linux-kernel - Re: [PATCH v13 5/9] LSM: Networking component isolation

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Date:	Wed, 24 Apr 2013 17:04:42 -0400
From:	Paul Moore <paul@...l-moore.com>
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	LSM <linux-security-module@...r.kernel.org>,
	LKLM <linux-kernel@...r.kernel.org>,
	SE Linux <selinux@...ho.nsa.gov>,
	James Morris <jmorris@...ei.org>,
	John Johansen <john.johansen@...onical.com>,
	Eric Paris <eparis@...hat.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v13 5/9] LSM: Networking component isolation

On Wednesday, April 24, 2013 12:09:50 PM Casey Schaufler wrote:
> On 4/24/2013 11:51 AM, Paul Moore wrote:
> > On Tuesday, April 23, 2013 09:04:31 AM Casey Schaufler wrote:
> >> Subject: [PATCH v13 5/9] LSM: Networking component isolation
> >> 
> >> The NetLabel, XFRM and secmark networking mechanisms are
> >> limited to providing security information managed by one
> >> LSM. These changes interface the single LSM networking
> >> components with the multiple LSM system. Each of the
> >> networking components will identify the security ops
> >> vector of the LSM that will use it. There are various
> >> wrapper functions provided to make this obvious and
> >> painless.
> >> 
> >> Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
> > 
> > ...
> >
> >> diff --git a/net/netlabel/netlabel_user.h b/net/netlabel/netlabel_user.h
> >> index a6f1705..9990b24 100644
> >> --- a/net/netlabel/netlabel_user.h
> >> +++ b/net/netlabel/netlabel_user.h
> >> @@ -41,6 +41,65 @@
> >> 
> >>  /* NetLabel NETLINK helper functions */
> >> 
> >> +extern struct security_operations *netlbl_active_lsm;
> >> +
> >> +/**
> >> + * netlbl_secid_to_secctx - call the registered secid_to_secctx LSM hook
> >> + * @secid - The secid to convert
> >> + * @secdata - Where to put the result
> >> + * @seclen - Where to put the length of the result
> >> + *
> >> + * Returns: the result of calling the hook.
> >> + */
> >> +static inline int netlbl_secid_to_secctx(u32 secid, char **secdata, u32
> >> *seclen) +{
> >> +	if (netlbl_active_lsm == NULL)
> >> +		return -EINVAL;
> >> +	return netlbl_active_lsm->secid_to_secctx(secid, secdata, seclen);
> >> +}
> >> +
> >> +/**
> >> + * netlbl_release_secctx - call the registered release_secctx LSM hook
> >> + * @secdata - The security context to release
> >> + * @seclen - The size of the context to release
> >> + *
> >> + */
> >> +static inline void netlbl_release_secctx(char *secdata, u32 seclen)
> >> +{
> >> +	if (netlbl_active_lsm != NULL)
> >> +		netlbl_active_lsm->release_secctx(secdata, seclen);
> >> +}
> >> +
> >> +/**
> >> + * netlbl_secctx_to_secid - call the registered seccts_to_secid LSM hook
> >> + * @secdata - The security context
> >> + * @seclen - The size of the security context
> >> + * @secid - Where to put the result
> >> + *
> >> + * Returns: the result of calling the hook
> >> + */
> >> +static inline int netlbl_secctx_to_secid(const char *secdata, u32
> >> seclen,
> >> +					 u32 *secid)
> >> +{
> >> +	if (netlbl_active_lsm == NULL) {
> >> +		*secid = 0;
> >> +		return -EINVAL;
> >> +	}
> >> +	return netlbl_active_lsm->secctx_to_secid(secdata, seclen, secid);
> >> +}
> >> +
> >> +/**
> >> + * netlbl_task_getsecid - call the registered task_getsecid LSM hook
> >> + * @p - The task
> >> + * @secid - Where to put the secid
> >> + *
> >> + */
> >> +static inline void netlbl_task_getsecid(struct task_struct *p, u32
> >> *secid)
> >> +{
> >> +	if (netlbl_active_lsm)
> >> +		netlbl_active_lsm->task_getsecid(p, secid);
> >> +}
> > 
> > Any particular reason you put all these functions in 'netlabel_user.h'?  I
> > ask because this header is related to the NetLabel netlink interface,
> > with some minor audit stuff tossed in for good measure; it really has
> > nothing to do with the LSM secctx/secid stuff.  I'd probably prefer these
> > functions end up in their own header file for the sake of better
> > organization, maybe
> > 'netlabel_secid.h'?
> 
> I can put it anywhere you like. I'd prefer netlabel_lsm.h to
> netlabel_secid.h, but if you have a strong preference I'll defer to your
> conventions.

That's fine too.

Thanks.

-- 
paul moore
www.paul-moore.com

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