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From: Dmitry Safonov <0x7f454c46@gmail.com>
To: Leonard Crestez <cdleonard@gmail.com>,
	David Ahern <dsahern@kernel.org>, Shuah Khan <shuah@kernel.org>,
	Eric Dumazet <edumazet@google.com>
Cc: "David S. Miller" <davem@davemloft.net>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Kuniyuki Iwashima <kuniyu@amazon.co.jp>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	Jakub Kicinski <kuba@kernel.org>,
	Yuchung Cheng <ycheng@google.com>,
	Francesco Ruggeri <fruggeri@arista.com>,
	Mat Martineau <mathew.j.martineau@linux.intel.com>,
	Christoph Paasch <cpaasch@apple.com>,
	Ivan Delalande <colona@arista.com>,
	Priyaranjan Jha <priyarjha@google.com>,
	netdev@vger.kernel.org, linux-crypto@vger.kernel.org,
	linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 09/25] tcp: authopt: Disable via sysctl by default
Date: Fri, 5 Nov 2021 01:46:10 +0000	[thread overview]
Message-ID: <cccdd347-57ee-62e5-2824-a3e7e2910395@gmail.com> (raw)
In-Reply-To: <137399b962131c278acbfa5446a3b6d59aa0547b.1635784253.git.cdleonard@gmail.com>

On 11/1/21 16:34, Leonard Crestez wrote:
> This is mainly intended to protect against local privilege escalations
> through a rarely used feature so it is deliberately not namespaced.
> 
> Enforcement is only at the setsockopt level, this should be enough to
> ensure that the tcp_authopt_needed static key never turns on.
> 
> No effort is made to handle disabling when the feature is already in
> use.
> 
> Signed-off-by: Leonard Crestez <cdleonard@gmail.com>
> ---
[..]
> diff --git a/net/ipv4/tcp_authopt.c b/net/ipv4/tcp_authopt.c
> index 5e80e5e5e36e..7c49dcce7d24 100644
> --- a/net/ipv4/tcp_authopt.c
> +++ b/net/ipv4/tcp_authopt.c
> @@ -3,10 +3,15 @@
>  #include <linux/kernel.h>
>  #include <net/tcp.h>
>  #include <net/tcp_authopt.h>
>  #include <crypto/hash.h>
>  
> +/* This is mainly intended to protect against local privilege escalations through
> + * a rarely used feature so it is deliberately not namespaced.
> + */
> +int sysctl_tcp_authopt;

Could you add pr_warn_once() for setsockopt() without this set, so that
it's visible in dmesg for a user that gets -EPERM.

Thanks,
          Dmitry

  parent reply	other threads:[~2021-11-05  1:46 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-01 16:34 [PATCH v2] tcp: Initial support for RFC5925 auth option Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 01/25] tcp: authopt: Initial support and key management Leonard Crestez
2021-11-03  2:29   ` David Ahern
2021-11-05 12:10     ` Leonard Crestez
2021-11-05  1:22   ` Dmitry Safonov
2021-11-05  7:04     ` Leonard Crestez
2021-11-05 14:50       ` Dmitry Safonov
2021-11-05 18:00         ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 02/25] docs: Add user documentation for tcp_authopt Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 03/25] selftests: Initial tcp_authopt test module Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 04/25] selftests: tcp_authopt: Initial sockopt manipulation Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 05/25] tcp: authopt: Add crypto initialization Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 06/25] tcp: authopt: Compute packet signatures Leonard Crestez
2021-11-05  1:53   ` Dmitry Safonov
2021-11-05  6:39     ` Leonard Crestez
2021-11-05  2:08   ` Dmitry Safonov
2021-11-05  6:09     ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 07/25] tcp: Use BIT() for OPTION_* constants Leonard Crestez
2021-11-03  2:31   ` David Ahern
2021-11-03 22:19     ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 08/25] tcp: authopt: Hook into tcp core Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 09/25] tcp: authopt: Disable via sysctl by default Leonard Crestez
2021-11-03  2:39   ` David Ahern
2021-11-05  8:50     ` Leonard Crestez
2021-11-05  1:46   ` Dmitry Safonov [this message]
2021-11-01 16:34 ` [PATCH v2 10/25] selftests: tcp_authopt: Test key address binding Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 11/25] tcp: authopt: Implement Sequence Number Extension Leonard Crestez
2021-11-01 19:22   ` Francesco Ruggeri
2021-11-02 10:03     ` Leonard Crestez
2021-11-02 19:21       ` Francesco Ruggeri
2021-11-03 22:01         ` Leonard Crestez
2021-11-01 20:54   ` Eric Dumazet
2021-11-02  9:50     ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 12/25] tcp: ipv6: Add AO signing for tcp_v6_send_response Leonard Crestez
2021-11-03  2:44   ` David Ahern
2021-11-03 22:09     ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 13/25] tcp: authopt: Add support for signing skb-less replies Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 14/25] tcp: ipv4: Add AO signing for " Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 15/25] selftests: tcp_authopt: Implement SNE in python Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 16/25] selftests: tcp_authopt: Add scapy-based packet signing code Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 17/25] selftests: tcp_authopt: Add packet-level tests Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 18/25] selftests: tcp_authopt: Initial sne test Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 19/25] tcp: authopt: Add key selection controls Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 20/25] selftests: tcp_authopt: Add tests for rollover Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 21/25] tcp: authopt: Add initial l3index support Leonard Crestez
2021-11-03  3:06   ` David Ahern
2021-11-05 12:26     ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 22/25] selftests: tcp_authopt: Initial tests for l3mdev handling Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 23/25] selftests: nettest: Rename md5_prefix to key_addr_prefix Leonard Crestez
2021-11-03  3:08   ` David Ahern
2021-11-01 16:34 ` [PATCH v2 24/25] selftests: nettest: Initial tcp_authopt support Leonard Crestez
2021-11-03  3:09   ` David Ahern
2021-11-01 16:35 ` [PATCH v2 25/25] selftests: net/fcnal: " Leonard Crestez
2021-11-03  3:18 ` [PATCH v2] tcp: Initial support for RFC5925 auth option David Ahern
2021-11-03 22:22   ` Leonard Crestez

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