wolfssl/src/x509_str.c

/* x509_str.c
 *
 * Copyright (C) 2006-2022 wolfSSL Inc.
 *
 * This file is part of wolfSSL.
 *
 * wolfSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * wolfSSL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
 */


#ifdef HAVE_CONFIG_H
    #include <config.h>
#endif

#include <wolfssl/wolfcrypt/settings.h>

#if !defined(WOLFSSL_X509_STORE_INCLUDED)
    #ifndef WOLFSSL_IGNORE_FILE_WARN
        #warning x509_str.c does not need to be compiled separately from ssl.c
    #endif
#else

#ifndef WOLFCRYPT_ONLY

#ifndef NO_CERTS

/*******************************************************************************
 * START OF X509_STORE_CTX APIs
 ******************************************************************************/

#ifdef OPENSSL_EXTRA

WOLFSSL_X509_STORE_CTX* wolfSSL_X509_STORE_CTX_new(void)
{
    WOLFSSL_X509_STORE_CTX* ctx;
    WOLFSSL_ENTER("X509_STORE_CTX_new");

    ctx = (WOLFSSL_X509_STORE_CTX*)XMALLOC(sizeof(WOLFSSL_X509_STORE_CTX), NULL,
                                    DYNAMIC_TYPE_X509_CTX);
    if (ctx != NULL) {
        ctx->param = NULL;
        wolfSSL_X509_STORE_CTX_init(ctx, NULL, NULL, NULL);
    }

    return ctx;
}


int wolfSSL_X509_STORE_CTX_init(WOLFSSL_X509_STORE_CTX* ctx,
     WOLFSSL_X509_STORE* store, WOLFSSL_X509* x509, WOLF_STACK_OF(WOLFSSL_X509)* sk)
{
    WOLFSSL_X509* x509_cert;
    int ret = 0;
    (void)sk;
    WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_init");

    if (ctx != NULL) {
        ctx->store = store;
        #ifndef WOLFSSL_X509_STORE_CERTS
        ctx->current_cert = x509;
        #else
        if(x509 != NULL){
            ctx->current_cert = wolfSSL_X509_d2i(NULL, x509->derCert->buffer,
                    x509->derCert->length);
            if(ctx->current_cert == NULL)
                return WOLFSSL_FAILURE;
        } else
            ctx->current_cert = NULL;
        #endif

        ctx->chain  = sk;
        /* Add intermediate certificates from stack to store */
        while (sk != NULL) {
            x509_cert = sk->data.x509;
            if (x509_cert != NULL && x509_cert->isCa) {
                ret = wolfSSL_X509_STORE_add_cert(store, x509_cert);
                if (ret < 0) {
                    return WOLFSSL_FAILURE;
                }
            }
            sk = sk->next;
        }

        ctx->sesChain = NULL;
        ctx->domain = NULL;
#ifdef HAVE_EX_DATA
        XMEMSET(&ctx->ex_data, 0, sizeof(ctx->ex_data));
#endif
        ctx->userCtx = NULL;
        ctx->error = 0;
        ctx->error_depth = 0;
        ctx->discardSessionCerts = 0;

        if (ctx->param == NULL) {
            ctx->param = (WOLFSSL_X509_VERIFY_PARAM*)XMALLOC(
                           sizeof(WOLFSSL_X509_VERIFY_PARAM),
                           NULL, DYNAMIC_TYPE_OPENSSL);
            if (ctx->param == NULL){
                WOLFSSL_MSG("wolfSSL_X509_STORE_CTX_init failed");
                return WOLFSSL_FAILURE;
            }
        }

        return WOLFSSL_SUCCESS;
    }
    return WOLFSSL_FAILURE;
}


/* free's extra data */
void wolfSSL_X509_STORE_CTX_free(WOLFSSL_X509_STORE_CTX* ctx)
{
    WOLFSSL_ENTER("X509_STORE_CTX_free");
    if (ctx != NULL) {
#ifdef HAVE_EX_DATA_CLEANUP_HOOKS
        wolfSSL_CRYPTO_cleanup_ex_data(&ctx->ex_data);
#endif

        if (ctx->param != NULL) {
            XFREE(ctx->param, NULL, DYNAMIC_TYPE_OPENSSL);
            ctx->param = NULL;
        }

        XFREE(ctx, NULL, DYNAMIC_TYPE_X509_CTX);
    }
}


void wolfSSL_X509_STORE_CTX_cleanup(WOLFSSL_X509_STORE_CTX* ctx)
{
    if (ctx != NULL) {

        if (ctx->param != NULL) {
            XFREE(ctx->param, NULL, DYNAMIC_TYPE_OPENSSL);
            ctx->param = NULL;
        }

        wolfSSL_X509_STORE_CTX_init(ctx, NULL, NULL, NULL);
    }
}


void wolfSSL_X509_STORE_CTX_trusted_stack(WOLFSSL_X509_STORE_CTX *ctx, WOLF_STACK_OF(WOLFSSL_X509) *sk)
{
    if (ctx != NULL) {
        ctx->chain = sk;
    }
}


/* Returns corresponding X509 error from internal ASN error <e> */
int GetX509Error(int e)
{
    switch (e) {
        case ASN_BEFORE_DATE_E:
            return X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
        case ASN_AFTER_DATE_E:
            return X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
        case ASN_NO_SIGNER_E: /* get issuer error if no CA found locally */
            return X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
        case ASN_SELF_SIGNED_E:
            return X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
        case ASN_PATHLEN_INV_E:
        case ASN_PATHLEN_SIZE_E:
            return X509_V_ERR_PATH_LENGTH_EXCEEDED;
        case ASN_SIG_OID_E:
        case ASN_SIG_CONFIRM_E:
        case ASN_SIG_HASH_E:
        case ASN_SIG_KEY_E:
            return X509_V_ERR_CERT_SIGNATURE_FAILURE;
        default:
#ifdef HAVE_WOLFSSL_MSG_EX
            WOLFSSL_MSG_EX("Error not configured or implemented yet: %d", e);
#else
            WOLFSSL_MSG("Error not configured or implemented yet");
#endif
            return e;
    }
}

