Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* ssl/d1_pkt.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 |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * |
| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer in |
| 18 | * the documentation and/or other materials provided with the |
| 19 | * distribution. |
| 20 | * |
| 21 | * 3. All advertising materials mentioning features or use of this |
| 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/)" |
| 25 | * |
| 26 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 27 | * endorse or promote products derived from this software without |
| 28 | * prior written permission. For written permission, please contact |
| 29 | * openssl-core@openssl.org. |
| 30 | * |
| 31 | * 5. Products derived from this software may not be called "OpenSSL" |
| 32 | * nor may "OpenSSL" appear in their names without prior written |
| 33 | * permission of the OpenSSL Project. |
| 34 | * |
| 35 | * 6. Redistributions of any form whatsoever must retain the following |
| 36 | * acknowledgment: |
| 37 | * "This product includes software developed by the OpenSSL Project |
| 38 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
| 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 |
| 84 | * notice, this list of conditions and the following disclaimer. |
| 85 | * 2. Redistributions in binary form must reproduce the above copyright |
| 86 | * notice, this list of conditions and the following disclaimer in the |
| 87 | * documentation and/or other materials provided with the distribution. |
| 88 | * 3. All advertising materials mentioning features or use of this software |
| 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 :-). |
| 94 | * 4. If you include any Windows specific code (or a derivative thereof) from |
| 95 | * the apps directory (application code) you must include an acknowledgement: |
| 96 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| 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 <stdio.h> |
| 117 | #include <errno.h> |
| 118 | #define USE_SOCKETS |
| 119 | #include "ssl_locl.h" |
| 120 | #include <openssl/evp.h> |
| 121 | #include <openssl/buffer.h> |
| 122 | #include <openssl/pqueue.h> |
| 123 | #include <openssl/rand.h> |
| 124 | |
| 125 | /* mod 128 saturating subtract of two 64-bit values in big-endian order */ |
| 126 | static int satsub64be(const unsigned char *v1,const unsigned char *v2) |
| 127 | { int ret,sat,brw,i; |
| 128 | |
| 129 | if (sizeof(long) == 8) do |
| 130 | { const union { long one; char little; } is_endian = {1}; |
| 131 | long l; |
| 132 | |
| 133 | if (is_endian.little) break; |
| 134 | /* not reached on little-endians */ |
| 135 | /* following test is redundant, because input is |
| 136 | * always aligned, but I take no chances... */ |
| 137 | if (((size_t)v1|(size_t)v2)&0x7) break; |
| 138 | |
| 139 | l = *((long *)v1); |
| 140 | l -= *((long *)v2); |
| 141 | if (l>128) return 128; |
| 142 | else if (l<-128) return -128; |
| 143 | else return (int)l; |
| 144 | } while (0); |
| 145 | |
| 146 | ret = (int)v1[7]-(int)v2[7]; |
| 147 | sat = 0; |
| 148 | brw = ret>>8; /* brw is either 0 or -1 */ |
| 149 | if (ret & 0x80) |
| 150 | { for (i=6;i>=0;i--) |
| 151 | { brw += (int)v1[i]-(int)v2[i]; |
| 152 | sat |= ~brw; |
| 153 | brw >>= 8; |
| 154 | } |
| 155 | } |
| 156 | else |
| 157 | { for (i=6;i>=0;i--) |
| 158 | { brw += (int)v1[i]-(int)v2[i]; |
| 159 | sat |= brw; |
| 160 | brw >>= 8; |
| 161 | } |
| 162 | } |
| 163 | brw <<= 8; /* brw is either 0 or -256 */ |
| 164 | |
| 165 | if (sat&0xff) return brw | 0x80; |
| 166 | else return brw + (ret&0xFF); |
| 167 | } |
| 168 | |
| 169 | static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
| 170 | int len, int peek); |
| 171 | static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap); |
| 172 | static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap); |
| 173 | static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, |
| 174 | unsigned int *is_next_epoch); |
| 175 | #if 0 |
| 176 | static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, |
| 177 | unsigned short *priority, unsigned long *offset); |
| 178 | #endif |
| 179 | static int dtls1_buffer_record(SSL *s, record_pqueue *q, |
| 180 | unsigned char *priority); |
| 181 | static int dtls1_process_record(SSL *s); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 182 | static void dtls1_clear_timeouts(SSL *s); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 183 | |
| 184 | /* copy buffered record into SSL structure */ |
| 185 | static int |
| 186 | dtls1_copy_record(SSL *s, pitem *item) |
| 187 | { |
| 188 | DTLS1_RECORD_DATA *rdata; |
| 189 | |
| 190 | rdata = (DTLS1_RECORD_DATA *)item->data; |
| 191 | |
| 192 | if (s->s3->rbuf.buf != NULL) |
| 193 | OPENSSL_free(s->s3->rbuf.buf); |
| 194 | |
| 195 | s->packet = rdata->packet; |
| 196 | s->packet_length = rdata->packet_length; |
| 197 | memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER)); |
| 198 | memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD)); |
| 199 | |
| 200 | /* Set proper sequence number for mac calculation */ |
| 201 | memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6); |
| 202 | |
| 203 | return(1); |
| 204 | } |
| 205 | |
| 206 | |
| 207 | static int |
| 208 | dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority) |
| 209 | { |
| 210 | DTLS1_RECORD_DATA *rdata; |
| 211 | pitem *item; |
| 212 | |
| 213 | /* Limit the size of the queue to prevent DOS attacks */ |
| 214 | if (pqueue_size(queue->q) >= 100) |
| 215 | return 0; |
| 216 | |
| 217 | rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA)); |
| 218 | item = pitem_new(priority, rdata); |
| 219 | if (rdata == NULL || item == NULL) |
| 220 | { |
| 221 | if (rdata != NULL) OPENSSL_free(rdata); |
| 222 | if (item != NULL) pitem_free(item); |
| 223 | |
| 224 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); |
| 225 | return(0); |
| 226 | } |
| 227 | |
| 228 | rdata->packet = s->packet; |
| 229 | rdata->packet_length = s->packet_length; |
| 230 | memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER)); |
| 231 | memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD)); |
| 232 | |
| 233 | item->data = rdata; |
| 234 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 235 | /* insert should not fail, since duplicates are dropped */ |
| 236 | if (pqueue_insert(queue->q, item) == NULL) |
| 237 | { |
| 238 | OPENSSL_free(rdata); |
| 239 | pitem_free(item); |
| 240 | return(0); |
| 241 | } |
| 242 | |
| 243 | s->packet = NULL; |
| 244 | s->packet_length = 0; |
| 245 | memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER)); |
| 246 | memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD)); |
| 247 | |
| 248 | if (!ssl3_setup_buffers(s)) |
| 249 | { |
| 250 | SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); |
| 251 | OPENSSL_free(rdata); |
| 252 | pitem_free(item); |
| 253 | return(0); |
| 254 | } |
| 255 | |
| 256 | return(1); |
| 257 | } |
| 258 | |
| 259 | |
| 260 | static int |
| 261 | dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue) |
| 262 | { |
| 263 | pitem *item; |
| 264 | |
| 265 | item = pqueue_pop(queue->q); |
| 266 | if (item) |
| 267 | { |
| 268 | dtls1_copy_record(s, item); |
| 269 | |
| 270 | OPENSSL_free(item->data); |
| 271 | pitem_free(item); |
| 272 | |
| 273 | return(1); |
| 274 | } |
| 275 | |
| 276 | return(0); |
| 277 | } |
| 278 | |
| 279 | |
| 280 | /* retrieve a buffered record that belongs to the new epoch, i.e., not processed |
