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 "../libcli/auth/libcli_auth.h"
27 #include "librpc/gen_ndr/ndr_dcerpc.h"
28 #include "auth/gensec/gensec.h"
29 #include "auth/gensec/gensec_proto.h"
30 #include "auth/gensec/gensec_toplevel_proto.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 = gensec_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 = gensec_ntlmssp_server_auth,
64 static NTSTATUS gensec_ntlmssp_magic(struct gensec_security *gensec_security,
65 const DATA_BLOB *first_packet)
67 if (ntlmssp_blob_matches_magic(first_packet)) {
70 return NT_STATUS_INVALID_PARAMETER;
74 static NTSTATUS gensec_ntlmssp_update_find(struct ntlmssp_state *ntlmssp_state,
75 const DATA_BLOB input, uint32_t *idx)
77 struct gensec_ntlmssp_context *gensec_ntlmssp =
78 talloc_get_type_abort(ntlmssp_state->callback_private,
79 struct gensec_ntlmssp_context);
80 struct gensec_security *gensec_security = gensec_ntlmssp->gensec_security;
81 uint32_t ntlmssp_command;
84 if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
85 /* We are strict here because other modules, which we
86 * don't fully control (such as GSSAPI) are also
87 * strict, but are tested less often */
89 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
90 return NT_STATUS_INVALID_PARAMETER;
94 switch (ntlmssp_state->role) {
96 ntlmssp_command = NTLMSSP_INITIAL;
99 if (gensec_security->want_features & GENSEC_FEATURE_DATAGRAM_MODE) {
100 /* 'datagram' mode - no neg packet */
101 ntlmssp_command = NTLMSSP_NEGOTIATE;
103 /* This is normal in SPNEGO mech negotiation fallback */
104 DEBUG(2, ("Failed to parse NTLMSSP packet: zero length\n"));
105 return NT_STATUS_INVALID_PARAMETER;
110 if (!msrpc_parse(ntlmssp_state,
114 DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
115 dump_data(2, input.data, input.length);
116 return NT_STATUS_INVALID_PARAMETER;
120 if (ntlmssp_command != ntlmssp_state->expected_state) {
121 DEBUG(2, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
122 return NT_STATUS_INVALID_PARAMETER;
125 for (i=0; i < ARRAY_SIZE(ntlmssp_callbacks); i++) {
126 if (ntlmssp_callbacks[i].role == ntlmssp_state->role &&
127 ntlmssp_callbacks[i].command == ntlmssp_command) {
133 DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
134 ntlmssp_state->role, ntlmssp_command));
136 return NT_STATUS_INVALID_PARAMETER;
140 * Next state function for the wrapped NTLMSSP state machine
142 * @param gensec_security GENSEC state, initialised to NTLMSSP
143 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
144 * @param in The request, as a DATA_BLOB
145 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
146 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
147 * or NT_STATUS_OK if the user is authenticated.
