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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 | ||
126 | ||
127 | /* XDTLS: figure out the right values */ | |
128 | static unsigned int g_probable_mtu[] = {1500 - 28, 512 - 28, 256 - 28}; | |
129 | ||
130 | static unsigned int dtls1_min_mtu(void); | |
131 | static unsigned int dtls1_guess_mtu(unsigned int curr_mtu); | |
132 | static void dtls1_fix_message_header(SSL *s, unsigned long frag_off, | |
133 | unsigned long frag_len); | |
134 | static unsigned char *dtls1_write_message_header(SSL *s, | |
135 | unsigned char *p); | |
136 | static void dtls1_set_message_header_int(SSL *s, unsigned char mt, | |
137 | unsigned long len, unsigned short seq_num, unsigned long frag_off, | |
138 | unsigned long frag_len); | |
36d16f8e | 139 | static long dtls1_get_message_fragment(SSL *s, int st1, int stn, |
54ef01b5 | 140 | long max, int *ok); |
36d16f8e BL |
141 | |
142 | static hm_fragment * | |
143 | dtls1_hm_fragment_new(unsigned long frag_len) | |
54ef01b5 AP |
144 | { |
145 | hm_fragment *frag = NULL; | |
146 | unsigned char *buf = NULL; | |
147 | ||
148 | frag = (hm_fragment *)OPENSSL_malloc(sizeof(hm_fragment)); | |
149 | if ( frag == NULL) | |
150 | return NULL; | |
151 | ||
90acf770 | 152 | if (frag_len) |
54ef01b5 | 153 | { |
90acf770 AP |
154 | buf = (unsigned char *)OPENSSL_malloc(frag_len); |
155 | if ( buf == NULL) | |
156 | { | |
157 | OPENSSL_free(frag); | |
158 | return NULL; | |
159 | } | |
54ef01b5 AP |
160 | } |
161 | ||
90acf770 | 162 | /* zero length fragment gets zero frag->fragment */ |
54ef01b5 AP |
163 | frag->fragment = buf; |
164 | ||
165 | return frag; | |
166 | } | |
36d16f8e BL |
167 | |
168 | static void | |
169 | dtls1_hm_fragment_free(hm_fragment *frag) | |
54ef01b5 | 170 | { |
90acf770 | 171 | if (frag->fragment) OPENSSL_free(frag->fragment); |
54ef01b5 AP |
172 | OPENSSL_free(frag); |
173 | } | |
36d16f8e BL |
174 | |
175 | /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */ | |
176 | int dtls1_do_write(SSL *s, int type) | |
177 | { | |
178 | int ret; | |
179 | int curr_mtu; | |
180 | unsigned int len, frag_off; | |
181 | ||
182 | /* AHA! Figure out the MTU, and stick to the right size */ | |
183 | if ( ! (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) | |
54ef01b5 | 184 | { |
36d16f8e BL |
185 | s->d1->mtu = |
186 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); | |
187 | ||
188 | /* I've seen the kernel return bogus numbers when it doesn't know | |
189 | * (initial write), so just make sure we have a reasonable number */ | |
190 | if ( s->d1->mtu < dtls1_min_mtu()) | |
191 | { | |
192 | s->d1->mtu = 0; | |
193 | s->d1->mtu = dtls1_guess_mtu(s->d1->mtu); | |
194 | BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU, | |
195 | s->d1->mtu, NULL); | |
196 | } | |
197 | } | |
198 | #if 0 | |
199 | mtu = s->d1->mtu; | |
200 | ||
201 | fprintf(stderr, "using MTU = %d\n", mtu); | |
202 | ||
203 | mtu -= (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH); | |
204 | ||
205 | curr_mtu = mtu - BIO_wpending(SSL_get_wbio(s)); | |
206 | ||
207 | if ( curr_mtu > 0) | |
208 | mtu = curr_mtu; | |
209 | else if ( ( ret = BIO_flush(SSL_get_wbio(s))) <= 0) | |
210 | return ret; | |
54ef01b5 | 211 | |
36d16f8e BL |
212 | if ( BIO_wpending(SSL_get_wbio(s)) + s->init_num >= mtu) |
213 | { | |
214 | ret = BIO_flush(SSL_get_wbio(s)); | |
215 | if ( ret <= 0) | |
216 | return ret; | |
217 | mtu = s->d1->mtu - (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH); | |
218 | } | |
219 | ||
220 | OPENSSL_assert(mtu > 0); /* should have something reasonable now */ | |
221 | ||
222 | #endif | |
223 | ||
224 | if ( s->init_off == 0 && type == SSL3_RT_HANDSHAKE) | |
225 | OPENSSL_assert(s->init_num == | |
6c61726b | 226 | (int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH); |
36d16f8e BL |
227 | |
228 | frag_off = 0; | |
229 | while( s->init_num) | |
230 | { | |
231 | curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) - | |
232 | DTLS1_RT_HEADER_LENGTH; | |
233 | ||
234 | if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH) | |
235 | { | |
236 | /* grr.. we could get an error if MTU picked was wrong */ | |
237 | ret = BIO_flush(SSL_get_wbio(s)); | |
238 | if ( ret <= 0) | |
239 | return ret; | |
240 | curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH; | |
241 | } | |
242 | ||
243 | if ( s->init_num > curr_mtu) | |
244 | len = curr_mtu; | |
245 | else | |
246 | len = s->init_num; | |
247 | ||
248 | ||
249 | /* XDTLS: this function is too long. split out the CCS part */ | |
250 | if ( type == SSL3_RT_HANDSHAKE) | |
251 | { | |
252 | if ( s->init_off != 0) | |
253 | { | |
254 | OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH); | |
255 | s->init_off -= DTLS1_HM_HEADER_LENGTH; | |
256 | s->init_num += DTLS1_HM_HEADER_LENGTH; | |
257 | ||
54ef01b5 | 258 | /* write atleast DTLS1_HM_HEADER_LENGTH bytes */ |
36d16f8e BL |
259 | if ( len <= DTLS1_HM_HEADER_LENGTH) |
260 | len += DTLS1_HM_HEADER_LENGTH; | |
261 | } | |
54ef01b5 | 262 | |
36d16f8e BL |
263 | dtls1_fix_message_header(s, frag_off, |
264 | len - DTLS1_HM_HEADER_LENGTH); | |
265 | ||
