Import LibreSSL v2.4.2 to vendor branch

[dragonfly.git] / crypto / libressl / ssl / ssl_cert.c

/* $OpenBSD: ssl_cert.c,v 1.51 2015/09/11 17:37:47 jsing Exp $ */
/* 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.]
 */
/* ====================================================================
 * Copyright (c) 1998-2007 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
 *    openssl-core@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).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * ECC cipher suite support in OpenSSL originally developed by
 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 */

#include <sys/types.h>

#include <dirent.h>
#include <stdio.h>
#include <unistd.h>

#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/objects.h>
#include <openssl/opensslconf.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>

#include "ssl_locl.h"

int
SSL_get_ex_data_X509_STORE_CTX_idx(void)
{
        static volatile int ssl_x509_store_ctx_idx = -1;
        int got_write_lock = 0;

        CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);

        if (ssl_x509_store_ctx_idx < 0) {
                CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
                CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
                got_write_lock = 1;

                if (ssl_x509_store_ctx_idx < 0) {
                        ssl_x509_store_ctx_idx =
                            X509_STORE_CTX_get_ex_new_index(
                                0, "SSL for verify callback", NULL, NULL, NULL);
                }
        }

        if (got_write_lock)
                CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
        else
                CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);

        return ssl_x509_store_ctx_idx;
}

static void
ssl_cert_set_default_md(CERT *cert)
{
        /* Set digest values to defaults */
        cert->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
        cert->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
        cert->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
        cert->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
#ifndef OPENSSL_NO_GOST
        cert->pkeys[SSL_PKEY_GOST01].digest = EVP_gostr341194();
#endif
}

CERT *
ssl_cert_new(void)
{
        CERT *ret;

        ret = calloc(1, sizeof(CERT));
        if (ret == NULL) {
                SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE);
                return (NULL);
        }
        ret->key = &(ret->pkeys[SSL_PKEY_RSA_ENC]);
        ret->references = 1;
        ssl_cert_set_default_md(ret);
        return (ret);
}

CERT *
ssl_cert_dup(CERT *cert)
{
        CERT *ret;
        int i;

        ret = calloc(1, sizeof(CERT));
        if (ret == NULL) {
                SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
                return (NULL);
        }

        /*
         * same as ret->key = ret->pkeys + (cert->key - cert->pkeys),
         * if you find that more readable
         */
        ret->key = &ret->pkeys[cert->key - &cert->pkeys[0]];

        ret->valid = cert->valid;
        ret->mask_k = cert->mask_k;
        ret->mask_a = cert->mask_a;

        if (cert->dh_tmp != NULL) {
                ret->dh_tmp = DHparams_dup(cert->dh_tmp);
                if (ret->dh_tmp == NULL) {
                        SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_DH_LIB);
                        goto err;
                }
                if (cert->dh_tmp->priv_key) {
                        BIGNUM *b = BN_dup(cert->dh_tmp->priv_key);
                        if (!b) {
                                SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_BN_LIB);
                                goto err;
                        }
                        ret->dh_tmp->priv_key = b;
                }
                if (cert->dh_tmp->pub_key) {
                        BIGNUM *b = BN_dup(cert->dh_tmp->pub_key);
                        if (!b) {
                                SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_BN_LIB);
                                goto err;
                        }
                        ret->dh_tmp->pub_key = b;
                }
        }
        ret->dh_tmp_cb = cert->dh_tmp_cb;
        ret->dh_tmp_auto = cert->dh_tmp_auto;

        if (cert->ecdh_tmp) {
                ret->ecdh_tmp = EC_KEY_dup(cert->ecdh_tmp);
                if (ret->ecdh_tmp == NULL) {
                        SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_EC_LIB);
                        goto err;
                }
        }
        ret->ecdh_tmp_cb = cert->ecdh_tmp_cb;
        ret->ecdh_tmp_auto = cert->ecdh_tmp_auto;

        for (i = 0; i < SSL_PKEY_NUM; i++) {
                if (cert->pkeys[i].x509 != NULL) {
                        ret->pkeys[i].x509 = cert->pkeys[i].x509;
                        CRYPTO_add(&ret->pkeys[i].x509->references, 1,
                        CRYPTO_LOCK_X509);
                }

                if (cert->pkeys[i].privatekey != NULL) {
                        ret->pkeys[i].privatekey = cert->pkeys[i].privatekey;
                        CRYPTO_add(&ret->pkeys[i].privatekey->references, 1,
                        CRYPTO_LOCK_EVP_PKEY);

