/* * 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 /*- * 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 */