2 Unix SMB/CIFS mplementation.
3 LDAP protocol helper functions for SAMBA
5 Copyright (C) Andrew Tridgell 2004
6 Copyright (C) Volker Lendecke 2004
7 Copyright (C) Stefan Metzmacher 2004
8 Copyright (C) Simo Sorce 2004
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 2 of the License, or
13 (at your option) any later version.
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.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include "libcli/util/asn_1.h"
28 #include "lib/util/dlinklist.h"
29 #include "lib/events/events.h"
30 #include "lib/socket/socket.h"
31 #include "libcli/ldap/ldap.h"
32 #include "libcli/ldap/ldap_client.h"
33 #include "libcli/composite/composite.h"
34 #include "lib/stream/packet.h"
35 #include "lib/tls/tls.h"
36 #include "auth/gensec/gensec.h"
37 #include "system/time.h"
41 create a new ldap_connection stucture. The event context is optional
43 struct ldap_connection *ldap4_new_connection(TALLOC_CTX *mem_ctx,
44 struct event_context *ev)
46 struct ldap_connection *conn;
48 conn = talloc_zero(mem_ctx, struct ldap_connection);
54 ev = event_context_init(conn);
61 conn->next_messageid = 1;
62 conn->event.event_ctx = ev;
64 /* set a reasonable request timeout */
67 /* explicitly avoid reconnections by default */
68 conn->reconnect.max_retries = 0;
74 the connection is dead
76 static void ldap_connection_dead(struct ldap_connection *conn)
78 struct ldap_request *req;
80 /* return an error for any pending request ... */
81 while (conn->pending) {
83 DLIST_REMOVE(req->conn->pending, req);
84 req->state = LDAP_REQUEST_DONE;
85 req->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
91 talloc_free(conn->sock); /* this will also free event.fde */
92 talloc_free(conn->packet);
94 conn->event.fde = NULL;
98 static void ldap_reconnect(struct ldap_connection *conn);
103 static void ldap_error_handler(void *private_data, NTSTATUS status)
105 struct ldap_connection *conn = talloc_get_type(private_data,
106 struct ldap_connection);
107 ldap_connection_dead(conn);
109 /* but try to reconnect so that the ldb client can go on */
110 ldap_reconnect(conn);
115 match up with a pending message, adding to the replies list
117 static void ldap_match_message(struct ldap_connection *conn, struct ldap_message *msg)
119 struct ldap_request *req;
121 for (req=conn->pending; req; req=req->next) {
122 if (req->messageid == msg->messageid) break;
124 /* match a zero message id to the last request sent.
125 It seems that servers send 0 if unable to parse */
126 if (req == NULL && msg->messageid == 0) {
130 DEBUG(0,("ldap: no matching message id for %u\n",
136 /* add to the list of replies received */
137 talloc_steal(req, msg);
138 req->replies = talloc_realloc(req, req->replies,
139 struct ldap_message *, req->num_replies+1);
140 if (req->replies == NULL) {
141 req->status = NT_STATUS_NO_MEMORY;
142 req->state = LDAP_REQUEST_DONE;
143 DLIST_REMOVE(conn->pending, req);
150 req->replies[req->num_replies] = talloc_steal(req->replies, msg);
153 if (msg->type != LDAP_TAG_SearchResultEntry &&
154 msg->type != LDAP_TAG_SearchResultReference) {
155 /* currently only search results expect multiple
157 req->state = LDAP_REQUEST_DONE;
158 DLIST_REMOVE(conn->pending, req);
168 decode/process LDAP data
170 static NTSTATUS ldap_recv_handler(void *private_data, DATA_BLOB blob)
173 struct ldap_connection *conn = talloc_get_type(private_data,
174 struct ldap_connection);
175 struct ldap_message *msg = talloc(conn, struct ldap_message);
176 struct asn1_data *asn1 = asn1_init(conn);
179 return NT_STATUS_LDAP(LDAP_PROTOCOL_ERROR);
