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/*
Unix SMB / CIFS implementation .
Core SMB2 server
Copyright ( C ) Stefan Metzmacher 2009
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"
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# include "smbd/smbd.h"
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# include "smbd/globals.h"
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# include "../libcli/smb/smb_common.h"
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# include "../lib/util/tevent_ntstatus.h"
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# include "rpc_server/srv_pipe_hnd.h"
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static struct tevent_req * smbd_smb2_write_send ( TALLOC_CTX * mem_ctx ,
struct tevent_context * ev ,
struct smbd_smb2_request * smb2req ,
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struct files_struct * in_fsp ,
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DATA_BLOB in_data ,
uint64_t in_offset ,
uint32_t in_flags ) ;
static NTSTATUS smbd_smb2_write_recv ( struct tevent_req * req ,
uint32_t * out_count ) ;
static void smbd_smb2_request_write_done ( struct tevent_req * subreq ) ;
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NTSTATUS smbd_smb2_request_process_write ( struct smbd_smb2_request * req )
{
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struct smbXsrv_connection * xconn = req - > xconn ;
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NTSTATUS status ;
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const uint8_t * inbody ;
uint16_t in_data_offset ;
uint32_t in_data_length ;
DATA_BLOB in_data_buffer ;
uint64_t in_offset ;
uint64_t in_file_id_persistent ;
uint64_t in_file_id_volatile ;
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struct files_struct * in_fsp ;
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uint32_t in_flags ;
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size_t in_dyn_len = 0 ;
uint8_t * in_dyn_ptr = NULL ;
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struct tevent_req * subreq ;
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status = smbd_smb2_request_verify_sizes ( req , 0x31 ) ;
if ( ! NT_STATUS_IS_OK ( status ) ) {
return smbd_smb2_request_error ( req , status ) ;
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}
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inbody = SMBD_SMB2_IN_BODY_PTR ( req ) ;
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in_data_offset = SVAL ( inbody , 0x02 ) ;
in_data_length = IVAL ( inbody , 0x04 ) ;
in_offset = BVAL ( inbody , 0x08 ) ;
in_file_id_persistent = BVAL ( inbody , 0x10 ) ;
in_file_id_volatile = BVAL ( inbody , 0x18 ) ;
in_flags = IVAL ( inbody , 0x2C ) ;
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if ( in_data_offset ! = ( SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN ( req ) ) ) {
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return smbd_smb2_request_error ( req , NT_STATUS_INVALID_PARAMETER ) ;
}
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if ( req - > smb1req ! = NULL & & req - > smb1req - > unread_bytes > 0 ) {
in_dyn_ptr = NULL ;
in_dyn_len = req - > smb1req - > unread_bytes ;
} else {
in_dyn_ptr = SMBD_SMB2_IN_DYN_PTR ( req ) ;
in_dyn_len = SMBD_SMB2_IN_DYN_LEN ( req ) ;
}
if ( in_data_length > in_dyn_len ) {
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return smbd_smb2_request_error ( req , NT_STATUS_INVALID_PARAMETER ) ;
}
/* check the max write size */
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if ( in_data_length > xconn - > smb2 . server . max_write ) {
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DEBUG ( 2 , ( " smbd_smb2_request_process_write : "
" client ignored max write :%s: 0x%08X: 0x%08X \n " ,
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__location__ , in_data_length , xconn - > smb2 . server . max_write ) ) ;
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return smbd_smb2_request_error ( req , NT_STATUS_INVALID_PARAMETER ) ;
}
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/*
* Note : that in_dyn_ptr is NULL for the recvfile case .
