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
  31 static const char *defhash[] = {
  32 #ifdef LUTIL_SHA1_BYTES
  33         "{SSHA}",
  34 #else
  35         "{SMD5}",
  36 #endif
  37         NULL
  38 };
  39
  40 int passwd_extop(
  41         Operation *op,
  42         SlapReply *rs )
  43 {
  44         struct berval id = {0, NULL}, hash, *rsp = NULL;
  45         req_pwdexop_s *qpw = &op->oq_pwdexop;
  46         Modifications *ml;
  47         Operation op2;
  48         slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
  49         slap_callback cb2 = { NULL, slap_replog_cb, NULL, NULL };
  50         int i, nhash;
  51         char **hashes;
  52         int     rc;
  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                 ber_dupbv_x( &op->o_req_dn, &id, op->o_tmpmemctx );
  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                         rc = rs->sr_err;
  82                         goto error_return;
  83                 }
  84                 op->o_bd = select_backend( &op->o_req_ndn, 0, 1 );
  85
  86         } else {
  87                 ber_dupbv_x( &op->o_req_dn, &op->o_dn, op->o_tmpmemctx );
  88                 ber_dupbv_x( &op->o_req_ndn, &op->o_ndn, op->o_tmpmemctx );
  89                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
  90                 op->o_bd = op->o_conn->c_authz_backend;
  91                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
  92         }
  93
  94         if( op->o_bd == NULL ) {
  95 #ifdef HAVE_CYRUS_SASL
  96                 rc = slap_sasl_setpass( op, rs );
  97 #else
  98                 rs->sr_text = "no authz backend";
  99                 rc = LDAP_OTHER;
 100 #endif
 101                 goto error_return;
 102         }
 103
 104         if ( op->o_req_ndn.bv_len == 0 ) {
 105                 rs->sr_text = "no password is associated with the Root DSE";
 106                 rc = LDAP_UNWILLING_TO_PERFORM;
 107                 goto error_return;
 108         }
 109
 110         if (backend_check_restrictions( op, rs,
 111                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 112                 rc = rs->sr_err;
 113                 goto error_return;
 114         }
 115
 116         /* check for referrals */
 117         if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 118                 rc = rs->sr_err;
 119                 goto error_return;
 120         }
 121
 122 #ifndef SLAPD_MULTIMASTER
 123         /* This does not apply to multi-master case */
 124         if(!( !SLAP_SHADOW( op->o_bd ) || be_isupdate( op ))) {
 125                 /* we SHOULD return a referral in this case */
 126                 BerVarray defref = op->o_bd->be_update_refs
 127                         ? op->o_bd->be_update_refs : default_referral;
 128
 129                 if( defref != NULL ) {
 130                         rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
 131                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 132                         if(rs->sr_ref) {
 133                                 rs->sr_flags |= REP_REF_MUSTBEFREED;
 134                         } else {
 135                                 rs->sr_ref = defref;
 136                         }
 137                         rc = LDAP_REFERRAL;
 138                         goto error_return;
 139
 140                 }
 141
 142                 rs->sr_text = "shadow context; no update referral";
 143                 rc = LDAP_UNWILLING_TO_PERFORM;
 144                 goto error_return;
 145         }
 146 #endif /* !SLAPD_MULTIMASTER */
 147
 148         /* generate a new password if none was provided */
 149         if ( qpw->rs_new.bv_len == 0 ) {
 150                 slap_passwd_generate( &qpw->rs_new );
 151                 if ( qpw->rs_new.bv_len ) {
 152                         rsp = slap_passwd_return( &qpw->rs_new );
 153                 }
 154         }
 155         if ( qpw->rs_new.bv_len == 0 ) {
 156                 rs->sr_text = "password generation failed";
 157                 rc = LDAP_OTHER;
 158                 goto error_return;
 159         }
 160
 161         /* Give the backend a chance to handle this itself */
 162         if ( op->o_bd->be_extended ) {
 163                 rs->sr_err = op->o_bd->be_extended( op, rs );
 164                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 165                         rs->sr_err != SLAP_CB_CONTINUE ) {
 166                         rc = rs->sr_err;
 167                         goto error_return;
 168                 }
 169         }
 170
 171         /* The backend didn't handle it, so try it here */
 172         if( op->o_bd && !op->o_bd->be_modify ) {
 173                 rs->sr_text = "operation not supported for current user";
 174                 rc = LDAP_UNWILLING_TO_PERFORM;
 175                 goto error_return;
 176         }
 177
 178         ml = ch_malloc( sizeof(Modifications) );
 179         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 180
 181         if ( default_passwd_hash ) {
