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(!( !SLAP_SHADOW( op->o_bd ) || be_isupdate( op ))) {
 114                 /* we SHOULD return a referral in this case */
 115                 BerVarray defref = op->o_bd->be_update_refs
 116                         ? op->o_bd->be_update_refs : default_referral;
 117
 118                 if( defref != NULL ) {
 119                         rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs,
 120                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 121                         if(rs->sr_ref) {
 122                                 rs->sr_flags |= REP_REF_MUSTBEFREED;
 123                         } else {
 124                                 rs->sr_ref = defref;
 125                         }
 126                         return LDAP_REFERRAL;
 127
 128                 }
 129
 130                 rs->sr_text = "shadow context; no update referral";
 131                 return LDAP_UNWILLING_TO_PERFORM;
 132         }
 133 #endif /* !SLAPD_MULTIMASTER */
 134
 135         /* generate a new password if none was provided */
 136         if ( qpw->rs_new.bv_len == 0 ) {
 137                 slap_passwd_generate( &qpw->rs_new );
 138                 if ( qpw->rs_new.bv_len ) {
 139                         rsp = slap_passwd_return( &qpw->rs_new );
 140                 }
 141         }
 142         if ( qpw->rs_new.bv_len == 0 ) {
 143                 rs->sr_text = "password generation failed";
 144                 return LDAP_OTHER;
 145         }
 146
 147         /* Give the backend a chance to handle this itself */
 148         if ( op->o_bd->be_extended ) {
 149                 rs->sr_err = op->o_bd->be_extended( op, rs );
 150                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
 151                         rs->sr_err != SLAP_CB_CONTINUE ) {
 152                         return rs->sr_err;
 153                 }
 154         }
 155
 156         /* The backend didn't handle it, so try it here */
 157         if( op->o_bd && !op->o_bd->be_modify ) {
 158                 rs->sr_text = "operation not supported for current user";
 159                 return LDAP_UNWILLING_TO_PERFORM;
 160         }
 161
 162         ml = ch_malloc( sizeof(Modifications) );
 163         if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
 164
 165         if ( default_passwd_hash ) {
 166                 for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
 167                 hashes = default_passwd_hash;
 168         } else {
 169                 nhash = 1;
 170                 hashes = (char **)defhash;
 171         }
 172         ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
 173         for ( i=0; hashes[i]; i++ ) {
 174                 slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text );
 175                 if ( hash.bv_len == 0 ) {
 176                         if ( !rs->sr_text ) {
 177                                 rs->sr_text = "password hash failed";
 178                         }
 179                         break;
 180                 }
 181                 ml->sml_values[i] = hash;
 182         }
 183         ml->sml_values[i].bv_val = NULL;
 184         ml->sml_nvalues = NULL;
 185         ml->sml_desc = slap_schema.si_ad_userPassword;
 186         ml->sml_op = LDAP_MOD_REPLACE;
 187         ml->sml_next = qpw->rs_mods;
 188         qpw->rs_mods = ml;
 189
 190         if ( hashes[i] ) {
 191                 rs->sr_err = LDAP_OTHER;
 192         } else {
 193
 194                 op2 = *op;
 195                 op2.o_tag = LDAP_REQ_MODIFY;
 196                 op2.o_callback = &cb2;
 197                 op2.orm_modlist = qpw->rs_mods;
 198                 cb2.sc_private = qpw;   /* let Modify know this was pwdMod,
 199                                          * if it cares... */
 200
 201                 rs->sr_err = slap_mods_opattrs( &op2, ml, qpw->rs_modtail, &rs->sr_text,
 202                         NULL, 0 );
 203
 204                 if ( rs->sr_err == LDAP_SUCCESS ) {
 205                         rs->sr_err = op2.o_bd->be_modify( &op2, rs );
 206                 }
 207                 if ( rs->sr_err == LDAP_SUCCESS ) {
 208                         rs->sr_rspdata = rsp;
 209                 } else if ( rsp ) {
 210                         ber_bvfree( rsp );
 211                 }
 212         }
 213         slap_mods_free( qpw->rs_mods );
 214         if ( rsp ) {
