/* $OpenBSD: ts_conf.c,v 1.16 2025/05/10 05:54:39 tb Exp $ */
/* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL
 * project 2002.
 */
/* ====================================================================
 * Copyright (c) 2006 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 <limits.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/opensslconf.h>

#include <openssl/crypto.h>
#include <openssl/pem.h>
#include <openssl/ts.h>

/* Macro definitions for the configuration file. */

#define BASE_SECTION                    "tsa"
#define ENV_DEFAULT_TSA                 "default_tsa"
#define ENV_SERIAL                      "serial"
#define ENV_CRYPTO_DEVICE               "crypto_device"
#define ENV_SIGNER_CERT                 "signer_cert"
#define ENV_CERTS                       "certs"
#define ENV_SIGNER_KEY                  "signer_key"
#define ENV_DEFAULT_POLICY              "default_policy"
#define ENV_OTHER_POLICIES              "other_policies"
#define ENV_DIGESTS                     "digests"
#define ENV_ACCURACY                    "accuracy"
#define ENV_ORDERING                    "ordering"
#define ENV_TSA_NAME                    "tsa_name"
#define ENV_ESS_CERT_ID_CHAIN           "ess_cert_id_chain"
#define ENV_VALUE_SECS                  "secs"
#define ENV_VALUE_MILLISECS             "millisecs"
#define ENV_VALUE_MICROSECS             "microsecs"
#define ENV_CLOCK_PRECISION_DIGITS      "clock_precision_digits"
#define ENV_VALUE_YES                   "yes"
#define ENV_VALUE_NO                    "no"

/* Function definitions for certificate and key loading. */

X509 *
TS_CONF_load_cert(const char *file)
{
        BIO *cert = NULL;
        X509 *x = NULL;

        if ((cert = BIO_new_file(file, "r")) == NULL)
                goto end;
        x = PEM_read_bio_X509_AUX(cert, NULL, NULL, NULL);

end:
        if (x == NULL)
                fprintf(stderr, "unable to load certificate: %s\n", file);
        BIO_free(cert);
        return x;
}
LCRYPTO_ALIAS(TS_CONF_load_cert);

STACK_OF(X509) *
TS_CONF_load_certs(const char *file)
{
        BIO *certs = NULL;
        STACK_OF(X509) *othercerts = NULL;
        STACK_OF(X509_INFO) *allcerts = NULL;
        int i;

        if (!(certs = BIO_new_file(file, "r")))
                goto end;

        if (!(othercerts = sk_X509_new_null()))
                goto end;
        allcerts = PEM_X509_INFO_read_bio(certs, NULL, NULL, NULL);
        for (i = 0; i < sk_X509_INFO_num(allcerts); i++) {
                X509_INFO *xi = sk_X509_INFO_value(allcerts, i);
                if (xi->x509) {
                        if (sk_X509_push(othercerts, xi->x509) == 0) {
                                sk_X509_pop_free(othercerts, X509_free);
                                othercerts = NULL;
                                goto end;
                        }
                        xi->x509 = NULL;
                }
        }

end:
        if (othercerts == NULL)
                fprintf(stderr, "unable to load certificates: %s\n", file);
        sk_X509_INFO_pop_free(allcerts, X509_INFO_free);
        BIO_free(certs);
        return othercerts;
}
LCRYPTO_ALIAS(TS_CONF_load_certs);

EVP_PKEY *
TS_CONF_load_key(const char *file, const char *pass)
{
        BIO *key = NULL;
        EVP_PKEY *pkey = NULL;

        if (!(key = BIO_new_file(file, "r")))
                goto end;
        pkey = PEM_read_bio_PrivateKey(key, NULL, NULL, (char *) pass);

end:
        if (pkey == NULL)
                fprintf(stderr, "unable to load private key: %s\n", file);
        BIO_free(key);
        return pkey;
}
LCRYPTO_ALIAS(TS_CONF_load_key);

