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Commit | Line | Data |
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846e33c7 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
258f8721 | 3 | * |
846e33c7 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 | |
7 | * https://www.openssl.org/source/license.html | |
258f8721 MC |
8 | */ |
9 | ||
10 | #include "../ssl_locl.h" | |
68570797 | 11 | #include "internal/constant_time_locl.h" |
02a36fda | 12 | #include <openssl/rand.h> |
c99c4c11 | 13 | #include "record_locl.h" |
67dc995e | 14 | #include "internal/cryptlib.h" |
02a36fda MC |
15 | |
16 | static const unsigned char ssl3_pad_1[48] = { | |
17 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, | |
18 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, | |
19 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, | |
20 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, | |
21 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, | |
22 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36 | |
23 | }; | |
24 | ||
25 | static const unsigned char ssl3_pad_2[48] = { | |
26 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, | |
27 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, | |
28 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, | |
29 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, | |
30 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, | |
31 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c | |
32 | }; | |
258f8721 | 33 | |
6b41b3f5 MC |
34 | /* |
35 | * Clear the contents of an SSL3_RECORD but retain any memory allocated | |
36 | */ | |
5607b275 | 37 | void SSL3_RECORD_clear(SSL3_RECORD *r, size_t num_recs) |
258f8721 | 38 | { |
94777c9c | 39 | unsigned char *comp; |
5607b275 | 40 | size_t i; |
6b41b3f5 | 41 | |
94777c9c MC |
42 | for (i = 0; i < num_recs; i++) { |
43 | comp = r[i].comp; | |
44 | ||
45 | memset(&r[i], 0, sizeof(*r)); | |
46 | r[i].comp = comp; | |
47 | } | |
258f8721 MC |
48 | } |
49 | ||
5607b275 | 50 | void SSL3_RECORD_release(SSL3_RECORD *r, size_t num_recs) |
258f8721 | 51 | { |
5607b275 | 52 | size_t i; |
94777c9c MC |
53 | |
54 | for (i = 0; i < num_recs; i++) { | |
55 | OPENSSL_free(r[i].comp); | |
56 | r[i].comp = NULL; | |
57 | } | |
258f8721 MC |
58 | } |
59 | ||
258f8721 MC |
60 | void SSL3_RECORD_set_seq_num(SSL3_RECORD *r, const unsigned char *seq_num) |
61 | { | |
e5bf62f7 | 62 | memcpy(r->seq_num, seq_num, SEQ_NUM_SIZE); |
258f8721 | 63 | } |
fe589e61 | 64 | |
94777c9c MC |
65 | /* |
66 | * Peeks ahead into "read_ahead" data to see if we have a whole record waiting | |
67 | * for us in the buffer. | |
68 | */ | |
ea71906e | 69 | static int ssl3_record_app_data_waiting(SSL *s) |
94777c9c MC |
70 | { |
71 | SSL3_BUFFER *rbuf; | |
8e6d03ca | 72 | size_t left, len; |
94777c9c MC |
73 | unsigned char *p; |
74 | ||
75 | rbuf = RECORD_LAYER_get_rbuf(&s->rlayer); | |
76 | ||
77 | p = SSL3_BUFFER_get_buf(rbuf); | |
78 | if (p == NULL) | |
79 | return 0; | |
80 | ||
81 | left = SSL3_BUFFER_get_left(rbuf); | |
82 | ||
83 | if (left < SSL3_RT_HEADER_LENGTH) | |
84 | return 0; | |
85 | ||
86 | p += SSL3_BUFFER_get_offset(rbuf); | |
87 | ||
88 | /* | |
89 | * We only check the type and record length, we will sanity check version | |
90 | * etc later | |
91 | */ | |
92 | if (*p != SSL3_RT_APPLICATION_DATA) | |
93 | return 0; | |
94 | ||
95 | p += 3; | |
96 | n2s(p, len); | |
97 | ||
98 | if (left < SSL3_RT_HEADER_LENGTH + len) | |
99 | return 0; | |
100 | ||
101 | return 1; | |
102 | } | |
103 | ||
a832b5ef | 104 | int early_data_count_ok(SSL *s, size_t length, size_t overhead, int *al) |
70ef40a0 MC |
105 | { |
106 | uint32_t max_early_data = s->max_early_data; | |
107 | ||
108 | /* | |
7daf7156 MC |
109 | * If we are a client then we always use the max_early_data from the |
110 | * session. Otherwise we go with the lowest out of the max early data set in | |
111 | * the session and the configured max_early_data. | |
70ef40a0 | 112 | */ |
7daf7156 MC |
113 | if (!s->server || (s->hit |
114 | && s->session->ext.max_early_data < s->max_early_data)) | |
a832b5ef | 115 | max_early_data = s->session->ext.max_early_data; |
70ef40a0 MC |
116 | |
117 | if (max_early_data == 0) { | |
7daf7156 MC |
118 | if (al != NULL) |
119 | *al = SSL_AD_UNEXPECTED_MESSAGE; | |
70ef40a0 MC |
120 | SSLerr(SSL_F_EARLY_DATA_COUNT_OK, SSL_R_TOO_MUCH_EARLY_DATA); |
121 | return 0; | |
122 | } | |
123 | ||
124 | /* If we are dealing with ciphertext we need to allow for the overhead */ | |
125 | max_early_data += overhead; | |
126 | ||
7daf7156 MC |
127 | if (s->early_data_count + length > max_early_data) { |
128 | if (al != NULL) | |
129 | *al = SSL_AD_UNEXPECTED_MESSAGE; | |
70ef40a0 MC |
130 | SSLerr(SSL_F_EARLY_DATA_COUNT_OK, SSL_R_TOO_MUCH_EARLY_DATA); |
131 | return 0; | |
132 | } | |
7daf7156 | 133 | s->early_data_count += length; |
70ef40a0 MC |
134 | |
135 | return 1; | |
136 | } | |
137 | ||
fe589e61 MC |
138 | /* |
139 | * MAX_EMPTY_RECORDS defines the number of consecutive, empty records that | |
140 | * will be processed per call to ssl3_get_record. Without this limit an | |
141 | * attacker could send empty records at a faster rate than we can process and | |
142 | * cause ssl3_get_record to loop forever. | |
143 | */ | |
144 | #define MAX_EMPTY_RECORDS 32 | |
145 | ||
32ec4153 | 146 | #define SSL2_RT_HEADER_LENGTH 2 |
fe589e61 | 147 | /*- |
94777c9c | 148 | * Call this to get new input records. |
fe589e61 MC |
149 | * It will return <= 0 if more data is needed, normally due to an error |
150 | * or non-blocking IO. | |
94777c9c MC |
151 | * When it finishes, |numrpipes| records have been decoded. For each record 'i': |
152 | * rr[i].type - is the type of record | |
153 | * rr[i].data, - data | |
154 | * rr[i].length, - number of bytes | |
155 | * Multiple records will only be returned if the record types are all | |
156 | * SSL3_RT_APPLICATION_DATA. The number of records returned will always be <= | |
157 | * |max_pipelines| | |
fe589e61 MC |
158 | */ |
159 | /* used only by ssl3_read_bytes */ | |
160 | int ssl3_get_record(SSL *s) | |
161 | { | |
6a149cee | 162 | int al; |
8e6d03ca MC |
163 | int enc_err, rret, ret = -1; |
164 | int i; | |
165 | size_t more, n; | |
88858868 | 166 | SSL3_RECORD *rr, *thisrr; |
94777c9c | 167 | SSL3_BUFFER *rbuf; |
fe589e61 MC |
168 | SSL_SESSION *sess; |
169 | unsigned char *p; | |
170 | unsigned char md[EVP_MAX_MD_SIZE]; | |
6a149cee | 171 | unsigned int version; |
72716e79 MC |
172 | size_t mac_size; |
173 | int imac_size; | |
174 | size_t num_recs = 0, max_recs, j; | |
6a149cee | 175 | PACKET pkt, sslv2pkt; |
70ef40a0 | 176 | size_t first_rec_len; |
fe589e61 MC |
177 | |
178 | rr = RECORD_LAYER_get_rrec(&s->rlayer); | |
94777c9c MC |
179 | rbuf = RECORD_LAYER_get_rbuf(&s->rlayer); |
180 | max_recs = s->max_pipelines; | |
181 | if (max_recs == 0) | |
182 | max_recs = 1; | |
fe589e61 MC |
183 | sess = s->session; |
184 | ||
94777c9c | 185 | do { |
88858868 MC |
186 | thisrr = &rr[num_recs]; |
187 | ||
94777c9c MC |
188 | /* check if we have the header */ |
189 | if ((RECORD_LAYER_get_rstate(&s->rlayer) != SSL_ST_READ_BODY) || | |
190 | (RECORD_LAYER_get_packet_length(&s->rlayer) | |
191 | < SSL3_RT_HEADER_LENGTH)) { | |
6a149cee MC |
192 | size_t sslv2len; |
193 | unsigned int type; | |
194 | ||
8e6d03ca MC |
195 | rret = ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, |
196 | SSL3_BUFFER_get_len(rbuf), 0, | |
197 | num_recs == 0 ? 1 : 0, &n); | |
198 | if (rret <= 0) | |
199 | return rret; /* error or non-blocking */ | |
94777c9c MC |
200 | RECORD_LAYER_set_rstate(&s->rlayer, SSL_ST_READ_BODY); |
201 | ||
202 | p = RECORD_LAYER_get_packet(&s->rlayer); | |
6a149cee MC |
203 | if (!PACKET_buf_init(&pkt, RECORD_LAYER_get_packet(&s->rlayer), |
204 | RECORD_LAYER_get_packet_length(&s->rlayer))) { | |
205 | al = SSL_AD_INTERNAL_ERROR; | |
206 | SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR); | |
207 | goto f_err; | |
208 | } | |
209 | sslv2pkt = pkt; | |
210 | if (!PACKET_get_net_2_len(&sslv2pkt, &sslv2len) | |
211 | || !PACKET_get_1(&sslv2pkt, &type)) { | |
fb34a0f4 | 212 | al = SSL_AD_DECODE_ERROR; |
6a149cee MC |
213 | SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR); |
214 | goto f_err; | |
215 | } | |
94777c9c | 216 | /* |
78fcddbb | 217 | * The first record received by the server may be a V2ClientHello. |
94777c9c | 218 | */ |
78fcddbb | 219 | if (s->server && RECORD_LAYER_is_first_record(&s->rlayer) |
6a149cee MC |
220 | && (sslv2len & 0x8000) != 0 |
221 | && (type == SSL2_MT_CLIENT_HELLO)) { | |
be9c8deb MC |
222 | /* |
223 | * SSLv2 style record | |
224 | * | |
225 | * |num_recs| here will actually always be 0 because | |
226 | * |num_recs > 0| only ever occurs when we are processing | |
227 | * multiple app data records - which we know isn't the case here | |
228 | * because it is an SSLv2ClientHello. We keep it using | |
229 | * |num_recs| for the sake of consistency | |
230 | */ | |
88858868 MC |
231 | thisrr->type = SSL3_RT_HANDSHAKE; |
232 | thisrr->rec_version = SSL2_VERSION; | |
94777c9c | 233 | |
88858868 | 234 | thisrr->length = sslv2len & 0x7fff; |
94777c9c | 235 | |
88858868 | 236 | if (thisrr->length > SSL3_BUFFER_get_len(rbuf) |
a230b26e | 237 | - SSL2_RT_HEADER_LENGTH) { |
94777c9c MC |
238 | al = SSL_AD_RECORD_OVERFLOW; |
239 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_PACKET_LENGTH_TOO_LONG); | |
240 | goto f_err; | |
241 | } | |
fe589e61 | 242 | |
88858868 | 243 | if (thisrr->length < MIN_SSL2_RECORD_LEN) { |
fb34a0f4 | 244 | al = SSL_AD_DECODE_ERROR; |
94777c9c MC |
