diff options
Diffstat (limited to 'eBones/krb/rd_req.c')
| -rw-r--r-- | eBones/krb/rd_req.c | 331 |
1 files changed, 0 insertions, 331 deletions
diff --git a/eBones/krb/rd_req.c b/eBones/krb/rd_req.c deleted file mode 100644 index 60ee9483d30c..000000000000 --- a/eBones/krb/rd_req.c +++ /dev/null @@ -1,331 +0,0 @@ -/* - * Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute - * of Technology. - * For copying and distribution information, please see the file - * <Copyright.MIT>. - * - * from: der: rd_req.c,v 4.16 89/03/22 14:52:06 jtkohl Exp $ - * $Id: rd_req.c,v 1.3 1995/07/18 16:39:33 mark Exp $ - */ - -#if 0 -#ifndef lint -static char *rcsid = -"$Id: rd_req.c,v 1.3 1995/07/18 16:39:33 mark Exp $"; -#endif /* lint */ -#endif - -#include <des.h> -#include <krb.h> -#include <prot.h> -#include <sys/time.h> -#include <strings.h> - -extern int krb_ap_req_debug; - -static struct timeval t_local = { 0, 0 }; - -/* - * Keep the following information around for subsequent calls - * to this routine by the same server using the same key. - */ - -static Key_schedule serv_key; /* Key sched to decrypt ticket */ -static C_Block ky; /* 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 */ - -/* - * 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 static variable "ky". A key schedule is - * generated for "ky" and returned in the external static variable - * "serv_key". - * - * 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 - bzero(ky, sizeof(ky)); - return KSUCCESS; -#else - if (cvt) - string_to_key(key,(C_Block *)ky); - else - bcopy(key,(char *)ky,8); - return(des_key_sched((C_Block *)ky,serv_key)); -#endif -} - - -/* - * 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. - */ - -int -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 */ -{ - static KTEXT_ST ticket; /* Temp storage for ticket */ - static KTEXT tkt = &ticket; - static KTEXT_ST req_id_st; /* Temp storage for authenticator */ - register KTEXT req_id = &req_id_st; - - char realm[REALM_SZ]; /* Realm of issuing kerberos */ - static Key_schedule seskey_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 */ - static int swap_bytes; /* Need to swap bytes? */ - static int mutual; /* Mutual authentication requested? */ - static 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,s_kvno,fn,(char *)skey)) - return(RD_AP_UNDEC); - if ((status=krb_set_key((char *)skey,0))) return(status); -#endif - (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); - bcopy(ptr+1,(char *)(tkt->dat),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,ky,serv_key)) - 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); - bcopy(ptr + tkt->length, (char *)(req_id->dat),req_id->length); - -#ifndef NOENCRYPTION - key_sched((C_Block *)ad->session,seskey_sched); - pcbc_encrypt((C_Block *)req_id->dat,(C_Block *)req_id->dat, - (long)req_id->length,seskey_sched,(C_Block *)ad->session,DES_DECRYPT); -#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(); - bcopy(ptr,(char *)&ad->checksum,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 ?? */ - bcopy(ptr,(char *)&r_time_sec,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); - - (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); -} |