external/bsd/openldap/dist/servers/slapd/passwd.c

   1 /* passwd.c - password extended operation routines */
   2 /* $OpenLDAP: pkg/ldap/servers/slapd/passwd.c,v 1.128.2.10 2008/02/11 23:34:15 quanah Exp $ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 1998-2008 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
  61         assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
  62
  63         if( op->o_dn.bv_len == 0 ) {
  64                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD\n",
  65                         op->o_log_prefix, 0, 0, 0, 0 );
  66                 rs->sr_text = "only authenticated users may change passwords";
  67                 return LDAP_STRONG_AUTH_REQUIRED;
  68         }
  69
  70         qpw->rs_old.bv_len = 0;
  71         qpw->rs_old.bv_val = NULL;
  72         qpw->rs_new.bv_len = 0;
  73         qpw->rs_new.bv_val = NULL;
  74         qpw->rs_mods = NULL;
  75         qpw->rs_modtail = NULL;
  76
  77         rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id,
  78                 &qpw->rs_old, &qpw->rs_new, &rs->sr_text );
  79
  80         if ( !BER_BVISNULL( &id )) {
  81                 idNul = id.bv_val[id.bv_len];
  82                 id.bv_val[id.bv_len] = '\0';
  83         }
  84         if ( rs->sr_err == LDAP_SUCCESS && !BER_BVISEMPTY( &id ) ) {
  85                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD id=\"%s\"%s%s\n",
  86                         op->o_log_prefix, id.bv_val,
  87                         qpw->rs_old.bv_val ? " old" : "",
  88                         qpw->rs_new.bv_val ? " new" : "", 0 );
  89         } else {
  90                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD%s%s\n",
  91                         op->o_log_prefix,
  92                         qpw->rs_old.bv_val ? " old" : "",
  93                         qpw->rs_new.bv_val ? " new" : "", 0, 0 );
  94         }
  95
  96         if ( rs->sr_err != LDAP_SUCCESS ) {
  97                 if ( !BER_BVISNULL( &id ))
  98                         id.bv_val[id.bv_len] = idNul;
  99                 return rs->sr_err;
 100         }
 101
 102         if ( !BER_BVISEMPTY( &id ) ) {
 103                 rs->sr_err = dnPrettyNormal( NULL, &id, &op->o_req_dn,
 104                                 &op->o_req_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_bd = select_backend( &op->o_req_ndn, 1 );
 112
 113         } else {
 114                 ber_dupbv_x( &op->o_req_dn, &op->o_dn, op->o_tmpmemctx );
 115                 ber_dupbv_x( &op->o_req_ndn, &op->o_ndn, op->o_tmpmemctx );
 116                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 117                 op->o_bd = op->o_conn->c_authz_backend;
 118                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 119         }
 120
 121         if( op->o_bd == NULL ) {
 122                 if ( qpw->rs_old.bv_val != NULL ) {
 123                         rs->sr_text = "unwilling to verify old password";
 124                         rc = LDAP_UNWILLING_TO_PERFORM;
 125                         goto error_return;
 126                 }
 127
 128 #ifdef HAVE_CYRUS_SASL
 129                 rc = slap_sasl_setpass( op, rs );
 130 #else
 131                 rs->sr_text = "no authz backend";
 132                 rc = LDAP_OTHER;
 133 #endif
 134                 goto error_return;
 135         }
 136
 137         if ( op->o_req_ndn.bv_len == 0 ) {
 138                 rs->sr_text = "no password is associated with the Root DSE";
 139                 rc = LDAP_UNWILLING_TO_PERFORM;
 140                 goto error_return;
 141         }
 142
 143         /* If we've got a glued backend, check the real backend */
 144         op_be = op->o_bd;
 145         if ( SLAP_GLUE_INSTANCE( op->o_bd )) {
 146                 op->o_bd = select_backend( &op->o_req_ndn, 0 );
 147         }
 148
 149         if (backend_check_restrictions( op, rs,
 150                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 151                 rc = rs->sr_err;
 152                 goto error_return;
 153         }
 154
 155         /* check for referrals */
 156         if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 157                 rc = rs->sr_err;
 158                 goto error_return;
 159         }
 160
 161         /* This does not apply to multi-master case */
 162         if(!( !SLAP_SINGLE_SHADOW( op->o_bd ) || be_isupdate( op ))) {
 163                 /* we SHOULD return a referral in this case */
 164                 BerVarray defref = op->o_bd->be_update_refs
 165                         ? op->o_bd->be_update_refs : default_referral;
 166
 167                 if( defref != NULL ) {
 168                         rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
 169                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 170                         if(rs->sr_ref) {
 171                                 rs->sr_flags |= REP_REF_MUSTBEFREED;
 172                         } else {
 173                                 rs->sr_ref = defref;
 174                         }
 175                         rc = LDAP_REFERRAL;
 176                         goto error_return;
 177
 178                 }
 179
 180                 rs->sr_text = "shadow context; no update referral";
 181                 rc = LDAP_UNWILLING_TO_PERFORM;
 182                 goto error_return;
 183         }
 184
 185         /* generate a new password if none was provided */
 186         if ( qpw->rs_new.bv_len == 0 ) {
 187                 slap_passwd_generate( &qpw->rs_new );
 188                 if ( qpw->rs_new.bv_len ) {
