CRL critical extension bugfix

More importantly, port CRL test from boringSSL crypto/x509/x509_test.cc

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1775)

1 files changed, 372 insertions, 0 deletions

diff --git a/test/crltest.c b/test/crltest.c
new file mode 100644
index 0000000000..d95f0608e3
--- /dev/null
+++ b/test/crltest.c
@@ -0,0 +1,372 @@
+/*
+ * Copyright 2015-2016 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 <stdio.h>
+#include "../e_os.h"
+#include <string.h>
+#include <openssl/bio.h>
+#include <openssl/crypto.h>
+#include <openssl/err.h>
+#include <openssl/pem.h>
+#include <openssl/x509.h>
+
+#include "testutil.h"
+#include "test_main.h"
+
+static const char *kCRLTestRoot[] = {
+    "-----BEGIN CERTIFICATE-----\n",
+    "MIIDbzCCAlegAwIBAgIJAODri7v0dDUFMA0GCSqGSIb3DQEBCwUAME4xCzAJBgNV\n",
+    "BAYTAlVTMRMwEQYDVQQIDApDYWxpZm9ybmlhMRYwFAYDVQQHDA1Nb3VudGFpbiBW\n",
+    "aWV3MRIwEAYDVQQKDAlCb3JpbmdTU0wwHhcNMTYwOTI2MTUwNjI2WhcNMjYwOTI0\n",
+    "MTUwNjI2WjBOMQswCQYDVQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQG\n",
+    "A1UEBwwNTW91bnRhaW4gVmlldzESMBAGA1UECgwJQm9yaW5nU1NMMIIBIjANBgkq\n",
+    "hkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAo16WiLWZuaymsD8n5SKPmxV1y6jjgr3B\n",
+    "S/dUBpbrzd1aeFzNlI8l2jfAnzUyp+I21RQ+nh/MhqjGElkTtK9xMn1Y+S9GMRh+\n",
+    "5R/Du0iCb1tCZIPY07Tgrb0KMNWe0v2QKVVruuYSgxIWodBfxlKO64Z8AJ5IbnWp\n",
+    "uRqO6rctN9qUoMlTIAB6dL4G0tDJ/PGFWOJYwOMEIX54bly2wgyYJVBKiRRt4f7n\n",
+    "8H922qmvPNA9idmX9G1VAtgV6x97XXi7ULORIQvn9lVQF6nTYDBJhyuPB+mLThbL\n",
+    "P2o9orxGx7aCtnnBZUIxUvHNOI0FaSaZH7Fi0xsZ/GkG2HZe7ImPJwIDAQABo1Aw\n",
+    "TjAdBgNVHQ4EFgQUWPt3N5cZ/CRvubbrkqfBnAqhq94wHwYDVR0jBBgwFoAUWPt3\n",
+    "N5cZ/CRvubbrkqfBnAqhq94wDAYDVR0TBAUwAwEB/zANBgkqhkiG9w0BAQsFAAOC\n",
+    "AQEAORu6M0MOwXy+3VEBwNilfTxyqDfruQsc1jA4PT8Oe8zora1WxE1JB4q2FJOz\n",
+    "EAuM3H/NXvEnBuN+ITvKZAJUfm4NKX97qmjMJwLKWe1gVv+VQTr63aR7mgWJReQN\n",
+    "XdMztlVeZs2dppV6uEg3ia1X0G7LARxGpA9ETbMyCpb39XxlYuTClcbA5ftDN99B\n",
+    "3Xg9KNdd++Ew22O3HWRDvdDpTO/JkzQfzi3sYwUtzMEonENhczJhGf7bQMmvL/w5\n",
+    "24Wxj4Z7KzzWIHsNqE/RIs6RV3fcW61j/mRgW2XyoWnMVeBzvcJr9NXp4VQYmFPw\n",
