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Re: need rules help



On Thu, 2009-08-06 at 10:10 -0500, LC Bruzenak wrote:
> On Wed, 2009-08-05 at 21:45 -0500, LC Bruzenak wrote:

OK, I'm back with new evidence of a problem after what I think is
correct setup. I put only the subj_type as a comparator even though I
want a more restrictive set. the rule was set with the "-A" flag.

* My rules start with (use "auditctl -l"):

LIST_RULES: entry,always arch=3221225534 (0xc000003e)
syscall=mknod,mknodat
LIST_RULES: entry,always arch=3221225534 (0xc000003e)
syscall=mount,umount2
LIST_RULES: exit,never subj_type=jcdx_mtdb_t syscall=all
...

* I note the date:
Thu Aug  6 20:36:31 UTC 2009

* I search again later (using ausearch) and find:

node=jcdx type=PATH msg=audit(08/06/2009 20:42:20.726:21672) : item=0
name=/var/opt/jcdx/tracks/mltrackdb/PlatformTracks.inst/040fd238ede9dfbbc19e012c7633836f/PlatformTracks 
node=jcdx type=CWD msg=audit(08/06/2009 20:42:20.726:21672) :  cwd=/ 
node=jcdx type=SYSCALL msg=audit(08/06/2009 20:42:20.726:21672) :
arch=i386 syscall=stat64 success=no exit=-2(No such file or directory)
a0=9a4ea40 a1=ffc93644 a2=d2aff4 a3=ffc9377c items=1 ppid=1 pid=23599
auid=root uid=root gid=jcdx euid=root suid=root fsuid=root egid=jcdx
sgid=jcdx fsgid=jcdx tty=(none) ses=8 comm=mtdb exe=/opt/jcdx/sbin/mtdb
subj=system_u:system_r:jcdx_mtdb_t:s0-s6:c0.c511 key=(null) 
node=jcdx type=AVC msg=audit(08/06/2009 20:42:20.726:21672) : avc:
denied  { search } for  pid=23599 comm=mtdb
name=040fd238ede9dfbbc19e012c7633836f dev=dm-0 ino=269567
scontext=system_u:system_r:jcdx_mtdb_t:s0-s6:c0.c511
tcontext=system_u:object_r:jcdx_stdb_var_t:s15:c0.c1023 tclass=dir 


So it appears that the "never" rule is not firing...right? 
I'm not sure if the rule applies to only the info in the "type=syscall"
line. Really I want to compare against the specific scontext/tcontext
pair in the "type=AVC" line. 

Thanks in advance,
LCB.

-- 
LC (Lenny) Bruzenak
lenny magitekltd com


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