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 "auth/ntlmssp/ntlmssp.h"
26 #include "auth/ntlmssp/msrpc_parse.h"
27 #include "../lib/crypto/crypto.h"
28 #include "libcli/auth/libcli_auth.h"
29 #include "auth/credentials/credentials.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_CHAL_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,
139 lp_iconv_convenience(gensec_security->lp_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->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 lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx),
286 &request, parse_string,
289 &gensec_ntlmssp_state->lm_resp,
290 &gensec_ntlmssp_state->nt_resp,
294 &gensec_ntlmssp_state->encrypted_session_key,
296 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
297 dump_data(10, request.data, request.length);
300 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
303 /* Try again with a shorter string (Win9X truncates this packet) */
304 if (gensec_ntlmssp_state->unicode) {
305 parse_string = "CdBBUUU";
307 parse_string = "CdBBAAA";
310 /* now the NTLMSSP encoded auth hashes */
311 if (!msrpc_parse(gensec_ntlmssp_state,
312 lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx),
313 &request, parse_string,
316 &gensec_ntlmssp_state->lm_resp,
317 &gensec_ntlmssp_state->nt_resp,
321 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
322 dump_data(2, request.data, request.length);
324 return NT_STATUS_INVALID_PARAMETER;
329 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
331 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
333 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
337 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
339 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
343 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
345 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
349 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
350 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));
353 file_save("nthash1.dat", &gensec_ntlmssp_state->nt_resp.data, &gensec_ntlmssp_state->nt_resp.length);
354 file_save("lmhash1.dat", &gensec_ntlmssp_state->lm_resp.data, &gensec_ntlmssp_state->lm_resp.length);
357 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
360 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
362 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
363 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
364 struct MD5Context md5_session_nonce_ctx;
365 SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
366 && gensec_ntlmssp_state->internal_chal.length == 8);
368 gensec_ntlmssp_state->doing_ntlm2 = true;
370 memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
371 memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
373 MD5Init(&md5_session_nonce_ctx);
374 MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
375 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
377 gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
378 session_nonce_hash, 8);
380 /* LM response is no longer useful, zero it out */
381 data_blob_free(&gensec_ntlmssp_state->lm_resp);
383 /* We changed the effective challenge - set it */
384 if (!NT_STATUS_IS_OK(nt_status =
385 gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
386 &gensec_ntlmssp_state->chal))) {
388 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
392 /* LM Key is incompatible... */
393 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
400 * Next state function for the Authenticate packet
401 * (after authentication - figures out the session keys etc)
403 * @param gensec_ntlmssp_state NTLMSSP State
404 * @return Errors or NT_STATUS_OK.
407 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
408 DATA_BLOB *user_session_key,
409 DATA_BLOB *lm_session_key)
411 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
413 DATA_BLOB session_key = data_blob(NULL, 0);
415 if (user_session_key)
416 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
419 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
421 /* Handle the different session key derivation for NTLM2 */
422 if (gensec_ntlmssp_state->doing_ntlm2) {
423 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
424 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
425 hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
426 sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
427 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
428 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
431 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
432 session_key = data_blob(NULL, 0);
434 } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
435 /* Ensure we can never get here on NTLMv2 */
436 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
438 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
439 if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
440 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
441 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
443 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
444 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
447 /* When there is no LM response, just use zeros */
448 static const uint8_t zeros[24];
449 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
450 SMBsesskeygen_lm_sess_key(zeros, zeros,
452 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
453 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
456 /* LM Key not selected */
457 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
459 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
460 session_key = data_blob(NULL, 0);
463 } else if (user_session_key && user_session_key->data) {
464 session_key = *user_session_key;
465 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
466 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
468 /* LM Key not selected */
469 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
471 } else if (lm_session_key && lm_session_key->data) {
472 /* Very weird to have LM key, but no user session key, but anyway.. */
473 session_key = *lm_session_key;
474 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
475 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
477 /* LM Key not selected */
478 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
481 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
482 session_key = data_blob(NULL, 0);
484 /* LM Key not selected */
485 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
488 /* With KEY_EXCH, the client supplies the proposed session key,
489 but encrypts it with the long-term key */
490 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
491 if (!gensec_ntlmssp_state->encrypted_session_key.data
492 || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
493 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
494 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
495 (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
496 return NT_STATUS_INVALID_PARAMETER;
497 } else if (!session_key.data || session_key.length != 16) {
498 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
499 (unsigned)session_key.length));
500 gensec_ntlmssp_state->session_key = session_key;
502 dump_data_pw("KEY_EXCH session key (enc):\n",
503 gensec_ntlmssp_state->encrypted_session_key.data,
504 gensec_ntlmssp_state->encrypted_session_key.length);
505 arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
507 gensec_ntlmssp_state->encrypted_session_key.length);
508 gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
509 gensec_ntlmssp_state->encrypted_session_key.data,
510 gensec_ntlmssp_state->encrypted_session_key.length);
511 dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
512 gensec_ntlmssp_state->encrypted_session_key.length);
515 gensec_ntlmssp_state->session_key = session_key;
518 /* keep the session key around on the new context */
519 talloc_steal(gensec_ntlmssp_state, session_key.data);
521 if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
522 || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
523 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
525 nt_status = NT_STATUS_OK;
528 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
530 /* allow arbitarily many authentications, but watch that this will cause a
531 memory leak, until the gensec_ntlmssp_state is shutdown
534 if (gensec_ntlmssp_state->server_multiple_authentications) {
535 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
537 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
545 * Next state function for the Authenticate packet
547 * @param gensec_security GENSEC state
548 * @param out_mem_ctx Memory context for *out
549 * @param in The request, as a DATA_BLOB. reply.data must be NULL
550 * @param out The reply, as an allocated DATA_BLOB, caller to free.
