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 3 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, see <http://www.gnu.org/licenses/>.
26 #include "lib/util/asn1.h"
27 #include "lib/util/dlinklist.h"
28 #include "lib/events/events.h"
29 #include "lib/socket/socket.h"
30 #include "libcli/ldap/ldap.h"
31 #include "libcli/ldap/ldap_proto.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"
38 #include "param/param.h"
39 #include "libcli/resolve/resolve.h"
43 create a new ldap_connection stucture. The event context is optional
45 _PUBLIC_ struct ldap_connection *ldap4_new_connection(TALLOC_CTX *mem_ctx,
46 struct loadparm_context *lp_ctx,
47 struct event_context *ev)
49 struct ldap_connection *conn;
51 conn = talloc_zero(mem_ctx, struct ldap_connection);
57 ev = event_context_init(conn);
64 conn->next_messageid = 1;
65 conn->event.event_ctx = ev;
67 conn->lp_ctx = lp_ctx;
69 /* set a reasonable request timeout */
72 /* explicitly avoid reconnections by default */
73 conn->reconnect.max_retries = 0;
79 the connection is dead
81 static void ldap_connection_dead(struct ldap_connection *conn)
83 struct ldap_request *req;
85 /* return an error for any pending request ... */
86 while (conn->pending) {
88 DLIST_REMOVE(req->conn->pending, req);
89 req->state = LDAP_REQUEST_DONE;
90 req->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
96 talloc_free(conn->sock); /* this will also free event.fde */
97 talloc_free(conn->packet);
99 conn->event.fde = NULL;
103 static void ldap_reconnect(struct ldap_connection *conn);
108 static void ldap_error_handler(void *private_data, NTSTATUS status)
110 struct ldap_connection *conn = talloc_get_type(private_data,
111 struct ldap_connection);
112 ldap_connection_dead(conn);
114 /* but try to reconnect so that the ldb client can go on */
115 ldap_reconnect(conn);
120 match up with a pending message, adding to the replies list
122 static void ldap_match_message(struct ldap_connection *conn, struct ldap_message *msg)
124 struct ldap_request *req;
127 for (req=conn->pending; req; req=req->next) {
128 if (req->messageid == msg->messageid) break;
130 /* match a zero message id to the last request sent.
131 It seems that servers send 0 if unable to parse */
132 if (req == NULL && msg->messageid == 0) {
136 DEBUG(0,("ldap: no matching message id for %u\n",
142 /* Check for undecoded critical extensions */
143 for (i=0; msg->controls && msg->controls[i]; i++) {
144 if (!msg->controls_decoded[i] &&
145 msg->controls[i]->critical) {
146 req->status = NT_STATUS_LDAP(LDAP_UNAVAILABLE_CRITICAL_EXTENSION);
147 req->state = LDAP_REQUEST_DONE;
148 DLIST_REMOVE(conn->pending, req);
156 /* add to the list of replies received */
157 talloc_steal(req, msg);
158 req->replies = talloc_realloc(req, req->replies,
159 struct ldap_message *, req->num_replies+1);
160 if (req->replies == NULL) {
161 req->status = NT_STATUS_NO_MEMORY;
162 req->state = LDAP_REQUEST_DONE;
163 DLIST_REMOVE(conn->pending, req);
170 req->replies[req->num_replies] = talloc_steal(req->replies, msg);
