Remove auth/ntlm as a dependency of GENSEC by means of function pointers.
[samba.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 "auth/ntlmssp/msrpc_parse.h"
28 #include "../lib/crypto/crypto.h"
29 #include "libcli/auth/libcli_auth.h"
30 #include "auth/credentials/credentials.h"
31 #include "auth/gensec/gensec.h"
32 #include "auth/auth.h"
33 #include "auth/ntlm/auth_proto.h"
34 #include "param/param.h"
35 #include "auth/session_proto.h"
36
37 /** 
38  * Set a username on an NTLMSSP context - ensures it is talloc()ed 
39  *
40  */
41
42 static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user) 
43 {
44         if (!user) {
45                 /* it should be at least "" */
46                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
47                 return NT_STATUS_INVALID_PARAMETER;
48         }
49         gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user);
50         if (!gensec_ntlmssp_state->user) {
51                 return NT_STATUS_NO_MEMORY;
52         }
53         return NT_STATUS_OK;
54 }
55
56 /** 
57  * Set a domain on an NTLMSSP context - ensures it is talloc()ed 
58  *
59  */
60 static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain) 
61 {
62         gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain);
63         if (!gensec_ntlmssp_state->domain) {
64                 return NT_STATUS_NO_MEMORY;
65         }
66         return NT_STATUS_OK;
67 }
68
69 /** 
70  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed 
71  *
72  */
73 static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation) 
74 {
75         gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation);
76         if (!gensec_ntlmssp_state->workstation) {
77                 return NT_STATUS_NO_MEMORY;
78         }
79         return NT_STATUS_OK;
80 }
81
82 /**
83  * Determine correct target name flags for reply, given server role 
84  * and negotiated flags
85  * 
86  * @param gensec_ntlmssp_state NTLMSSP State
87  * @param neg_flags The flags from the packet
88  * @param chal_flags The flags to be set in the reply packet
89  * @return The 'target name' string.
90  */
91
92 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
93                                        uint32_t neg_flags, uint32_t *chal_flags) 
94 {
95         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
96                 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
97                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
98                 if (gensec_ntlmssp_state->server_role == ROLE_STANDALONE) {
99                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
100                         return gensec_ntlmssp_state->server_name;
101                 } else {
102                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
103                         return gensec_ntlmssp_state->domain;
104                 };
105         } else {
106                 return "";
107         }
108 }
109
110
111
112 /**
113  * Next state function for the Negotiate packet
114  * 
115  * @param gensec_security GENSEC state
116  * @param out_mem_ctx Memory context for *out
117  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
118  * @param out The reply, as an allocated DATA_BLOB, caller to free.
119  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required. 
120  */
121
122 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security, 
123                                   TALLOC_CTX *out_mem_ctx, 
124                                   const DATA_BLOB in, DATA_BLOB *out) 
125 {
126         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
127         DATA_BLOB struct_blob;
128         uint32_t neg_flags = 0;
129         uint32_t ntlmssp_command, chal_flags;
130         const uint8_t *cryptkey;
131         const char *target_name;
132
133         /* parse the NTLMSSP packet */
134 #if 0
135         file_save("ntlmssp_negotiate.dat", request.data, request.length);
136 #endif
137
138         if (in.length) {
139                 if ((in.length < 16) || !msrpc_parse(out_mem_ctx, 
140                                                          &in, "Cdd",
141                                                          "NTLMSSP",
142                                                          &ntlmssp_command,
143                                                          &neg_flags)) {
144                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
145                                 "NTLMSSP Negotiate of length %u:\n",
146                                 (unsigned int)in.length ));
147                         dump_data(2, in.data, in.length);
148                         return NT_STATUS_INVALID_PARAMETER;
149                 }
150                 debug_ntlmssp_flags(neg_flags);
151         }
152         
153         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
154
155         /* Ask our caller what challenge they would like in the packet */
156         cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state);
157         if (!cryptkey) {
158                 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
159                 return NT_STATUS_INTERNAL_ERROR;
160         }
161
162         /* Check if we may set the challenge */
163         if (!gensec_ntlmssp_state->may_set_challenge(gensec_ntlmssp_state)) {
164                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
165         }
166
167         /* The flags we send back are not just the negotiated flags,
168          * they are also 'what is in this packet'.  Therfore, we
169          * operate on 'chal_flags' from here on 
170          */
171
172         chal_flags = gensec_ntlmssp_state->neg_flags;
173
174         /* get the right name to fill in as 'target' */
175         target_name = ntlmssp_target_name(gensec_ntlmssp_state, 
176                                           neg_flags, &chal_flags); 
177         if (target_name == NULL) 
178                 return NT_STATUS_INVALID_PARAMETER;
179
180         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
181         gensec_ntlmssp_state->internal_chal = data_blob_talloc(gensec_ntlmssp_state, cryptkey, 8);
182
183         /* This creates the 'blob' of names that appears at the end of the packet */
184         if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
185                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
186                 const char *target_name_dns = "";
187
188                 /* Find out the DNS domain name */
189                 dnsdomname[0] = '\0';
190                 safe_strcpy(dnsdomname, lp_realm(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1);
191                 strlower_m(dnsdomname);
192
193                 /* Find out the DNS host name */
194                 safe_strcpy(dnsname, gensec_ntlmssp_state->server_name, sizeof(dnsname) - 1);
195                 if (dnsdomname[0] != '\0') {
