[thirdparty/openssl.git] / test / handshake_helper.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/bio.h>
#include <openssl/x509_vfy.h>
#include <openssl/ssl.h>

#include "handshake_helper.h"

/*
 * Since there appears to be no way to extract the sent/received alert
 * from the SSL object directly, we use the info callback and stash
 * the result in ex_data.
 */
typedef struct handshake_ex_data {
    int alert_sent;
    int alert_received;
    int session_ticket_do_not_call;
} HANDSHAKE_EX_DATA;

static int ex_data_idx;

static void info_callback(const SSL *s, int where, int ret)
{
    if (where & SSL_CB_ALERT) {
        HANDSHAKE_EX_DATA *ex_data =
            (HANDSHAKE_EX_DATA*)(SSL_get_ex_data(s, ex_data_idx));
        if (where & SSL_CB_WRITE) {
            ex_data->alert_sent = ret;
        } else {
            ex_data->alert_received = ret;
        }
    }
}

static int servername_callback(SSL *s, int *ad, void *arg)
{
    const char *servername = SSL_get_servername(s, TLSEXT_NAMETYPE_host_name);
    if (servername != NULL && !strcmp(servername, "server2")) {
        SSL_CTX *new_ctx = (SSL_CTX*)arg;
        SSL_set_SSL_CTX(s, new_ctx);
        /*
         * Copy over all the SSL_CTX options - reasonable behavior
         * allows testing of cases where the options between two
         * contexts differ/conflict
         */
        SSL_clear_options(s, 0xFFFFFFFFL);
        SSL_set_options(s, SSL_CTX_get_options(new_ctx));
    }
    return SSL_TLSEXT_ERR_OK;
}

static int verify_reject_callback(X509_STORE_CTX *ctx, void *arg) {
    X509_STORE_CTX_set_error(ctx, X509_V_ERR_APPLICATION_VERIFICATION);
    return 0;
}

static int verify_accept_callback(X509_STORE_CTX *ctx, void *arg) {
    return 1;
}

static int broken_session_ticket_callback(SSL* s, unsigned char* key_name, unsigned char *iv,
                                          EVP_CIPHER_CTX *ctx, HMAC_CTX *hctx, int enc)
{
    return 0;
}

static int do_not_call_session_ticket_callback(SSL* s, unsigned char* key_name,
                                               unsigned char *iv,
                                               EVP_CIPHER_CTX *ctx,
                                               HMAC_CTX *hctx, int enc)
{
    HANDSHAKE_EX_DATA *ex_data =
        (HANDSHAKE_EX_DATA*)(SSL_get_ex_data(s, ex_data_idx));
    ex_data->session_ticket_do_not_call = 1;
    return 0;
}

/*
 * Configure callbacks and other properties that can't be set directly
 * in the server/client CONF.
 */
static void configure_handshake_ctx(SSL_CTX *server_ctx, SSL_CTX *server2_ctx,
                                    SSL_CTX *client_ctx,
                                    const SSL_TEST_CTX *test_ctx)
{
    switch (test_ctx->client_verify_callback) {
    case SSL_TEST_VERIFY_ACCEPT_ALL:
        SSL_CTX_set_cert_verify_callback(client_ctx, &verify_accept_callback,
                                         NULL);
        break;
    case SSL_TEST_VERIFY_REJECT_ALL:
        SSL_CTX_set_cert_verify_callback(client_ctx, &verify_reject_callback,
                                         NULL);
        break;
    default:
        break;
    }

    /* link the two contexts for SNI purposes */
    SSL_CTX_set_tlsext_servername_callback(server_ctx, servername_callback);
    SSL_CTX_set_tlsext_servername_arg(server_ctx, server2_ctx);
    /*
     * The initial_ctx/session_ctx always handles the encrypt/decrypt of the
     * session ticket. This ticket_key callback is assigned to the second
     * session (assigned via SNI), and should never be invoked
     */
    SSL_CTX_set_tlsext_ticket_key_cb(server2_ctx, do_not_call_session_ticket_callback);

    if (test_ctx->session_ticket_expected == SSL_TEST_SESSION_TICKET_BROKEN) {
        SSL_CTX_set_tlsext_ticket_key_cb(server_ctx, broken_session_ticket_callback);
    }
}

