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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
#include "tls/s2n_alerts.h"
#include "tls/s2n_tls.h"
#define ERROR_ALERTS_COUNT (UINT16_MAX)
#define END_OF_DATA 0
#define MODE_COUNT 2
int s2n_test_ch_cb(struct s2n_connection *conn, void *context)
{
return S2N_FAILURE;
}
typedef enum {
S2N_TEST_DURING_HANDSHAKE,
S2N_TEST_AFTER_HANDSHAKE,
S2N_TEST_TYPE_COUNT
} s2n_test_type;
int main(int argc, char **argv)
{
BEGIN_TEST();
if (!s2n_is_tls13_fully_supported()) {
return 0;
}
uint8_t alert_header[] = {
/* type */
TLS_ALERT,
/* legacy_record_version */
0x03, 0x03,
/* length */
0x00, 0x02
};
uint8_t close_notify[] = { 1, S2N_TLS_ALERT_CLOSE_NOTIFY };
uint8_t data[] = "hello";
/**
*= https://tools.ietf.org/rfc/rfc8446#section-6
*= type=test
*# Unknown Alert types MUST be treated as error alerts.
*/
uint8_t test_alert_levels[] = { 0, 1, 2, 3, 10, UINT8_MAX };
/**
*= https://tools.ietf.org/rfc/rfc8446#section-6
*= type=test
*# All the alerts listed in Section 6.2 MUST be sent with
*# AlertLevel=fatal and MUST be treated as error alerts when received
*# regardless of the AlertLevel in the message.
*/
uint8_t error_alerts[ERROR_ALERTS_COUNT][2] = { 0 };
size_t error_alerts_count = 0;
for (size_t level_i = 0; level_i < s2n_array_len(test_alert_levels); level_i++) {
for (size_t alert_code = 0; alert_code <= UINT8_MAX; alert_code++) {
/* Skip closure alerts */
if (alert_code == S2N_TLS_ALERT_CLOSE_NOTIFY) {
continue;
}
if (alert_code == S2N_TLS_ALERT_USER_CANCELED) {
continue;
}
/* To speed up the test, let's exclude a chunk of the unassigned values. */
if (alert_code > 120 && alert_code < 250) {
continue;
}
EXPECT_TRUE(error_alerts_count < ERROR_ALERTS_COUNT);
error_alerts[error_alerts_count][0] = test_alert_levels[level_i];
error_alerts[error_alerts_count][1] = alert_code;
error_alerts_count++;
}
}
DEFER_CLEANUP(struct s2n_cert_chain_and_key *chain_and_key = NULL,
s2n_cert_chain_and_key_ptr_free);
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&chain_and_key,
S2N_DEFAULT_TEST_CERT_CHAIN, S2N_DEFAULT_TEST_PRIVATE_KEY));
DEFER_CLEANUP(struct s2n_cert_chain_and_key *ecdsa_chain_and_key = NULL,
s2n_cert_chain_and_key_ptr_free);
EXPECT_SUCCESS(s2n_test_cert_chain_and_key_new(&ecdsa_chain_and_key,
S2N_DEFAULT_ECDSA_TEST_CERT_CHAIN, S2N_DEFAULT_ECDSA_TEST_PRIVATE_KEY));
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(),
s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_config_set_unsafe_for_testing(config));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "default_tls13"));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(config, chain_and_key));
DEFER_CLEANUP(struct s2n_config *ecdsa_config = s2n_config_new(),
s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_config_set_unsafe_for_testing(ecdsa_config));
EXPECT_SUCCESS(s2n_config_add_cert_chain_and_key_to_store(ecdsa_config, ecdsa_chain_and_key));
/* Test: Receiving an error alert */
for (size_t i = 0; i < error_alerts_count; i++) {
for (s2n_test_type type = 0; type < S2N_TEST_TYPE_COUNT; type++) {
for (uint8_t mode = 0; mode < MODE_COUNT; mode++) {
DEFER_CLEANUP(struct s2n_connection *server = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(server, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(server, config));
DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(client, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(client, config));
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_io_stuffer_pair_init(&io_pair));
EXPECT_OK(s2n_connections_set_io_stuffer_pair(client, server, &io_pair));
if (type == S2N_TEST_DURING_HANDSHAKE) {
/* Partially perform handshake */
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server, client, SERVER_CERT));
} else {
