1778 lines
48 KiB
C
1778 lines
48 KiB
C
/* ssl/d1_pkt.c */
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/*
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* DTLS implementation written by Nagendra Modadugu
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* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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*/
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/* ====================================================================
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* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
|
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* notice, this list of conditions and the following disclaimer in the
|
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <errno.h>
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#define USE_SOCKETS
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#include "ssl_locl.h"
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#include <openssl/evp.h>
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#include <openssl/buffer.h>
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#include <openssl/pqueue.h>
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#include <openssl/rand.h>
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static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
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int len, int peek);
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static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
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PQ_64BIT *seq_num);
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static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap);
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static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
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unsigned int *is_next_epoch);
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#if 0
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static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr,
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unsigned short *priority, unsigned long *offset);
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#endif
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static int dtls1_buffer_record(SSL *s, record_pqueue *q,
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PQ_64BIT priority);
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static int dtls1_process_record(SSL *s);
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#if PQ_64BIT_IS_INTEGER
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static PQ_64BIT bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num);
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#endif
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static void dtls1_clear_timeouts(SSL *s);
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/* copy buffered record into SSL structure */
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static int
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dtls1_copy_record(SSL *s, pitem *item)
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{
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DTLS1_RECORD_DATA *rdata;
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rdata = (DTLS1_RECORD_DATA *)item->data;
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if (s->s3->rbuf.buf != NULL)
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OPENSSL_free(s->s3->rbuf.buf);
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s->packet = rdata->packet;
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s->packet_length = rdata->packet_length;
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memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
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memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
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return(1);
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}
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static int
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dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT priority)
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{
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DTLS1_RECORD_DATA *rdata;
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pitem *item;
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rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
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item = pitem_new(priority, rdata);
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if (rdata == NULL || item == NULL)
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{
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if (rdata != NULL) OPENSSL_free(rdata);
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if (item != NULL) pitem_free(item);
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SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
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return(0);
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}
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rdata->packet = s->packet;
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rdata->packet_length = s->packet_length;
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memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
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memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
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item->data = rdata;
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/* insert should not fail, since duplicates are dropped */
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if (pqueue_insert(queue->q, item) == NULL)
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{
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OPENSSL_free(rdata);
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pitem_free(item);
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return(0);
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}
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s->packet = NULL;
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s->packet_length = 0;
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memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
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memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
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if (!ssl3_setup_buffers(s))
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{
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SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
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OPENSSL_free(rdata);
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pitem_free(item);
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return(0);
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}
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return(1);
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}
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static int
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dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
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{
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pitem *item;
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item = pqueue_pop(queue->q);
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if (item)
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{
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dtls1_copy_record(s, item);
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OPENSSL_free(item->data);
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pitem_free(item);
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return(1);
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}
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return(0);
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}
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/* retrieve a buffered record that belongs to the new epoch, i.e., not processed
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* yet */
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#define dtls1_get_unprocessed_record(s) \
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dtls1_retrieve_buffered_record((s), \
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&((s)->d1->unprocessed_rcds))
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/* retrieve a buffered record that belongs to the current epoch, ie, processed */
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#define dtls1_get_processed_record(s) \
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dtls1_retrieve_buffered_record((s), \
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&((s)->d1->processed_rcds))
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static int
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dtls1_process_buffered_records(SSL *s)
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{
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pitem *item;
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item = pqueue_peek(s->d1->unprocessed_rcds.q);
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if (item)
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{
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DTLS1_RECORD_DATA *rdata;
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rdata = (DTLS1_RECORD_DATA *)item->data;
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/* Check if epoch is current. */
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if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
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return(1); /* Nothing to do. */
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/* Process all the records. */
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while (pqueue_peek(s->d1->unprocessed_rcds.q))
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{
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dtls1_get_unprocessed_record(s);
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if ( ! dtls1_process_record(s))
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return(0);
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dtls1_buffer_record(s, &(s->d1->processed_rcds),
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s->s3->rrec.seq_num);
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}
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}
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/* sync epoch numbers once all the unprocessed records
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* have been processed */
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s->d1->processed_rcds.epoch = s->d1->r_epoch;
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s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
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return(1);
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}
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#if 0
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static int
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dtls1_get_buffered_record(SSL *s)
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{
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pitem *item;
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PQ_64BIT priority =
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(((PQ_64BIT)s->d1->handshake_read_seq) << 32) |
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((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
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if ( ! SSL_in_init(s)) /* if we're not (re)negotiating,
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nothing buffered */
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return 0;
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item = pqueue_peek(s->d1->rcvd_records);
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if (item && item->priority == priority)
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{
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/* Check if we've received the record of interest. It must be
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* a handshake record, since data records as passed up without
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* buffering */
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DTLS1_RECORD_DATA *rdata;
