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_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"));
108 * Default challenge generation code.
112 static const uint8 *get_challenge(const struct ntlmssp_state *ntlmssp_state)
114 static uchar chal[8];
115 generate_random_buffer(chal, sizeof(chal));
121 * Default 'we can set the challenge to anything we like' implementation
125 static BOOL may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
131 * Default 'we can set the challenge to anything we like' implementation
133 * Does not actually do anything, as the value is always in the structure anyway.
137 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
139 SMB_ASSERT(challenge->length == 8);
144 * Set a username on an NTLMSSP context - ensures it is talloc()ed
148 NTSTATUS ntlmssp_set_username(NTLMSSP_STATE *ntlmssp_state, const char *user)
150 ntlmssp_state->user = talloc_strdup(ntlmssp_state->mem_ctx, user ? user : "" );
151 if (!ntlmssp_state->user) {
152 return NT_STATUS_NO_MEMORY;
158 * Set a password on an NTLMSSP context - ensures it is talloc()ed
161 NTSTATUS ntlmssp_set_password(NTLMSSP_STATE *ntlmssp_state, const char *password)
164 ntlmssp_state->password = NULL;
166 ntlmssp_state->password = talloc_strdup(ntlmssp_state->mem_ctx, password);
167 if (!ntlmssp_state->password) {
168 return NT_STATUS_NO_MEMORY;
175 * Set a domain on an NTLMSSP context - ensures it is talloc()ed
178 NTSTATUS ntlmssp_set_domain(NTLMSSP_STATE *ntlmssp_state, const char *domain)
180 ntlmssp_state->domain = talloc_strdup(ntlmssp_state->mem_ctx, domain ? domain : "" );
181 if (!ntlmssp_state->domain) {
182 return NT_STATUS_NO_MEMORY;
188 * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
191 NTSTATUS ntlmssp_set_workstation(NTLMSSP_STATE *ntlmssp_state, const char *workstation)
193 ntlmssp_state->workstation = talloc_strdup(ntlmssp_state->mem_ctx, workstation);
194 if (!ntlmssp_state->workstation) {
195 return NT_STATUS_NO_MEMORY;
201 * Store a DATA_BLOB containing an NTLMSSP response, for use later.
202 * This copies the data blob
205 NTSTATUS ntlmssp_store_response(NTLMSSP_STATE *ntlmssp_state,
208 ntlmssp_state->stored_response = data_blob_talloc(ntlmssp_state->mem_ctx,
209 response.data, response.length);
214 * Next state function for the NTLMSSP state machine
216 * @param ntlmssp_state NTLMSSP State
217 * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
218 * @param out The reply, as an allocated DATA_BLOB, caller to free.
219 * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
222 NTSTATUS ntlmssp_update(NTLMSSP_STATE *ntlmssp_state,
223 const DATA_BLOB in, DATA_BLOB *out)
226 uint32 ntlmssp_command;
229 if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
230 /* Called update after negotiations finished. */
231 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
232 return NT_STATUS_INVALID_PARAMETER;
235 *out = data_blob(NULL, 0);
237 if (!in.length && ntlmssp_state->stored_response.length) {
238 input = ntlmssp_state->stored_response;
240 /* we only want to read the stored response once - overwrite it */
241 ntlmssp_state->stored_response = data_blob(NULL, 0);
247 switch (ntlmssp_state->role) {
249 ntlmssp_command = NTLMSSP_INITIAL;
252 /* 'datagram' mode - no neg packet */
253 ntlmssp_command = NTLMSSP_NEGOTIATE;
257 if (!msrpc_parse(&input, "Cd",
260 DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
261 dump_data(2, (const char *)input.data, input.length);
262 return NT_STATUS_INVALID_PARAMETER;
266 if (ntlmssp_command != ntlmssp_state->expected_state) {
267 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
268 return NT_STATUS_INVALID_PARAMETER;
271 for (i=0; ntlmssp_callbacks[i].fn; i++) {
272 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
273 && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
274 return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
278 DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
279 ntlmssp_state->role, ntlmssp_command));
281 return NT_STATUS_INVALID_PARAMETER;
285 * End an NTLMSSP state machine
287 * @param ntlmssp_state NTLMSSP State, free()ed by this function
290 void ntlmssp_end(NTLMSSP_STATE **ntlmssp_state)
292 TALLOC_CTX *mem_ctx = (*ntlmssp_state)->mem_ctx;
294 (*ntlmssp_state)->ref_count--;
296 if ((*ntlmssp_state)->ref_count == 0) {
297 data_blob_free(&(*ntlmssp_state)->chal);
298 data_blob_free(&(*ntlmssp_state)->lm_resp);
299 data_blob_free(&(*ntlmssp_state)->nt_resp);
301 talloc_destroy(mem_ctx);
304 *ntlmssp_state = NULL;
309 * Determine correct target name flags for reply, given server role
310 * and negotiated flags
312 * @param ntlmssp_state NTLMSSP State
313 * @param neg_flags The flags from the packet
314 * @param chal_flags The flags to be set in the reply packet
315 * @return The 'target name' string.
