s4:smb_server: s/SMBkeepalive/NBSSkeepalive
[Samba/gebeck_regimport.git] / source3 / auth / auth_server.c
blob1b7993bb9cd8e3f1351739c4d4a40b100f01366a
1 /*
2 Unix SMB/CIFS implementation.
3 Authenticate to a remote server
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Andrew Bartlett 2001
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "includes.h"
22 #include "auth.h"
23 #include "system/passwd.h"
24 #include "smbd/smbd.h"
25 #include "libsmb/libsmb.h"
27 #undef DBGC_CLASS
28 #define DBGC_CLASS DBGC_AUTH
30 extern userdom_struct current_user_info;
32 /****************************************************************************
33 Support for server level security.
34 ****************************************************************************/
36 static struct cli_state *server_cryptkey(TALLOC_CTX *mem_ctx)
38 struct cli_state *cli = NULL;
39 char *desthost = NULL;
40 struct sockaddr_storage dest_ss;
41 const char *p;
42 char *pserver = NULL;
43 bool connected_ok = False;
44 struct named_mutex *mutex = NULL;
45 NTSTATUS status;
47 pserver = talloc_strdup(mem_ctx, lp_passwordserver());
48 p = pserver;
50 while(next_token_talloc(mem_ctx, &p, &desthost, LIST_SEP)) {
52 desthost = talloc_sub_basic(mem_ctx,
53 current_user_info.smb_name,
54 current_user_info.domain,
55 desthost);
56 if (!desthost) {
57 return NULL;
59 strupper_m(desthost);
61 if (strequal(desthost, myhostname())) {
62 DEBUG(1,("Password server loop - disabling "
63 "password server %s\n", desthost));
64 continue;
67 if(!resolve_name( desthost, &dest_ss, 0x20, false)) {
68 DEBUG(1,("server_cryptkey: Can't resolve address for %s\n",desthost));
69 continue;
72 if (ismyaddr((struct sockaddr *)(void *)&dest_ss)) {
73 DEBUG(1,("Password server loop - disabling password server %s\n",desthost));
74 continue;
77 /* we use a mutex to prevent two connections at once - when a
78 Win2k PDC get two connections where one hasn't completed a
79 session setup yet it will send a TCP reset to the first
80 connection (tridge) */
82 mutex = grab_named_mutex(talloc_tos(), desthost, 10);
83 if (mutex == NULL) {
84 return NULL;
87 status = cli_connect_nb(desthost, &dest_ss, 0, 0x20,
88 lp_netbios_name(), Undefined, &cli);
89 if (NT_STATUS_IS_OK(status)) {
90 DEBUG(3,("connected to password server %s\n",desthost));
91 connected_ok = True;
92 break;
94 DEBUG(10,("server_cryptkey: failed to connect to server %s. Error %s\n",
95 desthost, nt_errstr(status) ));
96 TALLOC_FREE(mutex);
99 if (!connected_ok) {
100 DEBUG(0,("password server not available\n"));
101 return NULL;
104 /* security = server just can't function with spnego */
105 cli->use_spnego = False;
107 DEBUG(3,("got session\n"));
109 status = cli_negprot(cli);
111 if (!NT_STATUS_IS_OK(status)) {
112 TALLOC_FREE(mutex);
113 DEBUG(1, ("%s rejected the negprot: %s\n",
114 desthost, nt_errstr(status)));
115 cli_shutdown(cli);
116 return NULL;
119 if (cli->protocol < PROTOCOL_LANMAN2 ||
120 !(cli->sec_mode & NEGOTIATE_SECURITY_USER_LEVEL)) {
121 TALLOC_FREE(mutex);
122 DEBUG(1,("%s isn't in user level security mode\n",desthost));
123 cli_shutdown(cli);
124 return NULL;
127 /* Get the first session setup done quickly, to avoid silly
128 Win2k bugs. (The next connection to the server will kill
129 this one...
132 status = cli_session_setup(cli, "", "", 0, "", 0, "");
133 if (!NT_STATUS_IS_OK(status)) {
134 TALLOC_FREE(mutex);
135 DEBUG(0,("%s rejected the initial session setup (%s)\n",
136 desthost, nt_errstr(status)));
137 cli_shutdown(cli);
138 return NULL;
141 TALLOC_FREE(mutex);
143 DEBUG(3,("password server OK\n"));
145 return cli;
148 struct server_security_state {
149 struct cli_state *cli;
152 /****************************************************************************
