asn1_gen.c

开源的ssl算法openssl,版本0.9.8H

/* asn1_gen.c */
/* Written by Dr Stephen N Henson ([e-mail]) for the OpenSSL
 * project 2002.
 */
/* ====================================================================
 * Copyright (c) 2002 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
 *    [e-mail].
 *
 * 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * ([e-mail]).  This product includes software written by Tim
 * Hudson ([e-mail]).
 *
 */

#include "cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/x509v3.h>

#define ASN1_GEN_FLAG		0x10000
#define ASN1_GEN_FLAG_IMP	(ASN1_GEN_FLAG|1)
#define ASN1_GEN_FLAG_EXP	(ASN1_GEN_FLAG|2)
#define ASN1_GEN_FLAG_TAG	(ASN1_GEN_FLAG|3)
#define ASN1_GEN_FLAG_BITWRAP	(ASN1_GEN_FLAG|4)
#define ASN1_GEN_FLAG_OCTWRAP	(ASN1_GEN_FLAG|5)
#define ASN1_GEN_FLAG_SEQWRAP	(ASN1_GEN_FLAG|6)
#define ASN1_GEN_FLAG_SETWRAP	(ASN1_GEN_FLAG|7)
#define ASN1_GEN_FLAG_FORMAT	(ASN1_GEN_FLAG|8)

#define ASN1_GEN_STR(str,val)	{str, sizeof(str) - 1, val}

#define ASN1_FLAG_EXP_MAX	20

/* Input formats */

/* ASCII: default */
#define ASN1_GEN_FORMAT_ASCII	1
/* UTF8 */
#define ASN1_GEN_FORMAT_UTF8	2
/* Hex */
#define ASN1_GEN_FORMAT_HEX	3
/* List of bits */
#define ASN1_GEN_FORMAT_BITLIST	4


struct tag_name_st
	{
	const char *strnam;
	int len;
	int tag;
	};

typedef struct
	{
	int exp_tag;
	int exp_class;
	int exp_constructed;
	int exp_pad;
	long exp_len;
	} tag_exp_type;

typedef struct
	{
	int imp_tag;
	int imp_class;
	int utype;
	int format;
	const char *str;
	tag_exp_type exp_list[ASN1_FLAG_EXP_MAX];
	int exp_count;
	} tag_exp_arg;

static int bitstr_cb(const char *elem, int len, void *bitstr);
static int asn1_cb(const char *elem, int len, void *bitstr);
static int append_exp(tag_exp_arg *arg, int exp_tag, int exp_class, int exp_constructed, int exp_pad, int imp_ok);
static int parse_tagging(const char *vstart, int vlen, int *ptag, int *pclass);
static ASN1_TYPE *asn1_multi(int utype, const char *section, X509V3_CTX *cnf);
static ASN1_TYPE *asn1_str2type(const char *str, int format, int utype);
static int asn1_str2tag(const char *tagstr, int len);

ASN1_TYPE *ASN1_generate_nconf(char *str, CONF *nconf)
	{
	X509V3_CTX cnf;

	if (!nconf)
		return ASN1_generate_v3(str, NULL);

	X509V3_set_nconf(&cnf, nconf);
	return ASN1_generate_v3(str, &cnf);
	}

ASN1_TYPE *ASN1_generate_v3(char *str, X509V3_CTX *cnf)
	{
	ASN1_TYPE *ret;
	tag_exp_arg asn1_tags;
	tag_exp_type *etmp;

	int i, len;

	unsigned char *orig_der = NULL, *new_der = NULL;
	const unsigned char *cpy_start;
	unsigned char *p;
	const unsigned char *cp;
	int cpy_len;
	long hdr_len;
	int hdr_constructed = 0, hdr_tag, hdr_class;
	int r;

	asn1_tags.imp_tag = -1;
	asn1_tags.imp_class = -1;
	asn1_tags.format = ASN1_GEN_FORMAT_ASCII;
	asn1_tags.exp_count = 0;
	if (CONF_parse_list(str, ',', 1, asn1_cb, &asn1_tags) != 0)
		return NULL;

	if ((asn1_tags.utype == V_ASN1_SEQUENCE) || (asn1_tags.utype == V_ASN1_SET))
		{
		if (!cnf)
			{
			ASN1err(ASN1_F_ASN1_GENERATE_V3, ASN1_R_SEQUENCE_OR_SET_NEEDS_CONFIG);
			return NULL;
			}
		ret = asn1_multi(asn1_tags.utype, asn1_tags.str, cnf);
		}
	else
		ret = asn1_str2type(asn1_tags.str, asn1_tags.format, asn1_tags.utype);

	if (!ret)
		return NULL;

