/src/gnutls/lib/system/ktls.c

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/*
 * Copyright (C) 2021 Free Software Foundation, Inc.
 *
 * Author: Fratnišek Krenželok
 *
 * This file is part of GnuTLS.
 *
 * The GnuTLS is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>
 *
 */

#include "config.h"
#include "system/ktls.h"

#ifdef ENABLE_KTLS

#include <sys/socket.h>
#include <netinet/tcp.h>
#include <unistd.h>
#include <errno.h>
#include "record.h"

#if defined(__FreeBSD__)
#include <sys/ktls.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <crypto/cryptodev.h>

#else
#include <linux/tls.h>
#include "ext/session_ticket.h"
#include <sys/sendfile.h>
#include <sys/utsname.h>
#endif

/**
 * gnutls_transport_is_ktls_enabled:
 * @session: is a #gnutls_session_t type.
 *
 * Checks if KTLS is now enabled and was properly inicialized.
 *
 * Returns: %GNUTLS_KTLS_RECV, %GNUTLS_KTLS_SEND, %GNUTLS_KTLS_DUPLEX, otherwise 0
 *
 * Since: 3.7.3
 **/
gnutls_transport_ktls_enable_flags_t
gnutls_transport_is_ktls_enabled(gnutls_session_t session)
{
  if (unlikely(!session->internals.initial_negotiation_completed)) {
    _gnutls_debug_log("Initial negotiation is not yet complete\n");
    return 0;
  }

  return session->internals.ktls_enabled;
}

void _gnutls_ktls_enable(gnutls_session_t session)
{
#if defined(__FreeBSD__)
  session->internals.ktls_enabled |= GNUTLS_KTLS_RECV;
  session->internals.ktls_enabled |= GNUTLS_KTLS_SEND;
#else
  int sockin, sockout;

  gnutls_transport_get_int2(session, &sockin, &sockout);

  if (setsockopt(sockin, SOL_TCP, TCP_ULP, "tls", sizeof("tls")) == 0) {
    session->internals.ktls_enabled |= GNUTLS_KTLS_RECV;
    if (sockin == sockout) {
      session->internals.ktls_enabled |= GNUTLS_KTLS_SEND;
    }
  } else {
    _gnutls_record_log(
      "Unable to set TCP_ULP for read socket: %d\n", errno);
  }

  if (sockin != sockout) {
    if (setsockopt(sockout, SOL_TCP, TCP_ULP, "tls",
             sizeof("tls")) == 0) {
      session->internals.ktls_enabled |= GNUTLS_KTLS_SEND;
    } else {
      _gnutls_record_log(
        "Unable to set TCP_ULP for write socket: %d\n",
        errno);
    }
  }
#endif
}

#if defined(__FreeBSD__)

int _gnutls_ktls_set_keys(gnutls_session_t session,
        gnutls_transport_ktls_enable_flags_t in)
{
  gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(session);
  gnutls_datum_t mac_key;
  gnutls_datum_t iv;
  gnutls_datum_t cipher_key;
  unsigned char seq_number[12];
  int sockin, sockout;
  int ret;

  gnutls_transport_get_int2(session, &sockin, &sockout);
  /* check whether or not cipher suite supports ktls
   */
  int version = gnutls_protocol_get_version(session);
  if ((version != GNUTLS_TLS1_3 && version != GNUTLS_TLS1_2) ||
      (cipher != GNUTLS_CIPHER_AES_128_GCM &&
       cipher != GNUTLS_CIPHER_AES_256_GCM &&
       cipher != GNUTLS_CIPHER_CHACHA20_POLY1305)) {
    return GNUTLS_E_UNIMPLEMENTED_FEATURE;
  }

  ret = gnutls_record_get_state(session, 1, &mac_key, &iv, &cipher_key,
              seq_number);
  if (ret < 0) {
    return ret;
  }

  in &= session->internals.ktls_enabled;

  if (in & GNUTLS_KTLS_RECV) {
    struct tls_enable crypto_info;
    memset(&crypto_info, 0, sizeof(crypto_info));
    switch (cipher) {
    case GNUTLS_CIPHER_AES_128_GCM: {
      crypto_info.cipher_algorithm = CRYPTO_AES_NIST_GCM_16;
      assert(cipher_key.size == AES_128_GMAC_KEY_LEN);

      if (version == GNUTLS_TLS1_2) {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_TWO;
        crypto_info.iv =
          gnutls_malloc(TLS_AEAD_GCM_LEN);
        if (!crypto_info.iv) {
          gnutls_assert();
          return GNUTLS_E_MEMORY_ERROR;
        }
        crypto_info.iv_len = TLS_AEAD_GCM_LEN;
        memcpy(crypto_info.iv, seq_number,
               TLS_AEAD_GCM_LEN);
      } else {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_THREE;
        assert(iv.size == TLS_1_3_GCM_IV_LEN);

