auth: Move the rest of the source4 gensec_ntlmssp code to the top level
[ira/wip.git] / auth / ntlmssp / ntlmssp_client.c
1 /*
2    Unix SMB/Netbios implementation.
3    Version 3.0
4    handle NLTMSSP, client server side parsing
5
6    Copyright (C) Andrew Tridgell      2001
7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
8    Copyright (C) Stefan Metzmacher 2005
9
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.
14
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.
19
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/>.
22 */
23
24 struct auth_session_info;
25
26 #include "includes.h"
27 #include "auth/ntlmssp/ntlmssp.h"
28 #include "../lib/crypto/crypto.h"
29 #include "../libcli/auth/libcli_auth.h"
30 #include "auth/credentials/credentials.h"
31 #include "auth/gensec/gensec.h"
32 #include "param/param.h"
33 #include "auth/ntlmssp/ntlmssp_private.h"
34 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
35 #include "../auth/ntlmssp/ntlmssp_ndr.h"
36
37 /*********************************************************************
38  Client side NTLMSSP
39 *********************************************************************/
40
41 /**
42  * Next state function for the Initial packet
43  *
44  * @param ntlmssp_state NTLMSSP State
45  * @param out_mem_ctx The DATA_BLOB *out will be allocated on this context
46  * @param in A NULL data blob (input ignored)
47  * @param out The initial negotiate request to the server, as an talloc()ed DATA_BLOB, on out_mem_ctx
48  * @return Errors or NT_STATUS_OK.
49  */
50
51 NTSTATUS ntlmssp_client_initial(struct gensec_security *gensec_security,
52                                 TALLOC_CTX *out_mem_ctx,
53                                 DATA_BLOB in, DATA_BLOB *out)
54 {
55         struct gensec_ntlmssp_context *gensec_ntlmssp =
56                 talloc_get_type_abort(gensec_security->private_data,
57                                       struct gensec_ntlmssp_context);
58         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
59         const char *domain = ntlmssp_state->client.netbios_domain;
60         const char *workstation = ntlmssp_state->client.netbios_name;
61         NTSTATUS status;
62
63         /* These don't really matter in the initial packet, so don't panic if they are not set */
64         if (!domain) {
65                 domain = "";
66         }
67
68         if (!workstation) {
69                 workstation = "";
70         }
71
72         if (ntlmssp_state->unicode) {
73                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
74         } else {
75                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
76         }
77
78         if (ntlmssp_state->use_ntlmv2) {
79                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
80         }
81
82         /* generate the ntlmssp negotiate packet */
83         status = msrpc_gen(out_mem_ctx,
84                   out, "CddAA",
85                   "NTLMSSP",
86                   NTLMSSP_NEGOTIATE,
87                   ntlmssp_state->neg_flags,
88                   domain,
89                   workstation);
90
91         if (!NT_STATUS_IS_OK(status)) {
92                 DEBUG(0, ("ntlmssp_client_initial: failed to generate "
93                           "ntlmssp negotiate packet\n"));
94                 return status;
95         }
96
97         if (DEBUGLEVEL >= 10) {
98                 struct NEGOTIATE_MESSAGE *negotiate = talloc(
99                         talloc_tos(), struct NEGOTIATE_MESSAGE);
100                 if (negotiate != NULL) {
101                         status = ntlmssp_pull_NEGOTIATE_MESSAGE(
102                                 out, negotiate, negotiate);
103                         if (NT_STATUS_IS_OK(status)) {
104                                 NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
105                                                 negotiate);
106                         }
107                         TALLOC_FREE(negotiate);
108                 }
109         }
110
111         ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
112
113         return NT_STATUS_MORE_PROCESSING_REQUIRED;
114 }
115
116 /**
117  * Next state function for the Challenge Packet.  Generate an auth packet.
118  *
119  * @param gensec_security GENSEC state
120  * @param out_mem_ctx Memory context for *out
121  * @param in The server challnege, as a DATA_BLOB.  reply.data must be NULL
122  * @param out The next request (auth packet) to the server, as an allocated DATA_BLOB, on the out_mem_ctx context
123  * @return Errors or NT_STATUS_OK.
