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Steffen Kaiser

2007-Jul-04 14:50 UTC

[Dovecot] Dovecot shared mailbox folder problem

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Hello,

I've set up a namespace to share some mailboxes.

When I try to select them, I get an internal error:

Client-server chat:

* OK Dovecot ready.
1 login dvtest2 x
1 OK Logged in.
2 list "" *
* LIST (\HasNoChildren) "." "Trash"
* LIST (\HasChildren) "." "test"
* LIST (\HasNoChildren) "." "INBOX"
* LIST (\HasNoChildren) "." "test.test2"
* LIST (\Noselect \HasChildren) "." "Shared"
* LIST (\HasNoChildren) "." "Shared.testAccess"
* LIST (\HasNoChildren) "." "Shared.testNOaccess"
2 OK List completed.
3 select "Shared.testAccess"
3 NO Internal error occurred. Refer to server log for more information. 
[2007-07-04 16:45:31]

dovecot: Jul 04 16:45:31 Error: IMAP(dvtest2) [3512]: 
stat(/mnt/mailcache/shared/.testAccess/cur) failed: Permission denied

# l /mnt/mailcache/shared/.testAccess -n
total 24
drwxrws--- 5 31045 30005 4096 2007-07-04 15:53 ./
drwxr-xr-x 6     0     0 4096 2007-07-04 16:08 ../
drwxrwsr-x 2 31045 30005 4096 2007-06-21 12:19 cur/
- -rw-r--r-- 1 31045 30005   17 2007-07-04 15:38 dovecot-acl
- -rw-rw---- 1 31045 30005    0 2007-07-04 15:53 dovecot-shared
drwxrws--- 2 31045 30005 4096 2007-06-21 13:57 new/
drwxrws--- 2 31045 30005 4096 2007-06-21 13:57 tmp/

I added chmod o+rx for testing purpose, just in case.

stracing the situation results in:

gettimeofday({1183560101, 339756}, {4294967176, 0}) = 0
read(0, "3 select \"Shared.testAccess\"\r\n", 3978) = 30
setsockopt(1, SOL_TCP, TCP_CORK, [1], 4) = 0
stat64("/mnt/mailcache/shared/.testAccess",
{st_mode=S_IFDIR|S_ISGID|0770,
st_size=4096, ...}) = 0
stat64("/mnt/mailcache/shared/.testAccess/cur", 0xbf8cb470) = -1
EACCES
(Permission denied)
write(2, "\1Estat(/mnt/mailcache/shared/.te"..., 72) = 72
stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=837, ...}) = 0
write(1, "3 NO Internal error occurred. Re"..., 95) = 95
setsockopt(1, SOL_TCP, TCP_CORK, [0], 4) = 0
gettimeofday({1183560101, 341458}, NULL) = 0

What do I wrong?

# 1.0.1: /usr/local/dovecot/etc/dovecot.conf
base_dir: /var/run/dovecot/
log_path: /var/log/dovecot/dovecot.log
protocols: imap imaps pop3 pop3s
ssl_ca_file: /etc/ssl/certs/ca.crt
ssl_cert_file(default): /etc/ssl/certs/imap.pem
ssl_cert_file(imap): /etc/ssl/certs/imap.pem
ssl_cert_file(pop3): /etc/ssl/certs/pop3.pem
ssl_key_file(default): /etc/ssl/private/imap.key
ssl_key_file(imap): /etc/ssl/private/imap.key
ssl_key_file(pop3): /etc/ssl/private/pop3.key
disable_plaintext_auth: no
verbose_ssl: yes
login_dir: /var/run/dovecot//login
login_executable(default): /usr/local/dovecot/libexec/dovecot/imap-login
login_executable(imap): /usr/local/dovecot/libexec/dovecot/imap-login
login_executable(pop3): /usr/local/dovecot/libexec/dovecot/pop3-login
login_log_format_elements: %p: user=<%u> method=%m rip=%r lip=%l %c
verbose_proctitle: yes
first_valid_uid: 1000
mail_location: 
maildir:%h/MailDir:CONTROL=/var/cache/dovecot/%i/control:INDEX=/var/cache/dovecot/%i/index
mail_debug: yes
dotlock_use_excl: yes
maildir_copy_with_hardlinks: yes
maildir_copy_preserve_filename: yes
umask: 7
mail_drop_priv_before_exec: yes
mail_executable(default): /usr/local/dovecot-1.0.1/libexec/dovecot/rawlog 
/usr/local/dovecot-1.0.1/libexec/dovecot/imap
mail_executable(imap): /usr/local/dovecot-1.0.1/libexec/dovecot/rawlog 
/usr/local/dovecot-1.0.1/libexec/dovecot/imap
mail_executable(pop3): /usr/local/dovecot/libexec/dovecot/pop3
mail_plugins(default): quota imap_quota mail_log zlib acl
mail_plugins(imap): quota imap_quota mail_log zlib acl
mail_plugins(pop3): quota mail_log
mail_plugin_dir(default): /usr/local/dovecot/lib/dovecot/imap
mail_plugin_dir(imap): /usr/local/dovecot/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/local/dovecot/lib/dovecot/pop3
mail_log_prefix: %Us(%u) [%p]:
mail_log_max_lines_per_sec: 0
pop3_uidl_format(default):
pop3_uidl_format(imap):
pop3_uidl_format(pop3): %u
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): oe-ns-eoh
namespace:
   type: private
   separator: .
   inbox: yes
   hidden: yes
namespace:
   type: public
   separator: .
   prefix: Shared.
   location: 
/mnt/mailcache/shared:CONTROL=/var/cache/dovecot/%i/sek/control:INDEX=/var/cache/dovecot/%i/sek/index
auth default:
   mechanisms: plain login
   cache_size: 10
   username_chars: 
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890
   verbose: yes
   debug: yes
   passdb:
     driver: ldap
     args: /usr/local/dovecot-1.0.1/etc/dovecot-ldap.conf
   userdb:
     driver: ldap
     args: /usr/local/dovecot-1.0.1/etc/dovecot-ldap.conf
   userdb:
     driver: passwd-file
     args: /etc/passwd
   socket:
     type: listen
     master:
       path: /var/run/dovecot/auth-master
       mode: 432
       group: mail
plugin:
   quota: fs