/* Function definitions for handling configuration options. */

static void
TS_CONF_lookup_fail(const char *name, const char *tag)
{
        fprintf(stderr, "variable lookup failed for %s::%s\n", name, tag);
}

static void
TS_CONF_invalid(const char *name, const char *tag)
{
        fprintf(stderr, "invalid variable value for %s::%s\n", name, tag);
}

const char *
TS_CONF_get_tsa_section(CONF *conf, const char *section)
{
        if (!section) {
                section = NCONF_get_string(conf, BASE_SECTION, ENV_DEFAULT_TSA);
                if (!section)
                        TS_CONF_lookup_fail(BASE_SECTION, ENV_DEFAULT_TSA);
        }
        return section;
}
LCRYPTO_ALIAS(TS_CONF_get_tsa_section);

int
TS_CONF_set_serial(CONF *conf, const char *section, TS_serial_cb cb,
    TS_RESP_CTX *ctx)
{
        int ret = 0;
        char *serial = NCONF_get_string(conf, section, ENV_SERIAL);

        if (!serial) {
                TS_CONF_lookup_fail(section, ENV_SERIAL);
                goto err;
        }
        TS_RESP_CTX_set_serial_cb(ctx, cb, serial);

        ret = 1;

err:
        return ret;
}
LCRYPTO_ALIAS(TS_CONF_set_serial);

int
TS_CONF_set_signer_cert(CONF *conf, const char *section, const char *cert,
    TS_RESP_CTX *ctx)
{
        int ret = 0;
        X509 *cert_obj = NULL;

        if (!cert)
                cert = NCONF_get_string(conf, section, ENV_SIGNER_CERT);
        if (!cert) {
                TS_CONF_lookup_fail(section, ENV_SIGNER_CERT);
                goto err;
        }
        if (!(cert_obj = TS_CONF_load_cert(cert)))
                goto err;
        if (!TS_RESP_CTX_set_signer_cert(ctx, cert_obj))
                goto err;

        ret = 1;

err:
        X509_free(cert_obj);
        return ret;
}
LCRYPTO_ALIAS(TS_CONF_set_signer_cert);

int
TS_CONF_set_certs(CONF *conf, const char *section, const char *certs,
    TS_RESP_CTX *ctx)
{
        int ret = 0;
        STACK_OF(X509) *certs_obj = NULL;

        if (!certs)
                certs = NCONF_get_string(conf, section, ENV_CERTS);
        /* Certificate chain is optional. */
        if (!certs)
                goto end;
        if (!(certs_obj = TS_CONF_load_certs(certs)))
                goto err;
        if (!TS_RESP_CTX_set_certs(ctx, certs_obj))
                goto err;

end:
        ret = 1;
err:
        sk_X509_pop_free(certs_obj, X509_free);
        return ret;
}
LCRYPTO_ALIAS(TS_CONF_set_certs);

int
TS_CONF_set_signer_key(CONF *conf, const char *section, const char *key,
    const char *pass, TS_RESP_CTX *ctx)
{
        int ret = 0;
        EVP_PKEY *key_obj = NULL;

        if (!key)
                key = NCONF_get_string(conf, section, ENV_SIGNER_KEY);
        if (!key) {
                TS_CONF_lookup_fail(section, ENV_SIGNER_KEY);
                goto err;
        }
        if (!(key_obj = TS_CONF_load_key(key, pass)))
                goto err;
        if (!TS_RESP_CTX_set_signer_key(ctx, key_obj))
                goto err;

        ret = 1;

err:
        EVP_PKEY_free(key_obj);
        return ret;
}
LCRYPTO_ALIAS(TS_CONF_set_signer_key);

int
TS_CONF_set_def_policy(CONF *conf, const char *section, const char *policy,
    TS_RESP_CTX *ctx)
{
        int ret = 0;
        ASN1_OBJECT *policy_obj = NULL;

