Tests for parsing and printing certificates containing SCTs

Reviewed-by: NBen Laurie <ben@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>

test/Makefile.in

@@ -81,6 +81,7 @@ SSLSESSIONTICKTEST= 	sslsessionticktest
 SSLSKEWITH0PTEST=	sslskewith0ptest
 ASYNCTEST=	asynctest
 DTLSV1LISTENTEST = dtlsv1listentest
+CTTEST=	ct_test
 
 TESTS=		alltests
 
@@ -102,7 +103,7 @@ EXE=	$(NPTEST)$(EXE_EXT) $(MEMLEAKTEST)$(EXE_EXT) \
 	$(HEARTBEATTEST)$(EXE_EXT) $(P5_CRPT2_TEST)$(EXE_EXT) \
 	$(CONSTTIMETEST)$(EXE_EXT) $(VERIFYEXTRATEST)$(EXE_EXT) \
 	$(CLIENTHELLOTEST)$(EXE_EXT) $(PACKETTEST)$(EXE_EXT) $(ASYNCTEST)$(EXE_EXT) \
-	$(DTLSV1LISTENTEST)$(EXE_EXT)
+	$(DTLSV1LISTENTEST)$(EXE_EXT) $(CTTEST)$(EXE_EXT)
 
 # $(METHTEST)$(EXE_EXT)
 
@@ -119,7 +120,7 @@ OBJ=	$(NPTEST).o $(MEMLEAKTEST).o \
 	$(EVPTEST).o $(EVPEXTRATEST).o $(IGETEST).o $(V3NAMETEST).o \
 	$(HEARTBEATTEST).o $(P5_CRPT2_TEST).o \
 	$(CONSTTIMETEST).o $(VERIFYEXTRATEST).o $(CLIENTHELLOTEST).o \
-	$(PACKETTEST).o $(ASYNCTEST).o $(DTLSV1LISTENTEST).o testutil.o
+	$(PACKETTEST).o $(ASYNCTEST).o $(DTLSV1LISTENTEST).o $(CTTEST).o testutil.o
 
 SRC=	$(NPTEST).c $(MEMLEAKTEST).c \
 	$(BNTEST).c $(ECTEST).c \
@@ -133,7 +134,7 @@ SRC=	$(NPTEST).c $(MEMLEAKTEST).c \
 	$(EVPTEST).c $(EVPEXTRATEST).c $(IGETEST).c $(V3NAMETEST).c \
 	$(HEARTBEATTEST).c $(P5_CRPT2_TEST).c \
 	$(CONSTTIMETEST).c $(VERIFYEXTRATEST).c $(CLIENTHELLOTEST).c \
-	$(PACKETTEST).c $(ASYNCTEST).c $(DTLSV1LISTENTEST).c testutil.c
+	$(PACKETTEST).c $(ASYNCTEST).c $(DTLSV1LISTENTEST).c $(CTTEST).c testutil.c
 
 HEADER=	testutil.h
 
@@ -369,6 +370,9 @@ $(ASYNCTEST)$(EXE_EXT): $(ASYNCTEST).o
 $(DTLSV1LISTENTEST)$(EXE_EXT): $(DTLSV1LISTENTEST).o
 	@target=$(DTLSV1LISTENTEST) $(BUILD_CMD)
 
+$(CTTEST)$(EXE_EXT): $(CTTEST).o testutil.o
+	@target=$(CTTEST) testutil=testutil.o;  $(BUILD_CMD)
+
 dummytest$(EXE_EXT): dummytest.o $(DLIBCRYPTO)
 	@target=dummytest; $(BUILD_CMD)
 

test/certs/embeddedSCTs1.pem

+-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

test/certs/embeddedSCTs1.sct

+Signed Certificate Timestamp:
+    Version   : v1 (0x0)
+    Log ID    : DF:1C:2E:C1:15:00:94:52:47:A9:61:68:32:5D:DC:5C:
+                79:59:E8:F7:C6:D3:88:FC:00:2E:0B:BD:3F:74:D7:64
+    Timestamp : Apr  5 17:04:16.275 2013 GMT
+    Extensions: none
+    Signature : ecdsa-with-SHA256
+                30:45:02:20:48:2F:67:51:AF:35:DB:A6:54:36:BE:1F:
+                D6:64:0F:3D:BF:9A:41:42:94:95:92:45:30:28:8F:A3:
+                E5:E2:3E:06:02:21:00:E4:ED:C0:DB:3A:C5:72:B1:E2:
+                F5:E8:AB:6A:68:06:53:98:7D:CF:41:02:7D:FE:FF:A1:
+                05:51:9D:89:ED:BF:08
\ No newline at end of file

