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 1998-2005 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
  60         cb2.sc_next = &cb;
  61
  62         assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
  63
  64         if( op->o_dn.bv_len == 0 ) {
  65                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD\n",
  66                         op->o_log_prefix, 0, 0, 0, 0 );
  67                 rs->sr_text = "only authenticated users may change passwords";
  68                 return LDAP_STRONG_AUTH_REQUIRED;
  69         }
  70
  71         qpw->rs_old.bv_len = 0;
  72         qpw->rs_old.bv_val = NULL;
  73         qpw->rs_new.bv_len = 0;
  74         qpw->rs_new.bv_val = NULL;
  75         qpw->rs_mods = NULL;
  76         qpw->rs_modtail = NULL;
  77
  78         rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id,
  79                 &qpw->rs_old, &qpw->rs_new, &rs->sr_text );
  80
  81         if ( rs->sr_err == LDAP_SUCCESS && !BER_BVISEMPTY( &id ) ) {
  82                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD id=\"%s\"%s%s\n",
  83                         op->o_log_prefix, id.bv_val,
  84                         qpw->rs_old.bv_val ? " old" : "",
  85                         qpw->rs_new.bv_val ? " new" : "", 0 );
  86         } else {
  87                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD%s%s\n",
  88                         op->o_log_prefix,
  89                         qpw->rs_old.bv_val ? " old" : "",
  90                         qpw->rs_new.bv_val ? " new" : "", 0, 0 );
  91         }
  92
  93         if ( rs->sr_err != LDAP_SUCCESS ) {
  94                 return rs->sr_err;
  95         }
  96
  97         if ( !BER_BVISEMPTY( &id ) ) {
  98                 rs->sr_err = dnPrettyNormal( NULL, &id, &op->o_req_dn,
  99                                 &op->o_req_ndn, op->o_tmpmemctx );
 100                 if ( rs->sr_err != LDAP_SUCCESS ) {
 101                         rs->sr_text = "Invalid DN";
 102                         rc = rs->sr_err;
 103                         goto error_return;
 104                 }
 105                 op->o_bd = select_backend( &op->o_req_ndn, 0, 1 );
 106
 107         } else {
 108                 ber_dupbv_x( &op->o_req_dn, &op->o_dn, op->o_tmpmemctx );
 109                 ber_dupbv_x( &op->o_req_ndn, &op->o_ndn, op->o_tmpmemctx );
 110                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 111                 op->o_bd = op->o_conn->c_authz_backend;
 112                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 113         }
 114
 115         if( op->o_bd == NULL ) {
 116                 if ( qpw->rs_old.bv_val != NULL ) {
 117                         rs->sr_text = "unwilling to verify old password";
 118                         rc = LDAP_UNWILLING_TO_PERFORM;
 119                         goto error_return;
 120                 }
 121
 122 #ifdef HAVE_CYRUS_SASL
 123                 rc = slap_sasl_setpass( op, rs );
 124 #else
 125                 rs->sr_text = "no authz backend";
 126                 rc = LDAP_OTHER;
 127 #endif
 128                 goto error_return;
 129         }
 130
 131         if ( op->o_req_ndn.bv_len == 0 ) {
 132                 rs->sr_text = "no password is associated with the Root DSE";
 133                 rc = LDAP_UNWILLING_TO_PERFORM;
 134                 goto error_return;
 135         }
 136
 137         /* If we've got a glued backend, check the real backend */
 138         op_be = op->o_bd;
 139         if ( SLAP_GLUE_INSTANCE( op->o_bd )) {
 140                 op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
 141         }
 142
 143         if (backend_check_restrictions( op, rs,
 144                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 145                 rc = rs->sr_err;
 146                 goto error_return;
 147         }
 148
 149         /* check for referrals */
 150         if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 151                 rc = rs->sr_err;
 152                 goto error_return;
 153         }
 154
 155 #ifndef SLAPD_MULTIMASTER
 156         /* This does not apply to multi-master case */
 157         if(!( !SLAP_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 #endif /* !SLAPD_MULTIMASTER */
 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                 }
 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                         rc = rs->sr_err;
 202                         goto error_return;
