1/*	$OpenBSD: aldap.c,v 1.10 2022/03/31 09:03:48 martijn Exp $ */
2
3/*
4 * Copyright (c) 2008 Alexander Schrijver <aschrijver@openbsd.org>
5 * Copyright (c) 2006, 2007 Marc Balmer <mbalmer@openbsd.org>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#include <arpa/inet.h>
21#include <ctype.h>
22#include <errno.h>
23#include <inttypes.h>
24#include <string.h>
25#include <stdlib.h>
26#include <unistd.h>
27
28#include <event.h>
29
30#include "aldap.h"
31
32#if 0
33#define DEBUG
34#endif
35#define VERSION 3
36
37static struct ber_element	*ldap_parse_search_filter(struct ber_element *,
38				    char *);
39static struct ber_element	*ldap_do_parse_search_filter(
40				    struct ber_element *, char **);
41struct aldap_stringset		*aldap_get_stringset(struct ber_element *);
42char				*utoa(char *);
43static int			 isu8cont(unsigned char);
44char				*parseval(char *, size_t);
45int				aldap_create_page_control(struct ber_element *,
46				    int, struct aldap_page_control *);
47int				aldap_send(struct aldap *,
48				    struct ber_element *);
49unsigned int			aldap_application(struct ber_element *);
50
51#ifdef DEBUG
52void			 ldap_debug_elements(struct ber_element *);
53#endif
54
55#ifdef DEBUG
56#define DPRINTF(x...)	printf(x)
57#define LDAP_DEBUG(x, y)	do { fprintf(stderr, "*** " x "\n"); ldap_debug_elements(y); } while (0)
58#else
59#define DPRINTF(x...)	do { } while (0)
60#define LDAP_DEBUG(x, y)	do { } while (0)
61#endif
62
63unsigned int
64aldap_application(struct ber_element *elm)
65{
66	return BER_TYPE_OCTETSTRING;
67}
68
69int
70aldap_close(struct aldap *al)
71{
72	if (al->tls != NULL) {
73		tls_close(al->tls);
74		tls_free(al->tls);
75	}
76	close(al->fd);
77	ober_free(&al->ber);
78	evbuffer_free(al->buf);
79	free(al);
80
81	return (0);
82}
83
84struct aldap *
85aldap_init(int fd)
86{
87	struct aldap *a;
88
89	if ((a = calloc(1, sizeof(*a))) == NULL)
90		return NULL;
91	a->buf = evbuffer_new();
92	a->fd = fd;
93	ober_set_application(&a->ber, aldap_application);
94
95	return a;
96}
97
98int
99aldap_tls(struct aldap *ldap, struct tls_config *cfg, const char *name)
100{
101	ldap->tls = tls_client();
102	if (ldap->tls == NULL) {
103		ldap->err = ALDAP_ERR_OPERATION_FAILED;
104		return (-1);
105	}
106
107	if (tls_configure(ldap->tls, cfg) == -1) {
108		ldap->err = ALDAP_ERR_TLS_ERROR;
109		return (-1);
110	}
111
112	if (tls_connect_socket(ldap->tls, ldap->fd, name) == -1) {
113		ldap->err = ALDAP_ERR_TLS_ERROR;
114		return (-1);
115	}
116
117	if (tls_handshake(ldap->tls) == -1) {
118		ldap->err = ALDAP_ERR_TLS_ERROR;
119		return (-1);
120	}
121
122	return (0);
123}
124
125int
126aldap_send(struct aldap *ldap, struct ber_element *root)
127{
128	void *ptr;
129	char *data;
130	size_t len, done;
131	ssize_t error, wrote;
132
133	len = ober_calc_len(root);
134	error = ober_write_elements(&ldap->ber, root);
135	ober_free_elements(root);
136	if (error == -1)
137		return -1;
138
139	ober_get_writebuf(&ldap->ber, &ptr);
140	done = 0;
141	data = ptr;
142	while (len > 0) {
143		if (ldap->tls != NULL) {
144			wrote = tls_write(ldap->tls, data + done, len);
145			if (wrote == TLS_WANT_POLLIN ||
146			    wrote == TLS_WANT_POLLOUT)
147				continue;
148		} else
149			wrote = write(ldap->fd, data + done, len);
150
151		if (wrote == -1)
152			return -1;
153
154		len -= wrote;
155		done += wrote;
156	}
157
158	return 0;
159}
160
161int
162aldap_req_starttls(struct aldap *ldap)
163{
164	struct ber_element *root = NULL, *ber;
165
166	if ((root = ober_add_sequence(NULL)) == NULL)
167		goto fail;
168
169	ber = ober_printf_elements(root, "d{tst", ++ldap->msgid, BER_CLASS_APP,
170	    LDAP_REQ_EXTENDED, LDAP_STARTTLS_OID, BER_CLASS_CONTEXT, 0);
171	if (ber == NULL) {
172		ldap->err = ALDAP_ERR_OPERATION_FAILED;
173		goto fail;
174	}
175
176	if (aldap_send(ldap, root) == -1)
177		goto fail;
178
179	return (ldap->msgid);
180fail:
181	if (root != NULL)
182		ober_free_elements(root);
183
184	ldap->err = ALDAP_ERR_OPERATION_FAILED;
185	return (-1);
186}
187
188int
189aldap_bind(struct aldap *ldap, char *binddn, char *bindcred)
190{
191	struct ber_element *root = NULL, *elm;
192
193	if (binddn == NULL)
194		binddn = "";
195	if (bindcred == NULL)
196		bindcred = "";
197
