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 "param/param.h"
33 /*********************************************************************
35 *********************************************************************/
38 * Next state function for the Initial packet
40 * @param ntlmssp_state NTLMSSP State
41 * @param out_mem_ctx The DATA_BLOB *out will be allocated on this context
42 * @param in A NULL data blob (input ignored)
43 * @param out The initial negotiate request to the server, as an talloc()ed DATA_BLOB, on out_mem_ctx
44 * @return Errors or NT_STATUS_OK.
47 NTSTATUS
ntlmssp_client_initial(struct gensec_security
*gensec_security
,
48 TALLOC_CTX
*out_mem_ctx
,
49 DATA_BLOB in
, DATA_BLOB
*out
)
51 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
52 const char *domain
= gensec_ntlmssp_state
->domain
;
53 const char *workstation
= cli_credentials_get_workstation(gensec_security
->credentials
);
55 /* These don't really matter in the initial packet, so don't panic if they are not set */
64 if (gensec_ntlmssp_state
->unicode
) {
65 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_UNICODE
;
67 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_OEM
;
70 if (gensec_ntlmssp_state
->use_ntlmv2
) {
71 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_NTLM2
;
74 /* generate the ntlmssp negotiate packet */
75 msrpc_gen(out_mem_ctx
,
79 gensec_ntlmssp_state
->neg_flags
,
83 gensec_ntlmssp_state
->expected_state
= NTLMSSP_CHALLENGE
;
85 return NT_STATUS_MORE_PROCESSING_REQUIRED
;
89 * Next state function for the Challenge Packet. Generate an auth packet.
91 * @param gensec_security GENSEC state
92 * @param out_mem_ctx Memory context for *out
93 * @param in The server challnege, as a DATA_BLOB. reply.data must be NULL
94 * @param out The next request (auth packet) to the server, as an allocated DATA_BLOB, on the out_mem_ctx context
95 * @return Errors or NT_STATUS_OK.
98 NTSTATUS
ntlmssp_client_challenge(struct gensec_security
*gensec_security
,
99 TALLOC_CTX
*out_mem_ctx
,
100 const DATA_BLOB in
, DATA_BLOB
*out
)
102 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
103 uint32_t chal_flags
, ntlmssp_command
, unkn1
, unkn2
;
104 DATA_BLOB server_domain_blob
;
105 DATA_BLOB challenge_blob
;
106 DATA_BLOB target_info
= data_blob(NULL
, 0);
108 const char *chal_parse_string
;
109 const char *auth_gen_string
;
110 DATA_BLOB lm_response
= data_blob(NULL
, 0);
111 DATA_BLOB nt_response
= data_blob(NULL
, 0);
112 DATA_BLOB session_key
= data_blob(NULL
, 0);
113 DATA_BLOB lm_session_key
= data_blob(NULL
, 0);
114 DATA_BLOB encrypted_session_key
= data_blob(NULL
, 0);
117 const char *user
, *domain
;
119 TALLOC_CTX
*mem_ctx
= talloc_new(out_mem_ctx
);
121 return NT_STATUS_NO_MEMORY
;
124 if (!msrpc_parse(mem_ctx
,
130 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
131 dump_data(2, in
.data
, in
.length
);
132 talloc_free(mem_ctx
);
134 return NT_STATUS_INVALID_PARAMETER
;
137 data_blob_free(&server_domain_blob
);
139 DEBUG(3, ("Got challenge flags:\n"));
140 debug_ntlmssp_flags(chal_flags
);
142 ntlmssp_handle_neg_flags(gensec_ntlmssp_state
, chal_flags
, gensec_ntlmssp_state
->allow_lm_key
);
144 if (gensec_ntlmssp_state
->unicode
) {
145 if (chal_flags
& NTLMSSP_CHAL_TARGET_INFO
) {
146 chal_parse_string
= "CdUdbddB";
148 chal_parse_string
= "CdUdbdd";
150 auth_gen_string
= "CdBBUUUBd";
152 if (chal_flags
& NTLMSSP_CHAL_TARGET_INFO
) {
153 chal_parse_string
= "CdAdbddB";
155 chal_parse_string
= "CdAdbdd";
158 auth_gen_string
= "CdBBAAABd";
161 if (!msrpc_parse(mem_ctx
,
162 &in
, chal_parse_string
,
170 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
171 dump_data(2, in
.data
, in
.length
