source: vendor/3.5.6/source4/auth/gensec/schannel.c

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

Samba 3.5.0: Initial import
File size: 11.5 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 dcerpc schannel operations
5
6 Copyright (C) Andrew Tridgell 2004
7 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21*/
22
23#include "includes.h"
24#include "librpc/gen_ndr/ndr_schannel.h"
25#include "auth/auth.h"
26#include "auth/credentials/credentials.h"
27#include "auth/gensec/gensec.h"
28#include "auth/gensec/gensec_proto.h"
29#include "../libcli/auth/schannel.h"
30#include "auth/gensec/schannel_state.h"
31#include "librpc/rpc/dcerpc.h"
32#include "param/param.h"
33#include "auth/session_proto.h"
34
35static size_t schannel_sig_size(struct gensec_security *gensec_security, size_t data_size)
36{
37 return 32;
38}
39
40static NTSTATUS schannel_session_key(struct gensec_security *gensec_security,
41 DATA_BLOB *session_key)
42{
43 return NT_STATUS_NOT_IMPLEMENTED;
44}
45
46static NTSTATUS schannel_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
47 const DATA_BLOB in, DATA_BLOB *out)
48{
49 struct schannel_state *state = (struct schannel_state *)gensec_security->private_data;
50 NTSTATUS status;
51 enum ndr_err_code ndr_err;
52 struct NL_AUTH_MESSAGE bind_schannel;
53 struct NL_AUTH_MESSAGE bind_schannel_ack;
54 struct netlogon_creds_CredentialState *creds;
55 struct ldb_context *schannel_ldb;
56 const char *workstation;
57 const char *domain;
58 uint32_t required_flags;
59
60 *out = data_blob(NULL, 0);
61
62 switch (gensec_security->gensec_role) {
63 case GENSEC_CLIENT:
64 if (state->state != SCHANNEL_STATE_START) {
65 /* we could parse the bind ack, but we don't know what it is yet */
66 return NT_STATUS_OK;
67 }
68
69 state->creds = talloc_reference(state, cli_credentials_get_netlogon_creds(gensec_security->credentials));
70
71 bind_schannel.MessageType = NL_NEGOTIATE_REQUEST;
72#if 0
73 /* to support this we'd need to have access to the full domain name */
74 /* 0x17, 23 */
75 bind_schannel.Flags = NL_FLAG_OEM_NETBIOS_DOMAIN_NAME |
76 NL_FLAG_OEM_NETBIOS_COMPUTER_NAME |
77 NL_FLAG_UTF8_DNS_DOMAIN_NAME |
78 NL_FLAG_UTF8_NETBIOS_COMPUTER_NAME;
79 bind_schannel.oem_netbios_domain.a = cli_credentials_get_domain(gensec_security->credentials);
80 bind_schannel.oem_netbios_computer.a = cli_credentials_get_workstation(gensec_security->credentials);
81 bind_schannel.utf8_dns_domain = cli_credentials_get_realm(gensec_security->credentials);
82 /* w2k3 refuses us if we use the full DNS workstation?
83 why? perhaps because we don't fill in the dNSHostName
84 attribute in the machine account? */
85 bind_schannel.utf8_netbios_computer = cli_credentials_get_workstation(gensec_security->credentials);
86#else
87 bind_schannel.Flags = NL_FLAG_OEM_NETBIOS_DOMAIN_NAME |
88 NL_FLAG_OEM_NETBIOS_COMPUTER_NAME;
89 bind_schannel.oem_netbios_domain.a = cli_credentials_get_domain(gensec_security->credentials);
90 bind_schannel.oem_netbios_computer.a = cli_credentials_get_workstation(gensec_security->credentials);
91#endif
92
93 ndr_err = ndr_push_struct_blob(out, out_mem_ctx,
94 gensec_security->settings->iconv_convenience, &bind_schannel,
95 (ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
96 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
97 status = ndr_map_error2ntstatus(ndr_err);
98 DEBUG(3, ("Could not create schannel bind: %s\n",
99 nt_errstr(status)));
100 return status;
101 }
102
