Fix some nonempty blank lines
[ira/wip.git] / source4 / ldap_server / ldap_server.c
1 /* 
2    Unix SMB/CIFS implementation.
3
4    LDAP server
5
6    Copyright (C) Andrew Tridgell 2005
7    Copyright (C) Volker Lendecke 2004
8    Copyright (C) Stefan Metzmacher 2004
9
10    This program is free software; you can redistribute it and/or modify
11    it under the terms of the GNU General Public License as published by
12    the Free Software Foundation; either version 3 of the License, or
13    (at your option) any later version.
14
15    This program is distributed in the hope that it will be useful,
16    but WITHOUT ANY WARRANTY; without even the implied warranty of
17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18    GNU General Public License for more details.
19
20    You should have received a copy of the GNU General Public License
21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
22 */
23
24 #include "includes.h"
25 #include "lib/events/events.h"
26 #include "auth/auth.h"
27 #include "auth/credentials/credentials.h"
28 #include "librpc/gen_ndr/ndr_samr.h"
29 #include "../lib/util/dlinklist.h"
30 #include "../lib/util/asn1.h"
31 #include "ldap_server/ldap_server.h"
32 #include "smbd/service_task.h"
33 #include "smbd/service_stream.h"
34 #include "smbd/service.h"
35 #include "smbd/process_model.h"
36 #include "lib/tls/tls.h"
37 #include "lib/messaging/irpc.h"
38 #include "lib/ldb/include/ldb.h"
39 #include "lib/ldb/include/ldb_errors.h"
40 #include "libcli/ldap/ldap.h"
41 #include "libcli/ldap/ldap_proto.h"
42 #include "system/network.h"
43 #include "lib/socket/netif.h"
44 #include "dsdb/samdb/samdb.h"
45 #include "param/param.h"
46 /*
47   close the socket and shutdown a server_context
48 */
49 void ldapsrv_terminate_connection(struct ldapsrv_connection *conn, 
50                                          const char *reason)
51 {
52         stream_terminate_connection(conn->connection, reason);
53 }
54
55 /*
56   handle packet errors
57 */
58 static void ldapsrv_error_handler(void *private_data, NTSTATUS status)
59 {
60         struct ldapsrv_connection *conn = talloc_get_type(private_data,
61                                                           struct ldapsrv_connection);
62         ldapsrv_terminate_connection(conn, nt_errstr(status));
63 }
64
65 /*
66   process a decoded ldap message
67 */
68 static void ldapsrv_process_message(struct ldapsrv_connection *conn,
69                                     struct ldap_message *msg)
70 {
71         struct ldapsrv_call *call;
72         NTSTATUS status;
73         DATA_BLOB blob;
74
75         call = talloc(conn, struct ldapsrv_call);
76         if (!call) {
77                 ldapsrv_terminate_connection(conn, "no memory");
78                 return;         
79         }
80
81         call->request = talloc_steal(call, msg);
82         call->conn = conn;
83         call->replies = NULL;
84         call->send_callback = NULL;
85         call->send_private = NULL;
86
87         /* make the call */
88         status = ldapsrv_do_call(call);
89         if (!NT_STATUS_IS_OK(status)) {
90                 talloc_free(call);
91                 return;
92         }
93
94         blob = data_blob(NULL, 0);
95
96         if (call->replies == NULL) {
97                 talloc_free(call);
98                 return;
99         }
100
101         /* build all the replies into a single blob */
102         while (call->replies) {
103                 DATA_BLOB b;
104                 bool ret;
105
106                 msg = call->replies->msg;
107                 if (!ldap_encode(msg, samba_ldap_control_handlers(), &b, call)) {
108                         DEBUG(0,("Failed to encode ldap reply of type %d\n", msg->type));
109                         talloc_free(call);
110                         return;
111                 }
112
113                 ret = data_blob_append(call, &blob, b.data, b.length);
114                 data_blob_free(&b);
115
116                 talloc_set_name_const(blob.data, "Outgoing, encoded LDAP packet");
117
118                 if (!ret) {
119                         talloc_free(call);
120                         return;
121                 }
122
123                 DLIST_REMOVE(call->replies, call->replies);
124         }
125
126         packet_send_callback(conn->packet, blob, 
127                              call->send_callback, call->send_private);
128         talloc_free(call);
129         return;
130 }
131
132 /*
133   decode/process data
134 */
135 static NTSTATUS ldapsrv_decode(void *private_data, DATA_BLOB blob)
136 {
137         NTSTATUS status;
