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 1998-2007 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         slap_callback cb2 = { NULL, slap_replog_cb, NULL, NULL };
  56         int i, nhash;
  57         char **hashes;
  58         int rc;
  59         BackendDB *op_be;
  60         int freenewpw = 0;
  61
  62         cb2.sc_next = &cb;
  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 ( rs->sr_err == LDAP_SUCCESS && !BER_BVISEMPTY( &id ) ) {
  84                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD id=\"%s\"%s%s\n",
  85                         op->o_log_prefix, id.bv_val,
  86                         qpw->rs_old.bv_val ? " old" : "",
  87                         qpw->rs_new.bv_val ? " new" : "", 0 );
  88         } else {
  89                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD%s%s\n",
  90                         op->o_log_prefix,
  91                         qpw->rs_old.bv_val ? " old" : "",
  92                         qpw->rs_new.bv_val ? " new" : "", 0, 0 );
  93         }
  94
  95         if ( rs->sr_err != LDAP_SUCCESS ) {
  96                 return rs->sr_err;
  97         }
  98
  99         if ( !BER_BVISEMPTY( &id ) ) {
 100                 rs->sr_err = dnPrettyNormal( NULL, &id, &op->o_req_dn,
 101                                 &op->o_req_ndn, op->o_tmpmemctx );
 102                 if ( rs->sr_err != LDAP_SUCCESS ) {
 103                         rs->sr_text = "Invalid DN";
 104                         rc = rs->sr_err;
 105                         goto error_return;
 106                 }
 107                 op->o_bd = select_backend( &op->o_req_ndn, 0, 1 );
 108
 109         } else {
 110                 ber_dupbv_x( &op->o_req_dn, &op->o_dn, op->o_tmpmemctx );
 111                 ber_dupbv_x( &op->o_req_ndn, &op->o_ndn, op->o_tmpmemctx );
 112                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 113                 op->o_bd = op->o_conn->c_authz_backend;
 114                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 115         }
 116
 117         if( op->o_bd == NULL ) {
 118                 if ( qpw->rs_old.bv_val != NULL ) {
 119                         rs->sr_text = "unwilling to verify old password";
 120                         rc = LDAP_UNWILLING_TO_PERFORM;
 121                         goto error_return;
 122                 }
 123
 124 #ifdef HAVE_CYRUS_SASL
 125                 rc = slap_sasl_setpass( op, rs );
 126 #else
 127                 rs->sr_text = "no authz backend";
 128                 rc = LDAP_OTHER;
 129 #endif
 130                 goto error_return;
 131         }
 132
 133         if ( op->o_req_ndn.bv_len == 0 ) {
 134                 rs->sr_text = "no password is associated with the Root DSE";
 135                 rc = LDAP_UNWILLING_TO_PERFORM;
 136                 goto error_return;
 137         }
 138
 139         /* If we've got a glued backend, check the real backend */
 140         op_be = op->o_bd;
 141         if ( SLAP_GLUE_INSTANCE( op->o_bd )) {
 142                 op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
 143         }
 144
 145         if (backend_check_restrictions( op, rs,
 146                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 147                 rc = rs->sr_err;
 148                 goto error_return;
 149         }
 150
 151         /* check for referrals */
 152         if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 153                 rc = rs->sr_err;
 154                 goto error_return;
 155         }
 156
 157         /* This does not apply to multi-master case */
 158         if(!( !SLAP_SINGLE_SHADOW( op->o_bd ) || be_isupdate( op ))) {
 159                 /* we SHOULD return a referral in this case */
 160                 BerVarray defref = op->o_bd->be_update_refs
 161                         ? op->o_bd->be_update_refs : default_referral;
 162
 163                 if( defref != NULL ) {
 164                         rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
 165                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 166                         if(rs->sr_ref) {
 167                                 rs->sr_flags |= REP_REF_MUSTBEFREED;
 168                         } else {
 169                                 rs->sr_ref = defref;
 170                         }
 171                         rc = LDAP_REFERRAL;
 172                         goto error_return;
 173
 174                 }
 175
 176                 rs->sr_text = "shadow context; no update referral";
 177                 rc = LDAP_UNWILLING_TO_PERFORM;
 178                 goto error_return;
 179         }
 180
 181         /* generate a new password if none was provided */
 182         if ( qpw->rs_new.bv_len == 0 ) {
 183                 slap_passwd_generate( &qpw->rs_new );
 184                 if ( qpw->rs_new.bv_len ) {