245 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT); |
246 | goto f_err; | |
247 | } | |
248 | } else { | |
249 | /* SSLv3+ style record */ | |
250 | if (s->msg_callback) | |
251 | s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s, | |
252 | s->msg_callback_arg); | |
253 | ||
254 | /* Pull apart the header into the SSL3_RECORD */ | |
6a149cee MC |
255 | if (!PACKET_get_1(&pkt, &type) |
256 | || !PACKET_get_net_2(&pkt, &version) | |
88858868 | 257 | || !PACKET_get_net_2_len(&pkt, &thisrr->length)) { |
fb34a0f4 | 258 | al = SSL_AD_DECODE_ERROR; |
6a149cee MC |
259 | SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR); |
260 | goto f_err; | |
261 | } | |
88858868 MC |
262 | thisrr->type = type; |
263 | thisrr->rec_version = version; | |
94777c9c | 264 | |
3c9539d2 | 265 | /* Lets check version. In TLSv1.3 we ignore this field */ |
657a43f6 | 266 | if (!s->first_packet && !SSL_IS_TLS13(s) |
6a149cee | 267 | && version != (unsigned int)s->version) { |
94777c9c MC |
268 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER); |
269 | if ((s->version & 0xFF00) == (version & 0xFF00) | |
270 | && !s->enc_write_ctx && !s->write_hash) { | |
88858868 | 271 | if (thisrr->type == SSL3_RT_ALERT) { |
94777c9c MC |
272 | /* |
273 | * The record is using an incorrect version number, | |
274 | * but what we've got appears to be an alert. We | |
275 | * haven't read the body yet to check whether its a | |
276 | * fatal or not - but chances are it is. We probably | |
277 | * shouldn't send a fatal alert back. We'll just | |
278 | * end. | |
279 | */ | |
a230b26e | 280 | goto err; |
94777c9c | 281 | } |
02db21df | 282 | /* |
94777c9c | 283 | * Send back error using their minor version number :-) |
02db21df | 284 | */ |
94777c9c | 285 | s->version = (unsigned short)version; |
02db21df | 286 | } |
94777c9c MC |
287 | al = SSL_AD_PROTOCOL_VERSION; |
288 | goto f_err; | |
02db21df | 289 | } |
32ec4153 | 290 | |
94777c9c | 291 | if ((version >> 8) != SSL3_VERSION_MAJOR) { |
a01c86a2 | 292 | if (RECORD_LAYER_is_first_record(&s->rlayer)) { |
94777c9c MC |
293 | /* Go back to start of packet, look at the five bytes |
294 | * that we have. */ | |
295 | p = RECORD_LAYER_get_packet(&s->rlayer); | |
296 | if (strncmp((char *)p, "GET ", 4) == 0 || | |
297 | strncmp((char *)p, "POST ", 5) == 0 || | |
298 | strncmp((char *)p, "HEAD ", 5) == 0 || | |
299 | strncmp((char *)p, "PUT ", 4) == 0) { | |
300 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_HTTP_REQUEST); | |
301 | goto err; | |
302 | } else if (strncmp((char *)p, "CONNE", 5) == 0) { | |
303 | SSLerr(SSL_F_SSL3_GET_RECORD, | |
304 | SSL_R_HTTPS_PROXY_REQUEST); | |
305 | goto err; | |
306 | } | |
a01c86a2 MC |
307 | |
308 | /* Doesn't look like TLS - don't send an alert */ | |
309 | SSLerr(SSL_F_SSL3_GET_RECORD, | |
310 | SSL_R_WRONG_VERSION_NUMBER); | |
311 | goto err; | |
312 | } else { | |
313 | SSLerr(SSL_F_SSL3_GET_RECORD, | |
314 | SSL_R_WRONG_VERSION_NUMBER); | |
315 | al = SSL_AD_PROTOCOL_VERSION; | |
316 | goto f_err; | |
124f6ff4 RJ |
317 | } |
318 | } | |
32ec4153 | 319 | |
e60ce9c4 | 320 | if (SSL_IS_TLS13(s) && s->enc_read_ctx != NULL |
88858868 | 321 | && thisrr->type != SSL3_RT_APPLICATION_DATA) { |
e60ce9c4 MC |
322 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_RECORD_TYPE); |
323 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
324 | goto f_err; | |
325 | } | |
326 | ||
88858868 | 327 | if (thisrr->length > |
a230b26e | 328 | SSL3_BUFFER_get_len(rbuf) - SSL3_RT_HEADER_LENGTH) { |
94777c9c MC |
329 | al = SSL_AD_RECORD_OVERFLOW; |
330 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_PACKET_LENGTH_TOO_LONG); | |
331 | goto f_err; | |
332 | } | |
32ec4153 | 333 | } |
94777c9c MC |
334 | |
335 | /* now s->rlayer.rstate == SSL_ST_READ_BODY */ | |
fe589e61 MC |
336 | } |
337 | ||
43219695 MC |
338 | if (SSL_IS_TLS13(s)) { |
339 | if (thisrr->length > SSL3_RT_MAX_TLS13_ENCRYPTED_LENGTH) { | |
340 | al = SSL_AD_RECORD_OVERFLOW; | |
341 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_ENCRYPTED_LENGTH_TOO_LONG); | |
342 | goto f_err; | |
343 | } | |
344 | } else { | |
345 | size_t len = SSL3_RT_MAX_ENCRYPTED_LENGTH; | |
346 | ||
4f7b76bf MC |
347 | #ifndef OPENSSL_NO_COMP |
348 | /* | |
349 | * If OPENSSL_NO_COMP is defined then SSL3_RT_MAX_ENCRYPTED_LENGTH | |
350 | * does not include the compression overhead anyway. | |
351 | */ | |
43219695 MC |
352 | if (s->expand == NULL) |
353 | len -= SSL3_RT_MAX_COMPRESSED_OVERHEAD; | |
4f7b76bf | 354 | #endif |
43219695 MC |
355 | |
356 | if (thisrr->length > len) { | |
357 | al = SSL_AD_RECORD_OVERFLOW; | |
358 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_ENCRYPTED_LENGTH_TOO_LONG); | |
359 | goto f_err; | |
360 | } | |
361 | } | |
362 | ||
94777c9c MC |
363 | /* |
364 | * s->rlayer.rstate == SSL_ST_READ_BODY, get and decode the data. | |
365 | * Calculate how much more data we need to read for the rest of the | |
366 | * record | |
367 | */ | |
88858868 MC |
368 | if (thisrr->rec_version == SSL2_VERSION) { |
369 | more = thisrr->length + SSL2_RT_HEADER_LENGTH | |
94777c9c MC |
370 | - SSL3_RT_HEADER_LENGTH; |
371 | } else { | |
88858868 | 372 | more = thisrr->length; |
94777c9c | 373 | } |
8e6d03ca | 374 | if (more > 0) { |
94777c9c | 375 | /* now s->packet_length == SSL3_RT_HEADER_LENGTH */ |
fe589e61 | 376 | |
8e6d03ca MC |
377 | rret = ssl3_read_n(s, more, more, 1, 0, &n); |
378 | if (rret <= 0) | |
379 | return rret; /* error or non-blocking io */ | |
94777c9c | 380 | } |
32ec4153 | 381 | |
94777c9c MC |
382 | /* set state for later operations */ |
383 | RECORD_LAYER_set_rstate(&s->rlayer, SSL_ST_READ_HEADER); | |
fe589e61 | 384 | |
94777c9c | 385 | /* |
88858868 MC |
386 | * At this point, s->packet_length == SSL3_RT_HEADER_LENGTH |
387 | * + thisrr->length, or s->packet_length == SSL2_RT_HEADER_LENGTH | |
388 | * + thisrr->length and we have that many bytes in s->packet | |
94777c9c | 389 | */ |
88858868 MC |
390 | if (thisrr->rec_version == SSL2_VERSION) { |
391 | thisrr->input = | |
94777c9c MC |
392 | &(RECORD_LAYER_get_packet(&s->rlayer)[SSL2_RT_HEADER_LENGTH]); |
393 | } else { | |
88858868 | 394 | thisrr->input = |
94777c9c MC |
395 | &(RECORD_LAYER_get_packet(&s->rlayer)[SSL3_RT_HEADER_LENGTH]); |
396 | } | |
fe589e61 | 397 | |
94777c9c | 398 | /* |
88858868 MC |
399 | * ok, we can now read from 's->packet' data into 'thisrr' thisrr->input |
400 | * points at thisrr->length bytes, which need to be copied into | |
401 | * thisrr->data by either the decryption or by the decompression When | |
402 | * the data is 'copied' into the thisrr->data buffer, thisrr->input will | |
403 | * be pointed at the new buffer | |
94777c9c | 404 | */ |
fe589e61 | 405 | |
94777c9c | 406 | /* |
88858868 MC |
407 | * We now have - encrypted [ MAC [ compressed [ plain ] ] ] |
408 | * thisrr->length bytes of encrypted compressed stuff. | |
94777c9c | 409 | */ |
fe589e61 | 410 | |
88858868 MC |
411 | /* decrypt in place in 'thisrr->input' */ |
412 | thisrr->data = thisrr->input; | |
413 | thisrr->orig_len = thisrr->length; | |
255cfeac MC |
414 | |
415 | /* Mark this record as not read by upper layers yet */ | |
88858868 | 416 | thisrr->read = 0; |
255cfeac | 417 | |
94777c9c MC |
418 | num_recs++; |
419 | ||
420 | /* we have pulled in a full packet so zero things */ | |
421 | RECORD_LAYER_reset_packet_length(&s->rlayer); | |
78fcddbb | 422 | RECORD_LAYER_clear_first_record(&s->rlayer); |
de0717eb | 423 | } while (num_recs < max_recs |
88858868 | 424 | && thisrr->type == SSL3_RT_APPLICATION_DATA |
94777c9c MC |
425 | && SSL_USE_EXPLICIT_IV(s) |
426 | && s->enc_read_ctx != NULL | |
427 | && (EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(s->enc_read_ctx)) | |
a230b26e | 428 | & EVP_CIPH_FLAG_PIPELINE) |
ea71906e | 429 | && ssl3_record_app_data_waiting(s)); |
fe589e61 | 430 | |
fe589e61 MC |
431 | /* |
432 | * If in encrypt-then-mac mode calculate mac from encrypted record. All | |
433 | * the details below are public so no timing details can leak. | |
434 | */ | |
28a31a0a | 435 | if (SSL_READ_ETM(s) && s->read_hash) { |
fe589e61 | 436 | unsigned char *mac; |
72716e79 MC |
437 | /* TODO(size_t): convert this to do size_t properly */ |
438 | imac_size = EVP_MD_CTX_size(s->read_hash); | |
b77f3ed1 | 439 | if (!ossl_assert(imac_size >= 0 && imac_size <= EVP_MAX_MD_SIZE)) { |
72716e79 MC |
440 | al = SSL_AD_INTERNAL_ERROR; |
441 | SSLerr(SSL_F_SSL3_GET_RECORD, ERR_LIB_EVP); | |
442 | goto f_err; | |
443 | } | |
444 | mac_size = (size_t)imac_size; | |
94777c9c | 445 | for (j = 0; j < num_recs; j++) { |
88858868 MC |
446 | thisrr = &rr[j]; |
447 | ||
448 | if (thisrr->length < mac_size) { | |
94777c9c MC |
449 | al = SSL_AD_DECODE_ERROR; |
450 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT); | |
451 | goto f_err; | |
452 | } | |
88858868 MC |
453 | thisrr->length -= mac_size; |
454 | mac = thisrr->data + thisrr->length; | |
455 | i = s->method->ssl3_enc->mac(s, thisrr, md, 0 /* not send */ ); | |
a14aa99b | 456 | if (i == 0 || CRYPTO_memcmp(md, mac, mac_size) != 0) { |
94777c9c MC |
457 | al = SSL_AD_BAD_RECORD_MAC; |
458 | SSLerr(SSL_F_SSL3_GET_RECORD, | |
459 | SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC); | |
460 | goto f_err; | |
461 | } | |
fe589e61 MC |
462 | } |
463 | } | |
464 | ||
70ef40a0 MC |
465 | first_rec_len = rr[0].length; |
466 | ||
94777c9c | 467 | enc_err = s->method->ssl3_enc->enc(s, rr, num_recs, 0); |
e60ce9c4 | 468 | |
fe589e61 MC |
469 | /*- |
470 | * enc_err is: | |
d781d247 | 471 | * 0: (in non-constant time) if the record is publicly invalid. |
fe589e61 MC |
