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, &qpw->rs_old,
  77                 &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         ml = ch_malloc( sizeof(Modifications) );
 204         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 205
 206         if ( default_passwd_hash ) {
 207                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 208                 hashes = default_passwd_hash;
 209         } else {
 210                 nhash = 1;
 211                 hashes = (char **)defhash;
 212         }
 213         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 214         for ( i=0; hashes[i]; i++ ) {
 215                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 216                 if ( hash.bv_len == 0 ) {
 217                         if ( !rs->sr_text ) {
 218                                 rs->sr_text = "password hash failed";
 219                         }
 220                         break;
 221                 }
 222                 ml->sml_values[i] = hash;
 223         }
 224         ml->sml_values[i].bv_val = NULL;
 225         ml->sml_nvalues = NULL;
 226         ml->sml_desc = slap_schema.si_ad_userPassword;
 227         ml->sml_op = LDAP_MOD_REPLACE;
 228         ml->sml_flags = 0;
 229         ml->sml_managing = 0;
 230         ml->sml_next = qpw->rs_mods;
 231         qpw->rs_mods = ml;
 232
 233         if ( hashes[i] ) {
 234                 rs->sr_err = LDAP_OTHER;
 235
 236         } else {
 237                 slap_callback *sc = op->o_callback;
 238
 239                 op->o_tag = LDAP_REQ_MODIFY;
 240                 op->o_callback = &cb2;
 241                 op->orm_modlist = qpw->rs_mods;
 242                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 243                                          * if it cares... */
 244
 245                 rs->sr_err = slap_mods_opattrs( op, ml, qpw->rs_modtail, &rs->sr_text,
 246                         NULL, 0, 1 );
 247
 248                 if ( rs->sr_err == LDAP_SUCCESS ) {
 249                         rs->sr_err = op->o_bd->be_modify( op, rs );
 250                 }
 251                 if ( rs->sr_err == LDAP_SUCCESS ) {
 252                         rs->sr_rspdata = rsp;
 253                 } else if ( rsp ) {
 254                         ber_bvfree( rsp );
 255                 }
 256                 op->o_tag = LDAP_REQ_EXTENDED;
 257                 op->o_callback = sc;
 258         }
 259         slap_mods_free( qpw->rs_mods, 1 );
 260         if ( rsp ) {
 261                 free( qpw->rs_new.bv_val );
 262         }
 263
 264         rc = rs->sr_err;
 265         op->oq_extended = qext;
 266
 267 error_return:;
 268         if ( !BER_BVISNULL( &op->o_req_dn ) ) {
 269                 op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 270         }
 271         if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
 272                 op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 273         }
 274
 275         return rc;
 276 }
 277
 278 int slap_passwd_parse( struct berval *reqdata,
 279         struct berval *id,
 280         struct berval *oldpass,
 281         struct berval *newpass,
 282         const char **text )
 283 {
 284         int rc = LDAP_SUCCESS;
 285         ber_tag_t tag;
 286         ber_len_t len = -1;
 287         BerElementBuffer berbuf;
 288         BerElement *ber = (BerElement *)&berbuf;
 289
 290         if( reqdata == NULL ) {
 291                 return LDAP_SUCCESS;
 292         }
 293
 294         if( reqdata->bv_len == 0 ) {
 295                 *text = "empty request data field";
 296                 return LDAP_PROTOCOL_ERROR;
 297         }
 298
 299         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 300         ber_init2( ber, reqdata, 0 );
 301
 302         tag = ber_scanf( ber, "{" /*}*/ );
 303
 304         if( tag == LBER_ERROR ) {
 305                 Debug( LDAP_DEBUG_TRACE,
 306                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 307                 rc = LDAP_PROTOCOL_ERROR;
 308                 goto done;
 309         }
 310
 311         tag = ber_peek_tag( ber, &len );
 312         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 313                 if( id == NULL ) {
 314                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 315                                 0, 0, 0 );
 316
 317                         *text = "user must change own password";
 318                         rc = LDAP_UNWILLING_TO_PERFORM;
 319                         goto done;
 320                 }
 321
 322                 tag = ber_scanf( ber, "m", id );
 323
 324                 if( tag == LBER_ERROR ) {
 325                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 326                                 0, 0, 0 );
 327
 328                         goto decoding_error;
 329                 }
 330
 331                 tag = ber_peek_tag( ber, &len );
 332         }
 333
 334         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 335                 if( oldpass == NULL ) {
 336                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 337                                 0, 0, 0 );
 338
 339                         *text = "use bind to verify old password";
 340                         rc = LDAP_UNWILLING_TO_PERFORM;
 341                         goto done;
 342                 }
 343
 344                 tag = ber_scanf( ber, "m", oldpass );
 345
 346                 if( tag == LBER_ERROR ) {
 347                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 348                                 0, 0, 0 );
 349
 350                         goto decoding_error;
 351                 }
 352
 353                 tag = ber_peek_tag( ber, &len );
 354         }
 355
