source: trunk/server/source3/auth/auth.c

Last change on this file was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 17.9 KB
RevLine 
[745]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 "smbd/globals.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
81static NTSTATUS get_ntlm_challenge(struct auth_context *auth_context,
82 uint8_t chal[8])
83{
84 DATA_BLOB challenge = data_blob_null;
85 const char *challenge_set_by = NULL;
86 auth_methods *auth_method;
87
88 if (auth_context->challenge.length) {
89 DEBUG(5, ("get_ntlm_challenge (auth subsystem): returning previous challenge by module %s (normal)\n",
90 auth_context->challenge_set_by));
91 memcpy(chal, auth_context->challenge.data, 8);
92 return NT_STATUS_OK;
93 }
94
95 auth_context->challenge_may_be_modified = False;
96
97 for (auth_method = auth_context->auth_method_list; auth_method; auth_method = auth_method->next) {
98 if (auth_method->get_chal == NULL) {
99 DEBUG(5, ("auth_get_challenge: module %s did not want to specify a challenge\n", auth_method->name));
100 continue;
101 }
102
103 DEBUG(5, ("auth_get_challenge: getting challenge from module %s\n", auth_method->name));
104 if (challenge_set_by != NULL) {
105 DEBUG(1, ("auth_get_challenge: CONFIGURATION ERROR: authentication method %s has already specified a challenge. Challenge by %s ignored.\n",
106 challenge_set_by, auth_method->name));
107 continue;
108 }
109
110 challenge = auth_method->get_chal(auth_context, &auth_method->private_data,
111 auth_context);
112 if (!challenge.length) {
113 DEBUG(3, ("auth_get_challenge: getting challenge from authentication method %s FAILED.\n",
114 auth_method->name));
115 } else {
116 DEBUG(5, ("auth_get_challenge: successfully got challenge from module %s\n", auth_method->name));
117 auth_context->challenge = challenge;
118 challenge_set_by = auth_method->name;
119 auth_context->challenge_set_method = auth_method;
120 }
121 }
122
123 if (!challenge_set_by) {
124 uchar tmp[8];
125
126 generate_random_buffer(tmp, sizeof(tmp));
127 auth_context->challenge = data_blob_talloc(auth_context,
128 tmp, sizeof(tmp));
129
130 challenge_set_by = "random";
131 auth_context->challenge_may_be_modified = True;
132 }
133
134 DEBUG(5, ("auth_context challenge created by %s\n", challenge_set_by));
135 DEBUG(5, ("challenge is: \n"));
136 dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
137
138 SMB_ASSERT(auth_context->challenge.length == 8);
139
140 auth_context->challenge_set_by=challenge_set_by;
141
142 memcpy(chal, auth_context->challenge.data, 8);
143 return NT_STATUS_OK;
144}
145
146
147/**
148 * Check user is in correct domain (if required)
149 *
150 * @param user Only used to fill in the debug message
151 *
152 * @param domain The domain to be verified
153 *
154 * @return True if the user can connect with that domain,
155 * False otherwise.
156**/
157
158static bool check_domain_match(const char *user, const char *domain)
159{
160 /*
161 * If we aren't serving to trusted domains, we must make sure that
162 * the validation request comes from an account in the same domain
163 * as the Samba server
164 */
165
166 if (!lp_allow_trusted_domains() &&
167 !(strequal("", domain) ||
168 strequal(lp_workgroup(), domain) ||
169 is_myname(domain))) {
170 DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
171 return False;
172 } else {
173 return True;
174 }
175}
176
177/**
178 * Check a user's Plaintext, LM or NTLM password.
179 *
180 * Check a user's password, as given in the user_info struct and return various
181 * interesting details in the server_info struct.
182 *
183 * This function does NOT need to be in a become_root()/unbecome_root() pair
184 * as it makes the calls itself when needed.
185 *
186 * The return value takes precedence over the contents of the server_info
187 * struct. When the return is other than NT_STATUS_OK the contents
188 * of that structure is undefined.
189 *
190 * @param user_info Contains the user supplied components, including the passwords.
191 * Must be created with make_user_info() or one of its wrappers.
192 *
193 * @param auth_context Supplies the challenges and some other data.
194 * Must be created with make_auth_context(), and the challenges should be
195 * filled in, either at creation or by calling the challenge geneation
196 * function auth_get_challenge().
