/*
 * admin/edit/kdb5_edit.c
 *
 * (C) Copyright 1990,1991, 1996 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.
 * 
 *
 * Edit a KDC database.
 */

#include <stdio.h>
#include <k5-int.h>
#include <kadm5/admin.h>
#include <kadm5/adb.h>
#include <time.h>
#include "kdb5_util.h"

char	*Err_no_master_msg = "Master key not entered!\n";
char	*Err_no_database = "Database not currently opened!\n";

/*
 * XXX Ick, ick, ick.  These global variables shouldn't be global....
 */
char *mkey_password = 0;

/*
 * I can't figure out any way for this not to be global, given how ss
 * works.
 */

int exit_status = 0;
krb5_context util_context;
osa_adb_policy_t policy_db;
kadm5_config_params global_params;

usage()
{
     fprintf(stderr, "Usage: "
	   "kdb5_util cmd [-r realm] [-d dbname] [-k mkeytype] [-M mkeyname]\n"
	     "\t         [-m] [cmd options]\n"
	     "\tcreate	[-s]\n"
	     "\tdestroy	[-f]\n"
	     "\tstash	[-f keyfile]\n"
	     "\tdump	[-old] [-ov] [-b6] [-verbose] [filename	[princs...]]\n"
	     "\tload	[-old] [-ov] [-b6] [-verbose] [-update] filename\n"
	     "\tdump_v4	[filename]\n"
	     "\tload_v4	[-t] [-n] [-v] [-K] inputfile\n");
     exit(1);
}

krb5_keyblock master_keyblock;
krb5_principal master_princ;
krb5_db_entry master_entry;
krb5_encrypt_block master_encblock;
krb5_pointer master_random;
int	valid_master_key = 0;

char *progname;
krb5_boolean manual_mkey = FALSE;
krb5_boolean dbactive = FALSE;

int kdb5_create(int, char **);
int kdb5_destroy(int, char **);
int kdb5_stash(int, char **);
int dump_db(int, char **);
int load_db(int, char **);
int dump_v4db(int, char **);
int load_v4db(int, char **);
   
typedef int (*cmd_func)(int, char **);

struct _cmd_table {
     char *name;
     cmd_func func;
     int opendb;
} cmd_table[] = {
     "create", kdb5_create, 0,
     "destroy", kdb5_destroy, 1,
     "stash", kdb5_stash, 1,
     "dump", dump_db, 1,
     "load", load_db, 0,
     "dump_v4", dump_v4db, 1,
     "load_v4", load_v4db, 0,
     NULL, NULL, 0,
};

struct _cmd_table *cmd_lookup(name)
   char *name;
{
     struct _cmd_table *cmd = cmd_table;
     while (cmd->name) {
	  if (strcmp(cmd->name, name) == 0)
	       return cmd;
	  else
	       cmd++;
     }
     
     return NULL;
}

#define ARG_VAL (--argc > 0 ? optarg = *(++argv) : (usage(), NULL))
     
int main(argc, argv)
    int argc;
    char *argv[];
{
    struct _cmd_table *cmd = NULL;
    char *optarg, **cmd_argv;	
    int cmd_argc;
    krb5_error_code retval;

    retval = krb5_init_context(&util_context);
    if (retval) {
	    fprintf(stderr, "krb5_init_context failed with error #%ld\n",
		    (long) retval);
	    exit(1);
    }
    krb5_init_ets(util_context);
    initialize_adb_error_table();

    progname = (strrchr(argv[0], '/') ? strrchr(argv[0], '/')+1 : argv[0]);

    cmd_argv = (char **) malloc(sizeof(char *)*argc);
    if (cmd_argv == NULL) {
	 com_err(progname, ENOMEM, "while creating sub-command arguments");
	 exit(1);
    }
    memset(cmd_argv, 0, sizeof(char *)*argc);
    cmd_argc = 1;
	 