150 static NTSTATUS gensec_ntlmssp_update(struct gensec_security *gensec_security,
151 TALLOC_CTX *out_mem_ctx,
152 const DATA_BLOB input, DATA_BLOB *out)
154 struct gensec_ntlmssp_context *gensec_ntlmssp =
155 talloc_get_type_abort(gensec_security->private_data,
156 struct gensec_ntlmssp_context);
157 struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
161 *out = data_blob(NULL, 0);
164 /* if the caller doesn't want to manage/own the memory,
165 we can put it on our context */
166 out_mem_ctx = ntlmssp_state;
169 status = gensec_ntlmssp_update_find(ntlmssp_state, input, &i);
170 NT_STATUS_NOT_OK_RETURN(status);
172 status = ntlmssp_callbacks[i].sync_fn(gensec_security, out_mem_ctx, input, out);
173 NT_STATUS_NOT_OK_RETURN(status);
179 * Return the NTLMSSP master session key
181 * @param ntlmssp_state NTLMSSP State
184 NTSTATUS gensec_ntlmssp_session_key(struct gensec_security *gensec_security,
186 DATA_BLOB *session_key)
188 struct gensec_ntlmssp_context *gensec_ntlmssp =
189 talloc_get_type_abort(gensec_security->private_data,
190 struct gensec_ntlmssp_context);
191 struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
193 if (ntlmssp_state->expected_state != NTLMSSP_DONE) {
194 return NT_STATUS_NO_USER_SESSION_KEY;
197 if (!ntlmssp_state->session_key.data) {
198 return NT_STATUS_NO_USER_SESSION_KEY;
200 *session_key = data_blob_talloc(mem_ctx, ntlmssp_state->session_key.data, ntlmssp_state->session_key.length);
201 if (!session_key->data) {
202 return NT_STATUS_NO_MEMORY;
208 static bool gensec_ntlmssp_have_feature(struct gensec_security *gensec_security,
211 struct gensec_ntlmssp_context *gensec_ntlmssp =
212 talloc_get_type_abort(gensec_security->private_data,
213 struct gensec_ntlmssp_context);
214 struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
216 if (feature & GENSEC_FEATURE_SIGN) {
217 if (!ntlmssp_state->session_key.length) {
220 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
224 if (feature & GENSEC_FEATURE_SEAL) {
225 if (!ntlmssp_state->session_key.length) {
228 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
232 if (feature & GENSEC_FEATURE_SESSION_KEY) {
233 if (ntlmssp_state->session_key.length) {
237 if (feature & GENSEC_FEATURE_DCE_STYLE) {
240 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
241 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
248 NTSTATUS gensec_ntlmssp_start(struct gensec_security *gensec_security)
250 struct gensec_ntlmssp_context *gensec_ntlmssp;
251 struct ntlmssp_state *ntlmssp_state;
253 gensec_ntlmssp = talloc_zero(gensec_security,
254 struct gensec_ntlmssp_context);
255 if (!gensec_ntlmssp) {
256 return NT_STATUS_NO_MEMORY;
259 gensec_ntlmssp->gensec_security = gensec_security;
261 ntlmssp_state = talloc_zero(gensec_ntlmssp,
262 struct ntlmssp_state);
263 if (!ntlmssp_state) {
264 return NT_STATUS_NO_MEMORY;
267 ntlmssp_state->callback_private = gensec_ntlmssp;
269 gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
271 gensec_security->private_data = gensec_ntlmssp;
275 static const char *gensec_ntlmssp_oids[] = {
280 static const struct gensec_security_ops gensec_ntlmssp_security_ops = {
282 .sasl_name = GENSEC_SASL_NAME_NTLMSSP, /* "NTLM" */
283 .auth_type = DCERPC_AUTH_TYPE_NTLMSSP,
284 .oid = gensec_ntlmssp_oids,
285 .client_start = gensec_ntlmssp_client_start,
286 .server_start = gensec_ntlmssp_server_start,
287 .magic = gensec_ntlmssp_magic,
288 .update = gensec_ntlmssp_update,
289 .sig_size = gensec_ntlmssp_sig_size,
290 .sign_packet = gensec_ntlmssp_sign_packet,
291 .check_packet = gensec_ntlmssp_check_packet,
292 .seal_packet = gensec_ntlmssp_seal_packet,
293 .unseal_packet = gensec_ntlmssp_unseal_packet,
294 .wrap = gensec_ntlmssp_wrap,
295 .unwrap = gensec_ntlmssp_unwrap,
296 .session_key = gensec_ntlmssp_session_key,
297 .session_info = gensec_ntlmssp_session_info,
298 .have_feature = gensec_ntlmssp_have_feature,
300 .priority = GENSEC_NTLMSSP
304 _PUBLIC_ NTSTATUS gensec_ntlmssp_init(void)
308 ret = gensec_register(&gensec_ntlmssp_security_ops);
309 if (!NT_STATUS_IS_OK(ret)) {
310 DEBUG(0,("Failed to register '%s' gensec backend!\n",
311 gensec_ntlmssp_security_ops.name));