filename not audited for openat() on F28

[Jiri Jaburek]

(Please CC me on replies.)

Hello,
I'm trying to run the audit-test suite on Fedora 28 and am running into
it expecting a name= field in the SYSCALL entry.

augrok --seek=697600 -m1 type==SYSCALL         syscall=openat success=no
pid=3951 auid=1000         uid=0 euid=0 suid=0 fsuid=0         gid=0
egid=0 sgid=0 fsgid=0 exit=-13
subj=staff_u:lspp_test_r:lspp_test_generic_t:SystemHigh
name=tmp.owfFtgPOjx/new

Fedora 28:

----
time->Fri Apr 20 15:04:59 2018
type=PROCTITLE msg=audit(1524229499.918:366591):
proctitle=2F62696E2F62617368002E2F72756E2E62617368002D647600323734
type=PATH msg=audit(1524229499.918:366591): item=0
name="tmp.J4IQL7Buxe/" inode=1055495 dev=fd:02 mode=040700 ouid=0 ogid=0
rdev=00:00 obj=staff_u:object_r:user_tmp_t:s15:c0.c1023 nametype=PARENT
cap_fp=0000000000000000 cap_fi=0000000000000000 cap_fe=0 cap_fver=0
type=CWD msg=audit(1524229499.918:366591):
cwd="/usr/local/eal4_testing/audit-test/syscalls"
type=SYSCALL msg=audit(1524229499.918:366591): arch=c000003e syscall=257
success=no exit=-13 a0=3 a1=7ffc02f0eaf6 a2=c0 a3=16b6010 items=1
ppid=5275 pid=5276 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
sgid=0 fsgid=0 tty=(none) ses=2 comm="do_openat"
exe="/usr/local/eal4_testing/audit-test/utils/bin/do_openat"
subj=staff_u:lspp_test_r:lspp_test_generic_t:s15:c0.c1023 key=(null)
type=AVC msg=audit(1524229499.918:366591): avc:  denied  { create } for
pid=5276 comm="do_openat" name="new"
scontext=staff_u:lspp_test_r:lspp_test_generic_t:s15:c0.c1023
tcontext=staff_u:object_r:user_tmp_t:s0 tclass=file permissive=0
----

RHEL-7.5:

----
time->Fri Apr 20 15:06:59 2018
type=PROCTITLE msg=audit(1524229619.726:56605):
proctitle=72756E636F6E0073746166665F753A6C7370705F746573745F723A6C7370705F746573745F67656E657269635F743A53797374656D4869676800646F5F6F70656E6174002F746D7000746D702E30674C74574A336977622F6E6577006372656174650073746166665F753A6F626A6563745F723A757365725F746D705F743A53
type=PATH msg=audit(1524229619.726:56605): item=1
name="tmp.0gLtWJ3iwb/new" objtype=CREATE cap_fp=0000000000000000
cap_fi=0000000000000000 cap_fe=0 cap_fver=0
type=PATH msg=audit(1524229619.726:56605): item=0 name="tmp.0gLtWJ3iwb/"
inode=1055489 dev=fd:02 mode=040700 ouid=0 ogid=0 rdev=00:00
obj=staff_u:object_r:user_tmp_t:s15:c0.c1023 objtype=PARENT
cap_fp=0000000000000000 cap_fi=0000000000000000 cap_fe=0 cap_fver=0
type=CWD msg=audit(1524229619.726:56605):
cwd="/usr/local/eal4_testing/audit-test/syscalls"
type=SYSCALL msg=audit(1524229619.726:56605): arch=c000003e syscall=257
success=no exit=-13 a0=3 a1=7ffc1ecd6b57 a2=c0 a3=0 items=2 ppid=20750
pid=20751 auid=1000 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0
fsgid=0 tty=(none) ses=1595 comm="do_openat"
exe="/usr/local/eal4_testing/audit-test/utils/bin/do_openat"
subj=staff_u:lspp_test_r:lspp_test_generic_t:s15:c0.c1023 key=(null)
----

The key difference here is probably the absence of

type=PATH msg=audit(1524229619.726:56605): item=1
name="tmp.0gLtWJ3iwb/new" objtype=CREATE cap_fp=0000000000000000
cap_fi=0000000000000000 cap_fe=0 cap_fver=0

on Fedora 28, which augrok looks for.

Is this expected?



I'm seeing something similar with other syscalls like

creat("/tmp/tmp.9EsMgMuio7/new", 0700)

producing

----
type=PROCTITLE msg=audit(04/20/2018 15:15:35.547:371576) :
proctitle=runcon staff_u:lspp_test_r:lspp_test_generic_t:SystemHigh
do_creat /tmp/tmp.9EsMgMuio7/new staff_u:object_r:user_tmp_t:SystemLow
type=PATH msg=audit(04/20/2018 15:15:35.547:371576) : item=0
name=/tmp/tmp.9EsMgMuio7/ inode=1572964 dev=fd:02 mode=dir,700 ouid=root
ogid=root rdev=00:00 obj=staff_u:object_r:user_tmp_t:s15:c0.c1023
nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0
type=CWD msg=audit(04/20/2018 15:15:35.547:371576) :
cwd=/usr/local/eal4_testing/audit-test/syscalls
type=SYSCALL msg=audit(04/20/2018 15:15:35.547:371576) : arch=x86_64
syscall=creat success=no exit=EACCES(Permission denied)
a0=0x7ffc41d04af9 a1=0700 a2=0x0 a3=0x0 items=1 ppid=6779 pid=6780
auid=eal uid=root gid=root euid=root suid=root fsuid=root egid=root
sgid=root fsgid=root tty=(none) ses=2 comm=do_creat
exe=/usr/local/eal4_testing/audit-test/utils/bin/do_creat
subj=staff_u:lspp_test_r:lspp_test_generic_t:s15:c0.c1023 key=(null)
type=AVC msg=audit(04/20/2018 15:15:35.547:371576) : avc:  denied  {
create } for  pid=6780 comm=do_creat name=new
scontext=staff_u:lspp_test_r:lspp_test_generic_t:s15:c0.c1023
tcontext=staff_u:object_r:user_tmp_t:s0 tclass=file permissive=0
----

but the lack of "/new" in PATH here seems more like a bug.

Thanks,
Jiri