+    "amd8GKMZQvP0ufGnUn7D7uartA==\n",
+    "-----END CERTIFICATE-----\n",
+    NULL
+};
+
+static const char *kCRLTestLeaf[] = {
+    "-----BEGIN CERTIFICATE-----\n",
+    "MIIDkDCCAnigAwIBAgICEAAwDQYJKoZIhvcNAQELBQAwTjELMAkGA1UEBhMCVVMx\n",
+    "EzARBgNVBAgMCkNhbGlmb3JuaWExFjAUBgNVBAcMDU1vdW50YWluIFZpZXcxEjAQ\n",
+    "BgNVBAoMCUJvcmluZ1NTTDAeFw0xNjA5MjYxNTA4MzFaFw0xNzA5MjYxNTA4MzFa\n",
+    "MEsxCzAJBgNVBAYTAlVTMRMwEQYDVQQIDApDYWxpZm9ybmlhMRIwEAYDVQQKDAlC\n",
+    "b3JpbmdTU0wxEzARBgNVBAMMCmJvcmluZy5zc2wwggEiMA0GCSqGSIb3DQEBAQUA\n",
+    "A4IBDwAwggEKAoIBAQDc5v1S1M0W+QWM+raWfO0LH8uvqEwuJQgODqMaGnSlWUx9\n",
+    "8iQcnWfjyPja3lWg9K62hSOFDuSyEkysKHDxijz5R93CfLcfnVXjWQDJe7EJTTDP\n",
+    "ozEvxN6RjAeYv7CF000euYr3QT5iyBjg76+bon1p0jHZBJeNPP1KqGYgyxp+hzpx\n",
+    "e0gZmTlGAXd8JQK4v8kpdYwD6PPifFL/jpmQpqOtQmH/6zcLjY4ojmqpEdBqIKIX\n",
+    "+saA29hMq0+NK3K+wgg31RU+cVWxu3tLOIiesETkeDgArjWRS1Vkzbi4v9SJxtNu\n",
+    "OZuAxWiynRJw3JwH/OFHYZIvQqz68ZBoj96cepjPAgMBAAGjezB5MAkGA1UdEwQC\n",
+    "MAAwLAYJYIZIAYb4QgENBB8WHU9wZW5TU0wgR2VuZXJhdGVkIENlcnRpZmljYXRl\n",
+    "MB0GA1UdDgQWBBTGn0OVVh/aoYt0bvEKG+PIERqnDzAfBgNVHSMEGDAWgBRY+3c3\n",
+    "lxn8JG+5tuuSp8GcCqGr3jANBgkqhkiG9w0BAQsFAAOCAQEAd2nM8gCQN2Dc8QJw\n",
+    "XSZXyuI3DBGGCHcay/3iXu0JvTC3EiQo8J6Djv7WLI0N5KH8mkm40u89fJAB2lLZ\n",
+    "ShuHVtcC182bOKnePgwp9CNwQ21p0rDEu/P3X46ZvFgdxx82E9xLa0tBB8PiPDWh\n",
+    "lV16jbaKTgX5AZqjnsyjR5o9/mbZVupZJXx5Syq+XA8qiJfstSYJs4KyKK9UOjql\n",
+    "ICkJVKpi2ahDBqX4MOH4SLfzVk8pqSpviS6yaA1RXqjpkxiN45WWaXDldVHMSkhC\n",
+    "5CNXsXi4b1nAntu89crwSLA3rEwzCWeYj+BX7e1T9rr3oJdwOU/2KQtW1js1yQUG\n",
+    "tjJMFw==\n",
+    "-----END CERTIFICATE-----\n",
+    NULL
+};
+
+static const char *kBasicCRL[] = {
+    "-----BEGIN X509 CRL-----\n",
+    "MIIBpzCBkAIBATANBgkqhkiG9w0BAQsFADBOMQswCQYDVQQGEwJVUzETMBEGA1UE\n",
+    "CAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNTW91bnRhaW4gVmlldzESMBAGA1UECgwJ\n",
+    "Qm9yaW5nU1NMFw0xNjA5MjYxNTEwNTVaFw0xNjEwMjYxNTEwNTVaoA4wDDAKBgNV\n",
+    "HRQEAwIBATANBgkqhkiG9w0BAQsFAAOCAQEAnrBKKgvd9x9zwK9rtUvVeFeJ7+LN\n",
+    "ZEAc+a5oxpPNEsJx6hXoApYEbzXMxuWBQoCs5iEBycSGudct21L+MVf27M38KrWo\n",
