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Revert that stupid one line change.
[Samba.git] / source3 / auth / auth.c
blobd43afc71e14294c2e93a57c1d9d211c48605fdf9
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
26 /** List of various built-in authentication modules */
27
28 const struct auth_init_function_entry builtin_auth_init_functions[] = {
29 { "guest", auth_init_guest },
30 { "rhosts", auth_init_rhosts },
31 { "hostsequiv", auth_init_hostsequiv },
32 { "sam", auth_init_sam },
33 { "samstrict", auth_init_samstrict },
34 { "unix", auth_init_unix },
35 { "smbserver", auth_init_smbserver },
36 { "ntdomain", auth_init_ntdomain },
37 { "trustdomain", auth_init_trustdomain },
38 { "winbind", auth_init_winbind },
39 #ifdef DEVELOPER
40 { "name_to_ntstatus", auth_init_name_to_ntstatus },
41 { "fixed_challenge", auth_init_fixed_challenge },
42 #endif
43 { "plugin", auth_init_plugin },
44 { NULL, NULL}
45 };
46
47 /****************************************************************************
48 Try to get a challenge out of the various authentication modules.
49 Returns a const char of length 8 bytes.
50 ****************************************************************************/
51
52 static const uint8 *get_ntlm_challenge(struct auth_context *auth_context)
53 {
54 DATA_BLOB challenge = data_blob(NULL, 0);
55 char *challenge_set_by = NULL;
56 auth_methods *auth_method;
57 TALLOC_CTX *mem_ctx;
58
59 if (auth_context->challenge.length) {
60 DEBUG(5, ("get_ntlm_challenge (auth subsystem): returning previous challenge (normal)\n"));
61 return auth_context->challenge.data;
62 }
63
64 for (auth_method = auth_context->auth_method_list; auth_method; auth_method = auth_method->next)
65 {
66 if (auth_method->get_chal == NULL) {
67 DEBUG(5, ("auth_get_challenge: module %s did not want to specify a challenge\n", auth_method->name));
68 continue;
69 }
70
71 DEBUG(5, ("auth_get_challenge: getting challenge from module %s\n", auth_method->name));
72 if (challenge_set_by != NULL) {
73 DEBUG(1, ("auth_get_challenge: CONFIGURATION ERROR: authentication method %s has already specified a challenge. Challenge by %s ignored.\n",
74 challenge_set_by, auth_method->name));
75 continue;
76 }
77
78 mem_ctx = talloc_init_named("auth_get_challenge for module %s", auth_method->name);
79 if (!mem_ctx) {
80 smb_panic("talloc_init_named() failed!");
81 }
82
83 challenge = auth_method->get_chal(auth_context, &auth_method->private_data, mem_ctx);
84 if (!challenge.length) {
85 DEBUG(3, ("auth_get_challenge: getting challenge from authentication method %s FAILED.\n",
86 auth_method->name));
87 } else {
88 DEBUG(5, ("auth_get_challenge: sucessfully got challenge from module %s\n", auth_method->name));
89 auth_context->challenge = challenge;
90 challenge_set_by = auth_method->name;
91 auth_context->challenge_set_method = auth_method;
92 }
93 talloc_destroy(mem_ctx);
94 }
95
96 if (!challenge_set_by) {
97 uchar chal[8];
98
99 generate_random_buffer(chal, sizeof(chal), False);
100 auth_context->challenge = data_blob_talloc(auth_context->mem_ctx,
101 chal, sizeof(chal));
102
103 challenge_set_by = "random";
104 }
105
106 DEBUG(5, ("auth_context challenge created by %s\n", challenge_set_by));
107 DEBUG(5, ("challenge is: \n"));
108 dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
109
110 SMB_ASSERT(auth_context->challenge.length == 8);
111
112 auth_context->challenge_set_by=challenge_set_by;
113
114 return auth_context->challenge.data;
115 }
116
117
118 /**
119 * Check user is in correct domain (if required)
120 *
121 * @param user Only used to fill in the debug message
122 *
123 * @param domain The domain to be verified
124 *
125 * @return True if the user can connect with that domain,
126 * False otherwise.
