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 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(0,("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 void ldapsrv_queue_reply(struct ldapsrv_call *call, struct ldapsrv_reply *reply)
 195 {
 196         DLIST_ADD_END(call->replies, reply, struct ldapsrv_reply *);
 197 }
 198
 199 struct ldapsrv_partition *ldapsrv_get_partition(struct ldapsrv_connection *conn, const char *dn)
 200 {
 201         static struct ldapsrv_partition null_part;
 202
 203         null_part.ops = ldapsrv_get_sldb_partition_ops();
 204
 205         return &null_part;
 206 }
 207
 208 void ldapsrv_unwilling(struct ldapsrv_call *call, int error)
 209 {
 210         struct ldapsrv_reply *reply;
 211         struct ldap_ExtendedResponse *r;
 212
 213         DEBUG(0,("Unwilling type[%d] id[%d]\n", call->request.type, call->request.messageid));
 214
 215         reply = ldapsrv_init_reply(call, LDAP_TAG_ExtendedResponse);
 216         if (!reply) {
 217                 ldapsrv_terminate_connection(call->conn, "ldapsrv_init_reply() failed");
 218                 return;
 219         }
 220
 221         r = &reply->msg.r.ExtendedResponse;
 222         r->response.resultcode = error;
 223         r->response.dn = NULL;
 224         r->response.errormessage = NULL;
 225         r->response.referral = NULL;
 226         r->name = NULL;
 227         r->value.data = NULL;
 228         r->value.length = 0;
 229
 230         ldapsrv_queue_reply(call, reply);
 231 }
 232
 233 static void ldapsrv_BindRequest(struct ldapsrv_call *call)
 234 {
 235         struct ldap_BindRequest *req = &call->request.r.BindRequest;
 236         struct ldapsrv_reply *reply;
 237         struct ldap_BindResponse *resp;
 238
 239         DEBUG(5, ("BindRequest dn: %s\n",req->dn));
 240
 241         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 242         if (!reply) {
 243                 ldapsrv_terminate_connection(call->conn, "ldapsrv_init_reply() failed");
 244                 return;
 245         }
 246
 247         resp = &reply->msg.r.BindResponse;
 248         resp->response.resultcode = 0;
 249         resp->response.dn = NULL;
 250         resp->response.errormessage = NULL;
 251         resp->response.referral = NULL;
 252         resp->SASL.secblob = data_blob(NULL, 0);
 253
 254         ldapsrv_queue_reply(call, reply);
 255 }
 256
 257 static void ldapsrv_UnbindRequest(struct ldapsrv_call *call)
 258 {
 259 /*      struct ldap_UnbindRequest *req = &call->request->r.UnbindRequest;*/
 260         DEBUG(10, ("UnbindRequest\n"));
 261 }
 262
 263 static void ldapsrv_SearchRequest(struct ldapsrv_call *call)
 264 {
 265         struct ldap_SearchRequest *req = &call->request.r.SearchRequest;
 266         struct ldapsrv_partition *part;
 267
 268         DEBUG(10, ("SearchRequest"));
 269         DEBUGADD(10, (" basedn: %s", req->basedn));
 270         DEBUGADD(10, (" filter: %s\n", req->filter));
 271
 272         if (strcasecmp("", req->basedn) == 0) {
 273                 ldapsrv_RootDSE_Search(call, req);
 274                 return;
 275         }
 276
 277         part = ldapsrv_get_partition(call->conn, req->basedn);
 278
 279         if (!part->ops->Search) {
 280                 struct ldap_Result *done;
 281                 struct ldapsrv_reply *done_r;
 282
 283                 done_r = ldapsrv_init_reply(call, LDAP_TAG_SearchResultDone);
 284                 if (!done_r) {
 285                         ldapsrv_terminate_connection(call->conn, "ldapsrv_init_reply() failed");
 286                         return;
 287                 }
 288
 289                 done = &done_r->msg.r.SearchResultDone;
 290                 done->resultcode = 53;
 291                 done->dn = NULL;
 292                 done->errormessage = NULL;
 293                 done->referral = NULL;
 294
 295                 ldapsrv_queue_reply(call, done_r);
 296                 return;
 297         }
 298
 299         part->ops->Search(part, call, req);
 300 }
 301