197 *
198 * @param server_info If successful, contains information about the authentication,
199 * including a struct samu struct describing the user.
200 *
201 * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
202 *
203 **/
204
205static NTSTATUS check_ntlm_password(const struct auth_context *auth_context,
206 const struct auth_usersupplied_info *user_info,
207 struct auth_serversupplied_info **server_info)
208{
209 /* if all the modules say 'not for me' this is reasonable */
210 NTSTATUS nt_status = NT_STATUS_NO_SUCH_USER;
211 const char *unix_username;
212 auth_methods *auth_method;
213 TALLOC_CTX *mem_ctx;
214
215 if (!user_info || !auth_context || !server_info)
216 return NT_STATUS_LOGON_FAILURE;
217
218 DEBUG(3, ("check_ntlm_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
219 user_info->client.domain_name, user_info->client.account_name, user_info->workstation_name));
220
221 DEBUG(3, ("check_ntlm_password: mapped user is: [%s]\\[%s]@[%s]\n",
222 user_info->mapped.domain_name, user_info->mapped.account_name, user_info->workstation_name));
223
224 if (auth_context->challenge.length != 8) {
225 DEBUG(0, ("check_ntlm_password: Invalid challenge stored for this auth context - cannot continue\n"));
226 return NT_STATUS_LOGON_FAILURE;
227 }
228
229 if (auth_context->challenge_set_by)
230 DEBUG(10, ("check_ntlm_password: auth_context challenge created by %s\n",
231 auth_context->challenge_set_by));
232
233 DEBUG(10, ("challenge is: \n"));
234 dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
235
236#ifdef DEBUG_PASSWORD
237 DEBUG(100, ("user_info has passwords of length %d and %d\n",
238 (int)user_info->password.response.lanman.length, (int)user_info->password.response.nt.length));
239 DEBUG(100, ("lm:\n"));
240 dump_data(100, user_info->password.response.lanman.data, user_info->password.response.lanman.length);
241 DEBUG(100, ("nt:\n"));
242 dump_data(100, user_info->password.response.nt.data, user_info->password.response.nt.length);
243#endif
244
245 /* This needs to be sorted: If it doesn't match, what should we do? */
246 if (!check_domain_match(user_info->client.account_name, user_info->mapped.domain_name))
247 return NT_STATUS_LOGON_FAILURE;
248
249 for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next) {
250 NTSTATUS result;
251
252 mem_ctx = talloc_init("%s authentication for user %s\\%s", auth_method->name,
253 user_info->mapped.domain_name, user_info->client.account_name);
254
255 result = auth_method->auth(auth_context, auth_method->private_data, mem_ctx, user_info, server_info);
256
257 /* check if the module did anything */
258 if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_NOT_IMPLEMENTED) ) {
259 DEBUG(10,("check_ntlm_password: %s had nothing to say\n", auth_method->name));
260 talloc_destroy(mem_ctx);
261 continue;
262 }
263
264 nt_status = result;
265
266 if (NT_STATUS_IS_OK(nt_status)) {
267 DEBUG(3, ("check_ntlm_password: %s authentication for user [%s] succeeded\n",
268 auth_method->name, user_info->client.account_name));
269 } else {
270 DEBUG(5, ("check_ntlm_password: %s authentication for user [%s] FAILED with error %s\n",
271 auth_method->name, user_info->client.account_name, nt_errstr(nt_status)));
272 }
273
274 talloc_destroy(mem_ctx);
275
276 if ( NT_STATUS_IS_OK(nt_status))
277 {
278 break;
279 }
280 }
281
282 /* successful authentication */
283
284 if (NT_STATUS_IS_OK(nt_status)) {
285 unix_username = (*server_info)->unix_name;
286 if (!(*server_info)->guest) {
287 /* We might not be root if we are an RPC call */
288 become_root();
289 nt_status = smb_pam_accountcheck(
290 unix_username,
291 smbd_server_conn->client_id.name);
292 unbecome_root();
293
294 if (NT_STATUS_IS_OK(nt_status)) {
295 DEBUG(5, ("check_ntlm_password: PAM Account for user [%s] succeeded\n",
296 unix_username));
297 } else {
298 DEBUG(3, ("check_ntlm_password: PAM Account for user [%s] FAILED with error %s\n",
