1/*	$NetBSD: passwd.c,v 1.1.1.3 2010/12/12 15:22:35 adam Exp $	*/
2
3/* passwd.c - password extended operation routines */
4/* OpenLDAP: pkg/ldap/servers/slapd/passwd.c,v 1.128.2.14 2010/04/13 20:23:17 kurt Exp */
5/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
6 *
7 * Copyright 1998-2010 The OpenLDAP Foundation.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted only as authorized by the OpenLDAP
12 * Public License.
13 *
14 * A copy of this license is available in the file LICENSE in the
15 * top-level directory of the distribution or, alternatively, at
16 * <http://www.OpenLDAP.org/license.html>.
17 */
18
19#include "portable.h"
20
21#include <stdio.h>
22
23#include <ac/socket.h>
24#include <ac/string.h>
25#include <ac/unistd.h>
26
27#ifdef SLAPD_CRYPT
28#include <ac/crypt.h>
29#endif
30
31#include "slap.h"
32
33#include <lber_pvt.h>
34#include <lutil.h>
35#include <lutil_sha1.h>
36
37const struct berval slap_EXOP_MODIFY_PASSWD = BER_BVC(LDAP_EXOP_MODIFY_PASSWD);
38
39static const char *defhash[] = {
40#ifdef LUTIL_SHA1_BYTES
41	"{SSHA}",
42#else
43	"{SMD5}",
44#endif
45	NULL
46};
47
48int passwd_extop(
49	Operation *op,
50	SlapReply *rs )
51{
52	struct berval id = {0, NULL}, hash, *rsp = NULL;
53	req_pwdexop_s *qpw = &op->oq_pwdexop;
54	req_extended_s qext = op->oq_extended;
55	Modifications *ml;
56	slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
57	int i, nhash;
58	char **hashes, idNul;
59	int rc;
60	BackendDB *op_be;
61	int freenewpw = 0;
62	struct berval dn = BER_BVNULL, ndn = BER_BVNULL;
63
64	assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
65
66	if( op->o_dn.bv_len == 0 ) {
67		Statslog( LDAP_DEBUG_STATS, "%s PASSMOD\n",
68			op->o_log_prefix, 0, 0, 0, 0 );
69		rs->sr_text = "only authenticated users may change passwords";
70		return LDAP_STRONG_AUTH_REQUIRED;
71	}
72
73	qpw->rs_old.bv_len = 0;
74	qpw->rs_old.bv_val = NULL;
75	qpw->rs_new.bv_len = 0;
76	qpw->rs_new.bv_val = NULL;
77	qpw->rs_mods = NULL;
78	qpw->rs_modtail = NULL;
79
80	rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id,
81		&qpw->rs_old, &qpw->rs_new, &rs->sr_text );
82
83	if ( !BER_BVISNULL( &id )) {
84		idNul = id.bv_val[id.bv_len];
85		id.bv_val[id.bv_len] = '\0';
86	}
87	if ( rs->sr_err == LDAP_SUCCESS && !BER_BVISEMPTY( &id ) ) {
88		Statslog( LDAP_DEBUG_STATS, "%s PASSMOD id=\"%s\"%s%s\n",
89			op->o_log_prefix, id.bv_val,
90			qpw->rs_old.bv_val ? " old" : "",
91			qpw->rs_new.bv_val ? " new" : "", 0 );
92	} else {
93		Statslog( LDAP_DEBUG_STATS, "%s PASSMOD%s%s\n",
94			op->o_log_prefix,
95			qpw->rs_old.bv_val ? " old" : "",
96			qpw->rs_new.bv_val ? " new" : "", 0, 0 );
97	}
98
99	if ( rs->sr_err != LDAP_SUCCESS ) {
100		if ( !BER_BVISNULL( &id ))
101			id.bv_val[id.bv_len] = idNul;
102		return rs->sr_err;
103	}
104
105	if ( !BER_BVISEMPTY( &id ) ) {
106		rs->sr_err = dnPrettyNormal( NULL, &id, &dn, &ndn, op->o_tmpmemctx );
107		id.bv_val[id.bv_len] = idNul;
108		if ( rs->sr_err != LDAP_SUCCESS ) {
109			rs->sr_text = "Invalid DN";
110			rc = rs->sr_err;
111			goto error_return;
112		}
113		op->o_req_dn = dn;
