git.sur5r.net Git - openldap/blob - servers/slapd/sasl.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2018 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15
  16 #include "portable.h"
  17
  18 #include <stdio.h>
  19 #ifdef HAVE_LIMITS_H
  20 #include <limits.h>
  21 #endif
  22
  23 #include <ac/stdlib.h>
  24 #include <ac/string.h>
  25
  26 #include <lber.h>
  27 #include <ldap_log.h>
  28
  29 #include "slap.h"
  30
  31 #ifdef ENABLE_REWRITE
  32 #include <rewrite.h>
  33 #endif
  34
  35 #ifdef HAVE_CYRUS_SASL
  36 # ifdef HAVE_SASL_SASL_H
  37 #  include <sasl/sasl.h>
  38 #  include <sasl/saslplug.h>
  39 # else
  40 #  include <sasl.h>
  41 #  include <saslplug.h>
  42 # endif
  43
  44 # define        SASL_CONST const
  45
  46 #define SASL_VERSION_FULL       ((SASL_VERSION_MAJOR << 16) |\
  47         (SASL_VERSION_MINOR << 8) | SASL_VERSION_STEP)
  48
  49 #if SASL_VERSION_MINOR >= 0x020119 /* 2.1.25 */
  50 typedef sasl_callback_ft slap_sasl_cb_ft;
  51 #else
  52 typedef int (*slap_sasl_cb_ft)();
  53 #endif
  54
  55 static sasl_security_properties_t sasl_secprops;
  56 #elif defined( SLAP_BUILTIN_SASL )
  57 /*
  58  * built-in SASL implementation
  59  *      only supports EXTERNAL
  60  */
  61 typedef struct sasl_ctx {
  62         slap_ssf_t sc_external_ssf;
  63         struct berval sc_external_id;
  64 } SASL_CTX;
  65
  66 #endif
  67
  68 #include <lutil.h>
  69
  70 static struct berval ext_bv = BER_BVC( "EXTERNAL" );
  71
  72 char *slap_sasl_auxprops;
  73
  74 #ifdef HAVE_CYRUS_SASL
  75
  76 /* Just use our internal auxprop by default */
  77 static int
  78 slap_sasl_getopt(
  79         void *context,
  80         const char *plugin_name,
  81         const char *option,
  82         const char **result,
  83         unsigned *len)
  84 {
  85         if ( strcmp( option, "auxprop_plugin" )) {
  86                 return SASL_FAIL;
  87         }
  88         if ( slap_sasl_auxprops )
  89                 *result = slap_sasl_auxprops;
  90         else
  91                 *result = "slapd";
  92         return SASL_OK;
  93 }
  94
  95 int
  96 slap_sasl_log(
  97         void *context,
  98         int priority,
  99         const char *message)
 100 {
 101         Connection *conn = context;
 102         int level;
 103         const char * label;
 104
 105         if ( message == NULL ) {
 106                 return SASL_BADPARAM;
 107         }
 108
 109         switch (priority) {
 110         case SASL_LOG_NONE:
 111                 level = LDAP_DEBUG_NONE;
 112                 label = "None";
 113                 break;
 114         case SASL_LOG_ERR:
 115                 level = LDAP_DEBUG_ANY;
 116                 label = "Error";
 117                 break;
 118         case SASL_LOG_FAIL:
 119                 level = LDAP_DEBUG_ANY;
 120                 label = "Failure";
 121                 break;
 122         case SASL_LOG_WARN:
 123                 level = LDAP_DEBUG_TRACE;
 124                 label = "Warning";
 125                 break;
 126         case SASL_LOG_NOTE:
 127                 level = LDAP_DEBUG_TRACE;
 128                 label = "Notice";
 129                 break;
 130         case SASL_LOG_DEBUG:
 131                 level = LDAP_DEBUG_TRACE;
 132                 label = "Debug";
 133                 break;
 134         case SASL_LOG_TRACE:
 135                 level = LDAP_DEBUG_TRACE;
 136                 label = "Trace";
 137                 break;
 138         case SASL_LOG_PASS:
 139                 level = LDAP_DEBUG_TRACE;
 140                 label = "Password Trace";
 141                 break;
 142         default:
 143                 return SASL_BADPARAM;
 144         }
 145
 146         Debug( level, "SASL [conn=%ld] %s: %s\n",
 147                 conn ? (long) conn->c_connid: -1L,
 148                 label, message );
 149
 150
 151         return SASL_OK;
 152 }
 153
 154 static const char *slap_propnames[] = {
 155         "*slapConn", "*slapAuthcDNlen", "*slapAuthcDN",
 156         "*slapAuthzDNlen", "*slapAuthzDN", NULL };
 157
 158 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 159 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 160
 161 #define SLAP_SASL_PROP_CONN     0
 162 #define SLAP_SASL_PROP_AUTHCLEN 1
 163 #define SLAP_SASL_PROP_AUTHC    2
 164 #define SLAP_SASL_PROP_AUTHZLEN 3
 165 #define SLAP_SASL_PROP_AUTHZ    4
 166 #define SLAP_SASL_PROP_COUNT    5       /* Number of properties we used */
 167
 168 typedef struct lookup_info {
 169         int flags;
 170         const struct propval *list;
 171         sasl_server_params_t *sparams;
 172 } lookup_info;
 173
 174 static slap_response sasl_ap_lookup;
 175
 176 static struct berval sc_cleartext = BER_BVC("{CLEARTEXT}");
 177
 178 static int
 179 sasl_ap_lookup( Operation *op, SlapReply *rs )
 180 {
 181         BerVarray bv;
 182         AttributeDescription *ad;
 183         Attribute *a;
 184         const char *text;
 185         int rc, i;
 186         lookup_info *sl = (lookup_info *)op->o_callback->sc_private;
 187
 188         if (rs->sr_type != REP_SEARCH) return 0;
 189
 190         for( i = 0; sl->list[i].name; i++ ) {
 191                 const char *name = sl->list[i].name;
 192
 193                 if ( name[0] == '*' ) {
 194                         if ( sl->flags & SASL_AUXPROP_AUTHZID ) continue;
 195                         /* Skip our private properties */
 196                         if ( !strcmp( name, slap_propnames[0] )) {
 197                                 i += SLAP_SASL_PROP_COUNT - 1;
 198                                 continue;
 199                         }
 200                         name++;
 201                 } else if ( !(sl->flags & SASL_AUXPROP_AUTHZID ) )
 202                         continue;
 203
 204                 if ( sl->list[i].values ) {
 205                         if ( !(sl->flags & SASL_AUXPROP_OVERRIDE) ) continue;
 206                 }
 207                 ad = NULL;
 208                 rc = slap_str2ad( name, &ad, &text );
 209                 if ( rc != LDAP_SUCCESS ) {
 210                         Debug( LDAP_DEBUG_TRACE,
 211                                 "slap_ap_lookup: str2ad(%s): %s\n", name, text, 0 );
 212                         continue;
 213                 }
 214
 215                 /* If it's the rootdn and a rootpw was present, we already set
 216                  * it so don't override it here.
 217                  */
 218                 if ( ad == slap_schema.si_ad_userPassword && sl->list[i].values &&
 219                         be_isroot_dn( op->o_bd, &op->o_req_ndn ))
 220                         continue;
 221
 222                 a = attr_find( rs->sr_entry->e_attrs, ad );
 223                 if ( !a ) continue;
 224                 if ( ! access_allowed( op, rs->sr_entry, ad, NULL, ACL_AUTH, NULL ) ) {
 225                         continue;
 226                 }
 227                 if ( sl->list[i].values && ( sl->flags & SASL_AUXPROP_OVERRIDE ) ) {
 228                         sl->sparams->utils->prop_erase( sl->sparams->propctx,
 229                         sl->list[i].name );
 230                 }
 231                 for ( bv = a->a_vals; bv->bv_val; bv++ ) {
 232                         /* ITS#3846 don't give hashed passwords to SASL */
 233                         if ( ad == slap_schema.si_ad_userPassword &&
 234                                 bv->bv_val[0] == '{' /*}*/ )
 235                         {
 236                                 if ( lutil_passwd_scheme( bv->bv_val ) ) {
 237                                         /* If it's not a recognized scheme, just assume it's
 238                                          * a cleartext password that happened to include brackets.
