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 1998-2004 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
  53         cb2.sc_next = &cb;
  54
  55         assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
  56
  57         if( op->o_dn.bv_len == 0 ) {
  58                 rs->sr_text = "only authenticated users may change passwords";
  59                 return LDAP_STRONG_AUTH_REQUIRED;
  60         }
  61
  62         qpw->rs_old.bv_val = NULL;
  63         qpw->rs_new.bv_val = NULL;
  64         qpw->rs_mods = NULL;
  65         qpw->rs_modtail = NULL;
  66
  67         rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id, &qpw->rs_old,
  68                 &qpw->rs_new, &rs->sr_text );
  69
  70         if ( rs->sr_err != LDAP_SUCCESS ) {
  71                 return rs->sr_err;
  72         }
  73
  74         if ( id.bv_len ) {
  75                 op->o_req_dn = id;
  76                 /* ndn is in tmpmem, so we don't need to free it */
  77                 rs->sr_err = dnNormalize( 0, NULL, NULL, &id, &op->o_req_ndn, op->o_tmpmemctx );
  78                 if ( rs->sr_err != LDAP_SUCCESS ) {
  79                         rs->sr_text = "Invalid DN";
  80                         return rs->sr_err;
  81                 }
  82                 op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
  83         } else {
  84                 op->o_req_dn = op->o_dn;
  85                 op->o_req_ndn = op->o_ndn;
  86                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
  87                 op->o_bd = op->o_conn->c_authz_backend;
  88                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
  89         }
  90
  91         if( op->o_bd == NULL ) {
  92 #ifdef HAVE_CYRUS_SASL
  93                 return slap_sasl_setpass( op, rs );
  94 #else
  95                 rs->sr_text = "no authz backend";
  96                 return LDAP_OTHER;
  97 #endif
  98         }
  99
 100         if ( op->o_req_ndn.bv_len == 0 ) {
 101                 rs->sr_text = "no password is associated with the Root DSE";
 102                 return LDAP_UNWILLING_TO_PERFORM;
 103         }
 104
 105         if (backend_check_restrictions( op, rs,
 106                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 107                 return rs->sr_err;
 108         }
 109
 110
 111 #ifndef SLAPD_MULTIMASTER
 112         /* This does not apply to multi-master case */
 113         if( op->o_bd->be_update_ndn.bv_len ) {
 114                 /* we SHOULD return a referral in this case */
 115                 BerVarray defref = NULL;
 116                 if ( !LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 117                         syncinfo_t *si;
 118                         LDAP_STAILQ_FOREACH( si, &op->o_bd->be_syncinfo, si_next ) {
 119                                 struct berval tmpbv;
 120                                 ber_dupbv( &tmpbv, &si->si_provideruri_bv[0] );
 121                                 ber_bvarray_add( &defref, &tmpbv );
 122                         }
 123                 } else {
 124                         defref = referral_rewrite( op->o_bd->be_update_refs,
 125                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 126                 }
 127                 rs->sr_ref = defref;
 128                 return LDAP_REFERRAL;
 129         }
 130 #endif /* !SLAPD_MULTIMASTER */
 131
 132         /* generate a new password if none was provided */
 133         if ( qpw->rs_new.bv_len == 0 ) {
 134                 slap_passwd_generate( &qpw->rs_new );
 135                 if ( qpw->rs_new.bv_len ) {
 136                         rsp = slap_passwd_return( &qpw->rs_new );
 137                 }
 138         }
 139         if ( qpw->rs_new.bv_len == 0 ) {
 140                 rs->sr_text = "password generation failed";
 141                 return LDAP_OTHER;
 142         }
 143
 144         /* Give the backend a chance to handle this itself */
 145         if ( op->o_bd->be_extended ) {
 146                 rs->sr_err = op->o_bd->be_extended( op, rs );
 147                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 148                         rs->sr_err != SLAP_CB_CONTINUE ) {
 149                         return rs->sr_err;
 150                 }
 151         }
 152
 153         /* The backend didn't handle it, so try it here */
 154         if( op->o_bd && !op->o_bd->be_modify ) {
 155                 rs->sr_text = "operation not supported for current user";
 156                 return LDAP_UNWILLING_TO_PERFORM;
 157         }
 158
 159         ml = ch_malloc( sizeof(Modifications) );
 160         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 161
 162         if ( default_passwd_hash ) {
 163                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 164                 hashes = default_passwd_hash;
 165         } else {
 166                 nhash = 1;
 167                 hashes = (char **)defhash;
 168         }
 169         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 170         for ( i=0; hashes[i]; i++ ) {
 171                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 172                 if ( hash.bv_len == 0 ) {
 173                         if ( !rs->sr_text ) {
 174                                 rs->sr_text = "password hash failed";
 175                         }
 176                         break;