*/
in_data_buffer . data = in_dyn_ptr ;
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in_data_buffer . length = in_data_length ;
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status = smbd_smb2_request_verify_creditcharge ( req , in_data_length ) ;
if ( ! NT_STATUS_IS_OK ( status ) ) {
return smbd_smb2_request_error ( req , status ) ;
}
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in_fsp = file_fsp_smb2 ( req , in_file_id_persistent , in_file_id_volatile ) ;
if ( in_fsp = = NULL ) {
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return smbd_smb2_request_error ( req , NT_STATUS_FILE_CLOSED ) ;
}
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subreq = smbd_smb2_write_send ( req , req - > sconn - > ev_ctx ,
req , in_fsp ,
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in_data_buffer ,
in_offset ,
in_flags ) ;
if ( subreq = = NULL ) {
return smbd_smb2_request_error ( req , NT_STATUS_NO_MEMORY ) ;
}
tevent_req_set_callback ( subreq , smbd_smb2_request_write_done , req ) ;
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return smbd_smb2_request_pending_queue ( req , subreq , 500 ) ;
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}
static void smbd_smb2_request_write_done ( struct tevent_req * subreq )
{
struct smbd_smb2_request * req = tevent_req_callback_data ( subreq ,
struct smbd_smb2_request ) ;
DATA_BLOB outbody ;
DATA_BLOB outdyn ;
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uint32_t out_count = 0 ;
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NTSTATUS status ;
NTSTATUS error ; /* transport error */
status = smbd_smb2_write_recv ( subreq , & out_count ) ;
TALLOC_FREE ( subreq ) ;
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if ( ! NT_STATUS_IS_OK ( status ) ) {
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error = smbd_smb2_request_error ( req , status ) ;
if ( ! NT_STATUS_IS_OK ( error ) ) {
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smbd_server_connection_terminate ( req - > xconn ,
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nt_errstr ( error ) ) ;
return ;
}
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return ;
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}
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outbody = smbd_smb2_generate_outbody ( req , 0x10 ) ;
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if ( outbody . data = = NULL ) {
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error = smbd_smb2_request_error ( req , NT_STATUS_NO_MEMORY ) ;
if ( ! NT_STATUS_IS_OK ( error ) ) {
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smbd_server_connection_terminate ( req - > xconn ,
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nt_errstr ( error ) ) ;
return ;
}
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return ;
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}
SSVAL ( outbody . data , 0x00 , 0x10 + 1 ) ; /* struct size */
SSVAL ( outbody . data , 0x02 , 0 ) ; /* reserved */
SIVAL ( outbody . data , 0x04 , out_count ) ; /* count */
SIVAL ( outbody . data , 0x08 , 0 ) ; /* remaining */
SSVAL ( outbody . data , 0x0C , 0 ) ; /* write channel info offset */
SSVAL ( outbody . data , 0x0E , 0 ) ; /* write channel info length */
outdyn = data_blob_const ( NULL , 0 ) ;
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error = smbd_smb2_request_done ( req , outbody , & outdyn ) ;
if ( ! NT_STATUS_IS_OK ( error ) ) {
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smbd_server_connection_terminate ( req - > xconn , nt_errstr ( error ) ) ;
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return ;
}
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}
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struct smbd_smb2_write_state {
struct smbd_smb2_request * smb2req ;
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struct smb_request * smbreq ;
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files_struct * fsp ;
bool write_through ;
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uint32_t in_length ;
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uint64_t in_offset ;
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uint32_t out_count ;
} ;
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static void smbd_smb2_write_pipe_done ( struct tevent_req * subreq ) ;
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static NTSTATUS smb2_write_complete_internal ( struct tevent_req * req ,
ssize_t nwritten , int err ,
bool do_sync )
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{
NTSTATUS status ;
struct smbd_smb2_write_state * state = tevent_req_data ( req ,
struct smbd_smb2_write_state ) ;
