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Code Editor : mod_quotatab.html

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

<hr>
<center>
<h2>ProFTPD module <code>mod_quotatab</code></h2>
</center>
<hr>

This module is contained in the <code>mod_quotatab.c</code>,
<code>mod_quotatab.h</code>, and in its submodule source files, for
ProFTPD 1.2.x/1.3.x, and is not compiled by default.
Installation instructions can be found <a href="#Installation">here</a>.

This module is designed to impose quotas, both byte- and file-based, on
FTP accounts, based on user, group, class, or for all accounts. It is based
on the ideas contained in Eric Estabrook's <code>mod_quota</code>; however,
this module has been written from scratch to implement quotas in a very
different manner. A more detailed explanation of the <a href="#Usage">usage</a>
of this module follows the directive explanations.

The most current version of <code>mod_quotatab</code>'s submodules supports
storage of quota table information in various formats:
<a name="submodules"></a>
<ul>
 <li><a href="mod_quotatab_file.html"><code>mod_quotatab_file</code></a> for file-based quota tables 
 <li><a href="mod_quotatab_ldap.html"><code>mod_quotatab_ldap</code></a> for LDAP-based quota limit tables 
 <li><a href="mod_quotatab_radius.html"><code>mod_quotatab_radius</code></a> for RADIUS-based quota tables 
 <li><a href="mod_quotatab_sql.html"><code>mod_quotatab_sql</code></a> for SQL-based quota tables 
</ul>

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

<h2>Author</h2>

Please contact TJ Saunders &lt;tj at castaglia.org&gt; with any
questions, concerns, or suggestions regarding this module.

<h2>Thanks</h2>

2002-01-12: Thanks to SupaFly &lt;ntlfy at ntlworld.com&gt; for
helping debug an issue with a missing tally table.

2002-03-30: Thanks to Kai Langheim &lt;kl at q-nic.de&gt; for
pointing out several small bugs affecting users with no quota entries.

2003-01-24: Thanks to Arne Blankerts &lt;Blankerts at tow.de&gt;
for noting small bug with the file upload counter being incorrectly incremented
for overwritten files.

<h2>Directives</h2>
<ul>
 <li><a href="#QuotaDefault">QuotaDefault</a>
 <li><a href="#QuotaDirectoryTally">QuotaDirectoryTally</a>
 <li><a href="#QuotaDisplayUnits">QuotaDisplayUnits</a>
 <li><a href="#QuotaEngine">QuotaEngine</a>
 <li><a href="#QuotaExcludeFilter">QuotaExcludeFilter</a>
 <li><a href="#QuotaLimitTable">QuotaLimitTable</a>
 <li><a href="#QuotaLock">QuotaLock</a>
 <li><a href="#QuotaLog">QuotaLog</a>
 <li><a href="#QuotaOptions">QuotaOptions</a>
 <li><a href="#QuotaShowQuotas">QuotaShowQuotas</a>
 <li><a href="#QuotaTallyTable">QuotaTallyTable</a>
</ul>

<h2><code>SITE</code> Commands</h2>
<ul>
 <li><a href="#SITE_QUOTA">SITE QUOTA</a>
</ul>

<hr>
<h3><a name="QuotaDefault">QuotaDefault</a></h3>
Syntax: QuotaDefault quota-type per-session limit-type bytes-avail-in bytes-avail-out bytes-avail-xfer files-avail-in files-avail-out files-avail-xfer 
Default: None 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_quotatab 
Compatibility: 1.3.5rc1 and later

The <code>QuotaDefault</code> directive configures a "default" quota limit,
to be used when a limit is not found for the current user (e.g. a limit
has not yet been configured for the user via one of the mod_quotatab backends).
Since this "default" needs to provide all of the limit information required
by <code>mod_quotatab</code>, there are quite a few required parameters:
<ul>
 <li>quota-type
 <li>per-session
 <li>limit-type
 <li>bytes-avail-in
 <li>bytes-avail-out
 <li>bytes-avail-xfer
 <li>files-avail-in
 <li>files-avail-out
 <li>files-avail-xfer
</ul>
The meaning of these parameters is discussed in more detail
<a href="#QuotaLookup">here</a>.

For example, you might use:
<pre>
 QuotaDefault user false hard 10485760 0 0 0 0 0
</pre>

<hr>
<h3><a name="QuotaDirectoryTally">QuotaDirectoryTally</a></h3>
Syntax: QuotaDirectoryTally on|off 
Default: QuotaDirectoryTally off 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_quotatab 
Compatibility: 1.2.5rc2 and later

The <code>QuotaDirectoryTally</code> directive configures
<code>mod_quotatab</code> to take directory operations (e.g. creating
a directory, removing a directory) into account when tallying.

