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/*
* lib/krb5/keytab/srvtab/kts_util.c
*
* Copyright (c) Hewlett-Packard Company 1991
* Released to the Massachusetts Institute of Technology for inclusion
* in the Kerberos source code distribution.
*
* 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. 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.
*
*
* This function contains utilities for the srvtab based implementation
* of the keytab. There are no public functions in this file.
*/
#define NEED_SOCKETS
#include "krb5.h"
#include "k5-int.h"
#include <stdio.h>
#include "ktsrvtab.h"
#ifdef ANSI_STDIO
#define READ_MODE "rb"
#else
#define READ_MODE "r"
#endif
/* The maximum sizes for V4 aname, realm, sname, and instance +1 */
/* Taken from krb.h */
#define ANAME_SZ 40
#define REALM_SZ 40
#define SNAME_SZ 40
#define INST_SZ 40
#ifndef HAVE_ERRNO
extern int errno;
#endif
static krb5_error_code
read_field(fp, s, len)
FILE *fp;
char *s;
int len;
{
int c, n = 0;
while ((c = getc(fp)) != 0) {
if (c == EOF || len <= 1)
return KRB5_KT_END;
*s = c;
s++;
len--;
}
*s = 0;
return 0;
}
krb5_error_code
krb5_ktsrvint_open(context, id)
krb5_context context;
krb5_keytab id;
{
KTFILEP(id) = fopen(KTFILENAME(id), READ_MODE);
if (!KTFILEP(id))
return errno;
return 0;
}
krb5_error_code
krb5_ktsrvint_close(context, id)
krb5_context context;
krb5_keytab id;
{
if (!KTFILEP(id))
return 0;
(void) fclose(KTFILEP(id));
KTFILEP(id) = 0;
return 0;
}
krb5_error_code
krb5_ktsrvint_read_entry(context, id, ret_entry)
krb5_context context;
krb5_keytab id;
krb5_keytab_entry *ret_entry;
{
FILE *fp;
char name[SNAME_SZ], instance[INST_SZ], realm[REALM_SZ];
unsigned char key[8];
int vno;
krb5_error_code kerror;
/* Read in an entry from the srvtab file. */
fp = KTFILEP(id);
kerror = read_field(fp, name, sizeof(name));
if (kerror != 0)
return kerror;
kerror = read_field(fp, instance, sizeof(instance));
if (kerror != 0)
return kerror;
kerror = read_field(fp, realm, sizeof(realm));
if (kerror != 0)
return kerror;
vno = getc(fp);
if (vno == EOF)
return KRB5_KT_END;
if (fread(key, 1, sizeof(key), fp) != sizeof(key))
return KRB5_KT_END;
/* Fill in ret_entry with the data we read. Everything maps well
* except for the timestamp, which we don't have a value for. For
* now we just set it to 0. */
memset(ret_entry, 0, sizeof(*ret_entry));
ret_entry->magic = KV5M_KEYTAB_ENTRY;
kerror = krb5_425_conv_principal(context, name, instance, realm,
&ret_entry->principal);
if (kerror != 0)
return kerror;
ret_entry->vno = vno;
ret_entry->timestamp = 0;
ret_entry->key.enctype = ENCTYPE_DES_CBC_CRC;
ret_entry->key.magic = KV5M_KEYBLOCK;
ret_entry->key.length = sizeof(key);
ret_entry->key.contents = malloc(sizeof(key));
if (!ret_entry->key.contents) {
krb5_free_principal(context, ret_entry->principal);
return ENOMEM;
}
memcpy(ret_entry->key.contents, key, sizeof(key));
return 0;
}
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