114		op->o_req_ndn = ndn;
115		op->o_bd = select_backend( &op->o_req_ndn, 1 );
116
117	} else {
118		ber_dupbv_x( &dn, &op->o_dn, op->o_tmpmemctx );
119		ber_dupbv_x( &ndn, &op->o_ndn, op->o_tmpmemctx );
120		op->o_req_dn = dn;
121		op->o_req_ndn = ndn;
122		ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
123		op->o_bd = op->o_conn->c_authz_backend;
124		ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
125	}
126
127	if( op->o_bd == NULL ) {
128		if ( qpw->rs_old.bv_val != NULL ) {
129			rs->sr_text = "unwilling to verify old password";
130			rc = LDAP_UNWILLING_TO_PERFORM;
131			goto error_return;
132		}
133
134#ifdef HAVE_CYRUS_SASL
135		rc = slap_sasl_setpass( op, rs );
136#else
137		rs->sr_text = "no authz backend";
138		rc = LDAP_OTHER;
139#endif
140		goto error_return;
141	}
142
143	if ( op->o_req_ndn.bv_len == 0 ) {
144		rs->sr_text = "no password is associated with the Root DSE";
145		rc = LDAP_UNWILLING_TO_PERFORM;
146		goto error_return;
147	}
148
149	/* If we've got a glued backend, check the real backend */
150	op_be = op->o_bd;
151	if ( SLAP_GLUE_INSTANCE( op->o_bd )) {
152		op->o_bd = select_backend( &op->o_req_ndn, 0 );
153	}
154
155	if (backend_check_restrictions( op, rs,
156			(struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
157		rc = rs->sr_err;
158		goto error_return;
159	}
160
161	/* check for referrals */
162	if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
163		rc = rs->sr_err;
164		goto error_return;
165	}
166
167	/* This does not apply to multi-master case */
168	if(!( !SLAP_SINGLE_SHADOW( op->o_bd ) || be_isupdate( op ))) {
169		/* we SHOULD return a referral in this case */
170		BerVarray defref = op->o_bd->be_update_refs
171			? op->o_bd->be_update_refs : default_referral;
172
173		if( defref != NULL ) {
174			rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
175				NULL, NULL, LDAP_SCOPE_DEFAULT );
176			if(rs->sr_ref) {
177				rs->sr_flags |= REP_REF_MUSTBEFREED;
178			} else {
179				rs->sr_ref = defref;
180			}
181			rc = LDAP_REFERRAL;
182			goto error_return;
183
184		}
185
186		rs->sr_text = "shadow context; no update referral";
187		rc = LDAP_UNWILLING_TO_PERFORM;
188		goto error_return;
189	}
190
191	/* generate a new password if none was provided */
192	if ( qpw->rs_new.bv_len == 0 ) {
193		slap_passwd_generate( &qpw->rs_new );
194		if ( qpw->rs_new.bv_len ) {
195			rsp = slap_passwd_return( &qpw->rs_new );
196			freenewpw = 1;
197		}
198	}
199	if ( qpw->rs_new.bv_len == 0 ) {
200		rs->sr_text = "password generation failed";
201		rc = LDAP_OTHER;
202		goto error_return;
203	}
204
205	op->o_bd = op_be;
206
207	/* Give the backend a chance to handle this itself */
208	if ( op->o_bd->be_extended ) {
209		rs->sr_err = op->o_bd->be_extended( op, rs );
210		if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
211			rs->sr_err != SLAP_CB_CONTINUE )
212		{
213			rc = rs->sr_err;
214			if ( rsp ) {
215				rs->sr_rspdata = rsp;
216				rsp = NULL;
217			}
218			goto error_return;
219		}
220	}
221
222	/* The backend didn't handle it, so try it here */
