static int asn1_find_end(const unsigned char **in, long len, char inf)
	{
	int expected_eoc;
	long plen;
	const unsigned char *p = *in, *q;
	/* If not indefinite length constructed just add length */
	if (inf == 0)
		{
		*in += len;
		return 1;
		}
	expected_eoc = 1;
	/* Indefinite length constructed form. Find the end when enough EOCs
	 * are found. If more indefinite length constructed headers
	 * are encountered increment the expected eoc count otherwise just
	 * skip to the end of the data.
	 */
	while (len > 0)
		{
		if(asn1_check_eoc(&p, len))
			{
			expected_eoc--;
			if (expected_eoc == 0)
				break;
			len -= 2;
			continue;
			}
		q = p;
		/* Just read in a header: only care about the length */
		if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
				-1, 0, 0, NULL))
			{
			ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
			return 0;
			}
		if (inf)
			expected_eoc++;
		else
			p += plen;
		len -= p - q;
		}
	if (expected_eoc)
		{
		ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
		return 0;
		}
	*in = p;
	return 1;
	}
Exemple #2
0
static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass)
{
	unsigned char *p, *q;
	long plen;
	char cst, ininf;
	p = *in;
	inf &= 1;
	while(len > 0) {
		q = p;
		/* Check for EOC */
		if(asn1_check_eoc(&p, len)) {
			/* EOC is illegal outside indefinite length constructed form */
			if(!inf) {
				ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC);
				return 0;
			}
			inf = 0;
			break;
		}
		if(!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p, len, tag, aclass, 0, NULL)) {
			ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
			return 0;
		}
		/* If indefinite length constructed update max length */
		if(cst) {
#ifdef OPENSSL_ALLOW_NESTED_ASN1_STRINGS
			if (!asn1_collect(buf, &p, plen, ininf, tag, aclass))
				return 0;
#else
			ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
			return 0;
#endif
		} else {
			if(plen && !collect_data(buf, &p, plen)) return 0;
		}
		len -= p - q;
	}
	if(inf) {
		ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
		return 0;
	}
	*in = p;
	return 1;
}
static int asn1_template_noexp_d2i(ASN1_VALUE **val,
				const unsigned char **in, long len,
				const ASN1_TEMPLATE *tt, char opt,
				ASN1_TLC *ctx)
	{
	int flags, aclass;
	int ret;
	const unsigned char *p, *q;
	if (!val)
		return 0;
	flags = tt->flags;
	aclass = flags & ASN1_TFLG_TAG_CLASS;

	p = *in;
	q = p;

	if (flags & ASN1_TFLG_SK_MASK)
		{
		/* SET OF, SEQUENCE OF */
		int sktag, skaclass;
		char sk_eoc;
		/* First work out expected inner tag value */
		if (flags & ASN1_TFLG_IMPTAG)
			{
			sktag = tt->tag;
			skaclass = aclass;
			}
		else
			{
			skaclass = V_ASN1_UNIVERSAL;
			if (flags & ASN1_TFLG_SET_OF)
				sktag = V_ASN1_SET;
			else
				sktag = V_ASN1_SEQUENCE;
			}
		/* Get the tag */
		ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
					&p, len, sktag, skaclass, opt, ctx);
		if (!ret)
			{
			ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
						ERR_R_NESTED_ASN1_ERROR);
			return 0;
			}
		else if (ret == -1)
			return -1;
		if (!*val)
			*val = (ASN1_VALUE *)sk_new_null();
		else
			{
			/* We've got a valid STACK: free up any items present */
			STACK *sktmp = (STACK *)*val;
			ASN1_VALUE *vtmp;
			while(sk_num(sktmp) > 0)
				{
				vtmp = (ASN1_VALUE *)sk_pop(sktmp);
				ASN1_item_ex_free(&vtmp,
						ASN1_ITEM_ptr(tt->item));
				}
			}
				
		if (!*val)
			{
			ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
						ERR_R_MALLOC_FAILURE);
			goto err;
			}

		/* Read as many items as we can */
		while(len > 0)
			{
			ASN1_VALUE *skfield;
			q = p;
			/* See if EOC found */
			if (asn1_check_eoc(&p, len))
				{
				if (!sk_eoc)
					{
					ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
							ASN1_R_UNEXPECTED_EOC);
					goto err;
					}
				len -= p - q;
				sk_eoc = 0;
				break;
				}
			skfield = NULL;
			if (!ASN1_item_ex_d2i(&skfield, &p, len,
						ASN1_ITEM_ptr(tt->item),
						-1, 0, 0, ctx))
				{
				ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
					ERR_R_NESTED_ASN1_ERROR);
				goto err;
				}
			len -= p - q;
			if (!sk_push((STACK *)*val, (char *)skfield))
				{
				ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
						ERR_R_MALLOC_FAILURE);
				goto err;
				}
			}
		if (sk_eoc)
			{
			ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
			goto err;
			}
		}
	else if (flags & ASN1_TFLG_IMPTAG)
		{
		/* IMPLICIT tagging */
		ret = ASN1_item_ex_d2i(val, &p, len,
			ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
		if (!ret)
			{
			ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
						ERR_R_NESTED_ASN1_ERROR);
			goto err;
			}
		else if (ret == -1)
			return -1;
		}
	else
		{
		/* Nothing special */
		ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
							-1, 0, opt, ctx);
		if (!ret)
			{
			ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
					ERR_R_NESTED_ASN1_ERROR);
			goto err;
			}
		else if (ret == -1)
			return -1;
		}

