2 Unix SMB/Netbios implementation.
4 handle NLTMSSP, client server side parsing
6 Copyright (C) Andrew Tridgell 2001
7 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
8 Copyright (C) Stefan Metzmacher 2005
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "system/network.h"
26 #include "auth/ntlmssp/ntlmssp.h"
27 #include "../librpc/gen_ndr/ntlmssp.h"
28 #include "../libcli/auth/libcli_auth.h"
29 #include "../lib/crypto/crypto.h"
30 #include "auth/gensec/gensec.h"
31 #include "auth/auth.h"
32 #include "auth/ntlm/auth_proto.h"
33 #include "param/param.h"
34 #include "auth/session_proto.h"
37 * Set a username on an NTLMSSP context - ensures it is talloc()ed
41 static NTSTATUS
ntlmssp_set_username(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
, const char *user
)
44 /* it should be at least "" */
45 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
46 return NT_STATUS_INVALID_PARAMETER
;
48 gensec_ntlmssp_state
->user
= talloc_strdup(gensec_ntlmssp_state
, user
);
49 if (!gensec_ntlmssp_state
->user
) {
50 return NT_STATUS_NO_MEMORY
;
56 * Set a domain on an NTLMSSP context - ensures it is talloc()ed
59 static NTSTATUS
ntlmssp_set_domain(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
, const char *domain
)
61 gensec_ntlmssp_state
->domain
= talloc_strdup(gensec_ntlmssp_state
, domain
);
62 if (!gensec_ntlmssp_state
->domain
) {
63 return NT_STATUS_NO_MEMORY
;
69 * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
72 static NTSTATUS
ntlmssp_set_workstation(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
, const char *workstation
)
74 gensec_ntlmssp_state
->workstation
= talloc_strdup(gensec_ntlmssp_state
, workstation
);
75 if (!gensec_ntlmssp_state
->workstation
) {
76 return NT_STATUS_NO_MEMORY
;
82 * Determine correct target name flags for reply, given server role
83 * and negotiated flags
85 * @param gensec_ntlmssp_state NTLMSSP State
86 * @param neg_flags The flags from the packet
87 * @param chal_flags The flags to be set in the reply packet
88 * @return The 'target name' string.
91 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
,
92 uint32_t neg_flags
, uint32_t *chal_flags
)
94 if (neg_flags
& NTLMSSP_REQUEST_TARGET
) {
95 *chal_flags
|= NTLMSSP_NEGOTIATE_TARGET_INFO
;
96 *chal_flags
|= NTLMSSP_REQUEST_TARGET
;
97 if (gensec_ntlmssp_state
->server_role
== ROLE_STANDALONE
) {
98 *chal_flags
|= NTLMSSP_TARGET_TYPE_SERVER
;
99 return gensec_ntlmssp_state
->server_name
;
101 *chal_flags
|= NTLMSSP_TARGET_TYPE_DOMAIN
;
102 return gensec_ntlmssp_state
->domain
;
112 * Next state function for the Negotiate packet
114 * @param gensec_security GENSEC state
115 * @param out_mem_ctx Memory context for *out
116 * @param in The request, as a DATA_BLOB. reply.data must be NULL
117 * @param out The reply, as an allocated DATA_BLOB, caller to free.