/* Complete handshake */
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server, client));
}
EXPECT_EQUAL(server->actual_protocol_version, S2N_TLS13);
struct s2n_connection *receiver = server;
struct s2n_connection *sender = client;
if (mode == S2N_CLIENT) {
receiver = client;
sender = server;
}
/* Send alert */
struct s2n_blob alert = { 0 };
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
EXPECT_SUCCESS(s2n_blob_init(&alert, error_alerts[i], sizeof(error_alerts[0])));
EXPECT_OK(s2n_record_write(sender, TLS_ALERT, &alert));
EXPECT_SUCCESS(s2n_flush(sender, &blocked));
/**
*= https://tools.ietf.org/rfc/rfc8446#section-6
*= type=test
*# Upon receiving an error alert, the TLS implementation
*# SHOULD indicate an error to the application and MUST NOT allow any
*# further data to be sent or received on the connection.
*/
if (type == S2N_TEST_DURING_HANDSHAKE) {
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(receiver, &blocked), S2N_ERR_ALERT);
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(receiver, &blocked), S2N_ERR_CLOSED);
} else {
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(receiver, data, sizeof(data), &blocked), S2N_ERR_ALERT);
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(receiver, data, sizeof(data), &blocked), S2N_ERR_CLOSED);
EXPECT_FAILURE_WITH_ERRNO(s2n_send(receiver, data, sizeof(data), &blocked), S2N_ERR_CLOSED);
}
/**
*= https://tools.ietf.org/rfc/rfc8446#section-6.2
*= type=test
*# Upon transmission or
*# receipt of a fatal alert message, both parties MUST immediately close
*# the connection.
*/
EXPECT_TRUE(s2n_connection_check_io_status(receiver, S2N_IO_CLOSED));
/**
*= https://tools.ietf.org/rfc/rfc8446#section-6.2
*= type=test
*# The implementation SHOULD provide a way to facilitate logging the sending
*# and receiving of alerts.
*/
EXPECT_EQUAL(error_alerts[i][1], s2n_connection_get_alert(receiver));
}
}
};
/* Test: Sending an error alert */
{
/* Testing a variety of alerts is more difficult sending than receiving.
* We can't trigger every possible fatal error, so just choose some common ones.
*/
int test_errors[] = {
/* handshake errors without blinding */
S2N_ERR_CANCELLED,
S2N_ERR_CIPHER_NOT_SUPPORTED,
/* handshake errors with blinding */
S2N_ERR_PROTOCOL_DOWNGRADE_DETECTED,
S2N_ERR_CERT_UNTRUSTED,
/* application data error */
S2N_ERR_DECRYPT,
};
DEFER_CLEANUP(struct s2n_config *bad_cb_config = s2n_config_new(),
s2n_config_ptr_free);
EXPECT_SUCCESS(s2n_config_set_client_hello_cb(bad_cb_config, s2n_test_ch_cb, NULL));
DEFER_CLEANUP(struct s2n_config *untrusted_config = s2n_config_new(),
s2n_config_ptr_free);
for (size_t i = 0; i < s2n_array_len(test_errors); i++) {
DEFER_CLEANUP(struct s2n_connection *server = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(server, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(server, config));
DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(client, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(client, config));
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_io_stuffer_pair_init(&io_pair));
EXPECT_OK(s2n_connections_set_io_stuffer_pair(client, server, &io_pair));
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
uint8_t expected_alert = S2N_TLS_ALERT_CLOSE_NOTIFY;
struct s2n_connection *failed_conn = server;
struct s2n_connection *closed_conn = client;
switch (test_errors[i]) {
case S2N_ERR_CANCELLED:
/* Error triggered by callback failure during handshake */
EXPECT_SUCCESS(s2n_connection_set_config(server, bad_cb_config));
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate_test_server_and_client(server, client),
S2N_ERR_CANCELLED);
expected_alert = S2N_TLS_ALERT_HANDSHAKE_FAILURE;
break;
case S2N_ERR_CIPHER_NOT_SUPPORTED:
/* Error triggered if no valid cipher suites.
