source: branches/samba-3.0/source/libsmb/ntlmssp.c@ 815

Last change on this file since 815 was 1, checked in by Paul Smedley, 18 years ago

Initial code import
File size: 37.9 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 2 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, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23*/
24
25#include "includes.h"
26
27static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
28 DATA_BLOB reply, DATA_BLOB *next_request);
29static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
30 const DATA_BLOB in, DATA_BLOB *out);
31static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
32 const DATA_BLOB reply, DATA_BLOB *next_request);
33static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
34 const DATA_BLOB request, DATA_BLOB *reply);
35
36/**
37 * Callbacks for NTLMSSP - for both client and server operating modes
38 *
39 */
40
41static const struct ntlmssp_callbacks {
42 enum NTLMSSP_ROLE role;
43 enum NTLM_MESSAGE_TYPE ntlmssp_command;
44 NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
45 DATA_BLOB in, DATA_BLOB *out);
46} ntlmssp_callbacks[] = {
47 {NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
48 {NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
49 {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
50 {NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
51 {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
52 {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
53};
54
55
56/**
57 * Print out the NTLMSSP flags for debugging
58 * @param neg_flags The flags from the packet
59 */
60
61void debug_ntlmssp_flags(uint32 neg_flags)
62{
63 DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
64
65 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
66 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_UNICODE\n"));
67 if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
68 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM\n"));
69 if (neg_flags & NTLMSSP_REQUEST_TARGET)
70 DEBUGADD(4, (" NTLMSSP_REQUEST_TARGET\n"));
71 if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
72 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SIGN\n"));
73 if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
74 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SEAL\n"));
75 if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM_STYLE)
76 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_DATAGRAM_STYLE\n"));
77 if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
78 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_LM_KEY\n"));
79 if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
80 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NETWARE\n"));
81 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
82 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM\n"));
83 if (neg_flags & NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED)
84 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED\n"));
85 if (neg_flags & NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED)
86 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED\n"));
87 if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
88 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
89 if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
90 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
91 if (neg_flags & NTLMSSP_CHAL_ACCEPT_RESPONSE)
92 DEBUGADD(4, (" NTLMSSP_CHAL_ACCEPT_RESPONSE\n"));
93 if (neg_flags & NTLMSSP_CHAL_NON_NT_SESSION_KEY)
94 DEBUGADD(4, (" NTLMSSP_CHAL_NON_NT_SESSION_KEY\n"));
95 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
96 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM2\n"));
97 if (neg_flags & NTLMSSP_CHAL_TARGET_INFO)
98 DEBUGADD(4, (" NTLMSSP_CHAL_TARGET_INFO\n"));
99 if (neg_flags & NTLMSSP_NEGOTIATE_128)
100 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_128\n"));
101 if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
102 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
103 if (neg_flags & NTLMSSP_NEGOTIATE_56)
104 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_56\n"));
105}
106
107/**
108 * Default challenge generation code.
109 *
110 */
111
112static const uint8 *get_challenge(const struct ntlmssp_state *ntlmssp_state)
113{
114 static uchar chal[8];
115 generate_random_buffer(chal, sizeof(chal));
116
117 return chal;
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->mem_ctx, 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->mem_ctx, lm_hash, 16);
167 ntlmssp_state->nt_hash = (unsigned char *)
168 TALLOC_MEMDUP(ntlmssp_state->mem_ctx, 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->mem_ctx, domain ? domain : "" );
204 if (!ntlmssp_state->domain) {
205 return NT_STATUS_NO_MEMORY;
206 }
207 return NT_STATUS_OK;
208}
209
210/**
211 * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
212 *
213 */
214NTSTATUS ntlmssp_set_workstation(NTLMSSP_STATE *ntlmssp_state, const char *workstation)
215{
216 ntlmssp_state->workstation = talloc_strdup(ntlmssp_state->mem_ctx, workstation);
217 if (!ntlmssp_state->workstation) {
218 return NT_STATUS_NO_MEMORY;
219 }
220 return NT_STATUS_OK;
221}
222
223/**
224 * Store a DATA_BLOB containing an NTLMSSP response, for use later.
