sslapitest.c

/*
 * 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 <string.h>

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

#include "ssltestlib.h"
#include "testutil.h"
#include "test_main_custom.h"
#include "e_os.h"

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

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

/*
 * 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 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) > LOG_BUFFER_SIZE) {
        printf("No room in client log\n");
        error_writing_log = 1;
        return;
    }

    strcat(client_log_buffer, line);
    client_log_buffer_index += line_length;
    client_log_buffer[client_log_buffer_index] = '\n';
    client_log_buffer_index += 1;

    return;
}

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) > LOG_BUFFER_SIZE) {
        printf("No room in server log\n");
        error_writing_log = 1;
        return;
    }

    strcat(server_log_buffer, line);
    server_log_buffer_index += line_length;
    server_log_buffer[server_log_buffer_index] = '\n';
    server_log_buffer_index += 1;

    return;
}

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;
    size_t j;

    /* One byte too big, just to be safe. */
    char hexed[3] = {0};

    if ((raw_length * 2) != hex_length) {
        printf("Inconsistent hex encoded lengths.\n");
        return 1;
    }

    for (i = j = 0; (i < raw_length) && ((j + 1) < hex_length); i++) {
        sprintf(hexed, "%02x", raw[i]);
        if ((hexed[0] != hex_encoded[j]) || (hexed[1] != hex_encoded[j + 1])) {
            printf("Hex output does not match.\n");
            return 1;
        }
        j += 2;
    }

    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;

    token = strtok(buffer, " \n");
    while (token) {
        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.
             */
            token = strtok(NULL, " \n");
            if (!token) {
                printf("Unexpectedly short premaster secret log.\n");
                return 0;
            }
            if (strlen(token) != 16) {
                printf("Bad value for encrypted secret: %s\n", token);
                return 0;
            }
            token = strtok(NULL, " \n");
            if (!token) {
                printf("Unexpectedly short premaster secret log.\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 (client_random_size != SSL3_RANDOM_SIZE) {
                printf("Unexpected short client random.\n");
                return 0;
            }

            token = strtok(NULL, " \n");
            if (!token) {
                printf("Unexpected short master secret log.\n");
                return 0;
            }
            if (strlen(token) != 64) {
                printf("Bad value for client random: %s\n", token);
                return 0;
            }
            if (compare_hex_encoded_buffer(token, 64, actual_client_random,
                                           client_random_size)) {
                printf("Bad value for client random: %s\n", token);
                return 0;
            }

            token = strtok(NULL, " \n");
            if (!token) {
                printf("Unexpectedly short master secret log.\n");
                return 0;
            }

            master_key_size = SSL_SESSION_get_master_key(session,
                                                         actual_master_key,
                                                         master_key_size);
            if (!master_key_size) {
                printf("Error getting master key to compare.\n");
                return 0;
            }
            if (compare_hex_encoded_buffer(token, strlen(token),
                                           actual_master_key,
                                           master_key_size)) {
                printf("Bad value for master key: %s\n", token);
                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 (client_random_size != SSL3_RANDOM_SIZE) {
                printf("Unexpected short client random.\n");
                return 0;
            }

            token = strtok(NULL, " \n");
            if (!token) {
                printf("Unexpected short client handshake secret log.\n");
                return 0;
            }
            if (strlen(token) != 64) {
                printf("Bad value for client random: %s\n", token);
                return 0;
            }
            if (compare_hex_encoded_buffer(token, 64, actual_client_random,
                                           client_random_size)) {
                printf("Bad value for client random: %s\n", token);
                return 0;
            }

            token = strtok(NULL, " \n");
            if (!token) {
                printf("Unexpectedly short master secret log.\n");
                return 0;
            }

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

        token = strtok(NULL, " \n");
    }

    /* Return whether we got what we expected. */
    return ((rsa_key_exchange_count == expected->rsa_key_exchange_count) &&
            (master_secret_count == expected->master_secret_count) &&
            (client_handshake_secret_count == expected->client_handshake_secret_count) &&
            (server_handshake_secret_count == expected->server_handshake_secret_count) &&
            (client_application_secret_count == expected->client_application_secret_count) &&
            (server_application_secret_count == expected->server_application_secret_count));
}

static int test_keylog(void) {
    SSL_CTX *cctx = NULL, *sctx = NULL;
    SSL *clientssl = NULL, *serverssl = NULL;
    int testresult = 0;
    int rc;
    struct sslapitest_log_counts expected = {0};

