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244 lines
6.8 KiB
C
244 lines
6.8 KiB
C
/* bio_ndef.c */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project.
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*/
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/* ====================================================================
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* Copyright (c) 2008 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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*/
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include <openssl/bio.h>
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#include <openssl/err.h>
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#include <stdio.h>
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/* Experimental NDEF ASN1 BIO support routines */
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/* The usage is quite simple, initialize an ASN1 structure,
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* get a BIO from it then any data written through the BIO
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* will end up translated to approptiate format on the fly.
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* The data is streamed out and does *not* need to be
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* all held in memory at once.
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*
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* When the BIO is flushed the output is finalized and any
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* signatures etc written out.
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*
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* The BIO is a 'proper' BIO and can handle non blocking I/O
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* correctly.
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*
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* The usage is simple. The implementation is *not*...
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*/
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/* BIO support data stored in the ASN1 BIO ex_arg */
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typedef struct ndef_aux_st
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{
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/* ASN1 structure this BIO refers to */
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ASN1_VALUE *val;
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const ASN1_ITEM *it;
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/* Top of the BIO chain */
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BIO *ndef_bio;
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/* Output BIO */
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BIO *out;
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/* Boundary where content is inserted */
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unsigned char **boundary;
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/* DER buffer start */
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unsigned char *derbuf;
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} NDEF_SUPPORT;
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static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
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static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
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static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
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static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
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BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
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{
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NDEF_SUPPORT *ndef_aux = NULL;
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BIO *asn_bio = NULL;
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const ASN1_AUX *aux = it->funcs;
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ASN1_STREAM_ARG sarg;
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if (!aux || !aux->asn1_cb)
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{
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ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED);
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return NULL;
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}
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ndef_aux = OPENSSL_malloc(sizeof(NDEF_SUPPORT));
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asn_bio = BIO_new(BIO_f_asn1());
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/* ASN1 bio needs to be next to output BIO */
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out = BIO_push(asn_bio, out);
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if (!ndef_aux || !asn_bio || !out)
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goto err;
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BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
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BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
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/* Now let callback prepend any digest, cipher etc BIOs
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* ASN1 structure needs.
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*/
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sarg.out = out;
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sarg.ndef_bio = NULL;
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sarg.boundary = NULL;
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if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
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goto err;
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ndef_aux->val = val;
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ndef_aux->it = it;
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ndef_aux->ndef_bio = sarg.ndef_bio;
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ndef_aux->boundary = sarg.boundary;
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ndef_aux->out = out;
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BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
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return sarg.ndef_bio;
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err:
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if (asn_bio)
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BIO_free(asn_bio);
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if (ndef_aux)
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OPENSSL_free(ndef_aux);
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return NULL;
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}
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static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
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{
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NDEF_SUPPORT *ndef_aux;
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unsigned char *p;
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int derlen;
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if (!parg)
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return 0;
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ndef_aux = *(NDEF_SUPPORT **)parg;
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derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
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p = OPENSSL_malloc(derlen);
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ndef_aux->derbuf = p;
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*pbuf = p;
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derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
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if (!*ndef_aux->boundary)
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return 0;
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*plen = *ndef_aux->boundary - *pbuf;
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return 1;
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}
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static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
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{
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NDEF_SUPPORT *ndef_aux;
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if (!parg)
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return 0;
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ndef_aux = *(NDEF_SUPPORT **)parg;
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if (ndef_aux->derbuf)
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OPENSSL_free(ndef_aux->derbuf);
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ndef_aux->derbuf = NULL;
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*pbuf = NULL;
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*plen = 0;
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return 1;
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}
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static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
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{
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NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg;
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if (!ndef_prefix_free(b, pbuf, plen, parg))
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return 0;
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OPENSSL_free(*pndef_aux);
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*pndef_aux = NULL;
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return 1;
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}
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static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
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{
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NDEF_SUPPORT *ndef_aux;
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unsigned char *p;
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int derlen;
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const ASN1_AUX *aux;
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ASN1_STREAM_ARG sarg;
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if (!parg)
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return 0;
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ndef_aux = *(NDEF_SUPPORT **)parg;
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aux = ndef_aux->it->funcs;
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/* Finalize structures */
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sarg.ndef_bio = ndef_aux->ndef_bio;
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sarg.out = ndef_aux->out;
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sarg.boundary = ndef_aux->boundary;
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if (aux->asn1_cb(ASN1_OP_STREAM_POST,
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&ndef_aux->val, ndef_aux->it, &sarg) <= 0)
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return 0;
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derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
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p = OPENSSL_malloc(derlen);
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ndef_aux->derbuf = p;
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*pbuf = p;
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derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
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if (!*ndef_aux->boundary)
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return 0;
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*pbuf = *ndef_aux->boundary;
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*plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf);
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return 1;
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}
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