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0f113f3e | 1 | /* |
f5afac4b | 2 | * Copyright 2005-2021 The OpenSSL Project Authors. All Rights Reserved. |
0f113f3e | 3 | * |
2c18d164 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
846e33c7 RS |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
36d16f8e BL |
8 | */ |
9 | ||
10 | #include <limits.h> | |
11 | #include <string.h> | |
12 | #include <stdio.h> | |
706457b7 DMSP |
13 | #include "../ssl_local.h" |
14 | #include "statem_local.h" | |
67dc995e | 15 | #include "internal/cryptlib.h" |
36d16f8e | 16 | #include <openssl/buffer.h> |
36d16f8e BL |
17 | #include <openssl/objects.h> |
18 | #include <openssl/evp.h> | |
19 | #include <openssl/x509.h> | |
20 | ||
934e22e8 DSH |
21 | #define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8) |
22 | ||
23 | #define RSMBLY_BITMASK_MARK(bitmask, start, end) { \ | |
0f113f3e MC |
24 | if ((end) - (start) <= 8) { \ |
25 | long ii; \ | |
26 | for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \ | |
27 | } else { \ | |
28 | long ii; \ | |
29 | bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \ | |
30 | for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \ | |
31 | bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \ | |
32 | } } | |
934e22e8 DSH |
33 | |
34 | #define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \ | |
0f113f3e | 35 | long ii; \ |
0f113f3e MC |
36 | is_complete = 1; \ |
37 | if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \ | |
38 | if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \ | |
39 | if (bitmask[ii] != 0xff) { is_complete = 0; break; } } | |
934e22e8 | 40 | |
0f113f3e MC |
41 | static unsigned char bitmask_start_values[] = |
42 | { 0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80 }; | |
43 | static unsigned char bitmask_end_values[] = | |
44 | { 0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f }; | |
36d16f8e | 45 | |
7ee8627f MC |
46 | static void dtls1_fix_message_header(SSL *s, size_t frag_off, |
47 | size_t frag_len); | |
0f113f3e | 48 | static unsigned char *dtls1_write_message_header(SSL *s, unsigned char *p); |
36d16f8e | 49 | static void dtls1_set_message_header_int(SSL *s, unsigned char mt, |
7ee8627f | 50 | size_t len, |
0f113f3e | 51 | unsigned short seq_num, |
7ee8627f MC |
52 | size_t frag_off, |
53 | size_t frag_len); | |
54 | static int dtls_get_reassembled_message(SSL *s, int *errtype, size_t *len); | |
0f113f3e | 55 | |
7ee8627f | 56 | static hm_fragment *dtls1_hm_fragment_new(size_t frag_len, int reassembly) |
0f113f3e MC |
57 | { |
58 | hm_fragment *frag = NULL; | |
59 | unsigned char *buf = NULL; | |
60 | unsigned char *bitmask = NULL; | |
61 | ||
cdb10bae | 62 | if ((frag = OPENSSL_malloc(sizeof(*frag))) == NULL) { |
6849b73c | 63 | ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE); |
0f113f3e | 64 | return NULL; |
cdb10bae | 65 | } |
0f113f3e MC |
66 | |
67 | if (frag_len) { | |
cdb10bae | 68 | if ((buf = OPENSSL_malloc(frag_len)) == NULL) { |
6849b73c | 69 | ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
70 | OPENSSL_free(frag); |
71 | return NULL; | |
72 | } | |
73 | } | |
74 | ||
75 | /* zero length fragment gets zero frag->fragment */ | |
76 | frag->fragment = buf; | |
77 | ||
78 | /* Initialize reassembly bitmask if necessary */ | |
79 | if (reassembly) { | |
b51bce94 | 80 | bitmask = OPENSSL_zalloc(RSMBLY_BITMASK_SIZE(frag_len)); |
0f113f3e | 81 | if (bitmask == NULL) { |
6849b73c | 82 | ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE); |
b548a1f1 | 83 | OPENSSL_free(buf); |
0f113f3e MC |
84 | OPENSSL_free(frag); |
85 | return NULL; | |
86 | } | |
0f113f3e MC |
87 | } |
88 | ||
89 | frag->reassembly = bitmask; | |
90 | ||
91 | return frag; | |
92 | } | |
36d16f8e | 93 | |
8a35dbb6 | 94 | void dtls1_hm_fragment_free(hm_fragment *frag) |
0f113f3e | 95 | { |
25aaa98a RS |
96 | if (!frag) |
97 | return; | |
0f113f3e MC |
98 | if (frag->msg_header.is_ccs) { |
99 | EVP_CIPHER_CTX_free(frag->msg_header. | |
100 | saved_retransmit_state.enc_write_ctx); | |
bfb0641f | 101 | EVP_MD_CTX_free(frag->msg_header.saved_retransmit_state.write_hash); |
0f113f3e | 102 | } |
b548a1f1 RS |
103 | OPENSSL_free(frag->fragment); |
104 | OPENSSL_free(frag->reassembly); | |
0f113f3e MC |
105 | OPENSSL_free(frag); |
106 | } | |
36d16f8e | 107 | |
0f113f3e MC |
108 | /* |
109 | * send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or | |
110 | * SSL3_RT_CHANGE_CIPHER_SPEC) | |
111 | */ | |
6abb0d1f | 112 | int dtls1_do_write(SSL *s, int type) |
0f113f3e MC |
113 | { |
114 | int ret; | |
7ee8627f MC |
115 | size_t written; |
116 | size_t curr_mtu; | |
0f113f3e | 117 | int retry = 1; |
7ee8627f | 118 | size_t len, frag_off, mac_size, blocksize, used_len; |
0f113f3e MC |
119 | |
120 | if (!dtls1_query_mtu(s)) | |
121 | return -1; | |
122 | ||
50b4a9ba SGM |
123 | if (s->d1->mtu < dtls1_min_mtu(s)) |
124 | /* should have something reasonable now */ | |
125 | return -1; | |
0f113f3e | 126 | |
380a522f MC |
127 | if (s->init_off == 0 && type == SSL3_RT_HANDSHAKE) { |
128 | if (!ossl_assert(s->init_num == | |
129 | s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH)) | |
130 | return -1; | |
131 | } | |
0f113f3e MC |
132 | |
133 | if (s->write_hash) { | |
134 | if (s->enc_write_ctx | |
f6c95e46 | 135 | && (EVP_CIPHER_flags(EVP_CIPHER_CTX_get0_cipher(s->enc_write_ctx)) & |
3e166c13 | 136 | EVP_CIPH_FLAG_AEAD_CIPHER) != 0) |
0f113f3e MC |
137 | mac_size = 0; |
138 | else | |
139 | mac_size = EVP_MD_CTX_size(s->write_hash); | |
140 | } else | |
141 | mac_size = 0; | |
142 | ||
143 | if (s->enc_write_ctx && | |
144 | (EVP_CIPHER_CTX_mode(s->enc_write_ctx) == EVP_CIPH_CBC_MODE)) | |
846ec07d | 145 | blocksize = 2 * EVP_CIPHER_CTX_block_size(s->enc_write_ctx); |
0f113f3e MC |
146 | else |
147 | blocksize = 0; | |
148 | ||
149 | frag_off = 0; | |
67f60be8 MC |
150 | s->rwstate = SSL_NOTHING; |
151 | ||
0f113f3e MC |
152 | /* s->init_num shouldn't ever be < 0...but just in case */ |
153 | while (s->init_num > 0) { | |
2ad226e8 MC |
154 | if (type == SSL3_RT_HANDSHAKE && s->init_off != 0) { |
