From: Richard Guy Briggs <rgb@redhat.com>
To: Paul Moore <paul@paul-moore.com>
Cc: containers@lists.linux-foundation.org, linux-api@vger.kernel.org,
Linux-Audit Mailing List <linux-audit@redhat.com>,
linux-fsdevel@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
netdev@vger.kernel.org, netfilter-devel@vger.kernel.org,
sgrubb@redhat.com, omosnace@redhat.com, dhowells@redhat.com,
simo@redhat.com, Eric Paris <eparis@parisplace.org>,
Serge Hallyn <serge@hallyn.com>,
ebiederm@xmission.com, nhorman@tuxdriver.com,
Dan Walsh <dwalsh@redhat.com>,
mpatel@redhat.com
Subject: Re: [PATCH ghak90 V7 14/21] audit: contid check descendancy and nesting
Date: Thu, 24 Oct 2019 18:08:14 -0400 [thread overview]
Message-ID: <20191024220814.pid5ql6kvyr4ianb@madcap2.tricolour.ca> (raw)
In-Reply-To: <CAHC9VhSRmn46DcazH4Q35vOSxVoEu8PsX79aurkHkFymRoMwag@mail.gmail.com>
On 2019-10-10 20:40, Paul Moore wrote:
> On Wed, Sep 18, 2019 at 9:26 PM Richard Guy Briggs <rgb@redhat.com> wrote:
> > ?fixup! audit: convert to contid list to check for orch/engine ownership
>
> ?
>
> > Require the target task to be a descendant of the container
> > orchestrator/engine.
> >
> > You would only change the audit container ID from one set or inherited
> > value to another if you were nesting containers.
> >
> > If changing the contid, the container orchestrator/engine must be a
> > descendant and not same orchestrator as the one that set it so it is not
> > possible to change the contid of another orchestrator's container.
>
> Did you mean to say that the container orchestrator must be an
> ancestor of the target, and the same orchestrator as the one that set
> the target process' audit container ID?
Not quite, the first half yes, but the second half: if it was already
set by that orchestrator, it can't be set again. If it is a different
orchestrator that is a descendant of the orchestrator that set it, then
allow the action.
> Or maybe I'm missing something about what you are trying to do?
Does that help clarify it?
> > Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
> > ---
> > kernel/audit.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++-------
> > 1 file changed, 62 insertions(+), 8 deletions(-)
> >
> > diff --git a/kernel/audit.c b/kernel/audit.c
> > index 9ce7a1ec7a92..69fe1e9af7cb 100644
> > --- a/kernel/audit.c
> > +++ b/kernel/audit.c
> > @@ -2560,6 +2560,39 @@ static struct task_struct *audit_cont_owner(struct task_struct *tsk)
> > }
> >
> > /*
> > + * task_is_descendant - walk up a process family tree looking for a match
> > + * @parent: the process to compare against while walking up from child
> > + * @child: the process to start from while looking upwards for parent
> > + *
> > + * Returns 1 if child is a descendant of parent, 0 if not.