);
172 talloc_free(mem_ctx
);
173 return NT_STATUS_INVALID_PARAMETER
;
176 gensec_ntlmssp_state
->server_domain
= server_domain
;
178 if (challenge_blob
.length
!= 8) {
179 talloc_free(mem_ctx
);
180 return NT_STATUS_INVALID_PARAMETER
;
183 cli_credentials_get_ntlm_username_domain(gensec_security
->credentials
, mem_ctx
,
186 if (gensec_ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_NTLM2
) {
187 flags
|= CLI_CRED_NTLM2
;
189 if (gensec_ntlmssp_state
->use_ntlmv2
) {
190 flags
|= CLI_CRED_NTLMv2_AUTH
;
192 if (gensec_ntlmssp_state
->use_nt_response
) {
193 flags
|= CLI_CRED_NTLM_AUTH
;
195 if (lp_client_lanman_auth(gensec_security
->settings
->lp_ctx
)) {
196 flags
|= CLI_CRED_LANMAN_AUTH
;
199 nt_status
= cli_credentials_get_ntlm_response(gensec_security
->credentials
, mem_ctx
,
200 &flags
, challenge_blob
, target_info
,
201 &lm_response
, &nt_response
,
202 &lm_session_key
, &session_key
);
204 if (!NT_STATUS_IS_OK(nt_status
)) {
208 if (!(flags
& CLI_CRED_LANMAN_AUTH
)) {
209 /* LM Key is still possible, just silly. Fortunetly
210 * we require command line options to end up here */
211 /* gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; */
214 if (!(flags
& CLI_CRED_NTLM2
)) {
215 /* NTLM2 is incompatible... */
216 gensec_ntlmssp_state
->neg_flags
&= ~NTLMSSP_NEGOTIATE_NTLM2
;
219 if ((gensec_ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_LM_KEY
)
220 && lp_client_lanman_auth(gensec_security
->settings
->lp_ctx
) && lm_session_key
.length
== 16) {
221 DATA_BLOB new_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
222 if (lm_response
.length
== 24) {
223 SMBsesskeygen_lm_sess_key(lm_session_key
.data
, lm_response
.data
,
224 new_session_key
.data
);
226 static const uint8_t zeros
[24];
227 SMBsesskeygen_lm_sess_key(lm_session_key
.data
, zeros
,
228 new_session_key
.data
);
230 session_key
= new_session_key
;
231 dump_data_pw("LM session key\n", session_key
.data
, session_key
.length
);
235 /* Key exchange encryptes a new client-generated session key with
236 the password-derived key */
237 if (gensec_ntlmssp_state
->neg_flags
& NTLMSSP_NEGOTIATE_KEY_EXCH
) {
238 /* Make up a new session key */
239 uint8_t client_session_key
[16];
240 generate_secret_buffer(client_session_key
, sizeof(client_session_key
));
242 /* Encrypt the new session key with the old one */
243 encrypted_session_key
= data_blob_talloc(gensec_ntlmssp_state
,
244 client_session_key
, sizeof(client_session_key
));
245 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key
.data
, encrypted_session_key
.length
);
246 arcfour_crypt(encrypted_session_key
.data
, session_key
.data
, encrypted_session_key
.length
);
247 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key
.data
, encrypted_session_key
.length
);
249 /* Mark the new session key as the 'real' session key */
250 session_key
= data_blob_talloc(mem_ctx
, client_session_key
, sizeof(client_session_key
));
253 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
254 debug_ntlmssp_flags(gensec_ntlmssp_state
->neg_flags
);
256 /* this generates the actual auth packet */
257 if (!msrpc_gen(mem_ctx
,
258 out
, auth_gen_string
,
261 lm_response
.data
, lm_response
.length
,
262 nt_response
.data
, nt_response
.length
,
265 cli_credentials_get_workstation(gensec_security
->credentials
),
266 encrypted_session_key
.data
, encrypted_session_key
.length
,
267 gensec_ntlmssp_state
->neg_flags
)) {
268 talloc_free(mem_ctx
);
269 return NT_STATUS_NO_MEMORY
;
272 gensec_ntlmssp_state
->session_key
= session_key
;
273 talloc_steal(gensec_ntlmssp_state
, session_key
.data
);
275 talloc_steal(out_mem_ctx
, out
->data
);
277 gensec_ntlmssp_state
->chal
= challenge_blob
