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.
23 /** List of various built-in authenticaion modules */
25 const struct auth_init_function builtin_auth_init_functions[] = {
26 { "guest", auth_init_guest },
27 { "rhosts", auth_init_rhosts },
28 { "hostsequiv", auth_init_hostsequiv },
29 { "sam", auth_init_sam },
30 { "samstrict", auth_init_samstrict },
31 { "unix", auth_init_unix },
32 { "smbserver", auth_init_smbserver },
33 { "ntdomain", auth_init_ntdomain },
34 { "trustdomain", auth_init_trustdomain },
35 { "winbind", auth_init_winbind },
37 { "name_to_ntstatus", auth_init_name_to_ntstatus },
42 /****************************************************************************
43 Try to get a challenge out of the various authenticaion modules.
44 Returns a const char of length 8 bytes.
45 ****************************************************************************/
47 static const uint8 *get_ntlm_challenge(struct auth_context *auth_context)
49 DATA_BLOB challenge = data_blob(NULL, 0);
50 char *challenge_set_by = NULL;
51 auth_methods *auth_method;
54 if (auth_context->challenge.length) {
55 DEBUG(5, ("get_ntlm_challenge (auth subsystem): returning previous challenge (normal)\n"));
56 return auth_context->challenge.data;
59 for (auth_method = auth_context->auth_method_list; auth_method; auth_method = auth_method->next)
61 if (auth_method->get_chal == NULL) {
62 DEBUG(5, ("auth_get_challenge: module %s did not want to specify a challenge\n", auth_method->name));
66 DEBUG(5, ("auth_get_challenge: getting challenge from module %s\n", auth_method->name));
67 if (challenge_set_by != NULL) {
68 DEBUG(1, ("auth_get_challenge: CONFIGURATION ERROR: authenticaion method %s has already specified a challenge. Challenge by %s ignored.\n",
69 challenge_set_by, auth_method->name));
73 mem_ctx = talloc_init_named("auth_get_challenge for module %s", auth_method->name);
75 smb_panic("talloc_init_named() failed!");
78 challenge = auth_method->get_chal(auth_context, &auth_method->private_data, mem_ctx);
79 if (!challenge.length) {
80 DEBUG(3, ("auth_get_challenge: getting challenge from authenticaion method %s FAILED.\n",
83 DEBUG(5, ("auth_get_challenge: sucessfully got challenge from module %s\n", auth_method->name));
84 auth_context->challenge = challenge;
85 challenge_set_by = auth_method->name;
86 auth_context->challenge_set_method = auth_method;
88 talloc_destroy(mem_ctx);
91 if (!challenge_set_by) {
94 generate_random_buffer(chal, sizeof(chal), False);
95 auth_context->challenge = data_blob_talloc(auth_context->mem_ctx,
98 challenge_set_by = "random";
101 DEBUG(5, ("auth_context challenge created by %s\n", challenge_set_by));
102 DEBUG(5, ("challenge is: \n"));
103 dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
105 SMB_ASSERT(auth_context->challenge.length == 8);
107 auth_context->challenge_set_by=challenge_set_by;
109 return auth_context->challenge.data;
114 * Check user is in correct domain (if required)
116 * @param user Only used to fill in the debug message
118 * @param domain The domain to be verified
120 * @return True if the user can connect with that domain,
124 static BOOL check_domain_match(const char *user, const char *domain)
127 * If we aren't serving to trusted domains, we must make sure that
128 * the validation request comes from an account in the same domain
129 * as the Samba server
132 if (!lp_allow_trusted_domains() &&
133 !(strequal("", domain) ||
134 strequal(lp_workgroup(), domain) ||
135 is_netbios_alias_or_name(domain))) {
136 DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
144 * Check a user's Plaintext, LM or NTLM password.
146 * Check a user's password, as given in the user_info struct and return various
147 * interesting details in the server_info struct.
149 * This function does NOT need to be in a become_root()/unbecome_root() pair
150 * as it makes the calls itself when needed.
