1 /*
2 * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
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
8 */
9
10 #include <openssl/ssl.h>
11 #include <string.h>
12 #include "ssltestlib.h"
13 #include "testutil.h"
14 #include "../ssl/packet_local.h"
15
16 static char *cert = NULL;
17 static char *privkey = NULL;
18
19 static BIO *s_to_c_fbio = NULL, *c_to_s_fbio = NULL;
20 static int chseen = 0, shseen = 0, sccsseen = 0, ccsaftersh = 0;
21 static int ccsbeforesh = 0, sappdataseen = 0, cappdataseen = 0, badccs = 0;
22 static int badvers = 0, badsessid = 0;
23
24 static unsigned char chsessid[SSL_MAX_SSL_SESSION_ID_LENGTH];
25 static size_t chsessidlen = 0;
26
27 static int watchccs_new(BIO *bi);
28 static int watchccs_free(BIO *a);
29 static int watchccs_read(BIO *b, char *out, int outl);
30 static int watchccs_write(BIO *b, const char *in, int inl);
31 static long watchccs_ctrl(BIO *b, int cmd, long num, void *ptr);
32 static int watchccs_gets(BIO *bp, char *buf, int size);
33 static int watchccs_puts(BIO *bp, const char *str);
34
35 /* Choose a sufficiently large type likely to be unused for this custom BIO */
36 # define BIO_TYPE_WATCHCCS_FILTER (0x80 | BIO_TYPE_FILTER)
37
38 static BIO_METHOD *method_watchccs = NULL;
39
bio_f_watchccs_filter(void)40 static const BIO_METHOD *bio_f_watchccs_filter(void)
41 {
42 if (method_watchccs == NULL) {
43 method_watchccs = BIO_meth_new(BIO_TYPE_WATCHCCS_FILTER,
44 "Watch CCS filter");
45 if ( method_watchccs == NULL
46 || !BIO_meth_set_write(method_watchccs, watchccs_write)
47 || !BIO_meth_set_read(method_watchccs, watchccs_read)
48 || !BIO_meth_set_puts(method_watchccs, watchccs_puts)
49 || !BIO_meth_set_gets(method_watchccs, watchccs_gets)
50 || !BIO_meth_set_ctrl(method_watchccs, watchccs_ctrl)
51 || !BIO_meth_set_create(method_watchccs, watchccs_new)
52 || !BIO_meth_set_destroy(method_watchccs, watchccs_free))
53 return NULL;
54 }
55 return method_watchccs;
56 }
57
watchccs_new(BIO * bio)58 static int watchccs_new(BIO *bio)
59 {
60 BIO_set_init(bio, 1);
61 return 1;
62 }
63
watchccs_free(BIO * bio)64 static int watchccs_free(BIO *bio)
65 {
66 BIO_set_init(bio, 0);
67 return 1;
68 }
69
watchccs_read(BIO * bio,char * out,int outl)70 static int watchccs_read(BIO *bio, char *out, int outl)
71 {
72 int ret = 0;
73 BIO *next = BIO_next(bio);
74
75 if (outl <= 0)
76 return 0;
77 if (next == NULL)
78 return 0;
79
80 BIO_clear_retry_flags(bio);
81
82 ret = BIO_read(next, out, outl);
83 if (ret <= 0 && BIO_should_read(next))
84 BIO_set_retry_read(bio);
85
86 return ret;
87 }
88
watchccs_write(BIO * bio,const char * in,int inl)89 static int watchccs_write(BIO *bio, const char *in, int inl)
90 {
91 int ret = 0;
92 BIO *next = BIO_next(bio);
93 PACKET pkt, msg, msgbody, sessionid;
94 unsigned int rectype, recvers, msgtype, expectedrecvers;
95
96 if (inl <= 0)
97 return 0;
98 if (next == NULL)
99 return 0;
100
101 BIO_clear_retry_flags(bio);
102
103 if (!PACKET_buf_init(&pkt, (const unsigned char *)in, inl))
104 return 0;
105
106 /* We assume that we always write complete records each time */
107 while (PACKET_remaining(&pkt)) {
108 if (!PACKET_get_1(&pkt, &rectype)
109 || !PACKET_get_net_2(&pkt, &recvers)
110 || !PACKET_get_length_prefixed_2(&pkt, &msg))
111 return 0;
112
113 expectedrecvers = TLS1_2_VERSION;
114
115 if (rectype == SSL3_RT_HANDSHAKE) {
116 if (!PACKET_get_1(&msg, &msgtype)
117 || !PACKET_get_length_prefixed_3(&msg, &msgbody))
118 return 0;
119 if (msgtype == SSL3_MT_CLIENT_HELLO) {
120 chseen++;
121
122 /*
123 * Skip legacy_version (2 bytes) and Random (32 bytes) to read
124 * session_id.
