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                 !LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 115                 /* we SHOULD return a referral in this case */
 116                 BerVarray defref = NULL;
 117                 if ( !LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 118                         syncinfo_t *si;
 119                         LDAP_STAILQ_FOREACH( si, &op->o_bd->be_syncinfo, si_next ) {
 120                                 struct berval tmpbv;
 121                                 ber_dupbv( &tmpbv, &si->si_provideruri_bv[0] );
 122                                 ber_bvarray_add( &defref, &tmpbv );
 123                         }
 124                 } else {
 125                         defref = referral_rewrite( op->o_bd->be_update_refs,
 126                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 127                 }
 128                 rs->sr_ref = defref;
 129                 return LDAP_REFERRAL;
 130         }
 131 #endif /* !SLAPD_MULTIMASTER */
 132
 133         /* generate a new password if none was provided */
 134         if ( qpw->rs_new.bv_len == 0 ) {
 135                 slap_passwd_generate( &qpw->rs_new );
 136                 if ( qpw->rs_new.bv_len ) {
 137                         rsp = slap_passwd_return( &qpw->rs_new );
 138                 }
 139         }
 140         if ( qpw->rs_new.bv_len == 0 ) {
 141                 rs->sr_text = "password generation failed";
 142                 return LDAP_OTHER;
 143         }
 144
 145         /* Give the backend a chance to handle this itself */
 146         if ( op->o_bd->be_extended ) {
 147                 rs->sr_err = op->o_bd->be_extended( op, rs );
 148                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 149                         rs->sr_err != SLAP_CB_CONTINUE ) {
 150                         return rs->sr_err;
 151                 }
 152         }
 153
 154         /* The backend didn't handle it, so try it here */
 155         if( op->o_bd && !op->o_bd->be_modify ) {
 156                 rs->sr_text = "operation not supported for current user";
 157                 return LDAP_UNWILLING_TO_PERFORM;
 158         }
 159
 160         ml = ch_malloc( sizeof(Modifications) );
 161         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 162
 163         if ( default_passwd_hash ) {
 164                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 165                 hashes = default_passwd_hash;
 166         } else {
 167                 nhash = 1;
 168                 hashes = (char **)defhash;
 169         }
 170         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 171         for ( i=0; hashes[i]; i++ ) {
 172                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 173                 if ( hash.bv_len == 0 ) {
 174                         if ( !rs->sr_text ) {
 175                                 rs->sr_text = "password hash failed";
 176                         }
 177                         break;
 178                 }
 179                 ml->sml_values[i] = hash;
 180         }
 181         ml->sml_values[i].bv_val = NULL;
 182         ml->sml_nvalues = NULL;
 183         ml->sml_desc = slap_schema.si_ad_userPassword;
 184         ml->sml_op = LDAP_MOD_REPLACE;
 185         ml->sml_next = qpw->rs_mods;
 186         qpw->rs_mods = ml;
 187
 188         if ( hashes[i] ) {
 189                 rs->sr_err = LDAP_OTHER;
 190         } else {
 191
 192                 op2 = *op;
 193                 op2.o_tag = LDAP_REQ_MODIFY;
 194                 op2.o_callback = &cb2;
 195                 op2.orm_modlist = qpw->rs_mods;
 196                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 197                                          * if it cares... */
 198
 199                 rs->sr_err = slap_mods_opattrs( &op2, ml, qpw->rs_modtail, &rs->sr_text,
 200                         NULL, 0 );
 201
 202                 if ( rs->sr_err == LDAP_SUCCESS ) {
 203                         rs->sr_err = op2.o_bd->be_modify( &op2, rs );
 204                 }
 205                 if ( rs->sr_err == LDAP_SUCCESS ) {
 206                         rs->sr_rspdata = rsp;
 207                 } else if ( rsp ) {
 208                         ber_bvfree( rsp );
 209                 }
 210         }
 211         slap_mods_free( qpw->rs_mods );
 212         if ( rsp ) {
 213                 free( qpw->rs_new.bv_val );
 214         }
 215
 216         return rs->sr_err;
 217 }
 218
