test/ct_test.c

   1 /*
   2  * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <ctype.h>
  11 #include <math.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15
  16 #include <openssl/ct.h>
  17 #include <openssl/err.h>
  18 #include <openssl/pem.h>
  19 #include <openssl/x509.h>
  20 #include <openssl/x509v3.h>
  21 #include "testutil.h"
  22 #include <openssl/crypto.h>
  23
  24 #ifndef OPENSSL_NO_CT
  25 /* Used when declaring buffers to read text files into */
  26 # define CT_TEST_MAX_FILE_SIZE 8096
  27
  28 static char *certs_dir = NULL;
  29 static char *ct_dir = NULL;
  30
  31 typedef struct ct_test_fixture {
  32     const char *test_case_name;
  33     /* The current time in milliseconds */
  34     uint64_t epoch_time_in_ms;
  35     /* The CT log store to use during tests */
  36     CTLOG_STORE* ctlog_store;
  37     /* Set the following to test handling of SCTs in X509 certificates */
  38     const char *certs_dir;
  39     char *certificate_file;
  40     char *issuer_file;
  41     /* Expected number of SCTs */
  42     int expected_sct_count;
  43     /* Expected number of valid SCTS */
  44     int expected_valid_sct_count;
  45     /* Set the following to test handling of SCTs in TLS format */
  46     const unsigned char *tls_sct_list;
  47     size_t tls_sct_list_len;
  48     STACK_OF(SCT) *sct_list;
  49     /*
  50      * A file to load the expected SCT text from.
  51      * This text will be compared to the actual text output during the test.
  52      * A maximum of |CT_TEST_MAX_FILE_SIZE| bytes will be read of this file.
  53      */
  54     const char *sct_dir;
  55     const char *sct_text_file;
  56     /* Whether to test the validity of the SCT(s) */
  57     int test_validity;
  58 } CT_TEST_FIXTURE;
  59
  60 static CT_TEST_FIXTURE *set_up(const char *const test_case_name)
  61 {
  62     CT_TEST_FIXTURE *fixture = NULL;
  63
  64     if (!TEST_ptr(fixture = OPENSSL_zalloc(sizeof(*fixture))))
  65         goto end;
  66     fixture->test_case_name = test_case_name;
  67     fixture->epoch_time_in_ms = 1473269626000; /* Sep 7 17:33:46 2016 GMT */
  68     if (!TEST_ptr(fixture->ctlog_store = CTLOG_STORE_new())
  69             || !TEST_int_eq(
  70                     CTLOG_STORE_load_default_file(fixture->ctlog_store), 1))
  71         goto end;
  72     return fixture;
  73
  74 end:
  75     if (fixture != NULL)
  76         CTLOG_STORE_free(fixture->ctlog_store);
  77     OPENSSL_free(fixture);
  78     TEST_error("Failed to setup");
  79     return NULL;
  80 }
  81
  82 static void tear_down(CT_TEST_FIXTURE *fixture)
  83 {
  84     if (fixture != NULL) {
  85         CTLOG_STORE_free(fixture->ctlog_store);
  86         SCT_LIST_free(fixture->sct_list);
  87     }
  88     OPENSSL_free(fixture);
  89 }
  90
  91 static char *mk_file_path(const char *dir, const char *file)
  92 {
  93 # ifndef OPENSSL_SYS_VMS
  94     const char *sep = "/";
  95 # else
  96     const char *sep = "";
  97 # endif
  98     size_t len = strlen(dir) + strlen(sep) + strlen(file) + 1;
  99     char *full_file = OPENSSL_zalloc(len);
 100
 101     if (full_file != NULL) {
 102         OPENSSL_strlcpy(full_file, dir, len);
 103         OPENSSL_strlcat(full_file, sep, len);
 104         OPENSSL_strlcat(full_file, file, len);
 105     }
 106
 107     return full_file;
 108 }
 109
 110 static X509 *load_pem_cert(const char *dir, const char *file)
 111 {
 112     X509 *cert = NULL;
 113     char *file_path = mk_file_path(dir, file);
 114
 115     if (file_path != NULL) {
 116         BIO *cert_io = BIO_new_file(file_path, "r");
 117
 118         if (cert_io != NULL)
 119             cert = PEM_read_bio_X509(cert_io, NULL, NULL, NULL);
 120         BIO_free(cert_io);
 121     }
 122
 123     OPENSSL_free(file_path);
 124     return cert;
