source4/ldap_server/ldap_server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    LDAP server
   4    Copyright (C) Volker Lendecke 2004
   5    Copyright (C) Stefan Metzmacher 2004
   6
   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 2 of the License, or
  10    (at your option) any later version.
  11
  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.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 /*
  25   close the socket and shutdown a server_context
  26 */
  27 static void ldapsrv_terminate_connection(struct ldapsrv_connection *ldap_conn, const char *reason)
  28 {
  29         server_terminate_connection(ldap_conn->connection, reason);
  30 }
  31
  32 /*
  33   add a socket address to the list of events, one event per port
  34 */
  35 static void add_socket(struct server_service *service,
  36                        const struct model_ops *model_ops,
  37                        struct in_addr *ifip)
  38 {
  39         struct server_socket *srv_sock;
  40         uint16_t port = 389;
  41         char *ip_str = talloc_strdup(service, inet_ntoa(*ifip));
  42
  43         srv_sock = service_setup_socket(service, model_ops, ip_str, &port);
  44
  45         talloc_free(ip_str);
  46 }
  47
  48 /****************************************************************************
  49  Open the socket communication.
  50 ****************************************************************************/
  51 static void ldapsrv_init(struct server_service *service,
  52                          const struct model_ops *model_ops)
  53 {
  54         DEBUG(1,("ldapsrv_init\n"));
  55
  56         if (lp_interfaces() && lp_bind_interfaces_only()) {
  57                 int num_interfaces = iface_count();
  58                 int i;
  59
  60                 /* We have been given an interfaces line, and been
  61                    told to only bind to those interfaces. Create a
  62                    socket per interface and bind to only these.
  63                 */
  64                 for(i = 0; i < num_interfaces; i++) {
  65                         struct in_addr *ifip = iface_n_ip(i);
  66
  67                         if (ifip == NULL) {
  68                                 DEBUG(0,("ldapsrv_init: interface %d has NULL "
  69                                          "IP address !\n", i));
  70                                 continue;
  71                         }
  72
  73                         add_socket(service, model_ops, ifip);
  74                 }
  75         } else {
  76                 struct in_addr *ifip;
  77                 TALLOC_CTX *mem_ctx = talloc_init("ldapsrv_init");
  78
  79                 if (!mem_ctx) {
  80                         smb_panic("No memory");
  81                 }
  82
  83                 /* Just bind to lp_socket_address() (usually 0.0.0.0) */
  84                 ifip = interpret_addr2(mem_ctx, lp_socket_address());
  85                 add_socket(service, model_ops, ifip);
  86
  87                 talloc_destroy(mem_ctx);
  88         }
  89 }
  90
  91 /* This rw-buf api is made to avoid memcpy. For now do that like mad...  The
  92    idea is to write into a circular list of buffers where the ideal case is
  93    that a read(2) holds a complete request that is then thrown away
  94    completely. */
  95
  96 static void consumed_from_buf(struct rw_buffer *buf,
  97                                    size_t length)
  98 {
  99         memcpy(buf->data, buf->data+length, buf->length-length);
 100         buf->length -= length;
 101 }
 102
 103 static BOOL append_to_buf(struct rw_buffer *buf, uint8_t *data, size_t length)
 104 {
 105         buf->data = realloc(buf->data, buf->length+length);
