1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* lib/krb5/os/timeofday.c */
3 /*
4 * Copyright 1990, 2007 by the Massachusetts Institute of Technology.
5 * All Rights Reserved.
6 *
7 * Export of this software from the United States of America may
8 * require a specific license from the United States Government.
9 * It is the responsibility of any person or organization contemplating
10 * export to obtain such a license before exporting.
11 *
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of M.I.T. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. Furthermore if you modify this software you must label
20 * your software as modified software and not distribute it in such a
21 * fashion that it might be confused with the original M.I.T. software.
22 * M.I.T. makes no representations about the suitability of
23 * this software for any purpose. It is provided "as is" without express
24 * or implied warranty.
25 */
26
27 #include "k5-int.h"
28
29 #include <time.h>
30
31 krb5_error_code KRB5_CALLCONV
krb5_timeofday(krb5_context context,krb5_timestamp * timeret)32 krb5_timeofday(krb5_context context, krb5_timestamp *timeret)
33 {
34 krb5_os_context os_ctx;
35 time_t tval;
36
37 if (context == NULL)
38 return EINVAL;
39
40 os_ctx = &context->os_context;
41 if (os_ctx->os_flags & KRB5_OS_TOFFSET_TIME) {
42 *timeret = os_ctx->time_offset;
43 return 0;
44 }
45 tval = time(0);
46 if (tval == (time_t) -1)
47 return (krb5_error_code) errno;
48 if (os_ctx->os_flags & KRB5_OS_TOFFSET_VALID)
49 tval += os_ctx->time_offset;
50 *timeret = tval;
51 return 0;
52 }
53
54 krb5_error_code KRB5_CALLCONV
krb5_check_clockskew(krb5_context context,krb5_timestamp date)55 krb5_check_clockskew(krb5_context context, krb5_timestamp date)
56 {
57 krb5_timestamp currenttime;
58 krb5_error_code retval;
59
60 retval = krb5_timeofday(context, ¤ttime);
61 if (retval)
62 return retval;
63 if (!ts_within(date, currenttime, context->clockskew))
64 return KRB5KRB_AP_ERR_SKEW;
65
66 return 0;
67 }
68