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/*
* $Source: /afs/net/project/krb4/src/admin/RCS/kdb_edit.c,v $
* $Author: tytso $
*
* Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
* of Technology.
*
* For copying and distribution information, please see the file
* <mit-copyright.h>.
*
* This routine changes the Kerberos encryption keys for principals,
* i.e., users or services.
*/
/*
* exit returns 0 ==> success -1 ==> error
*/
#include <stdio.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#ifdef NEED_TIME_H
#include <time.h>
#endif
#include <sys/time.h>
#include <des.h>
#include <krb.h>
#include <krb_db.h>
/* MKEYFILE is now defined in kdc.h */
#include <kdc.h>
char prog[32];
char *progname = prog;
int nflag = 0;
int debug = 0;
extern int krb_debug;
Principal principal_data;
static C_Block master_key;
static Key_schedule master_key_schedule;
static long master_key_version;
static char realm[REALM_SZ];
void fatal_error(), cleanup();
void Usage();
void change_principal();
int main(argc, argv)
int argc;
char *argv[];
{
int i;
prog[sizeof prog - 1] = '\0'; /* make sure terminated */
strncpy(prog, argv[0], sizeof prog - 1); /* salt away invoking
* program */
/* Assume a long is four bytes */
if (sizeof(long) != 4) {
fprintf(stderr, "%s: size of long is %d.\n", prog, sizeof(long));
exit(-1);
}
while (--argc > 0 && (*++argv)[0] == '-')
for (i = 1; argv[0][i] != '\0'; i++) {
switch (argv[0][i]) {
/* debug flag */
case 'd':
debug = 1;
continue;
/* debug flag */
case 'l':
krb_debug |= 1;
continue;
case 'n': /* read MKEYFILE for master key */
nflag = 1;
continue;
default:
fprintf(stderr, "%s: illegal flag \"%c\"\n", progname, argv[0][i]);
Usage(); /* Give message and die */
}
};
if (krb_get_lrealm(realm, 1)) {
fprintf(stderr, "Couldn't get local realm information.\n");
fatal_error();
}
kerb_init();
if (argc > 0) {
if (kerb_db_set_name(*argv) != 0) {
fprintf(stderr, "Could not open altername database name\n");
fatal_error();
}
}
if (kdb_get_master_key ((nflag == 0),
master_key, master_key_schedule) != 0) {
fprintf (stderr, "Couldn't read master key.\n");
fatal_error();
}
if ((master_key_version = kdb_verify_master_key(master_key,
master_key_schedule,
stdout)) < 0)
fatal_error();
des_init_random_number_generator(master_key);
change_principal("krbtgt", realm);
change_principal("changepw", KRB_MASTER);
cleanup();
printf("\nKerberos database updated successfully. Note that all\n");
printf("existing ticket-granting tickets have been invalidated.\n\n");
return(0);
}
void change_principal(input_name, input_instance)
char *input_name;
char *input_instance;
{
int n, more;
C_Block new_key;
n = kerb_get_principal(input_name, input_instance, &principal_data,
1, &more);
if (!n) {
fprintf(stderr, "Can't find principal database for %s.%s.\n",
input_name, input_instance);
fatal_error();
}
if (more) {
fprintf(stderr, "More than one entry for %s.%s.\n", input_name,
input_instance);
fatal_error();
}
des_new_random_key(new_key);
/* seal it under the kerberos master key */
kdb_encrypt_key (new_key, new_key,
master_key, master_key_schedule,
ENCRYPT);
memcpy(&principal_data.key_low, new_key, 4);
memcpy(&principal_data.key_high, ((long *) new_key) + 1, 4);
memset(new_key, 0, sizeof(new_key));
principal_data.key_version++;
if (kerb_put_principal(&principal_data, 1)) {
fprintf(stderr, "\nError updating Kerberos database");
fatal_error();
}
memset(&principal_data.key_low, 0, 4);
memset(&principal_data.key_high, 0, 4);
}
void fatal_error()
{
cleanup();
exit(1);
}
void cleanup()
{
memset(master_key, 0, sizeof(master_key));
memset(master_key_schedule, 0, sizeof(master_key_schedule));
memset(&principal_data, 0, sizeof(principal_data));
}
void Usage()
{
fprintf(stderr, "Usage: %s [-n]\n", progname);
exit(1);
}
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