	*in = p;
	return 1;

	err:
	ASN1_template_free(val, tt);
	return 0;
	}
static int asn1_template_ex_d2i(ASN1_VALUE **val,
				const unsigned char **in, long inlen,
				const ASN1_TEMPLATE *tt, char opt,
							ASN1_TLC *ctx)
	{
	int flags, aclass;
	int ret;
	long len;
	const unsigned char *p, *q;
	char exp_eoc;
	if (!val)
		return 0;
	flags = tt->flags;
	aclass = flags & ASN1_TFLG_TAG_CLASS;

	p = *in;

	/* Check if EXPLICIT tag expected */
	if (flags & ASN1_TFLG_EXPTAG)
		{
		char cst;
		/* Need to work out amount of data available to the inner
		 * content and where it starts: so read in EXPLICIT header to
		 * get the info.
		 */
		ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
					&p, inlen, tt->tag, aclass, opt, ctx);
		q = p;
		if (!ret)
			{
			ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
					ERR_R_NESTED_ASN1_ERROR);
			return 0;
			}
		else if (ret == -1)
			return -1;
		if (!cst)
			{
			ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
					ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
			return 0;
			}
		/* We've found the field so it can't be OPTIONAL now */
		ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
		if (!ret)
			{
			ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
					ERR_R_NESTED_ASN1_ERROR);
			return 0;
			}
		/* We read the field in OK so update length */
		len -= p - q;
		if (exp_eoc)
			{
			/* If NDEF we must have an EOC here */
			if (!asn1_check_eoc(&p, len))
				{
				ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
						ASN1_R_MISSING_EOC);
				goto err;
				}
			}
		else
			{
			/* Otherwise we must hit the EXPLICIT tag end or its
			 * an error */
			if (len)
				{
				ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
					ASN1_R_EXPLICIT_LENGTH_MISMATCH);
				goto err;
				}
			}
		}
		else 
			return asn1_template_noexp_d2i(val, in, inlen,
								tt, opt, ctx);

	*in = p;
	return 1;

	err:
	ASN1_template_free(val, tt);
	return 0;
	}
int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
			const ASN1_ITEM *it,
			int tag, int aclass, char opt, ASN1_TLC *ctx)
	{
	const ASN1_TEMPLATE *tt, *errtt = NULL;
	const ASN1_COMPAT_FUNCS *cf;
	const ASN1_EXTERN_FUNCS *ef;
	const ASN1_AUX *aux = it->funcs;
	ASN1_aux_cb *asn1_cb;
	const unsigned char *p = NULL, *q;
	unsigned char *wp=NULL;	/* BIG FAT WARNING!  BREAKS CONST WHERE USED */
	unsigned char imphack = 0, oclass;
	char seq_eoc, seq_nolen, cst, isopt;
	long tmplen;
	int i;
	int otag;
	int ret = 0;
	ASN1_VALUE **pchptr, *ptmpval;
	if (!pval)
		return 0;
	if (aux && aux->asn1_cb)
		asn1_cb = aux->asn1_cb;
	else asn1_cb = 0;

	switch(it->itype)
		{
		case ASN1_ITYPE_PRIMITIVE:
		if (it->templates)
			{
			/* tagging or OPTIONAL is currently illegal on an item
			 * template because the flags can't get passed down.
			 * In practice this isn't a problem: we include the
			 * relevant flags from the item template in the
			 * template itself.
			 */
			if ((tag != -1) || opt)
				{
				ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
				ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
				goto err;
				}
			return asn1_template_ex_d2i(pval, in, len,
					it->templates, opt, ctx);
		}
		return asn1_d2i_ex_primitive(pval, in, len, it,
						tag, aclass, opt, ctx);
		break;

		case ASN1_ITYPE_MSTRING:
		p = *in;
		/* Just read in tag and class */
		ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
						&p, len, -1, 0, 1, ctx);
		if (!ret)
			{
			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
					ERR_R_NESTED_ASN1_ERROR);
			goto err;
			}