118 * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
121 NTSTATUS
ntlmssp_server_negotiate(struct gensec_security
*gensec_security
,
122 TALLOC_CTX
*out_mem_ctx
,
123 const DATA_BLOB in
, DATA_BLOB
*out
)
125 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
126 DATA_BLOB struct_blob
;
127 uint32_t neg_flags
= 0;
128 uint32_t ntlmssp_command
, chal_flags
;
129 const uint8_t *cryptkey
;
130 const char *target_name
;
132 /* parse the NTLMSSP packet */
134 file_save("ntlmssp_negotiate.dat", request
.data
, request
.length
);
138 if ((in
.length
< 16) || !msrpc_parse(out_mem_ctx
,
143 DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
144 "NTLMSSP Negotiate of length %u:\n",
145 (unsigned int)in
.length
));
146 dump_data(2, in
.data
, in
.length
);
147 return NT_STATUS_INVALID_PARAMETER
;
149 debug_ntlmssp_flags(neg_flags
);
152 ntlmssp_handle_neg_flags(gensec_ntlmssp_state
, neg_flags
, gensec_ntlmssp_state
->allow_lm_key
);
154 /* Ask our caller what challenge they would like in the packet */
155 cryptkey
= gensec_ntlmssp_state
->get_challenge(gensec_ntlmssp_state
);
157 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
158 return NT_STATUS_INTERNAL_ERROR
;
161 /* Check if we may set the challenge */
162 if (!gensec_ntlmssp_state
->may_set_challenge(gensec_ntlmssp_state
)) {
163 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_NTLM2
;
166 /* The flags we send back are not just the negotiated flags,
167 * they are also 'what is in this packet'. Therfore, we
168 * operate on 'chal_flags' from here on
171 chal_flags
= gensec_ntlmssp_state
->neg_flags
;
173 /* get the right name to fill in as 'target' */
174 target_name
= ntlmssp_target_name(gensec_ntlmssp_state
,
175 neg_flags
, &chal_flags
);
176 if (target_name
== NULL
)
177 return NT_STATUS_INVALID_PARAMETER
;
179 gensec_ntlmssp_state
->chal
= data_blob_talloc(gensec_ntlmssp_state
, cryptkey
, 8);
180 gensec_ntlmssp_state
->internal_chal
= data_blob_talloc(gensec_ntlmssp_state
, cryptkey
, 8);
182 /* This creates the 'blob' of names that appears at the end of the packet */
183 if (chal_flags
& NTLMSSP_NEGOTIATE_TARGET_INFO
) {
184 char dnsdomname
[MAXHOSTNAMELEN
], dnsname
[MAXHOSTNAMELEN
];
185 const char *target_name_dns
= "";
187 /* Find out the DNS domain name */
188 dnsdomname
[0] = '\0';
189 safe_strcpy(dnsdomname
, lp_realm(gensec_security
->settings
->lp_ctx
), sizeof(dnsdomname
) - 1);
190 strlower_m(dnsdomname
);
192 /* Find out the DNS host name */
193 safe_strcpy(dnsname
, gensec_ntlmssp_state
->server_name
, sizeof(dnsname
) - 1);
194 if (dnsdomname
[0] != '\0') {
195 safe_strcat(dnsname
, ".", sizeof(dnsname
) - 1);
196 safe_strcat(dnsname
, dnsdomname
, sizeof(dnsname
) - 1);
200 if (chal_flags
|= NTLMSSP_TARGET_TYPE_DOMAIN
) {
201 target_name_dns
= dnsdomname
;
202 } else if (chal_flags
|= NTLMSSP_TARGET_TYPE_SERVER
) {
203 target_name_dns
= dnsname
;
206 msrpc_gen(out_mem_ctx
,
207 &struct_blob
, "aaaaa",
208 MsvAvNbDomainName
, target_name
,
209 MsvAvNbComputerName
, gensec_ntlmssp_state
->server_name
,
210 MsvAvDnsDomainName
, dnsdomname
,
211 MsvAvDnsComputerName
, dnsname
,
214 struct_blob
= data_blob(NULL
, 0);
218 /* Marshal the packet in the right format, be it unicode or ASCII */
219 const char *gen_string
;
220 if (gensec_ntlmssp_state
->unicode
) {
221 gen_string
= "CdUdbddB";
223 gen_string
= "CdAdbddB";
226 msrpc_gen(out_mem_ctx
,
234 struct_blob
.data
, struct_blob
.length
);
237 gensec_ntlmssp_state
->expected_state
= NTLMSSP_AUTH
;
239 return NT_STATUS_MORE_PROCESSING_REQUIRED
;
243 * Next state function for the Authenticate packet
245 * @param gensec_ntlmssp_state NTLMSSP State
246 * @param request The request, as a DATA_BLOB
247 * @return Errors or NT_STATUS_OK.