 239                                          *
 240                                          * If it's a recognized scheme, skip this value, unless the
 241                                          * scheme is {CLEARTEXT}. In that case, skip over the
 242                                          * scheme name and use the remainder. If there is nothing
 243                                          * past the scheme name, skip this value.
 244                                          */
 245 #ifdef SLAPD_CLEARTEXT
 246                                         if ( !strncasecmp( bv->bv_val, sc_cleartext.bv_val,
 247                                                 sc_cleartext.bv_len )) {
 248                                                 struct berval cbv;
 249                                                 cbv.bv_len = bv->bv_len - sc_cleartext.bv_len;
 250                                                 if ( cbv.bv_len > 0 ) {
 251                                                         cbv.bv_val = bv->bv_val + sc_cleartext.bv_len;
 252                                                         sl->sparams->utils->prop_set( sl->sparams->propctx,
 253                                                                 sl->list[i].name, cbv.bv_val, cbv.bv_len );
 254                                                 }
 255                                         }
 256 #endif
 257                                         continue;
 258                                 }
 259                         }
 260                         sl->sparams->utils->prop_set( sl->sparams->propctx,
 261                                 sl->list[i].name, bv->bv_val, bv->bv_len );
 262                 }
 263         }
 264         return LDAP_SUCCESS;
 265 }
 266
 267 #if SASL_VERSION_FULL >= 0x020118
 268 static int
 269 #else
 270 static void
 271 #endif
 272 slap_auxprop_lookup(
 273         void *glob_context,
 274         sasl_server_params_t *sparams,
 275         unsigned flags,
 276         const char *user,
 277         unsigned ulen)
 278 {
 279         OperationBuffer opbuf = {{ NULL }};
 280         Operation *op = (Operation *)&opbuf;
 281         int i, doit = 0;
 282         Connection *conn = NULL;
 283         lookup_info sl;
 284         int rc = LDAP_SUCCESS;
 285
 286         sl.list = sparams->utils->prop_get( sparams->propctx );
 287         sl.sparams = sparams;
 288         sl.flags = flags;
 289
 290         /* Find our DN and conn first */
 291         for( i = 0; sl.list[i].name; i++ ) {
 292                 if ( sl.list[i].name[0] == '*' ) {
 293                         if ( !strcmp( sl.list[i].name, slap_propnames[SLAP_SASL_PROP_CONN] ) ) {
 294                                 if ( sl.list[i].values && sl.list[i].values[0] )
 295                                         AC_MEMCPY( &conn, sl.list[i].values[0], sizeof( conn ) );
 296                                 continue;
 297                         }
 298                         if ( flags & SASL_AUXPROP_AUTHZID ) {
 299                                 if ( !strcmp( sl.list[i].name, slap_propnames[SLAP_SASL_PROP_AUTHZLEN] )) {
 300                                         if ( sl.list[i].values && sl.list[i].values[0] )
 301                                                 AC_MEMCPY( &op->o_req_ndn.bv_len, sl.list[i].values[0],
 302                                                         sizeof( op->o_req_ndn.bv_len ) );
 303                                 } else if ( !strcmp( sl.list[i].name, slap_propnames[SLAP_SASL_PROP_AUTHZ] )) {
 304                                         if ( sl.list[i].values )
 305                                                 op->o_req_ndn.bv_val = (char *)sl.list[i].values[0];
 306                                         break;
 307                                 }
 308                         }
 309
 310                         if ( !strcmp( sl.list[i].name, slap_propnames[SLAP_SASL_PROP_AUTHCLEN] )) {
 311                                 if ( sl.list[i].values && sl.list[i].values[0] )
 312                                         AC_MEMCPY( &op->o_req_ndn.bv_len, sl.list[i].values[0],
 313                                                 sizeof( op->o_req_ndn.bv_len ) );
 314                         } else if ( !strcmp( sl.list[i].name, slap_propnames[SLAP_SASL_PROP_AUTHC] ) ) {
 315                                 if ( sl.list[i].values ) {
 316                                         op->o_req_ndn.bv_val = (char *)sl.list[i].values[0];
 317                                         if ( !(flags & SASL_AUXPROP_AUTHZID) )
 318                                                 break;
 319                                 }
 320                         }
 321                 }
 322         }
 323
 324         /* we don't know anything about this, ignore it */
 325         if ( !conn ) {
 326                 rc == LDAP_SUCCESS;
 327                 goto done;
 328         }
 329
 330         /* Now see what else needs to be fetched */
 331         for( i = 0; sl.list[i].name; i++ ) {
 332                 const char *name = sl.list[i].name;
 333
 334                 if ( name[0] == '*' ) {
 335                         if ( flags & SASL_AUXPROP_AUTHZID ) continue;
 336                         /* Skip our private properties */
 337                         if ( !strcmp( name, slap_propnames[0] )) {
 338                                 i += SLAP_SASL_PROP_COUNT - 1;
 339                                 continue;
 340                         }
 341                         name++;
 342                 } else if ( !(flags & SASL_AUXPROP_AUTHZID ) )
 343                         continue;
 344
 345                 if ( sl.list[i].values ) {
 346                         if ( !(flags & SASL_AUXPROP_OVERRIDE) ) continue;
 347                 }
 348                 doit = 1;
 349                 break;
 350         }
 351
 352         if (doit) {
 353                 slap_callback cb = { NULL, sasl_ap_lookup, NULL, NULL };
 354
 355                 cb.sc_private = &sl;
 356
 357                 op->o_bd = select_backend( &op->o_req_ndn, 1 );
 358
 359                 if ( op->o_bd ) {
 360                         /* For rootdn, see if we can use the rootpw */
 361                         if ( be_isroot_dn( op->o_bd, &op->o_req_ndn ) &&
 362                                 !BER_BVISEMPTY( &op->o_bd->be_rootpw )) {
 363                                 struct berval cbv = BER_BVNULL;
 364
 365                                 /* If there's a recognized scheme, see if it's CLEARTEXT */
 366                                 if ( lutil_passwd_scheme( op->o_bd->be_rootpw.bv_val )) {
 367                                         if ( !strncasecmp( op->o_bd->be_rootpw.bv_val,
 368                                                 sc_cleartext.bv_val, sc_cleartext.bv_len )) {
 369
 370                                                 /* If it's CLEARTEXT, skip past scheme spec */
 371                                                 cbv.bv_len = op->o_bd->be_rootpw.bv_len -
 372                                                         sc_cleartext.bv_len;
 373                                                 if ( cbv.bv_len ) {
 374                                                         cbv.bv_val = op->o_bd->be_rootpw.bv_val +
 375                                                                 sc_cleartext.bv_len;
 376                                                 }
 377                                         }
 378                                 /* No scheme, use the whole value */
 379                                 } else {
 380                                         cbv = op->o_bd->be_rootpw;
 381                                 }
 382                                 if ( !BER_BVISEMPTY( &cbv )) {
 383                                         for( i = 0; sl.list[i].name; i++ ) {
 384                                                 const char *name = sl.list[i].name;
 385
 386                                                 if ( name[0] == '*' ) {
 387                                                         if ( flags & SASL_AUXPROP_AUTHZID ) continue;
 388                                                                 name++;
 389                                                 } else if ( !(flags & SASL_AUXPROP_AUTHZID ) )
 390                                                         continue;
 391
 392                                                 if ( !strcasecmp(name,"userPassword") ) {
 393                                                         sl.sparams->utils->prop_set( sl.sparams->propctx,
 394                                                                 sl.list[i].name, cbv.bv_val, cbv.bv_len );
 395                                                         break;
 396                                                 }
 397                                         }
 398                                 }
 399                         }
 400
 401                         if ( op->o_bd->be_search ) {
