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/*
Unix SMB/CIFS implementation.
simple kerberos5 routines for active directory
Copyright (C) Andrew Tridgell 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
/*
we can't use krb5_mk_req because w2k wants the service to be in a particular format
*/
static krb5_error_code krb5_mk_req2(krb5_context context,
krb5_auth_context *auth_context,
const krb5_flags ap_req_options,
const char *principal,
krb5_ccache ccache,
krb5_data *outbuf)
{
krb5_error_code retval;
krb5_principal server;
krb5_creds * credsp;
krb5_creds creds;
krb5_data in_data;
retval = krb5_parse_name(context, principal, &server);
if (retval) {
DEBUG(1,("Failed to parse principal %s\n", principal));
return retval;
}
/* obtain ticket & session key */
memset((char *)&creds, 0, sizeof(creds));
if ((retval = krb5_copy_principal(context, server, &creds.server))) {
DEBUG(1,("krb5_copy_principal failed (%s)\n",
error_message(retval)));
goto cleanup_princ;
}
if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
DEBUG(1,("krb5_cc_get_principal failed (%s)\n",
error_message(retval)));
goto cleanup_creds;
}
if ((retval = krb5_get_credentials(context, 0,
ccache, &creds, &credsp))) {
DEBUG(1,("krb5_get_credentials failed for %s (%s)\n",
principal, error_message(retval)));
goto cleanup_creds;
}
/* cope with the ticket being in the future due to clock skew */
if ((unsigned)credsp->times.starttime > time(NULL)) {
time_t t = time(NULL);
int time_offset = (unsigned)credsp->times.starttime - t;
DEBUG(4,("Advancing clock by %d seconds to cope with clock skew\n", time_offset));
krb5_set_real_time(context, t + time_offset + 1, 0);
}
in_data.length = 0;
retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
&in_data, credsp, outbuf);
if (retval) {
DEBUG(1,("krb5_mk_req_extended failed (%s)\n",
error_message(retval)));
}
krb5_free_creds(context, credsp);
cleanup_creds:
krb5_free_cred_contents(context, &creds);
cleanup_princ:
krb5_free_principal(context, server);
return retval;
}
/*
get a kerberos5 ticket for the given service
*/
DATA_BLOB krb5_get_ticket(char *principal, time_t time_offset)
{
krb5_error_code retval;
krb5_data packet;
krb5_ccache ccdef;
krb5_context context;
krb5_auth_context auth_context = NULL;
DATA_BLOB ret;
krb5_enctype enc_types[] = {
#ifdef ENCTYPE_ARCFOUR_HMAC
ENCTYPE_ARCFOUR_HMAC,
#endif
ENCTYPE_DES_CBC_MD5,
ENCTYPE_NULL};
retval = krb5_init_context(&context);
if (retval) {
DEBUG(1,("krb5_init_context failed (%s)\n",
error_message(retval)));
goto failed;
}
if (time_offset != 0) {
krb5_set_real_time(context, time(NULL) + time_offset, 0);
}
if ((retval = krb5_cc_default(context, &ccdef))) {
DEBUG(1,("krb5_cc_default failed (%s)\n",
error_message(retval)));
goto failed;
}
if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
DEBUG(1,("krb5_set_default_tgs_ktypes failed (%s)\n",
error_message(retval)));
goto failed;
}
if ((retval = krb5_mk_req2(context,
&auth_context,
0,
principal,
ccdef, &packet))) {
goto failed;
}
ret = data_blob(packet.data, packet.length);
/* Hmm, heimdal dooesn't have this - what's the correct call? */
/* krb5_free_data_contents(context, &packet); */
krb5_free_context(context);
return ret;
failed:
if ( context )
krb5_free_context(context);
return data_blob(NULL, 0);
}
#else /* HAVE_KRB5 */
/* this saves a few linking headaches */
DATA_BLOB krb5_get_ticket(char *principal, time_t time_offset)
{
DEBUG(0,("NO KERBEROS SUPPORT\n"));
return data_blob(NULL, 0);
}
#endif
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