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

<body bgcolor=white>

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

<p>
The <code>mod_geoip</code> module uses the GeoIP library from MaxMind to
look up various geographic information for a connecting client:
<pre>
  <a href="http://www.maxmind.com/app/c">http://www.maxmind.com/app/c</a>
</pre>
This information can be used to set access controls for the server.

<p>
This module is contained in the <code>mod_geoip.c</code> file for
ProFTPD 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_geoip</code> is distributed with the
ProFTPD source code.

<p>
This product includes GeoLite data created by MaxMind, available from
<a href="http://www.maxmind.com/">http://www.maxmind.com/</a>.

<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="#GeoIPAllowFilter">GeoIPAllowFilter</a>
  <li><a href="#GeoIPDenyFilter">GeoIPDenyFilter</a>
  <li><a href="#GeoIPEngine">GeoIPEngine</a>
  <li><a href="#GeoIPLog">GeoIPLog</a>
  <li><a href="#GeoIPPolicy">GeoIPPolicy</a>
  <li><a href="#GeoIPTable">GeoIPTable</a>
</ul>

<hr>
<h3><a name="GeoIPAllowFilter">GeoIPAllowFilter</a></h3>
<strong>Syntax:</strong> GeoIPAllowFilter <em>filter1 pattern1 [filter2 pattern2 ...]</em><br>
<strong>Default:</strong> <em>none</em><br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_geoip<br>
<strong>Compatibility:</strong> 1.3.3rc1 and later

<p>
The <code>GeoIPAllowFilter</code> directive is used to configure ACLs based
on the geographic data provided by the GeoIP library.

<p>
Multiple <code>GeoIPAllowFilter</code> directives in the configuration are
supported; if <b>any</b> filter matches the connecting client, the connection
will be allowed.

<p>
The <em>filter</em> parameter specifies the GeoIP value to which to apply
the configured <em>pattern</em> for matching.  The possible <em>filter</em>
values are:
<ul>
  <li><code>AreaCode</code>
  <li><code>ASN</code>
  <li><code>City</code>
  <li><a href="http://www.maxmind.com/en/country_continent"><code>Continent</code></a>
  <li><a href="http://www.maxmind.com/en/iso3166"><code>CountryCode</code></a>
  <li><code>CountryCode3</code>
  <li><code>CountryName</code>
  <li><code>ISP</code>
  <li><code>Latitude</code>
  <li><code>Longitude</code>
  <li><code>NetworkSpeed</code>
  <li><code>Organization</code>
  <li><code>PostalCode</code>
  <li><code>Proxy</code>
  <li><code>RegionCode</code>
  <li><code>RegionName</code>
  <li><code>Timezone</code>
</ul>

<p>
The <em>pattern</em> parameter is <b>case-insensitive</b> regular expression 
that will be applied to the specified <em>filter</em> value, if available.

<p>
Note that as of <code>proftpd-1.3.6rc3</code> and later, the
<code>GeoIPAllowFilter</code> directive can also take a <em>single</em>
parameter which specifies a SQL query (via <code>mod_sql</code>'s
<a href="mod_sql.html#SQLNamedQuery"><code>SQLNamedQuery</code></a>), which
will be used to retrieve the <em>filter</em> and <em>pattern</em> values to use.

<p>
Examples:
<pre>
  # Allow clients with high-speed connections
  GeoIPAllowFilter NetworkSpeed corporate

  # Reject clients connecting from North America or South America
  GeoIPDenyFilter Continent (NA|SA)
</pre>
The following more complex configuration demonstrates what can be done using
SQL querires:
<pre>
  &lt;IfModule mod_sql.c&gt;
    ...
    SQLNamedQuery get-geo-allowed SELECT "filter_name, pattern FROM allowed_user_geo WHERE user_name = '%u'"
    SQLNamedQuery get-geo-denied SELECT "filter_name, pattern FROM denied_user_geo WHERE user_name = '%u'"
  &lt;/IfModule&gt;

  &lt;IfModule mod_geoip.c&gt;
    GeoIPEngine on

    GeoIPAllowFilter sql:/get-geo-allowed
    GeoIPDenyFilter sql:/get-geo-denied
  &lt;/IfModule&gt;
</pre>
The above assumes SQL tables with schema similar to the following (expressed
using SQLite syntax):
<pre>
  CREATE TABLE allowed_user_geo (
    user_name TEXT,
    filter_name TEXT,
    pattern TEXT
  );

  CREATE TABLE denied_user_geo (
    user_name TEXT,
    filter_name TEXT,
    pattern TEXT
  );

