linux-kernel - Re: [PATCH 3/3] net: rxrpc: Replace time_t type with time64

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Date:   Wed, 09 Aug 2017 16:45:47 +0100
From:   David Howells <dhowells@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     dhowells@...hat.com, Baolin Wang <baolin.wang@...aro.org>,
        David Miller <davem@...emloft.net>, james.l.morris@...cle.com,
        "Serge E. Hallyn" <serge@...lyn.com>, marc.dionne@...istor.com,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Mark Brown <broonie@...nel.org>, keyrings@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH 3/3] net: rxrpc: Replace time_t type with time64_t type

Arnd Bergmann <arnd@...db.de> wrote:

> Ah, I'm slowly starting to understand how this fits together. So you can add
> a key either through key_add() from local user space, or through an rxrpc
> socket.

No, you can't add keys through an rxrpc socket.

There are three 'classes' of key:

 (1) Client keys (type rxrpc).  These must be added by add_key() by userspace
     (but could also be acquired by upcalling to /sbin/request-key) and then
     the kernel calls request_key() to locate them on entry through either a
     kafs inode/file operation or through sendmsg() to an AF_RXRPC socket.

 (2) Server keys (type rxrpc_s).  These are created by userspace and are
     presented to an AF_RXRPC server socket by calling setsockopt().  The
     server uses these to validate/decrypt the token passed by a RESPONSE
     packet.

 (3) Service connection keys (type rxrpc).  These are created internally by
     AF_RXRPC after a successful challenge/response negotiation to hold the
     security details so that we have a struct key to pass around that
     corresponds to the key in (1).

David