 125 }
 126
 127 static int read_text_file(const char *dir, const char *file,
 128                           char *buffer, int buffer_length)
 129 {
 130     int len = -1;
 131     char *file_path = mk_file_path(dir, file);
 132
 133     if (file_path != NULL) {
 134         BIO *file_io = BIO_new_file(file_path, "r");
 135
 136         if (file_io != NULL)
 137             len = BIO_read(file_io, buffer, buffer_length);
 138         BIO_free(file_io);
 139     }
 140
 141     OPENSSL_free(file_path);
 142     return len;
 143 }
 144
 145 static int compare_sct_list_printout(STACK_OF(SCT) *sct,
 146                                      const char *expected_output)
 147 {
 148     BIO *text_buffer = NULL;
 149     char *actual_output = NULL;
 150     int result = 0;
 151
 152     if (!TEST_ptr(text_buffer = BIO_new(BIO_s_mem())))
 153         goto end;
 154
 155     SCT_LIST_print(sct, text_buffer, 0, "\n", NULL);
 156
 157     /* Append \0 because we're about to use the buffer contents as a string. */
 158     if (!TEST_true(BIO_write(text_buffer, "\0", 1)))
 159         goto end;
 160
 161     BIO_get_mem_data(text_buffer, &actual_output);
 162     if (!TEST_str_eq(actual_output, expected_output))
 163         goto end;
 164     result = 1;
 165
 166 end:
 167     BIO_free(text_buffer);
 168     return result;
 169 }
 170
 171 static int compare_extension_printout(X509_EXTENSION *extension,
 172                                       const char *expected_output)
 173 {
 174     BIO *text_buffer = NULL;
 175     char *actual_output = NULL;
 176     int result = 0;
 177
 178     if (!TEST_ptr(text_buffer = BIO_new(BIO_s_mem()))
 179             || !TEST_true(X509V3_EXT_print(text_buffer, extension,
 180                                            X509V3_EXT_DEFAULT, 0)))
 181         goto end;
 182
 183     /* Append \0 because we're about to use the buffer contents as a string. */
 184     if (!TEST_true(BIO_write(text_buffer, "\0", 1)))
 185         goto end;
 186
 187     BIO_get_mem_data(text_buffer, &actual_output);
 188     if (!TEST_str_eq(actual_output, expected_output))
 189         goto end;
 190
 191     result = 1;
 192
 193 end:
 194     BIO_free(text_buffer);
 195     return result;
 196 }
 197
 198 static int assert_validity(CT_TEST_FIXTURE *fixture, STACK_OF(SCT) *scts,
 199                            CT_POLICY_EVAL_CTX *policy_ctx)
 200 {
 201     int invalid_sct_count = 0;
 202     int valid_sct_count = 0;
 203     int i;
 204
 205     if (!TEST_int_ge(SCT_LIST_validate(scts, policy_ctx), 0))
 206         return 0;
 207
 208     for (i = 0; i < sk_SCT_num(scts); ++i) {
 209         SCT *sct_i = sk_SCT_value(scts, i);
 210
 211         switch (SCT_get_validation_status(sct_i)) {
 212         case SCT_VALIDATION_STATUS_VALID:
 213             ++valid_sct_count;
 214             break;
 215         case SCT_VALIDATION_STATUS_INVALID:
 216             ++invalid_sct_count;
 217             break;
 218         case SCT_VALIDATION_STATUS_NOT_SET:
 219         case SCT_VALIDATION_STATUS_UNKNOWN_LOG:
 220         case SCT_VALIDATION_STATUS_UNVERIFIED:
 221         case SCT_VALIDATION_STATUS_UNKNOWN_VERSION:
 222             /* Ignore other validation statuses. */
 223             break;
 224         }
 225     }
 226
 227     if (!TEST_int_eq(valid_sct_count, fixture->expected_valid_sct_count)) {
 228         int unverified_sct_count = sk_SCT_num(scts) -
 229                                         invalid_sct_count - valid_sct_count;
 230
 231         TEST_info("%d SCTs failed, %d SCTs unverified",
 232                   invalid_sct_count, unverified_sct_count);
 233         return 0;
 234     }
 235
 236     return 1;
 237 }
 238
 239 static int execute_cert_test(CT_TEST_FIXTURE *fixture)
 240 {
 241     int success = 0;