        crypto_info.iv =
          gnutls_malloc(TLS_1_3_GCM_IV_LEN);
        if (!crypto_info.iv) {
          gnutls_assert();
          return GNUTLS_E_MEMORY_ERROR;
        }
        crypto_info.iv_len = TLS_1_3_GCM_IV_LEN;
        memcpy(crypto_info.iv, iv.data,
               TLS_1_3_GCM_IV_LEN);
      }

      memcpy(crypto_info.rec_seq, seq_number, 8);

      crypto_info.cipher_key_len = AES_128_GMAC_KEY_LEN;
      crypto_info.cipher_key =
        gnutls_malloc(AES_128_GMAC_KEY_LEN);
      if (!crypto_info.cipher_key) {
        gnutls_assert();
        return GNUTLS_E_MEMORY_ERROR;
      }
      memcpy(crypto_info.cipher_key, cipher_key.data,
             AES_128_GMAC_KEY_LEN);

      if (setsockopt(sockin, IPPROTO_TCP, TCP_RXTLS_ENABLE,
               &crypto_info, sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_RECV;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }
    } break;
    case GNUTLS_CIPHER_AES_256_GCM: {
      crypto_info.cipher_algorithm = CRYPTO_AES_NIST_GCM_16;
      assert(cipher_key.size == AES_256_GMAC_KEY_LEN);

      if (version == GNUTLS_TLS1_2) {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_TWO;
        crypto_info.iv =
          gnutls_malloc(TLS_AEAD_GCM_LEN);
        if (!crypto_info.iv) {
          gnutls_assert();
          return GNUTLS_E_MEMORY_ERROR;
        }
        crypto_info.iv_len = TLS_AEAD_GCM_LEN;
        memcpy(crypto_info.iv, seq_number,
               TLS_AEAD_GCM_LEN);
      } else {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_THREE;
        assert(iv.size == TLS_1_3_GCM_IV_LEN);

        crypto_info.iv =
          gnutls_malloc(TLS_1_3_GCM_IV_LEN);
        if (!crypto_info.iv) {
          gnutls_assert();
          return GNUTLS_E_MEMORY_ERROR;
        }
        crypto_info.iv_len = TLS_1_3_GCM_IV_LEN;
        memcpy(crypto_info.iv, iv.data,
               TLS_1_3_GCM_IV_LEN);
      }

      memcpy(crypto_info.rec_seq, seq_number, 8);

      crypto_info.cipher_key_len = AES_256_GMAC_KEY_LEN;
      crypto_info.cipher_key =
        gnutls_malloc(AES_256_GMAC_KEY_LEN);
      if (!crypto_info.cipher_key) {
        gnutls_assert();
        return GNUTLS_E_MEMORY_ERROR;
      }
      memcpy(crypto_info.cipher_key, cipher_key.data,
             AES_256_GMAC_KEY_LEN);

      if (setsockopt(sockin, IPPROTO_TCP, TCP_RXTLS_ENABLE,
               &crypto_info, sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_RECV;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }

    } break;
    case GNUTLS_CIPHER_CHACHA20_POLY1305: {
      crypto_info.cipher_algorithm = CRYPTO_CHACHA20_POLY1305;
      assert(cipher_key.size == POLY1305_KEY_LEN);

      if (version == GNUTLS_TLS1_2) {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_TWO;
      } else {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_THREE;
      }

      assert(iv.size == CHACHA20_POLY1305_IV_LEN);
      crypto_info.iv =
        gnutls_malloc(CHACHA20_POLY1305_IV_LEN);
      if (!crypto_info.iv) {
        gnutls_assert();
        return GNUTLS_E_MEMORY_ERROR;
      }
      crypto_info.iv_len = TLS_CHACHA20_IV_LEN;
      memcpy(crypto_info.iv, iv.data, TLS_CHACHA20_IV_LEN);

      memcpy(crypto_info.rec_seq, seq_number, 8);

      crypto_info.cipher_key_len = POLY1305_KEY_LEN;
      crypto_info.cipher_key =
        gnutls_malloc(POLY1305_KEY_LEN);
      if (!crypto_info.cipher_key) {
        gnutls_assert();
        return GNUTLS_E_MEMORY_ERROR;
      }
      memcpy(crypto_info.cipher_key, cipher_key.data,
             POLY1305_KEY_LEN);

      if (setsockopt(sockin, IPPROTO_TCP, TCP_RXTLS_ENABLE,
               &crypto_info, sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_RECV;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }

    } break;
    default:
      assert(0);
    }
  }

  ret = gnutls_record_get_state(session, 0, &mac_key, &iv, &cipher_key,
              seq_number);
  if (ret < 0) {
    return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
  }

  if (in & GNUTLS_KTLS_SEND) {
    struct tls_enable crypto_info;
    memset(&crypto_info, 0, sizeof(crypto_info));
    switch (cipher) {
    case GNUTLS_CIPHER_AES_128_GCM: {
      crypto_info.cipher_algorithm = CRYPTO_AES_NIST_GCM_16;
      assert(cipher_key.size == AES_128_GMAC_KEY_LEN);