152 * The return value takes precedence over the contents of the server_info
153 * struct. When the return is other than NT_STATUS_OK the contents
154 * of that structure is undefined.
156 * @param user_info Contains the user supplied components, including the passwords.
157 * Must be created with make_user_info() or one of its wrappers.
159 * @param auth_info Supplies the challenges and some other data.
160 * Must be created with make_auth_info(), and the challenges should be
161 * filled in, either at creation or by calling the challenge geneation
162 * function auth_get_challenge().
164 * @param server_info If successful, contains information about the authenticaion,
165 * including a SAM_ACCOUNT struct describing the user.
167 * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
171 static NTSTATUS check_ntlm_password(const struct auth_context *auth_context,
172 const struct auth_usersupplied_info *user_info,
173 struct auth_serversupplied_info **server_info)
176 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
177 const char *pdb_username;
178 auth_methods *auth_method;
181 if (!user_info || !auth_context || !server_info) {
182 return NT_STATUS_LOGON_FAILURE;
185 DEBUG(3, ("check_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
186 user_info->client_domain.str, user_info->smb_name.str, user_info->wksta_name.str));
188 DEBUG(3, ("check_password: mapped user is: [%s]\\[%s]@[%s]\n",
189 user_info->domain.str, user_info->internal_username.str, user_info->wksta_name.str));
190 if (auth_context->challenge_set_by) {
191 DEBUG(10, ("auth_context challenge created by %s\n", auth_context->challenge_set_by));
193 DEBUG(10, ("challenge is: \n"));
194 dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
196 #ifdef DEBUG_PASSWORD
197 DEBUG(100, ("user_info has passwords of length %d and %d\n",
198 user_info->lm_resp.length, user_info->nt_resp.length));
199 DEBUG(100, ("lm:\n"));
200 dump_data(100, user_info->lm_resp.data, user_info->lm_resp.length);
201 DEBUG(100, ("nt:\n"));
202 dump_data(100, user_info->nt_resp.data, user_info->nt_resp.length);
205 /* This needs to be sorted: If it doesn't match, what should we do? */
206 if (!check_domain_match(user_info->smb_name.str, user_info->domain.str)) {
207 return NT_STATUS_LOGON_FAILURE;
210 for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next)
212 mem_ctx = talloc_init_named("%s authentication for user %s\\%s", auth_method->name,
213 user_info->domain.str, user_info->smb_name.str);
215 nt_status = auth_method->auth(auth_context, auth_method->private_data, mem_ctx, user_info, server_info);
216 if (NT_STATUS_IS_OK(nt_status)) {
217 DEBUG(3, ("check_password: %s authentication for user [%s] suceeded\n",
218 auth_method->name, user_info->smb_name.str));
220 DEBUG(5, ("check_password: %s authentication for user [%s] FAILED with error %s\n",
221 auth_method->name, user_info->smb_name.str, nt_errstr(nt_status)));
224 talloc_destroy(mem_ctx);
226 if (NT_STATUS_IS_OK(nt_status)) {
231 /* This is one of the few places the *relies* (rather than just sets defaults
232 on the value of lp_security(). This needs to change. A new paramater
234 if (lp_security() >= SEC_SERVER) {
235 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_password: PAM Account for user [%s] suceeded\n",
250 DEBUG(3, ("check_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_password: %sauthenticaion 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_password: Authenticaion 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);
283 *auth_context = NULL;
286 /***************************************************************************
287 Make a auth_info struct
288 ***************************************************************************/
290 static NTSTATUS make_auth_context(struct auth_context **auth_context)
294 mem_ctx = talloc_init_named("authentication context");
296 *auth_context = talloc(mem_ctx, sizeof(**auth_context));
297 if (!*auth_context) {
298 DEBUG(0,("make_auth_context: talloc failed!\n"));
299 talloc_destroy(mem_ctx);
300 return NT_STATUS_NO_MEMORY;
302 ZERO_STRUCTP(*auth_context);
304 (*auth_context)->mem_ctx = mem_ctx;