182 if (!asn1_load(asn1, blob)) {
183 return NT_STATUS_LDAP(LDAP_PROTOCOL_ERROR);
186 status = ldap_decode(asn1, msg);
187 if (!NT_STATUS_IS_OK(status)) {
192 ldap_match_message(conn, msg);
194 data_blob_free(&blob);
199 /* Handle read events, from the GENSEC socket callback, or real events */
200 void ldap_read_io_handler(void *private_data, uint16_t flags)
202 struct ldap_connection *conn = talloc_get_type(private_data,
203 struct ldap_connection);
204 packet_recv(conn->packet);
208 handle ldap socket events
210 static void ldap_io_handler(struct event_context *ev, struct fd_event *fde,
211 uint16_t flags, void *private_data)
213 struct ldap_connection *conn = talloc_get_type(private_data,
214 struct ldap_connection);
215 if (flags & EVENT_FD_WRITE) {
216 packet_queue_run(conn->packet);
217 if (!tls_enabled(conn->sock)) return;
219 if (flags & EVENT_FD_READ) {
220 ldap_read_io_handler(private_data, flags);
227 static NTSTATUS ldap_parse_basic_url(TALLOC_CTX *mem_ctx, const char *url,
228 char **host, uint16_t *port, BOOL *ldaps)
236 SMB_ASSERT(sizeof(protocol)>10 && sizeof(tmp_host)>254);
238 ret = sscanf(url, "%10[^:]://%254[^:/]:%d", protocol, tmp_host, &tmp_port);
240 return NT_STATUS_INVALID_PARAMETER;
243 if (strequal(protocol, "ldap")) {
246 } else if (strequal(protocol, "ldaps")) {
250 DEBUG(0, ("unrecognised ldap protocol (%s)!\n", protocol));
251 return NT_STATUS_PROTOCOL_UNREACHABLE;
257 *host = talloc_strdup(mem_ctx, tmp_host);
258 NT_STATUS_HAVE_NO_MEMORY(*host);
264 connect to a ldap server
267 struct ldap_connect_state {
268 struct composite_context *ctx;
269 struct ldap_connection *conn;
272 static void ldap_connect_recv_unix_conn(struct composite_context *ctx);
273 static void ldap_connect_recv_tcp_conn(struct composite_context *ctx);
275 struct composite_context *ldap_connect_send(struct ldap_connection *conn,
278 struct composite_context *result, *ctx;
279 struct ldap_connect_state *state;
283 result = talloc_zero(NULL, struct composite_context);
284 if (result == NULL) goto failed;
285 result->state = COMPOSITE_STATE_IN_PROGRESS;
286 result->async.fn = NULL;
287 result->event_ctx = conn->event.event_ctx;
289 state = talloc(result, struct ldap_connect_state);
290 if (state == NULL) goto failed;
292 result->private_data = state;
296 if (conn->reconnect.url == NULL) {
297 conn->reconnect.url = talloc_strdup(conn, url);
298 if (conn->reconnect.url == NULL) goto failed;
302 SMB_ASSERT(sizeof(protocol)>10);
304 ret = sscanf(url, "%10[^:]://", protocol);
309 if (strequal(protocol, "ldapi")) {
310 struct socket_address *unix_addr;
313 NTSTATUS status = socket_create("unix", SOCKET_TYPE_STREAM, &conn->sock, 0);
314 if (!NT_STATUS_IS_OK(status)) {
317 talloc_steal(conn, conn->sock);
318 SMB_ASSERT(sizeof(protocol)>10);
319 SMB_ASSERT(sizeof(path)>1024);
321 /* The %c specifier doesn't null terminate :-( */
323 ret = sscanf(url, "%10[^:]://%1025c", protocol, path);
325 composite_error(state->ctx, NT_STATUS_INVALID_PARAMETER);
329 rfc1738_unescape(path);
331 unix_addr = socket_address_from_strings(conn, conn->sock->backend_name,
337 ctx = socket_connect_send(conn->sock, NULL, unix_addr,
338 0, conn->event.event_ctx);
339 ctx->async.fn = ldap_connect_recv_unix_conn;
340 ctx->async.private_data = state;
343 NTSTATUS status = ldap_parse_basic_url(conn, url, &conn->host,
344 &conn->port, &conn->ldaps);
345 if (!NT_STATUS_IS_OK(state->ctx->status)) {
346 composite_error(state->ctx, status);
350 ctx = socket_connect_multi_send(state, conn->host, 1, &conn->port,
351 conn->event.event_ctx);
