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 77typedef 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 91static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg); 92static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, 93 void *parg); 94static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg); 95static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, 96 void *parg); 97 98BIO *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 if (asn_bio) 146 BIO_free(asn_bio); 147 if (ndef_aux) 148 OPENSSL_free(ndef_aux); 149 return NULL; 150} 151 152static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg) 153{ 154 NDEF_SUPPORT *ndef_aux; 155 unsigned char *p; 156 int derlen; 157 158 if (!parg) 159 return 0; 160 161 ndef_aux = *(NDEF_SUPPORT **)parg; 162 163 derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it); 164 p = OPENSSL_malloc(derlen); 165 if (!p) 166 return 0; 167 168 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, 181 void *parg) 182{ 183 NDEF_SUPPORT *ndef_aux; 184 185 if (!parg) 186 return 0; 187 188 ndef_aux = *(NDEF_SUPPORT **)parg; 189 190 if (ndef_aux->derbuf) 191 OPENSSL_free(ndef_aux->derbuf); 192 193 ndef_aux->derbuf = NULL; 194 *pbuf = NULL; 195 *plen = 0; 196 return 1; 197} 198 199static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, 200 void *parg) 201{ 202 NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg; 203 if (!ndef_prefix_free(b, pbuf, plen, parg)) 204 return 0; 205 OPENSSL_free(*pndef_aux); 206 *pndef_aux = NULL; 207 return 1; 208} 209 210static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg) 211{ 212 NDEF_SUPPORT *ndef_aux; 213 unsigned char *p; 214 int derlen; 215 const ASN1_AUX *aux; 216 ASN1_STREAM_ARG sarg; 217 218 if (!parg) 219 return 0; 220 221 ndef_aux = *(NDEF_SUPPORT **)parg; 222 223 aux = ndef_aux->it->funcs; 224 225 /* Finalize structures */ 226 sarg.ndef_bio = ndef_aux->ndef_bio; 227 sarg.out = ndef_aux->out; 228 sarg.boundary = ndef_aux->boundary; 229 if (aux->asn1_cb(ASN1_OP_STREAM_POST, 230 &ndef_aux->val, ndef_aux->it, &sarg) <= 0) 231 return 0; 232 233 derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it); 234 p = OPENSSL_malloc(derlen); 235 if (!p) 236 return 0; 237 238 ndef_aux->derbuf = p; 239 *pbuf = p; 240 derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it); 241 242 if (!*ndef_aux->boundary) 243 return 0; 244 *pbuf = *ndef_aux->boundary; 245 *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf); 246 247 return 1; 248} 249