test/certs/embeddedSCTs3.pem

+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

test/certs/embeddedSCTs3.sct

+Signed Certificate Timestamp:
+    Version   : v1 (0x0)
+    Log ID    : 68:F6:98:F8:1F:64:82:BE:3A:8C:EE:B9:28:1D:4C:FC:
+                71:51:5D:67:93:D4:44:D1:0A:67:AC:BB:4F:4F:FB:C4
+    Timestamp : Dec  1 13:31:25.961 2015 GMT
+    Extensions: none
+    Signature : ecdsa-with-SHA256
+                30:44:02:20:58:2D:0A:BE:78:41:8A:E7:89:A9:5E:66:
+                21:C5:6A:16:79:DF:33:85:8A:D3:F3:1D:71:AF:75:30:
+                FB:CC:4E:45:02:20:41:9C:89:B8:80:19:87:46:6C:1C:
+                3A:95:0B:BE:F4:98:75:D4:CA:49:97:FD:25:2E:E3:78:
+                B5:36:30:20:26:4D
+Signed Certificate Timestamp:
+    Version   : v1 (0x0)
+    Log ID    : 56:14:06:9A:2F:D7:C2:EC:D3:F5:E1:BD:44:B2:3E:C7:
+                46:76:B9:BC:99:11:5C:C0:EF:94:98:55:D6:89:D0:DD
+    Timestamp : Dec  1 13:31:25.352 2015 GMT
+    Extensions: none
+    Signature : ecdsa-with-SHA256
+                30:45:02:20:79:68:E9:70:38:5A:63:F3:A6:B1:97:0E:
+                7E:D0:C5:71:1B:76:06:CB:09:63:48:1E:E1:20:F3:A7:
+                EF:2A:4E:74:02:21:00:8E:B7:BB:ED:85:5D:85:1B:54:
+                5E:3C:C5:EC:F2:13:9C:09:D1:0A:01:C2:59:5F:7C:31:
+                19:A1:9D:E1:17:C7:1F
+Signed Certificate Timestamp:
+    Version   : v1 (0x0)
+    Log ID    : A4:B9:09:90:B4:18:58:14:87:BB:13:A2:CC:67:70:0A:
+                3C:35:98:04:F9:1B:DF:B8:E3:77:CD:0E:C8:0D:DC:10
+    Timestamp : Dec  1 13:31:25.980 2015 GMT
+    Extensions: none
+    Signature : ecdsa-with-SHA256
+                30:45:02:20:2B:06:42:0F:D9:71:BD:21:42:A5:F9:C5:
+                55:83:D2:9D:E5:A1:8D:B6:3D:A6:73:89:42:32:9C:91:
+                0F:3B:6A:74:02:21:00:86:EE:10:F9:10:E6:7B:17:65:
+                D9:2D:37:53:4A:3B:F0:AE:03:E4:21:76:37:EF:AF:B4:
+                44:2E:2B:F5:5C:C6:91
\ No newline at end of file

test/ct/tls1.sct

+Signed Certificate Timestamp:
+    Version   : v1 (0x0)
+    Log ID    : DF:1C:2E:C1:15:00:94:52:47:A9:61:68:32:5D:DC:5C:
+                79:59:E8:F7:C6:D3:88:FC:00:2E:0B:BD:3F:74:D7:64
+    Timestamp : Apr  5 17:04:16.275 2013 GMT
+    Extensions: none
+    Signature : ecdsa-with-SHA256
+                30:45:02:20:48:2F:67:51:AF:35:DB:A6:54:36:BE:1F:
+                D6:64:0F:3D:BF:9A:41:42:94:95:92:45:30:28:8F:A3:
+                E5:E2:3E:06:02:21:00:E4:ED:C0:DB:3A:C5:72:B1:E2:
+                F5:E8:AB:6A:68:06:53:98:7D:CF:41:02:7D:FE:FF:A1:
+                05:51:9D:89:ED:BF:08
\ No newline at end of file