250 static NTSTATUS
ntlmssp_server_preauth(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
,
251 const DATA_BLOB request
)
253 uint32_t ntlmssp_command
, auth_flags
;
256 uint8_t session_nonce_hash
[16];
258 const char *parse_string
;
261 char *workstation
= NULL
;
264 file_save("ntlmssp_auth.dat", request
.data
, request
.length
);
267 if (gensec_ntlmssp_state
->unicode
) {
268 parse_string
= "CdBBUUUBd";
270 parse_string
= "CdBBAAABd";
274 data_blob_free(&gensec_ntlmssp_state
->lm_resp
);
275 data_blob_free(&gensec_ntlmssp_state
->nt_resp
);
276 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
278 gensec_ntlmssp_state
->user
= NULL
;
279 gensec_ntlmssp_state
->domain
= NULL
;
280 gensec_ntlmssp_state
->workstation
= NULL
;
282 /* now the NTLMSSP encoded auth hashes */
283 if (!msrpc_parse(gensec_ntlmssp_state
,
284 &request
, parse_string
,
287 &gensec_ntlmssp_state
->lm_resp
,
288 &gensec_ntlmssp_state
->nt_resp
,
292 &gensec_ntlmssp_state
->encrypted_session_key
,
294 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
295 dump_data(10, request
.data
, request
.length
);
298 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
301 /* Try again with a shorter string (Win9X truncates this packet) */
302 if (gensec_ntlmssp_state
->unicode
) {
303 parse_string
= "CdBBUUU";
305 parse_string
= "CdBBAAA";
308 /* now the NTLMSSP encoded auth hashes */
309 if (!msrpc_parse(gensec_ntlmssp_state
,
310 &request
, parse_string
,
313 &gensec_ntlmssp_state
->lm_resp
,
314 &gensec_ntlmssp_state
->nt_resp
,
318 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
319 dump_data(2, request
.data
, request
.length
);
321 return NT_STATUS_INVALID_PARAMETER
;
326 ntlmssp_handle_neg_flags(gensec_ntlmssp_state
, auth_flags
, gensec_ntlmssp_state
->allow_lm_key
);
328 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_set_domain(gensec_ntlmssp_state
, domain
))) {
330 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
334 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_set_username(gensec_ntlmssp_state
, user
))) {
336 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
340 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_set_workstation(gensec_ntlmssp_state
, workstation
))) {
342 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
346 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
347 gensec_ntlmssp_state
->user
, gensec_ntlmssp_state
->domain
, gensec_ntlmssp_state
->workstation
, (unsigned long)gensec_ntlmssp_state
->lm_resp
.length
, (unsigned long)gensec_ntlmssp_state
->nt_resp
.length
));
350 file_save("nthash1.dat", &gensec_ntlmssp_state
->nt_resp
.data
, &gensec_ntlmssp_state
->nt_resp
.length
);
351 file_save("lmhash1.dat", &gensec_ntlmssp_state
->lm_resp
.data
, &gensec_ntlmssp_state
->lm_resp
.length
);
354 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
357 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
359 if (gensec_ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_NTLM2
) {
360 if (gensec_ntlmssp_state
->nt_resp
.length
== 24 && gensec_ntlmssp_state
->lm_resp
.length
== 24) {
361 struct MD5Context md5_session_nonce_ctx
;
362 SMB_ASSERT(gensec_ntlmssp_state
->internal_chal
.data
363 && gensec_ntlmssp_state
->internal_chal
.length
== 8);
365 gensec_ntlmssp_state
->doing_ntlm2
= true;
367 memcpy(gensec_ntlmssp_state
->crypt
.ntlm2
.session_nonce
, gensec_ntlmssp_state
->internal_chal
.data
, 8);
368 memcpy(&gensec_ntlmssp_state
->crypt
.ntlm2
.session_nonce
[8], gensec_ntlmssp_state
->lm_resp
.data
, 8);
370 MD5Init(&md5_session_nonce_ctx
);
371 MD5Update(&md5_session_nonce_ctx
, gensec_ntlmssp_state
->crypt
.ntlm2
.session_nonce
, 16);
372 MD5Final(session_nonce_hash
, &md5_session_nonce_ctx
);
374 gensec_ntlmssp_state
->chal
= data_blob_talloc(gensec_ntlmssp_state
,
375 session_nonce_hash
, 8);
377 /* LM response is no longer useful, zero it out */
378 data_blob_free(&gensec_ntlmssp_state
->lm_resp
);
380 /* We changed the effective challenge - set it */
381 if (!NT_STATUS_IS_OK(nt_status
=
382 gensec_ntlmssp_state
->set_challenge(gensec_ntlmssp_state
,
383 &gensec_ntlmssp_state
->chal
))) {
385 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
389 /* LM Key is incompatible... */
390 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_LM_KEY
;
397 * Next state function for the Authenticate packet
398 * (after authentication - figures out the session keys etc)
400 * @param gensec_ntlmssp_state NTLMSSP State
401 * @return Errors or NT_STATUS_OK.
