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permission failures as ssh user -- only experienced by cygwin programs
- From: voigt at seas dot upenn dot edu
- To: cygwin at cygwin dot com
- Date: Tue, 15 Mar 2005 18:38:33 -0500
- Subject: permission failures as ssh user -- only experienced by cygwin programs
Hello all,
I'm been experiencing a failure of non-Administrator ssh accounts recently.
First, I thought they were caused by 3PP nxclient changing the /tmp mount point,
but I got that changed back and rebooted and now /tmp is mounted normally again.
It seems that cygwin is somehow causing GetFileInformation to fail.
The id command and all file access fails as a result. An administrator account
connected via ssh works fine, id produces good output.
The user for ssh has a publickey, another with a password, and they both
experience the same symptoms. I even compiled the cygwin source package, but
the source code isn't providing much help.
Before I replaced cygwin1.dll with the latest snapshot, cygpath -w /tmp was also
failing.
Here is what happens (I've set my shell to cmd.exe temporarily because bash and
tcsh are totally useless, bash says fork failure and tcsh says no more processes):
[Ben@rbv4531 ~]$ ssh svn
Last login: Tue Mar 15 18:19:17 2005 from 127.0.0.1
Fanfare!!!
You are successfully logged in to this server!!!
Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
[rbv4531] f:\Programming\svnrepos>dir c:\cygwin
dir c:\cygwin
Volume in drive C is System
Volume Serial Number is 58E5-4EED
Directory of c:\cygwin
22-01-2005 22:57 <DIR> .
22-01-2005 22:57 <DIR> ..
14-02-2003 22:56 <DIR> .ssh
15-03-2005 18:07 <DIR> bin
22-01-2005 22:57 <DIR> cygdrive
24-09-2002 12:43 57 cygwin.bat
15-03-2005 15:43 7,022 cygwin.ico
10-03-2003 19:21 52,352 debugs.lib
15-03-2005 18:19 <DIR> etc
30-01-2005 03:17 <DIR> home
15-03-2005 14:31 <DIR> lib
14-02-2003 22:57 <DIR> octave-forge-2002.05.09
23-01-2005 13:46 <DIR> opt
15-03-2005 17:16 <DIR> tmp
02-03-2005 00:54 <DIR> usr
15-03-2005 14:31 <DIR> var
3 File(s) 59,431 bytes
13 Dir(s) 7,269,064,704 bytes free
[rbv4531] f:\Programming\svnrepos>cygpath c:\cygwin
cygpath c:\cygwin
/
[rbv4531] f:\Programming\svnrepos>cygpath -w /
cygpath -w /
C:\cygwin
[rbv4531] f:\Programming\svnrepos>ls /
ls /
ls: /: Permission denied
[rbv4531] f:\Programming\svnrepos>cygpath -w /tmp
cygpath -w /tmp
C:\cygwin\tmp
[rbv4531] f:\Programming\svnrepos>dir c:\cygwin\tmp
dir c:\cygwin\tmp
Volume in drive C is System
Volume Serial Number is 58E5-4EED
Directory of c:\cygwin\tmp
15-03-2005 17:16 <DIR> .
15-03-2005 17:16 <DIR> ..
15-03-2005 14:43 <DIR> .X11-unix
01-02-2005 09:23 0 cciPNW7d.c
01-02-2005 09:23 13,064 ccmpga8l.ld
01-02-2005 09:23 0 ccqurJ5h.o
15-02-2005 01:10 419,582 colinux-20050212.src.tar.gz
30-01-2005 03:17 1,453 fcgipl.log
15-03-2005 14:43 3,916,720 MultiFileMsg2
15-03-2005 14:43 23,568 MultiFileSem2
15-03-2005 14:43 204,304 MultiFileShm2
15-03-2005 14:43 2,516 NXWin.log
04-02-2005 20:03 29,062 XWin.log
10 File(s) 4,610,269 bytes
3 Dir(s) 7,269,064,704 bytes free
[rbv4531] f:\Programming\svnrepos>ls /tmp
ls /tmp
ls: /tmp: Permission denied
[rbv4531] f:\Programming\svnrepos>ls c:\cygwin
ls c:\cygwin
ls: c:\cygwin: Permission denied
[rbv4531] f:\Programming\svnrepos>ls c:\cygwin\tmp
ls c:\cygwin\tmp
ls: c:\cygwin\tmp: Permission denied
[rbv4531] f:\Programming\svnrepos>id
id
uid=400(SYSTEM) gid=401(mkpasswd) groups=401(mkpasswd)
The user and group are listed in /etc/passwd and /etc/group.
