sl@0: /* ssl/d1_pkt.c */
sl@0: /* 
sl@0:  * DTLS implementation written by Nagendra Modadugu
sl@0:  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.  
sl@0:  */
sl@0: /* ====================================================================
sl@0:  * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  *
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer. 
sl@0:  *
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in
sl@0:  *    the documentation and/or other materials provided with the
sl@0:  *    distribution.
sl@0:  *
sl@0:  * 3. All advertising materials mentioning features or use of this
sl@0:  *    software must display the following acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
sl@0:  *
sl@0:  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
sl@0:  *    endorse or promote products derived from this software without
sl@0:  *    prior written permission. For written permission, please contact
sl@0:  *    openssl-core@openssl.org.
sl@0:  *
sl@0:  * 5. Products derived from this software may not be called "OpenSSL"
sl@0:  *    nor may "OpenSSL" appear in their names without prior written
sl@0:  *    permission of the OpenSSL Project.
sl@0:  *
sl@0:  * 6. Redistributions of any form whatsoever must retain the following
sl@0:  *    acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
sl@0:  *
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
sl@0:  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
sl@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
sl@0:  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
sl@0:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
sl@0:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
sl@0:  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
sl@0:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
sl@0:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
sl@0:  * OF THE POSSIBILITY OF SUCH DAMAGE.
sl@0:  * ====================================================================
sl@0:  *
sl@0:  * This product includes cryptographic software written by Eric Young
sl@0:  * (eay@cryptsoft.com).  This product includes software written by Tim
sl@0:  * Hudson (tjh@cryptsoft.com).
sl@0:  *
sl@0:  */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include <errno.h>
sl@0: #define USE_SOCKETS
sl@0: #include "ssl_locl.h"
sl@0: #include <openssl/evp.h>
sl@0: #include <openssl/buffer.h>
sl@0: #include <openssl/pqueue.h>
sl@0: #include <openssl/rand.h>
sl@0: 
sl@0: static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, 
sl@0: 	int len, int peek);
sl@0: static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
sl@0: 	PQ_64BIT *seq_num);
sl@0: static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap);
sl@0: static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, 
sl@0:     unsigned int *is_next_epoch);
sl@0: #if 0
sl@0: static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr,
sl@0: 	unsigned short *priority, unsigned long *offset);
sl@0: #endif
sl@0: static int dtls1_buffer_record(SSL *s, record_pqueue *q,
sl@0: 	PQ_64BIT priority);
sl@0: static int dtls1_process_record(SSL *s);
sl@0: #if PQ_64BIT_IS_INTEGER
sl@0: static PQ_64BIT bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num);
sl@0: #endif
sl@0: static void dtls1_clear_timeouts(SSL *s);
sl@0: 
sl@0: /* copy buffered record into SSL structure */
sl@0: static int
sl@0: dtls1_copy_record(SSL *s, pitem *item)
sl@0:     {
sl@0:     DTLS1_RECORD_DATA *rdata;
sl@0: 
sl@0:     rdata = (DTLS1_RECORD_DATA *)item->data;
sl@0:     
sl@0:     if (s->s3->rbuf.buf != NULL)
sl@0:         OPENSSL_free(s->s3->rbuf.buf);
sl@0:     
sl@0:     s->packet = rdata->packet;
sl@0:     s->packet_length = rdata->packet_length;
sl@0:     memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
sl@0:     memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
sl@0:     
sl@0:     return(1);
sl@0:     }
sl@0: 
sl@0: 
sl@0: static int
sl@0: dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT priority)
sl@0: {
sl@0:     DTLS1_RECORD_DATA *rdata;
sl@0: 	pitem *item;
sl@0: 
sl@0: 	rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
sl@0: 	item = pitem_new(priority, rdata);
sl@0: 	if (rdata == NULL || item == NULL)
sl@0: 		{
sl@0: 		if (rdata != NULL) OPENSSL_free(rdata);
sl@0: 		if (item != NULL) pitem_free(item);
sl@0: 		
sl@0: 		SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
sl@0: 		return(0);
sl@0: 		}
sl@0: 	
sl@0: 	rdata->packet = s->packet;
sl@0: 	rdata->packet_length = s->packet_length;
sl@0: 	memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
sl@0: 	memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
sl@0: 
sl@0: 	item->data = rdata;
sl@0: 
sl@0: 	/* insert should not fail, since duplicates are dropped */
sl@0: 	if (pqueue_insert(queue->q, item) == NULL)
sl@0: 		{
sl@0: 		OPENSSL_free(rdata);
sl@0: 		pitem_free(item);
sl@0: 		return(0);
sl@0: 		}
sl@0: 
sl@0: 	s->packet = NULL;
sl@0: 	s->packet_length = 0;
sl@0: 	memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
sl@0: 	memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
sl@0: 	
sl@0: 	if (!ssl3_setup_buffers(s))
sl@0: 		{
sl@0: 		SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
sl@0: 		OPENSSL_free(rdata);
sl@0: 		pitem_free(item);
sl@0: 		return(0);
sl@0: 		}
sl@0: 	
sl@0: 	return(1);
sl@0:     }
sl@0: 
sl@0: 
sl@0: static int
sl@0: dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
sl@0:     {
sl@0:     pitem *item;
sl@0: 
sl@0:     item = pqueue_pop(queue->q);
sl@0:     if (item)
sl@0:         {
sl@0:         dtls1_copy_record(s, item);
sl@0: 
sl@0:         OPENSSL_free(item->data);
sl@0: 		pitem_free(item);
sl@0: 
sl@0:         return(1);
sl@0:         }
sl@0: 
sl@0:     return(0);
sl@0:     }
sl@0: 
sl@0: 
sl@0: /* retrieve a buffered record that belongs to the new epoch, i.e., not processed 
sl@0:  * yet */
sl@0: #define dtls1_get_unprocessed_record(s) \
sl@0:                    dtls1_retrieve_buffered_record((s), \
sl@0:                    &((s)->d1->unprocessed_rcds))
sl@0: 
sl@0: /* retrieve a buffered record that belongs to the current epoch, ie, processed */
sl@0: #define dtls1_get_processed_record(s) \
sl@0:                    dtls1_retrieve_buffered_record((s), \
sl@0:                    &((s)->d1->processed_rcds))
sl@0: 
sl@0: static int
sl@0: dtls1_process_buffered_records(SSL *s)
sl@0:     {
sl@0:     pitem *item;
sl@0:     
sl@0:     item = pqueue_peek(s->d1->unprocessed_rcds.q);
sl@0:     if (item)
sl@0:         {
sl@0:         DTLS1_RECORD_DATA *rdata;
sl@0:         rdata = (DTLS1_RECORD_DATA *)item->data;
sl@0:         
sl@0:         /* Check if epoch is current. */
sl@0:         if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
sl@0:             return(1);  /* Nothing to do. */
sl@0:         
sl@0:         /* Process all the records. */
sl@0:         while (pqueue_peek(s->d1->unprocessed_rcds.q))
