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         Modifications *ml;
  48         Operation op2;
  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
  55         cb2.sc_next = &cb;
  56
  57         assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
  58
  59         if( op->o_dn.bv_len == 0 ) {
  60                 rs->sr_text = "only authenticated users may change passwords";
  61                 return LDAP_STRONG_AUTH_REQUIRED;
  62         }
  63
  64         qpw->rs_old.bv_val = NULL;
  65         qpw->rs_new.bv_val = NULL;
  66         qpw->rs_mods = NULL;
  67         qpw->rs_modtail = NULL;
  68
  69         rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id, &qpw->rs_old,
  70                 &qpw->rs_new, &rs->sr_text );
  71
  72         if ( rs->sr_err != LDAP_SUCCESS ) {
  73                 return rs->sr_err;
  74         }
  75
  76         if ( id.bv_len ) {
  77                 ber_dupbv_x( &op->o_req_dn, &id, op->o_tmpmemctx );
  78                 /* ndn is in tmpmem, so we don't need to free it */
  79                 rs->sr_err = dnNormalize( 0, NULL, NULL, &id, &op->o_req_ndn, op->o_tmpmemctx );
  80                 if ( rs->sr_err != LDAP_SUCCESS ) {
  81                         rs->sr_text = "Invalid DN";
  82                         rc = rs->sr_err;
  83                         goto error_return;
  84                 }
  85                 op->o_bd = select_backend( &op->o_req_ndn, 0, 1 );
  86
  87         } else {
  88                 ber_dupbv_x( &op->o_req_dn, &op->o_dn, op->o_tmpmemctx );
  89                 ber_dupbv_x( &op->o_req_ndn, &op->o_ndn, op->o_tmpmemctx );
  90                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
  91                 op->o_bd = op->o_conn->c_authz_backend;
  92                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
  93         }
  94
  95         if( op->o_bd == NULL ) {
  96 #ifdef HAVE_CYRUS_SASL
  97                 rc = slap_sasl_setpass( op, rs );
  98 #else
  99                 rs->sr_text = "no authz backend";
 100                 rc = LDAP_OTHER;
 101 #endif
 102                 goto error_return;
 103         }
 104
 105         if ( op->o_req_ndn.bv_len == 0 ) {
 106                 rs->sr_text = "no password is associated with the Root DSE";
 107                 rc = LDAP_UNWILLING_TO_PERFORM;
 108                 goto error_return;
 109         }
 110
 111         if (backend_check_restrictions( op, rs,
 112                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 113                 rc = rs->sr_err;
 114                 goto error_return;
 115         }
 116
 117         /* check for referrals */
 118         if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) {
 119                 rc = rs->sr_err;
 120                 goto error_return;
 121         }
 122
 123 #ifndef SLAPD_MULTIMASTER
 124         /* This does not apply to multi-master case */
 125         if(!( !SLAP_SHADOW( op->o_bd ) || be_isupdate( op ))) {
 126                 /* we SHOULD return a referral in this case */
 127                 BerVarray defref = op->o_bd->be_update_refs
 128                         ? op->o_bd->be_update_refs : default_referral;
 129
 130                 if( defref != NULL ) {
 131                         rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
 132                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 133                         if(rs->sr_ref) {
 134                                 rs->sr_flags |= REP_REF_MUSTBEFREED;
 135                         } else {
 136                                 rs->sr_ref = defref;
 137                         }
 138                         rc = LDAP_REFERRAL;
 139                         goto error_return;
 140
 141                 }
 142
 143                 rs->sr_text = "shadow context; no update referral";
 144                 rc = LDAP_UNWILLING_TO_PERFORM;
 145                 goto error_return;
 146         }
 147 #endif /* !SLAPD_MULTIMASTER */
 148
 149         /* generate a new password if none was provided */
 150         if ( qpw->rs_new.bv_len == 0 ) {
 151                 slap_passwd_generate( &qpw->rs_new );
 152                 if ( qpw->rs_new.bv_len ) {
 153                         rsp = slap_passwd_return( &qpw->rs_new );
 154                 }
 155         }
 156         if ( qpw->rs_new.bv_len == 0 ) {
 157                 rs->sr_text = "password generation failed";
 158                 rc = LDAP_OTHER;
 159                 goto error_return;
 160         }
 161
 162         /* Give the backend a chance to handle this itself */
 163         if ( op->o_bd->be_extended ) {
 164                 rs->sr_err = op->o_bd->be_extended( op, rs );
 165                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 166                         rs->sr_err != SLAP_CB_CONTINUE ) {
 167                         rc = rs->sr_err;
 168                         goto error_return;
 169                 }
 170         }
 171
 172         /* The backend didn't handle it, so try it here */
 173         if( op->o_bd && !op->o_bd->be_modify ) {
 174                 rs->sr_text = "operation not supported for current user";
