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 ntlmssp_state
->domain
= talloc_strdup(ntlmssp_state
->mem_ctx
, domain
);
172 if (!ntlmssp_state
->domain
) {
173 return NT_STATUS_NO_MEMORY
;
179 * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
182 NTSTATUS
ntlmssp_set_workstation(NTLMSSP_STATE
*ntlmssp_state
, const char *workstation
)
184 ntlmssp_state
->workstation
= talloc_strdup(ntlmssp_state
->mem_ctx
, workstation
);
185 if (!ntlmssp_state
->domain
) {
186 return NT_STATUS_NO_MEMORY
;
192 * Store a DATA_BLOB containing an NTLMSSP response, for use later.
193 * This copies the data blob
196 NTSTATUS
ntlmssp_store_response(NTLMSSP_STATE
*ntlmssp_state
,
199 ntlmssp_state
->stored_response
= data_blob_talloc(ntlmssp_state
->mem_ctx
,
200 response
.data
, response
.length
);
205 * Next state function for the NTLMSSP state machine
207 * @param ntlmssp_state NTLMSSP State
208 * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
209 * @param out The reply, as an allocated DATA_BLOB, caller to free.
210 * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
213 NTSTATUS
ntlmssp_update(NTLMSSP_STATE
*ntlmssp_state
,
214 const DATA_BLOB in
, DATA_BLOB
*out
)
217 uint32 ntlmssp_command
;
220 *out
= data_blob(NULL
, 0);
222 if (!in
.length
&& ntlmssp_state
->stored_response
.length
) {
223 input
= ntlmssp_state
->stored_response
;
225 /* we only want to read the stored response once - overwrite it */
226 ntlmssp_state
->stored_response
= data_blob(NULL
, 0);
232 switch (ntlmssp_state
->role
) {
234 ntlmssp_command
= NTLMSSP_INITIAL
;
237 /* 'datagram' mode - no neg packet */
238 ntlmssp_command
= NTLMSSP_NEGOTIATE
;
242 if (!msrpc_parse(&input
, "Cd",
245 DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
246 dump_data(2, (const char *)input
.data
, input
.length
);
247 return NT_STATUS_INVALID_PARAMETER
;
251 if (ntlmssp_command
!= ntlmssp_state
->expected_state
) {
252 DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command
, ntlmssp_state
->expected_state
));
253 return NT_STATUS_INVALID_PARAMETER
;
256 for (i
=0; ntlmssp_callbacks
[i
].fn
; i
++) {
257 if (ntlmssp_callbacks
[i
].role
== ntlmssp_state
->role
258 && ntlmssp_callbacks
[i
].ntlmssp_command
== ntlmssp_command
) {
259 return ntlmssp_callbacks
[i
].fn(ntlmssp_state
, input
, out
);
263 DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
264 ntlmssp_state
->role
, ntlmssp_command
));
266 return NT_STATUS_INVALID_PARAMETER
;
270 * End an NTLMSSP state machine
272 * @param ntlmssp_state NTLMSSP State, free()ed by this function
275 void ntlmssp_end(NTLMSSP_STATE
**ntlmssp_state
)
277 TALLOC_CTX
*mem_ctx
= (*ntlmssp_state
)->mem_ctx
;
279 (*ntlmssp_state
)->ref_count
--;
281 if ((*ntlmssp_state
)->ref_count
== 0) {
282 data_blob_free(&(*ntlmssp_state
)->chal
);
283 data_blob_free(&(*ntlmssp_state
)->lm_resp
);
284 data_blob_free(&(*ntlmssp_state
)->nt_resp
);
286 talloc_destroy(mem_ctx
);
289 *ntlmssp_state
= NULL
;
294 * Determine correct target name flags for reply, given server role
295 * and negotiated flags
297 * @param ntlmssp_state NTLMSSP State
298 * @param neg_flags The flags from the packet
299 * @param chal_flags The flags to be set in the reply packet
300 * @return The 'target name' string.