 215                 free( qpw->rs_new.bv_val );
 216         }
 217
 218         return rs->sr_err;
 219 }
 220
 221 int slap_passwd_parse( struct berval *reqdata,
 222         struct berval *id,
 223         struct berval *oldpass,
 224         struct berval *newpass,
 225         const char **text )
 226 {
 227         int rc = LDAP_SUCCESS;
 228         ber_tag_t tag;
 229         ber_len_t len = -1;
 230         BerElementBuffer berbuf;
 231         BerElement *ber = (BerElement *)&berbuf;
 232
 233         if( reqdata == NULL ) {
 234                 return LDAP_SUCCESS;
 235         }
 236
 237         if( reqdata->bv_len == 0 ) {
 238                 *text = "empty request data field";
 239                 return LDAP_PROTOCOL_ERROR;
 240         }
 241
 242         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 243         ber_init2( ber, reqdata, 0 );
 244
 245         tag = ber_scanf( ber, "{" /*}*/ );
 246
 247         if( tag == LBER_ERROR ) {
 248 #ifdef NEW_LOGGING
 249                 LDAP_LOG( OPERATION, ERR,
 250                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 251 #else
 252                 Debug( LDAP_DEBUG_TRACE,
 253                         "slap_passwd_parse: decoding error\n", 0, 0, 0 );
 254 #endif
 255                 rc = LDAP_PROTOCOL_ERROR;
 256                 goto done;
 257         }
 258
 259         tag = ber_peek_tag( ber, &len );
 260         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 261                 if( id == NULL ) {
 262 #ifdef NEW_LOGGING
 263                         LDAP_LOG( OPERATION, ERR,
 264                            "slap_passwd_parse: ID not allowed.\n", 0, 0, 0 );
 265 #else
 266                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 267                                 0, 0, 0 );
 268 #endif
 269
 270                         *text = "user must change own password";
 271                         rc = LDAP_UNWILLING_TO_PERFORM;
 272                         goto done;
 273                 }
 274
 275                 tag = ber_scanf( ber, "m", id );
 276
 277                 if( tag == LBER_ERROR ) {
 278 #ifdef NEW_LOGGING
 279                         LDAP_LOG( OPERATION, ERR,
 280                            "slap_passwd_parse:  ID parse failed.\n", 0, 0, 0 );
 281 #else
 282                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 283                                 0, 0, 0 );
 284 #endif
 285
 286                         goto decoding_error;
 287                 }
 288
 289                 tag = ber_peek_tag( ber, &len);
 290         }
 291
 292         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 293                 if( oldpass == NULL ) {
 294 #ifdef NEW_LOGGING
 295                         LDAP_LOG( OPERATION, ERR,
 296                            "slap_passwd_parse: OLD not allowed.\n" , 0, 0, 0 );
 297 #else
 298                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 299                                 0, 0, 0 );
 300 #endif
 301
 302                         *text = "use bind to verify old password";
 303                         rc = LDAP_UNWILLING_TO_PERFORM;
 304                         goto done;
 305                 }
 306
 307                 tag = ber_scanf( ber, "m", oldpass );
 308
 309                 if( tag == LBER_ERROR ) {
 310 #ifdef NEW_LOGGING
 311                         LDAP_LOG( OPERATION, ERR,
 312                            "slap_passwd_parse:  ID parse failed.\n" , 0, 0, 0 );
 313 #else
 314                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 315                                 0, 0, 0 );
 316 #endif
 317
 318                         goto decoding_error;
 319                 }
 320
 321                 tag = ber_peek_tag( ber, &len );
 322         }
 323
 324         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 325                 if( newpass == NULL ) {
 326 #ifdef NEW_LOGGING
 327                         LDAP_LOG( OPERATION, ERR,
 328                            "slap_passwd_parse:  NEW not allowed.\n", 0, 0, 0 );
 329 #else
 330                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 331                                 0, 0, 0 );
 332 #endif
 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 #ifdef NEW_LOGGING
 343                         LDAP_LOG( OPERATION, ERR,
 344                            "slap_passwd_parse:  OLD parse failed.\n", 0, 0, 0 );
 345 #else
