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ktls.c
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ktls.c
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/*
* Copyright 2018-2020 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"
#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;
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(const SSL *s, const EVP_CIPHER *c, EVP_CIPHER_CTX *dd,
void *rl_sequence, ktls_crypto_info_t *crypto_info,
unsigned char **rec_seq, 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_iv_length(dd);
else
crypto_info->iv_len = EVP_GCM_TLS_FIXED_IV_LEN;
break;
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_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_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 (rec_seq != NULL)
*rec_seq = crypto_info->rec_seq;
# else
if (rec_seq != NULL)
*rec_seq = NULL;
# 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 */
switch (EVP_CIPHER_nid(c))
{
# ifdef OPENSSL_KTLS_AES_CCM_128
case NID_aes_128_ccm:
if (EVP_CIPHER_CTX_tag_length(dd) != EVP_CCM_TLS_TAG_LEN)
return 0;
# endif
# ifdef OPENSSL_KTLS_AES_GCM_128
case NID_aes_128_gcm:
# endif
# ifdef OPENSSL_KTLS_AES_GCM_256
case NID_aes_256_gcm:
# endif
return 1;
default:
return 0;
}
}
/* Function to configure kernel TLS structure */
int ktls_configure_crypto(const SSL *s, const EVP_CIPHER *c, EVP_CIPHER_CTX *dd,
void *rl_sequence, ktls_crypto_info_t *crypto_info,
unsigned char **rec_seq, unsigned char *iv,
unsigned char *key, unsigned char *mac_key,
size_t mac_secret_size)
{
unsigned char geniv[12];
unsigned char *iiv = iv;
if (s->version == TLS1_2_VERSION &&
EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
if (!EVP_CIPHER_CTX_get_iv_state(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_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_key_length(c));
memcpy(crypto_info->gcm128.rec_seq, rl_sequence,
TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
if (rec_seq != NULL)
*rec_seq = crypto_info->gcm128.rec_seq;
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_key_length(c));
memcpy(crypto_info->gcm256.rec_seq, rl_sequence,
TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
if (rec_seq != NULL)
*rec_seq = crypto_info->gcm256.rec_seq;
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_key_length(c));
memcpy(crypto_info->ccm128.rec_seq, rl_sequence,
TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
if (rec_seq != NULL)
*rec_seq = crypto_info->ccm128.rec_seq;
return 1;
# endif
default:
return 0;
}
}
#endif /* OPENSSL_SYS_LINUX */