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 "auth/ntlmssp/msrpc_parse.h"
28 #include "../lib/crypto/crypto.h"
29 #include "libcli/auth/libcli_auth.h"
30 #include "auth/credentials/credentials.h"
31 #include "auth/gensec/gensec.h"
32 #include "auth/auth.h"
33 #include "auth/ntlm/auth_proto.h"
34 #include "param/param.h"
35 #include "auth/session_proto.h"
38 * Set a username on an NTLMSSP context - ensures it is talloc()ed
42 static NTSTATUS
ntlmssp_set_username(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
, const char *user
)
45 /* it should be at least "" */
46 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
47 return NT_STATUS_INVALID_PARAMETER
;
49 gensec_ntlmssp_state
->user
= talloc_strdup(gensec_ntlmssp_state
, user
);
50 if (!gensec_ntlmssp_state
->user
) {
51 return NT_STATUS_NO_MEMORY
;
57 * Set a domain on an NTLMSSP context - ensures it is talloc()ed
60 static NTSTATUS
ntlmssp_set_domain(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
, const char *domain
)
62 gensec_ntlmssp_state
->domain
= talloc_strdup(gensec_ntlmssp_state
, domain
);
63 if (!gensec_ntlmssp_state
->domain
) {
64 return NT_STATUS_NO_MEMORY
;
70 * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
73 static NTSTATUS
ntlmssp_set_workstation(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
, const char *workstation
)
75 gensec_ntlmssp_state
->workstation
= talloc_strdup(gensec_ntlmssp_state
, workstation
);
76 if (!gensec_ntlmssp_state
->workstation
) {
77 return NT_STATUS_NO_MEMORY
;
83 * Determine correct target name flags for reply, given server role
84 * and negotiated flags
86 * @param gensec_ntlmssp_state NTLMSSP State
87 * @param neg_flags The flags from the packet
88 * @param chal_flags The flags to be set in the reply packet
89 * @return The 'target name' string.
92 static const char *ntlmssp_target_name(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
,
93 uint32_t neg_flags
, uint32_t *chal_flags
)
95 if (neg_flags
& NTLMSSP_REQUEST_TARGET
) {
96 *chal_flags
|= NTLMSSP_CHAL_TARGET_INFO
;
97 *chal_flags
|= NTLMSSP_REQUEST_TARGET
;
98 if (gensec_ntlmssp_state
->server_role
== ROLE_STANDALONE
) {
99 *chal_flags
|= NTLMSSP_TARGET_TYPE_SERVER
;
100 return gensec_ntlmssp_state
->server_name
;
102 *chal_flags
|= NTLMSSP_TARGET_TYPE_DOMAIN
;
103 return gensec_ntlmssp_state
->domain
;
113 * Next state function for the Negotiate packet
115 * @param gensec_security GENSEC state
116 * @param out_mem_ctx Memory context for *out
117 * @param in The request, as a DATA_BLOB. reply.data must be NULL
118 * @param out The reply, as an allocated DATA_BLOB, caller to free.
