1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright 2018 Nexenta Systems, Inc. All rights reserved.
24 * Copyright 2021 RackTop Systems, Inc.
25 */
26
27 /*
28 * Utility functions to support the RPC interface library.
29 */
30
31 #include <stdio.h>
32 #include <stdarg.h>
33 #include <strings.h>
34 #include <unistd.h>
35 #include <netdb.h>
36 #include <stdlib.h>
37 #include <sys/time.h>
38 #include <sys/systm.h>
39 #include <note.h>
40 #include <syslog.h>
41
42 #include <smbsrv/libsmb.h>
43 #include <smbsrv/libsmbns.h>
44 #include <smbsrv/libmlsvc.h>
45 #include <smb/ntaccess.h>
46 #include <smbsrv/smbinfo.h>
47 #include <smbsrv/netrauth.h>
48 #include <libsmbrdr.h>
49 #include <lsalib.h>
50 #include <samlib.h>
51 #include <mlsvc.h>
52
53 static DWORD
54 mlsvc_join_rpc(smb_domainex_t *dxi,
55 char *admin_user, char *admin_pw,
56 char *machine_name, char *machine_pw);
57 static DWORD
58 mlsvc_join_noauth(smb_domainex_t *dxi,
59 char *machine_name, char *machine_pw);
60
61 /*
62 * This is called by smbd_dc_update just after we've learned about a
63 * new domain controller. Make sure we can authenticate with this DC.
64 */
65 DWORD
mlsvc_netlogon(char * server,char * domain)66 mlsvc_netlogon(char *server, char *domain)
67 {
68 DWORD status;
69
70 status = smb_netlogon_check(server, domain);
71 if (status != NT_STATUS_SUCCESS) {
72 syslog(LOG_NOTICE, "Failed to establish NETLOGON "
73 "credential chain with DC: %s (%s)", server,
74 xlate_nt_status(status));
75 syslog(LOG_NOTICE, "The machine account information on the "
76 "domain controller does not match the local storage.");
77 syslog(LOG_NOTICE, "To correct this, use 'smbadm join'");
78 }
79
80 return (status);
81 }
82
83 /*
84 * Join the specified domain. The method varies depending on whether
85 * we're using "secure join" (using an administrative account to join)
86 * or "unsecure join" (using a pre-created machine account). In the
87 * latter case, the machine account is created "by hand" before this
88 * machine attempts to join, and we just change the password from the
89 * (weak) default password for a new machine account to a random one.
90 *
91 * Returns NT status codes.
92 */
93 void
mlsvc_join(smb_joininfo_t * info,smb_joinres_t * res)94 mlsvc_join(smb_joininfo_t *info, smb_joinres_t *res)
95 {
96 static unsigned char zero_hash[SMBAUTH_HASH_SZ];
97 char machine_name[SMB_SAMACCT_MAXLEN];
98 char machine_pw[NETR_MACHINE_ACCT_PASSWD_MAX];
99 unsigned char passwd_hash[SMBAUTH_HASH_SZ];
100 char addrbuf[INET6_ADDRSTRLEN];
101 smb_domainex_t dxi;
102 smb_domain_t *di = &dxi.d_primary;
103 char *container;
104 char *username;
105 DWORD status;
106 int rc;
107
108 bzero(&dxi, sizeof (dxi));
109
110 if (info->container_name[0] != '\0')
111 container = info->container_name;
112 else
113 container = NULL;
114 if (info->domain_username[0] != '\0')
115 username = info->domain_username;
116 else
117 username = NULL;
118
119 /*
120 * Domain join support: AD (Kerberos+LDAP) or MS-RPC?
121 */
122 boolean_t ads_enabled = smb_config_get_ads_enable();
123
124 if (smb_getsamaccount(machine_name, sizeof (machine_name)) != 0) {
125 res->status = NT_STATUS_INVALID_COMPUTER_NAME;
126 return;
127 }
128
129 (void) smb_gen_random_passwd(machine_pw, sizeof (machine_pw));
130
131 /*
132 * Ensure that any previous membership of this domain has
133 * been cleared from the environment before we start. This
134 * will ensure that we don't attempt a NETLOGON_SAMLOGON
135 * when attempting to find the PDC.
