From: Leonard Crestez <cdleonard@gmail.com>
To: Dmitry Safonov <0x7f454c46@gmail.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,
Shuah Khan <shuah@kernel.org>, Eric Dumazet <edumazet@google.com>,
David Ahern <dsahern@kernel.org>
Subject: Re: [PATCH v2 06/25] tcp: authopt: Compute packet signatures
Date: Fri, 5 Nov 2021 08:09:34 +0200 [thread overview]
Message-ID: <a115cbfa-b68a-422c-d6c2-034c77496823@gmail.com> (raw)
In-Reply-To: <7a32f18e-aa92-8fd8-4f53-72b4ef8b0ffc@gmail.com>
On 11/5/21 4:08 AM, Dmitry Safonov wrote:
> On 11/1/21 16:34, Leonard Crestez wrote:
> [..]
>> +/* Find TCP_AUTHOPT in header.
>> + *
>> + * Returns pointer to TCP_AUTHOPT or NULL if not found.
>> + */
>> +static u8 *tcp_authopt_find_option(struct tcphdr *th)
>> +{
>> + int length = (th->doff << 2) - sizeof(*th);
>> + u8 *ptr = (u8 *)(th + 1);
>> +
>> + while (length >= 2) {
>> + int opcode = *ptr++;
>> + int opsize;
>> +
>> + switch (opcode) {
>> + case TCPOPT_EOL:
>> + return NULL;
>> + case TCPOPT_NOP:
>> + length--;
>> + continue;
>> + default:
>> + if (length < 2)
>> + return NULL;
>
> ^ never true, as checked by the loop condition
>
>> + opsize = *ptr++;
>> + if (opsize < 2)
>> + return NULL;
>> + if (opsize > length)
>> + return NULL;
>> + if (opcode == TCPOPT_AUTHOPT)
>> + return ptr - 2;
>> + }
>> + ptr += opsize - 2;
>> + length -= opsize;
>> + }
>> + return NULL;
>> +}
>
> Why copy'n'pasting tcp_parse_md5sig_option(), rather than adding a new
> argument to the function?
No good reason.
There is a requirement in RFC5925 that packets with both AO and MD5
signatures be dropped. This currently works but the implementation is
convoluted: after an AO signature is found an error is returned if MD5
is also present.
A better solution would be to do a single scan for both options up
front, for example in tcp_{v4,v6}_auth_inbound_check
--
Regards,
Leonard
next prev parent reply other threads:[~2021-11-05 6:09 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 [this message]
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
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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