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item = pqueue_pop(s->d1->rcvd_records);
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rdata = (DTLS1_RECORD_DATA *)item->data;
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if (s->s3->rbuf.buf != NULL)
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OPENSSL_free(s->s3->rbuf.buf);
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s->packet = rdata->packet;
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s->packet_length = rdata->packet_length;
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memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
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memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
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OPENSSL_free(item->data);
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pitem_free(item);
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/* s->d1->next_expected_seq_num++; */
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return(1);
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}
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return 0;
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}
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#endif
|
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static int
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dtls1_process_record(SSL *s)
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{
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int i,al;
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int clear=0;
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int enc_err;
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SSL_SESSION *sess;
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SSL3_RECORD *rr;
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unsigned int mac_size;
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unsigned char md[EVP_MAX_MD_SIZE];
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rr= &(s->s3->rrec);
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sess = s->session;
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/* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
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* and we have that many bytes in s->packet
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*/
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rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
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|
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/* ok, we can now read from 's->packet' data into 'rr'
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* rr->input points at rr->length bytes, which
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* need to be copied into rr->data by either
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* the decryption or by the decompression
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* When the data is 'copied' into the rr->data buffer,
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* rr->input will be pointed at the new buffer */
|
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|
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/* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
|
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* rr->length bytes of encrypted compressed stuff. */
|
|
|
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/* check is not needed I believe */
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if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
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{
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al=SSL_AD_RECORD_OVERFLOW;
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SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
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goto f_err;
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}
|
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|
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/* decrypt in place in 'rr->input' */
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rr->data=rr->input;
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enc_err = s->method->ssl3_enc->enc(s,0);
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if (enc_err <= 0)
|
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{
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if (enc_err == 0)
|
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/* SSLerr() and ssl3_send_alert() have been called */
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goto err;
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|
|
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/* otherwise enc_err == -1 */
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goto decryption_failed_or_bad_record_mac;
|
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}
|
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|
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#ifdef TLS_DEBUG
|
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printf("dec %d\n",rr->length);
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{ unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
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printf("\n");
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#endif
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|
|
/* r->length is now the compressed data plus mac */
|
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if ( (sess == NULL) ||
|
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(s->enc_read_ctx == NULL) ||
|
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(s->read_hash == NULL))
|
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clear=1;
|
|
|
|
if (!clear)
|
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{
|
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mac_size=EVP_MD_size(s->read_hash);
|
|
|
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if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
|
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{
|
|
#if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
|
|
al=SSL_AD_RECORD_OVERFLOW;
|
|
SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
|
|
goto f_err;
|
|
#else
|
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goto decryption_failed_or_bad_record_mac;
|
|
#endif
|
|
}
|
|
/* check the MAC for rr->input (it's in mac_size bytes at the tail) */
|
|
if (rr->length < mac_size)
|
|
{
|
|
#if 0 /* OK only for stream ciphers */
|
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al=SSL_AD_DECODE_ERROR;
|
|
SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_LENGTH_TOO_SHORT);
|
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goto f_err;
|
|
#else
|
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goto decryption_failed_or_bad_record_mac;
|
|
#endif
|
|
}
|
|
rr->length-=mac_size;
|
|
i=s->method->ssl3_enc->mac(s,md,0);
|
|
if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
|
|
{
|
|
goto decryption_failed_or_bad_record_mac;
|
|
}
|
|
}
|
|
|
|
/* r->length is now just compressed */
|
|
if (s->expand != NULL)
|
|
{
|
|
if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH)
|
|
{
|
|
al=SSL_AD_RECORD_OVERFLOW;
|
|
SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
|
|
goto f_err;
|
|
}
|
|
if (!ssl3_do_uncompress(s))
|
|
{
|
|
al=SSL_AD_DECOMPRESSION_FAILURE;
|
|
SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_BAD_DECOMPRESSION);
|
|
goto f_err;
|
|
}
|
|
}
|
|
|
|
if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH)
|
|
{
|
|
al=SSL_AD_RECORD_OVERFLOW;
|
|
SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
|
|
goto f_err;
|
|
}
|
|
|
|
rr->off=0;
|
|
/* So at this point the following is true
|
|
* ssl->s3->rrec.type is the type of record
|
|
* ssl->s3->rrec.length == number of bytes in record
|
|
* ssl->s3->rrec.off == offset to first valid byte
|
|
* ssl->s3->rrec.data == where to take bytes from, increment
|
|
* after use :-).
|
|
*/
|
|
|
|
/* we have pulled in a full packet so zero things */
|
|
s->packet_length=0;
|
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dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
|
|
return(1);
|
|
|
|
decryption_failed_or_bad_record_mac:
|
|
/* Separate 'decryption_failed' alert was introduced with TLS 1.0,
|
|
* SSL 3.0 only has 'bad_record_mac'. But unless a decryption
|
|
* failure is directly visible from the ciphertext anyway,
|
|
* we should not reveal which kind of error occured -- this
|
|
* might become visible to an attacker (e.g. via logfile) */
|
|
al=SSL_AD_BAD_RECORD_MAC;
|
|
SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
|
|
f_err:
|
|
ssl3_send_alert(s,SSL3_AL_FATAL,al);
|
|
err:
|
|
return(0);
|
|
}
|
|
|
|
|
|
/* Call this to get a new input record.
|
|
* It will return <= 0 if more data is needed, normally due to an error
|
|
* or non-blocking IO.
|
|
* When it finishes, one packet has been decoded and can be found in
|
|
* ssl->s3->rrec.type - is the type of record
|
|
* ssl->s3->rrec.data, - data
|
|
* ssl->s3->rrec.length, - number of bytes
|
|
*/
|
|
/* used only by dtls1_read_bytes */
|
|
int dtls1_get_record(SSL *s)
|
|
{
|
|
int ssl_major,ssl_minor,al;
|
|
int i,n;
|
|
SSL3_RECORD *rr;
|
|
SSL_SESSION *sess;
|
|
unsigned char *p;
|
|
unsigned short version;
|
|
DTLS1_BITMAP *bitmap;
|
|
unsigned int is_next_epoch;
|
|
|
|
rr= &(s->s3->rrec);
|
|
sess=s->session;
|
|
|
|
/* The epoch may have changed. If so, process all the
|
|
* pending records. This is a non-blocking operation. */
|
|
if ( ! dtls1_process_buffered_records(s))
|
|
return 0;
|
|
|
|
/* if we're renegotiating, then there may be buffered records */
|
|
if (dtls1_get_processed_record(s))
|
|
return 1;
|
|
|
|
/* get something from the wire */
|
|
again:
|
|
/* check if we have the header */
|
|
if ( (s->rstate != SSL_ST_READ_BODY) ||
|
|
(s->packet_length < DTLS1_RT_HEADER_LENGTH))
|
|
{
|
|
n=ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
|
|
/* read timeout is handled by dtls1_read_bytes */
|
|
if (n <= 0) return(n); /* error or non-blocking */
|
|
|
|
OPENSSL_assert(s->packet_length == DTLS1_RT_HEADER_LENGTH);
|
|
|
|
s->rstate=SSL_ST_READ_BODY;
|
|
|
|
p=s->packet;
|
|
|
|
/* Pull apart the header into the DTLS1_RECORD */
|
|
rr->type= *(p++);
|
|
ssl_major= *(p++);
|
|
ssl_minor= *(p++);
|
|
version=(ssl_major<<8)|ssl_minor;
|
|
|
|
/* sequence number is 64 bits, with top 2 bytes = epoch */
|
|
n2s(p,rr->epoch);
|
|
|
|
memcpy(&(s->s3->read_sequence[2]), p, 6);
|
|
p+=6;
|
|
|
|
n2s(p,rr->length);
|
|
|
|
/* Lets check version */
|
|
if (!s->first_packet)
|
|
{
|
|
if (version != s->version && version != DTLS1_BAD_VER)
|
|
{
|
|
SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
|
|
/* Send back error using their
|
|
* version number :-) */
|
|
s->version=version;
|
|
al=SSL_AD_PROTOCOL_VERSION;
|
|
goto f_err;
|
|
}
|
|
}
|
|
|
|
if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
|
|
(version & 0xff00) != (DTLS1_BAD_VER & 0xff00))
|
|
{
|
|
SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
|
|
goto err;
|
|
}
|
|
|
|
if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
|
|
{
|
|
al=SSL_AD_RECORD_OVERFLOW;
|
|
SSLerr(SSL_F_DTLS1_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
|
|
goto f_err;
|
|
}
|
|
|
|
s->client_version = version;
|
|
/* now s->rstate == SSL_ST_READ_BODY */
|
|
}
|
|
|
|
/* s->rstate == SSL_ST_READ_BODY, get and decode the data */
|
|
|
|
if (rr->length > s->packet_length-DTLS1_RT_HEADER_LENGTH)
|
|
{
|
|
/* now s->packet_length == DTLS1_RT_HEADER_LENGTH */
|
|
i=rr->length;
|
|
n=ssl3_read_n(s,i,i,1);
|
|
if (n <= 0) return(n); /* error or non-blocking io */
|
|
|
|
/* this packet contained a partial record, dump it */
|
|
if ( n != i)
|
|
{
|
|
s->packet_length = 0;
|
|
goto again;
|
|
}
|
|
|
|
/* now n == rr->length,
|
|
* and s->packet_length == DTLS1_RT_HEADER_LENGTH + rr->length */
|
|
}
|
|
s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
|
|
|
|
/* match epochs. NULL means the packet is dropped on the floor */
|
|
bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch);
|
|
if ( bitmap == NULL)
|
|
{
|
|
s->packet_length = 0; /* dump this record */
|
|
goto again; /* get another record */
|
|
}
|
|
|
|
/* check whether this is a repeat, or aged record */
|
|
if ( ! dtls1_record_replay_check(s, bitmap, &(rr->seq_num)))
|
|
{
|
|
s->packet_length=0; /* dump this record */
|
|
goto again; /* get another record */
|
|
}
|
|
|
|
/* just read a 0 length packet */
|
|
if (rr->length == 0) goto again;
|
|
|
|
/* If this record is from the next epoch (either HM or ALERT), buffer it
|
|
* since it cannot be processed at this time.
