Re: filename not audited for openat() on F28

On 04/20/18 15:37, Steve Grubb wrote: > On Friday, April 20, 2018 9:20:29 AM EDT Jiri Jaburek wrote: >> (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=72756E636F6E0073746166665F753A6C7370705F746573745F723A6C737070 >> 5F7 >> 46573745F67656E657269635F743A53797374656D4869676800646F5F6F70656E617400 >> 2F74 >> 6D7000746D702E30674C74574A336977622F6E6577006372656174650073746166665F7 >> 53A6 F626A6563745F723A757365725F746D705F743A53 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 > > This record says you were denied create. That means it can report the > parent object and its properties. But it cannot report on the object > being created because it has no properties except an intended name. But > it has no device, inode, owner, label, etc. If the system were in > permissive mode, you will probably get the actual object and its > properties. Thanks, however I don't know if the reply was to openat() or creat()

and I also don't know if it's an expected change compared to RHEL-7 or if I should treat it as bug.

>> ---- >> >> but the lack of "/new" in PATH here seems more like a bug. >> >> Thanks, >> Jiri >> >> -- >> Linux-audit mailing list >> Linux-audit(a)redhat.com >> https://www.redhat.com/mailman/listinfo/linux-audit