Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 : Password and authentication handling
4 : Copyright (C) Andrew Bartlett 2001-2002
5 :
6 : This program is free software; you can redistribute it and/or modify
7 : it under the terms of the GNU General Public License as published by
8 : the Free Software Foundation; either version 3 of the License, or
9 : (at your option) any later version.
10 :
11 : This program is distributed in the hope that it will be useful,
12 : but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 : GNU General Public License for more details.
15 :
16 : You should have received a copy of the GNU General Public License
17 : along with this program. If not, see <http://www.gnu.org/licenses/>.
18 : */
19 :
20 : #include "includes.h"
21 : #include "auth.h"
22 : #include "../lib/tsocket/tsocket.h"
23 :
24 : #include "param/param.h"
25 : #include "../lib/messaging/messaging.h"
26 : #include "lib/global_contexts.h"
27 :
28 : #undef DBGC_CLASS
29 : #define DBGC_CLASS DBGC_AUTH
30 :
31 : static_decl_auth;
32 :
33 : static struct auth_init_function_entry *auth_backends = NULL;
34 :
35 : static struct auth_init_function_entry *auth_find_backend_entry(const char *name);
36 :
37 41142 : NTSTATUS smb_register_auth(int version, const char *name, auth_init_function init)
38 : {
39 41142 : struct auth_init_function_entry *entry = NULL;
40 :
41 41142 : if (version != AUTH_INTERFACE_VERSION) {
42 0 : DEBUG(0,("Can't register auth_method!\n"
43 : "You tried to register an auth module with AUTH_INTERFACE_VERSION %d, while this version of samba uses %d\n",
44 : version,AUTH_INTERFACE_VERSION));
45 0 : return NT_STATUS_OBJECT_TYPE_MISMATCH;
46 : }
47 :
48 41142 : if (!name || !init) {
49 0 : return NT_STATUS_INVALID_PARAMETER;
50 : }
51 :
52 41142 : DEBUG(5,("Attempting to register auth backend %s\n", name));
53 :
54 41142 : if (auth_find_backend_entry(name)) {
55 0 : DEBUG(0,("There already is an auth method registered with the name %s!\n", name));
56 0 : return NT_STATUS_OBJECT_NAME_COLLISION;
57 : }
58 :
59 41142 : entry = SMB_XMALLOC_P(struct auth_init_function_entry);
60 41142 : entry->name = smb_xstrdup(name);
61 41142 : entry->init = init;
62 :
63 41142 : DLIST_ADD(auth_backends, entry);
64 41142 : DEBUG(5,("Successfully added auth method '%s'\n", name));
65 41142 : return NT_STATUS_OK;
66 : }
67 :
68 67756 : static struct auth_init_function_entry *auth_find_backend_entry(const char *name)
69 : {
70 67756 : struct auth_init_function_entry *entry = auth_backends;
71 :
72 331043 : while(entry) {
73 245164 : if (strcmp(entry->name, name)==0) return entry;
74 218550 : entry = entry->next;
75 : }
76 :
77 41142 : return NULL;
78 : }
79 :
80 : /****************************************************************************
81 : Try to get a challenge out of the various authentication modules.
82 : Returns a const char of length 8 bytes.
83 : ****************************************************************************/
84 :
85 920 : NTSTATUS auth_get_ntlm_challenge(struct auth_context *auth_context,
86 : uint8_t chal[8])
87 : {
88 920 : if (auth_context->challenge.length) {
89 0 : DEBUG(5, ("get_ntlm_challenge (auth subsystem): returning previous challenge by module %s (normal)\n",
90 : auth_context->challenge_set_by));
91 0 : memcpy(chal, auth_context->challenge.data, 8);
92 0 : return NT_STATUS_OK;
93 : }
94 :
95 920 : auth_context->challenge = data_blob_talloc(auth_context, NULL, 8);
96 920 : if (auth_context->challenge.data == NULL) {
97 0 : DBG_WARNING("data_blob_talloc failed\n");
98 0 : return NT_STATUS_NO_MEMORY;
99 : }
100 920 : generate_random_buffer(
101 920 : auth_context->challenge.data, auth_context->challenge.length);
102 :
103 920 : auth_context->challenge_set_by = "random";
104 :
105 920 : memcpy(chal, auth_context->challenge.data, 8);
106 920 : return NT_STATUS_OK;
107 : }
108 :
109 :
110 : /**
111 : * Check user is in correct domain (if required)
112 : *
113 : * @param user Only used to fill in the debug message
114 : *
115 : * @param domain The domain to be verified
116 : *
117 : * @return True if the user can connect with that domain,
118 : * False otherwise.
