sslapitest.c

/*
 * Copyright 2016-2018 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 <string.h>

#include <openssl/opensslconf.h>
#include <openssl/bio.h>
#include <openssl/crypto.h>
#include <openssl/ssl.h>
#include <openssl/ocsp.h>
#include <openssl/srp.h>
#include <openssl/txt_db.h>

#include "ssltestlib.h"
#include "testutil.h"
#include "testutil/output.h"
#include "internal/nelem.h"
#include "../ssl/ssl_locl.h"

static char *cert = NULL;
static char *privkey = NULL;
static char *srpvfile = NULL;
static char *tmpfilename = NULL;

#define LOG_BUFFER_SIZE 1024
static char server_log_buffer[LOG_BUFFER_SIZE + 1] = {0};
static size_t server_log_buffer_index = 0;
static char client_log_buffer[LOG_BUFFER_SIZE + 1] = {0};
static size_t client_log_buffer_index = 0;
static int error_writing_log = 0;

#ifndef OPENSSL_NO_OCSP
static const unsigned char orespder[] = "Dummy OCSP Response";
static int ocsp_server_called = 0;
static int ocsp_client_called = 0;

static int cdummyarg = 1;
static X509 *ocspcert = NULL;
#endif

#define NUM_EXTRA_CERTS 40
#define CLIENT_VERSION_LEN      2

/*
 * This structure is used to validate that the correct number of log messages
 * of various types are emitted when emitting secret logs.
 */
struct sslapitest_log_counts {
    unsigned int rsa_key_exchange_count;
    unsigned int master_secret_count;
    unsigned int client_handshake_secret_count;
    unsigned int server_handshake_secret_count;
    unsigned int client_application_secret_count;
    unsigned int server_application_secret_count;
};


static unsigned char serverinfov1[] = {
    0xff, 0xff, /* Dummy extension type */
    0x00, 0x01, /* Extension length is 1 byte */
    0xff        /* Dummy extension data */
};

static unsigned char serverinfov2[] = {
    0x00, 0x00, 0x00,
    (unsigned char)(SSL_EXT_CLIENT_HELLO & 0xff), /* Dummy context - 4 bytes */
    0xff, 0xff, /* Dummy extension type */
    0x00, 0x01, /* Extension length is 1 byte */
    0xff        /* Dummy extension data */
};

static void client_keylog_callback(const SSL *ssl, const char *line)
{
    int line_length = strlen(line);

    /* If the log doesn't fit, error out. */
    if (client_log_buffer_index + line_length > sizeof(client_log_buffer) - 1) {
        TEST_info("Client log too full");
        error_writing_log = 1;
        return;
    }

    strcat(client_log_buffer, line);
    client_log_buffer_index += line_length;
    client_log_buffer[client_log_buffer_index++] = '\n';
}

static void server_keylog_callback(const SSL *ssl, const char *line)
{
    int line_length = strlen(line);

    /* If the log doesn't fit, error out. */
    if (server_log_buffer_index + line_length > sizeof(server_log_buffer) - 1) {
        TEST_info("Server log too full");
        error_writing_log = 1;
        return;
    }

    strcat(server_log_buffer, line);
    server_log_buffer_index += line_length;
    server_log_buffer[server_log_buffer_index++] = '\n';
}

static int compare_hex_encoded_buffer(const char *hex_encoded,
                                      size_t hex_length,
                                      const uint8_t *raw,
                                      size_t raw_length)
{
    size_t i, j;
    char hexed[3];

    if (!TEST_size_t_eq(raw_length * 2, hex_length))
        return 1;

    for (i = j = 0; i < raw_length && j + 1 < hex_length; i++, j += 2) {
        sprintf(hexed, "%02x", raw[i]);
        if (!TEST_int_eq(hexed[0], hex_encoded[j])
                || !TEST_int_eq(hexed[1], hex_encoded[j + 1]))
            return 1;
    }

    return 0;
}

static int test_keylog_output(char *buffer, const SSL *ssl,
                              const SSL_SESSION *session,
                              struct sslapitest_log_counts *expected)
{
    char *token = NULL;
    unsigned char actual_client_random[SSL3_RANDOM_SIZE] = {0};
    size_t client_random_size = SSL3_RANDOM_SIZE;
    unsigned char actual_master_key[SSL_MAX_MASTER_KEY_LENGTH] = {0};
    size_t master_key_size = SSL_MAX_MASTER_KEY_LENGTH;
    unsigned int rsa_key_exchange_count = 0;
    unsigned int master_secret_count = 0;
    unsigned int client_handshake_secret_count = 0;
    unsigned int server_handshake_secret_count = 0;
    unsigned int client_application_secret_count = 0;
    unsigned int server_application_secret_count = 0;