sl@0:             {
sl@0:             dtls1_get_unprocessed_record(s);
sl@0:             if ( ! dtls1_process_record(s))
sl@0:                 return(0);
sl@0:             dtls1_buffer_record(s, &(s->d1->processed_rcds), 
sl@0:                 s->s3->rrec.seq_num);
sl@0:             }
sl@0:         }
sl@0: 
sl@0:     /* sync epoch numbers once all the unprocessed records 
sl@0:      * have been processed */
sl@0:     s->d1->processed_rcds.epoch = s->d1->r_epoch;
sl@0:     s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
sl@0: 
sl@0:     return(1);
sl@0:     }
sl@0: 
sl@0: 
sl@0: #if 0
sl@0: 
sl@0: static int
sl@0: dtls1_get_buffered_record(SSL *s)
sl@0: 	{
sl@0: 	pitem *item;
sl@0: 	PQ_64BIT priority = 
sl@0: 		(((PQ_64BIT)s->d1->handshake_read_seq) << 32) | 
sl@0: 		((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
sl@0: 	
sl@0: 	if ( ! SSL_in_init(s))  /* if we're not (re)negotiating, 
sl@0: 							   nothing buffered */
sl@0: 		return 0;
sl@0: 
sl@0: 
sl@0: 	item = pqueue_peek(s->d1->rcvd_records);
sl@0: 	if (item && item->priority == priority)
sl@0: 		{
sl@0: 		/* Check if we've received the record of interest.  It must be
sl@0: 		 * a handshake record, since data records as passed up without
sl@0: 		 * buffering */
sl@0: 		DTLS1_RECORD_DATA *rdata;
sl@0: 		item = pqueue_pop(s->d1->rcvd_records);
sl@0: 		rdata = (DTLS1_RECORD_DATA *)item->data;
sl@0: 		
sl@0: 		if (s->s3->rbuf.buf != NULL)
sl@0: 			OPENSSL_free(s->s3->rbuf.buf);
sl@0: 		
sl@0: 		s->packet = rdata->packet;
sl@0: 		s->packet_length = rdata->packet_length;
sl@0: 		memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
sl@0: 		memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
sl@0: 		
sl@0: 		OPENSSL_free(item->data);
sl@0: 		pitem_free(item);
sl@0: 		
sl@0: 		/* s->d1->next_expected_seq_num++; */
sl@0: 		return(1);
sl@0: 		}
sl@0: 	
sl@0: 	return 0;
sl@0: 	}
sl@0: 
sl@0: #endif
sl@0: 
sl@0: static int
sl@0: dtls1_process_record(SSL *s)
sl@0: {
sl@0:     int i,al;
sl@0: 	int clear=0;
sl@0:     int enc_err;
sl@0: 	SSL_SESSION *sess;
sl@0:     SSL3_RECORD *rr;
sl@0: 	unsigned int mac_size;
sl@0: 	unsigned char md[EVP_MAX_MD_SIZE];
sl@0: 
sl@0: 
sl@0: 	rr= &(s->s3->rrec);
sl@0:     sess = s->session;
sl@0: 
sl@0: 	/* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
sl@0: 	 * and we have that many bytes in s->packet
sl@0: 	 */
sl@0: 	rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
sl@0: 
sl@0: 	/* ok, we can now read from 's->packet' data into 'rr'
sl@0: 	 * rr->input points at rr->length bytes, which
sl@0: 	 * need to be copied into rr->data by either
sl@0: 	 * the decryption or by the decompression
sl@0: 	 * When the data is 'copied' into the rr->data buffer,
sl@0: 	 * rr->input will be pointed at the new buffer */ 
sl@0: 
sl@0: 	/* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
sl@0: 	 * rr->length bytes of encrypted compressed stuff. */
sl@0: 
sl@0: 	/* check is not needed I believe */
sl@0: 	if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
sl@0: 		{
sl@0: 		al=SSL_AD_RECORD_OVERFLOW;
sl@0: 		SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
sl@0: 		goto f_err;
sl@0: 		}
sl@0: 
sl@0: 	/* decrypt in place in 'rr->input' */
sl@0: 	rr->data=rr->input;
sl@0: 
sl@0: 	enc_err = s->method->ssl3_enc->enc(s,0);
sl@0: 	if (enc_err <= 0)
sl@0: 		{
sl@0: 		if (enc_err == 0)
sl@0: 			/* SSLerr() and ssl3_send_alert() have been called */
sl@0: 			goto err;
sl@0: 
sl@0: 		/* otherwise enc_err == -1 */
sl@0: 		goto decryption_failed_or_bad_record_mac;
sl@0: 		}
sl@0: 
sl@0: #ifdef TLS_DEBUG
sl@0: printf("dec %d\n",rr->length);
sl@0: { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
sl@0: printf("\n");
sl@0: #endif
sl@0: 
sl@0: 	/* r->length is now the compressed data plus mac */
sl@0: if (	(sess == NULL) ||
sl@0: 		(s->enc_read_ctx == NULL) ||
sl@0: 		(s->read_hash == NULL))
sl@0:     clear=1;
sl@0: 
sl@0: 	if (!clear)
sl@0: 		{
sl@0: 		mac_size=EVP_MD_size(s->read_hash);
sl@0: 
sl@0: 		if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
sl@0: 			{
sl@0: #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
sl@0: 			al=SSL_AD_RECORD_OVERFLOW;
sl@0: 			SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
sl@0: 			goto f_err;
sl@0: #else
sl@0: 			goto decryption_failed_or_bad_record_mac;
sl@0: #endif			
sl@0: 			}
sl@0: 		/* check the MAC for rr->input (it's in mac_size bytes at the tail) */
sl@0: 		if (rr->length < mac_size)
sl@0: 			{
sl@0: #if 0 /* OK only for stream ciphers */
sl@0: 			al=SSL_AD_DECODE_ERROR;
sl@0: 			SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
sl@0: 			goto f_err;
sl@0: #else
sl@0: 			goto decryption_failed_or_bad_record_mac;
sl@0: #endif
sl@0: 			}
sl@0: 		rr->length-=mac_size;
sl@0: 		i=s->method->ssl3_enc->mac(s,md,0);
sl@0: 		if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
sl@0: 			{
sl@0: 			goto decryption_failed_or_bad_record_mac;
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	/* r->length is now just compressed */
sl@0: 	if (s->expand != NULL)
sl@0: 		{
sl@0: 		if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
sl@0: 			{
sl@0: 			al=SSL_AD_RECORD_OVERFLOW;
sl@0: 			SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
sl@0: 			goto f_err;
sl@0: 			}
sl@0: 		if (!ssl3_do_uncompress(s))
sl@0: 			{
sl@0: 			al=SSL_AD_DECOMPRESSION_FAILURE;
sl@0: 			SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
sl@0: 			goto f_err;
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
sl@0: 		{
sl@0: 		al=SSL_AD_RECORD_OVERFLOW;
sl@0: 		SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
sl@0: 		goto f_err;
sl@0: 		}
sl@0: 
sl@0: 	rr->off=0;
sl@0: 	/* So at this point the following is true
sl@0: 	 * ssl->s3->rrec.type 	is the type of record
sl@0: 	 * ssl->s3->rrec.length	== number of bytes in record
sl@0: 	 * ssl->s3->rrec.off	== offset to first valid byte
sl@0: 	 * ssl->s3->rrec.data	== where to take bytes from, increment
sl@0: 	 *			   after use :-).
sl@0: 	 */
sl@0: 
sl@0: 	/* we have pulled in a full packet so zero things */
sl@0: 	s->packet_length=0;
sl@0:     dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
sl@0:     return(1);
sl@0: 
sl@0: decryption_failed_or_bad_record_mac:
sl@0: 	/* Separate 'decryption_failed' alert was introduced with TLS 1.0,
sl@0: 	 * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
sl@0: 	 * failure is directly visible from the ciphertext anyway,
sl@0: 	 * we should not reveal which kind of error occured -- this
sl@0: 	 * might become visible to an attacker (e.g. via logfile) */
sl@0: 	al=SSL_AD_BAD_RECORD_MAC;
sl@0: 	SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
sl@0: f_err:
sl@0: 	ssl3_send_alert(s,SSL3_AL_FATAL,al);
sl@0: err:
sl@0: 	return(0);
sl@0: }
sl@0: 
sl@0: 
sl@0: /* Call this to get a new input record.
sl@0:  * It will return <= 0 if more data is needed, normally due to an error
sl@0:  * or non-blocking IO.
