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