472 | * 1: if the padding is valid |
473 | * -1: if the padding is invalid | |
474 | */ | |
475 | if (enc_err == 0) { | |
0a87d0ac MC |
476 | if (num_recs == 1 && ossl_statem_skip_early_data(s)) { |
477 | /* | |
d781d247 MC |
478 | * Valid early_data that we cannot decrypt might fail here as |
479 | * publicly invalid. We treat it like an empty record. | |
0a87d0ac | 480 | */ |
70ef40a0 | 481 | |
0a87d0ac | 482 | thisrr = &rr[0]; |
70ef40a0 MC |
483 | |
484 | if (!early_data_count_ok(s, thisrr->length, | |
485 | EARLY_DATA_CIPHERTEXT_OVERHEAD, &al)) | |
486 | goto f_err; | |
487 | ||
0a87d0ac MC |
488 | thisrr->length = 0; |
489 | thisrr->read = 1; | |
490 | RECORD_LAYER_set_numrpipes(&s->rlayer, 1); | |
67f78ead | 491 | RECORD_LAYER_reset_read_sequence(&s->rlayer); |
0a87d0ac MC |
492 | return 1; |
493 | } | |
fe589e61 MC |
494 | al = SSL_AD_DECRYPTION_FAILED; |
495 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); | |
496 | goto f_err; | |
497 | } | |
d63a5e5e | 498 | #ifdef SSL_DEBUG |
88858868 | 499 | printf("dec %"OSSLzu"\n", rr[0].length); |
fe589e61 | 500 | { |
eda75751 | 501 | size_t z; |
88858868 MC |
502 | for (z = 0; z < rr[0].length; z++) |
503 | printf("%02X%c", rr[0].data[z], ((z + 1) % 16) ? ' ' : '\n'); | |
fe589e61 MC |
504 | } |
505 | printf("\n"); | |
506 | #endif | |
507 | ||
508 | /* r->length is now the compressed data plus mac */ | |
509 | if ((sess != NULL) && | |
510 | (s->enc_read_ctx != NULL) && | |
28a31a0a | 511 | (!SSL_READ_ETM(s) && EVP_MD_CTX_md(s->read_hash) != NULL)) { |
fe589e61 MC |
512 | /* s->read_hash != NULL => mac_size != -1 */ |
513 | unsigned char *mac = NULL; | |
514 | unsigned char mac_tmp[EVP_MAX_MD_SIZE]; | |
94777c9c | 515 | |
fe589e61 | 516 | mac_size = EVP_MD_CTX_size(s->read_hash); |
380a522f MC |
517 | if (!ossl_assert(mac_size <= EVP_MAX_MD_SIZE)) { |
518 | al = SSL_AD_INTERNAL_ERROR; | |
519 | SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR); | |
520 | goto f_err; | |
521 | } | |
fe589e61 | 522 | |
a230b26e | 523 | for (j = 0; j < num_recs; j++) { |
88858868 | 524 | thisrr = &rr[j]; |
fe589e61 | 525 | /* |
94777c9c MC |
526 | * orig_len is the length of the record before any padding was |
527 | * removed. This is public information, as is the MAC in use, | |
528 | * therefore we can safely process the record in a different amount | |
529 | * of time if it's too short to possibly contain a MAC. | |
fe589e61 | 530 | */ |
88858868 | 531 | if (thisrr->orig_len < mac_size || |
94777c9c MC |
532 | /* CBC records must have a padding length byte too. */ |
533 | (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE && | |
88858868 | 534 | thisrr->orig_len < mac_size + 1)) { |
94777c9c MC |
535 | al = SSL_AD_DECODE_ERROR; |
536 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT); | |
537 | goto f_err; | |
538 | } | |
fe589e61 | 539 | |
94777c9c MC |
540 | if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE) { |
541 | /* | |
542 | * We update the length so that the TLS header bytes can be | |
543 | * constructed correctly but we need to extract the MAC in | |
544 | * constant time from within the record, without leaking the | |
545 | * contents of the padding bytes. | |
546 | */ | |
547 | mac = mac_tmp; | |
380a522f MC |
548 | if (!ssl3_cbc_copy_mac(mac_tmp, thisrr, mac_size)) { |
549 | al = SSL_AD_INTERNAL_ERROR; | |
550 | SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR); | |
551 | goto f_err; | |
552 | } | |
88858868 | 553 | thisrr->length -= mac_size; |
94777c9c MC |
554 | } else { |
555 | /* | |
556 | * In this case there's no padding, so |rec->orig_len| equals | |
557 | * |rec->length| and we checked that there's enough bytes for | |
558 | * |mac_size| above. | |
559 | */ | |
88858868 MC |
560 | thisrr->length -= mac_size; |
561 | mac = &thisrr->data[thisrr->length]; | |
94777c9c MC |
562 | } |
563 | ||
88858868 | 564 | i = s->method->ssl3_enc->mac(s, thisrr, md, 0 /* not send */ ); |
a14aa99b | 565 | if (i == 0 || mac == NULL |
94777c9c MC |
566 | || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0) |
567 | enc_err = -1; | |
88858868 | 568 | if (thisrr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + mac_size) |
94777c9c MC |
569 | enc_err = -1; |
570 | } | |
fe589e61 MC |
571 | } |
572 | ||
573 | if (enc_err < 0) { | |
d781d247 MC |
574 | if (num_recs == 1 && ossl_statem_skip_early_data(s)) { |
575 | /* | |
576 | * We assume this is unreadable early_data - we treat it like an | |
577 | * empty record | |
578 | */ | |
70ef40a0 MC |
579 | |
580 | /* | |
581 | * The record length may have been modified by the mac check above | |
582 | * so we use the previously saved value | |
583 | */ | |
584 | if (!early_data_count_ok(s, first_rec_len, | |
585 | EARLY_DATA_CIPHERTEXT_OVERHEAD, &al)) | |
586 | goto f_err; | |
587 | ||
d781d247 MC |
588 | thisrr = &rr[0]; |
589 | thisrr->length = 0; | |
590 | thisrr->read = 1; | |
591 | RECORD_LAYER_set_numrpipes(&s->rlayer, 1); | |
67f78ead | 592 | RECORD_LAYER_reset_read_sequence(&s->rlayer); |
d781d247 MC |
593 | return 1; |
594 | } | |
fe589e61 MC |
595 | /* |
596 | * A separate 'decryption_failed' alert was introduced with TLS 1.0, | |
597 | * SSL 3.0 only has 'bad_record_mac'. But unless a decryption | |
598 | * failure is directly visible from the ciphertext anyway, we should | |
599 | * not reveal which kind of error occurred -- this might become | |
600 | * visible to an attacker (e.g. via a logfile) | |
601 | */ | |
602 | al = SSL_AD_BAD_RECORD_MAC; | |
603 | SSLerr(SSL_F_SSL3_GET_RECORD, | |
604 | SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC); | |
605 | goto f_err; | |
606 | } | |
607 | ||
94777c9c | 608 | for (j = 0; j < num_recs; j++) { |
88858868 MC |
609 | thisrr = &rr[j]; |
610 | ||
611 | /* thisrr->length is now just compressed */ | |
94777c9c | 612 | if (s->expand != NULL) { |
88858868 | 613 | if (thisrr->length > SSL3_RT_MAX_COMPRESSED_LENGTH) { |
94777c9c MC |
614 | al = SSL_AD_RECORD_OVERFLOW; |
615 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_COMPRESSED_LENGTH_TOO_LONG); | |
616 | goto f_err; | |
617 | } | |
88858868 | 618 | if (!ssl3_do_uncompress(s, thisrr)) { |
94777c9c MC |
619 | al = SSL_AD_DECOMPRESSION_FAILURE; |
620 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_DECOMPRESSION); | |
621 | goto f_err; | |
622 | } | |
fe589e61 | 623 | } |
94777c9c | 624 | |
e60ce9c4 MC |
625 | if (SSL_IS_TLS13(s) && s->enc_read_ctx != NULL) { |
626 | size_t end; | |
627 | ||
3c544acc MC |
628 | if (thisrr->length == 0 |
629 | || thisrr->type != SSL3_RT_APPLICATION_DATA) { | |
e60ce9c4 MC |
630 | al = SSL_AD_UNEXPECTED_MESSAGE; |
631 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_RECORD_TYPE); | |
632 | goto f_err; | |
633 | } | |
634 | ||
635 | /* Strip trailing padding */ | |
88858868 MC |
636 | for (end = thisrr->length - 1; end > 0 && thisrr->data[end] == 0; |
637 | end--) | |
e60ce9c4 MC |
638 | continue; |
639 | ||
88858868 MC |
640 | thisrr->length = end; |
641 | thisrr->type = thisrr->data[end]; | |
642 | if (thisrr->type != SSL3_RT_APPLICATION_DATA | |
643 | && thisrr->type != SSL3_RT_ALERT | |
644 | && thisrr->type != SSL3_RT_HANDSHAKE) { | |
e60ce9c4 MC |
645 | al = SSL_AD_UNEXPECTED_MESSAGE; |
646 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_RECORD_TYPE); | |
647 | goto f_err; | |
648 | } | |
ad5100bc MC |
649 | if (s->msg_callback) |
650 | s->msg_callback(0, s->version, SSL3_RT_INNER_CONTENT_TYPE, | |
651 | &thisrr->data[end], 1, s, s->msg_callback_arg); | |
e60ce9c4 MC |
652 | } |
653 | ||
9010b7bc MC |
654 | /* |
655 | * TLSv1.3 alert and handshake records are required to be non-zero in | |
656 | * length. | |
657 | */ | |
fc4c15fa MC |
658 | if (SSL_IS_TLS13(s) |
659 | && (thisrr->type == SSL3_RT_HANDSHAKE | |
660 | || thisrr->type == SSL3_RT_ALERT) | |
661 | && thisrr->length == 0) { | |
662 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
663 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_LENGTH); | |
664 | goto f_err; | |
665 | } | |
666 | ||
88858868 | 667 | if (thisrr->length > SSL3_RT_MAX_PLAIN_LENGTH) { |
94777c9c MC |
668 | al = SSL_AD_RECORD_OVERFLOW; |
669 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_DATA_LENGTH_TOO_LONG); | |
fe589e61 MC |
670 | goto f_err; |
671 | } | |
fe589e61 | 672 | |
88858868 | 673 | thisrr->off = 0; |
94777c9c MC |
674 | /*- |
675 | * So at this point the following is true | |
88858868 MC |
676 | * thisrr->type is the type of record |
677 | * thisrr->length == number of bytes in record | |
678 | * thisrr->off == offset to first valid byte | |
679 | * thisrr->data == where to take bytes from, increment after use :-). | |
94777c9c | 680 | */ |
fe589e61 | 681 | |
94777c9c | 682 | /* just read a 0 length packet */ |
88858868 | 683 | if (thisrr->length == 0) { |
255cfeac MC |
684 | RECORD_LAYER_inc_empty_record_count(&s->rlayer); |
685 | if (RECORD_LAYER_get_empty_record_count(&s->rlayer) | |
a230b26e | 686 | > MAX_EMPTY_RECORDS) { |
94777c9c MC |
687 | al = SSL_AD_UNEXPECTED_MESSAGE; |
688 | SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_RECORD_TOO_SMALL); | |
689 | goto f_err; | |
690 | } | |
255cfeac MC |
691 | } else { |
692 | RECORD_LAYER_reset_empty_record_count(&s->rlayer); | |
fe589e61 | 693 | } |
94777c9c | 694 | } |
fe589e61 | 695 | |
70ef40a0 MC |
696 | if (s->early_data_state == SSL_EARLY_DATA_READING) { |
697 | thisrr = &rr[0]; | |
698 | if (thisrr->type == SSL3_RT_APPLICATION_DATA | |
699 | && !early_data_count_ok(s, thisrr->length, 0, &al)) | |
700 | goto f_err; | |
701 | } | |
702 | ||
94777c9c MC |
703 | RECORD_LAYER_set_numrpipes(&s->rlayer, num_recs); |