225 * This copies the data blob
226 */
227
228NTSTATUS ntlmssp_store_response(NTLMSSP_STATE *ntlmssp_state,
229 DATA_BLOB response)
230{
231 ntlmssp_state->stored_response = data_blob_talloc(ntlmssp_state->mem_ctx,
232 response.data, response.length);
233 return NT_STATUS_OK;
234}
235
236/**
237 * Request features for the NTLMSSP negotiation
238 *
239 * @param ntlmssp_state NTLMSSP state
240 * @param feature_list List of space seperated features requested from NTLMSSP.
241 */
242void ntlmssp_want_feature_list(NTLMSSP_STATE *ntlmssp_state, char *feature_list)
243{
244 /*
245 * We need to set this to allow a later SetPassword
246 * via the SAMR pipe to succeed. Strange.... We could
247 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
248 */
249 if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
250 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
251 }
252 if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
253 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
254 }
255 if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
256 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
257 }
258}
259
260/**
261 * Request a feature for the NTLMSSP negotiation
262 *
263 * @param ntlmssp_state NTLMSSP state
264 * @param feature Bit flag specifying the requested feature
265 */
266void ntlmssp_want_feature(NTLMSSP_STATE *ntlmssp_state, uint32 feature)
267{
268 /* As per JRA's comment above */
269 if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
270 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
271 }
272 if (feature & NTLMSSP_FEATURE_SIGN) {
273 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
274 }
275 if (feature & NTLMSSP_FEATURE_SEAL) {
276 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
277 }
278}
279
280/**
281 * Next state function for the NTLMSSP state machine
282 *
283 * @param ntlmssp_state NTLMSSP State
284 * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
285 * @param out The reply, as an allocated DATA_BLOB, caller to free.
286 * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
287 */
288
289NTSTATUS ntlmssp_update(NTLMSSP_STATE *ntlmssp_state,
290 const DATA_BLOB in, DATA_BLOB *out)
291{
292 DATA_BLOB input;
293 uint32 ntlmssp_command;
294 int i;
295
296 if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
297 /* Called update after negotiations finished. */
298 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
299 return NT_STATUS_INVALID_PARAMETER;
300 }
301
302 *out = data_blob(NULL, 0);
303
304 if (!in.length && ntlmssp_state->stored_response.length) {
305 input = ntlmssp_state->stored_response;
306
307 /* we only want to read the stored response once - overwrite it */
308 ntlmssp_state->stored_response = data_blob(NULL, 0);
309 } else {
310 input = in;
311 }
312
313 if (!input.length) {
314 switch (ntlmssp_state->role) {
315 case NTLMSSP_CLIENT:
316 ntlmssp_command = NTLMSSP_INITIAL;
317 break;
318 case NTLMSSP_SERVER:
319 /* 'datagram' mode - no neg packet */
320 ntlmssp_command = NTLMSSP_NEGOTIATE;
321 break;
322 }
323 } else {
324 if (!msrpc_parse(&input, "Cd",
325 "NTLMSSP",
326 &ntlmssp_command)) {
327 DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
328 dump_data(2, (const char *)input.data, input.length);
329 return NT_STATUS_INVALID_PARAMETER;
330 }
331 }
332
333 if (ntlmssp_command != ntlmssp_state->expected_state) {
334 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
335 return NT_STATUS_INVALID_PARAMETER;
336 }
337
338 for (i=0; ntlmssp_callbacks[i].fn; i++) {
339 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
340 && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
341 return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
342 }
343 }
344
345 DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
346 ntlmssp_state->role, ntlmssp_command));
347
348 return NT_STATUS_INVALID_PARAMETER;
349}
350
351/**
352 * End an NTLMSSP state machine
353 *
354 * @param ntlmssp_state NTLMSSP State, free()ed by this function
355 */
356
357void ntlmssp_end(NTLMSSP_STATE **ntlmssp_state)
358{
359 TALLOC_CTX *mem_ctx = (*ntlmssp_state)->mem_ctx;
360
361 (*ntlmssp_state)->ref_count--;
362
363 if ((*ntlmssp_state)->ref_count == 0) {
364 data_blob_free(&(*ntlmssp_state)->chal);
365 data_blob_free(&(*ntlmssp_state)->lm_resp);
366 data_blob_free(&(*ntlmssp_state)->nt_resp);
367
368 talloc_destroy(mem_ctx);
369 }
370
371 *ntlmssp_state = NULL;
372 return;
373}
374
375/**
376 * Determine correct target name flags for reply, given server role
377 * and negotiated flags
378 *
379 * @param ntlmssp_state NTLMSSP State
380 * @param neg_flags The flags from the packet
381 * @param chal_flags The flags to be set in the reply packet
382 * @return The 'target name' string.
