/* 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" #include "smbd/globals.h" #include "../libcli/smb/smb_common.h" static struct tevent_req *smbd_smb2_notify_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev, struct smbd_smb2_request *smb2req, uint16_t in_flags, uint32_t in_output_buffer_length, uint64_t in_file_id_volatile, uint64_t in_completion_filter); static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, DATA_BLOB *out_output_buffer); static void smbd_smb2_request_notify_done(struct tevent_req *subreq); NTSTATUS smbd_smb2_request_process_notify(struct smbd_smb2_request *req) { const uint8_t *inhdr; const uint8_t *inbody; int i = req->current_idx; size_t expected_body_size = 0x20; size_t body_size; uint16_t in_flags; uint32_t in_output_buffer_length; uint64_t in_file_id_persistent; uint64_t in_file_id_volatile; uint64_t in_completion_filter; struct tevent_req *subreq; inhdr = (const uint8_t *)req->in.vector[i+0].iov_base; if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) { return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER); } inbody = (const uint8_t *)req->in.vector[i+1].iov_base; body_size = SVAL(inbody, 0x00); if (body_size != expected_body_size) { return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER); } in_flags = SVAL(inbody, 0x02); in_output_buffer_length = IVAL(inbody, 0x04); in_file_id_persistent = BVAL(inbody, 0x08); in_file_id_volatile = BVAL(inbody, 0x10); in_completion_filter = IVAL(inbody, 0x18); /* * 0x00010000 is what Windows 7 uses, * Windows 2008 uses 0x00080000 */ if (in_output_buffer_length > 0x00010000) { return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER); } if (req->compat_chain_fsp) { /* skip check */ } else if (in_file_id_persistent != 0) { return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED); } subreq = smbd_smb2_notify_send(req, req->sconn->smb2.event_ctx, req, in_flags, in_output_buffer_length, in_file_id_volatile, in_completion_filter); if (subreq == NULL) { return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY); } tevent_req_set_callback(subreq, smbd_smb2_request_notify_done, req); return smbd_smb2_request_pending_queue(req, subreq); } static void smbd_smb2_request_notify_done(struct tevent_req *subreq) { struct smbd_smb2_request *req = tevent_req_callback_data(subreq, struct smbd_smb2_request); int i = req->current_idx; uint8_t *outhdr; DATA_BLOB outbody; DATA_BLOB outdyn; uint16_t out_output_buffer_offset; DATA_BLOB out_output_buffer = data_blob_null; NTSTATUS status; NTSTATUS error; /* transport error */ status = smbd_smb2_notify_recv(subreq, req, &out_output_buffer); TALLOC_FREE(subreq); if (!NT_STATUS_IS_OK(status)) { error = smbd_smb2_request_error(req, status); if (!NT_STATUS_IS_OK(error)) { smbd_server_connection_terminate(req->sconn, nt_errstr(error)); return; } return; } out_output_buffer_offset = SMB2_HDR_BODY + 0x08; outhdr = (uint8_t *)req->out.vector[i].iov_base; outbody = data_blob_talloc(req->out.vector, NULL, 0x08); if (outbody.data == NULL) { error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY); if (!NT_STATUS_IS_OK(error)) { smbd_server_connection_terminate(req->sconn, nt_errstr(error)); return; } return; } SSVAL(outbody.data, 0x00, 0x08 + 1); /* struct size */ SSVAL(outbody.data, 0x02, out_output_buffer_offset); /* output buffer offset */ SIVAL(outbody.data, 0x04, out_output_buffer.length); /* output buffer length */ outdyn = out_output_buffer; error = smbd_smb2_request_done(req, outbody, &outdyn); if (!NT_STATUS_IS_OK(error)) { smbd_server_connection_terminate(req->sconn, nt_errstr(error)); return; } } struct smbd_smb2_notify_state { struct smbd_smb2_request *smb2req; struct smb_request *smbreq; struct tevent_immediate *im; NTSTATUS status; DATA_BLOB out_output_buffer; }; static void smbd_smb2_notify_reply(struct smb_request *smbreq, NTSTATUS error_code, uint8_t *buf, size_t len); static void smbd_smb2_notify_reply_trigger(struct tevent_context *ctx, struct tevent_immediate *im, void *private_data); static bool smbd_smb2_notify_cancel(struct tevent_req *req); static struct tevent_req *smbd_smb2_notify_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev, struct smbd_smb2_request *smb2req, uint16_t in_flags, uint32_t in_output_buffer_length, uint64_t in_file_id_volatile, uint64_t in_completion_filter) { struct tevent_req *req; struct smbd_smb2_notify_state *state; struct smb_request *smbreq; connection_struct *conn = smb2req->tcon->compat_conn; files_struct *fsp; bool recursive = (in_flags & 0x0001) ? true : false; NTSTATUS status; req = tevent_req_create(mem_ctx, &state, struct