Fix Samba4 build errors with common libcli/samsync
[ira/wip.git] / source4 / auth / ntlmssp / ntlmssp_server.c
1 /* 
2    Unix SMB/Netbios implementation.
3    Version 3.0
4    handle NLTMSSP, client server side parsing
5
6    Copyright (C) Andrew Tridgell      2001
7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
8    Copyright (C) Stefan Metzmacher 2005
9
10    This program is free software; you can redistribute it and/or modify
11    it under the terms of the GNU General Public License as published by
12    the Free Software Foundation; either version 3 of the License, or
13    (at your option) any later version.
14    
15    This program is distributed in the hope that it will be useful,
16    but WITHOUT ANY WARRANTY; without even the implied warranty of
17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18    GNU General Public License for more details.
19    
20    You should have received a copy of the GNU General Public License
21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
22 */
23
24 #include "includes.h"
25 #include "system/network.h"
26 #include "auth/ntlmssp/ntlmssp.h"
27 #include "../libcli/auth/libcli_auth.h"
28 #include "../lib/crypto/crypto.h"
29 #include "auth/credentials/credentials.h"
30 #include "auth/gensec/gensec.h"
31 #include "auth/auth.h"
32 #include "auth/ntlm/auth_proto.h"
33 #include "param/param.h"
34 #include "auth/session_proto.h"
35
36 /** 
37  * Set a username on an NTLMSSP context - ensures it is talloc()ed 
38  *
39  */
40
41 static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user) 
42 {
43         if (!user) {
44                 /* it should be at least "" */
45                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
46                 return NT_STATUS_INVALID_PARAMETER;
47         }
48         gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user);
49         if (!gensec_ntlmssp_state->user) {
50                 return NT_STATUS_NO_MEMORY;
51         }
52         return NT_STATUS_OK;
53 }
54
55 /** 
56  * Set a domain on an NTLMSSP context - ensures it is talloc()ed 
57  *
58  */
59 static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain) 
60 {
61         gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain);
62         if (!gensec_ntlmssp_state->domain) {
63                 return NT_STATUS_NO_MEMORY;
64         }
65         return NT_STATUS_OK;
66 }
67
68 /** 
69  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed 
70  *
71  */
72 static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation) 
73 {
74         gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation);
75         if (!gensec_ntlmssp_state->workstation) {
76                 return NT_STATUS_NO_MEMORY;
77         }
78         return NT_STATUS_OK;
79 }
80
81 /**
82  * Determine correct target name flags for reply, given server role 
83  * and negotiated flags
84  * 
85  * @param gensec_ntlmssp_state NTLMSSP State
86  * @param neg_flags The flags from the packet
87  * @param chal_flags The flags to be set in the reply packet
88  * @return The 'target name' string.
89  */
90
91 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
92                                        uint32_t neg_flags, uint32_t *chal_flags) 
93 {
94         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
95                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
96                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
97                 if (gensec_ntlmssp_state->server_role == ROLE_STANDALONE) {
98                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
99                         return gensec_ntlmssp_state->server_name;
100                 } else {
101                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
102                         return gensec_ntlmssp_state->domain;
103                 };
104         } else {
105                 return "";
106         }
107 }
108
109
110
111 /**
112  * Next state function for the Negotiate packet
113  * 
114  * @param gensec_security GENSEC state
115  * @param out_mem_ctx Memory context for *out
116  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
117  * @param out The reply, as an allocated DATA_BLOB, caller to free.
118  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required. 
