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<!DOCTYPE html>
<html>
<head>
<title>ProFTPD module mod_ifsession</title>
</head>

<body bgcolor=white>

<hr>
<center>
<h2><b>ProFTPD module <code>mod_ifsession</code></b></h2>
</center>
<hr><br>

The purpose of <code>mod_ifsession</code> is to provide a flexible way of
specifying that certain configuration directives only apply to certain sessions,
based on credentials such as connection class, user, or group membership.

<p>
For class-based qualifications, <code>mod_ifsession</code> will apply 
configuration directives to the current session as soon as the client has
connected to the server; for user- and group-based qualifications,
<code>mod_ifsession</code> applies configuration directives to the current
session, if applicable, only after the client has successfully authenticated.
This means that <code>mod_ifsession</code> cannot change the effect of some
user- and group-qualified configuration directives, particularly those that
influence the session prior to authentication.  These directives include:
<pre>
  AccessDenyMsg
  AccessGrantMsg
  AnonRequirePassword
  &lt;Anonymous&gt;
  AuthGroupFile
  AuthUserFile
  CreateHome
  DefaultChdir
  DefaultRoot
  DefaultTransferMode
  DisplayConnect
  ExtendedLog
  MaxInstances
  RequireValidShell
  RootLogin
  ServerIdent
  ServerName
  ShowSymlinks
  TransferLog
  UseFtpUsers
  WtmpLog
</pre>
and the directives from the <code>mod_auth_pam</code> module.  All of these
<b>can</b> set on based on class qualifications, however.

<p>
While the above list of configuration directives is daunting, there <b>are</b>
still valid uses for this module, <i>e.g.</i> configuring
<code>&lt;Directory&gt;</code> and/or <code>&lt;Limit&gt;</code> for certain
sessions, <code>Filter</code> directives, transfer rates, maximum file sizes,
etc.  Plus, some of the above directives (<i>e.g.</i> <code>DefaultChdir</code>,
<code>DefaultRoot</code>) already have their own configurable restrictions
(group expressions in the case of <code>DefaultChdir</code> and
<code>DefaultRoot</code>), so all is not entirely lost.

<p>
This module is contained in the <code>contrib/mod_ifsession.c</code> file for
ProFTPD 1.2.<i>x</i>/1.3.<i>x</i>, and is not compiled by default.
Installation instructions are discussed <a href="#Installation">here</a>.

<p>
The most current version of <code>mod_ifsession</code> is distributed with
the ProFTPD source.

<h2>Author</h2>
<p>
Please contact TJ Saunders &lt;tj <i>at</i> castaglia.org&gt; with any
questions, concerns, or suggestions regarding this module.

<h2>Directives</h2>
<ul>
  <li><a href="#IfAuthenticated">&lt;IfAuthenticated&gt;</a>
  <li><a href="#IfClass">&lt;IfClass&gt;</a>
  <li><a href="#IfGroup">&lt;IfGroup&gt;</a>
  <li><a href="#IfUser">&lt;IfUser&gt;</a>
</ul>

<hr>
<h3><a name="IfAuthenticated">&lt;IfAuthenticated&gt;</a></h3>
<strong>Syntax:</strong> &lt;IfAuthenticated&gt;<br>
<strong>Default:</strong> None<br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_ifsession<br>
<strong>Compatibility:</strong> 1.3.5rc1 and later

<p>
The <code>&lt;IfAuthenticated&gt;</code> context should contain any
configuration directives that should be in effect for any sessions where
the client has successfully authenticated.

