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Code Editor : mod_ban.html

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

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

The <code>mod_ban</code> module is designed to add dynamic &quot;ban&quot;
lists to <code>proftpd</code>. A ban prevents the banned user, host, or
class from logging in to the server; it does not prevent the banned
user, host, or class from connecting to the server.
<code>mod_ban</code> is not a firewall. The module also provides
automatic bans that are triggered based on configurable criteria.

This module is contained in the <code>mod_ban.c</code> file for
ProFTPD 1.2.x/1.3.x, and is not compiled by default.
Installation instructions are discussed <a href="#Installation">here</a>.
Detailed documentation on <code>mod_ban</code> usage can be found
<a href="#Usage">here</a>.

The most current version of <code>mod_ban</code> is distributed with the
proftpd source.

<h2>Author</h2>

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

<h2>Directives</h2>
<ul>
 <li><a href="#BanCache">BanCache</a>
 <li><a href="#BanCacheOptions">BanCacheOptions</a>
 <li><a href="#BanControlsACLs">BanControlsACLs</a>
 <li><a href="#BanEngine">BanEngine</a>
 <li><a href="#BanLog">BanLog</a>
 <li><a href="#BanMessage">BanMessage</a>
 <li><a href="#BanOnEvent">BanOnEvent</a>
 <li><a href="#BanTable">BanTable</a>
</ul>

<h2>Control Actions</h2>
<ul>
 <li><a href="#ban"><code>ban</code></a>
 <li><a href="#permit"><code>permit</code></a>
</ul>

<hr>
<h3><a name="BanCache">BanCache</a></h3>
Syntax: BanCache driver 
Default: None 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_ban 
Compatibility: 1.3.4rc2 and later

<hr>
<h3><a name="BanCacheOptions">BanCacheOptions</a></h3>
Syntax: BanCacheOptions opt1 ... optN 
Default: None 
Context: server config, <code>&lt;VirtualHost&gt;</code>, <code>&lt;Global&gt;</code> 
Module: mod_ban 
Compatibility: 1.3.4rc2 and later

The <code>BanCacheOptions</code> directive is used to configure various optional
caching behavior of <code>mod_ban</code>. Note: all of the configured
<code>BanCacheOptions</code> parameters must appear on the same line in
the configuration; only the first <code>BanCacheOptions</code> directive that
appears in the configuration is used.

Example:
<pre>
 BanCacheOptions UseJSON
</pre>

The currently implemented options are:
<ul>
 <li><code>MatchServer</code> 
 
 This option tells <code>mod_ban</code> to ignore cached entries unless
 they match the IP address/port of the server handling the FTP
 session. There might be other servers adding their own entries to
 a common cache, for example; it is for these situations that the
 <code>MatchServer</code> option should be used, to avoid false positives.
 </li>

<li><code>UseJSON</code> 
 
 This option tells <code>mod_ban</code> to store the ban rules in the
 cache as JSON-formatted data. This makes it possible for other tools
 to discover/display the cached ban rules.

Note that this option first appeared in
 <code>proftpd-1.3.6rc2</code>.
 </li>
</ul>

<hr>
<h3><a name="BanControlsACLs">BanControlsACLs</a></h3>
Syntax: BanControlsACLs actions|&quot;all&quot; &quot;allow&quot;|&quot;deny&quot; &quot;user&quot;|&quot;group&quot; list 
Default: None 
Context: server config 
Module: mod_ban 
Compatibility: 1.2.10rc1 and later

The <code>BanControlsACLs</code> directive configures access lists of
users or groups who are allowed (or denied) the ability to
use the actions implemented by <code>mod_ban</code>. The default
behavior is to deny everyone unless an ACL allowing access has been explicitly
configured.

If &quot;allow&quot; is used, then list, a comma-delimited list
of users or groups, can use the given actions; all
others are denied. If &quot;deny&quot; is used, then the list of
users or groups cannot use actions all others are
allowed. Multiple <code>BanControlsACLs</code> directives may be used to
configure ACLs for different control actions, and for both users and groups.

The actions provided by <code>mod_ban</code> are &quot;ban&quot;
and &quot;permit&quot;.

