/* crypto/asn1/x_crl.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS 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 AUTHOR OR 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.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/asn1t.h>

#include "asn1_locl.h"

#include <openssl/x509.h>

#include <openssl/x509v3.h>

static int X509_REVOKED_cmp(const X509_REVOKED *const *a,

                            const X509_REVOKED *const *b);

static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);

ASN1_SEQUENCE(X509_REVOKED) = {

        ASN1_SIMPLE(X509_REVOKED,serialNumber, ASN1_INTEGER),

        ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),

        ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)

} ASN1_SEQUENCE_END(X509_REVOKED)

static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);

static int def_crl_lookup(X509_CRL *crl,

                          X509_REVOKED **ret, ASN1_INTEGER *serial,

                          X509_NAME *issuer);

static X509_CRL_METHOD int_crl_meth = {

    0,

    0, 0,

    def_crl_lookup,

    def_crl_verify

};

static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;

/*

 * The X509_CRL_INFO structure needs a bit of customisation. Since we cache

 * the original encoding the signature wont be affected by reordering of the

 * revoked field.

 */

static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,

                      void *exarg)

{

    X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;

    if (!a || !a->revoked)

        return 1;

    switch (operation) {

        /*

         * Just set cmp function here. We don't sort because that would

         * affect the output of X509_CRL_print().

         */

    case ASN1_OP_D2I_POST:

        (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp);

        break;

    }

    return 1;

}

ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {

        ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),

        ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR),

        ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),

        ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),

        ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),

        ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),

        ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)

} ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)

/*

 * Set CRL entry issuer according to CRL certificate issuer extension. Check

 * for unhandled critical CRL entry extensions.

 */

static int crl_set_issuers(X509_CRL *crl)

{

    int i, j;

    GENERAL_NAMES *gens, *gtmp;

    STACK_OF(X509_REVOKED) *revoked;

    revoked = X509_CRL_get_REVOKED(crl);

    gens = NULL;

    for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) {

        X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);

        STACK_OF(X509_EXTENSION) *exts;

        ASN1_ENUMERATED *reason;

        X509_EXTENSION *ext;

        gtmp = X509_REVOKED_get_ext_d2i(rev,

                                        NID_certificate_issuer, &j, NULL);

        if (!gtmp && (j != -1)) {

            crl->flags |= EXFLAG_INVALID;

            return 1;

        }

        if (gtmp) {

            gens = gtmp;

            if (!crl->issuers) {

                crl->issuers = sk_GENERAL_NAMES_new_null();

                if (!crl->issuers)

                    return 0;

            }

            if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))

                return 0;

        }

        rev->issuer = gens;

        reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL);

        if (!reason && (j != -1)) {

            crl->flags |= EXFLAG_INVALID;

            return 1;

        }

        if (reason) {

            rev->reason = ASN1_ENUMERATED_get(reason);

            ASN1_ENUMERATED_free(reason);

        } else

            rev->reason = CRL_REASON_NONE;

        /* Check for critical CRL entry extensions */

        exts = rev->extensions;

        for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) {

            ext = sk_X509_EXTENSION_value(exts, j);

            if (ext->critical > 0) {

                if (OBJ_obj2nid(ext->object) == NID_certificate_issuer)

                    continue;

                crl->flags |= EXFLAG_CRITICAL;

                break;

            }

        }

    }

    return 1;

}

/*

 * The X509_CRL structure needs a bit of customisation. Cache some extensions

 * and hash of the whole CRL.

