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/*
* $Source$
* $Author$
*
* Copyright 1990 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.
*
*
* krb5_db_fetch_mkey():
* Fetch a database master key from somewhere.
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_fetch_mkey_c[] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/krb5.h>
#include <krb5/kdb.h>
#include <krb5/los-proto.h>
#include <krb5/ext-proto.h>
#include <krb5/sysincl.h> /* for MAXPATHLEN */
#include "kdbint.h"
/* these are available to other funcs, and the pointers may be reassigned */
char *krb5_mkey_pwd_prompt1 = KRB5_KDC_MKEY_1;
char *krb5_mkey_pwd_prompt2 = KRB5_KDC_MKEY_2;
/*
* Get the KDC database master key from somewhere, filling it into *key.
*
* key->keytype should be set to the desired key type.
*
* if fromkeyboard is TRUE, then the master key is read as a password
* from the user's terminal. In this case,
* eblock should point to a block with an appropriate string_to_key function.
* if twice is TRUE, the password is read twice for verification.
*
* mname is the name of the key sought; this can be used by the string_to_key
* function or by some other method to isolate the desired key.
*
*/
#ifndef min
#define min(a,b) (((a) < (b)) ? (a) : (b))
#endif
krb5_error_code
krb5_db_fetch_mkey(DECLARG(krb5_principal, mname),
DECLARG(krb5_encrypt_block *, eblock),
DECLARG(krb5_boolean, fromkeyboard),
DECLARG(krb5_boolean, twice),
DECLARG(krb5_data *, salt),
DECLARG(krb5_keyblock *,key))
OLDDECLARG(krb5_principal, mname)
OLDDECLARG(krb5_encrypt_block *, eblock)
OLDDECLARG(krb5_boolean, fromkeyboard)
OLDDECLARG(krb5_boolean, twice)
OLDDECLARG(krb5_data *, salt)
OLDDECLARG(krb5_keyblock *,key)
{
krb5_error_code retval;
char password[BUFSIZ];
krb5_data pwd;
int size = sizeof(password);
if (fromkeyboard) {
krb5_data scratch;
if (retval = krb5_read_password(krb5_mkey_pwd_prompt1,
twice ? krb5_mkey_pwd_prompt2 : 0,
password,
&size))
return(retval);
pwd.data = password;
pwd.length = size;
if (!salt) {
retval = krb5_principal2salt(mname, &scratch);
if (retval)
return retval;
}
retval = krb5_string_to_key(eblock, key->keytype, key, &pwd,
salt ? salt : &scratch);
if (!salt)
xfree(scratch.data);
memset(password, 0, sizeof(password)); /* erase it */
return retval;
} else {
/* from somewhere else */
krb5_keytype keytype;
char defkeyfile[MAXPATHLEN+1];
krb5_data *realm = krb5_princ_realm(mname);
FILE *kf;
retval = 0;
(void) strcpy(defkeyfile, DEFAULT_KEYFILE_STUB);
(void) strncat(defkeyfile, realm->data,
min(sizeof(defkeyfile)-sizeof(DEFAULT_KEYFILE_STUB)-1,
realm->length));
(void) strcat(defkeyfile, "");
#ifdef ANSI_STDIO
if (!(kf = fopen(defkeyfile, "rb")))
#else
if (!(kf = fopen(defkeyfile, "r")))
#endif
return KRB5_KDB_CANTREAD_STORED;
if (fread((krb5_pointer) &keytype, sizeof(keytype), 1, kf) != 1) {
retval = KRB5_KDB_CANTREAD_STORED;
goto errout;
}
if (keytype != key->keytype) {
retval = KRB5_KDB_BADSTORED_MKEY;
goto errout;
}
if (fread((krb5_pointer) &key->length,
sizeof(key->length), 1, kf) != 1) {
retval = KRB5_KDB_CANTREAD_STORED;
goto errout;
}
if (!key->length || key->length < 0) {
retval = KRB5_KDB_BADSTORED_MKEY;
goto errout;
}
if (!(key->contents = (krb5_octet *)malloc(key->length))) {
retval = ENOMEM;
goto errout;
}
if (fread((krb5_pointer) key->contents,
sizeof(key->contents[0]), key->length, kf) != key->length)
retval = KRB5_KDB_CANTREAD_STORED;
else
retval = 0;
errout:
(void) fclose(kf);
return retval;
}
}
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