    argv++; argc--;
    while (*argv) {
       if (strcmp(*argv, "-P") == 0 && ARG_VAL) {
	    mkey_password = optarg;
	    manual_mkey = TRUE;
       } else if (strcmp(*argv, "-d") == 0 && ARG_VAL) {
	    global_params.dbname = optarg;
	    global_params.mask |= KADM5_CONFIG_DBNAME;
       } else if (strcmp(*argv, "-r") == 0 && ARG_VAL) {
	    global_params.realm = optarg;
	    global_params.mask |= KADM5_CONFIG_REALM;
	    /* not sure this is really necessary */
	    if ((retval = krb5_set_default_realm(util_context,
						 global_params.realm))) {
		 com_err(progname, retval, "while setting default realm name");
		 exit(1);
	    }
       } else if (strcmp(*argv, "-k") == 0 && ARG_VAL) {
	    if (krb5_string_to_enctype(optarg, &global_params.enctype))
		 com_err(argv[0], 0, "%s is an invalid enctype", optarg);
	    else
		 global_params.mask |= KADM5_CONFIG_ENCTYPE;
       } else if (strcmp(*argv, "-M") == 0 && ARG_VAL) {
	    global_params.mkey_name = optarg;
	    global_params.mask |= KADM5_CONFIG_MKEY_NAME;
       } else if (strcmp(*argv, "-f") == 0 && ARG_VAL) {
	    global_params.stash_file = optarg;
	    global_params.mask |= KADM5_CONFIG_STASH_FILE;
       } else if (strcmp(*argv, "-m") == 0) {
	    manual_mkey = TRUE;
	    global_params.mkey_from_kbd = 1;
	    global_params.mask |= KADM5_CONFIG_MKEY_FROM_KBD;
       } else if (cmd_lookup(*argv) != NULL) {
	    if (cmd_argv[0] == NULL)
		 cmd_argv[0] = *argv;
	    else
		 usage();
       } else {
	    cmd_argv[cmd_argc++] = *argv;
       }
       argv++; argc--;
    }

    if (cmd_argv[0] == NULL)
	 usage();
    
    if (retval = kadm5_get_config_params(util_context, NULL, NULL,
					 &global_params, &global_params)) {
	 com_err(argv[0], retval, "while retreiving configuration parameters");
	 exit(1);
    }

    /*
     * Dump creates files which should not be world-readable.  It is
     * easiest to do a single umask call here.
     */
    (void) umask(077);

    master_keyblock.enctype = global_params.enctype;
    if (master_keyblock.enctype != ENCTYPE_UNKNOWN) {
	if (!valid_enctype(master_keyblock.enctype)) {
	    char tmp[32];
	    if (krb5_enctype_to_string(master_keyblock.enctype,
				       tmp, sizeof(tmp)))
		com_err(argv[0], KRB5_PROG_KEYTYPE_NOSUPP,
			"while setting up enctype %d", master_keyblock.enctype);
	    else
		com_err(argv[0], KRB5_PROG_KEYTYPE_NOSUPP, tmp);
	    exit(1);
	}
	krb5_use_enctype(util_context, &master_encblock,
			 master_keyblock.enctype);
    }

    cmd = cmd_lookup(cmd_argv[0]);
    if (cmd->opendb && open_db_and_mkey())
	 return exit_status;

    (*cmd->func)(cmd_argc, cmd_argv);
    return exit_status;
}

#if 0
/*
 * This function is no longer used in kdb5_util (and it would no
 * longer work, anyway).
 */
void set_dbname(argc, argv)
    int argc;
    char *argv[];
{
    krb5_error_code retval;

    if (argc < 3) {
	com_err(argv[0], 0, "Too few arguments");
	com_err(argv[0], 0, "Usage: %s dbpathname realmname", argv[0]);
	exit_status++;
	return;
    }
    if (dbactive) {
	if ((retval = krb5_db_fini(util_context)) && retval!= KRB5_KDB_DBNOTINITED) {
	    com_err(argv[0], retval, "while closing previous database");
	    exit_status++;
	    return;
	}
	if (valid_master_key) {
		(void) krb5_finish_key(util_context, &master_encblock);
		(void) krb5_finish_random_key(util_context, &master_encblock,
					      &master_random);
		memset((char *)master_keyblock.contents, 0,
		       master_keyblock.length);
		krb5_xfree(master_keyblock.contents);
		master_keyblock.contents = NULL;
		valid_master_key = 0;
	}
	krb5_free_principal(util_context, master_princ);
	dbactive = FALSE;
    }

    (void) set_dbname_help(argv[0], argv[1]);
    return;
}
#endif

/*
 * open_db_and_mkey: Opens the KDC and policy database, and sets the
 * global master_* variables.  Sets dbactive to TRUE if the databases
 * are opened, and valid_master_key to 1 if the global master
 * variables are set properly.  Returns 0 on success, and 1 on
 * failure, but it is not considered a failure if the master key
 * cannot be fetched (the master key stash file may not exist when the
 * program is run).
 */
int open_db_and_mkey()
{
    krb5_error_code retval;
    int nentries, i;
    krb5_boolean more;
    krb5_data scratch, pwd;

    dbactive = FALSE;
    valid_master_key = 0;

    if ((retval = krb5_db_set_name(util_context, global_params.dbname))) {
	com_err(progname, retval, "while setting active database to '%s'",
		global_params.dbname);
	exit_status++;
	return(1);
    } 
    if ((retval = krb5_db_init(util_context))) {
	com_err(progname, retval, "while initializing database");
	exit_status++;
	return(1);
    }
    if (retval = osa_adb_open_policy(&policy_db, &global_params)) {
	 com_err(progname, retval, "opening policy database");
	 exit_status++;
	 return (1);
    }

