2 Unix SMB/Netbios implementation.
4 handle NLTMSSP, server side
6 Copyright (C) Andrew Tridgell 2001
7 Copyright (C) Andrew Bartlett 2001-2003
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
27 DATA_BLOB reply, DATA_BLOB *next_request);
28 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
29 const DATA_BLOB in, DATA_BLOB *out);
30 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
31 const DATA_BLOB reply, DATA_BLOB *next_request);
32 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
33 const DATA_BLOB request, DATA_BLOB *reply);
36 * Callbacks for NTLMSSP - for both client and server operating modes
40 static const struct ntlmssp_callbacks {
41 enum NTLMSSP_ROLE role;
42 enum NTLM_MESSAGE_TYPE ntlmssp_command;
43 NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
44 DATA_BLOB in, DATA_BLOB *out);
45 } ntlmssp_callbacks[] = {
46 {NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
47 {NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
48 {NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
49 {NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
50 {NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
51 {NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
56 * Print out the NTLMSSP flags for debugging
57 * @param neg_flags The flags from the packet
60 void debug_ntlmssp_flags(uint32 neg_flags)
62 DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
64 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
65 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_UNICODE\n"));
66 if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
67 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM\n"));
68 if (neg_flags & NTLMSSP_REQUEST_TARGET)
69 DEBUGADD(4, (" NTLMSSP_REQUEST_TARGET\n"));
70 if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
71 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SIGN\n"));
72 if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
73 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SEAL\n"));
74 if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
75 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_LM_KEY\n"));
76 if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
77 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NETWARE\n"));
78 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
79 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM\n"));
80 if (neg_flags & NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED)
81 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED\n"));
82 if (neg_flags & NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED)
83 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED\n"));
84 if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
85 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
86 if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
87 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
88 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
89 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM2\n"));
90 if (neg_flags & NTLMSSP_CHAL_TARGET_INFO)
91 DEBUGADD(4, (" NTLMSSP_CHAL_TARGET_INFO\n"));
92 if (neg_flags & NTLMSSP_NEGOTIATE_128)
93 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_128\n"));
94 if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
95 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
99 * Default challenge generation code.
103 static const uint8 *get_challenge(const struct ntlmssp_state *ntlmssp_state)
105 static uchar chal[8];
106 generate_random_buffer(chal, sizeof(chal), False);
112 * Default 'we can set the challenge to anything we like' implementation
116 static BOOL may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
122 * Default 'we can set the challenge to anything we like' implementation
124 * Does not actually do anything, as the value is always in the structure anyway.
128 static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
130 SMB_ASSERT(challenge->length == 8);
135 * Set a username on an NTLMSSP context - ensures it is talloc()ed
139 NTSTATUS ntlmssp_set_username(NTLMSSP_STATE *ntlmssp_state, const char *user)
141 ntlmssp_state->user = talloc_strdup(ntlmssp_state->mem_ctx, user);
142 if (!ntlmssp_state->user) {
143 return NT_STATUS_NO_MEMORY;
149 * Set a password on an NTLMSSP context - ensures it is talloc()ed
152 NTSTATUS ntlmssp_set_password(NTLMSSP_STATE *ntlmssp_state, const char *password)
155 ntlmssp_state->password = NULL;
157 ntlmssp_state->password = talloc_strdup(ntlmssp_state->mem_ctx, password);
158 if (!ntlmssp_state->password) {
159 return NT_STATUS_NO_MEMORY;
166 * Set a domain on an NTLMSSP context - ensures it is talloc()ed
169 NTSTATUS ntlmssp_set_domain(NTLMSSP_STATE *ntlmssp_state, const char *domain)
171 /* Possibly make our NTLMv2 client more robust by always having
172 an uppercase domain */
173 ntlmssp_state->domain = talloc_strdup_upper(ntlmssp_state->mem_ctx, domain);
174 if (!ntlmssp_state->domain) {
175 return NT_STATUS_NO_MEMORY;
181 * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
184 NTSTATUS ntlmssp_set_workstation(NTLMSSP_STATE *ntlmssp_state, const char *workstation)
186 ntlmssp_state->workstation = talloc_strdup(ntlmssp_state->mem_ctx, workstation);
187 if (!ntlmssp_state->domain) {
188 return NT_STATUS_NO_MEMORY;
194 * Store a DATA_BLOB containing an NTLMSSP response, for use later.
