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openssl/test/ct_test.c
Rob Percival 876a1a83ad Tests should check validation status directly 
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
2016-06-20 11:54:56 +01:00

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/*
* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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"
#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 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;
int expected_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;
int setup_ok = 1;
CTLOG_STORE *ctlog_store;
memset(&fixture, 0, sizeof(fixture));
ctlog_store = CTLOG_STORE_new();
if (ctlog_store == NULL) {
setup_ok = 0;
fprintf(stderr, "Failed to create a new CT log store\n");
goto end;
}
if (CTLOG_STORE_load_default_file(ctlog_store) != 1) {
setup_ok = 0;
fprintf(stderr, "Failed to load CT log list\n");
goto end;
}
fixture.test_case_name = test_case_name;
fixture.ctlog_store = ctlog_store;
end:
if (!setup_ok) {
exit(EXIT_FAILURE);
}
return fixture;
}
static void tear_down(CT_TEST_FIXTURE fixture)
{
CTLOG_STORE_free(fixture.ctlog_store);
SCT_LIST_free(fixture.sct_list);
ERR_print_errors_fp(stderr);
}
static char *mk_file_path(const char *dir, const char *file)
{
char *full_file = NULL;
size_t full_file_l = 0;
const char *sep = "";
#ifndef OPENSSL_SYS_VMS
sep = "/";
#endif
full_file_l = strlen(dir) + strlen(sep) + strlen(file) + 1;
full_file = OPENSSL_zalloc(full_file_l);
if (full_file != NULL) {
OPENSSL_strlcpy(full_file, dir, full_file_l);
OPENSSL_strlcat(full_file, sep, full_file_l);
OPENSSL_strlcat(full_file, file, full_file_l);
}
return full_file;
}
static X509 *load_pem_cert(const char *dir, const char *file)
{
X509 *cert = NULL;
char *file_path = mk_file_path(dir, file);
if (file_path != NULL) {
BIO *cert_io = BIO_new_file(file_path, "r");
OPENSSL_free(file_path);
if (cert_io != NULL)
cert = PEM_read_bio_X509(cert_io, NULL, NULL, NULL);
BIO_free(cert_io);
}
return cert;
}
static int read_text_file(const char *dir, const char *file,
char *buffer, int buffer_length)
{
int result = -1;
char *file_path = mk_file_path(dir, file);
if (file_path != NULL) {
BIO *file_io = BIO_new_file(file_path, "r");
OPENSSL_free(file_path);
if (file_io != NULL) {
result = BIO_read(file_io, buffer, buffer_length);
BIO_free(file_io);
}
}
return result;
}
static int compare_sct_list_printout(STACK_OF(SCT) *sct,
const char *expected_output)
{
BIO *text_buffer = NULL;
char *actual_output = NULL;
int result = 1;
text_buffer = BIO_new(BIO_s_mem());
if (text_buffer == NULL) {
fprintf(stderr, "Unable to allocate buffer\n");
goto end;
}
SCT_LIST_print(sct, text_buffer, 0, "\n", NULL);
/* Append null terminator because we're about to use the buffer contents
* as a string. */
if (BIO_write(text_buffer, "\0", 1) != 1) {
fprintf(stderr, "Failed to append null terminator to SCT text\n");
goto end;
}
BIO_get_mem_data(text_buffer, &actual_output);
result = strcmp(actual_output, expected_output);
if (result != 0) {
fprintf(stderr,
"Expected SCT printout:\n%s\nActual SCT printout:\n%s\n",
expected_output, actual_output);
}
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 = 1;
text_buffer = BIO_new(BIO_s_mem());
if (text_buffer == NULL) {
fprintf(stderr, "Unable to allocate buffer\n");
goto end;
}
if (!X509V3_EXT_print(text_buffer, extension, X509V3_EXT_DEFAULT, 0)) {
fprintf(stderr, "Failed to print extension\n");
goto end;
}
/* Append null terminator because we're about to use the buffer contents
* as a string. */
if (BIO_write(text_buffer, "\0", 1) != 1) {
fprintf(stderr,
"Failed to append null terminator to extension text\n");
goto end;
}
BIO_get_mem_data(text_buffer, &actual_output);
result = strcmp(actual_output, expected_output);
if (result != 0) {
fprintf(stderr,
"Expected SCT printout:\n%s\nActual SCT printout:\n%s\n",
expected_output, actual_output);
}
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 (SCT_LIST_validate(scts, policy_ctx) < 0) {
fprintf(stderr, "Error verifying SCTs\n");
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;
default:
/* Ignore other validation statuses. */
break;
}
}
if (valid_sct_count != fixture.expected_sct_count) {
int unverified_sct_count = sk_SCT_num(scts) -
invalid_sct_count - valid_sct_count;
fprintf(stderr,
"%d SCTs failed verification\n"
"%d SCTs passed verification (%d expected)\n"
"%d SCTs were unverified\n",
invalid_sct_count,
valid_sct_count,
fixture.expected_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 (sct_text_len < 0) {