* Use a security policy that only supports RSA certs for the client,
* and only set an EC cert for the server.
*/
EXPECT_SUCCESS(s2n_connection_set_config(server, ecdsa_config));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(client, "20170210"));
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate_test_server_and_client(server, client),
S2N_ERR_CIPHER_NOT_SUPPORTED);
break;
case S2N_ERR_PROTOCOL_DOWNGRADE_DETECTED:
/* Remove TLS1.3 support before the ClientHello by setting
* a security policy that doesn't support TLS1.3, then add
* TLS1.3 support back after the ClientHello.
*/
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(client, "20170210"));
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(client, &blocked), S2N_ERR_IO_BLOCKED);
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(server, &blocked), S2N_ERR_IO_BLOCKED);
client->client_protocol_version = S2N_TLS13;
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate_test_server_and_client(server, client),
S2N_ERR_PROTOCOL_DOWNGRADE_DETECTED);
failed_conn = client;
closed_conn = server;
break;
case S2N_ERR_CERT_UNTRUSTED:
EXPECT_SUCCESS(s2n_connection_set_config(client, untrusted_config));
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate_test_server_and_client(server, client),
S2N_ERR_CERT_UNTRUSTED);
failed_conn = client;
closed_conn = server;
break;
case S2N_ERR_DECRYPT:
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server, client));
/* The server will expect the original sequence number,
* not our updated sequence number, so fail to decrypt.
*/
client->secure->client_sequence_number[0] = 0xFF;
EXPECT_EQUAL(s2n_send(client, data, sizeof(data), &blocked), sizeof(data));
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(server, data, sizeof(data), &blocked),
S2N_ERR_DECRYPT);
break;
default:
FAIL_MSG("Fatal error not implemented for test");
}
/* Remove any blinding so that we can immediately call shutdown */
failed_conn->delay = 0;
/* The alert will not be sent until we attempt to shutdown */
EXPECT_SUCCESS(s2n_shutdown_send(failed_conn, &blocked));
EXPECT_TRUE(failed_conn->alert_sent);
/**
*= https://tools.ietf.org/rfc/rfc8446#section-6.2
*= type=test
*# Upon transmission or
*# receipt of a fatal alert message, both parties MUST immediately close
*# the connection.
*/
EXPECT_TRUE(s2n_connection_check_io_status(failed_conn, S2N_IO_CLOSED));
/**
*= https://tools.ietf.org/rfc/rfc8446#section-6.2
*= type=test
*# Whenever an implementation encounters a fatal error condition, it
*# SHOULD send an appropriate fatal alert
*/
if (expected_alert == S2N_TLS_ALERT_CLOSE_NOTIFY) {
EXPECT_EQUAL(s2n_recv(closed_conn, data, sizeof(data), &blocked), END_OF_DATA);
EXPECT_EQUAL(blocked, S2N_NOT_BLOCKED);
} else {
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(closed_conn, data, sizeof(data), &blocked), S2N_ERR_ALERT);
}
EXPECT_EQUAL(expected_alert, s2n_connection_get_alert(closed_conn));
/**
*= https://tools.ietf.org/rfc/rfc8446#section-6.2
*= type=test
*# and MUST close the connection
*# without sending or receiving any additional data.
