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/*
* lib/krb5/keytab/ktbase.c
*
* Copyright 1990 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.
*
*
* Registration functions for keytab.
*/
#include "k5-int.h"
struct krb5_kt_typelist
{
krb5_kt_ops *ops;
struct krb5_kt_typelist *next;
};
static struct krb5_kt_typelist krb5_kt_typelist_dfl = { &krb5_kt_dfl_ops, 0 };
static struct krb5_kt_typelist *kt_typehead = &krb5_kt_typelist_dfl;
/*
* Register a new key table type
* don't replace if it already exists; return an error instead.
*/
krb5_error_code
krb5_kt_register(context, ops)
krb5_context context;
krb5_kt_ops *ops;
{
struct krb5_kt_typelist *t;
for (t = kt_typehead;t && strcmp(t->ops->prefix,ops->prefix);t = t->next)
;
if (t) {
return KRB5_KT_TYPE_EXISTS;
}
if (!(t = (struct krb5_kt_typelist *) malloc(sizeof(*t))))
return ENOMEM;
t->next = kt_typehead;
t->ops = ops;
kt_typehead = t;
return 0;
}
/*
* Resolve a key table name into a keytab object.
*
* The name is currently constrained to be of the form "type:residual";
*
* The "type" portion corresponds to one of the registered key table
* types, while the "residual" portion is specific to the
* particular keytab type.
*/
krb5_error_code
krb5_kt_resolve (context, name, ktid)
krb5_context context;
const char *name;
krb5_keytab *ktid;
{
struct krb5_kt_typelist *tlist;
char *pfx, *resid, *cp;
int pfxlen;
cp = strchr (name, ':');
if (!cp) {
return (*krb5_kt_dfl_ops.resolve)(context, name, ktid);
}
pfxlen = cp - (char *)name;
resid = (char *)name + pfxlen + 1;
pfx = malloc (pfxlen+1);
if (!pfx)
return ENOMEM;
memcpy (pfx, name, pfxlen);
pfx[pfxlen] = '\0';
*ktid = (krb5_keytab) 0;
for (tlist = kt_typehead; tlist; tlist = tlist->next) {
if (strcmp (tlist->ops->prefix, pfx) == 0) {
free(pfx);
return (*tlist->ops->resolve)(context, resid, ktid);
}
}
free(pfx);
return KRB5_KT_UNKNOWN_TYPE;
}
/*
* Routines to deal with externalizingt krb5_keytab.
* krb5_keytab_size();
* krb5_keytab_externalize();
* krb5_keytab_internalize();
*/
static krb5_error_code krb5_keytab_size
KRB5_PROTOTYPE((krb5_context, krb5_pointer, size_t *));
static krb5_error_code krb5_keytab_externalize
KRB5_PROTOTYPE((krb5_context, krb5_pointer, krb5_octet **, size_t *));
static krb5_error_code krb5_keytab_internalize
KRB5_PROTOTYPE((krb5_context,krb5_pointer *, krb5_octet **, size_t *));
/*
* Serialization entry for this type.
*/
static const krb5_ser_entry krb5_keytab_ser_entry = {
KV5M_KEYTAB, /* Type */
krb5_keytab_size, /* Sizer routine */
krb5_keytab_externalize, /* Externalize routine */
krb5_keytab_internalize /* Internalize routine */
};
static krb5_error_code
krb5_keytab_size(kcontext, arg, sizep)
krb5_context kcontext;
krb5_pointer arg;
size_t *sizep;
{
krb5_error_code kret;
krb5_keytab keytab;
krb5_ser_handle shandle;
kret = EINVAL;
if ((keytab = (krb5_keytab) arg) &&
keytab->ops &&
(shandle = (krb5_ser_handle) keytab->ops->serializer) &&
shandle->sizer)
kret = (*shandle->sizer)(kcontext, arg, sizep);
return(kret);
}
static krb5_error_code
krb5_keytab_externalize(kcontext, arg, buffer, lenremain)
krb5_context kcontext;
krb5_pointer arg;
krb5_octet **buffer;
size_t *lenremain;
{
krb5_error_code kret;
krb5_keytab keytab;
krb5_ser_handle shandle;
kret = EINVAL;
if ((keytab = (krb5_keytab) arg) &&
keytab->ops &&
(shandle = (krb5_ser_handle) keytab->ops->serializer) &&
shandle->externalizer)
kret = (*shandle->externalizer)(kcontext, arg, buffer, lenremain);
return(kret);
}
static krb5_error_code
krb5_keytab_internalize(kcontext, argp, buffer, lenremain)
krb5_context kcontext;
krb5_pointer *argp;
krb5_octet **buffer;
size_t *lenremain;
{
krb5_error_code kret;
krb5_ser_handle shandle;
kret = EINVAL;
if ((shandle = (krb5_ser_handle) krb5_kt_dfl_ops.serializer) &&
shandle->internalizer)
kret = (*shandle->internalizer)(kcontext, argp, buffer, lenremain);
return(kret);
}
krb5_error_code
krb5_ser_keytab_init(kcontext)
krb5_context kcontext;
{
return(krb5_register_serializer(kcontext, &krb5_keytab_ser_entry));
}
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