                        switch (i) {
                                /*
                                 * If there was anything special to do for
                                 * certain types of keys, we'd do it here.
                                 * (Nothing at the moment, I think.)
                                 */

                        case SSL_PKEY_RSA_ENC:
                        case SSL_PKEY_RSA_SIGN:
                                /* We have an RSA key. */
                                break;

                        case SSL_PKEY_DSA_SIGN:
                                /* We have a DSA key. */
                                break;

                        case SSL_PKEY_DH_RSA:
                        case SSL_PKEY_DH_DSA:
                                /* We have a DH key. */
                                break;

                        case SSL_PKEY_ECC:
                                /* We have an ECC key */
                                break;

                        default:
                                /* Can't happen. */
                                SSLerr(SSL_F_SSL_CERT_DUP, SSL_R_LIBRARY_BUG);
                        }
                }
        }

        /*
         * ret->extra_certs *should* exist, but currently the own certificate
         * chain is held inside SSL_CTX
         */

        ret->references = 1;
        /*
         * Set digests to defaults. NB: we don't copy existing values
         * as they will be set during handshake.
         */
        ssl_cert_set_default_md(ret);

        return (ret);

err:
        DH_free(ret->dh_tmp);
        EC_KEY_free(ret->ecdh_tmp);

        for (i = 0; i < SSL_PKEY_NUM; i++) {
                X509_free(ret->pkeys[i].x509);
                EVP_PKEY_free(ret->pkeys[i].privatekey);
        }
        free (ret);
        return NULL;
}


void
ssl_cert_free(CERT *c)
{
        int i;

        if (c == NULL)
                return;

        i = CRYPTO_add(&c->references, -1, CRYPTO_LOCK_SSL_CERT);
        if (i > 0)
                return;

        DH_free(c->dh_tmp);
        EC_KEY_free(c->ecdh_tmp);

        for (i = 0; i < SSL_PKEY_NUM; i++) {
                X509_free(c->pkeys[i].x509);
                EVP_PKEY_free(c->pkeys[i].privatekey);
        }

        free(c);
}

int
ssl_cert_inst(CERT **o)
{
        /*
         * Create a CERT if there isn't already one
         * (which cannot really happen, as it is initially created in
         * SSL_CTX_new; but the earlier code usually allows for that one
         * being non-existant, so we follow that behaviour, as it might
         * turn out that there actually is a reason for it -- but I'm
         * not sure that *all* of the existing code could cope with
         * s->cert being NULL, otherwise we could do without the
         * initialization in SSL_CTX_new).
         */

        if (o == NULL) {
                SSLerr(SSL_F_SSL_CERT_INST, ERR_R_PASSED_NULL_PARAMETER);
                return (0);
        }
        if (*o == NULL) {
                if ((*o = ssl_cert_new()) == NULL) {
                        SSLerr(SSL_F_SSL_CERT_INST, ERR_R_MALLOC_FAILURE);
                        return (0);
                }
        }
        return (1);
}


SESS_CERT *
ssl_sess_cert_new(void)
{
        SESS_CERT *ret;

        ret = calloc(1, sizeof *ret);
        if (ret == NULL) {
                SSLerr(SSL_F_SSL_SESS_CERT_NEW, ERR_R_MALLOC_FAILURE);
                return NULL;
        }
        ret->peer_key = &(ret->peer_pkeys[SSL_PKEY_RSA_ENC]);
        ret->references = 1;

        return ret;
}

void
ssl_sess_cert_free(SESS_CERT *sc)
{
        int i;

        if (sc == NULL)
                return;

        i = CRYPTO_add(&sc->references, -1, CRYPTO_LOCK_SSL_SESS_CERT);
        if (i > 0)
                return;

        /* i == 0 */
        if (sc->cert_chain != NULL)
                sk_X509_pop_free(sc->cert_chain, X509_free);
        for (i = 0; i < SSL_PKEY_NUM; i++)
                X509_free(sc->peer_pkeys[i].x509);

