source: branches/samba-3.5.x/source3/libsmb/ntlmssp.c@ 850

Last change on this file since 850 was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 39.7 KB
Line 
1/*
2 Unix SMB/Netbios implementation.
3 Version 3.0
4 handle NLTMSSP, server side
5
6 Copyright (C) Andrew Tridgell 2001
7 Copyright (C) Andrew Bartlett 2001-2003
8 Copyright (C) Andrew Bartlett 2005 (Updated from gensec).
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 "../libcli/auth/libcli_auth.h"
26#include "../librpc/gen_ndr/ndr_ntlmssp.h"
27#include "libsmb/ntlmssp_ndr.h"
28
29static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
30 DATA_BLOB reply, DATA_BLOB *next_request);
31static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
32 const DATA_BLOB in, DATA_BLOB *out);
33static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
34 const DATA_BLOB reply, DATA_BLOB *next_request);
35static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
36 const DATA_BLOB request, DATA_BLOB *reply);
37
38/**
39 * Callbacks for NTLMSSP - for both client and server operating modes
40 *
41 */
42
43static const struct ntlmssp_callbacks {
44 enum NTLMSSP_ROLE role;
45 enum NTLM_MESSAGE_TYPE ntlmssp_command;
46 NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
47 DATA_BLOB in, DATA_BLOB *out);
48} ntlmssp_callbacks[] = {
49 {NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
50 {NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
51 {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
52 {NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
53 {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
54 {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
55};
56
57
58/**
59 * Print out the NTLMSSP flags for debugging
60 * @param neg_flags The flags from the packet
61 */
62
63void debug_ntlmssp_flags(uint32 neg_flags)
64{
65 DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
66
67 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
68 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_UNICODE\n"));
69 if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
70 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM\n"));
71 if (neg_flags & NTLMSSP_REQUEST_TARGET)
72 DEBUGADD(4, (" NTLMSSP_REQUEST_TARGET\n"));
73 if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
74 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SIGN\n"));
75 if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
76 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SEAL\n"));
77 if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM)
78 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_DATAGRAM\n"));
79 if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
80 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_LM_KEY\n"));
81 if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
82 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NETWARE\n"));
83 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
84 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM\n"));
85 if (neg_flags & NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED)
86 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED\n"));
87 if (neg_flags & NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED)
88 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED\n"));
89 if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
90 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
91 if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
92 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
93 if (neg_flags & NTLMSSP_REQUEST_NON_NT_SESSION_KEY)
94 DEBUGADD(4, (" NTLMSSP_REQUEST_NON_NT_SESSION_KEY\n"));
95 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
96 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM2\n"));
97 if (neg_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
98 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_TARGET_INFO\n"));
99 if (neg_flags & NTLMSSP_NEGOTIATE_VERSION)
100 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_VERSION\n"));
101 if (neg_flags & NTLMSSP_NEGOTIATE_128)
102 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_128\n"));
103 if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
104 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
105 if (neg_flags & NTLMSSP_NEGOTIATE_56)
106 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_56\n"));
107}
108
109/**
110 * Default challenge generation code.
111 *
112 */
113
114static void get_challenge(const struct ntlmssp_state *ntlmssp_state,
115 uint8_t chal[8])
116{
117 generate_random_buffer(chal, 8);
118}
119
120/**
121 * Default 'we can set the challenge to anything we like' implementation
122 *
123 */
124
125static bool may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
126{
127 return True;
128}
129
130/**
131 * Default 'we can set the challenge to anything we like' implementation
132 *
133 * Does not actually do anything, as the value is always in the structure anyway.
134 *
135 */
136
137static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
138{
139 SMB_ASSERT(challenge->length == 8);
140 return NT_STATUS_OK;
141}
142
143/**
144 * Set a username on an NTLMSSP context - ensures it is talloc()ed
145 *
146 */
147
148NTSTATUS ntlmssp_set_username(NTLMSSP_STATE *ntlmssp_state, const char *user)
149{
150 ntlmssp_state->user = talloc_strdup(ntlmssp_state, user ? user : "" );
151 if (!ntlmssp_state->user) {
152 return NT_STATUS_NO_MEMORY;
153 }
154 return NT_STATUS_OK;
155}
156
157/**
158 * Store NT and LM hashes on an NTLMSSP context - ensures they are talloc()ed
159 *
160 */
161NTSTATUS ntlmssp_set_hashes(NTLMSSP_STATE *ntlmssp_state,
162 const unsigned char lm_hash[16],
163 const unsigned char nt_hash[16])
164{
165 ntlmssp_state->lm_hash = (unsigned char *)
166 TALLOC_MEMDUP(ntlmssp_state, lm_hash, 16);
167 ntlmssp_state->nt_hash = (unsigned char *)
168 TALLOC_MEMDUP(ntlmssp_state, nt_hash, 16);
169 if (!ntlmssp_state->lm_hash || !ntlmssp_state->nt_hash) {
170 TALLOC_FREE(ntlmssp_state->lm_hash);
171 TALLOC_FREE(ntlmssp_state->nt_hash);
172 return NT_STATUS_NO_MEMORY;
173 }
174 return NT_STATUS_OK;
175}
176
177/**
178 * Converts a password to the hashes on an NTLMSSP context.