    /* Clean up logging space */
    memset(client_log_buffer, 0, LOG_BUFFER_SIZE + 1);
    memset(server_log_buffer, 0, LOG_BUFFER_SIZE + 1);
    client_log_buffer_index = 0;
    server_log_buffer_index = 0;
    error_writing_log = 0;

    if (!create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(), &sctx,
                             &cctx, cert, privkey)) {
        printf("Unable to create SSL_CTX pair\n");
        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. */
    rc = SSL_CTX_set_cipher_list(cctx, "RSA");
    if (rc == 0) {
        printf("Unable to restrict to RSA key exchange.\n");
        goto end;
    }

    if (SSL_CTX_get_keylog_callback(cctx)) {
        printf("Unexpected initial value for client "
               "SSL_CTX_get_keylog_callback()\n");
        goto end;
    }
    if (SSL_CTX_get_keylog_callback(sctx)) {
        printf("Unexpected initial value for server "
               "SSL_CTX_get_keylog_callback()\n");
        goto end;
    }

    SSL_CTX_set_keylog_callback(cctx, client_keylog_callback);
    SSL_CTX_set_keylog_callback(sctx, server_keylog_callback);

    if (SSL_CTX_get_keylog_callback(cctx) != client_keylog_callback) {
        printf("Unexpected set value for client "
               "SSL_CTX_get_keylog_callback()\n");
    }

    if (SSL_CTX_get_keylog_callback(sctx) != server_keylog_callback) {
        printf("Unexpected set value for server "
               "SSL_CTX_get_keylog_callback()\n");
    }

    /* Now do a handshake and check that the logs have been written to. */
    if (!create_ssl_objects(sctx, cctx, &serverssl, &clientssl, NULL, NULL)) {
        printf("Unable to create SSL objects\n");
        goto end;
    }

    if (!create_ssl_connection(serverssl, clientssl, SSL_ERROR_NONE)) {
        printf("Unable to create SSL connection\n");
        goto end;
    }

    if (error_writing_log) {
        printf("Error encountered while logging\n");
        goto end;
    }

    if ((client_log_buffer_index == 0) || (server_log_buffer_index == 0)) {
        printf("No logs written\n");
        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_keylog_output(client_log_buffer, clientssl,
                            SSL_get_session(clientssl), &expected)) {
        printf("Error encountered in client log buffer\n");
        goto end;
    }

    expected.rsa_key_exchange_count = 0;
    if (!test_keylog_output(server_log_buffer, serverssl,
                            SSL_get_session(serverssl), &expected)) {
        printf("Error encountered in server log buffer\n");
        goto end;
    }

    testresult = 1;

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

    return testresult;
}

#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, LOG_BUFFER_SIZE + 1);
    memset(server_log_buffer, 0, LOG_BUFFER_SIZE + 1);
    client_log_buffer_index = 0;
    server_log_buffer_index = 0;
    error_writing_log = 0;

    if (!create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(), &sctx,
                             &cctx, cert, privkey)) {
        printf("Unable to create SSL_CTX pair\n");
        return 0;
    }

    if (SSL_CTX_get_keylog_callback(cctx)) {
        printf("Unexpected initial value for client "
               "SSL_CTX_get_keylog_callback()\n");
        goto end;
    }
    if (SSL_CTX_get_keylog_callback(sctx)) {
        printf("Unexpected initial value for server "
               "SSL_CTX_get_keylog_callback()\n");
        goto end;
    }

    SSL_CTX_set_keylog_callback(cctx, client_keylog_callback);
    SSL_CTX_set_keylog_callback(sctx, server_keylog_callback);

    if (SSL_CTX_get_keylog_callback(cctx) != client_keylog_callback) {
        printf("Unexpected set value for client "
               "SSL_CTX_get_keylog_callback()\n");
    }

    if (SSL_CTX_get_keylog_callback(sctx) != server_keylog_callback) {
        printf("Unexpected set value for server "
               "SSL_CTX_get_keylog_callback()\n");
    }