223	if( op->o_bd && !op->o_bd->be_modify ) {
224		rs->sr_text = "operation not supported for current user";
225		rc = LDAP_UNWILLING_TO_PERFORM;
226		goto error_return;
227	}
228
229	if ( qpw->rs_old.bv_val != NULL ) {
230		Entry *e = NULL;
231
232		rc = be_entry_get_rw( op, &op->o_req_ndn, NULL,
233			slap_schema.si_ad_userPassword, 0, &e );
234		if ( rc == LDAP_SUCCESS && e ) {
235			Attribute *a = attr_find( e->e_attrs,
236				slap_schema.si_ad_userPassword );
237			if ( a )
238				rc = slap_passwd_check( op, e, a, &qpw->rs_old, &rs->sr_text );
239			else
240				rc = 1;
241			be_entry_release_r( op, e );
242			if ( rc == LDAP_SUCCESS )
243				goto old_good;
244		}
245		rs->sr_text = "unwilling to verify old password";
246		rc = LDAP_UNWILLING_TO_PERFORM;
247		goto error_return;
248	}
249
250old_good:
251	ml = ch_malloc( sizeof(Modifications) );
252	if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
253
254	if ( default_passwd_hash ) {
255		for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
256		hashes = default_passwd_hash;
257	} else {
258		nhash = 1;
259		hashes = (char **)defhash;
260	}
261	ml->sml_numvals = nhash;
262	ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
263	for ( i=0; hashes[i]; i++ ) {
264		slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
265		if ( hash.bv_len == 0 ) {
266			if ( !rs->sr_text ) {
267				rs->sr_text = "password hash failed";
268			}
269			break;
270		}
271		ml->sml_values[i] = hash;
272	}
273	ml->sml_values[i].bv_val = NULL;
274	ml->sml_nvalues = NULL;
275	ml->sml_desc = slap_schema.si_ad_userPassword;
276	ml->sml_type = ml->sml_desc->ad_cname;
277	ml->sml_op = LDAP_MOD_REPLACE;
278	ml->sml_flags = 0;
279	ml->sml_next = qpw->rs_mods;
280	qpw->rs_mods = ml;
281
282	if ( hashes[i] ) {
283		rs->sr_err = LDAP_OTHER;
284
285	} else {
286		slap_callback *sc = op->o_callback;
287
288		op->o_tag = LDAP_REQ_MODIFY;
289		op->o_callback = &cb;
290		op->orm_modlist = qpw->rs_mods;
291		op->orm_no_opattrs = 0;
292
293		cb.sc_private = qpw;	/* let Modify know this was pwdMod,
294					 * if it cares... */
295
296		rs->sr_err = op->o_bd->be_modify( op, rs );
297
298		/* be_modify() might have shuffled modifications */
299		qpw->rs_mods = op->orm_modlist;
300
301		if ( rs->sr_err == LDAP_SUCCESS ) {
302			rs->sr_rspdata = rsp;
303
304		} else if ( rsp ) {
305			ber_bvfree( rsp );
306			rsp = NULL;
307		}
308		op->o_tag = LDAP_REQ_EXTENDED;
309		op->o_callback = sc;
310	}
311
312	rc = rs->sr_err;
313	op->oq_extended = qext;
314
315error_return:;
316	if ( qpw->rs_mods ) {
317		slap_mods_free( qpw->rs_mods, 1 );
318	}
319	if ( freenewpw ) {
320		free( qpw->rs_new.bv_val );
321	}
322	if ( !BER_BVISNULL( &dn ) ) {
323		op->o_tmpfree( dn.bv_val, op->o_tmpmemctx );
324		BER_BVZERO( &op->o_req_dn );
325	}
326	if ( !BER_BVISNULL( &ndn ) ) {
327		op->o_tmpfree( ndn.bv_val, op->o_tmpmemctx );
328		BER_BVZERO( &op->o_req_ndn );
329	}
330
331	return rc;
332}
333
334/* NOTE: The DN in *id is NOT NUL-terminated here. dnNormalize will
335 * reject it in this condition, the caller must NUL-terminate it.
