming HTTP headers</td></tr> 224<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDCookieRemove On|Off</code></td></tr> 225<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDCookieRemove On</code></td></tr> 226<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 227<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 228<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr> 229</table> 230 <p>The <code class="directive">SessionDBDCookieRemove</code> flag controls whether the cookies 231 containing the session ID will be removed from the headers during request processing.</p> 232 233 <p>In a reverse proxy situation where the Apache server acts as a server frontend for 234 a backend origin server, revealing the contents of the session ID cookie to the backend 235 could be a potential privacy violation. When set to on, the session ID cookie will be 236 removed from the incoming HTTP headers.</p> 237 238 239</div> 240<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 241<div class="directive-section"><h2><a name="SessionDBDDeleteLabel" id="SessionDBDDeleteLabel">SessionDBDDeleteLabel</a> <a name="sessiondbddeletelabel" id="sessiondbddeletelabel">Directive</a></h2> 242<table class="directive"> 243<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The SQL query to use to remove sessions from the database</td></tr> 244<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDDeleteLabel <var>label</var></code></td></tr> 245<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDDeleteLabel deletesession</code></td></tr> 246<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 247<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 248<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr> 249</table> 250 <p>The <code class="directive">SessionDBDDeleteLabel</code> directive sets the default delete 251 query label to be used to delete an expired or empty session. This label must have been previously 252 defined using the <code class="directive"><a href="/mod/mod_dbd.html#dbdpreparesql">DBDPrepareSQL</a></code> directive.</p> 253 254 255</div> 256<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 257<div class="directive-section"><h2><a name="SessionDBDInsertLabel" id="SessionDBDInsertLabel">SessionDBDInsertLabel</a> <a name="sessiondbdinsertlabel" id="sessiondbdinsertlabel">Directive</a></h2> 258<table class="directive"> 259<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The SQL query to use to insert sessions into the database</td></tr> 260<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDInsertLabel <var>label</var></code></td></tr> 261<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDInsertLabel insertsession</code></td></tr> 262<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 263<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 264<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr> 265</table> 266 <p>The <code class="directive">SessionDBDInsertLabel</code> directive sets the default insert 267 query label to be used to load in a session. This label must have been previously defined using the 268 <code class="directive"><a href="/mod/mod_dbd.html#dbdpreparesql">DBDPrepareSQL</a></code> directive.</p> 269 270 <p>If an attempt to update the session affects no rows, this query will be called to insert the 271 session into the database.</p> 272 273 274</div> 275<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 276<div class="directive-section"><h2><a name="SessionDBDPerUser" id="SessionDBDPerUser">SessionDBDPerUser</a> <a name="sessiondbdperuser" id="sessiondbdperuser">Directive</a></h2> 277<table class="directive"> 278<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable a per user session</td></tr> 279<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDPerUser On|Off</code></td></tr> 280<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDPerUser Off</code></td></tr> 281<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 282<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 283<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr> 284</table> 285 <p>The <code class="directive">SessionDBDPerUser</code> flag enables a per user session keyed 286 against the user's login name. If the user is not logged in, this directive will be 287 ignored.</p> 288 289 290</div> 291<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 292<div class="directive-section"><h2><a name="SessionDBDSelectLabel" id="SessionDBDSelectLabel">SessionDBDSelectLabel</a> <a name="sessiondbdselectlabel" id="sessiondbdselectlabel">Directive</a></h2> 293<table class="directive"> 294<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The SQL query to use to select sessions from the database</td></tr> 295<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDSelectLabel <var>label</var></code></td></tr> 296<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDSelectLabel selectsession</code></td></tr> 297<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 298<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 299<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr> 300</table> 301 <p>The <code class="directive">SessionDBDSelectLabel</code> directive sets the default select 302 query label to be used to load in a session. This label must have been previously defined using the 303 <code class="directive"><a href="/mod/mod_dbd.html#dbdpreparesql">DBDPrepareSQL</a></code> directive.</p> 304 305 306</div> 307<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 308<div class="directive-section"><h2><a name="SessionDBDUpdateLabel" id="SessionDBDUpdateLabel">SessionDBDUpdateLabel</a> <a name="sessiondbdupdatelabel" id="sessiondbdupdatelabel">Directive</a></h2> 309<table class="directive"> 310<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The SQL query to use to update existing sessions in the database</td></tr> 311<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SessionDBDUpdateLabel <var>label</var></code></td></tr> 312<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SessionDBDUpdateLabel updatesession</code></td></tr> 313<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr> 314<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> 315<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_session_dbd</td></tr> 316</table> 317 <p>The <code class="directive">SessionDBDUpdateLabel</code> directive sets the default update 318 query label to be used to load in a session. This label must have been previously defined using the 319 <code class="directive"><a href="/mod/mod_dbd.html#dbdpreparesql">DBDPrepareSQL</a></code> directive.</p> 320 321 <p>If an attempt to update the session affects no rows, the insert query will be 322 called to insert the session into the database. If the database supports InsertOrUpdate, 323 override this query to perform the update in one query instead of two.</p> 324 325 326</div> 327</div> 328<div class="bottomlang"> 329<p><span>Available Languages: </span><a href="/en/mod/mod_session_dbd.html" title="English"> en </a> | 330<a href="/fr/mod/mod_session_dbd.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p> 331</div><div class="top"><a href="#page-header"><img src="/images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. 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