rpc_winreg.c

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/*
   Unix SMB/CIFS implementation.

   endpoint server for the winreg pipe

   Copyright (C) Jelmer Vernooij 2004

   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 "rpc_server/dcerpc_server.h"
#include "lib/registry/registry.h"
#include "librpc/gen_ndr/ndr_winreg.h"
#include "rpc_server/common/common.h"
#include "librpc/gen_ndr/ndr_security.h"
#include "param/param.h"
#include "libcli/security/security.h"

enum handle_types { HTYPE_REGVAL, HTYPE_REGKEY };

static NTSTATUS dcerpc_winreg_bind(struct dcesrv_call_state *dce_call,
				   const struct dcesrv_interface *iface)
{
	struct registry_context *ctx;
	WERROR err;

	err = reg_open_samba(dce_call->context,
			     &ctx, dce_call->event_ctx, dce_call->conn->dce_ctx->lp_ctx, dce_call->conn->auth_state.session_info,
			     NULL);

	if (!W_ERROR_IS_OK(err)) {
		DEBUG(0, ("Error opening registry: %s\n", win_errstr(err)));
		return NT_STATUS_UNSUCCESSFUL;
	}

	dce_call->context->private = ctx;

	return NT_STATUS_OK;
}

#define DCESRV_INTERFACE_WINREG_BIND dcerpc_winreg_bind

static WERROR dcesrv_winreg_openhive(struct dcesrv_call_state *dce_call,
				     TALLOC_CTX *mem_ctx, uint32_t hkey,
				     struct policy_handle **outh)
{
	struct registry_context *ctx = dce_call->context->private;
	struct dcesrv_handle *h;
	WERROR error;

	h = dcesrv_handle_new(dce_call->context, HTYPE_REGKEY);

	error = reg_get_predefined_key(ctx, hkey,
				       (struct registry_key **)&h->data);
	if (!W_ERROR_IS_OK(error)) {
		return error;
	}

	*outh = &h->wire_handle;

	return error;
}

#define func_winreg_OpenHive(k,n) static WERROR dcesrv_winreg_Open ## k (struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct winreg_Open ## k *r) \
{ \
	return dcesrv_winreg_openhive (dce_call, mem_ctx, n, &r->out.handle);\
}

func_winreg_OpenHive(HKCR,HKEY_CLASSES_ROOT)
func_winreg_OpenHive(HKCU,HKEY_CURRENT_USER)
func_winreg_OpenHive(HKLM,HKEY_LOCAL_MACHINE)
func_winreg_OpenHive(HKPD,HKEY_PERFORMANCE_DATA)
func_winreg_OpenHive(HKU,HKEY_USERS)
func_winreg_OpenHive(HKCC,HKEY_CURRENT_CONFIG)
func_winreg_OpenHive(HKDD,HKEY_DYN_DATA)
func_winreg_OpenHive(HKPT,HKEY_PERFORMANCE_TEXT)
func_winreg_OpenHive(HKPN,HKEY_PERFORMANCE_NLSTEXT)

/*
  winreg_CloseKey
*/
static WERROR dcesrv_winreg_CloseKey(struct dcesrv_call_state *dce_call,
				     TALLOC_CTX *mem_ctx,
				     struct winreg_CloseKey *r)
{
	struct dcesrv_handle *h;

	DCESRV_PULL_HANDLE_FAULT(h, r->in.handle, HTYPE_REGKEY);

	talloc_free(h);

	ZERO_STRUCTP(r->out.handle);

	return WERR_OK;
}

/*
  winreg_CreateKey
*/
static WERROR dcesrv_winreg_CreateKey(struct dcesrv_call_state *dce_call,
				      TALLOC_CTX *mem_ctx,
				      struct winreg_CreateKey *r)
{
	struct dcesrv_handle *h, *newh;
	WERROR error;
	struct security_descriptor sd;

	DCESRV_PULL_HANDLE_FAULT(h, r->in.handle, HTYPE_REGKEY);

	newh = dcesrv_handle_new(dce_call->context, HTYPE_REGKEY);

	switch (security_session_user_level(dce_call->conn->auth_state.session_info))
	{
	case SECURITY_SYSTEM:
	case SECURITY_ADMINISTRATOR:
		/* the security descriptor is optional */
		if (r->in.secdesc != NULL) {
			DATA_BLOB sdblob;
			enum ndr_err_code ndr_err;
			sdblob.data = r->in.secdesc->sd.data;
			sdblob.length = r->in.secdesc->sd.len;
			if (sdblob.data == NULL) {
				return WERR_INVALID_PARAM;
			}
			ndr_err = ndr_pull_struct_blob_all(&sdblob, mem_ctx, NULL, &sd,
							   (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
			if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
				return WERR_INVALID_PARAM;
			}
		}
		
		error = reg_key_add_name(newh, (struct registry_key *)h->data,
					 r->in.name.name, NULL, r->in.secdesc?&sd:NULL,
					 (struct registry_key **)&newh->data);
		if (W_ERROR_IS_OK(error)) {
			r->out.new_handle = &newh->wire_handle;
		} else {
			talloc_free(newh);
		}
		
		return error;
	default:
		return WERR_ACCESS_DENIED;
	}
}


/*
  winreg_DeleteKey
*/
static WERROR dcesrv_winreg_DeleteKey(struct dcesrv_call_state *dce_call,
				      TALLOC_CTX *mem_ctx,
				      struct winreg_DeleteKey *r)
{
	struct dcesrv_handle *h;

