2 Unix SMB/CIFS implementation.
4 dcerpc schannel operations
6 Copyright (C) Andrew Tridgell 2004
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 enum schannel_position {
26 DCERPC_SCHANNEL_STATE_START = 0,
27 DCERPC_SCHANNEL_STATE_UPDATE_1
30 struct dcerpc_schannel_state {
32 enum schannel_position state;
33 struct schannel_state *schannel_state;
34 struct creds_CredentialState creds;
38 static NTSTATUS dcerpc_schannel_key(struct dcerpc_pipe *p,
43 uint8_t new_session_key[16]);
46 wrappers for the schannel_*() functions
48 These will become static again, when we get dynamic registration, and
49 decrpc_schannel_security_ops come back here.
51 static NTSTATUS dcerpc_schannel_unseal_packet(struct gensec_security *gensec_security,
53 uint8_t *data, size_t length,
54 const uint8_t *whole_pdu, size_t pdu_length,
57 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
59 return schannel_unseal_packet(dce_schan_state->schannel_state, mem_ctx, data, length, sig);
62 static NTSTATUS dcerpc_schannel_check_packet(struct gensec_security *gensec_security,
64 const uint8_t *data, size_t length,
65 const uint8_t *whole_pdu, size_t pdu_length,
68 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
70 return schannel_check_packet(dce_schan_state->schannel_state, data, length, sig);
73 static NTSTATUS dcerpc_schannel_seal_packet(struct gensec_security *gensec_security,
75 uint8_t *data, size_t length,
76 const uint8_t *whole_pdu, size_t pdu_length,
79 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
81 return schannel_seal_packet(dce_schan_state->schannel_state, mem_ctx, data, length, sig);
84 static NTSTATUS dcerpc_schannel_sign_packet(struct gensec_security *gensec_security,
86 const uint8_t *data, size_t length,
87 const uint8_t *whole_pdu, size_t pdu_length,
90 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
92 return schannel_sign_packet(dce_schan_state->schannel_state, mem_ctx, data, length, sig);
95 static size_t dcerpc_schannel_sig_size(struct gensec_security *gensec_security)
100 static NTSTATUS dcerpc_schannel_session_key(struct gensec_security *gensec_security,
101 DATA_BLOB *session_key)
103 return NT_STATUS_NOT_IMPLEMENTED;
106 static NTSTATUS dcerpc_schannel_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
107 const DATA_BLOB in, DATA_BLOB *out)
109 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
111 struct schannel_bind bind_schannel;
112 struct schannel_bind_ack bind_schannel_ack;
113 const char *account_name;
114 *out = data_blob(NULL, 0);
116 switch (gensec_security->gensec_role) {
118 if (dce_schan_state->state != DCERPC_SCHANNEL_STATE_START) {
119 /* we could parse the bind ack, but we don't know what it is yet */
123 bind_schannel.unknown1 = 0;
125 /* to support this we'd need to have access to the full domain name */
126 bind_schannel.bind_type = 23;
127 bind_schannel.u.info23.domain = gensec_security->user.domain;
128 bind_schannel.u.info23.account_name = gensec_security->user.name;
129 bind_schannel.u.info23.dnsdomain = str_format_nbt_domain(out_mem_ctx, fulldomainname);