173 if (msg->type != LDAP_TAG_SearchResultEntry &&
174 msg->type != LDAP_TAG_SearchResultReference) {
175 /* currently only search results expect multiple
177 req->state = LDAP_REQUEST_DONE;
178 DLIST_REMOVE(conn->pending, req);
188 decode/process LDAP data
190 static NTSTATUS ldap_recv_handler(void *private_data, DATA_BLOB blob)
193 struct ldap_connection *conn = talloc_get_type(private_data,
194 struct ldap_connection);
195 struct ldap_message *msg = talloc(conn, struct ldap_message);
196 struct asn1_data *asn1 = asn1_init(conn);
198 if (asn1 == NULL || msg == NULL) {
199 return NT_STATUS_LDAP(LDAP_PROTOCOL_ERROR);
202 if (!asn1_load(asn1, blob)) {
205 return NT_STATUS_LDAP(LDAP_PROTOCOL_ERROR);
208 status = ldap_decode(asn1, msg);
209 if (!NT_STATUS_IS_OK(status)) {
214 ldap_match_message(conn, msg);
216 data_blob_free(&blob);
221 /* Handle read events, from the GENSEC socket callback, or real events */
222 void ldap_read_io_handler(void *private_data, uint16_t flags)
224 struct ldap_connection *conn = talloc_get_type(private_data,
225 struct ldap_connection);
226 packet_recv(conn->packet);
230 handle ldap socket events
232 static void ldap_io_handler(struct event_context *ev, struct fd_event *fde,
233 uint16_t flags, void *private_data)
235 struct ldap_connection *conn = talloc_get_type(private_data,
236 struct ldap_connection);
237 if (flags & EVENT_FD_WRITE) {
238 packet_queue_run(conn->packet);
239 if (!tls_enabled(conn->sock)) return;
241 if (flags & EVENT_FD_READ) {
242 ldap_read_io_handler(private_data, flags);
249 static NTSTATUS ldap_parse_basic_url(TALLOC_CTX *mem_ctx, const char *url,
250 char **host, uint16_t *port, bool *ldaps)
258 SMB_ASSERT(sizeof(protocol)>10 && sizeof(tmp_host)>254);
260 ret = sscanf(url, "%10[^:]://%254[^:/]:%d", protocol, tmp_host, &tmp_port);
262 return NT_STATUS_INVALID_PARAMETER;
265 if (strequal(protocol, "ldap")) {
268 } else if (strequal(protocol, "ldaps")) {
272 DEBUG(0, ("unrecognised ldap protocol (%s)!\n", protocol));
273 return NT_STATUS_PROTOCOL_UNREACHABLE;
279 *host = talloc_strdup(mem_ctx, tmp_host);
280 NT_STATUS_HAVE_NO_MEMORY(*host);
286 connect to a ldap server
289 struct ldap_connect_state {
290 struct composite_context *ctx;
291 struct ldap_connection *conn;
294 static void ldap_connect_recv_unix_conn(struct composite_context *ctx);
295 static void ldap_connect_recv_tcp_conn(struct composite_context *ctx);
297 _PUBLIC_ struct composite_context *ldap_connect_send(struct ldap_connection *conn,
300 struct composite_context *result, *ctx;
301 struct ldap_connect_state *state;
305 result = talloc_zero(NULL, struct composite_context);
306 if (result == NULL) goto failed;
307 result->state = COMPOSITE_STATE_IN_PROGRESS;
308 result->async.fn = NULL;
309 result->event_ctx = conn->event.event_ctx;
311 state = talloc(result, struct ldap_connect_state);
312 if (state == NULL) goto failed;
314 result->private_data = state;
318 if (conn->reconnect.url == NULL) {
319 conn->reconnect.url = talloc_strdup(conn, url);
320 if (conn->reconnect.url == NULL) goto failed;
