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36d16f8e BL |
1 | /* ssl/d1_both.c */ |
2 | /* | |
3 | * DTLS implementation written by Nagendra Modadugu | |
4 | * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. | |
5 | */ | |
6 | /* ==================================================================== | |
7 | * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
90acf770 | 14 | * notice, this list of conditions and the following disclaimer. |
36d16f8e BL |
15 | * |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
90acf770 AP |
17 | * notice, this list of conditions and the following disclaimer in |
18 | * the documentation and/or other materials provided with the | |
19 | * distribution. | |
36d16f8e BL |
20 | * |
21 | * 3. All advertising materials mentioning features or use of this | |
90acf770 AP |
22 | * software must display the following acknowledgment: |
23 | * "This product includes software developed by the OpenSSL Project | |
24 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
36d16f8e BL |
25 | * |
26 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
90acf770 AP |
27 | * endorse or promote products derived from this software without |
28 | * prior written permission. For written permission, please contact | |
29 | * openssl-core@openssl.org. | |
36d16f8e BL |
30 | * |
31 | * 5. Products derived from this software may not be called "OpenSSL" | |
90acf770 AP |
32 | * nor may "OpenSSL" appear in their names without prior written |
33 | * permission of the OpenSSL Project. | |
36d16f8e BL |
34 | * |
35 | * 6. Redistributions of any form whatsoever must retain the following | |
90acf770 AP |
36 | * acknowledgment: |
37 | * "This product includes software developed by the OpenSSL Project | |
38 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
36d16f8e BL |
39 | * |
40 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
41 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
43 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
44 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
45 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
47 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
49 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
50 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
51 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
52 | * ==================================================================== | |
53 | * | |
54 | * This product includes cryptographic software written by Eric Young | |
55 | * (eay@cryptsoft.com). This product includes software written by Tim | |
56 | * Hudson (tjh@cryptsoft.com). | |
57 | * | |
58 | */ | |
59 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
60 | * All rights reserved. | |
61 | * | |
62 | * This package is an SSL implementation written | |
63 | * by Eric Young (eay@cryptsoft.com). | |
64 | * The implementation was written so as to conform with Netscapes SSL. | |
65 | * | |
66 | * This library is free for commercial and non-commercial use as long as | |
67 | * the following conditions are aheared to. The following conditions | |
68 | * apply to all code found in this distribution, be it the RC4, RSA, | |
69 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
70 | * included with this distribution is covered by the same copyright terms | |
71 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
72 | * | |
73 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
74 | * the code are not to be removed. | |
75 | * If this package is used in a product, Eric Young should be given attribution | |
76 | * as the author of the parts of the library used. | |
77 | * This can be in the form of a textual message at program startup or | |
78 | * in documentation (online or textual) provided with the package. | |
79 | * | |
80 | * Redistribution and use in source and binary forms, with or without | |
81 | * modification, are permitted provided that the following conditions | |
82 | * are met: | |
83 | * 1. Redistributions of source code must retain the copyright | |
90acf770 | 84 | * notice, this list of conditions and the following disclaimer. |
36d16f8e | 85 | * 2. Redistributions in binary form must reproduce the above copyright |
90acf770 AP |
86 | * notice, this list of conditions and the following disclaimer in the |
87 | * documentation and/or other materials provided with the distribution. | |
36d16f8e | 88 | * 3. All advertising materials mentioning features or use of this software |
90acf770 AP |
89 | * must display the following acknowledgement: |
90 | * "This product includes cryptographic software written by | |
91 | * Eric Young (eay@cryptsoft.com)" | |
92 | * The word 'cryptographic' can be left out if the rouines from the library | |
93 | * being used are not cryptographic related :-). | |
36d16f8e | 94 | * 4. If you include any Windows specific code (or a derivative thereof) from |
90acf770 AP |
95 | * the apps directory (application code) you must include an acknowledgement: |
96 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
36d16f8e BL |
97 | * |
98 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
99 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
100 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
101 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
102 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
103 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
104 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
105 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
106 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
107 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
108 | * SUCH DAMAGE. | |
109 | * | |
110 | * The licence and distribution terms for any publically available version or | |
111 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
112 | * copied and put under another distribution licence | |
113 | * [including the GNU Public Licence.] | |
114 | */ | |
115 | ||
116 | #include <limits.h> | |
117 | #include <string.h> | |
118 | #include <stdio.h> | |
119 | #include "ssl_locl.h" | |
120 | #include <openssl/buffer.h> | |
121 | #include <openssl/rand.h> | |
122 | #include <openssl/objects.h> | |
123 | #include <openssl/evp.h> | |
124 | #include <openssl/x509.h> | |
125 | ||
934e22e8 DSH |
126 | #define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8) |
127 | ||
128 | #define RSMBLY_BITMASK_MARK(bitmask, start, end) { \ | |
129 | if ((end) - (start) <= 8) { \ | |
6006ae14 | 130 | long ii; \ |
934e22e8 DSH |
131 | for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \ |
132 | } else { \ | |
6006ae14 | 133 | long ii; \ |
934e22e8 | 134 | bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \ |
6006ae14 DSH |
135 | for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \ |
136 | bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \ | |
934e22e8 DSH |
137 | } } |
138 | ||
139 | #define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \ | |
6006ae14 DSH |
140 | long ii; \ |
141 | OPENSSL_assert((msg_len) > 0); \ | |
934e22e8 | 142 | is_complete = 1; \ |
6006ae14 DSH |
143 | if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \ |
144 | if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \ | |
145 | if (bitmask[ii] != 0xff) { is_complete = 0; break; } } | |
934e22e8 DSH |
146 | |
147 | #if 0 | |
148 | #define RSMBLY_BITMASK_PRINT(bitmask, msg_len) { \ | |
6006ae14 | 149 | long ii; \ |
934e22e8 DSH |
150 | printf("bitmask: "); for (ii = 0; ii < (msg_len); ii++) \ |
