/* * $Source: /afs/sipb.mit.edu/project/sipb-athena/repository/src/zephyr/server/kopt.c,v $ * $Author: ghudson $ * * Copyright 1985, 1986, 1987, 1988, 1990, 1991 by the Massachusetts * Institute of Technology. * * For copying and distribution information, please see the file * . */ /* * This includes code taken from: * Kerberos: rd_req.c,v 4.16 89/03/22 14:52:06 jtkohl Exp * Kerberos: prot.h,v 4.13 89/01/24 14:27:22 jtkohl Exp * Kerberos: krb_conf.h,v 4.0 89/01/23 09:59:27 jtkohl Exp */ #ifndef lint #ifndef SABER static char *rcsid_rd_req_c = "$Id: kopt.c,v 1.10 1996/06/02 08:05:18 ghudson Exp $"; #endif /* lint */ #endif /* SABER */ #ifdef KERBEROS #ifndef NOENCRYPTION #include #include #include #include #include "zserver.h" /* Byte ordering */ static int krbONE; #define HOST_BYTE_ORDER (* (char *) &krbONE) #define KRB_PROT_VERSION 4 /* Message types , always leave lsb for byte order */ #define AUTH_MSG_KDC_REQUEST 1<<1 #define AUTH_MSG_KDC_REPLY 2<<1 #define AUTH_MSG_APPL_REQUEST 3<<1 #define AUTH_MSG_APPL_REQUEST_MUTUAL 4<<1 #define AUTH_MSG_ERR_REPLY 5<<1 #define AUTH_MSG_PRIVATE 6<<1 #define AUTH_MSG_SAFE 7<<1 #define AUTH_MSG_APPL_ERR 8<<1 #define AUTH_MSG_DIE 63<<1 /* values for kerb error codes */ #define KERB_ERR_OK 0 #define KERB_ERR_NAME_EXP 1 #define KERB_ERR_SERVICE_EXP 2 #define KERB_ERR_AUTH_EXP 3 #define KERB_ERR_PKT_VER 4 #define KERB_ERR_NAME_MAST_KEY_VER 5 #define KERB_ERR_SERV_MAST_KEY_VER 6 #define KERB_ERR_BYTE_ORDER 7 #define KERB_ERR_PRINCIPAL_UNKNOWN 8 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE 9 #define KERB_ERR_NULL_KEY 10 #include #include extern int krb_ap_req_debug; extern struct timeval t_local; /* * Keep the following information around for subsequent calls * to this routine by the same server using the same key. */ static Sched serv_ksched; /* Key sched to decrypt ticket */ static des_cblock serv_key; /* Initialization vector */ static int st_kvno; /* version number for this key */ static char st_rlm[REALM_SZ]; /* server's realm */ static char st_nam[ANAME_SZ]; /* service name */ static char st_inst[INST_SZ]; /* server's instance */ /* * Cache of key schedules */ #define HASH_SIZE_1 255 /* not a power of 2 */ #define HASH_SIZE_2 3 static unsigned long last_use; typedef struct { unsigned long last_time_used; des_cblock key; Sched schedule; } KeySchedRec; static KeySchedRec scheds[HASH_SIZE_1][HASH_SIZE_2]; #ifdef __STDC__ Sched* check_key_sched_cache (des_cblock key) #else Sched* check_key_sched_cache (key) des_cblock key; #endif { unsigned int hash_value = key[0] + key[1] * 256; KeySchedRec *rec = scheds[hash_value % HASH_SIZE_1]; int i; for (i = HASH_SIZE_2 - 1; i >= 0; i--) if (rec[i].last_time_used && key[0] == rec[i].key[0] && !memcmp (key, rec[i].key, sizeof (des_cblock))) { rec[i].last_time_used = last_use++; return &rec[i].schedule; } return 0; } #ifdef __STDC__ void add_to_key_sched_cache (des_cblock key, Sched* sched) #else void add_to_key_sched_cache (key, sched) des_cblock key; Sched* sched; #endif { unsigned int hash_value = key[0] + key[1] * 256; KeySchedRec *rec = scheds[hash_value % HASH_SIZE_1]; int i, oldest = HASH_SIZE_2 - 1; for (i = HASH_SIZE_2 - 1; i >= 0; i--) { if (rec[i].last_time_used == 0) { oldest = i; break; } if (rec[i].last_time_used < rec[oldest].last_time_used) oldest = i; } (void) memcpy (rec[oldest].key, key, sizeof (des_cblock)); rec[oldest].schedule = *sched; rec[oldest].last_time_used = last_use++; } /* * This file contains two functions. krb_set_key() takes a DES * key or password string and returns a DES key (either the original * key, or the password converted into a DES key) and a key schedule * for it. * * krb_rd_req() reads an authentication request and returns information * about the identity of the requestor, or an indication that the * identity information was not authentic. */ /* * krb_set_key() takes as its first argument either a DES key or a * password string. The "cvt" argument indicates how the first * argument "key" is to be interpreted: if "cvt" is null, "key" is * taken to be a DES key; if "cvt" is non-null, "key" is taken to * be a password string, and is converted into a DES key using * string_to_key(). In either case, the resulting key is returned * in the external variable "serv_key". A key schedule is * generated for "serv_key" and returned in the external variable * "serv_ksched". * * This routine returns the return value of des_key_sched. * * krb_set_key() needs to be in the same .o file as krb_rd_req() so that * the key set by krb_set_key() is available in private storage for * krb_rd_req(). */ int krb_set_key(key,cvt) char *key; int cvt; { #ifdef NOENCRYPTION (void) memset(serv_key, 0, sizeof(serv_key)); return KSUCCESS; #else /* Encrypt */ Sched *s; int ret; if (cvt) string_to_key(key,serv_key); else (void) memcpy((char *)serv_key,key,8); s = check_key_sched_cache (serv_key); if (s) { serv_ksched = *s; return 0; } ret = des_key_sched (serv_key, serv_ksched.s); add_to_key_sched_cache (serv_key, &serv_ksched); return ret; #endif /* NOENCRYPTION */ } /* * krb_rd_req() takes an AUTH_MSG_APPL_REQUEST or * AUTH_MSG_APPL_REQUEST_MUTUAL message created by krb_mk_req(), * checks its integrity and returns a judgement as to the requestor's * identity. * * The "authent" argument is a pointer to the received message. * The "service" and "instance" arguments name the receiving server, * and are used to get the service's ticket to decrypt the ticket * in the message, and to compare against the server name inside the * ticket. "from_addr" is the network address of the host from which * the message was received; this is checked against the network * address in the ticket. If "from_addr" is zero, the check is not * performed. "ad" is an AUTH_DAT structure which is * filled in with information about the sender's identity according * to the authenticator and ticket sent in the message. Finally, * "fn" contains the name of the file containing the server's key. * (If "fn" is NULL, the server's key is assumed to have been set * by krb_set_key(). If "fn" is the null string ("") the default * file KEYFILE, defined in "krb.h", is used.) * * krb_rd_req() returns RD_AP_OK if the authentication information * was genuine, or one of the following error codes (defined in * "krb.h"): * * RD_AP_VERSION - wrong protocol version number * RD_AP_MSG_TYPE - wrong message type * RD_AP_UNDEC - couldn't decipher the message * RD_AP_INCON - inconsistencies found * RD_AP_BADD - wrong network address * RD_AP_TIME - client time (in authenticator) * too far off server time * RD_AP_NYV - Kerberos time (in ticket) too * far off server time * RD_AP_EXP - ticket expired * * For the message format, see krb_mk_req(). * * Mutual authentication