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 static 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 { "samstrict_dc", auth_init_samstrict_dc },
35 { "unix", auth_init_unix },
36 // { "smbserver", auth_init_smbserver },
37 // { "ntdomain", auth_init_ntdomain },
38 // { "trustdomain", auth_init_trustdomain },
39 // { "winbind", auth_init_winbind },
41 { "name_to_ntstatus", auth_init_name_to_ntstatus },
42 { "fixed_challenge", auth_init_fixed_challenge },
44 { "plugin", auth_init_plugin },
48 /****************************************************************************
49 Try to get a challenge out of the various authentication modules.
50 Returns a const char of length 8 bytes.
51 ****************************************************************************/
53 static const uint8 *get_ntlm_challenge(struct auth_context *auth_context)
55 DATA_BLOB challenge = data_blob(NULL, 0);
56 const char *challenge_set_by = NULL;
57 auth_methods *auth_method;
60 if (auth_context->challenge.length) {
61 DEBUG(5, ("get_ntlm_challenge (auth subsystem): returning previous challenge by module %s (normal)\n",
62 auth_context->challenge_set_by));
63 return auth_context->challenge.data;
66 for (auth_method = auth_context->auth_method_list; auth_method; auth_method = auth_method->next) {
67 if (auth_method->get_chal == NULL) {
68 DEBUG(5, ("auth_get_challenge: module %s did not want to specify a challenge\n", auth_method->name));
72 DEBUG(5, ("auth_get_challenge: getting challenge from module %s\n", auth_method->name));
73 if (challenge_set_by != NULL) {
74 DEBUG(1, ("auth_get_challenge: CONFIGURATION ERROR: authentication method %s has already specified a challenge. Challenge by %s ignored.\n",
75 challenge_set_by, auth_method->name));
79 mem_ctx = talloc_init("auth_get_challenge for module %s", auth_method->name);
81 smb_panic("talloc_init() failed!");
84 challenge = auth_method->get_chal(auth_context, &auth_method->private_data, mem_ctx);
85 if (!challenge.length) {
86 DEBUG(3, ("auth_get_challenge: getting challenge from authentication method %s FAILED.\n",
89 DEBUG(5, ("auth_get_challenge: sucessfully got challenge from module %s\n", auth_method->name));
90 auth_context->challenge = challenge;
91 challenge_set_by = auth_method->name;
92 auth_context->challenge_set_method = auth_method;
94 talloc_destroy(mem_ctx);
97 if (!challenge_set_by) {
100 generate_random_buffer(chal, sizeof(chal), False);
101 auth_context->challenge = data_blob_talloc(auth_context->mem_ctx,
104 challenge_set_by = "random";
107 DEBUG(5, ("auth_context challenge created by %s\n", challenge_set_by));
108 DEBUG(5, ("challenge is: \n"));
109 dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
111 SMB_ASSERT(auth_context->challenge.length == 8);
113 auth_context->challenge_set_by=challenge_set_by;
115 return auth_context->challenge.data;
120 * Check user is in correct domain (if required)
122 * @param user Only used to fill in the debug message
124 * @param domain The domain to be verified
126 * @return True if the user can connect with that domain,
130 static BOOL check_domain_match(const char *user, const char *domain)
133 * If we aren't serving to trusted domains, we must make sure that
134 * the validation request comes from an account in the same domain
135 * as the Samba server
138 if (!lp_allow_trusted_domains() &&
139 !(strequal("", domain) ||
140 strequal(lp_workgroup(), domain) ||
141 is_myname(domain))) {
142 DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
150 * Check a user's Plaintext, LM or NTLM password.
152 * Check a user's password, as given in the user_info struct and return various
153 * interesting details in the server_info struct.
155 * This function does NOT need to be in a become_root()/unbecome_root() pair
156 * as it makes the calls itself when needed.
158 * The return value takes precedence over the contents of the server_info
159 * struct. When the return is other than NT_STATUS_OK the contents
160 * of that structure is undefined.
162 * @param user_info Contains the user supplied components, including the passwords.
163 * Must be created with make_user_info() or one of its wrappers.
165 * @param auth_context Supplies the challenges and some other data.
166 * Must be created with make_auth_context(), and the challenges should be
167 * filled in, either at creation or by calling the challenge geneation
168 * function auth_get_challenge().
170 * @param server_info If successful, contains information about the authentication,
171 * including a SAM_ACCOUNT struct describing the user.
