Re: server side filter plugin problem

On 2013-6-27 15:58, Bu Xiaobing wrote:
> On 2013-6-27 15:50, Paul Lesniewski wrote:
>> On Thu, Jun 27, 2013 at 12:36 AM, Bu Xiaobing <[email protected]> wrote:
>>> On 2013-6-27 15:14, Paul Lesniewski wrote:
>>>> On Thu, Jun 27, 2013 at 12:09 AM, Bu Xiaobing <[email protected]> wrote:
>>>>> On 2013-6-25 7:14, Paul Lesniewski wrote:
>>>>>>> I think the problem with setgroups(0, NULL): Operation not permitted has
>>>>>>> been resolved.
>>>>>>
>>>>>> If you don't say *how* -- explain carefully what you changed, what
>>>>>> your current settings are, then you leave us to guess.  This is
>>>>>> frustrating and you are less likely to receive any help this way.
>>>>>>
>>>>>>> At the first time I set
>>>>>>> 'SUID_LOCATION'  => array('VALUE' =>
>>>>>>> '/var/www/html/webmail/plugins/server_settings_backend/suid_backend/squirrelmail_server_settings_suid_backend'),
>>>>>>>
>>>>>>> I find in the /var/www/html/webmail/plugins/server_settings_backend also has
>>>>>>> a squirrelmail_server_settings_suid_backend, and the file permission is
>>>>>>> -rwsr-xr-x.
>>>>>>>
>>>>>>> So I change the SUID_LOCATION value to
>>>>>>> /var/www/html/webmail/plugins/server_settings_backend/squirrelmail_server_settings_suid_backend
>>>>>>
>>>>>> The only examples I can find point to the server_settings_backend
>>>>>> directory.  The copy of the suid_wrapper in the suid_backend directory
>>>>>> shouldn't be used in your configuration.  (I believe this is your
>>>>>> oversight, unless you can point out where there was a misleading
>>>>>> example.)
>>>>>>
>>>>>>> But get another error "Remote file name cannot contain "/"" in the
>>>>>>> /var/log/httpd/error_log.
>>>>>>
>>>>>> This is good in general.  If you really need directory traversal
>>>>>> (why?), read the docs on how to compile the suid wrapper.  And once
>>>>>> again, READ THE DOCS **BEFORE** you ask for help.
>>>>>>
>>>>>>> And if I set "$ssf_debug_server_settings_backend = 1" in the
>>>>>>> server_side_filters/config.php, and after I click "Options->Message Filters"
>>>>>>> on the web browser, the web page only display the following message:
>>>>>>>
>>>>>>> Unable to retrieve file from command
>>>>>>> "/var/www/html/webmail/plugins/server_settings_backend/squirrelmail_server_settings_suid_backend
>>>>>>> 'localhost' 'buxiaobing' 'get_file' '/home/buxiaobing/.mailfiter'
>>>>>>> '/var/local/squirrelmail/attach/xo4HqZ6WpSq6iUazfx1TLAmw3SEg6p9D'"
>>>>>>>
>>>>>>> Can't understand why will it retrieve the
>>>>>>> /var/local/squirrelmail/attach/xo4HqZ6WpSq6iUazfx1TLAmw3SEg6p9D file and
>>>>>>> this file is not exist.
>>>>>>>
>>>>>>>
>>>>>>> Bu Xiaobing
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>> Thanks for your help. I read the server_settings_backend/docs/SUID_BACKEND_ERRORS
>>>>> and find the problems and it works now!
>>>>
>>>> Thanks for reading the docs.  I'd just caution you again *against*
>>>> allowing directory traversal.  There is no reason you should need that
>>>> and it is less secure.
>>>>
>>>
>>> Do you mean I should not use SUID backend?
>>
>> I never said such a thing.
>>
>>> For now, I need SUID to save a kickoff file .forward
>>> which contains "|exec /usr/bin/procmail || exit 75" at /home/USER,
>>
>> Let the wrapper obtain the user home directory.  The SquirrelMail side
>> (the filters plugin) should only pass the name of the file (.forward)
>> and no path information.
>>
>>> So I can invoke procmail to do filter. And I compiled SUID
>>> with --enable-auth=imap to do authentication.
>>
>>
>
> I think I do as you suggest, the following is my server_side_filters/config.php
>
>   $filtering_kickoff_file = array(
>      'BACKEND'              => 'local_file',
>      'ACCESS_TYPE'          => array('VALUE' => 'SUID'),
>      'SUID_LOCATION'        => array('VALUE' => '/var/www/html/webmail/plugins/server_settings_backend/squirrelmail_server_settings_suid_backend'),
>      'FILE'                 => array('VALUE' => '.forward'),
>      'PARSE_PATTERN'        => array('VALUE' => '#^(\"\|exec /usr/bin/procmail \|\| exit 75\")$#m'),
>      'NEW_SETTING_TEMPLATE' => array('VALUE' => "\"|exec /usr/bin/procmail || exit 75\"\n"),
>      'PATTERN_GROUP_NUMBER' => array('VALUE' => 1),
>      'MAX_SEQUENTIAL_EMPTY_LINES' => 3,
>      'TREAT_AS_EMPTY_WHEN_NOT_FOUND' => array('VALUE' => 1),
>      // un-comment the following to add to the top of existing files
>      //'ADD_TO_TOP' => array('VALUE' => 1),
>   );
>
> Bu Xiaobing

And this:

  $filter_rules_storage_info = array(
     'BACKEND'               => 'local_file',
     'ACCESS_TYPE'           => array('VALUE' => 'SUID'),
     'SUID_LOCATION'         => array('VALUE' => '/var/www/html/webmail/plugins/server_settings_backend/squirrelmail_server_settings_suid_backend'),
     'FILE'                  => array('VALUE' => '.procmailrc'),
     'PARSE_PATTERN'         => array('VALUE' => "/^(.*)$/s"),
     'PATTERN_GROUP_NUMBER'  => array('VALUE' => 1),
     'NEW_SETTING_TEMPLATE'  => array('VALUE' => '%1'),
     'DELETE_WHEN_EMPTY'     => array('VALUE' => 1),
     'TREAT_AS_EMPTY_WHEN_NOT_FOUND' => array('VALUE' => 1),
     'SUID_DEBUG_OUTPUT'     => array('VALUE' => '/tmp/squirrelmail_server_settings_backend_suid_debug'),
  );

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