 182                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 183                 hashes = default_passwd_hash;
 184         } else {
 185                 nhash = 1;
 186                 hashes = (char **)defhash;
 187         }
 188         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 189         for ( i=0; hashes[i]; i++ ) {
 190                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 191                 if ( hash.bv_len == 0 ) {
 192                         if ( !rs->sr_text ) {
 193                                 rs->sr_text = "password hash failed";
 194                         }
 195                         break;
 196                 }
 197                 ml->sml_values[i] = hash;
 198         }
 199         ml->sml_values[i].bv_val = NULL;
 200         ml->sml_nvalues = NULL;
 201         ml->sml_desc = slap_schema.si_ad_userPassword;
 202         ml->sml_op = LDAP_MOD_REPLACE;
 203         ml->sml_next = qpw->rs_mods;
 204         qpw->rs_mods = ml;
 205
 206         if ( hashes[i] ) {
 207                 rs->sr_err = LDAP_OTHER;
 208
 209         } else {
 210                 op2 = *op;
 211                 op2.o_tag = LDAP_REQ_MODIFY;
 212                 op2.o_callback = &cb2;
 213                 op2.orm_modlist = qpw->rs_mods;
 214                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 215                                          * if it cares... */
 216
 217                 rs->sr_err = slap_mods_opattrs( &op2, ml, qpw->rs_modtail, &rs->sr_text,
 218                         NULL, 0, 1 );
 219
 220                 if ( rs->sr_err == LDAP_SUCCESS ) {
 221                         rs->sr_err = op2.o_bd->be_modify( &op2, rs );
 222                         /* FIXME: in case it got rewritten... */
 223                         op->o_req_dn = op2.o_req_dn;
 224                         op->o_req_ndn = op2.o_req_ndn;
 225                 }
 226                 if ( rs->sr_err == LDAP_SUCCESS ) {
 227                         rs->sr_rspdata = rsp;
 228                 } else if ( rsp ) {
 229                         ber_bvfree( rsp );
 230                 }
 231         }
 232         slap_mods_free( qpw->rs_mods );
 233         if ( rsp ) {
 234                 free( qpw->rs_new.bv_val );
 235         }
 236
 237         rc = rs->sr_err;
 238
 239 error_return:;
 240         if ( !BER_BVISNULL( &op->o_req_dn ) ) {
 241                 op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 242         }
 243         if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
 244                 op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 245         }
 246
 247         return rc;
 248 }
 249
 250 int slap_passwd_parse( struct berval *reqdata,
 251         struct berval *id,
 252         struct berval *oldpass,
 253         struct berval *newpass,
 254         const char **text )
 255 {
 256         int rc = LDAP_SUCCESS;
 257         ber_tag_t tag;
 258         ber_len_t len = -1;
 259         BerElementBuffer berbuf;
 260         BerElement *ber = (BerElement *)&berbuf;
 261
 262         if( reqdata == NULL ) {
 263                 return LDAP_SUCCESS;
 264         }
 265
 266         if( reqdata->bv_len == 0 ) {
 267                 *text = "empty request data field";
 268                 return LDAP_PROTOCOL_ERROR;
 269         }
 270
 271         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 272         ber_init2( ber, reqdata, 0 );
 273
 274         tag = ber_scanf( ber, "{" /*}*/ );
 275
 276         if( tag == LBER_ERROR ) {
 277                 Debug( LDAP_DEBUG_TRACE,
 278                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 279                 rc = LDAP_PROTOCOL_ERROR;
 280                 goto done;
 281         }
 282
 283         tag = ber_peek_tag( ber, &len );
 284         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 285                 if( id == NULL ) {
 286                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 287                                 0, 0, 0 );
 288
 289                         *text = "user must change own password";
 290                         rc = LDAP_UNWILLING_TO_PERFORM;
 291                         goto done;
 292                 }
 293
 294                 tag = ber_scanf( ber, "m", id );
 295
 296                 if( tag == LBER_ERROR ) {
 297                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 298                                 0, 0, 0 );
 299
 300                         goto decoding_error;
 301                 }
 302
 303                 tag = ber_peek_tag( ber, &len);
 304         }
 305
 306         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 307                 if( oldpass == NULL ) {
 308                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 309                                 0, 0, 0 );
 310
 311                         *text = "use bind to verify old password";
 312                         rc = LDAP_UNWILLING_TO_PERFORM;
 313                         goto done;
 314                 }
 315
 316                 tag = ber_scanf( ber, "m", oldpass );
 317
 318                 if( tag == LBER_ERROR ) {