| 281 | * yet */ |
| 282 | #define dtls1_get_unprocessed_record(s) \ |
| 283 | dtls1_retrieve_buffered_record((s), \ |
| 284 | &((s)->d1->unprocessed_rcds)) |
| 285 | |
| 286 | /* retrieve a buffered record that belongs to the current epoch, ie, processed */ |
| 287 | #define dtls1_get_processed_record(s) \ |
| 288 | dtls1_retrieve_buffered_record((s), \ |
| 289 | &((s)->d1->processed_rcds)) |
| 290 | |
| 291 | static int |
| 292 | dtls1_process_buffered_records(SSL *s) |
| 293 | { |
| 294 | pitem *item; |
| 295 | |
| 296 | item = pqueue_peek(s->d1->unprocessed_rcds.q); |
| 297 | if (item) |
| 298 | { |
| 299 | /* Check if epoch is current. */ |
| 300 | if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch) |
| 301 | return(1); /* Nothing to do. */ |
| 302 | |
| 303 | /* Process all the records. */ |
| 304 | while (pqueue_peek(s->d1->unprocessed_rcds.q)) |
| 305 | { |
| 306 | dtls1_get_unprocessed_record(s); |
| 307 | if ( ! dtls1_process_record(s)) |
| 308 | return(0); |
| 309 | dtls1_buffer_record(s, &(s->d1->processed_rcds), |
| 310 | s->s3->rrec.seq_num); |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | /* sync epoch numbers once all the unprocessed records |
| 315 | * have been processed */ |
| 316 | s->d1->processed_rcds.epoch = s->d1->r_epoch; |
| 317 | s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1; |
| 318 | |
| 319 | return(1); |
| 320 | } |
| 321 | |
| 322 | |
| 323 | #if 0 |
| 324 | |
| 325 | static int |
| 326 | dtls1_get_buffered_record(SSL *s) |
| 327 | { |
| 328 | pitem *item; |
| 329 | PQ_64BIT priority = |
| 330 | (((PQ_64BIT)s->d1->handshake_read_seq) << 32) | |
| 331 | ((PQ_64BIT)s->d1->r_msg_hdr.frag_off); |
| 332 | |
| 333 | if ( ! SSL_in_init(s)) /* if we're not (re)negotiating, |
| 334 | nothing buffered */ |
| 335 | return 0; |
| 336 | |
| 337 | |
| 338 | item = pqueue_peek(s->d1->rcvd_records); |
| 339 | if (item && item->priority == priority) |
| 340 | { |
| 341 | /* Check if we've received the record of interest. It must be |
| 342 | * a handshake record, since data records as passed up without |
| 343 | * buffering */ |
| 344 | DTLS1_RECORD_DATA *rdata; |
| 345 | item = pqueue_pop(s->d1->rcvd_records); |
| 346 | rdata = (DTLS1_RECORD_DATA *)item->data; |
| 347 | |
| 348 | if (s->s3->rbuf.buf != NULL) |
| 349 | OPENSSL_free(s->s3->rbuf.buf); |
| 350 | |
| 351 | s->packet = rdata->packet; |
| 352 | s->packet_length = rdata->packet_length; |
| 353 | memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER)); |
| 354 | memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD)); |
| 355 | |
| 356 | OPENSSL_free(item->data); |
| 357 | pitem_free(item); |
| 358 | |
| 359 | /* s->d1->next_expected_seq_num++; */ |
| 360 | return(1); |
| 361 | } |
| 362 | |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | #endif |
| 367 | |
| 368 | static int |
| 369 | dtls1_process_record(SSL *s) |
| 370 | { |
| 371 | int i,al; |
| 372 | int clear=0; |
| 373 | int enc_err; |
| 374 | SSL_SESSION *sess; |
| 375 | SSL3_RECORD *rr; |
| 376 | unsigned int mac_size; |
| 377 | unsigned char md[EVP_MAX_MD_SIZE]; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 378 | |
| 379 | |
| 380 | rr= &(s->s3->rrec); |
| 381 | sess = s->session; |
| 382 | |
| 383 | /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length, |
| 384 | * and we have that many bytes in s->packet |
| 385 | */ |
| 386 | rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]); |
| 387 | |
| 388 | /* ok, we can now read from 's->packet' data into 'rr' |
| 389 | * rr->input points at rr->length bytes, which |
| 390 | * need to be copied into rr->data by either |
| 391 | * the decryption or by the decompression |
| 392 | * When the data is 'copied' into the rr->data buffer, |
| 393 | * rr->input will be pointed at the new buffer */ |
| 394 | |
| 395 | /* We now have - encrypted [ MAC [ compressed [ plain ] ] ] |
| 396 | * rr->length bytes of encrypted compressed stuff. */ |
| 397 | |
| 398 | /* check is not needed I believe */ |
| 399 | if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) |
| 400 | { |
| 401 | al=SSL_AD_RECORD_OVERFLOW; |
| 402 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG); |
| 403 | goto f_err; |
| 404 | } |
| 405 | |
| 406 | /* decrypt in place in 'rr->input' */ |
| 407 | rr->data=rr->input; |
| 408 | |
| 409 | enc_err = s->method->ssl3_enc->enc(s,0); |
| 410 | if (enc_err <= 0) |
| 411 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 412 | /* decryption failed, silently discard message */ |
| 413 | if (enc_err < 0) |
| 414 | { |
| 415 | rr->length = 0; |
| 416 | s->packet_length = 0; |
| 417 | } |
| 418 | goto err; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | #ifdef TLS_DEBUG |
| 422 | printf("dec %d\n",rr->length); |
| 423 | { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); } |
| 424 | printf("\n"); |
| 425 | #endif |
| 426 | |
| 427 | /* r->length is now the compressed data plus mac */ |
| 428 | if ( (sess == NULL) || |
| 429 | (s->enc_read_ctx == NULL) || |
| 430 | (s->read_hash == NULL)) |
| 431 | clear=1; |
| 432 | |
| 433 | if (!clear) |
| 434 | { |
| 435 | /* !clear => s->read_hash != NULL => mac_size != -1 */ |
| 436 | int t; |
| 437 | t=EVP_MD_CTX_size(s->read_hash); |
| 438 | OPENSSL_assert(t >= 0); |
| 439 | mac_size=t; |
| 440 | |
| 441 | if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size) |
| 442 | { |
| 443 | #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */ |
| 444 | al=SSL_AD_RECORD_OVERFLOW; |
| 445 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG); |
| 446 | goto f_err; |
| 447 | #else |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 448 | goto err; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 449 | #endif |
| 450 | } |
| 451 | /* check the MAC for rr->input (it's in mac_size bytes at the tail) */ |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 452 | if (rr->length < mac_size) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 453 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 454 | #if 0 /* OK only for stream ciphers */ |
| 455 | al=SSL_AD_DECODE_ERROR; |
| 456 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT); |
| 457 | goto f_err; |
| 458 | #else |
| 459 | goto err; |
| 460 | #endif |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 461 | } |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 462 | rr->length-=mac_size; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 463 | i=s->method->ssl3_enc->mac(s,md,0); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 464 | if (i < 0 || memcmp(md,&(rr->data[rr->length]),mac_size) != 0) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 465 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 466 | goto err; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 467 | } |
| 468 | } |
| 469 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 470 | /* r->length is now just compressed */ |
| 471 | if (s->expand != NULL) |
| 472 | { |
| 473 | if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH) |
| 474 | { |
| 475 | al=SSL_AD_RECORD_OVERFLOW; |
| 476 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG); |
| 477 | goto f_err; |
| 478 | } |
| 479 | if (!ssl3_do_uncompress(s)) |
| 480 | { |
| 481 | al=SSL_AD_DECOMPRESSION_FAILURE; |
| 482 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION); |
| 483 | goto f_err; |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH) |
| 488 | { |
| 489 | al=SSL_AD_RECORD_OVERFLOW; |
| 490 | SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG); |
| 491 | goto f_err; |
