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 char *cliname=NULL, *domname=NULL;
423 const uint8 *cryptkey;
424 const char *target_name;
426 /* parse the NTLMSSP packet */
428 file_save("ntlmssp_negotiate.dat", request.data, request.length);
431 if (request.length) {
432 if (!msrpc_parse(&request, "CddAA",
438 DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate:\n"));
439 dump_data(2, (const char *)request.data, request.length);
440 return NT_STATUS_INVALID_PARAMETER;
443 DEBUG(10, ("ntlmssp_server_negotiate: client = %s, domain = %s\n",
444 cliname ? cliname : "", domname ? domname : ""));
449 debug_ntlmssp_flags(neg_flags);
452 ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
454 /* Ask our caller what challenge they would like in the packet */
455 cryptkey = ntlmssp_state->get_challenge(ntlmssp_state);
457 /* Check if we may set the challenge */
458 if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
459 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
462 /* The flags we send back are not just the negotiated flags,
463 * they are also 'what is in this packet'. Therfore, we
464 * operate on 'chal_flags' from here on
467 chal_flags = ntlmssp_state->neg_flags;
469 /* get the right name to fill in as 'target' */
470 target_name = ntlmssp_target_name(ntlmssp_state,
471 neg_flags, &chal_flags);
472 if (target_name == NULL)
473 return NT_STATUS_INVALID_PARAMETER;
475 ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
476 ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
479 /* This should be a 'netbios domain -> DNS domain' mapping */
480 dnsdomname[0] = '\0';
481 get_mydnsdomname(dnsdomname);
482 strlower_m(dnsdomname);
485 get_mydnsfullname(dnsname);
487 /* This creates the 'blob' of names that appears at the end of the packet */
488 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
490 msrpc_gen(&struct_blob, "aaaaa",
491 NTLMSSP_NAME_TYPE_DOMAIN, target_name,
492 NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
493 NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
494 NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
497 struct_blob = data_blob(NULL, 0);
501 /* Marshel the packet in the right format, be it unicode or ASCII */
502 const char *gen_string;
503 if (ntlmssp_state->unicode) {
504 gen_string = "CdUdbddB";
506 gen_string = "CdAdbddB";
509 msrpc_gen(reply, gen_string,
516 struct_blob.data, struct_blob.length);
519 data_blob_free(&struct_blob);
521 ntlmssp_state->expected_state = NTLMSSP_AUTH;
523 return NT_STATUS_MORE_PROCESSING_REQUIRED;
527 * Next state function for the Authenticate packet
529 * @param ntlmssp_state NTLMSSP State
530 * @param request The request, as a DATA_BLOB
531 * @param request The reply, as an allocated DATA_BLOB, caller to free.
532 * @return Errors or NT_STATUS_OK.
535 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
536 const DATA_BLOB request, DATA_BLOB *reply)
538 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
539 DATA_BLOB user_session_key = data_blob(NULL, 0);
540 DATA_BLOB lm_session_key = data_blob(NULL, 0);
541 DATA_BLOB session_key = data_blob(NULL, 0);
542 uint32 ntlmssp_command, auth_flags;
543 NTSTATUS nt_status = NT_STATUS_OK;
546 BOOL doing_ntlm2 = False;
548 uchar session_nonce[16];
549 uchar session_nonce_hash[16];
551 const char *parse_string;
554 char *workstation = NULL;
556 /* parse the NTLMSSP packet */
557 *reply = data_blob(NULL, 0);
560 file_save("ntlmssp_auth.dat", request.data, request.length);
563 if (ntlmssp_state->unicode) {
564 parse_string = "CdBBUUUBd";
566 parse_string = "CdBBAAABd";
569 data_blob_free(&ntlmssp_state->lm_resp);
570 data_blob_free(&ntlmssp_state->nt_resp);
572 ntlmssp_state->user = NULL;
573 ntlmssp_state->domain = NULL;
574 ntlmssp_state->workstation = NULL;
576 /* now the NTLMSSP encoded auth hashes */
577 if (!msrpc_parse(&request, parse_string,
580 &ntlmssp_state->lm_resp,
581 &ntlmssp_state->nt_resp,
585 &encrypted_session_key,
589 SAFE_FREE(workstation);
590 data_blob_free(&encrypted_session_key);
593 /* Try again with a shorter string (Win9X truncates this packet) */
594 if (ntlmssp_state->unicode) {
595 parse_string = "CdBBUUU";
597 parse_string = "CdBBAAA";
600 /* now the NTLMSSP encoded auth hashes */
601 if (!msrpc_parse(&request, parse_string,
604 &ntlmssp_state->lm_resp,
605 &ntlmssp_state->nt_resp,
609 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
610 dump_data(2, (const char *)request.data, request.length);
613 SAFE_FREE(workstation);
615 return NT_STATUS_INVALID_PARAMETER;
620 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
622 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
625 SAFE_FREE(workstation);
626 data_blob_free(&encrypted_session_key);
630 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
633 SAFE_FREE(workstation);
634 data_blob_free(&encrypted_session_key);
638 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
641 SAFE_FREE(workstation);
642 data_blob_free(&encrypted_session_key);
648 SAFE_FREE(workstation);
650 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
651 ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
654 file_save("nthash1.dat", &ntlmssp_state->nt_resp.data, &ntlmssp_state->nt_resp.length);
655 file_save("lmhash1.dat", &ntlmssp_state->lm_resp.data, &ntlmssp_state->lm_resp.length);
658 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
661 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
663 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
664 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
665 struct MD5Context md5_session_nonce_ctx;
666 SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
670 memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
671 memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
