#endif /* DTLS_PSK */
}
-/** returns true if the cipher matches TLS_ECDH_anon_WITH_AES_128_CBC_SHA */
-static inline int is_tls_ecdh_anon_with_aes_128_cbc_sha(dtls_cipher_t cipher)
+/** returns true if the cipher matches TLS_ECDH_anon_WITH_AES_128_CBC_SHA_256 */
+static inline int is_tls_ecdh_anon_with_aes_128_cbc_sha_256(dtls_cipher_t cipher)
{
#ifdef DTLS_ECC
- return cipher == TLS_ECDH_anon_WITH_AES_128_CBC_SHA;
+ return cipher == TLS_ECDH_anon_WITH_AES_128_CBC_SHA_256;
#else
return 0;
#endif
}
+/** returns true if the cipher matches TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA_256 */
+static inline int is_tls_ecdhe_psk_with_aes_128_cbc_sha_256(dtls_cipher_t cipher)
+{
+#if defined(DTLS_ECC) && defined(DTLS_PSK)
+ return cipher == TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA_256;
+#else
+ return 0;
+#endif /* defined(DTLS_PSK) && defined(DTLS_ECC) */
+}
+
+
/** returns true if the application is configured for psk */
static inline int is_psk_supported(dtls_context_t *ctx)
#endif
}
+/** returns true if ecdhe_psk_with_aes_128_cbc_sha_256 is supported */
+static inline int is_ecdhe_psk_supported(dtls_context_t *ctx)
+{
+#if defined(DTLS_ECC) && defined(DTLS_PSK)
+ return is_psk_supported(ctx);
+#else
+ return 0;
+#endif /* defined(DTLS_PSK) && defined(DTLS_ECC) */
+}
+
+
/**
* Returns @c 1 if @p code is a cipher suite other than @c
* TLS_NULL_WITH_NULL_NULL that we recognize.
int psk;
int ecdsa;
int ecdh_anon;
+ int ecdhe_psk;
psk = is_psk_supported(ctx);
ecdsa = is_ecdsa_supported(ctx, is_client);
ecdh_anon = is_ecdh_anon_supported(ctx);
+ ecdhe_psk = is_ecdhe_psk_supported(ctx);
return (psk && is_tls_psk_with_aes_128_ccm_8(code)) ||
(ecdsa && is_tls_ecdhe_ecdsa_with_aes_128_ccm_8(code)) ||
- (ecdh_anon && is_tls_ecdh_anon_with_aes_128_cbc_sha(code));
+ (ecdh_anon && is_tls_ecdh_anon_with_aes_128_cbc_sha_256(code)) ||
+ (ecdhe_psk && is_tls_ecdhe_psk_with_aes_128_cbc_sha_256(code));
}
/**
dtls_peer_t *peer,
session_t *session,
dtls_peer_type role) {
- unsigned char *pre_master_secret;
+#if defined(DTLS_PSK) && defined(DTLS_ECC)
+ unsigned char pre_master_secret[MAX_KEYBLOCK_LENGTH + uECC_BYTES];
+#else
+ unsigned char pre_master_secret[MAX_KEYBLOCK_LENGTH];
+#endif /* defined(DTLS_PSK) && defined(DTLS_ECC) */
int pre_master_len = 0;
dtls_security_parameters_t *security = dtls_security_params_next(peer);
uint8 master_secret[DTLS_MASTER_SECRET_LENGTH];
return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
}
- pre_master_secret = security->key_block;
-
switch (handshake->cipher) {
#ifdef DTLS_PSK
case TLS_PSK_WITH_AES_128_CCM_8: {
#endif /* DTLS_PSK */
#ifdef DTLS_ECC
case TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8:
- case TLS_ECDH_anon_WITH_AES_128_CBC_SHA: {
+ case TLS_ECDH_anon_WITH_AES_128_CBC_SHA_256: {
pre_master_len = dtls_ecdh_pre_master_secret(handshake->keyx.ecc.own_eph_priv,
handshake->keyx.ecc.other_eph_pub_x,
handshake->keyx.ecc.other_eph_pub_y,
break;
}
#endif /* DTLS_ECC */
+#if defined(DTLS_PSK) && defined(DTLS_ECC)
+ case TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA_256: {
+ unsigned char psk[DTLS_PSK_MAX_KEY_LEN];
+ int psklen;
+
+ psklen = CALL(ctx, get_psk_info, session, DTLS_PSK_KEY,
+ handshake->keyx.psk.identity,
+ handshake->keyx.psk.id_length,
