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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; | |
71af26b5 | 180 | unsigned int len, frag_off, mac_size, blocksize; |
36d16f8e BL |
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 | 227 | |
71af26b5 DSH |
228 | if (s->write_hash) |
229 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
230 | else | |
231 | mac_size = 0; | |
232 | ||
233 | if (s->enc_write_ctx && | |
234 | (EVP_CIPHER_mode( s->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE)) | |
235 | blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher); | |
236 | else | |
237 | blocksize = 0; | |
238 | ||
36d16f8e BL |
239 | frag_off = 0; |
240 | while( s->init_num) | |
241 | { | |
242 | curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) - | |
71af26b5 | 243 | DTLS1_RT_HEADER_LENGTH - mac_size - blocksize; |
36d16f8e BL |
244 | |
245 | if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH) | |
246 | { | |
247 | /* grr.. we could get an error if MTU picked was wrong */ | |
248 | ret = BIO_flush(SSL_get_wbio(s)); | |
249 | if ( ret <= 0) | |
250 | return ret; | |
71af26b5 DSH |
251 | curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH - |
252 | mac_size - blocksize; | |
36d16f8e BL |
253 | } |
254 | ||
255 | if ( s->init_num > curr_mtu) | |
256 | len = curr_mtu; | |
257 | else | |
258 | len = s->init_num; | |
259 | ||
260 | ||
261 | /* XDTLS: this function is too long. split out the CCS part */ | |
262 | if ( type == SSL3_RT_HANDSHAKE) | |
263 | { | |
264 | if ( s->init_off != 0) | |
265 | { | |
266 | OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH); | |
267 | s->init_off -= DTLS1_HM_HEADER_LENGTH; | |
268 | s->init_num += DTLS1_HM_HEADER_LENGTH; | |
269 | ||
54ef01b5 | 270 | /* write atleast DTLS1_HM_HEADER_LENGTH bytes */ |
36d16f8e BL |
271 | if ( len <= DTLS1_HM_HEADER_LENGTH) |
272 | len += DTLS1_HM_HEADER_LENGTH; | |
273 | } | |
54ef01b5 | 274 | |
36d16f8e BL |
275 | dtls1_fix_message_header(s, frag_off, |
276 | len - DTLS1_HM_HEADER_LENGTH); | |
277 | ||
4e321ffa | 278 | dtls1_write_message_header(s, (unsigned char *)&s->init_buf->data[s->init_off]); |
36d16f8e BL |
279 | |
280 | OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH); | |
281 | } | |
282 | ||
283 | ret=dtls1_write_bytes(s,type,&s->init_buf->data[s->init_off], | |
284 | len); | |
285 | if (ret < 0) | |
286 | { | |
287 | /* might need to update MTU here, but we don't know | |
288 | * which previous packet caused the failure -- so can't | |
289 | * really retransmit anything. continue as if everything | |
290 | * is fine and wait for an alert to handle the | |
291 | * retransmit | |
292 | */ | |
293 | if ( BIO_ctrl(SSL_get_wbio(s), | |
ff613640 | 294 | BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0 ) |
36d16f8e BL |
295 | s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), |
296 | BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); | |
297 | else | |
298 | return(-1); | |
299 | } | |
300 | else | |
301 | { | |
54ef01b5 | 302 | |
36d16f8e BL |
303 | /* bad if this assert fails, only part of the handshake |
304 | * message got sent. but why would this happen? */ | |
90acf770 | 305 | OPENSSL_assert(len == (unsigned int)ret); |
54ef01b5 | 306 | |
36d16f8e | 307 | if (type == SSL3_RT_HANDSHAKE && ! s->d1->retransmitting) |
90acf770 | 308 | { |
36d16f8e BL |
309 | /* should not be done for 'Hello Request's, but in that case |
310 | * we'll ignore the result anyway */ | |
e979c039 | 311 | unsigned char *p = (unsigned char *)&s->init_buf->data[s->init_off]; |
90acf770 | 312 | const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; |
e979c039 | 313 | int xlen; |
90acf770 | 314 | |
8711efb4 | 315 | if (frag_off == 0 && s->version != DTLS1_BAD_VER) |
90acf770 AP |
316 | { |
317 | /* reconstruct message header is if it | |
318 | * is being sent in single fragment */ | |
319 | *p++ = msg_hdr->type; | |
320 | l2n3(msg_hdr->msg_len,p); | |
321 | s2n (msg_hdr->seq,p); | |
322 | l2n3(0,p); | |
323 | l2n3(msg_hdr->msg_len,p); | |
324 | p -= DTLS1_HM_HEADER_LENGTH; | |
e979c039 | 325 | xlen = ret; |
90acf770 AP |
326 | } |
327 | else | |
328 | { | |
329 | p += DTLS1_HM_HEADER_LENGTH; | |
e979c039 | 330 | xlen = ret - DTLS1_HM_HEADER_LENGTH; |
90acf770 AP |
331 | } |
332 | ||
e979c039 | 333 | ssl3_finish_mac(s, p, xlen); |
90acf770 AP |
334 | } |
335 | ||
36d16f8e BL |
336 | if (ret == s->init_num) |
337 | { | |
338 | if (s->msg_callback) | |
339 | s->msg_callback(1, s->version, type, s->init_buf->data, | |
340 | (size_t)(s->init_off + s->init_num), s, | |
341 | s->msg_callback_arg); | |
342 | ||
343 | s->init_off = 0; /* done writing this message */ | |
344 | s->init_num = 0; | |
90acf770 | 345 | |
36d16f8e BL |
346 | return(1); |
347 | } | |
348 | s->init_off+=ret; | |
349 | s->init_num-=ret; | |
350 | frag_off += (ret -= DTLS1_HM_HEADER_LENGTH); | |
