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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 <openssl/pem.h>
#include <openssl/x509.h>
#include <stdio.h>
#include <string.h>
#include "api/s2n.h"
#include "crypto/s2n_openssl.h"
#include "crypto/s2n_openssl_x509.h"
#include "error/s2n_errno.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
#include "tls/s2n_signature_scheme.h"
#include "tls/s2n_tls.h"
#include "tls/s2n_tls13.h"
#include "tls/s2n_x509_validator.h"
#include "utils/s2n_safety.h"
/* forward declaration */
S2N_RESULT s2n_x509_validator_check_cert_preferences(struct s2n_connection *conn, X509 *cert);
DEFINE_POINTER_CLEANUP_FUNC(BIO *, BIO_free);
int main(int argc, char **argv)
{
BEGIN_TEST();
uint8_t cert_file[S2N_MAX_TEST_PEM_SIZE] = { 0 };
X509 *cert = NULL;
BIO *certBio = NULL;
size_t certLen = 0;
const struct s2n_signature_scheme *const test_sig_scheme_list[] = {
&s2n_ecdsa_sha256,
&s2n_rsa_pkcs1_sha1,
};
const struct s2n_signature_preferences test_certificate_signature_preferences = {
.count = s2n_array_len(test_sig_scheme_list),
.signature_schemes = test_sig_scheme_list,
};
const struct s2n_security_policy test_sp = {
.minimum_protocol_version = S2N_TLS12,
.certificate_signature_preferences = &test_certificate_signature_preferences,
};
/* s2n_x509_validator_check_cert_preferences */
{
/* Connection using a security policy with no certificate_signature_preferences allows SHA-1 signatures in certificates */
{
struct s2n_connection *conn;
struct s2n_config *config = s2n_config_new();
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
/* 20140601 is a security policy with no certificate_signature_preferences list */
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "20140601"));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
EXPECT_SUCCESS(s2n_read_test_pem(S2N_RSA_2048_PKCS1_CERT_CHAIN, (char *) cert_file, S2N_MAX_TEST_PEM_SIZE));
certLen = strlen((const char *) cert_file);
/* Read the test certificates into an Openssl X509 struct */
EXPECT_NOT_NULL(certBio = BIO_new(BIO_s_mem()));
EXPECT_TRUE(BIO_write(certBio, cert_file, certLen) > 0);
EXPECT_NOT_NULL(cert = PEM_read_bio_X509(certBio, NULL, NULL, NULL));
EXPECT_OK(s2n_x509_validator_check_cert_preferences(conn, cert));
EXPECT_SUCCESS(s2n_config_free(config));
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(BIO_free(certBio));
X509_free(cert);
};
/* Connection using the default_tls13 security policy does not validate SHA-1 signatures in certificates */
{
struct s2n_connection *conn;
struct s2n_config *config = s2n_config_new();
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "default_tls13"));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
EXPECT_SUCCESS(s2n_read_test_pem(S2N_RSA_2048_PKCS1_CERT_CHAIN, (char *) cert_file, S2N_MAX_TEST_PEM_SIZE));
certLen = strlen((const char *) cert_file);
/* Read the test certificates into an Openssl X509 struct */
EXPECT_NOT_NULL(certBio = BIO_new(BIO_s_mem()));
EXPECT_TRUE(BIO_write(certBio, cert_file, certLen) > 0);
EXPECT_NOT_NULL(cert = PEM_read_bio_X509(certBio, NULL, NULL, NULL));
EXPECT_ERROR_WITH_ERRNO(s2n_x509_validator_check_cert_preferences(conn, cert),
S2N_ERR_CERT_UNTRUSTED);
EXPECT_SUCCESS(s2n_config_free(config));
