Line data Source code
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 :
83 151245 : 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 : {
87 740 : uint32_t ntlmssp_command;
88 740 : uint32_t i;
89 :
90 151245 : 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 0 : DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
96 0 : return NT_STATUS_INVALID_PARAMETER;
97 : }
98 :
99 151245 : if (!input.length) {
100 38666 : switch (gensec_ntlmssp->ntlmssp_state->role) {
101 38666 : case NTLMSSP_CLIENT:
102 38666 : if (gensec_ntlmssp->ntlmssp_state->resume_ccache) {
103 : /*
104 : * make sure gensec_ntlmssp_resume_ccache()
105 : * will be called
106 : */
107 0 : ntlmssp_command = NTLMSSP_NEGOTIATE;
108 38370 : break;
109 : }
110 :
111 38666 : ntlmssp_command = NTLMSSP_INITIAL;
112 38666 : break;
113 0 : case NTLMSSP_SERVER:
114 0 : if (gensec_security->want_features & GENSEC_FEATURE_DATAGRAM_MODE) {
115 : /* 'datagram' mode - no neg packet */
116 0 : ntlmssp_command = NTLMSSP_NEGOTIATE;
117 : } else {
118 : /* This is normal in SPNEGO mech negotiation fallback */
119 0 : DEBUG(2, ("Failed to parse NTLMSSP packet: zero length\n"));
120 0 : return NT_STATUS_INVALID_PARAMETER;
121 : }
122 0 : break;
123 0 : default:
124 0 : DEBUG(1, ("NTLMSSP state has invalid role %d\n",
125 : gensec_ntlmssp->ntlmssp_state->role));
126 0 : return NT_STATUS_INVALID_PARAMETER;
127 : }
128 : } else {
129 112579 : if (!msrpc_parse(gensec_ntlmssp->ntlmssp_state,
130 : &input, "Cd",
131 : "NTLMSSP",
132 : &ntlmssp_command)) {
133 0 : DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
134 0 : dump_data(2, input.data, input.length);
135 0 : return NT_STATUS_INVALID_PARAMETER;
136 : }
137 : }
138 :
139 151245 : if (ntlmssp_command != gensec_ntlmssp->ntlmssp_state->expected_state) {
140 0 : DEBUG(2, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command,
141 : gensec_ntlmssp->ntlmssp_state->expected_state));
142 0 : return NT_STATUS_INVALID_PARAMETER;
143 : }
144 :
145 488755 : for (i=0; i < ARRAY_SIZE(ntlmssp_callbacks); i++) {
146 488755 : if (ntlmssp_callbacks[i].role == gensec_ntlmssp->ntlmssp_state->role &&
147 264127 : ntlmssp_callbacks[i].command == ntlmssp_command) {
148 151245 : *idx = i;
149 151245 : return NT_STATUS_OK;
150 : }
151 : }
152 :
153 0 : DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
154 : gensec_ntlmssp->ntlmssp_state->role, ntlmssp_command));
155 :
156 0 : 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 :
167 151245 : 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 : {
172 740 : struct gensec_ntlmssp_context *gensec_ntlmssp =
173 151245 : talloc_get_type_abort(gensec_security->private_data,
174 : struct gensec_ntlmssp_context);
175 151245 : struct tevent_req *req = NULL;
176 151245 : struct gensec_ntlmssp_update_state *state = NULL;
177 740 : NTSTATUS status;
178 151245 : uint32_t i = 0;
179 :
180 151245 : req = tevent_req_create(mem_ctx, &state,
181 : struct gensec_ntlmssp_update_state);
182 151245 : if (req == NULL) {
183 0 : return NULL;
184 : }
185 :
186 151245 : status = gensec_ntlmssp_update_find(gensec_security,
187 : gensec_ntlmssp,
188 : in, &i);
189 151245 : if (tevent_req_nterror(req, status)) {
190 0 : return tevent_req_post(req, ev);
191 : }
192 :
193 151245 : if (ntlmssp_callbacks[i].send_fn != NULL) {
194 37324 : struct tevent_req *subreq = NULL;
195 :
196 37324 : state->cb = &ntlmssp_callbacks[i];
197 :
