lib/libcrypto/asn1/bio_ndef.c

   1 /* $OpenBSD: bio_ndef.c,v 1.10 2017/01/29 17:49:22 beck Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2008 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  */
  54
  55 #include <openssl/asn1.h>
  56 #include <openssl/asn1t.h>
  57 #include <openssl/bio.h>
  58 #include <openssl/err.h>
  59
  60 #include <stdio.h>
  61
  62 /* Experimental NDEF ASN1 BIO support routines */
  63
  64 /* The usage is quite simple, initialize an ASN1 structure,
  65  * get a BIO from it then any data written through the BIO
  66  * will end up translated to approptiate format on the fly.
  67  * The data is streamed out and does *not* need to be
  68  * all held in memory at once.
  69  *
  70  * When the BIO is flushed the output is finalized and any
  71  * signatures etc written out.
  72  *
  73  * The BIO is a 'proper' BIO and can handle non blocking I/O
  74  * correctly.
  75  *
  76  * The usage is simple. The implementation is *not*...
  77  */
  78
  79 /* BIO support data stored in the ASN1 BIO ex_arg */
  80
  81 typedef struct ndef_aux_st {
  82         /* ASN1 structure this BIO refers to */
  83         ASN1_VALUE *val;
  84         const ASN1_ITEM *it;
  85         /* Top of the BIO chain */
  86         BIO *ndef_bio;
  87         /* Output BIO */
  88         BIO *out;
  89         /* Boundary where content is inserted */
  90         unsigned char **boundary;
  91         /* DER buffer start */
  92         unsigned char *derbuf;
  93 } NDEF_SUPPORT;
  94
  95 static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
  96 static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
  97 static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
  98 static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
  99
 100 BIO *
 101 BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
 102 {
 103         NDEF_SUPPORT *ndef_aux = NULL;
 104         BIO *asn_bio = NULL;
 105         const ASN1_AUX *aux = it->funcs;
 106         ASN1_STREAM_ARG sarg;
 107
 108         if (!aux || !aux->asn1_cb) {
 109                 ASN1error(ASN1_R_STREAMING_NOT_SUPPORTED);
 110                 return NULL;
 111         }
 112         ndef_aux = malloc(sizeof(NDEF_SUPPORT));
 113         asn_bio = BIO_new(BIO_f_asn1());
 114
 115         /* ASN1 bio needs to be next to output BIO */
 116
 117         out = BIO_push(asn_bio, out);
 118
 119         if (!ndef_aux || !asn_bio || !out)
 120                 goto err;
 121
 122         BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
 123         BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
 124
 125         /* Now let callback prepend any digest, cipher etc BIOs
 126          * ASN1 structure needs.
 127          */
 128
 129         sarg.out = out;
 130         sarg.ndef_bio = NULL;
 131         sarg.boundary = NULL;
 132
 133         if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
 134                 goto err;
 135
 136         ndef_aux->val = val;
 137         ndef_aux->it = it;
 138         ndef_aux->ndef_bio = sarg.ndef_bio;
 139         ndef_aux->boundary = sarg.boundary;
 140         ndef_aux->out = out;
 141
 142         BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
 143
 144         return sarg.ndef_bio;
 145
 146 err:
 147         BIO_free(asn_bio);
 148         free(ndef_aux);
 149         return NULL;
 150 }
 151
 152 static int
 153 ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
 154 {
 155         NDEF_SUPPORT *ndef_aux;
 156         unsigned char *p;
 157         int derlen;
 158
 159         if (!parg)
 160                 return 0;
 161
 162         ndef_aux = *(NDEF_SUPPORT **)parg;
 163
 164         derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
 165         p = malloc(derlen);
 166         ndef_aux->derbuf = p;
 167         *pbuf = p;
 168         derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
 169
 170         if (!*ndef_aux->boundary)
 171                 return 0;
 172
 173         *plen = *ndef_aux->boundary - *pbuf;
 174
 175         return 1;
 176 }
 177
 178 static int
 179 ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
 180 {
 181         NDEF_SUPPORT *ndef_aux;
 182
 183         if (!parg)
 184                 return 0;
 185
 186         ndef_aux = *(NDEF_SUPPORT **)parg;
 187
 188         free(ndef_aux->derbuf);
 189
 190         ndef_aux->derbuf = NULL;
 191         *pbuf = NULL;
 192         *plen = 0;
 193         return 1;
 194 }
 195
 196 static int
 197 ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
 198 {
 199         NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg;
 200         if (!ndef_prefix_free(b, pbuf, plen, parg))
 201                 return 0;
 202         free(*pndef_aux);
 203         *pndef_aux = NULL;
 204         return 1;
 205 }
 206
 207 static int
 208 ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
 209 {
 210         NDEF_SUPPORT *ndef_aux;
 211         unsigned char *p;
 212         int derlen;
 213         const ASN1_AUX *aux;
 214         ASN1_STREAM_ARG sarg;
 215
 216         if (!parg)
 217                 return 0;
 218
 219         ndef_aux = *(NDEF_SUPPORT **)parg;
 220
 221         aux = ndef_aux->it->funcs;
 222
 223         /* Finalize structures */
 224         sarg.ndef_bio = ndef_aux->ndef_bio;
 225         sarg.out = ndef_aux->out;
 226         sarg.boundary = ndef_aux->boundary;
 227         if (aux->asn1_cb(ASN1_OP_STREAM_POST,
 228             &ndef_aux->val, ndef_aux->it, &sarg) <= 0)
 229                 return 0;
 230
 231         derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
 232         p = malloc(derlen);
 233         ndef_aux->derbuf = p;
 234         *pbuf = p;
 235         derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
 236
 237         if (!*ndef_aux->boundary)
 238                 return 0;
 239         *pbuf = *ndef_aux->boundary;
 240         *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf);
 241
 242         return 1;
 243 }