    /* Now do a handshake and check that the logs have been written to. */
    if (!create_ssl_objects(sctx, cctx, &serverssl, &clientssl, NULL, NULL)) {
        printf("Unable to create SSL objects\n");
        goto end;
    }

    if (!create_ssl_connection(serverssl, clientssl, SSL_ERROR_NONE)) {
        printf("Unable to create SSL connection\n");
        goto end;
    }

    if (error_writing_log) {
        printf("Error encountered while logging\n");
        goto end;
    }

    /*
     * Now we want to test that our output data was vaguely sensible. For this
     * test, we expect no CLIENT_RANDOM entry becuase 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_keylog_output(client_log_buffer, clientssl,
                            SSL_get_session(clientssl), &expected)) {
        printf("Error encountered in client log buffer\n");
        goto end;
    }
    if (!test_keylog_output(server_log_buffer, serverssl,
                            SSL_get_session(serverssl), &expected)) {
        printf("Error encountered in server log buffer\n");
        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 read_ahead)
{
    SSL_CTX *cctx = NULL, *sctx = NULL;
    SSL *clientssl = NULL, *serverssl = NULL;
    int testresult = 0;
    int i;
    BIO *certbio = BIO_new_file(cert, "r");
    X509 *chaincert = NULL;
    int certlen;

    if (certbio == NULL) {
        printf("Can't load the certficate file\n");
        goto end;
    }
    chaincert = PEM_read_bio_X509(certbio, NULL, NULL, NULL);
    BIO_free(certbio);
    certbio = NULL;
    if (chaincert == NULL) {
        printf("Unable to load certificate for chain\n");
        goto end;
    }

    if (!create_ssl_ctx_pair(smeth, cmeth, &sctx,
                             &cctx, cert, privkey)) {
        printf("Unable to create SSL_CTX pair\n");
        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 allocing 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)) {
            printf("Unable to up ref cert\n");
            goto end;
        }
        if (!SSL_CTX_add_extra_chain_cert(sctx, chaincert)) {
            printf("Unable to add extra chain cert %d\n", i);
            X509_free(chaincert);
            goto end;
        }
    }

    if (!create_ssl_objects(sctx, cctx, &serverssl, &clientssl, NULL, NULL)) {
        printf("Unable to create SSL objects\n");
        goto end;
    }

    if (!create_ssl_connection(serverssl, clientssl, SSL_ERROR_NONE)) {
        printf("Unable to create SSL connection\n");
        goto end;
    }

    /*
     * Calling SSL_clear() first is not required but this tests that SSL_clear()
     * doesn't leak (when using enable-crypto-mdebug).
     */
    if (!SSL_clear(serverssl)) {
        printf("Unexpected failure from SSL_clear()\n");
        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(),
                                      0);
}

static int test_large_message_tls_read_ahead(void)
{
    return execute_test_large_message(TLS_server_method(), TLS_client_method(),
                                      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(), 0);
}
#endif

#ifndef OPENSSL_NO_OCSP
static int ocsp_server_cb(SSL *s, void *arg)
{
    int *argi = (int *)arg;
    unsigned char *orespdercopy = 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;
    }


    orespdercopy = OPENSSL_memdup(orespder, sizeof(orespder));
    if (orespdercopy == NULL)
        return SSL_TLSEXT_ERR_ALERT_FATAL;

    SSL_set_tlsext_status_ocsp_resp(s, orespdercopy, 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 (memcmp(orespder, respderin, len) != 0)
        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(), &sctx,
                             &cctx, cert, privkey)) {
        printf("Unable to create SSL_CTX pair\n");
        return 0;
    }

    if (SSL_CTX_get_tlsext_status_type(cctx) != -1) {
        printf("Unexpected initial value for "
               "SSL_CTX_get_tlsext_status_type()\n");
        goto end;
    }