      if (version == GNUTLS_TLS1_2) {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_TWO;
        crypto_info.iv =
          gnutls_malloc(TLS_AEAD_GCM_LEN);
        if (!crypto_info.iv) {
          gnutls_assert();
          return GNUTLS_E_MEMORY_ERROR;
        }
        crypto_info.iv_len = TLS_AEAD_GCM_LEN;
        memcpy(crypto_info.iv, seq_number,
               TLS_AEAD_GCM_LEN);
      } else {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_THREE;
        assert(iv.size == TLS_1_3_GCM_IV_LEN);

        crypto_info.iv =
          gnutls_malloc(TLS_1_3_GCM_IV_LEN);
        if (!crypto_info.iv) {
          gnutls_assert();
          return GNUTLS_E_MEMORY_ERROR;
        }
        crypto_info.iv_len = TLS_1_3_GCM_IV_LEN;
        memcpy(crypto_info.iv, iv.data,
               TLS_1_3_GCM_IV_LEN);
      }

      memcpy(crypto_info.rec_seq, seq_number, 8);

      crypto_info.cipher_key_len = AES_128_GMAC_KEY_LEN;
      crypto_info.cipher_key =
        gnutls_malloc(AES_128_GMAC_KEY_LEN);
      if (!crypto_info.cipher_key) {
        gnutls_assert();
        return GNUTLS_E_MEMORY_ERROR;
      }
      memcpy(crypto_info.cipher_key, cipher_key.data,
             AES_128_GMAC_KEY_LEN);

      if (setsockopt(sockin, IPPROTO_TCP, TCP_TXTLS_ENABLE,
               &crypto_info, sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_SEND;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }
    } break;
    case GNUTLS_CIPHER_AES_256_GCM: {
      crypto_info.cipher_algorithm = CRYPTO_AES_NIST_GCM_16;
      assert(cipher_key.size == AES_256_GMAC_KEY_LEN);

      if (version == GNUTLS_TLS1_2) {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_TWO;
        crypto_info.iv =
          gnutls_malloc(TLS_AEAD_GCM_LEN);
        if (!crypto_info.iv) {
          gnutls_assert();
          return GNUTLS_E_MEMORY_ERROR;
        }
        crypto_info.iv_len = TLS_AEAD_GCM_LEN;
        memcpy(crypto_info.iv, seq_number,
               TLS_AEAD_GCM_LEN);
      } else {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_THREE;
        assert(iv.size == TLS_1_3_GCM_IV_LEN);

        crypto_info.iv =
          gnutls_malloc(TLS_1_3_GCM_IV_LEN);
        if (!crypto_info.iv) {
          gnutls_assert();
          return GNUTLS_E_MEMORY_ERROR;
        }
        crypto_info.iv_len = TLS_1_3_GCM_IV_LEN;
        memcpy(crypto_info.iv, iv.data,
               TLS_1_3_GCM_IV_LEN);
      }

      memcpy(crypto_info.rec_seq, seq_number, 8);

      crypto_info.cipher_key_len = AES_256_GMAC_KEY_LEN;
      crypto_info.cipher_key =
        gnutls_malloc(AES_256_GMAC_KEY_LEN);
      if (!crypto_info.cipher_key) {
        gnutls_assert();
        return GNUTLS_E_MEMORY_ERROR;
      }
      memcpy(crypto_info.cipher_key, cipher_key.data,
             AES_256_GMAC_KEY_LEN);

      if (setsockopt(sockin, IPPROTO_TCP, TCP_TXTLS_ENABLE,
               &crypto_info, sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_SEND;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }

    } break;
    case GNUTLS_CIPHER_CHACHA20_POLY1305: {
      crypto_info.cipher_algorithm = CRYPTO_CHACHA20_POLY1305;
      assert(cipher_key.size == POLY1305_KEY_LEN);

      if (version == GNUTLS_TLS1_2) {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_TWO;
      } else {
        crypto_info.tls_vmajor = TLS_MAJOR_VER_ONE;
        crypto_info.tls_vminor = TLS_MINOR_VER_THREE;
      }

      assert(iv.size == CHACHA20_POLY1305_IV_LEN);
      crypto_info.iv =
        gnutls_malloc(CHACHA20_POLY1305_IV_LEN);
      if (!crypto_info.iv) {
        gnutls_assert();
        return GNUTLS_E_MEMORY_ERROR;
      }
      crypto_info.iv_len = TLS_CHACHA20_IV_LEN;
      memcpy(crypto_info.iv, iv.data, TLS_CHACHA20_IV_LEN);

      memcpy(crypto_info.rec_seq, seq_number, 8);

      crypto_info.cipher_key_len = POLY1305_KEY_LEN;
      crypto_info.cipher_key =
        gnutls_malloc(POLY1305_KEY_LEN);
      if (!crypto_info.cipher_key) {
        gnutls_assert();
        return GNUTLS_E_MEMORY_ERROR;
      }
      memcpy(crypto_info.cipher_key, cipher_key.data,
             POLY1305_KEY_LEN);

      if (setsockopt(sockin, IPPROTO_TCP, TCP_TXTLS_ENABLE,
               &crypto_info, sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_SEND;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }

    } break;
    default:
      assert(0);
    }

    // set callback for sending handshake messages
    gnutls_handshake_set_read_function(
      session, _gnutls_ktls_send_handshake_msg);

    // set callback for sending alert messages
    gnutls_alert_set_read_function(session,
                 _gnutls_ktls_send_alert_msg);
  }

  return in;
}
#else

int _gnutls_ktls_set_keys(gnutls_session_t session,
        gnutls_transport_ktls_enable_flags_t in)
{
  gnutls_cipher_algorithm_t cipher = gnutls_cipher_get(session);
  int version = gnutls_protocol_get_version(session);
  struct utsname utsname;
  char *endptr;
  long major, minor;
  gnutls_datum_t mac_key;
  gnutls_datum_t iv;
  gnutls_datum_t cipher_key;
  unsigned char seq_number[12];
  int sockin, sockout;
  int ret;

  ret = uname(&utsname);
  if (unlikely(ret < 0)) {
    return GNUTLS_E_INTERNAL_ERROR;
  }

  if (strcmp(utsname.sysname, "Linux") != 0) {
    return GNUTLS_E_INTERNAL_ERROR;
  }

  major = strtol(utsname.release, &endptr, 10);
  if (major < 0 || major == LONG_MAX || *endptr != '.') {
    return GNUTLS_E_INTERNAL_ERROR;
  }
  minor = strtol(endptr + 1, &endptr, 10);
  if (minor < 0 || minor == LONG_MAX || *endptr != '.') {
    return GNUTLS_E_INTERNAL_ERROR;
  }

  _gnutls_debug_log("Linux kernel version %lu.%lu has been detected\n",
        major, minor);

  /* setsockopt(SOL_TLS, TLS_RX) support added in 5.10 */
  if (major < 5 || (major == 5 && minor < 10)) {
    return GNUTLS_E_UNIMPLEMENTED_FEATURE;
  }

  /* check whether or not cipher suite supports ktls
   */
  switch (cipher) {
  case GNUTLS_CIPHER_AES_128_GCM:
  case GNUTLS_CIPHER_AES_256_GCM:
    break;
  case GNUTLS_CIPHER_AES_128_CCM:
  case GNUTLS_CIPHER_CHACHA20_POLY1305:
    /* AES-128-CCM and CHACHA20-POLY1305 can only be set
     * using setsockopt since 5.11.
     */
    if (major < 5 || (major == 5 && minor < 11)) {
      return GNUTLS_E_UNIMPLEMENTED_FEATURE;
    }
    break;
  default:
    return GNUTLS_E_UNIMPLEMENTED_FEATURE;
  }

  if (version < GNUTLS_TLS1_2) {
    return GNUTLS_E_UNIMPLEMENTED_FEATURE;
  }

  gnutls_transport_get_int2(session, &sockin, &sockout);

  ret = gnutls_record_get_state(session, 1, &mac_key, &iv, &cipher_key,
              seq_number);
  if (ret < 0) {
    return ret;
  }

  in &= session->internals.ktls_enabled;

  if (in & GNUTLS_KTLS_RECV) {
    switch (cipher) {
    case GNUTLS_CIPHER_AES_128_GCM: {
      struct tls12_crypto_info_aes_gcm_128 crypto_info;
      memset(&crypto_info, 0, sizeof(crypto_info));

      crypto_info.info.cipher_type = TLS_CIPHER_AES_GCM_128;
      assert(cipher_key.size ==
             TLS_CIPHER_AES_GCM_128_KEY_SIZE);

      /* for TLS 1.2 IV is generated in kernel */
      if (version == GNUTLS_TLS1_2) {
        crypto_info.info.version = TLS_1_2_VERSION;
        memcpy(crypto_info.iv, seq_number,
               TLS_CIPHER_AES_GCM_128_IV_SIZE);
      } else {
        crypto_info.info.version = TLS_1_3_VERSION;
        assert(iv.size ==
               TLS_CIPHER_AES_GCM_128_SALT_SIZE +
                 TLS_CIPHER_AES_GCM_128_IV_SIZE);

        memcpy(crypto_info.iv,
               iv.data +
                 TLS_CIPHER_AES_GCM_128_SALT_SIZE,
               TLS_CIPHER_AES_GCM_128_IV_SIZE);
      }

      memcpy(crypto_info.salt, iv.data,
             TLS_CIPHER_AES_GCM_128_SALT_SIZE);
      memcpy(crypto_info.rec_seq, seq_number,
             TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
      memcpy(crypto_info.key, cipher_key.data,
             TLS_CIPHER_AES_GCM_128_KEY_SIZE);

      if (setsockopt(sockin, SOL_TLS, TLS_RX, &crypto_info,
               sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_RECV;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }
    } break;
    case GNUTLS_CIPHER_AES_256_GCM: {
      struct tls12_crypto_info_aes_gcm_256 crypto_info;
      memset(&crypto_info, 0, sizeof(crypto_info));

      crypto_info.info.cipher_type = TLS_CIPHER_AES_GCM_256;
      assert(cipher_key.size ==
             TLS_CIPHER_AES_GCM_256_KEY_SIZE);

