static int s2n_connection_wipe_keys(struct s2n_connection *conn)
{
/* Destroy any keys - we call destroy on the object as that is where
* keys are allocated. */
if (conn->secure.cipher_suite && conn->secure.cipher_suite->cipher->destroy_key) {
GUARD(conn->secure.cipher_suite->cipher->destroy_key(&conn->secure.client_key));
GUARD(conn->secure.cipher_suite->cipher->destroy_key(&conn->secure.server_key));
}
/* Free any server key received (we may not have completed a
* handshake, so this may not have been free'd yet) */
GUARD(s2n_rsa_public_key_free(&conn->secure.server_rsa_public_key));
GUARD(s2n_dh_params_free(&conn->secure.server_dh_params));
GUARD(s2n_ecc_params_free(&conn->secure.server_ecc_params));
return 0;
}
static int s2n_ecdhe_server_key_recv(struct s2n_connection *conn)
{
struct s2n_hash_state signature_hash;
struct s2n_stuffer *in = &conn->handshake.io;
struct s2n_blob ecdhparams;
struct s2n_blob signature;
uint16_t signature_length;
/* Read server ECDH params and calculate their hash */
GUARD(s2n_ecc_read_ecc_params(&conn->secure.server_ecc_params, in, &ecdhparams));
GUARD(s2n_hash_init(&signature_hash, conn->secure.signature_digest_alg));
if (conn->actual_protocol_version == S2N_TLS12) {
uint8_t hash_algorithm;
uint8_t signature_algorithm;
GUARD(s2n_stuffer_read_uint8(in, &hash_algorithm));
GUARD(s2n_stuffer_read_uint8(in, &signature_algorithm));
if (signature_algorithm != TLS_SIGNATURE_ALGORITHM_RSA) {
S2N_ERROR(S2N_ERR_BAD_MESSAGE);
}
switch(hash_algorithm) {
case TLS_HASH_ALGORITHM_MD5:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_MD5));
break;
case TLS_HASH_ALGORITHM_SHA1:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_SHA1));
break;
case TLS_HASH_ALGORITHM_SHA224:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_SHA224));
break;
case TLS_HASH_ALGORITHM_SHA256:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_SHA256));
break;
case TLS_HASH_ALGORITHM_SHA384:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_SHA384));
break;
case TLS_HASH_ALGORITHM_SHA512:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_SHA512));
break;
default:
S2N_ERROR(S2N_ERR_BAD_MESSAGE);
}
}
GUARD(s2n_hash_update(&signature_hash, conn->secure.client_random, S2N_TLS_RANDOM_DATA_LEN));
GUARD(s2n_hash_update(&signature_hash, conn->secure.server_random, S2N_TLS_RANDOM_DATA_LEN));
GUARD(s2n_hash_update(&signature_hash, ecdhparams.data, ecdhparams.size));
/* Verify the signature */
GUARD(s2n_stuffer_read_uint16(in, &signature_length));
signature.size = signature_length;
signature.data = s2n_stuffer_raw_read(in, signature.size);
notnull_check(signature.data);
gt_check(signature_length, 0);
if (s2n_rsa_verify(&conn->secure.server_rsa_public_key, &signature_hash, &signature) < 0) {
S2N_ERROR(S2N_ERR_BAD_MESSAGE);
}
/* We don't need the key any more, so free it */
GUARD(s2n_rsa_public_key_free(&conn->secure.server_rsa_public_key));
return 0;
}
static int s2n_dhe_server_key_recv(struct s2n_connection *conn)
{
struct s2n_hash_state signature_hash;
struct s2n_stuffer *in = &conn->handshake.io;
struct s2n_blob p, g, Ys, serverDHparams, signature;
uint16_t p_length;
uint16_t g_length;
uint16_t Ys_length;
uint16_t signature_length;
