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 "../lib/crypto/crypto.h"
27 #include "../libcli/auth/libcli_auth.h"
28 #include "auth/credentials/credentials.h"
29 #include "auth/gensec/gensec.h"
30 #include "param/param.h"
32 /*********************************************************************
34 *********************************************************************/
37 * Next state function for the Initial packet
39 * @param ntlmssp_state NTLMSSP State
40 * @param out_mem_ctx The DATA_BLOB *out will be allocated on this context
41 * @param in A NULL data blob (input ignored)
42 * @param out The initial negotiate request to the server, as an talloc()ed DATA_BLOB, on out_mem_ctx
43 * @return Errors or NT_STATUS_OK.
46 NTSTATUS ntlmssp_client_initial(struct gensec_security *gensec_security,
47 TALLOC_CTX *out_mem_ctx,
48 DATA_BLOB in, DATA_BLOB *out)
50 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
51 const char *domain = gensec_ntlmssp_state->domain;
52 const char *workstation = cli_credentials_get_workstation(gensec_security->credentials);
54 /* These don't really matter in the initial packet, so don't panic if they are not set */
63 if (gensec_ntlmssp_state->unicode) {
64 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
66 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
69 if (gensec_ntlmssp_state->use_ntlmv2) {
70 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
73 /* generate the ntlmssp negotiate packet */
74 msrpc_gen(out_mem_ctx,
78 gensec_ntlmssp_state->neg_flags,
82 gensec_ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
84 return NT_STATUS_MORE_PROCESSING_REQUIRED;
88 * Next state function for the Challenge Packet. Generate an auth packet.
90 * @param gensec_security GENSEC state
91 * @param out_mem_ctx Memory context for *out
92 * @param in The server challnege, as a DATA_BLOB. reply.data must be NULL
93 * @param out The next request (auth packet) to the server, as an allocated DATA_BLOB, on the out_mem_ctx context
94 * @return Errors or NT_STATUS_OK.
97 NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security,
98 TALLOC_CTX *out_mem_ctx,
99 const DATA_BLOB in, DATA_BLOB *out)
101 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
102 uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
103 DATA_BLOB server_domain_blob;
104 DATA_BLOB challenge_blob;
105 DATA_BLOB target_info = data_blob(NULL, 0);
107 const char *chal_parse_string;
108 const char *auth_gen_string;
109 DATA_BLOB lm_response = data_blob(NULL, 0);
110 DATA_BLOB nt_response = data_blob(NULL, 0);
111 DATA_BLOB session_key = data_blob(NULL, 0);
112 DATA_BLOB lm_session_key = data_blob(NULL, 0);
113 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
116 const char *user, *domain;
118 TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
120 return NT_STATUS_NO_MEMORY;
123 if (!msrpc_parse(mem_ctx,
129 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
130 dump_data(2, in.data, in.length);
131 talloc_free(mem_ctx);
133 return NT_STATUS_INVALID_PARAMETER;
136 data_blob_free(&server_domain_blob);
138 DEBUG(3, ("Got challenge flags:\n"));
139 debug_ntlmssp_flags(chal_flags);
141 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, chal_flags, gensec_ntlmssp_state->allow_lm_key);
143 if (gensec_ntlmssp_state->unicode) {
144 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
145 chal_parse_string = "CdUdbddB";
147 chal_parse_string = "CdUdbdd";
149 auth_gen_string = "CdBBUUUBd";
151 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
152 chal_parse_string = "CdAdbddB";
154 chal_parse_string = "CdAdbdd";
157 auth_gen_string = "CdBBAAABd";
160 if (!msrpc_parse(mem_ctx,
161 &in, chal_parse_string,
169 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
170 dump_data(2, in.data, in.length);
171 talloc_free(mem_ctx);
172 return NT_STATUS_INVALID_PARAMETER;
175 gensec_ntlmssp_state->server_domain = server_domain;
177 if (challenge_blob.length != 8) {
178 talloc_free(mem_ctx);
179 return NT_STATUS_INVALID_PARAMETER;
182 cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx,
185 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
186 flags |= CLI_CRED_NTLM2;
188 if (gensec_ntlmssp_state->use_ntlmv2) {
189 flags |= CLI_CRED_NTLMv2_AUTH;
191 if (gensec_ntlmssp_state->use_nt_response) {
192 flags |= CLI_CRED_NTLM_AUTH;
194 if (lp_client_lanman_auth(gensec_security->settings->lp_ctx)) {
195 flags |= CLI_CRED_LANMAN_AUTH;
198 nt_status = cli_credentials_get_ntlm_response(gensec_security->credentials, mem_ctx,
199 &flags, challenge_blob, target_info,
200 &lm_response, &nt_response,
201 &lm_session_key, &session_key);
203 if (!NT_STATUS_IS_OK(nt_status)) {
207 if (!(flags & CLI_CRED_LANMAN_AUTH)) {
208 /* LM Key is still possible, just silly. Fortunetly
209 * we require command line options to end up here */
210 /* gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; */
213 if (!(flags & CLI_CRED_NTLM2)) {
214 /* NTLM2 is incompatible... */
215 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
218 if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
219 && lp_client_lanman_auth(gensec_security->settings->lp_ctx) && lm_session_key.length == 16) {
220 DATA_BLOB new_session_key = data_blob_talloc(mem_ctx, NULL, 16);
221 if (lm_response.length == 24) {
222 SMBsesskeygen_lm_sess_key(lm_session_key.data, lm_response.data,