      /* for TLS 1.2 IV is generated in kernel */
      if (version == GNUTLS_TLS1_2) {
        crypto_info.info.version = TLS_1_2_VERSION;
        memcpy(crypto_info.iv, seq_number,
               TLS_CIPHER_AES_GCM_256_IV_SIZE);
      } else {
        crypto_info.info.version = TLS_1_3_VERSION;
        assert(iv.size ==
               TLS_CIPHER_AES_GCM_256_SALT_SIZE +
                 TLS_CIPHER_AES_GCM_256_IV_SIZE);

        memcpy(crypto_info.iv,
               iv.data +
                 TLS_CIPHER_AES_GCM_256_SALT_SIZE,
               TLS_CIPHER_AES_GCM_256_IV_SIZE);
      }

      memcpy(crypto_info.salt, iv.data,
             TLS_CIPHER_AES_GCM_256_SALT_SIZE);
      memcpy(crypto_info.rec_seq, seq_number,
             TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
      memcpy(crypto_info.key, cipher_key.data,
             TLS_CIPHER_AES_GCM_256_KEY_SIZE);

      if (setsockopt(sockin, SOL_TLS, TLS_RX, &crypto_info,
               sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_RECV;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }
    } break;
    case GNUTLS_CIPHER_AES_128_CCM: {
      struct tls12_crypto_info_aes_ccm_128 crypto_info;
      memset(&crypto_info, 0, sizeof(crypto_info));

      crypto_info.info.cipher_type = TLS_CIPHER_AES_CCM_128;
      assert(cipher_key.size ==
             TLS_CIPHER_AES_CCM_128_KEY_SIZE);

      /* for TLS 1.2 IV is generated in kernel */
      if (version == GNUTLS_TLS1_2) {
        crypto_info.info.version = TLS_1_2_VERSION;
        memcpy(crypto_info.iv, seq_number,
               TLS_CIPHER_AES_CCM_128_IV_SIZE);
      } else {
        crypto_info.info.version = TLS_1_3_VERSION;
        assert(iv.size ==
               TLS_CIPHER_AES_CCM_128_SALT_SIZE +
                 TLS_CIPHER_AES_CCM_128_IV_SIZE);

        memcpy(crypto_info.iv,
               iv.data +
                 TLS_CIPHER_AES_CCM_128_SALT_SIZE,
               TLS_CIPHER_AES_CCM_128_IV_SIZE);
      }

      memcpy(crypto_info.salt, iv.data,
             TLS_CIPHER_AES_CCM_128_SALT_SIZE);
      memcpy(crypto_info.rec_seq, seq_number,
             TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
      memcpy(crypto_info.key, cipher_key.data,
             TLS_CIPHER_AES_CCM_128_KEY_SIZE);

      if (setsockopt(sockin, SOL_TLS, TLS_RX, &crypto_info,
               sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_RECV;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }
    } break;
    case GNUTLS_CIPHER_CHACHA20_POLY1305: {
      struct tls12_crypto_info_chacha20_poly1305 crypto_info;
      memset(&crypto_info, 0, sizeof(crypto_info));

      crypto_info.info.cipher_type =
        TLS_CIPHER_CHACHA20_POLY1305;
      assert(cipher_key.size ==
             TLS_CIPHER_CHACHA20_POLY1305_KEY_SIZE);

      /* for TLS 1.2 IV is generated in kernel */
      if (version == GNUTLS_TLS1_2) {
        crypto_info.info.version = TLS_1_2_VERSION;
        memcpy(crypto_info.iv, seq_number,
               TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
      } else {
        crypto_info.info.version = TLS_1_3_VERSION;
        assert(iv.size ==
               TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE +
                 TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);

        memcpy(crypto_info.iv,
               iv.data +
                 TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE,
               TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
      }

      memcpy(crypto_info.salt, iv.data,
             TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE);
      memcpy(crypto_info.rec_seq, seq_number,
             TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE);
      memcpy(crypto_info.key, cipher_key.data,
             TLS_CIPHER_CHACHA20_POLY1305_KEY_SIZE);

      if (setsockopt(sockin, SOL_TLS, TLS_RX, &crypto_info,
               sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_RECV;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }
    } break;
    default:
      assert(0);
    }
  }

  ret = gnutls_record_get_state(session, 0, &mac_key, &iv, &cipher_key,
              seq_number);
  if (ret < 0) {
    return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
  }

  if (in & GNUTLS_KTLS_SEND) {
    switch (cipher) {
    case GNUTLS_CIPHER_AES_128_GCM: {
      struct tls12_crypto_info_aes_gcm_128 crypto_info;
      memset(&crypto_info, 0, sizeof(crypto_info));

      crypto_info.info.cipher_type = TLS_CIPHER_AES_GCM_128;

      assert(cipher_key.size ==
             TLS_CIPHER_AES_GCM_128_KEY_SIZE);

