/*
 * admin/create/kdb5_create.c
 *
 * Copyright 1990,1991 by the Massachusetts Institute of Technology.
 * All Rights Reserved.
 *
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 * 
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 * 
 *
 * Generate (from scratch) a Kerberos KDC database.
 */

#include "k5-int.h"
#include "com_err.h"
#include <stdio.h>

enum ap_op {
    NULL_KEY,				/* setup null keys */
    MASTER_KEY,				/* use master key as new key */
    RANDOM_KEY				/* choose a random key */
};

struct realm_info {
    krb5_deltat max_life;
    krb5_deltat max_rlife;
    krb5_timestamp expiration;
    krb5_flags flags;
    krb5_encrypt_block *eblock;
    krb5_pointer rseed;
} rblock = { /* XXX */
    KRB5_KDB_MAX_LIFE,
    KRB5_KDB_MAX_RLIFE,
    KRB5_KDB_EXPIRATION,
    KRB5_KDB_DEF_FLAGS,
    0
};

static krb5_error_code add_principal 
	PROTOTYPE((krb5_context,
		   krb5_principal, 
		   enum ap_op,
		   struct realm_info *));

/*
 * Steps in creating a database:
 *
 * 1) use the db calls to open/create a new database
 *
 * 2) get a realm name for the new db
 *
 * 3) get a master password for the new db; convert to an encryption key.
 *
 * 4) create various required entries in the database
 *
 * 5) close & exit
 */

static void
usage(who, status)
char *who;
int status;
{
    fprintf(stderr, "usage: %s [-d dbpathname] [-r realmname] [-k keytype]\n\
\t[-e etype] [-M mkeyname]\n",
	    who);
    exit(status);
}

krb5_keyblock master_keyblock;
krb5_principal master_princ;
krb5_encrypt_block master_encblock;

krb5_data tgt_princ_entries[] = {
	{0, KRB5_TGS_NAME_SIZE, KRB5_TGS_NAME},
	{0, 0, 0} };

krb5_data db_creator_entries[] = {
	{0, sizeof("db_creation")-1, "db_creation"} };

/* XXX knows about contents of krb5_principal, and that tgt names
 are of form TGT/REALM@REALM */
krb5_principal_data tgt_princ = {
        0,					/* magic number */
	{0, 0, 0},				/* krb5_data realm */
	tgt_princ_entries,			/* krb5_data *data */
	2,					/* int length */
	KRB5_NT_SRV_INST			/* int type */
};

krb5_principal_data db_create_princ = {
        0,					/* magic number */
	{0, 0, 0},				/* krb5_data realm */
	db_creator_entries,			/* krb5_data *data */
	1,					/* int length */
	KRB5_NT_SRV_INST			/* int type */
};

void
main(argc, argv)
int argc;
char *argv[];
{
    extern char *optarg;	
    int optchar;

    krb5_error_code retval;
    char *dbname = DEFAULT_KDB_FILE;
    char *realm = 0;
    char *mkey_name = 0;
    char *mkey_fullname;
    char *defrealm;
    char *mkey_password = 0;
    int keytypedone = 0;
    krb5_enctype etype = 0xffff;
    krb5_data scratch, pwd;
    krb5_context context;

    krb5_init_context(&context);
    krb5_init_ets(context);

    if (strrchr(argv[0], '/'))
	argv[0] = strrchr(argv[0], '/')+1;

    while ((optchar = getopt(argc, argv, "d:r:k:M:e:P:")) != EOF) {
	switch(optchar) {
	case 'd':			/* set db name */
	    dbname = optarg;
	    break;
	case 'r':
	    realm = optarg;
	    break;
	case 'k':
	    master_keyblock.keytype = atoi(optarg);
	    keytypedone++;
	    break;
	case 'M':			/* master key name in DB */
	    mkey_name = optarg;
	    break;
        case 'P':		/* Only used for testing!!! */
	    mkey_password = optarg;
	    break;
	case 'e':
	    etype = atoi(optarg);
	    break;
	case '?':
	default:
	    usage(argv[0], 1);
	    /*NOTREACHED*/
	}
    }

    if (!keytypedone)
	master_keyblock.keytype = DEFAULT_KDC_KEYTYPE;

    if (!valid_keytype(master_keyblock.keytype)) {
	com_err(argv[0], KRB5_PROG_KEYTYPE_NOSUPP,
		"while setting up keytype %d", master_keyblock.keytype);
	exit(1);
    }

    if (etype == 0xffff)
	etype = DEFAULT_KDC_ETYPE;

    if (!valid_etype(etype)) {
	com_err(argv[0], KRB5_PROG_ETYPE_NOSUPP,
		"while setting up etype %d", etype);
	exit(1);
    }
    krb5_use_cstype(context, &master_encblock, etype);

    retval = krb5_db_set_name(context, dbname);
    if (!retval) retval = EEXIST;

    if (retval == EEXIST || retval == EACCES || retval == EPERM) {
	/* it exists ! */
	com_err(argv[0], 0, "The database '%s' appears to already exist",
		dbname);
	exit(1);
    }
    if (!realm) {
	if (retval = krb5_get_default_realm(context, &defrealm)) {
	    com_err(argv[0], retval, "while retrieving default realm name");
	    exit(1);
	}	    
	realm = defrealm;
    }