 */

static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,

                  void *exarg)

{

    X509_CRL *crl = (X509_CRL *)*pval;

    STACK_OF(X509_EXTENSION) *exts;

    X509_EXTENSION *ext;

    int idx;

    switch (operation) {

    case ASN1_OP_NEW_POST:

        crl->idp = NULL;

        crl->akid = NULL;

        crl->flags = 0;

        crl->idp_flags = 0;

        crl->idp_reasons = CRLDP_ALL_REASONS;

        crl->meth = default_crl_method;

        crl->meth_data = NULL;

        crl->issuers = NULL;

        crl->crl_number = NULL;

        crl->base_crl_number = NULL;

        break;

    case ASN1_OP_D2I_POST:

#ifndef OPENSSL_NO_SHA

        X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);

#endif

        crl->idp = X509_CRL_get_ext_d2i(crl,

                                        NID_issuing_distribution_point, NULL,

                                        NULL);

        if (crl->idp)

            setup_idp(crl, crl->idp);

        crl->akid = X509_CRL_get_ext_d2i(crl,

                                         NID_authority_key_identifier, NULL,

                                         NULL);

        crl->crl_number = X509_CRL_get_ext_d2i(crl,

                                               NID_crl_number, NULL, NULL);

        crl->base_crl_number = X509_CRL_get_ext_d2i(crl,

                                                    NID_delta_crl, NULL,

                                                    NULL);

        /* Delta CRLs must have CRL number */

        if (crl->base_crl_number && !crl->crl_number)

            crl->flags |= EXFLAG_INVALID;

        /*

         * See if we have any unhandled critical CRL extensions and indicate

         * this in a flag. We only currently handle IDP so anything else

         * critical sets the flag. This code accesses the X509_CRL structure

         * directly: applications shouldn't do this.

         */

        exts = crl->crl->extensions;

        for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {

            int nid;

            ext = sk_X509_EXTENSION_value(exts, idx);

            nid = OBJ_obj2nid(ext->object);

            if (nid == NID_freshest_crl)

                crl->flags |= EXFLAG_FRESHEST;

            if (ext->critical > 0) {

                /* We handle IDP and deltas */

                if ((nid == NID_issuing_distribution_point)

                    || (nid == NID_authority_key_identifier)

                    || (nid == NID_delta_crl))

                    continue;

                crl->flags |= EXFLAG_CRITICAL;

                break;

            }

        }

        if (!crl_set_issuers(crl))

            return 0;

        if (crl->meth->crl_init) {

            if (crl->meth->crl_init(crl) == 0)

                return 0;

        }

        break;

    case ASN1_OP_FREE_POST:

        if (crl->meth->crl_free) {

            if (!crl->meth->crl_free(crl))

                return 0;

        }

        if (crl->akid)

            AUTHORITY_KEYID_free(crl->akid);

        if (crl->idp)

            ISSUING_DIST_POINT_free(crl->idp);

        ASN1_INTEGER_free(crl->crl_number);

        ASN1_INTEGER_free(crl->base_crl_number);

        sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);

        break;

    }

    return 1;

}

/* Convert IDP into a more convenient form */

static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)

{

    int idp_only = 0;

    /* Set various flags according to IDP */

    crl->idp_flags |= IDP_PRESENT;

    if (idp->onlyuser > 0) {

        idp_only++;

        crl->idp_flags |= IDP_ONLYUSER;

    }

    if (idp->onlyCA > 0) {

        idp_only++;

        crl->idp_flags |= IDP_ONLYCA;

    }

    if (idp->onlyattr > 0) {

        idp_only++;

        crl->idp_flags |= IDP_ONLYATTR;

    }

    if (idp_only > 1)

        crl->idp_flags |= IDP_INVALID;

    if (idp->indirectCRL > 0)

        crl->idp_flags |= IDP_INDIRECT;

    if (idp->onlysomereasons) {

        crl->idp_flags |= IDP_REASONS;

        if (idp->onlysomereasons->length > 0)

            crl->idp_reasons = idp->onlysomereasons->data[0];

        if (idp->onlysomereasons->length > 1)

            crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);

        crl->idp_reasons &= CRLDP_ALL_REASONS;

    }

    DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));

}

ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = {

        ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),

        ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),

        ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)

} ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)

IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)

IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)

IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)

IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)

IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)

static int X509_REVOKED_cmp(const X509_REVOKED *const *a,

                            const X509_REVOKED *const *b)