125 */
126 if (!PACKET_forward(&msgbody, 34)
127 || !PACKET_get_length_prefixed_1(&msgbody, &sessionid))
128 return 0;
129
130 if (chseen == 1) {
131 expectedrecvers = TLS1_VERSION;
132
133 /* Save the session id for later */
134 chsessidlen = PACKET_remaining(&sessionid);
135 if (!PACKET_copy_bytes(&sessionid, chsessid, chsessidlen))
136 return 0;
137 } else {
138 /*
139 * Check the session id for the second ClientHello is the
140 * same as the first one.
141 */
142 if (PACKET_remaining(&sessionid) != chsessidlen
143 || (chsessidlen > 0
144 && memcmp(chsessid, PACKET_data(&sessionid),
145 chsessidlen) != 0))
146 badsessid = 1;
147 }
148 } else if (msgtype == SSL3_MT_SERVER_HELLO) {
149 shseen++;
150 /*
151 * Skip legacy_version (2 bytes) and Random (32 bytes) to read
152 * session_id.
153 */
154 if (!PACKET_forward(&msgbody, 34)
155 || !PACKET_get_length_prefixed_1(&msgbody, &sessionid))
156 return 0;
157
158 /*
159 * Check the session id is the same as the one in the
160 * ClientHello
161 */
162 if (PACKET_remaining(&sessionid) != chsessidlen
163 || (chsessidlen > 0
164 && memcmp(chsessid, PACKET_data(&sessionid),
165 chsessidlen) != 0))
166 badsessid = 1;
167 }
168 } else if (rectype == SSL3_RT_CHANGE_CIPHER_SPEC) {
169 if (bio == s_to_c_fbio) {
170 /*
171 * Server writing. We shouldn't have written any app data
172 * yet, and we should have seen both the ClientHello and the
173 * ServerHello
174 */
175 if (!sappdataseen
176 && chseen == 1
177 && shseen == 1
178 && !sccsseen)
179 sccsseen = 1;
180 else
181 badccs = 1;
182 } else if (!cappdataseen) {
183 /*
184 * Client writing. We shouldn't have written any app data
185 * yet, and we should have seen the ClientHello
186 */
187 if (shseen == 1 && !ccsaftersh)
188 ccsaftersh = 1;
189 else if (shseen == 0 && !ccsbeforesh)
190 ccsbeforesh = 1;
191 else
192 badccs = 1;
193 } else {
194 badccs = 1;
195 }
196 } else if(rectype == SSL3_RT_APPLICATION_DATA) {
197 if (bio == s_to_c_fbio)
198 sappdataseen = 1;
199 else
200 cappdataseen = 1;
201 }
202 if (recvers != expectedrecvers)
203 badvers = 1;
204 }
205
206 ret = BIO_write(next, in, inl);
207 if (ret <= 0 && BIO_should_write(next))
208 BIO_set_retry_write(bio);
209
210 return ret;
211 }
212
watchccs_ctrl(BIO * bio,int cmd,long num,void * ptr)213 static long watchccs_ctrl(BIO *bio, int cmd, long num, void *ptr)
214 {
215 long ret;
216 BIO *next = BIO_next(bio);
217
218 if (next == NULL)
219 return 0;
220
221 switch (cmd) {
222 case BIO_CTRL_DUP:
223 ret = 0;
224 break;
225 default:
226 ret = BIO_ctrl(next, cmd, num, ptr);
227 break;
228 }
229 return ret;
230 }
231
watchccs_gets(BIO * bio,char * buf,int size)232 static int watchccs_gets(BIO *bio, char *buf, int size)
233 {
234 /* We don't support this - not needed anyway */
235 return -1;
236 }
237
watchccs_puts(BIO * bio,const char * str)238 static int watchccs_puts(BIO *bio, const char *str)
239 {
240 return watchccs_write(bio, str, strlen(str));
241 }
242
test_tls13ccs(int tst)243 static int test_tls13ccs(int tst)
244 {
245 SSL_CTX *sctx = NULL, *cctx = NULL;
246 SSL *sssl = NULL, *cssl = NULL;
247 int ret = 0;
248 const char msg[] = "Dummy data";
249 char buf[80];
250 size_t written, readbytes;
251 SSL_SESSION *sess = NULL;
252
253 chseen = shseen = sccsseen = ccsaftersh = ccsbeforesh = 0;
254 sappdataseen = cappdataseen = badccs = badvers = badsessid = 0;
