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/*
* Ticket lifetime. This defines the table used to lookup lifetime
* for the fixed part of rande of the one byte lifetime field. Values
* less than 0x80 are intrpreted as the number of 5 minute intervals.
* Values from 0x80 to 0xBF should be looked up in this table. The
* value of 0x80 is the same using both methods: 10 and two-thirds
* hours . The lifetime of 0xBF is 30 days. The intervening values
* of have a fixed ratio of roughly 1.06914. The value 0xFF is
* defined to mean a ticket has no expiration time. This should be
* used advisedly since individual servers may impose defacto
* upperbounds on ticket lifetimes.
*/
#include "krb_locl.h"
RCSID("$Id: lifetime.c,v 1.9 1997/05/02 14:29:18 assar Exp $");
/* If you want to disable this feature */
int krb_no_long_lifetimes = 0;
#define TKTLIFENUMFIXED 64
#define TKTLIFEMINFIXED 0x80
#define TKTLIFEMAXFIXED 0xBF
#define TKTLIFENOEXPIRE 0xFF
#define MAXTKTLIFETIME (30*24*3600) /* 30 days */
#ifndef NEVERDATE
#define NEVERDATE ((unsigned long)0x7fffffffL)
#endif
static const int tkt_lifetimes[TKTLIFENUMFIXED] = {
38400, /* 10.67 hours, 0.44 days */
41055, /* 11.40 hours, 0.48 days */
43894, /* 12.19 hours, 0.51 days */
46929, /* 13.04 hours, 0.54 days */
50174, /* 13.94 hours, 0.58 days */
53643, /* 14.90 hours, 0.62 days */
57352, /* 15.93 hours, 0.66 days */
61318, /* 17.03 hours, 0.71 days */
65558, /* 18.21 hours, 0.76 days */
70091, /* 19.47 hours, 0.81 days */
74937, /* 20.82 hours, 0.87 days */
80119, /* 22.26 hours, 0.93 days */
85658, /* 23.79 hours, 0.99 days */
91581, /* 25.44 hours, 1.06 days */
97914, /* 27.20 hours, 1.13 days */
104684, /* 29.08 hours, 1.21 days */
111922, /* 31.09 hours, 1.30 days */
119661, /* 33.24 hours, 1.38 days */
127935, /* 35.54 hours, 1.48 days */
136781, /* 37.99 hours, 1.58 days */
146239, /* 40.62 hours, 1.69 days */
156350, /* 43.43 hours, 1.81 days */
167161, /* 46.43 hours, 1.93 days */
178720, /* 49.64 hours, 2.07 days */
191077, /* 53.08 hours, 2.21 days */
204289, /* 56.75 hours, 2.36 days */
218415, /* 60.67 hours, 2.53 days */
233517, /* 64.87 hours, 2.70 days */
249664, /* 69.35 hours, 2.89 days */
266926, /* 74.15 hours, 3.09 days */
285383, /* 79.27 hours, 3.30 days */
305116, /* 84.75 hours, 3.53 days */
326213, /* 90.61 hours, 3.78 days */
348769, /* 96.88 hours, 4.04 days */
372885, /* 103.58 hours, 4.32 days */
398668, /* 110.74 hours, 4.61 days */
426234, /* 118.40 hours, 4.93 days */
455705, /* 126.58 hours, 5.27 days */
487215, /* 135.34 hours, 5.64 days */
520904, /* 144.70 hours, 6.03 days */
556921, /* 154.70 hours, 6.45 days */
595430, /* 165.40 hours, 6.89 days */
636601, /* 176.83 hours, 7.37 days */
680618, /* 189.06 hours, 7.88 days */
727680, /* 202.13 hours, 8.42 days */
777995, /* 216.11 hours, 9.00 days */
831789, /* 231.05 hours, 9.63 days */
889303, /* 247.03 hours, 10.29 days */
950794, /* 264.11 hours, 11.00 days */
1016537, /* 282.37 hours, 11.77 days */
1086825, /* 301.90 hours, 12.58 days */
1161973, /* 322.77 hours, 13.45 days */
1242318, /* 345.09 hours, 14.38 days */
1328218, /* 368.95 hours, 15.37 days */
1420057, /* 394.46 hours, 16.44 days */
1518247, /* 421.74 hours, 17.57 days */
1623226, /* 450.90 hours, 18.79 days */
1735464, /* 482.07 hours, 20.09 days */
1855462, /* 515.41 hours, 21.48 days */
1983758, /* 551.04 hours, 22.96 days */
2120925, /* 589.15 hours, 24.55 days */
2267576, /* 629.88 hours, 26.25 days */
2424367, /* 673.44 hours, 28.06 days */
2592000}; /* 720.00 hours, 30.00 days */
/*
* krb_life_to_time - takes a start time and a Kerberos standard
* lifetime char and returns the corresponding end time. There are
* four simple cases to be handled. The first is a life of 0xff,
* meaning no expiration, and results in an end time of 0xffffffff.
