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RE: Path ignored but syscall event still logged



Hi Steve,

There are no mount points anywhere in that path apart from at the top level. I'm 99% sure there were no sym links either but that path has since been removed so I can't be completely sure.

To make things a bit simpler I can reproduce it with a much shorter path and definitely no sym links within the path:

 

[root hostb001 ~]# auditctl -l

LIST_RULES: exit,always dir=/etc/audit (0xa) perm=wa key=auditd_configuration

LIST_RULES: exit,always dir=/etc/audisp (0xb) perm=wa key=auditd_configuration

LIST_RULES: exit,always watch=/etc/libaudit.conf perm=wa key=auditd_configuration

LIST_RULES: exit,always watch=/etc/sysconfig/auditd perm=wa key=auditd_configuration

LIST_RULES: exit,never dir=/etc/lvm/cache (0xe) syscall=all

LIST_RULES: exit,never dir=/opt (0x4) syscall=all

LIST_RULES: exit,never dir=/tmp (0x4) syscall=all

LIST_RULES: exit,never dir=/naab1 (0x6) syscall=all

LIST_RULES: exit,never dir=/naab2 (0x6) syscall=all

LIST_RULES: exit,never dir=/ab1 (0x4) syscall=all

LIST_RULES: exit,never dir=/ab2 (0x4) syscall=all

LIST_RULES: exit,never dir=/usr/openv/netbackup (0x14) syscall=all

LIST_RULES: exit,always perm=a key=file_attributes

LIST_RULES: exit,always arch=3221225534 (0xc000003e) a1=1074292226 (0x40086602) key=file_attributes syscall=ioctl

LIST_RULES: exit,always arch=3221225534 (0xc000003e) a1=-2146933247 (0x80086601) key=file_attributes syscall=ioctl

LIST_RULES: exit,always arch=3221225534 (0xc000003e) exit=-13 (0xfffffff3) key=invalid_logical_access syscall=open

LIST_RULES: exit,always dir=/bin (0x4) perm=wa key=bin_modification

LIST_RULES: exit,always dir=/boot (0x5) perm=wa key=boot_modification

LIST_RULES: exit,always dir=/etc (0x4) perm=wa key=etc_modification

LIST_RULES: exit,always dir=/home (0x5) perm=wa key=home_modification

LIST_RULES: exit,always dir=/lib (0x4) perm=wa key=lib_modification

LIST_RULES: exit,always dir=/lib64 (0x6) perm=wa key=lib64_modification

LIST_RULES: exit,always dir=/root (0x5) perm=wa key=root_modification

LIST_RULES: exit,always dir=/sbin (0x5) perm=wa key=sbin_modification

LIST_RULES: exit,always dir=/usr (0x4) perm=wa key=usr_modification

LIST_RULES: exit,always dir=/var/spool/at (0xd) perm=wa key=misc_var

LIST_RULES: exit,always dir=/var/spool/cron (0xf) perm=wa key=misc_var

LIST_RULES: exit,never dir=/var (0x4) syscall=all

LIST_RULES: exit,always arch=3221225534 (0xc000003e) key=dir_operations syscall=mkdir,rmdir,unlinkat

LIST_RULES: exit,always arch=3221225534 (0xc000003e) key=link_operation syscall=rename,link,unlink,symlink

LIST_RULES: exit,always arch=3221225534 (0xc000003e) key=special_device_creation syscall=mknod,mknodat

LIST_RULES: exit,always arch=3221225534 (0xc000003e) key=mount_operation syscall=mount,umount2

LIST_RULES: exit,always arch=3221225534 (0xc000003e) key=kernel_module syscall=create_module,init_module,delete_module

LIST_RULES: exclude,always msgtype=CRED_ACQ (0x44f)

LIST_RULES: exclude,always msgtype=CRED_DISP (0x450)

LIST_RULES: exclude,always msgtype=CRYPTO_KEY_USER (0x964)

LIST_RULES: exclude,always msgtype=CRYPTO_SESSION (0x967)

LIST_RULES: exclude,always msgtype=LOGIN (0x3ee)

LIST_RULES: exclude,always msgtype=USER_ACCT (0x44d)

LIST_RULES: exclude,always msgtype=USER_AUTH (0x44c)

LIST_RULES: exclude,always msgtype=USER_CMD (0x463)

LIST_RULES: exclude,always msgtype=USER_END (0x452)

LIST_RULES: exclude,always msgtype=USER_LOGIN (0x458)

