WireGuard Archive on lore.kernel.org
 help / color / Atom feed
From: Julian Orth <ju.orth@gmail.com>
To: WireGuard mailing list <wireguard@lists.zx2c4.com>
Subject: Re: [PATCH v4 08/12] netlink: allow modification of transit net
Date: Sun, 7 Oct 2018 18:23:53 +0200
Message-ID: <1cffa02d-15bd-97cc-d760-8c6f73799326@gmail.com> (raw)
In-Reply-To: <20181007141139.26310-9-ju.orth@gmail.com>

On 10/7/18 4:11 PM, Julian Orth wrote:
> +static int set_socket(struct wireguard_device *wg, struct nlattr **attrs)
>  {
[...]
>  
> -	ret = test_socket_net_capable(wg->transit_net);
> +	ret = test_socket_net_capable(net ? : wg->transit_net);

This is wrong. The capability is checked even if the user hasn't provided any
of the socket attributes. Instead we must check for the capability iff at
least one of the three attributes is provided. It's not sufficient to move the
check below

> +	if (wg->incoming_port == port && (!net || wg->transit_net == net))
> +		goto out;

because this would allow an unprivileged caller to find the port and transit
namespace by trial and error.

I'll fix this in the next version.
_______________________________________________
WireGuard mailing list
WireGuard@lists.zx2c4.com
https://lists.zx2c4.com/mailman/listinfo/wireguard

  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-07 14:11 [PATCH v4 00/12] Allow changing the transit namespace Julian Orth
2018-10-07 14:11 ` [PATCH v4 01/12] device: protect socket_init with device_update_lock Julian Orth
2018-10-07 15:48   ` Jason A. Donenfeld
2018-10-07 15:55     ` Julian Orth
2018-10-07 14:11 ` [PATCH v4 02/12] netlink: check for CAP_NET_ADMIN manually Julian Orth
2018-10-07 14:11 ` [PATCH v4 03/12] netlink: allow specifying the device namespace Julian Orth
2018-10-07 14:11 ` [PATCH v4 04/12] netlink: restrict access to the UDP socket Julian Orth
2018-10-07 14:11 ` [PATCH v4 05/12] device: rename creating_net to transit_net Julian Orth
2018-10-07 14:11 ` [PATCH v4 06/12] device: store a copy of the device net Julian Orth
2018-10-07 14:11 ` [PATCH v4 07/12] socket: allow modification of transit_net Julian Orth
2018-10-07 14:11 ` [PATCH v4 08/12] netlink: allow modification of transit net Julian Orth
2018-10-07 16:23   ` Julian Orth [this message]
2018-10-07 14:11 ` [PATCH v4 09/12] tools: add framework for shared options Julian Orth
2018-10-07 14:11 ` [PATCH v4 10/12] tools: allow specifying the device namespace Julian Orth
2018-10-07 14:11 ` [PATCH v4 11/12] tools: allow modification of transit net Julian Orth
2018-10-07 14:11 ` [PATCH v4 12/12] tests: add test for transit-net Julian Orth

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1cffa02d-15bd-97cc-d760-8c6f73799326@gmail.com \
    --to=ju.orth@gmail.com \
    --cc=wireguard@lists.zx2c4.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

WireGuard Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/wireguard/0 wireguard/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 wireguard wireguard/ https://lore.kernel.org/wireguard \
		wireguard@lists.zx2c4.com zx2c4-wireguard@archiver.kernel.org
	public-inbox-index wireguard


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/com.zx2c4.lists.wireguard


AGPL code for this site: git clone https://public-inbox.org/ public-inbox