		/* Must be UNIVERSAL class */
		if (oclass != V_ASN1_UNIVERSAL)
			{
			/* If OPTIONAL, assume this is OK */
			if (opt) return -1;
			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
					ASN1_R_MSTRING_NOT_UNIVERSAL);
			goto err;
			}
		/* Check tag matches bit map */
		if (!(ASN1_tag2bit(otag) & it->utype))
			{
			/* If OPTIONAL, assume this is OK */
			if (opt)
				return -1;
			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
					ASN1_R_MSTRING_WRONG_TAG);
			goto err;
			}
		return asn1_d2i_ex_primitive(pval, in, len,
						it, otag, 0, 0, ctx);

		case ASN1_ITYPE_EXTERN:
		/* Use new style d2i */
		ef = it->funcs;
		return ef->asn1_ex_d2i(pval, in, len,
						it, tag, aclass, opt, ctx);

		case ASN1_ITYPE_COMPAT:
		/* we must resort to old style evil hackery */
		cf = it->funcs;

		/* If OPTIONAL see if it is there */
		if (opt)
			{
			int exptag;
			p = *in;
			if (tag == -1)
				exptag = it->utype;
			else exptag = tag;
			/* Don't care about anything other than presence
			 * of expected tag */

			ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL,
					&p, len, exptag, aclass, 1, ctx);
			if (!ret)
				{
				ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
					ERR_R_NESTED_ASN1_ERROR);
				goto err;
				}
			if (ret == -1)
				return -1;
			}

		/* This is the old style evil hack IMPLICIT handling:
		 * since the underlying code is expecting a tag and
		 * class other than the one present we change the
		 * buffer temporarily then change it back afterwards.
		 * This doesn't and never did work for tags > 30.
		 *
		 * Yes this is *horrible* but it is only needed for
		 * old style d2i which will hopefully not be around
		 * for much longer.
		 * FIXME: should copy the buffer then modify it so
		 * the input buffer can be const: we should *always*
		 * copy because the old style d2i might modify the
		 * buffer.
		 */

		if (tag != -1)
			{
			wp = *(unsigned char **)in;
			imphack = *wp;
			if (p == NULL)
				{
				ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
					ERR_R_NESTED_ASN1_ERROR);
				goto err;
				}
			*wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED)
								| it->utype);
			}

		ptmpval = cf->asn1_d2i(pval, in, len);

		if (tag != -1)
			*wp = imphack;

		if (ptmpval)
			return 1;

		ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
		goto err;


		case ASN1_ITYPE_CHOICE:
		if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
				goto auxerr;

		/* Allocate structure */
		if (!*pval && !ASN1_item_ex_new(pval, it))
			{
			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
						ERR_R_NESTED_ASN1_ERROR);
			goto err;
			}
		/* CHOICE type, try each possibility in turn */
		p = *in;
		for (i = 0, tt=it->templates; i < it->tcount; i++, tt++)
			{
			pchptr = asn1_get_field_ptr(pval, tt);
			/* We mark field as OPTIONAL so its absence
			 * can be recognised.
			 */
			ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
			/* If field not present, try the next one */
			if (ret == -1)
				continue;
			/* If positive return, read OK, break loop */
			if (ret > 0)
				break;
			/* Otherwise must be an ASN1 parsing error */
			errtt = tt;
			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
						ERR_R_NESTED_ASN1_ERROR);
			goto err;
			}

		/* Did we fall off the end without reading anything? */
		if (i == it->tcount)
			{
			/* If OPTIONAL, this is OK */
			if (opt)
				{
				/* Free and zero it */
				ASN1_item_ex_free(pval, it);
				return -1;
				}
			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
					ASN1_R_NO_MATCHING_CHOICE_TYPE);
			goto err;
			}

		asn1_set_choice_selector(pval, i, it);
		*in = p;
		if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
				goto auxerr;
		return 1;

		case ASN1_ITYPE_NDEF_SEQUENCE:
		case ASN1_ITYPE_SEQUENCE:
		p = *in;
		tmplen = len;

		/* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
		if (tag == -1)
			{
			tag = V_ASN1_SEQUENCE;
			aclass = V_ASN1_UNIVERSAL;
			}
		/* Get SEQUENCE length and update len, p */
		ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
					&p, len, tag, aclass, opt, ctx);
		if (!ret)
			{
			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
					ERR_R_NESTED_ASN1_ERROR);
			goto err;
			}
		else if (ret == -1)
			return -1;
		if (aux && (aux->flags & ASN1_AFLG_BROKEN))
			{
			len = tmplen - (p - *in);
			seq_nolen = 1;
			}
		/* If indefinite we don't do a length check */
		else seq_nolen = seq_eoc;
		if (!cst)
			{
			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
				ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
			goto err;
			}

		if (!*pval && !ASN1_item_ex_new(pval, it))
			{
			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
				ERR_R_NESTED_ASN1_ERROR);
			goto err;
			}

		if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
				goto auxerr;