test/ct_test.c

+/*
+ * Tests the Certificate Transparency public and internal APIs.
+ *
+ * Author:    Rob Percival (robpercival@google.com)
+ * Date:        2016-01-26
+ *
+ * ====================================================================
+ * Copyright (c) 2016 The OpenSSL Project.    All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *        notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *        notice, this list of conditions and the following disclaimer in
+ *        the documentation and/or other materials provided with the
+ *        distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *        software must display the following acknowledgment:
+ *        "This product includes software developed by the OpenSSL Project
+ *        for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *        endorse or promote products derived from this software without
+ *        prior written permission. For written permission, please contact
+ *        licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *        nor may "OpenSSL" appear in their names without prior written
+ *        permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *        acknowledgment:
+ *        "This product includes software developed by the OpenSSL Project
+ *        for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.    IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "crypto/include/internal/ct_int.h"
+#include "openssl/err.h"
+#include "openssl/safestack.h"
+#include "openssl/ssl.h"
+#include "openssl/x509.h"
+#include "openssl/x509v3.h"
+#include "testutil.h"
+
+#if !defined(OPENSSL_NO_CT) && !defined(OPENSSL_NO_UNIT_TEST)
+
+/* Used when declaring buffers to read text files into */
+#define CT_TEST_MAX_FILE_SIZE 8096
+
+typedef struct ct_test_fixture {
+    const char *test_case_name;
+    /* Set the following to test handling of SCTs in X509 certificates */
+    const char *certificate_file_path;
+    size_t expected_sct_count;
+    /* Set the following to test handling of SCTs in TLS format */
+    const uint8_t *tls_sct;
+    size_t tls_sct_len;
+    const SCT *sct;
+    /*
+     * 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_text_file_path;
+
+} CT_TEST_FIXTURE;
+
+static CT_TEST_FIXTURE set_up(const char *const test_case_name)
+{
+    CT_TEST_FIXTURE fixture;
+    int setup_ok = 1;
+
+    memset(&fixture, 0, sizeof(fixture));
+    fixture.test_case_name = test_case_name;
+
+    if (!setup_ok) {
+        exit(EXIT_FAILURE);
+    }
+    return fixture;
+}
+
+static void tear_down(CT_TEST_FIXTURE fixture)
+{
+    ERR_print_errors_fp(stderr);
+}
+
+static X509 *load_pem_cert(const char *file)
+{
+    BIO *cert_io = BIO_new_file(file, "r");
+    X509 *cert = NULL;
+
+    if (cert_io == NULL) goto end;
+
+    cert = PEM_read_bio_X509(cert_io, NULL, NULL, NULL);
+
+end:
+    BIO_free(cert_io);
+    return cert;
+}
+
+static int read_text_file(const char *path, char *buffer, int buffer_length)
+{
+    BIO *file = BIO_new_file(path, "r");
+    int result = -1;
+
+    if (file != NULL) {
+        result = BIO_read(file, buffer, buffer_length);
+        BIO_free(file);
+    }
+
+    return result;
+}
+
+static int compare_sct_printout(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_print(sct, text_buffer, 0);
+
+    /* 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 execute_cert_test(CT_TEST_FIXTURE fixture)
+{
+    int result = 0;
+    X509 *cert = NULL;
+    SCT *sct = NULL;
+    char expected_sct_text[CT_TEST_MAX_FILE_SIZE];
+    int sct_text_len = 0;
+
+    if (fixture.sct_text_file_path != NULL) {
+        sct_text_len = read_text_file(
+            fixture.sct_text_file_path,
+            expected_sct_text,
+            CT_TEST_MAX_FILE_SIZE - 1);
+
+        if (sct_text_len < 0) {
+            result = 1;
+            fprintf(stderr, "Test data file not found: %s\n",
+                fixture.sct_text_file_path);
+            goto end;
+        }
+
+        expected_sct_text[sct_text_len] = '\0';
+    }
+
+    if (fixture.certificate_file_path != NULL) {
+        int sct_extension_index;
+        X509_EXTENSION *sct_extension = NULL;
+        cert = load_pem_cert(fixture.certificate_file_path);
