linux-kernel - Re: [PATCH] selinux: Assign proper class to PF_UNIX/SOCK

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Date:   Tue, 20 Jun 2017 15:49:05 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Luis Ressel <aranea@...ah.de>, Stephen Smalley <sds@...ho.nsa.gov>
Cc:     Eric Paris <eparis@...isplace.org>,
        James Morris <james.l.morris@...cle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>, selinux@...ho.nsa.gov,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selinux: Assign proper class to PF_UNIX/SOCK_RAW sockets

On Mon, Jun 19, 2017 at 5:33 PM, Luis Ressel <aranea@...ah.de> wrote:
> For PF_UNIX, SOCK_RAW is synonymous with SOCK_DGRAM (cf.
> net/unix/af_unix.c). This is a tad obscure, but libpcap uses it.
>
> Signed-off-by: Luis Ressel <aranea@...ah.de>
> Acked-by: Stephen Smalley <sds@...ho.nsa.gov>
> ---
>  security/selinux/hooks.c | 1 +
>  1 file changed, 1 insertion(+)

My only concern is what effect this will have on existing policy.
Prior to this patch PF_UNIX/SOCK_RAW will result in the generic
"socket" class where after this patch it will result in the
"unix_dgram_socket".  I believe this is the right change, but it seems
like this should be wrapped by a policy capability, yes?

> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 819fd6858b49..1a331fba4a3c 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -1275,6 +1275,7 @@ static inline u16 socket_type_to_security_class(int family, int type, int protoc
>                 case SOCK_SEQPACKET:
>                         return SECCLASS_UNIX_STREAM_SOCKET;
>                 case SOCK_DGRAM:
> +               case SOCK_RAW:
>                         return SECCLASS_UNIX_DGRAM_SOCKET;
>                 }
>                 break;
> --
> 2.13.1

-- 
paul moore
www.paul-moore.com