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"
42 create a new ldap_connection stucture. The event context is optional
44 _PUBLIC_ struct ldap_connection *ldap4_new_connection(TALLOC_CTX *mem_ctx,
45 struct loadparm_context *lp_ctx,
46 struct tevent_context *ev)
48 struct ldap_connection *conn;
54 conn = talloc_zero(mem_ctx, struct ldap_connection);
59 conn->next_messageid = 1;
60 conn->event.event_ctx = ev;
62 conn->lp_ctx = lp_ctx;
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 talloc_free(conn->sock); /* this will also free event.fde */
81 talloc_free(conn->packet);
83 conn->event.fde = NULL;
86 /* return an error for any pending request ... */
87 while (conn->pending) {
89 DLIST_REMOVE(req->conn->pending, req);
90 req->state = LDAP_REQUEST_DONE;
91 req->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
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;
122 for (req=conn->pending; req; req=req->next) {
123 if (req->messageid == msg->messageid) break;
125 /* match a zero message id to the last request sent.
126 It seems that servers send 0 if unable to parse */
127 if (req == NULL && msg->messageid == 0) {
131 DEBUG(0,("ldap: no matching message id for %u\n",
137 /* Check for undecoded critical extensions */
138 for (i=0; msg->controls && msg->controls[i]; i++) {
139 if (!msg->controls_decoded[i] &&
140 msg->controls[i]->critical) {
141 req->status = NT_STATUS_LDAP(LDAP_UNAVAILABLE_CRITICAL_EXTENSION);
142 req->state = LDAP_REQUEST_DONE;
143 DLIST_REMOVE(conn->pending, req);
151 /* add to the list of replies received */
152 talloc_steal(req, msg);
153 req->replies = talloc_realloc(req, req->replies,
154 struct ldap_message *, req->num_replies+1);
155 if (req->replies == NULL) {
156 req->status = NT_STATUS_NO_MEMORY;
157 req->state = LDAP_REQUEST_DONE;
158 DLIST_REMOVE(conn->pending, req);
165 req->replies[req->num_replies] = talloc_steal(req->replies, msg);
168 if (msg->type != LDAP_TAG_SearchResultEntry &&
169 msg->type != LDAP_TAG_SearchResultReference) {
170 /* currently only search results expect multiple
172 req->state = LDAP_REQUEST_DONE;
173 DLIST_REMOVE(conn->pending, req);
183 decode/process LDAP data
185 static NTSTATUS ldap_recv_handler(void *private_data, DATA_BLOB blob)
188 struct ldap_connection *conn = talloc_get_type(private_data,
189 struct ldap_connection);
190 struct ldap_message *msg = talloc(conn, struct ldap_message);
191 struct asn1_data *asn1 = asn1_init(conn);
193 if (asn1 == NULL || msg == NULL) {
194 return NT_STATUS_LDAP(LDAP_PROTOCOL_ERROR);
197 if (!asn1_load(asn1, blob)) {
200 return NT_STATUS_LDAP(LDAP_PROTOCOL_ERROR);
203 status = ldap_decode(asn1, msg);
204 if (!NT_STATUS_IS_OK(status)) {
209 ldap_match_message(conn, msg);
211 data_blob_free(&blob);
216 /* Handle read events, from the GENSEC socket callback, or real events */
217 void ldap_read_io_handler(void *private_data, uint16_t flags)
219 struct ldap_connection *conn = talloc_get_type(private_data,
220 struct ldap_connection);
221 packet_recv(conn->packet);
225 handle ldap socket events
227 static void ldap_io_handler(struct tevent_context *ev, struct tevent_fd *fde,
228 uint16_t flags, void *private_data)
230 struct ldap_connection *conn = talloc_get_type(private_data,
231 struct ldap_connection);
232 if (flags & EVENT_FD_WRITE) {
233 packet_queue_run(conn->packet);
234 if (!tls_enabled(conn->sock)) return;
236 if (flags & EVENT_FD_READ) {
237 ldap_read_io_handler(private_data, flags);
244 static NTSTATUS ldap_parse_basic_url(TALLOC_CTX *mem_ctx, const char *url,