383 */
384
385static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
386 uint32 neg_flags, uint32 *chal_flags)
387{
388 if (neg_flags & NTLMSSP_REQUEST_TARGET) {
389 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
390 *chal_flags |= NTLMSSP_REQUEST_TARGET;
391 if (ntlmssp_state->server_role == ROLE_STANDALONE) {
392 *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
393 return ntlmssp_state->get_global_myname();
394 } else {
395 *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
396 return ntlmssp_state->get_domain();
397 };
398 } else {
399 return "";
400 }
401}
402
403static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
404 uint32 neg_flags, BOOL allow_lm) {
405 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
406 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
407 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
408 ntlmssp_state->unicode = True;
409 } else {
410 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
411 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
412 ntlmssp_state->unicode = False;
413 }
414
415 if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
416 /* other end forcing us to use LM */
417 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
418 ntlmssp_state->use_ntlmv2 = False;
419 } else {
420 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
421 }
422
423 if (!(neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
424 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
425 }
426
427 if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
428 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
429 }
430
431 if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
432 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
433 }
434
435 if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
436 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
437 }
438
439 if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
440 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
441 }
442
443 if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
444 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
445 }
446
447 if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
448 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
449 }
450
451 /* Woop Woop - unknown flag for Windows compatibility...
452 What does this really do ? JRA. */
453 if (!(neg_flags & NTLMSSP_UNKNOWN_02000000)) {
454 ntlmssp_state->neg_flags &= ~NTLMSSP_UNKNOWN_02000000;
455 }
456
457 if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
458 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
459 }
460}
461
462/**
463 Weaken NTLMSSP keys to cope with down-level clients and servers.
464
465 We probably should have some parameters to control this, but as
466 it only occours for LM_KEY connections, and this is controlled
467 by the client lanman auth/lanman auth parameters, it isn't too bad.
468*/
469
470DATA_BLOB ntlmssp_weaken_keys(NTLMSSP_STATE *ntlmssp_state, TALLOC_CTX *mem_ctx)
471{
472 DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
473 ntlmssp_state->session_key.data,
474 ntlmssp_state->session_key.length);
475
476 /* Nothing to weaken. We certainly don't want to 'extend' the length... */
477 if (weakened_key.length < 16) {
478 /* perhaps there was no key? */
479 return weakened_key;
480 }
481
482 /* Key weakening not performed on the master key for NTLM2
483 and does not occour for NTLM1. Therefore we only need
484 to do this for the LM_KEY.
485 */
486
487 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
488 /* LM key doesn't support 128 bit crypto, so this is
489 * the best we can do. If you negotiate 128 bit, but
490 * not 56, you end up with 40 bit... */
491 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
492 weakened_key.data[7] = 0xa0;
493 } else { /* forty bits */
494 weakened_key.data[5] = 0xe5;
495 weakened_key.data[6] = 0x38;
496 weakened_key.data[7] = 0xb0;
497 }
498 weakened_key.length = 8;
499 }
500 return weakened_key;
501}
502
503/**
504 * Next state function for the Negotiate packet
505 *
506 * @param ntlmssp_state NTLMSSP State
507 * @param request The request, as a DATA_BLOB
508 * @param request The reply, as an allocated DATA_BLOB, caller to free.