173 * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
177 static NTSTATUS check_ntlm_password(const struct auth_context *auth_context,
178 const struct auth_usersupplied_info *user_info,
179 struct auth_serversupplied_info **server_info)
182 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
183 const char *pdb_username;
184 auth_methods *auth_method;
187 if (!user_info || !auth_context || !server_info)
188 return NT_STATUS_LOGON_FAILURE;
190 DEBUG(3, ("check_ntlm_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));
193 DEBUG(3, ("check_ntlm_password: mapped user is: [%s]\\[%s]@[%s]\n",
194 user_info->domain.str, user_info->internal_username.str, user_info->wksta_name.str));
196 if (auth_context->challenge.length != 8) {
197 DEBUG(0, ("check_ntlm_password: Invalid challenge stored for this auth context - cannot continue\n"));
198 return NT_STATUS_LOGON_FAILURE;
201 if (auth_context->challenge_set_by)
202 DEBUG(10, ("check_ntlm_password: auth_context challenge created by %s\n",
203 auth_context->challenge_set_by));
205 DEBUG(10, ("challenge is: \n"));
206 dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
208 #ifdef DEBUG_PASSWORD
209 DEBUG(100, ("user_info has passwords of length %d and %d\n",
210 user_info->lm_resp.length, user_info->nt_resp.length));
211 DEBUG(100, ("lm:\n"));
212 dump_data(100, user_info->lm_resp.data, user_info->lm_resp.length);
213 DEBUG(100, ("nt:\n"));
214 dump_data(100, user_info->nt_resp.data, user_info->nt_resp.length);
217 /* This needs to be sorted: If it doesn't match, what should we do? */
218 if (!check_domain_match(user_info->smb_name.str, user_info->domain.str))
219 return NT_STATUS_LOGON_FAILURE;
221 for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next) {
222 mem_ctx = talloc_init("%s authentication for user %s\\%s", auth_method->name,
223 user_info->domain.str, user_info->smb_name.str);
225 nt_status = auth_method->auth(auth_context, auth_method->private_data, mem_ctx, user_info, server_info);
226 if (NT_STATUS_IS_OK(nt_status)) {
227 DEBUG(3, ("check_ntlm_password: %s authentication for user [%s] suceeded\n",
228 auth_method->name, user_info->smb_name.str));
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))
240 /* This is one of the few places the *relies* (rather than just sets defaults
241 on the value of lp_security(). This needs to change. A new paramater
243 if (lp_security() >= SEC_SERVER)
244 smb_user_control(user_info, *server_info, nt_status);
246 if (NT_STATUS_IS_OK(nt_status)) {
247 pdb_username = pdb_get_username((*server_info)->sam_account);
248 if (!(*server_info)->guest) {
249 /* We might not be root if we are an RPC call */
251 nt_status = smb_pam_accountcheck(pdb_username);
254 if (NT_STATUS_IS_OK(nt_status)) {
255 DEBUG(5, ("check_ntlm_password: PAM Account for user [%s] suceeded\n",
258 DEBUG(3, ("check_ntlm_password: PAM Account for user [%s] FAILED with error %s\n",
259 pdb_username, nt_errstr(nt_status)));
263 if (NT_STATUS_IS_OK(nt_status)) {
264 DEBUG((*server_info)->guest ? 5 : 2,
265 ("check_ntlm_password: %sauthentication for user [%s] -> [%s] -> [%s] suceeded\n",
266 (*server_info)->guest ? "guest " : "",
267 user_info->smb_name.str,
268 user_info->internal_username.str,
273 if (!NT_STATUS_IS_OK(nt_status)) {
274 DEBUG(2, ("check_ntlm_password: Authentication for user [%s] -> [%s] FAILED with error %s\n",
275 user_info->smb_name.str, user_info->internal_username.str,
276 nt_errstr(nt_status)));
277 ZERO_STRUCTP(server_info);
282 /***************************************************************************
283 Clear out a auth_context, and destroy the attached TALLOC_CTX
284 ***************************************************************************/
286 static void free_auth_context(struct auth_context **auth_context)
288 if (*auth_context != NULL)
289 talloc_destroy((*auth_context)->mem_ctx);
290 *auth_context = NULL;
293 /***************************************************************************
294 Make a auth_info struct
295 ***************************************************************************/
297 static NTSTATUS make_auth_context(struct auth_context **auth_context)
301 mem_ctx = talloc_init("authentication context");
303 *auth_context = talloc(mem_ctx, sizeof(**auth_context));