155 | /* We must be writing a fragment other than the first one */ | |
156 | ||
157 | if (frag_off > 0) { | |
158 | /* This is the first attempt at writing out this fragment */ | |
159 | ||
160 | if (s->init_off <= DTLS1_HM_HEADER_LENGTH) { | |
161 | /* | |
162 | * Each fragment that was already sent must at least have | |
163 | * contained the message header plus one other byte. | |
164 | * Therefore |init_off| must have progressed by at least | |
165 | * |DTLS1_HM_HEADER_LENGTH + 1| bytes. If not something went | |
166 | * wrong. | |
167 | */ | |
168 | return -1; | |
169 | } | |
170 | ||
171 | /* | |
172 | * Adjust |init_off| and |init_num| to allow room for a new | |
173 | * message header for this fragment. | |
174 | */ | |
175 | s->init_off -= DTLS1_HM_HEADER_LENGTH; | |
176 | s->init_num += DTLS1_HM_HEADER_LENGTH; | |
177 | } else { | |
178 | /* | |
179 | * We must have been called again after a retry so use the | |
180 | * fragment offset from our last attempt. We do not need | |
181 | * to adjust |init_off| and |init_num| as above, because | |
182 | * that should already have been done before the retry. | |
183 | */ | |
184 | frag_off = s->d1->w_msg_hdr.frag_off; | |
185 | } | |
186 | } | |
187 | ||
2e7dc7cd | 188 | used_len = BIO_wpending(s->wbio) + DTLS1_RT_HEADER_LENGTH |
0f113f3e MC |
189 | + mac_size + blocksize; |
190 | if (s->d1->mtu > used_len) | |
191 | curr_mtu = s->d1->mtu - used_len; | |
192 | else | |
193 | curr_mtu = 0; | |
194 | ||
195 | if (curr_mtu <= DTLS1_HM_HEADER_LENGTH) { | |
196 | /* | |
197 | * grr.. we could get an error if MTU picked was wrong | |
198 | */ | |
2e7dc7cd | 199 | ret = BIO_flush(s->wbio); |
67f60be8 MC |
200 | if (ret <= 0) { |
201 | s->rwstate = SSL_WRITING; | |
0f113f3e | 202 | return ret; |
67f60be8 | 203 | } |
0f113f3e MC |
204 | used_len = DTLS1_RT_HEADER_LENGTH + mac_size + blocksize; |
205 | if (s->d1->mtu > used_len + DTLS1_HM_HEADER_LENGTH) { | |
206 | curr_mtu = s->d1->mtu - used_len; | |
207 | } else { | |
208 | /* Shouldn't happen */ | |
209 | return -1; | |
210 | } | |
211 | } | |
212 | ||
213 | /* | |
214 | * We just checked that s->init_num > 0 so this cast should be safe | |
215 | */ | |
216 | if (((unsigned int)s->init_num) > curr_mtu) | |
217 | len = curr_mtu; | |
218 | else | |
219 | len = s->init_num; | |
220 | ||
aefb9256 MC |
221 | if (len > s->max_send_fragment) |
222 | len = s->max_send_fragment; | |
223 | ||
0f113f3e MC |
224 | /* |
225 | * XDTLS: this function is too long. split out the CCS part | |
226 | */ | |
227 | if (type == SSL3_RT_HANDSHAKE) { | |
0f113f3e MC |
228 | if (len < DTLS1_HM_HEADER_LENGTH) { |
229 | /* | |
230 | * len is so small that we really can't do anything sensible | |
231 | * so fail | |
232 | */ | |
233 | return -1; | |
234 | } | |
a230b26e | 235 | dtls1_fix_message_header(s, frag_off, len - DTLS1_HM_HEADER_LENGTH); |
0f113f3e MC |
236 | |
237 | dtls1_write_message_header(s, | |
238 | (unsigned char *)&s->init_buf-> | |
239 | data[s->init_off]); | |
240 | } | |
241 | ||
7ee8627f MC |
242 | ret = dtls1_write_bytes(s, type, &s->init_buf->data[s->init_off], len, |
243 | &written); | |
0f113f3e MC |
244 | if (ret < 0) { |
245 | /* | |
246 | * might need to update MTU here, but we don't know which | |
247 | * previous packet caused the failure -- so can't really | |
248 | * retransmit anything. continue as if everything is fine and | |
249 | * wait for an alert to handle the retransmit | |
250 | */ | |
251 | if (retry && BIO_ctrl(SSL_get_wbio(s), | |
252 | BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0) { | |
253 | if (!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) { | |
254 | if (!dtls1_query_mtu(s)) | |
255 | return -1; | |
256 | /* Have one more go */ | |
257 | retry = 0; | |
258 | } else | |
259 | return -1; | |
260 | } else { | |
380a522f | 261 | return -1; |
0f113f3e MC |
262 | } |
263 | } else { | |
264 | ||
265 | /* | |
266 | * bad if this assert fails, only part of the handshake message | |
267 | * got sent. but why would this happen? | |
268 | */ | |
380a522f MC |
269 | if (!ossl_assert(len == written)) |
270 | return -1; | |
0f113f3e MC |
271 | |
272 | if (type == SSL3_RT_HANDSHAKE && !s->d1->retransmitting) { | |
273 | /* | |
274 | * should not be done for 'Hello Request's, but in that case | |
275 | * we'll ignore the result anyway | |
276 | */ | |
277 | unsigned char *p = | |
278 | (unsigned char *)&s->init_buf->data[s->init_off]; | |
279 | const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
7ee8627f | 280 | size_t xlen; |
0f113f3e MC |
281 | |
282 | if (frag_off == 0 && s->version != DTLS1_BAD_VER) { | |
283 | /* | |
284 | * reconstruct message header is if it is being sent in | |
285 | * single fragment | |
286 | */ | |
287 | *p++ = msg_hdr->type; | |
288 | l2n3(msg_hdr->msg_len, p); | |
289 | s2n(msg_hdr->seq, p); | |
290 | l2n3(0, p); | |
291 | l2n3(msg_hdr->msg_len, p); | |
292 | p -= DTLS1_HM_HEADER_LENGTH; | |
7ee8627f | 293 | xlen = written; |
0f113f3e MC |
294 | } else { |
295 | p += DTLS1_HM_HEADER_LENGTH; | |
7ee8627f | 296 | xlen = written - DTLS1_HM_HEADER_LENGTH; |
0f113f3e MC |
297 | } |
298 | ||
d166ed8c DSH |
299 | if (!ssl3_finish_mac(s, p, xlen)) |
300 | return -1; | |
0f113f3e MC |
301 | } |
302 | ||
7ee8627f | 303 | if (written == s->init_num) { |
0f113f3e MC |
304 | if (s->msg_callback) |
305 | s->msg_callback(1, s->version, type, s->init_buf->data, | |
306 | (size_t)(s->init_off + s->init_num), s, | |
307 | s->msg_callback_arg); | |
308 | ||
309 | s->init_off = 0; /* done writing this message */ | |
310 | s->init_num = 0; | |
311 | ||
7ee8627f | 312 | return 1; |
0f113f3e | 313 | } |
7ee8627f MC |
314 | s->init_off += written; |
315 | s->init_num -= written; | |
316 | written -= DTLS1_HM_HEADER_LENGTH; | |
317 | frag_off += written; | |
2ad226e8 MC |
318 | |
319 | /* | |
320 | * We save the fragment offset for the next fragment so we have it | |
321 | * available in case of an IO retry. We don't know the length of the | |
322 | * next fragment yet so just set that to 0 for now. It will be | |