Examples:
<pre>
 # Allow only user root to ban and permit users
 BanControlsACLs all allow user root
</pre>

<hr>
<h3><a name="BanEngine">BanEngine</a></h3>
Syntax: BanEngine on|off 
Default: off 
Context: server config 
Module: mod_ban 
Compatibility: 1.2.10rc1 and later

The <code>BanEngine</code> directive enables or disables the banning of
sessions by <code>mod_ban</code>. If it is set to off this module
does no banning. Use this directive to disable the module instead of
commenting out all <code>mod_ban</code> directives.

<hr>
<h3><a name="BanLog">BanLog</a></h3>
Syntax: BanLog path|&quot;none&quot; 
Default: None 
Context: server config 
Module: mod_ban 
Compatibility: 1.2.10rc1 and later

The <code>BanLog</code> directive is used to specify a log file for
<code>mod_ban</code> reporting and debugging. The path 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 path is &quot;none&quot;, no logging will be done at all.

<hr>
<h3><a name="BanMessage">BanMessage</a></h3>
Syntax: BanMessage mesg 
Default: None 
Context: server config 
Module: mod_ban 
Compatibility: 1.2.10rc1 and later

The <code>BanMessage</code> directive configures a message that will be
sent to clients that have been banned. This message may contain the
following variables:
<ul>
 <li><code>%a</code>: client IP address
 <li><code>%c</code>: client class (if none, will be empty)
 <li><code>%u</code>: USER name (if none, will be empty)
</ul>

Example:
<pre>
 BanMessage "Host %a has been banned"
</pre>

<hr>
<h3><a name="BanOnEvent">BanOnEvent</a></h3>
Syntax: BanOnEvent event freq expires [mesg] 
Default: None 
Context: server config 
Module: mod_ban 
Compatibility: 1.2.10rc1 and later

The <code>BanOnEvent</code> directive is used to configure a &quot;rule&quot;
that is triggered whenever the named event occurs. The currently
supported events are:

<table border=1 summary="Ban Events">
 <tr>
 <td>Directive</td>
 <td>Class/Host/User Ban</td>
 </tr>

<tr>
 <td><code>AnonRejectPasswords</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>BadProtocol</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>ClientConnectRate</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>EmptyPassword</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>MaxClientsPerClass</code></td>
 <td>Class ban</td>
 </tr>

<tr>
 <td><code>MaxClientsPerHost</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>MaxClientsPerUser</code></td>
 <td>User ban</td>
 </tr>

<tr>
 <td><code>MaxCommandRate</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>MaxConnectionsPerHost</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>MaxHostsPerUser</code></td>
 <td>User ban</td>
 </tr>

<tr>
 <td><code>MaxLoginAttempts</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>RootLogin</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>TimeoutIdle</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>TimeoutLogin</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>TimeoutNoTransfer</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>TLSHandshake</code></td>
 <td>Host ban</td>
 </tr>

<tr>
 <td><code>UnhandledCommand</code></td>
 <td>Host ban</td>
 </tr>
</table>

An event is generated whenever one of these limits is reached by a client.

The freq parameter should be formatted as:
<pre>
 N/hh:mm:ss
</pre>
where N is the number of occurrences, and <code>hh:mm:ss</code>
specifies a number of hours, minutes, and seconds. This parameter says
that if N occurrences of event happen within the given
time interval, then a ban is automatically added. The IP address of
the connecting client is banned when the following event rules are
triggered: <code>AnonRejectPasswords</code>, <code>BadProtocol</code>,
<code>MaxCommandRate</code>, <code>MaxClientsPerHost</code>,
<code>MaxConnectionsPerHost</code>, <code>MaxLoginAttempts</code>,
<code>TimeoutIdle</code>, <code>TimeoutNoTransfer</code>, and
<code>UnhandledCommand</code>. The class of the connected client, if any, is
banned when a rule for <code>MaxClientsPerClass</code> is triggered. Rules for
<code>MaxClientsPerUser</code> and <code>MaxHostsPerUser</code> will cause
the connected username to be banned.