        if (!policy)
                policy = NCONF_get_string(conf, section, ENV_DEFAULT_POLICY);
        if (!policy) {
                TS_CONF_lookup_fail(section, ENV_DEFAULT_POLICY);
                goto err;
        }
        if (!(policy_obj = OBJ_txt2obj(policy, 0))) {
                TS_CONF_invalid(section, ENV_DEFAULT_POLICY);
                goto err;
        }
        if (!TS_RESP_CTX_set_def_policy(ctx, policy_obj))
                goto err;

        ret = 1;

err:
        ASN1_OBJECT_free(policy_obj);
        return ret;
}
LCRYPTO_ALIAS(TS_CONF_set_def_policy);

int
TS_CONF_set_policies(CONF *conf, const char *section, TS_RESP_CTX *ctx)
{
        int ret = 0;
        int i;
        STACK_OF(CONF_VALUE) *list = NULL;
        char *policies = NCONF_get_string(conf, section, ENV_OTHER_POLICIES);

        /* If no other policy is specified, that's fine. */
        if (policies && !(list = X509V3_parse_list(policies))) {
                TS_CONF_invalid(section, ENV_OTHER_POLICIES);
                goto err;
        }
        for (i = 0; i < sk_CONF_VALUE_num(list); ++i) {
                CONF_VALUE *val = sk_CONF_VALUE_value(list, i);
                const char *extval = val->value ? val->value : val->name;
                ASN1_OBJECT *objtmp;
                if (!(objtmp = OBJ_txt2obj(extval, 0))) {
                        TS_CONF_invalid(section, ENV_OTHER_POLICIES);
                        goto err;
                }
                if (!TS_RESP_CTX_add_policy(ctx, objtmp))
                        goto err;
                ASN1_OBJECT_free(objtmp);
        }

        ret = 1;

err:
        sk_CONF_VALUE_pop_free(list, X509V3_conf_free);
        return ret;
}
LCRYPTO_ALIAS(TS_CONF_set_policies);

int
TS_CONF_set_digests(CONF *conf, const char *section, TS_RESP_CTX *ctx)
{
        int ret = 0;
        int i;
        STACK_OF(CONF_VALUE) *list = NULL;
        char *digests = NCONF_get_string(conf, section, ENV_DIGESTS);

        if (!digests) {
                TS_CONF_lookup_fail(section, ENV_DIGESTS);
                goto err;
        }
        if (!(list = X509V3_parse_list(digests))) {
                TS_CONF_invalid(section, ENV_DIGESTS);
                goto err;
        }
        if (sk_CONF_VALUE_num(list) == 0) {
                TS_CONF_invalid(section, ENV_DIGESTS);
                goto err;
        }
        for (i = 0; i < sk_CONF_VALUE_num(list); ++i) {
                CONF_VALUE *val = sk_CONF_VALUE_value(list, i);
                const char *extval = val->value ? val->value : val->name;
                const EVP_MD *md;
                if (!(md = EVP_get_digestbyname(extval))) {
                        TS_CONF_invalid(section, ENV_DIGESTS);
                        goto err;
                }
                if (!TS_RESP_CTX_add_md(ctx, md))
                        goto err;
        }

        ret = 1;

err:
        sk_CONF_VALUE_pop_free(list, X509V3_conf_free);
        return ret;
}
LCRYPTO_ALIAS(TS_CONF_set_digests);

int
TS_CONF_set_accuracy(CONF *conf, const char *section, TS_RESP_CTX *ctx)
{
        int ret = 0;
        int i;
        int secs = 0, millis = 0, micros = 0;
        STACK_OF(CONF_VALUE) *list = NULL;
        char *accuracy = NCONF_get_string(conf, section, ENV_ACCURACY);
        const char *errstr;

