2 Unix SMB/CIFS implementation.
4 Winbind daemon connection manager
6 Copyright (C) Tim Potter 2001
7 Copyright (C) Andrew Bartlett 2002
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 We need to manage connections to domain controllers without having to
26 mess up the main winbindd code with other issues. The aim of the
27 connection manager is to:
29 - make connections to domain controllers and cache them
30 - re-establish connections when networks or servers go down
31 - centralise the policy on connection timeouts, domain controller
33 - manage re-entrancy for when winbindd becomes able to handle
34 multiple outstanding rpc requests
36 Why not have connection management as part of the rpc layer like tng?
37 Good question. This code may morph into libsmb/rpc_cache.c or something
38 like that but at the moment it's simply staying as part of winbind. I
39 think the TNG architecture of forcing every user of the rpc layer to use
40 the connection caching system is a bad idea. It should be an optional
41 method of using the routines.
43 The TNG design is quite good but I disagree with some aspects of the
51 - I'm pretty annoyed by all the make_nmb_name() stuff. It should be
52 moved down into another function.
54 - Take care when destroying cli_structs as they can be shared between
62 #define DBGC_CLASS DBGC_WINBIND
64 /* Global list of connections. Initially a DLIST but can become a hash
65 table or whatever later. */
67 struct winbindd_cm_conn {
68 struct winbindd_cm_conn *prev, *next;
72 size_t mutex_ref_count;
73 struct cli_state *cli;
77 static struct winbindd_cm_conn *cm_conns = NULL;
80 /* Choose between anonymous or authenticated connections. We need to use
81 an authenticated connection if DCs have the RestrictAnonymous registry
82 entry set > 0, or the "Additional restrictions for anonymous
83 connections" set in the win2k Local Security Policy.
85 Caller to free() result in domain, username, password
88 static void cm_get_ipc_userpass(char **username, char **domain, char **password)
90 *username = secrets_fetch(SECRETS_AUTH_USER, NULL);
91 *domain = secrets_fetch(SECRETS_AUTH_DOMAIN, NULL);
92 *password = secrets_fetch(SECRETS_AUTH_PASSWORD, NULL);
94 if (*username && **username) {
96 if (!*domain || !**domain)
97 *domain = smb_xstrdup(lp_workgroup());
99 if (!*password || !**password)
100 *password = smb_xstrdup("");
102 DEBUG(3, ("IPC$ connections done by user %s\\%s\n",
103 *domain, *username));
106 DEBUG(3, ("IPC$ connections done anonymously\n"));
107 *username = smb_xstrdup("");
108 *domain = smb_xstrdup("");
109 *password = smb_xstrdup("");
113 /* Open a connction to the remote server, cache failures for 30 seconds */
115 static NTSTATUS cm_open_connection(const char *domain, const int pipe_index,
116 struct winbindd_cm_conn *new_conn)
119 char *ipc_username, *ipc_domain, *ipc_password;
120 struct in_addr dc_ip;
126 fstrcpy(new_conn->domain, domain);
127 fstrcpy(new_conn->pipe_name, get_pipe_name_from_index(pipe_index));
129 /* connection failure cache has been moved inside of get_dc_name
130 so we can deal with half dead DC's --jerry */
132 if (!get_dc_name(domain, new_conn->controller, &dc_ip)) {
133 result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
134 add_failed_connection_entry(domain, "", result);
138 /* Initialise SMB connection */
140 cm_get_ipc_userpass(&ipc_username, &ipc_domain, &ipc_password);
142 DEBUG(5, ("connecting to %s from %s with username [%s]\\[%s]\n",
143 new_conn->controller, global_myname(), ipc_domain, ipc_username));
145 for (i = 0; retry && (i < 3); i++) {
147 if (!(got_mutex = secrets_named_mutex(new_conn->controller, WINBIND_SERVER_MUTEX_WAIT_TIME))) {
148 DEBUG(0,("cm_open_connection: mutex grab failed for %s\n", new_conn->controller));
149 result = NT_STATUS_POSSIBLE_DEADLOCK;
153 result = cli_full_connection(&new_conn->cli, global_myname(), new_conn->controller,
154 &dc_ip, 0, "IPC$", "IPC", ipc_username, ipc_domain,
