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