130 bind_schannel.u.info23.workstation = str_format_nbt_domain(out_mem_ctx, gensec_security->user.name);
132 bind_schannel.bind_type = 3;
133 bind_schannel.u.info3.domain = gensec_security->user.domain;
134 bind_schannel.u.info3.account_name = gensec_security->user.name;
137 status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel,
138 (ndr_push_flags_fn_t)ndr_push_schannel_bind);
139 if (!NT_STATUS_IS_OK(status)) {
140 DEBUG(3, ("Could not create schannel bind: %s\n",
145 dce_schan_state->state = DCERPC_SCHANNEL_STATE_UPDATE_1;
147 return NT_STATUS_MORE_PROCESSING_REQUIRED;
150 if (dce_schan_state->state != DCERPC_SCHANNEL_STATE_START) {
151 /* no third leg on this protocol */
152 return NT_STATUS_INVALID_PARAMETER;
155 /* parse the schannel startup blob */
156 status = ndr_pull_struct_blob(&in, out_mem_ctx, &bind_schannel,
157 (ndr_pull_flags_fn_t)ndr_pull_schannel_bind);
158 if (!NT_STATUS_IS_OK(status)) {
162 if (bind_schannel.bind_type == 23) {
163 account_name = bind_schannel.u.info23.account_name;
165 account_name = bind_schannel.u.info3.account_name;
168 /* pull the session key for this client */
169 status = schannel_fetch_session_key(out_mem_ctx, account_name, &dce_schan_state->creds);
170 if (!NT_STATUS_IS_OK(status)) {
171 DEBUG(3, ("Could not find session key for attempted schannel connection on %s: %s\n",
172 account_name, nt_errstr(status)));
176 dce_schan_state->account_name = talloc_strdup(dce_schan_state->mem_ctx, account_name);
178 /* start up the schannel server code */
179 status = schannel_start(&dce_schan_state->schannel_state,
180 dce_schan_state->creds.session_key, False);
181 if (!NT_STATUS_IS_OK(status)) {
182 DEBUG(3, ("Could not initialise schannel state for account %s: %s\n",
183 account_name, nt_errstr(status)));
187 bind_schannel_ack.unknown1 = 1;
188 bind_schannel_ack.unknown2 = 0;
189 bind_schannel_ack.unknown3 = 0x6c0000;
191 status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel_ack,
192 (ndr_push_flags_fn_t)ndr_push_schannel_bind_ack);
193 if (!NT_STATUS_IS_OK(status)) {
194 DEBUG(3, ("Could not return schannel bind ack for account %s: %s\n",
195 account_name, nt_errstr(status)));
199 dce_schan_state->state = DCERPC_SCHANNEL_STATE_UPDATE_1;
203 return NT_STATUS_INVALID_PARAMETER;
207 * Return the credentials of a logged on user, including session keys
210 * Only valid after a successful authentication
212 * May only be called once per authentication.
216 NTSTATUS dcerpc_schannel_session_info(struct gensec_security *gensec_security,
217 struct auth_session_info **session_info)
219 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
221 (*session_info) = talloc_p(gensec_security, struct auth_session_info);
222 if (*session_info == NULL) {
223 return NT_STATUS_NO_MEMORY;
226 ZERO_STRUCTP(*session_info);
227 (*session_info)->refcount = 1;
229 (*session_info)->workstation = talloc_strdup(*session_info, dce_schan_state->account_name);
230 if ((*session_info)->workstation == NULL) {
231 talloc_free(*session_info);
232 return NT_STATUS_NO_MEMORY;
239 * Return the struct creds_CredentialState.
241 * Make sure not to call this unless gensec is using schannel...
