647006028665312fa0396a664c6dafcaff5b9fe5
[kai/samba-autobuild/.git] / source4 / smb_server / smb / sesssetup.c
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
34 /*
35   setup the OS, Lanman and domain portions of a session setup reply
36 */
37 static void sesssetup_common_strings(struct smbsrv_request *req,
38                                      char **os, char **lanman, char **domain)
39 {
40         (*os) = talloc_asprintf(req, "Unix");
41         (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
42         (*domain) = talloc_asprintf(req, "%s", lp_workgroup());
43 }
44
45 static void smbsrv_sesssetup_backend_send(struct smbsrv_request *req,
46                                           union smb_sesssetup *sess,
47                                           NTSTATUS status)
48 {
49         if (NT_STATUS_IS_OK(status)) {
50                 req->smb_conn->negotiate.done_sesssetup = True;
51                 /* we need to keep the session long term */
52                 req->session = talloc_steal(req->smb_conn, req->session);
53         }
54         smbsrv_reply_sesssetup_send(req, sess, status);
55 }
56
57 static void sesssetup_old_send(struct auth_check_password_request *areq,
58                                void *private_data)
59 {
60         struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
61         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
62         struct auth_serversupplied_info *server_info = NULL;
63         struct auth_session_info *session_info;
64         struct smbsrv_session *smb_sess;
65         NTSTATUS status;
66
67         status = auth_check_password_recv(areq, req, &server_info);
68         if (!NT_STATUS_IS_OK(status)) goto failed;
69
70         /* This references server_info into session_info */
71         status = auth_generate_session_info(req, server_info, &session_info);
72         if (!NT_STATUS_IS_OK(status)) goto failed;
73
74         /* allocate a new session */
75         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
76         if (!smb_sess) {
77                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
78                 goto failed;
79         }
80
81         /* Ensure this is marked as a 'real' vuid, not one
82          * simply valid for the session setup leg */
83         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
84         if (!NT_STATUS_IS_OK(status)) goto failed;
85
86         /* To correctly process any AndX packet (like a tree connect)
87          * we need to fill in the session on the request here */
88         req->session = smb_sess;
89         sess->old.out.vuid = smb_sess->vuid;
90
91 failed:
92         status = auth_nt_status_squash(status);
93         smbsrv_sesssetup_backend_send(req, sess, status);
94 }
95
96 /*
97   handler for old style session setup
98 */
99 static void sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
100 {
101         struct auth_usersupplied_info *user_info = NULL;
102         struct socket_address *remote_address;
103         const char *remote_machine = NULL;
104
105         sess->old.out.vuid = 0;
106         sess->old.out.action = 0;
107
108         sesssetup_common_strings(req, 
109                                  &sess->old.out.os,
110                                  &sess->old.out.lanman,
111                                  &sess->old.out.domain);
112
113         if (!req->smb_conn->negotiate.done_sesssetup) {
114                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
115         }
116
117         if (req->smb_conn->negotiate.calling_name) {
118                 remote_machine = req->smb_conn->negotiate.calling_name->name;
119         }
120         
121         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
122         if (!remote_address) goto nomem;
123
124         if (!remote_machine) {
125                 remote_machine = remote_address->addr;
126         }
127
128         user_info = talloc(req, struct auth_usersupplied_info);
129         if (!user_info) goto nomem;
130         
131         user_info->mapped_state = False;
132         user_info->logon_parameters = 0;
133         user_info->flags = 0;
134         user_info->client.account_name = sess->old.in.user;
135         user_info->client.domain_name = sess->old.in.domain;
136         user_info->workstation_name = remote_machine;
137         user_info->remote_host = talloc_steal(user_info, remote_address);
138         
139         user_info->password_state = AUTH_PASSWORD_RESPONSE;
140         user_info->password.response.lanman = sess->old.in.password;
141         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
142         user_info->password.response.nt = data_blob(NULL, 0);
143
144         auth_check_password_send(req->smb_conn->negotiate.auth_context, user_info,
145                                  sesssetup_old_send, req);
146         return;
147
148 nomem:
149         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_NO_MEMORY);
150 }
151
152 static void sesssetup_nt1_send(struct auth_check_password_request *areq,
153                                void *private_data)
154 {
155         struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
156         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
157         struct auth_serversupplied_info *server_info = NULL;
158         struct auth_session_info *session_info;
159         struct smbsrv_session *smb_sess;
160         NTSTATUS status;
161
162         status = auth_check_password_recv(areq, req, &server_info);
163         if (!NT_STATUS_IS_OK(status)) goto failed;
164
165         /* This references server_info into session_info */
166         status = auth_generate_session_info(req, server_info, &session_info);
167         if (!NT_STATUS_IS_OK(status)) goto failed;
168
169         /* allocate a new session */