/* Keep a copy to the start of the whole structure for the signature check */
serverDHparams.data = s2n_stuffer_raw_read(in, 0);
notnull_check(serverDHparams.data);
/* Read each of the three elements in */
GUARD(s2n_stuffer_read_uint16(in, &p_length));
p.size = p_length;
p.data = s2n_stuffer_raw_read(in, p.size);
notnull_check(p.data);
GUARD(s2n_stuffer_read_uint16(in, &g_length));
g.size = g_length;
g.data = s2n_stuffer_raw_read(in, g.size);
notnull_check(g.data);
GUARD(s2n_stuffer_read_uint16(in, &Ys_length));
Ys.size = Ys_length;
Ys.data = s2n_stuffer_raw_read(in, Ys.size);
notnull_check(Ys.data);
/* Now we know the total size of the structure */
serverDHparams.size = 2 + p_length + 2 + g_length + 2 + Ys_length;
GUARD(s2n_hash_init(&signature_hash, conn->secure.signature_digest_alg));
if (conn->actual_protocol_version == S2N_TLS12) {
uint8_t hash_algorithm;
uint8_t signature_algorithm;
GUARD(s2n_stuffer_read_uint8(in, &hash_algorithm));
GUARD(s2n_stuffer_read_uint8(in, &signature_algorithm));
if (signature_algorithm != TLS_SIGNATURE_ALGORITHM_RSA) {
S2N_ERROR(S2N_ERR_BAD_MESSAGE);
}
switch(hash_algorithm) {
case TLS_HASH_ALGORITHM_MD5:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_MD5));
break;
case TLS_HASH_ALGORITHM_SHA1:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_SHA1));
break;
case TLS_HASH_ALGORITHM_SHA224:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_SHA224));
break;
case TLS_HASH_ALGORITHM_SHA256:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_SHA256));
break;
case TLS_HASH_ALGORITHM_SHA384:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_SHA384));
break;
case TLS_HASH_ALGORITHM_SHA512:
GUARD(s2n_hash_init(&signature_hash, S2N_HASH_SHA512));
break;
default:
S2N_ERROR(S2N_ERR_BAD_MESSAGE);
}
}
GUARD(s2n_hash_update(&signature_hash, conn->secure.client_random, S2N_TLS_RANDOM_DATA_LEN));
GUARD(s2n_hash_update(&signature_hash, conn->secure.server_random, S2N_TLS_RANDOM_DATA_LEN));
GUARD(s2n_hash_update(&signature_hash, serverDHparams.data, serverDHparams.size));
GUARD(s2n_stuffer_read_uint16(in, &signature_length));
signature.size = signature_length;
signature.data = s2n_stuffer_raw_read(in, signature.size);
notnull_check(signature.data);
gt_check(signature_length, 0);
if (s2n_rsa_verify(&conn->secure.server_rsa_public_key, &signature_hash, &signature) < 0) {
S2N_ERROR(S2N_ERR_BAD_MESSAGE);
}
/* We don't need the key any more, so free it */
GUARD(s2n_rsa_public_key_free(&conn->secure.server_rsa_public_key));
/* Copy the DH details */
GUARD(s2n_dh_p_g_Ys_to_dh_params(&conn->secure.server_dh_params, &p, &g, &Ys));
return 0;
}
int main(int argc, char **argv)
{
struct s2n_stuffer certificate_in, certificate_out;
struct s2n_stuffer dhparams_in, dhparams_out;
struct s2n_stuffer rsa_key_in, rsa_key_out;
struct s2n_blob b;
BEGIN_TEST();
EXPECT_SUCCESS(s2n_stuffer_alloc(&certificate_in, sizeof(certificate)));
EXPECT_SUCCESS(s2n_stuffer_alloc(&certificate_out, sizeof(certificate)));
EXPECT_SUCCESS(s2n_stuffer_alloc(&dhparams_in, sizeof(dhparams)));
EXPECT_SUCCESS(s2n_stuffer_alloc(&dhparams_out, sizeof(dhparams)));
EXPECT_SUCCESS(s2n_stuffer_alloc(&rsa_key_in, sizeof(private_key)));
EXPECT_SUCCESS(s2n_stuffer_alloc(&rsa_key_out, sizeof(private_key)));
