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openssl/test/ct_test.c

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/*
* Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/ct.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "testutil.h"
#include <openssl/crypto.h>
#ifndef OPENSSL_NO_CT
/* Used when declaring buffers to read text files into */
# define CT_TEST_MAX_FILE_SIZE 8096
static char *certs_dir = NULL;
static char *ct_dir = NULL;
typedef struct ct_test_fixture {
const char *test_case_name;
/* The current time in milliseconds */
uint64_t epoch_time_in_ms;
/* The CT log store to use during tests */
CTLOG_STORE* ctlog_store;
/* Set the following to test handling of SCTs in X509 certificates */
const char *certs_dir;
char *certificate_file;
char *issuer_file;
/* Expected number of SCTs */
int expected_sct_count;
/* Expected number of valid SCTS */
int expected_valid_sct_count;
/* Set the following to test handling of SCTs in TLS format */
const unsigned char *tls_sct_list;
size_t tls_sct_list_len;
STACK_OF(SCT) *sct_list;
/*
* A file to load the expected SCT text from.
* This text will be compared to the actual text output during the test.
* A maximum of |CT_TEST_MAX_FILE_SIZE| bytes will be read of this file.
*/
const char *sct_dir;
const char *sct_text_file;
/* Whether to test the validity of the SCT(s) */
int test_validity;
} CT_TEST_FIXTURE;
static CT_TEST_FIXTURE *set_up(const char *const test_case_name)
{
CT_TEST_FIXTURE *fixture = NULL;
if (!TEST_ptr(fixture = OPENSSL_zalloc(sizeof(*fixture))))
goto end;
fixture->test_case_name = test_case_name;
fixture->epoch_time_in_ms = 1580335307000ULL; /* Wed 29 Jan 2020 10:01:47 PM UTC */
if (!TEST_ptr(fixture->ctlog_store = CTLOG_STORE_new())
|| !TEST_int_eq(
CTLOG_STORE_load_default_file(fixture->ctlog_store), 1))
goto end;
return fixture;
end:
if (fixture != NULL)
CTLOG_STORE_free(fixture->ctlog_store);
OPENSSL_free(fixture);
TEST_error("Failed to setup");
return NULL;
}
static void tear_down(CT_TEST_FIXTURE *fixture)
{
if (fixture != NULL) {
CTLOG_STORE_free(fixture->ctlog_store);
SCT_LIST_free(fixture->sct_list);
}
OPENSSL_free(fixture);
}
static X509 *load_pem_cert(const char *dir, const char *file)
{
X509 *cert = NULL;
char *file_path = test_mk_file_path(dir, file);
if (file_path != NULL) {
BIO *cert_io = BIO_new_file(file_path, "r");
if (cert_io != NULL)
cert = PEM_read_bio_X509(cert_io, NULL, NULL, NULL);
BIO_free(cert_io);
}
OPENSSL_free(file_path);
return cert;
}
static int read_text_file(const char *dir, const char *file,
char *buffer, int buffer_length)
{
int len = -1;
char *file_path = test_mk_file_path(dir, file);
if (file_path != NULL) {
BIO *file_io = BIO_new_file(file_path, "r");
if (file_io != NULL)
len = BIO_read(file_io, buffer, buffer_length);
BIO_free(file_io);
}
OPENSSL_free(file_path);
return len;
}
static int compare_sct_list_printout(STACK_OF(SCT) *sct,
const char *expected_output)
{
BIO *text_buffer = NULL;
char *actual_output = NULL;
int result = 0;
if (!TEST_ptr(text_buffer = BIO_new(BIO_s_mem())))
goto end;
SCT_LIST_print(sct, text_buffer, 0, "\n", NULL);
/* Append \0 because we're about to use the buffer contents as a string. */
if (!TEST_true(BIO_write(text_buffer, "\0", 1)))
goto end;
BIO_get_mem_data(text_buffer, &actual_output);