 402                                 SlapReply rs = {REP_RESULT};
 403                                 op->o_hdr = conn->c_sasl_bindop->o_hdr;
 404                                 op->o_controls = opbuf.ob_controls;
 405                                 op->o_tag = LDAP_REQ_SEARCH;
 406                                 op->o_dn = conn->c_ndn;
 407                                 op->o_ndn = conn->c_ndn;
 408                                 op->o_callback = &cb;
 409                                 slap_op_time( &op->o_time, &op->o_tincr );
 410                                 op->o_do_not_cache = 1;
 411                                 op->o_is_auth_check = 1;
 412                                 op->o_req_dn = op->o_req_ndn;
 413                                 op->ors_scope = LDAP_SCOPE_BASE;
 414                                 op->ors_deref = LDAP_DEREF_NEVER;
 415                                 op->ors_tlimit = SLAP_NO_LIMIT;
 416                                 op->ors_slimit = 1;
 417                                 op->ors_filter = &generic_filter;
 418                                 op->ors_filterstr = generic_filterstr;
 419                                 op->o_authz = conn->c_authz;
 420                                 /* FIXME: we want all attributes, right? */
 421                                 op->ors_attrs = NULL;
 422
 423                                 rc = op->o_bd->be_search( op, &rs );
 424                         }
 425                 }
 426         }
 427 done:;
 428 #if SASL_VERSION_FULL >= 0x020118
 429         return rc != LDAP_SUCCESS ? SASL_FAIL : SASL_OK;
 430 #endif
 431 }
 432
 433 #if SASL_VERSION_FULL >= 0x020110
 434 static int
 435 slap_auxprop_store(
 436         void *glob_context,
 437         sasl_server_params_t *sparams,
 438         struct propctx *prctx,
 439         const char *user,
 440         unsigned ulen)
 441 {
 442         Operation op = {0};
 443         Opheader oph;
 444         SlapReply rs = {REP_RESULT};
 445         int rc, i;
 446         unsigned j;
 447         Connection *conn = NULL;
 448         const struct propval *pr;
 449         Modifications *modlist = NULL, **modtail = &modlist, *mod;
 450         slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
 451         char textbuf[SLAP_TEXT_BUFLEN];
 452         const char *text;
 453         size_t textlen = sizeof(textbuf);
 454
 455         /* just checking if we are enabled */
 456         if (!prctx) return SASL_OK;
 457
 458         if (!sparams || !user) return SASL_BADPARAM;
 459
 460         pr = sparams->utils->prop_get( sparams->propctx );
 461
 462         /* Find our DN and conn first */
 463         for( i = 0; pr[i].name; i++ ) {
 464                 if ( pr[i].name[0] == '*' ) {
 465                         if ( !strcmp( pr[i].name, slap_propnames[SLAP_SASL_PROP_CONN] ) ) {
 466                                 if ( pr[i].values && pr[i].values[0] )
 467                                         AC_MEMCPY( &conn, pr[i].values[0], sizeof( conn ) );
 468                                 continue;
 469                         }
 470                         if ( !strcmp( pr[i].name, slap_propnames[SLAP_SASL_PROP_AUTHCLEN] )) {
 471                                 if ( pr[i].values && pr[i].values[0] )
 472                                         AC_MEMCPY( &op.o_req_ndn.bv_len, pr[i].values[0],
 473                                                 sizeof( op.o_req_ndn.bv_len ) );
 474                         } else if ( !strcmp( pr[i].name, slap_propnames[SLAP_SASL_PROP_AUTHC] ) ) {
 475                                 if ( pr[i].values )
 476                                         op.o_req_ndn.bv_val = (char *)pr[i].values[0];
 477                         }
 478                 }
 479         }
 480         if (!conn || !op.o_req_ndn.bv_val) return SASL_BADPARAM;
 481
 482         op.o_bd = select_backend( &op.o_req_ndn, 1 );
 483
 484         if ( !op.o_bd || !op.o_bd->be_modify ) return SASL_FAIL;
 485
 486         pr = sparams->utils->prop_get( prctx );
 487         if (!pr) return SASL_BADPARAM;
 488
 489         for (i=0; pr[i].name; i++);
 490         if (!i) return SASL_BADPARAM;
 491
 492         for (i=0; pr[i].name; i++) {
 493                 mod = (Modifications *)ch_malloc( sizeof(Modifications) );
 494                 mod->sml_op = LDAP_MOD_REPLACE;
 495                 mod->sml_flags = 0;
 496                 ber_str2bv( pr[i].name, 0, 0, &mod->sml_type );
 497                 mod->sml_numvals = pr[i].nvalues;
 498                 mod->sml_values = (struct berval *)ch_malloc( (pr[i].nvalues + 1) *
 499                         sizeof(struct berval));
 500                 for (j=0; j<pr[i].nvalues; j++) {
 501                         ber_str2bv( pr[i].values[j], 0, 1, &mod->sml_values[j]);
 502                 }
 503                 BER_BVZERO( &mod->sml_values[j] );
 504                 mod->sml_nvalues = NULL;
 505                 mod->sml_desc = NULL;
 506                 *modtail = mod;
 507                 modtail = &mod->sml_next;
 508         }
 509         *modtail = NULL;
 510
 511         rc = slap_mods_check( &op, modlist, &text, textbuf, textlen, NULL );
 512
 513         if ( rc == LDAP_SUCCESS ) {
 514                 rc = slap_mods_no_user_mod_check( &op, modlist,
 515                         &text, textbuf, textlen );
 516
 517                 if ( rc == LDAP_SUCCESS ) {
 518                         if ( conn->c_sasl_bindop ) {
 519                                 op.o_hdr = conn->c_sasl_bindop->o_hdr;
 520                         } else {
 521                                 op.o_hdr = &oph;
 522                                 memset( &oph, 0, sizeof(oph) );
 523                                 operation_fake_init( conn, &op, ldap_pvt_thread_pool_context(), 0 );
 524                         }
 525                         op.o_tag = LDAP_REQ_MODIFY;
 526                         op.o_ndn = op.o_req_ndn;
 527                         op.o_callback = &cb;
 528                         slap_op_time( &op.o_time, &op.o_tincr );
 529                         op.o_do_not_cache = 1;
 530                         op.o_is_auth_check = 1;
 531                         op.o_req_dn = op.o_req_ndn;
 532                         op.orm_modlist = modlist;
 533
 534                         rc = op.o_bd->be_modify( &op, &rs );
 535                 }
 536         }
 537         slap_mods_free( modlist, 1 );
 538         return rc != LDAP_SUCCESS ? SASL_FAIL : SASL_OK;
 539 }
 540 #endif /* SASL_VERSION_FULL >= 2.1.16 */
 541
 542 static sasl_auxprop_plug_t slap_auxprop_plugin = {
 543         0,      /* Features */
 544         0,      /* spare */
 545         NULL,   /* glob_context */
 546         NULL,   /* auxprop_free */
 547         slap_auxprop_lookup,
 548         "slapd",        /* name */
 549 #if SASL_VERSION_FULL >= 0x020110
 550         slap_auxprop_store      /* the declaration of this member changed
 551                                  * in cyrus SASL from 2.1.15 to 2.1.16 */
 552 #else
 553         NULL
 554 #endif
 555 };
 556
 557 static int
 558 slap_auxprop_init(
 559         const sasl_utils_t *utils,
 560         int max_version,
 561         int *out_version,
 562         sasl_auxprop_plug_t **plug,
 563         const char *plugname)
 564 {
 565         if ( !out_version || !plug ) return SASL_BADPARAM;
 566
 567         if ( max_version < SASL_AUXPROP_PLUG_VERSION ) return SASL_BADVERS;
 568
 569         *out_version = SASL_AUXPROP_PLUG_VERSION;
 570         *plug = &slap_auxprop_plugin;
 571         return SASL_OK;
 572 }
 573
 574 /* Convert a SASL authcid or authzid into a DN. Store the DN in an
 575  * auxiliary property, so that we can refer to it in sasl_authorize
 576  * without interfering with anything else. Also, the SASL username
 577  * buffer is constrained to 256 characters, and our DNs could be
 578  * much longer (SLAP_LDAPDN_MAXLEN, currently set to 8192)
 579  */
 580 static int
 581 slap_sasl_canonicalize(
 582         sasl_conn_t *sconn,
 583         void *context,
 584         const char *in,
 585         unsigned inlen,
 586         unsigned flags,
 587         const char *user_realm,
 588         char *out,
 589         unsigned out_max,
 590         unsigned *out_len)
 591 {
 592         Connection *conn = (Connection *)context;
 593         struct propctx *props = sasl_auxprop_getctx( sconn );
 594         struct propval auxvals[ SLAP_SASL_PROP_COUNT ] = { { 0 } };
 595         struct berval dn;
 596         int rc, which;
 597         const char *names[2];
 598         struct berval   bvin;
 599
 600         *out_len = 0;
 601
 602         Debug( LDAP_DEBUG_ARGS, "SASL Canonicalize [conn=%ld]: %s=\"%s\"\n",
 603                 conn ? (long) conn->c_connid : -1L,
 604                 (flags & SASL_CU_AUTHID) ? "authcid" : "authzid",
 605                 in ? in : "<empty>");
 606
 607         /* If name is too big, just truncate. We don't care, we're
 608          * using DNs, not the usernames.
