LDAP Plugin with openLDAP

[george1421]

@george1421 Ok after a little googling I’ve found a few things.

1. It appears openldap may need to have overlays turned on to enable the memberof function. I’m still not sure about this one. But what I found says that if overlays were turned on before the groups were created then you are ok, if it is turned on after the groups are created you will need to recreate the groups.

2. Here is the syntax of an example query ‘(&(objectClass=user)(sAMAccountName=yourUserName) (memberof=CN=YourGroup,OU=Users,DC=YourDomain,DC=com))’ Now this is for AD but the query can be changed to this: (&(objectClass=user)(uid=yourUserName) (memberof=CN=YourGroup,OU=Users,DC=YourDomain,DC=com)) I don’t have an openldap environment

ref: https://stackoverflow.com/questions/1032351/how-to-write-ldap-query-to-test-if-user-is-member-of-a-group for both points

[Fernando Gietz]

We can try to debug the @antonionardella 's code.

Make a copy of the file /var/www/[html/]fog/lib/plugin/ldap/class/ldap.class.php

#cp ldap.class.php ldap.class.php.ori

Let’s go to edit the ldap.class.php file, line 628 and insert the next code:

        $result = $this->_result($grpSearchDN, $filter, $attr);
//********* DEBUG ********************
        var_dump($grpSearchDN,$filter,$attr);
        exit;
//************************************
        if (false !== $result) {
            return 2;
        }
        /**
         * If no record is returned then user is not in the
         * admin group. Change the filter and check the mobile
         * group for membership.
         */

The var_dump function will write the value of the variables $grpSearchDN, $filter and $attr in the page of the browser. After do the changes, go to the validation page and enter the credentials and send us a screenshot.

In my case returns:

string(29) "ou=groups,dc=xxxx,dc=xxxx,dc=xxxx" string(77) "(&(|(name=aux.caunivel21))(member=CN=bcxxxx,OU=people,DC=xxxx,DC=xxxx,DC=xxxx))" array(1) { [0]=> string(6) "member" }

[antonionardella]

Hello @Fernando-Gietz, on Friday I’ll be working on that system again and let you know.

Thanks,
Antonio

[antonionardella]

@Fernando-Gietz here the result:

[Fernando Gietz]

Hi @antonionardella ,

With this output we can see that the filter is NULL and this is the problem
But the big question is why?

Please change the var_dump line with:

var_dump($grpSearchDN,$filter,$attr,$adminGroups,$userDN);

And paste the output.

[antonionardella]

Hi @Fernando-Gietz,

here the output:

It’s not working because the filter only works with this query:

(&(|(name=dsp))(memberuid=dsptest));

without ,ou=Users,dc=example,dc=com

as shown here:

@antonionardella said in LDAP Plugin with openLDAP:

@Fernando-Gietz and @george1421

Hello and thank you for your answers, thing is that the filter is putting

(&(|(name=dsp))(memberuid=uid=dsptest,ou=Users,dc=example,dc=com));

while it should be without =uid and ,ou=Users,dc=example,dc=com like so:

(&(|(name=dsp))(memberuid=dsptest));

Then I get an output with ldapsearch (see image)

I tried to look at the two functions authLDAP() and _getAccessLevel() but I miss enough understanding of PHP to find the extra =uid and ,ou=Users,dc=example,dc=com

Cheers,
Antonio

[Fernando Gietz]

I know but now the problem is why is the $filter variable NULL? is strange.