   /* assemble & parse the master key name */

    if ((retval = krb5_db_setup_mkey_name(util_context,
					  global_params.mkey_name,
					  global_params.realm, 
					  0, &master_princ))) {
	com_err(progname, retval, "while setting up master key name");
	exit_status++;
	return(1);
    }
    nentries = 1;
    if ((retval = krb5_db_get_principal(util_context, master_princ, 
					&master_entry, &nentries, &more))) {
	com_err(progname, retval, "while retrieving master entry");
	exit_status++;
	(void) krb5_db_fini(util_context);
	return(1);
    } else if (more) {
	com_err(progname, KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE,
		"while retrieving master entry");
	exit_status++;
	(void) krb5_db_fini(util_context);
	return(1);
    } else if (!nentries) {
	com_err(progname, KRB5_KDB_NOENTRY, "while retrieving master entry");
	exit_status++;
	(void) krb5_db_fini(util_context);
	return(1);
    }

    krb5_db_free_principal(util_context, &master_entry, nentries);

    /* the databases are now open, and the master principal exists */
    dbactive = TRUE;
    
    if (mkey_password) {
	pwd.data = mkey_password;
	pwd.length = strlen(mkey_password);
	retval = krb5_principal2salt(util_context, master_princ, &scratch);
	if (retval) {
	    com_err(progname, retval, "while calculated master key salt");
	    return(1);
	}

	/* If no encryption type is set, use the default */
	if (master_keyblock.enctype == ENCTYPE_UNKNOWN) {
		master_keyblock.enctype = DEFAULT_KDC_ENCTYPE;
		if (!valid_enctype(master_keyblock.enctype)) {
			char tmp[32];
			if (krb5_enctype_to_string(master_keyblock.enctype,
						   tmp, sizeof(tmp)))
				com_err(progname, KRB5_PROG_KEYTYPE_NOSUPP,
					"while setting up enctype %d", master_keyblock.enctype);
			else
				com_err(progname, KRB5_PROG_KEYTYPE_NOSUPP, tmp);
			exit(1);
		}
		krb5_use_enctype(util_context, &master_encblock,
				 master_keyblock.enctype);
	}

	retval = krb5_string_to_key(util_context, &master_encblock, 
				    &master_keyblock, &pwd, &scratch);
	if (retval) {
	    com_err(progname, retval,
		    "while transforming master key from password");
	    return(1);
	}
	free(scratch.data);
	mkey_password = 0;
    } else if ((retval = krb5_db_fetch_mkey(util_context, master_princ, 
					    &master_encblock, manual_mkey, 
					    FALSE, global_params.stash_file,
					    0, &master_keyblock))) {
	com_err(progname, retval, "while reading master key");
	com_err(progname, 0, "Warning: proceeding without master key");
	exit_status++;
	return(0);
    }
    if ((retval = krb5_db_verify_master_key(util_context, master_princ, 
					    &master_keyblock,&master_encblock))
	) {
	com_err(progname, retval, "while verifying master key");
	exit_status++;
	memset((char *)master_keyblock.contents, 0, master_keyblock.length);
	krb5_xfree(master_keyblock.contents);
	return(1);
    }
    if ((retval = krb5_process_key(util_context, &master_encblock,
				   &master_keyblock))) {
	com_err(progname, retval, "while processing master key");
	exit_status++;
	memset((char *)master_keyblock.contents, 0, master_keyblock.length);
	krb5_xfree(master_keyblock.contents);
	return(1);
    }
    if ((retval = krb5_init_random_key(util_context, &master_encblock,
				       &master_keyblock,
				       &master_random))) {
	com_err(progname, retval, "while initializing random key generator");
	exit_status++;
	(void) krb5_finish_key(util_context, &master_encblock);
	memset((char *)master_keyblock.contents, 0, master_keyblock.length);
	krb5_xfree(master_keyblock.contents);
	return(1);
    }

    valid_master_key = 1;
    dbactive = TRUE;
    return 0;
}

#ifdef HAVE_GETCWD
#undef getwd
#endif

int 
quit()
{
    krb5_error_code retval;
    static krb5_boolean finished = 0;

    if (finished)
	return 0;
    if (valid_master_key) {
	    (void) krb5_finish_key(util_context, &master_encblock);
	    (void) krb5_finish_random_key(util_context, &master_encblock, 
					  &master_random);
    }
    retval = krb5_db_fini(util_context);
    memset((char *)master_keyblock.contents, 0, master_keyblock.length);
    finished = TRUE;
    if (retval && retval != KRB5_KDB_DBNOTINITED) {
	com_err(progname, retval, "while closing database");
	exit_status++;
	return 1;
    }
    return 0;
}