kopia lustrzana https://github.com/ryukoposting/Signal-Android
744 wiersze
20 KiB
C
744 wiersze
20 KiB
C
/* ssl/s2_pkt.c */
|
|
/* 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.]
|
|
*/
|
|
/* ====================================================================
|
|
* Copyright (c) 1998-2001 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).
|
|
*
|
|
*/
|
|
|
|
#include "ssl_locl.h"
|
|
#ifndef OPENSSL_NO_SSL2
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#define USE_SOCKETS
|
|
|
|
static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);
|
|
static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len);
|
|
static int write_pending(SSL *s, const unsigned char *buf, unsigned int len);
|
|
static int ssl_mt_error(int n);
|
|
|
|
|
|
/* SSL 2.0 imlementation for SSL_read/SSL_peek -
|
|
* This routine will return 0 to len bytes, decrypted etc if required.
|
|
*/
|
|
static int ssl2_read_internal(SSL *s, void *buf, int len, int peek)
|
|
{
|
|
int n;
|
|
unsigned char mac[MAX_MAC_SIZE];
|
|
unsigned char *p;
|
|
int i;
|
|
int mac_size;
|
|
|
|
ssl2_read_again:
|
|
if (SSL_in_init(s) && !s->in_handshake)
|
|
{
|
|
n=s->handshake_func(s);
|
|
if (n < 0) return(n);
|
|
if (n == 0)
|
|
{
|
|
SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
return(-1);
|
|
}
|
|
}
|
|
|
|
clear_sys_error();
|
|
s->rwstate=SSL_NOTHING;
|
|
if (len <= 0) return(len);
|
|
|
|
if (s->s2->ract_data_length != 0) /* read from buffer */
|
|
{
|
|
if (len > s->s2->ract_data_length)
|
|
n=s->s2->ract_data_length;
|
|
else
|
|
n=len;
|
|
|
|
memcpy(buf,s->s2->ract_data,(unsigned int)n);
|
|
if (!peek)
|
|
{
|
|
s->s2->ract_data_length-=n;
|
|
s->s2->ract_data+=n;
|
|
if (s->s2->ract_data_length == 0)
|
|
s->rstate=SSL_ST_READ_HEADER;
|
|
}
|
|
|
|
return(n);
|
|
}
|
|
|
|
/* s->s2->ract_data_length == 0
|
|
*
|
|
* Fill the buffer, then goto ssl2_read_again.
|
|
*/
|
|
|
|
if (s->rstate == SSL_ST_READ_HEADER)
|
|
{
|
|
if (s->first_packet)
|
|
{
|
|
n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
|
|
if (n <= 0) return(n); /* error or non-blocking */
|
|
s->first_packet=0;
|
|
p=s->packet;
|
|
if (!((p[0] & 0x80) && (
|
|
(p[2] == SSL2_MT_CLIENT_HELLO) ||
|
|
(p[2] == SSL2_MT_SERVER_HELLO))))
|
|
{
|
|
SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_NON_SSLV2_INITIAL_PACKET);
|
|
return(-1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
|
|
if (n <= 0) return(n); /* error or non-blocking */
|
|
}
|
|
/* part read stuff */
|
|
|
|
s->rstate=SSL_ST_READ_BODY;
|
|
p=s->packet;
|
|
/* Do header */
|
|
/*s->s2->padding=0;*/
|
|
s->s2->escape=0;
|
|
s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]);
|
|
if ((p[0] & TWO_BYTE_BIT)) /* Two byte header? */
|
|
{
|
|
s->s2->three_byte_header=0;
|
|
s->s2->rlength&=TWO_BYTE_MASK;
|
|
}
|
|
else
|
|
{
|
|
s->s2->three_byte_header=1;
|
|
s->s2->rlength&=THREE_BYTE_MASK;
|
|
|
|
/* security >s2->escape */
|
|
s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0;
|
|
}
|
|
}
|
|
|
|
if (s->rstate == SSL_ST_READ_BODY)
|
|
{
|
|
n=s->s2->rlength+2+s->s2->three_byte_header;
|
|
if (n > (int)s->packet_length)
|
|
{
|
|
n-=s->packet_length;
|
|
i=read_n(s,(unsigned int)n,(unsigned int)n,1);
|
|
if (i <= 0) return(i); /* ERROR */
|
|
}
|
|
|
|
p= &(s->packet[2]);
|
|
s->rstate=SSL_ST_READ_HEADER;
|
|