303 static const char *ntlmssp_target_name(struct ntlmssp_state
*ntlmssp_state
,
304 uint32 neg_flags
, uint32
*chal_flags
)
306 if (neg_flags
& NTLMSSP_REQUEST_TARGET
) {
307 *chal_flags
|= NTLMSSP_CHAL_TARGET_INFO
;
308 *chal_flags
|= NTLMSSP_REQUEST_TARGET
;
309 if (ntlmssp_state
->server_role
== ROLE_STANDALONE
) {
310 *chal_flags
|= NTLMSSP_TARGET_TYPE_SERVER
;
311 return ntlmssp_state
->get_global_myname();
313 *chal_flags
|= NTLMSSP_TARGET_TYPE_DOMAIN
;
314 return ntlmssp_state
->get_domain();
321 static void ntlmssp_handle_neg_flags(struct ntlmssp_state
*ntlmssp_state
,
322 uint32 neg_flags
, BOOL allow_lm
) {
323 if (neg_flags
& NTLMSSP_NEGOTIATE_UNICODE
) {
324 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_UNICODE
;
325 ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_OEM
;
326 ntlmssp_state
->unicode
= True
;
328 ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_UNICODE
;
329 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_OEM
;
330 ntlmssp_state
->unicode
= False
;
333 if ((neg_flags
& NTLMSSP_NEGOTIATE_LM_KEY
) && allow_lm
) {
334 /* other end forcing us to use LM */
335 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_LM_KEY
;
336 ntlmssp_state
->use_ntlmv2
= False
;
338 ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_LM_KEY
;
341 if (neg_flags
& NTLMSSP_NEGOTIATE_ALWAYS_SIGN
) {
342 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_ALWAYS_SIGN
;
345 if (!(neg_flags
& NTLMSSP_NEGOTIATE_NTLM2
)) {
346 ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_NTLM2
;
349 if (!(neg_flags
& NTLMSSP_NEGOTIATE_128
)) {
350 ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_128
;
353 if (!(neg_flags
& NTLMSSP_NEGOTIATE_KEY_EXCH
)) {
354 ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_KEY_EXCH
;
357 if ((neg_flags
& NTLMSSP_REQUEST_TARGET
)) {
358 ntlmssp_state
->neg_flags
|= NTLMSSP_REQUEST_TARGET
;
365 * Next state function for the Negotiate packet
367 * @param ntlmssp_state NTLMSSP State
368 * @param request The request, as a DATA_BLOB
369 * @param request The reply, as an allocated DATA_BLOB, caller to free.
370 * @return Errors or MORE_PROCESSING_REQUIRED if a reply is sent.
373 static NTSTATUS
ntlmssp_server_negotiate(struct ntlmssp_state
*ntlmssp_state
,
374 const DATA_BLOB request
, DATA_BLOB
*reply
)
376 DATA_BLOB struct_blob
;
377 fstring dnsname
, dnsdomname
;
378 uint32 neg_flags
= 0;
379 uint32 ntlmssp_command
, chal_flags
;
380 char *cliname
=NULL
, *domname
=NULL
;
381 const uint8
*cryptkey
;
382 const char *target_name
;
384 /* parse the NTLMSSP packet */
386 file_save("ntlmssp_negotiate.dat", request
.data
, request
.length
);
389 if (request
.length
) {
390 if (!msrpc_parse(&request
, "CddAA",
396 DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP:\n"));
397 dump_data(2, (const char *)request
.data
, request
.length
);
398 return NT_STATUS_INVALID_PARAMETER
;
404 debug_ntlmssp_flags(neg_flags
);
407 ntlmssp_handle_neg_flags(ntlmssp_state
, neg_flags
, lp_lanman_auth());
409 /* Ask our caller what challenge they would like in the packet */
410 cryptkey
= ntlmssp_state
->get_challenge(ntlmssp_state
);
412 /* Check if we may set the challenge */
413 if (!ntlmssp_state
->may_set_challenge(ntlmssp_state
