[efi-boot-shim.git] / Cryptlib / OpenSSL / crypto / x509v3 / v3_ncons.c

/* v3_ncons.c */
/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 2003 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 "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/conf.h>
#include <openssl/x509v3.h>

static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
                                  X509V3_CTX *ctx,
                                  STACK_OF(CONF_VALUE) *nval);
static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
                                BIO *bp, int ind);
static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
                                   STACK_OF(GENERAL_SUBTREE) *trees, BIO *bp,
                                   int ind, char *name);
static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip);

static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc);
static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen);
static int nc_dn(X509_NAME *sub, X509_NAME *nm);
static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns);
static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml);
static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base);

const X509V3_EXT_METHOD v3_name_constraints = {
    NID_name_constraints, 0,
    ASN1_ITEM_ref(NAME_CONSTRAINTS),
    0, 0, 0, 0,
    0, 0,
    0, v2i_NAME_CONSTRAINTS,
    i2r_NAME_CONSTRAINTS, 0,
    NULL
};

ASN1_SEQUENCE(GENERAL_SUBTREE) = {
        ASN1_SIMPLE(GENERAL_SUBTREE, base, GENERAL_NAME),
        ASN1_IMP_OPT(GENERAL_SUBTREE, minimum, ASN1_INTEGER, 0),
        ASN1_IMP_OPT(GENERAL_SUBTREE, maximum, ASN1_INTEGER, 1)
} ASN1_SEQUENCE_END(GENERAL_SUBTREE)

ASN1_SEQUENCE(NAME_CONSTRAINTS) = {
        ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, permittedSubtrees,
                                                        GENERAL_SUBTREE, 0),
        ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, excludedSubtrees,
                                                        GENERAL_SUBTREE, 1),
} ASN1_SEQUENCE_END(NAME_CONSTRAINTS)


IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS)

static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
                                  X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
{
    int i;
    CONF_VALUE tval, *val;
    STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
    NAME_CONSTRAINTS *ncons = NULL;
    GENERAL_SUBTREE *sub = NULL;
    ncons = NAME_CONSTRAINTS_new();
    if (!ncons)
        goto memerr;
    for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
        val = sk_CONF_VALUE_value(nval, i);
        if (!strncmp(val->name, "permitted", 9) && val->name[9]) {
            ptree = &ncons->permittedSubtrees;
            tval.name = val->name + 10;
        } else if (!strncmp(val->name, "excluded", 8) && val->name[8]) {
            ptree = &ncons->excludedSubtrees;
            tval.name = val->name + 9;
        } else {
            X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, X509V3_R_INVALID_SYNTAX);
            goto err;
        }
        tval.value = val->value;
        sub = GENERAL_SUBTREE_new();
        if (sub == NULL)
            goto memerr;
        if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
            goto err;
        if (!*ptree)
            *ptree = sk_GENERAL_SUBTREE_new_null();
        if (!*ptree || !sk_GENERAL_SUBTREE_push(*ptree, sub))
            goto memerr;
        sub = NULL;
    }

    return ncons;

 memerr:
    X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
 err:
    if (ncons)
        NAME_CONSTRAINTS_free(ncons);
    if (sub)
        GENERAL_SUBTREE_free(sub);

    return NULL;
}

static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
                                BIO *bp, int ind)
{
    NAME_CONSTRAINTS *ncons = a;
    do_i2r_name_constraints(method, ncons->permittedSubtrees,
                            bp, ind, "Permitted");
    do_i2r_name_constraints(method, ncons->excludedSubtrees,
                            bp, ind, "Excluded");
    return 1;
}

static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
                                   STACK_OF(GENERAL_SUBTREE) *trees,
                                   BIO *bp, int ind, char *name)
{
    GENERAL_SUBTREE *tree;
    int i;
    if (sk_GENERAL_SUBTREE_num(trees) > 0)
        BIO_printf(bp, "%*s%s:\n", ind, "", name);
    for (i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++) {
        tree = sk_GENERAL_SUBTREE_value(trees, i);
        BIO_printf(bp, "%*s", ind + 2, "");
        if (tree->base->type == GEN_IPADD)
            print_nc_ipadd(bp, tree->base->d.ip);
        else
            GENERAL_NAME_print(bp, tree->base);
        BIO_puts(bp, "\n");
    }
    return 1;
}

