crypto/asn1/bio_ndef.c

   1 /* bio_ndef.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   4  * project.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  */
  55
  56 #include <openssl/asn1.h>
  57 #include <openssl/asn1t.h>
  58 #include <openssl/bio.h>
  59 #include <openssl/err.h>
  60
  61 #include <stdio.h>
  62
  63 /* Experimental NDEF ASN1 BIO support routines */
  64
  65 /*
  66  * The usage is quite simple, initialize an ASN1 structure, get a BIO from it
  67  * then any data written through the BIO will end up translated to
  68  * approptiate format on the fly. The data is streamed out and does *not*
  69  * need to be all held in memory at once. When the BIO is flushed the output
  70  * is finalized and any signatures etc written out. The BIO is a 'proper'
  71  * BIO and can handle non blocking I/O correctly. The usage is simple. The
  72  * implementation is *not*...
  73  */
  74
  75 /* BIO support data stored in the ASN1 BIO ex_arg */
  76
  77 typedef struct ndef_aux_st {
  78     /* ASN1 structure this BIO refers to */
  79     ASN1_VALUE *val;
  80     const ASN1_ITEM *it;
  81     /* Top of the BIO chain */
  82     BIO *ndef_bio;
  83     /* Output BIO */
  84     BIO *out;
  85     /* Boundary where content is inserted */
  86     unsigned char **boundary;
  87     /* DER buffer start */
  88     unsigned char *derbuf;
  89 } NDEF_SUPPORT;
  90
  91 static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
  92 static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen,
  93                             void *parg);
  94 static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
  95 static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen,
  96                             void *parg);
  97
  98 BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
  99 {
 100     NDEF_SUPPORT *ndef_aux = NULL;
 101     BIO *asn_bio = NULL;
 102     const ASN1_AUX *aux = it->funcs;
 103     ASN1_STREAM_ARG sarg;
 104
 105     if (!aux || !aux->asn1_cb) {
 106         ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED);
 107         return NULL;
 108     }
 109     ndef_aux = OPENSSL_malloc(sizeof(NDEF_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     if (!ndef_aux || !asn_bio || !out)
 117         goto err;
 118
 119     BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
 120     BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
 121
 122     /*
 123      * Now let callback prepend any digest, cipher etc BIOs ASN1 structure
 124      * needs.
 125      */
 126
 127     sarg.out = out;
 128     sarg.ndef_bio = NULL;
 129     sarg.boundary = NULL;
 130
 131     if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
 132         goto err;
 133
 134     ndef_aux->val = val;
 135     ndef_aux->it = it;
 136     ndef_aux->ndef_bio = sarg.ndef_bio;
 137     ndef_aux->boundary = sarg.boundary;
 138     ndef_aux->out = out;
 139
 140     BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
 141
 142     return sarg.ndef_bio;
 143
 144  err:
 145     BIO_free(asn_bio);
 146     if (ndef_aux)
 147         OPENSSL_free(ndef_aux);
 148     return NULL;
 149 }
 150
 151 static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
 152 {
 153     NDEF_SUPPORT *ndef_aux;
 154     unsigned char *p;
 155     int derlen;
 156
 157     if (!parg)
 158         return 0;
 159
 160     ndef_aux = *(NDEF_SUPPORT **)parg;
 161
 162     derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
 163     p = OPENSSL_malloc(derlen);
 164     if (!p)
 165         return 0;
 166
 167     ndef_aux->derbuf = p;
 168     *pbuf = p;
 169     derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
 170
 171     if (!*ndef_aux->boundary)
 172         return 0;
 173
 174     *plen = *ndef_aux->boundary - *pbuf;
 175
 176     return 1;
 177 }
 178
 179 static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen,
 180                             void *parg)
 181 {
 182     NDEF_SUPPORT *ndef_aux;
 183
 184     if (!parg)
 185         return 0;
 186
 187     ndef_aux = *(NDEF_SUPPORT **)parg;
 188
 189     if (ndef_aux->derbuf)
 190         OPENSSL_free(ndef_aux->derbuf);
 191
 192     ndef_aux->derbuf = NULL;
 193     *pbuf = NULL;
 194     *plen = 0;
 195     return 1;
 196 }
 197
 198 static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen,
 199                             void *parg)
 200 {
 201     NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg;
 202     if (!ndef_prefix_free(b, pbuf, plen, parg))
 203         return 0;
 204     OPENSSL_free(*pndef_aux);
 205     *pndef_aux = NULL;
 206     return 1;
 207 }
 208
 209 static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
 210 {
 211     NDEF_SUPPORT *ndef_aux;
 212     unsigned char *p;
 213     int derlen;
 214     const ASN1_AUX *aux;
 215     ASN1_STREAM_ARG sarg;
 216
 217     if (!parg)
 218         return 0;
 219
 220     ndef_aux = *(NDEF_SUPPORT **)parg;
 221
 222     aux = ndef_aux->it->funcs;
 223
 224     /* Finalize structures */
 225     sarg.ndef_bio = ndef_aux->ndef_bio;
 226     sarg.out = ndef_aux->out;
 227     sarg.boundary = ndef_aux->boundary;
 228     if (aux->asn1_cb(ASN1_OP_STREAM_POST,
 229                      &ndef_aux->val, ndef_aux->it, &sarg) <= 0)
 230         return 0;
 231
 232     derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
 233     p = OPENSSL_malloc(derlen);
 234     if (!p)
 235         return 0;
 236
 237     ndef_aux->derbuf = p;
 238     *pbuf = p;
 239     derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
 240
 241     if (!*ndef_aux->boundary)
 242         return 0;
 243     *pbuf = *ndef_aux->boundary;
 244     *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf);
 245
 246     return 1;
 247 }