Bug 14066 - Windows Client getting denied write access while logged as guest to samba share
Summary: Windows Client getting denied write access while logged as guest to samba share
Alias: None
Product: Samba 4.1 and newer
Classification: Unclassified
Component: File services (show other bugs)
Version: 4.9.1
Hardware: All Linux
: P5 normal (vote)
Target Milestone: ---
Assignee: Samba QA Contact
QA Contact: Samba QA Contact
Depends on:
Reported: 2019-08-02 14:15 UTC by Andrej Dzilský
Modified: 2021-07-29 12:58 UTC (History)
1 user (show)

See Also:

Log.smbd with NT_STATUS_ACCESS_DENIED (169.51 KB, text/plain)
2019-08-02 14:15 UTC, Andrej Dzilský
no flags Details

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Description Andrej Dzilský 2019-08-02 14:15:01 UTC
Created attachment 15371 [details]


since at least RHEL7.6, the windows user logged into samba share as a guest is not able get write access to create any file or directory for example.

Some additional information:

[root@%TESTING_VM% samba]# testparm -s
rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
Load smb config files from /etc/samba/smb.conf
rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
Processing section "[homes]"
Processing section "[data]"
Loaded services file OK.
WARNING: The 'netbios name' is too long (max. 15 chars).


# Global parameters
	map to guest = Bad User
	security = USER
	server string = Samba Server Version %v
	workgroup = MYGROUP
	idmap config * : backend = tdb

	comment = Home Directories
	read only = No

	comment = Public share
	guest ok = Yes
	path = /data
	read only = No

[root@ci-vm-10-0-138-64 data]# ls -alRZ
drwxrwxrwx. nobody nobody unconfined_u:object_r:samba_share_t:s0 .
dr-xr-xr-x. root   root   system_u:object_r:root_t:s0      ..
drwxr-xr-x. nobody nobody unconfined_u:object_r:samba_share_t:s0 testdir

drwxr-xr-x. nobody nobody unconfined_u:object_r:samba_share_t:s0 .
drwxrwxrwx. nobody nobody unconfined_u:object_r:samba_share_t:s0 ..

In the entry share directory called "data" with directory permissions set to 775, guest account mapped to "nobody" is allowed to create files.

On the other hand, in inner directory called "testdir" with permissions set to 755, guest account is unable to create anything. If the permissions are set to 775 it works as expected.

I've tried this scenario from Window Server 2019 and from Windows 10 using File Explorer GUI.
Comment 1 Andrej Dzilský 2019-08-30 12:58:57 UTC
After reading https://lists.samba.org/archive/samba/2019-August/225498.html, I've tried to look at the permissions from windows client and nothing was set therefore denied access is reasonable here.

Is this a bug ? Or is there any way how to have this permissions set automatically ?
Comment 2 Björn Jacke 2021-07-29 12:58:29 UTC
this is more of a support request, we'can't handle this in bugizlla, please consult the samba mailing list or some other support option from https://www.samba.org/samba/support/