)) {
414 ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_NTLM2
;
417 /* The flags we send back are not just the negotiated flags,
418 * they are also 'what is in this packet'. Therfore, we
419 * operate on 'chal_flags' from here on
422 chal_flags
= ntlmssp_state
->neg_flags
;
424 /* get the right name to fill in as 'target' */
425 target_name
= ntlmssp_target_name(ntlmssp_state
,
426 neg_flags
, &chal_flags
);
427 if (target_name
== NULL
)
428 return NT_STATUS_INVALID_PARAMETER
;
430 ntlmssp_state
->chal
= data_blob_talloc(ntlmssp_state
->mem_ctx
, cryptkey
, 8);
431 ntlmssp_state
->internal_chal
= data_blob_talloc(ntlmssp_state
->mem_ctx
, cryptkey
, 8);
434 /* This should be a 'netbios domain -> DNS domain' mapping */
435 dnsdomname
[0] = '\0';
436 get_mydnsdomname(dnsdomname
);
437 strlower_m(dnsdomname
);
440 get_mydnsfullname(dnsname
);
442 /* This creates the 'blob' of names that appears at the end of the packet */
443 if (chal_flags
& NTLMSSP_CHAL_TARGET_INFO
)
445 const char *target_name_dns
= "";
446 if (chal_flags
|= NTLMSSP_TARGET_TYPE_DOMAIN
) {
447 target_name_dns
= dnsdomname
;
448 } else if (chal_flags
|= NTLMSSP_TARGET_TYPE_SERVER
) {
449 target_name_dns
= dnsname
;
452 msrpc_gen(&struct_blob
, "aaaaa",
453 NTLMSSP_NAME_TYPE_DOMAIN
, target_name
,
454 NTLMSSP_NAME_TYPE_SERVER
, ntlmssp_state
->get_global_myname(),
455 NTLMSSP_NAME_TYPE_DOMAIN_DNS
, dnsdomname
,
456 NTLMSSP_NAME_TYPE_SERVER_DNS
, dnsname
,
459 struct_blob
= data_blob(NULL
, 0);
463 /* Marshel the packet in the right format, be it unicode or ASCII */
464 const char *gen_string
;
465 if (ntlmssp_state
->unicode
) {
466 gen_string
= "CdUdbddB";
468 gen_string
= "CdAdbddB";
471 msrpc_gen(reply
, gen_string
,
478 struct_blob
.data
, struct_blob
.length
);
481 data_blob_free(&struct_blob
);
483 ntlmssp_state
->expected_state
= NTLMSSP_AUTH
;
485 return NT_STATUS_MORE_PROCESSING_REQUIRED
;
489 * Next state function for the Authenticate packet
491 * @param ntlmssp_state NTLMSSP State
492 * @param request The request, as a DATA_BLOB
493 * @param request The reply, as an allocated DATA_BLOB, caller to free.
494 * @return Errors or NT_STATUS_OK.
497 static NTSTATUS
ntlmssp_server_auth(struct ntlmssp_state
*ntlmssp_state
,
498 const DATA_BLOB request
, DATA_BLOB
*reply
)
500 DATA_BLOB encrypted_session_key
= data_blob(NULL
, 0);
501 DATA_BLOB user_session_key
= data_blob(NULL
, 0);
502 DATA_BLOB lm_session_key
= data_blob(NULL
, 0);
503 DATA_BLOB session_key
= data_blob(NULL
, 0);
504 uint32 ntlmssp_command
, auth_flags
;
508 BOOL doing_ntlm2
= False
;
510 uchar session_nonce
[16];
511 uchar session_nonce_hash
[16];
513 const char *parse_string
;
516 char *workstation
= NULL
;
518 /* parse the NTLMSSP packet */
519 *reply
= data_blob(NULL
, 0);
522 file_save("ntlmssp_auth.dat", request
.data
, request
.length
);
525 if (ntlmssp_state
->unicode
) {
526 parse_string
= "CdBBUUUBd";
528 parse_string
= "CdBBAAABd";
531 data_blob_free(&ntlmssp_state
->lm_resp
);
532 data_blob_free(&ntlmssp_state
->nt_resp
);
534 ntlmssp_state
->user
= NULL
;
535 ntlmssp_state
->domain
= NULL
;
536 ntlmssp_state
->workstation
= NULL
;
538 /* now the NTLMSSP encoded auth hashes */
539 if (!msrpc_parse(&request
