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.
24 #define DBGC_CLASS DBGC_AUTH
26 /** List of various built-in authentication modules */
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 },
40 { "name_to_ntstatus", auth_init_name_to_ntstatus },
41 { "fixed_challenge", auth_init_fixed_challenge },
43 { "plugin", auth_init_plugin },
47 /****************************************************************************
48 Try to get a challenge out of the various authentication modules.
49 Returns a const char of length 8 bytes.
50 ****************************************************************************/
52 static const uint8 *get_ntlm_challenge(struct auth_context *auth_context)
54 DATA_BLOB challenge = data_blob(NULL, 0);
55 char *challenge_set_by = NULL;
56 auth_methods *auth_method;
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;
64 for (auth_method = auth_context->auth_method_list; auth_method; auth_method = auth_method->next) {
65 if (auth_method->get_chal == NULL) {
66 DEBUG(5, ("auth_get_challenge: module %s did not want to specify a challenge\n", auth_method->name));
70 DEBUG(5, ("auth_get_challenge: getting challenge from module %s\n", auth_method->name));
71 if (challenge_set_by != NULL) {
72 DEBUG(1, ("auth_get_challenge: CONFIGURATION ERROR: authentication method %s has already specified a challenge. Challenge by %s ignored.\n",
73 challenge_set_by, auth_method->name));
77 mem_ctx = talloc_init("auth_get_challenge for module %s", auth_method->name);
79 smb_panic("talloc_init() failed!");
82 challenge = auth_method->get_chal(auth_context, &auth_method->private_data, mem_ctx);
83 if (!challenge.length) {
84 DEBUG(3, ("auth_get_challenge: getting challenge from authentication method %s FAILED.\n",
87 DEBUG(5, ("auth_get_challenge: sucessfully got challenge from module %s\n", auth_method->name));
88 auth_context->challenge = challenge;
89 challenge_set_by = auth_method->name;
90 auth_context->challenge_set_method = auth_method;
92 talloc_destroy(mem_ctx);
95 if (!challenge_set_by) {
98 generate_random_buffer(chal, sizeof(chal), False);
99 auth_context->challenge = data_blob_talloc(auth_context->mem_ctx,
102 challenge_set_by = "random";
105 DEBUG(5, ("auth_context challenge created by %s\n", challenge_set_by));
106 DEBUG(5, ("challenge is: \n"));
107 dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
109 SMB_ASSERT(auth_context->challenge.length == 8);
111 auth_context->challenge_set_by=challenge_set_by;
113 return auth_context->challenge.data;
118 * Check user is in correct domain (if required)
120 * @param user Only used to fill in the debug message
122 * @param domain The domain to be verified
124 * @return True if the user can connect with that domain,
128 static BOOL check_domain_match(const char *user, const char *domain)
131 * If we aren't serving to trusted domains, we must make sure that
132 * the validation request comes from an account in the same domain
133 * as the Samba server
136 if (!lp_allow_trusted_domains() &&
137 !(strequal("", domain) ||
138 strequal(lp_workgroup(), domain) ||
139 is_myname(domain))) {
140 DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
148 * Check a user's Plaintext, LM or NTLM password.
150 * Check a user's password, as given in the user_info struct and return various
151 * interesting details in the server_info struct.
153 * This function does NOT need to be in a become_root()/unbecome_root() pair
154 * as it makes the calls itself when needed.
156 * The return value takes precedence over the contents of the server_info
157 * struct. When the return is other than NT_STATUS_OK the contents
158 * of that structure is undefined.
160 * @param user_info Contains the user supplied components, including the passwords.
161 * Must be created with make_user_info() or one of its wrappers.
163 * @param auth_info Supplies the challenges and some other data.
164 * Must be created with make_auth_info(), and the challenges should be
165 * filled in, either at creation or by calling the challenge geneation
166 * function auth_get_challenge().
168 * @param server_info If successful, contains information about the authentication,
169 * including a SAM_ACCOUNT struct describing the user.
