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_val = NULL;
  72         qpw->rs_new.bv_val = NULL;
  73         qpw->rs_mods = NULL;
  74         qpw->rs_modtail = NULL;
  75
  76         rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id,
  77                 &qpw->rs_old, &qpw->rs_new, &rs->sr_text );
  78
  79         if ( rs->sr_err == LDAP_SUCCESS && !BER_BVISEMPTY( &id ) ) {
  80                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD id=\"%s\"%s%s\n",
  81                         op->o_log_prefix, id.bv_val,
  82                         qpw->rs_old.bv_val ? " old" : "",
  83                         qpw->rs_new.bv_val ? " new" : "", 0 );
  84         } else {
  85                 Statslog( LDAP_DEBUG_STATS, "%s PASSMOD\n",
  86                         op->o_log_prefix, 0, 0, 0, 0 );
  87         }
  88
  89         if ( rs->sr_err != LDAP_SUCCESS ) {
  90                 return rs->sr_err;
  91         }
  92
  93         if ( !BER_BVISEMPTY( &id ) ) {
  94                 rs->sr_err = dnPrettyNormal( NULL, &id, &op->o_req_dn,
  95                                 &op->o_req_ndn, op->o_tmpmemctx );
  96                 if ( rs->sr_err != LDAP_SUCCESS ) {
  97                         rs->sr_text = "Invalid DN";
  98                         rc = rs->sr_err;
  99                         goto error_return;
 100                 }
 101                 op->o_bd = select_backend( &op->o_req_ndn, 0, 1 );
 102
 103         } else {
 104                 ber_dupbv_x( &op->o_req_dn, &op->o_dn, op->o_tmpmemctx );
 105                 ber_dupbv_x( &op->o_req_ndn, &op->o_ndn, op->o_tmpmemctx );
 106                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 107                 op->o_bd = op->o_conn->c_authz_backend;
 108                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 109         }
 110
 111         if( op->o_bd == NULL ) {
 112                 if ( qpw->rs_old.bv_val != NULL ) {
 113                         rs->sr_text = "unwilling to verify old password";
 114                         rc = LDAP_UNWILLING_TO_PERFORM;
 115                         goto error_return;
 116                 }
 117
 118 #ifdef HAVE_CYRUS_SASL
 119                 rc = slap_sasl_setpass( op, rs );
 120 #else
 121                 rs->sr_text = "no authz backend";
 122                 rc = LDAP_OTHER;
 123 #endif
 124                 goto error_return;
 125         }
 126
 127         if ( op->o_req_ndn.bv_len == 0 ) {
 128                 rs->sr_text = "no password is associated with the Root DSE";
 129                 rc = LDAP_UNWILLING_TO_PERFORM;
 130                 goto error_return;
 131         }
 132
 133         /* If we've got a glued backend, check the real backend */
 134         op_be = op->o_bd;
 135         if ( SLAP_GLUE_INSTANCE( op->o_bd )) {
 136                 op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
 137         }
 138
 139         if (backend_check_restrictions( op, rs,
 140                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 141                 rc = rs->sr_err;
 142                 goto error_return;
 143         }
 144
 145         /* check for referrals */
 146         if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 147                 rc = rs->sr_err;
 148                 goto error_return;
 149         }
 150
 151 #ifndef SLAPD_MULTIMASTER
 152         /* This does not apply to multi-master case */
 153         if(!( !SLAP_SHADOW( op->o_bd ) || be_isupdate( op ))) {
 154                 /* we SHOULD return a referral in this case */
 155                 BerVarray defref = op->o_bd->be_update_refs
 156                         ? op->o_bd->be_update_refs : default_referral;
 157
 158                 if( defref != NULL ) {
 159                         rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
 160                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 161                         if(rs->sr_ref) {
 162                                 rs->sr_flags |= REP_REF_MUSTBEFREED;
 163                         } else {
 164                                 rs->sr_ref = defref;
 165                         }
 166                         rc = LDAP_REFERRAL;
 167                         goto error_return;
 168
 169                 }
 170
 171                 rs->sr_text = "shadow context; no update referral";
 172                 rc = LDAP_UNWILLING_TO_PERFORM;
 173                 goto error_return;
 174         }
 175 #endif /* !SLAPD_MULTIMASTER */
 176