198	if ((root = ober_add_sequence(NULL)) == NULL)
199		goto fail;
200
201	elm = ober_printf_elements(root, "d{tdsst", ++ldap->msgid, BER_CLASS_APP,
202	    LDAP_REQ_BIND, VERSION, binddn, bindcred, BER_CLASS_CONTEXT,
203	    LDAP_AUTH_SIMPLE);
204	if (elm == NULL)
205		goto fail;
206
207	LDAP_DEBUG("aldap_bind", root);
208
209	if (aldap_send(ldap, root) == -1) {
210		root = NULL;
211		goto fail;
212	}
213	return (ldap->msgid);
214fail:
215	if (root != NULL)
216		ober_free_elements(root);
217
218	ldap->err = ALDAP_ERR_OPERATION_FAILED;
219	return (-1);
220}
221
222int
223aldap_unbind(struct aldap *ldap)
224{
225	struct ber_element *root = NULL, *elm;
226
227	if ((root = ober_add_sequence(NULL)) == NULL)
228		goto fail;
229	elm = ober_printf_elements(root, "d{t", ++ldap->msgid, BER_CLASS_APP,
230	    LDAP_REQ_UNBIND_30);
231	if (elm == NULL)
232		goto fail;
233
234	LDAP_DEBUG("aldap_unbind", root);
235
236	if (aldap_send(ldap, root) == -1) {
237		root = NULL;
238		goto fail;
239	}
240	return (ldap->msgid);
241fail:
242	if (root != NULL)
243		ober_free_elements(root);
244
245	ldap->err = ALDAP_ERR_OPERATION_FAILED;
246
247	return (-1);
248}
249
250int
251aldap_search(struct aldap *ldap, char *basedn, enum scope scope, char *filter,
252    char **attrs, int typesonly, int sizelimit, int timelimit,
253    struct aldap_page_control *page)
254{
255	struct ber_element *root = NULL, *ber, *c;
256	int i;
257
258	if ((root = ober_add_sequence(NULL)) == NULL)
259		goto fail;
260
261	ber = ober_printf_elements(root, "d{t", ++ldap->msgid, BER_CLASS_APP,
262	    LDAP_REQ_SEARCH);
263	if (ber == NULL) {
264		ldap->err = ALDAP_ERR_OPERATION_FAILED;
265		goto fail;
266	}
267
268	c = ber;
269	ber = ober_printf_elements(ber, "sEEddb", basedn, (long long)scope,
270	                         (long long)LDAP_DEREF_NEVER, sizelimit,
271				 timelimit, typesonly);
272	if (ber == NULL) {
273		ldap->err = ALDAP_ERR_OPERATION_FAILED;
274		goto fail;
275	}
276
277	if ((ber = ldap_parse_search_filter(ber, filter)) == NULL) {
278		ldap->err = ALDAP_ERR_PARSER_ERROR;
279		goto fail;
280	}
281
282	if ((ber = ober_add_sequence(ber)) == NULL)
283		goto fail;
284	if (attrs != NULL)
285		for (i = 0; attrs[i] != NULL; i++) {
286			if ((ber = ober_add_string(ber, attrs[i])) == NULL)
287				goto fail;
288		}
289
290	aldap_create_page_control(c, 100, page);
291
292	LDAP_DEBUG("aldap_search", root);
293
294	if (aldap_send(ldap, root) == -1) {
295		root = NULL;
296		ldap->err = ALDAP_ERR_OPERATION_FAILED;
297		goto fail;
298	}
299
300	return (ldap->msgid);
301
302fail:
303	if (root != NULL)
304		ober_free_elements(root);
305
306	return (-1);
307}
308
309int
310aldap_create_page_control(struct ber_element *elm, int size,
311    struct aldap_page_control *page)
312{
313	ssize_t len;
314	struct ber c;
315	struct ber_element *ber = NULL;
316
317	c.br_wbuf = NULL;
318
319	ber = ober_add_sequence(NULL);
320
321	if (page == NULL) {
322		if (ober_printf_elements(ber, "ds", 50, "") == NULL)
323			goto fail;
324	} else {
325		if (ober_printf_elements(ber, "dx", 50, page->cookie,
326			    page->cookie_len) == NULL)
327			goto fail;
328	}
329
330	if ((len = ober_write_elements(&c, ber)) < 1)
331		goto fail;
332	if (ober_printf_elements(elm, "{t{sx", 2, 0, LDAP_PAGED_OID,
333		                c.br_wbuf, (size_t)len) == NULL)
334		goto fail;
335
336	ober_free_elements(ber);
337	ober_free(&c);
338	return len;
339fail:
340	if (ber != NULL)
341		ober_free_elements(ber);
342	ober_free(&c);
343
344	return (-1);
345}
346
347struct aldap_message *
348aldap_parse(struct aldap *ldap)
349{
350	int			 class;
351	unsigned int		 type;
352	long long		 msgid = 0;
353	struct aldap_message	*m;
354	struct ber_element	*a = NULL, *ep;
355	char			 rbuf[512];
356	int			 ret, retry;
357
358	if ((m = calloc(1, sizeof(struct aldap_message))) == NULL)
359		return NULL;
360
361	retry = 0;
362	while (m->msg == NULL) {
363		if (retry || EVBUFFER_LENGTH(ldap->buf) == 0) {
364			if (ldap->tls) {
365				ret = tls_read(ldap->tls, rbuf, sizeof(rbuf));
366				if (ret == TLS_WANT_POLLIN ||
367				    ret == TLS_WANT_POLLOUT)
368					continue;
369			} else
370				ret = read(ldap->fd, rbuf, sizeof(rbuf));
371
372			if (ret == -1) {
373				goto parsefail;
374			}
375