+ psk, DTLS_PSK_MAX_KEY_LEN);
+ if (psklen < 0) {
+ dtls_crit("no psk key for session available\n");
+ return psklen;
+ }
+
+ pre_master_len = dtls_ecdhe_psk_pre_master_secret(psk, psklen,
+ handshake->keyx.ecc.own_eph_priv,
+ handshake->keyx.ecc.other_eph_pub_x,
+ handshake->keyx.ecc.other_eph_pub_y,
+ sizeof(handshake->keyx.ecc.own_eph_priv),
+ pre_master_secret,
+ MAX_KEYBLOCK_LENGTH + uECC_BYTES);
+
+ if (pre_master_len < 0) {
+ dtls_crit("the curve was too long, for the pre master secret\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
+ }
+ break;
+ }
+#endif /* defined(DTLS_PSK) && defined(DTLS_ECC) */
default:
dtls_crit("calculate_key_block: unknown cipher\n");
return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
#ifdef DTLS_ECC
if (is_tls_ecdhe_ecdsa_with_aes_128_ccm_8(handshake->cipher) ||
- is_tls_ecdh_anon_with_aes_128_cbc_sha(handshake->cipher) ) {
+ is_tls_ecdh_anon_with_aes_128_cbc_sha_256(handshake->cipher) ) {
if (length < DTLS_HS_LENGTH + DTLS_CKXEC_LENGTH) {
dtls_debug("The client key exchange is too short\n");
data += sizeof(handshake->keyx.ecc.other_eph_pub_y);
}
#endif /* DTLS_ECC */
+#if defined(DTLS_PSK) && defined(DTLS_ECC)
+ if (is_tls_ecdhe_psk_with_aes_128_cbc_sha_256(handshake->cipher)) {
+ int id_length;
+
+ if (length < DTLS_HS_LENGTH + DTLS_CKXEC_LENGTH) {
+ dtls_debug("The client key exchange is too short\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_HANDSHAKE_FAILURE);
+ }
+ data += DTLS_HS_LENGTH;
+
+ //PSK hint
+ id_length = dtls_uint16_to_int(data);
+ data += sizeof(uint16);
+
+ if (DTLS_HS_LENGTH + DTLS_CKXPSK_LENGTH_MIN + DTLS_CKXEC_LENGTH + id_length != length) {
+ dtls_debug("The identity has a wrong length\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_HANDSHAKE_FAILURE);
+ }
+
+ if (id_length > DTLS_PSK_MAX_CLIENT_IDENTITY_LEN) {
+ dtls_warn("please use a smaller client identity\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
+ }
+
+ handshake->keyx.psk.id_length = id_length;
+ memcpy(handshake->keyx.psk.identity, data, id_length);
+ data += id_length;
+
+ //ECDH public
+ if (dtls_uint8_to_int(data) != 1 + 2 * DTLS_EC_KEY_SIZE) {
+ dtls_alert("expected 65 bytes long public point\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_HANDSHAKE_FAILURE);
+ }
+ data += sizeof(uint8);
+
+ if (dtls_uint8_to_int(data) != 4) {
+ dtls_alert("expected uncompressed public point\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_HANDSHAKE_FAILURE);
+ }
+ data += sizeof(uint8);
+
+ memcpy(handshake->keyx.ecc.other_eph_pub_x, data,
+ sizeof(handshake->keyx.ecc.other_eph_pub_x));
+ data += sizeof(handshake->keyx.ecc.other_eph_pub_x);
+
+ memcpy(handshake->keyx.ecc.other_eph_pub_y, data,
+ sizeof(handshake->keyx.ecc.other_eph_pub_y));
+ data += sizeof(handshake->keyx.ecc.other_eph_pub_y);
+ }
+#endif /* defined(DTLS_PSK) && defined(DTLS_ECC) */
#ifdef DTLS_PSK
if (is_tls_psk_with_aes_128_ccm_8(handshake->cipher)) {
int id_length;
p += data_len_array[i];
res += data_len_array[i];
}
+ } else if (is_tls_ecdh_anon_with_aes_128_cbc_sha_256(security->cipher) ||
+ is_tls_ecdhe_psk_with_aes_128_cbc_sha_256(security->cipher)) {
+
+ unsigned char nonce[DTLS_CBC_IV_LENGTH];
+
+ /** Add IV into body of packet in case of AES CBC mode according to RFC 5246, Section 6.2.3.2