 219 int slap_passwd_parse( struct berval *reqdata,
 220         struct berval *id,
 221         struct berval *oldpass,
 222         struct berval *newpass,
 223         const char **text )
 224 {
 225         int rc = LDAP_SUCCESS;
 226         ber_tag_t tag;
 227         ber_len_t len = -1;
 228         BerElementBuffer berbuf;
 229         BerElement *ber = (BerElement *)&berbuf;
 230
 231         if( reqdata == NULL ) {
 232                 return LDAP_SUCCESS;
 233         }
 234
 235         if( reqdata->bv_len == 0 ) {
 236                 *text = "empty request data field";
 237                 return LDAP_PROTOCOL_ERROR;
 238         }
 239
 240         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 241         ber_init2( ber, reqdata, 0 );
 242
 243         tag = ber_scanf( ber, "{" /*}*/ );
 244
 245         if( tag == LBER_ERROR ) {
 246 #ifdef NEW_LOGGING
 247                 LDAP_LOG( OPERATION, ERR,
 248                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 249 #else
 250                 Debug( LDAP_DEBUG_TRACE,
 251                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 252 #endif
 253                 rc = LDAP_PROTOCOL_ERROR;
 254                 goto done;
 255         }
 256
 257         tag = ber_peek_tag( ber, &len );
 258         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 259                 if( id == NULL ) {
 260 #ifdef NEW_LOGGING
 261                         LDAP_LOG( OPERATION, ERR,
 262                            "slap_passwd_parse: ID not allowed.\n", 0, 0, 0 );
 263 #else
 264                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 265                                 0, 0, 0 );
 266 #endif
 267
 268                         *text = "user must change own password";
 269                         rc = LDAP_UNWILLING_TO_PERFORM;
 270                         goto done;
 271                 }
 272
 273                 tag = ber_scanf( ber, "m", id );
 274
 275                 if( tag == LBER_ERROR ) {
 276 #ifdef NEW_LOGGING
 277                         LDAP_LOG( OPERATION, ERR,
 278                            "slap_passwd_parse:  ID parse failed.\n", 0, 0, 0 );
 279 #else
 280                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 281                                 0, 0, 0 );
 282 #endif
 283
 284                         goto decoding_error;
 285                 }
 286
 287                 tag = ber_peek_tag( ber, &len);
 288         }
 289
 290         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 291                 if( oldpass == NULL ) {
 292 #ifdef NEW_LOGGING
 293                         LDAP_LOG( OPERATION, ERR,
 294                            "slap_passwd_parse: OLD not allowed.\n" , 0, 0, 0 );
 295 #else
 296                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 297                                 0, 0, 0 );
 298 #endif
 299
 300                         *text = "use bind to verify old password";
 301                         rc = LDAP_UNWILLING_TO_PERFORM;
 302                         goto done;
 303                 }
 304
 305                 tag = ber_scanf( ber, "m", oldpass );
 306
 307                 if( tag == LBER_ERROR ) {
 308 #ifdef NEW_LOGGING
 309                         LDAP_LOG( OPERATION, ERR,
 310                            "slap_passwd_parse:  ID parse failed.\n" , 0, 0, 0 );
 311 #else
 312                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 313                                 0, 0, 0 );
 314 #endif
 315
 316                         goto decoding_error;
 317                 }
 318
 319                 tag = ber_peek_tag( ber, &len );
 320         }
 321
 322         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 323                 if( newpass == NULL ) {
 324 #ifdef NEW_LOGGING
 325                         LDAP_LOG( OPERATION, ERR,
 326                            "slap_passwd_parse:  NEW not allowed.\n", 0, 0, 0 );
 327 #else
 328                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 329                                 0, 0, 0 );
 330 #endif
 331
 332                         *text = "user specified passwords disallowed";
 333                         rc = LDAP_UNWILLING_TO_PERFORM;
 334                         goto done;
 335                 }
 336
 337                 tag = ber_scanf( ber, "m", newpass );
 338
 339                 if( tag == LBER_ERROR ) {
 340 #ifdef NEW_LOGGING
 341                         LDAP_LOG( OPERATION, ERR,
 342                            "slap_passwd_parse:  OLD parse failed.\n", 0, 0, 0 );