        $filter = sprintf(
            '(&(|(name=%s))(%s=%s))',
            implode(')(name=', (array)$adminGroups),
            $grpMemAttr,
            $this->escape($userDN, null, LDAP_ESCAPE_FILTER)
        );
        /**
         * The attribute to get.
         */
        $attr = array($grpMemAttr);
        /**
         * Read in the attributes
         */
        $result = $this->_result($grpSearchDN, $filter, $attr);

Are you sure that the $filter variable is well write in the var_dump() function? XD
The output of this variable must be:

(&(|(name=dsp))(memberuid=uid=dsptest,ou=Users,dc=****,dc=***))'

If you change the code to:

        $filter = sprintf(
            '(&(|(name=%s))(%s=%s))',
            implode(')(name=', (array)$adminGroups),
            $grpMemAttr,
//            $this->escape($userDN, null, LDAP_ESCAPE_FILTER)
            'dsptest'
        );
        /**
         * The attribute to get.
         */
        $attr = array($grpMemAttr);
        /**
         * Read in the attributes
         */
        $result = $this->_result($grpSearchDN, $filter, $attr);
        if (false !== $result) {
            return 2;
        }

UPDATED

[antonionardella]

Hello @Fernando-Gietz it works using that code!

[Fernando Gietz]

I’m glad but we’re cheating

If we erase the last change

$filter = sprintf(
               '(&(|(name=%s))(%s=%s))',
               implode(')(name=', (array)$adminGroups),
               $grpMemAttr,
               $this->escape($userDN, null, LDAP_ESCAPE_FILTER)
);

Ans setup the Search Base DN parameter only to dsptest, does work?

[antonionardella]

Hello,

I tried with Search Base DN set to:

• dsptest
• ou=dsptest
• ou=dsptest,dc=example,dc=com
• ou=dsp
• ou=dsp,dc=example,dc=com

with no luck:

[Fri Apr 05 10:10:09.017746 2019] [proxy_fcgi:error] [pid 9652] [client ::1:51122] AH01071: Got error 'PHP message: PHP Warning:  ldap_search(): Search: Invalid DN syntax in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: PHP Warning:  ldap_count_entries() expects parameter 2 to be resource, boolean given in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: Plugin LDAP::_result(). Search Method: search; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest)); Result: \nPHP message: Plugin LDAP::authLDAP() Search results returned false. Search DN: dsptest; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest))\n', referer: http://localhost/fog/management/index.php
[Fri Apr 05 10:45:05.644639 2019] [proxy_fcgi:error] [pid 9707] [client ::1:59212] AH01071: Got error 'PHP message: PHP Warning:  ldap_search(): Search: No such object in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: PHP Warning:  ldap_count_entries() expects parameter 2 to be resource, boolean given in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: Plugin LDAP::_result(). Search Method: search; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest)); Result: \nPHP message: Plugin LDAP::authLDAP() Search results returned false. Search DN: ou=dsptest,dc=example,dc=com; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest))\n', referer: http://localhost/fog/management/index.php
[Fri Apr 05 10:45:10.428643 2019] [proxy_fcgi:error] [pid 9681] [client ::1:59270] AH01071: Got error 'PHP message: PHP Warning:  ldap_search(): Search: No such object in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: PHP Warning:  ldap_count_entries() expects parameter 2 to be resource, boolean given in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: Plugin LDAP::_result(). Search Method: search; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest)); Result: \nPHP message: Plugin LDAP::authLDAP() Search results returned false. Search DN: ou=dsptest,dc=example,dc=com; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest))\n', referer: http://localhost/fog/management/index.php?node=home
[Fri Apr 05 10:46:43.542053 2019] [proxy_fcgi:error] [pid 9652] [client ::1:59972] AH01071: Got error 'PHP message: PHP Warning:  ldap_search(): Search: No such object in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: PHP Warning:  ldap_count_entries() expects parameter 2 to be resource, boolean given in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: Plugin LDAP::_result(). Search Method: search; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest)); Result: \nPHP message: Plugin LDAP::authLDAP() Search results returned false. Search DN: ou=dsptest; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest))\n', referer: http://localhost/fog/management/index.php
[Fri Apr 05 10:47:32.359197 2019] [proxy_fcgi:error] [pid 9650] [client ::1:60348] AH01071: Got error 'PHP message: PHP Warning:  ldap_search(): Search: No such object in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: PHP Warning:  ldap_count_entries() expects parameter 2 to be resource, boolean given in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: Plugin LDAP::_result(). Search Method: search; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest)); Result: \nPHP message: Plugin LDAP::authLDAP() Search results returned false. Search DN: ou=dsp; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest))\n', referer: http://localhost/fog/management/index.php
[Fri Apr 05 10:48:28.842830 2019] [proxy_fcgi:error] [pid 9648] [client ::1:60670] AH01071: Got error 'PHP message: PHP Warning:  ldap_search(): Search: No such object in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: PHP Warning:  ldap_count_entries() expects parameter 2 to be resource, boolean given in /var/www/html/fog/lib/plugins/ldap/class/ldap.class.php on line 124\nPHP message: Plugin LDAP::_result(). Search Method: search; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest)); Result: \nPHP message: Plugin LDAP::authLDAP() Search results returned false. Search DN: ou=dsp,dc=example,dc=com; Filter: (&(|(objectcategory=person)(objectclass=person))(cn=dsptest))\n', referer: http://localhost/fog/management/index.php

