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,
76 lp_iconv_convenience(gensec_security->lp_ctx),
80 gensec_ntlmssp_state->neg_flags,
84 gensec_ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
86 return NT_STATUS_MORE_PROCESSING_REQUIRED;
90 * Next state function for the Challenge Packet. Generate an auth packet.
92 * @param gensec_security GENSEC state
93 * @param out_mem_ctx Memory context for *out
94 * @param in The server challnege, as a DATA_BLOB. reply.data must be NULL
95 * @param out The next request (auth packet) to the server, as an allocated DATA_BLOB, on the out_mem_ctx context
96 * @return Errors or NT_STATUS_OK.
99 NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security,
100 TALLOC_CTX *out_mem_ctx,
101 const DATA_BLOB in, DATA_BLOB *out)
103 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
104 uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
105 DATA_BLOB server_domain_blob;
106 DATA_BLOB challenge_blob;
107 DATA_BLOB target_info = data_blob(NULL, 0);
109 const char *chal_parse_string;
110 const char *auth_gen_string;
111 DATA_BLOB lm_response = data_blob(NULL, 0);
112 DATA_BLOB nt_response = data_blob(NULL, 0);
113 DATA_BLOB session_key = data_blob(NULL, 0);
114 DATA_BLOB lm_session_key = data_blob(NULL, 0);
115 DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
118 const char *user, *domain;
120 TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
122 return NT_STATUS_NO_MEMORY;
125 if (!msrpc_parse(mem_ctx,
126 lp_iconv_convenience(gensec_security->lp_ctx),
132 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
133 dump_data(2, in.data, in.length);
134 talloc_free(mem_ctx);
136 return NT_STATUS_INVALID_PARAMETER;
139 data_blob_free(&server_domain_blob);
141 DEBUG(3, ("Got challenge flags:\n"));
142 debug_ntlmssp_flags(chal_flags);
144 ntlmssp_handle_neg_flags(gensec_ntlmssp_state, chal_flags, gensec_ntlmssp_state->allow_lm_key);
146 if (gensec_ntlmssp_state->unicode) {
147 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
148 chal_parse_string = "CdUdbddB";
150 chal_parse_string = "CdUdbdd";
152 auth_gen_string = "CdBBUUUBd";
154 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
155 chal_parse_string = "CdAdbddB";
157 chal_parse_string = "CdAdbdd";
160 auth_gen_string = "CdBBAAABd";
163 if (!msrpc_parse(mem_ctx,
164 lp_iconv_convenience(gensec_security->lp_ctx),
165 &in, chal_parse_string,
173 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
174 dump_data(2, in.data, in.length);
175 talloc_free(mem_ctx);
176 return NT_STATUS_INVALID_PARAMETER;
179 gensec_ntlmssp_state->server_domain = server_domain;
181 if (challenge_blob.length != 8) {
182 talloc_free(mem_ctx);
183 return NT_STATUS_INVALID_PARAMETER;
186 cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx,
189 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
190 flags |= CLI_CRED_NTLM2;
192 if (gensec_ntlmssp_state->use_ntlmv2) {
193 flags |= CLI_CRED_NTLMv2_AUTH;
195 if (gensec_ntlmssp_state->use_nt_response) {
196 flags |= CLI_CRED_NTLM_AUTH;
198 if (lp_client_lanman_auth(gensec_security->lp_ctx)) {
199 flags |= CLI_CRED_LANMAN_AUTH;
202 nt_status = cli_credentials_get_ntlm_response(gensec_security->credentials, mem_ctx,
203 &flags, challenge_blob, target_info,
204 &lm_response, &nt_response,
205 &lm_session_key, &session_key);
207 if (!NT_STATUS_IS_OK(nt_status)) {
211 if (!(flags & CLI_CRED_LANMAN_AUTH)) {
212 /* LM Key is still possible, just silly. Fortunetly
213 * we require command line options to end up here */
214 /* gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; */
217 if (!(flags & CLI_CRED_NTLM2)) {
218 /* NTLM2 is incompatible... */
219 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
222 if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
223 && lp_client_lanman_auth(gensec_security->lp_ctx) && lm_session_key.length == 16) {
224 DATA_BLOB new_session_key = data_blob_talloc(mem_ctx, NULL, 16);
225 if (lm_response.length == 24) {
226 SMBsesskeygen_lm_sess_key(lm_session_key.data, lm_response.data,
227 new_session_key.data);
229 static const uint8_t zeros[24];
230 SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros,
231 new_session_key.data);
233 session_key = new_session_key;
234 dump_data_pw("LM session key\n", session_key.data, session_key.length);
238 /* Key exchange encryptes a new client-generated session key with
239 the password-derived key */
240 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
241 /* Make up a new session key */
242 uint8_t client_session_key[16];
243 generate_secret_buffer(client_session_key, sizeof(client_session_key));
245 /* Encrypt the new session key with the old one */
246 encrypted_session_key = data_blob_talloc(gensec_ntlmssp_state,