if (!TEST_str_eq(actual_output, expected_output))
goto end;
result = 1;
end:
BIO_free(text_buffer);
return result;
}
static int compare_extension_printout(X509_EXTENSION *extension,
const char *expected_output)
{
BIO *text_buffer = NULL;
char *actual_output = NULL;
int result = 0;
if (!TEST_ptr(text_buffer = BIO_new(BIO_s_mem()))
|| !TEST_true(X509V3_EXT_print(text_buffer, extension,
X509V3_EXT_DEFAULT, 0)))
goto end;
/* Append \n because it's easier to create files that end with one. */
if (!TEST_true(BIO_write(text_buffer, "\n", 1)))
goto end;
/* Append \0 because we're about to use the buffer contents as a string. */
if (!TEST_true(BIO_write(text_buffer, "\0", 1)))
goto end;
BIO_get_mem_data(text_buffer, &actual_output);
if (!TEST_str_eq(actual_output, expected_output))
goto end;
result = 1;
end:
BIO_free(text_buffer);
return result;
}
static int assert_validity(CT_TEST_FIXTURE *fixture, STACK_OF(SCT) *scts,
CT_POLICY_EVAL_CTX *policy_ctx)
{
int invalid_sct_count = 0;
int valid_sct_count = 0;
int i;
if (!TEST_int_ge(SCT_LIST_validate(scts, policy_ctx), 0))
return 0;
for (i = 0; i < sk_SCT_num(scts); ++i) {
SCT *sct_i = sk_SCT_value(scts, i);
switch (SCT_get_validation_status(sct_i)) {
case SCT_VALIDATION_STATUS_VALID:
++valid_sct_count;
break;
case SCT_VALIDATION_STATUS_INVALID:
++invalid_sct_count;
break;
case SCT_VALIDATION_STATUS_NOT_SET:
case SCT_VALIDATION_STATUS_UNKNOWN_LOG:
case SCT_VALIDATION_STATUS_UNVERIFIED:
case SCT_VALIDATION_STATUS_UNKNOWN_VERSION:
/* Ignore other validation statuses. */
break;
}
}
if (!TEST_int_eq(valid_sct_count, fixture->expected_valid_sct_count)) {
int unverified_sct_count = sk_SCT_num(scts) -
invalid_sct_count - valid_sct_count;
TEST_info("%d SCTs failed, %d SCTs unverified",
invalid_sct_count, unverified_sct_count);
return 0;
}
return 1;
}
static int execute_cert_test(CT_TEST_FIXTURE *fixture)
{
int success = 0;
X509 *cert = NULL, *issuer = NULL;
STACK_OF(SCT) *scts = NULL;
SCT *sct = NULL;
char expected_sct_text[CT_TEST_MAX_FILE_SIZE];
int sct_text_len = 0;
unsigned char *tls_sct_list = NULL;
size_t tls_sct_list_len = 0;
CT_POLICY_EVAL_CTX *ct_policy_ctx = CT_POLICY_EVAL_CTX_new();
if (fixture->sct_text_file != NULL) {
sct_text_len = read_text_file(fixture->sct_dir, fixture->sct_text_file,
expected_sct_text,
CT_TEST_MAX_FILE_SIZE - 1);
if (!TEST_int_ge(sct_text_len, 0))
goto end;
expected_sct_text[sct_text_len] = '\0';
}
CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE(
ct_policy_ctx, fixture->ctlog_store);
CT_POLICY_EVAL_CTX_set_time(ct_policy_ctx, fixture->epoch_time_in_ms);
if (fixture->certificate_file != NULL) {
int sct_extension_index;
int i;
X509_EXTENSION *sct_extension = NULL;
if (!TEST_ptr(cert = load_pem_cert(fixture->certs_dir,
fixture->certificate_file)))
goto end;
CT_POLICY_EVAL_CTX_set1_cert(ct_policy_ctx, cert);
if (fixture->issuer_file != NULL) {
if (!TEST_ptr(issuer = load_pem_cert(fixture->certs_dir,
fixture->issuer_file)))
goto end;
CT_POLICY_EVAL_CTX_set1_issuer(ct_policy_ctx, issuer);
}
sct_extension_index =
X509_get_ext_by_NID(cert, NID_ct_precert_scts, -1);
sct_extension = X509_get_ext(cert, sct_extension_index);
if (fixture->expected_sct_count > 0) {
if (!TEST_ptr(sct_extension))
goto end;
if (fixture->sct_text_file
&& !compare_extension_printout(sct_extension,