136 */
137 (void) smb_config_setbool(SMB_CI_DOMAIN_MEMB, B_FALSE);
138
139 if (username != NULL) {
140 (void) smb_auth_ntlm_hash(info->domain_passwd, passwd_hash);
141 smb_ipc_set(username, passwd_hash);
142 syslog(LOG_INFO, "smbd: joining with user %s", username);
143 } else {
144 smb_ipc_set(MLSVC_ANON_USER, zero_hash);
145 syslog(LOG_INFO, "smbd: joining with anonymous");
146 }
147
148 /*
149 * Tentatively set the idmap domain to the one we're joining,
150 * so that the DC locator in idmap knows what to look for.
151 * Ditto the SMB server domain.
152 */
153 if (smb_config_set_idmap_domain(info->domain_name) != 0)
154 syslog(LOG_NOTICE, "Failed to set idmap domain name");
155 if (smb_config_refresh_idmap() != 0)
156 syslog(LOG_NOTICE, "Failed to refresh idmap service");
157 syslog(LOG_INFO, "smbd: set idmap domain %s", info->domain_name);
158
159 /* Clear DNS local (ADS) lookup cache. */
160 smb_ads_refresh(B_FALSE);
161
162 /*
163 * Locate a DC for this domain. Intentionally bypass the
164 * ddiscover service here because we're still joining.
165 * This also allows better reporting of any failures.
166 */
167 status = smb_ads_lookup_msdcs(info->domain_name, &dxi.d_dci);
168 if (status != NT_STATUS_SUCCESS) {
169 syslog(LOG_ERR,
170 "smbd: failed to locate AD server for domain %s (%s)",
171 info->domain_name, xlate_nt_status(status));
172 goto out;
173 }
174
175 /*
176 * Found a DC. Report what we found along with the return status
177 * so that admin will know which AD server we were talking to.
178 */
179 (void) strlcpy(res->dc_name, dxi.d_dci.dc_name, MAXHOSTNAMELEN);
180 if (smb_inet_ntop(&dxi.d_dci.dc_addr,
181 addrbuf, sizeof (addrbuf)) == NULL)
182 strcpy(addrbuf, "?");
183 syslog(LOG_INFO, "smbd: found AD server %s (%s)",
184 dxi.d_dci.dc_name, addrbuf);
185
186 /*
187 * Domain discovery needs to authenticate with the AD server.
188 * Disconnect any existing connection with the domain controller
189 * to make sure we won't use any prior authentication context
190 * our redirector might have.
191 */
192 mlsvc_disconnect(dxi.d_dci.dc_name);
193
194 /*
195 * Get the domain policy info (domain SID etc).
196 * Here too, bypass the smb_ddiscover_service.
197 */
198 status = smb_ddiscover_main(info->domain_name, &dxi);
199 if (status != NT_STATUS_SUCCESS) {
200 syslog(LOG_ERR,
201 "smbd: failed getting domain info for %s (%s)",
202 info->domain_name, xlate_nt_status(status));
203 goto out;
204 }
205 /*
206 * After a successful smbd_ddiscover_main() call
207 * we should call smb_domain_save() to update the
208 * data shown by smbadm list. Do that at the end,
209 * only if all goes well with joining the domain.
210 */
211
212 /*
213 * Log info about the domain from ddiscover
214 */
215 syslog(LOG_INFO, "smbd_join: domain FQN=%s", di->di_fqname);
216 syslog(LOG_INFO, "smbd_join: domain NBN=%s", di->di_nbname);
217 syslog(LOG_INFO, "smbd_join: domain SID=%s", di->di_sid);
218
219 /*
220 * Create or update our machine account on the DC.
221 * A non-null user means we do "secure join".
222 */
223 if (username != NULL) {
224 /*
225 * If enabled, try to join using AD Services.
226 */
227 status = NT_STATUS_UNSUCCESSFUL;
228 if (ads_enabled) {
229 syslog(LOG_INFO, "use_ads=true (LDAP join)");
230 res->join_err = smb_ads_join(di->di_fqname, container,
231 info->domain_username, info->domain_passwd,
232 machine_pw);
233 if (res->join_err == SMB_ADS_SUCCESS) {
234 status = NT_STATUS_SUCCESS;
235 }
236 } else {
237 syslog(LOG_INFO, "use_ads=false (RPC join)");
238
239 /*
240 * If ADS was disabled, join using RPC.
241 */
242 status = mlsvc_join_rpc(&dxi,
243 info->domain_username,
244 info->domain_passwd,
245 machine_name, machine_pw);
246 }
247
248 } else {
249 /*
250 * Doing "Unsecure join" (pre-created account)
251 */
252 status = mlsvc_join_noauth(&dxi, machine_name, machine_pw);
253 }
254
255 if (status != NT_STATUS_SUCCESS)
256 goto out;
257
258 /*
259 * Make sure we can authenticate using the
260 * (new, or updated) machine account.
