651 lines
15 KiB
C
651 lines
15 KiB
C
/* ssl/s2_pkt.c */
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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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/* SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_NO_CIPHER);
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* SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_NO_CERTIFICATE);
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* SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_CERTIFICATE);
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* SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE);
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* SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_UNKNOWN_REMOTE_ERROR_TYPE);
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*/
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#ifndef NOPROTO
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static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend);
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static int do_ssl_write(SSL *s, const char *buf, unsigned int len);
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static int write_pending(SSL *s, const char *buf, unsigned int len);
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static int ssl_mt_error(int n);
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#else
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static int read_n();
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static int do_ssl_write();
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static int write_pending();
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static int ssl_mt_error();
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#endif
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int ssl2_peek(s,buf,len)
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SSL *s;
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char *buf;
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int len;
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{
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int ret;
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ret=ssl2_read(s,buf,len);
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if (ret > 0)
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{
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s->s2->ract_data_length+=ret;
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s->s2->ract_data-=ret;
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}
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return(ret);
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}
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/* SSL_read -
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* This routine will return 0 to len bytes, decrypted etc if required.
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*/
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int ssl2_read(s, buf, len)
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SSL *s;
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char *buf;
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int len;
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{
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int n;
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unsigned char mac[MAX_MAC_SIZE];
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unsigned char *p;
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int i;
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unsigned int mac_size=0;
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if (SSL_in_init(s) && !s->in_handshake)
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{
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n=s->handshake_func(s);
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if (n < 0) return(n);
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if (n == 0)
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{
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SSLerr(SSL_F_SSL2_READ,SSL_R_SSL_HANDSHAKE_FAILURE);
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return(-1);
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}
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}
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clear_sys_error();
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s->rwstate=SSL_NOTHING;
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if (len <= 0) return(len);
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if (s->s2->ract_data_length != 0) /* read from buffer */
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{
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if (len > s->s2->ract_data_length)
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n=s->s2->ract_data_length;
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else
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n=len;
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memcpy(buf,s->s2->ract_data,(unsigned int)n);
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s->s2->ract_data_length-=n;
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s->s2->ract_data+=n;
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if (s->s2->ract_data_length == 0)
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s->rstate=SSL_ST_READ_HEADER;
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return(n);
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}
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if (s->rstate == SSL_ST_READ_HEADER)
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{
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if (s->first_packet)
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{
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n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
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if (n <= 0) return(n); /* error or non-blocking */
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s->first_packet=0;
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p=s->packet;
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if (!((p[0] & 0x80) && (
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(p[2] == SSL2_MT_CLIENT_HELLO) ||
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(p[2] == SSL2_MT_SERVER_HELLO))))
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{
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SSLerr(SSL_F_SSL2_READ,SSL_R_NON_SSLV2_INITIAL_PACKET);
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return(-1);
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}
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}
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else
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{
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n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0);
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if (n <= 0) return(n); /* error or non-blocking */
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}
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/* part read stuff */
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s->rstate=SSL_ST_READ_BODY;
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p=s->packet;
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/* Do header */
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/*s->s2->padding=0;*/
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s->s2->escape=0;
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s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]);
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if ((p[0] & TWO_BYTE_BIT)) /* Two byte header? */
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{
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s->s2->three_byte_header=0;
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s->s2->rlength&=TWO_BYTE_MASK;
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}
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else
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{
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s->s2->three_byte_header=1;
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s->s2->rlength&=THREE_BYTE_MASK;
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/* security >s2->escape */
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s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0;
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}
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}
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if (s->rstate == SSL_ST_READ_BODY)
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{
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n=s->s2->rlength+2+s->s2->three_byte_header;
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if (n > (int)s->packet_length)
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{
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n-=s->packet_length;
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i=read_n(s,(unsigned int)n,(unsigned int)n,1);
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if (i <= 0) return(i); /* ERROR */
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}
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p= &(s->packet[2]);
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s->rstate=SSL_ST_READ_HEADER;
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if (s->s2->three_byte_header)
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s->s2->padding= *(p++);
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else s->s2->padding=0;
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/* Data portion */
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if (s->s2->clear_text)
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{
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s->s2->mac_data=p;
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s->s2->ract_data=p;
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s->s2->pad_data=NULL;
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}
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else
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{
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mac_size=EVP_MD_size(s->read_hash);
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s->s2->mac_data=p;