The account used to work perfectly (it is a subversion server).
"type c:\cygwin\etc\passwd" produces output, there's no reason the lookup should
fail.
I've compiled the portion of cygwin that doesn't require mingw, and I'd be happy
to try out any fixes or add debugging output.
>From strace I get
198 40402 [main] id 988 mount_info::conv_to_win32_path: conv_to_win32_path
(/etc/passwd)
183 40585 [main] id 988 set_flags: flags: binary (0x2)
192 40777 [main] id 988 mount_info::conv_to_win32_path: src_path
/etc/passwd, dst C:\cygwin\etc\passwd, flags 0xA, rc 0
367 41144 [main] id 988 symlink_info::check: GetFileAttributes
(C:\cygwin\etc\passwd) failed
220 41364 [main] id 988 geterrno_from_win_error: windows error 5 == errno 13
305 41669 [main] id 988 symlink_info::check: GetFileAttributes
(C:\cygwin\etc\passwd.lnk) failed
299 41968 [main] id 988 geterrno_from_win_error: windows error 5 == errno 13
134 42102 [main] id 988 symlink_info::check: 0 = symlink.check
(C:\cygwin\etc\passwd, 0x22E8E0) (0xA)
600 42702 [main] id 988 path_conv::check: this->path(C:\cygwin\etc\passwd),
has_acls(1)
399 43101 [main] id 988 etc::test_file_change: FindFirstFile failed, Win32
error 5
1018 44119 [main] id 988 pwdgrp::load: /etc/passwd load failed
451 44570 [main] id 988 cygheap_user::ontherange: what 2, pw 0x0
214 44784 [main] id 988 cygheap_user::ontherange: HOME is already in the
environment /cygdrive/f/Programming/svnrepos
626 45410 [main] id 988 pwdgrp::read_passwd: Completing /etc/passwd:
SYSTEM:*:400:401:,S-1-5-21-1606980848-602162358-725345543-1023:/cygdrive/f/Programming/svnrepos:/bin/sh
190 45600 [main] id 988 normalize_posix_path: src /etc/group
192 45792 [main] id 988 normalize_posix_path: /etc/group =
normalize_posix_path (/etc/group)
182 45974 [main] id 988 mount_info::conv_to_win32_path: conv_to_win32_path
(/etc/group)
196 46170 [main] id 988 set_flags: flags: binary (0x2)
182 46352 [main] id 988 mount_info::conv_to_win32_path: src_path /etc/group,
dst C:\cygwin\etc\group, flags 0xA, rc 0
382 46734 [main] id 988 symlink_info::check: GetFileAttributes
(C:\cygwin\etc\group) failed
233 46967 [main] id 988 geterrno_from_win_error: windows error 5 == errno 13
368 47335 [main] id 988 symlink_info::check: GetFileAttributes
(C:\cygwin\etc\group.lnk) failed
319 47654 [main] id 988 geterrno_from_win_error: windows error 5 == errno 13
260 47914 [main] id 988 symlink_info::check: 0 = symlink.check
(C:\cygwin\etc\group, 0x22E8A0) (0xA)
188 48102 [main] id 988 path_conv::check: this->path(C:\cygwin\etc\group),
has_acls(1)
277 48379 [main] id 988 etc::test_file_change: FindFirstFile failed, Win32
error 5
Ben Voigt
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