261 */
262 (void) smb_auth_ntlm_hash(machine_pw, passwd_hash);
263 smb_ipc_set(machine_name, passwd_hash);
264 rc = smbrdr_logon(dxi.d_dci.dc_name, di->di_nbname, machine_name);
265 if (rc != 0) {
266 syslog(LOG_NOTICE, "Authenticate with "
267 "new/updated machine account: %s",
268 strerror(rc));
269 res->join_err = SMB_ADJOIN_ERR_AUTH_NETLOGON;
270 status = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
271 goto out;
272 }
273
274 /*
275 * Store the new machine account password, and
276 * SMB_CI_DOMAIN_MEMB etc.
277 */
278 rc = smb_setdomainprops(NULL, dxi.d_dci.dc_name, machine_pw);
279 if (rc != 0) {
280 syslog(LOG_NOTICE,
281 "Failed to save machine account password");
282 res->join_err = SMB_ADJOIN_ERR_STORE_PROPS;
283 status = NT_STATUS_INTERNAL_DB_ERROR;
284 goto out;
285 }
286
287 /*
288 * Update idmap config?
289 * Already set the domain_name above.
290 */
291
292 /*
293 * Save the SMB server config. Sets: SMB_CI_DOMAIN_*
294 * Should unify SMB vs idmap configs.
295 */
296 smb_config_setdomaininfo(di->di_nbname, di->di_fqname,
297 di->di_sid,
298 di->di_u.di_dns.ddi_forest,
299 di->di_u.di_dns.ddi_guid);
300 smb_ipc_commit();
301 smb_domain_save();
302
303 status = 0;
304
305 out:
306
307 if (status != 0) {
308 /*
309 * Undo the tentative domain settings.
310 */
311 (void) smb_config_set_idmap_domain("");
312 (void) smb_config_refresh_idmap();
313 smb_ipc_rollback();
314 }
315
316 /* Avoid leaving cleartext passwords around. */
317 bzero(machine_pw, sizeof (machine_pw));
318 bzero(passwd_hash, sizeof (passwd_hash));
319
320 res->status = status;
321 }
322
323 static DWORD
mlsvc_join_rpc(smb_domainex_t * dxi,char * admin_user,char * admin_pw,char * machine_name,char * machine_pw)324 mlsvc_join_rpc(smb_domainex_t *dxi,
325 char *admin_user, char *admin_pw,
326 char *machine_name, char *machine_pw)
327 {
328 mlsvc_handle_t samr_handle;
329 mlsvc_handle_t domain_handle;
330 mlsvc_handle_t user_handle;
331 smb_account_t ainfo;
332 char *server = dxi->d_dci.dc_name;
333 smb_domain_t *di = &dxi->d_primary;
334 DWORD account_flags;
335 DWORD rid;
336 DWORD status;
337 int rc;
338
339 /* Caller did smb_ipc_set() so we don't need the pw for now. */
340 _NOTE(ARGUNUSED(admin_pw));
341
342 rc = samr_open(server, di->di_nbname, admin_user,
343 MAXIMUM_ALLOWED, &samr_handle);
344 if (rc != 0) {
345 syslog(LOG_NOTICE, "sam_connect to server %s failed", server);
346 return (RPC_NT_SERVER_UNAVAILABLE);
347 }
348 /* have samr_handle */
349
350 status = samr_open_domain(&samr_handle, MAXIMUM_ALLOWED,
351 (struct samr_sid *)di->di_binsid, &domain_handle);
352 if (status != NT_STATUS_SUCCESS)
353 goto out_samr_handle;
354 /* have domain_handle */
355
356 account_flags = SAMR_AF_WORKSTATION_TRUST_ACCOUNT;
357 status = samr_create_user(&domain_handle, machine_name,
358 account_flags, &rid, &user_handle);
359 if (status == NT_STATUS_USER_EXISTS) {
360 status = samr_lookup_domain_names(&domain_handle,
361 machine_name, &ainfo);
362 if (status != NT_STATUS_SUCCESS)
363 goto out_domain_handle;
364 status = samr_open_user(&domain_handle, MAXIMUM_ALLOWED,
365 ainfo.a_rid, &user_handle);
366 }
367 if (status != NT_STATUS_SUCCESS) {
368 syslog(LOG_NOTICE,
369 "smbd: failed to open machine account (%s)",
370 xlate_nt_status(status));
371 goto out_domain_handle;
372 }
373
374 /*
375 * The account exists, and we have user_handle open
376 * on that account. Set the password and flags.
