From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
To: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
Cc: mic@digikod.net, linux-security-module@vger.kernel.org,
netdev@vger.kernel.org, netfilter@vger.kernel.org,
yusongping@huawei.com, artem.kuzin@huawei.com
Subject: Re: [RFC PATCH 1/2] landlock: TCP network hooks implementation
Date: Tue, 25 Jan 2022 09:17:10 -0500 [thread overview]
Message-ID: <CA+FuTSf4EjgjBCCOiu-PHJcTMia41UkTh8QJ0+qdxL_J8445EA@mail.gmail.com> (raw)
In-Reply-To: <20220124080215.265538-2-konstantin.meskhidze@huawei.com>
On Mon, Jan 24, 2022 at 3:02 AM Konstantin Meskhidze
<konstantin.meskhidze@huawei.com> wrote:
>
> Support of socket_bind() and socket_connect() hooks.
> Current prototype can restrict binding and connecting of TCP
> types of sockets. Its just basic idea how Landlock could support
> network confinement.
>
> Changes:
> 1. Access masks array refactored into 1D one and changed
> to 32 bits. Filesystem masks occupy 16 lower bits and network
> masks reside in 16 upper bits.
> 2. Refactor API functions in ruleset.c:
> 1. Add void *object argument.
> 2. Add u16 rule_type argument.
> 3. Use two rb_trees in ruleset structure:
> 1. root_inode - for filesystem objects
> 2. root_net_port - for network port objects
>
> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
> +static int hook_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
> +{
> + short socket_type;
> + struct sockaddr_in *sockaddr;
> + u16 port;
> + const struct landlock_ruleset *const dom = landlock_get_current_domain();
> +
> + /* Check if the hook is AF_INET* socket's action */
> + if ((address->sa_family != AF_INET) && (address->sa_family != AF_INET6))
> + return 0;
Should this be a check on the socket family (sock->ops->family)
instead of the address family?
It is valid to pass an address with AF_UNSPEC to a PF_INET(6) socket.
And there are legitimate reasons to want to deny this. Such as passing
a connection to a unprivileged process and disallow it from disconnect
and opening a different new connection.
> +
> + socket_type = sock->type;
> + /* Check if it's a TCP socket */
> + if (socket_type != SOCK_STREAM)
> + return 0;
> +
> + if (!dom)
> + return 0;
> +
> + /* Get port value in host byte order */
> + sockaddr = (struct sockaddr_in *)address;
> + port = ntohs(sockaddr->sin_port);
> +
> + return check_socket_access(dom, port, LANDLOCK_ACCESS_NET_CONNECT_TCP);
> +}
next prev parent reply other threads:[~2022-01-25 14:21 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-24 8:02 [RFC PATCH 0/2] landlock network implementation cover letter Konstantin Meskhidze
2022-01-24 8:02 ` [RFC PATCH 1/2] landlock: TCP network hooks implementation Konstantin Meskhidze
2022-01-25 14:17 ` Willem de Bruijn [this message]
2022-01-26 8:05 ` Konstantin Meskhidze
2022-01-26 14:15 ` Willem de Bruijn
2022-01-29 3:12 ` Konstantin Meskhidze
2022-01-31 17:14 ` Willem de Bruijn
2022-02-01 12:33 ` Mickaël Salaün
2022-02-07 2:31 ` Konstantin Meskhidze
2022-02-07 16:00 ` Willem de Bruijn
2022-02-07 16:17 ` Willem de Bruijn
2022-02-10 2:05 ` Konstantin Meskhidze
2022-02-10 2:04 ` Konstantin Meskhidze
2022-02-01 12:28 ` Mickaël Salaün
2022-02-07 2:35 ` Konstantin Meskhidze
2022-02-01 12:13 ` Mickaël Salaün
2022-02-07 13:09 ` Konstantin Meskhidze
2022-02-07 14:17 ` Mickaël Salaün
2022-02-08 7:55 ` Konstantin Meskhidze
2022-02-08 12:09 ` Mickaël Salaün
2022-02-09 3:06 ` Konstantin Meskhidze
2022-01-24 8:02 ` [RFC PATCH 2/2] landlock: selftests for bind and connect hooks Konstantin Meskhidze
2022-02-01 18:31 ` Mickaël Salaün
2022-02-07 7:11 ` Konstantin Meskhidze
2022-02-07 12:49 ` Mickaël Salaün
2022-02-08 3:01 ` Konstantin Meskhidze
2022-02-08 12:17 ` Mickaël Salaün
2022-02-09 3:03 ` Konstantin Meskhidze
2022-02-10 10:16 ` Mickaël Salaün
2022-02-24 3:18 ` Konstantin Meskhidze
2022-02-24 9:55 ` Mickaël Salaün
2022-02-24 12:03 ` Konstantin Meskhidze
2022-02-24 14:15 ` Mickaël Salaün
2022-02-25 2:44 ` Konstantin Meskhidze
2022-02-01 17:53 ` [RFC PATCH 0/2] landlock network implementation cover letter Mickaël Salaün
2022-02-07 13:18 ` Konstantin Meskhidze
2022-02-07 13:35 ` Mickaël Salaün
2022-02-08 3:53 ` Konstantin Meskhidze
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