[PATCH v2 0/2] RFC, aiding pid/network correlation

[Peter Moody <pmoody@google.com>]

I'm interested in having a host-based monitoring mechanism in
place in the linux kernel. At this point I'm specifically looking
to tie any given packet seen on the network back to the process
that sent or received it. This is the sort of information our
incident responders are constantly asking for.

This is round 2 of the patchset. It's essentially taking HONE [1],
a kernel module originally written by Brandon Carpenter and switches
the hooks to use the standard (plus a new one, task_post_create) LSM
hooks + a run through cleanfile/checkpatch.

At a high level, Hone hooks process/socket creations/terminations
and inet/inet6 packets that are sent or received. A userspace
application can then correlate packet to process by reading the
events from the kernel.

(Note, there doesn't appear to be outbound version of the callback
socket_sock_rcv_skb and the socket_sendmsg/socket_recvmsg
are called too early in the process to be used so this uses netfilter
hooks.)

This patchset makes the events available as text via securityfs
in /sys/kernel/security/hone/text and /sys/kernel/security/hone/pcapng.
The text output looks like

3.350826817 EXEC 718 1 0 0 "/usr/sbin/cupsd" /usr/sbin/cupsd -f
3.350826817 SOCK O 718 1 0 0 b14e0000
...
5301.871561546 EXEC 2652 2586 1000 1000 "/bin/less" less
5303.104510870 EXEC 2653 2651 0 0 "/bin/cat" cat /sys/kernel/security/hone/text
5303.110322648 PAKT O 382d0700 2524 TCPv4 169.254.0.11:22 -> 169.254.0.2:49387 120

and the pcapng format is described in hone_pcapng.h.

There are some drawbacks with this method. Notably, it doesn't
accurately track the owning pid of sockets passed via dup(), dup2()
etc.

This particular approach is all very experimental. We had a need
for this level of monitoring on some of our machines (did I mention
the incident responders?) and HONE had the best features/efficiency.

I've CC'd the netdev folks at James' suggestion. I CC'd you, Casey
as you were the one who suggested this be a proper LSM.

So I'm humbly requesting comments.

 * Is there a better (more efficient/extensible) way to do this?
 * Is there already an existing mechanism to do this?
 * Is there any interest in something like this living in the
   kernel? Or is the dkms distributed path the way to go?

And if this is all reasonable, is it possible to add a
socket_sock_send_skb callback and where might that go?

Finally, the linux-sensor project was released under the GPL but
I'm not sure if there are any copyright issues ... ? I've just
kept the copyright comments in any event.

This has been tested against security-next

[1] https://github.com/HoneProject/Linux-Sensor

Peter Moody (2):
  security: create task_post_create callback.
  security: Hone LSM

 include/linux/hone.h               |  50 +++
 include/linux/security.h           |   8 +
 kernel/fork.c                      |   1 +
 security/Kconfig                   |   1 +
 security/Makefile                  |   2 +
 security/capability.c              |   5 +
 security/hone/Kconfig              |   8 +
 security/hone/Makefile             |   3 +
 security/hone/hone.h               | 164 ++++++++++
 security/hone/hone_event.c         | 625 +++++++++++++++++++++++++++++++++++++
 security/hone/hone_lsm.c           | 183 +++++++++++
 security/hone/hone_mmutil.c        | 106 +++++++
 security/hone/hone_mmutil.h        |  20 ++
 security/hone/hone_notify.c        | 450 ++++++++++++++++++++++++++
 security/hone/hone_pcapng.c        | 596 +++++++++++++++++++++++++++++++++++
 security/hone/hone_pcapng.h        |  30 ++
 security/hone/hone_ringbuf.c       |  51 +++
 security/hone/hone_ringbuf.h       |  34 ++
 security/hone/hone_socket_lookup.c | 264 ++++++++++++++++
 security/security.c                |   5 +
 20 files changed, 2606 insertions(+)
 create mode 100644 include/linux/hone.h
 create mode 100644 security/hone/Kconfig
 create mode 100644 security/hone/Makefile
 create mode 100644 security/hone/hone.h
 create mode 100644 security/hone/hone_event.c
 create mode 100644 security/hone/hone_lsm.c
 create mode 100644 security/hone/hone_mmutil.c
 create mode 100644 security/hone/hone_mmutil.h
 create mode 100644 security/hone/hone_notify.c
 create mode 100644 security/hone/hone_pcapng.c
 create mode 100644 security/hone/hone_pcapng.h
 create mode 100644 security/hone/hone_ringbuf.c
 create mode 100644 security/hone/hone_ringbuf.h
 create mode 100644 security/hone/hone_socket_lookup.c

-- 
2.0.0.526.g5318336