1 /* $NetBSD: passwd.c,v 1.3 2021/08/14 16:14:58 christos Exp $ */
2
3 /* passwd.c - password extended operation routines */
4 /* $OpenLDAP$ */
5 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
6 *
7 * Copyright 1998-2021 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 <sys/cdefs.h>
20 __RCSID("$NetBSD: passwd.c,v 1.3 2021/08/14 16:14:58 christos Exp $");
21
22 #include "portable.h"
23
24 #include <stdio.h>
25
26 #include <ac/socket.h>
27 #include <ac/string.h>
28 #include <ac/unistd.h>
29
30 #ifdef SLAPD_CRYPT
31 #ifdef HAVE_CRYPT_R
32 #define __USE_GNU
33 #endif /* HAVE_CRYPT_R */
34 #include <ac/crypt.h>
35 #endif /* SLAPD_CRYPT */
36
37 #include "slap.h"
38
39 #include <lber_pvt.h>
40 #include <lutil.h>
41 #include <lutil_sha1.h>
42
43 const struct berval slap_EXOP_MODIFY_PASSWD = BER_BVC(LDAP_EXOP_MODIFY_PASSWD);
44
45 static const char *defhash[] = {
46 #ifdef LUTIL_SHA1_BYTES
47 "{SSHA}",
48 #else
49 "{SMD5}",
50 #endif
51 NULL
52 };
53
passwd_extop(Operation * op,SlapReply * rs)54 int passwd_extop(
55 Operation *op,
56 SlapReply *rs )
57 {
58 struct berval id = {0, NULL}, hash, *rsp = NULL;
59 req_pwdexop_s *qpw = &op->oq_pwdexop;
60 req_extended_s qext = op->oq_extended;
61 Modifications *ml;
62 slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
63 int i, nhash;
64 char **hashes, idNul;
65 int rc;
66 BackendDB *op_be;
67 int freenewpw = 0;
68 struct berval dn = BER_BVNULL, ndn = BER_BVNULL;
69
70 assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
71
72 if( op->o_dn.bv_len == 0 ) {
73 Debug( LDAP_DEBUG_STATS, "%s PASSMOD\n",
74 op->o_log_prefix );
75 rs->sr_text = "only authenticated users may change passwords";
76 return LDAP_STRONG_AUTH_REQUIRED;
77 }
78
79 qpw->rs_old.bv_len = 0;
80 qpw->rs_old.bv_val = NULL;
81 qpw->rs_new.bv_len = 0;
82 qpw->rs_new.bv_val = NULL;
83 qpw->rs_mods = NULL;
84 qpw->rs_modtail = NULL;
85
86 rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id,
87 &qpw->rs_old, &qpw->rs_new, &rs->sr_text );
88
89 if ( !BER_BVISNULL( &id )) {
90 idNul = id.bv_val[id.bv_len];
91 id.bv_val[id.bv_len] = '\0';
92 }
93 if ( rs->sr_err == LDAP_SUCCESS && !BER_BVISEMPTY( &id ) ) {
94 Debug( LDAP_DEBUG_STATS, "%s PASSMOD id=\"%s\"%s%s\n",
95 op->o_log_prefix, id.bv_val,
96 qpw->rs_old.bv_val ? " old" : "",
97 qpw->rs_new.bv_val ? " new" : "" );
98 } else {
99 Debug( LDAP_DEBUG_STATS, "%s PASSMOD%s%s\n",
100 op->o_log_prefix,
101 qpw->rs_old.bv_val ? " old" : "",
102 qpw->rs_new.bv_val ? " new" : "" );
103 }
104
105 if ( rs->sr_err != LDAP_SUCCESS ) {
106 if ( !BER_BVISNULL( &id ))
107 id.bv_val[id.bv_len] = idNul;
108 return rs->sr_err;
109 }
110
111 if ( !BER_BVISEMPTY( &id ) ) {
112 rs->sr_err = dnPrettyNormal( NULL, &id, &dn, &ndn, op->o_tmpmemctx );
113 id.bv_val[id.bv_len] = idNul;
114 if ( rs->sr_err != LDAP_SUCCESS ) {
115 rs->sr_text = "Invalid DN";
116 rc = rs->sr_err;
117 goto error_return;
118 }
119 op->o_req_dn = dn;
120 op->o_req_ndn = ndn;
121 op->o_bd = select_backend( &op->o_req_ndn, 1 );
122
123 } else {
124 ber_dupbv_x( &dn, &op->o_dn, op->o_tmpmemctx );
