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 125static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, 126 int len, int peek); 127static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap, 128 PQ_64BIT *seq_num); 129static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap); 130static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, 131 unsigned int *is_next_epoch); 132#if 0 133static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, 134 unsigned short *priority, unsigned long *offset); 135#endif 136static int dtls1_buffer_record(SSL *s, record_pqueue *q, 137 PQ_64BIT *priority); 138static int dtls1_process_record(SSL *s); 139#if PQ_64BIT_IS_INTEGER 140static PQ_64BIT bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num); 141#endif 142static void dtls1_clear_timeouts(SSL *s); 143 144/* copy buffered record into SSL structure */ 145static int 146dtls1_copy_record(SSL *s, pitem *item) 147 { 148 DTLS1_RECORD_DATA *rdata; 149 150 rdata = (DTLS1_RECORD_DATA *)item->data; 151 152 if (s->s3->rbuf.buf != NULL) 153 OPENSSL_free(s->s3->rbuf.buf); 154 155 s->packet = rdata->packet; 156 s->packet_length = rdata->packet_length; 157 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER)); 158 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
| 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 125static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, 126 int len, int peek); 127static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap, 128 PQ_64BIT *seq_num); 129static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap); 130static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, 131 unsigned int *is_next_epoch); 132#if 0 133static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, 134 unsigned short *priority, unsigned long *offset); 135#endif 136static int dtls1_buffer_record(SSL *s, record_pqueue *q, 137 PQ_64BIT *priority); 138static int dtls1_process_record(SSL *s); 139#if PQ_64BIT_IS_INTEGER 140static PQ_64BIT bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num); 141#endif 142static void dtls1_clear_timeouts(SSL *s); 143 144/* copy buffered record into SSL structure */ 145static int 146dtls1_copy_record(SSL *s, pitem *item) 147 { 148 DTLS1_RECORD_DATA *rdata; 149 150 rdata = (DTLS1_RECORD_DATA *)item->data; 151 152 if (s->s3->rbuf.buf != NULL) 153 OPENSSL_free(s->s3->rbuf.buf); 154 155 s->packet = rdata->packet; 156 s->packet_length = rdata->packet_length; 157 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER)); 158 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
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| 159 160 /* Set proper sequence number for mac calculation */ 161 memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6);
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159 160 return(1); 161 } 162 163 164static int 165dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT *priority) 166{ 167 DTLS1_RECORD_DATA *rdata; 168 pitem *item; 169 170 /* Limit the size of the queue to prevent DOS attacks */ 171 if (pqueue_size(queue->q) >= 100) 172 return 0; 173 174 rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA)); 175 item = pitem_new(*priority, rdata); 176 if (rdata == NULL || item == NULL) 177 { 178 if (rdata != NULL) OPENSSL_free(rdata); 179 if (item != NULL) pitem_free(item); 180 181 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); 182 return(0); 183 } 184 185 rdata->packet = s->packet; 186 rdata->packet_length = s->packet_length; 187 memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER)); 188 memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD)); 189 190 item->data = rdata; 191 192 /* insert should not fail, since duplicates are dropped */ 193 if (pqueue_insert(queue->q, item) == NULL) 194 { 195 OPENSSL_free(rdata); 196 pitem_free(item); 197 return(0); 198 } 199 200 s->packet = NULL; 201 s->packet_length = 0; 202 memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER)); 203 memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD)); 204 205 if (!ssl3_setup_buffers(s)) 206 { 207 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); 208 OPENSSL_free(rdata); 209 pitem_free(item); 210 return(0); 211 } 212 213 return(1); 214 } 215 216 217static int 218dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue) 219 { 220 pitem *item; 221 222 item = pqueue_pop(queue->q); 223 if (item) 224 { 225 dtls1_copy_record(s, item); 226 227 OPENSSL_free(item->data); 228 pitem_free(item); 229 230 return(1); 231 } 232 233 return(0); 234 } 235 236 237/* retrieve a buffered record that belongs to the new epoch, i.e., not processed 238 * yet */ 239#define dtls1_get_unprocessed_record(s) \ 240 dtls1_retrieve_buffered_record((s), \ 241 &((s)->d1->unprocessed_rcds)) 242 243/* retrieve a buffered record that belongs to the current epoch, ie, processed */ 244#define dtls1_get_processed_record(s) \ 245 dtls1_retrieve_buffered_record((s), \ 246 &((s)->d1->processed_rcds)) 247 248static int 249dtls1_process_buffered_records(SSL *s) 250 { 251 pitem *item; 252 253 item = pqueue_peek(s->d1->unprocessed_rcds.q); 254 if (item) 255 {
| 162 163 return(1); 164 } 165 166 167static int 168dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT *priority) 169{ 170 DTLS1_RECORD_DATA *rdata; 171 pitem *item; 172 173 /* Limit the size of the queue to prevent DOS attacks */ 174 if (pqueue_size(queue->q) >= 100) 175 return 0; 176 177 rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA)); 178 item = pitem_new(*priority, rdata); 179 if (rdata == NULL || item == NULL) 180 { 181 if (rdata != NULL) OPENSSL_free(rdata); 182 if (item != NULL) pitem_free(item); 183 184 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); 185 return(0); 186 } 187 188 rdata->packet = s->packet; 189 rdata->packet_length = s->packet_length; 190 memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER)); 191 memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD)); 192 193 item->data = rdata; 194 195 /* insert should not fail, since duplicates are dropped */ 196 if (pqueue_insert(queue->q, item) == NULL) 197 { 198 OPENSSL_free(rdata); 199 pitem_free(item); 200 return(0); 201 } 202 203 s->packet = NULL; 204 s->packet_length = 0; 205 memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER)); 206 memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD)); 207 208 if (!ssl3_setup_buffers(s)) 209 { 210 SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); 211 OPENSSL_free(rdata); 212 pitem_free(item); 213 return(0); 214 } 215 216 return(1); 217 } 218 219 220static int 221dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue) 222 { 223 pitem *item; 224 225 item = pqueue_pop(queue->q); 226 if (item) 227 { 228 dtls1_copy_record(s, item); 229 230 OPENSSL_free(item->data); 231 pitem_free(item); 232 233 return(1); 234 } 235 236 return(0); 237 } 238 239 240/* retrieve a buffered record that belongs to the new epoch, i.e., not processed 241 * yet */ 242#define dtls1_get_unprocessed_record(s) \ 243 dtls1_retrieve_buffered_record((s), \ 244 &((s)->d1->unprocessed_rcds)) 245 246/* retrieve a buffered record that belongs to the current epoch, ie, processed */ 247#define dtls1_get_processed_record(s) \ 248 dtls1_retrieve_buffered_record((s), \ 249 &((s)->d1->processed_rcds)) 250 251static int 252dtls1_process_buffered_records(SSL *s) 253 { 254 pitem *item; 255 256 item = pqueue_peek(s->d1->unprocessed_rcds.q); 257 if (item) 258 {
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256 DTLS1_RECORD_DATA *rdata; 257 rdata = (DTLS1_RECORD_DATA *)item->data; 258
| |
259 /* Check if epoch is current. */ 260 if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch) 261 return(1); /* Nothing to do. */ 262 263 /* Process all the records. */ 264 while (pqueue_peek(s->d1->unprocessed_rcds.q)) 265 { 266 dtls1_get_unprocessed_record(s); 267 if ( ! dtls1_process_record(s)) 268 return(0); 269 dtls1_buffer_record(s, &(s->d1->processed_rcds), 270 &s->s3->rrec.seq_num); 271 } 272 } 273 274 /* sync epoch numbers once all the unprocessed records 275 * have been processed */ 276 s->d1->processed_rcds.epoch = s->d1->r_epoch; 277 s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1; 278 279 return(1); 280 } 281 282 283#if 0 284 285static int 286dtls1_get_buffered_record(SSL *s) 287 { 288 pitem *item; 289 PQ_64BIT priority = 290 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) | 291 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off); 292 293 if ( ! SSL_in_init(s)) /* if we're not (re)negotiating, 294 nothing buffered */ 295 return 0; 296 297 298 item = pqueue_peek(s->d1->rcvd_records); 299 if (item && item->priority == priority) 300 { 301 /* Check if we've received the record of interest. It must be 302 * a handshake record, since data records as passed up without 303 * buffering */ 304 DTLS1_RECORD_DATA *rdata; 305 item = pqueue_pop(s->d1->rcvd_records); 306 rdata = (DTLS1_RECORD_DATA *)item->data; 307 308 if (s->s3->rbuf.buf != NULL) 309 OPENSSL_free(s->s3->rbuf.buf); 310 311 s->packet = rdata->packet; 312 s->packet_length = rdata->packet_length; 313 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER)); 314 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD)); 315 316 OPENSSL_free(item->data); 317 pitem_free(item); 318 319 /* s->d1->next_expected_seq_num++; */ 320 return(1); 321 } 322 323 return 0; 324 } 325 326#endif 327 328static int 329dtls1_process_record(SSL *s) 330{
| 259 /* Check if epoch is current. */ 260 if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch) 261 return(1); /* Nothing to do. */ 262 263 /* Process all the records. */ 264 while (pqueue_peek(s->d1->unprocessed_rcds.q)) 265 { 266 dtls1_get_unprocessed_record(s); 267 if ( ! dtls1_process_record(s)) 268 return(0); 269 dtls1_buffer_record(s, &(s->d1->processed_rcds), 270 &s->s3->rrec.seq_num); 271 } 272 } 273 274 /* sync epoch numbers once all the unprocessed records 275 * have been processed */ 276 s->d1->processed_rcds.epoch = s->d1->r_epoch; 277 s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1; 278 279 return(1); 280 } 281 282 283#if 0 284 285static int 286dtls1_get_buffered_record(SSL *s) 287 { 288 pitem *item; 289 PQ_64BIT priority = 290 (((PQ_64BIT)s->d1->handshake_read_seq) << 32) | 291 ((PQ_64BIT)s->d1->r_msg_hdr.frag_off); 292 293 if ( ! SSL_in_init(s)) /* if we're not (re)negotiating, 294 nothing buffered */ 295 return 0; 296 297 298 item = pqueue_peek(s->d1->rcvd_records); 299 if (item && item->priority == priority) 300 { 301 /* Check if we've received the record of interest. It must be 302 * a handshake record, since data records as passed up without 303 * buffering */ 304 DTLS1_RECORD_DATA *rdata; 305 item = pqueue_pop(s->d1->rcvd_records); 306 rdata = (DTLS1_RECORD_DATA *)item->data; 307 308 if (s->s3->rbuf.buf != NULL) 309 OPENSSL_free(s->s3->rbuf.buf); 310 311 s->packet = rdata->packet; 312 s->packet_length = rdata->packet_length; 313 memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER)); 314 memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD)); 315 316 OPENSSL_free(item->data); 317 pitem_free(item); 318 319 /* s->d1->next_expected_seq_num++; */ 320 return(1); 321 } 322 323 return 0; 324 } 325 326#endif 327 328static int 329dtls1_process_record(SSL *s) 330{
|
331 int i,al;
| 331 int al;
|
