/* * 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