/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- sesssetup_common_strings
- smbsrv_sesssetup_backend_send
- sesssetup_old_send
- sesssetup_old
- sesssetup_nt1_send
- sesssetup_nt1
- sesssetup_spnego_send
- sesssetup_spnego
- smbsrv_sesssetup_backend
1
2 /*
3 Unix SMB/CIFS implementation.
4 handle SMBsessionsetup
5 Copyright (C) Andrew Tridgell 1998-2001
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
7 Copyright (C) Jim McDonough 2002
8 Copyright (C) Luke Howard 2003
9 Copyright (C) Stefan Metzmacher 2005
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
15
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
20
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 */
24
25 #include "includes.h"
26 #include "version.h"
27 #include "auth/credentials/credentials.h"
28 #include "auth/gensec/gensec.h"
29 #include "auth/auth.h"
30 #include "smb_server/smb_server.h"
31 #include "smbd/service_stream.h"
32 #include "librpc/gen_ndr/nbt.h"
33 #include "param/param.h"
34
35 /*
36 setup the OS, Lanman and domain portions of a session setup reply
37 */
38 static void sesssetup_common_strings(struct smbsrv_request *req,
/* [<][>][^][v][top][bottom][index][help] */
39 char **os, char **lanman, char **domain)
40 {
41 (*os) = talloc_asprintf(req, "Unix");
42 (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
43 (*domain) = talloc_asprintf(req, "%s",
44 lp_workgroup(req->smb_conn->lp_ctx));
45 }
46
47 static void smbsrv_sesssetup_backend_send(struct smbsrv_request *req,
/* [<][>][^][v][top][bottom][index][help] */
48 union smb_sesssetup *sess,
49 NTSTATUS status)
50 {
51 if (NT_STATUS_IS_OK(status)) {
52 req->smb_conn->negotiate.done_sesssetup = true;
53 /* we need to keep the session long term */
54 req->session = talloc_steal(req->smb_conn, req->session);
55 }
56 smbsrv_reply_sesssetup_send(req, sess, status);
57 }
58
59 static void sesssetup_old_send(struct auth_check_password_request *areq,
/* [<][>][^][v][top][bottom][index][help] */
60 void *private_data)
61 {
62 struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
63 union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
64 struct auth_serversupplied_info *server_info = NULL;
65 struct auth_session_info *session_info;
66 struct smbsrv_session *smb_sess;
67 NTSTATUS status;
68
69 status = auth_check_password_recv(areq, req, &server_info);
70 if (!NT_STATUS_IS_OK(status)) goto failed;
71
72 /* This references server_info into session_info */
73 status = auth_generate_session_info(req, req->smb_conn->connection->event.ctx, req->smb_conn->lp_ctx,
74 server_info, &session_info);
75 if (!NT_STATUS_IS_OK(status)) goto failed;
76
77 /* allocate a new session */
78 smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
79 if (!smb_sess) {
80 status = NT_STATUS_INSUFFICIENT_RESOURCES;
81 goto failed;
82 }
83
84 /* Ensure this is marked as a 'real' vuid, not one
85 * simply valid for the session setup leg */
86 status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
87 if (!NT_STATUS_IS_OK(status)) goto failed;
88
89 /* To correctly process any AndX packet (like a tree connect)
90 * we need to fill in the session on the request here */
91 req->session = smb_sess;
92 sess->old.out.vuid = smb_sess->vuid;
93
94 failed:
95 status = auth_nt_status_squash(status);
96 smbsrv_sesssetup_backend_send(req, sess, status);
97 }
98
99 /*
100 handler for old style session setup
101 */
102 static void sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
/* [<][>][^][v][top][bottom][index][help] */
103 {
104 struct auth_usersupplied_info *user_info = NULL;
105 struct socket_address *remote_address;
106 const char *remote_machine = NULL;
107
108 sess->old.out.vuid = 0;
109 sess->old.out.action = 0;
110
111 sesssetup_common_strings(req,
112 &sess->old.out.os,
113 &sess->old.out.lanman,
114 &sess->old.out.domain);
115
116 if (!req->smb_conn->negotiate.done_sesssetup) {
117 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
118 }
119
120 if (req->smb_conn->negotiate.calling_name) {
121 remote_machine = req->smb_conn->negotiate.calling_name->name;
122 }
123
124 remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
125 if (!remote_address) goto nomem;
126
127 if (!remote_machine) {
128 remote_machine = remote_address->addr;
129 }
130
131 user_info = talloc(req, struct auth_usersupplied_info);
132 if (!user_info) goto nomem;
133
134 user_info->mapped_state = false;
135 user_info->logon_parameters = 0;
136 user_info->flags = 0;
137 user_info->client.account_name = sess->old.in.user;
138 user_info->client.domain_name = sess->old.in.domain;
139 user_info->workstation_name = remote_machine;
140 user_info->remote_host = talloc_steal(user_info, remote_address);
141
142 user_info->password_state = AUTH_PASSWORD_RESPONSE;
