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d02b48c6 | 1 | /* ssl/s3_pkt.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
3 | * All rights reserved. |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 8 | * |
d02b48c6 RE |
9 | * This library is free for commercial and non-commercial use as long as |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 15 | * |
d02b48c6 RE |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 22 | * |
d02b48c6 RE |
23 | * Redistribution and use in source and binary forms, with or without |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d02b48c6 RE |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
0f113f3e | 52 | * |
d02b48c6 RE |
53 | * The licence and distribution terms for any publically available version or |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
c51ae173 | 58 | /* ==================================================================== |
82b0bf0b | 59 | * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. |
c51ae173 BM |
60 | * |
61 | * Redistribution and use in source and binary forms, with or without | |
62 | * modification, are permitted provided that the following conditions | |
63 | * are met: | |
64 | * | |
65 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 66 | * notice, this list of conditions and the following disclaimer. |
c51ae173 BM |
67 | * |
68 | * 2. Redistributions in binary form must reproduce the above copyright | |
69 | * notice, this list of conditions and the following disclaimer in | |
70 | * the documentation and/or other materials provided with the | |
71 | * distribution. | |
72 | * | |
73 | * 3. All advertising materials mentioning features or use of this | |
74 | * software must display the following acknowledgment: | |
75 | * "This product includes software developed by the OpenSSL Project | |
76 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
77 | * | |
78 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
79 | * endorse or promote products derived from this software without | |
80 | * prior written permission. For written permission, please contact | |
81 | * openssl-core@openssl.org. | |
82 | * | |
83 | * 5. Products derived from this software may not be called "OpenSSL" | |
84 | * nor may "OpenSSL" appear in their names without prior written | |
85 | * permission of the OpenSSL Project. | |
86 | * | |
87 | * 6. Redistributions of any form whatsoever must retain the following | |
88 | * acknowledgment: | |
89 | * "This product includes software developed by the OpenSSL Project | |
90 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
91 | * | |
92 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
93 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
94 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
95 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
96 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
97 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
98 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
99 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
100 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
101 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
102 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
103 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
104 | * ==================================================================== | |
105 | * | |
106 | * This product includes cryptographic software written by Eric Young | |
107 | * (eay@cryptsoft.com). This product includes software written by Tim | |
108 | * Hudson (tjh@cryptsoft.com). | |
109 | * | |
110 | */ | |
d02b48c6 RE |
111 | |
112 | #include <stdio.h> | |
339da43d | 113 | #include <limits.h> |
d02b48c6 RE |
114 | #include <errno.h> |
115 | #define USE_SOCKETS | |
999005e4 | 116 | #include "../ssl_locl.h" |
ec577822 BM |
117 | #include <openssl/evp.h> |
118 | #include <openssl/buffer.h> | |
637f374a | 119 | #include <openssl/rand.h> |
44cc35d3 | 120 | #include "rec_layer_locl.h" |
d02b48c6 | 121 | |
78038e09 AP |
122 | #ifndef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK |
123 | # define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0 | |
124 | #endif | |
125 | ||
0f113f3e MC |
126 | #if defined(OPENSSL_SMALL_FOOTPRINT) || \ |
127 | !( defined(AES_ASM) && ( \ | |
128 | defined(__x86_64) || defined(__x86_64__) || \ | |
129 | defined(_M_AMD64) || defined(_M_X64) || \ | |
130 | defined(__INTEL__) ) \ | |
131 | ) | |
a9c6edcd AP |
132 | # undef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK |
133 | # define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0 | |
134 | #endif | |
135 | ||
c036e210 MC |
136 | void RECORD_LAYER_init(RECORD_LAYER *rl, SSL *s) |
137 | { | |
138 | rl->s = s; | |
139 | SSL3_RECORD_clear(&rl->rrec); | |
140 | SSL3_RECORD_clear(&rl->wrec); | |
141 | } | |
142 | ||
af9752e5 MC |
143 | void RECORD_LAYER_clear(RECORD_LAYER *rl) |
144 | { | |
145 | unsigned char *rp, *wp; | |
146 | size_t rlen, wlen; | |
147 | int read_ahead; | |
148 | SSL *s; | |
5fb6f80c | 149 | DTLS_RECORD_LAYER *d; |
af9752e5 MC |
150 | |
151 | s = rl->s; | |
5fb6f80c | 152 | d = rl->d; |
af9752e5 MC |
153 | read_ahead = rl->read_ahead; |
154 | rp = SSL3_BUFFER_get_buf(&rl->rbuf); | |
155 | rlen = SSL3_BUFFER_get_len(&rl->rbuf); | |
156 | wp = SSL3_BUFFER_get_buf(&rl->wbuf); | |
157 | wlen = SSL3_BUFFER_get_len(&rl->wbuf); | |
158 | memset(rl, 0, sizeof (RECORD_LAYER)); | |
159 | SSL3_BUFFER_set_buf(&rl->rbuf, rp); | |
160 | SSL3_BUFFER_set_len(&rl->rbuf, rlen); | |
161 | SSL3_BUFFER_set_buf(&rl->wbuf, wp); | |
162 | SSL3_BUFFER_set_len(&rl->wbuf, wlen); | |
163 | ||
164 | /* Do I need to do this? As far as I can tell read_ahead did not | |
165 | * previously get reset by SSL_clear...so I'll keep it that way..but is | |
166 | * that right? | |
167 | */ | |
168 | rl->read_ahead = read_ahead; | |
295c3f41 | 169 | rl->rstate = SSL_ST_READ_HEADER; |
af9752e5 | 170 | rl->s = s; |
5fb6f80c MC |
171 | rl->d = d; |
172 | ||
173 | if(d) | |
174 | DTLS_RECORD_LAYER_clear(rl); | |
af9752e5 MC |
175 | } |
176 | ||
f161995e MC |
177 | void RECORD_LAYER_release(RECORD_LAYER *rl) |
178 | { | |
179 | if (SSL3_BUFFER_is_initialised(&rl->rbuf)) | |
180 | ssl3_release_read_buffer(rl->s); | |
181 | if (SSL3_BUFFER_is_initialised(&rl->wbuf)) | |
182 | ssl3_release_write_buffer(rl->s); | |
183 | SSL3_RECORD_release(&rl->rrec); | |
184 | } | |
185 | ||
186 | int RECORD_LAYER_read_pending(RECORD_LAYER *rl) | |
187 | { | |
188 | return SSL3_BUFFER_get_left(&rl->rbuf) != 0; | |
189 | } | |
190 | ||