119 * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
122 NTSTATUS
ntlmssp_server_negotiate(struct gensec_security
*gensec_security
,
123 TALLOC_CTX
*out_mem_ctx
,
124 const DATA_BLOB in
, DATA_BLOB
*out
)
126 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
127 DATA_BLOB struct_blob
;
128 uint32_t neg_flags
= 0;
129 uint32_t ntlmssp_command
, chal_flags
;
130 const uint8_t *cryptkey
;
131 const char *target_name
;
133 /* parse the NTLMSSP packet */
135 file_save("ntlmssp_negotiate.dat", request
.data
, request
.length
);
139 if ((in
.length
< 16) || !msrpc_parse(out_mem_ctx
,
144 DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
145 "NTLMSSP Negotiate of length %u:\n",
146 (unsigned int)in
.length
));
147 dump_data(2, in
.data
, in
.length
);
148 return NT_STATUS_INVALID_PARAMETER
;
150 debug_ntlmssp_flags(neg_flags
);
153 ntlmssp_handle_neg_flags(gensec_ntlmssp_state
, neg_flags
, gensec_ntlmssp_state
->allow_lm_key
);
155 /* Ask our caller what challenge they would like in the packet */
156 cryptkey
= gensec_ntlmssp_state
->get_challenge(gensec_ntlmssp_state
);
158 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
159 return NT_STATUS_INTERNAL_ERROR
;
162 /* Check if we may set the challenge */
163 if (!gensec_ntlmssp_state
->may_set_challenge(gensec_ntlmssp_state
)) {
164 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_NTLM2
;
167 /* The flags we send back are not just the negotiated flags,
168 * they are also 'what is in this packet'. Therfore, we
169 * operate on 'chal_flags' from here on
172 chal_flags
= gensec_ntlmssp_state
->neg_flags
;
174 /* get the right name to fill in as 'target' */
175 target_name
= ntlmssp_target_name(gensec_ntlmssp_state
,
176 neg_flags
, &chal_flags
);
177 if (target_name
== NULL
)
178 return NT_STATUS_INVALID_PARAMETER
;
180 gensec_ntlmssp_state
->chal
= data_blob_talloc(gensec_ntlmssp_state
, cryptkey
, 8);
181 gensec_ntlmssp_state
->internal_chal
= data_blob_talloc(gensec_ntlmssp_state
, cryptkey
, 8);
183 /* This creates the 'blob' of names that appears at the end of the packet */
184 if (chal_flags
& NTLMSSP_CHAL_TARGET_INFO
) {
185 char dnsdomname
[MAXHOSTNAMELEN
], dnsname
[MAXHOSTNAMELEN
];
186 const char *target_name_dns
= "";
188 /* Find out the DNS domain name */
189 dnsdomname
[0] = '\0';
190 safe_strcpy(dnsdomname
, lp_realm(gensec_security
->settings
->lp_ctx
), sizeof(dnsdomname
) - 1);
191 strlower_m(dnsdomname
);
193 /* Find out the DNS host name */
194 safe_strcpy(dnsname
, gensec_ntlmssp_state
->server_name
, sizeof(dnsname
) - 1);
195 if (dnsdomname
[0] != '\0') {
196 safe_strcat(dnsname
, ".", sizeof(dnsname
) - 1);
197 safe_strcat(dnsname
, dnsdomname
, sizeof(dnsname
) - 1);
201 if (chal_flags
|= NTLMSSP_TARGET_TYPE_DOMAIN
) {
202 target_name_dns
= dnsdomname
;
203 } else if (chal_flags
|= NTLMSSP_TARGET_TYPE_SERVER
) {
204 target_name_dns
= dnsname
;
207 msrpc_gen(out_mem_ctx
,
208 &struct_blob
, "aaaaa",
209 NTLMSSP_NAME_TYPE_DOMAIN
, target_name
,
210 NTLMSSP_NAME_TYPE_SERVER
, gensec_ntlmssp_state
->server_name
,
211 NTLMSSP_NAME_TYPE_DOMAIN_DNS
, dnsdomname
,
212 NTLMSSP_NAME_TYPE_SERVER_DNS
, dnsname
,
215 struct_blob
= data_blob(NULL
, 0);
219 /* Marshal the packet in the right format, be it unicode or ASCII */
220 const char *gen_string
;
221 if (gensec_ntlmssp_state
->unicode
) {
222 gen_string
= "CdUdbddB";
224 gen_string
= "CdAdbddB";
227 msrpc_gen(out_mem_ctx
,
235 struct_blob
.data
, struct_blob
.length
);
238 gensec_ntlmssp_state
->expected_state
= NTLMSSP_AUTH
;
240 return NT_STATUS_MORE_PROCESSING_REQUIRED
;
244 * Next state function for the Authenticate packet
246 * @param gensec_ntlmssp_state NTLMSSP State
247 * @param request The request, as a DATA_BLOB
248 * @return Errors or NT_STATUS_OK.