323 | * updated again later. | |
324 | */ | |
325 | dtls1_fix_message_header(s, frag_off, 0); | |
0f113f3e MC |
326 | } |
327 | } | |
7ee8627f | 328 | return 0; |
0f113f3e MC |
329 | } |
330 | ||
eda75751 | 331 | int dtls_get_message(SSL *s, int *mt, size_t *len) |
76af3037 MC |
332 | { |
333 | struct hm_header_st *msg_hdr; | |
334 | unsigned char *p; | |
7ee8627f MC |
335 | size_t msg_len; |
336 | size_t tmplen; | |
337 | int errtype; | |
76af3037 MC |
338 | |
339 | msg_hdr = &s->d1->r_msg_hdr; | |
340 | memset(msg_hdr, 0, sizeof(*msg_hdr)); | |
341 | ||
342 | again: | |
7ee8627f MC |
343 | if (!dtls_get_reassembled_message(s, &errtype, &tmplen)) { |
344 | if (errtype == DTLS1_HM_BAD_FRAGMENT | |
345 | || errtype == DTLS1_HM_FRAGMENT_RETRY) { | |
346 | /* bad fragment received */ | |
347 | goto again; | |
348 | } | |
76af3037 MC |
349 | return 0; |
350 | } | |
351 | ||
555cbb32 | 352 | *mt = s->s3.tmp.message_type; |
76af3037 MC |
353 | |
354 | p = (unsigned char *)s->init_buf->data; | |
7ee8627f | 355 | *len = s->init_num; |
76af3037 MC |
356 | |
357 | if (*mt == SSL3_MT_CHANGE_CIPHER_SPEC) { | |
358 | if (s->msg_callback) { | |
359 | s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, | |
360 | p, 1, s, s->msg_callback_arg); | |
361 | } | |
362 | /* | |
363 | * This isn't a real handshake message so skip the processing below. | |
364 | */ | |
365 | return 1; | |
366 | } | |
367 | ||
368 | msg_len = msg_hdr->msg_len; | |
369 | ||
370 | /* reconstruct message header */ | |
371 | *(p++) = msg_hdr->type; | |
372 | l2n3(msg_len, p); | |
373 | s2n(msg_hdr->seq, p); | |
374 | l2n3(0, p); | |
375 | l2n3(msg_len, p); | |
376 | if (s->version != DTLS1_BAD_VER) { | |
377 | p -= DTLS1_HM_HEADER_LENGTH; | |
378 | msg_len += DTLS1_HM_HEADER_LENGTH; | |
379 | } | |
380 | ||
5d671101 MC |
381 | /* |
382 | * If receiving Finished, record MAC of prior handshake messages for | |
383 | * Finished verification. | |
384 | */ | |
385 | if (*mt == SSL3_MT_FINISHED && !ssl3_take_mac(s)) { | |
386 | /* SSLfatal() already called */ | |
387 | return 0; | |
388 | } | |
389 | ||
d166ed8c DSH |
390 | if (!ssl3_finish_mac(s, p, msg_len)) |
391 | return 0; | |
76af3037 MC |
392 | if (s->msg_callback) |
393 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
394 | p, msg_len, s, s->msg_callback_arg); | |
395 | ||
396 | memset(msg_hdr, 0, sizeof(*msg_hdr)); | |
397 | ||
398 | s->d1->handshake_read_seq++; | |
399 | ||
76af3037 | 400 | s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH; |
76af3037 MC |
401 | |
402 | return 1; | |
403 | } | |
404 | ||
48c054fe MC |
405 | /* |
406 | * dtls1_max_handshake_message_len returns the maximum number of bytes | |
407 | * permitted in a DTLS handshake message for |s|. The minimum is 16KB, but | |
408 | * may be greater if the maximum certificate list size requires it. | |
409 | */ | |
348240c6 | 410 | static size_t dtls1_max_handshake_message_len(const SSL *s) |
48c054fe | 411 | { |
348240c6 MC |
412 | size_t max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH; |
413 | if (max_len < s->max_cert_list) | |
48c054fe MC |
414 | return s->max_cert_list; |
415 | return max_len; | |
416 | } | |
417 | ||
76af3037 | 418 | static int dtls1_preprocess_fragment(SSL *s, struct hm_header_st *msg_hdr) |
0f113f3e MC |
419 | { |
420 | size_t frag_off, frag_len, msg_len; | |
421 | ||
422 | msg_len = msg_hdr->msg_len; | |
423 | frag_off = msg_hdr->frag_off; | |
424 | frag_len = msg_hdr->frag_len; | |
425 | ||
426 | /* sanity checking */ | |
48c054fe MC |
427 | if ((frag_off + frag_len) > msg_len |
428 | || msg_len > dtls1_max_handshake_message_len(s)) { | |
c48ffbcc | 429 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_EXCESSIVE_MESSAGE_SIZE); |
d273b60b | 430 | return 0; |
0f113f3e MC |
431 | } |
432 | ||
0f113f3e MC |
433 | if (s->d1->r_msg_hdr.frag_off == 0) { /* first fragment */ |
434 | /* | |
48c054fe MC |
435 | * msg_len is limited to 2^24, but is effectively checked against |
436 | * dtls_max_handshake_message_len(s) above | |
0f113f3e | 437 | */ |
a230b26e | 438 | if (!BUF_MEM_grow_clean(s->init_buf, msg_len + DTLS1_HM_HEADER_LENGTH)) { |
c48ffbcc | 439 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_BUF_LIB); |
d273b60b | 440 | return 0; |
0f113f3e MC |
441 | } |
442 | ||
555cbb32 | 443 | s->s3.tmp.message_size = msg_len; |
0f113f3e | 444 | s->d1->r_msg_hdr.msg_len = msg_len; |
555cbb32 | 445 | s->s3.tmp.message_type = msg_hdr->type; |
0f113f3e MC |
446 | s->d1->r_msg_hdr.type = msg_hdr->type; |
447 | s->d1->r_msg_hdr.seq = msg_hdr->seq; | |
448 | } else if (msg_len != s->d1->r_msg_hdr.msg_len) { | |
449 | /* | |
450 | * They must be playing with us! BTW, failure to enforce upper limit | |
451 | * would open possibility for buffer overrun. | |
452 | */ | |
c48ffbcc | 453 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_EXCESSIVE_MESSAGE_SIZE); |
d273b60b | 454 | return 0; |
0f113f3e MC |
455 | } |
456 | ||
d273b60b | 457 | return 1; |
0f113f3e | 458 | } |
90acf770 | 459 | |
d273b60b MC |
460 | /* |
461 | * Returns 1 if there is a buffered fragment available, 0 if not, or -1 on a | |
462 | * fatal error. | |
463 | */ | |
7ee8627f | 464 | static int dtls1_retrieve_buffered_fragment(SSL *s, size_t *len) |
0f113f3e | 465 | { |
50e735f9 MC |
466 | /*- |
467 | * (0) check whether the desired fragment is available | |
468 | * if so: | |
469 | * (1) copy over the fragment to s->init_buf->data[] | |
470 | * (2) update s->init_num | |
471 | */ | |
0f113f3e MC |
472 | pitem *item; |
473 | hm_fragment *frag; | |
d273b60b | 474 | int ret; |
0f113f3e | 475 | |
f5c7f5df MC |
476 | do { |
477 | item = pqueue_peek(s->d1->buffered_messages); | |
478 | if (item == NULL) | |
479 | return 0; | |
480 | ||
481 | frag = (hm_fragment *)item->data; | |
482 | ||
483 | if (frag->msg_header.seq < s->d1->handshake_read_seq) { | |
484 | /* This is a stale message that has been buffered so clear it */ | |
485 | pqueue_pop(s->d1->buffered_messages); | |
486 | dtls1_hm_fragment_free(frag); | |
487 | pitem_free(item); | |
488 | item = NULL; | |
489 | frag = NULL; | |
490 | } | |