138         struct ldapsrv_connection *conn = talloc_get_type(private_data,
139                                                           struct ldapsrv_connection);
140         struct asn1_data *asn1 = asn1_init(conn);
141         struct ldap_message *msg = talloc(conn, struct ldap_message);
142
143         if (asn1 == NULL || msg == NULL) {
144                 return NT_STATUS_NO_MEMORY;
145         }
146
147         if (!asn1_load(asn1, blob)) {
148                 talloc_free(msg);
149                 talloc_free(asn1);
150                 return NT_STATUS_NO_MEMORY;
151         }
152
153         status = ldap_decode(asn1, samba_ldap_control_handlers(), msg);
154         if (!NT_STATUS_IS_OK(status)) {
155                 asn1_free(asn1);
156                 return status;
157         }
158
159         data_blob_free(&blob);
160         talloc_steal(conn, msg);
161         asn1_free(asn1);
162
163         ldapsrv_process_message(conn, msg);
164         return NT_STATUS_OK;
165 }
166
167 /*
168  Idle timeout handler
169 */
170 static void ldapsrv_conn_idle_timeout(struct tevent_context *ev,
171                                       struct tevent_timer *te,
172                                       struct timeval t,
173                                       void *private_data)
174 {
175         struct ldapsrv_connection *conn = talloc_get_type(private_data, struct ldapsrv_connection);
176
177         ldapsrv_terminate_connection(conn, "Timeout. No requests after bind");
178 }
179
180 /*
181   called when a LDAP socket becomes readable
182 */
183 void ldapsrv_recv(struct stream_connection *c, uint16_t flags)
184 {
185         struct ldapsrv_connection *conn = 
186                 talloc_get_type(c->private_data, struct ldapsrv_connection);
187
188         if (conn->limits.ite) { /* clean initial timeout if any */
189                 talloc_free(conn->limits.ite);
190                 conn->limits.ite = NULL;
191         }
192
193         if (conn->limits.te) { /* clean idle timeout if any */
194                 talloc_free(conn->limits.te);
195                 conn->limits.te = NULL;
196         }
197
198         packet_recv(conn->packet);
199
200         /* set idle timeout */
201         conn->limits.te = event_add_timed(c->event.ctx, conn, 
202                                            timeval_current_ofs(conn->limits.conn_idle_time, 0),
203                                            ldapsrv_conn_idle_timeout, conn);
204 }
205
206 /*
207   called when a LDAP socket becomes writable
208 */
209 static void ldapsrv_send(struct stream_connection *c, uint16_t flags)
210 {
211         struct ldapsrv_connection *conn = 
212                 talloc_get_type(c->private_data, struct ldapsrv_connection);
213
214         packet_queue_run(conn->packet);
215 }
216
217 static void ldapsrv_conn_init_timeout(struct tevent_context *ev,
218                                       struct tevent_timer *te,
219                                       struct timeval t,
220                                       void *private_data)
221 {
222         struct ldapsrv_connection *conn = talloc_get_type(private_data, struct ldapsrv_connection);
223
224         ldapsrv_terminate_connection(conn, "Timeout. No requests after initial connection");
225 }
226
227 static int ldapsrv_load_limits(struct ldapsrv_connection *conn)
228 {
229         TALLOC_CTX *tmp_ctx;
230         const char *attrs[] = { "configurationNamingContext", NULL };
231         const char *attrs2[] = { "lDAPAdminLimits", NULL };
232         struct ldb_message_element *el;
233         struct ldb_result *res = NULL;
234         struct ldb_dn *basedn;
235         struct ldb_dn *conf_dn;
236         struct ldb_dn *policy_dn;
237         int i,ret;
238
239         /* set defaults limits in case of failure */
240         conn->limits.initial_timeout = 120;
241         conn->limits.conn_idle_time = 900;
242         conn->limits.max_page_size = 1000;
243         conn->limits.search_timeout = 120;
244
245
246         tmp_ctx = talloc_new(conn);
247         if (tmp_ctx == NULL) {
248                 return -1;
249         }
250
251         basedn = ldb_dn_new(tmp_ctx, conn->ldb, NULL);
252         if ( ! ldb_dn_validate(basedn)) {
253                 goto failed;
254         }
255
256         ret = ldb_search(conn->ldb, tmp_ctx, &res, basedn, LDB_SCOPE_BASE, attrs, NULL);
257         if (ret != LDB_SUCCESS) {
258                 goto failed;
259         }
260
261         if (res->count != 1) {
262                 goto failed;
263         }
264
265         conf_dn = ldb_msg_find_attr_as_dn(conn->ldb, tmp_ctx, res->msgs[0], "configurationNamingContext");