198 37324 : subreq = state->cb->send_fn(state, ev,
199 : gensec_security,
200 : in);
201 37324 : if (tevent_req_nomem(subreq, req)) {
202 0 : return tevent_req_post(req, ev);
203 : }
204 37324 : tevent_req_set_callback(subreq,
205 : gensec_ntlmssp_update_done,
206 : req);
207 37324 : return req;
208 : }
209 :
210 113921 : status = ntlmssp_callbacks[i].sync_fn(gensec_security,
211 : state,
212 113921 : in, &state->out);
213 113921 : state->status = status;
214 113921 : if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
215 76165 : tevent_req_done(req);
216 76165 : return tevent_req_post(req, ev);
217 : }
218 37756 : if (tevent_req_nterror(req, status)) {
219 100 : return tevent_req_post(req, ev);
220 : }
221 :
222 37656 : tevent_req_done(req);
223 37656 : return tevent_req_post(req, ev);
224 : }
225 :
226 37324 : static void gensec_ntlmssp_update_done(struct tevent_req *subreq)
227 : {
228 148 : struct tevent_req *req =
229 37324 : tevent_req_callback_data(subreq,
230 : struct tevent_req);
231 148 : struct gensec_ntlmssp_update_state *state =
232 37324 : tevent_req_data(req,
233 : struct gensec_ntlmssp_update_state);
234 148 : NTSTATUS status;
235 :
236 37324 : status = state->cb->recv_fn(subreq, state, &state->out);
237 37324 : TALLOC_FREE(subreq);
238 37324 : if (GENSEC_UPDATE_IS_NTERROR(status)) {
239 3795 : tevent_req_nterror(req, status);
240 3795 : return;
241 : }
242 :
243 33529 : state->status = status;
244 33529 : tevent_req_done(req);
245 : }
246 :
247 151245 : static NTSTATUS gensec_ntlmssp_update_recv(struct tevent_req *req,
248 : TALLOC_CTX *out_mem_ctx,
249 : DATA_BLOB *out)
250 : {
251 740 : struct gensec_ntlmssp_update_state *state =
252 151245 : tevent_req_data(req,
253 : struct gensec_ntlmssp_update_state);
254 740 : NTSTATUS status;
255 :
256 151245 : *out = data_blob_null;
257 :
258 151245 : if (tevent_req_is_nterror(req, &status)) {
259 3895 : tevent_req_received(req);
260 3895 : return status;
261 : }
262 :
263 147350 : *out = state->out;
264 147350 : talloc_steal(out_mem_ctx, state->out.data);
265 147350 : status = state->status;
266 147350 : tevent_req_received(req);
267 147350 : return status;
268 : }
269 :
270 66314 : static NTSTATUS gensec_ntlmssp_may_reset_crypto(struct gensec_security *gensec_security,
271 : bool full_reset)
272 : {
273 277 : struct gensec_ntlmssp_context *gensec_ntlmssp =
274 66314 : talloc_get_type_abort(gensec_security->private_data,
275 : struct gensec_ntlmssp_context);
276 66314 : struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
277 277 : NTSTATUS status;
278 66314 : bool reset_seqnums = full_reset;
279 :
280 66314 : if (!gensec_ntlmssp_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
281 330 : return NT_STATUS_OK;
282 : }
283 :
284 65984 : status = ntlmssp_sign_reset(ntlmssp_state, reset_seqnums);
285 65984 : if (!NT_STATUS_IS_OK(status)) {
286 0 : DEBUG(1, ("Could not reset NTLMSSP signing/sealing system (error was: %s)\n",
287 : nt_errstr(status)));
288 0 : return status;
289 : }
290 :
291 65984 : return NT_STATUS_OK;
292 : }
293 :
294 70266 : static const char *gensec_ntlmssp_final_auth_type(struct gensec_security *gensec_security)
295 : {
296 70266 : 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 : .weak_crypto = true,
309 : .oid = gensec_ntlmssp_oids,
310 : .client_start = gensec_ntlmssp_client_start,
311 : .server_start = gensec_ntlmssp_server_start,
312 : .magic = gensec_ntlmssp_magic,
