* ftpd is denied access to a dir
@ 2007-10-02 1:28 Michael Klinosky
2007-10-02 13:52 ` Daniel J Walsh
0 siblings, 1 reply; 3+ messages in thread
From: Michael Klinosky @ 2007-10-02 1:28 UTC (permalink / raw)
To: SElinux
I have Fedora 7, using gnome. (Btw: when I hunted for SElinux maillists,
I didn't find one for Fedora specificallly. Is there a website?)
I installed pure-ftpd on my personal computer (for my own use). It's
version 1.0.21-12, and there's an SElinux package for it (both listed in
the package manager).
When I run the server as a xinetd service, and attempt a unix-style log
in (with gftp, on my LAN), I get this from gftp:
Connected to 10.0.0.50:21
220 (text)
220 (text)
USER mpk
331 user mpk OK. Password required.
PASS xxxx
530 user authentication failed
Disconnected from 10.0.0.50.
On 10.0.0.50, this is in the SElinux troubleshooter:
>> ALERT 1
Summary
SELinux is preventing the ftp daemon from writing files outside the
home directory (pure-ftpd).
Detailed Description
SELinux has denied the ftp daemon write access to directories
outside the home directory (pure-ftpd). Someone has logged in via your
ftp daemon and is trying to create or write a file. If you only setup
ftp to allow anonymous ftp, this could signal a intrusion attempt.
Allowing Access
If you do not want SELinux preventing ftp from writing files
anywhere on the system you need to turn on the allow_ftpd_full_access
boolean:
"setsebool -P allow_ftpd_full_access=1"
The following command will allow this access:
setsebool -P allow_ftpd_full_access=1
Additional Information
Source Context user_u:system_r:ftpd_t
Target Context user_u:object_r:var_run_t
Target Objects pure-ftpd [ dir ]
Affected RPM Packages pure-ftpd-1.0.21-12.fc7 [application]
Policy RPM selinux-policy-2.6.4-8.fc7
Selinux Enabled True
Policy Type targeted
MLS Enabled True
Enforcing Mode Enforcing
Plugin Name plugins.allow_ftpd_full_access
Host Name d500.localdomain
Platform Linux d500.localdomain 2.6.21-1.3228.fc7
#1 SMP Tue Jun 12 15:37:31 EDT 2007 i686 i686
Alert Count 6
First Seen Sat 25 Aug 2007 09:54:58 AM EDT
Last Seen Sat 25 Aug 2007 10:30:03 AM EDT
Local ID a8f17786-d787-4b38-86a2-ce3309391690
Line Numbers
Raw Audit Messages
avc: denied { create } for comm="pure-ftpd" egid=0 euid=0
exe="/usr/sbin/pure-
ftpd" exit=-13 fsgid=0 fsuid=0 gid=0 items=0 name="pure-ftpd" pid=28641
scontext=user_u:system_r:ftpd_t:s0 sgid=0 subj=user_u:system_r:ftpd_t:s0
suid=0 tclass=dir tcontext=user_u:object_r:var_run_t:s0 tty=(none) uid=0
**
I issued that command, and it apparently worked (no complaint displayed).
>> ALERT 2
Summary
SELinux is preventing /usr/sbin/pure-ftpd (ftpd_t) "search" to net
(proc_net_t).
Detailed Description
SELinux denied access requested by /usr/sbin/pure-ftpd. It is not
expected that this access is required by /usr/sbin/pure-ftpd and this
access may signal an intrusion attempt. It is also possible that the
specific version or configuration of the application is causing it to
require additional access.
Allowing Access
Sometimes labeling problems can cause SELinux denials. You could
try to restore the default system file context for net, restorecon -v
net If this does not work, there is currently no automatic way to allow
this access. Instead, you can generate a local policy module to allow
this access - see
http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385 Or you can
disable SELinux protection altogether. Disabling SELinux protection is
not recommended. Please file a
http://bugzilla.redhat.com/bugzilla/enter_bug.cgi
against this package.
