2 Unix SMB/CIFS implementation.
4 SMB2 client session handling
6 Copyright (C) Andrew Tridgell 2005
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "lib/util/tevent_ntstatus.h"
25 #include "libcli/raw/libcliraw.h"
26 #include "libcli/smb2/smb2.h"
27 #include "libcli/smb2/smb2_calls.h"
28 #include "auth/gensec/gensec.h"
33 initialise a smb2_session structure
35 struct smb2_session *smb2_session_init(struct smb2_transport *transport,
36 struct gensec_settings *settings,
37 TALLOC_CTX *parent_ctx, bool primary)
39 struct smb2_session *session;
42 session = talloc_zero(parent_ctx, struct smb2_session);
47 session->transport = talloc_steal(session, transport);
49 session->transport = talloc_reference(session, transport);
52 session->pid = getpid();
54 /* prepare a gensec context for later use */
55 status = gensec_client_start(session, &session->gensec,
56 session->transport->socket->event.ctx,
58 if (!NT_STATUS_IS_OK(status)) {
63 gensec_want_feature(session->gensec, GENSEC_FEATURE_SESSION_KEY);
69 send a session setup request
71 struct smb2_request *smb2_session_setup_send(struct smb2_session *session,
72 struct smb2_session_setup *io)
74 struct smb2_request *req;
77 req = smb2_request_init(session->transport, SMB2_OP_SESSSETUP,
78 0x18, true, io->in.secblob.length);
79 if (req == NULL) return NULL;
81 SBVAL(req->out.hdr, SMB2_HDR_SESSION_ID, session->uid);
82 SCVAL(req->out.body, 0x02, io->in.vc_number);
83 SCVAL(req->out.body, 0x03, io->in.security_mode);
84 SIVAL(req->out.body, 0x04, io->in.capabilities);
85 SIVAL(req->out.body, 0x08, io->in.channel);
86 SBVAL(req->out.body, 0x10, io->in.previous_sessionid);
88 req->session = session;
90 status = smb2_push_o16s16_blob(&req->out, 0x0C, io->in.secblob);
91 if (!NT_STATUS_IS_OK(status)) {
96 smb2_transport_send(req);
103 recv a session setup reply
105 NTSTATUS smb2_session_setup_recv(struct smb2_request *req, TALLOC_CTX *mem_ctx,
106 struct smb2_session_setup *io)
110 if (!smb2_request_receive(req) ||
111 (smb2_request_is_error(req) &&
112 !NT_STATUS_EQUAL(req->status, NT_STATUS_MORE_PROCESSING_REQUIRED))) {
113 return smb2_request_destroy(req);
116 SMB2_CHECK_PACKET_RECV(req, 0x08, true);
118 io->out.session_flags = SVAL(req->in.body, 0x02);
119 io->out.uid = BVAL(req->in.hdr, SMB2_HDR_SESSION_ID);
121 status = smb2_pull_o16s16_blob(&req->in, mem_ctx, req->in.body+0x04, &io->out.secblob);
122 if (!NT_STATUS_IS_OK(status)) {
123 smb2_request_destroy(req);
127 return smb2_request_destroy(req);
131 sync session setup request
133 NTSTATUS smb2_session_setup(struct smb2_session *session,
134 TALLOC_CTX *mem_ctx, struct smb2_session_setup *io)
136 struct smb2_request *req = smb2_session_setup_send(session, io);
137 return smb2_session_setup_recv(req, mem_ctx, io);
140 struct smb2_session_setup_spnego_state {
141 struct smb2_session_setup io;
142 struct smb2_request *req;
143 NTSTATUS gensec_status;
146 static void smb2_session_setup_spnego_handler(struct smb2_request *req);
149 a composite function that does a full SPNEGO session setup
151 struct tevent_req *smb2_session_setup_spnego_send(TALLOC_CTX *mem_ctx,
152 struct tevent_context *ev,
153 struct smb2_session *session,
154 struct cli_credentials *credentials)
156 struct tevent_req *req;
157 struct smb2_session_setup_spnego_state *state;
158 const char *chosen_oid;
159 struct smb2_request *subreq;
162 req = tevent_req_create(mem_ctx, &state,
163 struct smb2_session_setup_spnego_state);
168 ZERO_STRUCT(state->io);
169 state->io.in.vc_number = 0;
170 if (session->transport->signing_required) {
171 state->io.in.security_mode =
172 SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED;
174 state->io.in.capabilities = 0;
175 state->io.in.channel = 0;
176 state->io.in.previous_sessionid = 0;