376			evbuffer_add(ldap->buf, rbuf, ret);
377		}
378
379		if (EVBUFFER_LENGTH(ldap->buf) > 0) {
380			ober_set_readbuf(&ldap->ber, EVBUFFER_DATA(ldap->buf),
381			    EVBUFFER_LENGTH(ldap->buf));
382			errno = 0;
383			m->msg = ober_read_elements(&ldap->ber, NULL);
384			if (errno != 0 && errno != ECANCELED) {
385				goto parsefail;
386			}
387
388			retry = 1;
389		}
390	}
391
392	evbuffer_drain(ldap->buf, ldap->ber.br_rptr - ldap->ber.br_rbuf);
393
394	LDAP_DEBUG("message", m->msg);
395
396	if (ober_scanf_elements(m->msg, "{ite", &msgid, &class, &type, &a) != 0)
397		goto parsefail;
398	m->msgid = msgid;
399	m->message_type = type;
400	m->protocol_op = a;
401
402	switch (m->message_type) {
403	case LDAP_RES_BIND:
404	case LDAP_RES_MODIFY:
405	case LDAP_RES_ADD:
406	case LDAP_RES_DELETE:
407	case LDAP_RES_MODRDN:
408	case LDAP_RES_COMPARE:
409	case LDAP_RES_SEARCH_RESULT:
410		if (ober_scanf_elements(m->protocol_op, "{EeSe",
411		    &m->body.res.rescode, &m->dn, &m->body.res.diagmsg) != 0)
412			goto parsefail;
413		if (m->body.res.rescode == LDAP_REFERRAL) {
414			a = m->body.res.diagmsg->be_next;
415			if (ober_scanf_elements(a, "{e", &m->references) != 0)
416				goto parsefail;
417		}
418		if (m->msg->be_sub) {
419			for (ep = m->msg->be_sub; ep != NULL; ep = ep->be_next) {
420				ober_scanf_elements(ep, "t", &class, &type);
421				if (class == 2 && type == 0)
422					m->page = aldap_parse_page_control(ep->be_sub->be_sub,
423					    ep->be_sub->be_sub->be_len);
424			}
425		} else
426			m->page = NULL;
427		break;
428	case LDAP_RES_SEARCH_ENTRY:
429		if (ober_scanf_elements(m->protocol_op, "{eS{e", &m->dn,
430		    &m->body.search.attrs) != 0)
431			goto parsefail;
432		break;
433	case LDAP_RES_SEARCH_REFERENCE:
434		if (ober_scanf_elements(m->protocol_op, "{e", &m->references) != 0)
435			goto parsefail;
436		break;
437	case LDAP_RES_EXTENDED:
438		if (ober_scanf_elements(m->protocol_op, "{E",
439		    &m->body.res.rescode) != 0) {
440			goto parsefail;
441		}
442		break;
443	}
444
445	return m;
446parsefail:
447	evbuffer_drain(ldap->buf, EVBUFFER_LENGTH(ldap->buf));
448	ldap->err = ALDAP_ERR_PARSER_ERROR;
449	aldap_freemsg(m);
450	return NULL;
451}
452
453struct aldap_page_control *
454aldap_parse_page_control(struct ber_element *control, size_t len)
455{
456	char *oid, *s;
457	char *encoded;
458	struct ber b;
459	struct ber_element *elm;
460	struct aldap_page_control *page;
461
462	b.br_wbuf = NULL;
463	ober_scanf_elements(control, "ss", &oid, &encoded);
464	ober_set_readbuf(&b, encoded, control->be_next->be_len);
465	elm = ober_read_elements(&b, NULL);
466
467	if ((page = malloc(sizeof(struct aldap_page_control))) == NULL) {
468		if (elm != NULL)
469			ober_free_elements(elm);
470		ober_free(&b);
471		return NULL;
472	}
473
474	ober_scanf_elements(elm->be_sub, "is", &page->size, &s);
475	page->cookie_len = elm->be_sub->be_next->be_len;
476
477	if ((page->cookie = malloc(page->cookie_len)) == NULL) {
478		if (elm != NULL)
479			ober_free_elements(elm);
480		ober_free(&b);
481		free(page);
482		return NULL;
483	}
484	memcpy(page->cookie, s, page->cookie_len);
485
486	ober_free_elements(elm);
487	ober_free(&b);
488	return page;
489}
490
491void
492aldap_freepage(struct aldap_page_control *page)
493{
494	free(page->cookie);
495	free(page);
496}
497
498void
499aldap_freemsg(struct aldap_message *msg)
500{
501	if (msg->msg)
502		ober_free_elements(msg->msg);
503	free(msg);
504}
505
506int
507aldap_get_resultcode(struct aldap_message *msg)
508{
509	return msg->body.res.rescode;
510}
511
512char *
513aldap_get_dn(struct aldap_message *msg)
514{
515	char *dn;
516
517	if (msg->dn == NULL)
518		return NULL;
519
520	if (ober_get_string(msg->dn, &dn) == -1)
521		return NULL;
522
523	return utoa(dn);
524}
525
526struct aldap_stringset *
527aldap_get_references(struct aldap_message *msg)
528{
529	if (msg->references == NULL)
530		return NULL;
531	return aldap_get_stringset(msg->references);
532}
533
534void
535aldap_free_references(char **values)
536{
537	int i;
538
539	if (values == NULL)
540		return;
541
542	for (i = 0; values[i] != NULL; i++)
543		free(values[i]);
544
545	free(values);
546}
547
548char *
549aldap_get_diagmsg(struct aldap_message *msg)
550{
551	char *s;
