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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* lib/krb5/ccache/ser_rc.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. 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.
*
*/
/*
* ser_rcdfl.c - Serialize replay cache context.
*/
#include "k5-int.h"
/*
* Routines to deal with externalizing krb5_ccache.
* krb5_ccache_size();
* krb5_ccache_externalize();
* krb5_ccache_internalize();
*/
static krb5_error_code krb5_ccache_size
(krb5_context, krb5_pointer, size_t *);
static krb5_error_code krb5_ccache_externalize
(krb5_context, krb5_pointer, krb5_octet **, size_t *);
static krb5_error_code krb5_ccache_internalize
(krb5_context,krb5_pointer *, krb5_octet **, size_t *);
/*
* Serialization entry for this type.
*/
static const krb5_ser_entry krb5_ccache_ser_entry = {
KV5M_CCACHE, /* Type */
krb5_ccache_size, /* Sizer routine */
krb5_ccache_externalize, /* Externalize routine */
krb5_ccache_internalize /* Internalize routine */
};
/*
* krb5_ccache_size() - Determine the size required to externalize
* this krb5_ccache variant.
*/
static krb5_error_code
krb5_ccache_size(krb5_context kcontext, krb5_pointer arg, size_t *sizep)
{
krb5_error_code kret;
krb5_ccache ccache;
size_t required;
kret = EINVAL;
if ((ccache = (krb5_ccache) arg)) {
/*
* Saving FILE: variants of krb5_ccache requires at minimum:
* krb5_int32 for KV5M_CCACHE
* krb5_int32 for length of ccache name.
* krb5_int32 for KV5M_CCACHE
*/
required = sizeof(krb5_int32) * 3;
if (ccache->ops->prefix)
required += (strlen(ccache->ops->prefix)+1);
/*
* The ccache name is formed as follows:
* <prefix>:<name>
*/
required += strlen(krb5_cc_get_name(kcontext, ccache));
kret = 0;
*sizep += required;
}
return(kret);
}
/*
* krb5_ccache_externalize() - Externalize the krb5_ccache.
*/
static krb5_error_code
krb5_ccache_externalize(krb5_context kcontext, krb5_pointer arg, krb5_octet **buffer, size_t *lenremain)
{
krb5_error_code kret;
krb5_ccache ccache;
size_t required;
krb5_octet *bp;
size_t remain;
char *ccname;
const char *fnamep;
required = 0;
bp = *buffer;
remain = *lenremain;
kret = EINVAL;
if ((ccache = (krb5_ccache) arg)) {
kret = ENOMEM;
if (!krb5_ccache_size(kcontext, arg, &required) &&
(required <= remain)) {
/* Our identifier */
(void) krb5_ser_pack_int32(KV5M_CCACHE, &bp, &remain);
fnamep = krb5_cc_get_name(kcontext, ccache);
if (ccache->ops->prefix) {
if (asprintf(&ccname, "%s:%s", ccache->ops->prefix, fnamep) < 0)
ccname = NULL;
} else
ccname = strdup(fnamep);
if (ccname) {
/* Put the length of the file name */
(void) krb5_ser_pack_int32((krb5_int32) strlen(ccname),
&bp, &remain);
/* Put the name */
(void) krb5_ser_pack_bytes((krb5_octet *) ccname,
strlen(ccname),
&bp, &remain);
/* Put the trailer */
(void) krb5_ser_pack_int32(KV5M_CCACHE, &bp, &remain);
kret = 0;
*buffer = bp;
*lenremain = remain;
free(ccname);
}
}
}
return(kret);
}
/*
* krb5_ccache_internalize() - Internalize the krb5_ccache.
*/
static krb5_error_code
krb5_ccache_internalize(krb5_context kcontext, krb5_pointer *argp, krb5_octet **buffer, size_t *lenremain)
{
krb5_error_code kret;
krb5_ccache ccache;
krb5_int32 ibuf;
krb5_octet *bp;
size_t remain;
char *ccname = NULL;
*argp = NULL;
bp = *buffer;
remain = *lenremain;
/* Read our magic number. */
kret = krb5_ser_unpack_int32(&ibuf, &bp, &remain);
if (kret)
return kret;
if (ibuf != KV5M_CCACHE)
return EINVAL;
/* Unpack and validate the length of the ccache name. */
kret = krb5_ser_unpack_int32(&ibuf, &bp, &remain);
if (kret)
return kret;
if (ibuf < 0 || (krb5_ui_4) ibuf > remain)
return EINVAL;
/* Allocate and unpack the name. */
ccname = malloc(ibuf + 1);
if (!ccname)
return ENOMEM;
kret = krb5_ser_unpack_bytes((krb5_octet *) ccname, (size_t) ibuf,
&bp, &remain);
if (kret)
goto cleanup;
ccname[ibuf] = '\0';
/* Read the second magic number. */
kret = krb5_ser_unpack_int32(&ibuf, &bp, &remain);
if (kret)
goto cleanup;
if (ibuf != KV5M_CCACHE) {
kret = EINVAL;
goto cleanup;
}
/* Resolve the named credential cache. */
kret = krb5_cc_resolve(kcontext, ccname, &ccache);
if (kret)
goto cleanup;
*buffer = bp;
*lenremain = remain;
*argp = ccache;
cleanup:
free(ccname);
return(kret);
}
/*
* Register the ccache serializer.
*/
krb5_error_code KRB5_CALLCONV
krb5_ser_ccache_init(krb5_context kcontext)
{
return(krb5_register_serializer(kcontext, &krb5_ccache_ser_entry));
}
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