git.sur5r.net Git - openldap/blob - servers/slapd/passwd.c

   1 /* passwd.c - password extended operation routines */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 1998-2017 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16
  17 #include "portable.h"
  18
  19 #include <stdio.h>
  20
  21 #include <ac/socket.h>
  22 #include <ac/string.h>
  23 #include <ac/unistd.h>
  24
  25 #ifdef SLAPD_CRYPT
  26 #include <ac/crypt.h>
  27 #endif
  28
  29 #include "slap.h"
  30
  31 #include <lber_pvt.h>
  32 #include <lutil.h>
  33 #include <lutil_sha1.h>
  34
  35 const struct berval slap_EXOP_MODIFY_PASSWD = BER_BVC(LDAP_EXOP_MODIFY_PASSWD);
  36
  37 static const char *defhash[] = {
  38 #ifdef LUTIL_SHA1_BYTES
  39         "{SSHA}",
  40 #else
  41         "{SMD5}",
  42 #endif
  43         NULL
  44 };
  45
  46 int passwd_extop(
  47         Operation *op,
  48         SlapReply *rs )
  49 {
  50         struct berval id = {0, NULL}, hash, *rsp = NULL;
  51         req_pwdexop_s *qpw = &op->oq_pwdexop;
  52         req_extended_s qext = op->oq_extended;
  53         Modifications *ml;
  54         slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
  55         int i, nhash;
  56         char **hashes, idNul;
  57         int rc;
  58         BackendDB *op_be;
  59         int freenewpw = 0;
  60         struct berval dn = BER_BVNULL, ndn = BER_BVNULL;
  61
  62         assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
  63
  64         if( op->o_dn.bv_len == 0 ) {
  65                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD\n",
  66                         op->o_log_prefix, 0, 0, 0, 0 );
  67                 rs->sr_text = "only authenticated users may change passwords";
  68                 return LDAP_STRONG_AUTH_REQUIRED;
  69         }
  70
  71         qpw->rs_old.bv_len = 0;
  72         qpw->rs_old.bv_val = NULL;
  73         qpw->rs_new.bv_len = 0;
  74         qpw->rs_new.bv_val = NULL;
  75         qpw->rs_mods = NULL;
  76         qpw->rs_modtail = NULL;
  77
  78         rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id,
  79                 &qpw->rs_old, &qpw->rs_new, &rs->sr_text );
  80
  81         if ( !BER_BVISNULL( &id )) {
  82                 idNul = id.bv_val[id.bv_len];
  83                 id.bv_val[id.bv_len] = '\0';
  84         }
  85         if ( rs->sr_err == LDAP_SUCCESS && !BER_BVISEMPTY( &id ) ) {
  86                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD id=\"%s\"%s%s\n",
  87                         op->o_log_prefix, id.bv_val,
  88                         qpw->rs_old.bv_val ? " old" : "",
  89                         qpw->rs_new.bv_val ? " new" : "", 0 );
  90         } else {
  91                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD%s%s\n",
  92                         op->o_log_prefix,
  93                         qpw->rs_old.bv_val ? " old" : "",
  94                         qpw->rs_new.bv_val ? " new" : "", 0, 0 );
  95         }
  96
  97         if ( rs->sr_err != LDAP_SUCCESS ) {
  98                 if ( !BER_BVISNULL( &id ))
  99                         id.bv_val[id.bv_len] = idNul;
 100                 return rs->sr_err;
 101         }
 102
 103         if ( !BER_BVISEMPTY( &id ) ) {
 104                 rs->sr_err = dnPrettyNormal( NULL, &id, &dn, &ndn, op->o_tmpmemctx );
 105                 id.bv_val[id.bv_len] = idNul;
 106                 if ( rs->sr_err != LDAP_SUCCESS ) {
 107                         rs->sr_text = "Invalid DN";
 108                         rc = rs->sr_err;
 109                         goto error_return;
 110                 }
 111                 op->o_req_dn = dn;
 112                 op->o_req_ndn = ndn;
 113                 op->o_bd = select_backend( &op->o_req_ndn, 1 );
 114
 115         } else {
 116                 ber_dupbv_x( &dn, &op->o_dn, op->o_tmpmemctx );
 117                 ber_dupbv_x( &ndn, &op->o_ndn, op->o_tmpmemctx );
 118                 op->o_req_dn = dn;
 119                 op->o_req_ndn = ndn;
 120                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 121                 op->o_bd = op->o_conn->c_authz_backend;
 122                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 123         }
