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openssl/ssl/ktls.c
Matt Caswell fecb3aae22 Update copyright year 
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Release: yes
2022-05-03 13:34:51 +01:00

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/*
* Copyright 2018-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "ssl_local.h"
#include "internal/ktls.h"
#ifndef OPENSSL_NO_KTLS_RX
/*
* Count the number of records that were not processed yet from record boundary.
*
* This function assumes that there are only fully formed records read in the
* record layer. If read_ahead is enabled, then this might be false and this
* function will fail.
*/
static int count_unprocessed_records(SSL *s)
{
SSL3_BUFFER *rbuf = RECORD_LAYER_get_rbuf(&s->rlayer);
PACKET pkt, subpkt;
int count = 0;
if (!PACKET_buf_init(&pkt, rbuf->buf + rbuf->offset, rbuf->left))
return -1;
while (PACKET_remaining(&pkt) > 0) {
/* Skip record type and version */
if (!PACKET_forward(&pkt, 3))
return -1;
/* Read until next record */
if (!PACKET_get_length_prefixed_2(&pkt, &subpkt))
return -1;
count += 1;
}
return count;
}
/*
* The kernel cannot offload receive if a partial TLS record has been read.
* Check the read buffer for unprocessed records. If the buffer contains a
* partial record, fail and return 0. Otherwise, update the sequence
* number at *rec_seq for the count of unprocessed records and return 1.
*/
static int check_rx_read_ahead(SSL *s, unsigned char *rec_seq)
{
int bit, count_unprocessed;
count_unprocessed = count_unprocessed_records(s);
if (count_unprocessed < 0)
return 0;
/* increment the crypto_info record sequence */
while (count_unprocessed) {
for (bit = 7; bit >= 0; bit--) { /* increment */
++rec_seq[bit];
if (rec_seq[bit] != 0)
break;
}
count_unprocessed--;
}
return 1;
}
#endif
#if defined(__FreeBSD__)
# include "crypto/cryptodev.h"
/*-
* Check if a given cipher is supported by the KTLS interface.
* The kernel might still fail the setsockopt() if no suitable
* provider is found, but this checks if the socket option
* supports the cipher suite used at all.
*/
int ktls_check_supported_cipher(const SSL *s, const EVP_CIPHER *c,
const EVP_CIPHER_CTX *dd)
{
switch (s->version) {
case TLS1_VERSION:
case TLS1_1_VERSION:
case TLS1_2_VERSION:
case TLS1_3_VERSION:
break;
default:
return 0;
}
switch (s->s3.tmp.new_cipher->algorithm_enc) {
case SSL_AES128GCM:
case SSL_AES256GCM:
return 1;
# ifdef OPENSSL_KTLS_CHACHA20_POLY1305
case SSL_CHACHA20POLY1305:
return 1;
# endif
case SSL_AES128:
case SSL_AES256:
if (s->ext.use_etm)
return 0;
switch (s->s3.tmp.new_cipher->algorithm_mac) {
case SSL_SHA1:
case SSL_SHA256:
case SSL_SHA384:
return 1;
default:
return 0;
}
default:
return 0;
}
}
/* Function to configure kernel TLS structure */
int ktls_configure_crypto(SSL *s, const EVP_CIPHER *c, EVP_CIPHER_CTX *dd,
void *rl_sequence, ktls_crypto_info_t *crypto_info,
int is_tx, unsigned char *iv,
unsigned char *key, unsigned char *mac_key,