 185                         rsp = slap_passwd_return( &qpw->rs_new );
 186                         freenewpw = 1;
 187                 }
 188         }
 189         if ( qpw->rs_new.bv_len == 0 ) {
 190                 rs->sr_text = "password generation failed";
 191                 rc = LDAP_OTHER;
 192                 goto error_return;
 193         }
 194
 195         op->o_bd = op_be;
 196
 197         /* Give the backend a chance to handle this itself */
 198         if ( op->o_bd->be_extended ) {
 199                 rs->sr_err = op->o_bd->be_extended( op, rs );
 200                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 201                         rs->sr_err != SLAP_CB_CONTINUE )
 202                 {
 203                         rc = rs->sr_err;
 204                         if ( rsp ) {
 205                                 rs->sr_rspdata = rsp;
 206                                 rsp = NULL;
 207                         }
 208                         goto error_return;
 209                 }
 210         }
 211
 212         /* The backend didn't handle it, so try it here */
 213         if( op->o_bd && !op->o_bd->be_modify ) {
 214                 rs->sr_text = "operation not supported for current user";
 215                 rc = LDAP_UNWILLING_TO_PERFORM;
 216                 goto error_return;
 217         }
 218
 219         if ( qpw->rs_old.bv_val != NULL ) {
 220                 Entry *e = NULL;
 221
 222                 rc = be_entry_get_rw( op, &op->o_req_ndn, NULL,
 223                         slap_schema.si_ad_userPassword, 0, &e );
 224                 if ( rc == LDAP_SUCCESS && e ) {
 225                         Attribute *a = attr_find( e->e_attrs,
 226                                 slap_schema.si_ad_userPassword );
 227                         if ( a )
 228                                 rc = slap_passwd_check( op, e, a, &qpw->rs_old, &rs->sr_text );
 229                         else
 230                                 rc = 1;
 231                         be_entry_release_r( op, e );
 232                         if ( rc == LDAP_SUCCESS )
 233                                 goto old_good;
 234                 }
 235                 rs->sr_text = "unwilling to verify old password";
 236                 rc = LDAP_UNWILLING_TO_PERFORM;
 237                 goto error_return;
 238         }
 239
 240 old_good:
 241         ml = ch_malloc( sizeof(Modifications) );
 242         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 243
 244         if ( default_passwd_hash ) {
 245                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 246                 hashes = default_passwd_hash;
 247         } else {
 248                 nhash = 1;
 249                 hashes = (char **)defhash;
 250         }
 251         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 252         for ( i=0; hashes[i]; i++ ) {
 253                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 254                 if ( hash.bv_len == 0 ) {
 255                         if ( !rs->sr_text ) {
 256                                 rs->sr_text = "password hash failed";
 257                         }
 258                         break;
 259                 }
 260                 ml->sml_values[i] = hash;
 261         }
 262         ml->sml_values[i].bv_val = NULL;
 263         ml->sml_nvalues = NULL;
 264         ml->sml_desc = slap_schema.si_ad_userPassword;
 265         ml->sml_type = ml->sml_desc->ad_cname;
 266         ml->sml_op = LDAP_MOD_REPLACE;
 267         ml->sml_flags = 0;
 268         ml->sml_next = qpw->rs_mods;
 269         qpw->rs_mods = ml;
 270
 271         if ( hashes[i] ) {
 272                 rs->sr_err = LDAP_OTHER;
 273
 274         } else {
 275                 slap_callback *sc = op->o_callback;
 276
 277                 op->o_tag = LDAP_REQ_MODIFY;
 278                 op->o_callback = &cb2;
 279                 op->orm_modlist = qpw->rs_mods;
 280                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 281                                          * if it cares... */
 282
 283                 rs->sr_err = op->o_bd->be_modify( op, rs );
 284
 285                 /* be_modify() might have shuffled modifications */
 286                 qpw->rs_mods = op->orm_modlist;
 287
 288                 if ( rs->sr_err == LDAP_SUCCESS ) {
 289                         rs->sr_rspdata = rsp;
 290
 291                 } else if ( rsp ) {
 292                         ber_bvfree( rsp );
 293                         rsp = NULL;
 294                 }
 295                 op->o_tag = LDAP_REQ_EXTENDED;
 296                 op->o_callback = sc;
 297         }
 298
 299         rc = rs->sr_err;
 300         op->oq_extended = qext;
 301
 302 error_return:;
 303         if ( qpw->rs_mods ) {
 304                 slap_mods_free( qpw->rs_mods, 1 );
 305         }
 306         if ( freenewpw ) {