318 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
319 uint32 neg_flags, uint32 *chal_flags)
321 if (neg_flags & NTLMSSP_REQUEST_TARGET) {
322 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
323 *chal_flags |= NTLMSSP_REQUEST_TARGET;
324 if (ntlmssp_state->server_role == ROLE_STANDALONE) {
325 *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
326 return ntlmssp_state->get_global_myname();
328 *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
329 return ntlmssp_state->get_domain();
336 static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
337 uint32 neg_flags, BOOL allow_lm) {
338 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
339 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
340 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
341 ntlmssp_state->unicode = True;
343 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
344 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
345 ntlmssp_state->unicode = False;
348 if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
349 /* other end forcing us to use LM */
350 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
351 ntlmssp_state->use_ntlmv2 = False;
353 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
356 if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN) {
357 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
360 if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
361 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
364 if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
365 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
368 if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
369 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
372 if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
373 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
376 if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
377 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
380 if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
381 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
384 /* Woop Woop - unknown flag for Windows compatibility...
385 What does this really do ? JRA. */
386 if (!(neg_flags & NTLMSSP_UNKNOWN_02000000)) {
387 ntlmssp_state->neg_flags &= ~NTLMSSP_UNKNOWN_02000000;
390 if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
391 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
396 Weaken NTLMSSP keys to cope with down-level clients and servers.
398 We probably should have some parameters to control this, but as
399 it only occours for LM_KEY connections, and this is controlled
400 by the client lanman auth/lanman auth parameters, it isn't too bad.
403 DATA_BLOB ntlmssp_weaken_keys(NTLMSSP_STATE *ntlmssp_state, TALLOC_CTX *mem_ctx)
405 DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
406 ntlmssp_state->session_key.data,
407 ntlmssp_state->session_key.length);
409 /* Nothing to weaken. We certainly don't want to 'extend' the length... */
410 if (weakened_key.length < 16) {
411 /* perhaps there was no key? */
415 /* Key weakening not performed on the master key for NTLM2
416 and does not occour for NTLM1. Therefore we only need
417 to do this for the LM_KEY.
420 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
421 /* LM key doesn't support 128 bit crypto, so this is
422 * the best we can do. If you negotiate 128 bit, but
423 * not 56, you end up with 40 bit... */
424 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
425 weakened_key.data[7] = 0xa0;
426 } else { /* forty bits */
427 weakened_key.data[5] = 0xe5;
428 weakened_key.data[6] = 0x38;
429 weakened_key.data[7] = 0xb0;
431 weakened_key.length = 8;
437 * Next state function for the Negotiate packet
439 * @param ntlmssp_state NTLMSSP State
440 * @param request The request, as a DATA_BLOB
441 * @param request The reply, as an allocated DATA_BLOB, caller to free.