{

    return (ASN1_STRING_cmp((ASN1_STRING *)(*a)->serialNumber,

                            (ASN1_STRING *)(*b)->serialNumber));

}

int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)

{

    X509_CRL_INFO *inf;

    inf = crl->crl;

    if (!inf->revoked)

        inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);

    if (!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {

        ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);

        return 0;

    }

    inf->enc.modified = 1;

    return 1;

}

int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)

{

    if (crl->meth->crl_verify)

        return crl->meth->crl_verify(crl, r);

    return 0;

}

int X509_CRL_get0_by_serial(X509_CRL *crl,

                            X509_REVOKED **ret, ASN1_INTEGER *serial)

{

    if (crl->meth->crl_lookup)

        return crl->meth->crl_lookup(crl, ret, serial, NULL);

    return 0;

}

int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)

{

    if (crl->meth->crl_lookup)

        return crl->meth->crl_lookup(crl, ret,

                                     X509_get_serialNumber(x),

                                     X509_get_issuer_name(x));

    return 0;

}

static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)

{

    return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),

                             crl->sig_alg, crl->signature, crl->crl, r));

}

static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,

                                    X509_REVOKED *rev)

{

    int i;

    if (!rev->issuer) {

        if (!nm)

            return 1;

        if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))

            return 1;

        return 0;

    }

    if (!nm)

        nm = X509_CRL_get_issuer(crl);

    for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {

        GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);

        if (gen->type != GEN_DIRNAME)

            continue;

        if (!X509_NAME_cmp(nm, gen->d.directoryName))

            return 1;

    }

    return 0;

}

static int def_crl_lookup(X509_CRL *crl,

                          X509_REVOKED **ret, ASN1_INTEGER *serial,

                          X509_NAME *issuer)

{

    X509_REVOKED rtmp, *rev;

    int idx;

    rtmp.serialNumber = serial;

    /*

     * Sort revoked into serial number order if not already sorted. Do this

     * under a lock to avoid race condition.

     */

    if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked)) {

        CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL);

        sk_X509_REVOKED_sort(crl->crl->revoked);

        CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL);

    }

    idx = sk_X509_REVOKED_find(crl->crl->revoked, &rtmp);

    if (idx < 0)

        return 0;

    /* Need to look for matching name */

    for (; idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++) {

        rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);

        if (ASN1_INTEGER_cmp(rev->serialNumber, serial))

            return 0;

        if (crl_revoked_issuer_match(crl, issuer, rev)) {

            if (ret)

                *ret = rev;

            if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)

                return 2;

            return 1;

        }

    }

    return 0;

}

void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)

{

    if (meth == NULL)

        default_crl_method = &int_crl_meth;

    else

        default_crl_method = meth;

}

X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),

                                     int (*crl_free) (X509_CRL *crl),

                                     int (*crl_lookup) (X509_CRL *crl,

                                                        X509_REVOKED **ret,

                                                        ASN1_INTEGER *ser,

                                                        X509_NAME *issuer),

                                     int (*crl_verify) (X509_CRL *crl,

                                                        EVP_PKEY *pk))

{

    X509_CRL_METHOD *m;

    m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));

    if (!m)

        return NULL;

    m->crl_init = crl_init;

    m->crl_free = crl_free;

    m->crl_lookup = crl_lookup;

    m->crl_verify = crl_verify;

    m->flags = X509_CRL_METHOD_DYNAMIC;

    return m;

}

void X509_CRL_METHOD_free(X509_CRL_METHOD *m)

{

    if (!(m->flags & X509_CRL_METHOD_DYNAMIC))

        return;

    OPENSSL_free(m);

}

void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)

{

    crl->meth_data = dat;

}

void *X509_CRL_get_meth_data(X509_CRL *crl)

{

    return crl->meth_data;

}

IMPLEMENT_STACK_OF(X509_REVOKED)

IMPLEMENT_ASN1_SET_OF(X509_REVOKED)

IMPLEMENT_STACK_OF(X509_CRL)

IMPLEMENT_ASN1_SET_OF(X509_CRL)