/* v3_crld.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 1999.
 */
/* ====================================================================
 * Copyright (c) 1999-2008 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com). */

#include <stdio.h>
#include <string.h>

#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/conf.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/x509v3.h>


static void *v2i_crld(const X509V3_EXT_METHOD *method,
		      X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval);
static int i2r_crldp(const X509V3_EXT_METHOD *method, void *pcrldp, BIO *out,
		     int indent);

const X509V3_EXT_METHOD v3_crld =
	{
	NID_crl_distribution_points, 0, ASN1_ITEM_ref(CRL_DIST_POINTS),
	0,0,0,0,
	0,0,
	0,
	v2i_crld,
	i2r_crldp,0,
	NULL
	};

const X509V3_EXT_METHOD v3_freshest_crl =
	{
	NID_freshest_crl, 0, ASN1_ITEM_ref(CRL_DIST_POINTS),
	0,0,0,0,
	0,0,
	0,
	v2i_crld,
	i2r_crldp,0,
	NULL
	};

static STACK_OF(GENERAL_NAME) *gnames_from_sectname(X509V3_CTX *ctx, char *sect)
	{
	STACK_OF(CONF_VALUE) *gnsect;
	STACK_OF(GENERAL_NAME) *gens;
	if (*sect == '@')
		gnsect = X509V3_get_section(ctx, sect + 1);
	else
		gnsect = X509V3_parse_list(sect);
	if (!gnsect)
		{
		OPENSSL_PUT_ERROR(X509V3, gnames_from_sectname, X509V3_R_SECTION_NOT_FOUND);
		return NULL;
		}
	gens = v2i_GENERAL_NAMES(NULL, ctx, gnsect);
	if (*sect == '@')
		X509V3_section_free(ctx, gnsect);
	else
		sk_CONF_VALUE_pop_free(gnsect, X509V3_conf_free);
	return gens;
	}

static int set_dist_point_name(DIST_POINT_NAME **pdp, X509V3_CTX *ctx,
							CONF_VALUE *cnf)
	{
	STACK_OF(GENERAL_NAME) *fnm = NULL;
	STACK_OF(X509_NAME_ENTRY) *rnm = NULL;
	if (!strncmp(cnf->name, "fullname", 9))
		{
		fnm = gnames_from_sectname(ctx, cnf->value);
		if (!fnm)
			goto err;
		}
	else if (!strcmp(cnf->name, "relativename"))
		{
		int ret;
		STACK_OF(CONF_VALUE) *dnsect;
		X509_NAME *nm;
		nm = X509_NAME_new();
		if (!nm)
			return -1;
		dnsect = X509V3_get_section(ctx, cnf->value);
		if (!dnsect)
			{
			OPENSSL_PUT_ERROR(X509V3, set_dist_point_name, X509V3_R_SECTION_NOT_FOUND);
			return -1;
			}
		ret = X509V3_NAME_from_section(nm, dnsect, MBSTRING_ASC);
		X509V3_section_free(ctx, dnsect);
		rnm = nm->entries;
		nm->entries = NULL;
		X509_NAME_free(nm);
		if (!ret || sk_X509_NAME_ENTRY_num(rnm) <= 0)
			goto err;
		/* Since its a name fragment can't have more than one
		 * RDNSequence
		 */
		if (sk_X509_NAME_ENTRY_value(rnm,
				sk_X509_NAME_ENTRY_num(rnm) - 1)->set)
			{
			OPENSSL_PUT_ERROR(X509V3, set_dist_point_name, X509V3_R_INVALID_MULTIPLE_RDNS);
			goto err;
			}
		}
	else
		return 0;

	if (*pdp)
		{
		OPENSSL_PUT_ERROR(X509V3, set_dist_point_name, X509V3_R_DISTPOINT_ALREADY_SET);
		goto err;
		}