119  */
120
121 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security, 
122                                   TALLOC_CTX *out_mem_ctx, 
123                                   const DATA_BLOB in, DATA_BLOB *out) 
124 {
125         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
126         DATA_BLOB struct_blob;
127         uint32_t neg_flags = 0;
128         uint32_t ntlmssp_command, chal_flags;
129         const uint8_t *cryptkey;
130         const char *target_name;
131
132         /* parse the NTLMSSP packet */
133 #if 0
134         file_save("ntlmssp_negotiate.dat", request.data, request.length);
135 #endif
136
137         if (in.length) {
138                 if ((in.length < 16) || !msrpc_parse(out_mem_ctx, 
139                                                          &in, "Cdd",
140                                                          "NTLMSSP",
141                                                          &ntlmssp_command,
142                                                          &neg_flags)) {
143                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
144                                 "NTLMSSP Negotiate of length %u:\n",
145                                 (unsigned int)in.length ));
146                         dump_data(2, in.data, in.length);
147                         return NT_STATUS_INVALID_PARAMETER;
148                 }
149                 debug_ntlmssp_flags(neg_flags);
150         }
151         
152         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
153
154         /* Ask our caller what challenge they would like in the packet */
155         cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state);
156         if (!cryptkey) {
157                 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
158                 return NT_STATUS_INTERNAL_ERROR;
159         }
160
161         /* Check if we may set the challenge */
162         if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) {
163                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
164         }
165
166         /* The flags we send back are not just the negotiated flags,
167          * they are also 'what is in this packet'.  Therfore, we
168          * operate on 'chal_flags' from here on 
169          */
170
171         chal_flags = gensec_ntlmssp_state->neg_flags;
172
173         /* get the right name to fill in as 'target' */
174         target_name = ntlmssp_target_name(gensec_ntlmssp_state, 
175                                           neg_flags, &chal_flags); 
176         if (target_name == NULL) 
177                 return NT_STATUS_INVALID_PARAMETER;
178
179         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
180         gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
181
182         /* This creates the 'blob' of names that appears at the end of the packet */
183         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
184                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
185                 const char *target_name_dns = "";
186
187                 /* Find out the DNS domain name */
188                 dnsdomname[0] = '\0';
189                 safe_strcpy(dnsdomname, lp_realm(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1);
190                 strlower_m(dnsdomname);
191
192                 /* Find out the DNS host name */
193                 safe_strcpy(dnsname, gensec_ntlmssp_state->server_name, sizeof(dnsname) - 1);
194                 if (dnsdomname[0] != '\0') {
195                         safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
196                         safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
197                 }
198                 strlower_m(dnsname);
199
200                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
201                         target_name_dns = dnsdomname;
202                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
203                         target_name_dns = dnsname;
204                 }
205
206                 msrpc_gen(out_mem_ctx, 
207                           &struct_blob, "aaaaa",
208                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
209                           NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name,
210                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
211                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
212                           0, "");
213         } else {
214                 struct_blob = data_blob(NULL, 0);
215         }
216
217         {
218                 /* Marshal the packet in the right format, be it unicode or ASCII */
219                 const char *gen_string;
220                 if (gensec_ntlmssp_state->unicode) {
221                         gen_string = "CdUdbddB";
222                 } else {
223                         gen_string = "CdAdbddB";
224                 }
225                 
226                 msrpc_gen(out_mem_ctx, 
227                           out, gen_string,
228                           "NTLMSSP", 
229                           NTLMSSP_CHALLENGE,
230                           target_name,
231                           chal_flags,
232                           cryptkey, 8,
233                           0, 0,
234                           struct_blob.data, struct_blob.length);
235         }
236                 
237         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
238
239         return NT_STATUS_MORE_PROCESSING_REQUIRED;
240 }
241
242 /**
243  * Next state function for the Authenticate packet
244  * 
245  * @param gensec_ntlmssp_state NTLMSSP State
246  * @param request The request, as a DATA_BLOB
247  * @return Errors or NT_STATUS_OK. 
248  */
249
250 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
251                                        const DATA_BLOB request) 
252 {
253         uint32_t ntlmssp_command, auth_flags;
254         NTSTATUS nt_status;
255
256         uint8_t session_nonce_hash[16];
257
258         const char *parse_string;
259         char *domain = NULL;
260         char *user = NULL;
261         char *workstation = NULL;
262
263 #if 0
264         file_save("ntlmssp_auth.dat", request.data, request.length);
265 #endif
266
267         if (gensec_ntlmssp_state->unicode) {
268                 parse_string = "CdBBUUUBd";
269         } else {
270                 parse_string = "CdBBAAABd";
271         }
272
273         /* zero these out */
274         data_blob_free(&gensec_ntlmssp_state->lm_resp);
275         data_blob_free(&gensec_ntlmssp_state->nt_resp);
276         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
277
278         gensec_ntlmssp_state->user = NULL;
279         gensec_ntlmssp_state->domain = NULL;
280         gensec_ntlmssp_state->workstation = NULL;
281
282         /* now the NTLMSSP encoded auth hashes */
283         if (!msrpc_parse(gensec_ntlmssp_state, 
284                          &request, parse_string,
285                          "NTLMSSP", 
286                          &ntlmssp_command, 
287                          &gensec_ntlmssp_state->lm_resp,
288                          &gensec_ntlmssp_state->nt_resp,
289                          &domain, 
290                          &user, 
291                          &workstation,
292                          &gensec_ntlmssp_state->encrypted_session_key,
293                          &auth_flags)) {
294                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
295                 dump_data(10, request.data, request.length);
296
297                 /* zero this out */
298                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
299                 auth_flags = 0;
300                 
301                 /* Try again with a shorter string (Win9X truncates this packet) */
302                 if (gensec_ntlmssp_state->unicode) {
303                         parse_string = "CdBBUUU";
304                 } else {
305                         parse_string = "CdBBAAA";