 307                 free( qpw->rs_new.bv_val );
 308         }
 309         if ( !BER_BVISNULL( &op->o_req_dn ) ) {
 310                 op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 311                 BER_BVZERO( &op->o_req_dn );
 312         }
 313         if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
 314                 op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 315                 BER_BVZERO( &op->o_req_ndn );
 316         }
 317
 318         return rc;
 319 }
 320
 321 int slap_passwd_parse( struct berval *reqdata,
 322         struct berval *id,
 323         struct berval *oldpass,
 324         struct berval *newpass,
 325         const char **text )
 326 {
 327         int rc = LDAP_SUCCESS;
 328         ber_tag_t tag;
 329         ber_len_t len = -1;
 330         BerElementBuffer berbuf;
 331         BerElement *ber = (BerElement *)&berbuf;
 332
 333         if( reqdata == NULL ) {
 334                 return LDAP_SUCCESS;
 335         }
 336
 337         if( reqdata->bv_len == 0 ) {
 338                 *text = "empty request data field";
 339                 return LDAP_PROTOCOL_ERROR;
 340         }
 341
 342         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 343         ber_init2( ber, reqdata, 0 );
 344
 345         tag = ber_scanf( ber, "{" /*}*/ );
 346
 347         if( tag == LBER_ERROR ) {
 348                 Debug( LDAP_DEBUG_TRACE,
 349                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 350                 rc = LDAP_PROTOCOL_ERROR;
 351                 goto done;
 352         }
 353
 354         tag = ber_peek_tag( ber, &len );
 355         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 356                 if( id == NULL ) {
 357                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 358                                 0, 0, 0 );
 359
 360                         *text = "user must change own password";
 361                         rc = LDAP_UNWILLING_TO_PERFORM;
 362                         goto done;
 363                 }
 364
 365                 tag = ber_scanf( ber, "m", id );
 366
 367                 if( tag == LBER_ERROR ) {
 368                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 369                                 0, 0, 0 );
 370
 371                         goto decoding_error;
 372                 }
 373
 374                 tag = ber_peek_tag( ber, &len );
 375         }
 376
 377         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 378                 if( oldpass == NULL ) {
 379                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 380                                 0, 0, 0 );
 381
 382                         *text = "use bind to verify old password";
 383                         rc = LDAP_UNWILLING_TO_PERFORM;
 384                         goto done;
 385                 }
 386
 387                 tag = ber_scanf( ber, "m", oldpass );
 388
 389                 if( tag == LBER_ERROR ) {
 390                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 391                                 0, 0, 0 );
 392
 393                         goto decoding_error;
 394                 }
 395
 396                 if( oldpass->bv_len == 0 ) {
 397                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n",
 398                                 0, 0, 0 );
 399
 400                         *text = "old password value is empty";
 401                         rc = LDAP_UNWILLING_TO_PERFORM;
 402                         goto done;
 403                 }
 404
 405                 tag = ber_peek_tag( ber, &len );
 406         }
 407
 408         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 409                 if( newpass == NULL ) {
 410                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 411                                 0, 0, 0 );
 412
 413                         *text = "user specified passwords disallowed";
 414                         rc = LDAP_UNWILLING_TO_PERFORM;
 415                         goto done;
 416                 }
 417
 418                 tag = ber_scanf( ber, "m", newpass );
 419
 420                 if( tag == LBER_ERROR ) {
 421                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
 422                                 0, 0, 0 );
 423
 424                         goto decoding_error;
 425                 }
 426
 427                 if( newpass->bv_len == 0 ) {
 428                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n",
 429                                 0, 0, 0 );
 430
 431                         *text = "new password value is empty";
 432                         rc = LDAP_UNWILLING_TO_PERFORM;
 433                         goto done;
 434                 }
 435
 436                 tag = ber_peek_tag( ber, &len );
 437         }
 438
 439         if( len != 0 ) {
 440 decoding_error:
 441                 Debug( LDAP_DEBUG_TRACE,
 442                         "slap_passwd_parse: decoding error, len=%ld\n",
 443                         (long) len, 0, 0 );
 444
 445                 *text = "data decoding error";
 446                 rc = LDAP_PROTOCOL_ERROR;
 447         }
 448
 449 done:
 450         return rc;
 451 }
 452
 453 struct berval * slap_passwd_return(
 454         struct berval           *cred )
 455 {
 456         int rc;
 457         struct berval *bv = NULL;
 458         BerElementBuffer berbuf;
 459         /* opaque structure, size unknown but smaller than berbuf */
 460         BerElement *ber = (BerElement *)&berbuf;
 461
 462         assert( cred != NULL );
 463
 464         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 465                 (long) cred->bv_len, 0, 0 );
 466
 467         ber_init_w_nullc( ber, LBER_USE_DER );
 468
 469         rc = ber_printf( ber, "{tON}",
 470                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 471
 472         if( rc >= 0 ) {
 473                 (void) ber_flatten( ber, &bv );
 474         }
 475
 476         ber_free_buf( ber );
 477
 478         return bv;
 479 }
 480
 481 /*
 482  * if "e" is provided, access to each value of the password is checked first
 483  */
 484 int
 485 slap_passwd_check(
 486         Operation       *op,
 487         Entry           *e,
 488         Attribute       *a,
 489         struct berval   *cred,
 490         const char      **text )
 491 {
 492         int                     result = 1;
 493         struct berval           *bv;
 494         AccessControlState      acl_state = ACL_STATE_INIT;
 495
 496 #ifdef SLAPD_SPASSWD
 497         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 498                 op->o_conn->c_sasl_authctx, NULL );
 499 #endif
 500
 501         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 502                 /* if e is provided, check access */
 503                 if ( e && access_allowed( op, e, a->a_desc, bv,
 504                                         ACL_AUTH, &acl_state ) == 0 )
 505                 {
 506                         continue;
 507                 }
 508
 509                 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
 510                         result = 0;
 511                         break;
 512                 }
 513         }
 514
 515 #ifdef SLAPD_SPASSWD
 516         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 517                 NULL, NULL );
 518 #endif
 519
 520         return result;
 521 }
 522
 523 void
 524 slap_passwd_generate( struct berval *pass )
 525 {
 526         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 527         BER_BVZERO( pass );
 528
 529         /*
 530          * generate passwords of only 8 characters as some getpass(3)
 531          * implementations truncate at 8 characters.
 532          */
 533         lutil_passwd_generate( pass, 8 );
 534 }
 535
 536 void
 537 slap_passwd_hash_type(
 538         struct berval * cred,
 539         struct berval * new,
 540         char *hash,
 541         const char **text )
 542 {
 543         new->bv_len = 0;
 544         new->bv_val = NULL;
 545
 546         assert( hash != NULL );
 547
 548         lutil_passwd_hash( cred , hash, new, text );
 549 }
 550 void
 551 slap_passwd_hash(
 552         struct berval * cred,
 553         struct berval * new,
 554         const char **text )
 555 {
 556         char *hash = NULL;
 557         if ( default_passwd_hash ) {
 558                 hash = default_passwd_hash[0];
 559         }
 560         if ( !hash ) {
 561                 hash = (char *)defhash[0];
 562         }
 563
 564         slap_passwd_hash_type( cred, new, hash, text );
 565 }
 566
 567 #ifdef SLAPD_CRYPT
 568 static ldap_pvt_thread_mutex_t passwd_mutex;
 569 static lutil_cryptfunc slapd_crypt;
 570
 571 static int slapd_crypt( const char *key, const char *salt, char **hash )
 572 {
 573         char *cr;
 574         int rc;
 575
 576         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 577
 578         cr = crypt( key, salt );
 579         if ( cr == NULL || cr[0] == '\0' ) {
 580                 /* salt must have been invalid */
 581                 rc = LUTIL_PASSWD_ERR;
 582         } else {
 583                 if ( hash ) {
 584                         *hash = ber_strdup( cr );
 585                         rc = LUTIL_PASSWD_OK;
 586
 587                 } else {
 588                         rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 589                 }
 590         }
 591
 592         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 593         return rc;
 594 }
 595 #endif /* SLAPD_CRYPT */
 596
 597 void slap_passwd_init()
 598 {
 599 #ifdef SLAPD_CRYPT
 600         ldap_pvt_thread_mutex_init( &passwd_mutex );
 601         lutil_cryptptr = slapd_crypt;
 602 #endif
 603 }
 604