      /* for TLS 1.2 IV is generated in kernel */
      if (version == GNUTLS_TLS1_2) {
        crypto_info.info.version = TLS_1_2_VERSION;
        memcpy(crypto_info.iv, seq_number,
               TLS_CIPHER_AES_GCM_128_IV_SIZE);
      } else {
        crypto_info.info.version = TLS_1_3_VERSION;
        assert(iv.size ==
               TLS_CIPHER_AES_GCM_128_SALT_SIZE +
                 TLS_CIPHER_AES_GCM_128_IV_SIZE);

        memcpy(crypto_info.iv,
               iv.data +
                 TLS_CIPHER_AES_GCM_128_SALT_SIZE,
               TLS_CIPHER_AES_GCM_128_IV_SIZE);
      }

      memcpy(crypto_info.salt, iv.data,
             TLS_CIPHER_AES_GCM_128_SALT_SIZE);
      memcpy(crypto_info.rec_seq, seq_number,
             TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
      memcpy(crypto_info.key, cipher_key.data,
             TLS_CIPHER_AES_GCM_128_KEY_SIZE);

      if (setsockopt(sockout, SOL_TLS, TLS_TX, &crypto_info,
               sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_SEND;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }
    } break;
    case GNUTLS_CIPHER_AES_256_GCM: {
      struct tls12_crypto_info_aes_gcm_256 crypto_info;
      memset(&crypto_info, 0, sizeof(crypto_info));

      crypto_info.info.cipher_type = TLS_CIPHER_AES_GCM_256;
      assert(cipher_key.size ==
             TLS_CIPHER_AES_GCM_256_KEY_SIZE);

      /* for TLS 1.2 IV is generated in kernel */
      if (version == GNUTLS_TLS1_2) {
        crypto_info.info.version = TLS_1_2_VERSION;
        memcpy(crypto_info.iv, seq_number,
               TLS_CIPHER_AES_GCM_256_IV_SIZE);
      } else {
        crypto_info.info.version = TLS_1_3_VERSION;
        assert(iv.size ==
               TLS_CIPHER_AES_GCM_256_SALT_SIZE +
                 TLS_CIPHER_AES_GCM_256_IV_SIZE);

        memcpy(crypto_info.iv,
               iv.data +
                 TLS_CIPHER_AES_GCM_256_SALT_SIZE,
               TLS_CIPHER_AES_GCM_256_IV_SIZE);
      }

      memcpy(crypto_info.salt, iv.data,
             TLS_CIPHER_AES_GCM_256_SALT_SIZE);
      memcpy(crypto_info.rec_seq, seq_number,
             TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
      memcpy(crypto_info.key, cipher_key.data,
             TLS_CIPHER_AES_GCM_256_KEY_SIZE);

      if (setsockopt(sockout, SOL_TLS, TLS_TX, &crypto_info,
               sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_SEND;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }
    } break;
    case GNUTLS_CIPHER_AES_128_CCM: {
      struct tls12_crypto_info_aes_ccm_128 crypto_info;
      memset(&crypto_info, 0, sizeof(crypto_info));

      crypto_info.info.cipher_type = TLS_CIPHER_AES_CCM_128;
      assert(cipher_key.size ==
             TLS_CIPHER_AES_CCM_128_KEY_SIZE);

      /* for TLS 1.2 IV is generated in kernel */
      if (version == GNUTLS_TLS1_2) {
        crypto_info.info.version = TLS_1_2_VERSION;
        memcpy(crypto_info.iv, seq_number,
               TLS_CIPHER_AES_CCM_128_IV_SIZE);
      } else {
        crypto_info.info.version = TLS_1_3_VERSION;
        assert(iv.size ==
               TLS_CIPHER_AES_CCM_128_SALT_SIZE +
                 TLS_CIPHER_AES_CCM_128_IV_SIZE);

        memcpy(crypto_info.iv,
               iv.data +
                 TLS_CIPHER_AES_CCM_128_SALT_SIZE,
               TLS_CIPHER_AES_CCM_128_IV_SIZE);
      }

      memcpy(crypto_info.salt, iv.data,
             TLS_CIPHER_AES_CCM_128_SALT_SIZE);
      memcpy(crypto_info.rec_seq, seq_number,
             TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
      memcpy(crypto_info.key, cipher_key.data,
             TLS_CIPHER_AES_CCM_128_KEY_SIZE);

      if (setsockopt(sockout, SOL_TLS, TLS_TX, &crypto_info,
               sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_SEND;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }
    } break;
    case GNUTLS_CIPHER_CHACHA20_POLY1305: {
      struct tls12_crypto_info_chacha20_poly1305 crypto_info;
      memset(&crypto_info, 0, sizeof(crypto_info));

      crypto_info.info.cipher_type =
        TLS_CIPHER_CHACHA20_POLY1305;
      assert(cipher_key.size ==
             TLS_CIPHER_CHACHA20_POLY1305_KEY_SIZE);

