source: branches/samba-3.0/source/auth/auth.c

Last change on this file was 134, checked in by Paul Smedley, 17 years ago

Update source to 3.0.29
File size: 17.8 KB
RevLine 
[134]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 2 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, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19*/
20
21#include "includes.h"
22
23#undef DBGC_CLASS
24#define DBGC_CLASS DBGC_AUTH
25
26static_decl_auth;
27
28static struct auth_init_function_entry *backends = NULL;
29
30static struct auth_init_function_entry *auth_find_backend_entry(const char *name);
31
32NTSTATUS smb_register_auth(int version, const char *name, auth_init_function init)
33{
34 struct auth_init_function_entry *entry = backends;
35
36 if (version != AUTH_INTERFACE_VERSION) {
37 DEBUG(0,("Can't register auth_method!\n"
38 "You tried to register an auth module with AUTH_INTERFACE_VERSION %d, while this version of samba uses %d\n",
39 version,AUTH_INTERFACE_VERSION));
40 return NT_STATUS_OBJECT_TYPE_MISMATCH;
41 }
42
43 if (!name || !init) {
44 return NT_STATUS_INVALID_PARAMETER;
45 }
46
47 DEBUG(5,("Attempting to register auth backend %s\n", name));
48
49 if (auth_find_backend_entry(name)) {
50 DEBUG(0,("There already is an auth method registered with the name %s!\n", name));
51 return NT_STATUS_OBJECT_NAME_COLLISION;
52 }
53
54 entry = SMB_XMALLOC_P(struct auth_init_function_entry);
55 entry->name = smb_xstrdup(name);
56 entry->init = init;
57
58 DLIST_ADD(backends, entry);
59 DEBUG(5,("Successfully added auth method '%s'\n", name));
60 return NT_STATUS_OK;
61}
62
63static struct auth_init_function_entry *auth_find_backend_entry(const char *name)
64{
65 struct auth_init_function_entry *entry = backends;
66
67 while(entry) {
68 if (strcmp(entry->name, name)==0) return entry;
69 entry = entry->next;
70 }
71
72 return NULL;
73}
74
75/****************************************************************************
76 Try to get a challenge out of the various authentication modules.
77 Returns a const char of length 8 bytes.
78****************************************************************************/
79
80static const uint8 *get_ntlm_challenge(struct auth_context *auth_context)
81{
82 DATA_BLOB challenge = data_blob(NULL, 0);
83 const char *challenge_set_by = NULL;
84 auth_methods *auth_method;
85 TALLOC_CTX *mem_ctx;
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 return auth_context->challenge.data;
91 }
92
93 auth_context->challenge_may_be_modified = False;
94
95 for (auth_method = auth_context->auth_method_list; auth_method; auth_method = auth_method->next) {
96 if (auth_method->get_chal == NULL) {
97 DEBUG(5, ("auth_get_challenge: module %s did not want to specify a challenge\n", auth_method->name));
98 continue;
99 }
100
101 DEBUG(5, ("auth_get_challenge: getting challenge from module %s\n", auth_method->name));
102 if (challenge_set_by != NULL) {
103 DEBUG(1, ("auth_get_challenge: CONFIGURATION ERROR: authentication method %s has already specified a challenge. Challenge by %s ignored.\n",
104 challenge_set_by, auth_method->name));
105 continue;
106 }
107
108 mem_ctx = talloc_init("auth_get_challenge for module %s", auth_method->name);
109 if (!mem_ctx) {
110 smb_panic("talloc_init() failed!");
111 }
112
113 challenge = auth_method->get_chal(auth_context, &auth_method->private_data, mem_ctx);
114 if (!challenge.length) {
115 DEBUG(3, ("auth_get_challenge: getting challenge from authentication method %s FAILED.\n",
116 auth_method->name));
117 } else {
118 DEBUG(5, ("auth_get_challenge: successfully got challenge from module %s\n", auth_method->name));
119 auth_context->challenge = challenge;
120 challenge_set_by = auth_method->name;
121 auth_context->challenge_set_method = auth_method;
122 }
123 talloc_destroy(mem_ctx);
124 }
125
126 if (!challenge_set_by) {
127 uchar chal[8];
128
129 generate_random_buffer(chal, sizeof(chal));
130 auth_context->challenge = data_blob_talloc(auth_context->mem_ctx,
131 chal, sizeof(chal));
132
133 challenge_set_by = "random";
134 auth_context->challenge_may_be_modified = True;
135 }
136
137 DEBUG(5, ("auth_context challenge created by %s\n", challenge_set_by));
138 DEBUG(5, ("challenge is: \n"));
139 dump_data(5, (const char *)auth_context->challenge.data, auth_context->challenge.length);
140
141 SMB_ASSERT(auth_context->challenge.length == 8);
142
143 auth_context->challenge_set_by=challenge_set_by;
144
145 return auth_context->challenge.data;
146}
147
148
149/**
150 * Check user is in correct domain (if required)
151 *
152 * @param user Only used to fill in the debug message
153 *
154 * @param domain The domain to be verified
155 *
156 * @return True if the user can connect with that domain,
157 * False otherwise.