171 * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
175 static NTSTATUS check_ntlm_password(const struct auth_context *auth_context,
176 const struct auth_usersupplied_info *user_info,
177 struct auth_serversupplied_info **server_info)
180 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
181 const char *pdb_username;
182 auth_methods *auth_method;
185 if (!user_info || !auth_context || !server_info)
186 return NT_STATUS_LOGON_FAILURE;
188 DEBUG(3, ("check_ntlm_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
189 user_info->client_domain.str, user_info->smb_name.str, user_info->wksta_name.str));
191 DEBUG(3, ("check_ntlm_password: mapped user is: [%s]\\[%s]@[%s]\n",
192 user_info->domain.str, user_info->internal_username.str, user_info->wksta_name.str));
193 if (auth_context->challenge_set_by)
194 DEBUG(10, ("check_ntlm_password: auth_context challenge created by %s\n",
195 auth_context->challenge_set_by));
197 DEBUG(10, ("challenge is: \n"));
198 dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
200 #ifdef DEBUG_PASSWORD
201 DEBUG(100, ("user_info has passwords of length %d and %d\n",
202 user_info->lm_resp.length, user_info->nt_resp.length));
203 DEBUG(100, ("lm:\n"));
204 dump_data(100, user_info->lm_resp.data, user_info->lm_resp.length);
205 DEBUG(100, ("nt:\n"));
206 dump_data(100, user_info->nt_resp.data, user_info->nt_resp.length);
209 /* This needs to be sorted: If it doesn't match, what should we do? */
210 if (!check_domain_match(user_info->smb_name.str, user_info->domain.str))
211 return NT_STATUS_LOGON_FAILURE;
213 for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next) {
214 mem_ctx = talloc_init("%s authentication for user %s\\%s", auth_method->name,
215 user_info->domain.str, user_info->smb_name.str);
217 nt_status = auth_method->auth(auth_context, auth_method->private_data, mem_ctx, user_info, server_info);
218 if (NT_STATUS_IS_OK(nt_status)) {
219 DEBUG(3, ("check_ntlm_password: %s authentication for user [%s] suceeded\n",
220 auth_method->name, user_info->smb_name.str));
222 DEBUG(5, ("check_ntlm_password: %s authentication for user [%s] FAILED with error %s\n",
223 auth_method->name, user_info->smb_name.str, nt_errstr(nt_status)));
226 talloc_destroy(mem_ctx);
228 if (NT_STATUS_IS_OK(nt_status))
232 /* This is one of the few places the *relies* (rather than just sets defaults
233 on the value of lp_security(). This needs to change. A new paramater
235 if (lp_security() >= SEC_SERVER)
236 smb_user_control(user_info, *server_info, nt_status);
238 if (NT_STATUS_IS_OK(nt_status)) {
239 pdb_username = pdb_get_username((*server_info)->sam_account);
240 if (!(*server_info)->guest) {
241 /* We might not be root if we are an RPC call */
243 nt_status = smb_pam_accountcheck(pdb_username);
246 if (NT_STATUS_IS_OK(nt_status)) {
247 DEBUG(5, ("check_ntlm_password: PAM Account for user [%s] suceeded\n",
250 DEBUG(3, ("check_ntlm_password: PAM Account for user [%s] FAILED with error %s\n",
251 pdb_username, nt_errstr(nt_status)));
255 if (NT_STATUS_IS_OK(nt_status)) {
256 DEBUG((*server_info)->guest ? 5 : 2,
257 ("check_ntlm_password: %sauthentication for user [%s] -> [%s] -> [%s] suceeded\n",
258 (*server_info)->guest ? "guest " : "",
259 user_info->smb_name.str,
260 user_info->internal_username.str,
265 if (!NT_STATUS_IS_OK(nt_status)) {
266 DEBUG(2, ("check_ntlm_password: Authentication for user [%s] -> [%s] FAILED with error %s\n",
267 user_info->smb_name.str, user_info->internal_username.str,
268 nt_errstr(nt_status)));
269 ZERO_STRUCTP(server_info);
274 /***************************************************************************
275 Clear out a auth_context, and destroy the attached TALLOC_CTX
276 ***************************************************************************/
278 static void free_auth_context(struct auth_context **auth_context)
280 if (*auth_context != NULL)
281 talloc_destroy((*auth_context)->mem_ctx);
282 *auth_context = NULL;
285 /***************************************************************************
286 Make a auth_info struct
287 ***************************************************************************/
289 static NTSTATUS make_auth_context(struct auth_context **auth_context)
293 mem_ctx = talloc_init("authentication context");
