source: vendor/current/source3/auth/auth.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 16.4 KB
Line 
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#undef DBGC_CLASS
25#define DBGC_CLASS DBGC_AUTH
26
27static_decl_auth;
28
29static struct auth_init_function_entry *auth_backends = NULL;
30
31static struct auth_init_function_entry *auth_find_backend_entry(const char *name);
32
33NTSTATUS smb_register_auth(int version, const char *name, auth_init_function init)
34{
35 struct auth_init_function_entry *entry = auth_backends;
36
37 if (version != AUTH_INTERFACE_VERSION) {
38 DEBUG(0,("Can't register auth_method!\n"
39 "You tried to register an auth module with AUTH_INTERFACE_VERSION %d, while this version of samba uses %d\n",
40 version,AUTH_INTERFACE_VERSION));
41 return NT_STATUS_OBJECT_TYPE_MISMATCH;
42 }
43
44 if (!name || !init) {
45 return NT_STATUS_INVALID_PARAMETER;
46 }
47
48 DEBUG(5,("Attempting to register auth backend %s\n", name));
49
50 if (auth_find_backend_entry(name)) {
51 DEBUG(0,("There already is an auth method registered with the name %s!\n", name));
52 return NT_STATUS_OBJECT_NAME_COLLISION;
53 }
54
55 entry = SMB_XMALLOC_P(struct auth_init_function_entry);
56 entry->name = smb_xstrdup(name);
57 entry->init = init;
58
59 DLIST_ADD(auth_backends, entry);
60 DEBUG(5,("Successfully added auth method '%s'\n", name));
61 return NT_STATUS_OK;
62}
63
64static struct auth_init_function_entry *auth_find_backend_entry(const char *name)
65{
66 struct auth_init_function_entry *entry = auth_backends;
67
68 while(entry) {
69 if (strcmp(entry->name, name)==0) return entry;
70 entry = entry->next;
71 }
72
73 return NULL;
74}
75
76/****************************************************************************
77 Try to get a challenge out of the various authentication modules.
78 Returns a const char of length 8 bytes.
79****************************************************************************/
80
81NTSTATUS auth_get_ntlm_challenge(struct auth_context *auth_context,
82 uint8_t chal[8])
83{
84 uchar tmp[8];
85
86
87 if (auth_context->challenge.length) {
88 DEBUG(5, ("get_ntlm_challenge (auth subsystem): returning previous challenge by module %s (normal)\n",
89 auth_context->challenge_set_by));
90 memcpy(chal, auth_context->challenge.data, 8);
91 return NT_STATUS_OK;
92 }
93
94 generate_random_buffer(tmp, sizeof(tmp));
95 auth_context->challenge = data_blob_talloc(auth_context,
96 tmp, sizeof(tmp));
97
98 auth_context->challenge_set_by = "random";
99
100 memcpy(chal, auth_context->challenge.data, 8);
101 return NT_STATUS_OK;
102}
103
104
105/**
106 * Check user is in correct domain (if required)
107 *
108 * @param user Only used to fill in the debug message
109 *
110 * @param domain The domain to be verified
111 *
112 * @return True if the user can connect with that domain,
113 * False otherwise.
114**/
115
116static bool check_domain_match(const char *user, const char *domain)
117{
118 /*
119 * If we aren't serving to trusted domains, we must make sure that
120 * the validation request comes from an account in the same domain
121 * as the Samba server
122 */
123
124 if (!lp_allow_trusted_domains() &&
125 !(strequal("", domain) ||
126 strequal(lp_workgroup(), domain) ||
127 is_myname(domain))) {
128 DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
129 return False;
130 } else {
131 return True;
132 }
133}
134
135/**
136 * Check a user's Plaintext, LM or NTLM password.
137 *
138 * Check a user's password, as given in the user_info struct and return various
139 * interesting details in the server_info struct.
140 *
141 * This function does NOT need to be in a become_root()/unbecome_root() pair
142 * as it makes the calls itself when needed.
143 *
144 * The return value takes precedence over the contents of the server_info
145 * struct. When the return is other than NT_STATUS_OK the contents
146 * of that structure is undefined.
147 *
148 * @param user_info Contains the user supplied components, including the passwords.
149 * Must be created with make_user_info() or one of its wrappers.
150 *
151 * @param auth_context Supplies the challenges and some other data.
152 * Must be created with make_auth_context(), and the challenges should be
153 * filled in, either at creation or by calling the challenge geneation
154 * function auth_get_challenge().
155 *
156 * @param server_info If successful, contains information about the authentication,
157 * including a struct samu struct describing the user.