if (s->s2->three_byte_header)
|
|
s->s2->padding= *(p++);
|
|
else s->s2->padding=0;
|
|
|
|
/* Data portion */
|
|
if (s->s2->clear_text)
|
|
{
|
|
mac_size = 0;
|
|
s->s2->mac_data=p;
|
|
s->s2->ract_data=p;
|
|
if (s->s2->padding)
|
|
{
|
|
SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING);
|
|
return(-1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
mac_size=EVP_MD_CTX_size(s->read_hash);
|
|
if (mac_size < 0)
|
|
return -1;
|
|
OPENSSL_assert(mac_size <= MAX_MAC_SIZE);
|
|
s->s2->mac_data=p;
|
|
s->s2->ract_data= &p[mac_size];
|
|
if (s->s2->padding + mac_size > s->s2->rlength)
|
|
{
|
|
SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING);
|
|
return(-1);
|
|
}
|
|
}
|
|
|
|
s->s2->ract_data_length=s->s2->rlength;
|
|
/* added a check for length > max_size in case
|
|
* encryption was not turned on yet due to an error */
|
|
if ((!s->s2->clear_text) &&
|
|
(s->s2->rlength >= (unsigned int)mac_size))
|
|
{
|
|
ssl2_enc(s,0);
|
|
s->s2->ract_data_length-=mac_size;
|
|
ssl2_mac(s,mac,0);
|
|
s->s2->ract_data_length-=s->s2->padding;
|
|
if ( (CRYPTO_memcmp(mac,s->s2->mac_data,mac_size) != 0) ||
|
|
(s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
|
|
{
|
|
SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE);
|
|
return(-1);
|
|
}
|
|
}
|
|
INC32(s->s2->read_sequence); /* expect next number */
|
|
/* s->s2->ract_data is now available for processing */
|
|
|
|
/* Possibly the packet that we just read had 0 actual data bytes.
|
|
* (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.)
|
|
* In this case, returning 0 would be interpreted by the caller
|
|
* as indicating EOF, so it's not a good idea. Instead, we just
|
|
* continue reading; thus ssl2_read_internal may have to process
|
|
* multiple packets before it can return.
|
|
*
|
|
* [Note that using select() for blocking sockets *never* guarantees
|
|
* that the next SSL_read will not block -- the available
|
|
* data may contain incomplete packets, and except for SSL 2,
|
|
* renegotiation can confuse things even more.] */
|
|
|
|
goto ssl2_read_again; /* This should really be
|
|
* "return ssl2_read(s,buf,len)",
|
|
* but that would allow for
|
|
* denial-of-service attacks if a
|
|
* C compiler is used that does not
|
|
* recognize end-recursion. */
|
|
}
|
|
else
|
|
{
|
|
SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE);
|
|
return(-1);
|
|
}
|
|
}
|
|
|
|
int ssl2_read(SSL *s, void *buf, int len)
|
|
{
|
|
return ssl2_read_internal(s, buf, len, 0);
|
|
}
|
|
|
|
int ssl2_peek(SSL *s, void *buf, int len)
|
|
{
|
|
return ssl2_read_internal(s, buf, len, 1);
|
|
}
|
|
|
|
static int read_n(SSL *s, unsigned int n, unsigned int max,
|
|
unsigned int extend)
|
|
{
|
|
int i,off,newb;
|
|
|
|
/* if there is stuff still in the buffer from a previous read,
|
|
* and there is more than we want, take some. */
|
|
if (s->s2->rbuf_left >= (int)n)
|
|
{
|
|
if (extend)
|
|
s->packet_length+=n;
|
|
else
|
|
{
|
|
s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
|
|
s->packet_length=n;
|
|
}
|
|
s->s2->rbuf_left-=n;
|
|
s->s2->rbuf_offs+=n;
|
|
return(n);
|
|
}
|
|
|
|
if (!s->read_ahead) max=n;
|
|
if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
|
|
max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
|
|
|
|
|
|
/* Else we want more than we have.
