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, DATA_BLOB *sig)
55 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
57 return schannel_unseal_packet(dce_schan_state->schannel_state, mem_ctx, data, length, sig);
60 static NTSTATUS dcerpc_schannel_check_packet(struct gensec_security *gensec_security,
62 const uint8_t *data, size_t length,
65 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
67 return schannel_check_packet(dce_schan_state->schannel_state, data, length, sig);
70 static NTSTATUS dcerpc_schannel_seal_packet(struct gensec_security *gensec_security,
72 uint8_t *data, size_t length,
75 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
77 return schannel_seal_packet(dce_schan_state->schannel_state, mem_ctx, data, length, sig);
80 static NTSTATUS dcerpc_schannel_sign_packet(struct gensec_security *gensec_security,
82 const uint8_t *data, size_t length,
85 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
87 return schannel_sign_packet(dce_schan_state->schannel_state, mem_ctx, data, length, sig);
90 static NTSTATUS dcerpc_schannel_session_key(struct gensec_security *gensec_security,
91 DATA_BLOB *session_key)
93 return NT_STATUS_NOT_IMPLEMENTED;
96 static NTSTATUS dcerpc_schannel_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
97 const DATA_BLOB in, DATA_BLOB *out)
99 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
101 struct schannel_bind bind_schannel;
102 struct schannel_bind_ack bind_schannel_ack;
103 const char *account_name;
104 *out = data_blob(NULL, 0);
106 switch (gensec_security->gensec_role) {
108 if (dce_schan_state->state != DCERPC_SCHANNEL_STATE_START) {
109 /* we could parse the bind ack, but we don't know what it is yet */
113 bind_schannel.unknown1 = 0;
115 /* to support this we'd need to have access to the full domain name */
116 bind_schannel.bind_type = 23;
117 bind_schannel.u.info23.domain = gensec_security->user.domain;
118 bind_schannel.u.info23.account_name = gensec_security->user.name;
119 bind_schannel.u.info23.dnsdomain = str_format_nbt_domain(out_mem_ctx, fulldomainname);
120 bind_schannel.u.info23.workstation = str_format_nbt_domain(out_mem_ctx, gensec_security->user.name);
122 bind_schannel.bind_type = 3;
123 bind_schannel.u.info3.domain = gensec_security->user.domain;
124 bind_schannel.u.info3.account_name = gensec_security->user.name;
127 status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel,
128 (ndr_push_flags_fn_t)ndr_push_schannel_bind);
129 if (!NT_STATUS_IS_OK(status)) {
130 DEBUG(3, ("Could not create schannel bind: %s\n",
135 dce_schan_state->state = DCERPC_SCHANNEL_STATE_UPDATE_1;
137 return NT_STATUS_MORE_PROCESSING_REQUIRED;
140 if (dce_schan_state->state != DCERPC_SCHANNEL_STATE_START) {
141 /* no third leg on this protocol */
142 return NT_STATUS_INVALID_PARAMETER;
145 /* parse the schannel startup blob */
146 status = ndr_pull_struct_blob(&in, out_mem_ctx, &bind_schannel,
147 (ndr_pull_flags_fn_t)ndr_pull_schannel_bind);
148 if (!NT_STATUS_IS_OK(status)) {
152 if (bind_schannel.bind_type == 23) {
153 account_name = bind_schannel.u.info23.account_name;
155 account_name = bind_schannel.u.info3.account_name;
158 /* pull the session key for this client */
159 status = schannel_fetch_session_key(out_mem_ctx, account_name, &dce_schan_state->creds);
160 if (!NT_STATUS_IS_OK(status)) {
161 DEBUG(3, ("Could not find session key for attempted schannel connection on %s: %s\n",
162 account_name, nt_errstr(status)));
166 dce_schan_state->account_name = talloc_strdup(dce_schan_state->mem_ctx, account_name);
168 /* start up the schannel server code */
169 status = schannel_start(&dce_schan_state->schannel_state,
170 dce_schan_state->creds.session_key, False);
171 if (!NT_STATUS_IS_OK(status)) {
172 DEBUG(3, ("Could not initialise schannel state for account %s: %s\n",
173 account_name, nt_errstr(status)));
177 bind_schannel_ack.unknown1 = 1;
178 bind_schannel_ack.unknown2 = 0;
179 bind_schannel_ack.unknown3 = 0x6c0000;
181 status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel_ack,
182 (ndr_push_flags_fn_t)ndr_push_schannel_bind_ack);
183 if (!NT_STATUS_IS_OK(status)) {
184 DEBUG(3, ("Could not return schannel bind ack for account %s: %s\n",
185 account_name, nt_errstr(status)));
189 dce_schan_state->state = DCERPC_SCHANNEL_STATE_UPDATE_1;
193 return NT_STATUS_INVALID_PARAMETER;
197 * Return the credentials of a logged on user, including session keys
200 * Only valid after a successful authentication
202 * May only be called once per authentication.