244 NTSTATUS dcerpc_schannel_creds(struct gensec_security *gensec_security,
246 struct creds_CredentialState **creds)
248 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
250 *creds = talloc_p(mem_ctx, struct creds_CredentialState);
252 return NT_STATUS_NO_MEMORY;
255 **creds = dce_schan_state->creds;
260 static NTSTATUS dcerpc_schannel_start(struct gensec_security *gensec_security)
262 struct dcerpc_schannel_state *dce_schan_state;
264 mem_ctx = talloc_init("dcerpc_schannel_start");
266 return NT_STATUS_NO_MEMORY;
269 dce_schan_state = talloc_p(mem_ctx, struct dcerpc_schannel_state);
270 if (!dce_schan_state) {
271 talloc_destroy(mem_ctx);
272 return NT_STATUS_NO_MEMORY;
275 dce_schan_state->mem_ctx = mem_ctx;
276 dce_schan_state->state = DCERPC_SCHANNEL_STATE_START;
279 gensec_security->private_data = dce_schan_state;
284 static NTSTATUS dcerpc_schannel_server_start(struct gensec_security *gensec_security)
287 struct dcerpc_schannel_state *dce_schan_state;
289 status = dcerpc_schannel_start(gensec_security);
291 dce_schan_state = gensec_security->private_data;
292 dce_schan_state->schannel_state = NULL;
294 if (!NT_STATUS_IS_OK(status)) {
300 static NTSTATUS dcerpc_schannel_client_start(struct gensec_security *gensec_security)
303 struct dcerpc_schannel_state *dce_schan_state;
305 status = dcerpc_schannel_start(gensec_security);
306 if (!NT_STATUS_IS_OK(status)) {
309 dce_schan_state = gensec_security->private_data;
311 status = schannel_start(&dce_schan_state->schannel_state,
312 gensec_security->user.schan_session_key,
314 if (!NT_STATUS_IS_OK(status)) {
315 DEBUG(1, ("Failed to start schannel client\n"));
319 dump_data_pw("session key:\n", dce_schan_state->schannel_state->session_key, 16);
326 static void dcerpc_schannel_end(struct gensec_security *gensec_security)
328 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
330 schannel_end(&dce_schan_state->schannel_state);
332 talloc_destroy(dce_schan_state->mem_ctx);
334 gensec_security->private_data = NULL;
339 get a schannel key using a netlogon challenge on a secondary pipe
341 static NTSTATUS dcerpc_schannel_key(struct dcerpc_pipe *p,
343 const char *username,
344 const char *password,
346 uint8_t new_session_key[16])
349 struct dcerpc_pipe *p2;
350 struct netr_ServerReqChallenge r;
351 struct netr_ServerAuthenticate2 a;
352 struct netr_Credential credentials1, credentials2, credentials3;
353 struct samr_Password mach_pwd;
354 struct creds_CredentialState creds;
355 const char *workgroup, *workstation;
356 uint32_t negotiate_flags;
358 if (p->flags & DCERPC_SCHANNEL_128) {
359 negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
361 negotiate_flags = NETLOGON_NEG_AUTH2_FLAGS;
364 workstation = username;
368 step 1 - establish a netlogon connection, with no authentication
370 status = dcerpc_secondary_connection(p, &p2,
371 DCERPC_NETLOGON_NAME,
372 DCERPC_NETLOGON_UUID,
373 DCERPC_NETLOGON_VERSION);
377 step 2 - request a netlogon challenge
379 r.in.server_name = talloc_asprintf(p, "\\\\%s", dcerpc_server_name(p));
380 r.in.computer_name = workstation;
381 r.in.credentials = &credentials1;
382 r.out.credentials = &credentials2;
384 generate_random_buffer(credentials1.data, sizeof(credentials1.data));
386 status = dcerpc_netr_ServerReqChallenge(p2, p, &r);
387 if (!NT_STATUS_IS_OK(status)) {
392 step 3 - authenticate on the netlogon pipe
394 E_md4hash(password, mach_pwd.hash);
395 creds_client_init(&creds, &credentials1, &credentials2, &mach_pwd, &credentials3,
398 a.in.server_name = r.in.server_name;