<hr>
<h3><a name="QuotaDisplayUnits">QuotaDisplayUnits</a></h3>
Syntax: QuotaDisplayUnits &quot;b&quot;|&quot;Kb&quot;|&quot;Mb&quot;|&quot;Gb&quot; 
Default: None 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_quotatab 
Compatibility: 1.2.5rc2 and later

This directive configures how the user's current byte quota values will be
reported to them. Note that this directive does not affect how the quota
values are stored in the quota table, only their presentation to the user.

&quot;b&quot; causes quotas to be displayed in bytes;
&quot;Kb&quot;, kilobytes; &quot;Mb&quot;, megabytes; and
&quot;Gb&quot;, gigabytes.

Example:
<pre>
 # display quota information in megabytes
 QuotaDisplayUnits Mb
</pre>

<hr>
<h3><a name="QuotaEngine">QuotaEngine</a></h3>
Syntax: QuotaEngine on|off 
Default: None 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_quotatab 
Compatibility: 1.2.5rc2 and later</a>

The <code>QuotaEngine</code> directive enables or disables the module's runtime
quota engine. If it is set to off this module does no runtime
processing at all. Use this directive to disable the module instead of
commenting out all <code>mod_quotatab</code> directives.

<hr>
<h3><a name="QuotaExcludeFilter">QuotaExcludeFilter</a></h3>
Syntax: QuotaExcludeFilter regex|"none" 
Default: None 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_quotatab 
Compatibility: 1.3.1rc1 and later</a>

The <code>QuotaExcludeFilter</code> directive configures a regular expression
filter that is applied to every file handled by <code>mod_quotatab</code>;
this includes files that are scanned if:
<pre>
 QuotaOptions ScanOnLogin
</pre>
is in effect. Any file which matches the configured regular expression is
ignored by <code>mod_quotatab</code>, and will not affect the tally updates.

Note that the regular expression is applied to the absolute path of
the file being handled. This allows for a regular expression which can
exclude particular directories, or just certain filenames.

<hr>
<h3><a name="QuotaLimitTable">QuotaLimitTable</a></h3>
Syntax: QuotaLimitTable source-type:source-info 
Default: None 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_quotatab 
Compatibility: 1.2.5rc2 and later</a>

This directive configures the information necessary for the module to locate
and use the table containing the quota limit, the maximum number
of bytes and/or files defined for use by specific users, groups, classes,
etc, and is required for <code>mod_quotatab</code> to function.
Note that &quot;groups&quot; here refers to the groups of which the user
is a member, the same groups as used for filesystem permissions;
&quot;classes&quot; refers to connection
<a href="../howto/Classes.html">classes</a>.

Please consult the relevant <a href="#submodule">submodule</a> documentation
for details on that module's syntax for this configuration directive.

See also: <a href="#QuotaTallyTable">QuotaTallyTable</a>

<hr>
<h3><a name="QuotaLock">QuotaLock</a></h3>
Syntax: QuotaLock file 
Default: None 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_quotatab 
Compatibility: 1.2.9rc1 and later</a>

The <code>QuotaLock</code> directive sets the filename for a synchronization
lockfile which <code>mod_quotatab</code> needs when communicating with
some submodules, such as for SQL-based tables, which have trouble providing
the needed synchronization/locking semantics. Use of <code>QuotaLock</code>
is recommended, but not required.

If <code>QuotaLock</code> is used, it is strongly advised that the
configured lock file not be on an NFS (or any other network) filesystem.

<hr>
<h3><a name="QuotaLog">QuotaLog</a></h3>
Syntax: QuotaLog file|&quot;none&quot; 
Default: None 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_quotatab 
Compatibility: 1.2.5rc2 and later</a>

The <code>QuotaLog</code> directive is used to specify a log file for
<code>mod_quotatab</code> reporting, and can be done a per-server basis.
The file parameter must be the full path to the file to use for
logging. Note that this path must not be to a world-writeable
directory and, unless <code>AllowLogSymlinks</code> is explicitly set to
on (generally a bad idea), the path must not be a symbolic
link.

If file is &quot;none&quot;, no logging will be done at all; this
setting can be used to override a <code>QuotaLog</code> setting inherited from
a <code>&lt;Global&gt;</code> context.