 242     X509 *cert = NULL, *issuer = NULL;
 243     STACK_OF(SCT) *scts = NULL;
 244     SCT *sct = NULL;
 245     char expected_sct_text[CT_TEST_MAX_FILE_SIZE];
 246     int sct_text_len = 0;
 247     unsigned char *tls_sct_list = NULL;
 248     size_t tls_sct_list_len = 0;
 249     CT_POLICY_EVAL_CTX *ct_policy_ctx = CT_POLICY_EVAL_CTX_new();
 250
 251     if (fixture->sct_text_file != NULL) {
 252         sct_text_len = read_text_file(fixture->sct_dir, fixture->sct_text_file,
 253                                       expected_sct_text,
 254                                       CT_TEST_MAX_FILE_SIZE - 1);
 255
 256         if (!TEST_int_ge(sct_text_len, 0))
 257             goto end;
 258         expected_sct_text[sct_text_len] = '\0';
 259     }
 260
 261     CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE(
 262             ct_policy_ctx, fixture->ctlog_store);
 263
 264     CT_POLICY_EVAL_CTX_set_time(ct_policy_ctx, fixture->epoch_time_in_ms);
 265
 266     if (fixture->certificate_file != NULL) {
 267         int sct_extension_index;
 268         int i;
 269         X509_EXTENSION *sct_extension = NULL;
 270
 271         if (!TEST_ptr(cert = load_pem_cert(fixture->certs_dir,
 272                                            fixture->certificate_file)))
 273             goto end;
 274
 275         CT_POLICY_EVAL_CTX_set1_cert(ct_policy_ctx, cert);
 276
 277         if (fixture->issuer_file != NULL) {
 278             if (!TEST_ptr(issuer = load_pem_cert(fixture->certs_dir,
 279                                                  fixture->issuer_file)))
 280                 goto end;
 281             CT_POLICY_EVAL_CTX_set1_issuer(ct_policy_ctx, issuer);
 282         }
 283
 284         sct_extension_index =
 285                 X509_get_ext_by_NID(cert, NID_ct_precert_scts, -1);
 286         sct_extension = X509_get_ext(cert, sct_extension_index);
 287         if (fixture->expected_sct_count > 0) {
 288             if (!TEST_ptr(sct_extension))
 289                 goto end;
 290
 291             if (fixture->sct_text_file
 292                 && !compare_extension_printout(sct_extension,
 293                                                expected_sct_text))
 294                     goto end;
 295
 296             scts = X509V3_EXT_d2i(sct_extension);
 297             for (i = 0; i < sk_SCT_num(scts); ++i) {
 298                 SCT *sct_i = sk_SCT_value(scts, i);
 299
 300                 if (!TEST_int_eq(SCT_get_source(sct_i), SCT_SOURCE_X509V3_EXTENSION)) {
 301                     goto end;
 302                 }
 303             }
 304
 305             if (fixture->test_validity) {
 306                 if (!assert_validity(fixture, scts, ct_policy_ctx))
 307                     goto end;
 308             }
 309         } else if (!TEST_ptr_null(sct_extension)) {
 310             goto end;
 311         }
 312     }
 313
 314     if (fixture->tls_sct_list != NULL) {
 315         const unsigned char *p = fixture->tls_sct_list;
 316
 317         if (!TEST_ptr(o2i_SCT_LIST(&scts, &p, fixture->tls_sct_list_len)))
 318             goto end;
 319
 320         if (fixture->test_validity && cert != NULL) {
 321             if (!assert_validity(fixture, scts, ct_policy_ctx))
 322                 goto end;
 323         }
 324
 325         if (fixture->sct_text_file
 326             && !compare_sct_list_printout(scts, expected_sct_text)) {
 327                 goto end;
 328         }
 329
 330         tls_sct_list_len = i2o_SCT_LIST(scts, &tls_sct_list);
 331         if (!TEST_mem_eq(fixture->tls_sct_list, fixture->tls_sct_list_len,
 332                          tls_sct_list, tls_sct_list_len))
 333             goto end;
 334     }
 335     success = 1;
 336
 337 end:
 338     X509_free(cert);
 339     X509_free(issuer);
 340     SCT_LIST_free(scts);