195 * This copies the data blob
198 NTSTATUS ntlmssp_store_response(NTLMSSP_STATE *ntlmssp_state,
201 ntlmssp_state->stored_response = data_blob_talloc(ntlmssp_state->mem_ctx,
202 response.data, response.length);
207 * Next state function for the NTLMSSP state machine
209 * @param ntlmssp_state NTLMSSP State
210 * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
211 * @param out The reply, as an allocated DATA_BLOB, caller to free.
212 * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
215 NTSTATUS ntlmssp_update(NTLMSSP_STATE *ntlmssp_state,
216 const DATA_BLOB in, DATA_BLOB *out)
219 uint32 ntlmssp_command;
222 *out = data_blob(NULL, 0);
224 if (!in.length && ntlmssp_state->stored_response.length) {
225 input = ntlmssp_state->stored_response;
227 /* we only want to read the stored response once - overwrite it */
228 ntlmssp_state->stored_response = data_blob(NULL, 0);
234 switch (ntlmssp_state->role) {
236 ntlmssp_command = NTLMSSP_INITIAL;
239 /* 'datagram' mode - no neg packet */
240 ntlmssp_command = NTLMSSP_NEGOTIATE;
244 if (!msrpc_parse(&input, "Cd",
247 DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
248 dump_data(2, (const char *)input.data, input.length);
249 return NT_STATUS_INVALID_PARAMETER;
253 if (ntlmssp_command != ntlmssp_state->expected_state) {
254 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
255 return NT_STATUS_INVALID_PARAMETER;
258 for (i=0; ntlmssp_callbacks[i].fn; i++) {
259 if (ntlmssp_callbacks[i].role == ntlmssp_state->role
260 && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
261 return ntlmssp_callbacks[i].fn(ntlmssp_state, input, out);
265 DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
266 ntlmssp_state->role, ntlmssp_command));
268 return NT_STATUS_INVALID_PARAMETER;
272 * End an NTLMSSP state machine
274 * @param ntlmssp_state NTLMSSP State, free()ed by this function
277 void ntlmssp_end(NTLMSSP_STATE **ntlmssp_state)
279 TALLOC_CTX *mem_ctx = (*ntlmssp_state)->mem_ctx;
281 (*ntlmssp_state)->ref_count--;
283 if ((*ntlmssp_state)->ref_count == 0) {
284 data_blob_free(&(*ntlmssp_state)->chal);
285 data_blob_free(&(*ntlmssp_state)->lm_resp);
286 data_blob_free(&(*ntlmssp_state)->nt_resp);
288 talloc_destroy(mem_ctx);
291 *ntlmssp_state = NULL;
296 * Determine correct target name flags for reply, given server role
297 * and negotiated flags
299 * @param ntlmssp_state NTLMSSP State
300 * @param neg_flags The flags from the packet
301 * @param chal_flags The flags to be set in the reply packet
302 * @return The 'target name' string.
305 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
306 uint32 neg_flags, uint32 *chal_flags)
308 if (neg_flags & NTLMSSP_REQUEST_TARGET) {
309 *chal_flags |= NTLMSSP_CHAL_TARGET_INFO;
310 *chal_flags |= NTLMSSP_REQUEST_TARGET;
311 if (ntlmssp_state->server_role == ROLE_STANDALONE) {
312 *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
313 return ntlmssp_state->get_global_myname();
315 *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
316 return ntlmssp_state->get_domain();
323 static void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
324 uint32 neg_flags, BOOL allow_lm) {
325 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
326 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
327 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
328 ntlmssp_state->unicode = True;
330 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
331 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
332 ntlmssp_state->unicode = False;
335 if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm) {
336 /* other end forcing us to use LM */
337 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
338 ntlmssp_state->use_ntlmv2 = False;
340 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
343 if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN) {
344 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
347 if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
348 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
351 if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
352 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
355 if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
356 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
359 if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
360 ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
367 * Next state function for the Negotiate packet
369 * @param ntlmssp_state NTLMSSP State
370 * @param request The request, as a DATA_BLOB
371 * @param request The reply, as an allocated DATA_BLOB, caller to free.
