source: branches/samba-3.5.x/source4/auth/ntlmssp/ntlmssp.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 13.8 KB
Line 
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 "../librpc/gen_ndr/ntlmssp.h"
27#include "../libcli/auth/libcli_auth.h"
28#include "librpc/gen_ndr/ndr_dcerpc.h"
29#include "auth/credentials/credentials.h"
30#include "auth/gensec/gensec.h"
31#include "auth/gensec/gensec_proto.h"
32#include "param/param.h"
33
34/**
35 * Callbacks for NTLMSSP - for both client and server operating modes
36 *
37 */
38
39static const struct ntlmssp_callbacks {
40 enum ntlmssp_role role;
41 enum ntlmssp_message_type command;
42 NTSTATUS (*sync_fn)(struct gensec_security *gensec_security,
43 TALLOC_CTX *out_mem_ctx,
44 DATA_BLOB in, DATA_BLOB *out);
45} ntlmssp_callbacks[] = {
46 {
47 .role = NTLMSSP_CLIENT,
48 .command = NTLMSSP_INITIAL,
49 .sync_fn = ntlmssp_client_initial,
50 },{
51 .role = NTLMSSP_SERVER,
52 .command = NTLMSSP_NEGOTIATE,
53 .sync_fn = ntlmssp_server_negotiate,
54 },{
55 .role = NTLMSSP_CLIENT,
56 .command = NTLMSSP_CHALLENGE,
57 .sync_fn = ntlmssp_client_challenge,
58 },{
59 .role = NTLMSSP_SERVER,
60 .command = NTLMSSP_AUTH,
61 .sync_fn = ntlmssp_server_auth,
62 }
63};
64
65
66/**
67 * Print out the NTLMSSP flags for debugging
68 * @param neg_flags The flags from the packet
69 */
70
71void debug_ntlmssp_flags(uint32_t neg_flags)
72{
73 DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
74
75 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
76 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_UNICODE\n"));
77 if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
78 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM\n"));
79 if (neg_flags & NTLMSSP_REQUEST_TARGET)
80 DEBUGADD(4, (" NTLMSSP_REQUEST_TARGET\n"));
81 if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
82 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SIGN\n"));
83 if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
84 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SEAL\n"));
85 if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM)
86 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_DATAGRAM\n"));
87 if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
88 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_LM_KEY\n"));
89 if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
90 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NETWARE\n"));
91 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
92 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM\n"));
93 if (neg_flags & NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED)
94 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED\n"));
95 if (neg_flags & NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED)
96 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED\n"));
97 if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
98 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
99 if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
100 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
101 if (neg_flags & NTLMSSP_REQUEST_NON_NT_SESSION_KEY)
102 DEBUGADD(4, (" NTLMSSP_REQUEST_NON_NT_SESSION_KEY\n"));
103 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
104 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM2\n"));
105 if (neg_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
106 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_TARGET_INFO\n"));
107 if (neg_flags & NTLMSSP_NEGOTIATE_128)
108 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_128\n"));
109 if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
110 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
111 if (neg_flags & NTLMSSP_NEGOTIATE_56)
112 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_56\n"));
113}
114
115static NTSTATUS gensec_ntlmssp_magic(struct gensec_security *gensec_security,
116 const DATA_BLOB *first_packet)
117{
118 if (first_packet->length > 8 && memcmp("NTLMSSP\0", first_packet->data, 8) == 0) {
119 return NT_STATUS_OK;
120 } else {
121 return NT_STATUS_INVALID_PARAMETER;
122 }
123}
124
125static NTSTATUS gensec_ntlmssp_update_find(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
126 const DATA_BLOB input, uint32_t *idx)
127{
128 struct gensec_security *gensec_security = gensec_ntlmssp_state->gensec_security;
129 uint32_t ntlmssp_command;
130 uint32_t i;
131
132 if (gensec_ntlmssp_state->expected_state == NTLMSSP_DONE) {
133 /* We are strict here because other modules, which we
134 * don't fully control (such as GSSAPI) are also
135 * strict, but are tested less often */
136
137 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
138 return NT_STATUS_INVALID_PARAMETER;
139 }
140
141 if (!input.length) {
142 switch (gensec_ntlmssp_state->role) {
143 case NTLMSSP_CLIENT:
144 ntlmssp_command = NTLMSSP_INITIAL;
145 break;
146 case NTLMSSP_SERVER:
147 if (gensec_security->want_features & GENSEC_FEATURE_DATAGRAM_MODE) {
148 /* 'datagram' mode - no neg packet */
149 ntlmssp_command = NTLMSSP_NEGOTIATE;
150 } else {
151 /* This is normal in SPNEGO mech negotiation fallback */
152 DEBUG(2, ("Failed to parse NTLMSSP packet: zero length\n"));
