/*
   Unix SMB/CIFS implementation.
   RPC pipe client
   Copyright (C) Tim Potter                        2000-2001,
   Copyright (C) Andrew Tridgell              1992-1997,2000,
   Copyright (C) Rafal Szczesniak                       2002
   Copyright (C) Jeremy Allison				2005.
   Copyright (C) Michael Adam				2007.
   Copyright (C) Guenther Deschner			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"

/** @defgroup lsa LSA - Local Security Architecture
 *  @ingroup rpc_client
 *
 * @{
 **/

/**
 * @file cli_lsarpc.c
 *
 * RPC client routines for the LSA RPC pipe.  LSA means "local
 * security authority", which is half of a password database.
 **/

/** Open a LSA policy handle
 *
 * @param cli Handle on an initialised SMB connection */

NTSTATUS rpccli_lsa_open_policy(struct rpc_pipe_client *cli,
				TALLOC_CTX *mem_ctx,
				bool sec_qos, uint32 des_access,
				struct policy_handle *pol)
{
	struct lsa_ObjectAttribute attr;
	struct lsa_QosInfo qos;
	uint16_t system_name = '\\';

	ZERO_STRUCT(attr);

	attr.len	= 0x18;

	if (sec_qos) {
		qos.len			= 0xc;
		qos.impersonation_level	= 2;
		qos.context_mode	= 1;
		qos.effective_only	= 0;

		attr.sec_qos		= &qos;
	}

	return rpccli_lsa_OpenPolicy(cli, mem_ctx,
				     &system_name,
				     &attr,
				     des_access,
				     pol);
}

/** Open a LSA policy handle
  *
  * @param cli Handle on an initialised SMB connection
  */

NTSTATUS rpccli_lsa_open_policy2(struct rpc_pipe_client *cli,
				 TALLOC_CTX *mem_ctx, bool sec_qos,
				 uint32 des_access, struct policy_handle *pol)
{
	struct lsa_ObjectAttribute attr;
	struct lsa_QosInfo qos;

	ZERO_STRUCT(attr);

	attr.len	= 0x18;

	if (sec_qos) {
		qos.len			= 0xc;
		qos.impersonation_level	= 2;
		qos.context_mode	= 1;
		qos.effective_only	= 0;

		attr.sec_qos		= &qos;
	}

	return rpccli_lsa_OpenPolicy2(cli, mem_ctx,
				      cli->srv_name_slash,
				      &attr,
				      des_access,
				      pol);
}

/* Lookup a list of sids
 *
 * internal version withOUT memory allocation of the target arrays.
 * this assumes suffciently sized arrays to store domains, names and types. */

static NTSTATUS rpccli_lsa_lookup_sids_noalloc(struct rpc_pipe_client *cli,
					       TALLOC_CTX *mem_ctx,
					       struct policy_handle *pol,
					       int num_sids,
					       const DOM_SID *sids,
					       char **domains,
					       char **names,
					       enum lsa_SidType *types)
{
	NTSTATUS result = NT_STATUS_OK;
	TALLOC_CTX *tmp_ctx = NULL;
	int i;
	struct lsa_SidArray sid_array;
	struct lsa_RefDomainList *ref_domains = NULL;
	struct lsa_TransNameArray lsa_names;
	uint32_t count = 0;
	uint16_t level = 1;

	ZERO_STRUCT(lsa_names);

	tmp_ctx = talloc_new(mem_ctx);
	if (!tmp_ctx) {
		DEBUG(0, ("rpccli_lsa_lookup_sids_noalloc: out of memory!\n"));
		result = NT_STATUS_UNSUCCESSFUL;
		goto done;
	}

	sid_array.num_sids = num_sids;
	sid_array.sids = TALLOC_ARRAY(mem_ctx, struct lsa_SidPtr, num_sids);
	if (!sid_array.sids) {
		return NT_STATUS_NO_MEMORY;
	}

	for (i = 0; i<num_sids; i++) {
		sid_array.sids[i].sid = sid_dup_talloc(mem_ctx, &sids[i]);
		if (!sid_array.sids[i].sid) {
			return NT_STATUS_NO_MEMORY;
		}
	}

	result = rpccli_lsa_LookupSids(cli, mem_ctx,
				       pol,
				       &sid_array,
				       &ref_domains,
				       &lsa_names,
				       level,
				       &count);

	DEBUG(10, ("LSA_LOOKUPSIDS returned '%s', mapped count = %d'\n",
		   nt_errstr(result), count));

	if (!NT_STATUS_IS_OK(result) &&
	    !NT_STATUS_EQUAL(result, NT_STATUS_NONE_MAPPED) &&
	    !NT_STATUS_EQUAL(result, STATUS_SOME_UNMAPPED))
	{
		/* An actual error occured */
		goto done;
	}