191 | int RECORD_LAYER_write_pending(RECORD_LAYER *rl) | |
192 | { | |
193 | return SSL3_BUFFER_get_left(&rl->wbuf) != 0; | |
194 | } | |
195 | ||
bbcd6d7f MC |
196 | int RECORD_LAYER_set_data(RECORD_LAYER *rl, const unsigned char *buf, int len) |
197 | { | |
7a7048af | 198 | rl->packet_length = len; |
bbcd6d7f | 199 | if(len != 0) { |
295c3f41 | 200 | rl->rstate = SSL_ST_READ_HEADER; |
bbcd6d7f MC |
201 | if (!SSL3_BUFFER_is_initialised(&rl->rbuf)) |
202 | if (!ssl3_setup_read_buffer(rl->s)) | |
203 | return 0; | |
204 | } | |
205 | ||
7a7048af | 206 | rl->packet = SSL3_BUFFER_get_buf(&rl->rbuf); |
bbcd6d7f MC |
207 | SSL3_BUFFER_set_data(&rl->rbuf, buf, len); |
208 | ||
209 | return 1; | |
210 | } | |
211 | ||
295c3f41 MC |
212 | void RECORD_LAYER_dup(RECORD_LAYER *dst, RECORD_LAYER *src) |
213 | { | |
214 | /* | |
215 | * Currently only called from SSL_dup...which only seems to expect the | |
216 | * rstate to be duplicated and nothing else from the RECORD_LAYER??? | |
217 | */ | |
218 | dst->rstate = src->rstate; | |
219 | } | |
220 | ||
de07f311 MC |
221 | void RECORD_LAYER_reset_read_sequence(RECORD_LAYER *rl) |
222 | { | |
223 | memset(rl->read_sequence, 0, 8); | |
224 | } | |
225 | ||
226 | void RECORD_LAYER_reset_write_sequence(RECORD_LAYER *rl) | |
227 | { | |
228 | memset(rl->write_sequence, 0, 8); | |
229 | } | |
230 | ||
44cc35d3 | 231 | int RECORD_LAYER_setup_comp_buffer(RECORD_LAYER *rl) |
de07f311 | 232 | { |
44cc35d3 | 233 | return SSL3_RECORD_setup(&(rl)->rrec); |
de07f311 MC |
234 | } |
235 | ||
d5a25ae0 MC |
236 | int ssl3_pending(const SSL *s) |
237 | { | |
295c3f41 | 238 | if (s->rlayer.rstate == SSL_ST_READ_BODY) |
d5a25ae0 MC |
239 | return 0; |
240 | ||
241 | return (SSL3_RECORD_get_type(&s->rlayer.rrec) == SSL3_RT_APPLICATION_DATA) | |
242 | ? SSL3_RECORD_get_length(&s->rlayer.rrec) : 0; | |
243 | } | |
244 | ||
295c3f41 MC |
245 | const char *SSL_rstate_string_long(const SSL *s) |
246 | { | |
247 | const char *str; | |
248 | ||
249 | switch (s->rlayer.rstate) { | |
250 | case SSL_ST_READ_HEADER: | |
251 | str = "read header"; | |
252 | break; | |
253 | case SSL_ST_READ_BODY: | |
254 | str = "read body"; | |
255 | break; | |
256 | case SSL_ST_READ_DONE: | |
257 | str = "read done"; | |
258 | break; | |
259 | default: | |
260 | str = "unknown"; | |
261 | break; | |
262 | } | |
263 | return (str); | |
264 | } | |
265 | ||
266 | const char *SSL_rstate_string(const SSL *s) | |
267 | { | |
268 | const char *str; | |
269 | ||
270 | switch (s->rlayer.rstate) { | |
271 | case SSL_ST_READ_HEADER: | |
272 | str = "RH"; | |
273 | break; | |
274 | case SSL_ST_READ_BODY: | |
275 | str = "RB"; | |
276 | break; | |
277 | case SSL_ST_READ_DONE: | |
278 | str = "RD"; | |
279 | break; | |
280 | default: | |
281 | str = "unknown"; | |
282 | break; | |
283 | } | |
284 | return (str); | |
285 | } | |
286 | ||
36d16f8e | 287 | int ssl3_read_n(SSL *s, int n, int max, int extend) |
0f113f3e MC |
288 | { |
289 | /* | |
290 | * If extend == 0, obtain new n-byte packet; if extend == 1, increase | |
291 | * packet by another n bytes. The packet will be in the sub-array of | |
292 | * s->s3->rbuf.buf specified by s->packet and s->packet_length. (If | |
52e1d7b1 | 293 | * s->rlayer.read_ahead is set, 'max' bytes may be stored in rbuf [plus |
0f113f3e MC |
294 | * s->packet_length bytes if extend == 1].) |
295 | */ | |
296 | int i, len, left; | |
297 | long align = 0; | |
298 | unsigned char *pkt; | |
299 | SSL3_BUFFER *rb; | |
300 | ||
301 | if (n <= 0) | |
302 | return n; | |
303 | ||
88c23039 | 304 | rb = &s->rlayer.rbuf; |
0f113f3e MC |
305 | if (rb->buf == NULL) |
306 | if (!ssl3_setup_read_buffer(s)) | |
307 | return -1; | |
308 | ||
309 | left = rb->left; | |
a4d64c7f | 310 | #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 |
0f113f3e MC |
311 | align = (long)rb->buf + SSL3_RT_HEADER_LENGTH; |
312 | align = (-align) & (SSL3_ALIGN_PAYLOAD - 1); | |
a4d64c7f | 313 | #endif |
d02b48c6 | 314 | |
0f113f3e MC |
315 | if (!extend) { |
316 | /* start with empty packet ... */ | |
317 | if (left == 0) | |
318 | rb->offset = align; | |
319 | else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH) { | |
320 | /* | |
321 | * check if next packet length is large enough to justify payload | |
322 | * alignment... | |
323 | */ | |
324 | pkt = rb->buf + rb->offset; | |
325 | if (pkt[0] == SSL3_RT_APPLICATION_DATA | |
326 | && (pkt[3] << 8 | pkt[4]) >= 128) { | |
327 | /* | |
328 | * Note that even if packet is corrupted and its length field | |
329 | * is insane, we can only be led to wrong decision about | |
330 | * whether memmove will occur or not. Header values has no | |
331 | * effect on memmove arguments and therefore no buffer | |
332 | * overrun can be triggered. | |
333 | */ | |
334 | memmove(rb->buf + align, pkt, left); | |
335 | rb->offset = align; | |
336 | } | |
337 | } | |
7a7048af MC |
338 | s->rlayer.packet = rb->buf + rb->offset; |
339 | s->rlayer.packet_length = 0; | |
0f113f3e MC |
340 | /* ... now we can act as if 'extend' was set */ |
341 | } | |
342 | ||
343 | /* | |
344 | * For DTLS/UDP reads should not span multiple packets because the read | |
345 | * operation returns the whole packet at once (as long as it fits into | |
346 | * the buffer). | |
347 | */ | |
348 | if (SSL_IS_DTLS(s)) { | |
349 | if (left == 0 && extend) | |
350 | return 0; | |
351 | if (left > 0 && n > left) | |
352 | n = left; | |
353 | } | |
354 | ||
355 | /* if there is enough in the buffer from a previous read, take some */ | |
356 | if (left >= n) { | |
7a7048af | 357 | s->rlayer.packet_length += n; |
0f113f3e MC |
358 | rb->left = left - n; |
359 | rb->offset += n; | |
360 | return (n); | |
361 | } | |
362 | ||
363 | /* else we need to read more data */ | |
364 | ||
7a7048af | 365 | len = s->rlayer.packet_length; |
0f113f3e MC |
366 | pkt = rb->buf + align; |
367 | /* | |
368 | * Move any available bytes to front of buffer: 'len' bytes already | |
369 | * pointed to by 'packet', 'left' extra ones at the end | |
370 | */ | |
7a7048af MC |
371 | if (s->rlayer.packet != pkt) { /* len > 0 */ |
372 | memmove(pkt, s->rlayer.packet, len + left); | |
373 | s->rlayer.packet = pkt; | |
0f113f3e MC |
374 | rb->offset = len + align; |
375 | } | |
376 | ||
377 | if (n > (int)(rb->len - rb->offset)) { /* does not happen */ | |
378 | SSLerr(SSL_F_SSL3_READ_N, ERR_R_INTERNAL_ERROR); | |
379 | return -1; | |
380 | } | |
381 | ||
8dd4ad0f | 382 | /* We always act like read_ahead is set for DTLS */ |
24a90afd | 383 | if (&s->rlayer.read_ahead && !SSL_IS_DTLS(s)) |
0f113f3e MC |
384 | /* ignore max parameter */ |
