source: branches/samba-3.5.x/source4/auth/ntlmssp/ntlmssp_server.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 27.6 KB
Line 
1/*
2 Unix SMB/Netbios implementation.
3 Version 3.0
4 handle NLTMSSP, client server side parsing
5
6 Copyright (C) Andrew Tridgell 2001
7 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
8 Copyright (C) Stefan Metzmacher 2005
9
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.
14
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.
19
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/>.
22*/
23
24#include "includes.h"
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"
35
36/**
37 * Set a username on an NTLMSSP context - ensures it is talloc()ed
38 *
39 */
40
41static NTSTATUS ntlmssp_set_username(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *user)
42{
43 if (!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;
47 }
48 gensec_ntlmssp_state->user = talloc_strdup(gensec_ntlmssp_state, user);
49 if (!gensec_ntlmssp_state->user) {
50 return NT_STATUS_NO_MEMORY;
51 }
52 return NT_STATUS_OK;
53}
54
55/**
56 * Set a domain on an NTLMSSP context - ensures it is talloc()ed
57 *
58 */
59static NTSTATUS ntlmssp_set_domain(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *domain)
60{
61 gensec_ntlmssp_state->domain = talloc_strdup(gensec_ntlmssp_state, domain);
62 if (!gensec_ntlmssp_state->domain) {
63 return NT_STATUS_NO_MEMORY;
64 }
65 return NT_STATUS_OK;
66}
67
68/**
69 * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
70 *
71 */
72static NTSTATUS ntlmssp_set_workstation(struct gensec_ntlmssp_state *gensec_ntlmssp_state, const char *workstation)
73{
74 gensec_ntlmssp_state->workstation = talloc_strdup(gensec_ntlmssp_state, workstation);
75 if (!gensec_ntlmssp_state->workstation) {
76 return NT_STATUS_NO_MEMORY;
77 }
78 return NT_STATUS_OK;
79}
80
81/**
82 * Determine correct target name flags for reply, given server role
83 * and negotiated flags
84 *
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.
89 */
90
91static const char *ntlmssp_target_name(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
92 uint32_t neg_flags, uint32_t *chal_flags)
93{
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;
100 } else {
101 *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
102 return gensec_ntlmssp_state->domain;
103 };
104 } else {
105 return "";
106 }
107}
108
109
110
111/**
112 * Next state function for the Negotiate packet
113 *
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.
119 */
120
121NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
122 TALLOC_CTX *out_mem_ctx,
123 const DATA_BLOB in, DATA_BLOB *out)
124{
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;
131
132 /* parse the NTLMSSP packet */
133#if 0
134 file_save("ntlmssp_negotiate.dat", request.data, request.length);
135#endif
136
137 if (in.length) {
138 if ((in.length < 16) || !msrpc_parse(out_mem_ctx,
139 &in, "Cdd",
140 "NTLMSSP",
141 &ntlmssp_command,
142 &neg_flags)) {
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;
148 }
149 debug_ntlmssp_flags(neg_flags);
150 }
151
152 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, neg_flags, gensec_ntlmssp_state->allow_lm_key);
153
154 /* Ask our caller what challenge they would like in the packet */
155 cryptkey = gensec_ntlmssp_state->get_challenge(gensec_ntlmssp_state);
156 if (!cryptkey) {
157 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
158 return NT_STATUS_INTERNAL_ERROR;
159 }
160
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;
164 }
165
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
169 */
170
171 chal_flags = gensec_ntlmssp_state->neg_flags;
172
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;
178
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);
181
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 = "";
186
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);
191
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);
197 }
198 strlower_m(dnsname);
199
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;
204 }
205
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,
212 MsvAvEOL, "");
213 } else {
214 struct_blob = data_blob(NULL, 0);
215 }
216
217 {
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";
222 } else {
223 gen_string = "CdAdbddB";
224 }
225
226 msrpc_gen(out_mem_ctx,
227 out, gen_string,
228 "NTLMSSP",
229 NTLMSSP_CHALLENGE,
230 target_name,
231 chal_flags,
232 cryptkey, 8,
233 0, 0,
234 struct_blob.data, struct_blob.length);
235 }
236
237 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
238
239 return NT_STATUS_MORE_PROCESSING_REQUIRED;
240}
241
242/**
243 * Next state function for the Authenticate packet
244 *
245 * @param gensec_ntlmssp_state NTLMSSP State
246 * @param request The request, as a DATA_BLOB
247 * @return Errors or NT_STATUS_OK.