/*
 * Configure callbacks and other properties that can't be set directly
 * in the server/client CONF.
 */
static void configure_handshake_ssl(SSL *server, SSL *client,
                                    const SSL_TEST_CTX *test_ctx)
{
    if (test_ctx->servername != SSL_TEST_SERVERNAME_NONE)
        SSL_set_tlsext_host_name(client,
                                 ssl_servername_name(test_ctx->servername));
}


typedef enum {
    PEER_SUCCESS,
    PEER_RETRY,
    PEER_ERROR
} peer_status_t;

static peer_status_t do_handshake_step(SSL *ssl)
{
    int ret;

    ret = SSL_do_handshake(ssl);

    if (ret == 1) {
        return PEER_SUCCESS;
    } else if (ret == 0) {
        return PEER_ERROR;
    } else {
        int error = SSL_get_error(ssl, ret);
        /* Memory bios should never block with SSL_ERROR_WANT_WRITE. */
        if (error == SSL_ERROR_WANT_READ)
            return PEER_RETRY;
        else
            return PEER_ERROR;
    }
}

typedef enum {
    /* Both parties succeeded. */
    HANDSHAKE_SUCCESS,
    /* Client errored. */
    CLIENT_ERROR,
    /* Server errored. */
    SERVER_ERROR,
    /* Peers are in inconsistent state. */
    INTERNAL_ERROR,
    /* One or both peers not done. */
    HANDSHAKE_RETRY
} handshake_status_t;

/*
 * Determine the handshake outcome.
 * last_status: the status of the peer to have acted last.
 * previous_status: the status of the peer that didn't act last.
 * client_spoke_last: 1 if the client went last.
 */
static handshake_status_t handshake_status(peer_status_t last_status,
                                           peer_status_t previous_status,
                                           int client_spoke_last)
{
    switch (last_status) {
    case PEER_SUCCESS:
        switch (previous_status) {
        case PEER_SUCCESS:
            /* Both succeeded. */
            return HANDSHAKE_SUCCESS;
        case PEER_RETRY:
            /* Let the first peer finish. */
            return HANDSHAKE_RETRY;
        case PEER_ERROR:
            /*
             * Second peer succeeded despite the fact that the first peer
             * already errored. This shouldn't happen.
             */
            return INTERNAL_ERROR;
        }

    case PEER_RETRY:
        if (previous_status == PEER_RETRY) {
            /* Neither peer is done. */
            return HANDSHAKE_RETRY;
        } else {
            /*
             * Deadlock: second peer is waiting for more input while first
             * peer thinks they're done (no more input is coming).
             */
            return INTERNAL_ERROR;
        }
    case PEER_ERROR:
        switch (previous_status) {
        case PEER_SUCCESS:
            /*
             * First peer succeeded but second peer errored.
             * TODO(emilia): we should be able to continue here (with some
             * application data?) to ensure the first peer receives the
             * alert / close_notify.
             */
            return client_spoke_last ? CLIENT_ERROR : SERVER_ERROR;
        case PEER_RETRY:
            /* We errored; let the peer finish. */
            return HANDSHAKE_RETRY;
        case PEER_ERROR:
            /* Both peers errored. Return the one that errored first. */
            return client_spoke_last ? SERVER_ERROR : CLIENT_ERROR;
        }
    }
    /* Control should never reach here. */
    return INTERNAL_ERROR;
}

