/*
 * 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>

struct dbinfo {
    char *realm;
    char *dbname;
    char *mkey_file;
    struct dbinfo *next;
};

static char *config_file;       /* location of kdc config file */

static int require_preauth = -1; /* 1 == require preauth for all principals */
static char *max_request_str;   /* `max_request' as a string */

static int disable_des = -1;

static int builtin_hdb_flag;
static int help_flag;
static int version_flag;

static struct getarg_strings addresses_str;     /* addresses to listen on */

char *runas_string;
char *chroot_string;


static struct getargs args[] = {
    {
        "config-file",  'c',    arg_string,     &config_file,
        "location of config file",      "file"
    },
    {
        "require-preauth",      'p',    arg_negative_flag, &require_preauth,
        "don't require pa-data in as-reqs", NULL
    },
    {
        "max-request",  0,      arg_string, &max_request_str,
        "max size for a kdc-request", "size"
    },
    { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support",
         NULL },
    {   "ports",        'P',    arg_string, rk_UNCONST(&port_str),
        "ports to listen to", "portspec"
    },
#ifdef SUPPORT_DETACH
#if DETACH_IS_DEFAULT
    {
        "detach",       'D',      arg_negative_flag, &detach_from_console,
        "don't detach from console", NULL
    },
#else
    {
        "detach",       0 ,      arg_flag, &detach_from_console,
        "detach from console", NULL
    },
#endif
#endif
    {   "addresses",    0,      arg_strings, &addresses_str,
        "addresses to listen on", "list of addresses" },
    {   "disable-des",  0,      arg_flag, &disable_des,
        "disable DES", NULL },
    {   "builtin-hdb",  0,      arg_flag,   &builtin_hdb_flag,
        "list builtin hdb backends", NULL},
    {   "runas-user",   0,      arg_string, &runas_string,
        "run as this user when connected to network", NULL
    },
    {   "chroot",       0,      arg_string, &chroot_string,
        "chroot directory to run in", NULL
    },
    {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
    {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
};

static int num_args = sizeof(args) / sizeof(args[0]);

static void
usage(int ret)
{
    arg_printusage (args, num_args, NULL, "");
    exit (ret);
}

static void
add_one_address (krb5_context context, const char *str, int first)
{
    krb5_error_code ret;
    krb5_addresses tmp;

    ret = krb5_parse_address (context, str, &tmp);
    if (ret)
        krb5_err (context, 1, ret, "parse_address `%s'", str);
    if (first)
        krb5_copy_addresses(context, &tmp, &explicit_addresses);
    else
        krb5_append_addresses(context, &explicit_addresses, &tmp);
    krb5_free_addresses (context, &tmp);
}

krb5_kdc_configuration *
configure(krb5_context context, int argc, char **argv)
{
    krb5_kdc_configuration *config;
    krb5_error_code ret;
    int optidx = 0;
    const char *p;

    while(getarg(args, num_args, argc, argv, &optidx))
        warnx("error at argument `%s'", argv[optidx]);

    if(help_flag)
        usage (0);

    if (version_flag) {
        print_version(NULL);
        exit(0);
    }

    if (builtin_hdb_flag) {
        char *list;
        ret = hdb_list_builtin(context, &list);
        if (ret)
            krb5_err(context, 1, ret, "listing builtin hdb backends");
        printf("builtin hdb backends: %s\n", list);
        free(list);
        exit(0);
    }

    argc -= optidx;
    argv += optidx;

    if (argc != 0)
        usage(1);

    {
        char **files;

        if (config_file == NULL) {
            asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
            if (config_file == NULL)
                errx(1, "out of memory");
        }

        ret = krb5_prepend_config_files_default(config_file, &files);
        if (ret)
            krb5_err(context, 1, ret, "getting configuration files");

        ret = krb5_set_config_files(context, files);
        krb5_free_config_files(files);
        if(ret)
            krb5_err(context, 1, ret, "reading configuration files");
    }

    ret = krb5_kdc_get_config(context, &config);
    if (ret)
        krb5_err(context, 1, ret, "krb5_kdc_default_config");

    kdc_openlog(context, "kdc", config);

    ret = krb5_kdc_set_dbinfo(context, config);
    if (ret)
        krb5_err(context, 1, ret, "krb5_kdc_set_dbinfo");

    if(max_request_str)
        max_request_tcp = max_request_udp = parse_bytes(max_request_str, NULL);

    if(max_request_tcp == 0){
        p = krb5_config_get_string (context,
                                    NULL,
                                    "kdc",
                                    "max-request",
                                    NULL);
        if(p)
            max_request_tcp = max_request_udp = parse_bytes(p, NULL);
    }

    if(require_preauth != -1)
        config->require_preauth = require_preauth;

    if(port_str == NULL){
        p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
        if (p != NULL)
            port_str = strdup(p);
    }

    explicit_addresses.len = 0;

    if (addresses_str.num_strings) {
        int i;

        for (i = 0; i < addresses_str.num_strings; ++i)
            add_one_address (context, addresses_str.strings[i], i == 0);
        free_getarg_strings (&addresses_str);
    } else {
        char **foo = krb5_config_get_strings (context, NULL,
                                              "kdc", "addresses", NULL);

        if (foo != NULL) {
            add_one_address (context, *foo++, TRUE);
            while (*foo)
                add_one_address (context, *foo++, FALSE);
        }
    }

    if(enable_http == -1)
        enable_http = krb5_config_get_bool(context, NULL, "kdc",
                                           "enable-http", NULL);

    if(request_log == NULL)
        request_log = krb5_config_get_string(context, NULL,
                                             "kdc",
                                             "kdc-request-log",
                                             NULL);

    if (krb5_config_get_string(context, NULL, "kdc",
                               "enforce-transited-policy", NULL))
        krb5_errx(context, 1, "enforce-transited-policy deprecated, "
                  "use [kdc]transited-policy instead");

#ifdef SUPPORT_DETACH
    if(detach_from_console == -1)
        detach_from_console = krb5_config_get_bool_default(context, NULL,
                                                           DETACH_IS_DEFAULT,
                                                           "kdc",
                                                           "detach", NULL);
#endif /* SUPPORT_DETACH */

    if(max_request_tcp == 0)
        max_request_tcp = 64 * 1024;
    if(max_request_udp == 0)
        max_request_udp = 64 * 1024;

    if (port_str == NULL)
        port_str = "+";

    if(disable_des == -1)
        disable_des = krb5_config_get_bool_default(context, NULL,
                                                   FALSE,
                                                   "kdc",
                                                   "disable-des", NULL);
    if(disable_des) {
        krb5_enctype_disable(context, ETYPE_DES_CBC_CRC);
        krb5_enctype_disable(context, ETYPE_DES_CBC_MD4);
        krb5_enctype_disable(context, ETYPE_DES_CBC_MD5);
        krb5_enctype_disable(context, ETYPE_DES_CBC_NONE);
        krb5_enctype_disable(context, ETYPE_DES_CFB64_NONE);
        krb5_enctype_disable(context, ETYPE_DES_PCBC_NONE);
    }

    krb5_kdc_windc_init(context);

    krb5_kdc_pkinit_config(context, config);

    return config;
}