+ *
+ * opaque IV[SecurityParameters.record_iv_length];
+ * block-ciphered struct {
+ * opaque content[TLSCompressed.length];
+ * opaque MAC[SecurityParameters.mac_length];
+ * uint8 padding[GenericBlockCipher.padding_length];
+ * uint8 padding_length;
+ * };
+ *
+ */
+
+ res = 0;
+ dtls_prng(nonce, DTLS_CBC_IV_LENGTH);
+ memcpy(p , nonce, DTLS_CBC_IV_LENGTH);
+ p += DTLS_CBC_IV_LENGTH;
+ res += DTLS_CBC_IV_LENGTH;
+
+ for (i = 0; i < data_array_len; i++) {
+ /* check the minimum that we need for packets that are not encrypted */
+ if (*rlen < res + DTLS_RH_LENGTH + data_len_array[i]) {
+ dtls_debug("dtls_prepare_record: send buffer too small\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
+ }
+
+ memcpy(p, data_array[i], data_len_array[i]);
+ p += data_len_array[i];
+ res += data_len_array[i];
+ }
+
+ res = dtls_encrypt(start + DTLS_CBC_IV_LENGTH, res - DTLS_CBC_IV_LENGTH,
+ start + DTLS_CBC_IV_LENGTH, nonce,
+ dtls_kb_local_write_key(security, peer->role),
+ dtls_kb_key_size(security, peer->role),
+ NULL, 0,
+ security->cipher);
+ if (res < 0)
+ return res;
+
+ res += DTLS_CBC_IV_LENGTH;
+
} else { /* TLS_PSK_WITH_AES_128_CCM_8 or TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8 */
/**
* length of additional_data for the AEAD cipher which consists of
dtls_debug("dtls_prepare_record(): encrypt using TLS_PSK_WITH_AES_128_CCM_8\n");
} else if (is_tls_ecdhe_ecdsa_with_aes_128_ccm_8(security->cipher)) {
dtls_debug("dtls_prepare_record(): encrypt using TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8\n");
- } else if (is_tls_ecdh_anon_with_aes_128_cbc_sha(security->cipher)) {
- dtls_debug("dtls_prepare_record() : encrypt using TLS_ECDH_anon_WITH_AES_128_CBC_SHA\n");
} else {
dtls_debug("dtls_prepare_record(): encrypt using unknown cipher\n");
}
memset(nonce, 0, DTLS_CCM_BLOCKSIZE);
memcpy(nonce, dtls_kb_local_iv(security, peer->role),
- dtls_kb_iv_size(security, peer->role));
+ dtls_kb_iv_size(security, peer->role));
memcpy(nonce + dtls_kb_iv_size(security, peer->role), start, 8); /* epoch + seq_num */
dtls_debug_dump("nonce:", nonce, DTLS_CCM_BLOCKSIZE);
memcpy(A_DATA, &DTLS_RECORD_HEADER(sendbuf)->epoch, 8); /* epoch and seq_num */
memcpy(A_DATA + 8, &DTLS_RECORD_HEADER(sendbuf)->content_type, 3); /* type and version */
dtls_int_to_uint16(A_DATA + 11, res - 8); /* length */
-
+
+
res = dtls_encrypt(start + 8, res - 8, start + 8, nonce,
dtls_kb_local_write_key(security, peer->role),
dtls_kb_key_size(security, peer->role),
if (res < 0)
return res;
- res += 8; /* increment res by size of nonce_explicit */
+ res += 8; /* increment res by size of nonce_explicit */
dtls_debug_dump("message:", start, res);
}
}
#endif /* DTLS_ECC */
+#if defined(DTLS_PSK) && defined(DTLS_ECC)
+static int dtls_send_server_key_exchange_ecdhe_psk(dtls_context_t *ctx, dtls_peer_t *peer,
+ const unsigned char *psk_hint, size_t psk_hint_len)
+{
+ /* The ASN.1 Integer representation of an 32 byte unsigned int could be
+ * 33 bytes long add space for that */
+ uint8 buf[DTLS_SKEXEC_LENGTH + DTLS_SKEXECPSK_LENGTH_MAX + 2];
+ uint8 *p;
+ uint8 *ephemeral_pub_x;
+ uint8 *ephemeral_pub_y;
+ dtls_handshake_parameters_t *config = peer->handshake_params;
+
+ /* ServerKeyExchange
+ * Please see Session 2, RFC 5489.