332 int clear=0; 333 int enc_err; 334 SSL_SESSION *sess; 335 SSL3_RECORD *rr; 336 unsigned int mac_size; 337 unsigned char md[EVP_MAX_MD_SIZE]; 338 339 340 rr= &(s->s3->rrec); 341 sess = s->session; 342 343 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length, 344 * and we have that many bytes in s->packet 345 */ 346 rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]); 347 348 /* ok, we can now read from 's->packet' data into 'rr' 349 * rr->input points at rr->length bytes, which 350 * need to be copied into rr->data by either 351 * the decryption or by the decompression 352 * When the data is 'copied' into the rr->data buffer, 353 * rr->input will be pointed at the new buffer */ 354 355 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ] 356 * rr->length bytes of encrypted compressed stuff. */ 357 358 /* check is not needed I believe */ 359 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) 360 { 361 al=SSL_AD_RECORD_OVERFLOW; 362 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG); 363 goto f_err; 364 } 365 366 /* decrypt in place in 'rr->input' */ 367 rr->data=rr->input; 368 369 enc_err = s->method->ssl3_enc->enc(s,0); 370 if (enc_err <= 0) 371 { 372 if (enc_err == 0) 373 /* SSLerr() and ssl3_send_alert() have been called */ 374 goto err; 375 376 /* otherwise enc_err == -1 */
| 332 int clear=0; 333 int enc_err; 334 SSL_SESSION *sess; 335 SSL3_RECORD *rr; 336 unsigned int mac_size; 337 unsigned char md[EVP_MAX_MD_SIZE]; 338 339 340 rr= &(s->s3->rrec); 341 sess = s->session; 342 343 /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length, 344 * and we have that many bytes in s->packet 345 */ 346 rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]); 347 348 /* ok, we can now read from 's->packet' data into 'rr' 349 * rr->input points at rr->length bytes, which 350 * need to be copied into rr->data by either 351 * the decryption or by the decompression 352 * When the data is 'copied' into the rr->data buffer, 353 * rr->input will be pointed at the new buffer */ 354 355 /* We now have - encrypted [ MAC [ compressed [ plain ] ] ] 356 * rr->length bytes of encrypted compressed stuff. */ 357 358 /* check is not needed I believe */ 359 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) 360 { 361 al=SSL_AD_RECORD_OVERFLOW; 362 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG); 363 goto f_err; 364 } 365 366 /* decrypt in place in 'rr->input' */ 367 rr->data=rr->input; 368 369 enc_err = s->method->ssl3_enc->enc(s,0); 370 if (enc_err <= 0) 371 { 372 if (enc_err == 0) 373 /* SSLerr() and ssl3_send_alert() have been called */ 374 goto err; 375 376 /* otherwise enc_err == -1 */
|
377 goto decryption_failed_or_bad_record_mac;
| 377 goto err;
|
378 } 379 380#ifdef TLS_DEBUG 381printf("dec %d\n",rr->length); 382{ unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); } 383printf("\n"); 384#endif 385 386 /* r->length is now the compressed data plus mac */ 387if ( (sess == NULL) || 388 (s->enc_read_ctx == NULL) || 389 (s->read_hash == NULL)) 390 clear=1; 391 392 if (!clear) 393 { 394 mac_size=EVP_MD_size(s->read_hash); 395 396 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size) 397 { 398#if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */ 399 al=SSL_AD_RECORD_OVERFLOW; 400 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG); 401 goto f_err; 402#else
| 378 } 379 380#ifdef TLS_DEBUG 381printf("dec %d\n",rr->length); 382{ unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); } 383printf("\n"); 384#endif 385 386 /* r->length is now the compressed data plus mac */ 387if ( (sess == NULL) || 388 (s->enc_read_ctx == NULL) || 389 (s->read_hash == NULL)) 390 clear=1; 391 392 if (!clear) 393 { 394 mac_size=EVP_MD_size(s->read_hash); 395 396 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size) 397 { 398#if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */ 399 al=SSL_AD_RECORD_OVERFLOW; 400 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG); 401 goto f_err; 402#else
|
403 goto decryption_failed_or_bad_record_mac;
| 403 goto err;
|
404#endif 405 } 406 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */ 407 if (rr->length < mac_size) 408 { 409#if 0 /* OK only for stream ciphers */ 410 al=SSL_AD_DECODE_ERROR; 411 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT); 412 goto f_err; 413#else
| 404#endif 405 } 406 /* check the MAC for rr->input (it's in mac_size bytes at the tail) */ 407 if (rr->length < mac_size) 408 { 409#if 0 /* OK only for stream ciphers */ 410 al=SSL_AD_DECODE_ERROR; 411 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT); 412 goto f_err; 413#else
|
414 goto decryption_failed_or_bad_record_mac;
| 414 goto err;
|
415#endif 416 } 417 rr->length-=mac_size;
| 415#endif 416 } 417 rr->length-=mac_size;
|
418 i=s->method->ssl3_enc->mac(s,md,0);
| 418 s->method->ssl3_enc->mac(s,md,0);
|
419 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0) 420 {
| 419 if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0) 420 {
|
421 goto decryption_failed_or_bad_record_mac;
| 421 goto err;
|
422 } 423 } 424 425 /* r->length is now just compressed */ 426 if (s->expand != NULL) 427 { 428 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH) 429 { 430 al=SSL_AD_RECORD_OVERFLOW; 431 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG); 432 goto f_err; 433 } 434 if (!ssl3_do_uncompress(s)) 435 { 436 al=SSL_AD_DECOMPRESSION_FAILURE; 437 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION); 438 goto f_err; 439 } 440 } 441 442 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH) 443 { 444 al=SSL_AD_RECORD_OVERFLOW; 445 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG); 446 goto f_err; 447 } 448 449 rr->off=0; 450 /* So at this point the following is true 451 * ssl->s3->rrec.type is the type of record 452 * ssl->s3->rrec.length == number of bytes in record 453 * ssl->s3->rrec.off == offset to first valid byte 454 * ssl->s3->rrec.data == where to take bytes from, increment 455 * after use :-). 456 */ 457 458 /* we have pulled in a full packet so zero things */ 459 s->packet_length=0; 460 dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */ 461 return(1); 462
| 422 } 423 } 424 425 /* r->length is now just compressed */ 426 if (s->expand != NULL) 427 { 428 if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH) 429 { 430 al=SSL_AD_RECORD_OVERFLOW; 431 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG); 432 goto f_err; 433 } 434 if (!ssl3_do_uncompress(s)) 435 { 436 al=SSL_AD_DECOMPRESSION_FAILURE; 437 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION); 438 goto f_err; 439 } 440 } 441 442 if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH) 443 { 444 al=SSL_AD_RECORD_OVERFLOW; 445 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG); 446 goto f_err; 447 } 448 449 rr->off=0; 450 /* So at this point the following is true 451 * ssl->s3->rrec.type is the type of record 452 * ssl->s3->rrec.length == number of bytes in record 453 * ssl->s3->rrec.off == offset to first valid byte 454 * ssl->s3->rrec.data == where to take bytes from, increment 455 * after use :-). 456 */ 457 458 /* we have pulled in a full packet so zero things */ 459 s->packet_length=0; 460 dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */ 461 return(1); 462
|
463decryption_failed_or_bad_record_mac: 464 /* Separate 'decryption_failed' alert was introduced with TLS 1.0, 465 * SSL 3.0 only has 'bad_record_mac'. But unless a decryption 466 * failure is directly visible from the ciphertext anyway, 467 * we should not reveal which kind of error occured -- this 468 * might become visible to an attacker (e.g. via logfile) */ 469 al=SSL_AD_BAD_RECORD_MAC; 470 SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
| |
471f_err: 472 ssl3_send_alert(s,SSL3_AL_FATAL,al); 473err: 474 return(0); 475} 476 477 478/* Call this to get a new input record. 479 * It will return <= 0 if more data is needed, normally due to an error 480 * or non-blocking IO. 481 * When it finishes, one packet has been decoded and can be found in 482 * ssl->s3->rrec.type - is the type of record 483 * ssl->s3->rrec.data, - data 484 * ssl->s3->rrec.length, - number of bytes 485 */ 486/* used only by dtls1_read_bytes */ 487int dtls1_get_record(SSL *s) 488 { 489 int ssl_major,ssl_minor; 490 int i,n; 491 SSL3_RECORD *rr;
| 463f_err: 464 ssl3_send_alert(s,SSL3_AL_FATAL,al); 465err: 466 return(0); 467} 468 469 470/* Call this to get a new input record. 471 * It will return <= 0 if more data is needed, normally due to an error 472 * or non-blocking IO. 473 * When it finishes, one packet has been decoded and can be found in 474 * ssl->s3->rrec.type - is the type of record 475 * ssl->s3->rrec.data, - data 476 * ssl->s3->rrec.length, - number of bytes 477 */ 478/* used only by dtls1_read_bytes */ 479int dtls1_get_record(SSL *s) 480 { 481 int ssl_major,ssl_minor; 482 int i,n; 483 SSL3_RECORD *rr;
|
492 SSL_SESSION *sess;
| |
493 unsigned char *p = NULL; 494 unsigned short version; 495 DTLS1_BITMAP *bitmap; 496 unsigned int is_next_epoch; 497 498 rr= &(s->s3->rrec);
| 484 unsigned char *p = NULL; 485 unsigned short version; 486 DTLS1_BITMAP *bitmap; 487 unsigned int is_next_epoch; 488 489 rr= &(s->s3->rrec);
|
499 sess=s->session;
| |
500 501 /* The epoch may have changed. If so, process all the 502 * pending records. This is a non-blocking operation. */
| 490 491 /* The epoch may have changed. If so, process all the 492 * pending records. This is a non-blocking operation. */
|
503 if ( ! dtls1_process_buffered_records(s)) 504 return 0;
| 493 dtls1_process_buffered_records(s);
|
505 506 /* if we're renegotiating, then there may be buffered records */ 507 if (dtls1_get_processed_record(s)) 508 return 1; 509 510 /* get something from the wire */ 511again: 512 /* check if we have the header */ 513 if ( (s->rstate != SSL_ST_READ_BODY) || 514 (s->packet_length < DTLS1_RT_HEADER_LENGTH)) 515 { 516 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0); 517 /* read timeout is handled by dtls1_read_bytes */ 518 if (n <= 0) return(n); /* error or non-blocking */ 519 520 /* this packet contained a partial record, dump it */ 521 if (s->packet_length != DTLS1_RT_HEADER_LENGTH) 522 { 523 s->packet_length = 0; 524 goto again; 525 } 526 527 s->rstate=SSL_ST_READ_BODY; 528 529 p=s->packet; 530 531 /* Pull apart the header into the DTLS1_RECORD */ 532 rr->type= *(p++); 533 ssl_major= *(p++); 534 ssl_minor= *(p++); 535 version=(ssl_major<<8)|ssl_minor; 536 537 /* sequence number is 64 bits, with top 2 bytes = epoch */ 538 n2s(p,rr->epoch); 539 540 memcpy(&(s->s3->read_sequence[2]), p, 6); 541 p+=6; 542 543 n2s(p,rr->length); 544 545 /* Lets check version */ 546 if (!s->first_packet) 547 { 548 if (version != s->version && version != DTLS1_BAD_VER) 549 { 550 /* unexpected version, silently discard */ 551 rr->length = 0; 552 s->packet_length = 0; 553 goto again; 554 } 555 } 556 557 if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) && 558 (version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) 559 { 560 /* wrong version, silently discard record */ 561 rr->length = 0; 562 s->packet_length = 0; 563 goto again; 564 } 565 566 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) 567 { 568 /* record too long, silently discard it */ 569 rr->length = 0; 570 s->packet_length = 0; 571 goto again; 572 } 573 574 s->client_version = version; 575 /* now s->rstate == SSL_ST_READ_BODY */ 576 } 577 578 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */ 579 580 if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH) 581 { 582 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */ 583 i=rr->length; 584 n=ssl3_read_n(s,i,i,1); 585 if (n <= 0) return(n); /* error or non-blocking io */ 586 587 /* this packet contained a partial record, dump it */ 588 if ( n != i) 589 { 590 rr->length = 0; 591 s->packet_length = 0; 592 goto again; 593 } 594 595 /* now n == rr->length, 596 * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */ 597 } 598 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */ 599 600 /* match epochs. NULL means the packet is dropped on the floor */ 601 bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch); 602 if ( bitmap == NULL) 603 { 604 rr->length = 0; 605 s->packet_length = 0; /* dump this record */ 606 goto again; /* get another record */ 607 } 608 609 /* Check whether this is a repeat, or aged record. 610 * Don't check if we're listening and this message is 611 * a ClientHello. They can look as if they're replayed, 612 * since they arrive from different connections and 613 * would be dropped unnecessarily. 614 */ 615 if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE && 616 *p == SSL3_MT_CLIENT_HELLO) && 617 ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num))) 618 { 619 rr->length = 0; 620 s->packet_length=0; /* dump this record */ 621 goto again; /* get another record */ 622 } 623 624 /* just read a 0 length packet */ 625 if (rr->length == 0) goto again; 626