sl@0:  * When it finishes, one packet has been decoded and can be found in
sl@0:  * ssl->s3->rrec.type    - is the type of record
sl@0:  * ssl->s3->rrec.data, 	 - data
sl@0:  * ssl->s3->rrec.length, - number of bytes
sl@0:  */
sl@0: /* used only by dtls1_read_bytes */
sl@0: int dtls1_get_record(SSL *s)
sl@0: 	{
sl@0: 	int ssl_major,ssl_minor,al;
sl@0: 	int i,n;
sl@0: 	SSL3_RECORD *rr;
sl@0: 	SSL_SESSION *sess;
sl@0: 	unsigned char *p;
sl@0: 	unsigned short version;
sl@0: 	DTLS1_BITMAP *bitmap;
sl@0: 	unsigned int is_next_epoch;
sl@0: 
sl@0: 	rr= &(s->s3->rrec);
sl@0: 	sess=s->session;
sl@0: 
sl@0:     /* The epoch may have changed.  If so, process all the
sl@0:      * pending records.  This is a non-blocking operation. */
sl@0:     if ( ! dtls1_process_buffered_records(s))
sl@0:         return 0;
sl@0: 
sl@0: 	/* if we're renegotiating, then there may be buffered records */
sl@0: 	if (dtls1_get_processed_record(s))
sl@0: 		return 1;
sl@0: 
sl@0: 	/* get something from the wire */
sl@0: again:
sl@0: 	/* check if we have the header */
sl@0: 	if (	(s->rstate != SSL_ST_READ_BODY) ||
sl@0: 		(s->packet_length < DTLS1_RT_HEADER_LENGTH)) 
sl@0: 		{
sl@0: 		n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
sl@0: 		/* read timeout is handled by dtls1_read_bytes */
sl@0: 		if (n <= 0) return(n); /* error or non-blocking */
sl@0: 
sl@0: 		OPENSSL_assert(s->packet_length == DTLS1_RT_HEADER_LENGTH);
sl@0: 
sl@0: 		s->rstate=SSL_ST_READ_BODY;
sl@0: 
sl@0: 		p=s->packet;
sl@0: 
sl@0: 		/* Pull apart the header into the DTLS1_RECORD */
sl@0: 		rr->type= *(p++);
sl@0: 		ssl_major= *(p++);
sl@0: 		ssl_minor= *(p++);
sl@0: 		version=(ssl_major<<8)|ssl_minor;
sl@0: 
sl@0: 		/* sequence number is 64 bits, with top 2 bytes = epoch */ 
sl@0: 		n2s(p,rr->epoch);
sl@0: 
sl@0: 		memcpy(&(s->s3->read_sequence[2]), p, 6);
sl@0: 		p+=6;
sl@0: 
sl@0: 		n2s(p,rr->length);
sl@0: 
sl@0: 		/* Lets check version */
sl@0: 		if (!s->first_packet)
sl@0: 			{
sl@0: 			if (version != s->version && version != DTLS1_BAD_VER)
sl@0: 				{
sl@0: 				SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
sl@0: 				/* Send back error using their
sl@0: 				 * version number :-) */
sl@0: 				s->version=version;
sl@0: 				al=SSL_AD_PROTOCOL_VERSION;
sl@0: 				goto f_err;
sl@0: 				}
sl@0: 			}
sl@0: 
sl@0: 		if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
sl@0: 		    (version & 0xff00) != (DTLS1_BAD_VER & 0xff00))
sl@0: 			{
sl@0: 			SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
sl@0: 			goto err;
sl@0: 			}
sl@0: 
sl@0: 		if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
sl@0: 			{
sl@0: 			al=SSL_AD_RECORD_OVERFLOW;
sl@0: 			SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
sl@0: 			goto f_err;
sl@0: 			}
sl@0: 
sl@0: 		s->client_version = version;
sl@0: 		/* now s->rstate == SSL_ST_READ_BODY */
sl@0: 		}
sl@0: 
sl@0: 	/* s->rstate == SSL_ST_READ_BODY, get and decode the data */
sl@0: 
sl@0: 	if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
sl@0: 		{
sl@0: 		/* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
sl@0: 		i=rr->length;
sl@0: 		n=ssl3_read_n(s,i,i,1);
sl@0: 		if (n <= 0) return(n); /* error or non-blocking io */
sl@0: 
sl@0: 		/* this packet contained a partial record, dump it */
sl@0: 		if ( n != i)
sl@0: 			{
sl@0: 			s->packet_length = 0;
sl@0: 			goto again;
sl@0: 			}
sl@0: 
sl@0: 		/* now n == rr->length,
sl@0: 		 * and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
sl@0: 		}
sl@0: 	s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
sl@0: 
sl@0: 	/* match epochs.  NULL means the packet is dropped on the floor */
sl@0: 	bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
sl@0: 	if ( bitmap == NULL)
sl@0:         {
sl@0:         s->packet_length = 0;  /* dump this record */
sl@0:         goto again;   /* get another record */
sl@0: 		}
sl@0: 
sl@0: 	/* check whether this is a repeat, or aged record */
sl@0: 	if ( ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num)))
sl@0: 		{
sl@0: 		s->packet_length=0; /* dump this record */
sl@0: 		goto again;     /* get another record */
sl@0: 		}
sl@0: 
sl@0: 	/* just read a 0 length packet */
sl@0: 	if (rr->length == 0) goto again;
sl@0: 
sl@0:     /* If this record is from the next epoch (either HM or ALERT), buffer it
sl@0:      * since it cannot be processed at this time.
sl@0:      * Records from the next epoch are marked as received even though they are 
sl@0:      * not processed, so as to prevent any potential resource DoS attack */
sl@0:     if (is_next_epoch)
sl@0:         {
sl@0:         dtls1_record_bitmap_update(s, bitmap);
sl@0:         dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num);
sl@0:         s->packet_length = 0;
sl@0:         goto again;
sl@0:         }
sl@0: 
sl@0:     if ( ! dtls1_process_record(s))
sl@0:         return(0);
sl@0: 
sl@0: 	dtls1_clear_timeouts(s);  /* done waiting */
sl@0: 	return(1);
sl@0: 
sl@0: f_err:
sl@0: 	ssl3_send_alert(s,SSL3_AL_FATAL,al);
sl@0: err:
sl@0: 	return(0);
sl@0: 	}
sl@0: 
sl@0: /* Return up to 'len' payload bytes received in 'type' records.
sl@0:  * 'type' is one of the following:
sl@0:  *
sl@0:  *   -  SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
sl@0:  *   -  SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
sl@0:  *   -  0 (during a shutdown, no data has to be returned)
sl@0:  *
sl@0:  * If we don't have stored data to work from, read a SSL/TLS record first
sl@0:  * (possibly multiple records if we still don't have anything to return).
sl@0:  *
sl@0:  * This function must handle any surprises the peer may have for us, such as
sl@0:  * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
sl@0:  * a surprise, but handled as if it were), or renegotiation requests.
sl@0:  * Also if record payloads contain fragments too small to process, we store
sl@0:  * them until there is enough for the respective protocol (the record protocol
sl@0:  * may use arbitrary fragmentation and even interleaving):
sl@0:  *     Change cipher spec protocol
sl@0:  *             just 1 byte needed, no need for keeping anything stored
sl@0:  *     Alert protocol
sl@0:  *             2 bytes needed (AlertLevel, AlertDescription)
sl@0:  *     Handshake protocol
sl@0:  *             4 bytes needed (HandshakeType, uint24 length) -- we just have
sl@0:  *             to detect unexpected Client Hello and Hello Request messages
sl@0:  *             here, anything else is handled by higher layers
sl@0:  *     Application data protocol
sl@0:  *             none of our business
sl@0:  */
sl@0: int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
sl@0: 	{
sl@0: 	int al,i,j,ret;
sl@0: 	unsigned int n;
sl@0: 	SSL3_RECORD *rr;
sl@0: 	void (*cb)(const SSL *ssl,int type2,int val)=NULL;
sl@0: 
sl@0: 	if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
sl@0: 		if (!ssl3_setup_buffers(s))
sl@0: 			return(-1);
sl@0: 
sl@0:     /* XXX: check what the second '&& type' is about */
sl@0: 	if ((type && (type != SSL3_RT_APPLICATION_DATA) && 
sl@0: 		(type != SSL3_RT_HANDSHAKE) && type) ||
sl@0: 	    (peek && (type != SSL3_RT_APPLICATION_DATA)))
sl@0: 		{
sl@0: 		SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
sl@0: 		return -1;
sl@0: 		}
sl@0: 
sl@0: 	/* check whether there's a handshake message (client hello?) waiting */
sl@0: 	if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
sl@0: 		return ret;
sl@0: 
sl@0: 	/* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
sl@0: 
sl@0: 	if (!s->in_handshake && SSL_in_init(s))
sl@0: 		{
sl@0: 		/* type == SSL3_RT_APPLICATION_DATA */
sl@0: 		i=s->handshake_func(s);
sl@0: 		if (i < 0) return(i);
sl@0: 		if (i == 0)
sl@0: 			{
sl@0: 			SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
sl@0: 			return(-1);
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: start:
sl@0: 	s->rwstate=SSL_NOTHING;
sl@0: 
sl@0: 	/* s->s3->rrec.type	    - is the type of record
sl@0: 	 * s->s3->rrec.data,    - data
sl@0: 	 * s->s3->rrec.off,     - offset into 'data' for next read
sl@0: 	 * s->s3->rrec.length,  - number of bytes. */
sl@0: 	rr = &(s->s3->rrec);
sl@0: 
sl@0: 	/* get new packet if necessary */
sl@0: 	if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
sl@0: 		{
sl@0: 		ret=dtls1_get_record(s);
sl@0: 		if (ret <= 0) 
sl@0: 			{
sl@0: 			ret = dtls1_read_failed(s, ret);
sl@0: 			/* anything other than a timeout is an error */
sl@0: 			if (ret <= 0)  
sl@0: 				return(ret);
sl@0: 			else
sl@0: 				goto start;
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	/* we now have a packet which can be read and processed */
sl@0: 
sl@0: 	if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
sl@0: 	                               * reset by ssl3_get_finished */
sl@0: 		&& (rr->type != SSL3_RT_HANDSHAKE))
sl@0: 		{
sl@0: 		al=SSL_AD_UNEXPECTED_MESSAGE;
sl@0: 		SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
sl@0: 		goto err;
sl@0: 		}
sl@0: 
sl@0: 	/* If the other end has shut down, throw anything we read away
sl@0: 	 * (even in 'peek' mode) */
sl@0: 	if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
sl@0: 		{
sl@0: 		rr->length=0;
sl@0: 		s->rwstate=SSL_NOTHING;
sl@0: 		return(0);
sl@0: 		}
sl@0: 
sl@0: 
sl@0: 	if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
sl@0: 		{
sl@0: 		/* make sure that we are not getting application data when we
sl@0: 		 * are doing a handshake for the first time */
sl@0: 		if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
sl@0: 			(s->enc_read_ctx == NULL))
sl@0: 			{
sl@0: 			al=SSL_AD_UNEXPECTED_MESSAGE;
sl@0: 			SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
sl@0: 			goto f_err;
sl@0: 			}
sl@0: 
sl@0: 		if (len <= 0) return(len);
sl@0: 
sl@0: 		if ((unsigned int)len > rr->length)
sl@0: 			n = rr->length;
sl@0: 		else
sl@0: 			n = (unsigned int)len;
sl@0: 
sl@0: 		memcpy(buf,&(rr->data[rr->off]),n);
sl@0: 		if (!peek)
sl@0: 			{
sl@0: 			rr->length-=n;
sl@0: 			rr->off+=n;
sl@0: 			if (rr->length == 0)
sl@0: 				{
sl@0: 				s->rstate=SSL_ST_READ_HEADER;
sl@0: 				rr->off=0;
sl@0: 				}
sl@0: 			}
sl@0: 		return(n);
sl@0: 		}
sl@0: 
sl@0: 
sl@0: 	/* If we get here, then type != rr->type; if we have a handshake
sl@0: 	 * message, then it was unexpected (Hello Request or Client Hello). */
sl@0: 
sl@0: 	/* In case of record types for which we have 'fragment' storage,
sl@0: 	 * fill that so that we can process the data at a fixed place.