151 | printf("%d ", (bitmask[ii >> 3] & (1 << (ii & 7))) >> (ii & 7)); \ | |
152 | printf("\n"); } | |
153 | #endif | |
154 | ||
155 | static unsigned char bitmask_start_values[] = {0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80}; | |
6e28b60a | 156 | static unsigned char bitmask_end_values[] = {0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f}; |
36d16f8e BL |
157 | |
158 | /* XDTLS: figure out the right values */ | |
159 | static unsigned int g_probable_mtu[] = {1500 - 28, 512 - 28, 256 - 28}; | |
160 | ||
36d16f8e BL |
161 | static unsigned int dtls1_guess_mtu(unsigned int curr_mtu); |
162 | static void dtls1_fix_message_header(SSL *s, unsigned long frag_off, | |
163 | unsigned long frag_len); | |
164 | static unsigned char *dtls1_write_message_header(SSL *s, | |
165 | unsigned char *p); | |
166 | static void dtls1_set_message_header_int(SSL *s, unsigned char mt, | |
167 | unsigned long len, unsigned short seq_num, unsigned long frag_off, | |
168 | unsigned long frag_len); | |
36d16f8e | 169 | static long dtls1_get_message_fragment(SSL *s, int st1, int stn, |
54ef01b5 | 170 | long max, int *ok); |
36d16f8e BL |
171 | |
172 | static hm_fragment * | |
934e22e8 | 173 | dtls1_hm_fragment_new(unsigned long frag_len, int reassembly) |
54ef01b5 AP |
174 | { |
175 | hm_fragment *frag = NULL; | |
176 | unsigned char *buf = NULL; | |
934e22e8 | 177 | unsigned char *bitmask = NULL; |
54ef01b5 AP |
178 | |
179 | frag = (hm_fragment *)OPENSSL_malloc(sizeof(hm_fragment)); | |
180 | if ( frag == NULL) | |
181 | return NULL; | |
182 | ||
90acf770 | 183 | if (frag_len) |
54ef01b5 | 184 | { |
90acf770 AP |
185 | buf = (unsigned char *)OPENSSL_malloc(frag_len); |
186 | if ( buf == NULL) | |
187 | { | |
188 | OPENSSL_free(frag); | |
189 | return NULL; | |
190 | } | |
54ef01b5 AP |
191 | } |
192 | ||
90acf770 | 193 | /* zero length fragment gets zero frag->fragment */ |
54ef01b5 AP |
194 | frag->fragment = buf; |
195 | ||
934e22e8 DSH |
196 | /* Initialize reassembly bitmask if necessary */ |
197 | if (reassembly) | |
198 | { | |
199 | bitmask = (unsigned char *)OPENSSL_malloc(RSMBLY_BITMASK_SIZE(frag_len)); | |
200 | if (bitmask == NULL) | |
201 | { | |
202 | if (buf != NULL) OPENSSL_free(buf); | |
203 | OPENSSL_free(frag); | |
204 | return NULL; | |
205 | } | |
206 | memset(bitmask, 0, RSMBLY_BITMASK_SIZE(frag_len)); | |
207 | } | |
208 | ||
209 | frag->reassembly = bitmask; | |
210 | ||
54ef01b5 AP |
211 | return frag; |
212 | } | |
36d16f8e BL |
213 | |
214 | static void | |
215 | dtls1_hm_fragment_free(hm_fragment *frag) | |
54ef01b5 | 216 | { |
90acf770 | 217 | if (frag->fragment) OPENSSL_free(frag->fragment); |
934e22e8 | 218 | if (frag->reassembly) OPENSSL_free(frag->reassembly); |
54ef01b5 AP |
219 | OPENSSL_free(frag); |
220 | } | |
36d16f8e BL |
221 | |
222 | /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */ | |
223 | int dtls1_do_write(SSL *s, int type) | |
224 | { | |
225 | int ret; | |
226 | int curr_mtu; | |
71af26b5 | 227 | unsigned int len, frag_off, mac_size, blocksize; |
36d16f8e BL |
228 | |
229 | /* AHA! Figure out the MTU, and stick to the right size */ | |
230 | if ( ! (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) | |
54ef01b5 | 231 | { |
36d16f8e BL |
232 | s->d1->mtu = |
233 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); | |
234 | ||
235 | /* I've seen the kernel return bogus numbers when it doesn't know | |
236 | * (initial write), so just make sure we have a reasonable number */ | |
237 | if ( s->d1->mtu < dtls1_min_mtu()) | |
238 | { | |
239 | s->d1->mtu = 0; | |
240 | s->d1->mtu = dtls1_guess_mtu(s->d1->mtu); | |
241 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU, | |
242 | s->d1->mtu, NULL); | |
243 | } | |
244 | } | |
245 | #if 0 | |
246 | mtu = s->d1->mtu; | |
247 | ||
248 | fprintf(stderr, "using MTU = %d\n", mtu); | |
249 | ||
250 | mtu -= (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH); | |
251 | ||
252 | curr_mtu = mtu - BIO_wpending(SSL_get_wbio(s)); | |
253 | ||
254 | if ( curr_mtu > 0) | |
255 | mtu = curr_mtu; | |
256 | else if ( ( ret = BIO_flush(SSL_get_wbio(s))) <= 0) | |
257 | return ret; | |
54ef01b5 | 258 | |
36d16f8e BL |
259 | if ( BIO_wpending(SSL_get_wbio(s)) + s->init_num >= mtu) |
260 | { | |
261 | ret = BIO_flush(SSL_get_wbio(s)); | |
262 | if ( ret <= 0) | |
263 | return ret; | |
264 | mtu = s->d1->mtu - (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH); | |
265 | } | |
36d16f8e BL |
266 | #endif |
267 | ||
1d7392f2 DSH |
268 | OPENSSL_assert(s->d1->mtu >= dtls1_min_mtu()); /* should have something reasonable now */ |
269 | ||
36d16f8e BL |
270 | if ( s->init_off == 0 && type == SSL3_RT_HANDSHAKE) |
271 | OPENSSL_assert(s->init_num == | |
6c61726b | 272 | (int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH); |
36d16f8e | 273 | |
71af26b5 DSH |
274 | if (s->write_hash) |
275 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
276 | else | |
277 | mac_size = 0; | |
278 | ||
279 | if (s->enc_write_ctx && | |
280 | (EVP_CIPHER_mode( s->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE)) | |
281 | blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher); | |
282 | else | |
283 | blocksize = 0; | |
284 | ||
36d16f8e BL |
285 | frag_off = 0; |
286 | while( s->init_num) | |
287 | { | |
288 | curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) - | |
71af26b5 | 289 | DTLS1_RT_HEADER_LENGTH - mac_size - blocksize; |
36d16f8e BL |
290 | |
291 | if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH) | |
292 | { | |
293 | /* grr.. we could get an error if MTU picked was wrong */ | |
294 | ret = BIO_flush(SSL_get_wbio(s)); | |
295 | if ( ret <= 0) | |
296 | return ret; | |
71af26b5 DSH |
297 | curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH - |
298 | mac_size - blocksize; | |
36d16f8e BL |
299 | } |
300 | ||
301 | if ( s->init_num > curr_mtu) | |
302 | len = curr_mtu; | |
303 | else | |
304 | len = s->init_num; | |
305 | ||
306 | ||
307 | /* XDTLS: this function is too long. split out the CCS part */ | |
308 | if ( type == SSL3_RT_HANDSHAKE) | |
309 | { | |
310 | if ( s->init_off != 0) | |
311 | { | |
312 | OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH); | |
313 | s->init_off -= DTLS1_HM_HEADER_LENGTH; | |
314 | s->init_num += DTLS1_HM_HEADER_LENGTH; | |
315 | ||
54ef01b5 | 316 | /* write atleast DTLS1_HM_HEADER_LENGTH bytes */ |
36d16f8e BL |
317 | if ( len <= DTLS1_HM_HEADER_LENGTH) |
318 | len += DTLS1_HM_HEADER_LENGTH; | |
319 | } | |
54ef01b5 | 320 | |
36d16f8e BL |
321 | dtls1_fix_message_header(s, frag_off, |
322 | len - DTLS1_HM_HEADER_LENGTH); | |
323 | ||
4e321ffa | 324 | dtls1_write_message_header(s, (unsigned char *)&s->init_buf->data[s->init_off]); |
36d16f8e BL |
325 | |
326 | OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH); | |
327 | } | |
328 | ||
329 | ret=dtls1_write_bytes(s,type,&s->init_buf->data[s->init_off], | |
330 | len); | |
331 | if (ret < 0) | |
332 | { | |
333 | /* might need to update MTU here, but we don't know | |
334 | * which previous packet caused the failure -- so can't | |
335 | * really retransmit anything. continue as if everything | |
336 | * is fine and wait for an alert to handle the | |
337 | * retransmit | |
338 | */ | |
339 | if ( BIO_ctrl(SSL_get_wbio(s), | |
ff613640 | 340 | BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0 ) |
36d16f8e BL |
341 | s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), |
342 | BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); | |
343 | else | |
344 | return(-1); | |