+
+        if (cert == NULL) {
+            result = 1;
+            fprintf(stderr, "Unable to load certificate: %s\n",
+                fixture.certificate_file_path);
+            goto end;
+        }
+
+        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) {
+                result = 1;
+                fprintf(stderr, "SCT extension not found in: %s\n",
+                    fixture.certificate_file_path);
+                goto end;
+            }
+
+            if (fixture.sct_text_file_path) {
+                result = compare_extension_printout(sct_extension,
+                                                    expected_sct_text);
+                if (result != 0)
+                    goto end;
+            }
+        } else if (sct_extension != NULL) {
+            result = 1;
+            fprintf(stderr, "Expected no SCTs, but found SCT extension in: %s\n",
+                fixture.certificate_file_path);
+            goto end;
+        }
+    }
+
+    if (fixture.tls_sct != NULL) {
+        const unsigned char *p = fixture.tls_sct;
+        unsigned char *tls_sct;
+        size_t tls_sct_len;
+        if (o2i_SCT(&sct, &p, fixture.tls_sct_len) == NULL) {
+            result = 1;
+            fprintf(stderr, "Failed to decode SCT from TLS format\n");
+            goto end;
+        }
+
+        if (fixture.sct_text_file_path) {
+            result = compare_sct_printout(sct, expected_sct_text);
+            if (result != 0)
+                goto end;
+        }
+
+        tls_sct_len = i2o_SCT(sct, &tls_sct);
+        if (tls_sct_len != fixture.tls_sct_len ||
+            memcmp(fixture.tls_sct, tls_sct, tls_sct_len) != 0) {
+            result = 1;
+            fprintf(stderr, "Failed to encode SCT into TLS format correctly\n");
+            goto end;
+        }
+    }
+
+end:
+    X509_free(cert);
+    SCT_free(sct);
+    return result;
+}
+
+#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.certificate_file_path = "certs/leaf.pem";
+    fixture.expected_sct_count = 0;
+    EXECUTE_CT_TEST();
+}
+
+static int test_one_sct_in_certificate()
+{
+    SETUP_CT_TEST_FIXTURE();
+    fixture.certificate_file_path = "certs/embeddedSCTs1.pem";
+    fixture.expected_sct_count = 1;
+    fixture.sct_text_file_path = "certs/embeddedSCTs1.sct";
+    EXECUTE_CT_TEST();
+}
+
+static int test_multiple_scts_in_certificate()
+{
+    SETUP_CT_TEST_FIXTURE();
+    fixture.certificate_file_path = "certs/embeddedSCTs3.pem";
+    fixture.expected_sct_count = 3;
+    fixture.sct_text_file_path = "certs/embeddedSCTs3.sct";
+    EXECUTE_CT_TEST();
+}
+
+static int test_decode_tls_sct()
+{
+    SETUP_CT_TEST_FIXTURE();
+    fixture.tls_sct = (unsigned char *)
+        "\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 */
+        "\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"; /* signature */
+    fixture.tls_sct_len = 118;
+    fixture.sct_text_file_path = "ct/tls1.sct";
+    EXECUTE_CT_TEST();
+}
+
+static int test_encode_tls_sct()
+{
+    SETUP_CT_TEST_FIXTURE();
+
+    SCT *sct = SCT_new();
+    SCT_set_version(sct, 0);
+    SCT_set1_log_id(sct, (unsigned char *)
+        "\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", 32);
+    SCT_set_timestamp(sct, 1);
+    SCT_set1_extensions(sct, (unsigned char *)"", 0);
+    SCT_set_signature_nid(sct, NID_ecdsa_with_SHA256);
+    SCT_set1_signature(sct, (unsigned char *)
+        "\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", 71);
+    fixture.sct = sct;
+    fixture.sct_text_file_path = "ct/tls1.sct";
+    EXECUTE_CT_TEST();
+
+    SCT_free(sct);
+}
+
+int main(int argc, char *argv[])
+{
+    int result = 0;
+
+    ADD_TEST(test_no_scts_in_certificate);
+    ADD_TEST(test_one_sct_in_certificate);
+    ADD_TEST(test_multiple_scts_in_certificate);
+    ADD_TEST(test_decode_tls_sct);
+    ADD_TEST(test_encode_tls_sct);
+
+    result = run_tests(argv[0]);
+    ERR_print_errors_fp(stderr);
+
+    return result;
+}
+
+#else /* OPENSSL_NO_CT */
+
+int main(int argc, char* argv[])
+{
+    return EXIT_SUCCESS;
+}
+
+#endif /* OPENSSL_NO_CT */

test/recipes/80-test_ct.t

+#! /usr/bin/perl
+
+use OpenSSL::Test::Simple;
+
+simple_test("test_ct", "ct_test");
+