673 MD5Init(&md5_session_nonce_ctx);
674 MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
675 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
677 ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, session_nonce_hash, 8);
679 /* LM response is no longer useful */
680 data_blob_free(&ntlmssp_state->lm_resp);
682 /* We changed the effective challenge - set it */
683 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
684 data_blob_free(&encrypted_session_key);
688 /* LM Key is incompatible. */
689 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
694 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
695 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
696 * smb.conf file) and no NTLMv2 response was sent then the password check
697 * will fail here. JRA.
700 /* Finally, actually ask if the password is OK */
702 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
703 &user_session_key, &lm_session_key))) {
704 data_blob_free(&encrypted_session_key);
708 dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
709 dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
711 /* Handle the different session key derivation for NTLM2 */
713 if (user_session_key.data && user_session_key.length == 16) {
714 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
715 hmac_md5(user_session_key.data, session_nonce,
716 sizeof(session_nonce), session_key.data);
717 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
718 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
721 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
722 session_key = data_blob(NULL, 0);
724 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
725 if (lm_session_key.data && lm_session_key.length >= 8) {
726 if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
727 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
728 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
730 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
731 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
733 /* use the key unmodified - it's
734 * probably a NULL key from the guest
736 session_key = lm_session_key;
739 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
740 session_key = data_blob(NULL, 0);
742 } else if (user_session_key.data) {
743 session_key = user_session_key;
744 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
745 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
746 } else if (lm_session_key.data) {
747 session_key = lm_session_key;
748 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
749 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
751 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
752 session_key = data_blob(NULL, 0);
755 /* With KEY_EXCH, the client supplies the proposed session key,
756 but encrypts it with the long-term key */
757 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
758 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
759 data_blob_free(&encrypted_session_key);
760 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
761 (unsigned int)encrypted_session_key.length));
762 return NT_STATUS_INVALID_PARAMETER;
763 } else if (!session_key.data || session_key.length != 16) {
764 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
765 (unsigned int)session_key.length));
766 ntlmssp_state->session_key = session_key;
768 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
769 SamOEMhash(encrypted_session_key.data,
771 encrypted_session_key.length);
772 ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state->mem_ctx,
773 encrypted_session_key.data,
774 encrypted_session_key.length);
775 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
776 encrypted_session_key.length);
779 ntlmssp_state->session_key = session_key;
782 /* The client might need us to use a partial-strength session key */
783 ntlmssp_weaken_keys(ntlmssp_state);
785 if (!NT_STATUS_IS_OK(nt_status)) {
786 ntlmssp_state->session_key = data_blob(NULL, 0);
787 } else if (ntlmssp_state->session_key.length) {
788 nt_status = ntlmssp_sign_init(ntlmssp_state);
791 data_blob_free(&encrypted_session_key);
793 /* Only one authentication allowed per server state. */
794 ntlmssp_state->expected_state = NTLMSSP_DONE;
800 * Create an NTLMSSP state machine
802 * @param ntlmssp_state NTLMSSP State, allocated by this function
805 NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
809 mem_ctx = talloc_init("NTLMSSP context");
811 *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
812 if (!*ntlmssp_state) {
813 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
814 talloc_destroy(mem_ctx);
815 return NT_STATUS_NO_MEMORY;
818 (*ntlmssp_state)->role = NTLMSSP_SERVER;
820 (*ntlmssp_state)->mem_ctx = mem_ctx;
821 (*ntlmssp_state)->get_challenge = get_challenge;
822 (*ntlmssp_state)->set_challenge = set_challenge;
823 (*ntlmssp_state)->may_set_challenge = may_set_challenge;
825 (*ntlmssp_state)->get_global_myname = global_myname;
826 (*ntlmssp_state)->get_domain = lp_workgroup;
827 (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
829 (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
831 (*ntlmssp_state)->ref_count = 1;
833 (*ntlmssp_state)->neg_flags =
834 NTLMSSP_NEGOTIATE_128 |
835 NTLMSSP_NEGOTIATE_NTLM |
836 NTLMSSP_NEGOTIATE_NTLM2 |
837 NTLMSSP_NEGOTIATE_KEY_EXCH |
838 NTLMSSP_NEGOTIATE_SIGN |
839 NTLMSSP_NEGOTIATE_SEAL;
844 /*********************************************************************
846 *********************************************************************/
849 * Next state function for the Initial packet
851 * @param ntlmssp_state NTLMSSP State
852 * @param request The request, as a DATA_BLOB. reply.data must be NULL
853 * @param request The reply, as an allocated DATA_BLOB, caller to free.