158**/
159
160static BOOL check_domain_match(const char *user, const char *domain)
161{
162 /*
163 * If we aren't serving to trusted domains, we must make sure that
164 * the validation request comes from an account in the same domain
165 * as the Samba server
166 */
167
168 if (!lp_allow_trusted_domains() &&
169 !(strequal("", domain) ||
170 strequal(lp_workgroup(), domain) ||
171 is_myname(domain))) {
172 DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
173 return False;
174 } else {
175 return True;
176 }
177}
178
179/**
180 * Check a user's Plaintext, LM or NTLM password.
181 *
182 * Check a user's password, as given in the user_info struct and return various
183 * interesting details in the server_info struct.
184 *
185 * This function does NOT need to be in a become_root()/unbecome_root() pair
186 * as it makes the calls itself when needed.
187 *
188 * The return value takes precedence over the contents of the server_info
189 * struct. When the return is other than NT_STATUS_OK the contents
190 * of that structure is undefined.
191 *
192 * @param user_info Contains the user supplied components, including the passwords.
193 * Must be created with make_user_info() or one of its wrappers.
194 *
195 * @param auth_context Supplies the challenges and some other data.
196 * Must be created with make_auth_context(), and the challenges should be
197 * filled in, either at creation or by calling the challenge geneation
198 * function auth_get_challenge().
199 *
200 * @param server_info If successful, contains information about the authentication,
201 * including a struct samu struct describing the user.
202 *
203 * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
204 *
205 **/
206
207static NTSTATUS check_ntlm_password(const struct auth_context *auth_context,
208 const struct auth_usersupplied_info *user_info,
209 struct auth_serversupplied_info **server_info)
210{
211 /* if all the modules say 'not for me' this is reasonable */
212 NTSTATUS nt_status = NT_STATUS_NO_SUCH_USER;
213 const char *unix_username;
214 auth_methods *auth_method;
215 TALLOC_CTX *mem_ctx;
216
217 if (!user_info || !auth_context || !server_info)
218 return NT_STATUS_LOGON_FAILURE;
219
220 DEBUG(3, ("check_ntlm_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
221 user_info->client_domain, user_info->smb_name, user_info->wksta_name));
222
223 DEBUG(3, ("check_ntlm_password: mapped user is: [%s]\\[%s]@[%s]\n",
224 user_info->domain, user_info->internal_username, user_info->wksta_name));
225
226 if (auth_context->challenge.length != 8) {
227 DEBUG(0, ("check_ntlm_password: Invalid challenge stored for this auth context - cannot continue\n"));
228 return NT_STATUS_LOGON_FAILURE;
229 }
230
231 if (auth_context->challenge_set_by)
232 DEBUG(10, ("check_ntlm_password: auth_context challenge created by %s\n",
233 auth_context->challenge_set_by));
234
235 DEBUG(10, ("challenge is: \n"));
236 dump_data(5, (const char *)auth_context->challenge.data, auth_context->challenge.length);
237
238#ifdef DEBUG_PASSWORD
239 DEBUG(100, ("user_info has passwords of length %d and %d\n",
240 (int)user_info->lm_resp.length, (int)user_info->nt_resp.length));
241 DEBUG(100, ("lm:\n"));
242 dump_data(100, (const char *)user_info->lm_resp.data, user_info->lm_resp.length);
243 DEBUG(100, ("nt:\n"));
244 dump_data(100, (const char *)user_info->nt_resp.data, user_info->nt_resp.length);
245#endif
246
247 /* This needs to be sorted: If it doesn't match, what should we do? */
248 if (!check_domain_match(user_info->smb_name, user_info->domain))
249 return NT_STATUS_LOGON_FAILURE;
250
251 for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next) {
252 NTSTATUS result;
253
254 mem_ctx = talloc_init("%s authentication for user %s\\%s", auth_method->name,
255 user_info->domain, user_info->smb_name);
256
257 result = auth_method->auth(auth_context, auth_method->private_data, mem_ctx, user_info, server_info);
258
