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_context *gensec_ntlmssp =
51 talloc_get_type_abort(gensec_security->private_data,
52 struct gensec_ntlmssp_context);
53 struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
54 const char *domain = ntlmssp_state->domain;
55 const char *workstation = cli_credentials_get_workstation(gensec_security->credentials);
57 /* These don't really matter in the initial packet, so don't panic if they are not set */
66 if (ntlmssp_state->unicode) {
67 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
69 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
72 if (ntlmssp_state->use_ntlmv2) {
73 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
76 /* generate the ntlmssp negotiate packet */
77 msrpc_gen(out_mem_ctx,
81 ntlmssp_state->neg_flags,
85 ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
87 return NT_STATUS_MORE_PROCESSING_REQUIRED;
91 * Next state function for the Challenge Packet. Generate an auth packet.
93 * @param gensec_security GENSEC state
94 * @param out_mem_ctx Memory context for *out
95 * @param in The server challnege, as a DATA_BLOB. reply.data must be NULL
96 * @param out The next request (auth packet) to the server, as an allocated DATA_BLOB, on the out_mem_ctx context
97 * @return Errors or NT_STATUS_OK.
100 NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security,
101 TALLOC_CTX *out_mem_ctx,
102 const DATA_BLOB in, DATA_BLOB *out)
104 struct gensec_ntlmssp_context *gensec_ntlmssp =
105 talloc_get_type_abort(gensec_security->private_data,
106 struct gensec_ntlmssp_context);
107 struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
108 uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
109 DATA_BLOB server_domain_blob;
110 DATA_BLOB challenge_blob;
111 DATA_BLOB target_info = data_blob(NULL, 0);
113 const char *chal_parse_string;
114 const char *auth_gen_string;
115 DATA_BLOB lm_response = data_blob(NULL, 0);
116 DATA_BLOB nt_response = data_blob(NULL, 0);
117 DATA_BLOB session_key = data_blob(NULL, 0);
118 DATA_BLOB lm_session_key = data_blob(NULL, 0);
119 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
122 const char *user, *domain;
124 TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
126 return NT_STATUS_NO_MEMORY;
129 if (!msrpc_parse(mem_ctx,
135 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
136 dump_data(2, in.data, in.length);
137 talloc_free(mem_ctx);
139 return NT_STATUS_INVALID_PARAMETER;
142 data_blob_free(&server_domain_blob);
144 DEBUG(3, ("Got challenge flags:\n"));
145 debug_ntlmssp_flags(chal_flags);
147 ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, ntlmssp_state->allow_lm_key);
149 if (ntlmssp_state->unicode) {
150 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
151 chal_parse_string = "CdUdbddB";
153 chal_parse_string = "CdUdbdd";
155 auth_gen_string = "CdBBUUUBd";
157 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
158 chal_parse_string = "CdAdbddB";
160 chal_parse_string = "CdAdbdd";
163 auth_gen_string = "CdBBAAABd";
166 if (!msrpc_parse(mem_ctx,
167 &in, chal_parse_string,
175 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
176 dump_data(2, in.data, in.length);
177 talloc_free(mem_ctx);
178 return NT_STATUS_INVALID_PARAMETER;
181 if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
182 ntlmssp_state->server.is_standalone = true;
184 ntlmssp_state->server.is_standalone = false;
186 /* TODO: parse struct_blob and fill in the rest */
187 ntlmssp_state->server.netbios_name = "";
188 ntlmssp_state->server.netbios_domain = server_domain;
189 ntlmssp_state->server.dns_name = "";
190 ntlmssp_state->server.dns_domain = "";
192 if (challenge_blob.length != 8) {
193 talloc_free(mem_ctx);
194 return NT_STATUS_INVALID_PARAMETER;
197 cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx,
200 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
201 flags |= CLI_CRED_NTLM2;
203 if (ntlmssp_state->use_ntlmv2) {
204 flags |= CLI_CRED_NTLMv2_AUTH;
206 if (ntlmssp_state->use_nt_response) {
207 flags |= CLI_CRED_NTLM_AUTH;
209 if (lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx)) {
210 flags |= CLI_CRED_LANMAN_AUTH;
213 nt_status = cli_credentials_get_ntlm_response(gensec_security->credentials, mem_ctx,
214 &flags, challenge_blob, target_info,
215 &lm_response, &nt_response,
216 &lm_session_key, &session_key);
218 if (!NT_STATUS_IS_OK(nt_status)) {
222 if (!(flags & CLI_CRED_LANMAN_AUTH)) {
223 /* LM Key is still possible, just silly. Fortunetly
224 * we require command line options to end up here */
225 /* ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; */
228 if (!(flags & CLI_CRED_NTLM2)) {
229 /* NTLM2 is incompatible... */
230 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
233 if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
234 && lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx) && lm_session_key.length == 16) {
235 DATA_BLOB new_session_key = data_blob_talloc(mem_ctx, NULL, 16);
236 if (lm_response.length == 24) {
237 SMBsesskeygen_lm_sess_key(lm_session_key.data, lm_response.data,
238 new_session_key.data);
240 static const uint8_t zeros[24];