385 | max = n; | |
386 | else { | |
387 | if (max < n) | |
388 | max = n; | |
389 | if (max > (int)(rb->len - rb->offset)) | |
390 | max = rb->len - rb->offset; | |
391 | } | |
392 | ||
393 | while (left < n) { | |
394 | /* | |
395 | * Now we have len+left bytes at the front of s->s3->rbuf.buf and | |
396 | * need to read in more until we have len+n (up to len+max if | |
397 | * possible) | |
398 | */ | |
399 | ||
400 | clear_sys_error(); | |
401 | if (s->rbio != NULL) { | |
402 | s->rwstate = SSL_READING; | |
403 | i = BIO_read(s->rbio, pkt + len + left, max - left); | |
404 | } else { | |
405 | SSLerr(SSL_F_SSL3_READ_N, SSL_R_READ_BIO_NOT_SET); | |
406 | i = -1; | |
407 | } | |
408 | ||
409 | if (i <= 0) { | |
410 | rb->left = left; | |
411 | if (s->mode & SSL_MODE_RELEASE_BUFFERS && !SSL_IS_DTLS(s)) | |
412 | if (len + left == 0) | |
413 | ssl3_release_read_buffer(s); | |
414 | return (i); | |
415 | } | |
416 | left += i; | |
417 | /* | |
418 | * reads should *never* span multiple packets for DTLS because the | |
419 | * underlying transport protocol is message oriented as opposed to | |
420 | * byte oriented as in the TLS case. | |
421 | */ | |
422 | if (SSL_IS_DTLS(s)) { | |
423 | if (n > left) | |
424 | n = left; /* makes the while condition false */ | |
425 | } | |
426 | } | |
427 | ||
428 | /* done reading, now the book-keeping */ | |
429 | rb->offset += n; | |
430 | rb->left = left - n; | |
7a7048af | 431 | s->rlayer.packet_length += n; |
0f113f3e MC |
432 | s->rwstate = SSL_NOTHING; |
433 | return (n); | |
434 | } | |
435 | ||
d02b48c6 | 436 | |
0f113f3e MC |
437 | /* |
438 | * Call this to write data in records of type 'type' It will return <= 0 if | |
439 | * not all data has been sent or non-blocking IO. | |
d02b48c6 | 440 | */ |
52732b38 | 441 | int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len) |
0f113f3e MC |
442 | { |
443 | const unsigned char *buf = buf_; | |
444 | int tot; | |
445 | unsigned int n, nw; | |
f1f7598c | 446 | #if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK |
0f113f3e | 447 | unsigned int max_send_fragment; |
f1f7598c | 448 | #endif |
88c23039 | 449 | SSL3_BUFFER *wb = &s->rlayer.wbuf; |
0f113f3e MC |
450 | int i; |
451 | unsigned int u_len = (unsigned int)len; | |
452 | ||
453 | if (len < 0) { | |
454 | SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_SSL_NEGATIVE_LENGTH); | |
455 | return -1; | |
456 | } | |
457 | ||
458 | s->rwstate = SSL_NOTHING; | |
e2228d31 MC |
459 | OPENSSL_assert(s->rlayer.wnum <= INT_MAX); |
460 | tot = s->rlayer.wnum; | |
461 | s->rlayer.wnum = 0; | |
0f113f3e MC |
462 | |
463 | if (SSL_in_init(s) && !s->in_handshake) { | |
464 | i = s->handshake_func(s); | |
465 | if (i < 0) | |
466 | return (i); | |
467 | if (i == 0) { | |
468 | SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
469 | return -1; | |
470 | } | |
471 | } | |
472 | ||
473 | /* | |
474 | * ensure that if we end up with a smaller value of data to write out | |
475 | * than the the original len from a write which didn't complete for | |
476 | * non-blocking I/O and also somehow ended up avoiding the check for | |
477 | * this in ssl3_write_pending/SSL_R_BAD_WRITE_RETRY as it must never be | |
478 | * possible to end up with (len-tot) as a large number that will then | |
479 | * promptly send beyond the end of the users buffer ... so we trap and | |
480 | * report the error in a way the user will notice | |
481 | */ | |
482 | if (len < tot) { | |
483 | SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_BAD_LENGTH); | |
484 | return (-1); | |
485 | } | |
486 | ||
487 | /* | |
488 | * first check if there is a SSL3_BUFFER still being written out. This | |
489 | * will happen with non blocking IO | |
490 | */ | |
491 | if (wb->left != 0) { | |
f8caa3c8 | 492 | i = ssl3_write_pending(s, type, &buf[tot], s->rlayer.wpend_tot); |
0f113f3e MC |
493 | if (i <= 0) { |
494 | /* XXX should we ssl3_release_write_buffer if i<0? */ | |
e2228d31 | 495 | s->rlayer.wnum = tot; |
0f113f3e MC |
496 | return i; |
497 | } | |
498 | tot += i; /* this might be last fragment */ | |
499 | } | |
a9c6edcd | 500 | #if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK |
0f113f3e MC |
501 | /* |
502 | * Depending on platform multi-block can deliver several *times* | |
503 | * better performance. Downside is that it has to allocate | |
504 | * jumbo buffer to accomodate up to 8 records, but the | |
505 | * compromise is considered worthy. | |
506 | */ | |
507 | if (type == SSL3_RT_APPLICATION_DATA && | |
508 | u_len >= 4 * (max_send_fragment = s->max_send_fragment) && | |
509 | s->compress == NULL && s->msg_callback == NULL && | |
510 | !SSL_USE_ETM(s) && SSL_USE_EXPLICIT_IV(s) && | |
739a5eee | 511 | EVP_CIPHER_flags(s->enc_write_ctx->cipher) & |
0f113f3e MC |
512 | EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK) { |
513 | unsigned char aad[13]; | |
514 | EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param; | |
515 | int packlen; | |
516 | ||
517 | /* minimize address aliasing conflicts */ | |
518 | if ((max_send_fragment & 0xfff) == 0) | |
519 | max_send_fragment -= 512; | |
520 | ||
521 | if (tot == 0 || wb->buf == NULL) { /* allocate jumbo buffer */ | |
522 | ssl3_release_write_buffer(s); | |
523 | ||
524 | packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx, | |
525 | EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE, | |
526 | max_send_fragment, NULL); | |
527 | ||
528 | if (u_len >= 8 * max_send_fragment) | |
529 | packlen *= 8; | |
530 | else | |
531 | packlen *= 4; | |
532 | ||
533 | wb->buf = OPENSSL_malloc(packlen); | |
918bb865 MC |
534 | if(!wb->buf) { |
535 | SSLerr(SSL_F_SSL3_WRITE_BYTES, ERR_R_MALLOC_FAILURE); | |
536 | return -1; | |
537 | } | |
0f113f3e MC |
538 | wb->len = packlen; |
539 | } else if (tot == len) { /* done? */ | |
540 | OPENSSL_free(wb->buf); /* free jumbo buffer */ | |
541 | wb->buf = NULL; | |
542 | return tot; | |
543 | } | |
544 | ||
545 | n = (len - tot); | |
546 | for (;;) { | |
547 | if (n < 4 * max_send_fragment) { | |
548 | OPENSSL_free(wb->buf); /* free jumbo buffer */ | |
549 | wb->buf = NULL; | |
550 | break; | |
551 | } | |
552 | ||
553 | if (s->s3->alert_dispatch) { | |
554 | i = s->method->ssl_dispatch_alert(s); | |
555 | if (i <= 0) { | |
e2228d31 | 556 | s->rlayer.wnum = tot; |
0f113f3e MC |
557 | return i; |
558 | } | |
559 | } | |
560 | ||
561 | if (n >= 8 * max_send_fragment) | |
562 | nw = max_send_fragment * (mb_param.interleave = 8); | |
563 | else | |
564 | nw = max_send_fragment * (mb_param.interleave = 4); | |
565 | ||