351 | } | |
352 | } | |
353 | return(0); | |
354 | } | |
355 | ||
356 | ||
357 | /* Obtain handshake message of message type 'mt' (any if mt == -1), | |
358 | * maximum acceptable body length 'max'. | |
359 | * Read an entire handshake message. Handshake messages arrive in | |
360 | * fragments. | |
361 | */ | |
beb056b3 | 362 | long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok) |
36d16f8e BL |
363 | { |
364 | int i, al; | |
90acf770 | 365 | struct hm_header_st *msg_hdr; |
36d16f8e BL |
366 | |
367 | /* s3->tmp is used to store messages that are unexpected, caused | |
368 | * by the absence of an optional handshake message */ | |
369 | if (s->s3->tmp.reuse_message) | |
370 | { | |
371 | s->s3->tmp.reuse_message=0; | |
372 | if ((mt >= 0) && (s->s3->tmp.message_type != mt)) | |
373 | { | |
374 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
beb056b3 | 375 | SSLerr(SSL_F_DTLS1_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE); |
36d16f8e BL |
376 | goto f_err; |
377 | } | |
378 | *ok=1; | |
379 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
380 | s->init_num = (int)s->s3->tmp.message_size; | |
381 | return s->init_num; | |
382 | } | |
54ef01b5 | 383 | |
90acf770 | 384 | msg_hdr = &s->d1->r_msg_hdr; |
36d16f8e BL |
385 | do |
386 | { | |
90acf770 | 387 | if ( msg_hdr->frag_off == 0) |
36d16f8e BL |
388 | { |
389 | /* s->d1->r_message_header.msg_len = 0; */ | |
90acf770 | 390 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); |
36d16f8e BL |
391 | } |
392 | ||
393 | i = dtls1_get_message_fragment(s, st1, stn, max, ok); | |
394 | if ( i == DTLS1_HM_BAD_FRAGMENT || | |
54ef01b5 | 395 | i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */ |
36d16f8e BL |
396 | continue; |
397 | else if ( i <= 0 && !*ok) | |
398 | return i; | |
399 | ||
90acf770 AP |
400 | /* Note that s->init_sum is used as a counter summing |
401 | * up fragments' lengths: as soon as they sum up to | |
402 | * handshake packet length, we assume we have got all | |
403 | * the fragments. Overlapping fragments would cause | |
404 | * premature termination, so we don't expect overlaps. | |
405 | * Well, handling overlaps would require something more | |
406 | * drastic. Indeed, as it is now there is no way to | |
407 | * tell if out-of-order fragment from the middle was | |
408 | * the last. '>=' is the best/least we can do to control | |
409 | * the potential damage caused by malformed overlaps. */ | |
410 | if ((unsigned int)s->init_num >= msg_hdr->msg_len) | |
36d16f8e | 411 | { |
e979c039 | 412 | unsigned char *p = (unsigned char *)s->init_buf->data; |
90acf770 AP |
413 | unsigned long msg_len = msg_hdr->msg_len; |
414 | ||
415 | /* reconstruct message header as if it was | |
416 | * sent in single fragment */ | |
417 | *(p++) = msg_hdr->type; | |
418 | l2n3(msg_len,p); | |
419 | s2n (msg_hdr->seq,p); | |
420 | l2n3(0,p); | |
421 | l2n3(msg_len,p); | |
8711efb4 DSH |
422 | if (s->version != DTLS1_BAD_VER) { |
423 | p -= DTLS1_HM_HEADER_LENGTH; | |
424 | msg_len += DTLS1_HM_HEADER_LENGTH; | |
425 | } | |
90acf770 AP |
426 | |
427 | ssl3_finish_mac(s, p, msg_len); | |
428 | if (s->msg_callback) | |
429 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
430 | p, msg_len, | |
431 | s, s->msg_callback_arg); | |
432 | ||
433 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
36d16f8e BL |
434 | |
435 | s->d1->handshake_read_seq++; | |
436 | /* we just read a handshake message from the other side: | |
437 | * this means that we don't need to retransmit of the | |
438 | * buffered messages. | |
439 | * XDTLS: may be able clear out this | |
440 | * buffer a little sooner (i.e if an out-of-order | |
441 | * handshake message/record is received at the record | |
442 | * layer. | |
443 | * XDTLS: exception is that the server needs to | |
444 | * know that change cipher spec and finished messages | |
445 | * have been received by the client before clearing this | |
446 | * buffer. this can simply be done by waiting for the | |
447 | * first data segment, but is there a better way? */ | |
448 | dtls1_clear_record_buffer(s); | |
449 | ||
54ef01b5 | 450 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; |
90acf770 | 451 | return s->init_num; |
36d16f8e BL |
452 | } |
453 | else | |
90acf770 | 454 | msg_hdr->frag_off = i; |
36d16f8e BL |
455 | } while(1) ; |
456 | ||
457 | f_err: | |
458 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
459 | *ok = 0; | |
460 | return -1; | |
461 | } | |
462 | ||
463 | ||
90acf770 AP |
464 | static int dtls1_preprocess_fragment(SSL *s,struct hm_header_st *msg_hdr,int max) |
465 | { | |
466 | size_t frag_off,frag_len,msg_len; | |
467 | ||
468 | msg_len = msg_hdr->msg_len; | |
469 | frag_off = msg_hdr->frag_off; | |
470 | frag_len = msg_hdr->frag_len; | |
471 | ||
472 | /* sanity checking */ | |
