/*
 * Copyright (c) 1997-2004 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 "kadmin_locl.h"
#include "kadmin-commands.h"
#include <kadm5/private.h>

static kadm5_ret_t
create_random_entry(krb5_principal princ,
                    unsigned max_life,
                    unsigned max_rlife,
                    uint32_t attributes)
{
    kadm5_principal_ent_rec ent;
    kadm5_ret_t ret;
    int mask = 0;
    krb5_keyblock *keys;
    int n_keys, i;
    char *name;
    const char *password;
    char pwbuf[512];

    random_password(pwbuf, sizeof(pwbuf));
    password = pwbuf;

    ret = krb5_unparse_name(context, princ, &name);
    if (ret) {
        krb5_warn(context, ret, "failed to unparse principal name");
        return ret;
    }

    memset(&ent, 0, sizeof(ent));
    ent.principal = princ;
    mask |= KADM5_PRINCIPAL;
    if (max_life) {
        ent.max_life = max_life;
        mask |= KADM5_MAX_LIFE;
    }
    if (max_rlife) {
        ent.max_renewable_life = max_rlife;
        mask |= KADM5_MAX_RLIFE;
    }
    ent.attributes |= attributes | KRB5_KDB_DISALLOW_ALL_TIX;
    mask |= KADM5_ATTRIBUTES;

    /* Create the entry with a random password */
    ret = kadm5_create_principal(kadm_handle, &ent, mask, password);
    if(ret) {
        krb5_warn(context, ret, "create_random_entry(%s): randkey failed",
                  name);
        goto out;
    }

    /* Replace the string2key based keys with real random bytes */
    ret = kadm5_randkey_principal(kadm_handle, princ, &keys, &n_keys);
    if(ret) {
        krb5_warn(context, ret, "create_random_entry(%s): randkey failed",
                  name);
        goto out;
    }
    for(i = 0; i < n_keys; i++)
        krb5_free_keyblock_contents(context, &keys[i]);
    free(keys);
    ret = kadm5_get_principal(kadm_handle, princ, &ent,
                              KADM5_PRINCIPAL | KADM5_ATTRIBUTES);
    if(ret) {
        krb5_warn(context, ret, "create_random_entry(%s): "
                  "unable to get principal", name);
        goto out;
    }
    ent.attributes &= (~KRB5_KDB_DISALLOW_ALL_TIX);
    ent.kvno = 1;
    ret = kadm5_modify_principal(kadm_handle, &ent,
                                 KADM5_ATTRIBUTES|KADM5_KVNO);
    kadm5_free_principal_ent (kadm_handle, &ent);
    if(ret) {
        krb5_warn(context, ret, "create_random_entry(%s): "
                  "unable to modify principal", name);
        goto out;
    }
 out:
    free(name);
    return ret;
}

extern int local_flag;

int
init(struct init_options *opt, int argc, char **argv)
{
    kadm5_ret_t ret;
    int i;
    HDB *db;
    krb5_deltat max_life = 0, max_rlife = 0;

    if (!local_flag) {
        krb5_warnx(context, "init is only available in local (-l) mode");
        return 0;
    }

    if (opt->realm_max_ticket_life_string) {
        if (str2deltat (opt->realm_max_ticket_life_string, &max_life) != 0) {
            krb5_warnx (context, "unable to parse \"%s\"",
                        opt->realm_max_ticket_life_string);
            return 0;
        }
    }
    if (opt->realm_max_renewable_life_string) {
        if (str2deltat (opt->realm_max_renewable_life_string, &max_rlife) != 0) {
            krb5_warnx (context, "unable to parse \"%s\"",
                        opt->realm_max_renewable_life_string);
            return 0;
        }
    }

    db = _kadm5_s_get_db(kadm_handle);

    ret = db->hdb_open(context, db, O_RDWR | O_CREAT, 0600);
    if(ret){
        krb5_warn(context, ret, "hdb_open");
        return 0;
    }
    db->hdb_close(context, db);
    for(i = 0; i < argc; i++){
        krb5_principal princ;
        const char *realm = argv[i];

        if (opt->realm_max_ticket_life_string == NULL) {
            max_life = 0;
            if(edit_deltat ("Realm max ticket life", &max_life, NULL, 0)) {
                return 0;
            }
        }
        if (opt->realm_max_renewable_life_string == NULL) {
            max_rlife = 0;
            if(edit_deltat("Realm max renewable ticket life", &max_rlife,
                           NULL, 0)) {
                return 0;
            }
        }