| 492 | } |
| 493 | |
| 494 | rr->off=0; |
| 495 | /* So at this point the following is true |
| 496 | * ssl->s3->rrec.type is the type of record |
| 497 | * ssl->s3->rrec.length == number of bytes in record |
| 498 | * ssl->s3->rrec.off == offset to first valid byte |
| 499 | * ssl->s3->rrec.data == where to take bytes from, increment |
| 500 | * after use :-). |
| 501 | */ |
| 502 | |
| 503 | /* we have pulled in a full packet so zero things */ |
| 504 | s->packet_length=0; |
| 505 | dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */ |
| 506 | return(1); |
| 507 | |
| 508 | f_err: |
| 509 | ssl3_send_alert(s,SSL3_AL_FATAL,al); |
| 510 | err: |
| 511 | return(0); |
| 512 | } |
| 513 | |
| 514 | |
| 515 | /* Call this to get a new input record. |
| 516 | * It will return <= 0 if more data is needed, normally due to an error |
| 517 | * or non-blocking IO. |
| 518 | * When it finishes, one packet has been decoded and can be found in |
| 519 | * ssl->s3->rrec.type - is the type of record |
| 520 | * ssl->s3->rrec.data, - data |
| 521 | * ssl->s3->rrec.length, - number of bytes |
| 522 | */ |
| 523 | /* used only by dtls1_read_bytes */ |
| 524 | int dtls1_get_record(SSL *s) |
| 525 | { |
| 526 | int ssl_major,ssl_minor; |
| 527 | int i,n; |
| 528 | SSL3_RECORD *rr; |
| 529 | unsigned char *p = NULL; |
| 530 | unsigned short version; |
| 531 | DTLS1_BITMAP *bitmap; |
| 532 | unsigned int is_next_epoch; |
| 533 | |
| 534 | rr= &(s->s3->rrec); |
| 535 | |
| 536 | /* The epoch may have changed. If so, process all the |
| 537 | * pending records. This is a non-blocking operation. */ |
| 538 | dtls1_process_buffered_records(s); |
| 539 | |
| 540 | /* if we're renegotiating, then there may be buffered records */ |
| 541 | if (dtls1_get_processed_record(s)) |
| 542 | return 1; |
| 543 | |
| 544 | /* get something from the wire */ |
| 545 | again: |
| 546 | /* check if we have the header */ |
| 547 | if ( (s->rstate != SSL_ST_READ_BODY) || |
| 548 | (s->packet_length < DTLS1_RT_HEADER_LENGTH)) |
| 549 | { |
| 550 | n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0); |
| 551 | /* read timeout is handled by dtls1_read_bytes */ |
| 552 | if (n <= 0) return(n); /* error or non-blocking */ |
| 553 | |
| 554 | /* this packet contained a partial record, dump it */ |
| 555 | if (s->packet_length != DTLS1_RT_HEADER_LENGTH) |
| 556 | { |
| 557 | s->packet_length = 0; |
| 558 | goto again; |
| 559 | } |
| 560 | |
| 561 | s->rstate=SSL_ST_READ_BODY; |
| 562 | |
| 563 | p=s->packet; |
| 564 | |
| 565 | /* Pull apart the header into the DTLS1_RECORD */ |
| 566 | rr->type= *(p++); |
| 567 | ssl_major= *(p++); |
| 568 | ssl_minor= *(p++); |
| 569 | version=(ssl_major<<8)|ssl_minor; |
| 570 | |
| 571 | /* sequence number is 64 bits, with top 2 bytes = epoch */ |
| 572 | n2s(p,rr->epoch); |
| 573 | |
| 574 | memcpy(&(s->s3->read_sequence[2]), p, 6); |
| 575 | p+=6; |
| 576 | |
| 577 | n2s(p,rr->length); |
| 578 | |
| 579 | /* Lets check version */ |
| 580 | if (!s->first_packet) |
| 581 | { |
| 582 | if (version != s->version) |
| 583 | { |
| 584 | /* unexpected version, silently discard */ |
| 585 | rr->length = 0; |
| 586 | s->packet_length = 0; |
| 587 | goto again; |
| 588 | } |
| 589 | } |
| 590 | |
| 591 | if ((version & 0xff00) != (s->version & 0xff00)) |
| 592 | { |
| 593 | /* wrong version, silently discard record */ |
| 594 | rr->length = 0; |
| 595 | s->packet_length = 0; |
| 596 | goto again; |
| 597 | } |
| 598 | |
| 599 | if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) |
| 600 | { |
| 601 | /* record too long, silently discard it */ |
| 602 | rr->length = 0; |
| 603 | s->packet_length = 0; |
| 604 | goto again; |
| 605 | } |
| 606 | |
| 607 | /* If we receive a valid record larger than the current buffer size, |
| 608 | * allocate some memory for it. |
| 609 | */ |
| 610 | if (rr->length > s->s3->rbuf.len - DTLS1_RT_HEADER_LENGTH) |
| 611 | { |
| 612 | unsigned char *pp; |
| 613 | unsigned int newlen = rr->length + DTLS1_RT_HEADER_LENGTH; |
| 614 | if ((pp=OPENSSL_realloc(s->s3->rbuf.buf, newlen))==NULL) |
| 615 | { |
| 616 | SSLerr(SSL_F_DTLS1_GET_RECORD,ERR_R_MALLOC_FAILURE); |
| 617 | return(-1); |
| 618 | } |
| 619 | p = pp + (p - s->s3->rbuf.buf); |
| 620 | s->s3->rbuf.buf=pp; |
| 621 | s->s3->rbuf.len=newlen; |
| 622 | s->packet= &(s->s3->rbuf.buf[0]); |
| 623 | } |
| 624 | |
| 625 | /* now s->rstate == SSL_ST_READ_BODY */ |
| 626 | } |
| 627 | |
| 628 | /* s->rstate == SSL_ST_READ_BODY, get and decode the data */ |
| 629 | |
| 630 | if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH) |
| 631 | { |
| 632 | /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */ |
| 633 | i=rr->length; |
| 634 | n=ssl3_read_n(s,i,i,1); |
| 635 | if (n <= 0) return(n); /* error or non-blocking io */ |
| 636 | |
| 637 | /* this packet contained a partial record, dump it */ |
| 638 | if ( n != i) |
| 639 | { |
| 640 | rr->length = 0; |
| 641 | s->packet_length = 0; |
| 642 | goto again; |
| 643 | } |
| 644 | |
| 645 | /* now n == rr->length, |
| 646 | * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */ |
| 647 | } |
| 648 | s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */ |
| 649 | |
| 650 | /* match epochs. NULL means the packet is dropped on the floor */ |
| 651 | bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch); |
| 652 | if ( bitmap == NULL) |
| 653 | { |
| 654 | rr->length = 0; |
| 655 | s->packet_length = 0; /* dump this record */ |
| 656 | goto again; /* get another record */ |
| 657 | } |
| 658 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 659 | /* Check whether this is a repeat, or aged record. |
| 660 | * Don't check if we're listening and this message is |
| 661 | * a ClientHello. They can look as if they're replayed, |
| 662 | * since they arrive from different connections and |
| 663 | * would be dropped unnecessarily. |
| 664 | */ |
| 665 | if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE && |
| 666 | *p == SSL3_MT_CLIENT_HELLO) && |
| 667 | !dtls1_record_replay_check(s, bitmap)) |
| 668 | { |
| 669 | rr->length = 0; |
| 670 | s->packet_length=0; /* dump this record */ |
| 671 | goto again; /* get another record */ |
| 672 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 673 | |
| 674 | /* just read a 0 length packet */ |
| 675 | if (rr->length == 0) goto again; |
| 676 | |
| 677 | /* If this record is from the next epoch (either HM or ALERT), |
| 678 | * and a handshake is currently in progress, buffer it since it |
| 679 | * cannot be processed at this time. However, do not buffer |
| 680 | * anything while listening. |
| 681 | */ |
| 682 | if (is_next_epoch) |
| 683 | { |
| 684 | if ((SSL_in_init(s) || s->in_handshake) && !s->d1->listen) |
| 685 | { |
| 686 | dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num); |
| 687 | } |
| 688 | rr->length = 0; |
| 689 | s->packet_length = 0; |
| 690 | goto again; |
| 691 | } |
| 692 | |
| 693 | if (!dtls1_process_record(s)) |
| 694 | { |
| 695 | rr->length = 0; |
| 696 | s->packet_length = 0; /* dump this record */ |
| 697 | goto again; /* get another record */ |
| 698 | } |
| 699 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 700 | dtls1_clear_timeouts(s); /* done waiting */ |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 701 | return(1); |
| 702 | |
| 703 | } |
| 704 | |
| 705 | /* Return up to 'len' payload bytes received in 'type' records. |
| 706 | * 'type' is one of the following: |
| 707 | * |
| 708 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) |