*/
EXPECT_FAILURE_WITH_ERRNO(s2n_send(failed_conn, data, sizeof(data), &blocked),
S2N_ERR_CLOSED);
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(failed_conn, data, sizeof(data), &blocked), S2N_ERR_CLOSED);
}
};
/* Test: Receiving a closure alert
*
*= https://tools.ietf.org/rfc/rfc8446#section-6.1
*= type=test
*# Either party MAY initiate a close of its write side of the connection
*# by sending a "close_notify" alert. Any data received after a closure
*# alert has been received MUST be ignored.
*/
for (s2n_test_type type = 0; type < S2N_TEST_TYPE_COUNT; type++) {
for (uint8_t mode = 0; mode < MODE_COUNT; mode++) {
DEFER_CLEANUP(struct s2n_connection *server = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(server, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(server, config));
DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(client, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(client, config));
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_io_stuffer_pair_init(&io_pair));
EXPECT_OK(s2n_connections_set_io_stuffer_pair(client, server, &io_pair));
if (type == S2N_TEST_DURING_HANDSHAKE) {
/* Partially perform handshake */
EXPECT_OK(s2n_negotiate_test_server_and_client_until_message(server, client, SERVER_CERT));
} else {
/* Complete handshake */
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server, client));
}
struct s2n_connection *receiver = server;
struct s2n_stuffer *input = &io_pair.server_in;
if (mode == S2N_CLIENT) {
receiver = client;
input = &io_pair.client_in;
}
/* Send close_notify */
EXPECT_SUCCESS(s2n_stuffer_write_bytes(input, alert_header, sizeof(alert_header)));
EXPECT_SUCCESS(s2n_stuffer_write_bytes(input, close_notify, sizeof(close_notify)));
/* Receive close_notify */
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
if (type == S2N_TEST_DURING_HANDSHAKE) {
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(receiver, &blocked), S2N_ERR_CLOSED);
} else {
EXPECT_EQUAL(s2n_recv(receiver, data, sizeof(data), &blocked), END_OF_DATA);
EXPECT_EQUAL(blocked, S2N_NOT_BLOCKED);
}
EXPECT_FALSE(s2n_connection_check_io_status(receiver, S2N_IO_READABLE));
/*
*= https://tools.ietf.org/rfc/rfc8446#section-6.1
*= type=test
*# Any data received after a closure alert has been received MUST be ignored.
*/
EXPECT_SUCCESS(s2n_stuffer_write_bytes(input, data, sizeof(data)));
if (type == S2N_TEST_DURING_HANDSHAKE) {
EXPECT_FAILURE_WITH_ERRNO(s2n_negotiate(receiver, &blocked), S2N_ERR_CLOSED);
} else {
EXPECT_EQUAL(s2n_recv(receiver, data, sizeof(data), &blocked), END_OF_DATA);
EXPECT_EQUAL(blocked, S2N_NOT_BLOCKED);
}
};
};
/* Test: Sending a closure alert
*
*= https://tools.ietf.org/rfc/rfc8446#section-6.1
*= type=test
*# Each party MUST send a "close_notify" alert before closing its write
*# side of the connection, unless it has already sent some error alert.
*# This does not have any effect on its read side of the connection.
*/
for (uint8_t mode = 0; mode < MODE_COUNT; mode++) {
DEFER_CLEANUP(struct s2n_connection *server = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(server, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(server, config));
DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(client, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(client, config));
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_io_stuffer_pair_init(&io_pair));
EXPECT_OK(s2n_connections_set_io_stuffer_pair(client, server, &io_pair));
/* Perform handshake */
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server, client));
EXPECT_EQUAL(server->actual_protocol_version, S2N_TLS13);
struct s2n_connection *sender = server;
struct s2n_connection *receiver = client;
if (mode == S2N_CLIENT) {
sender = client;
receiver = server;
}
/* Send close_notify */
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
EXPECT_SUCCESS(s2n_shutdown_send(sender, &blocked));
EXPECT_FALSE(s2n_connection_check_io_status(sender, S2N_IO_WRITABLE));
/* Receive close_notify
*
*= https://tools.ietf.org/rfc/rfc8446#section-6
*= type=test
*# The "close_notify" alert is used to indicate orderly closure of one
*# direction of the connection. Upon receiving such an alert, the TLS
*# implementation SHOULD indicate end-of-data to the application.