372 * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
375 static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
376 const DATA_BLOB request, DATA_BLOB *reply)
378 DATA_BLOB struct_blob;
379 fstring dnsname, dnsdomname;
380 uint32 neg_flags = 0;
381 uint32 ntlmssp_command, chal_flags;
382 char *cliname=NULL, *domname=NULL;
383 const uint8 *cryptkey;
384 const char *target_name;
386 /* parse the NTLMSSP packet */
388 file_save("ntlmssp_negotiate.dat", request.data, request.length);
391 if (request.length) {
392 if (!msrpc_parse(&request, "CddAA",
398 DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP:\n"));
399 dump_data(2, (const char *)request.data, request.length);
400 return NT_STATUS_INVALID_PARAMETER;
406 debug_ntlmssp_flags(neg_flags);
409 ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, lp_lanman_auth());
411 /* Ask our caller what challenge they would like in the packet */
412 cryptkey = ntlmssp_state->get_challenge(ntlmssp_state);
414 /* Check if we may set the challenge */
415 if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
416 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
419 /* The flags we send back are not just the negotiated flags,
420 * they are also 'what is in this packet'. Therfore, we
421 * operate on 'chal_flags' from here on
424 chal_flags = ntlmssp_state->neg_flags;
426 /* get the right name to fill in as 'target' */
427 target_name = ntlmssp_target_name(ntlmssp_state,
428 neg_flags, &chal_flags);
429 if (target_name == NULL)
430 return NT_STATUS_INVALID_PARAMETER;
432 ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
433 ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state->mem_ctx, cryptkey, 8);
436 /* This should be a 'netbios domain -> DNS domain' mapping */
437 dnsdomname[0] = '\0';
438 get_mydnsdomname(dnsdomname);
439 strlower_m(dnsdomname);
442 get_mydnsfullname(dnsname);
444 /* This creates the 'blob' of names that appears at the end of the packet */
445 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO)
447 const char *target_name_dns = "";
448 if (chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN) {
449 target_name_dns = dnsdomname;
450 } else if (chal_flags |= NTLMSSP_TARGET_TYPE_SERVER) {
451 target_name_dns = dnsname;
454 msrpc_gen(&struct_blob, "aaaaa",
455 NTLMSSP_NAME_TYPE_DOMAIN, target_name,
456 NTLMSSP_NAME_TYPE_SERVER, ntlmssp_state->get_global_myname(),
457 NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
458 NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
461 struct_blob = data_blob(NULL, 0);
465 /* Marshel the packet in the right format, be it unicode or ASCII */
466 const char *gen_string;
467 if (ntlmssp_state->unicode) {
468 gen_string = "CdUdbddB";
470 gen_string = "CdAdbddB";
473 msrpc_gen(reply, gen_string,
480 struct_blob.data, struct_blob.length);
483 data_blob_free(&struct_blob);
485 ntlmssp_state->expected_state = NTLMSSP_AUTH;
487 return NT_STATUS_MORE_PROCESSING_REQUIRED;
491 * Next state function for the Authenticate packet
493 * @param ntlmssp_state NTLMSSP State
494 * @param request The request, as a DATA_BLOB
495 * @param request The reply, as an allocated DATA_BLOB, caller to free.
496 * @return Errors or NT_STATUS_OK.