Additional Information
Source Context user_u:system_r:ftpd_t
Target Context system_u:object_r:proc_net_t
Target Objects net [ dir ]
Affected RPM Packages pure-ftpd-1.0.21-12.fc7 [application]
Policy RPM selinux-policy-2.6.4-8.fc7
Selinux Enabled True
Policy Type targeted
MLS Enabled True
Enforcing Mode Enforcing
Plugin Name plugins.catchall_file
Host Name d500.localdomain
Platform Linux d500.localdomain 2.6.21-1.3228.fc7
#1 SMP Tue Jun 12 15:37:31 EDT 2007 i686 i686
Alert Count 12
First Seen Thu 30 Aug 2007 09:26:07 PM EDT
Last Seen Thu 06 Sep 2007 09:30:33 PM EDT
Local ID 8958c16e-27eb-4d3f-ad5c-787c1a960769
Line Numbers
Raw Audit Messages
avc: denied { search } for comm="pure-ftpd" dev=proc egid=0 euid=0
exe="/usr/sbin/pure-ftpd" exit=-13 fsgid=0 fsuid=0 gid=0 items=0 name="net"
pid=19097 scontext=user_u:system_r:ftpd_t:s0 sgid=0
subj=user_u:system_r:ftpd_t:s0 suid=0 tclass=dir
tcontext=system_u:object_r:proc_net_t:s0 tty=(none) uid=0
**
I tried to allow access; I saw that there is a directory 'net' in proc:
[root@d500 proc]# restorecon -v net
lstat(net) failed: Permission denied
Now what? Did I do this wrong, or do I need to create a 'local policy
module'?
Btw - if I run pure-ftpd as a standalone, I can login fine (but I don't
want to).
--
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: ftpd is denied access to a dir
2007-10-02 1:28 ftpd is denied access to a dir Michael Klinosky
@ 2007-10-02 13:52 ` Daniel J Walsh
2007-10-03 23:52 ` Michael Klinosky
0 siblings, 1 reply; 3+ messages in thread
From: Daniel J Walsh @ 2007-10-02 13:52 UTC (permalink / raw)
To: Michael Klinosky; +Cc: SElinux
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Michael Klinosky wrote:
> I have Fedora 7, using gnome. (Btw: when I hunted for SElinux maillists,
> I didn't find one for Fedora specificallly. Is there a website?)
>
> I installed pure-ftpd on my personal computer (for my own use). It's
> version 1.0.21-12, and there's an SElinux package for it (both listed in
> the package manager).
>
> When I run the server as a xinetd service, and attempt a unix-style log
> in (with gftp, on my LAN), I get this from gftp:
>
> Connected to 10.0.0.50:21
> 220 (text)
> 220 (text)
> USER mpk
> 331 user mpk OK. Password required.
> PASS xxxx
> 530 user authentication failed
> Disconnected from 10.0.0.50.
>
> On 10.0.0.50, this is in the SElinux troubleshooter:
>
>>> ALERT 1
>
> Summary
> SELinux is preventing the ftp daemon from writing files outside the
> home directory (pure-ftpd).
>
> Detailed Description
> SELinux has denied the ftp daemon write access to directories
> outside the home directory (pure-ftpd). Someone has logged in via your
> ftp daemon and is trying to create or write a file. If you only setup
> ftp to allow anonymous ftp, this could signal a intrusion attempt.
>
> Allowing Access
> If you do not want SELinux preventing ftp from writing files
> anywhere on the system you need to turn on the allow_ftpd_full_access
> boolean:
> "setsebool -P allow_ftpd_full_access=1"
>
> The following command will allow this access:
> setsebool -P allow_ftpd_full_access=1
>
> Additional Information
>
> Source Context user_u:system_r:ftpd_t
> Target Context user_u:object_r:var_run_t
> Target Objects pure-ftpd [ dir ]
> Affected RPM Packages pure-ftpd-1.0.21-12.fc7 [application]
> Policy RPM selinux-policy-2.6.4-8.fc7
> Selinux Enabled True
> Policy Type targeted
> MLS Enabled True
> Enforcing Mode Enforcing
> Plugin Name plugins.allow_ftpd_full_access
> Host Name d500.localdomain
> Platform Linux d500.localdomain 2.6.21-1.3228.fc7
> #1 SMP Tue Jun 12 15:37:31 EDT 2007 i686 i686
> Alert Count 6
> First Seen Sat 25 Aug 2007 09:54:58 AM EDT
> Last Seen Sat 25 Aug 2007 10:30:03 AM EDT
> Local ID a8f17786-d787-4b38-86a2-ce3309391690
> Line Numbers
>
> Raw Audit Messages
>
> avc: denied { create } for comm="pure-ftpd" egid=0 euid=0
> exe="/usr/sbin/pure-
> ftpd" exit=-13 fsgid=0 fsuid=0 gid=0 items=0 name="pure-ftpd" pid=28641
> scontext=user_u:system_r:ftpd_t:s0 sgid=0 subj=user_u:system_r:ftpd_t:s0
> suid=0 tclass=dir tcontext=user_u:object_r:var_run_t:s0 tty=(none) uid=0
>
> **
>
> I issued that command, and it apparently worked (no complaint displayed).
>
>>> ALERT 2
>
> Summary
> SELinux is preventing /usr/sbin/pure-ftpd (ftpd_t) "search" to net
> (proc_net_t).