491 | } while (item == NULL); | |
0f113f3e MC |
492 | |
493 | /* Don't return if reassembly still in progress */ | |
494 | if (frag->reassembly != NULL) | |
495 | return 0; | |
496 | ||
497 | if (s->d1->handshake_read_seq == frag->msg_header.seq) { | |
7ee8627f | 498 | size_t frag_len = frag->msg_header.frag_len; |
0f113f3e MC |
499 | pqueue_pop(s->d1->buffered_messages); |
500 | ||
d273b60b MC |
501 | /* Calls SSLfatal() as required */ |
502 | ret = dtls1_preprocess_fragment(s, &frag->msg_header); | |
0f113f3e | 503 | |
a925e7db | 504 | if (ret && frag->msg_header.frag_len > 0) { |
0f113f3e MC |
505 | unsigned char *p = |
506 | (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
507 | memcpy(&p[frag->msg_header.frag_off], frag->fragment, | |
508 | frag->msg_header.frag_len); | |
509 | } | |
510 | ||
511 | dtls1_hm_fragment_free(frag); | |
512 | pitem_free(item); | |
513 | ||
d273b60b | 514 | if (ret) { |
7ee8627f MC |
515 | *len = frag_len; |
516 | return 1; | |
0f113f3e MC |
517 | } |
518 | ||
d273b60b | 519 | /* Fatal error */ |
0f113f3e | 520 | s->init_num = 0; |
d273b60b | 521 | return -1; |
7ee8627f MC |
522 | } else { |
523 | return 0; | |
524 | } | |
0f113f3e MC |
525 | } |
526 | ||
934e22e8 | 527 | static int |
7ee8627f | 528 | dtls1_reassemble_fragment(SSL *s, const struct hm_header_st *msg_hdr) |
0f113f3e MC |
529 | { |
530 | hm_fragment *frag = NULL; | |
531 | pitem *item = NULL; | |
532 | int i = -1, is_complete; | |
533 | unsigned char seq64be[8]; | |
7ee8627f | 534 | size_t frag_len = msg_hdr->frag_len; |
54105ddd | 535 | size_t readbytes; |
0f113f3e MC |
536 | |
537 | if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len || | |
538 | msg_hdr->msg_len > dtls1_max_handshake_message_len(s)) | |
539 | goto err; | |
540 | ||
7ee8627f | 541 | if (frag_len == 0) { |
0f113f3e | 542 | return DTLS1_HM_FRAGMENT_RETRY; |
7ee8627f | 543 | } |
0f113f3e MC |
544 | |
545 | /* Try to find item in queue */ | |
546 | memset(seq64be, 0, sizeof(seq64be)); | |
547 | seq64be[6] = (unsigned char)(msg_hdr->seq >> 8); | |
548 | seq64be[7] = (unsigned char)msg_hdr->seq; | |
549 | item = pqueue_find(s->d1->buffered_messages, seq64be); | |
550 | ||
551 | if (item == NULL) { | |
552 | frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1); | |
553 | if (frag == NULL) | |
554 | goto err; | |
555 | memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); | |
556 | frag->msg_header.frag_len = frag->msg_header.msg_len; | |
557 | frag->msg_header.frag_off = 0; | |
558 | } else { | |
559 | frag = (hm_fragment *)item->data; | |
560 | if (frag->msg_header.msg_len != msg_hdr->msg_len) { | |
561 | item = NULL; | |
562 | frag = NULL; | |
563 | goto err; | |
564 | } | |
565 | } | |
566 | ||
567 | /* | |
568 | * If message is already reassembled, this must be a retransmit and can | |
569 | * be dropped. In this case item != NULL and so frag does not need to be | |
570 | * freed. | |
571 | */ | |
572 | if (frag->reassembly == NULL) { | |
573 | unsigned char devnull[256]; | |
574 | ||
575 | while (frag_len) { | |
657da85e | 576 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL, |
0f113f3e MC |
577 | devnull, |
578 | frag_len > | |
579 | sizeof(devnull) ? sizeof(devnull) : | |
54105ddd | 580 | frag_len, 0, &readbytes); |
0f113f3e MC |
581 | if (i <= 0) |
582 | goto err; | |
54105ddd | 583 | frag_len -= readbytes; |
0f113f3e MC |
584 | } |
585 | return DTLS1_HM_FRAGMENT_RETRY; | |
586 | } | |
587 | ||
588 | /* read the body of the fragment (header has already been read */ | |
657da85e | 589 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL, |
0f113f3e | 590 | frag->fragment + msg_hdr->frag_off, |
54105ddd MC |
591 | frag_len, 0, &readbytes); |
592 | if (i <= 0 || readbytes != frag_len) | |
0f113f3e MC |
593 | i = -1; |
594 | if (i <= 0) | |
595 | goto err; | |
596 | ||
597 | RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off, | |
598 | (long)(msg_hdr->frag_off + frag_len)); | |
599 | ||
380a522f MC |
600 | if (!ossl_assert(msg_hdr->msg_len > 0)) |
601 | goto err; | |
0f113f3e MC |
602 | RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len, |
603 | is_complete); | |
604 | ||
605 | if (is_complete) { | |
606 | OPENSSL_free(frag->reassembly); | |
607 | frag->reassembly = NULL; | |
608 | } | |
609 | ||
610 | if (item == NULL) { | |
611 | item = pitem_new(seq64be, frag); | |
612 | if (item == NULL) { | |
613 | i = -1; | |
614 | goto err; | |
615 | } | |
616 | ||
617 | item = pqueue_insert(s->d1->buffered_messages, item); | |
618 | /* | |
619 | * pqueue_insert fails iff a duplicate item is inserted. However, | |
620 | * |item| cannot be a duplicate. If it were, |pqueue_find|, above, | |
621 | * would have returned it and control would never have reached this | |
622 | * branch. | |
623 | */ | |
380a522f MC |
624 | if (!ossl_assert(item != NULL)) |
625 | goto err; | |
0f113f3e MC |
626 | } |
627 | ||
628 | return DTLS1_HM_FRAGMENT_RETRY; | |
629 | ||
630 | err: | |
25aaa98a | 631 | if (item == NULL) |
0f113f3e | 632 | dtls1_hm_fragment_free(frag); |
7ee8627f | 633 | return -1; |
0f113f3e | 634 | } |
934e22e8 | 635 | |
36d16f8e | 636 | static int |
7ee8627f | 637 | dtls1_process_out_of_seq_message(SSL *s, const struct hm_header_st *msg_hdr) |
36d16f8e | 638 | { |
0f113f3e MC |
639 | int i = -1; |
640 | hm_fragment *frag = NULL; | |
641 | pitem *item = NULL; | |
642 | unsigned char seq64be[8]; | |
7ee8627f | 643 | size_t frag_len = msg_hdr->frag_len; |
54105ddd | 644 | size_t readbytes; |
0f113f3e MC |
645 | |
646 | if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len) | |
647 | goto err; | |
648 | ||
649 | /* Try to find item in queue, to prevent duplicate entries */ | |
650 | memset(seq64be, 0, sizeof(seq64be)); | |
651 | seq64be[6] = (unsigned char)(msg_hdr->seq >> 8); | |
652 | seq64be[7] = (unsigned char)msg_hdr->seq; | |
653 | item = pqueue_find(s->d1->buffered_messages, seq64be); | |
654 | ||
655 | /* | |
656 | * If we already have an entry and this one is a fragment, don't discard | |
657 | * it and rather try to reassemble it. | |
658 | */ | |
