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/*
Unix SMB/CIFS implementation.
Copyright (C) Ralph Boehme 2017
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 "smbd/smbd.h"
#include "smbd/globals.h"
#include "dbwrap/dbwrap.h"
#include "dbwrap/dbwrap_rbt.h"
#include "dbwrap/dbwrap_open.h"
#include "../lib/util/util_tdb.h"
#include "librpc/gen_ndr/ndr_ioctl.h"
#include "librpc/gen_ndr/ioctl.h"
#include "offload_token.h"
struct vfs_offload_ctx {
bool initialized;
struct db_context *db_ctx;
};
NTSTATUS vfs_offload_token_ctx_init(TALLOC_CTX *mem_ctx,
struct vfs_offload_ctx **_ctx)
{
struct vfs_offload_ctx *ctx = *_ctx;
if (ctx != NULL) {
if (!ctx->initialized) {
return NT_STATUS_INTERNAL_ERROR;
}
return NT_STATUS_OK;
}
ctx = talloc_zero(mem_ctx, struct vfs_offload_ctx);
if (ctx == NULL) {
return NT_STATUS_NO_MEMORY;
}
ctx->db_ctx = db_open_rbt(mem_ctx);
if (ctx->db_ctx == NULL) {
TALLOC_FREE(ctx);
return NT_STATUS_INTERNAL_ERROR;
}
ctx->initialized = true;
*_ctx = ctx;
return NT_STATUS_OK;
}
struct fsp_token_link {
struct vfs_offload_ctx *ctx;
DATA_BLOB token_blob;
};
static int fsp_token_link_destructor(struct fsp_token_link *link)
{
DATA_BLOB token_blob = link->token_blob;
TDB_DATA key = make_tdb_data(token_blob.data, token_blob.length);
NTSTATUS status;
status = dbwrap_delete(link->ctx->db_ctx, key);
if (!NT_STATUS_IS_OK(status)) {
DBG_ERR("dbwrap_delete failed: %s. Token:\n", nt_errstr(status));
dump_data(0, token_blob.data, token_blob.length);
return -1;
}
return 0;
}
NTSTATUS vfs_offload_token_db_store_fsp(struct vfs_offload_ctx *ctx,
const files_struct *fsp,
const DATA_BLOB *token_blob)
{
struct db_record *rec = NULL;
struct fsp_token_link *link = NULL;
TDB_DATA key = make_tdb_data(token_blob->data, token_blob->length);
TDB_DATA value;
NTSTATUS status;
rec = dbwrap_fetch_locked(ctx->db_ctx, talloc_tos(), key);
if (rec == NULL) {
return NT_STATUS_INTERNAL_ERROR;
}
value = dbwrap_record_get_value(rec);
if (value.dsize != 0) {
void *ptr = NULL;
files_struct *token_db_fsp = NULL;
if (value.dsize != sizeof(ptr)) {
DBG_ERR("Bad db entry for token:\n");
dump_data(1, token_blob->data, token_blob->length);
TALLOC_FREE(rec);
return NT_STATUS_INTERNAL_ERROR;
}
memcpy(&ptr, value.dptr, value.dsize);
TALLOC_FREE(rec);
token_db_fsp = talloc_get_type_abort(ptr, struct files_struct);
if (token_db_fsp != fsp) {
DBG_ERR("token for fsp [%s] matches already known "
"but different fsp [%s]:\n",
fsp_str_dbg(fsp), fsp_str_dbg(token_db_fsp));
dump_data(1, token_blob->data, token_blob->length);
return NT_STATUS_INTERNAL_ERROR;
}
return NT_STATUS_OK;
}
link = talloc_zero(fsp, struct fsp_token_link);
if (link == NULL) {
return NT_STATUS_NO_MEMORY;
}
link->ctx = ctx;
link->token_blob = data_blob_talloc(link, token_blob->data,
token_blob->length);
if (link->token_blob.data == NULL) {
TALLOC_FREE(link);
return NT_STATUS_NO_MEMORY;
}
talloc_set_destructor(link, fsp_token_link_destructor);
value = make_tdb_data((uint8_t *)&fsp, sizeof(files_struct *));
status = dbwrap_record_store(rec, value, 0);
if (!NT_STATUS_IS_OK(status)) {
DBG_ERR("dbwrap_record_store for [%s] failed: %s. Token\n",
fsp_str_dbg(fsp), nt_errstr(status));
dump_data(0, token_blob->data, token_blob->length);
TALLOC_FREE(link);
TALLOC_FREE(rec);
return status;
}
TALLOC_FREE(rec);
return NT_STATUS_OK;
}
NTSTATUS vfs_offload_token_db_fetch_fsp(struct vfs_offload_ctx *ctx,
const DATA_BLOB *token_blob,
files_struct **fsp)
{
struct db_record *rec = NULL;
TDB_DATA key = make_tdb_data(token_blob->data, token_blob->length);
TDB_DATA value;
void *ptr = NULL;
rec = dbwrap_fetch_locked(ctx->db_ctx, talloc_tos(), key);
if (rec == NULL) {
return NT_STATUS_INTERNAL_ERROR;
}
value = dbwrap_record_get_value(rec);
if (value.dsize == 0) {
DBG_DEBUG("Unknown token:\n");
dump_data(10, token_blob->data, token_blob->length);
TALLOC_FREE(rec);
return NT_STATUS_OBJECT_NAME_NOT_FOUND;
}
if (value.dsize != sizeof(ptr)) {
DBG_ERR("Bad db entry for token:\n");
dump_data(1, token_blob->data, token_blob->length);
TALLOC_FREE(rec);
return NT_STATUS_INTERNAL_ERROR;
}
memcpy(&ptr, value.dptr, value.dsize);
TALLOC_FREE(rec);
*fsp = talloc_get_type_abort(ptr, struct files_struct);
return NT_STATUS_OK;
}
NTSTATUS vfs_offload_token_create_blob(TALLOC_CTX *mem_ctx,
const files_struct *fsp,
uint32_t fsctl,
DATA_BLOB *token_blob)
{
size_t len;
switch (fsctl) {
case FSCTL_DUP_EXTENTS_TO_FILE:
len = 20;
break;
case FSCTL_SRV_REQUEST_RESUME_KEY:
len = 24;
break;
default:
DBG_ERR("Invalid fsctl [%" PRIu32 "]\n", fsctl);
return NT_STATUS_NOT_SUPPORTED;
}
*token_blob = data_blob_talloc_zero(mem_ctx, len);
if (token_blob->length == 0) {
return NT_STATUS_NO_MEMORY;
}
/* combine persistent and volatile handles for the resume key */
SBVAL(token_blob->data, 0, fsp->op->global->open_persistent_id);
SBVAL(token_blob->data, 8, fsp->op->global->open_volatile_id);
SIVAL(token_blob->data, 16, fsctl);
return NT_STATUS_OK;
}
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