b.data = certificate;
b.size = sizeof(certificate);
EXPECT_SUCCESS(s2n_stuffer_write(&certificate_in, &b));
b.data = private_key;
b.size = sizeof(private_key);
EXPECT_SUCCESS(s2n_stuffer_write(&rsa_key_in, &b));
b.data = dhparams;
b.size = sizeof(dhparams);
EXPECT_SUCCESS(s2n_stuffer_write(&dhparams_in, &b));
EXPECT_SUCCESS(s2n_stuffer_certificate_from_pem(&certificate_in, &certificate_out));
EXPECT_SUCCESS(s2n_stuffer_rsa_private_key_from_pem(&rsa_key_in, &rsa_key_out));
EXPECT_SUCCESS(s2n_stuffer_dhparams_from_pem(&dhparams_in, &dhparams_out));
struct s2n_rsa_private_key priv_key;
struct s2n_rsa_public_key pub_key;
b.size = s2n_stuffer_data_available(&certificate_out);
b.data = s2n_stuffer_raw_read(&certificate_out, b.size);
EXPECT_SUCCESS(s2n_asn1der_to_rsa_public_key(&pub_key, &b));
b.size = s2n_stuffer_data_available(&rsa_key_out);
b.data = s2n_stuffer_raw_read(&rsa_key_out, b.size);
EXPECT_SUCCESS(s2n_asn1der_to_rsa_private_key(&priv_key, &b));
EXPECT_SUCCESS(s2n_rsa_keys_match(&pub_key, &priv_key));
struct s2n_connection *conn;
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_SERVER));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key(conn->config, (char *)chain, (char *)private_key));
struct s2n_dh_params dh_params;
b.size = s2n_stuffer_data_available(&dhparams_out);
b.data = s2n_stuffer_raw_read(&dhparams_out, b.size);
EXPECT_SUCCESS(s2n_pkcs3_to_dh_params(&dh_params, &b));
EXPECT_SUCCESS(s2n_config_add_dhparams(conn->config, (char *)dhparams));
/* Try signing and verification with RSA */
uint8_t inputpad[] = "Hello world!";
struct s2n_blob signature;
struct s2n_hash_state tls10_one, tls10_two, tls12_one, tls12_two;
EXPECT_SUCCESS(s2n_hash_init(&tls10_one, S2N_HASH_MD5_SHA1));
EXPECT_SUCCESS(s2n_hash_init(&tls10_two, S2N_HASH_MD5_SHA1));
EXPECT_SUCCESS(s2n_hash_init(&tls12_one, S2N_HASH_SHA1));
EXPECT_SUCCESS(s2n_hash_init(&tls12_two, S2N_HASH_SHA1));
EXPECT_SUCCESS(s2n_alloc(&signature, s2n_rsa_public_encrypted_size(&pub_key)));
EXPECT_SUCCESS(s2n_hash_update(&tls10_one, inputpad, sizeof(inputpad)));
EXPECT_SUCCESS(s2n_hash_update(&tls10_two, inputpad, sizeof(inputpad)));
EXPECT_SUCCESS(s2n_rsa_sign(&priv_key, &tls10_one, &signature));
EXPECT_SUCCESS(s2n_rsa_verify(&pub_key, &tls10_two, &signature));
EXPECT_SUCCESS(s2n_hash_update(&tls12_one, inputpad, sizeof(inputpad)));
EXPECT_SUCCESS(s2n_hash_update(&tls12_two, inputpad, sizeof(inputpad)));
EXPECT_SUCCESS(s2n_rsa_sign(&priv_key, &tls12_one, &signature));
EXPECT_SUCCESS(s2n_rsa_verify(&pub_key, &tls12_two, &signature));
EXPECT_SUCCESS(s2n_dh_params_free(&dh_params));
EXPECT_SUCCESS(s2n_rsa_private_key_free(&priv_key));
EXPECT_SUCCESS(s2n_rsa_public_key_free(&pub_key));
EXPECT_SUCCESS(s2n_config_free_dhparams(conn->config));
EXPECT_SUCCESS(s2n_config_free_cert_chain_and_key(conn->config));
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(s2n_free(&signature));
EXPECT_SUCCESS(s2n_stuffer_free(&certificate_in));
EXPECT_SUCCESS(s2n_stuffer_free(&certificate_out));
EXPECT_SUCCESS(s2n_stuffer_free(&dhparams_in));
EXPECT_SUCCESS(s2n_stuffer_free(&dhparams_out));
EXPECT_SUCCESS(s2n_stuffer_free(&rsa_key_in));
EXPECT_SUCCESS(s2n_stuffer_free(&rsa_key_out));
END_TEST();
}