files_struct * fsp = state - > fsp ;
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if ( nwritten = = - 1 ) {
status = map_nt_error_from_unix ( err ) ;
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DEBUG ( 2 , ( " smb2_write failed: %s, file %s, "
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" length=%lu offset=%lu nwritten=-1: %s \n " ,
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fsp_fnum_dbg ( fsp ) ,
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fsp_str_dbg ( fsp ) ,
( unsigned long ) state - > in_length ,
( unsigned long ) state - > in_offset ,
nt_errstr ( status ) ) ) ;
return status ;
}
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DEBUG ( 3 , ( " smb2: %s, file %s, "
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" length=%lu offset=%lu wrote=%lu \n " ,
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fsp_fnum_dbg ( fsp ) ,
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fsp_str_dbg ( fsp ) ,
( unsigned long ) state - > in_length ,
( unsigned long ) state - > in_offset ,
( unsigned long ) nwritten ) ) ;
if ( ( nwritten = = 0 ) & & ( state - > in_length ! = 0 ) ) {
DEBUG ( 5 , ( " smb2: write [%s] disk full \n " ,
fsp_str_dbg ( fsp ) ) ) ;
return NT_STATUS_DISK_FULL ;
}
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if ( do_sync ) {
status = sync_file ( fsp - > conn , fsp , state - > write_through ) ;
if ( ! NT_STATUS_IS_OK ( status ) ) {
DEBUG ( 5 , ( " smb2: sync_file for %s returned %s \n " ,
fsp_str_dbg ( fsp ) ,
nt_errstr ( status ) ) ) ;
return status ;
}
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}
state - > out_count = nwritten ;
return NT_STATUS_OK ;
}
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NTSTATUS smb2_write_complete ( struct tevent_req * req , ssize_t nwritten , int err )
{
return smb2_write_complete_internal ( req , nwritten , err , true ) ;
}
NTSTATUS smb2_write_complete_nosync ( struct tevent_req * req , ssize_t nwritten ,
int err )
{
return smb2_write_complete_internal ( req , nwritten , err , false ) ;
}
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static bool smbd_smb2_write_cancel ( struct tevent_req * req )
{
struct smbd_smb2_write_state * state =
tevent_req_data ( req ,
struct smbd_smb2_write_state ) ;
return cancel_smb2_aio ( state - > smbreq ) ;
}
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static struct tevent_req * smbd_smb2_write_send ( TALLOC_CTX * mem_ctx ,
struct tevent_context * ev ,
struct smbd_smb2_request * smb2req ,
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struct files_struct * fsp ,
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DATA_BLOB in_data ,
uint64_t in_offset ,
uint32_t in_flags )
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{
NTSTATUS status ;
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struct tevent_req * req = NULL ;
struct smbd_smb2_write_state * state = NULL ;
struct smb_request * smbreq = NULL ;
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connection_struct * conn = smb2req - > tcon - > compat ;
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ssize_t nwritten ;
struct lock_struct lock ;
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req = tevent_req_create ( mem_ctx , & state ,
struct smbd_smb2_write_state ) ;
if ( req = = NULL ) {
return NULL ;
}
state - > smb2req = smb2req ;
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if ( in_flags & SMB2_WRITEFLAG_WRITE_THROUGH ) {
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state - > write_through = true ;
}
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state - > in_length = in_data . length ;
state - > out_count = 0 ;
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DEBUG ( 10 , ( " smbd_smb2_write: %s - %s \n " ,
fsp_str_dbg ( fsp ) , fsp_fnum_dbg ( fsp ) ) ) ;
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smbreq = smbd_smb2_fake_smb_request ( smb2req ) ;
if ( tevent_req_nomem ( smbreq , req ) ) {
return tevent_req_post ( req , ev ) ;
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}
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state - > smbreq = smbreq ;
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state - > fsp = fsp ;
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if ( IS_IPC ( smbreq - > conn ) ) {
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struct tevent_req * subreq = NULL ;
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if ( ! fsp_is_np ( fsp ) ) {
tevent_req_nterror ( req , NT_STATUS_FILE_CLOSED ) ;
return tevent_req_post ( req , ev ) ;
}
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subreq = np_write_send ( state , ev ,