 177                 }
 178                 ml->sml_values[i] = hash;
 179         }
 180         ml->sml_values[i].bv_val = NULL;
 181         ml->sml_nvalues = NULL;
 182         ml->sml_desc = slap_schema.si_ad_userPassword;
 183         ml->sml_op = qpw->rs_old.bv_val ? LDAP_MOD_ADD : LDAP_MOD_REPLACE;
 184         ml->sml_next = qpw->rs_mods;
 185         qpw->rs_mods = ml;
 186         if ( qpw->rs_old.bv_val ) {
 187                 ml = ch_malloc( sizeof(Modifications) );
 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_old, &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_desc = slap_schema.si_ad_userPassword;
 201                 ml->sml_op = LDAP_MOD_DELETE;
 202                 ml->sml_next = qpw->rs_mods;
 203                 qpw->rs_mods = ml;
 204         }
 205         if ( hashes[i] ) {
 206                 rs->sr_err = LDAP_OTHER;
 207         } else {
 208
 209                 op2 = *op;
 210                 op2.o_tag = LDAP_REQ_MODIFY;
 211                 op2.o_callback = &cb2;
 212                 op2.orm_modlist = qpw->rs_mods;
 213                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 214                                          * if it cares... */
 215
 216                 rs->sr_err = slap_mods_opattrs( &op2, ml, qpw->rs_modtail, &rs->sr_text,
 217                         NULL, 0 );
 218
 219                 if ( rs->sr_err == LDAP_SUCCESS ) {
 220                         rs->sr_err = op2.o_bd->be_modify( &op2, rs );
 221                 }
 222                 if ( rs->sr_err == LDAP_SUCCESS ) {
 223                         rs->sr_rspdata = rsp;
 224                 } else if ( rsp ) {
 225                         ber_bvfree( rsp );
 226                 }
 227         }
 228         slap_mods_free( qpw->rs_mods );
 229         if ( rsp ) {
 230                 free( qpw->rs_new.bv_val );
 231         }
 232
 233         return rs->sr_err;
 234 }
 235
 236 int slap_passwd_parse( struct berval *reqdata,
 237         struct berval *id,
 238         struct berval *oldpass,
 239         struct berval *newpass,
 240         const char **text )
 241 {
 242         int rc = LDAP_SUCCESS;
 243         ber_tag_t tag;
 244         ber_len_t len = -1;
 245         BerElementBuffer berbuf;
 246         BerElement *ber = (BerElement *)&berbuf;
 247
 248         if( reqdata == NULL ) {
 249                 return LDAP_SUCCESS;
 250         }
 251
 252         if( reqdata->bv_len == 0 ) {
 253                 *text = "empty request data field";
 254                 return LDAP_PROTOCOL_ERROR;
 255         }
 256
 257         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 258         ber_init2( ber, reqdata, 0 );
 259
 260         tag = ber_scanf( ber, "{" /*}*/ );
 261
 262         if( tag == LBER_ERROR ) {
 263 #ifdef NEW_LOGGING
 264                 LDAP_LOG( OPERATION, ERR,
 265                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 266 #else
 267                 Debug( LDAP_DEBUG_TRACE,
 268                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 269 #endif
 270                 rc = LDAP_PROTOCOL_ERROR;
 271                 goto done;
 272         }
 273
 274         tag = ber_peek_tag( ber, &len );
 275         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 276                 if( id == NULL ) {
 277 #ifdef NEW_LOGGING
 278                         LDAP_LOG( OPERATION, ERR,
 279                            "slap_passwd_parse: ID not allowed.\n", 0, 0, 0 );
 280 #else
 281                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 282                                 0, 0, 0 );
 283 #endif
 284
 285                         *text = "user must change own password";
 286                         rc = LDAP_UNWILLING_TO_PERFORM;
 287                         goto done;
 288                 }
 289
 290                 tag = ber_scanf( ber, "m", id );
 291
 292                 if( tag == LBER_ERROR ) {
 293 #ifdef NEW_LOGGING
 294                         LDAP_LOG( OPERATION, ERR,
 295                            "slap_passwd_parse:  ID parse failed.\n", 0, 0, 0 );
 296 #else
 297                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 298                                 0, 0, 0 );
 299 #endif
 300
 301                         goto decoding_error;
 302                 }
 303
 304                 tag = ber_peek_tag( ber, &len);
 305         }
 306
 307         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 308                 if( oldpass == NULL ) {
 309 #ifdef NEW_LOGGING
 310                         LDAP_LOG( OPERATION, ERR,
 311                            "slap_passwd_parse: OLD not allowed.\n" , 0, 0, 0 );
 312 #else
 313                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 314                                 0, 0, 0 );
 315 #endif
 316
 317                         *text = "use bind to verify old password";
 318                         rc = LDAP_UNWILLING_TO_PERFORM;
 319                         goto done;
 320                 }
 321
 322                 tag = ber_scanf( ber, "m", oldpass );
 323
 324                 if( tag == LBER_ERROR ) {
 325 #ifdef NEW_LOGGING
 326                         LDAP_LOG( OPERATION, ERR,
 327                            "slap_passwd_parse:  ID parse failed.\n" , 0, 0, 0 );
 328 #else
 329                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 330                                 0, 0, 0 );