de07f311 | 566 | memcpy(aad, s->rlayer.write_sequence, 8); |
0f113f3e MC |
567 | aad[8] = type; |
568 | aad[9] = (unsigned char)(s->version >> 8); | |
569 | aad[10] = (unsigned char)(s->version); | |
570 | aad[11] = 0; | |
571 | aad[12] = 0; | |
572 | mb_param.out = NULL; | |
573 | mb_param.inp = aad; | |
574 | mb_param.len = nw; | |
575 | ||
576 | packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx, | |
577 | EVP_CTRL_TLS1_1_MULTIBLOCK_AAD, | |
578 | sizeof(mb_param), &mb_param); | |
579 | ||
580 | if (packlen <= 0 || packlen > (int)wb->len) { /* never happens */ | |
581 | OPENSSL_free(wb->buf); /* free jumbo buffer */ | |
582 | wb->buf = NULL; | |
583 | break; | |
584 | } | |
585 | ||
586 | mb_param.out = wb->buf; | |
587 | mb_param.inp = &buf[tot]; | |
588 | mb_param.len = nw; | |
589 | ||
590 | if (EVP_CIPHER_CTX_ctrl(s->enc_write_ctx, | |
591 | EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT, | |
592 | sizeof(mb_param), &mb_param) <= 0) | |
593 | return -1; | |
594 | ||
de07f311 MC |
595 | s->rlayer.write_sequence[7] += mb_param.interleave; |
596 | if (s->rlayer.write_sequence[7] < mb_param.interleave) { | |
0f113f3e | 597 | int j = 6; |
de07f311 | 598 | while (j >= 0 && (++s->rlayer.write_sequence[j--]) == 0) ; |
0f113f3e MC |
599 | } |
600 | ||
601 | wb->offset = 0; | |
602 | wb->left = packlen; | |
603 | ||
f8caa3c8 MC |
604 | s->rlayer.wpend_tot = nw; |
605 | s->rlayer.wpend_buf = &buf[tot]; | |
606 | s->rlayer.wpend_type = type; | |
607 | s->rlayer.wpend_ret = nw; | |
0f113f3e MC |
608 | |
609 | i = ssl3_write_pending(s, type, &buf[tot], nw); | |
610 | if (i <= 0) { | |
1d2a18dc | 611 | if (i < 0 && (!s->wbio || !BIO_should_retry(s->wbio))) { |
0f113f3e MC |
612 | OPENSSL_free(wb->buf); |
613 | wb->buf = NULL; | |
614 | } | |
e2228d31 | 615 | s->rlayer.wnum = tot; |
0f113f3e MC |
616 | return i; |
617 | } | |
618 | if (i == (int)n) { | |
619 | OPENSSL_free(wb->buf); /* free jumbo buffer */ | |
620 | wb->buf = NULL; | |
621 | return tot + i; | |
622 | } | |
623 | n -= i; | |
624 | tot += i; | |
625 | } | |
626 | } else | |
a9c6edcd | 627 | #endif |
0f113f3e MC |
628 | if (tot == len) { /* done? */ |
629 | if (s->mode & SSL_MODE_RELEASE_BUFFERS && !SSL_IS_DTLS(s)) | |
630 | ssl3_release_write_buffer(s); | |
631 | ||
632 | return tot; | |
633 | } | |
634 | ||
635 | n = (len - tot); | |
636 | for (;;) { | |
637 | if (n > s->max_send_fragment) | |
638 | nw = s->max_send_fragment; | |
639 | else | |
640 | nw = n; | |
641 | ||
642 | i = do_ssl3_write(s, type, &(buf[tot]), nw, 0); | |
643 | if (i <= 0) { | |
644 | /* XXX should we ssl3_release_write_buffer if i<0? */ | |
e2228d31 | 645 | s->rlayer.wnum = tot; |
0f113f3e MC |
646 | return i; |
647 | } | |
648 | ||
649 | if ((i == (int)n) || | |
650 | (type == SSL3_RT_APPLICATION_DATA && | |
651 | (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))) { | |
652 | /* | |
653 | * next chunk of data should get another prepended empty fragment | |
654 | * in ciphersuites with known-IV weakness: | |
655 | */ | |
656 | s->s3->empty_fragment_done = 0; | |
657 | ||
658 | if ((i == (int)n) && s->mode & SSL_MODE_RELEASE_BUFFERS && | |
659 | !SSL_IS_DTLS(s)) | |
660 | ssl3_release_write_buffer(s); | |
661 | ||
662 | return tot + i; | |
663 | } | |
664 | ||
665 | n -= i; | |
666 | tot += i; | |
667 | } | |
668 | } | |
d02b48c6 | 669 | |
c103c7e2 MC |
670 | int do_ssl3_write(SSL *s, int type, const unsigned char *buf, |
671 | unsigned int len, int create_empty_fragment) | |
0f113f3e MC |
672 | { |
673 | unsigned char *p, *plen; | |
674 | int i, mac_size, clear = 0; | |
675 | int prefix_len = 0; | |
676 | int eivlen; | |
677 | long align = 0; | |
678 | SSL3_RECORD *wr; | |
88c23039 | 679 | SSL3_BUFFER *wb = &s->rlayer.wbuf; |
0f113f3e MC |
680 | SSL_SESSION *sess; |
681 | ||
682 | /* | |
683 | * first check if there is a SSL3_BUFFER still being written out. This | |
684 | * will happen with non blocking IO | |
685 | */ | |
686 | if (wb->left != 0) | |
687 | return (ssl3_write_pending(s, type, buf, len)); | |
688 | ||
689 | /* If we have an alert to send, lets send it */ | |
690 | if (s->s3->alert_dispatch) { | |
691 | i = s->method->ssl_dispatch_alert(s); | |
692 | if (i <= 0) | |
693 | return (i); | |
694 | /* if it went, fall through and send more stuff */ | |
695 | } | |
696 | ||
697 | if (wb->buf == NULL) | |
698 | if (!ssl3_setup_write_buffer(s)) | |
699 | return -1; | |
700 | ||
701 | if (len == 0 && !create_empty_fragment) | |
702 | return 0; | |
703 | ||
88c23039 | 704 | wr = &s->rlayer.wrec; |
0f113f3e MC |
705 | sess = s->session; |
706 | ||
707 | if ((sess == NULL) || | |
708 | (s->enc_write_ctx == NULL) || | |
709 | (EVP_MD_CTX_md(s->write_hash) == NULL)) { | |
0f113f3e | 710 | clear = s->enc_write_ctx ? 0 : 1; /* must be AEAD cipher */ |
0f113f3e MC |
711 | mac_size = 0; |
712 | } else { | |
713 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
714 | if (mac_size < 0) | |
715 | goto err; | |
716 | } | |
d02b48c6 | 717 | |
0f113f3e MC |
718 | /* |
719 | * 'create_empty_fragment' is true only when this function calls itself | |
720 | */ | |
721 | if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done) { | |
722 | /* | |
723 | * countermeasure against known-IV weakness in CBC ciphersuites (see | |
724 | * http://www.openssl.org/~bodo/tls-cbc.txt) | |
725 | */ | |
726 | ||
727 | if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) { | |
728 | /* | |
729 | * recursive function call with 'create_empty_fragment' set; this | |
730 | * prepares and buffers the data for an empty fragment (these | |
731 | * 'prefix_len' bytes are sent out later together with the actual | |
732 | * payload) | |
733 | */ | |
734 | prefix_len = do_ssl3_write(s, type, buf, 0, 1); | |
735 | if (prefix_len <= 0) | |
736 | goto err; | |
737 | ||
738 | if (prefix_len > | |
739 | (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD)) | |
740 | { | |
741 | /* insufficient space */ | |
742 | SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR); | |
743 | goto err; | |
744 | } | |
745 | } | |
746 | ||
747 | s->s3->empty_fragment_done = 1; | |
748 | } | |
749 | ||
750 | if (create_empty_fragment) { | |
a4d64c7f | 751 | #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 |
0f113f3e MC |
752 | /* |
753 | * extra fragment would be couple of cipher blocks, which would be | |
754 | * multiple of SSL3_ALIGN_PAYLOAD, so if we want to align the real | |
755 | * payload, then we can just pretent we simply have two headers. | |
756 | */ | |
757 | align = (long)wb->buf + 2 * SSL3_RT_HEADER_LENGTH; | |
758 | align = (-align) & (SSL3_ALIGN_PAYLOAD - 1); | |