*/
EXPECT_EQUAL(s2n_recv(receiver, data, sizeof(data), &blocked), END_OF_DATA);
EXPECT_FALSE(s2n_connection_check_io_status(receiver, S2N_IO_READABLE));
EXPECT_EQUAL(blocked, S2N_NOT_BLOCKED);
/* Read side is NOT affected.
* The receiver of the close_notify can continue to send, and the sender
* should continue to read.
*/
EXPECT_EQUAL(s2n_send(receiver, data, sizeof(data), &blocked), sizeof(data));
EXPECT_EQUAL(blocked, S2N_NOT_BLOCKED);
EXPECT_EQUAL(s2n_recv(sender, data, sizeof(data), &blocked), sizeof(data));
EXPECT_EQUAL(blocked, S2N_NOT_BLOCKED);
/* Respond with close_notify */
EXPECT_SUCCESS(s2n_shutdown(receiver, &blocked));
EXPECT_SUCCESS(s2n_shutdown(sender, &blocked));
};
/* Test: Closure alerts in TLS1.2
*
*= https://tools.ietf.org/rfc/rfc8446#section-6.1
*= type=test
*# Note that this is a change from versions of TLS prior to TLS 1.3 in
*# which implementations were required to react to a "close_notify" by
*# discarding pending writes and sending an immediate "close_notify"
*# alert of their own.
*/
for (uint8_t mode = 0; mode < MODE_COUNT; mode++) {
DEFER_CLEANUP(struct s2n_connection *server = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(server, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(server, config));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(server, "default"));
DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(client, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(client, config));
EXPECT_SUCCESS(s2n_connection_set_cipher_preferences(client, "default"));
DEFER_CLEANUP(struct s2n_test_io_stuffer_pair io_pair = { 0 }, s2n_io_stuffer_pair_free);
EXPECT_OK(s2n_io_stuffer_pair_init(&io_pair));
EXPECT_OK(s2n_connections_set_io_stuffer_pair(client, server, &io_pair));
/* Perform handshake */
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server, client));
EXPECT_EQUAL(server->actual_protocol_version, S2N_TLS12);
struct s2n_connection *sender = server;
struct s2n_connection *receiver = client;
if (mode == S2N_CLIENT) {
sender = client;
receiver = server;
}
/* Send close_notify */
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
EXPECT_SUCCESS(s2n_shutdown_send(sender, &blocked));
EXPECT_TRUE(s2n_connection_check_io_status(sender, S2N_IO_CLOSED));
/* Receive close_notify */
EXPECT_EQUAL(s2n_recv(receiver, data, sizeof(data), &blocked), END_OF_DATA);
EXPECT_TRUE(s2n_connection_check_io_status(receiver, S2N_IO_CLOSED));
EXPECT_EQUAL(blocked, S2N_NOT_BLOCKED);
/* Read side is affected.
* The receiver should discard writes and just send a close_notify.
*/
EXPECT_FAILURE_WITH_ERRNO(s2n_send(receiver, data, sizeof(data), &blocked),
S2N_ERR_CLOSED);
/* Respond with close_notify */
EXPECT_SUCCESS(s2n_shutdown(receiver, &blocked));
EXPECT_SUCCESS(s2n_shutdown(sender, &blocked));
};
/* Test: End-of-Data
*
*= https://tools.ietf.org/rfc/rfc8446#6.1
*= type=test
*# If a transport-level close
*# is received prior to a "close_notify", the receiver cannot know that
*# all the data that was sent has been received.