442 * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
445 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
446 const DATA_BLOB request, DATA_BLOB *reply)
448 DATA_BLOB struct_blob;
449 fstring dnsname, dnsdomname;
450 uint32 neg_flags = 0;
451 uint32 ntlmssp_command, chal_flags;
452 const uint8 *cryptkey;
453 const char *target_name;
455 /* parse the NTLMSSP packet */
457 file_save("ntlmssp_negotiate.dat", request.data, request.length);
460 if (request.length) {
461 if ((request.length < 16) || !msrpc_parse(&request, "Cdd",
465 DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
466 (unsigned int)request.length));
467 dump_data(2, (const char *)request.data, request.length);
468 return NT_STATUS_INVALID_PARAMETER;
470 debug_ntlmssp_flags(neg_flags);
473 ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
475 /* Ask our caller what challenge they would like in the packet */
476 cryptkey = ntlmssp_state->get_challenge(ntlmssp_state);
478 /* Check if we may set the challenge */
479 if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
480 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
483 /* The flags we send back are not just the negotiated flags,
484 * they are also 'what is in this packet'. Therfore, we
485 * operate on 'chal_flags' from here on
488 chal_flags = ntlmssp_state->neg_flags;
490 /* get the right name to fill in as 'target' */
491 target_name = ntlmssp_target_name(ntlmssp_state,
492 neg_flags, &chal_flags);
493 if (target_name == NULL)
494 return NT_STATUS_INVALID_PARAMETER;
496 ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
497 ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
500 /* This should be a 'netbios domain -> DNS domain' mapping */
501 dnsdomname[0] = '\0';
502 get_mydnsdomname(dnsdomname);
503 strlower_m(dnsdomname);
506 get_mydnsfullname(dnsname);
508 /* This creates the 'blob' of names that appears at the end of the packet */
509 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
511 msrpc_gen(&struct_blob, "aaaaa",
512 NTLMSSP_NAME_TYPE_DOMAIN, target_name,
513 NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
514 NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
515 NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
518 struct_blob = data_blob(NULL, 0);
522 /* Marshel the packet in the right format, be it unicode or ASCII */
523 const char *gen_string;
524 if (ntlmssp_state->unicode) {
525 gen_string = "CdUdbddB";
527 gen_string = "CdAdbddB";
530 msrpc_gen(reply, gen_string,
537 struct_blob.data, struct_blob.length);
540 data_blob_free(&struct_blob);
542 ntlmssp_state->expected_state = NTLMSSP_AUTH;
544 return NT_STATUS_MORE_PROCESSING_REQUIRED;
548 * Next state function for the Authenticate packet
550 * @param ntlmssp_state NTLMSSP State
551 * @param request The request, as a DATA_BLOB
552 * @param request The reply, as an allocated DATA_BLOB, caller to free.
553 * @return Errors or NT_STATUS_OK.
556 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
557 const DATA_BLOB request, DATA_BLOB *reply)
559 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
560 DATA_BLOB user_session_key = data_blob(NULL, 0);
561 DATA_BLOB lm_session_key = data_blob(NULL, 0);
562 DATA_BLOB session_key = data_blob(NULL, 0);
563 uint32 ntlmssp_command, auth_flags;
564 NTSTATUS nt_status = NT_STATUS_OK;
567 BOOL doing_ntlm2 = False;
569 uchar session_nonce[16];
570 uchar session_nonce_hash[16];
572 const char *parse_string;
575 char *workstation = NULL;
577 /* parse the NTLMSSP packet */
578 *reply = data_blob(NULL, 0);
581 file_save("ntlmssp_auth.dat", request.data, request.length);
584 if (ntlmssp_state->unicode) {
585 parse_string = "CdBBUUUBd";
587 parse_string = "CdBBAAABd";
590 data_blob_free(&ntlmssp_state->lm_resp);
591 data_blob_free(&ntlmssp_state->nt_resp);
593 ntlmssp_state->user = NULL;
594 ntlmssp_state->domain = NULL;
595 ntlmssp_state->workstation = NULL;
597 /* now the NTLMSSP encoded auth hashes */
598 if (!msrpc_parse(&request, parse_string,
601 &ntlmssp_state->lm_resp,
602 &ntlmssp_state->nt_resp,
606 &encrypted_session_key,
610 SAFE_FREE(workstation);
611 data_blob_free(&encrypted_session_key);
614 /* Try again with a shorter string (Win9X truncates this packet) */
615 if (ntlmssp_state->unicode) {
616 parse_string = "CdBBUUU";
618 parse_string = "CdBBAAA";
621 /* now the NTLMSSP encoded auth hashes */
622 if (!msrpc_parse(&request, parse_string,
625 &ntlmssp_state->lm_resp,
626 &ntlmssp_state->nt_resp,
630 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
631 dump_data(2, (const char *)request.data, request.length);
634 SAFE_FREE(workstation);
636 return NT_STATUS_INVALID_PARAMETER;
641 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
643 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
646 SAFE_FREE(workstation);
647 data_blob_free(&encrypted_session_key);
651 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
654 SAFE_FREE(workstation);
655 data_blob_free(&encrypted_session_key);
659 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
662 SAFE_FREE(workstation);
663 data_blob_free(&encrypted_session_key);
669 SAFE_FREE(workstation);
671 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
672 ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
675 file_save("nthash1.dat", &ntlmssp_state->nt_resp.data, &ntlmssp_state->nt_resp.length);
676 file_save("lmhash1.dat", &ntlmssp_state->lm_resp.data, &ntlmssp_state->lm_resp.length);
679 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
682 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
684 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
685 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
686 struct MD5Context md5_session_nonce_ctx;
687 SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
691 memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
692 memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
694 MD5Init(&md5_session_nonce_ctx);
695 MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
696 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
698 ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, session_nonce_hash, 8);
700 /* LM response is no longer useful */
701 data_blob_free(&ntlmssp_state->lm_resp);
703 /* We changed the effective challenge - set it */
704 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
705 data_blob_free(&encrypted_session_key);
709 /* LM Key is incompatible. */
710 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
715 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
716 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
717 * smb.conf file) and no NTLMv2 response was sent then the password check
718 * will fail here. JRA.