352 if (ctx == NULL) goto failed;
354 ctx->async.fn = ldap_connect_recv_tcp_conn;
355 ctx->async.private_data = state;
363 static void ldap_connect_got_sock(struct composite_context *ctx, struct ldap_connection *conn)
365 /* setup a handler for events on this socket */
366 conn->event.fde = event_add_fd(conn->event.event_ctx, conn->sock,
367 socket_get_fd(conn->sock),
368 EVENT_FD_READ, ldap_io_handler, conn);
369 if (conn->event.fde == NULL) {
370 composite_error(ctx, NT_STATUS_INTERNAL_ERROR);
374 talloc_steal(conn, conn->sock);
376 struct socket_context *tls_socket = tls_init_client(conn->sock, conn->event.fde);
377 if (tls_socket == NULL) {
378 talloc_free(conn->sock);
381 talloc_unlink(conn, conn->sock);
382 conn->sock = tls_socket;
383 talloc_steal(conn, conn->sock);
386 conn->packet = packet_init(conn);
387 if (conn->packet == NULL) {
388 talloc_free(conn->sock);
392 packet_set_private(conn->packet, conn);
393 packet_set_socket(conn->packet, conn->sock);
394 packet_set_callback(conn->packet, ldap_recv_handler);
395 packet_set_full_request(conn->packet, ldap_full_packet);
396 packet_set_error_handler(conn->packet, ldap_error_handler);
397 packet_set_event_context(conn->packet, conn->event.event_ctx);
398 packet_set_fde(conn->packet, conn->event.fde);
399 packet_set_serialise(conn->packet);
404 static void ldap_connect_recv_tcp_conn(struct composite_context *ctx)
406 struct ldap_connect_state *state =
407 talloc_get_type(ctx->async.private_data,
408 struct ldap_connect_state);
409 struct ldap_connection *conn = state->conn;
411 NTSTATUS status = socket_connect_multi_recv(ctx, state, &conn->sock,
413 if (!NT_STATUS_IS_OK(status)) {
414 composite_error(state->ctx, status);
418 ldap_connect_got_sock(state->ctx, conn);
421 static void ldap_connect_recv_unix_conn(struct composite_context *ctx)
423 struct ldap_connect_state *state =
424 talloc_get_type(ctx->async.private_data,
425 struct ldap_connect_state);
426 struct ldap_connection *conn = state->conn;
428 NTSTATUS status = socket_connect_recv(ctx);
430 if (!NT_STATUS_IS_OK(state->ctx->status)) {
431 composite_error(state->ctx, status);
435 ldap_connect_got_sock(state->ctx, conn);
438 _PUBLIC_ NTSTATUS ldap_connect_recv(struct composite_context *ctx)
440 NTSTATUS status = composite_wait(ctx);
445 NTSTATUS ldap_connect(struct ldap_connection *conn, const char *url)
447 struct composite_context *ctx = ldap_connect_send(conn, url);
448 return ldap_connect_recv(ctx);
451 /* set reconnect parameters */
453 void ldap_set_reconn_params(struct ldap_connection *conn, int max_retries)
456 conn->reconnect.max_retries = max_retries;
457 conn->reconnect.retries = 0;
458 conn->reconnect.previous = time(NULL);
462 /* Actually this function is NOT ASYNC safe, FIXME? */
463 static void ldap_reconnect(struct ldap_connection *conn)
466 time_t now = time(NULL);
468 /* do we have set up reconnect ? */
469 if (conn->reconnect.max_retries == 0) return;
471 /* is the retry time expired ? */
472 if (now > conn->reconnect.previous + 30) {
473 conn->reconnect.retries = 0;
474 conn->reconnect.previous = now;
477 /* are we reconnectind too often and too fast? */
478 if (conn->reconnect.retries > conn->reconnect.max_retries) return;
480 /* keep track of the number of reconnections */
481 conn->reconnect.retries++;
484 status = ldap_connect(conn, conn->reconnect.url);
485 if ( ! NT_STATUS_IS_OK(status)) {
490 status = ldap_rebind(conn);
491 if ( ! NT_STATUS_IS_OK(status)) {
492 ldap_connection_dead(conn);
496 /* destroy an open ldap request */
497 static int ldap_request_destructor(struct ldap_request *req)
