[Samba] User invalid SID with home directory - Bueller?
Wes Modes
wmodes at ucsc.edu
Thu May 15 19:12:14 GMT 2008
The [homes] share is configured similarly to the [home] share, though
one would mount it different:
\\fileserver.ucsc.edu\home for the [home] share
\\fileserver.ucsc.edu\wmodes for the [homes] share
and for users who have the problem, they have the SID problem in
mounting both shares.
On my server, even for those accounts that work fine, there is little
similarity in the SID for the domain and the user's SambaSID, and the
SambaPrimaryGroupSID.
I am beginning to suspect, I reset the machine SID after I created many
of my accounts. And so the old SID somewhere somehow encoded within the
user's old SambaSID turns up as invalid.
If anybody knows how to specify that I can trust these accounts so I
don't have the SID problem, that'd be swell.
W.
Charlie wrote:
> The first part of any SID is the domain portion. It should be pretty
> constant throughout your domain as I understand things. When dealing
> with users and groups, the bit after the last dash is the RID or
> relative ID and it must be unique within the domain. Really really
> unique! If samba created your user & group sids the groups will be
> odd-numbered and users will be even-numbered.
>
> So, for example, the domain SID for my domain looks somewhat like this:
>
> SID for domain DARKAGES is: S-1-5-21-267844371-1268535915-2638854549
>
> And the SID for my PDC and BDCs are exactly the same, although other
> servers (that are not either PDCs or BDCs) have their own unique SIDs.
>
> My personal SID looks like this: S-1-5-21-267844371-1268535915-2638854549-1802
>
> Notice my RID of 1802 on the end there? I have a uidNumber of 401 on
> the POSIX side. The beginning bit seems to define my domain
> membership, though.
>
> If I change the domain SID on my PDC with "net setlocalsid" I can no
> longer log in using my own account, apparently because I do not have
> the right SID. There are ways to get around that involving winbind
> and/or domain trust accounts - but I can't explain those things
> because I don't understand them either. My knowledge of CIFS and
> samba is pretty shallow.
>
> We may be off in the weeds here, though - you should check out samba's
> automagical [homes] share and see if you can make it do what you want
> without having to do the %U thing.
>
> --Charlie
>
> On Wed, May 14, 2008 at 6:23 PM, Wes Modes <wmodes at ucsc.edu> wrote:
>
>> It does not. But then the SID of each user doesn't match those of each other
>> either. I've seen that asked before, but are you sure the machine's SID and
>> every user SID should be the same?
>>
>> W.
>>
>> Charlie wrote:
>>
>> If you do a "net getlocalsid" at your shell prompt on the samba server
>> that hosts the share, does the preamble of the SID returned match that
>> of the SID you see in your error messages?
>>
>> I'm betting not...
>>
>> --Charlie
>>
>> On Tue, May 13, 2008 at 2:39 PM, Wes Modes <wmodes at ucsc.edu> wrote:
>>
>>
>> So even though I see this popping up in tons of posts, no one has
>> encountered it and successfully solved the problem or can illuminate the
>> issue?
>>
>> Here's what I did not knowing what else to do:
>>
>> 1. Deleted the account. (smbldap-userdel)
>> 2. Recreated the account (smbldap-useradd)
>> 3. Searched for any files owned by the old user, and chown'd them to
>> the new user
>>
>> It is not an elegant solution, but it is the only one I have now. So far I
>> haven't gotten any accounts that have had the problem reoccur. But I'm
>> waiting to see.
>>
>> Wes
>>
>>
>> Wes Modes wrote:
>>
>>
>>
>> I'm having the problem in which users can access their group shares, but
>>
>>
>> not their home shares. These two shares are defined thusly in smb.conf:
>>
>>
>> [seref]
>> comment = Science & Engineering Reference Section
>> path = /data/group/seref
>> valid users = @seref, @seref-read, @admin
>> read list = @seref-read
>> write list = @seref, @admin
>> force group = seref
>> create mask = 0664
>> directory mask = 0770
>>
>> [home]
>> comment = %u's Personal Share Directory
>> path = /data/home/%U
>> valid users = %U, @admin
>> write list = %U, @admin
>> create mask = 0600
>> directory mask = 0700
>> browseable = No
>>
>>
>> It seems that the %U variable, causes Samba to do a lookup_global_sam_name
>>
>>
>> which fails.
>>
>>
>> [root at fileserver]# smbclient -Ujoeblow
>> '\\edgar.library.ucsc.edu\home' xxxxxxxx
>> tree connect failed: NT_STATUS_ACCESS_DENIED
>>
>>
>> Here's the relevant section of the log:
>>
>> passdb/pdb_ldap.c:init_sam_from_ldap(545)
>> init_sam_from_ldap: Entry found for user: joeblow
>> passdb/pdb_ldap.c:init_group_from_ldap(2158)
>> init_group_from_ldap: Entry found for group: 30023
>> passdb/passdb.c:lookup_global_sam_name(596)
>> User joeblow with invalid SID
>> S-1-5-21-2642364908-3785178431-1037763545-61756 in passdb
>> passdb/pdb_ldap.c:init_group_from_ldap(2158)
>> init_group_from_ldap: Entry found for group: 1001
>> smbd/service.c:make_connection_snum(616)
>> user 'joeblow' (from session setup) not permitted to access this
>> share (home)
>>
>>
>> Please note that I am not using the ADS security model, nor do I care to
>>
>>
>> at the moment. Here's the significant part of my smb.conf:
>>
>>
>> ### Basic information for server
>> workgroup = MCHSTAFF
>> netbios name = EDGAR
>> server string = Library Samba Server
>> hosts allow = 169.233.
>> hosts allow = 128.114.
>> enable privileges = yes
>> security = user
>> encrypt passwords = yes
>> preferred master = yes
>> domain master = yes
>> domain logons = yes
>> local master = yes
>> username map = /etc/samba/smbusers
>> logon path =
>> wins support = yes
>> dns proxy = no
>>
>> So why I am I getting the failure "User joeblow with invalid SID"?
>>
>> Wes
>>
>>
>>
>>
>>
>> --
>>
>> Wes Modes
>> Server Administrator & Programmer Analyst
>> McHenry Library
>> Computing & Network Services
>> Information and Technology Services
>> 459-5208
>> --
>> To unsubscribe from this list go to the following URL and read the
>> instructions: https://lists.samba.org/mailman/listinfo/samba
>>
>>
>>
>> --
>>
>> Wes Modes
>> Server Administrator & Programmer Analyst
>> McHenry Library
>> Computing & Network Services
>> Information and Technology Services
>> 459-5208
>>
--
Wes Modes
Server Administrator & Programmer Analyst
McHenry Library
Computing & Network Services
Information and Technology Services
459-5208
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