| 494 495 /* if we're renegotiating, then there may be buffered records */ 496 if (dtls1_get_processed_record(s)) 497 return 1; 498 499 /* get something from the wire */ 500again: 501 /* check if we have the header */ 502 if ( (s->rstate != SSL_ST_READ_BODY) || 503 (s->packet_length < DTLS1_RT_HEADER_LENGTH)) 504 { 505 n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0); 506 /* read timeout is handled by dtls1_read_bytes */ 507 if (n <= 0) return(n); /* error or non-blocking */ 508 509 /* this packet contained a partial record, dump it */ 510 if (s->packet_length != DTLS1_RT_HEADER_LENGTH) 511 { 512 s->packet_length = 0; 513 goto again; 514 } 515 516 s->rstate=SSL_ST_READ_BODY; 517 518 p=s->packet; 519 520 /* Pull apart the header into the DTLS1_RECORD */ 521 rr->type= *(p++); 522 ssl_major= *(p++); 523 ssl_minor= *(p++); 524 version=(ssl_major<<8)|ssl_minor; 525 526 /* sequence number is 64 bits, with top 2 bytes = epoch */ 527 n2s(p,rr->epoch); 528 529 memcpy(&(s->s3->read_sequence[2]), p, 6); 530 p+=6; 531 532 n2s(p,rr->length); 533 534 /* Lets check version */ 535 if (!s->first_packet) 536 { 537 if (version != s->version && version != DTLS1_BAD_VER) 538 { 539 /* unexpected version, silently discard */ 540 rr->length = 0; 541 s->packet_length = 0; 542 goto again; 543 } 544 } 545 546 if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) && 547 (version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) 548 { 549 /* wrong version, silently discard record */ 550 rr->length = 0; 551 s->packet_length = 0; 552 goto again; 553 } 554 555 if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) 556 { 557 /* record too long, silently discard it */ 558 rr->length = 0; 559 s->packet_length = 0; 560 goto again; 561 } 562 563 s->client_version = version; 564 /* now s->rstate == SSL_ST_READ_BODY */ 565 } 566 567 /* s->rstate == SSL_ST_READ_BODY, get and decode the data */ 568 569 if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH) 570 { 571 /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */ 572 i=rr->length; 573 n=ssl3_read_n(s,i,i,1); 574 if (n <= 0) return(n); /* error or non-blocking io */ 575 576 /* this packet contained a partial record, dump it */ 577 if ( n != i) 578 { 579 rr->length = 0; 580 s->packet_length = 0; 581 goto again; 582 } 583 584 /* now n == rr->length, 585 * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */ 586 } 587 s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */ 588 589 /* match epochs. NULL means the packet is dropped on the floor */ 590 bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch); 591 if ( bitmap == NULL) 592 { 593 rr->length = 0; 594 s->packet_length = 0; /* dump this record */ 595 goto again; /* get another record */ 596 } 597 598 /* Check whether this is a repeat, or aged record. 599 * Don't check if we're listening and this message is 600 * a ClientHello. They can look as if they're replayed, 601 * since they arrive from different connections and 602 * would be dropped unnecessarily. 603 */ 604 if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE && 605 *p == SSL3_MT_CLIENT_HELLO) && 606 ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num))) 607 { 608 rr->length = 0; 609 s->packet_length=0; /* dump this record */ 610 goto again; /* get another record */ 611 } 612 613 /* just read a 0 length packet */ 614 if (rr->length == 0) goto again; 615
|
627 /* If this record is from the next epoch (either HM or ALERT), buffer it 628 * since it cannot be processed at this time. 629 * Records from the next epoch are marked as received even though they are 630 * not processed, so as to prevent any potential resource DoS attack */ 631 if (is_next_epoch) 632 { 633 dtls1_record_bitmap_update(s, bitmap); 634 dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), &rr->seq_num); 635 rr->length = 0;
| 616 /* If this record is from the next epoch (either HM or ALERT), 617 * and a handshake is currently in progress, buffer it since it 618 * cannot be processed at this time. */ 619 if (is_next_epoch) 620 { 621 if (SSL_in_init(s) || s->in_handshake) 622 { 623 dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), &rr->seq_num); 624 } 625 rr->length = 0;
|
636 s->packet_length = 0; 637 goto again; 638 } 639
| 626 s->packet_length = 0; 627 goto again; 628 } 629
|
640 if ( ! dtls1_process_record(s)) 641 return(0);
| 630 if (!dtls1_process_record(s)) 631 { 632 rr->length = 0; 633 s->packet_length=0; /* dump this record */ 634 goto again; /* get another record */ 635 }
|
642 643 dtls1_clear_timeouts(s); /* done waiting */ 644 return(1); 645 646 } 647 648/* Return up to 'len' payload bytes received in 'type' records. 649 * 'type' is one of the following: 650 * 651 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) 652 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) 653 * - 0 (during a shutdown, no data has to be returned) 654 * 655 * If we don't have stored data to work from, read a SSL/TLS record first 656 * (possibly multiple records if we still don't have anything to return). 657 * 658 * This function must handle any surprises the peer may have for us, such as 659 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really 660 * a surprise, but handled as if it were), or renegotiation requests. 661 * Also if record payloads contain fragments too small to process, we store 662 * them until there is enough for the respective protocol (the record protocol 663 * may use arbitrary fragmentation and even interleaving): 664 * Change cipher spec protocol 665 * just 1 byte needed, no need for keeping anything stored 666 * Alert protocol 667 * 2 bytes needed (AlertLevel, AlertDescription) 668 * Handshake protocol 669 * 4 bytes needed (HandshakeType, uint24 length) -- we just have 670 * to detect unexpected Client Hello and Hello Request messages 671 * here, anything else is handled by higher layers 672 * Application data protocol 673 * none of our business 674 */ 675int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) 676 { 677 int al,i,j,ret; 678 unsigned int n; 679 SSL3_RECORD *rr; 680 void (*cb)(const SSL *ssl,int type2,int val)=NULL; 681 682 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */ 683 if (!ssl3_setup_buffers(s)) 684 return(-1); 685 686 /* XXX: check what the second '&& type' is about */ 687 if ((type && (type != SSL3_RT_APPLICATION_DATA) && 688 (type != SSL3_RT_HANDSHAKE) && type) || 689 (peek && (type != SSL3_RT_APPLICATION_DATA))) 690 { 691 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); 692 return -1; 693 } 694 695 /* check whether there's a handshake message (client hello?) waiting */ 696 if ( (ret = have_handshake_fragment(s, type, buf, len, peek))) 697 return ret; 698 699 /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */ 700 701 if (!s->in_handshake && SSL_in_init(s)) 702 { 703 /* type == SSL3_RT_APPLICATION_DATA */ 704 i=s->handshake_func(s); 705 if (i < 0) return(i); 706 if (i == 0) 707 { 708 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 709 return(-1); 710 } 711 } 712 713start: 714 s->rwstate=SSL_NOTHING; 715 716 /* s->s3->rrec.type - is the type of record 717 * s->s3->rrec.data, - data 718 * s->s3->rrec.off, - offset into 'data' for next read 719 * s->s3->rrec.length, - number of bytes. */ 720 rr = &(s->s3->rrec); 721 722 /* We are not handshaking and have no data yet, 723 * so process data buffered during the last handshake 724 * in advance, if any. 725 */ 726 if (s->state == SSL_ST_OK && rr->length == 0) 727 { 728 pitem *item; 729 item = pqueue_pop(s->d1->buffered_app_data.q); 730 if (item) 731 { 732 dtls1_copy_record(s, item); 733 734 OPENSSL_free(item->data); 735 pitem_free(item); 736 } 737 } 738 739 /* Check for timeout */ 740 if (dtls1_handle_timeout(s) > 0) 741 goto start; 742 743 /* get new packet if necessary */ 744 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) 745 { 746 ret=dtls1_get_record(s); 747 if (ret <= 0) 748 { 749 ret = dtls1_read_failed(s, ret); 750 /* anything other than a timeout is an error */ 751 if (ret <= 0) 752 return(ret); 753 else 754 goto start; 755 } 756 } 757 758 /* we now have a packet which can be read and processed */ 759 760 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, 761 * reset by ssl3_get_finished */ 762 && (rr->type != SSL3_RT_HANDSHAKE)) 763 { 764 /* We now have application data between CCS and Finished. 765 * Most likely the packets were reordered on their way, so 766 * buffer the application data for later processing rather 767 * than dropping the connection. 768 */
| 636 637 dtls1_clear_timeouts(s); /* done waiting */ 638 return(1); 639 640 } 641 642/* Return up to 'len' payload bytes received in 'type' records. 643 * 'type' is one of the following: 644 * 645 * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) 646 * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) 647 * - 0 (during a shutdown, no data has to be returned) 648 * 649 * If we don't have stored data to work from, read a SSL/TLS record first 650 * (possibly multiple records if we still don't have anything to return). 651 * 652 * This function must handle any surprises the peer may have for us, such as 653 * Alert records (e.g. close_notify), ChangeCipherSpec records (not really 654 * a surprise, but handled as if it were), or renegotiation requests. 655 * Also if record payloads contain fragments too small to process, we store 656 * them until there is enough for the respective protocol (the record protocol 657 * may use arbitrary fragmentation and even interleaving): 658 * Change cipher spec protocol 659 * just 1 byte needed, no need for keeping anything stored 660 * Alert protocol 661 * 2 bytes needed (AlertLevel, AlertDescription) 662 * Handshake protocol 663 * 4 bytes needed (HandshakeType, uint24 length) -- we just have 664 * to detect unexpected Client Hello and Hello Request messages 665 * here, anything else is handled by higher layers 666 * Application data protocol 667 * none of our business 668 */ 669int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) 670 { 671 int al,i,j,ret; 672 unsigned int n; 673 SSL3_RECORD *rr; 674 void (*cb)(const SSL *ssl,int type2,int val)=NULL; 675 676 if (s->s3->rbuf.buf == NULL) /* Not initialized yet */ 677 if (!ssl3_setup_buffers(s)) 678 return(-1); 679 680 /* XXX: check what the second '&& type' is about */ 681 if ((type && (type != SSL3_RT_APPLICATION_DATA) && 682 (type != SSL3_RT_HANDSHAKE) && type) || 683 (peek && (type != SSL3_RT_APPLICATION_DATA))) 684 { 685 SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); 686 return -1; 687 } 688 689 /* check whether there's a handshake message (client hello?) waiting */ 690 if ( (ret = have_handshake_fragment(s, type, buf, len, peek))) 691 return ret; 692 693 /* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */ 694 695 if (!s->in_handshake && SSL_in_init(s)) 696 { 697 /* type == SSL3_RT_APPLICATION_DATA */ 698 i=s->handshake_func(s); 699 if (i < 0) return(i); 700 if (i == 0) 701 { 702 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 703 return(-1); 704 } 705 } 706 707start: 708 s->rwstate=SSL_NOTHING; 709 710 /* s->s3->rrec.type - is the type of record 711 * s->s3->rrec.data, - data 712 * s->s3->rrec.off, - offset into 'data' for next read 713 * s->s3->rrec.length, - number of bytes. */ 714 rr = &(s->s3->rrec); 715 716 /* We are not handshaking and have no data yet, 717 * so process data buffered during the last handshake 718 * in advance, if any. 719 */ 720 if (s->state == SSL_ST_OK && rr->length == 0) 721 { 722 pitem *item; 723 item = pqueue_pop(s->d1->buffered_app_data.q); 724 if (item) 725 { 726 dtls1_copy_record(s, item); 727 728 OPENSSL_free(item->data); 729 pitem_free(item); 730 } 731 } 732 733 /* Check for timeout */ 734 if (dtls1_handle_timeout(s) > 0) 735 goto start; 736 737 /* get new packet if necessary */ 738 if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) 739 { 740 ret=dtls1_get_record(s); 741 if (ret <= 0) 742 { 743 ret = dtls1_read_failed(s, ret); 744 /* anything other than a timeout is an error */ 745 if (ret <= 0) 746 return(ret); 747 else 748 goto start; 749 } 750 } 751 752 /* we now have a packet which can be read and processed */ 753 754 if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, 755 * reset by ssl3_get_finished */ 756 && (rr->type != SSL3_RT_HANDSHAKE)) 757 { 758 /* We now have application data between CCS and Finished. 759 * Most likely the packets were reordered on their way, so 760 * buffer the application data for later processing rather 761 * than dropping the connection. 762 */