404 static NTSTATUS
ntlmssp_server_postauth(struct gensec_security
*gensec_security
,
405 DATA_BLOB
*user_session_key
,
406 DATA_BLOB
*lm_session_key
)
408 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
410 DATA_BLOB session_key
= data_blob(NULL
, 0);
412 if (user_session_key
)
413 dump_data_pw("USER session key:\n", user_session_key
->data
, user_session_key
->length
);
416 dump_data_pw("LM first-8:\n", lm_session_key
->data
, lm_session_key
->length
);
418 /* Handle the different session key derivation for NTLM2 */
419 if (gensec_ntlmssp_state
->doing_ntlm2
) {
420 if (user_session_key
&& user_session_key
->data
&& user_session_key
->length
== 16) {
421 session_key
= data_blob_talloc(gensec_ntlmssp_state
, NULL
, 16);
422 hmac_md5(user_session_key
->data
, gensec_ntlmssp_state
->crypt
.ntlm2
.session_nonce
,
423 sizeof(gensec_ntlmssp_state
->crypt
.ntlm2
.session_nonce
), session_key
.data
);
424 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
425 dump_data_pw("NTLM2 session key:\n", session_key
.data
, session_key
.length
);
428 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
429 session_key
= data_blob(NULL
, 0);
431 } else if ((gensec_ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_LM_KEY
)
432 /* Ensure we can never get here on NTLMv2 */
433 && (gensec_ntlmssp_state
->nt_resp
.length
== 0 || gensec_ntlmssp_state
->nt_resp
.length
== 24)) {
435 if (lm_session_key
&& lm_session_key
->data
&& lm_session_key
->length
>= 8) {
436 if (gensec_ntlmssp_state
->lm_resp
.data
&& gensec_ntlmssp_state
->lm_resp
.length
== 24) {
437 session_key
= data_blob_talloc(gensec_ntlmssp_state
, NULL
, 16);
438 SMBsesskeygen_lm_sess_key(lm_session_key
->data
, gensec_ntlmssp_state
->lm_resp
.data
,
440 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
441 dump_data_pw("LM session key:\n", session_key
.data
, session_key
.length
);
444 /* When there is no LM response, just use zeros */
445 static const uint8_t zeros
[24];
446 session_key
= data_blob_talloc(gensec_ntlmssp_state
, NULL
, 16);
447 SMBsesskeygen_lm_sess_key(zeros
, zeros
,
449 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
450 dump_data_pw("LM session key:\n", session_key
.data
, session_key
.length
);
453 /* LM Key not selected */
454 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_LM_KEY
;
456 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
457 session_key
= data_blob(NULL
, 0);
460 } else if (user_session_key
&& user_session_key
->data
) {
461 session_key
= data_blob_talloc(gensec_ntlmssp_state
, user_session_key
->data
, user_session_key
->length
);
462 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
463 dump_data_pw("unmodified session key:\n", session_key
.data
, session_key
.length
);
465 /* LM Key not selected */
466 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_LM_KEY
;
468 } else if (lm_session_key
&& lm_session_key
->data
) {
469 /* Very weird to have LM key, but no user session key, but anyway.. */
470 session_key
= data_blob_talloc(gensec_ntlmssp_state
, lm_session_key
->data
, lm_session_key
->length
);
471 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
472 dump_data_pw("unmodified session key:\n", session_key
.data
, session_key
.length
);
474 /* LM Key not selected */
475 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_LM_KEY
;
478 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
479 session_key
= data_blob(NULL