251 static NTSTATUS
ntlmssp_server_preauth(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
,
252 const DATA_BLOB request
)
254 uint32_t ntlmssp_command
, auth_flags
;
257 uint8_t session_nonce_hash
[16];
259 const char *parse_string
;
262 char *workstation
= NULL
;
265 file_save("ntlmssp_auth.dat", request
.data
, request
.length
);
268 if (gensec_ntlmssp_state
->unicode
) {
269 parse_string
= "CdBBUUUBd";
271 parse_string
= "CdBBAAABd";
275 data_blob_free(&gensec_ntlmssp_state
->lm_resp
);
276 data_blob_free(&gensec_ntlmssp_state
->nt_resp
);
277 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
279 gensec_ntlmssp_state
->user
= NULL
;
280 gensec_ntlmssp_state
->domain
= NULL
;
281 gensec_ntlmssp_state
->workstation
= NULL
;
283 /* now the NTLMSSP encoded auth hashes */
284 if (!msrpc_parse(gensec_ntlmssp_state
,
285 &request
, parse_string
,
288 &gensec_ntlmssp_state
->lm_resp
,
289 &gensec_ntlmssp_state
->nt_resp
,
293 &gensec_ntlmssp_state
->encrypted_session_key
,
295 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
296 dump_data(10, request
.data
, request
.length
);
299 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
302 /* Try again with a shorter string (Win9X truncates this packet) */
303 if (gensec_ntlmssp_state
->unicode
) {
304 parse_string
= "CdBBUUU";
306 parse_string
= "CdBBAAA";
309 /* now the NTLMSSP encoded auth hashes */
310 if (!msrpc_parse(gensec_ntlmssp_state
,
311 &request
, parse_string
,
314 &gensec_ntlmssp_state
->lm_resp
,
315 &gensec_ntlmssp_state
->nt_resp
,
319 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
320 dump_data(2, request
.data
, request
.length
);
322 return NT_STATUS_INVALID_PARAMETER
;
327 ntlmssp_handle_neg_flags(gensec_ntlmssp_state
, auth_flags
, gensec_ntlmssp_state
->allow_lm_key
);
329 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_set_domain(gensec_ntlmssp_state
, domain
))) {
331 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
335 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_set_username(gensec_ntlmssp_state
, user
))) {
337 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
341 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_set_workstation(gensec_ntlmssp_state
, workstation
))) {
343 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
347 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
348 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
));
351 file_save("nthash1.dat", &gensec_ntlmssp_state
->nt_resp
.data
, &gensec_ntlmssp_state
->nt_resp
.length
);
352 file_save("lmhash1.dat", &gensec_ntlmssp_state
->lm_resp
.data
, &gensec_ntlmssp_state
->lm_resp
.length
);
355 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
358 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
360 if (gensec_ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_NTLM2
) {
361 if (gensec_ntlmssp_state
->nt_resp
.length
== 24 && gensec_ntlmssp_state
->lm_resp
.length
== 24) {
362 struct MD5Context md5_session_nonce_ctx
;
363 SMB_ASSERT(gensec_ntlmssp_state
->internal_chal
.data
364 && gensec_ntlmssp_state
->internal_chal
.length
== 8);
366 gensec_ntlmssp_state
->doing_ntlm2
= true;
368 memcpy(gensec_ntlmssp_state
->crypt
.ntlm2
.session_nonce
, gensec_ntlmssp_state
->internal_chal
.data
, 8);
369 memcpy(&gensec_ntlmssp_state
->crypt
.ntlm2
.session_nonce
[8], gensec_ntlmssp_state
->lm_resp
.data
, 8);
371 MD5Init(&md5_session_nonce_ctx
);
372 MD5Update(&md5_session_nonce_ctx
, gensec_ntlmssp_state
->crypt
.ntlm2
.session_nonce
, 16);
373 MD5Final(session_nonce_hash
, &md5_session_nonce_ctx
);
375 gensec_ntlmssp_state
->chal
= data_blob_talloc(gensec_ntlmssp_state
,
376 session_nonce_hash
, 8);
378 /* LM response is no longer useful, zero it out */
379 data_blob_free(&gensec_ntlmssp_state
->lm_resp
);
381 /* We changed the effective challenge - set it */
382 if (!NT_STATUS_IS_OK(nt_status
=
383 gensec_ntlmssp_state
->set_challenge(gensec_ntlmssp_state
,
384 &gensec_ntlmssp_state
->chal
))) {
386 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
390 /* LM Key is incompatible... */
391 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_LM_KEY
;
398 * Next state function for the Authenticate packet
399 * (after authentication - figures out the session keys etc)
401 * @param gensec_ntlmssp_state NTLMSSP State
402 * @return Errors or NT_STATUS_OK.
