tls_openssl.c

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	}
	ERR_clear_error();
	free(passwd);
	SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
	
	if (!SSL_check_private_key(conn->ssl)) {
		wpa_printf(MSG_INFO, "SSL: Private key failed "
			   "verification: %s",
			   ERR_error_string(ERR_get_error(), NULL));
		return -1;
	}

	return 0;
}


int tls_global_private_key(void *_ssl_ctx, const char *private_key,
			   const char *private_key_passwd)
{
	SSL_CTX *ssl_ctx = _ssl_ctx;
	char *passwd;

	if (private_key == NULL)
		return 0;

	if (private_key_passwd) {
		passwd = strdup(private_key_passwd);
		if (passwd == NULL)
			return -1;
	} else
		passwd = NULL;

	SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
	SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
	if (SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
					SSL_FILETYPE_ASN1) != 1 &&
	    SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
					SSL_FILETYPE_PEM) != 1 &&
	    tls_read_pkcs12(ssl_ctx, NULL, private_key, passwd)) {
		wpa_printf(MSG_INFO, "SSL: Failed to load private key: %s",
			   ERR_error_string(ERR_get_error(), NULL));
		free(passwd);
		ERR_clear_error();
		return -1;
	}
	free(passwd);
	ERR_clear_error();
	SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
	
	if (!SSL_CTX_check_private_key(ssl_ctx)) {
		wpa_printf(MSG_INFO, "SSL: Private key failed "
			   "verification: %s",
			   ERR_error_string(ERR_get_error(), NULL));
		return -1;
	}

	return 0;
}


int tls_connection_dh(void *ssl_ctx, struct tls_connection *conn,
		      const char *dh_file)
{
#ifdef OPENSSL_NO_DH
	if (dh_file == NULL)
		return 0;
	wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
		   "dh_file specified");
	return -1;
#else /* OPENSSL_NO_DH */
	DH *dh;
	BIO *bio;

	if (dh_file == NULL)
		return 0;
	if (conn == NULL)
		return -1;

	bio = BIO_new_file(dh_file, "r");
	if (bio == NULL) {
		wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
			   dh_file, ERR_error_string(ERR_get_error(), NULL));
		return -1;
	}
	dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
	BIO_free(bio);
#ifndef OPENSSL_NO_DSA
	while (dh == NULL) {
		DSA *dsa;
		wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
			   " trying to parse as DSA params", dh_file,
			   ERR_error_string(ERR_get_error(), NULL));
		bio = BIO_new_file(dh_file, "r");
		if (bio == NULL)
			break;
		dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
		BIO_free(bio);
		if (!dsa) {
			wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
				   "'%s': %s", dh_file,
				   ERR_error_string(ERR_get_error(), NULL));
			break;
		}

		wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
		dh = DSA_dup_DH(dsa);
		DSA_free(dsa);
		if (dh == NULL) {
			wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
				   "params into DH params");
			break;
		}
		break;
	}
#endif /* !OPENSSL_NO_DSA */
	if (dh == NULL) {
		wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
			   "'%s'", dh_file);
		return -1;
	}

	if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
		wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
			   "%s", dh_file,
			   ERR_error_string(ERR_get_error(), NULL));
		DH_free(dh);
		return -1;
	}
	DH_free(dh);
	return 0;
#endif /* OPENSSL_NO_DH */
}


int tls_connection_get_keys(void *ssl_ctx, struct tls_connection *conn,
			    struct tls_keys *keys)
{
	SSL *ssl;

	if (conn == NULL || keys == NULL)
		return -1;
	ssl = conn->ssl;
	if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL)
		return -1;

	keys->master_key = ssl->session->master_key;
	keys->master_key_len = ssl->session->master_key_length;
	keys->client_random = ssl->s3->client_random;
	keys->client_random_len = SSL3_RANDOM_SIZE;
	keys->server_random = ssl->s3->server_random;
	keys->server_random_len = SSL3_RANDOM_SIZE;