704 | return 1; | |
fe589e61 MC |
705 | |
706 | f_err: | |
707 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
708 | err: | |
94777c9c | 709 | return ret; |
fe589e61 MC |
710 | } |
711 | ||
94777c9c | 712 | int ssl3_do_uncompress(SSL *ssl, SSL3_RECORD *rr) |
fe589e61 MC |
713 | { |
714 | #ifndef OPENSSL_NO_COMP | |
715 | int i; | |
fe589e61 | 716 | |
0220fee4 MC |
717 | if (rr->comp == NULL) { |
718 | rr->comp = (unsigned char *) | |
719 | OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH); | |
720 | } | |
721 | if (rr->comp == NULL) | |
722 | return 0; | |
723 | ||
eda75751 | 724 | /* TODO(size_t): Convert this call */ |
fe589e61 | 725 | i = COMP_expand_block(ssl->expand, rr->comp, |
a230b26e | 726 | SSL3_RT_MAX_PLAIN_LENGTH, rr->data, (int)rr->length); |
fe589e61 | 727 | if (i < 0) |
0220fee4 | 728 | return 0; |
fe589e61 MC |
729 | else |
730 | rr->length = i; | |
731 | rr->data = rr->comp; | |
732 | #endif | |
0220fee4 | 733 | return 1; |
fe589e61 MC |
734 | } |
735 | ||
d102d9df | 736 | int ssl3_do_compress(SSL *ssl, SSL3_RECORD *wr) |
fe589e61 MC |
737 | { |
738 | #ifndef OPENSSL_NO_COMP | |
739 | int i; | |
fe589e61 | 740 | |
eda75751 | 741 | /* TODO(size_t): Convert this call */ |
fe589e61 | 742 | i = COMP_compress_block(ssl->compress, wr->data, |
c7c42022 | 743 | (int)(wr->length + SSL3_RT_MAX_COMPRESSED_OVERHEAD), |
fe589e61 MC |
744 | wr->input, (int)wr->length); |
745 | if (i < 0) | |
746 | return (0); | |
747 | else | |
748 | wr->length = i; | |
749 | ||
750 | wr->input = wr->data; | |
751 | #endif | |
752 | return (1); | |
753 | } | |
754 | ||
02a36fda | 755 | /*- |
37205971 | 756 | * ssl3_enc encrypts/decrypts |n_recs| records in |inrecs| |
02a36fda MC |
757 | * |
758 | * Returns: | |
759 | * 0: (in non-constant time) if the record is publically invalid (i.e. too | |
760 | * short etc). | |
761 | * 1: if the record's padding is valid / the encryption was successful. | |
762 | * -1: if the record's padding is invalid or, if sending, an internal error | |
763 | * occurred. | |
764 | */ | |
aebe9e39 | 765 | int ssl3_enc(SSL *s, SSL3_RECORD *inrecs, size_t n_recs, int sending) |
02a36fda MC |
766 | { |
767 | SSL3_RECORD *rec; | |
768 | EVP_CIPHER_CTX *ds; | |
eda75751 | 769 | size_t l, i; |
72716e79 MC |
770 | size_t bs, mac_size = 0; |
771 | int imac_size; | |
02a36fda MC |
772 | const EVP_CIPHER *enc; |
773 | ||
d102d9df | 774 | rec = inrecs; |
37205971 MC |
775 | /* |
776 | * We shouldn't ever be called with more than one record in the SSLv3 case | |
777 | */ | |
778 | if (n_recs != 1) | |
779 | return 0; | |
aebe9e39 | 780 | if (sending) { |
02a36fda | 781 | ds = s->enc_write_ctx; |
02a36fda MC |
782 | if (s->enc_write_ctx == NULL) |
783 | enc = NULL; | |
784 | else | |
785 | enc = EVP_CIPHER_CTX_cipher(s->enc_write_ctx); | |
786 | } else { | |
787 | ds = s->enc_read_ctx; | |
02a36fda MC |
788 | if (s->enc_read_ctx == NULL) |
789 | enc = NULL; | |
790 | else | |
791 | enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx); | |
792 | } | |
793 | ||
794 | if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) { | |
795 | memmove(rec->data, rec->input, rec->length); | |
796 | rec->input = rec->data; | |
797 | } else { | |
798 | l = rec->length; | |
eda75751 | 799 | /* TODO(size_t): Convert this call */ |
846ec07d | 800 | bs = EVP_CIPHER_CTX_block_size(ds); |
02a36fda MC |
801 | |
802 | /* COMPRESS */ | |
803 | ||
aebe9e39 | 804 | if ((bs != 1) && sending) { |
c08d12ca | 805 | i = bs - (l % bs); |
02a36fda MC |
806 | |
807 | /* we need to add 'i-1' padding bytes */ | |
808 | l += i; | |
809 | /* | |
810 | * the last of these zero bytes will be overwritten with the | |
811 | * padding length. | |
812 | */ | |
813 | memset(&rec->input[rec->length], 0, i); | |
814 | rec->length += i; | |
c08d12ca | 815 | rec->input[l - 1] = (unsigned char)(i - 1); |
02a36fda MC |
816 | } |
817 | ||
aebe9e39 | 818 | if (!sending) { |
02a36fda MC |
819 | if (l == 0 || l % bs != 0) |
820 | return 0; | |
821 | /* otherwise, rec->length >= bs */ | |
822 | } | |
823 | ||
eda75751 | 824 | /* TODO(size_t): Convert this call */ |
c08d12ca | 825 | if (EVP_Cipher(ds, rec->data, rec->input, (unsigned int)l) < 1) |
02a36fda MC |
826 | return -1; |
827 | ||
72716e79 MC |
828 | if (EVP_MD_CTX_md(s->read_hash) != NULL) { |
829 | /* TODO(size_t): convert me */ | |
830 | imac_size = EVP_MD_CTX_size(s->read_hash); | |
831 | if (imac_size < 0) | |
832 | return -1; | |
833 | mac_size = (size_t)imac_size; | |
834 | } | |
aebe9e39 | 835 | if ((bs != 1) && !sending) |
a773b52a | 836 | return ssl3_cbc_remove_padding(rec, bs, mac_size); |
02a36fda MC |
837 | } |
838 | return (1); | |
839 | } | |
840 | ||
72716e79 | 841 | #define MAX_PADDING 256 |
02a36fda | 842 | /*- |
37205971 | 843 | * tls1_enc encrypts/decrypts |n_recs| in |recs|. |
02a36fda MC |
844 | * |
845 | * Returns: | |
846 | * 0: (in non-constant time) if the record is publically invalid (i.e. too | |
847 | * short etc). | |
848 | * 1: if the record's padding is valid / the encryption was successful. | |
849 | * -1: if the record's padding/AEAD-authenticator is invalid or, if sending, | |
850 | * an internal error occurred. | |
851 | */ | |
aebe9e39 | 852 | int tls1_enc(SSL *s, SSL3_RECORD *recs, size_t n_recs, int sending) |
02a36fda | 853 | { |
02a36fda | 854 | EVP_CIPHER_CTX *ds; |
d102d9df MC |
855 | size_t reclen[SSL_MAX_PIPELINES]; |
856 | unsigned char buf[SSL_MAX_PIPELINES][EVP_AEAD_TLS1_AAD_LEN]; | |
72716e79 MC |
857 | int i, pad = 0, ret, tmpr; |
858 | size_t bs, mac_size = 0, ctr, padnum, loop; | |
859 | unsigned char padval; | |
860 | int imac_size; | |
02a36fda MC |
861 | const EVP_CIPHER *enc; |
862 | ||
a3004c82 JS |
863 | if (n_recs == 0) |
864 | return 0; | |
865 | ||
aebe9e39 | 866 | if (sending) { |
02a36fda MC |
867 | if (EVP_MD_CTX_md(s->write_hash)) { |
868 | int n = EVP_MD_CTX_size(s->write_hash); | |
380a522f MC |
869 | if (!ossl_assert(n >= 0)) { |
870 | SSLerr(SSL_F_TLS1_ENC, ERR_R_INTERNAL_ERROR); | |
871 | return -1; | |
872 | } | |
02a36fda MC |
873 | } |
874 | ds = s->enc_write_ctx; | |
02a36fda MC |
875 | if (s->enc_write_ctx == NULL) |
876 | enc = NULL; | |
877 | else { | |
878 | int ivlen; | |
879 | enc = EVP_CIPHER_CTX_cipher(s->enc_write_ctx); | |
880 | /* For TLSv1.1 and later explicit IV */ | |
881 | if (SSL_USE_EXPLICIT_IV(s) | |
882 | && EVP_CIPHER_mode(enc) == EVP_CIPH_CBC_MODE) | |
883 | ivlen = EVP_CIPHER_iv_length(enc); | |
884 | else | |
885 | ivlen = 0; | |
886 | if (ivlen > 1) { | |
37205971 | 887 | for (ctr = 0; ctr < n_recs; ctr++) { |
d102d9df MC |
888 | if (recs[ctr].data != recs[ctr].input) { |
889 | /* | |
890 | * we can't write into the input stream: Can this ever | |
891 | * happen?? (steve) | |
892 | */ | |
893 | SSLerr(SSL_F_TLS1_ENC, ERR_R_INTERNAL_ERROR); | |
894 | return -1; | |
ae3947de | 895 | } else if (ssl_randbytes(s, recs[ctr].input, ivlen) <= 0) { |
d102d9df MC |
896 | SSLerr(SSL_F_TLS1_ENC, ERR_R_INTERNAL_ERROR); |
897 | return -1; | |
898 | } | |
899 | } | |
02a36fda MC |
900 | } |
901 | } | |
902 | } else { | |
903 | if (EVP_MD_CTX_md(s->read_hash)) { | |
904 | int n = EVP_MD_CTX_size(s->read_hash); | |
380a522f MC |
905 | if (!ossl_assert(n >= 0)) { |
906 | SSLerr(SSL_F_TLS1_ENC, ERR_R_INTERNAL_ERROR); | |
907 | return -1; | |
908 | } | |
02a36fda MC |
909 | } |
910 | ds = s->enc_read_ctx; | |
02a36fda MC |
911 | if (s->enc_read_ctx == NULL) |
912 | enc = NULL; | |
913 | else | |
914 | enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx); | |
915 | } | |
916 | ||
02a36fda | 917 | if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) { |
37205971 | 918 | for (ctr = 0; ctr < n_recs; ctr++) { |
d102d9df MC |
919 | memmove(recs[ctr].data, recs[ctr].input, recs[ctr].length); |
920 | recs[ctr].input = recs[ctr].data; | |
921 | } | |
02a36fda MC |
922 | ret = 1; |
923 | } else { | |
d102d9df MC |
924 | bs = EVP_CIPHER_block_size(EVP_CIPHER_CTX_cipher(ds)); |
925 | ||
37205971 | 926 | if (n_recs > 1) { |
e8aa8b6c | 927 | if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ds)) |
a230b26e | 928 | & EVP_CIPH_FLAG_PIPELINE)) { |
d102d9df MC |
929 | /* |
930 | * We shouldn't have been called with pipeline data if the | |
931 | * cipher doesn't support pipelining | |
932 | */ | |
933 | SSLerr(SSL_F_TLS1_ENC, SSL_R_PIPELINE_FAILURE); | |
934 | return -1; | |
935 | } | |
936 | } | |
37205971 | 937 | for (ctr = 0; ctr < n_recs; ctr++) { |
d102d9df MC |
938 | reclen[ctr] = recs[ctr].length; |
939 | ||
940 | if (EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ds)) | |
a230b26e | 941 | & EVP_CIPH_FLAG_AEAD_CIPHER) { |
d102d9df MC |
942 | unsigned char *seq; |
943 | ||
aebe9e39 | 944 | seq = sending ? RECORD_LAYER_get_write_sequence(&s->rlayer) |
d102d9df MC |
945 | : RECORD_LAYER_get_read_sequence(&s->rlayer); |
946 | ||
947 | if (SSL_IS_DTLS(s)) { | |
948 | /* DTLS does not support pipelining */ | |
949 | unsigned char dtlsseq[9], *p = dtlsseq; | |
950 | ||
aebe9e39 | 951 | s2n(sending ? DTLS_RECORD_LAYER_get_w_epoch(&s->rlayer) : |
d102d9df MC |
952 | DTLS_RECORD_LAYER_get_r_epoch(&s->rlayer), p); |
953 | memcpy(p, &seq[2], 6); | |
954 | memcpy(buf[ctr], dtlsseq, 8); | |
955 | } else { | |
956 | memcpy(buf[ctr], seq, 8); | |
957 | for (i = 7; i >= 0; i--) { /* increment */ | |
958 | ++seq[i]; | |
959 | if (seq[i] != 0) | |
960 | break; | |
961 | } | |
962 | } | |
02a36fda | 963 | |
d102d9df MC |
964 | buf[ctr][8] = recs[ctr].type; |
965 | buf[ctr][9] = (unsigned char)(s->version >> 8); | |
966 | buf[ctr][10] = (unsigned char)(s->version); | |
c08d12ca MC |
967 | buf[ctr][11] = (unsigned char)(recs[ctr].length >> 8); |
