Re: [EXT] Re: Problems to use LDAP again AD directory with disabledanonymous logon - Mailing list pgadmin-support

Created feature request for this issue https://redmine.postgresql.org/issues/5484 with details proposal how to enhance it

Hope someone will grab the request as LDAP support is a really long awaited feature and the request would complete the LDAP implementation.

Unfortunately I have no Python skill .. otherwise I would have pushed a PR __
cheers
Heiko

From: Khushboo Vashi <khushboo.vashi@enterprisedb.com>
Date: Wednesday, 6. May 2020 at 10:50
To: "Onnebrink, Heiko" <heiko.onnebrink@metronom.com>
Cc: pgAdmin Support <pgadmin-support@postgresql.org>
Subject: Re: [EXT] Re: Problems to use LDAP again AD directory with disabled anonymous logon

Hi,

[Adding pgAdmin Support...]

On Wed, May 6, 2020 at 11:43 AM <mailto:heiko.onnebrink@metronom.com> wrote:
Hi
hope it is ok to contact you via PM.
First all thanks for the feedback on the pgAdmin mailing list ..

I still do not understand the LDAP config properly.
Maybe I should have also described more precise our LDAP scenario, therefore some more input

We have users in different locations that want to work with pgAdmin
Here 2 sample users that want to logon to pgAdmin:

User A DN: CN=Onnebrink
Heiko,OU=HQ01-DUS,OU=Users,OU=DE,OU=MSYS,DC=r2,DC=madm,DC=net
will logon with his UPN mailto:heiko.onnebrink@metronom.com

User B DN:
 CN=Other User,OU=BRANCH-BUK,OU=Users,OU=RO,OU=MSYS,DC=r3,DC=madm,DC=net
will logon with his UPN mailto:other.user@metrosystems.ro

They will enter there UPN heiko.onnebrink@metronom.ccom or mailto:other.user@metrosystems.ro in logon screen as username

As our LDAP does not allow anonymous access we have a technical user SVCLDAP that can be used to connect to global catalog
DN: (cn=SVCLDAP, cn=Users, dc=asf, dc=madm, dc=net) with some fixed password "secret" that we could configure somewhere if required.

Can this be configured for pgAdmin ldap integration?


If not I have a proposal that I implemented several times for different apps.

define some parameter like LDAP_BIND_USER and LDAP_BIND_PWD that takes the credentials of a technical user that can be used to connect to the catalog
If LDAP_BIND_USER and LDAP_BIND_PWD are set do the following:
bind to the catalog using LDAP_BIND_USER / LDAP_BIND_PWD, in our case dn=(cn=SVCLDAP, cn=Users, dc=asf, dc=madm, dc=net) and password "secret"
start a search for the entered username from login screen, e.g. mailto:heiko.onnebrink@metronom.com using the existing base and filter vars .. in our case a search would start from (dc=madm, dc=net) and search for userPrincipalName=mailto:heiko.onnebrink@metronom.com 
this search should return us the DN of the user
If the DN of the user could be retrieved make a bind using the found DN and the entered password from logon screen
If success user auth is done.

Currently pgAdmin does not support this kind of configuration but looks like a valid proposal, so I would suggest to log the feature request @ https://redmine.postgresql.org/projects/pgadmin4

Right now, users can login with the DN itself. For example, 
cn=user1,ou=users,dc=example,dc=com
cn=user2,ou=users,dc=example,dc=com
So, here BASE_DN would be ou=users,dc=example,dc=com and USERNAME_ATTRIBUTE would be cn. So, the user can login with user1 (input for the username field) and password. 

Thanks,
Khushboo
Thanks for your feedback
Cheers
Heiko


From: Khushboo Vashi <mailto:khushboo.vashi@enterprisedb.com>
Date: Wednesday, 6. May 2020 at 06:42
To: "Onnebrink, Heiko" <mailto:heiko.onnebrink@metronom.com>
Cc: "pgadmin-support http://lists.postgresql.org" <mailto:pgadmin-support@lists.postgresql.org>
Subject: [EXT] Re: Problems to use LDAP again AD directory with disabled anonymous logon

Hi,

On Wed, May 6, 2020 at 12:57 AM <mailto:mailto:heiko.onnebrink@metronom.com> wrote:
Hi
I am exited to see that with the latest patch we have LDAP support in pgAdmin
I tried to make it work but did not succeed.

We use Microsoft AD. We have a global catalog that allows LDAP access but anonymous access is disabled.

I have a technical user SVCLDAP that I can use to auth against LDAP and search for a user via UPN and did some ldapsearch tests before I changed the config of pgAdmin:

ldapsearch -H ldap://http://ldap.mgi.de:389 -D "CN=SVCLDAP, CN=Users, DC=ASF, DC=madm, DC=net" -W  -b "dc=R2, dc=madm,dc=net" "(userPrincipalName=mailto:mailto:heiko.onnebrink@metronom.com)"
Enter LDAP Password: somepwd

# extended LDIF
#
# LDAPv3
# base <dc=madm,dc=net> with scope subtree
# filter: (userPrincipalName=mailto:mailto:heiko.onnebrink@metronom.com)
# requesting: ALL
#

# Onnebrink Heiko, HQ01-DUS, Users, DE, MSYS, http://r2.madm.net
dn: CN=Onnebrink Heiko,OU=HQ01-DUS,OU=Users,OU=DE,OU=MSYS,DC=r2,DC=madm,DC=net
..