345 | } | |
346 | else | |
347 | { | |
54ef01b5 | 348 | |
36d16f8e BL |
349 | /* bad if this assert fails, only part of the handshake |
350 | * message got sent. but why would this happen? */ | |
90acf770 | 351 | OPENSSL_assert(len == (unsigned int)ret); |
54ef01b5 | 352 | |
36d16f8e | 353 | if (type == SSL3_RT_HANDSHAKE && ! s->d1->retransmitting) |
90acf770 | 354 | { |
36d16f8e BL |
355 | /* should not be done for 'Hello Request's, but in that case |
356 | * we'll ignore the result anyway */ | |
e979c039 | 357 | unsigned char *p = (unsigned char *)&s->init_buf->data[s->init_off]; |
90acf770 | 358 | const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; |
e979c039 | 359 | int xlen; |
90acf770 | 360 | |
8711efb4 | 361 | if (frag_off == 0 && s->version != DTLS1_BAD_VER) |
90acf770 AP |
362 | { |
363 | /* reconstruct message header is if it | |
364 | * is being sent in single fragment */ | |
365 | *p++ = msg_hdr->type; | |
366 | l2n3(msg_hdr->msg_len,p); | |
367 | s2n (msg_hdr->seq,p); | |
368 | l2n3(0,p); | |
369 | l2n3(msg_hdr->msg_len,p); | |
370 | p -= DTLS1_HM_HEADER_LENGTH; | |
e979c039 | 371 | xlen = ret; |
90acf770 AP |
372 | } |
373 | else | |
374 | { | |
375 | p += DTLS1_HM_HEADER_LENGTH; | |
e979c039 | 376 | xlen = ret - DTLS1_HM_HEADER_LENGTH; |
90acf770 AP |
377 | } |
378 | ||
e979c039 | 379 | ssl3_finish_mac(s, p, xlen); |
90acf770 AP |
380 | } |
381 | ||
36d16f8e BL |
382 | if (ret == s->init_num) |
383 | { | |
384 | if (s->msg_callback) | |
385 | s->msg_callback(1, s->version, type, s->init_buf->data, | |
386 | (size_t)(s->init_off + s->init_num), s, | |
387 | s->msg_callback_arg); | |
388 | ||
389 | s->init_off = 0; /* done writing this message */ | |
390 | s->init_num = 0; | |
90acf770 | 391 | |
36d16f8e BL |
392 | return(1); |
393 | } | |
394 | s->init_off+=ret; | |
395 | s->init_num-=ret; | |
396 | frag_off += (ret -= DTLS1_HM_HEADER_LENGTH); | |
397 | } | |
398 | } | |
399 | return(0); | |
400 | } | |
401 | ||
402 | ||
403 | /* Obtain handshake message of message type 'mt' (any if mt == -1), | |
404 | * maximum acceptable body length 'max'. | |
405 | * Read an entire handshake message. Handshake messages arrive in | |
406 | * fragments. | |
407 | */ | |
beb056b3 | 408 | long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok) |
36d16f8e BL |
409 | { |
410 | int i, al; | |
90acf770 | 411 | struct hm_header_st *msg_hdr; |
934e22e8 DSH |
412 | unsigned char *p; |
413 | unsigned long msg_len; | |
36d16f8e BL |
414 | |
415 | /* s3->tmp is used to store messages that are unexpected, caused | |
416 | * by the absence of an optional handshake message */ | |
417 | if (s->s3->tmp.reuse_message) | |
418 | { | |
419 | s->s3->tmp.reuse_message=0; | |
420 | if ((mt >= 0) && (s->s3->tmp.message_type != mt)) | |
421 | { | |
422 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
beb056b3 | 423 | SSLerr(SSL_F_DTLS1_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE); |
36d16f8e BL |
424 | goto f_err; |
425 | } | |
426 | *ok=1; | |
427 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
428 | s->init_num = (int)s->s3->tmp.message_size; | |
429 | return s->init_num; | |
430 | } | |
54ef01b5 | 431 | |
90acf770 | 432 | msg_hdr = &s->d1->r_msg_hdr; |
934e22e8 DSH |
433 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); |
434 | ||
435 | again: | |
436 | i = dtls1_get_message_fragment(s, st1, stn, max, ok); | |
437 | if ( i == DTLS1_HM_BAD_FRAGMENT || | |
438 | i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */ | |
439 | goto again; | |
440 | else if ( i <= 0 && !*ok) | |
441 | return i; | |
36d16f8e | 442 | |
934e22e8 DSH |
443 | p = (unsigned char *)s->init_buf->data; |
444 | msg_len = msg_hdr->msg_len; | |
445 | ||
446 | /* reconstruct message header */ | |
447 | *(p++) = msg_hdr->type; | |
448 | l2n3(msg_len,p); | |
449 | s2n (msg_hdr->seq,p); | |
450 | l2n3(0,p); | |
451 | l2n3(msg_len,p); | |
452 | if (s->version != DTLS1_BAD_VER) { | |
453 | p -= DTLS1_HM_HEADER_LENGTH; | |
454 | msg_len += DTLS1_HM_HEADER_LENGTH; | |
455 | } | |
36d16f8e | 456 | |
934e22e8 DSH |
457 | ssl3_finish_mac(s, p, msg_len); |
458 | if (s->msg_callback) | |
459 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
460 | p, msg_len, | |
461 | s, s->msg_callback_arg); | |
462 | ||
463 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
464 | ||
f74a0c0c DSH |
465 | /* Don't change sequence numbers while listening */ |
466 | if (!s->d1->listen) | |
467 | s->d1->handshake_read_seq++; | |
468 | ||
934e22e8 DSH |
469 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; |
470 | return s->init_num; | |
36d16f8e BL |
471 | |
472 | f_err: | |
473 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
474 | *ok = 0; | |
475 | return -1; | |
476 | } | |
477 | ||
478 | ||
90acf770 AP |
479 | static int dtls1_preprocess_fragment(SSL *s,struct hm_header_st *msg_hdr,int max) |
480 | { | |
481 | size_t frag_off,frag_len,msg_len; | |
482 | ||
483 | msg_len = msg_hdr->msg_len; | |
484 | frag_off = msg_hdr->frag_off; | |
485 | frag_len = msg_hdr->frag_len; | |
486 | ||
487 | /* sanity checking */ | |
488 | if ( (frag_off+frag_len) > msg_len) | |
489 | { | |
490 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
491 | return SSL_AD_ILLEGAL_PARAMETER; | |
492 | } | |
493 | ||
494 | if ( (frag_off+frag_len) > (unsigned long)max) | |
495 | { | |
496 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
497 | return SSL_AD_ILLEGAL_PARAMETER; | |
498 | } | |
499 | ||
500 | if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */ | |
501 | { | |
502 | /* msg_len is limited to 2^24, but is effectively checked | |
503 | * against max above */ | |
504 | if (!BUF_MEM_grow_clean(s->init_buf,msg_len+DTLS1_HM_HEADER_LENGTH)) | |
505 | { | |
506 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,ERR_R_BUF_LIB); | |
507 | return SSL_AD_INTERNAL_ERROR; | |
508 | } | |
509 | ||
510 | s->s3->tmp.message_size = msg_len; | |
511 | s->d1->r_msg_hdr.msg_len = msg_len; | |
512 | s->s3->tmp.message_type = msg_hdr->type; | |
513 | s->d1->r_msg_hdr.type = msg_hdr->type; | |
514 | s->d1->r_msg_hdr.seq = msg_hdr->seq; | |
515 | } | |
516 | else if (msg_len != s->d1->r_msg_hdr.msg_len) | |
517 | { | |
518 | /* They must be playing with us! BTW, failure to enforce | |
519 | * upper limit would open possibility for buffer overrun. */ | |
520 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
521 | return SSL_AD_ILLEGAL_PARAMETER; | |
522 | } | |
523 | ||
524 | return 0; /* no error */ | |
525 | } | |
526 | ||
527 | ||
36d16f8e | 528 | static int |
90acf770 | 529 | dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok) |
54ef01b5 AP |
530 | { |
531 | /* (0) check whether the desired fragment is available | |
532 | * if so: | |
533 | * (1) copy over the fragment to s->init_buf->data[] | |
534 | * (2) update s->init_num | |
535 | */ | |
536 | pitem *item; | |
537 | hm_fragment *frag; | |
90acf770 | 538 | int al; |
54ef01b5 | 539 | |
90acf770 | 540 | *ok = 0; |
54ef01b5 AP |
541 | item = pqueue_peek(s->d1->buffered_messages); |
542 | if ( item == NULL) | |
543 | return 0; | |
544 | ||
545 | frag = (hm_fragment *)item->data; | |
934e22e8 DSH |
546 | |
547 | /* Don't return if reassembly still in progress */ | |
548 | if (frag->reassembly != NULL) | |
549 | return 0; | |
54ef01b5 | 550 | |
90acf770 | 551 | if ( s->d1->handshake_read_seq == frag->msg_header.seq) |
54ef01b5 | 552 | { |
715feb31 | 553 | unsigned long frag_len = frag->msg_header.frag_len; |
54ef01b5 | 554 | pqueue_pop(s->d1->buffered_messages); |
54ef01b5 | 555 | |