248 */
249
250static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
251 const DATA_BLOB request)
252{
253 uint32_t ntlmssp_command, auth_flags;
254 NTSTATUS nt_status;
255
256 uint8_t session_nonce_hash[16];
257
258 const char *parse_string;
259 char *domain = NULL;
260 char *user = NULL;
261 char *workstation = NULL;
262
263#if 0
264 file_save("ntlmssp_auth.dat", request.data, request.length);
265#endif
266
267 if (gensec_ntlmssp_state->unicode) {
268 parse_string = "CdBBUUUBd";
269 } else {
270 parse_string = "CdBBAAABd";
271 }
272
273 /* zero these out */
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);
277
278 gensec_ntlmssp_state->user = NULL;
279 gensec_ntlmssp_state->domain = NULL;
280 gensec_ntlmssp_state->workstation = NULL;
281
282 /* now the NTLMSSP encoded auth hashes */
283 if (!msrpc_parse(gensec_ntlmssp_state,
284 &request, parse_string,
285 "NTLMSSP",
286 &ntlmssp_command,
287 &gensec_ntlmssp_state->lm_resp,
288 &gensec_ntlmssp_state->nt_resp,
289 &domain,
290 &user,
291 &workstation,
292 &gensec_ntlmssp_state->encrypted_session_key,
293 &auth_flags)) {
294 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
295 dump_data(10, request.data, request.length);
296
297 /* zero this out */
298 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
299 auth_flags = 0;
300
301 /* Try again with a shorter string (Win9X truncates this packet) */
302 if (gensec_ntlmssp_state->unicode) {
303 parse_string = "CdBBUUU";
304 } else {
305 parse_string = "CdBBAAA";
306 }
307
308 /* now the NTLMSSP encoded auth hashes */
309 if (!msrpc_parse(gensec_ntlmssp_state,
310 &request, parse_string,
311 "NTLMSSP",
312 &ntlmssp_command,
313 &gensec_ntlmssp_state->lm_resp,
314 &gensec_ntlmssp_state->nt_resp,
315 &domain,
316 &user,
317 &workstation)) {
318 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
319 dump_data(2, request.data, request.length);
320
321 return NT_STATUS_INVALID_PARAMETER;
322 }
323 }
324
325 if (auth_flags)
326 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
327
328 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
329 /* zero this out */
330 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
331 return nt_status;
332 }
333
334 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
335 /* zero this out */
336 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
337 return nt_status;
338 }
339
340 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
341 /* zero this out */
342 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
343 return nt_status;
344 }
345
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));
348
349#if 0
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);
352#endif
353
354 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
355 client challenge
356
357 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
358 */
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);
364
365 gensec_ntlmssp_state->doing_ntlm2 = true;
366
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);
369
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);
373
374 gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
375 session_nonce_hash, 8);
376
377 /* LM response is no longer useful, zero it out */
378 data_blob_free(&gensec_ntlmssp_state->lm_resp);
379
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))) {
384 /* zero this out */
385 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
386 return nt_status;
387 }
388
389 /* LM Key is incompatible... */
390 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
391 }
392 }
393 return NT_STATUS_OK;
394}
395
396/**
397 * Next state function for the Authenticate packet
398 * (after authentication - figures out the session keys etc)
399 *
400 * @param gensec_ntlmssp_state NTLMSSP State
401 * @return Errors or NT_STATUS_OK.
402 */
403
404static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
405 DATA_BLOB *user_session_key,
406 DATA_BLOB *lm_session_key)
407{
408 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
409 NTSTATUS nt_status;
410 DATA_BLOB session_key = data_blob(NULL, 0);
411
412 if (user_session_key)
413 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
414
415 if (lm_session_key)
416 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
417
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);
426
427 } else {
428 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
429 session_key = data_blob(NULL, 0);
430 }
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)) {
434
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,
439 session_key.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);
442 } else {
443
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,
448 session_key.data);
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);
451 }
452 } else {
453 /* LM Key not selected */
454 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
455
456 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
457 session_key = data_blob(NULL, 0);
458 }
459
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);
464
465 /* LM Key not selected */
466 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
467
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);
473
474 /* LM Key not selected */
475 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
476
477 } else {
478 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
479 session_key = data_blob(NULL, 0);
480
481 /* LM Key not selected */
482 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
483 }
484
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;
498 } else {
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,
503 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);
511 }
512 } else {
513 gensec_ntlmssp_state->session_key = session_key;
514 }
515
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);
519 } else {
520 nt_status = NT_STATUS_OK;
521 }
522
523 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
524
525 /* allow arbitarily many authentications, but watch that this will cause a
526 memory leak, until the gensec_ntlmssp_state is shutdown
527 */
528
529 if (gensec_ntlmssp_state->server_multiple_authentications) {
530 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
531 } else {
532 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
533 }
534
535 return nt_status;
536}
537
538
539/**
540 * Next state function for the Authenticate packet
541 *
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
547 */
548
549NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
550 TALLOC_CTX *out_mem_ctx,
551 const DATA_BLOB in, DATA_BLOB *out)
552{
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);
556 NTSTATUS nt_status;
557
558 TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
559 if (!mem_ctx) {
560 return NT_STATUS_NO_MEMORY;
561 }
562
563 /* zero the outbound NTLMSSP packet */
564 *out = data_blob_talloc(out_mem_ctx, NULL, 0);
565
566 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
567 talloc_free(mem_ctx);
568 return nt_status;
569 }
570
571 /*
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.