 331 #endif
 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 #ifdef NEW_LOGGING
 342                         LDAP_LOG( OPERATION, ERR,
 343                            "slap_passwd_parse:  NEW not allowed.\n", 0, 0, 0 );
 344 #else
 345                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 346                                 0, 0, 0 );
 347 #endif
 348
 349                         *text = "user specified passwords disallowed";
 350                         rc = LDAP_UNWILLING_TO_PERFORM;
 351                         goto done;
 352                 }
 353
 354                 tag = ber_scanf( ber, "m", newpass );
 355
 356                 if( tag == LBER_ERROR ) {
 357 #ifdef NEW_LOGGING
 358                         LDAP_LOG( OPERATION, ERR,
 359                            "slap_passwd_parse:  OLD parse failed.\n", 0, 0, 0 );
 360 #else
 361                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 362                                 0, 0, 0 );
 363 #endif
 364
 365                         goto decoding_error;
 366                 }
 367
 368                 tag = ber_peek_tag( ber, &len );
 369         }
 370
 371         if( len != 0 ) {
 372 decoding_error:
 373 #ifdef NEW_LOGGING
 374                 LDAP_LOG( OPERATION, ERR,
 375                         "slap_passwd_parse: decoding error, len=%ld\n", (long)len, 0, 0 );
 376 #else
 377                 Debug( LDAP_DEBUG_TRACE,
 378                         "slap_passwd_parse: decoding error, len=%ld\n",
 379                         (long) len, 0, 0 );
 380 #endif
 381
 382                 *text = "data decoding error";
 383                 rc = LDAP_PROTOCOL_ERROR;
 384         }
 385
 386 done:
 387         return rc;
 388 }
 389
 390 struct berval * slap_passwd_return(
 391         struct berval           *cred )
 392 {
 393         int rc;
 394         struct berval *bv = NULL;
 395         BerElementBuffer berbuf;
 396         /* opaque structure, size unknown but smaller than berbuf */
 397         BerElement *ber = (BerElement *)&berbuf;
 398
 399         assert( cred != NULL );
 400
 401 #ifdef NEW_LOGGING
 402         LDAP_LOG( OPERATION, ENTRY,
 403                 "slap_passwd_return: %ld\n",(long)cred->bv_len, 0, 0 );
 404 #else
 405         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 406                 (long) cred->bv_len, 0, 0 );
 407 #endif
 408
 409         ber_init_w_nullc( ber, LBER_USE_DER );
 410
 411         rc = ber_printf( ber, "{tON}",
 412                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 413
 414         if( rc >= 0 ) {
 415                 (void) ber_flatten( ber, &bv );
 416         }
 417
 418         ber_free_buf( ber );
 419
 420         return bv;
 421 }
 422
 423 int
 424 slap_passwd_check(
 425         Connection *conn,
 426         Attribute *a,
 427         struct berval *cred,
 428         const char **text )
 429 {
 430         int result = 1;
 431         struct berval *bv;
 432
 433 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 434         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 435 #ifdef SLAPD_SPASSWD
 436         lutil_passwd_sasl_conn = conn->c_sasl_authctx;
 437 #endif
 438 #endif
 439
 440         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 441                 if( !lutil_passwd( bv, cred, NULL, text ) ) {
 442                         result = 0;
 443                         break;
 444                 }
 445         }
 446
 447 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 448 #ifdef SLAPD_SPASSWD
 449         lutil_passwd_sasl_conn = NULL;
 450 #endif
 451         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 452 #endif
 453
 454         return result;
 455 }
 456
 457 void
 458 slap_passwd_generate( struct berval *pass )
 459 {
 460 #ifdef NEW_LOGGING
 461         LDAP_LOG( OPERATION, ENTRY, "slap_passwd_generate: begin\n", 0, 0, 0 );
 462 #else
 463         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 464 #endif
 465         pass->bv_val = NULL;
 466         pass->bv_len = 0;
 467
 468         /*
 469          * generate passwords of only 8 characters as some getpass(3)
 470          * implementations truncate at 8 characters.
 471          */
 472         lutil_passwd_generate( pass, 8 );
 473 }
 474
 475 void
 476 slap_passwd_hash_type(
 477         struct berval * cred,
 478         struct berval * new,
 479         char *hash,
 480         const char **text )
 481 {
 482         new->bv_len = 0;
 483         new->bv_val = NULL;
 484
 485         assert( hash );
 486
 487 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 488         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 489 #endif
 490
 491         lutil_passwd_hash( cred , hash, new, text );
 492
 493 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 494         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 495 #endif
 496
 497 }
 498 void
 499 slap_passwd_hash(
 500         struct berval * cred,
 501         struct berval * new,
 502         const char **text )
 503 {
 504         char *hash = NULL;
 505         if ( default_passwd_hash ) {
 506                 hash = default_passwd_hash[0];
 507         }
 508         if ( !hash ) {
 509                 hash = (char *)defhash[0];
 510         }
 511
 512         slap_passwd_hash_type( cred, new, hash, text );
 513 }