127 **/
128
129 static BOOL check_domain_match(const char *user, const char *domain)
130 {
131 /*
132 * If we aren't serving to trusted domains, we must make sure that
133 * the validation request comes from an account in the same domain
134 * as the Samba server
135 */
136
137 if (!lp_allow_trusted_domains() &&
138 !(strequal("", domain) ||
139 strequal(lp_workgroup(), domain) ||
140 is_netbios_alias_or_name(domain))) {
141 DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
142 return False;
143 } else {
144 return True;
145 }
146 }
147
148 /**
149 * Check a user's Plaintext, LM or NTLM password.
150 *
151 * Check a user's password, as given in the user_info struct and return various
152 * interesting details in the server_info struct.
153 *
154 * This function does NOT need to be in a become_root()/unbecome_root() pair
155 * as it makes the calls itself when needed.
156 *
157 * The return value takes precedence over the contents of the server_info
158 * struct. When the return is other than NT_STATUS_OK the contents
159 * of that structure is undefined.
160 *
161 * @param user_info Contains the user supplied components, including the passwords.
162 * Must be created with make_user_info() or one of its wrappers.
163 *
164 * @param auth_info Supplies the challenges and some other data.
165 * Must be created with make_auth_info(), and the challenges should be
166 * filled in, either at creation or by calling the challenge geneation
167 * function auth_get_challenge().
168 *
169 * @param server_info If successful, contains information about the authentication,
170 * including a SAM_ACCOUNT struct describing the user.
171 *
172 * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
173 *
174 **/
175
176 static NTSTATUS check_ntlm_password(const struct auth_context *auth_context,
177 const struct auth_usersupplied_info *user_info,
178 struct auth_serversupplied_info **server_info)
179 {
180
181 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
182 const char *pdb_username;
183 auth_methods *auth_method;
184 TALLOC_CTX *mem_ctx;
185
186 if (!user_info || !auth_context || !server_info) {
187 return NT_STATUS_LOGON_FAILURE;
188 }
189
190 DEBUG(3, ("check_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
191 user_info->client_domain.str, user_info->smb_name.str, user_info->wksta_name.str));
192
193 DEBUG(3, ("check_password: mapped user is: [%s]\\[%s]@[%s]\n",
194 user_info->domain.str, user_info->internal_username.str, user_info->wksta_name.str));
195 if (auth_context->challenge_set_by) {
196 DEBUG(10, ("auth_context challenge created by %s\n", auth_context->challenge_set_by));
197 }
198 DEBUG(10, ("challenge is: \n"));
199 dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
200
201 #ifdef DEBUG_PASSWORD
202 DEBUG(100, ("user_info has passwords of length %d and %d\n",
203 user_info->lm_resp.length, user_info->nt_resp.length));
204 DEBUG(100, ("lm:\n"));
205 dump_data(100, user_info->lm_resp.data, user_info->lm_resp.length);
206 DEBUG(100, ("nt:\n"));
207 dump_data(100, user_info->nt_resp.data, user_info->nt_resp.length);
208 #endif
209
210 /* This needs to be sorted: If it doesn't match, what should we do? */
211 if (!check_domain_match(user_info->smb_name.str, user_info->domain.str)) {
212 return NT_STATUS_LOGON_FAILURE;
213 }
214
215 for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next)
216 {
217 mem_ctx = talloc_init_named("%s authentication for user %s\\%s", auth_method->name,
218 user_info->domain.str, user_info->smb_name.str);
219
220 nt_status = auth_method->auth(auth_context, auth_method->private_data, mem_ctx, user_info, server_info);
221 if (NT_STATUS_IS_OK(nt_status)) {
222 DEBUG(3, ("check_password: %s authentication for user [%s] suceeded\n",
223 auth_method->name, user_info->smb_name.str));