509 * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
510 */
511
512static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
513 const DATA_BLOB request, DATA_BLOB *reply)
514{
515 DATA_BLOB struct_blob;
516 fstring dnsname, dnsdomname;
517 uint32 neg_flags = 0;
518 uint32 ntlmssp_command, chal_flags;
519 const uint8 *cryptkey;
520 const char *target_name;
521
522 /* parse the NTLMSSP packet */
523#if 0
524 file_save("ntlmssp_negotiate.dat", request.data, request.length);
525#endif
526
527 if (request.length) {
528 if ((request.length < 16) || !msrpc_parse(&request, "Cdd",
529 "NTLMSSP",
530 &ntlmssp_command,
531 &neg_flags)) {
532 DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
533 (unsigned int)request.length));
534 dump_data(2, (const char *)request.data, request.length);
535 return NT_STATUS_INVALID_PARAMETER;
536 }
537 debug_ntlmssp_flags(neg_flags);
538 }
539
540 ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
541
542 /* Ask our caller what challenge they would like in the packet */
543 cryptkey = ntlmssp_state->get_challenge(ntlmssp_state);
544
545 /* Check if we may set the challenge */
546 if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
547 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
548 }
549
550 /* The flags we send back are not just the negotiated flags,
551 * they are also 'what is in this packet'. Therfore, we
552 * operate on 'chal_flags' from here on
553 */
554
555 chal_flags = ntlmssp_state->neg_flags;
556
557 /* get the right name to fill in as 'target' */
558 target_name = ntlmssp_target_name(ntlmssp_state,
559 neg_flags, &chal_flags);
560 if (target_name == NULL)
561 return NT_STATUS_INVALID_PARAMETER;
562
563 ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
564 ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
565
566
567 /* This should be a 'netbios domain -> DNS domain' mapping */
568 dnsdomname[0] = '\0';
569 get_mydnsdomname(dnsdomname);
570 strlower_m(dnsdomname);
571
572 dnsname[0] = '\0';
573 get_mydnsfullname(dnsname);
574
575 /* This creates the 'blob' of names that appears at the end of the packet */
576 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
577 {
578 msrpc_gen(&struct_blob, "aaaaa",
579 NTLMSSP_NAME_TYPE_DOMAIN, target_name,
580 NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
581 NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
582 NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
583 0, "");
584 } else {
585 struct_blob = data_blob(NULL, 0);
586 }
587
588 {
589 /* Marshel the packet in the right format, be it unicode or ASCII */
590 const char *gen_string;
591 if (ntlmssp_state->unicode) {
592 gen_string = "CdUdbddB";
593 } else {
594 gen_string = "CdAdbddB";
595 }
596
597 msrpc_gen(reply, gen_string,
598 "NTLMSSP",
599 NTLMSSP_CHALLENGE,
600 target_name,
601 chal_flags,
602 cryptkey, 8,
603 0, 0,
604 struct_blob.data, struct_blob.length);
605 }
606
607 data_blob_free(&struct_blob);
608
609 ntlmssp_state->expected_state = NTLMSSP_AUTH;
610
611 return NT_STATUS_MORE_PROCESSING_REQUIRED;
612}
613
614/**
615 * Next state function for the Authenticate packet
616 *
617 * @param ntlmssp_state NTLMSSP State
618 * @param request The request, as a DATA_BLOB
619 * @param request The reply, as an allocated DATA_BLOB, caller to free.
620 * @return Errors or NT_STATUS_OK.
621 */
622
623static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
624 const DATA_BLOB request, DATA_BLOB *reply)
625{
626 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
627 DATA_BLOB user_session_key = data_blob(NULL, 0);
628 DATA_BLOB lm_session_key = data_blob(NULL, 0);
629 DATA_BLOB session_key = data_blob(NULL, 0);
630 uint32 ntlmssp_command, auth_flags;
631 NTSTATUS nt_status = NT_STATUS_OK;
632
633 /* used by NTLM2 */
634 BOOL doing_ntlm2 = False;
635
636 uchar session_nonce[16];
637 uchar session_nonce_hash[16];
638
639 const char *parse_string;
640 char *domain = NULL;
641 char *user = NULL;
642 char *workstation = NULL;
643
644 /* parse the NTLMSSP packet */
645 *reply = data_blob(NULL, 0);
646
647#if 0
648 file_save("ntlmssp_auth.dat", request.data, request.length);
649#endif
650
651 if (ntlmssp_state->unicode) {
652 parse_string = "CdBBUUUBd";
653 } else {
654 parse_string = "CdBBAAABd";
655 }
656
657 data_blob_free(&ntlmssp_state->lm_resp);
658 data_blob_free(&ntlmssp_state->nt_resp);
659
660 ntlmssp_state->user = NULL;
661 ntlmssp_state->domain = NULL;
662 ntlmssp_state->workstation = NULL;
663
664 /* now the NTLMSSP encoded auth hashes */
665 if (!msrpc_parse(&request, parse_string,
666 "NTLMSSP",
667 &ntlmssp_command,
668 &ntlmssp_state->lm_resp,
669 &ntlmssp_state->nt_resp,
670 &domain,
671 &user,
672 &workstation,
673 &encrypted_session_key,
674 &auth_flags)) {
675 SAFE_FREE(domain);
676 SAFE_FREE(user);
677 SAFE_FREE(workstation);
678 data_blob_free(&encrypted_session_key);