a4d64c7f | 759 | #endif |
0f113f3e MC |
760 | p = wb->buf + align; |
761 | wb->offset = align; | |
762 | } else if (prefix_len) { | |
763 | p = wb->buf + wb->offset + prefix_len; | |
764 | } else { | |
a4d64c7f | 765 | #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 |
0f113f3e MC |
766 | align = (long)wb->buf + SSL3_RT_HEADER_LENGTH; |
767 | align = (-align) & (SSL3_ALIGN_PAYLOAD - 1); | |
a4d64c7f | 768 | #endif |
0f113f3e MC |
769 | p = wb->buf + align; |
770 | wb->offset = align; | |
771 | } | |
772 | ||
773 | /* write the header */ | |
774 | ||
775 | *(p++) = type & 0xff; | |
776 | wr->type = type; | |
777 | ||
778 | *(p++) = (s->version >> 8); | |
779 | /* | |
780 | * Some servers hang if iniatial client hello is larger than 256 bytes | |
781 | * and record version number > TLS 1.0 | |
782 | */ | |
783 | if (s->state == SSL3_ST_CW_CLNT_HELLO_B | |
784 | && !s->renegotiate && TLS1_get_version(s) > TLS1_VERSION) | |
785 | *(p++) = 0x1; | |
786 | else | |
787 | *(p++) = s->version & 0xff; | |
788 | ||
789 | /* field where we are to write out packet length */ | |
790 | plen = p; | |
791 | p += 2; | |
792 | /* Explicit IV length, block ciphers appropriate version flag */ | |
793 | if (s->enc_write_ctx && SSL_USE_EXPLICIT_IV(s)) { | |
794 | int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx); | |
795 | if (mode == EVP_CIPH_CBC_MODE) { | |
796 | eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx); | |
797 | if (eivlen <= 1) | |
798 | eivlen = 0; | |
799 | } | |
800 | /* Need explicit part of IV for GCM mode */ | |
801 | else if (mode == EVP_CIPH_GCM_MODE) | |
802 | eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN; | |
803 | else | |
804 | eivlen = 0; | |
805 | } else | |
806 | eivlen = 0; | |
807 | ||
808 | /* lets setup the record stuff. */ | |
809 | wr->data = p + eivlen; | |
810 | wr->length = (int)len; | |
811 | wr->input = (unsigned char *)buf; | |
812 | ||
813 | /* | |
814 | * we now 'read' from wr->input, wr->length bytes into wr->data | |
815 | */ | |
816 | ||
817 | /* first we compress */ | |
818 | if (s->compress != NULL) { | |
819 | if (!ssl3_do_compress(s)) { | |
820 | SSLerr(SSL_F_DO_SSL3_WRITE, SSL_R_COMPRESSION_FAILURE); | |
821 | goto err; | |
822 | } | |
823 | } else { | |
824 | memcpy(wr->data, wr->input, wr->length); | |
825 | wr->input = wr->data; | |
826 | } | |
827 | ||
828 | /* | |
829 | * we should still have the output to wr->data and the input from | |
830 | * wr->input. Length should be wr->length. wr->data still points in the | |
831 | * wb->buf | |
832 | */ | |
833 | ||
834 | if (!SSL_USE_ETM(s) && mac_size != 0) { | |
835 | if (s->method->ssl3_enc->mac(s, &(p[wr->length + eivlen]), 1) < 0) | |
836 | goto err; | |
837 | wr->length += mac_size; | |
838 | } | |
839 | ||
840 | wr->input = p; | |
841 | wr->data = p; | |
842 | ||
843 | if (eivlen) { | |
844 | /* | |
845 | * if (RAND_pseudo_bytes(p, eivlen) <= 0) goto err; | |
846 | */ | |
847 | wr->length += eivlen; | |
848 | } | |
849 | ||
850 | if (s->method->ssl3_enc->enc(s, 1) < 1) | |
851 | goto err; | |
852 | ||
853 | if (SSL_USE_ETM(s) && mac_size != 0) { | |
854 | if (s->method->ssl3_enc->mac(s, p + wr->length, 1) < 0) | |
855 | goto err; | |
856 | wr->length += mac_size; | |
857 | } | |
858 | ||
859 | /* record length after mac and block padding */ | |
860 | s2n(wr->length, plen); | |
861 | ||
862 | if (s->msg_callback) | |
863 | s->msg_callback(1, 0, SSL3_RT_HEADER, plen - 5, 5, s, | |
864 | s->msg_callback_arg); | |
865 | ||
866 | /* | |
867 | * we should now have wr->data pointing to the encrypted data, which is | |
868 | * wr->length long | |
869 | */ | |
870 | wr->type = type; /* not needed but helps for debugging */ | |
871 | wr->length += SSL3_RT_HEADER_LENGTH; | |
872 | ||
873 | if (create_empty_fragment) { | |
874 | /* | |
875 | * we are in a recursive call; just return the length, don't write | |
876 | * out anything here | |
877 | */ | |
878 | return wr->length; | |
879 | } | |
880 | ||
881 | /* now let's set up wb */ | |
882 | wb->left = prefix_len + wr->length; | |
883 | ||
884 | /* | |
885 | * memorize arguments so that ssl3_write_pending can detect bad write | |
886 | * retries later | |
887 | */ | |
f8caa3c8 MC |
888 | s->rlayer.wpend_tot = len; |
889 | s->rlayer.wpend_buf = buf; | |
890 | s->rlayer.wpend_type = type; | |
891 | s->rlayer.wpend_ret = len; | |
0f113f3e MC |
892 | |
893 | /* we now just need to write the buffer */ | |
894 | return ssl3_write_pending(s, type, buf, len); | |
895 | err: | |
896 | return -1; | |
897 | } | |
d02b48c6 RE |
898 | |
899 | /* if s->s3->wbuf.left != 0, we need to call this */ | |
36d16f8e | 900 | int ssl3_write_pending(SSL *s, int type, const unsigned char *buf, |
0f113f3e MC |
901 | unsigned int len) |
902 | { | |
903 | int i; | |
88c23039 | 904 | SSL3_BUFFER *wb = &s->rlayer.wbuf; |
d02b48c6 | 905 | |
58964a49 | 906 | /* XXXX */ |
f8caa3c8 MC |
907 | if ((s->rlayer.wpend_tot > (int)len) |
908 | || ((s->rlayer.wpend_buf != buf) && | |
0f113f3e | 909 | !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)) |
f8caa3c8 | 910 | || (s->rlayer.wpend_type != type)) { |
0f113f3e MC |
911 | SSLerr(SSL_F_SSL3_WRITE_PENDING, SSL_R_BAD_WRITE_RETRY); |
912 | return (-1); | |
913 | } | |
914 | ||
915 | for (;;) { | |
916 | clear_sys_error(); | |
917 | if (s->wbio != NULL) { | |
918 | s->rwstate = SSL_WRITING; | |
919 | i = BIO_write(s->wbio, | |
920 | (char *)&(wb->buf[wb->offset]), | |
921 | (unsigned int)wb->left); | |
922 | } else { | |
923 | SSLerr(SSL_F_SSL3_WRITE_PENDING, SSL_R_BIO_NOT_SET); | |
924 | i = -1; | |
925 | } | |
926 | if (i == wb->left) { | |
927 | wb->left = 0; | |
928 | wb->offset += i; | |
929 | s->rwstate = SSL_NOTHING; | |
f8caa3c8 | 930 | return (s->rlayer.wpend_ret); |
0f113f3e MC |
931 | } else if (i <= 0) { |
932 | if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) { | |
933 | /* | |
934 | * For DTLS, just drop it. That's kind of the whole point in | |
935 | * using a datagram service | |
936 | */ | |
937 | wb->left = 0; | |
938 | } | |
939 | return (i); | |
940 | } | |
941 | wb->offset += i; | |
942 | wb->left -= i; | |
943 | } | |
944 | } | |
d02b48c6 | 945 | |
1d97c843 TH |
946 | /*- |
947 | * Return up to 'len' payload bytes received in 'type' records. | |
b35e9050 BM |
948 | * 'type' is one of the following: |
949 | * | |
950 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
951 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
952 | * - 0 (during a shutdown, no data has to be returned) | |
953 | * | |
954 | * If we don't have stored data to work from, read a SSL/TLS record first | |