499 if (req->state == LDAP_REQUEST_PENDING) {
500 DLIST_REMOVE(req->conn->pending, req);
506 called on timeout of a ldap request
508 static void ldap_request_timeout(struct event_context *ev, struct timed_event *te,
509 struct timeval t, void *private_data)
511 struct ldap_request *req = talloc_get_type(private_data, struct ldap_request);
512 req->status = NT_STATUS_IO_TIMEOUT;
513 if (req->state == LDAP_REQUEST_PENDING) {
514 DLIST_REMOVE(req->conn->pending, req);
516 req->state = LDAP_REQUEST_DONE;
524 called on completion of a one-way ldap request
526 static void ldap_request_complete(struct event_context *ev, struct timed_event *te,
527 struct timeval t, void *private_data)
529 struct ldap_request *req = talloc_get_type(private_data, struct ldap_request);
536 send a ldap message - async interface
538 struct ldap_request *ldap_request_send(struct ldap_connection *conn,
539 struct ldap_message *msg)
541 struct ldap_request *req;
542 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
544 req = talloc_zero(conn, struct ldap_request);
545 if (req == NULL) return NULL;
547 if (conn->sock == NULL) {
548 status = NT_STATUS_INVALID_CONNECTION;
552 req->state = LDAP_REQUEST_SEND;
554 req->messageid = conn->next_messageid++;
555 if (conn->next_messageid == 0) {
556 conn->next_messageid = 1;
558 req->type = msg->type;
559 if (req->messageid == -1) {
563 talloc_set_destructor(req, ldap_request_destructor);
565 msg->messageid = req->messageid;
567 if (!ldap_encode(msg, &req->data, req)) {
568 status = NT_STATUS_INTERNAL_ERROR;
572 status = packet_send(conn->packet, req->data);
573 if (!NT_STATUS_IS_OK(status)) {
577 /* some requests don't expect a reply, so don't add those to the
579 if (req->type == LDAP_TAG_AbandonRequest ||
580 req->type == LDAP_TAG_UnbindRequest) {
581 req->status = NT_STATUS_OK;
582 req->state = LDAP_REQUEST_DONE;
583 /* we can't call the async callback now, as it isn't setup, so
584 call it as next event */
585 event_add_timed(conn->event.event_ctx, req, timeval_zero(),
586 ldap_request_complete, req);
590 req->state = LDAP_REQUEST_PENDING;
591 DLIST_ADD(conn->pending, req);
593 /* put a timeout on the request */
594 req->time_event = event_add_timed(conn->event.event_ctx, req,
595 timeval_current_ofs(conn->timeout, 0),
596 ldap_request_timeout, req);
601 req->status = status;
602 req->state = LDAP_REQUEST_ERROR;
603 event_add_timed(conn->event.event_ctx, req, timeval_zero(),
604 ldap_request_complete, req);
611 wait for a request to complete
612 note that this does not destroy the request
614 NTSTATUS ldap_request_wait(struct ldap_request *req)
616 while (req->state < LDAP_REQUEST_DONE) {
617 if (event_loop_once(req->conn->event.event_ctx) != 0) {
618 req->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
627 a mapping of ldap response code to strings
629 static const struct {
630 enum ldap_result_code code;
632 } ldap_code_map[] = {
633 #define _LDAP_MAP_CODE(c) { c, #c }
634 _LDAP_MAP_CODE(LDAP_SUCCESS),
635 _LDAP_MAP_CODE(LDAP_OPERATIONS_ERROR),
636 _LDAP_MAP_CODE(LDAP_PROTOCOL_ERROR),
637 _LDAP_MAP_CODE(LDAP_TIME_LIMIT_EXCEEDED),
638 _LDAP_MAP_CODE(LDAP_SIZE_LIMIT_EXCEEDED),
639 _LDAP_MAP_CODE(LDAP_COMPARE_FALSE),
640 _LDAP_MAP_CODE(LDAP_COMPARE_TRUE),
641 _LDAP_MAP_CODE(LDAP_AUTH_METHOD_NOT_SUPPORTED),
642 _LDAP_MAP_CODE(LDAP_STRONG_AUTH_REQUIRED),
643 _LDAP_MAP_CODE(LDAP_REFERRAL),
644 _LDAP_MAP_CODE(LDAP_ADMIN_LIMIT_EXCEEDED),
645 _LDAP_MAP_CODE(LDAP_UNAVAILABLE_CRITICAL_EXTENSION),
646 _LDAP_MAP_CODE(LDAP_CONFIDENTIALITY_REQUIRED),
