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\n",
  88                         op->o_log_prefix, 0, 0, 0, 0 );
  89         }
  90
  91         if ( rs->sr_err != LDAP_SUCCESS ) {
  92                 return rs->sr_err;
  93         }
  94
  95         if ( !BER_BVISEMPTY( &id ) ) {
  96                 rs->sr_err = dnPrettyNormal( NULL, &id, &op->o_req_dn,
  97                                 &op->o_req_ndn, op->o_tmpmemctx );
  98                 if ( rs->sr_err != LDAP_SUCCESS ) {
  99                         rs->sr_text = "Invalid DN";
 100                         rc = rs->sr_err;
 101                         goto error_return;
 102                 }
 103                 op->o_bd = select_backend( &op->o_req_ndn, 0, 1 );
 104
 105         } else {
 106                 ber_dupbv_x( &op->o_req_dn, &op->o_dn, op->o_tmpmemctx );
 107                 ber_dupbv_x( &op->o_req_ndn, &op->o_ndn, op->o_tmpmemctx );
 108                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 109                 op->o_bd = op->o_conn->c_authz_backend;
 110                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 111         }
 112
 113         if( op->o_bd == NULL ) {
 114                 if ( qpw->rs_old.bv_val != NULL ) {
 115                         rs->sr_text = "unwilling to verify old password";
 116                         rc = LDAP_UNWILLING_TO_PERFORM;
 117                         goto error_return;
 118                 }
 119
 120 #ifdef HAVE_CYRUS_SASL
 121                 rc = slap_sasl_setpass( op, rs );
 122 #else
 123                 rs->sr_text = "no authz backend";
 124                 rc = LDAP_OTHER;
 125 #endif
 126                 goto error_return;
 127         }
 128
 129         if ( op->o_req_ndn.bv_len == 0 ) {
 130                 rs->sr_text = "no password is associated with the Root DSE";
 131                 rc = LDAP_UNWILLING_TO_PERFORM;
 132                 goto error_return;
 133         }
 134
 135         /* If we've got a glued backend, check the real backend */
 136         op_be = op->o_bd;
 137         if ( SLAP_GLUE_INSTANCE( op->o_bd )) {
 138                 op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
 139         }
 140
 141         if (backend_check_restrictions( op, rs,
 142                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 143                 rc = rs->sr_err;
 144                 goto error_return;
 145         }
 146
 147         /* check for referrals */
 148         if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 149                 rc = rs->sr_err;
 150                 goto error_return;
 151         }
 152
 153 #ifndef SLAPD_MULTIMASTER
 154         /* This does not apply to multi-master case */
 155         if(!( !SLAP_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 #endif /* !SLAPD_MULTIMASTER */
 178
 179         /* generate a new password if none was provided */
 180         if ( qpw->rs_new.bv_len == 0 ) {
 181                 slap_passwd_generate( &qpw->rs_new );
 182                 if ( qpw->rs_new.bv_len ) {
 183                         rsp = slap_passwd_return( &qpw->rs_new );
 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                         rc = rs->sr_err;
 200                         goto error_return;
 201                 }
 202         }
 203
 204         /* The backend didn't handle it, so try it here */
 205         if( op->o_bd && !op->o_bd->be_modify ) {
 206                 rs->sr_text = "operation not supported for current user";
 207                 rc = LDAP_UNWILLING_TO_PERFORM;
 208                 goto error_return;
 209         }
 210
 211         if ( qpw->rs_old.bv_val != NULL ) {
 212                 rs->sr_text = "unwilling to verify old password";
 213                 rc = LDAP_UNWILLING_TO_PERFORM;
 214                 goto error_return;
 215         }
 216
 217         ml = ch_malloc( sizeof(Modifications) );
 218         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 219
 220         if ( default_passwd_hash ) {
 221                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 222                 hashes = default_passwd_hash;
 223         } else {
 224                 nhash = 1;
 225                 hashes = (char **)defhash;
 226         }
 227         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 228         for ( i=0; hashes[i]; i++ ) {
 229                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 230                 if ( hash.bv_len == 0 ) {
 231                         if ( !rs->sr_text ) {
 232                                 rs->sr_text = "password hash failed";
 233                         }
 234                         break;
 235                 }
 236                 ml->sml_values[i] = hash;
 237         }
 238         ml->sml_values[i].bv_val = NULL;
 239         ml->sml_nvalues = NULL;
 240         ml->sml_desc = slap_schema.si_ad_userPassword;
 241         ml->sml_op = LDAP_MOD_REPLACE;
 242         ml->sml_flags = 0;
 243         ml->sml_next = qpw->rs_mods;
 244         qpw->rs_mods = ml;
 245
 246         if ( hashes[i] ) {
 247                 rs->sr_err = LDAP_OTHER;
 248
 249         } else {
 250                 slap_callback *sc = op->o_callback;
 251
 252                 op->o_tag = LDAP_REQ_MODIFY;
 253                 op->o_callback = &cb2;
