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/*
* lib/krb4/password_to_key.c
*
* Copyright 1999, 2002 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. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* 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.
*
* password_to_key functions merged from KfM
*/
#include <string.h>
#include <stdlib.h>
#ifdef USE_CCAPI
#include <CredentialsCache.h>
#endif
#include "krb.h"
#include "krb4int.h"
/*
* passwd_to_key(): given a password, return a DES key.
* There are extra arguments here which (used to be?)
* used by srvtab_to_key().
*
* If the "passwd" argument is not null, generate a DES
* key from it, using string_to_key().
*
* If the "passwd" argument is null, then on a Unix system we call
* des_read_password() to prompt for a password and then convert it
* into a DES key. But "prompting" the user is harder in a Windows or
* Macintosh environment, so we rely on our caller to explicitly do
* that now.
*
* In either case, the resulting key is put in the "key" argument,
* and 0 is returned.
*/
key_proc_type *krb_get_keyprocs (key_proc_type keyproc)
{
static key_proc_type default_keyprocs[4] = { mit_passwd_to_key,
afs_passwd_to_key,
krb5_passwd_to_key,
NULL };
static key_proc_type user_keyprocs[2] = { NULL, NULL };
/* generate the list of key procs */
if (keyproc == NULL) {
return default_keyprocs; /* use the default */
} else {
user_keyprocs[0] = keyproc;
return user_keyprocs; /* use the caller provided keyprocs */
}
}
int KRB5_CALLCONV
mit_passwd_to_key(
char *user,
char *instance,
char *realm,
char *passwd,
C_Block key)
{
#if 0 /* what system? */
#pragma unused(user)
#pragma unused(instance)
#pragma unused(realm)
#endif
if (passwd) {
des_string_to_key(passwd, key);
} else {
#if !(defined(_WIN32) || defined(USE_LOGIN_LIBRARY))
des_read_password((des_cblock *)key, "Password", 0);
#else
return (-1);
#endif
}
return (0);
}
/* So we can use a v4 kinit against a v5 kdc with no krb4 salted key */
int KRB5_CALLCONV
krb5_passwd_to_key(
char *user,
char *instance,
char *realm,
char *passwd,
C_Block key)
{
size_t len, tlen;
char *p;
if (user && instance && realm && passwd) {
len = MAX_K_NAME_SZ + strlen(passwd) + 1;
tlen = strlen(passwd) + strlen(realm) + strlen(user) + strlen(instance) + 1;
if (tlen > len)
return 0;
p = malloc (tlen);
if (p != NULL) {
sprintf (p, "%s%s%s%s", passwd, realm, user, instance);
des_string_to_key (p, key);
free (p);
return 0;
}
}
return -1;
}
int KRB5_CALLCONV
afs_passwd_to_key(
char *user,
char *instance,
char *realm,
char *passwd,
C_Block key)
{
#if 0 /* what system? */
#pragma unused(user)
#pragma unused(instance)
#endif
if (passwd) {
afs_string_to_key(passwd, realm, key);
} else {
#if !(defined(_WIN32) || defined(USE_LOGIN_LIBRARY))
des_read_password((des_cblock *)key, "Password", 0);
#else
return (-1);
#endif
}
return (0);
}
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