/*
 * Unix SMB/CIFS implementation.
 *
 * Winbind rpc backend functions
 *
 * Copyright (c) 2000-2003 Tim Potter
 * Copyright (c) 2001      Andrew Tridgell
 * Copyright (c) 2005      Volker Lendecke
 * Copyright (c) 2008      Guenther Deschner (pidl conversion)
 * Copyright (c) 2010      Andreas Schneider <asn@samba.org>
 *
 * 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 "winbindd.h"
#include "../librpc/gen_ndr/cli_samr.h"
#include "rpc_client/cli_samr.h"
#include "../librpc/gen_ndr/srv_samr.h"
#include "../librpc/gen_ndr/cli_lsa.h"
#include "rpc_client/cli_lsarpc.h"
#include "../librpc/gen_ndr/srv_lsa.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND

static NTSTATUS open_internal_samr_pipe(TALLOC_CTX *mem_ctx,
					struct rpc_pipe_client **samr_pipe)
{
	static struct rpc_pipe_client *cli = NULL;
	struct auth_serversupplied_info *server_info = NULL;
	NTSTATUS status;

	if (cli != NULL) {
		goto done;
	}

	if (server_info == NULL) {
		status = make_server_info_system(mem_ctx, &server_info);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0, ("open_samr_pipe: Could not create auth_serversupplied_info: %s\n",
				  nt_errstr(status)));
			return status;
		}
	}

	/* create a samr connection */
	status = rpc_pipe_open_internal(talloc_autofree_context(),
					&ndr_table_samr.syntax_id,
					rpc_samr_dispatch,
					server_info,
					&cli);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("open_samr_pipe: Could not connect to samr_pipe: %s\n",
			  nt_errstr(status)));
		return status;
	}

done:
	if (samr_pipe) {
		*samr_pipe = cli;
	}

	return NT_STATUS_OK;
}

static NTSTATUS open_internal_samr_conn(TALLOC_CTX *mem_ctx,
				        struct winbindd_domain *domain,
				        struct rpc_pipe_client **samr_pipe,
				        struct policy_handle *samr_domain_hnd)
{
	NTSTATUS status;
	struct policy_handle samr_connect_hnd;

	status = open_internal_samr_pipe(mem_ctx, samr_pipe);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	status = rpccli_samr_Connect2((*samr_pipe),
				      mem_ctx,
				      (*samr_pipe)->desthost,
				      SEC_FLAG_MAXIMUM_ALLOWED,
				      &samr_connect_hnd);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	status = rpccli_samr_OpenDomain((*samr_pipe),
					mem_ctx,
					&samr_connect_hnd,
					SEC_FLAG_MAXIMUM_ALLOWED,
					&domain->sid,
					samr_domain_hnd);

	return status;
}

static NTSTATUS open_internal_lsa_pipe(TALLOC_CTX *mem_ctx,
				       struct rpc_pipe_client **lsa_pipe)
{
	static struct rpc_pipe_client *cli = NULL;
	struct auth_serversupplied_info *server_info = NULL;
	NTSTATUS status;

	if (cli != NULL) {
		goto done;
	}

	if (server_info == NULL) {
		status = make_server_info_system(mem_ctx, &server_info);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0, ("open_samr_pipe: Could not create auth_serversupplied_info: %s\n",
				  nt_errstr(status)));
			return status;
		}
	}

	/* create a samr connection */
	status = rpc_pipe_open_internal(talloc_autofree_context(),
					&ndr_table_lsarpc.syntax_id,
					rpc_lsarpc_dispatch,
					server_info,
					&cli);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("open_samr_pipe: Could not connect to samr_pipe: %s\n",
			  nt_errstr(status)));
		return status;
	}

done:
	if (lsa_pipe) {
		*lsa_pipe = cli;
	}

	return NT_STATUS_OK;
}

static NTSTATUS open_internal_lsa_conn(TALLOC_CTX *mem_ctx,
				       struct rpc_pipe_client **lsa_pipe,
				       struct policy_handle *lsa_hnd)
{
	NTSTATUS status;

	status = open_internal_lsa_pipe(mem_ctx, lsa_pipe);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	status = rpccli_lsa_open_policy((*lsa_pipe),
					mem_ctx,
					true,
					SEC_FLAG_MAXIMUM_ALLOWED,
					lsa_hnd);

	return status;
}

/*********************************************************************
 SAM specific functions.
*********************************************************************/

/* List all domain groups */
static NTSTATUS sam_enum_dom_groups(struct winbindd_domain *domain,
				    TALLOC_CTX *mem_ctx,
				    uint32_t *num_entries,
				    struct acct_info **info)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

/* Query display info for a domain */
static NTSTATUS sam_query_user_list(struct winbindd_domain *domain,
				    TALLOC_CTX *mem_ctx,
				    uint32_t *num_entries,
				    struct wbint_userinfo **info)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

/* Lookup user information from a rid or username. */
static NTSTATUS sam_query_user(struct winbindd_domain *domain,
			       TALLOC_CTX *mem_ctx,
			       const struct dom_sid *user_sid,
			       struct wbint_userinfo *user_info)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

/* get a list of trusted domains - builtin domain */
static NTSTATUS sam_trusted_domains(struct winbindd_domain *domain,
				    TALLOC_CTX *mem_ctx,
				    struct netr_DomainTrustList *trusts)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

/* Lookup group membership given a rid.   */
static NTSTATUS sam_lookup_groupmem(struct winbindd_domain *domain,
				    TALLOC_CTX *mem_ctx,
				    const struct dom_sid *group_sid,
				    enum lsa_SidType type,
				    uint32_t *num_names,
				    struct dom_sid **sid_mem,
				    char ***names,
				    uint32_t **name_types)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

