I'm trying to set up samba (standalone) following these instructions:
https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-mapping-samba
but I'm having no luck getting my samba user/groups to appear correctly using
the <cygwin unix="601"/> comment field as described in the document.
I'm using samba 4.13.14 on Ubuntu 20.04 with security = user (smbpasswd).
winbindd is not installed and I'm not using any LDAP or AD anywhere.
E.g. here is what is on the server (croehrig:croehrig = 601:601;
cristina:cristina = 603:603)
housesrv[3]% ls -l /House/Users
total 17
drwxr-xr-x 9 cristina cristina 22 Jan 12 16:06 cristina
drwxr-xr-x 30 croehrig croehrig 53 Jan 13 09:47 croehrig
Here are the ACLs and SIDs when looking on the windows client:
tyto[5]% icacls \\\\housesrv\\Users\\\*
\\housesrv\Users\cristina S-1-5-21-751087815-2087572193-42305691-1001:(F)
S-1-22-2-603:(RX)
Everyone:(RX)
\\housesrv\Users\croehrig S-1-5-21-751087815-2087572193-42305691-1000:(F)
S-1-22-2-601:(RX)
Everyone:(RX)
As you can see, the gid is mapping to the S-1-22-2-<gid> as described in the
document above, but
the uid is using a domain-specific SID with different RIDs.
On the windows client I have the same users and groups set up locally (SAM)
with appropriate SID mappings to the same uid/gids (601/603) in the Cygwin
/etc/passwd and /etc/group. This has all been working well to ensure e.g.
rsync preserves permissions and ownership between cygwin and Linux. (The
windows groups are called 'grp-croehrig' and 'grp-cristina' since windows users
and groups share a namespace, but they are mapped to 'croehrig' and 'cristina'
in /etc/group).
Here is how the SMB share looks under Cygwin:
tyto[6]% ls -l //housesrv/Users/
total 0
drwxr-xr-x 1 Unknown+User Unix_Group+603 0 Jan 12 16:06 cristina
drwxr-xr-x 1 Unknown+User Unix_Group+601 0 Jan 13 09:47 croehrig
tyto[7]% ls -ln //housesrv/Users/
total 0
drwxr-xr-x 1 4294967295 4278190683 0 Jan 12 16:06 cristina
drwxr-xr-x 1 4294967295 4278190681 0 Jan 13 09:47 croehrig
I have added the SAM desc/comment field as described in the document above:
i.e.
net localgroup grp-croehrig /comment:'<cygwin unix="601"/>'
net user croehrig /comment:'<cygwin unix="601" group="grp-croehrig" />'
and restarted all Cygwin processes, but it doesn't seem to have any effect
('net user croehrig' shows the comment is indeed present). I guess I don't
understand how that comment field works.
Anyone have any advice?
Thanks,
-- Chris
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