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Re: [PATCH] Add audit uid to netlink credentials

On Wed, 2005-02-09 at 13:37, Chris Wright wrote:
> This means sendmsg hook would set the SID?  And in that case, you'd
> stomp on loginuid for audit messages unless they are special cased.

I was referring to a separate field for use by security modules, not
re-use of the same field being proposed for the loginuid.  Yes, it would
be set by the security_netlink_send hook.  The principal problem with
such a security field is that unless we mandate it to be a simple
integer value (like a SELinux SID), we have to deal with lifecycle
management for it, i.e. a set of hooks that starts to look like the
sk_buff security hooks from the old LSM patch.  But if we can limit it
to a simple value, then it would be useful for such security
identifiers, and allow receiver-side permission checks based on the
sender SID.

> The loginuid is special case to audit, it doesn't make sense to me that
> it is in generic netlink_skb_parms structure unless it's used by more
> netlink users.

So you also think it should be in the payload?  That would require
security_netlink_send to dig into the payload if we wanted to control
who can specify other loginuids, as Serge noted.

Stephen Smalley <sds epoch ncsc mil>
National Security Agency

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