sl@0: 	 */
sl@0: 		{
sl@0: 		unsigned int k, dest_maxlen = 0;
sl@0: 		unsigned char *dest = NULL;
sl@0: 		unsigned int *dest_len = NULL;
sl@0: 
sl@0: 		if (rr->type == SSL3_RT_HANDSHAKE)
sl@0: 			{
sl@0: 			dest_maxlen = sizeof s->d1->handshake_fragment;
sl@0: 			dest = s->d1->handshake_fragment;
sl@0: 			dest_len = &s->d1->handshake_fragment_len;
sl@0: 			}
sl@0: 		else if (rr->type == SSL3_RT_ALERT)
sl@0: 			{
sl@0: 			dest_maxlen = sizeof(s->d1->alert_fragment);
sl@0: 			dest = s->d1->alert_fragment;
sl@0: 			dest_len = &s->d1->alert_fragment_len;
sl@0: 			}
sl@0:                 /* else it's a CCS message, or it's wrong */
sl@0:                 else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
sl@0:                         {
sl@0:                           /* Not certain if this is the right error handling */
sl@0:                           al=SSL_AD_UNEXPECTED_MESSAGE;
sl@0:                           SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
sl@0:                           goto f_err;
sl@0:                         }
sl@0: 
sl@0: 
sl@0: 		if (dest_maxlen > 0)
sl@0: 			{
sl@0:             /* XDTLS:  In a pathalogical case, the Client Hello
sl@0:              *  may be fragmented--don't always expect dest_maxlen bytes */
sl@0: 			if ( rr->length < dest_maxlen)
sl@0: 				{
sl@0: 				s->rstate=SSL_ST_READ_HEADER;
sl@0: 				rr->length = 0;
sl@0: 				goto start;
sl@0: 				}
sl@0: 
sl@0: 			/* now move 'n' bytes: */
sl@0: 			for ( k = 0; k < dest_maxlen; k++)
sl@0: 				{
sl@0: 				dest[k] = rr->data[rr->off++];
sl@0: 				rr->length--;
sl@0: 				}
sl@0: 			*dest_len = dest_maxlen;
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	/* s->d1->handshake_fragment_len == 12  iff  rr->type == SSL3_RT_HANDSHAKE;
sl@0: 	 * s->d1->alert_fragment_len == 7      iff  rr->type == SSL3_RT_ALERT.
sl@0: 	 * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
sl@0: 
sl@0: 	/* If we are a client, check for an incoming 'Hello Request': */
sl@0: 	if ((!s->server) &&
sl@0: 		(s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
sl@0: 		(s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
sl@0: 		(s->session != NULL) && (s->session->cipher != NULL))
sl@0: 		{
sl@0: 		s->d1->handshake_fragment_len = 0;
sl@0: 
sl@0: 		if ((s->d1->handshake_fragment[1] != 0) ||
sl@0: 			(s->d1->handshake_fragment[2] != 0) ||
sl@0: 			(s->d1->handshake_fragment[3] != 0))
sl@0: 			{
sl@0: 			al=SSL_AD_DECODE_ERROR;
sl@0: 			SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
sl@0: 			goto err;
sl@0: 			}
sl@0: 
sl@0: 		/* no need to check sequence number on HELLO REQUEST messages */
sl@0: 
sl@0: 		if (s->msg_callback)
sl@0: 			s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, 
sl@0: 				s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
sl@0: 
sl@0: 		if (SSL_is_init_finished(s) &&
sl@0: 			!(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
sl@0: 			!s->s3->renegotiate)
sl@0: 			{
sl@0: 			ssl3_renegotiate(s);
sl@0: 			if (ssl3_renegotiate_check(s))
sl@0: 				{
sl@0: 				i=s->handshake_func(s);
sl@0: 				if (i < 0) return(i);
sl@0: 				if (i == 0)
sl@0: 					{
sl@0: 					SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
sl@0: 					return(-1);
sl@0: 					}
sl@0: 
sl@0: 				if (!(s->mode & SSL_MODE_AUTO_RETRY))
sl@0: 					{
sl@0: 					if (s->s3->rbuf.left == 0) /* no read-ahead left? */
sl@0: 						{
sl@0: 						BIO *bio;
sl@0: 						/* In the case where we try to read application data,
sl@0: 						 * but we trigger an SSL handshake, we return -1 with
sl@0: 						 * the retry option set.  Otherwise renegotiation may
sl@0: 						 * cause nasty problems in the blocking world */
sl@0: 						s->rwstate=SSL_READING;
sl@0: 						bio=SSL_get_rbio(s);
sl@0: 						BIO_clear_retry_flags(bio);
sl@0: 						BIO_set_retry_read(bio);
sl@0: 						return(-1);
sl@0: 						}
sl@0: 					}
sl@0: 				}
sl@0: 			}
sl@0: 		/* we either finished a handshake or ignored the request,
sl@0: 		 * now try again to obtain the (application) data we were asked for */
sl@0: 		goto start;
sl@0: 		}
sl@0: 
sl@0: 	if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
sl@0: 		{
sl@0: 		int alert_level = s->d1->alert_fragment[0];
sl@0: 		int alert_descr = s->d1->alert_fragment[1];
sl@0: 
sl@0: 		s->d1->alert_fragment_len = 0;
sl@0: 
sl@0: 		if (s->msg_callback)
sl@0: 			s->msg_callback(0, s->version, SSL3_RT_ALERT, 
sl@0: 				s->d1->alert_fragment, 2, s, s->msg_callback_arg);
sl@0: 
sl@0: 		if (s->info_callback != NULL)
sl@0: 			cb=s->info_callback;
sl@0: 		else if (s->ctx->info_callback != NULL)
sl@0: 			cb=s->ctx->info_callback;
sl@0: 
sl@0: 		if (cb != NULL)
sl@0: 			{
sl@0: 			j = (alert_level << 8) | alert_descr;
sl@0: 			cb(s, SSL_CB_READ_ALERT, j);
sl@0: 			}
sl@0: 
sl@0: 		if (alert_level == 1) /* warning */
sl@0: 			{
sl@0: 			s->s3->warn_alert = alert_descr;
sl@0: 			if (alert_descr == SSL_AD_CLOSE_NOTIFY)
sl@0: 				{
sl@0: 				s->shutdown |= SSL_RECEIVED_SHUTDOWN;
sl@0: 				return(0);
sl@0: 				}
sl@0: #if 0
sl@0:             /* XXX: this is a possible improvement in the future */
sl@0: 			/* now check if it's a missing record */
sl@0: 			if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
sl@0: 				{
sl@0: 				unsigned short seq;
sl@0: 				unsigned int frag_off;
sl@0: 				unsigned char *p = &(s->d1->alert_fragment[2]);
sl@0: 
sl@0: 				n2s(p, seq);
sl@0: 				n2l3(p, frag_off);
sl@0: 
sl@0: 				dtls1_retransmit_message(s, seq, frag_off, &found);
sl@0: 				if ( ! found  && SSL_in_init(s))