968 | buf[ctr][12] = (unsigned char)(recs[ctr].length & 0xff); | |
d102d9df MC |
969 | pad = EVP_CIPHER_CTX_ctrl(ds, EVP_CTRL_AEAD_TLS1_AAD, |
970 | EVP_AEAD_TLS1_AAD_LEN, buf[ctr]); | |
971 | if (pad <= 0) | |
972 | return -1; | |
973 | ||
aebe9e39 | 974 | if (sending) { |
d102d9df MC |
975 | reclen[ctr] += pad; |
976 | recs[ctr].length += pad; | |
02a36fda | 977 | } |
02a36fda | 978 | |
aebe9e39 | 979 | } else if ((bs != 1) && sending) { |
c08d12ca | 980 | padnum = bs - (reclen[ctr] % bs); |
02a36fda | 981 | |
d102d9df | 982 | /* Add weird padding of upto 256 bytes */ |
02a36fda | 983 | |
72716e79 MC |
984 | if (padnum > MAX_PADDING) |
985 | return -1; | |
986 | /* we need to add 'padnum' padding bytes of value padval */ | |
c08d12ca | 987 | padval = (unsigned char)(padnum - 1); |
72716e79 MC |
988 | for (loop = reclen[ctr]; loop < reclen[ctr] + padnum; loop++) |
989 | recs[ctr].input[loop] = padval; | |
990 | reclen[ctr] += padnum; | |
991 | recs[ctr].length += padnum; | |
d102d9df MC |
992 | } |
993 | ||
aebe9e39 | 994 | if (!sending) { |
d102d9df MC |
995 | if (reclen[ctr] == 0 || reclen[ctr] % bs != 0) |
996 | return 0; | |
997 | } | |
02a36fda | 998 | } |
37205971 | 999 | if (n_recs > 1) { |
d102d9df | 1000 | unsigned char *data[SSL_MAX_PIPELINES]; |
02a36fda | 1001 | |
d102d9df | 1002 | /* Set the output buffers */ |
e8aa8b6c | 1003 | for (ctr = 0; ctr < n_recs; ctr++) { |
d102d9df MC |
1004 | data[ctr] = recs[ctr].data; |
1005 | } | |
1006 | if (EVP_CIPHER_CTX_ctrl(ds, EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS, | |
c08d12ca | 1007 | (int)n_recs, data) <= 0) { |
d102d9df MC |
1008 | SSLerr(SSL_F_TLS1_ENC, SSL_R_PIPELINE_FAILURE); |
1009 | } | |
1010 | /* Set the input buffers */ | |
e8aa8b6c | 1011 | for (ctr = 0; ctr < n_recs; ctr++) { |
d102d9df MC |
1012 | data[ctr] = recs[ctr].input; |
1013 | } | |
1014 | if (EVP_CIPHER_CTX_ctrl(ds, EVP_CTRL_SET_PIPELINE_INPUT_BUFS, | |
c08d12ca | 1015 | (int)n_recs, data) <= 0 |
d102d9df | 1016 | || EVP_CIPHER_CTX_ctrl(ds, EVP_CTRL_SET_PIPELINE_INPUT_LENS, |
c08d12ca | 1017 | (int)n_recs, reclen) <= 0) { |
d102d9df MC |
1018 | SSLerr(SSL_F_TLS1_ENC, SSL_R_PIPELINE_FAILURE); |
1019 | return -1; | |
1020 | } | |
02a36fda MC |
1021 | } |
1022 | ||
c08d12ca MC |
1023 | /* TODO(size_t): Convert this call */ |
1024 | tmpr = EVP_Cipher(ds, recs[0].data, recs[0].input, | |
1025 | (unsigned int)reclen[0]); | |
d102d9df | 1026 | if ((EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ds)) |
a230b26e | 1027 | & EVP_CIPH_FLAG_CUSTOM_CIPHER) |
72716e79 MC |
1028 | ? (tmpr < 0) |
1029 | : (tmpr == 0)) | |
02a36fda | 1030 | return -1; /* AEAD can fail to verify MAC */ |
aebe9e39 | 1031 | if (sending == 0) { |
e75c5a79 | 1032 | if (EVP_CIPHER_mode(enc) == EVP_CIPH_GCM_MODE) { |
37205971 | 1033 | for (ctr = 0; ctr < n_recs; ctr++) { |
d102d9df MC |
1034 | recs[ctr].data += EVP_GCM_TLS_EXPLICIT_IV_LEN; |
1035 | recs[ctr].input += EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
1036 | recs[ctr].length -= EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
1037 | } | |
e75c5a79 | 1038 | } else if (EVP_CIPHER_mode(enc) == EVP_CIPH_CCM_MODE) { |
37205971 | 1039 | for (ctr = 0; ctr < n_recs; ctr++) { |
d102d9df MC |
1040 | recs[ctr].data += EVP_CCM_TLS_EXPLICIT_IV_LEN; |
1041 | recs[ctr].input += EVP_CCM_TLS_EXPLICIT_IV_LEN; | |
1042 | recs[ctr].length -= EVP_CCM_TLS_EXPLICIT_IV_LEN; | |
1043 | } | |
e75c5a79 | 1044 | } |
02a36fda | 1045 | } |
02a36fda MC |
1046 | |
1047 | ret = 1; | |
28a31a0a | 1048 | if (!SSL_READ_ETM(s) && EVP_MD_CTX_md(s->read_hash) != NULL) { |
72716e79 MC |
1049 | imac_size = EVP_MD_CTX_size(s->read_hash); |
1050 | if (imac_size < 0) | |
1051 | return -1; | |
1052 | mac_size = (size_t)imac_size; | |
1053 | } | |
aebe9e39 | 1054 | if ((bs != 1) && !sending) { |
94777c9c | 1055 | int tmpret; |
37205971 | 1056 | for (ctr = 0; ctr < n_recs; ctr++) { |
94777c9c | 1057 | tmpret = tls1_cbc_remove_padding(s, &recs[ctr], bs, mac_size); |
f9cf774c MC |
1058 | /* |
1059 | * If tmpret == 0 then this means publicly invalid so we can | |
1060 | * short circuit things here. Otherwise we must respect constant | |
1061 | * time behaviour. | |
1062 | */ | |
1063 | if (tmpret == 0) | |
1064 | return 0; | |
1065 | ret = constant_time_select_int(constant_time_eq_int(tmpret, 1), | |
1066 | ret, -1); | |
94777c9c MC |
1067 | } |
1068 | } | |
aebe9e39 | 1069 | if (pad && !sending) { |
37205971 | 1070 | for (ctr = 0; ctr < n_recs; ctr++) { |
94777c9c MC |
1071 | recs[ctr].length -= pad; |
1072 | } | |
d102d9df | 1073 | } |
02a36fda MC |
1074 | } |
1075 | return ret; | |
1076 | } | |
1077 | ||
aebe9e39 | 1078 | int n_ssl3_mac(SSL *ssl, SSL3_RECORD *rec, unsigned char *md, int sending) |
02a36fda | 1079 | { |
02a36fda | 1080 | unsigned char *mac_sec, *seq; |
02a36fda MC |
1081 | const EVP_MD_CTX *hash; |
1082 | unsigned char *p, rec_char; | |
1083 | size_t md_size; | |
c08d12ca | 1084 | size_t npad; |
02a36fda MC |
1085 | int t; |
1086 | ||
aebe9e39 | 1087 | if (sending) { |
02a36fda | 1088 | mac_sec = &(ssl->s3->write_mac_secret[0]); |
de07f311 | 1089 | seq = RECORD_LAYER_get_write_sequence(&ssl->rlayer); |
02a36fda MC |
1090 | hash = ssl->write_hash; |
1091 | } else { | |
02a36fda | 1092 | mac_sec = &(ssl->s3->read_mac_secret[0]); |
de07f311 | 1093 | seq = RECORD_LAYER_get_read_sequence(&ssl->rlayer); |
02a36fda MC |
1094 | hash = ssl->read_hash; |
1095 | } | |
1096 | ||
1097 | t = EVP_MD_CTX_size(hash); | |
1098 | if (t < 0) | |
a14aa99b | 1099 | return 0; |
02a36fda MC |
1100 | md_size = t; |
1101 | npad = (48 / md_size) * md_size; | |
1102 | ||
aebe9e39 | 1103 | if (!sending && |
02a36fda MC |
1104 | EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE && |
1105 | ssl3_cbc_record_digest_supported(hash)) { | |
1106 | /* | |
1107 | * This is a CBC-encrypted record. We must avoid leaking any | |
1108 | * timing-side channel information about how many blocks of data we | |
1109 | * are hashing because that gives an attacker a timing-oracle. | |
1110 | */ | |
1111 | ||
1112 | /*- | |
1113 | * npad is, at most, 48 bytes and that's with MD5: | |
1114 | * 16 + 48 + 8 (sequence bytes) + 1 + 2 = 75. | |
1115 | * | |
1116 | * With SHA-1 (the largest hash speced for SSLv3) the hash size | |
1117 | * goes up 4, but npad goes down by 8, resulting in a smaller | |
1118 | * total size. | |
1119 | */ | |
1120 | unsigned char header[75]; | |
c08d12ca | 1121 | size_t j = 0; |
02a36fda MC |
1122 | memcpy(header + j, mac_sec, md_size); |
1123 | j += md_size; | |
1124 | memcpy(header + j, ssl3_pad_1, npad); | |
1125 | j += npad; | |
1126 | memcpy(header + j, seq, 8); | |
1127 | j += 8; | |
1128 | header[j++] = rec->type; | |
c08d12ca MC |
1129 | header[j++] = (unsigned char)(rec->length >> 8); |
1130 | header[j++] = (unsigned char)(rec->length & 0xff); | |
02a36fda MC |
1131 | |
1132 | /* Final param == is SSLv3 */ | |
5f3d93e4 MC |
1133 | if (ssl3_cbc_digest_record(hash, |
1134 | md, &md_size, | |
1135 | header, rec->input, | |
1136 | rec->length + md_size, rec->orig_len, | |
1137 | mac_sec, md_size, 1) <= 0) | |
a14aa99b | 1138 | return 0; |
02a36fda MC |
1139 | } else { |
1140 | unsigned int md_size_u; | |
1141 | /* Chop the digest off the end :-) */ | |
bfb0641f | 1142 | EVP_MD_CTX *md_ctx = EVP_MD_CTX_new(); |
6e59a892 RL |
1143 | |
1144 | if (md_ctx == NULL) | |
a14aa99b | 1145 | return 0; |
02a36fda | 1146 | |
02a36fda | 1147 | rec_char = rec->type; |
02a36fda MC |
1148 | p = md; |
1149 | s2n(rec->length, p); | |
6e59a892 | 1150 | if (EVP_MD_CTX_copy_ex(md_ctx, hash) <= 0 |
a230b26e EK |
1151 | || EVP_DigestUpdate(md_ctx, mac_sec, md_size) <= 0 |
1152 | || EVP_DigestUpdate(md_ctx, ssl3_pad_1, npad) <= 0 | |
1153 | || EVP_DigestUpdate(md_ctx, seq, 8) <= 0 | |
1154 | || EVP_DigestUpdate(md_ctx, &rec_char, 1) <= 0 | |
1155 | || EVP_DigestUpdate(md_ctx, md, 2) <= 0 | |
1156 | || EVP_DigestUpdate(md_ctx, rec->input, rec->length) <= 0 | |
1157 | || EVP_DigestFinal_ex(md_ctx, md, NULL) <= 0 | |
1158 | || EVP_MD_CTX_copy_ex(md_ctx, hash) <= 0 | |
1159 | || EVP_DigestUpdate(md_ctx, mac_sec, md_size) <= 0 | |
1160 | || EVP_DigestUpdate(md_ctx, ssl3_pad_2, npad) <= 0 | |
1161 | || EVP_DigestUpdate(md_ctx, md, md_size) <= 0 | |
1162 | || EVP_DigestFinal_ex(md_ctx, md, &md_size_u) <= 0) { | |
bfb0641f | 1163 | EVP_MD_CTX_reset(md_ctx); |
a14aa99b | 1164 | return 0; |
5f3d93e4 | 1165 | } |
02a36fda | 1166 | |
bfb0641f | 1167 | EVP_MD_CTX_free(md_ctx); |
02a36fda MC |
1168 | } |
1169 | ||
1170 | ssl3_record_sequence_update(seq); | |
a14aa99b | 1171 | return 1; |
02a36fda MC |
1172 | } |
1173 | ||
aebe9e39 | 1174 | int tls1_mac(SSL *ssl, SSL3_RECORD *rec, unsigned char *md, int sending) |
02a36fda | 1175 | { |
02a36fda MC |
1176 | unsigned char *seq; |
1177 | EVP_MD_CTX *hash; | |
1178 | size_t md_size; | |
1179 | int i; | |
6e59a892 | 1180 | EVP_MD_CTX *hmac = NULL, *mac_ctx; |
02a36fda | 1181 | unsigned char header[13]; |
aebe9e39 | 1182 | int stream_mac = (sending ? (ssl->mac_flags & SSL_MAC_FLAG_WRITE_MAC_STREAM) |
02a36fda MC |
1183 | : (ssl->mac_flags & SSL_MAC_FLAG_READ_MAC_STREAM)); |
1184 | int t; | |
1185 | ||
aebe9e39 | 1186 | if (sending) { |
de07f311 | 1187 | seq = RECORD_LAYER_get_write_sequence(&ssl->rlayer); |
02a36fda MC |
1188 | hash = ssl->write_hash; |
1189 | } else { | |
de07f311 | 1190 | seq = RECORD_LAYER_get_read_sequence(&ssl->rlayer); |
02a36fda MC |
1191 | hash = ssl->read_hash; |
1192 | } | |
1193 | ||
1194 | t = EVP_MD_CTX_size(hash); | |
380a522f MC |
1195 | if (!ossl_assert(t >= 0)) |
1196 | return 0; | |
02a36fda MC |
1197 | md_size = t; |
1198 | ||