<hr>
<h3><a name="QuotaOptions">QuotaOptions</a></h3>
Syntax: QuotaOptions opt1 ... 
Default: None 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_quotatab 
Compatibility: 1.3.1rc1 and later

The <code>QuotaOptions</code> directive is used to configure various optional
behavior of <code>mod_quotatab</code>.

Example:
<pre>
 QuotaOptions ScanOnLogin
</pre>

The currently implemented options are:
<ul>
 <li><code>ScanOnLogin</code> 
 
 If configured, this causes <code>mod_quotatab</code> to recursively
 scan the user's home directory when the user logs in, and to update
 the tally entry for that user, if any, with the number of bytes and
 files found. Note that these scans will cause a longer
 login time for the user, depending on the size of their home directory.

Note that this scanning will only happen if the configured
 limits for the user have either a bytes-in value greater than zero or
 a files-in value greater than zero. (These are the only two limits
 related to upload, hence why <code>ScanOnLogin</code> only goes into
 effect based on them.)
 </li>
</ul>

<hr>
<h3><a name="QuotaShowQuotas">QuotaShowQuotas</a></h3>
Syntax: QuotaShowQuotas on|off 
Default: on 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_quotatab 
Compatibility: 1.2.5rc2 and later</a>

The <code>QuotaShowQuotas</code> directive can be used to enable/disable
<code>mod_quotatab</code>'s response to a <code>SITE QUOTA</code> request.
For some sites, revealing the current quota information may be considered
an unnecessary, perhaps even detrimental, information leak; other sites
may consider this a definite feature.

<hr>
<h3><a name="QuotaTallyTable">QuotaTallyTable</a></h3>
Syntax: QuotaTallyTable source-type:source-info 
Default: None 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_quotatab 
Compatibility: 1.2.5rc2 and later</a>

This directive configures the information necessary for the module to locate
and use the table containing the quota tally, or the current byte/file
counts for users, groups, classes, etc, and is required for
<code>mod_quotatab</code> to function. Note that &quot;groups&quot; here
refers to the groups of which the user is a member, the same groups as used
for filesystem permissions; &quot;classes&quot; refers to connection
<a href="../howto/Classes.html">classes</a>.

Please consult the relevant <a href="#submodule">submodule</a> documentation
for details on that module's syntax for this configuration directive.

See also: <a href="#QuotaLimitTable">QuotaLimitTable</a>

<hr>

<h3><a name="SITE_QUOTA">SITE QUOTA</a></h3>

The <code>SITE QUOTA</code> command will display the quota, both the limit
and the current tally, to the client. This <code>SITE</code> command accepts
no parameters, and can only be used once the client has successfully logged
in.

Example:
<pre>
ftp> quote SITE QUOTA
200-The current quota for this session are [current/limit]:
 Name: tj
 Quota Type: User
 Per Session: True
 Limit Type: Hard
 Uploaded Kb: unlimited
 Downloaded Kb: unlimited
 Transferred Kb: unlimited
 Uploaded files: 1/1
 Downloaded files: unlimited
 Transferred files: unlimited
200 Please contact root@familiar.castaglia.org if these entries are inaccurate
ftp> 
</pre>
Use of this <code>SITE</code> command can be controlled via
<code>&lt;Limit&gt;</code>, e.g.:
<pre>
 &lt;Limit SITE_QUOTA&gt;
 AllowUser tj
 DenyAll
 &lt;/Limit&gt;
</pre>

Like many <code>SITE</code> commands, the FTP client will probably not
recognize or support <code>SITE QUOTA</code>. Hopefully the client does
have the ability to send arbitrary commands to the server, as the common
<code>ftp(1)</code> client does via <code>quote</code>.

The email address displayed in the <code>SITE QUOTA</code> output can be
configured via the <a href="http://www.proftpd.org/docs/directives/linked/config_ref_ServerAdmin.html"><code>ServerAdmin</code></a> directive.

<hr>

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

To use <code>mod_quotatab</code>'s functionality, you must first define the
tables that together contain the quota information.

<a name="QuotaTables"></a>
There are two such quota tables: one table, called the limit table for
providing quota information about the absolute byte/file limits for
users, groups, and classes, and a separate table, called the tally table
for maintaining the current tally, or number of bytes/files used, for
those same users, groups, and classes. (Note that &quot;groups&quot; here
refers to the groups of which the user is a member, the same groups as used
for filesystem permissions; &quot;classes&quot; refers to connection
<a href="../howto/Classes.html">classes</a>.) This separation of information
allows for a configuration such as using LDAP to efficiently distribute the
limit information, and local SQL databases for efficiently storing the tally.
The limit table is considered a read-only table, and is only accessed at the
start of session in order to determine what the session limits should be. The
tally table is accessed in read-write mode, and is updated after the relevant
FTP commands have been processed.