179 *
180 */
181NTSTATUS ntlmssp_set_password(NTLMSSP_STATE *ntlmssp_state, const char *password)
182{
183 if (!password) {
184 ntlmssp_state->lm_hash = NULL;
185 ntlmssp_state->nt_hash = NULL;
186 } else {
187 unsigned char lm_hash[16];
188 unsigned char nt_hash[16];
189
190 E_deshash(password, lm_hash);
191 E_md4hash(password, nt_hash);
192 return ntlmssp_set_hashes(ntlmssp_state, lm_hash, nt_hash);
193 }
194 return NT_STATUS_OK;
195}
196
197/**
198 * Set a domain on an NTLMSSP context - ensures it is talloc()ed
199 *
200 */
201NTSTATUS ntlmssp_set_domain(NTLMSSP_STATE *ntlmssp_state, const char *domain)
202{
203 ntlmssp_state->domain = talloc_strdup(ntlmssp_state,
204 domain ? domain : "" );
205 if (!ntlmssp_state->domain) {
206 return NT_STATUS_NO_MEMORY;
207 }
208 return NT_STATUS_OK;
209}
210
211/**
212 * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
213 *
214 */
215NTSTATUS ntlmssp_set_workstation(NTLMSSP_STATE *ntlmssp_state, const char *workstation)
216{
217 ntlmssp_state->workstation = talloc_strdup(ntlmssp_state, workstation);
218 if (!ntlmssp_state->workstation) {
219 return NT_STATUS_NO_MEMORY;
220 }
221 return NT_STATUS_OK;
222}
223
224/**
225 * Store a DATA_BLOB containing an NTLMSSP response, for use later.
226 * This copies the data blob
227 */
228
229NTSTATUS ntlmssp_store_response(NTLMSSP_STATE *ntlmssp_state,
230 DATA_BLOB response)
231{
232 ntlmssp_state->stored_response = data_blob_talloc(ntlmssp_state,
233 response.data,
234 response.length);
235 return NT_STATUS_OK;
236}
237
238/**
239 * Request features for the NTLMSSP negotiation
240 *
241 * @param ntlmssp_state NTLMSSP state
242 * @param feature_list List of space seperated features requested from NTLMSSP.
243 */
244void ntlmssp_want_feature_list(NTLMSSP_STATE *ntlmssp_state, char *feature_list)
245{
246 /*
247 * We need to set this to allow a later SetPassword
248 * via the SAMR pipe to succeed. Strange.... We could
249 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
250 */
251 if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
252 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
253 }
254 if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
255 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
256 }
257 if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
258 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
259 }
260 if (in_list("NTLMSSP_FEATURE_CCACHE", feature_list, true)) {
261 ntlmssp_state->use_ccache = true;
262 }
263}
264
265/**
266 * Request a feature for the NTLMSSP negotiation
267 *
268 * @param ntlmssp_state NTLMSSP state
269 * @param feature Bit flag specifying the requested feature
270 */
271void ntlmssp_want_feature(NTLMSSP_STATE *ntlmssp_state, uint32 feature)
272{
273 /* As per JRA's comment above */
274 if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
275 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
276 }
277 if (feature & NTLMSSP_FEATURE_SIGN) {
278 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
279 }
280 if (feature & NTLMSSP_FEATURE_SEAL) {
281 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
282 }
283 if (feature & NTLMSSP_FEATURE_CCACHE) {
284 ntlmssp_state->use_ccache = true;
285 }
286}
287
288/**
289 * Next state function for the NTLMSSP state machine
290 *
291 * @param ntlmssp_state NTLMSSP State
292 * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
293 * @param out The reply, as an allocated DATA_BLOB, caller to free.