, parse_string
,
542 &ntlmssp_state
->lm_resp
,
543 &ntlmssp_state
->nt_resp
,
547 &encrypted_session_key
,
549 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
550 dump_data(2, (const char *)request
.data
, request
.length
);
553 SAFE_FREE(workstation
);
554 data_blob_free(&encrypted_session_key
);
557 /* Try again with a shorter string (Win9X truncates this packet) */
558 if (ntlmssp_state
->unicode
) {
559 parse_string
= "CdBBUUU";
561 parse_string
= "CdBBAAA";
564 /* now the NTLMSSP encoded auth hashes */
565 if (!msrpc_parse(&request
, parse_string
,
568 &ntlmssp_state
->lm_resp
,
569 &ntlmssp_state
->nt_resp
,
573 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
574 dump_data(2, (const char *)request
.data
, request
.length
);
577 SAFE_FREE(workstation
);
579 return NT_STATUS_INVALID_PARAMETER
;
584 ntlmssp_handle_neg_flags(ntlmssp_state
, auth_flags
, lp_lanman_auth());
586 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_set_domain(ntlmssp_state
, domain
))) {
589 SAFE_FREE(workstation
);
590 data_blob_free(&encrypted_session_key
);
594 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_set_username(ntlmssp_state
, user
))) {
597 SAFE_FREE(workstation
);
598 data_blob_free(&encrypted_session_key
);
602 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_set_workstation(ntlmssp_state
, workstation
))) {
605 SAFE_FREE(workstation
);
606 data_blob_free(&encrypted_session_key
);
612 SAFE_FREE(workstation
);
614 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
615 ntlmssp_state
->user
, ntlmssp_state
->domain
, ntlmssp_state
->workstation
, (unsigned long)ntlmssp_state
->lm_resp
.length
, (unsigned long)ntlmssp_state
->nt_resp
.length
));
618 file_save("nthash1.dat", &ntlmssp_state
->nt_resp
.data
, &ntlmssp_state
->nt_resp
.length
);
619 file_save("lmhash1.dat", &ntlmssp_state
->lm_resp
.data
, &ntlmssp_state
->lm_resp
.length
);
622 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
625 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
627 if (ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_NTLM2
) {
628 if (ntlmssp_state
->nt_resp
.length
== 24 && ntlmssp_state
->lm_resp
.length
== 24) {
629 struct MD5Context md5_session_nonce_ctx
;
630 SMB_ASSERT(ntlmssp_state
->internal_chal
.data
&& ntlmssp_state
->internal_chal
.length
== 8);
634 memcpy(session_nonce
, ntlmssp_state
->internal_chal
.data
, 8);
635 memcpy(&session_nonce
[8], ntlmssp_state
->lm_resp
.data
, 8);
637 MD5Init(&md5_session_nonce_ctx
);
638 MD5Update(&md5_session_nonce_ctx
, session_nonce
, 16);
639 MD5Final(session_nonce_hash
, &md5_session_nonce_ctx
);
641 ntlmssp_state
->chal
= data_blob_talloc(ntlmssp_state
->mem_ctx
, session_nonce_hash
, 8);
643 /* LM response is no longer useful */
644 data_blob_free(&ntlmssp_state
->lm_resp
);
646 /* We changed the effective challenge - set it */
647 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_state
->set_challenge(ntlmssp_state
, &ntlmssp_state
->chal
))) {
648 data_blob_free(&encrypted_session_key
);
655 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
656 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
657 * smb.conf file) and no NTLMv2 response was sent then the password check
658 * will fail here. JRA.