      /* for TLS 1.2 IV is generated in kernel */
      if (version == GNUTLS_TLS1_2) {
        crypto_info.info.version = TLS_1_2_VERSION;
        memcpy(crypto_info.iv, seq_number,
               TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
      } else {
        crypto_info.info.version = TLS_1_3_VERSION;
        assert(iv.size ==
               TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE +
                 TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);

        memcpy(crypto_info.iv,
               iv.data +
                 TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE,
               TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
      }

      memcpy(crypto_info.salt, iv.data,
             TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE);
      memcpy(crypto_info.rec_seq, seq_number,
             TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE);
      memcpy(crypto_info.key, cipher_key.data,
             TLS_CIPHER_CHACHA20_POLY1305_KEY_SIZE);

      if (setsockopt(sockout, SOL_TLS, TLS_TX, &crypto_info,
               sizeof(crypto_info))) {
        session->internals.ktls_enabled &=
          ~GNUTLS_KTLS_SEND;
        return gnutls_assert_val(
          GNUTLS_E_INTERNAL_ERROR);
      }
    } break;
    default:
      assert(0);
    }

    // set callback for sending handshake messages
    gnutls_handshake_set_read_function(
      session, _gnutls_ktls_send_handshake_msg);

    // set callback for sending alert messages
    gnutls_alert_set_read_function(session,
                 _gnutls_ktls_send_alert_msg);
  }

  return in;
}
#endif

ssize_t _gnutls_ktls_send_file(gnutls_session_t session, int fd, off_t *offset,
             size_t count)
{
  ssize_t ret;
  int sockin, sockout;

  assert(session != NULL);
#if defined(__FreeBSD__)
  off_t sbytes = 0;
  assert(offset != NULL);
#endif

  gnutls_transport_get_int2(session, &sockin, &sockout);
#if defined(__FreeBSD__)
  ret = sendfile(fd, sockout, *offset, count, NULL, &sbytes, 0);
#else
  ret = sendfile(sockout, fd, offset, count);
#endif
  if (ret == -1) {
    switch (errno) {
    case EINTR:
      return GNUTLS_E_INTERRUPTED;
    case EAGAIN:
      return GNUTLS_E_AGAIN;
    default:
      return GNUTLS_E_PUSH_ERROR;
    }
  }
#if defined(__FreeBSD__)
  *offset += sbytes; /* follow linux sendfile behavior */
  return sbytes;
#else
  return ret;
#endif
}

int _gnutls_ktls_send_control_msg(gnutls_session_t session,
          unsigned char record_type, const void *data,
          size_t data_size)
{
  const char *buf = data;
  ssize_t ret;
  int sockin, sockout;
  size_t data_to_send = data_size;

  assert(session != NULL);

  gnutls_transport_get_int2(session, &sockin, &sockout);

  while (data_to_send > 0) {
    char cmsg[CMSG_SPACE(sizeof(unsigned char))];
    struct msghdr msg = { 0 };
    struct iovec msg_iov; /* Vector of data to send/receive into. */
    struct cmsghdr *hdr;

    msg.msg_control = cmsg;
    msg.msg_controllen = sizeof cmsg;

    hdr = CMSG_FIRSTHDR(&msg);
#if defined(__FreeBSD__)
    hdr->cmsg_level = IPPROTO_TCP;
#else
    hdr->cmsg_level = SOL_TLS;
#endif
    hdr->cmsg_type = TLS_SET_RECORD_TYPE;
    hdr->cmsg_len = CMSG_LEN(sizeof(unsigned char));

    // construct record header
    *CMSG_DATA(hdr) = record_type;
    msg.msg_controllen = hdr->cmsg_len;

    msg_iov.iov_base = (void *)buf;
    msg_iov.iov_len = data_to_send;

    msg.msg_iov = &msg_iov;
    msg.msg_iovlen = 1;

    ret = sendmsg(sockout, &msg, MSG_DONTWAIT);

    if (ret == -1) {
      switch (errno) {
      case EINTR:
        if (data_to_send < data_size) {
          return data_size - data_to_send;
        } else {
          return GNUTLS_E_INTERRUPTED;
        }
      case EAGAIN:
        if (data_to_send < data_size) {
          return data_size - data_to_send;
        } else {
          return GNUTLS_E_AGAIN;
        }
      default:
        return GNUTLS_E_PUSH_ERROR;
      }
    }

    buf += ret;
    data_to_send -= ret;
  }

  return data_size;
}

int _gnutls_ktls_send_handshake_msg(gnutls_session_t session,
            gnutls_record_encryption_level_t level,
            gnutls_handshake_description_t htype,
            const void *data, size_t data_size)
{
  return _gnutls_ktls_send_control_msg(session, GNUTLS_HANDSHAKE, data,
               data_size);
}

int _gnutls_ktls_send_alert_msg(gnutls_session_t session,
        gnutls_record_encryption_level_t level,
        gnutls_alert_level_t alert_level,
        gnutls_alert_description_t alert_desc)
{
  uint8_t data[2];
  data[0] = (uint8_t)alert_level;
  data[1] = (uint8_t)alert_desc;
  return _gnutls_ktls_send_control_msg(session, GNUTLS_ALERT, data, 2);
}

int _gnutls_ktls_recv_control_msg(gnutls_session_t session,
          unsigned char *record_type, void *data,
          size_t data_size)
{
  char *buf = data;
  ssize_t ret;
  int sockin, sockout;

  char cmsg[CMSG_SPACE(sizeof(unsigned char))];
  struct msghdr msg = { 0 };
  struct iovec msg_iov;
  struct cmsghdr *hdr;

  assert(session != NULL);

  gnutls_transport_get_int2(session, &sockin, &sockout);

  if (session->internals.read_eof != 0) {
    return 0;
  } else if (session->internals.invalid_connection != 0 ||
       session->internals.may_not_read != 0)
    return GNUTLS_E_INVALID_SESSION;

