diff options
Diffstat (limited to 'source4/libcli/smb2/transport.c')
| -rw-r--r-- | source4/libcli/smb2/transport.c | 557 |
1 files changed, 557 insertions, 0 deletions
diff --git a/source4/libcli/smb2/transport.c b/source4/libcli/smb2/transport.c new file mode 100644 index 0000000..292ca0f --- /dev/null +++ b/source4/libcli/smb2/transport.c @@ -0,0 +1,557 @@ +/* + Unix SMB/CIFS implementation. + + SMB2 client transport context management functions + + Copyright (C) Andrew Tridgell 2005 + + 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 "system/network.h" +#include "libcli/raw/libcliraw.h" +#include "libcli/raw/raw_proto.h" +#include "libcli/smb2/smb2.h" +#include "libcli/smb2/smb2_calls.h" +#include "lib/socket/socket.h" +#include "lib/events/events.h" +#include "../lib/util/dlinklist.h" +#include "../libcli/smb/smbXcli_base.h" +#include "librpc/ndr/libndr.h" + +/* + destroy a transport + */ +static int transport_destructor(struct smb2_transport *transport) +{ + smb2_transport_dead(transport, NT_STATUS_LOCAL_DISCONNECT); + return 0; +} + +/* + create a transport structure based on an established socket +*/ +struct smb2_transport *smb2_transport_init(struct smbcli_socket *sock, + TALLOC_CTX *parent_ctx, + struct smbcli_options *options) +{ + struct smb2_transport *transport; + + transport = talloc_zero(parent_ctx, struct smb2_transport); + if (!transport) return NULL; + + transport->ev = sock->event.ctx; + transport->options = *options; + + if (transport->options.max_protocol == PROTOCOL_DEFAULT) { + transport->options.max_protocol = PROTOCOL_LATEST; + } + + if (transport->options.max_protocol < PROTOCOL_SMB2_02) { + transport->options.max_protocol = PROTOCOL_LATEST; + } + + TALLOC_FREE(sock->event.fde); + TALLOC_FREE(sock->event.te); + + transport->conn = smbXcli_conn_create(transport, + sock->sock->fd, + sock->hostname, + options->signing, + 0, /* smb1_capabilities */ + &options->client_guid, + options->smb2_capabilities, + &options->smb3_capabilities); + if (transport->conn == NULL) { + talloc_free(transport); + return NULL; + } + sock->sock->fd = -1; + TALLOC_FREE(sock); + + talloc_set_destructor(transport, transport_destructor); + + return transport; +} + +/* + create a transport structure based on an established socket +*/ +NTSTATUS smb2_transport_raw_init(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct smbXcli_conn **_conn, + const struct smbcli_options *options, + struct smb2_transport **_transport) +{ + struct smb2_transport *transport = NULL; + enum protocol_types protocol; + + if (*_conn == NULL) { + return NT_STATUS_INVALID_PARAMETER; + } + + protocol = smbXcli_conn_protocol(*_conn); + if (protocol < PROTOCOL_SMB2_02) { + return NT_STATUS_REVISION_MISMATCH; + } + + transport = talloc_zero(mem_ctx, struct smb2_transport); + if (transport == NULL) { + return NT_STATUS_NO_MEMORY; + } + + transport->ev = ev; + transport->options = *options; + transport->conn = talloc_move(transport, _conn); + + talloc_set_destructor(transport, transport_destructor); + *_transport = transport; + return NT_STATUS_OK; +} + +/* + mark the transport as dead +*/ +void smb2_transport_dead(struct smb2_transport *transport, NTSTATUS status) +{ + if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) { + status = NT_STATUS_UNEXPECTED_NETWORK_ERROR; + } + if (NT_STATUS_IS_OK(status)) { + status = NT_STATUS_LOCAL_DISCONNECT; + } + + smbXcli_conn_disconnect(transport->conn, status); +} + +static void smb2_request_done(struct tevent_req *subreq); +static void smb2_transport_break_handler(struct tevent_req *subreq); + +/* + put a request into the send queue +*/ +void smb2_transport_send(struct smb2_request *req) +{ + NTSTATUS status; + struct smb2_transport *transport = req->transport; + struct tevent_req **reqs = transport->compound.reqs; + size_t num_reqs = talloc_array_length(reqs); + size_t i; + uint16_t cmd = SVAL(req->out.hdr, SMB2_HDR_OPCODE); + uint32_t additional_flags = IVAL(req->out.hdr, SMB2_HDR_FLAGS); + uint32_t clear_flags = 0; + struct smbXcli_tcon *tcon = NULL; + struct smbXcli_session *session = NULL; + bool need_pending_break = false; + size_t hdr_ofs; + size_t pdu_len; + DATA_BLOB body = data_blob_null; + DATA_BLOB dyn = data_blob_null; + uint32_t timeout_msec = transport->options.request_timeout * 1000; + + if (transport->oplock.handler) { + need_pending_break = true; + } + + if (transport->lease.handler) { + need_pending_break = true; + } + + if (transport->break_subreq) { + need_pending_break = false; + } + + if (need_pending_break) { + struct tevent_req *subreq; + + subreq = smb2cli_req_create(transport, + transport->ev, + transport->conn, + SMB2_OP_BREAK, + 0, /* additional_flags */ + 0, /*clear_flags */ + 0, /* timeout_msec */ + NULL, /* tcon */ + NULL, /* session */ + NULL, /* body */ + 0, /* body_fixed */ + NULL, /* dyn */ + 0, /* dyn_len */ + 0); /* max_dyn_len */ + if (subreq != NULL) { + smbXcli_req_set_pending(subreq); + tevent_req_set_callback(subreq, + smb2_transport_break_handler, + transport); + transport->break_subreq = subreq; + } + } + + if (req->session) { + session = req->session->smbXcli; + } + + if (req->tree) { + tcon = req->tree->smbXcli; + } + + if (transport->compound.related) { + additional_flags |= SMB2_HDR_FLAG_CHAINED; + } + + hdr_ofs = PTR_DIFF(req->out.hdr, req->out.buffer); + pdu_len = req->out.size - hdr_ofs; + body.data = req->out.body; + body.length = req->out.body_fixed; + dyn.data = req->out.body + req->out.body_fixed; + dyn.length = pdu_len - (SMB2_HDR_BODY + req->out.body_fixed); + + req->subreq = smb2cli_req_create(req, + transport->ev, + transport->conn, + cmd, + additional_flags, + clear_flags, + timeout_msec, + tcon, + session, + body.data, body.length, + dyn.data, dyn.length, + 0); /* max_dyn_len */ + if (req->subreq == NULL) { + req->state = SMB2_REQUEST_ERROR; + req->status = NT_STATUS_NO_MEMORY; + return; + } + + if (!tevent_req_is_in_progress(req->subreq)) { + req->state = SMB2_REQUEST_ERROR; + req->status = NT_STATUS_INTERNAL_ERROR;/* TODO */ + return; + } + + tevent_req_set_callback(req->subreq, smb2_request_done, req); + + smb2cli_req_set_notify_async(req->subreq); + if (req->credit_charge) { + smb2cli_req_set_credit_charge(req->subreq, req->credit_charge); + } + + ZERO_STRUCT(req->out); + req->state = SMB2_REQUEST_RECV; + + if (num_reqs > 0) { + for (i=0; i < num_reqs; i++) { + if (reqs[i] != NULL) { + continue; + } + + reqs[i] = req->subreq; + i++; + break; + } + + if (i < num_reqs) { + return; + } + } else { + reqs = &req->subreq; + num_reqs = 1; + } + status = smb2cli_req_compound_submit(reqs, num_reqs); + + TALLOC_FREE(transport->compound.reqs); + transport->compound.related = false; + + if (!NT_STATUS_IS_OK(status)) { + req->status = status; + req->state = SMB2_REQUEST_ERROR; + smbXcli_conn_disconnect(transport->conn, status); + } +} + +static void smb2_request_done(struct tevent_req *subreq) +{ + struct smb2_request *req = + tevent_req_callback_data(subreq, + struct smb2_request); + ssize_t len; + size_t i; + + req->recv_iov = NULL; + + req->status = smb2cli_req_recv(req->subreq, req, &req->recv_iov, NULL, 0); + if (NT_STATUS_EQUAL(req->status, NT_STATUS_PENDING)) { + struct timeval endtime = smbXcli_req_endtime(subreq); + bool ok; + + req->cancel.can_cancel = true; + if (timeval_is_zero(&endtime)) { + return; + } + + ok = tevent_req_set_endtime( + subreq, req->transport->ev, endtime); + if (!ok) { + req->status = NT_STATUS_INTERNAL_ERROR; + req->state = SMB2_REQUEST_ERROR; + if (req->async.fn) { + req->async.fn(req); + } + return; + } + return; + } + TALLOC_FREE(req->subreq); + if (!NT_STATUS_IS_OK(req->status)) { + if (req->recv_iov == NULL) { + req->state = SMB2_REQUEST_ERROR; + if (req->async.fn) { + req->async.fn(req); + } + return; + } + } + + len = req->recv_iov[0].iov_len; + for (i=1; i < 3; i++) { + uint8_t *p = req->recv_iov[i-1].iov_base; + uint8_t *c1 = req->recv_iov[i].iov_base; + uint8_t *c2 = p + req->recv_iov[i-1].iov_len; + + len += req->recv_iov[i].iov_len; + + if (req->recv_iov[i].iov_len == 0) { + continue; + } + + if (c1 != c2) { + req->status = NT_STATUS_INTERNAL_ERROR; + req->state = SMB2_REQUEST_ERROR; + if (req->async.fn) { + req->async.fn(req); + } + return; + } + } + + req->in.buffer = req->recv_iov[0].iov_base; + req->in.size = len; + req->in.allocated = req->in.size; + + req->in.hdr = req->recv_iov[0].iov_base; + req->in.body = req->recv_iov[1].iov_base; + req->in.dynamic = req->recv_iov[2].iov_base; + req->in.body_fixed = req->recv_iov[1].iov_len; + req->in.body_size = req->in.body_fixed; + req->in.body_size += req->recv_iov[2].iov_len; + + smb2_setup_bufinfo(req); + + req->state = SMB2_REQUEST_DONE; + if (req->async.fn) { + req->async.fn(req); + } +} + +static void smb2_transport_break_handler(struct tevent_req *subreq) +{ + struct smb2_transport *transport = + tevent_req_callback_data(subreq, + struct smb2_transport); + NTSTATUS status; + uint8_t *body; + uint16_t len = 0; + bool lease; + struct iovec *recv_iov = NULL; + + transport->break_subreq = NULL; + + status = smb2cli_req_recv(subreq, transport, &recv_iov, NULL, 0); + TALLOC_FREE(subreq); + if (!NT_STATUS_IS_OK(status)) { + TALLOC_FREE(recv_iov); + smb2_transport_dead(transport, status); + return; + } + + /* + * Setup the subreq to handle the + * next incoming SMB2 Break. + */ + subreq = smb2cli_req_create(transport, + transport->ev, + transport->conn, + SMB2_OP_BREAK, + 0, /* additional_flags */ + 0, /*clear_flags */ + 0, /* timeout_msec */ + NULL, /* tcon */ + NULL, /* session */ + NULL, /* body */ + 0, /* body_fixed */ + NULL, /* dyn */ + 0, /* dyn_len */ + 0); /* max_dyn_len */ + if (subreq != NULL) { + smbXcli_req_set_pending(subreq); + tevent_req_set_callback(subreq, + smb2_transport_break_handler, + transport); + transport->break_subreq = subreq; + } + + body = recv_iov[1].iov_base; + + len = recv_iov[1].iov_len; + if (recv_iov[1].iov_len >= 2) { + len = CVAL(body, 0x00); + if (len != recv_iov[1].iov_len) { + len = recv_iov[1].iov_len; + } + } + + if (len == 24) { + lease = false; + } else if (len == 44) { + lease = true; + } else { + DEBUG(1,("Discarding smb2 oplock reply of invalid size %u\n", + (unsigned)len)); + TALLOC_FREE(recv_iov); + status = NT_STATUS_INVALID_NETWORK_RESPONSE; + smb2_transport_dead(transport, status); + return; + } + + if (!lease && transport->oplock.handler) { + struct smb2_handle h; + uint8_t level; + + level = CVAL(body, 0x02); + smb2_pull_handle(body+0x08, &h); + + TALLOC_FREE(recv_iov); + + transport->oplock.handler(transport, &h, level, + transport->oplock.private_data); + } else if (lease && transport->lease.handler) { + struct smb2_lease_break lb; + + ZERO_STRUCT(lb); + lb.new_epoch = SVAL(body, 0x2); + lb.break_flags = SVAL(body, 0x4); + memcpy(&lb.current_lease.lease_key, body+0x8, + sizeof(struct smb2_lease_key)); + lb.current_lease.lease_state = SVAL(body, 0x18); + lb.new_lease_state = SVAL(body, 0x1C); + lb.break_reason = SVAL(body, 0x20); + lb.access_mask_hint = SVAL(body, 0x24); + lb.share_mask_hint = SVAL(body, 0x28); + + TALLOC_FREE(recv_iov); + + transport->lease.handler(transport, &lb, + transport->lease.private_data); + } else { + DEBUG(5,("Got SMB2 %s break with no handler\n", + lease ? "lease" : "oplock")); + } + TALLOC_FREE(recv_iov); +} + +NTSTATUS smb2_transport_compound_start(struct smb2_transport *transport, + uint32_t num) +{ + TALLOC_FREE(transport->compound.reqs); + ZERO_STRUCT(transport->compound); + + transport->compound.reqs = talloc_zero_array(transport, + struct tevent_req *, + num); + if (transport->compound.reqs == NULL) { + return NT_STATUS_NO_MEMORY; + } + + return NT_STATUS_OK; +} + +void smb2_transport_compound_set_related(struct smb2_transport *transport, + bool related) +{ + transport->compound.related = related; +} + +void smb2_transport_credits_ask_num(struct smb2_transport *transport, + uint16_t ask_num) +{ + smb2cli_conn_set_max_credits(transport->conn, ask_num); +} + +static void idle_handler(struct tevent_context *ev, + struct tevent_timer *te, struct timeval t, void *private_data) +{ + struct smb2_transport *transport = talloc_get_type(private_data, + struct smb2_transport); + struct timeval next; + + transport->idle.func(transport, transport->idle.private_data); + + if (transport->idle.func == NULL) { + return; + } + + if (!smbXcli_conn_is_connected(transport->conn)) { + return; + } + + next = timeval_current_ofs_usec(transport->idle.period); + transport->idle.te = tevent_add_timer(transport->ev, + transport, + next, + idle_handler, + transport); +} + +/* + setup the idle handler for a transport + the period is in microseconds +*/ +void smb2_transport_idle_handler(struct smb2_transport *transport, + void (*idle_func)(struct smb2_transport *, void *), + uint64_t period, + void *private_data) +{ + TALLOC_FREE(transport->idle.te); + ZERO_STRUCT(transport->idle); + + if (idle_func == NULL) { + return; + } + + if (!smbXcli_conn_is_connected(transport->conn)) { + return; + } + + transport->idle.func = idle_func; + transport->idle.private_data = private_data; + transport->idle.period = period; + + transport->idle.te = tevent_add_timer(transport->ev, + transport, + timeval_current_ofs_usec(period), + idle_handler, + transport); +} |