4e321ffa | 266 | dtls1_write_message_header(s, (unsigned char *)&s->init_buf->data[s->init_off]); |
36d16f8e BL |
267 | |
268 | OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH); | |
269 | } | |
270 | ||
271 | ret=dtls1_write_bytes(s,type,&s->init_buf->data[s->init_off], | |
272 | len); | |
273 | if (ret < 0) | |
274 | { | |
275 | /* might need to update MTU here, but we don't know | |
276 | * which previous packet caused the failure -- so can't | |
277 | * really retransmit anything. continue as if everything | |
278 | * is fine and wait for an alert to handle the | |
279 | * retransmit | |
280 | */ | |
281 | if ( BIO_ctrl(SSL_get_wbio(s), | |
282 | BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL)) | |
283 | s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), | |
284 | BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); | |
285 | else | |
286 | return(-1); | |
287 | } | |
288 | else | |
289 | { | |
54ef01b5 | 290 | |
36d16f8e BL |
291 | /* bad if this assert fails, only part of the handshake |
292 | * message got sent. but why would this happen? */ | |
90acf770 | 293 | OPENSSL_assert(len == (unsigned int)ret); |
54ef01b5 | 294 | |
36d16f8e | 295 | if (type == SSL3_RT_HANDSHAKE && ! s->d1->retransmitting) |
90acf770 | 296 | { |
36d16f8e BL |
297 | /* should not be done for 'Hello Request's, but in that case |
298 | * we'll ignore the result anyway */ | |
e979c039 | 299 | unsigned char *p = (unsigned char *)&s->init_buf->data[s->init_off]; |
90acf770 | 300 | const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; |
e979c039 | 301 | int xlen; |
90acf770 | 302 | |
8711efb4 | 303 | if (frag_off == 0 && s->version != DTLS1_BAD_VER) |
90acf770 AP |
304 | { |
305 | /* reconstruct message header is if it | |
306 | * is being sent in single fragment */ | |
307 | *p++ = msg_hdr->type; | |
308 | l2n3(msg_hdr->msg_len,p); | |
309 | s2n (msg_hdr->seq,p); | |
310 | l2n3(0,p); | |
311 | l2n3(msg_hdr->msg_len,p); | |
312 | p -= DTLS1_HM_HEADER_LENGTH; | |
e979c039 | 313 | xlen = ret; |
90acf770 AP |
314 | } |
315 | else | |
316 | { | |
317 | p += DTLS1_HM_HEADER_LENGTH; | |
e979c039 | 318 | xlen = ret - DTLS1_HM_HEADER_LENGTH; |
90acf770 AP |
319 | } |
320 | ||
e979c039 | 321 | ssl3_finish_mac(s, p, xlen); |
90acf770 AP |
322 | } |
323 | ||
36d16f8e BL |
324 | if (ret == s->init_num) |
325 | { | |
326 | if (s->msg_callback) | |
327 | s->msg_callback(1, s->version, type, s->init_buf->data, | |
328 | (size_t)(s->init_off + s->init_num), s, | |
329 | s->msg_callback_arg); | |
330 | ||
331 | s->init_off = 0; /* done writing this message */ | |
332 | s->init_num = 0; | |
90acf770 | 333 | |
36d16f8e BL |
334 | return(1); |
335 | } | |
336 | s->init_off+=ret; | |
337 | s->init_num-=ret; | |
338 | frag_off += (ret -= DTLS1_HM_HEADER_LENGTH); | |
339 | } | |
340 | } | |
341 | return(0); | |
342 | } | |
343 | ||
344 | ||
345 | /* Obtain handshake message of message type 'mt' (any if mt == -1), | |
346 | * maximum acceptable body length 'max'. | |
347 | * Read an entire handshake message. Handshake messages arrive in | |
348 | * fragments. | |
349 | */ | |
beb056b3 | 350 | long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok) |
36d16f8e BL |
351 | { |
352 | int i, al; | |
90acf770 | 353 | struct hm_header_st *msg_hdr; |
36d16f8e BL |
354 | |
355 | /* s3->tmp is used to store messages that are unexpected, caused | |
356 | * by the absence of an optional handshake message */ | |
357 | if (s->s3->tmp.reuse_message) | |
358 | { | |
359 | s->s3->tmp.reuse_message=0; | |
360 | if ((mt >= 0) && (s->s3->tmp.message_type != mt)) | |
361 | { | |
362 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
beb056b3 | 363 | SSLerr(SSL_F_DTLS1_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE); |
36d16f8e BL |
364 | goto f_err; |
365 | } | |
366 | *ok=1; | |
367 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
368 | s->init_num = (int)s->s3->tmp.message_size; | |
369 | return s->init_num; | |
370 | } | |
54ef01b5 | 371 | |
90acf770 | 372 | msg_hdr = &s->d1->r_msg_hdr; |
36d16f8e BL |
373 | do |
374 | { | |
90acf770 | 375 | if ( msg_hdr->frag_off == 0) |
36d16f8e BL |
376 | { |
377 | /* s->d1->r_message_header.msg_len = 0; */ | |
90acf770 | 378 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); |
36d16f8e BL |
379 | } |
380 | ||
381 | i = dtls1_get_message_fragment(s, st1, stn, max, ok); | |
382 | if ( i == DTLS1_HM_BAD_FRAGMENT || | |
54ef01b5 | 383 | i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */ |
36d16f8e BL |
384 | continue; |
385 | else if ( i <= 0 && !*ok) | |
386 | return i; | |
387 | ||
90acf770 AP |
388 | /* Note that s->init_sum is used as a counter summing |
389 | * up fragments' lengths: as soon as they sum up to | |
390 | * handshake packet length, we assume we have got all | |
391 | * the fragments. Overlapping fragments would cause | |
392 | * premature termination, so we don't expect overlaps. | |
393 | * Well, handling overlaps would require something more | |
394 | * drastic. Indeed, as it is now there is no way to | |
395 | * tell if out-of-order fragment from the middle was | |
396 | * the last. '>=' is the best/least we can do to control | |