153 Send a 'keepalive' packet down the cli pipe.
154 ****************************************************************************/
156 static bool send_server_keepalive(const struct timeval *now,
157 void *private_data)
159 struct server_security_state *state = talloc_get_type_abort(
160 private_data, struct server_security_state);
161 NTSTATUS status;
162 unsigned char garbage[16];
164 if (!cli_state_is_connected(state->cli)) {
165 return false;
168 /* Ping the server to keep the connection alive using SMBecho. */
169 memset(garbage, 0xf0, sizeof(garbage));
170 status = cli_echo(state->cli, 1, data_blob_const(garbage, sizeof(garbage)));
171 if (NT_STATUS_IS_OK(status)) {
172 return true;
175 DEBUG(2,("send_server_keepalive: password server SMBecho failed: %s\n",
176 nt_errstr(status)));
177 cli_shutdown(state->cli);
178 state->cli = NULL;
179 return false;
182 static int destroy_server_security(struct server_security_state *state)
184 if (state->cli) {
185 cli_shutdown(state->cli);
187 return 0;
190 static struct server_security_state *make_server_security_state(struct cli_state *cli)
192 struct server_security_state *result;
194 if (!(result = talloc(NULL, struct server_security_state))) {
195 DEBUG(0, ("talloc failed\n"));
196 cli_shutdown(cli);
197 return NULL;
200 result->cli = cli;
201 talloc_set_destructor(result, destroy_server_security);
203 if (lp_keepalive() != 0) {
204 struct timeval interval;
205 interval.tv_sec = lp_keepalive();
206 interval.tv_usec = 0;
208 if (event_add_idle(server_event_context(), result, interval,
209 "server_security_keepalive",
210 send_server_keepalive,
211 result) == NULL) {
212 DEBUG(0, ("event_add_idle failed\n"));
213 TALLOC_FREE(result);
214 return NULL;
218 return result;
221 /****************************************************************************
222 Get the challenge out of a password server.
223 ****************************************************************************/
225 static DATA_BLOB auth_get_challenge_server(const struct auth_context *auth_context,
226 void **my_private_data,
227 TALLOC_CTX *mem_ctx)
229 struct cli_state *cli = server_cryptkey(mem_ctx);
231 if (cli) {
232 DEBUG(3,("using password server validation\n"));
234 if ((cli->sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) == 0) {
235 /* We can't work with unencrypted password servers
236 unless 'encrypt passwords = no' */
237 DEBUG(5,("make_auth_info_server: Server is unencrypted, no challenge available..\n"));
239 /* However, it is still a perfectly fine connection
240 to pass that unencrypted password over */
241 *my_private_data =
242 (void *)make_server_security_state(cli);
243 return data_blob_null;
244 } else if (cli->secblob.length < 8) {
245 /* We can't do much if we don't get a full challenge */
246 DEBUG(2,("make_auth_info_server: Didn't receive a full challenge from server\n"));
247 cli_shutdown(cli);
248 return data_blob_null;
251 if (!(*my_private_data = (void *)make_server_security_state(cli))) {
252 return data_blob(NULL,0);
255 /* The return must be allocated on the caller's mem_ctx, as our own will be
256 destoyed just after the call. */
257 return data_blob_talloc(discard_const_p(TALLOC_CTX, auth_context), cli->secblob.data,8);
258 } else {
259 return data_blob_null;
264 /****************************************************************************
265 Check for a valid username and password in security=server mode.
266 - Validate a password with the password server.
267 ****************************************************************************/
269 static NTSTATUS check_smbserver_security(const struct auth_context *auth_context,
270 void *my_private_data,
271 TALLOC_CTX *mem_ctx,
272 const struct auth_usersupplied_info *user_info,
273 struct auth_serversupplied_info **server_info)
275 struct server_security_state *state = talloc_get_type_abort(
276 my_private_data, struct server_security_state);
277 struct cli_state *cli;
278 static bool tested_password_server = False;
279 static bool bad_password_server = False;
280 NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
281 bool locally_made_cli = False;
283 DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
285 cli = state->cli;
287 if (cli) {
288 } else {
289 cli = server_cryptkey(mem_ctx);
290 locally_made_cli = True;
293 if (!cli_state_is_connected(cli)) {
294 DEBUG(1,("password server is not connected (cli not initialised)\n"));
295 return NT_STATUS_LOGON_FAILURE;
298 if ((cli->sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) == 0) {
299 if (user_info->password_state != AUTH_PASSWORD_PLAIN) {
300 DEBUG(1,("password server %s is plaintext, but we are encrypted. This just can't work :-(\n", cli->desthost));
301 return NT_STATUS_LOGON_FAILURE;
303 } else {
304 if (memcmp(cli->secblob.data, auth_context->challenge.data, 8) != 0) {
305 DEBUG(1,("the challenge that the password server (%s) supplied us is not the one we gave our client. This just can't work :-(\n", cli->desthost));
306 return NT_STATUS_LOGON_FAILURE;
311 * Attempt a session setup with a totally incorrect password.
312 * If this succeeds with the guest bit *NOT* set then the password
313 * server is broken and is not correctly setting the guest bit. We
314 * need to detect this as some versions of NT4.x are broken. JRA.
317 /* I sure as hell hope that there aren't servers out there that take
318 * NTLMv2 and have this bug, as we don't test for that...