 609          */
 610         if ( inlen > out_max )
 611                 inlen = out_max-1;
 612
 613         /* This is a Simple Bind using SPASSWD. That means the in-directory
 614          * userPassword of the Binding user already points at SASL, so it
 615          * cannot be used to actually satisfy a password comparison. Just
 616          * ignore it, some other mech will process it.
 617          */
 618         if ( !conn->c_sasl_bindop ||
 619                 conn->c_sasl_bindop->orb_method != LDAP_AUTH_SASL ) goto done;
 620
 621         /* See if we need to add request, can only do it once */
 622         prop_getnames( props, slap_propnames, auxvals );
 623         if ( !auxvals[0].name )
 624                 prop_request( props, slap_propnames );
 625
 626         if ( flags & SASL_CU_AUTHID )
 627                 which = SLAP_SASL_PROP_AUTHCLEN;
 628         else
 629                 which = SLAP_SASL_PROP_AUTHZLEN;
 630
 631         /* Need to store the Connection for auxprop_lookup */
 632         if ( !auxvals[SLAP_SASL_PROP_CONN].values ) {
 633                 names[0] = slap_propnames[SLAP_SASL_PROP_CONN];
 634                 names[1] = NULL;
 635                 prop_set( props, names[0], (char *)&conn, sizeof( conn ) );
 636         }
 637
 638         /* Already been here? */
 639         if ( auxvals[which].values )
 640                 goto done;
 641
 642         /* Normally we require an authzID to have a u: or dn: prefix.
 643          * However, SASL frequently gives us an authzID that is just
 644          * an exact copy of the authcID, without a prefix. We need to
 645          * detect and allow this condition. If SASL calls canonicalize
 646          * with SASL_CU_AUTHID|SASL_CU_AUTHZID this is a no-brainer.
 647          * But if it's broken into two calls, we need to remember the
 648          * authcID so that we can compare the authzID later. We store
 649          * the authcID temporarily in conn->c_sasl_dn. We necessarily
 650          * finish Canonicalizing before Authorizing, so there is no
 651          * conflict with slap_sasl_authorize's use of this temp var.
 652          *
 653          * The SASL EXTERNAL mech is backwards from all the other mechs,
 654          * it does authzID before the authcID. If we see that authzID
 655          * has already been done, don't do anything special with authcID.
 656          */
 657         if ( flags == SASL_CU_AUTHID && !auxvals[SLAP_SASL_PROP_AUTHZ].values ) {
 658                 conn->c_sasl_dn.bv_val = (char *) in;
 659                 conn->c_sasl_dn.bv_len = 0;
 660         } else if ( flags == SASL_CU_AUTHZID && conn->c_sasl_dn.bv_val ) {
 661                 rc = strcmp( in, conn->c_sasl_dn.bv_val );
 662                 conn->c_sasl_dn.bv_val = NULL;
 663                 /* They were equal, no work needed */
 664                 if ( !rc ) goto done;
 665         }
 666
 667         bvin.bv_val = (char *)in;
 668         bvin.bv_len = inlen;
 669         rc = slap_sasl_getdn( conn, NULL, &bvin, (char *)user_realm, &dn,
 670                 (flags & SASL_CU_AUTHID) ? SLAP_GETDN_AUTHCID : SLAP_GETDN_AUTHZID );
 671         if ( rc != LDAP_SUCCESS ) {
 672                 sasl_seterror( sconn, 0, ldap_err2string( rc ) );
 673                 return SASL_NOAUTHZ;
 674         }
 675
 676         names[0] = slap_propnames[which];
 677         names[1] = NULL;
 678         prop_set( props, names[0], (char *)&dn.bv_len, sizeof( dn.bv_len ) );
 679
 680         which++;
 681         names[0] = slap_propnames[which];
 682         prop_set( props, names[0], dn.bv_val, dn.bv_len );
 683
 684         Debug( LDAP_DEBUG_ARGS, "SASL Canonicalize [conn=%ld]: %s=\"%s\"\n",
 685                 conn ? (long) conn->c_connid : -1L, names[0]+1,
 686                 dn.bv_val ? dn.bv_val : "<EMPTY>" );
 687
 688         /* Not needed any more, SASL has copied it */
 689         if ( conn && conn->c_sasl_bindop )
 690                 conn->c_sasl_bindop->o_tmpfree( dn.bv_val, conn->c_sasl_bindop->o_tmpmemctx );
 691
 692 done:
 693         AC_MEMCPY( out, in, inlen );
 694         out[inlen] = '\0';
 695
 696         *out_len = inlen;
 697
 698         return SASL_OK;
 699 }
 700
 701 static int
 702 slap_sasl_authorize(
 703         sasl_conn_t *sconn,
 704         void *context,
 705         char *requested_user,
 706         unsigned rlen,
 707         char *auth_identity,
 708         unsigned alen,
 709         const char *def_realm,
 710         unsigned urlen,
 711         struct propctx *props)
 712 {
 713         Connection *conn = (Connection *)context;
 714         /* actually:
 715          *      (SLAP_SASL_PROP_COUNT - 1)      because we skip "conn",
 716          *      + 1                             for NULL termination?
 717          */
 718         struct propval auxvals[ SLAP_SASL_PROP_COUNT ] = { { 0 } };
 719         struct berval authcDN, authzDN = BER_BVNULL;
 720         int rc;
 721
 722         /* Simple Binds don't support proxy authorization, ignore it */
 723         if ( !conn->c_sasl_bindop ||
 724                 conn->c_sasl_bindop->orb_method != LDAP_AUTH_SASL ) return SASL_OK;
 725
 726         Debug( LDAP_DEBUG_ARGS, "SASL proxy authorize [conn=%ld]: "
 727                 "authcid=\"%s\" authzid=\"%s\"\n",
 728                 conn ? (long) conn->c_connid : -1L, auth_identity, requested_user );
 729         if ( conn->c_sasl_dn.bv_val ) {
 730                 BER_BVZERO( &conn->c_sasl_dn );
 731         }
 732
 733         /* Skip SLAP_SASL_PROP_CONN */
 734         prop_getnames( props, slap_propnames+1, auxvals );
 735
 736         /* Should not happen */
 737         if ( !auxvals[0].values ) {
 738                 sasl_seterror( sconn, 0, "invalid authcid" );
 739                 return SASL_NOAUTHZ;
 740         }
 741
 742         AC_MEMCPY( &authcDN.bv_len, auxvals[0].values[0], sizeof(authcDN.bv_len) );
 743         authcDN.bv_val = auxvals[1].values ? (char *)auxvals[1].values[0] : NULL;
 744         conn->c_sasl_dn = authcDN;
 745
 746         /* Nothing to do if no authzID was given */
 747         if ( !auxvals[2].name || !auxvals[2].values ) {
 748                 goto ok;
 749         }
 750
 751         AC_MEMCPY( &authzDN.bv_len, auxvals[2].values[0], sizeof(authzDN.bv_len) );
 752         authzDN.bv_val = auxvals[3].values ? (char *)auxvals[3].values[0] : NULL;
 753
 754         rc = slap_sasl_authorized( conn->c_sasl_bindop, &authcDN, &authzDN );
 755         if ( rc != LDAP_SUCCESS ) {
 756                 Debug( LDAP_DEBUG_TRACE, "SASL Proxy Authorize [conn=%ld]: "
 757                         "proxy authorization disallowed (%d)\n",
 758                         conn ? (long) conn->c_connid : -1L, rc, 0 );
 759
 760                 sasl_seterror( sconn, 0, "not authorized" );
 761                 return SASL_NOAUTHZ;
 762         }
 763
 764         /* FIXME: we need yet another dup because slap_sasl_getdn()
 765          * is using the bind operation slab */
 766         ber_dupbv( &conn->c_sasl_authz_dn, &authzDN );
 767
 768 ok:
 769         if (conn->c_sasl_bindop) {
 770                 Statslog( LDAP_DEBUG_STATS,
 771                         "%s BIND authcid=\"%s\" authzid=\"%s\"\n",
 772                         conn->c_sasl_bindop->o_log_prefix,
 773                         auth_identity, requested_user, 0, 0 );
 774         }
 775
 776         Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
 777                 " proxy authorization allowed authzDN=\"%s\"\n",
 778                 conn ? (long) conn->c_connid : -1L,
 779                 authzDN.bv_val ? authzDN.bv_val : "", 0 );
 780         return SASL_OK;
 781 }
 782
 783 static int
 784 slap_sasl_err2ldap( int saslerr )
 785 {
 786         int rc;
 787
 788         /* map SASL errors to LDAP resultCode returned by:
 789          *      sasl_server_new()
 790          *              SASL_OK, SASL_NOMEM
 791          *      sasl_server_step()
 792          *              SASL_OK, SASL_CONTINUE, SASL_TRANS, SASL_BADPARAM, SASL_BADPROT,
 793          *      ...