/* Verifies certificate chain using WOLFSSL_X509_STORE_CTX
 * returns 0 on success or < 0 on failure.
 */
int wolfSSL_X509_verify_cert(WOLFSSL_X509_STORE_CTX* ctx)
{
    int ret = 0;
    int depth = 0;
    int error;
#ifndef NO_ASN_TIME
    byte *afterDate, *beforeDate;
#endif

    WOLFSSL_ENTER("wolfSSL_X509_verify_cert");

    if (ctx != NULL && ctx->store != NULL && ctx->store->cm != NULL
         && ctx->current_cert != NULL && ctx->current_cert->derCert != NULL) {
            ret = wolfSSL_CertManagerVerifyBuffer(ctx->store->cm,
                    ctx->current_cert->derCert->buffer,
                    ctx->current_cert->derCert->length,
                    WOLFSSL_FILETYPE_ASN1);

        /* If there was an error, process it and add it to CTX */
        if (ret < 0) {
            /* Get corresponding X509 error */
            error = GetX509Error(ret);
            /* Set error depth */
            if (ctx->chain)
                depth = (int)ctx->chain->num;

            wolfSSL_X509_STORE_CTX_set_error(ctx, error);
            wolfSSL_X509_STORE_CTX_set_error_depth(ctx, depth);
        #if defined(OPENSSL_ALL) || defined(WOLFSSL_QT)
            if (ctx->store && ctx->store->verify_cb)
                ctx->store->verify_cb(0, ctx);
        #endif
        }

    #ifndef NO_ASN_TIME
        error = 0;
        /* wolfSSL_CertManagerVerifyBuffer only returns ASN_AFTER_DATE_E or
         ASN_BEFORE_DATE_E if there are no additional errors found in the
         cert. Therefore, check if the cert is expired or not yet valid
         in order to return the correct expected error. */
        afterDate = ctx->current_cert->notAfter.data;
        beforeDate = ctx->current_cert->notBefore.data;

        if (XVALIDATE_DATE(afterDate, (byte)ctx->current_cert->notAfter.type,
                                                                   AFTER) < 1) {
            error = X509_V_ERR_CERT_HAS_EXPIRED;
        }
        else if (XVALIDATE_DATE(beforeDate,
                    (byte)ctx->current_cert->notBefore.type, BEFORE) < 1) {
            error = X509_V_ERR_CERT_NOT_YET_VALID;
        }

        if (error != 0 ) {
            wolfSSL_X509_STORE_CTX_set_error(ctx, error);
            wolfSSL_X509_STORE_CTX_set_error_depth(ctx, depth);
        #if defined(OPENSSL_ALL) || defined(WOLFSSL_QT)
            if (ctx->store && ctx->store->verify_cb)
                ctx->store->verify_cb(0, ctx);
        #endif
        }
    #endif

        /* OpenSSL returns 0 when a chain can't be built */
        if (ret == ASN_NO_SIGNER_E)
            return WOLFSSL_FAILURE;
        else
            return ret;
    }
    return WOLFSSL_FATAL_ERROR;
}

#endif /* OPENSSL_EXTRA */

#if defined(OPENSSL_EXTRA) || defined(WOLFSSL_WPAS_SMALL)
    WOLFSSL_X509* wolfSSL_X509_STORE_CTX_get_current_cert(
                                                    WOLFSSL_X509_STORE_CTX* ctx)
    {
        WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_get_current_cert");
        if (ctx)
            return ctx->current_cert;
        return NULL;
    }


    int wolfSSL_X509_STORE_CTX_get_error(WOLFSSL_X509_STORE_CTX* ctx)
    {
        WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_get_error");
        if (ctx != NULL)
            return ctx->error;
        return 0;
    }


    int wolfSSL_X509_STORE_CTX_get_error_depth(WOLFSSL_X509_STORE_CTX* ctx)
    {
        WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_get_error_depth");
        if(ctx)
            return ctx->error_depth;
        return WOLFSSL_FATAL_ERROR;
    }

/* get X509_STORE_CTX ex_data, max idx is MAX_EX_DATA */
void* wolfSSL_X509_STORE_CTX_get_ex_data(WOLFSSL_X509_STORE_CTX* ctx, int idx)
{
    WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_get_ex_data");
#ifdef HAVE_EX_DATA
    if (ctx != NULL) {
        return wolfSSL_CRYPTO_get_ex_data(&ctx->ex_data, idx);
    }
#else
    (void)ctx;
    (void)idx;
#endif
    return NULL;
}
#endif /* OPENSSL_EXTRA || WOLFSSL_WPAS_SMALL */

#ifdef OPENSSL_EXTRA
    void wolfSSL_X509_STORE_CTX_set_verify_cb(WOLFSSL_X509_STORE_CTX *ctx,
                                  WOLFSSL_X509_STORE_CTX_verify_cb verify_cb)
    {
        WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_set_verify_cb");
        if(ctx == NULL)
            return;
        ctx->verify_cb = verify_cb;
    }