170         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
171         if (!smb_sess) {
172                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
173                 goto failed;
174         }
175
176         /* Ensure this is marked as a 'real' vuid, not one
177          * simply valid for the session setup leg */
178         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
179         if (!NT_STATUS_IS_OK(status)) goto failed;
180
181         /* To correctly process any AndX packet (like a tree connect)
182          * we need to fill in the session on the request here */
183         req->session = smb_sess;
184         sess->nt1.out.vuid = smb_sess->vuid;
185
186         if (!session_info->server_info->authenticated) {
187                 /* don't try signing as anonymous */
188                 goto done;
189         }
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         /* Force check of the request packet, now we know the session key */
197         smbsrv_signing_check_incoming(req);
198 /* TODO: why don't we check the result here? */
199
200         /* Unfortunetly win2k3 as a client doesn't sign the request
201          * packet here, so we have to force signing to start again */
202
203         smbsrv_signing_restart(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2);
204
205 done:
206         status = NT_STATUS_OK;
207 failed:
208         status = auth_nt_status_squash(status);
209         smbsrv_sesssetup_backend_send(req, sess, status);
210 }
211
212 /*
213   handler for NT1 style session setup
214 */
215 static void sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
216 {
217         NTSTATUS status;
218         struct auth_context *auth_context;
219         struct auth_usersupplied_info *user_info = NULL;
220         struct socket_address *remote_address;
221         const char *remote_machine = NULL;
222         
223         sess->nt1.out.vuid = 0;
224         sess->nt1.out.action = 0;
225
226         sesssetup_common_strings(req, 
227                                  &sess->nt1.out.os,
228                                  &sess->nt1.out.lanman,
229                                  &sess->nt1.out.domain);
230
231         if (!req->smb_conn->negotiate.done_sesssetup) {
232                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
233                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
234         }
235
236         if (req->smb_conn->negotiate.oid) {
237                 if (sess->nt1.in.user && *sess->nt1.in.user) {
238                         /* We can't accept a normal login, because we
239                          * don't have a challenge */
240                         status = NT_STATUS_LOGON_FAILURE;
241                         goto failed;
242                 }
243
244                 /* TODO: should we use just "anonymous" here? */
245                 status = auth_context_create(req, 
246                                              req->smb_conn->connection->event.ctx,
247                                              req->smb_conn->connection->msg_ctx,
248                                              &auth_context);
249                 if (!NT_STATUS_IS_OK(status)) goto failed;
250         } else {
251                 auth_context = req->smb_conn->negotiate.auth_context;
252         }
253
254         if (req->smb_conn->negotiate.calling_name) {
255                 remote_machine = req->smb_conn->negotiate.calling_name->name;
256         }
257
258         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
259         if (!remote_address) goto nomem;
260
261         if (!remote_machine) {
262                 remote_machine = remote_address->addr;
263         }
264
265         user_info = talloc(req, struct auth_usersupplied_info);
266         if (!user_info) goto nomem;
267
268         user_info->mapped_state = False;
269         user_info->logon_parameters = 0;
270         user_info->flags = 0;
271         user_info->client.account_name = sess->nt1.in.user;
272         user_info->client.domain_name = sess->nt1.in.domain;
273         user_info->workstation_name = remote_machine;
274         user_info->remote_host = talloc_steal(user_info, remote_address);
275         
276         user_info->password_state = AUTH_PASSWORD_RESPONSE;
277         user_info->password.response.lanman = sess->nt1.in.password1;
278         user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
279         user_info->password.response.nt = sess->nt1.in.password2;
280         user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
281
282         auth_check_password_send(auth_context, user_info,
283                                  sesssetup_nt1_send, req);
284         return;
285
286 nomem:
287         status = NT_STATUS_NO_MEMORY;
288 failed:
289         status = auth_nt_status_squash(status);
290         smbsrv_sesssetup_backend_send(req, sess, status);
291 }
292
293 struct sesssetup_spnego_state {
294         struct smbsrv_request *req;
295         union smb_sesssetup *sess;
296         struct smbsrv_session *smb_sess;
297 };
298
299 static void sesssetup_spnego_send(struct gensec_update_request *greq, void *private_data)
300 {
301         struct sesssetup_spnego_state *s = talloc_get_type(private_data,
302                                            struct sesssetup_spnego_state);
303         struct smbsrv_request *req = s->req;
304         union smb_sesssetup *sess = s->sess;
305         struct smbsrv_session *smb_sess = s->smb_sess;
306         struct auth_session_info *session_info = NULL;
307         NTSTATUS status;
308         NTSTATUS skey_status;
309         DATA_BLOB session_key;
310
311         status = gensec_update_recv(greq, req, &sess->spnego.out.secblob);
312         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
