[Samba] unix fifo inaccessible via samba share

[Charles Redditt]

Issue: unix fifo (named pipe) does not appear in share,  attempts to read
the pipe result in "Access Denied"

>From an XP laptop, I can open and access my samba share normally.  I can
read all files and subdirectories in the share, but a fifo I need to read
does not appear at all.  I have made the fifo mode 777 (world readable,
writeable, executeable) and tried other things like setting " follow
symlinks = yes ", "unix extensions = no" and "log level = 3", making the
fifo name less than 8 char,  but nothing seems to help.  If I try to
directly read from the share, from a MSDOS cmdline, with a "type
\\server\myshare\mypipe" I get only an "Access Denied" message.

I have been able to do this for years on other machines, specifically one
running CentOS 5.5, smb version 3.0.33-3.29.el5_6.2

and yes,  I can read from the fifo w/o any problem from the linux
commandline.  I have also tried to read the fifo via smbclient but get much
the same result (smb: \> get mypipe
NT_STATUS_ACCESS_DENIED opening remote file \mypipe)


OS: CentOS 6  (64 bit)
samba Version: 3.5.4-68.el6_0.2

relevant portions of smb.conf:

     log level = 3
     unix extensions = no
     follow symlinks = yes
     security = user
     passdb backend = tdbsam
     encrypt passwords = yes

[myshare]
   comment = my comment
   path = /path/to/share
   public = yes
   writable = yes
   browseable = yes
   guest ok = yes
   write list = charlie

When I attempt to read the pipe from my laptop, the below appears in my
logfile ("/var/log/samba/log.mylaptop"):

[2011/07/19 16:17:23.363416,  3] smbd/process.c:1485(process_smb)
  Transaction 63 of length 80 (0 toread)
[2011/07/19 16:17:23.363605,  3] smbd/process.c:1294(switch_message)
  switch message SMBtrans2 (pid 8989) conn 0x7ff3f473b110
[2011/07/19 16:17:23.363679,  3] smbd/sec_ctx.c:310(set_sec_ctx)
  setting sec ctx (500, 500) - sec_ctx_stack_ndx = 0
[2011/07/19 16:17:23.364132,  3]
smbd/trans2.c:5099(call_trans2qfilepathinfo)
  call_trans2qfilepathinfo: TRANSACT2_QPATHINFO: level = 1004
[2011/07/19 16:17:23.364218,  3] smbd/vfs.c:851(check_reduced_name)
  check_reduced_name [.] [/path/to/share]
[2011/07/19 16:17:23.364296,  3] smbd/vfs.c:1008(check_reduced_name)
  check_reduced_name: . reduced to /path/to/share
[2011/07/19 16:17:23.364483,  3]
smbd/trans2.c:5225(call_trans2qfilepathinfo)
  call_trans2qfilepathinfo . (fnum = -1) level=1004 call=5 total_data=0
[2011/07/19 16:17:23.367804,  3] smbd/process.c:1485(process_smb)
  Transaction 64 of length 80 (0 toread)
[2011/07/19 16:17:23.367886,  3] smbd/process.c:1294(switch_message)
  switch message SMBtrans2 (pid 8989) conn 0x7ff3f473b110
[2011/07/19 16:17:23.367946,  3]
smbd/trans2.c:5099(call_trans2qfilepathinfo)
  call_trans2qfilepathinfo: TRANSACT2_QPATHINFO: level = 1005
[2011/07/19 16:17:23.368013,  3] smbd/vfs.c:851(check_reduced_name)
  check_reduced_name [.] [/path/to/share]
[2011/07/19 16:17:23.368078,  3] smbd/vfs.c:1008(check_reduced_name)
  check_reduced_name: . reduced to /path/to/share
[2011/07/19 16:17:23.368147,  3]
smbd/trans2.c:5225(call_trans2qfilepathinfo)
  call_trans2qfilepathinfo . (fnum = -1) level=1005 call=5 total_data=0
[2011/07/19 16:17:23.371384,  3] smbd/process.c:1485(process_smb)
  Transaction 65 of length 100 (0 toread)
[2011/07/19 16:17:23.371451,  3] smbd/process.c:1294(switch_message)
  switch message SMBtrans2 (pid 8989) conn 0x7ff3f473b110
[2011/07/19 16:17:23.371508,  3] smbd/trans2.c:2252(call_trans2findfirst)
  call_trans2findfirst: dirtype = 16, maxentries = 1366,
close_after_first=1, close_if_end = 1 requires_resume_key = 1 level = 0x104,
max_data_bytes = 16384
[2011/07/19 16:17:23.372288,  3] smbd/vfs.c:851(check_reduced_name)
  check_reduced_name [mypipe] [/path/to/share]
[2011/07/19 16:17:23.372510,  1] smbd/vfs.c:932(check_reduced_name)
  check_reduced_name: couldn't get realpath for mypipe
[2011/07/19 16:17:23.372590,  3] smbd/filename.c:1181(filename_convert)
  filename_convert: check_name failed for name mypipe with
NT_STATUS_ACCESS_DENIED
[2011/07/19 16:17:23.372644,  3] smbd/error.c:80(error_packet_set)
  error packet at smbd/trans2.c(2305) cmd=50 (SMBtrans2)
NT_STATUS_ACCESS_DENIED
[2011/07/19 16:17:25.339308,  3] smbd/sec_ctx.c:310(set_sec_ctx)
  setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0

thx,
-charlie