The duration should be formatted as:
<pre>
 hh:mm:ss
</pre>
and specifies the numbers of hours, minutes, and seconds that the automatic
ban generated a <code>BanOnEvent</code> rule lasts. Unlike bans added via the
<a href="#ban">ban</a> <code>ftpdctl</code> control action, automatic bans do
not have infinite lifetimes.

An optional message, to be displayed to banned clients, can be configured.
If no such optional message is configured using the <code>BanOnEvent</code>
directive, then any <code>BanMessage</code> message will be displayed.

For example:
<pre>
 # Configure a rule to automatically ban scripts looking for anonymous
 # servers to which they can upload
 BanOnEvent AnonRejectPasswords 1/01:00:00 99:99:99

# Ban clients which connect too frequently. This rule bans clients
 # which connect more than 5 times within one minute. Include a special
 # message just for them.
 BanOnEvent ClientConnectRate 5/00:01:00 04:00:00 "Stop connecting frequently"
</pre>

See also: <a href="#BanMessage"><code>BanMessage</code></a>

<hr>
<h3><a name="BanTable">BanTable</a></h3>
Syntax: BanTable path 
Default: None 
Context: server config 
Module: mod_ban 
Compatibility: 1.2.10rc1 and later

The <code>BanTable</code> directive configures a path to a file
that <code>mod_ban</code> uses for handling its ban data. The given
path must be an absolute path. Note: this directive is
required for <code>mod_ban</code> to function. It is recommended
that this file not be on an NFS mounted partition.

Note that ban data is not kept across daemon stop/starts. That is,
once <code>proftpd</code> is shutdown, all current ban data is lost.

<hr>
<h2>Control Actions</h2>

<hr>
<h3><a name="ban"><code>ban</code></a></h3>
Syntax: ftpdctl ban class|host|info|user [-s address#port] name1 [name2 ...] 
Purpose: Add a ban or display ban information

The <code>ban</code> action is used to add bans to the <code>mod_ban</code>
lists. For example, to ban a user:
<pre>
 ftpdctl ban user dave
</pre>
This will create a ban rule for user 'dave' for all virtual servers in
your <code>proftpd.conf</code>. If you want to create such a ban rule, but
only for one specific <code>&lt;VirtualHost&gt;</code>, use the <code>-s</code>
command-line option, e.g.:
<pre>
 ftpdctl ban user -s 1.2.3.4#21 dave
</pre>
This example will create the user 'dave' ban rule for the
<code>&lt;VirtualHost&gt;</code> handling IP address 1.2.3.4, port 21.
The <code>-s</code> command-line option applies to host and
class bans as well.

To ban specific hosts, you can use either IP addresses or DNS names:
<pre>
 ftpdctl ban host 1.2.3.4 5.6.7.8
 ftpdctl ban host gw.evil.com
</pre>
Banning a class works the same way:
<pre>
 ftpdctl ban class anonftp
</pre>

The info parameter is used to view information on current bans.
Example listing:
<pre>
 # ftpdctl ban info
 ftpdctl: Banned Hosts:
 ftpdctl: 127.0.0.1
</pre>
Or, if you wish to see more information, use the <code>-v</code> option:
<pre>
 # ftpdctl ban info -v
 ftpdctl: Banned Hosts:
 ftpdctl: 127.0.0.1
 ftpdctl: Reason: MaxLoginAttempts autoban at Wed May 19 14:59:25 2004
 ftpdctl: Expires: Wed May 19 14:59:55 2004 (in 24 seconds)
 ftpdctl: &lt;VirtualHost&gt; ServerName (1.2.3.4#21)
</pre>
It is also possible to see the state of ban event rules, using the
<code>-e</code> option:
<pre>
 # ftpdctl ban info -e
 ftpdctl: No bans
 ftpdctl: 
 ftpdctl: Ban Event Entries:
 ftpdctl: Event: MaxLoginAttempts
 ftpdctl: Source: 127.0.0.1
 ftpdctl: Occurrences: 1/2
 ftpdctl: Entry Expires: 589 seconds
</pre>
This shows that no bans are currently in effect, and that a
<code>BanOnEvent</code> has been configured for the
<code>MaxLoginAttempts</code> event. That event has occurred once, and
will need to happen one more time within 589 seconds in order for an
automatic ban to be added.

