LDAP Plugin with openLDAP

antonionardella · Mar 25, 2019, 7:48 AM

Hello,

first post here.

I am testing the FOG and openLDAP integration on one of my systems and have an issue with the filters.

Server

FOG Version: 1.5.5
OS: Debian 9

Client

Service Version:
OS: N/A

Description
I’ve added and setup the LDAP plugin, following different posts on the forums. So far I have found only M$ Active Directory configurations and I am not sure what is different with openLDAP.

The openLDAP user is named: dsptest
The openLDAP group is names: dsp

Here the sanitized ldapsearch result to have more information about the user dsptest with this query ldapsearch -x -D “uid=admin,ou=users,dc=example,dc=com” -W -H ldap://<IPADDRESS> -b “dc=example,dc=com” -s sub

# dsptest, Users, example.com
dn: uid=dsptest,ou=Users,dc=example,dc=com
sambaPwdCanChange: 0
uid: dsptest
sambaLogoffTime: 2147483647
givenName: dsptest
loginShell: /bin/bash
sambaAcctFlags: [UX]
uidNumber: 10001
sambaKickoffTime: 2147483647
objectClass: posixAccount
objectClass: top
objectClass: organizationalPerson
objectClass: inetOrgPerson
objectClass: shadowAccount
objectClass: sambaSamAccount
objectClass: person
gecos: I am a DSP Test
sambaLogonTime: 0
sambaPwdMustChange: 2147483647
sn: dsptest
sambaHomeDrive: H:
sambaSID: S-1-5-21-2258386664-3013221354-3332613826-21002
homeDirectory: /home/dsptest
displayName: dsptest
cn: dsptest
shadowLastChange: 17980
sambaPwdLastSet: 1553502597
sambaPrimaryGroupSID: S-1-5-21-2258386664-3013221354-3332613826-2026
gidNumber: 516
ou: teachers
shadowMax: 99999

and the dsp group:

# dsp, Groups, example.com
dn: cn=dsp,ou=Groups,dc=example,dc=com
objectClass: top
objectClass: posixGroup
objectClass: sambaGroupMapping
displayName: dsp
cn: dsp
sambaGroupType: 2
sambaSID: S-1-5-21-2258386664-3013221354-3332613826-2032
gidNumber: 516
memberUid: dsptest

Here the sanitized LDAP Server configuration:

The interesting parts is:
User Name Attribute: uid
Group Member Attribute: memberuid

When I go to login to the web portal the apache2 log shows:

[Mon Mar 25 14:12:41.159898 2019] [proxy_fcgi:error] [pid 11845] [client ::1:48370] AH01071: Got error 'PHP message: Plugin LDAP::_result(). Search Method: search; Filter: (&(|(name=dsp))(memberuid=uid=dsptest,ou=Users,dc=example,dc=com)); Result: 0\nPHP message: Plugin LDAP::_result(). Search Method: search; Filter: (&(|(name=))(memberuid=uid=dsptest,ou=Users,dc=example,dc=com)); Result: 0\nPHP message: Plugin LDAP::authLDAP() Access level is still 0 or false. No access is allowed!\n', referer: http://localhost/fog/management/index.php

The interesting parts is:
memberuid=uid=dsptest

I tried to use the proposed filter for a ldapsearch query and I am getting errors.

Could anyone please be of assistance?

Thank you,
Antonio

Sebastian Roth · Mar 25, 2019, 8:26 PM

@Fernando-Gietz knows the LDAP plugin best!

Fernando Gietz · Mar 26, 2019, 3:17 PM

I knew the plugin XD but @Tom-Elliott and @george1421 made a lot of changes to give support to active directory.

The connection to the openLDAP server works fine but the problem is when the script try to know if the user belong to the admin group.

Well, I am seeing the code and the problem is that the value of $accessLevel variable is 0. The possible values of this variable is:

     * Sets our default accessLevel to 0.
     * 0 = fail
     * 1 = mobile
     * 2 = admin

If dsp user is in the admin group then the script returns 2.

This variable changes his value when the code calls to _getAccessLevel($grpMemAttr, $userDN) function, I can suppose that the values of $grpMemAttr and $userDN are:
$grpMemAttr = memberuid
$userDN = uid=dsptest,ou=Users,dc=example,dc=com

With this, the code returns 0 result because the user is not in the admin group or not find nothing with the filter:

(&(|(name=dsp))(memberuid=uid=dsptest,ou=Users,dc=example,dc=com)); Result: 0

As you don’t have setup the mobile group the next filter:
(&(|(name=))(memberuid=uid=dsptest,ou=Users,dc=example,dc=com)); Result: 0
Then the code returns $accessLevel = 0. if the user is not in the admin group or in the mobile group then the user don’t have access.