158 *
159 * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
160 *
161 **/
162
163NTSTATUS auth_check_ntlm_password(TALLOC_CTX *mem_ctx,
164 const struct auth_context *auth_context,
165 const struct auth_usersupplied_info *user_info,
166 struct auth_serversupplied_info **pserver_info)
167{
168 /* if all the modules say 'not for me' this is reasonable */
169 NTSTATUS nt_status = NT_STATUS_NO_SUCH_USER;
170 const char *unix_username;
171 auth_methods *auth_method;
172
173 if (user_info == NULL || auth_context == NULL || pserver_info == NULL) {
174 return NT_STATUS_LOGON_FAILURE;
175 }
176
177 DEBUG(3, ("check_ntlm_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
178 user_info->client.domain_name, user_info->client.account_name, user_info->workstation_name));
179
180 DEBUG(3, ("check_ntlm_password: mapped user is: [%s]\\[%s]@[%s]\n",
181 user_info->mapped.domain_name, user_info->mapped.account_name, user_info->workstation_name));
182
183 if (auth_context->challenge.length != 8) {
184 DEBUG(0, ("check_ntlm_password: Invalid challenge stored for this auth context - cannot continue\n"));
185 return NT_STATUS_LOGON_FAILURE;
186 }
187
188 if (auth_context->challenge_set_by)
189 DEBUG(10, ("check_ntlm_password: auth_context challenge created by %s\n",
190 auth_context->challenge_set_by));
191
192 DEBUG(10, ("challenge is: \n"));
193 dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
194
195#ifdef DEBUG_PASSWORD
196 DEBUG(100, ("user_info has passwords of length %d and %d\n",
197 (int)user_info->password.response.lanman.length, (int)user_info->password.response.nt.length));
198 DEBUG(100, ("lm:\n"));
199 dump_data(100, user_info->password.response.lanman.data, user_info->password.response.lanman.length);
200 DEBUG(100, ("nt:\n"));
201 dump_data(100, user_info->password.response.nt.data, user_info->password.response.nt.length);
202#endif
203
204 /* This needs to be sorted: If it doesn't match, what should we do? */
205 if (!check_domain_match(user_info->client.account_name, user_info->mapped.domain_name))
206 return NT_STATUS_LOGON_FAILURE;
207
208 for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next) {
209 struct auth_serversupplied_info *server_info;
210 TALLOC_CTX *tmp_ctx;
211 NTSTATUS result;
212
213 if (user_info->flags & USER_INFO_LOCAL_SAM_ONLY
214 && !(auth_method->flags & AUTH_METHOD_LOCAL_SAM)) {
215 continue;
216 }
217
218 tmp_ctx = talloc_named(mem_ctx,
219 0,
220 "%s authentication for user %s\\%s",
221 auth_method->name,
222 user_info->mapped.domain_name,
223 user_info->client.account_name);
224
225 result = auth_method->auth(auth_context,
226 auth_method->private_data,
227 tmp_ctx,
228 user_info,
229 &server_info);
230
231 /* check if the module did anything */
232 if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_NOT_IMPLEMENTED) ) {
233 DEBUG(10,("check_ntlm_password: %s had nothing to say\n", auth_method->name));
234 TALLOC_FREE(tmp_ctx);
235 if (user_info->flags & USER_INFO_LOCAL_SAM_ONLY) {
236 /* we don't expose the NT_STATUS_NOT_IMPLEMENTED
237 * internals, except when the caller is only probing
238 * one method, as they may do the fallback
239 */
240 nt_status = result;
241 }
242 continue;
243 }
244
245 nt_status = result;
246
247 if (NT_STATUS_IS_OK(nt_status)) {
248 DEBUG(3, ("check_ntlm_password: %s authentication for user [%s] succeeded\n",
249 auth_method->name, user_info->client.account_name));
250 } else {
251 DEBUG(5, ("check_ntlm_password: %s authentication for user [%s] FAILED with error %s\n",
252 auth_method->name, user_info->client.account_name, nt_errstr(nt_status)));
253 }
254
255 if (NT_STATUS_IS_OK(nt_status)) {
256 *pserver_info = talloc_steal(mem_ctx, server_info);
257 TALLOC_FREE(tmp_ctx);
258 break;
259 }
260
261 TALLOC_FREE(tmp_ctx);
262 }
263
264 /* successful authentication */
265
266 if (NT_STATUS_IS_OK(nt_status)) {
267 unix_username = (*pserver_info)->unix_name;
268
269 /* We skip doing this step if the caller asked us not to */
270 if (!(user_info->flags & USER_INFO_INFO3_AND_NO_AUTHZ)
271 && !(*pserver_info)->guest) {
272 const char *rhost;
273