336 * FIXME: should dnNormalize still be complaining about that?
337 */
338int slap_passwd_parse( struct berval *reqdata,
339	struct berval *id,
340	struct berval *oldpass,
341	struct berval *newpass,
342	const char **text )
343{
344	int rc = LDAP_SUCCESS;
345	ber_tag_t tag;
346	ber_len_t len = -1;
347	BerElementBuffer berbuf;
348	BerElement *ber = (BerElement *)&berbuf;
349
350	if( reqdata == NULL ) {
351		return LDAP_SUCCESS;
352	}
353
354	if( reqdata->bv_len == 0 ) {
355		*text = "empty request data field";
356		return LDAP_PROTOCOL_ERROR;
357	}
358
359	/* ber_init2 uses reqdata directly, doesn't allocate new buffers */
360	ber_init2( ber, reqdata, 0 );
361
362	tag = ber_skip_tag( ber, &len );
363
364	if( tag != LBER_SEQUENCE ) {
365		Debug( LDAP_DEBUG_TRACE,
366			"slap_passwd_parse: decoding error\n", 0, 0, 0 );
367		rc = LDAP_PROTOCOL_ERROR;
368		goto done;
369	}
370
371	tag = ber_peek_tag( ber, &len );
372	if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
373		if( id == NULL ) {
374			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
375				0, 0, 0 );
376
377			*text = "user must change own password";
378			rc = LDAP_UNWILLING_TO_PERFORM;
379			goto done;
380		}
381
382		tag = ber_get_stringbv( ber, id, LBER_BV_NOTERM );
383
384		if( tag == LBER_ERROR ) {
385			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
386				0, 0, 0 );
387
388			goto decoding_error;
389		}
390
391		tag = ber_peek_tag( ber, &len );
392	}
393
394	if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
395		if( oldpass == NULL ) {
396			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
397				0, 0, 0 );
398
399			*text = "use bind to verify old password";
400			rc = LDAP_UNWILLING_TO_PERFORM;
401			goto done;
402		}
403
404		tag = ber_get_stringbv( ber, oldpass, LBER_BV_NOTERM );
405
406		if( tag == LBER_ERROR ) {
407			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
408				0, 0, 0 );
409
410			goto decoding_error;
411		}
412
413		if( oldpass->bv_len == 0 ) {
414			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n",
415				0, 0, 0 );
416
417			*text = "old password value is empty";
418			rc = LDAP_UNWILLING_TO_PERFORM;
419			goto done;
420		}
421
422		tag = ber_peek_tag( ber, &len );
423	}
424
425	if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
426		if( newpass == NULL ) {
427			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
428				0, 0, 0 );
429
430			*text = "user specified passwords disallowed";
431			rc = LDAP_UNWILLING_TO_PERFORM;
432			goto done;
433		}
434
435		tag = ber_get_stringbv( ber, newpass, LBER_BV_NOTERM );
436
437		if( tag == LBER_ERROR ) {
438			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
439				0, 0, 0 );
440
441			goto decoding_error;
442		}
443
444		if( newpass->bv_len == 0 ) {
445			Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n",
446				0, 0, 0 );
447
448			*text = "new password value is empty";
449			rc = LDAP_UNWILLING_TO_PERFORM;
450			goto done;
451		}
452
453		tag = ber_peek_tag( ber, &len );
454	}
455
456	if( len != 0 ) {
457decoding_error:
458		Debug( LDAP_DEBUG_TRACE,
459			"slap_passwd_parse: decoding error, len=%ld\n",
460			(long) len, 0, 0 );
461
462		*text = "data decoding error";
463		rc = LDAP_PROTOCOL_ERROR;
464	}
465
466done:
467	return rc;
468}
469
470struct berval * slap_passwd_return(
471	struct berval		*cred )
472{
473	int rc;
474	struct berval *bv = NULL;
475	BerElementBuffer berbuf;
