Richard Chapman wrote:
After some trouble getting the file-system relabelled - which was
eventually solved by Daniel's suggestion to change to a 5.3 preview
release of the policy packages - I now have (only) a couple of
intractable denials.
One seems to be related to procmail running spamc. The other seems to be
webalizer being denied access to squid logs. Here is some representative
troubledhooter output:
Summary
SELinux is preventing spamc (procmail_t) "execute" to ./spamc
(spamc_exec_t).
Detailed Description
[SELinux is in permissive mode, the operation would have been denied but
was permitted due to permissive mode.]
SELinux denied access requested by spamc. It is not expected that this
access is required by spamc 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 ./spamc,
restorecon -v './spamc'
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 FAQ
<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 bug report
<http://bugzilla.redhat.com/bugzilla/enter_bug.cgi> against this package.
Additional Information
Source Context: system_u:system_r:procmail_t
Target Context: system_u:object_r:spamc_exec_t
Target Objects: ./spamc [ file ]
Source: spamc
Source Path: /usr/bin/spamc
Port: <Unknown>
Host: C5.aardvark.com.au
Source RPM Packages: spamassassin-3.2.4-1.el5
Target RPM Packages:
Policy RPM: selinux-policy-2.4.6-203.el5
Selinux Enabled: True
Policy Type: targeted
MLS Enabled: True
Enforcing Mode: Permissive
Plugin Name: catchall_file
Host Name: C5.aardvark.com.au
Platform: Linux C5.aardvark.com.au 2.6.18-92.1.22.el5 #1 SMP Tue Dec
16 11:57:43 EST 2008 x86_64 x86_64
Alert Count: 199
First Seen: Wed Jan 7 21:12:56 2009
Last Seen: Sat Jan 10 13:50:07 2009
Local ID: 72201679-d161-4d2d-8423-44b1b65a211f
Line Numbers:
Fedora 10 has a rule that looks like it would resolve this issue:
$ sesearch --allow -s procmail_t -t spamc_exec_t
WARNING: This policy contained disabled aliases; they have been removed.
Found 1 semantic av rules:
allow procmail_t spamc_exec_t : file { ioctl read getattr execute } ;
selinux-policy-3.5.13-38.fc10.noarch
selinux-policy-targeted-3.5.13-38.fc10.noarch
Do you have this rule when running the 5.3 preview packages? I am not
sure about your webalizer issue...
Raw Audit Messages :
host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc:
denied { execute } for pid=16474 comm="procmail" name="spamc" dev=dm-0
ino=31336954 scontext=system_u:system_r:procmail_t:s0
tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file
host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc:
denied { execute } for pid=16474 comm="procmail" name="spamc" dev=dm-0
ino=31336954 scontext=system_u:system_r:procmail_t:s0
tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file
host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc:
denied { execute_no_trans } for pid=16474 comm="procmail"
path="/usr/bin/spamc" dev=dm-0 ino=31336954
scontext=system_u:system_r:procmail_t:s0
tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file
host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc:
denied { execute_no_trans } for pid=16474 comm="procmail"
path="/usr/bin/spamc" dev=dm-0 ino=31336954
scontext=system_u:system_r:procmail_t:s0
tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file
host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc:
denied { read } for pid=16474 comm="procmail" path="/usr/bin/spamc"
dev=dm-0 ino=31336954 scontext=system_u:system_r:procmail_t:s0
tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file
host=C5.aardvark.com.au type=AVC msg=audit(1231563007.814:8005): avc:
denied { read } for pid=16474 comm="procmail" path="/usr/bin/spamc"
dev=dm-0 ino=31336954 scontext=system_u:system_r:procmail_t:s0
tcontext=system_u:object_r:spamc_exec_t:s0 tclass=file
host=C5.aardvark.com.au type=SYSCALL msg=audit(1231563007.814:8005):
arch=c000003e syscall=59 success=yes exit=0 a0=196772e0 a1=196792a0
a2=196791f0 a3=8 items=0 ppid=16473 pid=16474 auid=4294967295 uid=500
gid=501 euid=500 suid=500 fsuid=500 egid=501 sgid=501 fsgid=501
tty=(none) ses=4294967295 comm="spamc" exe="/usr/bin/spamc"
subj=system_u:system_r:procmail_t:s0 key=(null)
host=C5.aardvark.com.au type=SYSCALL msg=audit(1231563007.814:8005):
arch=c000003e syscall=59 success=yes exit=0 a0=196772e0 a1=196792a0
a2=196791f0 a3=8 items=0 ppid=16473 pid=16474 auid=4294967295 uid=500
gid=501 euid=500 suid=500 fsuid=500 egid=501 sgid=501 fsgid=501
tty=(none) ses=4294967295 comm="spamc" exe="/usr/bin/spamc"
subj=system_u:system_r:procmail_t:s0 key=(null)
Summary
SELinux is preventing webalizer (webalizer_t) "search" to ./webalizer
(bin_t).