static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
{
    int i, len;
    unsigned char *p;
    p = ip->data;
    len = ip->length;
    BIO_puts(bp, "IP:");
    if (len == 8) {
        BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
                   p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
    } else if (len == 32) {
        for (i = 0; i < 16; i++) {
            BIO_printf(bp, "%X", p[0] << 8 | p[1]);
            p += 2;
            if (i == 7)
                BIO_puts(bp, "/");
            else if (i != 15)
                BIO_puts(bp, ":");
        }
    } else
        BIO_printf(bp, "IP Address:<invalid>");
    return 1;
}

/*-
 * Check a certificate conforms to a specified set of constraints.
 * Return values:
 *  X509_V_OK: All constraints obeyed.
 *  X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
 *  X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
 *  X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
 *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE:  Unsupported constraint type.
 *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
 *  X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
 */

int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
{
    int r, i;
    X509_NAME *nm;

    nm = X509_get_subject_name(x);

    if (X509_NAME_entry_count(nm) > 0) {
        GENERAL_NAME gntmp;
        gntmp.type = GEN_DIRNAME;
        gntmp.d.directoryName = nm;

        r = nc_match(&gntmp, nc);

        if (r != X509_V_OK)
            return r;

        gntmp.type = GEN_EMAIL;

        /* Process any email address attributes in subject name */

        for (i = -1;;) {
            X509_NAME_ENTRY *ne;
            i = X509_NAME_get_index_by_NID(nm, NID_pkcs9_emailAddress, i);
            if (i == -1)
                break;
            ne = X509_NAME_get_entry(nm, i);
            gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
            if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
                return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;

            r = nc_match(&gntmp, nc);

            if (r != X509_V_OK)
                return r;
        }

    }

    for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++) {
        GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
        r = nc_match(gen, nc);
        if (r != X509_V_OK)
            return r;
    }

    return X509_V_OK;

}

static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
{
    GENERAL_SUBTREE *sub;
    int i, r, match = 0;

    /*
     * Permitted subtrees: if any subtrees exist of matching the type at
     * least one subtree must match.
     */

    for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++) {
        sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
        if (gen->type != sub->base->type)
            continue;
        if (sub->minimum || sub->maximum)
            return X509_V_ERR_SUBTREE_MINMAX;
        /* If we already have a match don't bother trying any more */
        if (match == 2)
            continue;
        if (match == 0)
            match = 1;
        r = nc_match_single(gen, sub->base);
        if (r == X509_V_OK)
            match = 2;
        else if (r != X509_V_ERR_PERMITTED_VIOLATION)
            return r;
    }

    if (match == 1)
        return X509_V_ERR_PERMITTED_VIOLATION;

    /* Excluded subtrees: must not match any of these */

    for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++) {
        sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
        if (gen->type != sub->base->type)
            continue;
        if (sub->minimum || sub->maximum)
            return X509_V_ERR_SUBTREE_MINMAX;

        r = nc_match_single(gen, sub->base);
        if (r == X509_V_OK)
            return X509_V_ERR_EXCLUDED_VIOLATION;
        else if (r != X509_V_ERR_PERMITTED_VIOLATION)
            return r;

    }

    return X509_V_OK;

}

static int nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
{
    switch (base->type) {
    case GEN_DIRNAME:
        return nc_dn(gen->d.directoryName, base->d.directoryName);

    case GEN_DNS:
        return nc_dns(gen->d.dNSName, base->d.dNSName);

    case GEN_EMAIL:
        return nc_email(gen->d.rfc822Name, base->d.rfc822Name);

    case GEN_URI:
        return nc_uri(gen->d.uniformResourceIdentifier,
                      base->d.uniformResourceIdentifier);

    default:
        return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
    }