<p>
Examples:
<pre>
  # Only configure SQL logging for authenticated users, to avoid cluttering
  # database tables with fail login data
  &lt;IfAuthenticated&gt;
    SQLLog ...
  &lt;/IfAuthenticated&gt;
</pre>

<p>
See also: <a href="#IfGroup">&lt;IfGroup&gt;</a>, <a href="#IfUser">&lt;IfUser&gt;</a>

<hr>
<h3><a name="IfClass">&lt;IfClass&gt;</a></h3>
<strong>Syntax:</strong> &lt;IfClass <em>[&quot;AND&quot;|&quot;OR&quot;] class-expression|&quot;regex&quot; regexp</em>&gt;<br>
<strong>Default:</strong> None<br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_ifsession<br>
<strong>Compatibility:</strong> 1.2.8rc1 and later

<p>
The <code>&lt;IfClass&gt;</code> context should contain any configuration
directives that should be in effect for any sessions that match the
<em>class-expression</em>.  <code>Classes</code> must be enabled for this
context to work properly; the connecting client must be in any of the classes
listed in the expression for the directives contained to be applied.  Note
that <code>!</code> notation in front of a class name in the expression is
supported.

<p>
The given <em>class-expression</em> may optionally be prefixed
with either the &quot;AND&quot; or &quot;OR&quot; keywords, which affect how
the expression is evaluated: if &quot;AND&quot; is used, then <b>all</b>
portions of the expression must evaluate to TRUE for the configuration context
to be applied to the current session; if &quot;OR&quot; is used, then <b>any</b>
portion of the expression must be TRUE for the context to be applied.  The
default setting for <code>&lt;IfClass&gt;</code> is &quot;OR&quot;.

<p>
If the &quot;regex&quot; keyword is used, the <em>regexp</em> should be a
regular expression to match class names.

<p>
Examples:
<pre>
  # Give friends, and local users, better transfer rates
  &lt;IfClass local, friends&gt;
    TransferRate RETR 8192
  &lt;/IfClass&gt;

  TransferRate RETR 4096
</pre>

<p>
See also: <a href="#IfGroup">&lt;IfGroup&gt;</a>, <a href="#IfUser">&lt;IfUser&gt;</a>

<p>
<hr>
<h3><a name="IfGroup">&lt;IfGroup&gt;</a></h3>
<strong>Syntax:</strong> &lt;IfGroup <em>[&quot;AND&quot;|&quot;OR&quot;] group-expression|&quot;regex&quot; regexp</em>&gt;<br>
<strong>Default:</strong> None<br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_ifsession<br>
<strong>Compatibility:</strong> 1.2.8rc1 and later

<p>
The <code>&lt;IfGroup&gt;</code> context should contain any configuration
directives that should be in effect for any sessions that match the
<em>group-AND-expression</em>.  The authenticated user must be in <b>all</b> of
the groups listed in the expression for the directives contained to be
applied.  Note that <code>!</code> notation in front of a group name in the
expression is supported.

<p>
The given <em>group-expression</em> may optionally be prefixed
with either the &quot;AND&quot; or &quot;OR&quot; keywords, which affect how
the expression is evaluated: if &quot;AND&quot; is used, then <b>all</b>
portions of the expression must evaluate to TRUE for the configuration context
to be applied to the current session; if &quot;OR&quot; is used, then <b>any</b>
portion of the expression must be TRUE for the context to be applied.  The
default setting for <code>&lt;IfGroup&gt;</code> is &quot;AND&quot;.

<p>
If the &quot;regex&quot; keyword is used, the <em>regexp</em> should be a
regular expression to match group names.

<p>
Example:
<pre>
  # Only members of group webusers can upload/download HTML files
  &lt;IfGroup !webusers&gt;
    PathDenyFilter \.htm$|\.html$
  &lt;/IfGroup&gt;
</pre>

<p>
See also: <a href="#IfClass">&lt;IfClass&gt;</a>, <a href="#IfUser">&lt;IfUser&gt;</a>

<p>
<hr>
<h3><a name="IfUser">&lt;IfUser&gt;</a></h3>
<strong>Syntax:</strong> &lt;IfUser <em>[&quot;AND&quot;|&quot;OR&quot;] user-expression|&quot;regex&quot; regexp</em>&gt;<br>
<strong>Default:</strong> None<br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_ifsession<br>
<strong>Compatibility:</strong> 1.2.8rc1 and later

<p>
The <code>&lt;IfUser&gt;</code> context should contain any configuration
directives that should be in effect for any sessions that match the
<em>user-OR-expression</em>. The authenticated user must be one of the users
listed in the expression for the directives contained to be applied.  Note
that <code>!</code> notation in front of a user name in the expression is
supported.