 203                 }
 204         }
 205
 206         /* The backend didn't handle it, so try it here */
 207         if( op->o_bd && !op->o_bd->be_modify ) {
 208                 rs->sr_text = "operation not supported for current user";
 209                 rc = LDAP_UNWILLING_TO_PERFORM;
 210                 goto error_return;
 211         }
 212
 213         if ( qpw->rs_old.bv_val != NULL ) {
 214                 Entry *e = NULL;
 215
 216                 rc = be_entry_get_rw( op, &op->o_req_ndn, NULL,
 217                         slap_schema.si_ad_userPassword, 0, &e );
 218                 if ( rc == LDAP_SUCCESS && e ) {
 219                         Attribute *a = attr_find( e->e_attrs,
 220                                 slap_schema.si_ad_userPassword );
 221                         if ( a )
 222                                 rc = slap_passwd_check( op, e, a, &qpw->rs_old, &rs->sr_text );
 223                         else
 224                                 rc = 1;
 225                         be_entry_release_r( op, e );
 226                         if ( rc == LDAP_SUCCESS )
 227                                 goto old_good;
 228                 }
 229                 rs->sr_text = "unwilling to verify old password";
 230                 rc = LDAP_UNWILLING_TO_PERFORM;
 231                 goto error_return;
 232         }
 233
 234 old_good:
 235         ml = ch_malloc( sizeof(Modifications) );
 236         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 237
 238         if ( default_passwd_hash ) {
 239                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 240                 hashes = default_passwd_hash;
 241         } else {
 242                 nhash = 1;
 243                 hashes = (char **)defhash;
 244         }
 245         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 246         for ( i=0; hashes[i]; i++ ) {
 247                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 248                 if ( hash.bv_len == 0 ) {
 249                         if ( !rs->sr_text ) {
 250                                 rs->sr_text = "password hash failed";
 251                         }
 252                         break;
 253                 }
 254                 ml->sml_values[i] = hash;
 255         }
 256         ml->sml_values[i].bv_val = NULL;
 257         ml->sml_nvalues = NULL;
 258         ml->sml_desc = slap_schema.si_ad_userPassword;
 259         ml->sml_type = ml->sml_desc->ad_cname;
 260         ml->sml_op = LDAP_MOD_REPLACE;
 261         ml->sml_flags = 0;
 262         ml->sml_next = qpw->rs_mods;
 263         qpw->rs_mods = ml;
 264
 265         if ( hashes[i] ) {
 266                 rs->sr_err = LDAP_OTHER;
 267
 268         } else {
 269                 slap_callback *sc = op->o_callback;
 270
 271                 op->o_tag = LDAP_REQ_MODIFY;
 272                 op->o_callback = &cb2;
 273                 op->orm_modlist = qpw->rs_mods;
 274                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 275                                          * if it cares... */
 276
 277                 rs->sr_err = op->o_bd->be_modify( op, rs );
 278                 if ( rs->sr_err == LDAP_SUCCESS ) {
 279                         rs->sr_rspdata = rsp;
 280                 } else if ( rsp ) {
 281                         ber_bvfree( rsp );
 282                 }
 283                 op->o_tag = LDAP_REQ_EXTENDED;
 284                 op->o_callback = sc;
 285         }
 286         slap_mods_free( qpw->rs_mods, 1 );
 287         if ( rsp ) {
 288                 free( qpw->rs_new.bv_val );
 289         }
 290
 291         rc = rs->sr_err;
 292         op->oq_extended = qext;
 293
 294 error_return:;
 295         if ( !BER_BVISNULL( &op->o_req_dn ) ) {
 296                 op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 297                 BER_BVZERO( &op->o_req_dn );
 298         }
 299         if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
 300                 op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 301                 BER_BVZERO( &op->o_req_ndn );
 302         }
 303
 304         return rc;
 305 }
 306
 307 int slap_passwd_parse( struct berval *reqdata,
 308         struct berval *id,
 309         struct berval *oldpass,
 310         struct berval *newpass,
 311         const char **text )
 312 {
 313         int rc = LDAP_SUCCESS;
 314         ber_tag_t tag;
 315         ber_len_t len = -1;
 316         BerElementBuffer berbuf;