854 * @return Errors or NT_STATUS_OK.
857 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
858 DATA_BLOB reply, DATA_BLOB *next_request)
860 if (ntlmssp_state->unicode) {
861 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
863 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
866 if (ntlmssp_state->use_ntlmv2) {
867 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
870 /* generate the ntlmssp negotiate packet */
871 msrpc_gen(next_request, "CddAA",
874 ntlmssp_state->neg_flags,
875 ntlmssp_state->get_domain(),
876 ntlmssp_state->get_global_myname());
878 ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
880 return NT_STATUS_MORE_PROCESSING_REQUIRED;
884 * Next state function for the Challenge Packet. Generate an auth packet.
886 * @param ntlmssp_state NTLMSSP State
887 * @param request The request, as a DATA_BLOB. reply.data must be NULL
888 * @param request The reply, as an allocated DATA_BLOB, caller to free.
889 * @return Errors or NT_STATUS_OK.
892 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
893 const DATA_BLOB reply, DATA_BLOB *next_request)
895 uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
896 DATA_BLOB server_domain_blob;
897 DATA_BLOB challenge_blob;
898 DATA_BLOB struct_blob = data_blob(NULL, 0);
900 const char *chal_parse_string;
901 const char *auth_gen_string;
902 DATA_BLOB lm_response = data_blob(NULL, 0);
903 DATA_BLOB nt_response = data_blob(NULL, 0);
904 DATA_BLOB session_key = data_blob(NULL, 0);
905 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
906 NTSTATUS nt_status = NT_STATUS_OK;
908 if (!msrpc_parse(&reply, "CdBd",
913 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
914 dump_data(2, (const char *)reply.data, reply.length);
916 return NT_STATUS_INVALID_PARAMETER;
919 data_blob_free(&server_domain_blob);
921 DEBUG(3, ("Got challenge flags:\n"));
922 debug_ntlmssp_flags(chal_flags);
924 ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
926 if (ntlmssp_state->unicode) {
927 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
928 chal_parse_string = "CdUdbddB";
930 chal_parse_string = "CdUdbdd";
932 auth_gen_string = "CdBBUUUBd";
934 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
935 chal_parse_string = "CdAdbddB";
937 chal_parse_string = "CdAdbdd";
940 auth_gen_string = "CdBBAAABd";
943 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
944 debug_ntlmssp_flags(ntlmssp_state->neg_flags);
946 if (!msrpc_parse(&reply, chal_parse_string,
954 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
955 dump_data(2, (const char *)reply.data, reply.length);
956 return NT_STATUS_INVALID_PARAMETER;
959 ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state->mem_ctx,
962 SAFE_FREE(server_domain);
963 if (challenge_blob.length != 8) {
964 data_blob_free(&struct_blob);
965 return NT_STATUS_INVALID_PARAMETER;
968 if (!ntlmssp_state->password) {
969 static const uchar zeros[16];
970 /* do nothing - blobs are zero length */
972 /* session key is all zeros */
973 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, zeros, 16);
975 /* not doing NLTM2 without a password */
976 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
977 } else if (ntlmssp_state->use_ntlmv2) {
979 if (!struct_blob.length) {
980 /* be lazy, match win2k - we can't do NTLMv2 without it */
981 DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
982 return NT_STATUS_INVALID_PARAMETER;
985 /* TODO: if the remote server is standalone, then we should replace 'domain'
986 with the server name as supplied above */
988 if (!SMBNTLMv2encrypt(ntlmssp_state->user,
989 ntlmssp_state->domain,
990 ntlmssp_state->password, &challenge_blob,
992 &lm_response, &nt_response, &session_key)) {
993 data_blob_free(&challenge_blob);
994 data_blob_free(&struct_blob);
995 return NT_STATUS_NO_MEMORY;
997 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
998 struct MD5Context md5_session_nonce_ctx;
1000 uchar session_nonce[16];
1001 uchar session_nonce_hash[16];
1002 uchar user_session_key[16];
1003 E_md4hash(ntlmssp_state->password, nt_hash);
1005 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1006 generate_random_buffer(lm_response.data, 8);
1007 memset(lm_response.data+8, 0, 16);
1009 memcpy(session_nonce, challenge_blob.data, 8);
1010 memcpy(&session_nonce[8], lm_response.data, 8);
1012 MD5Init(&md5_session_nonce_ctx);
1013 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