/* Gets pointer to X509_STORE that was used to create context.
 *
 * Return valid pointer on success, NULL if ctx was NULL or not initialized
 */
WOLFSSL_X509_STORE* wolfSSL_X509_STORE_CTX_get0_store(
        WOLFSSL_X509_STORE_CTX* ctx)
{
    WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_get0_store");

    if (ctx == NULL)
        return NULL;

    return ctx->store;
}

WOLFSSL_X509* wolfSSL_X509_STORE_CTX_get0_cert(WOLFSSL_X509_STORE_CTX* ctx)
{
    if (ctx == NULL)
        return NULL;

    return ctx->current_cert;
}

void wolfSSL_X509_STORE_CTX_set_time(WOLFSSL_X509_STORE_CTX* ctx,
                                    unsigned long flags,
                                    time_t t)
{
    (void)flags;

    if (ctx == NULL || ctx->param == NULL)
        return;

    ctx->param->check_time = t;
    ctx->param->flags |= WOLFSSL_USE_CHECK_TIME;
}

#if defined(WOLFSSL_QT) || defined(OPENSSL_ALL)
#ifndef NO_WOLFSSL_STUB
int wolfSSL_X509_STORE_CTX_set_purpose(WOLFSSL_X509_STORE_CTX *ctx,
                                       int purpose)
{
    (void)ctx;
    (void)purpose;
    WOLFSSL_STUB("wolfSSL_X509_STORE_CTX_set_purpose (not implemented)");
    return 0;
}

void wolfSSL_X509_STORE_CTX_set_flags(WOLFSSL_X509_STORE_CTX *ctx,
        unsigned long flags)
{
    (void)ctx;
    (void)flags;
    WOLFSSL_STUB("wolfSSL_X509_STORE_CTX_set_flags (not implemented)");
}
#endif /* !NO_WOLFSSL_STUB */

#endif /* WOLFSSL_QT || OPENSSL_ALL */
#endif /* OPENSSL_EXTRA */

#ifdef OPENSSL_EXTRA

/* set X509_STORE_CTX ex_data, max idx is MAX_EX_DATA. Return WOLFSSL_SUCCESS
 * on success, WOLFSSL_FAILURE on error. */
int wolfSSL_X509_STORE_CTX_set_ex_data(WOLFSSL_X509_STORE_CTX* ctx, int idx,
                                       void *data)
{
    WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_set_ex_data");
#ifdef HAVE_EX_DATA
    if (ctx != NULL)
    {
        return wolfSSL_CRYPTO_set_ex_data(&ctx->ex_data, idx, data);
    }
#else
    (void)ctx;
    (void)idx;
    (void)data;
#endif
    return WOLFSSL_FAILURE;
}

#ifdef HAVE_EX_DATA_CLEANUP_HOOKS
/* set X509_STORE_CTX ex_data, max idx is MAX_EX_DATA. Return WOLFSSL_SUCCESS
 * on success, WOLFSSL_FAILURE on error. */
int wolfSSL_X509_STORE_CTX_set_ex_data_with_cleanup(
    WOLFSSL_X509_STORE_CTX* ctx,
    int idx,
    void *data,
    wolfSSL_ex_data_cleanup_routine_t cleanup_routine)
{
    WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_set_ex_data_with_cleanup");
    if (ctx != NULL)
    {
        return wolfSSL_CRYPTO_set_ex_data_with_cleanup(&ctx->ex_data, idx, data,
                                                       cleanup_routine);
    }
    return WOLFSSL_FAILURE;
}
#endif /* HAVE_EX_DATA_CLEANUP_HOOKS */

#if defined(WOLFSSL_APACHE_HTTPD) || defined(OPENSSL_ALL)
void wolfSSL_X509_STORE_CTX_set_depth(WOLFSSL_X509_STORE_CTX* ctx, int depth)
{
    WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_set_depth");
    if (ctx)
        ctx->depth = depth;
}
#endif


WOLFSSL_X509* wolfSSL_X509_STORE_CTX_get0_current_issuer(
        WOLFSSL_X509_STORE_CTX* ctx)
{
    int ret;
    WOLFSSL_X509* issuer;

    WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_get0_current_issuer");

    if (ctx == NULL) {
        return NULL;
    }

    ret = wolfSSL_X509_STORE_CTX_get1_issuer(&issuer, ctx, ctx->current_cert);
    if (ret == WOLFSSL_SUCCESS) {
        return issuer;
    }

    return NULL;
}

/* Set an error stat in the X509 STORE CTX
 *
 */
void wolfSSL_X509_STORE_CTX_set_error(WOLFSSL_X509_STORE_CTX* ctx, int er)
{
    WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_set_error");

    if (ctx != NULL) {
        ctx->error = er;
    }
}

/* Set the error depth in the X509 STORE CTX */
void wolfSSL_X509_STORE_CTX_set_error_depth(WOLFSSL_X509_STORE_CTX* ctx,
                                                                      int depth)
{
    WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_set_error_depth");

    if (ctx != NULL) {
        ctx->error_depth = depth;
    }
}

WOLFSSL_STACK* wolfSSL_X509_STORE_CTX_get_chain(WOLFSSL_X509_STORE_CTX* ctx)
{
    WOLFSSL_ENTER("wolfSSL_X509_STORE_CTX_get_chain");

    if (ctx == NULL) {
        return NULL;
    }

#ifdef SESSION_CERTS
    /* if chain is null but sesChain is available then populate stack */
    if (ctx->chain == NULL && ctx->sesChain != NULL) {
        int i;
        WOLFSSL_X509_CHAIN* c = ctx->sesChain;
        WOLFSSL_STACK*     sk = (WOLFSSL_STACK*)XMALLOC(sizeof(WOLFSSL_STACK),
                                    NULL, DYNAMIC_TYPE_X509);

        if (sk == NULL) {
            return NULL;
        }

        XMEMSET(sk, 0, sizeof(WOLFSSL_STACK));

        for (i = 0; i < c->count && i < MAX_CHAIN_DEPTH; i++) {
            WOLFSSL_X509* x509 = wolfSSL_get_chain_X509(c, i);

            if (x509 == NULL) {
                WOLFSSL_MSG("Unable to get x509 from chain");
                wolfSSL_sk_X509_pop_free(sk, NULL);
                return NULL;
            }

            if (wolfSSL_sk_X509_push(sk, x509) != WOLFSSL_SUCCESS) {
                WOLFSSL_MSG("Unable to load x509 into stack");
                wolfSSL_sk_X509_pop_free(sk, NULL);
                wolfSSL_X509_free(x509);
                return NULL;
            }
        }

