2 Unix SMB/Netbios implementation.
4 handle NLTMSSP, server side
6 Copyright (C) Andrew Tridgell 2001
7 Copyright (C) Andrew Bartlett 2001-2003
8 Copyright (C) Andrew Bartlett 2005 (Updated from gensec).
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.
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.
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.
27 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
28 DATA_BLOB reply, DATA_BLOB *next_request);
29 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
30 const DATA_BLOB in, DATA_BLOB *out);
31 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
32 const DATA_BLOB reply, DATA_BLOB *next_request);
33 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
34 const DATA_BLOB request, DATA_BLOB *reply);
37 * Callbacks for NTLMSSP - for both client and server operating modes
41 static 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}
57 * Print out the NTLMSSP flags for debugging
58 * @param neg_flags The flags from the packet
61 void debug_ntlmssp_flags(uint32 neg_flags)
63 DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
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_LM_KEY)
76 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_LM_KEY\n"));
77 if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
78 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NETWARE\n"));
79 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
80 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM\n"));
81 if (neg_flags & NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED)
82 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED\n"));
83 if (neg_flags & NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED)
84 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED\n"));
85 if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
86 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
87 if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
88 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
89 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
90 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM2\n"));
91 if (neg_flags & NTLMSSP_CHAL_TARGET_INFO)
92 DEBUGADD(4, (" NTLMSSP_CHAL_TARGET_INFO\n"));
93 if (neg_flags & NTLMSSP_NEGOTIATE_128)
94 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_128\n"));
95 if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
96 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
100 * Default challenge generation code.
104 static const uint8 *get_challenge(const struct ntlmssp_state *ntlmssp_state)
106 static uchar chal[8];
107 generate_random_buffer(chal, sizeof(chal));
113 * Default 'we can set the challenge to anything we like' implementation
117 static BOOL may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
123 * Default 'we can set the challenge to anything we like' implementation
125 * Does not actually do anything, as the value is always in the structure anyway.
129 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
131 SMB_ASSERT(challenge->length == 8);
136 * Set a username on an NTLMSSP context - ensures it is talloc()ed
140 NTSTATUS ntlmssp_set_username(NTLMSSP_STATE *ntlmssp_state, const char *user)
142 ntlmssp_state->user = talloc_strdup(ntlmssp_state->mem_ctx, user ? user : "" );
143 if (!ntlmssp_state->user) {
144 return NT_STATUS_NO_MEMORY;
150 * Set a password on an NTLMSSP context - ensures it is talloc()ed
153 NTSTATUS ntlmssp_set_password(NTLMSSP_STATE *ntlmssp_state, const char *password)
156 ntlmssp_state->password = NULL;
158 ntlmssp_state->password = talloc_strdup(ntlmssp_state->mem_ctx, password);
159 if (!ntlmssp_state->password) {
160 return NT_STATUS_NO_MEMORY;
167 * Set a domain on an NTLMSSP context - ensures it is talloc()ed
170 NTSTATUS ntlmssp_set_domain(NTLMSSP_STATE *ntlmssp_state, const char *domain)
172 ntlmssp_state->domain = talloc_strdup(ntlmssp_state->mem_ctx, domain ? domain : "" );
173 if (!ntlmssp_state->domain) {
174 return NT_STATUS_NO_MEMORY;
180 * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
183 NTSTATUS ntlmssp_set_workstation(NTLMSSP_STATE *ntlmssp_state, const char *workstation)
185 ntlmssp_state->workstation = talloc_strdup(ntlmssp_state->mem_ctx, workstation);
186 if (!ntlmssp_state->workstation) {
187 return NT_STATUS_NO_MEMORY;
193 * Store a DATA_BLOB containing an NTLMSSP response, for use later.