 124
 125         if( op->o_bd == NULL ) {
 126                 if ( qpw->rs_old.bv_val != NULL ) {
 127                         rs->sr_text = "unwilling to verify old password";
 128                         rc = LDAP_UNWILLING_TO_PERFORM;
 129                         goto error_return;
 130                 }
 131
 132 #ifdef HAVE_CYRUS_SASL
 133                 rc = slap_sasl_setpass( op, rs );
 134 #else
 135                 rs->sr_text = "no authz backend";
 136                 rc = LDAP_OTHER;
 137 #endif
 138                 goto error_return;
 139         }
 140
 141         if ( op->o_req_ndn.bv_len == 0 ) {
 142                 rs->sr_text = "no password is associated with the Root DSE";
 143                 rc = LDAP_UNWILLING_TO_PERFORM;
 144                 goto error_return;
 145         }
 146
 147         /* If we've got a glued backend, check the real backend */
 148         op_be = op->o_bd;
 149         if ( SLAP_GLUE_INSTANCE( op->o_bd )) {
 150                 op->o_bd = select_backend( &op->o_req_ndn, 0 );
 151         }
 152
 153         if (backend_check_restrictions( op, rs,
 154                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 155                 rc = rs->sr_err;
 156                 goto error_return;
 157         }
 158
 159         /* check for referrals */
 160         if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 161                 rc = rs->sr_err;
 162                 goto error_return;
 163         }
 164
 165         /* This does not apply to multi-master case */
 166         if(!( !SLAP_SINGLE_SHADOW( op->o_bd ) || be_isupdate( op ))) {
 167                 /* we SHOULD return a referral in this case */
 168                 BerVarray defref = op->o_bd->be_update_refs
 169                         ? op->o_bd->be_update_refs : default_referral;
 170
 171                 if( defref != NULL ) {
 172                         rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
 173                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 174                         if(rs->sr_ref) {
 175                                 rs->sr_flags |= REP_REF_MUSTBEFREED;
 176                         } else {
 177                                 rs->sr_ref = defref;
 178                         }
 179                         rc = LDAP_REFERRAL;
 180                         goto error_return;
 181
 182                 }
 183
 184                 rs->sr_text = "shadow context; no update referral";
 185                 rc = LDAP_UNWILLING_TO_PERFORM;
 186                 goto error_return;
 187         }
 188
 189         /* generate a new password if none was provided */
 190         if ( qpw->rs_new.bv_len == 0 ) {
 191                 slap_passwd_generate( &qpw->rs_new );
 192                 if ( qpw->rs_new.bv_len ) {
 193                         rsp = slap_passwd_return( &qpw->rs_new );
 194                         freenewpw = 1;
 195                 }
 196         }
 197         if ( qpw->rs_new.bv_len == 0 ) {
 198                 rs->sr_text = "password generation failed";
 199                 rc = LDAP_OTHER;
 200                 goto error_return;
 201         }
 202
 203         op->o_bd = op_be;
 204
 205         /* Give the backend a chance to handle this itself */
 206         if ( op->o_bd->be_extended ) {
 207                 rs->sr_err = op->o_bd->be_extended( op, rs );
 208                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 209                         rs->sr_err != SLAP_CB_CONTINUE )
 210                 {
 211                         rc = rs->sr_err;
 212                         if ( rsp ) {
 213                                 rs->sr_rspdata = rsp;
 214                                 rsp = NULL;
 215                         }
 216                         goto error_return;
 217                 }
 218         }
 219
 220         /* The backend didn't handle it, so try it here */
 221         if( op->o_bd && !op->o_bd->be_modify ) {
 222                 rs->sr_text = "operation not supported for current user";
 223                 rc = LDAP_UNWILLING_TO_PERFORM;
 224                 goto error_return;
 225         }
 226
 227         if ( qpw->rs_old.bv_val != NULL ) {
 228                 Entry *e = NULL;