 794          *      sasl_server_start()
 795          *      + SASL_NOMECH
 796          *      sasl_setprop()
 797          *              SASL_OK, SASL_BADPARAM
 798          */
 799
 800         switch (saslerr) {
 801                 case SASL_OK:
 802                         rc = LDAP_SUCCESS;
 803                         break;
 804                 case SASL_CONTINUE:
 805                         rc = LDAP_SASL_BIND_IN_PROGRESS;
 806                         break;
 807                 case SASL_FAIL:
 808                 case SASL_NOMEM:
 809                         rc = LDAP_OTHER;
 810                         break;
 811                 case SASL_NOMECH:
 812                         rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 813                         break;
 814                 case SASL_BADAUTH:
 815                 case SASL_NOUSER:
 816                 case SASL_TRANS:
 817                 case SASL_EXPIRED:
 818                         rc = LDAP_INVALID_CREDENTIALS;
 819                         break;
 820                 case SASL_NOAUTHZ:
 821                         rc = LDAP_INSUFFICIENT_ACCESS;
 822                         break;
 823                 case SASL_TOOWEAK:
 824                 case SASL_ENCRYPT:
 825                         rc = LDAP_INAPPROPRIATE_AUTH;
 826                         break;
 827                 case SASL_UNAVAIL:
 828                 case SASL_TRYAGAIN:
 829                         rc = LDAP_UNAVAILABLE;
 830                         break;
 831                 case SASL_DISABLED:
 832                         rc = LDAP_UNWILLING_TO_PERFORM;
 833                         break;
 834                 default:
 835                         rc = LDAP_OTHER;
 836                         break;
 837         }
 838
 839         return rc;
 840 }
 841
 842 #ifdef SLAPD_SPASSWD
 843
 844 static struct berval sasl_pwscheme = BER_BVC("{SASL}");
 845
 846 static int chk_sasl(
 847         const struct berval *sc,
 848         const struct berval * passwd,
 849         const struct berval * cred,
 850         const char **text )
 851 {
 852         unsigned int i;
 853         int rtn;
 854         void *ctx, *sconn = NULL;
 855
 856         for( i=0; i<cred->bv_len; i++) {
 857                 if(cred->bv_val[i] == '\0') {
 858                         return LUTIL_PASSWD_ERR;        /* NUL character in password */
 859                 }
 860         }
 861
 862         if( cred->bv_val[i] != '\0' ) {
 863                 return LUTIL_PASSWD_ERR;        /* cred must behave like a string */
 864         }
 865
 866         for( i=0; i<passwd->bv_len; i++) {
 867                 if(passwd->bv_val[i] == '\0') {
 868                         return LUTIL_PASSWD_ERR;        /* NUL character in password */
 869                 }
 870         }
 871
 872         if( passwd->bv_val[i] != '\0' ) {
 873                 return LUTIL_PASSWD_ERR;        /* passwd must behave like a string */
 874         }
 875
 876         rtn = LUTIL_PASSWD_ERR;
 877
 878         ctx = ldap_pvt_thread_pool_context();
 879         ldap_pvt_thread_pool_getkey( ctx, (void *)slap_sasl_bind, &sconn, NULL );
 880
 881         if( sconn != NULL ) {
 882                 int sc;
 883                 sc = sasl_checkpass( sconn,
 884                         passwd->bv_val, passwd->bv_len,
 885                         cred->bv_val, cred->bv_len );
 886                 rtn = ( sc != SASL_OK ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 887         }
 888
 889         return rtn;
 890 }
 891 #endif /* SLAPD_SPASSWD */
 892
 893 #endif /* HAVE_CYRUS_SASL */
 894
 895 #ifdef ENABLE_REWRITE
 896
 897 typedef struct slapd_map_data {
 898         struct berval base;
 899         struct berval filter;
 900         AttributeName attrs[2];
 901         int scope;
 902 } slapd_map_data;
 903
 904 static void *
 905 slapd_rw_config( const char *fname, int lineno, int argc, char **argv )
 906 {
 907         slapd_map_data *ret = NULL;
 908         LDAPURLDesc *lud = NULL;
 909         char *uri;
 910         AttributeDescription *ad = NULL;
 911         int rc, flen = 0;
 912         struct berval dn, ndn;
 913
 914         if ( argc != 1 ) {
 915                 Debug( LDAP_DEBUG_ANY,
 916                         "[%s:%d] slapd map needs URI\n",
 917                         fname, lineno, 0 );
 918         return NULL;
 919         }
 920
 921         uri = argv[0];
 922         if ( strncasecmp( uri, "uri=", STRLENOF( "uri=" ) ) == 0 ) {
 923                 uri += STRLENOF( "uri=" );
 924         }
 925
 926         if ( ldap_url_parse( uri, &lud ) != LDAP_URL_SUCCESS ) {
 927                 Debug( LDAP_DEBUG_ANY,
 928                         "[%s:%d] illegal URI '%s'\n",
 929                         fname, lineno, uri );
 930         return NULL;
 931         }
 932
 933         if ( strcasecmp( lud->lud_scheme, "ldap" )) {
 934                 Debug( LDAP_DEBUG_ANY,
 935                         "[%s:%d] illegal URI scheme '%s'\n",
 936                         fname, lineno, lud->lud_scheme );
 937                 goto done;
 938         }
 939
 940         if (( lud->lud_host && lud->lud_host[0] ) || lud->lud_exts
 941                 || !lud->lud_dn ) {
 942                 Debug( LDAP_DEBUG_ANY,
 943                         "[%s:%d] illegal URI '%s'\n",
 944                         fname, lineno, uri );
 945                 goto done;
 946         }
 947
 948         if ( lud->lud_attrs ) {
 949                 if ( lud->lud_attrs[1] ) {
 950                         Debug( LDAP_DEBUG_ANY,
 951                                 "[%s:%d] only one attribute allowed in URI\n",
 952                                 fname, lineno, 0 );
 953                         goto done;
 954                 }
 955                 if ( strcasecmp( lud->lud_attrs[0], "dn" ) &&
 956                         strcasecmp( lud->lud_attrs[0], "entryDN" )) {
 957                         const char *text;
 958                         rc = slap_str2ad( lud->lud_attrs[0], &ad, &text );
 959                         if ( rc )
 960                                 goto done;
 961                 }
 962         }
 963         ber_str2bv( lud->lud_dn, 0, 0, &dn );
 964         if ( dnNormalize( 0, NULL, NULL, &dn, &ndn, NULL ))
 965                 goto done;
 966
 967         if ( lud->lud_filter ) {
 968                 flen = strlen( lud->lud_filter ) + 1;
 969         }
 970         ret = ch_malloc( sizeof( slapd_map_data ) + flen );
 971         ret->base = ndn;
 972         if ( flen ) {
 973                 ret->filter.bv_val = (char *)(ret+1);
 974                 ret->filter.bv_len = flen - 1;
 975                 strcpy( ret->filter.bv_val, lud->lud_filter );
 976         } else {
 977                 BER_BVZERO( &ret->filter );
 978         }
 979         ret->scope = lud->lud_scope;
 980         if ( ad ) {
 981                 ret->attrs[0].an_name = ad->ad_cname;
 982         } else {
 983                 BER_BVZERO( &ret->attrs[0].an_name );
 984         }
 985         ret->attrs[0].an_desc = ad;
 986         BER_BVZERO( &ret->attrs[1].an_name );
 987 done:
 988         ldap_free_urldesc( lud );
 989         return ret;
 990 }
 991
 992 struct slapd_rw_info {
 993         slapd_map_data *si_data;
 994         struct berval si_val;
 995 };
 996
 997 static int
 998 slapd_rw_cb( Operation *op, SlapReply *rs )
 999 {
1000         if ( rs->sr_type == REP_SEARCH ) {
1001                 struct slapd_rw_info *si = op->o_callback->sc_private;
1002
1003                 if ( si->si_data->attrs[0].an_desc ) {