 189                         rsp = slap_passwd_return( &qpw->rs_new );
 190                         freenewpw = 1;
 191                 }
 192         }
 193         if ( qpw->rs_new.bv_len == 0 ) {
 194                 rs->sr_text = "password generation failed";
 195                 rc = LDAP_OTHER;
 196                 goto error_return;
 197         }
 198
 199         op->o_bd = op_be;
 200
 201         /* Give the backend a chance to handle this itself */
 202         if ( op->o_bd->be_extended ) {
 203                 rs->sr_err = op->o_bd->be_extended( op, rs );
 204                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 205                         rs->sr_err != SLAP_CB_CONTINUE )
 206                 {
 207                         rc = rs->sr_err;
 208                         if ( rsp ) {
 209                                 rs->sr_rspdata = rsp;
 210                                 rsp = NULL;
 211                         }
 212                         goto error_return;
 213                 }
 214         }
 215
 216         /* The backend didn't handle it, so try it here */
 217         if( op->o_bd && !op->o_bd->be_modify ) {
 218                 rs->sr_text = "operation not supported for current user";
 219                 rc = LDAP_UNWILLING_TO_PERFORM;
 220                 goto error_return;
 221         }
 222
 223         if ( qpw->rs_old.bv_val != NULL ) {
 224                 Entry *e = NULL;
 225
 226                 rc = be_entry_get_rw( op, &op->o_req_ndn, NULL,
 227                         slap_schema.si_ad_userPassword, 0, &e );
 228                 if ( rc == LDAP_SUCCESS && e ) {
 229                         Attribute *a = attr_find( e->e_attrs,
 230                                 slap_schema.si_ad_userPassword );
 231                         if ( a )
 232                                 rc = slap_passwd_check( op, e, a, &qpw->rs_old, &rs->sr_text );
 233                         else
 234                                 rc = 1;
 235                         be_entry_release_r( op, e );
 236                         if ( rc == LDAP_SUCCESS )
 237                                 goto old_good;
 238                 }
 239                 rs->sr_text = "unwilling to verify old password";
 240                 rc = LDAP_UNWILLING_TO_PERFORM;
 241                 goto error_return;
 242         }
 243
 244 old_good:
 245         ml = ch_malloc( sizeof(Modifications) );
 246         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 247
 248         if ( default_passwd_hash ) {
 249                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 250                 hashes = default_passwd_hash;
 251         } else {
 252                 nhash = 1;
 253                 hashes = (char **)defhash;
 254         }
 255         ml->sml_numvals = nhash;
 256         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 257         for ( i=0; hashes[i]; i++ ) {
 258                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 259                 if ( hash.bv_len == 0 ) {
 260                         if ( !rs->sr_text ) {
 261                                 rs->sr_text = "password hash failed";
 262                         }
 263                         break;
 264                 }
 265                 ml->sml_values[i] = hash;
 266         }
 267         ml->sml_values[i].bv_val = NULL;
 268         ml->sml_nvalues = NULL;
 269         ml->sml_desc = slap_schema.si_ad_userPassword;
 270         ml->sml_type = ml->sml_desc->ad_cname;
 271         ml->sml_op = LDAP_MOD_REPLACE;
 272         ml->sml_flags = 0;
 273         ml->sml_next = qpw->rs_mods;
 274         qpw->rs_mods = ml;
 275
 276         if ( hashes[i] ) {
 277                 rs->sr_err = LDAP_OTHER;
 278
 279         } else {
 280                 slap_callback *sc = op->o_callback;
 281
 282                 op->o_tag = LDAP_REQ_MODIFY;
 283                 op->o_callback = &cb;
 284                 op->orm_modlist = qpw->rs_mods;
 285                 op->orm_no_opattrs = 0;
 286
 287                 cb.sc_private = qpw;    /* let Modify know this was pwdMod,
 288                                          * if it cares... */
 289
 290                 rs->sr_err = op->o_bd->be_modify( op, rs );
 291
 292                 /* be_modify() might have shuffled modifications */
 293                 qpw->rs_mods = op->orm_modlist;
 294
 295                 if ( rs->sr_err == LDAP_SUCCESS ) {
 296                         rs->sr_rspdata = rsp;
 297
 298                 } else if ( rsp ) {
 299                         ber_bvfree( rsp );
 300                         rsp = NULL;
 301                 }
 302                 op->o_tag = LDAP_REQ_EXTENDED;
 303                 op->o_callback = sc;
 304         }
 305
 306         rc = rs->sr_err;
 307         op->oq_extended = qext;
 308
 309 error_return:;
 310         if ( qpw->rs_mods ) {
 311                 slap_mods_free( qpw->rs_mods, 1 );
 312         }
 313         if ( freenewpw ) {
 314                 free( qpw->rs_new.bv_val );
 315         }
 316         if ( !BER_BVISNULL( &op->o_req_dn ) ) {
 317                 op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 318                 BER_BVZERO( &op->o_req_dn );
 319         }
 320         if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
 321                 op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 322                 BER_BVZERO( &op->o_req_ndn );
 323         }
 324
 325         return rc;
 326 }
 327
 328 /* NOTE: The DN in *id is NOT NUL-terminated here. dnNormalize will
 329  * reject it in this condition, the caller must NUL-terminate it.