299 unix_username, nt_errstr(nt_status)));
300 }
301 }
302
303 if (NT_STATUS_IS_OK(nt_status)) {
304 DEBUG((*server_info)->guest ? 5 : 2,
305 ("check_ntlm_password: %sauthentication for user [%s] -> [%s] -> [%s] succeeded\n",
306 (*server_info)->guest ? "guest " : "",
307 user_info->client.account_name,
308 user_info->mapped.account_name,
309 unix_username));
310 }
311
312 return nt_status;
313 }
314
315 /* failed authentication; check for guest lapping */
316
317 DEBUG(2, ("check_ntlm_password: Authentication for user [%s] -> [%s] FAILED with error %s\n",
318 user_info->client.account_name, user_info->mapped.account_name,
319 nt_errstr(nt_status)));
320 ZERO_STRUCTP(server_info);
321
322 return nt_status;
323}
324
325/***************************************************************************
326 Clear out a auth_context, and destroy the attached TALLOC_CTX
327***************************************************************************/
328
329static int auth_context_destructor(void *ptr)
330{
331 struct auth_context *ctx = talloc_get_type(ptr, struct auth_context);
332 struct auth_methods *am;
333
334
335 /* Free private data of context's authentication methods */
336 for (am = ctx->auth_method_list; am; am = am->next) {
337 TALLOC_FREE(am->private_data);
338 }
339
340 return 0;
341}
342
343/***************************************************************************
344 Make a auth_info struct
345***************************************************************************/
346
347static NTSTATUS make_auth_context(TALLOC_CTX *mem_ctx,
348 struct auth_context **auth_context)
349{
350 struct auth_context *ctx;
351
352 ctx = talloc_zero(mem_ctx, struct auth_context);
353 if (!ctx) {
354 DEBUG(0,("make_auth_context: talloc failed!\n"));
355 return NT_STATUS_NO_MEMORY;
356 }
357
358 ctx->check_ntlm_password = check_ntlm_password;
359 ctx->get_ntlm_challenge = get_ntlm_challenge;
360
361 talloc_set_destructor((TALLOC_CTX *)ctx, auth_context_destructor);
362
363 *auth_context = ctx;
364 return NT_STATUS_OK;
365}
366
367bool load_auth_module(struct auth_context *auth_context,
368 const char *module, auth_methods **ret)
369{
370 static bool initialised_static_modules = False;
371
372 struct auth_init_function_entry *entry;
373 char *module_name = smb_xstrdup(module);
374 char *module_params = NULL;
375 char *p;
376 bool good = False;
377
378 /* Initialise static modules if not done so yet */
379 if(!initialised_static_modules) {
380 static_init_auth;
381 initialised_static_modules = True;
382 }
383
384 DEBUG(5,("load_auth_module: Attempting to find an auth method to match %s\n",
385 module));
386
387 p = strchr(module_name, ':');
388 if (p) {
389 *p = 0;
390 module_params = p+1;
391 trim_char(module_params, ' ', ' ');
392 }
393
394 trim_char(module_name, ' ', ' ');
395
396 entry = auth_find_backend_entry(module_name);
397
398 if (entry == NULL) {
399 if (NT_STATUS_IS_OK(smb_probe_module("auth", module_name))) {
400 entry = auth_find_backend_entry(module_name);
401 }
402 }
403
404 if (entry != NULL) {
405 if (!NT_STATUS_IS_OK(entry->init(auth_context, module_params, ret))) {
406 DEBUG(0,("load_auth_module: auth method %s did not correctly init\n",
407 module_name));
408 } else {
409 DEBUG(5,("load_auth_module: auth method %s has a valid init\n",
410 module_name));
411 good = True;
412 }
413 } else {
414 DEBUG(0,("load_auth_module: can't find auth method %s!\n", module_name));
415 }
416
417 SAFE_FREE(module_name);
418 return good;
419}
420
421/***************************************************************************
422 Make a auth_info struct for the auth subsystem
423***************************************************************************/
424
425static NTSTATUS make_auth_context_text_list(TALLOC_CTX *mem_ctx,
426 struct auth_context **auth_context,
427 char **text_list)
428{
429 auth_methods *list = NULL;
430 auth_methods *t = NULL;