    for (token = strtok(buffer, " \n"); token != NULL;
         token = strtok(NULL, " \n")) {
        if (strcmp(token, "RSA") == 0) {
            /*
             * Premaster secret. Tokens should be: 16 ASCII bytes of
             * hex-encoded encrypted secret, then the hex-encoded pre-master
             * secret.
             */
            if (!TEST_ptr(token = strtok(NULL, " \n")))
                return 0;
            if (!TEST_size_t_eq(strlen(token), 16))
                return 0;
            if (!TEST_ptr(token = strtok(NULL, " \n")))
                return 0;
            /*
             * We can't sensibly check the log because the premaster secret is
             * transient, and OpenSSL doesn't keep hold of it once the master
             * secret is generated.
             */
            rsa_key_exchange_count++;
        } else if (strcmp(token, "CLIENT_RANDOM") == 0) {
            /*
             * Master secret. Tokens should be: 64 ASCII bytes of hex-encoded
             * client random, then the hex-encoded master secret.
             */
            client_random_size = SSL_get_client_random(ssl,
                                                       actual_client_random,
                                                       SSL3_RANDOM_SIZE);
            if (!TEST_size_t_eq(client_random_size, SSL3_RANDOM_SIZE))
                return 0;

            if (!TEST_ptr(token = strtok(NULL, " \n")))
                return 0;
            if (!TEST_size_t_eq(strlen(token), 64))
                return 0;
            if (!TEST_false(compare_hex_encoded_buffer(token, 64,
                                                       actual_client_random,
                                                       client_random_size)))
                return 0;

            if (!TEST_ptr(token = strtok(NULL, " \n")))
                return 0;
            master_key_size = SSL_SESSION_get_master_key(session,
                                                         actual_master_key,
                                                         master_key_size);
            if (!TEST_size_t_ne(master_key_size, 0))
                return 0;
            if (!TEST_false(compare_hex_encoded_buffer(token, strlen(token),
                                                       actual_master_key,
                                                       master_key_size)))
                return 0;
            master_secret_count++;
        } else if (strcmp(token, "CLIENT_HANDSHAKE_TRAFFIC_SECRET") == 0
                    || strcmp(token, "SERVER_HANDSHAKE_TRAFFIC_SECRET") == 0
                    || strcmp(token, "CLIENT_TRAFFIC_SECRET_0") == 0
                    || strcmp(token, "SERVER_TRAFFIC_SECRET_0") == 0) {
            /*
             * TLSv1.3 secret. Tokens should be: 64 ASCII bytes of hex-encoded
             * client random, and then the hex-encoded secret. In this case,
             * we treat all of these secrets identically and then just
             * distinguish between them when counting what we saw.
             */
            if (strcmp(token, "CLIENT_HANDSHAKE_TRAFFIC_SECRET") == 0)
                client_handshake_secret_count++;
            else if (strcmp(token, "SERVER_HANDSHAKE_TRAFFIC_SECRET") == 0)
                server_handshake_secret_count++;
            else if (strcmp(token, "CLIENT_TRAFFIC_SECRET_0") == 0)
                client_application_secret_count++;
            else if (strcmp(token, "SERVER_TRAFFIC_SECRET_0") == 0)
                server_application_secret_count++;

            client_random_size = SSL_get_client_random(ssl,
                                                       actual_client_random,
                                                       SSL3_RANDOM_SIZE);
            if (!TEST_size_t_eq(client_random_size, SSL3_RANDOM_SIZE))
                return 0;

            if (!TEST_ptr(token = strtok(NULL, " \n")))
                return 0;
            if (!TEST_size_t_eq(strlen(token), 64))
                return 0;
            if (!TEST_false(compare_hex_encoded_buffer(token, 64,
                                                       actual_client_random,
                                                       client_random_size)))
                return 0;

            if (!TEST_ptr(token = strtok(NULL, " \n")))
                return 0;

            /*
             * TODO(TLS1.3): test that application traffic secrets are what
             * we expect */
        } else {
            TEST_info("Unexpected token %s\n", token);
            return 0;
        }
    }

    /* Got what we expected? */
    if (!TEST_size_t_eq(rsa_key_exchange_count,
                        expected->rsa_key_exchange_count)
            || !TEST_size_t_eq(master_secret_count,
                               expected->master_secret_count)
            || !TEST_size_t_eq(client_handshake_secret_count,
                               expected->client_handshake_secret_count)
            || !TEST_size_t_eq(server_handshake_secret_count,
                               expected->server_handshake_secret_count)
            || !TEST_size_t_eq(client_application_secret_count,
                               expected->client_application_secret_count)
            || !TEST_size_t_eq(server_application_secret_count,
                               expected->server_application_secret_count))
        return 0;
    return 1;
}