 302 static void ldapsrv_ModifyRequest(struct ldapsrv_call *call)
 303 {
 304         struct ldap_ModifyRequest *req = &call->request.r.ModifyRequest;
 305         struct ldapsrv_partition *part;
 306
 307         DEBUG(10, ("ModifyRequest"));
 308         DEBUGADD(10, (" dn: %s", req->dn));
 309
 310         part = ldapsrv_get_partition(call->conn, req->dn);
 311
 312         if (!part->ops->Modify) {
 313                 ldapsrv_unwilling(call, 53);
 314                 return;
 315         }
 316
 317         part->ops->Modify(part, call, req);
 318 }
 319
 320 static void ldapsrv_AddRequest(struct ldapsrv_call *call)
 321 {
 322         struct ldap_AddRequest *req = &call->request.r.AddRequest;
 323         struct ldapsrv_partition *part;
 324
 325         DEBUG(10, ("AddRequest"));
 326         DEBUGADD(10, (" dn: %s", req->dn));
 327
 328         part = ldapsrv_get_partition(call->conn, req->dn);
 329
 330         if (!part->ops->Add) {
 331                 ldapsrv_unwilling(call, 53);
 332                 return;
 333         }
 334
 335         part->ops->Add(part, call, req);
 336 }
 337
 338 static void ldapsrv_DelRequest(struct ldapsrv_call *call)
 339 {
 340         struct ldap_DelRequest *req = &call->request.r.DelRequest;
 341         struct ldapsrv_partition *part;
 342
 343         DEBUG(10, ("DelRequest"));
 344         DEBUGADD(10, (" dn: %s", req->dn));
 345
 346         part = ldapsrv_get_partition(call->conn, req->dn);
 347
 348         if (!part->ops->Del) {
 349                 ldapsrv_unwilling(call, 53);
 350                 return;
 351         }
 352
 353         part->ops->Del(part, call, req);
 354 }
 355
 356 static void ldapsrv_ModifyDNRequest(struct ldapsrv_call *call)
 357 {
 358         struct ldap_ModifyDNRequest *req = &call->request.r.ModifyDNRequest;
 359         struct ldapsrv_partition *part;
 360
 361         DEBUG(10, ("ModifyDNRequrest"));
 362         DEBUGADD(10, (" dn: %s", req->dn));
 363         DEBUGADD(10, (" newrdn: %s", req->newrdn));
 364
 365         part = ldapsrv_get_partition(call->conn, req->dn);
 366
 367         if (!part->ops->ModifyDN) {
 368                 ldapsrv_unwilling(call, 53);
 369                 return;
 370         }
 371
 372         part->ops->ModifyDN(part, call, req);
 373 }
 374
 375 static void ldapsrv_CompareRequest(struct ldapsrv_call *call)
 376 {
 377         struct ldap_CompareRequest *req = &call->request.r.CompareRequest;
 378         struct ldapsrv_partition *part;
 379
 380         DEBUG(10, ("CompareRequest"));
 381         DEBUGADD(10, (" dn: %s", req->dn));
 382
 383         part = ldapsrv_get_partition(call->conn, req->dn);
 384
 385         if (!part->ops->Compare) {
 386                 ldapsrv_unwilling(call, 53);
 387                 return;
 388         }
 389
 390         part->ops->Compare(part, call, req);
 391 }
 392
 393 static void ldapsrv_AbandonRequest(struct ldapsrv_call *call)
 394 {
 395 /*      struct ldap_AbandonRequest *req = &call->request.r.AbandonRequest;*/
 396         DEBUG(10, ("AbandonRequest\n"));
 397 }
 398
 399 static void ldapsrv_ExtendedRequest(struct ldapsrv_call *call)
 400 {
 401 /*      struct ldap_ExtendedRequest *req = &call->request.r.ExtendedRequest;*/
 402         struct ldapsrv_reply *reply;
 403
 404         DEBUG(10, ("Extended\n"));
 405
 406         reply = ldapsrv_init_reply(call, LDAP_TAG_ExtendedResponse);
 407         if (!reply) {
 408                 ldapsrv_terminate_connection(call->conn, "ldapsrv_init_reply() failed");
 409                 return;
 410         }
 411
 412         ZERO_STRUCT(reply->msg.r);
 413
 414         ldapsrv_queue_reply(call, reply);
 415 }
 416
 417 static void ldapsrv_do_call(struct ldapsrv_call *call)
 418 {
 419         switch(call->request.type) {
 420         case LDAP_TAG_BindRequest:
 421                 ldapsrv_BindRequest(call);
 422                 break;
 423         case LDAP_TAG_UnbindRequest:
 424                 ldapsrv_UnbindRequest(call);
 425                 break;
 426         case LDAP_TAG_SearchRequest:
 427                 ldapsrv_SearchRequest(call);
 428                 break;
 429         case LDAP_TAG_ModifyRequest:
 430                 ldapsrv_ModifyRequest(call);
 431                 break;
 432         case LDAP_TAG_AddRequest:
 433                 ldapsrv_AddRequest(call);
 434                 break;
 435         case LDAP_TAG_DelRequest:
 436                 ldapsrv_DelRequest(call);
 437                 break;
 438         case LDAP_TAG_ModifyDNRequest:
 439                 ldapsrv_ModifyDNRequest(call);
 440                 break;
 441         case LDAP_TAG_CompareRequest:
 442                 ldapsrv_CompareRequest(call);
 443                 break;
 444         case LDAP_TAG_AbandonRequest:
 445                 ldapsrv_AbandonRequest(call);
 446                 break;
 447         case LDAP_TAG_ExtendedRequest:
 448                 ldapsrv_ExtendedRequest(call);
 449                 break;
 450         default:
 451                 ldapsrv_unwilling(call, 2);
 452                 break;
 453         }
 454 }
 455
 456 static void ldapsrv_do_responses(struct ldapsrv_connection *conn)
 457 {
 458         struct ldapsrv_call *call, *next_call = NULL;
 459         struct ldapsrv_reply *reply, *next_reply = NULL;
 460
 461         for (call=conn->calls; call; call=next_call) {
 462                 for (reply=call->replies; reply; reply=next_reply) {
 463                         if (!ldap_append_to_buf(&reply->msg, &conn->out_buffer)) {
 464                                 ldapsrv_terminate_connection(conn, "append_to_buf() failed");
 465                                 return;
 466                         }
 467                         next_reply = reply->next;
 468                         DLIST_REMOVE(call->replies, reply);
 469                         reply->state = LDAPSRV_REPLY_STATE_SEND;
 470                         talloc_free(reply);
 471                 }
 472                 next_call = call->next;
 473                 DLIST_REMOVE(conn->calls, call);
 474                 call->state = LDAPSRV_CALL_STATE_COMPLETE;
 475                 talloc_free(call);
 476         }
 477 }
 478
 479 /*
 480   called when a LDAP socket becomes readable
 481 */
 482 static void ldapsrv_recv(struct server_connection *conn, time_t t,
 483                          uint16_t flags)
 484 {
 485         struct ldapsrv_connection *ldap_conn = conn->private_data;
 486         uint8_t *buf;
 487         int buf_length, msg_length;
 488         DATA_BLOB blob;
 489         ASN1_DATA data;
 490         struct ldapsrv_call *call;
 491
 492         DEBUG(10,("ldapsrv_recv\n"));
 493
 494         if (!read_into_buf(conn->socket, &ldap_conn->in_buffer)) {
 495                 ldapsrv_terminate_connection(ldap_conn, "read_into_buf() failed");
 496                 return;
 497         }
 498
 499         peek_into_read_buf(&ldap_conn->in_buffer, &buf, &buf_length);
 500
 501         while (buf_length > 0) {
 502
 503                 peek_into_read_buf(&ldap_conn->in_buffer, &buf, &buf_length);
 504                 /* LDAP Messages are always SEQUENCES */
 505
 506                 if (!asn1_object_length(buf, buf_length, ASN1_SEQUENCE(0),
 507                                         &msg_length)) {
 508                         ldapsrv_terminate_connection(ldap_conn, "asn1_object_length() failed");
 509                         return;
 510                 }
 511
 512                 if (buf_length < msg_length) {
 513                         /* Not enough yet */
 514                         break;
 515                 }
 516
 517                 /* We've got a complete LDAP request in the in-buffer, convert
 518                  * that to a ldap_message and put it into the incoming
 519                  * queue. */
 520
 521                 blob.data = buf;
 522                 blob.length = msg_length;
 523
 524                 if (!asn1_load(&data, blob)) {
 525                         ldapsrv_terminate_connection(ldap_conn, "asn1_load() failed");
 526                         return;
 527                 }
 528