 356         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 357                 if( newpass == NULL ) {
 358                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 359                                 0, 0, 0 );
 360
 361                         *text = "user specified passwords disallowed";
 362                         rc = LDAP_UNWILLING_TO_PERFORM;
 363                         goto done;
 364                 }
 365
 366                 tag = ber_scanf( ber, "m", newpass );
 367
 368                 if( tag == LBER_ERROR ) {
 369                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
 370                                 0, 0, 0 );
 371
 372                         goto decoding_error;
 373                 }
 374
 375                 tag = ber_peek_tag( ber, &len );
 376         }
 377
 378         if( len != 0 ) {
 379 decoding_error:
 380                 Debug( LDAP_DEBUG_TRACE,
 381                         "slap_passwd_parse: decoding error, len=%ld\n",
 382                         (long) len, 0, 0 );
 383
 384                 *text = "data decoding error";
 385                 rc = LDAP_PROTOCOL_ERROR;
 386         }
 387
 388 done:
 389         return rc;
 390 }
 391
 392 struct berval * slap_passwd_return(
 393         struct berval           *cred )
 394 {
 395         int rc;
 396         struct berval *bv = NULL;
 397         BerElementBuffer berbuf;
 398         /* opaque structure, size unknown but smaller than berbuf */
 399         BerElement *ber = (BerElement *)&berbuf;
 400
 401         assert( cred != NULL );
 402
 403         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 404                 (long) cred->bv_len, 0, 0 );
 405
 406         ber_init_w_nullc( ber, LBER_USE_DER );
 407
 408         rc = ber_printf( ber, "{tON}",
 409                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 410
 411         if( rc >= 0 ) {
 412                 (void) ber_flatten( ber, &bv );
 413         }
 414
 415         ber_free_buf( ber );
 416
 417         return bv;
 418 }
 419
 420 /*
 421  * if "e" is provided, access to each value of the password is checked first
 422  */
 423 int
 424 slap_passwd_check(
 425         Operation       *op,
 426         Entry           *e,
 427         Attribute       *a,
 428         struct berval   *cred,
 429         const char      **text )
 430 {
 431         int                     result = 1;
 432         struct berval           *bv;
 433         AccessControlState      acl_state = ACL_STATE_INIT;
 434
 435 #ifdef SLAPD_SPASSWD
 436         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 437                 op->o_conn->c_sasl_authctx, NULL );
 438 #endif
 439
 440         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 441                 /* if e is provided, check access */
 442                 if ( e && access_allowed( op, e, a->a_desc, bv,
 443                                         ACL_AUTH, &acl_state ) == 0 )
 444                 {
 445                         continue;
 446                 }
 447
 448                 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
 449                         result = 0;
 450                         break;
 451                 }
 452         }
 453
 454 #ifdef SLAPD_SPASSWD
 455         ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
 456                 NULL, NULL );
 457 #endif
 458
 459         return result;
 460 }
 461
 462 void
 463 slap_passwd_generate( struct berval *pass )
 464 {
 465         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 466         pass->bv_val = NULL;
 467         pass->bv_len = 0;
 468
 469         /*
 470          * generate passwords of only 8 characters as some getpass(3)
 471          * implementations truncate at 8 characters.
 472          */
 473         lutil_passwd_generate( pass, 8 );
 474 }
 475
 476 void
 477 slap_passwd_hash_type(
 478         struct berval * cred,
 479         struct berval * new,
 480         char *hash,
 481         const char **text )
 482 {
 483         new->bv_len = 0;
 484         new->bv_val = NULL;
 485
 486         assert( hash != NULL );
 487
 488         lutil_passwd_hash( cred , hash, new, text );
 489 }
 490 void
 491 slap_passwd_hash(
 492         struct berval * cred,
 493         struct berval * new,
 494         const char **text )
 495 {
 496         char *hash = NULL;
 497         if ( default_passwd_hash ) {
 498                 hash = default_passwd_hash[0];
 499         }
 500         if ( !hash ) {
 501                 hash = (char *)defhash[0];
 502         }
 503
 504         slap_passwd_hash_type( cred, new, hash, text );
 505 }
 506
 507 #ifdef SLAPD_CRYPT
 508 static ldap_pvt_thread_mutex_t passwd_mutex;
 509 static lutil_cryptfunc slapd_crypt;
 510
 511 static int slapd_crypt( const char *key, const char *salt, char **hash )
 512 {
 513         char *cr;
 514         int rc;
 515
 516         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 517
 518         cr = crypt( key, salt );
 519         if ( cr == NULL || cr[0] == '\0' ) {
 520                 /* salt must have been invalid */
 521                 rc = LUTIL_PASSWD_ERR;
 522         } else {
 523                 if ( hash ) {
 524                         *hash = ber_strdup( cr );
 525                         rc = LUTIL_PASSWD_OK;
 526
 527                 } else {
 528                         rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 529                 }
 530         }
 531
 532         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 533         return rc;
 534 }
 535 #endif /* SLAPD_CRYPT */
 536
 537 void slap_passwd_init()
 538 {
 539 #ifdef SLAPD_CRYPT
 540         ldap_pvt_thread_mutex_init( &passwd_mutex );
 541         lutil_cryptptr = slapd_crypt;
 542 #endif
 543 }
 544