ts_conf.c

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/* crypto/ts/ts_conf.c */
/* Written by Zoltan Glozik ([email protected]) 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
 *    [email protected].
 *
 * 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
 * ([email protected]).  This product includes software written by Tim
 * Hudson ([email protected]).
 *
 */

#include <string.h>

#include <openssl/crypto.h>
#include "cryptlib.h"
#include <openssl/pem.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#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;
    }

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)
            {
            sk_X509_push(othercerts, xi->x509);
            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;
    }

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;
    }

/* 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;
    }

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;
    }

#ifndef OPENSSL_NO_ENGINE

int TS_CONF_set_crypto_device(CONF *conf, const char *section,
                  const char *device)
    {
    int ret = 0;
    
    if (!device)
        device = NCONF_get_string(conf, section,
                      ENV_CRYPTO_DEVICE);

    if (device && !TS_CONF_set_default_engine(device))
        {
        TS_CONF_invalid(section, ENV_CRYPTO_DEVICE);
        goto err;
        }
    ret = 1;
 err:
    return ret;
    }

int TS_CONF_set_default_engine(const char *name)
    {
    ENGINE *e = NULL;
    int ret = 0;

    /* Leave the default if builtin specified. */
    if (strcmp(name, "builtin") == 0) return 1;

    if (!(e = ENGINE_by_id(name))) goto err;
    /* Enable the use of the NCipher HSM for forked children. */
    if (strcmp(name, "chil") == 0) 
        ENGINE_ctrl(e, ENGINE_CTRL_CHIL_SET_FORKCHECK, 1, 0, 0);
    /* All the operations are going to be carried out by the engine. */
    if (!ENGINE_set_default(e, ENGINE_METHOD_ALL)) goto err;
    ret = 1;
 err:
    if (!ret)
        {
        TSerr(TS_F_TS_CONF_SET_DEFAULT_ENGINE, 
              TS_R_COULD_NOT_SET_ENGINE);
        ERR_add_error_data(2, "engine:", name);
        }
    if (e) ENGINE_free(e);
    return ret;
    }

#endif

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;
    }

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;
    }

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;
    }

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;
    }

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;
    }

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;
    }

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);

    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 = atoi(val->value);
            }
        else if (strcmp(val->name, ENV_VALUE_MILLISECS) == 0)
            {
            if (val->value) millis = atoi(val->value);
            }
        else if (strcmp(val->name, ENV_VALUE_MICROSECS) == 0)
            {
            if (val->value) micros = atoi(val->value);
            }
        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;
    }

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;
    if (digits < 0 || digits > TS_MAX_CLOCK_PRECISION_DIGITS)
        {
        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;
    }

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);
    }

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);
    }

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);
    }