194 * This copies the data blob
197 NTSTATUS ntlmssp_store_response(NTLMSSP_STATE *ntlmssp_state,
200 ntlmssp_state->stored_response = data_blob_talloc(ntlmssp_state->mem_ctx,
201 response.data, response.length);
206 * Next state function for the NTLMSSP state machine
208 * @param ntlmssp_state NTLMSSP State
209 * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
210 * @param out The reply, as an allocated DATA_BLOB, caller to free.
211 * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
214 NTSTATUS ntlmssp_update(NTLMSSP_STATE *ntlmssp_state,
215 const DATA_BLOB in, DATA_BLOB *out)
218 uint32 ntlmssp_command;
221 if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
222 /* Called update after negotiations finished. */
223 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
224 return NT_STATUS_INVALID_PARAMETER;
227 *out = data_blob(NULL, 0);
229 if (!in.length && ntlmssp_state->stored_response.length) {
230 input = ntlmssp_state->stored_response;
232 /* we only want to read the stored response once - overwrite it */
233 ntlmssp_state->stored_response = data_blob(NULL, 0);
239 switch (ntlmssp_state->role) {
241 ntlmssp_command = NTLMSSP_INITIAL;
244 /* 'datagram' mode - no neg packet */
245 ntlmssp_command = NTLMSSP_NEGOTIATE;
249 if (!msrpc_parse(&input, "Cd",
252 DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
253 dump_data(2, (const char *)input.data, input.length);
254 return NT_STATUS_INVALID_PARAMETER;
258 if (ntlmssp_command != ntlmssp_state->expected_state) {
259 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
260 return NT_STATUS_INVALID_PARAMETER;
263 for (i=0; ntlmssp_callbacks[i].fn; i++) {
264 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
265 && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
266 return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
270 DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
271 ntlmssp_state->role, ntlmssp_command));
273 return NT_STATUS_INVALID_PARAMETER;
277 * End an NTLMSSP state machine
279 * @param ntlmssp_state NTLMSSP State, free()ed by this function
282 void ntlmssp_end(NTLMSSP_STATE **ntlmssp_state)
284 TALLOC_CTX *mem_ctx = (*ntlmssp_state)->mem_ctx;
286 (*ntlmssp_state)->ref_count--;
288 if ((*ntlmssp_state)->ref_count == 0) {
289 data_blob_free(&(*ntlmssp_state)->chal);
290 data_blob_free(&(*ntlmssp_state)->lm_resp);
291 data_blob_free(&(*ntlmssp_state)->nt_resp);
293 talloc_destroy(mem_ctx);
296 *ntlmssp_state = NULL;
301 * Determine correct target name flags for reply, given server role
302 * and negotiated flags
304 * @param ntlmssp_state NTLMSSP State
305 * @param neg_flags The flags from the packet
306 * @param chal_flags The flags to be set in the reply packet
307 * @return The 'target name' string.
310 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
311 uint32 neg_flags, uint32 *chal_flags)
313 if (neg_flags & NTLMSSP_REQUEST_TARGET) {
314 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
315 *chal_flags |= NTLMSSP_REQUEST_TARGET;
316 if (ntlmssp_state->server_role == ROLE_STANDALONE) {
317 *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
318 return ntlmssp_state->get_global_myname();
320 *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
321 return ntlmssp_state->get_domain();
328 static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
329 uint32 neg_flags, BOOL allow_lm) {
330 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
331 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
332 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
333 ntlmssp_state->unicode = True;
335 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
336 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
337 ntlmssp_state->unicode = False;
340 if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
341 /* other end forcing us to use LM */
342 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
343 ntlmssp_state->use_ntlmv2 = False;
345 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
348 if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN) {
349 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
352 if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
353 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
356 if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
357 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
358 if (neg_flags & NTLMSSP_NEGOTIATE_56) {
359 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
363 if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
364 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
367 if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
368 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
371 if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
372 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
378 Weaken NTLMSSP keys to cope with down-level clients and servers.
380 We probably should have some parameters to control this, but as
381 it only occours for LM_KEY connections, and this is controlled
382 by the client lanman auth/lanman auth parameters, it isn't too bad.