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s->s2->ract_data= &p[mac_size];
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s->s2->pad_data= &p[mac_size+
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s->s2->rlength-s->s2->padding];
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}
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s->s2->ract_data_length=s->s2->rlength;
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/* added a check for length > max_size in case
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* encryption was not turned on yet due to an error */
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if ((!s->s2->clear_text) &&
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(s->s2->rlength >= mac_size))
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{
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ssl2_enc(s,0);
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s->s2->ract_data_length-=mac_size;
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ssl2_mac(s,mac,0);
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s->s2->ract_data_length-=s->s2->padding;
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if ( (memcmp(mac,s->s2->mac_data,
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(unsigned int)mac_size) != 0) ||
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(s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0))
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{
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SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_MAC_DECODE);
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return(-1);
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}
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}
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INC32(s->s2->read_sequence); /* expect next number */
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/* s->s2->ract_data is now available for processing */
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/* If a 0 byte packet was sent, return 0, otherwise
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* we play havoc with people using select with
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* blocking sockets. Let them handle a packet at a time,
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* they should really be using non-blocking sockets. */
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if (s->s2->ract_data_length == 0)
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return(0);
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return(ssl2_read(s,buf,len));
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}
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else
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{
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SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_STATE);
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return(-1);
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}
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}
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static int read_n(s, n, max, extend)
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SSL *s;
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unsigned int n;
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unsigned int max;
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unsigned int extend;
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{
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int i,off,newb;
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/* if there is stuff still in the buffer from a previous read,
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* and there is more than we want, take some. */
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if (s->s2->rbuf_left >= (int)n)
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{
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if (extend)
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s->packet_length+=n;
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else
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{
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s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]);
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s->packet_length=n;
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}
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s->s2->rbuf_left-=n;
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s->s2->rbuf_offs+=n;
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return(n);
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}
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if (!s->read_ahead) max=n;
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if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2))
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max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2;
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/* Else we want more than we have.
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* First, if there is some left or we want to extend */
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off=0;
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if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend))
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{
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newb=s->s2->rbuf_left;
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if (extend)
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{
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off=s->packet_length;
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if (s->packet != s->s2->rbuf)
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memcpy(s->s2->rbuf,s->packet,
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(unsigned int)newb+off);
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}
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else if (s->s2->rbuf_offs != 0)
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{
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memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]),
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(unsigned int)newb);
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s->s2->rbuf_offs=0;
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}
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s->s2->rbuf_left=0;
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}
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else
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newb=0;
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/* off is the offset to start writing too.
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* r->s2->rbuf_offs is the 'unread data', now 0.
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* newb is the number of new bytes so far
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*/
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s->packet=s->s2->rbuf;
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while (newb < (int)n)
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{
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clear_sys_error();
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if (s->rbio != NULL)
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{
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s->rwstate=SSL_READING;
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i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]),
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max-newb);
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}
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else
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{
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SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET);
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i= -1;
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}
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#ifdef PKT_DEBUG
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if (s->debug & 0x01) sleep(1);
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#endif
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if (i <= 0)
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{
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s->s2->rbuf_left+=newb;
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return(i);
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}
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newb+=i;
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}
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/* record unread data */
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if (newb > (int)n)
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{
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s->s2->rbuf_offs=n+off;
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s->s2->rbuf_left=newb-n;
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}
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else
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{
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s->s2->rbuf_offs=0;
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s->s2->rbuf_left=0;
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}
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if (extend)
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s->packet_length+=n;
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else
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s->packet_length=n;
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s->rwstate=SSL_NOTHING;
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return(n);
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}
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int ssl2_write(s, buf, len)
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SSL *s;
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const char *buf;
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int len;
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{
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unsigned int n,tot;
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int i;
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if (SSL_in_init(s) && !s->in_handshake)
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{
