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/*
Unix SMB/CIFS implementation.
kerberos utility library
Copyright (C) Andrew Tridgell 2001
Copyright (C) Remus Koos 2001
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#ifdef HAVE_KRB5
/*
verify an incoming ticket and parse out the principal name and
authorization_data if available
*/
NTSTATUS ads_verify_ticket(ADS_STRUCT *ads, const DATA_BLOB *ticket,
char **principal, DATA_BLOB *auth_data)
{
krb5_context context;
krb5_auth_context auth_context = NULL;
krb5_keytab keytab = NULL;
krb5_data packet;
krb5_ticket *tkt = NULL;
krb5_data salt;
krb5_encrypt_block eblock;
int ret, i;
krb5_keyblock * key;
krb5_principal host_princ;
char *host_princ_s;
extern pstring global_myname;
fstring myname;
char *password_s;
krb5_data password;
krb5_enctype *enctypes = NULL;
if (!secrets_init()) {
DEBUG(1,("secrets_init failed\n"));
return NT_STATUS_LOGON_FAILURE;
}
password_s = secrets_fetch_machine_password();
if (!password_s) {
DEBUG(1,("failed to fetch machine password\n"));
return NT_STATUS_LOGON_FAILURE;
}
password.data = password_s;
password.length = strlen(password_s);
ret = krb5_init_context(&context);
if (ret) {
DEBUG(1,("krb5_init_context failed (%s)\n", error_message(ret)));
return NT_STATUS_LOGON_FAILURE;
}
ret = krb5_set_default_realm(context, ads->auth.realm);
if (ret) {
DEBUG(1,("krb5_set_default_realm failed (%s)\n", error_message(ret)));
return NT_STATUS_LOGON_FAILURE;
}
/* this whole process is far more complex than I would
like. We have to go through all this to allow us to store
the secret internally, instead of using /etc/krb5.keytab */
ret = krb5_auth_con_init(context, &auth_context);
if (ret) {
DEBUG(1,("krb5_auth_con_init failed (%s)\n", error_message(ret)));
return NT_STATUS_LOGON_FAILURE;
}
fstrcpy(myname, global_myname);
strlower(myname);
asprintf(&host_princ_s, "HOST/%s@%s", myname, lp_realm());
ret = krb5_parse_name(context, host_princ_s, &host_princ);
if (ret) {
DEBUG(1,("krb5_parse_name(%s) failed (%s)\n", host_princ_s, error_message(ret)));
return NT_STATUS_LOGON_FAILURE;
}
ret = krb5_principal2salt(context, host_princ, &salt);
if (ret) {
DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
return NT_STATUS_LOGON_FAILURE;
}
if (!(key = (krb5_keyblock *)malloc(sizeof(*key)))) {
return NT_STATUS_NO_MEMORY;
}
if ((ret = krb5_get_permitted_enctypes(context, &enctypes))) {
DEBUG(1,("krb5_get_permitted_enctypes failed (%s)\n",
error_message(ret)));
return NT_STATUS_LOGON_FAILURE;
}
/* we need to setup a auth context with each possible encoding type in turn */
for (i=0;enctypes[i];i++) {
krb5_use_enctype(context, &eblock, enctypes[i]);
ret = krb5_string_to_key(context, &eblock, key, &password, &salt);
if (ret) {
continue;
}
krb5_auth_con_setuseruserkey(context, auth_context, key);
packet.length = ticket->length;
packet.data = (krb5_pointer)ticket->data;
if (!(ret = krb5_rd_req(context, &auth_context, &packet,
NULL, keytab, NULL, &tkt))) {
krb5_free_ktypes(context, enctypes);
break;
}
}
if (!enctypes[i]) {
DEBUG(3,("krb5_rd_req with auth failed (%s)\n",
error_message(ret)));
return NT_STATUS_LOGON_FAILURE;
}
#if 0
file_save("/tmp/ticket.dat", ticket->data, ticket->length);
#endif
if (tkt->enc_part2) {
*auth_data = data_blob(tkt->enc_part2->authorization_data[0]->contents,
tkt->enc_part2->authorization_data[0]->length);
}
#if 0
if (tkt->enc_part2) {
file_save("/tmp/authdata.dat",
tkt->enc_part2->authorization_data[0]->contents,
tkt->enc_part2->authorization_data[0]->length);
}
#endif
if ((ret = krb5_unparse_name(context, tkt->enc_part2->client, principal))) {
DEBUG(3,("krb5_unparse_name failed (%s)\n",
error_message(ret)));
return NT_STATUS_LOGON_FAILURE;
}
return NT_STATUS_OK;
}
#endif
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