/* Unix SMB/CIFS implementation. Core SMB2 server Copyright (C) Stefan Metzmacher 2009 Copyright (C) Jeremy Allison 2010 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" static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev, struct smbd_smb2_request *smb2req, uint8_t in_oplock_level, uint64_t in_file_id_volatile); static NTSTATUS smbd_smb2_oplock_break_recv(struct tevent_req *req, uint8_t *out_oplock_level); static void smbd_smb2_request_oplock_break_done(struct tevent_req *subreq); NTSTATUS smbd_smb2_request_process_break(struct smbd_smb2_request *req) { NTSTATUS status; const uint8_t *inbody; int i = req->current_idx; uint8_t in_oplock_level; uint64_t in_file_id_persistent; uint64_t in_file_id_volatile; struct tevent_req *subreq; status = smbd_smb2_request_verify_sizes(req, 0x18); if (!NT_STATUS_IS_OK(status)) { return smbd_smb2_request_error(req, status); } inbody = (const uint8_t *)req->in.vector[i+1].iov_base; in_oplock_level = CVAL(inbody, 0x02); if (in_oplock_level != SMB2_OPLOCK_LEVEL_NONE && in_oplock_level != SMB2_OPLOCK_LEVEL_II) { return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER); } /* 0x03 1 bytes reserved */ /* 0x04 4 bytes reserved */ in_file_id_persistent = BVAL(inbody, 0x08); in_file_id_volatile = BVAL(inbody, 0x10); 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_oplock_break_send(req, req->sconn->smb2.event_ctx, req, in_oplock_level, in_file_id_volatile); if (subreq == NULL) { return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY); } tevent_req_set_callback(subreq, smbd_smb2_request_oplock_break_done, req); return smbd_smb2_request_pending_queue(req, subreq); } static void smbd_smb2_request_oplock_break_done(struct tevent_req *subreq) { struct smbd_smb2_request *req = tevent_req_callback_data(subreq, struct smbd_smb2_request); const uint8_t *inbody; int i = req->current_idx; uint64_t in_file_id_persistent; uint64_t in_file_id_volatile; uint8_t out_oplock_level = 0; DATA_BLOB outbody; NTSTATUS status; NTSTATUS error; /* transport error */ status = smbd_smb2_oplock_break_recv(subreq, &out_oplock_level); 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; } inbody = (const uint8_t *)req->in.vector[i+1].iov_base; in_file_id_persistent = BVAL(inbody, 0x08); in_file_id_volatile = BVAL(inbody, 0x10); outbody = data_blob_talloc(req->out.vector, NULL, 0x18); 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, 0x18); /* struct size */ SCVAL(outbody.data, 0x02, out_oplock_level); /* SMB2 oplock level */ SCVAL(outbody.data, 0x03, 0); /* reserved */ SIVAL(outbody.data, 0x04, 0); /* reserved */ SBVAL(outbody.data, 0x08, in_file_id_persistent); /* file id (persistent) */ SBVAL(outbody.data, 0x10, in_file_id_volatile); /* file id (volatile) */ error = smbd_smb2_request_done(req, outbody, NULL); if (!NT_STATUS_IS_OK(error)) { smbd_server_connection_terminate(req->sconn, nt_errstr(error)); return; } } struct smbd_smb2_oplock_break_state { struct smbd_smb2_request *smb2req; uint8_t out_oplock_level; /* SMB2 oplock level. */ }; static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev, struct smbd_smb2_request *smb2req, uint8_t in_oplock_level, uint64_t in_file_id_volatile) { struct tevent_req *req; struct smbd_smb2_oplock_break_state *state; struct smb_request *smbreq; connection_struct *conn = smb2req->tcon->compat_conn; files_struct *fsp = NULL; int oplocklevel = map_smb2_oplock_levels_to_samba(in_oplock_level); bool break_to_none = (oplocklevel == NO_OPLOCK); bool result; req = tevent_req_create(mem_ctx, &state, struct smbd_smb2_oplock_break_state); if (req == NULL) { return NULL; } state->smb2req = smb2req; state->out_oplock_level = SMB2_OPLOCK_LEVEL_NONE; DEBUG(10,("smbd_smb2_oplock_break_send: file_id[0x%016llX] " "samba level %d\n", (unsigned long long)in_file_id_volatile, oplocklevel)); smbreq = smbd_smb2_fake_smb_request(smb2req); if (tevent_req_nomem(smbreq, req)) { return tevent_req_post(req, ev); } 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); } DEBUG(5,("smbd_smb2_oplock_break_send: got SMB2 oplock break (%u) from client " "for file %s fnum = %d\n", (unsigned int)in_oplock_level, fsp_str_dbg(fsp), fsp->fnum )); /* Are we awaiting a break message ? */ if (fsp->oplock_timeout == NULL) { tevent_req_nterror(req, NT_STATUS_INVALID_OPLOCK_PROTOCOL); return tevent_req_post(req, ev); } if ((fsp->sent_oplock_break == BREAK_TO_NONE_SENT) || (break_to_none)) { result = remove_oplock(fsp); state->out_oplock_level = SMB2_OPLOCK_LEVEL_NONE; } else { result = downgrade_oplock(fsp); state->out_oplock_level = SMB2_OPLOCK_LEVEL_II; } if (!result) { DEBUG(0, ("smbd_smb2_oplock_break_send: error in removing " "oplock on file %s\n", fsp_str_dbg(fsp))); /* Hmmm. Is this panic justified? */ smb_panic("internal tdb error"); } reply_to_oplock_break_requests(fsp); tevent_req_done(req); return tevent_req_post(req, ev); } static NTSTATUS smbd_smb2_oplock_break_recv(struct tevent_req *req, uint8_t *out_oplock_level) { NTSTATUS status; struct smbd_smb2_oplock_break_state *state = tevent_req_data(req, struct smbd_smb2_oplock_break_state); if (tevent_req_is_nterror(req, &status)) { tevent_req_received(req); return status; } *out_oplock_level = state->out_oplock_level; tevent_req_received(req); return NT_STATUS_OK; } /********************************************************* Create and send an asynchronous SMB2 OPLOCK_BREAK_NOTIFICATION. *********************************************************/ void send_break_message_smb2(files_struct *fsp, int level) { uint8_t smb2_oplock_level = (level == OPLOCKLEVEL_II) ? SMB2_OPLOCK_LEVEL_II : SMB2_OPLOCK_LEVEL_NONE; NTSTATUS status; DEBUG(10,("send_break_message_smb2: sending oplock break " "for file %s, fnum = %d, smb2 level %u\n", fsp_str_dbg(fsp), fsp->fnum, (unsigned int)smb2_oplock_level )); status = smbd_smb2_send_oplock_break(fsp->conn->sconn, (uint64_t)fsp->fnum, (uint64_t)fsp->fnum, smb2_oplock_level); if (!NT_STATUS_IS_OK(status)) { smbd_server_connection_terminate(fsp->conn->sconn, nt_errstr(status)); } }