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 1998-2006 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/krb.h>
  22 #include <ac/socket.h>
  23 #include <ac/string.h>
  24 #include <ac/unistd.h>
  25
  26 #ifdef SLAPD_CRYPT
  27 #include <ac/crypt.h>
  28 #endif
  29
  30 #include "slap.h"
  31
  32 #include <lber_pvt.h>
  33 #include <lutil.h>
  34 #include <lutil_sha1.h>
  35
  36 static const char *defhash[] = {
  37 #ifdef LUTIL_SHA1_BYTES
  38         "{SSHA}",
  39 #else
  40         "{SMD5}",
  41 #endif
  42         NULL
  43 };
  44
  45 int passwd_extop(
  46         Operation *op,
  47         SlapReply *rs )
  48 {
  49         struct berval id = {0, NULL}, hash, *rsp = NULL;
  50         req_pwdexop_s *qpw = &op->oq_pwdexop;
  51         req_extended_s qext = op->oq_extended;
  52         Modifications *ml;
  53         slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
  54         slap_callback cb2 = { NULL, slap_replog_cb, NULL, NULL };
  55         int i, nhash;
  56         char **hashes;
  57         int rc;
  58         BackendDB *op_be;
  59         int freenewpw = 0;
  60
  61         cb2.sc_next = &cb;
  62
  63         assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
  64
  65         if( op->o_dn.bv_len == 0 ) {
  66                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD\n",
  67                         op->o_log_prefix, 0, 0, 0, 0 );
  68                 rs->sr_text = "only authenticated users may change passwords";
  69                 return LDAP_STRONG_AUTH_REQUIRED;
  70         }
  71
  72         qpw->rs_old.bv_len = 0;
  73         qpw->rs_old.bv_val = NULL;
  74         qpw->rs_new.bv_len = 0;
  75         qpw->rs_new.bv_val = NULL;
  76         qpw->rs_mods = NULL;
  77         qpw->rs_modtail = NULL;
  78
  79         rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id,
  80                 &qpw->rs_old, &qpw->rs_new, &rs->sr_text );
  81
  82         if ( rs->sr_err == LDAP_SUCCESS && !BER_BVISEMPTY( &id ) ) {
  83                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD id=\"%s\"%s%s\n",
  84                         op->o_log_prefix, id.bv_val,
  85                         qpw->rs_old.bv_val ? " old" : "",
  86                         qpw->rs_new.bv_val ? " new" : "", 0 );
  87         } else {
  88                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD%s%s\n",
  89                         op->o_log_prefix,
  90                         qpw->rs_old.bv_val ? " old" : "",
  91                         qpw->rs_new.bv_val ? " new" : "", 0, 0 );
  92         }
  93
  94         if ( rs->sr_err != LDAP_SUCCESS ) {
  95                 return rs->sr_err;
  96         }
  97
  98         if ( !BER_BVISEMPTY( &id ) ) {
  99                 rs->sr_err = dnPrettyNormal( NULL, &id, &op->o_req_dn,
 100                                 &op->o_req_ndn, op->o_tmpmemctx );
 101                 if ( rs->sr_err != LDAP_SUCCESS ) {
 102                         rs->sr_text = "Invalid DN";
 103                         rc = rs->sr_err;
 104                         goto error_return;
 105                 }
 106                 op->o_bd = select_backend( &op->o_req_ndn, 0, 1 );
 107
 108         } else {
 109                 ber_dupbv_x( &op->o_req_dn, &op->o_dn, op->o_tmpmemctx );
 110                 ber_dupbv_x( &op->o_req_ndn, &op->o_ndn, op->o_tmpmemctx );
 111                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 112                 op->o_bd = op->o_conn->c_authz_backend;
 113                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 114         }
 115
 116         if( op->o_bd == NULL ) {
 117                 if ( qpw->rs_old.bv_val != NULL ) {
 118                         rs->sr_text = "unwilling to verify old password";
 119                         rc = LDAP_UNWILLING_TO_PERFORM;
 120                         goto error_return;
 121                 }
 122
 123 #ifdef HAVE_CYRUS_SASL
 124                 rc = slap_sasl_setpass( op, rs );
 125 #else
 126                 rs->sr_text = "no authz backend";
 127                 rc = LDAP_OTHER;
 128 #endif
 129                 goto error_return;
 130         }
 131
 132         if ( op->o_req_ndn.bv_len == 0 ) {
 133                 rs->sr_text = "no password is associated with the Root DSE";
 134                 rc = LDAP_UNWILLING_TO_PERFORM;
 135                 goto error_return;
 136         }
 137
 138         /* If we've got a glued backend, check the real backend */
 139         op_be = op->o_bd;
 140         if ( SLAP_GLUE_INSTANCE( op->o_bd )) {
 141                 op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
 142         }
 143
 144         if (backend_check_restrictions( op, rs,
 145                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 146                 rc = rs->sr_err;
 147                 goto error_return;
 148         }
 149
 150         /* check for referrals */
 151         if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 152                 rc = rs->sr_err;
 153                 goto error_return;
 154         }
 155
 156         /* This does not apply to multi-master case */
 157         if(!( !SLAP_SINGLE_SHADOW( op->o_bd ) || be_isupdate( op ))) {
