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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/ser_auth.c - Serialize krb5_authenticator structure */
/*
* Copyright 1995, 2008 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. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* 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.
*/
#ifndef LEAN_CLIENT
#include "k5-int.h"
#include "int-proto.h"
/*
* Routines to deal with externalizing the krb5_authenticator:
* krb5_authenticator_size();
* krb5_authenticator_externalize();
* krb5_authenticator_internalize();
*/
static krb5_error_code krb5_authenticator_size
(krb5_context, krb5_pointer, size_t *);
static krb5_error_code krb5_authenticator_externalize
(krb5_context, krb5_pointer, krb5_octet **, size_t *);
static krb5_error_code krb5_authenticator_internalize
(krb5_context,krb5_pointer *, krb5_octet **, size_t *);
/* Local data */
static const krb5_ser_entry krb5_authenticator_ser_entry = {
KV5M_AUTHENTICATOR, /* Type */
krb5_authenticator_size, /* Sizer routine */
krb5_authenticator_externalize, /* Externalize routine */
krb5_authenticator_internalize /* Internalize routine */
};
/*
* krb5_authenticator_size() - Determine the size required to externalize
* the krb5_authenticator.
*/
static krb5_error_code
krb5_authenticator_size(krb5_context kcontext, krb5_pointer arg, size_t *sizep)
{
krb5_error_code kret;
krb5_authenticator *authenticator;
size_t required;
/*
* krb5_authenticator requires at minimum:
* krb5_int32 for KV5M_AUTHENTICATOR
* krb5_int32 for seconds
* krb5_int32 for cusec
* krb5_int32 for seq_number
* krb5_int32 for number in authorization_data array.
* krb5_int32 for KV5M_AUTHENTICATOR
*/
kret = EINVAL;
if ((authenticator = (krb5_authenticator *) arg)) {
required = sizeof(krb5_int32)*6;
/* Calculate size required by client, if appropriate */
if (authenticator->client)
kret = krb5_size_opaque(kcontext,
KV5M_PRINCIPAL,
(krb5_pointer) authenticator->client,
&required);
else
kret = 0;
/* Calculate size required by checksum, if appropriate */
if (!kret && authenticator->checksum)
kret = krb5_size_opaque(kcontext,
KV5M_CHECKSUM,
(krb5_pointer) authenticator->checksum,
&required);
/* Calculate size required by subkey, if appropriate */
if (!kret && authenticator->subkey)
kret = krb5_size_opaque(kcontext,
KV5M_KEYBLOCK,
(krb5_pointer) authenticator->subkey,
&required);
/* Calculate size required by authorization_data, if appropriate */
if (!kret && authenticator->authorization_data) {
int i;
for (i=0; !kret && authenticator->authorization_data[i]; i++) {
kret = krb5_size_opaque(kcontext,
KV5M_AUTHDATA,
(krb5_pointer) authenticator->
authorization_data[i],
&required);
}
}
}
if (!kret)
*sizep += required;
return(kret);
}
/*
* krb5_authenticator_externalize() - Externalize the krb5_authenticator.
*/
static krb5_error_code
krb5_authenticator_externalize(krb5_context kcontext, krb5_pointer arg, krb5_octet **buffer, size_t *lenremain)
{
krb5_error_code kret;
krb5_authenticator *authenticator;
size_t required;
krb5_octet *bp;
size_t remain;
int i;
required = 0;
bp = *buffer;
remain = *lenremain;
kret = EINVAL;
if ((authenticator = (krb5_authenticator *) arg)) {
kret = ENOMEM;
if (!krb5_authenticator_size(kcontext, arg, &required) &&
(required <= remain)) {
/* First write our magic number */
(void) krb5_ser_pack_int32(KV5M_AUTHENTICATOR, &bp, &remain);
/* Now ctime */
(void) krb5_ser_pack_int32((krb5_int32) authenticator->ctime,
&bp, &remain);
/* Now cusec */
(void) krb5_ser_pack_int32((krb5_int32) authenticator->cusec,
&bp, &remain);
/* Now seq_number */
(void) krb5_ser_pack_int32(authenticator->seq_number,
&bp, &remain);
/* Now handle client, if appropriate */
if (authenticator->client)
kret = krb5_externalize_opaque(kcontext,
KV5M_PRINCIPAL,
(krb5_pointer)
authenticator->client,
&bp,
&remain);
else
kret = 0;
/* Now handle checksum, if appropriate */
if (!kret && authenticator->checksum)
kret = krb5_externalize_opaque(kcontext,
KV5M_CHECKSUM,
(krb5_pointer)
authenticator->checksum,
&bp,
&remain);
/* Now handle subkey, if appropriate */
if (!kret && authenticator->subkey)
kret = krb5_externalize_opaque(kcontext,
KV5M_KEYBLOCK,
(krb5_pointer)
authenticator->subkey,
&bp,
&remain);
/* Now handle authorization_data, if appropriate */
if (!kret) {
if (authenticator->authorization_data)
for (i=0; authenticator->authorization_data[i]; i++);
else
i = 0;
(void) krb5_ser_pack_int32((krb5_int32) i, &bp, &remain);
/* Now pound out the authorization_data */
if (authenticator->authorization_data) {
for (i=0; !kret && authenticator->authorization_data[i];
i++)
kret = krb5_externalize_opaque(kcontext,
KV5M_AUTHDATA,
(krb5_pointer)
authenticator->
authorization_data[i],
&bp,
&remain);
}
}
/*
* If we were successful, write trailer then update the pointer and
* remaining length;
*/
if (!kret) {
/* Write our trailer */
(void) krb5_ser_pack_int32(KV5M_AUTHENTICATOR, &bp, &remain);
*buffer = bp;
*lenremain = remain;
}
}
}
return(kret);
}
/*
* krb5_authenticator_internalize() - Internalize the krb5_authenticator.