> > + */
> > +static int task_is_descendant(struct task_struct *parent,
> > + struct task_struct *child)
> > +{
> > + int rc = 0;
> > + struct task_struct *walker = child;
> > +
> > + if (!parent || !child)
> > + return 0;
> > +
> > + rcu_read_lock();
> > + if (!thread_group_leader(parent))
> > + parent = rcu_dereference(parent->group_leader);
> > + while (walker->pid > 0) {
> > + if (!thread_group_leader(walker))
> > + walker = rcu_dereference(walker->group_leader);
> > + if (walker == parent) {
> > + rc = 1;
> > + break;
> > + }
> > + walker = rcu_dereference(walker->real_parent);
> > + }
> > + rcu_read_unlock();
> > +
> > + return rc;
> > +}
> > +
> > +/*
> > * audit_set_contid - set current task's audit contid
> > * @task: target task
> > * @contid: contid value
> > @@ -2587,22 +2620,43 @@ int audit_set_contid(struct task_struct *task, u64 contid)
> > oldcontid = audit_get_contid(task);
> > read_lock(&tasklist_lock);
> > /* Don't allow the contid to be unset */
> > - if (!audit_contid_valid(contid))
> > + if (!audit_contid_valid(contid)) {
> > rc = -EINVAL;
> > + goto unlock;
> > + }
> > /* Don't allow the contid to be set to the same value again */
> > - else if (contid == oldcontid) {
> > + if (contid == oldcontid) {
> > rc = -EADDRINUSE;
> > + goto unlock;
> > + }
> > /* if we don't have caps, reject */
> > - else if (!capable(CAP_AUDIT_CONTROL))
> > + if (!capable(CAP_AUDIT_CONTROL)) {
> > rc = -EPERM;
> > - /* if task has children or is not single-threaded, deny */
> > - else if (!list_empty(&task->children))
> > + goto unlock;
> > + }
> > + /* if task has children, deny */
> > + if (!list_empty(&task->children)) {
> > rc = -EBUSY;
> > - else if (!(thread_group_leader(task) && thread_group_empty(task)))
> > + goto unlock;
> > + }
> > + /* if task is not single-threaded, deny */
> > + if (!(thread_group_leader(task) && thread_group_empty(task))) {
> > rc = -EALREADY;
> > - /* if contid is already set, deny */
> > - else if (audit_contid_set(task))
> > + goto unlock;
> > + }
> > + /* if task is not descendant, block */
> > + if (task == current) {
> > + rc = -EBADSLT;
> > + goto unlock;
> > + }
> > + if (!task_is_descendant(current, task)) {
> > + rc = -EXDEV;
> > + goto unlock;
> > + }
> > + /* only allow contid setting again if nesting */
> > + if (audit_contid_set(task) && current == audit_cont_owner(task))
> > rc = -ECHILD;
> > +unlock:
> > read_unlock(&tasklist_lock);
> > if (!rc) {
> > struct audit_cont *oldcont = audit_cont(task);
>
> --
> paul moore
> www.paul-moore.com
- RGB
--
Richard Guy Briggs <rgb@redhat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635
next prev parent reply other threads:[~2019-10-24 22:08 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-19 1:22 [PATCH ghak90 V7 00/21] audit: implement container identifier Richard Guy Briggs
2019-09-19 1:22 ` [PATCH ghak90 V7 01/21] audit: collect audit task parameters Richard Guy Briggs
2019-09-19 1:22 ` [PATCH ghak90 V7 02/21] audit: add container id Richard Guy Briggs
2019-09-19 1:22 ` [PATCH ghak90 V7 03/21] audit: read container ID of a process Richard Guy Briggs
2019-09-19 1:22 ` [PATCH ghak90 V7 04/21] audit: convert to contid list to check for orch/engine ownership Richard Guy Briggs
2019-09-26 14:46 ` Neil Horman
2019-10-25 20:00 ` Richard Guy Briggs
2019-10-28 12:20 ` Neil Horman
2019-10-11 0:38 ` Paul Moore
2019-10-25 21:00 ` Richard Guy Briggs