499 static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
500 const DATA_BLOB request, DATA_BLOB *reply)
502 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
503 DATA_BLOB nt_session_key = data_blob(NULL, 0);
504 DATA_BLOB lm_session_key = data_blob(NULL, 0);
505 DATA_BLOB session_key = data_blob(NULL, 0);
506 uint32 ntlmssp_command, auth_flags;
510 BOOL doing_ntlm2 = False;
512 uchar session_nonce[16];
513 uchar session_nonce_hash[16];
515 const char *parse_string;
518 char *workstation = NULL;
520 /* parse the NTLMSSP packet */
521 *reply = data_blob(NULL, 0);
524 file_save("ntlmssp_auth.dat", request.data, request.length);
527 if (ntlmssp_state->unicode) {
528 parse_string = "CdBBUUUBd";
530 parse_string = "CdBBAAABd";
533 data_blob_free(&ntlmssp_state->lm_resp);
534 data_blob_free(&ntlmssp_state->nt_resp);
536 ntlmssp_state->user = NULL;
537 ntlmssp_state->domain = NULL;
538 ntlmssp_state->workstation = NULL;
540 /* now the NTLMSSP encoded auth hashes */
541 if (!msrpc_parse(&request, parse_string,
544 &ntlmssp_state->lm_resp,
545 &ntlmssp_state->nt_resp,
549 &encrypted_session_key,
551 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
552 dump_data(2, (const char *)request.data, request.length);
555 SAFE_FREE(workstation);
556 data_blob_free(&encrypted_session_key);
559 /* Try again with a shorter string (Win9X truncates this packet) */
560 if (ntlmssp_state->unicode) {
561 parse_string = "CdBBUUU";
563 parse_string = "CdBBAAA";
566 /* now the NTLMSSP encoded auth hashes */
567 if (!msrpc_parse(&request, parse_string,
570 &ntlmssp_state->lm_resp,
571 &ntlmssp_state->nt_resp,
575 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
576 dump_data(2, (const char *)request.data, request.length);
579 SAFE_FREE(workstation);
581 return NT_STATUS_INVALID_PARAMETER;
586 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, lp_lanman_auth());
588 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
591 SAFE_FREE(workstation);
592 data_blob_free(&encrypted_session_key);
596 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
599 SAFE_FREE(workstation);
600 data_blob_free(&encrypted_session_key);
604 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
607 SAFE_FREE(workstation);
608 data_blob_free(&encrypted_session_key);
614 SAFE_FREE(workstation);
616 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
617 ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
620 file_save("nthash1.dat", &ntlmssp_state->nt_resp.data, &ntlmssp_state->nt_resp.length);
621 file_save("lmhash1.dat", &ntlmssp_state->lm_resp.data, &ntlmssp_state->lm_resp.length);
624 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
627 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
629 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
630 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
631 struct MD5Context md5_session_nonce_ctx;
632 SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
636 memcpy(session_nonce, ntlmssp_state->internal_chal.data, 8);
637 memcpy(&session_nonce[8], ntlmssp_state->lm_resp.data, 8);
639 MD5Init(&md5_session_nonce_ctx);
640 MD5Update(&md5_session_nonce_ctx, session_nonce, 16);
641 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
643 ntlmssp_state->chal = data_blob_talloc(ntlmssp_state->mem_ctx, session_nonce_hash, 8);
645 /* LM response is no longer useful */
646 data_blob_free(&ntlmssp_state->lm_resp);
648 /* We changed the effective challenge - set it */
649 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
650 data_blob_free(&encrypted_session_key);
657 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
658 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
659 * smb.conf file) and no NTLMv2 response was sent then the password check
660 * will fail here. JRA.