 529                 call = talloc_p(ldap_conn, struct ldapsrv_call);
 530                 if (!call) {
 531                         ldapsrv_terminate_connection(ldap_conn, "no memory");
 532                         return;
 533                 }
 534
 535                 ZERO_STRUCTP(call);
 536                 call->state = LDAPSRV_CALL_STATE_NEW;
 537                 call->conn = ldap_conn;
 538                 call->request.mem_ctx = call;
 539
 540                 if (!ldap_decode(&data, &call->request)) {
 541                         dump_data(0,buf, msg_length);
 542                         ldapsrv_terminate_connection(ldap_conn, "ldap_decode() failed");
 543                         return;
 544                 }
 545
 546                 DLIST_ADD_END(ldap_conn->calls, call,
 547                               struct ldapsrv_call *);
 548
 549                 consumed_from_buf(&ldap_conn->in_buffer, msg_length);
 550
 551                 ldapsrv_do_call(call);
 552
 553                 peek_into_read_buf(&ldap_conn->in_buffer, &buf, &buf_length);
 554         }
 555
 556         ldapsrv_do_responses(ldap_conn);
 557
 558         if (ldap_conn->out_buffer.length > 0) {
 559                 conn->event.fde->flags |= EVENT_FD_WRITE;
 560         }
 561
 562         return;
 563 }
 564
 565 /*
 566   called when a LDAP socket becomes writable
 567 */
 568 static void ldapsrv_send(struct server_connection *conn, time_t t,
 569                          uint16_t flags)
 570 {
 571         struct ldapsrv_connection *ldap_conn = conn->private_data;
 572
 573         DEBUG(10,("ldapsrv_send\n"));
 574
 575         if (!write_from_buf(conn->socket, &ldap_conn->out_buffer)) {
 576                 ldapsrv_terminate_connection(ldap_conn, "write_from_buf() failed");
 577                 return;
 578         }
 579
 580         if (ldap_conn->out_buffer.length == 0) {
 581                 conn->event.fde->flags &= ~EVENT_FD_WRITE;
 582         }
 583
 584         return;
 585 }
 586
 587 /*
 588   called when connection is idle
 589 */
 590 static void ldapsrv_idle(struct server_connection *conn, time_t t)
 591 {
 592         DEBUG(10,("ldapsrv_idle: not implemented!\n"));
 593         return;
 594 }
 595
 596 static void ldapsrv_close(struct server_connection *conn, const char *reason)
 597 {
 598         struct ldapsrv_connection *ldap_conn = conn->private_data;
 599
 600         talloc_free(ldap_conn);
 601
 602         return;
 603 }
 604
 605 /*
 606   initialise a server_context from a open socket and register a event handler
 607   for reading from that socket
 608 */
 609 static void ldapsrv_accept(struct server_connection *conn)
 610 {
 611         struct ldapsrv_connection *ldap_conn;
 612
 613         DEBUG(5, ("ldapsrv_accept\n"));
 614
 615         ldap_conn = talloc_p(conn, struct ldapsrv_connection);
 616
 617         if (ldap_conn == NULL)
 618                 return;
 619
 620         ZERO_STRUCTP(ldap_conn);
 621         ldap_conn->connection = conn;
 622
 623         conn->private_data = ldap_conn;
 624
 625         return;
 626 }
 627
 628 /*
 629   called on a fatal error that should cause this server to terminate
 630 */
 631 static void ldapsrv_exit(struct server_service *service, const char *reason)
 632 {
 633         DEBUG(1,("ldapsrv_exit\n"));
 634         return;
 635 }
 636
 637 static const struct server_service_ops ldap_server_ops = {
 638         .name                   = "ldap",
 639         .service_init           = ldapsrv_init,
 640         .accept_connection      = ldapsrv_accept,
 641         .recv_handler           = ldapsrv_recv,
 642         .send_handler           = ldapsrv_send,
 643         .idle_handler           = ldapsrv_idle,
 644         .close_connection       = ldapsrv_close,
 645         .service_exit           = ldapsrv_exit,
 646 };
 647
 648 const struct server_service_ops *ldapsrv_get_ops(void)
 649 {
 650         return &ldap_server_ops;
 651 }
 652
 653 NTSTATUS server_service_ldap_init(void)
 654 {
 655         return NT_STATUS_OK;
 656 }