r26221: Add loadparm_context parameter to auth_context_create.
[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 #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,
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", lp_workgroup(global_loadparm));
44 }
45
46 static void smbsrv_sesssetup_backend_send(struct smbsrv_request *req,
47                                           union smb_sesssetup *sess,
48                                           NTSTATUS status)
49 {
50         if (NT_STATUS_IS_OK(status)) {
51                 req->smb_conn->negotiate.done_sesssetup = true;
52                 /* we need to keep the session long term */
53                 req->session = talloc_steal(req->smb_conn, req->session);
54         }
55         smbsrv_reply_sesssetup_send(req, sess, status);
56 }
57
58 static void sesssetup_old_send(struct auth_check_password_request *areq,
59                                void *private_data)
60 {
61         struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
62         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
63         struct auth_serversupplied_info *server_info = NULL;
64         struct auth_session_info *session_info;
65         struct smbsrv_session *smb_sess;
66         NTSTATUS status;
67
68         status = auth_check_password_recv(areq, req, &server_info);
69         if (!NT_STATUS_IS_OK(status)) goto failed;
70
71         /* This references server_info into session_info */
72         status = auth_generate_session_info(req, server_info, &session_info);
73         if (!NT_STATUS_IS_OK(status)) goto failed;
74
75         /* allocate a new session */
76         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
77         if (!smb_sess) {
78                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
79                 goto failed;
80         }
81
82         /* Ensure this is marked as a 'real' vuid, not one
83          * simply valid for the session setup leg */
84         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
85         if (!NT_STATUS_IS_OK(status)) goto failed;
86
87         /* To correctly process any AndX packet (like a tree connect)
88          * we need to fill in the session on the request here */
89         req->session = smb_sess;
90         sess->old.out.vuid = smb_sess->vuid;
91
92 failed:
93         status = auth_nt_status_squash(status);
94         smbsrv_sesssetup_backend_send(req, sess, status);
95 }
96
97 /*
98   handler for old style session setup
99 */
100 static void sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
101 {
102         struct auth_usersupplied_info *user_info = NULL;
103         struct socket_address *remote_address;
104         const char *remote_machine = NULL;
105
106         sess->old.out.vuid = 0;
107         sess->old.out.action = 0;
108
109         sesssetup_common_strings(req, 
110                                  &sess->old.out.os,
111                                  &sess->old.out.lanman,
112                                  &sess->old.out.domain);
113
114         if (!req->smb_conn->negotiate.done_sesssetup) {
115                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
116         }
117
118         if (req->smb_conn->negotiate.calling_name) {
119                 remote_machine = req->smb_conn->negotiate.calling_name->name;
120         }
121         
122         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
123         if (!remote_address) goto nomem;
124
125         if (!remote_machine) {
126                 remote_machine = remote_address->addr;
127         }
128
129         user_info = talloc(req, struct auth_usersupplied_info);
130         if (!user_info) goto nomem;
131         
132         user_info->mapped_state = false;
133         user_info->logon_parameters = 0;
134         user_info->flags = 0;
135         user_info->client.account_name = sess->old.in.user;
136         user_info->client.domain_name = sess->old.in.domain;
137         user_info->workstation_name = remote_machine;
138         user_info->remote_host = talloc_steal(user_info, remote_address);
139         
140         user_info->password_state = AUTH_PASSWORD_RESPONSE;
141         user_info->password.response.lanman = sess->old.in.password;
142         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
143         user_info->password.response.nt = data_blob(NULL, 0);
144
145         auth_check_password_send(req->smb_conn->negotiate.auth_context, user_info,
146                                  sesssetup_old_send, req);
147         return;
148
149 nomem:
150         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_NO_MEMORY);
151 }
152
153 static void sesssetup_nt1_send(struct auth_check_password_request *areq,
154                                void *private_data)
155 {
156         struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
157         union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
158         struct auth_serversupplied_info *server_info = NULL;
159         struct auth_session_info *session_info;
160         struct smbsrv_session *smb_sess;
161         NTSTATUS status;
162
163         status = auth_check_password_recv(areq, req, &server_info);
164         if (!NT_STATUS_IS_OK(status)) goto failed;
165
166         /* This references server_info into session_info */
167         status = auth_generate_session_info(req, server_info, &session_info);
168         if (!NT_STATUS_IS_OK(status)) goto failed;
169
170         /* allocate a new session */
171         smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
172         if (!smb_sess) {
173                 status = NT_STATUS_INSUFFICIENT_RESOURCES;
174                 goto failed;
175         }
176
177         /* Ensure this is marked as a 'real' vuid, not one
