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/>.
24 struct auth_session_info
;
27 #include "auth/ntlmssp/ntlmssp.h"
28 #include "source4/auth/ntlmssp/proto.h"
29 #include "../lib/crypto/crypto.h"
30 #include "../libcli/auth/libcli_auth.h"
31 #include "auth/credentials/credentials.h"
32 #include "auth/gensec/gensec.h"
33 #include "param/param.h"
34 #include "auth/ntlmssp/ntlmssp_private.h"
36 /*********************************************************************
38 *********************************************************************/
41 * Next state function for the Initial packet
43 * @param ntlmssp_state NTLMSSP State
44 * @param out_mem_ctx The DATA_BLOB *out will be allocated on this context
45 * @param in A NULL data blob (input ignored)
46 * @param out The initial negotiate request to the server, as an talloc()ed DATA_BLOB, on out_mem_ctx
47 * @return Errors or NT_STATUS_OK.
50 NTSTATUS
ntlmssp_client_initial(struct gensec_security
*gensec_security
,
51 TALLOC_CTX
*out_mem_ctx
,
52 DATA_BLOB in
, DATA_BLOB
*out
)
54 struct gensec_ntlmssp_context
*gensec_ntlmssp
=
55 talloc_get_type_abort(gensec_security
->private_data
,
56 struct gensec_ntlmssp_context
);
57 struct ntlmssp_state
*ntlmssp_state
= gensec_ntlmssp
->ntlmssp_state
;
58 const char *domain
= ntlmssp_state
->domain
;
59 const char *workstation
= cli_credentials_get_workstation(gensec_security
->credentials
);
62 /* These don't really matter in the initial packet, so don't panic if they are not set */
71 if (ntlmssp_state
->unicode
) {
72 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_UNICODE
;
74 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_OEM
;
77 if (ntlmssp_state
->use_ntlmv2
) {
78 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_NTLM2
;
81 /* generate the ntlmssp negotiate packet */
82 status
= msrpc_gen(out_mem_ctx
,
86 ntlmssp_state
->neg_flags
,
90 if (!NT_STATUS_IS_OK(status
)) {
94 ntlmssp_state
->expected_state
= NTLMSSP_CHALLENGE
;
96 return NT_STATUS_MORE_PROCESSING_REQUIRED
;
100 * Next state function for the Challenge Packet. Generate an auth packet.
102 * @param gensec_security GENSEC state
103 * @param out_mem_ctx Memory context for *out
104 * @param in The server challnege, as a DATA_BLOB. reply.data must be NULL
105 * @param out The next request (auth packet) to the server, as an allocated DATA_BLOB, on the out_mem_ctx context
106 * @return Errors or NT_STATUS_OK.
109 NTSTATUS
ntlmssp_client_challenge(struct gensec_security
*gensec_security
,
110 TALLOC_CTX
*out_mem_ctx
,
111 const DATA_BLOB in
, DATA_BLOB
*out
)
113 struct gensec_ntlmssp_context
*gensec_ntlmssp
=
114 talloc_get_type_abort(gensec_security
->private_data
,
115 struct gensec_ntlmssp_context
);
116 struct ntlmssp_state
*ntlmssp_state
= gensec_ntlmssp
->ntlmssp_state
;
117 uint32_t chal_flags
, ntlmssp_command
, unkn1
, unkn2
;
118 DATA_BLOB server_domain_blob
;
119 DATA_BLOB challenge_blob
;
120 DATA_BLOB target_info
= data_blob(NULL
, 0);
122 const char *chal_parse_string
;
123 const char *auth_gen_string
;
124 DATA_BLOB lm_response
= data_blob(NULL
, 0);
125 DATA_BLOB nt_response
= data_blob(NULL
, 0);
126 DATA_BLOB session_key
= data_blob(NULL
, 0);
127 DATA_BLOB lm_session_key
= data_blob(NULL
, 0);
128 DATA_BLOB encrypted_session_key
= data_blob(NULL
, 0);
131 const char *user
, *domain
;
133 TALLOC_CTX
*mem_ctx
= talloc_new(out_mem_ctx
);
135 return NT_STATUS_NO_MEMORY
;
138 if (!msrpc_parse(mem_ctx
,
144 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
145 dump_data(2, in
.data
, in
.length
);
146 talloc_free(mem_ctx
);
148 return NT_STATUS_INVALID_PARAMETER
;
151 data_blob_free(&server_domain_blob
);
153 DEBUG(3, ("Got challenge flags:\n"));
154 debug_ntlmssp_flags(chal_flags
);
156 ntlmssp_handle_neg_flags(ntlmssp_state
, chal_flags
, ntlmssp_state
->allow_lm_key
);
158 if (ntlmssp_state
->unicode
) {
159 if (chal_flags
& NTLMSSP_NEGOTIATE_TARGET_INFO
) {
160 chal_parse_string
= "CdUdbddB";
162 chal_parse_string
= "CdUdbdd";
164 auth_gen_string
= "CdBBUUUBd";
166 if (chal_flags
& NTLMSSP_NEGOTIATE_TARGET_INFO