274 if (tsocket_address_is_inet(user_info->remote_host, "ip")) {
275 rhost = tsocket_address_inet_addr_string(user_info->remote_host,
276 talloc_tos());
277 if (rhost == NULL) {
278 return NT_STATUS_NO_MEMORY;
279 }
280 } else {
281 rhost = "127.0.0.1";
282 }
283
284 /* We might not be root if we are an RPC call */
285 become_root();
286 nt_status = smb_pam_accountcheck(unix_username,
287 rhost);
288 unbecome_root();
289
290 if (NT_STATUS_IS_OK(nt_status)) {
291 DEBUG(5, ("check_ntlm_password: PAM Account for user [%s] succeeded\n",
292 unix_username));
293 } else {
294 DEBUG(3, ("check_ntlm_password: PAM Account for user [%s] FAILED with error %s\n",
295 unix_username, nt_errstr(nt_status)));
296 }
297 }
298
299 if (NT_STATUS_IS_OK(nt_status)) {
300 DEBUG((*pserver_info)->guest ? 5 : 2,
301 ("check_ntlm_password: %sauthentication for user [%s] -> [%s] -> [%s] succeeded\n",
302 (*pserver_info)->guest ? "guest " : "",
303 user_info->client.account_name,
304 user_info->mapped.account_name,
305 unix_username));
306 }
307
308 return nt_status;
309 }
310
311 /* failed authentication; check for guest lapping */
312
313 DEBUG(2, ("check_ntlm_password: Authentication for user [%s] -> [%s] FAILED with error %s\n",
314 user_info->client.account_name, user_info->mapped.account_name,
315 nt_errstr(nt_status)));
316 ZERO_STRUCTP(pserver_info);
317
318 return nt_status;
319}
320
321/***************************************************************************
322 Clear out a auth_context, and destroy the attached TALLOC_CTX
323***************************************************************************/
324
325static int auth_context_destructor(void *ptr)
326{
327 struct auth_context *ctx = talloc_get_type(ptr, struct auth_context);
328 struct auth_methods *am;
329
330
331 /* Free private data of context's authentication methods */
332 for (am = ctx->auth_method_list; am; am = am->next) {
333 TALLOC_FREE(am->private_data);
334 }
335
336 return 0;
337}
338
339/***************************************************************************
340 Make a auth_info struct
341***************************************************************************/
342
343static NTSTATUS make_auth_context(TALLOC_CTX *mem_ctx,
344 struct auth_context **auth_context)
345{
346 struct auth_context *ctx;
347
348 ctx = talloc_zero(mem_ctx, struct auth_context);
349 if (!ctx) {
350 DEBUG(0,("make_auth_context: talloc failed!\n"));
351 return NT_STATUS_NO_MEMORY;
352 }
353
354 talloc_set_destructor((TALLOC_CTX *)ctx, auth_context_destructor);
355
356 *auth_context = ctx;
357 return NT_STATUS_OK;
358}
359
360bool load_auth_module(struct auth_context *auth_context,
361 const char *module, auth_methods **ret)
362{
363 static bool initialised_static_modules = False;
364
365 struct auth_init_function_entry *entry;
366 char *module_name = smb_xstrdup(module);
367 char *module_params = NULL;
368 char *p;
369 bool good = False;
370
371 /* Initialise static modules if not done so yet */
372 if(!initialised_static_modules) {
373 static_init_auth;
374 initialised_static_modules = True;
375 }
376
377 DEBUG(5,("load_auth_module: Attempting to find an auth method to match %s\n",
378 module));
379
380 p = strchr(module_name, ':');
381 if (p) {
382 *p = 0;
383 module_params = p+1;
384 trim_char(module_params, ' ', ' ');
385 }
386
387 trim_char(module_name, ' ', ' ');
388
389 entry = auth_find_backend_entry(module_name);
390
391 if (entry == NULL) {
392 if (NT_STATUS_IS_OK(smb_probe_module("auth", module_name))) {
393 entry = auth_find_backend_entry(module_name);
394 }
395 }
396
397 if (entry != NULL) {
398 if (!NT_STATUS_IS_OK(entry->init(auth_context, module_params, ret))) {
399 DEBUG(0,("load_auth_module: auth method %s did not correctly init\n",
400 module_name));
401 } else {
402 DEBUG(5,("load_auth_module: auth method %s has a valid init\n",
403 module_name));
404 good = True;
405 }
406 } else {
407 DEBUG(0,("load_auth_module: can't find auth method %s!\n", module_name));
408 }
409
410 SAFE_FREE(module_name);
411 return good;
412}
413
414/***************************************************************************