266         if (conf_dn == NULL) {
267                 goto failed;
268         }
269
270         policy_dn = ldb_dn_copy(tmp_ctx, conf_dn);
271         ldb_dn_add_child_fmt(policy_dn, "CN=Default Query Policy,CN=Query-Policies,CN=Directory Service,CN=Windows NT,CN=Services");
272         if (policy_dn == NULL) {
273                 goto failed;
274         }
275
276         ret = ldb_search(conn->ldb, tmp_ctx, &res, policy_dn, LDB_SCOPE_BASE, attrs2, NULL);
277         if (ret != LDB_SUCCESS) {
278                 goto failed;
279         }
280
281         if (res->count != 1) {
282                 goto failed;
283         }
284
285         el = ldb_msg_find_element(res->msgs[0], "lDAPAdminLimits");
286         if (el == NULL) {
287                 goto failed;
288         }
289
290         for (i = 0; i < el->num_values; i++) {
291                 char policy_name[256];
292                 int policy_value, s;
293
294                 s = sscanf((const char *)el->values[i].data, "%255[^=]=%d", policy_name, &policy_value);
295                 if (ret != 2 || policy_value == 0)
296                         continue;
297
298                 if (strcasecmp("InitRecvTimeout", policy_name) == 0) {
299                         conn->limits.initial_timeout = policy_value;
300                         continue;
301                 }
302                 if (strcasecmp("MaxConnIdleTime", policy_name) == 0) {
303                         conn->limits.conn_idle_time = policy_value;
304                         continue;
305                 }
306                 if (strcasecmp("MaxPageSize", policy_name) == 0) {
307                         conn->limits.max_page_size = policy_value;
308                         continue;
309                 }
310                 if (strcasecmp("MaxQueryDuration", policy_name) == 0) {
311                         conn->limits.search_timeout = policy_value;
312                         continue;
313                 }
314         }
315
316         return 0;
317
318 failed:
319         DEBUG(0, ("Failed to load ldap server query policies\n"));
320         talloc_free(tmp_ctx);
321         return -1;
322 }
323
324 /*
325   initialise a server_context from a open socket and register a event handler
326   for reading from that socket
327 */
328 static void ldapsrv_accept(struct stream_connection *c)
329 {
330         struct ldapsrv_service *ldapsrv_service = 
331                 talloc_get_type(c->private_data, struct ldapsrv_service);
332         struct ldapsrv_connection *conn;
333         struct cli_credentials *server_credentials;
334         struct socket_address *socket_address;
335         NTSTATUS status;
336         int port;
337
338         conn = talloc_zero(c, struct ldapsrv_connection);
339         if (!conn) {
340                 stream_terminate_connection(c, "ldapsrv_accept: out of memory");
341                 return;
342         }
343
344         conn->packet      = NULL;
345         conn->connection  = c;
346         conn->service     = ldapsrv_service;
347         conn->sockets.raw = c->socket;
348         conn->lp_ctx      = ldapsrv_service->task->lp_ctx;
349
350         c->private_data   = conn;
351
352         socket_address = socket_get_my_addr(c->socket, conn);
353         if (!socket_address) {
354                 ldapsrv_terminate_connection(conn, "ldapsrv_accept: failed to obtain local socket address!");
355                 return;
356         }
357         port = socket_address->port;
358         talloc_free(socket_address);
359
360         if (port == 636) {
361                 struct socket_context *tls_socket = tls_init_server(ldapsrv_service->tls_params, c->socket, 
362                                                                     c->event.fde, NULL);
363                 if (!tls_socket) {
364                         ldapsrv_terminate_connection(conn, "ldapsrv_accept: tls_init_server() failed");
365                         return;
366                 }
367                 talloc_unlink(c, c->socket);
368                 talloc_steal(c, tls_socket);
369                 c->socket = tls_socket;
370                 conn->sockets.tls = tls_socket;
371
372         } else if (port == 3268) /* Global catalog */ {
373                 conn->global_catalog = true;
374         }
375         conn->packet = packet_init(conn);
376         if (conn->packet == NULL) {
377                 ldapsrv_terminate_connection(conn, "out of memory");
378                 return;
379         }
380
381         packet_set_private(conn->packet, conn);
382         packet_set_socket(conn->packet, c->socket);