 330  * FIXME: should dnNormalize still be complaining about that?
 331  */
 332 int slap_passwd_parse( struct berval *reqdata,
 333         struct berval *id,
 334         struct berval *oldpass,
 335         struct berval *newpass,
 336         const char **text )
 337 {
 338         int rc = LDAP_SUCCESS;
 339         ber_tag_t tag;
 340         ber_len_t len = -1;
 341         BerElementBuffer berbuf;
 342         BerElement *ber = (BerElement *)&berbuf;
 343
 344         if( reqdata == NULL ) {
 345                 return LDAP_SUCCESS;
 346         }
 347
 348         if( reqdata->bv_len == 0 ) {
 349                 *text = "empty request data field";
 350                 return LDAP_PROTOCOL_ERROR;
 351         }
 352
 353         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 354         ber_init2( ber, reqdata, 0 );
 355
 356         tag = ber_skip_tag( ber, &len );
 357
 358         if( tag != LBER_SEQUENCE ) {
 359                 Debug( LDAP_DEBUG_TRACE,
 360                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 361                 rc = LDAP_PROTOCOL_ERROR;
 362                 goto done;
 363         }
 364
 365         tag = ber_peek_tag( ber, &len );
 366         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 367                 if( id == NULL ) {
 368                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 369                                 0, 0, 0 );
 370
 371                         *text = "user must change own password";
 372                         rc = LDAP_UNWILLING_TO_PERFORM;
 373                         goto done;
 374                 }
 375
 376                 tag = ber_get_stringbv( ber, id, LBER_BV_NOTERM );
 377
 378                 if( tag == LBER_ERROR ) {
 379                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 380                                 0, 0, 0 );
 381
 382                         goto decoding_error;
 383                 }
 384
 385                 tag = ber_peek_tag( ber, &len );
 386         }
 387
 388         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 389                 if( oldpass == NULL ) {
 390                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 391                                 0, 0, 0 );
 392
 393                         *text = "use bind to verify old password";
 394                         rc = LDAP_UNWILLING_TO_PERFORM;
 395                         goto done;
 396                 }
 397
 398                 tag = ber_get_stringbv( ber, oldpass, LBER_BV_NOTERM );
 399
 400                 if( tag == LBER_ERROR ) {
 401                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 402                                 0, 0, 0 );
 403
 404                         goto decoding_error;
 405                 }
 406
 407                 if( oldpass->bv_len == 0 ) {
 408                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n",
 409                                 0, 0, 0 );
 410
 411                         *text = "old password value is empty";
 412                         rc = LDAP_UNWILLING_TO_PERFORM;
 413                         goto done;
 414                 }
 415
 416                 tag = ber_peek_tag( ber, &len );
 417         }
 418
 419         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 420                 if( newpass == NULL ) {
 421                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 422                                 0, 0, 0 );
 423
 424                         *text = "user specified passwords disallowed";
 425                         rc = LDAP_UNWILLING_TO_PERFORM;
 426                         goto done;
 427                 }
 428
 429                 tag = ber_get_stringbv( ber, newpass, LBER_BV_NOTERM );
 430
 431                 if( tag == LBER_ERROR ) {
 432                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
 433                                 0, 0, 0 );
 434
 435                         goto decoding_error;
 436                 }
 437
 438                 if( newpass->bv_len == 0 ) {
 439                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n",
 440                                 0, 0, 0 );
 441
 442                         *text = "new password value is empty";
 443                         rc = LDAP_UNWILLING_TO_PERFORM;
 444                         goto done;
 445                 }
 446
 447                 tag = ber_peek_tag( ber, &len );
 448         }
 449
 450         if( len != 0 ) {
 451 decoding_error:
 452                 Debug( LDAP_DEBUG_TRACE,
 453                         "slap_passwd_parse: decoding error, len=%ld\n",
 454                         (long) len, 0, 0 );
 455
 456                 *text = "data decoding error";
