Fix Samba4 build errors with common libcli/samsync
[ira/wip.git] / source4 / 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 #include "includes.h"
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"
31
32 /*********************************************************************
33  Client side NTLMSSP
34 *********************************************************************/
35
36 /**
37  * Next state function for the Initial packet
38  * 
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. 
44  */
45
46 NTSTATUS ntlmssp_client_initial(struct gensec_security *gensec_security, 
47                                 TALLOC_CTX *out_mem_ctx, 
48                                 DATA_BLOB in, DATA_BLOB *out) 
49 {
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);
53
54         /* These don't really matter in the initial packet, so don't panic if they are not set */
55         if (!domain) {
56                 domain = "";
57         }
58
59         if (!workstation) {
60                 workstation = "";
61         }
62
63         if (gensec_ntlmssp_state->unicode) {
64                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
65         } else {
66                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
67         }
68         
69         if (gensec_ntlmssp_state->use_ntlmv2) {
70                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
71         }
72
73         /* generate the ntlmssp negotiate packet */
74         msrpc_gen(out_mem_ctx, 
75                   out, "CddAA",
76                   "NTLMSSP",
77                   NTLMSSP_NEGOTIATE,
78                   gensec_ntlmssp_state->neg_flags,
79                   domain, 
80                   workstation);
81
82         gensec_ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
83
84         return NT_STATUS_MORE_PROCESSING_REQUIRED;
85 }
86
87 /**
88  * Next state function for the Challenge Packet.  Generate an auth packet.
89  * 
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. 
95  */
96
97 NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security, 
98                                   TALLOC_CTX *out_mem_ctx,
99                                   const DATA_BLOB in, DATA_BLOB *out) 
100 {
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);
106         char *server_domain;
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);
114         NTSTATUS nt_status;
115         int flags = 0;
116         const char *user, *domain;
117
118         TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
119         if (!mem_ctx) {
120                 return NT_STATUS_NO_MEMORY;
121         }
122
123         if (!msrpc_parse(mem_ctx,
124                          &in, "CdBd",
125                          "NTLMSSP",
126                          &ntlmssp_command, 
127                          &server_domain_blob,
128                          &chal_flags)) {
129                 DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
130                 dump_data(2, in.data, in.length);
131                 talloc_free(mem_ctx);
132
133                 return NT_STATUS_INVALID_PARAMETER;
134         }
135         
136         data_blob_free(&server_domain_blob);
137
138         DEBUG(3, ("Got challenge flags:\n"));
139         debug_ntlmssp_flags(chal_flags);
140
141         ntlmssp_handle_neg_flags(gensec_ntlmssp_state, chal_flags, gensec_ntlmssp_state->allow_lm_key);
142
143         if (gensec_ntlmssp_state->unicode) {
144                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
145                         chal_parse_string = "CdUdbddB";
146                 } else {
147                         chal_parse_string = "CdUdbdd";
148                 }
149                 auth_gen_string = "CdBBUUUBd";
150         } else {
151                 if (chal_flags & NTLMSSP_CHAL_TARGET_INFO) {
152                         chal_parse_string = "CdAdbddB";
153                 } else {
154                         chal_parse_string = "CdAdbdd";
155                 }
156
157                 auth_gen_string = "CdBBAAABd";
158         }
159
160         if (!msrpc_parse(mem_ctx,
161                          &in, chal_parse_string,
162                          "NTLMSSP",
163                          &ntlmssp_command, 
164                          &server_domain,
165                          &chal_flags,
166                          &challenge_blob, 8,
167                          &unkn1, &unkn2,
168                          &target_info)) {
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;
173         }
174
175         gensec_ntlmssp_state->server_domain = server_domain;
176
177         if (challenge_blob.length != 8) {
178                 talloc_free(mem_ctx);
179                 return NT_STATUS_INVALID_PARAMETER;
180         }
181
182         cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx, 
183                                                  &user, &domain);
184
185         if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
186                 flags |= CLI_CRED_NTLM2;
187         }
188         if (gensec_ntlmssp_state->use_ntlmv2) {
189                 flags |= CLI_CRED_NTLMv2_AUTH;
190         }
191         if (gensec_ntlmssp_state->use_nt_response) {
192                 flags |= CLI_CRED_NTLM_AUTH;
193         }
194         if (lp_client_lanman_auth(gensec_security->settings->lp_ctx)) {
195                 flags |= CLI_CRED_LANMAN_AUTH;
196         }
197