119 : **/
120 :
121 901 : static bool check_domain_match(const char *user, const char *domain)
122 : {
123 : /*
124 : * If we aren't serving to trusted domains, we must make sure that
125 : * the validation request comes from an account in the same domain
126 : * as the Samba server
127 : */
128 :
129 901 : if (!lp_allow_trusted_domains() &&
130 0 : !(strequal("", domain) ||
131 0 : strequal(lp_workgroup(), domain) ||
132 0 : is_myname(domain))) {
133 0 : DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
134 0 : return False;
135 : } else {
136 901 : return True;
137 : }
138 : }
139 :
140 : /**
141 : * Check a user's Plaintext, LM or NTLM password.
142 : *
143 : * Check a user's password, as given in the user_info struct and return various
144 : * interesting details in the server_info struct.
145 : *
146 : * This function does NOT need to be in a become_root()/unbecome_root() pair
147 : * as it makes the calls itself when needed.
148 : *
149 : * The return value takes precedence over the contents of the server_info
150 : * struct. When the return is other than NT_STATUS_OK the contents
151 : * of that structure is undefined.
152 : *
153 : * @param user_info Contains the user supplied components, including the passwords.
154 : * Must be created with make_user_info() or one of its wrappers.
155 : *
156 : * @param auth_context Supplies the challenges and some other data.
157 : * Must be created with make_auth_context(), and the challenges should be
158 : * filled in, either at creation or by calling the challenge geneation
159 : * function auth_get_challenge().
160 : *
161 : * @param pserver_info If successful, contains information about the authentication,
162 : * including a struct samu struct describing the user.
163 : *
164 : * @param pauthoritative Indicates if the result should be treated as final
165 : * result.
166 : *
167 : * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
168 : *
169 : **/
170 901 : NTSTATUS auth_check_ntlm_password(TALLOC_CTX *mem_ctx,
171 : const struct auth_context *auth_context,
172 : const struct auth_usersupplied_info *user_info,
173 : struct auth_serversupplied_info **pserver_info,
174 : uint8_t *pauthoritative)
175 : {
176 : TALLOC_CTX *frame;
177 901 : const char *auth_method_name = "";
178 : /* if all the modules say 'not for me' this is reasonable */
179 901 : NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
180 : const char *unix_username;
181 : struct auth_methods *auth_method;
182 901 : struct auth_serversupplied_info *server_info = NULL;
183 901 : struct dom_sid sid = {0};
184 901 : struct imessaging_context *msg_ctx = NULL;
185 901 : struct loadparm_context *lp_ctx = NULL;
186 :
187 901 : if (user_info == NULL || auth_context == NULL || pserver_info == NULL) {
188 0 : return NT_STATUS_LOGON_FAILURE;
189 : }
190 :
191 901 : frame = talloc_stackframe();
192 :
193 901 : if (lp_auth_event_notification()) {
194 787 : lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
195 787 : msg_ctx = imessaging_client_init(
196 : frame, lp_ctx, global_event_context());
197 : }
198 :
199 901 : *pauthoritative = 1;
200 :
201 901 : DEBUG(3, ("check_ntlm_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
202 : user_info->client.domain_name, user_info->client.account_name, user_info->workstation_name));
203 :
204 901 : DEBUG(3, ("check_ntlm_password: mapped user is: [%s]\\[%s]@[%s]\n",
205 : user_info->mapped.domain_name, user_info->mapped.account_name, user_info->workstation_name));