196                         safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
197                         safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
198                 }
199                 strlower_m(dnsname);
200
201                 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
202                         target_name_dns = dnsdomname;
203                 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
204                         target_name_dns = dnsname;
205                 }
206
207                 msrpc_gen(out_mem_ctx, 
208                           &struct_blob, "aaaaa",
209                           NTLMSSP_NAME_TYPE_DOMAIN, target_name,
210                           NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name,
211                           NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
212                           NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
213                           0, "");
214         } else {
215                 struct_blob = data_blob(NULL, 0);
216         }
217
218         {
219                 /* Marshal the packet in the right format, be it unicode or ASCII */
220                 const char *gen_string;
221                 if (gensec_ntlmssp_state->unicode) {
222                         gen_string = "CdUdbddB";
223                 } else {
224                         gen_string = "CdAdbddB";
225                 }
226                 
227                 msrpc_gen(out_mem_ctx, 
228                           out, gen_string,
229                           "NTLMSSP", 
230                           NTLMSSP_CHALLENGE,
231                           target_name,
232                           chal_flags,
233                           cryptkey, 8,
234                           0, 0,
235                           struct_blob.data, struct_blob.length);
236         }
237                 
238         gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
239
240         return NT_STATUS_MORE_PROCESSING_REQUIRED;
241 }
242
243 /**
244  * Next state function for the Authenticate packet
245  * 
246  * @param gensec_ntlmssp_state NTLMSSP State
247  * @param request The request, as a DATA_BLOB
248  * @return Errors or NT_STATUS_OK. 
249  */
250
251 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
252                                        const DATA_BLOB request) 
253 {
254         uint32_t ntlmssp_command, auth_flags;
255         NTSTATUS nt_status;
256
257         uint8_t session_nonce_hash[16];
258
259         const char *parse_string;
260         char *domain = NULL;
261         char *user = NULL;
262         char *workstation = NULL;
263
264 #if 0
265         file_save("ntlmssp_auth.dat", request.data, request.length);
266 #endif
267
268         if (gensec_ntlmssp_state->unicode) {
269                 parse_string = "CdBBUUUBd";
270         } else {
271                 parse_string = "CdBBAAABd";
272         }
273
274         /* zero these out */
275         data_blob_free(&gensec_ntlmssp_state->lm_resp);
276         data_blob_free(&gensec_ntlmssp_state->nt_resp);
277         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
278
279         gensec_ntlmssp_state->user = NULL;
280         gensec_ntlmssp_state->domain = NULL;
281         gensec_ntlmssp_state->workstation = NULL;
282
283         /* now the NTLMSSP encoded auth hashes */
284         if (!msrpc_parse(gensec_ntlmssp_state, 
285                          &request, parse_string,
286                          "NTLMSSP", 
287                          &ntlmssp_command, 
288                          &gensec_ntlmssp_state->lm_resp,
289                          &gensec_ntlmssp_state->nt_resp,
290                          &domain, 
291                          &user, 
292                          &workstation,
293                          &gensec_ntlmssp_state->encrypted_session_key,
294                          &auth_flags)) {
295                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
296                 dump_data(10, request.data, request.length);
297
298                 /* zero this out */
299                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
300                 auth_flags = 0;
301                 
302                 /* Try again with a shorter string (Win9X truncates this packet) */
303                 if (gensec_ntlmssp_state->unicode) {
304                         parse_string = "CdBBUUU";
305                 } else {
306                         parse_string = "CdBBAAA";
307                 }
308
309                 /* now the NTLMSSP encoded auth hashes */
310                 if (!msrpc_parse(gensec_ntlmssp_state, 
311                                  &request, parse_string,
312                                  "NTLMSSP", 
313                                  &ntlmssp_command, 
314                                  &gensec_ntlmssp_state->lm_resp,
315                                  &gensec_ntlmssp_state->nt_resp,
316                                  &domain, 
317                                  &user, 
318                                  &workstation)) {
319                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
320                         dump_data(2, request.data, request.length);
321
322                         return NT_STATUS_INVALID_PARAMETER;
323                 }
324         }
325
326         if (auth_flags)
327                 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
328
329         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
330                 /* zero this out */
331                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
332                 return nt_status;
333         }
334
335         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
336                 /* zero this out */
337                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
338                 return nt_status;
339         }
340
341         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
342                 /* zero this out */
343                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
344                 return nt_status;
345         }
346
347         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
348                  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));
349
350 #if 0
351         file_save("nthash1.dat",  &gensec_ntlmssp_state->nt_resp.data,  &gensec_ntlmssp_state->nt_resp.length);
352         file_save("lmhash1.dat",  &gensec_ntlmssp_state->lm_resp.data,  &gensec_ntlmssp_state->lm_resp.length);
353 #endif
354
355         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a 
356            client challenge 
357         
358            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
359         */
360         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
361                 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