241 SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros,
242 new_session_key.data);
244 session_key = new_session_key;
245 dump_data_pw("LM session key\n", session_key.data, session_key.length);
249 /* Key exchange encryptes a new client-generated session key with
250 the password-derived key */
251 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
252 /* Make up a new session key */
253 uint8_t client_session_key[16];
254 generate_secret_buffer(client_session_key, sizeof(client_session_key));
256 /* Encrypt the new session key with the old one */
257 encrypted_session_key = data_blob_talloc(ntlmssp_state,
258 client_session_key, sizeof(client_session_key));
259 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
260 arcfour_crypt(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
261 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
263 /* Mark the new session key as the 'real' session key */
264 session_key = data_blob_talloc(mem_ctx, client_session_key, sizeof(client_session_key));
267 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
268 debug_ntlmssp_flags(ntlmssp_state->neg_flags);
270 /* this generates the actual auth packet */
271 if (!msrpc_gen(mem_ctx,
272 out, auth_gen_string,
275 lm_response.data, lm_response.length,
276 nt_response.data, nt_response.length,
279 cli_credentials_get_workstation(gensec_security->credentials),
280 encrypted_session_key.data, encrypted_session_key.length,
281 ntlmssp_state->neg_flags)) {
282 talloc_free(mem_ctx);
283 return NT_STATUS_NO_MEMORY;
286 ntlmssp_state->session_key = session_key;
287 talloc_steal(ntlmssp_state, session_key.data);
289 talloc_steal(out_mem_ctx, out->data);
291 ntlmssp_state->chal = challenge_blob;
292 ntlmssp_state->lm_resp = lm_response;
293 talloc_steal(ntlmssp_state->lm_resp.data, lm_response.data);
294 ntlmssp_state->nt_resp = nt_response;
295 talloc_steal(ntlmssp_state->nt_resp.data, nt_response.data);
297 ntlmssp_state->expected_state = NTLMSSP_DONE;
299 if (gensec_security->want_features & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL)) {
300 nt_status = ntlmssp_sign_init(ntlmssp_state);
301 if (!NT_STATUS_IS_OK(nt_status)) {
302 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n",
303 nt_errstr(nt_status)));
304 talloc_free(mem_ctx);
309 talloc_free(mem_ctx);
313 NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_security)
315 struct gensec_ntlmssp_context *gensec_ntlmssp;
316 struct ntlmssp_state *ntlmssp_state;
319 nt_status = gensec_ntlmssp_start(gensec_security);
320 NT_STATUS_NOT_OK_RETURN(nt_status);
322 gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
323 struct gensec_ntlmssp_context);
324 ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
326 ntlmssp_state->role = NTLMSSP_CLIENT;
328 ntlmssp_state->domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
330 ntlmssp_state->unicode = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "unicode", true);
332 ntlmssp_state->use_nt_response = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "send_nt_reponse", true);
334 ntlmssp_state->allow_lm_key = (lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx)
335 && (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "allow_lm_key", false)
336 || gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)));
338 ntlmssp_state->use_ntlmv2 = lpcfg_client_ntlmv2_auth(gensec_security->settings->lp_ctx);
340 ntlmssp_state->expected_state = NTLMSSP_INITIAL;
342 ntlmssp_state->neg_flags =
343 NTLMSSP_NEGOTIATE_NTLM |
344 NTLMSSP_REQUEST_TARGET;
346 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "128bit", true)) {
347 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
350 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "56bit", false)) {
351 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
354 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)) {
355 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
358 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "keyexchange", true)) {
359 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
362 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "alwayssign", true)) {
363 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
366 if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "ntlm2", true)) {
367 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
369 /* apparently we can't do ntlmv2 if we don't do ntlm2 */
370 ntlmssp_state->use_ntlmv2 = false;
373 if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
375 * We need to set this to allow a later SetPassword
376 * via the SAMR pipe to succeed. Strange.... We could
377 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
379 * Without this, Windows will not create the master key
380 * that it thinks is only used for NTLMSSP signing and
381 * sealing. (It is actually pulled out and used directly)
383 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
385 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
386 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
388 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
389 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
390 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;