647 _LDAP_MAP_CODE(LDAP_SASL_BIND_IN_PROGRESS),
648 _LDAP_MAP_CODE(LDAP_NO_SUCH_ATTRIBUTE),
649 _LDAP_MAP_CODE(LDAP_UNDEFINED_ATTRIBUTE_TYPE),
650 _LDAP_MAP_CODE(LDAP_INAPPROPRIATE_MATCHING),
651 _LDAP_MAP_CODE(LDAP_CONSTRAINT_VIOLATION),
652 _LDAP_MAP_CODE(LDAP_ATTRIBUTE_OR_VALUE_EXISTS),
653 _LDAP_MAP_CODE(LDAP_INVALID_ATTRIBUTE_SYNTAX),
654 _LDAP_MAP_CODE(LDAP_NO_SUCH_OBJECT),
655 _LDAP_MAP_CODE(LDAP_ALIAS_PROBLEM),
656 _LDAP_MAP_CODE(LDAP_INVALID_DN_SYNTAX),
657 _LDAP_MAP_CODE(LDAP_ALIAS_DEREFERENCING_PROBLEM),
658 _LDAP_MAP_CODE(LDAP_INAPPROPRIATE_AUTHENTICATION),
659 _LDAP_MAP_CODE(LDAP_INVALID_CREDENTIALS),
660 _LDAP_MAP_CODE(LDAP_INSUFFICIENT_ACCESS_RIGHTS),
661 _LDAP_MAP_CODE(LDAP_BUSY),
662 _LDAP_MAP_CODE(LDAP_UNAVAILABLE),
663 _LDAP_MAP_CODE(LDAP_UNWILLING_TO_PERFORM),
664 _LDAP_MAP_CODE(LDAP_LOOP_DETECT),
665 _LDAP_MAP_CODE(LDAP_NAMING_VIOLATION),
666 _LDAP_MAP_CODE(LDAP_OBJECT_CLASS_VIOLATION),
667 _LDAP_MAP_CODE(LDAP_NOT_ALLOWED_ON_NON_LEAF),
668 _LDAP_MAP_CODE(LDAP_NOT_ALLOWED_ON_RDN),
669 _LDAP_MAP_CODE(LDAP_ENTRY_ALREADY_EXISTS),
670 _LDAP_MAP_CODE(LDAP_OBJECT_CLASS_MODS_PROHIBITED),
671 _LDAP_MAP_CODE(LDAP_AFFECTS_MULTIPLE_DSAS),
672 _LDAP_MAP_CODE(LDAP_OTHER)
676 used to setup the status code from a ldap response
678 NTSTATUS ldap_check_response(struct ldap_connection *conn, struct ldap_Result *r)
681 const char *codename = "unknown";
683 if (r->resultcode == LDAP_SUCCESS) {
687 if (conn->last_error) {
688 talloc_free(conn->last_error);
691 for (i=0;i<ARRAY_SIZE(ldap_code_map);i++) {
692 if (r->resultcode == ldap_code_map[i].code) {
693 codename = ldap_code_map[i].str;
698 conn->last_error = talloc_asprintf(conn, "LDAP error %u %s - %s <%s> <%s>",
701 r->dn?r->dn:"(NULL)",
702 r->errormessage?r->errormessage:"",
703 r->referral?r->referral:"");
705 return NT_STATUS_LDAP(r->resultcode);
709 return error string representing the last error
711 const char *ldap_errstr(struct ldap_connection *conn,
715 if (NT_STATUS_IS_LDAP(status) && conn->last_error != NULL) {
716 return talloc_strdup(mem_ctx, conn->last_error);
718 return talloc_asprintf(mem_ctx, "LDAP client internal error: %s", nt_errstr(status));
723 return the Nth result message, waiting if necessary
725 NTSTATUS ldap_result_n(struct ldap_request *req, int n, struct ldap_message **msg)
729 NT_STATUS_HAVE_NO_MEMORY(req);
731 while (req->state < LDAP_REQUEST_DONE && n >= req->num_replies) {
732 if (event_loop_once(req->conn->event.event_ctx) != 0) {
733 return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
737 if (n < req->num_replies) {
738 *msg = req->replies[n];
742 if (!NT_STATUS_IS_OK(req->status)) {
746 return NT_STATUS_NO_MORE_ENTRIES;
751 return a single result message, checking if it is of the expected LDAP type
753 NTSTATUS ldap_result_one(struct ldap_request *req, struct ldap_message **msg, int type)
756 status = ldap_result_n(req, 0, msg);
757 if (!NT_STATUS_IS_OK(status)) {
760 if ((*msg)->type != type) {
762 return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
768 a simple ldap transaction, for single result requests that only need a status code
769 this relies on single valued requests having the response type == request type + 1
771 NTSTATUS ldap_transaction(struct ldap_connection *conn, struct ldap_message *msg)
773 struct ldap_request *req = ldap_request_send(conn, msg);
774 struct ldap_message *res;
776 status = ldap_result_n(req, 0, &res);
777 if (!NT_STATUS_IS_OK(status)) {
781 if (res->type != msg->type + 1) {
783 return NT_STATUS_LDAP(LDAP_PROTOCOL_ERROR);
785 status = ldap_check_response(conn, &res->r.GeneralResult);