 106
 107         if (buf->data == NULL)
 108                 return False;
 109
 110         memcpy(buf->data+buf->length, data, length);
 111
 112         buf->length += length;
 113         return True;
 114 }
 115
 116 static BOOL read_into_buf(struct socket_context *sock, struct rw_buffer *buf)
 117 {
 118         NTSTATUS status;
 119         DATA_BLOB tmp_blob;
 120         BOOL ret;
 121
 122         status = socket_recv(sock, sock, &tmp_blob, 1024, 0);
 123         if (!NT_STATUS_IS_OK(status)) {
 124                 DEBUG(1,("socket_recv: %s\n",nt_errstr(status)));
 125                 return False;
 126         }
 127
 128         ret = append_to_buf(buf, tmp_blob.data, tmp_blob.length);
 129
 130         talloc_free(tmp_blob.data);
 131
 132         return ret;
 133 }
 134
 135 static BOOL write_from_buf(struct socket_context *sock, struct rw_buffer *buf)
 136 {
 137         NTSTATUS status;
 138         DATA_BLOB tmp_blob;
 139         size_t sendlen;
 140
 141         tmp_blob.data = buf->data;
 142         tmp_blob.length = buf->length;
 143
 144         status = socket_send(sock, sock, &tmp_blob, &sendlen, 0);
 145         if (!NT_STATUS_IS_OK(status)) {
 146                 DEBUG(0,("socket_send() %s\n",nt_errstr(status)));
 147                 return False;
 148         }
 149
 150         consumed_from_buf(buf, sendlen);
 151
 152         return True;
 153 }
 154
 155 static void peek_into_read_buf(struct rw_buffer *buf, uint8_t **out,
 156                                size_t *out_length)
 157 {
 158         *out = buf->data;
 159         *out_length = buf->length;
 160 }
 161
 162 static BOOL ldap_append_to_buf(struct ldap_message *msg, struct rw_buffer *buf)
 163 {
 164         DATA_BLOB blob;
 165         BOOL res;
 166
 167         if (!ldap_encode(msg, &blob))
 168                 return False;
 169
 170         res = append_to_buf(buf, blob.data, blob.length);
 171
 172         data_blob_free(&blob);
 173         return res;
 174 }
 175
 176 struct ldapsrv_reply *ldapsrv_init_reply(struct ldapsrv_call *call, enum ldap_request_tag type)
 177 {
 178         struct ldapsrv_reply *reply;
 179
 180         reply = talloc_p(call, struct ldapsrv_reply);
 181         if (!reply) {
 182                 return NULL;
 183         }
 184
 185         reply->prev = reply->next = NULL;
 186         reply->state = LDAPSRV_REPLY_STATE_NEW;
 187         reply->msg.messageid = call->request.messageid;
 188         reply->msg.type = type;
 189         reply->msg.mem_ctx = reply;
 190
 191         return reply;
 192 }
 193
 194 NTSTATUS ldapsrv_queue_reply(struct ldapsrv_call *call, struct ldapsrv_reply *reply)
 195 {
 196         DLIST_ADD_END(call->replies, reply, struct ldapsrv_reply *);
 197         return NT_STATUS_OK;
 198 }
 199
 200 struct ldapsrv_partition *ldapsrv_get_partition(struct ldapsrv_connection *conn, const char *dn)
 201 {
 202         static struct ldapsrv_partition null_part;
 203
 204         if (strcasecmp("", dn) == 0) {
 205                 null_part.ops = ldapsrv_get_rootdse_partition_ops();
 206         } else {
 207                 null_part.ops = ldapsrv_get_sldb_partition_ops();
 208         }
 209
 210         return &null_part;
 211 }
 212
 213 NTSTATUS ldapsrv_unwilling(struct ldapsrv_call *call, int error)
 214 {
 215         struct ldapsrv_reply *reply;
 216         struct ldap_ExtendedResponse *r;
 217
 218         DEBUG(0,("Unwilling type[%d] id[%d]\n", call->request.type, call->request.messageid));
 219
 220         reply = ldapsrv_init_reply(call, LDAP_TAG_ExtendedResponse);
 221         if (!reply) {
 222                 return NT_STATUS_NO_MEMORY;
 223         }
 224
 225         r = &reply->msg.r.ExtendedResponse;