	return 0;
}


u8 * tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
			      const u8 *in_data, size_t in_len,
			      size_t *out_len)
{
	int res;
	u8 *out_data;

	if (in_data &&
	    BIO_write(conn->ssl_in, in_data, in_len) < 0) {
		wpa_printf(MSG_INFO, "TLS: Handshake failed - BIO_write: %s",
			   ERR_error_string(ERR_get_error(), NULL));
		return NULL;
	}

	res = SSL_connect(conn->ssl);
	if (res != 1) {
		int err = SSL_get_error(conn->ssl, res);
		if (err == SSL_ERROR_WANT_READ)
			wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
				   "more data");
		else if (err == SSL_ERROR_WANT_WRITE)
			wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
				   "write");
		else {
			wpa_printf(MSG_INFO, "SSL: SSL_connect: %s",
				   ERR_error_string(ERR_get_error(), NULL));
			conn->failed++;
		}
	}

	res = BIO_ctrl_pending(conn->ssl_out);
	wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
	out_data = malloc(res == 0 ? 1 : res);
	if (out_data == NULL) {
		wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
			   "handshake output (%d bytes)", res);
		BIO_reset(conn->ssl_out);
		*out_len = 0;
		return NULL;
	}
	res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
	if (res < 0) {
		wpa_printf(MSG_INFO, "TLS: Handshake failed - BIO_read: %s",
			   ERR_error_string(ERR_get_error(), NULL));
		BIO_reset(conn->ssl_out);
		*out_len = 0;
		return NULL;
	}
	*out_len = res;
	return out_data;
}


u8 * tls_connection_server_handshake(void *ssl_ctx,
				     struct tls_connection *conn,
				     const u8 *in_data, size_t in_len,
				     size_t *out_len)
{
	int res;
	u8 *out_data;
	char buf[10];

	if (in_data &&
	    BIO_write(conn->ssl_in, in_data, in_len) < 0) {
		wpa_printf(MSG_INFO, "TLS: Handshake failed - BIO_write: %s",
			   ERR_error_string(ERR_get_error(), NULL));
		return NULL;
	}

	res = SSL_read(conn->ssl, buf, sizeof(buf));
	if (res >= 0) {
		wpa_printf(MSG_DEBUG, "SSL: Unexpected data from SSL_read "
			   "(res=%d)", res);
	}

	res = BIO_ctrl_pending(conn->ssl_out);
	wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
	out_data = malloc(res == 0 ? 1 : res);
	if (out_data == NULL) {
		wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
			   "handshake output (%d bytes)", res);
		BIO_reset(conn->ssl_out);
		*out_len = 0;
		return NULL;
	}
	res = res == 0 ? 0 : BIO_read(conn->ssl_out, out_data, res);
	if (res < 0) {
		wpa_printf(MSG_INFO, "TLS: Handshake failed - BIO_read: %s",
			   ERR_error_string(ERR_get_error(), NULL));
		BIO_reset(conn->ssl_out);
		*out_len = 0;
		return NULL;
	}
	*out_len = res;
	return out_data;
}


int tls_connection_encrypt(void *ssl_ctx, struct tls_connection *conn,
			   u8 *in_data, size_t in_len,
			   u8 *out_data, size_t out_len)
{
	int res;

	if (conn == NULL)
		return -1;

	BIO_reset(conn->ssl_in);
	BIO_reset(conn->ssl_out);
	res = SSL_write(conn->ssl, in_data, in_len);
	if (res < 0) {
		wpa_printf(MSG_INFO, "TLS: Encryption failed - SSL_write: %s",
			   ERR_error_string(ERR_get_error(), NULL));
		return res;
	}

	res = BIO_read(conn->ssl_out, out_data, out_len);
	if (res < 0) {
		wpa_printf(MSG_INFO, "TLS: Encryption failed - BIO_read: %s",
			   ERR_error_string(ERR_get_error(), NULL));
		return res;
	}