377 */
378
379 status = netr_set_user_password(&user_handle, machine_pw);
380 if (status != NT_STATUS_SUCCESS) {
381 syslog(LOG_NOTICE,
382 "smbd: failed to set machine account password (%s)",
383 xlate_nt_status(status));
384 goto out_user_handle;
385 }
386
387 account_flags |= SAMR_AF_DONT_EXPIRE_PASSWD;
388 status = netr_set_user_control(&user_handle, account_flags);
389 if (status != NT_STATUS_SUCCESS) {
390 syslog(LOG_NOTICE,
391 "Set machine account control flags: %s",
392 xlate_nt_status(status));
393 goto out_user_handle;
394 }
395
396 out_user_handle:
397 (void) samr_close_handle(&user_handle);
398 out_domain_handle:
399 (void) samr_close_handle(&domain_handle);
400 out_samr_handle:
401 (void) samr_close_handle(&samr_handle);
402
403 return (status);
404 }
405
406 /*
407 * Doing "Unsecure join" (using a pre-created machine account).
408 * All we need to do is change the password from the default
409 * to a random string.
410 *
411 * Note: this is a work in progres. Nexenta issue 11960
412 * (allow joining an AD domain using a pre-created computer account)
413 * It turns out that to change the machine account password,
414 * we need to use a different RPC call, performed over the
415 * NetLogon secure channel. (See netr_server_password_set2)
416 */
417 static DWORD
mlsvc_join_noauth(smb_domainex_t * dxi,char * machine_name,char * machine_pw)418 mlsvc_join_noauth(smb_domainex_t *dxi,
419 char *machine_name, char *machine_pw)
420 {
421 char old_pw[SMB_SAMACCT_MAXLEN];
422 DWORD status;
423
424 /*
425 * Compose the current (default) password for the
426 * pre-created machine account, which is just the
427 * account name in lower case, truncated to 14
428 * characters.
429 */
430 if (smb_gethostname(old_pw, sizeof (old_pw), SMB_CASE_LOWER) != 0)
431 return (NT_STATUS_INTERNAL_ERROR);
432 old_pw[14] = '\0';
433
434 status = netr_change_password(dxi->d_dci.dc_name, machine_name,
435 old_pw, machine_pw);
436 if (status != NT_STATUS_SUCCESS) {
437 syslog(LOG_NOTICE,
438 "Change machine account password: %s",
439 xlate_nt_status(status));
440 }
441 return (status);
442 }
443
444 void
mlsvc_disconnect(const char * server)445 mlsvc_disconnect(const char *server)
446 {
447 smbrdr_disconnect(server);
448 }
449
450 /*
451 * A few more helper functions for RPC services.
452 */
453
454 /*
455 * Check whether or not the specified user has administrator privileges,
456 * i.e. is a member of Domain Admins or Administrators.
457 * Returns true if the user is an administrator, otherwise returns false.
458 */
459 boolean_t
ndr_is_admin(ndr_xa_t * xa)460 ndr_is_admin(ndr_xa_t *xa)
461 {
462 smb_netuserinfo_t *ctx = xa->pipe->np_user;
463
464 return (ctx->ui_flags & SMB_ATF_ADMIN);
465 }
466
467 /*
468 * Check whether or not the specified user has power-user privileges,
469 * i.e. is a member of Domain Admins, Administrators or Power Users.
470 * This is typically required for operations such as managing shares.
471 * Returns true if the user is a power user, otherwise returns false.
472 */
473 boolean_t
ndr_is_poweruser(ndr_xa_t * xa)474 ndr_is_poweruser(ndr_xa_t *xa)
475 {
476 smb_netuserinfo_t *ctx = xa->pipe->np_user;
477
478 return ((ctx->ui_flags & SMB_ATF_ADMIN) ||
479 (ctx->ui_flags & SMB_ATF_POWERUSER));
480 }
481
482 int32_t
ndr_native_os(ndr_xa_t * xa)483 ndr_native_os(ndr_xa_t *xa)
484 {
485 smb_netuserinfo_t *ctx = xa->pipe->np_user;
486
487 return (ctx->ui_native_os);
488 }
489