362                         struct MD5Context md5_session_nonce_ctx;
363                         SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data 
364                                    && gensec_ntlmssp_state->internal_chal.length == 8);
365                         
366                         gensec_ntlmssp_state->doing_ntlm2 = true;
367
368                         memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
369                         memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
370                         
371                         MD5Init(&md5_session_nonce_ctx);
372                         MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
373                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
374                         
375                         gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state, 
376                                                                session_nonce_hash, 8);
377
378                         /* LM response is no longer useful, zero it out */
379                         data_blob_free(&gensec_ntlmssp_state->lm_resp);
380
381                         /* We changed the effective challenge - set it */
382                         if (!NT_STATUS_IS_OK(nt_status = 
383                                              gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state, 
384                                                                                  &gensec_ntlmssp_state->chal))) {
385                                 /* zero this out */
386                                 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
387                                 return nt_status;
388                         }
389
390                         /* LM Key is incompatible... */
391                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
392                 }
393         }
394         return NT_STATUS_OK;
395 }
396
397 /**
398  * Next state function for the Authenticate packet 
399  * (after authentication - figures out the session keys etc)
400  * 
401  * @param gensec_ntlmssp_state NTLMSSP State
402  * @return Errors or NT_STATUS_OK. 
403  */
404
405 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security, 
406                                         DATA_BLOB *user_session_key, 
407                                         DATA_BLOB *lm_session_key) 
408 {
409         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
410         NTSTATUS nt_status;
411         DATA_BLOB session_key = data_blob(NULL, 0);
412
413         if (user_session_key)
414                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
415
416         if (lm_session_key) 
417                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
418
419         /* Handle the different session key derivation for NTLM2 */
420         if (gensec_ntlmssp_state->doing_ntlm2) {
421                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
422                         session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
423                         hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 
424                                  sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
425                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
426                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
427                         
428                 } else {
429                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
430                         session_key = data_blob(NULL, 0);
431                 }
432         } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) 
433                 /* Ensure we can never get here on NTLMv2 */
434                 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
435
436                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
437                         if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
438                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
439                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data, 
440                                                           session_key.data);
441                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
442                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
443                         } else {
444                                 
445                                 /* When there is no LM response, just use zeros */
446                                 static const uint8_t zeros[24];
447                                 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
448                                 SMBsesskeygen_lm_sess_key(zeros, zeros, 
449                                                           session_key.data);
450                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
451                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
452                         }
453                 } else {
454                         /* LM Key not selected */
455                         gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
456
457                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
458                         session_key = data_blob(NULL, 0);
459                 }
460
461         } else if (user_session_key && user_session_key->data) {
462                 session_key = *user_session_key;
463                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
464                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
465
466                 /* LM Key not selected */
467                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
468
469         } else if (lm_session_key && lm_session_key->data) {
470                 /* Very weird to have LM key, but no user session key, but anyway.. */
471                 session_key = *lm_session_key;
472                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
473                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
474
475                 /* LM Key not selected */
476                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
477
478         } else {
479                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
480                 session_key = data_blob(NULL, 0);
481
482                 /* LM Key not selected */
483                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
484         }
485
486         /* With KEY_EXCH, the client supplies the proposed session key, 
487            but encrypts it with the long-term key */
488         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
489                 if (!gensec_ntlmssp_state->encrypted_session_key.data 
490                     || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
491                         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