|
|
* Records from the next epoch are marked as received even though they are
|
|
* not processed, so as to prevent any potential resource DoS attack */
|
|
if (is_next_epoch)
|
|
{
|
|
dtls1_record_bitmap_update(s, bitmap);
|
|
dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num);
|
|
s->packet_length = 0;
|
|
goto again;
|
|
}
|
|
|
|
if ( ! dtls1_process_record(s))
|
|
return(0);
|
|
|
|
dtls1_clear_timeouts(s); /* done waiting */
|
|
return(1);
|
|
|
|
f_err:
|
|
ssl3_send_alert(s,SSL3_AL_FATAL,al);
|
|
err:
|
|
return(0);
|
|
}
|
|
|
|
/* Return up to 'len' payload bytes received in 'type' records.
|
|
* 'type' is one of the following:
|
|
*
|
|
* - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
|
|
* - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
|
|
* - 0 (during a shutdown, no data has to be returned)
|
|
*
|
|
* If we don't have stored data to work from, read a SSL/TLS record first
|
|
* (possibly multiple records if we still don't have anything to return).
|
|
*
|
|
* This function must handle any surprises the peer may have for us, such as
|
|
* Alert records (e.g. close_notify), ChangeCipherSpec records (not really
|
|
* a surprise, but handled as if it were), or renegotiation requests.
|
|
* Also if record payloads contain fragments too small to process, we store
|
|
* them until there is enough for the respective protocol (the record protocol
|
|
* may use arbitrary fragmentation and even interleaving):
|
|
* Change cipher spec protocol
|
|
* just 1 byte needed, no need for keeping anything stored
|
|
* Alert protocol
|
|
* 2 bytes needed (AlertLevel, AlertDescription)
|
|
* Handshake protocol
|
|
* 4 bytes needed (HandshakeType, uint24 length) -- we just have
|
|
* to detect unexpected Client Hello and Hello Request messages
|
|
* here, anything else is handled by higher layers
|
|
* Application data protocol
|
|
* none of our business
|
|
*/
|
|
int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
|
|
{
|
|
int al,i,j,ret;
|
|
unsigned int n;
|
|
SSL3_RECORD *rr;
|
|
void (*cb)(const SSL *ssl,int type2,int val)=NULL;
|
|
|
|
if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
|
|
if (!ssl3_setup_buffers(s))
|
|
return(-1);
|
|
|
|
/* XXX: check what the second '&& type' is about */
|
|
if ((type && (type != SSL3_RT_APPLICATION_DATA) &&
|
|
(type != SSL3_RT_HANDSHAKE) && type) ||
|
|
(peek && (type != SSL3_RT_APPLICATION_DATA)))
|
|
{
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR);
|
|
return -1;
|
|
}
|
|
|
|
/* check whether there's a handshake message (client hello?) waiting */
|
|
if ( (ret = have_handshake_fragment(s, type, buf, len, peek)))
|
|
return ret;
|
|
|
|
/* Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
|
|
|
|
if (!s->in_handshake && SSL_in_init(s))
|
|
{
|
|
/* type == SSL3_RT_APPLICATION_DATA */
|
|
i=s->handshake_func(s);
|
|
if (i < 0) return(i);
|
|
if (i == 0)
|
|
{
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
return(-1);
|
|
}
|
|
}
|
|
|
|
start:
|
|
s->rwstate=SSL_NOTHING;
|
|
|
|
/* s->s3->rrec.type - is the type of record
|
|
* s->s3->rrec.data, - data
|
|
* s->s3->rrec.off, - offset into 'data' for next read
|
|
* s->s3->rrec.length, - number of bytes. */
|
|
rr = &(s->s3->rrec);
|
|
|
|
/* get new packet if necessary */
|
|
if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
|
|
{
|
|
ret=dtls1_get_record(s);
|
|
if (ret <= 0)
|
|
{
|
|
ret = dtls1_read_failed(s, ret);
|
|
/* anything other than a timeout is an error */
|
|
if (ret <= 0)
|
|
return(ret);
|
|
else
|
|
goto start;
|
|
}
|
|
}
|
|
|
|
/* we now have a packet which can be read and processed */
|
|
|
|
if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
|
|
* reset by ssl3_get_finished */
|
|
&& (rr->type != SSL3_RT_HANDSHAKE))
|
|
{
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
|
|
goto err;
|
|
}
|
|
|
|
/* If the other end has shut down, throw anything we read away
|
|
* (even in 'peek' mode) */
|
|
if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
|
|
{
|
|
rr->length=0;
|
|
s->rwstate=SSL_NOTHING;
|
|
return(0);
|
|
}
|
|
|
|
|
|
if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
|
|
{
|
|
/* make sure that we are not getting application data when we
|
|
* are doing a handshake for the first time */
|
|
if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
|
|
(s->enc_read_ctx == NULL))
|
|
{
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
|
|
goto f_err;
|
|
}
|
|
|
|
if (len <= 0) return(len);
|
|
|
|
if ((unsigned int)len > rr->length)
|
|
n = rr->length;
|
|
else
|
|
n = (unsigned int)len;
|
|
|
|
memcpy(buf,&(rr->data[rr->off]),n);
|
|
if (!peek)
|
|
{
|
|
rr->length-=n;
|
|
rr->off+=n;
|
|
if (rr->length == 0)
|
|
{
|
|
s->rstate=SSL_ST_READ_HEADER;
|
|
rr->off=0;
|
|
}
|
|
}
|
|
return(n);
|
|
}
|
|
|
|
|
|
/* If we get here, then type != rr->type; if we have a handshake
|
|
* message, then it was unexpected (Hello Request or Client Hello). */
|
|
|
|
/* In case of record types for which we have 'fragment' storage,
|
|
* fill that so that we can process the data at a fixed place.