| 709 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) |
| 710 | * - 0 (during a shutdown, no data has to be returned) |
| 711 | * |
| 712 | * If we don't have stored data to work from, read a SSL/TLS record first |
| 713 | * (possibly multiple records if we still don't have anything to return). |
| 714 | * |
| 715 | * This function must handle any surprises the peer may have for us, such as |
| 716 | * Alert records (e.g. close_notify), ChangeCipherSpec records (not really |
| 717 | * a surprise, but handled as if it were), or renegotiation requests. |
| 718 | * Also if record payloads contain fragments too small to process, we store |
| 719 | * them until there is enough for the respective protocol (the record protocol |
| 720 | * may use arbitrary fragmentation and even interleaving): |
| 721 | * Change cipher spec protocol |
| 722 | * just 1 byte needed, no need for keeping anything stored |
| 723 | * Alert protocol |
| 724 | * 2 bytes needed (AlertLevel, AlertDescription) |
| 725 | * Handshake protocol |
| 726 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have |
| 727 | * to detect unexpected Client Hello and Hello Request messages |
| 728 | * here, anything else is handled by higher layers |
| 729 | * Application data protocol |
| 730 | * none of our business |
| 731 | */ |
| 732 | int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) |
| 733 | { |
| 734 | int al,i,j,ret; |
| 735 | unsigned int n; |
| 736 | SSL3_RECORD *rr; |
| 737 | void (*cb)(const SSL *ssl,int type2,int val)=NULL; |
| 738 | |
| 739 | if (s->s3->rbuf.buf == NULL) /* Not initialized yet */ |
| 740 | if (!ssl3_setup_buffers(s)) |
| 741 | return(-1); |
| 742 | |
| 743 | /* XXX: check what the second '&& type' is about */ |
| 744 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && |
| 745 | (type != SSL3_RT_HANDSHAKE) && type) || |
| 746 | (peek && (type != SSL3_RT_APPLICATION_DATA))) |
| 747 | { |
| 748 | SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); |
| 749 | return -1; |
| 750 | } |
| 751 | |
| 752 | /* check whether there's a handshake message (client hello?) waiting */ |
| 753 | if ( (ret = have_handshake_fragment(s, type, buf, len, peek))) |
| 754 | return ret; |
| 755 | |
| 756 | /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */ |
| 757 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 758 | if (!s->in_handshake && SSL_in_init(s)) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 759 | { |
| 760 | /* type == SSL3_RT_APPLICATION_DATA */ |
| 761 | i=s->handshake_func(s); |
| 762 | if (i < 0) return(i); |
| 763 | if (i == 0) |
| 764 | { |
| 765 | SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); |
| 766 | return(-1); |
| 767 | } |
| 768 | } |
| 769 | |
| 770 | start: |
| 771 | s->rwstate=SSL_NOTHING; |
| 772 | |
| 773 | /* s->s3->rrec.type - is the type of record |
| 774 | * s->s3->rrec.data, - data |
| 775 | * s->s3->rrec.off, - offset into 'data' for next read |
| 776 | * s->s3->rrec.length, - number of bytes. */ |
| 777 | rr = &(s->s3->rrec); |
| 778 | |
| 779 | /* We are not handshaking and have no data yet, |
| 780 | * so process data buffered during the last handshake |
| 781 | * in advance, if any. |
| 782 | */ |
| 783 | if (s->state == SSL_ST_OK && rr->length == 0) |
| 784 | { |
| 785 | pitem *item; |
| 786 | item = pqueue_pop(s->d1->buffered_app_data.q); |
| 787 | if (item) |
| 788 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 789 | dtls1_copy_record(s, item); |
| 790 | |
| 791 | OPENSSL_free(item->data); |
| 792 | pitem_free(item); |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | /* Check for timeout */ |
| 797 | if (dtls1_handle_timeout(s) > 0) |
| 798 | goto start; |
| 799 | |
| 800 | /* get new packet if necessary */ |
| 801 | if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) |
| 802 | { |
| 803 | ret=dtls1_get_record(s); |
| 804 | if (ret <= 0) |
| 805 | { |
| 806 | ret = dtls1_read_failed(s, ret); |
| 807 | /* anything other than a timeout is an error */ |
| 808 | if (ret <= 0) |
| 809 | return(ret); |
| 810 | else |
| 811 | goto start; |
| 812 | } |
| 813 | } |
| 814 | |
| 815 | /* we now have a packet which can be read and processed */ |
| 816 | |
| 817 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, |
| 818 | * reset by ssl3_get_finished */ |
| 819 | && (rr->type != SSL3_RT_HANDSHAKE)) |
| 820 | { |
| 821 | /* We now have application data between CCS and Finished. |
| 822 | * Most likely the packets were reordered on their way, so |
| 823 | * buffer the application data for later processing rather |
| 824 | * than dropping the connection. |
| 825 | */ |
| 826 | dtls1_buffer_record(s, &(s->d1->buffered_app_data), rr->seq_num); |
| 827 | rr->length = 0; |
| 828 | goto start; |
| 829 | } |
| 830 | |
| 831 | /* If the other end has shut down, throw anything we read away |
| 832 | * (even in 'peek' mode) */ |
| 833 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) |
| 834 | { |
| 835 | rr->length=0; |
| 836 | s->rwstate=SSL_NOTHING; |
| 837 | return(0); |
| 838 | } |
| 839 | |
| 840 | |
| 841 | if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */ |
| 842 | { |
| 843 | /* make sure that we are not getting application data when we |
| 844 | * are doing a handshake for the first time */ |
| 845 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && |
| 846 | (s->enc_read_ctx == NULL)) |
| 847 | { |
| 848 | al=SSL_AD_UNEXPECTED_MESSAGE; |
| 849 | SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE); |
| 850 | goto f_err; |
| 851 | } |
| 852 | |
| 853 | if (len <= 0) return(len); |
| 854 | |
| 855 | if ((unsigned int)len > rr->length) |
| 856 | n = rr->length; |
| 857 | else |
| 858 | n = (unsigned int)len; |
| 859 | |
| 860 | memcpy(buf,&(rr->data[rr->off]),n); |
| 861 | if (!peek) |
| 862 | { |
| 863 | rr->length-=n; |
| 864 | rr->off+=n; |
| 865 | if (rr->length == 0) |
| 866 | { |
| 867 | s->rstate=SSL_ST_READ_HEADER; |
| 868 | rr->off=0; |
| 869 | } |
| 870 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 871 | return(n); |
| 872 | } |
| 873 | |
| 874 | |
| 875 | /* If we get here, then type != rr->type; if we have a handshake |
| 876 | * message, then it was unexpected (Hello Request or Client Hello). */ |
| 877 | |
| 878 | /* In case of record types for which we have 'fragment' storage, |
| 879 | * fill that so that we can process the data at a fixed place. |
| 880 | */ |
| 881 | { |
| 882 | unsigned int k, dest_maxlen = 0; |
| 883 | unsigned char *dest = NULL; |
| 884 | unsigned int *dest_len = NULL; |
| 885 | |
| 886 | if (rr->type == SSL3_RT_HANDSHAKE) |
| 887 | { |
| 888 | dest_maxlen = sizeof s->d1->handshake_fragment; |
| 889 | dest = s->d1->handshake_fragment; |
| 890 | dest_len = &s->d1->handshake_fragment_len; |
| 891 | } |
| 892 | else if (rr->type == SSL3_RT_ALERT) |
| 893 | { |
| 894 | dest_maxlen = sizeof(s->d1->alert_fragment); |
| 895 | dest = s->d1->alert_fragment; |
| 896 | dest_len = &s->d1->alert_fragment_len; |
| 897 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 898 | /* else it's a CCS message, or application data or wrong */ |
| 899 | else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC) |
| 900 | { |
| 901 | /* Application data while renegotiating |
| 902 | * is allowed. Try again reading. |
| 903 | */ |
| 904 | if (rr->type == SSL3_RT_APPLICATION_DATA) |
| 905 | { |
| 906 | BIO *bio; |
| 907 | s->s3->in_read_app_data=2; |
| 908 | bio=SSL_get_rbio(s); |
| 909 | s->rwstate=SSL_READING; |
| 910 | BIO_clear_retry_flags(bio); |
| 911 | BIO_set_retry_read(bio); |
