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( hashes[i], &qpw->rs_new, &hash, &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 = LDAP_MOD_REPLACE;
 184         ml->sml_next = qpw->rs_mods;
 185         qpw->rs_mods = ml;
 186         if ( rsp ) {
 187                 free( qpw->rs_new.bv_val );
 188         }
 189         if ( hashes[i] ) {
 190                 rs->sr_err = LDAP_OTHER;
 191         } else {
 192
 193                 op2 = *op;
 194                 op2.o_tag = LDAP_REQ_MODIFY;
 195                 op2.o_callback = &cb2;
 196                 op2.orm_modlist = qpw->rs_mods;
 197
 198                 rs->sr_err = slap_mods_opattrs( &op2, ml, qpw->rs_modtail, &rs->sr_text,
 199                         NULL, 0 );
 200
 201                 if ( rs->sr_err == LDAP_SUCCESS ) {
 202                         rs->sr_err = op2.o_bd->be_modify( &op2, rs );
 203                 }
 204                 if ( rs->sr_err == LDAP_SUCCESS ) {
 205                         rs->sr_rspdata = rsp;
 206                 } else if ( rsp ) {
 207                         ber_bvfree( rsp );
 208                 }
 209         }
 210         slap_mods_free( qpw->rs_mods );
 211
 212         return rs->sr_err;
 213 }
 214
 215 int slap_passwd_parse( struct berval *reqdata,
 216         struct berval *id,
 217         struct berval *oldpass,
 218         struct berval *newpass,
 219         const char **text )
 220 {
 221         int rc = LDAP_SUCCESS;
 222         ber_tag_t tag;
 223         ber_len_t len = -1;
 224         BerElementBuffer berbuf;
 225         BerElement *ber = (BerElement *)&berbuf;
 226
 227         if( reqdata == NULL ) {
 228                 return LDAP_SUCCESS;
 229         }
 230
 231         if( reqdata->bv_len == 0 ) {
 232                 *text = "empty request data field";
 233                 return LDAP_PROTOCOL_ERROR;
 234         }
 235
 236         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 237         ber_init2( ber, reqdata, 0 );
 238
 239         tag = ber_scanf( ber, "{" /*}*/ );
 240
 241         if( tag == LBER_ERROR ) {
 242 #ifdef NEW_LOGGING
 243                 LDAP_LOG( OPERATION, ERR,
 244                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 245 #else
 246                 Debug( LDAP_DEBUG_TRACE,
 247                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 248 #endif
 249                 rc = LDAP_PROTOCOL_ERROR;
 250                 goto done;
 251         }
 252
 253         tag = ber_peek_tag( ber, &len );
 254         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 255                 if( id == NULL ) {
 256 #ifdef NEW_LOGGING
 257                         LDAP_LOG( OPERATION, ERR,
 258                            "slap_passwd_parse: ID not allowed.\n", 0, 0, 0 );
 259 #else
 260                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 261                                 0, 0, 0 );
 262 #endif
 263
 264                         *text = "user must change own password";
 265                         rc = LDAP_UNWILLING_TO_PERFORM;
 266                         goto done;
 267                 }
 268
 269                 tag = ber_scanf( ber, "m", id );
 270
 271                 if( tag == LBER_ERROR ) {
 272 #ifdef NEW_LOGGING
 273                         LDAP_LOG( OPERATION, ERR,
 274                            "slap_passwd_parse:  ID parse failed.\n", 0, 0, 0 );
 275 #else
 276                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 277                                 0, 0, 0 );
 278 #endif
 279
 280                         goto decoding_error;
 281                 }
 282
 283                 tag = ber_peek_tag( ber, &len);
 284         }
 285
 286         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 287                 if( oldpass == NULL ) {
 288 #ifdef NEW_LOGGING
 289                         LDAP_LOG( OPERATION, ERR,
 290                            "slap_passwd_parse: OLD not allowed.\n" , 0, 0, 0 );
 291 #else
 292                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 293                                 0, 0, 0 );
 294 #endif
 295
 296                         *text = "use bind to verify old password";
 297                         rc = LDAP_UNWILLING_TO_PERFORM;
 298                         goto done;
 299                 }
 300
 301                 tag = ber_scanf( ber, "m", oldpass );
 302
 303                 if( tag == LBER_ERROR ) {
 304 #ifdef NEW_LOGGING
 305                         LDAP_LOG( OPERATION, ERR,
 306                            "slap_passwd_parse:  ID parse failed.\n" , 0, 0, 0 );
 307 #else
 308                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 309                                 0, 0, 0 );
 310 #endif
 311