1004                         Attribute *a;
1005
1006                         a = attr_find( rs->sr_entry->e_attrs,
1007                                 si->si_data->attrs[0].an_desc );
1008                         if ( a ) {
1009                                 ber_dupbv( &si->si_val, a->a_vals );
1010                         }
1011                 } else {
1012                         ber_dupbv( &si->si_val, &rs->sr_entry->e_name );
1013                 }
1014         }
1015         return LDAP_SUCCESS;
1016 }
1017
1018 static int
1019 slapd_rw_apply( void *private, const char *filter, struct berval *val )
1020 {
1021         slapd_map_data *sl = private;
1022         slap_callback cb = { NULL };
1023         Connection conn = {0};
1024         OperationBuffer opbuf;
1025         Operation *op;
1026         void *thrctx;
1027         SlapReply rs = {REP_RESULT};
1028         struct slapd_rw_info si;
1029         char *ptr;
1030         int rc;
1031
1032         thrctx = ldap_pvt_thread_pool_context();
1033         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
1034         op = &opbuf.ob_op;
1035
1036         op->o_tag = LDAP_REQ_SEARCH;
1037         op->o_req_dn = op->o_req_ndn = sl->base;
1038         op->o_bd = select_backend( &op->o_req_ndn, 1 );
1039         if ( !op->o_bd ) {
1040                 return REWRITE_ERR;
1041         }
1042         si.si_data = sl;
1043         BER_BVZERO( &si.si_val );
1044         op->ors_scope = sl->scope;
1045         op->ors_deref = LDAP_DEREF_NEVER;
1046         op->ors_slimit = 1;
1047         op->ors_tlimit = SLAP_NO_LIMIT;
1048         if ( sl->attrs[0].an_desc ) {
1049                 op->ors_attrs = sl->attrs;
1050         } else {
1051                 op->ors_attrs = slap_anlist_no_attrs;
1052         }
1053         if ( filter ) {
1054                 rc = strlen( filter );
1055         } else {
1056                 rc = 0;
1057         }
1058         rc += sl->filter.bv_len;
1059         ptr = op->ors_filterstr.bv_val = op->o_tmpalloc( rc + 1, op->o_tmpmemctx );
1060         if ( sl->filter.bv_len ) {
1061                 ptr = lutil_strcopy( ptr, sl->filter.bv_val );
1062         } else {
1063                 *ptr = '\0';
1064         }
1065         if ( filter ) {
1066                 strcpy( ptr, filter );
1067         }
1068         op->ors_filter = str2filter_x( op, op->ors_filterstr.bv_val );
1069         if ( !op->ors_filter ) {
1070                 op->o_tmpfree( op->ors_filterstr.bv_val, op->o_tmpmemctx );
1071                 return REWRITE_ERR;
1072         }
1073
1074         op->ors_attrsonly = 0;
1075         op->o_dn = op->o_bd->be_rootdn;
1076         op->o_ndn = op->o_bd->be_rootndn;
1077         op->o_do_not_cache = 1;
1078
1079         cb.sc_response = slapd_rw_cb;
1080         cb.sc_private = &si;
1081         op->o_callback = &cb;
1082
1083         rc = op->o_bd->be_search( op, &rs );
1084         if ( rc == LDAP_SUCCESS && !BER_BVISNULL( &si.si_val )) {
1085                 *val = si.si_val;
1086                 rc = REWRITE_SUCCESS;
1087         } else {
1088                 if ( !BER_BVISNULL( &si.si_val )) {
1089                         ch_free( si.si_val.bv_val );
1090                 }
1091                 rc = REWRITE_ERR;
1092         }
1093         filter_free_x( op, op->ors_filter, 1 );
1094         op->o_tmpfree( op->ors_filterstr.bv_val, op->o_tmpmemctx );
1095         return rc;
1096 }
1097
1098 static int
1099 slapd_rw_destroy( void *private )
1100 {
1101         slapd_map_data *md = private;
1102
1103         assert( private != NULL );
1104
1105         ch_free( md->base.bv_val );
1106         ch_free( md );
1107
1108         return 0;
1109 }
1110
1111 static const rewrite_mapper slapd_mapper = {
1112         "slapd",
1113         slapd_rw_config,
1114         slapd_rw_apply,
1115         slapd_rw_destroy
1116 };
1117 #endif
1118
1119 int slap_sasl_init( void )
1120 {
1121 #ifdef HAVE_CYRUS_SASL
1122         int rc;
1123         static sasl_callback_t server_callbacks[] = {
1124                 { SASL_CB_LOG, (slap_sasl_cb_ft)&slap_sasl_log, NULL },
1125                 { SASL_CB_GETOPT, (slap_sasl_cb_ft)&slap_sasl_getopt, NULL },
1126                 { SASL_CB_LIST_END, NULL, NULL }
1127         };
1128 #endif
1129
1130 #ifdef ENABLE_REWRITE
1131         rewrite_mapper_register( &slapd_mapper );
1132 #endif
1133
1134 #ifdef HAVE_CYRUS_SASL
1135 #ifdef HAVE_SASL_VERSION
1136         /* stringify the version number, sasl.h doesn't do it for us */
1137 #define VSTR0(maj, min, pat)    #maj "." #min "." #pat
1138 #define VSTR(maj, min, pat)     VSTR0(maj, min, pat)
1139 #define SASL_VERSION_STRING     VSTR(SASL_VERSION_MAJOR, SASL_VERSION_MINOR, \
1140                                 SASL_VERSION_STEP)
1141
1142         sasl_version( NULL, &rc );
1143         if ( ((rc >> 16) != ((SASL_VERSION_MAJOR << 8)|SASL_VERSION_MINOR)) ||
1144                 (rc & 0xffff) < SASL_VERSION_STEP)
1145         {
1146                 char version[sizeof("xxx.xxx.xxxxx")];
1147                 sprintf( version, "%u.%d.%d", (unsigned)rc >> 24, (rc >> 16) & 0xff,
1148                         rc & 0xffff );
1149                 Debug( LDAP_DEBUG_ANY, "slap_sasl_init: SASL library version mismatch:"
1150                         " expected %s, got %s\n",
1151                         SASL_VERSION_STRING, version, 0 );
1152                 return -1;
1153         }
1154 #endif
1155
1156         sasl_set_mutex(
1157                 ldap_pvt_sasl_mutex_new,
1158                 ldap_pvt_sasl_mutex_lock,
1159                 ldap_pvt_sasl_mutex_unlock,
1160                 ldap_pvt_sasl_mutex_dispose );
1161
1162         generic_filter.f_desc = slap_schema.si_ad_objectClass;
1163
1164         rc = sasl_auxprop_add_plugin( "slapd", slap_auxprop_init );
1165         if( rc != SASL_OK ) {
1166                 Debug( LDAP_DEBUG_ANY, "slap_sasl_init: auxprop add plugin failed\n",
1167                         0, 0, 0 );
1168                 return -1;
1169         }
1170
1171         /* should provide callbacks for logging */
1172         /* server name should be configurable */
1173         rc = sasl_server_init( server_callbacks, "slapd" );
1174
1175         if( rc != SASL_OK ) {
1176                 Debug( LDAP_DEBUG_ANY, "slap_sasl_init: server init failed\n",
1177                         0, 0, 0 );
1178
1179                 return -1;
1180         }
1181
1182 #ifdef SLAPD_SPASSWD
1183         lutil_passwd_add( &sasl_pwscheme, chk_sasl, NULL );
1184 #endif
1185
1186         Debug( LDAP_DEBUG_TRACE, "slap_sasl_init: initialized!\n",
1187                 0, 0, 0 );
1188
1189         /* default security properties */
1190         memset( &sasl_secprops, '\0', sizeof(sasl_secprops) );
1191         sasl_secprops.max_ssf = INT_MAX;
1192         sasl_secprops.maxbufsize = 65536;
1193         sasl_secprops.security_flags = SASL_SEC_NOPLAINTEXT|SASL_SEC_NOANONYMOUS;
1194 #endif
1195
1196         return 0;
1197 }
1198
1199 int slap_sasl_destroy( void )
1200 {
1201 #ifdef HAVE_CYRUS_SASL
1202         sasl_done();
1203 #endif
1204         free( sasl_host );
1205         sasl_host = NULL;
1206
1207         return 0;
1208 }
1209
1210 static char *
1211 slap_sasl_peer2ipport( struct berval *peer )
1212 {
1213         int             isv6 = 0;
1214         char            *ipport, *p,
1215                         *addr = &peer->bv_val[ STRLENOF( "IP=" ) ];
1216         ber_len_t       plen = peer->bv_len - STRLENOF( "IP=" );
1217
1218         /* IPv6? */
1219         if ( addr[0] == '[' ) {
1220                 isv6 = 1;