| 912 | return(-1); |
| 913 | } |
| 914 | |
| 915 | /* Not certain if this is the right error handling */ |
| 916 | al=SSL_AD_UNEXPECTED_MESSAGE; |
| 917 | SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); |
| 918 | goto f_err; |
| 919 | } |
| 920 | |
| 921 | if (dest_maxlen > 0) |
| 922 | { |
| 923 | /* XDTLS: In a pathalogical case, the Client Hello |
| 924 | * may be fragmented--don't always expect dest_maxlen bytes */ |
| 925 | if ( rr->length < dest_maxlen) |
| 926 | { |
| 927 | #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE |
| 928 | /* |
| 929 | * for normal alerts rr->length is 2, while |
| 930 | * dest_maxlen is 7 if we were to handle this |
| 931 | * non-existing alert... |
| 932 | */ |
| 933 | FIX ME |
| 934 | #endif |
| 935 | s->rstate=SSL_ST_READ_HEADER; |
| 936 | rr->length = 0; |
| 937 | goto start; |
| 938 | } |
| 939 | |
| 940 | /* now move 'n' bytes: */ |
| 941 | for ( k = 0; k < dest_maxlen; k++) |
| 942 | { |
| 943 | dest[k] = rr->data[rr->off++]; |
| 944 | rr->length--; |
| 945 | } |
| 946 | *dest_len = dest_maxlen; |
| 947 | } |
| 948 | } |
| 949 | |
| 950 | /* s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE; |
| 951 | * s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT. |
| 952 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */ |
| 953 | |
| 954 | /* If we are a client, check for an incoming 'Hello Request': */ |
| 955 | if ((!s->server) && |
| 956 | (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
| 957 | (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && |
| 958 | (s->session != NULL) && (s->session->cipher != NULL)) |
| 959 | { |
| 960 | s->d1->handshake_fragment_len = 0; |
| 961 | |
| 962 | if ((s->d1->handshake_fragment[1] != 0) || |
| 963 | (s->d1->handshake_fragment[2] != 0) || |
| 964 | (s->d1->handshake_fragment[3] != 0)) |
| 965 | { |
| 966 | al=SSL_AD_DECODE_ERROR; |
| 967 | SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST); |
| 968 | goto err; |
| 969 | } |
| 970 | |
| 971 | /* no need to check sequence number on HELLO REQUEST messages */ |
| 972 | |
| 973 | if (s->msg_callback) |
| 974 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, |
| 975 | s->d1->handshake_fragment, 4, s, s->msg_callback_arg); |
| 976 | |
| 977 | if (SSL_is_init_finished(s) && |
| 978 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && |
| 979 | !s->s3->renegotiate) |
| 980 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 981 | ssl3_renegotiate(s); |
| 982 | if (ssl3_renegotiate_check(s)) |
| 983 | { |
| 984 | i=s->handshake_func(s); |
| 985 | if (i < 0) return(i); |
| 986 | if (i == 0) |
| 987 | { |
| 988 | SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); |
| 989 | return(-1); |
| 990 | } |
| 991 | |
| 992 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) |
| 993 | { |
| 994 | if (s->s3->rbuf.left == 0) /* no read-ahead left? */ |
| 995 | { |
| 996 | BIO *bio; |
| 997 | /* In the case where we try to read application data, |
| 998 | * but we trigger an SSL handshake, we return -1 with |
| 999 | * the retry option set. Otherwise renegotiation may |
| 1000 | * cause nasty problems in the blocking world */ |
| 1001 | s->rwstate=SSL_READING; |
| 1002 | bio=SSL_get_rbio(s); |
| 1003 | BIO_clear_retry_flags(bio); |
| 1004 | BIO_set_retry_read(bio); |
| 1005 | return(-1); |
| 1006 | } |
| 1007 | } |
| 1008 | } |
| 1009 | } |
| 1010 | /* we either finished a handshake or ignored the request, |
| 1011 | * now try again to obtain the (application) data we were asked for */ |
| 1012 | goto start; |
| 1013 | } |
| 1014 | |
| 1015 | if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) |
| 1016 | { |
| 1017 | int alert_level = s->d1->alert_fragment[0]; |
| 1018 | int alert_descr = s->d1->alert_fragment[1]; |
| 1019 | |
| 1020 | s->d1->alert_fragment_len = 0; |
| 1021 | |
| 1022 | if (s->msg_callback) |
| 1023 | s->msg_callback(0, s->version, SSL3_RT_ALERT, |
| 1024 | s->d1->alert_fragment, 2, s, s->msg_callback_arg); |
| 1025 | |
| 1026 | if (s->info_callback != NULL) |
| 1027 | cb=s->info_callback; |
| 1028 | else if (s->ctx->info_callback != NULL) |
| 1029 | cb=s->ctx->info_callback; |
| 1030 | |
| 1031 | if (cb != NULL) |
| 1032 | { |
| 1033 | j = (alert_level << 8) | alert_descr; |
| 1034 | cb(s, SSL_CB_READ_ALERT, j); |
| 1035 | } |
| 1036 | |
| 1037 | if (alert_level == 1) /* warning */ |
| 1038 | { |
| 1039 | s->s3->warn_alert = alert_descr; |
| 1040 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) |
| 1041 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1042 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; |
| 1043 | return(0); |
| 1044 | } |
| 1045 | #if 0 |
| 1046 | /* XXX: this is a possible improvement in the future */ |
| 1047 | /* now check if it's a missing record */ |
| 1048 | if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) |
| 1049 | { |
| 1050 | unsigned short seq; |
| 1051 | unsigned int frag_off; |
| 1052 | unsigned char *p = &(s->d1->alert_fragment[2]); |
| 1053 | |
| 1054 | n2s(p, seq); |
| 1055 | n2l3(p, frag_off); |
| 1056 | |
| 1057 | dtls1_retransmit_message(s, |
| 1058 | dtls1_get_queue_priority(frag->msg_header.seq, 0), |
| 1059 | frag_off, &found); |
| 1060 | if ( ! found && SSL_in_init(s)) |
| 1061 | { |
| 1062 | /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */ |
| 1063 | /* requested a message not yet sent, |
| 1064 | send an alert ourselves */ |
| 1065 | ssl3_send_alert(s,SSL3_AL_WARNING, |
| 1066 | DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); |
| 1067 | } |
| 1068 | } |
| 1069 | #endif |
| 1070 | } |
| 1071 | else if (alert_level == 2) /* fatal */ |
| 1072 | { |
| 1073 | char tmp[16]; |
| 1074 | |
| 1075 | s->rwstate=SSL_NOTHING; |
| 1076 | s->s3->fatal_alert = alert_descr; |
| 1077 | SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); |
| 1078 | BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr); |
| 1079 | ERR_add_error_data(2,"SSL alert number ",tmp); |
| 1080 | s->shutdown|=SSL_RECEIVED_SHUTDOWN; |
| 1081 | SSL_CTX_remove_session(s->ctx,s->session); |
| 1082 | return(0); |
| 1083 | } |
| 1084 | else |
| 1085 | { |
| 1086 | al=SSL_AD_ILLEGAL_PARAMETER; |
| 1087 | SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE); |
| 1088 | goto f_err; |
| 1089 | } |
| 1090 | |
| 1091 | goto start; |
| 1092 | } |
| 1093 | |
| 1094 | if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */ |
| 1095 | { |
| 1096 | s->rwstate=SSL_NOTHING; |
| 1097 | rr->length=0; |
| 1098 | return(0); |
| 1099 | } |
| 1100 | |
| 1101 | if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) |
| 1102 | { |
| 1103 | struct ccs_header_st ccs_hdr; |
| 1104 | unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH; |
| 1105 | |
| 1106 | dtls1_get_ccs_header(rr->data, &ccs_hdr); |
| 1107 | |
| 1108 | if (s->version == DTLS1_BAD_VER) |
| 1109 | ccs_hdr_len = 3; |
| 1110 | |
| 1111 | /* 'Change Cipher Spec' is just a single byte, so we know |
| 1112 | * exactly what the record payload has to look like */ |
| 1113 | /* XDTLS: check that epoch is consistent */ |
| 1114 | if ( (rr->length != ccs_hdr_len) || |
| 1115 | (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS)) |
| 1116 | { |
| 1117 | i=SSL_AD_ILLEGAL_PARAMETER; |
| 1118 | SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC); |
| 1119 | goto err; |
| 1120 | } |
| 1121 | |
| 1122 | rr->length=0; |
| 1123 | |
| 1124 | if (s->msg_callback) |
| 1125 | s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, |
| 1126 | rr->data, 1, s, s->msg_callback_arg); |
| 1127 | |
