* [including the GNU Public Licence.]
*/
/* ====================================================================
- * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
+ * 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
*/
#include "ssl_locl.h"
-#ifndef NO_SSL2
+#ifndef OPENSSL_NO_SSL2
#include <stdio.h>
#include <errno.h>
#define USE_SOCKETS
unsigned char mac[MAX_MAC_SIZE];
unsigned char *p;
int i;
- unsigned int mac_size=0;
+ unsigned int mac_size;
- if (peek)
- {
- SSLerr(SSL_F_SSL2_READ_INTERNAL, SSL_R_FIXME); /* proper implementation not yet completed */
- return -1;
- }
-
-ssl2_read_again:
+ ssl2_read_again:
if (SSL_in_init(s) && !s->in_handshake)
{
n=s->handshake_func(s);
n=len;
memcpy(buf,s->s2->ract_data,(unsigned int)n);
- s->s2->ract_data_length-=n;
- s->s2->ract_data+=n;
- if (s->s2->ract_data_length == 0)
- s->rstate=SSL_ST_READ_HEADER;
+ 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)
/* Data portion */
if (s->s2->clear_text)
{
+ mac_size = 0;
s->s2->mac_data=p;
s->s2->ract_data=p;
- s->s2->pad_data=NULL;
+ if (s->s2->padding)
+ {
+ SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING);
+ return(-1);
+ }
}
else
{
mac_size=EVP_MD_size(s->read_hash);
+ OPENSSL_assert(mac_size <= MAX_MAC_SIZE);
s->s2->mac_data=p;
s->s2->ract_data= &p[mac_size];
- s->s2->pad_data= &p[mac_size+
- s->s2->rlength-s->s2->padding];
+ 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;
INC32(s->s2->read_sequence); /* expect next number */
/* s->s2->ract_data is now available for processing */
-#if 1
- /* How should we react when a packet containing 0
- * bytes is received? (Note that SSLeay/OpenSSL itself
- * never sends such packets; see ssl2_write.)
- * Returning 0 would be interpreted by the caller as
- * indicating EOF, so it's not a good idea.
- * Instead, we just continue reading. Note that using
- * select() for blocking sockets *never* guarantees
+ /* 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. */
+ * 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
- /* If a 0 byte packet was sent, return 0, otherwise
- * we play havoc with people using select with
- * blocking sockets. Let them handle a packet at a time,
- * they should really be using non-blocking sockets. */
- if (s->s2->ract_data_length == 0)
- return(0);
- return(ssl2_read(s,buf,len));
-#endif
+ * "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
{
return ssl2_read_internal(s, buf, len, 0);
}
-int ssl2_peek(SSL *s, char *buf, int len)
+int ssl2_peek(SSL *s, void *buf, int len)
{
return ssl2_read_internal(s, buf, len, 1);
}
{
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))
{
}
else if ((bs <= 1) && (!s->s2->escape))
{
- /* len=len; */
+ /* 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 /* 3 byte header */
+ else /* we may have to use a 3 byte header */
{
- /*len=len; */
+ /* 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 p == 0, it is a 2 byte header */
+ * (if it is a two-byte header, then p == 0) */
s->s2->wlength=len;
s->s2->padding=p;
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
+ memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */
if (!s->s2->clear_text)
{
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 */
+ * 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);
}
}
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;
}
return(ret);
}
-#else /* !NO_SSL2 */
+#else /* !OPENSSL_NO_SSL2 */
# if PEDANTIC
static void *dummy=&dummy;
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