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openssl/ssl/d1_pkt.c
Ben Laurie f5cd3561ba Add and use a constant-time memcmp. 
This change adds CRYPTO_memcmp, which compares two vectors of bytes in
an amount of time that's independent of their contents. It also changes
several MAC compares in the code to use this over the standard memcmp,
which may leak information about the size of a matching prefix.
(cherry picked from commit 2ee798880a)
2013-02-06 13:56:12 +00:00

1876 lines
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/* ssl/d1_pkt.c */
/*
* DTLS implementation written by Nagendra Modadugu
* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
*/
/* ====================================================================
* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include <errno.h>
#define USE_SOCKETS
#include "ssl_locl.h"
#include <openssl/evp.h>
#include <openssl/buffer.h>
#include <openssl/pqueue.h>
#include <openssl/rand.h>
/* mod 128 saturating subtract of two 64-bit values in big-endian order */
static int satsub64be(const unsigned char *v1,const unsigned char *v2)
{ int ret,sat,brw,i;
if (sizeof(long) == 8) do
{ const union { long one; char little; } is_endian = {1};
long l;
if (is_endian.little) break;
/* not reached on little-endians */
/* following test is redundant, because input is
* always aligned, but I take no chances... */
if (((size_t)v1|(size_t)v2)&0x7) break;
l = *((long *)v1);
l -= *((long *)v2);
if (l>128) return 128;
else if (l<-128) return -128;
else return (int)l;
} while (0);
ret = (int)v1[7]-(int)v2[7];
sat = 0;
brw = ret>>8; /* brw is either 0 or -1 */
if (ret & 0x80)
{ for (i=6;i>=0;i--)
{ brw += (int)v1[i]-(int)v2[i];
sat |= ~brw;
brw >>= 8;
}
}
else
{ for (i=6;i>=0;i--)
{ brw += (int)v1[i]-(int)v2[i];
sat |= brw;
brw >>= 8;
}
}
brw <<= 8; /* brw is either 0 or -256 */
if (sat&0xff) return brw | 0x80;
else return brw + (ret&0xFF);
}
static int have_handshake_fragment(SSL *s, int type, unsigned char *buf,
int len, int peek);
static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap);
static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap);
static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr,
unsigned int *is_next_epoch);
#if 0
static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr,
unsigned short *priority, unsigned long *offset);
#endif
static int dtls1_buffer_record(SSL *s, record_pqueue *q,
unsigned char *priority);
static int dtls1_process_record(SSL *s);
/* copy buffered record into SSL structure */
static int
dtls1_copy_record(SSL *s, pitem *item)
{
DTLS1_RECORD_DATA *rdata;
rdata = (DTLS1_RECORD_DATA *)item->data;
if (s->s3->rbuf.buf != NULL)
OPENSSL_free(s->s3->rbuf.buf);
s->packet = rdata->packet;
s->packet_length = rdata->packet_length;
memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
/* Set proper sequence number for mac calculation */
memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6);
return(1);
}
static int
dtls1_buffer_record(SSL *s, record_pqueue *queue, unsigned char *priority)
{
DTLS1_RECORD_DATA *rdata;
pitem *item;
/* Limit the size of the queue to prevent DOS attacks */
if (pqueue_size(queue->q) >= 100)
return 0;
rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA));
item = pitem_new(priority, rdata);
if (rdata == NULL || item == NULL)
{
if (rdata != NULL) OPENSSL_free(rdata);
if (item != NULL) pitem_free(item);
SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
return(0);
}
rdata->packet = s->packet;
rdata->packet_length = s->packet_length;
memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER));
memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD));
item->data = rdata;
#ifndef OPENSSL_NO_SCTP
/* Store bio_dgram_sctp_rcvinfo struct */
if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
(s->state == SSL3_ST_SR_FINISHED_A || s->state == SSL3_ST_CR_FINISHED_A)) {
BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_GET_RCVINFO, sizeof(rdata->recordinfo), &rdata->recordinfo);
}
#endif
