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 #include "slap.h"
  27
  28 #include <lber_pvt.h>
  29 #include <lutil.h>
  30 #include <lutil_sha1.h>
  31
  32 static const char *defhash[] = {
  33 #ifdef LUTIL_SHA1_BYTES
  34         "{SSHA}",
  35 #else
  36         "{SMD5}",
  37 #endif
  38         NULL
  39 };
  40
  41 int passwd_extop(
  42         Operation *op,
  43         SlapReply *rs )
  44 {
  45         struct berval id = {0, NULL}, hash, *rsp = NULL;
  46         req_pwdexop_s *qpw = &op->oq_pwdexop;
  47         req_extended_s qext = op->oq_extended;
  48         Modifications *ml;
  49         slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
  50         slap_callback cb2 = { NULL, slap_replog_cb, NULL, NULL };
  51         int i, nhash;
  52         char **hashes;
  53
  54         cb2.sc_next = &cb;
  55
  56         assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
  57
  58         if( op->o_dn.bv_len == 0 ) {
  59                 rs->sr_text = "only authenticated users may change passwords";
  60                 return LDAP_STRONG_AUTH_REQUIRED;
  61         }
  62
  63         qpw->rs_old.bv_val = NULL;
  64         qpw->rs_new.bv_val = NULL;
  65         qpw->rs_mods = NULL;
  66         qpw->rs_modtail = NULL;
  67
  68         rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id, &qpw->rs_old,
  69                 &qpw->rs_new, &rs->sr_text );
  70
  71         if ( rs->sr_err != LDAP_SUCCESS ) {
  72                 return rs->sr_err;
  73         }
  74
  75         if ( id.bv_len ) {
  76                 op->o_req_dn = id;
  77                 /* ndn is in tmpmem, so we don't need to free it */
  78                 rs->sr_err = dnNormalize( 0, NULL, NULL, &id, &op->o_req_ndn, op->o_tmpmemctx );
  79                 if ( rs->sr_err != LDAP_SUCCESS ) {
  80                         rs->sr_text = "Invalid DN";
  81                         return rs->sr_err;
  82                 }
  83                 op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
  84         } else {
  85                 op->o_req_dn = op->o_dn;
  86                 op->o_req_ndn = op->o_ndn;
  87                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
  88                 op->o_bd = op->o_conn->c_authz_backend;
  89                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
  90         }
  91
  92         if( op->o_bd == NULL ) {
  93 #ifdef HAVE_CYRUS_SASL
  94                 return slap_sasl_setpass( op, rs );
  95 #else
  96                 rs->sr_text = "no authz backend";
  97                 return LDAP_OTHER;
  98 #endif
  99         }
 100
 101         if ( op->o_req_ndn.bv_len == 0 ) {
 102                 rs->sr_text = "no password is associated with the Root DSE";
 103                 return LDAP_UNWILLING_TO_PERFORM;
 104         }
 105
 106         if (backend_check_restrictions( op, rs,
 107                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 108                 return rs->sr_err;
 109         }
 110
 111
 112 #ifndef SLAPD_MULTIMASTER
 113         /* This does not apply to multi-master case */
 114         if(!( !SLAP_SHADOW( op->o_bd ) || be_isupdate( op ))) {
 115                 /* we SHOULD return a referral in this case */
 116                 BerVarray defref = op->o_bd->be_update_refs
 117                         ? op->o_bd->be_update_refs : default_referral;
 118
 119                 if( defref != NULL ) {
 120                         rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
 121                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 122                         if(rs->sr_ref) {
 123                                 rs->sr_flags |= REP_REF_MUSTBEFREED;
 124                         } else {
 125                                 rs->sr_ref = defref;
 126                         }
 127                         return LDAP_REFERRAL;
 128
 129                 }
 130
 131                 rs->sr_text = "shadow context; no update referral";
 132                 return LDAP_UNWILLING_TO_PERFORM;
 133         }
 134 #endif /* !SLAPD_MULTIMASTER */
 135
 136         /* generate a new password if none was provided */
 137         if ( qpw->rs_new.bv_len == 0 ) {