If I do the same query without providing a bind DN gives an sasl error

ldapsearch -H ldap://http://ldap.mgi.de:389 -b "dc=R2, dc=madm,dc=net" "(userPrincipalName=mailto:mailto:heiko.onnebrink@metronom.com)"


SASL/GSSAPI authentication started
ldap_sasl_interactive_bind_s: Local error (-2)
additional info: SASL(-1): generic failure: GSSAPI Error: Unspecified GSS failure.  Minor code may provide more information (No Kerberos credentials available (default cache: FILE:/tmp/krb5cc_500))


If I disable SASL (-x) it works but returns no data:

ldapsearch -H ldap://http://ldap.mgi.de:389 -x  -b "dc=R2, dc=madm,dc=net" "(userPrincipalName=mailto:mailto:heiko.onnebrink@metronom.com)"
# extended LDIF
#
# LDAPv3
# base <dc=R2, dc=madm,dc=net> with scope subtree
# filter: (userPrincipalName=mailto:mailto:heiko.onnebrink@metronom.com)
# requesting: ALL
#

# search result
search: 2
result: 0 Success

# numResponses: 1

I transferred now the above settings to the pgAdmin config (docker is used here)

docker run -p 443:443 --name pgadminssl -e 'PGADMIN_CONFIG_LDAP_SERVER_URI="ldap://http://ldap.mgi.de:389"'  -e 'PGADMIN_CONFIG_LDAP_USERNAME_ATTRIBUTE="userPrincipalName"' -e 'PGADMIN_CONFIG_LDAP_BASE_DN="(dc=madm,dc=net)"' -e 'PGADMIN_CONFIG_SEARCH_SCOPE="SUBTREE"' -e
'PGADMIN_CONFIG_AUTHENTICATION_SOURCES="ldap","internal"' -v '/dockerdata/pgadmin/servers.json:/servers.json' -v '/dockerdata/pgadmin/server.cert:/certs/server.cert' -v '/dockerdata/pgadmin/server.key:/certs/server.key' -e PGADMIN_ENABLE_TLS=TRUE -e
PGADMIN_DEFAULT_PASSWORD=admin -e
PGADMIN_DEFAULT_EMAIL=mailto:mailto:admin@metronom.com http://registry.metroscales.io/rdb-dev/pgadmin:latest

As per your ldapsearch (ldapsearch -H ldap://http://ldap.mgi.de:389 -D "CN=SVCLDAP, CN=Users, DC=ASF, DC=madm, DC=net" -W  -b "dc=R2, dc=madm,dc=net" "(userPrincipalName=mailto:mailto:heiko.onnebrink@metronom.com)"), the pgAdmin LDAP parameters should be configured as below.

PGADMIN_CONFIG_AUTHENTICATION_SOURCES=["ldap", "internal"]
PGADMIN_CONFIG_LDAP_SERVER_URI="ldap://http://ldap.mgi.de:389"
PGADMIN_CONFIG_LDAP_BASE_DN="CN=Users, DC=ASF, DC=madm, DC=net"
PGADMIN_CONFIG_LDAP_USERNAME_ATTRIBUTE="CN"
PGADMIN_CONFIG_SEARCH_SCOPE="SUBTREE"
PGADMIN_CONFIG_LDAP_SEARCH_BASE_DN="dc=R2, dc=madm,dc=net"
PGADMIN_CONFIG_LDAP_SEARCH_FILTER="(userPrincipalName=mailto:mailto:heiko.onnebrink@metronom.com)"

The LDAP configuration details can be found at https://www.pgadmin.org/docs/pgadmin4/4.21/enabling_ldap_authentication.html

When you try to login to the pgAdmin application, SVCLDAP should be given in the username input box.
Ref: https://www.pgadmin.org/docs/pgadmin4/4.21/login.html
 
2020-05-05 10:27:46,936: ERROR
flask.app: Error binding to the LDAP server.
Traceback (most recent call last):
  File "/pgadmin4/pgadmin/authenticate/ldap.py", line 115, in connect
    auto_bind=True
  File "/usr/local/lib/python3.7/site-packages/ldap3/core/connection.py", line 355, in __init__
    self.do_auto_bind()
  File "/usr/local/lib/python3.7/site-packages/ldap3/core/connection.py", line 384, in do_auto_bind
    raise LDAPBindError(self.last_error)
ldap3.core.exceptions.LDAPBindError: None

From config description I do not see how I pass a bind user that would required (as we do not allow anonymous access) so that an LDAP query can be executed that finds the logon user via his UPN. Once record is found we have the DN that can be used to bind the user with his entered password to verify that password is valid.
pgAdmin will first bind the LDAP server with the given configurations, then filter out user based on the LDAP_SEARCH_BASE_DN and LDAP_SEARCH_FILTER configurations.