476	/* opaque structure, size unknown but smaller than berbuf */
477	BerElement *ber = (BerElement *)&berbuf;
478
479	assert( cred != NULL );
480
481	Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
482		(long) cred->bv_len, 0, 0 );
483
484	ber_init_w_nullc( ber, LBER_USE_DER );
485
486	rc = ber_printf( ber, "{tON}",
487		LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
488
489	if( rc >= 0 ) {
490		(void) ber_flatten( ber, &bv );
491	}
492
493	ber_free_buf( ber );
494
495	return bv;
496}
497
498/*
499 * if "e" is provided, access to each value of the password is checked first
500 */
501int
502slap_passwd_check(
503	Operation	*op,
504	Entry		*e,
505	Attribute	*a,
506	struct berval	*cred,
507	const char	**text )
508{
509	int			result = 1;
510	struct berval		*bv;
511	AccessControlState	acl_state = ACL_STATE_INIT;
512	char		credNul = cred->bv_val[cred->bv_len];
513
514#ifdef SLAPD_SPASSWD
515	void		*old_authctx = NULL;
516
517	ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind,
518		op->o_conn->c_sasl_authctx, 0, &old_authctx, NULL );
519#endif
520
521	if ( credNul ) cred->bv_val[cred->bv_len] = 0;
522
523	for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
524		/* if e is provided, check access */
525		if ( e && access_allowed( op, e, a->a_desc, bv,
526					ACL_AUTH, &acl_state ) == 0 )
527		{
528			continue;
529		}
530
531		if ( !lutil_passwd( bv, cred, NULL, text ) ) {
532			result = 0;
533			break;
534		}
535	}
536
537	if ( credNul ) cred->bv_val[cred->bv_len] = credNul;
538
539#ifdef SLAPD_SPASSWD
540	ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind,
541		old_authctx, 0, NULL, NULL );
542#endif
543
544	return result;
545}
546
547void
548slap_passwd_generate( struct berval *pass )
549{
550	Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
551	BER_BVZERO( pass );
552
553	/*
554	 * generate passwords of only 8 characters as some getpass(3)
555	 * implementations truncate at 8 characters.
556	 */
557	lutil_passwd_generate( pass, 8 );
558}
559
560void
561slap_passwd_hash_type(
562	struct berval * cred,
563	struct berval * new,
564	char *hash,
565	const char **text )
566{
567	new->bv_len = 0;
568	new->bv_val = NULL;
569
570	assert( hash != NULL );
571
572	lutil_passwd_hash( cred , hash, new, text );
573}
574void
575slap_passwd_hash(
576	struct berval * cred,
577	struct berval * new,
578	const char **text )
579{
580	char *hash = NULL;
581	if ( default_passwd_hash ) {
582		hash = default_passwd_hash[0];
583	}
584	if ( !hash ) {
585		hash = (char *)defhash[0];
586	}
587
588	slap_passwd_hash_type( cred, new, hash, text );
589}
590
591#ifdef SLAPD_CRYPT
592static ldap_pvt_thread_mutex_t passwd_mutex;
593static lutil_cryptfunc slapd_crypt;
594
595static int slapd_crypt( const char *key, const char *salt, char **hash )
596{
597	char *cr;
598	int rc;
599
600	ldap_pvt_thread_mutex_lock( &passwd_mutex );
601
602	cr = crypt( key, salt );
603	if ( cr == NULL || cr[0] == '\0' ) {
604		/* salt must have been invalid */
605		rc = LUTIL_PASSWD_ERR;
606	} else {
607		if ( hash ) {
608			*hash = ber_strdup( cr );
609			rc = LUTIL_PASSWD_OK;
610
611		} else {
612			rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
613		}
614	}
615
616	ldap_pvt_thread_mutex_unlock( &passwd_mutex );
617	return rc;
618}
619#endif /* SLAPD_CRYPT */
620
621void slap_passwd_init()
622{
623#ifdef SLAPD_CRYPT
624	ldap_pvt_thread_mutex_init( &passwd_mutex );
625	lutil_cryptptr = slapd_crypt;
626#endif
627}
628
629