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
;