/* $OpenBSD: bio_ndef.c,v 1.11 2021/12/25 13:17:48 jsing Exp $ */ /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL * project. */ /* ==================================================================== * Copyright (c) 2008 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * */ #include <openssl/asn1.h> #include <openssl/asn1t.h> #include <openssl/bio.h> #include <openssl/err.h> #include <stdio.h> /* Experimental NDEF ASN1 BIO support routines */ /* The usage is quite simple, initialize an ASN1 structure, * get a BIO from it then any data written through the BIO * will end up translated to approptiate format on the fly. * The data is streamed out and does *not* need to be * all held in memory at once. * * When the BIO is flushed the output is finalized and any * signatures etc written out. * * The BIO is a 'proper' BIO and can handle non blocking I/O * correctly. * * The usage is simple. The implementation is *not*... */ /* BIO support data stored in the ASN1 BIO ex_arg */ typedef struct ndef_aux_st { /* ASN1 structure this BIO refers to */ ASN1_VALUE *val; const ASN1_ITEM *it; /* Top of the BIO chain */ BIO *ndef_bio; /* Output BIO */ BIO *out; /* Boundary where content is inserted */ unsigned char **boundary; /* DER buffer start */ unsigned char *derbuf; } NDEF_SUPPORT; static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg); static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg); static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg); static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg); BIO * BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it) { NDEF_SUPPORT *ndef_aux = NULL; BIO *asn_bio = NULL; const ASN1_AUX *aux = it->funcs; ASN1_STREAM_ARG sarg; if (!aux || !aux->asn1_cb) { ASN1error(ASN1_R_STREAMING_NOT_SUPPORTED); return NULL; } ndef_aux = malloc(sizeof(NDEF_SUPPORT)); asn_bio = BIO_new(BIO_f_asn1()); /* ASN1 bio needs to be next to output BIO */ out = BIO_push(asn_bio, out); if (!ndef_aux || !asn_bio || !out) goto err; BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free); BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free); /* Now let callback prepend any digest, cipher etc BIOs * ASN1 structure needs. */ sarg.out = out; sarg.ndef_bio = NULL; sarg.boundary = NULL; if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0) goto err; ndef_aux->val = val; ndef_aux->it = it; ndef_aux->ndef_bio = sarg.ndef_bio; ndef_aux->boundary = sarg.boundary; ndef_aux->out = out; BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux); return sarg.ndef_bio; err: BIO_free(asn_bio); free(ndef_aux); return NULL; } static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg) { NDEF_SUPPORT *ndef_aux; unsigned char *p; int derlen; if (!parg) return 0; ndef_aux = *(NDEF_SUPPORT **)parg; derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it); p = malloc(derlen); ndef_aux->derbuf = p; *pbuf = p; derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it); if (!*ndef_aux->boundary) return 0; *plen = *ndef_aux->boundary - *pbuf; return 1; } static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg) { NDEF_SUPPORT *ndef_aux; if (!parg) return 0; ndef_aux = *(NDEF_SUPPORT **)parg; free(ndef_aux->derbuf); ndef_aux->derbuf = NULL; *pbuf = NULL; *plen = 0; return 1; } static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg) { NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg; if (!ndef_prefix_free(b, pbuf, plen, parg)) return 0; free(*pndef_aux); *pndef_aux = NULL; return 1; } static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg) { NDEF_SUPPORT *ndef_aux; unsigned char *p; int derlen; const ASN1_AUX *aux; ASN1_STREAM_ARG sarg; if (!parg) return 0; ndef_aux = *(NDEF_SUPPORT **)parg; aux = ndef_aux->it->funcs; /* Finalize structures */ sarg.ndef_bio = ndef_aux->ndef_bio; sarg.out = ndef_aux->out; sarg.boundary = ndef_aux->boundary; if (aux->asn1_cb(ASN1_OP_STREAM_POST, &ndef_aux->val, ndef_aux->it, &sarg) <= 0) return 0; derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it); p = malloc(derlen); ndef_aux->derbuf = p; *pbuf = p; derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it); if (!*ndef_aux->boundary) return 0; *pbuf = *ndef_aux->boundary; *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf); return 1; }