sl@0: 					{
sl@0: 					/* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
sl@0: 					/* requested a message not yet sent, 
sl@0: 					   send an alert ourselves */
sl@0: 					ssl3_send_alert(s,SSL3_AL_WARNING,
sl@0: 						DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
sl@0: 					}
sl@0: 				}
sl@0: #endif
sl@0: 			}
sl@0: 		else if (alert_level == 2) /* fatal */
sl@0: 			{
sl@0: 			char tmp[16];
sl@0: 
sl@0: 			s->rwstate=SSL_NOTHING;
sl@0: 			s->s3->fatal_alert = alert_descr;
sl@0: 			SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
sl@0: 			BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
sl@0: 			ERR_add_error_data(2,"SSL alert number ",tmp);
sl@0: 			s->shutdown|=SSL_RECEIVED_SHUTDOWN;
sl@0: 			SSL_CTX_remove_session(s->ctx,s->session);
sl@0: 			return(0);
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			al=SSL_AD_ILLEGAL_PARAMETER;
sl@0: 			SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
sl@0: 			goto f_err;
sl@0: 			}
sl@0: 
sl@0: 		goto start;
sl@0: 		}
sl@0: 
sl@0: 	if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
sl@0: 		{
sl@0: 		s->rwstate=SSL_NOTHING;
sl@0: 		rr->length=0;
sl@0: 		return(0);
sl@0: 		}
sl@0: 
sl@0: 	if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
sl@0: 		{
sl@0: 		struct ccs_header_st ccs_hdr;
sl@0: 
sl@0: 		dtls1_get_ccs_header(rr->data, &ccs_hdr);
sl@0: 
sl@0: 		/* 'Change Cipher Spec' is just a single byte, so we know
sl@0: 		 * exactly what the record payload has to look like */
sl@0: 		/* XDTLS: check that epoch is consistent */
sl@0: 		if (	(s->client_version == DTLS1_BAD_VER && rr->length != 3) ||
sl@0: 			(s->client_version != DTLS1_BAD_VER && rr->length != DTLS1_CCS_HEADER_LENGTH) || 
sl@0: 			(rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
sl@0: 			{
sl@0: 			i=SSL_AD_ILLEGAL_PARAMETER;
sl@0: 			SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
sl@0: 			goto err;
sl@0: 			}
sl@0: 
sl@0: 		rr->length=0;
sl@0: 
sl@0: 		if (s->msg_callback)
sl@0: 			s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, 
sl@0: 				rr->data, 1, s, s->msg_callback_arg);
sl@0: 
sl@0: 		s->s3->change_cipher_spec=1;
sl@0: 		if (!ssl3_do_change_cipher_spec(s))
sl@0: 			goto err;
sl@0: 
sl@0: 		/* do this whenever CCS is processed */
sl@0: 		dtls1_reset_seq_numbers(s, SSL3_CC_READ);
sl@0: 
sl@0: 		if (s->client_version == DTLS1_BAD_VER)
sl@0: 			s->d1->handshake_read_seq++;
sl@0: 
sl@0: 		goto start;
sl@0: 		}
sl@0: 
sl@0: 	/* Unexpected handshake message (Client Hello, or protocol violation) */
sl@0: 	if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && 
sl@0: 		!s->in_handshake)
sl@0: 		{
sl@0: 		struct hm_header_st msg_hdr;
sl@0: 		
sl@0: 		/* this may just be a stale retransmit */
sl@0: 		dtls1_get_message_header(rr->data, &msg_hdr);
sl@0: 		if( rr->epoch != s->d1->r_epoch)
sl@0: 			{
sl@0: 			rr->length = 0;
sl@0: 			goto start;
sl@0: 			}
sl@0: 
sl@0: 		if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
sl@0: 			!(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
sl@0: 			{
sl@0: #if 0 /* worked only because C operator preferences are not as expected (and
sl@0:        * because this is not really needed for clients except for detecting
sl@0:        * protocol violations): */
sl@0: 			s->state=SSL_ST_BEFORE|(s->server)
sl@0: 				?SSL_ST_ACCEPT
sl@0: 				:SSL_ST_CONNECT;
sl@0: #else
sl@0: 			s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
sl@0: #endif
sl@0: 			s->new_session=1;
sl@0: 			}
sl@0: 		i=s->handshake_func(s);
sl@0: 		if (i < 0) return(i);
sl@0: 		if (i == 0)
sl@0: 			{
sl@0: 			SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
sl@0: 			return(-1);
sl@0: 			}
sl@0: 
sl@0: 		if (!(s->mode & SSL_MODE_AUTO_RETRY))
sl@0: 			{
sl@0: 			if (s->s3->rbuf.left == 0) /* no read-ahead left? */
sl@0: 				{
sl@0: 				BIO *bio;
sl@0: 				/* In the case where we try to read application data,
sl@0: 				 * but we trigger an SSL handshake, we return -1 with
sl@0: 				 * the retry option set.  Otherwise renegotiation may
sl@0: 				 * cause nasty problems in the blocking world */
sl@0: 				s->rwstate=SSL_READING;
sl@0: 				bio=SSL_get_rbio(s);
sl@0: 				BIO_clear_retry_flags(bio);
sl@0: 				BIO_set_retry_read(bio);
sl@0: 				return(-1);
sl@0: 				}
sl@0: 			}
sl@0: 		goto start;
sl@0: 		}
sl@0: 
sl@0: 	switch (rr->type)
sl@0: 		{
sl@0: 	default:
sl@0: #ifndef OPENSSL_NO_TLS
sl@0: 		/* TLS just ignores unknown message types */
sl@0: 		if (s->version == TLS1_VERSION)
sl@0: 			{
sl@0: 			rr->length = 0;
sl@0: 			goto start;
sl@0: 			}
sl@0: #endif
sl@0: 		al=SSL_AD_UNEXPECTED_MESSAGE;
sl@0: 		SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
sl@0: 		goto f_err;
sl@0: 	case SSL3_RT_CHANGE_CIPHER_SPEC:
sl@0: 	case SSL3_RT_ALERT:
sl@0: 	case SSL3_RT_HANDSHAKE:
sl@0: 		/* we already handled all of these, with the possible exception
sl@0: 		 * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
sl@0: 		 * should not happen when type != rr->type */
sl@0: 		al=SSL_AD_UNEXPECTED_MESSAGE;
sl@0: 		SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
sl@0: 		goto f_err;
sl@0: 	case SSL3_RT_APPLICATION_DATA:
sl@0: 		/* At this point, we were expecting handshake data,
sl@0: 		 * but have application data.  If the library was
sl@0: 		 * running inside ssl3_read() (i.e. in_read_app_data
sl@0: 		 * is set) and it makes sense to read application data
sl@0: 		 * at this point (session renegotiation not yet started),
sl@0: 		 * we will indulge it.