 343 #else
 344                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 345                                 0, 0, 0 );
 346 #endif
 347
 348                         goto decoding_error;
 349                 }
 350
 351                 tag = ber_peek_tag( ber, &len );
 352         }
 353
 354         if( len != 0 ) {
 355 decoding_error:
 356 #ifdef NEW_LOGGING
 357                 LDAP_LOG( OPERATION, ERR,
 358                         "slap_passwd_parse: decoding error, len=%ld\n", (long)len, 0, 0 );
 359 #else
 360                 Debug( LDAP_DEBUG_TRACE,
 361                         "slap_passwd_parse: decoding error, len=%ld\n",
 362                         (long) len, 0, 0 );
 363 #endif
 364
 365                 *text = "data decoding error";
 366                 rc = LDAP_PROTOCOL_ERROR;
 367         }
 368
 369 done:
 370         return rc;
 371 }
 372
 373 struct berval * slap_passwd_return(
 374         struct berval           *cred )
 375 {
 376         int rc;
 377         struct berval *bv = NULL;
 378         BerElementBuffer berbuf;
 379         /* opaque structure, size unknown but smaller than berbuf */
 380         BerElement *ber = (BerElement *)&berbuf;
 381
 382         assert( cred != NULL );
 383
 384 #ifdef NEW_LOGGING
 385         LDAP_LOG( OPERATION, ENTRY,
 386                 "slap_passwd_return: %ld\n",(long)cred->bv_len, 0, 0 );
 387 #else
 388         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 389                 (long) cred->bv_len, 0, 0 );
 390 #endif
 391
 392         ber_init_w_nullc( ber, LBER_USE_DER );
 393
 394         rc = ber_printf( ber, "{tON}",
 395                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 396
 397         if( rc >= 0 ) {
 398                 (void) ber_flatten( ber, &bv );
 399         }
 400
 401         ber_free_buf( ber );
 402
 403         return bv;
 404 }
 405
 406 int
 407 slap_passwd_check(
 408         Connection *conn,
 409         Attribute *a,
 410         struct berval *cred,
 411         const char **text )
 412 {
 413         int result = 1;
 414         struct berval *bv;
 415
 416 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 417         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 418 #ifdef SLAPD_SPASSWD
 419         lutil_passwd_sasl_conn = conn->c_sasl_authctx;
 420 #endif
 421 #endif
 422
 423         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 424                 if( !lutil_passwd( bv, cred, NULL, text ) ) {
 425                         result = 0;
 426                         break;
 427                 }
 428         }
 429
 430 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 431 #ifdef SLAPD_SPASSWD
 432         lutil_passwd_sasl_conn = NULL;
 433 #endif
 434         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 435 #endif
 436
 437         return result;
 438 }
 439
 440 void
 441 slap_passwd_generate( struct berval *pass )
 442 {
 443 #ifdef NEW_LOGGING
 444         LDAP_LOG( OPERATION, ENTRY, "slap_passwd_generate: begin\n", 0, 0, 0 );
 445 #else
 446         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 447 #endif
 448         pass->bv_val = NULL;
 449         pass->bv_len = 0;
 450
 451         /*
 452          * generate passwords of only 8 characters as some getpass(3)
 453          * implementations truncate at 8 characters.
 454          */
 455         lutil_passwd_generate( pass, 8 );
 456 }
 457
 458 void
 459 slap_passwd_hash_type(
 460         struct berval * cred,
 461         struct berval * new,
 462         char *hash,
 463         const char **text )
 464 {
 465         new->bv_len = 0;
 466         new->bv_val = NULL;
 467
 468         assert( hash );
 469
 470 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 471         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 472 #endif
 473
 474         lutil_passwd_hash( cred , hash, new, text );
 475
 476 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 477         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 478 #endif
 479
 480 }
 481 void
 482 slap_passwd_hash(
 483         struct berval * cred,
 484         struct berval * new,
 485         const char **text )
 486 {
 487         char *hash = NULL;
 488         if ( default_passwd_hash ) {
 489                 hash = default_passwd_hash[0];
 490         }
 491         if ( !hash ) {
 492                 hash = (char *)defhash[0];
 493         }
 494
 495         slap_passwd_hash_type( cred, new, hash, text );
 496 }