661 /* Finally, actually ask if the password is OK */
663 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_state
->check_password(ntlmssp_state
,
664 &user_session_key
, &lm_session_key
))) {
665 data_blob_free(&encrypted_session_key
);
669 dump_data_pw("NT session key:\n", user_session_key
.data
, user_session_key
.length
);
670 dump_data_pw("LM first-8:\n", lm_session_key
.data
, lm_session_key
.length
);
672 /* Handle the different session key derivation for NTLM2 */
674 if (user_session_key
.data
&& user_session_key
.length
== 16) {
675 session_key
= data_blob_talloc(ntlmssp_state
->mem_ctx
, NULL
, 16);
676 hmac_md5(user_session_key
.data
, session_nonce
,
677 sizeof(session_nonce
), session_key
.data
);
678 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
679 dump_data_pw("NTLM2 session key:\n", session_key
.data
, session_key
.length
);
682 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
683 session_key
= data_blob(NULL
, 0);
685 } else if (ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_LM_KEY
) {
686 if (lm_session_key
.data
&& lm_session_key
.length
>= 8) {
687 if (ntlmssp_state
->lm_resp
.data
&& ntlmssp_state
->lm_resp
.length
== 24) {
688 session_key
= data_blob_talloc(ntlmssp_state
->mem_ctx
, NULL
, 16);
689 SMBsesskeygen_lm_sess_key(lm_session_key
.data
, ntlmssp_state
->lm_resp
.data
,
691 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
692 dump_data_pw("LM session key:\n", session_key
.data
, session_key
.length
);
694 /* use the key unmodified - it's
695 * probably a NULL key from the guest
697 session_key
= lm_session_key
;
700 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
701 session_key
= data_blob(NULL
, 0);
703 } else if (user_session_key
.data
) {
704 session_key
= user_session_key
;
705 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
706 dump_data_pw("unmodified session key:\n", session_key
.data
, session_key
.length
);
707 } else if (lm_session_key
.data
) {
708 session_key
= lm_session_key
;
709 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
710 dump_data_pw("unmodified session key:\n", session_key
.data
, session_key
.length
);
712 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
713 session_key
= data_blob(NULL
, 0);
716 /* With KEY_EXCH, the client supplies the proposed session key,
717 but encrypts it with the long-term key */
718 if (ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_KEY_EXCH
) {
719 if (!encrypted_session_key
.data
|| encrypted_session_key
.length
!= 16) {
720 data_blob_free(&encrypted_session_key
);
721 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
722 encrypted_session_key
.length
));
723 return NT_STATUS_INVALID_PARAMETER
;
724 } else if (!session_key
.data
|| session_key
.length
!= 16) {
725 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
726 session_key
.length
));
727 ntlmssp_state
->session_key
= session_key
;
729 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key
.data
, encrypted_session_key
.length
);
730 SamOEMhash(encrypted_session_key
.data
,
732 encrypted_session_key
.length
);
733 ntlmssp_state
->session_key
= data_blob_talloc(ntlmssp_state
->mem_ctx
,
734 encrypted_session_key
.data
,
735 encrypted_session_key
.length
);
736 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key
.data
,
737 encrypted_session_key
.length
);
740 ntlmssp_state
->session_key
= session_key
;
743 if (!NT_STATUS_IS_OK(nt_status
)) {
744 ntlmssp_state
->session_key
= data_blob(NULL
, 0);
745 } else if (ntlmssp_state
->session_key
.length
) {
746 nt_status
= ntlmssp_sign_init(ntlmssp_state
);
749 data_blob_free(&encrypted_session_key
);
751 /* allow arbitarily many authentications */
752 ntlmssp_state
->expected_state
= NTLMSSP_AUTH
;
758 * Create an NTLMSSP state machine
760 * @param ntlmssp_state NTLMSSP State, allocated by this function
763 NTSTATUS
ntlmssp_server_start(NTLMSSP_STATE
**ntlmssp_state
)
767 mem_ctx
= talloc_init("NTLMSSP context");
769 *ntlmssp_state
= talloc_zero(mem_ctx
, sizeof(**ntlmssp_state
));
770 if (!*ntlmssp_state
) {
771 DEBUG(0,("ntlmssp_server_start: talloc failed!\n"));
772 talloc_destroy(mem_ctx
);
773 return NT_STATUS_NO_MEMORY
;
776 (*ntlmssp_state
)->role
= NTLMSSP_SERVER
;
778 (*ntlmssp_state
)->mem_ctx
= mem_ctx
;
779 (*ntlmssp_state
)->get_challenge
= get_challenge
;
780 (*ntlmssp_state
)->set_challenge
= set_challenge
;
781 (*ntlmssp_state
)->may_set_challenge
= may_set_challenge
;
783 (*ntlmssp_state
)->get_global_myname
= global_myname
;
784 (*ntlmssp_state
)->get_domain
= lp_workgroup
;
785 (*ntlmssp_state
)->server_role
= ROLE_DOMAIN_MEMBER
; /* a good default */
787 (*ntlmssp_state
)->expected_state
= NTLMSSP_NEGOTIATE
;
789 (*ntlmssp_state
)->ref_count
= 1;
791 (*ntlmssp_state
)->neg_flags
=
792 NTLMSSP_NEGOTIATE_128
|
793 NTLMSSP_NEGOTIATE_NTLM
|
794 NTLMSSP_NEGOTIATE_NTLM2
|
795 NTLMSSP_NEGOTIATE_KEY_EXCH
|
796 NTLMSSP_NEGOTIATE_SIGN
;
801 /*********************************************************************
803 *********************************************************************/
806 * Next state function for the Initial packet
808 * @param ntlmssp_state NTLMSSP State
809 * @param request The request, as a DATA_BLOB. reply.data must be NULL
810 * @param request The reply, as an allocated DATA_BLOB, caller to free.