473 | if ( (frag_off+frag_len) > msg_len) | |
474 | { | |
475 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
476 | return SSL_AD_ILLEGAL_PARAMETER; | |
477 | } | |
478 | ||
479 | if ( (frag_off+frag_len) > (unsigned long)max) | |
480 | { | |
481 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
482 | return SSL_AD_ILLEGAL_PARAMETER; | |
483 | } | |
484 | ||
485 | if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */ | |
486 | { | |
487 | /* msg_len is limited to 2^24, but is effectively checked | |
488 | * against max above */ | |
489 | if (!BUF_MEM_grow_clean(s->init_buf,msg_len+DTLS1_HM_HEADER_LENGTH)) | |
490 | { | |
491 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,ERR_R_BUF_LIB); | |
492 | return SSL_AD_INTERNAL_ERROR; | |
493 | } | |
494 | ||
495 | s->s3->tmp.message_size = msg_len; | |
496 | s->d1->r_msg_hdr.msg_len = msg_len; | |
497 | s->s3->tmp.message_type = msg_hdr->type; | |
498 | s->d1->r_msg_hdr.type = msg_hdr->type; | |
499 | s->d1->r_msg_hdr.seq = msg_hdr->seq; | |
500 | } | |
501 | else if (msg_len != s->d1->r_msg_hdr.msg_len) | |
502 | { | |
503 | /* They must be playing with us! BTW, failure to enforce | |
504 | * upper limit would open possibility for buffer overrun. */ | |
505 | SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE); | |
506 | return SSL_AD_ILLEGAL_PARAMETER; | |
507 | } | |
508 | ||
509 | return 0; /* no error */ | |
510 | } | |
511 | ||
512 | ||
36d16f8e | 513 | static int |
90acf770 | 514 | dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok) |
54ef01b5 AP |
515 | { |
516 | /* (0) check whether the desired fragment is available | |
517 | * if so: | |
518 | * (1) copy over the fragment to s->init_buf->data[] | |
519 | * (2) update s->init_num | |
520 | */ | |
521 | pitem *item; | |
522 | hm_fragment *frag; | |
90acf770 | 523 | int al; |
54ef01b5 | 524 | |
90acf770 | 525 | *ok = 0; |
54ef01b5 AP |
526 | item = pqueue_peek(s->d1->buffered_messages); |
527 | if ( item == NULL) | |
528 | return 0; | |
529 | ||
530 | frag = (hm_fragment *)item->data; | |
531 | ||
90acf770 | 532 | if ( s->d1->handshake_read_seq == frag->msg_header.seq) |
54ef01b5 | 533 | { |
715feb31 | 534 | unsigned long frag_len = frag->msg_header.frag_len; |
54ef01b5 | 535 | pqueue_pop(s->d1->buffered_messages); |
54ef01b5 | 536 | |
90acf770 AP |
537 | al=dtls1_preprocess_fragment(s,&frag->msg_header,max); |
538 | ||
539 | if (al==0) /* no alert */ | |
540 | { | |
e979c039 | 541 | unsigned char *p = (unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH; |
90acf770 AP |
542 | memcpy(&p[frag->msg_header.frag_off], |
543 | frag->fragment,frag->msg_header.frag_len); | |
544 | } | |
54ef01b5 | 545 | |
90acf770 | 546 | dtls1_hm_fragment_free(frag); |
54ef01b5 AP |
547 | pitem_free(item); |
548 | ||
90acf770 AP |
549 | if (al==0) |
550 | { | |
551 | *ok = 1; | |
715feb31 | 552 | return frag_len; |
90acf770 AP |
553 | } |
554 | ||
555 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
556 | s->init_num = 0; | |
557 | *ok = 0; | |
558 | return -1; | |
54ef01b5 AP |
559 | } |
560 | else | |
561 | return 0; | |
562 | } | |
36d16f8e BL |
563 | |
564 | ||
565 | static int | |
90acf770 | 566 | dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok) |
36d16f8e | 567 | { |
90acf770 | 568 | int i=-1; |
54ef01b5 AP |
569 | hm_fragment *frag = NULL; |
570 | pitem *item = NULL; | |
571 | unsigned char seq64be[8]; | |
90acf770 | 572 | unsigned long frag_len = msg_hdr->frag_len; |
36d16f8e | 573 | |
90acf770 | 574 | if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len) |
54ef01b5 | 575 | goto err; |
36d16f8e | 576 | |
481547f0 DSH |
577 | /* Try to find item in queue, to prevent duplicate entries */ |
578 | memset(seq64be,0,sizeof(seq64be)); | |
579 | seq64be[6] = (unsigned char) (msg_hdr->seq>>8); | |
580 | seq64be[7] = (unsigned char) msg_hdr->seq; | |
581 | item = pqueue_find(s->d1->buffered_messages, seq64be); | |
582 | ||
583 | /* Discard the message if sequence number was already there, is | |
58f41a92 DSH |
584 | * too far in the future, already in the queue or if we received |
585 | * a FINISHED before the SERVER_HELLO, which then must be a stale | |
586 | * retransmit. | |
587 | */ | |
481547f0 | 588 | if (msg_hdr->seq <= s->d1->handshake_read_seq || |
58f41a92 DSH |
589 | msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL || |
590 | (s->d1->handshake_read_seq == 0 && msg_hdr->type == SSL3_MT_FINISHED)) | |
90acf770 AP |
591 | { |
592 | unsigned char devnull [256]; | |
593 | ||
594 | while (frag_len) | |
595 | { | |
596 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
597 | devnull, | |
598 | frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0); | |
599 | if (i<=0) goto err; | |
600 | frag_len -= i; | |
601 | } | |
602 | } | |
603 | ||
90acf770 AP |
604 | if (frag_len) |
605 | { | |
e5fa864f DSH |