295 *auth_context = talloc(mem_ctx, sizeof(**auth_context));
296 if (!*auth_context) {
297 DEBUG(0,("make_auth_context: talloc failed!\n"));
298 talloc_destroy(mem_ctx);
299 return NT_STATUS_NO_MEMORY;
301 ZERO_STRUCTP(*auth_context);
303 (*auth_context)->mem_ctx = mem_ctx;
304 (*auth_context)->check_ntlm_password = check_ntlm_password;
305 (*auth_context)->get_ntlm_challenge = get_ntlm_challenge;
306 (*auth_context)->free = free_auth_context;
311 /***************************************************************************
312 Make a auth_info struct for the auth subsystem
313 ***************************************************************************/
315 static NTSTATUS make_auth_context_text_list(struct auth_context **auth_context, char **text_list)
317 auth_methods *list = NULL;
318 auth_methods *t = NULL;
324 DEBUG(2,("make_auth_context_text_list: No auth method list!?\n"));
325 return NT_STATUS_UNSUCCESSFUL;
328 if (!NT_STATUS_IS_OK(nt_status = make_auth_context(auth_context)))
331 for (;*text_list; text_list++) {
332 DEBUG(5,("make_auth_context_text_list: Attempting to find an auth method to match %s\n",
334 for (i = 0; builtin_auth_init_functions[i].name; i++) {
335 char *module_name = smb_xstrdup(*text_list);
336 char *module_params = NULL;
339 p = strchr(module_name, ':');
343 trim_string(module_params, " ", " ");
346 trim_string(module_name, " ", " ");
348 if (strequal(builtin_auth_init_functions[i].name, module_name)) {
349 DEBUG(5,("make_auth_context_text_list: Found auth method %s (at pos %d)\n", *text_list, i));
350 if (NT_STATUS_IS_OK(builtin_auth_init_functions[i].init(*auth_context, module_params, &t))) {
351 DEBUG(5,("make_auth_context_text_list: auth method %s has a valid init\n",
353 DLIST_ADD_END(list, t, tmp);
355 DEBUG(0,("make_auth_context_text_list: auth method %s did not correctly init\n",
360 SAFE_FREE(module_name);
364 (*auth_context)->auth_method_list = list;
369 /***************************************************************************
370 Make a auth_context struct for the auth subsystem
371 ***************************************************************************/
373 NTSTATUS make_auth_context_subsystem(struct auth_context **auth_context)
375 char **auth_method_list = NULL;
378 if (lp_auth_methods() && !str_list_copy(&auth_method_list, lp_auth_methods())) {
379 return NT_STATUS_NO_MEMORY;
382 if (auth_method_list == NULL) {
383 switch (lp_security())
386 DEBUG(5,("Making default auth method list for security=domain\n"));
387 auth_method_list = str_list_make("guest sam winbind ntdomain", NULL);
390 DEBUG(5,("Making default auth method list for security=server\n"));
391 auth_method_list = str_list_make("guest sam smbserver", NULL);
394 if (lp_encrypted_passwords()) {
395 DEBUG(5,("Making default auth method list for security=user, encrypt passwords = yes\n"));
396 auth_method_list = str_list_make("guest sam", NULL);
398 DEBUG(5,("Making default auth method list for security=user, encrypt passwords = no\n"));
399 auth_method_list = str_list_make("guest unix", NULL);
403 if (lp_encrypted_passwords()) {
404 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = yes\n"));
405 auth_method_list = str_list_make("guest sam", NULL);
407 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = no\n"));
408 auth_method_list = str_list_make("guest unix", NULL);
412 DEBUG(5,("Making default auth method list for security=ADS\n"));
413 auth_method_list = str_list_make("guest sam ads winbind ntdomain", NULL);
416 DEBUG(5,("Unknown auth method!\n"));
417 return NT_STATUS_UNSUCCESSFUL;
420 DEBUG(5,("Using specified auth order\n"));
423 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_text_list(auth_context, auth_method_list))) {
424 str_list_free(&auth_method_list);
428 str_list_free(&auth_method_list);
432 /***************************************************************************
433 Make a auth_info struct with a fixed challenge
434 ***************************************************************************/
436 NTSTATUS make_auth_context_fixed(struct auth_context **auth_context, uchar chal[8])
439 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(auth_context))) {
443 (*auth_context)->challenge = data_blob(chal, 8);