        if (accuracy && !(list = X509V3_parse_list(accuracy))) {
                TS_CONF_invalid(section, ENV_ACCURACY);
                goto err;
        }
        for (i = 0; i < sk_CONF_VALUE_num(list); ++i) {
                CONF_VALUE *val = sk_CONF_VALUE_value(list, i);
                if (strcmp(val->name, ENV_VALUE_SECS) == 0) {
                        if (val->value) {
                                secs = strtonum(val->value, 0, INT_MAX,
                                    &errstr);
                                if (errstr != NULL) {
                                        TS_CONF_invalid(section,
                                            ENV_VALUE_SECS);
                                        goto err;
                                }
                        }
                } else if (strcmp(val->name, ENV_VALUE_MILLISECS) == 0) {
                        if (val->value) {
                                millis = strtonum(val->value, 1, 999, &errstr);
                                if (errstr != NULL) {
                                        TS_CONF_invalid(section,
                                            ENV_VALUE_MILLISECS);
                                        goto err;
                                }
                        }
                } else if (strcmp(val->name, ENV_VALUE_MICROSECS) == 0) {
                        if (val->value) {
                                micros = strtonum(val->value, 1, 999, &errstr);
                                if (errstr != NULL) {
                                        TS_CONF_invalid(section,
                                            ENV_VALUE_MICROSECS);
                                        goto err;
                                }
                        }
                } else {
                        TS_CONF_invalid(section, ENV_ACCURACY);
                        goto err;
                }
        }
        if (!TS_RESP_CTX_set_accuracy(ctx, secs, millis, micros))
                goto err;

        ret = 1;

err:
        sk_CONF_VALUE_pop_free(list, X509V3_conf_free);
        return ret;
}
LCRYPTO_ALIAS(TS_CONF_set_accuracy);

int
TS_CONF_set_clock_precision_digits(CONF *conf, const char *section,
    TS_RESP_CTX *ctx)
{
        int ret = 0;
        long digits = 0;

        /* If not specified, set the default value to 0, i.e. sec  precision */
        if (!NCONF_get_number_e(conf, section, ENV_CLOCK_PRECISION_DIGITS,
            &digits))
                digits = 0;
        /* We only support second precision, so reject everything else */
        if (digits != 0) {
                TS_CONF_invalid(section, ENV_CLOCK_PRECISION_DIGITS);
                goto err;
        }

        if (!TS_RESP_CTX_set_clock_precision_digits(ctx, digits))
                goto err;

        return 1;

err:
        return ret;
}
LCRYPTO_ALIAS(TS_CONF_set_clock_precision_digits);

static int
TS_CONF_add_flag(CONF *conf, const char *section, const char *field, int flag,
    TS_RESP_CTX *ctx)
{
        /* Default is false. */
        const char *value = NCONF_get_string(conf, section, field);

        if (value) {
                if (strcmp(value, ENV_VALUE_YES) == 0)
                        TS_RESP_CTX_add_flags(ctx, flag);
                else if (strcmp(value, ENV_VALUE_NO) != 0) {
                        TS_CONF_invalid(section, field);
                        return 0;
                }
        }

        return 1;
}

int
TS_CONF_set_ordering(CONF *conf, const char *section, TS_RESP_CTX *ctx)
{
        return TS_CONF_add_flag(conf, section, ENV_ORDERING, TS_ORDERING, ctx);
}
LCRYPTO_ALIAS(TS_CONF_set_ordering);

int
TS_CONF_set_tsa_name(CONF *conf, const char *section, TS_RESP_CTX *ctx)
{
        return TS_CONF_add_flag(conf, section, ENV_TSA_NAME, TS_TSA_NAME, ctx);
}
LCRYPTO_ALIAS(TS_CONF_set_tsa_name);

int
TS_CONF_set_ess_cert_id_chain(CONF *conf, const char *section, TS_RESP_CTX *ctx)
{
        return TS_CONF_add_flag(conf, section, ENV_ESS_CERT_ID_CHAIN,
            TS_ESS_CERT_ID_CHAIN, ctx);
}
LCRYPTO_ALIAS(TS_CONF_set_ess_cert_id_chain);