125 ber_dupbv_x( &ndn, &op->o_ndn, op->o_tmpmemctx );
126 op->o_req_dn = dn;
127 op->o_req_ndn = ndn;
128 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
129 op->o_bd = op->o_conn->c_authz_backend;
130 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
131 }
132
133 if( op->o_bd == NULL ) {
134 if ( qpw->rs_old.bv_val != NULL ) {
135 rs->sr_text = "unwilling to verify old password";
136 rc = LDAP_UNWILLING_TO_PERFORM;
137 goto error_return;
138 }
139
140 #ifdef HAVE_CYRUS_SASL
141 rc = slap_sasl_setpass( op, rs );
142 #else
143 rs->sr_text = "no authz backend";
144 rc = LDAP_OTHER;
145 #endif
146 goto error_return;
147 }
148
149 if ( op->o_req_ndn.bv_len == 0 ) {
150 rs->sr_text = "no password is associated with the Root DSE";
151 rc = LDAP_UNWILLING_TO_PERFORM;
152 goto error_return;
153 }
154
155 /* If we've got a glued backend, check the real backend */
156 op_be = op->o_bd;
157 if ( SLAP_GLUE_INSTANCE( op->o_bd )) {
158 op->o_bd = select_backend( &op->o_req_ndn, 0 );
159 }
160
161 if (backend_check_restrictions( op, rs,
162 (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
163 rc = rs->sr_err;
164 goto error_return;
165 }
166
167 /* check for referrals */
168 if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
169 rc = rs->sr_err;
170 goto error_return;
171 }
172
173 /* This does not apply to multi-provider case */
174 if(!( !SLAP_SINGLE_SHADOW( op->o_bd ) || be_isupdate( op ))) {
175 /* we SHOULD return a referral in this case */
176 BerVarray defref = op->o_bd->be_update_refs
177 ? op->o_bd->be_update_refs : default_referral;
178
179 if( defref != NULL ) {
180 rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
181 NULL, NULL, LDAP_SCOPE_DEFAULT );
182 if(rs->sr_ref) {
183 rs->sr_flags |= REP_REF_MUSTBEFREED;
184 } else {
185 rs->sr_ref = defref;
186 }
187 rc = LDAP_REFERRAL;
188 goto error_return;
189
190 }
191
192 rs->sr_text = "shadow context; no update referral";
193 rc = LDAP_UNWILLING_TO_PERFORM;
194 goto error_return;
195 }
196
197 /* generate a new password if none was provided */
198 if ( qpw->rs_new.bv_len == 0 ) {
199 slap_passwd_generate( &qpw->rs_new );
200 if ( qpw->rs_new.bv_len ) {
201 rsp = slap_passwd_return( &qpw->rs_new );
202 freenewpw = 1;
203 }
204 }
205 if ( qpw->rs_new.bv_len == 0 ) {
206 rs->sr_text = "password generation failed";
207 rc = LDAP_OTHER;
208 goto error_return;
209 }
210
211 if ( op->o_txnSpec ) {
212 rc = txn_preop( op, rs );
213 goto error_return;
214 }
215
216 op->o_bd = op_be;
217
218 /* Give the backend a chance to handle this itself */
219 if ( op->o_bd->be_extended ) {
220 rs->sr_err = op->o_bd->be_extended( op, rs );
221 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
222 rs->sr_err != SLAP_CB_CONTINUE )
223 {
224 rc = rs->sr_err;
225 if ( rsp ) {
226 rs->sr_rspdata = rsp;
227 rsp = NULL;
228 }
229 goto error_return;
230 }
231 }
232
233 /* The backend didn't handle it, so try it here */
234 if( op->o_bd && !op->o_bd->be_modify ) {
235 rs->sr_text = "operation not supported for current user";