 346                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 347                                 0, 0, 0 );
 348 #endif
 349
 350                         goto decoding_error;
 351                 }
 352
 353                 tag = ber_peek_tag( ber, &len );
 354         }
 355
 356         if( len != 0 ) {
 357 decoding_error:
 358 #ifdef NEW_LOGGING
 359                 LDAP_LOG( OPERATION, ERR,
 360                         "slap_passwd_parse: decoding error, len=%ld\n", (long)len, 0, 0 );
 361 #else
 362                 Debug( LDAP_DEBUG_TRACE,
 363                         "slap_passwd_parse: decoding error, len=%ld\n",
 364                         (long) len, 0, 0 );
 365 #endif
 366
 367                 *text = "data decoding error";
 368                 rc = LDAP_PROTOCOL_ERROR;
 369         }
 370
 371 done:
 372         return rc;
 373 }
 374
 375 struct berval * slap_passwd_return(
 376         struct berval           *cred )
 377 {
 378         int rc;
 379         struct berval *bv = NULL;
 380         BerElementBuffer berbuf;
 381         /* opaque structure, size unknown but smaller than berbuf */
 382         BerElement *ber = (BerElement *)&berbuf;
 383
 384         assert( cred != NULL );
 385
 386 #ifdef NEW_LOGGING
 387         LDAP_LOG( OPERATION, ENTRY,
 388                 "slap_passwd_return: %ld\n",(long)cred->bv_len, 0, 0 );
 389 #else
 390         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 391                 (long) cred->bv_len, 0, 0 );
 392 #endif
 393
 394         ber_init_w_nullc( ber, LBER_USE_DER );
 395
 396         rc = ber_printf( ber, "{tON}",
 397                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 398
 399         if( rc >= 0 ) {
 400                 (void) ber_flatten( ber, &bv );
 401         }
 402
 403         ber_free_buf( ber );
 404
 405         return bv;
 406 }
 407
 408 int
 409 slap_passwd_check(
 410         Connection *conn,
 411         Attribute *a,
 412         struct berval *cred,
 413         const char **text )
 414 {
 415         int result = 1;
 416         struct berval *bv;
 417
 418 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 419         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 420 #ifdef SLAPD_SPASSWD
 421         lutil_passwd_sasl_conn = conn->c_sasl_authctx;
 422 #endif
 423 #endif
 424
 425         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 426                 if( !lutil_passwd( bv, cred, NULL, text ) ) {
 427                         result = 0;
 428                         break;
 429                 }
 430         }
 431
 432 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 433 #ifdef SLAPD_SPASSWD
 434         lutil_passwd_sasl_conn = NULL;
 435 #endif
 436         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 437 #endif
 438
 439         return result;
 440 }
 441
 442 void
 443 slap_passwd_generate( struct berval *pass )
 444 {
 445 #ifdef NEW_LOGGING
 446         LDAP_LOG( OPERATION, ENTRY, "slap_passwd_generate: begin\n", 0, 0, 0 );
 447 #else
 448         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 449 #endif
 450         pass->bv_val = NULL;
 451         pass->bv_len = 0;
 452
 453         /*
 454          * generate passwords of only 8 characters as some getpass(3)
 455          * implementations truncate at 8 characters.
 456          */
 457         lutil_passwd_generate( pass, 8 );
 458 }
 459
 460 void
 461 slap_passwd_hash_type(
 462         struct berval * cred,
 463         struct berval * new,
 464         char *hash,
 465         const char **text )
 466 {
 467         new->bv_len = 0;
 468         new->bv_val = NULL;
 469
 470         assert( hash );
 471
 472 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 473         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 474 #endif
 475
 476         lutil_passwd_hash( cred , hash, new, text );
 477
 478 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 479         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 480 #endif
 481
 482 }
 483 void
 484 slap_passwd_hash(
 485         struct berval * cred,
 486         struct berval * new,
 487         const char **text )
 488 {
 489         char *hash = NULL;
 490         if ( default_passwd_hash ) {
 491                 hash = default_passwd_hash[0];
 492         }
 493         if ( !hash ) {
 494                 hash = (char *)defhash[0];
 495         }
 496
 497         slap_passwd_hash_type( cred, new, hash, text );
 498 }