405 static NTSTATUS
ntlmssp_server_postauth(struct gensec_security
*gensec_security
,
406 DATA_BLOB
*user_session_key
,
407 DATA_BLOB
*lm_session_key
)
409 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
411 DATA_BLOB session_key
= data_blob(NULL
, 0);
413 if (user_session_key
)
414 dump_data_pw("USER session key:\n", user_session_key
->data
, user_session_key
->length
);
417 dump_data_pw("LM first-8:\n", lm_session_key
->data
, lm_session_key
->length
);
419 /* Handle the different session key derivation for NTLM2 */
420 if (gensec_ntlmssp_state
->doing_ntlm2
) {
421 if (user_session_key
&& user_session_key
->data
&& user_session_key
->length
== 16) {
422 session_key
= data_blob_talloc(gensec_ntlmssp_state
, NULL
, 16);
423 hmac_md5(user_session_key
->data
, gensec_ntlmssp_state
->crypt
.ntlm2
.session_nonce
,
424 sizeof(gensec_ntlmssp_state
->crypt
.ntlm2
.session_nonce
), session_key
.data
);
425 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
426 dump_data_pw("NTLM2 session key:\n", session_key
.data
, session_key
.length
);
429 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
430 session_key
= data_blob(NULL
, 0);
432 } else if ((gensec_ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_LM_KEY
)
433 /* Ensure we can never get here on NTLMv2 */
434 && (gensec_ntlmssp_state
->nt_resp
.length
== 0 || gensec_ntlmssp_state
->nt_resp
.length
== 24)) {
436 if (lm_session_key
&& lm_session_key
->data
&& lm_session_key
->length
>= 8) {
437 if (gensec_ntlmssp_state
->lm_resp
.data
&& gensec_ntlmssp_state
->lm_resp
.length
== 24) {
438 session_key
= data_blob_talloc(gensec_ntlmssp_state
, NULL
, 16);
439 SMBsesskeygen_lm_sess_key(lm_session_key
->data
, gensec_ntlmssp_state
->lm_resp
.data
,
441 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
442 dump_data_pw("LM session key:\n", session_key
.data
, session_key
.length
);
445 /* When there is no LM response, just use zeros */
446 static const uint8_t zeros
[24];
447 session_key
= data_blob_talloc(gensec_ntlmssp_state
, NULL
, 16);
448 SMBsesskeygen_lm_sess_key(zeros
, zeros
,
450 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
451 dump_data_pw("LM session key:\n", session_key
.data
, session_key
.length
);
454 /* LM Key not selected */
455 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_LM_KEY
;
457 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
458 session_key
= data_blob(NULL
, 0);
461 } else if (user_session_key
&& user_session_key
->data
) {
462 session_key
= *user_session_key
;
463 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
464 dump_data_pw("unmodified session key:\n", session_key
.data
, session_key
.length
);
466 /* LM Key not selected */
467 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_LM_KEY
;
469 } else if (lm_session_key
&& lm_session_key
->data
) {
470 /* Very weird to have LM key, but no user session key, but anyway.. */
471 session_key
= *lm_session_key
;
472 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
473 dump_data_pw("unmodified session key:\n", session_key
.data
, session_key
.length
);
475 /* LM Key not selected */
476 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_LM_KEY
;
479 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
480 session_key
= data_blob(NULL
, 0);
482 /* LM Key not selected */
483 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_LM_KEY
;