551 * @return Errors or NT_STATUS_OK if authentication sucessful
554 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
555 TALLOC_CTX *out_mem_ctx,
556 const DATA_BLOB in, DATA_BLOB *out)
558 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
559 DATA_BLOB user_session_key = data_blob(NULL, 0);
560 DATA_BLOB lm_session_key = data_blob(NULL, 0);
563 TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
565 return NT_STATUS_NO_MEMORY;
568 /* zero the outbound NTLMSSP packet */
569 *out = data_blob_talloc(out_mem_ctx, NULL, 0);
571 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
572 talloc_free(mem_ctx);
577 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
578 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
579 * smb.conf file) and no NTLMv2 response was sent then the password check
580 * will fail here. JRA.
583 /* Finally, actually ask if the password is OK */
585 if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,
586 &user_session_key, &lm_session_key))) {
587 talloc_free(mem_ctx);
591 if (gensec_security->want_features
592 & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
593 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
594 talloc_free(mem_ctx);
597 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
598 talloc_free(mem_ctx);
604 * Return the challenge as determined by the authentication subsystem
605 * @return an 8 byte random challenge
608 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
613 status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
614 if (!NT_STATUS_IS_OK(status)) {
615 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
624 * Some authentication methods 'fix' the challenge, so we may not be able to set it
626 * @return If the effective challenge used by the auth subsystem may be modified
628 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
630 return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
634 * NTLM2 authentication modifies the effective challenge,
635 * @param challenge The new challenge value
637 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
640 struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
643 if (challenge->length != 8) {
644 return NT_STATUS_INVALID_PARAMETER;
647 chal = challenge->data;
649 nt_status = auth_context_set_challenge(auth_context, chal, "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 = auth_check_password(gensec_ntlmssp_state->auth_context, mem_ctx,
685 user_info, &gensec_ntlmssp_state->server_info);
686 talloc_free(user_info);
687 NT_STATUS_NOT_OK_RETURN(nt_status);
689 talloc_steal(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info);
691 if (gensec_ntlmssp_state->server_info->user_session_key.length) {
692 DEBUG(10, ("Got NT session key of length %u\n",
693 (unsigned)gensec_ntlmssp_state->server_info->user_session_key.length));
694 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->user_session_key.data)) {
695 return NT_STATUS_NO_MEMORY;
698 *user_session_key = gensec_ntlmssp_state->server_info->user_session_key;
700 if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
701 DEBUG(10, ("Got LM session key of length %u\n",
702 (unsigned)gensec_ntlmssp_state->server_info->lm_session_key.length));
703 if (!talloc_reference(mem_ctx, gensec_ntlmssp_state->server_info->lm_session_key.data)) {
704 return NT_STATUS_NO_MEMORY;
707 *lm_session_key = gensec_ntlmssp_state->server_info->lm_session_key;
713 * Return the credentials of a logged on user, including session keys
716 * Only valid after a successful authentication
718 * May only be called once per authentication.
722 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
723 struct auth_session_info **session_info)
726 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
728 nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_security->event_ctx, gensec_security->lp_ctx, gensec_ntlmssp_state->server_info, session_info);
729 NT_STATUS_NOT_OK_RETURN(nt_status);
731 (*session_info)->session_key = data_blob_talloc(*session_info,
732 gensec_ntlmssp_state->session_key.data,
733 gensec_ntlmssp_state->session_key.length);
739 * Start NTLMSSP on the server side
742 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
745 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
747 nt_status = gensec_ntlmssp_start(gensec_security);
748 NT_STATUS_NOT_OK_RETURN(nt_status);
750 gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
752 gensec_ntlmssp_state->role = NTLMSSP_SERVER;
754 gensec_ntlmssp_state->workstation = NULL;
755 gensec_ntlmssp_state->server_name = lp_netbios_name(gensec_security->lp_ctx);
757 gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->lp_ctx);
759 gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
761 gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->lp_ctx)
762 && lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "allow_lm_key", false));
764 gensec_ntlmssp_state->server_multiple_authentications = false;
766 gensec_ntlmssp_state->neg_flags =
767 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_UNKNOWN_02000000;
769 gensec_ntlmssp_state->lm_resp = data_blob(NULL, 0);
770 gensec_ntlmssp_state->nt_resp = data_blob(NULL, 0);
771 gensec_ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
773 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "128bit", true)) {
774 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
777 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "56bit", true)) {
778 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
781 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "keyexchange", true)) {
782 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
785 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "alwayssign", true)) {
786 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
789 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "ntlm2", true)) {
790 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
793 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
794 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
796 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
797 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
800 nt_status = auth_context_create(gensec_ntlmssp_state,
801 gensec_security->event_ctx,
802 gensec_security->msg_ctx,
803 gensec_security->lp_ctx,
804 &gensec_ntlmssp_state->auth_context);
805 NT_STATUS_NOT_OK_RETURN(nt_status);
807 gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
808 gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
809 gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
810 gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
811 gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->lp_ctx);