+    "eOkq0a2siqViQZO2Fb/SUFR0k9zb8xl86Zf65lgPplALun0bV/HT7MJcl04Tc4os\n",
+    "dsAReBs5nqTGNEd5AlC1iKHvQZkM//MD51DspKnDpsDiUVi54h9C1SpfZmX8H2Vv\n",
+    "diyu0fZ/bPAM3VAGawatf/SyWfBMyKpoPXEG39oAzmjjOj8en82psn7m474IGaho\n",
+    "/vBbhl1ms5qQiLYPjm4YELtnXQoFyC72tBjbdFd/ZE9k4CNKDbxFUXFbkw==\n",
+    "-----END X509 CRL-----\n",
+    NULL
+};
+
+static const char *kRevokedCRL[] = {
+    "-----BEGIN X509 CRL-----\n",
+    "MIIBvjCBpwIBATANBgkqhkiG9w0BAQsFADBOMQswCQYDVQQGEwJVUzETMBEGA1UE\n",
+    "CAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNTW91bnRhaW4gVmlldzESMBAGA1UECgwJ\n",
+    "Qm9yaW5nU1NMFw0xNjA5MjYxNTEyNDRaFw0xNjEwMjYxNTEyNDRaMBUwEwICEAAX\n",
+    "DTE2MDkyNjE1MTIyNlqgDjAMMAoGA1UdFAQDAgECMA0GCSqGSIb3DQEBCwUAA4IB\n",
+    "AQCUGaM4DcWzlQKrcZvI8TMeR8BpsvQeo5BoI/XZu2a8h//PyRyMwYeaOM+3zl0d\n",
+    "sjgCT8b3C1FPgT+P2Lkowv7rJ+FHJRNQkogr+RuqCSPTq65ha4WKlRGWkMFybzVH\n",
+    "NloxC+aU3lgp/NlX9yUtfqYmJek1CDrOOGPrAEAwj1l/BUeYKNGqfBWYJQtPJu+5\n",
+    "OaSvIYGpETCZJscUWODmLEb/O3DM438vLvxonwGqXqS0KX37+CHpUlyhnSovxXxp\n",
+    "Pz4aF+L7OtczxL0GYtD2fR9B7TDMqsNmHXgQrixvvOY7MUdLGbd4RfJL3yA53hyO\n",
+    "xzfKY2TzxLiOmctG0hXFkH5J\n",
+    "-----END X509 CRL-----\n",
+    NULL
+};
+
+static const char *kBadIssuerCRL[] = {
+    "-----BEGIN X509 CRL-----\n",
+    "MIIBwjCBqwIBATANBgkqhkiG9w0BAQsFADBSMQswCQYDVQQGEwJVUzETMBEGA1UE\n",
+    "CAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNTW91bnRhaW4gVmlldzEWMBQGA1UECgwN\n",
+    "Tm90IEJvcmluZ1NTTBcNMTYwOTI2MTUxMjQ0WhcNMTYxMDI2MTUxMjQ0WjAVMBMC\n",
+    "AhAAFw0xNjA5MjYxNTEyMjZaoA4wDDAKBgNVHRQEAwIBAjANBgkqhkiG9w0BAQsF\n",
+    "AAOCAQEAlBmjOA3Fs5UCq3GbyPEzHkfAabL0HqOQaCP12btmvIf/z8kcjMGHmjjP\n",
+    "t85dHbI4Ak/G9wtRT4E/j9i5KML+6yfhRyUTUJKIK/kbqgkj06uuYWuFipURlpDB\n",
+    "cm81RzZaMQvmlN5YKfzZV/clLX6mJiXpNQg6zjhj6wBAMI9ZfwVHmCjRqnwVmCUL\n",
+    "TybvuTmkryGBqREwmSbHFFjg5ixG/ztwzON/Ly78aJ8Bql6ktCl9+/gh6VJcoZ0q\n",
+    "L8V8aT8+Ghfi+zrXM8S9BmLQ9n0fQe0wzKrDZh14EK4sb7zmOzFHSxm3eEXyS98g\n",
+    "Od4cjsc3ymNk88S4jpnLRtIVxZB+SQ==\n",
+    "-----END X509 CRL-----\n",
+    NULL
+};
+
+/*
+ * This is kBasicCRL but with a critical issuing distribution point
+ * extension.