expected_sct_text))
goto end;
scts = X509V3_EXT_d2i(sct_extension);
for (i = 0; i < sk_SCT_num(scts); ++i) {
SCT *sct_i = sk_SCT_value(scts, i);
if (!TEST_int_eq(SCT_get_source(sct_i),
SCT_SOURCE_X509V3_EXTENSION)) {
goto end;
}
}
if (fixture->test_validity) {
if (!assert_validity(fixture, scts, ct_policy_ctx))
goto end;
}
} else if (!TEST_ptr_null(sct_extension)) {
goto end;
}
}
if (fixture->tls_sct_list != NULL) {
const unsigned char *p = fixture->tls_sct_list;
if (!TEST_ptr(o2i_SCT_LIST(&scts, &p, fixture->tls_sct_list_len)))
goto end;
if (fixture->test_validity && cert != NULL) {
if (!assert_validity(fixture, scts, ct_policy_ctx))
goto end;
}
if (fixture->sct_text_file
&& !compare_sct_list_printout(scts, expected_sct_text)) {
goto end;
}
tls_sct_list_len = i2o_SCT_LIST(scts, &tls_sct_list);
if (!TEST_mem_eq(fixture->tls_sct_list, fixture->tls_sct_list_len,
tls_sct_list, tls_sct_list_len))
goto end;
}
success = 1;
end:
X509_free(cert);
X509_free(issuer);
SCT_LIST_free(scts);
SCT_free(sct);
CT_POLICY_EVAL_CTX_free(ct_policy_ctx);
OPENSSL_free(tls_sct_list);
return success;
}
# define SETUP_CT_TEST_FIXTURE() SETUP_TEST_FIXTURE(CT_TEST_FIXTURE, set_up)
# define EXECUTE_CT_TEST() EXECUTE_TEST(execute_cert_test, tear_down)
static int test_no_scts_in_certificate(void)
{
SETUP_CT_TEST_FIXTURE();
fixture->certs_dir = certs_dir;
fixture->certificate_file = "leaf.pem";
fixture->issuer_file = "subinterCA.pem";
fixture->expected_sct_count = 0;
EXECUTE_CT_TEST();
return result;
}
static int test_one_sct_in_certificate(void)
{
SETUP_CT_TEST_FIXTURE();
fixture->certs_dir = certs_dir;
fixture->certificate_file = "embeddedSCTs1.pem";
fixture->issuer_file = "embeddedSCTs1_issuer.pem";
fixture->expected_sct_count = 1;
fixture->sct_dir = certs_dir;
fixture->sct_text_file = "embeddedSCTs1.sct";
EXECUTE_CT_TEST();
return result;
}
static int test_multiple_scts_in_certificate(void)
{
SETUP_CT_TEST_FIXTURE();
fixture->certs_dir = certs_dir;
fixture->certificate_file = "embeddedSCTs3.pem";
fixture->issuer_file = "embeddedSCTs3_issuer.pem";
fixture->expected_sct_count = 3;
fixture->sct_dir = certs_dir;
fixture->sct_text_file = "embeddedSCTs3.sct";
EXECUTE_CT_TEST();
return result;
}
static int test_verify_one_sct(void)
{
SETUP_CT_TEST_FIXTURE();
fixture->certs_dir = certs_dir;
fixture->certificate_file = "embeddedSCTs1.pem";
fixture->issuer_file = "embeddedSCTs1_issuer.pem";
fixture->expected_sct_count = fixture->expected_valid_sct_count = 1;
fixture->test_validity = 1;
EXECUTE_CT_TEST();
return result;
}
static int test_verify_multiple_scts(void)
{
SETUP_CT_TEST_FIXTURE();
fixture->certs_dir = certs_dir;
fixture->certificate_file = "embeddedSCTs3.pem";
fixture->issuer_file = "embeddedSCTs3_issuer.pem";
fixture->expected_sct_count = fixture->expected_valid_sct_count = 3;
fixture->test_validity = 1;
EXECUTE_CT_TEST();
return result;
}
static int test_verify_fails_for_future_sct(void)
{
SETUP_CT_TEST_FIXTURE();
fixture->epoch_time_in_ms = 1365094800000ULL; /* Apr 4 17:00:00 2013 GMT */
fixture->certs_dir = certs_dir;
fixture->certificate_file = "embeddedSCTs1.pem";
fixture->issuer_file = "embeddedSCTs1_issuer.pem";
fixture->expected_sct_count = 1;
fixture->expected_valid_sct_count = 0;
fixture->test_validity = 1;
EXECUTE_CT_TEST();