 138                 slap_passwd_generate( &qpw->rs_new );
 139                 if ( qpw->rs_new.bv_len ) {
 140                         rsp = slap_passwd_return( &qpw->rs_new );
 141                 }
 142         }
 143         if ( qpw->rs_new.bv_len == 0 ) {
 144                 rs->sr_text = "password generation failed";
 145                 return LDAP_OTHER;
 146         }
 147
 148         /* Give the backend a chance to handle this itself */
 149         if ( op->o_bd->be_extended ) {
 150                 rs->sr_err = op->o_bd->be_extended( op, rs );
 151                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 152                         rs->sr_err != SLAP_CB_CONTINUE ) {
 153                         return rs->sr_err;
 154                 }
 155         }
 156
 157         /* The backend didn't handle it, so try it here */
 158         if( op->o_bd && !op->o_bd->be_modify ) {
 159                 rs->sr_text = "operation not supported for current user";
 160                 return LDAP_UNWILLING_TO_PERFORM;
 161         }
 162
 163         ml = ch_malloc( sizeof(Modifications) );
 164         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 165
 166         if ( default_passwd_hash ) {
 167                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 168                 hashes = default_passwd_hash;
 169         } else {
 170                 nhash = 1;
 171                 hashes = (char **)defhash;
 172         }
 173         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 174         for ( i=0; hashes[i]; i++ ) {
 175                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 176                 if ( hash.bv_len == 0 ) {
 177                         if ( !rs->sr_text ) {
 178                                 rs->sr_text = "password hash failed";
 179                         }
 180                         break;
 181                 }
 182                 ml->sml_values[i] = hash;
 183         }
 184         ml->sml_values[i].bv_val = NULL;
 185         ml->sml_nvalues = NULL;
 186         ml->sml_desc = slap_schema.si_ad_userPassword;
 187         ml->sml_op = LDAP_MOD_REPLACE;
 188         ml->sml_next = qpw->rs_mods;
 189         qpw->rs_mods = ml;
 190
 191         if ( hashes[i] ) {
 192                 rs->sr_err = LDAP_OTHER;
 193         } else {
 194                 slap_callback *sc = op->o_callback;
 195
 196                 op->o_tag = LDAP_REQ_MODIFY;
 197                 op->o_callback = &cb2;
 198                 op->orm_modlist = qpw->rs_mods;
 199                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 200                                          * if it cares... */
 201
 202                 rs->sr_err = slap_mods_opattrs( op, ml, qpw->rs_modtail, &rs->sr_text,
 203                         NULL, 0, 1 );
 204
 205                 if ( rs->sr_err == LDAP_SUCCESS ) {
 206                         rs->sr_err = op->o_bd->be_modify( op, rs );
 207                 }
 208                 if ( rs->sr_err == LDAP_SUCCESS ) {
 209                         rs->sr_rspdata = rsp;
 210                 } else if ( rsp ) {
 211                         ber_bvfree( rsp );
 212                 }
 213                 op->o_tag = LDAP_REQ_EXTENDED;
 214                 op->o_callback = sc;
 215         }
 216         slap_mods_free( qpw->rs_mods );
 217         if ( rsp ) {
 218                 free( qpw->rs_new.bv_val );
 219         }
 220
 221         op->oq_extended = qext;
 222         return rs->sr_err;
 223 }
 224
 225 int slap_passwd_parse( struct berval *reqdata,
 226         struct berval *id,
 227         struct berval *oldpass,
 228         struct berval *newpass,
 229         const char **text )
 230 {
 231         int rc = LDAP_SUCCESS;
 232         ber_tag_t tag;
 233         ber_len_t len = -1;
 234         BerElementBuffer berbuf;
 235         BerElement *ber = (BerElement *)&berbuf;
 236
 237         if( reqdata == NULL ) {
 238                 return LDAP_SUCCESS;
 239         }
 240
 241         if( reqdata->bv_len == 0 ) {
 242                 *text = "empty request data field";
 243                 return LDAP_PROTOCOL_ERROR;
 244         }
