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