2 Unix SMB/Netbios implementation.
4 handle NLTMSSP, client server side parsing
6 Copyright (C) Andrew Tridgell 2001
7 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
8 Copyright (C) Stefan Metzmacher 2005
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.
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.
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/>.
25 #include "auth/ntlmssp/ntlmssp.h"
26 #include "auth/ntlmssp/msrpc_parse.h"
27 #include "librpc/gen_ndr/ndr_dcerpc.h"
28 #include "auth/credentials/credentials.h"
29 #include "auth/gensec/gensec.h"
30 #include "auth/auth.h"
33 * Callbacks for NTLMSSP - for both client and server operating modes
37 static const struct ntlmssp_callbacks {
38 enum ntlmssp_role role;
39 enum ntlmssp_message_type command;
40 NTSTATUS (*sync_fn)(struct gensec_security *gensec_security,
41 TALLOC_CTX *out_mem_ctx,
42 DATA_BLOB in, DATA_BLOB *out);
43 } ntlmssp_callbacks[] = {
45 .role = NTLMSSP_CLIENT,
46 .command = NTLMSSP_INITIAL,
47 .sync_fn = ntlmssp_client_initial,
49 .role = NTLMSSP_SERVER,
50 .command = NTLMSSP_NEGOTIATE,
51 .sync_fn = ntlmssp_server_negotiate,
53 .role = NTLMSSP_CLIENT,
54 .command = NTLMSSP_CHALLENGE,
55 .sync_fn = ntlmssp_client_challenge,
57 .role = NTLMSSP_SERVER,
58 .command = NTLMSSP_AUTH,
59 .sync_fn = ntlmssp_server_auth,
65 * Print out the NTLMSSP flags for debugging
66 * @param neg_flags The flags from the packet
69 void debug_ntlmssp_flags(uint32_t neg_flags)
71 DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
73 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
74 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_UNICODE\n"));
75 if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
76 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM\n"));
77 if (neg_flags & NTLMSSP_REQUEST_TARGET)
78 DEBUGADD(4, (" NTLMSSP_REQUEST_TARGET\n"));
79 if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
80 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SIGN\n"));
81 if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
82 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SEAL\n"));
83 if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM_STYLE)
84 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_DATAGRAM_STYLE\n"));
85 if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
86 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_LM_KEY\n"));
87 if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
88 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NETWARE\n"));
89 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
90 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM\n"));
91 if (neg_flags & NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED)
92 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED\n"));
93 if (neg_flags & NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED)
94 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED\n"));
95 if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
96 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
97 if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
98 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
99 if (neg_flags & NTLMSSP_CHAL_ACCEPT_RESPONSE)
100 DEBUGADD(4, (" NTLMSSP_CHAL_ACCEPT_RESPONSE\n"));
101 if (neg_flags & NTLMSSP_CHAL_NON_NT_SESSION_KEY)
102 DEBUGADD(4, (" NTLMSSP_CHAL_NON_NT_SESSION_KEY\n"));
103 if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
104 DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM2\n"));
105 if (neg_flags & NTLMSSP_CHAL_TARGET_INFO)
106 DEBUGADD(4, (" NTLMSSP_CHAL_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"));
115 static NTSTATUS gensec_ntlmssp_magic(struct gensec_security *gensec_security,
116 const DATA_BLOB *first_packet)
118 if (first_packet->length > 8 && memcmp("NTLMSSP\0", first_packet->data, 8) == 0) {
121 return NT_STATUS_INVALID_PARAMETER;
125 static NTSTATUS gensec_ntlmssp_update_find(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
126 const DATA_BLOB input, uint32_t *idx)
128 struct gensec_security *gensec_security = gensec_ntlmssp_state->gensec_security;
129 uint32_t ntlmssp_command;
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 */
137 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
138 return NT_STATUS_INVALID_PARAMETER;
142 switch (gensec_ntlmssp_state->role) {
144 ntlmssp_command = NTLMSSP_INITIAL;
147 if (gensec_security->want_features & GENSEC_FEATURE_DATAGRAM_MODE) {
148 /* 'datagram' mode - no neg packet */
149 ntlmssp_command = NTLMSSP_NEGOTIATE;
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;
158 if (!msrpc_parse(gensec_ntlmssp_state,
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;
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;
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) {
181 DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
182 gensec_ntlmssp_state->role, ntlmssp_command));
184 return NT_STATUS_INVALID_PARAMETER;
188 * Next state function for the wrapped NTLMSSP state machine
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.