679 auth_flags = 0;
680
681 /* Try again with a shorter string (Win9X truncates this packet) */
682 if (ntlmssp_state->unicode) {
683 parse_string = "CdBBUUU";
684 } else {
685 parse_string = "CdBBAAA";
686 }
687
688 /* now the NTLMSSP encoded auth hashes */
689 if (!msrpc_parse(&request, parse_string,
690 "NTLMSSP",
691 &ntlmssp_command,
692 &ntlmssp_state->lm_resp,
693 &ntlmssp_state->nt_resp,
694 &domain,
695 &user,
696 &workstation)) {
697 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
698 dump_data(2, (const char *)request.data, request.length);
699 SAFE_FREE(domain);
700 SAFE_FREE(user);
701 SAFE_FREE(workstation);
702
703 return NT_STATUS_INVALID_PARAMETER;
704 }
705 }
706
707 if (auth_flags)
708 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
709
710 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
711 SAFE_FREE(domain);
712 SAFE_FREE(user);
713 SAFE_FREE(workstation);
714 data_blob_free(&encrypted_session_key);
715 return nt_status;
716 }
717
718 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
719 SAFE_FREE(domain);
720 SAFE_FREE(user);
721 SAFE_FREE(workstation);
722 data_blob_free(&encrypted_session_key);
723 return nt_status;
724 }
725
726 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
727 SAFE_FREE(domain);
728 SAFE_FREE(user);
729 SAFE_FREE(workstation);
730 data_blob_free(&encrypted_session_key);
731 return nt_status;
732 }
733
734 SAFE_FREE(domain);
735 SAFE_FREE(user);
736 SAFE_FREE(workstation);
737
738 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
739 ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
740
741#if 0
742 file_save("nthash1.dat", &ntlmssp_state->nt_resp.data, &ntlmssp_state->nt_resp.length);
743 file_save("lmhash1.dat", &ntlmssp_state->lm_resp.data, &ntlmssp_state->lm_resp.length);
744#endif
745
746 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
747 client challenge
748
749 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
750 */
751 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
752 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
753 struct MD5Context md5_session_nonce_ctx;
754 SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
755
756 doing_ntlm2 = True;
757
758 memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
759 memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
760
761 MD5Init(&md5_session_nonce_ctx);
762 MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
763 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
764
765 ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, session_nonce_hash, 8);
766
767 /* LM response is no longer useful */
768 data_blob_free(&ntlmssp_state->lm_resp);
769
770 /* We changed the effective challenge - set it */
771 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
772 data_blob_free(&encrypted_session_key);
773 return nt_status;
774 }
775
776 /* LM Key is incompatible. */
777 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
778 }
779 }
780
781 /*
782 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
783 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
784 * smb.conf file) and no NTLMv2 response was sent then the password check
785 * will fail here. JRA.
786 */
787
788 /* Finally, actually ask if the password is OK */
789
790 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
791 &user_session_key, &lm_session_key))) {
792 data_blob_free(&encrypted_session_key);
793 return nt_status;
794 }
795
796 dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
797 dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
798
799 /* Handle the different session key derivation for NTLM2 */
800 if (doing_ntlm2) {
801 if (user_session_key.data && user_session_key.length == 16) {
802 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
803 hmac_md5(user_session_key.data, session_nonce,
804 sizeof(session_nonce), session_key.data);
805 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
806 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
807
808 } else {
809 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
810 session_key = data_blob(NULL, 0);
811 }
812 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
813 if (lm_session_key.data && lm_session_key.length >= 8) {
814 if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
815 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
816 if (session_key.data == NULL) {
817 return NT_STATUS_NO_MEMORY;
818 }
819 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
820 session_key.data);
821 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
822 } else {
823 static const uint8 zeros[24] = { 0, };
824 session_key = data_blob_talloc(
825 ntlmssp_state->mem_ctx, NULL, 16);
826 if (session_key.data == NULL) {
827 return NT_STATUS_NO_MEMORY;
828 }
829 SMBsesskeygen_lm_sess_key(
830 lm_session_key.data, zeros,
831 session_key.data);
832 }