 245
 246         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 247         ber_init2( ber, reqdata, 0 );
 248
 249         tag = ber_scanf( ber, "{" /*}*/ );
 250
 251         if( tag == LBER_ERROR ) {
 252 #ifdef NEW_LOGGING
 253                 LDAP_LOG( OPERATION, ERR,
 254                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 255 #else
 256                 Debug( LDAP_DEBUG_TRACE,
 257                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 258 #endif
 259                 rc = LDAP_PROTOCOL_ERROR;
 260                 goto done;
 261         }
 262
 263         tag = ber_peek_tag( ber, &len );
 264         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 265                 if( id == NULL ) {
 266 #ifdef NEW_LOGGING
 267                         LDAP_LOG( OPERATION, ERR,
 268                            "slap_passwd_parse: ID not allowed.\n", 0, 0, 0 );
 269 #else
 270                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 271                                 0, 0, 0 );
 272 #endif
 273
 274                         *text = "user must change own password";
 275                         rc = LDAP_UNWILLING_TO_PERFORM;
 276                         goto done;
 277                 }
 278
 279                 tag = ber_scanf( ber, "m", id );
 280
 281                 if( tag == LBER_ERROR ) {
 282 #ifdef NEW_LOGGING
 283                         LDAP_LOG( OPERATION, ERR,
 284                            "slap_passwd_parse:  ID parse failed.\n", 0, 0, 0 );
 285 #else
 286                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 287                                 0, 0, 0 );
 288 #endif
 289
 290                         goto decoding_error;
 291                 }
 292
 293                 tag = ber_peek_tag( ber, &len);
 294         }
 295
 296         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 297                 if( oldpass == NULL ) {
 298 #ifdef NEW_LOGGING
 299                         LDAP_LOG( OPERATION, ERR,
 300                            "slap_passwd_parse: OLD not allowed.\n" , 0, 0, 0 );
 301 #else
 302                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 303                                 0, 0, 0 );
 304 #endif
 305
 306                         *text = "use bind to verify old password";
 307                         rc = LDAP_UNWILLING_TO_PERFORM;
 308                         goto done;
 309                 }
 310
 311                 tag = ber_scanf( ber, "m", oldpass );
 312
 313                 if( tag == LBER_ERROR ) {
 314 #ifdef NEW_LOGGING
 315                         LDAP_LOG( OPERATION, ERR,
 316                            "slap_passwd_parse:  ID parse failed.\n" , 0, 0, 0 );
 317 #else
 318                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 319                                 0, 0, 0 );
 320 #endif
 321
 322                         goto decoding_error;
 323                 }
 324
 325                 tag = ber_peek_tag( ber, &len );
 326         }
 327
 328         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 329                 if( newpass == NULL ) {
 330 #ifdef NEW_LOGGING
 331                         LDAP_LOG( OPERATION, ERR,
 332                            "slap_passwd_parse:  NEW not allowed.\n", 0, 0, 0 );
 333 #else
 334                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 335                                 0, 0, 0 );
 336 #endif
 337
 338                         *text = "user specified passwords disallowed";
 339                         rc = LDAP_UNWILLING_TO_PERFORM;
 340                         goto done;
 341                 }
 342
 343                 tag = ber_scanf( ber, "m", newpass );
 344
 345                 if( tag == LBER_ERROR ) {
 346 #ifdef NEW_LOGGING
 347                         LDAP_LOG( OPERATION, ERR,
 348                            "slap_passwd_parse:  OLD parse failed.\n", 0, 0, 0 );
 349 #else
 350                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 351                                 0, 0, 0 );
 352 #endif
 353
 354                         goto decoding_error;
 355                 }
 356
 357                 tag = ber_peek_tag( ber, &len );
