2 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL licenses, (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 * https://www.openssl.org/source/license.html
8 * or in the file LICENSE in the source distribution.
13 #include <openssl/bio.h>
14 #include <openssl/x509_vfy.h>
15 #include <openssl/ssl.h>
17 #include "handshake_helper.h"
20 * Since there appears to be no way to extract the sent/received alert
21 * from the SSL object directly, we use the info callback and stash
22 * the result in ex_data.
24 typedef struct handshake_ex_data {
29 static int ex_data_idx;
31 static void info_callback(const SSL *s, int where, int ret)
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;
39 ex_data->alert_received = ret;
44 static int verify_reject_callback(X509_STORE_CTX *ctx, void *arg) {
45 X509_STORE_CTX_set_error(ctx, X509_V_ERR_APPLICATION_VERIFICATION);
49 static int verify_accept_callback(X509_STORE_CTX *ctx, void *arg) {
54 * Configure callbacks and other properties that can't be set directly
55 * in the server/client CONF.
57 static void configure_handshake(SSL_CTX *server_ctx, SSL_CTX *client_ctx,
58 const SSL_TEST_CTX *test_ctx)
60 switch (test_ctx->client_verify_callback) {
61 case SSL_TEST_VERIFY_ACCEPT_ALL:
62 SSL_CTX_set_cert_verify_callback(client_ctx, &verify_accept_callback,
65 case SSL_TEST_VERIFY_REJECT_ALL:
66 SSL_CTX_set_cert_verify_callback(client_ctx, &verify_reject_callback,
81 static peer_status_t do_handshake_step(SSL *ssl)
85 ret = SSL_do_handshake(ssl);
89 } else if (ret == 0) {
92 int error = SSL_get_error(ssl, ret);
93 /* Memory bios should never block with SSL_ERROR_WANT_WRITE. */
94 if (error == SSL_ERROR_WANT_READ)
102 /* Both parties succeeded. */
104 /* Client errored. */
106 /* Server errored. */
108 /* Peers are in inconsistent state. */
110 /* One or both peers not done. */
112 } handshake_status_t;
115 * Determine the handshake outcome.
116 * last_status: the status of the peer to have acted last.
117 * previous_status: the status of the peer that didn't act last.
118 * client_spoke_last: 1 if the client went last.
120 static handshake_status_t handshake_status(peer_status_t last_status,
121 peer_status_t previous_status,
122 int client_spoke_last)
124 switch (last_status) {
126 switch (previous_status) {
128 /* Both succeeded. */
129 return HANDSHAKE_SUCCESS;
131 /* Let the first peer finish. */
132 return HANDSHAKE_RETRY;
135 * Second peer succeeded despite the fact that the first peer
136 * already errored. This shouldn't happen.
138 return INTERNAL_ERROR;
142 if (previous_status == PEER_RETRY) {
143 /* Neither peer is done. */
144 return HANDSHAKE_RETRY;
147 * Deadlock: second peer is waiting for more input while first
148 * peer thinks they're done (no more input is coming).
150 return INTERNAL_ERROR;
153 switch (previous_status) {
156 * First peer succeeded but second peer errored.
157 * TODO(emilia): we should be able to continue here (with some
158 * application data?) to ensure the first peer receives the
159 * alert / close_notify.
161 return client_spoke_last ? CLIENT_ERROR : SERVER_ERROR;
163 /* We errored; let the peer finish. */
164 return HANDSHAKE_RETRY;
166 /* Both peers errored. Return the one that errored first. */
167 return client_spoke_last ? SERVER_ERROR : CLIENT_ERROR;
170 /* Control should never reach here. */
171 return INTERNAL_ERROR;
174 HANDSHAKE_RESULT do_handshake(SSL_CTX *server_ctx, SSL_CTX *client_ctx,
175 const SSL_TEST_CTX *test_ctx)
177 SSL *server, *client;
178 BIO *client_to_server, *server_to_client;
179 HANDSHAKE_EX_DATA server_ex_data, client_ex_data;
180 HANDSHAKE_RESULT ret;
182 peer_status_t client_status = PEER_RETRY, server_status = PEER_RETRY;
183 handshake_status_t status = HANDSHAKE_RETRY;
185 configure_handshake(server_ctx, client_ctx, test_ctx);
187 server = SSL_new(server_ctx);
188 client = SSL_new(client_ctx);
189 OPENSSL_assert(server != NULL && client != NULL);
191 memset(&server_ex_data, 0, sizeof(server_ex_data));
192 memset(&client_ex_data, 0, sizeof(client_ex_data));
193 memset(&ret, 0, sizeof(ret));
194 ret.result = SSL_TEST_INTERNAL_ERROR;
196 client_to_server = BIO_new(BIO_s_mem());
197 server_to_client = BIO_new(BIO_s_mem());
199 OPENSSL_assert(client_to_server != NULL && server_to_client != NULL);
201 /* Non-blocking bio. */
202 BIO_set_nbio(client_to_server, 1);
203 BIO_set_nbio(server_to_client, 1);
205 SSL_set_connect_state(client);
206 SSL_set_accept_state(server);
208 /* The bios are now owned by the SSL object. */
209 SSL_set_bio(client, server_to_client, client_to_server);
210 OPENSSL_assert(BIO_up_ref(server_to_client) > 0);
211 OPENSSL_assert(BIO_up_ref(client_to_server) > 0);
212 SSL_set_bio(server, client_to_server, server_to_client);
214 ex_data_idx = SSL_get_ex_new_index(0, "ex data", NULL, NULL, NULL);
215 OPENSSL_assert(ex_data_idx >= 0);
217 OPENSSL_assert(SSL_set_ex_data(server, ex_data_idx,
218 &server_ex_data) == 1);
219 OPENSSL_assert(SSL_set_ex_data(client, ex_data_idx,
220 &client_ex_data) == 1);
222 SSL_set_info_callback(server, &info_callback);
223 SSL_set_info_callback(client, &info_callback);
226 * Half-duplex handshake loop.
227 * Client and server speak to each other synchronously in the same process.
228 * We use non-blocking BIOs, so whenever one peer blocks for read, it
229 * returns PEER_RETRY to indicate that it's the other peer's turn to write.
230 * The handshake succeeds once both peers have succeeded. If one peer
231 * errors out, we also let the other peer retry (and presumably fail).
235 client_status = do_handshake_step(client);
236 status = handshake_status(client_status, server_status,
237 1 /* client went last */);
239 server_status = do_handshake_step(server);
240 status = handshake_status(server_status, client_status,
241 0 /* server went last */);
245 case HANDSHAKE_SUCCESS:
246 ret.result = SSL_TEST_SUCCESS;
249 ret.result = SSL_TEST_CLIENT_FAIL;
252 ret.result = SSL_TEST_SERVER_FAIL;
255 ret.result = SSL_TEST_INTERNAL_ERROR;
257 case HANDSHAKE_RETRY:
264 ret.server_alert_sent = server_ex_data.alert_sent;
265 ret.server_alert_received = client_ex_data.alert_received;
266 ret.client_alert_sent = client_ex_data.alert_sent;
267 ret.client_alert_received = server_ex_data.alert_received;
268 ret.server_protocol = SSL_version(server);
269 ret.client_protocol = SSL_version(client);