#if defined(WOLFSSL_NGINX) || defined(WOLFSSL_HAPROXY) || defined(OPENSSL_EXTRA)
        /* add CA used to verify top of chain to the list */
        if (c->count > 0) {
            WOLFSSL_X509* x509 = wolfSSL_get_chain_X509(c, c->count - 1);
            if (x509 != NULL) {
                WOLFSSL_X509* issuer = NULL;
                if (wolfSSL_X509_STORE_CTX_get1_issuer(&issuer, ctx, x509)
                        == WOLFSSL_SUCCESS) {
                    /* check that the certificate being looked up is not self
                     * signed and that a issuer was found */
                    if (issuer != NULL && wolfSSL_X509_NAME_cmp(&x509->issuer,
                                &x509->subject) != 0) {
                        if (wolfSSL_sk_X509_push(sk, issuer) != WOLFSSL_SUCCESS) {
                            WOLFSSL_MSG("Unable to load CA x509 into stack");
                            wolfSSL_sk_X509_pop_free(sk, NULL);
                            wolfSSL_X509_free(issuer);
                            return NULL;
                        }
                    }
                    else {
                        WOLFSSL_MSG("Certificate is self signed");
                        if (issuer != NULL)
                            wolfSSL_X509_free(issuer);
                    }
                }
                else {
                    WOLFSSL_MSG("Could not find CA for certificate");
                }
            }
        }
#endif
        ctx->chain = sk;
    }
#endif /* SESSION_CERTS */

    return ctx->chain;
}

/* like X509_STORE_CTX_get_chain(), but return a copy with data reference
   counts increased */
WOLFSSL_STACK* wolfSSL_X509_STORE_CTX_get1_chain(WOLFSSL_X509_STORE_CTX* ctx)
{
    WOLFSSL_STACK* ref;

    if (ctx == NULL) {
        return NULL;
    }

    /* get chain in ctx */
    ref = wolfSSL_X509_STORE_CTX_get_chain(ctx);
    if (ref == NULL) {
        return ref;
    }

    /* create duplicate of ctx chain */
    return wolfSSL_sk_dup(ref);
}

#ifndef NO_WOLFSSL_STUB
WOLFSSL_X509_STORE_CTX *wolfSSL_X509_STORE_CTX_get0_parent_ctx(
                                                   WOLFSSL_X509_STORE_CTX *ctx)
{
    (void)ctx;
    WOLFSSL_STUB("wolfSSL_X509_STORE_CTX_get0_parent_ctx");
    return NULL;
}

int wolfSSL_X509_STORE_get_by_subject(WOLFSSL_X509_STORE_CTX* ctx, int idx,
                            WOLFSSL_X509_NAME* name, WOLFSSL_X509_OBJECT* obj)
{
    (void)ctx;
    (void)idx;
    (void)name;
    (void)obj;
    WOLFSSL_STUB("X509_STORE_get_by_subject");
    return 0;
}
#endif


#endif /* OPENSSL_EXTRA */

#if defined(OPENSSL_EXTRA) && !defined(NO_FILESYSTEM)
#if defined(WOLFSSL_SIGNER_DER_CERT)
WOLF_STACK_OF(WOLFSSL_X509)* wolfSSL_X509_STORE_get1_certs(
    WOLFSSL_X509_STORE_CTX* ctx, WOLFSSL_X509_NAME* name)
{
    WOLF_STACK_OF(WOLFSSL_X509)* ret = NULL;
    int err = 0;
    WOLFSSL_X509_STORE* store = NULL;
    WOLFSSL_STACK* sk = NULL;
    WOLFSSL_STACK* certToFilter = NULL;
    WOLFSSL_X509_NAME* certToFilterName = NULL;
    WOLF_STACK_OF(WOLFSSL_X509)* filteredCerts = NULL;
    WOLFSSL_X509* filteredCert = NULL;

    WOLFSSL_ENTER("wolfSSL_X509_STORE_get1_certs");

    if (name == NULL) {
        err = 1;
    }

    if (err == 0) {
        store = wolfSSL_X509_STORE_CTX_get0_store(ctx);
        if (store == NULL) {
            err = 1;
        }
    }

    if (err == 0) {
        filteredCerts = wolfSSL_sk_X509_new_null();
        if (filteredCerts == NULL) {
            err = 1;
        }
    }

    if (err == 0) {
        sk = wolfSSL_CertManagerGetCerts(store->cm);
        if (sk == NULL) {
            err = 1;
        }
    }

    if (err == 0) {
        certToFilter = sk;
        while (certToFilter != NULL) {
            certToFilterName = wolfSSL_X509_get_subject_name(
                                    certToFilter->data.x509);
            if (certToFilterName != NULL) {
                if (wolfSSL_X509_NAME_cmp(certToFilterName, name) == 0) {
                    filteredCert = wolfSSL_X509_dup(certToFilter->data.x509);
                    if (filteredCert == NULL) {
                        err = 1;
                        break;
                    }
                    else {
                        wolfSSL_sk_X509_push(filteredCerts, filteredCert);
                    }
                }
            }
            certToFilter = certToFilter->next;
        }
    }

    if (err == 1) {
        if (filteredCerts != NULL) {
            wolfSSL_sk_X509_pop_free(filteredCerts, NULL);
        }
        ret = NULL;
    }
    else {
        ret = filteredCerts;
    }

    if (sk != NULL) {
        wolfSSL_sk_X509_pop_free(sk, NULL);
    }

    return ret;
}
#endif /* WOLFSSL_SIGNER_DER_CERT */

#endif /* OPENSSL_EXTRA && !NO_FILESYSTEM */

#if defined(WOLFSSL_NGINX) || defined(WOLFSSL_HAPROXY) || \
    defined(OPENSSL_EXTRA) || defined(OPENSSL_ALL)
int wolfSSL_X509_STORE_CTX_get1_issuer(WOLFSSL_X509 **issuer,
    WOLFSSL_X509_STORE_CTX *ctx, WOLFSSL_X509 *x)
{
    WOLFSSL_STACK* node;

    if (issuer == NULL || ctx == NULL || x == NULL)
        return WOLFSSL_FATAL_ERROR;

    if (ctx->chain != NULL) {
        for (node = ctx->chain; node != NULL; node = node->next) {
            if (wolfSSL_X509_check_issued(node->data.x509, x) == X509_V_OK) {
                *issuer = x;
                return WOLFSSL_SUCCESS;
            }
        }
    }