659 | if (item != NULL && frag_len != msg_hdr->msg_len) | |
660 | item = NULL; | |
661 | ||
662 | /* | |
663 | * Discard the message if sequence number was already there, is too far | |
664 | * in the future, already in the queue or if we received a FINISHED | |
665 | * before the SERVER_HELLO, which then must be a stale retransmit. | |
666 | */ | |
667 | if (msg_hdr->seq <= s->d1->handshake_read_seq || | |
668 | msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL || | |
a230b26e | 669 | (s->d1->handshake_read_seq == 0 && msg_hdr->type == SSL3_MT_FINISHED)) { |
0f113f3e MC |
670 | unsigned char devnull[256]; |
671 | ||
672 | while (frag_len) { | |
657da85e | 673 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL, |
0f113f3e MC |
674 | devnull, |
675 | frag_len > | |
676 | sizeof(devnull) ? sizeof(devnull) : | |
54105ddd | 677 | frag_len, 0, &readbytes); |
0f113f3e MC |
678 | if (i <= 0) |
679 | goto err; | |
54105ddd | 680 | frag_len -= readbytes; |
0f113f3e MC |
681 | } |
682 | } else { | |
7ee8627f | 683 | if (frag_len != msg_hdr->msg_len) { |
0fe2a0af | 684 | return dtls1_reassemble_fragment(s, msg_hdr); |
7ee8627f | 685 | } |
0f113f3e MC |
686 | |
687 | if (frag_len > dtls1_max_handshake_message_len(s)) | |
688 | goto err; | |
689 | ||
690 | frag = dtls1_hm_fragment_new(frag_len, 0); | |
691 | if (frag == NULL) | |
692 | goto err; | |
693 | ||
694 | memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr)); | |
695 | ||
696 | if (frag_len) { | |
697 | /* | |
698 | * read the body of the fragment (header has already been read | |
699 | */ | |
657da85e | 700 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL, |
54105ddd MC |
701 | frag->fragment, frag_len, 0, |
702 | &readbytes); | |
703 | if (i<=0 || readbytes != frag_len) | |
0f113f3e MC |
704 | i = -1; |
705 | if (i <= 0) | |
706 | goto err; | |
707 | } | |
708 | ||
709 | item = pitem_new(seq64be, frag); | |
710 | if (item == NULL) | |
711 | goto err; | |
712 | ||
713 | item = pqueue_insert(s->d1->buffered_messages, item); | |
714 | /* | |
715 | * pqueue_insert fails iff a duplicate item is inserted. However, | |
716 | * |item| cannot be a duplicate. If it were, |pqueue_find|, above, | |
717 | * would have returned it. Then, either |frag_len| != | |
718 | * |msg_hdr->msg_len| in which case |item| is set to NULL and it will | |
719 | * have been processed with |dtls1_reassemble_fragment|, above, or | |
720 | * the record will have been discarded. | |
721 | */ | |
380a522f MC |
722 | if (!ossl_assert(item != NULL)) |
723 | goto err; | |
0f113f3e MC |
724 | } |
725 | ||
726 | return DTLS1_HM_FRAGMENT_RETRY; | |
727 | ||
728 | err: | |
25aaa98a | 729 | if (item == NULL) |
0f113f3e | 730 | dtls1_hm_fragment_free(frag); |
7ee8627f | 731 | return 0; |
0f113f3e | 732 | } |
36d16f8e | 733 | |
7ee8627f | 734 | static int dtls_get_reassembled_message(SSL *s, int *errtype, size_t *len) |
0f113f3e MC |
735 | { |
736 | unsigned char wire[DTLS1_HM_HEADER_LENGTH]; | |
7ee8627f | 737 | size_t mlen, frag_off, frag_len; |
d273b60b | 738 | int i, ret, recvd_type; |
0f113f3e | 739 | struct hm_header_st msg_hdr; |
54105ddd | 740 | size_t readbytes; |
0f113f3e | 741 | |
7ee8627f MC |
742 | *errtype = 0; |
743 | ||
0f113f3e MC |
744 | redo: |
745 | /* see if we have the required fragment already */ | |
d273b60b MC |
746 | ret = dtls1_retrieve_buffered_fragment(s, &frag_len); |
747 | if (ret < 0) { | |
748 | /* SSLfatal() already called */ | |
749 | return 0; | |
750 | } | |
751 | if (ret > 0) { | |
7ee8627f | 752 | s->init_num = frag_len; |
76af3037 | 753 | *len = frag_len; |
7ee8627f | 754 | return 1; |
0f113f3e MC |
755 | } |
756 | ||
757 | /* read handshake message header */ | |
c69f2adf | 758 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &recvd_type, wire, |
54105ddd | 759 | DTLS1_HM_HEADER_LENGTH, 0, &readbytes); |
0f113f3e MC |
760 | if (i <= 0) { /* nbio, or an error */ |
761 | s->rwstate = SSL_READING; | |
7ee8627f | 762 | *len = 0; |
76af3037 | 763 | return 0; |
0f113f3e | 764 | } |
e8aa8b6c | 765 | if (recvd_type == SSL3_RT_CHANGE_CIPHER_SPEC) { |
76af3037 | 766 | if (wire[0] != SSL3_MT_CCS) { |
d273b60b | 767 | SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, |
d273b60b | 768 | SSL_R_BAD_CHANGE_CIPHER_SPEC); |
76af3037 | 769 | goto f_err; |
c69f2adf | 770 | } |
76af3037 | 771 | |
54105ddd MC |
772 | memcpy(s->init_buf->data, wire, readbytes); |
773 | s->init_num = readbytes - 1; | |
76af3037 | 774 | s->init_msg = s->init_buf->data + 1; |
555cbb32 TS |
775 | s->s3.tmp.message_type = SSL3_MT_CHANGE_CIPHER_SPEC; |
776 | s->s3.tmp.message_size = readbytes - 1; | |
54105ddd | 777 | *len = readbytes - 1; |
76af3037 | 778 | return 1; |
c69f2adf MC |
779 | } |
780 | ||
0f113f3e | 781 | /* Handshake fails if message header is incomplete */ |
54105ddd | 782 | if (readbytes != DTLS1_HM_HEADER_LENGTH) { |
c48ffbcc | 783 | SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_UNEXPECTED_MESSAGE); |
0f113f3e MC |
784 | goto f_err; |
785 | } | |
786 | ||
787 | /* parse the message fragment header */ | |
788 | dtls1_get_message_header(wire, &msg_hdr); | |
789 | ||
76af3037 | 790 | mlen = msg_hdr.msg_len; |
91d13f1a MC |
791 | frag_off = msg_hdr.frag_off; |
792 | frag_len = msg_hdr.frag_len; | |
793 | ||
794 | /* | |
795 | * We must have at least frag_len bytes left in the record to be read. | |
796 | * Fragments must not span records. | |
797 | */ | |
798 | if (frag_len > RECORD_LAYER_get_rrec_length(&s->rlayer)) { | |
c48ffbcc | 799 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_LENGTH); |
91d13f1a MC |
800 | goto f_err; |
801 | } | |
802 | ||
0f113f3e MC |
803 | /* |
804 | * if this is a future (or stale) message it gets buffered | |
805 | * (or dropped)--no further processing at this time | |
806 | * While listening, we accept seq 1 (ClientHello with cookie) | |
807 | * although we're still expecting seq 0 (ClientHello) | |
808 | */ | |
76af3037 | 809 | if (msg_hdr.seq != s->d1->handshake_read_seq) { |
7ee8627f MC |
810 | *errtype = dtls1_process_out_of_seq_message(s, &msg_hdr); |
811 | return 0; | |
76af3037 | 812 | } |
