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d86f9ff7fd
This is exactly the application talloc_tos() was made for Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org> Autobuild-User(master): Jeremy Allison <jra@samba.org> Autobuild-Date(master): Mon Jun 24 17:27:04 UTC 2024 on atb-devel-224
385 lines
10 KiB
C
385 lines
10 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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Copyright (C) Jeremy Allison 2010
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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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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_SMB2
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struct smbd_smb2_notify_state {
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struct smbd_smb2_request *smb2req;
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struct smb_request *smbreq;
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bool has_request;
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bool skip_reply;
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NTSTATUS status;
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DATA_BLOB out_output_buffer;
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};
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static struct tevent_req *smbd_smb2_notify_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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uint16_t in_flags,
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uint32_t in_output_buffer_length,
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uint64_t in_completion_filter);
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static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req,
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TALLOC_CTX *mem_ctx,
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DATA_BLOB *out_output_buffer);
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static void smbd_smb2_request_notify_done(struct tevent_req *subreq);
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NTSTATUS smbd_smb2_request_process_notify(struct smbd_smb2_request *req)
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{
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struct smbXsrv_connection *xconn = req->xconn;
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NTSTATUS status;
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const uint8_t *inbody;
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uint16_t in_flags;
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uint32_t in_output_buffer_length;
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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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uint64_t in_completion_filter;
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struct tevent_req *subreq;
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status = smbd_smb2_request_verify_sizes(req, 0x20);
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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_flags = SVAL(inbody, 0x02);
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in_output_buffer_length = IVAL(inbody, 0x04);
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in_file_id_persistent = BVAL(inbody, 0x08);
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in_file_id_volatile = BVAL(inbody, 0x10);
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in_completion_filter = IVAL(inbody, 0x18);
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/*
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* 0x00010000 is what Windows 7 uses,
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* Windows 2008 uses 0x00080000
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*/
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if (in_output_buffer_length > xconn->smb2.server.max_trans) {
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return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
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}
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status = smbd_smb2_request_verify_creditcharge(req,
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in_output_buffer_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_notify_send(req, req->sconn->ev_ctx,
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req, in_fsp,
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in_flags,
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in_output_buffer_length,
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in_completion_filter);
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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_notify_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_notify_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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uint16_t out_output_buffer_offset;
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DATA_BLOB out_output_buffer = data_blob_null;
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NTSTATUS status;
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NTSTATUS error; /* transport error */
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status = smbd_smb2_notify_recv(subreq,
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req,
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&out_output_buffer);
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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->xconn,
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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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out_output_buffer_offset = SMB2_HDR_BODY + 0x08;
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outbody = smbd_smb2_generate_outbody(req, 0x08);
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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->xconn,
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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, 0x08 + 1); /* struct size */
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SSVAL(outbody.data, 0x02,
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out_output_buffer_offset); /* output buffer offset */
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SIVAL(outbody.data, 0x04,
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out_output_buffer.length); /* output buffer length */
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outdyn = out_output_buffer;
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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->xconn,
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nt_errstr(error));
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return;
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}
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}
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static void smbd_smb2_notify_reply(struct smb_request *smbreq,
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NTSTATUS error_code,
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uint8_t *buf, size_t len);
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static bool smbd_smb2_notify_cancel(struct tevent_req *req);
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static int smbd_smb2_notify_state_destructor(struct smbd_smb2_notify_state *state)
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{
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if (!state->has_request) {
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return 0;
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}
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state->skip_reply = true;
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smbd_notify_cancel_by_smbreq(state->smbreq);
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return 0;
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}
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static int smbd_smb2_notify_smbreq_destructor(struct smb_request *smbreq)
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{
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struct tevent_req *req = talloc_get_type_abort(smbreq->async_priv,
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struct tevent_req);
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struct smbd_smb2_notify_state *state = tevent_req_data(req,
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struct smbd_smb2_notify_state);
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/*
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* Our temporary parent from change_notify_add_request()
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* goes away.
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*/
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state->has_request = false;
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/*
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* move it back to its original parent,
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* which means we no longer need the destructor
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* to protect it.
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*/
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talloc_steal(smbreq->smb2req, smbreq);
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talloc_set_destructor(smbreq, NULL);
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/*
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* We want to keep smbreq!