385 void ntlmssp_weaken_keys(NTLMSSP_STATE *ntlmssp_state)
387 /* Key weakening not performed on the master key for NTLM2
388 and does not occour for NTLM1. Therefore we only need
389 to do this for the LM_KEY.
392 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
393 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_128) {
395 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
396 ntlmssp_state->session_key.data[7] = 0xa0;
397 } else { /* forty bits */
398 ntlmssp_state->session_key.data[5] = 0xe5;
399 ntlmssp_state->session_key.data[6] = 0x38;
400 ntlmssp_state->session_key.data[7] = 0xb0;
402 ntlmssp_state->session_key.length = 8;
407 * Next state function for the Negotiate packet
409 * @param ntlmssp_state NTLMSSP State
410 * @param request The request, as a DATA_BLOB
411 * @param request The reply, as an allocated DATA_BLOB, caller to free.
412 * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
415 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
416 const DATA_BLOB request, DATA_BLOB *reply)
418 DATA_BLOB struct_blob;
419 fstring dnsname, dnsdomname;
420 uint32 neg_flags = 0;
421 uint32 ntlmssp_command, chal_flags;
422 const uint8 *cryptkey;
423 const char *target_name;
425 /* parse the NTLMSSP packet */
427 file_save("ntlmssp_negotiate.dat", request.data, request.length);
430 if (request.length) {
431 if ((request.length < 16) || !msrpc_parse(&request, "Cdd",
435 DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
436 (unsigned int)request.length));
437 dump_data(2, (const char *)request.data, request.length);
438 return NT_STATUS_INVALID_PARAMETER;
440 debug_ntlmssp_flags(neg_flags);
443 ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
445 /* Ask our caller what challenge they would like in the packet */
446 cryptkey = ntlmssp_state->get_challenge(ntlmssp_state);
448 /* Check if we may set the challenge */
449 if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
450 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
453 /* The flags we send back are not just the negotiated flags,
454 * they are also 'what is in this packet'. Therfore, we
455 * operate on 'chal_flags' from here on
458 chal_flags = ntlmssp_state->neg_flags;
460 /* get the right name to fill in as 'target' */
461 target_name = ntlmssp_target_name(ntlmssp_state,
462 neg_flags, &chal_flags);
463 if (target_name == NULL)
464 return NT_STATUS_INVALID_PARAMETER;
466 ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
467 ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
470 /* This should be a 'netbios domain -> DNS domain' mapping */
471 dnsdomname[0] = '\0';
472 get_mydnsdomname(dnsdomname);
473 strlower_m(dnsdomname);
476 get_mydnsfullname(dnsname);
478 /* This creates the 'blob' of names that appears at the end of the packet */
479 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
481 msrpc_gen(&struct_blob, "aaaaa",
482 NTLMSSP_NAME_TYPE_DOMAIN, target_name,
483 NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
484 NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
485 NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
488 struct_blob = data_blob(NULL, 0);
492 /* Marshel the packet in the right format, be it unicode or ASCII */
493 const char *gen_string;
494 if (ntlmssp_state->unicode) {
495 gen_string = "CdUdbddB";
497 gen_string = "CdAdbddB";
500 msrpc_gen(reply, gen_string,
507 struct_blob.data, struct_blob.length);
510 data_blob_free(&struct_blob);
512 ntlmssp_state->expected_state = NTLMSSP_AUTH;
514 return NT_STATUS_MORE_PROCESSING_REQUIRED;
518 * Next state function for the Authenticate packet
520 * @param ntlmssp_state NTLMSSP State
521 * @param request The request, as a DATA_BLOB
522 * @param request The reply, as an allocated DATA_BLOB, caller to free.
523 * @return Errors or NT_STATUS_OK.