+
+ struct {
+ select (KeyExchangeAlgorithm) {
+ //other cases for rsa, diffie_hellman, etc.
+ case ec_diffie_hellman_psk: // NEW
+ opaque psk_identity_hint<0..2^16-1>;
+ ServerECDHParams params;
+ };
+ } ServerKeyExchange; */
+ p = buf;
+
+ assert(psk_hint_len <= DTLS_PSK_MAX_CLIENT_IDENTITY_LEN);
+ if (psk_hint_len > DTLS_PSK_MAX_CLIENT_IDENTITY_LEN) {
+ // should never happen
+ dtls_warn("psk identity hint is too long\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
+ }
+
+ // psk_identity_hint
+ dtls_int_to_uint16(p, psk_hint_len);
+ p += sizeof(uint16);
+
+ memcpy(p, psk_hint, psk_hint_len);
+ p += psk_hint_len;
+
+ /* ServerECDHParams. */
+ /* ECCurveType curve_type: named_curve */
+ dtls_int_to_uint8(p, TLS_EC_CURVE_TYPE_NAMED_CURVE);
+ p += sizeof(uint8);
+
+ /* NamedCurve namedcurve: secp256r1 */
+ dtls_int_to_uint16(p, TLS_EXT_ELLIPTIC_CURVES_SECP256R1);
+ p += sizeof(uint16);
+
+ dtls_int_to_uint8(p, 1 + 2 * DTLS_EC_KEY_SIZE);
+ p += sizeof(uint8);
+
+ /* This should be an uncompressed point, but I do not have access to the spec. */
+ dtls_int_to_uint8(p, 4);
+ p += sizeof(uint8);
+
+ /* store the pointer to the x component of the pub key and make space */
+ ephemeral_pub_x = p;
+ p += DTLS_EC_KEY_SIZE;
+
+ /* store the pointer to the y component of the pub key and make space */
+ ephemeral_pub_y = p;
+ p += DTLS_EC_KEY_SIZE;
+
+ dtls_ecdsa_generate_key(config->keyx.ecc.own_eph_priv,
+ ephemeral_pub_x, ephemeral_pub_y,
+ DTLS_EC_KEY_SIZE);
+
+ assert(p - buf <= sizeof(buf));
+
+ return dtls_send_handshake_msg(ctx, peer, DTLS_HT_SERVER_KEY_EXCHANGE,
+ buf, p - buf);
+}
+#endif /* defined(DTLS_PSK) && defined(DTLS_ECC) */
+
#ifdef DTLS_PSK
static int
dtls_send_server_key_exchange_psk(dtls_context_t *ctx, dtls_peer_t *peer,
int res;
int ecdsa;
int ecdh_anon;
+ int ecdhe_psk;
res = dtls_send_server_hello(ctx, peer);
}
ecdsa = is_tls_ecdhe_ecdsa_with_aes_128_ccm_8(peer->handshake_params->cipher);
- ecdh_anon = is_tls_ecdh_anon_with_aes_128_cbc_sha(peer->handshake_params->cipher);
+ ecdh_anon = is_tls_ecdh_anon_with_aes_128_cbc_sha_256(peer->handshake_params->cipher);