This module was not explicitly designed for easy interaction with other
applications, but rather for other criteria:
<ul>
 <li>Efficient lookups and updates
 <li>No need for <code>~/.quota</code> files
 <li>No need of requirement for root privileges to access quotas
 <li>Easy support for an abstraction layer for storing quota information in
 other formats
 <li>Support for a <code>SITE</code> command that allows users to view their current quotas
</ul>

This module maintains its quotas based solely on FTP commands - it does not
enforce quotas based on files that may have been added, deleted, or moved
via shell access or any mechanism other than through the <code>proftpd</code>
server.

<a name="QuotaLookup"></a>
When a client logs in, assuming <code>QuotaEngine</code> is on,
<code>mod_quotatab</code> will check the limit table for the record most
appropriate for that client. This check first examines the table for records
of type <code>user</code> that match the client's login name.

If no such matching records are found, it checks for records of type
<code>group</code> that match any of the user's groups (both primary and
supplemental). If there are multiple <code>group</code>-type limits
available and applicable to the user's groups, which one is used? The
<code>mod_quotatab</code> module first checks for a quota limit for the
user's primary group. If there is a <code>group</code> limit for
the user's primary group, that limit is used. Otherwise, the supplemental
groups for the user are checked, in the order returned by the authenticating
module (e.g. <code>mod_auth_unix</code>, <code>mod_sql</code>,
<code>mod_ldap</code>, etc).

If no such matching <code>group</code> quotas are found, the
<code>mod_quotatab</code> will check for records of type <code>class</code>
that belong to the class (if enabled) from which the client is connecting.
The order of classes matched is the order in which the classes are defined
in the <code>proftpd.conf</code> file.

If still no matching records are found, the table will be searched for a
record of type <code>all</code>; if absent, the module will assume that no
quotas apply to the client.

Note that there is only one type of limit in effect at a given
time; <code>mod_quotatab</code> does not combine multiple
user/group/class/all limits for the same client. The module was designed
such that only one limit (and its corresponding tally) would be enforced/used
for a given session. In the case of multiple applicable <code>group</code>
or <code>class</code> type quotas, only the matching quota limit and
tally will be used and updated. Currently, there is no support for multiple
simultaneous (or "layered") limits/tallies.

Once the limits for the current session have been established,
<code>mod_quotatab</code> examines the tally table to see what the current
numbers in the matching tally record are. Should the client have an
applicable limit record but no matching tally record, the module will
initialize a new record in the tally table. If the limit record specifies
that quotas are per-session, <code>mod_quotatab</code> will ignore any
existing tally records, and will not update the tallies.

For the purposes of tracking the number of uploaded bytes/files,
the tally will be adjusted accordingly upon use of the following FTP commands:
<code>APPE</code> (bytes only), <code>DELE</code>, <code>STOR</code>, and
<code>STOU</code>. The number of bytes used for the calculation will be
determined from the difference in file size of the file in question.

For the purposes of tracking the number of downloaded bytes/files,
the tally will be adjusted accordingly upon use of the following FTP commands:
<code>RETR</code>. The number of bytes used for the calculation will be
determined from the number of bytes sent to the client.

For the purposes of tracking the number of transferred bytes/files,
the tally will be adjusted accordingly upon use of the following FTP commands:
<code>APPE</code> (bytes only), <code>DELE</code>, <code>RETR</code>,
<code>STOR</code>, and <code>STOU</code>. The number of bytes used for
the calculation will be determined from the number of bytes sent to the
client. This type of limit allows for byte/file limits to be set that
encompass both uploads and downloads.

Note that if all three types of quotas are set (upload, download, and
transfer), any quota reached will cause denial of FTP commands. This means
that a high upload quota will never be reached if a low transfer quota is
in effect. This holds true for bytes and files quota. For example, if
a user has a limited number of both bytes and files to be uploaded in their
limit record, the first limit reached (bytes or files) is the effective
limit. Caveat emptor.