 319                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 320                                 0, 0, 0 );
 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                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 331                                 0, 0, 0 );
 332
 333                         *text = "user specified passwords disallowed";
 334                         rc = LDAP_UNWILLING_TO_PERFORM;
 335                         goto done;
 336                 }
 337
 338                 tag = ber_scanf( ber, "m", newpass );
 339
 340                 if( tag == LBER_ERROR ) {
 341                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
 342                                 0, 0, 0 );
 343
 344                         goto decoding_error;
 345                 }
 346
 347                 tag = ber_peek_tag( ber, &len );
 348         }
 349
 350         if( len != 0 ) {
 351 decoding_error:
 352                 Debug( LDAP_DEBUG_TRACE,
 353                         "slap_passwd_parse: decoding error, len=%ld\n",
 354                         (long) len, 0, 0 );
 355
 356                 *text = "data decoding error";
 357                 rc = LDAP_PROTOCOL_ERROR;
 358         }
 359
 360 done:
 361         return rc;
 362 }
 363
 364 struct berval * slap_passwd_return(
 365         struct berval           *cred )
 366 {
 367         int rc;
 368         struct berval *bv = NULL;
 369         BerElementBuffer berbuf;
 370         /* opaque structure, size unknown but smaller than berbuf */
 371         BerElement *ber = (BerElement *)&berbuf;
 372
 373         assert( cred != NULL );
 374
 375         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 376                 (long) cred->bv_len, 0, 0 );
 377
 378         ber_init_w_nullc( ber, LBER_USE_DER );
 379
 380         rc = ber_printf( ber, "{tON}",
 381                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 382
 383         if( rc >= 0 ) {
 384                 (void) ber_flatten( ber, &bv );
 385         }
 386
 387         ber_free_buf( ber );
 388
 389         return bv;
 390 }
 391
 392 /*
 393  * if "e" is provided, access to each value of the password is checked first
 394  */
 395 int
 396 slap_passwd_check(
 397         Operation       *op,
 398         Entry           *e,
 399         Attribute       *a,
 400         struct berval   *cred,
 401         const char      **text )
 402 {
 403         int                     result = 1;
 404         struct berval           *bv;
 405         AccessControlState      acl_state = ACL_STATE_INIT;
 406
 407 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 408         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 409 #ifdef SLAPD_SPASSWD
 410         lutil_passwd_sasl_conn = op->o_conn->c_sasl_authctx;
 411 #endif
 412 #endif
 413
 414         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 415                 /* if e is provided, check access */
 416                 if ( e && access_allowed( op, e, a->a_desc, bv,
 417                                         ACL_AUTH, &acl_state ) == 0 )
 418                 {
 419                         continue;
 420                 }
 421
 422                 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
 423                         result = 0;
 424                         break;
 425                 }
 426         }
 427
 428 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 429 #ifdef SLAPD_SPASSWD
 430         lutil_passwd_sasl_conn = NULL;
 431 #endif
 432         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 433 #endif
 434
 435         return result;
 436 }
 437
 438 void
 439 slap_passwd_generate( struct berval *pass )
 440 {
 441         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 442         pass->bv_val = NULL;
 443         pass->bv_len = 0;
 444
 445         /*
 446          * generate passwords of only 8 characters as some getpass(3)
 447          * implementations truncate at 8 characters.
 448          */
 449         lutil_passwd_generate( pass, 8 );
 450 }
 451
 452 void
 453 slap_passwd_hash_type(
 454         struct berval * cred,
 455         struct berval * new,
 456         char *hash,
 457         const char **text )
 458 {
 459         new->bv_len = 0;
 460         new->bv_val = NULL;
 461
 462         assert( hash );
 463
 464 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 465         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 466 #endif
 467
 468         lutil_passwd_hash( cred , hash, new, text );
 469
 470 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 471         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 472 #endif
 473
 474 }
 475 void
 476 slap_passwd_hash(
 477         struct berval * cred,
 478         struct berval * new,
 479         const char **text )
 480 {
 481         char *hash = NULL;
 482         if ( default_passwd_hash ) {
 483                 hash = default_passwd_hash[0];
 484         }
 485         if ( !hash ) {
 486                 hash = (char *)defhash[0];
 487         }
 488
 489         slap_passwd_hash_type( cred, new, hash, text );
 490 }