313                 goto done;
314         } else if (!NT_STATUS_IS_OK(status)) {
315                 goto failed;
316         }
317
318         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
319         if (!NT_STATUS_IS_OK(status)) goto failed;
320
321         skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
322         if (NT_STATUS_IS_OK(skey_status) &&
323             session_info->server_info->authenticated &&
324             smbsrv_setup_signing(req->smb_conn, &session_key, NULL)) {
325                 /* Force check of the request packet, now we know the session key */
326                 smbsrv_signing_check_incoming(req);
327
328                 smbsrv_signing_restart(req->smb_conn, &session_key, NULL);
329         }
330
331         /* Ensure this is marked as a 'real' vuid, not one
332          * simply valid for the session setup leg */
333         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
334         if (!NT_STATUS_IS_OK(status)) goto failed;
335
336         req->session = smb_sess;
337
338 done:
339         sess->spnego.out.vuid = smb_sess->vuid;
340 failed:
341         status = auth_nt_status_squash(status);
342         smbsrv_sesssetup_backend_send(req, sess, status);
343         if (!NT_STATUS_IS_OK(status) && 
344             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
345                 talloc_free(smb_sess);
346         }
347 }
348
349 /*
350   handler for SPNEGO style session setup
351 */
352 static void sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
353 {
354         NTSTATUS status;
355         struct smbsrv_session *smb_sess = NULL;
356         struct sesssetup_spnego_state *s = NULL;
357         uint16_t vuid;
358
359         sess->spnego.out.vuid = 0;
360         sess->spnego.out.action = 0;
361
362         sesssetup_common_strings(req, 
363                                  &sess->spnego.out.os,
364                                  &sess->spnego.out.lanman,
365                                  &sess->spnego.out.workgroup);
366
367         if (!req->smb_conn->negotiate.done_sesssetup) {
368                 req->smb_conn->negotiate.max_send = sess->spnego.in.bufsize;
369                 req->smb_conn->negotiate.client_caps = sess->spnego.in.capabilities;
370         }
371
372         vuid = SVAL(req->in.hdr,HDR_UID);
373
374         /* lookup an existing session */
375         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
376         if (!smb_sess) {
377                 struct gensec_security *gensec_ctx;
378
379                 status = gensec_server_start(req,
380                                              req->smb_conn->connection->event.ctx,
381                                              req->smb_conn->connection->msg_ctx,
382                                              &gensec_ctx);
383                 if (!NT_STATUS_IS_OK(status)) {
384                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
385                         goto failed;
386                 }
387
388                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
389
390                 gensec_set_target_service(gensec_ctx, "cifs");
391
392                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
393
394                 status = gensec_start_mech_by_oid(gensec_ctx, req->smb_conn->negotiate.oid);
395                 if (!NT_STATUS_IS_OK(status)) {
396                         DEBUG(1, ("Failed to start GENSEC %s server code: %s\n", 
397                                   gensec_get_name_by_oid(req->smb_conn->negotiate.oid), nt_errstr(status)));
398                         goto failed;
399                 }
400
401                 /* allocate a new session */
402                 smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
403                 if (!smb_sess) {
404                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
405                         goto failed;
406                 }
407         }
408
409         if (!smb_sess) {
410                 status = NT_STATUS_ACCESS_DENIED;
411                 goto failed;
412         }
413
414         if (!smb_sess->gensec_ctx) {
415                 status = NT_STATUS_INTERNAL_ERROR;
416                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
417                 goto failed;
418         }
419
420         s = talloc(req, struct sesssetup_spnego_state);
421         if (!s) goto nomem;
422         s->req          = req;
423         s->sess         = sess;
424         s->smb_sess     = smb_sess;
425
426         gensec_update_send(smb_sess->gensec_ctx, sess->spnego.in.secblob,
427                            sesssetup_spnego_send, s);
428         return;
429
430 nomem:
431         status = NT_STATUS_NO_MEMORY;
432 failed:
433         talloc_free(smb_sess);
434         status = auth_nt_status_squash(status);
435         smbsrv_sesssetup_backend_send(req, sess, status);
436 }
437
438 /*
439   backend for sessionsetup call - this takes all 3 variants of the call
440 */
441 void smbsrv_sesssetup_backend(struct smbsrv_request *req,
442                               union smb_sesssetup *sess)
443 {
444         switch (sess->old.level) {
445                 case RAW_SESSSETUP_OLD:
446                         sesssetup_old(req, sess);
447                         return;
448
449                 case RAW_SESSSETUP_NT1:
450                         sesssetup_nt1(req, sess);
451                         return;
452
453                 case RAW_SESSSETUP_SPNEGO:
454                         sesssetup_spnego(req, sess);
455                         return;
456
457                 case RAW_SESSSETUP_SMB2:
458                         break;
459         }
460
461         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_INVALID_LEVEL);
462 }