		/* Get each field entry */
		for (i = 0, tt = it->templates; i < it->tcount; i++, tt++)
			{
			const ASN1_TEMPLATE *seqtt;
			ASN1_VALUE **pseqval;
			seqtt = asn1_do_adb(pval, tt, 1);
			if (!seqtt)
				goto err;
			pseqval = asn1_get_field_ptr(pval, seqtt);
			/* Have we ran out of data? */
			if (!len)
				break;
			q = p;
			if (asn1_check_eoc(&p, len))
				{
				if (!seq_eoc)
					{
					ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
							ASN1_R_UNEXPECTED_EOC);
					goto err;
					}
				len -= p - q;
				seq_eoc = 0;
				q = p;
				break;
				}
			/* This determines the OPTIONAL flag value. The field
			 * cannot be omitted if it is the last of a SEQUENCE
			 * and there is still data to be read. This isn't
			 * strictly necessary but it increases efficiency in
			 * some cases.
			 */
			if (i == (it->tcount - 1))
				isopt = 0;
			else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
			/* attempt to read in field, allowing each to be
			 * OPTIONAL */

			ret = asn1_template_ex_d2i(pseqval, &p, len,
							seqtt, isopt, ctx);
			if (!ret)
				{
				errtt = seqtt;
				goto err;
				}
			else if (ret == -1)
				{
				/* OPTIONAL component absent.
				 * Free and zero the field.
				 */
				ASN1_template_free(pseqval, seqtt);
				continue;
				}
			/* Update length */
			len -= p - q;
			}

		/* Check for EOC if expecting one */
		if (seq_eoc && !asn1_check_eoc(&p, len))
			{
			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
			goto err;
			}
		/* Check all data read */
		if (!seq_nolen && len)
			{
			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
					ASN1_R_SEQUENCE_LENGTH_MISMATCH);
			goto err;
			}

		/* If we get here we've got no more data in the SEQUENCE,
		 * however we may not have read all fields so check all
		 * remaining are OPTIONAL and clear any that are.
		 */
		for (; i < it->tcount; tt++, i++)
			{
			const ASN1_TEMPLATE *seqtt;
			seqtt = asn1_do_adb(pval, tt, 1);
			if (!seqtt)
				goto err;
			if (seqtt->flags & ASN1_TFLG_OPTIONAL)
				{
				ASN1_VALUE **pseqval;
				pseqval = asn1_get_field_ptr(pval, seqtt);
				ASN1_template_free(pseqval, seqtt);
				}
			else
				{
				errtt = seqtt;
				ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
							ASN1_R_FIELD_MISSING);
				goto err;
				}
			}
		/* Save encoding */
		if (!asn1_enc_save(pval, *in, p - *in, it))
			goto auxerr;
		*in = p;
		if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
				goto auxerr;
		return 1;

		default:
		return 0;
		}
	auxerr:
	ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
	err:
	ASN1_item_ex_free(pval, it);
	if (errtt)
		ERR_add_error_data(4, "Field=", errtt->field_name,
					", Type=", it->sname);
	else
		ERR_add_error_data(2, "Type=", it->sname);
	return 0;
	}
static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
			char inf, int tag, int aclass, int depth)
	{
	const unsigned char *p, *q;
	long plen;
	char cst, ininf;
	p = *in;
	inf &= 1;
	/* If no buffer and not indefinite length constructed just pass over
	 * the encoded data */
	if (!buf && !inf)
		{
		*in += len;
		return 1;
		}
	while(len > 0)
		{
		q = p;
		/* Check for EOC */
		if (asn1_check_eoc(&p, len))
			{
			/* EOC is illegal outside indefinite length
			 * constructed form */
			if (!inf)
				{
				ASN1err(ASN1_F_ASN1_COLLECT,
					ASN1_R_UNEXPECTED_EOC);
				return 0;
				}
			inf = 0;
			break;
			}

		if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
					len, tag, aclass, 0, NULL))
			{
			ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
			return 0;
			}

		/* If indefinite length constructed update max length */
		if (cst)
			{
			if (depth >= ASN1_MAX_STRING_NEST)
				{
				ASN1err(ASN1_F_ASN1_COLLECT,
					ASN1_R_NESTED_ASN1_STRING);
				return 0;
				}
			if (!asn1_collect(buf, &p, plen, ininf, tag, aclass,
						depth + 1))
				return 0;
			}
		else if (plen && !collect_data(buf, &p, plen))
			return 0;
		len -= p - q;
		}
	if (inf)
		{
		ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
		return 0;
		}
	*in = p;
	return 1;
	}