0f113f3e | 813 | |
76af3037 | 814 | if (frag_len && frag_len < mlen) { |
7ee8627f MC |
815 | *errtype = dtls1_reassemble_fragment(s, &msg_hdr); |
816 | return 0; | |
76af3037 | 817 | } |
0f113f3e | 818 | |
1f5b44e9 MC |
819 | if (!s->server |
820 | && s->d1->r_msg_hdr.frag_off == 0 | |
c7f47786 MC |
821 | && s->statem.hand_state != TLS_ST_OK |
822 | && wire[0] == SSL3_MT_HELLO_REQUEST) { | |
0f113f3e MC |
823 | /* |
824 | * The server may always send 'Hello Request' messages -- we are | |
825 | * doing a handshake anyway now, so ignore them if their format is | |
826 | * correct. Does not count for 'Finished' MAC. | |
827 | */ | |
828 | if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) { | |
829 | if (s->msg_callback) | |
830 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, | |
831 | wire, DTLS1_HM_HEADER_LENGTH, s, | |
832 | s->msg_callback_arg); | |
833 | ||
834 | s->init_num = 0; | |
835 | goto redo; | |
60250017 | 836 | } else { /* Incorrectly formatted Hello request */ |
0f113f3e | 837 | |
c48ffbcc | 838 | SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_UNEXPECTED_MESSAGE); |
0f113f3e MC |
839 | goto f_err; |
840 | } | |
841 | } | |
842 | ||
d273b60b MC |
843 | if (!dtls1_preprocess_fragment(s, &msg_hdr)) { |
844 | /* SSLfatal() already called */ | |
0f113f3e | 845 | goto f_err; |
d273b60b | 846 | } |
0f113f3e | 847 | |
0f113f3e MC |
848 | if (frag_len > 0) { |
849 | unsigned char *p = | |
850 | (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH; | |
851 | ||
657da85e | 852 | i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL, |
54105ddd | 853 | &p[frag_off], frag_len, 0, &readbytes); |
91d13f1a | 854 | |
0f113f3e | 855 | /* |
91d13f1a MC |
856 | * This shouldn't ever fail due to NBIO because we already checked |
857 | * that we have enough data in the record | |
0f113f3e MC |
858 | */ |
859 | if (i <= 0) { | |
860 | s->rwstate = SSL_READING; | |
7ee8627f | 861 | *len = 0; |
76af3037 | 862 | return 0; |
0f113f3e | 863 | } |
7ee8627f | 864 | } else { |
54105ddd | 865 | readbytes = 0; |
7ee8627f | 866 | } |
0f113f3e MC |
867 | |
868 | /* | |
869 | * XDTLS: an incorrectly formatted fragment should cause the handshake | |
870 | * to fail | |
871 | */ | |
54105ddd | 872 | if (readbytes != frag_len) { |
c48ffbcc | 873 | SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_LENGTH); |
0f113f3e MC |
874 | goto f_err; |
875 | } | |
876 | ||
0f113f3e MC |
877 | /* |
878 | * Note that s->init_num is *not* used as current offset in | |
879 | * s->init_buf->data, but as a counter summing up fragments' lengths: as | |
880 | * soon as they sum up to handshake packet length, we assume we have got | |
881 | * all the fragments. | |
882 | */ | |
76af3037 MC |
883 | *len = s->init_num = frag_len; |
884 | return 1; | |
0f113f3e MC |
885 | |
886 | f_err: | |
0f113f3e | 887 | s->init_num = 0; |
7ee8627f | 888 | *len = 0; |
76af3037 | 889 | return 0; |
0f113f3e | 890 | } |
36d16f8e | 891 | |
1d97c843 TH |
892 | /*- |
893 | * for these 2 messages, we need to | |
0f113f3e | 894 | * ssl->enc_read_ctx re-init |
de07f311 | 895 | * ssl->rlayer.read_sequence zero |
555cbb32 | 896 | * ssl->s3.read_mac_secret re-init |
0f113f3e MC |
897 | * ssl->session->read_sym_enc assign |
898 | * ssl->session->read_compression assign | |
899 | * ssl->session->read_hash assign | |
36d16f8e | 900 | */ |
7cea05dc | 901 | int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt) |
0f113f3e | 902 | { |
473483d4 MC |
903 | if (s->version == DTLS1_BAD_VER) { |
904 | s->d1->next_handshake_write_seq++; | |
85a7a5e6 | 905 | |
7cea05dc | 906 | if (!WPACKET_put_bytes_u16(pkt, s->d1->handshake_write_seq)) { |
c48ffbcc | 907 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
d273b60b | 908 | return 0; |
85a7a5e6 | 909 | } |
0f113f3e | 910 | } |
36d16f8e | 911 | |
473483d4 MC |
912 | return 1; |
913 | } | |
914 | ||
915 | #ifndef OPENSSL_NO_SCTP | |
2e92af5e MC |
916 | /* |
917 | * Wait for a dry event. Should only be called at a point in the handshake | |
918 | * where we are not expecting any data from the peer except an alert. | |
919 | */ | |
be3583fa | 920 | WORK_STATE dtls_wait_for_dry(SSL *s) |
473483d4 | 921 | { |
2e92af5e MC |
922 | int ret, errtype; |
923 | size_t len; | |
473483d4 MC |
924 | |
925 | /* read app data until dry event */ | |
926 | ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); | |
a2c2e000 | 927 | if (ret < 0) { |
c48ffbcc | 928 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
473483d4 | 929 | return WORK_ERROR; |
a2c2e000 | 930 | } |
473483d4 MC |
931 | |
932 | if (ret == 0) { | |
2e92af5e MC |
933 | /* |
934 | * We're not expecting any more messages from the peer at this point - | |
935 | * but we could get an alert. If an alert is waiting then we will never | |
936 | * return successfully. Therefore we attempt to read a message. This | |
937 | * should never succeed but will process any waiting alerts. | |
938 | */ | |
939 | if (dtls_get_reassembled_message(s, &errtype, &len)) { | |
940 | /* The call succeeded! This should never happen */ | |
c48ffbcc | 941 | SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_UNEXPECTED_MESSAGE); |
2e92af5e MC |
942 | return WORK_ERROR; |
943 | } | |
944 | ||
555cbb32 | 945 | s->s3.in_read_app_data = 2; |
473483d4 MC |
946 | s->rwstate = SSL_READING; |
947 | BIO_clear_retry_flags(SSL_get_rbio(s)); | |
948 | BIO_set_retry_read(SSL_get_rbio(s)); | |
949 | return WORK_MORE_A; | |
950 | } | |
951 | return WORK_FINISHED_CONTINUE; | |
0f113f3e | 952 | } |
473483d4 | 953 | #endif |
36d16f8e | 954 | |
36d16f8e | 955 | int dtls1_read_failed(SSL *s, int code) |
0f113f3e MC |
956 | { |
957 | if (code > 0) { | |
c48ffbcc | 958 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
d273b60b | 959 | return 0; |
0f113f3e MC |
960 | } |
961 | ||
c2853382 | 962 | if (!dtls1_is_timer_expired(s) || ossl_statem_in_error(s)) { |
0f113f3e MC |
963 | /* |
964 | * not a timeout, none of our business, let higher layers handle | |
965 | * this. in fact it's probably an error | |
966 | */ | |
967 | return code; | |
968 | } | |