397 | * the potential damage caused by malformed overlaps. */ | |
398 | if ((unsigned int)s->init_num >= msg_hdr->msg_len) | |
36d16f8e | 399 | { |
e979c039 | 400 | unsigned char *p = (unsigned char *)s->init_buf->data; |
90acf770 AP |
401 | unsigned long msg_len = msg_hdr->msg_len; |
402 | ||
403 | /* reconstruct message header as if it was | |
404 | * sent in single fragment */ | |
405 | *(p++) = msg_hdr->type; | |
406 | l2n3(msg_len,p); | |
407 | s2n (msg_hdr->seq,p); | |
408 | l2n3(0,p); | |
409 | l2n3(msg_len,p); | |
8711efb4 DSH |
410 | if (s->version != DTLS1_BAD_VER) { |
411 | p -= DTLS1_HM_HEADER_LENGTH; | |
412 | msg_len += DTLS1_HM_HEADER_LENGTH; | |
413 | } | |
90acf770 AP |
414 | |
415 | ssl3_finish_mac(s, p, msg_len); | |
416 | if (s->msg_callback) | |
417 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
418 | p, msg_len, | |
419 | s, s->msg_callback_arg); | |
420 | ||
421 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
36d16f8e BL |
422 | |
423 | s->d1->handshake_read_seq++; | |
424 | /* we just read a handshake message from the other side: | |
425 | * this means that we don't need to retransmit of the | |
426 | * buffered messages. | |
427 | * XDTLS: may be able clear out this | |
428 | * buffer a little sooner (i.e if an out-of-order | |
429 | * handshake message/record is received at the record | |
430 | * layer. | |
431 | * XDTLS: exception is that the server needs to | |
432 | * know that change cipher spec and finished messages | |
433 | * have been received by the client before clearing this | |
434 | * buffer. this can simply be done by waiting for the | |
435 | * first data segment, but is there a better way? */ | |
436 | dtls1_clear_record_buffer(s); | |
437 | ||
54ef01b5 | 438 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; |
90acf770 | 439 | return s->init_num; |
36d16f8e BL |
440 | } |
441 | else | |
90acf770 | 442 | msg_hdr->frag_off = i; |
36d16f8e BL |
443 | } while(1) ; |
444 | ||
445 | f_err: | |
446 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
447 | *ok = 0; | |
448 | return -1; | |
449 | } | |
450 | ||
451 | ||
90acf770 AP |
452 | static int dtls1_preprocess_fragment(SSL *s,struct hm_header_st *msg_hdr,int max) |
453 | { | |
454 | size_t frag_off,frag_len,msg_len; | |
455 | ||
456 | msg_len = msg_hdr->msg_len; | |
457 | frag_off = msg_hdr->frag_off; | |
458 | frag_len = msg_hdr->frag_len; | |
459 | ||
460 | /* sanity checking */ | |
461 | if ( (frag_off+frag_len) > msg_len) | |
462 | { | |
463 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
464 | return SSL_AD_ILLEGAL_PARAMETER; | |
465 | } | |
466 | ||
467 | if ( (frag_off+frag_len) > (unsigned long)max) | |
468 | { | |
469 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
470 | return SSL_AD_ILLEGAL_PARAMETER; | |
471 | } | |
472 | ||
473 | if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */ | |
474 | { | |
475 | /* msg_len is limited to 2^24, but is effectively checked | |
476 | * against max above */ | |
477 | if (!BUF_MEM_grow_clean(s->init_buf,msg_len+DTLS1_HM_HEADER_LENGTH)) | |
478 | { | |
479 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,ERR_R_BUF_LIB); | |
480 | return SSL_AD_INTERNAL_ERROR; | |
481 | } | |
482 | ||
483 | s->s3->tmp.message_size = msg_len; | |
484 | s->d1->r_msg_hdr.msg_len = msg_len; | |
485 | s->s3->tmp.message_type = msg_hdr->type; | |
486 | s->d1->r_msg_hdr.type = msg_hdr->type; | |
487 | s->d1->r_msg_hdr.seq = msg_hdr->seq; | |
488 | } | |
489 | else if (msg_len != s->d1->r_msg_hdr.msg_len) | |
490 | { | |
491 | /* They must be playing with us! BTW, failure to enforce | |
492 | * upper limit would open possibility for buffer overrun. */ | |
493 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
494 | return SSL_AD_ILLEGAL_PARAMETER; | |
495 | } | |
496 | ||
497 | return 0; /* no error */ | |
498 | } | |
499 | ||
500 | ||
36d16f8e | 501 | static int |
90acf770 | 502 | dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok) |
54ef01b5 AP |
503 | { |
504 | /* (0) check whether the desired fragment is available | |
505 | * if so: | |
506 | * (1) copy over the fragment to s->init_buf->data[] | |
507 | * (2) update s->init_num | |
508 | */ | |
509 | pitem *item; | |
510 | hm_fragment *frag; | |
90acf770 | 511 | int al; |
54ef01b5 | 512 | |
90acf770 | 513 | *ok = 0; |
54ef01b5 AP |
514 | item = pqueue_peek(s->d1->buffered_messages); |
515 | if ( item == NULL) | |
516 | return 0; | |
517 | ||
518 | frag = (hm_fragment *)item->data; | |
519 | ||
90acf770 | 520 | if ( s->d1->handshake_read_seq == frag->msg_header.seq) |
54ef01b5 | 521 | { |
715feb31 | 522 | unsigned long frag_len = frag->msg_header.frag_len; |
54ef01b5 | 523 | pqueue_pop(s->d1->buffered_messages); |
54ef01b5 | 524 | |
90acf770 AP |
525 | al=dtls1_preprocess_fragment(s,&frag->msg_header,max); |
526 | ||
527 | if (al==0) /* no alert */ | |
528 | { | |
e979c039 | 529 | unsigned char *p = (unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH; |
90acf770 AP |
530 | memcpy(&p[frag->msg_header.frag_off], |
531 | frag->fragment,frag->msg_header.frag_len); | |
532 | } | |
54ef01b5 | 533 | |
