ssl/record/ssl3_buffer.c

   1 /* ssl/record/ssl3_buffer.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include "../ssl_locl.h"
 113 #include "record_locl.h"
 114
 115 void SSL3_BUFFER_set_data(SSL3_BUFFER *b, const unsigned char *d, int n)
 116 {
 117     if (d != NULL)
 118         memcpy(b->buf, d, n);
 119     b->left = n;
 120     b->offset = 0;
 121 }
 122
 123 /*
 124  * Clear the contents of an SSL3_BUFFER but retain any memory allocated
 125  */
 126 void SSL3_BUFFER_clear(SSL3_BUFFER *b)
 127 {
 128     unsigned char *buf = b->buf;
 129     size_t len = b->len;
 130
 131     memset(b, 0, sizeof(*b));
 132     b->buf = buf;
 133     b->len = len;
 134 }
 135
 136 void SSL3_BUFFER_release(SSL3_BUFFER *b)
 137 {
 138     OPENSSL_free(b->buf);
 139     b->buf = NULL;
 140 }
 141
 142 int ssl3_setup_read_buffer(SSL *s)
 143 {
 144     unsigned char *p;
 145     size_t len, align = 0, headerlen;
 146     SSL3_BUFFER *b;
 147
 148     b = RECORD_LAYER_get_rbuf(&s->rlayer);
 149
 150     if (SSL_IS_DTLS(s))
 151         headerlen = DTLS1_RT_HEADER_LENGTH;
 152     else
 153         headerlen = SSL3_RT_HEADER_LENGTH;
 154
 155 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 156     align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);
 157 #endif
 158
 159     if (b->buf == NULL) {
 160         len = SSL3_RT_MAX_PLAIN_LENGTH
 161             + SSL3_RT_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
 162         if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER) {
 163             s->s3->init_extra = 1;
 164             len += SSL3_RT_MAX_EXTRA;
 165         }
 166 #ifndef OPENSSL_NO_COMP
 167         if (ssl_allow_compression(s))
 168             len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
 169 #endif
 170         if ((p = OPENSSL_malloc(len)) == NULL)
 171             goto err;
 172         b->buf = p;
 173         b->len = len;
 174     }
 175
 176     RECORD_LAYER_set_packet(&s->rlayer, &(b->buf[0]));
 177     return 1;
 178
 179  err:
 180     SSLerr(SSL_F_SSL3_SETUP_READ_BUFFER, ERR_R_MALLOC_FAILURE);
 181     return 0;
 182 }
 183
 184 int ssl3_setup_write_buffer(SSL *s)
 185 {
 186     unsigned char *p;
 187     size_t len, align = 0, headerlen;
 188     SSL3_BUFFER *wb;
 189
 190     wb = RECORD_LAYER_get_wbuf(&s->rlayer);
 191
 192     if (SSL_IS_DTLS(s))
 193         headerlen = DTLS1_RT_HEADER_LENGTH + 1;
 194     else
 195         headerlen = SSL3_RT_HEADER_LENGTH;
 196
 197 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
 198     align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);
 199 #endif
 200
 201     if (wb->buf == NULL) {
 202         len = s->max_send_fragment
 203             + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
 204 #ifndef OPENSSL_NO_COMP
 205         if (ssl_allow_compression(s))
 206             len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
 207 #endif
 208         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 209             len += headerlen + align + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;
 210
 211         if ((p = OPENSSL_malloc(len)) == NULL)
 212             goto err;
 213         wb->buf = p;
 214         wb->len = len;
 215     }
 216
 217     return 1;
 218
 219  err:
 220     SSLerr(SSL_F_SSL3_SETUP_WRITE_BUFFER, ERR_R_MALLOC_FAILURE);
 221     return 0;
 222 }
 223
 224 int ssl3_setup_buffers(SSL *s)
 225 {
 226     if (!ssl3_setup_read_buffer(s))
 227         return 0;
 228     if (!ssl3_setup_write_buffer(s))
 229         return 0;
 230     return 1;
 231 }
 232
 233 int ssl3_release_write_buffer(SSL *s)
 234 {
 235     SSL3_BUFFER *wb;
 236
 237     wb = RECORD_LAYER_get_wbuf(&s->rlayer);
 238
 239     OPENSSL_free(wb->buf);
 240     wb->buf = NULL;
 241     return 1;
 242 }
 243
 244 int ssl3_release_read_buffer(SSL *s)
 245 {
 246     SSL3_BUFFER *b;
 247
 248     b = RECORD_LAYER_get_rbuf(&s->rlayer);
 249     OPENSSL_free(b->buf);
 250     b->buf = NULL;
 251     return 1;
 252 }