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/* 
   Unix SMB/CIFS implementation.

   test suite for netlogon PAC operations

   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2008
   
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "torture/torture.h"
#include "lib/events/events.h"
#include "auth/auth.h"
#include "auth/gensec/gensec.h"
#include "lib/cmdline/popt_common.h"
#include "torture/rpc/rpc.h"
#include "torture/rpc/netlogon.h"
#include "libcli/auth/libcli_auth.h"
#include "librpc/gen_ndr/ndr_netlogon_c.h"
#include "librpc/gen_ndr/ndr_krb5pac.h"
#include "param/param.h"
#include "lib/messaging/irpc.h"
#include "cluster/cluster.h"

#include "system/kerberos.h"
#include "auth/kerberos/kerberos.h"
#include "librpc/gen_ndr/krb5pac.h"
#include <gssapi/gssapi.h>
#include <gssapi/gssapi_krb5.h>
#include "auth/gensec/gensec_gssapi.h"

#define TEST_MACHINE_NAME "torturepactest"

/* Check to see if we can pass the PAC across to the NETLOGON server for validation */

/* Also happens to be a really good one-step verfication of our Kerberos stack */

static bool test_PACVerify(struct torture_context *tctx, 
			   struct dcerpc_pipe *p,
			   struct cli_credentials *credentials)
{
	NTSTATUS status;

	struct netr_LogonSamLogon r;
	
	struct netr_GenericInfo generic;
	struct netr_Authenticator auth, auth2;
	

	struct creds_CredentialState *creds;
	struct gensec_security *gensec_client_context;
	struct gensec_security *gensec_server_context;
	struct gensec_gssapi_state *gensec_gssapi_state;

	struct messaging_context *msg_server_ctx;
	DATA_BLOB client_to_server, server_to_client, pac_blob, pac_wrapped;
	gss_buffer_desc pac;
	struct PAC_Validate pac_wrapped_struct;
	
	enum ndr_err_code ndr_err;

	struct auth_session_info *session_info;

	char *tmp_dir;
	OM_uint32 maj_stat, min_stat;

	TALLOC_CTX *tmp_ctx = talloc_new(tctx);
	
	torture_assert(tctx, tmp_ctx != NULL, "talloc_new() failed");

	if (!test_SetupCredentials2(p, tctx, NETLOGON_NEG_AUTH2_ADS_FLAGS, 
				    credentials, SEC_CHAN_BDC, 
				    &creds)) {
		return false;
	}

	status = torture_temp_dir(tctx, "PACVerify", &tmp_dir);
	torture_assert_ntstatus_ok(tctx, status, "torture_temp_dir failed");

	msg_server_ctx = messaging_init(tctx, 
					tmp_dir,
					cluster_id(0, 1), 
				        lp_iconv_convenience(tctx->lp_ctx),
					tctx->ev);
	
	torture_assert(tctx, msg_server_ctx != NULL, "Failed to init messaging context");

	status = gensec_client_start(tctx, &gensec_client_context, tctx->ev, tctx->lp_ctx);
	torture_assert_ntstatus_ok(tctx, status, "gensec_client_start (client) failed");

	status = gensec_set_target_hostname(gensec_client_context, TEST_MACHINE_NAME);

	status = gensec_set_credentials(gensec_client_context, cmdline_credentials);
	torture_assert_ntstatus_ok(tctx, status, "gensec_set_credentials (client) failed");

	status = gensec_start_mech_by_sasl_name(gensec_client_context, "GSSAPI");
	torture_assert_ntstatus_ok(tctx, status, "gensec_start_mech_by_sasl_name (client) failed");

	status = gensec_server_start(tctx, tctx->ev, tctx->lp_ctx, msg_server_ctx, &gensec_server_context);
	torture_assert_ntstatus_ok(tctx, status, "gensec_server_start (server) failed");

	status = gensec_set_credentials(gensec_server_context, credentials);
	torture_assert_ntstatus_ok(tctx, status, "gensec_set_credentials (server) failed");

	status = gensec_start_mech_by_sasl_name(gensec_server_context, "GSSAPI");
	torture_assert_ntstatus_ok(tctx, status, "gensec_start_mech_by_sasl_name (server) failed");