663 /* Finally, actually ask if the password is OK */
665 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->check_password(ntlmssp_state,
666 &nt_session_key, &lm_session_key))) {
667 data_blob_free(&encrypted_session_key);
671 dump_data_pw("NT session key:\n", nt_session_key.data, nt_session_key.length);
672 dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
674 /* Handle the different session key derivation for NTLM2 */
676 if (nt_session_key.data && nt_session_key.length == 16) {
677 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
678 hmac_md5(nt_session_key.data, session_nonce,
679 sizeof(session_nonce), session_key.data);
680 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
681 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
684 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
685 session_key = data_blob(NULL, 0);
687 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
688 if (lm_session_key.data && lm_session_key.length >= 8) {
689 if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
690 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
691 SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
693 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
694 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
696 /* use the key unmodified - it's
697 * probably a NULL key from the guest
699 session_key = lm_session_key;
702 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
703 session_key = data_blob(NULL, 0);
705 } else if (nt_session_key.data) {
706 session_key = nt_session_key;
707 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
708 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
709 } else if (lm_session_key.data) {
710 session_key = lm_session_key;
711 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
712 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
714 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
715 session_key = data_blob(NULL, 0);
718 /* With KEY_EXCH, the client supplies the proposed session key,
719 but encrypts it with the long-term key */
720 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
721 if (!encrypted_session_key.data || encrypted_session_key.length != 16) {
722 data_blob_free(&encrypted_session_key);
723 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
724 encrypted_session_key.length));
725 return NT_STATUS_INVALID_PARAMETER;
726 } else if (!session_key.data || session_key.length != 16) {
727 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
728 session_key.length));
729 ntlmssp_state->session_key = session_key;
731 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
732 SamOEMhash(encrypted_session_key.data,
734 encrypted_session_key.length);
735 ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state->mem_ctx,
736 encrypted_session_key.data,
737 encrypted_session_key.length);
738 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data,
739 encrypted_session_key.length);
742 ntlmssp_state->session_key = session_key;
745 if (!NT_STATUS_IS_OK(nt_status)) {
746 ntlmssp_state->session_key = data_blob(NULL, 0);
747 } else if (ntlmssp_state->session_key.length) {
748 nt_status = ntlmssp_sign_init(ntlmssp_state);
751 data_blob_free(&encrypted_session_key);
753 /* allow arbitarily many authentications */
754 ntlmssp_state->expected_state = NTLMSSP_AUTH;
760 * Create an NTLMSSP state machine
762 * @param ntlmssp_state NTLMSSP State, allocated by this function
765 NTSTATUS ntlmssp_server_start(NTLMSSP_STATE **ntlmssp_state)
769 mem_ctx = talloc_init("NTLMSSP context");
771 *ntlmssp_state = talloc_zero(mem_ctx, sizeof(**ntlmssp_state));
772 if (!*ntlmssp_state) {
773 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
774 talloc_destroy(mem_ctx);
775 return NT_STATUS_NO_MEMORY;
778 (*ntlmssp_state)->role = NTLMSSP_SERVER;
780 (*ntlmssp_state)->mem_ctx = mem_ctx;
781 (*ntlmssp_state)->get_challenge = get_challenge;
782 (*ntlmssp_state)->set_challenge = set_challenge;
783 (*ntlmssp_state)->may_set_challenge = may_set_challenge;
785 (*ntlmssp_state)->get_global_myname = global_myname;
786 (*ntlmssp_state)->get_domain = lp_workgroup;
787 (*ntlmssp_state)->server_role = ROLE_DOMAIN_MEMBER; /* a good default */
789 (*ntlmssp_state)->expected_state = NTLMSSP_NEGOTIATE;
791 (*ntlmssp_state)->ref_count = 1;
793 (*ntlmssp_state)->neg_flags =
794 NTLMSSP_NEGOTIATE_128 |
795 NTLMSSP_NEGOTIATE_NTLM |
796 NTLMSSP_NEGOTIATE_NTLM2 |
797 NTLMSSP_NEGOTIATE_KEY_EXCH |
798 NTLMSSP_NEGOTIATE_SIGN;
803 /*********************************************************************
805 *********************************************************************/
808 * Next state function for the Initial packet
810 * @param ntlmssp_state NTLMSSP State
811 * @param request The request, as a DATA_BLOB. reply.data must be NULL
812 * @param request The reply, as an allocated DATA_BLOB, caller to free.
813 * @return Errors or NT_STATUS_OK.
816 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
817 DATA_BLOB reply, DATA_BLOB *next_request)
819 if (ntlmssp_state->unicode) {
820 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
822 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
825 if (ntlmssp_state->use_ntlmv2) {
826 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
829 /* generate the ntlmssp negotiate packet */
830 msrpc_gen(next_request, "CddAA",
833 ntlmssp_state->neg_flags,
834 ntlmssp_state->get_domain(),
835 ntlmssp_state->get_global_myname());
837 ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
839 return NT_STATUS_MORE_PROCESSING_REQUIRED;
843 * Next state function for the Challenge Packet. Generate an auth packet.
845 * @param ntlmssp_state NTLMSSP State
846 * @param request The request, as a DATA_BLOB. reply.data must be NULL
847 * @param request The reply, as an allocated DATA_BLOB, caller to free.
