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
16static char *cert = NULL;
17static char *privkey = NULL;
18
19static BIO *s_to_c_fbio = NULL, *c_to_s_fbio = NULL;
20static int chseen = 0, shseen = 0, sccsseen = 0, ccsaftersh = 0;
21static int ccsbeforesh = 0, sappdataseen = 0, cappdataseen = 0, badccs = 0;
22static int badvers = 0, badsessid = 0;
23
24static unsigned char chsessid[SSL_MAX_SSL_SESSION_ID_LENGTH];
25static size_t chsessidlen = 0;
26
27static int watchccs_new(BIO *bi);
28static int watchccs_free(BIO *a);
29static int watchccs_read(BIO *b, char *out, int outl);
30static int watchccs_write(BIO *b, const char *in, int inl);
31static long watchccs_ctrl(BIO *b, int cmd, long num, void *ptr);
32static int watchccs_gets(BIO *bp, char *buf, int size);
33static 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
38static BIO_METHOD *method_watchccs = NULL;
39
40static 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
58static int watchccs_new(BIO *bio)
59{
60    BIO_set_init(bio, 1);
61    return 1;
62}
63
64static int watchccs_free(BIO *bio)
65{
66    BIO_set_init(bio, 0);
67    return 1;
68}
69
70static 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
89static 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
213static 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
232static int watchccs_gets(BIO *bio, char *buf, int size)
233{
234    /* We don't support this - not needed anyway */
235    return -1;
236}
237
238static int watchccs_puts(BIO *bio, const char *str)
239{
240    return watchccs_write(bio, str, strlen(str));
241}
242
243static 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
484int 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
495void cleanup_tests(void)
496{
497    BIO_meth_free(method_watchccs);
498}
499