See also: <a href="#permit"><code>permit</code></a>

<hr>
<h3><a name="permit"><code>permit</code></a></h3>
Syntax: ftpdctl permit class|host|user [-s address#port] name1 [name2 ...] 
Purpose: Permit banned clients to connect

The <code>permit</code> action is used to remove a ban for users, hosts,
and classes:
<pre>
 # ftpdctl permit user dave
 # ftpdctl permit user -s 1.2.3.4#21 dave
 # ftpdctl permit host 1.2.3.4 gw.evil.com
 # ftpdctl permit class anonftp
</pre>

See also: <a href="#ban"><code>ban</code></a>

<hr>
<h2><a name="Installation">Installation</a></h2>
The <code>mod_ban</code> module is distributed with ProFTPD. Simply follow
the normal steps for using third-party modules in ProFTPD, making sure to
include the <code>--enable-ctrls</code> configure option, which
<code>mod_ban</code> requires:
<pre>
 $ ./configure --enable-ctrls --with-modules=mod_ban
</pre>
To build <code>mod_ban</code> as a DSO module:
<pre>
 $ ./configure --enable-ctrls --enable-dso --with-shared=mod_ban
</pre>
Then follow the usual steps:
<pre>
 $ make
 $ make install
</pre>

For those with an existing ProFTPD installation, you can use the
<code>prxs</code> tool to add <code>mod_ban</code>, as a DSO module, to
your existing server:
<pre>
 $ prxs -c -i -d mod_ban.c
</pre>

<hr>
<h2><a name="Usage">Usage</a></h2>
The <code>mod_ban</code> module implements its bans by checking if a client
is banned, either by host or by class, when that client
connects to the server. Banned clients are immediately disconnected.
Banned users are checked after the client has sent the <code>USER</code>
and <code>PASS</code> commands; if that user has been banned, the client is
immediately disconnected.

Here is an example <code>mod_ban</code> configuration, demonstrating how
to configure an automatic ban for <code>MaxLoginAttempts</code>:
<pre>
 MaxLoginAttempts 1

&lt;IfModule mod_ban.c&gt;
    BanEngine on
    BanLog /var/log/proftpd/ban.log
    BanTable /var/data/proftpd/ban.tab

# If the same client reaches the MaxLoginAttempts limit 2 times
    # within 10 minutes, automatically add a ban for that client that
    # will expire after one hour.
    BanOnEvent MaxLoginAttempts 2/00:10:00 01:00:00

# Allow the FTP admin to manually add/remove bans
 BanControlsACLs all allow user ftpadm
 &lt;/IfModule&gt;
</pre>

By default, the <code>mod_ban</code> module allocate size for 512 bans.
In practice, this has seemed to work well. However, if you need to allocate
space for more bans, you will need to recompile proftpd, and use the
<code>CFLAGS</code> environment variable like so:
<pre>
 ./configure CFLAGS="-DBAN_LIST_MAXSZ=1024" ...
</pre>
or whatever your necessary ban list size is.

Logging 
The <code>mod_ban</code> module supports <a href="../howto/Tracing.html">trace logging</a>, via the module-specific log channels:
<ul>
 <li>ban
</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 ban:20
</pre>
This trace logging can generate large files; it is intended for debugging use
only, and should be removed from any production configuration.

<a name="FAQ"></a>
Frequently Asked Questions 
Question: Why does <code>mod_ban</code> not store ban
data across daemon stop/starts? 
Answer: The <code>mod_ban</code> module was not
designed to add yet another ACL mechanism to <code>proftpd</code>. For
persistent access control, there is the <code>&lt;Limit LOGIN&gt;</code>
section, the <code>mod_wrap</code> module, the <code>/etc/ftpusers</code>
file, and various other mechanisms. The purpose of <code>mod_ban</code>
is to provide dynamic, short-lived bans.

Question: What about having <code>proftpd</code> delay
sending responses to clients, say by 30 seconds or so? 
Answer: This is a bad idea. It would allow
malicious clients, who knew they were banned, to tie up your
<code>proftpd</code> processes, since those processes would be taking up
space, waiting before sending responses back to the client. This makes it
possible for those clients to use the delaying as a Denial of Service attack,
eventually tying up your available system resources with waiting
<code>proftpd</code> processes.

