Re: winbind stop working

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We're also seeing similar symptoms with our Squid proxy's winbindd as well.

After an indeterminate amount of time (sometimes an hour, sometimes a day) the winbind process will lose the ability to resolve UID/GIDs to SIDS and authentication to the proxy will fail:

[2012/04/27 11:04:52.217243,  3] lib/util_sid.c:228(string_to_sid)
  string_to_sid: Sid @CBJ_NT+domain users does not start with 'S-'.


If we try doing a winbind -p we get a sucessful return however trying to lookup a SID from UID/GID fails.

We're on Debian 6.0.4 and Samba 2.3.5.6.


Has anyone else seen this issue? Any possible workarounds or patches?




Here's an the debugging output for a particular user:

[2012/04/27 11:04:52.217018,  3] smbd/process.c:1294(switch_message)
  switch message SMBtconX (pid 15651) conn 0x0
[2012/04/27 11:04:52.217041,  3] smbd/sec_ctx.c:310(set_sec_ctx)
  setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
[2012/04/27 11:04:52.217062,  5] auth/token_util.c:525(debug_nt_user_token)
  NT user token: (NULL)
[2012/04/27 11:04:52.217085,  5] auth/token_util.c:551(debug_unix_user_token)
  UNIX token of user 0
  Primary group is 0 and contains 0 supplementary groups
[2012/04/27 11:04:52.217132,  5] smbd/uid.c:369(change_to_root_user)
  change_to_root_user: now uid=(0,0) gid=(0,0)
[2012/04/27 11:04:52.217169,  4] smbd/reply.c:786(reply_tcon_and_X)
  Client requested device type [?????] for share [FTP]
[2012/04/27 11:04:52.217209,  5] smbd/service.c:1227(make_connection)
  making a connection to 'normal' service ftp
[2012/04/27 11:04:52.217243,  3] lib/util_sid.c:228(string_to_sid)
  string_to_sid: Sid @CBJ_NT+domain users does not start with 'S-'.
[2012/04/27 11:04:52.217268,  5] smbd/password.c:423(user_in_netgroup)
  Unable to get default yp domain, let's try without specifying it
[2012/04/27 11:04:52.217289,  5] smbd/password.c:430(user_in_netgroup)
  looking for user CBJ_NT+kevin_miller of domain (ANY) in netgroup CBJ_NT+domain users
[2012/04/27 11:04:52.217316,  5] smbd/password.c:453(user_in_netgroup)
  looking for user cbj_nt+kevin_miller of domain (ANY) in netgroup CBJ_NT+domain users
[2012/04/27 11:04:52.217342, 10] passdb/lookup_sid.c:69(lookup_name)
  lookup_name: CBJ_NT\domain users => CBJ_NT (domain), domain users (name)
[2012/04/27 11:04:52.217363, 10] passdb/lookup_sid.c:70(lookup_name)
  lookup_name: flags = 0x077
[2012/04/27 11:04:52.217841, 10] passdb/util_wellknown.c:152(lookup_wellknown_name)
  map_name_to_wellknown_sid: looking up domain users
[2012/04/27 11:04:52.217890,  3] smbd/sec_ctx.c:210(push_sec_ctx)
  push_sec_ctx(0, 0) : sec_ctx_stack_ndx = 1
[2012/04/27 11:04:52.217921,  3] smbd/uid.c:429(push_conn_ctx)
  push_conn_ctx(0) : conn_ctx_stack_ndx = 0
[2012/04/27 11:04:52.217945,  3] smbd/sec_ctx.c:310(set_sec_ctx)
  setting sec ctx (0, 0) - sec_ctx_stack_ndx = 1
[2012/04/27 11:04:52.217966,  5] auth/token_util.c:525(debug_nt_user_token)
  NT user token: (NULL)
[2012/04/27 11:04:52.217987,  5] auth/token_util.c:551(debug_unix_user_token)
  UNIX token of user 0
  Primary group is 0 and contains 0 supplementary groups
[2012/04/27 11:04:52.218079,  3] smbd/sec_ctx.c:418(pop_sec_ctx)
  pop_sec_ctx (0, 0) - sec_ctx_stack_ndx = 0
[2012/04/27 11:04:52.219317,  5] smbd/share_access.c:117(token_contains_name)
  lookup_name CBJ_NT+domain users failed
[2012/04/27 11:04:52.219365, 10] smbd/share_access.c:216(user_ok_token)
  User CBJ_NT+kevin_miller not in 'valid users'
[2012/04/27 11:04:52.219394,  2] smbd/service.c:598(create_connection_server_info)
  user 'CBJ_NT+kevin_miller' (from session setup) not permitted to access this share (ftp)
[2012/04/27 11:04:52.219420,  1] smbd/service.c:678(make_connection_snum)
  create_connection_server_info failed: NT_STATUS_ACCESS_DENIED
[2012/04/27 11:04:52.219452,  3] smbd/error.c:80(error_packet_set)
  error packet at smbd/reply.c(795) cmd=117 (SMBtconX) NT_STATUS_ACCESS_DENIED