198 static NTSTATUS gensec_ntlmssp_update(struct gensec_security *gensec_security,
199 TALLOC_CTX *out_mem_ctx,
200 const DATA_BLOB input, DATA_BLOB *out)
202 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
206 *out = data_blob(NULL, 0);
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;
214 status = gensec_ntlmssp_update_find(gensec_ntlmssp_state, input, &i);
215 NT_STATUS_NOT_OK_RETURN(status);
217 status = ntlmssp_callbacks[i].sync_fn(gensec_security, out_mem_ctx, input, out);
218 NT_STATUS_NOT_OK_RETURN(status);
224 * Return the NTLMSSP master session key
226 * @param gensec_ntlmssp_state NTLMSSP State
229 NTSTATUS gensec_ntlmssp_session_key(struct gensec_security *gensec_security,
230 DATA_BLOB *session_key)
232 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
234 if (!gensec_ntlmssp_state->session_key.data) {
235 return NT_STATUS_NO_USER_SESSION_KEY;
237 *session_key = gensec_ntlmssp_state->session_key;
242 void ntlmssp_handle_neg_flags(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
243 uint32_t neg_flags, BOOL allow_lm)
245 if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
246 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
247 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
248 gensec_ntlmssp_state->unicode = True;
250 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
251 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
252 gensec_ntlmssp_state->unicode = False;
255 if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm && !gensec_ntlmssp_state->use_ntlmv2) {
256 /* other end forcing us to use LM */
257 gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
258 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
260 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
263 if (!(neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
264 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
267 if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
268 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
271 if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
272 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
275 if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
276 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
279 if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
280 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
283 if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
284 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
287 if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
288 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
291 /* Woop Woop - unknown flag for Windows compatibility...
292 What does this really do ? JRA. */
293 if (!(neg_flags & NTLMSSP_UNKNOWN_02000000)) {
294 gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_UNKNOWN_02000000;
297 if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
298 gensec_ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
304 Weaken NTLMSSP keys to cope with down-level clients and servers.
306 We probably should have some parameters to control this, but as
307 it only occours for LM_KEY connections, and this is controlled
308 by the client lanman auth/lanman auth parameters, it isn't too bad.
311 DATA_BLOB ntlmssp_weakend_key(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
314 DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
315 gensec_ntlmssp_state->session_key.data,
316 gensec_ntlmssp_state->session_key.length);
317 /* Nothing to weaken. We certainly don't want to 'extend' the length... */
318 if (weakened_key.length < 16) {
319 /* perhaps there was no key? */
323 /* Key weakening not performed on the master key for NTLM2
324 and does not occour for NTLM1. Therefore we only need
325 to do this for the LM_KEY.
327 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
328 /* LM key doesn't support 128 bit crypto, so this is
329 * the best we can do. If you negotiate 128 bit, but
330 * not 56, you end up with 40 bit... */
331 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
332 weakened_key.data[7] = 0xa0;
333 weakened_key.length = 8;
334 } else { /* forty bits */
335 weakened_key.data[5] = 0xe5;
336 weakened_key.data[6] = 0x38;
337 weakened_key.data[7] = 0xb0;
338 weakened_key.length = 8;
344 static BOOL gensec_ntlmssp_have_feature(struct gensec_security *gensec_security,
347 struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
348 if (feature & GENSEC_FEATURE_SIGN) {
349 if (!gensec_ntlmssp_state->session_key.length) {
352 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
356 if (feature & GENSEC_FEATURE_SEAL) {
357 if (!gensec_ntlmssp_state->session_key.length) {
360 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
364 if (feature & GENSEC_FEATURE_SESSION_KEY) {
365 if (gensec_ntlmssp_state->session_key.length) {
369 if (feature & GENSEC_FEATURE_DCE_STYLE) {
372 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
373 if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
380 NTSTATUS gensec_ntlmssp_start(struct gensec_security *gensec_security)
382 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
384 gensec_ntlmssp_state = talloc_zero(gensec_security, struct gensec_ntlmssp_state);
385 if (!gensec_ntlmssp_state) {
386 return NT_STATUS_NO_MEMORY;
389 gensec_ntlmssp_state->gensec_security = gensec_security;
390 gensec_ntlmssp_state->auth_context = NULL;
391 gensec_ntlmssp_state->server_info = NULL;
393 gensec_security->private_data = gensec_ntlmssp_state;
397 static const char *gensec_ntlmssp_oids[] = {
402 static const struct gensec_security_ops gensec_ntlmssp_security_ops = {
405 .auth_type = DCERPC_AUTH_TYPE_NTLMSSP,
406 .oid = gensec_ntlmssp_oids,
407 .client_start = gensec_ntlmssp_client_start,
408 .server_start = gensec_ntlmssp_server_start,
409 .magic = gensec_ntlmssp_magic,
410 .update = gensec_ntlmssp_update,
411 .sig_size = gensec_ntlmssp_sig_size,
412 .sign_packet = gensec_ntlmssp_sign_packet,
413 .check_packet = gensec_ntlmssp_check_packet,
414 .seal_packet = gensec_ntlmssp_seal_packet,
415 .unseal_packet = gensec_ntlmssp_unseal_packet,
416 .wrap = gensec_ntlmssp_wrap,
417 .unwrap = gensec_ntlmssp_unwrap,
418 .session_key = gensec_ntlmssp_session_key,
419 .session_info = gensec_ntlmssp_session_info,
420 .have_feature = gensec_ntlmssp_have_feature,
422 .priority = GENSEC_NTLMSSP
426 NTSTATUS gensec_ntlmssp_init(void)
432 ret = gensec_register(&gensec_ntlmssp_security_ops);
433 if (!NT_STATUS_IS_OK(ret)) {
434 DEBUG(0,("Failed to register '%s' gensec backend!\n",
435 gensec_ntlmssp_security_ops.name));