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 lp_iconv_convenience(gensec_security->lp_ctx),
209 &struct_blob, "aaaaa",
210 NTLMSSP_NAME_TYPE_DOMAIN, target_name,
211 NTLMSSP_NAME_TYPE_SERVER, gensec_ntlmssp_state->server_name,
212 NTLMSSP_NAME_TYPE_DOMAIN_DNS, dnsdomname,
213 NTLMSSP_NAME_TYPE_SERVER_DNS, dnsname,
216 struct_blob = data_blob(NULL, 0);
220 /* Marshal the packet in the right format, be it unicode or ASCII */
221 const char *gen_string;
222 if (gensec_ntlmssp_state->unicode) {
223 gen_string = "CdUdbddB";
225 gen_string = "CdAdbddB";
228 msrpc_gen(out_mem_ctx,
229 lp_iconv_convenience(gensec_security->lp_ctx),
237 struct_blob.data, struct_blob.length);
240 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
242 return NT_STATUS_MORE_PROCESSING_REQUIRED;
246 * Next state function for the Authenticate packet
248 * @param gensec_ntlmssp_state NTLMSSP State
249 * @param request The request, as a DATA_BLOB
250 * @return Errors or NT_STATUS_OK.
253 static NTSTATUS ntlmssp_server_preauth(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
254 const DATA_BLOB request)
256 uint32_t ntlmssp_command, auth_flags;
259 uint8_t session_nonce_hash[16];
261 const char *parse_string;
264 char *workstation = NULL;
267 file_save("ntlmssp_auth.dat", request.data, request.length);
270 if (gensec_ntlmssp_state->unicode) {
271 parse_string = "CdBBUUUBd";
273 parse_string = "CdBBAAABd";
277 data_blob_free(&gensec_ntlmssp_state->lm_resp);
278 data_blob_free(&gensec_ntlmssp_state->nt_resp);
279 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
281 gensec_ntlmssp_state->user = NULL;
282 gensec_ntlmssp_state->domain = NULL;
283 gensec_ntlmssp_state->workstation = NULL;
285 /* now the NTLMSSP encoded auth hashes */
286 if (!msrpc_parse(gensec_ntlmssp_state,
287 lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx),
288 &request, parse_string,
291 &gensec_ntlmssp_state->lm_resp,
292 &gensec_ntlmssp_state->nt_resp,
296 &gensec_ntlmssp_state->encrypted_session_key,
298 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
299 dump_data(10, request.data, request.length);
302 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
305 /* Try again with a shorter string (Win9X truncates this packet) */
306 if (gensec_ntlmssp_state->unicode) {
307 parse_string = "CdBBUUU";
309 parse_string = "CdBBAAA";
312 /* now the NTLMSSP encoded auth hashes */
313 if (!msrpc_parse(gensec_ntlmssp_state,
314 lp_iconv_convenience(gensec_ntlmssp_state->gensec_security->lp_ctx),
315 &request, parse_string,
318 &gensec_ntlmssp_state->lm_resp,
319 &gensec_ntlmssp_state->nt_resp,
323 DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
324 dump_data(2, request.data, request.length);
326 return NT_STATUS_INVALID_PARAMETER;
331 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, auth_flags, gensec_ntlmssp_state->allow_lm_key);
333 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(gensec_ntlmssp_state, domain))) {
335 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
339 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(gensec_ntlmssp_state, user))) {
341 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
345 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state, workstation))) {
347 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
351 DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
352 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));
355 file_save("nthash1.dat", &gensec_ntlmssp_state->nt_resp.data, &gensec_ntlmssp_state->nt_resp.length);
356 file_save("lmhash1.dat", &gensec_ntlmssp_state->lm_resp.data, &gensec_ntlmssp_state->lm_resp.length);
359 /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
362 However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
364 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
365 if (gensec_ntlmssp_state->nt_resp.length == 24 && gensec_ntlmssp_state->lm_resp.length == 24) {
366 struct MD5Context md5_session_nonce_ctx;
367 SMB_ASSERT(gensec_ntlmssp_state->internal_chal.data
368 && gensec_ntlmssp_state->internal_chal.length == 8);
370 gensec_ntlmssp_state->doing_ntlm2 = true;
372 memcpy(gensec_ntlmssp_state->crypt.ntlm2.session_nonce, gensec_ntlmssp_state->internal_chal.data, 8);
373 memcpy(&gensec_ntlmssp_state->crypt.ntlm2.session_nonce[8], gensec_ntlmssp_state->lm_resp.data, 8);
375 MD5Init(&md5_session_nonce_ctx);
376 MD5Update(&md5_session_nonce_ctx, gensec_ntlmssp_state->crypt.ntlm2.session_nonce, 16);
377 MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
379 gensec_ntlmssp_state->chal = data_blob_talloc(gensec_ntlmssp_state,
380 session_nonce_hash, 8);
382 /* LM response is no longer useful, zero it out */
383 data_blob_free(&gensec_ntlmssp_state->lm_resp);
385 /* We changed the effective challenge - set it */
386 if (!NT_STATUS_IS_OK(nt_status =
387 gensec_ntlmssp_state->set_challenge(gensec_ntlmssp_state,
388 &gensec_ntlmssp_state->chal))) {
390 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
394 /* LM Key is incompatible... */
395 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
402 * Next state function for the Authenticate packet
403 * (after authentication - figures out the session keys etc)
405 * @param gensec_ntlmssp_state NTLMSSP State
406 * @return Errors or NT_STATUS_OK.
