/* 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/smbd.h" #include "smbd/globals.h" #include "../libcli/smb/smb_common.h" #include "../lib/util/tevent_ntstatus.h" #include "rpc_server/srv_pipe_hnd.h" static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev, struct smbd_smb2_request *smb2req, uint32_t in_smbpid, uint64_t in_file_id_volatile, 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); NTSTATUS smbd_smb2_request_process_write(struct smbd_smb2_request *req) { NTSTATUS status; const uint8_t *inhdr; const uint8_t *inbody; int i = req->current_idx; uint32_t in_smbpid; 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; uint32_t in_flags; struct tevent_req *subreq; status = smbd_smb2_request_verify_sizes(req, 0x31); if (!NT_STATUS_IS_OK(status)) { return smbd_smb2_request_error(req, status); } inhdr = (const uint8_t *)req->in.vector[i+0].iov_base; inbody = (const uint8_t *)req->in.vector[i+1].iov_base; in_smbpid = IVAL(inhdr, SMB2_HDR_PID); 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); if (in_data_offset != (SMB2_HDR_BODY + req->in.vector[i+1].iov_len)) { return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER); } if (in_data_length > req->in.vector[i+2].iov_len) { return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER); } /* check the max write size */ if (in_data_length > req->sconn->smb2.max_write) { DEBUG(2,("smbd_smb2_request_process_write : " "client ignored max write :%s: 0x%08X: 0x%08X\n", __location__, in_data_length, req->sconn->smb2.max_write)); return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER); } in_data_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base; in_data_buffer.length = in_data_length; if (req->compat_chain_fsp) { /* skip check */ } else if (in_file_id_persistent != in_file_id_volatile) { return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED); } subreq = smbd_smb2_write_send(req, req->sconn->smb2.event_ctx, req, in_smbpid, in_file_id_volatile, 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); return smbd_smb2_request_pending_queue(req, subreq, 500); } 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); int i = req->current_idx; uint8_t *outhdr; DATA_BLOB outbody; DATA_BLOB outdyn; uint32_t out_count = 0; NTSTATUS status; NTSTATUS error; /* transport error */ status = smbd_smb2_write_recv(subreq, &out_count); 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; } outhdr = (uint8_t *)req->out.vector[i].iov_base; outbody = data_blob_talloc(req->out.vector, NULL, 0x10); 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, 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); 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_write_state { struct smbd_smb2_request *smb2req; struct smb_request *smbreq; files_struct *fsp; bool write_through; uint32_t in_length; uint64_t in_offset; uint32_t out_count; }; static void smbd_smb2_write_pipe_done(struct tevent_req *subreq); NTSTATUS smb2_write_complete(struct tevent_req *req, ssize_t nwritten, int err) { NTSTATUS status; struct smbd_smb2_write_state *state = tevent_req_data(req, struct smbd_smb2_write_state); files_struct *fsp = state->fsp; DEBUG(3,("smb2: fnum=[%d/%s] " "length=%lu offset=%lu wrote=%lu\n", fsp->fnum, fsp_str_dbg(fsp), (unsigned long)state->in_length, (unsigned long)state->in_offset, (unsigned long)nwritten)); if (nwritten == -1) { return map_nt_error_from_unix(err); } if ((nwritten == 0) && (state->in_length != 0)) { DEBUG(5,("smb2: write [%s] disk full\n", fsp_str_dbg(fsp))); return NT_STATUS_DISK_FULL; } 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; } state->out_count = nwritten; return NT_STATUS_OK; } 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); state->smb2req->cancelled = true; return cancel_smb2_aio(state->smbreq); } static struct tevent_req *smbd_smb2_write_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev, struct smbd_smb2_request *smb2req, uint32_t in_smbpid, uint64_t in_file_id_volatile, DATA_BLOB in_data, uint64_t in_offset, uint32_t in_flags) { NTSTATUS status; struct tevent_req *req = NULL; struct smbd_smb2_write_state *state = NULL; struct smb_request *smbreq = NULL; connection_struct *conn = smb2req->tcon->compat_conn; files_struct *fsp = NULL; ssize_t nwritten; struct lock_struct lock; req = tevent_req_create(mem_ctx, &state, struct smbd_smb2_write_state); if (req == NULL) { return NULL; } state->smb2req = smb2req; if (in_flags & SMB2_WRITEFLAG_WRITE_THROUGH) { state->write_through = true; } state->in_length = in_data.length; state->out_count = 0; DEBUG(10,("smbd_smb2_write: 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; 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); } state->fsp = fsp; if (IS_IPC(smbreq->conn)) { struct tevent_req *subreq = NULL; if (!fsp_is_np(fsp)) { tevent_req_nterror(req, NT_STATUS_FILE_CLOSED); return tevent_req_post(req, ev); } subreq = np_write_send(state, server_event_context(), 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; } if (!CHECK_WRITE(fsp)) { tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED); return tevent_req_post(req, ev); } /* 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)) { /* * Doing an async write, allow this * request to be canceled */ tevent_req_set_cancel_fn(req, smbd_smb2_write_cancel); return req; } if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) { /* Real error in setting up aio. Fail. */ tevent_req_nterror(req, NT_STATUS_FILE_CLOSED); return tevent_req_post(req, ev); } /* Fallback to synchronous. */ init_strict_lock_struct(fsp, in_file_id_volatile, in_offset, in_data.length, WRITE_LOCK, &lock); if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) { tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT); return tevent_req_post(req, ev); } nwritten = write_file(smbreq, fsp, (const char *)in_data.data, in_offset, in_data.length); status = smb2_write_complete(req, nwritten, errno); SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock); 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 )); if (!NT_STATUS_IS_OK(status)) { tevent_req_nterror(req, status); } else { /* Success. */ tevent_req_done(req); } return tevent_req_post(req, ev); } 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)) { 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); } 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); return NT_STATUS_OK; }