313 : .update_send = gensec_ntlmssp_update_send,
314 : .update_recv = gensec_ntlmssp_update_recv,
315 : .may_reset_crypto= gensec_ntlmssp_may_reset_crypto,
316 : .sig_size = gensec_ntlmssp_sig_size,
317 : .sign_packet = gensec_ntlmssp_sign_packet,
318 : .check_packet = gensec_ntlmssp_check_packet,
319 : .seal_packet = gensec_ntlmssp_seal_packet,
320 : .unseal_packet = gensec_ntlmssp_unseal_packet,
321 : .wrap = gensec_ntlmssp_wrap,
322 : .unwrap = gensec_ntlmssp_unwrap,
323 : .session_key = gensec_ntlmssp_session_key,
324 : .session_info = gensec_ntlmssp_session_info,
325 : .have_feature = gensec_ntlmssp_have_feature,
326 : .final_auth_type = gensec_ntlmssp_final_auth_type,
327 : .enabled = true,
328 : .priority = GENSEC_NTLMSSP
329 : };
330 :
331 : static const struct gensec_security_ops gensec_ntlmssp_resume_ccache_ops = {
332 : .name = "ntlmssp_resume_ccache",
333 : .weak_crypto = true,
334 : .client_start = gensec_ntlmssp_resume_ccache_start,
335 : .update_send = gensec_ntlmssp_update_send,
336 : .update_recv = gensec_ntlmssp_update_recv,
337 : .session_key = gensec_ntlmssp_session_key,
338 : .have_feature = gensec_ntlmssp_have_feature,
339 : .enabled = true,
340 : .priority = GENSEC_NTLMSSP
341 : };
342 :
343 52291 : _PUBLIC_ NTSTATUS gensec_ntlmssp_init(TALLOC_CTX *ctx)
344 : {
345 1208 : NTSTATUS ret;
346 :
347 52291 : ret = gensec_register(ctx, &gensec_ntlmssp_security_ops);
348 52291 : if (!NT_STATUS_IS_OK(ret)) {
349 0 : DEBUG(0,("Failed to register '%s' gensec backend!\n",
350 : gensec_ntlmssp_security_ops.name));
351 0 : return ret;
352 : }
353 :
354 52291 : ret = gensec_register(ctx, &gensec_ntlmssp_resume_ccache_ops);
355 52291 : if (!NT_STATUS_IS_OK(ret)) {
356 0 : DEBUG(0,("Failed to register '%s' gensec backend!\n",
357 : gensec_ntlmssp_resume_ccache_ops.name));
358 0 : return ret;
359 : }
360 :
361 52291 : return ret;
362 : }
363 :
364 17265 : static struct gensec_security *gensec_find_child_by_ops(struct gensec_security *gensec_security,
365 : const struct gensec_security_ops *ops)
366 : {
367 17265 : struct gensec_security *current = gensec_security;
368 :
369 36719 : while (current != NULL) {
370 34408 : if (current->ops == ops) {
371 14954 : return current;
372 : }
373 :
374 19454 : current = current->child_security;
375 : }
376 :
377 2311 : return NULL;
378 : }
379 :
380 100 : uint32_t gensec_ntlmssp_neg_flags(struct gensec_security *gensec_security)
381 : {
382 0 : struct gensec_ntlmssp_context *gensec_ntlmssp;
383 :
384 100 : gensec_security = gensec_find_child_by_ops(gensec_security,
385 : &gensec_ntlmssp_security_ops);
386 100 : if (gensec_security == NULL) {
387 0 : return 0;
388 : }
389 :
390 100 : gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
391 : struct gensec_ntlmssp_context);
392 100 : return gensec_ntlmssp->ntlmssp_state->neg_flags;
393 : }
394 :
395 17165 : const char *gensec_ntlmssp_server_domain(struct gensec_security *gensec_security)
396 : {
397 0 : struct gensec_ntlmssp_context *gensec_ntlmssp;
398 :
399 17165 : gensec_security = gensec_find_child_by_ops(gensec_security,
400 : &gensec_ntlmssp_security_ops);
401 17165 : if (gensec_security == NULL) {
402 2311 : return NULL;
403 : }
404 :
405 14854 : gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
406 : struct gensec_ntlmssp_context);
407 14854 : return gensec_ntlmssp->ntlmssp_state->server.netbios_domain;
408 : }
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