  # Note that we create separate indexes, to allow for multiple rows per user
  CREATE INDEX allowed_user_geo_name_idx ON allowed_user_geo (user_name);
  CREATE INDEX denied_user_geo_name_idx ON denied_user_geo (user_name);
</pre>

<p>
<hr>
<h3><a name="GeoIPDenyFilter">GeoIPDenyFilter</a></h3>
<strong>Syntax:</strong> GeoIPDenyFilter <em>filter1 pattern1 [filter2 pattern2 ...]</em><br>
<strong>Default:</strong> <em>none</em><br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_geoip<br>
<strong>Compatibility:</strong> 1.3.3rc1 and later

<p>
The <code>GeoIPDenyFilter</code> directive is used to configure ACLs based
on the geographic data provided by the GeoIP library.

<p>
Multiple <code>GeoIPDenyFilter</code> directives in the configuration are
supported; if <b>any</b> filter matches the connecting client, the connection
will be rejected.

<p>
Note that as of <code>proftpd-1.3.6rc3</code> and later, the
<code>GeoIPDenyFilter</code> directive can also take a <em>single</em>
parameter which specifies a SQL query (via <code>mod_sql</code>'s
<a href="mod_sql.html#SQLNamedQuery"><code>SQLNamedQuery</code></a>), which
will be used to retrieve the <em>filter</em> and <em>pattern</em> values to use.

<p>
See <a href="#GeoIPAllowFilter"><code>GeoIPAllowFilter</code></a> for
a description of the directive syntax and parameters.

<p>
<hr>
<h3><a name="GeoIPEngine">GeoIPEngine</a></h3>
<strong>Syntax:</strong> GeoIPEngine <em>on|off</em><br>
<strong>Default:</strong> <em>off</em><br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_geoip<br>
<strong>Compatibility:</strong> 1.3.3rc1 and later

<p>
The <code>GeoIPEngine</code> directive enables or disables the module's
lookup of geographic information for a connecting client, and subsequent
enforcement of any configured ACLs.

<p>
<hr>
<h3><a name="GeoIPLog">GeoIPLog</a></h3>
<strong>Syntax:</strong> GeoIPLog <em>file|"none"</em><br>
<strong>Default:</strong> <em>None</em><br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_geoip<br>
<strong>Compatibility:</strong> 1.3.3rc1 and later

<p>
The <code>GeoIPLog</code> directive is used to specify a log file for
<code>mod_geoip</code>'s reporting on a per-server basis.  The <em>file</em>
parameter given must be the full path to the file to use for logging.

<p>
Note that this path must <b>not</b> be to a world-writable directory and,
unless <code>AllowLogSymlinks</code> is explicitly set to <em>on</em>
(generally a bad idea), the path must <b>not</b> be a symbolic link.

<p>
<hr>
<h3><a name="GeoIPPolicy">GeoIPPolicy</a></h3>
<strong>Syntax:</strong> GeoIPPolicy <em>"allow,deny"|"deny,allow"</em><br>
<strong>Default:</strong> GeoIPPolicy allow,deny<br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_geoip<br>
<strong>Compatibility:</strong> 1.3.5rc1 and later

<p>
The <code>GeoIPPolicy</code> directive determines whether the
<code>mod_geoip</code> module will allow a connection by default or not.

<p>
If <code>GeoIPPolicy</code> is configured using <em>"allow,deny"</em> (which
is the default setting), then the <code>mod_geoip</code> module will allow the
connection, <i>unless</i> the connecting client is rejected by <i>any</i>
<a href="#GeoIPDenyFilter"><code>GeoIPDenyFilter</code></a> rules.

<p>
If <code>GeoIPPolicy</code> is configured using <em>"deny,allow"</em>, then
the <code>mod_geoip</code> module will <b>reject</b> any connection,
<i>unless</i> the connecting client matches any configured
<a href="#GeoIPAllowFilter"><code>GeoIPAllowFilter</code></a> rules.

<p>
<hr>
<h3><a name="GeoIPTable">GeoIPTable</a></h3>
<strong>Syntax:</strong> GeoIPTable <em>path</em> <em>[flags]</em><br>
<strong>Default:</strong> <em>None</em><br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code><br>
<strong>Module:</strong> mod_geoip<br>
<strong>Compatibility:</strong> 1.3.3rc1 and later

<p>
The <code>GeoIPTable</code> directive is used to a GeoIP database file
for use by the GeoIP library.  The <em>path</em> parameter given must be the
full path to the database file.