 457                 rc = LDAP_PROTOCOL_ERROR;
 458         }
 459
 460 done:
 461         return rc;
 462 }
 463
 464 struct berval * slap_passwd_return(
 465         struct berval           *cred )
 466 {
 467         int rc;
 468         struct berval *bv = NULL;
 469         BerElementBuffer berbuf;
 470         /* opaque structure, size unknown but smaller than berbuf */
 471         BerElement *ber = (BerElement *)&berbuf;
 472
 473         assert( cred != NULL );
 474
 475         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 476                 (long) cred->bv_len, 0, 0 );
 477
 478         ber_init_w_nullc( ber, LBER_USE_DER );
 479
 480         rc = ber_printf( ber, "{tON}",
 481                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 482
 483         if( rc >= 0 ) {
 484                 (void) ber_flatten( ber, &bv );
 485         }
 486
 487         ber_free_buf( ber );
 488
 489         return bv;
 490 }
 491
 492 /*
 493  * if "e" is provided, access to each value of the password is checked first
 494  */
 495 int
 496 slap_passwd_check(
 497         Operation       *op,
 498         Entry           *e,
 499         Attribute       *a,
 500         struct berval   *cred,
 501         const char      **text )
 502 {
 503         int                     result = 1;
 504         struct berval           *bv;
 505         AccessControlState      acl_state = ACL_STATE_INIT;
 506
 507 #ifdef SLAPD_SPASSWD
 508         void            *old_authctx = NULL;
 509
 510         ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind,
 511                 op->o_conn->c_sasl_authctx, 0, &old_authctx, NULL );
 512 #endif
 513
 514         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 515                 /* if e is provided, check access */
 516                 if ( e && access_allowed( op, e, a->a_desc, bv,
 517                                         ACL_AUTH, &acl_state ) == 0 )
 518                 {
 519                         continue;
 520                 }
 521
 522                 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
 523                         result = 0;
 524                         break;
 525                 }
 526         }
 527
 528 #ifdef SLAPD_SPASSWD
 529         ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind,
 530                 old_authctx, 0, NULL, NULL );
 531 #endif
 532
 533         return result;
 534 }
 535
 536 void
 537 slap_passwd_generate( struct berval *pass )
 538 {
 539         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 540         BER_BVZERO( pass );
 541
 542         /*
 543          * generate passwords of only 8 characters as some getpass(3)
 544          * implementations truncate at 8 characters.
 545          */
 546         lutil_passwd_generate( pass, 8 );
 547 }
 548
 549 void
 550 slap_passwd_hash_type(
 551         struct berval * cred,
 552         struct berval * new,
 553         char *hash,
 554         const char **text )
 555 {
 556         new->bv_len = 0;
 557         new->bv_val = NULL;
 558
 559         assert( hash != NULL );
 560
 561         lutil_passwd_hash( cred , hash, new, text );
 562 }
 563 void
 564 slap_passwd_hash(
 565         struct berval * cred,
 566         struct berval * new,
 567         const char **text )
 568 {
 569         char *hash = NULL;
 570         if ( default_passwd_hash ) {
 571                 hash = default_passwd_hash[0];
 572         }
 573         if ( !hash ) {
 574                 hash = (char *)defhash[0];
 575         }
 576
 577         slap_passwd_hash_type( cred, new, hash, text );
 578 }
 579
 580 #ifdef SLAPD_CRYPT
 581 static ldap_pvt_thread_mutex_t passwd_mutex;
 582 static lutil_cryptfunc slapd_crypt;
 583
 584 static int slapd_crypt( const char *key, const char *salt, char **hash )
 585 {
 586         char *cr;
 587         int rc;
 588
 589         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 590
 591         cr = crypt( key, salt );
 592         if ( cr == NULL || cr[0] == '\0' ) {
 593                 /* salt must have been invalid */
 594                 rc = LUTIL_PASSWD_ERR;
 595         } else {
 596                 if ( hash ) {
 597                         *hash = ber_strdup( cr );
 598                         rc = LUTIL_PASSWD_OK;
 599
 600                 } else {
 601                         rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 602                 }
 603         }
 604
 605         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 606         return rc;
 607 }
 608 #endif /* SLAPD_CRYPT */
 609
 610 void slap_passwd_init()
 611 {
 612 #ifdef SLAPD_CRYPT
 613         ldap_pvt_thread_mutex_init( &passwd_mutex );
 614         lutil_cryptptr = slapd_crypt;
 615 #endif
 616 }
 617