|
|
*/
|
|
{
|
|
unsigned int k, dest_maxlen = 0;
|
|
unsigned char *dest = NULL;
|
|
unsigned int *dest_len = NULL;
|
|
|
|
if (rr->type == SSL3_RT_HANDSHAKE)
|
|
{
|
|
dest_maxlen = sizeof s->d1->handshake_fragment;
|
|
dest = s->d1->handshake_fragment;
|
|
dest_len = &s->d1->handshake_fragment_len;
|
|
}
|
|
else if (rr->type == SSL3_RT_ALERT)
|
|
{
|
|
dest_maxlen = sizeof(s->d1->alert_fragment);
|
|
dest = s->d1->alert_fragment;
|
|
dest_len = &s->d1->alert_fragment_len;
|
|
}
|
|
/* else it's a CCS message, or it's wrong */
|
|
else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
|
|
{
|
|
/* Not certain if this is the right error handling */
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
|
|
goto f_err;
|
|
}
|
|
|
|
|
|
if (dest_maxlen > 0)
|
|
{
|
|
/* XDTLS: In a pathalogical case, the Client Hello
|
|
* may be fragmented--don't always expect dest_maxlen bytes */
|
|
if ( rr->length < dest_maxlen)
|
|
{
|
|
s->rstate=SSL_ST_READ_HEADER;
|
|
rr->length = 0;
|
|
goto start;
|
|
}
|
|
|
|
/* now move 'n' bytes: */
|
|
for ( k = 0; k < dest_maxlen; k++)
|
|
{
|
|
dest[k] = rr->data[rr->off++];
|
|
rr->length--;
|
|
}
|
|
*dest_len = dest_maxlen;
|
|
}
|
|
}
|
|
|
|
/* s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE;
|
|
* s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT.
|
|
* (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
|
|
|
|
/* If we are a client, check for an incoming 'Hello Request': */
|
|
if ((!s->server) &&
|
|
(s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
|
|
(s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
|
|
(s->session != NULL) && (s->session->cipher != NULL))
|
|
{
|
|
s->d1->handshake_fragment_len = 0;
|
|
|
|
if ((s->d1->handshake_fragment[1] != 0) ||
|
|
(s->d1->handshake_fragment[2] != 0) ||
|
|
(s->d1->handshake_fragment[3] != 0))
|
|
{
|
|
al=SSL_AD_DECODE_ERROR;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
|
|
goto err;
|
|
}
|
|
|
|
/* no need to check sequence number on HELLO REQUEST messages */
|
|
|
|
if (s->msg_callback)
|
|
s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
|
|
s->d1->handshake_fragment, 4, s, s->msg_callback_arg);
|
|
|
|
if (SSL_is_init_finished(s) &&
|
|
!(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
|
|
!s->s3->renegotiate)
|
|
{
|
|
ssl3_renegotiate(s);
|
|
if (ssl3_renegotiate_check(s))
|
|
{
|
|
i=s->handshake_func(s);
|
|
if (i < 0) return(i);
|
|
if (i == 0)
|
|
{
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
return(-1);
|
|
}
|
|
|
|
if (!(s->mode & SSL_MODE_AUTO_RETRY))
|
|
{
|
|
if (s->s3->rbuf.left == 0) /* no read-ahead left? */
|
|
{
|
|
BIO *bio;
|
|
/* In the case where we try to read application data,
|
|
* but we trigger an SSL handshake, we return -1 with
|
|
* the retry option set. Otherwise renegotiation may
|
|
* cause nasty problems in the blocking world */
|
|
s->rwstate=SSL_READING;
|
|
bio=SSL_get_rbio(s);
|
|
BIO_clear_retry_flags(bio);
|
|
BIO_set_retry_read(bio);
|
|
return(-1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/* we either finished a handshake or ignored the request,
|
|
* now try again to obtain the (application) data we were asked for */
|
|
goto start;
|
|
}
|
|
|
|
if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH)
|
|
{
|
|
int alert_level = s->d1->alert_fragment[0];
|
|
int alert_descr = s->d1->alert_fragment[1];
|
|
|
|
s->d1->alert_fragment_len = 0;
|
|
|
|
if (s->msg_callback)
|
|
s->msg_callback(0, s->version, SSL3_RT_ALERT,
|
|
s->d1->alert_fragment, 2, s, s->msg_callback_arg);
|
|
|
|
if (s->info_callback != NULL)
|
|
cb=s->info_callback;
|
|
else if (s->ctx->info_callback != NULL)
|
|
cb=s->ctx->info_callback;
|
|
|
|
if (cb != NULL)
|
|
{
|
|
j = (alert_level << 8) | alert_descr;
|
|
cb(s, SSL_CB_READ_ALERT, j);
|
|
}
|
|
|
|
if (alert_level == 1) /* warning */
|
|
{
|
|
s->s3->warn_alert = alert_descr;
|
|
if (alert_descr == SSL_AD_CLOSE_NOTIFY)
|
|
{
|
|
s->shutdown |= SSL_RECEIVED_SHUTDOWN;
|
|
return(0);
|
|
}
|
|
#if 0
|
|
/* XXX: this is a possible improvement in the future */
|
|
/* now check if it's a missing record */
|
|
if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
|
|
{
|
|
unsigned short seq;
|
|
unsigned int frag_off;
|
|
unsigned char *p = &(s->d1->alert_fragment[2]);
|
|
|
|
n2s(p, seq);
|
|
n2l3(p, frag_off);
|
|
|
|
dtls1_retransmit_message(s, seq, frag_off, &found);
|
|
if ( ! found && SSL_in_init(s))
|
|
{
|
|
/* fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */
|
|
/* requested a message not yet sent,
|
|
send an alert ourselves */
|
|
ssl3_send_alert(s,SSL3_AL_WARNING,
|
|
DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
else if (alert_level == 2) /* fatal */
|
|
{
|
|
char tmp[16];
|
|
|
|
s->rwstate=SSL_NOTHING;
|
|
s->s3->fatal_alert = alert_descr;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
|
|
BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
|
|
ERR_add_error_data(2,"SSL alert number ",tmp);
|
|
s->shutdown|=SSL_RECEIVED_SHUTDOWN;
|
|
SSL_CTX_remove_session(s->ctx,s->session);
|
|
return(0);
|
|
}
|
|
else
|
|
{
|
|
al=SSL_AD_ILLEGAL_PARAMETER;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
|
|
goto f_err;
|
|
}
|
|
|
|
goto start;
|
|
}
|
|
|
|
if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
|
|
{
|
|
s->rwstate=SSL_NOTHING;
|
|
rr->length=0;
|
|
return(0);
|
|
}
|
|
|
|
if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
|
|
{
|
|
struct ccs_header_st ccs_hdr;
|
|
|
|
dtls1_get_ccs_header(rr->data, &ccs_hdr);
|
|
|
|
/* 'Change Cipher Spec' is just a single byte, so we know
|
|
* exactly what the record payload has to look like */
|
|
/* XDTLS: check that epoch is consistent */
|
|
if ( (s->client_version == DTLS1_BAD_VER && rr->length != 3) ||
|
|
(s->client_version != DTLS1_BAD_VER && rr->length != DTLS1_CCS_HEADER_LENGTH) ||