255 chsessidlen = 0;
256
257 if (!TEST_true(create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(),
258 TLS1_VERSION, TLS_MAX_VERSION,
259 &sctx, &cctx, cert, privkey))
260 || !TEST_true(SSL_CTX_set_max_early_data(sctx,
261 SSL3_RT_MAX_PLAIN_LENGTH)))
262 goto err;
263
264 /*
265 * Test 0: Simple Handshake
266 * Test 1: Simple Handshake, client middlebox compat mode disabled
267 * Test 2: Simple Handshake, server middlebox compat mode disabled
268 * Test 3: HRR Handshake
269 * Test 4: HRR Handshake, client middlebox compat mode disabled
270 * Test 5: HRR Handshake, server middlebox compat mode disabled
271 * Test 6: Early data handshake
272 * Test 7: Early data handshake, client middlebox compat mode disabled
273 * Test 8: Early data handshake, server middlebox compat mode disabled
274 * Test 9: Early data then HRR
275 * Test 10: Early data then HRR, client middlebox compat mode disabled
276 * Test 11: Early data then HRR, server middlebox compat mode disabled
277 */
278 switch (tst) {
279 case 0:
280 case 3:
281 case 6:
282 case 9:
283 break;
284 case 1:
285 case 4:
286 case 7:
287 case 10:
288 SSL_CTX_clear_options(cctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
289 break;
290 case 2:
291 case 5:
292 case 8:
293 case 11:
294 SSL_CTX_clear_options(sctx, SSL_OP_ENABLE_MIDDLEBOX_COMPAT);
295 break;
296 default:
297 TEST_error("Invalid test value");
298 goto err;
299 }
300
301 if (tst >= 6) {
302 /* Get a session suitable for early_data */
303 if (!TEST_true(create_ssl_objects(sctx, cctx, &sssl, &cssl, NULL, NULL))
304 || !TEST_true(create_ssl_connection(sssl, cssl, SSL_ERROR_NONE)))
305 goto err;
306 sess = SSL_get1_session(cssl);
307 if (!TEST_ptr(sess))
308 goto err;
309 SSL_shutdown(cssl);
310 SSL_shutdown(sssl);
311 SSL_free(sssl);
312 SSL_free(cssl);
313 sssl = cssl = NULL;
314 }
315
316 if ((tst >= 3 && tst <= 5) || tst >= 9) {
317 /* HRR handshake */
318 if (!TEST_true(SSL_CTX_set1_groups_list(sctx, "P-256")))
319 goto err;
320 }
321
322 s_to_c_fbio = BIO_new(bio_f_watchccs_filter());
323 c_to_s_fbio = BIO_new(bio_f_watchccs_filter());
324 if (!TEST_ptr(s_to_c_fbio)
325 || !TEST_ptr(c_to_s_fbio)) {
326 BIO_free(s_to_c_fbio);
327 BIO_free(c_to_s_fbio);
328 goto err;
329 }
330
331 /* BIOs get freed on error */
332 if (!TEST_true(create_ssl_objects(sctx, cctx, &sssl, &cssl, s_to_c_fbio,
333 c_to_s_fbio)))
334 goto err;
335
336 if (tst >= 6) {
337 /* Early data */
338 if (!TEST_true(SSL_set_session(cssl, sess))
339 || !TEST_true(SSL_write_early_data(cssl, msg, strlen(msg),
340 &written))
341 || (tst <= 8
342 && !TEST_int_eq(SSL_read_early_data(sssl, buf, sizeof(buf),
343 &readbytes),
344 SSL_READ_EARLY_DATA_SUCCESS)))
345 goto err;
346 if (tst <= 8) {
347 if (!TEST_int_gt(SSL_connect(cssl), 0))
348 goto err;
349 } else {
350 if (!TEST_int_le(SSL_connect(cssl), 0))
351 goto err;
352 }
353 if (!TEST_int_eq(SSL_read_early_data(sssl, buf, sizeof(buf),
354 &readbytes),
355 SSL_READ_EARLY_DATA_FINISH))
356 goto err;
357 }
358
359 /* Perform handshake (or complete it if doing early data ) */
360 if (!TEST_true(create_ssl_connection(sssl, cssl, SSL_ERROR_NONE)))
361 goto err;
362
363 /*
364 * Check there were no unexpected CCS messages, all record versions
365 * were as expected, and that the session ids were reflected by the server
366 * correctly.