/* insert should not fail, since duplicates are dropped */
if (pqueue_insert(queue->q, item) == NULL)
{
OPENSSL_free(rdata);
pitem_free(item);
return(0);
}
s->packet = NULL;
s->packet_length = 0;
memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER));
memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD));
if (!ssl3_setup_buffers(s))
{
SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR);
OPENSSL_free(rdata);
pitem_free(item);
return(0);
}
return(1);
}
static int
dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue)
{
pitem *item;
item = pqueue_pop(queue->q);
if (item)
{
dtls1_copy_record(s, item);
OPENSSL_free(item->data);
pitem_free(item);
return(1);
}
return(0);
}
/* retrieve a buffered record that belongs to the new epoch, i.e., not processed
* yet */
#define dtls1_get_unprocessed_record(s) \
dtls1_retrieve_buffered_record((s), \
&((s)->d1->unprocessed_rcds))
/* retrieve a buffered record that belongs to the current epoch, ie, processed */
#define dtls1_get_processed_record(s) \
dtls1_retrieve_buffered_record((s), \
&((s)->d1->processed_rcds))
static int
dtls1_process_buffered_records(SSL *s)
{
pitem *item;
item = pqueue_peek(s->d1->unprocessed_rcds.q);
if (item)
{
/* Check if epoch is current. */
if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch)
return(1); /* Nothing to do. */
/* Process all the records. */
while (pqueue_peek(s->d1->unprocessed_rcds.q))
{
dtls1_get_unprocessed_record(s);
if ( ! dtls1_process_record(s))
return(0);
dtls1_buffer_record(s, &(s->d1->processed_rcds),
s->s3->rrec.seq_num);
}
}
/* sync epoch numbers once all the unprocessed records
* have been processed */
s->d1->processed_rcds.epoch = s->d1->r_epoch;
s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1;
return(1);
}
#if 0
static int
dtls1_get_buffered_record(SSL *s)
{
pitem *item;
PQ_64BIT priority =
(((PQ_64BIT)s->d1->handshake_read_seq) << 32) |
((PQ_64BIT)s->d1->r_msg_hdr.frag_off);
if ( ! SSL_in_init(s)) /* if we're not (re)negotiating,
nothing buffered */
return 0;
item = pqueue_peek(s->d1->rcvd_records);
if (item && item->priority == priority)
{
/* Check if we've received the record of interest. It must be
* a handshake record, since data records as passed up without
* buffering */
DTLS1_RECORD_DATA *rdata;
item = pqueue_pop(s->d1->rcvd_records);
rdata = (DTLS1_RECORD_DATA *)item->data;
if (s->s3->rbuf.buf != NULL)
OPENSSL_free(s->s3->rbuf.buf);
s->packet = rdata->packet;
s->packet_length = rdata->packet_length;
memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER));
memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD));
OPENSSL_free(item->data);
pitem_free(item);
/* s->d1->next_expected_seq_num++; */
return(1);
}
return 0;
}
#endif
static int
dtls1_process_record(SSL *s)
{
int i,al;
int clear=0;
int enc_err;
SSL_SESSION *sess;
SSL3_RECORD *rr;
unsigned int mac_size;
unsigned char md[EVP_MAX_MD_SIZE];
int decryption_failed_or_bad_record_mac = 0;
unsigned char *mac = NULL;
rr= &(s->s3->rrec);
sess = s->session;
/* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
* and we have that many bytes in s->packet
*/
rr->input= &(s->packet[DTLS1_RT_HEADER_LENGTH]);
/* ok, we can now read from 's->packet' data into 'rr'
* rr->input points at rr->length bytes, which
* need to be copied into rr->data by either
* the decryption or by the decompression
* When the data is 'copied' into the rr->data buffer,
* rr->input will be pointed at the new buffer */
/* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
* rr->length bytes of encrypted compressed stuff. */
/* check is not needed I believe */
if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
{
al=SSL_AD_RECORD_OVERFLOW;
SSLerr(SSL_F_DTLS1_PROCESS_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
goto f_err;
}
/* decrypt in place in 'rr->input' */
rr->data=rr->input;
enc_err = s->method->ssl3_enc->enc(s,0);
if (enc_err <= 0)
{
/* To minimize information leaked via timing, we will always
* perform all computations before discarding the message.