	*pdp = DIST_POINT_NAME_new();
	if (!*pdp)
		goto err;
	if (fnm)
		{
		(*pdp)->type = 0;
		(*pdp)->name.fullname = fnm;
		}
	else
		{
		(*pdp)->type = 1;
		(*pdp)->name.relativename = rnm;
		}

	return 1;
		
	err:
	if (fnm)
		sk_GENERAL_NAME_pop_free(fnm, GENERAL_NAME_free);
	if (rnm)
		sk_X509_NAME_ENTRY_pop_free(rnm, X509_NAME_ENTRY_free);
	return -1;
	}

static const BIT_STRING_BITNAME reason_flags[] = {
{0, "Unused", "unused"},
{1, "Key Compromise", "keyCompromise"},
{2, "CA Compromise", "CACompromise"},
{3, "Affiliation Changed", "affiliationChanged"},
{4, "Superseded", "superseded"},
{5, "Cessation Of Operation", "cessationOfOperation"},
{6, "Certificate Hold", "certificateHold"},
{7, "Privilege Withdrawn", "privilegeWithdrawn"},
{8, "AA Compromise", "AACompromise"},
{-1, NULL, NULL}
};

static int set_reasons(ASN1_BIT_STRING **preas, char *value)
	{
	STACK_OF(CONF_VALUE) *rsk = NULL;
	const BIT_STRING_BITNAME *pbn;
	const char *bnam;
	size_t i;
	int ret = 0;
	rsk = X509V3_parse_list(value);
	if (!rsk)
		return 0;
	if (*preas)
		return 0;
	for (i = 0; i < sk_CONF_VALUE_num(rsk); i++)
		{
		bnam = sk_CONF_VALUE_value(rsk, i)->name;
		if (!*preas)
			{
			*preas = ASN1_BIT_STRING_new();
			if (!*preas)
				goto err;
			}
		for (pbn = reason_flags; pbn->lname; pbn++)
			{
			if (!strcmp(pbn->sname, bnam))
				{
				if (!ASN1_BIT_STRING_set_bit(*preas,
							pbn->bitnum, 1))
					goto err;
				break;
				}
			}
		if (!pbn->lname)
			goto err;
		}
	ret = 1;

	err:
	sk_CONF_VALUE_pop_free(rsk, X509V3_conf_free);
	return ret;
	}

static int print_reasons(BIO *out, const char *rname,
			ASN1_BIT_STRING *rflags, int indent)
	{
	int first = 1;
	const BIT_STRING_BITNAME *pbn;
	BIO_printf(out, "%*s%s:\n%*s", indent, "", rname, indent + 2, "");
	for (pbn = reason_flags; pbn->lname; pbn++)
		{
		if (ASN1_BIT_STRING_get_bit(rflags, pbn->bitnum))
			{
			if (first)
				first = 0;
			else
				BIO_puts(out, ", ");
			BIO_puts(out, pbn->lname);
			}
		}
	if (first)
		BIO_puts(out, "<EMPTY>\n");
	else
		BIO_puts(out, "\n");
	return 1;
	}

static DIST_POINT *crldp_from_section(X509V3_CTX *ctx,
						STACK_OF(CONF_VALUE) *nval)
	{
	size_t i;
	CONF_VALUE *cnf;
	DIST_POINT *point = NULL;
	point = DIST_POINT_new();
	if (!point)
		goto err;
	for(i = 0; i < sk_CONF_VALUE_num(nval); i++)
		{
		int ret;
		cnf = sk_CONF_VALUE_value(nval, i);
		ret = set_dist_point_name(&point->distpoint, ctx, cnf);
		if (ret > 0)
			continue;
		if (ret < 0)
			goto err;
		if (!strcmp(cnf->name, "reasons"))
			{
			if (!set_reasons(&point->reasons, cnf->value))
				goto err;
			}
		else if (!strcmp(cnf->name, "CRLissuer"))
			{
			point->CRLissuer =
				gnames_from_sectname(ctx, cnf->value);
			if (!point->CRLissuer)
				goto err;
			}
		}

	return point;
			

