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         int     rc;
  53
  54         cb2.sc_next = &cb;
  55
  56         assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
  57
  58         if( op->o_dn.bv_len == 0 ) {
  59                 rs->sr_text = "only authenticated users may change passwords";
  60                 return LDAP_STRONG_AUTH_REQUIRED;
  61         }
  62
  63         qpw->rs_old.bv_val = NULL;
  64         qpw->rs_new.bv_val = NULL;
  65         qpw->rs_mods = NULL;
  66         qpw->rs_modtail = NULL;
  67
  68         rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id, &qpw->rs_old,
  69                 &qpw->rs_new, &rs->sr_text );
  70
  71         if ( rs->sr_err != LDAP_SUCCESS ) {
  72                 return rs->sr_err;
  73         }
  74
  75         if ( id.bv_len ) {
  76                 ber_dupbv_x( &op->o_req_dn, &id, op->o_tmpmemctx );
  77                 /* ndn is in tmpmem, so we don't need to free it */
  78                 rs->sr_err = dnNormalize( 0, NULL, NULL, &id, &op->o_req_ndn, op->o_tmpmemctx );
  79                 if ( rs->sr_err != LDAP_SUCCESS ) {
  80                         rs->sr_text = "Invalid DN";
  81                         rc = rs->sr_err;
  82                         goto error_return;
  83                 }
  84                 op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
  85
  86         } else {
  87                 ber_dupbv_x( &op->o_req_dn, &op->o_dn, op->o_tmpmemctx );
  88                 ber_dupbv_x( &op->o_req_ndn, &op->o_ndn, op->o_tmpmemctx );
  89                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
  90                 op->o_bd = op->o_conn->c_authz_backend;
  91                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
  92         }
  93
  94         if( op->o_bd == NULL ) {
  95 #ifdef HAVE_CYRUS_SASL
  96                 rc = slap_sasl_setpass( op, rs );
  97 #else
  98                 rs->sr_text = "no authz backend";
  99                 rc = LDAP_OTHER;
 100 #endif
 101                 goto error_return;
 102         }
 103
 104         if ( op->o_req_ndn.bv_len == 0 ) {
 105                 rs->sr_text = "no password is associated with the Root DSE";
 106                 rc = LDAP_UNWILLING_TO_PERFORM;
 107                 goto error_return;
 108         }
 109
 110         if (backend_check_restrictions( op, rs,
 111                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
 112                 rc = rs->sr_err;
 113                 goto error_return;
 114         }
 115
 116
 117 #ifndef SLAPD_MULTIMASTER
 118         /* This does not apply to multi-master case */
 119         if(!( !SLAP_SHADOW( op->o_bd ) || be_isupdate( op ))) {
 120                 /* we SHOULD return a referral in this case */
 121                 BerVarray defref = op->o_bd->be_update_refs
 122                         ? op->o_bd->be_update_refs : default_referral;
 123
 124                 if( defref != NULL ) {
 125                         rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
 126                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 127                         if(rs->sr_ref) {
 128                                 rs->sr_flags |= REP_REF_MUSTBEFREED;
 129                         } else {
 130                                 rs->sr_ref = defref;
 131                         }
 132                         rc = LDAP_REFERRAL;
 133                         goto error_return;
 134
 135                 }
 136
 137                 rs->sr_text = "shadow context; no update referral";
 138                 rc = LDAP_UNWILLING_TO_PERFORM;
 139                 goto error_return;
 140         }
 141 #endif /* !SLAPD_MULTIMASTER */
 142
 143         /* generate a new password if none was provided */
 144         if ( qpw->rs_new.bv_len == 0 ) {
 145                 slap_passwd_generate( &qpw->rs_new );
 146                 if ( qpw->rs_new.bv_len ) {
 147                         rsp = slap_passwd_return( &qpw->rs_new );
 148                 }
 149         }
 150         if ( qpw->rs_new.bv_len == 0 ) {
 151                 rs->sr_text = "password generation failed";
 152                 rc = LDAP_OTHER;
 153                 goto error_return;
 154         }
 155
 156         /* Give the backend a chance to handle this itself */
 157         if ( op->o_bd->be_extended ) {
 158                 rs->sr_err = op->o_bd->be_extended( op, rs );
 159                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 160                         rs->sr_err != SLAP_CB_CONTINUE ) {
 161                         rc = rs->sr_err;
 162                         goto error_return;
 163                 }
 164         }
 165
 166         /* The backend didn't handle it, so try it here */
 167         if( op->o_bd && !op->o_bd->be_modify ) {
 168                 rs->sr_text = "operation not supported for current user";
 169                 rc = LDAP_UNWILLING_TO_PERFORM;