431 NTSTATUS nt_status;
432
433 if (!text_list) {
434 DEBUG(2,("make_auth_context_text_list: No auth method list!?\n"));
435 return NT_STATUS_UNSUCCESSFUL;
436 }
437
438 nt_status = make_auth_context(mem_ctx, auth_context);
439
440 if (!NT_STATUS_IS_OK(nt_status)) {
441 return nt_status;
442 }
443
444 for (;*text_list; text_list++) {
445 if (load_auth_module(*auth_context, *text_list, &t)) {
446 DLIST_ADD_END(list, t, auth_methods *);
447 }
448 }
449
450 (*auth_context)->auth_method_list = list;
451
452 return nt_status;
453}
454
455/***************************************************************************
456 Make a auth_context struct for the auth subsystem
457***************************************************************************/
458
459NTSTATUS make_auth_context_subsystem(TALLOC_CTX *mem_ctx,
460 struct auth_context **auth_context)
461{
462 char **auth_method_list = NULL;
463 NTSTATUS nt_status;
464
465 if (lp_auth_methods()
466 && !(auth_method_list = str_list_copy(talloc_tos(),
467 lp_auth_methods()))) {
468 return NT_STATUS_NO_MEMORY;
469 }
470
471 if (auth_method_list == NULL) {
472 switch (lp_security())
473 {
474 case SEC_DOMAIN:
475 DEBUG(5,("Making default auth method list for security=domain\n"));
476 auth_method_list = str_list_make_v3(
477 talloc_tos(), "guest sam winbind:ntdomain",
478 NULL);
479 break;
480 case SEC_SERVER:
481 DEBUG(5,("Making default auth method list for security=server\n"));
482 auth_method_list = str_list_make_v3(
483 talloc_tos(), "guest sam smbserver",
484 NULL);
485 break;
486 case SEC_USER:
487 if (lp_encrypted_passwords()) {
488 if ((lp_server_role() == ROLE_DOMAIN_PDC) || (lp_server_role() == ROLE_DOMAIN_BDC)) {
489 DEBUG(5,("Making default auth method list for DC, security=user, encrypt passwords = yes\n"));
490 auth_method_list = str_list_make_v3(
491 talloc_tos(),
492 "guest sam winbind:trustdomain",
493 NULL);
494 } else {
495 DEBUG(5,("Making default auth method list for standalone security=user, encrypt passwords = yes\n"));
496 auth_method_list = str_list_make_v3(
497 talloc_tos(), "guest sam",
498 NULL);
499 }
500 } else {
501 DEBUG(5,("Making default auth method list for security=user, encrypt passwords = no\n"));
502 auth_method_list = str_list_make_v3(
503 talloc_tos(), "guest unix", NULL);
504 }
505 break;
506 case SEC_SHARE:
507 if (lp_encrypted_passwords()) {
508 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = yes\n"));
509 auth_method_list = str_list_make_v3(
510 talloc_tos(), "guest sam", NULL);
511 } else {
512 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = no\n"));
513 auth_method_list = str_list_make_v3(
514 talloc_tos(), "guest unix", NULL);
515 }
516 break;
517 case SEC_ADS:
518 DEBUG(5,("Making default auth method list for security=ADS\n"));
519 auth_method_list = str_list_make_v3(
520 talloc_tos(), "guest sam winbind:ntdomain",
521 NULL);
522 break;
523 default:
524 DEBUG(5,("Unknown auth method!\n"));
525 return NT_STATUS_UNSUCCESSFUL;
526 }
527 } else {
528 DEBUG(5,("Using specified auth order\n"));
529 }
530
531 nt_status = make_auth_context_text_list(mem_ctx, auth_context,
532 auth_method_list);
533
534 TALLOC_FREE(auth_method_list);
535 return nt_status;
536}
537
538/***************************************************************************
539 Make a auth_info struct with a fixed challenge
540***************************************************************************/
541
542NTSTATUS make_auth_context_fixed(TALLOC_CTX *mem_ctx,
543 struct auth_context **auth_context,
544 uchar chal[8])
545{
546 NTSTATUS nt_status;
547 nt_status = make_auth_context_subsystem(mem_ctx, auth_context);
548 if (!NT_STATUS_IS_OK(nt_status)) {
549 return nt_status;
550 }
551
552 (*auth_context)->challenge = data_blob_talloc(*auth_context, chal, 8);
553 (*auth_context)->challenge_set_by = "fixed";
554 return nt_status;
555}
556
557
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