259 /* check if the module did anything */
260 if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_NOT_IMPLEMENTED) ) {
261 DEBUG(10,("check_ntlm_password: %s had nothing to say\n", auth_method->name));
262 talloc_destroy(mem_ctx);
263 continue;
264 }
265
266 nt_status = result;
267
268 if (NT_STATUS_IS_OK(nt_status)) {
269 DEBUG(3, ("check_ntlm_password: %s authentication for user [%s] succeeded\n",
270 auth_method->name, user_info->smb_name));
271 } else {
272 DEBUG(5, ("check_ntlm_password: %s authentication for user [%s] FAILED with error %s\n",
273 auth_method->name, user_info->smb_name, nt_errstr(nt_status)));
274 }
275
276 talloc_destroy(mem_ctx);
277
278 if ( NT_STATUS_IS_OK(nt_status))
279 {
280 break;
281 }
282 }
283
284 /* successful authentication */
285
286 if (NT_STATUS_IS_OK(nt_status)) {
287 unix_username = (*server_info)->unix_name;
288 if (!(*server_info)->guest) {
289 /* We might not be root if we are an RPC call */
290 become_root();
291 nt_status = smb_pam_accountcheck(unix_username);
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->smb_name,
308 user_info->internal_username,
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->smb_name, user_info->internal_username,
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 void free_auth_context(struct auth_context **auth_context)
330{
331 auth_methods *auth_method;
332
333 if (*auth_context) {
334 /* Free private data of context's authentication methods */
335 for (auth_method = (*auth_context)->auth_method_list; auth_method; auth_method = auth_method->next) {
336 if (auth_method->free_private_data) {
337 auth_method->free_private_data (&auth_method->private_data);
338 auth_method->private_data = NULL;
339 }
340 }
341
342 talloc_destroy((*auth_context)->mem_ctx);
343 *auth_context = NULL;
344 }
345}
346
347/***************************************************************************
348 Make a auth_info struct
349***************************************************************************/
350
351static NTSTATUS make_auth_context(struct auth_context **auth_context)
352{
353 TALLOC_CTX *mem_ctx;
354
355 mem_ctx = talloc_init("authentication context");
356
357 *auth_context = TALLOC_P(mem_ctx, struct auth_context);
358 if (!*auth_context) {
359 DEBUG(0,("make_auth_context: talloc failed!\n"));
360 talloc_destroy(mem_ctx);
361 return NT_STATUS_NO_MEMORY;
362 }
363 ZERO_STRUCTP(*auth_context);
364
365 (*auth_context)->mem_ctx = mem_ctx;
366 (*auth_context)->check_ntlm_password = check_ntlm_password;
367 (*auth_context)->get_ntlm_challenge = get_ntlm_challenge;
368 (*auth_context)->free = free_auth_context;
369
370 return NT_STATUS_OK;
371}
372
373BOOL load_auth_module(struct auth_context *auth_context,
374 const char *module, auth_methods **ret)
375{
376 static BOOL initialised_static_modules = False;
377
378 struct auth_init_function_entry *entry;
379 char *module_name = smb_xstrdup(module);
380 char *module_params = NULL;
381 char *p;
382 BOOL good = False;
383
384 /* Initialise static modules if not done so yet */
385 if(!initialised_static_modules) {
386 static_init_auth;
387 initialised_static_modules = True;
388 }
389
390 DEBUG(5,("load_auth_module: Attempting to find an auth method to match %s\n",
391 module));
392
393 p = strchr(module_name, ':');
394 if (p) {
395 *p = 0;
396 module_params = p+1;
397 trim_char(module_params, ' ', ' ');
398 }
399
400 trim_char(module_name, ' ', ' ');
401
402 entry = auth_find_backend_entry(module_name);
403
404 if (entry == NULL) {
405 if (NT_STATUS_IS_OK(smb_probe_module("auth", module_name))) {
406 entry = auth_find_backend_entry(module_name);
407 }
408 }
409
410 if (entry != NULL) {
411 if (!NT_STATUS_IS_OK(entry->init(auth_context, module_params, ret))) {
412 DEBUG(0,("load_auth_module: auth method %s did not correctly init\n",
413 module_name));
414 } else {
415 DEBUG(5,("load_auth_module: auth method %s has a valid init\n",
416 module_name));
417 good = True;
418 }
419 } else {