    /* Result is ignored when passed to wolfSSL_OCSP_cert_to_id(). */

    return x509GetIssuerFromCM(issuer, ctx->store->cm, x);
}
#endif /* WOLFSSL_NGINX || WOLFSSL_HAPROXY || OPENSSL_EXTRA || OPENSSL_ALL */

/*******************************************************************************
 * END OF X509_STORE_CTX APIs
 ******************************************************************************/

/*******************************************************************************
 * START OF X509_STORE APIs
 ******************************************************************************/

#if defined(OPENSSL_EXTRA) || defined(HAVE_WEBSERVER) || \
    defined(WOLFSSL_WPAS_SMALL)
WOLFSSL_X509_STORE* wolfSSL_X509_STORE_new(void)
{
    WOLFSSL_X509_STORE* store = NULL;
    WOLFSSL_ENTER("SSL_X509_STORE_new");

    if ((store = (WOLFSSL_X509_STORE*)XMALLOC(sizeof(WOLFSSL_X509_STORE), NULL,
                                    DYNAMIC_TYPE_X509_STORE)) == NULL)
        goto err_exit;

    XMEMSET(store, 0, sizeof(WOLFSSL_X509_STORE));
    store->isDynamic = 1;
    store->refCount = 1;

#ifndef SINGLE_THREADED
    if (wc_InitMutex(&store->refMutex) != 0)
        goto err_exit;
#endif

    if ((store->cm = wolfSSL_CertManagerNew()) == NULL)
        goto err_exit;

#ifdef HAVE_CRL
    store->crl = store->cm->crl;
#endif

#if defined(OPENSSL_EXTRA) || defined(WOLFSSL_WPAS_SMALL)

    /* Link store's new Certificate Manager to self by default */
    store->cm->x509_store_p = store;

    if ((store->param = (WOLFSSL_X509_VERIFY_PARAM*)XMALLOC(
                           sizeof(WOLFSSL_X509_VERIFY_PARAM),
                           NULL, DYNAMIC_TYPE_OPENSSL)) == NULL) {
        goto err_exit;
    }
    XMEMSET(store->param, 0, sizeof(WOLFSSL_X509_VERIFY_PARAM));
    if ((store->lookup.dirs = (WOLFSSL_BY_DIR*)XMALLOC(sizeof(WOLFSSL_BY_DIR),
                           NULL, DYNAMIC_TYPE_OPENSSL)) == NULL) {
        WOLFSSL_MSG("store->lookup.dir memory allocation error");
        goto err_exit;
    }
    XMEMSET(store->lookup.dirs, 0, sizeof(WOLFSSL_BY_DIR));
    if (wc_InitMutex(&store->lookup.dirs->lock) != 0) {
            WOLFSSL_MSG("Bad mutex init");
            goto err_exit;
    }
#endif

    return store;

err_exit:
    if (store == NULL)
        return NULL;

    wolfSSL_X509_STORE_free(store);

    return NULL;
}

void wolfSSL_X509_STORE_free(WOLFSSL_X509_STORE* store)
{
    int doFree = 0;
    if (store != NULL && store->isDynamic) {
#ifndef SINGLE_THREADED
        if (wc_LockMutex(&store->refMutex) != 0) {
            WOLFSSL_MSG("Couldn't lock store mutex");
        }
#endif
        store->refCount--;
        if (store->refCount == 0)
            doFree = 1;
#ifndef SINGLE_THREADED
        wc_UnLockMutex(&store->refMutex);
#endif

        if (doFree) {
#ifdef HAVE_EX_DATA_CLEANUP_HOOKS
            wolfSSL_CRYPTO_cleanup_ex_data(&store->ex_data);
#endif
            if (store->cm != NULL) {
                wolfSSL_CertManagerFree(store->cm);
                store->cm = NULL;
            }
#ifdef OPENSSL_ALL
            if (store->objs != NULL) {
                wolfSSL_sk_X509_OBJECT_pop_free(store->objs, NULL);
            }
#endif
#if defined(OPENSSL_EXTRA) || defined(WOLFSSL_WPAS_SMALL)
            if (store->param != NULL) {
                XFREE(store->param, NULL, DYNAMIC_TYPE_OPENSSL);
                store->param = NULL;
            }

            if (store->lookup.dirs != NULL) {
#if defined(OPENSSL_ALL) && !defined(NO_FILESYSTEM) && !defined(NO_WOLFSSL_DIR)
                if (store->lookup.dirs->dir_entry) {
                    wolfSSL_sk_BY_DIR_entry_free(store->lookup.dirs->dir_entry);
                }
#endif
                wc_FreeMutex(&store->lookup.dirs->lock);
                XFREE(store->lookup.dirs, NULL, DYNAMIC_TYPE_OPENSSL);
                store->lookup.dirs = NULL;
            }
#endif
            XFREE(store, NULL, DYNAMIC_TYPE_X509_STORE);
        }
    }
}