324 SMB_ASSERT(sizeof(protocol)>10);
326 ret = sscanf(url, "%10[^:]://", protocol);
331 if (strequal(protocol, "ldapi")) {
332 struct socket_address *unix_addr;
335 NTSTATUS status = socket_create("unix", SOCKET_TYPE_STREAM, &conn->sock, 0);
336 if (!NT_STATUS_IS_OK(status)) {
339 talloc_steal(conn, conn->sock);
340 SMB_ASSERT(sizeof(protocol)>10);
341 SMB_ASSERT(sizeof(path)>1024);
343 /* The %c specifier doesn't null terminate :-( */
345 ret = sscanf(url, "%10[^:]://%1025c", protocol, path);
347 composite_error(state->ctx, NT_STATUS_INVALID_PARAMETER);
351 rfc1738_unescape(path);
353 unix_addr = socket_address_from_strings(conn, conn->sock->backend_name,
359 ctx = socket_connect_send(conn->sock, NULL, unix_addr,
360 0, lp_resolve_context(conn->lp_ctx), conn->event.event_ctx);
361 ctx->async.fn = ldap_connect_recv_unix_conn;
362 ctx->async.private_data = state;
365 NTSTATUS status = ldap_parse_basic_url(conn, url, &conn->host,
366 &conn->port, &conn->ldaps);
367 if (!NT_STATUS_IS_OK(state->ctx->status)) {
368 composite_error(state->ctx, status);
372 ctx = socket_connect_multi_send(state, conn->host, 1, &conn->port,
373 lp_resolve_context(conn->lp_ctx), conn->event.event_ctx);
374 if (ctx == NULL) goto failed;
376 ctx->async.fn = ldap_connect_recv_tcp_conn;
377 ctx->async.private_data = state;
385 static void ldap_connect_got_sock(struct composite_context *ctx,
386 struct ldap_connection *conn)
388 /* setup a handler for events on this socket */
389 conn->event.fde = event_add_fd(conn->event.event_ctx, conn->sock,
390 socket_get_fd(conn->sock),
391 EVENT_FD_READ | EVENT_FD_AUTOCLOSE, ldap_io_handler, conn);
392 if (conn->event.fde == NULL) {
393 composite_error(ctx, NT_STATUS_INTERNAL_ERROR);
397 socket_set_flags(conn->sock, SOCKET_FLAG_NOCLOSE);
399 talloc_steal(conn, conn->sock);
401 struct socket_context *tls_socket;
402 char *cafile = private_path(conn->sock, conn->lp_ctx, lp_tls_cafile(conn->lp_ctx));
404 if (!cafile || !*cafile) {
405 talloc_free(conn->sock);
409 tls_socket = tls_init_client(conn->sock, conn->event.fde, cafile);
412 if (tls_socket == NULL) {
413 talloc_free(conn->sock);
416 talloc_unlink(conn, conn->sock);
417 conn->sock = tls_socket;
418 talloc_steal(conn, conn->sock);
421 conn->packet = packet_init(conn);
422 if (conn->packet == NULL) {
423 talloc_free(conn->sock);
427 packet_set_private(conn->packet, conn);
428 packet_set_socket(conn->packet, conn->sock);
429 packet_set_callback(conn->packet, ldap_recv_handler);
430 packet_set_full_request(conn->packet, ldap_full_packet);
431 packet_set_error_handler(conn->packet, ldap_error_handler);
432 packet_set_event_context(conn->packet, conn->event.event_ctx);
433 packet_set_fde(conn->packet, conn->event.fde);
434 packet_set_serialise(conn->packet);
439 static void ldap_connect_recv_tcp_conn(struct composite_context *ctx)
441 struct ldap_connect_state *state =
442 talloc_get_type(ctx->async.private_data,
443 struct ldap_connect_state);
444 struct ldap_connection *conn = state->conn;
446 NTSTATUS status = socket_connect_multi_recv(ctx, state, &conn->sock,