124  */
125
126 NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security,
127                                   TALLOC_CTX *out_mem_ctx,
128                                   const DATA_BLOB in, DATA_BLOB *out)
129 {
130         struct gensec_ntlmssp_context *gensec_ntlmssp =
131                 talloc_get_type_abort(gensec_security->private_data,
132                                       struct gensec_ntlmssp_context);
133         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
134         uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
135         DATA_BLOB server_domain_blob;
136         DATA_BLOB challenge_blob;
137         DATA_BLOB target_info = data_blob(NULL, 0);
138         char *server_domain;
139         const char *chal_parse_string;
140         const char *auth_gen_string;
141         DATA_BLOB lm_response = data_blob(NULL, 0);
142         DATA_BLOB nt_response = data_blob(NULL, 0);
143         DATA_BLOB session_key = data_blob(NULL, 0);
144         DATA_BLOB lm_session_key = data_blob(NULL, 0);
145         DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
146         NTSTATUS nt_status;
147         int flags = 0;
148         const char *user, *domain;
149
150         TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
151         if (!mem_ctx) {
152                 return NT_STATUS_NO_MEMORY;
153         }
154
155         if (!msrpc_parse(mem_ctx,
156                          &in, "CdBd",
157                          "NTLMSSP",
158                          &ntlmssp_command,
159                          &server_domain_blob,
160                          &chal_flags)) {
161                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
162                 dump_data(2, in.data, in.length);
163                 talloc_free(mem_ctx);
164
165                 return NT_STATUS_INVALID_PARAMETER;
166         }
167
168         data_blob_free(&server_domain_blob);
169
170         DEBUG(3, ("Got challenge flags:\n"));
171         debug_ntlmssp_flags(chal_flags);
172
173         ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, ntlmssp_state->allow_lm_key);
174
175         if (ntlmssp_state->unicode) {
176                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
177                         chal_parse_string = "CdUdbddB";
178                 } else {
179                         chal_parse_string = "CdUdbdd";
180                 }
181                 auth_gen_string = "CdBBUUUBd";
182         } else {
183                 if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
184                         chal_parse_string = "CdAdbddB";
185                 } else {
186                         chal_parse_string = "CdAdbdd";
187                 }
188
189                 auth_gen_string = "CdBBAAABd";
190         }
191
192         if (!msrpc_parse(mem_ctx,
193                          &in, chal_parse_string,
194                          "NTLMSSP",
195                          &ntlmssp_command,
196                          &server_domain,
197                          &chal_flags,
198                          &challenge_blob, 8,
199                          &unkn1, &unkn2,
200                          &target_info)) {
201                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
202                 dump_data(2, in.data, in.length);
203                 talloc_free(mem_ctx);
204                 return NT_STATUS_INVALID_PARAMETER;
205         }
206
207         if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
208                 ntlmssp_state->server.is_standalone = true;
209         } else {
210                 ntlmssp_state->server.is_standalone = false;
211         }
212         /* TODO: parse struct_blob and fill in the rest */
213         ntlmssp_state->server.netbios_name = "";
214         ntlmssp_state->server.netbios_domain = server_domain;
215         ntlmssp_state->server.dns_name = "";
216         ntlmssp_state->server.dns_domain = "";
217
218         if (challenge_blob.length != 8) {
219                 talloc_free(mem_ctx);
220                 return NT_STATUS_INVALID_PARAMETER;
221         }
222
223         cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx,
224                                                  &user, &domain);
225
226         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
227                 flags |= CLI_CRED_NTLM2;
228         }
229         if (ntlmssp_state->use_ntlmv2) {
230                 flags |= CLI_CRED_NTLMv2_AUTH;
231         }
232         if (ntlmssp_state->use_nt_response) {
233                 flags |= CLI_CRED_NTLM_AUTH;
234         }
235         if (lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx)) {
236                 flags |= CLI_CRED_LANMAN_AUTH;
237         }
238
239         nt_status = cli_credentials_get_ntlm_response(gensec_security->credentials, mem_ctx,
240                                                       &flags, challenge_blob, target_info,
241                                                       &lm_response, &nt_response,
242                                                       &lm_session_key, &session_key);
243
244         if (!NT_STATUS_IS_OK(nt_status)) {
245                 return nt_status;
246         }
247
248         if (!(flags & CLI_CRED_LANMAN_AUTH)) {
249                 /* LM Key is still possible, just silly, so we do not
250                  * allow it. Fortunetly all LM crypto is off by
251                  * default and we require command line options to end
252                  * up here */
253                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
254         }
255
256         if (!(flags & CLI_CRED_NTLM2)) {
257                 /* NTLM2 is incompatible... */
258                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
259         }
260
261         if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
262             && lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx) && lm_session_key.length == 16) {
263                 DATA_BLOB new_session_key = data_blob_talloc(mem_ctx, NULL, 16);
264                 if (lm_response.length == 24) {
265                         SMBsesskeygen_lm_sess_key(lm_session_key.data, lm_response.data,
266                                                   new_session_key.data);
267                 } else {
268                         static const uint8_t zeros[24];
269                         SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros,
270                                                   new_session_key.data);
271                 }
272                 session_key = new_session_key;
273                 dump_data_pw("LM session key\n", session_key.data, session_key.length);
274         }
275
276
277         /* Key exchange encryptes a new client-generated session key with
278            the password-derived key */
279         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
280                 /* Make up a new session key */
281                 uint8_t client_session_key[16];
282                 generate_secret_buffer(client_session_key, sizeof(client_session_key));