383         packet_set_callback(conn->packet, ldapsrv_decode);
384         packet_set_full_request(conn->packet, ldap_full_packet);
385         packet_set_error_handler(conn->packet, ldapsrv_error_handler);
386         packet_set_event_context(conn->packet, c->event.ctx);
387         packet_set_fde(conn->packet, c->event.fde);
388         packet_set_serialise(conn->packet);
389
390         if (conn->sockets.tls) {
391                 packet_set_unreliable_select(conn->packet);
392         }
393
394         /* Ensure we don't get packets until the database is ready below */
395         packet_recv_disable(conn->packet);
396
397         server_credentials = cli_credentials_init(conn);
398         if (!server_credentials) {
399                 stream_terminate_connection(c, "Failed to init server credentials\n");
400                 return;
401         }
402
403         cli_credentials_set_conf(server_credentials, conn->lp_ctx);
404         status = cli_credentials_set_machine_account(server_credentials, conn->lp_ctx);
405         if (!NT_STATUS_IS_OK(status)) {
406                 stream_terminate_connection(c, talloc_asprintf(conn, "Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status)));
407                 return;
408         }
409         conn->server_credentials = server_credentials;
410
411         /* Connections start out anonymous */
412         if (!NT_STATUS_IS_OK(auth_anonymous_session_info(conn, c->event.ctx, conn->lp_ctx, &conn->session_info))) {
413                 ldapsrv_terminate_connection(conn, "failed to setup anonymous session info");
414                 return;
415         }
416
417         if (!NT_STATUS_IS_OK(ldapsrv_backend_Init(conn))) {
418                 ldapsrv_terminate_connection(conn, "backend Init failed");
419                 return;
420         }
421
422         /* load limits from the conf partition */
423         ldapsrv_load_limits(conn); /* should we fail on error ? */
424
425         /* register the server */       
426         irpc_add_name(c->msg_ctx, "ldap_server");
427
428         /* set connections limits */
429         conn->limits.ite = event_add_timed(c->event.ctx, conn, 
430                                            timeval_current_ofs(conn->limits.initial_timeout, 0),
431                                            ldapsrv_conn_init_timeout, conn);
432
433         packet_recv_enable(conn->packet);
434
435 }
436
437 static const struct stream_server_ops ldap_stream_ops = {
438         .name                   = "ldap",
439         .accept_connection      = ldapsrv_accept,
440         .recv_handler           = ldapsrv_recv,
441         .send_handler           = ldapsrv_send,
442 };
443
444 /*
445   add a socket address to the list of events, one event per port
446 */
447 static NTSTATUS add_socket(struct tevent_context *event_context,
448                            struct loadparm_context *lp_ctx, 
449                            const struct model_ops *model_ops,
450                            const char *address, struct ldapsrv_service *ldap_service)
451 {
452         uint16_t port = 389;
453         NTSTATUS status;
454         struct ldb_context *ldb;
455
456         status = stream_setup_socket(event_context, lp_ctx,
457                                      model_ops, &ldap_stream_ops, 
458                                      "ipv4", address, &port, 
459                                      lp_socket_options(lp_ctx), 
460                                      ldap_service);
461         if (!NT_STATUS_IS_OK(status)) {
462                 DEBUG(0,("ldapsrv failed to bind to %s:%u - %s\n",
463                          address, port, nt_errstr(status)));
464         }
465
466         if (tls_support(ldap_service->tls_params)) {
467                 /* add ldaps server */
468                 port = 636;
469                 status = stream_setup_socket(event_context, lp_ctx, 
470                                              model_ops, &ldap_stream_ops, 
471                                              "ipv4", address, &port, 
472                                              lp_socket_options(lp_ctx), 
473                                              ldap_service);
474                 if (!NT_STATUS_IS_OK(status)) {
475                         DEBUG(0,("ldapsrv failed to bind to %s:%u - %s\n",
476                                  address, port, nt_errstr(status)));
477                 }
478         }
479
480         /* Load LDAP database, but only to read our settings */
481         ldb = samdb_connect(ldap_service, ldap_service->task->event_ctx, 