size_t mac_secret_size)
{
memset(crypto_info, 0, sizeof(*crypto_info));
switch (s->s3.tmp.new_cipher->algorithm_enc) {
case SSL_AES128GCM:
case SSL_AES256GCM:
crypto_info->cipher_algorithm = CRYPTO_AES_NIST_GCM_16;
if (s->version == TLS1_3_VERSION)
crypto_info->iv_len = EVP_CIPHER_CTX_get_iv_length(dd);
else
crypto_info->iv_len = EVP_GCM_TLS_FIXED_IV_LEN;
break;
# ifdef OPENSSL_KTLS_CHACHA20_POLY1305
case SSL_CHACHA20POLY1305:
crypto_info->cipher_algorithm = CRYPTO_CHACHA20_POLY1305;
crypto_info->iv_len = EVP_CIPHER_CTX_get_iv_length(dd);
break;
# endif
case SSL_AES128:
case SSL_AES256:
switch (s->s3.tmp.new_cipher->algorithm_mac) {
case SSL_SHA1:
crypto_info->auth_algorithm = CRYPTO_SHA1_HMAC;
break;
case SSL_SHA256:
crypto_info->auth_algorithm = CRYPTO_SHA2_256_HMAC;
break;
case SSL_SHA384:
crypto_info->auth_algorithm = CRYPTO_SHA2_384_HMAC;
break;
default:
return 0;
}
crypto_info->cipher_algorithm = CRYPTO_AES_CBC;
crypto_info->iv_len = EVP_CIPHER_get_iv_length(c);
crypto_info->auth_key = mac_key;
crypto_info->auth_key_len = mac_secret_size;
break;
default:
return 0;
}
crypto_info->cipher_key = key;
crypto_info->cipher_key_len = EVP_CIPHER_get_key_length(c);
crypto_info->iv = iv;
crypto_info->tls_vmajor = (s->version >> 8) & 0x000000ff;
crypto_info->tls_vminor = (s->version & 0x000000ff);
# ifdef TCP_RXTLS_ENABLE
memcpy(crypto_info->rec_seq, rl_sequence, sizeof(crypto_info->rec_seq));
if (!is_tx && !check_rx_read_ahead(s, crypto_info->rec_seq))
return 0;
# else
if (!is_tx)
return 0;
# endif
return 1;
};
#endif /* __FreeBSD__ */
#if defined(OPENSSL_SYS_LINUX)
/* Function to check supported ciphers in Linux */
int ktls_check_supported_cipher(const SSL *s, const EVP_CIPHER *c,
const EVP_CIPHER_CTX *dd)
{
switch (s->version) {
case TLS1_2_VERSION:
case TLS1_3_VERSION:
break;
default:
return 0;
}
/* check that cipher is AES_GCM_128, AES_GCM_256, AES_CCM_128
* or Chacha20-Poly1305
*/
# ifdef OPENSSL_KTLS_AES_CCM_128
if (EVP_CIPHER_is_a(c, "AES-128-CCM")) {
if (s->version == TLS_1_3_VERSION /* broken on 5.x kernels */
|| EVP_CIPHER_CTX_get_tag_length(dd) != EVP_CCM_TLS_TAG_LEN)
return 0;
return 1;
} else
# endif
if (0
# ifdef OPENSSL_KTLS_AES_GCM_128
|| EVP_CIPHER_is_a(c, "AES-128-GCM")
# endif
# ifdef OPENSSL_KTLS_AES_GCM_256
|| EVP_CIPHER_is_a(c, "AES-256-GCM")
# endif
# ifdef OPENSSL_KTLS_CHACHA20_POLY1305
|| EVP_CIPHER_is_a(c, "ChaCha20-Poly1305")
# endif
) {
return 1;
}
return 0;
}
/* Function to configure kernel TLS structure */
int ktls_configure_crypto(SSL *s, const EVP_CIPHER *c, EVP_CIPHER_CTX *dd,
void *rl_sequence, ktls_crypto_info_t *crypto_info,
int is_tx, unsigned char *iv,
unsigned char *key, unsigned char *mac_key,
size_t mac_secret_size)
{
unsigned char geniv[12];
unsigned char *iiv = iv;
# ifdef OPENSSL_NO_KTLS_RX
if (!is_tx)
return 0;
# endif
if (s->version == TLS1_2_VERSION &&
EVP_CIPHER_get_mode(c) == EVP_CIPH_GCM_MODE) {
if (!EVP_CIPHER_CTX_get_updated_iv(dd, geniv,