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fsp - > fake_file_handle ,
in_data . data ,
in_data . length ) ;
if ( tevent_req_nomem ( subreq , req ) ) {
return tevent_req_post ( req , ev ) ;
}
tevent_req_set_callback ( subreq ,
smbd_smb2_write_pipe_done ,
req ) ;
return req ;
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}
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if ( ! CHECK_WRITE ( fsp ) ) {
tevent_req_nterror ( req , NT_STATUS_ACCESS_DENIED ) ;
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return tevent_req_post ( req , ev ) ;
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}
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/* Try and do an asynchronous write. */
status = schedule_aio_smb2_write ( conn ,
smbreq ,
fsp ,
in_offset ,
in_data ,
state - > write_through ) ;
if ( NT_STATUS_IS_OK ( status ) ) {
/*
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* Doing an async write , allow this
* request to be canceled
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*/
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tevent_req_set_cancel_fn ( req , smbd_smb2_write_cancel ) ;
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return req ;
}
if ( ! NT_STATUS_EQUAL ( status , NT_STATUS_RETRY ) ) {
/* Real error in setting up aio. Fail. */
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tevent_req_nterror ( req , status ) ;
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return tevent_req_post ( req , ev ) ;
}
/* Fallback to synchronous. */
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init_strict_lock_struct ( fsp ,
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fsp - > op - > global - > open_persistent_id ,
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in_offset ,
in_data . length ,
WRITE_LOCK ,
& lock ) ;
if ( ! SMB_VFS_STRICT_LOCK ( conn , fsp , & lock ) ) {
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tevent_req_nterror ( req , NT_STATUS_FILE_LOCK_CONFLICT ) ;
return tevent_req_post ( req , ev ) ;
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}
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/*
* Note : in_data . data is NULL for the recvfile case .
*/
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nwritten = write_file ( smbreq , fsp ,
( const char * ) in_data . data ,
in_offset ,
in_data . length ) ;
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status = smb2_write_complete ( req , nwritten , errno ) ;
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SMB_VFS_STRICT_UNLOCK ( conn , fsp , & lock ) ;
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DEBUG ( 10 , ( " smb2: write on "
" file %s, offset %.0f, requested %u, written = %u \n " ,
fsp_str_dbg ( fsp ) ,
( double ) in_offset ,
( unsigned int ) in_data . length ,
( unsigned int ) nwritten ) ) ;
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if ( ! NT_STATUS_IS_OK ( status ) ) {
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tevent_req_nterror ( req , status ) ;
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} else {
/* Success. */
tevent_req_done ( req ) ;
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}
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return tevent_req_post ( req , ev ) ;
}
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static void smbd_smb2_write_pipe_done ( struct tevent_req * subreq )
{
struct tevent_req * req = tevent_req_callback_data ( subreq ,
struct tevent_req ) ;
struct smbd_smb2_write_state * state = tevent_req_data ( req ,
struct smbd_smb2_write_state ) ;
NTSTATUS status ;
ssize_t nwritten = - 1 ;
status = np_write_recv ( subreq , & nwritten ) ;
TALLOC_FREE ( subreq ) ;
if ( ! NT_STATUS_IS_OK ( status ) ) {
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NTSTATUS old = status ;
status = nt_status_np_pipe ( old ) ;
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tevent_req_nterror ( req , status ) ;
return ;
}
if ( ( nwritten = = 0 & & state - > in_length ! = 0 ) | | ( nwritten < 0 ) ) {
tevent_req_nterror ( req , NT_STATUS_ACCESS_DENIED ) ;
return ;
}
state - > out_count = nwritten ;
tevent_req_done ( req ) ;
}
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static NTSTATUS smbd_smb2_write_recv ( struct tevent_req * req ,
uint32_t * out_count )
{
NTSTATUS status ;
struct smbd_smb2_write_state * state = tevent_req_data ( req ,
struct smbd_smb2_write_state ) ;
if ( tevent_req_is_nterror ( req , & status ) ) {
tevent_req_received ( req ) ;
return status ;
}
* out_count = state - > out_count ;
tevent_req_received ( req ) ;
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return NT_STATUS_OK ;
}