206 :
207 901 : if (auth_context->challenge.length != 8) {
208 0 : DEBUG(0, ("check_ntlm_password: Invalid challenge stored for this auth context - cannot continue\n"));
209 0 : nt_status = NT_STATUS_LOGON_FAILURE;
210 0 : goto fail;
211 : }
212 :
213 901 : if (auth_context->challenge_set_by)
214 901 : DEBUG(10, ("check_ntlm_password: auth_context challenge created by %s\n",
215 : auth_context->challenge_set_by));
216 :
217 901 : DEBUG(10, ("challenge is: \n"));
218 901 : dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
219 :
220 : #ifdef DEBUG_PASSWORD
221 901 : DEBUG(100, ("user_info has passwords of length %d and %d\n",
222 : (int)user_info->password.response.lanman.length, (int)user_info->password.response.nt.length));
223 901 : DEBUG(100, ("lm:\n"));
224 901 : dump_data(100, user_info->password.response.lanman.data, user_info->password.response.lanman.length);
225 901 : DEBUG(100, ("nt:\n"));
226 901 : dump_data(100, user_info->password.response.nt.data, user_info->password.response.nt.length);
227 : #endif
228 :
229 : /* This needs to be sorted: If it doesn't match, what should we do? */
230 901 : if (!check_domain_match(user_info->client.account_name,
231 415 : user_info->mapped.domain_name)) {
232 0 : nt_status = NT_STATUS_LOGON_FAILURE;
233 0 : goto fail;
234 : }
235 :
236 1859 : for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next) {
237 :
238 1857 : auth_method_name = auth_method->name;
239 :
240 1857 : nt_status = auth_method->auth(auth_context,
241 : auth_method->private_data,
242 : talloc_tos(),
243 : user_info,
244 : &server_info);
245 :
246 1857 : if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_NOT_IMPLEMENTED)) {
247 899 : break;
248 : }
249 :
250 958 : DBG_DEBUG("%s had nothing to say\n", auth_method->name);
251 : }
252 :
253 901 : if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NOT_IMPLEMENTED)) {
254 2 : *pauthoritative = 0;
255 2 : nt_status = NT_STATUS_NO_SUCH_USER;
256 : }
257 :
258 901 : if (!NT_STATUS_IS_OK(nt_status)) {
259 118 : DBG_INFO("%s authentication for user [%s] FAILED with "
260 : "error %s, authoritative=%u\n",
261 : auth_method_name,
262 : user_info->client.account_name,
263 : nt_errstr(nt_status),
264 : *pauthoritative);
265 118 : goto fail;
266 : }
267 :
268 783 : DBG_NOTICE("%s authentication for user [%s] succeeded\n",
269 : auth_method_name, user_info->client.account_name);
270 :
271 783 : unix_username = server_info->unix_name;
272 :
273 : /* We skip doing this step if the caller asked us not to */
274 783 : if (!(user_info->flags & USER_INFO_INFO3_AND_NO_AUTHZ)
275 783 : && !(server_info->guest)) {
276 : const char *rhost;
277 :
278 599 : if (tsocket_address_is_inet(user_info->remote_host, "ip")) {
279 599 : rhost = tsocket_address_inet_addr_string(
280 272 : user_info->remote_host, talloc_tos());
281 599 : if (rhost == NULL) {
282 0 : nt_status = NT_STATUS_NO_MEMORY;
283 0 : goto fail;
284 : }
285 : } else {
286 0 : rhost = "127.0.0.1";
287 : }
288 :
289 : /* We might not be root if we are an RPC call */
290 599 : become_root();
291 599 : nt_status = smb_pam_accountcheck(unix_username, rhost);
292 599 : unbecome_root();
293 :
294 599 : if (NT_STATUS_IS_OK(nt_status)) {
295 599 : DEBUG(5, ("check_ntlm_password: PAM Account for user [%s] "
296 : "succeeded\n", unix_username));
297 : } else {
298 0 : DEBUG(3, ("check_ntlm_password: PAM Account for user [%s] "
299 : "FAILED with error %s\n",