409 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
410 DATA_BLOB *user_session_key,
411 DATA_BLOB *lm_session_key)
413 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
415 DATA_BLOB session_key = data_blob(NULL, 0);
417 if (user_session_key)
418 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
421 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
423 /* Handle the different session key derivation for NTLM2 */
424 if (gensec_ntlmssp_state->doing_ntlm2) {
425 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
426 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
427 hmac_md5(user_session_key->data, gensec_ntlmssp_state->crypt.ntlm2.session_nonce,
428 sizeof(gensec_ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
429 DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
430 dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
433 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
434 session_key = data_blob(NULL, 0);
436 } else if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
437 /* Ensure we can never get here on NTLMv2 */
438 && (gensec_ntlmssp_state->nt_resp.length == 0 || gensec_ntlmssp_state->nt_resp.length == 24)) {
440 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
441 if (gensec_ntlmssp_state->lm_resp.data && gensec_ntlmssp_state->lm_resp.length == 24) {
442 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
443 SMBsesskeygen_lm_sess_key(lm_session_key->data, gensec_ntlmssp_state->lm_resp.data,
445 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
446 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
449 /* When there is no LM response, just use zeros */
450 static const uint8_t zeros[24];
451 session_key = data_blob_talloc(gensec_ntlmssp_state, NULL, 16);
452 SMBsesskeygen_lm_sess_key(zeros, zeros,
454 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
455 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
458 /* LM Key not selected */
459 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
461 DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
462 session_key = data_blob(NULL, 0);
465 } else if (user_session_key && user_session_key->data) {
466 session_key = *user_session_key;
467 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
468 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
470 /* LM Key not selected */
471 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
473 } else if (lm_session_key && lm_session_key->data) {
474 /* Very weird to have LM key, but no user session key, but anyway.. */
475 session_key = *lm_session_key;
476 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
477 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
479 /* LM Key not selected */
480 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
483 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
484 session_key = data_blob(NULL, 0);
486 /* LM Key not selected */
487 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
490 /* With KEY_EXCH, the client supplies the proposed session key,
491 but encrypts it with the long-term key */
492 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
493 if (!gensec_ntlmssp_state->encrypted_session_key.data
494 || gensec_ntlmssp_state->encrypted_session_key.length != 16) {
495 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
496 DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
497 (unsigned)gensec_ntlmssp_state->encrypted_session_key.length));
498 return NT_STATUS_INVALID_PARAMETER;
499 } else if (!session_key.data || session_key.length != 16) {
500 DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
501 (unsigned)session_key.length));
502 gensec_ntlmssp_state->session_key = session_key;
504 dump_data_pw("KEY_EXCH session key (enc):\n",
505 gensec_ntlmssp_state->encrypted_session_key.data,
506 gensec_ntlmssp_state->encrypted_session_key.length);
507 arcfour_crypt(gensec_ntlmssp_state->encrypted_session_key.data,
509 gensec_ntlmssp_state->encrypted_session_key.length);
510 gensec_ntlmssp_state->session_key = data_blob_talloc(gensec_ntlmssp_state,
511 gensec_ntlmssp_state->encrypted_session_key.data,
512 gensec_ntlmssp_state->encrypted_session_key.length);
513 dump_data_pw("KEY_EXCH session key:\n", gensec_ntlmssp_state->encrypted_session_key.data,
514 gensec_ntlmssp_state->encrypted_session_key.length);
517 gensec_ntlmssp_state->session_key = session_key;
520 /* keep the session key around on the new context */
521 talloc_steal(gensec_ntlmssp_state, session_key.data);
523 if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
524 || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
525 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
527 nt_status = NT_STATUS_OK;
530 data_blob_free(&gensec_ntlmssp_state->encrypted_session_key);
532 /* allow arbitarily many authentications, but watch that this will cause a
533 memory leak, until the gensec_ntlmssp_state is shutdown
536 if (gensec_ntlmssp_state->server_multiple_authentications) {
537 gensec_ntlmssp_state->expected_state = NTLMSSP_AUTH;
539 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
547 * Next state function for the Authenticate packet
549 * @param gensec_security GENSEC state
550 * @param out_mem_ctx Memory context for *out
551 * @param in The request, as a DATA_BLOB. reply.data must be NULL
552 * @param out The reply, as an allocated DATA_BLOB, caller to free.