552
553	if (msg->body.res.diagmsg == NULL)
554		return NULL;
555
556	if (ober_get_string(msg->body.res.diagmsg, &s) == -1)
557		return NULL;
558
559	return utoa(s);
560}
561
562int
563aldap_count_attrs(struct aldap_message *msg)
564{
565	int i;
566	struct ber_element *a;
567
568	if (msg->body.search.attrs == NULL)
569		return (-1);
570
571	for (i = 0, a = msg->body.search.attrs;
572	    a != NULL && ober_get_eoc(a) != 0;
573	    i++, a = a->be_next)
574		;
575
576	return i;
577}
578
579int
580aldap_first_attr(struct aldap_message *msg, char **outkey,
581    struct aldap_stringset **outvalues)
582{
583	struct ber_element *b;
584	char *key;
585	struct aldap_stringset *ret;
586
587	if (msg->body.search.attrs == NULL)
588		goto fail;
589
590	if (ober_scanf_elements(msg->body.search.attrs, "{s(e)}",
591	    &key, &b) != 0)
592		goto fail;
593
594	msg->body.search.iter = msg->body.search.attrs->be_next;
595
596	if ((ret = aldap_get_stringset(b)) == NULL)
597		goto fail;
598
599	(*outvalues) = ret;
600	(*outkey) = utoa(key);
601
602	return (1);
603fail:
604	(*outkey) = NULL;
605	(*outvalues) = NULL;
606	return (-1);
607}
608
609int
610aldap_next_attr(struct aldap_message *msg, char **outkey,
611    struct aldap_stringset **outvalues)
612{
613	struct ber_element *a;
614	char *key;
615	struct aldap_stringset *ret;
616
617	if (msg->body.search.iter == NULL)
618		goto notfound;
619
620	LDAP_DEBUG("attr", msg->body.search.iter);
621
622	if (ober_get_eoc(msg->body.search.iter) == 0)
623		goto notfound;
624
625	if (ober_scanf_elements(msg->body.search.iter, "{s(e)}", &key, &a) != 0)
626		goto fail;
627
628	msg->body.search.iter = msg->body.search.iter->be_next;
629
630	if ((ret = aldap_get_stringset(a)) == NULL)
631		goto fail;
632
633	(*outvalues) = ret;
634	(*outkey) = utoa(key);
635
636	return (1);
637fail:
638notfound:
639	(*outkey) = NULL;
640	(*outvalues) = NULL;
641	return (-1);
642}
643
644int
645aldap_match_attr(struct aldap_message *msg, char *inkey,
646    struct aldap_stringset **outvalues)
647{
648	struct ber_element *a, *b;
649	char *descr = NULL;
650	struct aldap_stringset *ret;
651
652	if (msg->body.search.attrs == NULL)
653		goto fail;
654
655	LDAP_DEBUG("attr", msg->body.search.attrs);
656
657	for (a = msg->body.search.attrs;;) {
658		if (a == NULL)
659			goto notfound;
660		if (ober_get_eoc(a) == 0)
661			goto notfound;
662		if (ober_scanf_elements(a, "{s(e", &descr, &b) != 0)
663			goto fail;
664		if (strcasecmp(descr, inkey) == 0)
665			goto attrfound;
666		a = a->be_next;
667	}
668
669attrfound:
670	if ((ret = aldap_get_stringset(b)) == NULL)
671		goto fail;
672
673	(*outvalues) = ret;
674
675	return (1);
676fail:
677notfound:
678	(*outvalues) = NULL;
679	return (-1);
680}
681
682int
683aldap_free_attr(struct aldap_stringset *values)
684{
685	if (values == NULL)
686		return -1;
687
688	free(values->str);
689	free(values);
690
691	return (1);
692}
693
694void
695aldap_free_url(struct aldap_url *lu)
696{
697	free(lu->buffer);
698}
699
700int
701aldap_parse_url(const char *url, struct aldap_url *lu)
702{
703	char		*p, *forward, *forward2;
704	const char	*errstr = NULL;
705	int		 i;
706
707	if ((lu->buffer = p = strdup(url)) == NULL)
708		return (-1);
709
710	/* protocol */
711	if (strncasecmp(LDAP_URL, p, strlen(LDAP_URL)) == 0) {
712		lu->protocol = LDAP;
713		p += strlen(LDAP_URL);
714	} else if (strncasecmp(LDAPS_URL, p, strlen(LDAPS_URL)) == 0) {
715		lu->protocol = LDAPS;
716		p += strlen(LDAPS_URL);
717	} else if (strncasecmp(LDAPTLS_URL, p, strlen(LDAPTLS_URL)) == 0) {
718		lu->protocol = LDAPTLS;
719		p += strlen(LDAPTLS_URL);
720	} else if (strncasecmp(LDAPI_URL, p, strlen(LDAPI_URL)) == 0) {
721		lu->protocol = LDAPI;
722		p += strlen(LDAPI_URL);
723	} else
724		lu->protocol = -1;
725
726	/* host and optional port */
727	if ((forward = strchr(p, '/')) != NULL)
728		*forward = '\0';
729	/* find the optional port */
730	if ((forward2 = strchr(p, ':')) != NULL) {
731		*forward2 = '\0';
732		/* if a port is given */
733		if (*(forward2+1) != '\0') {
734#define PORT_MAX UINT16_MAX
735			lu->port = strtonum(++forward2, 0, PORT_MAX, &errstr);
736			if (errstr)
737				goto fail;
738		}
739	}
740	/* fail if no host is given */
741	if (strlen(p) == 0)