492                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n", 
493                                   (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
494                         return NT_STATUS_INVALID_PARAMETER;
495                 } else if (!session_key.data || session_key.length != 16) {
496                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n", 
497                                   (unsigned)session_key.length));
498                         gensec_ntlmssp_state->session_key = session_key;
499                 } else {
500                         dump_data_pw("KEY_EXCH session key (enc):\n", 
501                                      gensec_ntlmssp_state->encrypted_session_key.data, 
502                                      gensec_ntlmssp_state->encrypted_session_key.length);
503                         arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data, 
504                                       session_key.data, 
505                                       gensec_ntlmssp_state->encrypted_session_key.length);
506                         gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state, 
507                                                                       gensec_ntlmssp_state->encrypted_session_key.data, 
508                                                                       gensec_ntlmssp_state->encrypted_session_key.length);
509                         dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data, 
510                                      gensec_ntlmssp_state->encrypted_session_key.length);
511                 }
512         } else {
513                 gensec_ntlmssp_state->session_key = session_key;
514         }
515
516         /* keep the session key around on the new context */
517         talloc_steal(gensec_ntlmssp_state, session_key.data);
518
519         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
520             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
521                 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
522         } else {
523                 nt_status = NT_STATUS_OK;
524         }
525
526         data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
527         
528         /* allow arbitarily many authentications, but watch that this will cause a 
529            memory leak, until the gensec_ntlmssp_state is shutdown 
530         */
531
532         if (gensec_ntlmssp_state->server_multiple_authentications) {
533                 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
534         } else {
535                 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
536         }
537
538         return nt_status;
539 }
540
541
542 /**
543  * Next state function for the Authenticate packet
544  * 
545  * @param gensec_security GENSEC state
546  * @param out_mem_ctx Memory context for *out
547  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
548  * @param out The reply, as an allocated DATA_BLOB, caller to free.
549  * @return Errors or NT_STATUS_OK if authentication sucessful
550  */
551
552 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security, 
553                              TALLOC_CTX *out_mem_ctx, 
554                              const DATA_BLOB in, DATA_BLOB *out) 
555 {       
556         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
557         DATA_BLOB user_session_key = data_blob(NULL, 0);
558         DATA_BLOB lm_session_key = data_blob(NULL, 0);
559         NTSTATUS nt_status;
560
561         TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
562         if (!mem_ctx) {
563                 return NT_STATUS_NO_MEMORY;
564         }
565
566         /* zero the outbound NTLMSSP packet */
567         *out = data_blob_talloc(out_mem_ctx, NULL, 0);
568
569         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
570                 talloc_free(mem_ctx);
571                 return nt_status;
572         }
573
574         /*
575          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
576          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
577          * smb.conf file) and no NTLMv2 response was sent then the password check
578          * will fail here. JRA.
579          */
580
581         /* Finally, actually ask if the password is OK */
582
583         if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,
584                                                                               &user_session_key, &lm_session_key))) {
585                 talloc_free(mem_ctx);
586                 return nt_status;
587         }
588         
589         if (gensec_security->want_features
590             & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
591                 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
592                 talloc_free(mem_ctx);
593                 return nt_status;
594         } else {
595                 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
596                 talloc_free(mem_ctx);
597                 return NT_STATUS_OK;
598         }
599 }
600
601 /**
602  * Return the challenge as determined by the authentication subsystem 
603  * @return an 8 byte random challenge
604  */
605
606 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
607 {
608         NTSTATUS status;
609         const uint8_t *chal;
610
611         status = gensec_ntlmssp_state->auth_context->get_challenge(gensec_ntlmssp_state->auth_context, &chal);
612         if (!NT_STATUS_IS_OK(status)) {
613                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
614                         nt_errstr(status)));
615                 return NULL;
616         }
617
618         return chal;
619 }
620
621 /**
622  * Some authentication methods 'fix' the challenge, so we may not be able to set it
623  *
624  * @return If the effective challenge used by the auth subsystem may be modified
625  */
626 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
627 {
628         return gensec_ntlmssp_state->auth_context->challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
629 }
630
631 /**
632  * NTLM2 authentication modifies the effective challenge, 
633  * @param challenge The new challenge value
634  */
635 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
636 {
637         NTSTATUS nt_status;
638         struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
639         const uint8_t *chal;
640
641         if (challenge->length != 8) {
642                 return NT_STATUS_INVALID_PARAMETER;
643         }
644
645         chal = challenge->data;
646
647         nt_status = gensec_ntlmssp_state->auth_context->set_challenge(auth_context, 
648                                                                       chal, 
649                                                                       "NTLMSSP callback (NTLM2)");
650
651         return nt_status;
652 }
653
654 /**
655  * Check the password on an NTLMSSP login.  