 229
 230                 rc = be_entry_get_rw( op, &op->o_req_ndn, NULL,
 231                         slap_schema.si_ad_userPassword, 0, &e );
 232                 if ( rc == LDAP_SUCCESS && e ) {
 233                         Attribute *a = attr_find( e->e_attrs,
 234                                 slap_schema.si_ad_userPassword );
 235                         if ( a )
 236                                 rc = slap_passwd_check( op, e, a, &qpw->rs_old, &rs->sr_text );
 237                         else
 238                                 rc = 1;
 239                         be_entry_release_r( op, e );
 240                         if ( rc == LDAP_SUCCESS )
 241                                 goto old_good;
 242                 }
 243                 rs->sr_text = "unwilling to verify old password";
 244                 rc = LDAP_UNWILLING_TO_PERFORM;
 245                 goto error_return;
 246         }
 247
 248 old_good:
 249         ml = ch_malloc( sizeof(Modifications) );
 250         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 251
 252         if ( default_passwd_hash ) {
 253                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 254                 hashes = default_passwd_hash;
 255         } else {
 256                 nhash = 1;
 257                 hashes = (char **)defhash;
 258         }
 259         ml->sml_numvals = nhash;
 260         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 261         for ( i=0; hashes[i]; i++ ) {
 262                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 263                 if ( hash.bv_len == 0 ) {
 264                         if ( !rs->sr_text ) {
 265                                 rs->sr_text = "password hash failed";
 266                         }
 267                         break;
 268                 }
 269                 ml->sml_values[i] = hash;
 270         }
 271         ml->sml_values[i].bv_val = NULL;
 272         ml->sml_nvalues = NULL;
 273         ml->sml_desc = slap_schema.si_ad_userPassword;
 274         ml->sml_type = ml->sml_desc->ad_cname;
 275         ml->sml_op = LDAP_MOD_REPLACE;
 276         ml->sml_flags = 0;
 277         ml->sml_next = qpw->rs_mods;
 278         qpw->rs_mods = ml;
 279
 280         if ( hashes[i] ) {
 281                 rs->sr_err = LDAP_OTHER;
 282
 283         } else {
 284                 slap_callback *sc = op->o_callback;
 285
 286                 op->o_tag = LDAP_REQ_MODIFY;
 287                 op->o_callback = &cb;
 288                 op->orm_modlist = qpw->rs_mods;
 289                 op->orm_no_opattrs = 0;
 290
 291                 cb.sc_private = qpw;    /* let Modify know this was pwdMod,
 292                                          * if it cares... */
 293
 294                 rs->sr_err = op->o_bd->be_modify( op, rs );
 295
 296                 /* be_modify() might have shuffled modifications */
 297                 qpw->rs_mods = op->orm_modlist;
 298
 299                 if ( rs->sr_err == LDAP_SUCCESS ) {
 300                         rs->sr_rspdata = rsp;
 301
 302                 } else if ( rsp ) {
 303                         ber_bvfree( rsp );
 304                         rsp = NULL;
 305                 }
 306                 op->o_tag = LDAP_REQ_EXTENDED;
 307                 op->o_callback = sc;
 308         }
 309
 310         rc = rs->sr_err;
 311         op->oq_extended = qext;
 312
 313 error_return:;
 314         if ( qpw->rs_mods ) {
 315                 slap_mods_free( qpw->rs_mods, 1 );
 316         }
 317         if ( freenewpw ) {
 318                 free( qpw->rs_new.bv_val );
 319         }
 320         if ( !BER_BVISNULL( &dn ) ) {
 321                 op->o_tmpfree( dn.bv_val, op->o_tmpmemctx );
 322                 BER_BVZERO( &op->o_req_dn );
 323         }
 324         if ( !BER_BVISNULL( &ndn ) ) {
 325                 op->o_tmpfree( ndn.bv_val, op->o_tmpmemctx );
 326                 BER_BVZERO( &op->o_req_ndn );
 327         }
 328
 329         return rc;
 330 }
 331
 332 /* NOTE: The DN in *id is NOT NUL-terminated here. dnNormalize will
 333  * reject it in this condition, the caller must NUL-terminate it.
 334  * FIXME: should dnNormalize still be complaining about that?