103 state->state = SCHANNEL_STATE_UPDATE_1;
104
105 return NT_STATUS_MORE_PROCESSING_REQUIRED;
106 case GENSEC_SERVER:
107
108 required_flags = NL_FLAG_OEM_NETBIOS_COMPUTER_NAME |
109 NL_FLAG_OEM_NETBIOS_DOMAIN_NAME;
110
111 if (state->state != SCHANNEL_STATE_START) {
112 /* no third leg on this protocol */
113 return NT_STATUS_INVALID_PARAMETER;
114 }
115
116 /* parse the schannel startup blob */
117 ndr_err = ndr_pull_struct_blob(&in, out_mem_ctx,
118 gensec_security->settings->iconv_convenience,
119 &bind_schannel,
120 (ndr_pull_flags_fn_t)ndr_pull_NL_AUTH_MESSAGE);
121 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
122 status = ndr_map_error2ntstatus(ndr_err);
123 DEBUG(3, ("Could not parse incoming schannel bind: %s\n",
124 nt_errstr(status)));
125 return status;
126 }
127
128 if (!(required_flags == (bind_schannel.Flags & required_flags))) {
129 return NT_STATUS_INVALID_PARAMETER;
130 }
131
132 workstation = bind_schannel.oem_netbios_computer.a;
133 domain = bind_schannel.oem_netbios_domain.a;
134
135 if (strcasecmp_m(domain, lp_workgroup(gensec_security->settings->lp_ctx)) != 0) {
136 DEBUG(3, ("Request for schannel to incorrect domain: %s != our domain %s\n",
137 domain, lp_workgroup(gensec_security->settings->lp_ctx)));
138
139 return NT_STATUS_LOGON_FAILURE;
140 }
141
142 schannel_ldb = schannel_db_connect(out_mem_ctx, gensec_security->event_ctx,
143 gensec_security->settings->lp_ctx);
144 if (!schannel_ldb) {
145 return NT_STATUS_ACCESS_DENIED;
146 }
147 /* pull the session key for this client */
148 status = schannel_fetch_session_key_ldb(schannel_ldb,
149 out_mem_ctx, workstation, &creds);
150 talloc_free(schannel_ldb);
151 if (!NT_STATUS_IS_OK(status)) {
152 DEBUG(3, ("Could not find session key for attempted schannel connection from %s: %s\n",
153 workstation, nt_errstr(status)));
154 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
155 return NT_STATUS_LOGON_FAILURE;
156 }
157 return status;
158 }
159
160 state->creds = talloc_reference(state, creds);
161
162 bind_schannel_ack.MessageType = NL_NEGOTIATE_RESPONSE;
163 bind_schannel_ack.Flags = 0;
164 bind_schannel_ack.Buffer.dummy = 0x6c0000; /* actually I think
165 * this does not have
166 * any meaning here
167 * - gd */
168
169 ndr_err = ndr_push_struct_blob(out, out_mem_ctx,
170 gensec_security->settings->iconv_convenience, &bind_schannel_ack,
171 (ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
172 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
173 status = ndr_map_error2ntstatus(ndr_err);
174 DEBUG(3, ("Could not return schannel bind ack for client %s: %s\n",
175 workstation, nt_errstr(status)));
176 return status;
177 }
178
179 state->state = SCHANNEL_STATE_UPDATE_1;
180
181 return NT_STATUS_OK;
182 }
183 return NT_STATUS_INVALID_PARAMETER;
184}
185
186/**
187 * Return the struct netlogon_creds_CredentialState.
188 *
189 * Make sure not to call this unless gensec is using schannel...
190 */
191
192/* TODO: make this non-public */
193
194_PUBLIC_ NTSTATUS dcerpc_schannel_creds(struct gensec_security *gensec_security,
195 TALLOC_CTX *mem_ctx,
196 struct netlogon_creds_CredentialState **creds)
197{
198 struct schannel_state *state = talloc_get_type(gensec_security->private_data, struct schannel_state);
199
200 *creds = talloc_reference(mem_ctx, state->creds);
201 if (!*creds) {
202 return NT_STATUS_NO_MEMORY;
203 }
204 return NT_STATUS_OK;
205}
206
207
208/**
209 * Returns anonymous credentials for schannel, matching Win2k3.