EVP_GCM_TLS_FIXED_IV_LEN
+ EVP_GCM_TLS_EXPLICIT_IV_LEN))
return 0;
iiv = geniv;
}
memset(crypto_info, 0, sizeof(*crypto_info));
switch (EVP_CIPHER_get_nid(c))
{
# ifdef OPENSSL_KTLS_AES_GCM_128
case NID_aes_128_gcm:
crypto_info->gcm128.info.cipher_type = TLS_CIPHER_AES_GCM_128;
crypto_info->gcm128.info.version = s->version;
crypto_info->tls_crypto_info_len = sizeof(crypto_info->gcm128);
memcpy(crypto_info->gcm128.iv, iiv + EVP_GCM_TLS_FIXED_IV_LEN,
TLS_CIPHER_AES_GCM_128_IV_SIZE);
memcpy(crypto_info->gcm128.salt, iiv, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
memcpy(crypto_info->gcm128.key, key, EVP_CIPHER_get_key_length(c));
memcpy(crypto_info->gcm128.rec_seq, rl_sequence,
TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
if (!is_tx && !check_rx_read_ahead(s, crypto_info->gcm128.rec_seq))
return 0;
return 1;
# endif
# ifdef OPENSSL_KTLS_AES_GCM_256
case NID_aes_256_gcm:
crypto_info->gcm256.info.cipher_type = TLS_CIPHER_AES_GCM_256;
crypto_info->gcm256.info.version = s->version;
crypto_info->tls_crypto_info_len = sizeof(crypto_info->gcm256);
memcpy(crypto_info->gcm256.iv, iiv + EVP_GCM_TLS_FIXED_IV_LEN,
TLS_CIPHER_AES_GCM_256_IV_SIZE);
memcpy(crypto_info->gcm256.salt, iiv, TLS_CIPHER_AES_GCM_256_SALT_SIZE);
memcpy(crypto_info->gcm256.key, key, EVP_CIPHER_get_key_length(c));
memcpy(crypto_info->gcm256.rec_seq, rl_sequence,
TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
if (!is_tx && !check_rx_read_ahead(s, crypto_info->gcm256.rec_seq))
return 0;
return 1;
# endif
# ifdef OPENSSL_KTLS_AES_CCM_128
case NID_aes_128_ccm:
crypto_info->ccm128.info.cipher_type = TLS_CIPHER_AES_CCM_128;
crypto_info->ccm128.info.version = s->version;
crypto_info->tls_crypto_info_len = sizeof(crypto_info->ccm128);
memcpy(crypto_info->ccm128.iv, iiv + EVP_CCM_TLS_FIXED_IV_LEN,
TLS_CIPHER_AES_CCM_128_IV_SIZE);
memcpy(crypto_info->ccm128.salt, iiv, TLS_CIPHER_AES_CCM_128_SALT_SIZE);
memcpy(crypto_info->ccm128.key, key, EVP_CIPHER_get_key_length(c));
memcpy(crypto_info->ccm128.rec_seq, rl_sequence,
TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
if (!is_tx && !check_rx_read_ahead(s, crypto_info->ccm128.rec_seq))
return 0;
return 1;
# endif
# ifdef OPENSSL_KTLS_CHACHA20_POLY1305
case NID_chacha20_poly1305:
crypto_info->chacha20poly1305.info.cipher_type = TLS_CIPHER_CHACHA20_POLY1305;
crypto_info->chacha20poly1305.info.version = s->version;
crypto_info->tls_crypto_info_len = sizeof(crypto_info->chacha20poly1305);
memcpy(crypto_info->chacha20poly1305.iv, iiv,
TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
memcpy(crypto_info->chacha20poly1305.key, key,
EVP_CIPHER_get_key_length(c));
memcpy(crypto_info->chacha20poly1305.rec_seq, rl_sequence,
TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE);
if (!is_tx
&& !check_rx_read_ahead(s,
crypto_info->chacha20poly1305.rec_seq))
return 0;
return 1;
# endif
default:
return 0;
}
}
#endif /* OPENSSL_SYS_LINUX */
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