	err:
	if (point)
		DIST_POINT_free(point);
	return NULL;
	}

static void *v2i_crld(const X509V3_EXT_METHOD *method,
		      X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
	{
	STACK_OF(DIST_POINT) *crld = NULL;
	GENERAL_NAMES *gens = NULL;
	GENERAL_NAME *gen = NULL;
	CONF_VALUE *cnf;
	size_t i;
	if(!(crld = sk_DIST_POINT_new_null())) goto merr;
	for(i = 0; i < sk_CONF_VALUE_num(nval); i++) {
		DIST_POINT *point;
		cnf = sk_CONF_VALUE_value(nval, i);
		if (!cnf->value)
			{
			STACK_OF(CONF_VALUE) *dpsect;
			dpsect = X509V3_get_section(ctx, cnf->name);
			if (!dpsect)
				goto err;
			point = crldp_from_section(ctx, dpsect);
			X509V3_section_free(ctx, dpsect);
			if (!point)
				goto err;
			if(!sk_DIST_POINT_push(crld, point))
				{
				DIST_POINT_free(point);
				goto merr;
				}
			}
		else
			{
			if(!(gen = v2i_GENERAL_NAME(method, ctx, cnf)))
				goto err; 
			if(!(gens = GENERAL_NAMES_new()))
				goto merr;
			if(!sk_GENERAL_NAME_push(gens, gen))
				goto merr;
			gen = NULL;
			if(!(point = DIST_POINT_new()))
				goto merr;
			if(!sk_DIST_POINT_push(crld, point))
				{
				DIST_POINT_free(point);
				goto merr;
				}
			if(!(point->distpoint = DIST_POINT_NAME_new()))
				goto merr;
			point->distpoint->name.fullname = gens;
			point->distpoint->type = 0;
			gens = NULL;
			}
	}
	return crld;

	merr:
	OPENSSL_PUT_ERROR(X509V3, v2i_crld, ERR_R_MALLOC_FAILURE);
	err:
	GENERAL_NAME_free(gen);
	GENERAL_NAMES_free(gens);
	sk_DIST_POINT_pop_free(crld, DIST_POINT_free);
	return NULL;
}

IMPLEMENT_ASN1_SET_OF(DIST_POINT)

static int dpn_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
								void *exarg)
	{
	DIST_POINT_NAME *dpn = (DIST_POINT_NAME *)*pval;

	switch(operation)
		{
		case ASN1_OP_NEW_POST:
		dpn->dpname = NULL;
		break;

		case ASN1_OP_FREE_POST:
		if (dpn->dpname)
			X509_NAME_free(dpn->dpname);
		break;
		}
	return 1;
	}


ASN1_CHOICE_cb(DIST_POINT_NAME, dpn_cb) = {
	ASN1_IMP_SEQUENCE_OF(DIST_POINT_NAME, name.fullname, GENERAL_NAME, 0),
	ASN1_IMP_SET_OF(DIST_POINT_NAME, name.relativename, X509_NAME_ENTRY, 1)
} ASN1_CHOICE_END_cb(DIST_POINT_NAME, DIST_POINT_NAME, type)


IMPLEMENT_ASN1_FUNCTIONS(DIST_POINT_NAME)

ASN1_SEQUENCE(DIST_POINT) = {
	ASN1_EXP_OPT(DIST_POINT, distpoint, DIST_POINT_NAME, 0),
	ASN1_IMP_OPT(DIST_POINT, reasons, ASN1_BIT_STRING, 1),
	ASN1_IMP_SEQUENCE_OF_OPT(DIST_POINT, CRLissuer, GENERAL_NAME, 2)
} ASN1_SEQUENCE_END(DIST_POINT)

IMPLEMENT_ASN1_FUNCTIONS(DIST_POINT)

ASN1_ITEM_TEMPLATE(CRL_DIST_POINTS) = 
	ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, CRLDistributionPoints, DIST_POINT)
ASN1_ITEM_TEMPLATE_END(CRL_DIST_POINTS)