fprintf(stderr, "Test data file not found: %s\n",
fixture.sct_text_file);
goto end;
}
expected_sct_text[sct_text_len] = '\0';
}
CT_POLICY_EVAL_CTX_set0_log_store(ct_policy_ctx, fixture.ctlog_store);
if (fixture.certificate_file != NULL) {
int sct_extension_index;
X509_EXTENSION *sct_extension = NULL;
cert = load_pem_cert(fixture.certs_dir, fixture.certificate_file);
if (cert == NULL) {
fprintf(stderr, "Unable to load certificate: %s\n",
fixture.certificate_file);
goto end;
}
CT_POLICY_EVAL_CTX_set0_cert(ct_policy_ctx, cert);
if (fixture.issuer_file != NULL) {
issuer = load_pem_cert(fixture.certs_dir, fixture.issuer_file);
if (issuer == NULL) {
fprintf(stderr, "Unable to load issuer certificate: %s\n",
fixture.issuer_file);
goto end;
}
CT_POLICY_EVAL_CTX_set0_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 (sct_extension == NULL) {
fprintf(stderr, "SCT extension not found in: %s\n",
fixture.certificate_file);
goto end;
}
if (fixture.sct_text_file
&& compare_extension_printout(sct_extension,
expected_sct_text)) {
goto end;
}
if (fixture.test_validity) {
int i;
scts = X509V3_EXT_d2i(sct_extension);
for (i = 0; i < sk_SCT_num(scts); ++i) {
SCT *sct_i = sk_SCT_value(scts, i);
if (!SCT_set_source(sct_i, SCT_SOURCE_X509V3_EXTENSION)) {
fprintf(stderr,
"Error setting SCT source to X509v3 extension\n");
goto end;
}
}
if (!assert_validity(fixture, scts, ct_policy_ctx))
goto end;
}
} else if (sct_extension != NULL) {
fprintf(stderr,
"Expected no SCTs, but found SCT extension in: %s\n",
fixture.certificate_file);
goto end;
}
}
if (fixture.tls_sct_list != NULL) {
const unsigned char *p = fixture.tls_sct_list;
if (o2i_SCT_LIST(&scts, &p, fixture.tls_sct_list_len) == NULL) {
fprintf(stderr, "Failed to decode SCTs from TLS format\n");
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 (tls_sct_list_len != fixture.tls_sct_list_len ||
memcmp(fixture.tls_sct_list, tls_sct_list, tls_sct_list_len) != 0) {
fprintf(stderr,
"Failed to encode SCTs into TLS format correctly\n");
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()
{
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();
}
static int test_one_sct_in_certificate()
{
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();
}
static int test_multiple_scts_in_certificate()
{
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();
}
static int test_verify_one_sct()
{
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.test_validity = 1;
EXECUTE_CT_TEST();
}
static int test_verify_multiple_scts()
{
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.test_validity = 1;
EXECUTE_CT_TEST();
}
static int test_decode_tls_sct()
{
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();
}
static int test_encode_tls_sct()
{
const unsigned char 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";
const unsigned char signature[] = "\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();
STACK_OF(SCT) *sct_list = sk_SCT_new_null();
SCT *sct = SCT_new();
if (!SCT_set_version(sct, SCT_VERSION_V1)) {
fprintf(stderr, "Failed to set SCT version\n");
return 1;
}
if (!SCT_set1_log_id(sct, log_id, 32)) {
fprintf(stderr, "Failed to set SCT log ID\n");
return 1;
}
SCT_set_timestamp(sct, 1);
if (!SCT_set_signature_nid(sct, NID_ecdsa_with_SHA256)) {
fprintf(stderr, "Failed to set SCT signature NID\n");
return 1;
}
if (!SCT_set1_signature(sct, signature, 71)) {
fprintf(stderr, "Failed to set SCT signature\n");
return 1;
}
sk_SCT_push(sct_list, sct);
fixture.sct_list = sct_list;
fixture.sct_dir = ct_dir;
fixture.sct_text_file = "tls1.sct";
EXECUTE_CT_TEST();
}
int main(int argc, char *argv[])
{
int result = 0;
char *tmp_env = NULL;
tmp_env = getenv("OPENSSL_DEBUG_MEMORY");
if (tmp_env != NULL && strcmp(tmp_env, "on") == 0)
CRYPTO_set_mem_debug(1);
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
tmp_env = getenv("CT_DIR");
ct_dir = OPENSSL_strdup(tmp_env != NULL ? tmp_env : "ct");
tmp_env = getenv("CERTS_DIR");
certs_dir = OPENSSL_strdup(tmp_env != NULL ? tmp_env : "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_decode_tls_sct);
ADD_TEST(test_encode_tls_sct);
result = run_tests(argv[0]);
ERR_print_errors_fp(stderr);
OPENSSL_free(ct_dir);
OPENSSL_free(certs_dir);
#ifndef OPENSSL_NO_CRYPTO_MDEBUG
if (CRYPTO_mem_leaks_fp(stderr) <= 0)
result = 1;
#endif
return result;
}
#else /* OPENSSL_NO_CT */
int main(int argc, char* argv[])
{
return EXIT_SUCCESS;
}
#endif /* OPENSSL_NO_CT */
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