crypto/pkcs7/bio_pk7.c

   1 /* bio_pk7.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <openssl/asn1.h>
  60 #include <openssl/pkcs7.h>
  61 #include <openssl/bio.h>
  62
  63 #include <memory.h>
  64 #include <stdio.h>
  65
  66 /* Highly experiemental PKCS#7 BIO support routines */
  67
  68 /* The usage is quite simple, initialize a PKCS7 structure,
  69  * get a BIO from it then any data written through the BIO
  70  * will end up translated to PKCS#7 format on the fly.
  71  * The data is streamed out and does *not* need to be
  72  * all held in memory at once.
  73  *
  74  * When the BIO is flushed the output is finalized and any
  75  * signatures etc written out.
  76  *
  77  * The BIO is a 'proper' BIO and can handle non blocking I/O
  78  * correctly.
  79  *
  80  * The usage is simple. The implementation is *not*...
  81  */
  82
  83 /* BIO support data stored in the ASN1 BIO ex_arg */
  84
  85 typedef struct pkcs7_aux_st
  86         {
  87         /* PKCS7 structure this BIO refers to */
  88         PKCS7 *p7;
  89         /* Top of the BIO chain */
  90         BIO *p7bio;
  91         /* Output BIO */
  92         BIO *out;
  93         /* Boundary where content is inserted */
  94         unsigned char **boundary;
  95         /* DER buffer start */
  96         unsigned char *derbuf;
  97         } PKCS7_SUPPORT;
  98
  99 static int pkcs7_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
 100 static int pkcs7_psfix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
 101 static int pkcs7_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
 102
 103 BIO *BIO_new_PKCS7(BIO *out, PKCS7 *p7)
 104         {
 105         PKCS7_SUPPORT *p7aux = NULL;
 106         BIO *p7bio = NULL;
 107         BIO *asn_bio = NULL;
 108         unsigned char **boundary;
 109         p7aux = OPENSSL_malloc(sizeof(PKCS7_SUPPORT));
 110         asn_bio = BIO_new(BIO_f_asn1());
 111
 112         /* ASN1 bio needs to be next to output BIO */
 113
 114         out = BIO_push(asn_bio, out);
 115
 116         BIO_asn1_set_prefix(asn_bio, pkcs7_prefix, pkcs7_psfix_free);
 117         BIO_asn1_set_suffix(asn_bio, pkcs7_suffix, pkcs7_psfix_free);
 118
 119         /* Now initialize BIO for PKCS#7 output */
 120
 121         p7bio = PKCS7_dataInit(p7, out);
 122         PKCS7_stream(&boundary, p7);
 123
 124         p7aux->p7 = p7;
 125         p7aux->p7bio = p7bio;
 126         p7aux->boundary = boundary;
 127         p7aux->out = out;
 128
 129         BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, p7aux);
 130
 131         return p7bio;
 132
 133         }
 134
 135
 136 static int pkcs7_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
 137         {
 138         PKCS7_SUPPORT *p7aux;
 139         unsigned char *p;
 140         int derlen;
 141
 142         if (!parg)
 143                 return 0;
 144
 145         p7aux = *(PKCS7_SUPPORT **)parg;
 146
 147         derlen = i2d_PKCS7_NDEF(p7aux->p7, NULL);
 148         p = OPENSSL_malloc(derlen);
 149         p7aux->derbuf = p;
 150         *pbuf = p;
 151         i2d_PKCS7_NDEF(p7aux->p7, &p);
 152
 153         *plen = *p7aux->boundary - *pbuf;
 154
 155         return 1;
 156         }
 157
 158 static int pkcs7_psfix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
 159         {
 160         PKCS7_SUPPORT *p7aux;
 161
 162         if (!parg)
 163                 return 0;
 164
 165         p7aux = *(PKCS7_SUPPORT **)parg;
 166
 167         if (p7aux->derbuf)
 168                 OPENSSL_free(p7aux->derbuf);
 169
 170         p7aux->derbuf = NULL;
 171         *pbuf = NULL;
 172         *plen = 0;
 173         return 1;
 174         }
 175
 176 static int pkcs7_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
 177         {
 178         PKCS7_SUPPORT *p7aux;
 179         unsigned char *p;
 180         int derlen;
 181
 182         if (!parg)
 183                 return 0;
 184
 185         p7aux = *(PKCS7_SUPPORT **)parg;
 186
 187         /* Finalize structures */
 188         PKCS7_dataFinal(p7aux->p7, p7aux->p7bio);
 189
 190         derlen = i2d_PKCS7_NDEF(p7aux->p7, NULL);
 191         p = OPENSSL_malloc(derlen);
 192         p7aux->derbuf = p;
 193         i2d_PKCS7_NDEF(p7aux->p7, &p);
 194         *pbuf = *p7aux->boundary;
 195         *plen = derlen - (*p7aux->boundary - p7aux->derbuf);
 196
 197         return 1;
 198         }
 199
 200