Re: [RFC PATCH ghak32 V2 00/13] audit: implement container id

[Steve Grubb <sgrubb-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

On Friday, March 16, 2018 5:00:27 AM EDT Richard Guy Briggs wrote:
> Implement audit kernel container ID.
> 
> This patchset is a second RFC based on the proposal document (V3)
> posted:
> 	https://www.redhat.com/archives/linux-audit/2018-January/msg00014.html

So, if you work on a container orchestrator, how exactly is this set of 
interfaces to be used and in what order?

Thanks,
-Steve

> The first patch implements the proc fs write to set the audit container
> ID of a process, emitting an AUDIT_CONTAINER record to announce the
> registration of that container ID on that process.  This patch requires
> userspace support for record acceptance and proper type display.
> 
> The second checks for children or co-threads and refuses to set the
> container ID if either are present.  (This policy could be changed to
> set both with the same container ID provided they meet the rest of the
> requirements.)
> 
> The third implements the auxiliary record AUDIT_CONTAINER_INFO if a
> container ID is identifiable with an event.  This patch requires
> userspace support for proper type display.
> 
> The fourth adds container ID filtering to the exit, exclude and user
> lists.  This patch requires auditctil userspace support for the
> --containerid option.
> 
> The 5th adds signal and ptrace support.
> 
> The 6th creates a local audit context to be able to bind a standalone
> record with a locally created auxiliary record.
> 
> The 7th, 8th, 9th, 10th patches add container ID records to standalone
> records.  Some of these may end up being syscall auxiliary records and
> won't need this specific support since they'll be supported via
> syscalls.
> 
> The 11th adds network namespace container ID labelling based on member
> tasks' container ID labels.
> 
> The 12th adds container ID support to standalone netfilter records that
> don't have a task context and lists each container to which that net
> namespace belongs.
> 
> The 13th implements reading the container ID from the proc filesystem
> for debugging.  This patch isn't planned for upstream inclusion.
> 
> Feedback please!
> 
> Example: Set a container ID of 123456 to the "sleep" task:
> 	sleep 2&
> 	child=$!
> 	echo 123456 > /proc/$child/containerid; echo $?
> 	ausearch -ts recent -m container
> 	echo child:$child contid:$( cat /proc/$child/containerid)
> This should produce a record such as:
> 	type=CONTAINER msg=audit(1521122590.315:222): op=set pid=689 uid=0
> subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 auid=0 tty=pts0
> ses=3 opid=707 old-contid=18446744073709551615 contid=123456 res=1
> 
> Example: Set a filter on a container ID 123459 on /tmp/tmpcontainerid:
> 	containerid=123459
> 	key=tmpcontainerid
> 	auditctl -a exit,always -F dir=/tmp -F perm=wa -F containerid=$containerid
> -F key=$key perl -e "sleep 1; open(my \$tmpfile, '>', \"/tmp/$key\");
> close(\$tmpfile);" & child=$!
> 	echo $containerid > /proc/$child/containerid
> 	sleep 2
> 	ausearch -i -ts recent -k $key
> 	auditctl -d exit,always -F dir=/tmp -F perm=wa -F containerid=$containerid
> -F key=$key rm -f /tmp/$key
> This should produce an event such as:
> 	type=CONTAINER_INFO msg=audit(1521122591.614:227): op=task contid=123459
> 	type=PROCTITLE msg=audit(1521122591.614:227):
> proctitle=7065726C002D6500736C65657020313B206F70656E286D792024746D7066696C
> 652C20273E272C20222F746D702F746D70636F6E7461696E6572696422293B20636C6F73652
> 824746D7066696C65293B type=PATH msg=audit(1521122591.614:227): item=1
> name="/tmp/tmpcontainerid" inode=18427 dev=00:26 mode=0100644 ouid=0
> ogid=0 rdev=00:00 obj=unconfined_u:object_r:user_tmp_t:s0 nametype=CREATE
> cap_fp=0000000000000000 cap_fi=0000000000000000 cap_fe=0 cap_fver=0
> type=PATH msg=audit(1521122591.614:227): item=0 name="/tmp/" inode=13513
> dev=00:26 mode=041777 ouid=0 ogid=0 rdev=00:00
> obj=system_u:object_r:tmp_t:s0 nametype=PARENT cap_fp=0000000000000000
> cap_fi=0000000000000000 cap_fe=0 cap_fver=0 type=CWD
> msg=audit(1521122591.614:227): cwd="/root"
> 	type=SYSCALL msg=audit(1521122591.614:227): arch=c000003e syscall=257
> success=yes exit=3 a0=ffffffffffffff9c a1=55db90a28900 a2=241 a3=1b6
> items=2 ppid=689 pid=724 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
> sgid=0 fsgid=0 tty=pts0 ses=3 comm="perl" exe="/usr/bin/perl"
> subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
> key="tmpcontainerid"
> 
> See:
> 	https://github.com/linux-audit/audit-kernel/issues/32
> 	https://github.com/linux-audit/audit-userspace/issues/40
> 	https://github.com/linux-audit/audit-testsuite/issues/64
> 
> Richard Guy Briggs (13):
>   audit: add container id
>   audit: check children and threading before allowing containerid
>   audit: log container info of syscalls
>   audit: add containerid filtering
>   audit: add containerid support for ptrace and signals
>   audit: add support for non-syscall auxiliary records
>   audit: add container aux record to watch/tree/mark
>   audit: add containerid support for tty_audit
>   audit: add containerid support for config/feature/user records
>   audit: add containerid support for seccomp and anom_abend records
>   audit: add support for containerid to network namespaces
>   audit: NETFILTER_PKT: record each container ID associated with a netNS
>   debug audit: read container ID of a process
> 
>  drivers/tty/tty_audit.c     |   5 +-
>  fs/proc/base.c              |  53 ++++++++++++++++
>  include/linux/audit.h       |  43 +++++++++++++
>  include/linux/init_task.h   |   4 +-
>  include/linux/sched.h       |   1 +
>  include/net/net_namespace.h |  12 ++++
>  include/uapi/linux/audit.h  |   8 ++-
>  kernel/audit.c              |  75 ++++++++++++++++++++---
>  kernel/audit.h              |   3 +
>  kernel/audit_fsnotify.c     |   5 +-
>  kernel/audit_tree.c         |   5 +-
>  kernel/audit_watch.c        |  33 +++++-----
>  kernel/auditfilter.c        |  52 +++++++++++++++-
>  kernel/auditsc.c            | 145
> ++++++++++++++++++++++++++++++++++++++++++-- kernel/nsproxy.c            |
>   6 ++
>  net/core/net_namespace.c    |  45 ++++++++++++++
>  net/netfilter/xt_AUDIT.c    |  15 ++++-
>  17 files changed, 473 insertions(+), 37 deletions(-)