|
|
* First, if there is some left or we want to extend */
|
|
off=0;
|
|
if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
|
|
{
|
|
newb=s->s2->rbuf_left;
|
|
if (extend)
|
|
{
|
|
off=s->packet_length;
|
|
if (s->packet != s->s2->rbuf)
|
|
memcpy(s->s2->rbuf,s->packet,
|
|
(unsigned int)newb+off);
|
|
}
|
|
else if (s->s2->rbuf_offs != 0)
|
|
{
|
|
memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
|
|
(unsigned int)newb);
|
|
s->s2->rbuf_offs=0;
|
|
}
|
|
s->s2->rbuf_left=0;
|
|
}
|
|
else
|
|
newb=0;
|
|
|
|
/* off is the offset to start writing too.
|
|
* r->s2->rbuf_offs is the 'unread data', now 0.
|
|
* newb is the number of new bytes so far
|
|
*/
|
|
s->packet=s->s2->rbuf;
|
|
while (newb < (int)n)
|
|
{
|
|
clear_sys_error();
|
|
if (s->rbio != NULL)
|
|
{
|
|
s->rwstate=SSL_READING;
|
|
i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
|
|
max-newb);
|
|
}
|
|
else
|
|
{
|
|
SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
|
|
i= -1;
|
|
}
|
|
#ifdef PKT_DEBUG
|
|
if (s->debug & 0x01) sleep(1);
|
|
#endif
|
|
if (i <= 0)
|
|
{
|
|
s->s2->rbuf_left+=newb;
|
|
return(i);
|
|
}
|
|
newb+=i;
|
|
}
|
|
|
|
/* record unread data */
|
|
if (newb > (int)n)
|
|
{
|
|
s->s2->rbuf_offs=n+off;
|
|
s->s2->rbuf_left=newb-n;
|
|
}
|
|
else
|
|
{
|
|
s->s2->rbuf_offs=0;
|
|
s->s2->rbuf_left=0;
|
|
}
|
|
if (extend)
|
|
s->packet_length+=n;
|
|
else
|
|
s->packet_length=n;
|
|
s->rwstate=SSL_NOTHING;
|
|
return(n);
|
|
}
|
|
|
|
int ssl2_write(SSL *s, const void *_buf, int len)
|
|
{
|
|
const unsigned char *buf=_buf;
|
|
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_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
return(-1);
|
|
}
|
|
}
|
|
|
|
if (s->error)
|
|
{
|
|
ssl2_write_error(s);
|
|
if (s->error)
|
|
return(-1);
|
|
}
|
|
|
|
clear_sys_error();
|
|
s->rwstate=SSL_NOTHING;
|
|
if (len <= 0) return(len);
|
|
|
|
tot=s->s2->wnum;
|
|
s->s2->wnum=0;
|
|
|
|
n=(len-tot);
|
|
for (;;)
|
|
{
|
|
i=n_do_ssl_write(s,&(buf[tot]),n);
|
|
if (i <= 0)
|
|
{
|
|
s->s2->wnum=tot;
|
|
return(i);
|
|
}
|
|
if ((i == (int)n) ||
|
|
(s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))
|
|
{
|
|
return(tot+i);
|
|
}
|
|
|
|
n-=i;
|
|
tot+=i;
|
|
}
|
|
}
|
|
|
|
static int write_pending(SSL *s, const unsigned char *buf, unsigned int len)
|
|
{
|
|
int i;
|
|
|
|
/* s->s2->wpend_len != 0 MUST be true. */
|
|
|
|
/* check that they have given us the same buffer to
|
|
* write */
|
|
if ((s->s2->wpend_tot > (int)len) ||
|
|
((s->s2->wpend_buf != buf) &&
|
|
!(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)))
|
|
{
|
|
SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
|
|
return(-1);
|
|
}
|
|
|
|
for (;;)
|
|
{
|
|
clear_sys_error();
|
|
if (s->wbio != NULL)
|
|
{
|
|
s->rwstate=SSL_WRITING;
|
|
i=BIO_write(s->wbio,
|
|
(char *)&(s->s2->write_ptr[s->s2->wpend_off]),
|
|
(unsigned int)s->s2->wpend_len);
|
|
}
|
|
else
|
|
{
|
|
SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
|
|
i= -1;
|
|
}
|
|
#ifdef PKT_DEBUG
|
|
if (s->debug & 0x01) sleep(1);
|
|
#endif
|
|
if (i == s->s2->wpend_len)
|
|
{
|
|
s->s2->wpend_len=0;
|
|
s->rwstate=SSL_NOTHING;
|
|
return(s->s2->wpend_ret);
|
|
}
|
|
else if (i <= 0)
|
|
return(i);
|
|
s->s2->wpend_off+=i;
|
|
s->s2->wpend_len-=i;
|
|
}
|
|
}
|
|
|
|
static int n_do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len)
|
|
{
|
|
unsigned int j,k,olen,p,bs;
|
|
int mac_size;
|
|
register unsigned char *pp;
|
|
|
|
olen=len;
|
|
|
|
/* first check if there is data from an encryption waiting to
|
|
* be sent - it must be sent because the other end is waiting.