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*/
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return -1;
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}
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static struct tevent_req *smbd_smb2_notify_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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uint16_t in_flags,
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uint32_t in_output_buffer_length,
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uint64_t in_completion_filter)
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{
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struct tevent_req *req;
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struct smbd_smb2_notify_state *state;
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struct smb_request *smbreq;
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connection_struct *conn = smb2req->tcon->compat;
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bool recursive = (in_flags & SMB2_WATCH_TREE) ? true : false;
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NTSTATUS status;
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req = tevent_req_create(mem_ctx, &state,
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struct smbd_smb2_notify_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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state->status = NT_STATUS_INTERNAL_ERROR;
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state->out_output_buffer = data_blob_null;
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talloc_set_destructor(state, smbd_smb2_notify_state_destructor);
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DEBUG(10,("smbd_smb2_notify_send: %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, fsp);
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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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smbreq->async_priv = (void *)req;
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DBG_NOTICE("notify change called on %s, filter = %s, recursive = %d\n",
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fsp_str_dbg(fsp),
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notify_filter_string(talloc_tos(), in_completion_filter),
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recursive);
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if ((!fsp->fsp_flags.is_directory) || (conn != fsp->conn)) {
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tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
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return tevent_req_post(req, ev);
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}
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if (fsp->notify == NULL) {
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status = change_notify_create(fsp,
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in_output_buffer_length,
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in_completion_filter,
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recursive);
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if (tevent_req_nterror(req, status)) {
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DEBUG(10, ("change_notify_create returned %s\n",
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nt_errstr(status)));
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return tevent_req_post(req, ev);
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}
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}
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if (change_notify_fsp_has_changes(fsp)) {
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/*
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* We've got changes pending, respond immediately
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*/
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/*
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* TODO: write a torture test to check the filtering behaviour
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* here.
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*/
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change_notify_reply(smbreq,
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NT_STATUS_OK,
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in_output_buffer_length,
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fsp->notify,
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smbd_smb2_notify_reply);
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/*
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* change_notify_reply() above has independently
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* called tevent_req_done().
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*/
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return tevent_req_post(req, ev);
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}
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/*
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* No changes pending, queue the request
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*/
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status = change_notify_add_request(smbreq,
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in_output_buffer_length,
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in_completion_filter,
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recursive, fsp,
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smbd_smb2_notify_reply);
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if (tevent_req_nterror(req, status)) {
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return tevent_req_post(req, ev);
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}
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/*
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* This is a HACK!
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*
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* change_notify_add_request() talloc_moves()
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* smbreq away from us, so we need a destructor
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* which moves it back at the end.
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*/
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state->has_request = true;
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talloc_set_destructor(smbreq, smbd_smb2_notify_smbreq_destructor);
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/* allow this request to be canceled */
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tevent_req_set_cancel_fn(req, smbd_smb2_notify_cancel);
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SMBPROFILE_IOBYTES_ASYNC_SET_IDLE(state->smb2req->profile);
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return req;
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}
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static void smbd_smb2_notify_reply(struct smb_request *smbreq,
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NTSTATUS error_code,
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uint8_t *buf, size_t len)
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{
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struct tevent_req *req = talloc_get_type_abort(smbreq->async_priv,
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struct tevent_req);
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struct smbd_smb2_notify_state *state = tevent_req_data(req,
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struct smbd_smb2_notify_state);
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if (state->skip_reply) {
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return;
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}
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SMBPROFILE_IOBYTES_ASYNC_SET_BUSY(state->smb2req->profile);
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state->status = error_code;
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if (!NT_STATUS_IS_OK(error_code)) {
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/* nothing */
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} else if (len == 0) {
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state->status = NT_STATUS_NOTIFY_ENUM_DIR;
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} else {
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state->out_output_buffer = data_blob_talloc(state, buf, len);
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if (state->out_output_buffer.data == NULL) {
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state->status = NT_STATUS_NO_MEMORY;
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}
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}
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tevent_req_defer_callback(req, state->smb2req->sconn->ev_ctx);
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if (tevent_req_nterror(req, state->status)) {
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return;
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}
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tevent_req_done(req);
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}
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static bool smbd_smb2_notify_cancel(struct tevent_req *req)
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{
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struct smbd_smb2_notify_state *state = tevent_req_data(req,
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struct smbd_smb2_notify_state);
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smbd_notify_cancel_by_smbreq(state->smbreq);
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return true;
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}
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static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req,
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TALLOC_CTX *mem_ctx,
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DATA_BLOB *out_output_buffer)
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{
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NTSTATUS status;
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struct smbd_smb2_notify_state *state = tevent_req_data(req,
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struct smbd_smb2_notify_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_output_buffer = state->out_output_buffer;
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talloc_steal(mem_ctx, out_output_buffer->data);
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tevent_req_received(req);
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return NT_STATUS_OK;
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}
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