 341     SCT_free(sct);
 342     CT_POLICY_EVAL_CTX_free(ct_policy_ctx);
 343     OPENSSL_free(tls_sct_list);
 344     return success;
 345 }
 346
 347 # define SETUP_CT_TEST_FIXTURE() SETUP_TEST_FIXTURE(CT_TEST_FIXTURE, set_up)
 348 # define EXECUTE_CT_TEST() EXECUTE_TEST(execute_cert_test, tear_down)
 349
 350 static int test_no_scts_in_certificate(void)
 351 {
 352     SETUP_CT_TEST_FIXTURE();
 353     if (fixture == NULL)
 354         return 0;
 355     fixture->certs_dir = certs_dir;
 356     fixture->certificate_file = "leaf.pem";
 357     fixture->issuer_file = "subinterCA.pem";
 358     fixture->expected_sct_count = 0;
 359     EXECUTE_CT_TEST();
 360     return result;
 361 }
 362
 363 static int test_one_sct_in_certificate(void)
 364 {
 365     SETUP_CT_TEST_FIXTURE();
 366     if (fixture == NULL)
 367         return 0;
 368     fixture->certs_dir = certs_dir;
 369     fixture->certificate_file = "embeddedSCTs1.pem";
 370     fixture->issuer_file = "embeddedSCTs1_issuer.pem";
 371     fixture->expected_sct_count = 1;
 372     fixture->sct_dir = certs_dir;
 373     fixture->sct_text_file = "embeddedSCTs1.sct";
 374     EXECUTE_CT_TEST();
 375     return result;
 376 }
 377
 378 static int test_multiple_scts_in_certificate(void)
 379 {
 380     SETUP_CT_TEST_FIXTURE();
 381     if (fixture == NULL)
 382         return 0;
 383     fixture->certs_dir = certs_dir;
 384     fixture->certificate_file = "embeddedSCTs3.pem";
 385     fixture->issuer_file = "embeddedSCTs3_issuer.pem";
 386     fixture->expected_sct_count = 3;
 387     fixture->sct_dir = certs_dir;
 388     fixture->sct_text_file = "embeddedSCTs3.sct";
 389     EXECUTE_CT_TEST();
 390     return result;
 391 }
 392
 393 static int test_verify_one_sct(void)
 394 {
 395     SETUP_CT_TEST_FIXTURE();
 396     if (fixture == NULL)
 397         return 0;
 398     fixture->certs_dir = certs_dir;
 399     fixture->certificate_file = "embeddedSCTs1.pem";
 400     fixture->issuer_file = "embeddedSCTs1_issuer.pem";
 401     fixture->expected_sct_count = fixture->expected_valid_sct_count = 1;
 402     fixture->test_validity = 1;
 403     EXECUTE_CT_TEST();
 404     return result;
 405 }
 406
 407 static int test_verify_multiple_scts(void)
 408 {
 409     SETUP_CT_TEST_FIXTURE();
 410     if (fixture == NULL)
 411         return 0;
 412     fixture->certs_dir = certs_dir;
 413     fixture->certificate_file = "embeddedSCTs3.pem";
 414     fixture->issuer_file = "embeddedSCTs3_issuer.pem";
 415     fixture->expected_sct_count = fixture->expected_valid_sct_count = 3;
 416     fixture->test_validity = 1;
 417     EXECUTE_CT_TEST();
 418     return result;
 419 }
 420
 421 static int test_verify_fails_for_future_sct(void)
 422 {
 423     SETUP_CT_TEST_FIXTURE();
 424     if (fixture == NULL)
 425         return 0;
 426     fixture->epoch_time_in_ms = 1365094800000; /* Apr 4 17:00:00 2013 GMT */
 427     fixture->certs_dir = certs_dir;
 428     fixture->certificate_file = "embeddedSCTs1.pem";
 429     fixture->issuer_file = "embeddedSCTs1_issuer.pem";
 430     fixture->expected_sct_count = 1;
 431     fixture->expected_valid_sct_count = 0;
 432     fixture->test_validity = 1;
 433     EXECUTE_CT_TEST();
 434     return result;
 435 }
 436
 437 static int test_decode_tls_sct(void)
 438 {
 439     const unsigned char tls_sct_list[] = "\x00\x78" /* length of list */
 440         "\x00\x76"
 441         "\x00" /* version */
 442         /* log ID */
 443         "\xDF\x1C\x2E\xC1\x15\x00\x94\x52\x47\xA9\x61\x68\x32\x5D\xDC\x5C\x79"
 444         "\x59\xE8\xF7\xC6\xD3\x88\xFC\x00\x2E\x0B\xBD\x3F\x74\xD7\x64"
 445         "\x00\x00\x01\x3D\xDB\x27\xDF\x93" /* timestamp */
 446         "\x00\x00" /* extensions length */
 447         "" /* extensions */
 448         "\x04\x03" /* hash and signature algorithms */