833 dump_data_pw("LM session key:\n", session_key.data,
834 session_key.length);
835 } else {
836 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
837 session_key = data_blob(NULL, 0);
838 }
839 } else if (user_session_key.data) {
840 session_key = user_session_key;
841 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
842 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
843 } else if (lm_session_key.data) {
844 session_key = lm_session_key;
845 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
846 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
847 } else {
848 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
849 session_key = data_blob(NULL, 0);
850 }
851
852 /* With KEY_EXCH, the client supplies the proposed session key,
853 but encrypts it with the long-term key */
854 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
855 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
856 data_blob_free(&encrypted_session_key);
857 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
858 (unsigned int)encrypted_session_key.length));
859 return NT_STATUS_INVALID_PARAMETER;
860 } else if (!session_key.data || session_key.length != 16) {
861 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
862 (unsigned int)session_key.length));
863 ntlmssp_state->session_key = session_key;
864 } else {
865 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
866 SamOEMhash(encrypted_session_key.data,
867 session_key.data,
868 encrypted_session_key.length);
869 ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state->mem_ctx,
870 encrypted_session_key.data,
871 encrypted_session_key.length);
872 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
873 encrypted_session_key.length);
874 }
875 } else {
876 ntlmssp_state->session_key = session_key;
877 }
878
879 if (!NT_STATUS_IS_OK(nt_status)) {
880 ntlmssp_state->session_key = data_blob(NULL, 0);
881 } else if (ntlmssp_state->session_key.length) {
882 nt_status = ntlmssp_sign_init(ntlmssp_state);
883 }
884
885 data_blob_free(&encrypted_session_key);
886
887 /* Only one authentication allowed per server state. */
888 ntlmssp_state->expected_state = NTLMSSP_DONE;
889
890 return nt_status;
891}
892
893/**
894 * Create an NTLMSSP state machine
895 *
896 * @param ntlmssp_state NTLMSSP State, allocated by this function
897 */
898
899NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
900{
901 TALLOC_CTX *mem_ctx;
902
903 mem_ctx = talloc_init("NTLMSSP context");
904
905 *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
906 if (!*ntlmssp_state) {
907 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
908 talloc_destroy(mem_ctx);
909 return NT_STATUS_NO_MEMORY;
910 }
911
912 (*ntlmssp_state)->role = NTLMSSP_SERVER;
913
914 (*ntlmssp_state)->mem_ctx = mem_ctx;
915 (*ntlmssp_state)->get_challenge = get_challenge;
916 (*ntlmssp_state)->set_challenge = set_challenge;
917 (*ntlmssp_state)->may_set_challenge = may_set_challenge;
918
919 (*ntlmssp_state)->get_global_myname = global_myname;
920 (*ntlmssp_state)->get_domain = lp_workgroup;
921 (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
922
923 (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
924
925 (*ntlmssp_state)->ref_count = 1;
926
927 (*ntlmssp_state)->neg_flags =
928 NTLMSSP_NEGOTIATE_128 |
929 NTLMSSP_NEGOTIATE_56 |
930 NTLMSSP_UNKNOWN_02000000 |
931 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
932 NTLMSSP_NEGOTIATE_NTLM |
933 NTLMSSP_NEGOTIATE_NTLM2 |
934 NTLMSSP_NEGOTIATE_KEY_EXCH |
935 NTLMSSP_NEGOTIATE_SIGN |
936 NTLMSSP_NEGOTIATE_SEAL;
937
938 return NT_STATUS_OK;
939}
940
941/*********************************************************************
942 Client side NTLMSSP
943*********************************************************************/
944
945/**
946 * Next state function for the Initial packet
947 *
948 * @param ntlmssp_state NTLMSSP State
949 * @param request The request, as a DATA_BLOB. reply.data must be NULL
950 * @param request The reply, as an allocated DATA_BLOB, caller to free.
951 * @return Errors or NT_STATUS_OK.
952 */
953
954static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
955 DATA_BLOB reply, DATA_BLOB *next_request)
956{
957 if (ntlmssp_state->unicode) {
958 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
959 } else {
960 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
961 }
962
963 if (ntlmssp_state->use_ntlmv2) {
964 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
965 }
966
967 /* generate the ntlmssp negotiate packet */
968 msrpc_gen(next_request, "CddAA",
969 "NTLMSSP",
970 NTLMSSP_NEGOTIATE,
971 ntlmssp_state->neg_flags,
972 ntlmssp_state->get_domain(),
973 ntlmssp_state->get_global_myname());
974
975 ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
976
977 return NT_STATUS_MORE_PROCESSING_REQUIRED;
978}
979
980/**
981 * Next state function for the Challenge Packet. Generate an auth packet.