90acf770 AP |
556 | al=dtls1_preprocess_fragment(s,&frag->msg_header,max); |
557 | ||
558 | if (al==0) /* no alert */ | |
559 | { | |
e979c039 | 560 | unsigned char *p = (unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH; |
90acf770 AP |
561 | memcpy(&p[frag->msg_header.frag_off], |
562 | frag->fragment,frag->msg_header.frag_len); | |
563 | } | |
54ef01b5 | 564 | |
90acf770 | 565 | dtls1_hm_fragment_free(frag); |
54ef01b5 AP |
566 | pitem_free(item); |
567 | ||
90acf770 AP |
568 | if (al==0) |
569 | { | |
570 | *ok = 1; | |
715feb31 | 571 | return frag_len; |
90acf770 AP |
572 | } |
573 | ||
574 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
575 | s->init_num = 0; | |
576 | *ok = 0; | |
577 | return -1; | |
54ef01b5 AP |
578 | } |
579 | else | |
580 | return 0; | |
581 | } | |
36d16f8e BL |
582 | |
583 | ||
934e22e8 DSH |
584 | static int |
585 | dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok) | |
586 | { | |
587 | hm_fragment *frag = NULL; | |
588 | pitem *item = NULL; | |
589 | int i = -1, is_complete; | |
590 | unsigned char seq64be[8]; | |
591 | unsigned long frag_len = msg_hdr->frag_len, max_len; | |
592 | ||
593 | if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len) | |
594 | goto err; | |
595 | ||
596 | /* Determine maximum allowed message size. Depends on (user set) | |
597 | * maximum certificate length, but 16k is minimum. | |
598 | */ | |
599 | if (DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH < s->max_cert_list) | |
600 | max_len = s->max_cert_list; | |
601 | else | |
602 | max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH; | |
603 | ||
604 | if ((msg_hdr->frag_off+frag_len) > max_len) | |
605 | goto err; | |
606 | ||
607 | /* Try to find item in queue */ | |
608 | memset(seq64be,0,sizeof(seq64be)); | |
609 | seq64be[6] = (unsigned char) (msg_hdr->seq>>8); | |
610 | seq64be[7] = (unsigned char) msg_hdr->seq; | |
611 | item = pqueue_find(s->d1->buffered_messages, seq64be); | |
612 | ||
613 | if (item == NULL) | |
614 | { | |
615 | frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1); | |
616 | if ( frag == NULL) | |
617 | goto err; | |
618 | memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); | |
619 | frag->msg_header.frag_len = frag->msg_header.msg_len; | |
620 | frag->msg_header.frag_off = 0; | |
621 | } | |
622 | else | |
623 | frag = (hm_fragment*) item->data; | |
624 | ||
625 | /* If message is already reassembled, this must be a | |
626 | * retransmit and can be dropped. | |
627 | */ | |
628 | if (frag->reassembly == NULL) | |
629 | { | |
630 | unsigned char devnull [256]; | |
631 | ||
632 | while (frag_len) | |
633 | { | |
634 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
635 | devnull, | |
636 | frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0); | |
637 | if (i<=0) goto err; | |
638 | frag_len -= i; | |
639 | } | |
640 | return DTLS1_HM_FRAGMENT_RETRY; | |
641 | } | |
642 | ||
643 | /* read the body of the fragment (header has already been read */ | |
644 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
645 | frag->fragment + msg_hdr->frag_off,frag_len,0); | |
646 | if (i<=0 || (unsigned long)i!=frag_len) | |
647 | goto err; | |
648 | ||
6006ae14 DSH |
649 | RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off, |
650 | (long)(msg_hdr->frag_off + frag_len)); | |
934e22e8 | 651 | |
6006ae14 DSH |
652 | RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len, |
653 | is_complete); | |
934e22e8 DSH |
654 | |
655 | if (is_complete) | |
656 | { | |
657 | OPENSSL_free(frag->reassembly); | |
658 | frag->reassembly = NULL; | |
659 | } | |
660 | ||
661 | if (item == NULL) | |
662 | { | |
663 | memset(seq64be,0,sizeof(seq64be)); | |
664 | seq64be[6] = (unsigned char)(msg_hdr->seq>>8); | |
665 | seq64be[7] = (unsigned char)(msg_hdr->seq); | |
666 | ||
667 | item = pitem_new(seq64be, frag); | |
668 | if (item == NULL) | |
669 | { | |
670 | goto err; | |
671 | i = -1; | |
672 | } | |
673 | ||
674 | pqueue_insert(s->d1->buffered_messages, item); | |
675 | } | |
676 | ||
677 | return DTLS1_HM_FRAGMENT_RETRY; | |
678 | ||
679 | err: | |
680 | if (frag != NULL) dtls1_hm_fragment_free(frag); | |
681 | if (item != NULL) OPENSSL_free(item); | |
682 | *ok = 0; | |
683 | return i; | |
684 | } | |
685 | ||
686 | ||
36d16f8e | 687 | static int |
90acf770 | 688 | dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok) |
36d16f8e | 689 | { |
90acf770 | 690 | int i=-1; |
54ef01b5 AP |
691 | hm_fragment *frag = NULL; |
692 | pitem *item = NULL; | |
693 | unsigned char seq64be[8]; | |
90acf770 | 694 | unsigned long frag_len = msg_hdr->frag_len; |
36d16f8e | 695 | |
90acf770 | 696 | if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len) |
54ef01b5 | 697 | goto err; |
36d16f8e | 698 | |
481547f0 DSH |
699 | /* Try to find item in queue, to prevent duplicate entries */ |
700 | memset(seq64be,0,sizeof(seq64be)); | |
701 | seq64be[6] = (unsigned char) (msg_hdr->seq>>8); | |
702 | seq64be[7] = (unsigned char) msg_hdr->seq; | |
703 | item = pqueue_find(s->d1->buffered_messages, seq64be); | |
934e22e8 DSH |
704 | |
705 | /* If we already have an entry and this one is a fragment, | |
706 | * don't discard it and rather try to reassemble it. | |
707 | */ | |
708 | if (item != NULL && frag_len < msg_hdr->msg_len) | |
709 | item = NULL; | |
710 | ||
481547f0 | 711 | /* Discard the message if sequence number was already there, is |
58f41a92 DSH |
712 | * too far in the future, already in the queue or if we received |
713 | * a FINISHED before the SERVER_HELLO, which then must be a stale | |
714 | * retransmit. | |
715 | */ | |
481547f0 | 716 | if (msg_hdr->seq <= s->d1->handshake_read_seq || |
58f41a92 DSH |
717 | msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL || |
718 | (s->d1->handshake_read_seq == 0 && msg_hdr->type == SSL3_MT_FINISHED)) | |
90acf770 AP |
719 | { |
720 | unsigned char devnull [256]; | |
721 | ||
722 | while (frag_len) | |
723 | { | |
724 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
725 | devnull, | |
726 | frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0); | |
727 | if (i<=0) goto err; | |
728 | frag_len -= i; | |
729 | } | |
730 | } | |
934e22e8 | 731 | else |
90acf770 | 732 | { |
934e22e8 DSH |
733 | if (frag_len && frag_len < msg_hdr->msg_len) |
734 | return dtls1_reassemble_fragment(s, msg_hdr, ok); | |
735 | ||
736 | frag = dtls1_hm_fragment_new(frag_len, 0); | |
e5fa864f DSH |
737 | if ( frag == NULL) |
738 | goto err; | |
739 | ||
740 | memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); | |
741 | ||
934e22e8 DSH |
742 | if (frag_len) |
743 | { | |
744 | /* read the body of the fragment (header has already been read */ | |
745 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
746 | frag->fragment,frag_len,0); | |
747 | if (i<=0 || (unsigned long)i!=frag_len) | |
748 | goto err; | |
749 | } | |
90acf770 | 750 | |
e5fa864f DSH |
751 | memset(seq64be,0,sizeof(seq64be)); |
752 | seq64be[6] = (unsigned char)(msg_hdr->seq>>8); | |
753 | seq64be[7] = (unsigned char)(msg_hdr->seq); | |
188b0579 | 754 | |
e5fa864f DSH |
755 | item = pitem_new(seq64be, frag); |
756 | if ( item == NULL) | |
757 | goto err; | |
758 | ||
759 | pqueue_insert(s->d1->buffered_messages, item); | |
760 | } | |
36d16f8e | 761 | |
90acf770 | 762 | return DTLS1_HM_FRAGMENT_RETRY; |
36d16f8e BL |
763 | |
764 | err: | |
54ef01b5 AP |
765 | if ( frag != NULL) dtls1_hm_fragment_free(frag); |
766 | if ( item != NULL) OPENSSL_free(item); | |
54ef01b5 | 767 | *ok = 0; |
90acf770 | 768 | return i; |