 335  */
 336 int slap_passwd_parse( struct berval *reqdata,
 337         struct berval *id,
 338         struct berval *oldpass,
 339         struct berval *newpass,
 340         const char **text )
 341 {
 342         int rc = LDAP_SUCCESS;
 343         ber_tag_t tag;
 344         ber_len_t len = -1;
 345         BerElementBuffer berbuf;
 346         BerElement *ber = (BerElement *)&berbuf;
 347
 348         if( reqdata == NULL ) {
 349                 return LDAP_SUCCESS;
 350         }
 351
 352         if( reqdata->bv_len == 0 ) {
 353                 *text = "empty request data field";
 354                 return LDAP_PROTOCOL_ERROR;
 355         }
 356
 357         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 358         ber_init2( ber, reqdata, 0 );
 359
 360         tag = ber_skip_tag( ber, &len );
 361
 362         if( tag != LBER_SEQUENCE ) {
 363                 Debug( LDAP_DEBUG_TRACE,
 364                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 365                 rc = LDAP_PROTOCOL_ERROR;
 366                 goto done;
 367         }
 368
 369         tag = ber_peek_tag( ber, &len );
 370         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 371                 if( id == NULL ) {
 372                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 373                                 0, 0, 0 );
 374
 375                         *text = "user must change own password";
 376                         rc = LDAP_UNWILLING_TO_PERFORM;
 377                         goto done;
 378                 }
 379
 380                 tag = ber_get_stringbv( ber, id, LBER_BV_NOTERM );
 381
 382                 if( tag == LBER_ERROR ) {
 383                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 384                                 0, 0, 0 );
 385
 386                         goto decoding_error;
 387                 }
 388
 389                 tag = ber_peek_tag( ber, &len );
 390         }
 391
 392         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 393                 if( oldpass == NULL ) {
 394                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 395                                 0, 0, 0 );
 396
 397                         *text = "use bind to verify old password";
 398                         rc = LDAP_UNWILLING_TO_PERFORM;
 399                         goto done;
 400                 }
 401
 402                 tag = ber_get_stringbv( ber, oldpass, LBER_BV_NOTERM );
 403
 404                 if( tag == LBER_ERROR ) {
 405                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 406                                 0, 0, 0 );
 407
 408                         goto decoding_error;
 409                 }
 410
 411                 if( oldpass->bv_len == 0 ) {
 412                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n",
 413                                 0, 0, 0 );
 414
 415                         *text = "old password value is empty";
 416                         rc = LDAP_UNWILLING_TO_PERFORM;
 417                         goto done;
 418                 }
 419
 420                 tag = ber_peek_tag( ber, &len );
 421         }
 422
 423         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 424                 if( newpass == NULL ) {
 425                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 426                                 0, 0, 0 );
 427
 428                         *text = "user specified passwords disallowed";
 429                         rc = LDAP_UNWILLING_TO_PERFORM;
 430                         goto done;
 431                 }
 432
 433                 tag = ber_get_stringbv( ber, newpass, LBER_BV_NOTERM );
 434
 435                 if( tag == LBER_ERROR ) {
 436                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
 437                                 0, 0, 0 );
 438
 439                         goto decoding_error;
 440                 }
 441
 442                 if( newpass->bv_len == 0 ) {
 443                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n",
 444                                 0, 0, 0 );
 445
 446                         *text = "new password value is empty";
 447                         rc = LDAP_UNWILLING_TO_PERFORM;
 448                         goto done;
 449                 }
 450
 451                 tag = ber_peek_tag( ber, &len );
 452         }
 453
 454         if( len != 0 ) {
 455 decoding_error:
 456                 Debug( LDAP_DEBUG_TRACE,
 457                         "slap_passwd_parse: decoding error, len=%ld\n",
 458                         (long) len, 0, 0 );
 459
 460                 *text = "data decoding error";
 461                 rc = LDAP_PROTOCOL_ERROR;
 462         }
 463
 464 done:
 465         return rc;
 466 }
 467
 468 struct berval * slap_passwd_return(