 158                 /* we SHOULD return a referral in this case */
 159                 BerVarray defref = op->o_bd->be_update_refs
 160                         ? op->o_bd->be_update_refs : default_referral;
 161
 162                 if( defref != NULL ) {
 163                         rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
 164                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 165                         if(rs->sr_ref) {
 166                                 rs->sr_flags |= REP_REF_MUSTBEFREED;
 167                         } else {
 168                                 rs->sr_ref = defref;
 169                         }
 170                         rc = LDAP_REFERRAL;
 171                         goto error_return;
 172
 173                 }
 174
 175                 rs->sr_text = "shadow context; no update referral";
 176                 rc = LDAP_UNWILLING_TO_PERFORM;
 177                 goto error_return;
 178         }
 179
 180         /* generate a new password if none was provided */
 181         if ( qpw->rs_new.bv_len == 0 ) {
 182                 slap_passwd_generate( &qpw->rs_new );
 183                 if ( qpw->rs_new.bv_len ) {
 184                         rsp = slap_passwd_return( &qpw->rs_new );
 185                         freenewpw = 1;
 186                 }
 187         }
 188         if ( qpw->rs_new.bv_len == 0 ) {
 189                 rs->sr_text = "password generation failed";
 190                 rc = LDAP_OTHER;
 191                 goto error_return;
 192         }
 193
 194         op->o_bd = op_be;
 195
 196         /* Give the backend a chance to handle this itself */
 197         if ( op->o_bd->be_extended ) {
 198                 rs->sr_err = op->o_bd->be_extended( op, rs );
 199                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 200                         rs->sr_err != SLAP_CB_CONTINUE )
 201                 {
 202                         rc = rs->sr_err;
 203                         if ( rsp ) {
 204                                 rs->sr_rspdata = rsp;
 205                                 rsp = NULL;
 206                         }
 207                         goto error_return;
 208                 }
 209         }
 210
 211         /* The backend didn't handle it, so try it here */
 212         if( op->o_bd && !op->o_bd->be_modify ) {
 213                 rs->sr_text = "operation not supported for current user";
 214                 rc = LDAP_UNWILLING_TO_PERFORM;
 215                 goto error_return;
 216         }
 217
 218         if ( qpw->rs_old.bv_val != NULL ) {
 219                 Entry *e = NULL;
 220
 221                 rc = be_entry_get_rw( op, &op->o_req_ndn, NULL,
 222                         slap_schema.si_ad_userPassword, 0, &e );
 223                 if ( rc == LDAP_SUCCESS && e ) {
 224                         Attribute *a = attr_find( e->e_attrs,
 225                                 slap_schema.si_ad_userPassword );
 226                         if ( a )
 227                                 rc = slap_passwd_check( op, e, a, &qpw->rs_old, &rs->sr_text );
 228                         else
 229                                 rc = 1;
 230                         be_entry_release_r( op, e );
 231                         if ( rc == LDAP_SUCCESS )
 232                                 goto old_good;
 233                 }
 234                 rs->sr_text = "unwilling to verify old password";
 235                 rc = LDAP_UNWILLING_TO_PERFORM;
 236                 goto error_return;
 237         }
 238
 239 old_good:
 240         ml = ch_malloc( sizeof(Modifications) );
 241         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 242
 243         if ( default_passwd_hash ) {
 244                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 245                 hashes = default_passwd_hash;
 246         } else {
 247                 nhash = 1;
 248                 hashes = (char **)defhash;
 249         }
 250         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 251         for ( i=0; hashes[i]; i++ ) {
 252                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 253                 if ( hash.bv_len == 0 ) {
 254                         if ( !rs->sr_text ) {
 255                                 rs->sr_text = "password hash failed";
 256                         }
 257                         break;
 258                 }
 259                 ml->sml_values[i] = hash;
 260         }
 261         ml->sml_values[i].bv_val = NULL;
 262         ml->sml_nvalues = NULL;
 263         ml->sml_desc = slap_schema.si_ad_userPassword;
 264         ml->sml_type = ml->sml_desc->ad_cname;
 265         ml->sml_op = LDAP_MOD_REPLACE;
 266         ml->sml_flags = 0;
 267         ml->sml_next = qpw->rs_mods;
 268         qpw->rs_mods = ml;
 269
 270         if ( hashes[i] ) {
 271                 rs->sr_err = LDAP_OTHER;
 272
 273         } else {
 274                 slap_callback *sc = op->o_callback;
 275
 276                 op->o_tag = LDAP_REQ_MODIFY;
 277                 op->o_callback = &cb2;
 278                 op->orm_modlist = qpw->rs_mods;
 279                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 280                                          * if it cares... */