606 | frag = dtls1_hm_fragment_new(frag_len); |
607 | if ( frag == NULL) | |
608 | goto err; | |
609 | ||
610 | memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); | |
611 | ||
90acf770 AP |
612 | /* read the body of the fragment (header has already been read */ |
613 | i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, | |
614 | frag->fragment,frag_len,0); | |
615 | if (i<=0 || (unsigned long)i!=frag_len) | |
616 | goto err; | |
90acf770 | 617 | |
e5fa864f DSH |
618 | memset(seq64be,0,sizeof(seq64be)); |
619 | seq64be[6] = (unsigned char)(msg_hdr->seq>>8); | |
620 | seq64be[7] = (unsigned char)(msg_hdr->seq); | |
188b0579 | 621 | |
e5fa864f DSH |
622 | item = pitem_new(seq64be, frag); |
623 | if ( item == NULL) | |
624 | goto err; | |
625 | ||
626 | pqueue_insert(s->d1->buffered_messages, item); | |
627 | } | |
36d16f8e | 628 | |
90acf770 | 629 | return DTLS1_HM_FRAGMENT_RETRY; |
36d16f8e BL |
630 | |
631 | err: | |
54ef01b5 AP |
632 | if ( frag != NULL) dtls1_hm_fragment_free(frag); |
633 | if ( item != NULL) OPENSSL_free(item); | |
54ef01b5 | 634 | *ok = 0; |
90acf770 | 635 | return i; |
54ef01b5 | 636 | } |
36d16f8e BL |
637 | |
638 | ||
beb056b3 | 639 | static long |
36d16f8e BL |
640 | dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok) |
641 | { | |
90acf770 | 642 | unsigned char wire[DTLS1_HM_HEADER_LENGTH]; |
36d16f8e BL |
643 | unsigned long l, frag_off, frag_len; |
644 | int i,al; | |
645 | struct hm_header_st msg_hdr; | |
54ef01b5 AP |
646 | |
647 | /* see if we have the required fragment already */ | |
90acf770 AP |
648 | if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok) |
649 | { | |
650 | if (*ok) s->init_num += frag_len; | |
651 | return frag_len; | |
652 | } | |
36d16f8e | 653 | |
54ef01b5 | 654 | /* read handshake message header */ |
90acf770 | 655 | i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,wire, |
36d16f8e BL |
656 | DTLS1_HM_HEADER_LENGTH, 0); |
657 | if (i <= 0) /* nbio, or an error */ | |
658 | { | |
659 | s->rwstate=SSL_READING; | |
660 | *ok = 0; | |
661 | return i; | |
662 | } | |
36d16f8e BL |
663 | OPENSSL_assert(i == DTLS1_HM_HEADER_LENGTH); |
664 | ||
54ef01b5 | 665 | /* parse the message fragment header */ |
90acf770 | 666 | dtls1_get_message_header(wire, &msg_hdr); |
54ef01b5 AP |
667 | |
668 | /* | |
669 | * if this is a future (or stale) message it gets buffered | |
670 | * (or dropped)--no further processing at this time | |
671 | */ | |
672 | if ( msg_hdr.seq != s->d1->handshake_read_seq) | |
673 | return dtls1_process_out_of_seq_message(s, &msg_hdr, ok); | |
674 | ||
675 | l = msg_hdr.msg_len; | |
676 | frag_off = msg_hdr.frag_off; | |
36d16f8e BL |
677 | frag_len = msg_hdr.frag_len; |
678 | ||
36d16f8e | 679 | if (!s->server && s->d1->r_msg_hdr.frag_off == 0 && |
90acf770 | 680 | wire[0] == SSL3_MT_HELLO_REQUEST) |
54ef01b5 AP |
681 | { |
682 | /* The server may always send 'Hello Request' messages -- | |
683 | * we are doing a handshake anyway now, so ignore them | |
684 | * if their format is correct. Does not count for | |
685 | * 'Finished' MAC. */ | |
90acf770 | 686 | if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) |
54ef01b5 AP |
687 | { |
688 | if (s->msg_callback) | |
689 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
90acf770 | 690 | wire, DTLS1_HM_HEADER_LENGTH, s, |
54ef01b5 AP |
691 | s->msg_callback_arg); |
692 | ||
693 | s->init_num = 0; | |
694 | return dtls1_get_message_fragment(s, st1, stn, | |
695 | max, ok); | |
696 | } | |
697 | else /* Incorrectly formated Hello request */ | |
698 | { | |
699 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
700 | SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE); | |
701 | goto f_err; | |
702 | } | |
703 | } | |
704 | ||
90acf770 | 705 | if ((al=dtls1_preprocess_fragment(s,&msg_hdr,max))) |
54ef01b5 | 706 | goto f_err; |
36d16f8e BL |
707 | |
708 | /* XDTLS: ressurect this when restart is in place */ | |
709 | s->state=stn; | |
54ef01b5 | 710 | |
36d16f8e BL |
711 | if ( frag_len > 0) |
712 | { | |
e979c039 | 713 | unsigned char *p=(unsigned char *)s->init_buf->data+DTLS1_HM_HEADER_LENGTH; |
90acf770 | 714 | |
36d16f8e | 715 | i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, |
90acf770 | 716 | &p[frag_off],frag_len,0); |
54ef01b5 | 717 | /* XDTLS: fix this--message fragments cannot span multiple packets */ |
36d16f8e BL |
718 | if (i <= 0) |
719 | { | |
720 | s->rwstate=SSL_READING; | |
721 | *ok = 0; | |
722 | return i; | |
723 | } | |
724 | } | |
725 | else | |
726 | i = 0; | |
727 | ||
54ef01b5 AP |
728 | /* XDTLS: an incorrectly formatted fragment should cause the |
729 | * handshake to fail */ | |
6c61726b | 730 | OPENSSL_assert(i == (int)frag_len); |
36d16f8e | 731 | |
90acf770 | 732 | *ok = 1; |
36d16f8e | 733 | |
90acf770 AP |
734 | /* Note that s->init_num is *not* used as current offset in |