	/* If no tagging return base type */
	if ((asn1_tags.imp_tag == -1) && (asn1_tags.exp_count == 0))
		return ret;

	/* Generate the encoding */
	cpy_len = i2d_ASN1_TYPE(ret, &orig_der);
	ASN1_TYPE_free(ret);
	ret = NULL;
	/* Set point to start copying for modified encoding */
	cpy_start = orig_der;

	/* Do we need IMPLICIT tagging? */
	if (asn1_tags.imp_tag != -1)
		{
		/* If IMPLICIT we will replace the underlying tag */
		/* Skip existing tag+len */
		r = ASN1_get_object(&cpy_start, &hdr_len, &hdr_tag, &hdr_class, cpy_len);
		if (r & 0x80)
			goto err;
		/* Update copy length */
		cpy_len -= cpy_start - orig_der;
		/* For IMPLICIT tagging the length should match the
		 * original length and constructed flag should be
		 * consistent.
		 */
		if (r & 0x1)
			{
			/* Indefinite length constructed */
			hdr_constructed = 2;
			hdr_len = 0;
			}
		else
			/* Just retain constructed flag */
			hdr_constructed = r & V_ASN1_CONSTRUCTED;
		/* Work out new length with IMPLICIT tag: ignore constructed
		 * because it will mess up if indefinite length
		 */
		len = ASN1_object_size(0, hdr_len, asn1_tags.imp_tag);
		}
	else
		len = cpy_len;

	/* Work out length in any EXPLICIT, starting from end */

	for(i = 0, etmp = asn1_tags.exp_list + asn1_tags.exp_count - 1; i < asn1_tags.exp_count; i++, etmp--)
		{
		/* Content length: number of content octets + any padding */
		len += etmp->exp_pad;
		etmp->exp_len = len;
		/* Total object length: length including new header */
		len = ASN1_object_size(0, len, etmp->exp_tag);
		}

	/* Allocate buffer for new encoding */

	new_der = OPENSSL_malloc(len);

	/* Generate tagged encoding */

	p = new_der;

	/* Output explicit tags first */

	for (i = 0, etmp = asn1_tags.exp_list; i < asn1_tags.exp_count; i++, etmp++)
		{
		ASN1_put_object(&p, etmp->exp_constructed, etmp->exp_len,
					etmp->exp_tag, etmp->exp_class);
		if (etmp->exp_pad)
			*p++ = 0;
		}

	/* If IMPLICIT, output tag */

	if (asn1_tags.imp_tag != -1)
		ASN1_put_object(&p, hdr_constructed, hdr_len,
					asn1_tags.imp_tag, asn1_tags.imp_class);

	/* Copy across original encoding */
	memcpy(p, cpy_start, cpy_len);

	cp = new_der;

	/* Obtain new ASN1_TYPE structure */
	ret = d2i_ASN1_TYPE(NULL, &cp, len);

	err:
	if (orig_der)
		OPENSSL_free(orig_der);
	if (new_der)
		OPENSSL_free(new_der);

	return ret;

	}

static int asn1_cb(const char *elem, int len, void *bitstr)
	{
	tag_exp_arg *arg = bitstr;
	int i;
	int utype;
	int vlen = 0;
	const char *p, *vstart = NULL;

	int tmp_tag, tmp_class;

	for(i = 0, p = elem; i < len; p++, i++)
		{
		/* Look for the ':' in name value pairs */
		if (*p == ':')
			{
			vstart = p + 1;
			vlen = len - (vstart - elem);
			len = p - elem;
			break;
			}
		}

	utype = asn1_str2tag(elem, len);

	if (utype == -1)
		{
		ASN1err(ASN1_F_ASN1_CB, ASN1_R_UNKNOWN_TAG);
		ERR_add_error_data(2, "tag=", elem);
		return -1;
		}