	return res;
}


int tls_connection_decrypt(void *ssl_ctx, struct tls_connection *conn,
			   u8 *in_data, size_t in_len,
			   u8 *out_data, size_t out_len)
{
	int res;

	res = BIO_write(conn->ssl_in, in_data, in_len);
	if (res < 0) {
		wpa_printf(MSG_INFO, "TLS: Decryption failed - BIO_write: %s",
			   ERR_error_string(ERR_get_error(), NULL));
		return res;
	}
	BIO_reset(conn->ssl_out);

	res = SSL_read(conn->ssl, out_data, out_len);
	if (res < 0) {
		wpa_printf(MSG_INFO, "TLS: Decryption failed - SSL_read: %s",
			   ERR_error_string(ERR_get_error(), NULL));
		return res;
	}

	return res;
}


int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
{
	return conn ? conn->ssl->hit : 0;
}


int tls_connection_set_master_key(void *ssl_ctx, struct tls_connection *conn,
				  const u8 *key, size_t key_len)
{
	SSL *ssl;

	if (conn == NULL || key == NULL || key_len > SSL_MAX_MASTER_KEY_LENGTH)
		return -1;
	ssl = conn->ssl;
	if (ssl == NULL || ssl->session == NULL)
		return -1;

	memcpy(ssl->session->master_key, key, key_len);
	ssl->session->master_key_length = key_len;

	return 0;
}


int tls_connection_set_anon_dh(void *ssl_ctx, struct tls_connection *conn)
{
	if (conn == NULL || conn->ssl == NULL)
		return -1;

	if (SSL_set_cipher_list(conn->ssl, "ADH-AES128-SHA") != 1) {
		wpa_printf(MSG_INFO, "TLS: Anon DH configuration failed - %s",
			   ERR_error_string(ERR_get_error(), NULL));
		return -1;
	}

	return 0;
}


int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
		   char *buf, size_t buflen)
{
	const char *name;
	if (conn == NULL || conn->ssl == NULL)
		return -1;

	name = SSL_get_cipher(conn->ssl);
	if (name == NULL)
		return -1;

	snprintf(buf, buflen, "%s", name);
	return 0;
}


int tls_connection_enable_workaround(void *ssl_ctx,
				     struct tls_connection *conn)
{
	SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);

	return 0;
}


#ifdef EAP_FAST
/* ClientHello TLS extensions require a patch to openssl, so this function is
 * commented out unless explicitly needed for EAP-FAST in order to be able to
 * build this file with unmodified openssl. */
int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
				    int ext_type, const u8 *data,
				    size_t data_len)
{
	struct tls_ext_hdr {
		u16 extensions_len;
		u16 extension_type;
		u16 extension_len;
	} *hdr;

	if (conn == NULL || conn->ssl == NULL)
		return -1;
	OPENSSL_free(conn->ssl->hello_extension);
	if (data == NULL) {
		conn->ssl->hello_extension = NULL;
		conn->ssl->hello_extension_len = 0;
		return 0;
	}
	if (data_len == 0) {
		conn->ssl->hello_extension = OPENSSL_malloc(1);
		conn->ssl->hello_extension_len = 0;
		return 0;
	}
	conn->ssl->hello_extension = OPENSSL_malloc(sizeof(*hdr) + data_len);
	if (conn->ssl->hello_extension == NULL)
		return -1;

	hdr = (struct tls_ext_hdr *) conn->ssl->hello_extension;
	hdr->extensions_len = host_to_be16(sizeof(*hdr) - 2 + data_len);
	hdr->extension_type = host_to_be16(ext_type);
	hdr->extension_len = host_to_be16(data_len);
	memcpy(hdr + 1, data, data_len);
	conn->ssl->hello_extension_len = sizeof(*hdr) + data_len;

	return 0;
}
#endif /* EAP_FAST */


int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
{
	if (conn == NULL)
		return -1;
	return conn->failed;
}


int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
{
	if (conn == NULL)
		return -1;
	return conn->read_alerts;
}


int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
{
	if (conn == NULL)
		return -1;
	return conn->write_alerts;
}