IMPLEMENT_ASN1_FUNCTIONS(CRL_DIST_POINTS)

ASN1_SEQUENCE(ISSUING_DIST_POINT) = {
	ASN1_EXP_OPT(ISSUING_DIST_POINT, distpoint, DIST_POINT_NAME, 0),
	ASN1_IMP_OPT(ISSUING_DIST_POINT, onlyuser, ASN1_FBOOLEAN, 1),
	ASN1_IMP_OPT(ISSUING_DIST_POINT, onlyCA, ASN1_FBOOLEAN, 2),
	ASN1_IMP_OPT(ISSUING_DIST_POINT, onlysomereasons, ASN1_BIT_STRING, 3),
	ASN1_IMP_OPT(ISSUING_DIST_POINT, indirectCRL, ASN1_FBOOLEAN, 4),
	ASN1_IMP_OPT(ISSUING_DIST_POINT, onlyattr, ASN1_FBOOLEAN, 5)
} ASN1_SEQUENCE_END(ISSUING_DIST_POINT)

IMPLEMENT_ASN1_FUNCTIONS(ISSUING_DIST_POINT)

static int i2r_idp(const X509V3_EXT_METHOD *method, void *pidp, BIO *out,
		   int indent);
static void *v2i_idp(const X509V3_EXT_METHOD *method, X509V3_CTX *ctx,
		     STACK_OF(CONF_VALUE) *nval);

const X509V3_EXT_METHOD v3_idp =
	{
	NID_issuing_distribution_point, X509V3_EXT_MULTILINE,
	ASN1_ITEM_ref(ISSUING_DIST_POINT),
	0,0,0,0,
	0,0,
	0,
	v2i_idp,
	i2r_idp,0,
	NULL
	};

static void *v2i_idp(const X509V3_EXT_METHOD *method, X509V3_CTX *ctx,
		     STACK_OF(CONF_VALUE) *nval)
	{
	ISSUING_DIST_POINT *idp = NULL;
	CONF_VALUE *cnf;
	char *name, *val;
	size_t i;
	int ret;
	idp = ISSUING_DIST_POINT_new();
	if (!idp)
		goto merr;
	for(i = 0; i < sk_CONF_VALUE_num(nval); i++)
		{
		cnf = sk_CONF_VALUE_value(nval, i);
		name = cnf->name;
		val = cnf->value;
		ret = set_dist_point_name(&idp->distpoint, ctx, cnf);
		if (ret > 0)
			continue;
		if (ret < 0)
			goto err;
		if (!strcmp(name, "onlyuser"))
			{
			if (!X509V3_get_value_bool(cnf, &idp->onlyuser))
				goto err;
			}
		else if (!strcmp(name, "onlyCA"))
			{
			if (!X509V3_get_value_bool(cnf, &idp->onlyCA))
				goto err;
			}
		else if (!strcmp(name, "onlyAA"))
			{
			if (!X509V3_get_value_bool(cnf, &idp->onlyattr))
				goto err;
			}
		else if (!strcmp(name, "indirectCRL"))
			{
			if (!X509V3_get_value_bool(cnf, &idp->indirectCRL))
				goto err;
			}
		else if (!strcmp(name, "onlysomereasons"))
			{
			if (!set_reasons(&idp->onlysomereasons, val))
				goto err;
			}
		else
			{
                        OPENSSL_PUT_ERROR(X509V3, v2i_idp, X509V3_R_INVALID_NAME);
                        X509V3_conf_err(cnf);
                        goto err;
			}
		}
	return idp;

	merr:
	OPENSSL_PUT_ERROR(X509V3, v2i_idp, ERR_R_MALLOC_FAILURE);
	err:
	ISSUING_DIST_POINT_free(idp);
	return NULL;
	}