) {
167 chal_parse_string
= "CdAdbddB";
169 chal_parse_string
= "CdAdbdd";
172 auth_gen_string
= "CdBBAAABd";
175 if (!msrpc_parse(mem_ctx
,
176 &in
, chal_parse_string
,
184 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
185 dump_data(2, in
.data
, in
.length
);
186 talloc_free(mem_ctx
);
187 return NT_STATUS_INVALID_PARAMETER
;
190 if (chal_flags
& NTLMSSP_TARGET_TYPE_SERVER
) {
191 ntlmssp_state
->server
.is_standalone
= true;
193 ntlmssp_state
->server
.is_standalone
= false;
195 /* TODO: parse struct_blob and fill in the rest */
196 ntlmssp_state
->server
.netbios_name
= "";
197 ntlmssp_state
->server
.netbios_domain
= server_domain
;
198 ntlmssp_state
->server
.dns_name
= "";
199 ntlmssp_state
->server
.dns_domain
= "";
201 if (challenge_blob
.length
!= 8) {
202 talloc_free(mem_ctx
);
203 return NT_STATUS_INVALID_PARAMETER
;
206 cli_credentials_get_ntlm_username_domain(gensec_security
->credentials
, mem_ctx
,
209 if (ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_NTLM2
) {
210 flags
|= CLI_CRED_NTLM2
;
212 if (ntlmssp_state
->use_ntlmv2
) {
213 flags
|= CLI_CRED_NTLMv2_AUTH
;
215 if (ntlmssp_state
->use_nt_response
) {
216 flags
|= CLI_CRED_NTLM_AUTH
;
218 if (lpcfg_client_lanman_auth(gensec_security
->settings
->lp_ctx
)) {
219 flags
|= CLI_CRED_LANMAN_AUTH
;
222 nt_status
= cli_credentials_get_ntlm_response(gensec_security
->credentials
, mem_ctx
,
223 &flags
, challenge_blob
, target_info
,
224 &lm_response
, &nt_response
,
225 &lm_session_key
, &session_key
);
227 if (!NT_STATUS_IS_OK(nt_status
)) {
231 if (!(flags
& CLI_CRED_LANMAN_AUTH
)) {
232 /* LM Key is still possible, just silly. Fortunetly
233 * we require command line options to end up here */
234 /* ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; */
237 if (!(flags
& CLI_CRED_NTLM2
)) {
238 /* NTLM2 is incompatible... */
239 ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_NTLM2
;
242 if ((ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_LM_KEY
)
243 && lpcfg_client_lanman_auth(gensec_security
->settings
->lp_ctx
) && lm_session_key
.length
== 16) {
244 DATA_BLOB new_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
245 if (lm_response
.length
== 24) {
246 SMBsesskeygen_lm_sess_key(lm_session_key
.data
, lm_response
.data
,
247 new_session_key
.data
);
249 static const uint8_t zeros
[24];
250 SMBsesskeygen_lm_sess_key(lm_session_key
.data
, zeros
,
251 new_session_key
.data
);
253 session_key
= new_session_key
;
254 dump_data_pw("LM session key\n", session_key
.data
, session_key
.length
);
258 /* Key exchange encryptes a new client-generated session key with
259 the password-derived key */
260 if (ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_KEY_EXCH
) {
261 /* Make up a new session key */
262 uint8_t client_session_key
[16];
263 generate_secret_buffer(client_session_key
, sizeof(client_session_key
));
265 /* Encrypt the new session key with the old one */
266 encrypted_session_key
= data_blob_talloc(ntlmssp_state
,
267 client_session_key
, sizeof(client_session_key
));
268 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key
.data
, encrypted_session_key
.length
);
269 arcfour_crypt(encrypted_session_key
.data
, session_key
.data
, encrypted_session_key
.length
);
270 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key
.data
, encrypted_session_key
.length
);
272 /* Mark the new session key as the 'real' session key */
273 session_key
= data_blob_talloc(mem_ctx
, client_session_key
, sizeof(client_session_key
));
276 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
277 debug_ntlmssp_flags(ntlmssp_state
->neg_flags
);
279 /* this generates the actual auth packet */
280 nt_status
= msrpc_gen(mem_ctx
,
281 out
, auth_gen_string
,
284 lm_response
.data
, lm_response
.length
,
285 nt_response
.data
, nt_response
.length
,
288 cli_credentials_get_workstation(gensec_security
->credentials
),
289 encrypted_session_key
.data
, encrypted_session_key
.length
,
290 ntlmssp_state
->neg_flags
);
291 if (!NT_STATUS_IS_OK(nt_status
)) {
292 talloc_free(mem_ctx
);
296 ntlmssp_state