982 *
983 * @param ntlmssp_state NTLMSSP State
984 * @param request The request, as a DATA_BLOB. reply.data must be NULL
985 * @param request The reply, as an allocated DATA_BLOB, caller to free.
986 * @return Errors or NT_STATUS_OK.
987 */
988
989static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
990 const DATA_BLOB reply, DATA_BLOB *next_request)
991{
992 uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
993 DATA_BLOB server_domain_blob;
994 DATA_BLOB challenge_blob;
995 DATA_BLOB struct_blob = data_blob(NULL, 0);
996 char *server_domain;
997 const char *chal_parse_string;
998 const char *auth_gen_string;
999 DATA_BLOB lm_response = data_blob(NULL, 0);
1000 DATA_BLOB nt_response = data_blob(NULL, 0);
1001 DATA_BLOB session_key = data_blob(NULL, 0);
1002 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
1003 NTSTATUS nt_status = NT_STATUS_OK;
1004
1005 if (!msrpc_parse(&reply, "CdBd",
1006 "NTLMSSP",
1007 &ntlmssp_command,
1008 &server_domain_blob,
1009 &chal_flags)) {
1010 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
1011 dump_data(2, (const char *)reply.data, reply.length);
1012
1013 return NT_STATUS_INVALID_PARAMETER;
1014 }
1015
1016 data_blob_free(&server_domain_blob);
1017
1018 DEBUG(3, ("Got challenge flags:\n"));
1019 debug_ntlmssp_flags(chal_flags);
1020
1021 ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
1022
1023 if (ntlmssp_state->unicode) {
1024 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
1025 chal_parse_string = "CdUdbddB";
1026 } else {
1027 chal_parse_string = "CdUdbdd";
1028 }
1029 auth_gen_string = "CdBBUUUBd";
1030 } else {
1031 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
1032 chal_parse_string = "CdAdbddB";
1033 } else {
1034 chal_parse_string = "CdAdbdd";
1035 }
1036
1037 auth_gen_string = "CdBBAAABd";
1038 }
1039
1040 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
1041 debug_ntlmssp_flags(ntlmssp_state->neg_flags);
1042
1043 if (!msrpc_parse(&reply, chal_parse_string,
1044 "NTLMSSP",
1045 &ntlmssp_command,
1046 &server_domain,
1047 &chal_flags,
1048 &challenge_blob, 8,
1049 &unkn1, &unkn2,
1050 &struct_blob)) {
1051 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
1052 dump_data(2, (const char *)reply.data, reply.length);
1053 return NT_STATUS_INVALID_PARAMETER;
1054 }
1055
1056 ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state->mem_ctx,
1057 server_domain);
1058
1059 SAFE_FREE(server_domain);
1060 if (challenge_blob.length != 8) {
1061 data_blob_free(&struct_blob);
1062 return NT_STATUS_INVALID_PARAMETER;
1063 }
1064
1065 if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
1066 static const uchar zeros[16] = { 0, };
1067 /* do nothing - blobs are zero length */
1068
1069 /* session key is all zeros */
1070 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, zeros, 16);
1071
1072 /* not doing NLTM2 without a password */
1073 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
1074 } else if (ntlmssp_state->use_ntlmv2) {
1075
1076 if (!struct_blob.length) {
1077 /* be lazy, match win2k - we can't do NTLMv2 without it */
1078 DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1079 return NT_STATUS_INVALID_PARAMETER;
1080 }
1081
1082 /* TODO: if the remote server is standalone, then we should replace 'domain'
1083 with the server name as supplied above */
1084
1085 if (!SMBNTLMv2encrypt_hash(ntlmssp_state->user,
1086 ntlmssp_state->domain,
1087 ntlmssp_state->nt_hash, &challenge_blob,
1088 &struct_blob,
1089 &lm_response, &nt_response, &session_key)) {
1090 data_blob_free(&challenge_blob);
1091 data_blob_free(&struct_blob);
1092 return NT_STATUS_NO_MEMORY;
1093 }
1094 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1095 struct MD5Context md5_session_nonce_ctx;
1096 uchar session_nonce[16];
1097 uchar session_nonce_hash[16];
1098 uchar user_session_key[16];
1099
1100 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1101 generate_random_buffer(lm_response.data, 8);
1102 memset(lm_response.data+8, 0, 16);
1103
1104 memcpy(session_nonce, challenge_blob.data, 8);
1105 memcpy(&session_nonce[8], lm_response.data, 8);
1106
1107 MD5Init(&md5_session_nonce_ctx);
1108 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1109 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1110 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1111
1112 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1113 DEBUG(5, ("challenge is: \n"));