return result;
}
static int test_decode_tls_sct(void)
{
const unsigned char tls_sct_list[] = "\x00\x78" /* length of list */
"\x00\x76"
"\x00" /* version */
/* log ID */
"\xDF\x1C\x2E\xC1\x15\x00\x94\x52\x47\xA9\x61\x68\x32\x5D\xDC\x5C\x79"
"\x59\xE8\xF7\xC6\xD3\x88\xFC\x00\x2E\x0B\xBD\x3F\x74\xD7\x64"
"\x00\x00\x01\x3D\xDB\x27\xDF\x93" /* timestamp */
"\x00\x00" /* extensions length */
"" /* extensions */
"\x04\x03" /* hash and signature algorithms */
"\x00\x47" /* signature length */
/* signature */
"\x30\x45\x02\x20\x48\x2F\x67\x51\xAF\x35\xDB\xA6\x54\x36\xBE\x1F\xD6"
"\x64\x0F\x3D\xBF\x9A\x41\x42\x94\x95\x92\x45\x30\x28\x8F\xA3\xE5\xE2"
"\x3E\x06\x02\x21\x00\xE4\xED\xC0\xDB\x3A\xC5\x72\xB1\xE2\xF5\xE8\xAB"
"\x6A\x68\x06\x53\x98\x7D\xCF\x41\x02\x7D\xFE\xFF\xA1\x05\x51\x9D\x89"
"\xED\xBF\x08";
SETUP_CT_TEST_FIXTURE();
fixture->tls_sct_list = tls_sct_list;
fixture->tls_sct_list_len = 0x7a;
fixture->sct_dir = ct_dir;
fixture->sct_text_file = "tls1.sct";
EXECUTE_CT_TEST();
return result;
}
static int test_encode_tls_sct(void)
{
const char log_id[] = "3xwuwRUAlFJHqWFoMl3cXHlZ6PfG04j8AC4LvT9012Q=";
const uint64_t timestamp = 1;
const char extensions[] = "";
const char signature[] = "BAMARzBAMiBIL2dRrzXbplQ2vh/WZA89v5pBQpSVkkUwKI+j5"
"eI+BgIhAOTtwNs6xXKx4vXoq2poBlOYfc9BAn3+/6EFUZ2J7b8I";
SCT *sct = NULL;
SETUP_CT_TEST_FIXTURE();
fixture->sct_list = sk_SCT_new_null();
if (fixture->sct_list == NULL)
return 0;
if (!TEST_ptr(sct = SCT_new_from_base64(SCT_VERSION_V1, log_id,
CT_LOG_ENTRY_TYPE_X509, timestamp,
extensions, signature)))
return 0;
sk_SCT_push(fixture->sct_list, sct);
fixture->sct_dir = ct_dir;
fixture->sct_text_file = "tls1.sct";
EXECUTE_CT_TEST();
return result;
}
/*
* Tests that the CT_POLICY_EVAL_CTX default time is approximately now.
* Allow +-10 minutes, as it may compensate for clock skew.
*/
static int test_default_ct_policy_eval_ctx_time_is_now(void)
{
int success = 0;
CT_POLICY_EVAL_CTX *ct_policy_ctx = CT_POLICY_EVAL_CTX_new();
const time_t default_time =
(time_t)(CT_POLICY_EVAL_CTX_get_time(ct_policy_ctx) / 1000);
const time_t time_tolerance = 600; /* 10 minutes */
if (!TEST_time_t_le(abs((int)difftime(time(NULL), default_time)),
time_tolerance))
goto end;
success = 1;
end:
CT_POLICY_EVAL_CTX_free(ct_policy_ctx);
return success;
}
static int test_ctlog_from_base64(void)
{
CTLOG *ctlogp = NULL;
const char notb64[] = "\01\02\03\04";
const char pad[] = "====";
const char name[] = "name";
/* We expect these to both fail! */
if (!TEST_true(!CTLOG_new_from_base64(&ctlogp, notb64, name))
|| !TEST_true(!CTLOG_new_from_base64(&ctlogp, pad, name)))
return 0;
return 1;
}
#endif
int setup_tests(void)
{
#ifndef OPENSSL_NO_CT
if ((ct_dir = getenv("CT_DIR")) == NULL)
ct_dir = "ct";
if ((certs_dir = getenv("CERTS_DIR")) == NULL)
certs_dir = "certs";
ADD_TEST(test_no_scts_in_certificate);
ADD_TEST(test_one_sct_in_certificate);
ADD_TEST(test_multiple_scts_in_certificate);
ADD_TEST(test_verify_one_sct);
ADD_TEST(test_verify_multiple_scts);
ADD_TEST(test_verify_fails_for_future_sct);
ADD_TEST(test_decode_tls_sct);
ADD_TEST(test_encode_tls_sct);
ADD_TEST(test_default_ct_policy_eval_ctx_time_is_now);
ADD_TEST(test_ctlog_from_base64);
#else
printf("No CT support\n");
#endif
return 1;
}
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