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/*
* lib/kadm/keysalt.c
*
* Copyright 1995 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.
*
*/
/*
* keysalt.c - Routines to handle key/salt tuples.
*/
#include "k5-int.h"
#include "adm.h"
#include "adm_proto.h"
static const char default_tupleseps[] = ", \t";
static const char default_ksaltseps[] = ":.";
/*
* krb5_keysalt_is_present() - Determine if a key/salt pair is present
* in a list of key/salt tuples.
*
* Salttype may be negative to indicate a search for only a enctype.
*/
krb5_boolean
krb5_keysalt_is_present(ksaltlist, nksalts, enctype, salttype)
krb5_key_salt_tuple *ksaltlist;
krb5_int32 nksalts;
krb5_enctype enctype;
krb5_int32 salttype;
{
krb5_boolean foundit;
int i;
foundit = 0;
if (ksaltlist) {
for (i=0; i<nksalts; i++) {
if ((ksaltlist[i].ks_enctype == enctype) &&
((ksaltlist[i].ks_salttype == salttype) ||
(salttype < 0))) {
foundit = 1;
break;
}
}
}
return(foundit);
}
/*
* krb5_keysalt_iterate() - Do something for each unique key/salt
* combination.
*
* If ignoresalt set, then salttype is ignored.
*/
krb5_error_code
krb5_keysalt_iterate(ksaltlist, nksalt, ignoresalt, iterator, arg)
krb5_key_salt_tuple *ksaltlist;
krb5_int32 nksalt;
krb5_boolean ignoresalt;
krb5_error_code (*iterator) KRB5_NPROTOTYPE((krb5_key_salt_tuple *,
krb5_pointer));
krb5_pointer arg;
{
int i;
krb5_error_code kret;
krb5_key_salt_tuple scratch;
kret = 0;
for (i=0; i<nksalt; i++) {
scratch.ks_enctype = ksaltlist[i].ks_enctype;
scratch.ks_salttype = (ignoresalt) ? -1 : ksaltlist[i].ks_salttype;
if (!krb5_keysalt_is_present(ksaltlist,
i,
scratch.ks_enctype,
scratch.ks_salttype)) {
if (kret = (*iterator)(&scratch, arg))
break;
}
}
return(kret);
}
/*
* krb5_string_to_keysalts() - Convert a string representation to a list
* of key/salt tuples.
*/
krb5_error_code
krb5_string_to_keysalts(string, tupleseps, ksaltseps, dups, ksaltp, nksaltp)
char *string;
const char *tupleseps;
const char *ksaltseps;
krb5_boolean dups;
krb5_key_salt_tuple **ksaltp;
krb5_int32 *nksaltp;
{
krb5_error_code kret;
char *kp, *sp, *ep;
char sepchar, trailchar;
krb5_enctype ktype;
krb5_int32 stype;
krb5_key_salt_tuple *savep;
const char *tseplist;
const char *ksseplist;
const char *septmp;
size_t len;
kret = 0;
kp = string;
tseplist = (tupleseps) ? tupleseps : default_tupleseps;
ksseplist = (ksaltseps) ? ksaltseps : default_ksaltseps;
while (kp) {
/* Attempt to find a separator */
ep = (char *) NULL;
if (*tseplist) {
septmp = tseplist;
for (ep = strchr(kp, (int) *septmp);
*(++septmp) && !ep;
ep = strchr(kp, (int) *septmp));
}
if (ep) {
trailchar = *ep;
*ep = '\0';
ep++;
}
/*
* kp points to something (hopefully) of the form:
* <enctype><ksseplist><salttype>
* or
* <enctype>
*/
sp = (char *) NULL;
/* Attempt to find a separator */
septmp = ksseplist;
for (sp = strchr(kp, (int) *septmp);
*(++septmp) && !sp;
ep = strchr(kp, (int) *septmp));
if (sp) {
/* Separate enctype from salttype */
sepchar = *sp;
*sp = '\0';
sp++;
}
else
stype = -1;
/*
* Attempt to parse enctype and salttype. If we parse well
* then make sure that it specifies a unique key/salt combo
*/
if (!krb5_string_to_enctype(kp, &ktype) &&
(!sp || !krb5_string_to_salttype(sp, &stype)) &&
(dups ||
!krb5_keysalt_is_present(*ksaltp, *nksaltp, ktype, stype))) {
/* Squirrel away old keysalt array */
savep = *ksaltp;
len = (size_t) *nksaltp;
/* Get new keysalt array */
if (*ksaltp = (krb5_key_salt_tuple *)
malloc((len + 1) * sizeof(krb5_key_salt_tuple))) {
/* Copy old keysalt if appropriate */
if (savep) {
memcpy(*ksaltp, savep,
len * sizeof(krb5_key_salt_tuple));
krb5_xfree(savep);
}
/* Save our values */
(*ksaltp)[(*nksaltp)].ks_enctype = ktype;
(*ksaltp)[(*nksaltp)].ks_salttype = stype;
(*nksaltp)++;
}
else {
*ksaltp = savep;
break;
}
}
if (sp)
sp[-1] = sepchar;
if (ep)
ep[-1] = trailchar;
kp = ep;
}
return(kret);
}
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