 226         r->response.resultcode = error;
 227         r->response.dn = NULL;
 228         r->response.errormessage = NULL;
 229         r->response.referral = NULL;
 230         r->name = NULL;
 231         r->value.data = NULL;
 232         r->value.length = 0;
 233
 234         return ldapsrv_queue_reply(call, reply);
 235 }
 236
 237 static NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
 238 {
 239         struct ldap_BindRequest *req = &call->request.r.BindRequest;
 240         struct ldapsrv_reply *reply;
 241         struct ldap_BindResponse *resp;
 242
 243         DEBUG(5, ("BindRequest dn: %s\n",req->dn));
 244
 245         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 246         if (!reply) {
 247                 return NT_STATUS_NO_MEMORY;
 248         }
 249
 250         resp = &reply->msg.r.BindResponse;
 251         resp->response.resultcode = 0;
 252         resp->response.dn = NULL;
 253         resp->response.errormessage = NULL;
 254         resp->response.referral = NULL;
 255         resp->SASL.secblob = data_blob(NULL, 0);
 256
 257         return ldapsrv_queue_reply(call, reply);
 258 }
 259
 260 static NTSTATUS ldapsrv_UnbindRequest(struct ldapsrv_call *call)
 261 {
 262 /*      struct ldap_UnbindRequest *req = &call->request->r.UnbindRequest;*/
 263         DEBUG(10, ("UnbindRequest\n"));
 264         return NT_STATUS_OK;
 265 }
 266
 267 static NTSTATUS ldapsrv_SearchRequest(struct ldapsrv_call *call)
 268 {
 269         struct ldap_SearchRequest *req = &call->request.r.SearchRequest;
 270         struct ldapsrv_partition *part;
 271
 272         DEBUG(10, ("SearchRequest"));
 273         DEBUGADD(10, (" basedn: %s", req->basedn));
 274         DEBUGADD(10, (" filter: %s\n", req->filter));
 275
 276         part = ldapsrv_get_partition(call->conn, req->basedn);
 277
 278         if (!part->ops->Search) {
 279                 struct ldap_Result *done;
 280                 struct ldapsrv_reply *done_r;
 281
 282                 done_r = ldapsrv_init_reply(call, LDAP_TAG_SearchResultDone);
 283                 if (!done_r) {
 284                         return NT_STATUS_NO_MEMORY;
 285                 }
 286
 287                 done = &done_r->msg.r.SearchResultDone;
 288                 done->resultcode = 53;
 289                 done->dn = NULL;
 290                 done->errormessage = NULL;
 291                 done->referral = NULL;
 292
 293                 return ldapsrv_queue_reply(call, done_r);
 294         }
 295
 296         return part->ops->Search(part, call, req);
 297 }
 298
 299 static NTSTATUS ldapsrv_ModifyRequest(struct ldapsrv_call *call)
 300 {
 301         struct ldap_ModifyRequest *req = &call->request.r.ModifyRequest;
 302         struct ldapsrv_partition *part;
 303
 304         DEBUG(10, ("ModifyRequest"));
 305         DEBUGADD(10, (" dn: %s", req->dn));
 306
 307         part = ldapsrv_get_partition(call->conn, req->dn);
 308
 309         if (!part->ops->Modify) {
 310                 return ldapsrv_unwilling(call, 53);
 311         }
 312
 313         return part->ops->Modify(part, call, req);
 314 }
 315
 316 static NTSTATUS ldapsrv_AddRequest(struct ldapsrv_call *call)
 317 {
 318         struct ldap_AddRequest *req = &call->request.r.AddRequest;
 319         struct ldapsrv_partition *part;
 320
 321         DEBUG(10, ("AddRequest"));
 322         DEBUGADD(10, (" dn: %s", req->dn));
 323
 324         part = ldapsrv_get_partition(call->conn, req->dn);
 325
 326         if (!part->ops->Add) {
 327                 return ldapsrv_unwilling(call, 53);
 328         }
 329
 330         return part->ops->Add(part, call, req);
 331 }
 332
 333 static NTSTATUS ldapsrv_DelRequest(struct ldapsrv_call *call)