245 char **host, uint16_t *port, bool *ldaps)
253 SMB_ASSERT(sizeof(protocol)>10 && sizeof(tmp_host)>254);
255 ret = sscanf(url, "%10[^:]://%254[^:/]:%d", protocol, tmp_host, &tmp_port);
257 return NT_STATUS_INVALID_PARAMETER;
260 if (strequal(protocol, "ldap")) {
263 } else if (strequal(protocol, "ldaps")) {
267 DEBUG(0, ("unrecognised ldap protocol (%s)!\n", protocol));
268 return NT_STATUS_PROTOCOL_UNREACHABLE;
274 *host = talloc_strdup(mem_ctx, tmp_host);
275 NT_STATUS_HAVE_NO_MEMORY(*host);
281 connect to a ldap server
284 struct ldap_connect_state {
285 struct composite_context *ctx;
286 struct ldap_connection *conn;
289 static void ldap_connect_recv_unix_conn(struct composite_context *ctx);
290 static void ldap_connect_recv_tcp_conn(struct composite_context *ctx);
292 _PUBLIC_ struct composite_context *ldap_connect_send(struct ldap_connection *conn,
295 struct composite_context *result, *ctx;
296 struct ldap_connect_state *state;
300 result = talloc_zero(conn, struct composite_context);
301 if (result == NULL) goto failed;
302 result->state = COMPOSITE_STATE_IN_PROGRESS;
303 result->async.fn = NULL;
304 result->event_ctx = conn->event.event_ctx;
306 state = talloc(result, struct ldap_connect_state);
307 if (state == NULL) goto failed;
309 result->private_data = state;
313 if (conn->reconnect.url == NULL) {
314 conn->reconnect.url = talloc_strdup(conn, url);
315 if (conn->reconnect.url == NULL) goto failed;
319 SMB_ASSERT(sizeof(protocol)>10);
321 ret = sscanf(url, "%10[^:]://", protocol);
326 if (strequal(protocol, "ldapi")) {
327 struct socket_address *unix_addr;
330 NTSTATUS status = socket_create("unix", SOCKET_TYPE_STREAM, &conn->sock, 0);
331 if (!NT_STATUS_IS_OK(status)) {
334 talloc_steal(conn, conn->sock);
335 SMB_ASSERT(sizeof(protocol)>10);
336 SMB_ASSERT(sizeof(path)>1024);
338 /* LDAPI connections are to localhost, so give the local host name as the target for gensec */
339 conn->host = talloc_asprintf(conn, "%s.%s", lp_netbios_name(conn->lp_ctx), lp_realm(conn->lp_ctx));
340 if (composite_nomem(conn->host, state->ctx)) {
344 /* The %c specifier doesn't null terminate :-( */
346 ret = sscanf(url, "%10[^:]://%1025c", protocol, path);
348 composite_error(state->ctx, NT_STATUS_INVALID_PARAMETER);
352 rfc1738_unescape(path);
354 unix_addr = socket_address_from_strings(conn, conn->sock->backend_name,
360 ctx = socket_connect_send(conn->sock, NULL, unix_addr,
361 0, conn->event.event_ctx);
362 ctx->async.fn = ldap_connect_recv_unix_conn;
363 ctx->async.private_data = state;
366 NTSTATUS status = ldap_parse_basic_url(conn, url, &conn->host,
367 &conn->port, &conn->ldaps);
368 if (!NT_STATUS_IS_OK(state->ctx->status)) {
369 composite_error(state->ctx, status);
373 ctx = socket_connect_multi_send(state, conn->host, 1, &conn->port,
374 lp_resolve_context(conn->lp_ctx), conn->event.event_ctx);
375 if (ctx == NULL) goto failed;
377 ctx->async.fn = ldap_connect_recv_tcp_conn;
378 ctx->async.private_data = state;
386 static void ldap_connect_got_sock(struct composite_context *ctx,
387 struct ldap_connection *conn)
389 /* setup a handler for events on this socket */
390 conn->event.fde = tevent_add_fd(conn->event.event_ctx, conn->sock,
391 socket_get_fd(conn->sock),
392 TEVENT_FD_READ, ldap_io_handler, conn);
393 if (conn->event.fde == NULL) {
394 composite_error(ctx, NT_STATUS_INTERNAL_ERROR);
398 tevent_fd_set_close_fn(conn->event.fde, socket_tevent_fd_close_fn);
399 socket_set_flags(conn->sock, SOCKET_FLAG_NOCLOSE);