811 * @return Errors or NT_STATUS_OK.
814 static NTSTATUS
ntlmssp_client_initial(struct ntlmssp_state
*ntlmssp_state
,
815 DATA_BLOB reply
, DATA_BLOB
*next_request
)
817 if (ntlmssp_state
->unicode
) {
818 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_UNICODE
;
820 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_OEM
;
823 if (ntlmssp_state
->use_ntlmv2
) {
824 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_NTLM2
;
827 /* generate the ntlmssp negotiate packet */
828 msrpc_gen(next_request
, "CddAA",
831 ntlmssp_state
->neg_flags
,
832 ntlmssp_state
->get_domain(),
833 ntlmssp_state
->get_global_myname());
835 ntlmssp_state
->expected_state
= NTLMSSP_CHALLENGE
;
837 return NT_STATUS_MORE_PROCESSING_REQUIRED
;
841 * Next state function for the Challenge Packet. Generate an auth packet.
843 * @param ntlmssp_state NTLMSSP State
844 * @param request The request, as a DATA_BLOB. reply.data must be NULL
845 * @param request The reply, as an allocated DATA_BLOB, caller to free.
846 * @return Errors or NT_STATUS_OK.
849 static NTSTATUS
ntlmssp_client_challenge(struct ntlmssp_state
*ntlmssp_state
,
850 const DATA_BLOB reply
, DATA_BLOB
*next_request
)
852 uint32 chal_flags
, ntlmssp_command
, unkn1
, unkn2
;
853 DATA_BLOB server_domain_blob
;
854 DATA_BLOB challenge_blob
;
855 DATA_BLOB struct_blob
= data_blob(NULL
, 0);
857 const char *chal_parse_string
;
858 const char *auth_gen_string
;
859 DATA_BLOB lm_response
= data_blob(NULL
, 0);
860 DATA_BLOB nt_response
= data_blob(NULL
, 0);
861 DATA_BLOB session_key
= data_blob(NULL
, 0);
862 DATA_BLOB encrypted_session_key
= data_blob(NULL
, 0);
865 if (!msrpc_parse(&reply
, "CdBd",
870 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
871 dump_data(2, (const char *)reply
.data
, reply
.length
);
873 return NT_STATUS_INVALID_PARAMETER
;
876 data_blob_free(&server_domain_blob
);
878 DEBUG(3, ("Got challenge flags:\n"));
879 debug_ntlmssp_flags(chal_flags
);
881 ntlmssp_handle_neg_flags(ntlmssp_state
, chal_flags
, lp_client_lanman_auth());
883 if (ntlmssp_state
->unicode
) {
884 if (chal_flags
& NTLMSSP_CHAL_TARGET_INFO
) {
885 chal_parse_string
= "CdUdbddB";
887 chal_parse_string
= "CdUdbdd";
889 auth_gen_string
= "CdBBUUUBd";
891 if (chal_flags
& NTLMSSP_CHAL_TARGET_INFO
) {
892 chal_parse_string
= "CdAdbddB";
894 chal_parse_string
= "CdAdbdd";
897 auth_gen_string
= "CdBBAAABd";
900 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
901 debug_ntlmssp_flags(ntlmssp_state
->neg_flags
);
903 if (!msrpc_parse(&reply
, chal_parse_string
,
911 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
912 dump_data(2, (const char *)reply
.data
, reply
.length
);
913 return NT_STATUS_INVALID_PARAMETER
;
916 ntlmssp_state
->server_domain
= talloc_strdup(ntlmssp_state
->mem_ctx
,
919 SAFE_FREE(server_domain
);
920 if (challenge_blob
.length
!= 8) {
921 data_blob_free(&struct_blob
);
922 return NT_STATUS_INVALID_PARAMETER
;
925 if (!ntlmssp_state
->password
) {
926 static const uchar zeros
[16];
927 /* do nothing - blobs are zero length */
929 /* session key is all zeros */
930 session_key
= data_blob_talloc(ntlmssp_state
->mem_ctx