->session_key
= session_key
;
297 talloc_steal(ntlmssp_state
, session_key
.data
);
299 talloc_steal(out_mem_ctx
, out
->data
);
301 ntlmssp_state
->chal
= challenge_blob
;
302 ntlmssp_state
->lm_resp
= lm_response
;
303 talloc_steal(ntlmssp_state
->lm_resp
.data
, lm_response
.data
);
304 ntlmssp_state
->nt_resp
= nt_response
;
305 talloc_steal(ntlmssp_state
->nt_resp
.data
, nt_response
.data
);
307 ntlmssp_state
->expected_state
= NTLMSSP_DONE
;
309 if (gensec_security
->want_features
& (GENSEC_FEATURE_SIGN
|GENSEC_FEATURE_SEAL
)) {
310 nt_status
= ntlmssp_sign_init(ntlmssp_state
);
311 if (!NT_STATUS_IS_OK(nt_status
)) {
312 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n",
313 nt_errstr(nt_status
)));
314 talloc_free(mem_ctx
);
319 talloc_free(mem_ctx
);
323 NTSTATUS
gensec_ntlmssp_client_start(struct gensec_security
*gensec_security
)
325 struct gensec_ntlmssp_context
*gensec_ntlmssp
;
326 struct ntlmssp_state
*ntlmssp_state
;
329 nt_status
= gensec_ntlmssp_start(gensec_security
);
330 NT_STATUS_NOT_OK_RETURN(nt_status
);
333 talloc_get_type_abort(gensec_security
->private_data
,
334 struct gensec_ntlmssp_context
);
336 ntlmssp_state
= talloc_zero(gensec_ntlmssp
,
337 struct ntlmssp_state
);
338 if (!ntlmssp_state
) {
339 return NT_STATUS_NO_MEMORY
;
342 ntlmssp_state
->callback_private
= gensec_ntlmssp
;
344 gensec_ntlmssp
->ntlmssp_state
= ntlmssp_state
;
346 ntlmssp_state
= gensec_ntlmssp
->ntlmssp_state
;
348 ntlmssp_state
->role
= NTLMSSP_CLIENT
;
350 ntlmssp_state
->domain
= lpcfg_workgroup(gensec_security
->settings
->lp_ctx
);
352 ntlmssp_state
->unicode
= gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "unicode", true);
354 ntlmssp_state
->use_nt_response
= gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "send_nt_reponse", true);
356 ntlmssp_state
->allow_lm_key
= (lpcfg_client_lanman_auth(gensec_security
->settings
->lp_ctx
)
357 && (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "allow_lm_key", false)
358 || gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "lm_key", false)));
360 ntlmssp_state
->use_ntlmv2
= lpcfg_client_ntlmv2_auth(gensec_security
->settings
->lp_ctx
);
362 ntlmssp_state
->expected_state
= NTLMSSP_INITIAL
;
364 ntlmssp_state
->neg_flags
=
365 NTLMSSP_NEGOTIATE_NTLM
|
366 NTLMSSP_REQUEST_TARGET
;
368 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "128bit", true)) {
369 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_128
;
372 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "56bit", false)) {
373 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_56
;
376 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "lm_key", false)) {
377 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_LM_KEY
;
380 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "keyexchange", true)) {
381 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_KEY_EXCH
;
384 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "alwayssign", true)) {
385 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_ALWAYS_SIGN
;
388 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "ntlm2", true)) {
389 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_NTLM2
;
391 /* apparently we can't do ntlmv2 if we don't do ntlm2 */
392 ntlmssp_state
->use_ntlmv2
= false;
395 if (gensec_security
->want_features
& GENSEC_FEATURE_SESSION_KEY
) {
397 * We need to set this to allow a later SetPassword
398 * via the SAMR pipe to succeed. Strange.... We could
399 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
401 * Without this, Windows will not create the master key
402 * that it thinks is only used for NTLMSSP signing and
403 * sealing. (It is actually pulled out and used directly)
405 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_SIGN
;
407 if (gensec_security
->want_features
& GENSEC_FEATURE_SIGN
) {
408 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_SIGN
;
410 if (gensec_security
->want_features
& GENSEC_FEATURE_SEAL
) {
411 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_SIGN
;
412 ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_SEAL
;