/* x509_trs.c */

/*

 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project

 * 1999.

 */

/* ====================================================================

 * Copyright (c) 1999 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/x509v3.h>

static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b);

static void trtable_free(X509_TRUST *p);

static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);

static int trust_1oid(X509_TRUST *trust, X509 *x, int flags);

static int trust_compat(X509_TRUST *trust, X509 *x, int flags);

static int obj_trust(int id, X509 *x, int flags);

static int (*default_trust) (int id, X509 *x, int flags) = obj_trust;

/*

 * WARNING: the following table should be kept in order of trust and without

 * any gaps so we can just subtract the minimum trust value to get an index

 * into the table

 */

static X509_TRUST trstandard[] = {

    {X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL},

    {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth,

     NULL},

    {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Server", NID_server_auth,

     NULL},

    {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect,

     NULL},

    {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign,

     NULL},

    {X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign,

     NULL},

    {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP,

     NULL},

    {X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL}

};

#define X509_TRUST_COUNT        (sizeof(trstandard)/sizeof(X509_TRUST))

IMPLEMENT_STACK_OF(X509_TRUST)

static STACK_OF(X509_TRUST) *trtable = NULL;

static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b)

{

    return (*a)->trust - (*b)->trust;

}

int (*X509_TRUST_set_default(int (*trust) (int, X509 *, int))) (int, X509 *,

                                                                int) {

    int (*oldtrust) (int, X509 *, int);

    oldtrust = default_trust;

    default_trust = trust;

    return oldtrust;

}

int X509_check_trust(X509 *x, int id, int flags)

{

    X509_TRUST *pt;

    int idx;

    if (id == -1)

        return 1;

    /* We get this as a default value */

    if (id == 0) {

        int rv;

        rv = obj_trust(NID_anyExtendedKeyUsage, x, 0);

        if (rv != X509_TRUST_UNTRUSTED)

            return rv;

        return trust_compat(NULL, x, 0);

    }

    idx = X509_TRUST_get_by_id(id);

    if (idx == -1)

        return default_trust(id, x, flags);

    pt = X509_TRUST_get0(idx);

    return pt->check_trust(pt, x, flags);

}

int X509_TRUST_get_count(void)

{

    if (!trtable)

        return X509_TRUST_COUNT;

    return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;

}

X509_TRUST *X509_TRUST_get0(int idx)

{

    if (idx < 0)

        return NULL;

    if (idx < (int)X509_TRUST_COUNT)

        return trstandard + idx;

    return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);

}

int X509_TRUST_get_by_id(int id)

{

    X509_TRUST tmp;

    int idx;

    if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))

        return id - X509_TRUST_MIN;

    tmp.trust = id;

    if (!trtable)

        return -1;

    idx = sk_X509_TRUST_find(trtable, &tmp);

    if (idx == -1)

        return -1;

    return idx + X509_TRUST_COUNT;

}

int X509_TRUST_set(int *t, int trust)

{

    if (X509_TRUST_get_by_id(trust) == -1) {

        X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST);

        return 0;

    }

    *t = trust;

    return 1;

}

int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int),

                   char *name, int arg1, void *arg2)

{

    int idx;

    X509_TRUST *trtmp;

    /*

     * This is set according to what we change: application can't set it

     */

    flags &= ~X509_TRUST_DYNAMIC;

    /* This will always be set for application modified trust entries */

    flags |= X509_TRUST_DYNAMIC_NAME;

    /* Get existing entry if any */

    idx = X509_TRUST_get_by_id(id);

    /* Need a new entry */

    if (idx == -1) {

        if (!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) {

            X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);

            return 0;

        }

        trtmp->flags = X509_TRUST_DYNAMIC;

    } else

        trtmp = X509_TRUST_get0(idx);

    /* OPENSSL_free existing name if dynamic */

    if (trtmp->flags & X509_TRUST_DYNAMIC_NAME)

        OPENSSL_free(trtmp->name);

    /* dup supplied name */

    if (!(trtmp->name = BUF_strdup(name))) {

        X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);

        return 0;

    }

    /* Keep the dynamic flag of existing entry */

    trtmp->flags &= X509_TRUST_DYNAMIC;

    /* Set all other flags */

    trtmp->flags |= flags;

    trtmp->trust = id;

    trtmp->check_trust = ck;

    trtmp->arg1 = arg1;

    trtmp->arg2 = arg2;

    /* If its a new entry manage the dynamic table */

    if (idx == -1) {

        if (!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {

            X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);

            return 0;

        }

        if (!sk_X509_TRUST_push(trtable, trtmp)) {

            X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);

            return 0;

        }

    }

    return 1;

}

static void trtable_free(X509_TRUST *p)

{

    if (!p)

        return;

    if (p->flags & X509_TRUST_DYNAMIC) {

        if (p->flags & X509_TRUST_DYNAMIC_NAME)

            OPENSSL_free(p->name);

        OPENSSL_free(p);

    }

}

void X509_TRUST_cleanup(void)

{

    unsigned int i;

    for (i = 0; i < X509_TRUST_COUNT; i++)

        trtable_free(trstandard + i);

    sk_X509_TRUST_pop_free(trtable, trtable_free);

    trtable = NULL;

}

int X509_TRUST_get_flags(X509_TRUST *xp)

{

    return xp->flags;

}

char *X509_TRUST_get0_name(X509_TRUST *xp)

{

    return xp->name;

}

int X509_TRUST_get_trust(X509_TRUST *xp)

{

    return xp->trust;

}

static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)

{

    if (x->aux && (x->aux->trust || x->aux->reject))

        return obj_trust(trust->arg1, x, flags);

    /*

     * we don't have any trust settings: for compatibility we return trusted

     * if it is self signed

     */

    return trust_compat(trust, x, flags);

}

static int trust_1oid(X509_TRUST *trust, X509 *x, int flags)

{

    if (x->aux)

        return obj_trust(trust->arg1, x, flags);

    return X509_TRUST_UNTRUSTED;

}

static int trust_compat(X509_TRUST *trust, X509 *x, int flags)

{

    X509_check_purpose(x, -1, 0);

    if (x->ex_flags & EXFLAG_SS)

        return X509_TRUST_TRUSTED;

    else

        return X509_TRUST_UNTRUSTED;

}

static int obj_trust(int id, X509 *x, int flags)

{

    ASN1_OBJECT *obj;

    int i;

    X509_CERT_AUX *ax;

    ax = x->aux;

    if (!ax)

        return X509_TRUST_UNTRUSTED;

    if (ax->reject) {

        for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {

            obj = sk_ASN1_OBJECT_value(ax->reject, i);

            if (OBJ_obj2nid(obj) == id)

                return X509_TRUST_REJECTED;

        }

    }

    if (ax->trust) {

        for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {

            obj = sk_ASN1_OBJECT_value(ax->trust, i);

            if (OBJ_obj2nid(obj) == id)

                return X509_TRUST_TRUSTED;

        }

    }

    return X509_TRUST_UNTRUSTED;

}