#if !defined(OPENSSL_NO_TLS1_2) || defined(OPENSSL_NO_TLS1_3)
static int test_keylog(void)
{
    SSL_CTX *cctx = NULL, *sctx = NULL;
    SSL *clientssl = NULL, *serverssl = NULL;
    int testresult = 0;
    struct sslapitest_log_counts expected = {0};

    /* Clean up logging space */
    memset(client_log_buffer, 0, sizeof(client_log_buffer));
    memset(server_log_buffer, 0, sizeof(server_log_buffer));
    client_log_buffer_index = 0;
    server_log_buffer_index = 0;
    error_writing_log = 0;

    if (!TEST_true(create_ssl_ctx_pair(TLS_server_method(),
                                       TLS_client_method(),
                                       TLS1_VERSION, TLS_MAX_VERSION,
                                       &sctx, &cctx, cert, privkey)))
        return 0;

    /* We cannot log the master secret for TLSv1.3, so we should forbid it. */
    SSL_CTX_set_options(cctx, SSL_OP_NO_TLSv1_3);
    SSL_CTX_set_options(sctx, SSL_OP_NO_TLSv1_3);

    /* We also want to ensure that we use RSA-based key exchange. */
    if (!TEST_true(SSL_CTX_set_cipher_list(cctx, "RSA")))
        goto end;

    if (!TEST_true(SSL_CTX_get_keylog_callback(cctx) == NULL)
            || !TEST_true(SSL_CTX_get_keylog_callback(sctx) == NULL))
        goto end;
    SSL_CTX_set_keylog_callback(cctx, client_keylog_callback);
    if (!TEST_true(SSL_CTX_get_keylog_callback(cctx)
                   == client_keylog_callback))
        goto end;
    SSL_CTX_set_keylog_callback(sctx, server_keylog_callback);
    if (!TEST_true(SSL_CTX_get_keylog_callback(sctx)
                   == server_keylog_callback))
        goto end;

    /* Now do a handshake and check that the logs have been written to. */
    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl,
                                      &clientssl, NULL, NULL))
            || !TEST_true(create_ssl_connection(serverssl, clientssl,
                                                SSL_ERROR_NONE))
            || !TEST_false(error_writing_log)
            || !TEST_int_gt(client_log_buffer_index, 0)
            || !TEST_int_gt(server_log_buffer_index, 0))
        goto end;

    /*
     * Now we want to test that our output data was vaguely sensible. We
     * do that by using strtok and confirming that we have more or less the
     * data we expect. For both client and server, we expect to see one master
     * secret. The client should also see a RSA key exchange.
     */
    expected.rsa_key_exchange_count = 1;
    expected.master_secret_count = 1;
    if (!TEST_true(test_keylog_output(client_log_buffer, clientssl,
                                      SSL_get_session(clientssl), &expected)))
        goto end;

    expected.rsa_key_exchange_count = 0;
    if (!TEST_true(test_keylog_output(server_log_buffer, serverssl,
                                      SSL_get_session(serverssl), &expected)))
        goto end;

    testresult = 1;

end:
    SSL_free(serverssl);
    SSL_free(clientssl);
    SSL_CTX_free(sctx);
    SSL_CTX_free(cctx);

    return testresult;
}
#endif

#ifndef OPENSSL_NO_TLS1_3
static int test_keylog_no_master_key(void)
{
    SSL_CTX *cctx = NULL, *sctx = NULL;
    SSL *clientssl = NULL, *serverssl = NULL;
    int testresult = 0;
    struct sslapitest_log_counts expected = {0};

    /* Clean up logging space */
    memset(client_log_buffer, 0, sizeof(client_log_buffer));
    memset(server_log_buffer, 0, sizeof(server_log_buffer));
    client_log_buffer_index = 0;
    server_log_buffer_index = 0;
    error_writing_log = 0;

    if (!TEST_true(create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(),
                                       TLS1_VERSION, TLS_MAX_VERSION,
                                       &sctx, &cctx, cert, privkey)))
        return 0;

    if (!TEST_true(SSL_CTX_get_keylog_callback(cctx) == NULL)
            || !TEST_true(SSL_CTX_get_keylog_callback(sctx) == NULL))
        goto end;

    SSL_CTX_set_keylog_callback(cctx, client_keylog_callback);
    if (!TEST_true(SSL_CTX_get_keylog_callback(cctx)
                   == client_keylog_callback))
        goto end;