155 ipc_password, CLI_FULL_CONNECTION_ANNONYMOUS_FALLBACK, &retry);
157 secrets_named_mutex_release(new_conn->controller);
159 if (NT_STATUS_IS_OK(result))
163 SAFE_FREE(ipc_username);
164 SAFE_FREE(ipc_domain);
165 SAFE_FREE(ipc_password);
167 if (!NT_STATUS_IS_OK(result)) {
168 add_failed_connection_entry(domain, new_conn->controller, result);
172 if ( !cli_nt_session_open (new_conn->cli, pipe_index) ) {
173 result = NT_STATUS_PIPE_NOT_AVAILABLE;
175 * only cache a failure if we are not trying to open the
176 * **win2k** specific lsarpc UUID. This could be an NT PDC
177 * and therefore a failure is normal. This should probably
178 * be abstracted to a check for 2k specific pipes and wondering
179 * if the PDC is an NT4 box. but since there is only one 2k
180 * specific UUID right now, i'm not going to bother. --jerry
182 if ( !is_win2k_pipe(pipe_index) )
183 add_failed_connection_entry(domain, new_conn->controller, result);
184 cli_shutdown(new_conn->cli);
191 /* Return true if a connection is still alive */
193 static BOOL connection_ok(struct winbindd_cm_conn *conn)
196 smb_panic("Invalid parameter passed to connection_ok(): conn was NULL!\n");
201 DEBUG(3, ("Connection to %s for domain %s (pipe %s) has NULL conn->cli!\n",
202 conn->controller, conn->domain, conn->pipe_name));
206 if (!conn->cli->initialised) {
207 DEBUG(3, ("Connection to %s for domain %s (pipe %s) was never initialised!\n",
208 conn->controller, conn->domain, conn->pipe_name));
212 if (conn->cli->fd == -1) {
213 DEBUG(3, ("Connection to %s for domain %s (pipe %s) has died or was never started (fd == -1)\n",
214 conn->controller, conn->domain, conn->pipe_name));
221 /* Search the cache for a connection. If there is a broken one,
222 shut it down properly and return NULL. */
224 static void find_cm_connection(const char *domain, const char *pipe_name,
225 struct winbindd_cm_conn **conn_out)
227 struct winbindd_cm_conn *conn;
229 for (conn = cm_conns; conn; ) {
230 if (strequal(conn->domain, domain) &&
231 strequal(conn->pipe_name, pipe_name)) {
232 if (!connection_ok(conn)) {
233 /* Dead connection - remove it. */
234 struct winbindd_cm_conn *conn_temp = conn->next;
236 cli_shutdown(conn->cli);
237 DLIST_REMOVE(cm_conns, conn);
239 conn = conn_temp; /* Keep the loop moving */
251 /* Initialize a new connection up to the RPC BIND. */
253 static NTSTATUS new_cm_connection(const char *domain, const char *pipe_name,
254 struct winbindd_cm_conn **conn_out)
256 struct winbindd_cm_conn *conn;
259 if (!(conn = malloc(sizeof(*conn))))
260 return NT_STATUS_NO_MEMORY;
264 if (!NT_STATUS_IS_OK(result = cm_open_connection(domain, get_pipe_index(pipe_name), conn))) {
265 DEBUG(3, ("Could not open a connection to %s for %s (%s)\n",
266 domain, pipe_name, nt_errstr(result)));
270 DLIST_ADD(cm_conns, conn);
276 /* Get a connection to the remote DC and open the pipe. If there is already a connection, use that */
278 static NTSTATUS get_connection_from_cache(const char *domain, const char *pipe_name,
279 struct winbindd_cm_conn **conn_out)
281 find_cm_connection(domain, pipe_name, conn_out);
283 if (*conn_out != NULL)
286 return new_cm_connection(domain, pipe_name, conn_out);
289 /**********************************************************************************
290 **********************************************************************************/
292 BOOL cm_check_for_native_mode_win2k( const char *domain )
295 struct winbindd_cm_conn conn;
303 if ( !NT_STATUS_IS_OK(result = cm_open_connection(domain, PI_LSARPC_DS, &conn)) ) {
304 DEBUG(5, ("cm_check_for_native_mode_win2k: Could not open a connection to %s for PIPE_LSARPC (%s)\n",
305 domain, nt_errstr(result)));
310 if ( !NT_STATUS_IS_OK(cli_ds_getprimarydominfo( conn.cli,
311 conn.cli->mem_ctx, DsRolePrimaryDomainInfoBasic, &ctr)) ) {
317 if ( (ctr.basic->flags & DSROLE_PRIMARY_DS_RUNNING)
318 && !(ctr.basic->flags & DSROLE_PRIMARY_DS_MIXED_MODE) )
325 * I don't think we need to shutdown here ? JRA.
