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https://github.com/samba-team/samba.git
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414 lines
11 KiB
C
414 lines
11 KiB
C
/*
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Unix SMB/CIFS implementation.
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Core SMB2 server
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Copyright (C) Stefan Metzmacher 2009
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#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,
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struct tevent_context *ev,
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struct smbd_smb2_request *smb2req,
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struct files_struct *in_fsp,
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DATA_BLOB in_data,
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uint64_t in_offset,
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uint32_t in_flags);
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static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
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uint32_t *out_count);
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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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{
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NTSTATUS status;
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const uint8_t *inbody;
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uint16_t in_data_offset;
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uint32_t in_data_length;
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DATA_BLOB in_data_buffer;
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uint64_t in_offset;
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uint64_t in_file_id_persistent;
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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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struct tevent_req *subreq;
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status = smbd_smb2_request_verify_sizes(req, 0x31);
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if (!NT_STATUS_IS_OK(status)) {
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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);
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in_data_length = IVAL(inbody, 0x04);
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in_offset = BVAL(inbody, 0x08);
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in_file_id_persistent = BVAL(inbody, 0x10);
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in_file_id_volatile = BVAL(inbody, 0x18);
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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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}
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if (in_data_length > SMBD_SMB2_IN_DYN_LEN(req)) {
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return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
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}
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/* check the max write size */
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if (in_data_length > req->sconn->smb2.max_write) {
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DEBUG(2,("smbd_smb2_request_process_write : "
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"client ignored max write :%s: 0x%08X: 0x%08X\n",
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__location__, in_data_length, req->sconn->smb2.max_write));
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return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
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}
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in_data_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
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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);
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if (!NT_STATUS_IS_OK(status)) {
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return smbd_smb2_request_error(req, status);
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}
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in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
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if (in_fsp == NULL) {
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return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
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}
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subreq = smbd_smb2_write_send(req, req->sconn->ev_ctx,
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req, in_fsp,
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in_data_buffer,
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in_offset,
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in_flags);
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if (subreq == NULL) {
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return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
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}
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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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}
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static void smbd_smb2_request_write_done(struct tevent_req *subreq)
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{
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struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
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struct smbd_smb2_request);
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DATA_BLOB outbody;
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DATA_BLOB outdyn;
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uint32_t out_count = 0;
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NTSTATUS status;
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NTSTATUS error; /* transport error */
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status = smbd_smb2_write_recv(subreq, &out_count);
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TALLOC_FREE(subreq);
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if (!NT_STATUS_IS_OK(status)) {
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error = smbd_smb2_request_error(req, status);
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if (!NT_STATUS_IS_OK(error)) {
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smbd_server_connection_terminate(req->sconn,
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nt_errstr(error));
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return;
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}
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return;
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}
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outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
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if (outbody.data == NULL) {
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error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
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if (!NT_STATUS_IS_OK(error)) {
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smbd_server_connection_terminate(req->sconn,
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nt_errstr(error));
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return;
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}
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return;
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}
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SSVAL(outbody.data, 0x00, 0x10 + 1); /* struct size */
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SSVAL(outbody.data, 0x02, 0); /* reserved */
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SIVAL(outbody.data, 0x04, out_count); /* count */
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SIVAL(outbody.data, 0x08, 0); /* remaining */
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SSVAL(outbody.data, 0x0C, 0); /* write channel info offset */
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SSVAL(outbody.data, 0x0E, 0); /* write channel info length */
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outdyn = data_blob_const(NULL, 0);
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error = smbd_smb2_request_done(req, outbody, &outdyn);
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if (!NT_STATUS_IS_OK(error)) {
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smbd_server_connection_terminate(req->sconn, nt_errstr(error));
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return;
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}
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}
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struct smbd_smb2_write_state {
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struct smbd_smb2_request *smb2req;
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struct smb_request *smbreq;
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files_struct *fsp;
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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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};
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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,
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ssize_t nwritten, int err,
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bool do_sync)
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{
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NTSTATUS status;
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struct smbd_smb2_write_state *state = tevent_req_data(req,
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struct smbd_smb2_write_state);
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files_struct *fsp = state->fsp;
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if (nwritten == -1) {
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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),
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(unsigned long)state->in_length,
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(unsigned long)state->in_offset,
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nt_errstr(status)));
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return status;
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}
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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),
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(unsigned long)state->in_length,
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(unsigned long)state->in_offset,
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(unsigned long)nwritten));
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if ((nwritten == 0) && (state->in_length != 0)) {
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DEBUG(5,("smb2: write [%s] disk full\n",
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fsp_str_dbg(fsp)));