;
278 gensec_ntlmssp_state
->lm_resp
= lm_response
;
279 talloc_steal(gensec_ntlmssp_state
->lm_resp
.data
, lm_response
.data
);
280 gensec_ntlmssp_state
->nt_resp
= nt_response
;
281 talloc_steal(gensec_ntlmssp_state
->nt_resp
.data
, nt_response
.data
);
283 gensec_ntlmssp_state
->expected_state
= NTLMSSP_DONE
;
285 if (gensec_security
->want_features
& (GENSEC_FEATURE_SIGN
|GENSEC_FEATURE_SEAL
)) {
286 nt_status
= ntlmssp_sign_init(gensec_ntlmssp_state
);
287 if (!NT_STATUS_IS_OK(nt_status
)) {
288 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n",
289 nt_errstr(nt_status
)));
290 talloc_free(mem_ctx
);
295 talloc_free(mem_ctx
);
299 NTSTATUS
gensec_ntlmssp_client_start(struct gensec_security
*gensec_security
)
301 struct gensec_ntlmssp_state
*gensec_ntlmssp_state
;
304 nt_status
= gensec_ntlmssp_start(gensec_security
);
305 NT_STATUS_NOT_OK_RETURN(nt_status
);
307 gensec_ntlmssp_state
= (struct gensec_ntlmssp_state
*)gensec_security
->private_data
;
309 gensec_ntlmssp_state
->role
= NTLMSSP_CLIENT
;
311 gensec_ntlmssp_state
->domain
= lp_workgroup(gensec_security
->settings
->lp_ctx
);
313 gensec_ntlmssp_state
->unicode
= gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "unicode", true);
315 gensec_ntlmssp_state
->use_nt_response
= gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "send_nt_reponse", true);
317 gensec_ntlmssp_state
->allow_lm_key
= (lp_client_lanman_auth(gensec_security
->settings
->lp_ctx
)
318 && (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "allow_lm_key", false)
319 || gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "lm_key", false)));
321 gensec_ntlmssp_state
->use_ntlmv2
= lp_client_ntlmv2_auth(gensec_security
->settings
->lp_ctx
);
323 gensec_ntlmssp_state
->expected_state
= NTLMSSP_INITIAL
;
325 gensec_ntlmssp_state
->neg_flags
=
326 NTLMSSP_NEGOTIATE_NTLM
|
327 NTLMSSP_REQUEST_TARGET
;
329 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "128bit", true)) {
330 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_128
;
333 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "56bit", false)) {
334 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_56
;
337 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "lm_key", false)) {
338 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_LM_KEY
;
341 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "keyexchange", true)) {
342 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_KEY_EXCH
;
345 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "alwayssign", true)) {
346 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_ALWAYS_SIGN
;
349 if (gensec_setting_bool(gensec_security
->settings
, "ntlmssp_client", "ntlm2", true)) {
350 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_NTLM2
;
352 /* apparently we can't do ntlmv2 if we don't do ntlm2 */
353 gensec_ntlmssp_state
->use_ntlmv2
= false;
356 if (gensec_security
->want_features
& GENSEC_FEATURE_SESSION_KEY
) {
358 * We need to set this to allow a later SetPassword
359 * via the SAMR pipe to succeed. Strange.... We could
360 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
362 * Without this, Windows will not create the master key
363 * that it thinks is only used for NTLMSSP signing and
364 * sealing. (It is actually pulled out and used directly)
366 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_SIGN
;
368 if (gensec_security
->want_features
& GENSEC_FEATURE_SIGN
) {
369 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_SIGN
;
371 if (gensec_security
->want_features
& GENSEC_FEATURE_SEAL
) {
372 gensec_ntlmssp_state
->neg_flags
|= NTLMSSP_NEGOTIATE_SEAL
;
375 gensec_security
->private_data
= gensec_ntlmssp_state
;