721 /* Finally, actually ask if the password is OK */
723 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
724 &user_session_key, &lm_session_key))) {
725 data_blob_free(&encrypted_session_key);
729 dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
730 dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
732 /* Handle the different session key derivation for NTLM2 */
734 if (user_session_key.data && user_session_key.length == 16) {
735 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
736 hmac_md5(user_session_key.data, session_nonce,
737 sizeof(session_nonce), session_key.data);
738 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
739 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
742 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
743 session_key = data_blob(NULL, 0);
745 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
746 if (lm_session_key.data && lm_session_key.length >= 8) {
747 if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
748 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
749 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
751 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
752 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
754 /* use the key unmodified - it's
755 * probably a NULL key from the guest
757 session_key = lm_session_key;
760 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
761 session_key = data_blob(NULL, 0);
763 } else if (user_session_key.data) {
764 session_key = user_session_key;
765 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
766 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
767 } else if (lm_session_key.data) {
768 session_key = lm_session_key;
769 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
770 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
772 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
773 session_key = data_blob(NULL, 0);
776 /* With KEY_EXCH, the client supplies the proposed session key,
777 but encrypts it with the long-term key */
778 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
779 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
780 data_blob_free(&encrypted_session_key);
781 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
782 (unsigned int)encrypted_session_key.length));
783 return NT_STATUS_INVALID_PARAMETER;
784 } else if (!session_key.data || session_key.length != 16) {
785 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
786 (unsigned int)session_key.length));
787 ntlmssp_state->session_key = session_key;
789 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
790 SamOEMhash(encrypted_session_key.data,
792 encrypted_session_key.length);
793 ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state->mem_ctx,
794 encrypted_session_key.data,
795 encrypted_session_key.length);
796 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
797 encrypted_session_key.length);
800 ntlmssp_state->session_key = session_key;
803 if (!NT_STATUS_IS_OK(nt_status)) {
804 ntlmssp_state->session_key = data_blob(NULL, 0);
805 } else if (ntlmssp_state->session_key.length) {
806 nt_status = ntlmssp_sign_init(ntlmssp_state);
809 data_blob_free(&encrypted_session_key);
811 /* Only one authentication allowed per server state. */
812 ntlmssp_state->expected_state = NTLMSSP_DONE;
818 * Create an NTLMSSP state machine
820 * @param ntlmssp_state NTLMSSP State, allocated by this function
823 NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
827 mem_ctx = talloc_init("NTLMSSP context");
829 *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
830 if (!*ntlmssp_state) {
831 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
832 talloc_destroy(mem_ctx);
833 return NT_STATUS_NO_MEMORY;
836 (*ntlmssp_state)->role = NTLMSSP_SERVER;
838 (*ntlmssp_state)->mem_ctx = mem_ctx;
839 (*ntlmssp_state)->get_challenge = get_challenge;
840 (*ntlmssp_state)->set_challenge = set_challenge;
841 (*ntlmssp_state)->may_set_challenge = may_set_challenge;
843 (*ntlmssp_state)->get_global_myname = global_myname;
844 (*ntlmssp_state)->get_domain = lp_workgroup;
845 (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
847 (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
849 (*ntlmssp_state)->ref_count = 1;
851 (*ntlmssp_state)->neg_flags =
852 NTLMSSP_NEGOTIATE_128 |
853 NTLMSSP_NEGOTIATE_56 |
854 NTLMSSP_UNKNOWN_02000000 |
855 NTLMSSP_NEGOTIATE_NTLM |
856 NTLMSSP_NEGOTIATE_NTLM2 |
857 NTLMSSP_NEGOTIATE_KEY_EXCH |
858 NTLMSSP_NEGOTIATE_SIGN |
859 NTLMSSP_NEGOTIATE_SEAL;
864 /*********************************************************************
866 *********************************************************************/
869 * Next state function for the Initial packet
871 * @param ntlmssp_state NTLMSSP State
872 * @param request The request, as a DATA_BLOB. reply.data must be NULL
873 * @param request The reply, as an allocated DATA_BLOB, caller to free.