153 return NT_STATUS_INVALID_PARAMETER;
154 }
155 break;
156 }
157 } else {
158 if (!msrpc_parse(gensec_ntlmssp_state,
159 &input, "Cd",
160 "NTLMSSP",
161 &ntlmssp_command)) {
162 DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
163 dump_data(2, input.data, input.length);
164 return NT_STATUS_INVALID_PARAMETER;
165 }
166 }
167
168 if (ntlmssp_command != gensec_ntlmssp_state->expected_state) {
169 DEBUG(2, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, gensec_ntlmssp_state->expected_state));
170 return NT_STATUS_INVALID_PARAMETER;
171 }
172
173 for (i=0; i < ARRAY_SIZE(ntlmssp_callbacks); i++) {
174 if (ntlmssp_callbacks[i].role == gensec_ntlmssp_state->role &&
175 ntlmssp_callbacks[i].command == ntlmssp_command) {
176 *idx = i;
177 return NT_STATUS_OK;
178 }
179 }
180
181 DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
182 gensec_ntlmssp_state->role, ntlmssp_command));
183
184 return NT_STATUS_INVALID_PARAMETER;
185}
186
187/**
188 * Next state function for the wrapped NTLMSSP state machine
189 *
190 * @param gensec_security GENSEC state, initialised to NTLMSSP
191 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
192 * @param in The request, as a DATA_BLOB
193 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
194 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
195 * or NT_STATUS_OK if the user is authenticated.
196 */
197
198static NTSTATUS gensec_ntlmssp_update(struct gensec_security *gensec_security,
199 TALLOC_CTX *out_mem_ctx,
200 const DATA_BLOB input, DATA_BLOB *out)
201{
202 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
203 NTSTATUS status;
204 uint32_t i;
205
206 *out = data_blob(NULL, 0);
207
208 if (!out_mem_ctx) {
209 /* if the caller doesn't want to manage/own the memory,
210 we can put it on our context */
211 out_mem_ctx = gensec_ntlmssp_state;
212 }
213
214 status = gensec_ntlmssp_update_find(gensec_ntlmssp_state, input, &i);
215 NT_STATUS_NOT_OK_RETURN(status);
216
217 status = ntlmssp_callbacks[i].sync_fn(gensec_security, out_mem_ctx, input, out);
218 NT_STATUS_NOT_OK_RETURN(status);
219
220 return NT_STATUS_OK;
221}
222
223/**
224 * Return the NTLMSSP master session key
225 *
226 * @param gensec_ntlmssp_state NTLMSSP State
227 */
228
229NTSTATUS gensec_ntlmssp_session_key(struct gensec_security *gensec_security,
230 DATA_BLOB *session_key)
231{
232 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
233
234 if (gensec_ntlmssp_state->expected_state != NTLMSSP_DONE) {
235 return NT_STATUS_NO_USER_SESSION_KEY;
236 }
237
238 if (!gensec_ntlmssp_state->session_key.data) {
239 return NT_STATUS_NO_USER_SESSION_KEY;
240 }
241 *session_key = gensec_ntlmssp_state->session_key;
242
243 return NT_STATUS_OK;
244}
245
246void ntlmssp_handle_neg_flags(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
247 uint32_t neg_flags, bool allow_lm)
248{
249 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
250 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
251 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
252 gensec_ntlmssp_state->unicode = true;
253 } else {
254 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
255 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
256 gensec_ntlmssp_state->unicode = false;
257 }
258
259 if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm && !gensec_ntlmssp_state->use_ntlmv2) {
260 /* other end forcing us to use LM */
261 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
262 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
263 } else {
264 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
265 }
266
267 if (!(neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
268 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
269 }
270
271 if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
272 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
273 }
274
275 if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
276 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
277 }
278
279 if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
280 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
281 }
282
283 if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
284 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
285 }
286
287 if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
288 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
289 }
290
291 if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
292 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
293 }
294
295 /* Woop Woop - unknown flag for Windows compatibility...
296 What does this really do ? JRA. */
297 if (!(neg_flags & NTLMSSP_NEGOTIATE_VERSION)) {
298 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_VERSION;
299 }
300
301 if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
302 gensec_ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
303 }
304
305}
306
307/**
308 Weaken NTLMSSP keys to cope with down-level clients and servers.
309
310 We probably should have some parameters to control this, but as
311 it only occours for LM_KEY connections, and this is controlled
312 by the client lanman auth/lanman auth parameters, it isn't too bad.