742		goto fail;
743	lu->host = p;
744	if (forward == NULL)
745		goto done;
746	/* p is assigned either a pointer to a character or to '\0' */
747	p = ++forward;
748	if (strlen(p) == 0)
749		goto done;
750
751	/* dn */
752	if ((forward = strchr(p, '?')) != NULL)
753		*forward = '\0';
754	lu->dn = p;
755	if (forward == NULL)
756		goto done;
757	/* p is assigned either a pointer to a character or to '\0' */
758	p = ++forward;
759	if (strlen(p) == 0)
760		goto done;
761
762	/* attributes */
763	if ((forward = strchr(p, '?')) != NULL)
764		*forward = '\0';
765	for (i = 0; i < MAXATTR; i++) {
766		if ((forward2 = strchr(p, ',')) == NULL) {
767			if (strlen(p) == 0)
768				break;
769			lu->attributes[i] = p;
770			break;
771		}
772		*forward2 = '\0';
773		lu->attributes[i] = p;
774		p = ++forward2;
775	}
776	if (forward == NULL)
777		goto done;
778	/* p is assigned either a pointer to a character or to '\0' */
779	p = ++forward;
780	if (strlen(p) == 0)
781		goto done;
782
783	/* scope */
784	if ((forward = strchr(p, '?')) != NULL)
785		*forward = '\0';
786	if (strcmp(p, "base") == 0)
787		lu->scope = LDAP_SCOPE_BASE;
788	else if (strcmp(p, "one") == 0)
789		lu->scope = LDAP_SCOPE_ONELEVEL;
790	else if (strcmp(p, "sub") == 0)
791		lu->scope = LDAP_SCOPE_SUBTREE;
792	else
793		goto fail;
794	if (forward == NULL)
795		goto done;
796	p = ++forward;
797	if (strlen(p) == 0)
798		goto done;
799
800	/* filter */
801	if (p)
802		lu->filter = p;
803done:
804	return (1);
805fail:
806	free(lu->buffer);
807	lu->buffer = NULL;
808	return (-1);
809}
810
811int
812aldap_search_url(struct aldap *ldap, char *url, int typesonly, int sizelimit,
813    int timelimit, struct aldap_page_control *page)
814{
815	struct aldap_url *lu;
816
817	if ((lu = calloc(1, sizeof(*lu))) == NULL)
818		return (-1);
819
820	if (aldap_parse_url(url, lu))
821		goto fail;
822
823	if (aldap_search(ldap, lu->dn, lu->scope, lu->filter, lu->attributes,
824	    typesonly, sizelimit, timelimit, page) == -1)
825		goto fail;
826
827	aldap_free_url(lu);
828	return (ldap->msgid);
829fail:
830	aldap_free_url(lu);
831	return (-1);
832}
833
834/*
835 * internal functions
836 */
837
838struct aldap_stringset *
839aldap_get_stringset(struct ber_element *elm)
840{
841	struct ber_element *a;
842	int i;
843	struct aldap_stringset *ret;
844
845	if (elm->be_type != BER_TYPE_OCTETSTRING)
846		return NULL;
847
848	if ((ret = malloc(sizeof(*ret))) == NULL)
849		return NULL;
850	for (a = elm, ret->len = 0; a != NULL && a->be_type ==
851	    BER_TYPE_OCTETSTRING; a = a->be_next, ret->len++)
852		;
853	if (ret->len == 0) {
854		free(ret);
855		return NULL;
856	}
857
858	if ((ret->str = reallocarray(NULL, ret->len,
859	    sizeof(*(ret->str)))) == NULL) {
860		free(ret);
861		return NULL;
862	}
863
864	for (a = elm, i = 0; a != NULL && a->be_type == BER_TYPE_OCTETSTRING;
865	    a = a->be_next, i++)
866		(void) ober_get_ostring(a, &(ret->str[i]));
867
868	return ret;
869}
870
871/*
872 * Base case for ldap_do_parse_search_filter
873 *
874 * returns:
875 *	struct ber_element *, ber_element tree
876 *	NULL, parse failed
877 */
878static struct ber_element *
879ldap_parse_search_filter(struct ber_element *ber, char *filter)
880{
881	struct ber_element *elm;
882	char *cp;
883
884	cp = filter;
885
886	if (cp == NULL || *cp == '\0') {
887		errno = EINVAL;
888		return (NULL);
889	}
890
891	if ((elm = ldap_do_parse_search_filter(ber, &cp)) == NULL)
892		return (NULL);
893
894	if (*cp != '\0') {
895		ober_free_elements(elm);
896		ober_link_elements(ber, NULL);
897		errno = EINVAL;
898		return (NULL);
899	}
900
901	return (elm);
902}
903
904/*
905 * Translate RFC4515 search filter string into ber_element tree
906 *
907 * returns:
908 *	struct ber_element *, ber_element tree
909 *	NULL, parse failed
910 *
911 * notes:
912 *	when cp is passed to a recursive invocation, it is updated
913 *	    to point one character beyond the filter that was passed
914 *	    i.e., cp jumps to "(filter)" upon return
915 *	                               ^
916 *	goto's used to discriminate error-handling based on error type
917 *	doesn't handle extended filters (yet)
918 *
919 */
920static struct ber_element *
921ldap_do_parse_search_filter(struct ber_element *prev, char **cpp)