178 status = gensec_set_credentials(session->gensec, credentials);
179 if (tevent_req_nterror(req, status)) {
180 return tevent_req_post(req, ev);
183 status = gensec_set_target_hostname(session->gensec,
184 session->transport->socket->hostname);
185 if (tevent_req_nterror(req, status)) {
186 return tevent_req_post(req, ev);
189 status = gensec_set_target_service(session->gensec, "cifs");
190 if (tevent_req_nterror(req, status)) {
191 return tevent_req_post(req, ev);
194 if (session->transport->negotiate.secblob.length > 0) {
195 chosen_oid = GENSEC_OID_SPNEGO;
197 chosen_oid = GENSEC_OID_NTLMSSP;
200 status = gensec_start_mech_by_oid(session->gensec, chosen_oid);
201 if (tevent_req_nterror(req, status)) {
202 return tevent_req_post(req, ev);
205 status = gensec_update(session->gensec, state,
206 session->transport->negotiate.secblob,
207 &state->io.in.secblob);
208 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
209 tevent_req_nterror(req, status);
210 return tevent_req_post(req, ev);
212 state->gensec_status = status;
214 subreq = smb2_session_setup_send(session, &state->io);
215 if (tevent_req_nomem(subreq, req)) {
216 return tevent_req_post(req, ev);
218 subreq->async.fn = smb2_session_setup_spnego_handler;
219 subreq->async.private_data = req;
225 handle continuations of the spnego session setup
227 static void smb2_session_setup_spnego_handler(struct smb2_request *subreq)
229 struct tevent_req *req =
230 talloc_get_type_abort(subreq->async.private_data,
232 struct smb2_session_setup_spnego_state *state =
234 struct smb2_session_setup_spnego_state);
235 struct smb2_session *session = subreq->session;
236 NTSTATUS peer_status;
239 status = smb2_session_setup_recv(subreq, state, &state->io);
240 peer_status = status;
241 if (NT_STATUS_EQUAL(peer_status, NT_STATUS_MORE_PROCESSING_REQUIRED) ||
242 (NT_STATUS_IS_OK(peer_status) &&
243 NT_STATUS_EQUAL(state->gensec_status, NT_STATUS_MORE_PROCESSING_REQUIRED))) {
244 status = gensec_update(session->gensec, state,
245 state->io.out.secblob,
246 &state->io.in.secblob);
247 state->gensec_status = status;
248 session->uid = state->io.out.uid;
251 if (!NT_STATUS_IS_OK(status) &&
252 !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
253 tevent_req_nterror(req, status);
257 if (NT_STATUS_EQUAL(peer_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
258 subreq = smb2_session_setup_send(session, &state->io);
259 if (tevent_req_nomem(subreq, req)) {
263 subreq->async.fn = smb2_session_setup_spnego_handler;
264 subreq->async.private_data = req;
268 gensec_session_key(session->gensec, session, &session->session_key);
270 if (session->transport->signing_required) {
271 if (session->session_key.length == 0) {
272 DEBUG(0,("Wrong session key length %u for SMB2 signing\n",
273 (unsigned)session->session_key.length));
274 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
277 session->signing_active = true;
280 tevent_req_done(req);
284 receive a composite session setup reply
286 NTSTATUS smb2_session_setup_spnego_recv(struct tevent_req *req)
288 return tevent_req_simple_recv_ntstatus(req);
292 sync version of smb2_session_setup_spnego
294 NTSTATUS smb2_session_setup_spnego(struct smb2_session *session,
295 struct cli_credentials *credentials)
297 struct tevent_req *subreq;
300 TALLOC_CTX *frame = talloc_stackframe();
301 struct tevent_context *ev = session->transport->socket->event.ctx;
304 return NT_STATUS_NO_MEMORY;
307 subreq = smb2_session_setup_spnego_send(frame, ev,
308 session, credentials);
309 if (subreq == NULL) {
311 return NT_STATUS_NO_MEMORY;
314 ok = tevent_req_poll(subreq, ev);
316 status = map_nt_error_from_unix_common(errno);
321 status = smb2_session_setup_spnego_recv(subreq);
323 if (!NT_STATUS_IS_OK(status)) {