401 talloc_steal(conn, conn->sock);
403 struct socket_context *tls_socket;
404 struct socket_context *tmp_socket;
405 char *cafile = lp_tls_cafile(conn->sock, conn->lp_ctx);
407 if (!cafile || !*cafile) {
408 talloc_free(conn->sock);
412 tls_socket = tls_init_client(conn->sock, conn->event.fde, cafile);
415 if (tls_socket == NULL) {
416 talloc_free(conn->sock);
420 /* the original socket, must become a child of the tls socket */
421 tmp_socket = conn->sock;
422 conn->sock = talloc_steal(conn, tls_socket);
423 talloc_steal(conn->sock, tmp_socket);
426 conn->packet = packet_init(conn);
427 if (conn->packet == NULL) {
428 talloc_free(conn->sock);
432 packet_set_private(conn->packet, conn);
433 packet_set_socket(conn->packet, conn->sock);
434 packet_set_callback(conn->packet, ldap_recv_handler);
435 packet_set_full_request(conn->packet, ldap_full_packet);
436 packet_set_error_handler(conn->packet, ldap_error_handler);
437 packet_set_event_context(conn->packet, conn->event.event_ctx);
438 packet_set_fde(conn->packet, conn->event.fde);
439 /* packet_set_serialise(conn->packet); */
444 static void ldap_connect_recv_tcp_conn(struct composite_context *ctx)
446 struct ldap_connect_state *state =
447 talloc_get_type(ctx->async.private_data,
448 struct ldap_connect_state);
449 struct ldap_connection *conn = state->conn;
451 NTSTATUS status = socket_connect_multi_recv(ctx, state, &conn->sock,
453 if (!NT_STATUS_IS_OK(status)) {
454 composite_error(state->ctx, status);
458 ldap_connect_got_sock(state->ctx, conn);
461 static void ldap_connect_recv_unix_conn(struct composite_context *ctx)
463 struct ldap_connect_state *state =
464 talloc_get_type(ctx->async.private_data,
465 struct ldap_connect_state);
466 struct ldap_connection *conn = state->conn;
468 NTSTATUS status = socket_connect_recv(ctx);
470 if (!NT_STATUS_IS_OK(state->ctx->status)) {
471 composite_error(state->ctx, status);
475 ldap_connect_got_sock(state->ctx, conn);
478 _PUBLIC_ NTSTATUS ldap_connect_recv(struct composite_context *ctx)
480 NTSTATUS status = composite_wait(ctx);
485 _PUBLIC_ NTSTATUS ldap_connect(struct ldap_connection *conn, const char *url)
487 struct composite_context *ctx = ldap_connect_send(conn, url);
488 return ldap_connect_recv(ctx);
491 /* set reconnect parameters */
493 _PUBLIC_ void ldap_set_reconn_params(struct ldap_connection *conn, int max_retries)
496 conn->reconnect.max_retries = max_retries;
497 conn->reconnect.retries = 0;
498 conn->reconnect.previous = time(NULL);
502 /* Actually this function is NOT ASYNC safe, FIXME? */
503 static void ldap_reconnect(struct ldap_connection *conn)
506 time_t now = time(NULL);
508 /* do we have set up reconnect ? */
509 if (conn->reconnect.max_retries == 0) return;
511 /* is the retry time expired ? */
512 if (now > conn->reconnect.previous + 30) {
513 conn->reconnect.retries = 0;
514 conn->reconnect.previous = now;
517 /* are we reconnectind too often and too fast? */
518 if (conn->reconnect.retries > conn->reconnect.max_retries) return;
520 /* keep track of the number of reconnections */
521 conn->reconnect.retries++;
524 status = ldap_connect(conn, conn->reconnect.url);
525 if ( ! NT_STATUS_IS_OK(status)) {
530 status = ldap_rebind(conn);
531 if ( ! NT_STATUS_IS_OK(status)) {
532 ldap_connection_dead(conn);
536 /* destroy an open ldap request */
537 static int ldap_request_destructor(struct ldap_request *req)
539 if (req->state == LDAP_REQUEST_PENDING) {
540 DLIST_REMOVE(req->conn->pending, req);
546 called on timeout of a ldap request