206 NTSTATUS dcerpc_schannel_session_info(struct gensec_security *gensec_security,
207 struct auth_session_info **session_info)
209 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
211 mem_ctx = talloc_init("dcerpc_schannel_start");
213 return NT_STATUS_NO_MEMORY;
216 (*session_info) = talloc_p(mem_ctx, struct auth_session_info);
217 if (*session_info == NULL) {
218 talloc_destroy(mem_ctx);
219 return NT_STATUS_NO_MEMORY;
222 ZERO_STRUCTP(*session_info);
223 (*session_info)->mem_ctx = mem_ctx;
224 (*session_info)->refcount = 1;
226 (*session_info)->workstation = talloc_strdup(mem_ctx, dce_schan_state->account_name);
227 if ((*session_info)->workstation == NULL) {
228 talloc_destroy(mem_ctx);
229 return NT_STATUS_NO_MEMORY;
236 * Return the struct creds_CredentialState.
238 * Make sure not to call this unless gensec is using schannel...
241 NTSTATUS dcerpc_schannel_creds(struct gensec_security *gensec_security,
243 struct creds_CredentialState **creds)
245 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
247 *creds = talloc_p(mem_ctx, struct creds_CredentialState);
249 return NT_STATUS_NO_MEMORY;
252 **creds = dce_schan_state->creds;
257 static NTSTATUS dcerpc_schannel_start(struct gensec_security *gensec_security)
259 struct dcerpc_schannel_state *dce_schan_state;
261 mem_ctx = talloc_init("dcerpc_schannel_start");
263 return NT_STATUS_NO_MEMORY;
266 dce_schan_state = talloc_p(mem_ctx, struct dcerpc_schannel_state);
267 if (!dce_schan_state) {
268 talloc_destroy(mem_ctx);
269 return NT_STATUS_NO_MEMORY;
272 dce_schan_state->mem_ctx = mem_ctx;
273 dce_schan_state->state = DCERPC_SCHANNEL_STATE_START;
276 gensec_security->private_data = dce_schan_state;
281 static NTSTATUS dcerpc_schannel_server_start(struct gensec_security *gensec_security)
285 status = dcerpc_schannel_start(gensec_security);
287 if (!NT_STATUS_IS_OK(status)) {
293 static NTSTATUS dcerpc_schannel_client_start(struct gensec_security *gensec_security)
296 struct dcerpc_schannel_state *dce_schan_state;
298 status = dcerpc_schannel_start(gensec_security);
299 if (!NT_STATUS_IS_OK(status)) {
302 dce_schan_state = gensec_security->private_data;
304 status = schannel_start(&dce_schan_state->schannel_state,
305 gensec_security->user.schan_session_key,
307 if (!NT_STATUS_IS_OK(status)) {
308 DEBUG(1, ("Failed to start schannel client\n"));
312 dump_data_pw("session key:\n", dce_schan_state->schannel_state->session_key, 16);
319 static void dcerpc_schannel_end(struct gensec_security *gensec_security)
321 struct dcerpc_schannel_state *dce_schan_state = gensec_security->private_data;
323 schannel_end(&dce_schan_state->schannel_state);
325 talloc_destroy(dce_schan_state->mem_ctx);
327 gensec_security->private_data = NULL;
332 get a schannel key using a netlogon challenge on a secondary pipe
334 static NTSTATUS dcerpc_schannel_key(struct dcerpc_pipe *p,
336 const char *username,
337 const char *password,
339 uint8_t new_session_key[16])
342 struct dcerpc_pipe *p2;
343 struct netr_ServerReqChallenge r;
344 struct netr_ServerAuthenticate2 a;
345 struct netr_Credential credentials1, credentials2, credentials3;
346 struct samr_Password mach_pwd;
347 struct creds_CredentialState creds;
348 const char *workgroup, *workstation;
349 uint32_t negotiate_flags;
351 if (p->flags & DCERPC_SCHANNEL_128) {
352 negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
354 negotiate_flags = NETLOGON_NEG_AUTH2_FLAGS;
357 workstation = username;
361 step 1 - establish a netlogon connection, with no authentication
363 status = dcerpc_secondary_connection(p, &p2,
364 DCERPC_NETLOGON_NAME,
365 DCERPC_NETLOGON_UUID,
366 DCERPC_NETLOGON_VERSION);
370 step 2 - request a netlogon challenge
372 r.in.server_name = talloc_asprintf(p->mem_ctx, "\\\\%s", dcerpc_server_name(p));
373 r.in.computer_name = workstation;
374 r.in.credentials = &credentials1;
375 r.out.credentials = &credentials2;