 177         /* generate a new password if none was provided */
 178         if ( qpw->rs_new.bv_len == 0 ) {
 179                 slap_passwd_generate( &qpw->rs_new );
 180                 if ( qpw->rs_new.bv_len ) {
 181                         rsp = slap_passwd_return( &qpw->rs_new );
 182                 }
 183         }
 184         if ( qpw->rs_new.bv_len == 0 ) {
 185                 rs->sr_text = "password generation failed";
 186                 rc = LDAP_OTHER;
 187                 goto error_return;
 188         }
 189
 190         op->o_bd = op_be;
 191
 192         /* Give the backend a chance to handle this itself */
 193         if ( op->o_bd->be_extended ) {
 194                 rs->sr_err = op->o_bd->be_extended( op, rs );
 195                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 196                         rs->sr_err != SLAP_CB_CONTINUE ) {
 197                         rc = rs->sr_err;
 198                         goto error_return;
 199                 }
 200         }
 201
 202         /* The backend didn't handle it, so try it here */
 203         if( op->o_bd && !op->o_bd->be_modify ) {
 204                 rs->sr_text = "operation not supported for current user";
 205                 rc = LDAP_UNWILLING_TO_PERFORM;
 206                 goto error_return;
 207         }
 208
 209         if ( qpw->rs_old.bv_val != NULL ) {
 210                 rs->sr_text = "unwilling to verify old password";
 211                 rc = LDAP_UNWILLING_TO_PERFORM;
 212                 goto error_return;
 213         }
 214
 215         ml = ch_malloc( sizeof(Modifications) );
 216         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 217
 218         if ( default_passwd_hash ) {
 219                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 220                 hashes = default_passwd_hash;
 221         } else {
 222                 nhash = 1;
 223                 hashes = (char **)defhash;
 224         }
 225         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 226         for ( i=0; hashes[i]; i++ ) {
 227                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 228                 if ( hash.bv_len == 0 ) {
 229                         if ( !rs->sr_text ) {
 230                                 rs->sr_text = "password hash failed";
 231                         }
 232                         break;
 233                 }
 234                 ml->sml_values[i] = hash;
 235         }
 236         ml->sml_values[i].bv_val = NULL;
 237         ml->sml_nvalues = NULL;
 238         ml->sml_desc = slap_schema.si_ad_userPassword;
 239         ml->sml_op = LDAP_MOD_REPLACE;
 240         ml->sml_flags = 0;
 241         ml->sml_next = qpw->rs_mods;
 242         qpw->rs_mods = ml;
 243
 244         if ( hashes[i] ) {
 245                 rs->sr_err = LDAP_OTHER;
 246
 247         } else {
 248                 slap_callback *sc = op->o_callback;
 249
 250                 op->o_tag = LDAP_REQ_MODIFY;
 251                 op->o_callback = &cb2;
 252                 op->orm_modlist = qpw->rs_mods;
 253                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 254                                          * if it cares... */
 255
 256                 rs->sr_err = slap_mods_opattrs( op, ml, qpw->rs_modtail, &rs->sr_text,
 257                         NULL, 0, 1 );
 258
 259                 if ( rs->sr_err == LDAP_SUCCESS ) {
 260                         rs->sr_err = op->o_bd->be_modify( op, rs );
 261                 }
 262                 if ( rs->sr_err == LDAP_SUCCESS ) {
 263                         rs->sr_rspdata = rsp;
 264                 } else if ( rsp ) {
 265                         ber_bvfree( rsp );
 266                 }
 267                 op->o_tag = LDAP_REQ_EXTENDED;
 268                 op->o_callback = sc;
 269         }
 270         slap_mods_free( qpw->rs_mods, 1 );
 271         if ( rsp ) {
 272                 free( qpw->rs_new.bv_val );
 273         }
 274
 275         rc = rs->sr_err;
 276         op->oq_extended = qext;
 277
 278 error_return:;
 279         if ( !BER_BVISNULL( &op->o_req_dn ) ) {
 280                 op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 281         }
 282         if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
 283                 op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 284         }
 285
 286         return rc;
 287 }
 288
 289 int slap_passwd_parse( struct berval *reqdata,
 290         struct berval *id,