HANDSHAKE_RESULT do_handshake(SSL_CTX *server_ctx, SSL_CTX *server2_ctx,
                              SSL_CTX *client_ctx, const SSL_TEST_CTX *test_ctx)
{
    SSL *server, *client;
    BIO *client_to_server, *server_to_client;
    HANDSHAKE_EX_DATA server_ex_data, client_ex_data;
    HANDSHAKE_RESULT ret;
    int client_turn = 1;
    peer_status_t client_status = PEER_RETRY, server_status = PEER_RETRY;
    handshake_status_t status = HANDSHAKE_RETRY;
    unsigned char* tick = NULL;
    size_t len = 0;
    SSL_SESSION* sess = NULL;

    configure_handshake_ctx(server_ctx, server2_ctx, client_ctx, test_ctx);

    server = SSL_new(server_ctx);
    client = SSL_new(client_ctx);
    OPENSSL_assert(server != NULL && client != NULL);

    configure_handshake_ssl(server, client, test_ctx);

    memset(&server_ex_data, 0, sizeof(server_ex_data));
    memset(&client_ex_data, 0, sizeof(client_ex_data));
    memset(&ret, 0, sizeof(ret));
    ret.result = SSL_TEST_INTERNAL_ERROR;

    client_to_server = BIO_new(BIO_s_mem());
    server_to_client = BIO_new(BIO_s_mem());

    OPENSSL_assert(client_to_server != NULL && server_to_client != NULL);

    /* Non-blocking bio. */
    BIO_set_nbio(client_to_server, 1);
    BIO_set_nbio(server_to_client, 1);

    SSL_set_connect_state(client);
    SSL_set_accept_state(server);

    /* The bios are now owned by the SSL object. */
    SSL_set_bio(client, server_to_client, client_to_server);
    OPENSSL_assert(BIO_up_ref(server_to_client) > 0);
    OPENSSL_assert(BIO_up_ref(client_to_server) > 0);
    SSL_set_bio(server, client_to_server, server_to_client);

    ex_data_idx = SSL_get_ex_new_index(0, "ex data", NULL, NULL, NULL);
    OPENSSL_assert(ex_data_idx >= 0);

    OPENSSL_assert(SSL_set_ex_data(server, ex_data_idx,
                                   &server_ex_data) == 1);
    OPENSSL_assert(SSL_set_ex_data(client, ex_data_idx,
                                   &client_ex_data) == 1);

    SSL_set_info_callback(server, &info_callback);
    SSL_set_info_callback(client, &info_callback);

    /*
     * Half-duplex handshake loop.
     * Client and server speak to each other synchronously in the same process.
     * We use non-blocking BIOs, so whenever one peer blocks for read, it
     * returns PEER_RETRY to indicate that it's the other peer's turn to write.
     * The handshake succeeds once both peers have succeeded. If one peer
     * errors out, we also let the other peer retry (and presumably fail).
     */
    for(;;) {
        if (client_turn) {
            client_status = do_handshake_step(client);
            status = handshake_status(client_status, server_status,
                                      1 /* client went last */);
        } else {
            server_status = do_handshake_step(server);
            status = handshake_status(server_status, client_status,
                                      0 /* server went last */);
        }

        switch (status) {
        case HANDSHAKE_SUCCESS:
            ret.result = SSL_TEST_SUCCESS;
            goto err;
        case CLIENT_ERROR:
            ret.result = SSL_TEST_CLIENT_FAIL;
            goto err;
        case SERVER_ERROR:
            ret.result = SSL_TEST_SERVER_FAIL;
            goto err;
        case INTERNAL_ERROR:
            ret.result = SSL_TEST_INTERNAL_ERROR;
            goto err;
        case HANDSHAKE_RETRY:
            /* Continue. */
            client_turn ^= 1;
            break;
        }
    }
 err:
    ret.server_alert_sent = server_ex_data.alert_sent;
    ret.server_alert_received = client_ex_data.alert_received;
    ret.client_alert_sent = client_ex_data.alert_sent;
    ret.client_alert_received = server_ex_data.alert_received;
    ret.server_protocol = SSL_version(server);
    ret.client_protocol = SSL_version(client);
    ret.servername = ((SSL_get_SSL_CTX(server) == server_ctx)
                      ? SSL_TEST_SERVERNAME_SERVER1
                      : SSL_TEST_SERVERNAME_SERVER2);
    if ((sess = SSL_get0_session(client)) != NULL)
        SSL_SESSION_get0_ticket(sess, &tick, &len);
    if (tick == NULL || len == 0)
        ret.session_ticket = SSL_TEST_SESSION_TICKET_NO;
    else
        ret.session_ticket = SSL_TEST_SESSION_TICKET_YES;
    ret.session_ticket_do_not_call = server_ex_data.session_ticket_do_not_call;