305 (*auth_context)->check_ntlm_password = check_ntlm_password;
306 (*auth_context)->get_ntlm_challenge = get_ntlm_challenge;
307 (*auth_context)->free = free_auth_context;
312 /***************************************************************************
313 Make a auth_info struct for the auth subsystem
314 ***************************************************************************/
316 static NTSTATUS make_auth_context_text_list(struct auth_context **auth_context, char **text_list)
318 auth_methods *list = NULL;
319 auth_methods *t = NULL;
325 DEBUG(2,("No auth method list!?\n"));
326 return NT_STATUS_UNSUCCESSFUL;
329 if (!NT_STATUS_IS_OK(nt_status = make_auth_context(auth_context))) {
333 for (;*text_list; text_list++)
335 DEBUG(5,("Attempting to find an auth method to match %s\n", *text_list));
336 for (i = 0; builtin_auth_init_functions[i].name; i++)
338 if (strequal(builtin_auth_init_functions[i].name, *text_list))
340 DEBUG(5,("Found auth method %s (at pos %d)\n", *text_list, i));
341 if (builtin_auth_init_functions[i].init(*auth_context, &t)) {
342 DEBUG(5,("auth method %s has a valid init\n", *text_list));
343 t->name = builtin_auth_init_functions[i].name;
344 DLIST_ADD_END(list, t, tmp);
346 DEBUG(0,("auth method %s did not correctly init\n", *text_list));
353 (*auth_context)->auth_method_list = list;
358 /***************************************************************************
359 Make a auth_context struct for the auth subsystem
360 ***************************************************************************/
362 NTSTATUS make_auth_context_subsystem(struct auth_context **auth_context)
364 char **auth_method_list = NULL;
367 if (lp_auth_methods() && !lp_list_copy(&auth_method_list, lp_auth_methods())) {
368 return NT_STATUS_NO_MEMORY;
371 if (auth_method_list == NULL) {
372 switch (lp_security())
375 DEBUG(5,("Making default auth method list for security=domain\n"));
376 auth_method_list = lp_list_make("guest samstrict ntdomain");
379 DEBUG(5,("Making default auth method list for security=server\n"));
380 auth_method_list = lp_list_make("guest samstrict smbserver");
383 if (lp_encrypted_passwords()) {
384 DEBUG(5,("Making default auth method list for security=user, encrypt passwords = yes\n"));
385 auth_method_list = lp_list_make("guest sam");
387 DEBUG(5,("Making default auth method list for security=user, encrypt passwords = no\n"));
388 auth_method_list = lp_list_make("guest unix");
392 if (lp_encrypted_passwords()) {
393 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = yes\n"));
394 auth_method_list = lp_list_make("guest sam");
396 DEBUG(5,("Making default auth method list for security=share, encrypt passwords = no\n"));
397 auth_method_list = lp_list_make("guest unix");
401 DEBUG(5,("Making default auth method list for security=ADS\n"));
402 auth_method_list = lp_list_make("guest samstrict ads ntdomain");
405 DEBUG(5,("Unknown auth method!\n"));
406 return NT_STATUS_UNSUCCESSFUL;
409 DEBUG(5,("Using specified auth order\n"));
412 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_text_list(auth_context, auth_method_list))) {
413 lp_list_free(&auth_method_list);
417 lp_list_free(&auth_method_list);
421 /***************************************************************************
422 Make a auth_info struct with a random challenge
423 ***************************************************************************/
425 NTSTATUS make_auth_context_random(struct auth_context **auth_context)
429 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(auth_context))) {
433 generate_random_buffer(chal, sizeof(chal), False);
434 (*auth_context)->challenge = data_blob(chal, sizeof(chal));
436 (*auth_context)->challenge_set_by = "random";
441 /***************************************************************************
442 Make a auth_info struct with a fixed challenge
443 ***************************************************************************/
445 NTSTATUS make_auth_context_fixed(struct auth_context **auth_context, uchar chal[8])
448 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(auth_context))) {
452 (*auth_context)->challenge = data_blob(chal, 8);