848 * @return Errors or NT_STATUS_OK.
851 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
852 const DATA_BLOB reply, DATA_BLOB *next_request)
854 uint32 chal_flags, ntlmssp_command, unkn1, unkn2;
855 DATA_BLOB server_domain_blob;
856 DATA_BLOB challenge_blob;
857 DATA_BLOB struct_blob = data_blob(NULL, 0);
859 const char *chal_parse_string;
860 const char *auth_gen_string;
861 DATA_BLOB lm_response = data_blob(NULL, 0);
862 DATA_BLOB nt_response = data_blob(NULL, 0);
863 DATA_BLOB session_key = data_blob(NULL, 0);
864 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
867 if (!msrpc_parse(&reply, "CdBd",
872 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
873 dump_data(2, (const char *)reply.data, reply.length);
875 return NT_STATUS_INVALID_PARAMETER;
878 data_blob_free(&server_domain_blob);
880 DEBUG(3, ("Got challenge flags:\n"));
881 debug_ntlmssp_flags(chal_flags);
883 ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());
885 if (ntlmssp_state->unicode) {
886 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
887 chal_parse_string = "CdUdbddB";
889 chal_parse_string = "CdUdbdd";
891 auth_gen_string = "CdBBUUUBd";
893 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
894 chal_parse_string = "CdAdbddB";
896 chal_parse_string = "CdAdbdd";
899 auth_gen_string = "CdBBAAABd";
902 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
903 debug_ntlmssp_flags(ntlmssp_state->neg_flags);
905 if (!msrpc_parse(&reply, chal_parse_string,
913 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
914 dump_data(2, (const char *)reply.data, reply.length);
915 return NT_STATUS_INVALID_PARAMETER;
918 ntlmssp_state->server_domain = talloc_strdup(ntlmssp_state->mem_ctx,
921 SAFE_FREE(server_domain);
922 if (challenge_blob.length != 8) {
923 data_blob_free(&struct_blob);
924 return NT_STATUS_INVALID_PARAMETER;
927 if (!ntlmssp_state->password) {
928 static const uchar zeros[16];
929 /* do nothing - blobs are zero length */
931 /* session key is all zeros */
932 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, zeros, 16);
934 /* not doing NLTM2 without a password */
935 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
936 } else if (ntlmssp_state->use_ntlmv2) {
938 if (!struct_blob.length) {
939 /* be lazy, match win2k - we can't do NTLMv2 without it */
940 DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
941 return NT_STATUS_INVALID_PARAMETER;
944 /* TODO: if the remote server is standalone, then we should replace 'domain'
945 with the server name as supplied above */
947 if (!SMBNTLMv2encrypt(ntlmssp_state->user,
948 ntlmssp_state->domain,
949 ntlmssp_state->password, &challenge_blob,
951 &lm_response, &nt_response, &session_key)) {
952 data_blob_free(&challenge_blob);
953 data_blob_free(&struct_blob);
954 return NT_STATUS_NO_MEMORY;
956 } else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
957 struct MD5Context md5_session_nonce_ctx;
959 uchar session_nonce[16];
960 uchar session_nonce_hash[16];
961 uchar nt_session_key[16];
962 E_md4hash(ntlmssp_state->password, nt_hash);
964 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
965 generate_random_buffer(lm_response.data, 8, False);
966 memset(lm_response.data+8, 0, 16);
968 memcpy(session_nonce, challenge_blob.data, 8);
969 memcpy(&session_nonce[8], lm_response.data, 8);
971 MD5Init(&md5_session_nonce_ctx);
972 MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
973 MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
974 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
976 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
977 DEBUG(5, ("challenge is: \n"));
978 dump_data(5, (const char *)session_nonce_hash, 8);
980 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
981 SMBNTencrypt(ntlmssp_state->password,
985 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
987 SMBsesskeygen_ntv1(nt_hash, NULL, nt_session_key);