|
|
(rr->off != 0) || (rr->data[0] != SSL3_MT_CCS))
|
|
{
|
|
i=SSL_AD_ILLEGAL_PARAMETER;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
|
|
goto err;
|
|
}
|
|
|
|
rr->length=0;
|
|
|
|
if (s->msg_callback)
|
|
s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
|
|
rr->data, 1, s, s->msg_callback_arg);
|
|
|
|
s->s3->change_cipher_spec=1;
|
|
if (!ssl3_do_change_cipher_spec(s))
|
|
goto err;
|
|
|
|
/* do this whenever CCS is processed */
|
|
dtls1_reset_seq_numbers(s, SSL3_CC_READ);
|
|
|
|
if (s->client_version == DTLS1_BAD_VER)
|
|
s->d1->handshake_read_seq++;
|
|
|
|
goto start;
|
|
}
|
|
|
|
/* Unexpected handshake message (Client Hello, or protocol violation) */
|
|
if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) &&
|
|
!s->in_handshake)
|
|
{
|
|
struct hm_header_st msg_hdr;
|
|
|
|
/* this may just be a stale retransmit */
|
|
dtls1_get_message_header(rr->data, &msg_hdr);
|
|
if( rr->epoch != s->d1->r_epoch)
|
|
{
|
|
rr->length = 0;
|
|
goto start;
|
|
}
|
|
|
|
if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
|
|
!(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
|
|
{
|
|
#if 0 /* worked only because C operator preferences are not as expected (and
|
|
* because this is not really needed for clients except for detecting
|
|
* protocol violations): */
|
|
s->state=SSL_ST_BEFORE|(s->server)
|
|
?SSL_ST_ACCEPT
|
|
:SSL_ST_CONNECT;
|
|
#else
|
|
s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
|
|
#endif
|
|
s->new_session=1;
|
|
}
|
|
i=s->handshake_func(s);
|
|
if (i < 0) return(i);
|
|
if (i == 0)
|
|
{
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
return(-1);
|
|
}
|
|
|
|
if (!(s->mode & SSL_MODE_AUTO_RETRY))
|
|
{
|
|
if (s->s3->rbuf.left == 0) /* no read-ahead left? */
|
|
{
|
|
BIO *bio;
|
|
/* In the case where we try to read application data,
|
|
* but we trigger an SSL handshake, we return -1 with
|
|
* the retry option set. Otherwise renegotiation may
|
|
* cause nasty problems in the blocking world */
|
|
s->rwstate=SSL_READING;
|
|
bio=SSL_get_rbio(s);
|
|
BIO_clear_retry_flags(bio);
|
|
BIO_set_retry_read(bio);
|
|
return(-1);
|
|
}
|
|
}
|
|
goto start;
|
|
}
|
|
|
|
switch (rr->type)
|
|
{
|
|
default:
|
|
#ifndef OPENSSL_NO_TLS
|
|
/* TLS just ignores unknown message types */
|
|
if (s->version == TLS1_VERSION)
|
|
{
|
|
rr->length = 0;
|
|
goto start;
|
|
}
|
|
#endif
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
|
|
goto f_err;
|
|
case SSL3_RT_CHANGE_CIPHER_SPEC:
|
|
case SSL3_RT_ALERT:
|
|
case SSL3_RT_HANDSHAKE:
|
|
/* we already handled all of these, with the possible exception
|
|
* of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
|
|
* should not happen when type != rr->type */
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,ERR_R_INTERNAL_ERROR);
|
|
goto f_err;
|
|
case SSL3_RT_APPLICATION_DATA:
|
|
/* At this point, we were expecting handshake data,
|
|
* but have application data. If the library was
|
|
* running inside ssl3_read() (i.e. in_read_app_data
|
|
* is set) and it makes sense to read application data
|
|
* at this point (session renegotiation not yet started),
|
|
* we will indulge it.
|
|
*/
|
|
if (s->s3->in_read_app_data &&
|
|
(s->s3->total_renegotiations != 0) &&
|
|
((
|
|
(s->state & SSL_ST_CONNECT) &&
|
|
(s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
|
|
(s->state <= SSL3_ST_CR_SRVR_HELLO_A)
|
|
) || (
|
|
(s->state & SSL_ST_ACCEPT) &&
|
|
(s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
|
|
(s->state >= SSL3_ST_SR_CLNT_HELLO_A)
|
|
)
|
|
))
|
|
{
|
|
s->s3->in_read_app_data=2;
|
|
return(-1);
|
|
}
|
|
else
|
|
{
|
|
al=SSL_AD_UNEXPECTED_MESSAGE;
|
|
SSLerr(SSL_F_DTLS1_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
|
|
goto f_err;
|
|
}
|
|
}
|
|
/* not reached */
|
|
|
|
f_err:
|
|
ssl3_send_alert(s,SSL3_AL_FATAL,al);
|
|
err:
|
|
return(-1);
|
|
}
|
|
|
|
int
|
|
dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len)
|
|
{
|
|
unsigned int n,tot;
|
|
int i;
|
|
|
|
if (SSL_in_init(s) && !s->in_handshake)
|
|
{
|
|
i=s->handshake_func(s);
|
|
if (i < 0) return(i);
|
|
if (i == 0)
|
|
{
|
|
SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
tot = s->s3->wnum;
|
|
n = len - tot;
|
|
|
|
while( n)
|
|
{
|
|
/* dtls1_write_bytes sends one record at a time, sized according to
|
|
* the currently known MTU */
|
|
i = dtls1_write_bytes(s, type, buf_, len);
|
|
if (i <= 0) return i;
|
|
|
|
if ((i == (int)n) ||
|
|
(type == SSL3_RT_APPLICATION_DATA &&
|
|
(s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
|
|
{
|
|
/* next chunk of data should get another prepended empty fragment
|
|
* in ciphersuites with known-IV weakness: */
|
|
s->s3->empty_fragment_done = 0;
|
|
return tot+i;
|
|
}
|
|
|
|
tot += i;
|
|
n-=i;
|
|
}
|
|
|
|
return tot;
|
|
}
|
|
|
|
|
|
/* this only happens when a client hello is received and a handshake
|
|
* is started. */
|
|
static int
|
|
have_handshake_fragment(SSL *s, int type, unsigned char *buf,
|
|
int len, int peek)
|
|
{
|
|
|
|
if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0))
|
|
/* (partially) satisfy request from storage */
|
|
{
|
|
unsigned char *src = s->d1->handshake_fragment;
|
|
unsigned char *dst = buf;
|
|
unsigned int k,n;
|
|
|
|
/* peek == 0 */
|
|
n = 0;
|
|
while ((len > 0) && (s->d1->handshake_fragment_len > 0))
|
|
{
|
|
*dst++ = *src++;
|
|
len--; s->d1->handshake_fragment_len--;
|
|
n++;
|
|
}
|
|
/* move any remaining fragment bytes: */
|
|
for (k = 0; k < s->d1->handshake_fragment_len; k++)
|
|
s->d1->handshake_fragment[k] = *src++;
|
|
return n;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Call this to write data in records of type 'type'
|
|
* It will return <= 0 if not all data has been sent or non-blocking IO.