+ */
+static const char *kKnownCriticalCRL[] = {
+    "-----BEGIN X509 CRL-----\n",
+    "MIIBujCBowIBATANBgkqhkiG9w0BAQsFADBOMQswCQYDVQQGEwJVUzETMBEGA1UE\n",
+    "CAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNTW91bnRhaW4gVmlldzESMBAGA1UECgwJ\n",
+    "Qm9yaW5nU1NMFw0xNjA5MjYxNTEwNTVaFw0xNjEwMjYxNTEwNTVaoCEwHzAKBgNV\n",
+    "HRQEAwIBATARBgNVHRwBAf8EBzAFoQMBAf8wDQYJKoZIhvcNAQELBQADggEBAA+3\n",
+    "i+5e5Ub8sccfgOBs6WVJFI9c8gvJjrJ8/dYfFIAuCyeocs7DFXn1n13CRZ+URR/Q\n",
+    "mVWgU28+xeusuSPYFpd9cyYTcVyNUGNTI3lwgcE/yVjPaOmzSZKdPakApRxtpKKQ\n",
+    "NN/56aQz3bnT/ZSHQNciRB8U6jiD9V30t0w+FDTpGaG+7bzzUH3UVF9xf9Ctp60A\n",
+    "3mfLe0scas7owSt4AEFuj2SPvcE7yvdOXbu+IEv21cEJUVExJAbhvIweHXh6yRW+\n",
+    "7VVeiNzdIjkZjyTmAzoXGha4+wbxXyBRbfH+XWcO/H+8nwyG8Gktdu2QB9S9nnIp\n",
+    "o/1TpfOMSGhMyMoyPrk=\n",
+    "-----END X509 CRL-----\n",
+    NULL
+};
+
+/*
+ * kUnknownCriticalCRL is kBasicCRL but with an unknown critical extension.
+ */
+static const char *kUnknownCriticalCRL[] = {
+    "-----BEGIN X509 CRL-----\n",
+    "MIIBvDCBpQIBATANBgkqhkiG9w0BAQsFADBOMQswCQYDVQQGEwJVUzETMBEGA1UE\n",
+    "CAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNTW91bnRhaW4gVmlldzESMBAGA1UECgwJ\n",
+    "Qm9yaW5nU1NMFw0xNjA5MjYxNTEwNTVaFw0xNjEwMjYxNTEwNTVaoCMwITAKBgNV\n",
+    "HRQEAwIBATATBgwqhkiG9xIEAYS3CQABAf8EADANBgkqhkiG9w0BAQsFAAOCAQEA\n",
+    "GvBP0xqL509InMj/3493YVRV+ldTpBv5uTD6jewzf5XdaxEQ/VjTNe5zKnxbpAib\n",
+    "Kf7cwX0PMSkZjx7k7kKdDlEucwVvDoqC+O9aJcqVmM6GDyNb9xENxd0XCXja6MZC\n",
+    "yVgP4AwLauB2vSiEprYJyI1APph3iAEeDm60lTXX/wBM/tupQDDujKh2GPyvBRfJ\n",
+    "+wEDwGg3ICwvu4gO4zeC5qnFR+bpL9t5tOMAQnVZ0NWv+k7mkd2LbHdD44dxrfXC\n",
+    "nhtfERx99SDmC/jtUAJrGhtCO8acr7exCeYcduN7KKCm91OeCJKK6OzWst0Og1DB\n",
+    "kwzzU2rL3G65CrZ7H0SZsQ==\n",
+    "-----END X509 CRL-----\n",
+    NULL
+};
+
+/*
+ * kUnknownCriticalCRL2 is kBasicCRL but with a critical issuing distribution
+ * point extension followed by an unknown critical extension
+ */
+static const char *kUnknownCriticalCRL2[] = {
+    "-----BEGIN X509 CRL-----\n",
+    "MIIBzzCBuAIBATANBgkqhkiG9w0BAQsFADBOMQswCQYDVQQGEwJVUzETMBEGA1UE\n",
+    "CAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNTW91bnRhaW4gVmlldzESMBAGA1UECgwJ\n",
+    "Qm9yaW5nU1NMFw0xNjA5MjYxNTEwNTVaFw0xNjEwMjYxNTEwNTVaoDYwNDAKBgNV\n",
+    "HRQEAwIBATARBgNVHRwBAf8EBzAFoQMBAf8wEwYMKoZIhvcSBAGEtwkAAQH/BAAw\n",
+    "DQYJKoZIhvcNAQELBQADggEBACTcpQC8jXL12JN5YzOcQ64ubQIe0XxRAd30p7qB\n",
+    "BTXGpgqBjrjxRfLms7EBYodEXB2oXMsDq3km0vT1MfYdsDD05S+SQ9CDsq/pUfaC\n",
+    "E2WNI5p8WircRnroYvbN2vkjlRbMd1+yNITohXYXCJwjEOAWOx3XIM10bwPYBv4R\n",
+    "rDobuLHoMgL3yHgMHmAkP7YpkBucNqeBV8cCdeAZLuhXFWi6yfr3r/X18yWbC/r2\n",
+    "2xXdkrSqXLFo7ToyP8YKTgiXpya4x6m53biEYwa2ULlas0igL6DK7wjYZX95Uy7H\n",
+    "GKljn9weIYiMPV/BzGymwfv2EW0preLwtyJNJPaxbdin6Jc=\n",
+    "-----END X509 CRL-----\n",
+    NULL
+};
+
+
+/*
+ * Glue an array of strings together.  Return a BIO and put the string
+ * into |*out| so we can free it.