486 /* With KEY_EXCH, the client supplies the proposed session key,
487 but encrypts it with the long-term key */
488 if (gensec_ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_KEY_EXCH
) {
489 if (!gensec_ntlmssp_state
->encrypted_session_key
.data
490 || gensec_ntlmssp_state
->encrypted_session_key
.length
!= 16) {
491 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
492 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
493 (unsigned)gensec_ntlmssp_state
->encrypted_session_key
.length
));
494 return NT_STATUS_INVALID_PARAMETER
;
495 } else if (!session_key
.data
|| session_key
.length
!= 16) {
496 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
497 (unsigned)session_key
.length
));
498 gensec_ntlmssp_state
->session_key
= session_key
;
500 dump_data_pw("KEY_EXCH session key (enc):\n",
501 gensec_ntlmssp_state
->encrypted_session_key
.data
,
502 gensec_ntlmssp_state
->encrypted_session_key
.length
);
503 arcfour_crypt(gensec_ntlmssp_state
->encrypted_session_key
.data
,
505 gensec_ntlmssp_state
->encrypted_session_key
.length
);
506 gensec_ntlmssp_state
->session_key
= data_blob_talloc(gensec_ntlmssp_state
,
507 gensec_ntlmssp_state
->encrypted_session_key
.data
,
508 gensec_ntlmssp_state
->encrypted_session_key
.length
);
509 dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state
->encrypted_session_key
.data
,
510 gensec_ntlmssp_state
->encrypted_session_key
.length
);
513 gensec_ntlmssp_state
->session_key
= session_key
;
516 /* keep the session key around on the new context */
517 talloc_steal(gensec_ntlmssp_state
, session_key
.data
);
519 if ((gensec_security
->want_features
& GENSEC_FEATURE_SIGN
)
520 || (gensec_security
->want_features
& GENSEC_FEATURE_SEAL
)) {
521 nt_status
= ntlmssp_sign_init(gensec_ntlmssp_state
);
523 nt_status
= NT_STATUS_OK
;
526 data_blob_free(&gensec_ntlmssp_state
->encrypted_session_key
);
528 /* allow arbitarily many authentications, but watch that this will cause a
529 memory leak, until the gensec_ntlmssp_state is shutdown
532 if (gensec_ntlmssp_state
->server_multiple_authentications
) {
533 gensec_ntlmssp_state
->expected_state
= NTLMSSP_AUTH
;
535 gensec_ntlmssp_state
->expected_state
= NTLMSSP_DONE
;
543 * Next state function for the Authenticate packet
545 * @param gensec_security GENSEC state
546 * @param out_mem_ctx Memory context for *out
547 * @param in The request, as a DATA_BLOB. reply.data must be NULL
548 * @param out The reply, as an allocated DATA_BLOB, caller to free.
549 * @return Errors or NT_STATUS_OK if authentication sucessful
552 NTSTATUS
ntlmssp_server_auth(struct gensec_security
*gensec_security
,
553 TALLOC_CTX
*out_mem_ctx
,
554 const DATA_BLOB in
, DATA_BLOB
*out
)
556 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
557 DATA_BLOB user_session_key
= data_blob(NULL
, 0);
558 DATA_BLOB lm_session_key
= data_blob(NULL
, 0);
561 TALLOC_CTX
*mem_ctx
= talloc_new(out_mem_ctx
);
563 return NT_STATUS_NO_MEMORY
;
566 /* zero the outbound NTLMSSP packet */
567 *out
= data_blob_talloc(out_mem_ctx
, NULL
, 0);
569 if (!NT_STATUS_IS_OK(nt_status
= ntlmssp_server_preauth(gensec_ntlmssp_state
, in
))) {
570 talloc_free(mem_ctx
);
575 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
576 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
577 * smb.conf file) and no NTLMv2 response was sent then the password check
578 * will fail here. JRA.