	/* Return output parameters */

	if (NT_STATUS_EQUAL(result, NT_STATUS_NONE_MAPPED) ||
	    (count == 0))
	{
		for (i = 0; i < num_sids; i++) {
			(names)[i] = NULL;
			(domains)[i] = NULL;
			(types)[i] = SID_NAME_UNKNOWN;
		}
		result = NT_STATUS_NONE_MAPPED;
		goto done;
	}

	for (i = 0; i < num_sids; i++) {
		const char *name, *dom_name;
		uint32_t dom_idx = lsa_names.names[i].sid_index;

		/* Translate optimised name through domain index array */

		if (dom_idx != 0xffffffff) {

			dom_name = ref_domains->domains[dom_idx].name.string;
			name = lsa_names.names[i].name.string;

			if (name) {
				(names)[i] = talloc_strdup(mem_ctx, name);
				if ((names)[i] == NULL) {
					DEBUG(0, ("cli_lsa_lookup_sids_noalloc(): out of memory\n"));
					result = NT_STATUS_UNSUCCESSFUL;
					goto done;
				}
			} else {
				(names)[i] = NULL;
			}
			(domains)[i] = talloc_strdup(mem_ctx, dom_name);
			(types)[i] = lsa_names.names[i].sid_type;
			if (((domains)[i] == NULL)) {
				DEBUG(0, ("cli_lsa_lookup_sids_noalloc(): out of memory\n"));
				result = NT_STATUS_UNSUCCESSFUL;
				goto done;
			}

		} else {
			(names)[i] = NULL;
			(domains)[i] = NULL;
			(types)[i] = SID_NAME_UNKNOWN;
		}
	}

done:
	TALLOC_FREE(tmp_ctx);
	return result;
}

/* Lookup a list of sids
 *
 * do it the right way: there is a limit (of 20480 for w2k3) entries
 * returned by this call. when the sids list contains more entries,
 * empty lists are returned. This version of lsa_lookup_sids passes
 * the list of sids in hunks of LOOKUP_SIDS_HUNK_SIZE to the lsa call. */

/* This constant defines the limit of how many sids to look up
 * in one call (maximum). the limit from the server side is
 * at 20480 for win2k3, but we keep it at a save 1000 for now. */
#define LOOKUP_SIDS_HUNK_SIZE 1000

NTSTATUS rpccli_lsa_lookup_sids(struct rpc_pipe_client *cli,
				TALLOC_CTX *mem_ctx,
				struct policy_handle *pol,
				int num_sids,
				const DOM_SID *sids,
				char ***pdomains,
				char ***pnames,
				enum lsa_SidType **ptypes)
{
	NTSTATUS result = NT_STATUS_OK;
	int sids_left = 0;
	int sids_processed = 0;
	const DOM_SID *hunk_sids = sids;
	char **hunk_domains;
	char **hunk_names;
	enum lsa_SidType *hunk_types;
	char **domains = NULL;
	char **names = NULL;
	enum lsa_SidType *types = NULL;

	if (num_sids) {
		if (!(domains = TALLOC_ARRAY(mem_ctx, char *, num_sids))) {
			DEBUG(0, ("rpccli_lsa_lookup_sids(): out of memory\n"));
			result = NT_STATUS_NO_MEMORY;
			goto fail;
		}

		if (!(names = TALLOC_ARRAY(mem_ctx, char *, num_sids))) {
			DEBUG(0, ("rpccli_lsa_lookup_sids(): out of memory\n"));
			result = NT_STATUS_NO_MEMORY;
			goto fail;
		}

		if (!(types = TALLOC_ARRAY(mem_ctx, enum lsa_SidType, num_sids))) {
			DEBUG(0, ("rpccli_lsa_lookup_sids(): out of memory\n"));
			result = NT_STATUS_NO_MEMORY;
			goto fail;
		}
	}

	sids_left = num_sids;
	hunk_domains = domains;
	hunk_names = names;
	hunk_types = types;

	while (sids_left > 0) {
		int hunk_num_sids;
		NTSTATUS hunk_result = NT_STATUS_OK;

		hunk_num_sids = ((sids_left > LOOKUP_SIDS_HUNK_SIZE)
				? LOOKUP_SIDS_HUNK_SIZE
				: sids_left);

		DEBUG(10, ("rpccli_lsa_lookup_sids: processing items "
			   "%d -- %d of %d.\n",
			   sids_processed,
			   sids_processed + hunk_num_sids - 1,
			   num_sids));

		hunk_result = rpccli_lsa_lookup_sids_noalloc(cli,
							     mem_ctx,
							     pol,
							     hunk_num_sids,
							     hunk_sids,
							     hunk_domains,
							     hunk_names,
							     hunk_types);

		if (!NT_STATUS_IS_OK(hunk_result) &&
		    !NT_STATUS_EQUAL(hunk_result, STATUS_SOME_UNMAPPED) &&
		    !NT_STATUS_EQUAL(hunk_result, NT_STATUS_NONE_MAPPED))
		{
			/* An actual error occured */
			result = hunk_result;
			goto fail;
		}

