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 <tevent.h>
28 #include "lib/util/tevent_ntstatus.h"
29 #include "auth/ntlmssp/ntlmssp.h"
30 #include "auth/ntlmssp/ntlmssp_private.h"
31 #include "../libcli/auth/libcli_auth.h"
32 #include "librpc/gen_ndr/ndr_dcerpc.h"
33 #include "auth/gensec/gensec.h"
34 #include "auth/gensec/gensec_internal.h"
35
36 #undef DBGC_CLASS
37 #define DBGC_CLASS DBGC_AUTH
38
39 /**
40 * Callbacks for NTLMSSP - for both client and server operating modes
41 *
42 */
43
44 static const struct ntlmssp_callbacks {
45 enum ntlmssp_role role;
46 enum ntlmssp_message_type command;
47 NTSTATUS (*sync_fn)(struct gensec_security *gensec_security,
48 TALLOC_CTX *out_mem_ctx,
49 DATA_BLOB in, DATA_BLOB *out);
50 struct tevent_req *(*send_fn)(TALLOC_CTX *mem_ctx,
51 struct tevent_context *ev,
52 struct gensec_security *gensec_security,
53 const DATA_BLOB in);
54 NTSTATUS (*recv_fn)(struct tevent_req *req,
55 TALLOC_CTX *out_mem_ctx,
56 DATA_BLOB *out);
57 } ntlmssp_callbacks[] = {
58 {
59 .role = NTLMSSP_CLIENT,
60 .command = NTLMSSP_INITIAL,
61 .sync_fn = ntlmssp_client_initial,
62 },{
63 .role = NTLMSSP_CLIENT,
64 .command = NTLMSSP_NEGOTIATE,
65 .sync_fn = gensec_ntlmssp_resume_ccache,
66 },{
67 .role = NTLMSSP_SERVER,
68 .command = NTLMSSP_NEGOTIATE,
69 .sync_fn = gensec_ntlmssp_server_negotiate,
70 },{
71 .role = NTLMSSP_CLIENT,
72 .command = NTLMSSP_CHALLENGE,
73 .sync_fn = ntlmssp_client_challenge,
74 },{
75 .role = NTLMSSP_SERVER,
76 .command = NTLMSSP_AUTH,
77 .send_fn = ntlmssp_server_auth_send,
78 .recv_fn = ntlmssp_server_auth_recv,
79 }
80 };
81
82
gensec_ntlmssp_update_find(struct gensec_security * gensec_security,struct gensec_ntlmssp_context * gensec_ntlmssp,const DATA_BLOB input,uint32_t * idx)83 static NTSTATUS gensec_ntlmssp_update_find(struct gensec_security *gensec_security,
84 struct gensec_ntlmssp_context *gensec_ntlmssp,
85 const DATA_BLOB input, uint32_t *idx)
86 {
87 uint32_t ntlmssp_command;
88 uint32_t i;
89
90 if (gensec_ntlmssp->ntlmssp_state->expected_state == NTLMSSP_DONE) {
91 /* We are strict here because other modules, which we
92 * don't fully control (such as GSSAPI) are also
93 * strict, but are tested less often */
94
95 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
96 return NT_STATUS_INVALID_PARAMETER;
97 }
98
99 if (!input.length) {
100 switch (gensec_ntlmssp->ntlmssp_state->role) {
101 case NTLMSSP_CLIENT:
102 if (gensec_ntlmssp->ntlmssp_state->resume_ccache) {
103 /*
104 * make sure gensec_ntlmssp_resume_ccache()
105 * will be called
106 */
107 ntlmssp_command = NTLMSSP_NEGOTIATE;
108 break;
109 }
110
111 ntlmssp_command = NTLMSSP_INITIAL;
112 break;
113 case NTLMSSP_SERVER:
114 if (gensec_security->want_features & GENSEC_FEATURE_DATAGRAM_MODE) {
115 /* 'datagram' mode - no neg packet */
116 ntlmssp_command = NTLMSSP_NEGOTIATE;
117 } else {
118 /* This is normal in SPNEGO mech negotiation fallback */
119 DEBUG(2, ("Failed to parse NTLMSSP packet: zero length\n"));
120 return NT_STATUS_INVALID_PARAMETER;
121 }
122 break;