+ ecdhe_psk = is_tls_ecdhe_psk_with_aes_128_cbc_sha_256(peer->handshake_params->cipher);
#ifdef DTLS_ECC
if(ecdh_anon) {
}
}
#endif /* DTLS_ECC */
+#if defined(DTLS_PSK) && defined(DTLS_ECC)
+ else if(ecdhe_psk) {
+ unsigned char psk_hint[DTLS_PSK_MAX_CLIENT_IDENTITY_LEN];
+ int psk_len;
+ /* The identity hint is optional, therefore we ignore the result
+ * and check psk only. */
+ psk_len = CALL(ctx, get_psk_info, &peer->session, DTLS_PSK_HINT,
+ NULL, 0, psk_hint, DTLS_PSK_MAX_CLIENT_IDENTITY_LEN);
+
+ if (psk_len < 0) {
+ dtls_debug("dtls_server_hello: cannot create ServerKeyExchange\n");
+ return psk_len;
+ }
+
+ if (psk_len > 0) {
+ res = dtls_send_server_key_exchange_ecdhe_psk(ctx, peer, psk_hint, (size_t)psk_len);
+
+ if (res < 0) {
+ dtls_debug("dtls_server_hello(with ECDHE): cannot prepare Server Key Exchange record\n");
+ return res;
+ }
+ }
+ }
+#endif /* defined(DTLS_PSK) && defined(DTLS_ECC) */
#ifdef DTLS_PSK
if (is_tls_psk_with_aes_128_ccm_8(peer->handshake_params->cipher)) {
unsigned char psk_hint[DTLS_PSK_MAX_CLIENT_IDENTITY_LEN];
static int
dtls_send_client_key_exchange(dtls_context_t *ctx, dtls_peer_t *peer)
{
+#if defined(DTLS_PSK) && defined(DTLS_ECC)
+ uint8 buf[DTLS_CKXEC_LENGTH + 2 + DTLS_PSK_MAX_CLIENT_IDENTITY_LEN];
+#else
uint8 buf[DTLS_CKXEC_LENGTH];
+#endif /* defined(DTLS_PSK) && defined(DTLS_ECC) */
uint8 client_id[DTLS_PSK_MAX_CLIENT_IDENTITY_LEN];
uint8 *p;
dtls_handshake_parameters_t *handshake = peer->handshake_params;
#endif /* DTLS_PSK */
#ifdef DTLS_ECC
case TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8:
- case TLS_ECDH_anon_WITH_AES_128_CBC_SHA: {
+ case TLS_ECDH_anon_WITH_AES_128_CBC_SHA_256: {
uint8 *ephemeral_pub_x;
uint8 *ephemeral_pub_y;
break;
}
#endif /* DTLS_ECC */
+#if defined(DTLS_PSK) && defined(DTLS_ECC)
+ case TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA_256: {
+ int psk_len;
+ uint8 *ephemeral_pub_x;
+ uint8 *ephemeral_pub_y;
+
+ /* Please see Session 2, RFC 5489.
+ struct {
+ select (KeyExchangeAlgorithm) {
+ // other cases for rsa, diffie_hellman, etc.