*
*= https://tools.ietf.org/rfc/rfc8446#6.1
*= type=test
*# If the application protocol using TLS provides that any data may be
*# carried over the underlying transport after the TLS connection is
*# closed, the TLS implementation MUST receive a "close_notify" alert
*# before indicating end-of-data to the application layer.
*/
for (uint8_t mode = 0; mode < MODE_COUNT; mode++) {
/* Test: Without partial read */
{
DEFER_CLEANUP(struct s2n_connection *server = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(server, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(server, config));
DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(client, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(client, config));
DEFER_CLEANUP(struct s2n_test_io_pair io_pair = { 0 }, s2n_io_pair_close);
EXPECT_SUCCESS(s2n_io_pair_init_non_blocking(&io_pair));
EXPECT_SUCCESS(s2n_connections_set_io_pair(client, server, &io_pair));
/* Perform handshake */
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server, client));
/* Close one end of pipe */
EXPECT_SUCCESS(s2n_io_pair_close_one_end(&io_pair, mode));
struct s2n_connection *receiver = client;
if (mode == S2N_CLIENT) {
receiver = server;
}
/* Subsequent reads should NOT report END_OF_DATA, but instead an error */
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
for (size_t i = 0; i < 5; i++) {
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(receiver, data, sizeof(data), &blocked),
S2N_ERR_CLOSED);
EXPECT_FALSE(s2n_connection_check_io_status(receiver, S2N_IO_READABLE));
}
};
/* Test: With partial read */
{
/* In order to trigger a partial read, we need to encounter end-of-data
* when some data has already been successfully read. For that to be true,
* we need to read multiple records (one successfully, then end-of-data).
*/
struct s2n_config partial_write_config_copy = *config;
partial_write_config_copy.recv_multi_record = true;
DEFER_CLEANUP(struct s2n_connection *server = s2n_connection_new(S2N_SERVER),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(server, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(server, &partial_write_config_copy));
DEFER_CLEANUP(struct s2n_connection *client = s2n_connection_new(S2N_CLIENT),
s2n_connection_ptr_free);
EXPECT_SUCCESS(s2n_connection_set_blinding(client, S2N_SELF_SERVICE_BLINDING));
EXPECT_SUCCESS(s2n_connection_set_config(client, &partial_write_config_copy));
DEFER_CLEANUP(struct s2n_test_io_pair io_pair = { 0 }, s2n_io_pair_close);
EXPECT_SUCCESS(s2n_io_pair_init_non_blocking(&io_pair));
EXPECT_SUCCESS(s2n_connections_set_io_pair(client, server, &io_pair));
/* Perform handshake */
EXPECT_SUCCESS(s2n_negotiate_test_server_and_client(server, client));
struct s2n_connection *sender = server;
struct s2n_connection *receiver = client;
if (mode == S2N_CLIENT) {
sender = client;
receiver = server;
}
/* Send some data */
const uint8_t partial_write = sizeof(data) / 2;
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
EXPECT_EQUAL(s2n_send(sender, data, partial_write, &blocked), partial_write);
EXPECT_EQUAL(blocked, S2N_NOT_BLOCKED);
/* Close one end of pipe */
EXPECT_SUCCESS(s2n_io_pair_close_one_end(&io_pair, mode));
/* First read should report a partial read, but also close the connection */
EXPECT_EQUAL(s2n_recv(receiver, data, sizeof(data), &blocked), partial_write);
EXPECT_FALSE(s2n_connection_check_io_status(receiver, S2N_IO_READABLE));
/* Since we read at least one byte, the blocked status should be S2N_NOT_BLOCKED */
EXPECT_EQUAL(blocked, S2N_NOT_BLOCKED);
/* Subsequent reads should NOT report END_OF_DATA, but instead an error */
for (size_t i = 0; i < 5; i++) {
EXPECT_FAILURE_WITH_ERRNO(s2n_recv(receiver, data, sizeof(data), &blocked),
S2N_ERR_CLOSED);
}
};
};
END_TEST();
}
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