553 * @return Errors or NT_STATUS_OK if authentication sucessful
556 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
557 TALLOC_CTX *out_mem_ctx,
558 const DATA_BLOB in, DATA_BLOB *out)
560 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
561 DATA_BLOB user_session_key = data_blob(NULL, 0);
562 DATA_BLOB lm_session_key = data_blob(NULL, 0);
565 TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
567 return NT_STATUS_NO_MEMORY;
570 /* zero the outbound NTLMSSP packet */
571 *out = data_blob_talloc(out_mem_ctx, NULL, 0);
573 if (!NT_STATUS_IS_OK(nt_status = ntlmssp_server_preauth(gensec_ntlmssp_state, in))) {
574 talloc_free(mem_ctx);
579 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
580 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
581 * smb.conf file) and no NTLMv2 response was sent then the password check
582 * will fail here. JRA.
585 /* Finally, actually ask if the password is OK */
587 if (!NT_STATUS_IS_OK(nt_status = gensec_ntlmssp_state->check_password(gensec_ntlmssp_state, mem_ctx,
588 &user_session_key, &lm_session_key))) {
589 talloc_free(mem_ctx);
593 if (gensec_security->want_features
594 & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY)) {
595 nt_status = ntlmssp_server_postauth(gensec_security, &user_session_key, &lm_session_key);
596 talloc_free(mem_ctx);
599 gensec_ntlmssp_state->session_key = data_blob(NULL, 0);
600 talloc_free(mem_ctx);
606 * Return the challenge as determined by the authentication subsystem
607 * @return an 8 byte random challenge
610 static const uint8_t *auth_ntlmssp_get_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
615 status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
616 if (!NT_STATUS_IS_OK(status)) {
617 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
626 * Some authentication methods 'fix' the challenge, so we may not be able to set it
628 * @return If the effective challenge used by the auth subsystem may be modified
630 static bool auth_ntlmssp_may_set_challenge(const struct gensec_ntlmssp_state *gensec_ntlmssp_state)
632 return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
636 * NTLM2 authentication modifies the effective challenge,
637 * @param challenge The new challenge value
639 static NTSTATUS auth_ntlmssp_set_challenge(struct gensec_ntlmssp_state *gensec_ntlmssp_state, DATA_BLOB *challenge)
642 struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
645 if (challenge->length != 8) {
646 return NT_STATUS_INVALID_PARAMETER;
649 chal = challenge->data;
651 nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
657 * Check the password on an NTLMSSP login.
659 * Return the session keys used on the connection.
662 static NTSTATUS auth_ntlmssp_check_password(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
664 DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
667 struct auth_usersupplied_info *user_info = talloc(mem_ctx, struct auth_usersupplied_info);
669 return NT_STATUS_NO_MEMORY;
672 user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
673 user_info->flags = 0;
674 user_info->mapped_state = false;
675 user_info->client.account_name = gensec_ntlmssp_state->user;
676 user_info->client.domain_name = gensec_ntlmssp_state->domain;
677 user_info->workstation_name = gensec_ntlmssp_state->workstation;
678 user_info->remote_host = gensec_get_peer_addr(gensec_ntlmssp_state->gensec_security);
680 user_info->password_state = AUTH_PASSWORD_RESPONSE;
681 user_info->password.response.lanman = gensec_ntlmssp_state->lm_resp;
682 user_info->password.response.lanman.data = talloc_steal(user_info, gensec_ntlmssp_state->lm_resp.data);
683 user_info->password.response.nt = gensec_ntlmssp_state->nt_resp;
684 user_info->password.response.nt.data = talloc_steal(user_info, gensec_ntlmssp_state->nt_resp.data);
686 nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, mem_ctx,
687 user_info, &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->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->lp_ctx);
759 gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->lp_ctx);
761 gensec_ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
763 gensec_ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->lp_ctx)
764 && lp_parm_bool(gensec_security->lp_ctx, NULL, "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 (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "128bit", true)) {
776 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
779 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "56bit", true)) {
780 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
783 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "keyexchange", true)) {
784 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
787 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_server", "alwayssign", true)) {
788 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
791 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "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 nt_status = auth_context_create(gensec_ntlmssp_state,
803 gensec_security->event_ctx,
804 gensec_security->msg_ctx,
805 gensec_security->lp_ctx,
806 &gensec_ntlmssp_state->auth_context);
807 NT_STATUS_NOT_OK_RETURN(nt_status);
809 gensec_ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
810 gensec_ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
811 gensec_ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
812 gensec_ntlmssp_state->check_password = auth_ntlmssp_check_password;
813 gensec_ntlmssp_state->server_role = lp_server_role(gensec_security->lp_ctx);