90acf770 | 534 | dtls1_hm_fragment_free(frag); |
54ef01b5 AP |
535 | pitem_free(item); |
536 | ||
90acf770 AP |
537 | if (al==0) |
538 | { | |
539 | *ok = 1; | |
715feb31 | 540 | return frag_len; |
90acf770 AP |
541 | } |
542 | ||
543 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
544 | s->init_num = 0; | |
545 | *ok = 0; | |
546 | return -1; | |
54ef01b5 AP |
547 | } |
548 | else | |
549 | return 0; | |
550 | } | |
36d16f8e BL |
551 | |
552 | ||
553 | static int | |
90acf770 | 554 | dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok) |
36d16f8e | 555 | { |
90acf770 | 556 | int i=-1; |
54ef01b5 AP |
557 | hm_fragment *frag = NULL; |
558 | pitem *item = NULL; | |
559 | unsigned char seq64be[8]; | |
90acf770 | 560 | unsigned long frag_len = msg_hdr->frag_len; |
36d16f8e | 561 | |
90acf770 | 562 | if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len) |
54ef01b5 | 563 | goto err; |
36d16f8e | 564 | |
90acf770 AP |
565 | if (msg_hdr->seq <= s->d1->handshake_read_seq) |
566 | { | |
567 | unsigned char devnull [256]; | |
568 | ||
569 | while (frag_len) | |
570 | { | |
571 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
572 | devnull, | |
573 | frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0); | |
574 | if (i<=0) goto err; | |
575 | frag_len -= i; | |
576 | } | |
577 | } | |
578 | ||
90acf770 AP |
579 | if (frag_len) |
580 | { | |
e5fa864f DSH |
581 | frag = dtls1_hm_fragment_new(frag_len); |
582 | if ( frag == NULL) | |
583 | goto err; | |
584 | ||
585 | memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); | |
586 | ||
90acf770 AP |
587 | /* read the body of the fragment (header has already been read */ |
588 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
589 | frag->fragment,frag_len,0); | |
590 | if (i<=0 || (unsigned long)i!=frag_len) | |
591 | goto err; | |
90acf770 | 592 | |
e5fa864f DSH |
593 | memset(seq64be,0,sizeof(seq64be)); |
594 | seq64be[6] = (unsigned char)(msg_hdr->seq>>8); | |
595 | seq64be[7] = (unsigned char)(msg_hdr->seq); | |
188b0579 | 596 | |
e5fa864f DSH |
597 | item = pitem_new(seq64be, frag); |
598 | if ( item == NULL) | |
599 | goto err; | |
600 | ||
601 | pqueue_insert(s->d1->buffered_messages, item); | |
602 | } | |
36d16f8e | 603 | |
90acf770 | 604 | return DTLS1_HM_FRAGMENT_RETRY; |
36d16f8e BL |
605 | |
606 | err: | |
54ef01b5 AP |
607 | if ( frag != NULL) dtls1_hm_fragment_free(frag); |
608 | if ( item != NULL) OPENSSL_free(item); | |
54ef01b5 | 609 | *ok = 0; |
90acf770 | 610 | return i; |
54ef01b5 | 611 | } |
36d16f8e BL |
612 | |
613 | ||
beb056b3 | 614 | static long |
36d16f8e BL |
615 | dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok) |
616 | { | |
90acf770 | 617 | unsigned char wire[DTLS1_HM_HEADER_LENGTH]; |
36d16f8e BL |
618 | unsigned long l, frag_off, frag_len; |
619 | int i,al; | |
620 | struct hm_header_st msg_hdr; | |
54ef01b5 AP |
621 | |
622 | /* see if we have the required fragment already */ | |
90acf770 AP |
623 | if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok) |
624 | { | |
625 | if (*ok) s->init_num += frag_len; | |
626 | return frag_len; | |
627 | } | |
36d16f8e | 628 | |
54ef01b5 | 629 | /* read handshake message header */ |
90acf770 | 630 | i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,wire, |
36d16f8e BL |
631 | DTLS1_HM_HEADER_LENGTH, 0); |
632 | if (i <= 0) /* nbio, or an error */ | |
633 | { | |
634 | s->rwstate=SSL_READING; | |
635 | *ok = 0; | |
636 | return i; | |
637 | } | |
36d16f8e BL |
638 | OPENSSL_assert(i == DTLS1_HM_HEADER_LENGTH); |
639 | ||
54ef01b5 | 640 | /* parse the message fragment header */ |
90acf770 | 641 | dtls1_get_message_header(wire, &msg_hdr); |
54ef01b5 AP |
642 | |
643 | /* | |
644 | * if this is a future (or stale) message it gets buffered | |
645 | * (or dropped)--no further processing at this time | |
646 | */ | |
647 | if ( msg_hdr.seq != s->d1->handshake_read_seq) | |
648 | return dtls1_process_out_of_seq_message(s, &msg_hdr, ok); | |
649 | ||
650 | l = msg_hdr.msg_len; | |
651 | frag_off = msg_hdr.frag_off; | |
36d16f8e BL |
652 | frag_len = msg_hdr.frag_len; |
653 | ||
36d16f8e | 654 | if (!s->server && s->d1->r_msg_hdr.frag_off == 0 && |
90acf770 | 655 | wire[0] == SSL3_MT_HELLO_REQUEST) |
54ef01b5 AP |
656 | { |
657 | /* The server may always send 'Hello Request' messages -- | |
658 | * we are doing a handshake anyway now, so ignore them | |
659 | * if their format is correct. Does not count for | |
660 | * 'Finished' MAC. */ | |
90acf770 | 661 | if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) |
54ef01b5 AP |
662 | { |
663 | if (s->msg_callback) | |
664 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
90acf770 | 665 | wire, DTLS1_HM_HEADER_LENGTH, s, |
54ef01b5 AP |
666 | s->msg_callback_arg); |
667 | ||
668 | s->init_num = 0; | |
669 | return dtls1_get_message_fragment(s, st1, stn, | |
670 | max, ok); | |
671 | } | |
672 | else /* Incorrectly formated Hello request */ | |
673 | { | |
674 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
675 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE); | |
676 | goto f_err; | |
677 | } | |
678 | } | |
679 | ||
