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/* $OpenBSD: kntoln.c,v 1.7 1998/05/17 13:53:48 art Exp $ */
/* $KTH: kntoln.c,v 1.8 1997/12/11 15:00:11 bg Exp $ */
/*
* This source code is no longer held under any constraint of USA
* `cryptographic laws' since it was exported legally. The cryptographic
* functions were removed from the code and a "Bones" distribution was
* made. A Commodity Jurisdiction Request #012-94 was filed with the
* USA State Department, who handed it to the Commerce department. The
* code was determined to fall under General License GTDA under ECCN 5D96G,
* and hence exportable. The cryptographic interfaces were re-added by Eric
* Young, and then KTH proceeded to maintain the code in the free world.
*
*/
/*
* Copyright (C) 1989 by the Massachusetts Institute of Technology
*
* Export of this software from the United States of America is assumed
* to require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*/
/*
* krb_kntoln converts an auth name into a local name by looking up
* the auth name in the /etc/aname file. The format of the aname
* file is:
*
* +-----+-----+-----+-----+------+----------+-------+-------+
* | anl | inl | rll | lnl | name | instance | realm | lname |
* +-----+-----+-----+-----+------+----------+-------+-------+
* | 1by | 1by | 1by | 1by | name | instance | realm | lname |
* +-----+-----+-----+-----+------+----------+-------+-------+
*
* If the /etc/aname file can not be opened it will set the
* local name to the auth name. Thus, in this case it performs as
* the identity function.
*
* The name instance and realm are passed to krb_kntoln through
* the AUTH_DAT structure (ad).
*
* Now here's what it *really* does:
*
* Given a Kerberos name in an AUTH_DAT structure, check that the
* instance is null, and that the realm is the same as the local
* realm, and return the principal's name in "lname". Return
* KSUCCESS if all goes well, otherwise KFAILURE.
*/
#include "krb_locl.h"
int
krb_kntoln(AUTH_DAT *ad, char *lname)
{
static char lrealm[REALM_SZ] = "";
if (ad == NULL || lname == NULL)
return KFAILURE;
if (!(*lrealm) && (krb_get_lrealm(lrealm,1) == KFAILURE))
return(KFAILURE);
if (strcmp(ad->pinst, ""))
return(KFAILURE);
if (strcmp(ad->prealm, lrealm))
return(KFAILURE);
strncpy(lname, ad->pname, ANAME_SZ);
lname[ANAME_SZ-1] = '\0';
return(KSUCCESS);
}
#if 0
/* Posted to usenet by "Derrick J. Brashear" <shadow+@andrew.cmu.edu> */
#include <krb.h>
#include <ndbm.h>
#include <stdio.h>
#include <sys/file.h>
#include <strings.h>
#include <sys/syslog.h>
#include <sys/errno.h>
extern int errno;
/*
* antoln converts an authentication name into a local name by looking up
* the authentication name in the /etc/aname dbm database.
*
* If the /etc/aname file can not be opened it will set the
* local name to the principal name. Thus, in this case it performs as
* the identity function.
*
* The name instance and realm are passed to antoln through
* the AUTH_DAT structure (ad).
*/
static char lrealm[REALM_SZ] = "";
int
an_to_ln(AUTH_DAT *ad,
char *lname)
{
static DBM *aname = NULL;
char keyname[ANAME_SZ+INST_SZ+REALM_SZ+2];
if(!(*lrealm) && (krb_get_lrealm(lrealm,1) == KFAILURE))
return(KFAILURE);
if((strcmp(ad->pinst,"") && strcmp(ad->pinst,"root")) ||
strcmp(ad->prealm,lrealm)) {
datum val;
datum key;
/*
* Non-local name (or) non-null and non-root instance.
* Look up in dbm file.
*/
if (!aname) {
if ((aname = dbm_open("/etc/aname", O_RDONLY, 0))
== NULL) return (KFAILURE);
}
/* Construct dbm lookup key. */
an_to_a(ad, keyname);
key.dptr = keyname;
key.dsize = strlen(keyname)+1;
flock(dbm_dirfno(aname), LOCK_SH);
val = dbm_fetch(aname, key);
flock(dbm_dirfno(aname), LOCK_UN);
if (!val.dptr) {
dbm_close(aname);
return(KFAILURE);
}
/* Got it! */
strncpy(lname, val.dptr, ANAME_SZ);
lname[ANAME_SZ-1] = '\0';
return(KSUCCESS);
} else{
strncpy(lname, ad->pname, ANAME_SZ);
lname[ANAME_SZ-1] = '\0';
}
return(KSUCCESS);
}
int
an_to_a(AUTH_DAT *ad,
char *str)
{
strncpy(str, ad->pname, ANAME_SZ);
str[ANAME_SZ-1] = '\0';
if(*ad->pinst) {
strcat(str, ".");
strcat(str, ad->pinst);
}
strcat(str, "@");
strcat(str, ad->prealm);
}
/*
* Parse a string of the form "user[.instance][@realm]"
* into a struct AUTH_DAT.
*/
int
a_to_an(char *str, AUTH_DAT *ad)
{
char *buf = (char *)malloc(strlen(str)+1);
char *rlm, *inst, *princ;
if (buf == NULL)
return KFAILURE;
if(!(*lrealm) && (krb_get_lrealm(lrealm,1) == KFAILURE)) {
free(buf);
buf = NULL;
return(KFAILURE);
}
/* destructive string hacking is more fun.. */
strncpy(buf, str, strlen(str)+1);
buf[strlen(str)] = '\0';
if (rlm = index(buf, '@')) {
*rlm++ = '\0';
}
if (inst = index(buf, '.')) {
*inst++ = '\0';
}
strcpy(ad->pname, buf);
if(inst) strcpy(ad->pinst, inst);
else *ad->pinst = '\0';
if (rlm) strcpy(ad->prealm, rlm);
else strcpy(ad->prealm, lrealm);
free(buf);
buf = NULL;
return(KSUCCESS);
}
#endif
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