1 /* 2 * lib/krb5/krb/valid_times.c 3 * 4 * Copyright 1995 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 * krb5_validate_times() 28 */ 29 30 #include "k5-int.h" 31 32 #define in_clock_skew(date) (labs((date)-currenttime) < context->clockskew) 33 34 /* 35 * This is an internal routine which validates the krb5_timestamps 36 * field in a krb5_ticket. 37 */ 38 39 krb5_error_code 40 krb5_validate_times(krb5_context context, krb5_ticket_times *times) 41 { 42 krb5_timestamp currenttime, starttime; 43 krb5_error_code retval; 44 45 if ((retval = krb5_timeofday(context, ¤ttime))) 46 return retval; 47 48 /* if starttime is not in ticket, then treat it as authtime */ 49 if (times->starttime != 0) 50 starttime = times->starttime; 51 else 52 starttime = times->authtime; 53 54 if (starttime - currenttime > context->clockskew) 55 return KRB5KRB_AP_ERR_TKT_NYV; /* ticket not yet valid */ 56 57 if ((currenttime - times->endtime) > context->clockskew) 58 return KRB5KRB_AP_ERR_TKT_EXPIRED; /* ticket expired */ 59 60 return 0; 61 } 62 63 64 65