 291         struct berval *oldpass,
 292         struct berval *newpass,
 293         const char **text )
 294 {
 295         int rc = LDAP_SUCCESS;
 296         ber_tag_t tag;
 297         ber_len_t len = -1;
 298         BerElementBuffer berbuf;
 299         BerElement *ber = (BerElement *)&berbuf;
 300
 301         if( reqdata == NULL ) {
 302                 return LDAP_SUCCESS;
 303         }
 304
 305         if( reqdata->bv_len == 0 ) {
 306                 *text = "empty request data field";
 307                 return LDAP_PROTOCOL_ERROR;
 308         }
 309
 310         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 311         ber_init2( ber, reqdata, 0 );
 312
 313         tag = ber_scanf( ber, "{" /*}*/ );
 314
 315         if( tag == LBER_ERROR ) {
 316                 Debug( LDAP_DEBUG_TRACE,
 317                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 318                 rc = LDAP_PROTOCOL_ERROR;
 319                 goto done;
 320         }
 321
 322         tag = ber_peek_tag( ber, &len );
 323         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 324                 if( id == NULL ) {
 325                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 326                                 0, 0, 0 );
 327
 328                         *text = "user must change own password";
 329                         rc = LDAP_UNWILLING_TO_PERFORM;
 330                         goto done;
 331                 }
 332
 333                 tag = ber_scanf( ber, "m", id );
 334
 335                 if( tag == LBER_ERROR ) {
 336                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 337                                 0, 0, 0 );
 338
 339                         goto decoding_error;
 340                 }
 341
 342                 tag = ber_peek_tag( ber, &len );
 343         }
 344
 345         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 346                 if( oldpass == NULL ) {
 347                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 348                                 0, 0, 0 );
 349
 350                         *text = "use bind to verify old password";
 351                         rc = LDAP_UNWILLING_TO_PERFORM;
 352                         goto done;
 353                 }
 354
 355                 tag = ber_scanf( ber, "m", oldpass );
 356
 357                 if( tag == LBER_ERROR ) {
 358                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 359                                 0, 0, 0 );
 360
 361                         goto decoding_error;
 362                 }
 363
 364                 if( oldpass->bv_len == 0 ) {
 365                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n",
 366                                 0, 0, 0 );
 367
 368                         *text = "old password value is empty";
 369                         rc = LDAP_UNWILLING_TO_PERFORM;
 370                         goto done;
 371                 }
 372
 373                 tag = ber_peek_tag( ber, &len );
 374         }
 375
 376         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 377                 if( newpass == NULL ) {
 378                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 379                                 0, 0, 0 );
 380
 381                         *text = "user specified passwords disallowed";
 382                         rc = LDAP_UNWILLING_TO_PERFORM;
 383                         goto done;
 384                 }
 385
 386                 tag = ber_scanf( ber, "m", newpass );
 387
 388                 if( tag == LBER_ERROR ) {
 389                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
 390                                 0, 0, 0 );
 391
 392                         goto decoding_error;
 393                 }
 394
 395                 if( newpass->bv_len == 0 ) {
 396                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n",
 397                                 0, 0, 0 );
 398
 399                         *text = "new 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( len != 0 ) {
 408 decoding_error:
 409                 Debug( LDAP_DEBUG_TRACE,
 410                         "slap_passwd_parse: decoding error, len=%ld\n",
 411                         (long) len, 0, 0 );
 412
 413                 *text = "data decoding error";
 414                 rc = LDAP_PROTOCOL_ERROR;
 415         }
 416
 417 done:
 418         return rc;
 419 }
 420
 421 struct berval * slap_passwd_return(
 422         struct berval           *cred )
