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#ifndef OPENSSL_SYSNAME_NETWARE 61#include <memory.h> 62#endif 63#include <stdio.h> 64 65/* Experimental NDEF ASN1 BIO support routines */ 66 67/* The usage is quite simple, initialize an ASN1 structure, 68 * get a BIO from it then any data written through the BIO 69 * will end up translated to approptiate format on the fly. 70 * The data is streamed out and does *not* need to be 71 * all held in memory at once. 72 * 73 * When the BIO is flushed the output is finalized and any 74 * signatures etc written out. 75 * 76 * The BIO is a 'proper' BIO and can handle non blocking I/O 77 * correctly. 78 * 79 * The usage is simple. The implementation is *not*... 80 */ 81 82/* BIO support data stored in the ASN1 BIO ex_arg */ 83 84typedef struct ndef_aux_st 85 { 86 /* ASN1 structure this BIO refers to */ 87 ASN1_VALUE *val; 88 const ASN1_ITEM *it; 89 /* Top of the BIO chain */ 90 BIO *ndef_bio; 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 } NDEF_SUPPORT; 98 99static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg); 100static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg); 101static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg); 102static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg); 103 104BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it) 105 { 106 NDEF_SUPPORT *ndef_aux = NULL; 107 BIO *asn_bio = NULL; 108 const ASN1_AUX *aux = it->funcs; 109 ASN1_STREAM_ARG sarg; 110 111 if (!aux || !aux->asn1_cb) 112 { 113 ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED); 114 return NULL; 115 } 116 ndef_aux = OPENSSL_malloc(sizeof(NDEF_SUPPORT)); 117 asn_bio = BIO_new(BIO_f_asn1()); 118 119 /* ASN1 bio needs to be next to output BIO */ 120 121 out = BIO_push(asn_bio, out); 122 123 if (!ndef_aux || !asn_bio || !out) 124 goto err; 125 126 BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free); 127 BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free); 128 129 /* Now let callback prepend any digest, cipher etc BIOs 130 * ASN1 structure needs. 131 */ 132 133 sarg.out = out; 134 sarg.ndef_bio = NULL; 135 sarg.boundary = NULL; 136 137 if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0) 138 goto err; 139 140 ndef_aux->val = val; 141 ndef_aux->it = it; 142 ndef_aux->ndef_bio = sarg.ndef_bio; 143 ndef_aux->boundary = sarg.boundary; 144 ndef_aux->out = out; 145 146 BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux); 147 148 return sarg.ndef_bio; 149 150 err: 151 if (asn_bio) 152 BIO_free(asn_bio); 153 if (ndef_aux) 154 OPENSSL_free(ndef_aux); 155 return NULL; 156 } 157 158static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg) 159 { 160 NDEF_SUPPORT *ndef_aux; 161 unsigned char *p; 162 int derlen; 163 164 if (!parg) 165 return 0; 166 167 ndef_aux = *(NDEF_SUPPORT **)parg; 168 169 derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it); 170 p = OPENSSL_malloc(derlen); 171 ndef_aux->derbuf = p; 172 *pbuf = p; 173 derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it); 174 175 if (!*ndef_aux->boundary) 176 return 0; 177 178 *plen = *ndef_aux->boundary - *pbuf; 179 180 return 1; 181 } 182 183static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg) 184 { 185 NDEF_SUPPORT *ndef_aux; 186 187 if (!parg) 188 return 0; 189 190 ndef_aux = *(NDEF_SUPPORT **)parg; 191 192 if (ndef_aux->derbuf) 193 OPENSSL_free(ndef_aux->derbuf); 194 195 ndef_aux->derbuf = NULL; 196 *pbuf = NULL; 197 *plen = 0; 198 return 1; 199 } 200 201static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg) 202 { 203 NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg; 204 if (!ndef_prefix_free(b, pbuf, plen, parg)) 205 return 0; 206 OPENSSL_free(*pndef_aux); 207 *pndef_aux = NULL; 208 return 1; 209 } 210 211static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg) 212 { 213 NDEF_SUPPORT *ndef_aux; 214 unsigned char *p; 215 int derlen; 216 const ASN1_AUX *aux; 217 ASN1_STREAM_ARG sarg; 218 219 if (!parg) 220 return 0; 221 222 ndef_aux = *(NDEF_SUPPORT **)parg; 223 224 aux = ndef_aux->it->funcs; 225 226 /* Finalize structures */ 227 sarg.ndef_bio = ndef_aux->ndef_bio; 228 sarg.out = ndef_aux->out; 229 sarg.boundary = ndef_aux->boundary; 230 if (aux->asn1_cb(ASN1_OP_STREAM_POST, 231 &ndef_aux->val, ndef_aux->it, &sarg) <= 0) 232 return 0; 233 234 derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it); 235 p = OPENSSL_malloc(derlen); 236 ndef_aux->derbuf = p; 237 *pbuf = p; 238 derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it); 239 240 if (!*ndef_aux->boundary) 241 return 0; 242 *pbuf = *ndef_aux->boundary; 243 *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf); 244 245 return 1; 246 } 247