236 rc = LDAP_UNWILLING_TO_PERFORM;
237 goto error_return;
238 }
239
240 if ( qpw->rs_old.bv_val != NULL ) {
241 Entry *e = NULL;
242
243 rc = be_entry_get_rw( op, &op->o_req_ndn, NULL,
244 slap_schema.si_ad_userPassword, 0, &e );
245 if ( rc == LDAP_SUCCESS && e ) {
246 Attribute *a = attr_find( e->e_attrs,
247 slap_schema.si_ad_userPassword );
248 if ( a )
249 rc = slap_passwd_check( op, e, a, &qpw->rs_old, &rs->sr_text );
250 else
251 rc = 1;
252 be_entry_release_r( op, e );
253 if ( rc == LDAP_SUCCESS )
254 goto old_good;
255 }
256 rs->sr_text = "unwilling to verify old password";
257 rc = LDAP_UNWILLING_TO_PERFORM;
258 goto error_return;
259 }
260
261 old_good:
262 ml = ch_malloc( sizeof(Modifications) );
263 if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
264
265 if ( default_passwd_hash ) {
266 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
267 hashes = default_passwd_hash;
268 } else {
269 nhash = 1;
270 hashes = (char **)defhash;
271 }
272 ml->sml_numvals = nhash;
273 ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
274 for ( i=0; hashes[i]; i++ ) {
275 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
276 if ( hash.bv_len == 0 ) {
277 if ( !rs->sr_text ) {
278 rs->sr_text = "password hash failed";
279 }
280 break;
281 }
282 ml->sml_values[i] = hash;
283 }
284 ml->sml_values[i].bv_val = NULL;
285 ml->sml_nvalues = NULL;
286 ml->sml_desc = slap_schema.si_ad_userPassword;
287 ml->sml_type = ml->sml_desc->ad_cname;
288 ml->sml_op = LDAP_MOD_REPLACE;
289 ml->sml_flags = 0;
290 ml->sml_next = qpw->rs_mods;
291 qpw->rs_mods = ml;
292
293 if ( hashes[i] ) {
294 rs->sr_err = LDAP_OTHER;
295
296 } else {
297 slap_callback **sc;
298
299 op->o_tag = LDAP_REQ_MODIFY;
300 op->o_callback = &cb;
301 op->orm_modlist = qpw->rs_mods;
302 op->orm_no_opattrs = 0;
303
304 cb.sc_private = qpw; /* let Modify know this was pwdMod,
305 * if it cares... */
306
307 rs->sr_err = op->o_bd->be_modify( op, rs );
308
309 /* be_modify() might have shuffled modifications */
310 qpw->rs_mods = op->orm_modlist;
311
312 if ( rs->sr_err == LDAP_SUCCESS ) {
313 rs->sr_rspdata = rsp;
314
315 } else if ( rsp ) {
316 ber_bvfree( rsp );
317 rsp = NULL;
318 }
319 op->o_tag = LDAP_REQ_EXTENDED;
320 for ( sc = &op->o_callback; *sc; sc = &(*sc)->sc_next ) {
321 if ( *sc == &cb ) {
322 *sc = cb.sc_next;
323 break;
324 }
325 }
326 }
327
328 rc = rs->sr_err;
329 op->oq_extended = qext;
330
331 error_return:;
332 if ( qpw->rs_mods ) {
333 slap_mods_free( qpw->rs_mods, 1 );
334 }
335 if ( freenewpw ) {
336 free( qpw->rs_new.bv_val );
337 }
338 if ( !BER_BVISNULL( &dn ) ) {
339 op->o_tmpfree( dn.bv_val, op->o_tmpmemctx );
340 BER_BVZERO( &op->o_req_dn );
341 }
342 if ( !BER_BVISNULL( &ndn ) ) {
343 op->o_tmpfree( ndn.bv_val, op->o_tmpmemctx );
344 BER_BVZERO( &op->o_req_ndn );
345 }
346
347 return rc;
348 }
349
350 /* NOTE: The DN in *id is NOT NUL-terminated here. dnNormalize will
351 * reject it in this condition, the caller must NUL-terminate it.
352 * FIXME: should dnNormalize still be complaining about that?
