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         cb2.sc_next = &cb;
  51         int i, nhash;
  52         char **hashes;
  53
  54         assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
  55
  56         if( op->o_dn.bv_len == 0 ) {
  57                 rs->sr_text = "only authenticated users may change passwords";
  58                 return LDAP_STRONG_AUTH_REQUIRED;
  59         }
  60
  61         qpw->rs_old.bv_val = NULL;
  62         qpw->rs_new.bv_val = NULL;
  63         qpw->rs_mods = NULL;
  64         qpw->rs_modtail = NULL;
  65
  66         rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id, &qpw->rs_old,
  67                 &qpw->rs_new, &rs->sr_text );
  68
  69         if ( rs->sr_err != LDAP_SUCCESS ) {
  70                 return rs->sr_err;
  71         }
  72
  73         if ( id.bv_len ) {
  74                 op->o_req_dn = id;
  75                 /* ndn is in tmpmem, so we don't need to free it */
  76                 rs->sr_err = dnNormalize( 0, NULL, NULL, &id, &op->o_req_ndn, op->o_tmpmemctx );
  77                 if ( rs->sr_err != LDAP_SUCCESS ) {
  78                         rs->sr_text = "Invalid DN";
  79                         return rs->sr_err;
  80                 }
  81                 op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
  82         } else {
  83                 op->o_req_dn = op->o_dn;
  84                 op->o_req_ndn = op->o_ndn;
  85                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
  86                 op->o_bd = op->o_conn->c_authz_backend;
  87                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
  88         }
  89
  90         if( op->o_bd == NULL ) {
  91 #ifdef HAVE_CYRUS_SASL
  92                 return slap_sasl_setpass( op, rs );
  93 #else
  94                 rs->sr_text = "no authz backend";
  95                 return LDAP_OTHER;
  96 #endif
  97         }
  98
  99         if ( op->o_req_ndn.bv_len == 0 ) {
 100                 rs->sr_text = "no password is associated with the Root DSE";
 101                 return LDAP_UNWILLING_TO_PERFORM;
 102         }
 103
 104         if (backend_check_restrictions( op, rs,
 105                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 106                 return rs->sr_err;
 107         }
 108
 109
 110 #ifndef SLAPD_MULTIMASTER
 111         /* This does not apply to multi-master case */
 112         if( op->o_bd->be_update_ndn.bv_len ) {
 113                 /* we SHOULD return a referral in this case */
 114                 BerVarray defref = NULL;
 115                 if ( !LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 116                         syncinfo_t *si;
 117                         LDAP_STAILQ_FOREACH( si, &op->o_bd->be_syncinfo, si_next ) {
 118                                 struct berval tmpbv;
 119                                 ber_dupbv( &tmpbv, &si->si_provideruri_bv[0] );
 120                                 ber_bvarray_add( &defref, &tmpbv );
 121                         }
 122                 } else {
 123                         defref = referral_rewrite( op->o_bd->be_update_refs,
 124                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 125                 }
 126                 rs->sr_ref = defref;
 127                 return LDAP_REFERRAL;
 128         }
 129 #endif /* !SLAPD_MULTIMASTER */
 130
 131         /* generate a new password if none was provided */
 132         if ( qpw->rs_new.bv_len == 0 ) {
 133                 slap_passwd_generate( &qpw->rs_new );
 134                 if ( qpw->rs_new.bv_len ) {
 135                         rsp = slap_passwd_return( &qpw->rs_new );
 136                 }
 137         }
 138         if ( qpw->rs_new.bv_len == 0 ) {
 139                 rs->sr_text = "password generation failed";
 140                 return LDAP_OTHER;
 141         }
 142
 143         /* Give the backend a chance to handle this itself */
 144         if ( op->o_bd->be_extended ) {
 145                 rs->sr_err = op->o_bd->be_extended( op, rs );
 146                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 147                         rs->sr_err != SLAP_CB_CONTINUE ) {
 148                         return rs->sr_err;
 149                 }
 150         }
 151
 152         /* The backend didn't handle it, so try it here */
 153         if( op->o_bd && !op->o_bd->be_modify ) {
 154                 rs->sr_text = "operation not supported for current user";
 155                 return LDAP_UNWILLING_TO_PERFORM;
 156         }
 157
 158         ml = ch_malloc( sizeof(Modifications) );
 159         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 160
 161         if ( default_passwd_hash ) {
 162                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 163                 hashes = default_passwd_hash;
 164         } else {
 165                 nhash = 1;
 166                 hashes = (char **)defhash;
 167         }
 168         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 169         for ( i=0; hashes[i]; i++ ) {