 254                 op->orm_modlist = qpw->rs_mods;
 255                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 256                                          * if it cares... */
 257
 258                 rs->sr_err = slap_mods_opattrs( op, ml, qpw->rs_modtail, &rs->sr_text,
 259                         NULL, 0, 1 );
 260
 261                 if ( rs->sr_err == LDAP_SUCCESS ) {
 262                         rs->sr_err = op->o_bd->be_modify( op, rs );
 263                 }
 264                 if ( rs->sr_err == LDAP_SUCCESS ) {
 265                         rs->sr_rspdata = rsp;
 266                 } else if ( rsp ) {
 267                         ber_bvfree( rsp );
 268                 }
 269                 op->o_tag = LDAP_REQ_EXTENDED;
 270                 op->o_callback = sc;
 271         }
 272         slap_mods_free( qpw->rs_mods, 1 );
 273         if ( rsp ) {
 274                 free( qpw->rs_new.bv_val );
 275         }
 276
 277         rc = rs->sr_err;
 278         op->oq_extended = qext;
 279
 280 error_return:;
 281         if ( !BER_BVISNULL( &op->o_req_dn ) ) {
 282                 op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 283         }
 284         if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
 285                 op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 286         }
 287
 288         return rc;
 289 }
 290
 291 int slap_passwd_parse( struct berval *reqdata,
 292         struct berval *id,
 293         struct berval *oldpass,
 294         struct berval *newpass,
 295         const char **text )
 296 {
 297         int rc = LDAP_SUCCESS;
 298         ber_tag_t tag;
 299         ber_len_t len = -1;
 300         BerElementBuffer berbuf;
 301         BerElement *ber = (BerElement *)&berbuf;
 302
 303         if( reqdata == NULL ) {
 304                 return LDAP_SUCCESS;
 305         }
 306
 307         if( reqdata->bv_len == 0 ) {
 308                 *text = "empty request data field";
 309                 return LDAP_PROTOCOL_ERROR;
 310         }
 311
 312         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 313         ber_init2( ber, reqdata, 0 );
 314
 315         tag = ber_scanf( ber, "{" /*}*/ );
 316
 317         if( tag == LBER_ERROR ) {
 318                 Debug( LDAP_DEBUG_TRACE,
 319                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 320                 rc = LDAP_PROTOCOL_ERROR;
 321                 goto done;
 322         }
 323
 324         tag = ber_peek_tag( ber, &len );
 325         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 326                 if( id == NULL ) {
 327                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 328                                 0, 0, 0 );
 329
 330                         *text = "user must change own password";
 331                         rc = LDAP_UNWILLING_TO_PERFORM;
 332                         goto done;
 333                 }
 334
 335                 tag = ber_scanf( ber, "m", id );
 336
 337                 if( tag == LBER_ERROR ) {
 338                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 339                                 0, 0, 0 );
 340
 341                         goto decoding_error;
 342                 }
 343
 344                 tag = ber_peek_tag( ber, &len );
 345         }
 346
 347         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 348                 if( oldpass == NULL ) {
 349                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 350                                 0, 0, 0 );
 351
 352                         *text = "use bind to verify old password";
 353                         rc = LDAP_UNWILLING_TO_PERFORM;
 354                         goto done;
 355                 }
 356
 357                 tag = ber_scanf( ber, "m", oldpass );
 358
 359                 if( tag == LBER_ERROR ) {
 360                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 361                                 0, 0, 0 );
 362
 363                         goto decoding_error;
 364                 }
 365
 366                 if( oldpass->bv_len == 0 ) {
 367                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n",
 368                                 0, 0, 0 );
 369
 370                         *text = "old password value is empty";
 371                         rc = LDAP_UNWILLING_TO_PERFORM;
 372                         goto done;
 373                 }
 374
 375                 tag = ber_peek_tag( ber, &len );
 376         }
 377
 378         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 379                 if( newpass == NULL ) {
 380                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 381                                 0, 0, 0 );
 382
 383                         *text = "user specified passwords disallowed";
 384                         rc = LDAP_UNWILLING_TO_PERFORM;
 385                         goto done;
 386                 }
 387
 388                 tag = ber_scanf( ber, "m", newpass );
 389
 390                 if( tag == LBER_ERROR ) {
 391                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
 392                                 0, 0, 0 );
 393
 394                         goto decoding_error;
 395                 }
 396
 397                 if( newpass->bv_len == 0 ) {