Here's the debugging output from the winbindd-idmap.old log:

2012/04/27 10:58:37.616201, 10] winbindd/idmap_util.c:115(idmap_gid_to_sid)
  idmap_gid_to_sid: gid = [1004], domain = ''
[2012/04/27 10:58:37.616243, 10] lib/gencache.c:334(gencache_get_data_blob)
  Cache entry with key = IDMAP/GID2SID/1004 couldn't be found
[2012/04/27 10:58:37.616265, 10] winbindd/idmap.c:745(idmap_backends_unixid_to_sid)
  idmap_backend_unixid_to_sid: domain = '', xid = 1004 (type 2)
[2012/04/27 10:58:37.616331, 10] winbindd/idmap.c:475(idmap_find_domain)
  idmap_find_domain called for domain ''
[2012/04/27 10:58:37.616352,  5] winbindd/idmap_tdb.c:696(idmap_tdb_id_to_sid)
  Requested id (1004) out of range (10000 - 79999). Filtered!
[2012/04/27 10:58:37.616380, 10] lib/gencache.c:180(gencache_set_data_blob)
  Adding cache entry with key = IDMAP/UID2SID/1004 and timeout = Fri Apr 27 11:00:37 2012
   (120 seconds ahead)
[2012/04/27 10:58:37.616436, 10] winbindd/idmap_util.c:151(idmap_gid_to_sid)
  gid [1004] not mapped
[2012/04/27 10:58:37.616456,  1] ../librpc/ndr/ndr.c:251(ndr_print_function_debug)
       wbint_Gid2Sid: struct wbint_Gid2Sid
          out: struct wbint_Gid2Sid
              sid                      : *
                  sid                      : S-0-0
              result                   : NT_STATUS_NONE_MAPPED


-- 
Kevin Elliott
 
Network Specialist
City and Borough of Juneau, MIS
(907) 586 - 0905
 




> -----Original Message-----
> From: samba-bounces@xxxxxxxxxxxxxxx 
> [mailto:samba-bounces@xxxxxxxxxxxxxxx] On Behalf Of Daniele
> Sent: Sunday, April 29, 2012 11:50 PM
> To: samba@xxxxxxxxxxxxxxx
> Subject:  winbind stop working
> 
> Hi, I am trying to use squid proxy with validation on win 
> 2003 active directory to filter internet navigation and for 
> it I installed an ubuntu
> 10.04 server 64 bit with samba.
> My installation looks ok, the server is joined to the AD, 
> ntlm is able to validate user, wbinfo report corret 
> information and squid works good.
> The problem arise after some hours: winbind become not able 
> to resolv info for users and to retrieve info for groups, so 
> squid become not able to know id a user belong to a group 
> allowed to navigate and refuse connection.
> Restarting winbind solve the problem for some hours.
> wbinfo report no particular problem; just give back messages 
> like "could not get info for user xx" and also setting 
> debuglevel to various numbers reports (to me) no significant clues.
> I made a workaround scheduling a restart of winbind service 
> at every half hour and it works, but is not so elegant ...
> Do you have any suggestion to solve this problem?
> Thank you
> Daniele
> 
> samba/winbind version is 3.4.7
> squid is 2.7.STABLE7
> os is 2.6.32-41-server #88-Ubuntu x86_64 GNU/Linux
> 
> smb.conf:
> [global]
>      workgroup = CED
>      realm = CED.AOS
>      server string = Samba Server Version %v
>      security = ADS
>      password server = 172.18.10.24 172.18.10.23
>      name resolve order = lmhosts host bcast
>      ldap ssl = no
>      idmap uid = 15000-25000
>      idmap gid = 15000-25000
>      winbind separator = +
>      winbind enum users = Yes
>      winbind enum groups = Yes
>      winbind use default domain = Yes
>      cups options = raw
> [homes]
>      comment = Home Directories
>      read only = No
>      browseable = No
>      browsable = No
> 
> [printers]
>      comment = All Printers
>      path = /var/spool/samba
>      printable = Yes
>      browseable = No
>      browsable = No
> 
> 
> ----
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> Grazie.
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