, 0);
481 /* LM Key not selected */
482 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_LM_KEY
;
485 /* With KEY_EXCH, the client supplies the proposed session key,
486 but encrypts it with the long-term key */
487 if (gensec_ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_KEY_EXCH
) {
488 if (!gensec_ntlmssp_state
->encrypted_session_key
.data
489 || gensec_ntlmssp_state
->encrypted_session_key
.length
!= 16) {
490 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
491 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
492 (unsigned)gensec_ntlmssp_state
->encrypted_session_key
.length
));
493 return NT_STATUS_INVALID_PARAMETER
;
494 } else if (!session_key
.data
|| session_key
.length
!= 16) {
495 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
496 (unsigned)session_key
.length
));
497 gensec_ntlmssp_state
->session_key
= session_key
;
499 dump_data_pw("KEY_EXCH session key (enc):\n",
500 gensec_ntlmssp_state
->encrypted_session_key
.data
,
501 gensec_ntlmssp_state
->encrypted_session_key
.length
);
502 arcfour_crypt(gensec_ntlmssp_state
->encrypted_session_key
.data
,
504 gensec_ntlmssp_state
->encrypted_session_key
.length
);
505 gensec_ntlmssp_state
->session_key
= data_blob_talloc(gensec_ntlmssp_state
,
506 gensec_ntlmssp_state
->encrypted_session_key
.data
,
507 gensec_ntlmssp_state
->encrypted_session_key
.length
);
508 dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state
->encrypted_session_key
.data
,
509 gensec_ntlmssp_state
->encrypted_session_key
.length
);
510 talloc_free(session_key
.data
);
513 gensec_ntlmssp_state
->session_key
= session_key
;
516 if ((gensec_security
->want_features
& GENSEC_FEATURE_SIGN
)
517 || (gensec_security
->want_features
& GENSEC_FEATURE_SEAL
)) {
518 nt_status
= ntlmssp_sign_init(gensec_ntlmssp_state
);
520 nt_status
= NT_STATUS_OK
;
523 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
525 /* allow arbitarily many authentications, but watch that this will cause a
526 memory leak, until the gensec_ntlmssp_state is shutdown
529 if (gensec_ntlmssp_state
->server_multiple_authentications
) {
530 gensec_ntlmssp_state
->expected_state
= NTLMSSP_AUTH
;
532 gensec_ntlmssp_state
->expected_state
= NTLMSSP_DONE
;
540 * Next state function for the Authenticate packet
542 * @param gensec_security GENSEC state
543 * @param out_mem_ctx Memory context for *out
544 * @param in The request, as a DATA_BLOB. reply.data must be NULL
545 * @param out The reply, as an allocated DATA_BLOB, caller to free.
546 * @return Errors or NT_STATUS_OK if authentication sucessful
549 NTSTATUS
ntlmssp_server_auth(struct gensec_security
*gensec_security
,
550 TALLOC_CTX
*out_mem_ctx
,
551 const DATA_BLOB in
, DATA_BLOB
*out
)
553 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
554 DATA_BLOB user_session_key
= data_blob(NULL
, 0);
555 DATA_BLOB lm_session_key
= data_blob(NULL
, 0);
558 TALLOC_CTX
*mem_ctx
= talloc_new(out_mem_ctx
);
560 return NT_STATUS_NO_MEMORY
;
563 /* zero the outbound NTLMSSP packet */
564 *out
= data_blob_talloc(out_mem_ctx
, NULL
, 0);
566 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_server_preauth(gensec_ntlmssp_state
, in
))) {
567 talloc_free(mem_ctx
);
572 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
573 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
574 * smb.conf file) and no NTLMv2 response was sent then the password check
575 * will fail here. JRA.