| 1128 | /* We can't process a CCS now, because previous handshake |
| 1129 | * messages are still missing, so just drop it. |
| 1130 | */ |
| 1131 | if (!s->d1->change_cipher_spec_ok) |
| 1132 | { |
| 1133 | goto start; |
| 1134 | } |
| 1135 | |
| 1136 | s->d1->change_cipher_spec_ok = 0; |
| 1137 | |
| 1138 | s->s3->change_cipher_spec=1; |
| 1139 | if (!ssl3_do_change_cipher_spec(s)) |
| 1140 | goto err; |
| 1141 | |
| 1142 | /* do this whenever CCS is processed */ |
| 1143 | dtls1_reset_seq_numbers(s, SSL3_CC_READ); |
| 1144 | |
| 1145 | if (s->version == DTLS1_BAD_VER) |
| 1146 | s->d1->handshake_read_seq++; |
| 1147 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1148 | goto start; |
| 1149 | } |
| 1150 | |
| 1151 | /* Unexpected handshake message (Client Hello, or protocol violation) */ |
| 1152 | if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && |
| 1153 | !s->in_handshake) |
| 1154 | { |
| 1155 | struct hm_header_st msg_hdr; |
| 1156 | |
| 1157 | /* this may just be a stale retransmit */ |
| 1158 | dtls1_get_message_header(rr->data, &msg_hdr); |
| 1159 | if( rr->epoch != s->d1->r_epoch) |
| 1160 | { |
| 1161 | rr->length = 0; |
| 1162 | goto start; |
| 1163 | } |
| 1164 | |
| 1165 | /* If we are server, we may have a repeated FINISHED of the |
| 1166 | * client here, then retransmit our CCS and FINISHED. |
| 1167 | */ |
| 1168 | if (msg_hdr.type == SSL3_MT_FINISHED) |
| 1169 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1170 | dtls1_retransmit_buffered_messages(s); |
| 1171 | rr->length = 0; |
| 1172 | goto start; |
| 1173 | } |
| 1174 | |
| 1175 | if (((s->state&SSL_ST_MASK) == SSL_ST_OK) && |
| 1176 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) |
| 1177 | { |
| 1178 | #if 0 /* worked only because C operator preferences are not as expected (and |
| 1179 | * because this is not really needed for clients except for detecting |
| 1180 | * protocol violations): */ |
| 1181 | s->state=SSL_ST_BEFORE|(s->server) |
| 1182 | ?SSL_ST_ACCEPT |
| 1183 | :SSL_ST_CONNECT; |
| 1184 | #else |
| 1185 | s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; |
| 1186 | #endif |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1187 | s->new_session=1; |
| 1188 | } |
| 1189 | i=s->handshake_func(s); |
| 1190 | if (i < 0) return(i); |
| 1191 | if (i == 0) |
| 1192 | { |
| 1193 | SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); |
| 1194 | return(-1); |
| 1195 | } |
| 1196 | |
| 1197 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) |
| 1198 | { |
| 1199 | if (s->s3->rbuf.left == 0) /* no read-ahead left? */ |
| 1200 | { |
| 1201 | BIO *bio; |
| 1202 | /* In the case where we try to read application data, |
| 1203 | * but we trigger an SSL handshake, we return -1 with |
| 1204 | * the retry option set. Otherwise renegotiation may |
| 1205 | * cause nasty problems in the blocking world */ |
| 1206 | s->rwstate=SSL_READING; |
| 1207 | bio=SSL_get_rbio(s); |
| 1208 | BIO_clear_retry_flags(bio); |
| 1209 | BIO_set_retry_read(bio); |
| 1210 | return(-1); |
| 1211 | } |
| 1212 | } |
| 1213 | goto start; |
| 1214 | } |
| 1215 | |
| 1216 | switch (rr->type) |
| 1217 | { |
| 1218 | default: |
| 1219 | #ifndef OPENSSL_NO_TLS |
| 1220 | /* TLS just ignores unknown message types */ |
| 1221 | if (s->version == TLS1_VERSION) |
| 1222 | { |
| 1223 | rr->length = 0; |
| 1224 | goto start; |
| 1225 | } |
| 1226 | #endif |
| 1227 | al=SSL_AD_UNEXPECTED_MESSAGE; |
| 1228 | SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); |
| 1229 | goto f_err; |
| 1230 | case SSL3_RT_CHANGE_CIPHER_SPEC: |
| 1231 | case SSL3_RT_ALERT: |
| 1232 | case SSL3_RT_HANDSHAKE: |
| 1233 | /* we already handled all of these, with the possible exception |
| 1234 | * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that |
| 1235 | * should not happen when type != rr->type */ |
| 1236 | al=SSL_AD_UNEXPECTED_MESSAGE; |
| 1237 | SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR); |
| 1238 | goto f_err; |
| 1239 | case SSL3_RT_APPLICATION_DATA: |
| 1240 | /* At this point, we were expecting handshake data, |
| 1241 | * but have application data. If the library was |
| 1242 | * running inside ssl3_read() (i.e. in_read_app_data |
| 1243 | * is set) and it makes sense to read application data |
| 1244 | * at this point (session renegotiation not yet started), |
| 1245 | * we will indulge it. |
| 1246 | */ |
| 1247 | if (s->s3->in_read_app_data && |
| 1248 | (s->s3->total_renegotiations != 0) && |
| 1249 | (( |
| 1250 | (s->state & SSL_ST_CONNECT) && |
| 1251 | (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && |
| 1252 | (s->state <= SSL3_ST_CR_SRVR_HELLO_A) |
| 1253 | ) || ( |
| 1254 | (s->state & SSL_ST_ACCEPT) && |
| 1255 | (s->state <= SSL3_ST_SW_HELLO_REQ_A) && |
| 1256 | (s->state >= SSL3_ST_SR_CLNT_HELLO_A) |
| 1257 | ) |
| 1258 | )) |
| 1259 | { |
| 1260 | s->s3->in_read_app_data=2; |
| 1261 | return(-1); |
| 1262 | } |
| 1263 | else |
| 1264 | { |
| 1265 | al=SSL_AD_UNEXPECTED_MESSAGE; |
| 1266 | SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); |
| 1267 | goto f_err; |
| 1268 | } |
| 1269 | } |
| 1270 | /* not reached */ |
| 1271 | |
| 1272 | f_err: |
| 1273 | ssl3_send_alert(s,SSL3_AL_FATAL,al); |
| 1274 | err: |
| 1275 | return(-1); |
| 1276 | } |
| 1277 | |
| 1278 | int |
| 1279 | dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len) |
| 1280 | { |
| 1281 | int i; |
| 1282 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 1283 | if (SSL_in_init(s) && !s->in_handshake) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1284 | { |
| 1285 | i=s->handshake_func(s); |
| 1286 | if (i < 0) return(i); |
| 1287 | if (i == 0) |
| 1288 | { |
| 1289 | SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); |
| 1290 | return -1; |
| 1291 | } |
| 1292 | } |
| 1293 | |
| 1294 | if (len > SSL3_RT_MAX_PLAIN_LENGTH) |
| 1295 | { |
| 1296 | SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG); |
| 1297 | return -1; |
| 1298 | } |
| 1299 | |
| 1300 | i = dtls1_write_bytes(s, type, buf_, len); |
| 1301 | return i; |
| 1302 | } |
| 1303 | |
| 1304 | |
| 1305 | /* this only happens when a client hello is received and a handshake |
| 1306 | * is started. */ |
| 1307 | static int |
| 1308 | have_handshake_fragment(SSL *s, int type, unsigned char *buf, |
| 1309 | int len, int peek) |
| 1310 | { |
| 1311 | |
| 1312 | if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0)) |
| 1313 | /* (partially) satisfy request from storage */ |
| 1314 | { |
| 1315 | unsigned char *src = s->d1->handshake_fragment; |
| 1316 | unsigned char *dst = buf; |
| 1317 | unsigned int k,n; |
| 1318 | |
| 1319 | /* peek == 0 */ |
| 1320 | n = 0; |
| 1321 | while ((len > 0) && (s->d1->handshake_fragment_len > 0)) |
| 1322 | { |
| 1323 | *dst++ = *src++; |
| 1324 | len--; s->d1->handshake_fragment_len--; |
| 1325 | n++; |
| 1326 | } |
| 1327 | /* move any remaining fragment bytes: */ |
| 1328 | for (k = 0; k < s->d1->handshake_fragment_len; k++) |
| 1329 | s->d1->handshake_fragment[k] = *src++; |
| 1330 | return n; |
| 1331 | } |
| 1332 | |
| 1333 | return 0; |
| 1334 | } |
| 1335 | |
| 1336 | |
| 1337 | |
| 1338 | |
| 1339 | /* Call this to write data in records of type 'type' |
| 1340 | * It will return <= 0 if not all data has been sent or non-blocking IO. |
| 1341 | */ |
| 1342 | int dtls1_write_bytes(SSL *s, int type, const void *buf, int len) |
| 1343 | { |
| 1344 | int i; |
| 1345 | |
| 1346 | OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH); |
| 1347 | s->rwstate=SSL_NOTHING; |
| 1348 | i=do_dtls1_write(s, type, buf, len, 0); |