548 static void ldap_request_timeout(struct tevent_context *ev, struct tevent_timer *te,
549 struct timeval t, void *private_data)
551 struct ldap_request *req = talloc_get_type(private_data, struct ldap_request);
552 req->status = NT_STATUS_IO_TIMEOUT;
553 if (req->state == LDAP_REQUEST_PENDING) {
554 DLIST_REMOVE(req->conn->pending, req);
556 req->state = LDAP_REQUEST_DONE;
564 called on completion of a one-way ldap request
566 static void ldap_request_complete(struct tevent_context *ev, struct tevent_timer *te,
567 struct timeval t, void *private_data)
569 struct ldap_request *req = talloc_get_type(private_data, struct ldap_request);
576 send a ldap message - async interface
578 _PUBLIC_ struct ldap_request *ldap_request_send(struct ldap_connection *conn,
579 struct ldap_message *msg)
581 struct ldap_request *req;
582 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
584 req = talloc_zero(conn, struct ldap_request);
585 if (req == NULL) return NULL;
587 if (conn->sock == NULL) {
588 status = NT_STATUS_INVALID_CONNECTION;
592 req->state = LDAP_REQUEST_SEND;
594 req->messageid = conn->next_messageid++;
595 if (conn->next_messageid == 0) {
596 conn->next_messageid = 1;
598 req->type = msg->type;
599 if (req->messageid == -1) {
603 talloc_set_destructor(req, ldap_request_destructor);
605 msg->messageid = req->messageid;
607 if (!ldap_encode(msg, &req->data, req)) {
608 status = NT_STATUS_INTERNAL_ERROR;
612 status = packet_send(conn->packet, req->data);
613 if (!NT_STATUS_IS_OK(status)) {
617 /* some requests don't expect a reply, so don't add those to the
619 if (req->type == LDAP_TAG_AbandonRequest ||
620 req->type == LDAP_TAG_UnbindRequest) {
621 req->status = NT_STATUS_OK;
622 req->state = LDAP_REQUEST_DONE;
623 /* we can't call the async callback now, as it isn't setup, so
624 call it as next event */
625 event_add_timed(conn->event.event_ctx, req, timeval_zero(),
626 ldap_request_complete, req);
630 req->state = LDAP_REQUEST_PENDING;
631 DLIST_ADD(conn->pending, req);
633 /* put a timeout on the request */
634 req->time_event = event_add_timed(conn->event.event_ctx, req,
635 timeval_current_ofs(conn->timeout, 0),
636 ldap_request_timeout, req);
641 req->status = status;
642 req->state = LDAP_REQUEST_ERROR;
643 event_add_timed(conn->event.event_ctx, req, timeval_zero(),
644 ldap_request_complete, req);
651 wait for a request to complete
652 note that this does not destroy the request
654 _PUBLIC_ NTSTATUS ldap_request_wait(struct ldap_request *req)
656 while (req->state < LDAP_REQUEST_DONE) {
657 if (event_loop_once(req->conn->event.event_ctx) != 0) {
658 req->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
667 a mapping of ldap response code to strings
669 static const struct {
670 enum ldap_result_code code;
672 } ldap_code_map[] = {
673 #define _LDAP_MAP_CODE(c) { c, #c }
674 _LDAP_MAP_CODE(LDAP_SUCCESS),
675 _LDAP_MAP_CODE(LDAP_OPERATIONS_ERROR),
676 _LDAP_MAP_CODE(LDAP_PROTOCOL_ERROR),
677 _LDAP_MAP_CODE(LDAP_TIME_LIMIT_EXCEEDED),
678 _LDAP_MAP_CODE(LDAP_SIZE_LIMIT_EXCEEDED),
679 _LDAP_MAP_CODE(LDAP_COMPARE_FALSE),
680 _LDAP_MAP_CODE(LDAP_COMPARE_TRUE),
681 _LDAP_MAP_CODE(LDAP_AUTH_METHOD_NOT_SUPPORTED),
682 _LDAP_MAP_CODE(LDAP_STRONG_AUTH_REQUIRED),
683 _LDAP_MAP_CODE(LDAP_REFERRAL),
684 _LDAP_MAP_CODE(LDAP_ADMIN_LIMIT_EXCEEDED),
685 _LDAP_MAP_CODE(LDAP_UNAVAILABLE_CRITICAL_EXTENSION),
686 _LDAP_MAP_CODE(LDAP_CONFIDENTIALITY_REQUIRED),
687 _LDAP_MAP_CODE(LDAP_SASL_BIND_IN_PROGRESS),
688 _LDAP_MAP_CODE(LDAP_NO_SUCH_ATTRIBUTE),
