You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
725 lines
24 KiB
725 lines
24 KiB
/* 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)) { |
|
if (!ssl2_enc(s, 0)) { |
|
SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_DECRYPTION_FAILED); |
|
return (-1); |
|
} |
|
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]); |
|
|
|
/* |
|
* It would be clearer to write this as follows: |
|
* if (mac_size + len + p > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) |
|
* However |len| is user input that could in theory be very large. We |
|
* know |mac_size| and |p| are small, so to avoid any possibility of |
|
* overflow we write it like this. |
|
* |
|
* In theory this should never fail because the logic above should have |
|
* modified |len| if it is too big. But we are being cautious. |
|
*/ |
|
if (len > (SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER - (mac_size + p))) { |
|
return -1; |
|
} |
|
/* 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; |
|
if (ssl2_enc(s, 1) < 1) |
|
return -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
|
|
|