|
769 dtls1_buffer_record(s, &(s->d1->buffered_app_data), 0);
| 763 dtls1_buffer_record(s, &(s->d1->buffered_app_data), &rr->seq_num);
|
770 rr->length = 0; 771 goto start; 772 } 773 774 /* If the other end has shut down, throw anything we read away 775 * (even in 'peek' mode) */ 776 if (s->shutdown & SSL_RECEIVED_SHUTDOWN) 777 { 778 rr->length=0; 779 s->rwstate=SSL_NOTHING; 780 return(0); 781 } 782 783 784 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */ 785 { 786 /* make sure that we are not getting application data when we 787 * are doing a handshake for the first time */ 788 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && 789 (s->enc_read_ctx == NULL)) 790 { 791 al=SSL_AD_UNEXPECTED_MESSAGE; 792 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE); 793 goto f_err; 794 } 795 796 if (len <= 0) return(len); 797 798 if ((unsigned int)len > rr->length) 799 n = rr->length; 800 else 801 n = (unsigned int)len; 802 803 memcpy(buf,&(rr->data[rr->off]),n); 804 if (!peek) 805 { 806 rr->length-=n; 807 rr->off+=n; 808 if (rr->length == 0) 809 { 810 s->rstate=SSL_ST_READ_HEADER; 811 rr->off=0; 812 } 813 } 814 return(n); 815 } 816 817 818 /* If we get here, then type != rr->type; if we have a handshake 819 * message, then it was unexpected (Hello Request or Client Hello). */ 820 821 /* In case of record types for which we have 'fragment' storage, 822 * fill that so that we can process the data at a fixed place. 823 */ 824 { 825 unsigned int k, dest_maxlen = 0; 826 unsigned char *dest = NULL; 827 unsigned int *dest_len = NULL; 828 829 if (rr->type == SSL3_RT_HANDSHAKE) 830 { 831 dest_maxlen = sizeof s->d1->handshake_fragment; 832 dest = s->d1->handshake_fragment; 833 dest_len = &s->d1->handshake_fragment_len; 834 } 835 else if (rr->type == SSL3_RT_ALERT) 836 { 837 dest_maxlen = sizeof(s->d1->alert_fragment); 838 dest = s->d1->alert_fragment; 839 dest_len = &s->d1->alert_fragment_len; 840 } 841 /* else it's a CCS message, or application data or wrong */ 842 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC) 843 { 844 /* Application data while renegotiating 845 * is allowed. Try again reading. 846 */ 847 if (rr->type == SSL3_RT_APPLICATION_DATA) 848 { 849 BIO *bio; 850 s->s3->in_read_app_data=2; 851 bio=SSL_get_rbio(s); 852 s->rwstate=SSL_READING; 853 BIO_clear_retry_flags(bio); 854 BIO_set_retry_read(bio); 855 return(-1); 856 } 857 858 /* Not certain if this is the right error handling */ 859 al=SSL_AD_UNEXPECTED_MESSAGE; 860 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); 861 goto f_err; 862 } 863 864 if (dest_maxlen > 0) 865 { 866 /* XDTLS: In a pathalogical case, the Client Hello 867 * may be fragmented--don't always expect dest_maxlen bytes */ 868 if ( rr->length < dest_maxlen) 869 { 870#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 871 /* 872 * for normal alerts rr->length is 2, while 873 * dest_maxlen is 7 if we were to handle this 874 * non-existing alert... 875 */ 876 FIX ME 877#endif 878 s->rstate=SSL_ST_READ_HEADER; 879 rr->length = 0; 880 goto start; 881 } 882 883 /* now move 'n' bytes: */ 884 for ( k = 0; k < dest_maxlen; k++) 885 { 886 dest[k] = rr->data[rr->off++]; 887 rr->length--; 888 } 889 *dest_len = dest_maxlen; 890 } 891 } 892 893 /* s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE; 894 * s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT. 895 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */ 896 897 /* If we are a client, check for an incoming 'Hello Request': */ 898 if ((!s->server) && 899 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && 900 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && 901 (s->session != NULL) && (s->session->cipher != NULL)) 902 { 903 s->d1->handshake_fragment_len = 0; 904 905 if ((s->d1->handshake_fragment[1] != 0) || 906 (s->d1->handshake_fragment[2] != 0) || 907 (s->d1->handshake_fragment[3] != 0)) 908 { 909 al=SSL_AD_DECODE_ERROR; 910 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST); 911 goto err; 912 } 913 914 /* no need to check sequence number on HELLO REQUEST messages */ 915 916 if (s->msg_callback) 917 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, 918 s->d1->handshake_fragment, 4, s, s->msg_callback_arg); 919 920 if (SSL_is_init_finished(s) && 921 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && 922 !s->s3->renegotiate) 923 { 924 ssl3_renegotiate(s); 925 if (ssl3_renegotiate_check(s)) 926 { 927 i=s->handshake_func(s); 928 if (i < 0) return(i); 929 if (i == 0) 930 { 931 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 932 return(-1); 933 } 934 935 if (!(s->mode & SSL_MODE_AUTO_RETRY)) 936 { 937 if (s->s3->rbuf.left == 0) /* no read-ahead left? */ 938 { 939 BIO *bio; 940 /* In the case where we try to read application data, 941 * but we trigger an SSL handshake, we return -1 with 942 * the retry option set. Otherwise renegotiation may 943 * cause nasty problems in the blocking world */ 944 s->rwstate=SSL_READING; 945 bio=SSL_get_rbio(s); 946 BIO_clear_retry_flags(bio); 947 BIO_set_retry_read(bio); 948 return(-1); 949 } 950 } 951 } 952 } 953 /* we either finished a handshake or ignored the request, 954 * now try again to obtain the (application) data we were asked for */ 955 goto start; 956 } 957 958 if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) 959 { 960 int alert_level = s->d1->alert_fragment[0]; 961 int alert_descr = s->d1->alert_fragment[1]; 962 963 s->d1->alert_fragment_len = 0; 964 965 if (s->msg_callback) 966 s->msg_callback(0, s->version, SSL3_RT_ALERT, 967 s->d1->alert_fragment, 2, s, s->msg_callback_arg); 968 969 if (s->info_callback != NULL) 970 cb=s->info_callback; 971 else if (s->ctx->info_callback != NULL) 972 cb=s->ctx->info_callback; 973 974 if (cb != NULL) 975 { 976 j = (alert_level << 8) | alert_descr; 977 cb(s, SSL_CB_READ_ALERT, j); 978 } 979 980 if (alert_level == 1) /* warning */ 981 { 982 s->s3->warn_alert = alert_descr; 983 if (alert_descr == SSL_AD_CLOSE_NOTIFY) 984 { 985 s->shutdown |= SSL_RECEIVED_SHUTDOWN; 986 return(0); 987 } 988#if 0 989 /* XXX: this is a possible improvement in the future */ 990 /* now check if it's a missing record */ 991 if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) 992 { 993 unsigned short seq; 994 unsigned int frag_off; 995 unsigned char *p = &(s->d1->alert_fragment[2]); 996 997 n2s(p, seq); 998 n2l3(p, frag_off); 999 1000 dtls1_retransmit_message(s, 1001 dtls1_get_queue_priority(frag->msg_header.seq, 0), 1002 frag_off, &found); 1003 if ( ! found && SSL_in_init(s)) 1004 { 1005 /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */ 1006 /* requested a message not yet sent, 1007 send an alert ourselves */ 1008 ssl3_send_alert(s,SSL3_AL_WARNING, 1009 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); 1010 } 1011 } 1012#endif 1013 } 1014 else if (alert_level == 2) /* fatal */ 1015 { 1016 char tmp[16]; 1017 1018 s->rwstate=SSL_NOTHING; 1019 s->s3->fatal_alert = alert_descr; 1020 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); 1021 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr); 1022 ERR_add_error_data(2,"SSL alert number ",tmp); 1023 s->shutdown|=SSL_RECEIVED_SHUTDOWN; 1024 SSL_CTX_remove_session(s->ctx,s->session); 1025 return(0); 1026 } 1027 else 1028 { 1029 al=SSL_AD_ILLEGAL_PARAMETER; 1030 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE); 1031 goto f_err; 1032 } 1033 1034 goto start; 1035 } 1036 1037 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */ 1038 { 1039 s->rwstate=SSL_NOTHING; 1040 rr->length=0; 1041 return(0); 1042 } 1043 1044 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) 1045 { 1046 struct ccs_header_st ccs_hdr; 1047 unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH; 1048 1049 dtls1_get_ccs_header(rr->data, &ccs_hdr); 1050 1051 /* 'Change Cipher Spec' is just a single byte, so we know 1052 * exactly what the record payload has to look like */ 1053 /* XDTLS: check that epoch is consistent */ 1054 if (s->client_version == DTLS1_BAD_VER || s->version == DTLS1_BAD_VER) 1055 ccs_hdr_len = 3; 1056 1057 if ((rr->length != ccs_hdr_len) || (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS)) 1058 { 1059 i=SSL_AD_ILLEGAL_PARAMETER; 1060 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC); 1061 goto err; 1062 } 1063 1064 rr->length=0; 1065 1066 if (s->msg_callback) 1067 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, 1068 rr->data, 1, s, s->msg_callback_arg); 1069 1070 /* We can't process a CCS now, because previous handshake 1071 * messages are still missing, so just drop it. 1072 */ 1073 if (!s->d1->change_cipher_spec_ok) 1074 { 1075 goto start; 1076 } 1077 1078 s->d1->change_cipher_spec_ok = 0; 1079 1080 s->s3->change_cipher_spec=1; 1081 if (!ssl3_do_change_cipher_spec(s)) 1082 goto err; 1083 1084 /* do this whenever CCS is processed */ 1085 dtls1_reset_seq_numbers(s, SSL3_CC_READ); 1086 1087 if (s->client_version == DTLS1_BAD_VER) 1088 s->d1->handshake_read_seq++; 1089 1090 goto start; 1091 } 1092 1093 /* Unexpected handshake message (Client Hello, or protocol violation) */ 1094 if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && 1095 !s->in_handshake) 1096 { 1097 struct hm_header_st msg_hdr; 1098 1099 /* this may just be a stale retransmit */ 1100 dtls1_get_message_header(rr->data, &msg_hdr); 1101 if( rr->epoch != s->d1->r_epoch) 1102 { 1103 rr->length = 0; 1104 goto start; 1105 } 1106 1107 /* If we are server, we may have a repeated FINISHED of the 1108 * client here, then retransmit our CCS and FINISHED. 1109 */ 1110 if (msg_hdr.type == SSL3_MT_FINISHED) 1111 { 1112 dtls1_retransmit_buffered_messages(s); 1113 rr->length = 0; 1114 goto start; 1115 } 1116 1117 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) && 1118 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) 1119 { 1120#if 0 /* worked only because C operator preferences are not as expected (and 1121 * because this is not really needed for clients except for detecting 1122 * protocol violations): */ 1123 s->state=SSL_ST_BEFORE|(s->server) 1124 ?SSL_ST_ACCEPT 1125 :SSL_ST_CONNECT; 1126#else 1127 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; 1128#endif 1129 s->new_session=1; 1130 } 1131 i=s->handshake_func(s); 1132 if (i < 0) return(i); 1133 if (i == 0) 1134 { 1135 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 1136 return(-1); 1137 } 1138 1139 if (!