2 Unix SMB/CIFS implementation.
3 Password and authentication handling
4 Copyright (C) Andrew Bartlett 2001-2002
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.
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.
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.
22 #include "dlinklist.h"
23 #include "auth/auth.h"
26 #define DBGC_CLASS DBGC_AUTH
28 /****************************************************************************
29 Try to get a challenge out of the various authentication modules.
30 Returns a const char of length 8 bytes.
31 ****************************************************************************/
33 static const uint8_t *get_ntlm_challenge(struct auth_context *auth_context)
35 DATA_BLOB challenge = data_blob(NULL, 0);
36 const char *challenge_set_by = NULL;
37 struct auth_methods *auth_method;
40 if (auth_context->challenge.length) {
41 DEBUG(5, ("get_ntlm_challenge (auth subsystem): returning previous challenge by module %s (normal)\n",
42 auth_context->challenge_set_by));
43 return auth_context->challenge.data;
46 auth_context->challenge_may_be_modified = False;
48 for (auth_method = auth_context->auth_method_list; auth_method; auth_method = auth_method->next) {
49 if (auth_method->get_chal == NULL) {
50 DEBUG(5, ("auth_get_challenge: module %s did not want to specify a challenge\n", auth_method->name));
54 DEBUG(5, ("auth_get_challenge: getting challenge from module %s\n", auth_method->name));
55 if (challenge_set_by != NULL) {
56 DEBUG(1, ("auth_get_challenge: CONFIGURATION ERROR: authentication method %s has already specified a challenge. Challenge by %s ignored.\n",
57 challenge_set_by, auth_method->name));
61 mem_ctx = talloc_init("auth_get_challenge for module %s", auth_method->name);
63 smb_panic("talloc_init() failed!");
66 challenge = auth_method->get_chal(auth_context, &auth_method->private_data, mem_ctx);
67 if (!challenge.length) {
68 DEBUG(3, ("auth_get_challenge: getting challenge from authentication method %s FAILED.\n",
71 DEBUG(5, ("auth_get_challenge: sucessfully got challenge from module %s\n", auth_method->name));
72 auth_context->challenge = challenge;
73 challenge_set_by = auth_method->name;
74 auth_context->challenge_set_method = auth_method;
76 talloc_destroy(mem_ctx);
79 if (!challenge_set_by) {
82 generate_random_buffer(chal, sizeof(chal));
83 auth_context->challenge = data_blob_talloc(auth_context,
86 challenge_set_by = "random";
87 auth_context->challenge_may_be_modified = True;
90 DEBUG(5, ("auth_context challenge created by %s\n", challenge_set_by));
91 DEBUG(5, ("challenge is: \n"));
92 dump_data(5, (const char *)auth_context->challenge.data, auth_context->challenge.length);
94 SMB_ASSERT(auth_context->challenge.length == 8);
96 auth_context->challenge_set_by=challenge_set_by;
98 return auth_context->challenge.data;
103 * Check user is in correct domain (if required)
105 * @param user Only used to fill in the debug message
107 * @param domain The domain to be verified
109 * @return True if the user can connect with that domain,
113 static BOOL check_domain_match(const char *user, const char *domain)
116 * If we aren't serving to trusted domains, we must make sure that
117 * the validation request comes from an account in the same domain
118 * as the Samba server
121 if (!lp_allow_trusted_domains() &&
122 !(strequal("", domain) ||
123 strequal(lp_workgroup(), domain) ||
124 is_myname(domain))) {
125 DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
133 * Check a user's Plaintext, LM or NTLM password.
135 * Check a user's password, as given in the user_info struct and return various
136 * interesting details in the server_info struct.
138 * The return value takes precedence over the contents of the server_info
139 * struct. When the return is other than NT_STATUS_OK the contents
140 * of that structure is undefined.
142 * @param user_info Contains the user supplied components, including the passwords.
143 * Must be created with make_user_info() or one of its wrappers.
145 * @param auth_context Supplies the challenges and some other data.
146 * Must be created with make_auth_context(), and the challenges should be
147 * filled in, either at creation or by calling the challenge geneation
148 * function auth_get_challenge().
150 * @param server_info If successful, contains information about the authentication,
151 * including a SAM_ACCOUNT struct describing the user.