448 if (!NT_STATUS_IS_OK(status)) {
449 composite_error(state->ctx, status);
453 ldap_connect_got_sock(state->ctx, conn);
456 static void ldap_connect_recv_unix_conn(struct composite_context *ctx)
458 struct ldap_connect_state *state =
459 talloc_get_type(ctx->async.private_data,
460 struct ldap_connect_state);
461 struct ldap_connection *conn = state->conn;
463 NTSTATUS status = socket_connect_recv(ctx);
465 if (!NT_STATUS_IS_OK(state->ctx->status)) {
466 composite_error(state->ctx, status);
470 ldap_connect_got_sock(state->ctx, conn);
473 _PUBLIC_ NTSTATUS ldap_connect_recv(struct composite_context *ctx)
475 NTSTATUS status = composite_wait(ctx);
480 _PUBLIC_ NTSTATUS ldap_connect(struct ldap_connection *conn, const char *url)
482 struct composite_context *ctx = ldap_connect_send(conn, url);
483 return ldap_connect_recv(ctx);
486 /* set reconnect parameters */
488 _PUBLIC_ void ldap_set_reconn_params(struct ldap_connection *conn, int max_retries)
491 conn->reconnect.max_retries = max_retries;
492 conn->reconnect.retries = 0;
493 conn->reconnect.previous = time(NULL);
497 /* Actually this function is NOT ASYNC safe, FIXME? */
498 static void ldap_reconnect(struct ldap_connection *conn)
501 time_t now = time(NULL);
503 /* do we have set up reconnect ? */
504 if (conn->reconnect.max_retries == 0) return;
506 /* is the retry time expired ? */
507 if (now > conn->reconnect.previous + 30) {
508 conn->reconnect.retries = 0;
509 conn->reconnect.previous = now;
512 /* are we reconnectind too often and too fast? */
513 if (conn->reconnect.retries > conn->reconnect.max_retries) return;
515 /* keep track of the number of reconnections */
516 conn->reconnect.retries++;
519 status = ldap_connect(conn, conn->reconnect.url);
520 if ( ! NT_STATUS_IS_OK(status)) {
525 status = ldap_rebind(conn);
526 if ( ! NT_STATUS_IS_OK(status)) {
527 ldap_connection_dead(conn);
531 /* destroy an open ldap request */
532 static int ldap_request_destructor(struct ldap_request *req)
534 if (req->state == LDAP_REQUEST_PENDING) {
535 DLIST_REMOVE(req->conn->pending, req);
541 called on timeout of a ldap request
543 static void ldap_request_timeout(struct event_context *ev, struct timed_event *te,
544 struct timeval t, void *private_data)
546 struct ldap_request *req = talloc_get_type(private_data, struct ldap_request);
547 req->status = NT_STATUS_IO_TIMEOUT;
548 if (req->state == LDAP_REQUEST_PENDING) {
549 DLIST_REMOVE(req->conn->pending, req);
551 req->state = LDAP_REQUEST_DONE;
559 called on completion of a one-way ldap request
561 static void ldap_request_complete(struct event_context *ev, struct timed_event *te,
562 struct timeval t, void *private_data)
564 struct ldap_request *req = talloc_get_type(private_data, struct ldap_request);
571 send a ldap message - async interface
573 _PUBLIC_ struct ldap_request *ldap_request_send(struct ldap_connection *conn,
574 struct ldap_message *msg)
576 struct ldap_request *req;
577 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
579 req = talloc_zero(conn, struct ldap_request);