, zeros
, 16);
932 /* not doing NLTM2 without a password */
933 ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_NTLM2
;
934 } else if (ntlmssp_state
->use_ntlmv2
) {
936 if (!struct_blob
.length
) {
937 /* be lazy, match win2k - we can't do NTLMv2 without it */
938 DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
939 return NT_STATUS_INVALID_PARAMETER
;
942 /* TODO: if the remote server is standalone, then we should replace 'domain'
943 with the server name as supplied above */
945 if (!SMBNTLMv2encrypt(ntlmssp_state
->user
,
946 ntlmssp_state
->domain
,
947 ntlmssp_state
->password
, &challenge_blob
,
949 &lm_response
, &nt_response
, &session_key
)) {
950 data_blob_free(&challenge_blob
);
951 data_blob_free(&struct_blob
);
952 return NT_STATUS_NO_MEMORY
;
954 } else if (ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_NTLM2
) {
955 struct MD5Context md5_session_nonce_ctx
;
957 uchar session_nonce
[16];
958 uchar session_nonce_hash
[16];
959 uchar user_session_key
[16];
960 E_md4hash(ntlmssp_state
->password
, nt_hash
);
962 lm_response
= data_blob_talloc(ntlmssp_state
->mem_ctx
, NULL
, 24);
963 generate_random_buffer(lm_response
.data
, 8, False
);
964 memset(lm_response
.data
+8, 0, 16);
966 memcpy(session_nonce
, challenge_blob
.data
, 8);
967 memcpy(&session_nonce
[8], lm_response
.data
, 8);
969 MD5Init(&md5_session_nonce_ctx
);
970 MD5Update(&md5_session_nonce_ctx
, challenge_blob
.data
, 8);
971 MD5Update(&md5_session_nonce_ctx
, lm_response
.data
, 8);
972 MD5Final(session_nonce_hash
, &md5_session_nonce_ctx
);
974 DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
975 DEBUG(5, ("challenge is: \n"));
976 dump_data(5, (const char *)session_nonce_hash
, 8);
978 nt_response
= data_blob_talloc(ntlmssp_state
->mem_ctx
, NULL
, 24);
979 SMBNTencrypt(ntlmssp_state
->password
,
983 session_key
= data_blob_talloc(ntlmssp_state
->mem_ctx
, NULL
, 16);
985 SMBsesskeygen_ntv1(nt_hash
, NULL
, user_session_key
);
986 hmac_md5(user_session_key
, session_nonce
, sizeof(session_nonce
), session_key
.data
);
987 dump_data_pw("NTLM2 session key:\n", session_key
.data
, session_key
.length
);
993 E_deshash(ntlmssp_state
->password
, lm_hash
);
994 E_md4hash(ntlmssp_state
->password
, nt_hash
);
996 /* lanman auth is insecure, it may be disabled */
997 if (lp_client_lanman_auth()) {
998 lm_response
= data_blob_talloc(ntlmssp_state
->mem_ctx
, NULL
, 24);
999 SMBencrypt(ntlmssp_state
->password
,challenge_blob
.data
,
1003 nt_response
= data_blob_talloc(ntlmssp_state
->mem_ctx
, NULL
, 24);
1004 SMBNTencrypt(ntlmssp_state
->password
,challenge_blob
.data
,
1007 session_key
= data_blob_talloc(ntlmssp_state
->mem_ctx
, NULL
, 16);
1008 if ((ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_LM_KEY
)
1009 && lp_client_lanman_auth()) {
1010 SMBsesskeygen_lmv1(lm_hash
, lm_response
.data
,
1012 dump_data_pw("LM session key\n", session_key
.data
, session_key
.length
);
1014 SMBsesskeygen_ntv1(nt_hash
, NULL
, session_key
.data
);
1015 dump_data_pw("NT session key:\n", session_key
.data
, session_key
.length
);
1018 data_blob_free(&struct_blob
);