 312                         goto decoding_error;
 313                 }
 314
 315                 tag = ber_peek_tag( ber, &len );
 316         }
 317
 318         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 319                 if( newpass == NULL ) {
 320 #ifdef NEW_LOGGING
 321                         LDAP_LOG( OPERATION, ERR,
 322                            "slap_passwd_parse:  NEW not allowed.\n", 0, 0, 0 );
 323 #else
 324                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 325                                 0, 0, 0 );
 326 #endif
 327
 328                         *text = "user specified passwords disallowed";
 329                         rc = LDAP_UNWILLING_TO_PERFORM;
 330                         goto done;
 331                 }
 332
 333                 tag = ber_scanf( ber, "m", newpass );
 334
 335                 if( tag == LBER_ERROR ) {
 336 #ifdef NEW_LOGGING
 337                         LDAP_LOG( OPERATION, ERR,
 338                            "slap_passwd_parse:  OLD parse failed.\n", 0, 0, 0 );
 339 #else
 340                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 341                                 0, 0, 0 );
 342 #endif
 343
 344                         goto decoding_error;
 345                 }
 346
 347                 tag = ber_peek_tag( ber, &len );
 348         }
 349
 350         if( len != 0 ) {
 351 decoding_error:
 352 #ifdef NEW_LOGGING
 353                 LDAP_LOG( OPERATION, ERR,
 354                         "slap_passwd_parse: decoding error, len=%ld\n", (long)len, 0, 0 );
 355 #else
 356                 Debug( LDAP_DEBUG_TRACE,
 357                         "slap_passwd_parse: decoding error, len=%ld\n",
 358                         (long) len, 0, 0 );
 359 #endif
 360
 361                 *text = "data decoding error";
 362                 rc = LDAP_PROTOCOL_ERROR;
 363         }
 364
 365 done:
 366         return rc;
 367 }
 368
 369 struct berval * slap_passwd_return(
 370         struct berval           *cred )
 371 {
 372         int rc;
 373         struct berval *bv = NULL;
 374         BerElementBuffer berbuf;
 375         /* opaque structure, size unknown but smaller than berbuf */
 376         BerElement *ber = (BerElement *)&berbuf;
 377
 378         assert( cred != NULL );
 379
 380 #ifdef NEW_LOGGING
 381         LDAP_LOG( OPERATION, ENTRY,
 382                 "slap_passwd_return: %ld\n",(long)cred->bv_len, 0, 0 );
 383 #else
 384         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 385                 (long) cred->bv_len, 0, 0 );
 386 #endif
 387
 388         ber_init_w_nullc( ber, LBER_USE_DER );
 389
 390         rc = ber_printf( ber, "{tON}",
 391                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 392
 393         if( rc >= 0 ) {
 394                 (void) ber_flatten( ber, &bv );
 395         }
 396
 397         ber_free_buf( ber );
 398
 399         return bv;
 400 }
 401
 402 int
 403 slap_passwd_check(
 404         Connection *conn,
 405         Attribute *a,
 406         struct berval *cred,
 407         const char **text )
 408 {
 409         int result = 1;
 410         struct berval *bv;
 411
 412 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 413         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 414 #ifdef SLAPD_SPASSWD
 415         lutil_passwd_sasl_conn = conn->c_sasl_authctx;
 416 #endif
 417 #endif
 418
 419         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 420                 if( !lutil_passwd( bv, cred, NULL, text ) ) {
 421                         result = 0;
 422                         break;
 423                 }
 424         }
 425
 426 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 427 #ifdef SLAPD_SPASSWD
 428         lutil_passwd_sasl_conn = NULL;
 429 #endif
 430         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 431 #endif
 432
 433         return result;
 434 }
 435
 436 void
 437 slap_passwd_generate( struct berval *pass )
 438 {
 439 #ifdef NEW_LOGGING
 440         LDAP_LOG( OPERATION, ENTRY, "slap_passwd_generate: begin\n", 0, 0, 0 );
 441 #else
 442         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 443 #endif
 444         pass->bv_val = NULL;
 445         pass->bv_len = 0;
 446
 447         /*
 448          * generate passwords of only 8 characters as some getpass(3)
 449          * implementations truncate at 8 characters.
 450          */
 451         lutil_passwd_generate( pass, 8 );
 452 }
 453
 454 void
 455 slap_passwd_hash(
 456         char *hash,
 457         struct berval * cred,
 458         struct berval * new,
 459         const char **text )
 460 {
 461         new->bv_len = 0;
 462         new->bv_val = NULL;
 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 }