 334 {
 335         struct ldap_DelRequest *req = &call->request.r.DelRequest;
 336         struct ldapsrv_partition *part;
 337
 338         DEBUG(10, ("DelRequest"));
 339         DEBUGADD(10, (" dn: %s", req->dn));
 340
 341         part = ldapsrv_get_partition(call->conn, req->dn);
 342
 343         if (!part->ops->Del) {
 344                 return ldapsrv_unwilling(call, 53);
 345         }
 346
 347         return part->ops->Del(part, call, req);
 348 }
 349
 350 static NTSTATUS ldapsrv_ModifyDNRequest(struct ldapsrv_call *call)
 351 {
 352         struct ldap_ModifyDNRequest *req = &call->request.r.ModifyDNRequest;
 353         struct ldapsrv_partition *part;
 354
 355         DEBUG(10, ("ModifyDNRequrest"));
 356         DEBUGADD(10, (" dn: %s", req->dn));
 357         DEBUGADD(10, (" newrdn: %s", req->newrdn));
 358
 359         part = ldapsrv_get_partition(call->conn, req->dn);
 360
 361         if (!part->ops->ModifyDN) {
 362                 return ldapsrv_unwilling(call, 53);
 363         }
 364
 365         return part->ops->ModifyDN(part, call, req);
 366 }
 367
 368 static NTSTATUS ldapsrv_CompareRequest(struct ldapsrv_call *call)
 369 {
 370         struct ldap_CompareRequest *req = &call->request.r.CompareRequest;
 371         struct ldapsrv_partition *part;
 372
 373         DEBUG(10, ("CompareRequest"));
 374         DEBUGADD(10, (" dn: %s", req->dn));
 375
 376         part = ldapsrv_get_partition(call->conn, req->dn);
 377
 378         if (!part->ops->Compare) {
 379                 return ldapsrv_unwilling(call, 53);
 380         }
 381
 382         return part->ops->Compare(part, call, req);
 383 }
 384
 385 static NTSTATUS ldapsrv_AbandonRequest(struct ldapsrv_call *call)
 386 {
 387 /*      struct ldap_AbandonRequest *req = &call->request.r.AbandonRequest;*/
 388         DEBUG(10, ("AbandonRequest\n"));
 389         return NT_STATUS_OK;
 390 }
 391
 392 static NTSTATUS ldapsrv_ExtendedRequest(struct ldapsrv_call *call)
 393 {
 394 /*      struct ldap_ExtendedRequest *req = &call->request.r.ExtendedRequest;*/
 395         struct ldapsrv_reply *reply;
 396
 397         DEBUG(10, ("Extended\n"));
 398
 399         reply = ldapsrv_init_reply(call, LDAP_TAG_ExtendedResponse);
 400         if (!reply) {
 401                 return NT_STATUS_NO_MEMORY;
 402         }
 403
 404         ZERO_STRUCT(reply->msg.r);
 405
 406         return ldapsrv_queue_reply(call, reply);
 407 }
 408
 409 static NTSTATUS ldapsrv_do_call(struct ldapsrv_call *call)
 410 {
 411         switch(call->request.type) {
 412         case LDAP_TAG_BindRequest:
 413                 return ldapsrv_BindRequest(call);
 414         case LDAP_TAG_UnbindRequest:
 415                 return ldapsrv_UnbindRequest(call);
 416         case LDAP_TAG_SearchRequest:
 417                 return ldapsrv_SearchRequest(call);
 418         case LDAP_TAG_ModifyRequest:
 419                 return ldapsrv_ModifyRequest(call);
 420         case LDAP_TAG_AddRequest:
 421                 return ldapsrv_AddRequest(call);
 422         case LDAP_TAG_DelRequest:
 423                 return ldapsrv_DelRequest(call);
 424         case LDAP_TAG_ModifyDNRequest:
 425                 return ldapsrv_ModifyDNRequest(call);
 426         case LDAP_TAG_CompareRequest:
 427                 return ldapsrv_CompareRequest(call);
 428         case LDAP_TAG_AbandonRequest:
 429                 return ldapsrv_AbandonRequest(call);
 430         case LDAP_TAG_ExtendedRequest:
 431                 return ldapsrv_ExtendedRequest(call);
 432         default:
 433                 return ldapsrv_unwilling(call, 2);
 434         }
 435 }
 436
 437 static NTSTATUS ldapsrv_do_responses(struct ldapsrv_connection *conn)