	DCESRV_PULL_HANDLE_FAULT(h, r->in.handle, HTYPE_REGKEY);

	switch (security_session_user_level(dce_call->conn->auth_state.session_info))
	{
	case SECURITY_SYSTEM:
	case SECURITY_ADMINISTRATOR:
		return reg_key_del((struct registry_key *)h->data, r->in.key.name);
	default:
		return WERR_ACCESS_DENIED;
	}
}


/*
  winreg_DeleteValue
*/
static WERROR dcesrv_winreg_DeleteValue(struct dcesrv_call_state *dce_call,
					TALLOC_CTX *mem_ctx,
					struct winreg_DeleteValue *r)
{
	struct dcesrv_handle *h;
	struct registry_key *key;

	DCESRV_PULL_HANDLE_FAULT(h, r->in.handle, HTYPE_REGKEY);

	switch (security_session_user_level(dce_call->conn->auth_state.session_info))
	{
	case SECURITY_SYSTEM:
	case SECURITY_ADMINISTRATOR:
		key = h->data;
		
		return reg_del_value(key, r->in.value.name);
	default:
		return WERR_ACCESS_DENIED;
	}
}


/*
  winreg_EnumKey
*/
static WERROR dcesrv_winreg_EnumKey(struct dcesrv_call_state *dce_call,
				    TALLOC_CTX *mem_ctx,
				    struct winreg_EnumKey *r)
{
	struct dcesrv_handle *h;
	const char *name;
	NTTIME last_mod;

	DCESRV_PULL_HANDLE_FAULT(h, r->in.handle, HTYPE_REGKEY);

	r->out.result = reg_key_get_subkey_by_index(mem_ctx,
						    (struct registry_key *)h->data,
						    r->in.enum_index,
						    &name, NULL, &last_mod);

	if (W_ERROR_IS_OK(r->out.result)) {
		if (2*strlen_m_term(name) > r->in.name->size) {
			return WERR_MORE_DATA;
		}
		r->out.name->length = 2*strlen_m_term(name);
		r->out.name->name = name;
		r->out.keyclass = talloc_zero(mem_ctx, struct winreg_StringBuf);
		if (r->in.last_changed_time) {
			r->out.last_changed_time = &last_mod;
		}
	}

	return r->out.result;
}


/*
  winreg_EnumValue
*/
static WERROR dcesrv_winreg_EnumValue(struct dcesrv_call_state *dce_call,
				      TALLOC_CTX *mem_ctx,
				      struct winreg_EnumValue *r)
{
	struct dcesrv_handle *h;
	struct registry_key *key;
	WERROR result;
	const char *data_name;
	uint32_t data_type;
	DATA_BLOB data;

	DCESRV_PULL_HANDLE_FAULT(h, r->in.handle, HTYPE_REGKEY);

	key = h->data;

	result = reg_key_get_value_by_index(mem_ctx, key, r->in.enum_index,
					    &data_name,
					    &data_type, &data);
	if (!W_ERROR_IS_OK(result)) {
		return result;
	}

	/* the client can optionally pass a NULL for type, meaning they don't
	   want that back */
	if (r->in.type != NULL) {
		r->out.type = talloc(mem_ctx, enum winreg_Type);
		*r->out.type = data_type;
	}

	/* check the client has enough room for the value */
	if (r->in.value != NULL &&
	    r->in.size != NULL &&
	    data.length > *r->in.size) {
		return WERR_MORE_DATA;
	}

	/* and enough room for the name */
	if (r->in.name->size < 2*strlen_m_term(data_name)) {
		return WERR_MORE_DATA;
	}

	r->out.name->name = data_name;
	r->out.name->length = 2*strlen_m_term(data_name);
	r->out.name->size = r->in.name->size;

	if (r->in.value) {
		r->out.value = data.data;
	}

	if (r->in.size) {
		r->out.size = talloc(mem_ctx, uint32_t);
		*r->out.size = data.length;
		r->out.length = r->out.size;
	}

	return WERR_OK;
}


/*
  winreg_FlushKey
*/
static WERROR dcesrv_winreg_FlushKey(struct dcesrv_call_state *dce_call,
				     TALLOC_CTX *mem_ctx,
				     struct winreg_FlushKey *r)
{
	struct dcesrv_handle *h;

	DCESRV_PULL_HANDLE_FAULT(h, r->in.handle, HTYPE_REGKEY);

	switch (security_session_user_level(dce_call->conn->auth_state.session_info))
	{
	case SECURITY_SYSTEM:
	case SECURITY_ADMINISTRATOR:
		return reg_key_flush(h->data);
	default:
		return WERR_ACCESS_DENIED;
	}
}


/*
  winreg_GetKeySecurity
*/
static WERROR dcesrv_winreg_GetKeySecurity(struct dcesrv_call_state *dce_call,
					   TALLOC_CTX *mem_ctx,
					   struct winreg_GetKeySecurity *r)
{
	struct dcesrv_handle *h;