526 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
527 const DATA_BLOB request, DATA_BLOB *reply)
529 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
530 DATA_BLOB user_session_key = data_blob(NULL, 0);
531 DATA_BLOB lm_session_key = data_blob(NULL, 0);
532 DATA_BLOB session_key = data_blob(NULL, 0);
533 uint32 ntlmssp_command, auth_flags;
534 NTSTATUS nt_status = NT_STATUS_OK;
537 BOOL doing_ntlm2 = False;
539 uchar session_nonce[16];
540 uchar session_nonce_hash[16];
542 const char *parse_string;
545 char *workstation = NULL;
547 /* parse the NTLMSSP packet */
548 *reply = data_blob(NULL, 0);
551 file_save("ntlmssp_auth.dat", request.data, request.length);
554 if (ntlmssp_state->unicode) {
555 parse_string = "CdBBUUUBd";
557 parse_string = "CdBBAAABd";
560 data_blob_free(&ntlmssp_state->lm_resp);
561 data_blob_free(&ntlmssp_state->nt_resp);
563 ntlmssp_state->user = NULL;
564 ntlmssp_state->domain = NULL;
565 ntlmssp_state->workstation = NULL;
567 /* now the NTLMSSP encoded auth hashes */
568 if (!msrpc_parse(&request, parse_string,
571 &ntlmssp_state->lm_resp,
572 &ntlmssp_state->nt_resp,
576 &encrypted_session_key,
580 SAFE_FREE(workstation);
581 data_blob_free(&encrypted_session_key);
584 /* Try again with a shorter string (Win9X truncates this packet) */
585 if (ntlmssp_state->unicode) {
586 parse_string = "CdBBUUU";
588 parse_string = "CdBBAAA";
591 /* now the NTLMSSP encoded auth hashes */
592 if (!msrpc_parse(&request, parse_string,
595 &ntlmssp_state->lm_resp,
596 &ntlmssp_state->nt_resp,
600 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
601 dump_data(2, (const char *)request.data, request.length);
604 SAFE_FREE(workstation);
606 return NT_STATUS_INVALID_PARAMETER;
611 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
613 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
616 SAFE_FREE(workstation);
617 data_blob_free(&encrypted_session_key);
621 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
624 SAFE_FREE(workstation);
625 data_blob_free(&encrypted_session_key);
629 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
632 SAFE_FREE(workstation);
633 data_blob_free(&encrypted_session_key);
639 SAFE_FREE(workstation);
641 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
642 ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
645 file_save("nthash1.dat", &ntlmssp_state->nt_resp.data, &ntlmssp_state->nt_resp.length);
646 file_save("lmhash1.dat", &ntlmssp_state->lm_resp.data, &ntlmssp_state->lm_resp.length);
649 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
652 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
654 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
655 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
656 struct MD5Context md5_session_nonce_ctx;
657 SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
661 memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
662 memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
664 MD5Init(&md5_session_nonce_ctx);
665 MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
666 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
668 ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, session_nonce_hash, 8);
670 /* LM response is no longer useful */
671 data_blob_free(&ntlmssp_state->lm_resp);
673 /* We changed the effective challenge - set it */
674 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
675 data_blob_free(&encrypted_session_key);
679 /* LM Key is incompatible. */
680 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
685 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
686 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
687 * smb.conf file) and no NTLMv2 response was sent then the password check
688 * will fail here. JRA.