581 /* Finally, actually ask if the password is OK */
583 if (!NT_STATUS_IS_OK(nt_status
= gensec_ntlmssp_state
->check_password(gensec_ntlmssp_state
, mem_ctx
,
584 &user_session_key
, &lm_session_key
))) {
585 talloc_free(mem_ctx
);
589 if (gensec_security
->want_features
590 & (GENSEC_FEATURE_SIGN
|GENSEC_FEATURE_SEAL
|GENSEC_FEATURE_SESSION_KEY
)) {
591 nt_status
= ntlmssp_server_postauth(gensec_security
, &user_session_key
, &lm_session_key
);
592 talloc_free(mem_ctx
);
595 gensec_ntlmssp_state
->session_key
= data_blob(NULL
, 0);
596 talloc_free(mem_ctx
);
602 * Return the challenge as determined by the authentication subsystem
603 * @return an 8 byte random challenge
606 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state
*gensec_ntlmssp_state
)
611 status
= gensec_ntlmssp_state
->auth_context
->get_challenge(gensec_ntlmssp_state
->auth_context
, &chal
);
612 if (!NT_STATUS_IS_OK(status
)) {
613 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
622 * Some authentication methods 'fix' the challenge, so we may not be able to set it
624 * @return If the effective challenge used by the auth subsystem may be modified
626 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state
*gensec_ntlmssp_state
)
628 return gensec_ntlmssp_state
->auth_context
->challenge_may_be_modified(gensec_ntlmssp_state
->auth_context
);
632 * NTLM2 authentication modifies the effective challenge,
633 * @param challenge The new challenge value
635 static NTSTATUS
auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
, DATA_BLOB
*challenge
)
638 struct auth_context
*auth_context
= gensec_ntlmssp_state
->auth_context
;
641 if (challenge
->length
!= 8) {
642 return NT_STATUS_INVALID_PARAMETER
;
645 chal
= challenge
->data
;
647 nt_status
= gensec_ntlmssp_state
->auth_context
->set_challenge(auth_context
,
649 "NTLMSSP callback (NTLM2)");
655 * Check the password on an NTLMSSP login.
657 * Return the session keys used on the connection.
660 static NTSTATUS
auth_ntlmssp_check_password(struct gensec_ntlmssp_state
*gensec_ntlmssp_state
,
662 DATA_BLOB
*user_session_key
, DATA_BLOB
*lm_session_key
)
665 struct auth_usersupplied_info
*user_info
= talloc(mem_ctx
, struct auth_usersupplied_info
);
667 return NT_STATUS_NO_MEMORY
;
670 user_info
->logon_parameters
= MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT
| MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT
;
671 user_info
->flags
= 0;
672 user_info
->mapped_state
= false;
673 user_info
->client
.account_name
= gensec_ntlmssp_state
->user
;
674 user_info
->client
.domain_name
= gensec_ntlmssp_state
->domain
;
675 user_info
->workstation_name
= gensec_ntlmssp_state
->workstation
;
676 user_info
->remote_host
= gensec_get_peer_addr(gensec_ntlmssp_state
->gensec_security
);
678 user_info
->password_state
= AUTH_PASSWORD_RESPONSE
;
679 user_info
->password
.response
.lanman
= gensec_ntlmssp_state
->lm_resp
;
680 user_info
->password
.response
.lanman
.data
= talloc_steal(user_info
, gensec_ntlmssp_state
->lm_resp
.data
);
681 user_info
->password
.response
.nt
= gensec_ntlmssp_state
->nt_resp
;
682 user_info
->password
.response
.nt
.data
= talloc_steal(user_info
, gensec_ntlmssp_state
->nt_resp
.data
);
684 nt_status
= gensec_ntlmssp_state
->auth_context
->check_password(gensec_ntlmssp_state
->auth_context
,
687 &gensec_ntlmssp_state
->server_info
);
688 talloc_free(user_info
);
689 NT_STATUS_NOT_OK_RETURN(nt_status
);
691 talloc_steal(gensec_ntlmssp_state
, gensec_ntlmssp_state
->server_info
);
693 if (gensec_ntlmssp_state
->server_info
->user_session_key
.length
) {
694 DEBUG(10, ("Got NT session key of length %u\n",
695 (unsigned)gensec_ntlmssp_state
->server_info
->user_session_key
.length
));
696 if (!talloc_reference(mem_ctx
, gensec_ntlmssp_state
->server_info
->user_session_key
.data
)) {
697 return NT_STATUS_NO_MEMORY
;
700 *user_session_key
= gensec_ntlmssp_state
->server_info
->user_session_key
;
702 if (gensec_ntlmssp_state
->server_info
->lm_session_key
.length
) {
703 DEBUG(10, ("Got LM session key of length %u\n",
704 (unsigned)gensec_ntlmssp_state
->server_info
->lm_session_key
.length
));
705 if (!talloc_reference(mem_ctx
, gensec_ntlmssp_state
->server_info
->lm_session_key
.data
)) {
706 return NT_STATUS_NO_MEMORY
;
709 *lm_session_key
= gensec_ntlmssp_state
->server_info
->lm_session_key
;
715 * Return the credentials of a logged on user, including session keys
718 * Only valid after a successful authentication
720 * May only be called once per authentication.