        DH_free(sc->peer_dh_tmp);
        EC_KEY_free(sc->peer_ecdh_tmp);

        free(sc);
}

int
ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk)
{
        X509_STORE_CTX ctx;
        X509 *x;
        int ret;

        if ((sk == NULL) || (sk_X509_num(sk) == 0))
                return (0);

        x = sk_X509_value(sk, 0);
        if (!X509_STORE_CTX_init(&ctx, s->ctx->cert_store, x, sk)) {
                SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_X509_LIB);
                return (0);
        }
        X509_STORE_CTX_set_ex_data(&ctx,
            SSL_get_ex_data_X509_STORE_CTX_idx(), s);

        /*
         * We need to inherit the verify parameters. These can be
         * determined by the context: if its a server it will verify
         * SSL client certificates or vice versa.
         */
        X509_STORE_CTX_set_default(&ctx,
            s->server ? "ssl_client" : "ssl_server");

        /*
         * Anything non-default in "param" should overwrite anything
         * in the ctx.
         */
        X509_VERIFY_PARAM_set1(X509_STORE_CTX_get0_param(&ctx), s->param);

        if (s->verify_callback)
                X509_STORE_CTX_set_verify_cb(&ctx, s->verify_callback);

        if (s->ctx->app_verify_callback != NULL)
                ret = s->ctx->app_verify_callback(&ctx, s->ctx->app_verify_arg);
        else
                ret = X509_verify_cert(&ctx);

        s->verify_result = ctx.error;
        X509_STORE_CTX_cleanup(&ctx);

        return (ret);
}

static void
set_client_CA_list(STACK_OF(X509_NAME) **ca_list,
    STACK_OF(X509_NAME) *name_list)
{
        if (*ca_list != NULL)
                sk_X509_NAME_pop_free(*ca_list, X509_NAME_free);

        *ca_list = name_list;
}

STACK_OF(X509_NAME) *
SSL_dup_CA_list(STACK_OF(X509_NAME) *sk)
{
        int i;
        STACK_OF(X509_NAME) *ret;
        X509_NAME *name;

        ret = sk_X509_NAME_new_null();
        for (i = 0; i < sk_X509_NAME_num(sk); i++) {
                name = X509_NAME_dup(sk_X509_NAME_value(sk, i));
                if ((name == NULL) || !sk_X509_NAME_push(ret, name)) {
                        sk_X509_NAME_pop_free(ret, X509_NAME_free);
                        return (NULL);
                }
        }
        return (ret);
}

void
SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
{
        set_client_CA_list(&(s->client_CA), name_list);
}

void
SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
{
        set_client_CA_list(&(ctx->client_CA), name_list);
}

STACK_OF(X509_NAME) *
SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
{
        return (ctx->client_CA);
}

STACK_OF(X509_NAME) *
SSL_get_client_CA_list(const SSL *s)
{
        if (s->type == SSL_ST_CONNECT) {
                /* We are in the client. */
                if (((s->version >> 8) == SSL3_VERSION_MAJOR) &&
                    (s->s3 != NULL))
                        return (s->s3->tmp.ca_names);
                else
                        return (NULL);
        } else {
                if (s->client_CA != NULL)
                        return (s->client_CA);
                else
                        return (s->ctx->client_CA);
        }
}

static int
add_client_CA(STACK_OF(X509_NAME) **sk, X509 *x)
{
        X509_NAME *name;

        if (x == NULL)
                return (0);
        if ((*sk == NULL) && ((*sk = sk_X509_NAME_new_null()) == NULL))
                return (0);

        if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
                return (0);

        if (!sk_X509_NAME_push(*sk, name)) {
                X509_NAME_free(name);
                return (0);
        }
        return (1);
}

int
SSL_add_client_CA(SSL *ssl, X509 *x)
{
        return (add_client_CA(&(ssl->client_CA), x));
}

int
SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
{
        return (add_client_CA(&(ctx->client_CA), x));
}

static int
xname_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
{
        return (X509_NAME_cmp(*a, *b));
}