247 client_session_key, sizeof(client_session_key));
248 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
249 arcfour_crypt(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
250 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
252 /* Mark the new session key as the 'real' session key */
253 session_key = data_blob_talloc(mem_ctx, client_session_key, sizeof(client_session_key));
256 DEBUG(3, ("NTLMSSP: Set final flags:\n"));
257 debug_ntlmssp_flags(gensec_ntlmssp_state->neg_flags);
259 /* this generates the actual auth packet */
260 if (!msrpc_gen(mem_ctx,
261 lp_iconv_convenience(gensec_security->lp_ctx),
262 out, auth_gen_string,
265 lm_response.data, lm_response.length,
266 nt_response.data, nt_response.length,
269 cli_credentials_get_workstation(gensec_security->credentials),
270 encrypted_session_key.data, encrypted_session_key.length,
271 gensec_ntlmssp_state->neg_flags)) {
272 talloc_free(mem_ctx);
273 return NT_STATUS_NO_MEMORY;
276 gensec_ntlmssp_state->session_key = session_key;
277 talloc_steal(gensec_ntlmssp_state, session_key.data);
279 talloc_steal(out_mem_ctx, out->data);
281 gensec_ntlmssp_state->chal = challenge_blob;
282 gensec_ntlmssp_state->lm_resp = lm_response;
283 talloc_steal(gensec_ntlmssp_state->lm_resp.data, lm_response.data);
284 gensec_ntlmssp_state->nt_resp = nt_response;
285 talloc_steal(gensec_ntlmssp_state->nt_resp.data, nt_response.data);
287 gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
289 if (gensec_security->want_features & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL)) {
290 nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
291 if (!NT_STATUS_IS_OK(nt_status)) {
292 DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n",
293 nt_errstr(nt_status)));
294 talloc_free(mem_ctx);
299 talloc_free(mem_ctx);
303 NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_security)
305 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
308 nt_status = gensec_ntlmssp_start(gensec_security);
309 NT_STATUS_NOT_OK_RETURN(nt_status);
311 gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
313 gensec_ntlmssp_state->role = NTLMSSP_CLIENT;
315 gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->lp_ctx);
317 gensec_ntlmssp_state->unicode = lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_client", "unicode", true);
319 gensec_ntlmssp_state->use_nt_response = lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_client", "send_nt_reponse", true);
321 gensec_ntlmssp_state->allow_lm_key = (lp_client_lanman_auth(gensec_security->lp_ctx)
322 && (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_client", "allow_lm_key", false)
323 || lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_client", "lm_key", false)));
325 gensec_ntlmssp_state->use_ntlmv2 = lp_client_ntlmv2_auth(gensec_security->lp_ctx);
327 gensec_ntlmssp_state->expected_state = NTLMSSP_INITIAL;
329 gensec_ntlmssp_state->neg_flags =
330 NTLMSSP_NEGOTIATE_NTLM |
331 NTLMSSP_REQUEST_TARGET;
333 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_client", "128bit", true)) {
334 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
337 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_client", "56bit", false)) {
338 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
341 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_client", "lm_key", false)) {
342 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
345 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_client", "keyexchange", true)) {
346 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
349 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_client", "alwayssign", true)) {
350 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
353 if (lp_parm_bool(gensec_security->lp_ctx, NULL, "ntlmssp_client", "ntlm2", true)) {
354 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
356 /* apparently we can't do ntlmv2 if we don't do ntlm2 */
357 gensec_ntlmssp_state->use_ntlmv2 = false;
360 if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
362 * We need to set this to allow a later SetPassword
363 * via the SAMR pipe to succeed. Strange.... We could
364 * also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
366 * Without this, Windows will not create the master key
367 * that it thinks is only used for NTLMSSP signing and
368 * sealing. (It is actually pulled out and used directly)
370 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
372 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
373 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
375 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
376 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
379 gensec_security->private_data = gensec_ntlmssp_state;