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