420 DEBUG(0,("load_auth_module: can't find auth method %s!\n", module_name));
421 }
422
423 SAFE_FREE(module_name);
424 return good;
425}
426
427/***************************************************************************
428 Make a auth_info struct for the auth subsystem
429***************************************************************************/
430
431static NTSTATUS make_auth_context_text_list(struct auth_context **auth_context, char **text_list)
432{
433 auth_methods *list = NULL;
434 auth_methods *t = NULL;
435 NTSTATUS nt_status;
436
437 if (!text_list) {
438 DEBUG(2,("make_auth_context_text_list: No auth method list!?\n"));
439 return NT_STATUS_UNSUCCESSFUL;
440 }
441
442 if (!NT_STATUS_IS_OK(nt_status = make_auth_context(auth_context)))
443 return nt_status;
444
445 for (;*text_list; text_list++) {
446 if (load_auth_module(*auth_context, *text_list, &t)) {
447 DLIST_ADD_END(list, t, auth_methods *);
448 }
449 }
450
451 (*auth_context)->auth_method_list = list;
452
453 return nt_status;
454}
455
456/***************************************************************************
457 Make a auth_context struct for the auth subsystem
458***************************************************************************/
459
460NTSTATUS make_auth_context_subsystem(struct auth_context **auth_context)
461{
462 char **auth_method_list = NULL;
463 NTSTATUS nt_status;
464
465 if (lp_auth_methods() && !str_list_copy(&auth_method_list, lp_auth_methods())) {
466 return NT_STATUS_NO_MEMORY;
467 }
468
469 if (auth_method_list == NULL) {
470 switch (lp_security())
471 {
472 case SEC_DOMAIN:
473 DEBUG(5,("Making default auth method list for security=domain\n"));
474 auth_method_list = str_list_make("guest sam winbind:ntdomain", NULL);
475 break;
476 case SEC_SERVER:
477 DEBUG(5,("Making default auth method list for security=server\n"));
478 auth_method_list = str_list_make("guest sam smbserver", NULL);
479 break;
480 case SEC_USER:
481 if (lp_encrypted_passwords()) {
482 if ((lp_server_role() == ROLE_DOMAIN_PDC) || (lp_server_role() == ROLE_DOMAIN_BDC)) {
483 DEBUG(5,("Making default auth method list for DC, security=user, encrypt passwords = yes\n"));
484 auth_method_list = str_list_make("guest sam winbind:trustdomain", NULL);
485 } else {
486 DEBUG(5,("Making default auth method list for standalone security=user, encrypt passwords = yes\n"));
487 auth_method_list = str_list_make("guest sam", NULL);
488 }
489 } else {
490 DEBUG(5,("Making default auth method list for security=user, encrypt passwords = no\n"));
491 auth_method_list = str_list_make("guest unix", NULL);
492 }
493 break;
494 case SEC_SHARE:
495 if (lp_encrypted_passwords()) {
496 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = yes\n"));
497 auth_method_list = str_list_make("guest sam", NULL);
498 } else {
499 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = no\n"));
500 auth_method_list = str_list_make("guest unix", NULL);
501 }
502 break;
503 case SEC_ADS:
504 DEBUG(5,("Making default auth method list for security=ADS\n"));
505 auth_method_list = str_list_make("guest sam winbind:ntdomain", NULL);
506 break;
507 default:
508 DEBUG(5,("Unknown auth method!\n"));
509 return NT_STATUS_UNSUCCESSFUL;
510 }
511 } else {
512 DEBUG(5,("Using specified auth order\n"));
513 }
514
515 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_text_list(auth_context, auth_method_list))) {
516 str_list_free(&auth_method_list);
517 return nt_status;
518 }
519
520 str_list_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(struct auth_context **auth_context, uchar chal[8])
529{
530 NTSTATUS nt_status;
531 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(auth_context))) {
532 return nt_status;
533 }
534
535 (*auth_context)->challenge = data_blob_talloc((*auth_context)->mem_ctx, chal, 8);
536 (*auth_context)->challenge_set_by = "fixed";
537 return nt_status;
538}
539
540
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