* Re: ausearch / policy question
@ 2008-07-25 6:27 Cai Xianchao
2008-07-25 17:36 ` LC Bruzenak
0 siblings, 1 reply; 6+ messages in thread
From: Cai Xianchao @ 2008-07-25 6:27 UTC (permalink / raw)
To: lenny, linux-audit
On Wednesday 23 July 2008 18:30:45 LC Bruzenak wrote:
> 2: why is ausearch producing the AVCs?
>
Low level is the minimum access needed to read files created by that
user.If the low level of a process is lower than the file's, it's
not permitted.
> type=AVC msg=audit(07/23/2008 17:18:44.292:1622) : avc: denied
> { read } for pid=4033 comm=ausearch name=audit.log dev=dm-0 ino=24698
> scontext=root:staff_r:staff_t:s0-s15:c0.c1023
> tcontext=system_u:object_r:auditd_log_t:s15:c0.c1023 tclass=file
>
>
In the message, the level of audit.log is s15:c0.c1023, while the current
process is s0. So the process can't read audit.log and AVSs are producted.
Regards
Cai Xianchao
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: ausearch / policy question
2008-07-25 6:27 ausearch / policy question Cai Xianchao
@ 2008-07-25 17:36 ` LC Bruzenak
2008-07-29 9:30 ` Cai Xianchao
0 siblings, 1 reply; 6+ messages in thread
From: LC Bruzenak @ 2008-07-25 17:36 UTC (permalink / raw)
To: Linux Audit
On Fri, 2008-07-25 at 14:27 +0800, Cai Xianchao wrote:
> > type=AVC msg=audit(07/23/2008 17:18:44.292:1622) : avc: denied
> > { read } for pid=4033 comm=ausearch name=audit.log dev=dm-0 ino=24698
> > scontext=root:staff_r:staff_t:s0-s15:c0.c1023
> > tcontext=system_u:object_r:auditd_log_t:s15:c0.c1023 tclass=file
> >
> >
>
> In the message, the level of audit.log is s15:c0.c1023, while the current
> process is s0. So the process can't read audit.log and AVSs are producted.
>
>
scontext includes sensitivity levels range s0-s15.
Doesn't that include tcontext sensitivity level s0 (same
classifications)?
Thx,
LCB.
--
LC (Lenny) Bruzenak
lenny@magitekltd.com
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: ausearch / policy question
2008-07-25 17:36 ` LC Bruzenak
@ 2008-07-29 9:30 ` Cai Xianchao
2008-07-29 14:36 ` LC Bruzenak
0 siblings, 1 reply; 6+ messages in thread
From: Cai Xianchao @ 2008-07-29 9:30 UTC (permalink / raw)
To: LC Bruzenak; +Cc: Linux Audit
LC Bruzenak said the following on 2008-07-26 1:36:
> On Fri, 2008-07-25 at 14:27 +0800, Cai Xianchao wrote:
>
>
>>> type=AVC msg=audit(07/23/2008 17:18:44.292:1622) : avc: denied
>>> { read } for pid=4033 comm=ausearch name=audit.log dev=dm-0 ino=24698
>>> scontext=root:staff_r:staff_t:s0-s15:c0.c1023
>>> tcontext=system_u:object_r:auditd_log_t:s15:c0.c1023 tclass=file
>>>
>>>
>>>
>>
>> In the message, the level of audit.log is s15:c0.c1023, while the current
>> process is s0. So the process can't read audit.log and AVSs are producted.
>>
>>
>>
> scontext includes sensitivity levels range s0-s15.
>
> Doesn't that include tcontext sensitivity level s0 (same
> classifications)?
>
> Thx,
> LCB.
>
In the message, low level of tcontext is equal to high level,
it is s15, not s0.
--
Regards
Cai Xianchao
A new email address of FJWAN is launched from Apr.1 2007.
The updated address is: caixianchao@cn.fujitsu.com
--------------------------------------------------
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Development Dept.I
Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST)
8/F., Civil Defense Building, No.189 Guangzhou Road,
Nanjing, 210029, China
TEL: +86+25-86630566-837
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Mail：caixianchao@cn.fujitsu.com
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^ permalink raw reply [flat|nested] 6+ messages in thread
* ausearch / policy question
@ 2008-07-23 22:30 LC Bruzenak
2008-07-24 19:12 ` Steve Grubb
0 siblings, 1 reply; 6+ messages in thread
From: LC Bruzenak @ 2008-07-23 22:30 UTC (permalink / raw)
To: Linux Audit
OK - now that my logs are classified correctly, I ran the following
ausearch command:
ausearch -ts recent -i -m AVC -c ausearch
And get these:
type=PATH msg=audit(07/23/2008 17:18:44.292:1620) : item=0
name=/etc/audit/auditd.conf inode=21112 dev=fd:00 mode=file,640
ouid=root ogid=root rdev=00:00
obj=system_u:object_r:auditd_etc_t:s15:c0.c1023
type=CWD msg=audit(07/23/2008 17:18:44.292:1620) : cwd=/var/log/audit
type=SYSCALL msg=audit(07/23/2008 17:18:44.292:1620) : arch=x86_64
syscall=open success=yes exit=3 a0=40f9d3 a1=20000 a2=c9c140
a3=3e2bf67a70 items=1 ppid=3451 pid=4033 auid=root uid=root gid=root
euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0
ses=1 comm=ausearch exe=/sbin/ausearch
subj=root:staff_r:staff_t:s0-s15:c0.c1023 key=(null)
type=AVC msg=audit(07/23/2008 17:18:44.292:1620) : avc: denied
{ read } for pid=4033 comm=ausearch name=auditd.conf dev=dm-0 ino=21112
scontext=root:staff_r:staff_t:s0-s15:c0.c1023
tcontext=system_u:object_r:auditd_etc_t:s15:c0.c1023 tclass=file
----
type=PATH msg=audit(07/23/2008 17:18:44.292:1622) : item=0
name=/var/log/audit/audit.log inode=24698 dev=fd:00 mode=file,600
ouid=root ogid=root rdev=00:00
obj=system_u:object_r:auditd_log_t:s15:c0.c1023
type=CWD msg=audit(07/23/2008 17:18:44.292:1622) : cwd=/var/log/audit
type=SYSCALL msg=audit(07/23/2008 17:18:44.292:1622) : arch=x86_64
syscall=open success=yes exit=4 a0=7fff89bcdefb a1=0 a2=3e2bf67a60
a3=3e2bf67a58 items=1 ppid=3451 pid=4033 auid=root uid=root gid=root
euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0
ses=1 comm=ausearch exe=/sbin/ausearch
subj=root:staff_r:staff_t:s0-s15:c0.c1023 key=(null)
type=AVC msg=audit(07/23/2008 17:18:44.292:1622) : avc: denied
{ read } for pid=4033 comm=ausearch name=audit.log dev=dm-0 ino=24698
scontext=root:staff_r:staff_t:s0-s15:c0.c1023
tcontext=system_u:object_r:auditd_log_t:s15:c0.c1023 tclass=file
[root@hugo audit]# ausearch -ts recent -i -m AVC -c ausearch
----
type=PATH msg=audit(07/23/2008 17:18:44.292:1620) : item=0
name=/etc/audit/auditd.conf inode=21112 dev=fd:00 mode=file,640
ouid=root ogid=root rdev=00:00
obj=system_u:object_r:auditd_etc_t:s15:c0.c1023
type=CWD msg=audit(07/23/2008 17:18:44.292:1620) : cwd=/var/log/audit
type=SYSCALL msg=audit(07/23/2008 17:18:44.292:1620) : arch=x86_64
syscall=open success=yes exit=3 a0=40f9d3 a1=20000 a2=c9c140
a3=3e2bf67a70 items=1 ppid=3451 pid=4033 auid=root uid=root gid=root
euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0
ses=1 comm=ausearch exe=/sbin/ausearch
subj=root:staff_r:staff_t:s0-s15:c0.c1023 key=(null)
type=AVC msg=audit(07/23/2008 17:18:44.292:1620) : avc: denied
{ read } for pid=4033 comm=ausearch name=auditd.conf dev=dm-0 ino=21112
scontext=root:staff_r:staff_t:s0-s15:c0.c1023
tcontext=system_u:object_r:auditd_etc_t:s15:c0.c1023 tclass=file
----
type=PATH msg=audit(07/23/2008 17:18:44.292:1622) : item=0
name=/var/log/audit/audit.log inode=24698 dev=fd:00 mode=file,600
ouid=root ogid=root rdev=00:00
obj=system_u:object_r:auditd_log_t:s15:c0.c1023
type=CWD msg=audit(07/23/2008 17:18:44.292:1622) : cwd=/var/log/audit
type=SYSCALL msg=audit(07/23/2008 17:18:44.292:1622) : arch=x86_64
syscall=open success=yes exit=4 a0=7fff89bcdefb a1=0 a2=3e2bf67a60
a3=3e2bf67a58 items=1 ppid=3451 pid=4033 auid=root uid=root gid=root
euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0
ses=1 comm=ausearch exe=/sbin/ausearch
subj=root:staff_r:staff_t:s0-s15:c0.c1023 key=(null)
type=AVC msg=audit(07/23/2008 17:18:44.292:1622) : avc: denied
{ read } for pid=4033 comm=ausearch name=audit.log dev=dm-0 ino=24698
scontext=root:staff_r:staff_t:s0-s15:c0.c1023
tcontext=system_u:object_r:auditd_log_t:s15:c0.c1023 tclass=file
I've got:
audit-1.7.4-1
selinux-policy-mls-3.3.1-77.fc9.noarch
So my questions are:
1: duplicate records above - expected or correct since there were two
matches - the AVC and also the command?
2: why is ausearch producing the AVCs?
Thx,
LCB.
--
LC (Lenny) Bruzenak
lenny@magitekltd.com
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: ausearch / policy question
2008-07-23 22:30 LC Bruzenak
@ 2008-07-24 19:12 ` Steve Grubb
0 siblings, 0 replies; 6+ messages in thread
From: Steve Grubb @ 2008-07-24 19:12 UTC (permalink / raw)
To: linux-audit
On Wednesday 23 July 2008 18:30:45 LC Bruzenak wrote:
> So my questions are:
> 1: duplicate records above - expected or correct since there were two
> matches - the AVC and also the command?
you'd have to look at the logs to figure that out. ausearch doesn't buffer
events past one miscompare.
> 2: why is ausearch producing the AVCs?
Maybe you need to be secadmin or auditadmin?
-Steve
^ permalink raw reply [flat|nested] 6+ messages in thread
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2008-07-25 6:27 ausearch / policy question Cai Xianchao
2008-07-25 17:36 ` LC Bruzenak
2008-07-29 9:30 ` Cai Xianchao
2008-07-29 14:36 ` LC Bruzenak
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2008-07-23 22:30 LC Bruzenak
2008-07-24 19:12 ` Steve Grubb
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