306                 }
307
308                 /* now the NTLMSSP encoded auth hashes */
309                 if (!msrpc_parse(gensec_ntlmssp_state, 
310                                  &request, parse_string,
311                                  "NTLMSSP", 
312                                  &ntlmssp_command, 
313                                  &gensec_ntlmssp_state->lm_resp,
314                                  &gensec_ntlmssp_state->nt_resp,
315                                  &domain, 
316                                  &user, 
317                                  &workstation)) {
318                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
319                         dump_data(2, request.data, request.length);
320
321                         return NT_STATUS_INVALID_PARAMETER;
322                 }
323         }
324
325         if (auth_flags)
326                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
327
328         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
329                 /* zero this out */
330                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
331                 return nt_status;
332         }
333
334         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
335                 /* zero this out */
336                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
337                 return nt_status;
338         }
339
340         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
341                 /* zero this out */
342                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
343                 return nt_status;
344         }
345
346         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
347                  gensec_ntlmssp_state->user, gensec_ntlmssp_state->domain, gensec_ntlmssp_state->workstation, (unsigned long)gensec_ntlmssp_state->lm_resp.length, (unsigned long)gensec_ntlmssp_state->nt_resp.length));
348
349 #if 0
350         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
351         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
352 #endif
353
354         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a 
355            client challenge 
356         
357            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
358         */
359         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
360                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
361                         struct MD5Context md5_session_nonce_ctx;
362                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data 
363                                    && gensec_ntlmssp_state->internal_chal.length == 8);
364                         
365                         gensec_ntlmssp_state->doing_ntlm2 = true;
366
367                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
368                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
369                         
370                         MD5Init(&md5_session_nonce_ctx);
371                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
372                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
373                         
374                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, 
375                                                                session_nonce_hash, 8);
376
377                         /* LM response is no longer useful, zero it out */
378                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
379
380                         /* We changed the effective challenge - set it */
381                         if (!NT_STATUS_IS_OK(nt_status = 
382                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state, 
383                                                                                  &gensec_ntlmssp_state->chal))) {
384                                 /* zero this out */
385                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
386                                 return nt_status;
387                         }
388
389                         /* LM Key is incompatible... */
390                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
391                 }
392         }
393         return NT_STATUS_OK;
394 }
395
396 /**
397  * Next state function for the Authenticate packet 
398  * (after authentication - figures out the session keys etc)
399  * 
400  * @param gensec_ntlmssp_state NTLMSSP State
401  * @return Errors or NT_STATUS_OK. 
402  */
403
404 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security, 
405                                         DATA_BLOB *user_session_key, 
406                                         DATA_BLOB *lm_session_key) 
407 {
408         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
409         NTSTATUS nt_status;
410         DATA_BLOB session_key = data_blob(NULL, 0);
411
412         if (user_session_key)
413                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
414
415         if (lm_session_key) 
416                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
417
418         /* Handle the different session key derivation for NTLM2 */
419         if (gensec_ntlmssp_state->doing_ntlm2) {
420                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
421                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
422                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 
423                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
424                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
425                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
426                         
427                 } else {
428                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
429                         session_key = data_blob(NULL, 0);
430                 }
431         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) 
432                 /* Ensure we can never get here on NTLMv2 */
433                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
434
435                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
436                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
437                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
438                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data, 
439                                                           session_key.data);
440                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
441                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
442                         } else {
443                                 
444                                 /* When there is no LM response, just use zeros */
445                                 static const uint8_t zeros[24];
446                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
447                                 SMBsesskeygen_lm_sess_key(zeros, zeros, 
448                                                           session_key.data);
449                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
450                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
451                         }
452                 } else {
453                         /* LM Key not selected */
454                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
455
456                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
457                         session_key = data_blob(NULL, 0);
458                 }
459
460         } else if (user_session_key && user_session_key->data) {
461                 session_key = *user_session_key;
462                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
463                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
464
465                 /* LM Key not selected */
466                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
467