<p>
The given <em>user-expression</em> may optionally be prefixed
with either the &quot;AND&quot; or &quot;OR&quot; keywords, which affect how
the expression is evaluated: if &quot;AND&quot; is used, then <b>all</b>
portions of the expression must evaluate to TRUE for the configuration context
to be applied to the current session; if &quot;OR&quot; is used, then <b>any</b>
portion of the expression must be TRUE for the context to be applied.  The
default setting for <code>&lt;IfUser&gt;</code> is &quot;OR&quot;.

<p>
If the &quot;regex&quot; keyword is used, the <em>regexp</em> should be a
regular expression to match user names.

<p>
Example:
<pre>
  # Alter the view of files for everyone except the admin
  &lt;IfUser !ftpadm&gt;
    &lt;Directory /&gt;
      DirFakeUser on ~
      DirFakeGroup on ~
      DirFakeMode 0440
    &lt;/Directory&gt;
  &lt;/IfUser&gt;

  # Impose a PathDenyFilter on ftp users
  &lt;IfUser regex ^ftp&gt;
    PathDenyFilter \.conf$
  &lt;/IfUser&gt;
</pre>

<p>
See also: <a href="#IfClass">&lt;IfClass&gt;</a>, <a href="#IfGroup">&lt;IfGroup&gt;</a>

<p>
<hr>
<h2><a name="Usage">Usage</a></h2>

<p>
<b>As a Shared Module</b><br>
If your <code>proftpd</code> is compiled with <code>mod_ifsession</code>
as a shared module, then you <b>must</b> make sure that
<code>mod_ifsession</code> is loaded <b>last</b>:
<pre>
  &lt;IfModule mod_dso.c&gt;
    LoadModule mod_sql.c
    LoadModule mod_sql_mysql.c
    LoadModule mod_tls.c
    LoadModule mod_rewrite.c
    <b>LoadModule mod_ifsession.c</b>
  &lt;/IfModule&gt;
</pre>
Failure to ensure that <code>mod_ifsession</code> is loaded last will mean
that the per-user/group/class functionality will not work as you expect.

<p>
<i>Todo</i><br>
Expressions, AND vs OR

<p>
<hr>
<h2><a name="Installation">Installation</a></h2>
The <code>mod_ifsession</code> module is distributed with ProFTPD.  Follow the
usual steps for using third-party modules in ProFTPD:
<pre>
  $ ./configure --with-modules=mod_ifsession
  $ make
  $ make install
</pre>
Note that <code>mod_ifsession</code> should be the <b>last</b> module
in the <code>--with-modules</code> list, if multiple modules are listed.
This makes sure that <code>mod_ifsession</code>'s changes will be seen
properly by other modules.

<p>
To build <code>mod_ifsession</code> as a DSO module:
<pre>
  $ ./configure --enable-dso --with-shared=mod_ifsession
</pre>
Then follow the usual steps:
<pre>
  $ make 
  $ make install
</pre>

<p>
Alternatively, if your <code>proftpd</code> was compiled with DSO support, you
can use the <code>prxs</code> tool to build <code>mod_ifsession</code> as a
shared module:
<pre>
  $ prxs -c -i -d mod_ifsession.c
</pre>

<p>
<b>Logging</b><br>
The <code>mod_ifsession</code> module supports <a href="../howto/Tracing.html">trace logging</a>, via the module-specific log channels:
<ul>
  <li>ifsession
</ul>
Thus for trace logging, to aid in debugging, you would use the following in
your <code>proftpd.conf</code>:
<pre>
  TraceLog /path/to/ftpd/trace.log
  Trace ifsession:20
</pre>
This trace logging can generate large files; it is intended for debugging use
only, and should be removed from any production configuration.

<p>
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