353 */
slap_passwd_parse(struct berval * reqdata,struct berval * id,struct berval * oldpass,struct berval * newpass,const char ** text)354 int slap_passwd_parse( struct berval *reqdata,
355 struct berval *id,
356 struct berval *oldpass,
357 struct berval *newpass,
358 const char **text )
359 {
360 int rc = LDAP_SUCCESS;
361 ber_tag_t tag;
362 ber_len_t len = -1;
363 BerElementBuffer berbuf;
364 BerElement *ber = (BerElement *)&berbuf;
365
366 if( reqdata == NULL ) {
367 return LDAP_SUCCESS;
368 }
369
370 if( reqdata->bv_len == 0 ) {
371 *text = "empty request data field";
372 return LDAP_PROTOCOL_ERROR;
373 }
374
375 /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
376 ber_init2( ber, reqdata, 0 );
377
378 tag = ber_skip_tag( ber, &len );
379
380 if( tag != LBER_SEQUENCE ) {
381 Debug( LDAP_DEBUG_TRACE,
382 "slap_passwd_parse: decoding error\n" );
383 rc = LDAP_PROTOCOL_ERROR;
384 goto done;
385 }
386
387 tag = ber_peek_tag( ber, &len );
388 if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
389 if( id == NULL ) {
390 Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n" );
391
392 *text = "user must change own password";
393 rc = LDAP_UNWILLING_TO_PERFORM;
394 goto done;
395 }
396
397 tag = ber_get_stringbv( ber, id, LBER_BV_NOTERM );
398
399 if( tag == LBER_ERROR ) {
400 Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n" );
401
402 goto decoding_error;
403 }
404
405 tag = ber_peek_tag( ber, &len );
406 }
407
408 if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
409 if( oldpass == NULL ) {
410 Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n" );
411
412 *text = "use bind to verify old password";
413 rc = LDAP_UNWILLING_TO_PERFORM;
414 goto done;
415 }
416
417 tag = ber_get_stringbv( ber, oldpass, LBER_BV_NOTERM );
418
419 if( tag == LBER_ERROR ) {
420 Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n" );
421
422 goto decoding_error;
423 }
424
425 if( oldpass->bv_len == 0 ) {
426 Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n" );
427
428 *text = "old password value is empty";
429 rc = LDAP_UNWILLING_TO_PERFORM;
430 goto done;
431 }
432
433 tag = ber_peek_tag( ber, &len );
434 }
435
436 if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
437 if( newpass == NULL ) {
438 Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n" );
439
440 *text = "user specified passwords disallowed";
441 rc = LDAP_UNWILLING_TO_PERFORM;
442 goto done;
443 }
444
445 tag = ber_get_stringbv( ber, newpass, LBER_BV_NOTERM );
446
447 if( tag == LBER_ERROR ) {
448 Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n" );
449
450 goto decoding_error;
451 }
452
453 if( newpass->bv_len == 0 ) {
454 Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n" );
455
456 *text = "new password value is empty";
457 rc = LDAP_UNWILLING_TO_PERFORM;
458 goto done;
459 }
460
461 tag = ber_peek_tag( ber, &len );
462 }
463
464 if( len != 0 ) {
465 decoding_error:
466 Debug( LDAP_DEBUG_TRACE,
467 "slap_passwd_parse: decoding error, len=%ld\n",
468 (long) len );
469
470 *text = "data decoding error";
471 rc = LDAP_PROTOCOL_ERROR;
472 }
473
474 done:
475 return rc;
476 }
477
slap_passwd_return(struct berval * cred)478 struct berval * slap_passwd_return(
479 struct berval *cred )
480 {
481 int rc;
482 struct berval *bv = NULL;
483 BerElementBuffer berbuf;
484 /* opaque structure, size unknown but smaller than berbuf */
485 BerElement *ber = (BerElement *)&berbuf;
486
487 assert( cred != NULL );
488
489 Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
490 (long) cred->bv_len );
491
492 ber_init_w_nullc( ber, LBER_USE_DER );
493
494 rc = ber_printf( ber, "{tON}",
495 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
496
497 if( rc >= 0 ) {
498 (void) ber_flatten( ber, &bv );
499 }
500
501 ber_free_buf( ber );
502
503 return bv;
504 }
505
506 /*
507 * if "e" is provided, access to each value of the password is checked first
508 */
509 int
slap_passwd_check(Operation * op,Entry * e,Attribute * a,struct berval * cred,const char ** text)510 slap_passwd_check(
511 Operation *op,
512 Entry *e,
513 Attribute *a,
514 struct berval *cred,
515 const char **text )
516 {
517 int result = 1;
518 struct berval *bv;
519 AccessControlState acl_state = ACL_STATE_INIT;
520 char credNul = cred->bv_val[cred->bv_len];
521
522 #ifdef SLAPD_SPASSWD
523 void *old_authctx = NULL;
524
525 ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind,
526 op->o_conn->c_sasl_authctx, 0, &old_authctx, NULL );
527 #endif
528
529 if ( credNul ) cred->bv_val[cred->bv_len] = 0;
530
531 for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
532 /* if e is provided, check access */
533 if ( e && access_allowed( op, e, a->a_desc, bv,
534 ACL_AUTH, &acl_state ) == 0 )
535 {
536 continue;
537 }
538
539 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
540 result = 0;
541 break;
542 }
543 }
544
545 if ( credNul ) cred->bv_val[cred->bv_len] = credNul;
546
547 #ifdef SLAPD_SPASSWD
548 ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind,
549 old_authctx, 0, NULL, NULL );
550 #endif
551
552 return result;
553 }
554
555 void
slap_passwd_generate(struct berval * pass)556 slap_passwd_generate( struct berval *pass )
557 {
558 Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n" );
559 BER_BVZERO( pass );
560
561 /*
562 * generate passwords of only 8 characters as some getpass(3)
563 * implementations truncate at 8 characters.