300 : unix_username, nt_errstr(nt_status)));
301 : }
302 : }
303 :
304 783 : if (!NT_STATUS_IS_OK(nt_status)) {
305 0 : goto fail;
306 : }
307 :
308 783 : nt_status = get_user_sid_info3_and_extra(server_info->info3,
309 783 : &server_info->extra,
310 : &sid);
311 783 : if (!NT_STATUS_IS_OK(nt_status)) {
312 0 : sid = (struct dom_sid) {0};
313 : }
314 :
315 1210 : log_authentication_event(msg_ctx,
316 : lp_ctx,
317 : &auth_context->start_time,
318 : user_info,
319 : nt_status,
320 783 : server_info->info3->base.logon_domain.string,
321 783 : server_info->info3->base.account_name.string,
322 : &sid);
323 :
324 783 : DEBUG(server_info->guest ? 5 : 2,
325 : ("check_ntlm_password: %sauthentication for user "
326 : "[%s] -> [%s] -> [%s] succeeded\n",
327 : server_info->guest ? "guest " : "",
328 : user_info->client.account_name,
329 : user_info->mapped.account_name,
330 : unix_username));
331 :
332 783 : *pserver_info = talloc_move(mem_ctx, &server_info);
333 :
334 783 : TALLOC_FREE(frame);
335 783 : return NT_STATUS_OK;
336 :
337 118 : fail:
338 :
339 : /* failed authentication; check for guest lapping */
340 :
341 : /*
342 : * Please try not to change this string, it is probably in use
343 : * in audit logging tools
344 : */
345 118 : DEBUG(2, ("check_ntlm_password: Authentication for user "
346 : "[%s] -> [%s] FAILED with error %s, authoritative=%u\n",
347 : user_info->client.account_name, user_info->mapped.account_name,
348 : nt_errstr(nt_status), *pauthoritative));
349 :
350 118 : log_authentication_event(msg_ctx,
351 : lp_ctx,
352 : &auth_context->start_time,
353 : user_info,
354 : nt_status,
355 : NULL,
356 : NULL,
357 : NULL);
358 :
359 118 : ZERO_STRUCTP(pserver_info);
360 :
361 118 : TALLOC_FREE(frame);
362 :
363 118 : return nt_status;
364 : }
365 :
366 : /***************************************************************************
367 : Clear out a auth_context, and destroy the attached TALLOC_CTX
368 : ***************************************************************************/
369 :
370 14163 : static int auth_context_destructor(void *ptr)
371 : {
372 14163 : struct auth_context *ctx = talloc_get_type(ptr, struct auth_context);
373 : struct auth_methods *am;
374 :
375 :
376 : /* Free private data of context's authentication methods */
377 40776 : for (am = ctx->auth_method_list; am; am = am->next) {
378 26613 : TALLOC_FREE(am->private_data);
379 : }
380 :
381 14163 : return 0;
382 : }
383 :
384 : /***************************************************************************
385 : Make a auth_info struct
386 : ***************************************************************************/
387 :
388 14164 : static NTSTATUS make_auth_context(TALLOC_CTX *mem_ctx,
389 : struct auth_context **auth_context)
390 : {
391 : struct auth_context *ctx;
392 :
393 14164 : ctx = talloc_zero(mem_ctx, struct auth_context);
394 14164 : if (!ctx) {
395 0 : DEBUG(0,("make_auth_context: talloc failed!\n"));
396 0 : return NT_STATUS_NO_MEMORY;
397 : }
398 :
399 14164 : ctx->start_time = timeval_current();
400 :
401 14164 : talloc_set_destructor((TALLOC_CTX *)ctx, auth_context_destructor);
402 :
403 14164 : *auth_context = ctx;
404 14164 : return NT_STATUS_OK;
405 : }
406 :
407 26614 : static bool load_auth_module(
408 : struct auth_context *auth_context,
409 : const char *module,
410 : struct auth_methods **ret)
411 : {
412 : static bool initialised_static_modules = False;
413 :
414 : struct auth_init_function_entry *entry;