 281
 282                 rs->sr_err = op->o_bd->be_modify( op, rs );
 283                 if ( rs->sr_err == LDAP_SUCCESS ) {
 284                         rs->sr_rspdata = rsp;
 285                 } else if ( rsp ) {
 286                         ber_bvfree( rsp );
 287                         rsp = NULL;
 288                 }
 289                 op->o_tag = LDAP_REQ_EXTENDED;
 290                 op->o_callback = sc;
 291         }
 292
 293         rc = rs->sr_err;
 294         op->oq_extended = qext;
 295
 296 error_return:;
 297         if ( qpw->rs_mods ) {
 298                 slap_mods_free( qpw->rs_mods, 1 );
 299         }
 300         if ( freenewpw ) {
 301                 free( qpw->rs_new.bv_val );
 302         }
 303         if ( !BER_BVISNULL( &op->o_req_dn ) ) {
 304                 op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 305                 BER_BVZERO( &op->o_req_dn );
 306         }
 307         if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
 308                 op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 309                 BER_BVZERO( &op->o_req_ndn );
 310         }
 311
 312         return rc;
 313 }
 314
 315 int slap_passwd_parse( struct berval *reqdata,
 316         struct berval *id,
 317         struct berval *oldpass,
 318         struct berval *newpass,
 319         const char **text )
 320 {
 321         int rc = LDAP_SUCCESS;
 322         ber_tag_t tag;
 323         ber_len_t len = -1;
 324         BerElementBuffer berbuf;
 325         BerElement *ber = (BerElement *)&berbuf;
 326
 327         if( reqdata == NULL ) {
 328                 return LDAP_SUCCESS;
 329         }
 330
 331         if( reqdata->bv_len == 0 ) {
 332                 *text = "empty request data field";
 333                 return LDAP_PROTOCOL_ERROR;
 334         }
 335
 336         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 337         ber_init2( ber, reqdata, 0 );
 338
 339         tag = ber_scanf( ber, "{" /*}*/ );
 340
 341         if( tag == LBER_ERROR ) {
 342                 Debug( LDAP_DEBUG_TRACE,
 343                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 344                 rc = LDAP_PROTOCOL_ERROR;
 345                 goto done;
 346         }
 347
 348         tag = ber_peek_tag( ber, &len );
 349         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 350                 if( id == NULL ) {
 351                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 352                                 0, 0, 0 );
 353
 354                         *text = "user must change own password";
 355                         rc = LDAP_UNWILLING_TO_PERFORM;
 356                         goto done;
 357                 }
 358
 359                 tag = ber_scanf( ber, "m", id );
 360
 361                 if( tag == LBER_ERROR ) {
 362                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 363                                 0, 0, 0 );
 364
 365                         goto decoding_error;
 366                 }
 367
 368                 tag = ber_peek_tag( ber, &len );
 369         }
 370
 371         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 372                 if( oldpass == NULL ) {
 373                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 374                                 0, 0, 0 );
 375
 376                         *text = "use bind to verify old password";
 377                         rc = LDAP_UNWILLING_TO_PERFORM;
 378                         goto done;
 379                 }
 380
 381                 tag = ber_scanf( ber, "m", oldpass );
 382
 383                 if( tag == LBER_ERROR ) {
 384                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 385                                 0, 0, 0 );
 386
 387                         goto decoding_error;
 388                 }
 389
 390                 if( oldpass->bv_len == 0 ) {
 391                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n",
 392                                 0, 0, 0 );
 393
 394                         *text = "old password value is empty";
 395                         rc = LDAP_UNWILLING_TO_PERFORM;
 396                         goto done;
 397                 }
 398
 399                 tag = ber_peek_tag( ber, &len );
 400         }
 401
 402         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 403                 if( newpass == NULL ) {
 404                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 405                                 0, 0, 0 );
 406
 407                         *text = "user specified passwords disallowed";
 408                         rc = LDAP_UNWILLING_TO_PERFORM;
 409                         goto done;
 410                 }
 411
 412                 tag = ber_scanf( ber, "m", newpass );
 413
 414                 if( tag == LBER_ERROR ) {
 415                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
 416                                 0, 0, 0 );
 417
 418                         goto decoding_error;
 419                 }
 420
 421                 if( newpass->bv_len == 0 ) {
 422                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n",
 423                                 0, 0, 0 );