319 * - abartlet@samba.org
322 if ((!tested_password_server) && (lp_paranoid_server_security())) {
323 unsigned char badpass[24];
324 char *baduser = NULL;
326 memset(badpass, 0x1f, sizeof(badpass));
328 if((user_info->password.response.nt.length == sizeof(badpass)) &&
329 !memcmp(badpass, user_info->password.response.nt.data, sizeof(badpass))) {
331 * Very unlikely, our random bad password is the same as the users
332 * password.
334 memset(badpass, badpass[0]+1, sizeof(badpass));
337 baduser = talloc_asprintf(mem_ctx,
338 "%s%s",
339 INVALID_USER_PREFIX,
340 lp_netbios_name());
341 if (!baduser) {
342 return NT_STATUS_NO_MEMORY;
345 if (NT_STATUS_IS_OK(cli_session_setup(cli, baduser,
346 (char *)badpass,
347 sizeof(badpass),
348 (char *)badpass,
349 sizeof(badpass),
350 user_info->mapped.domain_name))) {
353 * We connected to the password server so we
354 * can say we've tested it.
356 tested_password_server = True;
358 if (!cli->is_guestlogin) {
359 DEBUG(0,("server_validate: password server %s allows users as non-guest \
360 with a bad password.\n", cli->desthost));
361 DEBUG(0,("server_validate: This is broken (and insecure) behaviour. Please do not \
362 use this machine as the password server.\n"));
363 cli_ulogoff(cli);
366 * Password server has the bug.
368 bad_password_server = True;
369 return NT_STATUS_LOGON_FAILURE;
371 cli_ulogoff(cli);
373 } else {
376 * We have already tested the password server.
377 * Fail immediately if it has the bug.
380 if(bad_password_server) {
381 DEBUG(0,("server_validate: [1] password server %s allows users as non-guest \
382 with a bad password.\n", cli->desthost));
383 DEBUG(0,("server_validate: [1] This is broken (and insecure) behaviour. Please do not \
384 use this machine as the password server.\n"));
385 return NT_STATUS_LOGON_FAILURE;
390 * Now we know the password server will correctly set the guest bit, or is
391 * not guest enabled, we can try with the real password.
393 switch (user_info->password_state) {
394 case AUTH_PASSWORD_PLAIN:
395 /* Plaintext available */
396 nt_status = cli_session_setup(
397 cli, user_info->client.account_name,
398 user_info->password.plaintext,
399 strlen(user_info->password.plaintext),
400 NULL, 0, user_info->mapped.domain_name);
401 break;
403 /* currently the hash values include a challenge-response as well */
404 case AUTH_PASSWORD_HASH:
405 case AUTH_PASSWORD_RESPONSE:
406 nt_status = cli_session_setup(
407 cli, user_info->client.account_name,
408 (char *)user_info->password.response.lanman.data,
409 user_info->password.response.lanman.length,
410 (char *)user_info->password.response.nt.data,
411 user_info->password.response.nt.length,
412 user_info->mapped.domain_name);
413 break;
414 default:
415 DEBUG(0,("user_info constructed for user '%s' was invalid - password_state=%u invalid.\n",user_info->mapped.account_name, user_info->password_state));
416 nt_status = NT_STATUS_INTERNAL_ERROR;
419 if (!NT_STATUS_IS_OK(nt_status)) {
420 DEBUG(1,("password server %s rejected the password: %s\n",
421 cli->desthost, nt_errstr(nt_status)));
424 /* if logged in as guest then reject */
425 if (cli->is_guestlogin) {
426 DEBUG(1,("password server %s gave us guest only\n", cli->desthost));
427 nt_status = NT_STATUS_LOGON_FAILURE;
430 cli_ulogoff(cli);
432 if (NT_STATUS_IS_OK(nt_status)) {
433 char *real_username = NULL;
434 struct passwd *pass = NULL;
436 if ( (pass = smb_getpwnam(talloc_tos(), user_info->mapped.account_name,
437 &real_username, True )) != NULL )
439 nt_status = make_server_info_pw(server_info, pass->pw_name, pass);
440 TALLOC_FREE(pass);
441 TALLOC_FREE(real_username);
443 else
445 nt_status = NT_STATUS_NO_SUCH_USER;
449 if (locally_made_cli) {
450 cli_shutdown(cli);
453 return(nt_status);
456 static NTSTATUS auth_init_smbserver(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
458 struct auth_methods *result;
460 result = talloc_zero(auth_context, struct auth_methods);
461 if (result == NULL) {
462 return NT_STATUS_NO_MEMORY;
464 result->name = "smbserver";
465 result->auth = check_smbserver_security;
466 result->get_chal = auth_get_challenge_server;
468 *auth_method = result;
469 return NT_STATUS_OK;
472 NTSTATUS auth_server_init(void)
474 return smb_register_auth(AUTH_INTERFACE_VERSION, "smbserver", auth_init_smbserver);