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

    clientssl = SSL_new(cctx);
    if (SSL_get_tlsext_status_type(clientssl) != -1) {
        printf("Unexpected initial value for SSL_get_tlsext_status_type()\n");
        goto end;
    }

    if (!SSL_set_tlsext_status_type(clientssl, TLSEXT_STATUSTYPE_ocsp)) {
        printf("Unexpected fail for SSL_set_tlsext_status_type()\n");
        goto end;
    }

    if (SSL_get_tlsext_status_type(clientssl) != TLSEXT_STATUSTYPE_ocsp) {
        printf("Unexpected result for SSL_get_tlsext_status_type()\n");
        goto end;
    }

    SSL_free(clientssl);
    clientssl = NULL;

    if (!SSL_CTX_set_tlsext_status_type(cctx, TLSEXT_STATUSTYPE_ocsp)) {
        printf("Unexpected fail for SSL_CTX_set_tlsext_status_type()\n");
        goto end;
    }

    if (SSL_CTX_get_tlsext_status_type(cctx) != TLSEXT_STATUSTYPE_ocsp) {
        printf("Unexpected result for SSL_CTX_get_tlsext_status_type()\n");
        goto end;
    }

    clientssl = SSL_new(cctx);

    if (SSL_get_tlsext_status_type(clientssl) != TLSEXT_STATUSTYPE_ocsp) {
        printf("Unexpected result for SSL_get_tlsext_status_type() (test 2)\n");
        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 (!create_ssl_objects(sctx, cctx, &serverssl, &clientssl, NULL, NULL)) {
        printf("Unable to create SSL objects\n");
        goto end;
    }

    if (!create_ssl_connection(serverssl, clientssl, SSL_ERROR_NONE)) {
        printf("Unable to create SSL connection\n");
        goto end;
    }

    if (!ocsp_client_called || !ocsp_server_called) {
        printf("OCSP callbacks not called\n");
        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 (!create_ssl_objects(sctx, cctx, &serverssl, &clientssl, NULL, NULL)) {
        printf("Unable to create SSL objects\n");
        goto end;
    }

    /* This should fail because the callback will fail */
    if (create_ssl_connection(serverssl, clientssl, SSL_ERROR_NONE)) {
        printf("Unexpected success creating the connection\n");
        goto end;
    }

    if (ocsp_client_called || ocsp_server_called) {
        printf("OCSP callbacks successfully called unexpectedly\n");
        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 (!create_ssl_objects(sctx, cctx, &serverssl, &clientssl, NULL, NULL)) {
        printf("Unable to create SSL objects\n");
        goto end;
    }

    /*
     * We'll just use any old cert for this test - it doesn't have to be an OCSP
     * specifc one. We'll use the server cert.
     */
    certbio = BIO_new_file(cert, "r");
    if (certbio == NULL) {
        printf("Can't load the certficate file\n");
        goto end;
    }
    id = OCSP_RESPID_new();
    ids = sk_OCSP_RESPID_new_null();
    ocspcert = PEM_read_bio_X509(certbio, NULL, NULL, NULL);
    if (id == NULL || ids == NULL || ocspcert == NULL
            || !OCSP_RESPID_set_by_key(id, ocspcert)
            || !sk_OCSP_RESPID_push(ids, id)) {
        printf("Unable to set OCSP_RESPIDs\n");
        goto end;
    }
    id = NULL;
    SSL_set_tlsext_status_ids(clientssl, ids);
    /* Control has been transferred */
    ids = NULL;

    BIO_free(certbio);
    certbio = NULL;

    if (!create_ssl_connection(serverssl, clientssl, SSL_ERROR_NONE)) {
        printf("Unable to create SSL connection\n");
        goto end;
    }

    if (!ocsp_client_called || !ocsp_server_called) {
        printf("OCSP callbacks not called\n");
        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

typedef struct ssl_session_test_fixture {
    const char *test_case_name;
    int use_ext_cache;
    int use_int_cache;
} SSL_SESSION_TEST_FIXTURE;

static int new_called = 0, remove_called = 0;

static SSL_SESSION_TEST_FIXTURE
ssl_session_set_up(const char *const test_case_name)
{
    SSL_SESSION_TEST_FIXTURE fixture;