static int print_gens(BIO *out, STACK_OF(GENERAL_NAME) *gens, int indent)
	{
	size_t i;
	for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
		{
		BIO_printf(out, "%*s", indent + 2, "");
		GENERAL_NAME_print(out, sk_GENERAL_NAME_value(gens, i));
		BIO_puts(out, "\n");
		}
	return 1;
	}

static int print_distpoint(BIO *out, DIST_POINT_NAME *dpn, int indent)
	{
	if (dpn->type == 0)
		{
		BIO_printf(out, "%*sFull Name:\n", indent, "");
		print_gens(out, dpn->name.fullname, indent);
		}
	else
		{
		X509_NAME ntmp;
		ntmp.entries = dpn->name.relativename;
		BIO_printf(out, "%*sRelative Name:\n%*s",
						indent, "", indent + 2, "");
		X509_NAME_print_ex(out, &ntmp, 0, XN_FLAG_ONELINE);
		BIO_puts(out, "\n");
		}
	return 1;
	}

static int i2r_idp(const X509V3_EXT_METHOD *method, void *pidp, BIO *out,
		   int indent)
	{
	ISSUING_DIST_POINT *idp = pidp;
	if (idp->distpoint)
		print_distpoint(out, idp->distpoint, indent);
	if (idp->onlyuser > 0)
		BIO_printf(out, "%*sOnly User Certificates\n", indent, "");
	if (idp->onlyCA > 0)
		BIO_printf(out, "%*sOnly CA Certificates\n", indent, "");
	if (idp->indirectCRL > 0)
		BIO_printf(out, "%*sIndirect CRL\n", indent, "");
	if (idp->onlysomereasons)
		print_reasons(out, "Only Some Reasons", 
				idp->onlysomereasons, indent);
	if (idp->onlyattr > 0)
		BIO_printf(out, "%*sOnly Attribute Certificates\n", indent, "");
	if (!idp->distpoint && (idp->onlyuser <= 0) && (idp->onlyCA <= 0)
		&& (idp->indirectCRL <= 0) && !idp->onlysomereasons
		&& (idp->onlyattr <= 0))
		BIO_printf(out, "%*s<EMPTY>\n", indent, "");
		
	return 1;
	}

static int i2r_crldp(const X509V3_EXT_METHOD *method, void *pcrldp, BIO *out,
		     int indent)
	{
	STACK_OF(DIST_POINT) *crld = pcrldp;
	DIST_POINT *point;
	size_t i;
	for(i = 0; i < sk_DIST_POINT_num(crld); i++)
		{
		BIO_puts(out, "\n");
		point = sk_DIST_POINT_value(crld, i);
		if(point->distpoint)
			print_distpoint(out, point->distpoint, indent);
		if(point->reasons) 
			print_reasons(out, "Reasons", point->reasons,
								indent);
		if(point->CRLissuer)
			{
			BIO_printf(out, "%*sCRL Issuer:\n", indent, "");
			print_gens(out, point->CRLissuer, indent);
			}
		}
	return 1;
	}

int DIST_POINT_set_dpname(DIST_POINT_NAME *dpn, X509_NAME *iname)
	{
	size_t i;
	STACK_OF(X509_NAME_ENTRY) *frag;
	X509_NAME_ENTRY *ne;
	if (!dpn || (dpn->type != 1))
		return 1;
	frag = dpn->name.relativename;
	dpn->dpname = X509_NAME_dup(iname);
	if (!dpn->dpname)
		return 0;
	for (i = 0; i < sk_X509_NAME_ENTRY_num(frag); i++)
		{
		ne = sk_X509_NAME_ENTRY_value(frag, i);
		if (!X509_NAME_add_entry(dpn->dpname, ne, -1, i ? 0 : 1))
			{
			X509_NAME_free(dpn->dpname);
			dpn->dpname = NULL;
			return 0;
			}
		}
	/* generate cached encoding of name */
	if (i2d_X509_NAME(dpn->dpname, NULL) < 0)
		{
		X509_NAME_free(dpn->dpname);
		dpn->dpname = NULL;
		return 0;
		}
	return 1;
	}