328 cli_shutdown( conn.cli );
336 /* Return a LSA policy handle on a domain */
338 NTSTATUS cm_get_lsa_handle(const char *domain, CLI_POLICY_HND **return_hnd)
340 struct winbindd_cm_conn *conn;
341 uint32 des_access = SEC_RIGHTS_MAXIMUM_ALLOWED;
343 static CLI_POLICY_HND hnd;
345 /* Look for existing connections */
347 if (!NT_STATUS_IS_OK(result = get_connection_from_cache(domain, PIPE_LSARPC, &conn)))
350 /* This *shitty* code needs scrapping ! JRA */
352 if (policy_handle_is_valid(&conn->pol)) {
360 result = cli_lsa_open_policy(conn->cli, conn->cli->mem_ctx, False,
361 des_access, &conn->pol);
363 if (!NT_STATUS_IS_OK(result)) {
364 /* Hit the cache code again. This cleans out the old connection and gets a new one */
365 if (conn->cli->fd == -1) { /* Try again, if the remote host disapeared */
366 if (!NT_STATUS_IS_OK(result = get_connection_from_cache(domain, PIPE_LSARPC, &conn)))
369 result = cli_lsa_open_policy(conn->cli, conn->cli->mem_ctx, False,
370 des_access, &conn->pol);
373 if (!NT_STATUS_IS_OK(result)) {
374 cli_shutdown(conn->cli);
375 DLIST_REMOVE(cm_conns, conn);
389 /* Return a SAM policy handle on a domain */
391 NTSTATUS cm_get_sam_handle(char *domain, CLI_POLICY_HND **return_hnd)
393 struct winbindd_cm_conn *conn;
394 uint32 des_access = SEC_RIGHTS_MAXIMUM_ALLOWED;
396 static CLI_POLICY_HND hnd;
398 /* Look for existing connections */
400 if (!NT_STATUS_IS_OK(result = get_connection_from_cache(domain, PIPE_SAMR, &conn)))
403 /* This *shitty* code needs scrapping ! JRA */
405 if (policy_handle_is_valid(&conn->pol)) {
414 result = cli_samr_connect(conn->cli, conn->cli->mem_ctx,
415 des_access, &conn->pol);
417 if (!NT_STATUS_IS_OK(result)) {
418 /* Hit the cache code again. This cleans out the old connection and gets a new one */
419 if (conn->cli->fd == -1) { /* Try again, if the remote host disapeared */
421 if (!NT_STATUS_IS_OK(result = get_connection_from_cache(domain, PIPE_SAMR, &conn)))
424 result = cli_samr_connect(conn->cli, conn->cli->mem_ctx,
425 des_access, &conn->pol);
428 if (!NT_STATUS_IS_OK(result)) {
430 cli_shutdown(conn->cli);
431 DLIST_REMOVE(cm_conns, conn);
446 /* Get a handle on a netlogon pipe. This is a bit of a hack to re-use the
447 netlogon pipe as no handle is returned. */
449 NTSTATUS cm_get_netlogon_cli(const char *domain,
450 const unsigned char *trust_passwd,
451 uint32 sec_channel_type,
453 struct cli_state **cli)
455 NTSTATUS result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
456 struct winbindd_cm_conn *conn;
461 return NT_STATUS_INVALID_PARAMETER;
463 /* Open an initial conection - keep the mutex. */
465 find_cm_connection(domain, PIPE_NETLOGON, &conn);
467 if ( fresh && (conn != NULL) ) {
468 cli_shutdown(conn->cli);
473 /* purge connection from cache */
474 find_cm_connection(domain, PIPE_NETLOGON, &conn);
476 DEBUG(0,("Could not purge connection\n"));
477 return NT_STATUS_UNSUCCESSFUL;
486 result = new_cm_connection(domain, PIPE_NETLOGON, &conn);
488 if (!NT_STATUS_IS_OK(result))
491 snprintf(lock_name, sizeof(lock_name), "NETLOGON\\%s", conn->controller);
493 if (!(got_mutex = secrets_named_mutex(lock_name, WINBIND_SERVER_MUTEX_WAIT_TIME))) {
494 DEBUG(0,("cm_get_netlogon_cli: mutex grab failed for %s\n", conn->controller));
497 if ( sec_channel_type == SEC_CHAN_DOMAIN )
498 snprintf(conn->cli->mach_acct, sizeof(conn->cli->mach_acct) - 1, "%s$", lp_workgroup());
500 result = cli_nt_establish_netlogon(conn->cli, sec_channel_type, trust_passwd);
503 secrets_named_mutex_release(lock_name);
505 if (!NT_STATUS_IS_OK(result)) {
506 cli_shutdown(conn->cli);
507 DLIST_REMOVE(cm_conns, conn);
517 /* Dump the current connection status */
519 static void dump_conn_list(void)
521 struct winbindd_cm_conn *con;
523 DEBUG(0, ("\tDomain Controller Pipe\n"));
525 for(con = cm_conns; con; con = con->next) {
528 /* Display pipe info */
530 if (asprintf(&msg, "\t%-15s %-15s %-16s", con->domain, con->controller, con->pipe_name) < 0) {
531 DEBUG(0, ("Error: not enough memory!\n"));
533 DEBUG(0, ("%s\n", msg));
539 void winbindd_cm_status(void)
541 /* List open connections */
543 DEBUG(0, ("winbindd connection manager status:\n"));
548 DEBUG(0, ("\tNo active connections\n"));
551 /* Close all cached connections */
553 void winbindd_cm_flush(void)
555 struct winbindd_cm_conn *conn, tmp;
557 /* Flush connection cache */
559 for (conn = cm_conns; conn; conn = conn->next) {
561 if (!connection_ok(conn))
564 DEBUG(10, ("Closing connection to %s on %s\n",
565 conn->pipe_name, conn->controller));
568 cli_shutdown(conn->cli);
570 tmp.next = conn->next;
572 DLIST_REMOVE(cm_conns, conn);
577 /* Flush failed connection cache */
579 flush_negative_conn_cache();