90acf770 | 680 | if ((al=dtls1_preprocess_fragment(s,&msg_hdr,max))) |
54ef01b5 | 681 | goto f_err; |
36d16f8e BL |
682 | |
683 | /* XDTLS: ressurect this when restart is in place */ | |
684 | s->state=stn; | |
54ef01b5 | 685 | |
36d16f8e BL |
686 | if ( frag_len > 0) |
687 | { | |
e979c039 | 688 | unsigned char *p=(unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH; |
90acf770 | 689 | |
36d16f8e | 690 | i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, |
90acf770 | 691 | &p[frag_off],frag_len,0); |
54ef01b5 | 692 | /* XDTLS: fix this--message fragments cannot span multiple packets */ |
36d16f8e BL |
693 | if (i <= 0) |
694 | { | |
695 | s->rwstate=SSL_READING; | |
696 | *ok = 0; | |
697 | return i; | |
698 | } | |
699 | } | |
700 | else | |
701 | i = 0; | |
702 | ||
54ef01b5 AP |
703 | /* XDTLS: an incorrectly formatted fragment should cause the |
704 | * handshake to fail */ | |
6c61726b | 705 | OPENSSL_assert(i == (int)frag_len); |
36d16f8e | 706 | |
90acf770 | 707 | *ok = 1; |
36d16f8e | 708 | |
90acf770 AP |
709 | /* Note that s->init_num is *not* used as current offset in |
710 | * s->init_buf->data, but as a counter summing up fragments' | |
711 | * lengths: as soon as they sum up to handshake packet | |
712 | * length, we assume we have got all the fragments. */ | |
713 | s->init_num += frag_len; | |
714 | return frag_len; | |
36d16f8e BL |
715 | |
716 | f_err: | |
717 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
54ef01b5 | 718 | s->init_num = 0; |
90acf770 | 719 | |
36d16f8e BL |
720 | *ok=0; |
721 | return(-1); | |
722 | } | |
723 | ||
724 | int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen) | |
725 | { | |
726 | unsigned char *p,*d; | |
727 | int i; | |
728 | unsigned long l; | |
729 | ||
730 | if (s->state == a) | |
731 | { | |
732 | d=(unsigned char *)s->init_buf->data; | |
733 | p= &(d[DTLS1_HM_HEADER_LENGTH]); | |
734 | ||
735 | i=s->method->ssl3_enc->final_finish_mac(s, | |
36d16f8e BL |
736 | sender,slen,s->s3->tmp.finish_md); |
737 | s->s3->tmp.finish_md_len = i; | |
738 | memcpy(p, s->s3->tmp.finish_md, i); | |
739 | p+=i; | |
740 | l=i; | |
741 | ||
742 | #ifdef OPENSSL_SYS_WIN16 | |
743 | /* MSVC 1.5 does not clear the top bytes of the word unless | |
744 | * I do this. | |
745 | */ | |
746 | l&=0xffff; | |
747 | #endif | |
748 | ||
749 | d = dtls1_set_message_header(s, d, SSL3_MT_FINISHED, l, 0, l); | |
750 | s->init_num=(int)l+DTLS1_HM_HEADER_LENGTH; | |
751 | s->init_off=0; | |
752 | ||
753 | /* buffer the message to handle re-xmits */ | |
754 | dtls1_buffer_message(s, 0); | |
54ef01b5 | 755 | |
36d16f8e BL |
756 | s->state=b; |
757 | } | |
758 | ||
759 | /* SSL3_ST_SEND_xxxxxx_HELLO_B */ | |
760 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
761 | } | |
762 | ||
763 | /* for these 2 messages, we need to | |
764 | * ssl->enc_read_ctx re-init | |
765 | * ssl->s3->read_sequence zero | |
766 | * ssl->s3->read_mac_secret re-init | |
767 | * ssl->session->read_sym_enc assign | |
768 | * ssl->session->read_compression assign | |
769 | * ssl->session->read_hash assign | |
770 | */ | |
771 | int dtls1_send_change_cipher_spec(SSL *s, int a, int b) | |
772 | { | |
773 | unsigned char *p; | |
774 | ||
775 | if (s->state == a) | |
776 | { | |
777 | p=(unsigned char *)s->init_buf->data; | |
778 | *p++=SSL3_MT_CCS; | |
779 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
36d16f8e | 780 | s->init_num=DTLS1_CCS_HEADER_LENGTH; |
8711efb4 DSH |
781 | |
782 | if (s->version == DTLS1_BAD_VER) { | |
783 | s->d1->next_handshake_write_seq++; | |
784 | s2n(s->d1->handshake_write_seq,p); | |
785 | s->init_num+=2; | |
786 | } | |
787 | ||
36d16f8e BL |
788 | s->init_off=0; |
789 | ||
790 | dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, | |
791 | s->d1->handshake_write_seq, 0, 0); | |
792 | ||
793 | /* buffer the message to handle re-xmits */ | |
794 | dtls1_buffer_message(s, 1); | |
795 | ||
796 | s->state=b; | |
797 | } | |
798 | ||
799 | /* SSL3_ST_CW_CHANGE_B */ | |
800 | return(dtls1_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC)); | |
801 | } | |
802 | ||
803 | unsigned long dtls1_output_cert_chain(SSL *s, X509 *x) | |
804 | { | |
805 | unsigned char *p; | |
806 | int n,i; | |
807 | unsigned long l= 3 + DTLS1_HM_HEADER_LENGTH; | |
808 | BUF_MEM *buf; | |
809 | X509_STORE_CTX xs_ctx; | |
810 | X509_OBJECT obj; | |
811 | ||
812 | /* TLSv1 sends a chain with nothing in it, instead of an alert */ | |
813 | buf=s->init_buf; | |
814 | if (!BUF_MEM_grow_clean(buf,10)) | |
815 | { | |
beb056b3 | 816 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB); |
36d16f8e BL |
817 | return(0); |
818 | } | |
819 | if (x != NULL) | |
820 | { | |
821 | if(!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL)) | |
822 | { | |
beb056b3 | 823 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB); |
36d16f8e BL |
824 | return(0); |
825 | } | |
826 | ||
827 | for (;;) | |
828 | { | |
829 | n=i2d_X509(x,NULL); | |
90acf770 | 830 | if (!BUF_MEM_grow_clean(buf,(n+l+3))) |
36d16f8e | 831 | { |
beb056b3 | 832 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB); |
36d16f8e BL |
833 | return(0); |
834 | } | |
835 | p=(unsigned char *)&(buf->data[l]); | |