sl@0: 		 */
sl@0: 		if (s->s3->in_read_app_data &&
sl@0: 			(s->s3->total_renegotiations != 0) &&
sl@0: 			((
sl@0: 				(s->state & SSL_ST_CONNECT) &&
sl@0: 				(s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
sl@0: 				(s->state <= SSL3_ST_CR_SRVR_HELLO_A)
sl@0: 				) || (
sl@0: 					(s->state & SSL_ST_ACCEPT) &&
sl@0: 					(s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
sl@0: 					(s->state >= SSL3_ST_SR_CLNT_HELLO_A)
sl@0: 					)
sl@0: 				))
sl@0: 			{
sl@0: 			s->s3->in_read_app_data=2;
sl@0: 			return(-1);
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			al=SSL_AD_UNEXPECTED_MESSAGE;
sl@0: 			SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
sl@0: 			goto f_err;
sl@0: 			}
sl@0: 		}
sl@0: 	/* not reached */
sl@0: 
sl@0: f_err:
sl@0: 	ssl3_send_alert(s,SSL3_AL_FATAL,al);
sl@0: err:
sl@0: 	return(-1);
sl@0: 	}
sl@0: 
sl@0: int
sl@0: dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
sl@0: 	{
sl@0: 	unsigned int n,tot;
sl@0: 	int i;
sl@0: 
sl@0: 	if (SSL_in_init(s) && !s->in_handshake)
sl@0: 		{
sl@0: 		i=s->handshake_func(s);
sl@0: 		if (i < 0) return(i);
sl@0: 		if (i == 0)
sl@0: 			{
sl@0: 			SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
sl@0: 			return -1;
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	tot = s->s3->wnum;
sl@0: 	n = len - tot;
sl@0: 
sl@0: 	while( n)
sl@0: 		{
sl@0: 		/* dtls1_write_bytes sends one record at a time, sized according to 
sl@0: 		 * the currently known MTU */
sl@0: 		i = dtls1_write_bytes(s, type, buf_, len);
sl@0: 		if (i <= 0) return i;
sl@0: 		
sl@0: 		if ((i == (int)n) ||
sl@0: 			(type == SSL3_RT_APPLICATION_DATA &&
sl@0: 				(s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
sl@0: 			{
sl@0: 			/* next chunk of data should get another prepended empty fragment
sl@0: 			 * in ciphersuites with known-IV weakness: */
sl@0: 			s->s3->empty_fragment_done = 0;
sl@0: 			return tot+i;
sl@0: 			}
sl@0: 
sl@0: 		tot += i;
sl@0: 		n-=i;
sl@0: 		}
sl@0: 
sl@0: 	return tot;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: 	/* this only happens when a client hello is received and a handshake 
sl@0: 	 * is started. */
sl@0: static int
sl@0: have_handshake_fragment(SSL *s, int type, unsigned char *buf, 
sl@0: 	int len, int peek)
sl@0: 	{
sl@0: 	
sl@0: 	if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
sl@0: 		/* (partially) satisfy request from storage */
sl@0: 		{
sl@0: 		unsigned char *src = s->d1->handshake_fragment;
sl@0: 		unsigned char *dst = buf;
sl@0: 		unsigned int k,n;
sl@0: 		
sl@0: 		/* peek == 0 */
sl@0: 		n = 0;
sl@0: 		while ((len > 0) && (s->d1->handshake_fragment_len > 0))
sl@0: 			{
sl@0: 			*dst++ = *src++;
sl@0: 			len--; s->d1->handshake_fragment_len--;
sl@0: 			n++;
sl@0: 			}
sl@0: 		/* move any remaining fragment bytes: */
sl@0: 		for (k = 0; k < s->d1->handshake_fragment_len; k++)
sl@0: 			s->d1->handshake_fragment[k] = *src++;
sl@0: 		return n;
sl@0: 		}
sl@0: 	
sl@0: 	return 0;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: 
sl@0: 
sl@0: /* Call this to write data in records of type 'type'
sl@0:  * It will return <= 0 if not all data has been sent or non-blocking IO.
sl@0:  */
sl@0: int dtls1_write_bytes(SSL *s, int type, const void *buf_, int len)
sl@0: 	{
sl@0: 	const unsigned char *buf=buf_;
sl@0: 	unsigned int tot,n,nw;
sl@0: 	int i;
sl@0: 	unsigned int mtu;
sl@0: 
sl@0: 	s->rwstate=SSL_NOTHING;
sl@0: 	tot=s->s3->wnum;
sl@0: 
sl@0: 	n=(len-tot);
sl@0: 
sl@0: 	/* handshake layer figures out MTU for itself, but data records
sl@0: 	 * are also sent through this interface, so need to figure out MTU */
sl@0: #if 0
sl@0: 	mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_MTU, 0, NULL);
sl@0: 	mtu += DTLS1_HM_HEADER_LENGTH;  /* HM already inserted */
sl@0: #endif
sl@0: 	mtu = s->d1->mtu;
sl@0: 
sl@0: 	if (mtu > SSL3_RT_MAX_PLAIN_LENGTH)
sl@0: 		mtu = SSL3_RT_MAX_PLAIN_LENGTH;
sl@0: 
sl@0: 	if (n > mtu)
sl@0: 		nw=mtu;
sl@0: 	else
sl@0: 		nw=n;
sl@0: 	
sl@0: 	i=do_dtls1_write(s, type, &(buf[tot]), nw, 0);
sl@0: 	if (i <= 0)
sl@0: 		{
sl@0: 		s->s3->wnum=tot;
sl@0: 		return i;
sl@0: 		}
sl@0: 
sl@0: 	if ( (int)s->s3->wnum + i == len)
sl@0: 		s->s3->wnum = 0;
sl@0: 	else 
sl@0: 		s->s3->wnum += i;
sl@0: 
sl@0: 	return tot + i;
sl@0: 	}
sl@0: 
sl@0: int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
sl@0: 	{
sl@0: 	unsigned char *p,*pseq;
sl@0: 	int i,mac_size,clear=0;
sl@0: 	int prefix_len = 0;
sl@0: 	SSL3_RECORD *wr;
sl@0: 	SSL3_BUFFER *wb;
sl@0: 	SSL_SESSION *sess;
sl@0: 	int bs;
sl@0: 
sl@0: 	/* first check if there is a SSL3_BUFFER still being written
sl@0: 	 * out.  This will happen with non blocking IO */
sl@0: 	if (s->s3->wbuf.left != 0)
sl@0: 		{
sl@0: 		OPENSSL_assert(0); /* XDTLS:  want to see if we ever get here */
sl@0: 		return(ssl3_write_pending(s,type,buf,len));
sl@0: 		}
sl@0: 
sl@0: 	/* If we have an alert to send, lets send it */
sl@0: 	if (s->s3->alert_dispatch)
sl@0: 		{
sl@0: 		i=s->method->ssl_dispatch_alert(s);
sl@0: 		if (i <= 0)
sl@0: 			return(i);
sl@0: 		/* if it went, fall through and send more stuff */
sl@0: 		}
sl@0: 
sl@0: 	if (len == 0 && !create_empty_fragment)
sl@0: 		return 0;
sl@0: 
sl@0: 	wr= &(s->s3->wrec);
sl@0: 	wb= &(s->s3->wbuf);
sl@0: 	sess=s->session;
sl@0: 
sl@0: 	if (	(sess == NULL) ||
sl@0: 		(s->enc_write_ctx == NULL) ||
sl@0: 		(s->write_hash == NULL))
sl@0: 		clear=1;
sl@0: 
sl@0: 	if (clear)
sl@0: 		mac_size=0;
sl@0: 	else
sl@0: 		mac_size=EVP_MD_size(s->write_hash);
sl@0: 
sl@0: 	/* DTLS implements explicit IV, so no need for empty fragments */
sl@0: #if 0
sl@0: 	/* 'create_empty_fragment' is true only when this function calls itself */
sl@0: 	if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
sl@0: 		&& SSL_version(s) != DTLS1_VERSION)
sl@0: 		{
sl@0: 		/* countermeasure against known-IV weakness in CBC ciphersuites
sl@0: 		 * (see http://www.openssl.org/~bodo/tls-cbc.txt) 
sl@0: 		 */
sl@0: 
sl@0: 		if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
sl@0: 			{
sl@0: 			/* recursive function call with 'create_empty_fragment' set;
sl@0: 			 * this prepares and buffers the data for an empty fragment
sl@0: 			 * (these 'prefix_len' bytes are sent out later
sl@0: 			 * together with the actual payload) */
sl@0: 			prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
sl@0: 			if (prefix_len <= 0)
sl@0: 				goto err;
sl@0: 
sl@0: 			if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
sl@0: 				{
sl@0: 				/* insufficient space */
sl@0: 				SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
sl@0: 				goto err;
sl@0: 				}
sl@0: 			}
sl@0: 		
sl@0: 		s->s3->empty_fragment_done = 1;
sl@0: 		}
sl@0: #endif
sl@0: 
sl@0: 	p = wb->buf + prefix_len;
sl@0: 
sl@0: 	/* write the header */
sl@0: 
sl@0: 	*(p++)=type&0xff;
sl@0: 	wr->type=type;
sl@0: 
sl@0: 	if (s->client_version == DTLS1_BAD_VER)
sl@0: 		*(p++) = DTLS1_BAD_VER>>8,
sl@0: 		*(p++) = DTLS1_BAD_VER&0xff;
sl@0: 	else
sl@0: 		*(p++)=(s->version>>8),
sl@0: 		*(p++)=s->version&0xff;
sl@0: 
sl@0: 	/* field where we are to write out packet epoch, seq num and len */
sl@0: 	pseq=p; 
sl@0: 	p+=10;
sl@0: 
sl@0: 	/* lets setup the record stuff. */
sl@0: 
sl@0: 	/* Make space for the explicit IV in case of CBC.
