topic getpwnam_r returns null though the user present in Active Directory and it returns in Operating System - Linux

getpwnam_r returns null though the user present in Active Directory and it returns

Babula — Wed, 01 Jul 2020 12:50:10 GMT

Hi All,

I find getpwnam_r returns null, though the user avaialbe in Active Directory and also I find in wireshark Active Directory has returned user detail as a response to ldap search made by getpwnam_r. It would be really helpful if I get to now what is going wrong there.

I am using nss-ldap and pam-ldap modules for authenticaiton.

When I tried getent passwd ldapuser this also does not return the user.

Re: getpwnam_r returns null though the user present in Active Directory and it returns

avd437 — Mon, 20 Jul 2020 08:15:07 GMT

Not sure which linux version you are using, might be this article helpful...

https://bugzilla.redhat.com/show_bug.cgi?id=988068

Re: getpwnam_r returns null though the user present in Active Directory and it returns

Babula — Wed, 22 Jul 2020 05:21:03 GMT

Thanks for your reply. The bugzilla reference you have provided thats related to user does not exist in LDAP Store. But mine is littel bit different. I could find the user is present in Active Directory and also using strace I found getpwnam_r reads the user attributes and also confirmed using wireshark when LDAP server responded back with required attributes for that user to getpwnam_r ldap search request. But getpwnam_r returns NULL and error was set to 0.

So it would be great help if I get to known what all being checked by getpwnam_r after receiving data and when does it return NULL and error 0.

By the way I am using glibc-2.30 . I wrote a small test program using getpwnam_r there also I find the same behaviour.