294 * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
295 */
296
297NTSTATUS ntlmssp_update(NTLMSSP_STATE *ntlmssp_state,
298 const DATA_BLOB in, DATA_BLOB *out)
299{
300 DATA_BLOB input;
301 uint32 ntlmssp_command;
302 int i;
303
304 if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
305 /* Called update after negotiations finished. */
306 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
307 return NT_STATUS_INVALID_PARAMETER;
308 }
309
310 *out = data_blob_null;
311
312 if (!in.length && ntlmssp_state->stored_response.length) {
313 input = ntlmssp_state->stored_response;
314
315 /* we only want to read the stored response once - overwrite it */
316 ntlmssp_state->stored_response = data_blob_null;
317 } else {
318 input = in;
319 }
320
321 if (!input.length) {
322 switch (ntlmssp_state->role) {
323 case NTLMSSP_CLIENT:
324 ntlmssp_command = NTLMSSP_INITIAL;
325 break;
326 case NTLMSSP_SERVER:
327 /* 'datagram' mode - no neg packet */
328 ntlmssp_command = NTLMSSP_NEGOTIATE;
329 break;
330 }
331 } else {
332 if (!msrpc_parse(ntlmssp_state, &input, "Cd",
333 "NTLMSSP",
334 &ntlmssp_command)) {
335 DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
336 dump_data(2, input.data, input.length);
337 return NT_STATUS_INVALID_PARAMETER;
338 }
339 }
340
341 if (ntlmssp_command != ntlmssp_state->expected_state) {
342 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
343 return NT_STATUS_INVALID_PARAMETER;
344 }
345
346 for (i=0; ntlmssp_callbacks[i].fn; i++) {
347 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
348 && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
349 return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
350 }
351 }
352
353 DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
354 ntlmssp_state->role, ntlmssp_command));
355
356 return NT_STATUS_INVALID_PARAMETER;
357}
358
359/**
360 * End an NTLMSSP state machine
361 *
362 * @param ntlmssp_state NTLMSSP State, free()ed by this function
363 */
364
365void ntlmssp_end(NTLMSSP_STATE **ntlmssp_state)
366{
367 (*ntlmssp_state)->ref_count--;
368
369 if ((*ntlmssp_state)->ref_count == 0) {
370 data_blob_free(&(*ntlmssp_state)->chal);
371 data_blob_free(&(*ntlmssp_state)->lm_resp);
372 data_blob_free(&(*ntlmssp_state)->nt_resp);
373 TALLOC_FREE(*ntlmssp_state);
374 }
375
376 *ntlmssp_state = NULL;
377 return;
378}
379
380/**
381 * Determine correct target name flags for reply, given server role
382 * and negotiated flags
383 *
384 * @param ntlmssp_state NTLMSSP State
385 * @param neg_flags The flags from the packet
386 * @param chal_flags The flags to be set in the reply packet
387 * @return The 'target name' string.
388 */
389
390static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
391 uint32 neg_flags, uint32 *chal_flags)
392{
393 if (neg_flags & NTLMSSP_REQUEST_TARGET) {
394 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
395 *chal_flags |= NTLMSSP_REQUEST_TARGET;
396 if (ntlmssp_state->server_role == ROLE_STANDALONE) {
397 *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
398 return ntlmssp_state->get_global_myname();
399 } else {
400 *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
401 return ntlmssp_state->get_domain();
402 };
403 } else {
404 return "";
405 }
406}
407
408static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
409 uint32 neg_flags, bool allow_lm) {
410 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
411 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
412 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
413 ntlmssp_state->unicode = True;
414 } else {
415 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
416 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
417 ntlmssp_state->unicode = False;
418 }
419
420 if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
421 /* other end forcing us to use LM */
422 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
423 ntlmssp_state->use_ntlmv2 = False;
424 } else {
425 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
426 }
427
428 if (!(neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
429 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
430 }
431
432 if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
433 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
434 }
435
436 if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
437 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
438 }
439
440 if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
441 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
442 }
443
444 if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
445 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
446 }
447
448 if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
449 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
450 }
451
452 if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
453 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
454 }
455
456 /* Woop Woop - unknown flag for Windows compatibility...
457 What does this really do ? JRA. */
458 if (!(neg_flags & NTLMSSP_NEGOTIATE_VERSION)) {
459 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_VERSION;
460 }
461
462 if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
463 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
464 }
465}
466
467/**
468 Weaken NTLMSSP keys to cope with down-level clients and servers.
469
470 We probably should have some parameters to control this, but as
471 it only occours for LM_KEY connections, and this is controlled
472 by the client lanman auth/lanman auth parameters, it isn't too bad.
473*/
474
475DATA_BLOB ntlmssp_weaken_keys(NTLMSSP_STATE *ntlmssp_state, TALLOC_CTX *mem_ctx)
476{
477 DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
478 ntlmssp_state->session_key.data,
479 ntlmssp_state->session_key.length);
480
481 /* Nothing to weaken. We certainly don't want to 'extend' the length... */
482 if (weakened_key.length < 16) {
483 /* perhaps there was no key? */
484 return weakened_key;
485 }
486
487 /* Key weakening not performed on the master key for NTLM2
488 and does not occour for NTLM1. Therefore we only need
489 to do this for the LM_KEY.
490 */
491
492 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
493 /* LM key doesn't support 128 bit crypto, so this is
494 * the best we can do. If you negotiate 128 bit, but
495 * not 56, you end up with 40 bit... */
496 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
497 weakened_key.data[7] = 0xa0;
498 } else { /* forty bits */
499 weakened_key.data[5] = 0xe5;
500 weakened_key.data[6] = 0x38;
501 weakened_key.data[7] = 0xb0;
502 }
503 weakened_key.length = 8;
504 }
505 return weakened_key;
506}
507
508/**
509 * Next state function for the Negotiate packet
510 *
511 * @param ntlmssp_state NTLMSSP State
512 * @param request The request, as a DATA_BLOB
513 * @param request The reply, as an allocated DATA_BLOB, caller to free.