283
284                 /* Encrypt the new session key with the old one */
285                 encrypted_session_key = data_blob_talloc(ntlmssp_state,
286                                                          client_session_key, sizeof(client_session_key));
287                 dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
288                 arcfour_crypt(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
289                 dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
290
291                 /* Mark the new session key as the 'real' session key */
292                 session_key = data_blob_talloc(mem_ctx, client_session_key, sizeof(client_session_key));
293         }
294
295         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
296         debug_ntlmssp_flags(ntlmssp_state->neg_flags);
297
298         /* this generates the actual auth packet */
299         nt_status = msrpc_gen(mem_ctx,
300                        out, auth_gen_string,
301                        "NTLMSSP",
302                        NTLMSSP_AUTH,
303                        lm_response.data, lm_response.length,
304                        nt_response.data, nt_response.length,
305                        domain,
306                        user,
307                        cli_credentials_get_workstation(gensec_security->credentials),
308                        encrypted_session_key.data, encrypted_session_key.length,
309                        ntlmssp_state->neg_flags);
310         if (!NT_STATUS_IS_OK(nt_status)) {
311                 talloc_free(mem_ctx);
312                 return nt_status;
313         }
314
315         ntlmssp_state->session_key = session_key;
316         talloc_steal(ntlmssp_state, session_key.data);
317
318         talloc_steal(out_mem_ctx, out->data);
319
320         ntlmssp_state->chal = challenge_blob;
321         ntlmssp_state->lm_resp = lm_response;
322         talloc_steal(ntlmssp_state->lm_resp.data, lm_response.data);
323         ntlmssp_state->nt_resp = nt_response;
324         talloc_steal(ntlmssp_state->nt_resp.data, nt_response.data);
325
326         ntlmssp_state->expected_state = NTLMSSP_DONE;
327
328         if (gensec_security->want_features & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL)) {
329                 nt_status = ntlmssp_sign_init(ntlmssp_state);
330                 if (!NT_STATUS_IS_OK(nt_status)) {
331                         DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n",
332                                   nt_errstr(nt_status)));
333                         talloc_free(mem_ctx);
334                         return nt_status;
335                 }
336         }
337
338         talloc_free(mem_ctx);
339         return NT_STATUS_OK;
340 }
341
342 NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_security)
343 {
344         struct gensec_ntlmssp_context *gensec_ntlmssp;
345         struct ntlmssp_state *ntlmssp_state;
346         NTSTATUS nt_status;
347
348         nt_status = gensec_ntlmssp_start(gensec_security);
349         NT_STATUS_NOT_OK_RETURN(nt_status);
350
351         gensec_ntlmssp =
352                 talloc_get_type_abort(gensec_security->private_data,
353                                       struct gensec_ntlmssp_context);
354
355         ntlmssp_state = talloc_zero(gensec_ntlmssp,
356                                     struct ntlmssp_state);
357         if (!ntlmssp_state) {
358                 return NT_STATUS_NO_MEMORY;
359         }
360
361         ntlmssp_state->callback_private = gensec_ntlmssp;
362
363         gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
364
365         ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
366
367         ntlmssp_state->role = NTLMSSP_CLIENT;
368
369         ntlmssp_state->client.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
370         ntlmssp_state->client.netbios_name = cli_credentials_get_workstation(gensec_security->credentials);
371
372         ntlmssp_state->unicode = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "unicode", true);
373
374         ntlmssp_state->use_nt_response = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "send_nt_reponse", true);
375
376         ntlmssp_state->allow_lm_key = (lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx)
377                                               && (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "allow_lm_key", false)
378                                                   || gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)));
379
380         ntlmssp_state->use_ntlmv2 = lpcfg_client_ntlmv2_auth(gensec_security->settings->lp_ctx);
381
382         ntlmssp_state->expected_state = NTLMSSP_INITIAL;
383
384         ntlmssp_state->neg_flags =
385                 NTLMSSP_NEGOTIATE_NTLM |
386                 NTLMSSP_REQUEST_TARGET;
387
388         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "128bit", true)) {
389                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
390         }
391
392         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "56bit", false)) {
393                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
394         }
395
396         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)) {
397                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
398         }
399
400         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "keyexchange", true)) {
401                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
402         }
403
404         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "alwayssign", true)) {
405                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
406         }
407
408         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "ntlm2", true)) {
409                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
410         } else {
411                 /* apparently we can't do ntlmv2 if we don't do ntlm2 */
412                 ntlmssp_state->use_ntlmv2 = false;
413         }
414
415         if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
416                 /*
417                  * We need to set this to allow a later SetPassword
418                  * via the SAMR pipe to succeed. Strange.... We could
419                  * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
420                  *
421                  * Without this, Windows will not create the master key
422                  * that it thinks is only used for NTLMSSP signing and
423                  * sealing.  (It is actually pulled out and used directly)
424                  */
425                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
426         }
427         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
428                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
429         }
430         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
431                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
432                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
433         }
434
435         return NT_STATUS_OK;
436 }