415 26614 : char *module_name = smb_xstrdup(module);
416 26614 : char *module_params = NULL;
417 : char *p;
418 26614 : bool good = False;
419 :
420 : /* Initialise static modules if not done so yet */
421 26614 : if(!initialised_static_modules) {
422 5149 : static_init_auth(NULL);
423 5149 : initialised_static_modules = True;
424 : }
425 :
426 26614 : DEBUG(5,("load_auth_module: Attempting to find an auth method to match %s\n",
427 : module));
428 :
429 26614 : p = strchr(module_name, ':');
430 26614 : if (p) {
431 0 : *p = 0;
432 0 : module_params = p+1;
433 0 : trim_char(module_params, ' ', ' ');
434 : }
435 :
436 26614 : trim_char(module_name, ' ', ' ');
437 :
438 26614 : entry = auth_find_backend_entry(module_name);
439 :
440 26614 : if (entry == NULL) {
441 0 : if (NT_STATUS_IS_OK(smb_probe_module("auth", module_name))) {
442 0 : entry = auth_find_backend_entry(module_name);
443 : }
444 : }
445 :
446 26614 : if (entry != NULL) {
447 26614 : if (!NT_STATUS_IS_OK(entry->init(auth_context, module_params, ret))) {
448 0 : DEBUG(0,("load_auth_module: auth method %s did not correctly init\n",
449 : module_name));
450 : } else {
451 26614 : DEBUG(5,("load_auth_module: auth method %s has a valid init\n",
452 : module_name));
453 26614 : good = True;
454 : }
455 : } else {
456 0 : DEBUG(0,("load_auth_module: can't find auth method %s!\n", module_name));
457 : }
458 :
459 26614 : SAFE_FREE(module_name);
460 26614 : return good;
461 : }
462 :
463 : /***************************************************************************
464 : Make a auth_info struct for the auth subsystem
465 : ***************************************************************************/
466 :
467 14164 : static NTSTATUS make_auth_context_text_list(TALLOC_CTX *mem_ctx,
468 : struct auth_context **auth_context,
469 : char **text_list)
470 : {
471 14164 : struct auth_methods *list = NULL;
472 14164 : struct auth_methods *t, *method = NULL;
473 : NTSTATUS nt_status;
474 :
475 14164 : if (!text_list) {
476 0 : DEBUG(2,("make_auth_context_text_list: No auth method list!?\n"));
477 0 : return NT_STATUS_UNSUCCESSFUL;
478 : }
479 :
480 14164 : nt_status = make_auth_context(mem_ctx, auth_context);
481 :
482 14164 : if (!NT_STATUS_IS_OK(nt_status)) {
483 0 : return nt_status;
484 : }
485 :
486 40778 : for (;*text_list; text_list++) {
487 26614 : if (load_auth_module(*auth_context, *text_list, &t)) {
488 26614 : DLIST_ADD_END(list, t);
489 : }
490 : }
491 :
492 14164 : (*auth_context)->auth_method_list = list;
493 :
494 : /* Look for the first module to provide a prepare_gensec and
495 : * make_auth4_context hook, and set that if provided */
496 30820 : for (method = (*auth_context)->auth_method_list; method; method = method->next) {
497 26614 : if (method->prepare_gensec && method->make_auth4_context) {
498 9958 : (*auth_context)->prepare_gensec = method->prepare_gensec;
499 9958 : (*auth_context)->make_auth4_context = method->make_auth4_context;
500 9958 : break;
501 : }
502 : }
503 14164 : return NT_STATUS_OK;
504 : }
505 :
506 14164 : static NTSTATUS make_auth_context_specific(TALLOC_CTX *mem_ctx,
507 : struct auth_context **auth_context,
508 : const char *methods)
509 : {
510 : char **method_list;
511 : NTSTATUS status;
512 :
513 14164 : method_list = str_list_make_v3(talloc_tos(), methods, NULL);
514 14164 : if (method_list == NULL) {
515 0 : return NT_STATUS_NO_MEMORY;
516 : }
517 :
518 14164 : status = make_auth_context_text_list(