0f113f3e MC |
969 | /* done, no need to send a retransmit */ |
970 | if (!SSL_in_init(s)) | |
0f113f3e MC |
971 | { |
972 | BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ); | |
973 | return code; | |
974 | } | |
36d16f8e | 975 | |
0f113f3e MC |
976 | return dtls1_handle_timeout(s); |
977 | } | |
36d16f8e | 978 | |
0f113f3e MC |
979 | int dtls1_get_queue_priority(unsigned short seq, int is_ccs) |
980 | { | |
981 | /* | |
982 | * The index of the retransmission queue actually is the message sequence | |
983 | * number, since the queue only contains messages of a single handshake. | |
984 | * However, the ChangeCipherSpec has no message sequence number and so | |
985 | * using only the sequence will result in the CCS and Finished having the | |
986 | * same index. To prevent this, the sequence number is multiplied by 2. | |
987 | * In case of a CCS 1 is subtracted. This does not only differ CSS and | |
988 | * Finished, it also maintains the order of the index (important for | |
989 | * priority queues) and fits in the unsigned short variable. | |
990 | */ | |
991 | return seq * 2 - is_ccs; | |
992 | } | |
36d16f8e | 993 | |
0f113f3e MC |
994 | int dtls1_retransmit_buffered_messages(SSL *s) |
995 | { | |
cf2cede4 | 996 | pqueue *sent = s->d1->sent_messages; |
0f113f3e MC |
997 | piterator iter; |
998 | pitem *item; | |
999 | hm_fragment *frag; | |
1000 | int found = 0; | |
1001 | ||
1002 | iter = pqueue_iterator(sent); | |
1003 | ||
1004 | for (item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter)) { | |
1005 | frag = (hm_fragment *)item->data; | |
1006 | if (dtls1_retransmit_message(s, (unsigned short) | |
1007 | dtls1_get_queue_priority | |
1008 | (frag->msg_header.seq, | |
a230b26e | 1009 | frag->msg_header.is_ccs), &found) <= 0) |
0f113f3e | 1010 | return -1; |
0f113f3e MC |
1011 | } |
1012 | ||
1013 | return 1; | |
1014 | } | |
36d16f8e | 1015 | |
0f113f3e MC |
1016 | int dtls1_buffer_message(SSL *s, int is_ccs) |
1017 | { | |
1018 | pitem *item; | |
1019 | hm_fragment *frag; | |
1020 | unsigned char seq64be[8]; | |
1021 | ||
1022 | /* | |
1023 | * this function is called immediately after a message has been | |
1024 | * serialized | |
1025 | */ | |
380a522f MC |
1026 | if (!ossl_assert(s->init_off == 0)) |
1027 | return 0; | |
0f113f3e MC |
1028 | |
1029 | frag = dtls1_hm_fragment_new(s->init_num, 0); | |
a71edf3b | 1030 | if (frag == NULL) |
0f113f3e MC |
1031 | return 0; |
1032 | ||
1033 | memcpy(frag->fragment, s->init_buf->data, s->init_num); | |
1034 | ||
1035 | if (is_ccs) { | |
5178a16c | 1036 | /* For DTLS1_BAD_VER the header length is non-standard */ |
380a522f MC |
1037 | if (!ossl_assert(s->d1->w_msg_hdr.msg_len + |
1038 | ((s->version == | |
1039 | DTLS1_BAD_VER) ? 3 : DTLS1_CCS_HEADER_LENGTH) | |
48ff651e P |
1040 | == (unsigned int)s->init_num)) { |
1041 | dtls1_hm_fragment_free(frag); | |
380a522f | 1042 | return 0; |
48ff651e | 1043 | } |
0f113f3e | 1044 | } else { |
380a522f | 1045 | if (!ossl_assert(s->d1->w_msg_hdr.msg_len + |
48ff651e P |
1046 | DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num)) { |
1047 | dtls1_hm_fragment_free(frag); | |
380a522f | 1048 | return 0; |
48ff651e | 1049 | } |
0f113f3e MC |
1050 | } |
1051 | ||
1052 | frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len; | |
1053 | frag->msg_header.seq = s->d1->w_msg_hdr.seq; | |
1054 | frag->msg_header.type = s->d1->w_msg_hdr.type; | |
1055 | frag->msg_header.frag_off = 0; | |
1056 | frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len; | |
1057 | frag->msg_header.is_ccs = is_ccs; | |
1058 | ||
1059 | /* save current state */ | |
1060 | frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx; | |
1061 | frag->msg_header.saved_retransmit_state.write_hash = s->write_hash; | |
1062 | frag->msg_header.saved_retransmit_state.compress = s->compress; | |
1063 | frag->msg_header.saved_retransmit_state.session = s->session; | |
78a39fe7 MC |
1064 | frag->msg_header.saved_retransmit_state.epoch = |
1065 | DTLS_RECORD_LAYER_get_w_epoch(&s->rlayer); | |
0f113f3e MC |
1066 | |
1067 | memset(seq64be, 0, sizeof(seq64be)); | |
1068 | seq64be[6] = | |
1069 | (unsigned | |
1070 | char)(dtls1_get_queue_priority(frag->msg_header.seq, | |
1071 | frag->msg_header.is_ccs) >> 8); | |
1072 | seq64be[7] = | |
1073 | (unsigned | |
1074 | char)(dtls1_get_queue_priority(frag->msg_header.seq, | |
1075 | frag->msg_header.is_ccs)); | |
1076 | ||
1077 | item = pitem_new(seq64be, frag); | |
1078 | if (item == NULL) { | |
1079 | dtls1_hm_fragment_free(frag); | |
1080 | return 0; | |
1081 | } | |
36d16f8e | 1082 | |
0f113f3e MC |
1083 | pqueue_insert(s->d1->sent_messages, item); |
1084 | return 1; | |
1085 | } | |
36d16f8e | 1086 | |
a230b26e | 1087 | int dtls1_retransmit_message(SSL *s, unsigned short seq, int *found) |
0f113f3e MC |
1088 | { |
1089 | int ret; | |
1090 | /* XDTLS: for now assuming that read/writes are blocking */ | |
1091 | pitem *item; | |
1092 | hm_fragment *frag; | |
1093 | unsigned long header_length; | |
1094 | unsigned char seq64be[8]; | |
1095 | struct dtls1_retransmit_state saved_state; | |
0f113f3e | 1096 | |
0f113f3e MC |
1097 | /* XDTLS: the requested message ought to be found, otherwise error */ |
1098 | memset(seq64be, 0, sizeof(seq64be)); | |
1099 | seq64be[6] = (unsigned char)(seq >> 8); | |
1100 | seq64be[7] = (unsigned char)seq; | |
1101 | ||
1102 | item = pqueue_find(s->d1->sent_messages, seq64be); | |
1103 | if (item == NULL) { | |
c48ffbcc | 1104 | SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR); |
0f113f3e MC |
1105 | *found = 0; |
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | *found = 1; | |
1110 | frag = (hm_fragment *)item->data; | |
1111 | ||
1112 | if (frag->msg_header.is_ccs) | |
1113 | header_length = DTLS1_CCS_HEADER_LENGTH; | |
1114 | else | |
1115 | header_length = DTLS1_HM_HEADER_LENGTH; | |
1116 | ||
1117 | memcpy(s->init_buf->data, frag->fragment, | |
1118 | frag->msg_header.msg_len + header_length); | |
1119 | s->init_num = frag->msg_header.msg_len + header_length; | |
1120 | ||