143 user_info->password.response.lanman = sess->old.in.password;
144 user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
145 user_info->password.response.nt = data_blob(NULL, 0);
146
147 auth_check_password_send(req->smb_conn->negotiate.auth_context, user_info,
148 sesssetup_old_send, req);
149 return;
150
151 nomem:
152 smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_NO_MEMORY);
153 }
154
155 static void sesssetup_nt1_send(struct auth_check_password_request *areq,
/* [<][>][^][v][top][bottom][index][help] */
156 void *private_data)
157 {
158 struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
159 union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
160 struct auth_serversupplied_info *server_info = NULL;
161 struct auth_session_info *session_info;
162 struct smbsrv_session *smb_sess;
163 NTSTATUS status;
164
165 status = auth_check_password_recv(areq, req, &server_info);
166 if (!NT_STATUS_IS_OK(status)) goto failed;
167
168 /* This references server_info into session_info */
169 status = auth_generate_session_info(req, req->smb_conn->connection->event.ctx,
170 req->smb_conn->lp_ctx,
171 server_info, &session_info);
172 if (!NT_STATUS_IS_OK(status)) goto failed;
173
174 /* allocate a new session */
175 smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
176 if (!smb_sess) {
177 status = NT_STATUS_INSUFFICIENT_RESOURCES;
178 goto failed;
179 }
180
181 /* Ensure this is marked as a 'real' vuid, not one
182 * simply valid for the session setup leg */
183 status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
184 if (!NT_STATUS_IS_OK(status)) goto failed;
185
186 /* To correctly process any AndX packet (like a tree connect)
187 * we need to fill in the session on the request here */
188 req->session = smb_sess;
189 sess->nt1.out.vuid = smb_sess->vuid;
190
191 if (!smbsrv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
192 /* Already signing, or disabled */
193 goto done;
194 }
195
196 done:
197 status = NT_STATUS_OK;
198 failed:
199 status = auth_nt_status_squash(status);
200 smbsrv_sesssetup_backend_send(req, sess, status);
201 }
202
203 /*
204 handler for NT1 style session setup
205 */
206 static void sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
/* [<][>][^][v][top][bottom][index][help] */
207 {
208 NTSTATUS status;
209 struct auth_context *auth_context;
210 struct auth_usersupplied_info *user_info = NULL;
211 struct socket_address *remote_address;
212 const char *remote_machine = NULL;
213
214 sess->nt1.out.vuid = 0;
215 sess->nt1.out.action = 0;
216
217 sesssetup_common_strings(req,
218 &sess->nt1.out.os,
219 &sess->nt1.out.lanman,
220 &sess->nt1.out.domain);
221
222 if (!req->smb_conn->negotiate.done_sesssetup) {
223 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
224 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
225 }
226
227 if (req->smb_conn->negotiate.oid) {
228 if (sess->nt1.in.user && *sess->nt1.in.user) {
229 /* We can't accept a normal login, because we
230 * don't have a challenge */
231 status = NT_STATUS_LOGON_FAILURE;
232 goto failed;
233 }
234
235 /* TODO: should we use just "anonymous" here? */
236 status = auth_context_create(req,
237 req->smb_conn->connection->event.ctx,
238 req->smb_conn->connection->msg_ctx,
239 req->smb_conn->lp_ctx,
240 &auth_context);
241 if (!NT_STATUS_IS_OK(status)) goto failed;
242 } else {
243 auth_context = req->smb_conn->negotiate.auth_context;
244 }
245
246 if (req->smb_conn->negotiate.calling_name) {
247 remote_machine = req->smb_conn->negotiate.calling_name->name;
248 }
249
250 remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
251 if (!remote_address) goto nomem;
252
253 if (!remote_machine) {
254 remote_machine = remote_address->addr;
255 }
256
257 user_info = talloc(req, struct auth_usersupplied_info);
258 if (!user_info) goto nomem;
259
260 user_info->mapped_state = false;
261 user_info->logon_parameters = 0;
262 user_info->flags = 0;
263 user_info->client.account_name = sess->nt1.in.user;
264 user_info->client.domain_name = sess->nt1.in.domain;
265 user_info->workstation_name = remote_machine;
266 user_info->remote_host = talloc_steal(user_info, remote_address);
267
268 user_info->password_state = AUTH_PASSWORD_RESPONSE;
269 user_info->password.response.lanman = sess->nt1.in.password1;
270 user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
271 user_info->password.response.nt = sess->nt1.in.password2;
272 user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
273
274 auth_check_password_send(auth_context, user_info,
275 sesssetup_nt1_send, req);
276 return;
277
278 nomem:
279 status = NT_STATUS_NO_MEMORY;
280 failed:
281 status = auth_nt_status_squash(status);
282 smbsrv_sesssetup_backend_send(req, sess, status);
283 }
284
285 struct sesssetup_spnego_state {
286 struct smbsrv_request *req;
