/*
 * Copyright (c) 1997-2007 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Portions Copyright (c) 2009 Apple Inc. 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. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.
 */

#include "kdc_locl.h"
#include <getarg.h>
#include <parse_bytes.h>

krb5_error_code
krb5_kdc_get_config(krb5_context context, krb5_kdc_configuration **config)
{
    krb5_kdc_configuration *c;

    c = calloc(1, sizeof(*c));
    if (c == NULL) {
        krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
        return ENOMEM;
    }

    c->require_preauth = TRUE;
    c->kdc_warn_pwexpire = 0;
    c->encode_as_rep_as_tgs_rep = FALSE;
    c->tgt_use_strongest_session_key = FALSE;
    c->preauth_use_strongest_session_key = FALSE;
    c->svc_use_strongest_session_key = FALSE;
    c->use_strongest_server_key = TRUE;
    c->check_ticket_addresses = TRUE;
    c->allow_null_ticket_addresses = TRUE;
    c->allow_anonymous = FALSE;
    c->trpolicy = TRPOLICY_ALWAYS_CHECK;
    c->enable_pkinit = FALSE;
    c->pkinit_princ_in_cert = TRUE;
    c->pkinit_require_binding = TRUE;
    c->db = NULL;
    c->num_db = 0;
    c->logf = NULL;

    c->require_preauth =
        krb5_config_get_bool_default(context, NULL,
                                     c->require_preauth,
                                     "kdc", "require-preauth", NULL);
#ifdef DIGEST
    c->enable_digest =
        krb5_config_get_bool_default(context, NULL,
                                     FALSE,
                                     "kdc", "enable-digest", NULL);

    {
        const char *digests;

        digests = krb5_config_get_string(context, NULL,
                                         "kdc",
                                         "digests_allowed", NULL);
        if (digests == NULL)
            digests = "ntlm-v2";
        c->digests_allowed = parse_flags(digests,_kdc_digestunits, 0);
        if (c->digests_allowed == -1) {
            kdc_log(context, c, 0,
                    "unparsable digest units (%s), turning off digest",
                    digests);
            c->enable_digest = 0;
        } else if (c->digests_allowed == 0) {
            kdc_log(context, c, 0,
                    "no digest enable, turning digest off",
                    digests);
            c->enable_digest = 0;
        }
    }
#endif

#ifdef KX509
    c->enable_kx509 =
        krb5_config_get_bool_default(context, NULL,
                                     FALSE,
                                     "kdc", "enable-kx509", NULL);

    if (c->enable_kx509) {
        c->kx509_template =
            krb5_config_get_string(context, NULL,
                                   "kdc", "kx509_template", NULL);
        c->kx509_ca =
            krb5_config_get_string(context, NULL,
                                   "kdc", "kx509_ca", NULL);
        if (c->kx509_ca == NULL || c->kx509_template == NULL) {
            kdc_log(context, c, 0,
                    "missing kx509 configuration, turning off");
            c->enable_kx509 = FALSE;
        }
    }
#endif

    c->tgt_use_strongest_session_key =
        krb5_config_get_bool_default(context, NULL,
                                     c->tgt_use_strongest_session_key,
                                     "kdc",
                                     "tgt-use-strongest-session-key", NULL);
    c->preauth_use_strongest_session_key =
        krb5_config_get_bool_default(context, NULL,
                                     c->preauth_use_strongest_session_key,
                                     "kdc",
                                     "preauth-use-strongest-session-key", NULL);
    c->svc_use_strongest_session_key =
        krb5_config_get_bool_default(context, NULL,
                                     c->svc_use_strongest_session_key,
                                     "kdc",
                                     "svc-use-strongest-session-key", NULL);
    c->use_strongest_server_key =
        krb5_config_get_bool_default(context, NULL,
                                     c->use_strongest_server_key,
                                     "kdc",
                                     "use-strongest-server-key", NULL);

    c->check_ticket_addresses =
        krb5_config_get_bool_default(context, NULL,
                                     c->check_ticket_addresses,
                                     "kdc",
                                     "check-ticket-addresses", NULL);
    c->allow_null_ticket_addresses =
        krb5_config_get_bool_default(context, NULL,
                                     c->allow_null_ticket_addresses,
                                     "kdc",
                                     "allow-null-ticket-addresses", NULL);

    c->allow_anonymous =
        krb5_config_get_bool_default(context, NULL,
                                     c->allow_anonymous,
                                     "kdc",
                                     "allow-anonymous", NULL);

    c->max_datagram_reply_length =
        krb5_config_get_int_default(context,
                                    NULL,
                                    1400,
                                    "kdc",
                                    "max-kdc-datagram-reply-length",
                                    NULL);