 317         BerElement *ber = (BerElement *)&berbuf;
 318
 319         if( reqdata == NULL ) {
 320                 return LDAP_SUCCESS;
 321         }
 322
 323         if( reqdata->bv_len == 0 ) {
 324                 *text = "empty request data field";
 325                 return LDAP_PROTOCOL_ERROR;
 326         }
 327
 328         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 329         ber_init2( ber, reqdata, 0 );
 330
 331         tag = ber_scanf( ber, "{" /*}*/ );
 332
 333         if( tag == LBER_ERROR ) {
 334                 Debug( LDAP_DEBUG_TRACE,
 335                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 336                 rc = LDAP_PROTOCOL_ERROR;
 337                 goto done;
 338         }
 339
 340         tag = ber_peek_tag( ber, &len );
 341         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 342                 if( id == NULL ) {
 343                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 344                                 0, 0, 0 );
 345
 346                         *text = "user must change own password";
 347                         rc = LDAP_UNWILLING_TO_PERFORM;
 348                         goto done;
 349                 }
 350
 351                 tag = ber_scanf( ber, "m", id );
 352
 353                 if( tag == LBER_ERROR ) {
 354                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 355                                 0, 0, 0 );
 356
 357                         goto decoding_error;
 358                 }
 359
 360                 tag = ber_peek_tag( ber, &len );
 361         }
 362
 363         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 364                 if( oldpass == NULL ) {
 365                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 366                                 0, 0, 0 );
 367
 368                         *text = "use bind to verify old password";
 369                         rc = LDAP_UNWILLING_TO_PERFORM;
 370                         goto done;
 371                 }
 372
 373                 tag = ber_scanf( ber, "m", oldpass );
 374
 375                 if( tag == LBER_ERROR ) {
 376                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 377                                 0, 0, 0 );
 378
 379                         goto decoding_error;
 380                 }
 381
 382                 if( oldpass->bv_len == 0 ) {
 383                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n",
 384                                 0, 0, 0 );
 385
 386                         *text = "old password value is empty";
 387                         rc = LDAP_UNWILLING_TO_PERFORM;
 388                         goto done;
 389                 }
 390
 391                 tag = ber_peek_tag( ber, &len );
 392         }
 393
 394         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 395                 if( newpass == NULL ) {
 396                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 397                                 0, 0, 0 );
 398
 399                         *text = "user specified passwords disallowed";
 400                         rc = LDAP_UNWILLING_TO_PERFORM;
 401                         goto done;
 402                 }
 403
 404                 tag = ber_scanf( ber, "m", newpass );
 405
 406                 if( tag == LBER_ERROR ) {
 407                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
 408                                 0, 0, 0 );
 409
 410                         goto decoding_error;
 411                 }
 412
 413                 if( newpass->bv_len == 0 ) {
 414                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n",
 415                                 0, 0, 0 );
 416
 417                         *text = "new password value is empty";
 418                         rc = LDAP_UNWILLING_TO_PERFORM;
 419                         goto done;
 420                 }
 421
 422                 tag = ber_peek_tag( ber, &len );
 423         }
 424
 425         if( len != 0 ) {
 426 decoding_error:
 427                 Debug( LDAP_DEBUG_TRACE,
 428                         "slap_passwd_parse: decoding error, len=%ld\n",
 429                         (long) len, 0, 0 );
 430
 431                 *text = "data decoding error";
 432                 rc = LDAP_PROTOCOL_ERROR;
 433         }
 434
 435 done:
 436         return rc;
 437 }
 438
 439 struct berval * slap_passwd_return(
 440         struct berval           *cred )