 423 {
 424         int rc;
 425         struct berval *bv = NULL;
 426         BerElementBuffer berbuf;
 427         /* opaque structure, size unknown but smaller than berbuf */
 428         BerElement *ber = (BerElement *)&berbuf;
 429
 430         assert( cred != NULL );
 431
 432         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 433                 (long) cred->bv_len, 0, 0 );
 434
 435         ber_init_w_nullc( ber, LBER_USE_DER );
 436
 437         rc = ber_printf( ber, "{tON}",
 438                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 439
 440         if( rc >= 0 ) {
 441                 (void) ber_flatten( ber, &bv );
 442         }
 443
 444         ber_free_buf( ber );
 445
 446         return bv;
 447 }
 448
 449 /*
 450  * if "e" is provided, access to each value of the password is checked first
 451  */
 452 int
 453 slap_passwd_check(
 454         Operation       *op,
 455         Entry           *e,
 456         Attribute       *a,
 457         struct berval   *cred,
 458         const char      **text )
 459 {
 460         int                     result = 1;
 461         struct berval           *bv;
 462         AccessControlState      acl_state = ACL_STATE_INIT;
 463
 464 #ifdef SLAPD_SPASSWD
 465         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 466                 op->o_conn->c_sasl_authctx, NULL );
 467 #endif
 468
 469         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 470                 /* if e is provided, check access */
 471                 if ( e && access_allowed( op, e, a->a_desc, bv,
 472                                         ACL_AUTH, &acl_state ) == 0 )
 473                 {
 474                         continue;
 475                 }
 476
 477                 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
 478                         result = 0;
 479                         break;
 480                 }
 481         }
 482
 483 #ifdef SLAPD_SPASSWD
 484         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 485                 NULL, NULL );
 486 #endif
 487
 488         return result;
 489 }
 490
 491 void
 492 slap_passwd_generate( struct berval *pass )
 493 {
 494         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 495         pass->bv_val = NULL;
 496         pass->bv_len = 0;
 497
 498         /*
 499          * generate passwords of only 8 characters as some getpass(3)
 500          * implementations truncate at 8 characters.
 501          */
 502         lutil_passwd_generate( pass, 8 );
 503 }
 504
 505 void
 506 slap_passwd_hash_type(
 507         struct berval * cred,
 508         struct berval * new,
 509         char *hash,
 510         const char **text )
 511 {
 512         new->bv_len = 0;
 513         new->bv_val = NULL;
 514
 515         assert( hash != NULL );
 516
 517         lutil_passwd_hash( cred , hash, new, text );
 518 }
 519 void
 520 slap_passwd_hash(
 521         struct berval * cred,
 522         struct berval * new,
 523         const char **text )
 524 {
 525         char *hash = NULL;
 526         if ( default_passwd_hash ) {
 527                 hash = default_passwd_hash[0];
 528         }
 529         if ( !hash ) {
 530                 hash = (char *)defhash[0];
 531         }
 532
 533         slap_passwd_hash_type( cred, new, hash, text );
 534 }
 535
 536 #ifdef SLAPD_CRYPT
 537 static ldap_pvt_thread_mutex_t passwd_mutex;
 538 static lutil_cryptfunc slapd_crypt;
 539
 540 static int slapd_crypt( const char *key, const char *salt, char **hash )
 541 {
 542         char *cr;
 543         int rc;
 544
 545         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 546
 547         cr = crypt( key, salt );
 548         if ( cr == NULL || cr[0] == '\0' ) {
 549                 /* salt must have been invalid */
 550                 rc = LUTIL_PASSWD_ERR;
 551         } else {
 552                 if ( hash ) {
 553                         *hash = ber_strdup( cr );
 554                         rc = LUTIL_PASSWD_OK;
 555
 556                 } else {
 557                         rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 558                 }
 559         }
 560
 561         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 562         return rc;
 563 }
 564 #endif /* SLAPD_CRYPT */
 565
 566 void slap_passwd_init()
 567 {
 568 #ifdef SLAPD_CRYPT
 569         ldap_pvt_thread_mutex_init( &passwd_mutex );
 570         lutil_cryptptr = slapd_crypt;
 571 #endif
 572 }
 573