 449         "\x00\x47" /* signature length */
 450         /* signature */
 451         "\x30\x45\x02\x20\x48\x2F\x67\x51\xAF\x35\xDB\xA6\x54\x36\xBE\x1F\xD6"
 452         "\x64\x0F\x3D\xBF\x9A\x41\x42\x94\x95\x92\x45\x30\x28\x8F\xA3\xE5\xE2"
 453         "\x3E\x06\x02\x21\x00\xE4\xED\xC0\xDB\x3A\xC5\x72\xB1\xE2\xF5\xE8\xAB"
 454         "\x6A\x68\x06\x53\x98\x7D\xCF\x41\x02\x7D\xFE\xFF\xA1\x05\x51\x9D\x89"
 455         "\xED\xBF\x08";
 456
 457     SETUP_CT_TEST_FIXTURE();
 458     if (fixture == NULL)
 459         return 0;
 460     fixture->tls_sct_list = tls_sct_list;
 461     fixture->tls_sct_list_len = 0x7a;
 462     fixture->sct_dir = ct_dir;
 463     fixture->sct_text_file = "tls1.sct";
 464     EXECUTE_CT_TEST();
 465     return result;
 466 }
 467
 468 static int test_encode_tls_sct(void)
 469 {
 470     const char log_id[] = "3xwuwRUAlFJHqWFoMl3cXHlZ6PfG04j8AC4LvT9012Q=";
 471     const uint64_t timestamp = 1;
 472     const char extensions[] = "";
 473     const char signature[] = "BAMARzBAMiBIL2dRrzXbplQ2vh/WZA89v5pBQpSVkkUwKI+j5"
 474             "eI+BgIhAOTtwNs6xXKx4vXoq2poBlOYfc9BAn3+/6EFUZ2J7b8I";
 475     SCT *sct = NULL;
 476
 477     SETUP_CT_TEST_FIXTURE();
 478     if (fixture == NULL)
 479         return 0;
 480
 481     fixture->sct_list = sk_SCT_new_null();
 482     if (!TEST_ptr(sct = SCT_new_from_base64(SCT_VERSION_V1, log_id,
 483                                             CT_LOG_ENTRY_TYPE_X509, timestamp,
 484                                             extensions, signature)))
 485
 486         return 0;
 487
 488     sk_SCT_push(fixture->sct_list, sct);
 489     fixture->sct_dir = ct_dir;
 490     fixture->sct_text_file = "tls1.sct";
 491     EXECUTE_CT_TEST();
 492     return result;
 493 }
 494
 495 /*
 496  * Tests that the CT_POLICY_EVAL_CTX default time is approximately now.
 497  * Allow +-10 minutes, as it may compensate for clock skew.
 498  */
 499 static int test_default_ct_policy_eval_ctx_time_is_now(void)
 500 {
 501     int success = 0;
 502     CT_POLICY_EVAL_CTX *ct_policy_ctx = CT_POLICY_EVAL_CTX_new();
 503     const time_t default_time = CT_POLICY_EVAL_CTX_get_time(ct_policy_ctx) /
 504                                 1000;
 505     const time_t time_tolerance = 600;  /* 10 minutes */
 506
 507     if (!TEST_uint_le((unsigned int)fabs(difftime(time(NULL), default_time)),
 508                       (unsigned int)time_tolerance))
 509         goto end;
 510
 511     success = 1;
 512 end:
 513     CT_POLICY_EVAL_CTX_free(ct_policy_ctx);
 514     return success;
 515 }
 516
 517 static int test_ctlog_from_base64(void)
 518 {
 519     CTLOG *ctlogp = NULL;
 520     const char notb64[] = "\01\02\03\04";
 521     const char pad[] = "====";
 522     const char name[] = "name";
 523
 524     /* We expect these to both fail! */
 525     if (!TEST_true(!CTLOG_new_from_base64(&ctlogp, notb64, name))
 526         || !TEST_true(!CTLOG_new_from_base64(&ctlogp, pad, name)))
 527         return 0;
 528     return 1;
 529 }
 530 #endif
 531
 532 int setup_tests(void)
 533 {
 534 #ifndef OPENSSL_NO_CT
 535     if ((ct_dir = getenv("CT_DIR")) == NULL)
 536         ct_dir = "ct";
 537     if ((certs_dir = getenv("CERTS_DIR")) == NULL)
 538         certs_dir = "certs";
 539
 540     ADD_TEST(test_no_scts_in_certificate);
 541     ADD_TEST(test_one_sct_in_certificate);
 542     ADD_TEST(test_multiple_scts_in_certificate);
 543     ADD_TEST(test_verify_one_sct);
 544     ADD_TEST(test_verify_multiple_scts);
 545     ADD_TEST(test_verify_fails_for_future_sct);
 546     ADD_TEST(test_decode_tls_sct);
 547     ADD_TEST(test_encode_tls_sct);
 548     ADD_TEST(test_default_ct_policy_eval_ctx_time_is_now);
 549     ADD_TEST(test_ctlog_from_base64);
 550 #else
 551     printf("No CT support\n");
 552 #endif
 553     return 1;
 554 }