/**
 * Get ex_data in WOLFSSL_STORE at given index
 * @param store a pointer to WOLFSSL_X509_STORE structure
 * @param idx   Index of ex_data to get data from
 * @return void pointer to ex_data on success or NULL on failure
 */
void* wolfSSL_X509_STORE_get_ex_data(WOLFSSL_X509_STORE* store, int idx)
{
    WOLFSSL_ENTER("wolfSSL_X509_STORE_get_ex_data");
#ifdef HAVE_EX_DATA
    if (store != NULL && idx < MAX_EX_DATA && idx >= 0) {
        return wolfSSL_CRYPTO_get_ex_data(&store->ex_data, idx);
    }
#else
    (void)store;
    (void)idx;
#endif
    return NULL;
}

int wolfSSL_X509_STORE_up_ref(WOLFSSL_X509_STORE* store)
{
    if (store) {
#ifndef SINGLE_THREADED
        if (wc_LockMutex(&store->refMutex) != 0) {
            WOLFSSL_MSG("Failed to lock store mutex");
            return WOLFSSL_FAILURE;
        }
#endif
        store->refCount++;
#ifndef SINGLE_THREADED
        wc_UnLockMutex(&store->refMutex);
#endif

        return WOLFSSL_SUCCESS;
    }

    return WOLFSSL_FAILURE;
}

/**
 * Set ex_data for WOLFSSL_STORE
 * @param store a pointer to WOLFSSL_X509_STORE structure
 * @param idx   Index of ex data to set
 * @param data  Data to set in ex data
 * @return WOLFSSL_SUCCESS on success or WOLFSSL_FAILURE on failure
 */
int wolfSSL_X509_STORE_set_ex_data(WOLFSSL_X509_STORE* store, int idx,
                                                                     void *data)
{
    WOLFSSL_ENTER("wolfSSL_X509_STORE_set_ex_data");
#ifdef HAVE_EX_DATA
    if (store != NULL && idx < MAX_EX_DATA) {
        return wolfSSL_CRYPTO_set_ex_data(&store->ex_data, idx, data);
    }
#else
    (void)store;
    (void)idx;
    (void)data;
#endif
    return WOLFSSL_FAILURE;
}

#ifdef HAVE_EX_DATA_CLEANUP_HOOKS
/**
 * Set ex_data for WOLFSSL_STORE
 * @param store a pointer to WOLFSSL_X509_STORE structure
 * @param idx   Index of ex data to set
 * @param data  Data to set in ex data
 * @return WOLFSSL_SUCCESS on success or WOLFSSL_FAILURE on failure
 */
int wolfSSL_X509_STORE_set_ex_data_with_cleanup(
    WOLFSSL_X509_STORE* store,
    int idx,
    void *data,
    wolfSSL_ex_data_cleanup_routine_t cleanup_routine)
{
    WOLFSSL_ENTER("wolfSSL_X509_STORE_set_ex_data_with_cleanup");
    if (store != NULL && idx < MAX_EX_DATA) {
        return wolfSSL_CRYPTO_set_ex_data_with_cleanup(&store->ex_data, idx,
                                                       data, cleanup_routine);
    }
    return WOLFSSL_FAILURE;
}

#endif /* HAVE_EX_DATA_CLEANUP_HOOKS */

#endif /* OPENSSL_EXTRA || HAVE_WEBSERVER || WOLFSSL_WPAS_SMALL */

#ifdef OPENSSL_EXTRA

#if defined(WOLFSSL_QT) || defined(OPENSSL_ALL)
    void wolfSSL_X509_STORE_set_verify_cb(WOLFSSL_X509_STORE *st,
                                 WOLFSSL_X509_STORE_CTX_verify_cb verify_cb)
    {
        WOLFSSL_ENTER("WOLFSSL_X509_STORE_set_verify_cb");
        if (st != NULL) {
            st->verify_cb = verify_cb;
        }
    }
#endif /* WOLFSSL_QT || OPENSSL_ALL */

WOLFSSL_X509_LOOKUP* wolfSSL_X509_STORE_add_lookup(WOLFSSL_X509_STORE* store,
                                               WOLFSSL_X509_LOOKUP_METHOD* m)
{
    WOLFSSL_ENTER("SSL_X509_STORE_add_lookup");
    if (store == NULL || m == NULL)
        return NULL;

    /* Make sure the lookup has a back reference to the store. */
    store->lookup.store = store;
    /* store a type to know which method wants to be used for */
    store->lookup.type = m->type;
    return &store->lookup;
}

int wolfSSL_X509_STORE_add_cert(WOLFSSL_X509_STORE* store, WOLFSSL_X509* x509)
{
    int result = WOLFSSL_FATAL_ERROR;

    WOLFSSL_ENTER("wolfSSL_X509_STORE_add_cert");
    if (store != NULL && store->cm != NULL && x509 != NULL
                                                && x509->derCert != NULL) {
        DerBuffer* derCert = NULL;

        result = AllocDer(&derCert, x509->derCert->length,
            x509->derCert->type, NULL);
        if (result == 0) {
            /* AddCA() frees the buffer. */
            XMEMCPY(derCert->buffer,
                            x509->derCert->buffer, x509->derCert->length);
            result = AddCA(store->cm, &derCert, WOLFSSL_USER_CA, VERIFY);
        }
    }

    WOLFSSL_LEAVE("wolfSSL_X509_STORE_add_cert", result);

    if (result != WOLFSSL_SUCCESS) {
        result = WOLFSSL_FATAL_ERROR;
    }

    return result;
}

int wolfSSL_X509_STORE_set_flags(WOLFSSL_X509_STORE* store, unsigned long flag)
{
    int ret = WOLFSSL_SUCCESS;

    WOLFSSL_ENTER("wolfSSL_X509_STORE_set_flags");

    if (store == NULL)
        return WOLFSSL_FAILURE;

    if ((flag & WOLFSSL_CRL_CHECKALL) || (flag & WOLFSSL_CRL_CHECK)) {
        ret = wolfSSL_CertManagerEnableCRL(store->cm, (int)flag);
    }

    return ret;
}


int wolfSSL_X509_STORE_set_default_paths(WOLFSSL_X509_STORE* store)
{
    (void)store;
    return WOLFSSL_SUCCESS;
}