1199 | /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */ | |
1200 | if (stream_mac) { | |
1201 | mac_ctx = hash; | |
1202 | } else { | |
bfb0641f | 1203 | hmac = EVP_MD_CTX_new(); |
a230b26e | 1204 | if (hmac == NULL || !EVP_MD_CTX_copy(hmac, hash)) |
a14aa99b | 1205 | return 0; |
6e59a892 | 1206 | mac_ctx = hmac; |
02a36fda MC |
1207 | } |
1208 | ||
1209 | if (SSL_IS_DTLS(ssl)) { | |
1210 | unsigned char dtlsseq[8], *p = dtlsseq; | |
1211 | ||
aebe9e39 | 1212 | s2n(sending ? DTLS_RECORD_LAYER_get_w_epoch(&ssl->rlayer) : |
78a39fe7 | 1213 | DTLS_RECORD_LAYER_get_r_epoch(&ssl->rlayer), p); |
02a36fda MC |
1214 | memcpy(p, &seq[2], 6); |
1215 | ||
1216 | memcpy(header, dtlsseq, 8); | |
1217 | } else | |
1218 | memcpy(header, seq, 8); | |
1219 | ||
1220 | header[8] = rec->type; | |
1221 | header[9] = (unsigned char)(ssl->version >> 8); | |
1222 | header[10] = (unsigned char)(ssl->version); | |
348240c6 MC |
1223 | header[11] = (unsigned char)(rec->length >> 8); |
1224 | header[12] = (unsigned char)(rec->length & 0xff); | |
02a36fda | 1225 | |
aebe9e39 | 1226 | if (!sending && !SSL_READ_ETM(ssl) && |
02a36fda MC |
1227 | EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE && |
1228 | ssl3_cbc_record_digest_supported(mac_ctx)) { | |
1229 | /* | |
1230 | * This is a CBC-encrypted record. We must avoid leaking any | |
1231 | * timing-side channel information about how many blocks of data we | |
1232 | * are hashing because that gives an attacker a timing-oracle. | |
1233 | */ | |
1234 | /* Final param == not SSLv3 */ | |
5f3d93e4 MC |
1235 | if (ssl3_cbc_digest_record(mac_ctx, |
1236 | md, &md_size, | |
1237 | header, rec->input, | |
1238 | rec->length + md_size, rec->orig_len, | |
1239 | ssl->s3->read_mac_secret, | |
1240 | ssl->s3->read_mac_secret_size, 0) <= 0) { | |
bfb0641f | 1241 | EVP_MD_CTX_free(hmac); |
aabe3a35 | 1242 | return 0; |
5f3d93e4 | 1243 | } |
02a36fda | 1244 | } else { |
eda75751 | 1245 | /* TODO(size_t): Convert these calls */ |
5f3d93e4 | 1246 | if (EVP_DigestSignUpdate(mac_ctx, header, sizeof(header)) <= 0 |
a230b26e EK |
1247 | || EVP_DigestSignUpdate(mac_ctx, rec->input, rec->length) <= 0 |
1248 | || EVP_DigestSignFinal(mac_ctx, md, &md_size) <= 0) { | |
bfb0641f | 1249 | EVP_MD_CTX_free(hmac); |
a14aa99b | 1250 | return 0; |
5f3d93e4 | 1251 | } |
02a36fda MC |
1252 | } |
1253 | ||
bfb0641f | 1254 | EVP_MD_CTX_free(hmac); |
5f3d93e4 | 1255 | |
d63a5e5e | 1256 | #ifdef SSL_DEBUG |
02a36fda MC |
1257 | fprintf(stderr, "seq="); |
1258 | { | |
1259 | int z; | |
1260 | for (z = 0; z < 8; z++) | |
1261 | fprintf(stderr, "%02X ", seq[z]); | |
1262 | fprintf(stderr, "\n"); | |
1263 | } | |
1264 | fprintf(stderr, "rec="); | |
1265 | { | |
eda75751 | 1266 | size_t z; |
02a36fda MC |
1267 | for (z = 0; z < rec->length; z++) |
1268 | fprintf(stderr, "%02X ", rec->data[z]); | |
1269 | fprintf(stderr, "\n"); | |
1270 | } | |
1271 | #endif | |
1272 | ||
1273 | if (!SSL_IS_DTLS(ssl)) { | |
1274 | for (i = 7; i >= 0; i--) { | |
1275 | ++seq[i]; | |
1276 | if (seq[i] != 0) | |
1277 | break; | |
1278 | } | |
1279 | } | |
d63a5e5e | 1280 | #ifdef SSL_DEBUG |
02a36fda MC |
1281 | { |
1282 | unsigned int z; | |
1283 | for (z = 0; z < md_size; z++) | |
1284 | fprintf(stderr, "%02X ", md[z]); | |
1285 | fprintf(stderr, "\n"); | |
1286 | } | |
1287 | #endif | |
a14aa99b | 1288 | return 1; |
02a36fda MC |
1289 | } |
1290 | ||
1291 | /*- | |
1292 | * ssl3_cbc_remove_padding removes padding from the decrypted, SSLv3, CBC | |
1293 | * record in |rec| by updating |rec->length| in constant time. | |
1294 | * | |
1295 | * block_size: the block size of the cipher used to encrypt the record. | |
1296 | * returns: | |
1297 | * 0: (in non-constant time) if the record is publicly invalid. | |
1298 | * 1: if the padding was valid | |
1299 | * -1: otherwise. | |
1300 | */ | |
a773b52a | 1301 | int ssl3_cbc_remove_padding(SSL3_RECORD *rec, |
72716e79 | 1302 | size_t block_size, size_t mac_size) |
02a36fda | 1303 | { |
72716e79 | 1304 | size_t padding_length; |
2688e7a0 | 1305 | size_t good; |
72716e79 | 1306 | const size_t overhead = 1 /* padding length byte */ + mac_size; |
02a36fda MC |
1307 | |
1308 | /* | |
1309 | * These lengths are all public so we can test them in non-constant time. | |
1310 | */ | |
1311 | if (overhead > rec->length) | |
1312 | return 0; | |
1313 | ||
1314 | padding_length = rec->data[rec->length - 1]; | |
2688e7a0 | 1315 | good = constant_time_ge_s(rec->length, padding_length + overhead); |
02a36fda | 1316 | /* SSLv3 requires that the padding is minimal. */ |
2688e7a0 | 1317 | good &= constant_time_ge_s(block_size, padding_length + 1); |
02a36fda | 1318 | rec->length -= good & (padding_length + 1); |
2688e7a0 | 1319 | return constant_time_select_int_s(good, 1, -1); |
02a36fda MC |
1320 | } |
1321 | ||
1322 | /*- | |
1323 | * tls1_cbc_remove_padding removes the CBC padding from the decrypted, TLS, CBC | |
1324 | * record in |rec| in constant time and returns 1 if the padding is valid and | |
1325 | * -1 otherwise. It also removes any explicit IV from the start of the record | |
1326 | * without leaking any timing about whether there was enough space after the | |
1327 | * padding was removed. | |
1328 | * | |
1329 | * block_size: the block size of the cipher used to encrypt the record. | |
1330 | * returns: | |
1331 | * 0: (in non-constant time) if the record is publicly invalid. | |
1332 | * 1: if the padding was valid | |
1333 | * -1: otherwise. | |
1334 | */ | |
1335 | int tls1_cbc_remove_padding(const SSL *s, | |
1336 | SSL3_RECORD *rec, | |
72716e79 | 1337 | size_t block_size, size_t mac_size) |
02a36fda | 1338 | { |
2688e7a0 | 1339 | size_t good; |
72716e79 MC |
1340 | size_t padding_length, to_check, i; |
1341 | const size_t overhead = 1 /* padding length byte */ + mac_size; | |
02a36fda MC |
1342 | /* Check if version requires explicit IV */ |
1343 | if (SSL_USE_EXPLICIT_IV(s)) { | |
1344 | /* | |
1345 | * These lengths are all public so we can test them in non-constant | |
1346 | * time. | |
1347 | */ | |
1348 | if (overhead + block_size > rec->length) | |
1349 | return 0; | |
1350 | /* We can now safely skip explicit IV */ | |
1351 | rec->data += block_size; | |
1352 | rec->input += block_size; | |
1353 | rec->length -= block_size; | |
1354 | rec->orig_len -= block_size; | |
1355 | } else if (overhead > rec->length) | |
1356 | return 0; | |
1357 | ||
1358 | padding_length = rec->data[rec->length - 1]; | |
1359 | ||
a230b26e EK |
1360 | if (EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(s->enc_read_ctx)) & |
1361 | EVP_CIPH_FLAG_AEAD_CIPHER) { | |
02a36fda MC |
1362 | /* padding is already verified */ |
1363 | rec->length -= padding_length + 1; | |
1364 | return 1; | |
1365 | } | |
1366 | ||
2688e7a0 | 1367 | good = constant_time_ge_s(rec->length, overhead + padding_length); |
02a36fda MC |
1368 | /* |
1369 | * The padding consists of a length byte at the end of the record and | |
1370 | * then that many bytes of padding, all with the same value as the length | |
1371 | * byte. Thus, with the length byte included, there are i+1 bytes of | |
1372 | * padding. We can't check just |padding_length+1| bytes because that | |
1373 | * leaks decrypted information. Therefore we always have to check the | |
1374 | * maximum amount of padding possible. (Again, the length of the record | |
1375 | * is public information so we can use it.) | |
1376 | */ | |
eea8723c AL |
1377 | to_check = 256; /* maximum amount of padding, inc length byte. */ |
1378 | if (to_check > rec->length) | |
1379 | to_check = rec->length; | |
02a36fda MC |
1380 | |
1381 | for (i = 0; i < to_check; i++) { | |
2688e7a0 | 1382 | unsigned char mask = constant_time_ge_8_s(padding_length, i); |
02a36fda MC |
1383 | unsigned char b = rec->data[rec->length - 1 - i]; |
1384 | /* | |
1385 | * The final |padding_length+1| bytes should all have the value | |
1386 | * |padding_length|. Therefore the XOR should be zero. | |
1387 | */ | |
1388 | good &= ~(mask & (padding_length ^ b)); | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * If any of the final |padding_length+1| bytes had the wrong value, one | |
1393 | * or more of the lower eight bits of |good| will be cleared. | |
1394 | */ | |
2688e7a0 | 1395 | good = constant_time_eq_s(0xff, good & 0xff); |
02a36fda MC |
1396 | rec->length -= good & (padding_length + 1); |
1397 | ||
2688e7a0 | 1398 | return constant_time_select_int_s(good, 1, -1); |
02a36fda MC |
1399 | } |
1400 | ||
1401 | /*- | |
1402 | * ssl3_cbc_copy_mac copies |md_size| bytes from the end of |rec| to |out| in | |
1403 | * constant time (independent of the concrete value of rec->length, which may | |
1404 | * vary within a 256-byte window). | |
1405 | * | |
1406 | * ssl3_cbc_remove_padding or tls1_cbc_remove_padding must be called prior to | |
1407 | * this function. | |
1408 | * | |
1409 | * On entry: | |
1410 | * rec->orig_len >= md_size | |
1411 | * md_size <= EVP_MAX_MD_SIZE | |
1412 | * | |
1413 | * If CBC_MAC_ROTATE_IN_PLACE is defined then the rotation is performed with | |
1414 | * variable accesses in a 64-byte-aligned buffer. Assuming that this fits into | |
1415 | * a single or pair of cache-lines, then the variable memory accesses don't | |
1416 | * actually affect the timing. CPUs with smaller cache-lines [if any] are | |
1417 | * not multi-core and are not considered vulnerable to cache-timing attacks. | |
1418 | */ | |
1419 | #define CBC_MAC_ROTATE_IN_PLACE | |
1420 | ||
380a522f | 1421 | int ssl3_cbc_copy_mac(unsigned char *out, |
72716e79 | 1422 | const SSL3_RECORD *rec, size_t md_size) |
02a36fda MC |
1423 | { |