1121 | dtls1_set_message_header_int(s, frag->msg_header.type, | |
1122 | frag->msg_header.msg_len, | |
1123 | frag->msg_header.seq, 0, | |
1124 | frag->msg_header.frag_len); | |
1125 | ||
1126 | /* save current state */ | |
1127 | saved_state.enc_write_ctx = s->enc_write_ctx; | |
1128 | saved_state.write_hash = s->write_hash; | |
1129 | saved_state.compress = s->compress; | |
1130 | saved_state.session = s->session; | |
78a39fe7 | 1131 | saved_state.epoch = DTLS_RECORD_LAYER_get_w_epoch(&s->rlayer); |
0f113f3e MC |
1132 | |
1133 | s->d1->retransmitting = 1; | |
1134 | ||
1135 | /* restore state in which the message was originally sent */ | |
1136 | s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx; | |
1137 | s->write_hash = frag->msg_header.saved_retransmit_state.write_hash; | |
1138 | s->compress = frag->msg_header.saved_retransmit_state.compress; | |
1139 | s->session = frag->msg_header.saved_retransmit_state.session; | |
3bb8f87d | 1140 | DTLS_RECORD_LAYER_set_saved_w_epoch(&s->rlayer, |
a230b26e EK |
1141 | frag->msg_header. |
1142 | saved_retransmit_state.epoch); | |
0f113f3e | 1143 | |
0f113f3e MC |
1144 | ret = dtls1_do_write(s, frag->msg_header.is_ccs ? |
1145 | SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE); | |
1146 | ||
1147 | /* restore current state */ | |
1148 | s->enc_write_ctx = saved_state.enc_write_ctx; | |
1149 | s->write_hash = saved_state.write_hash; | |
1150 | s->compress = saved_state.compress; | |
1151 | s->session = saved_state.session; | |
3bb8f87d | 1152 | DTLS_RECORD_LAYER_set_saved_w_epoch(&s->rlayer, saved_state.epoch); |
0f113f3e MC |
1153 | |
1154 | s->d1->retransmitting = 0; | |
1155 | ||
2e7dc7cd | 1156 | (void)BIO_flush(s->wbio); |
0f113f3e MC |
1157 | return ret; |
1158 | } | |
36d16f8e | 1159 | |
a773b52a | 1160 | void dtls1_set_message_header(SSL *s, |
d736bc1a MC |
1161 | unsigned char mt, size_t len, |
1162 | size_t frag_off, size_t frag_len) | |
0f113f3e | 1163 | { |
912c89c5 | 1164 | if (frag_off == 0) { |
0f113f3e MC |
1165 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; |
1166 | s->d1->next_handshake_write_seq++; | |
1167 | } | |
54ef01b5 | 1168 | |
0f113f3e MC |
1169 | dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq, |
1170 | frag_off, frag_len); | |
0f113f3e | 1171 | } |
36d16f8e BL |
1172 | |
1173 | /* don't actually do the writing, wait till the MTU has been retrieved */ | |
1174 | static void | |
1175 | dtls1_set_message_header_int(SSL *s, unsigned char mt, | |
7ee8627f MC |
1176 | size_t len, unsigned short seq_num, |
1177 | size_t frag_off, size_t frag_len) | |
0f113f3e MC |
1178 | { |
1179 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
1180 | ||
1181 | msg_hdr->type = mt; | |
1182 | msg_hdr->msg_len = len; | |
1183 | msg_hdr->seq = seq_num; | |
1184 | msg_hdr->frag_off = frag_off; | |
1185 | msg_hdr->frag_len = frag_len; | |
1186 | } | |
36d16f8e BL |
1187 | |
1188 | static void | |
7ee8627f | 1189 | dtls1_fix_message_header(SSL *s, size_t frag_off, size_t frag_len) |
0f113f3e MC |
1190 | { |
1191 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
36d16f8e | 1192 | |
0f113f3e MC |
1193 | msg_hdr->frag_off = frag_off; |
1194 | msg_hdr->frag_len = frag_len; | |
1195 | } | |
54ef01b5 | 1196 | |
0f113f3e MC |
1197 | static unsigned char *dtls1_write_message_header(SSL *s, unsigned char *p) |
1198 | { | |
1199 | struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr; | |
54ef01b5 | 1200 | |
0f113f3e MC |
1201 | *p++ = msg_hdr->type; |
1202 | l2n3(msg_hdr->msg_len, p); | |
54ef01b5 | 1203 | |
0f113f3e MC |
1204 | s2n(msg_hdr->seq, p); |
1205 | l2n3(msg_hdr->frag_off, p); | |
1206 | l2n3(msg_hdr->frag_len, p); | |
36d16f8e | 1207 | |
0f113f3e MC |
1208 | return p; |
1209 | } | |
36d16f8e | 1210 | |
a230b26e | 1211 | void dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr) |
0f113f3e | 1212 | { |
16f8d4eb | 1213 | memset(msg_hdr, 0, sizeof(*msg_hdr)); |
0f113f3e MC |
1214 | msg_hdr->type = *(data++); |
1215 | n2l3(data, msg_hdr->msg_len); | |
54ef01b5 | 1216 | |
0f113f3e MC |
1217 | n2s(data, msg_hdr->seq); |
1218 | n2l3(data, msg_hdr->frag_off); | |
1219 | n2l3(data, msg_hdr->frag_len); | |
1220 | } | |
2c7b4dbc | 1221 | |
a29fa98c | 1222 | int dtls1_set_handshake_header(SSL *s, WPACKET *pkt, int htype) |
2c7b4dbc MC |
1223 | { |
1224 | unsigned char *header; | |
de451856 | 1225 | |
4a01c59f MC |
1226 | if (htype == SSL3_MT_CHANGE_CIPHER_SPEC) { |
1227 | s->d1->handshake_write_seq = s->d1->next_handshake_write_seq; | |
1228 | dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, | |
1229 | s->d1->handshake_write_seq, 0, 0); | |
1230 | if (!WPACKET_put_bytes_u8(pkt, SSL3_MT_CCS)) | |
1231 | return 0; | |
1232 | } else { | |
1233 | dtls1_set_message_header(s, htype, 0, 0, 0); | |
1234 | /* | |
1235 | * We allocate space at the start for the message header. This gets | |
1236 | * filled in later | |
1237 | */ | |
1238 | if (!WPACKET_allocate_bytes(pkt, DTLS1_HM_HEADER_LENGTH, &header) | |
1239 | || !WPACKET_start_sub_packet(pkt)) | |
1240 | return 0; | |
1241 | } | |
2c7b4dbc MC |
1242 | |
1243 | return 1; | |
1244 | } | |
1245 | ||
4a01c59f | 1246 | int dtls1_close_construct_packet(SSL *s, WPACKET *pkt, int htype) |
2c7b4dbc MC |
1247 | { |
1248 | size_t msglen; | |
1249 | ||
4a01c59f | 1250 | if ((htype != SSL3_MT_CHANGE_CIPHER_SPEC && !WPACKET_close(pkt)) |
f1ec23c0 | 1251 | || !WPACKET_get_length(pkt, &msglen) |
7cea05dc | 1252 | || msglen > INT_MAX) |
2c7b4dbc | 1253 | return 0; |
4a01c59f MC |
1254 | |
1255 | if (htype != SSL3_MT_CHANGE_CIPHER_SPEC) { | |
1256 | s->d1->w_msg_hdr.msg_len = msglen - DTLS1_HM_HEADER_LENGTH; | |
1257 | s->d1->w_msg_hdr.frag_len = msglen - DTLS1_HM_HEADER_LENGTH; | |
1258 | } | |
2c7b4dbc MC |
1259 | s->init_num = (int)msglen; |
1260 | s->init_off = 0; | |
1261 | ||
4a01c59f MC |
1262 | if (htype != DTLS1_MT_HELLO_VERIFY_REQUEST) { |
1263 | /* Buffer the message to handle re-xmits */ | |
1264 | if (!dtls1_buffer_message(s, htype == SSL3_MT_CHANGE_CIPHER_SPEC | |
1265 | ? 1 : 0)) | |
1266 | return 0; | |
1267 | } | |
2c7b4dbc MC |
1268 | |
1269 | return 1; | |
1270 | } |