		/* adapt overall result */
		if (( NT_STATUS_IS_OK(result) &&
		     !NT_STATUS_IS_OK(hunk_result))
		    ||
		    ( NT_STATUS_EQUAL(result, NT_STATUS_NONE_MAPPED) &&
		     !NT_STATUS_EQUAL(hunk_result, NT_STATUS_NONE_MAPPED)))
		{
			result = STATUS_SOME_UNMAPPED;
		}

		sids_left -= hunk_num_sids;
		sids_processed += hunk_num_sids; /* only used in DEBUG */
		hunk_sids += hunk_num_sids;
		hunk_domains += hunk_num_sids;
		hunk_names += hunk_num_sids;
		hunk_types += hunk_num_sids;
	}

	*pdomains = domains;
	*pnames = names;
	*ptypes = types;
	return result;

fail:
	TALLOC_FREE(domains);
	TALLOC_FREE(names);
	TALLOC_FREE(types);
	return result;
}

/** Lookup a list of names */

NTSTATUS rpccli_lsa_lookup_names(struct rpc_pipe_client *cli,
				 TALLOC_CTX *mem_ctx,
				 struct policy_handle *pol, int num_names,
				 const char **names,
				 const char ***dom_names,
				 int level,
				 DOM_SID **sids,
				 enum lsa_SidType **types)
{
	NTSTATUS result;
	int i;
	struct lsa_String *lsa_names = NULL;
	struct lsa_RefDomainList *domains = NULL;
	struct lsa_TransSidArray sid_array;
	uint32_t count = 0;

	ZERO_STRUCT(sid_array);

	lsa_names = TALLOC_ARRAY(mem_ctx, struct lsa_String, num_names);
	if (!lsa_names) {
		return NT_STATUS_NO_MEMORY;
	}

	for (i=0; i<num_names; i++) {
		init_lsa_String(&lsa_names[i], names[i]);
	}

	result = rpccli_lsa_LookupNames(cli, mem_ctx,
				        pol,
					num_names,
					lsa_names,
					&domains,
					&sid_array,
					level,
					&count);

	if (!NT_STATUS_IS_OK(result) && NT_STATUS_V(result) !=
	    NT_STATUS_V(STATUS_SOME_UNMAPPED)) {

		/* An actual error occured */

		goto done;
	}

	/* Return output parameters */

	if (count == 0) {
		result = NT_STATUS_NONE_MAPPED;
		goto done;
	}

	if (num_names) {
		if (!((*sids = TALLOC_ARRAY(mem_ctx, DOM_SID, num_names)))) {
			DEBUG(0, ("cli_lsa_lookup_sids(): out of memory\n"));
			result = NT_STATUS_NO_MEMORY;
			goto done;
		}

		if (!((*types = TALLOC_ARRAY(mem_ctx, enum lsa_SidType, num_names)))) {
			DEBUG(0, ("cli_lsa_lookup_sids(): out of memory\n"));
			result = NT_STATUS_NO_MEMORY;
			goto done;
		}

		if (dom_names != NULL) {
			*dom_names = TALLOC_ARRAY(mem_ctx, const char *, num_names);
			if (*dom_names == NULL) {
				DEBUG(0, ("cli_lsa_lookup_sids(): out of memory\n"));
				result = NT_STATUS_NO_MEMORY;
				goto done;
			}
		}
	} else {
		*sids = NULL;
		*types = NULL;
		if (dom_names != NULL) {
			*dom_names = NULL;
		}
	}

	for (i = 0; i < num_names; i++) {
		uint32_t dom_idx = sid_array.sids[i].sid_index;
		uint32_t dom_rid = sid_array.sids[i].rid;
		DOM_SID *sid = &(*sids)[i];

		/* Translate optimised sid through domain index array */

		if (dom_idx == 0xffffffff) {
			/* Nothing to do, this is unknown */
			ZERO_STRUCTP(sid);
			(*types)[i] = SID_NAME_UNKNOWN;
			continue;
		}

		sid_copy(sid, domains->domains[dom_idx].sid);

		if (dom_rid != 0xffffffff) {
			sid_append_rid(sid, dom_rid);
		}

		(*types)[i] = sid_array.sids[i].sid_type;

		if (dom_names == NULL) {
			continue;
		}

		(*dom_names)[i] = domains->domains[dom_idx].name.string;
	}

 done:

	return result;
}