|
|
*/
|
|
int dtls1_write_bytes(SSL *s, int type, const void *buf_, int len)
|
|
{
|
|
const unsigned char *buf=buf_;
|
|
unsigned int tot,n,nw;
|
|
int i;
|
|
unsigned int mtu;
|
|
|
|
s->rwstate=SSL_NOTHING;
|
|
tot=s->s3->wnum;
|
|
|
|
n=(len-tot);
|
|
|
|
/* handshake layer figures out MTU for itself, but data records
|
|
* are also sent through this interface, so need to figure out MTU */
|
|
#if 0
|
|
mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_MTU, 0, NULL);
|
|
mtu += DTLS1_HM_HEADER_LENGTH; /* HM already inserted */
|
|
#endif
|
|
mtu = s->d1->mtu;
|
|
|
|
if (mtu > SSL3_RT_MAX_PLAIN_LENGTH)
|
|
mtu = SSL3_RT_MAX_PLAIN_LENGTH;
|
|
|
|
if (n > mtu)
|
|
nw=mtu;
|
|
else
|
|
nw=n;
|
|
|
|
i=do_dtls1_write(s, type, &(buf[tot]), nw, 0);
|
|
if (i <= 0)
|
|
{
|
|
s->s3->wnum=tot;
|
|
return i;
|
|
}
|
|
|
|
if ( (int)s->s3->wnum + i == len)
|
|
s->s3->wnum = 0;
|
|
else
|
|
s->s3->wnum += i;
|
|
|
|
return tot + i;
|
|
}
|
|
|
|
int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment)
|
|
{
|
|
unsigned char *p,*pseq;
|
|
int i,mac_size,clear=0;
|
|
int prefix_len = 0;
|
|
SSL3_RECORD *wr;
|
|
SSL3_BUFFER *wb;
|
|
SSL_SESSION *sess;
|
|
int bs;
|
|
|
|
/* first check if there is a SSL3_BUFFER still being written
|
|
* out. This will happen with non blocking IO */
|
|
if (s->s3->wbuf.left != 0)
|
|
{
|
|
OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */
|
|
return(ssl3_write_pending(s,type,buf,len));
|
|
}
|
|
|
|
/* If we have an alert to send, lets send it */
|
|
if (s->s3->alert_dispatch)
|
|
{
|
|
i=s->method->ssl_dispatch_alert(s);
|
|
if (i <= 0)
|
|
return(i);
|
|
/* if it went, fall through and send more stuff */
|
|
}
|
|
|
|
if (len == 0 && !create_empty_fragment)
|
|
return 0;
|
|
|
|
wr= &(s->s3->wrec);
|
|
wb= &(s->s3->wbuf);
|
|
sess=s->session;
|
|
|
|
if ( (sess == NULL) ||
|
|
(s->enc_write_ctx == NULL) ||
|
|
(s->write_hash == NULL))
|
|
clear=1;
|
|
|
|
if (clear)
|
|
mac_size=0;
|
|
else
|
|
mac_size=EVP_MD_size(s->write_hash);
|
|
|
|
/* DTLS implements explicit IV, so no need for empty fragments */
|
|
#if 0
|
|
/* 'create_empty_fragment' is true only when this function calls itself */
|
|
if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done
|
|
&& SSL_version(s) != DTLS1_VERSION)
|
|
{
|
|
/* countermeasure against known-IV weakness in CBC ciphersuites
|
|
* (see http://www.openssl.org/~bodo/tls-cbc.txt)
|
|
*/
|
|
|
|
if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
|
|
{
|
|
/* recursive function call with 'create_empty_fragment' set;
|
|
* this prepares and buffers the data for an empty fragment
|
|
* (these 'prefix_len' bytes are sent out later
|
|
* together with the actual payload) */
|
|
prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1);
|
|
if (prefix_len <= 0)
|
|
goto err;
|
|
|
|
if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE)
|
|
{
|
|
/* insufficient space */
|
|
SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
s->s3->empty_fragment_done = 1;
|
|
}
|
|
#endif
|
|
|
|
p = wb->buf + prefix_len;
|
|
|
|
/* write the header */
|
|
|
|
*(p++)=type&0xff;
|
|
wr->type=type;
|
|
|
|
if (s->client_version == DTLS1_BAD_VER)
|
|
*(p++) = DTLS1_BAD_VER>>8,
|
|
*(p++) = DTLS1_BAD_VER&0xff;
|
|
else
|
|
*(p++)=(s->version>>8),
|
|
*(p++)=s->version&0xff;
|
|
|
|
/* field where we are to write out packet epoch, seq num and len */
|
|
pseq=p;
|
|
p+=10;
|
|
|
|
/* lets setup the record stuff. */
|
|
|
|
/* Make space for the explicit IV in case of CBC.
|
|
* (this is a bit of a boundary violation, but what the heck).
|
|
*/
|
|
if ( s->enc_write_ctx &&
|
|
(EVP_CIPHER_mode( s->enc_write_ctx->cipher ) & EVP_CIPH_CBC_MODE))
|
|
bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
|
|
else
|
|
bs = 0;
|
|
|
|
wr->data=p + bs; /* make room for IV in case of CBC */
|
|
wr->length=(int)len;
|
|
wr->input=(unsigned char *)buf;
|
|
|
|
/* we now 'read' from wr->input, wr->length bytes into
|
|
* wr->data */
|
|
|
|
/* first we compress */
|
|
if (s->compress != NULL)
|
|
{
|
|
if (!ssl3_do_compress(s))
|
|
{
|
|
SSLerr(SSL_F_DO_DTLS1_WRITE,SSL_R_COMPRESSION_FAILURE);
|
|
goto err;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
memcpy(wr->data,wr->input,wr->length);
|
|
wr->input=wr->data;
|
|
}
|
|
|
|
/* we should still have the output to wr->data and the input
|
|
* from wr->input. Length should be wr->length.