        /* Create `krbtgt/REALM' */
        ret = krb5_make_principal(context, &princ, realm,
                                  KRB5_TGS_NAME, realm, NULL);
        if(ret)
            return 0;

        create_random_entry(princ, max_life, max_rlife, 0);
        krb5_free_principal(context, princ);

        if (opt->bare_flag)
            continue;

        /* Create `kadmin/changepw' */
        krb5_make_principal(context, &princ, realm,
                            "kadmin", "changepw", NULL);
        /*
         * The Windows XP (at least) password changing protocol
         * request the `kadmin/changepw' ticket with `renewable_ok,
         * renewable, forwardable' and so fails if we disallow
         * forwardable here.
         */
        create_random_entry(princ, 5*60, 5*60,
                            KRB5_KDB_DISALLOW_TGT_BASED|
                            KRB5_KDB_PWCHANGE_SERVICE|
                            KRB5_KDB_DISALLOW_POSTDATED|
                            KRB5_KDB_DISALLOW_RENEWABLE|
                            KRB5_KDB_DISALLOW_PROXIABLE|
                            KRB5_KDB_REQUIRES_PRE_AUTH);
        krb5_free_principal(context, princ);

        /* Create `kadmin/admin' */
        krb5_make_principal(context, &princ, realm,
                            "kadmin", "admin", NULL);
        create_random_entry(princ, 60*60, 60*60, KRB5_KDB_REQUIRES_PRE_AUTH);
        krb5_free_principal(context, princ);

        /* Create `changepw/kerberos' (for v4 compat) */
        krb5_make_principal(context, &princ, realm,
                            "changepw", "kerberos", NULL);
        create_random_entry(princ, 60*60, 60*60,
                            KRB5_KDB_DISALLOW_TGT_BASED|
                            KRB5_KDB_PWCHANGE_SERVICE);

        krb5_free_principal(context, princ);

        /* Create `kadmin/hprop' for database propagation */
        krb5_make_principal(context, &princ, realm,
                            "kadmin", "hprop", NULL);
        create_random_entry(princ, 60*60, 60*60,
                            KRB5_KDB_REQUIRES_PRE_AUTH|
                            KRB5_KDB_DISALLOW_TGT_BASED);
        krb5_free_principal(context, princ);

        /* Create `WELLKNOWN/ANONYMOUS' for anonymous as-req */
        krb5_make_principal(context, &princ, realm,
                            KRB5_WELLKNOWN_NAME, KRB5_ANON_NAME, NULL);
        create_random_entry(princ, 60*60, 60*60,
                            KRB5_KDB_REQUIRES_PRE_AUTH);
        krb5_free_principal(context, princ);


        /* Create `default' */
        {
            kadm5_principal_ent_rec ent;
            int mask = 0;

            memset (&ent, 0, sizeof(ent));
            mask |= KADM5_PRINCIPAL;
            krb5_make_principal(context, &ent.principal, realm,
                                "default", NULL);
            mask |= KADM5_MAX_LIFE;
            ent.max_life = 24 * 60 * 60;
            mask |= KADM5_MAX_RLIFE;
            ent.max_renewable_life = 7 * ent.max_life;
            ent.attributes = KRB5_KDB_DISALLOW_ALL_TIX;
            mask |= KADM5_ATTRIBUTES;

            ret = kadm5_create_principal(kadm_handle, &ent, mask, "");
            if (ret)
                krb5_err (context, 1, ret, "kadm5_create_principal");

            krb5_free_principal(context, ent.principal);
        }
    }
    return 0;
}