    {
        const char *trpolicy_str;

        trpolicy_str =
            krb5_config_get_string_default(context, NULL, "DEFAULT", "kdc",
                                           "transited-policy", NULL);
        if(strcasecmp(trpolicy_str, "always-check") == 0) {
            c->trpolicy = TRPOLICY_ALWAYS_CHECK;
        } else if(strcasecmp(trpolicy_str, "allow-per-principal") == 0) {
            c->trpolicy = TRPOLICY_ALLOW_PER_PRINCIPAL;
        } else if(strcasecmp(trpolicy_str, "always-honour-request") == 0) {
            c->trpolicy = TRPOLICY_ALWAYS_HONOUR_REQUEST;
        } else if(strcasecmp(trpolicy_str, "DEFAULT") == 0) {
            /* default */
        } else {
            kdc_log(context, c, 0,
                    "unknown transited-policy: %s, "
                    "reverting to default (always-check)",
                    trpolicy_str);
        }
    }

    c->encode_as_rep_as_tgs_rep =
        krb5_config_get_bool_default(context, NULL,
                                     c->encode_as_rep_as_tgs_rep,
                                     "kdc",
                                     "encode_as_rep_as_tgs_rep", NULL);

    c->kdc_warn_pwexpire =
        krb5_config_get_time_default (context, NULL,
                                      c->kdc_warn_pwexpire,
                                      "kdc", "kdc_warn_pwexpire", NULL);


    c->enable_pkinit =
        krb5_config_get_bool_default(context,
                                     NULL,
                                     c->enable_pkinit,
                                     "kdc",
                                     "enable-pkinit",
                                     NULL);


    c->pkinit_kdc_identity =
        krb5_config_get_string(context, NULL,
                               "kdc", "pkinit_identity", NULL);
    c->pkinit_kdc_anchors =
        krb5_config_get_string(context, NULL,
                               "kdc", "pkinit_anchors", NULL);
    c->pkinit_kdc_cert_pool =
        krb5_config_get_strings(context, NULL,
                                "kdc", "pkinit_pool", NULL);
    c->pkinit_kdc_revoke =
        krb5_config_get_strings(context, NULL,
                                "kdc", "pkinit_revoke", NULL);
    c->pkinit_kdc_ocsp_file =
        krb5_config_get_string(context, NULL,
                               "kdc", "pkinit_kdc_ocsp", NULL);
    c->pkinit_kdc_friendly_name =
        krb5_config_get_string(context, NULL,
                               "kdc", "pkinit_kdc_friendly_name", NULL);
    c->pkinit_princ_in_cert =
        krb5_config_get_bool_default(context, NULL,
                                     c->pkinit_princ_in_cert,
                                     "kdc",
                                     "pkinit_principal_in_certificate",
                                     NULL);
    c->pkinit_require_binding =
        krb5_config_get_bool_default(context, NULL,
                                     c->pkinit_require_binding,
                                     "kdc",
                                     "pkinit_win2k_require_binding",
                                     NULL);
    c->pkinit_dh_min_bits =
        krb5_config_get_int_default(context, NULL,
                                    0,
                                    "kdc", "pkinit_dh_min_bits", NULL);

    *config = c;

    return 0;
}

krb5_error_code
krb5_kdc_pkinit_config(krb5_context context, krb5_kdc_configuration *config)
{
#ifdef PKINIT
#ifdef __APPLE__
    config->enable_pkinit = 1;

    if (config->pkinit_kdc_identity == NULL) {
        if (config->pkinit_kdc_friendly_name == NULL)
            config->pkinit_kdc_friendly_name =
                strdup("O=System Identity,CN=com.apple.kerberos.kdc");
        config->pkinit_kdc_identity = strdup("KEYCHAIN:");
    }
    if (config->pkinit_kdc_anchors == NULL)
        config->pkinit_kdc_anchors = strdup("KEYCHAIN:");

#endif /* __APPLE__ */

    if (config->enable_pkinit) {
        if (config->pkinit_kdc_identity == NULL)
            krb5_errx(context, 1, "pkinit enabled but no identity");

        if (config->pkinit_kdc_anchors == NULL)
            krb5_errx(context, 1, "pkinit enabled but no X509 anchors");

        krb5_kdc_pk_initialize(context, config,
                               config->pkinit_kdc_identity,
                               config->pkinit_kdc_anchors,
                               config->pkinit_kdc_cert_pool,
                               config->pkinit_kdc_revoke);

    }

    return 0;
#endif /* PKINIT */
}