is not implemented. */ krb_rd_req(authent,service,instance,from_addr,ad,fn) register KTEXT authent; /* The received message */ char *service; /* Service name */ char *instance; /* Service instance */ long from_addr; /* Net address of originating host */ AUTH_DAT *ad; /* Structure to be filled in */ char *fn; /* Filename to get keys from */ { KTEXT_ST ticket; /* Temp storage for ticket */ KTEXT tkt = &ticket; KTEXT_ST req_id_st; /* Temp storage for authenticator */ register KTEXT req_id = &req_id_st; char realm[REALM_SZ]; /* Realm of issuing kerberos */ Sched seskey_sched, *sched; /* Key sched for session key */ unsigned char skey[KKEY_SZ]; /* Session key from ticket */ char sname[SNAME_SZ]; /* Service name from ticket */ char iname[INST_SZ]; /* Instance name from ticket */ char r_aname[ANAME_SZ]; /* Client name from authenticator */ char r_inst[INST_SZ]; /* Client instance from authenticator */ char r_realm[REALM_SZ]; /* Client realm from authenticator */ unsigned int r_time_ms; /* Fine time from authenticator */ unsigned long r_time_sec; /* Coarse time from authenticator */ register char *ptr; /* For stepping through */ unsigned long delta_t; /* Time in authenticator - local time */ long tkt_age; /* Age of ticket */ int swap_bytes; /* Need to swap bytes? */ int mutual; /* Mutual authentication requested? */ unsigned char s_kvno; /* Version number of the server's key * Kerberos used to encrypt ticket */ int status; if (authent->length <= 0) return(RD_AP_MODIFIED); ptr = (char *) authent->dat; /* get msg version, type and byte order, and server key version */ /* check version */ if (KRB_PROT_VERSION != (unsigned int) *ptr++) return(RD_AP_VERSION); /* byte order */ swap_bytes = 0; if ((*ptr & 1) != HOST_BYTE_ORDER) swap_bytes++; /* check msg type */ mutual = 0; switch (*ptr++ & ~1) { case AUTH_MSG_APPL_REQUEST: break; case AUTH_MSG_APPL_REQUEST_MUTUAL: mutual++; break; default: return(RD_AP_MSG_TYPE); } #ifdef lint /* XXX mutual is set but not used; why??? */ /* this is a crock to get lint to shut up */ if (mutual) mutual = 0; #endif /* lint */ s_kvno = *ptr++; /* get server key version */ (void) strcpy(realm,ptr); /* And the realm of the issuing KDC */ ptr += strlen(ptr) + 1; /* skip the realm "hint" */ /* * If "fn" is NULL, key info should already be set; don't * bother with ticket file. Otherwise, check to see if we * already have key info for the given server and key version * (saved in the static st_* variables). If not, go get it * from the ticket file. If "fn" is the null string, use the * default ticket file. */ if (fn && (strcmp(st_nam,service) || strcmp(st_inst,instance) || strcmp(st_rlm,realm) || (st_kvno != s_kvno))) { if (*fn == 0) fn = KEYFILE; st_kvno = s_kvno; #ifndef NOENCRYPTION if (read_service_key(service,instance,realm,(int) s_kvno, fn,(char *)skey)) return(RD_AP_UNDEC); if ((status = krb_set_key((char *)skey,0)) != 0) return(status); #endif /* !NOENCRYPTION */ (void) strcpy(st_rlm,realm); (void) strcpy(st_nam,service); (void) strcpy(st_inst,instance); } /* Get ticket from authenticator */ tkt->length = (int) *ptr++; if ((tkt->length + (ptr+1 - (char *) authent->dat)) > authent->length) return(RD_AP_MODIFIED); (void) memcpy((char *)(tkt->dat),ptr+1,tkt->length); if (krb_ap_req_debug) log("ticket->length: %d",tkt->length); #ifndef NOENCRYPTION /* Decrypt and take apart ticket */ #endif if (decomp_ticket(tkt,&ad->k_flags,ad->pname,ad->pinst,ad->prealm, &(ad->address),ad->session, &(ad->life), &(ad->time_sec),sname,iname,serv_key,serv_ksched.s)) return(RD_AP_UNDEC); if (krb_ap_req_debug) { log("Ticket Contents."); log(" Aname: %s.