 170                 goto error_return;
 171         }
 172
 173         ml = ch_malloc( sizeof(Modifications) );
 174         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 175
 176         if ( default_passwd_hash ) {
 177                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 178                 hashes = default_passwd_hash;
 179         } else {
 180                 nhash = 1;
 181                 hashes = (char **)defhash;
 182         }
 183         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 184         for ( i=0; hashes[i]; i++ ) {
 185                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 186                 if ( hash.bv_len == 0 ) {
 187                         if ( !rs->sr_text ) {
 188                                 rs->sr_text = "password hash failed";
 189                         }
 190                         break;
 191                 }
 192                 ml->sml_values[i] = hash;
 193         }
 194         ml->sml_values[i].bv_val = NULL;
 195         ml->sml_nvalues = NULL;
 196         ml->sml_desc = slap_schema.si_ad_userPassword;
 197         ml->sml_op = LDAP_MOD_REPLACE;
 198         ml->sml_next = qpw->rs_mods;
 199         qpw->rs_mods = ml;
 200
 201         if ( hashes[i] ) {
 202                 rs->sr_err = LDAP_OTHER;
 203
 204         } else {
 205                 op2 = *op;
 206                 op2.o_tag = LDAP_REQ_MODIFY;
 207                 op2.o_callback = &cb2;
 208                 op2.orm_modlist = qpw->rs_mods;
 209                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 210                                          * if it cares... */
 211
 212                 rs->sr_err = slap_mods_opattrs( &op2, ml, qpw->rs_modtail, &rs->sr_text,
 213                         NULL, 0, 1 );
 214
 215                 if ( rs->sr_err == LDAP_SUCCESS ) {
 216                         rs->sr_err = op2.o_bd->be_modify( &op2, rs );
 217                         /* FIXME: in case it got rewritten... */
 218                         op->o_req_dn = op2.o_req_dn;
 219                         op->o_req_ndn = op2.o_req_ndn;
 220                 }
 221                 if ( rs->sr_err == LDAP_SUCCESS ) {
 222                         rs->sr_rspdata = rsp;
 223                 } else if ( rsp ) {
 224                         ber_bvfree( rsp );
 225                 }
 226         }
 227         slap_mods_free( qpw->rs_mods );
 228         if ( rsp ) {
 229                 free( qpw->rs_new.bv_val );
 230         }
 231
 232         rc = rs->sr_err;
 233
 234 error_return:;
 235         if ( !BER_BVISNULL( &op->o_req_dn ) ) {
 236                 op->o_tmpfree( op->o_req_dn.bv_val, op->o_tmpmemctx );
 237         }
 238         if ( !BER_BVISNULL( &op->o_req_ndn ) ) {
 239                 op->o_tmpfree( op->o_req_ndn.bv_val, op->o_tmpmemctx );
 240         }
 241
 242         return rc;
 243 }
 244
 245 int slap_passwd_parse( struct berval *reqdata,
 246         struct berval *id,
 247         struct berval *oldpass,
 248         struct berval *newpass,
 249         const char **text )
 250 {
 251         int rc = LDAP_SUCCESS;
 252         ber_tag_t tag;
 253         ber_len_t len = -1;
 254         BerElementBuffer berbuf;
 255         BerElement *ber = (BerElement *)&berbuf;
 256
 257         if( reqdata == NULL ) {
 258                 return LDAP_SUCCESS;
 259         }
 260
 261         if( reqdata->bv_len == 0 ) {
 262                 *text = "empty request data field";
 263                 return LDAP_PROTOCOL_ERROR;
 264         }
 265
 266         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 267         ber_init2( ber, reqdata, 0 );
 268
 269         tag = ber_scanf( ber, "{" /*}*/ );
 270
 271         if( tag == LBER_ERROR ) {
 272                 Debug( LDAP_DEBUG_TRACE,
 273                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 274                 rc = LDAP_PROTOCOL_ERROR;
 275                 goto done;
 276         }
 277
 278         tag = ber_peek_tag( ber, &len );
 279         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 280                 if( id == NULL ) {
 281                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 282                                 0, 0, 0 );
 283
 284                         *text = "user must change own password";
 285                         rc = LDAP_UNWILLING_TO_PERFORM;
 286                         goto done;
 287                 }
 288
 289                 tag = ber_scanf( ber, "m", id );
 290
 291                 if( tag == LBER_ERROR ) {
 292                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 293                                 0, 0, 0 );
 294
 295                         goto decoding_error;
 296                 }
 297
 298                 tag = ber_peek_tag( ber, &len);
 299         }
 300
 301         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 302                 if( oldpass == NULL ) {