578 /* Finally, actually ask if the password is OK */
580 if (!NT_STATUS_IS_OK(nt_status
= gensec_ntlmssp_state
->check_password(gensec_ntlmssp_state
, mem_ctx
,
581 &user_session_key
, &lm_session_key
))) {
582 talloc_free(mem_ctx
);
586 if (gensec_security
->want_features
587 & (GENSEC_FEATURE_SIGN
|GENSEC_FEATURE_SEAL
|GENSEC_FEATURE_SESSION_KEY
)) {
588 nt_status
= ntlmssp_server_postauth(gensec_security
, &user_session_key
, &lm_session_key
);
589 talloc_free(mem_ctx
);
592 gensec_ntlmssp_state
->session_key
= data_blob(NULL
, 0);
593 talloc_free(mem_ctx
);
599 * Return the challenge as determined by the authentication subsystem
600 * @return an 8 byte random challenge
603 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state
*gensec_ntlmssp_state
)
608 status
= gensec_ntlmssp_state
->auth_context
->get_challenge(gensec_ntlmssp_state
->auth_context
, &chal
);
609 if (!NT_STATUS_IS_OK(status
)) {
610 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
619 * Some authentication methods 'fix' the challenge, so we may not be able to set it
621 * @return If the effective challenge used by the auth subsystem may be modified
623 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state
*gensec_ntlmssp_state
)
625 return gensec_ntlmssp_state
->auth_context
->challenge_may_be_modified(gensec_ntlmssp_state
->auth_context
);
629 * NTLM2 authentication modifies the effective challenge,
630 * @param challenge The new challenge value
632 static NTSTATUS
auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
, DATA_BLOB
*challenge
)
635 struct auth_context
*auth_context
= gensec_ntlmssp_state
->auth_context
;
638 if (challenge
->length
!= 8) {
639 return NT_STATUS_INVALID_PARAMETER
;
642 chal
= challenge
->data
;
644 nt_status
= gensec_ntlmssp_state
->auth_context
->set_challenge(auth_context
,
646 "NTLMSSP callback (NTLM2)");
652 * Check the password on an NTLMSSP login.
654 * Return the session keys used on the connection.
657 static NTSTATUS
auth_ntlmssp_check_password(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
,
659 DATA_BLOB
*user_session_key
, DATA_BLOB
*lm_session_key
)
662 struct auth_usersupplied_info
*user_info
= talloc(mem_ctx
, struct auth_usersupplied_info
);
664 return NT_STATUS_NO_MEMORY
;
667 user_info
->logon_parameters
= MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT
| MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT
;
668 user_info
->flags
= 0;
669 user_info
->mapped_state
= false;
670 user_info
->client
.account_name
= gensec_ntlmssp_state
->user
;
671 user_info
->client
.domain_name
= gensec_ntlmssp_state
->domain
;
672 user_info
->workstation_name
= gensec_ntlmssp_state
->workstation
;
673 user_info
->remote_host
= gensec_get_peer_addr(gensec_ntlmssp_state
->gensec_security
);
675 user_info
->password_state
= AUTH_PASSWORD_RESPONSE
;
676 user_info
->password
.response
.lanman
= gensec_ntlmssp_state
->lm_resp
;
677 user_info
->password
.response
.lanman
.data
= talloc_steal(user_info
, gensec_ntlmssp_state
->lm_resp
.data
);
678 user_info
->password
.response
.nt
= gensec_ntlmssp_state
->nt_resp
;
679 user_info
->password
.response
.nt
.data
= talloc_steal(user_info
, gensec_ntlmssp_state
->nt_resp
.data
);
681 nt_status
= gensec_ntlmssp_state
->auth_context
->check_password(gensec_ntlmssp_state
->auth_context
,
684 &gensec_ntlmssp_state
->server_info
);
685 talloc_free(user_info
);
686 NT_STATUS_NOT_OK_RETURN(nt_status
);
688 talloc_steal(gensec_ntlmssp_state
, gensec_ntlmssp_state
->server_info
);
690 if (gensec_ntlmssp_state
->server_info
->user_session_key
.length
) {
691 DEBUG(10, ("Got NT session key of length %u\n",
692 (unsigned)gensec_ntlmssp_state
->server_info
->user_session_key
.length
));
693 if (!talloc_reference(mem_ctx
, gensec_ntlmssp_state
->server_info
->user_session_key
.data
)) {
694 return NT_STATUS_NO_MEMORY
;
697 *user_session_key
= gensec_ntlmssp_state
->server_info
->user_session_key
;
699 if (gensec_ntlmssp_state
->server_info
->lm_session_key
.length
) {
700 DEBUG(10, ("Got LM session key of length %u\n",
701 (unsigned)gensec_ntlmssp_state
->server_info
->lm_session_key
.length
));
702 if (!talloc_reference(mem_ctx
, gensec_ntlmssp_state
->server_info
->lm_session_key
.data
)) {
703 return NT_STATUS_NO_MEMORY
;
706 *lm_session_key
= gensec_ntlmssp_state
->server_info
->lm_session_key
;
712 * Return the credentials of a logged on user, including session keys
715 * Only valid after a successful authentication
717 * May only be called once per authentication.