+ */
+static BIO *glue(const char **pem, char **out)
+{
+    char *dest;
+    int i;
+    size_t s = 0;
+
+    /* Glue the strings together. */
+    for (i = 0; pem[i] != NULL; ++i)
+        s += strlen(pem[i]);
+    dest = *out = OPENSSL_malloc(s + 1);
+    if (dest == NULL)
+        return NULL;
+    for (i = 0; pem[i] != NULL; ++i)
+        dest += strlen(strcpy(dest, pem[i]));
+    return BIO_new_mem_buf(*out, s);
+}
+
+/*
+ * Create a CRL from an array of strings.
+ */
+static X509_CRL *CRL_from_strings(const char **pem)
+{
+    char *p;
+    BIO *b = glue(pem, &p);
+    X509_CRL *crl = PEM_read_bio_X509_CRL(b, NULL, NULL, NULL);
+
+    OPENSSL_free(p);
+    BIO_free(b);
+    return crl;
+}
+
+/*
+ * Create an X509 from an array of strings.
+ */
+static X509 *X509_from_strings(const char **pem)
+{
+    char *p;
+    BIO *b = glue(pem, &p);
+    X509 *x = PEM_read_bio_X509(b, NULL, NULL, NULL);
+
+    OPENSSL_free(p);
+    BIO_free(b);
+    return x;
+}
+
+/*
+ * Verify |leaf| certificate (chained up to |root|).  |crls| if
+ * not NULL, is a list of CRLs to include in the verification. It is
+ * also free'd before returning, which is kinda yucky but convenient.
+ * Returns a value from X509_V_ERR_xxx or X509_V_OK.
+ */
+static int verify(X509 *leaf, X509 *root, STACK_OF(X509_CRL) *crls,
+                  unsigned long flags)
+{
+    X509_STORE_CTX *ctx = X509_STORE_CTX_new();
+    X509_STORE *store = X509_STORE_new();
+    X509_VERIFY_PARAM *param = X509_VERIFY_PARAM_new();
+    STACK_OF(X509) *roots = sk_X509_new_null();
+    int status = X509_V_ERR_UNSPECIFIED;
+
+    if (ctx == NULL || store == NULL || param == NULL || roots == NULL)
+        goto err;
+
+    /* Create a stack; upref the cert because we free it below. */
+    X509_up_ref(root);
+    if (!sk_X509_push(roots, root))
+        goto err;
+
+    if (!X509_STORE_CTX_init(ctx, store, leaf, NULL))
+        goto err;
+    X509_STORE_CTX_set0_trusted_stack(ctx, roots);
+    X509_STORE_CTX_set0_crls(ctx, crls);
+    X509_VERIFY_PARAM_set_time(param, 1474934400 /* Sep 27th, 2016 */);
+    X509_VERIFY_PARAM_set_depth(param, 16);
+    if (flags)
+        X509_VERIFY_PARAM_set_flags(param, flags);
+    X509_STORE_CTX_set0_param(ctx, param);
+
+    ERR_clear_error();
+    status = X509_verify_cert(ctx) == 1 ? X509_V_OK
+                                        : X509_STORE_CTX_get_error(ctx);
+err:
+    sk_X509_pop_free(roots, X509_free);
+    sk_X509_CRL_pop_free(crls, X509_CRL_free);
+    X509_STORE_CTX_free(ctx);
+    X509_STORE_free(store);
+    return status;
+}
+
+/*
+ * Create a stack of CRL's.  Upref each one because we call pop_free on
+ * the stack and need to keep the CRL's around until the test exits.