656  *
657  * Return the session keys used on the connection.
658  */
659
660 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state, 
661                                             TALLOC_CTX *mem_ctx, 
662                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key) 
663 {
664         NTSTATUS nt_status;
665         struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);
666         if (!user_info) {
667                 return NT_STATUS_NO_MEMORY;
668         }
669
670         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
671         user_info->flags = 0;
672         user_info->mapped_state = false;
673         user_info->client.account_name = gensec_ntlmssp_state->user;
674         user_info->client.domain_name = gensec_ntlmssp_state->domain;
675         user_info->workstation_name = gensec_ntlmssp_state->workstation;
676         user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security);
677
678         user_info->password_state = AUTH_PASSWORD_RESPONSE;
679         user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
680         user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
681         user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
682         user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
683
684         nt_status = gensec_ntlmssp_state->auth_context->check_password(gensec_ntlmssp_state->auth_context, 
685                                                                        mem_ctx,
686                                                                        user_info, 
687                                                                        &gensec_ntlmssp_state->server_info);
688         talloc_free(user_info);
689         NT_STATUS_NOT_OK_RETURN(nt_status);
690
691         talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);
692
693         if (gensec_ntlmssp_state->server_info->user_session_key.length) {
694                 DEBUG(10, ("Got NT session key of length %u\n", 
695                            (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
696                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) {
697                         return NT_STATUS_NO_MEMORY;
698                 }
699
700                 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
701         }
702         if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
703                 DEBUG(10, ("Got LM session key of length %u\n", 
704                            (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
705                 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) {
706                         return NT_STATUS_NO_MEMORY;
707                 }
708
709                 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
710         }
711         return nt_status;
712 }
713
714 /** 
715  * Return the credentials of a logged on user, including session keys
716  * etc.
717  *
718  * Only valid after a successful authentication
719  *
720  * May only be called once per authentication.
721  *
722  */
723
724 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
725                                      struct auth_session_info **session_info) 
726 {
727         NTSTATUS nt_status;
728         struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
729
730         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);
731         NT_STATUS_NOT_OK_RETURN(nt_status);
732
733         (*session_info)->session_key = data_blob_talloc(*session_info, 
734                                                         gensec_ntlmssp_state->session_key.data,
735                                                         gensec_ntlmssp_state->session_key.length);
736
737         return NT_STATUS_OK;
738 }
739
740 /**
741  * Start NTLMSSP on the server side 
742  *
743  */
744 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
745 {
746         NTSTATUS nt_status;
747         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
748
749         nt_status = gensec_ntlmssp_start(gensec_security);
750         NT_STATUS_NOT_OK_RETURN(nt_status);
751
752         gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
753
754         gensec_ntlmssp_state->role = NTLMSSP_SERVER;
755
756         gensec_ntlmssp_state->workstation = NULL;
757         gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->settings->lp_ctx);
758
759         gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->settings->lp_ctx);
760
761         gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
762
763         gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->settings->lp_ctx) 
764                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
765
766         gensec_ntlmssp_state->server_multiple_authentications = false;
767         
768         gensec_ntlmssp_state->neg_flags = 
769                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_UNKNOWN_02000000;
770
771         gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
772         gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
773         gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
774
775         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
776                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;               
777         }
778
779         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
780                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;                
781         }
782
783         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
784                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;          
785         }
786
787         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
788                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;               
789         }
790
791         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
792                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;             
793         }
794
795         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
796                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
797         }
798         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
799                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
800         }
801
802         gensec_ntlmssp_state->auth_context = gensec_security->auth_context;
803
804         gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
805         gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
806         gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
807         gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
808         gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->settings->lp_ctx);
809
810         return NT_STATUS_OK;
811 }
812