    /* assemble & parse the master key name */

    if (retval = krb5_db_setup_mkey_name(context, mkey_name, realm, 
					 &mkey_fullname, &master_princ)) {
	com_err(argv[0], retval, "while setting up master key name");
	exit(1);
    }

    krb5_princ_set_realm_data(context, &db_create_princ, realm);
    krb5_princ_set_realm_length(context, &db_create_princ, strlen(realm));
    krb5_princ_set_realm_data(context, &tgt_princ, realm);
    krb5_princ_set_realm_length(context, &tgt_princ, strlen(realm));
    krb5_princ_component(context, &tgt_princ,1)->data = realm;
    krb5_princ_component(context, &tgt_princ,1)->length = strlen(realm);

    printf("Initializing database '%s' for realm '%s',\n\
master key name '%s'\n",
	   dbname, realm, mkey_fullname);

    if (mkey_password) {
	pwd.data = mkey_password;
	pwd.length = strlen(mkey_password);
	retval = krb5_principal2salt(context, master_princ, &scratch);
	if (retval) {
	    com_err(argv[0], retval, "while calculated master key salt");
	    exit(1);
	}
	retval = krb5_string_to_key(context, &master_encblock, 
				    master_keyblock.keytype, &master_keyblock, 
				    &pwd, &scratch);
	if (retval) {
	    com_err(argv[0], retval,
		    "while transforming master key from password");
	    exit(1);
	}
	free(scratch.data);
    } else {
	printf("You will be prompted for the database Master Password.\n");
	printf("It is important that you NOT FORGET this password.\n");
	fflush(stdout);

	/* TRUE here means read the keyboard, and do it twice */
	if (retval = krb5_db_fetch_mkey(context, master_princ, &master_encblock,
					TRUE, TRUE, 0, &master_keyblock)) {
	    com_err(argv[0], retval, "while reading master key");
	    exit(1);
	}
    }
    
    if (retval = krb5_process_key(context, &master_encblock,&master_keyblock)){
	com_err(argv[0], retval, "while processing master key");
	exit(1);
    }

    rblock.eblock = &master_encblock;
    if (retval = krb5_init_random_key(context, &master_encblock, 
				      &master_keyblock, &rblock.rseed)) {
	com_err(argv[0], retval, "while initializing random key generator");
	(void) krb5_finish_key(context, &master_encblock);
	exit(1);
    }
    if (retval = krb5_db_create(context, dbname)) {
	(void) krb5_finish_key(context, &master_encblock);
	(void) krb5_finish_random_key(context, &master_encblock, &rblock.rseed);
	com_err(argv[0], retval, "while creating database '%s'",
		dbname);
	exit(1);
    }
    if (retval = krb5_db_set_name(context, dbname)) {
	(void) krb5_finish_key(context, &master_encblock);
	(void) krb5_finish_random_key(context, &master_encblock, &rblock.rseed);
        com_err(argv[0], retval, "while setting active database to '%s'",
                dbname);
        exit(1);
    }
    if (retval = krb5_db_init(context)) {
	(void) krb5_finish_key(context, &master_encblock);
	(void) krb5_finish_random_key(context, &master_encblock, &rblock.rseed);
	com_err(argv[0], retval, "while initializing the database '%s'",
		dbname);
	exit(1);
    }

    if ((retval = add_principal(context, master_princ, MASTER_KEY, &rblock)) ||
	(retval = add_principal(context, &tgt_princ, RANDOM_KEY, &rblock))) {
	(void) krb5_db_fini(context);
	(void) krb5_finish_key(context, &master_encblock);
	(void) krb5_finish_random_key(context, &master_encblock, &rblock.rseed);
	com_err(argv[0], retval, "while adding entries to the database");
	exit(1);
    }
    /* clean up */
    (void) krb5_db_fini(context);
    (void) krb5_finish_key(context, &master_encblock);
    (void) krb5_finish_random_key(context, &master_encblock, &rblock.rseed);
    memset((char *)master_keyblock.contents, 0, master_keyblock.length);
    exit(0);

}

static krb5_error_code
add_principal(context, princ, op, pblock)
    krb5_context context;
    krb5_principal princ;
    enum ap_op op;
    struct realm_info *pblock;
{
    krb5_db_entry entry;
    krb5_error_code retval;
    krb5_encrypted_keyblock ekey;
    krb5_keyblock *rkey;
    int nentries = 1;

    memset((char *) &entry, 0, sizeof(entry));
    entry.principal = princ;
    entry.kvno = 1;
    entry.max_life = pblock->max_life;
    entry.max_renewable_life = pblock->max_rlife;
    entry.mkvno = 1;
    entry.expiration = pblock->expiration;
    entry.mod_name = &db_create_princ;

    if (retval = krb5_timeofday(context, &entry.mod_date))
	return retval;
    entry.attributes = pblock->flags;

    switch (op) {
    case MASTER_KEY:
	entry.attributes |= KRB5_KDB_DISALLOW_ALL_TIX;
	if (retval = krb5_kdb_encrypt_key(context, pblock->eblock,
					  &master_keyblock, &ekey))
	    return retval;
	break;
    case RANDOM_KEY:
	if (retval = krb5_random_key(context, pblock->eblock, 
				     pblock->rseed, &rkey))
	    return retval;
	retval = krb5_kdb_encrypt_key(context, pblock->eblock, rkey, &ekey);
	krb5_free_keyblock(context, rkey);
	if (retval)
	    return retval;
	break;
    case NULL_KEY:
	return EOPNOTSUPP;
    default:
	break;
    }
    entry.key = ekey;
    entry.salt_type = KRB5_KDB_SALTTYPE_NORMAL;
    entry.salt_length = 0;
    entry.salt = 0;

    if (retval = krb5_db_put_principal(context, &entry, &nentries))
	return retval;

    krb5_xfree(ekey.contents);
    return 0;
}