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net: tls: Add tls 1.3 support

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TLS 1.3 has minor changes from TLS 1.2 at the record layer.

* Header now hardcodes the same version and application content type in
  the header.
* The real content type is appended after the data, before encryption (or
  after decryption).
* The IV is xored with the sequence number, instead of concatinating four
  bytes of IV with the explicit IV.
* Zero-padding:  No exlicit length is given, we search backwards from the
  end of the decrypted data for the first non-zero byte, which is the
  content type.  Currently recv supports reading zero-padding, but there
  is no way for send to add zero padding.

Signed-off-by: Dave Watson <davejwatson@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dave Watson 2019-01-30 21:58:31 +00:00 • committed by David S. Miller
parent fedf201e12
commit 130b392c6c
6 changed files with 154 additions and 43 deletions
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3
net/tls/tls_main.c
View file

@ -463,7 +463,8 @@ static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
}
/* check version */
if (crypto_info->version != TLS_1_2_VERSION) {
if (crypto_info->version != TLS_1_2_VERSION &&
crypto_info->version != TLS_1_3_VERSION) {
rc = -ENOTSUPP;
goto err_crypto_info;
}