514 * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
515 */
516
517static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
518 const DATA_BLOB request, DATA_BLOB *reply)
519{
520 DATA_BLOB struct_blob;
521 const char *dnsname;
522 char *dnsdomname = NULL;
523 uint32 neg_flags = 0;
524 uint32 ntlmssp_command, chal_flags;
525 uint8_t cryptkey[8];
526 const char *target_name;
527 struct NEGOTIATE_MESSAGE negotiate;
528 struct CHALLENGE_MESSAGE challenge;
529
530 /* parse the NTLMSSP packet */
531#if 0
532 file_save("ntlmssp_negotiate.dat", request.data, request.length);
533#endif
534
535 if (request.length) {
536 if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
537 "NTLMSSP",
538 &ntlmssp_command,
539 &neg_flags)) {
540 DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
541 (unsigned int)request.length));
542 dump_data(2, request.data, request.length);
543 return NT_STATUS_INVALID_PARAMETER;
544 }
545 debug_ntlmssp_flags(neg_flags);
546
547 if (DEBUGLEVEL >= 10) {
548 if (NT_STATUS_IS_OK(ntlmssp_pull_NEGOTIATE_MESSAGE(&request,
549 ntlmssp_state,
550 NULL,
551 &negotiate)))
552 {
553 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, &negotiate);
554 }
555 }
556 }
557
558 ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
559
560 /* Ask our caller what challenge they would like in the packet */
561 ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
562
563 /* Check if we may set the challenge */
564 if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
565 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
566 }
567
568 /* The flags we send back are not just the negotiated flags,
569 * they are also 'what is in this packet'. Therfore, we
570 * operate on 'chal_flags' from here on
571 */
572
573 chal_flags = ntlmssp_state->neg_flags;
574
575 /* get the right name to fill in as 'target' */
576 target_name = ntlmssp_target_name(ntlmssp_state,
577 neg_flags, &chal_flags);
578 if (target_name == NULL)
579 return NT_STATUS_INVALID_PARAMETER;
580
581 ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
582 ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
583 cryptkey, 8);
584
585 /* This should be a 'netbios domain -> DNS domain' mapping */
586 dnsdomname = get_mydnsdomname(ntlmssp_state);
587 if (!dnsdomname) {
588 dnsdomname = talloc_strdup(ntlmssp_state, "");
589 }
590 if (!dnsdomname) {
591 return NT_STATUS_NO_MEMORY;
592 }
593 strlower_m(dnsdomname);
594
595 dnsname = get_mydnsfullname();
596 if (!dnsname) {
597 dnsname = "";
598 }
599
600 /* This creates the 'blob' of names that appears at the end of the packet */
601 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
602 {
603 msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
604 MsvAvNbDomainName, target_name,
605 MsvAvNbComputerName, ntlmssp_state->get_global_myname(),
606 MsvAvDnsDomainName, dnsdomname,
607 MsvAvDnsComputerName, dnsname,
608 MsvAvEOL, "");
609 } else {
610 struct_blob = data_blob_null;
611 }
612
613 {
614 /* Marshel the packet in the right format, be it unicode or ASCII */
615 const char *gen_string;
616 if (ntlmssp_state->unicode) {
617 gen_string = "CdUdbddB";
618 } else {
619 gen_string = "CdAdbddB";
620 }
621
622 msrpc_gen(ntlmssp_state, reply, gen_string,
623 "NTLMSSP",
624 NTLMSSP_CHALLENGE,
625 target_name,
626 chal_flags,
627 cryptkey, 8,
628 0, 0,
629 struct_blob.data, struct_blob.length);
630
631 if (DEBUGLEVEL >= 10) {
632 if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(reply,
633 ntlmssp_state,
634 NULL,
635 &challenge)))
636 {
637 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
638 }
639 }
640 }
641
642 data_blob_free(&struct_blob);
643
644 ntlmssp_state->expected_state = NTLMSSP_AUTH;
645
646 return NT_STATUS_MORE_PROCESSING_REQUIRED;
647}
648
649/**
650 * Next state function for the Authenticate packet
651 *
652 * @param ntlmssp_state NTLMSSP State
653 * @param request The request, as a DATA_BLOB
654 * @param request The reply, as an allocated DATA_BLOB, caller to free.
655 * @return Errors or NT_STATUS_OK.