 398                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n",
 399                                 0, 0, 0 );
 400
 401                         *text = "new password value is empty";
 402                         rc = LDAP_UNWILLING_TO_PERFORM;
 403                         goto done;
 404                 }
 405
 406                 tag = ber_peek_tag( ber, &len );
 407         }
 408
 409         if( len != 0 ) {
 410 decoding_error:
 411                 Debug( LDAP_DEBUG_TRACE,
 412                         "slap_passwd_parse: decoding error, len=%ld\n",
 413                         (long) len, 0, 0 );
 414
 415                 *text = "data decoding error";
 416                 rc = LDAP_PROTOCOL_ERROR;
 417         }
 418
 419 done:
 420         return rc;
 421 }
 422
 423 struct berval * slap_passwd_return(
 424         struct berval           *cred )
 425 {
 426         int rc;
 427         struct berval *bv = NULL;
 428         BerElementBuffer berbuf;
 429         /* opaque structure, size unknown but smaller than berbuf */
 430         BerElement *ber = (BerElement *)&berbuf;
 431
 432         assert( cred != NULL );
 433
 434         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 435                 (long) cred->bv_len, 0, 0 );
 436
 437         ber_init_w_nullc( ber, LBER_USE_DER );
 438
 439         rc = ber_printf( ber, "{tON}",
 440                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 441
 442         if( rc >= 0 ) {
 443                 (void) ber_flatten( ber, &bv );
 444         }
 445
 446         ber_free_buf( ber );
 447
 448         return bv;
 449 }
 450
 451 /*
 452  * if "e" is provided, access to each value of the password is checked first
 453  */
 454 int
 455 slap_passwd_check(
 456         Operation       *op,
 457         Entry           *e,
 458         Attribute       *a,
 459         struct berval   *cred,
 460         const char      **text )
 461 {
 462         int                     result = 1;
 463         struct berval           *bv;
 464         AccessControlState      acl_state = ACL_STATE_INIT;
 465
 466 #ifdef SLAPD_SPASSWD
 467         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 468                 op->o_conn->c_sasl_authctx, NULL );
 469 #endif
 470
 471         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 472                 /* if e is provided, check access */
 473                 if ( e && access_allowed( op, e, a->a_desc, bv,
 474                                         ACL_AUTH, &acl_state ) == 0 )
 475                 {
 476                         continue;
 477                 }
 478
 479                 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
 480                         result = 0;
 481                         break;
 482                 }
 483         }
 484
 485 #ifdef SLAPD_SPASSWD
 486         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 487                 NULL, NULL );
 488 #endif
 489
 490         return result;
 491 }
 492
 493 void
 494 slap_passwd_generate( struct berval *pass )
 495 {
 496         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 497         pass->bv_val = NULL;
 498         pass->bv_len = 0;
 499
 500         /*
 501          * generate passwords of only 8 characters as some getpass(3)
 502          * implementations truncate at 8 characters.
 503          */
 504         lutil_passwd_generate( pass, 8 );
 505 }
 506
 507 void
 508 slap_passwd_hash_type(
 509         struct berval * cred,
 510         struct berval * new,
 511         char *hash,
 512         const char **text )
 513 {
 514         new->bv_len = 0;
 515         new->bv_val = NULL;
 516
 517         assert( hash != NULL );
 518
 519         lutil_passwd_hash( cred , hash, new, text );
 520 }
 521 void
 522 slap_passwd_hash(
 523         struct berval * cred,
 524         struct berval * new,
 525         const char **text )
 526 {
 527         char *hash = NULL;
 528         if ( default_passwd_hash ) {
 529                 hash = default_passwd_hash[0];
 530         }
 531         if ( !hash ) {
 532                 hash = (char *)defhash[0];
 533         }
 534
 535         slap_passwd_hash_type( cred, new, hash, text );
 536 }
 537
 538 #ifdef SLAPD_CRYPT
 539 static ldap_pvt_thread_mutex_t passwd_mutex;
 540 static lutil_cryptfunc slapd_crypt;
 541
 542 static int slapd_crypt( const char *key, const char *salt, char **hash )
 543 {
 544         char *cr;
 545         int rc;
 546
 547         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 548
 549         cr = crypt( key, salt );
 550         if ( cr == NULL || cr[0] == '\0' ) {
 551                 /* salt must have been invalid */
 552                 rc = LUTIL_PASSWD_ERR;
 553         } else {
 554                 if ( hash ) {
 555                         *hash = ber_strdup( cr );
 556                         rc = LUTIL_PASSWD_OK;
 557
 558                 } else {
 559                         rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 560                 }
 561         }
 562
 563         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 564         return rc;
 565 }
 566 #endif /* SLAPD_CRYPT */
 567
 568 void slap_passwd_init()
 569 {
 570 #ifdef SLAPD_CRYPT
 571         ldap_pvt_thread_mutex_init( &passwd_mutex );
 572         lutil_cryptptr = slapd_crypt;
 573 #endif
 574 }
 575