955 | * (possibly multiple records if we still don't have anything to return). | |
956 | * | |
957 | * This function must handle any surprises the peer may have for us, such as | |
958 | * Alert records (e.g. close_notify), ChangeCipherSpec records (not really | |
959 | * a surprise, but handled as if it were), or renegotiation requests. | |
960 | * Also if record payloads contain fragments too small to process, we store | |
961 | * them until there is enough for the respective protocol (the record protocol | |
962 | * may use arbitrary fragmentation and even interleaving): | |
963 | * Change cipher spec protocol | |
964 | * just 1 byte needed, no need for keeping anything stored | |
965 | * Alert protocol | |
966 | * 2 bytes needed (AlertLevel, AlertDescription) | |
967 | * Handshake protocol | |
968 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
969 | * to detect unexpected Client Hello and Hello Request messages | |
970 | * here, anything else is handled by higher layers | |
971 | * Application data protocol | |
972 | * none of our business | |
973 | */ | |
5a4fbc69 | 974 | int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) |
0f113f3e MC |
975 | { |
976 | int al, i, j, ret; | |
977 | unsigned int n; | |
978 | SSL3_RECORD *rr; | |
979 | void (*cb) (const SSL *ssl, int type2, int val) = NULL; | |
980 | ||
88c23039 | 981 | if (!SSL3_BUFFER_is_initialised(&s->rlayer.rbuf)) { |
28d59af8 | 982 | /* Not initialized yet */ |
0f113f3e MC |
983 | if (!ssl3_setup_read_buffer(s)) |
984 | return (-1); | |
28d59af8 | 985 | } |
0f113f3e MC |
986 | |
987 | if ((type && (type != SSL3_RT_APPLICATION_DATA) | |
988 | && (type != SSL3_RT_HANDSHAKE)) || (peek | |
989 | && (type != | |
990 | SSL3_RT_APPLICATION_DATA))) { | |
991 | SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
992 | return -1; | |
993 | } | |
994 | ||
4aa7389e | 995 | if ((type == SSL3_RT_HANDSHAKE) && (s->rlayer.handshake_fragment_len > 0)) |
0f113f3e MC |
996 | /* (partially) satisfy request from storage */ |
997 | { | |
4aa7389e | 998 | unsigned char *src = s->rlayer.handshake_fragment; |
0f113f3e MC |
999 | unsigned char *dst = buf; |
1000 | unsigned int k; | |
1001 | ||
1002 | /* peek == 0 */ | |
1003 | n = 0; | |
4aa7389e | 1004 | while ((len > 0) && (s->rlayer.handshake_fragment_len > 0)) { |
0f113f3e MC |
1005 | *dst++ = *src++; |
1006 | len--; | |
4aa7389e | 1007 | s->rlayer.handshake_fragment_len--; |
0f113f3e MC |
1008 | n++; |
1009 | } | |
1010 | /* move any remaining fragment bytes: */ | |
4aa7389e MC |
1011 | for (k = 0; k < s->rlayer.handshake_fragment_len; k++) |
1012 | s->rlayer.handshake_fragment[k] = *src++; | |
0f113f3e MC |
1013 | return n; |
1014 | } | |
1015 | ||
1016 | /* | |
4aa7389e | 1017 | * Now s->rlayer.handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. |
0f113f3e MC |
1018 | */ |
1019 | ||
1020 | if (!s->in_handshake && SSL_in_init(s)) { | |
1021 | /* type == SSL3_RT_APPLICATION_DATA */ | |
1022 | i = s->handshake_func(s); | |
1023 | if (i < 0) | |
1024 | return (i); | |
1025 | if (i == 0) { | |
1026 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
1027 | return (-1); | |
1028 | } | |
1029 | } | |
1030 | start: | |
1031 | s->rwstate = SSL_NOTHING; | |
1032 | ||
50e735f9 MC |
1033 | /*- |
1034 | * s->s3->rrec.type - is the type of record | |
1035 | * s->s3->rrec.data, - data | |
1036 | * s->s3->rrec.off, - offset into 'data' for next read | |
1037 | * s->s3->rrec.length, - number of bytes. | |
1038 | */ | |
88c23039 | 1039 | rr = &s->rlayer.rrec; |
0f113f3e MC |
1040 | |
1041 | /* get new packet if necessary */ | |
295c3f41 | 1042 | if ((rr->length == 0) || (s->rlayer.rstate == SSL_ST_READ_BODY)) { |
0f113f3e MC |
1043 | ret = ssl3_get_record(s); |
1044 | if (ret <= 0) | |
1045 | return (ret); | |
1046 | } | |
1047 | ||
1048 | /* we now have a packet which can be read and processed */ | |
1049 | ||
1050 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, | |
1051 | * reset by ssl3_get_finished */ | |
1052 | && (rr->type != SSL3_RT_HANDSHAKE)) { | |
1053 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
1054 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_DATA_BETWEEN_CCS_AND_FINISHED); | |
1055 | goto f_err; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * If the other end has shut down, throw anything we read away (even in | |
1060 | * 'peek' mode) | |
1061 | */ | |
1062 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) { | |
1063 | rr->length = 0; | |
1064 | s->rwstate = SSL_NOTHING; | |
1065 | return (0); | |
1066 | } | |
1067 | ||
1068 | if (type == rr->type) { /* SSL3_RT_APPLICATION_DATA or | |
1069 | * SSL3_RT_HANDSHAKE */ | |
1070 | /* | |
1071 | * make sure that we are not getting application data when we are | |
1072 | * doing a handshake for the first time | |
1073 | */ | |
1074 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
1075 | (s->enc_read_ctx == NULL)) { | |
1076 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
1077 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE); | |
1078 | goto f_err; | |
1079 | } | |
1080 | ||
1081 | if (len <= 0) | |
1082 | return (len); | |
1083 | ||
1084 | if ((unsigned int)len > rr->length) | |
1085 | n = rr->length; | |
1086 | else | |
1087 | n = (unsigned int)len; | |
1088 | ||
1089 | memcpy(buf, &(rr->data[rr->off]), n); | |
1090 | if (!peek) { | |
1091 | rr->length -= n; | |
1092 | rr->off += n; | |
1093 | if (rr->length == 0) { | |
295c3f41 | 1094 | s->rlayer.rstate = SSL_ST_READ_HEADER; |
0f113f3e MC |
1095 | rr->off = 0; |
1096 | if (s->mode & SSL_MODE_RELEASE_BUFFERS | |
88c23039 | 1097 | && SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) |
0f113f3e MC |
1098 | ssl3_release_read_buffer(s); |
1099 | } | |
1100 | } | |
1101 | return (n); | |
1102 | } | |
1103 | ||
1104 | /* | |
1105 | * If we get here, then type != rr->type; if we have a handshake message, | |
1106 | * then it was unexpected (Hello Request or Client Hello). | |
1107 | */ | |
1108 | ||
1109 | /* | |
1110 | * In case of record types for which we have 'fragment' storage, fill | |
1111 | * that so that we can process the data at a fixed place. | |
1112 | */ | |
1113 | { | |
1114 | unsigned int dest_maxlen = 0; | |
1115 | unsigned char *dest = NULL; | |
1116 | unsigned int *dest_len = NULL; | |
1117 | ||
1118 | if (rr->type == SSL3_RT_HANDSHAKE) { | |
4aa7389e MC |
1119 | dest_maxlen = sizeof s->rlayer.handshake_fragment; |
1120 | dest = s->rlayer.handshake_fragment; | |
1121 | dest_len = &s->rlayer.handshake_fragment_len; | |