377 generate_random_buffer(credentials1.data, sizeof(credentials1.data));
379 status = dcerpc_netr_ServerReqChallenge(p2, p->mem_ctx, &r);
380 if (!NT_STATUS_IS_OK(status)) {
385 step 3 - authenticate on the netlogon pipe
387 E_md4hash(password, mach_pwd.hash);
388 creds_client_init(&creds, &credentials1, &credentials2, &mach_pwd, &credentials3,
391 a.in.server_name = r.in.server_name;
392 a.in.account_name = talloc_asprintf(p->mem_ctx, "%s$", workstation);
393 a.in.secure_channel_type = chan_type;
394 a.in.computer_name = workstation;
395 a.in.negotiate_flags = &negotiate_flags;
396 a.out.negotiate_flags = &negotiate_flags;
397 a.in.credentials = &credentials3;
398 a.out.credentials = &credentials3;
400 status = dcerpc_netr_ServerAuthenticate2(p2, p->mem_ctx, &a);
401 if (!NT_STATUS_IS_OK(status)) {
405 if (!creds_client_check(&creds, a.out.credentials)) {
406 return NT_STATUS_UNSUCCESSFUL;
410 the schannel session key is now in creds.session_key
412 we no longer need the netlogon pipe open
414 dcerpc_pipe_close(p2);
416 memcpy(new_session_key, creds.session_key, 16);
422 do a schannel style bind on a dcerpc pipe. The username is usually
423 of the form HOSTNAME$ and the password is the domain trust password
425 NTSTATUS dcerpc_bind_auth_schannel(struct dcerpc_pipe *p,
426 const char *uuid, uint_t version,
428 const char *username,
429 const char *password)
434 status = gensec_client_start(&p->security_state.generic_state);
435 if (!NT_STATUS_IS_OK(status)) {
439 if (p->flags & DCERPC_SCHANNEL_BDC) {
440 chan_type = SEC_CHAN_BDC;
441 } else if (p->flags & DCERPC_SCHANNEL_WORKSTATION) {
442 chan_type = SEC_CHAN_WKSTA;
443 } else if (p->flags & DCERPC_SCHANNEL_DOMAIN) {
444 chan_type = SEC_CHAN_DOMAIN;
447 status = dcerpc_schannel_key(p, domain,
451 p->security_state.generic_state->user.schan_session_key);
452 if (!NT_STATUS_IS_OK(status)) {
453 DEBUG(1, ("Failed to fetch schannel session key: %s\n", nt_errstr(status)));
454 gensec_end(&p->security_state.generic_state);
458 status = gensec_set_username(p->security_state.generic_state, username);
459 if (!NT_STATUS_IS_OK(status)) {
460 DEBUG(1, ("Failed to set schannel username to %s: %s\n", username, nt_errstr(status)));
461 gensec_end(&p->security_state.generic_state);
465 status = gensec_set_domain(p->security_state.generic_state, domain);
466 if (!NT_STATUS_IS_OK(status)) {
467 DEBUG(1, ("Failed to set schannel domain to %s: %s\n", domain, nt_errstr(status)));
468 gensec_end(&p->security_state.generic_state);
472 status = gensec_start_mech_by_authtype(p->security_state.generic_state, DCERPC_AUTH_TYPE_SCHANNEL);
474 if (!NT_STATUS_IS_OK(status)) {
475 DEBUG(1, ("Failed to start SCHANNEL GENSEC backend: %s\n", nt_errstr(status)));
476 gensec_end(&p->security_state.generic_state);
480 status = dcerpc_bind_auth3(p, DCERPC_AUTH_TYPE_SCHANNEL,
483 if (!NT_STATUS_IS_OK(status)) {
484 DEBUG(1, ("Failed to bind to pipe with SCHANNEL: %s\n", nt_errstr(status)));
485 gensec_end(&p->security_state.generic_state);
493 static const struct gensec_security_ops gensec_dcerpc_schannel_security_ops = {
494 .name = "dcerpc_schannel",
495 .auth_type = DCERPC_AUTH_TYPE_SCHANNEL,
496 .client_start = dcerpc_schannel_client_start,
497 .server_start = dcerpc_schannel_server_start,
498 .update = dcerpc_schannel_update,
499 .seal_packet = dcerpc_schannel_seal_packet,
500 .sign_packet = dcerpc_schannel_sign_packet,
501 .check_packet = dcerpc_schannel_check_packet,
502 .unseal_packet = dcerpc_schannel_unseal_packet,
503 .session_key = dcerpc_schannel_session_key,
504 .session_info = dcerpc_schannel_session_info,
505 .end = dcerpc_schannel_end
508 NTSTATUS gensec_dcerpc_schannel_init(void)
511 ret = register_backend("gensec", &gensec_dcerpc_schannel_security_ops);
512 if (!NT_STATUS_IS_OK(ret)) {
513 DEBUG(0,("Failed to register '%s' gensec backend!\n",
514 gensec_dcerpc_schannel_security_ops.name));