 358         }
 359
 360         if( len != 0 ) {
 361 decoding_error:
 362 #ifdef NEW_LOGGING
 363                 LDAP_LOG( OPERATION, ERR,
 364                         "slap_passwd_parse: decoding error, len=%ld\n", (long)len, 0, 0 );
 365 #else
 366                 Debug( LDAP_DEBUG_TRACE,
 367                         "slap_passwd_parse: decoding error, len=%ld\n",
 368                         (long) len, 0, 0 );
 369 #endif
 370
 371                 *text = "data decoding error";
 372                 rc = LDAP_PROTOCOL_ERROR;
 373         }
 374
 375 done:
 376         return rc;
 377 }
 378
 379 struct berval * slap_passwd_return(
 380         struct berval           *cred )
 381 {
 382         int rc;
 383         struct berval *bv = NULL;
 384         BerElementBuffer berbuf;
 385         /* opaque structure, size unknown but smaller than berbuf */
 386         BerElement *ber = (BerElement *)&berbuf;
 387
 388         assert( cred != NULL );
 389
 390 #ifdef NEW_LOGGING
 391         LDAP_LOG( OPERATION, ENTRY,
 392                 "slap_passwd_return: %ld\n",(long)cred->bv_len, 0, 0 );
 393 #else
 394         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 395                 (long) cred->bv_len, 0, 0 );
 396 #endif
 397
 398         ber_init_w_nullc( ber, LBER_USE_DER );
 399
 400         rc = ber_printf( ber, "{tON}",
 401                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 402
 403         if( rc >= 0 ) {
 404                 (void) ber_flatten( ber, &bv );
 405         }
 406
 407         ber_free_buf( ber );
 408
 409         return bv;
 410 }
 411
 412 int
 413 slap_passwd_check(
 414         Connection *conn,
 415         Attribute *a,
 416         struct berval *cred,
 417         const char **text )
 418 {
 419         int result = 1;
 420         struct berval *bv;
 421
 422 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 423         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 424 #ifdef SLAPD_SPASSWD
 425         lutil_passwd_sasl_conn = conn->c_sasl_authctx;
 426 #endif
 427 #endif
 428
 429         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 430                 if( !lutil_passwd( bv, cred, NULL, text ) ) {
 431                         result = 0;
 432                         break;
 433                 }
 434         }
 435
 436 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 437 #ifdef SLAPD_SPASSWD
 438         lutil_passwd_sasl_conn = NULL;
 439 #endif
 440         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 441 #endif
 442
 443         return result;
 444 }
 445
 446 void
 447 slap_passwd_generate( struct berval *pass )
 448 {
 449 #ifdef NEW_LOGGING
 450         LDAP_LOG( OPERATION, ENTRY, "slap_passwd_generate: begin\n", 0, 0, 0 );
 451 #else
 452         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 453 #endif
 454         pass->bv_val = NULL;
 455         pass->bv_len = 0;
 456
 457         /*
 458          * generate passwords of only 8 characters as some getpass(3)
 459          * implementations truncate at 8 characters.
 460          */
 461         lutil_passwd_generate( pass, 8 );
 462 }
 463
 464 void
 465 slap_passwd_hash_type(
 466         struct berval * cred,
 467         struct berval * new,
 468         char *hash,
 469         const char **text )
 470 {
 471         new->bv_len = 0;
 472         new->bv_val = NULL;
 473
 474         assert( hash );
 475
 476 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 477         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 478 #endif
 479
 480         lutil_passwd_hash( cred , hash, new, text );
 481
 482 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 483         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 484 #endif
 485
 486 }
 487 void
 488 slap_passwd_hash(
 489         struct berval * cred,
 490         struct berval * new,
 491         const char **text )
 492 {
 493         char *hash = NULL;
 494         if ( default_passwd_hash ) {
 495                 hash = default_passwd_hash[0];
 496         }
 497         if ( !hash ) {
 498                 hash = (char *)defhash[0];
 499         }
 500
 501         slap_passwd_hash_type( cred, new, hash, text );
 502 }