}

/*
 * directoryName name constraint matching. The canonical encoding of
 * X509_NAME makes this comparison easy. It is matched if the subtree is a
 * subset of the name.
 */

static int nc_dn(X509_NAME *nm, X509_NAME *base)
{
    /* Ensure canonical encodings are up to date.  */
    if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
        return X509_V_ERR_OUT_OF_MEM;
    if (base->modified && i2d_X509_NAME(base, NULL) < 0)
        return X509_V_ERR_OUT_OF_MEM;
    if (base->canon_enclen > nm->canon_enclen)
        return X509_V_ERR_PERMITTED_VIOLATION;
    if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
        return X509_V_ERR_PERMITTED_VIOLATION;
    return X509_V_OK;
}

static int nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
{
    char *baseptr = (char *)base->data;
    char *dnsptr = (char *)dns->data;
    /* Empty matches everything */
    if (!*baseptr)
        return X509_V_OK;
    /*
     * Otherwise can add zero or more components on the left so compare RHS
     * and if dns is longer and expect '.' as preceding character.
     */
    if (dns->length > base->length) {
        dnsptr += dns->length - base->length;
        if (*baseptr != '.' && dnsptr[-1] != '.')
            return X509_V_ERR_PERMITTED_VIOLATION;
    }

    if (strcasecmp(baseptr, dnsptr))
        return X509_V_ERR_PERMITTED_VIOLATION;

    return X509_V_OK;

}

static int nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
{
    const char *baseptr = (char *)base->data;
    const char *emlptr = (char *)eml->data;

    const char *baseat = strchr(baseptr, '@');
    const char *emlat = strchr(emlptr, '@');
    if (!emlat)
        return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
    /* Special case: inital '.' is RHS match */
    if (!baseat && (*baseptr == '.')) {
        if (eml->length > base->length) {
            emlptr += eml->length - base->length;
            if (!strcasecmp(baseptr, emlptr))
                return X509_V_OK;
        }
        return X509_V_ERR_PERMITTED_VIOLATION;
    }

    /* If we have anything before '@' match local part */

    if (baseat) {
        if (baseat != baseptr) {
            if ((baseat - baseptr) != (emlat - emlptr))
                return X509_V_ERR_PERMITTED_VIOLATION;
            /* Case sensitive match of local part */
            if (strncmp(baseptr, emlptr, emlat - emlptr))
                return X509_V_ERR_PERMITTED_VIOLATION;
        }
        /* Position base after '@' */
        baseptr = baseat + 1;
    }
    emlptr = emlat + 1;
    /* Just have hostname left to match: case insensitive */
    if (strcasecmp(baseptr, emlptr))
        return X509_V_ERR_PERMITTED_VIOLATION;

    return X509_V_OK;

}

static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
{
    const char *baseptr = (char *)base->data;
    const char *hostptr = (char *)uri->data;
    const char *p = strchr(hostptr, ':');
    int hostlen;
    /* Check for foo:// and skip past it */
    if (!p || (p[1] != '/') || (p[2] != '/'))
        return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
    hostptr = p + 3;

    /* Determine length of hostname part of URI */

    /* Look for a port indicator as end of hostname first */

    p = strchr(hostptr, ':');
    /* Otherwise look for trailing slash */
    if (!p)
        p = strchr(hostptr, '/');

    if (!p)
        hostlen = strlen(hostptr);
    else
        hostlen = p - hostptr;

    if (hostlen == 0)
        return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;

    /* Special case: inital '.' is RHS match */
    if (*baseptr == '.') {
        if (hostlen > base->length) {
            p = hostptr + hostlen - base->length;
            if (!strncasecmp(p, baseptr, base->length))
                return X509_V_OK;
        }
        return X509_V_ERR_PERMITTED_VIOLATION;
    }

    if ((base->length != (int)hostlen)
        || strncasecmp(hostptr, baseptr, hostlen))
        return X509_V_ERR_PERMITTED_VIOLATION;

    return X509_V_OK;

