2 * $Id: lifetime.c,v 1.2 2001-02-27 21:07:20 rufustfirefly Exp $
4 * Ticket lifetime. This defines the table used to lookup lifetime
5 * for the fixed part of rande of the one byte lifetime field. Values
6 * less than 0x80 are intrpreted as the number of 5 minute intervals.
7 * Values from 0x80 to 0xBF should be looked up in this table. The
8 * value of 0x80 is the same using both methods: 10 and two-thirds
9 * hours . The lifetime of 0xBF is 30 days. The intervening values
10 * of have a fixed ratio of roughly 1.06914. The value 0xFF is
11 * defined to mean a ticket has no expiration time. This should be
12 * used advisedly since individual servers may impose defacto
13 * upperbounds on ticket lifetimes.
16 #include <sys/types.h>
17 #include <netatalk/endian.h>
19 #define TKTLIFENUMFIXED 64
20 #define TKTLIFEMINFIXED 0x80
21 #define TKTLIFEMAXFIXED 0xBF
22 #define TKTLIFENOEXPIRE 0xFF
23 #define MAXTKTLIFETIME (30*24*3600) /* 30 days */
25 #define NEVERDATE ((u_int32_t)-1L)
28 static int tkt_lifetimes[TKTLIFENUMFIXED] = {
29 38400, /* 10.67 hours, 0.44 days */
30 41055, /* 11.40 hours, 0.48 days */
31 43894, /* 12.19 hours, 0.51 days */
32 46929, /* 13.04 hours, 0.54 days */
33 50174, /* 13.94 hours, 0.58 days */
34 53643, /* 14.90 hours, 0.62 days */
35 57352, /* 15.93 hours, 0.66 days */
36 61318, /* 17.03 hours, 0.71 days */
37 65558, /* 18.21 hours, 0.76 days */
38 70091, /* 19.47 hours, 0.81 days */
39 74937, /* 20.82 hours, 0.87 days */
40 80119, /* 22.26 hours, 0.93 days */
41 85658, /* 23.79 hours, 0.99 days */
42 91581, /* 25.44 hours, 1.06 days */
43 97914, /* 27.20 hours, 1.13 days */
44 104684, /* 29.08 hours, 1.21 days */
45 111922, /* 31.09 hours, 1.30 days */
46 119661, /* 33.24 hours, 1.38 days */
47 127935, /* 35.54 hours, 1.48 days */
48 136781, /* 37.99 hours, 1.58 days */
49 146239, /* 40.62 hours, 1.69 days */
50 156350, /* 43.43 hours, 1.81 days */
51 167161, /* 46.43 hours, 1.93 days */
52 178720, /* 49.64 hours, 2.07 days */
53 191077, /* 53.08 hours, 2.21 days */
54 204289, /* 56.75 hours, 2.36 days */
55 218415, /* 60.67 hours, 2.53 days */
56 233517, /* 64.87 hours, 2.70 days */
57 249664, /* 69.35 hours, 2.89 days */
58 266926, /* 74.15 hours, 3.09 days */
59 285383, /* 79.27 hours, 3.30 days */
60 305116, /* 84.75 hours, 3.53 days */
61 326213, /* 90.61 hours, 3.78 days */
62 348769, /* 96.88 hours, 4.04 days */
63 372885, /* 103.58 hours, 4.32 days */
64 398668, /* 110.74 hours, 4.61 days */
65 426234, /* 118.40 hours, 4.93 days */
66 455705, /* 126.58 hours, 5.27 days */
67 487215, /* 135.34 hours, 5.64 days */
68 520904, /* 144.70 hours, 6.03 days */
69 556921, /* 154.70 hours, 6.45 days */
70 595430, /* 165.40 hours, 6.89 days */
71 636601, /* 176.83 hours, 7.37 days */
72 680618, /* 189.06 hours, 7.88 days */
73 727680, /* 202.13 hours, 8.42 days */
74 777995, /* 216.11 hours, 9.00 days */
75 831789, /* 231.05 hours, 9.63 days */
76 889303, /* 247.03 hours, 10.29 days */
77 950794, /* 264.11 hours, 11.00 days */
78 1016537, /* 282.37 hours, 11.77 days */
79 1086825, /* 301.90 hours, 12.58 days */
80 1161973, /* 322.77 hours, 13.45 days */
81 1242318, /* 345.09 hours, 14.38 days */
82 1328218, /* 368.95 hours, 15.37 days */
83 1420057, /* 394.46 hours, 16.44 days */
84 1518247, /* 421.74 hours, 17.57 days */
85 1623226, /* 450.90 hours, 18.79 days */
86 1735464, /* 482.07 hours, 20.09 days */
87 1855462, /* 515.41 hours, 21.48 days */
88 1983758, /* 551.04 hours, 22.96 days */
89 2120925, /* 589.15 hours, 24.55 days */
90 2267576, /* 629.88 hours, 26.25 days */
91 2424367, /* 673.44 hours, 28.06 days */
92 2592000}; /* 720.00 hours, 30.00 days */
95 * krb_life_to_time - takes a start time and a Kerberos standard
96 * lifetime char and returns the corresponding end time. There are
97 * four simple cases to be handled. The first is a life of 0xff,
98 * meaning no expiration, and results in an end time of 0xffffffff.
99 * The second is when life is less than the values covered by the
100 * table. In this case, the end time is the start time plus the
101 * number of 5 minute intervals specified by life. The third case
102 * returns start plus the MAXTKTLIFETIME if life is greater than
103 * TKTLIFEMAXFIXED. The last case, uses the life value (minus
104 * TKTLIFEMINFIXED) as an index into the table to extract the lifetime
105 * in seconds, which is added to start to produce the end time.
107 u_int32_t krb_life_to_time(start, life)
111 life = (unsigned char) life;
112 if (life == TKTLIFENOEXPIRE) return NEVERDATE;
113 if (life < TKTLIFEMINFIXED) return start + life*5*60;
114 if (life > TKTLIFEMAXFIXED) return start + MAXTKTLIFETIME;
115 return start + tkt_lifetimes[life - TKTLIFEMINFIXED];
119 * krb_time_to_life - takes start and end times for the ticket and
120 * returns a Kerberos standard lifetime char, possibily using the
121 * tkt_lifetimes table for lifetimes above 127*5 minutes. First, the
122 * special case of (end == NEVERDATE) is handled to mean no
123 * expiration. Then negative lifetimes and those greater than the
124 * maximum ticket lifetime are rejected. Then lifetimes less than the
125 * first table entry are handled by rounding the requested lifetime
126 * *up* to the next 5 minute interval. The final step is to search
127 * the table for the smallest entry *greater than or equal* to the
130 int krb_time_to_life(start, end)
137 if (end == NEVERDATE) return TKTLIFENOEXPIRE;
138 lifetime = end - start;
139 if (lifetime > MAXTKTLIFETIME || lifetime <= 0) return 0;
140 if (lifetime < tkt_lifetimes[0]) return (lifetime + 5*60 - 1)/(5*60);
141 for (i=0; i<TKTLIFENUMFIXED; i++) {
142 if (lifetime <= tkt_lifetimes[i]) {
143 return i+TKTLIFEMINFIXED;