Cheers,
Antonio

[Fernando Gietz]

Hi @antonionardella ,

Ok the erorr is normal XD. I see two ways to solve your case:

1. Not use admin groups and all users are administrators, later you can restrict the access to the web UI using the AccessControl plugin.

2. Do a little change in your code:

        /**
         * Only one entry
         */
        $entries = $this->get_entries($result);
        /**
         * Pull out the user dn
         */
        $userDN = $entries[0]['dn'];
        /**
         * If use group match is used, get access level,
         * otherwise group scanning isn't used. Assume all
         * are admins.
         */
        if ($useGroupMatch) {
            $accessLevel = $this->_getAccessLevel($grpMemAttr, $userDN);
        } else {
            $accessLevel = 2;
        }

Change the 541 line in ldap.class.php file to:

        /**
         * Only one entry
         */
        $entries = $this->get_entries($result);
        /**
         * Pull out the user dn
         */
//        $userDN = $entries[0]['dn'];
           $userDN = $user;
        /**
         * If use group match is used, get access level,
         * otherwise group scanning isn't used. Assume all
         * are admins.
         */
        if ($useGroupMatch) {
            $accessLevel = $this->_getAccessLevel($grpMemAttr, $userDN);
        } else {
            $accessLevel = 2;
        }

I prefer the first one

[antonionardella]

Hi @Fernando-Gietz, I am terribly sorry, but making everyone an admin does not look like an option.
It’s less about the web UI access, but more about restricting users (see students) from deploying random images to the systems and breaking things or activating licenses of pre-imaged software.

What if the group would be called dsp, is it in no way possibile to limit the access only to this group here?
What is the issue exactly?

Thank you for your time.

Ciao,
Antonio

[Fernando Gietz]

@antonionardella said in LDAP Plugin with openLDAP:

Hi @Fernando-Gietz, I am terribly sorry, but making everyone an admin does not look like an option.
It’s less about the web UI access, but more about restricting users (see students) from deploying random images to the systems and breaking things or activating licenses of pre-imaged software.

OK, you are right if you have student in the same LDAP server. Then the second option XD

What if the group would be called dsp, is it in no way possibile to limit the access only to this group here?
What is the issue exactly?

the problem is the filter that the code construct, in your case this filter is bad and doesn t work.

Bad filter:

(&(|(name=dsp))(memberuid=uid=dsptest,ou=Users,dc=****,dc=***))

Good filter:

(&(|(name=dsp))(memberuid=dsptest))

To do it well, the $userDN variable value should be dsptest and not uid=dsptest,ou=Users,dc=xxx,dc=xxx. If you do the previous suggested change in the code, $userDN = $user;, the filter should be fine and the validation proccess works fine for all users.

[antonionardella]

Hello @Fernando-Gietz,

thanks for the awesome help and support, it works now as needed.

Is there something I should be aware or edit in our openLDAP implementation to make the plugin work correctly without editing the /var/www/[html/]fog/lib/plugin/ldap/class/ldap.class.php file?

Ciao,
Antonio