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ab913d1768
Based on the initial patch from Volker Lendecke <vl@samba.org>. metze
164 lines
4.3 KiB
C
164 lines
4.3 KiB
C
/*
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Unix SMB/CIFS implementation.
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smb2 lib
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Copyright (C) Volker Lendecke 2011
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "client.h"
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#include "async_smb.h"
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#include "smb2cli_base.h"
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#include "smb2cli.h"
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#include "libsmb/proto.h"
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#include "librpc/ndr/libndr.h"
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#include "lib/util/tevent_ntstatus.h"
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struct smb2cli_negprot_state {
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struct cli_state *cli;
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uint8_t fixed[36];
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uint8_t dyn[4];
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};
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static void smb2cli_negprot_done(struct tevent_req *subreq);
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struct tevent_req *smb2cli_negprot_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct cli_state *cli)
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{
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struct tevent_req *req, *subreq;
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struct smb2cli_negprot_state *state;
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uint8_t *buf;
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req = tevent_req_create(mem_ctx, &state,
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struct smb2cli_negprot_state);
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if (req == NULL) {
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return NULL;
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}
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state->cli = cli;
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buf = state->fixed;
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SSVAL(buf, 0, 36);
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SSVAL(buf, 2, 2); /* DialectCount */
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if (client_is_signing_mandatory(cli)) {
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SSVAL(buf, 4, SMB2_NEGOTIATE_SIGNING_REQUIRED);
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} else {
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SSVAL(buf, 4, SMB2_NEGOTIATE_SIGNING_ENABLED);
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}
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SSVAL(buf, 6, 0); /* Reserved */
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SSVAL(buf, 8, 0); /* Capabilities */
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memset(buf+12, 0, 16); /* ClientGuid */
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SBVAL(buf, 28, 0); /* ClientStartTime */
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buf = state->dyn;
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SSVAL(buf, 0, 0x202); /* SMB2.002 */
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SSVAL(buf, 2, 0x210); /* SMB2.1 */
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subreq = smb2cli_req_send(state, ev, cli, SMB2_OP_NEGPROT, 0,
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state->fixed, sizeof(state->fixed),
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state->dyn, sizeof(state->dyn));
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq, smb2cli_negprot_done, req);
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return req;
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}
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static void smb2cli_negprot_done(struct tevent_req *subreq)
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{
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struct tevent_req *req =
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tevent_req_callback_data(subreq,
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struct tevent_req);
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struct smb2cli_negprot_state *state =
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tevent_req_data(req,
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struct smb2cli_negprot_state);
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struct cli_state *cli = state->cli;
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size_t security_offset, security_length;
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DATA_BLOB blob;
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NTSTATUS status;
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struct iovec *iov;
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uint8_t *body;
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status = smb2cli_req_recv(subreq, talloc_tos(), &iov, 65);
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if (!NT_STATUS_IS_OK(status)) {
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TALLOC_FREE(subreq);
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tevent_req_nterror(req, status);
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return;
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}
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body = (uint8_t *)iov[1].iov_base;
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cli->smb2.security_mode = SVAL(body, 2);
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cli->smb2.dialect_revision = SVAL(body, 4);
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blob = data_blob_const(body + 8, 16);
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GUID_from_data_blob(&blob, &cli->smb2.server_guid);
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cli->smb2.server_capabilities = IVAL(body, 24);
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cli->smb2.max_transact_size = IVAL(body, 28);
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cli->smb2.max_read_size = IVAL(body, 32);
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cli->smb2.max_write_size = IVAL(body, 36);
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cli->smb2.system_time = interpret_long_date((char *)body + 40);
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cli->smb2.server_start_time = interpret_long_date((char *)body + 48);
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security_offset = SVAL(body, 56);
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security_length = SVAL(body, 58);
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if ((security_offset != SMB2_HDR_BODY + iov[1].iov_len) ||
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(security_length > iov[2].iov_len)) {
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tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
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return;
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}
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cli->secblob = data_blob(iov[1].iov_base, security_length);
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tevent_req_done(req);
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}
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NTSTATUS smb2cli_negprot_recv(struct tevent_req *req)
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{
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return tevent_req_simple_recv_ntstatus(req);
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}
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NTSTATUS smb2cli_negprot(struct cli_state *cli)
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{
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TALLOC_CTX *frame = talloc_stackframe();
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struct event_context *ev;
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struct tevent_req *req;
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NTSTATUS status = NT_STATUS_NO_MEMORY;
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if (cli_has_async_calls(cli)) {
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/*
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* Can't use sync call while an async call is in flight
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*/
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status = NT_STATUS_INVALID_PARAMETER;
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goto fail;
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}
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ev = event_context_init(frame);
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if (ev == NULL) {
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goto fail;
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}
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req = smb2cli_negprot_send(frame, ev, cli);
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if (req == NULL) {
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goto fail;
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}
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if (!tevent_req_poll_ntstatus(req, ev, &status)) {
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goto fail;
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}
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status = smb2cli_negprot_recv(req);
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fail:
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TALLOC_FREE(frame);
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return status;
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}
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