399 a.in.account_name = talloc_asprintf(p, "%s$", workstation);
400 a.in.secure_channel_type = chan_type;
401 a.in.computer_name = workstation;
402 a.in.negotiate_flags = &negotiate_flags;
403 a.out.negotiate_flags = &negotiate_flags;
404 a.in.credentials = &credentials3;
405 a.out.credentials = &credentials3;
407 status = dcerpc_netr_ServerAuthenticate2(p2, p, &a);
408 if (!NT_STATUS_IS_OK(status)) {
412 if (!creds_client_check(&creds, a.out.credentials)) {
413 return NT_STATUS_UNSUCCESSFUL;
417 the schannel session key is now in creds.session_key
419 we no longer need the netlogon pipe open
421 dcerpc_pipe_close(p2);
423 memcpy(new_session_key, creds.session_key, 16);
429 do a schannel style bind on a dcerpc pipe. The username is usually
430 of the form HOSTNAME$ and the password is the domain trust password
432 NTSTATUS dcerpc_bind_auth_schannel(struct dcerpc_pipe *p,
433 const char *uuid, uint_t version,
435 const char *username,
436 const char *password)
441 status = gensec_client_start(p, &p->security_state.generic_state);
442 if (!NT_STATUS_IS_OK(status)) {
446 if (p->flags & DCERPC_SCHANNEL_BDC) {
447 chan_type = SEC_CHAN_BDC;
448 } else if (p->flags & DCERPC_SCHANNEL_WORKSTATION) {
449 chan_type = SEC_CHAN_WKSTA;
450 } else if (p->flags & DCERPC_SCHANNEL_DOMAIN) {
451 chan_type = SEC_CHAN_DOMAIN;
454 status = dcerpc_schannel_key(p, domain,
458 p->security_state.generic_state->user.schan_session_key);
459 if (!NT_STATUS_IS_OK(status)) {
460 DEBUG(1, ("Failed to fetch schannel session key: %s\n", nt_errstr(status)));
461 gensec_end(&p->security_state.generic_state);
465 status = gensec_set_username(p->security_state.generic_state, username);
466 if (!NT_STATUS_IS_OK(status)) {
467 DEBUG(1, ("Failed to set schannel username to %s: %s\n", username, nt_errstr(status)));
468 gensec_end(&p->security_state.generic_state);
472 status = gensec_set_domain(p->security_state.generic_state, domain);
473 if (!NT_STATUS_IS_OK(status)) {
474 DEBUG(1, ("Failed to set schannel domain to %s: %s\n", domain, nt_errstr(status)));
475 gensec_end(&p->security_state.generic_state);
479 status = gensec_start_mech_by_authtype(p->security_state.generic_state, DCERPC_AUTH_TYPE_SCHANNEL, dcerpc_auth_level(p));
481 if (!NT_STATUS_IS_OK(status)) {
482 DEBUG(1, ("Failed to start SCHANNEL GENSEC backend: %s\n", nt_errstr(status)));
483 gensec_end(&p->security_state.generic_state);
487 status = dcerpc_bind_auth3(p, DCERPC_AUTH_TYPE_SCHANNEL, dcerpc_auth_level(p),
490 if (!NT_STATUS_IS_OK(status)) {
491 DEBUG(1, ("Failed to bind to pipe with SCHANNEL: %s\n", nt_errstr(status)));
492 gensec_end(&p->security_state.generic_state);
500 static const struct gensec_security_ops gensec_dcerpc_schannel_security_ops = {
501 .name = "dcerpc_schannel",
502 .auth_type = DCERPC_AUTH_TYPE_SCHANNEL,
503 .client_start = dcerpc_schannel_client_start,
504 .server_start = dcerpc_schannel_server_start,
505 .update = dcerpc_schannel_update,
506 .seal_packet = dcerpc_schannel_seal_packet,
507 .sign_packet = dcerpc_schannel_sign_packet,
508 .check_packet = dcerpc_schannel_check_packet,
509 .unseal_packet = dcerpc_schannel_unseal_packet,
510 .session_key = dcerpc_schannel_session_key,
511 .session_info = dcerpc_schannel_session_info,
512 .sig_size = dcerpc_schannel_sig_size,
513 .end = dcerpc_schannel_end
516 NTSTATUS gensec_dcerpc_schannel_init(void)
519 ret = register_backend("gensec", &gensec_dcerpc_schannel_security_ops);
520 if (!NT_STATUS_IS_OK(ret)) {
521 DEBUG(0,("Failed to register '%s' gensec backend!\n",
522 gensec_dcerpc_schannel_security_ops.name));