sl@0: 	 * (this is a bit of a boundary violation, but what the heck).
sl@0: 	 */
sl@0: 	if ( s->enc_write_ctx && 
sl@0: 		(EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
sl@0: 		bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
sl@0: 	else
sl@0: 		bs = 0;
sl@0: 
sl@0: 	wr->data=p + bs;  /* make room for IV in case of CBC */
sl@0: 	wr->length=(int)len;
sl@0: 	wr->input=(unsigned char *)buf;
sl@0: 
sl@0: 	/* we now 'read' from wr->input, wr->length bytes into
sl@0: 	 * wr->data */
sl@0: 
sl@0: 	/* first we compress */
sl@0: 	if (s->compress != NULL)
sl@0: 		{
sl@0: 		if (!ssl3_do_compress(s))
sl@0: 			{
sl@0: 			SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
sl@0: 			goto err;
sl@0: 			}
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		memcpy(wr->data,wr->input,wr->length);
sl@0: 		wr->input=wr->data;
sl@0: 		}
sl@0: 
sl@0: 	/* we should still have the output to wr->data and the input
sl@0: 	 * from wr->input.  Length should be wr->length.
sl@0: 	 * wr->data still points in the wb->buf */
sl@0: 
sl@0: 	if (mac_size != 0)
sl@0: 		{
sl@0: 		s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1);
sl@0: 		wr->length+=mac_size;
sl@0: 		}
sl@0: 
sl@0: 	/* this is true regardless of mac size */
sl@0: 	wr->input=p;
sl@0: 	wr->data=p;
sl@0: 
sl@0: 
sl@0: 	/* ssl3_enc can only have an error on read */
sl@0: 	if (bs)	/* bs != 0 in case of CBC */
sl@0: 		{
sl@0: 		RAND_pseudo_bytes(p,bs);
sl@0: 		/* master IV and last CBC residue stand for
sl@0: 		 * the rest of randomness */
sl@0: 		wr->length += bs;
sl@0: 		}
sl@0: 
sl@0: 	s->method->ssl3_enc->enc(s,1);
sl@0: 
sl@0: 	/* record length after mac and block padding */
sl@0: /*	if (type == SSL3_RT_APPLICATION_DATA ||
sl@0: 	(type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
sl@0: 	
sl@0: 	/* there's only one epoch between handshake and app data */
sl@0: 	
sl@0: 	s2n(s->d1->w_epoch, pseq);
sl@0: 
sl@0: 	/* XDTLS: ?? */
sl@0: /*	else
sl@0: 	s2n(s->d1->handshake_epoch, pseq); */
sl@0: 
sl@0: 	memcpy(pseq, &(s->s3->write_sequence[2]), 6);
sl@0: 	pseq+=6;
sl@0: 	s2n(wr->length,pseq);
sl@0: 
sl@0: 	/* we should now have
sl@0: 	 * wr->data pointing to the encrypted data, which is
sl@0: 	 * wr->length long */
sl@0: 	wr->type=type; /* not needed but helps for debugging */
sl@0: 	wr->length+=DTLS1_RT_HEADER_LENGTH;
sl@0: 
sl@0: #if 0  /* this is now done at the message layer */
sl@0: 	/* buffer the record, making it easy to handle retransmits */
sl@0: 	if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
sl@0: 		dtls1_buffer_record(s, wr->data, wr->length, 
sl@0: 			*((PQ_64BIT *)&(s->s3->write_sequence[0])));
sl@0: #endif
sl@0: 
sl@0: 	ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
sl@0: 
sl@0: 	if (create_empty_fragment)
sl@0: 		{
sl@0: 		/* we are in a recursive call;
sl@0: 		 * just return the length, don't write out anything here
sl@0: 		 */
sl@0: 		return wr->length;
sl@0: 		}
sl@0: 
sl@0: 	/* now let's set up wb */
sl@0: 	wb->left = prefix_len + wr->length;
sl@0: 	wb->offset = 0;
sl@0: 
sl@0: 	/* memorize arguments so that ssl3_write_pending can detect bad write retries later */
sl@0: 	s->s3->wpend_tot=len;
sl@0: 	s->s3->wpend_buf=buf;
sl@0: 	s->s3->wpend_type=type;
sl@0: 	s->s3->wpend_ret=len;
sl@0: 
sl@0: 	/* we now just need to write the buffer */
sl@0: 	return ssl3_write_pending(s,type,buf,len);
sl@0: err:
sl@0: 	return -1;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: 
sl@0: static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
sl@0: 	PQ_64BIT *seq_num)
sl@0: 	{
sl@0: #if PQ_64BIT_IS_INTEGER
sl@0: 	PQ_64BIT mask = 0x0000000000000001L;
sl@0: #endif
sl@0: 	PQ_64BIT rcd_num, tmp;
sl@0: 
sl@0: 	pq_64bit_init(&rcd_num);
sl@0: 	pq_64bit_init(&tmp);
sl@0: 
sl@0: 	/* this is the sequence number for the record just read */
sl@0: 	pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
sl@0: 
sl@0: 	
sl@0: 	if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
sl@0: 		pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
sl@0: 		{
sl@0: 		pq_64bit_assign(seq_num, &rcd_num);
sl@0: 		pq_64bit_free(&rcd_num);
sl@0: 		pq_64bit_free(&tmp);
sl@0: 		return 1;  /* this record is new */
sl@0: 		}
sl@0: 
sl@0: 	pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
sl@0: 
sl@0: 	if ( pq_64bit_get_word(&tmp) > bitmap->length)
sl@0: 		{
sl@0: 		pq_64bit_free(&rcd_num);
sl@0: 		pq_64bit_free(&tmp);
sl@0: 		return 0;  /* stale, outside the window */
sl@0: 		}
sl@0: 
sl@0: #if PQ_64BIT_IS_BIGNUM
sl@0: 	{
sl@0: 	int offset;
sl@0: 	pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
sl@0: 	pq_64bit_sub_word(&tmp, 1);
sl@0: 	offset = pq_64bit_get_word(&tmp);
sl@0: 	if ( pq_64bit_is_bit_set(&(bitmap->map), offset))
sl@0: 		{
sl@0: 		pq_64bit_free(&rcd_num);
sl@0: 		pq_64bit_free(&tmp);
sl@0: 		return 0;
sl@0: 		}
sl@0: 	}
sl@0: #else
sl@0: 	mask <<= (bitmap->max_seq_num - rcd_num - 1);
sl@0: 	if (bitmap->map & mask)
sl@0: 		return 0; /* record previously received */
sl@0: #endif
sl@0: 	
sl@0: 	pq_64bit_assign(seq_num, &rcd_num);
sl@0: 	pq_64bit_free(&rcd_num);
sl@0: 	pq_64bit_free(&tmp);
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
sl@0: 	{
sl@0: 	unsigned int shift;
sl@0: 	PQ_64BIT rcd_num;
sl@0: 	PQ_64BIT tmp;
sl@0: 	PQ_64BIT_CTX *ctx;
sl@0: 
sl@0: 	pq_64bit_init(&rcd_num);
sl@0: 	pq_64bit_init(&tmp);
sl@0: 
sl@0: 	pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
sl@0: 
sl@0: 	/* unfortunate code complexity due to 64-bit manipulation support
sl@0: 	 * on 32-bit machines */
sl@0: 	if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
sl@0: 		pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
sl@0: 		{
sl@0: 		pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num));
sl@0: 		pq_64bit_add_word(&tmp, 1);
sl@0: 
sl@0: 		shift = (unsigned int)pq_64bit_get_word(&tmp);
sl@0: 
sl@0: 		pq_64bit_lshift(&(tmp), &(bitmap->map), shift);
sl@0: 		pq_64bit_assign(&(bitmap->map), &tmp);
sl@0: 
sl@0: 		pq_64bit_set_bit(&(bitmap->map), 0);
sl@0: 		pq_64bit_add_word(&rcd_num, 1);
sl@0: 		pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num);
sl@0: 
sl@0: 		pq_64bit_assign_word(&tmp, 1);
sl@0: 		pq_64bit_lshift(&tmp, &tmp, bitmap->length);
sl@0: 		ctx = pq_64bit_ctx_new(&ctx);
sl@0: 		pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx);
sl@0: 		pq_64bit_ctx_free(ctx);
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
sl@0: 		pq_64bit_sub_word(&tmp, 1);
sl@0: 		shift = (unsigned int)pq_64bit_get_word(&tmp);
sl@0: 
sl@0: 		pq_64bit_set_bit(&(bitmap->map), shift);
