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Cloned from upstream: https://pagure.io/freeipa/issue/6827

While investigating issue 6660, samba logs were showing:

    [2017/03/28 17:02:35.471728,  0] ../source3/passdb/lookup_sid.c:1605(get_primary_group_sid)
      Failed to find a Unix account for DOM-AD$

This happens in calls to ldapsam_getsampwnam(), which eventually calls get_primary_group_sid() for the trusted domain entry. As the entry does not contain any gidNumber, the call fails.
The gidNumber attribute should be added when the trusted domain entry is created.

Upstream ticket:
https://pagure.io/freeipa/issue/6827

Fixed upstream
master:
https://pagure.io/freeipa/c/e052c2dce04f5ce147dc2b6804f44705fa4d69df
https://pagure.io/freeipa/c/5405de5bc15941d71137af10aa66a6cf922d9e6d
ipa-4-5:
https://pagure.io/freeipa/c/91d36941653476abfff6a54ba7cb5a9f2c12c22d
https://pagure.io/freeipa/c/eddd29f1d52d63ea702437b0dd2a2826df52bc26

Verified
ipa-server-4.5.0-13.el7.x86_64

Trusted domain entry contain a gidNumber attribute

# ldapsearch -Y GSSAPI -Q -LLL -b "cn=Default SMB Group,cn=groups,cn=accounts,$BASEDN" gidNumber

dn: cn=Default SMB Group,cn=groups,cn=accounts,dc=sudoexsm33,dc=test
gidNumber: 1986800001


# ldapsearch -Y GSSAPI -Q -LLL -b cn=$ADDOMAIN,cn=ad,cn=trusts,$BASEDN -s base gidNumber

dn: cn=pne.qe,cn=ad,cn=trusts,dc=sudoexsm33,dc=test
gidNumber: 1986800001

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2304