Thanks,
Khushboo
Thanks for sharing how it works internally and what mistake I have here in my config..

cheers
Heiko

Geschäftsanschrift/Business address: METRO-NOM GmbH, Metro-Straße 12, 40235 Duesseldorf, Germany
Aufsichtsrat/Supervisory Board: Olaf Koch (Vorsitzender/Chairman)
Geschäftsführung/Management Board: Timo Salzsieder (Vorsitzender/CEO), Felix Lindemann (COO), Frank Hammerle (CFO)
Sitz Düsseldorf, Amtsgericht Düsseldorf, HRB 18232/Registered Office Düsseldorf, Commercial Register of the Düsseldorf Local Court, HRB 18232

Betreffend Mails von *@http://metronom.com <http://metrosystems.net/>
Die in dieser E-Mail enthaltenen Nachrichten und Anhänge sind ausschließlich für den bezeichneten Adressaten bestimmt. Sie können rechtlich geschützte, vertrauliche Informationen enthalten. Falls Sie nicht der bezeichnete Empfänger oder zum Empfang dieser E-Mail nicht berechtigt sind, ist die Verwendung, Vervielfältigung oder Weitergabe der Nachrichten und Anhänge untersagt. Falls Sie diese E-Mail irrtümlich erhalten haben, informieren Sie bitte unverzüglich den Absender und vernichten Sie die E-Mail.

Regarding mails from *@http://metronom.com <http://metrosystems.net/>
This e-mail message and any attachment are intended exclusively for the named addressee. They may contain confidential information which may also be protected by professional secrecy. Unless you are the named addressee (or authorised to receive for the addressee) you may not copy or use this message or any attachment or disclose the contents to anyone else. If this e-mail was

Geschäftsanschrift/Business address: METRO-NOM GmbH, Metro-Straße 12, 40235 Duesseldorf, Germany
Aufsichtsrat/Supervisory Board: Olaf Koch (Vorsitzender/Chairman)
Geschäftsführung/Management Board: Timo Salzsieder (Vorsitzender/CEO), Felix Lindemann (COO), Frank Hammerle (CFO)
Sitz Düsseldorf, Amtsgericht Düsseldorf, HRB 18232/Registered Office Düsseldorf, Commercial Register of the Düsseldorf Local Court, HRB 18232

Betreffend Mails von *@http://metronom.com <http://metrosystems.net/>
Die in dieser E-Mail enthaltenen Nachrichten und Anhänge sind ausschließlich für den bezeichneten Adressaten bestimmt. Sie können rechtlich geschützte, vertrauliche Informationen enthalten. Falls Sie nicht der bezeichnete Empfänger oder zum Empfang dieser E-Mail nicht berechtigt sind, ist die Verwendung, Vervielfältigung oder Weitergabe der Nachrichten und Anhänge untersagt. Falls Sie diese E-Mail irrtümlich erhalten haben, informieren Sie bitte unverzüglich den Absender und vernichten Sie die E-Mail.

Regarding mails from *@http://metronom.com <http://metrosystems.net/>
This e-mail message and any attachment are intended exclusively for the named addressee. They may contain confidential information which may also be protected by professional secrecy. Unless you are the named addressee (or authorised to receive for the addressee) you may not copy or use this message or any attachment or disclose the contents to anyone else. If this e-mail was

Geschäftsanschrift/Business address: METRO-NOM GmbH, Metro-Straße 12, 40235 Duesseldorf, Germany
Aufsichtsrat/Supervisory Board: Olaf Koch (Vorsitzender/Chairman)
Geschäftsführung/Management Board: Timo Salzsieder (Vorsitzender/CEO), Felix Lindemann (COO), Frank Hammerle (CFO)
Sitz Düsseldorf, Amtsgericht Düsseldorf, HRB 18232/Registered Office Düsseldorf, Commercial Register of the Düsseldorf Local Court, HRB 18232

Betreffend Mails von *@metronom.com <http://metrosystems.net/>
Die in dieser E-Mail enthaltenen Nachrichten und Anhänge sind ausschließlich für den bezeichneten Adressaten bestimmt. Sie können rechtlich geschützte, vertrauliche Informationen enthalten. Falls Sie nicht der bezeichnete Empfänger oder zum Empfang dieser E-Mail nicht berechtigt sind, ist die Verwendung, Vervielfältigung oder Weitergabe der Nachrichten und Anhänge untersagt. Falls Sie diese E-Mail irrtümlich erhalten haben, informieren Sie bitte unverzüglich den Absender und vernichten Sie die E-Mail.

Regarding mails from *@metronom.com <http://metrosystems.net/>
This e-mail message and any attachment are intended exclusively for the named addressee. They may contain confidential information which may also be protected by professional secrecy. Unless you are the named addressee (or authorised to receive for the addressee) you may not copy or use this message or any attachment or disclose the contents to anyone else. If this e-mail was