 438 {
 439         struct ldapsrv_call *call, *next_call = NULL;
 440         struct ldapsrv_reply *reply, *next_reply = NULL;
 441
 442         for (call=conn->calls; call; call=next_call) {
 443                 for (reply=call->replies; reply; reply=next_reply) {
 444                         if (!ldap_append_to_buf(&reply->msg, &conn->out_buffer)) {
 445                                 return NT_STATUS_FOOBAR;
 446                         }
 447                         next_reply = reply->next;
 448                         DLIST_REMOVE(call->replies, reply);
 449                         reply->state = LDAPSRV_REPLY_STATE_SEND;
 450                         talloc_free(reply);
 451                 }
 452                 next_call = call->next;
 453                 DLIST_REMOVE(conn->calls, call);
 454                 call->state = LDAPSRV_CALL_STATE_COMPLETE;
 455                 talloc_free(call);
 456         }
 457
 458         return NT_STATUS_OK;
 459 }
 460
 461 /*
 462   called when a LDAP socket becomes readable
 463 */
 464 static void ldapsrv_recv(struct server_connection *conn, time_t t,
 465                          uint16_t flags)
 466 {
 467         struct ldapsrv_connection *ldap_conn = conn->private_data;
 468         uint8_t *buf;
 469         int buf_length, msg_length;
 470         DATA_BLOB blob;
 471         ASN1_DATA data;
 472         struct ldapsrv_call *call;
 473         NTSTATUS status;
 474
 475         DEBUG(10,("ldapsrv_recv\n"));
 476
 477         if (!read_into_buf(conn->socket, &ldap_conn->in_buffer)) {
 478                 ldapsrv_terminate_connection(ldap_conn, "read_into_buf() failed");
 479                 return;
 480         }
 481
 482         peek_into_read_buf(&ldap_conn->in_buffer, &buf, &buf_length);
 483
 484         while (buf_length > 0) {
 485
 486                 peek_into_read_buf(&ldap_conn->in_buffer, &buf, &buf_length);
 487                 /* LDAP Messages are always SEQUENCES */
 488
 489                 if (!asn1_object_length(buf, buf_length, ASN1_SEQUENCE(0),
 490                                         &msg_length)) {
 491                         ldapsrv_terminate_connection(ldap_conn, "asn1_object_length() failed");
 492                         return;
 493                 }
 494
 495                 if (buf_length < msg_length) {
 496                         /* Not enough yet */
 497                         break;
 498                 }
 499
 500                 /* We've got a complete LDAP request in the in-buffer, convert
 501                  * that to a ldap_message and put it into the incoming
 502                  * queue. */
 503
 504                 blob.data = buf;
 505                 blob.length = msg_length;
 506
 507                 if (!asn1_load(&data, blob)) {
 508                         ldapsrv_terminate_connection(ldap_conn, "asn1_load() failed");
 509                         return;
 510                 }
 511
 512                 call = talloc_p(ldap_conn, struct ldapsrv_call);
 513                 if (!call) {
 514                         ldapsrv_terminate_connection(ldap_conn, "no memory");
 515                         return;
 516                 }
 517
 518                 ZERO_STRUCTP(call);
 519                 call->state = LDAPSRV_CALL_STATE_NEW;
 520                 call->conn = ldap_conn;
 521                 /* TODO: we should use talloc_reference() here */
 522                 call->session_info = ldap_conn->session_info;
 523                 call->request.mem_ctx = call;
 524
 525                 if (!ldap_decode(&data, &call->request)) {
 526                         dump_data(0,buf, msg_length);
 527                         ldapsrv_terminate_connection(ldap_conn, "ldap_decode() failed");
