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 #ifdef HAVE_CYRUS_SASL
 113                 rc = slap_sasl_setpass( op, rs );
 114 #else
 115                 rs->sr_text = "no authz backend";
 116                 rc = LDAP_OTHER;
 117 #endif
 118                 goto error_return;
 119         }
 120
 121         if ( op->o_req_ndn.bv_len == 0 ) {
 122                 rs->sr_text = "no password is associated with the Root DSE";
 123                 rc = LDAP_UNWILLING_TO_PERFORM;
 124                 goto error_return;
 125         }
 126
 127         /* If we've got a glued backend, check the real backend */
 128         op_be = op->o_bd;
 129         if ( SLAP_GLUE_INSTANCE( op->o_bd )) {
 130                 op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
 131         }
 132
 133         if (backend_check_restrictions( op, rs,
 134                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 135                 rc = rs->sr_err;
 136                 goto error_return;
 137         }
 138
 139         /* check for referrals */
 140         if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 141                 rc = rs->sr_err;
 142                 goto error_return;
 143         }
 144
 145 #ifndef SLAPD_MULTIMASTER
 146         /* This does not apply to multi-master case */
 147         if(!( !SLAP_SHADOW( op->o_bd ) || be_isupdate( op ))) {
 148                 /* we SHOULD return a referral in this case */
 149                 BerVarray defref = op->o_bd->be_update_refs
 150                         ? op->o_bd->be_update_refs : default_referral;
 151
 152                 if( defref != NULL ) {
 153                         rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
 154                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 155                         if(rs->sr_ref) {
 156                                 rs->sr_flags |= REP_REF_MUSTBEFREED;
 157                         } else {
 158                                 rs->sr_ref = defref;
 159                         }
 160                         rc = LDAP_REFERRAL;
 161                         goto error_return;
 162
 163                 }
 164
 165                 rs->sr_text = "shadow context; no update referral";
 166                 rc = LDAP_UNWILLING_TO_PERFORM;
 167                 goto error_return;
 168         }
 169 #endif /* !SLAPD_MULTIMASTER */
 170
 171         /* generate a new password if none was provided */
 172         if ( qpw->rs_new.bv_len == 0 ) {
 173                 slap_passwd_generate( &qpw->rs_new );
 174                 if ( qpw->rs_new.bv_len ) {
 175                         rsp = slap_passwd_return( &qpw->rs_new );
 176                 }
 177         }
 178         if ( qpw->rs_new.bv_len == 0 ) {
 179                 rs->sr_text = "password generation failed";
 180                 rc = LDAP_OTHER;
 181                 goto error_return;
 182         }
 183
 184         op->o_bd = op_be;
 185
 186         /* Give the backend a chance to handle this itself */
 187         if ( op->o_bd->be_extended ) {
 188                 rs->sr_err = op->o_bd->be_extended( op, rs );
 189                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 190                         rs->sr_err != SLAP_CB_CONTINUE ) {
 191                         rc = rs->sr_err;
 192                         goto error_return;
 193                 }
 194         }
 195
 196         /* The backend didn't handle it, so try it here */
 197         if( op->o_bd && !op->o_bd->be_modify ) {
 198                 rs->sr_text = "operation not supported for current user";
 199                 rc = LDAP_UNWILLING_TO_PERFORM;
 200                 goto error_return;
 201         }
 202
 203         if ( qpw->rs_old.bv_val != NULL ) {
 204                 rs->sr_text = "unwilling to verify old password";
 205                 rc = LDAP_UNWILLING_TO_PERFORM;
 206                 goto error_return;
 207         }
 208
 209         ml = ch_malloc( sizeof(Modifications) );
 210         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 211
 212         if ( default_passwd_hash ) {
 213                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 214                 hashes = default_passwd_hash;
 215         } else {
 216                 nhash = 1;
 217                 hashes = (char **)defhash;
 218         }
 219         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 220         for ( i=0; hashes[i]; i++ ) {
 221                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 222                 if ( hash.bv_len == 0 ) {
 223                         if ( !rs->sr_text ) {
 224                                 rs->sr_text = "password hash failed";
 225                         }
 226                         break;
 227                 }
 228                 ml->sml_values[i] = hash;
 229         }
 230         ml->sml_values[i].bv_val = NULL;
 231         ml->sml_nvalues = NULL;
 232         ml->sml_desc = slap_schema.si_ad_userPassword;
 233         ml->sml_op = LDAP_MOD_REPLACE;
 234         ml->sml_flags = 0;
 235         ml->sml_next = qpw->rs_mods;
 236         qpw->rs_mods = ml;
 237
 238         if ( hashes[i] ) {
 239                 rs->sr_err = LDAP_OTHER;
 240
 241         } else {
 242                 slap_callback *sc = op->o_callback;
 243
 244                 op->o_tag = LDAP_REQ_MODIFY;