smbd_smb2_notify_state); if (req == NULL) { return NULL; } state->smb2req = smb2req; state->status = NT_STATUS_INTERNAL_ERROR; state->out_output_buffer = data_blob_null; state->im = NULL; DEBUG(10,("smbd_smb2_notify_send: file_id[0x%016llX]\n", (unsigned long long)in_file_id_volatile)); smbreq = smbd_smb2_fake_smb_request(smb2req); if (tevent_req_nomem(smbreq, req)) { return tevent_req_post(req, ev); } state->smbreq = smbreq; smbreq->async_priv = (void *)req; fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile); if (fsp == NULL) { tevent_req_nterror(req, NT_STATUS_FILE_CLOSED); return tevent_req_post(req, ev); } if (conn != fsp->conn) { tevent_req_nterror(req, NT_STATUS_FILE_CLOSED); return tevent_req_post(req, ev); } if (smb2req->session->vuid != fsp->vuid) { tevent_req_nterror(req, NT_STATUS_FILE_CLOSED); return tevent_req_post(req, ev); } { char *filter_string; filter_string = notify_filter_string(NULL, in_completion_filter); if (tevent_req_nomem(filter_string, req)) { return tevent_req_post(req, ev); } DEBUG(3,("smbd_smb2_notify_send: notify change " "called on %s, filter = %s, recursive = %d\n", fsp_str_dbg(fsp), filter_string, recursive)); TALLOC_FREE(filter_string); } if ((!fsp->is_directory) || (conn != fsp->conn)) { tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER); return tevent_req_post(req, ev); } if (fsp->notify == NULL) { status = change_notify_create(fsp, in_completion_filter, recursive); if (!NT_STATUS_IS_OK(status)) { DEBUG(10, ("change_notify_create returned %s\n", nt_errstr(status))); tevent_req_nterror(req, status); return tevent_req_post(req, ev); } } if (fsp->notify->num_changes != 0) { /* * We've got changes pending, respond immediately */ /* * TODO: write a torture test to check the filtering behaviour * here. */ change_notify_reply(fsp->conn, smbreq, NT_STATUS_OK, in_output_buffer_length, fsp->notify, smbd_smb2_notify_reply); /* * change_notify_reply() above has independently * called tevent_req_done(). */ return tevent_req_post(req, ev); } state->im = tevent_create_immediate(state); if (tevent_req_nomem(state->im, req)) { return tevent_req_post(req, ev); } /* * No changes pending, queue the request */ status = change_notify_add_request(smbreq, in_output_buffer_length, in_completion_filter, recursive, fsp, smbd_smb2_notify_reply); if (!NT_STATUS_IS_OK(status)) { tevent_req_nterror(req, status); return tevent_req_post(req, ev); } /* allow this request to be canceled */ tevent_req_set_cancel_fn(req, smbd_smb2_notify_cancel); return req; } static void smbd_smb2_notify_reply(struct smb_request *smbreq, NTSTATUS error_code, uint8_t *buf, size_t len) { struct tevent_req *req = talloc_get_type_abort(smbreq->async_priv, struct tevent_req); struct smbd_smb2_notify_state *state = tevent_req_data(req, struct smbd_smb2_notify_state); state->status = error_code; if (!NT_STATUS_IS_OK(error_code)) { /* nothing */ } else if (len == 0) { state->status = STATUS_NOTIFY_ENUM_DIR; } else { state->out_output_buffer = data_blob_talloc(state, buf, len); if (state->out_output_buffer.data == NULL) { state->status = NT_STATUS_NO_MEMORY; } } if (state->im == NULL) { smbd_smb2_notify_reply_trigger(NULL, NULL, req); return; } /* * if this is called async, we need to go via an immediate event * because the caller replies on the smb_request (a child of req * being arround after calling this function */ tevent_schedule_immediate(state->im, state->smb2req->sconn->smb2.event_ctx, smbd_smb2_notify_reply_trigger, req); } static void smbd_smb2_notify_reply_trigger(struct tevent_context *ctx, struct tevent_immediate *im, void *private_data) { struct tevent_req *req = talloc_get_type_abort(private_data, struct tevent_req); struct smbd_smb2_notify_state *state = tevent_req_data(req, struct smbd_smb2_notify_state); if (!NT_STATUS_IS_OK(state->status)) { tevent_req_nterror(req, state->status); return; } tevent_req_done(req); } static bool smbd_smb2_notify_cancel(struct tevent_req *req) { struct smbd_smb2_notify_state *state = tevent_req_data(req, struct smbd_smb2_notify_state); smbd_notify_cancel_by_smbreq(state->smb2req->sconn, state->smbreq); return true; } static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, DATA_BLOB *out_output_buffer) { NTSTATUS status; struct smbd_smb2_notify_state *state = tevent_req_data(req, struct smbd_smb2_notify_state); if (tevent_req_is_nterror(req, &status)) { tevent_req_received(req); return status; } *out_output_buffer = state->out_output_buffer; talloc_steal(mem_ctx, out_output_buffer->data); tevent_req_received(req); return NT_STATUS_OK; }