+ case ec_diffie_hellman_psk:
+ opaque psk_identity<0..2^16-1>;
+ ClientECDiffieHellmanPublic public;
+ } exchange_keys;
+ } ClientKeyExchange;
+ */
+
+ psk_len = CALL(ctx, get_psk_info, &peer->session, DTLS_PSK_IDENTITY,
+ NULL, 0,
+ client_id,
+ sizeof(client_id));
+ if (psk_len < 0) {
+ dtls_crit("no psk identity set in kx\n");
+ return psk_len;
+ }
+
+ if (psk_len + sizeof(uint16) > DTLS_CKXEC_LENGTH) {
+ dtls_warn("the psk identity is too long\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
+ }
+
+ dtls_int_to_uint16(p, psk_len);
+ p += sizeof(uint16);
+
+ memcpy(p, client_id, psk_len);
+ p += psk_len;
+
+ dtls_int_to_uint8(p, 1 + 2 * DTLS_EC_KEY_SIZE);
+ p += sizeof(uint8);
+
+ dtls_int_to_uint8(p, 4);
+ p += sizeof(uint8);
+
+ ephemeral_pub_x = p;
+ p += DTLS_EC_KEY_SIZE;
+ ephemeral_pub_y = p;
+ p += DTLS_EC_KEY_SIZE;
+
+ dtls_ecdsa_generate_key(peer->handshake_params->keyx.ecc.own_eph_priv,
+ ephemeral_pub_x, ephemeral_pub_y,
+ DTLS_EC_KEY_SIZE);
+ break;
+ }
+#endif /* defined(DTLS_PSK) && defined(DTLS_ECC) */
default:
dtls_crit("cipher not supported\n");
return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
int psk = 0;
int ecdsa = 0;
int ecdh_anon = 0;
+ int ecdhe_psk = 0;
dtls_handshake_parameters_t *handshake = peer->handshake_params;
dtls_tick_t now;
case TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8:
ecdsa = is_ecdsa_supported(ctx, 1);
break;
- case TLS_ECDH_anon_WITH_AES_128_CBC_SHA:
+ case TLS_ECDH_anon_WITH_AES_128_CBC_SHA_256:
ecdh_anon = is_ecdh_anon_supported(ctx);
break;
+ case TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA_256:
+ ecdhe_psk = is_ecdhe_psk_supported(ctx);
+ break;
default:
psk = is_psk_supported(ctx);
ecdsa = is_ecdsa_supported(ctx, 1);
ecdh_anon = is_ecdh_anon_supported(ctx);
+ ecdhe_psk = is_ecdhe_psk_supported(ctx);
break;
}
- cipher_size = 2 + (ecdsa ? 2 : 0) + (psk ? 2 : 0) + (ecdh_anon ? 2 : 0);
+ cipher_size = 2 + (ecdsa ? 2 : 0) + (psk ? 2 : 0) + (ecdh_anon ? 2 : 0) + (ecdhe_psk ? 2 : 0);
extension_size = (ecdsa) ? (2 + 6 + 6 + 8 + 6) : 0;
if (cipher_size == 0) {
p += sizeof(uint16);
if (ecdh_anon) {
- dtls_int_to_uint16(p, TLS_ECDH_anon_WITH_AES_128_CBC_SHA);
+ dtls_int_to_uint16(p, TLS_ECDH_anon_WITH_AES_128_CBC_SHA_256);
p += sizeof(uint16);
}
if (psk) {
dtls_int_to_uint16(p, TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8);
p += sizeof(uint16);
}
+ if (ecdhe_psk) {
+ dtls_int_to_uint16(p, TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA_256);
+ p += sizeof(uint16);
+ }
/* compression method */
dtls_int_to_uint8(p, 1);
update_hs_hash(peer, data, data_length);
- assert(is_tls_ecdh_anon_with_aes_128_cbc_sha(config->cipher));
+ assert(is_tls_ecdh_anon_with_aes_128_cbc_sha_256(config->cipher));
data += DTLS_HS_LENGTH;
return 0;
}
-
#endif /* DTLS_ECC */
+#if defined(DTLS_PSK) && defined(DTLS_ECC)
+check_server_key_exchange_ecdhe_psk(dtls_context_t *ctx,
+ dtls_peer_t *peer,
+ uint8 *data, size_t data_length)
+{
+ dtls_handshake_parameters_t *config = peer->handshake_params;
+ uint16_t psk_len = 0;
+
+ /* ServerKeyExchange
+ * Please see Session 2, RFC 5489.
+
+ struct {
+ select (KeyExchangeAlgorithm) {
+ //other cases for rsa, diffie_hellman, etc.