>
> Detailed Description
> SELinux denied access requested by /usr/sbin/pure-ftpd. It is not
> expected that this access is required by /usr/sbin/pure-ftpd and this
> access may signal an intrusion attempt. It is also possible that the
> specific version or configuration of the application is causing it to
> require additional access.
> Allowing Access
> Sometimes labeling problems can cause SELinux denials. You could
> try to restore the default system file context for net, restorecon -v
> net If this does not work, there is currently no automatic way to allow
> this access. Instead, you can generate a local policy module to allow
> this access - see
> http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385 Or you can
> disable SELinux protection altogether. Disabling SELinux protection is
> not recommended. Please file a
> http://bugzilla.redhat.com/bugzilla/enter_bug.cgi
> against this package.
>
> Additional Information
> Source Context user_u:system_r:ftpd_t
> Target Context system_u:object_r:proc_net_t
> Target Objects net [ dir ]
> Affected RPM Packages pure-ftpd-1.0.21-12.fc7 [application]
> Policy RPM selinux-policy-2.6.4-8.fc7
> Selinux Enabled True
> Policy Type targeted
> MLS Enabled True
> Enforcing Mode Enforcing
> Plugin Name plugins.catchall_file
> Host Name d500.localdomain
> Platform Linux d500.localdomain 2.6.21-1.3228.fc7
> #1 SMP Tue Jun 12 15:37:31 EDT 2007 i686 i686
> Alert Count 12
> First Seen Thu 30 Aug 2007 09:26:07 PM EDT
> Last Seen Thu 06 Sep 2007 09:30:33 PM EDT
> Local ID 8958c16e-27eb-4d3f-ad5c-787c1a960769
> Line Numbers
>
> Raw Audit Messages
> avc: denied { search } for comm="pure-ftpd" dev=proc egid=0 euid=0
> exe="/usr/sbin/pure-ftpd" exit=-13 fsgid=0 fsuid=0 gid=0 items=0 name="net"
> pid=19097 scontext=user_u:system_r:ftpd_t:s0 sgid=0
> subj=user_u:system_r:ftpd_t:s0 suid=0 tclass=dir
> tcontext=system_u:object_r:proc_net_t:s0 tty=(none) uid=0
>
> **
>
> I tried to allow access; I saw that there is a directory 'net' in proc:
> [root@d500 proc]# restorecon -v net
> lstat(net) failed: Permission denied
>
> Now what? Did I do this wrong, or do I need to create a 'local policy
> module'?
>
> Btw - if I run pure-ftpd as a standalone, I can login fine (but I don't
> want to).
>
>
> --
> This message was distributed to subscribers of the selinux mailing list.
> If you no longer wish to subscribe, send mail to majordomo@tycho.nsa.gov
> with
> the words "unsubscribe selinux" without quotes as the message.
Well first thing I would do is update to the latest selinux policy
yum upgrade selinux-policy
That might fix some/all of your problems.
It probably would be a good idea to update all of the fedora packages.
yum upgrade
Looking at the current policy the creation of the pid file (var_run_t)
should be allowed. The second avc is fixed in Fedora 8/Rawhide but not
in FC7. So I will add it in the next update.
A better list to ask about Fedora SELinux questions is
"Fedora SELinux support list for users & developers."
<fedora-selinux-list@redhat.com>
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: ftpd is denied access to a dir
2007-10-02 13:52 ` Daniel J Walsh
@ 2007-10-03 23:52 ` Michael Klinosky
0 siblings, 0 replies; 3+ messages in thread
From: Michael Klinosky @ 2007-10-03 23:52 UTC (permalink / raw)
To: NSA SElinux
Daniel:
> Well first thing I would do is update to the latest selinux policy
I did that already (about 2 weeks ago). I asked about this on the
general Fedora list, and that was recommended.
> Looking at the current policy the creation of the pid file (var_run_t)
> should be allowed. The second avc is fixed in Fedora 8/Rawhide but not
> in FC7. So I will add it in the next update.
> A better list to ask about Fedora SELinux questions is
> "Fedora SELinux support list for users & developers."
> <fedora-selinux-list@redhat.com>
OK - found it, and subscribed.
And, someone posted to the list about selinux denying httpd access to a
file. So, perhaps the SElinux people still have to tweak on things (as
you mentioned there, about the pid file).
--
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If you no longer wish to subscribe, send mail to majordomo@tycho.nsa.gov with
the words "unsubscribe selinux" without quotes as the message.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2007-10-04 0:17 UTC | newest]
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2007-10-02 1:28 ftpd is denied access to a dir Michael Klinosky
2007-10-02 13:52 ` Daniel J Walsh
2007-10-03 23:52 ` Michael Klinosky
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