223 new_session_key.data);
225 static const uint8_t zeros[24];
226 SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros,
227 new_session_key.data);
229 session_key = new_session_key;
230 dump_data_pw("LM session key\n", session_key.data, session_key.length);
234 /* Key exchange encryptes a new client-generated session key with
235 the password-derived key */
236 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
237 /* Make up a new session key */
238 uint8_t client_session_key[16];
239 generate_secret_buffer(client_session_key, sizeof(client_session_key));
241 /* Encrypt the new session key with the old one */
242 encrypted_session_key = data_blob_talloc(gensec_ntlmssp_state,
243 client_session_key, sizeof(client_session_key));
244 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
245 arcfour_crypt(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
246 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
248 /* Mark the new session key as the 'real' session key */
249 session_key = data_blob_talloc(mem_ctx, client_session_key, sizeof(client_session_key));
252 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
253 debug_ntlmssp_flags(gensec_ntlmssp_state->neg_flags);
255 /* this generates the actual auth packet */
256 if (!msrpc_gen(mem_ctx,
257 out, auth_gen_string,
260 lm_response.data, lm_response.length,
261 nt_response.data, nt_response.length,
264 cli_credentials_get_workstation(gensec_security->credentials),
265 encrypted_session_key.data, encrypted_session_key.length,
266 gensec_ntlmssp_state->neg_flags)) {
267 talloc_free(mem_ctx);
268 return NT_STATUS_NO_MEMORY;
271 gensec_ntlmssp_state->session_key = session_key;
272 talloc_steal(gensec_ntlmssp_state, session_key.data);
274 talloc_steal(out_mem_ctx, out->data);
276 gensec_ntlmssp_state->chal = challenge_blob;
277 gensec_ntlmssp_state->lm_resp = lm_response;
278 talloc_steal(gensec_ntlmssp_state->lm_resp.data, lm_response.data);
279 gensec_ntlmssp_state->nt_resp = nt_response;
280 talloc_steal(gensec_ntlmssp_state->nt_resp.data, nt_response.data);
282 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
284 if (gensec_security->want_features & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL)) {
285 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
286 if (!NT_STATUS_IS_OK(nt_status)) {
287 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n",
288 nt_errstr(nt_status)));
289 talloc_free(mem_ctx);
294 talloc_free(mem_ctx);
298 NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_security)
300 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
303 nt_status = gensec_ntlmssp_start(gensec_security);
304 NT_STATUS_NOT_OK_RETURN(nt_status);
306 gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
308 gensec_ntlmssp_state->role = NTLMSSP_CLIENT;
310 gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->settings->lp_ctx);
312 gensec_ntlmssp_state->unicode = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "unicode", true);
314 gensec_ntlmssp_state->use_nt_response = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "send_nt_reponse", true);
316 gensec_ntlmssp_state->allow_lm_key = (lp_client_lanman_auth(gensec_security->settings->lp_ctx)
317 && (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "allow_lm_key", false)
318 || gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)));
320 gensec_ntlmssp_state->use_ntlmv2 = lp_client_ntlmv2_auth(gensec_security->settings->lp_ctx);
322 gensec_ntlmssp_state->expected_state = NTLMSSP_INITIAL;
324 gensec_ntlmssp_state->neg_flags =
325 NTLMSSP_NEGOTIATE_NTLM |
326 NTLMSSP_REQUEST_TARGET;
328 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "128bit", true)) {
329 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
332 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "56bit", false)) {
333 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
336 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)) {
337 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
340 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "keyexchange", true)) {
341 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
344 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "alwayssign", true)) {
345 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
348 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "ntlm2", true)) {
349 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
351 /* apparently we can't do ntlmv2 if we don't do ntlm2 */
352 gensec_ntlmssp_state->use_ntlmv2 = false;
355 if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
357 * We need to set this to allow a later SetPassword
358 * via the SAMR pipe to succeed. Strange.... We could
359 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
361 * Without this, Windows will not create the master key
362 * that it thinks is only used for NTLMSSP signing and
363 * sealing. (It is actually pulled out and used directly)
365 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
367 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
368 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
370 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
371 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
372 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
375 gensec_security->private_data = gensec_ntlmssp_state;