(s->mode & SSL_MODE_AUTO_RETRY)) 1140 { 1141 if (s->s3->rbuf.left == 0) /* no read-ahead left? */ 1142 { 1143 BIO *bio; 1144 /* In the case where we try to read application data, 1145 * but we trigger an SSL handshake, we return -1 with 1146 * the retry option set. Otherwise renegotiation may 1147 * cause nasty problems in the blocking world */ 1148 s->rwstate=SSL_READING; 1149 bio=SSL_get_rbio(s); 1150 BIO_clear_retry_flags(bio); 1151 BIO_set_retry_read(bio); 1152 return(-1); 1153 } 1154 } 1155 goto start; 1156 } 1157 1158 switch (rr->type) 1159 { 1160 default: 1161#ifndef OPENSSL_NO_TLS 1162 /* TLS just ignores unknown message types */ 1163 if (s->version == TLS1_VERSION) 1164 { 1165 rr->length = 0; 1166 goto start; 1167 } 1168#endif 1169 al=SSL_AD_UNEXPECTED_MESSAGE; 1170 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); 1171 goto f_err; 1172 case SSL3_RT_CHANGE_CIPHER_SPEC: 1173 case SSL3_RT_ALERT: 1174 case SSL3_RT_HANDSHAKE: 1175 /* we already handled all of these, with the possible exception 1176 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that 1177 * should not happen when type != rr->type */ 1178 al=SSL_AD_UNEXPECTED_MESSAGE; 1179 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR); 1180 goto f_err; 1181 case SSL3_RT_APPLICATION_DATA: 1182 /* At this point, we were expecting handshake data, 1183 * but have application data. If the library was 1184 * running inside ssl3_read() (i.e. in_read_app_data 1185 * is set) and it makes sense to read application data 1186 * at this point (session renegotiation not yet started), 1187 * we will indulge it. 1188 */ 1189 if (s->s3->in_read_app_data && 1190 (s->s3->total_renegotiations != 0) && 1191 (( 1192 (s->state & SSL_ST_CONNECT) && 1193 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && 1194 (s->state <= SSL3_ST_CR_SRVR_HELLO_A) 1195 ) || ( 1196 (s->state & SSL_ST_ACCEPT) && 1197 (s->state <= SSL3_ST_SW_HELLO_REQ_A) && 1198 (s->state >= SSL3_ST_SR_CLNT_HELLO_A) 1199 ) 1200 )) 1201 { 1202 s->s3->in_read_app_data=2; 1203 return(-1); 1204 } 1205 else 1206 { 1207 al=SSL_AD_UNEXPECTED_MESSAGE; 1208 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); 1209 goto f_err; 1210 } 1211 } 1212 /* not reached */ 1213 1214f_err: 1215 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1216err: 1217 return(-1); 1218 } 1219 1220int 1221dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len) 1222 { 1223 int i; 1224 1225 if (SSL_in_init(s) && !s->in_handshake) 1226 { 1227 i=s->handshake_func(s); 1228 if (i < 0) return(i); 1229 if (i == 0) 1230 { 1231 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 1232 return -1; 1233 } 1234 } 1235 1236 if (len > SSL3_RT_MAX_PLAIN_LENGTH) 1237 { 1238 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG); 1239 return -1; 1240 } 1241 1242 i = dtls1_write_bytes(s, type, buf_, len); 1243 return i; 1244 } 1245 1246 1247 /* this only happens when a client hello is received and a handshake 1248 * is started. */ 1249static int 1250have_handshake_fragment(SSL *s, int type, unsigned char *buf, 1251 int len, int peek) 1252 { 1253 1254 if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0)) 1255 /* (partially) satisfy request from storage */ 1256 { 1257 unsigned char *src = s->d1->handshake_fragment; 1258 unsigned char *dst = buf; 1259 unsigned int k,n; 1260 1261 /* peek == 0 */ 1262 n = 0; 1263 while ((len > 0) && (s->d1->handshake_fragment_len > 0)) 1264 { 1265 *dst++ = *src++; 1266 len--; s->d1->handshake_fragment_len--; 1267 n++; 1268 } 1269 /* move any remaining fragment bytes: */ 1270 for (k = 0; k < s->d1->handshake_fragment_len; k++) 1271 s->d1->handshake_fragment[k] = *src++; 1272 return n; 1273 } 1274 1275 return 0; 1276 } 1277 1278 1279 1280 1281/* Call this to write data in records of type 'type' 1282 * It will return <= 0 if not all data has been sent or non-blocking IO. 1283 */ 1284int dtls1_write_bytes(SSL *s, int type, const void *buf, int len) 1285 { 1286 int i; 1287 1288 OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH); 1289 s->rwstate=SSL_NOTHING; 1290 i=do_dtls1_write(s, type, buf, len, 0); 1291 return i; 1292 } 1293 1294int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment) 1295 { 1296 unsigned char *p,*pseq; 1297 int i,mac_size,clear=0; 1298 int prefix_len = 0; 1299 SSL3_RECORD *wr; 1300 SSL3_BUFFER *wb; 1301 SSL_SESSION *sess; 1302 int bs; 1303 1304 /* first check if there is a SSL3_BUFFER still being written 1305 * out. This will happen with non blocking IO */ 1306 if (s->s3->wbuf.left != 0) 1307 { 1308 OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */ 1309 return(ssl3_write_pending(s,type,buf,len)); 1310 } 1311 1312 /* If we have an alert to send, lets send it */ 1313 if (s->s3->alert_dispatch) 1314 { 1315 i=s->method->ssl_dispatch_alert(s); 1316 if (i <= 0) 1317 return(i); 1318 /* if it went, fall through and send more stuff */ 1319 } 1320 1321 if (len == 0 && !create_empty_fragment) 1322 return 0; 1323 1324 wr= &(s->s3->wrec); 1325 wb= &(s->s3->wbuf); 1326 sess=s->session; 1327 1328 if ( (sess == NULL) || 1329 (s->enc_write_ctx == NULL) || 1330 (s->write_hash == NULL)) 1331 clear=1; 1332 1333 if (clear) 1334 mac_size=0; 1335 else 1336 mac_size=EVP_MD_size(s->write_hash); 1337 1338 /* DTLS implements explicit IV, so no need for empty fragments */ 1339#if 0 1340 /* 'create_empty_fragment' is true only when this function calls itself */ 1341 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done 1342 && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER) 1343 { 1344 /* countermeasure against known-IV weakness in CBC ciphersuites 1345 * (see http://www.openssl.org/~bodo/tls-cbc.txt) 1346 */ 1347 1348 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) 1349 { 1350 /* recursive function call with 'create_empty_fragment' set; 1351 * this prepares and buffers the data for an empty fragment 1352 * (these 'prefix_len' bytes are sent out later 1353 * together with the actual payload) */ 1354 prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1); 1355 if (prefix_len <= 0) 1356 goto err; 1357 1358 if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE) 1359 { 1360 /* insufficient space */ 1361 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR); 1362 goto err; 1363 } 1364 } 1365 1366 s->s3->empty_fragment_done = 1; 1367 } 1368#endif 1369 1370 p = wb->buf + prefix_len; 1371 1372 /* write the header */ 1373 1374 *(p++)=type&0xff; 1375 wr->type=type; 1376 1377 if (s->client_version == DTLS1_BAD_VER) 1378 *(p++) = DTLS1_BAD_VER>>8, 1379 *(p++) = DTLS1_BAD_VER&0xff; 1380 else 1381 *(p++)=(s->version>>8), 1382 *(p++)=s->version&0xff; 1383 1384 /* field where we are to write out packet epoch, seq num and len */ 1385 pseq=p; 1386 p+=10; 1387 1388 /* lets setup the record stuff. */ 1389 1390 /* Make space for the explicit IV in case of CBC. 1391 * (this is a bit of a boundary violation, but what the heck). 1392 */ 1393 if ( s->enc_write_ctx && 1394 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE)) 1395 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher); 1396 else 1397 bs = 0; 1398 1399 wr->data=p + bs; /* make room for IV in case of CBC */ 1400 wr->length=(int)len; 1401 wr->input=(unsigned char *)buf; 1402 1403 /* we now 'read' from wr->input, wr->length bytes into 1404 * wr->data */ 1405 1406 /* first we compress */ 1407 if (s->compress != NULL) 1408 { 1409 if (!ssl3_do_compress(s)) 1410 { 1411 SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE); 1412 goto err; 1413 } 1414 } 1415 else 1416 { 1417 memcpy(wr->data,wr->input,wr->length); 1418 wr->input=wr->data; 1419 } 1420 1421 /* we should still have the output to wr->data and the input 1422 * from wr->input. Length should be wr->length. 1423 * wr->data still points in the wb->buf */ 1424 1425 if (mac_size != 0) 1426 { 1427 s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1); 1428 wr->length+=mac_size; 1429 } 1430 1431 /* this is true regardless of mac size */ 1432 wr->input=p; 1433 wr->data=p; 1434 1435 1436 /* ssl3_enc can only have an error on read */ 1437 if (bs) /* bs != 0 in case of CBC */ 1438 { 1439 RAND_pseudo_bytes(p,bs); 1440 /* master IV and last CBC residue stand for 1441 * the rest of randomness */ 1442 wr->length += bs; 1443 } 1444 1445 s->method->ssl3_enc->enc(s,1); 1446 1447 /* record length after mac and block padding */ 1448/* if (type == SSL3_RT_APPLICATION_DATA || 1449 (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */ 1450 1451 /* there's only one epoch between handshake and app data */ 1452 1453 s2n(s->d1->w_epoch, pseq); 1454 1455 /* XDTLS: ?? */ 1456/* else 1457 s2n(s->d1->handshake_epoch, pseq); */ 1458 1459 memcpy(pseq, &(s->s3->write_sequence[2]), 6); 1460 pseq+=6; 1461 s2n(wr->length,pseq); 1462 1463 /* we should now have 1464 * wr->data pointing to the encrypted data, which is 1465 * wr->length long */ 1466 wr->type=type; /* not needed but helps for debugging */ 1467 wr->length+=DTLS1_RT_HEADER_LENGTH; 1468 1469#if 0 /* this is now done at the message layer */ 1470 /* buffer the record, making it easy to handle retransmits */ 1471 if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC) 1472 dtls1_buffer_record(s, wr->data, wr->length, 1473 *((PQ_64BIT *)&(s->s3->write_sequence[0]))); 1474#endif 1475 1476 ssl3_record_sequence_update(&(s->s3->write_sequence[0])); 1477 1478 if (create_empty_fragment) 1479 { 1480 /* we are in a recursive call; 1481 * just return the length, don't write out anything here 1482 */ 1483 return wr->length; 1484 } 1485 1486 /* now let's set up wb */ 1487 wb->left = prefix_len + wr->length; 1488 wb->offset = 0; 1489 1490 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */ 1491 s->s3->wpend_tot=len; 1492 s->s3->wpend_buf=buf; 1493 s->s3->wpend_type=type; 1494 s->s3->wpend_ret=len; 1495 1496 /* we now just need to write the buffer */ 1497 return ssl3_write_pending(s,type,buf,len); 1498err: 1499 return -1; 1500 } 1501 1502 1503 1504static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap, 1505 PQ_64BIT *seq_num) 1506 { 1507#if PQ_64BIT_IS_INTEGER 1508 PQ_64BIT mask = 0x0000000000000001L; 1509#endif 1510 PQ_64BIT rcd_num, tmp; 1511 1512 pq_64bit_init(&rcd_num); 1513 pq_64bit_init(&tmp); 1514 1515 /* this is the sequence number for the record just read */ 1516 pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8); 1517 1518 1519 if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) || 1520 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num))) 1521 { 1522 pq_64bit_assign(seq_num, &rcd_num); 1523 pq_64bit_free(&rcd_num); 1524 pq_64bit_free(&tmp); 1525 return 1; /* this record is new */ 1526 } 1527 1528 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); 1529 1530 if ( pq_64bit_get_word(&tmp) > bitmap->length) 1531 { 1532 pq_64bit_free(&rcd_num); 1533 pq_64bit_free(&tmp); 1534 return 0; /* stale, outside the window */ 1535 } 1536 1537#if PQ_64BIT_IS_BIGNUM 1538 { 1539 int offset; 1540 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); 1541 pq_64bit_sub_word(&tmp, 1); 1542 offset = pq_64bit_get_word(&tmp); 1543 if ( pq_64bit_is_bit_set(&(bitmap->map), offset)) 1544 { 1545 pq_64bit_free(&rcd_num); 1546 pq_64bit_free(&tmp); 1547 return 0; 1548 } 1549 } 1550#else 1551 mask <<= (bitmap->max_seq_num - rcd_num - 1); 1552 if (bitmap->map & mask) 1553 return 0; /* record previously received */ 1554#endif 1555 1556 pq_64bit_assign(seq_num, &rcd_num); 1557 pq_64bit_free(&rcd_num); 1558 pq_64bit_free(&tmp); 1559 return 1; 1560 } 1561 1562 1563static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap) 1564 { 1565 unsigned int shift; 1566 PQ_64BIT rcd_num; 1567 PQ_64BIT tmp; 1568 PQ_64BIT_CTX *ctx; 1569 1570 pq_64bit_init(&rcd_num); 1571 pq_64bit_init(&tmp); 1572 1573 pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8); 1574 1575 /* unfortunate code complexity due to 64-bit manipulation support 1576 * on 32-bit machines */ 1577 if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) || 1578 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num))) 1579 { 1580 pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num)); 1581 pq_64bit_add_word(&tmp, 1); 1582 1583 shift = (unsigned int)pq_64bit_get_word(&tmp); 1584 1585 pq_64bit_lshift(&(tmp), &(bitmap->map), shift); 1586 pq_64bit_assign(&(bitmap->map), &tmp); 1587 1588 pq_64bit_set_bit(&(bitmap->map), 0); 1589 pq_64bit_add_word(&rcd_num, 1); 1590 pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num); 1591 1592 pq_64bit_assign_word(&tmp, 1); 1593 pq_64bit_lshift(&tmp, &tmp, bitmap->length); 1594 ctx = pq_64bit_ctx_new(&ctx); 1595 pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx); 1596 pq_64bit_ctx_free(ctx); 1597 } 1598 else 1599 { 1600 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); 1601 pq_64bit_sub_word(&tmp, 1); 1602 shift = (unsigned int)pq_64bit_get_word(&tmp); 1603 1604 pq_64bit_set_bit(&(bitmap->map), shift); 1605 } 1606 1607 pq_64bit_free(&rcd_num); 1608 pq_64bit_free(&tmp); 1609 } 1610 1611 1612int dtls1_dispatch_alert(SSL *s) 1613 { 1614 int i,j; 1615 void (*cb)(const SSL *ssl,int type,int val)=NULL; 1616 unsigned char buf[DTLS1_AL_HEADER_LENGTH]; 1617 unsigned char *ptr = &buf[0]; 1618 1619 s->s3->alert_dispatch=0; 1620 1621 memset(buf, 0x00, sizeof(buf)); 1622 *ptr++ = s->s3->send_alert[0]; 1623 *ptr++ = s->s3->send_alert[1]; 1624 1625#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 1626 if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) 1627 { 1628 s2n(s->d1->handshake_read_seq, ptr); 1629#if 0 1630 if ( s->d1->r_msg_hdr.frag_off == 0) /* waiting for a new msg */ 1631 1632 else 1633 s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */ 1634#endif 1635 1636#if 0 1637 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); 1638#endif 1639 l2n3(s->d1->r_msg_hdr.frag_off, ptr); 1640 } 1641#endif 1642 1643 i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0); 1644 if (i <= 0) 1645 { 1646 s->s3->alert_dispatch=1; 1647 /* fprintf( stderr, "not done with alert\n" ); */ 1648 } 1649 else 1650 { 1651 if (s->s3->send_alert[0] == SSL3_AL_FATAL 1652#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 1653 || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 1654#endif 1655 ) 1656 (void)BIO_flush(s->wbio); 1657 1658 if (s->msg_callback) 1659 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 1660 2, s, s->msg_callback_arg); 1661 1662 if (s->info_callback != NULL) 1663 cb=s->info_callback; 1664 else if (s->ctx->info_callback != NULL) 1665 cb=s->ctx->info_callback; 1666 1667 if (cb != NULL) 1668 { 1669 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1]; 1670 cb(s,SSL_CB_WRITE_ALERT,j); 1671 } 1672 } 1673 return(i); 1674 } 1675 1676 1677static DTLS1_BITMAP * 1678dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch) 1679 { 1680 1681 *is_next_epoch = 0; 1682 1683 /* In current epoch, accept HM, CCS, DATA, & ALERT */ 1684 if (rr->epoch == s->d1->r_epoch) 1685 return &s->d1->bitmap; 1686 1687 /* Only HM and ALERT messages can be from the next epoch */ 1688 else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) && 1689 (rr->type == SSL3_RT_HANDSHAKE || 1690 rr->type == SSL3_RT_ALERT)) 1691 { 1692 *is_next_epoch = 1; 1693 return &s->d1->next_bitmap; 1694 } 1695 1696 return NULL; 1697 } 1698 1699#if 0 1700static int 1701dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority, 1702 unsigned long *offset) 1703 { 1704 1705 /* alerts are passed up immediately */ 1706 if ( rr->type == SSL3_RT_APPLICATION_DATA || 1707 rr->type == SSL3_RT_ALERT) 1708 return 0; 1709 1710 /* Only need to buffer if a handshake is underway. 1711 * (this implies that Hello Request and Client Hello are passed up 1712 * immediately) */ 1713 if ( SSL_in_init(s)) 1714 { 1715 unsigned char *data = rr->data; 1716 /* need to extract the HM/CCS sequence number here */ 1717 if ( rr->type == SSL3_RT_HANDSHAKE || 1718 rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) 1719 { 1720 unsigned short seq_num; 1721 struct hm_header_st msg_hdr; 1722 struct ccs_header_st ccs_hdr; 1723 1724 if ( rr->type == SSL3_RT_HANDSHAKE) 1725 { 1726 dtls1_get_message_header(data, &msg_hdr); 1727 seq_num = msg_hdr.seq; 1728 *offset = msg_hdr.frag_off; 1729 } 1730 else 1731 { 1732 dtls1_get_ccs_header(data, &ccs_hdr); 1733 seq_num = ccs_hdr.seq; 1734 *offset = 0; 1735 } 1736 1737 /* this is either a record we're waiting for, or a 1738 * retransmit of something we happened to previously 1739 * receive (higher layers will drop the repeat silently */ 1740 if ( seq_num < s->d1->handshake_read_seq) 1741 return 0; 1742 if (rr->type == SSL3_RT_HANDSHAKE && 1743 seq_num == s->d1->handshake_read_seq && 1744 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off) 1745 return 0; 1746 else if ( seq_num == s->d1->handshake_read_seq && 1747 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC || 1748 msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off)) 1749 return 0; 1750 else 1751 { 1752 *priority = seq_num; 1753 return 1; 1754 } 1755 } 1756 else /* unknown record type */ 1757 return 0; 1758 } 1759 1760 return 0; 1761 } 1762#endif 1763 1764void 1765dtls1_reset_seq_numbers(SSL *s, int rw) 1766 { 1767 unsigned char *seq; 1768 unsigned int seq_bytes = sizeof(s->s3->read_sequence); 1769 1770 if ( rw & SSL3_CC_READ) 1771 { 1772 seq = s->s3->read_sequence; 1773 s->d1->r_epoch++; 1774 1775 pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map)); 1776 s->d1->bitmap.length = s->d1->next_bitmap.length; 1777 pq_64bit_assign(&(s->d1->bitmap.max_seq_num), 1778 &(s->d1->next_bitmap.max_seq_num)); 1779 1780 pq_64bit_free(&(s->d1->next_bitmap.map)); 1781 pq_64bit_free(&(s->d1->next_bitmap.max_seq_num)); 1782 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP)); 1783 pq_64bit_init(&(s->d1->next_bitmap.map)); 1784 pq_64bit_init(&(s->d1->next_bitmap.max_seq_num)); 1785 } 1786 else 1787 { 1788 seq = s->s3->write_sequence; 1789 memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence)); 1790 s->d1->w_epoch++; 1791 } 1792 1793 memset(seq, 0x00, seq_bytes); 1794 } 1795 1796#if PQ_64BIT_IS_INTEGER 1797static PQ_64BIT 1798bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num) 1799 { 1800 PQ_64BIT _num; 1801 1802 _num = (((PQ_64BIT)bytes[0]) << 56) | 1803 (((PQ_64BIT)bytes[1]) << 48) | 1804 (((PQ_64BIT)bytes[2]) << 40) | 1805 (((PQ_64BIT)bytes[3]) << 32) | 1806 (((PQ_64BIT)bytes[4]) << 24) | 1807 (((PQ_64BIT)bytes[5]) << 16) | 1808 (((PQ_64BIT)bytes[6]) << 8) | 1809 (((PQ_64BIT)bytes[7]) ); 1810 1811 *num = _num ; 1812 return _num; 1813 } 1814#endif 1815 1816 1817static void 1818dtls1_clear_timeouts(SSL *s) 1819 { 1820 memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st)); 1821 }
| 764 rr->length = 0; 765 goto start; 766 } 767 768 /* If the other end has shut down, throw anything we read away 769 * (even in 'peek' mode) */ 770 if (s->shutdown & SSL_RECEIVED_SHUTDOWN) 771 { 772 rr->length=0; 773 s->rwstate=SSL_NOTHING; 774 return(0); 775 } 776 777 778 if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */ 779 { 780 /* make sure that we are not getting application data when we 781 * are doing a handshake for the first time */ 782 if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && 783 (s->enc_read_ctx == NULL)) 784 { 785 al=SSL_AD_UNEXPECTED_MESSAGE; 786 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE); 787 goto f_err; 788 } 789 790 if (len <= 0) return(len); 791 792 if ((unsigned int)len > rr->length) 793 n = rr->length; 794 else 795 n = (unsigned int)len; 796 797 memcpy(buf,&(rr->data[rr->off]),n); 798 if (!peek) 799 { 800 rr->length-=n; 801 rr->off+=n; 802 if (rr->length == 0) 803 { 804 s->rstate=SSL_ST_READ_HEADER; 805 rr->off=0; 806 } 807 } 808 return(n); 809 } 810 811 812 /* If we get here, then type != rr->type; if we have a handshake 813 * message, then it was unexpected (Hello Request or Client Hello). */ 814 815 /* In case of record types for which we have 'fragment' storage, 816 * fill that so that we can process the data at a fixed place. 817 */ 818 { 819 unsigned int k, dest_maxlen = 0; 820 unsigned char *dest = NULL; 821 unsigned int *dest_len = NULL; 822 823 if (rr->type == SSL3_RT_HANDSHAKE) 824 { 825 dest_maxlen = sizeof s->d1->handshake_fragment; 826 dest = s->d1->handshake_fragment; 827 dest_len = &s->d1->handshake_fragment_len; 828 } 829 else if (rr->type == SSL3_RT_ALERT) 830 { 831 dest_maxlen = sizeof(s->d1->alert_fragment); 832 dest = s->d1->alert_fragment; 833 dest_len = &s->d1->alert_fragment_len; 834 } 835 /* else it's a CCS message, or application data or wrong */ 836 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC) 837 { 838 /* Application data while renegotiating 839 * is allowed. Try again reading. 840 */ 841 if (rr->type == SSL3_RT_APPLICATION_DATA) 842 { 843 BIO *bio; 844 s->s3->in_read_app_data=2; 845 bio=SSL_get_rbio(s); 846 s->rwstate=SSL_READING; 847 BIO_clear_retry_flags(bio); 848 BIO_set_retry_read(bio); 849 return(-1); 850 } 851 852 /* Not certain if this is the right error handling */ 853 al=SSL_AD_UNEXPECTED_MESSAGE; 854 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); 855 goto f_err; 856 } 857 858 if (dest_maxlen > 0) 859 { 860 /* XDTLS: In a pathalogical case, the Client Hello 861 * may be fragmented--don't always expect dest_maxlen bytes */ 862 if ( rr->length < dest_maxlen) 863 { 864#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 865 /* 866 * for normal alerts rr->length is 2, while 867 * dest_maxlen is 7 if we were to handle this 868 * non-existing alert... 869 */ 870 FIX ME 871#endif 872 s->rstate=SSL_ST_READ_HEADER; 873 rr->length = 0; 874 goto start; 875 } 876 877 /* now move 'n' bytes: */ 878 for ( k = 0; k < dest_maxlen; k++) 879 { 880 dest[k] = rr->data[rr->off++]; 881 rr->length--; 882 } 883 *dest_len = dest_maxlen; 884 } 885 } 886 887 /* s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE; 888 * s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT. 889 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */ 890 891 /* If we are a client, check for an incoming 'Hello Request': */ 892 if ((!s->server) && 893 (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && 894 (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && 895 (s->session != NULL) && (s->session->cipher != NULL)) 896 { 897 s->d1->handshake_fragment_len = 0; 898 899 if ((s->d1->handshake_fragment[1] != 0) || 900 (s->d1->handshake_fragment[2] != 0) || 901 (s->d1->handshake_fragment[3] != 0)) 902 { 903 al=SSL_AD_DECODE_ERROR; 904 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST); 905 goto err; 906 } 907 908 /* no need to check sequence number on HELLO REQUEST messages */ 909 910 if (s->msg_callback) 911 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, 912 s->d1->handshake_fragment, 4, s, s->msg_callback_arg); 913 914 if (SSL_is_init_finished(s) && 915 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && 916 !s->s3->renegotiate) 917 { 918 ssl3_renegotiate(s); 919 if (ssl3_renegotiate_check(s)) 920 { 921 i=s->handshake_func(s); 922 if (i < 0) return(i); 923 if (i == 0) 924 { 925 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 926 return(-1); 927 } 928 929 if (!