<p>
If no <code>GeoIPTable</code> directive is configured, then the GeoIP library
will use the default GeoIP Country database file installed with the library.
Otherwise, <b>only</b> the database files configured via <code>GeoIPTable</code>
directives will be used.

<p>
Multiple <code>GeoIPTable</code> directives can be used to configure
multiple different GeoIP database files for use at the same time.

<p>
The possible <em>flags</em> values supported are:
<ul>
  <li><code>Standard</code>
    <p>
    Reads the database from the filesystem; uses the least memory but causes
    database to be read for each connection.
  </li>

  <p>
  <li><code>MemoryCache</code>
    <p>
    Loads the database into memory; faster performance but uses the most
    memory.  Tables configured with <code>MemoryCache</code> are loaded
    into the parent process memory, avoiding the need to read them for
    each connection.
  </li>

  <p>
  <li><code>CheckCache</code>
    <p>
    Causes the GeoIP library to check for database updates.  If the database
    has been updated, the library will automatically reload the file and/or
    memory cache.
  </li>

  <p>
  <li><code>IndexCache</code>
    <p>
    Loads just the most frequently accessed index portion of the database
    into memory, resulting in faster lookups than <code>Standard</code> but
    less memory usage than <code>MemoryCache</code>.  This can be useful
    for larger databases such as GeoIP Organization and GeoIP City.
  </li>

  <p>
  <li><code>MMapCache</code>
    <p>
    Loads the database into <code>mmap</code> shared memory.
  </li>

  <p>
  <li><code>UTF8</code>
    <p>
    Tells the GeoIP library to return UTF8 strings for the data obtained
    from this database file.  By default, the GeoIP library uses ISO-8859-1
    encoded strings.
  </li>
</ul>
Multiple different flags can be configured.

<p>
Examples:
<pre>
  GeoIPTable /path/to/GeoIP.dat MemoryCache CheckCache
  GeoIPTable /path/to/GeoISP.dat Standard
  GeoIPTable /path/to/GeoIPCity.dat IndexCache
</pre>

<p>
<hr>
<h2><a name="Installation">Installation</a></h2>
The <code>mod_geoip</code> module requires that the GeoIP library be installed.
For including <code>mod_geoip</code> as a statically linked module:
<pre>
  $ ./configure --with-modules=mod_geoip
</pre>
Alternatively, <code>mod_geoip</code> could be built as a DSO module:
<pre>
  $ ./configure --with-shared=mod_geoip
</pre>
Then follow the usual steps:
<pre>
  $ make
  $ make install
</pre>
You may need to specify the location of the GeoIP header and library files in
your <code>configure</code> command, <i>e.g.</i>:
<pre>
  $ ./configure --with-modules=mod_geoip \
    --with-includes=/usr/local/geoip/include \
    --with-libraries=/usr/local/geoip/lib
</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_geoip</code> as a shared
module:
<pre>
  $ prxs -c -i -d mod_geoip.c
</pre>

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

<p>
<b>Access Controls</b><br>
If any <code>GeoIPAllowFilter</code> or <code>GeoIPDenyFilter</code>
directives are configured, the <code>mod_geoip</code> module applies them
against the geographic information retrieved from the GeoIP library.  First
any <code>GeoIPAllowFilter</code>s are checked.  If <i>any</i> of these
filters matches the connecting client's information, the connection is allowed.
Next, any <code>GeoIPDenyFilter</code>s are checked.  If <i>any</i> of these
filters matches the connecting client's information, the connection is closed.
Otherwise, the connection is allowed.

<p>
This means that if you wanted to reject connections from the US <i>except</i>
for connections from California, you might use something like this:
<pre>
  # Deny all connections from the US
  GeoIPDenyFilter CountryCode US

  # But allow connections from California
  GeoIPAllowFilter RegionCode CA
</pre>

<p>
<b>Environment Variables</b><br>
The <code>mod_geoip</code> module will set the following environment
variables whenever a client connects, assuming that the appropriate
GeoIP tables have been configured and the values are known for the connecting
client:
<ul>
  <li><code>GEOIP_AREA_CODE</code>
  <li><code>GEOIP_ASN</code>
  <li><code>GEOIP_CITY</code>
  <li><code>GEOIP_CONTINENT_CODE</code>
  <li><code>GEOIP_COUNTRY_CODE</code> (<i>two-letter country code</i>)
  <li><code>GEOIP_COUNTRY_CODE3</code> (<i>three-letter country code</i>)
  <li><code>GEOIP_COUNTRY_NAME</code>
  <li><code>GEOIP_ISP</code>
  <li><code>GEOIP_LATITUDE</code>
  <li><code>GEOIP_LONGITUDE</code>
  <li><code>GEOIP_NETSPEED</code>
  <li><code>GEOIP_ORGANIZATION</code>
  <li><code>GEOIP_POSTAL_CODE</code>
  <li><code>GEOIP_PROXY</code>
  <li><code>GEOIP_REGION</code>
  <li><code>GEOIP_REGION_NAME</code>
  <li><code>GEOIP_TIMEZONE</code>
</ul>
These values are also available in the <code>session.notes</code> table,
under keys of the names above.