1014 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
1015 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
1017 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
1018 DEBUG(5, ("challenge is: \n"));
1019 dump_data(5, (const char *)session_nonce_hash, 8);
1021 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1022 SMBNTencrypt(ntlmssp_state->password,
1026 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1028 SMBsesskeygen_ntv1(nt_hash, NULL, user_session_key);
1029 hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
1030 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
1034 E_deshash(ntlmssp_state->password, lm_hash);
1035 E_md4hash(ntlmssp_state->password, nt_hash);
1037 /* lanman auth is insecure, it may be disabled */
1038 if (lp_client_lanman_auth()) {
1039 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1040 SMBencrypt(ntlmssp_state->password,challenge_blob.data,
1044 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1045 SMBNTencrypt(ntlmssp_state->password,challenge_blob.data,
1048 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1049 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1050 && lp_client_lanman_auth()) {
1051 SMBsesskeygen_lm_sess_key(lm_hash, lm_response.data,
1053 dump_data_pw("LM session key\n", session_key.data, session_key.length);
1055 SMBsesskeygen_ntv1(nt_hash, NULL, session_key.data);
1056 dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1059 data_blob_free(&struct_blob);
1061 /* Key exchange encryptes a new client-generated session key with
1062 the password-derived key */
1063 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1064 /* Make up a new session key */
1065 uint8 client_session_key[16];
1066 generate_random_buffer(client_session_key, sizeof(client_session_key));
1068 /* Encrypt the new session key with the old one */
1069 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1070 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1071 SamOEMhash(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
1072 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1074 /* Mark the new session key as the 'real' session key */
1075 data_blob_free(&session_key);
1076 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, client_session_key, sizeof(client_session_key));
1079 /* this generates the actual auth packet */
1080 if (!msrpc_gen(next_request, auth_gen_string,
1083 lm_response.data, lm_response.length,
1084 nt_response.data, nt_response.length,
1085 ntlmssp_state->domain,
1086 ntlmssp_state->user,
1087 ntlmssp_state->get_global_myname(),
1088 encrypted_session_key.data, encrypted_session_key.length,
1089 ntlmssp_state->neg_flags)) {
1091 return NT_STATUS_NO_MEMORY;
1094 data_blob_free(&encrypted_session_key);
1096 data_blob_free(&ntlmssp_state->chal);
1098 ntlmssp_state->session_key = session_key;
1100 /* The client might be using 56 or 40 bit weakened keys */
1101 ntlmssp_weaken_keys(ntlmssp_state);
1103 ntlmssp_state->chal = challenge_blob;
1104 ntlmssp_state->lm_resp = lm_response;
1105 ntlmssp_state->nt_resp = nt_response;
1107 ntlmssp_state->expected_state = NTLMSSP_DONE;
1109 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1110 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1116 NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1118 TALLOC_CTX *mem_ctx;
1120 mem_ctx = talloc_init("NTLMSSP Client context");
1122 *ntlmssp_state = TALLOC_ZERO_P(mem_ctx, NTLMSSP_STATE);
1123 if (!*ntlmssp_state) {
1124 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1125 talloc_destroy(mem_ctx);
1126 return NT_STATUS_NO_MEMORY;
1129 (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1131 (*ntlmssp_state)->mem_ctx = mem_ctx;
1133 (*ntlmssp_state)->get_global_myname = global_myname;
1134 (*ntlmssp_state)->get_domain = lp_workgroup;
1136 (*ntlmssp_state)->unicode = True;
1138 (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1140 (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1142 (*ntlmssp_state)->ref_count = 1;
1144 (*ntlmssp_state)->neg_flags =
1145 NTLMSSP_NEGOTIATE_128 |
1146 NTLMSSP_NEGOTIATE_NTLM |
1147 NTLMSSP_NEGOTIATE_NTLM2 |
1148 NTLMSSP_NEGOTIATE_KEY_EXCH |
1150 * We need to set this to allow a later SetPassword
1151 * via the SAMR pipe to succeed. Strange.... We could
1152 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
1154 NTLMSSP_NEGOTIATE_SIGN |
1155 NTLMSSP_REQUEST_TARGET;
1157 return NT_STATUS_OK;