(s->mode & SSL_MODE_AUTO_RETRY)) 930 { 931 if (s->s3->rbuf.left == 0) /* no read-ahead left? */ 932 { 933 BIO *bio; 934 /* In the case where we try to read application data, 935 * but we trigger an SSL handshake, we return -1 with 936 * the retry option set. Otherwise renegotiation may 937 * cause nasty problems in the blocking world */ 938 s->rwstate=SSL_READING; 939 bio=SSL_get_rbio(s); 940 BIO_clear_retry_flags(bio); 941 BIO_set_retry_read(bio); 942 return(-1); 943 } 944 } 945 } 946 } 947 /* we either finished a handshake or ignored the request, 948 * now try again to obtain the (application) data we were asked for */ 949 goto start; 950 } 951 952 if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) 953 { 954 int alert_level = s->d1->alert_fragment[0]; 955 int alert_descr = s->d1->alert_fragment[1]; 956 957 s->d1->alert_fragment_len = 0; 958 959 if (s->msg_callback) 960 s->msg_callback(0, s->version, SSL3_RT_ALERT, 961 s->d1->alert_fragment, 2, s, s->msg_callback_arg); 962 963 if (s->info_callback != NULL) 964 cb=s->info_callback; 965 else if (s->ctx->info_callback != NULL) 966 cb=s->ctx->info_callback; 967 968 if (cb != NULL) 969 { 970 j = (alert_level << 8) | alert_descr; 971 cb(s, SSL_CB_READ_ALERT, j); 972 } 973 974 if (alert_level == 1) /* warning */ 975 { 976 s->s3->warn_alert = alert_descr; 977 if (alert_descr == SSL_AD_CLOSE_NOTIFY) 978 { 979 s->shutdown |= SSL_RECEIVED_SHUTDOWN; 980 return(0); 981 } 982#if 0 983 /* XXX: this is a possible improvement in the future */ 984 /* now check if it's a missing record */ 985 if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) 986 { 987 unsigned short seq; 988 unsigned int frag_off; 989 unsigned char *p = &(s->d1->alert_fragment[2]); 990 991 n2s(p, seq); 992 n2l3(p, frag_off); 993 994 dtls1_retransmit_message(s, 995 dtls1_get_queue_priority(frag->msg_header.seq, 0), 996 frag_off, &found); 997 if ( ! found && SSL_in_init(s)) 998 { 999 /* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */ 1000 /* requested a message not yet sent, 1001 send an alert ourselves */ 1002 ssl3_send_alert(s,SSL3_AL_WARNING, 1003 DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); 1004 } 1005 } 1006#endif 1007 } 1008 else if (alert_level == 2) /* fatal */ 1009 { 1010 char tmp[16]; 1011 1012 s->rwstate=SSL_NOTHING; 1013 s->s3->fatal_alert = alert_descr; 1014 SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); 1015 BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr); 1016 ERR_add_error_data(2,"SSL alert number ",tmp); 1017 s->shutdown|=SSL_RECEIVED_SHUTDOWN; 1018 SSL_CTX_remove_session(s->ctx,s->session); 1019 return(0); 1020 } 1021 else 1022 { 1023 al=SSL_AD_ILLEGAL_PARAMETER; 1024 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE); 1025 goto f_err; 1026 } 1027 1028 goto start; 1029 } 1030 1031 if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */ 1032 { 1033 s->rwstate=SSL_NOTHING; 1034 rr->length=0; 1035 return(0); 1036 } 1037 1038 if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) 1039 { 1040 struct ccs_header_st ccs_hdr; 1041 unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH; 1042 1043 dtls1_get_ccs_header(rr->data, &ccs_hdr); 1044 1045 /* 'Change Cipher Spec' is just a single byte, so we know 1046 * exactly what the record payload has to look like */ 1047 /* XDTLS: check that epoch is consistent */ 1048 if (s->client_version == DTLS1_BAD_VER || s->version == DTLS1_BAD_VER) 1049 ccs_hdr_len = 3; 1050 1051 if ((rr->length != ccs_hdr_len) || (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS)) 1052 { 1053 i=SSL_AD_ILLEGAL_PARAMETER; 1054 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC); 1055 goto err; 1056 } 1057 1058 rr->length=0; 1059 1060 if (s->msg_callback) 1061 s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, 1062 rr->data, 1, s, s->msg_callback_arg); 1063 1064 /* We can't process a CCS now, because previous handshake 1065 * messages are still missing, so just drop it. 1066 */ 1067 if (!s->d1->change_cipher_spec_ok) 1068 { 1069 goto start; 1070 } 1071 1072 s->d1->change_cipher_spec_ok = 0; 1073 1074 s->s3->change_cipher_spec=1; 1075 if (!ssl3_do_change_cipher_spec(s)) 1076 goto err; 1077 1078 /* do this whenever CCS is processed */ 1079 dtls1_reset_seq_numbers(s, SSL3_CC_READ); 1080 1081 if (s->client_version == DTLS1_BAD_VER) 1082 s->d1->handshake_read_seq++; 1083 1084 goto start; 1085 } 1086 1087 /* Unexpected handshake message (Client Hello, or protocol violation) */ 1088 if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && 1089 !s->in_handshake) 1090 { 1091 struct hm_header_st msg_hdr; 1092 1093 /* this may just be a stale retransmit */ 1094 dtls1_get_message_header(rr->data, &msg_hdr); 1095 if( rr->epoch != s->d1->r_epoch) 1096 { 1097 rr->length = 0; 1098 goto start; 1099 } 1100 1101 /* If we are server, we may have a repeated FINISHED of the 1102 * client here, then retransmit our CCS and FINISHED. 1103 */ 1104 if (msg_hdr.type == SSL3_MT_FINISHED) 1105 { 1106 dtls1_retransmit_buffered_messages(s); 1107 rr->length = 0; 1108 goto start; 1109 } 1110 1111 if (((s->state&SSL_ST_MASK) == SSL_ST_OK) && 1112 !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) 1113 { 1114#if 0 /* worked only because C operator preferences are not as expected (and 1115 * because this is not really needed for clients except for detecting 1116 * protocol violations): */ 1117 s->state=SSL_ST_BEFORE|(s->server) 1118 ?SSL_ST_ACCEPT 1119 :SSL_ST_CONNECT; 1120#else 1121 s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; 1122#endif 1123 s->new_session=1; 1124 } 1125 i=s->handshake_func(s); 1126 if (i < 0) return(i); 1127 if (i == 0) 1128 { 1129 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 1130 return(-1); 1131 } 1132 1133 if (!(s->mode & SSL_MODE_AUTO_RETRY)) 1134 { 1135 if (s->s3->rbuf.left == 0) /* no read-ahead left? */ 1136 { 1137 BIO *bio; 1138 /* In the case where we try to read application data, 1139 * but we trigger an SSL handshake, we return -1 with 1140 * the retry option set. Otherwise renegotiation may 1141 * cause nasty problems in the blocking world */ 1142 s->rwstate=SSL_READING; 1143 bio=SSL_get_rbio(s); 1144 BIO_clear_retry_flags(bio); 1145 BIO_set_retry_read(bio); 1146 return(-1); 1147 } 1148 } 1149 goto start; 1150 } 1151 1152 switch (rr->type) 1153 { 1154 default: 1155#ifndef OPENSSL_NO_TLS 1156 /* TLS just ignores unknown message types */ 1157 if (s->version == TLS1_VERSION) 1158 { 1159 rr->length = 0; 1160 goto start; 1161 } 1162#endif 1163 al=SSL_AD_UNEXPECTED_MESSAGE; 1164 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); 1165 goto f_err; 1166 case SSL3_RT_CHANGE_CIPHER_SPEC: 1167 case SSL3_RT_ALERT: 1168 case SSL3_RT_HANDSHAKE: 1169 /* we already handled all of these, with the possible exception 1170 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that 1171 * should not happen when type != rr->type */ 1172 al=SSL_AD_UNEXPECTED_MESSAGE; 1173 SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR); 1174 goto f_err; 1175 case SSL3_RT_APPLICATION_DATA: 1176 /* At this point, we were expecting handshake data, 1177 * but have application data. If the library was 1178 * running inside ssl3_read() (i.e. in_read_app_data 1179 * is set) and it makes sense to read application data 1180 * at this point (session renegotiation not yet started), 1181 * we will indulge it. 1182 */ 1183 if (s->s3->in_read_app_data && 1184 (s->s3->total_renegotiations != 0) && 1185 (( 1186 (s->state & SSL_ST_CONNECT) && 1187 (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && 1188 (s->state <= SSL3_ST_CR_SRVR_HELLO_A) 1189 ) || ( 1190 (s->state & SSL_ST_ACCEPT) && 1191 (s->state <= SSL3_ST_SW_HELLO_REQ_A) && 1192 (s->state >= SSL3_ST_SR_CLNT_HELLO_A) 1193 ) 1194 )) 1195 { 1196 s->s3->in_read_app_data=2; 1197 return(-1); 1198 } 1199 else 1200 { 1201 al=SSL_AD_UNEXPECTED_MESSAGE; 1202 SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD); 1203 goto f_err; 1204 } 1205 } 1206 /* not reached */ 1207 1208f_err: 1209 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1210err: 1211 return(-1); 1212 } 1213 1214int 1215dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len) 1216 { 1217 int i; 1218 1219 if (SSL_in_init(s) && !s->in_handshake) 1220 { 1221 i=s->handshake_func(s); 1222 if (i < 0) return(i); 1223 if (i == 0) 1224 { 1225 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); 1226 return -1; 1227 } 1228 } 1229 1230 if (len > SSL3_RT_MAX_PLAIN_LENGTH) 1231 { 1232 SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG); 1233 return -1; 1234 } 1235 1236 i = dtls1_write_bytes(s, type, buf_, len); 1237 return i; 1238 } 1239 1240 1241 /* this only happens when a client hello is received and a handshake 1242 * is started. */ 1243static int 1244have_handshake_fragment(SSL *s, int type, unsigned char *buf, 1245 int len, int peek) 1246 { 1247 1248 if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0)) 1249 /* (partially) satisfy request from storage */ 1250 { 1251 unsigned char *src = s->d1->handshake_fragment; 1252 unsigned char *dst = buf; 1253 unsigned int k,n; 1254 1255 /* peek == 0 */ 1256 n = 0; 1257 while ((len > 0) && (s->d1->handshake_fragment_len > 0)) 1258 { 1259 *dst++ = *src++; 1260 len--; s->d1->handshake_fragment_len--; 1261 n++; 1262 } 1263 /* move any remaining fragment bytes: */ 1264 for (k = 0; k < s->d1->handshake_fragment_len; k++) 1265 s->d1->handshake_fragment[k] = *src++; 1266 return n; 1267 } 1268 1269 return 0; 1270 } 1271 1272 1273 1274 1275/* Call this to write data in records of type 'type' 1276 * It will return <= 0 if not all data has been sent or non-blocking IO. 1277 */ 1278int dtls1_write_bytes(SSL *s, int type, const void *buf, int len) 1279 { 1280 int i; 1281 1282 OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH); 1283 s->rwstate=SSL_NOTHING; 1284 i=do_dtls1_write(s, type, buf, len, 0); 1285 return i; 1286 } 1287 1288int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment) 1289 { 1290 unsigned char *p,*pseq; 1291 int i,mac_size,clear=0; 1292 int prefix_len = 0; 1293 SSL3_RECORD *wr; 1294 SSL3_BUFFER *wb; 1295 SSL_SESSION *sess; 1296 int bs; 1297 1298 /* first check if there is a SSL3_BUFFER still being written 1299 * out. This will happen with non blocking IO */ 1300 if (s->s3->wbuf.left != 0) 1301 { 1302 OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */ 1303 return(ssl3_write_pending(s,type,buf,len)); 1304 } 1305 1306 /* If we have an alert to send, lets send it */ 1307 if (s->s3->alert_dispatch) 1308 { 1309 i=s->method->ssl_dispatch_alert(s); 1310 if (i <= 0) 1311 return(i); 1312 /* if it went, fall through and send more stuff */ 1313 } 1314 1315 if (len == 0 && !create_empty_fragment) 1316 return 0; 1317 1318 wr= &(s->s3->wrec); 1319 wb= &(s->s3->wbuf); 1320 sess=s->session; 1321 1322 if ( (sess == NULL) || 1323 (s->enc_write_ctx == NULL) || 1324 (s->write_hash == NULL)) 1325 clear=1; 1326 1327 if (clear) 1328 mac_size=0; 1329 else 1330 mac_size=EVP_MD_size(s->write_hash); 1331 1332 /* DTLS implements explicit IV, so no need for empty fragments */ 1333#if 0 1334 /* 'create_empty_fragment' is true only when this function calls itself */ 1335 if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done 1336 && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER) 1337 { 1338 /* countermeasure against known-IV weakness in CBC ciphersuites 1339 * (see http://www.openssl.org/~bodo/tls-cbc.txt) 1340 */ 1341 1342 if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) 1343 { 1344 /* recursive function call with 'create_empty_fragment' set; 1345 * this prepares and buffers the data for an empty fragment 1346 * (these 'prefix_len' bytes are sent out later 1347 * together with the actual payload) */ 1348 prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1); 1349 if (prefix_len <= 0) 1350 goto err; 1351 1352 if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE) 1353 { 1354 /* insufficient space */ 1355 SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR); 1356 goto err; 1357 } 1358 } 1359 1360 s->s3->empty_fragment_done = 1; 1361 } 1362#endif 1363 1364 p = wb->buf + prefix_len; 1365 1366 /* write the header */ 1367 1368 *(p++)=type&0xff; 1369 wr->type=type; 1370 1371 if (s->client_version == DTLS1_BAD_VER) 1372 *(p++) = DTLS1_BAD_VER>>8, 1373 *(p++) = DTLS1_BAD_VER&0xff; 1374 else 1375 *(p++)=(s->version>>8), 1376 *(p++)=s->version&0xff; 1377 1378 /* field where we are to write out packet epoch, seq num and len */ 1379 pseq=p; 1380 p+=10; 1381 1382 /* lets setup the record stuff. */ 1383 1384 /* Make space for the explicit IV in case of CBC. 1385 * (this is a bit of a boundary violation, but what the heck). 