| 1349 | return i; |
| 1350 | } |
| 1351 | |
| 1352 | int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment) |
| 1353 | { |
| 1354 | unsigned char *p,*pseq; |
| 1355 | int i,mac_size,clear=0; |
| 1356 | int prefix_len = 0; |
| 1357 | SSL3_RECORD *wr; |
| 1358 | SSL3_BUFFER *wb; |
| 1359 | SSL_SESSION *sess; |
| 1360 | int bs; |
| 1361 | unsigned int len_with_overhead = len + SSL3_RT_DEFAULT_WRITE_OVERHEAD; |
| 1362 | |
| 1363 | /* first check if there is a SSL3_BUFFER still being written |
| 1364 | * out. This will happen with non blocking IO */ |
| 1365 | if (s->s3->wbuf.left != 0) |
| 1366 | { |
| 1367 | OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */ |
| 1368 | return(ssl3_write_pending(s,type,buf,len)); |
| 1369 | } |
| 1370 | |
| 1371 | if (s->s3->wbuf.len < len_with_overhead) |
| 1372 | { |
| 1373 | if ((p=OPENSSL_realloc(s->s3->wbuf.buf, len_with_overhead)) == NULL) { |
| 1374 | SSLerr(SSL_F_DO_DTLS1_WRITE,ERR_R_MALLOC_FAILURE); |
| 1375 | goto err; |
| 1376 | } |
| 1377 | s->s3->wbuf.buf = p; |
| 1378 | s->s3->wbuf.len = len_with_overhead; |
| 1379 | } |
| 1380 | |
| 1381 | /* If we have an alert to send, lets send it */ |
| 1382 | if (s->s3->alert_dispatch) |
| 1383 | { |
| 1384 | i=s->method->ssl_dispatch_alert(s); |
| 1385 | if (i <= 0) |
| 1386 | return(i); |
| 1387 | /* if it went, fall through and send more stuff */ |
| 1388 | } |
| 1389 | |
| 1390 | if (len == 0 && !create_empty_fragment) |
| 1391 | return 0; |
| 1392 | |
| 1393 | wr= &(s->s3->wrec); |
| 1394 | wb= &(s->s3->wbuf); |
| 1395 | sess=s->session; |
| 1396 | |
| 1397 | if ( (sess == NULL) || |
| 1398 | (s->enc_write_ctx == NULL) || |
| 1399 | (EVP_MD_CTX_md(s->write_hash) == NULL)) |
| 1400 | clear=1; |
| 1401 | |
| 1402 | if (clear) |
| 1403 | mac_size=0; |
| 1404 | else |
| 1405 | { |
| 1406 | mac_size=EVP_MD_CTX_size(s->write_hash); |
| 1407 | if (mac_size < 0) |
| 1408 | goto err; |
| 1409 | } |
| 1410 | |
| 1411 | /* DTLS implements explicit IV, so no need for empty fragments */ |
| 1412 | #if 0 |
| 1413 | /* 'create_empty_fragment' is true only when this function calls itself */ |
| 1414 | if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done |
| 1415 | && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER) |
| 1416 | { |
| 1417 | /* countermeasure against known-IV weakness in CBC ciphersuites |
| 1418 | * (see http://www.openssl.org/~bodo/tls-cbc.txt) |
| 1419 | */ |
| 1420 | |
| 1421 | if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) |
| 1422 | { |
| 1423 | /* recursive function call with 'create_empty_fragment' set; |
| 1424 | * this prepares and buffers the data for an empty fragment |
| 1425 | * (these 'prefix_len' bytes are sent out later |
| 1426 | * together with the actual payload) */ |
| 1427 | prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1); |
| 1428 | if (prefix_len <= 0) |
| 1429 | goto err; |
| 1430 | |
| 1431 | if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE) |
| 1432 | { |
| 1433 | /* insufficient space */ |
| 1434 | SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR); |
| 1435 | goto err; |
| 1436 | } |
| 1437 | } |
| 1438 | |
| 1439 | s->s3->empty_fragment_done = 1; |
| 1440 | } |
| 1441 | #endif |
| 1442 | p = wb->buf + prefix_len; |
| 1443 | |
| 1444 | /* write the header */ |
| 1445 | |
| 1446 | *(p++)=type&0xff; |
| 1447 | wr->type=type; |
| 1448 | |
| 1449 | *(p++)=(s->version>>8); |
| 1450 | *(p++)=s->version&0xff; |
| 1451 | |
| 1452 | /* field where we are to write out packet epoch, seq num and len */ |
| 1453 | pseq=p; |
| 1454 | p+=10; |
| 1455 | |
| 1456 | /* lets setup the record stuff. */ |
| 1457 | |
| 1458 | /* Make space for the explicit IV in case of CBC. |
| 1459 | * (this is a bit of a boundary violation, but what the heck). |
| 1460 | */ |
| 1461 | if ( s->enc_write_ctx && |
| 1462 | (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE)) |
| 1463 | bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher); |
| 1464 | else |
| 1465 | bs = 0; |
| 1466 | |
| 1467 | wr->data=p + bs; /* make room for IV in case of CBC */ |
| 1468 | wr->length=(int)len; |
| 1469 | wr->input=(unsigned char *)buf; |
| 1470 | |
| 1471 | /* we now 'read' from wr->input, wr->length bytes into |
| 1472 | * wr->data */ |
| 1473 | |
| 1474 | /* first we compress */ |
| 1475 | if (s->compress != NULL) |
| 1476 | { |
| 1477 | if (!ssl3_do_compress(s)) |
| 1478 | { |
| 1479 | SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE); |
| 1480 | goto err; |
| 1481 | } |
| 1482 | } |
| 1483 | else |
| 1484 | { |
| 1485 | memcpy(wr->data,wr->input,wr->length); |
| 1486 | wr->input=wr->data; |
| 1487 | } |
| 1488 | |
| 1489 | /* we should still have the output to wr->data and the input |
| 1490 | * from wr->input. Length should be wr->length. |
| 1491 | * wr->data still points in the wb->buf */ |
| 1492 | |
| 1493 | if (mac_size != 0) |
| 1494 | { |
| 1495 | if(s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1) < 0) |
| 1496 | goto err; |
| 1497 | wr->length+=mac_size; |
| 1498 | } |
| 1499 | |
| 1500 | /* this is true regardless of mac size */ |
| 1501 | wr->input=p; |
| 1502 | wr->data=p; |
| 1503 | |
| 1504 | |
| 1505 | /* ssl3_enc can only have an error on read */ |
| 1506 | if (bs) /* bs != 0 in case of CBC */ |
| 1507 | { |
| 1508 | RAND_pseudo_bytes(p,bs); |
| 1509 | /* master IV and last CBC residue stand for |
| 1510 | * the rest of randomness */ |
| 1511 | wr->length += bs; |
| 1512 | } |
| 1513 | |
| 1514 | s->method->ssl3_enc->enc(s,1); |
| 1515 | |
| 1516 | /* record length after mac and block padding */ |
| 1517 | /* if (type == SSL3_RT_APPLICATION_DATA || |
| 1518 | (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */ |
| 1519 | |
| 1520 | /* there's only one epoch between handshake and app data */ |
| 1521 | |
| 1522 | s2n(s->d1->w_epoch, pseq); |
| 1523 | |
| 1524 | /* XDTLS: ?? */ |
| 1525 | /* else |
| 1526 | s2n(s->d1->handshake_epoch, pseq); */ |
| 1527 | |
| 1528 | memcpy(pseq, &(s->s3->write_sequence[2]), 6); |
| 1529 | pseq+=6; |
| 1530 | s2n(wr->length,pseq); |
| 1531 | |
| 1532 | /* we should now have |
| 1533 | * wr->data pointing to the encrypted data, which is |
| 1534 | * wr->length long */ |
| 1535 | wr->type=type; /* not needed but helps for debugging */ |
| 1536 | wr->length+=DTLS1_RT_HEADER_LENGTH; |
| 1537 | |
| 1538 | #if 0 /* this is now done at the message layer */ |
| 1539 | /* buffer the record, making it easy to handle retransmits */ |
| 1540 | if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC) |
| 1541 | dtls1_buffer_record(s, wr->data, wr->length, |
| 1542 | *((PQ_64BIT *)&(s->s3->write_sequence[0]))); |
| 1543 | #endif |
| 1544 | |
| 1545 | ssl3_record_sequence_update(&(s->s3->write_sequence[0])); |
| 1546 | |
| 1547 | if (create_empty_fragment) |
| 1548 | { |
| 1549 | /* we are in a recursive call; |
| 1550 | * just return the length, don't write out anything here |
| 1551 | */ |
| 1552 | return wr->length; |
| 1553 | } |
| 1554 | |
| 1555 | /* now let's set up wb */ |
| 1556 | wb->left = prefix_len + wr->length; |
| 1557 | wb->offset = 0; |
| 1558 | |
| 1559 | /* memorize arguments so that ssl3_write_pending can detect bad write retries later */ |
| 1560 | s->s3->wpend_tot=len; |
| 1561 | s->s3->wpend_buf=buf; |
| 1562 | s->s3->wpend_type=type; |
| 1563 | s->s3->wpend_ret=len; |
| 1564 | |
| 1565 | /* we now just need to write the buffer */ |
| 1566 | return ssl3_write_pending(s,type,buf,len); |
| 1567 | err: |
| 1568 | return -1; |
| 1569 | } |
| 1570 | |