735 | * s->init_buf->data, but as a counter summing up fragments' | |
736 | * lengths: as soon as they sum up to handshake packet | |
737 | * length, we assume we have got all the fragments. */ | |
738 | s->init_num += frag_len; | |
739 | return frag_len; | |
36d16f8e BL |
740 | |
741 | f_err: | |
742 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
54ef01b5 | 743 | s->init_num = 0; |
90acf770 | 744 | |
36d16f8e BL |
745 | *ok=0; |
746 | return(-1); | |
747 | } | |
748 | ||
749 | int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen) | |
750 | { | |
751 | unsigned char *p,*d; | |
752 | int i; | |
753 | unsigned long l; | |
754 | ||
755 | if (s->state == a) | |
756 | { | |
757 | d=(unsigned char *)s->init_buf->data; | |
758 | p= &(d[DTLS1_HM_HEADER_LENGTH]); | |
759 | ||
760 | i=s->method->ssl3_enc->final_finish_mac(s, | |
36d16f8e BL |
761 | sender,slen,s->s3->tmp.finish_md); |
762 | s->s3->tmp.finish_md_len = i; | |
763 | memcpy(p, s->s3->tmp.finish_md, i); | |
764 | p+=i; | |
765 | l=i; | |
766 | ||
49968440 DSH |
767 | /* Copy the finished so we can use it for |
768 | * renegotiation checks | |
769 | */ | |
770 | if(s->type == SSL_ST_CONNECT) | |
771 | { | |
772 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); | |
773 | memcpy(s->s3->previous_client_finished, | |
774 | s->s3->tmp.finish_md, i); | |
775 | s->s3->previous_client_finished_len=i; | |
776 | } | |
777 | else | |
778 | { | |
779 | OPENSSL_assert(i <= EVP_MAX_MD_SIZE); | |
780 | memcpy(s->s3->previous_server_finished, | |
781 | s->s3->tmp.finish_md, i); | |
782 | s->s3->previous_server_finished_len=i; | |
783 | } | |
784 | ||
36d16f8e BL |
785 | #ifdef OPENSSL_SYS_WIN16 |
786 | /* MSVC 1.5 does not clear the top bytes of the word unless | |
787 | * I do this. | |
788 | */ | |
789 | l&=0xffff; | |
790 | #endif | |
791 | ||
792 | d = dtls1_set_message_header(s, d, SSL3_MT_FINISHED, l, 0, l); | |
793 | s->init_num=(int)l+DTLS1_HM_HEADER_LENGTH; | |
794 | s->init_off=0; | |
795 | ||
796 | /* buffer the message to handle re-xmits */ | |
797 | dtls1_buffer_message(s, 0); | |
54ef01b5 | 798 | |
36d16f8e BL |
799 | s->state=b; |
800 | } | |
801 | ||
802 | /* SSL3_ST_SEND_xxxxxx_HELLO_B */ | |
803 | return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); | |
804 | } | |
805 | ||
806 | /* for these 2 messages, we need to | |
807 | * ssl->enc_read_ctx re-init | |
808 | * ssl->s3->read_sequence zero | |
809 | * ssl->s3->read_mac_secret re-init | |
810 | * ssl->session->read_sym_enc assign | |
811 | * ssl->session->read_compression assign | |
812 | * ssl->session->read_hash assign | |
813 | */ | |
814 | int dtls1_send_change_cipher_spec(SSL *s, int a, int b) | |
815 | { | |
816 | unsigned char *p; | |
817 | ||
818 | if (s->state == a) | |
819 | { | |
820 | p=(unsigned char *)s->init_buf->data; | |
821 | *p++=SSL3_MT_CCS; | |
822 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
36d16f8e | 823 | s->init_num=DTLS1_CCS_HEADER_LENGTH; |
8711efb4 DSH |
824 | |
825 | if (s->version == DTLS1_BAD_VER) { | |
826 | s->d1->next_handshake_write_seq++; | |
827 | s2n(s->d1->handshake_write_seq,p); | |
828 | s->init_num+=2; | |
829 | } | |
830 | ||
36d16f8e BL |
831 | s->init_off=0; |
832 | ||
833 | dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, | |
834 | s->d1->handshake_write_seq, 0, 0); | |
835 | ||
836 | /* buffer the message to handle re-xmits */ | |
837 | dtls1_buffer_message(s, 1); | |
838 | ||
839 | s->state=b; | |
840 | } | |
841 | ||
842 | /* SSL3_ST_CW_CHANGE_B */ | |
843 | return(dtls1_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC)); | |
844 | } | |
845 | ||
d2f6d282 DSH |
846 | static int dtls1_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x) |
847 | { | |
4b06d778 DSH |
848 | int n; |
849 | unsigned char *p; | |
d2f6d282 | 850 | |
4b06d778 DSH |
851 | n=i2d_X509(x,NULL); |
852 | if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3))) | |
853 | { | |
854 | SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF,ERR_R_BUF_LIB); | |
855 | return 0; | |
856 | } | |
857 | p=(unsigned char *)&(buf->data[*l]); | |
858 | l2n3(n,p); | |
859 | i2d_X509(x,&p); | |
860 | *l+=n+3; | |
d2f6d282 | 861 | |
4b06d778 | 862 | return 1; |
d2f6d282 | 863 | } |
36d16f8e BL |
864 | unsigned long dtls1_output_cert_chain(SSL *s, X509 *x) |
865 | { | |
866 | unsigned char *p; | |
d2f6d282 | 867 | int i; |
36d16f8e BL |
868 | unsigned long l= 3 + DTLS1_HM_HEADER_LENGTH; |
869 | BUF_MEM *buf; | |
36d16f8e BL |
870 | |
871 | /* TLSv1 sends a chain with nothing in it, instead of an alert */ | |
872 | buf=s->init_buf; | |
873 | if (!BUF_MEM_grow_clean(buf,10)) | |
874 | { | |
beb056b3 | 875 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB); |
36d16f8e BL |
876 | return(0); |
877 | } | |
878 | if (x != NULL) | |
879 | { | |
d2f6d282 DSH |
880 | X509_STORE_CTX xs_ctx; |
881 | ||