*/
decryption_failed_or_bad_record_mac = 1;
}
#ifdef TLS_DEBUG
printf("dec %d\n",rr->length);
{ unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
printf("\n");
#endif
/* r->length is now the compressed data plus mac */
if ( (sess == NULL) ||
(s->enc_read_ctx == NULL) ||
(s->read_hash == NULL))
clear=1;
if (!clear)
{
/* !clear => s->read_hash != NULL => mac_size != -1 */
int t;
t=EVP_MD_CTX_size(s->read_hash);
OPENSSL_assert(t >= 0);
mac_size=t;
if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+mac_size)
{
#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
decryption_failed_or_bad_record_mac = 1;
#endif
}
/* check the MAC for rr->input (it's in mac_size bytes at the tail) */
if (rr->length >= mac_size)
{
rr->length -= mac_size;
mac = &rr->data[rr->length];
}
else
rr->length = 0;
i=s->method->ssl3_enc->mac(s,md,0);
if (i < 0 || mac == NULL || CRYPTO_memcmp(md,mac,mac_size) != 0)
{
decryption_failed_or_bad_record_mac = 1;
}
}
if (decryption_failed_or_bad_record_mac)
{
/* decryption failed, silently discard message */
rr->length = 0;
s->packet_length = 0;
goto err;
}
/* 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;
dtls1_record_bitmap_update(s, &(s->d1->bitmap));/* Mark receipt of record. */
return(1);
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;
int i,n;
SSL3_RECORD *rr;
unsigned char *p = NULL;
unsigned short version;
DTLS1_BITMAP *bitmap;
unsigned int is_next_epoch;
rr= &(s->s3->rrec);
/* The epoch may have changed. If so, process all the
* pending records. This is a non-blocking operation. */
dtls1_process_buffered_records(s);
/* 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 */
/* this packet contained a partial record, dump it */
if (s->packet_length != DTLS1_RT_HEADER_LENGTH)
{
s->packet_length = 0;
goto again;
}
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)
{
/* unexpected version, silently discard */
rr->length = 0;
s->packet_length = 0;
goto again;
}
}
if ((version & 0xff00) != (s->version & 0xff00))
{
/* wrong version, silently discard record */
rr->length = 0;
s->packet_length = 0;
goto again;
}
if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH)
{
/* record too long, silently discard it */
rr->length = 0;
s->packet_length = 0;
goto again;
}
/* 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)
{
rr->length = 0;
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)
{
rr->length = 0;
s->packet_length = 0; /* dump this record */
goto again; /* get another record */
}
#ifndef OPENSSL_NO_SCTP
/* Only do replay check if no SCTP bio */
if (!BIO_dgram_is_sctp(SSL_get_rbio(s)))
{
#endif
/* Check whether this is a repeat, or aged record.
* Don't check if we're listening and this message is
* a ClientHello. They can look as if they're replayed,
* since they arrive from different connections and
* would be dropped unnecessarily.
*/
if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE &&
*p == SSL3_MT_CLIENT_HELLO) &&
!dtls1_record_replay_check(s, bitmap))
{
rr->length = 0;
s->packet_length=0; /* dump this record */
goto again; /* get another record */
}
#ifndef OPENSSL_NO_SCTP
}
#endif
/* just read a 0 length packet */
if (rr->length == 0) goto again;
/* If this record is from the next epoch (either HM or ALERT),
* and a handshake is currently in progress, buffer it since it
* cannot be processed at this time. However, do not buffer
* anything while listening.
*/
if (is_next_epoch)
{
if ((SSL_in_init(s) || s->in_handshake) && !s->d1->listen)
{
dtls1_buffer_record(s, &(s->d1->unprocessed_rcds), rr->seq_num);
}
rr->length = 0;
s->packet_length = 0;
goto again;
}
if (!dtls1_process_record(s))
{
rr->length = 0;
s->packet_length = 0; /* dump this record */
goto again; /* get another record */
}
return(1);
}
/* 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. */
#ifndef OPENSSL_NO_SCTP
/* Continue handshake if it had to be interrupted to read
* app data with SCTP.