}
Commit	Line	Data
031e5cce	1	/* v3_ncons.c */
d3819813	2	/*
031e5cce SM	3	* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
	4	* project.
	5	*/
	6	/* ====================================================================
	7	* Copyright (c) 2003 The OpenSSL Project. All rights reserved.
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	*
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	*
	16	* 2. Redistributions in binary form must reproduce the above copyright
	17	* notice, this list of conditions and the following disclaimer in
	18	* the documentation and/or other materials provided with the
	19	* distribution.
	20	*
	21	* 3. All advertising materials mentioning features or use of this
	22	* software must display the following acknowledgment:
	23	* "This product includes software developed by the OpenSSL Project
	24	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	25	*
	26	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	27	* endorse or promote products derived from this software without
	28	* prior written permission. For written permission, please contact
	29	* licensing@OpenSSL.org.
	30	*
	31	* 5. Products derived from this software may not be called "OpenSSL"
	32	* nor may "OpenSSL" appear in their names without prior written
	33	* permission of the OpenSSL Project.
	34	*
	35	* 6. Redistributions of any form whatsoever must retain the following
	36	* acknowledgment:
	37	* "This product includes software developed by the OpenSSL Project
	38	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	39	*
	40	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	41	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	42	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	43	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	44	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	45	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	46	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	47	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	49	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	50	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	51	* OF THE POSSIBILITY OF SUCH DAMAGE.
	52	* ====================================================================
	53	*
	54	* This product includes cryptographic software written by Eric Young
	55	* (eay@cryptsoft.com). This product includes software written by Tim
	56	* Hudson (tjh@cryptsoft.com).
3e575651 SL	57	*
	58	*/
	59
3e575651	60	#include <stdio.h>
031e5cce	61	#include "cryptlib.h"
3e575651 SL	62	#include <openssl/asn1t.h>
	63	#include <openssl/conf.h>
	64	#include <openssl/x509v3.h>
	65
d3819813 MTL	66	static void v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD method,
	67	X509V3_CTX *ctx,
	68	STACK_OF(CONF_VALUE) *nval);
	69	static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD method, void a,
	70	BIO *bp, int ind);
	71	static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
	72	STACK_OF(GENERAL_SUBTREE) trees, BIO bp,
031e5cce	73	int ind, char *name);
3e575651 SL	74	static int print_nc_ipadd(BIO bp, ASN1_OCTET_STRING ip);
3e575651 SL	75
d3819813 MTL	76	static int nc_match(GENERAL_NAME gen, NAME_CONSTRAINTS nc);
	77	static int nc_match_single(GENERAL_NAME sub, GENERAL_NAME gen);
	78	static int nc_dn(X509_NAME sub, X509_NAME nm);
	79	static int nc_dns(ASN1_IA5STRING sub, ASN1_IA5STRING dns);
	80	static int nc_email(ASN1_IA5STRING sub, ASN1_IA5STRING eml);
	81	static int nc_uri(ASN1_IA5STRING uri, ASN1_IA5STRING base);
	82
3e575651	83	const X509V3_EXT_METHOD v3_name_constraints = {
d3819813 MTL	84	NID_name_constraints, 0,
	85	ASN1_ITEM_ref(NAME_CONSTRAINTS),
	86	0, 0, 0, 0,
	87	0, 0,
	88	0, v2i_NAME_CONSTRAINTS,
	89	i2r_NAME_CONSTRAINTS, 0,
	90	NULL
3e575651 SL	91	};
	92
	93	ASN1_SEQUENCE(GENERAL_SUBTREE) = {
d3819813 MTL	94	ASN1_SIMPLE(GENERAL_SUBTREE, base, GENERAL_NAME),
	95	ASN1_IMP_OPT(GENERAL_SUBTREE, minimum, ASN1_INTEGER, 0),