    SSL_CTX_set_keylog_callback(sctx, server_keylog_callback);
    if (!TEST_true(SSL_CTX_get_keylog_callback(sctx)
                   == server_keylog_callback))
        goto end;

    /* Now do a handshake and check that the logs have been written to. */
    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl,
                                      &clientssl, NULL, NULL))
            || !TEST_true(create_ssl_connection(serverssl, clientssl,
                                                SSL_ERROR_NONE))
            || !TEST_false(error_writing_log))
        goto end;

    /*
     * Now we want to test that our output data was vaguely sensible. For this
     * test, we expect no CLIENT_RANDOM entry because it doesn't make sense for
     * TLSv1.3, but we do expect both client and server to emit keys.
     */
    expected.client_handshake_secret_count = 1;
    expected.server_handshake_secret_count = 1;
    expected.client_application_secret_count = 1;
    expected.server_application_secret_count = 1;
    if (!TEST_true(test_keylog_output(client_log_buffer, clientssl,
                                      SSL_get_session(clientssl), &expected))
            || !TEST_true(test_keylog_output(server_log_buffer, serverssl,
                                             SSL_get_session(serverssl),
                                             &expected)))
        goto end;

    testresult = 1;

end:
    SSL_free(serverssl);
    SSL_free(clientssl);
    SSL_CTX_free(sctx);
    SSL_CTX_free(cctx);

    return testresult;
}
#endif

#ifndef OPENSSL_NO_TLS1_2
static int full_client_hello_callback(SSL *s, int *al, void *arg)
{
    int *ctr = arg;
    const unsigned char *p;
    int *exts;
    /* We only configure two ciphers, but the SCSV is added automatically. */
#ifdef OPENSSL_NO_EC
    const unsigned char expected_ciphers[] = {0x00, 0x9d, 0x00, 0xff};
#else
    const unsigned char expected_ciphers[] = {0x00, 0x9d, 0xc0,
                                              0x2c, 0x00, 0xff};
#endif
    const int expected_extensions[] = {
#ifndef OPENSSL_NO_EC
                                       11, 10,
#endif
                                       35, 22, 23, 13};
    size_t len;

    /* Make sure we can defer processing and get called back. */
    if ((*ctr)++ == 0)
        return SSL_CLIENT_HELLO_RETRY;

    len = SSL_client_hello_get0_ciphers(s, &p);
    if (!TEST_mem_eq(p, len, expected_ciphers, sizeof(expected_ciphers))
            || !TEST_size_t_eq(
                       SSL_client_hello_get0_compression_methods(s, &p), 1)
            || !TEST_int_eq(*p, 0))
        return SSL_CLIENT_HELLO_ERROR;
    if (!SSL_client_hello_get1_extensions_present(s, &exts, &len))
        return SSL_CLIENT_HELLO_ERROR;
    if (len != OSSL_NELEM(expected_extensions) ||
        memcmp(exts, expected_extensions, len * sizeof(*exts)) != 0) {
        printf("ClientHello callback expected extensions mismatch\n");
        OPENSSL_free(exts);
        return SSL_CLIENT_HELLO_ERROR;
    }
    OPENSSL_free(exts);
    return SSL_CLIENT_HELLO_SUCCESS;
}

static int test_client_hello_cb(void)
{
    SSL_CTX *cctx = NULL, *sctx = NULL;
    SSL *clientssl = NULL, *serverssl = NULL;
    int testctr = 0, testresult = 0;

    if (!TEST_true(create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(),
                                       TLS1_VERSION, TLS_MAX_VERSION,
                                       &sctx, &cctx, cert, privkey)))
        goto end;
    SSL_CTX_set_client_hello_cb(sctx, full_client_hello_callback, &testctr);

    /* The gimpy cipher list we configure can't do TLS 1.3. */
    SSL_CTX_set_max_proto_version(cctx, TLS1_2_VERSION);

    if (!TEST_true(SSL_CTX_set_cipher_list(cctx,
                        "AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384"))
            || !TEST_true(create_ssl_objects(sctx, cctx, &serverssl,
                                             &clientssl, NULL, NULL))
            || !TEST_false(create_ssl_connection(serverssl, clientssl,
                        SSL_ERROR_WANT_CLIENT_HELLO_CB))
                /*
                 * Passing a -1 literal is a hack since
                 * the real value was lost.
                 * */
            || !TEST_int_eq(SSL_get_error(serverssl, -1),
                            SSL_ERROR_WANT_CLIENT_HELLO_CB)
            || !TEST_true(create_ssl_connection(serverssl, clientssl,
                                                SSL_ERROR_NONE)))
        goto end;

    testresult = 1;

end:
    SSL_free(serverssl);
    SSL_free(clientssl);
    SSL_CTX_free(sctx);
    SSL_CTX_free(cctx);