 245                 op->o_callback = &cb2;
 246                 op->orm_modlist = qpw->rs_mods;
 247                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 248                                          * if it cares... */
 249
 250                 rs->sr_err = slap_mods_opattrs( op, ml, qpw->rs_modtail, &rs->sr_text,
 251                         NULL, 0, 1 );
 252
 253                 if ( rs->sr_err == LDAP_SUCCESS ) {
 254                         rs->sr_err = op->o_bd->be_modify( op, rs );
 255                 }
 256                 if ( rs->sr_err == LDAP_SUCCESS ) {
 257                         rs->sr_rspdata = rsp;
 258                 } else if ( rsp ) {
 259                         ber_bvfree( rsp );
 260                 }
 261                 op->o_tag = LDAP_REQ_EXTENDED;
 262                 op->o_callback = sc;
 263         }
 264         slap_mods_free( qpw->rs_mods, 1 );
 265         if ( rsp ) {
 266                 free( qpw->rs_new.bv_val );
 267         }
 268
 269         rc = rs->sr_err;
 270         op->oq_extended = qext;
 271
 272 error_return:;
 273         if ( !BER_BVISNULL( &op->o_req_dn ) ) {
 274                 op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 275         }
 276         if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
 277                 op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 278         }
 279
 280         return rc;
 281 }
 282
 283 int slap_passwd_parse( struct berval *reqdata,
 284         struct berval *id,
 285         struct berval *oldpass,
 286         struct berval *newpass,
 287         const char **text )
 288 {
 289         int rc = LDAP_SUCCESS;
 290         ber_tag_t tag;
 291         ber_len_t len = -1;
 292         BerElementBuffer berbuf;
 293         BerElement *ber = (BerElement *)&berbuf;
 294
 295         if( reqdata == NULL ) {
 296                 return LDAP_SUCCESS;
 297         }
 298
 299         if( reqdata->bv_len == 0 ) {
 300                 *text = "empty request data field";
 301                 return LDAP_PROTOCOL_ERROR;
 302         }
 303
 304         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 305         ber_init2( ber, reqdata, 0 );
 306
 307         tag = ber_scanf( ber, "{" /*}*/ );
 308
 309         if( tag == LBER_ERROR ) {
 310                 Debug( LDAP_DEBUG_TRACE,
 311                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 312                 rc = LDAP_PROTOCOL_ERROR;
 313                 goto done;
 314         }
 315
 316         tag = ber_peek_tag( ber, &len );
 317         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 318                 if( id == NULL ) {
 319                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 320                                 0, 0, 0 );
 321
 322                         *text = "user must change own password";
 323                         rc = LDAP_UNWILLING_TO_PERFORM;
 324                         goto done;
 325                 }
 326
 327                 tag = ber_scanf( ber, "m", id );
 328
 329                 if( tag == LBER_ERROR ) {
 330                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 331                                 0, 0, 0 );
 332
 333                         goto decoding_error;
 334                 }
 335
 336                 tag = ber_peek_tag( ber, &len );
 337         }
 338
 339         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 340                 if( oldpass == NULL ) {
 341                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 342                                 0, 0, 0 );
 343
 344                         *text = "use bind to verify old password";
 345                         rc = LDAP_UNWILLING_TO_PERFORM;
 346                         goto done;
 347                 }
 348
 349                 tag = ber_scanf( ber, "m", oldpass );
 350
 351                 if( tag == LBER_ERROR ) {
 352                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 353                                 0, 0, 0 );
 354
 355                         goto decoding_error;
 356                 }
 357
 358                 if( oldpass->bv_len == 0 ) {
 359                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n",
 360                                 0, 0, 0 );
 361
 362                         *text = "old password value is empty";
 363                         rc = LDAP_UNWILLING_TO_PERFORM;
 364                         goto done;
 365                 }
 366
 367                 tag = ber_peek_tag( ber, &len );
 368         }
 369
 370         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 371                 if( newpass == NULL ) {
 372                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 373                                 0, 0, 0 );
 374
 375                         *text = "user specified passwords disallowed";
 376                         rc = LDAP_UNWILLING_TO_PERFORM;
 377                         goto done;
 378                 }
 379
 380                 tag = ber_scanf( ber, "m", newpass );
 381
 382                 if( tag == LBER_ERROR ) {
 383                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
 384                                 0, 0, 0 );
 385
 386                         goto decoding_error;
 387                 }
 388
 389                 if( newpass->bv_len == 0 ) {
