Why does sudo not work with IdM if default_domain_suffix is set in Red Hat (IPA) Identity Management

Solution Verified - Updated -

Issue

  • Client is part of IdM domain that has a trust to Active Directory.
  • Sudo rule is set up for a user group that contains an external user group which contains users from AD.
  • On the host SSSD is configured with default_domain_suffix set to the AD domain. 
[testuser@ad.example.com@ipaclient ~]$ sudo -l
[sudo] password for testuser@ad.example.com:
Sorry, user testuser@ad.example.com may not run sudo on ipaclient.

With default_domain_suffix unset, sudo works as expected:
  • With the default_domain_suffix option removed, sudo works as expected

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6

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