468         } else if (lm_session_key && lm_session_key->data) {
469                 /* Very weird to have LM key, but no user session key, but anyway.. */
470                 session_key = *lm_session_key;
471                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
472                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
473
474                 /* LM Key not selected */
475                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
476
477         } else {
478                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
479                 session_key = data_blob(NULL, 0);
480
481                 /* LM Key not selected */
482                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
483         }
484
485         /* With KEY_EXCH, the client supplies the proposed session key, 
486            but encrypts it with the long-term key */
487         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
488                 if (!gensec_ntlmssp_state->encrypted_session_key.data 
489                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
490                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
491                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n", 
492                                   (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
493                         return NT_STATUS_INVALID_PARAMETER;
494                 } else if (!session_key.data || session_key.length != 16) {
495                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n", 
496                                   (unsigned)session_key.length));
497                         gensec_ntlmssp_state->session_key = session_key;
498                 } else {
499                         dump_data_pw("KEY_EXCH session key (enc):\n", 
500                                      gensec_ntlmssp_state->encrypted_session_key.data, 
501                                      gensec_ntlmssp_state->encrypted_session_key.length);
502                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data, 
503                                       session_key.data, 
504                                       gensec_ntlmssp_state->encrypted_session_key.length);
505                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state, 
506                                                                       gensec_ntlmssp_state->encrypted_session_key.data, 
507                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
508                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data, 
509                                      gensec_ntlmssp_state->encrypted_session_key.length);
510                 }
511         } else {
512                 gensec_ntlmssp_state->session_key = session_key;
513         }
514
515         /* keep the session key around on the new context */
516         talloc_steal(gensec_ntlmssp_state, session_key.data);
517
518         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
519             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
520                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
521         } else {
522                 nt_status = NT_STATUS_OK;
523         }
524
525         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
526         
527         /* allow arbitarily many authentications, but watch that this will cause a 
528            memory leak, until the gensec_ntlmssp_state is shutdown 
529         */
530
531         if (gensec_ntlmssp_state->server_multiple_authentications) {
532                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
533         } else {
534                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
535         }
536
537         return nt_status;
538 }
539
540
541 /**
542  * Next state function for the Authenticate packet
543  * 
544  * @param gensec_security GENSEC state
545  * @param out_mem_ctx Memory context for *out
546  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
547  * @param out The reply, as an allocated DATA_BLOB, caller to free.
548  * @return Errors or NT_STATUS_OK if authentication sucessful
549  */
550
551 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security, 
552                              TALLOC_CTX *out_mem_ctx, 
553                              const DATA_BLOB in, DATA_BLOB *out) 
554 {       
555         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
556         DATA_BLOB user_session_key = data_blob(NULL, 0);
557         DATA_BLOB lm_session_key = data_blob(NULL, 0);
558         NTSTATUS nt_status;
559
560         TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
561         if (!mem_ctx) {
562                 return NT_STATUS_NO_MEMORY;
563         }
564
565         /* zero the outbound NTLMSSP packet */
566         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
567
568         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
569                 talloc_free(mem_ctx);
570                 return nt_status;
571         }
572
573         /*
574          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
575          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
576          * smb.conf file) and no NTLMv2 response was sent then the password check
577          * will fail here. JRA.
578          */
579
580         /* Finally, actually ask if the password is OK */
581
582         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,
583                                                                               &user_session_key, &lm_session_key))) {
584                 talloc_free(mem_ctx);
585                 return nt_status;
586         }
587         
588         if (gensec_security->want_features
589             & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
590                 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
591                 talloc_free(mem_ctx);
592                 return nt_status;
593         } else {
594                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
595                 talloc_free(mem_ctx);
596                 return NT_STATUS_OK;
597         }
598 }
599
600 /**
601  * Return the challenge as determined by the authentication subsystem 
602  * @return an 8 byte random challenge
603  */
604
605 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
606 {
607         NTSTATUS status;
608         const uint8_t *chal;
609
610         status = gensec_ntlmssp_state->auth_context->get_challenge(gensec_ntlmssp_state->auth_context, &chal);
611         if (!NT_STATUS_IS_OK(status)) {
612                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
613                         nt_errstr(status)));
614                 return NULL;
615         }
616
617         return chal;
618 }
619
620 /**
621  * Some authentication methods 'fix' the challenge, so we may not be able to set it
622  *
623  * @return If the effective challenge used by the auth subsystem may be modified
624  */
625 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
626 {
627         return gensec_ntlmssp_state->auth_context->challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
628 }
629
630 /**
631  * NTLM2 authentication modifies the effective challenge, 
632  * @param challenge The new challenge value
633  */
634 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
635 {
636         NTSTATUS nt_status;
637         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
638         const uint8_t *chal;
639
640         if (challenge->length != 8) {
641                 return NT_STATUS_INVALID_PARAMETER;
642         }
643
644         chal = challenge->data;
645
646         nt_status = gensec_ntlmssp_state->auth_context->set_challenge(auth_context, 
647                                                                       chal, 
648                                                                       "NTLMSSP callback (NTLM2)");
649
650         return nt_status;
651 }
652
653 /**
654  * Check the password on an NTLMSSP login.  