656 */
657
658static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
659 const DATA_BLOB request, DATA_BLOB *reply)
660{
661 DATA_BLOB encrypted_session_key = data_blob_null;
662 DATA_BLOB user_session_key = data_blob_null;
663 DATA_BLOB lm_session_key = data_blob_null;
664 DATA_BLOB session_key = data_blob_null;
665 uint32 ntlmssp_command, auth_flags;
666 NTSTATUS nt_status = NT_STATUS_OK;
667 struct AUTHENTICATE_MESSAGE authenticate;
668
669 /* used by NTLM2 */
670 bool doing_ntlm2 = False;
671
672 uchar session_nonce[16];
673 uchar session_nonce_hash[16];
674
675 const char *parse_string;
676
677 /* parse the NTLMSSP packet */
678 *reply = data_blob_null;
679
680#if 0
681 file_save("ntlmssp_auth.dat", request.data, request.length);
682#endif
683
684 if (ntlmssp_state->unicode) {
685 parse_string = "CdBBUUUBd";
686 } else {
687 parse_string = "CdBBAAABd";
688 }
689
690 data_blob_free(&ntlmssp_state->lm_resp);
691 data_blob_free(&ntlmssp_state->nt_resp);
692
693 ntlmssp_state->user = NULL;
694 ntlmssp_state->domain = NULL;
695 ntlmssp_state->workstation = NULL;
696
697 /* now the NTLMSSP encoded auth hashes */
698 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
699 "NTLMSSP",
700 &ntlmssp_command,
701 &ntlmssp_state->lm_resp,
702 &ntlmssp_state->nt_resp,
703 &ntlmssp_state->domain,
704 &ntlmssp_state->user,
705 &ntlmssp_state->workstation,
706 &encrypted_session_key,
707 &auth_flags)) {
708 auth_flags = 0;
709
710 /* Try again with a shorter string (Win9X truncates this packet) */
711 if (ntlmssp_state->unicode) {
712 parse_string = "CdBBUUU";
713 } else {
714 parse_string = "CdBBAAA";
715 }
716
717 /* now the NTLMSSP encoded auth hashes */
718 if (!msrpc_parse(ntlmssp_state, &request, parse_string,
719 "NTLMSSP",
720 &ntlmssp_command,
721 &ntlmssp_state->lm_resp,
722 &ntlmssp_state->nt_resp,
723 &ntlmssp_state->domain,
724 &ntlmssp_state->user,
725 &ntlmssp_state->workstation)) {
726 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
727 dump_data(2, request.data, request.length);
728
729 return NT_STATUS_INVALID_PARAMETER;
730 }
731 }
732
733 if (auth_flags)
734 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
735
736 if (DEBUGLEVEL >= 10) {
737 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(&request,
738 ntlmssp_state,
739 NULL,
740 &authenticate)))
741 {
742 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
743 }
744 }
745
746 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
747 ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
748
749#if 0
750 file_save("nthash1.dat", &ntlmssp_state->nt_resp.data, &ntlmssp_state->nt_resp.length);
751 file_save("lmhash1.dat", &ntlmssp_state->lm_resp.data, &ntlmssp_state->lm_resp.length);
752#endif
753
754 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
755 client challenge
756
757 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
758 */
759 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
760 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
761 struct MD5Context md5_session_nonce_ctx;
762 SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
763
764 doing_ntlm2 = True;
765
766 memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
767 memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
768
769 MD5Init(&md5_session_nonce_ctx);
770 MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
771 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
772
773 ntlmssp_state->chal = data_blob_talloc(
774 ntlmssp_state, session_nonce_hash, 8);
775
776 /* LM response is no longer useful */
777 data_blob_free(&ntlmssp_state->lm_resp);
778
779 /* We changed the effective challenge - set it */
780 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
781 data_blob_free(&encrypted_session_key);
782 return nt_status;
783 }
784
785 /* LM Key is incompatible. */
786 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
787 }
788 }
789
790 /*
791 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
792 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
793 * smb.conf file) and no NTLMv2 response was sent then the password check
794 * will fail here. JRA.
795 */
796
797 /* Finally, actually ask if the password is OK */
798
799 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
800 &user_session_key, &lm_session_key))) {
801 data_blob_free(&encrypted_session_key);
802 return nt_status;
803 }
804
805 dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
806 dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
807
808 /* Handle the different session key derivation for NTLM2 */
809 if (doing_ntlm2) {
810 if (user_session_key.data && user_session_key.length == 16) {
811 session_key = data_blob_talloc(ntlmssp_state,
812 NULL, 16);
813 hmac_md5(user_session_key.data, session_nonce,
814 sizeof(session_nonce), session_key.data);
815 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
816 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
817
818 } else {
819 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
820 session_key = data_blob_null;
821 }
822 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
823 if (lm_session_key.data && lm_session_key.length >= 8) {
824 if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
825 session_key = data_blob_talloc(ntlmssp_state,
826 NULL, 16);
827 if (session_key.data == NULL) {
828 return NT_STATUS_NO_MEMORY;
829 }
830 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
831 session_key.data);
832 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
833 } else {
834 uint8 zeros[24];
835 ZERO_STRUCT(zeros);