%s",ad->pname, ((int)*(ad->prealm) ? ad->prealm : "Athena")); log(" Service: %s%s%s",sname,((int)*iname ? "." : ""),iname); } /* Extract the authenticator */ req_id->length = (int) *(ptr++); if ((req_id->length + (ptr + tkt->length - (char *) authent->dat)) > authent->length) return(RD_AP_MODIFIED); (void) memcpy((char *)(req_id->dat),ptr + tkt->length, req_id->length); #ifndef NOENCRYPTION /* And decrypt it with the session key from the ticket */ if (krb_ap_req_debug) log("About to decrypt authenticator"); sched = check_key_sched_cache (ad->session); if (!sched) { sched = &seskey_sched; key_sched (ad->session, seskey_sched.s); add_to_key_sched_cache (ad->session, &seskey_sched); } /* can't do much to optimize this... */ pcbc_encrypt((C_Block *)req_id->dat,(C_Block *)req_id->dat, (long) req_id->length, sched->s, ad->session,DES_DECRYPT); if (krb_ap_req_debug) log("Done."); #endif /* NOENCRYPTION */ #define check_ptr() if ((ptr - (char *) req_id->dat) > req_id->length) return(RD_AP_MODIFIED); ptr = (char *) req_id->dat; (void) strcpy(r_aname,ptr); /* Authentication name */ ptr += strlen(r_aname)+1; check_ptr(); (void) strcpy(r_inst,ptr); /* Authentication instance */ ptr += strlen(r_inst)+1; check_ptr(); (void) strcpy(r_realm,ptr); /* Authentication name */ ptr += strlen(r_realm)+1; check_ptr(); (void) memcpy((char *)&ad->checksum,ptr,4); /* Checksum */ ptr += 4; check_ptr(); if (swap_bytes) swap_u_long(ad->checksum); r_time_ms = *(ptr++); /* Time (fine) */ #ifdef lint /* XXX r_time_ms is set but not used. why??? */ /* this is a crock to get lint to shut up */ if (r_time_ms) r_time_ms = 0; #endif /* lint */ check_ptr(); /* assume sizeof(r_time_sec) == 4 ?? */ (void) memcpy((char *)&r_time_sec,ptr,4); /* Time (coarse) */ if (swap_bytes) swap_u_long(r_time_sec); /* Check for authenticity of the request */ if (krb_ap_req_debug) log("Pname: %s %s",ad->pname,r_aname); if (strcmp(ad->pname,r_aname) != 0) return(RD_AP_INCON); if (strcmp(ad->pinst,r_inst) != 0) return(RD_AP_INCON); if (krb_ap_req_debug) log("Realm: %s %s",ad->prealm,r_realm); if ((strcmp(ad->prealm,r_realm) != 0)) return(RD_AP_INCON); if (krb_ap_req_debug) log("Address: %d %d",ad->address,from_addr); if (from_addr && (ad->address != from_addr)) return(RD_AP_BADD); delta_t = abs((int)(t_local.tv_sec - r_time_sec)); if (delta_t > CLOCK_SKEW) { (void) gettimeofday(&t_local, (struct timezone *)0); delta_t = abs((int)(t_local.tv_sec - r_time_sec)); if (delta_t > CLOCK_SKEW) { if (krb_ap_req_debug) log("Time out of range: %d - %d = %d", t_local.tv_sec,r_time_sec,delta_t); return(RD_AP_TIME); } } /* Now check for expiration of ticket */ tkt_age = t_local.tv_sec - ad->time_sec; if (krb_ap_req_debug) log("Time: %d Issue Date: %d Diff: %d Life %x", t_local.tv_sec,ad->time_sec,tkt_age,ad->life); if (t_local.tv_sec < ad->time_sec) { if ((ad->time_sec - t_local.tv_sec) > CLOCK_SKEW) return(RD_AP_NYV); } else if ((t_local.tv_sec - ad->time_sec) > 5 * 60 * ad->life) return(RD_AP_EXP); /* All seems OK */ ad->reply.length = 0; return(RD_AP_OK); } #endif /* NOENCRYPTION */ static char