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/*
* lib/krb5/os/an_to_ln.c
*
* Copyright 1990,1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* 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.
*
*
* krb5_aname_to_localname()
*/
#include "k5-int.h"
#ifndef min
#define min(a,b) ((a) > (b) ? (b) : (a))
#endif /* min */
int krb5_lname_username_fallback = 1;
extern char *krb5_lname_file;
#ifndef _MSDOS
static krb5_error_code dbm_an_to_ln();
static krb5_error_code username_an_to_ln();
/*
Converts an authentication name to a local name suitable for use by
programs wishing a translation to an environment-specific name (e.g.
user account name).
lnsize specifies the maximum length name that is to be filled into
lname.
The translation will be null terminated in all non-error returns.
returns system errors, NOT_ENOUGH_SPACE
*/
krb5_error_code
krb5_aname_to_localname(context, aname, lnsize, lname)
krb5_context context;
krb5_const_principal aname;
const int lnsize;
char *lname;
{
struct stat statbuf;
if (!stat(krb5_lname_file,&statbuf))
return dbm_an_to_ln(context, aname, lnsize, lname);
if (krb5_lname_username_fallback)
return username_an_to_ln(context, aname, lnsize, lname);
return KRB5_LNAME_CANTOPEN;
}
/*
* Implementation: This version uses a DBM database, indexed by aname,
* to generate a lname.
*
* The entries in the database are normal C strings, and include the trailing
* null in the DBM datum.size.
*/
static krb5_error_code
dbm_an_to_ln(context, aname, lnsize, lname)
krb5_context context;
krb5_const_principal aname;
const int lnsize;
char *lname;
{
DBM *db;
krb5_error_code retval;
datum key, contents;
char *princ_name;
if (retval = krb5_unparse_name(context, aname, &princ_name))
return(retval);
key.dptr = princ_name;
key.dsize = strlen(princ_name)+1; /* need to store the NULL for
decoding */
db = dbm_open(krb5_lname_file, O_RDONLY, 0600);
if (!db) {
krb5_xfree(princ_name);
return KRB5_LNAME_CANTOPEN;
}
contents = dbm_fetch(db, key);
krb5_xfree(princ_name);
if (contents.dptr == NULL) {
retval = KRB5_LNAME_NOTRANS;
} else {
strncpy(lname, contents.dptr, lnsize);
if (lnsize < contents.dsize)
retval = KRB5_CONFIG_NOTENUFSPACE;
else if (lname[contents.dsize-1] != '\0')
retval = KRB5_LNAME_BADFORMAT;
else
retval = 0;
}
/* can't close until we copy the contents. */
(void) dbm_close(db);
return retval;
}
#endif /* _MSDOS */
/*
* Implementation: This version checks the realm to see if it is the local
* realm; if so, and there is exactly one non-realm component to the name,
* that name is returned as the lname.
*/
static krb5_error_code
username_an_to_ln(context, aname, lnsize, lname)
krb5_context context;
krb5_const_principal aname;
const int lnsize;
char *lname;
{
krb5_error_code retval;
char *def_realm;
int realm_length;
realm_length = krb5_princ_realm(context, aname)->length;
if (retval = krb5_get_default_realm(context, &def_realm)) {
return(retval);
}
if (((size_t) realm_length != strlen(def_realm)) ||
(memcmp(def_realm, krb5_princ_realm(context, aname)->data, realm_length))) {
free(def_realm);
return KRB5_LNAME_NOTRANS;
}
if (krb5_princ_size(context, aname) != 1) {
if (krb5_princ_size(context, aname) == 2 ) {
/* Check to see if 2nd component is the local realm. */
if ( strncmp(krb5_princ_component(context, aname,1)->data,def_realm,
realm_length) ||
realm_length != krb5_princ_component(context, aname,1)->length)
return KRB5_LNAME_NOTRANS;
}
else
/* no components or more than one component to non-realm part of name
--no translation. */
return KRB5_LNAME_NOTRANS;
}
free(def_realm);
strncpy(lname, krb5_princ_component(context, aname,0)->data,
min(krb5_princ_component(context, aname,0)->length,lnsize));
if (lnsize < krb5_princ_component(context, aname,0)->length ) {
retval = KRB5_CONFIG_NOTENUFSPACE;
} else {
lname[krb5_princ_component(context, aname,0)->length] = '\0';
retval = 0;
}
return retval;
}
#ifdef _MSDOS
krb5_error_code INTERFACE
krb5_aname_to_localname(context, aname, lnsize, lname)
krb5_context context;
krb5_const_principal aname;
const int lnsize;
char *lname;
{
if (krb5_lname_username_fallback)
return username_an_to_ln(context, aname, lnsize, lname);
return KRB5_LNAME_CANTOPEN;
}
#endif /* _MSDOS */
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