<a name="BanMaxLoginAttempts">
Question: I have the following, taken from
the example config above, configured for <code>mod_ban</code>, but it does not
appear to be working. Why not? 
<pre>
 # If the same client reaches the MaxLoginAttempts limit 2 times
 # within 10 minutes, automatically add a ban for that client that
 # will expire after one hour.
 BanOnEvent MaxLoginAttempts 2/00:10:00 01:00:00
</pre>
Answer: The most common reason is that the
<code>MaxLoginAttempts</code> directive does not function the way that many
assume it does.

The above <code>BanOnEvent</code> rule says that the same client (i.e.
source IP address) which reaches the <code>MaxLoginAttempts</code> limit
2 times within 10 minutes will be banned. If you test by connecting to
<code>proftpd</code>, trying a bad password once, disconnecting, then
connecting again and trying the same bad password again, you will not
be hitting the <code>MaxLoginAttempts</code> limit. Remember that the
<code>MaxLoginAttempts</code> directive configures a limit to the number
of bad login attempts for the same connection; it does not
configure limit on the number of bad login attempts across multiple
connections.

The default <code>MaxLoginAttempts</code> value for <code>proftpd</code>
is 3. Which means that simply connecting, trying a bad login attempt once,
then disconnecting, will not trigger the <code>MaxLoginAttempts</code> limit.
This is why the example configuration given above explicitly configures
the <code>MaxLoginAttempts</code> limit to be lower:
<pre>
 MaxLoginAttempts 1
</pre>
in order to make <code>mod_ban</code> behave the way that most administrators
assume it will. If you have not explicitly configured
<code>MaxLoginAttempts</code> lower, then this is probably why your
<code>BanOnEvent</code> rule is not taking effect as you expect.

Question: It looks like the <code>BanTable</code> file
I configured is untouched:
<pre>
 -rw-r--r-- 1 ftp ftp 0 2007-01-13 23:18 ban.table
</pre>
Does this mean that something is wrong, or that <code>mod_ban</code> is not
using that file? 

Answer: A <code>BanTable</code> file is needed,
just not in an obvious way. The <code>mod_ban</code> module stores its ban
information in a SysV shared memory segment. The configured
<code>BanTable</code> file is used a) to generate a unique name/ID for
the shared memory segment to use (and to see if a segment for that name/ID
already exists), and b) for locking, as when multiple sessions are
trying to update the shared memory segment at the same time. But
<code>mod_ban</code> does not write any data into that file itself, and hence
the last-modified-time of the file, and the file size, does not change much.

<a name="BanWhitelist">
Question: How can I configure a whitelist of IP
addresses, to be excluded from the effects of <code>mod_ban</code>? 
Answer: This can be done using a combination of
<a href="../howto/Classes.html">Classes</a> and the <a href="mod_ifsession.html"><code>mod_ifsession</code></a> module. For example:
<pre>
 &lt;Class whitelist&gt;
 From ...
 &lt;/Class&gt;

&lt;IfClass whitelist&gt;
    # Turn the mod_ban module off for whitelisted clients
    BanEngine off
  &lt;/IfClass&gt;

&lt;IfClass !whitelist&gt;
 # Make sure the mod_ban module is on for clients that are not whitelisted
 BanEngine on
 &lt;/IfClass&gt;
</pre>
Note that it is important to have both
<code>&lt;IfClass&gt;</code> sections in your configuration.

<a name="BanRootLogins">
Question: I would like to ban clients which try to
login as root. How would I do this? 
Answer: You would use the
<a href="#BanOnEvent"><code>BanOnEvent</code></a> directive, with an
event name of "mod_auth.root-login", thus:
<pre>
 # Ban clients which try to login as root. This bans clients which
 # try root logins twice within 10 minutes, banning them for 6 hours.
 BanOnEvent mod_auth.root-login 2/00:10:00 06:00:00
</pre>

<hr>

<hr>

</body>
</html>

${this.title}

Code Editor : mod_ban.html