+ case ec_diffie_hellman_psk: // NEW
+ opaque psk_identity_hint<0..2^16-1>;
+ ServerECDHParams params;
+ };
+ } ServerKeyExchange; */
+
+ update_hs_hash(peer, data, data_length);
+
+ assert(is_tls_ecdhe_psk_with_aes_128_cbc_sha_256(config->cipher));
+
+ data += DTLS_HS_LENGTH;
+
+ psk_len = dtls_uint16_to_int(data);
+ data += sizeof(uint16);
+
+ if (psk_len != data_length - DTLS_HS_LENGTH - DTLS_SKEXEC_ECDH_ANON_LENGTH - sizeof(uint16)) {
+ dtls_warn("the length of the server identity hint is worng\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_DECODE_ERROR);
+ }
+
+ if (psk_len > DTLS_PSK_MAX_CLIENT_IDENTITY_LEN) {
+ dtls_warn("please use a smaller server identity hint\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
+ }
+
+ // store the psk_identity_hint in config->keyx.psk for later use
+ config->keyx.psk.id_length = psk_len;
+ memcpy(config->keyx.psk.identity, data, psk_len);
+
+ data += psk_len;
+ data_length -= psk_len;
+
+ if (data_length < DTLS_HS_LENGTH + DTLS_SKEXEC_ECDH_ANON_LENGTH) {
+ dtls_alert("the packet length does not match the expected\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_DECODE_ERROR);
+ }
+
+ if (dtls_uint8_to_int(data) != TLS_EC_CURVE_TYPE_NAMED_CURVE) {
+ dtls_alert("Only named curves supported\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_HANDSHAKE_FAILURE);
+ }
+ data += sizeof(uint8);
+ data_length -= sizeof(uint8);
+
+ if (dtls_uint16_to_int(data) != TLS_EXT_ELLIPTIC_CURVES_SECP256R1) {
+ dtls_alert("secp256r1 supported\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_HANDSHAKE_FAILURE);
+ }
+ data += sizeof(uint16);
+ data_length -= sizeof(uint16);
+
+ if (dtls_uint8_to_int(data) != 1 + 2 * DTLS_EC_KEY_SIZE) {
+ dtls_alert("expected 65 bytes long public point\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_HANDSHAKE_FAILURE);
+ }
+ data += sizeof(uint8);
+ data_length -= sizeof(uint8);
+
+ if (dtls_uint8_to_int(data) != 4) {
+ dtls_alert("expected uncompressed public point\n");
+ return dtls_alert_fatal_create(DTLS_ALERT_DECODE_ERROR);
+ }
+ data += sizeof(uint8);
+ data_length -= sizeof(uint8);
+
+ memcpy(config->keyx.ecc.other_eph_pub_x, data, sizeof(config->keyx.ecc.other_eph_pub_x));
+ data += sizeof(config->keyx.ecc.other_eph_pub_x);
+ data_length -= sizeof(config->keyx.ecc.other_eph_pub_x);
+
+ memcpy(config->keyx.ecc.other_eph_pub_y, data, sizeof(config->keyx.ecc.other_eph_pub_y));
+ data += sizeof(config->keyx.ecc.other_eph_pub_y);
+ data_length -= sizeof(config->keyx.ecc.other_eph_pub_y);
+
+ return 0;
+}
+#endif /* defined(DTLS_PSK) && defined(DTLS_ECC) */
#ifdef DTLS_PSK
static int
if (security->cipher == TLS_NULL_WITH_NULL_NULL) {
/* no cipher suite selected */
return clen;
+ } else if (is_tls_ecdh_anon_with_aes_128_cbc_sha_256(security->cipher) ||
+ is_tls_ecdhe_psk_with_aes_128_cbc_sha_256(security->cipher)) {
+
+ unsigned char nonce[DTLS_CBC_IV_LENGTH];
+
+ if (clen < (DTLS_CBC_IV_LENGTH + DTLS_HMAC_DIGEST_SIZE)) /* need at least IV and MAC */