 170                 slap_passwd_hash( hashes[i], &qpw->rs_new, &hash, &rs->sr_text );
 171                 if ( hash.bv_len == 0 ) {
 172                         if ( !rs->sr_text ) {
 173                                 rs->sr_text = "password hash failed";
 174                         }
 175                         break;
 176                 }
 177                 ml->sml_values[i] = hash;
 178         }
 179         ml->sml_values[i].bv_val = NULL;
 180         ml->sml_nvalues = NULL;
 181         ml->sml_desc = slap_schema.si_ad_userPassword;
 182         ml->sml_op = LDAP_MOD_REPLACE;
 183         ml->sml_next = qpw->rs_mods;
 184         qpw->rs_mods = ml;
 185         if ( rsp ) {
 186                 free( qpw->rs_new.bv_val );
 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
 197                 rs->sr_err = slap_mods_opattrs( &op2, ml, qpw->rs_modtail, &rs->sr_text,
 198                         NULL, 0 );
 199
 200                 if ( rs->sr_err == LDAP_SUCCESS ) {
 201                         rs->sr_err = op2.o_bd->be_modify( &op2, rs );
 202                 }
 203                 if ( rs->sr_err == LDAP_SUCCESS ) {
 204                         rs->sr_rspdata = rsp;
 205                 } else if ( rsp ) {
 206                         ber_bvfree( rsp );
 207                 }
 208         }
 209         slap_mods_free( qpw->rs_mods );
 210
 211         return rs->sr_err;
 212 }
 213
 214 int slap_passwd_parse( struct berval *reqdata,
 215         struct berval *id,
 216         struct berval *oldpass,
 217         struct berval *newpass,
 218         const char **text )
 219 {
 220         int rc = LDAP_SUCCESS;
 221         ber_tag_t tag;
 222         ber_len_t len = -1;
 223         BerElementBuffer berbuf;
 224         BerElement *ber = (BerElement *)&berbuf;
 225
 226         if( reqdata == NULL ) {
 227                 return LDAP_SUCCESS;
 228         }
 229
 230         if( reqdata->bv_len == 0 ) {
 231                 *text = "empty request data field";
 232                 return LDAP_PROTOCOL_ERROR;
 233         }
 234
 235         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 236         ber_init2( ber, reqdata, 0 );
 237
 238         tag = ber_scanf( ber, "{" /*}*/ );
 239
 240         if( tag == LBER_ERROR ) {
 241 #ifdef NEW_LOGGING
 242                 LDAP_LOG( OPERATION, ERR,
 243                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 244 #else
 245                 Debug( LDAP_DEBUG_TRACE,
 246                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 247 #endif
 248                 rc = LDAP_PROTOCOL_ERROR;
 249                 goto done;
 250         }
 251
 252         tag = ber_peek_tag( ber, &len );
 253         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 254                 if( id == NULL ) {
 255 #ifdef NEW_LOGGING
 256                         LDAP_LOG( OPERATION, ERR,
 257                            "slap_passwd_parse: ID not allowed.\n", 0, 0, 0 );
 258 #else
 259                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 260                                 0, 0, 0 );
 261 #endif
 262
 263                         *text = "user must change own password";
 264                         rc = LDAP_UNWILLING_TO_PERFORM;
 265                         goto done;
 266                 }
 267
 268                 tag = ber_scanf( ber, "m", id );
 269
 270                 if( tag == LBER_ERROR ) {
 271 #ifdef NEW_LOGGING
 272                         LDAP_LOG( OPERATION, ERR,
 273                            "slap_passwd_parse:  ID parse failed.\n", 0, 0, 0 );
 274 #else
 275                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 276                                 0, 0, 0 );
 277 #endif
 278
 279                         goto decoding_error;
 280                 }
 281
 282                 tag = ber_peek_tag( ber, &len);
 283         }
 284
 285         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 286                 if( oldpass == NULL ) {
 287 #ifdef NEW_LOGGING
 288                         LDAP_LOG( OPERATION, ERR,
 289                            "slap_passwd_parse: OLD not allowed.\n" , 0, 0, 0 );
 290 #else
 291                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 292                                 0, 0, 0 );
 293 #endif
 294
 295                         *text = "use bind to verify old password";
 296                         rc = LDAP_UNWILLING_TO_PERFORM;
 297                         goto done;
 298                 }
 299
 300                 tag = ber_scanf( ber, "m", oldpass );
 301
 302                 if( tag == LBER_ERROR ) {
 303 #ifdef NEW_LOGGING
 304                         LDAP_LOG( OPERATION, ERR,
 305                            "slap_passwd_parse:  ID parse failed.\n" , 0, 0, 0 );
 306 #else
 307                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 308                                 0, 0, 0 );
 309 #endif
 310
 311                         goto decoding_error;