	server_to_client = data_blob(NULL, 0);
	
	do {
		/* Do a client-server update dance */
		status = gensec_update(gensec_client_context, tmp_ctx, server_to_client, &client_to_server);
		if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {;
			torture_assert_ntstatus_ok(tctx, status, "gensec_update (client) failed");
		}

		if (client_to_server.length == 0) {
			break;
		}

		status = gensec_update(gensec_server_context, tmp_ctx, client_to_server, &server_to_client);
		if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {;
			torture_assert_ntstatus_ok(tctx, status, "gensec_update (server) failed");
		}

		if (server_to_client.length == 0) {
			break;
		}
	} while (1);

	/* Extract the PAC using Samba's code */

	status = gensec_session_info(gensec_server_context, &session_info);
	torture_assert_ntstatus_ok(tctx, status, "gensec_gssapi_session_info failed");
	
	/* Extract a raw PAC */

	gensec_gssapi_state = talloc_get_type(gensec_server_context->private_data, struct gensec_gssapi_state);

	maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat, 
							       gensec_gssapi_state->gssapi_context, 
							       KRB5_AUTHDATA_WIN2K_PAC,
							       &pac);
	
	if (maj_stat == 0) {
		pac_blob = data_blob_talloc(tmp_ctx, pac.value, pac.length);
		gss_release_buffer(&min_stat, &pac);

	} else {
		pac_blob = data_blob(NULL, 0);
	}

	pac_wrapped_struct.MessageType = 0x3;
	pac_wrapped_struct.ChecksumLength = pac_blob.length;
	pac_wrapped_struct.SignatureType = 0;
	pac_wrapped_struct.SignatureLength = 0;
	pac_wrapped_struct.data = pac_blob.data;

	ndr_err = ndr_push_struct_blob(&pac_wrapped, tmp_ctx, lp_iconv_convenience(tctx->lp_ctx), &pac_wrapped_struct,
				       (ndr_push_flags_fn_t)ndr_push_PAC_Validate);
	torture_assert(tctx, NDR_ERR_CODE_IS_SUCCESS(ndr_err), "ndr_push_struct_blob of PACValidate structure failed");
		
	
	/* Validate it over the netlogon pipe */

	generic.identity_info.parameter_control = 0;
	generic.identity_info.logon_id_high = 0;
	generic.identity_info.logon_id_low = 0;
	generic.identity_info.domain_name.string = session_info->server_info->domain_name;
	generic.identity_info.account_name.string = session_info->server_info->account_name;
	generic.identity_info.workstation.string = TEST_MACHINE_NAME;

	generic.package_name.string = "Kerberos";
	generic.length = pac_wrapped.length;
	generic.data = pac_wrapped.data;

	ZERO_STRUCT(auth2);
	creds_client_authenticator(creds, &auth);
	r.in.credential = &auth;
	r.in.return_authenticator = &auth2;
	r.in.logon_level = NetlogonGenericInformation;
	r.in.logon.generic = &generic;
	r.in.server_name = talloc_asprintf(tctx, "\\\\%s", dcerpc_server_name(p));
	r.in.computer_name = cli_credentials_get_workstation(credentials);
	r.in.validation_level = NetlogonValidationGenericInfo2;

	status = dcerpc_netr_LogonSamLogon(p, tctx, &r);

	torture_assert_ntstatus_ok(tctx, status, "LogonSamLogon failed");
	
	torture_assert(tctx, creds_client_check(creds, &r.out.return_authenticator->cred), 
		       "Credential chaining failed");

	return true;
}

struct torture_suite *torture_rpc_remote_pac(TALLOC_CTX *mem_ctx)
{
	struct torture_suite *suite = torture_suite_create(mem_ctx, "PAC");
	struct torture_rpc_tcase *tcase;
	struct torture_test *test;

	tcase = torture_suite_add_machine_rpc_iface_tcase(suite, "netlogon", 
						  &ndr_table_netlogon, TEST_MACHINE_NAME);
	torture_rpc_tcase_add_test_creds(tcase, "verify", test_PACVerify);

	return suite;
}