1424 | #if defined(CBC_MAC_ROTATE_IN_PLACE) | |
1425 | unsigned char rotated_mac_buf[64 + EVP_MAX_MD_SIZE]; | |
1426 | unsigned char *rotated_mac; | |
1427 | #else | |
1428 | unsigned char rotated_mac[EVP_MAX_MD_SIZE]; | |
1429 | #endif | |
1430 | ||
1431 | /* | |
1432 | * mac_end is the index of |rec->data| just after the end of the MAC. | |
1433 | */ | |
72716e79 MC |
1434 | size_t mac_end = rec->length; |
1435 | size_t mac_start = mac_end - md_size; | |
8f77fab8 | 1436 | size_t in_mac; |
02a36fda MC |
1437 | /* |
1438 | * scan_start contains the number of bytes that we can ignore because the | |
1439 | * MAC's position can only vary by 255 bytes. | |
1440 | */ | |
72716e79 | 1441 | size_t scan_start = 0; |
2688e7a0 | 1442 | size_t i, j; |
2688e7a0 | 1443 | size_t rotate_offset; |
02a36fda | 1444 | |
380a522f MC |
1445 | if (!ossl_assert(rec->orig_len >= md_size |
1446 | && md_size <= EVP_MAX_MD_SIZE)) | |
1447 | return 0; | |
02a36fda MC |
1448 | |
1449 | #if defined(CBC_MAC_ROTATE_IN_PLACE) | |
1450 | rotated_mac = rotated_mac_buf + ((0 - (size_t)rotated_mac_buf) & 63); | |
1451 | #endif | |
1452 | ||
1453 | /* This information is public so it's safe to branch based on it. */ | |
1454 | if (rec->orig_len > md_size + 255 + 1) | |
1455 | scan_start = rec->orig_len - (md_size + 255 + 1); | |
02a36fda | 1456 | |
8f77fab8 AP |
1457 | in_mac = 0; |
1458 | rotate_offset = 0; | |
02a36fda MC |
1459 | memset(rotated_mac, 0, md_size); |
1460 | for (i = scan_start, j = 0; i < rec->orig_len; i++) { | |
8f77fab8 AP |
1461 | size_t mac_started = constant_time_eq_s(i, mac_start); |
1462 | size_t mac_ended = constant_time_lt_s(i, mac_end); | |
02a36fda | 1463 | unsigned char b = rec->data[i]; |
8f77fab8 AP |
1464 | |
1465 | in_mac |= mac_started; | |
1466 | in_mac &= mac_ended; | |
1467 | rotate_offset |= j & mac_started; | |
1468 | rotated_mac[j++] |= b & in_mac; | |
2688e7a0 | 1469 | j &= constant_time_lt_s(j, md_size); |
02a36fda MC |
1470 | } |
1471 | ||
1472 | /* Now rotate the MAC */ | |
1473 | #if defined(CBC_MAC_ROTATE_IN_PLACE) | |
1474 | j = 0; | |
1475 | for (i = 0; i < md_size; i++) { | |
1476 | /* in case cache-line is 32 bytes, touch second line */ | |
1477 | ((volatile unsigned char *)rotated_mac)[rotate_offset ^ 32]; | |
1478 | out[j++] = rotated_mac[rotate_offset++]; | |
2688e7a0 | 1479 | rotate_offset &= constant_time_lt_s(rotate_offset, md_size); |
02a36fda MC |
1480 | } |
1481 | #else | |
1482 | memset(out, 0, md_size); | |
1483 | rotate_offset = md_size - rotate_offset; | |
2688e7a0 | 1484 | rotate_offset &= constant_time_lt_s(rotate_offset, md_size); |
02a36fda MC |
1485 | for (i = 0; i < md_size; i++) { |
1486 | for (j = 0; j < md_size; j++) | |
2688e7a0 | 1487 | out[j] |= rotated_mac[i] & constant_time_eq_8_s(j, rotate_offset); |
02a36fda | 1488 | rotate_offset++; |
2688e7a0 | 1489 | rotate_offset &= constant_time_lt_s(rotate_offset, md_size); |
02a36fda MC |
1490 | } |
1491 | #endif | |
380a522f MC |
1492 | |
1493 | return 1; | |
02a36fda MC |
1494 | } |
1495 | ||
1fb9fdc3 | 1496 | int dtls1_process_record(SSL *s, DTLS1_BITMAP *bitmap) |
fe589e61 MC |
1497 | { |
1498 | int i, al; | |
1499 | int enc_err; | |
1500 | SSL_SESSION *sess; | |
1501 | SSL3_RECORD *rr; | |
72716e79 MC |
1502 | int imac_size; |
1503 | size_t mac_size; | |
fe589e61 MC |
1504 | unsigned char md[EVP_MAX_MD_SIZE]; |
1505 | ||
1506 | rr = RECORD_LAYER_get_rrec(&s->rlayer); | |
1507 | sess = s->session; | |
1508 | ||
1509 | /* | |
1510 | * At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length, | |
1511 | * and we have that many bytes in s->packet | |
1512 | */ | |
7a7048af | 1513 | rr->input = &(RECORD_LAYER_get_packet(&s->rlayer)[DTLS1_RT_HEADER_LENGTH]); |
fe589e61 MC |
1514 | |
1515 | /* | |
1516 | * ok, we can now read from 's->packet' data into 'rr' rr->input points | |
1517 | * at rr->length bytes, which need to be copied into rr->data by either | |
1518 | * the decryption or by the decompression When the data is 'copied' into | |
1519 | * the rr->data buffer, rr->input will be pointed at the new buffer | |
1520 | */ | |
1521 | ||
1522 | /* | |
1523 | * We now have - encrypted [ MAC [ compressed [ plain ] ] ] rr->length | |
1524 | * bytes of encrypted compressed stuff. | |
1525 | */ | |
1526 | ||
1527 | /* check is not needed I believe */ | |
1528 | if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) { | |
1529 | al = SSL_AD_RECORD_OVERFLOW; | |
1530 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD, SSL_R_ENCRYPTED_LENGTH_TOO_LONG); | |
1531 | goto f_err; | |
1532 | } | |
1533 | ||
1534 | /* decrypt in place in 'rr->input' */ | |
1535 | rr->data = rr->input; | |
1536 | rr->orig_len = rr->length; | |
1537 | ||
28a31a0a | 1538 | if (SSL_READ_ETM(s) && s->read_hash) { |
e23d5071 DW |
1539 | unsigned char *mac; |
1540 | mac_size = EVP_MD_CTX_size(s->read_hash); | |
380a522f MC |
1541 | if (!ossl_assert(mac_size <= EVP_MAX_MD_SIZE)) { |
1542 | al = SSL_AD_INTERNAL_ERROR; | |
1543 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD, ERR_R_INTERNAL_ERROR); | |
1544 | goto f_err; | |
1545 | } | |
e23d5071 DW |
1546 | if (rr->orig_len < mac_size) { |
1547 | al = SSL_AD_DECODE_ERROR; | |
1548 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD, SSL_R_LENGTH_TOO_SHORT); | |
1549 | goto f_err; | |
1550 | } | |
1551 | rr->length -= mac_size; | |
1552 | mac = rr->data + rr->length; | |
1553 | i = s->method->ssl3_enc->mac(s, rr, md, 0 /* not send */ ); | |
a14aa99b | 1554 | if (i == 0 || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0) { |
e23d5071 DW |
1555 | al = SSL_AD_BAD_RECORD_MAC; |
1556 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD, | |
1557 | SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC); | |
1558 | goto f_err; | |
1559 | } | |
1560 | } | |
1561 | ||
d102d9df | 1562 | enc_err = s->method->ssl3_enc->enc(s, rr, 1, 0); |
fe589e61 MC |
1563 | /*- |
1564 | * enc_err is: | |
1565 | * 0: (in non-constant time) if the record is publically invalid. | |
1566 | * 1: if the padding is valid | |
1567 | * -1: if the padding is invalid | |
1568 | */ | |
1569 | if (enc_err == 0) { | |
1570 | /* For DTLS we simply ignore bad packets. */ | |
1571 | rr->length = 0; | |
7a7048af | 1572 | RECORD_LAYER_reset_packet_length(&s->rlayer); |
fe589e61 MC |
1573 | goto err; |
1574 | } | |
d63a5e5e | 1575 | #ifdef SSL_DEBUG |
eda75751 | 1576 | printf("dec %ld\n", rr->length); |
fe589e61 | 1577 | { |
eda75751 | 1578 | size_t z; |
fe589e61 MC |
1579 | for (z = 0; z < rr->length; z++) |
1580 | printf("%02X%c", rr->data[z], ((z + 1) % 16) ? ' ' : '\n'); | |
1581 | } | |
1582 | printf("\n"); | |
1583 | #endif | |
1584 | ||
1585 | /* r->length is now the compressed data plus mac */ | |
28a31a0a | 1586 | if ((sess != NULL) && !SSL_READ_ETM(s) && |
fe589e61 MC |
1587 | (s->enc_read_ctx != NULL) && (EVP_MD_CTX_md(s->read_hash) != NULL)) { |
1588 | /* s->read_hash != NULL => mac_size != -1 */ | |
1589 | unsigned char *mac = NULL; | |
1590 | unsigned char mac_tmp[EVP_MAX_MD_SIZE]; | |
72716e79 MC |
1591 | |
1592 | /* TODO(size_t): Convert this to do size_t properly */ | |
1593 | imac_size = EVP_MD_CTX_size(s->read_hash); | |
1594 | if (imac_size < 0) { | |
1595 | al = SSL_AD_INTERNAL_ERROR; | |
1596 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD, ERR_LIB_EVP); | |
1597 | goto f_err; | |
1598 | } | |
1599 | mac_size = (size_t)imac_size; | |
380a522f MC |
1600 | if (!ossl_assert(mac_size <= EVP_MAX_MD_SIZE)) { |
1601 | al = SSL_AD_INTERNAL_ERROR; | |
1602 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD, ERR_R_INTERNAL_ERROR); | |
1603 | goto f_err; | |
1604 | } | |
fe589e61 MC |
1605 | |
1606 | /* | |
1607 | * orig_len is the length of the record before any padding was | |
1608 | * removed. This is public information, as is the MAC in use, | |
1609 | * therefore we can safely process the record in a different amount | |
1610 | * of time if it's too short to possibly contain a MAC. | |
1611 | */ | |
1612 | if (rr->orig_len < mac_size || | |
1613 | /* CBC records must have a padding length byte too. */ | |
1614 | (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE && | |
1615 | rr->orig_len < mac_size + 1)) { | |
1616 | al = SSL_AD_DECODE_ERROR; | |
1617 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD, SSL_R_LENGTH_TOO_SHORT); | |
1618 | goto f_err; | |
1619 | } | |
1620 | ||
1621 | if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE) { | |
1622 | /* | |
1623 | * We update the length so that the TLS header bytes can be | |
1624 | * constructed correctly but we need to extract the MAC in | |
1625 | * constant time from within the record, without leaking the | |
1626 | * contents of the padding bytes. | |
1627 | */ | |
1628 | mac = mac_tmp; | |
380a522f MC |
1629 | if (!ssl3_cbc_copy_mac(mac_tmp, rr, mac_size)) { |
1630 | al = SSL_AD_INTERNAL_ERROR; | |
1631 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD, ERR_R_INTERNAL_ERROR); | |
1632 | goto f_err; | |
1633 | } | |
fe589e61 MC |
1634 | rr->length -= mac_size; |
1635 | } else { | |
1636 | /* | |
1637 | * In this case there's no padding, so |rec->orig_len| equals | |
1638 | * |rec->length| and we checked that there's enough bytes for | |
1639 | * |mac_size| above. | |
1640 | */ | |
1641 | rr->length -= mac_size; | |
1642 | mac = &rr->data[rr->length]; | |
1643 | } | |
1644 | ||
d102d9df | 1645 | i = s->method->ssl3_enc->mac(s, rr, md, 0 /* not send */ ); |
a14aa99b | 1646 | if (i == 0 || mac == NULL |
72716e79 | 1647 | || CRYPTO_memcmp(md, mac, mac_size) != 0) |
fe589e61 MC |
1648 | enc_err = -1; |
1649 | if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + mac_size) | |