 469         struct berval           *cred )
 470 {
 471         int rc;
 472         struct berval *bv = NULL;
 473         BerElementBuffer berbuf;
 474         /* opaque structure, size unknown but smaller than berbuf */
 475         BerElement *ber = (BerElement *)&berbuf;
 476
 477         assert( cred != NULL );
 478
 479         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 480                 (long) cred->bv_len, 0, 0 );
 481
 482         ber_init_w_nullc( ber, LBER_USE_DER );
 483
 484         rc = ber_printf( ber, "{tON}",
 485                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 486
 487         if( rc >= 0 ) {
 488                 (void) ber_flatten( ber, &bv );
 489         }
 490
 491         ber_free_buf( ber );
 492
 493         return bv;
 494 }
 495
 496 /*
 497  * if "e" is provided, access to each value of the password is checked first
 498  */
 499 int
 500 slap_passwd_check(
 501         Operation       *op,
 502         Entry           *e,
 503         Attribute       *a,
 504         struct berval   *cred,
 505         const char      **text )
 506 {
 507         int                     result = 1;
 508         struct berval           *bv;
 509         AccessControlState      acl_state = ACL_STATE_INIT;
 510         char            credNul = cred->bv_val[cred->bv_len];
 511
 512 #ifdef SLAPD_SPASSWD
 513         void            *old_authctx = NULL;
 514
 515         ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind,
 516                 op->o_conn->c_sasl_authctx, 0, &old_authctx, NULL );
 517 #endif
 518
 519         if ( credNul ) cred->bv_val[cred->bv_len] = 0;
 520
 521         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 522                 /* if e is provided, check access */
 523                 if ( e && access_allowed( op, e, a->a_desc, bv,
 524                                         ACL_AUTH, &acl_state ) == 0 )
 525                 {
 526                         continue;
 527                 }
 528
 529                 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
 530                         result = 0;
 531                         break;
 532                 }
 533         }
 534
 535         if ( credNul ) cred->bv_val[cred->bv_len] = credNul;
 536
 537 #ifdef SLAPD_SPASSWD
 538         ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind,
 539                 old_authctx, 0, NULL, NULL );
 540 #endif
 541
 542         return result;
 543 }
 544
 545 void
 546 slap_passwd_generate( struct berval *pass )
 547 {
 548         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 549         BER_BVZERO( pass );
 550
 551         /*
 552          * generate passwords of only 8 characters as some getpass(3)
 553          * implementations truncate at 8 characters.
 554          */
 555         lutil_passwd_generate( pass, 8 );
 556 }
 557
 558 void
 559 slap_passwd_hash_type(
 560         struct berval * cred,
 561         struct berval * new,
 562         char *hash,
 563         const char **text )
 564 {
 565         new->bv_len = 0;
 566         new->bv_val = NULL;
 567
 568         assert( hash != NULL );
 569
 570         lutil_passwd_hash( cred , hash, new, text );
 571 }
 572 void
 573 slap_passwd_hash(
 574         struct berval * cred,
 575         struct berval * new,
 576         const char **text )
 577 {
 578         char *hash = NULL;
 579         if ( default_passwd_hash ) {
 580                 hash = default_passwd_hash[0];
 581         }
 582         if ( !hash ) {
 583                 hash = (char *)defhash[0];
 584         }
 585
 586         slap_passwd_hash_type( cred, new, hash, text );
 587 }
 588
 589 #ifdef SLAPD_CRYPT
 590 static ldap_pvt_thread_mutex_t passwd_mutex;
 591 static lutil_cryptfunc slapd_crypt;
 592
 593 static int slapd_crypt( const char *key, const char *salt, char **hash )
 594 {
 595         char *cr;
 596         int rc;
 597
 598         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 599
 600         cr = crypt( key, salt );
 601         if ( cr == NULL || cr[0] == '\0' ) {
 602                 /* salt must have been invalid */
 603                 rc = LUTIL_PASSWD_ERR;
 604         } else {
 605                 if ( hash ) {
 606                         *hash = ber_strdup( cr );
 607                         rc = LUTIL_PASSWD_OK;
 608
 609                 } else {
 610                         rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 611                 }
 612         }
 613
 614         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 615         return rc;
 616 }
 617 #endif /* SLAPD_CRYPT */
 618
 619 void slap_passwd_init()
 620 {
 621 #ifdef SLAPD_CRYPT
 622         ldap_pvt_thread_mutex_init( &passwd_mutex );
 623         lutil_cryptptr = slapd_crypt;
 624 #endif
 625 }
 626