    return testresult;
}
#endif

static int execute_test_large_message(const SSL_METHOD *smeth,
                                      const SSL_METHOD *cmeth,
                                      int min_version, int max_version,
                                      int read_ahead)
{
    SSL_CTX *cctx = NULL, *sctx = NULL;
    SSL *clientssl = NULL, *serverssl = NULL;
    int testresult = 0;
    int i;
    BIO *certbio = NULL;
    X509 *chaincert = NULL;
    int certlen;

    if (!TEST_ptr(certbio = BIO_new_file(cert, "r")))
        goto end;
    chaincert = PEM_read_bio_X509(certbio, NULL, NULL, NULL);
    BIO_free(certbio);
    certbio = NULL;
    if (!TEST_ptr(chaincert))
        goto end;

    if (!TEST_true(create_ssl_ctx_pair(smeth, cmeth, min_version, max_version,
                                       &sctx, &cctx, cert, privkey)))
        goto end;

    if (read_ahead) {
        /*
         * Test that read_ahead works correctly when dealing with large
         * records
         */
        SSL_CTX_set_read_ahead(cctx, 1);
    }

    /*
     * We assume the supplied certificate is big enough so that if we add
     * NUM_EXTRA_CERTS it will make the overall message large enough. The
     * default buffer size is requested to be 16k, but due to the way BUF_MEM
     * works, it ends up allocating a little over 21k (16 * 4/3). So, in this
     * test we need to have a message larger than that.
     */
    certlen = i2d_X509(chaincert, NULL);
    OPENSSL_assert(certlen * NUM_EXTRA_CERTS >
                   (SSL3_RT_MAX_PLAIN_LENGTH * 4) / 3);
    for (i = 0; i < NUM_EXTRA_CERTS; i++) {
        if (!X509_up_ref(chaincert))
            goto end;
        if (!SSL_CTX_add_extra_chain_cert(sctx, chaincert)) {
            X509_free(chaincert);
            goto end;
        }
    }

    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl, &clientssl,
                                      NULL, NULL))
            || !TEST_true(create_ssl_connection(serverssl, clientssl,
                                                SSL_ERROR_NONE)))
        goto end;

    /*
     * Calling SSL_clear() first is not required but this tests that SSL_clear()
     * doesn't leak (when using enable-crypto-mdebug).
     */
    if (!TEST_true(SSL_clear(serverssl)))
        goto end;

    testresult = 1;
 end:
    X509_free(chaincert);
    SSL_free(serverssl);
    SSL_free(clientssl);
    SSL_CTX_free(sctx);
    SSL_CTX_free(cctx);

    return testresult;
}

static int test_large_message_tls(void)
{
    return execute_test_large_message(TLS_server_method(), TLS_client_method(),
                                      TLS1_VERSION, TLS_MAX_VERSION,
                                      0);
}

static int test_large_message_tls_read_ahead(void)
{
    return execute_test_large_message(TLS_server_method(), TLS_client_method(),
                                      TLS1_VERSION, TLS_MAX_VERSION,
                                      1);
}

#ifndef OPENSSL_NO_DTLS
static int test_large_message_dtls(void)
{
    /*
     * read_ahead is not relevant to DTLS because DTLS always acts as if
     * read_ahead is set.
     */
    return execute_test_large_message(DTLS_server_method(),
                                      DTLS_client_method(),
                                      DTLS1_VERSION, DTLS_MAX_VERSION,
                                      0);
}
#endif

#ifndef OPENSSL_NO_OCSP
static int ocsp_server_cb(SSL *s, void *arg)
{
    int *argi = (int *)arg;
    unsigned char *copy = NULL;
    STACK_OF(OCSP_RESPID) *ids = NULL;
    OCSP_RESPID *id = NULL;

    if (*argi == 2) {
        /* In this test we are expecting exactly 1 OCSP_RESPID */
        SSL_get_tlsext_status_ids(s, &ids);
        if (ids == NULL || sk_OCSP_RESPID_num(ids) != 1)
            return SSL_TLSEXT_ERR_ALERT_FATAL;

        id = sk_OCSP_RESPID_value(ids, 0);
        if (id == NULL || !OCSP_RESPID_match(id, ocspcert))
            return SSL_TLSEXT_ERR_ALERT_FATAL;
    } else if (*argi != 1) {
        return SSL_TLSEXT_ERR_ALERT_FATAL;
    }

    if (!TEST_ptr(copy = OPENSSL_memdup(orespder, sizeof(orespder))))
        return SSL_TLSEXT_ERR_ALERT_FATAL;