836 | l2n3(n,p); | |
837 | i2d_X509(x,&p); | |
838 | l+=n+3; | |
839 | if (X509_NAME_cmp(X509_get_subject_name(x), | |
840 | X509_get_issuer_name(x)) == 0) break; | |
841 | ||
842 | i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509, | |
843 | X509_get_issuer_name(x),&obj); | |
844 | if (i <= 0) break; | |
845 | x=obj.data.x509; | |
846 | /* Count is one too high since the X509_STORE_get uped the | |
847 | * ref count */ | |
848 | X509_free(x); | |
849 | } | |
850 | ||
851 | X509_STORE_CTX_cleanup(&xs_ctx); | |
852 | } | |
853 | ||
854 | /* Thawte special :-) */ | |
855 | if (s->ctx->extra_certs != NULL) | |
856 | for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++) | |
857 | { | |
858 | x=sk_X509_value(s->ctx->extra_certs,i); | |
859 | n=i2d_X509(x,NULL); | |
90acf770 | 860 | if (!BUF_MEM_grow_clean(buf,(n+l+3))) |
36d16f8e | 861 | { |
beb056b3 | 862 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB); |
36d16f8e BL |
863 | return(0); |
864 | } | |
865 | p=(unsigned char *)&(buf->data[l]); | |
866 | l2n3(n,p); | |
867 | i2d_X509(x,&p); | |
868 | l+=n+3; | |
869 | } | |
870 | ||
871 | l-= (3 + DTLS1_HM_HEADER_LENGTH); | |
872 | ||
873 | p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); | |
874 | l2n3(l,p); | |
875 | l+=3; | |
876 | p=(unsigned char *)&(buf->data[0]); | |
877 | p = dtls1_set_message_header(s, p, SSL3_MT_CERTIFICATE, l, 0, l); | |
878 | ||
879 | l+=DTLS1_HM_HEADER_LENGTH; | |
880 | return(l); | |
881 | } | |
882 | ||
883 | int dtls1_read_failed(SSL *s, int code) | |
54ef01b5 AP |
884 | { |
885 | DTLS1_STATE *state; | |
54ef01b5 AP |
886 | int send_alert = 0; |
887 | ||
888 | if ( code > 0) | |
889 | { | |
890 | fprintf( stderr, "invalid state reached %s:%d", __FILE__, __LINE__); | |
891 | return 1; | |
892 | } | |
893 | ||
eb38b26d | 894 | if (!dtls1_is_timer_expired(s)) |
54ef01b5 AP |
895 | { |
896 | /* not a timeout, none of our business, | |
897 | let higher layers handle this. in fact it's probably an error */ | |
898 | return code; | |
899 | } | |
900 | ||
901 | if ( ! SSL_in_init(s)) /* done, no need to send a retransmit */ | |
902 | { | |
903 | BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ); | |
904 | return code; | |
905 | } | |
906 | ||
eb38b26d | 907 | dtls1_double_timeout(s); |
54ef01b5 AP |
908 | state = s->d1; |
909 | state->timeout.num_alerts++; | |
910 | if ( state->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) | |
911 | { | |
912 | /* fail the connection, enough alerts have been sent */ | |
913 | SSLerr(SSL_F_DTLS1_READ_FAILED,SSL_R_READ_TIMEOUT_EXPIRED); | |
914 | return 0; | |
915 | } | |
916 | ||
917 | state->timeout.read_timeouts++; | |
918 | if ( state->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) | |
919 | { | |
920 | send_alert = 1; | |
921 | state->timeout.read_timeouts = 1; | |
922 | } | |
923 | ||
36d16f8e | 924 | |
36d16f8e | 925 | #if 0 /* for now, each alert contains only one record number */ |
54ef01b5 AP |
926 | item = pqueue_peek(state->rcvd_records); |
927 | if ( item ) | |
928 | { | |
929 | /* send an alert immediately for all the missing records */ | |
930 | } | |
931 | else | |
36d16f8e BL |
932 | #endif |
933 | ||
934 | #if 0 /* no more alert sending, just retransmit the last set of messages */ | |
54ef01b5 AP |
935 | if ( send_alert) |
936 | ssl3_send_alert(s,SSL3_AL_WARNING, | |
937 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); | |
36d16f8e BL |
938 | #endif |
939 | ||
54ef01b5 AP |
940 | return dtls1_retransmit_buffered_messages(s) ; |
941 | } | |
36d16f8e | 942 | |
e5fa864f DSH |
943 | int |
944 | dtls1_get_queue_priority(unsigned short seq, int is_ccs) | |
945 | { | |
946 | /* The index of the retransmission queue actually is the message sequence number, | |
947 | * since the queue only contains messages of a single handshake. However, the | |
948 | * ChangeCipherSpec has no message sequence number and so using only the sequence | |
949 | * will result in the CCS and Finished having the same index. To prevent this, | |
950 | * the sequence number is multiplied by 2. In case of a CCS 1 is subtracted. | |
951 | * This does not only differ CSS and Finished, it also maintains the order of the | |
952 | * index (important for priority queues) and fits in the unsigned short variable. | |
953 | */ | |
954 | return seq * 2 - is_ccs; | |
955 | } | |
36d16f8e | 956 | |
e5fa864f | 957 | int |
36d16f8e | 958 | dtls1_retransmit_buffered_messages(SSL *s) |
54ef01b5 AP |
959 | { |
960 | pqueue sent = s->d1->sent_messages; | |
961 | piterator iter; | |
962 | pitem *item; | |
963 | hm_fragment *frag; | |
964 | int found = 0; | |
965 | ||
966 | iter = pqueue_iterator(sent); | |
967 | ||
968 | for ( item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter)) | |
969 | { | |
970 | frag = (hm_fragment *)item->data; | |
e5fa864f | 971 | if ( dtls1_retransmit_message(s, |
ef236ec3 | 972 | (unsigned short)dtls1_get_queue_priority(frag->msg_header.seq, frag->msg_header.is_ccs), |
e5fa864f | 973 | 0, &found) <= 0 && found) |
54ef01b5 AP |
974 | { |
975 | fprintf(stderr, "dtls1_retransmit_message() failed\n"); | |
976 | return -1; | |