local_realm_buffer[REALM_SZ+1]; krb_get_lrealm(r,n) char *r; int n; { FILE *cnffile, *fopen(); if (n > 1) return(KFAILURE); /* Temporary restriction */ if (local_realm_buffer[0]) { strcpy (r, local_realm_buffer); return KSUCCESS; } if ((cnffile = fopen(KRB_CONF, "r")) == NULL) { if (n == 1) { (void) strcpy(r, KRB_REALM); return(KSUCCESS); } else return(KFAILURE); } if (fscanf(cnffile,"%s",r) != 1) { (void) fclose(cnffile); return(KFAILURE); } (void) fclose(cnffile); return(KSUCCESS); } #endif /* KERBEROS */ #ifdef ibm032 #if defined (__GNUC__) || defined (__HIGHC__) #ifdef __HIGHC__ #define asm _ASM #endif /* * Copyright (C) 1990 by the Massachusetts Institute of Technology * * Permission to use, copy, modify, and distribute this software and its * documentation for any purpose and without fee is hereby granted. */ void asm_wrapper_kopt_c () { /* * Multiply routine. The C library routine tries to optimize around * the multiply-step instruction, which was slower in earlier versions * of the processor; this is no longer useful. Derived from assembly * code written by John Carr. */ /* data section */ asm(".data\n.align 2"); asm(".globl _ulmul$$ \n _ulmul$$:"); asm(".globl _lmul$$ \n _lmul$$: .long lmul$$"); /* text section */ asm(".text \n .align 1"); asm(".globl lmul$$ \n lmul$$:"); asm(".globl ulmul$$ \n ulmul$$:"); asm(".globl _.lmul$$ \n _.lmul$$:"); asm(".globl _.ulmul$$ \n _.ulmul$$:"); asm(" s r0,r0 \n mts r10,r2"); /* set up multiply, and go: */ asm(" m r0,r3 \n m r0,r3 \n m r0,r3 \n m r0,r3"); /* execute 4 steps */ asm(" m r0,r3 \n m r0,r3 \n m r0,r3 \n m r0,r3"); /* execute 4 steps */ asm(" m r0,r3 \n m r0,r3 \n m r0,r3 \n m r0,r3"); /* execute 4 steps */ asm(" m r0,r3 \n m r0,r3 \n m r0,r3 \n m r0,r3"); /* execute 4 steps */ asm(" brx r15 \n mfs r10,r2"); /* return result */ asm(" .long 0xdf02df00"); /* for debugging */ #ifdef USE_LIBC_STRLEN } #else /* Note- do not use this version of strlen when compiling with -g; -g */ /* causes extra no-ops to be inserted between instructions, which cause */ /* the delayed branch instructions to fail. */ /* * Fast strlen, with optional trapping of null pointers. Also from * John Carr. */ /* data */ asm(".data\n.align 2"); asm(".globl _strlen \n _strlen: .long _.strlen"); /* text */ asm(".text\n.align 1"); asm(".globl _.strlen \n _.strlen:"); #if 1 asm(" ti 2,r2,0"); /* trap if r2 is NULL */ #endif asm(" ls r4,0(r2)"); asm(" mr r0,r2"); asm(" nilz r3,r2,3"); asm(" beqx 0f"); asm(" nilo r2,r2,0xfffc"); /* clear low bits */ asm(" sis r3,2"); /* test appropriate bytes of 1st word */ asm(" jeq 2f"); /* s & 3 == 2 */ asm(" jm 1f"); /* s & 3 == 1 */ asm(" j 3f"); /* s & 3 == 3 */ asm("0: srpi16 r4,8"); /* byte 0 */ asm(" jeq 4f"); asm("1: niuz r5,r4,0xff"); /* byte 1 */ asm(" jeq 5f"); asm("2: nilz r5,r4,0xff00"); /* byte 2 */ asm(" jeq 6f"); asm("3: sli16 r4,8"); /* byte 3 */ asm(" jeq 7f"); asm(" ls r4,4(r2)"); /* get next word and continue */ asm(" bx 0b"); asm(" inc r2,4"); asm("4: brx r15"); /* byte 0 is zero */ asm(" s r2,r0"); asm("5: s r2,r0"); /* byte 1 is zero */ asm(" brx r15"); asm(" inc r2,1"); asm("6: s r2,r0"); /* byte 2 is zero */ asm(" brx r15"); asm(" inc r2,2"); asm("7: s r2,r0"); /* byte 3 is zero */ asm(" brx r15"); asm(" inc r2,3"); asm(" .long 0xdf02df00"); /* trace table */ } #endif /* USE_LIBC_STRLEN */ #endif /* __GNUC__ || __HIGHC__ */ #endif /* ibm032 */