diff options
Diffstat (limited to 'source3/smbd/smb2_break.c')
| -rw-r--r-- | source3/smbd/smb2_break.c | 495 |
1 files changed, 495 insertions, 0 deletions
diff --git a/source3/smbd/smb2_break.c b/source3/smbd/smb2_break.c new file mode 100644 index 0000000..e8f6b99 --- /dev/null +++ b/source3/smbd/smb2_break.c @@ -0,0 +1,495 @@ +/* + 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" +#include "locking/leases_db.h" + +#undef DBGC_CLASS +#define DBGC_CLASS DBGC_SMB2 + +static NTSTATUS smbd_smb2_request_process_lease_break( + struct smbd_smb2_request *req); + +static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct smbd_smb2_request *smb2req, + struct files_struct *in_fsp, + uint8_t in_oplock_level); +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; + uint8_t in_oplock_level; + uint64_t in_file_id_persistent; + uint64_t in_file_id_volatile; + struct files_struct *in_fsp; + struct tevent_req *subreq; + + status = smbd_smb2_request_verify_sizes(req, 0x18); + if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) { + /* + * Retry as a lease break + */ + return smbd_smb2_request_process_lease_break(req); + } + if (!NT_STATUS_IS_OK(status)) { + return smbd_smb2_request_error(req, status); + } + inbody = SMBD_SMB2_IN_BODY_PTR(req); + + in_oplock_level = CVAL(inbody, 0x02); + + /* 0x03 1 bytes reserved */ + /* 0x04 4 bytes reserved */ + in_file_id_persistent = BVAL(inbody, 0x08); + in_file_id_volatile = BVAL(inbody, 0x10); + + in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile); + if (in_fsp == NULL) { + return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED); + } + + /* Are we awaiting a break message ? */ + if (in_fsp->oplock_timeout == NULL) { + return smbd_smb2_request_error( + req, NT_STATUS_INVALID_OPLOCK_PROTOCOL); + } + + 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); + } + + subreq = smbd_smb2_oplock_break_send(req, req->sconn->ev_ctx, + req, in_fsp, in_oplock_level); + 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, 500); +} + +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; + 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->xconn, + nt_errstr(error)); + return; + } + return; + } + + inbody = SMBD_SMB2_IN_BODY_PTR(req); + + in_file_id_persistent = BVAL(inbody, 0x08); + in_file_id_volatile = BVAL(inbody, 0x10); + + outbody = smbd_smb2_generate_outbody(req, 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->xconn, + 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->xconn, + 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, + struct files_struct *fsp, + uint8_t in_oplock_level) +{ + struct tevent_req *req; + struct smbd_smb2_oplock_break_state *state; + struct smb_request *smbreq; + 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: %s - %s, " + "samba level %d\n", + fsp_str_dbg(fsp), fsp_fnum_dbg(fsp), + oplocklevel)); + + smbreq = smbd_smb2_fake_smb_request(smb2req); + if (tevent_req_nomem(smbreq, req)) { + return tevent_req_post(req, ev); + } + + DEBUG(5,("smbd_smb2_oplock_break_send: got SMB2 oplock break (%u) from client " + "for file %s, %s\n", + (unsigned int)in_oplock_level, + fsp_str_dbg(fsp), + fsp_fnum_dbg(fsp))); + + 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"); + } + + 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; +} + +static void smbd_smb2_request_lease_break_done(struct tevent_req *subreq); + +static struct tevent_req *smbd_smb2_lease_break_send( + TALLOC_CTX *mem_ctx, struct tevent_context *ev, + struct smbd_smb2_request *smb2_req, struct smb2_lease_key in_lease_key, + uint32_t in_lease_state); +static NTSTATUS smbd_smb2_lease_break_recv(struct tevent_req *req, + uint32_t *out_lease_state); + + +static NTSTATUS smbd_smb2_request_process_lease_break( + struct smbd_smb2_request *req) +{ + NTSTATUS status; + const uint8_t *inbody; + struct smb2_lease_key in_lease_key; + uint32_t in_lease_state; + struct tevent_req *subreq; + + status = smbd_smb2_request_verify_sizes(req, 0x24); + if (!NT_STATUS_IS_OK(status)) { + return smbd_smb2_request_error(req, status); + } + + inbody = SMBD_SMB2_IN_BODY_PTR(req); + + in_lease_key.data[0] = BVAL(inbody, 8); + in_lease_key.data[1] = BVAL(inbody, 16); + in_lease_state = IVAL(inbody, 24); + + subreq = smbd_smb2_lease_break_send(req, req->sconn->ev_ctx, req, + in_lease_key, in_lease_state); + if (subreq == NULL) { + return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY); + } + tevent_req_set_callback(subreq, smbd_smb2_request_lease_break_done, req); + + return smbd_smb2_request_pending_queue(req, subreq, 500); +} + +static void smbd_smb2_request_lease_break_done(struct tevent_req *subreq) +{ + struct smbd_smb2_request *req = tevent_req_callback_data( + subreq, struct smbd_smb2_request); + const uint8_t *inbody; + struct smb2_lease_key in_lease_key; + uint32_t out_lease_state = 0; + DATA_BLOB outbody; + NTSTATUS status; + NTSTATUS error; /* transport error */ + + status = smbd_smb2_lease_break_recv(subreq, &out_lease_state); + 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->xconn, + nt_errstr(error)); + return; + } + return; + } + + inbody = SMBD_SMB2_IN_BODY_PTR(req); + + in_lease_key.data[0] = BVAL(inbody, 8); + in_lease_key.data[1] = BVAL(inbody, 16); + + outbody = smbd_smb2_generate_outbody(req, 0x24); + 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->xconn, + nt_errstr(error)); + return; + } + return; + } + + SSVAL(outbody.data, 0x00, 0x24); /* struct size */ + SSVAL(outbody.data, 0x02, 0); /* reserved */ + SIVAL(outbody.data, 0x04, 0); /* flags, must be 0 */ + SBVAL(outbody.data, 0x08, in_lease_key.data[0]); + SBVAL(outbody.data, 0x10, in_lease_key.data[1]); + SIVAL(outbody.data, 0x18, out_lease_state); + SBVAL(outbody.data, 0x1c, 0); /* leaseduration, must be 0 */ + + error = smbd_smb2_request_done(req, outbody, NULL); + if (!NT_STATUS_IS_OK(error)) { + smbd_server_connection_terminate(req->xconn, + nt_errstr(error)); + return; + } +} + +struct smbd_smb2_lease_break_state { + uint32_t lease_state; +}; + +struct lease_lookup_state { + TALLOC_CTX *mem_ctx; + /* Return parameters. */ + uint32_t num_file_ids; + struct file_id *ids; + NTSTATUS status; +}; + +static void lease_parser( + uint32_t num_files, + const struct leases_db_file *files, + void *private_data) +{ + struct lease_lookup_state *lls = + (struct lease_lookup_state *)private_data; + + lls->status = NT_STATUS_OK; + lls->num_file_ids = num_files; + lls->status = leases_db_copy_file_ids(lls->mem_ctx, + num_files, + files, + &lls->ids); +} + +static struct tevent_req *smbd_smb2_lease_break_send( + TALLOC_CTX *mem_ctx, struct tevent_context *ev, + struct smbd_smb2_request *smb2_req, struct smb2_lease_key in_lease_key, + uint32_t in_lease_state) +{ + struct tevent_req *req; + struct smbd_smb2_lease_break_state *state; + struct lease_lookup_state lls = {.mem_ctx = mem_ctx}; + NTSTATUS status; + + req = tevent_req_create(mem_ctx, &state, + struct smbd_smb2_lease_break_state); + if (req == NULL) { + return NULL; + } + state->lease_state = in_lease_state; + + /* Find any file ids with this lease key. */ + status = leases_db_parse(&smb2_req->xconn->smb2.client.guid, + &in_lease_key, + lease_parser, + &lls); + + if (!NT_STATUS_IS_OK(status)) { + if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) { + status = NT_STATUS_OBJECT_NAME_NOT_FOUND; + DEBUG(10, ("No record for lease key found\n")); + } + tevent_req_nterror(req, status); + return tevent_req_post(req, ev); + } + + if (tevent_req_nterror(req, lls.status)) { + return tevent_req_post(req, ev); + } + + if (lls.num_file_ids == 0) { + tevent_req_nterror(req, NT_STATUS_OBJECT_NAME_NOT_FOUND); + return tevent_req_post(req, ev); + } + + status = downgrade_lease(smb2_req->xconn->client, + lls.num_file_ids, + lls.ids, + &in_lease_key, + in_lease_state); + + if (NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_BREAK_IN_PROGRESS)) { + tevent_req_done(req); + return tevent_req_post(req, ev); + } + if (tevent_req_nterror(req, status)) { + DEBUG(10, ("downgrade_lease returned %s\n", + nt_errstr(status))); + return tevent_req_post(req, ev); + } + + tevent_req_done(req); + return tevent_req_post(req, ev); +} + +static NTSTATUS smbd_smb2_lease_break_recv(struct tevent_req *req, + uint32_t *out_lease_state) +{ + struct smbd_smb2_lease_break_state *state = tevent_req_data( + req, struct smbd_smb2_lease_break_state); + NTSTATUS status; + + if (tevent_req_is_nterror(req, &status)) { + return status; + } + *out_lease_state = state->lease_state; + return NT_STATUS_OK; +} + +/********************************************************* + Create and send an asynchronous + SMB2 OPLOCK_BREAK_NOTIFICATION. +*********************************************************/ + +void send_break_message_smb2(files_struct *fsp, + uint32_t break_from, + uint32_t break_to) +{ + struct smbXsrv_client *client = + fsp->conn->sconn->client; + NTSTATUS status; + + if (!NT_STATUS_IS_OK(fsp->op->status)) { + DBG_DEBUG("skip oplock break for file %s, %s, " + "smb2 level %u fsp status=%s\n", + fsp_str_dbg(fsp), + fsp_fnum_dbg(fsp), + (unsigned int)break_to, + nt_errstr(fsp->op->status)); + return; + } + + DBG_DEBUG("sending oplock break " + "for file %s, %s, smb2 level %u\n", + fsp_str_dbg(fsp), + fsp_fnum_dbg(fsp), + (unsigned int)break_to); + + if (fsp->oplock_type == LEASE_OPLOCK) { + uint32_t break_flags = 0; + uint16_t new_epoch; + + if (fsp->lease->lease.lease_state != SMB2_LEASE_NONE) { + break_flags = SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED; + } + + if (fsp->lease->lease.lease_version > 1) { + new_epoch = fsp->lease->lease.lease_epoch; + } else { + new_epoch = 0; + } + + status = smbd_smb2_send_lease_break(client, new_epoch, break_flags, + &fsp->lease->lease.lease_key, + break_from, break_to); + } else { + uint8_t smb2_oplock_level; + smb2_oplock_level = (break_to & SMB2_LEASE_READ) ? + SMB2_OPLOCK_LEVEL_II : SMB2_OPLOCK_LEVEL_NONE; + status = smbd_smb2_send_oplock_break(client, + fsp->op, + smb2_oplock_level); + } + if (!NT_STATUS_IS_OK(status)) { + smbd_server_disconnect_client(client, + nt_errstr(status)); + return; + } +} |