922{
923	struct ber_element *elm, *root = NULL;
924	char *attr_desc, *attr_val, *parsed_val, *cp;
925	size_t len;
926	unsigned long type;
927
928	root = NULL;
929
930	/* cpp should pass in pointer to opening parenthesis of "(filter)" */
931	cp = *cpp;
932	if (*cp != '(')
933		goto syntaxfail;
934
935	switch (*++cp) {
936	case '&':		/* AND */
937	case '|':		/* OR */
938		if (*cp == '&')
939			type = LDAP_FILT_AND;
940		else
941			type = LDAP_FILT_OR;
942
943		if ((elm = ober_add_set(prev)) == NULL)
944			goto callfail;
945		root = elm;
946		ober_set_header(elm, BER_CLASS_CONTEXT, type);
947
948		if (*++cp != '(')		/* opening `(` of filter */
949			goto syntaxfail;
950
951		while (*cp == '(') {
952			if ((elm =
953			    ldap_do_parse_search_filter(elm, &cp)) == NULL)
954				goto bad;
955		}
956
957		if (*cp != ')')			/* trailing `)` of filter */
958			goto syntaxfail;
959		break;
960
961	case '!':		/* NOT */
962		if ((root = ober_add_sequence(prev)) == NULL)
963			goto callfail;
964		ober_set_header(root, BER_CLASS_CONTEXT, LDAP_FILT_NOT);
965
966		cp++;				/* now points to sub-filter */
967		if ((elm = ldap_do_parse_search_filter(root, &cp)) == NULL)
968			goto bad;
969
970		if (*cp != ')')			/* trailing `)` of filter */
971			goto syntaxfail;
972		break;
973
974	default:	/* SIMPLE || PRESENCE */
975		attr_desc = cp;
976
977		len = strcspn(cp, "()<>~=");
978		cp += len;
979		switch (*cp) {
980		case '~':
981			type = LDAP_FILT_APPR;
982			cp++;
983			break;
984		case '<':
985			type = LDAP_FILT_LE;
986			cp++;
987			break;
988		case '>':
989			type = LDAP_FILT_GE;
990			cp++;
991			break;
992		case '=':
993			type = LDAP_FILT_EQ;	/* assume EQ until disproven */
994			break;
995		case '(':
996		case ')':
997		default:
998			goto syntaxfail;
999		}
1000		attr_val = ++cp;
1001
1002		/* presence filter */
1003		if (strncmp(attr_val, "*)", 2) == 0) {
1004			cp++;			/* point to trailing `)` */
1005			if ((root =
1006			    ober_add_nstring(prev, attr_desc, len)) == NULL)
1007				goto bad;
1008
1009			ober_set_header(root, BER_CLASS_CONTEXT, LDAP_FILT_PRES);
1010			break;
1011		}
1012
1013		if ((root = ober_add_sequence(prev)) == NULL)
1014			goto callfail;
1015		ober_set_header(root, BER_CLASS_CONTEXT, type);
1016
1017		if ((elm = ober_add_nstring(root, attr_desc, len)) == NULL)
1018			goto callfail;
1019
1020		len = strcspn(attr_val, "*)");
1021		if (len == 0 && *cp != '*')
1022			goto syntaxfail;
1023		cp += len;
1024		if (*cp == '\0')
1025			goto syntaxfail;
1026
1027		if (*cp == '*') {	/* substring filter */
1028			int initial;
1029
1030			cp = attr_val;
1031
1032			ober_set_header(root, BER_CLASS_CONTEXT, LDAP_FILT_SUBS);
1033
1034			if ((elm = ober_add_sequence(elm)) == NULL)
1035				goto callfail;
1036
1037			for (initial = 1;; cp++, initial = 0) {
1038				attr_val = cp;
1039
1040				len = strcspn(attr_val, "*)");
1041				if (len == 0) {
1042					if (*cp == ')')
1043						break;
1044					else
1045						continue;
1046				}
1047				cp += len;
1048				if (*cp == '\0')
1049					goto syntaxfail;
1050
1051				if (initial)
1052					type = LDAP_FILT_SUBS_INIT;
1053				else if (*cp == ')')
1054					type = LDAP_FILT_SUBS_FIN;
1055				else
1056					type = LDAP_FILT_SUBS_ANY;
1057
1058				if ((parsed_val = parseval(attr_val, len)) ==
1059				    NULL)
1060					goto callfail;
1061				elm = ober_add_nstring(elm, parsed_val,
1062				    strlen(parsed_val));
1063				free(parsed_val);
1064				if (elm == NULL)
1065					goto callfail;
1066				ober_set_header(elm, BER_CLASS_CONTEXT, type);
1067				if (type == LDAP_FILT_SUBS_FIN)
1068					break;
1069			}
1070			break;
1071		}
1072
1073		if ((parsed_val = parseval(attr_val, len)) == NULL)
1074			goto callfail;
1075		elm = ober_add_nstring(elm, parsed_val, strlen(parsed_val));
1076		free(parsed_val);
1077		if (elm == NULL)
1078			goto callfail;
1079		break;
1080	}
1081
1082	cp++;		/* now points one char beyond the trailing `)` */
1083
1084	*cpp = cp;
1085	return (root);
1086
1087syntaxfail:		/* XXX -- error reporting */
1088callfail:
1089bad:
1090	if (root != NULL)
1091		ober_free_elements(root);
1092	ober_link_elements(prev, NULL);
1093	return (NULL);
1094}
1095
1096#ifdef DEBUG
1097/*
1098 * Display a list of ber elements.