691 /* Finally, actually ask if the password is OK */
693 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
694 &user_session_key, &lm_session_key))) {
695 data_blob_free(&encrypted_session_key);
699 dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
700 dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
702 /* Handle the different session key derivation for NTLM2 */
704 if (user_session_key.data && user_session_key.length == 16) {
705 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
706 hmac_md5(user_session_key.data, session_nonce,
707 sizeof(session_nonce), session_key.data);
708 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
709 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
712 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
713 session_key = data_blob(NULL, 0);
715 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
716 if (lm_session_key.data && lm_session_key.length >= 8) {
717 if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
718 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
719 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
721 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
722 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
724 /* use the key unmodified - it's
725 * probably a NULL key from the guest
727 session_key = lm_session_key;
730 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
731 session_key = data_blob(NULL, 0);
733 } else if (user_session_key.data) {
734 session_key = user_session_key;
735 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
736 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
737 } else if (lm_session_key.data) {
738 session_key = lm_session_key;
739 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
740 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
742 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
743 session_key = data_blob(NULL, 0);
746 /* With KEY_EXCH, the client supplies the proposed session key,
747 but encrypts it with the long-term key */
748 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
749 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
750 data_blob_free(&encrypted_session_key);
751 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
752 (unsigned int)encrypted_session_key.length));
753 return NT_STATUS_INVALID_PARAMETER;
754 } else if (!session_key.data || session_key.length != 16) {
755 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
756 (unsigned int)session_key.length));
757 ntlmssp_state->session_key = session_key;
759 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
760 SamOEMhash(encrypted_session_key.data,
762 encrypted_session_key.length);
763 ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state->mem_ctx,
764 encrypted_session_key.data,
765 encrypted_session_key.length);
766 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
767 encrypted_session_key.length);
770 ntlmssp_state->session_key = session_key;
773 /* The client might need us to use a partial-strength session key */
774 ntlmssp_weaken_keys(ntlmssp_state);
776 if (!NT_STATUS_IS_OK(nt_status)) {
777 ntlmssp_state->session_key = data_blob(NULL, 0);
778 } else if (ntlmssp_state->session_key.length) {
779 nt_status = ntlmssp_sign_init(ntlmssp_state);
782 data_blob_free(&encrypted_session_key);
784 /* Only one authentication allowed per server state. */
785 ntlmssp_state->expected_state = NTLMSSP_DONE;
791 * Create an NTLMSSP state machine
793 * @param ntlmssp_state NTLMSSP State, allocated by this function
796 NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
800 mem_ctx = talloc_init("NTLMSSP context");
802 *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
803 if (!*ntlmssp_state) {
804 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
805 talloc_destroy(mem_ctx);
806 return NT_STATUS_NO_MEMORY;
809 (*ntlmssp_state)->role = NTLMSSP_SERVER;
811 (*ntlmssp_state)->mem_ctx = mem_ctx;
812 (*ntlmssp_state)->get_challenge = get_challenge;
813 (*ntlmssp_state)->set_challenge = set_challenge;
814 (*ntlmssp_state)->may_set_challenge = may_set_challenge;
816 (*ntlmssp_state)->get_global_myname = global_myname;
817 (*ntlmssp_state)->get_domain = lp_workgroup;
818 (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
820 (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
822 (*ntlmssp_state)->ref_count = 1;
824 (*ntlmssp_state)->neg_flags =
825 NTLMSSP_NEGOTIATE_128 |
826 NTLMSSP_NEGOTIATE_NTLM |
827 NTLMSSP_NEGOTIATE_NTLM2 |
828 NTLMSSP_NEGOTIATE_KEY_EXCH |
829 NTLMSSP_NEGOTIATE_SIGN |
830 NTLMSSP_NEGOTIATE_SEAL;
835 /*********************************************************************
837 *********************************************************************/
840 * Next state function for the Initial packet
842 * @param ntlmssp_state NTLMSSP State
843 * @param request The request, as a DATA_BLOB. reply.data must be NULL
844 * @param request The reply, as an allocated DATA_BLOB, caller to free.
845 * @return Errors or NT_STATUS_OK.
848 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
849 DATA_BLOB reply, DATA_BLOB *next_request)
851 if (ntlmssp_state->unicode) {
852 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
854 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
857 if (ntlmssp_state->use_ntlmv2) {
858 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
861 /* generate the ntlmssp negotiate packet */
862 msrpc_gen(next_request, "CddAA",
865 ntlmssp_state->neg_flags,
866 ntlmssp_state->get_domain(),
867 ntlmssp_state->get_global_myname());
869 ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
871 return NT_STATUS_MORE_PROCESSING_REQUIRED;
875 * Next state function for the Challenge Packet. Generate an auth packet.