Bye,

- -- 
Steffen Kaiser
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Steffen Kaiser

2007-Jul-04 18:28 UTC

head link

[Dovecot] Dovecot shared mailbox folder problem

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On Wed, 4 Jul 2007, Steffen Kaiser wrote:
> # l /mnt/mailcache/shared/.testAccess -n
> total 24
> drwxrws--- 5 31045 30005 4096 2007-07-04 15:53 ./
> drwxr-xr-x 6     0     0 4096 2007-07-04 16:08 ../
> drwxrwsr-x 2 31045 30005 4096 2007-06-21 12:19 cur/
> -rw-r--r-- 1 31045 30005   17 2007-07-04 15:38 dovecot-acl
> -rw-rw---- 1 31045 30005    0 2007-07-04 15:53 dovecot-shared
>
> I added chmod o+rx for testing purpose, just in case.
Hmm, it would be possibly interessting to know who is who ;-)
# id dvtest2
uid=31022(dvtest2) gid=102(Debian-exim) 
groups=102(Debian-exim),30005(dvtestgrp)

The filesystem is a local, plain ext3 in Linux.
> stracing the situation results in:
> read(0, "3 select \"Shared.testAccess\"\r\n", 3978) =
30
> setsockopt(1, SOL_TCP, TCP_CORK, [1], 4) = 0
> stat64("/mnt/mailcache/shared/.testAccess",
{st_mode=S_IFDIR|S_ISGID|0770,
> st_size=4096, ...}) = 0
> stat64("/mnt/mailcache/shared/.testAccess/cur", 0xbf8cb470) = -1
EACCES
> (Permission denied)
The permissions of both directories are the same, aren' t they?
Why fails the 2nd stat(), but the 2st one succeeds?

Bye,
- -- 
Steffen Kaiser
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Timo Sirainen

2007-Jul-05 14:43 UTC

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[Dovecot] Dovecot shared mailbox folder problem

On Wed, 2007-07-04 at 16:50 +0200, Steffen Kaiser wrote:> drwxrws--- 5 31045 30005 4096 2007-07-04 15:53 ./
> drwxrwsr-x 2 31045 30005 4096 2007-06-21 12:19 cur/
The setuid-group bit hides group-x bit. The only thing I can think of is
cur/ isn't group-executable.


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Christian Skarby

2007-Jul-05 15:08 UTC

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[Dovecot] Dovecot shared mailbox folder problem

Den 05-07-2007 16:43, Timo Sirainen skrev:> On Wed, 2007-07-04 at 16:50 +0200, Steffen Kaiser wrote:
>> drwxrws--- 5 31045 30005 4096 2007-07-04 15:53 ./
>> drwxrwsr-x 2 31045 30005 4096 2007-06-21 12:19 cur/
> 
> The setuid-group bit hides group-x bit. The only thing I can think of is
> cur/ isn't group-executable.
> 
> 
To me it seems that it is group executable as it, at least on my linux 
systems, is shown as S when the directory is setgid but not group 
executable.

Excerpt from a test case on my ubuntu desktop, notice the missing x on 
cur and the S on cur in the latter listing. Also note that this differs 
from Steffen Kaiser's listing, where both directories have a lower case
s.> $ ls -la
> drwxrwx---   3 user group 4096 2007-07-05 16:49 .
> drwxrw----   2 user group 4096 2007-07-05 16:49 cur
> $ chmod -R g+s .
> $ ls -la .
> drwxrws---   3 user group 4096 2007-07-05 16:49 .
> drwxrwS---   2 user group 4096 2007-07-05 16:49 cur
However he might use another version of ls which fails to show this 
difference?

-- 
Best regards,
Christian

Steffen Kaiser

2007-Jul-06 05:57 UTC

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[Dovecot] Dovecot shared mailbox folder problem

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On Thu, 5 Jul 2007, Timo Sirainen wrote:
> On Wed, 2007-07-04 at 16:50 +0200, Steffen Kaiser wrote:
>> drwxrws--- 5 31045 30005 4096 2007-07-04 15:53 ./
>> drwxrwsr-x 2 31045 30005 4096 2007-06-21 12:19 cur/
>
> The setuid-group bit hides group-x bit. The only thing I can think of is
> cur/ isn't group-executable.
Linux' ls uses a capital S, if the executable permission is missing.

'.' has 02770 permissions.

That's really stange.

Bye.

- -- 
Steffen Kaiser
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