874 * @return Errors or NT_STATUS_OK.
877 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
878 DATA_BLOB reply, DATA_BLOB *next_request)
880 if (ntlmssp_state->unicode) {
881 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
883 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
886 if (ntlmssp_state->use_ntlmv2) {
887 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
890 /* generate the ntlmssp negotiate packet */
891 msrpc_gen(next_request, "CddAA",
894 ntlmssp_state->neg_flags,
895 ntlmssp_state->get_domain(),
896 ntlmssp_state->get_global_myname());
898 ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
900 return NT_STATUS_MORE_PROCESSING_REQUIRED;
904 * Next state function for the Challenge Packet. Generate an auth packet.
906 * @param ntlmssp_state NTLMSSP State
907 * @param request The request, as a DATA_BLOB. reply.data must be NULL
908 * @param request The reply, as an allocated DATA_BLOB, caller to free.
909 * @return Errors or NT_STATUS_OK.
912 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
913 const DATA_BLOB reply, DATA_BLOB *next_request)
915 uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
916 DATA_BLOB server_domain_blob;
917 DATA_BLOB challenge_blob;
918 DATA_BLOB struct_blob = data_blob(NULL, 0);
920 const char *chal_parse_string;
921 const char *auth_gen_string;
922 DATA_BLOB lm_response = data_blob(NULL, 0);
923 DATA_BLOB nt_response = data_blob(NULL, 0);
924 DATA_BLOB session_key = data_blob(NULL, 0);
925 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
926 NTSTATUS nt_status = NT_STATUS_OK;
928 if (!msrpc_parse(&reply, "CdBd",
933 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
934 dump_data(2, (const char *)reply.data, reply.length);
936 return NT_STATUS_INVALID_PARAMETER;
939 data_blob_free(&server_domain_blob);
941 DEBUG(3, ("Got challenge flags:\n"));
942 debug_ntlmssp_flags(chal_flags);
944 ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
946 if (ntlmssp_state->unicode) {
947 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
948 chal_parse_string = "CdUdbddB";
950 chal_parse_string = "CdUdbdd";
952 auth_gen_string = "CdBBUUUBd";
954 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
955 chal_parse_string = "CdAdbddB";
957 chal_parse_string = "CdAdbdd";
960 auth_gen_string = "CdBBAAABd";
963 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
964 debug_ntlmssp_flags(ntlmssp_state->neg_flags);
966 if (!msrpc_parse(&reply, chal_parse_string,
974 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
975 dump_data(2, (const char *)reply.data, reply.length);
976 return NT_STATUS_INVALID_PARAMETER;
979 ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state->mem_ctx,
982 SAFE_FREE(server_domain);
983 if (challenge_blob.length != 8) {
984 data_blob_free(&struct_blob);
985 return NT_STATUS_INVALID_PARAMETER;
988 if (!ntlmssp_state->password) {
989 static const uchar zeros[16];
990 /* do nothing - blobs are zero length */
992 /* session key is all zeros */
993 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, zeros, 16);
995 /* not doing NLTM2 without a password */
996 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
997 } else if (ntlmssp_state->use_ntlmv2) {
999 if (!struct_blob.length) {
1000 /* be lazy, match win2k - we can't do NTLMv2 without it */
1001 DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
1002 return NT_STATUS_INVALID_PARAMETER;
1005 /* TODO: if the remote server is standalone, then we should replace 'domain'
1006 with the server name as supplied above */
1008 if (!SMBNTLMv2encrypt(ntlmssp_state->user,
1009 ntlmssp_state->domain,
1010 ntlmssp_state->password, &challenge_blob,
1012 &lm_response, &nt_response, &session_key)) {
1013 data_blob_free(&challenge_blob);
1014 data_blob_free(&struct_blob);
1015 return NT_STATUS_NO_MEMORY;
1017 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
1018 struct MD5Context md5_session_nonce_ctx;
1020 uchar session_nonce[16];
1021 uchar session_nonce_hash[16];
1022 uchar user_session_key[16];
1023 E_md4hash(ntlmssp_state->password, nt_hash);
1025 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1026 generate_random_buffer(lm_response.data, 8);
1027 memset(lm_response.data+8, 0, 16);
1029 memcpy(session_nonce, challenge_blob.data, 8);
1030 memcpy(&session_nonce[8], lm_response.data, 8);
1032 MD5Init(&md5_session_nonce_ctx);
