230 lines
6.1 KiB
C
230 lines
6.1 KiB
C
/*
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* Copyright 2008-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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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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/*
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* The usage is quite simple, initialize an ASN1 structure, get a BIO from it
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* then any data written through the BIO will end up translated to
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* appropriate format on the fly. The data is streamed out and does *not*
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* need to be all held in memory at once. When the BIO is flushed the output
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* is finalized and any signatures etc written out. The BIO is a 'proper'
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* BIO and can handle non blocking I/O correctly. The usage is simple. The
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* 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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/* 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,
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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,
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void *parg);
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/*
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* On success, the returned BIO owns the input BIO as part of its BIO chain.
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* On failure, NULL is returned and the input BIO is owned by the caller.
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*
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* Unfortunately cannot constify this due to CMS_stream() and PKCS7_stream()
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*/
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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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BIO *pop_bio = NULL;
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if (!aux || !aux->asn1_cb) {
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ERR_raise(ERR_LIB_ASN1, ASN1_R_STREAMING_NOT_SUPPORTED);
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return NULL;
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}
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ndef_aux = OPENSSL_zalloc(sizeof(*ndef_aux));
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asn_bio = BIO_new(BIO_f_asn1());
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if (ndef_aux == NULL || asn_bio == NULL)
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goto err;
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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 (out == NULL)
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goto err;
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pop_bio = asn_bio;
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if (BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free) <= 0
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|| BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free) <= 0
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|| BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux) <= 0)
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goto err;
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/*
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* Now let the callback prepend any digest, cipher, etc., that the BIO's
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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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/*
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* The asn1_cb(), must not have mutated asn_bio on error, leaving it in the
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* middle of some partially built, but not returned BIO chain.
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*/
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if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0) {
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/*
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* ndef_aux is now owned by asn_bio so we must not free it in the err
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* clean up block
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*/
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ndef_aux = NULL;
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goto err;
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}
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/*
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* We must not fail now because the callback has prepended additional
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* BIOs to the chain
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*/
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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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return sarg.ndef_bio;
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err:
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/* BIO_pop() is NULL safe */
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(void)BIO_pop(pop_bio);
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BIO_free(asn_bio);
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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 == NULL)
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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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if (derlen < 0)
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return 0;
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if ((p = OPENSSL_malloc(derlen)) == NULL)
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return 0;
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ndef_aux->derbuf = p;
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*pbuf = p;
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ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
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if (*ndef_aux->boundary == NULL)
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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,
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void *parg)
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{
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NDEF_SUPPORT *ndef_aux;
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if (parg == NULL)
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return 0;
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ndef_aux = *(NDEF_SUPPORT **)parg;
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if (ndef_aux == NULL)
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return 0;
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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,
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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 == NULL)
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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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if (derlen < 0)
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return 0;
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if ((p = OPENSSL_malloc(derlen)) == NULL)
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return 0;
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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 == NULL)
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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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