    SSL_free(server);
    SSL_free(client);
    return ret;
}
Commit	Line	Data
453dfd8d EK	1	/*
	2	* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
	3	*
440e5d80 RS	4	* Licensed under the OpenSSL license (the "License"). You may not use
	5	* this file except in compliance with the License. You can obtain a copy
	6	* in the file LICENSE in the source distribution or at
453dfd8d	7	* https://www.openssl.org/source/license.html
453dfd8d EK	8	*/
	9
	10	#include <string.h>
	11
	12	#include <openssl/bio.h>
a263f320	13	#include <openssl/x509_vfy.h>
453dfd8d EK	14	#include <openssl/ssl.h>
	15
	16	#include "handshake_helper.h"
	17
	18	/*
	19	* Since there appears to be no way to extract the sent/received alert
	20	* from the SSL object directly, we use the info callback and stash
	21	* the result in ex_data.
	22	*/
	23	typedef struct handshake_ex_data {
	24	int alert_sent;
	25	int alert_received;
5c753de6	26	int session_ticket_do_not_call;
453dfd8d EK	27	} HANDSHAKE_EX_DATA;
	28
	29	static int ex_data_idx;
	30
	31	static void info_callback(const SSL *s, int where, int ret)
	32	{
	33	if (where & SSL_CB_ALERT) {
	34	HANDSHAKE_EX_DATA *ex_data =
	35	(HANDSHAKE_EX_DATA*)(SSL_get_ex_data(s, ex_data_idx));
	36	if (where & SSL_CB_WRITE) {
	37	ex_data->alert_sent = ret;
	38	} else {
	39	ex_data->alert_received = ret;
	40	}
	41	}
	42	}
	43
81fc33c9 EK	44	static int servername_callback(SSL s, int ad, void *arg)
	45	{
	46	const char *servername = SSL_get_servername(s, TLSEXT_NAMETYPE_host_name);
	47	if (servername != NULL && !strcmp(servername, "server2")) {
	48	SSL_CTX new_ctx = (SSL_CTX)arg;
	49	SSL_set_SSL_CTX(s, new_ctx);
	50	/*
	51	* Copy over all the SSL_CTX options - reasonable behavior
	52	* allows testing of cases where the options between two
	53	* contexts differ/conflict
	54	*/
	55	SSL_clear_options(s, 0xFFFFFFFFL);
	56	SSL_set_options(s, SSL_CTX_get_options(new_ctx));
	57	}
	58	return SSL_TLSEXT_ERR_OK;
	59	}
	60
a263f320 EK	61	static int verify_reject_callback(X509_STORE_CTX ctx, void arg) {
	62	X509_STORE_CTX_set_error(ctx, X509_V_ERR_APPLICATION_VERIFICATION);
	63	return 0;
	64	}
	65
	66	static int verify_accept_callback(X509_STORE_CTX ctx, void arg) {
	67	return 1;
	68	}
	69
5c753de6 TS	70	static int broken_session_ticket_callback(SSL* s, unsigned char* key_name, unsigned char *iv,
	71	EVP_CIPHER_CTX ctx, HMAC_CTX hctx, int enc)
	72	{
	73	return 0;
	74	}
	75
81fc33c9 EK	76	static int do_not_call_session_ticket_callback(SSL* s, unsigned char* key_name,
	77	unsigned char *iv,
	78	EVP_CIPHER_CTX *ctx,
	79	HMAC_CTX *hctx, int enc)
5c753de6 TS	80	{
	81	HANDSHAKE_EX_DATA *ex_data =
	82	(HANDSHAKE_EX_DATA*)(SSL_get_ex_data(s, ex_data_idx));
	83	ex_data->session_ticket_do_not_call = 1;
	84	return 0;
	85	}
	86
a263f320 EK	87	/*
	88	* Configure callbacks and other properties that can't be set directly
	89	* in the server/client CONF.
	90	*/