123 default:
124 DEBUG(1, ("NTLMSSP state has invalid role %d\n",
125 gensec_ntlmssp->ntlmssp_state->role));
126 return NT_STATUS_INVALID_PARAMETER;
127 }
128 } else {
129 if (!msrpc_parse(gensec_ntlmssp->ntlmssp_state,
130 &input, "Cd",
131 "NTLMSSP",
132 &ntlmssp_command)) {
133 DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
134 dump_data(2, input.data, input.length);
135 return NT_STATUS_INVALID_PARAMETER;
136 }
137 }
138
139 if (ntlmssp_command != gensec_ntlmssp->ntlmssp_state->expected_state) {
140 DEBUG(2, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command,
141 gensec_ntlmssp->ntlmssp_state->expected_state));
142 return NT_STATUS_INVALID_PARAMETER;
143 }
144
145 for (i=0; i < ARRAY_SIZE(ntlmssp_callbacks); i++) {
146 if (ntlmssp_callbacks[i].role == gensec_ntlmssp->ntlmssp_state->role &&
147 ntlmssp_callbacks[i].command == ntlmssp_command) {
148 *idx = i;
149 return NT_STATUS_OK;
150 }
151 }
152
153 DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
154 gensec_ntlmssp->ntlmssp_state->role, ntlmssp_command));
155
156 return NT_STATUS_INVALID_PARAMETER;
157 }
158
159 struct gensec_ntlmssp_update_state {
160 const struct ntlmssp_callbacks *cb;
161 NTSTATUS status;
162 DATA_BLOB out;
163 };
164
165 static void gensec_ntlmssp_update_done(struct tevent_req *subreq);
166
gensec_ntlmssp_update_send(TALLOC_CTX * mem_ctx,struct tevent_context * ev,struct gensec_security * gensec_security,const DATA_BLOB in)167 static struct tevent_req *gensec_ntlmssp_update_send(TALLOC_CTX *mem_ctx,
168 struct tevent_context *ev,
169 struct gensec_security *gensec_security,
170 const DATA_BLOB in)
171 {
172 struct gensec_ntlmssp_context *gensec_ntlmssp =
173 talloc_get_type_abort(gensec_security->private_data,
174 struct gensec_ntlmssp_context);
175 struct tevent_req *req = NULL;
176 struct gensec_ntlmssp_update_state *state = NULL;
177 NTSTATUS status;
178 uint32_t i = 0;
179
180 req = tevent_req_create(mem_ctx, &state,
181 struct gensec_ntlmssp_update_state);
182 if (req == NULL) {
183 return NULL;
184 }
185
186 status = gensec_ntlmssp_update_find(gensec_security,
187 gensec_ntlmssp,
188 in, &i);
189 if (tevent_req_nterror(req, status)) {
190 return tevent_req_post(req, ev);
191 }
192
193 if (ntlmssp_callbacks[i].send_fn != NULL) {
194 struct tevent_req *subreq = NULL;
195
196 state->cb = &ntlmssp_callbacks[i];
197
198 subreq = state->cb->send_fn(state, ev,
199 gensec_security,
200 in);
201 if (tevent_req_nomem(subreq, req)) {
202 return tevent_req_post(req, ev);
203 }
204 tevent_req_set_callback(subreq,
205 gensec_ntlmssp_update_done,
206 req);
207 return req;
208 }
209
210 status = ntlmssp_callbacks[i].sync_fn(gensec_security,
211 state,
212 in, &state->out);
213 state->status = status;
214 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
215 tevent_req_done(req);
216 return tevent_req_post(req, ev);
217 }
218 if (tevent_req_nterror(req, status)) {
219 return tevent_req_post(req, ev);
220 }
221
222 tevent_req_done(req);
223 return tevent_req_post(req, ev);
224 }
225