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(BIO_free(certBio));
X509_free(cert);
};
/* Connection using the default_tls13 security policy ignores a SHA-1 signature on a root certificate */
{
struct s2n_connection *conn;
struct s2n_config *config = s2n_config_new();
EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
EXPECT_SUCCESS(s2n_config_set_cipher_preferences(config, "default_tls13"));
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
EXPECT_SUCCESS(s2n_read_test_pem(S2N_SHA1_ROOT_SIGNATURE_CA_CERT, (char *) cert_file, S2N_MAX_TEST_PEM_SIZE));
certLen = strlen((const char *) cert_file);
/* Read the test certificates into an Openssl X509 struct */
EXPECT_NOT_NULL(certBio = BIO_new(BIO_s_mem()));
EXPECT_TRUE(BIO_write(certBio, cert_file, certLen) > 0);
EXPECT_NOT_NULL(cert = PEM_read_bio_X509(certBio, NULL, NULL, NULL));
EXPECT_OK(s2n_x509_validator_check_cert_preferences(conn, cert));
EXPECT_SUCCESS(s2n_config_free(config));
EXPECT_SUCCESS(s2n_connection_free(conn));
EXPECT_SUCCESS(BIO_free(certBio));
X509_free(cert);
};
/* Certificate signature algorithm is in the test certificate signature preferences list but signature is SHA-1
* and TLS 1.3 has been negotiated.
*/
{
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
config->security_policy = &test_sp;
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_NOT_NULL(conn);
conn->actual_protocol_version = S2N_TLS13;
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
uint32_t cert_len = 0;
EXPECT_SUCCESS(s2n_read_test_pem_and_len(S2N_RSA_2048_PKCS1_CERT_CHAIN, cert_file,
&cert_len, S2N_MAX_TEST_PEM_SIZE));
/* Read the test certificates into an Openssl X509 struct */
DEFER_CLEANUP(BIO *cert_bio = BIO_new(BIO_s_mem()), BIO_free_pointer);
EXPECT_NOT_NULL(cert_bio);
EXPECT_TRUE(BIO_write(cert_bio, cert_file, cert_len) > 0);
DEFER_CLEANUP(X509 *test_cert = PEM_read_bio_X509(cert_bio, NULL, NULL, NULL), X509_free_pointer);
EXPECT_NOT_NULL(test_cert);
EXPECT_ERROR_WITH_ERRNO(s2n_x509_validator_check_cert_preferences(conn, test_cert), S2N_ERR_CERT_UNTRUSTED);
};
/* Certificate signature algorithm is in the test certificate signature preferences list and signature is SHA-1
* and TLS 1.2 has been negotiated.
*/
{
DEFER_CLEANUP(struct s2n_config *config = s2n_config_new(), s2n_config_ptr_free);
EXPECT_NOT_NULL(config);
config->security_policy = &test_sp;
DEFER_CLEANUP(struct s2n_connection *conn = s2n_connection_new(S2N_CLIENT), s2n_connection_ptr_free);
EXPECT_NOT_NULL(conn);
conn->actual_protocol_version = S2N_TLS12;
EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
uint32_t cert_len = 0;
EXPECT_SUCCESS(s2n_read_test_pem_and_len(S2N_RSA_2048_PKCS1_CERT_CHAIN, cert_file,
&cert_len, S2N_MAX_TEST_PEM_SIZE));
/* Read the test certificates into an Openssl X509 struct */
DEFER_CLEANUP(BIO *cert_bio = BIO_new(BIO_s_mem()), BIO_free_pointer);
EXPECT_NOT_NULL(cert_bio);
EXPECT_TRUE(BIO_write(cert_bio, cert_file, cert_len) > 0);
DEFER_CLEANUP(X509 *test_cert = PEM_read_bio_X509(cert_bio, NULL, NULL, NULL), X509_free_pointer);
EXPECT_NOT_NULL(test_cert);
EXPECT_OK(s2n_x509_validator_check_cert_preferences(conn, test_cert));
};
};
END_TEST();
return S2N_SUCCESS;
}
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