|
|
* This will happen with non-blocking IO. We print it and then
|
|
* return.
|
|
*/
|
|
if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
|
|
|
|
/* set mac_size to mac size */
|
|
if (s->s2->clear_text)
|
|
mac_size=0;
|
|
else
|
|
{
|
|
mac_size=EVP_MD_CTX_size(s->write_hash);
|
|
if (mac_size < 0)
|
|
return -1;
|
|
}
|
|
|
|
/* lets set the pad p */
|
|
if (s->s2->clear_text)
|
|
{
|
|
if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
|
|
len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
|
|
p=0;
|
|
s->s2->three_byte_header=0;
|
|
/* len=len; */
|
|
}
|
|
else
|
|
{
|
|
bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
|
|
j=len+mac_size;
|
|
/* Two-byte headers allow for a larger record length than
|
|
* three-byte headers, but we can't use them if we need
|
|
* padding or if we have to set the escape bit. */
|
|
if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
|
|
(!s->s2->escape))
|
|
{
|
|
if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
|
|
j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
|
|
/* set k to the max number of bytes with 2
|
|
* byte header */
|
|
k=j-(j%bs);
|
|
/* how many data bytes? */
|
|
len=k-mac_size;
|
|
s->s2->three_byte_header=0;
|
|
p=0;
|
|
}
|
|
else if ((bs <= 1) && (!s->s2->escape))
|
|
{
|
|
/* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus
|
|
* j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */
|
|
s->s2->three_byte_header=0;
|
|
p=0;
|
|
}
|
|
else /* we may have to use a 3 byte header */
|
|
{
|
|
/* If s->s2->escape is not set, then
|
|
* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus
|
|
* j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */
|
|
p=(j%bs);
|
|
p=(p == 0)?0:(bs-p);
|
|
if (s->s2->escape)
|
|
{
|
|
s->s2->three_byte_header=1;
|
|
if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
|
|
j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER;
|
|
}
|
|
else
|
|
s->s2->three_byte_header=(p == 0)?0:1;
|
|
}
|
|
}
|
|
|
|
/* Now
|
|
* j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER
|
|
* holds, and if s->s2->three_byte_header is set, then even
|
|
* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER.