	96	ASN1_IMP_OPT(GENERAL_SUBTREE, maximum, ASN1_INTEGER, 1)
3e575651 SL	97	} ASN1_SEQUENCE_END(GENERAL_SUBTREE)
	98
	99	ASN1_SEQUENCE(NAME_CONSTRAINTS) = {
d3819813 MTL	100	ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, permittedSubtrees,
	101	GENERAL_SUBTREE, 0),
	102	ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, excludedSubtrees,
	103	GENERAL_SUBTREE, 1),
3e575651	104	} ASN1_SEQUENCE_END(NAME_CONSTRAINTS)
d3819813	105
3e575651 SL	106
	107	IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE)
	108	IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS)
	109
d3819813 MTL	110	static void v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD method,
	111	X509V3_CTX ctx, STACK_OF(CONF_VALUE) nval)
	112	{
	113	int i;
	114	CONF_VALUE tval, *val;
	115	STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
	116	NAME_CONSTRAINTS *ncons = NULL;
	117	GENERAL_SUBTREE *sub = NULL;
	118	ncons = NAME_CONSTRAINTS_new();
031e5cce	119	if (!ncons)
d3819813 MTL	120	goto memerr;
	121	for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
	122	val = sk_CONF_VALUE_value(nval, i);
031e5cce	123	if (!strncmp(val->name, "permitted", 9) && val->name[9]) {
d3819813 MTL	124	ptree = &ncons->permittedSubtrees;
d3819813 MTL	125	tval.name = val->name + 10;
031e5cce	126	} else if (!strncmp(val->name, "excluded", 8) && val->name[8]) {
d3819813 MTL	127	ptree = &ncons->excludedSubtrees;
	128	tval.name = val->name + 9;
	129	} else {
	130	X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, X509V3_R_INVALID_SYNTAX);
	131	goto err;
	132	}
	133	tval.value = val->value;
	134	sub = GENERAL_SUBTREE_new();
62f0afa2 MTL	135	if (sub == NULL)
62f0afa2 MTL	136	goto memerr;
d3819813 MTL	137	if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
d3819813 MTL	138	goto err;
031e5cce	139	if (!*ptree)
d3819813	140	*ptree = sk_GENERAL_SUBTREE_new_null();
031e5cce	141	if (!ptree \|\| !sk_GENERAL_SUBTREE_push(ptree, sub))
d3819813 MTL	142	goto memerr;
	143	sub = NULL;
	144	}
	145
	146	return ncons;
	147
	148	memerr:
	149	X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
	150	err:
031e5cce SM	151	if (ncons)
	152	NAME_CONSTRAINTS_free(ncons);
	153	if (sub)
	154	GENERAL_SUBTREE_free(sub);
d3819813 MTL	155
	156	return NULL;
	157	}
	158
	159	static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD method, void a,
	160	BIO *bp, int ind)
	161	{
	162	NAME_CONSTRAINTS *ncons = a;
	163	do_i2r_name_constraints(method, ncons->permittedSubtrees,
	164	bp, ind, "Permitted");
	165	do_i2r_name_constraints(method, ncons->excludedSubtrees,
	166	bp, ind, "Excluded");
	167	return 1;
	168	}
	169
	170	static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
	171	STACK_OF(GENERAL_SUBTREE) *trees,
031e5cce	172	BIO bp, int ind, char name)
d3819813 MTL	173	{
	174	GENERAL_SUBTREE *tree;
	175	int i;
	176	if (sk_GENERAL_SUBTREE_num(trees) > 0)
	177	BIO_printf(bp, "%*s%s:\n", ind, "", name);
	178	for (i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++) {
	179	tree = sk_GENERAL_SUBTREE_value(trees, i);
	180	BIO_printf(bp, "%*s", ind + 2, "");
	181	if (tree->base->type == GEN_IPADD)
	182	print_nc_ipadd(bp, tree->base->d.ip);
	183	else
	184	GENERAL_NAME_print(bp, tree->base);
	185	BIO_puts(bp, "\n");
	186	}
	187	return 1;
	188	}
3e575651 SL	189
3e575651 SL	190	static int print_nc_ipadd(BIO bp, ASN1_OCTET_STRING ip)
d3819813 MTL	191	{
	192	int i, len;
	193	unsigned char *p;
	194	p = ip->data;
	195	len = ip->length;
	196	BIO_puts(bp, "IP:");
	197	if (len == 8) {
	198	BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
	199	p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
	200	} else if (len == 32) {
	201	for (i = 0; i < 16; i++) {
	202	BIO_printf(bp, "%X", p[0] << 8 \| p[1]);
	203	p += 2;
	204	if (i == 7)
	205	BIO_puts(bp, "/");
	206	else if (i != 15)
	207	BIO_puts(bp, ":");
	208	}
	209	} else
	210	BIO_printf(bp, "IP Address:<invalid>");
	211	return 1;
	212	}
	213