1114 dump_data(5, (const char *)session_nonce_hash, 8);
1115
1116 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1117 SMBNTencrypt_hash(ntlmssp_state->nt_hash,
1118 session_nonce_hash,
1119 nt_response.data);
1120
1121 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1122
1123 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, NULL, user_session_key);
1124 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1125 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1126 } else {
1127 /* lanman auth is insecure, it may be disabled */
1128 if (lp_client_lanman_auth()) {
1129 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1130 SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
1131 lm_response.data);
1132 }
1133
1134 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1135 SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
1136 nt_response.data);
1137
1138 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1139 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1140 && lp_client_lanman_auth()) {
1141 SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
1142 session_key.data);
1143 dump_data_pw("LM session key\n", session_key.data, session_key.length);
1144 } else {
1145 SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, NULL, session_key.data);
1146 dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1147 }
1148 }
1149 data_blob_free(&struct_blob);
1150
1151 /* Key exchange encryptes a new client-generated session key with
1152 the password-derived key */
1153 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1154 /* Make up a new session key */
1155 uint8 client_session_key[16];
1156 generate_random_buffer(client_session_key, sizeof(client_session_key));
1157
1158 /* Encrypt the new session key with the old one */
1159 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1160 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1161 SamOEMhash(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
1162 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1163
1164 /* Mark the new session key as the 'real' session key */
1165 data_blob_free(&session_key);
1166 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, client_session_key, sizeof(client_session_key));
1167 }
1168
1169 /* this generates the actual auth packet */
1170 if (!msrpc_gen(next_request, auth_gen_string,
1171 "NTLMSSP",
1172 NTLMSSP_AUTH,
1173 lm_response.data, lm_response.length,
1174 nt_response.data, nt_response.length,
1175 ntlmssp_state->domain,
1176 ntlmssp_state->user,
1177 ntlmssp_state->get_global_myname(),
1178 encrypted_session_key.data, encrypted_session_key.length,
1179 ntlmssp_state->neg_flags)) {
1180
1181 return NT_STATUS_NO_MEMORY;
1182 }
1183
1184 data_blob_free(&encrypted_session_key);
1185
1186 data_blob_free(&ntlmssp_state->chal);
1187
1188 ntlmssp_state->session_key = session_key;
1189
1190 ntlmssp_state->chal = challenge_blob;
1191 ntlmssp_state->lm_resp = lm_response;
1192 ntlmssp_state->nt_resp = nt_response;
1193
1194 ntlmssp_state->expected_state = NTLMSSP_DONE;
1195
1196 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1197 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1198 }
1199
1200 return nt_status;
1201}
1202
1203NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1204{
1205 TALLOC_CTX *mem_ctx;
1206
1207 mem_ctx = talloc_init("NTLMSSP Client context");
1208
1209 *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
1210 if (!*ntlmssp_state) {
1211 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1212 talloc_destroy(mem_ctx);
1213 return NT_STATUS_NO_MEMORY;
1214 }
1215
1216 (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1217
1218 (*ntlmssp_state)->mem_ctx = mem_ctx;
1219
1220 (*ntlmssp_state)->get_global_myname = global_myname;
1221 (*ntlmssp_state)->get_domain = lp_workgroup;
1222
1223 (*ntlmssp_state)->unicode = True;
1224
1225 (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1226
1227 (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1228
1229 (*ntlmssp_state)->ref_count = 1;
1230
1231 (*ntlmssp_state)->neg_flags =
1232 NTLMSSP_NEGOTIATE_128 |
1233 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
1234 NTLMSSP_NEGOTIATE_NTLM |
1235 NTLMSSP_NEGOTIATE_NTLM2 |
1236 NTLMSSP_NEGOTIATE_KEY_EXCH |
1237 NTLMSSP_REQUEST_TARGET;
1238
1239 return NT_STATUS_OK;
1240}
Note: See TracBrowser for help on using the repository browser.