313*/
314
315DATA_BLOB ntlmssp_weakend_key(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
316 TALLOC_CTX *mem_ctx)
317{
318 DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
319 gensec_ntlmssp_state->session_key.data,
320 gensec_ntlmssp_state->session_key.length);
321 /* Nothing to weaken. We certainly don't want to 'extend' the length... */
322 if (weakened_key.length < 16) {
323 /* perhaps there was no key? */
324 return weakened_key;
325 }
326
327 /* Key weakening not performed on the master key for NTLM2
328 and does not occour for NTLM1. Therefore we only need
329 to do this for the LM_KEY.
330 */
331 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
332 /* LM key doesn't support 128 bit crypto, so this is
333 * the best we can do. If you negotiate 128 bit, but
334 * not 56, you end up with 40 bit... */
335 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
336 weakened_key.data[7] = 0xa0;
337 weakened_key.length = 8;
338 } else { /* forty bits */
339 weakened_key.data[5] = 0xe5;
340 weakened_key.data[6] = 0x38;
341 weakened_key.data[7] = 0xb0;
342 weakened_key.length = 8;
343 }
344 }
345 return weakened_key;
346}
347
348static bool gensec_ntlmssp_have_feature(struct gensec_security *gensec_security,
349 uint32_t feature)
350{
351 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
352 if (feature & GENSEC_FEATURE_SIGN) {
353 if (!gensec_ntlmssp_state->session_key.length) {
354 return false;
355 }
356 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
357 return true;
358 }
359 }
360 if (feature & GENSEC_FEATURE_SEAL) {
361 if (!gensec_ntlmssp_state->session_key.length) {
362 return false;
363 }
364 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
365 return true;
366 }
367 }
368 if (feature & GENSEC_FEATURE_SESSION_KEY) {
369 if (gensec_ntlmssp_state->session_key.length) {
370 return true;
371 }
372 }
373 if (feature & GENSEC_FEATURE_DCE_STYLE) {
374 return true;
375 }
376 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
377 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
378 return true;
379 }
380 }
381 return false;
382}
383
384NTSTATUS gensec_ntlmssp_start(struct gensec_security *gensec_security)
385{
386 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
387
388 gensec_ntlmssp_state = talloc_zero(gensec_security, struct gensec_ntlmssp_state);
389 if (!gensec_ntlmssp_state) {
390 return NT_STATUS_NO_MEMORY;
391 }
392
393 gensec_ntlmssp_state->gensec_security = gensec_security;
394 gensec_ntlmssp_state->auth_context = NULL;
395 gensec_ntlmssp_state->server_info = NULL;
396
397 gensec_security->private_data = gensec_ntlmssp_state;
398 return NT_STATUS_OK;
399}
400
401static const char *gensec_ntlmssp_oids[] = {
402 GENSEC_OID_NTLMSSP,
403 NULL
404};
405
406static const struct gensec_security_ops gensec_ntlmssp_security_ops = {
407 .name = "ntlmssp",
408 .sasl_name = "NTLM",
409 .auth_type = DCERPC_AUTH_TYPE_NTLMSSP,
410 .oid = gensec_ntlmssp_oids,
411 .client_start = gensec_ntlmssp_client_start,
412 .server_start = gensec_ntlmssp_server_start,
413 .magic = gensec_ntlmssp_magic,
414 .update = gensec_ntlmssp_update,
415 .sig_size = gensec_ntlmssp_sig_size,
416 .sign_packet = gensec_ntlmssp_sign_packet,
417 .check_packet = gensec_ntlmssp_check_packet,
418 .seal_packet = gensec_ntlmssp_seal_packet,
419 .unseal_packet = gensec_ntlmssp_unseal_packet,
420 .wrap = gensec_ntlmssp_wrap,
421 .unwrap = gensec_ntlmssp_unwrap,
422 .session_key = gensec_ntlmssp_session_key,
423 .session_info = gensec_ntlmssp_session_info,
424 .have_feature = gensec_ntlmssp_have_feature,
425 .enabled = true,
426 .priority = GENSEC_NTLMSSP
427};
428
429
430_PUBLIC_ NTSTATUS gensec_ntlmssp_init(void)
431{
432 NTSTATUS ret;
433
434 ret = gensec_register(&gensec_ntlmssp_security_ops);
435 if (!NT_STATUS_IS_OK(ret)) {
436 DEBUG(0,("Failed to register '%s' gensec backend!\n",
437 gensec_ntlmssp_security_ops.name));
438 return ret;
439 }
440
441 return ret;
442}
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