<p>
<b>Example Configuration</b><br>

<pre>
  &lt;IfModule mod_geoip.c&gt;
    GeoIPEngine on
    GeoIPLog /path/to/ftpd/geoip.log

    # Load GeoLite city database into memory on server startup, and use
    # UTF8-encoded city names
    GeoIPTable /path/to/GeoLiteCity.dat MemoryCache UTF8

    # Add your GeoIPAllowFilter/GeoIPDenyFilter rules here
  &lt;/IfModule&gt;
</pre>

<p>
<b>Logging</b><br>
The <code>mod_geoip</code> module supports different forms of logging.  The
main module logging is done via the <code>GeoIPLog</code> directive.
For debugging purposes, the module also uses <a href="../howto/Tracing.html">trace logging</a>, via the module-specific log channels:
<ul>
  <li>geoip
</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 geoip:20
</pre>
The geographic information retrieved from the GeoIP library for the
connecting client is logged using this "geoip" trace log channel.  This trace
logging can generate large files; it is intended for debugging
use only, and should be removed from any production configuration.

<p>
<b>Suggested Future Features</b><br>
The following lists the features I hope to add to <code>mod_geoip</code>,
according to need, demand, inclination, and time:
<ul>
  <li>Configure a message to be sent to rejected clients
  <li>Support requiring <i>all</i> <code>GeoIPAllowFilter</code>/<code>GeoIPDenyFilter</code> to apply, in addition to <i>any</i>
</ul>

<p><a name="FAQ">
<b>Frequently Asked Questions</b><br>

<p><a name="GeoIPWhitelist">
<font color=red>Question</font>: How I can whitelist specific clients from
<code>mod_geoip</code>'s checking?<br>
<font color=blue>Answer</font>: You should be able to easily do this using
<a href="http://www.proftpd.org/docs/howto/Classes.html">classes</a> and the
<code>mod_ifsession</code> module.  For example:
<pre>
  &lt;Class geoip-whitelist&gt;
    From 1.2.3.4
  &lt;/Class&gt;

  &lt;IfModule mod_geoip.c&gt;
    # Add the normal mod_geoip directives here <b>except</b> <code>GeoIPEngine</code>
  &lt;/IfModule&gt;

  &lt;IfClass geoip-whitelist&gt;
    # Disable mod_geoip for the whitelisted clients
    GeoIPEngine off
  &lt;/IfClass&gt;

  &lt;IfClass !geoip-whitelist&gt;
    # Enable mod_geoip for all non-whitelisted clients
    GeoIPEngine on
  &lt;/IfClass&gt;
</pre>

<p><a name="GeoIPMultipleRules">
<font color=red>Question</font>: How I can require that a connection match
multiple rules, <i>e.g.</i> both a <code>RegionCode</code> <i>and</i> a
<code>CountryCode</code>?<br>
<font color=blue>Answer</font>: In a given <code>GeoIPAllowFilter</code> or
<code>GeoIPDenyFilter</code>, you can configure a <i>list</i> of
filters/patterns.  And <b>all</b> of these filters <b>must</b> be matched,
in order for that <code>GeoIPAllowFilter</code> or <code>GeoIPDenyFilter</code>
to be matched.  Thus you can use:
<pre>
  # Deny all connections, unless they are explicitly allowed
  GeoIPPolicy deny,allow

  # Allow only connections from TX, US
  GeoIPAllowFilter RegionCode TX CountryCode US
</pre>

<p><a name="GeoIPIPv6">
<font color=red>Question</font>: Does <code>mod_geoip</code> support IPv6?<br>
<font color=blue>Answer</font>: Yes, <em>assuming</em> that the IPv6
MaxMind tables are configured via <code>GeoIPTable</code>.  You can find
the free IPv6 country and city "legacy" files; see this MaxMind <a href="https://www.maxmind.com/en/ipv6-information-and-faq">IPv6 FAQ</a> for details.

<p>
<hr>
<font size=2><b><i>
&copy; Copyright 2010-2016 TJ Saunders<br>
 All Rights Reserved<br>
</i></b></font>
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