988 hmac_md5(nt_session_key, session_nonce, sizeof(session_nonce), session_key.data);
989 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
995 E_deshash(ntlmssp_state->password, lm_hash);
996 E_md4hash(ntlmssp_state->password, nt_hash);
998 /* lanman auth is insecure, it may be disabled */
999 if (lp_client_lanman_auth()) {
1000 lm_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1001 SMBencrypt(ntlmssp_state->password,challenge_blob.data,
1005 nt_response = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 24);
1006 SMBNTencrypt(ntlmssp_state->password,challenge_blob.data,
1009 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, NULL, 16);
1010 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
1011 && lp_client_lanman_auth()) {
1012 SMBsesskeygen_lmv1(lm_hash, lm_response.data,
1014 dump_data_pw("LM session key\n", session_key.data, session_key.length);
1016 SMBsesskeygen_ntv1(nt_hash, NULL, session_key.data);
1017 dump_data_pw("NT session key:\n", session_key.data, session_key.length);
1020 data_blob_free(&struct_blob);
1022 /* Key exchange encryptes a new client-generated session key with
1023 the password-derived key */
1024 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
1025 /* Make up a new session key */
1026 uint8 client_session_key[16];
1027 generate_random_buffer(client_session_key, sizeof(client_session_key), False);
1029 /* Encrypt the new session key with the old one */
1030 encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
1031 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
1032 SamOEMhash(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
1033 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
1035 /* Mark the new session key as the 'real' session key */
1036 data_blob_free(&session_key);
1037 session_key = data_blob_talloc(ntlmssp_state->mem_ctx, client_session_key, sizeof(client_session_key));
1040 /* this generates the actual auth packet */
1041 if (!msrpc_gen(next_request, auth_gen_string,
1044 lm_response.data, lm_response.length,
1045 nt_response.data, nt_response.length,
1046 ntlmssp_state->domain,
1047 ntlmssp_state->user,
1048 ntlmssp_state->get_global_myname(),
1049 encrypted_session_key.data, encrypted_session_key.length,
1050 ntlmssp_state->neg_flags)) {
1052 return NT_STATUS_NO_MEMORY;
1055 data_blob_free(&encrypted_session_key);
1057 data_blob_free(&ntlmssp_state->chal);
1059 ntlmssp_state->chal = challenge_blob;
1060 ntlmssp_state->lm_resp = lm_response;
1061 ntlmssp_state->nt_resp = nt_response;
1062 ntlmssp_state->session_key = session_key;
1064 ntlmssp_state->expected_state = NTLMSSP_UNKNOWN;
1066 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
1067 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
1071 return NT_STATUS_MORE_PROCESSING_REQUIRED;
1074 NTSTATUS ntlmssp_client_start(NTLMSSP_STATE **ntlmssp_state)
1076 TALLOC_CTX *mem_ctx;
1078 mem_ctx = talloc_init("NTLMSSP Client context");
1080 *ntlmssp_state = talloc_zero(mem_ctx, sizeof(**ntlmssp_state));
1081 if (!*ntlmssp_state) {
1082 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1083 talloc_destroy(mem_ctx);
1084 return NT_STATUS_NO_MEMORY;
1087 (*ntlmssp_state)->role = NTLMSSP_CLIENT;
1089 (*ntlmssp_state)->mem_ctx = mem_ctx;
1091 (*ntlmssp_state)->get_global_myname = global_myname;
1092 (*ntlmssp_state)->get_domain = lp_workgroup;
1094 (*ntlmssp_state)->unicode = True;
1096 (*ntlmssp_state)->use_ntlmv2 = lp_client_ntlmv2_auth();
1098 (*ntlmssp_state)->expected_state = NTLMSSP_INITIAL;
1100 (*ntlmssp_state)->ref_count = 1;
1102 (*ntlmssp_state)->neg_flags =
1103 NTLMSSP_NEGOTIATE_128 |
1104 NTLMSSP_NEGOTIATE_NTLM |
1105 NTLMSSP_NEGOTIATE_NTLM2 |
1106 NTLMSSP_NEGOTIATE_KEY_EXCH |
1108 * We need to set this to allow a later SetPassword
1109 * via the SAMR pipe to succeed. Strange.... We could
1110 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
1112 NTLMSSP_NEGOTIATE_SIGN |
1113 NTLMSSP_REQUEST_TARGET;
1115 return NT_STATUS_OK;