Fernando Gietz · Mar 26, 2019, 3:21 PM

You can see the code in /var/www/[html/]fog/lib/plugin/ldap/class/ldap.class.php
functions: authLDAP() and _getAccessLevel()

george1421 · Mar 26, 2019, 3:54 PM

@Fernando-Gietz said in LDAP Plugin with openLDAP:

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

The issue is with this bit of the query syntax.

We are doing an or between ‘(name=dsp)’ ad ‘)’ There is a missing parameter the other part of the or test or there is an extra ‘)’ in that syntax. I really need to count opening and closing parentheses here, but my gut feeling is its wrong. As well as the ‘memberuid=uid=dsptest’ test. I haven’t had time to see what changed in the ldap auth module but I’m a bit surprised that it authenticates AD since AD is really picky on the query syntax.

I’m pretty sure when Tom was debugging my code he was testing against an OpenLDAP server in his dev environment.

antonionardella · Mar 26, 2019, 4:28 PM

@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 · Mar 26, 2019, 4:31 PM

@george1421 said in LDAP Plugin with openLDAP:

@Fernando-Gietz said in LDAP Plugin with openLDAP:

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

The issue is with this bit of the query syntax.

We are doing an or between ‘(name=dsp)’ ad ‘)’ There is a missing parameter the other part of the or test or there is an extra ‘)’ in that syntax. I really need to count opening and closing parentheses here, but my gut feeling is its wrong. As well as the ‘memberuid=uid=dsptest’ test. I haven’t had time to see what changed in the ldap auth module but I’m a bit surprised that it authenticates AD since AD is really picky on the query syntax.

The second parentesis is necessary because the the sintax has a logical operator “|” (|(name=dsp).

I don’t have openLDAP, I use AD but my filter is:
(&(|(name=aux.caunivel21))(member=CN=bczxxxx,OU=people,DC=xxxx,DC=xxx,DC=xx))

And works fine

antonionardella · Mar 26, 2019, 4:34 PM

As soon as I add anything to the filter I get no answer:

Fernando Gietz · Mar 26, 2019, 5:01 PM

And if you change the filter with:

(&(|(name=dsp))(memberuid=dsptest,ou=Groups,dc=XXXXXX,dc=XXXXX));

george1421 · Mar 26, 2019, 5:45 PM

@Fernando-Gietz I’m still a bit baffled on how this query is constructed.

For example here is a query syntax I borrowed off the internet.
(&(employmentType=*)(!(employmentType=Hired))(!(employmentType=NEW))(!(employmentType=POS))(!(employmentType=REH)))
I can understand and read this just fine.

This one is still giving me pains.

(&(|(name=dsp))(memberuid=dsptest,ou=Groups,dc=XXXXXX,dc=XXXXX));

If I’m reading this right you are anding these two search results.

(& (|(name=dsp)) <and> (memberuid=dsptest,ou=Groups,dc=XXXXXX,dc=XXXXX) );

What is bugging me is this part
(|(name=dsp))

That floating or in there with nothing to or to. I might expect it to look like this
(|(name=dsp)(name=bob)) then <and> it with (memberuid=dsptest,ou=Groups,dc=XXXXXX,dc=XXXXX)

Or drop the or so you were just anding (name=dsp) <and> (memberuid=dsptest)

I may be totally confused here but that is how I’m reading the search criteria. BUT also it may not be the problem the OP’s having.

george1421 · Mar 26, 2019, 5:56 PM

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

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.
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 · Mar 26, 2019, 6:10 PM

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 · Mar 27, 2019, 7:20 AM

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

Thanks,
Antonio

antonionardella · Mar 29, 2019, 4:14 PM

@Fernando-Gietz here the result:

Fernando Gietz · Mar 29, 2019, 4:26 PM

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 · Mar 29, 2019, 4:42 PM

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 · Mar 29, 2019, 5:06 PM

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 · Apr 2, 2019, 11:21 AM

Hello @Fernando-Gietz it works using that code!

Fernando Gietz · Apr 2, 2019, 4:42 PM

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 · Apr 5, 2019, 8:52 AM

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

LDAP Plugin with openLDAP

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