724 NTSTATUS
gensec_ntlmssp_session_info(struct gensec_security
*gensec_security
,
725 struct auth_session_info
**session_info
)
728 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
730 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
);
731 NT_STATUS_NOT_OK_RETURN(nt_status
);
733 (*session_info
)->session_key
= data_blob_talloc(*session_info
,
734 gensec_ntlmssp_state
->session_key
.data
,
735 gensec_ntlmssp_state
->session_key
.length
);
741 * Start NTLMSSP on the server side
744 NTSTATUS
gensec_ntlmssp_server_start(struct gensec_security
*gensec_security
)
747 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
;
749 nt_status
= gensec_ntlmssp_start(gensec_security
);
750 NT_STATUS_NOT_OK_RETURN(nt_status
);
752 gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
754 gensec_ntlmssp_state
->role
= NTLMSSP_SERVER
;
756 gensec_ntlmssp_state
->workstation
= NULL
;
757 gensec_ntlmssp_state
->server_name
= lp_netbios_name(gensec_security
->settings
->lp_ctx
);
759 gensec_ntlmssp_state
->domain
= lp_workgroup(gensec_security
->settings
->lp_ctx
);
761 gensec_ntlmssp_state
->expected_state
= NTLMSSP_NEGOTIATE
;
763 gensec_ntlmssp_state
->allow_lm_key
= (lp_lanman_auth(gensec_security
->settings
->lp_ctx
)
764 && gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "allow_lm_key", false));
766 gensec_ntlmssp_state
->server_multiple_authentications
= false;
768 gensec_ntlmssp_state
->neg_flags
=
769 NTLMSSP_NEGOTIATE_NTLM
| NTLMSSP_UNKNOWN_02000000
;
771 gensec_ntlmssp_state
->lm_resp
= data_blob(NULL
, 0);
772 gensec_ntlmssp_state
->nt_resp
= data_blob(NULL
, 0);
773 gensec_ntlmssp_state
->encrypted_session_key
= data_blob(NULL
, 0);
775 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "128bit", true)) {
776 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_128
;
779 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "56bit", true)) {
780 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_56
;
783 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "keyexchange", true)) {
784 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_KEY_EXCH
;
787 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "alwayssign", true)) {
788 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_ALWAYS_SIGN
;
791 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_server", "ntlm2", true)) {
792 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_NTLM2
;
795 if (gensec_security
->want_features
& GENSEC_FEATURE_SIGN
) {
796 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_SIGN
;
798 if (gensec_security
->want_features
& GENSEC_FEATURE_SEAL
) {
799 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_SEAL
;
802 gensec_ntlmssp_state
->auth_context
= gensec_security
->auth_context
;
804 gensec_ntlmssp_state
->get_challenge
= auth_ntlmssp_get_challenge
;
805 gensec_ntlmssp_state
->may_set_challenge
= auth_ntlmssp_may_set_challenge
;
806 gensec_ntlmssp_state
->set_challenge
= auth_ntlmssp_set_challenge
;
807 gensec_ntlmssp_state
->check_password
= auth_ntlmssp_check_password
;
808 gensec_ntlmssp_state
->server_role
= lp_server_role(gensec_security
->settings
->lp_ctx
);