 441 {
 442         int rc;
 443         struct berval *bv = NULL;
 444         BerElementBuffer berbuf;
 445         /* opaque structure, size unknown but smaller than berbuf */
 446         BerElement *ber = (BerElement *)&berbuf;
 447
 448         assert( cred != NULL );
 449
 450         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 451                 (long) cred->bv_len, 0, 0 );
 452
 453         ber_init_w_nullc( ber, LBER_USE_DER );
 454
 455         rc = ber_printf( ber, "{tON}",
 456                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 457
 458         if( rc >= 0 ) {
 459                 (void) ber_flatten( ber, &bv );
 460         }
 461
 462         ber_free_buf( ber );
 463
 464         return bv;
 465 }
 466
 467 /*
 468  * if "e" is provided, access to each value of the password is checked first
 469  */
 470 int
 471 slap_passwd_check(
 472         Operation       *op,
 473         Entry           *e,
 474         Attribute       *a,
 475         struct berval   *cred,
 476         const char      **text )
 477 {
 478         int                     result = 1;
 479         struct berval           *bv;
 480         AccessControlState      acl_state = ACL_STATE_INIT;
 481
 482 #ifdef SLAPD_SPASSWD
 483         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 484                 op->o_conn->c_sasl_authctx, NULL );
 485 #endif
 486
 487         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 488                 /* if e is provided, check access */
 489                 if ( e && access_allowed( op, e, a->a_desc, bv,
 490                                         ACL_AUTH, &acl_state ) == 0 )
 491                 {
 492                         continue;
 493                 }
 494
 495                 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
 496                         result = 0;
 497                         break;
 498                 }
 499         }
 500
 501 #ifdef SLAPD_SPASSWD
 502         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 503                 NULL, NULL );
 504 #endif
 505
 506         return result;
 507 }
 508
 509 void
 510 slap_passwd_generate( struct berval *pass )
 511 {
 512         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 513         pass->bv_val = NULL;
 514         pass->bv_len = 0;
 515
 516         /*
 517          * generate passwords of only 8 characters as some getpass(3)
 518          * implementations truncate at 8 characters.
 519          */
 520         lutil_passwd_generate( pass, 8 );
 521 }
 522
 523 void
 524 slap_passwd_hash_type(
 525         struct berval * cred,
 526         struct berval * new,
 527         char *hash,
 528         const char **text )
 529 {
 530         new->bv_len = 0;
 531         new->bv_val = NULL;
 532
 533         assert( hash != NULL );
 534
 535         lutil_passwd_hash( cred , hash, new, text );
 536 }
 537 void
 538 slap_passwd_hash(
 539         struct berval * cred,
 540         struct berval * new,
 541         const char **text )
 542 {
 543         char *hash = NULL;
 544         if ( default_passwd_hash ) {
 545                 hash = default_passwd_hash[0];
 546         }
 547         if ( !hash ) {
 548                 hash = (char *)defhash[0];
 549         }
 550
 551         slap_passwd_hash_type( cred, new, hash, text );
 552 }
 553
 554 #ifdef SLAPD_CRYPT
 555 static ldap_pvt_thread_mutex_t passwd_mutex;
 556 static lutil_cryptfunc slapd_crypt;
 557
 558 static int slapd_crypt( const char *key, const char *salt, char **hash )
 559 {
 560         char *cr;
 561         int rc;
 562
 563         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 564
 565         cr = crypt( key, salt );
 566         if ( cr == NULL || cr[0] == '\0' ) {
 567                 /* salt must have been invalid */
 568                 rc = LUTIL_PASSWD_ERR;
 569         } else {
 570                 if ( hash ) {
 571                         *hash = ber_strdup( cr );
 572                         rc = LUTIL_PASSWD_OK;
 573
 574                 } else {
 575                         rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 576                 }
 577         }
 578
 579         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 580         return rc;
 581 }
 582 #endif /* SLAPD_CRYPT */
 583
 584 void slap_passwd_init()
 585 {
 586 #ifdef SLAPD_CRYPT
 587         ldap_pvt_thread_mutex_init( &passwd_mutex );
 588         lutil_cryptptr = slapd_crypt;
 589 #endif
 590 }
 591