sl@0: 		}
sl@0: 
sl@0: 	pq_64bit_free(&rcd_num);
sl@0: 	pq_64bit_free(&tmp);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: int dtls1_dispatch_alert(SSL *s)
sl@0: 	{
sl@0: 	int i,j;
sl@0: 	void (*cb)(const SSL *ssl,int type,int val)=NULL;
sl@0: 	unsigned char buf[2 + 2 + 3]; /* alert level + alert desc + message seq +frag_off */
sl@0: 	unsigned char *ptr = &buf[0];
sl@0: 
sl@0: 	s->s3->alert_dispatch=0;
sl@0: 
sl@0: 	memset(buf, 0x00, sizeof(buf));
sl@0: 	*ptr++ = s->s3->send_alert[0];
sl@0: 	*ptr++ = s->s3->send_alert[1];
sl@0: 
sl@0: 	if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
sl@0: 		{	
sl@0: 		s2n(s->d1->handshake_read_seq, ptr);
sl@0: #if 0
sl@0: 		if ( s->d1->r_msg_hdr.frag_off == 0)  /* waiting for a new msg */
sl@0: 
sl@0: 		else
sl@0: 			s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
sl@0: #endif
sl@0: 
sl@0: #if 0
sl@0: 		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);
sl@0: #endif
sl@0: 		l2n3(s->d1->r_msg_hdr.frag_off, ptr);
sl@0: 		}
sl@0: 
sl@0: 	i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
sl@0: 	if (i <= 0)
sl@0: 		{
sl@0: 		s->s3->alert_dispatch=1;
sl@0: 		/* fprintf( stderr, "not done with alert\n" ); */
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		if ( s->s3->send_alert[0] == SSL3_AL_FATAL ||
sl@0: 			s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
sl@0: 			(void)BIO_flush(s->wbio);
sl@0: 
sl@0: 		if (s->msg_callback)
sl@0: 			s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 
sl@0: 				2, s, s->msg_callback_arg);
sl@0: 
sl@0: 		if (s->info_callback != NULL)
sl@0: 			cb=s->info_callback;
sl@0: 		else if (s->ctx->info_callback != NULL)
sl@0: 			cb=s->ctx->info_callback;
sl@0: 
sl@0: 		if (cb != NULL)
sl@0: 			{
sl@0: 			j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
sl@0: 			cb(s,SSL_CB_WRITE_ALERT,j);
sl@0: 			}
sl@0: 		}
sl@0: 	return(i);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: static DTLS1_BITMAP *
sl@0: dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
sl@0:     {
sl@0:     
sl@0:     *is_next_epoch = 0;
sl@0: 
sl@0:     /* In current epoch, accept HM, CCS, DATA, & ALERT */
sl@0:     if (rr->epoch == s->d1->r_epoch)
sl@0:         return &s->d1->bitmap;
sl@0: 
sl@0:     /* Only HM and ALERT messages can be from the next epoch */
sl@0:     else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
sl@0:         (rr->type == SSL3_RT_HANDSHAKE ||
sl@0:             rr->type == SSL3_RT_ALERT))
sl@0:         {
sl@0:         *is_next_epoch = 1;
sl@0:         return &s->d1->next_bitmap;
sl@0:         }
sl@0: 
sl@0:     return NULL;
sl@0:     }
sl@0: 
sl@0: #if 0
sl@0: static int
sl@0: dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
sl@0: 	unsigned long *offset)
sl@0: 	{
sl@0: 
sl@0: 	/* alerts are passed up immediately */
sl@0: 	if ( rr->type == SSL3_RT_APPLICATION_DATA ||
sl@0: 		rr->type == SSL3_RT_ALERT)
sl@0: 		return 0;
sl@0: 
sl@0: 	/* Only need to buffer if a handshake is underway.
sl@0: 	 * (this implies that Hello Request and Client Hello are passed up
sl@0: 	 * immediately) */
sl@0: 	if ( SSL_in_init(s))
sl@0: 		{
sl@0: 		unsigned char *data = rr->data;
sl@0: 		/* need to extract the HM/CCS sequence number here */
sl@0: 		if ( rr->type == SSL3_RT_HANDSHAKE ||
sl@0: 			rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
sl@0: 			{
sl@0: 			unsigned short seq_num;
sl@0: 			struct hm_header_st msg_hdr;
sl@0: 			struct ccs_header_st ccs_hdr;
sl@0: 
sl@0: 			if ( rr->type == SSL3_RT_HANDSHAKE)
sl@0: 				{
sl@0: 				dtls1_get_message_header(data, &msg_hdr);
sl@0: 				seq_num = msg_hdr.seq;
sl@0: 				*offset = msg_hdr.frag_off;
sl@0: 				}
sl@0: 			else
sl@0: 				{
sl@0: 				dtls1_get_ccs_header(data, &ccs_hdr);
sl@0: 				seq_num = ccs_hdr.seq;
sl@0: 				*offset = 0;
sl@0: 				}
sl@0: 				
sl@0: 			/* this is either a record we're waiting for, or a
sl@0: 			 * retransmit of something we happened to previously 
sl@0: 			 * receive (higher layers will drop the repeat silently */
sl@0: 			if ( seq_num < s->d1->handshake_read_seq)
sl@0: 				return 0;
sl@0: 			if (rr->type == SSL3_RT_HANDSHAKE && 
sl@0: 				seq_num == s->d1->handshake_read_seq &&
sl@0: 				msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
sl@0: 				return 0;
sl@0: 			else if ( seq_num == s->d1->handshake_read_seq &&
sl@0: 				(rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
sl@0: 					msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
sl@0: 				return 0;
sl@0: 			else
sl@0: 				{
sl@0: 				*priority = seq_num;
sl@0: 				return 1;
sl@0: 				}
sl@0: 			}
sl@0: 		else /* unknown record type */
sl@0: 			return 0;
sl@0: 		}
sl@0: 
sl@0: 	return 0;
sl@0: 	}
sl@0: #endif
sl@0: 
sl@0: void
sl@0: dtls1_reset_seq_numbers(SSL *s, int rw)
sl@0: 	{
sl@0: 	unsigned char *seq;
sl@0: 	unsigned int seq_bytes = sizeof(s->s3->read_sequence);
sl@0: 
sl@0: 	if ( rw & SSL3_CC_READ)
sl@0: 		{
sl@0: 		seq = s->s3->read_sequence;
sl@0: 		s->d1->r_epoch++;
sl@0: 
sl@0: 		pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map));
sl@0: 		s->d1->bitmap.length = s->d1->next_bitmap.length;
sl@0: 		pq_64bit_assign(&(s->d1->bitmap.max_seq_num), 
sl@0: 			&(s->d1->next_bitmap.max_seq_num));
sl@0: 
sl@0: 		pq_64bit_free(&(s->d1->next_bitmap.map));
sl@0: 		pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
sl@0: 		memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
sl@0: 		pq_64bit_init(&(s->d1->next_bitmap.map));
sl@0: 		pq_64bit_init(&(s->d1->next_bitmap.max_seq_num));
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		seq = s->s3->write_sequence;
sl@0: 		s->d1->w_epoch++;
sl@0: 		}
sl@0: 
sl@0: 	memset(seq, 0x00, seq_bytes);
sl@0: 	}
sl@0: 
sl@0: #if PQ_64BIT_IS_INTEGER
sl@0: static PQ_64BIT
sl@0: bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num)
sl@0:        {
sl@0:        PQ_64BIT _num;
sl@0: 
sl@0:        _num = (((PQ_64BIT)bytes[0]) << 56) |
sl@0:                (((PQ_64BIT)bytes[1]) << 48) |
sl@0:                (((PQ_64BIT)bytes[2]) << 40) |
sl@0:                (((PQ_64BIT)bytes[3]) << 32) |
sl@0:                (((PQ_64BIT)bytes[4]) << 24) |
sl@0:                (((PQ_64BIT)bytes[5]) << 16) |
sl@0:                (((PQ_64BIT)bytes[6]) <<  8) |
sl@0:                (((PQ_64BIT)bytes[7])      );
sl@0: 
sl@0: 	   *num = _num ;
sl@0:        return _num;
sl@0:        }
sl@0: #endif
sl@0: 
sl@0: 
sl@0: static void
sl@0: dtls1_clear_timeouts(SSL *s)
sl@0: 	{
sl@0: 	memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));
sl@0: 	}