	214	/*-
	215	* Check a certificate conforms to a specified set of constraints.
	216	* Return values:
	217	* X509_V_OK: All constraints obeyed.
	218	* X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
	219	* X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
	220	* X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
	221	* X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: Unsupported constraint type.
	222	* X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
	223	* X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
	224	*/
	225
	226	int NAME_CONSTRAINTS_check(X509 x, NAME_CONSTRAINTS nc)
	227	{
	228	int r, i;
	229	X509_NAME *nm;
	230
	231	nm = X509_get_subject_name(x);
	232
	233	if (X509_NAME_entry_count(nm) > 0) {
	234	GENERAL_NAME gntmp;
	235	gntmp.type = GEN_DIRNAME;
	236	gntmp.d.directoryName = nm;
	237
	238	r = nc_match(&gntmp, nc);
	239
	240	if (r != X509_V_OK)
	241	return r;
	242
	243	gntmp.type = GEN_EMAIL;
	244
	245	/* Process any email address attributes in subject name */
	246
	247	for (i = -1;;) {
031e5cce	248	X509_NAME_ENTRY *ne;
d3819813 MTL	249	i = X509_NAME_get_index_by_NID(nm, NID_pkcs9_emailAddress, i);
	250	if (i == -1)
	251	break;
	252	ne = X509_NAME_get_entry(nm, i);
	253	gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
	254	if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
	255	return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
	256
	257	r = nc_match(&gntmp, nc);
	258
	259	if (r != X509_V_OK)
	260	return r;
	261	}
	262
	263	}
	264
	265	for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++) {
	266	GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
	267	r = nc_match(gen, nc);
	268	if (r != X509_V_OK)
	269	return r;
	270	}
	271
	272	return X509_V_OK;
	273
	274	}
	275
	276	static int nc_match(GENERAL_NAME gen, NAME_CONSTRAINTS nc)
	277	{
	278	GENERAL_SUBTREE *sub;
	279	int i, r, match = 0;
	280
	281	/*
	282	* Permitted subtrees: if any subtrees exist of matching the type at
	283	* least one subtree must match.
	284	*/
	285
	286	for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++) {
	287	sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
	288	if (gen->type != sub->base->type)
	289	continue;
	290	if (sub->minimum \|\| sub->maximum)
	291	return X509_V_ERR_SUBTREE_MINMAX;
	292	/* If we already have a match don't bother trying any more */
	293	if (match == 2)
	294	continue;
	295	if (match == 0)
	296	match = 1;
	297	r = nc_match_single(gen, sub->base);
	298	if (r == X509_V_OK)
	299	match = 2;
	300	else if (r != X509_V_ERR_PERMITTED_VIOLATION)
	301	return r;
	302	}
	303
	304	if (match == 1)
	305	return X509_V_ERR_PERMITTED_VIOLATION;
	306
	307	/* Excluded subtrees: must not match any of these */
	308
	309	for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++) {
	310	sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
	311	if (gen->type != sub->base->type)
	312	continue;
313	if (sub->minimum \|\| sub->maximum)
314	return X509_V_ERR_SUBTREE_MINMAX;
315
316	r = nc_match_single(gen, sub->base);
317	if (r == X509_V_OK)
318	return X509_V_ERR_EXCLUDED_VIOLATION;
319	else if (r != X509_V_ERR_PERMITTED_VIOLATION)
320	return r;
321
322	}
323
324	return X509_V_OK;
325
326	}
327
328	static int nc_match_single(GENERAL_NAME gen, GENERAL_NAME base)
329	{
330	switch (base->type) {
331	case GEN_DIRNAME:
332	return nc_dn(gen->d.directoryName, base->d.directoryName);
333
334	case GEN_DNS:
335	return nc_dns(gen->d.dNSName, base->d.dNSName);
336
337	case GEN_EMAIL:
338	return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
339
340	case GEN_URI:
341	return nc_uri(gen->d.uniformResourceIdentifier,
342	base->d.uniformResourceIdentifier);
343
344	default:
345	return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
346	}
347
348	}
349
350	/*
351	* directoryName name constraint matching. The canonical encoding of
352	* X509_NAME makes this comparison easy. It is matched if the subtree is a