287 union smb_sesssetup *sess;
288 struct smbsrv_session *smb_sess;
289 };
290
291 static void sesssetup_spnego_send(struct gensec_update_request *greq, void *private_data)
/* [<][>][^][v][top][bottom][index][help] */
292 {
293 struct sesssetup_spnego_state *s = talloc_get_type(private_data,
294 struct sesssetup_spnego_state);
295 struct smbsrv_request *req = s->req;
296 union smb_sesssetup *sess = s->sess;
297 struct smbsrv_session *smb_sess = s->smb_sess;
298 struct auth_session_info *session_info = NULL;
299 NTSTATUS status;
300 NTSTATUS skey_status;
301 DATA_BLOB session_key;
302
303 status = gensec_update_recv(greq, req, &sess->spnego.out.secblob);
304 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
305 goto done;
306 } else if (!NT_STATUS_IS_OK(status)) {
307 goto failed;
308 }
309
310 status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
311 if (!NT_STATUS_IS_OK(status)) goto failed;
312
313 skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
314 if (NT_STATUS_IS_OK(skey_status)) {
315 smbsrv_setup_signing(req->smb_conn, &session_key, NULL);
316 }
317
318 /* Ensure this is marked as a 'real' vuid, not one
319 * simply valid for the session setup leg */
320 status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
321 if (!NT_STATUS_IS_OK(status)) goto failed;
322
323 req->session = smb_sess;
324
325 done:
326 sess->spnego.out.vuid = smb_sess->vuid;
327 failed:
328 status = auth_nt_status_squash(status);
329 smbsrv_sesssetup_backend_send(req, sess, status);
330 if (!NT_STATUS_IS_OK(status) &&
331 !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
332 talloc_free(smb_sess);
333 }
334 }
335
336 /*
337 handler for SPNEGO style session setup
338 */
339 static void sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
/* [<][>][^][v][top][bottom][index][help] */
340 {
341 NTSTATUS status;
342 struct smbsrv_session *smb_sess = NULL;
343 struct sesssetup_spnego_state *s = NULL;
344 uint16_t vuid;
345
346 sess->spnego.out.vuid = 0;
347 sess->spnego.out.action = 0;
348
349 sesssetup_common_strings(req,
350 &sess->spnego.out.os,
351 &sess->spnego.out.lanman,
352 &sess->spnego.out.workgroup);
353
354 if (!req->smb_conn->negotiate.done_sesssetup) {
355 req->smb_conn->negotiate.max_send = sess->spnego.in.bufsize;
356 req->smb_conn->negotiate.client_caps = sess->spnego.in.capabilities;
357 }
358
359 vuid = SVAL(req->in.hdr,HDR_UID);
360
361 /* lookup an existing session */
362 smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
363 if (!smb_sess) {
364 struct gensec_security *gensec_ctx;
365
366 status = samba_server_gensec_start(req,
367 req->smb_conn->connection->event.ctx,
368 req->smb_conn->connection->msg_ctx,
369 req->smb_conn->lp_ctx,
370 req->smb_conn->negotiate.server_credentials,
371 "cifs",
372 &gensec_ctx);
373 if (!NT_STATUS_IS_OK(status)) {
374 DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
375 goto failed;
376 }
377
378 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
379
380 status = gensec_start_mech_by_oid(gensec_ctx, req->smb_conn->negotiate.oid);
381 if (!NT_STATUS_IS_OK(status)) {
382 DEBUG(1, ("Failed to start GENSEC %s server code: %s\n",
383 gensec_get_name_by_oid(gensec_ctx, req->smb_conn->negotiate.oid), nt_errstr(status)));
384 goto failed;
385 }
386
387 /* allocate a new session */
388 smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
389 if (!smb_sess) {
390 status = NT_STATUS_INSUFFICIENT_RESOURCES;
391 goto failed;
392 }
393 }
394
395 if (!smb_sess) {
396 status = NT_STATUS_ACCESS_DENIED;
397 goto failed;
398 }
399
400 if (!smb_sess->gensec_ctx) {
401 status = NT_STATUS_INTERNAL_ERROR;
402 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
403 goto failed;
404 }
405
406 s = talloc(req, struct sesssetup_spnego_state);
407 if (!s) goto nomem;
408 s->req = req;
409 s->sess = sess;
410 s->smb_sess = smb_sess;
411
412 gensec_update_send(smb_sess->gensec_ctx, sess->spnego.in.secblob,
413 sesssetup_spnego_send, s);
414 return;
415
416 nomem:
417 status = NT_STATUS_NO_MEMORY;
418 failed:
419 talloc_free(smb_sess);
420 status = auth_nt_status_squash(status);
421 smbsrv_sesssetup_backend_send(req, sess, status);
422 }
423
424 /*
425 backend for sessionsetup call - this takes all 3 variants of the call
426 */
427 void smbsrv_sesssetup_backend(struct smbsrv_request *req,
/* [<][>][^][v][top][bottom][index][help] */
428 union smb_sesssetup *sess)
429 {
430 switch (sess->old.level) {
431 case RAW_SESSSETUP_OLD:
432 sesssetup_old(req, sess);
433 return;
434
435 case RAW_SESSSETUP_NT1:
436 sesssetup_nt1(req, sess);
437 return;
438
439 case RAW_SESSSETUP_SPNEGO:
440 sesssetup_spnego(req, sess);
441 return;
442
443 case RAW_SESSSETUP_SMB2:
444 break;
445 }
446
447 smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_INVALID_LEVEL);
448 }