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i=s->handshake_func(s);
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if (i < 0) return(i);
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if (i == 0)
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{
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SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE);
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return(-1);
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}
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}
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if (s->error)
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{
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ssl2_write_error(s);
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if (s->error)
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return(-1);
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}
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clear_sys_error();
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s->rwstate=SSL_NOTHING;
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if (len <= 0) return(len);
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tot=s->s2->wnum;
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s->s2->wnum=0;
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n=(len-tot);
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for (;;)
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{
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i=do_ssl_write(s,&(buf[tot]),n);
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if (i <= 0)
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{
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s->s2->wnum=tot;
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return(i);
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}
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if (i == (int)n) return(tot+i);
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n-=i;
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tot+=i;
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}
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}
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static int write_pending(s,buf,len)
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SSL *s;
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const char *buf;
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unsigned int len;
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{
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int i;
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/* s->s2->wpend_len != 0 MUST be true. */
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/* check that they have given us the same buffer to
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* write */
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if ((s->s2->wpend_tot > (int)len) || (s->s2->wpend_buf != buf))
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{
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SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY);
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return(-1);
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}
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for (;;)
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{
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clear_sys_error();
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if (s->wbio != NULL)
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{
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s->rwstate=SSL_WRITING;
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i=BIO_write(s->wbio,
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(char *)&(s->s2->write_ptr[s->s2->wpend_off]),
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(unsigned int)s->s2->wpend_len);
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}
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else
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{
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SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET);
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i= -1;
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}
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#ifdef PKT_DEBUG
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if (s->debug & 0x01) sleep(1);
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#endif
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if (i == s->s2->wpend_len)
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{
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s->s2->wpend_len=0;
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s->rwstate=SSL_NOTHING;
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return(s->s2->wpend_ret);
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}
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else if (i <= 0)
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return(i);
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s->s2->wpend_off+=i;
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s->s2->wpend_len-=i;
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}
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}
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static int do_ssl_write(s, buf, len)
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SSL *s;
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const char *buf;
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unsigned int len;
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{
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unsigned int j,k,olen,p,mac_size,bs;
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register unsigned char *pp;
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olen=len;
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/* first check if there is data from an encryption waiting to
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* be sent - it must be sent because the other end is waiting.
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* This will happen with non-blocking IO. We print it and then
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* return.
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*/
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if (s->s2->wpend_len != 0) return(write_pending(s,buf,len));
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/* set mac_size to mac size */
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if (s->s2->clear_text)
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mac_size=0;
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else
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mac_size=EVP_MD_size(s->write_hash);
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/* lets set the pad p */
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if (s->s2->clear_text)
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{
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if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
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len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
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p=0;
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s->s2->three_byte_header=0;
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/* len=len; */
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}
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else
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{
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bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx);
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j=len+mac_size;
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if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) &&
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(!s->s2->escape))
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{
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if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER)
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j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER;
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/* set k to the max number of bytes with 2
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* byte header */
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k=j-(j%bs);
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/* how many data bytes? */
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len=k-mac_size;
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s->s2->three_byte_header=0;
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p=0;
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}
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else if ((bs <= 1) && (!s->s2->escape))
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{
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/* len=len; */
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s->s2->three_byte_header=0;
|
|
p=0;
|
|
}
|
|
else /* 3 byte header */
|
|
{
|
|
/*len=len; */
|
|
p=(j%bs);
|
|
p=(p == 0)?0:(bs-p);
|
|
if (s->s2->escape)
|
|
s->s2->three_byte_header=1;
|
|
else
|
|
s->s2->three_byte_header=(p == 0)?0:1;
|
|
}
|
|
}
|
|
/* 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 p == 0, it is a 2 byte header */
|
|
|
|
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);
|
|
#ifdef PURIFY
|
|
if (p)
|
|
memset(&(s->s2->wact_data[len]),0,p);
|
|
#endif
|
|
|
|
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(s,f,i)
|
|
SSL *s;
|
|
unsigned long f;
|
|
int i;
|
|
{
|
|
unsigned char *p;
|
|
int j;
|
|
|
|
/* check for error */
|
|
if ((s->init_num == 0) && (i >= 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));
|
|
}
|
|
}
|
|
|
|
if (i < 0)
|
|
{
|
|
/* ssl2_return_error(s); */
|
|
/* for non-blocking io,
|
|
* this is not fatal */
|
|
return(i);
|
|
}
|
|
else
|
|
{
|
|
s->init_num+=i;
|
|
return(0);
|
|
}
|
|
}
|
|
|
|
int ssl2_do_write(s)
|
|
SSL *s;
|
|
{
|
|
int ret;
|
|
|
|
ret=ssl2_write(s,(char *)&(s->init_buf->data[s->init_off]),
|
|
s->init_num);
|
|
if (ret == s->init_num)
|
|
return(1);
|
|
if (ret < 0)
|
|
return(-1);
|
|
s->init_off+=ret;
|
|
s->init_num-=ret;
|
|
return(0);
|
|
}
|
|
|
|
static int ssl_mt_error(n)
|
|
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);
|
|
}
|