  /* receive message */
  msg.msg_control = cmsg;
  msg.msg_controllen = sizeof cmsg;

  msg_iov.iov_base = buf;
  msg_iov.iov_len = data_size;

  msg.msg_iov = &msg_iov;
  msg.msg_iovlen = 1;

  ret = recvmsg(sockin, &msg, MSG_DONTWAIT);

  if (ret == -1) {
    switch (errno) {
    case EAGAIN:
      return GNUTLS_E_AGAIN;
    case EINVAL:
      return GNUTLS_E_UNSUPPORTED_VERSION_PACKET;
    case EMSGSIZE:
      return GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
    case EBADMSG:
      return GNUTLS_E_DECRYPTION_FAILED;
    default:
      return GNUTLS_E_PULL_ERROR;
    }
  }

  /* connection closed */
  if (ret == 0)
    return 0;

  /* get record type from header */
  hdr = CMSG_FIRSTHDR(&msg);
  if (hdr == NULL) {
    return GNUTLS_E_PULL_ERROR;
  }
#if defined(__FreeBSD__)
  if (hdr->cmsg_level == IPPROTO_TCP && hdr->cmsg_type == TLS_GET_RECORD)
#else
  if (hdr->cmsg_level == SOL_TLS && hdr->cmsg_type == TLS_GET_RECORD_TYPE)
#endif
    *record_type = *(unsigned char *)CMSG_DATA(hdr);
  else
    *record_type = GNUTLS_APPLICATION_DATA;

  return ret;
}

int _gnutls_ktls_recv_int(gnutls_session_t session, content_type_t type,
        void *data, size_t data_size)
{
  unsigned char record_type;
  int ret;

  ret = _gnutls_ktls_recv_control_msg(session, &record_type, data,
              data_size);

  if (ret > 0) {
    switch (record_type) {
    case GNUTLS_CHANGE_CIPHER_SPEC:
      return gnutls_assert_val(
        GNUTLS_E_UNIMPLEMENTED_FEATURE);
      break;
    case GNUTLS_ALERT:
      session_invalidate(session);
      ret = 0;
      break;
    case GNUTLS_HANDSHAKE:
      ret = gnutls_handshake_write(
        session, GNUTLS_ENCRYPTION_LEVEL_APPLICATION,
        data, ret);

      if (ret < 0)
        return gnutls_assert_val(ret);

      if (type != record_type)
        return GNUTLS_E_AGAIN;
      break;
    case GNUTLS_APPLICATION_DATA:
      if (type != record_type)
        ret = GNUTLS_E_GOT_APPLICATION_DATA;
      break;
    case GNUTLS_HEARTBEAT:
      break;
    default:
      gnutls_assert();
      return GNUTLS_E_UNEXPECTED_PACKET;
    }
  }
  return ret;
}
#else //ENABLE_KTLS
gnutls_transport_ktls_enable_flags_t
gnutls_transport_is_ktls_enabled(gnutls_session_t session)
{
  return 0;
}

void _gnutls_ktls_enable(gnutls_session_t session)
{
}

int _gnutls_ktls_set_keys(gnutls_session_t sessioni,
        gnutls_transport_ktls_enable_flags_t in)
{
  return gnutls_assert_val(GNUTLS_E_UNIMPLEMENTED_FEATURE);
}

ssize_t _gnutls_ktls_send_file(gnutls_session_t session, int fd, off_t *offset,
             size_t count)
{
  return gnutls_assert_val(GNUTLS_E_UNIMPLEMENTED_FEATURE);
}

int _gnutls_ktls_send_control_msg(gnutls_session_t session,
          unsigned char record_type, const void *data,
          size_t data_size)
{
  return gnutls_assert_val(GNUTLS_E_UNIMPLEMENTED_FEATURE);
}

int _gnutls_ktls_send_handshake_msg(gnutls_session_t session,
            gnutls_record_encryption_level_t level,
            gnutls_handshake_description_t htype,
            const void *data, size_t data_size)
{
  (void)level;
  return gnutls_assert_val(GNUTLS_E_UNIMPLEMENTED_FEATURE);
}

int _gnutls_ktls_recv_int(gnutls_session_t session, content_type_t type,
        void *data, size_t data_size)
{
  return gnutls_assert_val(GNUTLS_E_UNIMPLEMENTED_FEATURE);
}

#endif //ENABLE_KTLS

Coverage Report

Created: 2025-03-06 06:58