/*********************************************************************
 BUILTIN specific functions.
*********************************************************************/

/* List all domain groups */
static NTSTATUS builtin_enum_dom_groups(struct winbindd_domain *domain,
				TALLOC_CTX *mem_ctx,
				uint32 *num_entries,
				struct acct_info **info)
{
	/* BUILTIN doesn't have domain groups */
	*num_entries = 0;
	*info = NULL;
	return NT_STATUS_OK;
}

/* Query display info for a domain */
static NTSTATUS builtin_query_user_list(struct winbindd_domain *domain,
				TALLOC_CTX *mem_ctx,
				uint32 *num_entries,
				struct wbint_userinfo **info)
{
	/* We don't have users */
	*num_entries = 0;
	*info = NULL;
	return NT_STATUS_OK;
}

/* Lookup user information from a rid or username. */
static NTSTATUS builtin_query_user(struct winbindd_domain *domain,
				TALLOC_CTX *mem_ctx,
				const struct dom_sid *user_sid,
				struct wbint_userinfo *user_info)
{
	return NT_STATUS_NO_SUCH_USER;
}

/* get a list of trusted domains - builtin domain */
static NTSTATUS builtin_trusted_domains(struct winbindd_domain *domain,
					TALLOC_CTX *mem_ctx,
					struct netr_DomainTrustList *trusts)
{
	ZERO_STRUCTP(trusts);
	return NT_STATUS_OK;
}

/*********************************************************************
 COMMON functions.
*********************************************************************/

/* List all local groups (aliases) */
static NTSTATUS common_enum_local_groups(struct winbindd_domain *domain,
					 TALLOC_CTX *mem_ctx,
					 uint32_t *num_entries,
					 struct acct_info **info)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

/* convert a single name to a sid in a domain */
static NTSTATUS common_name_to_sid(struct winbindd_domain *domain,
				   TALLOC_CTX *mem_ctx,
				   const char *domain_name,
				   const char *name,
				   uint32_t flags,
				   struct dom_sid *sid,
				   enum lsa_SidType *type)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

/* convert a domain SID to a user or group name */
static NTSTATUS common_sid_to_name(struct winbindd_domain *domain,
				   TALLOC_CTX *mem_ctx,
				   const struct dom_sid *sid,
				   char **domain_name,
				   char **name,
				   enum lsa_SidType *type)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS common_rids_to_names(struct winbindd_domain *domain,
				     TALLOC_CTX *mem_ctx,
				     const struct dom_sid *sid,
				     uint32 *rids,
				     size_t num_rids,
				     char **domain_name,
				     char ***names,
				     enum lsa_SidType **types)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS common_lockout_policy(struct winbindd_domain *domain,
				      TALLOC_CTX *mem_ctx,
				      struct samr_DomInfo12 *policy)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS common_password_policy(struct winbindd_domain *domain,
				       TALLOC_CTX *mem_ctx,
				       struct samr_DomInfo1 *policy)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

/* Lookup groups a user is a member of.  I wish Unix had a call like this! */
static NTSTATUS common_lookup_usergroups(struct winbindd_domain *domain,
					 TALLOC_CTX *mem_ctx,
					 const struct dom_sid *user_sid,
					 uint32_t *num_groups,
					 struct dom_sid **user_gids)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS common_lookup_useraliases(struct winbindd_domain *domain,
					  TALLOC_CTX *mem_ctx,
					  uint32_t num_sids,
					  const struct dom_sid *sids,
					  uint32_t *p_num_aliases,
					  uint32_t **rids)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

/* find the sequence number for a domain */
static NTSTATUS common_sequence_number(struct winbindd_domain *domain,
				       uint32_t *seq)
{
	/* TODO FIXME */
	return NT_STATUS_NOT_IMPLEMENTED;
}

#if 0
/* the rpc backend methods are exposed via this structure */
struct winbindd_methods builtin_passdb_methods = {
	.consistent            = false,

	.query_user_list       = builtin_query_user_list,
	.enum_dom_groups       = builtin_enum_dom_groups,
	.enum_local_groups     = common_enum_local_groups,
	.name_to_sid           = common_name_to_sid,
	.sid_to_name           = common_sid_to_name,
	.rids_to_names         = common_rids_to_names,
	.query_user            = builtin_query_user,
	.lookup_usergroups     = common_lookup_usergroups,
	.lookup_useraliases    = common_lookup_useraliases,
	.lookup_groupmem       = sam_lookup_groupmem,
	.sequence_number       = common_sequence_number,
	.lockout_policy        = common_lockout_policy,
	.password_policy       = common_password_policy,
	.trusted_domains       = builtin_trusted_domains
};

/* the rpc backend methods are exposed via this structure */
struct winbindd_methods sam_passdb_methods = {
	.consistent            = false,

	.query_user_list       = sam_query_user_list,
	.enum_dom_groups       = sam_enum_dom_groups,
	.enum_local_groups     = common_enum_local_groups,
	.name_to_sid           = common_name_to_sid,
	.sid_to_name           = common_sid_to_name,
	.rids_to_names         = common_rids_to_names,
	.query_user            = sam_query_user,
	.lookup_usergroups     = common_lookup_usergroups,
	.lookup_useraliases    = common_lookup_useraliases,
	.lookup_groupmem       = sam_lookup_groupmem,
	.sequence_number       = common_sequence_number,
	.lockout_policy        = common_lockout_policy,
	.password_policy       = common_password_policy,
	.trusted_domains       = sam_trusted_domains
};
#endif