1099 *
1100 */
1101void
1102ldap_debug_elements(struct ber_element *root)
1103{
1104	static int	 indent = 0;
1105	long long	 v;
1106	int		 d;
1107	char		*buf;
1108	size_t		 len;
1109	u_int		 i;
1110	int		 constructed;
1111	struct ber_oid	 o;
1112
1113	/* calculate lengths */
1114	ober_calc_len(root);
1115
1116	switch (root->be_encoding) {
1117	case BER_TYPE_SEQUENCE:
1118	case BER_TYPE_SET:
1119		constructed = root->be_encoding;
1120		break;
1121	default:
1122		constructed = 0;
1123		break;
1124	}
1125
1126	fprintf(stderr, "%*slen %lu ", indent, "", root->be_len);
1127	switch (root->be_class) {
1128	case BER_CLASS_UNIVERSAL:
1129		fprintf(stderr, "class: universal(%u) type: ", root->be_class);
1130		switch (root->be_type) {
1131		case BER_TYPE_EOC:
1132			fprintf(stderr, "end-of-content");
1133			break;
1134		case BER_TYPE_BOOLEAN:
1135			fprintf(stderr, "boolean");
1136			break;
1137		case BER_TYPE_INTEGER:
1138			fprintf(stderr, "integer");
1139			break;
1140		case BER_TYPE_BITSTRING:
1141			fprintf(stderr, "bit-string");
1142			break;
1143		case BER_TYPE_OCTETSTRING:
1144			fprintf(stderr, "octet-string");
1145			break;
1146		case BER_TYPE_NULL:
1147			fprintf(stderr, "null");
1148			break;
1149		case BER_TYPE_OBJECT:
1150			fprintf(stderr, "object");
1151			break;
1152		case BER_TYPE_ENUMERATED:
1153			fprintf(stderr, "enumerated");
1154			break;
1155		case BER_TYPE_SEQUENCE:
1156			fprintf(stderr, "sequence");
1157			break;
1158		case BER_TYPE_SET:
1159			fprintf(stderr, "set");
1160			break;
1161		}
1162		break;
1163	case BER_CLASS_APPLICATION:
1164		fprintf(stderr, "class: application(%u) type: ",
1165		    root->be_class);
1166		switch (root->be_type) {
1167		case LDAP_REQ_BIND:
1168			fprintf(stderr, "bind");
1169			break;
1170		case LDAP_RES_BIND:
1171			fprintf(stderr, "bind");
1172			break;
1173		case LDAP_REQ_UNBIND_30:
1174			break;
1175		case LDAP_REQ_SEARCH:
1176			fprintf(stderr, "search");
1177			break;
1178		case LDAP_RES_SEARCH_ENTRY:
1179			fprintf(stderr, "search_entry");
1180			break;
1181		case LDAP_RES_SEARCH_RESULT:
1182			fprintf(stderr, "search_result");
1183			break;
1184		case LDAP_REQ_MODIFY:
1185			fprintf(stderr, "modify");
1186			break;
1187		case LDAP_RES_MODIFY:
1188			fprintf(stderr, "modify");
1189			break;
1190		case LDAP_REQ_ADD:
1191			fprintf(stderr, "add");
1192			break;
1193		case LDAP_RES_ADD:
1194			fprintf(stderr, "add");
1195			break;
1196		case LDAP_REQ_DELETE_30:
1197			fprintf(stderr, "delete");
1198			break;
1199		case LDAP_RES_DELETE:
1200			fprintf(stderr, "delete");
1201			break;
1202		case LDAP_REQ_MODRDN:
1203			fprintf(stderr, "modrdn");
1204			break;
1205		case LDAP_RES_MODRDN:
1206			fprintf(stderr, "modrdn");
1207			break;
1208		case LDAP_REQ_COMPARE:
1209			fprintf(stderr, "compare");
1210			break;
1211		case LDAP_RES_COMPARE:
1212			fprintf(stderr, "compare");
1213			break;
1214		case LDAP_REQ_ABANDON_30:
1215			fprintf(stderr, "abandon");
1216			break;
1217		}
1218		break;
1219	case BER_CLASS_PRIVATE:
1220		fprintf(stderr, "class: private(%u) type: ", root->be_class);
1221		fprintf(stderr, "encoding (%u) type: ", root->be_encoding);
1222		break;
1223	case BER_CLASS_CONTEXT:
1224		/* XXX: this is not correct */
1225		fprintf(stderr, "class: context(%u) type: ", root->be_class);
1226		switch(root->be_type) {
1227		case LDAP_AUTH_SIMPLE:
1228			fprintf(stderr, "auth simple");
1229			break;
1230		}
1231		break;
1232	default:
1233		fprintf(stderr, "class: <INVALID>(%u) type: ", root->be_class);
1234		break;
1235	}
1236	fprintf(stderr, "(%u) encoding %u ",
1237	    root->be_type, root->be_encoding);
1238
1239	if (constructed)
1240		root->be_encoding = constructed;
1241