580 if (req == NULL) return NULL;
582 if (conn->sock == NULL) {
583 status = NT_STATUS_INVALID_CONNECTION;
587 req->state = LDAP_REQUEST_SEND;
589 req->messageid = conn->next_messageid++;
590 if (conn->next_messageid == 0) {
591 conn->next_messageid = 1;
593 req->type = msg->type;
594 if (req->messageid == -1) {
598 talloc_set_destructor(req, ldap_request_destructor);
600 msg->messageid = req->messageid;
602 if (!ldap_encode(msg, &req->data, req)) {
603 status = NT_STATUS_INTERNAL_ERROR;
607 status = packet_send(conn->packet, req->data);
608 if (!NT_STATUS_IS_OK(status)) {
612 /* some requests don't expect a reply, so don't add those to the
614 if (req->type == LDAP_TAG_AbandonRequest ||
615 req->type == LDAP_TAG_UnbindRequest) {
616 req->status = NT_STATUS_OK;
617 req->state = LDAP_REQUEST_DONE;
618 /* we can't call the async callback now, as it isn't setup, so
619 call it as next event */
620 event_add_timed(conn->event.event_ctx, req, timeval_zero(),
621 ldap_request_complete, req);
625 req->state = LDAP_REQUEST_PENDING;
626 DLIST_ADD(conn->pending, req);
628 /* put a timeout on the request */
629 req->time_event = event_add_timed(conn->event.event_ctx, req,
630 timeval_current_ofs(conn->timeout, 0),
631 ldap_request_timeout, req);
636 req->status = status;
637 req->state = LDAP_REQUEST_ERROR;
638 event_add_timed(conn->event.event_ctx, req, timeval_zero(),
639 ldap_request_complete, req);
646 wait for a request to complete
647 note that this does not destroy the request
649 _PUBLIC_ NTSTATUS ldap_request_wait(struct ldap_request *req)
651 while (req->state < LDAP_REQUEST_DONE) {
652 if (event_loop_once(req->conn->event.event_ctx) != 0) {
653 req->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
662 a mapping of ldap response code to strings
664 static const struct {
665 enum ldap_result_code code;
667 } ldap_code_map[] = {
668 #define _LDAP_MAP_CODE(c) { c, #c }
669 _LDAP_MAP_CODE(LDAP_SUCCESS),
670 _LDAP_MAP_CODE(LDAP_OPERATIONS_ERROR),
671 _LDAP_MAP_CODE(LDAP_PROTOCOL_ERROR),
672 _LDAP_MAP_CODE(LDAP_TIME_LIMIT_EXCEEDED),
673 _LDAP_MAP_CODE(LDAP_SIZE_LIMIT_EXCEEDED),
674 _LDAP_MAP_CODE(LDAP_COMPARE_FALSE),
675 _LDAP_MAP_CODE(LDAP_COMPARE_TRUE),
676 _LDAP_MAP_CODE(LDAP_AUTH_METHOD_NOT_SUPPORTED),
677 _LDAP_MAP_CODE(LDAP_STRONG_AUTH_REQUIRED),
678 _LDAP_MAP_CODE(LDAP_REFERRAL),
679 _LDAP_MAP_CODE(LDAP_ADMIN_LIMIT_EXCEEDED),
680 _LDAP_MAP_CODE(LDAP_UNAVAILABLE_CRITICAL_EXTENSION),
681 _LDAP_MAP_CODE(LDAP_CONFIDENTIALITY_REQUIRED),
682 _LDAP_MAP_CODE(LDAP_SASL_BIND_IN_PROGRESS),
683 _LDAP_MAP_CODE(LDAP_NO_SUCH_ATTRIBUTE),
684 _LDAP_MAP_CODE(LDAP_UNDEFINED_ATTRIBUTE_TYPE),
685 _LDAP_MAP_CODE(LDAP_INAPPROPRIATE_MATCHING),
686 _LDAP_MAP_CODE(LDAP_CONSTRAINT_VIOLATION),
687 _LDAP_MAP_CODE(LDAP_ATTRIBUTE_OR_VALUE_EXISTS),
688 _LDAP_MAP_CODE(LDAP_INVALID_ATTRIBUTE_SYNTAX),
689 _LDAP_MAP_CODE(LDAP_NO_SUCH_OBJECT),
690 _LDAP_MAP_CODE(LDAP_ALIAS_PROBLEM),
691 _LDAP_MAP_CODE(LDAP_INVALID_DN_SYNTAX),
692 _LDAP_MAP_CODE(LDAP_ALIAS_DEREFERENCING_PROBLEM),
693 _LDAP_MAP_CODE(LDAP_INAPPROPRIATE_AUTHENTICATION),
