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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* plugins/authdata/greet_server/greet_auth.c */
/*
* Copyright 2009 by the Massachusetts Institute of Technology.
*
* 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.
*/
/*
*
* Sample authorization data plugin
*/
#include <k5-int.h>
#include <krb5/authdata_plugin.h>
#include <kdb.h>
static krb5_error_code
greet_init(krb5_context ctx, void **blob)
{
return 0;
}
static void
greet_fini(krb5_context ctx, void *blob)
{
}
static krb5_error_code greet_hello(krb5_context context, krb5_data **ret)
{
krb5_data tmp;
tmp.data = "Hello, KDC issued acceptor world!";
tmp.length = strlen(tmp.data);
return krb5_copy_data(context, &tmp, ret);
}
static krb5_error_code
greet_kdc_verify(krb5_context context,
krb5_enc_tkt_part *enc_tkt_request,
krb5_data **greeting)
{
krb5_error_code code;
krb5_authdata **tgt_authdata = NULL;
krb5_authdata **kdc_issued = NULL;
krb5_authdata **greet = NULL;
code = krb5_find_authdata(context, enc_tkt_request->authorization_data,
NULL, KRB5_AUTHDATA_KDC_ISSUED, &tgt_authdata);
if (code != 0 || tgt_authdata == NULL)
return 0;
code = krb5_verify_authdata_kdc_issued(context,
enc_tkt_request->session,
tgt_authdata[0],
NULL,
&kdc_issued);
if (code != 0) {
krb5_free_authdata(context, tgt_authdata);
return code;
}
code = krb5_find_authdata(context, kdc_issued, NULL, -42, &greet);
if (code == 0) {
krb5_data tmp;
tmp.data = (char *)greet[0]->contents;
tmp.length = greet[0]->length;
code = krb5_copy_data(context, &tmp, greeting);
} else
code = 0;
krb5_free_authdata(context, tgt_authdata);
krb5_free_authdata(context, kdc_issued);
krb5_free_authdata(context, greet);
return code;
}
static krb5_error_code
greet_kdc_sign(krb5_context context,
krb5_enc_tkt_part *enc_tkt_reply,
krb5_const_principal tgs,
krb5_data *greeting)
{
krb5_error_code code;
krb5_authdata ad_datum, *ad_data[2], **kdc_issued = NULL;
krb5_authdata **if_relevant = NULL;
krb5_authdata **tkt_authdata;
ad_datum.ad_type = -42;
ad_datum.contents = (krb5_octet *)greeting->data;
ad_datum.length = greeting->length;
ad_data[0] = &ad_datum;
ad_data[1] = NULL;
code = krb5_make_authdata_kdc_issued(context,
enc_tkt_reply->session,
tgs,
ad_data,
&kdc_issued);
if (code != 0)
return code;
code = krb5_encode_authdata_container(context,
KRB5_AUTHDATA_IF_RELEVANT,
kdc_issued,
&if_relevant);
if (code != 0) {
krb5_free_authdata(context, kdc_issued);
return code;
}
code = krb5_merge_authdata(context,
if_relevant,
enc_tkt_reply->authorization_data,
&tkt_authdata);
if (code == 0) {
krb5_free_authdata(context, enc_tkt_reply->authorization_data);
enc_tkt_reply->authorization_data = tkt_authdata;
} else {
krb5_free_authdata(context, if_relevant);
}
krb5_free_authdata(context, kdc_issued);
return code;
}
static krb5_error_code
greet_authdata(krb5_context context,
unsigned int flags,
krb5_db_entry *client,
krb5_db_entry *server,
krb5_db_entry *tgs,
krb5_keyblock *client_key,
krb5_keyblock *server_key,
krb5_keyblock *krbtgt_key,
krb5_data *req_pkt,
krb5_kdc_req *request,
krb5_const_principal for_user_princ,
krb5_enc_tkt_part *enc_tkt_request,
krb5_enc_tkt_part *enc_tkt_reply)
{
krb5_error_code code;
krb5_data *greeting = NULL;
if (request->msg_type != KRB5_TGS_REQ)
return 0;
code = greet_hello(context, &greeting);
if (code != 0)
return code;
code = greet_kdc_sign(context, enc_tkt_reply, tgs->princ, greeting);
krb5_free_data(context, greeting);
return code;
}
krb5plugin_authdata_server_ftable_v2 authdata_server_2 = {
"greet",
greet_init,
greet_fini,
greet_authdata,
};
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