81fc33c9 EK	91	static void configure_handshake_ctx(SSL_CTX server_ctx, SSL_CTX server2_ctx,
81fc33c9 EK	92	SSL_CTX *client_ctx,
5c753de6	93	const SSL_TEST_CTX *test_ctx)
a263f320 EK	94	{
	95	switch (test_ctx->client_verify_callback) {
	96	case SSL_TEST_VERIFY_ACCEPT_ALL:
	97	SSL_CTX_set_cert_verify_callback(client_ctx, &verify_accept_callback,
	98	NULL);
	99	break;
	100	case SSL_TEST_VERIFY_REJECT_ALL:
	101	SSL_CTX_set_cert_verify_callback(client_ctx, &verify_reject_callback,
	102	NULL);
	103	break;
	104	default:
	105	break;
	106	}
81fc33c9 EK	107
	108	/* link the two contexts for SNI purposes */
	109	SSL_CTX_set_tlsext_servername_callback(server_ctx, servername_callback);
	110	SSL_CTX_set_tlsext_servername_arg(server_ctx, server2_ctx);
	111	/*
	112	* The initial_ctx/session_ctx always handles the encrypt/decrypt of the
	113	* session ticket. This ticket_key callback is assigned to the second
	114	* session (assigned via SNI), and should never be invoked
	115	*/
	116	SSL_CTX_set_tlsext_ticket_key_cb(server2_ctx, do_not_call_session_ticket_callback);
	117
5c753de6 TS	118	if (test_ctx->session_ticket_expected == SSL_TEST_SESSION_TICKET_BROKEN) {
	119	SSL_CTX_set_tlsext_ticket_key_cb(server_ctx, broken_session_ticket_callback);
	120	}
	121	}
	122
	123	/*
	124	* Configure callbacks and other properties that can't be set directly
	125	* in the server/client CONF.
	126	*/
	127	static void configure_handshake_ssl(SSL server, SSL client,
	128	const SSL_TEST_CTX *test_ctx)
	129	{
81fc33c9 EK	130	if (test_ctx->servername != SSL_TEST_SERVERNAME_NONE)
	131	SSL_set_tlsext_host_name(client,
	132	ssl_servername_name(test_ctx->servername));
a263f320 EK	133	}
	134
	135
453dfd8d EK	136	typedef enum {
	137	PEER_SUCCESS,
	138	PEER_RETRY,
	139	PEER_ERROR
	140	} peer_status_t;
	141
	142	static peer_status_t do_handshake_step(SSL *ssl)
	143	{
	144	int ret;
	145
	146	ret = SSL_do_handshake(ssl);
	147
	148	if (ret == 1) {
	149	return PEER_SUCCESS;
	150	} else if (ret == 0) {
	151	return PEER_ERROR;
	152	} else {
	153	int error = SSL_get_error(ssl, ret);
	154	/* Memory bios should never block with SSL_ERROR_WANT_WRITE. */
	155	if (error == SSL_ERROR_WANT_READ)
	156	return PEER_RETRY;
	157	else
	158	return PEER_ERROR;
	159	}
	160	}
	161
	162	typedef enum {
	163	/* Both parties succeeded. */
	164	HANDSHAKE_SUCCESS,
	165	/* Client errored. */
	166	CLIENT_ERROR,
	167	/* Server errored. */
	168	SERVER_ERROR,
	169	/* Peers are in inconsistent state. */
	170	INTERNAL_ERROR,
	171	/* One or both peers not done. */
	172	HANDSHAKE_RETRY
	173	} handshake_status_t;
	174
	175	/*
	176	* Determine the handshake outcome.
	177	* last_status: the status of the peer to have acted last.
	178	* previous_status: the status of the peer that didn't act last.
	179	* client_spoke_last: 1 if the client went last.
	180	*/
	181	static handshake_status_t handshake_status(peer_status_t last_status,