    SSL_set_tlsext_status_ocsp_resp(s, copy, sizeof(orespder));
    ocsp_server_called = 1;
    return SSL_TLSEXT_ERR_OK;
}

static int ocsp_client_cb(SSL *s, void *arg)
{
    int *argi = (int *)arg;
    const unsigned char *respderin;
    size_t len;

    if (*argi != 1 && *argi != 2)
        return 0;

    len = SSL_get_tlsext_status_ocsp_resp(s, &respderin);
    if (!TEST_mem_eq(orespder, len, respderin, len))
        return 0;

    ocsp_client_called = 1;
    return 1;
}

static int test_tlsext_status_type(void)
{
    SSL_CTX *cctx = NULL, *sctx = NULL;
    SSL *clientssl = NULL, *serverssl = NULL;
    int testresult = 0;
    STACK_OF(OCSP_RESPID) *ids = NULL;
    OCSP_RESPID *id = NULL;
    BIO *certbio = NULL;

    if (!create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(),
                             TLS1_VERSION, TLS_MAX_VERSION,
                             &sctx, &cctx, cert, privkey))
        return 0;

    if (SSL_CTX_get_tlsext_status_type(cctx) != -1)
        goto end;

    /* First just do various checks getting and setting tlsext_status_type */

    clientssl = SSL_new(cctx);
    if (!TEST_int_eq(SSL_get_tlsext_status_type(clientssl), -1)
            || !TEST_true(SSL_set_tlsext_status_type(clientssl,
                                                      TLSEXT_STATUSTYPE_ocsp))
            || !TEST_int_eq(SSL_get_tlsext_status_type(clientssl),
                            TLSEXT_STATUSTYPE_ocsp))
        goto end;

    SSL_free(clientssl);
    clientssl = NULL;

    if (!SSL_CTX_set_tlsext_status_type(cctx, TLSEXT_STATUSTYPE_ocsp)
     || SSL_CTX_get_tlsext_status_type(cctx) != TLSEXT_STATUSTYPE_ocsp)
        goto end;

    clientssl = SSL_new(cctx);
    if (SSL_get_tlsext_status_type(clientssl) != TLSEXT_STATUSTYPE_ocsp)
        goto end;
    SSL_free(clientssl);
    clientssl = NULL;

    /*
     * Now actually do a handshake and check OCSP information is exchanged and
     * the callbacks get called
     */
    SSL_CTX_set_tlsext_status_cb(cctx, ocsp_client_cb);
    SSL_CTX_set_tlsext_status_arg(cctx, &cdummyarg);
    SSL_CTX_set_tlsext_status_cb(sctx, ocsp_server_cb);
    SSL_CTX_set_tlsext_status_arg(sctx, &cdummyarg);
    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl,
                                      &clientssl, NULL, NULL))
            || !TEST_true(create_ssl_connection(serverssl, clientssl,
                                                SSL_ERROR_NONE))
            || !TEST_true(ocsp_client_called)
            || !TEST_true(ocsp_server_called))
        goto end;
    SSL_free(serverssl);
    SSL_free(clientssl);
    serverssl = NULL;
    clientssl = NULL;

    /* Try again but this time force the server side callback to fail */
    ocsp_client_called = 0;
    ocsp_server_called = 0;
    cdummyarg = 0;
    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl,
                                      &clientssl, NULL, NULL))
                /* This should fail because the callback will fail */
            || !TEST_false(create_ssl_connection(serverssl, clientssl,
                                                 SSL_ERROR_NONE))
            || !TEST_false(ocsp_client_called)
            || !TEST_false(ocsp_server_called))
        goto end;
    SSL_free(serverssl);
    SSL_free(clientssl);
    serverssl = NULL;
    clientssl = NULL;

    /*
     * This time we'll get the client to send an OCSP_RESPID that it will
     * accept.
     */
    ocsp_client_called = 0;
    ocsp_server_called = 0;
    cdummyarg = 2;
    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl,
                                      &clientssl, NULL, NULL)))
        goto end;

    /*
     * We'll just use any old cert for this test - it doesn't have to be an OCSP
     * specific one. We'll use the server cert.
     */
    if (!TEST_ptr(certbio = BIO_new_file(cert, "r"))
            || !TEST_ptr(id = OCSP_RESPID_new())
            || !TEST_ptr(ids = sk_OCSP_RESPID_new_null())
            || !TEST_ptr(ocspcert = PEM_read_bio_X509(certbio,
                                                      NULL, NULL, NULL))
            || !TEST_true(OCSP_RESPID_set_by_key(id, ocspcert))
            || !TEST_true(sk_OCSP_RESPID_push(ids, id)))
        goto end;
    id = NULL;
    SSL_set_tlsext_status_ids(clientssl, ids);
    /* Control has been transferred */
    ids = NULL;