    fixture.test_case_name = test_case_name;
    fixture.use_ext_cache = 1;
    fixture.use_int_cache = 1;

    new_called = remove_called = 0;

    return fixture;
}

static void ssl_session_tear_down(SSL_SESSION_TEST_FIXTURE fixture)
{
}

static int new_session_cb(SSL *ssl, SSL_SESSION *sess)
{
    new_called++;

    return 1;
}

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

static int execute_test_session(SSL_SESSION_TEST_FIXTURE fix)
{
    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;

    if (!create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(), &sctx,
                             &cctx, cert, privkey)) {
        printf("Unable to create SSL_CTX pair\n");
        return 0;
    }

#ifndef OPENSSL_NO_TLS1_2
    /* Only allow TLS1.2 so we can force a connection failure later */
    SSL_CTX_set_min_proto_version(cctx, TLS1_2_VERSION);
#endif

    /* Set up session cache */
    if (fix.use_ext_cache) {
        SSL_CTX_sess_set_new_cb(cctx, new_session_cb);
        SSL_CTX_sess_set_remove_cb(cctx, remove_session_cb);
    }
    if (fix.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 (!create_ssl_objects(sctx, cctx, &serverssl1, &clientssl1, NULL,
                               NULL)) {
        printf("Unable to create SSL objects\n");
        goto end;
    }

    if (!create_ssl_connection(serverssl1, clientssl1, SSL_ERROR_NONE)) {
        printf("Unable to create SSL connection\n");
        goto end;
    }
    sess1 = SSL_get1_session(clientssl1);
    if (sess1 == NULL) {
        printf("Unexpected NULL session\n");
        goto end;
    }

    if (fix.use_int_cache && SSL_CTX_add_session(cctx, sess1)) {
        /* Should have failed because it should already be in the cache */
        printf("Unexpected success adding session to cache\n");
        goto end;
    }

    if (fix.use_ext_cache && (new_called != 1 || remove_called != 0)) {
        printf("Session not added to cache\n");
        goto end;
    }

    if (!create_ssl_objects(sctx, cctx, &serverssl2, &clientssl2, NULL, NULL)) {
        printf("Unable to create second SSL objects\n");
        goto end;
    }

    if (!create_ssl_connection(serverssl2, clientssl2, SSL_ERROR_NONE)) {
        printf("Unable to create second SSL connection\n");
        goto end;
    }

    sess2 = SSL_get1_session(clientssl2);
    if (sess2 == NULL) {
        printf("Unexpected NULL session from clientssl2\n");
        goto end;
    }

    if (fix.use_ext_cache && (new_called != 2 || remove_called != 0)) {
        printf("Remove session callback unexpectedly called\n");
        goto end;
    }

    /*
     * This should clear sess2 from the cache because it is a "bad" session. See
     * SSL_set_session() documentation.
     */
    if (!SSL_set_session(clientssl2, sess1)) {
        printf("Unexpected failure setting session\n");
        goto end;
    }

    if (fix.use_ext_cache && (new_called != 2 || remove_called != 1)) {
        printf("Failed to call callback to remove session\n");
        goto end;
    }


    if (SSL_get_session(clientssl2) != sess1) {
        printf("Unexpected session found\n");
        goto end;
    }

    if (fix.use_int_cache) {
        if (!SSL_CTX_add_session(cctx, sess2)) {
            /*
             * Should have succeeded because it should not already be in the cache
             */
            printf("Unexpected failure adding session to cache\n");
            goto end;
        }

        if (!SSL_CTX_remove_session(cctx, sess2)) {
            printf("Unexpected failure removing session from cache\n");
            goto end;
        }

        /* This is for the purposes of internal cache testing...ignore the
         * counter for external cache
         */
        if (fix.use_ext_cache)
            remove_called--;
    }

    /* This shouldn't be in the cache so should fail */
    if (SSL_CTX_remove_session(cctx, sess2)) {
        printf("Unexpected success removing session from cache\n");
        goto end;
    }

    if (fix.use_ext_cache && (new_called != 2 || remove_called != 2)) {
        printf("Failed to call callback to remove session #2\n");
        goto end;