721 NTSTATUS
gensec_ntlmssp_session_info(struct gensec_security
*gensec_security
,
722 struct auth_session_info
**session_info
)
725 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
727 nt_status
= auth_generate_session_info(gensec_ntlmssp_state
, gensec_security
->event_ctx
, gensec_security
->settings
->lp_ctx
, gensec_ntlmssp_state
->server_info
, session_info
);
728 NT_STATUS_NOT_OK_RETURN(nt_status
);
730 (*session_info
)->session_key
= data_blob_talloc(*session_info
,
731 gensec_ntlmssp_state
->session_key
.data
,
732 gensec_ntlmssp_state
->session_key
.length
);
738 * Start NTLMSSP on the server side
741 NTSTATUS
gensec_ntlmssp_server_start(struct gensec_security
*gensec_security
)
744 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
;
746 nt_status
= gensec_ntlmssp_start(gensec_security
);
747 NT_STATUS_NOT_OK_RETURN(nt_status
);
749 gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
751 gensec_ntlmssp_state
->role
= NTLMSSP_SERVER
;
753 gensec_ntlmssp_state
->workstation
= NULL
;
754 gensec_ntlmssp_state
->server_name
= lp_netbios_name(gensec_security
->settings
->lp_ctx
);
756 gensec_ntlmssp_state
->domain
= lp_workgroup(gensec_security
->settings
->lp_ctx
);
758 gensec_ntlmssp_state
->expected_state
= NTLMSSP_NEGOTIATE
;
760 gensec_ntlmssp_state
->allow_lm_key
= (lp_lanman_auth(gensec_security
->settings
->lp_ctx
)
761 && gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "allow_lm_key", false));
763 gensec_ntlmssp_state
->server_multiple_authentications
= false;
765 gensec_ntlmssp_state
->neg_flags
=
766 NTLMSSP_NEGOTIATE_NTLM
| NTLMSSP_NEGOTIATE_VERSION
;
768 gensec_ntlmssp_state
->lm_resp
= data_blob(NULL
, 0);
769 gensec_ntlmssp_state
->nt_resp
= data_blob(NULL
, 0);
770 gensec_ntlmssp_state
->encrypted_session_key
= data_blob(NULL
, 0);
772 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "128bit", true)) {
773 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_128
;
776 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "56bit", true)) {
777 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_56
;
780 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "keyexchange", true)) {
781 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_KEY_EXCH
;
784 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "alwayssign", true)) {
785 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_ALWAYS_SIGN
;
788 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "ntlm2", true)) {
789 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_NTLM2
;
792 if (gensec_security
->want_features
& GENSEC_FEATURE_SIGN
) {
793 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_SIGN
;
795 if (gensec_security
->want_features
& GENSEC_FEATURE_SEAL
) {
796 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_SEAL
;
799 gensec_ntlmssp_state
->auth_context
= gensec_security
->auth_context
;
801 gensec_ntlmssp_state
->get_challenge
= auth_ntlmssp_get_challenge
;
802 gensec_ntlmssp_state
->may_set_challenge
= auth_ntlmssp_may_set_challenge
;
803 gensec_ntlmssp_state
->set_challenge
= auth_ntlmssp_set_challenge
;
804 gensec_ntlmssp_state
->check_password
= auth_ntlmssp_check_password
;
805 gensec_ntlmssp_state
->server_role
= lp_server_role(gensec_security
->settings
->lp_ctx
);