Bug 2211617

Summary:	[RHEL9] samba 4.18 regression. WERR_NERR_DFSNOSUCHSERVER with dfsgetinfo
Product:	Red Hat Enterprise Linux 9	Reporter:	Denis Karpelevich <dkarpele>
Component:	samba	Assignee:	Pavel Filipensky <pfilipen>
Status:	ON_QA ---	QA Contact:	Denis Karpelevich <dkarpele>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	9.3	CC:	aboscatt, asn, dkarpele, pfilipen
Target Milestone:	rc	Keywords:	Triaged
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	sync-to-jira
Fixed In Version:	samba-4.18.6-100.el9	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	2232564 (view as bug list)		Environment:
Last Closed:		Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2232564

Description Denis Karpelevich 2023-06-01 08:55:24 UTC

Description of problem:
dfsgetinfo reports WERR_NERR_DFSNOSUCHSERVER in Permissive mode and
NT_STATUS_CONNECTION_DISCONNECTED in Enforcing mode. 
http://pastebin.test.redhat.com/1051880
http://file.emea.redhat.com/~dkarpele/log_dfsgetinfo/

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
The order of the commands is:
0) created dir on Windows (win-share-coredump-with)
1) Join the Ad domain and start smb & winbind
2) ln -s msdfs:AD-SAMBA-R87\win-share-coredump-with pointA
3) smbclient //localhost/samba-share/pointA -U Administrator%Secret123 -c showconnect'
//AD-SAMBA-R87/win-share-coredump-with

4) rpcclient localhost -U% -c 'dfsgetinfo \\localhost\samba-share\pointA localhost pointA''do_cmd: Could not initialise netdfs. Error was NT_STATUS_CONNECTION_DISCONNECTED

5) setenforce 0
6) rpcclient localhost -U% -c 'dfsgetinfo \\localhost\samba-share\pointA localhost pointA''
result was WERR_NERR_DFSNOSUCHSERVER

Actual results:
result was WERR_NERR_DFSNOSUCHSERVER

Expected results:


Additional info:

https://idm-artifacts.psi.redhat.com/idm-ci/samba/Test-compose/RHEL9.3/2023-05-23_16-14/tier-2/tier2_ws2019/1/tier2-restraint.01/recipes/1/tasks/32/logs/taskout.log 
Originally found on samba-4.16, now I reproduce it on samba-4.18. Test works fine with samba-4.17

Comment 1 Pavel Filipensky 2023-06-12 09:33:40 UTC

The reason is in a new samba code in samba-4.18. rpcclient dfsgetinfo no longer supports double backslash in path:


rpcclient localhost -U% -c 'dfsgetinfo \\localhost\samba-share\pointA localhost pointA''

and works only with a single backslash.

rpcclient localhost -U% -c 'dfsgetinfo \localhost\samba-share\pointA localhost pointA''

Mail to upstream was sent to samba-technical list to clarify the change.

Comment 2 Pavel Filipensky 2023-08-03 07:50:58 UTC

The fix is part of samba-4.18.6 which will be released in the middle of August. Rhel 8.9/9.3 will be then rebased to it.