1221                 plen--;
1222         }
1223         ipport = ch_strdup( &addr[isv6] );
1224
1225         /* Convert IPv6/IPv4 addresses to address;port syntax. */
1226         p = strrchr( ipport, ':' );
1227         if ( p != NULL ) {
1228                 *p = ';';
1229                 if ( isv6 ) {
1230                         assert( p[-1] == ']' );
1231                         AC_MEMCPY( &p[-1], p, plen - ( p - ipport ) + 1 );
1232                 }
1233
1234         } else if ( isv6 ) {
1235                 /* trim ']' */
1236                 plen--;
1237                 assert( addr[plen] == ']' );
1238                 addr[plen] = '\0';
1239         }
1240
1241         return ipport;
1242 }
1243
1244 int slap_sasl_open( Connection *conn, int reopen )
1245 {
1246         int sc = LDAP_SUCCESS;
1247 #ifdef HAVE_CYRUS_SASL
1248         int cb;
1249
1250         sasl_conn_t *ctx = NULL;
1251         sasl_callback_t *session_callbacks;
1252         char *ipremoteport = NULL, *iplocalport = NULL;
1253
1254         assert( conn->c_sasl_authctx == NULL );
1255
1256         if ( !reopen ) {
1257                 assert( conn->c_sasl_extra == NULL );
1258
1259                 session_callbacks =
1260                         SLAP_CALLOC( 5, sizeof(sasl_callback_t));
1261                 if( session_callbacks == NULL ) {
1262                         Debug( LDAP_DEBUG_ANY,
1263                                 "slap_sasl_open: SLAP_MALLOC failed", 0, 0, 0 );
1264                         return -1;
1265                 }
1266                 conn->c_sasl_extra = session_callbacks;
1267
1268                 session_callbacks[cb=0].id = SASL_CB_LOG;
1269                 session_callbacks[cb].proc = (slap_sasl_cb_ft)&slap_sasl_log;
1270                 session_callbacks[cb++].context = conn;
1271
1272                 session_callbacks[cb].id = SASL_CB_PROXY_POLICY;
1273                 session_callbacks[cb].proc = (slap_sasl_cb_ft)&slap_sasl_authorize;
1274                 session_callbacks[cb++].context = conn;
1275
1276                 session_callbacks[cb].id = SASL_CB_CANON_USER;
1277                 session_callbacks[cb].proc = (slap_sasl_cb_ft)&slap_sasl_canonicalize;
1278                 session_callbacks[cb++].context = conn;
1279
1280                 session_callbacks[cb].id = SASL_CB_LIST_END;
1281                 session_callbacks[cb].proc = NULL;
1282                 session_callbacks[cb++].context = NULL;
1283         } else {
1284                 session_callbacks = conn->c_sasl_extra;
1285         }
1286
1287         conn->c_sasl_layers = 0;
1288
1289         /* create new SASL context */
1290         if ( conn->c_sock_name.bv_len != 0 &&
1291                 strncmp( conn->c_sock_name.bv_val, "IP=", STRLENOF( "IP=" ) ) == 0 )
1292         {
1293                 iplocalport = slap_sasl_peer2ipport( &conn->c_sock_name );
1294         }
1295
1296         if ( conn->c_peer_name.bv_len != 0 &&
1297                 strncmp( conn->c_peer_name.bv_val, "IP=", STRLENOF( "IP=" ) ) == 0 )
1298         {
1299                 ipremoteport = slap_sasl_peer2ipport( &conn->c_peer_name );
1300         }
1301
1302         sc = sasl_server_new( "ldap", sasl_host, global_realm,
1303                 iplocalport, ipremoteport, session_callbacks, SASL_SUCCESS_DATA, &ctx );
1304         if ( iplocalport != NULL ) {
1305                 ch_free( iplocalport );
1306         }
1307         if ( ipremoteport != NULL ) {
1308                 ch_free( ipremoteport );
1309         }
1310
1311         if( sc != SASL_OK ) {
1312                 Debug( LDAP_DEBUG_ANY, "sasl_server_new failed: %d\n",
1313                         sc, 0, 0 );
1314
1315                 return -1;
1316         }
1317
1318         conn->c_sasl_authctx = ctx;
1319
1320         if( sc == SASL_OK ) {
1321                 sc = sasl_setprop( ctx,
1322                         SASL_SEC_PROPS, &sasl_secprops );
1323
1324                 if( sc != SASL_OK ) {
1325                         Debug( LDAP_DEBUG_ANY, "sasl_setprop failed: %d\n",
1326                                 sc, 0, 0 );
1327
1328                         slap_sasl_close( conn );
1329                         return -1;
1330                 }
1331         }
1332
1333         sc = slap_sasl_err2ldap( sc );
1334
1335 #elif defined(SLAP_BUILTIN_SASL)
1336         /* built-in SASL implementation */
1337         SASL_CTX *ctx = (SASL_CTX *) SLAP_MALLOC(sizeof(SASL_CTX));
1338         if( ctx == NULL ) return -1;
1339
1340         ctx->sc_external_ssf = 0;
1341         BER_BVZERO( &ctx->sc_external_id );
1342
1343         conn->c_sasl_authctx = ctx;
1344 #endif
1345
1346         return sc;
1347 }
1348
1349 int slap_sasl_external(
1350         Connection *conn,
1351         slap_ssf_t ssf,
1352         struct berval *auth_id )
1353 {
1354 #ifdef HAVE_CYRUS_SASL
1355         int sc;
1356         sasl_conn_t *ctx = conn->c_sasl_authctx;
1357         sasl_ssf_t sasl_ssf = ssf;
1358
1359         if ( ctx == NULL ) {
1360                 return LDAP_UNAVAILABLE;
1361         }
1362
1363         sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL, &sasl_ssf );
1364
1365         if ( sc != SASL_OK ) {
1366                 return LDAP_OTHER;
1367         }
1368
1369         sc = sasl_setprop( ctx, SASL_AUTH_EXTERNAL,
1370                 auth_id ? auth_id->bv_val : NULL );
1371
1372         if ( sc != SASL_OK ) {
1373                 return LDAP_OTHER;
1374         }
1375 #elif defined(SLAP_BUILTIN_SASL)
1376         /* built-in SASL implementation */
1377         SASL_CTX *ctx = conn->c_sasl_authctx;
1378         if ( ctx == NULL ) return LDAP_UNAVAILABLE;
1379
1380         ctx->sc_external_ssf = ssf;
1381         if( auth_id ) {
1382                 ctx->sc_external_id = *auth_id;
1383                 BER_BVZERO( auth_id );
1384         } else {
1385                 BER_BVZERO( &ctx->sc_external_id );
1386         }
1387 #endif
1388
1389         return LDAP_SUCCESS;
1390 }
1391
1392 int slap_sasl_reset( Connection *conn )
1393 {
1394         return LDAP_SUCCESS;
1395 }
1396
1397 char ** slap_sasl_mechs( Connection *conn )
1398 {
1399         char **mechs = NULL;
1400
1401 #ifdef HAVE_CYRUS_SASL
1402         sasl_conn_t *ctx = conn->c_sasl_authctx;
1403
1404         if( ctx == NULL ) ctx = conn->c_sasl_sockctx;
1405
1406         if( ctx != NULL ) {
1407                 int sc;
1408                 SASL_CONST char *mechstr;
1409
1410                 sc = sasl_listmech( ctx,
1411                         NULL, NULL, ",", NULL,
1412                         &mechstr, NULL, NULL );
1413
1414                 if( sc != SASL_OK ) {
1415                         Debug( LDAP_DEBUG_ANY, "slap_sasl_listmech failed: %d\n",
1416                                 sc, 0, 0 );
1417
1418                         return NULL;
1419                 }
1420
1421                 mechs = ldap_str2charray( mechstr, "," );
1422         }
1423 #elif defined(SLAP_BUILTIN_SASL)
1424         /* builtin SASL implementation */
1425         SASL_CTX *ctx = conn->c_sasl_authctx;
1426         if ( ctx != NULL && ctx->sc_external_id.bv_val ) {
1427                 /* should check ssf */
1428                 mechs = ldap_str2charray( "EXTERNAL", "," );
1429         }
1430 #endif
1431
1432         return mechs;
1433 }
1434
1435 int slap_sasl_close( Connection *conn )
1436 {
1437 #ifdef HAVE_CYRUS_SASL
1438         sasl_conn_t *ctx = conn->c_sasl_authctx;
1439
1440         if( ctx != NULL ) {
1441                 sasl_dispose( &ctx );
1442         }
1443         if ( conn->c_sasl_sockctx &&