836 session_key = data_blob_talloc(
837 ntlmssp_state, NULL, 16);
838 if (session_key.data == NULL) {
839 return NT_STATUS_NO_MEMORY;
840 }
841 SMBsesskeygen_lm_sess_key(
842 lm_session_key.data, zeros,
843 session_key.data);
844 }
845 dump_data_pw("LM session key:\n", session_key.data,
846 session_key.length);
847 } else {
848 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
849 session_key = data_blob_null;
850 }
851 } else if (user_session_key.data) {
852 session_key = user_session_key;
853 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
854 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
855 } else if (lm_session_key.data) {
856 session_key = lm_session_key;
857 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
858 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
859 } else {
860 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
861 session_key = data_blob_null;
862 }
863
864 /* With KEY_EXCH, the client supplies the proposed session key,
865 but encrypts it with the long-term key */
866 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
867 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
868 data_blob_free(&encrypted_session_key);
869 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
870 (unsigned int)encrypted_session_key.length));
871 return NT_STATUS_INVALID_PARAMETER;
872 } else if (!session_key.data || session_key.length != 16) {
873 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
874 (unsigned int)session_key.length));
875 ntlmssp_state->session_key = session_key;
876 } else {
877 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
878 arcfour_crypt_blob(encrypted_session_key.data,
879 encrypted_session_key.length,
880 &session_key);
881 ntlmssp_state->session_key = data_blob_talloc(
882 ntlmssp_state, encrypted_session_key.data,
883 encrypted_session_key.length);
884 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
885 encrypted_session_key.length);
886 }
887 } else {
888 ntlmssp_state->session_key = session_key;
889 }
890
891 if (!NT_STATUS_IS_OK(nt_status)) {
892 ntlmssp_state->session_key = data_blob_null;
893 } else if (ntlmssp_state->session_key.length) {
894 nt_status = ntlmssp_sign_init(ntlmssp_state);
895 }
896
897 data_blob_free(&encrypted_session_key);
898
899 /* Only one authentication allowed per server state. */
900 ntlmssp_state->expected_state = NTLMSSP_DONE;
901
902 return nt_status;
903}
904
905/**
906 * Create an NTLMSSP state machine
907 *
908 * @param ntlmssp_state NTLMSSP State, allocated by this function
909 */
910
911NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
912{
913 *ntlmssp_state = TALLOC_ZERO_P(NULL, NTLMSSP_STATE);
914 if (!*ntlmssp_state) {
915 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
916 talloc_destroy(*ntlmssp_state);
917 return NT_STATUS_NO_MEMORY;
918 }
919
920 (*ntlmssp_state)->role = NTLMSSP_SERVER;
921
922 (*ntlmssp_state)->get_challenge = get_challenge;
923 (*ntlmssp_state)->set_challenge = set_challenge;
924 (*ntlmssp_state)->may_set_challenge = may_set_challenge;
925
926 (*ntlmssp_state)->get_global_myname = global_myname;
927 (*ntlmssp_state)->get_domain = lp_workgroup;
928 (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
929
930 (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
931
932 (*ntlmssp_state)->ref_count = 1;
933
934 (*ntlmssp_state)->neg_flags =
935 NTLMSSP_NEGOTIATE_128 |
936 NTLMSSP_NEGOTIATE_56 |
937 NTLMSSP_NEGOTIATE_VERSION |
938 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
939 NTLMSSP_NEGOTIATE_NTLM |
940 NTLMSSP_NEGOTIATE_NTLM2 |
941 NTLMSSP_NEGOTIATE_KEY_EXCH |
942 NTLMSSP_NEGOTIATE_SIGN |
943 NTLMSSP_NEGOTIATE_SEAL;
944
945 return NT_STATUS_OK;
946}
947
948/*********************************************************************
949 Client side NTLMSSP
950*********************************************************************/
951
952/**
953 * Next state function for the Initial packet
954 *
955 * @param ntlmssp_state NTLMSSP State
956 * @param request The request, as a DATA_BLOB. reply.data must be NULL
957 * @param request The reply, as an allocated DATA_BLOB, caller to free.
958 * @return Errors or NT_STATUS_OK.
959 */
960
961static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
962 DATA_BLOB reply, DATA_BLOB *next_request)
963{
964 struct NEGOTIATE_MESSAGE negotiate;
965
966 if (ntlmssp_state->unicode) {
967 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
968 } else {
969 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
970 }
971
972 if (ntlmssp_state->use_ntlmv2) {
973 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
974 }
975
976 /* generate the ntlmssp negotiate packet */
977 msrpc_gen(ntlmssp_state, next_request, "CddAA",
978 "NTLMSSP",
979 NTLMSSP_NEGOTIATE,
980 ntlmssp_state->neg_flags,
981 ntlmssp_state->get_domain(),
982 ntlmssp_state->get_global_myname());
983
984 if (DEBUGLEVEL >= 10) {
985 if (NT_STATUS_IS_OK(ntlmssp_pull_NEGOTIATE_MESSAGE(next_request,
986 ntlmssp_state,
987 NULL,
988 &negotiate)))
989 {
990 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, &negotiate);
991 }
992 }
993
994 ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
995
996 return NT_STATUS_MORE_PROCESSING_REQUIRED;
997}
998
999/**
1000 * Next state function for the Challenge Packet. Generate an auth packet.
1001 *
1002 * @param ntlmssp_state NTLMSSP State
1003 * @param request The request, as a DATA_BLOB. reply.data must be NULL
1004 * @param request The reply, as an allocated DATA_BLOB, caller to free.
1005 * @return Errors or NT_STATUS_OK.