 390                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n",
 391                                 0, 0, 0 );
 392
 393                         *text = "new password value is empty";
 394                         rc = LDAP_UNWILLING_TO_PERFORM;
 395                         goto done;
 396                 }
 397
 398                 tag = ber_peek_tag( ber, &len );
 399         }
 400
 401         if( len != 0 ) {
 402 decoding_error:
 403                 Debug( LDAP_DEBUG_TRACE,
 404                         "slap_passwd_parse: decoding error, len=%ld\n",
 405                         (long) len, 0, 0 );
 406
 407                 *text = "data decoding error";
 408                 rc = LDAP_PROTOCOL_ERROR;
 409         }
 410
 411 done:
 412         return rc;
 413 }
 414
 415 struct berval * slap_passwd_return(
 416         struct berval           *cred )
 417 {
 418         int rc;
 419         struct berval *bv = NULL;
 420         BerElementBuffer berbuf;
 421         /* opaque structure, size unknown but smaller than berbuf */
 422         BerElement *ber = (BerElement *)&berbuf;
 423
 424         assert( cred != NULL );
 425
 426         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 427                 (long) cred->bv_len, 0, 0 );
 428
 429         ber_init_w_nullc( ber, LBER_USE_DER );
 430
 431         rc = ber_printf( ber, "{tON}",
 432                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 433
 434         if( rc >= 0 ) {
 435                 (void) ber_flatten( ber, &bv );
 436         }
 437
 438         ber_free_buf( ber );
 439
 440         return bv;
 441 }
 442
 443 /*
 444  * if "e" is provided, access to each value of the password is checked first
 445  */
 446 int
 447 slap_passwd_check(
 448         Operation       *op,
 449         Entry           *e,
 450         Attribute       *a,
 451         struct berval   *cred,
 452         const char      **text )
 453 {
 454         int                     result = 1;
 455         struct berval           *bv;
 456         AccessControlState      acl_state = ACL_STATE_INIT;
 457
 458 #ifdef SLAPD_SPASSWD
 459         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 460                 op->o_conn->c_sasl_authctx, NULL );
 461 #endif
 462
 463         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 464                 /* if e is provided, check access */
 465                 if ( e && access_allowed( op, e, a->a_desc, bv,
 466                                         ACL_AUTH, &acl_state ) == 0 )
 467                 {
 468                         continue;
 469                 }
 470
 471                 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
 472                         result = 0;
 473                         break;
 474                 }
 475         }
 476
 477 #ifdef SLAPD_SPASSWD
 478         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 479                 NULL, NULL );
 480 #endif
 481
 482         return result;
 483 }
 484
 485 void
 486 slap_passwd_generate( struct berval *pass )
 487 {
 488         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 489         pass->bv_val = NULL;
 490         pass->bv_len = 0;
 491
 492         /*
 493          * generate passwords of only 8 characters as some getpass(3)
 494          * implementations truncate at 8 characters.
 495          */
 496         lutil_passwd_generate( pass, 8 );
 497 }
 498
 499 void
 500 slap_passwd_hash_type(
 501         struct berval * cred,
 502         struct berval * new,
 503         char *hash,
 504         const char **text )
 505 {
 506         new->bv_len = 0;
 507         new->bv_val = NULL;
 508
 509         assert( hash != NULL );
 510
 511         lutil_passwd_hash( cred , hash, new, text );
 512 }
 513 void
 514 slap_passwd_hash(
 515         struct berval * cred,
 516         struct berval * new,
 517         const char **text )
 518 {
 519         char *hash = NULL;
 520         if ( default_passwd_hash ) {
 521                 hash = default_passwd_hash[0];
 522         }
 523         if ( !hash ) {
 524                 hash = (char *)defhash[0];
 525         }
 526
 527         slap_passwd_hash_type( cred, new, hash, text );
 528 }
 529
 530 #ifdef SLAPD_CRYPT
 531 static ldap_pvt_thread_mutex_t passwd_mutex;
 532 static lutil_cryptfunc slapd_crypt;
 533
 534 static int slapd_crypt( const char *key, const char *salt, char **hash )
 535 {
 536         char *cr;
 537         int rc;
 538
 539         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 540
 541         cr = crypt( key, salt );
 542         if ( cr == NULL || cr[0] == '\0' ) {
 543                 /* salt must have been invalid */
 544                 rc = LUTIL_PASSWD_ERR;
 545         } else {
 546                 if ( hash ) {
 547                         *hash = ber_strdup( cr );
 548                         rc = LUTIL_PASSWD_OK;
 549
 550                 } else {
 551                         rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 552                 }
 553         }
 554
 555         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 556         return rc;
 557 }
 558 #endif /* SLAPD_CRYPT */
 559
 560 void slap_passwd_init()
 561 {
 562 #ifdef SLAPD_CRYPT
 563         ldap_pvt_thread_mutex_init( &passwd_mutex );
 564         lutil_cryptptr = slapd_crypt;
 565 #endif
 566 }
 567