54ef01b5 | 769 | } |
36d16f8e BL |
770 | |
771 | ||
beb056b3 | 772 | static long |
36d16f8e BL |
773 | dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok) |
774 | { | |
90acf770 | 775 | unsigned char wire[DTLS1_HM_HEADER_LENGTH]; |
934e22e8 | 776 | unsigned long len, frag_off, frag_len; |
36d16f8e BL |
777 | int i,al; |
778 | struct hm_header_st msg_hdr; | |
54ef01b5 AP |
779 | |
780 | /* see if we have the required fragment already */ | |
90acf770 AP |
781 | if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok) |
782 | { | |
934e22e8 | 783 | if (*ok) s->init_num = frag_len; |
90acf770 AP |
784 | return frag_len; |
785 | } | |
36d16f8e | 786 | |
54ef01b5 | 787 | /* read handshake message header */ |
90acf770 | 788 | i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,wire, |
36d16f8e BL |
789 | DTLS1_HM_HEADER_LENGTH, 0); |
790 | if (i <= 0) /* nbio, or an error */ | |
791 | { | |
792 | s->rwstate=SSL_READING; | |
793 | *ok = 0; | |
794 | return i; | |
795 | } | |
930e8012 DSH |
796 | /* Handshake fails if message header is incomplete */ |
797 | if (i != DTLS1_HM_HEADER_LENGTH) | |
798 | { | |
799 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
800 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE); | |
801 | goto f_err; | |
802 | } | |
36d16f8e | 803 | |
54ef01b5 | 804 | /* parse the message fragment header */ |
90acf770 | 805 | dtls1_get_message_header(wire, &msg_hdr); |
54ef01b5 AP |
806 | |
807 | /* | |
808 | * if this is a future (or stale) message it gets buffered | |
f74a0c0c DSH |
809 | * (or dropped)--no further processing at this time |
810 | * While listening, we accept seq 1 (ClientHello with cookie) | |
811 | * although we're still expecting seq 0 (ClientHello) | |
54ef01b5 | 812 | */ |
f74a0c0c | 813 | if (msg_hdr.seq != s->d1->handshake_read_seq && !(s->d1->listen && msg_hdr.seq == 1)) |
54ef01b5 AP |
814 | return dtls1_process_out_of_seq_message(s, &msg_hdr, ok); |
815 | ||
934e22e8 | 816 | len = msg_hdr.msg_len; |
54ef01b5 | 817 | frag_off = msg_hdr.frag_off; |
36d16f8e BL |
818 | frag_len = msg_hdr.frag_len; |
819 | ||
934e22e8 DSH |
820 | if (frag_len && frag_len < len) |
821 | return dtls1_reassemble_fragment(s, &msg_hdr, ok); | |
822 | ||
36d16f8e | 823 | if (!s->server && s->d1->r_msg_hdr.frag_off == 0 && |
90acf770 | 824 | wire[0] == SSL3_MT_HELLO_REQUEST) |
54ef01b5 AP |
825 | { |
826 | /* The server may always send 'Hello Request' messages -- | |
827 | * we are doing a handshake anyway now, so ignore them | |
828 | * if their format is correct. Does not count for | |
829 | * 'Finished' MAC. */ | |
90acf770 | 830 | if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) |
54ef01b5 AP |
831 | { |
832 | if (s->msg_callback) | |
833 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
90acf770 | 834 | wire, DTLS1_HM_HEADER_LENGTH, s, |
54ef01b5 AP |
835 | s->msg_callback_arg); |
836 | ||
837 | s->init_num = 0; | |
838 | return dtls1_get_message_fragment(s, st1, stn, | |
839 | max, ok); | |
840 | } | |
841 | else /* Incorrectly formated Hello request */ | |
842 | { | |
843 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
844 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE); | |
845 | goto f_err; | |
846 | } | |
847 | } | |
848 | ||
90acf770 | 849 | if ((al=dtls1_preprocess_fragment(s,&msg_hdr,max))) |
54ef01b5 | 850 | goto f_err; |
36d16f8e BL |
851 | |
852 | /* XDTLS: ressurect this when restart is in place */ | |
853 | s->state=stn; | |
54ef01b5 | 854 | |
36d16f8e BL |
855 | if ( frag_len > 0) |
856 | { | |
e979c039 | 857 | unsigned char *p=(unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH; |
90acf770 | 858 | |
36d16f8e | 859 | i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, |
90acf770 | 860 | &p[frag_off],frag_len,0); |
54ef01b5 | 861 | /* XDTLS: fix this--message fragments cannot span multiple packets */ |
36d16f8e BL |
862 | if (i <= 0) |
863 | { | |
864 | s->rwstate=SSL_READING; | |
865 | *ok = 0; | |
866 | return i; | |
867 | } | |
868 | } | |
869 | else | |
870 | i = 0; | |
871 | ||
54ef01b5 AP |
872 | /* XDTLS: an incorrectly formatted fragment should cause the |
873 | * handshake to fail */ | |
930e8012 DSH |
874 | if (i != (int)frag_len) |
875 | { | |
876 | al=SSL3_AD_ILLEGAL_PARAMETER; | |
877 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL3_AD_ILLEGAL_PARAMETER); | |
878 | goto f_err; | |
879 | } | |
36d16f8e | 880 | |
90acf770 | 881 | *ok = 1; |
36d16f8e | 882 | |
90acf770 AP |
883 | /* Note that s->init_num is *not* used as current offset in |
884 | * s->init_buf->data, but as a counter summing up fragments' | |
885 | * lengths: as soon as they sum up to handshake packet | |
886 | * length, we assume we have got all the fragments. */ | |
934e22e8 | 887 | s->init_num = frag_len; |
90acf770 | 888 | return frag_len; |
36d16f8e BL |
889 | |
890 | f_err: | |
891 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
54ef01b5 | 892 | s->init_num = 0; |
90acf770 | 893 | |
36d16f8e BL |
894 | *ok=0; |
895 | return(-1); | |
896 | } | |
897 | ||
898 | int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen) | |
899 | { | |
900 | unsigned char *p,*d; | |
901 | int i; | |
902 | unsigned long l; | |
903 | ||
904 | if (s->state == a) | |
905 | { | |
906 | d=(unsigned char *)s->init_buf->data; | |
907 | p= &(d[DTLS1_HM_HEADER_LENGTH]); | |
908 | ||
909 | i=s->method->ssl3_enc->final_finish_mac(s, | |
36d16f8e BL |
910 | sender,slen,s->s3->tmp.finish_md); |
911 | s->s3->tmp.finish_md_len = i; | |
912 | memcpy(p, s->s3->tmp.finish_md, i); | |
913 | p+=i; | |
914 | l=i; | |
915 | ||
49968440 DSH |
916 | /* Copy the finished so we can use it for |
917 | * renegotiation checks | |
918 | */ | |
919 | if(s->type == SSL_ST_CONNECT) | |
920 | { | |
921 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); | |
922 | memcpy(s->s3->previous_client_finished, | |
923 | s->s3->tmp.finish_md, i); | |
924 | s->s3->previous_client_finished_len=i; | |
925 | } | |
926 | else | |
927 | { | |
928 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); | |
929 | memcpy(s->s3->previous_server_finished, | |
930 | s->s3->tmp.finish_md, i); | |
931 | s->s3->previous_server_finished_len=i; | |
932 | } | |
933 | ||
36d16f8e BL |
934 | #ifdef OPENSSL_SYS_WIN16 |
935 | /* MSVC 1.5 does not clear the top bytes of the word unless | |
936 | * I do this. | |
937 | */ | |
938 | l&=0xffff; | |
939 | #endif | |
940 | ||
941 | d = dtls1_set_message_header(s, d, SSL3_MT_FINISHED, l, 0, l); | |
942 | s->init_num=(int)l+DTLS1_HM_HEADER_LENGTH; | |
943 | s->init_off=0; | |
944 | ||
945 | /* buffer the message to handle re-xmits */ | |
946 | dtls1_buffer_message(s, 0); | |
54ef01b5 | 947 | |
36d16f8e BL |
948 | s->state=b; |
949 | } | |
950 | ||
951 | /* SSL3_ST_SEND_xxxxxx_HELLO_B */ | |
952 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
953 | } | |
954 | ||
955 | /* for these 2 messages, we need to | |
956 | * ssl->enc_read_ctx re-init | |
957 | * ssl->s3->read_sequence zero | |
958 | * ssl->s3->read_mac_secret re-init | |
959 | * ssl->session->read_sym_enc assign | |
960 | * ssl->session->read_compression assign | |
961 | * ssl->session->read_hash assign | |
962 | */ | |
963 | int dtls1_send_change_cipher_spec(SSL *s, int a, int b) | |
964 | { | |
965 | unsigned char *p; | |
966 | ||
967 | if (s->state == a) | |
968 | { | |
969 | p=(unsigned char *)s->init_buf->data; | |
970 | *p++=SSL3_MT_CCS; | |
971 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
36d16f8e | 972 | s->init_num=DTLS1_CCS_HEADER_LENGTH; |
8711efb4 DSH |