415 Make a auth_info struct for the auth subsystem
416***************************************************************************/
417
418static NTSTATUS make_auth_context_text_list(TALLOC_CTX *mem_ctx,
419 struct auth_context **auth_context,
420 char **text_list)
421{
422 auth_methods *list = NULL;
423 auth_methods *t, *method = NULL;
424 NTSTATUS nt_status;
425
426 if (!text_list) {
427 DEBUG(2,("make_auth_context_text_list: No auth method list!?\n"));
428 return NT_STATUS_UNSUCCESSFUL;
429 }
430
431 nt_status = make_auth_context(mem_ctx, auth_context);
432
433 if (!NT_STATUS_IS_OK(nt_status)) {
434 return nt_status;
435 }
436
437 for (;*text_list; text_list++) {
438 if (load_auth_module(*auth_context, *text_list, &t)) {
439 DLIST_ADD_END(list, t);
440 }
441 }
442
443 (*auth_context)->auth_method_list = list;
444
445 /* Look for the first module to provide a prepare_gensec and
446 * make_auth4_context hook, and set that if provided */
447 for (method = (*auth_context)->auth_method_list; method; method = method->next) {
448 if (method->prepare_gensec && method->make_auth4_context) {
449 (*auth_context)->prepare_gensec = method->prepare_gensec;
450 (*auth_context)->make_auth4_context = method->make_auth4_context;
451 break;
452 }
453 }
454 return NT_STATUS_OK;
455}
456
457/***************************************************************************
458 Make a auth_context struct for the auth subsystem
459***************************************************************************/
460
461NTSTATUS make_auth_context_subsystem(TALLOC_CTX *mem_ctx,
462 struct auth_context **auth_context)
463{
464 char **auth_method_list = NULL;
465 NTSTATUS nt_status;
466
467 if (lp_auth_methods()
468 && !(auth_method_list = str_list_copy(talloc_tos(),
469 lp_auth_methods()))) {
470 return NT_STATUS_NO_MEMORY;
471 }
472
473 if (auth_method_list == NULL) {
474 switch (lp_server_role())
475 {
476 case ROLE_DOMAIN_MEMBER:
477 DEBUG(5,("Making default auth method list for server role = 'domain member'\n"));
478 auth_method_list = str_list_make_v3(
479 talloc_tos(), "guest sam winbind:ntdomain",
480 NULL);
481 break;
482 case ROLE_DOMAIN_BDC:
483 case ROLE_DOMAIN_PDC:
484 DEBUG(5,("Making default auth method list for DC\n"));
485 auth_method_list = str_list_make_v3(
486 talloc_tos(),
487 "guest sam winbind:trustdomain",
488 NULL);
489 break;
490 case ROLE_STANDALONE:
491 DEBUG(5,("Making default auth method list for server role = 'standalone server', encrypt passwords = yes\n"));
492 if (lp_encrypt_passwords()) {
493 auth_method_list = str_list_make_v3(
494 talloc_tos(), "guest sam",
495 NULL);
496 } else {
497 DEBUG(5,("Making default auth method list for server role = 'standalone server', encrypt passwords = no\n"));
498 auth_method_list = str_list_make_v3(
499 talloc_tos(), "guest unix", NULL);
500 }
501 break;
502 case ROLE_ACTIVE_DIRECTORY_DC:
503 DEBUG(5,("Making default auth method list for server role = 'active directory domain controller'\n"));
504 auth_method_list = str_list_make_v3(
505 talloc_tos(),
506 "samba4",
507 NULL);
508 break;
509 default:
510 DEBUG(5,("Unknown auth method!\n"));
511 return NT_STATUS_UNSUCCESSFUL;
512 }
513 } else {
514 DEBUG(5,("Using specified auth order\n"));
515 }
516
517 nt_status = make_auth_context_text_list(mem_ctx, auth_context,
518 auth_method_list);
519
520 TALLOC_FREE(auth_method_list);
521 return nt_status;
522}
523
524/***************************************************************************
525 Make a auth_info struct with a fixed challenge
526***************************************************************************/
527
528NTSTATUS make_auth_context_fixed(TALLOC_CTX *mem_ctx,
529 struct auth_context **auth_context,
530 uchar chal[8])
531{
532 NTSTATUS nt_status;
533 nt_status = make_auth_context_subsystem(mem_ctx, auth_context);
534 if (!NT_STATUS_IS_OK(nt_status)) {
535 return nt_status;
536 }
537
538 (*auth_context)->challenge = data_blob_talloc(*auth_context, chal, 8);
539 (*auth_context)->challenge_set_by = "fixed";
540 return nt_status;
541}
542
543
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