877 * @param ntlmssp_state NTLMSSP State
878 * @param request The request, as a DATA_BLOB. reply.data must be NULL
879 * @param request The reply, as an allocated DATA_BLOB, caller to free.
880 * @return Errors or NT_STATUS_OK.
883 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
884 const DATA_BLOB reply, DATA_BLOB *next_request)
886 uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
887 DATA_BLOB server_domain_blob;
888 DATA_BLOB challenge_blob;
889 DATA_BLOB struct_blob = data_blob(NULL, 0);
891 const char *chal_parse_string;
892 const char *auth_gen_string;
893 DATA_BLOB lm_response = data_blob(NULL, 0);
894 DATA_BLOB nt_response = data_blob(NULL, 0);
895 DATA_BLOB session_key = data_blob(NULL, 0);
896 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
897 NTSTATUS nt_status = NT_STATUS_OK;
899 if (!msrpc_parse(&reply, "CdBd",
904 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
905 dump_data(2, (const char *)reply.data, reply.length);
907 return NT_STATUS_INVALID_PARAMETER;
910 data_blob_free(&server_domain_blob);
912 DEBUG(3, ("Got challenge flags:\n"));
913 debug_ntlmssp_flags(chal_flags);
915 ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
917 if (ntlmssp_state->unicode) {
918 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
919 chal_parse_string = "CdUdbddB";
921 chal_parse_string = "CdUdbdd";
923 auth_gen_string = "CdBBUUUBd";
925 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
926 chal_parse_string = "CdAdbddB";
928 chal_parse_string = "CdAdbdd";
931 auth_gen_string = "CdBBAAABd";
934 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
935 debug_ntlmssp_flags(ntlmssp_state->neg_flags);
937 if (!msrpc_parse(&reply, chal_parse_string,
945 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
946 dump_data(2, (const char *)reply.data, reply.length);
947 return NT_STATUS_INVALID_PARAMETER;
950 ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state->mem_ctx,
953 SAFE_FREE(server_domain);
954 if (challenge_blob.length != 8) {
955 data_blob_free(&struct_blob);
956 return NT_STATUS_INVALID_PARAMETER;
959 if (!ntlmssp_state->password) {
960 static const uchar zeros[16];
961 /* do nothing - blobs are zero length */
963 /* session key is all zeros */
964 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, zeros, 16);
966 /* not doing NLTM2 without a password */
967 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
968 } else if (ntlmssp_state->use_ntlmv2) {
970 if (!struct_blob.length) {
971 /* be lazy, match win2k - we can't do NTLMv2 without it */
972 DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
973 return NT_STATUS_INVALID_PARAMETER;
976 /* TODO: if the remote server is standalone, then we should replace 'domain'
977 with the server name as supplied above */
979 if (!SMBNTLMv2encrypt(ntlmssp_state->user,
980 ntlmssp_state->domain,
981 ntlmssp_state->password, &challenge_blob,
983 &lm_response, &nt_response, &session_key)) {
984 data_blob_free(&challenge_blob);
985 data_blob_free(&struct_blob);
986 return NT_STATUS_NO_MEMORY;
988 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
989 struct MD5Context md5_session_nonce_ctx;
991 uchar session_nonce[16];
992 uchar session_nonce_hash[16];
993 uchar user_session_key[16];
994 E_md4hash(ntlmssp_state->password, nt_hash);
996 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
997 generate_random_buffer(lm_response.data, 8);
998 memset(lm_response.data+8, 0, 16);
1000 memcpy(session_nonce, challenge_blob.data, 8);
1001 memcpy(&session_nonce[8], lm_response.data, 8);
1003 MD5Init(&md5_session_nonce_ctx);
1004 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1005 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1006 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1008 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1009 DEBUG(5, ("challenge is: \n"));
1010 dump_data(5, (const char *)session_nonce_hash, 8);
1012 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1013 SMBNTencrypt(ntlmssp_state->password,
