2 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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
7 * https://www.openssl.org/source/license.html
12 #include <openssl/bio.h>
13 #include <openssl/x509_vfy.h>
14 #include <openssl/ssl.h>
16 #include "handshake_helper.h"
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.
23 typedef struct handshake_ex_data {
26 int session_ticket_do_not_call;
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) {
53 static int broken_session_ticket_callback(SSL* s, unsigned char* key_name, unsigned char *iv,
54 EVP_CIPHER_CTX *ctx, HMAC_CTX *hctx, int enc)
59 int do_not_call_session_ticket_callback(SSL* s, unsigned char* key_name, unsigned char *iv,
60 EVP_CIPHER_CTX *ctx, HMAC_CTX *hctx, int enc)
62 HANDSHAKE_EX_DATA *ex_data =
63 (HANDSHAKE_EX_DATA*)(SSL_get_ex_data(s, ex_data_idx));
64 ex_data->session_ticket_do_not_call = 1;
69 * Configure callbacks and other properties that can't be set directly
70 * in the server/client CONF.
72 static void configure_handshake_ctx(SSL_CTX *server_ctx, SSL_CTX *client_ctx,
73 const SSL_TEST_CTX *test_ctx)
75 switch (test_ctx->client_verify_callback) {
76 case SSL_TEST_VERIFY_ACCEPT_ALL:
77 SSL_CTX_set_cert_verify_callback(client_ctx, &verify_accept_callback,
80 case SSL_TEST_VERIFY_REJECT_ALL:
81 SSL_CTX_set_cert_verify_callback(client_ctx, &verify_reject_callback,
87 if (test_ctx->session_ticket_expected == SSL_TEST_SESSION_TICKET_BROKEN) {
88 SSL_CTX_set_tlsext_ticket_key_cb(server_ctx, broken_session_ticket_callback);
93 * Configure callbacks and other properties that can't be set directly
94 * in the server/client CONF.
96 static void configure_handshake_ssl(SSL *server, SSL *client,
97 const SSL_TEST_CTX *test_ctx)
99 SSL_set_tlsext_host_name(client, ssl_servername_name(test_ctx->servername));
109 static peer_status_t do_handshake_step(SSL *ssl)
113 ret = SSL_do_handshake(ssl);
117 } else if (ret == 0) {
120 int error = SSL_get_error(ssl, ret);
121 /* Memory bios should never block with SSL_ERROR_WANT_WRITE. */
122 if (error == SSL_ERROR_WANT_READ)
130 /* Both parties succeeded. */
132 /* Client errored. */
134 /* Server errored. */
136 /* Peers are in inconsistent state. */
138 /* One or both peers not done. */
140 } handshake_status_t;
143 * Determine the handshake outcome.
144 * last_status: the status of the peer to have acted last.
145 * previous_status: the status of the peer that didn't act last.
146 * client_spoke_last: 1 if the client went last.
148 static handshake_status_t handshake_status(peer_status_t last_status,
149 peer_status_t previous_status,
150 int client_spoke_last)
152 switch (last_status) {
154 switch (previous_status) {
156 /* Both succeeded. */
157 return HANDSHAKE_SUCCESS;
159 /* Let the first peer finish. */
160 return HANDSHAKE_RETRY;
163 * Second peer succeeded despite the fact that the first peer
164 * already errored. This shouldn't happen.
166 return INTERNAL_ERROR;
170 if (previous_status == PEER_RETRY) {
171 /* Neither peer is done. */
172 return HANDSHAKE_RETRY;
175 * Deadlock: second peer is waiting for more input while first
176 * peer thinks they're done (no more input is coming).
178 return INTERNAL_ERROR;
181 switch (previous_status) {
184 * First peer succeeded but second peer errored.
185 * TODO(emilia): we should be able to continue here (with some
186 * application data?) to ensure the first peer receives the
187 * alert / close_notify.