+ return -1;
+
+ memcpy(nonce, *cleartext , DTLS_CBC_IV_LENGTH);
+ clen -= DTLS_CBC_IV_LENGTH;
+ *cleartext += DTLS_CBC_IV_LENGTH ;
+
+ clen = dtls_decrypt(*cleartext, clen, *cleartext, nonce,
+ dtls_kb_remote_write_key(security, peer->role),
+ dtls_kb_key_size(security, peer->role),
+ NULL, 0,
+ security->cipher);
+
} else { /* TLS_PSK_WITH_AES_128_CCM_8 or TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8 */
/**
* length of additional_data for the AEAD cipher which consists of
memset(nonce, 0, DTLS_CCM_BLOCKSIZE);
memcpy(nonce, dtls_kb_remote_iv(security, peer->role),
- dtls_kb_iv_size(security, peer->role));
+ dtls_kb_iv_size(security, peer->role));
/* read epoch and seq_num from message */
memcpy(nonce + dtls_kb_iv_size(security, peer->role), *cleartext, 8);
dtls_kb_remote_write_key(security, peer->role),
dtls_kb_key_size(security, peer->role),
A_DATA, A_DATA_LEN,
- security->cipher);
- if (clen < 0)
- dtls_warn("decryption failed\n");
- else {
+ security->cipher);
+ }
+
+ if (clen < 0)
+ dtls_warn("decryption failed\n");
+ else {
#ifndef NDEBUG
- dtls_debug("decrypt_verify(): found %i bytes cleartext\n", clen);
+ dtls_debug("decrypt_verify(): found %i bytes cleartext\n", clen);
#endif
- dtls_security_params_free_other(peer);
- dtls_debug_dump("cleartext", *cleartext, clen);
- }
+ dtls_security_params_free_other(peer);
+ dtls_debug_dump("cleartext", *cleartext, clen);
}
+
return clen;
}
}
if (is_tls_ecdhe_ecdsa_with_aes_128_ccm_8(peer->handshake_params->cipher))
peer->state = DTLS_STATE_WAIT_SERVERCERTIFICATE; //ecdsa
- else if (is_tls_ecdh_anon_with_aes_128_cbc_sha(peer->handshake_params->cipher))
+ else if (is_tls_ecdh_anon_with_aes_128_cbc_sha_256(peer->handshake_params->cipher) ||
+ is_tls_ecdhe_psk_with_aes_128_cbc_sha_256(peer->handshake_params->cipher))
peer->state = DTLS_STATE_WAIT_SERVERKEYEXCHANGE; //ecdh
else
peer->state = DTLS_STATE_WAIT_SERVERHELLODONE; //psk
err = check_server_key_exchange_ecdsa(ctx, peer, data, data_length);
}
- if (is_tls_ecdh_anon_with_aes_128_cbc_sha(peer->handshake_params->cipher)) {
+ if (is_tls_ecdh_anon_with_aes_128_cbc_sha_256(peer->handshake_params->cipher)) {
if (state != DTLS_STATE_WAIT_SERVERKEYEXCHANGE) {
return dtls_alert_fatal_create(DTLS_ALERT_UNEXPECTED_MESSAGE);
}
err = check_server_key_exchange_ecdh(ctx, peer, data, data_length);
}
#endif /* DTLS_ECC */
+
+#if defined(DTLS_PSK) && defined(DTLS_ECC)
+ if (is_tls_ecdhe_psk_with_aes_128_cbc_sha_256(peer->handshake_params->cipher)) {
+ if (state != DTLS_STATE_WAIT_SERVERKEYEXCHANGE) {
+ return dtls_alert_fatal_create(DTLS_ALERT_UNEXPECTED_MESSAGE);
+ }
+ err = check_server_key_exchange_ecdhe_psk(ctx, peer, data, data_length);
+ }
+#endif defined(DTLS_PSK) && defined(DTLS_ECC)
+
#ifdef DTLS_PSK
if (is_tls_psk_with_aes_128_ccm_8(peer->handshake_params->cipher)) {
if (state != DTLS_STATE_WAIT_SERVERHELLODONE) {
projects / platform / upstream / iotivity.git / blobdiff