882 | if (!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,x,NULL)) | |
883 | { | |
884 | SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB); | |
885 | return(0); | |
886 | } | |
887 | ||
888 | X509_verify_cert(&xs_ctx); | |
889 | for (i=0; i < sk_X509_num(xs_ctx.chain); i++) | |
890 | { | |
891 | x = sk_X509_value(xs_ctx.chain, i); | |
892 | ||
893 | if (!dtls1_add_cert_to_buf(buf, &l, x)) | |
894 | { | |
895 | X509_STORE_CTX_cleanup(&xs_ctx); | |
896 | return 0; | |
897 | } | |
898 | } | |
899 | X509_STORE_CTX_cleanup(&xs_ctx); | |
900 | } | |
901 | /* Thawte special :-) */ | |
36d16f8e BL |
902 | for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++) |
903 | { | |
904 | x=sk_X509_value(s->ctx->extra_certs,i); | |
d2f6d282 DSH |
905 | if (!dtls1_add_cert_to_buf(buf, &l, x)) |
906 | return 0; | |
36d16f8e BL |
907 | } |
908 | ||
909 | l-= (3 + DTLS1_HM_HEADER_LENGTH); | |
910 | ||
911 | p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); | |
912 | l2n3(l,p); | |
913 | l+=3; | |
914 | p=(unsigned char *)&(buf->data[0]); | |
915 | p = dtls1_set_message_header(s, p, SSL3_MT_CERTIFICATE, l, 0, l); | |
916 | ||
917 | l+=DTLS1_HM_HEADER_LENGTH; | |
918 | return(l); | |
919 | } | |
920 | ||
921 | int dtls1_read_failed(SSL *s, int code) | |
54ef01b5 | 922 | { |
54ef01b5 AP |
923 | if ( code > 0) |
924 | { | |
925 | fprintf( stderr, "invalid state reached %s:%d", __FILE__, __LINE__); | |
926 | return 1; | |
927 | } | |
928 | ||
eb38b26d | 929 | if (!dtls1_is_timer_expired(s)) |
54ef01b5 AP |
930 | { |
931 | /* not a timeout, none of our business, | |
932 | let higher layers handle this. in fact it's probably an error */ | |
933 | return code; | |
934 | } | |
935 | ||
936 | if ( ! SSL_in_init(s)) /* done, no need to send a retransmit */ | |
937 | { | |
938 | BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ); | |
939 | return code; | |
940 | } | |
941 | ||
36d16f8e | 942 | #if 0 /* for now, each alert contains only one record number */ |
54ef01b5 AP |
943 | item = pqueue_peek(state->rcvd_records); |
944 | if ( item ) | |
945 | { | |
946 | /* send an alert immediately for all the missing records */ | |
947 | } | |
948 | else | |
36d16f8e BL |
949 | #endif |
950 | ||
951 | #if 0 /* no more alert sending, just retransmit the last set of messages */ | |
b972fbaa DSH |
952 | if ( state->timeout.read_timeouts >= DTLS1_TMO_READ_COUNT) |
953 | ssl3_send_alert(s,SSL3_AL_WARNING, | |
954 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); | |
36d16f8e BL |
955 | #endif |
956 | ||
b972fbaa | 957 | return dtls1_handle_timeout(s); |
54ef01b5 | 958 | } |
36d16f8e | 959 | |
e5fa864f DSH |
960 | int |
961 | dtls1_get_queue_priority(unsigned short seq, int is_ccs) | |
962 | { | |
963 | /* The index of the retransmission queue actually is the message sequence number, | |
964 | * since the queue only contains messages of a single handshake. However, the | |
965 | * ChangeCipherSpec has no message sequence number and so using only the sequence | |
966 | * will result in the CCS and Finished having the same index. To prevent this, | |
967 | * the sequence number is multiplied by 2. In case of a CCS 1 is subtracted. | |
968 | * This does not only differ CSS and Finished, it also maintains the order of the | |
969 | * index (important for priority queues) and fits in the unsigned short variable. | |
970 | */ | |
971 | return seq * 2 - is_ccs; | |
972 | } | |
36d16f8e | 973 | |
e5fa864f | 974 | int |
36d16f8e | 975 | dtls1_retransmit_buffered_messages(SSL *s) |
54ef01b5 AP |
976 | { |
977 | pqueue sent = s->d1->sent_messages; | |
978 | piterator iter; | |
979 | pitem *item; | |
980 | hm_fragment *frag; | |
981 | int found = 0; | |
982 | ||
983 | iter = pqueue_iterator(sent); | |
984 | ||
985 | for ( item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter)) | |
986 | { | |
987 | frag = (hm_fragment *)item->data; | |
e5fa864f | 988 | if ( dtls1_retransmit_message(s, |
ef236ec3 | 989 | (unsigned short)dtls1_get_queue_priority(frag->msg_header.seq, frag->msg_header.is_ccs), |
e5fa864f | 990 | 0, &found) <= 0 && found) |
54ef01b5 AP |
991 | { |
992 | fprintf(stderr, "dtls1_retransmit_message() failed\n"); | |
993 | return -1; | |
994 | } | |
995 | } | |
996 | ||
997 | return 1; | |
998 | } | |
36d16f8e | 999 | |
36d16f8e BL |
1000 | int |
1001 | dtls1_buffer_message(SSL *s, int is_ccs) | |
54ef01b5 AP |
1002 | { |
1003 | pitem *item; | |
1004 | hm_fragment *frag; | |
1005 | unsigned char seq64be[8]; | |
1006 | ||
1007 | /* this function is called immediately after a message has | |
1008 | * been serialized */ | |
1009 | OPENSSL_assert(s->init_off == 0); | |
1010 | ||
1011 | frag = dtls1_hm_fragment_new(s->init_num); | |
1012 | ||
1013 | memcpy(frag->fragment, s->init_buf->data, s->init_num); | |
1014 | ||
1015 | if ( is_ccs) | |
1016 | { | |
1017 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + | |
8711efb4 | 1018 | ((s->version==DTLS1_VERSION)?DTLS1_CCS_HEADER_LENGTH:3) == (unsigned int)s->init_num); |
54ef01b5 AP |
1019 | } |
1020 | else | |
1021 | { | |
1022 | OPENSSL_assert(s->d1->w_msg_hdr.msg_len + | |
1023 | DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num); | |
1024 | } | |
1025 | ||
1026 | frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len; | |
1027 | frag->msg_header.seq = s->d1->w_msg_hdr.seq; | |
1028 | frag->msg_header.type = s->d1->w_msg_hdr.type; | |
1029 | frag->msg_header.frag_off = 0; | |
1030 | frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len; | |
1031 | frag->msg_header.is_ccs = is_ccs; | |
1032 | ||
e5fa864f DSH |
1033 | /* save current state*/ |
1034 | frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx; | |
1035 | frag->msg_header.saved_retransmit_state.write_hash = s->write_hash; | |
1036 | frag->msg_header.saved_retransmit_state.compress = s->compress; | |
1037 | frag->msg_header.saved_retransmit_state.session = s->session; | |
1038 | frag->msg_header.saved_retransmit_state.epoch = s->d1->w_epoch; | |
1039 | ||
54ef01b5 | 1040 | memset(seq64be,0,sizeof(seq64be)); |
e5fa864f DSH |
1041 | seq64be[6] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq, |
1042 | frag->msg_header.is_ccs)>>8); | |
1043 | seq64be[7] = (unsigned char)(dtls1_get_queue_priority(frag->msg_header.seq, | |
1044 | frag->msg_header.is_ccs)); | |
54ef01b5 AP |
1045 | |
1046 | item = pitem_new(seq64be, frag); | |
1047 | if ( item == NULL) | |
1048 | { | |
1049 | dtls1_hm_fragment_free(frag); | |
1050 | return 0; | |
1051 | } | |
36d16f8e BL |
1052 | |
1053 | #if 0 | |
54ef01b5 AP |
1054 | fprintf( stderr, "buffered messge: \ttype = %xx\n", msg_buf->type); |
1055 | fprintf( stderr, "\t\t\t\t\tlen = %d\n", msg_buf->len); | |
1056 | fprintf( stderr, "\t\t\t\t\tseq_num = %d\n", msg_buf->seq_num); | |
36d16f8e BL |
1057 | #endif |
1058 | ||
54ef01b5 AP |
1059 | pqueue_insert(s->d1->sent_messages, item); |
1060 | return 1; | |
1061 | } | |
36d16f8e BL |
1062 | |
1063 | int | |
1064 | dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off, | |
54ef01b5 AP |
1065 | int *found) |
1066 | { | |
1067 | int ret; | |
1068 | /* XDTLS: for now assuming that read/writes are blocking */ | |
1069 | pitem *item; | |
1070 | hm_fragment *frag ; | |
1071 | unsigned long header_length; | |
1072 | unsigned char seq64be[8]; | |
e5fa864f DSH |
1073 | struct dtls1_retransmit_state saved_state; |
1074 | unsigned char save_write_sequence[8]; | |
54ef01b5 AP |
1075 | |
1076 | /* | |
1077 | OPENSSL_assert(s->init_num == 0); | |
1078 | OPENSSL_assert(s->init_off == 0); | |
1079 | */ | |
1080 | ||
1081 | /* XDTLS: the requested message ought to be found, otherwise error */ | |
1082 | memset(seq64be,0,sizeof(seq64be)); | |
1083 | seq64be[6] = (unsigned char)(seq>>8); | |
1084 | seq64be[7] = (unsigned char)seq; | |
1085 | ||
1086 | item = pqueue_find(s->d1->sent_messages, seq64be); | |
1087 | if ( item == NULL) | |
1088 | { | |
1089 | fprintf(stderr, "retransmit: message %d non-existant\n", seq); | |
1090 | *found = 0; | |
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | *found = 1; | |
1095 | frag = (hm_fragment *)item->data; | |
1096 | ||
1097 | if ( frag->msg_header.is_ccs) | |
1098 | header_length = DTLS1_CCS_HEADER_LENGTH; | |
1099 | else | |
1100 | header_length = DTLS1_HM_HEADER_LENGTH; | |
1101 | ||
1102 | memcpy(s->init_buf->data, frag->fragment, | |
1103 | frag->msg_header.msg_len + header_length); | |
1104 | s->init_num = frag->msg_header.msg_len + header_length; | |
1105 | ||
1106 | dtls1_set_message_header_int(s, frag->msg_header.type, | |
1107 | frag->msg_header.msg_len, frag->msg_header.seq, 0, | |
1108 | frag->msg_header.frag_len); | |
1109 | ||
e5fa864f DSH |
1110 | /* save current state */ |
1111 | saved_state.enc_write_ctx = s->enc_write_ctx; | |
1112 | saved_state.write_hash = s->write_hash; | |
1113 | saved_state.compress = s->compress; | |
1114 | saved_state.session = s->session; | |
1115 | saved_state.epoch = s->d1->w_epoch; | |
1116 | saved_state.epoch = s->d1->w_epoch; | |
1117 | ||
54ef01b5 | 1118 | s->d1->retransmitting = 1; |
e5fa864f DSH |
1119 | |
1120 | /* restore state in which the message was originally sent */ | |
1121 | s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx; | |
1122 | s->write_hash = frag->msg_header.saved_retransmit_state.write_hash; | |
1123 | s->compress = frag->msg_header.saved_retransmit_state.compress; | |
1124 | s->session = frag->msg_header.saved_retransmit_state.session; | |
1125 | s->d1->w_epoch = frag->msg_header.saved_retransmit_state.epoch; | |
1126 | ||
1127 | if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1) | |
1128 | { | |
1129 | memcpy(save_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence)); | |