Detailed Description
[SELinux is in permissive mode, the operation would have been denied but
was permitted due to permissive mode.]
SELinux denied access requested by webalizer. It is not expected that
this access is required by webalizer 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 ./webalizer,
restorecon -v './webalizer'
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 FAQ
<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 bug report
<http://bugzilla.redhat.com/bugzilla/enter_bug.cgi> against this package.
Additional Information
Source Context: root:system_r:webalizer_t:SystemLow-SystemHigh
Target Context: system_u:object_r:bin_t
Target Objects: ./webalizer [ dir ]
Source: webalizer
Source Path: /usr/bin/webalizer
Port: <Unknown>
Host: C5.aardvark.com.au
Source RPM Packages: webalizer-2.01_10-30.1
Target RPM Packages:
Policy RPM: selinux-policy-2.4.6-203.el5
Selinux Enabled: True
Policy Type: targeted
MLS Enabled: True
Enforcing Mode: Permissive
Plugin Name: catchall_file
Host Name: C5.aardvark.com.au
Platform: Linux C5.aardvark.com.au 2.6.18-92.1.22.el5 #1 SMP Tue Dec
16 11:57:43 EST 2008 x86_64 x86_64
Alert Count: 119
First Seen: Wed Jan 7 22:00:02 2009
Last Seen: Sat Jan 10 14:00:01 2009
Local ID: fd879861-abb1-4e67-a190-0a721c66dc0e
Line Numbers:
Raw Audit Messages :
host=C5.aardvark.com.au type=AVC msg=audit(1231563601.389:8027): avc:
denied { search } for pid=16510 comm="webalizer" name="webalizer"
dev=dm-0 ino=32479105 scontext=root:system_r:webalizer_t:s0-s0:c0.c1023
tcontext=system_u:object_r:bin_t:s0 tclass=dir
host=C5.aardvark.com.au type=AVC msg=audit(1231563601.389:8027): avc:
denied { search } for pid=16510 comm="webalizer" name="webalizer"
dev=dm-0 ino=32479105 scontext=root:system_r:webalizer_t:s0-s0:c0.c1023
tcontext=system_u:object_r:bin_t:s0 tclass=dir
host=C5.aardvark.com.au type=SYSCALL msg=audit(1231563601.389:8027):
arch=c000003e syscall=4 success=no exit=-2 a0=4171ee a1=7fff7d310db0
a2=7fff7d310db0 a3=21000 items=0 ppid=16509 pid=16510 auid=0 uid=0 gid=0
euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=730
comm="webalizer" exe="/usr/bin/webalizer"
subj=root:system_r:webalizer_t:s0-s0:c0.c1023 key=(null)
host=C5.aardvark.com.au type=SYSCALL msg=audit(1231563601.389:8027):
arch=c000003e syscall=4 success=no exit=-2 a0=4171ee a1=7fff7d310db0
a2=7fff7d310db0 a3=21000 items=0 ppid=16509 pid=16510 auid=0 uid=0 gid=0
euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=730
comm="webalizer" exe="/usr/bin/webalizer"
subj=root:system_r:webalizer_t:s0-s0:c0.c1023 key=(null)
I didn't think I was doing anything unusual here - so I am surprised
these aren't covered by standard policy. Am I don't something strange -
and if so - do I need to write my own local policy. Is there a more
standard way to run spamc and/.or webalizer which will prevent these
denials?
Thanks
Richard.
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