0f113f3e | 1122 | } else if (rr->type == SSL3_RT_ALERT) { |
4aa7389e MC |
1123 | dest_maxlen = sizeof s->rlayer.alert_fragment; |
1124 | dest = s->rlayer.alert_fragment; | |
1125 | dest_len = &s->rlayer.alert_fragment_len; | |
0f113f3e | 1126 | } |
4817504d | 1127 | #ifndef OPENSSL_NO_HEARTBEATS |
0f113f3e | 1128 | else if (rr->type == TLS1_RT_HEARTBEAT) { |
69f68237 | 1129 | /* We can ignore 0 return values */ |
2c60ed04 MC |
1130 | if(tls1_process_heartbeat(s, SSL3_RECORD_get_data(&s->rlayer.rrec), |
1131 | SSL3_RECORD_get_length(&s->rlayer.rrec)) < 0) { | |
69f68237 MC |
1132 | return -1; |
1133 | } | |
0f113f3e MC |
1134 | |
1135 | /* Exit and notify application to read again */ | |
1136 | rr->length = 0; | |
1137 | s->rwstate = SSL_READING; | |
1138 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
1139 | BIO_set_retry_read(SSL_get_rbio(s)); | |
1140 | return (-1); | |
1141 | } | |
4817504d | 1142 | #endif |
b35e9050 | 1143 | |
0f113f3e MC |
1144 | if (dest_maxlen > 0) { |
1145 | n = dest_maxlen - *dest_len; /* available space in 'dest' */ | |
1146 | if (rr->length < n) | |
1147 | n = rr->length; /* available bytes */ | |
1148 | ||
1149 | /* now move 'n' bytes: */ | |
1150 | while (n-- > 0) { | |
1151 | dest[(*dest_len)++] = rr->data[rr->off++]; | |
1152 | rr->length--; | |
1153 | } | |
1154 | ||
1155 | if (*dest_len < dest_maxlen) | |
1156 | goto start; /* fragment was too small */ | |
1157 | } | |
1158 | } | |
1159 | ||
50e735f9 | 1160 | /*- |
4aa7389e MC |
1161 | * s->rlayer.handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE; |
1162 | * s->rlayer.alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT. | |
50e735f9 MC |
1163 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) |
1164 | */ | |
0f113f3e MC |
1165 | |
1166 | /* If we are a client, check for an incoming 'Hello Request': */ | |
1167 | if ((!s->server) && | |
4aa7389e MC |
1168 | (s->rlayer.handshake_fragment_len >= 4) && |
1169 | (s->rlayer.handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && | |
0f113f3e | 1170 | (s->session != NULL) && (s->session->cipher != NULL)) { |
4aa7389e | 1171 | s->rlayer.handshake_fragment_len = 0; |
0f113f3e | 1172 | |
4aa7389e MC |
1173 | if ((s->rlayer.handshake_fragment[1] != 0) || |
1174 | (s->rlayer.handshake_fragment[2] != 0) || | |
1175 | (s->rlayer.handshake_fragment[3] != 0)) { | |
0f113f3e MC |
1176 | al = SSL_AD_DECODE_ERROR; |
1177 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_BAD_HELLO_REQUEST); | |
1178 | goto f_err; | |
1179 | } | |
1180 | ||
1181 | if (s->msg_callback) | |
1182 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
4aa7389e | 1183 | s->rlayer.handshake_fragment, 4, s, |
0f113f3e MC |
1184 | s->msg_callback_arg); |
1185 | ||
1186 | if (SSL_is_init_finished(s) && | |
1187 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && | |
1188 | !s->s3->renegotiate) { | |
1189 | ssl3_renegotiate(s); | |
1190 | if (ssl3_renegotiate_check(s)) { | |
1191 | i = s->handshake_func(s); | |
1192 | if (i < 0) | |
1193 | return (i); | |
1194 | if (i == 0) { | |
1195 | SSLerr(SSL_F_SSL3_READ_BYTES, | |
1196 | SSL_R_SSL_HANDSHAKE_FAILURE); | |
1197 | return (-1); | |
1198 | } | |
1199 | ||
1200 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 1201 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 1202 | /* no read-ahead left? */ |
0f113f3e MC |
1203 | BIO *bio; |
1204 | /* | |
1205 | * In the case where we try to read application data, | |
1206 | * but we trigger an SSL handshake, we return -1 with | |
1207 | * the retry option set. Otherwise renegotiation may | |
1208 | * cause nasty problems in the blocking world | |
1209 | */ | |
1210 | s->rwstate = SSL_READING; | |
1211 | bio = SSL_get_rbio(s); | |
1212 | BIO_clear_retry_flags(bio); | |
1213 | BIO_set_retry_read(bio); | |
1214 | return (-1); | |
1215 | } | |
1216 | } | |
1217 | } | |
1218 | } | |
1219 | /* | |
1220 | * we either finished a handshake or ignored the request, now try | |
1221 | * again to obtain the (application) data we were asked for | |
1222 | */ | |
1223 | goto start; | |
1224 | } | |
1225 | /* | |
1226 | * If we are a server and get a client hello when renegotiation isn't | |
1227 | * allowed send back a no renegotiation alert and carry on. WARNING: | |
1228 | * experimental code, needs reviewing (steve) | |
1229 | */ | |
1230 | if (s->server && | |
1231 | SSL_is_init_finished(s) && | |
1232 | !s->s3->send_connection_binding && | |
1233 | (s->version > SSL3_VERSION) && | |
4aa7389e MC |
1234 | (s->rlayer.handshake_fragment_len >= 4) && |
1235 | (s->rlayer.handshake_fragment[0] == SSL3_MT_CLIENT_HELLO) && | |
0f113f3e MC |
1236 | (s->session != NULL) && (s->session->cipher != NULL) && |
1237 | !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) { | |
0f113f3e MC |
1238 | rr->length = 0; |
1239 | ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION); | |
1240 | goto start; | |
1241 | } | |
4aa7389e MC |
1242 | if (s->rlayer.alert_fragment_len >= 2) { |
1243 | int alert_level = s->rlayer.alert_fragment[0]; | |
1244 | int alert_descr = s->rlayer.alert_fragment[1]; | |
0f113f3e | 1245 | |
4aa7389e | 1246 | s->rlayer.alert_fragment_len = 0; |
0f113f3e MC |
1247 | |
1248 | if (s->msg_callback) | |
1249 | s->msg_callback(0, s->version, SSL3_RT_ALERT, | |
4aa7389e MC |
1250 | s->rlayer.alert_fragment, 2, s, |
1251 | s->msg_callback_arg); | |
0f113f3e MC |
1252 | |
1253 | if (s->info_callback != NULL) | |
1254 | cb = s->info_callback; | |
1255 | else if (s->ctx->info_callback != NULL) | |
1256 | cb = s->ctx->info_callback; | |
1257 | ||
1258 | if (cb != NULL) { | |
1259 | j = (alert_level << 8) | alert_descr; | |
1260 | cb(s, SSL_CB_READ_ALERT, j); | |
1261 | } | |
1262 | ||
fd865cad | 1263 | if (alert_level == SSL3_AL_WARNING) { |
0f113f3e MC |
1264 | s->s3->warn_alert = alert_descr; |
1265 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) { | |
1266 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
1267 | return (0); | |
1268 | } | |
1269 | /* | |
1270 | * This is a warning but we receive it if we requested | |
1271 | * renegotiation and the peer denied it. Terminate with a fatal | |
1272 | * alert because if application tried to renegotiatie it | |
1273 | * presumably had a good reason and expects it to succeed. In | |
1274 | * future we might have a renegotiation where we don't care if | |
1275 | * the peer refused it where we carry on. | |
1276 | */ | |
1277 | else if (alert_descr == SSL_AD_NO_RENEGOTIATION) { | |
1278 | al = SSL_AD_HANDSHAKE_FAILURE; | |
1279 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_NO_RENEGOTIATION); | |
1280 | goto f_err; | |