576 */
577
578 /* Finally, actually ask if the password is OK */
579
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);
583 return nt_status;
584 }
585
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);
590 return nt_status;
591 } else {
592 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
593 talloc_free(mem_ctx);
594 return NT_STATUS_OK;
595 }
596}
597
598/**
599 * Return the challenge as determined by the authentication subsystem
600 * @return an 8 byte random challenge
601 */
602
603static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
604{
605 NTSTATUS status;
606 const uint8_t *chal;
607
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",
611 nt_errstr(status)));
612 return NULL;
613 }
614
615 return chal;
616}
617
618/**
619 * Some authentication methods 'fix' the challenge, so we may not be able to set it
620 *
621 * @return If the effective challenge used by the auth subsystem may be modified
622 */
623static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
624{
625 return gensec_ntlmssp_state->auth_context->challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
626}
627
628/**
629 * NTLM2 authentication modifies the effective challenge,
630 * @param challenge The new challenge value
631 */
632static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
633{
634 NTSTATUS nt_status;
635 struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
636 const uint8_t *chal;
637
638 if (challenge->length != 8) {
639 return NT_STATUS_INVALID_PARAMETER;
640 }
641
642 chal = challenge->data;
643
644 nt_status = gensec_ntlmssp_state->auth_context->set_challenge(auth_context,
645 chal,
646 "NTLMSSP callback (NTLM2)");
647
648 return nt_status;
649}
650
651/**
652 * Check the password on an NTLMSSP login.
653 *
654 * Return the session keys used on the connection.
655 */
656
657static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
658 TALLOC_CTX *mem_ctx,
659 DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
660{
661 NTSTATUS nt_status;
662 struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);
663 if (!user_info) {
664 return NT_STATUS_NO_MEMORY;
665 }
666
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);
674
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);
680
681 nt_status = gensec_ntlmssp_state->auth_context->check_password(gensec_ntlmssp_state->auth_context,
682 mem_ctx,
683 user_info,
684 &gensec_ntlmssp_state->server_info);
685 talloc_free(user_info);
686 NT_STATUS_NOT_OK_RETURN(nt_status);
687
688 talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);
689
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;
695 }
696
697 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
698 }
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;
704 }
705
706 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
707 }
708 return nt_status;
709}
710
711/**
712 * Return the credentials of a logged on user, including session keys
713 * etc.
714 *
715 * Only valid after a successful authentication
716 *
717 * May only be called once per authentication.
718 *
719 */
720
721NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
722 struct auth_session_info **session_info)
723{
724 NTSTATUS nt_status;
725 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
726
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);
729
730 (*session_info)->session_key = data_blob_talloc(*session_info,
731 gensec_ntlmssp_state->session_key.data,
732 gensec_ntlmssp_state->session_key.length);
733
734 return NT_STATUS_OK;
735}
736
737/**
738 * Start NTLMSSP on the server side
739 *
740 */
741NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
742{
743 NTSTATUS nt_status;
744 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
745
746 nt_status = gensec_ntlmssp_start(gensec_security);
747 NT_STATUS_NOT_OK_RETURN(nt_status);
748
749 gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
750
751 gensec_ntlmssp_state->role = NTLMSSP_SERVER;
752
753 gensec_ntlmssp_state->workstation = NULL;
754 gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->settings->lp_ctx);
755
756 gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->settings->lp_ctx);
757
758 gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
759
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));
762
763 gensec_ntlmssp_state->server_multiple_authentications = false;
764
765 gensec_ntlmssp_state->neg_flags =
766 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
767
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);
771
772 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
773 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
774 }
775
776 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
777 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
778 }
779
780 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
781 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
782 }
783
784 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
785 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
786 }
787
788 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
789 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
790 }
791
792 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
793 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
794 }
795 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
796 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
797 }
798
799 gensec_ntlmssp_state->auth_context = gensec_security->auth_context;
800
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);
806
807 return NT_STATUS_OK;
808}
809
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