	/* If this is not a modifier mark end of string and exit */
	if (!(utype & ASN1_GEN_FLAG))
		{
		arg->utype = utype;
		arg->str = vstart;
		/* If no value and not end of string, error */
		if (!vstart && elem[len])
			{
			ASN1err(ASN1_F_ASN1_CB, ASN1_R_MISSING_VALUE);
			return -1;
			}
		return 0;
		}

	switch(utype)
		{

		case ASN1_GEN_FLAG_IMP:
		/* Check for illegal multiple IMPLICIT tagging */
		if (arg->imp_tag != -1)
			{
			ASN1err(ASN1_F_ASN1_CB, ASN1_R_ILLEGAL_NESTED_TAGGING);
			return -1;
			}
		if (!parse_tagging(vstart, vlen, &arg->imp_tag, &arg->imp_class))
			return -1;
		break;

		case ASN1_GEN_FLAG_EXP:

		if (!parse_tagging(vstart, vlen, &tmp_tag, &tmp_class))
			return -1;
		if (!append_exp(arg, tmp_tag, tmp_class, 1, 0, 0))
			return -1;
		break;

		case ASN1_GEN_FLAG_SEQWRAP:
		if (!append_exp(arg, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL, 1, 0, 1))
			return -1;
		break;

		case ASN1_GEN_FLAG_SETWRAP:
		if (!append_exp(arg, V_ASN1_SET, V_ASN1_UNIVERSAL, 1, 0, 1))
			return -1;
		break;

		case ASN1_GEN_FLAG_BITWRAP:
		if (!append_exp(arg, V_ASN1_BIT_STRING, V_ASN1_UNIVERSAL, 0, 1, 1))
			return -1;
		break;

		case ASN1_GEN_FLAG_OCTWRAP:
		if (!append_exp(arg, V_ASN1_OCTET_STRING, V_ASN1_UNIVERSAL, 0, 0, 1))
			return -1;
		break;

		case ASN1_GEN_FLAG_FORMAT:
		if (!strncmp(vstart, "ASCII", 5))
			arg->format = ASN1_GEN_FORMAT_ASCII;
		else if (!strncmp(vstart, "UTF8", 4))
			arg->format = ASN1_GEN_FORMAT_UTF8;
		else if (!strncmp(vstart, "HEX", 3))
			arg->format = ASN1_GEN_FORMAT_HEX;
		else if (!strncmp(vstart, "BITLIST", 3))
			arg->format = ASN1_GEN_FORMAT_BITLIST;
		else
			{
			ASN1err(ASN1_F_ASN1_CB, ASN1_R_UNKOWN_FORMAT);
			return -1;
			}
		break;

		}

	return 1;

	}

static int parse_tagging(const char *vstart, int vlen, int *ptag, int *pclass)
	{
	char erch[2];
	long tag_num;
	char *eptr;
	if (!vstart)
		return 0;
	tag_num = strtoul(vstart, &eptr, 10);
	/* Check we haven't gone past max length: should be impossible */
	if (eptr && *eptr && (eptr > vstart + vlen))
		return 0;
	if (tag_num < 0)
		{
		ASN1err(ASN1_F_PARSE_TAGGING, ASN1_R_INVALID_NUMBER);
		return 0;
		}
	*ptag = tag_num;
	/* If we have non numeric characters, parse them */
	if (eptr)
		vlen -= eptr - vstart;
	else 
		vlen = 0;
	if (vlen)
		{
		switch (*eptr)
			{

			case 'U':
			*pclass = V_ASN1_UNIVERSAL;
			break;

			case 'A':
			*pclass = V_ASN1_APPLICATION;
			break;

			case 'P':
			*pclass = V_ASN1_PRIVATE;
			break;

			case 'C':
			*pclass = V_ASN1_CONTEXT_SPECIFIC;
			break;

			default:
			erch[0] = *eptr;
			erch[1] = 0;
			ASN1err(ASN1_F_PARSE_TAGGING, ASN1_R_INVALID_MODIFIER);
			ERR_add_error_data(2, "Char=", erch);