178          * simply valid for the session setup leg */
179         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
180         if (!NT_STATUS_IS_OK(status)) goto failed;
181
182         /* To correctly process any AndX packet (like a tree connect)
183          * we need to fill in the session on the request here */
184         req->session = smb_sess;
185         sess->nt1.out.vuid = smb_sess->vuid;
186
187         if (!session_info->server_info->authenticated) {
188                 /* don't try signing as anonymous */
189                 goto done;
190         }
191
192         if (!smbsrv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
193                 /* Already signing, or disabled */
194                 goto done;
195         }
196
197         /* Force check of the request packet, now we know the session key */
198         smbsrv_signing_check_incoming(req);
199 /* TODO: why don't we check the result here? */
200
201         /* Unfortunetly win2k3 as a client doesn't sign the request
202          * packet here, so we have to force signing to start again */
203
204         smbsrv_signing_restart(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2);
205
206 done:
207         status = NT_STATUS_OK;
208 failed:
209         status = auth_nt_status_squash(status);
210         smbsrv_sesssetup_backend_send(req, sess, status);
211 }
212
213 /*
214   handler for NT1 style session setup
215 */
216 static void sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
217 {
218         NTSTATUS status;
219         struct auth_context *auth_context;
220         struct auth_usersupplied_info *user_info = NULL;
221         struct socket_address *remote_address;
222         const char *remote_machine = NULL;
223         
224         sess->nt1.out.vuid = 0;
225         sess->nt1.out.action = 0;
226
227         sesssetup_common_strings(req, 
228                                  &sess->nt1.out.os,
229                                  &sess->nt1.out.lanman,
230                                  &sess->nt1.out.domain);
231
232         if (!req->smb_conn->negotiate.done_sesssetup) {
233                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
234                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
235         }
236
237         if (req->smb_conn->negotiate.oid) {
238                 if (sess->nt1.in.user && *sess->nt1.in.user) {
239                         /* We can't accept a normal login, because we
240                          * don't have a challenge */
241                         status = NT_STATUS_LOGON_FAILURE;
242                         goto failed;
243                 }
244
245                 /* TODO: should we use just "anonymous" here? */
246                 status = auth_context_create(req, 
247                                              req->smb_conn->connection->event.ctx,
248                                              req->smb_conn->connection->msg_ctx,
249                                              global_loadparm,
250                                              &auth_context);
251                 if (!NT_STATUS_IS_OK(status)) goto failed;
252         } else {
253                 auth_context = req->smb_conn->negotiate.auth_context;
254         }
255
256         if (req->smb_conn->negotiate.calling_name) {
257                 remote_machine = req->smb_conn->negotiate.calling_name->name;
258         }
259
260         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
261         if (!remote_address) goto nomem;
262
263         if (!remote_machine) {
264                 remote_machine = remote_address->addr;
265         }
266
267         user_info = talloc(req, struct auth_usersupplied_info);
268         if (!user_info) goto nomem;
269
270         user_info->mapped_state = false;
271         user_info->logon_parameters = 0;
272         user_info->flags = 0;
273         user_info->client.account_name = sess->nt1.in.user;
274         user_info->client.domain_name = sess->nt1.in.domain;
275         user_info->workstation_name = remote_machine;
276         user_info->remote_host = talloc_steal(user_info, remote_address);
277         
278         user_info->password_state = AUTH_PASSWORD_RESPONSE;
279         user_info->password.response.lanman = sess->nt1.in.password1;
280         user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
281         user_info->password.response.nt = sess->nt1.in.password2;
282         user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
283
284         auth_check_password_send(auth_context, user_info,
285                                  sesssetup_nt1_send, req);
286         return;
287
288 nomem:
289         status = NT_STATUS_NO_MEMORY;
290 failed:
291         status = auth_nt_status_squash(status);
292         smbsrv_sesssetup_backend_send(req, sess, status);
293 }
294
295 struct sesssetup_spnego_state {
296         struct smbsrv_request *req;
297         union smb_sesssetup *sess;
298         struct smbsrv_session *smb_sess;
299 };
300
301 static void sesssetup_spnego_send(struct gensec_update_request *greq, void *private_data)
302 {
303         struct sesssetup_spnego_state *s = talloc_get_type(private_data,
304                                            struct sesssetup_spnego_state);
305         struct smbsrv_request *req = s->req;
306         union smb_sesssetup *sess = s->sess;
307         struct smbsrv_session *smb_sess = s->smb_sess;
308         struct auth_session_info *session_info = NULL;
309         NTSTATUS status;
310         NTSTATUS skey_status;
311         DATA_BLOB session_key;
312
313         status = gensec_update_recv(greq, req, &sess->spnego.out.secblob);
314         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