519 : mem_ctx, auth_context, method_list);
520 :
521 14164 : TALLOC_FREE(method_list);
522 :
523 14164 : return status;
524 : }
525 :
526 : /***************************************************************************
527 : Make a auth_context struct for the auth subsystem
528 : ***************************************************************************/
529 :
530 14164 : NTSTATUS make_auth3_context_for_ntlm(TALLOC_CTX *mem_ctx,
531 : struct auth_context **auth_context)
532 : {
533 14164 : const char *methods = NULL;
534 14164 : const char *role = NULL;
535 :
536 14164 : switch (lp_server_role()) {
537 9958 : case ROLE_ACTIVE_DIRECTORY_DC:
538 9958 : role = "'active directory domain controller'";
539 9958 : methods = "samba4";
540 9958 : break;
541 4018 : case ROLE_DOMAIN_MEMBER:
542 4018 : role = "'domain member'";
543 4018 : methods = "anonymous sam winbind sam_ignoredomain";
544 4018 : break;
545 104 : case ROLE_DOMAIN_BDC:
546 : case ROLE_DOMAIN_PDC:
547 : case ROLE_IPA_DC:
548 104 : role = "'DC'";
549 104 : methods = "anonymous sam winbind sam_ignoredomain";
550 104 : break;
551 84 : case ROLE_STANDALONE:
552 84 : if (lp_encrypt_passwords()) {
553 84 : role = "'standalone server', encrypt passwords = yes";
554 84 : methods = "anonymous sam_ignoredomain";
555 : } else {
556 0 : role = "'standalone server', encrypt passwords = no";
557 0 : methods = "anonymous unix";
558 : }
559 84 : break;
560 0 : default:
561 0 : DEBUG(5,("Unknown auth method!\n"));
562 0 : return NT_STATUS_UNSUCCESSFUL;
563 : }
564 :
565 14164 : DBG_INFO("Making default auth method list for server role = %s\n",
566 : role);
567 :
568 14164 : return make_auth_context_specific(mem_ctx, auth_context, methods);
569 : }
570 :
571 0 : NTSTATUS make_auth3_context_for_netlogon(TALLOC_CTX *mem_ctx,
572 : struct auth_context **auth_context)
573 : {
574 0 : const char *methods = NULL;
575 :
576 0 : switch (lp_server_role()) {
577 0 : case ROLE_DOMAIN_BDC:
578 : case ROLE_DOMAIN_PDC:
579 : case ROLE_IPA_DC:
580 0 : methods = "sam_netlogon3 winbind";
581 0 : break;
582 :
583 0 : default:
584 0 : DBG_ERR("Invalid server role!\n");
585 0 : return NT_STATUS_INVALID_SERVER_STATE;
586 : }
587 :
588 0 : return make_auth_context_specific(mem_ctx, auth_context, methods);
589 : }
590 :
591 0 : NTSTATUS make_auth3_context_for_winbind(TALLOC_CTX *mem_ctx,
592 : struct auth_context **auth_context)
593 : {
594 0 : const char *methods = NULL;
595 :
596 0 : switch (lp_server_role()) {
597 0 : case ROLE_STANDALONE:
598 : case ROLE_DOMAIN_MEMBER:
599 : case ROLE_DOMAIN_BDC:
600 : case ROLE_DOMAIN_PDC:
601 : case ROLE_IPA_DC:
602 0 : methods = "sam";
603 0 : break;
604 0 : case ROLE_ACTIVE_DIRECTORY_DC:
605 0 : methods = "samba4:sam";
606 0 : break;
607 0 : default:
608 0 : DEBUG(5,("Unknown auth method!\n"));
609 0 : return NT_STATUS_UNSUCCESSFUL;
610 : }
611 :
612 0 : return make_auth_context_specific(mem_ctx, auth_context, methods);
613 : }
614 :
615 40 : bool auth3_context_set_challenge(
616 : struct auth_context *ctx,
617 : const uint8_t chal[8],
618 : const char *challenge_set_by)
619 : {
620 40 : ctx->challenge = data_blob_talloc(ctx, chal, 8);
621 40 : if (ctx->challenge.data == NULL) {
622 0 : return false;
623 : }
624 40 : ctx->challenge_set_by = talloc_strdup(ctx, challenge_set_by);
625 40 : if (ctx->challenge_set_by == NULL) {
626 0 : return false;
627 : }
628 40 : return true;
629 : }
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