153 * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
157 static NTSTATUS check_ntlm_password(struct auth_context *auth_context,
158 const struct auth_usersupplied_info *user_info,
159 TALLOC_CTX *out_mem_ctx,
160 struct auth_serversupplied_info **server_info)
162 /* if all the modules say 'not for me' this is reasonable */
163 NTSTATUS nt_status = NT_STATUS_NO_SUCH_USER;
164 struct auth_methods *auth_method;
167 if (!user_info || !auth_context || !server_info)
168 return NT_STATUS_LOGON_FAILURE;
170 DEBUG(3, ("check_ntlm_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
171 user_info->client_domain.str, user_info->smb_name.str, user_info->wksta_name.str));
173 DEBUG(3, ("check_ntlm_password: mapped user is: [%s]\\[%s]@[%s]\n",
174 user_info->domain.str, user_info->internal_username.str, user_info->wksta_name.str));
176 if (auth_context->challenge.length == 0) {
177 /* get a challenge, if we have not asked for one yet */
178 get_ntlm_challenge(auth_context);
181 if (auth_context->challenge.length != 8) {
182 DEBUG(0, ("check_ntlm_password: Invalid challenge stored for this auth context - cannot continue\n"));
183 return NT_STATUS_LOGON_FAILURE;
186 if (auth_context->challenge_set_by)
187 DEBUG(10, ("check_ntlm_password: auth_context challenge created by %s\n",
188 auth_context->challenge_set_by));
190 DEBUG(10, ("challenge is: \n"));
191 dump_data(5, (const char *)auth_context->challenge.data, auth_context->challenge.length);
193 #ifdef DEBUG_PASSWORD
194 DEBUG(100, ("user_info has passwords of length %d and %d\n",
195 user_info->lm_resp.length, user_info->nt_resp.length));
196 DEBUG(100, ("lm:\n"));
197 dump_data(100, user_info->lm_resp.data, user_info->lm_resp.length);
198 DEBUG(100, ("nt:\n"));
199 dump_data(100, user_info->nt_resp.data, user_info->nt_resp.length);
202 /* This needs to be sorted: If it doesn't match, what should we do? */
203 if (!check_domain_match(user_info->smb_name.str, user_info->domain.str))
204 return NT_STATUS_LOGON_FAILURE;
206 for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next) {
209 mem_ctx = talloc_init("%s authentication for user %s\\%s", auth_method->name,
210 user_info->domain.str, user_info->smb_name.str);
212 result = auth_method->auth(auth_context, auth_method->private_data, mem_ctx, user_info, server_info);
214 /* check if the module did anything */
215 if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_NOT_IMPLEMENTED) ) {
216 DEBUG(10,("check_ntlm_password: %s had nothing to say\n", auth_method->name));
217 talloc_destroy(mem_ctx);
223 if (NT_STATUS_IS_OK(nt_status)) {
224 DEBUG(3, ("check_ntlm_password: %s authentication for user [%s] succeeded\n",
225 auth_method->name, user_info->smb_name.str));
227 /* Give the server info to the client to hold onto */
228 talloc_reference(out_mem_ctx, *server_info);
230 DEBUG(5, ("check_ntlm_password: %s authentication for user [%s] FAILED with error %s\n",
231 auth_method->name, user_info->smb_name.str, nt_errstr(nt_status)));
234 talloc_destroy(mem_ctx);
236 if ( NT_STATUS_IS_OK(nt_status))
242 if (NT_STATUS_IS_OK(nt_status)) {
243 if (NT_STATUS_IS_OK(nt_status)) {
244 DEBUG((*server_info)->guest ? 5 : 2,
245 ("check_ntlm_password: %sauthentication for user [%s] -> [%s] succeeded\n",
246 (*server_info)->guest ? "guest " : "",
247 user_info->smb_name.str,
248 user_info->internal_username.str));
252 if (!NT_STATUS_IS_OK(nt_status)) {
253 DEBUG(2, ("check_ntlm_password: Authentication for user [%s] -> [%s] FAILED with error %s\n",
254 user_info->smb_name.str, user_info->internal_username.str,
255 nt_errstr(nt_status)));
256 ZERO_STRUCTP(server_info);
261 /***************************************************************************
262 Clear out a auth_context, and destroy the attached TALLOC_CTX
263 ***************************************************************************/
265 void free_auth_context(struct auth_context **auth_context)
267 struct auth_methods *auth_method;
270 /* Free private data of context's authentication methods */
271 for (auth_method = (*auth_context)->auth_method_list; auth_method; auth_method = auth_method->next) {
272 if (auth_method->free_private_data) {
273 auth_method->free_private_data (&auth_method->private_data);
274 auth_method->private_data = NULL;
278 talloc_free(*auth_context);
279 *auth_context = NULL;
283 /***************************************************************************
284 Make a auth_info struct
285 ***************************************************************************/
287 static NTSTATUS make_auth_context(TALLOC_CTX *mem_ctx, struct auth_context **auth_context)
289 *auth_context = talloc_p(mem_ctx, struct auth_context);
290 if (!*auth_context) {
291 DEBUG(0,("make_auth_context: talloc failed!\n"));
292 return NT_STATUS_NO_MEMORY;
294 ZERO_STRUCTP(*auth_context);
296 (*auth_context)->check_ntlm_password = check_ntlm_password;