#if !defined(NO_FILESYSTEM) && !defined(NO_WOLFSSL_DIR)
/* Loads certificate(s) files in pem format into X509_STORE struct from either
 * a file or directory.
 * Returns WOLFSSL_SUCCESS on success or WOLFSSL_FAILURE if an error occurs.
 */
WOLFSSL_API int wolfSSL_X509_STORE_load_locations(WOLFSSL_X509_STORE *str,
                                              const char *file, const char *dir)
{
    WOLFSSL_CTX* ctx;
    char *name = NULL;
    int ret = WOLFSSL_SUCCESS;
    int successes = 0;
#ifdef WOLFSSL_SMALL_STACK
    ReadDirCtx* readCtx = NULL;
#else
    ReadDirCtx  readCtx[1];
#endif

    WOLFSSL_ENTER("X509_STORE_load_locations");

    if (str == NULL || str->cm == NULL || (file == NULL  && dir == NULL))
        return WOLFSSL_FAILURE;

    /* tmp ctx for setting our cert manager */
    ctx = wolfSSL_CTX_new(cm_pick_method());
    if (ctx == NULL)
        return WOLFSSL_FAILURE;

    wolfSSL_CertManagerFree(ctx->cm);
    ctx->cm = str->cm;

#ifdef HAVE_CRL
    if (str->cm->crl == NULL) {
        if (wolfSSL_CertManagerEnableCRL(str->cm, 0) != WOLFSSL_SUCCESS) {
            WOLFSSL_MSG("Enable CRL failed");
            wolfSSL_CTX_free(ctx);
            return WOLFSSL_FAILURE;
        }
    }
#endif

    /* Load individual file */
    if (file) {
        /* Try to process file with type DETECT_CERT_TYPE to parse the
           correct certificate header and footer type */
        ret = ProcessFile(ctx, file, WOLFSSL_FILETYPE_PEM, DETECT_CERT_TYPE,
                                                      NULL, 0, str->cm->crl, 0);
        if (ret != WOLFSSL_SUCCESS) {
            WOLFSSL_MSG("Failed to load file");
            ret = WOLFSSL_FAILURE;
        }
    }

    /* Load files in dir */
    if (dir && ret == WOLFSSL_SUCCESS) {
        #ifdef WOLFSSL_SMALL_STACK
            readCtx = (ReadDirCtx*)XMALLOC(sizeof(ReadDirCtx), ctx->heap,
                                                       DYNAMIC_TYPE_TMP_BUFFER);
            if (readCtx == NULL) {
                WOLFSSL_MSG("Memory error");
                wolfSSL_CTX_free(ctx);
                return WOLFSSL_FAILURE;
            }
        #endif

        /* try to load each regular file in dir */
        ret = wc_ReadDirFirst(readCtx, dir, &name);
        while (ret == 0 && name) {
            WOLFSSL_MSG(name);
            /* Try to process file with type DETECT_CERT_TYPE to parse the
               correct certificate header and footer type */
            ret = ProcessFile(ctx, name, WOLFSSL_FILETYPE_PEM, DETECT_CERT_TYPE,
                                                      NULL, 0, str->cm->crl, 0);
            /* Not failing on load errors */
            if (ret != WOLFSSL_SUCCESS)
                WOLFSSL_MSG("Failed to load file in path, continuing");
            else
                successes++;

            ret = wc_ReadDirNext(readCtx, dir, &name);
        }
        wc_ReadDirClose(readCtx);

        /* Success if at least one file in dir was loaded */
        if (successes > 0)
            ret = WOLFSSL_SUCCESS;
        else {
            WOLFSSL_ERROR(ret);
            ret = WOLFSSL_FAILURE;
        }

        #ifdef WOLFSSL_SMALL_STACK
            XFREE(readCtx, ctx->heap, DYNAMIC_TYPE_TMP_BUFFER);
        #endif
    }

    ctx->cm = NULL;
    wolfSSL_CTX_free(ctx);

    return ret;
}
#endif /* !NO_FILESYSTEM && !NO_WOLFSSL_DIR */

int wolfSSL_X509_CA_num(WOLFSSL_X509_STORE* store)
{
    int i = 0;
    int cnt_ret = 0;
    Signer **table;

    WOLFSSL_ENTER("wolfSSL_X509_CA_num");
    if (store == NULL || store->cm == NULL){
        WOLFSSL_MSG("invalid parameter");
        return WOLFSSL_FAILURE;
    }

    table = store->cm->caTable;
    if (table){
        if (wc_LockMutex(&store->cm->caLock) == 0){
            for (i = 0; i < CA_TABLE_SIZE; i++) {
                Signer* signer = table[i];
                while (signer) {
                    Signer* next = signer->next;
                    cnt_ret++;
                    signer = next;
                }
            }
            wc_UnLockMutex(&store->cm->caLock);
        }
    }

    return cnt_ret;
}

/******************************************************************************
* wolfSSL_X509_STORE_GetCerts - retrieve stack of X509 in a certificate store ctx
*
* This API can be used in SSL verify callback function to view cert chain
* See examples/client/client.c and myVerify() function in test.h
*
* RETURNS:
* returns stack of X509 certs on success, otherwise returns a NULL.
*/
WOLFSSL_STACK* wolfSSL_X509_STORE_GetCerts(WOLFSSL_X509_STORE_CTX* s)
{
    int  certIdx = 0;
    WOLFSSL_BUFFER_INFO* cert = NULL;
    DecodedCert* dCert = NULL;
    WOLFSSL_X509* x509 = NULL;
    WOLFSSL_STACK* sk = NULL;
    int found = 0;

    if (s == NULL) {
        return NULL;
    }

    sk = wolfSSL_sk_X509_new_null();

    if (sk == NULL) {
        return NULL;
    }

    for (certIdx = s->totalCerts - 1; certIdx >= 0; certIdx--) {
        /* get certificate buffer */
        cert = &s->certs[certIdx];

        dCert = (DecodedCert*)XMALLOC(sizeof(DecodedCert), NULL, DYNAMIC_TYPE_DCERT);

        if (dCert == NULL) {
            goto error;
        }
        XMEMSET(dCert, 0, sizeof(DecodedCert));