977 | } | |
978 | } | |
979 | ||
980 | return 1; | |
981 | } | |
36d16f8e | 982 | |
36d16f8e BL |
983 | int |
984 | dtls1_buffer_message(SSL *s, int is_ccs) | |
54ef01b5 AP |
985 | { |
986 | pitem *item; | |
987 | hm_fragment *frag; | |
988 | unsigned char seq64be[8]; | |
989 | ||
990 | /* this function is called immediately after a message has | |
991 | * been serialized */ | |
992 | OPENSSL_assert(s->init_off == 0); | |
993 | ||
994 | frag = dtls1_hm_fragment_new(s->init_num); | |
995 | ||
996 | memcpy(frag->fragment, s->init_buf->data, s->init_num); | |
997 | ||
998 | if ( is_ccs) | |
999 | { | |
1000 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + | |
8711efb4 | 1001 | ((s->version==DTLS1_VERSION)?DTLS1_CCS_HEADER_LENGTH:3) == (unsigned int)s->init_num); |
54ef01b5 AP |
1002 | } |
1003 | else | |
1004 | { | |
1005 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + | |
1006 | DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num); | |
1007 | } | |
1008 | ||
1009 | frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len; | |
1010 | frag->msg_header.seq = s->d1->w_msg_hdr.seq; | |
1011 | frag->msg_header.type = s->d1->w_msg_hdr.type; | |
1012 | frag->msg_header.frag_off = 0; | |
1013 | frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len; | |
1014 | frag->msg_header.is_ccs = is_ccs; | |
1015 | ||
e5fa864f DSH |
1016 | /* save current state*/ |
1017 | frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx; | |
1018 | frag->msg_header.saved_retransmit_state.write_hash = s->write_hash; | |
1019 | frag->msg_header.saved_retransmit_state.compress = s->compress; | |
1020 | frag->msg_header.saved_retransmit_state.session = s->session; | |
1021 | frag->msg_header.saved_retransmit_state.epoch = s->d1->w_epoch; | |
1022 | ||
54ef01b5 | 1023 | memset(seq64be,0,sizeof(seq64be)); |
e5fa864f DSH |
1024 | seq64be[6] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq, |
1025 | frag->msg_header.is_ccs)>>8); | |
1026 | seq64be[7] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq, | |
1027 | frag->msg_header.is_ccs)); | |
54ef01b5 AP |
1028 | |
1029 | item = pitem_new(seq64be, frag); | |
1030 | if ( item == NULL) | |
1031 | { | |
1032 | dtls1_hm_fragment_free(frag); | |
1033 | return 0; | |
1034 | } | |
36d16f8e BL |
1035 | |
1036 | #if 0 | |
54ef01b5 AP |
1037 | fprintf( stderr, "buffered messge: \ttype = %xx\n", msg_buf->type); |
1038 | fprintf( stderr, "\t\t\t\t\tlen = %d\n", msg_buf->len); | |
1039 | fprintf( stderr, "\t\t\t\t\tseq_num = %d\n", msg_buf->seq_num); | |
36d16f8e BL |
1040 | #endif |
1041 | ||
54ef01b5 AP |
1042 | pqueue_insert(s->d1->sent_messages, item); |
1043 | return 1; | |
1044 | } | |
36d16f8e BL |
1045 | |
1046 | int | |
1047 | dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off, | |
54ef01b5 AP |
1048 | int *found) |
1049 | { | |
1050 | int ret; | |
1051 | /* XDTLS: for now assuming that read/writes are blocking */ | |
1052 | pitem *item; | |
1053 | hm_fragment *frag ; | |
1054 | unsigned long header_length; | |
1055 | unsigned char seq64be[8]; | |
e5fa864f DSH |
1056 | struct dtls1_retransmit_state saved_state; |
1057 | unsigned char save_write_sequence[8]; | |
54ef01b5 AP |
1058 | |
1059 | /* | |
1060 | OPENSSL_assert(s->init_num == 0); | |
1061 | OPENSSL_assert(s->init_off == 0); | |
1062 | */ | |
1063 | ||
1064 | /* XDTLS: the requested message ought to be found, otherwise error */ | |
1065 | memset(seq64be,0,sizeof(seq64be)); | |
1066 | seq64be[6] = (unsigned char)(seq>>8); | |
1067 | seq64be[7] = (unsigned char)seq; | |
1068 | ||
1069 | item = pqueue_find(s->d1->sent_messages, seq64be); | |
1070 | if ( item == NULL) | |
1071 | { | |
1072 | fprintf(stderr, "retransmit: message %d non-existant\n", seq); | |
1073 | *found = 0; | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | *found = 1; | |
1078 | frag = (hm_fragment *)item->data; | |
1079 | ||
1080 | if ( frag->msg_header.is_ccs) | |
1081 | header_length = DTLS1_CCS_HEADER_LENGTH; | |
1082 | else | |
1083 | header_length = DTLS1_HM_HEADER_LENGTH; | |
1084 | ||
1085 | memcpy(s->init_buf->data, frag->fragment, | |
1086 | frag->msg_header.msg_len + header_length); | |
1087 | s->init_num = frag->msg_header.msg_len + header_length; | |
1088 | ||
1089 | dtls1_set_message_header_int(s, frag->msg_header.type, | |
1090 | frag->msg_header.msg_len, frag->msg_header.seq, 0, | |
1091 | frag->msg_header.frag_len); | |
1092 | ||
e5fa864f DSH |
1093 | /* save current state */ |
1094 | saved_state.enc_write_ctx = s->enc_write_ctx; | |
1095 | saved_state.write_hash = s->write_hash; | |
1096 | saved_state.compress = s->compress; | |
1097 | saved_state.session = s->session; | |
1098 | saved_state.epoch = s->d1->w_epoch; | |
1099 | saved_state.epoch = s->d1->w_epoch; | |
1100 | ||
54ef01b5 | 1101 | s->d1->retransmitting = 1; |
e5fa864f DSH |
1102 | |
1103 | /* restore state in which the message was originally sent */ | |
1104 | s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx; | |
1105 | s->write_hash = frag->msg_header.saved_retransmit_state.write_hash; | |
1106 | s->compress = frag->msg_header.saved_retransmit_state.compress; | |