|
|
* wr->data still points in the wb->buf */
|
|
|
|
if (mac_size != 0)
|
|
{
|
|
s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1);
|
|
wr->length+=mac_size;
|
|
}
|
|
|
|
/* this is true regardless of mac size */
|
|
wr->input=p;
|
|
wr->data=p;
|
|
|
|
|
|
/* ssl3_enc can only have an error on read */
|
|
if (bs) /* bs != 0 in case of CBC */
|
|
{
|
|
RAND_pseudo_bytes(p,bs);
|
|
/* master IV and last CBC residue stand for
|
|
* the rest of randomness */
|
|
wr->length += bs;
|
|
}
|
|
|
|
s->method->ssl3_enc->enc(s,1);
|
|
|
|
/* record length after mac and block padding */
|
|
/* if (type == SSL3_RT_APPLICATION_DATA ||
|
|
(type == SSL3_RT_ALERT && ! SSL_in_init(s))) */
|
|
|
|
/* there's only one epoch between handshake and app data */
|
|
|
|
s2n(s->d1->w_epoch, pseq);
|
|
|
|
/* XDTLS: ?? */
|
|
/* else
|
|
s2n(s->d1->handshake_epoch, pseq); */
|
|
|
|
memcpy(pseq, &(s->s3->write_sequence[2]), 6);
|
|
pseq+=6;
|
|
s2n(wr->length,pseq);
|
|
|
|
/* we should now have
|
|
* wr->data pointing to the encrypted data, which is
|
|
* wr->length long */
|
|
wr->type=type; /* not needed but helps for debugging */
|
|
wr->length+=DTLS1_RT_HEADER_LENGTH;
|
|
|
|
#if 0 /* this is now done at the message layer */
|
|
/* buffer the record, making it easy to handle retransmits */
|
|
if ( type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC)
|
|
dtls1_buffer_record(s, wr->data, wr->length,
|
|
*((PQ_64BIT *)&(s->s3->write_sequence[0])));
|
|
#endif
|
|
|
|
ssl3_record_sequence_update(&(s->s3->write_sequence[0]));
|
|
|
|
if (create_empty_fragment)
|
|
{
|
|
/* we are in a recursive call;
|
|
* just return the length, don't write out anything here
|
|
*/
|
|
return wr->length;
|
|
}
|
|
|
|
/* now let's set up wb */
|
|
wb->left = prefix_len + wr->length;
|
|
wb->offset = 0;
|
|
|
|
/* memorize arguments so that ssl3_write_pending can detect bad write retries later */
|
|
s->s3->wpend_tot=len;
|
|
s->s3->wpend_buf=buf;
|
|
s->s3->wpend_type=type;
|
|
s->s3->wpend_ret=len;
|
|
|
|
/* we now just need to write the buffer */
|
|
return ssl3_write_pending(s,type,buf,len);
|
|
err:
|
|
return -1;
|
|
}
|
|
|
|
|
|
|
|
static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap,
|
|
PQ_64BIT *seq_num)
|
|
{
|
|
#if PQ_64BIT_IS_INTEGER
|
|
PQ_64BIT mask = 0x0000000000000001L;
|
|
#endif
|
|
PQ_64BIT rcd_num, tmp;
|
|
|
|
pq_64bit_init(&rcd_num);
|
|
pq_64bit_init(&tmp);
|
|
|
|
/* this is the sequence number for the record just read */
|
|
pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
|
|
|
|
|
|
if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
|
|
pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
|
|
{
|
|
pq_64bit_assign(seq_num, &rcd_num);
|
|
pq_64bit_free(&rcd_num);
|
|
pq_64bit_free(&tmp);
|
|
return 1; /* this record is new */
|
|
}
|
|
|
|
pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
|
|
|
|
if ( pq_64bit_get_word(&tmp) > bitmap->length)
|
|
{
|
|
pq_64bit_free(&rcd_num);
|
|
pq_64bit_free(&tmp);
|
|
return 0; /* stale, outside the window */
|
|
}
|
|
|
|
#if PQ_64BIT_IS_BIGNUM
|
|
{
|
|
int offset;
|
|
pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
|
|
pq_64bit_sub_word(&tmp, 1);
|
|
offset = pq_64bit_get_word(&tmp);
|
|
if ( pq_64bit_is_bit_set(&(bitmap->map), offset))
|
|
{
|
|
pq_64bit_free(&rcd_num);
|
|
pq_64bit_free(&tmp);
|
|
return 0;
|
|
}
|
|
}
|
|
#else
|
|
mask <<= (bitmap->max_seq_num - rcd_num - 1);
|
|
if (bitmap->map & mask)
|
|
return 0; /* record previously received */
|
|
#endif
|
|
|
|
pq_64bit_assign(seq_num, &rcd_num);
|
|
pq_64bit_free(&rcd_num);
|
|
pq_64bit_free(&tmp);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
|
|
{
|
|
unsigned int shift;
|
|
PQ_64BIT rcd_num;
|
|
PQ_64BIT tmp;
|
|
PQ_64BIT_CTX *ctx;
|
|
|
|
pq_64bit_init(&rcd_num);
|
|
pq_64bit_init(&tmp);
|
|
|
|
pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8);
|
|
|
|
/* unfortunate code complexity due to 64-bit manipulation support
|
|
* on 32-bit machines */
|
|
if ( pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) ||
|
|
pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num)))
|
|
{
|
|
pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num));
|
|
pq_64bit_add_word(&tmp, 1);
|
|
|
|
shift = (unsigned int)pq_64bit_get_word(&tmp);
|
|
|
|
pq_64bit_lshift(&(tmp), &(bitmap->map), shift);
|
|
pq_64bit_assign(&(bitmap->map), &tmp);
|
|
|
|
pq_64bit_set_bit(&(bitmap->map), 0);
|
|
pq_64bit_add_word(&rcd_num, 1);
|
|
pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num);
|
|
|
|
pq_64bit_assign_word(&tmp, 1);
|
|
pq_64bit_lshift(&tmp, &tmp, bitmap->length);
|
|
ctx = pq_64bit_ctx_new(&ctx);
|
|
pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx);
|
|
pq_64bit_ctx_free(ctx);
|
|
}
|
|
else
|
|
{
|
|
pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num);
|
|
pq_64bit_sub_word(&tmp, 1);
|
|
shift = (unsigned int)pq_64bit_get_word(&tmp);
|
|
|
|
pq_64bit_set_bit(&(bitmap->map), shift);
|
|
}
|
|
|
|
pq_64bit_free(&rcd_num);
|
|
pq_64bit_free(&tmp);
|
|
}
|
|
|
|
|
|
int dtls1_dispatch_alert(SSL *s)
|
|
{
|
|
int i,j;
|
|
void (*cb)(const SSL *ssl,int type,int val)=NULL;
|
|