 528                         return;
 529                 }
 530
 531                 DLIST_ADD_END(ldap_conn->calls, call,
 532                               struct ldapsrv_call *);
 533
 534                 consumed_from_buf(&ldap_conn->in_buffer, msg_length);
 535
 536                 status = ldapsrv_do_call(call);
 537                 if (!NT_STATUS_IS_OK(status)) {
 538                         ldapsrv_terminate_connection(ldap_conn, "ldapsrv_do_call() failed");
 539                         return;
 540                 }
 541
 542                 peek_into_read_buf(&ldap_conn->in_buffer, &buf, &buf_length);
 543         }
 544
 545         status = ldapsrv_do_responses(ldap_conn);
 546         if (!NT_STATUS_IS_OK(status)) {
 547                 ldapsrv_terminate_connection(ldap_conn, "ldapsrv_do_responses() failed");
 548                 return;
 549         }
 550
 551         if (ldap_conn->out_buffer.length > 0) {
 552                 conn->event.fde->flags |= EVENT_FD_WRITE;
 553         }
 554
 555         return;
 556 }
 557
 558 /*
 559   called when a LDAP socket becomes writable
 560 */
 561 static void ldapsrv_send(struct server_connection *conn, time_t t,
 562                          uint16_t flags)
 563 {
 564         struct ldapsrv_connection *ldap_conn = conn->private_data;
 565
 566         DEBUG(10,("ldapsrv_send\n"));
 567
 568         if (!write_from_buf(conn->socket, &ldap_conn->out_buffer)) {
 569                 ldapsrv_terminate_connection(ldap_conn, "write_from_buf() failed");
 570                 return;
 571         }
 572
 573         if (ldap_conn->out_buffer.length == 0) {
 574                 conn->event.fde->flags &= ~EVENT_FD_WRITE;
 575         }
 576
 577         return;
 578 }
 579
 580 /*
 581   called when connection is idle
 582 */
 583 static void ldapsrv_idle(struct server_connection *conn, time_t t)
 584 {
 585         DEBUG(10,("ldapsrv_idle: not implemented!\n"));
 586         return;
 587 }
 588
 589 static void ldapsrv_close(struct server_connection *conn, const char *reason)
 590 {
 591         return;
 592 }
 593
 594 /*
 595   initialise a server_context from a open socket and register a event handler
 596   for reading from that socket
 597 */
 598 static void ldapsrv_accept(struct server_connection *conn)
 599 {
 600         struct ldapsrv_connection *ldap_conn;
 601
 602         DEBUG(5, ("ldapsrv_accept\n"));
 603
 604         ldap_conn = talloc_p(conn, struct ldapsrv_connection);
 605
 606         if (ldap_conn == NULL)
 607                 return;
 608
 609         ZERO_STRUCTP(ldap_conn);
 610         ldap_conn->connection = conn;
 611
 612         conn->private_data = ldap_conn;
 613
 614         return;
 615 }
 616
 617 /*
 618   called on a fatal error that should cause this server to terminate
 619 */
 620 static void ldapsrv_exit(struct server_service *service, const char *reason)
 621 {
 622         DEBUG(1,("ldapsrv_exit\n"));
 623         return;
 624 }
 625
 626 static const struct server_service_ops ldap_server_ops = {
 627         .name                   = "ldap",
 628         .service_init           = ldapsrv_init,
 629         .accept_connection      = ldapsrv_accept,
 630         .recv_handler           = ldapsrv_recv,
 631         .send_handler           = ldapsrv_send,
 632         .idle_handler           = ldapsrv_idle,
 633         .close_connection       = ldapsrv_close,
 634         .service_exit           = ldapsrv_exit,
 635 };
 636
 637 const struct server_service_ops *ldapsrv_get_ops(void)
 638 {
 639         return &ldap_server_ops;
 640 }
 641
 642 NTSTATUS server_service_ldap_init(void)
 643 {
 644         return NT_STATUS_OK;
 645 }