1107 | s->session = frag->msg_header.saved_retransmit_state.session; | |
1108 | s->d1->w_epoch = frag->msg_header.saved_retransmit_state.epoch; | |
1109 | ||
1110 | if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1) | |
1111 | { | |
1112 | memcpy(save_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence)); | |
1113 | memcpy(s->s3->write_sequence, s->d1->last_write_sequence, sizeof(s->s3->write_sequence)); | |
1114 | } | |
1115 | ||
54ef01b5 | 1116 | ret = dtls1_do_write(s, frag->msg_header.is_ccs ? |
e5fa864f DSH |
1117 | SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE); |
1118 | ||
1119 | /* restore current state */ | |
1120 | s->enc_write_ctx = saved_state.enc_write_ctx; | |
1121 | s->write_hash = saved_state.write_hash; | |
1122 | s->compress = saved_state.compress; | |
1123 | s->session = saved_state.session; | |
1124 | s->d1->w_epoch = saved_state.epoch; | |
1125 | ||
1126 | if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1) | |
1127 | { | |
1128 | memcpy(s->d1->last_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence)); | |
1129 | memcpy(s->s3->write_sequence, save_write_sequence, sizeof(s->s3->write_sequence)); | |
1130 | } | |
1131 | ||
54ef01b5 AP |
1132 | s->d1->retransmitting = 0; |
1133 | ||
1134 | (void)BIO_flush(SSL_get_wbio(s)); | |
1135 | return ret; | |
1136 | } | |
36d16f8e BL |
1137 | |
1138 | /* call this function when the buffered messages are no longer needed */ | |
1139 | void | |
1140 | dtls1_clear_record_buffer(SSL *s) | |
54ef01b5 AP |
1141 | { |
1142 | pitem *item; | |
1143 | ||
1144 | for(item = pqueue_pop(s->d1->sent_messages); | |
1145 | item != NULL; item = pqueue_pop(s->d1->sent_messages)) | |
1146 | { | |
1147 | dtls1_hm_fragment_free((hm_fragment *)item->data); | |
1148 | pitem_free(item); | |
1149 | } | |
1150 | } | |
36d16f8e BL |
1151 | |
1152 | ||
1153 | unsigned char * | |
1154 | dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt, | |
54ef01b5 AP |
1155 | unsigned long len, unsigned long frag_off, unsigned long frag_len) |
1156 | { | |
1157 | if ( frag_off == 0) | |
1158 | { | |
1159 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
1160 | s->d1->next_handshake_write_seq++; | |
1161 | } | |
1162 | ||
1163 | dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq, | |
1164 | frag_off, frag_len); | |
1165 | ||
1166 | return p += DTLS1_HM_HEADER_LENGTH; | |
1167 | } | |
36d16f8e BL |
1168 | |
1169 | ||
1170 | /* don't actually do the writing, wait till the MTU has been retrieved */ | |
1171 | static void | |
1172 | dtls1_set_message_header_int(SSL *s, unsigned char mt, | |
54ef01b5 AP |
1173 | unsigned long len, unsigned short seq_num, unsigned long frag_off, |
1174 | unsigned long frag_len) | |
1175 | { | |
1176 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1177 | ||
1178 | msg_hdr->type = mt; | |
1179 | msg_hdr->msg_len = len; | |
1180 | msg_hdr->seq = seq_num; | |
1181 | msg_hdr->frag_off = frag_off; | |
1182 | msg_hdr->frag_len = frag_len; | |
1183 | } | |
36d16f8e BL |
1184 | |
1185 | static void | |
1186 | dtls1_fix_message_header(SSL *s, unsigned long frag_off, | |
54ef01b5 AP |
1187 | unsigned long frag_len) |
1188 | { | |
1189 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1190 | ||
1191 | msg_hdr->frag_off = frag_off; | |
1192 | msg_hdr->frag_len = frag_len; | |
1193 | } | |
36d16f8e BL |
1194 | |
1195 | static unsigned char * | |
1196 | dtls1_write_message_header(SSL *s, unsigned char *p) | |
54ef01b5 AP |
1197 | { |
1198 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1199 | ||
1200 | *p++ = msg_hdr->type; | |
1201 | l2n3(msg_hdr->msg_len, p); | |
1202 | ||
1203 | s2n(msg_hdr->seq, p); | |
1204 | l2n3(msg_hdr->frag_off, p); | |
1205 | l2n3(msg_hdr->frag_len, p); | |
1206 | ||
1207 | return p; | |
1208 | } | |
36d16f8e BL |
1209 | |
1210 | static unsigned int | |
1211 | dtls1_min_mtu(void) | |
54ef01b5 AP |
1212 | { |
1213 | return (g_probable_mtu[(sizeof(g_probable_mtu) / | |
1214 | sizeof(g_probable_mtu[0])) - 1]); | |
1215 | } | |
36d16f8e BL |
1216 | |
1217 | static unsigned int | |
1218 | dtls1_guess_mtu(unsigned int curr_mtu) | |
1219 | { | |
f920c5b5 | 1220 | unsigned int i; |
36d16f8e BL |
1221 | |
1222 | if ( curr_mtu == 0 ) | |
1223 | return g_probable_mtu[0] ; | |
1224 | ||
1225 | for ( i = 0; i < sizeof(g_probable_mtu)/sizeof(g_probable_mtu[0]); i++) | |
1226 | if ( curr_mtu > g_probable_mtu[i]) | |
1227 | return g_probable_mtu[i]; | |
54ef01b5 | 1228 | |
36d16f8e BL |
1229 | return curr_mtu; |
1230 | } | |
1231 | ||
1232 | void | |
1233 | dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr) | |
54ef01b5 AP |
1234 | { |
1235 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
1236 | msg_hdr->type = *(data++); | |
1237 | n2l3(data, msg_hdr->msg_len); | |
1238 | ||
1239 | n2s(data, msg_hdr->seq); | |
1240 | n2l3(data, msg_hdr->frag_off); | |
1241 | n2l3(data, msg_hdr->frag_len); | |
1242 | } | |
36d16f8e BL |
1243 | |
1244 | void | |
1245 | dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr) | |
54ef01b5 AP |
1246 | { |
1247 | memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st)); | |
1248 | ||
1249 | ccs_hdr->type = *(data++); | |
54ef01b5 | 1250 | } |