/*!
 * Load CA certs from a file into a ::STACK. Note that it is somewhat misnamed;
 * it doesn't really have anything to do with clients (except that a common use
 * for a stack of CAs is to send it to the client). Actually, it doesn't have
 * much to do with CAs, either, since it will load any old cert.
 * \param file the file containing one or more certs.
 * \return a ::STACK containing the certs.
 */
STACK_OF(X509_NAME) *
SSL_load_client_CA_file(const char *file)
{
        BIO *in;
        X509 *x = NULL;
        X509_NAME *xn = NULL;
        STACK_OF(X509_NAME) *ret = NULL, *sk;

        sk = sk_X509_NAME_new(xname_cmp);

        in = BIO_new(BIO_s_file_internal());

        if ((sk == NULL) || (in == NULL)) {
                SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
                goto err;
        }

        if (!BIO_read_filename(in, file))
                goto err;

        for (;;) {
                if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
                        break;
                if (ret == NULL) {
                        ret = sk_X509_NAME_new_null();
                        if (ret == NULL) {
                                SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE,
                                    ERR_R_MALLOC_FAILURE);
                                goto err;
                        }
                }
                if ((xn = X509_get_subject_name(x)) == NULL) goto err;
                        /* check for duplicates */
                xn = X509_NAME_dup(xn);
                if (xn == NULL)
                        goto err;
                if (sk_X509_NAME_find(sk, xn) >= 0)
                        X509_NAME_free(xn);
                else {
                        sk_X509_NAME_push(sk, xn);
                        sk_X509_NAME_push(ret, xn);
                }
        }

        if (0) {
err:
                if (ret != NULL)
                        sk_X509_NAME_pop_free(ret, X509_NAME_free);
                ret = NULL;
        }
        if (sk != NULL)
                sk_X509_NAME_free(sk);
        BIO_free(in);
        X509_free(x);
        if (ret != NULL)
                ERR_clear_error();
        return (ret);
}

/*!
 * Add a file of certs to a stack.
 * \param stack the stack to add to.
 * \param file the file to add from. All certs in this file that are not
 * already in the stack will be added.
 * \return 1 for success, 0 for failure. Note that in the case of failure some
 * certs may have been added to \c stack.
 */

int
SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
    const char *file)
{
        BIO *in;
        X509 *x = NULL;
        X509_NAME *xn = NULL;
        int ret = 1;
        int (*oldcmp)(const X509_NAME * const *a, const X509_NAME * const *b);

        oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_cmp);

        in = BIO_new(BIO_s_file_internal());

        if (in == NULL) {
                SSLerr(SSL_F_SSL_ADD_FILE_CERT_SUBJECTS_TO_STACK,
                    ERR_R_MALLOC_FAILURE);
                goto err;
        }

        if (!BIO_read_filename(in, file))
                goto err;

        for (;;) {
                if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
                        break;
                if ((xn = X509_get_subject_name(x)) == NULL) goto err;
                        xn = X509_NAME_dup(xn);
                if (xn == NULL)
                        goto err;
                if (sk_X509_NAME_find(stack, xn) >= 0)
                        X509_NAME_free(xn);
                else
                        sk_X509_NAME_push(stack, xn);
        }

        ERR_clear_error();

        if (0) {
err:
                ret = 0;
        }
        BIO_free(in);
        X509_free(x);

        (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);

        return ret;
}

/*!
 * Add a directory of certs to a stack.
 * \param stack the stack to append to.
 * \param dir the directory to append from. All files in this directory will be
 * examined as potential certs. Any that are acceptable to
 * SSL_add_dir_cert_subjects_to_stack() that are not already in the stack will
 * be included.
 * \return 1 for success, 0 for failure. Note that in the case of failure some
 * certs may have been added to \c stack.
 */

int
SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack, const char *dir)
{
        DIR *dirp = NULL;
        char *path = NULL;
        int ret = 0;

        dirp = opendir(dir);
        if (dirp) {
                struct dirent *dp;
                while ((dp = readdir(dirp)) != NULL) {
                        if (asprintf(&path, "%s/%s", dir, dp->d_name) != -1) {
                                ret = SSL_add_file_cert_subjects_to_stack(
                                    stack, path);
                                free(path);
                        }
                        if (!ret)
                                break;
                }
                (void) closedir(dirp);
        }
        if (!ret) {
                SYSerr(SYS_F_OPENDIR, errno);
                ERR_asprintf_error_data("opendir ('%s')", dir);
                SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, ERR_R_SYS_LIB);
        }
        return ret;
}