1006 */
1007
1008static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
1009 const DATA_BLOB reply, DATA_BLOB *next_request)
1010{
1011 uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
1012 DATA_BLOB server_domain_blob;
1013 DATA_BLOB challenge_blob;
1014 DATA_BLOB struct_blob = data_blob_null;
1015 char *server_domain;
1016 const char *chal_parse_string;
1017 const char *auth_gen_string;
1018 DATA_BLOB lm_response = data_blob_null;
1019 DATA_BLOB nt_response = data_blob_null;
1020 DATA_BLOB session_key = data_blob_null;
1021 DATA_BLOB encrypted_session_key = data_blob_null;
1022 NTSTATUS nt_status = NT_STATUS_OK;
1023 struct CHALLENGE_MESSAGE challenge;
1024 struct AUTHENTICATE_MESSAGE authenticate;
1025
1026 if (ntlmssp_state->use_ccache) {
1027 struct wbcCredentialCacheParams params;
1028 struct wbcCredentialCacheInfo *info = NULL;
1029 struct wbcAuthErrorInfo *error = NULL;
1030 struct wbcNamedBlob auth_blob;
1031 struct wbcBlob *wbc_next = NULL;
1032 struct wbcBlob *wbc_session_key = NULL;
1033 wbcErr wbc_status;
1034 int i;
1035
1036 params.account_name = ntlmssp_state->user;
1037 params.domain_name = ntlmssp_state->domain;
1038 params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
1039
1040 auth_blob.name = "challenge_blob";
1041 auth_blob.flags = 0;
1042 auth_blob.blob.data = reply.data;
1043 auth_blob.blob.length = reply.length;
1044 params.num_blobs = 1;
1045 params.blobs = &auth_blob;
1046
1047 wbc_status = wbcCredentialCache(&params, &info, &error);
1048 if (error != NULL) {
1049 wbcFreeMemory(error);
1050 }
1051 if (!WBC_ERROR_IS_OK(wbc_status)) {
1052 goto noccache;
1053 }
1054
1055 for (i=0; i<info->num_blobs; i++) {
1056 if (strequal(info->blobs[i].name, "auth_blob")) {
1057 wbc_next = &info->blobs[i].blob;
1058 }
1059 if (strequal(info->blobs[i].name, "session_key")) {
1060 wbc_session_key = &info->blobs[i].blob;
1061 }
1062 }
1063 if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
1064 wbcFreeMemory(info);
1065 goto noccache;
1066 }
1067
1068 *next_request = data_blob(wbc_next->data, wbc_next->length);
1069 ntlmssp_state->session_key = data_blob(
1070 wbc_session_key->data, wbc_session_key->length);
1071
1072 wbcFreeMemory(info);
1073 goto done;
1074 }
1075
1076noccache:
1077
1078 if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
1079 "NTLMSSP",
1080 &ntlmssp_command,
1081 &server_domain_blob,
1082 &chal_flags)) {
1083 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1084 dump_data(2, reply.data, reply.length);
1085
1086 return NT_STATUS_INVALID_PARAMETER;
1087 }
1088
1089 if (DEBUGLEVEL >= 10) {
1090 if (NT_STATUS_IS_OK(ntlmssp_pull_CHALLENGE_MESSAGE(&reply,
1091 ntlmssp_state,
1092 NULL,
1093 &challenge)))
1094 {
1095 NDR_PRINT_DEBUG(CHALLENGE_MESSAGE, &challenge);
1096 }
1097 }
1098
1099 data_blob_free(&server_domain_blob);
1100
1101 DEBUG(3, ("Got challenge flags:\n"));
1102 debug_ntlmssp_flags(chal_flags);
1103
1104 ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1105
1106 if (ntlmssp_state->unicode) {
1107 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1108 chal_parse_string = "CdUdbddB";
1109 } else {
1110 chal_parse_string = "CdUdbdd";
1111 }
1112 auth_gen_string = "CdBBUUUBd";
1113 } else {
1114 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
1115 chal_parse_string = "CdAdbddB";
1116 } else {
1117 chal_parse_string = "CdAdbdd";
1118 }
1119
1120 auth_gen_string = "CdBBAAABd";
1121 }
1122
1123 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1124 debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1125
1126 if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
1127 "NTLMSSP",
1128 &ntlmssp_command,
1129 &server_domain,
1130 &chal_flags,
1131 &challenge_blob, 8,
1132 &unkn1, &unkn2,
1133 &struct_blob)) {
1134 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1135 dump_data(2, reply.data, reply.length);
1136 return NT_STATUS_INVALID_PARAMETER;
1137 }
1138
1139 ntlmssp_state->server_domain = server_domain;
1140
1141 if (challenge_blob.length != 8) {
1142 data_blob_free(&struct_blob);
1143 return NT_STATUS_INVALID_PARAMETER;
1144 }
1145
1146 if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1147 uchar zeros[16];
1148 /* do nothing - blobs are zero length */
1149
1150 ZERO_STRUCT(zeros);
1151
1152 /* session key is all zeros */
1153 session_key = data_blob_talloc(ntlmssp_state, zeros, 16);
1154
1155 /* not doing NLTM2 without a password */
1156 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1157 } else if (ntlmssp_state->use_ntlmv2) {
1158 if (!struct_blob.length) {
1159 /* be lazy, match win2k - we can't do NTLMv2 without it */
1160 DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1161 return NT_STATUS_INVALID_PARAMETER;
1162 }
1163
1164 /* TODO: if the remote server is standalone, then we should replace 'domain'
1165 with the server name as supplied above */
1166
1167 if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
1168 ntlmssp_state->user,
1169 ntlmssp_state->domain,
1170 ntlmssp_state->nt_hash, &challenge_blob,
1171 &struct_blob,
1172 &lm_response, &nt_response, NULL,
1173 &session_key)) {
1174 data_blob_free(&challenge_blob);
1175 data_blob_free(&struct_blob);
1176 return NT_STATUS_NO_MEMORY;
1177 }