564 */
565 lutil_passwd_generate( pass, 8 );
566 }
567
568 void
slap_passwd_hash_type(struct berval * cred,struct berval * new,char * hash,const char ** text)569 slap_passwd_hash_type(
570 struct berval * cred,
571 struct berval * new,
572 char *hash,
573 const char **text )
574 {
575 new->bv_len = 0;
576 new->bv_val = NULL;
577
578 assert( hash != NULL );
579
580 lutil_passwd_hash( cred , hash, new, text );
581 }
582 void
slap_passwd_hash(struct berval * cred,struct berval * new,const char ** text)583 slap_passwd_hash(
584 struct berval * cred,
585 struct berval * new,
586 const char **text )
587 {
588 char *hash = NULL;
589 if ( default_passwd_hash ) {
590 hash = default_passwd_hash[0];
591 }
592 if ( !hash ) {
593 hash = (char *)defhash[0];
594 }
595
596 slap_passwd_hash_type( cred, new, hash, text );
597 }
598
599 #ifdef SLAPD_CRYPT
600 static ldap_pvt_thread_mutex_t passwd_mutex;
601 static lutil_cryptfunc slapd_crypt;
602
603 #ifdef HAVE_CRYPT_R
slapd_crypt(const char * key,const char * salt,char ** hash)604 static int slapd_crypt( const char *key, const char *salt, char **hash )
605 {
606 char *cr;
607 int rc;
608 struct crypt_data data;
609
610 data.initialized = 0;
611 cr = crypt_r( key, salt, &data );
612 if ( cr == NULL || cr[0] == '\0' ) {
613 /* salt must have been invalid */
614 rc = LUTIL_PASSWD_ERR;
615 } else {
616 if ( hash ) {
617 *hash = ber_strdup( cr );
618 rc = LUTIL_PASSWD_OK;
619 } else {
620 rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
621 }
622 }
623
624 return rc;
625 }
626 #else
slapd_crypt(const char * key,const char * salt,char ** hash)627 static int slapd_crypt( const char *key, const char *salt, char **hash )
628 {
629 char *cr;
630 int rc;
631
632 ldap_pvt_thread_mutex_lock( &passwd_mutex );
633
634 cr = crypt( key, salt );
635 if ( cr == NULL || cr[0] == '\0' ) {
636 /* salt must have been invalid */
637 rc = LUTIL_PASSWD_ERR;
638 } else {
639 if ( hash ) {
640 *hash = ber_strdup( cr );
641 rc = LUTIL_PASSWD_OK;
642
643 } else {
644 rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
645 }
646 }
647
648 ldap_pvt_thread_mutex_unlock( &passwd_mutex );
649 return rc;
650 }
651 #endif /* HAVE_CRYPT_R */
652
653 #endif /* SLAPD_CRYPT */
654
slap_passwd_init()655 void slap_passwd_init()
656 {
657 #ifdef SLAPD_CRYPT
658 ldap_pvt_thread_mutex_init( &passwd_mutex );
659 lutil_cryptptr = slapd_crypt;
660 #endif
661 }
662
663