694 _LDAP_MAP_CODE(LDAP_INVALID_CREDENTIALS),
695 _LDAP_MAP_CODE(LDAP_INSUFFICIENT_ACCESS_RIGHTS),
696 _LDAP_MAP_CODE(LDAP_BUSY),
697 _LDAP_MAP_CODE(LDAP_UNAVAILABLE),
698 _LDAP_MAP_CODE(LDAP_UNWILLING_TO_PERFORM),
699 _LDAP_MAP_CODE(LDAP_LOOP_DETECT),
700 _LDAP_MAP_CODE(LDAP_NAMING_VIOLATION),
701 _LDAP_MAP_CODE(LDAP_OBJECT_CLASS_VIOLATION),
702 _LDAP_MAP_CODE(LDAP_NOT_ALLOWED_ON_NON_LEAF),
703 _LDAP_MAP_CODE(LDAP_NOT_ALLOWED_ON_RDN),
704 _LDAP_MAP_CODE(LDAP_ENTRY_ALREADY_EXISTS),
705 _LDAP_MAP_CODE(LDAP_OBJECT_CLASS_MODS_PROHIBITED),
706 _LDAP_MAP_CODE(LDAP_AFFECTS_MULTIPLE_DSAS),
707 _LDAP_MAP_CODE(LDAP_OTHER)
711 used to setup the status code from a ldap response
713 _PUBLIC_ NTSTATUS ldap_check_response(struct ldap_connection *conn, struct ldap_Result *r)
716 const char *codename = "unknown";
718 if (r->resultcode == LDAP_SUCCESS) {
722 if (conn->last_error) {
723 talloc_free(conn->last_error);
726 for (i=0;i<ARRAY_SIZE(ldap_code_map);i++) {
727 if (r->resultcode == ldap_code_map[i].code) {
728 codename = ldap_code_map[i].str;
733 conn->last_error = talloc_asprintf(conn, "LDAP error %u %s - %s <%s> <%s>",
736 r->dn?r->dn:"(NULL)",
737 r->errormessage?r->errormessage:"",
738 r->referral?r->referral:"");
740 return NT_STATUS_LDAP(r->resultcode);
744 return error string representing the last error
746 _PUBLIC_ const char *ldap_errstr(struct ldap_connection *conn,
750 if (NT_STATUS_IS_LDAP(status) && conn->last_error != NULL) {
751 return talloc_strdup(mem_ctx, conn->last_error);
753 return talloc_asprintf(mem_ctx, "LDAP client internal error: %s", nt_errstr(status));
758 return the Nth result message, waiting if necessary
760 _PUBLIC_ NTSTATUS ldap_result_n(struct ldap_request *req, int n, struct ldap_message **msg)
764 NT_STATUS_HAVE_NO_MEMORY(req);
766 while (req->state < LDAP_REQUEST_DONE && n >= req->num_replies) {
767 if (event_loop_once(req->conn->event.event_ctx) != 0) {
768 return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
772 if (n < req->num_replies) {
773 *msg = req->replies[n];
777 if (!NT_STATUS_IS_OK(req->status)) {
781 return NT_STATUS_NO_MORE_ENTRIES;
786 return a single result message, checking if it is of the expected LDAP type
788 _PUBLIC_ NTSTATUS ldap_result_one(struct ldap_request *req, struct ldap_message **msg, int type)
791 status = ldap_result_n(req, 0, msg);
792 if (!NT_STATUS_IS_OK(status)) {
795 if ((*msg)->type != type) {
797 return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
803 a simple ldap transaction, for single result requests that only need a status code
804 this relies on single valued requests having the response type == request type + 1
806 _PUBLIC_ NTSTATUS ldap_transaction(struct ldap_connection *conn, struct ldap_message *msg)
808 struct ldap_request *req = ldap_request_send(conn, msg);
809 struct ldap_message *res;
811 status = ldap_result_n(req, 0, &res);
812 if (!NT_STATUS_IS_OK(status)) {
816 if (res->type != msg->type + 1) {
818 return NT_STATUS_LDAP(LDAP_PROTOCOL_ERROR);
820 status = ldap_check_response(conn, &res->r.GeneralResult);