1020 /* Key exchange encryptes a new client-generated session key with
1021 the password-derived key */
1022 if (ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_KEY_EXCH
) {
1023 /* Make up a new session key */
1024 uint8 client_session_key
[16];
1025 generate_random_buffer(client_session_key
, sizeof(client_session_key
), False
);
1027 /* Encrypt the new session key with the old one */
1028 encrypted_session_key
= data_blob(client_session_key
, sizeof(client_session_key
));
1029 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key
.data
, encrypted_session_key
.length
);
1030 SamOEMhash(encrypted_session_key
.data
, session_key
.data
, encrypted_session_key
.length
);
1031 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key
.data
, encrypted_session_key
.length
);
1033 /* Mark the new session key as the 'real' session key */
1034 data_blob_free(&session_key
);
1035 session_key
= data_blob_talloc(ntlmssp_state
->mem_ctx
, client_session_key
, sizeof(client_session_key
));
1038 /* this generates the actual auth packet */
1039 if (!msrpc_gen(next_request
, auth_gen_string
,
1042 lm_response
.data
, lm_response
.length
,
1043 nt_response
.data
, nt_response
.length
,
1044 ntlmssp_state
->domain
,
1045 ntlmssp_state
->user
,
1046 ntlmssp_state
->get_global_myname(),
1047 encrypted_session_key
.data
, encrypted_session_key
.length
,
1048 ntlmssp_state
->neg_flags
)) {
1050 return NT_STATUS_NO_MEMORY
;
1053 data_blob_free(&encrypted_session_key
);
1055 data_blob_free(&ntlmssp_state
->chal
);
1057 ntlmssp_state
->chal
= challenge_blob
;
1058 ntlmssp_state
->lm_resp
= lm_response
;
1059 ntlmssp_state
->nt_resp
= nt_response
;
1060 ntlmssp_state
->session_key
= session_key
;
1062 ntlmssp_state
->expected_state
= NTLMSSP_UNKNOWN
;
1064 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_sign_init(ntlmssp_state
))) {
1065 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status
)));
1069 return NT_STATUS_MORE_PROCESSING_REQUIRED
;
1072 NTSTATUS
ntlmssp_client_start(NTLMSSP_STATE
**ntlmssp_state
)
1074 TALLOC_CTX
*mem_ctx
;
1076 mem_ctx
= talloc_init("NTLMSSP Client context");
1078 *ntlmssp_state
= talloc_zero(mem_ctx
, sizeof(**ntlmssp_state
));
1079 if (!*ntlmssp_state
) {
1080 DEBUG(0,("ntlmssp_client_start: talloc failed!\n"));
1081 talloc_destroy(mem_ctx
);
1082 return NT_STATUS_NO_MEMORY
;
1085 (*ntlmssp_state
)->role
= NTLMSSP_CLIENT
;
1087 (*ntlmssp_state
)->mem_ctx
= mem_ctx
;
1089 (*ntlmssp_state
)->get_global_myname
= global_myname
;
1090 (*ntlmssp_state
)->get_domain
= lp_workgroup
;
1092 (*ntlmssp_state
)->unicode
= True
;
1094 (*ntlmssp_state
)->use_ntlmv2
= lp_client_ntlmv2_auth();
1096 (*ntlmssp_state
)->expected_state
= NTLMSSP_INITIAL
;
1098 (*ntlmssp_state
)->ref_count
= 1;
1100 (*ntlmssp_state
)->neg_flags
=
1101 NTLMSSP_NEGOTIATE_128
|
1102 NTLMSSP_NEGOTIATE_NTLM
|
1103 NTLMSSP_NEGOTIATE_NTLM2
|
1104 NTLMSSP_NEGOTIATE_KEY_EXCH
|
1106 * We need to set this to allow a later SetPassword
1107 * via the SAMR pipe to succeed. Strange.... We could
1108 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
1110 NTLMSSP_NEGOTIATE_SIGN
|
1111 NTLMSSP_REQUEST_TARGET
;
1113 return NT_STATUS_OK
;