 312                 }
 313
 314                 tag = ber_peek_tag( ber, &len );
 315         }
 316
 317         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 318                 if( newpass == NULL ) {
 319 #ifdef NEW_LOGGING
 320                         LDAP_LOG( OPERATION, ERR,
 321                            "slap_passwd_parse:  NEW not allowed.\n", 0, 0, 0 );
 322 #else
 323                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 324                                 0, 0, 0 );
 325 #endif
 326
 327                         *text = "user specified passwords disallowed";
 328                         rc = LDAP_UNWILLING_TO_PERFORM;
 329                         goto done;
 330                 }
 331
 332                 tag = ber_scanf( ber, "m", newpass );
 333
 334                 if( tag == LBER_ERROR ) {
 335 #ifdef NEW_LOGGING
 336                         LDAP_LOG( OPERATION, ERR,
 337                            "slap_passwd_parse:  OLD parse failed.\n", 0, 0, 0 );
 338 #else
 339                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 340                                 0, 0, 0 );
 341 #endif
 342
 343                         goto decoding_error;
 344                 }
 345
 346                 tag = ber_peek_tag( ber, &len );
 347         }
 348
 349         if( len != 0 ) {
 350 decoding_error:
 351 #ifdef NEW_LOGGING
 352                 LDAP_LOG( OPERATION, ERR,
 353                         "slap_passwd_parse: decoding error, len=%ld\n", (long)len, 0, 0 );
 354 #else
 355                 Debug( LDAP_DEBUG_TRACE,
 356                         "slap_passwd_parse: decoding error, len=%ld\n",
 357                         (long) len, 0, 0 );
 358 #endif
 359
 360                 *text = "data decoding error";
 361                 rc = LDAP_PROTOCOL_ERROR;
 362         }
 363
 364 done:
 365         return rc;
 366 }
 367
 368 struct berval * slap_passwd_return(
 369         struct berval           *cred )
 370 {
 371         int rc;
 372         struct berval *bv = NULL;
 373         BerElementBuffer berbuf;
 374         /* opaque structure, size unknown but smaller than berbuf */
 375         BerElement *ber = (BerElement *)&berbuf;
 376
 377         assert( cred != NULL );
 378
 379 #ifdef NEW_LOGGING
 380         LDAP_LOG( OPERATION, ENTRY,
 381                 "slap_passwd_return: %ld\n",(long)cred->bv_len, 0, 0 );
 382 #else
 383         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 384                 (long) cred->bv_len, 0, 0 );
 385 #endif
 386
 387         ber_init_w_nullc( ber, LBER_USE_DER );
 388
 389         rc = ber_printf( ber, "{tON}",
 390                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 391
 392         if( rc >= 0 ) {
 393                 (void) ber_flatten( ber, &bv );
 394         }
 395
 396         ber_free_buf( ber );
 397
 398         return bv;
 399 }
 400
 401 int
 402 slap_passwd_check(
 403         Connection *conn,
 404         Attribute *a,
 405         struct berval *cred,
 406         const char **text )
 407 {
 408         int result = 1;
 409         struct berval *bv;
 410
 411 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 412         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 413 #ifdef SLAPD_SPASSWD
 414         lutil_passwd_sasl_conn = conn->c_sasl_authctx;
 415 #endif
 416 #endif
 417
 418         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 419                 if( !lutil_passwd( bv, cred, NULL, text ) ) {
 420                         result = 0;
 421                         break;
 422                 }
 423         }
 424
 425 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 426 #ifdef SLAPD_SPASSWD
 427         lutil_passwd_sasl_conn = NULL;
 428 #endif
 429         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 430 #endif
 431
 432         return result;
 433 }
 434
 435 void
 436 slap_passwd_generate( struct berval *pass )
 437 {
 438 #ifdef NEW_LOGGING
 439         LDAP_LOG( OPERATION, ENTRY, "slap_passwd_generate: begin\n", 0, 0, 0 );
 440 #else
 441         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 442 #endif
 443         pass->bv_val = NULL;
 444         pass->bv_len = 0;
 445
 446         /*
 447          * generate passwords of only 8 characters as some getpass(3)
 448          * implementations truncate at 8 characters.
 449          */
 450         lutil_passwd_generate( pass, 8 );
 451 }
 452
 453 void
 454 slap_passwd_hash(
 455         char *hash,
 456         struct berval * cred,
 457         struct berval * new,
 458         const char **text )
 459 {
 460         new->bv_len = 0;
 461         new->bv_val = NULL;
 462
 463 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 464         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 465 #endif
 466
 467         lutil_passwd_hash( cred , hash, new, text );
 468
 469 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 470         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 471 #endif
 472
 473 }