 175                 rc = LDAP_UNWILLING_TO_PERFORM;
 176                 goto error_return;
 177         }
 178
 179         ml = ch_malloc( sizeof(Modifications) );
 180         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 181
 182         if ( default_passwd_hash ) {
 183                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 184                 hashes = default_passwd_hash;
 185         } else {
 186                 nhash = 1;
 187                 hashes = (char **)defhash;
 188         }
 189         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 190         for ( i=0; hashes[i]; i++ ) {
 191                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 192                 if ( hash.bv_len == 0 ) {
 193                         if ( !rs->sr_text ) {
 194                                 rs->sr_text = "password hash failed";
 195                         }
 196                         break;
 197                 }
 198                 ml->sml_values[i] = hash;
 199         }
 200         ml->sml_values[i].bv_val = NULL;
 201         ml->sml_nvalues = NULL;
 202         ml->sml_desc = slap_schema.si_ad_userPassword;
 203         ml->sml_op = LDAP_MOD_REPLACE;
 204         ml->sml_next = qpw->rs_mods;
 205         qpw->rs_mods = ml;
 206
 207         if ( hashes[i] ) {
 208                 rs->sr_err = LDAP_OTHER;
 209
 210         } else {
 211                 op2 = *op;
 212                 op2.o_tag = LDAP_REQ_MODIFY;
 213                 op2.o_callback = &cb2;
 214                 op2.orm_modlist = qpw->rs_mods;
 215                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 216                                          * if it cares... */
 217
 218                 rs->sr_err = slap_mods_opattrs( &op2, ml, qpw->rs_modtail, &rs->sr_text,
 219                         NULL, 0, 1 );
 220
 221                 if ( rs->sr_err == LDAP_SUCCESS ) {
 222                         rs->sr_err = op2.o_bd->be_modify( &op2, rs );
 223                         /* FIXME: in case it got rewritten... */
 224                         op->o_req_dn = op2.o_req_dn;
 225                         op->o_req_ndn = op2.o_req_ndn;
 226                 }
 227                 if ( rs->sr_err == LDAP_SUCCESS ) {
 228                         rs->sr_rspdata = rsp;
 229                 } else if ( rsp ) {
 230                         ber_bvfree( rsp );
 231                 }
 232         }
 233         slap_mods_free( qpw->rs_mods );
 234         if ( rsp ) {
 235                 free( qpw->rs_new.bv_val );
 236         }
 237
 238         rc = rs->sr_err;
 239
 240 error_return:;
 241         if ( !BER_BVISNULL( &op->o_req_dn ) ) {
 242                 op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 243         }
 244         if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
 245                 op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 246         }
 247
 248         return rc;
 249 }
 250
 251 int slap_passwd_parse( struct berval *reqdata,
 252         struct berval *id,
 253         struct berval *oldpass,
 254         struct berval *newpass,
 255         const char **text )
 256 {
 257         int rc = LDAP_SUCCESS;
 258         ber_tag_t tag;
 259         ber_len_t len = -1;
 260         BerElementBuffer berbuf;
 261         BerElement *ber = (BerElement *)&berbuf;
 262
 263         if( reqdata == NULL ) {
 264                 return LDAP_SUCCESS;
 265         }
 266
 267         if( reqdata->bv_len == 0 ) {
 268                 *text = "empty request data field";
 269                 return LDAP_PROTOCOL_ERROR;
 270         }
 271
 272         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 273         ber_init2( ber, reqdata, 0 );
 274
 275         tag = ber_scanf( ber, "{" /*}*/ );
 276
 277         if( tag == LBER_ERROR ) {
 278                 Debug( LDAP_DEBUG_TRACE,
 279                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 280                 rc = LDAP_PROTOCOL_ERROR;
 281                 goto done;
 282         }
 283
 284         tag = ber_peek_tag( ber, &len );
 285         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 286                 if( id == NULL ) {
 287                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 288                                 0, 0, 0 );
 289
 290                         *text = "user must change own password";
 291                         rc = LDAP_UNWILLING_TO_PERFORM;
 292                         goto done;
 293                 }
 294
 295                 tag = ber_scanf( ber, "m", id );
 296
 297                 if( tag == LBER_ERROR ) {
 298                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 299                                 0, 0, 0 );
 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                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 310                                 0, 0, 0 );
 311
 312                         *text = "use bind to verify old password";
 313                         rc = LDAP_UNWILLING_TO_PERFORM;
 314                         goto done;
 315                 }
 316