| 1571 | |
| 1572 | |
| 1573 | static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap) |
| 1574 | { |
| 1575 | int cmp; |
| 1576 | unsigned int shift; |
| 1577 | const unsigned char *seq = s->s3->read_sequence; |
| 1578 | |
| 1579 | cmp = satsub64be(seq,bitmap->max_seq_num); |
| 1580 | if (cmp > 0) |
| 1581 | { |
| 1582 | memcpy (s->s3->rrec.seq_num,seq,8); |
| 1583 | return 1; /* this record in new */ |
| 1584 | } |
| 1585 | shift = -cmp; |
| 1586 | if (shift >= sizeof(bitmap->map)*8) |
| 1587 | return 0; /* stale, outside the window */ |
| 1588 | else if (bitmap->map & (1UL<<shift)) |
| 1589 | return 0; /* record previously received */ |
| 1590 | |
| 1591 | memcpy (s->s3->rrec.seq_num,seq,8); |
| 1592 | return 1; |
| 1593 | } |
| 1594 | |
| 1595 | |
| 1596 | static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap) |
| 1597 | { |
| 1598 | int cmp; |
| 1599 | unsigned int shift; |
| 1600 | const unsigned char *seq = s->s3->read_sequence; |
| 1601 | |
| 1602 | cmp = satsub64be(seq,bitmap->max_seq_num); |
| 1603 | if (cmp > 0) |
| 1604 | { |
| 1605 | shift = cmp; |
| 1606 | if (shift < sizeof(bitmap->map)*8) |
| 1607 | bitmap->map <<= shift, bitmap->map |= 1UL; |
| 1608 | else |
| 1609 | bitmap->map = 1UL; |
| 1610 | memcpy(bitmap->max_seq_num,seq,8); |
| 1611 | } |
| 1612 | else { |
| 1613 | shift = -cmp; |
| 1614 | if (shift < sizeof(bitmap->map)*8) |
| 1615 | bitmap->map |= 1UL<<shift; |
| 1616 | } |
| 1617 | } |
| 1618 | |
| 1619 | |
| 1620 | int dtls1_dispatch_alert(SSL *s) |
| 1621 | { |
| 1622 | int i,j; |
| 1623 | void (*cb)(const SSL *ssl,int type,int val)=NULL; |
| 1624 | unsigned char buf[DTLS1_AL_HEADER_LENGTH]; |
| 1625 | unsigned char *ptr = &buf[0]; |
| 1626 | |
| 1627 | s->s3->alert_dispatch=0; |
| 1628 | |
| 1629 | memset(buf, 0x00, sizeof(buf)); |
| 1630 | *ptr++ = s->s3->send_alert[0]; |
| 1631 | *ptr++ = s->s3->send_alert[1]; |
| 1632 | |
| 1633 | #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE |
| 1634 | if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) |
| 1635 | { |
| 1636 | s2n(s->d1->handshake_read_seq, ptr); |
| 1637 | #if 0 |
| 1638 | if ( s->d1->r_msg_hdr.frag_off == 0) /* waiting for a new msg */ |
| 1639 | |
| 1640 | else |
| 1641 | s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */ |
| 1642 | #endif |
| 1643 | |
| 1644 | #if 0 |
| 1645 | fprintf(stderr, "s->d1->handshake_read_seq = %d, s->d1->r_msg_hdr.seq = %d\n",s->d1->handshake_read_seq,s->d1->r_msg_hdr.seq); |
| 1646 | #endif |
| 1647 | l2n3(s->d1->r_msg_hdr.frag_off, ptr); |
| 1648 | } |
| 1649 | #endif |
| 1650 | |
| 1651 | i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0); |
| 1652 | if (i <= 0) |
| 1653 | { |
| 1654 | s->s3->alert_dispatch=1; |
| 1655 | /* fprintf( stderr, "not done with alert\n" ); */ |
| 1656 | } |
| 1657 | else |
| 1658 | { |
| 1659 | if (s->s3->send_alert[0] == SSL3_AL_FATAL |
| 1660 | #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE |
| 1661 | || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE |
| 1662 | #endif |
| 1663 | ) |
| 1664 | (void)BIO_flush(s->wbio); |
| 1665 | |
| 1666 | if (s->msg_callback) |
| 1667 | s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, |
| 1668 | 2, s, s->msg_callback_arg); |
| 1669 | |
| 1670 | if (s->info_callback != NULL) |
| 1671 | cb=s->info_callback; |
| 1672 | else if (s->ctx->info_callback != NULL) |
| 1673 | cb=s->ctx->info_callback; |
| 1674 | |
| 1675 | if (cb != NULL) |
| 1676 | { |
| 1677 | j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1]; |
| 1678 | cb(s,SSL_CB_WRITE_ALERT,j); |
| 1679 | } |
| 1680 | } |
| 1681 | return(i); |
| 1682 | } |
| 1683 | |
| 1684 | |
| 1685 | static DTLS1_BITMAP * |
| 1686 | dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch) |
| 1687 | { |
| 1688 | |
| 1689 | *is_next_epoch = 0; |
| 1690 | |
| 1691 | /* In current epoch, accept HM, CCS, DATA, & ALERT */ |
| 1692 | if (rr->epoch == s->d1->r_epoch) |
| 1693 | return &s->d1->bitmap; |
| 1694 | |
| 1695 | /* Only HM and ALERT messages can be from the next epoch */ |
| 1696 | else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) && |
| 1697 | (rr->type == SSL3_RT_HANDSHAKE || |
| 1698 | rr->type == SSL3_RT_ALERT)) |
| 1699 | { |
| 1700 | *is_next_epoch = 1; |
| 1701 | return &s->d1->next_bitmap; |
| 1702 | } |
| 1703 | |
| 1704 | return NULL; |
| 1705 | } |
| 1706 | |
| 1707 | #if 0 |
| 1708 | static int |
| 1709 | dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority, |
| 1710 | unsigned long *offset) |
| 1711 | { |
| 1712 | |
| 1713 | /* alerts are passed up immediately */ |
| 1714 | if ( rr->type == SSL3_RT_APPLICATION_DATA || |
| 1715 | rr->type == SSL3_RT_ALERT) |
| 1716 | return 0; |
| 1717 | |
| 1718 | /* Only need to buffer if a handshake is underway. |
| 1719 | * (this implies that Hello Request and Client Hello are passed up |
| 1720 | * immediately) */ |
| 1721 | if ( SSL_in_init(s)) |
| 1722 | { |
| 1723 | unsigned char *data = rr->data; |
| 1724 | /* need to extract the HM/CCS sequence number here */ |
| 1725 | if ( rr->type == SSL3_RT_HANDSHAKE || |
| 1726 | rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) |
| 1727 | { |
| 1728 | unsigned short seq_num; |
| 1729 | struct hm_header_st msg_hdr; |
| 1730 | struct ccs_header_st ccs_hdr; |
| 1731 | |
| 1732 | if ( rr->type == SSL3_RT_HANDSHAKE) |
| 1733 | { |
| 1734 | dtls1_get_message_header(data, &msg_hdr); |
| 1735 | seq_num = msg_hdr.seq; |
| 1736 | *offset = msg_hdr.frag_off; |
| 1737 | } |
| 1738 | else |
| 1739 | { |
| 1740 | dtls1_get_ccs_header(data, &ccs_hdr); |
| 1741 | seq_num = ccs_hdr.seq; |
| 1742 | *offset = 0; |
| 1743 | } |
| 1744 | |
| 1745 | /* this is either a record we're waiting for, or a |
| 1746 | * retransmit of something we happened to previously |
| 1747 | * receive (higher layers will drop the repeat silently */ |
| 1748 | if ( seq_num < s->d1->handshake_read_seq) |
| 1749 | return 0; |
| 1750 | if (rr->type == SSL3_RT_HANDSHAKE && |
| 1751 | seq_num == s->d1->handshake_read_seq && |
| 1752 | msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off) |
| 1753 | return 0; |
| 1754 | else if ( seq_num == s->d1->handshake_read_seq && |
| 1755 | (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC || |
| 1756 | msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off)) |
| 1757 | return 0; |
| 1758 | else |
| 1759 | { |
| 1760 | *priority = seq_num; |
| 1761 | return 1; |
| 1762 | } |
| 1763 | } |
| 1764 | else /* unknown record type */ |
| 1765 | return 0; |
| 1766 | } |
| 1767 | |
| 1768 | return 0; |
| 1769 | } |
| 1770 | #endif |
| 1771 | |
| 1772 | void |
| 1773 | dtls1_reset_seq_numbers(SSL *s, int rw) |
| 1774 | { |
| 1775 | unsigned char *seq; |
| 1776 | unsigned int seq_bytes = sizeof(s->s3->read_sequence); |
| 1777 | |
| 1778 | if ( rw & SSL3_CC_READ) |
| 1779 | { |
| 1780 | seq = s->s3->read_sequence; |
| 1781 | s->d1->r_epoch++; |
| 1782 | memcpy(&(s->d1->bitmap), &(s->d1->next_bitmap), sizeof(DTLS1_BITMAP)); |
| 1783 | memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP)); |
| 1784 | } |
| 1785 | else |
| 1786 | { |
| 1787 | seq = s->s3->write_sequence; |
| 1788 | memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence)); |
| 1789 | s->d1->w_epoch++; |
| 1790 | } |
| 1791 | |
| 1792 | memset(seq, 0x00, seq_bytes); |
| 1793 | } |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 1794 | |
| 1795 | |
| 1796 | static void |
| 1797 | dtls1_clear_timeouts(SSL *s) |
| 1798 | { |
| 1799 | memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st)); |
| 1800 | } |