LIST_RULES: exclude,always msgtype=USER_START (0x451)

[root hostb001 ~]#

[root hostb001 ~]# mount|grep naab1

/dev/mapper/VolGroupB01-abb_landing on /naab1 type ext4 (rw)

[root hostb001 ~]#

[root hostb001 ~]# ls -l /|grep naab1

lrwxrwxrwx    1 root     root               6 Jun  6  2011 ab1 -> /naab1

drwxr-x---    6 app app_users  4096 Aug 23 13:23 naab1

[root hostb001 ~]#

[root hostb001 ~]# touch /naab1/temp-file

[root hostb001 ~]# chmod 600 /naab1/temp-file

[root hostb001 ~]#

[root hostb001 ~]# tail -3 /var/log/audit/audit.log

node=hostb001.domain type=SYSCALL msg=audit(1326711394.421:3737872): arch=c000003e syscall=268 success=yes exit=0 a0=ffffffffffffff9c a1=60d1d0 a2=180 a3=0 items=1 ppid=20688 pid=32510 auid=7382 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=49941 comm="chmod" exe="/bin/chmod" key="file_attributes"

node=hostb001.domain type=CWD msg=audit(1326711394.421:3737872):  cwd="/root"

node=hostb001.domain type=PATH msg=audit(1326711394.421:3737872): item=0 name="/naab1/temp-file" inode=12 dev=fd:0d mode=0100600 ouid=0 ogid=0 rdev=00:00

[root hostb001 ~]#

 

Does this make it a bit clearer? I look forward to your reply.

Many thanks,

Max

 

-----Original Message-----
From: Steve Grubb [mailto:sgrubb redhat com]
Sent: 13 January 2012 18:52
To: linux-audit redhat com
Cc: Max Williams
Subject: Re: Path ignored but syscall event still logged

 

On Friday, January 13, 2012 11:46:58 AM Max Williams wrote:

> Hi Steve,

> Thanks for the reply. Yes and yes:

>

> [root host1 ~]# mount|grep ab

> /dev/mapper/VolGroupCF00-abf_graph on /naab2 type ext4 (rw)

> /dev/mapper/VolGroupCF01-abf_icff on /naab1 type ext4 (rw)

>

> [root host1 ~]# ll /|grep ab

> lrwxrwxrwx    1 root root               6 May  9  2011 ab1 -> /naab1

> lrwxrwxrwx    1 root root               6 May  9  2011 ab2 -> /naab2

> drwxrwx---    5 root ab_users  4096 May 20  2011 naab1

> drwxrwx---    6 root ab_users  4096 Jun 29  2011 naab2

> [root host1 ~]#

>

> How does that affect the the rule, which was for the actual mount

> point, not the sym link? LIST_RULES: exit,never dir=/naab1 (0x6)

> syscall=all

 

Its OK for the top level dir to be a mount point. However, what about everything under it?

 

/naab1/serial/data/dir1/serial/dir2/abc_load/temp/some-app/.WORK-serial/1568280a-4eef7e3f-3873

 

Could data or dir1 be a mount point?  If anything under /naab1 is a mount point, then you have to tell the kernel to treat it as equivalent to the parent dir that you have the rule on. For example, suppose data was in fact a moint point and you mounted /dev/sda1 onto it. You would need to add the follwoing to your audit rules:

 

-q  /naab1/serial/data,/dev/sda1

 

As for symlinks, I'm not sure that a recursive watch will follow the symlink. If for example, some-app was a symlink to /opt/some-app, I am pretty sure the watch will not follow over to the other device.

You would have to add a watch on /opt/some-app to get events.

 

The same thing applies for suppressing events.

 

-Steve

 

 

> -----Original Message-----

> From: Steve Grubb [mailto:sgrubb redhat com]

> Sent: 13 January 2012 14:46

> To: linux-audit redhat com

> Cc: Max Williams

> Subject: Re: Path ignored but syscall event still logged

>

> On Thursday, January 12, 2012 09:45:59 AM Max Williams wrote:

> > Sorry to bug you but is this issue I'm having a bug or have I made a

> > mistake in the rules? Is there another way I could exclude this

> > directory from auditd?

>

> Looking back at the original...

>

> /naab1/serial/data/dir1/serial/dir2/abc_load/temp/some-app/.WORK-

> serial/1568280a-4eef7e3f-3873

>

> Are there any mount points in that path? Or any symlinks pointing to

> other disk devices?

>

> Thanks,

> -Steve

>

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