 317                 tag = ber_scanf( ber, "m", oldpass );
 318
 319                 if( tag == LBER_ERROR ) {
 320                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 321                                 0, 0, 0 );
 322
 323                         goto decoding_error;
 324                 }
 325
 326                 tag = ber_peek_tag( ber, &len );
 327         }
 328
 329         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 330                 if( newpass == NULL ) {
 331                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 332                                 0, 0, 0 );
 333
 334                         *text = "user specified passwords disallowed";
 335                         rc = LDAP_UNWILLING_TO_PERFORM;
 336                         goto done;
 337                 }
 338
 339                 tag = ber_scanf( ber, "m", newpass );
 340
 341                 if( tag == LBER_ERROR ) {
 342                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n",
 343                                 0, 0, 0 );
 344
 345                         goto decoding_error;
 346                 }
 347
 348                 tag = ber_peek_tag( ber, &len );
 349         }
 350
 351         if( len != 0 ) {
 352 decoding_error:
 353                 Debug( LDAP_DEBUG_TRACE,
 354                         "slap_passwd_parse: decoding error, len=%ld\n",
 355                         (long) len, 0, 0 );
 356
 357                 *text = "data decoding error";
 358                 rc = LDAP_PROTOCOL_ERROR;
 359         }
 360
 361 done:
 362         return rc;
 363 }
 364
 365 struct berval * slap_passwd_return(
 366         struct berval           *cred )
 367 {
 368         int rc;
 369         struct berval *bv = NULL;
 370         BerElementBuffer berbuf;
 371         /* opaque structure, size unknown but smaller than berbuf */
 372         BerElement *ber = (BerElement *)&berbuf;
 373
 374         assert( cred != NULL );
 375
 376         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 377                 (long) cred->bv_len, 0, 0 );
 378
 379         ber_init_w_nullc( ber, LBER_USE_DER );
 380
 381         rc = ber_printf( ber, "{tON}",
 382                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 383
 384         if( rc >= 0 ) {
 385                 (void) ber_flatten( ber, &bv );
 386         }
 387
 388         ber_free_buf( ber );
 389
 390         return bv;
 391 }
 392
 393 /*
 394  * if "e" is provided, access to each value of the password is checked first
 395  */
 396 int
 397 slap_passwd_check(
 398         Operation       *op,
 399         Entry           *e,
 400         Attribute       *a,
 401         struct berval   *cred,
 402         const char      **text )
 403 {
 404         int                     result = 1;
 405         struct berval           *bv;
 406         AccessControlState      acl_state = ACL_STATE_INIT;
 407
 408 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 409         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 410 #ifdef SLAPD_SPASSWD
 411         lutil_passwd_sasl_conn = op->o_conn->c_sasl_authctx;
 412 #endif
 413 #endif
 414
 415         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 416                 /* if e is provided, check access */
 417                 if ( e && access_allowed( op, e, a->a_desc, bv,
 418                                         ACL_AUTH, &acl_state ) == 0 )
 419                 {
 420                         continue;
 421                 }
 422
 423                 if ( !lutil_passwd( bv, cred, NULL, text ) ) {
 424                         result = 0;
 425                         break;
 426                 }
 427         }
 428
 429 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 430 #ifdef SLAPD_SPASSWD
 431         lutil_passwd_sasl_conn = NULL;
 432 #endif
 433         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 434 #endif
 435
 436         return result;
 437 }
 438
 439 void
 440 slap_passwd_generate( struct berval *pass )
 441 {
 442         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 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_type(
 455         struct berval * cred,
 456         struct berval * new,
 457         char *hash,
 458         const char **text )
 459 {
 460         new->bv_len = 0;
 461         new->bv_val = NULL;
 462
 463         assert( hash );
 464
 465 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 466         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 467 #endif
 468
 469         lutil_passwd_hash( cred , hash, new, text );
 470
 471 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 472         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 473 #endif
 474
 475 }
 476 void
 477 slap_passwd_hash(
 478         struct berval * cred,
 479         struct berval * new,
 480         const char **text )
 481 {
 482         char *hash = NULL;
 483         if ( default_passwd_hash ) {
 484                 hash = default_passwd_hash[0];
 485         }
 486         if ( !hash ) {
 487                 hash = (char *)defhash[0];
 488         }
 489
 490         slap_passwd_hash_type( cred, new, hash, text );
 491 }