gensec_ntlmssp_update_done(struct tevent_req * subreq)226 static void gensec_ntlmssp_update_done(struct tevent_req *subreq)
227 {
228 struct tevent_req *req =
229 tevent_req_callback_data(subreq,
230 struct tevent_req);
231 struct gensec_ntlmssp_update_state *state =
232 tevent_req_data(req,
233 struct gensec_ntlmssp_update_state);
234 NTSTATUS status;
235
236 status = state->cb->recv_fn(subreq, state, &state->out);
237 TALLOC_FREE(subreq);
238 if (GENSEC_UPDATE_IS_NTERROR(status)) {
239 tevent_req_nterror(req, status);
240 return;
241 }
242
243 state->status = status;
244 tevent_req_done(req);
245 }
246
gensec_ntlmssp_update_recv(struct tevent_req * req,TALLOC_CTX * out_mem_ctx,DATA_BLOB * out)247 static NTSTATUS gensec_ntlmssp_update_recv(struct tevent_req *req,
248 TALLOC_CTX *out_mem_ctx,
249 DATA_BLOB *out)
250 {
251 struct gensec_ntlmssp_update_state *state =
252 tevent_req_data(req,
253 struct gensec_ntlmssp_update_state);
254 NTSTATUS status;
255
256 *out = data_blob_null;
257
258 if (tevent_req_is_nterror(req, &status)) {
259 tevent_req_received(req);
260 return status;
261 }
262
263 *out = state->out;
264 talloc_steal(out_mem_ctx, state->out.data);
265 status = state->status;
266 tevent_req_received(req);
267 return status;
268 }
269
gensec_ntlmssp_may_reset_crypto(struct gensec_security * gensec_security,bool full_reset)270 static NTSTATUS gensec_ntlmssp_may_reset_crypto(struct gensec_security *gensec_security,
271 bool full_reset)
272 {
273 struct gensec_ntlmssp_context *gensec_ntlmssp =
274 talloc_get_type_abort(gensec_security->private_data,
275 struct gensec_ntlmssp_context);
276 struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
277 NTSTATUS status;
278 bool reset_seqnums = full_reset;
279
280 if (!gensec_ntlmssp_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
281 return NT_STATUS_OK;
282 }
283
284 status = ntlmssp_sign_reset(ntlmssp_state, reset_seqnums);
285 if (!NT_STATUS_IS_OK(status)) {
286 DEBUG(1, ("Could not reset NTLMSSP signing/sealing system (error was: %s)\n",
287 nt_errstr(status)));
288 return status;
289 }
290
291 return NT_STATUS_OK;
292 }
293
gensec_ntlmssp_final_auth_type(struct gensec_security * gensec_security)294 static const char *gensec_ntlmssp_final_auth_type(struct gensec_security *gensec_security)
295 {
296 return GENSEC_FINAL_AUTH_TYPE_NTLMSSP;
297 }
298
299 static const char *gensec_ntlmssp_oids[] = {
300 GENSEC_OID_NTLMSSP,
301 NULL
302 };
303
304 static const struct gensec_security_ops gensec_ntlmssp_security_ops = {
305 .name = "ntlmssp",
306 .sasl_name = GENSEC_SASL_NAME_NTLMSSP, /* "NTLM" */
307 .auth_type = DCERPC_AUTH_TYPE_NTLMSSP,
308 .oid = gensec_ntlmssp_oids,
309 .client_start = gensec_ntlmssp_client_start,
310 .server_start = gensec_ntlmssp_server_start,
311 .magic = gensec_ntlmssp_magic,
312 .update_send = gensec_ntlmssp_update_send,
313 .update_recv = gensec_ntlmssp_update_recv,
314 .may_reset_crypto= gensec_ntlmssp_may_reset_crypto,
315 .sig_size = gensec_ntlmssp_sig_size,
316 .sign_packet = gensec_ntlmssp_sign_packet,