1650 | enc_err = -1; | |
1651 | } | |
1652 | ||
1653 | if (enc_err < 0) { | |
1654 | /* decryption failed, silently discard message */ | |
1655 | rr->length = 0; | |
7a7048af | 1656 | RECORD_LAYER_reset_packet_length(&s->rlayer); |
fe589e61 MC |
1657 | goto err; |
1658 | } | |
1659 | ||
1660 | /* r->length is now just compressed */ | |
1661 | if (s->expand != NULL) { | |
1662 | if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH) { | |
1663 | al = SSL_AD_RECORD_OVERFLOW; | |
1664 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD, | |
1665 | SSL_R_COMPRESSED_LENGTH_TOO_LONG); | |
1666 | goto f_err; | |
1667 | } | |
94777c9c | 1668 | if (!ssl3_do_uncompress(s, rr)) { |
fe589e61 MC |
1669 | al = SSL_AD_DECOMPRESSION_FAILURE; |
1670 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD, SSL_R_BAD_DECOMPRESSION); | |
1671 | goto f_err; | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH) { | |
1676 | al = SSL_AD_RECORD_OVERFLOW; | |
1677 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD, SSL_R_DATA_LENGTH_TOO_LONG); | |
1678 | goto f_err; | |
1679 | } | |
1680 | ||
1681 | rr->off = 0; | |
1682 | /*- | |
1683 | * So at this point the following is true | |
1684 | * ssl->s3->rrec.type is the type of record | |
1685 | * ssl->s3->rrec.length == number of bytes in record | |
1686 | * ssl->s3->rrec.off == offset to first valid byte | |
1687 | * ssl->s3->rrec.data == where to take bytes from, increment | |
1688 | * after use :-). | |
1689 | */ | |
1690 | ||
1691 | /* we have pulled in a full packet so zero things */ | |
7a7048af | 1692 | RECORD_LAYER_reset_packet_length(&s->rlayer); |
1fb9fdc3 MC |
1693 | |
1694 | /* Mark receipt of record. */ | |
1695 | dtls1_record_bitmap_update(s, bitmap); | |
1696 | ||
fe589e61 MC |
1697 | return (1); |
1698 | ||
1699 | f_err: | |
1700 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1701 | err: | |
1702 | return (0); | |
1703 | } | |
1704 | ||
fe589e61 | 1705 | /* |
69687aa8 | 1706 | * Retrieve a buffered record that belongs to the current epoch, i.e. processed |
fe589e61 MC |
1707 | */ |
1708 | #define dtls1_get_processed_record(s) \ | |
1709 | dtls1_retrieve_buffered_record((s), \ | |
cb2ce7ab | 1710 | &(DTLS_RECORD_LAYER_get_processed_rcds(&s->rlayer))) |
fe589e61 MC |
1711 | |
1712 | /*- | |
1713 | * Call this to get a new input record. | |
1714 | * It will return <= 0 if more data is needed, normally due to an error | |
1715 | * or non-blocking IO. | |
1716 | * When it finishes, one packet has been decoded and can be found in | |
1717 | * ssl->s3->rrec.type - is the type of record | |
1718 | * ssl->s3->rrec.data, - data | |
1719 | * ssl->s3->rrec.length, - number of bytes | |
1720 | */ | |
1721 | /* used only by dtls1_read_bytes */ | |
1722 | int dtls1_get_record(SSL *s) | |
1723 | { | |
1724 | int ssl_major, ssl_minor; | |
8e6d03ca MC |
1725 | int rret; |
1726 | size_t more, n; | |
fe589e61 MC |
1727 | SSL3_RECORD *rr; |
1728 | unsigned char *p = NULL; | |
1729 | unsigned short version; | |
1730 | DTLS1_BITMAP *bitmap; | |
1731 | unsigned int is_next_epoch; | |
1732 | ||
1733 | rr = RECORD_LAYER_get_rrec(&s->rlayer); | |
1734 | ||
738ad946 | 1735 | again: |
fe589e61 MC |
1736 | /* |
1737 | * The epoch may have changed. If so, process all the pending records. | |
1738 | * This is a non-blocking operation. | |
1739 | */ | |
1fb9fdc3 | 1740 | if (!dtls1_process_buffered_records(s)) |
fe589e61 MC |
1741 | return -1; |
1742 | ||
1743 | /* if we're renegotiating, then there may be buffered records */ | |
1744 | if (dtls1_get_processed_record(s)) | |
1745 | return 1; | |
1746 | ||
1747 | /* get something from the wire */ | |
738ad946 | 1748 | |
fe589e61 | 1749 | /* check if we have the header */ |
295c3f41 | 1750 | if ((RECORD_LAYER_get_rstate(&s->rlayer) != SSL_ST_READ_BODY) || |
7a7048af | 1751 | (RECORD_LAYER_get_packet_length(&s->rlayer) < DTLS1_RT_HEADER_LENGTH)) { |
8e6d03ca MC |
1752 | rret = ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, |
1753 | SSL3_BUFFER_get_len(&s->rlayer.rbuf), 0, 1, &n); | |
fe589e61 | 1754 | /* read timeout is handled by dtls1_read_bytes */ |
8e6d03ca MC |
1755 | if (rret <= 0) |
1756 | return rret; /* error or non-blocking */ | |
fe589e61 MC |
1757 | |
1758 | /* this packet contained a partial record, dump it */ | |
a230b26e EK |
1759 | if (RECORD_LAYER_get_packet_length(&s->rlayer) != |
1760 | DTLS1_RT_HEADER_LENGTH) { | |
7a7048af | 1761 | RECORD_LAYER_reset_packet_length(&s->rlayer); |
fe589e61 MC |
1762 | goto again; |
1763 | } | |
1764 | ||
295c3f41 | 1765 | RECORD_LAYER_set_rstate(&s->rlayer, SSL_ST_READ_BODY); |
fe589e61 | 1766 | |
7a7048af | 1767 | p = RECORD_LAYER_get_packet(&s->rlayer); |
fe589e61 MC |
1768 | |
1769 | if (s->msg_callback) | |
1770 | s->msg_callback(0, 0, SSL3_RT_HEADER, p, DTLS1_RT_HEADER_LENGTH, | |
1771 | s, s->msg_callback_arg); | |
1772 | ||
1773 | /* Pull apart the header into the DTLS1_RECORD */ | |
1774 | rr->type = *(p++); | |
1775 | ssl_major = *(p++); | |
1776 | ssl_minor = *(p++); | |
1777 | version = (ssl_major << 8) | ssl_minor; | |
1778 | ||
1779 | /* sequence number is 64 bits, with top 2 bytes = epoch */ | |
1780 | n2s(p, rr->epoch); | |
1781 | ||
de07f311 | 1782 | memcpy(&(RECORD_LAYER_get_read_sequence(&s->rlayer)[2]), p, 6); |
fe589e61 MC |
1783 | p += 6; |
1784 | ||
1785 | n2s(p, rr->length); | |
1786 | ||
1787 | /* Lets check version */ | |
1788 | if (!s->first_packet) { | |
1789 | if (version != s->version) { | |
1790 | /* unexpected version, silently discard */ | |
1791 | rr->length = 0; | |
7a7048af | 1792 | RECORD_LAYER_reset_packet_length(&s->rlayer); |
fe589e61 MC |
1793 | goto again; |
1794 | } | |
1795 | } | |
1796 | ||
1797 | if ((version & 0xff00) != (s->version & 0xff00)) { | |
1798 | /* wrong version, silently discard record */ | |
1799 | rr->length = 0; | |
7a7048af | 1800 | RECORD_LAYER_reset_packet_length(&s->rlayer); |
fe589e61 MC |
1801 | goto again; |
1802 | } | |
1803 | ||
1804 | if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) { | |
1805 | /* record too long, silently discard it */ | |
1806 | rr->length = 0; | |
7a7048af | 1807 | RECORD_LAYER_reset_packet_length(&s->rlayer); |
fe589e61 MC |
1808 | goto again; |
1809 | } | |
1810 | ||
295c3f41 | 1811 | /* now s->rlayer.rstate == SSL_ST_READ_BODY */ |
fe589e61 MC |
1812 | } |
1813 | ||
295c3f41 | 1814 | /* s->rlayer.rstate == SSL_ST_READ_BODY, get and decode the data */ |
fe589e61 | 1815 | |
7a7048af MC |
1816 | if (rr->length > |
1817 | RECORD_LAYER_get_packet_length(&s->rlayer) - DTLS1_RT_HEADER_LENGTH) { | |
fe589e61 | 1818 | /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */ |
8e6d03ca MC |
1819 | more = rr->length; |
1820 | rret = ssl3_read_n(s, more, more, 1, 1, &n); | |
fe589e61 | 1821 | /* this packet contained a partial record, dump it */ |
8e6d03ca | 1822 | if (rret <= 0 || n != more) { |
fe589e61 | 1823 | rr->length = 0; |
7a7048af | 1824 | RECORD_LAYER_reset_packet_length(&s->rlayer); |
fe589e61 MC |
1825 | goto again; |
1826 | } | |
1827 | ||
1828 | /* | |
1829 | * now n == rr->length, and s->packet_length == | |
1830 | * DTLS1_RT_HEADER_LENGTH + rr->length | |
1831 | */ | |
1832 | } | |
295c3f41 MC |
1833 | /* set state for later operations */ |
1834 | RECORD_LAYER_set_rstate(&s->rlayer, SSL_ST_READ_HEADER); | |
fe589e61 MC |
1835 | |
1836 | /* match epochs. NULL means the packet is dropped on the floor */ | |
1837 | bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch); | |
1838 | if (bitmap == NULL) { | |
1839 | rr->length = 0; | |
a230b26e | 1840 | RECORD_LAYER_reset_packet_length(&s->rlayer); /* dump this record */ |
fe589e61 MC |
1841 | goto again; /* get another record */ |
1842 | } | |
1843 | #ifndef OPENSSL_NO_SCTP | |
1844 | /* Only do replay check if no SCTP bio */ | |
1845 | if (!BIO_dgram_is_sctp(SSL_get_rbio(s))) { | |
1846 | #endif | |
912c89c5 | 1847 | /* Check whether this is a repeat, or aged record. */ |
1fb9fdc3 MC |
1848 | /* |
1849 | * TODO: Does it make sense to have replay protection in epoch 0 where | |
1850 | * we have no integrity negotiated yet? | |
1851 | */ | |
912c89c5 | 1852 | if (!dtls1_record_replay_check(s, bitmap)) { |
fe589e61 | 1853 | rr->length = 0; |
7a7048af | 1854 | RECORD_LAYER_reset_packet_length(&s->rlayer); /* dump this record */ |
fe589e61 MC |
1855 | goto again; /* get another record */ |
1856 | } | |
1857 | #ifndef OPENSSL_NO_SCTP | |
1858 | } | |
1859 | #endif | |
1860 | ||
1861 | /* just read a 0 length packet */ | |
1862 | if (rr->length == 0) | |
1863 | goto again; | |
1864 | ||
1865 | /* | |
1866 | * If this record is from the next epoch (either HM or ALERT), and a | |
1867 | * handshake is currently in progress, buffer it since it cannot be | |
912c89c5 | 1868 | * processed at this time. |
fe589e61 MC |
1869 | */ |
1870 | if (is_next_epoch) { | |
024f543c | 1871 | if ((SSL_in_init(s) || ossl_statem_get_in_handshake(s))) { |
fe589e61 | 1872 | if (dtls1_buffer_record |
cb2ce7ab | 1873 | (s, &(DTLS_RECORD_LAYER_get_unprocessed_rcds(&s->rlayer)), |
a230b26e | 1874 | rr->seq_num) < 0) |
fe589e61 | 1875 | return -1; |
fe589e61 MC |
1876 | } |
1877 | rr->length = 0; | |
7a7048af | 1878 | RECORD_LAYER_reset_packet_length(&s->rlayer); |
fe589e61 MC |
1879 | goto again; |
1880 | } | |
1881 | ||
1fb9fdc3 | 1882 | if (!dtls1_process_record(s, bitmap)) { |
fe589e61 | 1883 | rr->length = 0; |
a230b26e | 1884 | RECORD_LAYER_reset_packet_length(&s->rlayer); /* dump this record */ |
fe589e61 MC |
1885 | goto again; /* get another record */ |
1886 | } | |
fe589e61 MC |
1887 | |
1888 | return (1); | |
1889 | ||
1890 | } |