689 _LDAP_MAP_CODE(LDAP_UNDEFINED_ATTRIBUTE_TYPE),
690 _LDAP_MAP_CODE(LDAP_INAPPROPRIATE_MATCHING),
691 _LDAP_MAP_CODE(LDAP_CONSTRAINT_VIOLATION),
692 _LDAP_MAP_CODE(LDAP_ATTRIBUTE_OR_VALUE_EXISTS),
693 _LDAP_MAP_CODE(LDAP_INVALID_ATTRIBUTE_SYNTAX),
694 _LDAP_MAP_CODE(LDAP_NO_SUCH_OBJECT),
695 _LDAP_MAP_CODE(LDAP_ALIAS_PROBLEM),
696 _LDAP_MAP_CODE(LDAP_INVALID_DN_SYNTAX),
697 _LDAP_MAP_CODE(LDAP_ALIAS_DEREFERENCING_PROBLEM),
698 _LDAP_MAP_CODE(LDAP_INAPPROPRIATE_AUTHENTICATION),
699 _LDAP_MAP_CODE(LDAP_INVALID_CREDENTIALS),
700 _LDAP_MAP_CODE(LDAP_INSUFFICIENT_ACCESS_RIGHTS),
701 _LDAP_MAP_CODE(LDAP_BUSY),
702 _LDAP_MAP_CODE(LDAP_UNAVAILABLE),
703 _LDAP_MAP_CODE(LDAP_UNWILLING_TO_PERFORM),
704 _LDAP_MAP_CODE(LDAP_LOOP_DETECT),
705 _LDAP_MAP_CODE(LDAP_NAMING_VIOLATION),
706 _LDAP_MAP_CODE(LDAP_OBJECT_CLASS_VIOLATION),
707 _LDAP_MAP_CODE(LDAP_NOT_ALLOWED_ON_NON_LEAF),
708 _LDAP_MAP_CODE(LDAP_NOT_ALLOWED_ON_RDN),
709 _LDAP_MAP_CODE(LDAP_ENTRY_ALREADY_EXISTS),
710 _LDAP_MAP_CODE(LDAP_OBJECT_CLASS_MODS_PROHIBITED),
711 _LDAP_MAP_CODE(LDAP_AFFECTS_MULTIPLE_DSAS),
712 _LDAP_MAP_CODE(LDAP_OTHER)
716 used to setup the status code from a ldap response
718 _PUBLIC_ NTSTATUS ldap_check_response(struct ldap_connection *conn, struct ldap_Result *r)
721 const char *codename = "unknown";
723 if (r->resultcode == LDAP_SUCCESS) {
727 if (conn->last_error) {
728 talloc_free(conn->last_error);
731 for (i=0;i<ARRAY_SIZE(ldap_code_map);i++) {
732 if (r->resultcode == ldap_code_map[i].code) {
733 codename = ldap_code_map[i].str;
738 conn->last_error = talloc_asprintf(conn, "LDAP error %u %s - %s <%s> <%s>",
741 r->dn?r->dn:"(NULL)",
742 r->errormessage?r->errormessage:"",
743 r->referral?r->referral:"");
745 return NT_STATUS_LDAP(r->resultcode);
749 return error string representing the last error
751 _PUBLIC_ const char *ldap_errstr(struct ldap_connection *conn,
755 if (NT_STATUS_IS_LDAP(status) && conn->last_error != NULL) {
756 return talloc_strdup(mem_ctx, conn->last_error);
758 return talloc_asprintf(mem_ctx, "LDAP client internal error: %s", nt_errstr(status));
763 return the Nth result message, waiting if necessary
765 _PUBLIC_ NTSTATUS ldap_result_n(struct ldap_request *req, int n, struct ldap_message **msg)
769 NT_STATUS_HAVE_NO_MEMORY(req);
771 while (req->state < LDAP_REQUEST_DONE && n >= req->num_replies) {
772 if (event_loop_once(req->conn->event.event_ctx) != 0) {
773 return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
777 if (n < req->num_replies) {
778 *msg = req->replies[n];
782 if (!NT_STATUS_IS_OK(req->status)) {
786 return NT_STATUS_NO_MORE_ENTRIES;
791 return a single result message, checking if it is of the expected LDAP type
793 _PUBLIC_ NTSTATUS ldap_result_one(struct ldap_request *req, struct ldap_message **msg, int type)
796 status = ldap_result_n(req, 0, msg);
797 if (!NT_STATUS_IS_OK(status)) {
800 if ((*msg)->type != type) {
802 return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
808 a simple ldap transaction, for single result requests that only need a status code
809 this relies on single valued requests having the response type == request type + 1
811 _PUBLIC_ NTSTATUS ldap_transaction(struct ldap_connection *conn, struct ldap_message *msg)
813 struct ldap_request *req = ldap_request_send(conn, msg);
814 struct ldap_message *res;
816 status = ldap_result_n(req, 0, &res);
817 if (!NT_STATUS_IS_OK(status)) {
821 if (res->type != msg->type + 1) {
823 return NT_STATUS_LDAP(LDAP_PROTOCOL_ERROR);
825 status = ldap_check_response(conn, &res->r.GeneralResult);