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);
202
203         if (!NT_STATUS_IS_OK(nt_status)) {
204                 return nt_status;
205         }
206         
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; */
211         }
212
213         if (!(flags & CLI_CRED_NTLM2)) {
214                 /* NTLM2 is incompatible... */
215                 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
216         }
217         
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);
224                 } else {
225                         static const uint8_t zeros[24];
226                         SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros,
227                                                   new_session_key.data);
228                 }
229                 session_key = new_session_key;
230                 dump_data_pw("LM session key\n", session_key.data, session_key.length);
231         }
232
233
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));
240
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);
247
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));
250         }
251
252         DEBUG(3, ("NTLMSSP: Set final flags:\n"));
253         debug_ntlmssp_flags(gensec_ntlmssp_state->neg_flags);
254
255         /* this generates the actual auth packet */
256         if (!msrpc_gen(mem_ctx, 
257                        out, auth_gen_string, 
258                        "NTLMSSP", 
259                        NTLMSSP_AUTH, 
260                        lm_response.data, lm_response.length,
261                        nt_response.data, nt_response.length,
262                        domain, 
263                        user, 
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;
269         }
270
271         gensec_ntlmssp_state->session_key = session_key;
272         talloc_steal(gensec_ntlmssp_state, session_key.data);
273
274         talloc_steal(out_mem_ctx, out->data);
275
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);
281
282         gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;
283
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);
290                         return nt_status;
291                 }
292         }
293
294         talloc_free(mem_ctx);
295         return NT_STATUS_OK;
296 }
297
298 NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_security)
299 {
300         struct gensec_ntlmssp_state *gensec_ntlmssp_state;
301         NTSTATUS nt_status;
302
303         nt_status = gensec_ntlmssp_start(gensec_security);
304         NT_STATUS_NOT_OK_RETURN(nt_status);
305
306         gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
307
308         gensec_ntlmssp_state->role = NTLMSSP_CLIENT;
309
310         gensec_ntlmssp_state->domain = lp_workgroup(gensec_security->settings->lp_ctx);
311
312         gensec_ntlmssp_state->unicode = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "unicode", true);
313
314         gensec_ntlmssp_state->use_nt_response = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "send_nt_reponse", true);
315
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)));
319
320         gensec_ntlmssp_state->use_ntlmv2 = lp_client_ntlmv2_auth(gensec_security->settings->lp_ctx);
321
322         gensec_ntlmssp_state->expected_state = NTLMSSP_INITIAL;
323
324         gensec_ntlmssp_state->neg_flags = 
325                 NTLMSSP_NEGOTIATE_NTLM |
326                 NTLMSSP_REQUEST_TARGET;
327
328         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "128bit", true)) {
329                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;               
330         }
331
332         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "56bit", false)) {
333                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;                
334         }
335
336         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)) {
337                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
338         }
339
340         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "keyexchange", true)) {
341                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;          
342         }
343
344         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "alwayssign", true)) {
345                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;               
346         }
347
348         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "ntlm2", true)) {
349                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;             
350         } else {
351                 /* apparently we can't do ntlmv2 if we don't do ntlm2 */
352                 gensec_ntlmssp_state->use_ntlmv2 = false;
353         }
354
355         if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
356                 /*
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.
360                  * 
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) 
364                  */
365                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
366         }
367         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
368                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
369         }
370         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
371                 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
372         }
373
374         gensec_security->private_data = gensec_ntlmssp_state;
375
376         return NT_STATUS_OK;
377 }
378