353	* subset of the name.
354	*/
355
356	static int nc_dn(X509_NAME nm, X509_NAME base)
357	{
358	/* Ensure canonical encodings are up to date. */
359	if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
360	return X509_V_ERR_OUT_OF_MEM;
361	if (base->modified && i2d_X509_NAME(base, NULL) < 0)
362	return X509_V_ERR_OUT_OF_MEM;
363	if (base->canon_enclen > nm->canon_enclen)
364	return X509_V_ERR_PERMITTED_VIOLATION;
365	if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
366	return X509_V_ERR_PERMITTED_VIOLATION;
367	return X509_V_OK;
368	}
369
370	static int nc_dns(ASN1_IA5STRING dns, ASN1_IA5STRING base)
371	{
372	char baseptr = (char )base->data;
373	char dnsptr = (char )dns->data;
374	/* Empty matches everything */
375	if (!*baseptr)
376	return X509_V_OK;
377	/*
378	* Otherwise can add zero or more components on the left so compare RHS
379	* and if dns is longer and expect '.' as preceding character.
380	*/
381	if (dns->length > base->length) {
382	dnsptr += dns->length - base->length;
383	if (*baseptr != '.' && dnsptr[-1] != '.')
384	return X509_V_ERR_PERMITTED_VIOLATION;
385	}
386
387	if (strcasecmp(baseptr, dnsptr))
388	return X509_V_ERR_PERMITTED_VIOLATION;
389
390	return X509_V_OK;
391
392	}
393
394	static int nc_email(ASN1_IA5STRING eml, ASN1_IA5STRING base)
395	{
396	const char baseptr = (char )base->data;
397	const char emlptr = (char )eml->data;
398
399	const char *baseat = strchr(baseptr, '@');
400	const char *emlat = strchr(emlptr, '@');
401	if (!emlat)
402	return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
031e5cce	403	/* Special case: inital '.' is RHS match */
d3819813 MTL	404	if (!baseat && (*baseptr == '.')) {
	405	if (eml->length > base->length) {
	406	emlptr += eml->length - base->length;
031e5cce	407	if (!strcasecmp(baseptr, emlptr))
d3819813 MTL	408	return X509_V_OK;
	409	}
	410	return X509_V_ERR_PERMITTED_VIOLATION;
	411	}
	412
	413	/* If we have anything before '@' match local part */
	414
	415	if (baseat) {
	416	if (baseat != baseptr) {
	417	if ((baseat - baseptr) != (emlat - emlptr))
	418	return X509_V_ERR_PERMITTED_VIOLATION;
	419	/* Case sensitive match of local part */
	420	if (strncmp(baseptr, emlptr, emlat - emlptr))
	421	return X509_V_ERR_PERMITTED_VIOLATION;
	422	}
	423	/* Position base after '@' */
	424	baseptr = baseat + 1;
	425	}
	426	emlptr = emlat + 1;
	427	/* Just have hostname left to match: case insensitive */
	428	if (strcasecmp(baseptr, emlptr))
	429	return X509_V_ERR_PERMITTED_VIOLATION;
	430
	431	return X509_V_OK;
	432
	433	}
	434
	435	static int nc_uri(ASN1_IA5STRING uri, ASN1_IA5STRING base)
	436	{
	437	const char baseptr = (char )base->data;
	438	const char hostptr = (char )uri->data;
	439	const char *p = strchr(hostptr, ':');
	440	int hostlen;
	441	/* Check for foo:// and skip past it */
	442	if (!p \|\| (p[1] != '/') \|\| (p[2] != '/'))
	443	return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
	444	hostptr = p + 3;
	445
	446	/* Determine length of hostname part of URI */
	447
	448	/* Look for a port indicator as end of hostname first */
	449
	450	p = strchr(hostptr, ':');
	451	/* Otherwise look for trailing slash */
	452	if (!p)
	453	p = strchr(hostptr, '/');
	454
	455	if (!p)
	456	hostlen = strlen(hostptr);
	457	else
	458	hostlen = p - hostptr;
	459
	460	if (hostlen == 0)
	461	return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
	462
031e5cce	463	/* Special case: inital '.' is RHS match */
d3819813 MTL	464	if (*baseptr == '.') {
	465	if (hostlen > base->length) {
	466	p = hostptr + hostlen - base->length;
031e5cce	467	if (!strncasecmp(p, baseptr, base->length))
d3819813 MTL	468	return X509_V_OK;
	469	}
	470	return X509_V_ERR_PERMITTED_VIOLATION;
	471	}
	472
	473	if ((base->length != (int)hostlen)
	474	\|\| strncasecmp(hostptr, baseptr, hostlen))
	475	return X509_V_ERR_PERMITTED_VIOLATION;
	476
	477	return X509_V_OK;
3e575651	478
d3819813	479	}