1017 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1019 SMBsesskeygen_ntv1(nt_hash, NULL, user_session_key);
1020 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1021 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1025 E_deshash(ntlmssp_state->password, lm_hash);
1026 E_md4hash(ntlmssp_state->password, nt_hash);
1028 /* lanman auth is insecure, it may be disabled */
1029 if (lp_client_lanman_auth()) {
1030 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1031 SMBencrypt(ntlmssp_state->password,challenge_blob.data,
1035 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1036 SMBNTencrypt(ntlmssp_state->password,challenge_blob.data,
1039 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1040 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1041 && lp_client_lanman_auth()) {
1042 SMBsesskeygen_lm_sess_key(lm_hash, lm_response.data,
1044 dump_data_pw("LM session key\n", session_key.data, session_key.length);
1046 SMBsesskeygen_ntv1(nt_hash, NULL, session_key.data);
1047 dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1050 data_blob_free(&struct_blob);
1052 /* Key exchange encryptes a new client-generated session key with
1053 the password-derived key */
1054 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1055 /* Make up a new session key */
1056 uint8 client_session_key[16];
1057 generate_random_buffer(client_session_key, sizeof(client_session_key));
1059 /* Encrypt the new session key with the old one */
1060 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1061 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1062 SamOEMhash(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
1063 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1065 /* Mark the new session key as the 'real' session key */
1066 data_blob_free(&session_key);
1067 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, client_session_key, sizeof(client_session_key));
1070 /* this generates the actual auth packet */
1071 if (!msrpc_gen(next_request, auth_gen_string,
1074 lm_response.data, lm_response.length,
1075 nt_response.data, nt_response.length,
1076 ntlmssp_state->domain,
1077 ntlmssp_state->user,
1078 ntlmssp_state->get_global_myname(),
1079 encrypted_session_key.data, encrypted_session_key.length,
1080 ntlmssp_state->neg_flags)) {
1082 return NT_STATUS_NO_MEMORY;
1085 data_blob_free(&encrypted_session_key);
1087 data_blob_free(&ntlmssp_state->chal);
1089 ntlmssp_state->session_key = session_key;
1091 /* The client might be using 56 or 40 bit weakened keys */
1092 ntlmssp_weaken_keys(ntlmssp_state);
1094 ntlmssp_state->chal = challenge_blob;
1095 ntlmssp_state->lm_resp = lm_response;
1096 ntlmssp_state->nt_resp = nt_response;
1098 ntlmssp_state->expected_state = NTLMSSP_DONE;
1100 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1101 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1107 NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1109 TALLOC_CTX *mem_ctx;
1111 mem_ctx = talloc_init("NTLMSSP Client context");
1113 *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
1114 if (!*ntlmssp_state) {
1115 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1116 talloc_destroy(mem_ctx);
1117 return NT_STATUS_NO_MEMORY;
1120 (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1122 (*ntlmssp_state)->mem_ctx = mem_ctx;
1124 (*ntlmssp_state)->get_global_myname = global_myname;
1125 (*ntlmssp_state)->get_domain = lp_workgroup;
1127 (*ntlmssp_state)->unicode = True;
1129 (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1131 (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1133 (*ntlmssp_state)->ref_count = 1;
1135 (*ntlmssp_state)->neg_flags =
1136 NTLMSSP_NEGOTIATE_128 |
1137 NTLMSSP_NEGOTIATE_NTLM |
1138 NTLMSSP_NEGOTIATE_NTLM2 |
1139 NTLMSSP_NEGOTIATE_KEY_EXCH |
1141 * We need to set this to allow a later SetPassword
1142 * via the SAMR pipe to succeed. Strange.... We could
1143 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
1145 NTLMSSP_NEGOTIATE_SIGN |
1146 NTLMSSP_REQUEST_TARGET;
1148 return NT_STATUS_OK;