Samba looking up hostnames in passwd NIS map??

[Robert Dahlem]

Jesse,

On Mon, 04 Dec 2000 15:45:04 -0500, Jesse Asher wrote:

>> >I've looked through the archives for this list and couldn't find
>> >mention of a strange behavior I'm seeing.

>> >I've got a Win98 system that is trying to map a share from my 
>> >Samba server running Solaris 7 and Samba 2.0.7.

>> >When I  map the network drive (the share is /tmp on the server),
>> >Samba does attempt to contact the NIS server (the nsswitch.conf 
>> >file has "hosts:  files nis"), but it  looks up the hostname of 
>> >the Win98 box i(jwasher-mobl) n the passwd NIS map!  As you can 
>> >see below, it makes various NIS calls and then finally queries my 
>> >real loginid (jwasher) and quits.

>> I bet your problem is "security = share".

>I have spent considerable amount of time reading the man page.  Since 
>my setting is actually "security = USER", I don't think this is the 
>problem.

A little snooping through the sources and a short test revealed this 
indeed seems to be independent from the security setting and I lost 
that bet.

In lib/system.c you will find sys_getpwnam() calling getpwnam(). This 
seems to be one triggering passwd lookups at the server in your NIS 
environment.

When a session setup packet arrives, the sequence is roughly like 
this:

    smbd/reply.c:reply_special()
        here the netbios name of the sender gets extracted
            (name2 goes to remote_machine)
    calls smbd/password.c:add_session_user(remote_machine)
    calls lib/username.c:Get_Pwnam(remote_machine, True)
        tries with various lower/upper cases of remote_machine
        when second argument == True
    calls lib/username.c:_Get_Pwnam()
    calls lib/system.c:sys_getpwnam()

Well, the question comes up why reply_special() tries to add the 
clients netbios name to the list of users in this session when not 
running with security = share? But that goes far beyond my knowledge 
of Samba. :-) You might try to ask on samba-technical.

Regards,
        Robert


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