1033 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1034 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1035 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1037 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1038 DEBUG(5, ("challenge is: \n"));
1039 dump_data(5, (const char *)session_nonce_hash, 8);
1041 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1042 SMBNTencrypt(ntlmssp_state->password,
1046 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1048 SMBsesskeygen_ntv1(nt_hash, NULL, user_session_key);
1049 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1050 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1054 E_deshash(ntlmssp_state->password, lm_hash);
1055 E_md4hash(ntlmssp_state->password, nt_hash);
1057 /* lanman auth is insecure, it may be disabled */
1058 if (lp_client_lanman_auth()) {
1059 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1060 SMBencrypt(ntlmssp_state->password,challenge_blob.data,
1064 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1065 SMBNTencrypt(ntlmssp_state->password,challenge_blob.data,
1068 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1069 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1070 && lp_client_lanman_auth()) {
1071 SMBsesskeygen_lm_sess_key(lm_hash, lm_response.data,
1073 dump_data_pw("LM session key\n", session_key.data, session_key.length);
1075 SMBsesskeygen_ntv1(nt_hash, NULL, session_key.data);
1076 dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1079 data_blob_free(&struct_blob);
1081 /* Key exchange encryptes a new client-generated session key with
1082 the password-derived key */
1083 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1084 /* Make up a new session key */
1085 uint8 client_session_key[16];
1086 generate_random_buffer(client_session_key, sizeof(client_session_key));
1088 /* Encrypt the new session key with the old one */
1089 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1090 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1091 SamOEMhash(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
1092 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1094 /* Mark the new session key as the 'real' session key */
1095 data_blob_free(&session_key);
1096 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, client_session_key, sizeof(client_session_key));
1099 /* this generates the actual auth packet */
1100 if (!msrpc_gen(next_request, auth_gen_string,
1103 lm_response.data, lm_response.length,
1104 nt_response.data, nt_response.length,
1105 ntlmssp_state->domain,
1106 ntlmssp_state->user,
1107 ntlmssp_state->get_global_myname(),
1108 encrypted_session_key.data, encrypted_session_key.length,
1109 ntlmssp_state->neg_flags)) {
1111 return NT_STATUS_NO_MEMORY;
1114 data_blob_free(&encrypted_session_key);
1116 data_blob_free(&ntlmssp_state->chal);
1118 ntlmssp_state->session_key = session_key;
1120 ntlmssp_state->chal = challenge_blob;
1121 ntlmssp_state->lm_resp = lm_response;
1122 ntlmssp_state->nt_resp = nt_response;
1124 ntlmssp_state->expected_state = NTLMSSP_DONE;
1126 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1127 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1133 NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1135 TALLOC_CTX *mem_ctx;
1137 mem_ctx = talloc_init("NTLMSSP Client context");
1139 *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
1140 if (!*ntlmssp_state) {
1141 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1142 talloc_destroy(mem_ctx);
1143 return NT_STATUS_NO_MEMORY;
1146 (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1148 (*ntlmssp_state)->mem_ctx = mem_ctx;
1150 (*ntlmssp_state)->get_global_myname = global_myname;
1151 (*ntlmssp_state)->get_domain = lp_workgroup;
1153 (*ntlmssp_state)->unicode = True;
1155 (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1157 (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1159 (*ntlmssp_state)->ref_count = 1;
1161 (*ntlmssp_state)->neg_flags =
1162 NTLMSSP_NEGOTIATE_128 |
1163 NTLMSSP_NEGOTIATE_NTLM |
1164 NTLMSSP_NEGOTIATE_NTLM2 |
1165 NTLMSSP_NEGOTIATE_KEY_EXCH |
1167 * We need to set this to allow a later SetPassword
1168 * via the SAMR pipe to succeed. Strange.... We could
1169 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
1171 NTLMSSP_NEGOTIATE_SIGN |
1172 NTLMSSP_REQUEST_TARGET;
1174 return NT_STATUS_OK;