1242	switch (root->be_encoding) {
1243	case BER_TYPE_BOOLEAN:
1244		if (ober_get_boolean(root, &d) == -1) {
1245			fprintf(stderr, "<INVALID>\n");
1246			break;
1247		}
1248		fprintf(stderr, "%s(%d)\n", d ? "true" : "false", d);
1249		break;
1250	case BER_TYPE_INTEGER:
1251		if (ober_get_integer(root, &v) == -1) {
1252			fprintf(stderr, "<INVALID>\n");
1253			break;
1254		}
1255		fprintf(stderr, "value %lld\n", v);
1256		break;
1257	case BER_TYPE_ENUMERATED:
1258		if (ober_get_enumerated(root, &v) == -1) {
1259			fprintf(stderr, "<INVALID>\n");
1260			break;
1261		}
1262		fprintf(stderr, "value %lld\n", v);
1263		break;
1264	case BER_TYPE_BITSTRING:
1265		if (ober_get_bitstring(root, (void *)&buf, &len) == -1) {
1266			fprintf(stderr, "<INVALID>\n");
1267			break;
1268		}
1269		fprintf(stderr, "hexdump ");
1270		for (i = 0; i < len; i++)
1271			fprintf(stderr, "%02x", buf[i]);
1272		fprintf(stderr, "\n");
1273		break;
1274	case BER_TYPE_OBJECT:
1275		if (ober_get_oid(root, &o) == -1) {
1276			fprintf(stderr, "<INVALID>\n");
1277			break;
1278		}
1279		fprintf(stderr, "\n");
1280		break;
1281	case BER_TYPE_OCTETSTRING:
1282		if (ober_get_nstring(root, (void *)&buf, &len) == -1) {
1283			fprintf(stderr, "<INVALID>\n");
1284			break;
1285		}
1286		fprintf(stderr, "string \"%.*s\"\n",  (int)len, buf);
1287		break;
1288	case BER_TYPE_NULL:	/* no payload */
1289	case BER_TYPE_EOC:
1290	case BER_TYPE_SEQUENCE:
1291	case BER_TYPE_SET:
1292	default:
1293		fprintf(stderr, "\n");
1294		break;
1295	}
1296
1297	if (constructed && root->be_sub) {
1298		indent += 2;
1299		ldap_debug_elements(root->be_sub);
1300		indent -= 2;
1301	}
1302	if (root->be_next)
1303		ldap_debug_elements(root->be_next);
1304}
1305#endif
1306
1307/*
1308 * Strip UTF-8 down to ASCII without validation.
1309 * notes:
1310 *	non-ASCII characters are displayed as '?'
1311 *	the argument u should be a NULL terminated sequence of UTF-8 bytes.
1312 */
1313char *
1314utoa(char *u)
1315{
1316	int	 len, i, j;
1317	char	*str;
1318
1319	/* calculate the length to allocate */
1320	for (len = 0, i = 0; u[i] != '\0'; i++)
1321		if (!isu8cont(u[i]))
1322			len++;
1323
1324	if ((str = calloc(len + 1, sizeof(char))) == NULL)
1325		return NULL;
1326
1327	/* copy the ASCII characters to the newly allocated string */
1328	for (i = 0, j = 0; u[i] != '\0'; i++)
1329		if (!isu8cont(u[i]))
1330			str[j++] = isascii((unsigned char)u[i]) ? u[i] : '?';
1331
1332	return str;
1333}
1334
1335static int
1336isu8cont(unsigned char c)
1337{
1338	return (c & (0x80 | 0x40)) == 0x80;
1339}
1340
1341/*
1342 * Parse a LDAP value
1343 * notes:
1344 *	the argument p should be a NUL-terminated sequence of ASCII bytes
1345 */
1346char *
1347parseval(char *p, size_t len)
1348{
1349	char	 hex[3];
1350	char	*buffer;
1351	size_t	 i, j;
1352
1353	if ((buffer = calloc(1, len + 1)) == NULL)
1354		return NULL;
1355
1356	for (i = j = 0; j < len; i++) {
1357		if (p[j] == '\\') {
1358			strlcpy(hex, p + j + 1, sizeof(hex));
1359			buffer[i] = (char)strtoumax(hex, NULL, 16);
1360			j += 3;
1361		} else {
1362			buffer[i] = p[j];
1363			j++;
1364		}
1365	}
1366
1367	return buffer;
1368}
1369
1370int
1371aldap_get_errno(struct aldap *a, const char **estr)
1372{
1373	switch (a->err) {
1374	case ALDAP_ERR_SUCCESS:
1375		*estr = "success";
1376		break;
1377	case ALDAP_ERR_PARSER_ERROR:
1378		*estr = "parser failed";
1379		break;
1380	case ALDAP_ERR_INVALID_FILTER:
1381		*estr = "invalid filter";
1382		break;
1383	case ALDAP_ERR_OPERATION_FAILED:
1384		*estr = "operation failed";
1385		break;
1386	case ALDAP_ERR_TLS_ERROR:
1387		*estr = tls_error(a->tls);
1388		break;
1389	default:
1390		*estr = "unknown";
1391		break;
1392	}
1393	return (a->err);
1394}
1395