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[Florian Lentz <1951490@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

After updating my AD-DC to samba 4.13 I am unable to print from normal
user accounts (Windows is logging "Win32 error code returned by the
print processor: 50. The request is not supported."). Also the Log is
full with entries like this:

[2021/11/19 01:48:37.496949,  0] ../../source3/rpc_server/rpc_server.c:1086(dcesrv_auth_gensec_prepare)
   dcesrv_auth_gensec_prepare: Failed to prepare gensec: NT_STATUS_INVALID_SERVER_STATE

Enabling debug logs show that this is caused by the ownership of a
directory which samba complains is not matching:

[2021/11/19 01:48:37.482365,  4, effective(30000XX, 100), real(30000XX, 0)] ../../source3/rpc_server/rpc_ncacn_np.c:110(make_internal_rpc_pipe_socketpair)
  Create of internal pipe \pipe\spoolss requested
[2021/11/19 01:48:37.485785,  3, effective(30000XX, 100), real(30000XX, 0)] ../../lib/util/util.c:483(directory_create_or_exist_strict)
  directory_create_or_exist_strict: invalid ownership on directory /var/lib/samba/private/msg.sock
[2021/11/19 01:48:37.485807,  1, effective(30000XX, 100), real(30000XX, 0)] ../../source3/auth/auth_samba4.c:248(prepare_gensec)
  imessaging_init failed 

That is, because /var/lib/samba/private/msg.sock is owned by root:root
in my case (and it gets created with those permissions aswell if I
delete it), but https://github.com/samba-
team/samba/blob/db11778b57610e24324aa4342f89918f66157d71/source4/lib/messaging/messaging.c#L507
uses geteuid() which is sometimes the user ID of the connecting user (as
can be seen above, XX is the number that represents the uid of the
windows user connecting).

I am not sure if this is also the cause for the printing issue, but this
spam in the log is super annoying aswell and should be fixed.

Futher information about the system:
Description:    Ubuntu 20.04.3 LTS
Release:        20.04
Arch:           amd64
Samba-Version:  2:4.13.14+dfsg-0ubuntu0.20.04.1

** Affects: samba (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1951490

Title:
  Can't print after update to 4.13

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