1386 */ 1387 if ( s->enc_write_ctx && 1388 (EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE)) 1389 bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher); 1390 else 1391 bs = 0; 1392 1393 wr->data=p + bs; /* make room for IV in case of CBC */ 1394 wr->length=(int)len; 1395 wr->input=(unsigned char *)buf; 1396 1397 /* we now 'read' from wr->input, wr->length bytes into 1398 * wr->data */ 1399 1400 /* first we compress */ 1401 if (s->compress != NULL) 1402 { 1403 if (!ssl3_do_compress(s)) 1404 { 1405 SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE); 1406 goto err; 1407 } 1408 } 1409 else 1410 { 1411 memcpy(wr->data,wr->input,wr->length); 1412 wr->input=wr->data; 1413 } 1414 1415 /* we should still have the output to wr->data and the input 1416 * from wr->input. Length should be wr->length. 1417 * wr->data still points in the wb->buf */ 1418 1419 if (mac_size != 0) 1420 { 1421 s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1); 1422 wr->length+=mac_size; 1423 } 1424 1425 /* this is true regardless of mac size */ 1426 wr->input=p; 1427 wr->data=p; 1428 1429 1430 /* ssl3_enc can only have an error on read */ 1431 if (bs) /* bs != 0 in case of CBC */ 1432 { 1433 RAND_pseudo_bytes(p,bs); 1434 /* master IV and last CBC residue stand for 1435 * the rest of randomness */ 1436 wr->length += bs; 1437 } 1438 1439 s->method->ssl3_enc->enc(s,1); 1440 1441 /* record length after mac and block padding */ 1442/* if (type == SSL3_RT_APPLICATION_DATA || 1443 (type == SSL3_RT_ALERT && ! SSL_in_init(s))) */ 1444 1445 /* there's only one epoch between handshake and app data */ 1446 1447 s2n(s->d1->w_epoch, pseq); 1448 1449 /* XDTLS: ?? */ 1450/* else 1451 s2n(s->d1->handshake_epoch, pseq); */ 1452 1453 memcpy(pseq, &(s->s3->write_sequence[2]), 6); 1454 pseq+=6; 1455 s2n(wr->length,pseq); 1456 1457 /* we should now have 1458 * wr->data pointing to the encrypted data, which is 1459 * wr->length long */ 1460 wr->type=type; /* not needed but helps for debugging */ 1461 wr->length+=DTLS1_RT_HEADER_LENGTH; 1462 1463#if 0 /* this is now done at the message layer */ 1464 /* buffer the record, making it easy to handle retransmits */ 1465 if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC) 1466 dtls1_buffer_record(s, wr->data, wr->length, 1467 *((PQ_64BIT *)&(s->s3->write_sequence[0]))); 1468#endif 1469 1470 ssl3_record_sequence_update(&(s->s3->write_sequence[0])); 1471 1472 if (create_empty_fragment) 1473 { 1474 /* we are in a recursive call; 1475 * just return the length, don't write out anything here 1476 */ 1477 return wr->length; 1478 } 1479 1480 /* now let's set up wb */ 1481 wb->left = prefix_len + wr->length; 1482 wb->offset = 0; 1483 1484 /* memorize arguments so that ssl3_write_pending can detect bad write retries later */ 1485 s->s3->wpend_tot=len; 1486 s->s3->wpend_buf=buf; 1487 s->s3->wpend_type=type; 1488 s->s3->wpend_ret=len; 1489 1490 /* we now just need to write the buffer */ 1491 return ssl3_write_pending(s,type,buf,len); 1492err: 1493 return -1; 1494 } 1495 1496 1497 1498static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap, 1499 PQ_64BIT *seq_num) 1500 { 1501#if PQ_64BIT_IS_INTEGER 1502 PQ_64BIT mask = 0x0000000000000001L; 1503#endif 1504 PQ_64BIT rcd_num, tmp; 1505 1506 pq_64bit_init(&rcd_num); 1507 pq_64bit_init(&tmp); 1508 1509 /* this is the sequence number for the record just read */ 1510 pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8); 1511 1512 1513 if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) || 1514 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num))) 1515 { 1516 pq_64bit_assign(seq_num, &rcd_num); 1517 pq_64bit_free(&rcd_num); 1518 pq_64bit_free(&tmp); 1519 return 1; /* this record is new */ 1520 } 1521 1522 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); 1523 1524 if ( pq_64bit_get_word(&tmp) > bitmap->length) 1525 { 1526 pq_64bit_free(&rcd_num); 1527 pq_64bit_free(&tmp); 1528 return 0; /* stale, outside the window */ 1529 } 1530 1531#if PQ_64BIT_IS_BIGNUM 1532 { 1533 int offset; 1534 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); 1535 pq_64bit_sub_word(&tmp, 1); 1536 offset = pq_64bit_get_word(&tmp); 1537 if ( pq_64bit_is_bit_set(&(bitmap->map), offset)) 1538 { 1539 pq_64bit_free(&rcd_num); 1540 pq_64bit_free(&tmp); 1541 return 0; 1542 } 1543 } 1544#else 1545 mask <<= (bitmap->max_seq_num - rcd_num - 1); 1546 if (bitmap->map & mask) 1547 return 0; /* record previously received */ 1548#endif 1549 1550 pq_64bit_assign(seq_num, &rcd_num); 1551 pq_64bit_free(&rcd_num); 1552 pq_64bit_free(&tmp); 1553 return 1; 1554 } 1555 1556 1557static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap) 1558 { 1559 unsigned int shift; 1560 PQ_64BIT rcd_num; 1561 PQ_64BIT tmp; 1562 PQ_64BIT_CTX *ctx; 1563 1564 pq_64bit_init(&rcd_num); 1565 pq_64bit_init(&tmp); 1566 1567 pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8); 1568 1569 /* unfortunate code complexity due to 64-bit manipulation support 1570 * on 32-bit machines */ 1571 if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) || 1572 pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num))) 1573 { 1574 pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num)); 1575 pq_64bit_add_word(&tmp, 1); 1576 1577 shift = (unsigned int)pq_64bit_get_word(&tmp); 1578 1579 pq_64bit_lshift(&(tmp), &(bitmap->map), shift); 1580 pq_64bit_assign(&(bitmap->map), &tmp); 1581 1582 pq_64bit_set_bit(&(bitmap->map), 0); 1583 pq_64bit_add_word(&rcd_num, 1); 1584 pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num); 1585 1586 pq_64bit_assign_word(&tmp, 1); 1587 pq_64bit_lshift(&tmp, &tmp, bitmap->length); 1588 ctx = pq_64bit_ctx_new(&ctx); 1589 pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx); 1590 pq_64bit_ctx_free(ctx); 1591 } 1592 else 1593 { 1594 pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); 1595 pq_64bit_sub_word(&tmp, 1); 1596 shift = (unsigned int)pq_64bit_get_word(&tmp); 1597 1598 pq_64bit_set_bit(&(bitmap->map), shift); 1599 } 1600 1601 pq_64bit_free(&rcd_num); 1602 pq_64bit_free(&tmp); 1603 } 1604 1605 1606int dtls1_dispatch_alert(SSL *s) 1607 { 1608 int i,j; 1609 void (*cb)(const SSL *ssl,int type,int val)=NULL; 1610 unsigned char buf[DTLS1_AL_HEADER_LENGTH]; 1611 unsigned char *ptr = &buf[0]; 1612 1613 s->s3->alert_dispatch=0; 1614 1615 memset(buf, 0x00, sizeof(buf)); 1616 *ptr++ = s->s3->send_alert[0]; 1617 *ptr++ = s->s3->send_alert[1]; 1618 1619#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 1620 if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) 1621 { 1622 s2n(s->d1->handshake_read_seq, ptr); 1623#if 0 1624 if ( s->d1->r_msg_hdr.frag_off == 0) /* waiting for a new msg */ 1625 1626 else 1627 s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */ 1628#endif 1629 1630#if 0 1631 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); 1632#endif 1633 l2n3(s->d1->r_msg_hdr.frag_off, ptr); 1634 } 1635#endif 1636 1637 i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0); 1638 if (i <= 0) 1639 { 1640 s->s3->alert_dispatch=1; 1641 /* fprintf( stderr, "not done with alert\n" ); */ 1642 } 1643 else 1644 { 1645 if (s->s3->send_alert[0] == SSL3_AL_FATAL 1646#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 1647 || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 1648#endif 1649 ) 1650 (void)BIO_flush(s->wbio); 1651 1652 if (s->msg_callback) 1653 s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 1654 2, s, s->msg_callback_arg); 1655 1656 if (s->info_callback != NULL) 1657 cb=s->info_callback; 1658 else if (s->ctx->info_callback != NULL) 1659 cb=s->ctx->info_callback; 1660 1661 if (cb != NULL) 1662 { 1663 j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1]; 1664 cb(s,SSL_CB_WRITE_ALERT,j); 1665 } 1666 } 1667 return(i); 1668 } 1669 1670 1671static DTLS1_BITMAP * 1672dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch) 1673 { 1674 1675 *is_next_epoch = 0; 1676 1677 /* In current epoch, accept HM, CCS, DATA, & ALERT */ 1678 if (rr->epoch == s->d1->r_epoch) 1679 return &s->d1->bitmap; 1680 1681 /* Only HM and ALERT messages can be from the next epoch */ 1682 else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) && 1683 (rr->type == SSL3_RT_HANDSHAKE || 1684 rr->type == SSL3_RT_ALERT)) 1685 { 1686 *is_next_epoch = 1; 1687 return &s->d1->next_bitmap; 1688 } 1689 1690 return NULL; 1691 } 1692 1693#if 0 1694static int 1695dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority, 1696 unsigned long *offset) 1697 { 1698 1699 /* alerts are passed up immediately */ 1700 if ( rr->type == SSL3_RT_APPLICATION_DATA || 1701 rr->type == SSL3_RT_ALERT) 1702 return 0; 1703 1704 /* Only need to buffer if a handshake is underway. 1705 * (this implies that Hello Request and Client Hello are passed up 1706 * immediately) */ 1707 if ( SSL_in_init(s)) 1708 { 1709 unsigned char *data = rr->data; 1710 /* need to extract the HM/CCS sequence number here */ 1711 if ( rr->type == SSL3_RT_HANDSHAKE || 1712 rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) 1713 { 1714 unsigned short seq_num; 1715 struct hm_header_st msg_hdr; 1716 struct ccs_header_st ccs_hdr; 1717 1718 if ( rr->type == SSL3_RT_HANDSHAKE) 1719 { 1720 dtls1_get_message_header(data, &msg_hdr); 1721 seq_num = msg_hdr.seq; 1722 *offset = msg_hdr.frag_off; 1723 } 1724 else 1725 { 1726 dtls1_get_ccs_header(data, &ccs_hdr); 1727 seq_num = ccs_hdr.seq; 1728 *offset = 0; 1729 } 1730 1731 /* this is either a record we're waiting for, or a 1732 * retransmit of something we happened to previously 1733 * receive (higher layers will drop the repeat silently */ 1734 if ( seq_num < s->d1->handshake_read_seq) 1735 return 0; 1736 if (rr->type == SSL3_RT_HANDSHAKE && 1737 seq_num == s->d1->handshake_read_seq && 1738 msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off) 1739 return 0; 1740 else if ( seq_num == s->d1->handshake_read_seq && 1741 (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC || 1742 msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off)) 1743 return 0; 1744 else 1745 { 1746 *priority = seq_num; 1747 return 1; 1748 } 1749 } 1750 else /* unknown record type */ 1751 return 0; 1752 } 1753 1754 return 0; 1755 } 1756#endif 1757 1758void 1759dtls1_reset_seq_numbers(SSL *s, int rw) 1760 { 1761 unsigned char *seq; 1762 unsigned int seq_bytes = sizeof(s->s3->read_sequence); 1763 1764 if ( rw & SSL3_CC_READ) 1765 { 1766 seq = s->s3->read_sequence; 1767 s->d1->r_epoch++; 1768 1769 pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map)); 1770 s->d1->bitmap.length = s->d1->next_bitmap.length; 1771 pq_64bit_assign(&(s->d1->bitmap.max_seq_num), 1772 &(s->d1->next_bitmap.max_seq_num)); 1773 1774 pq_64bit_free(&(s->d1->next_bitmap.map)); 1775 pq_64bit_free(&(s->d1->next_bitmap.max_seq_num)); 1776 memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP)); 1777 pq_64bit_init(&(s->d1->next_bitmap.map)); 1778 pq_64bit_init(&(s->d1->next_bitmap.max_seq_num)); 1779 } 1780 else 1781 { 1782 seq = s->s3->write_sequence; 1783 memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence)); 1784 s->d1->w_epoch++; 1785 } 1786 1787 memset(seq, 0x00, seq_bytes); 1788 } 1789 1790#if PQ_64BIT_IS_INTEGER 1791static PQ_64BIT 1792bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num) 1793 { 1794 PQ_64BIT _num; 1795 1796 _num = (((PQ_64BIT)bytes[0]) << 56) | 1797 (((PQ_64BIT)bytes[1]) << 48) | 1798 (((PQ_64BIT)bytes[2]) << 40) | 1799 (((PQ_64BIT)bytes[3]) << 32) | 1800 (((PQ_64BIT)bytes[4]) << 24) | 1801 (((PQ_64BIT)bytes[5]) << 16) | 1802 (((PQ_64BIT)bytes[6]) << 8) | 1803 (((PQ_64BIT)bytes[7]) ); 1804 1805 *num = _num ; 1806 return _num; 1807 } 1808#endif 1809 1810 1811static void 1812dtls1_clear_timeouts(SSL *s) 1813 { 1814 memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st)); 1815 }
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