1/* bio_ndef.c */ 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 81typedef struct ndef_aux_st 82 { 83 /* ASN1 structure this BIO refers to */ 84 ASN1_VALUE *val; 85 const ASN1_ITEM *it; 86 /* Top of the BIO chain */ 87 BIO *ndef_bio; 88 /* Output BIO */ 89 BIO *out; 90 /* Boundary where content is inserted */ 91 unsigned char **boundary; 92 /* DER buffer start */ 93 unsigned char *derbuf; 94 } NDEF_SUPPORT; 95 96static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg); 97static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg); 98static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg); 99static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg); 100 101BIO *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 { 110 ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED); 111 return NULL; 112 } 113 ndef_aux = OPENSSL_malloc(sizeof(NDEF_SUPPORT)); 114 asn_bio = BIO_new(BIO_f_asn1()); 115 116 /* ASN1 bio needs to be next to output BIO */ 117 118 out = BIO_push(asn_bio, out); 119 120 if (!ndef_aux || !asn_bio || !out) 121 goto err; 122 123 BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free); 124 BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free); 125 126 /* Now let callback prepend any digest, cipher etc BIOs 127 * ASN1 structure needs. 128 */ 129 130 sarg.out = out; 131 sarg.ndef_bio = NULL; 132 sarg.boundary = NULL; 133 134 if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0) 135 goto err; 136 137 ndef_aux->val = val; 138 ndef_aux->it = it; 139 ndef_aux->ndef_bio = sarg.ndef_bio; 140 ndef_aux->boundary = sarg.boundary; 141 ndef_aux->out = out; 142 143 BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux); 144 145 return sarg.ndef_bio; 146 147 err: 148 if (asn_bio) 149 BIO_free(asn_bio); 150 if (ndef_aux) 151 OPENSSL_free(ndef_aux); 152 return NULL; 153 } 154 155static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg) 156 { 157 NDEF_SUPPORT *ndef_aux; 158 unsigned char *p; 159 int derlen; 160 161 if (!parg) 162 return 0; 163 164 ndef_aux = *(NDEF_SUPPORT **)parg; 165 166 derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it); 167 p = OPENSSL_malloc(derlen); 168 ndef_aux->derbuf = p; 169 *pbuf = p; 170 derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it); 171 172 if (!*ndef_aux->boundary) 173 return 0; 174 175 *plen = *ndef_aux->boundary - *pbuf; 176 177 return 1; 178 } 179 180static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, 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 198static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg) 199 { 200 NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg; 201 if (!ndef_prefix_free(b, pbuf, plen, parg)) 202 return 0; 203 OPENSSL_free(*pndef_aux); 204 *pndef_aux = NULL; 205 return 1; 206 } 207 208static int 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 = OPENSSL_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 } 244