973 | |
974 | if (s->version == DTLS1_BAD_VER) { | |
975 | s->d1->next_handshake_write_seq++; | |
976 | s2n(s->d1->handshake_write_seq,p); | |
977 | s->init_num+=2; | |
978 | } | |
979 | ||
36d16f8e BL |
980 | s->init_off=0; |
981 | ||
982 | dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, | |
983 | s->d1->handshake_write_seq, 0, 0); | |
984 | ||
985 | /* buffer the message to handle re-xmits */ | |
986 | dtls1_buffer_message(s, 1); | |
987 | ||
988 | s->state=b; | |
989 | } | |
990 | ||
991 | /* SSL3_ST_CW_CHANGE_B */ | |
992 | return(dtls1_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC)); | |
993 | } | |
994 | ||
d2f6d282 DSH |
995 | static int dtls1_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x) |
996 | { | |
4b06d778 DSH |
997 | int n; |
998 | unsigned char *p; | |
d2f6d282 | 999 | |
4b06d778 DSH |
1000 | n=i2d_X509(x,NULL); |
1001 | if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3))) | |
1002 | { | |
1003 | SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF,ERR_R_BUF_LIB); | |
1004 | return 0; | |
1005 | } | |
1006 | p=(unsigned char *)&(buf->data[*l]); | |
1007 | l2n3(n,p); | |
1008 | i2d_X509(x,&p); | |
1009 | *l+=n+3; | |
d2f6d282 | 1010 | |
4b06d778 | 1011 | return 1; |
d2f6d282 | 1012 | } |
36d16f8e BL |
1013 | unsigned long dtls1_output_cert_chain(SSL *s, X509 *x) |
1014 | { | |
1015 | unsigned char *p; | |
d2f6d282 | 1016 | int i; |
36d16f8e BL |
1017 | unsigned long l= 3 + DTLS1_HM_HEADER_LENGTH; |
1018 | BUF_MEM *buf; | |
36d16f8e BL |
1019 | |
1020 | /* TLSv1 sends a chain with nothing in it, instead of an alert */ | |
1021 | buf=s->init_buf; | |
1022 | if (!BUF_MEM_grow_clean(buf,10)) | |
1023 | { | |
beb056b3 | 1024 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB); |
36d16f8e BL |
1025 | return(0); |
1026 | } | |
1027 | if (x != NULL) | |
1028 | { | |
d2f6d282 DSH |
1029 | X509_STORE_CTX xs_ctx; |
1030 | ||
1031 | if (!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,x,NULL)) | |
1032 | { | |
1033 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB); | |
1034 | return(0); | |
1035 | } | |
1036 | ||
1037 | X509_verify_cert(&xs_ctx); | |
a3a06e65 DSH |
1038 | /* Don't leave errors in the queue */ |
1039 | ERR_clear_error(); | |
d2f6d282 DSH |
1040 | for (i=0; i < sk_X509_num(xs_ctx.chain); i++) |
1041 | { | |
1042 | x = sk_X509_value(xs_ctx.chain, i); | |
1043 | ||
1044 | if (!dtls1_add_cert_to_buf(buf, &l, x)) | |
1045 | { | |
1046 | X509_STORE_CTX_cleanup(&xs_ctx); | |
1047 | return 0; | |
1048 | } | |
1049 | } | |
1050 | X509_STORE_CTX_cleanup(&xs_ctx); | |
1051 | } | |
1052 | /* Thawte special :-) */ | |
36d16f8e BL |
1053 | for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++) |
1054 | { | |
1055 | x=sk_X509_value(s->ctx->extra_certs,i); | |
d2f6d282 DSH |
1056 | if (!dtls1_add_cert_to_buf(buf, &l, x)) |
1057 | return 0; | |
36d16f8e BL |
1058 | } |
1059 | ||
1060 | l-= (3 + DTLS1_HM_HEADER_LENGTH); | |
1061 | ||
1062 | p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); | |
1063 | l2n3(l,p); | |
1064 | l+=3; | |
1065 | p=(unsigned char *)&(buf->data[0]); | |
1066 | p = dtls1_set_message_header(s, p, SSL3_MT_CERTIFICATE, l, 0, l); | |
1067 | ||
1068 | l+=DTLS1_HM_HEADER_LENGTH; | |
1069 | return(l); | |
1070 | } | |
1071 | ||
1072 | int dtls1_read_failed(SSL *s, int code) | |
54ef01b5 | 1073 | { |
54ef01b5 AP |
1074 | if ( code > 0) |
1075 | { | |
1076 | fprintf( stderr, "invalid state reached %s:%d", __FILE__, __LINE__); | |
1077 | return 1; | |
1078 | } | |
1079 | ||
eb38b26d | 1080 | if (!dtls1_is_timer_expired(s)) |
54ef01b5 AP |
1081 | { |
1082 | /* not a timeout, none of our business, | |
1083 | let higher layers handle this. in fact it's probably an error */ | |
1084 | return code; | |
1085 | } | |
1086 | ||
4817504d DSH |
1087 | #ifndef OPENSSL_NO_HEARTBEATS |
1088 | if (!SSL_in_init(s) && !s->tlsext_hb_pending) /* done, no need to send a retransmit */ | |
1089 | #else | |
1090 | if (!SSL_in_init(s)) /* done, no need to send a retransmit */ | |
1091 | #endif | |
54ef01b5 AP |
1092 | { |
1093 | BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ); | |
1094 | return code; | |
1095 | } | |
1096 | ||
36d16f8e | 1097 | #if 0 /* for now, each alert contains only one record number */ |
54ef01b5 AP |
1098 | item = pqueue_peek(state->rcvd_records); |
1099 | if ( item ) | |
1100 | { | |
1101 | /* send an alert immediately for all the missing records */ | |
1102 | } | |
1103 | else | |
36d16f8e BL |
1104 | #endif |
1105 | ||
1106 | #if 0 /* no more alert sending, just retransmit the last set of messages */ | |
b972fbaa DSH |
1107 | if ( state->timeout.read_timeouts >= DTLS1_TMO_READ_COUNT) |
1108 | ssl3_send_alert(s,SSL3_AL_WARNING, | |
1109 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); | |
36d16f8e BL |
1110 | #endif |
1111 | ||
b972fbaa | 1112 | return dtls1_handle_timeout(s); |
54ef01b5 | 1113 | } |
36d16f8e | 1114 | |
e5fa864f DSH |
1115 | int |
1116 | dtls1_get_queue_priority(unsigned short seq, int is_ccs) | |
1117 | { | |
1118 | /* The index of the retransmission queue actually is the message sequence number, | |
1119 | * since the queue only contains messages of a single handshake. However, the | |
1120 | * ChangeCipherSpec has no message sequence number and so using only the sequence | |
1121 | * will result in the CCS and Finished having the same index. To prevent this, | |
1122 | * the sequence number is multiplied by 2. In case of a CCS 1 is subtracted. | |
1123 | * This does not only differ CSS and Finished, it also maintains the order of the | |
1124 | * index (important for priority queues) and fits in the unsigned short variable. | |
1125 | */ | |
1126 | return seq * 2 - is_ccs; | |
1127 | } | |
36d16f8e | 1128 | |
e5fa864f | 1129 | int |
36d16f8e | 1130 | dtls1_retransmit_buffered_messages(SSL *s) |
54ef01b5 AP |
1131 | { |
1132 | pqueue sent = s->d1->sent_messages; | |
1133 | piterator iter; | |
1134 | pitem *item; | |
1135 | hm_fragment *frag; | |
1136 | int found = 0; | |
1137 | ||
1138 | iter = pqueue_iterator(sent); | |
1139 | ||
1140 | for ( item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter)) | |
1141 | { | |
1142 | frag = (hm_fragment *)item->data; | |
e5fa864f | 1143 | if ( dtls1_retransmit_message(s, |
ef236ec3 | 1144 | (unsigned short)dtls1_get_queue_priority(frag->msg_header.seq, frag->msg_header.is_ccs), |
e5fa864f | 1145 | 0, &found) <= 0 && found) |
54ef01b5 AP |
1146 | { |
1147 | fprintf(stderr, "dtls1_retransmit_message() failed\n"); | |
1148 | return -1; | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | return 1; | |
1153 | } | |
36d16f8e | 1154 | |
36d16f8e BL |
1155 | int |
1156 | dtls1_buffer_message(SSL *s, int is_ccs) | |
54ef01b5 AP |
1157 | { |
1158 | pitem *item; | |
1159 | hm_fragment *frag; | |
1160 | unsigned char seq64be[8]; | |
1161 | ||
1162 | /* this function is called immediately after a message has | |
1163 | * been serialized */ | |
1164 | OPENSSL_assert(s->init_off == 0); | |
1165 | ||
934e22e8 | 1166 | frag = dtls1_hm_fragment_new(s->init_num, 0); |
54ef01b5 AP |
1167 | |
1168 | memcpy(frag->fragment, s->init_buf->data, s->init_num); | |
1169 | ||
1170 | if ( is_ccs) | |
1171 | { | |
1172 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + | |
8711efb4 | 1173 | ((s->version==DTLS1_VERSION)?DTLS1_CCS_HEADER_LENGTH:3) == (unsigned int)s->init_num); |
54ef01b5 AP |
1174 | } |
1175 | else | |
1176 | { | |
1177 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + | |
1178 | DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num); | |