482                             lp_ctx, system_session(ldap_service, lp_ctx));
483         if (!ldb) {
484                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
485         }
486
487         if (samdb_is_gc(ldb)) {
488                 port = 3268;
489                 status = stream_setup_socket(event_context, lp_ctx,
490                                              model_ops, &ldap_stream_ops, 
491                                              "ipv4", address, &port, 
492                                              lp_socket_options(lp_ctx), 
493                                              ldap_service);
494                 if (!NT_STATUS_IS_OK(status)) {
495                         DEBUG(0,("ldapsrv failed to bind to %s:%u - %s\n",
496                                  address, port, nt_errstr(status)));
497                 }
498         }
499
500         /* And once we are bound, free the tempoary ldb, it will
501          * connect again on each incoming LDAP connection */
502         talloc_free(ldb);
503
504         return status;
505 }
506
507 /*
508   open the ldap server sockets
509 */
510 static void ldapsrv_task_init(struct task_server *task)
511 {       
512         char *ldapi_path;
513         struct ldapsrv_service *ldap_service;
514         NTSTATUS status;
515         const struct model_ops *model_ops;
516
517         switch (lp_server_role(task->lp_ctx)) {
518         case ROLE_STANDALONE:
519                 task_server_terminate(task, "ldap_server: no LDAP server required in standalone configuration");
520                 return;
521         case ROLE_DOMAIN_MEMBER:
522                 task_server_terminate(task, "ldap_server: no LDAP server required in member server configuration");
523                 return;
524         case ROLE_DOMAIN_CONTROLLER:
525                 /* Yes, we want an LDAP server */
526                 break;
527         }
528
529         task_server_set_title(task, "task[ldapsrv]");
530
531         /* run the ldap server as a single process */
532         model_ops = process_model_startup(task->event_ctx, "single");
533         if (!model_ops) goto failed;
534
535         ldap_service = talloc_zero(task, struct ldapsrv_service);
536         if (ldap_service == NULL) goto failed;
537
538         ldap_service->task = task;
539
540         ldap_service->tls_params = tls_initialise(ldap_service, task->lp_ctx);
541         if (ldap_service->tls_params == NULL) goto failed;
542
543         if (lp_interfaces(task->lp_ctx) && lp_bind_interfaces_only(task->lp_ctx)) {
544                 struct interface *ifaces;
545                 int num_interfaces;
546                 int i;
547
548                 load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
549                 num_interfaces = iface_count(ifaces);
550
551                 /* We have been given an interfaces line, and been 
552                    told to only bind to those interfaces. Create a
553                    socket per interface and bind to only these.
554                 */
555                 for(i = 0; i < num_interfaces; i++) {
556                         const char *address = iface_n_ip(ifaces, i);
557                         status = add_socket(task->event_ctx, task->lp_ctx, model_ops, address, ldap_service);
558                         if (!NT_STATUS_IS_OK(status)) goto failed;
559                 }
560         } else {
561                 status = add_socket(task->event_ctx, task->lp_ctx, model_ops, 
562                                     lp_socket_address(task->lp_ctx), ldap_service);
563                 if (!NT_STATUS_IS_OK(status)) goto failed;
564         }
565
566         ldapi_path = private_path(ldap_service, task->lp_ctx, "ldapi");
567         if (!ldapi_path) {
568                 goto failed;
569         }
570
571         status = stream_setup_socket(task->event_ctx, task->lp_ctx,
572                                      model_ops, &ldap_stream_ops, 
573                                      "unix", ldapi_path, NULL, 
574                                      lp_socket_options(task->lp_ctx), 
575                                      ldap_service);
576         talloc_free(ldapi_path);
577         if (!NT_STATUS_IS_OK(status)) {
578                 DEBUG(0,("ldapsrv failed to bind to %s - %s\n",
579                          ldapi_path, nt_errstr(status)));
580         }
581
582         return;
583
584 failed:
585         task_server_terminate(task, "Failed to startup ldap server task");      
586 }
587
588
589 NTSTATUS server_service_ldap_init(void)
590 {
591         return register_server_service("ldap", ldapsrv_task_init);
592 }