*/
static krb5_error_code
krb5_authenticator_internalize(krb5_context kcontext, krb5_pointer *argp, krb5_octet **buffer, size_t *lenremain)
{
krb5_error_code kret;
krb5_authenticator *authenticator;
krb5_int32 ibuf;
krb5_octet *bp;
size_t remain;
int i;
krb5_int32 nadata;
size_t len;
bp = *buffer;
remain = *lenremain;
kret = EINVAL;
/* Read our magic number */
if (krb5_ser_unpack_int32(&ibuf, &bp, &remain))
ibuf = 0;
if (ibuf == KV5M_AUTHENTICATOR) {
kret = ENOMEM;
/* Get memory for the authenticator */
if ((remain >= (3*sizeof(krb5_int32))) &&
(authenticator = (krb5_authenticator *)
calloc(1, sizeof(krb5_authenticator)))) {
/* Get ctime */
(void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
authenticator->ctime = (krb5_timestamp) ibuf;
/* Get cusec */
(void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
authenticator->cusec = ibuf;
/* Get seq_number */
(void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
authenticator->seq_number = ibuf;
kret = 0;
/* Attempt to read in the client */
kret = krb5_internalize_opaque(kcontext,
KV5M_PRINCIPAL,
(krb5_pointer *)
&authenticator->client,
&bp,
&remain);
if (kret == EINVAL)
kret = 0;
/* Attempt to read in the checksum */
if (!kret) {
kret = krb5_internalize_opaque(kcontext,
KV5M_CHECKSUM,
(krb5_pointer *)
&authenticator->checksum,
&bp,
&remain);
if (kret == EINVAL)
kret = 0;
}
/* Attempt to read in the subkey */
if (!kret) {
kret = krb5_internalize_opaque(kcontext,
KV5M_KEYBLOCK,
(krb5_pointer *)
&authenticator->subkey,
&bp,
&remain);
if (kret == EINVAL)
kret = 0;
}
/* Attempt to read in the authorization data count */
if (!(kret = krb5_ser_unpack_int32(&ibuf, &bp, &remain))) {
nadata = ibuf;
len = (size_t) (nadata + 1);
/* Get memory for the authorization data pointers */
if ((authenticator->authorization_data = (krb5_authdata **)
calloc(len, sizeof(krb5_authdata *)))) {
for (i=0; !kret && (i<nadata); i++) {
kret = krb5_internalize_opaque(kcontext,
KV5M_AUTHDATA,
(krb5_pointer *)
&authenticator->
authorization_data[i],
&bp,
&remain);
}
/* Finally, find the trailer */
if (!kret) {
kret = krb5_ser_unpack_int32(&ibuf, &bp, &remain);
if (!kret && (ibuf == KV5M_AUTHENTICATOR))
authenticator->magic = KV5M_AUTHENTICATOR;
else
kret = EINVAL;
}
}
}
if (!kret) {
*buffer = bp;
*lenremain = remain;
*argp = (krb5_pointer) authenticator;
}
else
krb5_free_authenticator(kcontext, authenticator);
}
}
return(kret);
}
/*
* Register the authenticator serializer.
*/
krb5_error_code
krb5_ser_authenticator_init(krb5_context kcontext)
{
return(krb5_register_serializer(kcontext, &krb5_authenticator_ser_entry));
}
#endif
|