224 } else {
225 DEBUG(5, ("check_password: %s authentication for user [%s] FAILED with error %s\n",
226 auth_method->name, user_info->smb_name.str, nt_errstr(nt_status)));
227 }
228
229 talloc_destroy(mem_ctx);
230
231 if (NT_STATUS_IS_OK(nt_status)) {
232 break;
233 }
234 }
235
236 /* This is one of the few places the *relies* (rather than just sets defaults
237 on the value of lp_security(). This needs to change. A new paramater
238 perhaps? */
239 if (lp_security() >= SEC_SERVER) {
240 smb_user_control(user_info, *server_info, nt_status);
241 }
242
243 if (NT_STATUS_IS_OK(nt_status)) {
244 pdb_username = pdb_get_username((*server_info)->sam_account);
245 if (!(*server_info)->guest) {
246 /* We might not be root if we are an RPC call */
247 become_root();
248 nt_status = smb_pam_accountcheck(pdb_username);
249 unbecome_root();
250
251 if (NT_STATUS_IS_OK(nt_status)) {
252 DEBUG(5, ("check_password: PAM Account for user [%s] suceeded\n",
253 pdb_username));
254 } else {
255 DEBUG(3, ("check_password: PAM Account for user [%s] FAILED with error %s\n",
256 pdb_username, nt_errstr(nt_status)));
257 }
258 }
259
260 if (NT_STATUS_IS_OK(nt_status)) {
261 DEBUG((*server_info)->guest ? 5 : 2,
262 ("check_password: %sauthentication for user [%s] -> [%s] -> [%s] suceeded\n",
263 (*server_info)->guest ? "guest " : "",
264 user_info->smb_name.str,
265 user_info->internal_username.str,
266 pdb_username));
267 }
268 }
269
270 if (!NT_STATUS_IS_OK(nt_status)) {
271 DEBUG(2, ("check_password: Authentication for user [%s] -> [%s] FAILED with error %s\n",
272 user_info->smb_name.str, user_info->internal_username.str,
273 nt_errstr(nt_status)));
274 ZERO_STRUCTP(server_info);
275 }
276 return nt_status;
277 }
278
279 /***************************************************************************
280 Clear out a auth_context, and destroy the attached TALLOC_CTX
281 ***************************************************************************/
282
283 static void free_auth_context(struct auth_context **auth_context)
284 {
285 if (*auth_context != NULL) {
286 talloc_destroy((*auth_context)->mem_ctx);
287 }
288 *auth_context = NULL;
289 }
290
291 /***************************************************************************
292 Make a auth_info struct
293 ***************************************************************************/
294
295 static NTSTATUS make_auth_context(struct auth_context **auth_context)
296 {
297 TALLOC_CTX *mem_ctx;
298
299 mem_ctx = talloc_init_named("authentication context");
300
301 *auth_context = talloc(mem_ctx, sizeof(**auth_context));
302 if (!*auth_context) {
303 DEBUG(0,("make_auth_context: talloc failed!\n"));
304 talloc_destroy(mem_ctx);
305 return NT_STATUS_NO_MEMORY;
306 }
307 ZERO_STRUCTP(*auth_context);
308
309 (*auth_context)->mem_ctx = mem_ctx;
310 (*auth_context)->check_ntlm_password = check_ntlm_password;
311 (*auth_context)->get_ntlm_challenge = get_ntlm_challenge;
312 (*auth_context)->free = free_auth_context;
313
314 return NT_STATUS_OK;
315 }
316
317 /***************************************************************************
318 Make a auth_info struct for the auth subsystem
319 ***************************************************************************/
320
321 static NTSTATUS make_auth_context_text_list(struct auth_context **auth_context, char **text_list)
322 {
323 auth_methods *list = NULL;
324 auth_methods *t = NULL;
325 auth_methods *tmp;
326 int i;
327 NTSTATUS nt_status;
328
329 if (!text_list) {
330 DEBUG(2,("No auth method list!?\n"));
331 return NT_STATUS_UNSUCCESSFUL;
332 }
333
334 if (!NT_STATUS_IS_OK(nt_status = make_auth_context(auth_context))) {
335 return nt_status;
336 }
337
338 for (;*text_list; text_list++)
339 {
