Re: [Proftpd-user] ProFTPD 1.3.7a : Various BanOnEvent ClientConnectRate rules in server config section

TJ,

Thanks for your quick reply.

Sorry, I did not clearly described the situation.

I try again....

Up till now, I have create Client-IP Classes to be able to enable 
banning client for connecting too frequently with the Ban-rule 
ClientConnectRates for some Client-IP's and to turn banning completely 
off for the other Client-IP's.

But now I would like to turn on banning for ALL Client-IP's , but 
differentiate in the limit of the ClientConnectRate for specific 
Client-IP's.
So for Client-IP's that should connect frequently, I set the max. 
ClientConnectRate to 10 per minute.
For more frequently connecting clients, I set the max. ClientConnectRate 
to 20 per minute.
And for the rest of the Clients, I frequently, I set the max. 
ClientConnectRate to 5 per minute.

I create the next configuration in de Server Config:

<IfModule mod_dso.c>
         LoadModule                      mod_sql.c
         LoadModule                      mod_sql_sqlite.c
         LoadModule                      mod_sftp.c
         LoadModule                      mod_auth_otp.c
         LoadModule                      mod_ctrls_admin.c
         LoadModule                      mod_quotatab.c
         LoadModule                      mod_quotatab_file.c
         LoadModule                      mod_ban.c
         #ProFTPD v1.3.7rc4v7 compiled with DSO-module mod_ifsession
         LoadModule                      mod_ifsession.c
</IfModule mod_dso.c>

.......

<Class freq_conns>
         From 1.2.3.4       # A test server  1
</Class>

<Class morefreq_conns>
         From 5.6.7.8       # a Test server 2
</Class>

<IfModule mod_ban.c>
         BanEngine               on
         BanLog /export/org/proftpd/log/proftpd_ban.log
         BanTable /export/org/proftpd/etc/proftpd_ban.tab

         # Allow the FTP admin to manually add/remove bans
         BanControlsACLs         all allow user root,hpprgaaj,proftpd
         # If the same client reaches the MaxLoginAttempts limit 10 times
         # within 1 minutes, automatically add a ban for that client that
         # will expire after two hours.
         #
         BanOnEvent MaxLoginAttempts 2/00:05:00 01:00:00 "You are banned 
out for 1 hour"
         BanOnEvent RootLogin 1/00:01:00 02:00:00 "Stop connecting with 
root"
         BanOnEvent mod_auth.root-login 1/00:01:00 02:00:00 "Stop 
connecting with root"

         # Define that a banned client host in one VirtualHost is also 
banned in the other VirtualHost.
         BanOptions              MatchAnyServer

         <IfClass freq_conns>
                 # Set a specific ClientConnectRate for Client 
IP-classes that normally connect frequently
                 # or that are unknown users/client-IP's.
                 BanOnEvent ClientConnectRate 10/00:01:00 02:00:00 "Stop 
connecting frequently"
         </IfClass>

         <IfClass morefreq_conns>
                 # Set a specific ClientConnectRate for Client 
IP-classes that normally connect very frequently
                 BanOnEvent ClientConnectRate 20/00:01:00 02:00:00 "Stop 
connecting frequently"
         </IfClass>

         <IfClass !freq_conns AND !morefreq_conns>
                 # Set a specific ClientConnectRate for all other  
Client IP's
                 BanOnEvent ClientConnectRate 5/00:01:00 02:00:00 "Stop 
connecting frequently"
         </IfClass>
</IfModule>

However, this configuration does not work as expected:

1) It looks like that only the first occurence of the ClientConnectRate 
in the configuration is set, regardless of the Class for which it is meant.
      So, there was set a ban for the Client of Class "morefreq_conns" 
because of more than 10 connections/min. although in the config I 
specified a ClientConnectRate limit of 20/min.
      The Client of Class "freq_conns" will be banned at the 
ClientConnectRate of 10/min which is right.
      However, for the Class "morefreq_conns", I specified a limit of 
ClientConnectRate of 20/min - not 10/min.
      And so for the Class "freq_conns", the same limit was set : 10/min.
      You can see that as well with ftpdctl -s $CTRL_SOCK ban info -v -e
     ftpdctl: Banned Hosts:
     ftpdctl:   5.6.7.8
ftpdctl: Reason: ClientConnectRate autoban at Mon Jun 21 21:10:28 2021
ftpdctl: Expires: Mon Jun 21 23:10:28 2021 (in 7128 seconds)
ftpdctl: <VirtualHost>: ProFTPD RHEL Test Dropserver-SFTP 
(<dropserver-IP>#22)
ftpdctl:
ftpdctl: Ban Events:
ftpdctl: Event: ClientConnectRate
ftpdctl: Source: 1.2.3.4
ftpdctl: Occurrences: 8/*10*
ftpdctl: Entry Expires: 21 seconds
ftpdctl: <VirtualHost>: ProFTPD RHEL Test Dropserver-SFTP (10.52.129.70#22)

    Didn't I configure ProFTPD not right ?
Why is only the first Class for all Clients matched ?

2) In which ProFTPD log can I find the Class that ProFTPD daemon has 
defined for a connected client ?

3) Strange is that while the SFTP-connections are banned, the clients 
can connect with FTP to the same dropserver IP without problems.
    However, I specified "BanOptions MatchAnyServer".
    What do I do wrong ?

All comments and recommendations are appreciated.

Thanks in advance,

With regards,

Pieter de Gaaij

On 19 Jun 2021 03:45, TJ Saunders wrote:
>> Question: could it be made possible to configure different BanOnEvent
>> ClientConnectRate rules for different Classes ?
>>
>> Lets say:
>>
>> <Class manyconnects>
>>           From xxx.yyyy.zzzz.cccc
>> </Class>
>>
>> <Class lessconnects>
>>           From xxx.yyyy.zzzz.cccc
>> </Class>
> This should work -- assuming your different classes use different IP ranges, so that a given client only matches one of the defined classes.  Your example above uses the same IP ranges/DNS names, so it's hard to tell if that is what you are actually using.
>
> When a client connect, you should see the matching class found for it, if any, in the ProFTPD logs.
>
>> I think, now only the first rule is configured.
> What behavior are you observing, to indicate that perhaps only the first class is being matched, perhaps unexpectedly?
>
> Cheers,
> TJ
>
>
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