    BIO_free(certbio);
    certbio = NULL;

    if (!TEST_true(create_ssl_connection(serverssl, clientssl,
                                         SSL_ERROR_NONE))
            || !TEST_true(ocsp_client_called)
            || !TEST_true(ocsp_server_called))
        goto end;

    testresult = 1;

 end:
    SSL_free(serverssl);
    SSL_free(clientssl);
    SSL_CTX_free(sctx);
    SSL_CTX_free(cctx);
    sk_OCSP_RESPID_pop_free(ids, OCSP_RESPID_free);
    OCSP_RESPID_free(id);
    BIO_free(certbio);
    X509_free(ocspcert);
    ocspcert = NULL;

    return testresult;
}
#endif

#if !defined(OPENSSL_NO_TLS1_3) || !defined(OPENSSL_NO_TLS1_2)
static int new_called, remove_called, get_called;

static int new_session_cb(SSL *ssl, SSL_SESSION *sess)
{
    new_called++;
    /*
     * sess has been up-refed for us, but we don't actually need it so free it
     * immediately.
     */
    SSL_SESSION_free(sess);
    return 1;
}

static void remove_session_cb(SSL_CTX *ctx, SSL_SESSION *sess)
{
    remove_called++;
}

static SSL_SESSION *get_sess_val = NULL;

static SSL_SESSION *get_session_cb(SSL *ssl, const unsigned char *id, int len,
                                   int *copy)
{
    get_called++;
    *copy = 1;
    return get_sess_val;
}

static int execute_test_session(int maxprot, int use_int_cache,
                                int use_ext_cache)
{
    SSL_CTX *sctx = NULL, *cctx = NULL;
    SSL *serverssl1 = NULL, *clientssl1 = NULL;
    SSL *serverssl2 = NULL, *clientssl2 = NULL;
# ifndef OPENSSL_NO_TLS1_1
    SSL *serverssl3 = NULL, *clientssl3 = NULL;
# endif
    SSL_SESSION *sess1 = NULL, *sess2 = NULL;
    int testresult = 0;

    new_called = remove_called = 0;

    if (!TEST_true(create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(),
                                       TLS1_VERSION, TLS_MAX_VERSION,
                                       &sctx, &cctx, cert, privkey)))
        return 0;

    /*
     * Only allow the max protocol version so we can force a connection failure
     * later
     */
    SSL_CTX_set_min_proto_version(cctx, maxprot);
    SSL_CTX_set_max_proto_version(cctx, maxprot);

    /* Set up session cache */
    if (use_ext_cache) {
        SSL_CTX_sess_set_new_cb(cctx, new_session_cb);
        SSL_CTX_sess_set_remove_cb(cctx, remove_session_cb);
    }
    if (use_int_cache) {
        /* Also covers instance where both are set */
        SSL_CTX_set_session_cache_mode(cctx, SSL_SESS_CACHE_CLIENT);
    } else {
        SSL_CTX_set_session_cache_mode(cctx,
                                       SSL_SESS_CACHE_CLIENT
                                       | SSL_SESS_CACHE_NO_INTERNAL_STORE);
    }

    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl1, &clientssl1,
                                      NULL, NULL))
            || !TEST_true(create_ssl_connection(serverssl1, clientssl1,
                                                SSL_ERROR_NONE))
            || !TEST_ptr(sess1 = SSL_get1_session(clientssl1)))
        goto end;

    /* Should fail because it should already be in the cache */
    if (use_int_cache && !TEST_false(SSL_CTX_add_session(cctx, sess1)))
        goto end;
    if (use_ext_cache
            && (!TEST_int_eq(new_called, 1) || !TEST_int_eq(remove_called, 0)))
        goto end;

    new_called = remove_called = 0;
    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl2,
                                      &clientssl2, NULL, NULL))
            || !TEST_true(SSL_set_session(clientssl2, sess1))
            || !TEST_true(create_ssl_connection(serverssl2, clientssl2,
                                                SSL_ERROR_NONE))
            || !TEST_true(SSL_session_reused(clientssl2)))
        goto end;

    if (maxprot == TLS1_3_VERSION) {
        /*
         * In TLSv1.3 we should have created a new session even though we have
         * resumed. The original session should also have been removed.
         */
        if (use_ext_cache
                && (!TEST_int_eq(new_called, 1)
                    || !TEST_int_eq(remove_called, 1)))
            goto end;
    } else {
        /*
         * In TLSv1.2 we expect to have resumed so no sessions added or
         * removed.
         */
        if (use_ext_cache
                && (!TEST_int_eq(new_called, 0)
                    || !TEST_int_eq(remove_called, 0)))
            goto end;
    }