1179 | } | |
1180 | ||
1181 | frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len; | |
1182 | frag->msg_header.seq = s->d1->w_msg_hdr.seq; | |
1183 | frag->msg_header.type = s->d1->w_msg_hdr.type; | |
1184 | frag->msg_header.frag_off = 0; | |
1185 | frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len; | |
1186 | frag->msg_header.is_ccs = is_ccs; | |
1187 | ||
e5fa864f DSH |
1188 | /* save current state*/ |
1189 | frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx; | |
1190 | frag->msg_header.saved_retransmit_state.write_hash = s->write_hash; | |
1191 | frag->msg_header.saved_retransmit_state.compress = s->compress; | |
1192 | frag->msg_header.saved_retransmit_state.session = s->session; | |
1193 | frag->msg_header.saved_retransmit_state.epoch = s->d1->w_epoch; | |
1194 | ||
54ef01b5 | 1195 | memset(seq64be,0,sizeof(seq64be)); |
e5fa864f DSH |
1196 | seq64be[6] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq, |
1197 | frag->msg_header.is_ccs)>>8); | |
1198 | seq64be[7] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq, | |
1199 | frag->msg_header.is_ccs)); | |
54ef01b5 AP |
1200 | |
1201 | item = pitem_new(seq64be, frag); | |
1202 | if ( item == NULL) | |
1203 | { | |
1204 | dtls1_hm_fragment_free(frag); | |
1205 | return 0; | |
1206 | } | |
36d16f8e BL |
1207 | |
1208 | #if 0 | |
54ef01b5 AP |
1209 | fprintf( stderr, "buffered messge: \ttype = %xx\n", msg_buf->type); |
1210 | fprintf( stderr, "\t\t\t\t\tlen = %d\n", msg_buf->len); | |
1211 | fprintf( stderr, "\t\t\t\t\tseq_num = %d\n", msg_buf->seq_num); | |
36d16f8e BL |
1212 | #endif |
1213 | ||
54ef01b5 AP |
1214 | pqueue_insert(s->d1->sent_messages, item); |
1215 | return 1; | |
1216 | } | |
36d16f8e BL |
1217 | |
1218 | int | |
1219 | dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off, | |
54ef01b5 AP |
1220 | int *found) |
1221 | { | |
1222 | int ret; | |
1223 | /* XDTLS: for now assuming that read/writes are blocking */ | |
1224 | pitem *item; | |
1225 | hm_fragment *frag ; | |
1226 | unsigned long header_length; | |
1227 | unsigned char seq64be[8]; | |
e5fa864f DSH |
1228 | struct dtls1_retransmit_state saved_state; |
1229 | unsigned char save_write_sequence[8]; | |
54ef01b5 AP |
1230 | |
1231 | /* | |
1232 | OPENSSL_assert(s->init_num == 0); | |
1233 | OPENSSL_assert(s->init_off == 0); | |
1234 | */ | |
1235 | ||
1236 | /* XDTLS: the requested message ought to be found, otherwise error */ | |
1237 | memset(seq64be,0,sizeof(seq64be)); | |
1238 | seq64be[6] = (unsigned char)(seq>>8); | |
1239 | seq64be[7] = (unsigned char)seq; | |
1240 | ||
1241 | item = pqueue_find(s->d1->sent_messages, seq64be); | |
1242 | if ( item == NULL) | |
1243 | { | |
1244 | fprintf(stderr, "retransmit: message %d non-existant\n", seq); | |
1245 | *found = 0; | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | *found = 1; | |
1250 | frag = (hm_fragment *)item->data; | |
1251 | ||
1252 | if ( frag->msg_header.is_ccs) | |
1253 | header_length = DTLS1_CCS_HEADER_LENGTH; | |
1254 | else | |
1255 | header_length = DTLS1_HM_HEADER_LENGTH; | |
1256 | ||
1257 | memcpy(s->init_buf->data, frag->fragment, | |
1258 | frag->msg_header.msg_len + header_length); | |
1259 | s->init_num = frag->msg_header.msg_len + header_length; | |
1260 | ||
1261 | dtls1_set_message_header_int(s, frag->msg_header.type, | |
1262 | frag->msg_header.msg_len, frag->msg_header.seq, 0, | |
1263 | frag->msg_header.frag_len); | |
1264 | ||
e5fa864f DSH |
1265 | /* save current state */ |
1266 | saved_state.enc_write_ctx = s->enc_write_ctx; | |
1267 | saved_state.write_hash = s->write_hash; | |
1268 | saved_state.compress = s->compress; | |
1269 | saved_state.session = s->session; | |
1270 | saved_state.epoch = s->d1->w_epoch; | |
1271 | saved_state.epoch = s->d1->w_epoch; | |
1272 | ||
54ef01b5 | 1273 | s->d1->retransmitting = 1; |
e5fa864f DSH |
1274 | |
1275 | /* restore state in which the message was originally sent */ | |
1276 | s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx; | |
1277 | s->write_hash = frag->msg_header.saved_retransmit_state.write_hash; | |
1278 | s->compress = frag->msg_header.saved_retransmit_state.compress; | |
1279 | s->session = frag->msg_header.saved_retransmit_state.session; | |
1280 | s->d1->w_epoch = frag->msg_header.saved_retransmit_state.epoch; | |
1281 | ||
1282 | if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1) | |
1283 | { | |
1284 | memcpy(save_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence)); | |
1285 | memcpy(s->s3->write_sequence, s->d1->last_write_sequence, sizeof(s->s3->write_sequence)); | |
1286 | } | |
1287 | ||
54ef01b5 | 1288 | ret = dtls1_do_write(s, frag->msg_header.is_ccs ? |
e5fa864f DSH |
1289 | SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE); |
1290 | ||
1291 | /* restore current state */ | |
1292 | s->enc_write_ctx = saved_state.enc_write_ctx; | |
1293 | s->write_hash = saved_state.write_hash; | |
1294 | s->compress = saved_state.compress; | |
1295 | s->session = saved_state.session; | |
1296 | s->d1->w_epoch = saved_state.epoch; | |
1297 | ||
1298 | if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1) | |
1299 | { | |
1300 | memcpy(s->d1->last_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence)); | |
1301 | memcpy(s->s3->write_sequence, save_write_sequence, sizeof(s->s3->write_sequence)); | |
1302 | } | |
1303 | ||
54ef01b5 AP |
1304 | s->d1->retransmitting = 0; |
1305 | ||
1306 | (void)BIO_flush(SSL_get_wbio(s)); | |
1307 | return ret; | |
1308 | } | |
36d16f8e BL |
1309 | |
1310 | /* call this function when the buffered messages are no longer needed */ | |
1311 | void | |
1312 | dtls1_clear_record_buffer(SSL *s) | |
54ef01b5 AP |
1313 | { |
1314 | pitem *item; | |
1315 | ||
1316 | for(item = pqueue_pop(s->d1->sent_messages); | |
1317 | item != NULL; item = pqueue_pop(s->d1->sent_messages)) | |
1318 | { | |
1319 | dtls1_hm_fragment_free((hm_fragment *)item->data); | |
1320 | pitem_free(item); | |
1321 | } | |
1322 | } | |
36d16f8e BL |
1323 | |
1324 | ||
1325 | unsigned char * | |
1326 | dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt, | |
54ef01b5 AP |
1327 | unsigned long len, unsigned long frag_off, unsigned long frag_len) |
1328 | { | |
f74a0c0c DSH |
1329 | /* Don't change sequence numbers while listening */ |
1330 | if (frag_off == 0 && !s->d1->listen) | |
54ef01b5 AP |
1331 | { |
1332 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
1333 | s->d1->next_handshake_write_seq++; | |
1334 | } | |
1335 | ||
1336 | dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq, | |
1337 | frag_off, frag_len); | |
1338 | ||
1339 | return p += DTLS1_HM_HEADER_LENGTH; | |
1340 | } | |
36d16f8e BL |
1341 | |
1342 | ||
1343 | /* don't actually do the writing, wait till the MTU has been retrieved */ | |
1344 | static void | |
1345 | dtls1_set_message_header_int(SSL *s, unsigned char mt, | |
54ef01b5 AP |
1346 | unsigned long len, unsigned short seq_num, unsigned long frag_off, |
1347 | unsigned long frag_len) | |
1348 | { | |
1349 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1350 | ||
1351 | msg_hdr->type = mt; | |
1352 | msg_hdr->msg_len = len; | |
1353 | msg_hdr->seq = seq_num; | |
1354 | msg_hdr->frag_off = frag_off; | |
1355 | msg_hdr->frag_len = frag_len; | |
1356 | } | |
36d16f8e BL |
1357 | |
1358 | static void | |
1359 | dtls1_fix_message_header(SSL *s, unsigned long frag_off, | |
54ef01b5 AP |
1360 | unsigned long frag_len) |
1361 | { | |
1362 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1363 | ||