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return NT_STATUS_DISK_FULL;
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}
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if (do_sync) {
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status = sync_file(fsp->conn, fsp, state->write_through);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(5,("smb2: sync_file for %s returned %s\n",
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fsp_str_dbg(fsp),
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nt_errstr(status)));
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return status;
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}
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}
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state->out_count = nwritten;
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return NT_STATUS_OK;
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}
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NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err)
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{
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return smb2_write_complete_internal(req, nwritten, err, true);
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}
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NTSTATUS smb2_write_complete_nosync(struct tevent_req *req, ssize_t nwritten,
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int err)
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{
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return smb2_write_complete_internal(req, nwritten, err, false);
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}
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static bool smbd_smb2_write_cancel(struct tevent_req *req)
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{
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struct smbd_smb2_write_state *state =
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tevent_req_data(req,
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struct smbd_smb2_write_state);
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return cancel_smb2_aio(state->smbreq);
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}
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static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct smbd_smb2_request *smb2req,
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struct files_struct *fsp,
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DATA_BLOB in_data,
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uint64_t in_offset,
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uint32_t in_flags)
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{
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NTSTATUS status;
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struct tevent_req *req = NULL;
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struct smbd_smb2_write_state *state = NULL;
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struct smb_request *smbreq = NULL;
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connection_struct *conn = smb2req->tcon->compat;
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ssize_t nwritten;
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struct lock_struct lock;
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req = tevent_req_create(mem_ctx, &state,
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struct smbd_smb2_write_state);
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if (req == NULL) {
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return NULL;
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}
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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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}
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state->in_length = in_data.length;
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state->out_count = 0;
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DEBUG(10,("smbd_smb2_write: %s - %s\n",
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fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
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smbreq = smbd_smb2_fake_smb_request(smb2req);
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if (tevent_req_nomem(smbreq, req)) {
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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)) {
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tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
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return tevent_req_post(req, ev);
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}
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subreq = np_write_send(state, ev,
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fsp->fake_file_handle,
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in_data.data,
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in_data.length);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq,
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smbd_smb2_write_pipe_done,
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req);
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return req;
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}
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if (!CHECK_WRITE(fsp)) {
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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. */
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status = schedule_aio_smb2_write(conn,
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smbreq,
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fsp,
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in_offset,
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in_data,
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state->write_through);
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if (NT_STATUS_IS_OK(status)) {
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/*
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* Doing an async write, allow this
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* 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;
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}
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if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
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/* 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);
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}
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/* 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,
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in_data.length,
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WRITE_LOCK,
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&lock);
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if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
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tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
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return tevent_req_post(req, ev);
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}
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nwritten = write_file(smbreq, fsp,
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(const char *)in_data.data,
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in_offset,
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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 "
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"file %s, offset %.0f, requested %u, written = %u\n",
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fsp_str_dbg(fsp),
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(double)in_offset,
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(unsigned int)in_data.length,
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(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 {
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/* Success. */
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tevent_req_done(req);
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}
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return tevent_req_post(req, ev);
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}
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static void smbd_smb2_write_pipe_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(subreq,
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struct tevent_req);
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struct smbd_smb2_write_state *state = tevent_req_data(req,
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struct smbd_smb2_write_state);
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NTSTATUS status;
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ssize_t nwritten = -1;
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status = np_write_recv(subreq, &nwritten);
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TALLOC_FREE(subreq);
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if (!NT_STATUS_IS_OK(status)) {
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NTSTATUS old = status;
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status = nt_status_np_pipe(old);
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tevent_req_nterror(req, status);
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return;
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}
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if ((nwritten == 0 && state->in_length != 0) || (nwritten < 0)) {
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tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
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return;
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}
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state->out_count = nwritten;
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tevent_req_done(req);
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}
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static NTSTATUS smbd_smb2_write_recv(struct tevent_req *req,
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uint32_t *out_count)
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{
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NTSTATUS status;
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struct smbd_smb2_write_state *state = tevent_req_data(req,
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struct smbd_smb2_write_state);
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if (tevent_req_is_nterror(req, &status)) {
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tevent_req_received(req);
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return status;
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}
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*out_count = state->out_count;
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tevent_req_received(req);
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return NT_STATUS_OK;
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}
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