*/
if ((!s->in_handshake && SSL_in_init(s)) ||
(BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
(s->state == DTLS1_SCTP_ST_SR_READ_SOCK || s->state == DTLS1_SCTP_ST_CR_READ_SOCK) &&
s->s3->in_read_app_data != 2))
#else
if (!s->in_handshake && SSL_in_init(s))
#endif
{
/* 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);
/* We are not handshaking and have no data yet,
* so process data buffered during the last handshake
* in advance, if any.
*/
if (s->state == SSL_ST_OK && rr->length == 0)
{
pitem *item;
item = pqueue_pop(s->d1->buffered_app_data.q);
if (item)
{
#ifndef OPENSSL_NO_SCTP
/* Restore bio_dgram_sctp_rcvinfo struct */
if (BIO_dgram_is_sctp(SSL_get_rbio(s)))
{
DTLS1_RECORD_DATA *rdata = (DTLS1_RECORD_DATA *) item->data;
BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SCTP_SET_RCVINFO, sizeof(rdata->recordinfo), &rdata->recordinfo);
}
#endif
dtls1_copy_record(s, item);
OPENSSL_free(item->data);
pitem_free(item);
}
}
/* Check for timeout */
if (dtls1_handle_timeout(s) > 0)
goto start;
/* 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))
{
/* We now have application data between CCS and Finished.
* Most likely the packets were reordered on their way, so
* buffer the application data for later processing rather
* than dropping the connection.
*/
dtls1_buffer_record(s, &(s->d1->buffered_app_data), rr->seq_num);
rr->length = 0;
goto start;
}
/* 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;
}
}
#ifndef OPENSSL_NO_SCTP
/* We were about to renegotiate but had to read
* belated application data first, so retry.
*/
if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
rr->type == SSL3_RT_APPLICATION_DATA &&
(s->state == DTLS1_SCTP_ST_SR_READ_SOCK || s->state == DTLS1_SCTP_ST_CR_READ_SOCK))
{
s->rwstate=SSL_READING;
BIO_clear_retry_flags(SSL_get_rbio(s));
BIO_set_retry_read(SSL_get_rbio(s));
}
/* We might had to delay a close_notify alert because
* of reordered app data. If there was an alert and there
* is no message to read anymore, finally set shutdown.
*/
if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
s->d1->shutdown_received && !BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
{
s->shutdown |= SSL_RECEIVED_SHUTDOWN;
return(0);
}
#endif
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;
}
#ifndef OPENSSL_NO_HEARTBEATS
else if (rr->type == TLS1_RT_HEARTBEAT)
{
dtls1_process_heartbeat(s);
/* Exit and notify application to read again */
rr->length = 0;
s->rwstate=SSL_READING;
BIO_clear_retry_flags(SSL_get_rbio(s));
BIO_set_retry_read(SSL_get_rbio(s));
return(-1);
}
#endif
/* else it's a CCS message, or application data or wrong */
else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC)
{
/* Application data while renegotiating
* is allowed. Try again reading.
*/
if (rr->type == SSL3_RT_APPLICATION_DATA)
{
BIO *bio;
s->s3->in_read_app_data=2;
bio=SSL_get_rbio(s);
s->rwstate=SSL_READING;
BIO_clear_retry_flags(bio);
BIO_set_retry_read(bio);
return(-1);
}
/* 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)
{
#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
/*
* for normal alerts rr->length is 2, while
* dest_maxlen is 7 if we were to handle this
* non-existing alert...
*/
FIX ME
#endif
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)
{
s->new_session = 1;
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)
{
#ifndef OPENSSL_NO_SCTP
/* With SCTP and streams the socket may deliver app data
* after a close_notify alert. We have to check this
* first so that nothing gets discarded.
*/
if (BIO_dgram_is_sctp(SSL_get_rbio(s)) &&
BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
{
s->d1->shutdown_received = 1;
s->rwstate=SSL_READING;
BIO_clear_retry_flags(SSL_get_rbio(s));
BIO_set_retry_read(SSL_get_rbio(s));
return -1;
}
#endif
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,
dtls1_get_queue_priority(frag->msg_header.seq, 0),
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;
unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH;
dtls1_get_ccs_header(rr->data, &ccs_hdr);
if (s->version == DTLS1_BAD_VER)
ccs_hdr_len = 3;
/* '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 ( (rr->length != ccs_hdr_len) ||
(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);
/* We can't process a CCS now, because previous handshake
* messages are still missing, so just drop it.