 424
 425                         *text = "new password value is empty";
 426                         rc = LDAP_UNWILLING_TO_PERFORM;
 427                         goto done;
 428                 }
 429
 430                 tag = ber_peek_tag( ber, &len );
 431         }
 432
 433         if( len != 0 ) {
 434 decoding_error:
 435                 Debug( LDAP_DEBUG_TRACE,
 436                         "slap_passwd_parse: decoding error, len=%ld\n",
 437                         (long) len, 0, 0 );
 438
 439                 *text = "data decoding error";
 440                 rc = LDAP_PROTOCOL_ERROR;
 441         }
 442
 443 done:
 444         return rc;
 445 }
 446
 447 struct berval * slap_passwd_return(
 448         struct berval           *cred )
 449 {
 450         int rc;
 451         struct berval *bv = NULL;
 452         BerElementBuffer berbuf;
 453         /* opaque structure, size unknown but smaller than berbuf */
 454         BerElement *ber = (BerElement *)&berbuf;
 455
 456         assert( cred != NULL );
 457
 458         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 459                 (long) cred->bv_len, 0, 0 );
 460
 461         ber_init_w_nullc( ber, LBER_USE_DER );
 462
 463         rc = ber_printf( ber, "{tON}",
 464                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 465
 466         if( rc >= 0 ) {
 467                 (void) ber_flatten( ber, &bv );
 468         }
 469
 470         ber_free_buf( ber );
 471
 472         return bv;
 473 }
 474
 475 /*
 476  * if "e" is provided, access to each value of the password is checked first
 477  */
 478 int
 479 slap_passwd_check(
 480         Operation       *op,
 481         Entry           *e,
 482         Attribute       *a,
 483         struct berval   *cred,
 484         const char      **text )
 485 {
 486         int                     result = 1;
 487         struct berval           *bv;
 488         AccessControlState      acl_state = ACL_STATE_INIT;
 489
 490 #ifdef SLAPD_SPASSWD
 491         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 492                 op->o_conn->c_sasl_authctx, NULL );
 493 #endif
 494
 495         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 496                 /* if e is provided, check access */
 497                 if ( e && access_allowed( op, e, a->a_desc, bv,
 498                                         ACL_AUTH, &acl_state ) == 0 )
 499                 {
 500                         continue;
 501                 }
 502
 503                 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
 504                         result = 0;
 505                         break;
 506                 }
 507         }
 508
 509 #ifdef SLAPD_SPASSWD
 510         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 511                 NULL, NULL );
 512 #endif
 513
 514         return result;
 515 }
 516
 517 void
 518 slap_passwd_generate( struct berval *pass )
 519 {
 520         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 521         pass->bv_val = NULL;
 522         pass->bv_len = 0;
 523
 524         /*
 525          * generate passwords of only 8 characters as some getpass(3)
 526          * implementations truncate at 8 characters.
 527          */
 528         lutil_passwd_generate( pass, 8 );
 529 }
 530
 531 void
 532 slap_passwd_hash_type(
 533         struct berval * cred,
 534         struct berval * new,
 535         char *hash,
 536         const char **text )
 537 {
 538         new->bv_len = 0;
 539         new->bv_val = NULL;
 540
 541         assert( hash != NULL );
 542
 543         lutil_passwd_hash( cred , hash, new, text );
 544 }
 545 void
 546 slap_passwd_hash(
 547         struct berval * cred,
 548         struct berval * new,
 549         const char **text )
 550 {
 551         char *hash = NULL;
 552         if ( default_passwd_hash ) {
 553                 hash = default_passwd_hash[0];
 554         }
 555         if ( !hash ) {
 556                 hash = (char *)defhash[0];
 557         }
 558
 559         slap_passwd_hash_type( cred, new, hash, text );
 560 }
 561
 562 #ifdef SLAPD_CRYPT
 563 static ldap_pvt_thread_mutex_t passwd_mutex;
 564 static lutil_cryptfunc slapd_crypt;
 565
 566 static int slapd_crypt( const char *key, const char *salt, char **hash )
 567 {
 568         char *cr;
 569         int rc;
 570
 571         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 572
 573         cr = crypt( key, salt );
 574         if ( cr == NULL || cr[0] == '\0' ) {
 575                 /* salt must have been invalid */
 576                 rc = LUTIL_PASSWD_ERR;
 577         } else {
 578                 if ( hash ) {
 579                         *hash = ber_strdup( cr );
 580                         rc = LUTIL_PASSWD_OK;
 581
 582                 } else {
 583                         rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 584                 }
 585         }
 586
 587         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 588         return rc;
 589 }
 590 #endif /* SLAPD_CRYPT */
 591
 592 void slap_passwd_init()
 593 {
 594 #ifdef SLAPD_CRYPT
 595         ldap_pvt_thread_mutex_init( &passwd_mutex );
 596         lutil_cryptptr = slapd_crypt;
 597 #endif
 598 }
 599