* The second is when life is less than the values covered by the
* table. In this case, the end time is the start time plus the
* number of 5 minute intervals specified by life. The third case
* returns start plus the MAXTKTLIFETIME if life is greater than
* TKTLIFEMAXFIXED. The last case, uses the life value (minus
* TKTLIFEMINFIXED) as an index into the table to extract the lifetime
* in seconds, which is added to start to produce the end time.
*/
u_int32_t
krb_life_to_time(u_int32_t start, int life_)
{
unsigned char life = (unsigned char) life_;
if (krb_no_long_lifetimes) return start + life*5*60;
if (life == TKTLIFENOEXPIRE) return NEVERDATE;
if (life < TKTLIFEMINFIXED) return start + life*5*60;
if (life > TKTLIFEMAXFIXED) return start + MAXTKTLIFETIME;
return start + tkt_lifetimes[life - TKTLIFEMINFIXED];
}
/*
* krb_time_to_life - takes start and end times for the ticket and
* returns a Kerberos standard lifetime char, possibily using the
* tkt_lifetimes table for lifetimes above 127*5 minutes. First, the
* special case of (end == NEVERDATE) is handled to mean no
* expiration. Then negative lifetimes and those greater than the
* maximum ticket lifetime are rejected. Then lifetimes less than the
* first table entry are handled by rounding the requested lifetime
* *up* to the next 5 minute interval. The final step is to search
* the table for the smallest entry *greater than or equal* to the
* requested entry.
*/
int krb_time_to_life(u_int32_t start, u_int32_t end)
{
int i;
long lifetime = end - start;
if (krb_no_long_lifetimes) return (lifetime + 5*60 - 1)/(5*60);
if (end >= NEVERDATE) return TKTLIFENOEXPIRE;
if (lifetime > MAXTKTLIFETIME || lifetime <= 0) return 0;
if (lifetime < tkt_lifetimes[0]) return (lifetime + 5*60 - 1)/(5*60);
for (i=0; i<TKTLIFENUMFIXED; i++) {
if (lifetime <= tkt_lifetimes[i]) {
return i+TKTLIFEMINFIXED;
}
}
return 0;
}
char *
krb_life_to_atime(int life)
{
static char atime[11+1+2+1+2+1+2+1];
unsigned long when;
int secs, mins, hours;
if (life == TKTLIFENOEXPIRE && !krb_no_long_lifetimes)
return("Forever");
when = krb_life_to_time(0, life);
secs = when%60;
when /= 60;
mins = when%60;
when /= 60;
hours = when%24;
when /= 24;
snprintf(atime, sizeof(atime), "%d+%02d:%02d:%02d", (int)when, hours, mins, secs);
return(atime);
}
int
krb_atime_to_life(char *atime)
{
unsigned long when = 0;
char *cp;
int colon = 0, plus = 0;
int n = 0;
if (strcasecmp(atime, "forever") == 0)
return(TKTLIFENOEXPIRE);
for (cp=atime; *cp; cp++) {
switch(*cp) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
n = n*10 + *cp-'0';
break;
case '+':
plus++;
when += n;
when *= 24;
n = 0;
break;
case ':':
colon++;
when += n;
when *= 60;
n = 0;
break;
default:
break;
}
}
when += n;
if (plus == 0 && colon == 0)
return((unsigned char)when);
while (colon < 2) {
when *= 60;
colon++;
}
return(krb_time_to_life(0,when));
}
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