|
|
*/
|
|
|
|
/* mac_size is the number of MAC bytes
|
|
* len is the number of data bytes we are going to send
|
|
* p is the number of padding bytes
|
|
* (if it is a two-byte header, then p == 0) */
|
|
|
|
s->s2->wlength=len;
|
|
s->s2->padding=p;
|
|
s->s2->mac_data= &(s->s2->wbuf[3]);
|
|
s->s2->wact_data= &(s->s2->wbuf[3+mac_size]);
|
|
/* we copy the data into s->s2->wbuf */
|
|
memcpy(s->s2->wact_data,buf,len);
|
|
if (p)
|
|
memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */
|
|
|
|
if (!s->s2->clear_text)
|
|
{
|
|
s->s2->wact_data_length=len+p;
|
|
ssl2_mac(s,s->s2->mac_data,1);
|
|
s->s2->wlength+=p+mac_size;
|
|
ssl2_enc(s,1);
|
|
}
|
|
|
|
/* package up the header */
|
|
s->s2->wpend_len=s->s2->wlength;
|
|
if (s->s2->three_byte_header) /* 3 byte header */
|
|
{
|
|
pp=s->s2->mac_data;
|
|
pp-=3;
|
|
pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8);
|
|
if (s->s2->escape) pp[0]|=SEC_ESC_BIT;
|
|
pp[1]=s->s2->wlength&0xff;
|
|
pp[2]=s->s2->padding;
|
|
s->s2->wpend_len+=3;
|
|
}
|
|
else
|
|
{
|
|
pp=s->s2->mac_data;
|
|
pp-=2;
|
|
pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT;
|
|
pp[1]=s->s2->wlength&0xff;
|
|
s->s2->wpend_len+=2;
|
|
}
|
|
s->s2->write_ptr=pp;
|
|
|
|
INC32(s->s2->write_sequence); /* expect next number */
|
|
|
|
/* lets try to actually write the data */
|
|
s->s2->wpend_tot=olen;
|
|
s->s2->wpend_buf=buf;
|
|
|
|
s->s2->wpend_ret=len;
|
|
|
|
s->s2->wpend_off=0;
|
|
return(write_pending(s,buf,olen));
|
|
}
|
|
|
|
int ssl2_part_read(SSL *s, unsigned long f, int i)
|
|
{
|
|
unsigned char *p;
|
|
int j;
|
|
|
|
if (i < 0)
|
|
{
|
|
/* ssl2_return_error(s); */
|
|
/* for non-blocking io,
|
|
* this is not necessarily fatal */
|
|
return(i);
|
|
}
|
|
else
|
|
{
|
|
s->init_num+=i;
|
|
|
|
/* Check for error. While there are recoverable errors,
|
|
* this function is not called when those must be expected;
|
|
* any error detected here is fatal. */
|
|
if (s->init_num >= 3)
|
|
{
|
|
p=(unsigned char *)s->init_buf->data;
|
|
if (p[0] == SSL2_MT_ERROR)
|
|
{
|
|
j=(p[1]<<8)|p[2];
|
|
SSLerr((int)f,ssl_mt_error(j));
|
|
s->init_num -= 3;
|
|
if (s->init_num > 0)
|
|
memmove(p, p+3, s->init_num);
|
|
}
|
|
}
|
|
|
|
/* If it's not an error message, we have some error anyway --
|
|
* the message was shorter than expected. This too is treated
|
|
* as fatal (at least if SSL_get_error is asked for its opinion). */
|
|
return(0);
|
|
}
|
|
}
|
|
|
|
int ssl2_do_write(SSL *s)
|
|
{
|
|
int ret;
|
|
|
|
ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num);
|
|
if (ret == s->init_num)
|
|
{
|
|
if (s->msg_callback)
|
|
s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);
|
|
return(1);
|
|
}
|
|
if (ret < 0)
|
|
return(-1);
|
|
s->init_off+=ret;
|
|
s->init_num-=ret;
|
|
return(0);
|
|
}
|
|
|
|
static int ssl_mt_error(int n)
|
|
{
|
|
int ret;
|
|
|
|
switch (n)
|
|
{
|
|
case SSL2_PE_NO_CIPHER:
|
|
ret=SSL_R_PEER_ERROR_NO_CIPHER;
|
|
break;
|
|
case SSL2_PE_NO_CERTIFICATE:
|
|
ret=SSL_R_PEER_ERROR_NO_CERTIFICATE;
|
|
break;
|
|
case SSL2_PE_BAD_CERTIFICATE:
|
|
ret=SSL_R_PEER_ERROR_CERTIFICATE;
|
|
break;
|
|
case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE:
|
|
ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE;
|
|
break;
|
|
default:
|
|
ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE;
|
|
break;
|
|
}
|
|
return(ret);
|
|
}
|
|
#else /* !OPENSSL_NO_SSL2 */
|
|
|
|
# if PEDANTIC
|
|
static void *dummy=&dummy;
|
|
# endif
|
|
|
|
#endif
|