2019-11-08 18:26 ` Paul Moore
2019-09-19 1:22 ` [PATCH ghak90 V7 05/21] audit: log drop of contid on exit of last task Richard Guy Briggs
2019-10-11 0:38 ` Paul Moore
2019-10-25 19:43 ` Richard Guy Briggs
2019-09-19 1:22 ` [PATCH ghak90 V7 06/21] audit: contid limit of 32k imposed to avoid DoS Richard Guy Briggs
2019-09-27 12:51 ` Neil Horman
2019-10-11 0:38 ` Paul Moore
2019-10-24 21:23 ` Richard Guy Briggs
2019-11-08 17:49 ` Paul Moore
2019-12-17 18:45 ` Richard Guy Briggs
2019-12-17 19:25 ` Steve Grubb
2019-12-17 19:56 ` Richard Guy Briggs
2019-10-25 20:15 ` Richard Guy Briggs
2019-09-19 1:22 ` [PATCH ghak90 V7 07/21] audit: log container info of syscalls Richard Guy Briggs
2019-09-19 1:22 ` [PATCH ghak90 V7 08/21] audit: add contid support for signalling the audit daemon Richard Guy Briggs
2019-10-11 0:39 ` Paul Moore
2019-10-25 19:20 ` Richard Guy Briggs
2019-11-08 17:41 ` Paul Moore
2019-09-19 1:22 ` [PATCH ghak90 V7 09/21] audit: add support for non-syscall auxiliary records Richard Guy Briggs
2019-09-19 1:22 ` [PATCH ghak90 V7 10/21] audit: add containerid support for user records Richard Guy Briggs
2019-09-19 1:22 ` [PATCH ghak90 V7 11/21] audit: add containerid filtering Richard Guy Briggs
2019-09-19 1:22 ` [PATCH ghak90 V7 12/21] audit: add support for containerid to network namespaces Richard Guy Briggs
2019-10-11 0:39 ` Paul Moore
2019-09-19 1:22 ` [PATCH ghak90 V7 13/21] audit: NETFILTER_PKT: record each container ID associated with a netNS Richard Guy Briggs
2019-10-11 0:39 ` Paul Moore
2019-09-19 1:22 ` [PATCH ghak90 V7 14/21] audit: contid check descendancy and nesting Richard Guy Briggs
2019-10-11 0:40 ` Paul Moore
2019-10-24 22:08 ` Richard Guy Briggs [this message]
2019-10-30 20:32 ` Paul Moore
2019-09-19 1:22 ` [PATCH ghak90 V7 15/21] sched: pull task_is_descendant into kernel/sched/core.c Richard Guy Briggs
2019-10-11 0:40 ` Paul Moore
2019-09-19 1:22 ` [PATCH ghak90 V7 16/21] audit: add support for contid set/get by netlink Richard Guy Briggs
2019-10-11 0:40 ` Paul Moore
2019-09-19 1:22 ` [PATCH ghak90 V7 17/21] audit: add support for loginuid/sessionid " Richard Guy Briggs
2019-10-11 0:40 ` Paul Moore
2019-09-19 1:22 ` [PATCH ghak90 V7 18/21] audit: track container nesting Richard Guy Briggs
2019-10-11 0:40 ` Paul Moore
2019-09-19 1:22 ` [PATCH ghak90 V7 19/21] audit: check cont depth Richard Guy Briggs
2019-09-19 1:22 ` [PATCH ghak90 V7 20/21] audit: add capcontid to set contid outside init_user_ns Richard Guy Briggs
2019-10-19 1:39 ` Richard Guy Briggs
2019-10-21 19:53 ` Paul Moore
2019-10-21 21:38 ` Richard Guy Briggs
2019-10-21 21:43 ` Paul Moore
2019-10-21 23:57 ` Richard Guy Briggs
2019-10-22 0:31 ` Paul Moore
2019-10-22 12:13 ` Neil Horman
2019-10-22 14:04 ` Paul Moore
2019-10-22 20:06 ` Richard Guy Briggs
2019-10-22 14:27 ` Richard Guy Briggs
2019-10-22 14:34 ` Paul Moore
2019-10-24 21:00 ` Richard Guy Briggs
2019-10-30 20:27 ` Paul Moore
2019-10-30 22:03 ` Richard Guy Briggs
2019-10-31 13:59 ` Paul Moore
2019-10-31 14:50 ` Steve Grubb
2019-10-31 23:37 ` Paul Moore
2019-11-01 1:02 ` Duncan Roe
2019-11-01 15:09 ` Richard Guy Briggs
2019-11-01 15:13 ` Steve Grubb
2019-11-01 15:21 ` Richard Guy Briggs
2019-11-01 16:22 ` Paul Moore
2019-09-19 1:22 ` [PATCH ghak90 V7 21/21] audit: add proc interface for capcontid Richard Guy Briggs
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