655  *
656  * Return the session keys used on the connection.
657  */
658
659 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state, 
660                                             TALLOC_CTX *mem_ctx, 
661                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key) 
662 {
663         NTSTATUS nt_status;
664         struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);
665         if (!user_info) {
666                 return NT_STATUS_NO_MEMORY;
667         }
668
669         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
670         user_info->flags = 0;
671         user_info->mapped_state = false;
672         user_info->client.account_name = gensec_ntlmssp_state->user;
673         user_info->client.domain_name = gensec_ntlmssp_state->domain;
674         user_info->workstation_name = gensec_ntlmssp_state->workstation;
675         user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security);
676
677         user_info->password_state = AUTH_PASSWORD_RESPONSE;
678         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
679         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
680         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
681         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
682
683         nt_status = gensec_ntlmssp_state->auth_context->check_password(gensec_ntlmssp_state->auth_context, 
684                                                                        mem_ctx,
685                                                                        user_info, 
686                                                                        &gensec_ntlmssp_state->server_info);
687         talloc_free(user_info);
688         NT_STATUS_NOT_OK_RETURN(nt_status);
689
690         talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);
691
692         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
693                 DEBUG(10, ("Got NT session key of length %u\n", 
694                            (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
695                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) {
696                         return NT_STATUS_NO_MEMORY;
697                 }
698
699                 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
700         }
701         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
702                 DEBUG(10, ("Got LM session key of length %u\n", 
703                            (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
704                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) {
705                         return NT_STATUS_NO_MEMORY;
706                 }
707
708                 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
709         }
710         return nt_status;
711 }
712
713 /** 
714  * Return the credentials of a logged on user, including session keys
715  * etc.
716  *
717  * Only valid after a successful authentication
718  *
719  * May only be called once per authentication.
720  *
721  */
722
723 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
724                                      struct auth_session_info **session_info) 
725 {
726         NTSTATUS nt_status;
727         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
728
729         nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_security->event_ctx, gensec_security->settings->lp_ctx, gensec_ntlmssp_state->server_info, session_info);
730         NT_STATUS_NOT_OK_RETURN(nt_status);
731
732         (*session_info)->session_key = data_blob_talloc(*session_info, 
733                                                         gensec_ntlmssp_state->session_key.data,
734                                                         gensec_ntlmssp_state->session_key.length);
735
736         return NT_STATUS_OK;
737 }
738
739 /**
740  * Start NTLMSSP on the server side 
741  *
742  */
743 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
744 {
745         NTSTATUS nt_status;
746         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
747
748         nt_status = gensec_ntlmssp_start(gensec_security);
749         NT_STATUS_NOT_OK_RETURN(nt_status);
750
751         gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
752
753         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
754
755         gensec_ntlmssp_state->workstation = NULL;
756         gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->settings->lp_ctx);
757
758         gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->settings->lp_ctx);
759
760         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
761
762         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->settings->lp_ctx) 
763                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
764
765         gensec_ntlmssp_state->server_multiple_authentications = false;
766         
767         gensec_ntlmssp_state->neg_flags = 
768                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_UNKNOWN_02000000;
769
770         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
771         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
772         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
773
774         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
775                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;               
776         }
777
778         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
779                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;                
780         }
781
782         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
783                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;          
784         }
785
786         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
787                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;               
788         }
789
790         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
791                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;             
792         }
793
794         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
795                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
796         }
797         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
798                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
799         }
800
801         gensec_ntlmssp_state->auth_context = gensec_security->auth_context;
802
803         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
804         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
805         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
806         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
807         gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->settings->lp_ctx);
808
809         return NT_STATUS_OK;
810 }
811