297 (*auth_context)->get_ntlm_challenge = get_ntlm_challenge;
302 /***************************************************************************
303 Make a auth_info struct for the auth subsystem
304 ***************************************************************************/
306 static NTSTATUS make_auth_context_text_list(TALLOC_CTX *mem_ctx,
307 struct auth_context **auth_context, char **text_list)
309 struct auth_methods *list = NULL;
310 struct auth_methods *t = NULL;
314 DEBUG(2,("make_auth_context_text_list: No auth method list!?\n"));
315 return NT_STATUS_UNSUCCESSFUL;
318 if (!NT_STATUS_IS_OK(nt_status = make_auth_context(mem_ctx, auth_context)))
321 for (;*text_list; text_list++) {
322 char *module_name = smb_xstrdup(*text_list);
323 char *module_params = NULL;
325 const struct auth_operations *ops;
327 DEBUG(5,("make_auth_context_text_list: Attempting to find an auth method to match %s\n",
330 p = strchr(module_name, ':');
334 trim_string(module_params, " ", " ");
337 trim_string(module_name, " ", " ");
339 ops = auth_backend_byname(module_name);
341 DEBUG(5,("make_auth_context_text_list: Found auth method %s\n", *text_list));
342 SAFE_FREE(module_name);
346 if (NT_STATUS_IS_OK(ops->init(*auth_context, module_params, &t))) {
347 DEBUG(5,("make_auth_context_text_list: auth method %s has a valid init\n",
349 DLIST_ADD_END(list, t, struct auth_methods *);
351 DEBUG(0,("make_auth_context_text_list: auth method %s did not correctly init\n",
354 SAFE_FREE(module_name);
357 (*auth_context)->auth_method_list = list;
362 /***************************************************************************
363 Make a auth_context struct for the auth subsystem
364 ***************************************************************************/
366 NTSTATUS make_auth_context_subsystem(TALLOC_CTX *mem_ctx, struct auth_context **auth_context)
368 char **auth_method_list = NULL;
371 if (lp_auth_methods() && !str_list_copy(&auth_method_list, lp_auth_methods())) {
372 return NT_STATUS_NO_MEMORY;
375 nt_status = make_auth_context_text_list(mem_ctx, auth_context, auth_method_list);
376 if (!NT_STATUS_IS_OK(nt_status)) {
377 str_list_free(&auth_method_list);
381 str_list_free(&auth_method_list);
385 /***************************************************************************
386 Make a auth_info struct with a fixed challenge
387 ***************************************************************************/
389 NTSTATUS make_auth_context_fixed(TALLOC_CTX *mem_ctx,
390 struct auth_context **auth_context, uint8_t chal[8])
393 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(mem_ctx, auth_context))) {
397 (*auth_context)->challenge = data_blob_talloc(*auth_context, chal, 8);
398 (*auth_context)->challenge_set_by = "fixed";
402 /* the list of currently registered AUTH backends */
404 const struct auth_operations *ops;
406 static int num_backends;
409 register a AUTH backend.
411 The 'name' can be later used by other backends to find the operations
412 structure for this backend.
414 static NTSTATUS auth_register(const void *_ops)
416 const struct auth_operations *ops = _ops;
417 struct auth_operations *new_ops;
419 if (auth_backend_byname(ops->name) != NULL) {
420 /* its already registered! */
421 DEBUG(0,("AUTH backend '%s' already registered\n",
423 return NT_STATUS_OBJECT_NAME_COLLISION;
426 backends = Realloc(backends, sizeof(backends[0]) * (num_backends+1));
428 smb_panic("out of memory in auth_register");
431 new_ops = smb_xmemdup(ops, sizeof(*ops));
432 new_ops->name = smb_xstrdup(ops->name);
434 backends[num_backends].ops = new_ops;
438 DEBUG(3,("AUTH backend '%s' registered\n",
445 return the operations structure for a named backend of the specified type
447 const struct auth_operations *auth_backend_byname(const char *name)
451 for (i=0;i<num_backends;i++) {
452 if (strcmp(backends[i].ops->name, name) == 0) {
453 return backends[i].ops;
461 return the AUTH interface version, and the size of some critical types
462 This can be used by backends to either detect compilation errors, or provide
463 multiple implementations for different smbd compilation options in one module
465 const struct auth_critical_sizes *auth_interface_version(void)
467 static const struct auth_critical_sizes critical_sizes = {
468 AUTH_INTERFACE_VERSION,
469 sizeof(struct auth_operations),
470 sizeof(struct auth_methods),
471 sizeof(struct auth_context),
472 sizeof(struct auth_usersupplied_info),
473 sizeof(struct auth_serversupplied_info),
474 sizeof(struct auth_str),
477 return &critical_sizes;
481 initialise the AUTH subsystem
487 /* ugly cludge, to go away */
488 static BOOL initialised;
494 status = register_subsystem("auth", auth_register);
495 if (!NT_STATUS_IS_OK(status)) {
499 /* FIXME: Perhaps panic if a basic backend, such as SAM, fails to initialise? */
503 DEBUG(3,("AUTH subsystem version %d initialised\n", AUTH_INTERFACE_VERSION));
507 NTSTATUS server_service_auth_init(void)