1281 | } | |
edc032b5 | 1282 | #ifdef SSL_AD_MISSING_SRP_USERNAME |
0f113f3e MC |
1283 | else if (alert_descr == SSL_AD_MISSING_SRP_USERNAME) |
1284 | return (0); | |
edc032b5 | 1285 | #endif |
fd865cad | 1286 | } else if (alert_level == SSL3_AL_FATAL) { |
0f113f3e MC |
1287 | char tmp[16]; |
1288 | ||
1289 | s->rwstate = SSL_NOTHING; | |
1290 | s->s3->fatal_alert = alert_descr; | |
1291 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); | |
1292 | BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr); | |
1293 | ERR_add_error_data(2, "SSL alert number ", tmp); | |
1294 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; | |
1295 | SSL_CTX_remove_session(s->ctx, s->session); | |
1296 | return (0); | |
1297 | } else { | |
1298 | al = SSL_AD_ILLEGAL_PARAMETER; | |
1299 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE); | |
1300 | goto f_err; | |
1301 | } | |
1302 | ||
1303 | goto start; | |
1304 | } | |
1305 | ||
1306 | if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a | |
1307 | * shutdown */ | |
1308 | s->rwstate = SSL_NOTHING; | |
1309 | rr->length = 0; | |
1310 | return (0); | |
1311 | } | |
1312 | ||
1313 | if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) { | |
1314 | /* | |
1315 | * 'Change Cipher Spec' is just a single byte, so we know exactly | |
1316 | * what the record payload has to look like | |
1317 | */ | |
1318 | if ((rr->length != 1) || (rr->off != 0) || | |
1319 | (rr->data[0] != SSL3_MT_CCS)) { | |
1320 | al = SSL_AD_ILLEGAL_PARAMETER; | |
1321 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_BAD_CHANGE_CIPHER_SPEC); | |
1322 | goto f_err; | |
1323 | } | |
1324 | ||
1325 | /* Check we have a cipher to change to */ | |
1326 | if (s->s3->tmp.new_cipher == NULL) { | |
1327 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
1328 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_CCS_RECEIVED_EARLY); | |
1329 | goto f_err; | |
1330 | } | |
1331 | ||
1332 | if (!(s->s3->flags & SSL3_FLAGS_CCS_OK)) { | |
1333 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
1334 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_CCS_RECEIVED_EARLY); | |
1335 | goto f_err; | |
1336 | } | |
1337 | ||
1338 | s->s3->flags &= ~SSL3_FLAGS_CCS_OK; | |
1339 | ||
1340 | rr->length = 0; | |
1341 | ||
1342 | if (s->msg_callback) | |
1343 | s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, | |
1344 | rr->data, 1, s, s->msg_callback_arg); | |
1345 | ||
1346 | s->s3->change_cipher_spec = 1; | |
1347 | if (!ssl3_do_change_cipher_spec(s)) | |
1348 | goto err; | |
1349 | else | |
1350 | goto start; | |
1351 | } | |
1352 | ||
1353 | /* | |
1354 | * Unexpected handshake message (Client Hello, or protocol violation) | |
1355 | */ | |
4aa7389e | 1356 | if ((s->rlayer.handshake_fragment_len >= 4) && !s->in_handshake) { |
0f113f3e MC |
1357 | if (((s->state & SSL_ST_MASK) == SSL_ST_OK) && |
1358 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) { | |
0f113f3e | 1359 | s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; |
0f113f3e MC |
1360 | s->renegotiate = 1; |
1361 | s->new_session = 1; | |
1362 | } | |
1363 | i = s->handshake_func(s); | |
1364 | if (i < 0) | |
1365 | return (i); | |
1366 | if (i == 0) { | |
1367 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); | |
1368 | return (-1); | |
1369 | } | |
1370 | ||
1371 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) { | |
88c23039 | 1372 | if (SSL3_BUFFER_get_left(&s->rlayer.rbuf) == 0) { |
28d59af8 | 1373 | /* no read-ahead left? */ |
0f113f3e MC |
1374 | BIO *bio; |
1375 | /* | |
1376 | * In the case where we try to read application data, but we | |
1377 | * trigger an SSL handshake, we return -1 with the retry | |
1378 | * option set. Otherwise renegotiation may cause nasty | |
1379 | * problems in the blocking world | |
1380 | */ | |
1381 | s->rwstate = SSL_READING; | |
1382 | bio = SSL_get_rbio(s); | |
1383 | BIO_clear_retry_flags(bio); | |
1384 | BIO_set_retry_read(bio); | |
1385 | return (-1); | |
1386 | } | |
1387 | } | |
1388 | goto start; | |
1389 | } | |
1390 | ||
1391 | switch (rr->type) { | |
1392 | default: | |
0f113f3e MC |
1393 | /* |
1394 | * TLS up to v1.1 just ignores unknown message types: TLS v1.2 give | |
1395 | * an unexpected message alert. | |
1396 | */ | |
1397 | if (s->version >= TLS1_VERSION && s->version <= TLS1_1_VERSION) { | |
1398 | rr->length = 0; | |
1399 | goto start; | |
1400 | } | |
0f113f3e MC |
1401 | al = SSL_AD_UNEXPECTED_MESSAGE; |
1402 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
1403 | goto f_err; | |
1404 | case SSL3_RT_CHANGE_CIPHER_SPEC: | |
1405 | case SSL3_RT_ALERT: | |
1406 | case SSL3_RT_HANDSHAKE: | |
1407 | /* | |
1408 | * we already handled all of these, with the possible exception of | |
1409 | * SSL3_RT_HANDSHAKE when s->in_handshake is set, but that should not | |
1410 | * happen when type != rr->type | |
1411 | */ | |
1412 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
1413 | SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR); | |
1414 | goto f_err; | |
1415 | case SSL3_RT_APPLICATION_DATA: | |
1416 | /* | |
1417 | * At this point, we were expecting handshake data, but have | |
1418 | * application data. If the library was running inside ssl3_read() | |
1419 | * (i.e. in_read_app_data is set) and it makes sense to read | |
1420 | * application data at this point (session renegotiation not yet | |
1421 | * started), we will indulge it. | |
1422 | */ | |
1423 | if (s->s3->in_read_app_data && | |
1424 | (s->s3->total_renegotiations != 0) && | |
1425 | (((s->state & SSL_ST_CONNECT) && | |
1426 | (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && | |
1427 | (s->state <= SSL3_ST_CR_SRVR_HELLO_A) | |
1428 | ) || ((s->state & SSL_ST_ACCEPT) && | |
1429 | (s->state <= SSL3_ST_SW_HELLO_REQ_A) && | |
1430 | (s->state >= SSL3_ST_SR_CLNT_HELLO_A) | |
1431 | ) | |
1432 | )) { | |
1433 | s->s3->in_read_app_data = 2; | |
1434 | return (-1); | |
1435 | } else { | |
1436 | al = SSL_AD_UNEXPECTED_MESSAGE; | |
1437 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_UNEXPECTED_RECORD); | |
1438 | goto f_err; | |
1439 | } | |
1440 | } | |
1441 | /* not reached */ | |
1442 | ||
1443 | f_err: | |
1444 | ssl3_send_alert(s, SSL3_AL_FATAL, al); | |
1445 | err: | |
1446 | return (-1); | |
1447 | } | |
d02b48c6 | 1448 | |
14daae5a MC |
1449 | void ssl3_record_sequence_update(unsigned char *seq) |
1450 | { | |
1451 | int i; | |
1452 | ||
1453 | for (i = 7; i >= 0; i--) { | |
1454 | ++seq[i]; | |
1455 | if (seq[i] != 0) | |
1456 | break; | |
1457 | } | |
1458 | } | |
1459 | ||
0f113f3e | 1460 |