304 if (!*auth_context) {
305 DEBUG(0,("make_auth_context: talloc failed!\n"));
306 talloc_destroy(mem_ctx);
307 return NT_STATUS_NO_MEMORY;
309 ZERO_STRUCTP(*auth_context);
311 (*auth_context)->mem_ctx = mem_ctx;
312 (*auth_context)->check_ntlm_password = check_ntlm_password;
313 (*auth_context)->get_ntlm_challenge = get_ntlm_challenge;
314 (*auth_context)->free = free_auth_context;
319 /***************************************************************************
320 Make a auth_info struct for the auth subsystem
321 ***************************************************************************/
323 static NTSTATUS make_auth_context_text_list(struct auth_context **auth_context, char **text_list)
325 auth_methods *list = NULL;
326 auth_methods *t = NULL;
332 DEBUG(2,("make_auth_context_text_list: No auth method list!?\n"));
333 return NT_STATUS_UNSUCCESSFUL;
336 if (!NT_STATUS_IS_OK(nt_status = make_auth_context(auth_context)))
339 for (;*text_list; text_list++) {
340 DEBUG(5,("make_auth_context_text_list: Attempting to find an auth method to match %s\n",
342 for (i = 0; builtin_auth_init_functions[i].name; i++) {
343 char *module_name = smb_xstrdup(*text_list);
344 char *module_params = NULL;
347 p = strchr(module_name, ':');
351 trim_string(module_params, " ", " ");
354 trim_string(module_name, " ", " ");
356 if (strequal(builtin_auth_init_functions[i].name, module_name)) {
357 DEBUG(5,("make_auth_context_text_list: Found auth method %s (at pos %d)\n", *text_list, i));
358 if (NT_STATUS_IS_OK(builtin_auth_init_functions[i].init(*auth_context, module_params, &t))) {
359 DEBUG(5,("make_auth_context_text_list: auth method %s has a valid init\n",
361 DLIST_ADD_END(list, t, tmp);
363 DEBUG(0,("make_auth_context_text_list: auth method %s did not correctly init\n",
368 SAFE_FREE(module_name);
372 (*auth_context)->auth_method_list = list;
377 /***************************************************************************
378 Make a auth_context struct for the auth subsystem
379 ***************************************************************************/
381 NTSTATUS make_auth_context_subsystem(struct auth_context **auth_context)
383 char **auth_method_list = NULL;
386 if (lp_auth_methods() && !str_list_copy(&auth_method_list, lp_auth_methods())) {
387 return NT_STATUS_NO_MEMORY;
390 if (auth_method_list == NULL) {
391 switch (lp_security())
394 DEBUG(5,("Making default auth method list for security=domain\n"));
395 auth_method_list = str_list_make("guest sam winbind ntdomain", NULL);
398 DEBUG(5,("Making default auth method list for security=server\n"));
399 auth_method_list = str_list_make("guest sam smbserver", NULL);
402 if (lp_encrypted_passwords()) {
403 DEBUG(5,("Making default auth method list for security=user, encrypt passwords = yes\n"));
404 auth_method_list = str_list_make("guest sam", NULL);
406 DEBUG(5,("Making default auth method list for security=user, encrypt passwords = no\n"));
407 auth_method_list = str_list_make("guest unix", NULL);
411 if (lp_encrypted_passwords()) {
412 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = yes\n"));
413 auth_method_list = str_list_make("guest sam", NULL);
415 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = no\n"));
416 auth_method_list = str_list_make("guest unix", NULL);
420 DEBUG(5,("Making default auth method list for security=ADS\n"));
421 auth_method_list = str_list_make("guest sam ads winbind ntdomain", NULL);
424 DEBUG(5,("Unknown auth method!\n"));
425 return NT_STATUS_UNSUCCESSFUL;
428 DEBUG(5,("Using specified auth order\n"));
431 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_text_list(auth_context, auth_method_list))) {
432 str_list_free(&auth_method_list);
436 str_list_free(&auth_method_list);
440 /***************************************************************************
441 Make a auth_info struct with a fixed challenge
442 ***************************************************************************/
444 NTSTATUS make_auth_context_fixed(struct auth_context **auth_context, uchar chal[8])
447 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(auth_context))) {
451 (*auth_context)->challenge = data_blob(chal, 8);
452 (*auth_context)->challenge_set_by = "fixed";