	182	peer_status_t previous_status,
	183	int client_spoke_last)
	184	{
	185	switch (last_status) {
	186	case PEER_SUCCESS:
	187	switch (previous_status) {
	188	case PEER_SUCCESS:
	189	/* Both succeeded. */
	190	return HANDSHAKE_SUCCESS;
	191	case PEER_RETRY:
	192	/* Let the first peer finish. */
	193	return HANDSHAKE_RETRY;
	194	case PEER_ERROR:
	195	/*
	196	* Second peer succeeded despite the fact that the first peer
	197	* already errored. This shouldn't happen.
	198	*/
	199	return INTERNAL_ERROR;
200	}
201
202	case PEER_RETRY:
203	if (previous_status == PEER_RETRY) {
204	/* Neither peer is done. */
205	return HANDSHAKE_RETRY;
206	} else {
207	/*
208	* Deadlock: second peer is waiting for more input while first
209	* peer thinks they're done (no more input is coming).
210	*/
211	return INTERNAL_ERROR;
212	}
213	case PEER_ERROR:
214	switch (previous_status) {
215	case PEER_SUCCESS:
216	/*
217	* First peer succeeded but second peer errored.
218	* TODO(emilia): we should be able to continue here (with some
219	* application data?) to ensure the first peer receives the
220	* alert / close_notify.
221	*/
222	return client_spoke_last ? CLIENT_ERROR : SERVER_ERROR;
223	case PEER_RETRY:
224	/* We errored; let the peer finish. */
225	return HANDSHAKE_RETRY;
226	case PEER_ERROR:
227	/* Both peers errored. Return the one that errored first. */
228	return client_spoke_last ? SERVER_ERROR : CLIENT_ERROR;
229	}
230	}
231	/* Control should never reach here. */
232	return INTERNAL_ERROR;
233	}
234
81fc33c9 EK	235	HANDSHAKE_RESULT do_handshake(SSL_CTX server_ctx, SSL_CTX server2_ctx,
81fc33c9 EK	236	SSL_CTX client_ctx, const SSL_TEST_CTX test_ctx)
453dfd8d EK	237	{
	238	SSL server, client;
	239	BIO client_to_server, server_to_client;
	240	HANDSHAKE_EX_DATA server_ex_data, client_ex_data;
	241	HANDSHAKE_RESULT ret;
	242	int client_turn = 1;
	243	peer_status_t client_status = PEER_RETRY, server_status = PEER_RETRY;
	244	handshake_status_t status = HANDSHAKE_RETRY;
5c753de6 TS	245	unsigned char* tick = NULL;
	246	size_t len = 0;
	247	SSL_SESSION* sess = NULL;
453dfd8d	248
81fc33c9	249	configure_handshake_ctx(server_ctx, server2_ctx, client_ctx, test_ctx);
a263f320	250
453dfd8d EK	251	server = SSL_new(server_ctx);
	252	client = SSL_new(client_ctx);
	253	OPENSSL_assert(server != NULL && client != NULL);
	254
5c753de6 TS	255	configure_handshake_ssl(server, client, test_ctx);
5c753de6 TS	256
453dfd8d EK	257	memset(&server_ex_data, 0, sizeof(server_ex_data));
	258	memset(&client_ex_data, 0, sizeof(client_ex_data));
	259	memset(&ret, 0, sizeof(ret));
	260	ret.result = SSL_TEST_INTERNAL_ERROR;
	261
	262	client_to_server = BIO_new(BIO_s_mem());
	263	server_to_client = BIO_new(BIO_s_mem());
	264
	265	OPENSSL_assert(client_to_server != NULL && server_to_client != NULL);
	266
	267	/* Non-blocking bio. */
	268	BIO_set_nbio(client_to_server, 1);
	269	BIO_set_nbio(server_to_client, 1);
	270