        InitDecodedCert(dCert, cert->buffer, cert->length, NULL);

        /* Parse Certificate */
        if (ParseCert(dCert, CERT_TYPE, NO_VERIFY, NULL)){
            goto error;
        }
        x509 = wolfSSL_X509_new();

        if (x509 == NULL) {
            goto error;
        }
        InitX509(x509, 1, NULL);

        if (CopyDecodedToX509(x509, dCert) == 0) {

            if (wolfSSL_sk_X509_push(sk, x509) != WOLFSSL_SUCCESS) {
                WOLFSSL_MSG("Unable to load x509 into stack");
                wolfSSL_X509_free(x509);
                goto error;
            }
        }
        else {
            goto error;
        }
        found = 1;

        FreeDecodedCert(dCert);
        XFREE(dCert, NULL, DYNAMIC_TYPE_DCERT);
        dCert = NULL;
    }

    if (!found) {
        wolfSSL_sk_X509_pop_free(sk, NULL);
        sk = NULL;
    }
    return sk;

error:
    if (dCert) {
        FreeDecodedCert(dCert);
        XFREE(dCert, NULL, DYNAMIC_TYPE_DCERT);
    }

    if (sk)
        wolfSSL_sk_X509_pop_free(sk, NULL);

    return NULL;
}
#endif /* OPENSSL_EXTRA */

#ifdef OPENSSL_ALL
WOLF_STACK_OF(WOLFSSL_X509_OBJECT)* wolfSSL_X509_STORE_get0_objects(
    WOLFSSL_X509_STORE* store)
{
    WOLFSSL_STACK* ret = NULL;
    WOLFSSL_STACK* cert_stack = NULL;
    WOLFSSL_X509* x509 = NULL;
    WOLFSSL_ENTER("wolfSSL_X509_STORE_get0_objects");

    if (store == NULL || store->cm == NULL) {
        WOLFSSL_MSG("Missing or empty store");
        return NULL;
    }

    if (store->objs != NULL) {
#if defined(WOLFSSL_SIGNER_DER_CERT) && !defined(NO_FILESYSTEM)
        /* want to update objs stack by cm stack again before returning it*/
        wolfSSL_sk_X509_OBJECT_pop_free(store->objs, NULL);
        store->objs = NULL;
#else
        if (wolfSSL_sk_X509_OBJECT_num(store->objs) == 0) {
            /* Let's try generating the stack again */
            wolfSSL_sk_X509_OBJECT_pop_free(store->objs, NULL);
            store->objs = NULL;
        }
        else
            return store->objs;
#endif
    }

    if ((ret = wolfSSL_sk_X509_OBJECT_new()) == NULL) {
        WOLFSSL_MSG("wolfSSL_sk_X509_OBJECT_new error");
        goto err_cleanup;
    }

#if defined(WOLFSSL_SIGNER_DER_CERT) && !defined(NO_FILESYSTEM)
    cert_stack = wolfSSL_CertManagerGetCerts(store->cm);
    /* wolfSSL_sk_X509_pop checks for NULL */
    while ((x509 = wolfSSL_sk_X509_pop(cert_stack)) != NULL) {
        WOLFSSL_X509_OBJECT* obj = wolfSSL_X509_OBJECT_new();
        if (obj == NULL) {
            WOLFSSL_MSG("wolfSSL_X509_OBJECT_new error");
            goto err_cleanup;
        }
        if (wolfSSL_sk_X509_OBJECT_push(ret, obj) != WOLFSSL_SUCCESS) {
            WOLFSSL_MSG("wolfSSL_sk_X509_OBJECT_push error");
            wolfSSL_X509_OBJECT_free(obj);
            goto err_cleanup;
        }
        obj->type = WOLFSSL_X509_LU_X509;
        obj->data.x509 = x509;
    }
#endif

#ifdef HAVE_CRL
    if (store->cm->crl != NULL) {
        WOLFSSL_X509_OBJECT* obj = wolfSSL_X509_OBJECT_new();
        if (obj == NULL) {
            WOLFSSL_MSG("wolfSSL_X509_OBJECT_new error");
            goto err_cleanup;
        }
        if (wolfSSL_sk_X509_OBJECT_push(ret, obj) != WOLFSSL_SUCCESS) {
            WOLFSSL_MSG("wolfSSL_sk_X509_OBJECT_push error");
            wolfSSL_X509_OBJECT_free(obj);
            goto err_cleanup;
        }
        obj->type = WOLFSSL_X509_LU_CRL;
        obj->data.crl = store->cm->crl;
    }
#endif

    if (cert_stack)
        wolfSSL_sk_X509_pop_free(cert_stack, NULL);
    store->objs = ret;
    return ret;
err_cleanup:
    if (ret)
        wolfSSL_sk_X509_OBJECT_free(ret);
    if (cert_stack)
        wolfSSL_sk_X509_pop_free(cert_stack, NULL);
    if (x509)
        wolfSSL_X509_free(x509);
    return NULL;
}
#endif /* OPENSSL_ALL */

/*******************************************************************************
 * END OF X509_STORE APIs
 ******************************************************************************/

#endif /* NO_CERTS */

#endif /* !WOLFCRYPT_ONLY */

#endif /* !WOLFSSL_X509_STORE_INCLUDED */