    SSL_SESSION_free(sess1);
    if (!TEST_ptr(sess1 = SSL_get1_session(clientssl2)))
        goto end;
    shutdown_ssl_connection(serverssl2, clientssl2);
    serverssl2 = clientssl2 = NULL;

    new_called = remove_called = 0;
    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl2,
                                      &clientssl2, NULL, NULL))
            || !TEST_true(create_ssl_connection(serverssl2, clientssl2,
                                                SSL_ERROR_NONE)))
        goto end;

    if (!TEST_ptr(sess2 = SSL_get1_session(clientssl2)))
        goto end;

    if (use_ext_cache
            && (!TEST_int_eq(new_called, 1) || !TEST_int_eq(remove_called, 0)))
        goto end;

    new_called = remove_called = 0;
    /*
     * This should clear sess2 from the cache because it is a "bad" session.
     * See SSL_set_session() documentation.
     */
    if (!TEST_true(SSL_set_session(clientssl2, sess1)))
        goto end;
    if (use_ext_cache
            && (!TEST_int_eq(new_called, 0) || !TEST_int_eq(remove_called, 1)))
        goto end;
    if (!TEST_ptr_eq(SSL_get_session(clientssl2), sess1))
        goto end;

    if (use_int_cache) {
        /* Should succeeded because it should not already be in the cache */
        if (!TEST_true(SSL_CTX_add_session(cctx, sess2))
                || !TEST_true(SSL_CTX_remove_session(cctx, sess2)))
            goto end;
    }

    new_called = remove_called = 0;
    /* This shouldn't be in the cache so should fail */
    if (!TEST_false(SSL_CTX_remove_session(cctx, sess2)))
        goto end;

    if (use_ext_cache
            && (!TEST_int_eq(new_called, 0) || !TEST_int_eq(remove_called, 1)))
        goto end;

# if !defined(OPENSSL_NO_TLS1_1)
    new_called = remove_called = 0;
    /* Force a connection failure */
    SSL_CTX_set_max_proto_version(sctx, TLS1_1_VERSION);
    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl3,
                                      &clientssl3, NULL, NULL))
            || !TEST_true(SSL_set_session(clientssl3, sess1))
            /* This should fail because of the mismatched protocol versions */
            || !TEST_false(create_ssl_connection(serverssl3, clientssl3,
                                                 SSL_ERROR_NONE)))
        goto end;

    /* We should have automatically removed the session from the cache */
    if (use_ext_cache
            && (!TEST_int_eq(new_called, 0) || !TEST_int_eq(remove_called, 1)))
        goto end;

    /* Should succeed because it should not already be in the cache */
    if (use_int_cache && !TEST_true(SSL_CTX_add_session(cctx, sess2)))
        goto end;
# endif

    /* Now do some tests for server side caching */
    if (use_ext_cache) {
        SSL_CTX_sess_set_new_cb(cctx, NULL);
        SSL_CTX_sess_set_remove_cb(cctx, NULL);
        SSL_CTX_sess_set_new_cb(sctx, new_session_cb);
        SSL_CTX_sess_set_remove_cb(sctx, remove_session_cb);
        SSL_CTX_sess_set_get_cb(sctx, get_session_cb);
        get_sess_val = NULL;
    }

    SSL_CTX_set_session_cache_mode(cctx, 0);
    /* Internal caching is the default on the server side */
    if (!use_int_cache)
        SSL_CTX_set_session_cache_mode(sctx,
                                       SSL_SESS_CACHE_SERVER
                                       | SSL_SESS_CACHE_NO_INTERNAL_STORE);

    SSL_free(serverssl1);
    SSL_free(clientssl1);
    serverssl1 = clientssl1 = NULL;
    SSL_free(serverssl2);
    SSL_free(clientssl2);
    serverssl2 = clientssl2 = NULL;
    SSL_SESSION_free(sess1);
    sess1 = NULL;
    SSL_SESSION_free(sess2);
    sess2 = NULL;

    SSL_CTX_set_max_proto_version(sctx, maxprot);
    SSL_CTX_set_options(sctx, SSL_OP_NO_TICKET);
    new_called = remove_called = get_called = 0;
    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl1, &clientssl1,
                                      NULL, NULL))
            || !TEST_true(create_ssl_connection(serverssl1, clientssl1,
                                                SSL_ERROR_NONE))
            || !TEST_ptr(sess1 = SSL_get1_session(clientssl1))
            || !TEST_ptr(sess2 = SSL_get1_session(serverssl1)))
        goto end;

    /* Should fail because it should already be in the cache */