*/
if (!s->d1->change_cipher_spec_ok)
{
goto start;
}
s->d1->change_cipher_spec_ok = 0;
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->version == DTLS1_BAD_VER)
s->d1->handshake_read_seq++;
#ifndef OPENSSL_NO_SCTP
/* Remember that a CCS has been received,
* so that an old key of SCTP-Auth can be
* deleted when a CCS is sent. Will be ignored
* if no SCTP is used
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL);
#endif
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 we are server, we may have a repeated FINISHED of the
* client here, then retransmit our CCS and FINISHED.
*/
if (msg_hdr.type == SSL3_MT_FINISHED)
{
if (dtls1_check_timeout_num(s) < 0)
return -1;
dtls1_retransmit_buffered_messages(s);
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->renegotiate=1;
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)
{
int i;
#ifndef OPENSSL_NO_SCTP
/* Check if we have to continue an interrupted handshake
* for reading belated app data with SCTP.
*/
if ((SSL_in_init(s) && !s->in_handshake) ||
(BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
(s->state == DTLS1_SCTP_ST_SR_READ_SOCK || s->state == DTLS1_SCTP_ST_CR_READ_SOCK)))
#else
if (SSL_in_init(s) && !s->in_handshake)
#endif
{
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;
}
}
if (len > SSL3_RT_MAX_PLAIN_LENGTH)
{
SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES,SSL_R_DTLS_MESSAGE_TOO_BIG);
return -1;
}
i = dtls1_write_bytes(s, type, buf_, len);
return i;
}
/* 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)
{
int i;
OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH);
s->rwstate=SSL_NOTHING;
i=do_dtls1_write(s, type, buf, len, 0);
return 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) ||
(EVP_MD_CTX_md(s->write_hash) == NULL))
clear=1;
if (clear)
mac_size=0;
else
{
mac_size=EVP_MD_CTX_size(s->write_hash);
if (mac_size < 0)
goto err;
}
/* 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 && SSL_version(s) != DTLS1_BAD_VER)
{
/* 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;
*(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)
{
if(s->method->ssl3_enc->mac(s,&(p[wr->length + bs]),1) < 0)
goto err;
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)
{
int cmp;
unsigned int shift;
const unsigned char *seq = s->s3->read_sequence;
cmp = satsub64be(seq,bitmap->max_seq_num);
if (cmp > 0)
{
memcpy (s->s3->rrec.seq_num,seq,8);
return 1; /* this record in new */
}
shift = -cmp;
if (shift >= sizeof(bitmap->map)*8)
return 0; /* stale, outside the window */
else if (bitmap->map & (1UL<<shift))
return 0; /* record previously received */
memcpy (s->s3->rrec.seq_num,seq,8);
return 1;
}
static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap)
{
int cmp;
unsigned int shift;
const unsigned char *seq = s->s3->read_sequence;
cmp = satsub64be(seq,bitmap->max_seq_num);
if (cmp > 0)
{
shift = cmp;
if (shift < sizeof(bitmap->map)*8)
bitmap->map <<= shift, bitmap->map |= 1UL;
else
bitmap->map = 1UL;
memcpy(bitmap->max_seq_num,seq,8);
}
else {
shift = -cmp;
if (shift < sizeof(bitmap->map)*8)
bitmap->map |= 1UL<<shift;
}
}
int dtls1_dispatch_alert(SSL *s)
{
int i,j;
void (*cb)(const SSL *ssl,int type,int val)=NULL;
unsigned char buf[DTLS1_AL_HEADER_LENGTH];
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];
#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
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);
}
#endif
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
#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
|| s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
#endif
)
(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++;
memcpy(&(s->d1->bitmap), &(s->d1->next_bitmap), sizeof(DTLS1_BITMAP));
memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP));
}
else
{
seq = s->s3->write_sequence;
memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence));
s->d1->w_epoch++;
}
memset(seq, 0x00, seq_bytes);
}
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