1130 | memcpy(s->s3->write_sequence, s->d1->last_write_sequence, sizeof(s->s3->write_sequence)); | |
1131 | } | |
1132 | ||
54ef01b5 | 1133 | ret = dtls1_do_write(s, frag->msg_header.is_ccs ? |
e5fa864f DSH |
1134 | SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE); |
1135 | ||
1136 | /* restore current state */ | |
1137 | s->enc_write_ctx = saved_state.enc_write_ctx; | |
1138 | s->write_hash = saved_state.write_hash; | |
1139 | s->compress = saved_state.compress; | |
1140 | s->session = saved_state.session; | |
1141 | s->d1->w_epoch = saved_state.epoch; | |
1142 | ||
1143 | if (frag->msg_header.saved_retransmit_state.epoch == saved_state.epoch - 1) | |
1144 | { | |
1145 | memcpy(s->d1->last_write_sequence, s->s3->write_sequence, sizeof(s->s3->write_sequence)); | |
1146 | memcpy(s->s3->write_sequence, save_write_sequence, sizeof(s->s3->write_sequence)); | |
1147 | } | |
1148 | ||
54ef01b5 AP |
1149 | s->d1->retransmitting = 0; |
1150 | ||
1151 | (void)BIO_flush(SSL_get_wbio(s)); | |
1152 | return ret; | |
1153 | } | |
36d16f8e BL |
1154 | |
1155 | /* call this function when the buffered messages are no longer needed */ | |
1156 | void | |
1157 | dtls1_clear_record_buffer(SSL *s) | |
54ef01b5 AP |
1158 | { |
1159 | pitem *item; | |
1160 | ||
1161 | for(item = pqueue_pop(s->d1->sent_messages); | |
1162 | item != NULL; item = pqueue_pop(s->d1->sent_messages)) | |
1163 | { | |
1164 | dtls1_hm_fragment_free((hm_fragment *)item->data); | |
1165 | pitem_free(item); | |
1166 | } | |
1167 | } | |
36d16f8e BL |
1168 | |
1169 | ||
1170 | unsigned char * | |
1171 | dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt, | |
54ef01b5 AP |
1172 | unsigned long len, unsigned long frag_off, unsigned long frag_len) |
1173 | { | |
1174 | if ( frag_off == 0) | |
1175 | { | |
1176 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
1177 | s->d1->next_handshake_write_seq++; | |
1178 | } | |
1179 | ||
1180 | dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq, | |
1181 | frag_off, frag_len); | |
1182 | ||
1183 | return p += DTLS1_HM_HEADER_LENGTH; | |
1184 | } | |
36d16f8e BL |
1185 | |
1186 | ||
1187 | /* don't actually do the writing, wait till the MTU has been retrieved */ | |
1188 | static void | |
1189 | dtls1_set_message_header_int(SSL *s, unsigned char mt, | |
54ef01b5 AP |
1190 | unsigned long len, unsigned short seq_num, unsigned long frag_off, |
1191 | unsigned long frag_len) | |
1192 | { | |
1193 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1194 | ||
1195 | msg_hdr->type = mt; | |
1196 | msg_hdr->msg_len = len; | |
1197 | msg_hdr->seq = seq_num; | |
1198 | msg_hdr->frag_off = frag_off; | |
1199 | msg_hdr->frag_len = frag_len; | |
1200 | } | |
36d16f8e BL |
1201 | |
1202 | static void | |
1203 | dtls1_fix_message_header(SSL *s, unsigned long frag_off, | |
54ef01b5 AP |
1204 | unsigned long frag_len) |
1205 | { | |
1206 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1207 | ||
1208 | msg_hdr->frag_off = frag_off; | |
1209 | msg_hdr->frag_len = frag_len; | |
1210 | } | |
36d16f8e BL |
1211 | |
1212 | static unsigned char * | |
1213 | dtls1_write_message_header(SSL *s, unsigned char *p) | |
54ef01b5 AP |
1214 | { |
1215 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1216 | ||
1217 | *p++ = msg_hdr->type; | |
1218 | l2n3(msg_hdr->msg_len, p); | |
1219 | ||
1220 | s2n(msg_hdr->seq, p); | |
1221 | l2n3(msg_hdr->frag_off, p); | |
1222 | l2n3(msg_hdr->frag_len, p); | |
1223 | ||
1224 | return p; | |
1225 | } | |
36d16f8e BL |
1226 | |
1227 | static unsigned int | |
1228 | dtls1_min_mtu(void) | |
54ef01b5 AP |
1229 | { |
1230 | return (g_probable_mtu[(sizeof(g_probable_mtu) / | |
1231 | sizeof(g_probable_mtu[0])) - 1]); | |
1232 | } | |
36d16f8e BL |
1233 | |
1234 | static unsigned int | |
1235 | dtls1_guess_mtu(unsigned int curr_mtu) | |
1236 | { | |
f920c5b5 | 1237 | unsigned int i; |
36d16f8e BL |
1238 | |
1239 | if ( curr_mtu == 0 ) | |
1240 | return g_probable_mtu[0] ; | |
1241 | ||
1242 | for ( i = 0; i < sizeof(g_probable_mtu)/sizeof(g_probable_mtu[0]); i++) | |
1243 | if ( curr_mtu > g_probable_mtu[i]) | |
1244 | return g_probable_mtu[i]; | |
54ef01b5 | 1245 | |
36d16f8e BL |
1246 | return curr_mtu; |
1247 | } | |
1248 | ||
1249 | void | |
1250 | dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr) | |
54ef01b5 AP |
1251 | { |
1252 | memset(msg_hdr, 0x00, sizeof(struct hm_header_st)); | |
1253 | msg_hdr->type = *(data++); | |
1254 | n2l3(data, msg_hdr->msg_len); | |
1255 | ||
1256 | n2s(data, msg_hdr->seq); | |
1257 | n2l3(data, msg_hdr->frag_off); | |
1258 | n2l3(data, msg_hdr->frag_len); | |
1259 | } | |
36d16f8e BL |
1260 | |
1261 | void | |
1262 | dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr) | |
54ef01b5 AP |
1263 | { |
1264 | memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st)); | |
1265 | ||
1266 | ccs_hdr->type = *(data++); | |
54ef01b5 | 1267 | } |