1178 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1179 struct MD5Context md5_session_nonce_ctx;
1180 uchar session_nonce[16];
1181 uchar session_nonce_hash[16];
1182 uchar user_session_key[16];
1183
1184 lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1185 generate_random_buffer(lm_response.data, 8);
1186 memset(lm_response.data+8, 0, 16);
1187
1188 memcpy(session_nonce, challenge_blob.data, 8);
1189 memcpy(&session_nonce[8], lm_response.data, 8);
1190
1191 MD5Init(&md5_session_nonce_ctx);
1192 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1193 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1194 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1195
1196 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1197 DEBUG(5, ("challenge is: \n"));
1198 dump_data(5, session_nonce_hash, 8);
1199
1200 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1201 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1202 session_nonce_hash,
1203 nt_response.data);
1204
1205 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1206
1207 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
1208 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1209 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1210 } else {
1211 /* lanman auth is insecure, it may be disabled */
1212 if (lp_client_lanman_auth()) {
1213 lm_response = data_blob_talloc(ntlmssp_state,
1214 NULL, 24);
1215 SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1216 lm_response.data);
1217 }
1218
1219 nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
1220 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1221 nt_response.data);
1222
1223 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
1224 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1225 && lp_client_lanman_auth()) {
1226 SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1227 session_key.data);
1228 dump_data_pw("LM session key\n", session_key.data, session_key.length);
1229 } else {
1230 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
1231 dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1232 }
1233 }
1234 data_blob_free(&struct_blob);
1235
1236 /* Key exchange encryptes a new client-generated session key with
1237 the password-derived key */
1238 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1239 /* Make up a new session key */
1240 uint8 client_session_key[16];
1241 generate_random_buffer(client_session_key, sizeof(client_session_key));
1242
1243 /* Encrypt the new session key with the old one */
1244 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1245 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1246 arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
1247 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1248
1249 /* Mark the new session key as the 'real' session key */
1250 data_blob_free(&session_key);
1251 session_key = data_blob_talloc(ntlmssp_state,
1252 client_session_key,
1253 sizeof(client_session_key));
1254 }
1255
1256 /* this generates the actual auth packet */
1257 if (!msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
1258 "NTLMSSP",
1259 NTLMSSP_AUTH,
1260 lm_response.data, lm_response.length,
1261 nt_response.data, nt_response.length,
1262 ntlmssp_state->domain,
1263 ntlmssp_state->user,
1264 ntlmssp_state->get_global_myname(),
1265 encrypted_session_key.data, encrypted_session_key.length,
1266 ntlmssp_state->neg_flags)) {
1267
1268 return NT_STATUS_NO_MEMORY;
1269 }
1270
1271 if (DEBUGLEVEL >= 10) {
1272 if (NT_STATUS_IS_OK(ntlmssp_pull_AUTHENTICATE_MESSAGE(next_request,
1273 ntlmssp_state,
1274 NULL,
1275 &authenticate)))
1276 {
1277 NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE, &authenticate);
1278 }
1279 }
1280
1281 data_blob_free(&encrypted_session_key);
1282
1283 data_blob_free(&ntlmssp_state->chal);
1284
1285 ntlmssp_state->session_key = session_key;
1286
1287 ntlmssp_state->chal = challenge_blob;
1288 ntlmssp_state->lm_resp = lm_response;
1289 ntlmssp_state->nt_resp = nt_response;
1290
1291done:
1292
1293 ntlmssp_state->expected_state = NTLMSSP_DONE;
1294
1295 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1296 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1297 }
1298
1299 return nt_status;
1300}
1301
1302NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1303{
1304 *ntlmssp_state = TALLOC_ZERO_P(NULL, NTLMSSP_STATE);
1305 if (!*ntlmssp_state) {
1306 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1307 talloc_destroy(*ntlmssp_state);
1308 return NT_STATUS_NO_MEMORY;
1309 }
1310
1311 (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1312
1313 (*ntlmssp_state)->get_global_myname = global_myname;
1314 (*ntlmssp_state)->get_domain = lp_workgroup;
1315
1316 (*ntlmssp_state)->unicode = True;
1317
1318 (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1319
1320 (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1321
1322 (*ntlmssp_state)->ref_count = 1;
1323
1324 (*ntlmssp_state)->neg_flags =
1325 NTLMSSP_NEGOTIATE_128 |
1326 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
1327 NTLMSSP_NEGOTIATE_NTLM |
1328 NTLMSSP_NEGOTIATE_NTLM2 |
1329 NTLMSSP_NEGOTIATE_KEY_EXCH |
1330 NTLMSSP_REQUEST_TARGET;
1331
1332 return NT_STATUS_OK;
1333}
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