unsigned char buf[2 + 2 + 3]; /* alert level + alert desc + message seq +frag_off */
|
|
unsigned char *ptr = &buf[0];
|
|
|
|
s->s3->alert_dispatch=0;
|
|
|
|
memset(buf, 0x00, sizeof(buf));
|
|
*ptr++ = s->s3->send_alert[0];
|
|
*ptr++ = s->s3->send_alert[1];
|
|
|
|
if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
|
|
{
|
|
s2n(s->d1->handshake_read_seq, ptr);
|
|
#if 0
|
|
if ( s->d1->r_msg_hdr.frag_off == 0) /* waiting for a new msg */
|
|
|
|
else
|
|
s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */
|
|
#endif
|
|
|
|
#if 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);
|
|
#endif
|
|
l2n3(s->d1->r_msg_hdr.frag_off, ptr);
|
|
}
|
|
|
|
i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0);
|
|
if (i <= 0)
|
|
{
|
|
s->s3->alert_dispatch=1;
|
|
/* fprintf( stderr, "not done with alert\n" ); */
|
|
}
|
|
else
|
|
{
|
|
if ( s->s3->send_alert[0] == SSL3_AL_FATAL ||
|
|
s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE)
|
|
(void)BIO_flush(s->wbio);
|
|
|
|
if (s->msg_callback)
|
|
s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,
|
|
2, s, s->msg_callback_arg);
|
|
|
|
if (s->info_callback != NULL)
|
|
cb=s->info_callback;
|
|
else if (s->ctx->info_callback != NULL)
|
|
cb=s->ctx->info_callback;
|
|
|
|
if (cb != NULL)
|
|
{
|
|
j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
|
|
cb(s,SSL_CB_WRITE_ALERT,j);
|
|
}
|
|
}
|
|
return(i);
|
|
}
|
|
|
|
|
|
static DTLS1_BITMAP *
|
|
dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch)
|
|
{
|
|
|
|
*is_next_epoch = 0;
|
|
|
|
/* In current epoch, accept HM, CCS, DATA, & ALERT */
|
|
if (rr->epoch == s->d1->r_epoch)
|
|
return &s->d1->bitmap;
|
|
|
|
/* Only HM and ALERT messages can be from the next epoch */
|
|
else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) &&
|
|
(rr->type == SSL3_RT_HANDSHAKE ||
|
|
rr->type == SSL3_RT_ALERT))
|
|
{
|
|
*is_next_epoch = 1;
|
|
return &s->d1->next_bitmap;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
#if 0
|
|
static int
|
|
dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority,
|
|
unsigned long *offset)
|
|
{
|
|
|
|
/* alerts are passed up immediately */
|
|
if ( rr->type == SSL3_RT_APPLICATION_DATA ||
|
|
rr->type == SSL3_RT_ALERT)
|
|
return 0;
|
|
|
|
/* Only need to buffer if a handshake is underway.
|
|
* (this implies that Hello Request and Client Hello are passed up
|
|
* immediately) */
|
|
if ( SSL_in_init(s))
|
|
{
|
|
unsigned char *data = rr->data;
|
|
/* need to extract the HM/CCS sequence number here */
|
|
if ( rr->type == SSL3_RT_HANDSHAKE ||
|
|
rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
|
|
{
|
|
unsigned short seq_num;
|
|
struct hm_header_st msg_hdr;
|
|
struct ccs_header_st ccs_hdr;
|
|
|
|
if ( rr->type == SSL3_RT_HANDSHAKE)
|
|
{
|
|
dtls1_get_message_header(data, &msg_hdr);
|
|
seq_num = msg_hdr.seq;
|
|
*offset = msg_hdr.frag_off;
|
|
}
|
|
else
|
|
{
|
|
dtls1_get_ccs_header(data, &ccs_hdr);
|
|
seq_num = ccs_hdr.seq;
|
|
*offset = 0;
|
|
}
|
|
|
|
/* this is either a record we're waiting for, or a
|
|
* retransmit of something we happened to previously
|
|
* receive (higher layers will drop the repeat silently */
|
|
if ( seq_num < s->d1->handshake_read_seq)
|
|
return 0;
|
|
if (rr->type == SSL3_RT_HANDSHAKE &&
|
|
seq_num == s->d1->handshake_read_seq &&
|
|
msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off)
|
|
return 0;
|
|
else if ( seq_num == s->d1->handshake_read_seq &&
|
|
(rr->type == SSL3_RT_CHANGE_CIPHER_SPEC ||
|
|
msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off))
|
|
return 0;
|
|
else
|
|
{
|
|
*priority = seq_num;
|
|
return 1;
|
|
}
|
|
}
|
|
else /* unknown record type */
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
void
|
|
dtls1_reset_seq_numbers(SSL *s, int rw)
|
|
{
|
|
unsigned char *seq;
|
|
unsigned int seq_bytes = sizeof(s->s3->read_sequence);
|
|
|
|
if ( rw & SSL3_CC_READ)
|
|
{
|
|
seq = s->s3->read_sequence;
|
|
s->d1->r_epoch++;
|
|
|
|
pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map));
|
|
s->d1->bitmap.length = s->d1->next_bitmap.length;
|
|
pq_64bit_assign(&(s->d1->bitmap.max_seq_num),
|
|
&(s->d1->next_bitmap.max_seq_num));
|
|
|
|
pq_64bit_free(&(s->d1->next_bitmap.map));
|
|
pq_64bit_free(&(s->d1->next_bitmap.max_seq_num));
|
|
memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
|
|
pq_64bit_init(&(s->d1->next_bitmap.map));
|
|
pq_64bit_init(&(s->d1->next_bitmap.max_seq_num));
|
|
}
|
|
else
|
|
{
|
|
seq = s->s3->write_sequence;
|
|
s->d1->w_epoch++;
|
|
}
|
|
|
|
memset(seq, 0x00, seq_bytes);
|
|
}
|
|
|
|
#if PQ_64BIT_IS_INTEGER
|
|
static PQ_64BIT
|
|
bytes_to_long_long(unsigned char *bytes, PQ_64BIT *num)
|
|
{
|
|
PQ_64BIT _num;
|
|
|
|
_num = (((PQ_64BIT)bytes[0]) << 56) |
|
|
(((PQ_64BIT)bytes[1]) << 48) |
|
|
(((PQ_64BIT)bytes[2]) << 40) |
|
|
(((PQ_64BIT)bytes[3]) << 32) |
|
|
(((PQ_64BIT)bytes[4]) << 24) |
|
|
(((PQ_64BIT)bytes[5]) << 16) |
|
|
(((PQ_64BIT)bytes[6]) << 8) |
|
|
(((PQ_64BIT)bytes[7]) );
|
|
|
|
*num = _num ;
|
|
return _num;
|
|
}
|
|
#endif
|
|
|
|
|
|
static void
|
|
dtls1_clear_timeouts(SSL *s)
|
|
{
|
|
memset(&(s->d1->timeout), 0x00, sizeof(struct dtls1_timeout_st));
|
|
}
|