340 DEBUG(5,("Attempting to find an auth method to match %s\n", *text_list));
341 for (i = 0; builtin_auth_init_functions[i].name; i++)
342 {
343 if (strequal(builtin_auth_init_functions[i].name, *text_list))
344 {
345
346 char *module_name = smb_xstrdup(*text_list);
347 char *module_params = NULL;
348 char *p;
349
350 p = strchr(module_name, ':');
351
352 if (p) {
353 *p = 0;
354
355 module_params = p+1;
356
357 trim_string(module_params, " ", " ");
358 }
359
360 trim_string(module_name, " ", " ");
361
362 DEBUG(5,("Found auth method %s (at pos %d)\n", *text_list, i));
363 if (NT_STATUS_IS_OK(builtin_auth_init_functions[i].init(*auth_context, module_params, &t))) {
364 DEBUG(5,("auth method %s has a valid init\n", *text_list));
365 DLIST_ADD_END(list, t, tmp);
366 } else {
367 DEBUG(0,("auth method %s did not correctly init\n", *text_list));
368 }
369 SAFE_FREE(module_name);
370 break;
371 }
372 }
373 }
374
375 (*auth_context)->auth_method_list = list;
376
377 return nt_status;
378 }
379
380 /***************************************************************************
381 Make a auth_context struct for the auth subsystem
382 ***************************************************************************/
383
384 NTSTATUS make_auth_context_subsystem(struct auth_context **auth_context)
385 {
386 char **auth_method_list = NULL;
387 NTSTATUS nt_status;
388
389 if (lp_auth_methods() && !str_list_copy(&auth_method_list, lp_auth_methods())) {
390 return NT_STATUS_NO_MEMORY;
391 }
392
393 if (auth_method_list == NULL) {
394 switch (lp_security())
395 {
396 case SEC_DOMAIN:
397 DEBUG(5,("Making default auth method list for security=domain\n"));
398 auth_method_list = str_list_make("guest sam winbind ntdomain", NULL);
399 break;
400 case SEC_SERVER:
401 DEBUG(5,("Making default auth method list for security=server\n"));
402 auth_method_list = str_list_make("guest sam smbserver", NULL);
403 break;
404 case SEC_USER:
405 if (lp_encrypted_passwords()) {
406 DEBUG(5,("Making default auth method list for security=user, encrypt passwords = yes\n"));
407 auth_method_list = str_list_make("guest sam", NULL);
408 } else {
409 DEBUG(5,("Making default auth method list for security=user, encrypt passwords = no\n"));
410 auth_method_list = str_list_make("guest unix", NULL);
411 }
412 break;
413 case SEC_SHARE:
414 if (lp_encrypted_passwords()) {
415 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = yes\n"));
416 auth_method_list = str_list_make("guest sam", NULL);
417 } else {
418 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = no\n"));
419 auth_method_list = str_list_make("guest unix", NULL);
420 }
421 break;
422 case SEC_ADS:
423 DEBUG(5,("Making default auth method list for security=ADS\n"));
424 auth_method_list = str_list_make("guest sam ads winbind ntdomain", NULL);
425 break;
426 default:
427 DEBUG(5,("Unknown auth method!\n"));
428 return NT_STATUS_UNSUCCESSFUL;
429 }
430 } else {
431 DEBUG(5,("Using specified auth order\n"));
432 }
433
434 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_text_list(auth_context, auth_method_list))) {
435 str_list_free(&auth_method_list);
436 return nt_status;
437 }
438
439 str_list_free(&auth_method_list);
440 return nt_status;
441 }
442
443 /***************************************************************************
444 Make a auth_info struct with a fixed challenge
445 ***************************************************************************/
446
447 NTSTATUS make_auth_context_fixed(struct auth_context **auth_context, uchar chal[8])
448 {
449 NTSTATUS nt_status;
450 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(auth_context))) {
451 return nt_status;
452 }
453
454 (*auth_context)->challenge = data_blob(chal, 8);
455 return nt_status;
456 }
457
458
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