	271	SSL_set_connect_state(client);
	272	SSL_set_accept_state(server);
	273
	274	/* The bios are now owned by the SSL object. */
	275	SSL_set_bio(client, server_to_client, client_to_server);
	276	OPENSSL_assert(BIO_up_ref(server_to_client) > 0);
	277	OPENSSL_assert(BIO_up_ref(client_to_server) > 0);
	278	SSL_set_bio(server, client_to_server, server_to_client);
	279
	280	ex_data_idx = SSL_get_ex_new_index(0, "ex data", NULL, NULL, NULL);
	281	OPENSSL_assert(ex_data_idx >= 0);
	282
	283	OPENSSL_assert(SSL_set_ex_data(server, ex_data_idx,
	284	&server_ex_data) == 1);
	285	OPENSSL_assert(SSL_set_ex_data(client, ex_data_idx,
	286	&client_ex_data) == 1);
	287
	288	SSL_set_info_callback(server, &info_callback);
	289	SSL_set_info_callback(client, &info_callback);
	290
	291	/*
	292	* Half-duplex handshake loop.
	293	* Client and server speak to each other synchronously in the same process.
	294	* We use non-blocking BIOs, so whenever one peer blocks for read, it
	295	* returns PEER_RETRY to indicate that it's the other peer's turn to write.
	296	* The handshake succeeds once both peers have succeeded. If one peer
	297	* errors out, we also let the other peer retry (and presumably fail).
	298	*/
	299	for(;;) {
	300	if (client_turn) {
	301	client_status = do_handshake_step(client);
	302	status = handshake_status(client_status, server_status,
	303	1 /* client went last */);
	304	} else {
	305	server_status = do_handshake_step(server);
	306	status = handshake_status(server_status, client_status,
	307	0 /* server went last */);
	308	}
	309
	310	switch (status) {
	311	case HANDSHAKE_SUCCESS:
	312	ret.result = SSL_TEST_SUCCESS;
	313	goto err;
	314	case CLIENT_ERROR:
	315	ret.result = SSL_TEST_CLIENT_FAIL;
	316	goto err;
	317	case SERVER_ERROR:
	318	ret.result = SSL_TEST_SERVER_FAIL;
	319	goto err;
	320	case INTERNAL_ERROR:
321	ret.result = SSL_TEST_INTERNAL_ERROR;
322	goto err;
323	case HANDSHAKE_RETRY:
324	/* Continue. */
325	client_turn ^= 1;
326	break;
327	}
328	}
329	err:
330	ret.server_alert_sent = server_ex_data.alert_sent;
331	ret.server_alert_received = client_ex_data.alert_received;
332	ret.client_alert_sent = client_ex_data.alert_sent;
333	ret.client_alert_received = server_ex_data.alert_received;
334	ret.server_protocol = SSL_version(server);
335	ret.client_protocol = SSL_version(client);
5c753de6 TS	336	ret.servername = ((SSL_get_SSL_CTX(server) == server_ctx)
	337	? SSL_TEST_SERVERNAME_SERVER1
	338	: SSL_TEST_SERVERNAME_SERVER2);
	339	if ((sess = SSL_get0_session(client)) != NULL)
	340	SSL_SESSION_get0_ticket(sess, &tick, &len);
	341	if (tick == NULL \|\| len == 0)
	342	ret.session_ticket = SSL_TEST_SESSION_TICKET_NO;
	343	else
	344	ret.session_ticket = SSL_TEST_SESSION_TICKET_YES;
	345	ret.session_ticket_do_not_call = server_ex_data.session_ticket_do_not_call;
453dfd8d EK	346
	347	SSL_free(server);
	348	SSL_free(client);
	349	return ret;
	350	}