For any quota limit that is set as &quot;unlimited&quot;,
<code>mod_quotatab</code> will not keep the tally. Many site administrators
might want this ability, for accounting purposes. However, that ability is
outside of the intended design of this module; other logging modules are
much better suited for accounting purposes (e.g. <code>mod_sql</code>'s
<code>SQLLog</code> directive).

A &quot;hard&quot; limit type means that a user's tally will never
be allowed to exceed the limit; any file uploaded that exceeds the user's
quota limit will be deleted, and the tally will not be incremented. A
&quot;soft&quot; limit type, on the other hand, is a little less strict,
for it will allow a user to exceed the quota limit by one file only. For
example, assume a user's tally is close their limit. That user uploads
a large file, one that pushes the tally up over the quota limit. If their
limit type is &quot;hard&quot;, the large file will be deleted once uploaded,
and a message returned to the client informing them of this. If the user's
limit type is &quot;soft&quot;, the large file will be allowed, but any
other uploads are denied (until the user deletes some files, and brings
their tally back down below the quota limit).

If any developers wish to make use of <code>mod_quotatab</code>'s quota
information, or to develop a new submodule, there is developer documentation
available <a href="http://www.castaglia.org/proftpd/doc/devel-guide/advanced/Quotatab/">here</a>.

<a name="QuotaDisplay"></a>
<code>Display</code> Variables 
The following variables are provided by <code>mod_quotatab</code>, and
can be used in any <code>Display</code> file (e.g.
<code>DisplayLogin</code>) other than <code>DisplayConnect</code>. The
values for the variables are not known when the client connects to the
daemon, hence why the variables are not useful in a <code>DisplayConnect</code>
file.
<pre>
 %{mod_quotatab.limit.bytes_in}
 %{mod_quotatab.limit.bytes_out}
 %{mod_quotatab.limit.bytes_xfer}
 %{mod_quotatab.limit.files_in}
 %{mod_quotatab.limit.files_out}
 %{mod_quotatab.limit.files_xfer}
 %{mod_quotatab.tally.bytes_in}
 %{mod_quotatab.tally.bytes_out}
 %{mod_quotatab.tally.bytes_xfer}
 %{mod_quotatab.tally.files_in}
 %{mod_quotatab.tally.files_out}
 %{mod_quotatab.tally.files_xfer}
</pre>
Note that the values for the various byte variables honor any
<a href="#QuotaDisplayUnits"><code>QuotaDisplayUnits</code></a> setting.

<hr>
<h2><a name="Installation">Installation</a></h2>
Follow the usual steps for using third-party modules in ProFTPD: 
<pre>
 $ ./configure --with-modules=mod_quotatab:...
 $ make
 $ make install
</pre>
where the list of modules, including <code>mod_quotatab</code>, will depend on
the types of quota tables you wish to support.

For using file-based quota tables, include the <code>mod_quotatab_file</code>
submodule, e.g.:
<pre>
 --with-modules=mod_quotatab:mod_quotatab_file
</pre>
or:
<pre>
 --enable-dso --with-shared=mod_quotatab:mod_quotatab_file
</pre>

For using LDAP-based quota limit tables, include <code>mod_quotatab_ldap</code>
in addition to either <code>mod_quotatab_file</code> or
<code>mod_quotatab_sql</code>:
<pre>
 --with-modules=mod_quotatab:mod_quotatab_file:mod_quotatab_ldap
</pre>
or:
<pre>
 --enable-dso --with-shared=mod_quotatab:mod_quotatab_file:mod_quotatab_ldap
</pre>
Note that file- or SQL-based tally tables are needed since
<code>mod_quotatab_ldap</code> cannot handle tally tables, only limit tables.
<code>mod_quotatab_ldap</code> also requires a correct installation of the
<code>mod_ldap</code> module.

For using SQL-based quota tables, include the <code>mod_quotatab_sql</code>
submodule, e.g.:
<pre>
 --with-modules=mod_quotatab:mod_quotatab_sql
</pre>
or:
<pre>
 --enable-dso --with-shared=mod_quotatab:mod_quotatab_sql
</pre>
And, if you wish to support file- and SQL-based quota tables:
<pre>
 --with-modules=mod_quotatab:mod_quotatab_file:mod_quotatab_sql
</pre>
or:
<pre>
 --enable-dso --with-shared=mod_quotatab:mod_quotatab_file:mod_quotatab_sql
</pre>
Note that SQL tables require that a correct installation of
<code>mod_sql</code> (and any of its backend modules) also be used.
Consult the <code>mod_sql</code> documentation for installation instructions
for that module.

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Code Editor : mod_quotatab.html