+ * Yes this crashes on malloc failure; it forces us to debug.
+ */
+static STACK_OF(X509_CRL) *make_CRL_stack(X509_CRL *x1, X509_CRL *x2)
+{
+    STACK_OF(X509_CRL) *sk = sk_X509_CRL_new_null();
+
+    sk_X509_CRL_push(sk, x1);
+    X509_CRL_up_ref(x1);
+    if (x2 != NULL) {
+        sk_X509_CRL_push(sk, x2);
+        X509_CRL_up_ref(x2);
+    }
+    return sk;
+}
+
+static int test_crl()
+{
+    X509 *root = X509_from_strings(kCRLTestRoot);
+    X509 *leaf = X509_from_strings(kCRLTestLeaf);
+    X509_CRL *basic_crl = CRL_from_strings(kBasicCRL);
+    X509_CRL *revoked_crl = CRL_from_strings(kRevokedCRL);
+    X509_CRL *bad_issuer_crl = CRL_from_strings(kBadIssuerCRL);
+    X509_CRL *known_critical_crl = CRL_from_strings(kKnownCriticalCRL);
+    X509_CRL *unknown_critical_crl = CRL_from_strings(kUnknownCriticalCRL);
+    X509_CRL *unknown_critical_crl2 = CRL_from_strings(kUnknownCriticalCRL2);
+    int status = 0;
+
+    if (root == NULL || leaf == NULL || basic_crl == NULL
+            || revoked_crl == NULL || bad_issuer_crl == NULL
+            || known_critical_crl == NULL || unknown_critical_crl == NULL
+            || unknown_critical_crl2 == NULL) {
+        fprintf(stderr, "Failed to parse certificates and CRLs.\n");
+        goto err;
+    }
+
+    if (verify(leaf, root, make_CRL_stack(basic_crl, NULL),
+               X509_V_FLAG_CRL_CHECK) != X509_V_OK) {
+        fprintf(stderr, "Cert with CRL didn't verify.\n");
+        goto err;
+    }
+
+    if (verify(leaf, root, make_CRL_stack(basic_crl, revoked_crl),
+               X509_V_FLAG_CRL_CHECK) != X509_V_ERR_CERT_REVOKED) {
+        fprintf(stderr, "Revoked CRL wasn't checked.\n");
+        goto err;
+    }
+
+    if (verify(leaf, root, NULL,
+               X509_V_FLAG_CRL_CHECK) != X509_V_ERR_UNABLE_TO_GET_CRL) {
+        fprintf(stderr, "CRLs were not required.\n");
+        goto err;
+    }
+
+    if (verify(leaf, root, make_CRL_stack(bad_issuer_crl, NULL),
+               X509_V_FLAG_CRL_CHECK) != X509_V_ERR_UNABLE_TO_GET_CRL) {
+        fprintf(stderr, "Bad CRL issuer was unnoticed.\n");
+        goto err;
+    }
+
+    if (verify(leaf, root, make_CRL_stack(known_critical_crl, NULL),
+               X509_V_FLAG_CRL_CHECK) != X509_V_OK) {
+        fprintf(stderr, "CRL with known critical extension was rejected.\n");
+        goto err;
+    }
+
+    if (verify(leaf, root, make_CRL_stack(unknown_critical_crl, NULL),
+               X509_V_FLAG_CRL_CHECK) !=
+            X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION) {
+        fprintf(stderr, "CRL with unknown critical extension was accepted.\n");
+        goto err;
+    }
+
+    if (verify(leaf, root, make_CRL_stack(unknown_critical_crl2, NULL),
+               X509_V_FLAG_CRL_CHECK) !=
+            X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION) {
+        fprintf(stderr, "CRL with unknown critical extension (2) was accepted.\n");
+        goto err;
+    }
+
+    status = 1;
+
+err:
+    X509_free(root);
+    X509_free(leaf);
+    X509_CRL_free(basic_crl);
+    X509_CRL_free(revoked_crl);
+    X509_CRL_free(bad_issuer_crl);
+    X509_CRL_free(known_critical_crl);
+    X509_CRL_free(unknown_critical_crl);
+    X509_CRL_free(unknown_critical_crl2);
+    return status;
+}
+
+void register_tests(void)
+{
+    ADD_TEST(test_crl);
+}