 303                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 304                                 0, 0, 0 );
 305
 306                         *text = "use bind to verify old password";
 307                         rc = LDAP_UNWILLING_TO_PERFORM;
 308                         goto done;
 309                 }
 310
 311                 tag = ber_scanf( ber, "m", oldpass );
 312
 313                 if( tag == LBER_ERROR ) {
 314                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 315                                 0, 0, 0 );
 316
 317                         goto decoding_error;
 318                 }
 319
 320                 tag = ber_peek_tag( ber, &len );
 321         }
 322
 323         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 324                 if( newpass == NULL ) {
 325                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 326                                 0, 0, 0 );
 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                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 337                                 0, 0, 0 );
 338
 339                         goto decoding_error;
 340                 }
 341
 342                 tag = ber_peek_tag( ber, &len );
 343         }
 344
 345         if( len != 0 ) {
 346 decoding_error:
 347                 Debug( LDAP_DEBUG_TRACE,
 348                         "slap_passwd_parse: decoding error, len=%ld\n",
 349                         (long) len, 0, 0 );
 350
 351                 *text = "data decoding error";
 352                 rc = LDAP_PROTOCOL_ERROR;
 353         }
 354
 355 done:
 356         return rc;
 357 }
 358
 359 struct berval * slap_passwd_return(
 360         struct berval           *cred )
 361 {
 362         int rc;
 363         struct berval *bv = NULL;
 364         BerElementBuffer berbuf;
 365         /* opaque structure, size unknown but smaller than berbuf */
 366         BerElement *ber = (BerElement *)&berbuf;
 367
 368         assert( cred != NULL );
 369
 370         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 371                 (long) cred->bv_len, 0, 0 );
 372
 373         ber_init_w_nullc( ber, LBER_USE_DER );
 374
 375         rc = ber_printf( ber, "{tON}",
 376                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 377
 378         if( rc >= 0 ) {
 379                 (void) ber_flatten( ber, &bv );
 380         }
 381
 382         ber_free_buf( ber );
 383
 384         return bv;
 385 }
 386
 387 int
 388 slap_passwd_check(
 389         Connection *conn,
 390         Attribute *a,
 391         struct berval *cred,
 392         const char **text )
 393 {
 394         int result = 1;
 395         struct berval *bv;
 396
 397 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 398         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 399 #ifdef SLAPD_SPASSWD
 400         lutil_passwd_sasl_conn = conn->c_sasl_authctx;
 401 #endif
 402 #endif
 403
 404         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 405                 if( !lutil_passwd( bv, cred, NULL, text ) ) {
 406                         result = 0;
 407                         break;
 408                 }
 409         }
 410
 411 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 412 #ifdef SLAPD_SPASSWD
 413         lutil_passwd_sasl_conn = NULL;
 414 #endif
 415         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 416 #endif
 417
 418         return result;
 419 }
 420
 421 void
 422 slap_passwd_generate( struct berval *pass )
 423 {
 424         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 425         pass->bv_val = NULL;
 426         pass->bv_len = 0;
 427
 428         /*
 429          * generate passwords of only 8 characters as some getpass(3)
 430          * implementations truncate at 8 characters.
 431          */
 432         lutil_passwd_generate( pass, 8 );
 433 }
 434
 435 void
 436 slap_passwd_hash_type(
 437         struct berval * cred,
 438         struct berval * new,
 439         char *hash,
 440         const char **text )
 441 {
 442         new->bv_len = 0;
 443         new->bv_val = NULL;
 444
 445         assert( hash );
 446
 447 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 448         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 449 #endif
 450
 451         lutil_passwd_hash( cred , hash, new, text );
 452
 453 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 454         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 455 #endif
 456
 457 }
 458 void
 459 slap_passwd_hash(
 460         struct berval * cred,
 461         struct berval * new,
 462         const char **text )
 463 {
 464         char *hash = NULL;
 465         if ( default_passwd_hash ) {
 466                 hash = default_passwd_hash[0];
 467         }
 468         if ( !hash ) {
 469                 hash = (char *)defhash[0];
 470         }
 471
 472         slap_passwd_hash_type( cred, new, hash, text );
 473 }