315                 goto done;
316         } else if (!NT_STATUS_IS_OK(status)) {
317                 goto failed;
318         }
319
320         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
321         if (!NT_STATUS_IS_OK(status)) goto failed;
322
323         skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
324         if (NT_STATUS_IS_OK(skey_status) &&
325             session_info->server_info->authenticated &&
326             smbsrv_setup_signing(req->smb_conn, &session_key, NULL)) {
327                 /* Force check of the request packet, now we know the session key */
328                 smbsrv_signing_check_incoming(req);
329
330                 smbsrv_signing_restart(req->smb_conn, &session_key, NULL);
331         }
332
333         /* Ensure this is marked as a 'real' vuid, not one
334          * simply valid for the session setup leg */
335         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
336         if (!NT_STATUS_IS_OK(status)) goto failed;
337
338         req->session = smb_sess;
339
340 done:
341         sess->spnego.out.vuid = smb_sess->vuid;
342 failed:
343         status = auth_nt_status_squash(status);
344         smbsrv_sesssetup_backend_send(req, sess, status);
345         if (!NT_STATUS_IS_OK(status) && 
346             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
347                 talloc_free(smb_sess);
348         }
349 }
350
351 /*
352   handler for SPNEGO style session setup
353 */
354 static void sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
355 {
356         NTSTATUS status;
357         struct smbsrv_session *smb_sess = NULL;
358         struct sesssetup_spnego_state *s = NULL;
359         uint16_t vuid;
360
361         sess->spnego.out.vuid = 0;
362         sess->spnego.out.action = 0;
363
364         sesssetup_common_strings(req, 
365                                  &sess->spnego.out.os,
366                                  &sess->spnego.out.lanman,
367                                  &sess->spnego.out.workgroup);
368
369         if (!req->smb_conn->negotiate.done_sesssetup) {
370                 req->smb_conn->negotiate.max_send = sess->spnego.in.bufsize;
371                 req->smb_conn->negotiate.client_caps = sess->spnego.in.capabilities;
372         }
373
374         vuid = SVAL(req->in.hdr,HDR_UID);
375
376         /* lookup an existing session */
377         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
378         if (!smb_sess) {
379                 struct gensec_security *gensec_ctx;
380
381                 status = gensec_server_start(req,
382                                              req->smb_conn->connection->event.ctx,
383                                              req->smb_conn->connection->msg_ctx,
384                                              &gensec_ctx);
385                 if (!NT_STATUS_IS_OK(status)) {
386                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
387                         goto failed;
388                 }
389
390                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
391
392                 gensec_set_target_service(gensec_ctx, "cifs");
393
394                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
395
396                 status = gensec_start_mech_by_oid(gensec_ctx, req->smb_conn->negotiate.oid);
397                 if (!NT_STATUS_IS_OK(status)) {
398                         DEBUG(1, ("Failed to start GENSEC %s server code: %s\n", 
399                                   gensec_get_name_by_oid(req->smb_conn->negotiate.oid), nt_errstr(status)));
400                         goto failed;
401                 }
402
403                 /* allocate a new session */
404                 smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
405                 if (!smb_sess) {
406                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
407                         goto failed;
408                 }
409         }
410
411         if (!smb_sess) {
412                 status = NT_STATUS_ACCESS_DENIED;
413                 goto failed;
414         }
415
416         if (!smb_sess->gensec_ctx) {
417                 status = NT_STATUS_INTERNAL_ERROR;
418                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
419                 goto failed;
420         }
421
422         s = talloc(req, struct sesssetup_spnego_state);
423         if (!s) goto nomem;
424         s->req          = req;
425         s->sess         = sess;
426         s->smb_sess     = smb_sess;
427
428         gensec_update_send(smb_sess->gensec_ctx, sess->spnego.in.secblob,
429                            sesssetup_spnego_send, s);
430         return;
431
432 nomem:
433         status = NT_STATUS_NO_MEMORY;
434 failed:
435         talloc_free(smb_sess);
436         status = auth_nt_status_squash(status);
437         smbsrv_sesssetup_backend_send(req, sess, status);
438 }
439
440 /*
441   backend for sessionsetup call - this takes all 3 variants of the call
442 */
443 void smbsrv_sesssetup_backend(struct smbsrv_request *req,
444                               union smb_sesssetup *sess)
445 {
446         switch (sess->old.level) {
447                 case RAW_SESSSETUP_OLD:
448                         sesssetup_old(req, sess);
449                         return;
450
451                 case RAW_SESSSETUP_NT1:
452                         sesssetup_nt1(req, sess);
453                         return;
454
455                 case RAW_SESSSETUP_SPNEGO:
456                         sesssetup_spnego(req, sess);
457                         return;
458
459                 case RAW_SESSSETUP_SMB2:
460                         break;
461         }
462
463         smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_INVALID_LEVEL);
464 }