210 *
211 */
212
213static NTSTATUS schannel_session_info(struct gensec_security *gensec_security,
214 struct auth_session_info **_session_info)
215{
216 struct schannel_state *state = talloc_get_type(gensec_security->private_data, struct schannel_state);
217 return auth_anonymous_session_info(state, gensec_security->event_ctx, gensec_security->settings->lp_ctx, _session_info);
218}
219
220static NTSTATUS schannel_start(struct gensec_security *gensec_security)
221{
222 struct schannel_state *state;
223
224 state = talloc(gensec_security, struct schannel_state);
225 if (!state) {
226 return NT_STATUS_NO_MEMORY;
227 }
228
229 state->state = SCHANNEL_STATE_START;
230 state->seq_num = 0;
231 gensec_security->private_data = state;
232
233 return NT_STATUS_OK;
234}
235
236static NTSTATUS schannel_server_start(struct gensec_security *gensec_security)
237{
238 NTSTATUS status;
239 struct schannel_state *state;
240
241 status = schannel_start(gensec_security);
242 if (!NT_STATUS_IS_OK(status)) {
243 return status;
244 }
245
246 state = (struct schannel_state *)gensec_security->private_data;
247 state->initiator = false;
248
249 return NT_STATUS_OK;
250}
251
252static NTSTATUS schannel_client_start(struct gensec_security *gensec_security)
253{
254 NTSTATUS status;
255 struct schannel_state *state;
256
257 status = schannel_start(gensec_security);
258 if (!NT_STATUS_IS_OK(status)) {
259 return status;
260 }
261
262 state = (struct schannel_state *)gensec_security->private_data;
263 state->initiator = true;
264
265 return NT_STATUS_OK;
266}
267
268
269static bool schannel_have_feature(struct gensec_security *gensec_security,
270 uint32_t feature)
271{
272 if (feature & (GENSEC_FEATURE_SIGN |
273 GENSEC_FEATURE_SEAL)) {
274 return true;
275 }
276 if (feature & GENSEC_FEATURE_DCE_STYLE) {
277 return true;
278 }
279 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
280 return true;
281 }
282 return false;
283}
284
285/*
286 unseal a packet
287*/
288static NTSTATUS schannel_unseal_packet(struct gensec_security *gensec_security,
289 TALLOC_CTX *mem_ctx,
290 uint8_t *data, size_t length,
291 const uint8_t *whole_pdu, size_t pdu_length,
292 const DATA_BLOB *sig)
293{
294 struct schannel_state *state =
295 talloc_get_type(gensec_security->private_data,
296 struct schannel_state);
297
298 return netsec_incoming_packet(state, mem_ctx, true,
299 discard_const_p(uint8_t, data),
300 length, sig);
301}
302
303/*
304 check the signature on a packet
305*/
306static NTSTATUS schannel_check_packet(struct gensec_security *gensec_security,
307 TALLOC_CTX *mem_ctx,
308 const uint8_t *data, size_t length,
309 const uint8_t *whole_pdu, size_t pdu_length,
310 const DATA_BLOB *sig)
311{
312 struct schannel_state *state =
313 talloc_get_type(gensec_security->private_data,
314 struct schannel_state);
315
316 return netsec_incoming_packet(state, mem_ctx, false,
317 discard_const_p(uint8_t, data),
318 length, sig);
319}
320/*
321 seal a packet
322*/
323static NTSTATUS schannel_seal_packet(struct gensec_security *gensec_security,
324 TALLOC_CTX *mem_ctx,
325 uint8_t *data, size_t length,
326 const uint8_t *whole_pdu, size_t pdu_length,
327 DATA_BLOB *sig)
328{
329 struct schannel_state *state =
330 talloc_get_type(gensec_security->private_data,
331 struct schannel_state);
332
333 return netsec_outgoing_packet(state, mem_ctx, true,
334 data, length, sig);
335}
336
337/*
338 sign a packet
339*/
340static NTSTATUS schannel_sign_packet(struct gensec_security *gensec_security,
341 TALLOC_CTX *mem_ctx,
342 const uint8_t *data, size_t length,
343 const uint8_t *whole_pdu, size_t pdu_length,
344 DATA_BLOB *sig)
345{
346 struct schannel_state *state =
347 talloc_get_type(gensec_security->private_data,
348 struct schannel_state);
349
350 return netsec_outgoing_packet(state, mem_ctx, false,
351 discard_const_p(uint8_t, data),
352 length, sig);
353}
354
355static const struct gensec_security_ops gensec_schannel_security_ops = {
356 .name = "schannel",
357 .auth_type = DCERPC_AUTH_TYPE_SCHANNEL,
358 .client_start = schannel_client_start,
359 .server_start = schannel_server_start,
360 .update = schannel_update,
361 .seal_packet = schannel_seal_packet,
362 .sign_packet = schannel_sign_packet,
363 .check_packet = schannel_check_packet,
364 .unseal_packet = schannel_unseal_packet,
365 .session_key = schannel_session_key,
366 .session_info = schannel_session_info,
367 .sig_size = schannel_sig_size,
368 .have_feature = schannel_have_feature,
369 .enabled = true,
370 .priority = GENSEC_SCHANNEL
371};
372
373_PUBLIC_ NTSTATUS gensec_schannel_init(void)
374{
375 NTSTATUS ret;
376 ret = gensec_register(&gensec_schannel_security_ops);
377 if (!NT_STATUS_IS_OK(ret)) {
378 DEBUG(0,("Failed to register '%s' gensec backend!\n",
379 gensec_schannel_security_ops.name));
380 return ret;
381 }
382
383 return ret;
384}
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