1364 | msg_hdr->frag_off = frag_off; | |
1365 | msg_hdr->frag_len = frag_len; | |
1366 | } | |
36d16f8e BL |
1367 | |
1368 | static unsigned char * | |
1369 | dtls1_write_message_header(SSL *s, unsigned char *p) | |
54ef01b5 AP |
1370 | { |
1371 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1372 | ||
1373 | *p++ = msg_hdr->type; | |
1374 | l2n3(msg_hdr->msg_len, p); | |
1375 | ||
1376 | s2n(msg_hdr->seq, p); | |
1377 | l2n3(msg_hdr->frag_off, p); | |
1378 | l2n3(msg_hdr->frag_len, p); | |
1379 | ||
1380 | return p; | |
1381 | } | |
36d16f8e | 1382 | |
1d7392f2 | 1383 | unsigned int |
36d16f8e | 1384 | dtls1_min_mtu(void) |
54ef01b5 AP |
1385 | { |
1386 | return (g_probable_mtu[(sizeof(g_probable_mtu) / | |
1387 | sizeof(g_probable_mtu[0])) - 1]); | |
1388 | } | |
36d16f8e BL |
1389 | |
1390 | static unsigned int | |
1391 | dtls1_guess_mtu(unsigned int curr_mtu) | |
1392 | { | |
f920c5b5 | 1393 | unsigned int i; |
36d16f8e BL |
1394 | |
1395 | if ( curr_mtu == 0 ) | |
1396 | return g_probable_mtu[0] ; | |
1397 | ||
1398 | for ( i = 0; i < sizeof(g_probable_mtu)/sizeof(g_probable_mtu[0]); i++) | |
1399 | if ( curr_mtu > g_probable_mtu[i]) | |
1400 | return g_probable_mtu[i]; | |
54ef01b5 | 1401 | |
36d16f8e BL |
1402 | return curr_mtu; |
1403 | } | |
1404 | ||
1405 | void | |
1406 | dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr) | |
54ef01b5 AP |
1407 | { |
1408 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
1409 | msg_hdr->type = *(data++); | |
1410 | n2l3(data, msg_hdr->msg_len); | |
1411 | ||
1412 | n2s(data, msg_hdr->seq); | |
1413 | n2l3(data, msg_hdr->frag_off); | |
1414 | n2l3(data, msg_hdr->frag_len); | |
1415 | } | |
36d16f8e BL |
1416 | |
1417 | void | |
1418 | dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr) | |
54ef01b5 AP |
1419 | { |
1420 | memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st)); | |
1421 | ||
1422 | ccs_hdr->type = *(data++); | |
54ef01b5 | 1423 | } |
7e159e01 DSH |
1424 | |
1425 | int dtls1_shutdown(SSL *s) | |
1426 | { | |
1427 | int ret; | |
1428 | #ifndef OPENSSL_NO_SCTP | |
1429 | if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && | |
1430 | !(s->shutdown & SSL_SENT_SHUTDOWN)) | |
1431 | { | |
1432 | ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); | |
1433 | if (ret < 0) return -1; | |
1434 | ||
1435 | if (ret == 0) | |
1436 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 1, NULL); | |
1437 | } | |
1438 | #endif | |
1439 | ret = ssl3_shutdown(s); | |
1440 | #ifndef OPENSSL_NO_SCTP | |
1441 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 0, NULL); | |
1442 | #endif | |
1443 | return ret; | |
1444 | } | |
4817504d DSH |
1445 | |
1446 | #ifndef OPENSSL_NO_HEARTBEATS | |
1447 | int | |
1448 | dtls1_process_heartbeat(SSL *s) | |
1449 | { | |
1450 | unsigned char *p = &s->s3->rrec.data[0], *pl; | |
1451 | unsigned short hbtype; | |
1452 | unsigned int payload; | |
1453 | unsigned int padding = 16; /* Use minimum padding */ | |
1454 | ||
1455 | /* Read type and payload length first */ | |
1456 | hbtype = *p++; | |
1457 | n2s(p, payload); | |
1458 | pl = p; | |
1459 | ||
1460 | if (s->msg_callback) | |
1461 | s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT, | |
1462 | &s->s3->rrec.data[0], s->s3->rrec.length, | |
1463 | s, s->msg_callback_arg); | |
1464 | ||
1465 | if (hbtype == TLS1_HB_REQUEST) | |
1466 | { | |
1467 | unsigned char *buffer, *bp; | |
1468 | int r; | |
1469 | ||
1470 | /* Allocate memory for the response, size is 1 byte | |
1471 | * message type, plus 2 bytes payload length, plus | |
1472 | * payload, plus padding | |
1473 | */ | |
1474 | buffer = OPENSSL_malloc(1 + 2 + payload + padding); | |
1475 | bp = buffer; | |
1476 | ||
1477 | /* Enter response type, length and copy payload */ | |
1478 | *bp++ = TLS1_HB_RESPONSE; | |
1479 | s2n(payload, bp); | |
1480 | memcpy(bp, pl, payload); | |
1481 | /* Random padding */ | |
1482 | RAND_pseudo_bytes(p, padding); | |
1483 | ||
1484 | r = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding); | |
1485 | ||
1486 | if (r >= 0 && s->msg_callback) | |
1487 | s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT, | |
1488 | buffer, 3 + payload + padding, | |
1489 | s, s->msg_callback_arg); | |
1490 | ||
1491 | OPENSSL_free(buffer); | |
1492 | ||
1493 | if (r < 0) | |
1494 | return r; | |
1495 | } | |
1496 | else if (hbtype == TLS1_HB_RESPONSE) | |
1497 | { | |
1498 | unsigned int seq; | |
1499 | ||
1500 | /* We only send sequence numbers (2 bytes unsigned int), | |
1501 | * and 16 random bytes, so we just try to read the | |
1502 | * sequence number */ | |
1503 | n2s(pl, seq); | |
1504 | ||
1505 | if (payload == 18 && seq == s->tlsext_hb_seq) | |
1506 | { | |
1507 | dtls1_stop_timer(s); | |
1508 | s->tlsext_hb_seq++; | |
1509 | s->tlsext_hb_pending = 0; | |
1510 | } | |
1511 | } | |
1512 | ||
1513 | return 0; | |
1514 | } | |
1515 | ||
1516 | int | |
1517 | dtls1_heartbeat(SSL *s) | |
1518 | { | |
1519 | unsigned char *buf, *p; | |
1520 | int ret; | |
1521 | unsigned int payload = 18; /* Sequence number + random bytes */ | |
1522 | unsigned int padding = 16; /* Use minimum padding */ | |
1523 | ||
1524 | /* Only send if peer supports and accepts HB requests... */ | |
1525 | if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) || | |
1526 | s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS) | |
1527 | { | |
1528 | SSLerr(SSL_F_DTLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT); | |
1529 | return -1; | |
1530 | } | |
1531 | ||
1532 | /* ...and there is none in flight yet... */ | |
1533 | if (s->tlsext_hb_pending) | |
1534 | { | |
1535 | SSLerr(SSL_F_DTLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING); | |
1536 | return -1; | |
1537 | } | |
1538 | ||
1539 | /* ...and no handshake in progress. */ | |
1540 | if (SSL_in_init(s) || s->in_handshake) | |
1541 | { | |
1542 | SSLerr(SSL_F_DTLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE); | |
1543 | return -1; | |
1544 | } | |
1545 | ||
1546 | /* Check if padding is too long, payload and padding | |
1547 | * must not exceed 2^14 - 3 = 16381 bytes in total. | |
1548 | */ | |
1549 | OPENSSL_assert(payload + padding <= 16381); | |
1550 | ||
1551 | /* Create HeartBeat message, we just use a sequence number | |
1552 | * as payload to distuingish different messages and add | |
1553 | * some random stuff. | |
1554 | * - Message Type, 1 byte | |
1555 | * - Payload Length, 2 bytes (unsigned int) | |
1556 | * - Payload, the sequence number (2 bytes uint) | |
1557 | * - Payload, random bytes (16 bytes uint) | |
1558 | * - Padding | |
1559 | */ | |
1560 | buf = OPENSSL_malloc(1 + 2 + payload + padding); | |
1561 | p = buf; | |
1562 | /* Message Type */ | |
1563 | *p++ = TLS1_HB_REQUEST; | |
1564 | /* Payload length (18 bytes here) */ | |
1565 | s2n(payload, p); | |
1566 | /* Sequence number */ | |
1567 | s2n(s->tlsext_hb_seq, p); | |
1568 | /* 16 random bytes */ | |
1569 | RAND_pseudo_bytes(p, 16); | |
1570 | p += 16; | |
1571 | /* Random padding */ | |
1572 | RAND_pseudo_bytes(p, padding); | |
1573 | ||
1574 | ret = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding); | |
1575 | if (ret >= 0) | |
1576 | { | |
1577 | if (s->msg_callback) | |
1578 | s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT, | |
1579 | buf, 3 + payload + padding, | |
1580 | s, s->msg_callback_arg); | |
1581 | ||
1582 | dtls1_start_timer(s); | |
1583 | s->tlsext_hb_pending = 1; | |
1584 | } | |
1585 | ||
1586 | OPENSSL_free(buf); | |
1587 | ||
1588 | return ret; | |
1589 | } | |
1590 | #endif |