367 */
368 if (!TEST_false(badccs) || !TEST_false(badvers) || !TEST_false(badsessid))
369 goto err;
370
371 switch (tst) {
372 case 0:
373 if (!TEST_true(sccsseen)
374 || !TEST_true(ccsaftersh)
375 || !TEST_false(ccsbeforesh)
376 || !TEST_size_t_gt(chsessidlen, 0))
377 goto err;
378 break;
379
380 case 1:
381 if (!TEST_true(sccsseen)
382 || !TEST_false(ccsaftersh)
383 || !TEST_false(ccsbeforesh)
384 || !TEST_size_t_eq(chsessidlen, 0))
385 goto err;
386 break;
387
388 case 2:
389 if (!TEST_false(sccsseen)
390 || !TEST_true(ccsaftersh)
391 || !TEST_false(ccsbeforesh)
392 || !TEST_size_t_gt(chsessidlen, 0))
393 goto err;
394 break;
395
396 case 3:
397 if (!TEST_true(sccsseen)
398 || !TEST_true(ccsaftersh)
399 || !TEST_false(ccsbeforesh)
400 || !TEST_size_t_gt(chsessidlen, 0))
401 goto err;
402 break;
403
404 case 4:
405 if (!TEST_true(sccsseen)
406 || !TEST_false(ccsaftersh)
407 || !TEST_false(ccsbeforesh)
408 || !TEST_size_t_eq(chsessidlen, 0))
409 goto err;
410 break;
411
412 case 5:
413 if (!TEST_false(sccsseen)
414 || !TEST_true(ccsaftersh)
415 || !TEST_false(ccsbeforesh)
416 || !TEST_size_t_gt(chsessidlen, 0))
417 goto err;
418 break;
419
420 case 6:
421 if (!TEST_true(sccsseen)
422 || !TEST_false(ccsaftersh)
423 || !TEST_true(ccsbeforesh)
424 || !TEST_size_t_gt(chsessidlen, 0))
425 goto err;
426 break;
427
428 case 7:
429 if (!TEST_true(sccsseen)
430 || !TEST_false(ccsaftersh)
431 || !TEST_false(ccsbeforesh)
432 || !TEST_size_t_eq(chsessidlen, 0))
433 goto err;
434 break;
435
436 case 8:
437 if (!TEST_false(sccsseen)
438 || !TEST_false(ccsaftersh)
439 || !TEST_true(ccsbeforesh)
440 || !TEST_size_t_gt(chsessidlen, 0))
441 goto err;
442 break;
443
444 case 9:
445 if (!TEST_true(sccsseen)
446 || !TEST_false(ccsaftersh)
447 || !TEST_true(ccsbeforesh)
448 || !TEST_size_t_gt(chsessidlen, 0))
449 goto err;
450 break;
451
452 case 10:
453 if (!TEST_true(sccsseen)
454 || !TEST_false(ccsaftersh)
455 || !TEST_false(ccsbeforesh)
456 || !TEST_size_t_eq(chsessidlen, 0))
457 goto err;
458 break;
459
460 case 11:
461 if (!TEST_false(sccsseen)
462 || !TEST_false(ccsaftersh)
463 || !TEST_true(ccsbeforesh)
464 || !TEST_size_t_gt(chsessidlen, 0))
465 goto err;
466 break;
467
468 default:
469 TEST_error("Invalid test value");
470 goto err;
471 }
472
473 ret = 1;
474 err:
475 SSL_SESSION_free(sess);
476 SSL_free(sssl);
477 SSL_free(cssl);
478 SSL_CTX_free(sctx);
479 SSL_CTX_free(cctx);
480
481 return ret;
482 }
483
setup_tests(void)484 int setup_tests(void)
485 {
486 if (!TEST_ptr(cert = test_get_argument(0))
487 || !TEST_ptr(privkey = test_get_argument(1)))
488 return 0;
489
490 ADD_ALL_TESTS(test_tls13ccs, 12);
491
492 return 1;
493 }
494
cleanup_tests(void)495 void cleanup_tests(void)
496 {
497 BIO_meth_free(method_watchccs);
498 }
499