189 return client_spoke_last ? CLIENT_ERROR : SERVER_ERROR;
191 /* We errored; let the peer finish. */
192 return HANDSHAKE_RETRY;
194 /* Both peers errored. Return the one that errored first. */
195 return client_spoke_last ? SERVER_ERROR : CLIENT_ERROR;
198 /* Control should never reach here. */
199 return INTERNAL_ERROR;
202 HANDSHAKE_RESULT do_handshake(SSL_CTX *server_ctx, SSL_CTX *client_ctx,
203 const SSL_TEST_CTX *test_ctx)
205 SSL *server, *client;
206 BIO *client_to_server, *server_to_client;
207 HANDSHAKE_EX_DATA server_ex_data, client_ex_data;
208 HANDSHAKE_RESULT ret;
210 peer_status_t client_status = PEER_RETRY, server_status = PEER_RETRY;
211 handshake_status_t status = HANDSHAKE_RETRY;
212 unsigned char* tick = NULL;
214 SSL_SESSION* sess = NULL;
216 configure_handshake_ctx(server_ctx, client_ctx, test_ctx);
218 server = SSL_new(server_ctx);
219 client = SSL_new(client_ctx);
220 OPENSSL_assert(server != NULL && client != NULL);
222 configure_handshake_ssl(server, client, test_ctx);
224 memset(&server_ex_data, 0, sizeof(server_ex_data));
225 memset(&client_ex_data, 0, sizeof(client_ex_data));
226 memset(&ret, 0, sizeof(ret));
227 ret.result = SSL_TEST_INTERNAL_ERROR;
229 client_to_server = BIO_new(BIO_s_mem());
230 server_to_client = BIO_new(BIO_s_mem());
232 OPENSSL_assert(client_to_server != NULL && server_to_client != NULL);
234 /* Non-blocking bio. */
235 BIO_set_nbio(client_to_server, 1);
236 BIO_set_nbio(server_to_client, 1);
238 SSL_set_connect_state(client);
239 SSL_set_accept_state(server);
241 /* The bios are now owned by the SSL object. */
242 SSL_set_bio(client, server_to_client, client_to_server);
243 OPENSSL_assert(BIO_up_ref(server_to_client) > 0);
244 OPENSSL_assert(BIO_up_ref(client_to_server) > 0);
245 SSL_set_bio(server, client_to_server, server_to_client);
247 ex_data_idx = SSL_get_ex_new_index(0, "ex data", NULL, NULL, NULL);
248 OPENSSL_assert(ex_data_idx >= 0);
250 OPENSSL_assert(SSL_set_ex_data(server, ex_data_idx,
251 &server_ex_data) == 1);
252 OPENSSL_assert(SSL_set_ex_data(client, ex_data_idx,
253 &client_ex_data) == 1);
255 SSL_set_info_callback(server, &info_callback);
256 SSL_set_info_callback(client, &info_callback);
259 * Half-duplex handshake loop.
260 * Client and server speak to each other synchronously in the same process.
261 * We use non-blocking BIOs, so whenever one peer blocks for read, it
262 * returns PEER_RETRY to indicate that it's the other peer's turn to write.
263 * The handshake succeeds once both peers have succeeded. If one peer
264 * errors out, we also let the other peer retry (and presumably fail).
268 client_status = do_handshake_step(client);
269 status = handshake_status(client_status, server_status,
270 1 /* client went last */);
272 server_status = do_handshake_step(server);
273 status = handshake_status(server_status, client_status,
274 0 /* server went last */);
278 case HANDSHAKE_SUCCESS:
279 ret.result = SSL_TEST_SUCCESS;
282 ret.result = SSL_TEST_CLIENT_FAIL;
285 ret.result = SSL_TEST_SERVER_FAIL;
288 ret.result = SSL_TEST_INTERNAL_ERROR;
290 case HANDSHAKE_RETRY:
297 ret.server_alert_sent = server_ex_data.alert_sent;
298 ret.server_alert_received = client_ex_data.alert_received;
299 ret.client_alert_sent = client_ex_data.alert_sent;
300 ret.client_alert_received = server_ex_data.alert_received;
301 ret.server_protocol = SSL_version(server);
302 ret.client_protocol = SSL_version(client);
303 ret.servername = ((SSL_get_SSL_CTX(server) == server_ctx)
304 ? SSL_TEST_SERVERNAME_SERVER1
305 : SSL_TEST_SERVERNAME_SERVER2);
306 if ((sess = SSL_get0_session(client)) != NULL)
307 SSL_SESSION_get0_ticket(sess, &tick, &len);
308 if (tick == NULL || len == 0)
309 ret.session_ticket = SSL_TEST_SESSION_TICKET_NO;
311 ret.session_ticket = SSL_TEST_SESSION_TICKET_YES;
312 ret.session_ticket_do_not_call = server_ex_data.session_ticket_do_not_call;