317 .check_packet = gensec_ntlmssp_check_packet,
318 .seal_packet = gensec_ntlmssp_seal_packet,
319 .unseal_packet = gensec_ntlmssp_unseal_packet,
320 .wrap = gensec_ntlmssp_wrap,
321 .unwrap = gensec_ntlmssp_unwrap,
322 .session_key = gensec_ntlmssp_session_key,
323 .session_info = gensec_ntlmssp_session_info,
324 .have_feature = gensec_ntlmssp_have_feature,
325 .final_auth_type = gensec_ntlmssp_final_auth_type,
326 .enabled = true,
327 .priority = GENSEC_NTLMSSP
328 };
329
330 static const struct gensec_security_ops gensec_ntlmssp_resume_ccache_ops = {
331 .name = "ntlmssp_resume_ccache",
332 .client_start = gensec_ntlmssp_resume_ccache_start,
333 .update_send = gensec_ntlmssp_update_send,
334 .update_recv = gensec_ntlmssp_update_recv,
335 .session_key = gensec_ntlmssp_session_key,
336 .have_feature = gensec_ntlmssp_have_feature,
337 .enabled = true,
338 .priority = GENSEC_NTLMSSP
339 };
340
gensec_ntlmssp_init(TALLOC_CTX * ctx)341 _PUBLIC_ NTSTATUS gensec_ntlmssp_init(TALLOC_CTX *ctx)
342 {
343 NTSTATUS ret;
344
345 ret = gensec_register(ctx, &gensec_ntlmssp_security_ops);
346 if (!NT_STATUS_IS_OK(ret)) {
347 DEBUG(0,("Failed to register '%s' gensec backend!\n",
348 gensec_ntlmssp_security_ops.name));
349 return ret;
350 }
351
352 ret = gensec_register(ctx, &gensec_ntlmssp_resume_ccache_ops);
353 if (!NT_STATUS_IS_OK(ret)) {
354 DEBUG(0,("Failed to register '%s' gensec backend!\n",
355 gensec_ntlmssp_resume_ccache_ops.name));
356 return ret;
357 }
358
359 return ret;
360 }
361
gensec_find_child_by_ops(struct gensec_security * gensec_security,const struct gensec_security_ops * ops)362 static struct gensec_security *gensec_find_child_by_ops(struct gensec_security *gensec_security,
363 const struct gensec_security_ops *ops)
364 {
365 struct gensec_security *current = gensec_security;
366
367 while (current != NULL) {
368 if (current->ops == ops) {
369 return current;
370 }
371
372 current = current->child_security;
373 }
374
375 return NULL;
376 }
377
gensec_ntlmssp_neg_flags(struct gensec_security * gensec_security)378 uint32_t gensec_ntlmssp_neg_flags(struct gensec_security *gensec_security)
379 {
380 struct gensec_ntlmssp_context *gensec_ntlmssp;
381
382 gensec_security = gensec_find_child_by_ops(gensec_security,
383 &gensec_ntlmssp_security_ops);
384 if (gensec_security == NULL) {
385 return 0;
386 }
387
388 gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
389 struct gensec_ntlmssp_context);
390 return gensec_ntlmssp->ntlmssp_state->neg_flags;
391 }
392
gensec_ntlmssp_server_domain(struct gensec_security * gensec_security)393 const char *gensec_ntlmssp_server_domain(struct gensec_security *gensec_security)
394 {
395 struct gensec_ntlmssp_context *gensec_ntlmssp;
396
397 gensec_security = gensec_find_child_by_ops(gensec_security,
398 &gensec_ntlmssp_security_ops);
399 if (gensec_security == NULL) {
400 return NULL;
401 }
402
403 gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
404 struct gensec_ntlmssp_context);
405 return gensec_ntlmssp->ntlmssp_state->server.netbios_domain;
406 }
407