1444                 conn->c_sasl_authctx != conn->c_sasl_sockctx )
1445         {
1446                 ctx = conn->c_sasl_sockctx;
1447                 sasl_dispose( &ctx );
1448         }
1449
1450         conn->c_sasl_authctx = NULL;
1451         conn->c_sasl_sockctx = NULL;
1452         conn->c_sasl_done = 0;
1453
1454         free( conn->c_sasl_extra );
1455         conn->c_sasl_extra = NULL;
1456
1457 #elif defined(SLAP_BUILTIN_SASL)
1458         SASL_CTX *ctx = conn->c_sasl_authctx;
1459         if( ctx ) {
1460                 if( ctx->sc_external_id.bv_val ) {
1461                         free( ctx->sc_external_id.bv_val );
1462                         BER_BVZERO( &ctx->sc_external_id );
1463                 }
1464                 free( ctx );
1465                 conn->c_sasl_authctx = NULL;
1466         }
1467 #endif
1468
1469         return LDAP_SUCCESS;
1470 }
1471
1472 int slap_sasl_bind( Operation *op, SlapReply *rs )
1473 {
1474 #ifdef HAVE_CYRUS_SASL
1475         sasl_conn_t *ctx = op->o_conn->c_sasl_authctx;
1476         struct berval response;
1477         unsigned reslen = 0;
1478         int sc;
1479
1480         Debug(LDAP_DEBUG_ARGS,
1481                 "==> sasl_bind: dn=\"%s\" mech=%s datalen=%ld\n",
1482                 op->o_req_dn.bv_len ? op->o_req_dn.bv_val : "",
1483                 op->o_conn->c_sasl_bind_in_progress ? "<continuing>" :
1484                 op->o_conn->c_sasl_bind_mech.bv_val,
1485                 op->orb_cred.bv_len );
1486
1487         if( ctx == NULL ) {
1488                 send_ldap_error( op, rs, LDAP_UNAVAILABLE,
1489                         "SASL unavailable on this session" );
1490                 return rs->sr_err;
1491         }
1492
1493 #define START( ctx, mech, cred, clen, resp, rlen, err ) \
1494         sasl_server_start( ctx, mech, cred, clen, resp, rlen )
1495 #define STEP( ctx, cred, clen, resp, rlen, err ) \
1496         sasl_server_step( ctx, cred, clen, resp, rlen )
1497
1498         if ( !op->o_conn->c_sasl_bind_in_progress ) {
1499                 /* If we already authenticated once, must use a new context */
1500                 if ( op->o_conn->c_sasl_done ) {
1501                         sasl_ssf_t ssf = 0;
1502                         sasl_ssf_t *ssfp = NULL;
1503                         const char *authid = NULL;
1504
1505                         sasl_getprop( ctx, SASL_SSF_EXTERNAL, (void *)&ssfp );
1506                         if ( ssfp ) ssf = *ssfp;
1507
1508                         sasl_getprop( ctx, SASL_AUTH_EXTERNAL, (void *)&authid );
1509                         if ( authid ) authid = ch_strdup( authid );
1510
1511                         if ( ctx != op->o_conn->c_sasl_sockctx ) {
1512                                 sasl_dispose( &ctx );
1513                         }
1514                         op->o_conn->c_sasl_authctx = NULL;
1515
1516                         slap_sasl_open( op->o_conn, 1 );
1517                         ctx = op->o_conn->c_sasl_authctx;
1518                         sasl_setprop( ctx, SASL_SSF_EXTERNAL, &ssf );
1519                         if ( authid ) {
1520                                 sasl_setprop( ctx, SASL_AUTH_EXTERNAL, authid );
1521                                 ch_free( (char *)authid );
1522                         }
1523                 }
1524                 sc = START( ctx,
1525                         op->o_conn->c_sasl_bind_mech.bv_val,
1526                         op->orb_cred.bv_val, op->orb_cred.bv_len,
1527                         (SASL_CONST char **)&response.bv_val, &reslen, &rs->sr_text );
1528
1529         } else {
1530                 sc = STEP( ctx,
1531                         op->orb_cred.bv_val, op->orb_cred.bv_len,
1532                         (SASL_CONST char **)&response.bv_val, &reslen, &rs->sr_text );
1533         }
1534
1535         response.bv_len = reslen;
1536
1537         if ( sc == SASL_OK ) {
1538                 sasl_ssf_t *ssf = NULL;
1539
1540                 ber_dupbv_x( &op->orb_edn, &op->o_conn->c_sasl_dn, op->o_tmpmemctx );
1541                 BER_BVZERO( &op->o_conn->c_sasl_dn );
1542                 op->o_conn->c_sasl_done = 1;
1543
1544                 rs->sr_err = LDAP_SUCCESS;
1545
1546                 (void) sasl_getprop( ctx, SASL_SSF, (void *)&ssf );
1547                 op->orb_ssf = ssf ? *ssf : 0;
1548
1549                 ctx = NULL;
1550                 if( op->orb_ssf ) {
1551                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1552                         op->o_conn->c_sasl_layers++;
1553
1554                         /* If there's an old layer, set sockctx to NULL to
1555                          * tell connection_read() to wait for us to finish.
1556                          * Otherwise there is a race condition: we have to
1557                          * send the Bind response using the old security
1558                          * context and then remove it before reading any
1559                          * new messages.
1560                          */
1561                         if ( op->o_conn->c_sasl_sockctx ) {
1562                                 ctx = op->o_conn->c_sasl_sockctx;
1563                                 op->o_conn->c_sasl_sockctx = NULL;
1564                         } else {
1565                                 op->o_conn->c_sasl_sockctx = op->o_conn->c_sasl_authctx;
1566                         }
1567                         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1568                 }
1569
1570                 /* Must send response using old security layer */
1571                 rs->sr_sasldata = (response.bv_len ? &response : NULL);
1572                 send_ldap_sasl( op, rs );
1573
1574                 /* Now dispose of the old security layer.
1575                  */
1576                 if ( ctx ) {
1577                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1578                         ldap_pvt_sasl_remove( op->o_conn->c_sb );
1579                         op->o_conn->c_sasl_sockctx = op->o_conn->c_sasl_authctx;
1580                         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1581                         sasl_dispose( &ctx );
1582                 }
1583         } else if ( sc == SASL_CONTINUE ) {
1584                 rs->sr_err = LDAP_SASL_BIND_IN_PROGRESS,
1585                 rs->sr_text = sasl_errdetail( ctx );
1586                 rs->sr_sasldata = &response;
1587                 send_ldap_sasl( op, rs );
1588
1589         } else {
1590                 BER_BVZERO( &op->o_conn->c_sasl_dn );
1591                 rs->sr_text = sasl_errdetail( ctx );
1592                 rs->sr_err = slap_sasl_err2ldap( sc ),
1593                 send_ldap_result( op, rs );
1594         }
1595
1596         Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: rc=%d\n", rs->sr_err, 0, 0);
1597
1598 #elif defined(SLAP_BUILTIN_SASL)
1599         /* built-in SASL implementation */
1600         SASL_CTX *ctx = op->o_conn->c_sasl_authctx;
1601
1602         if ( ctx == NULL ) {
1603                 send_ldap_error( op, rs, LDAP_OTHER,
1604                         "Internal SASL Error" );
1605
1606         } else if ( bvmatch( &ext_bv, &op->o_conn->c_sasl_bind_mech ) ) {
1607                 /* EXTERNAL */
1608
1609                 if( op->orb_cred.bv_len ) {
1610                         rs->sr_text = "proxy authorization not supported";
1611                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
1612                         send_ldap_result( op, rs );
1613
1614                 } else {
1615                         op->orb_edn = ctx->sc_external_id;
1616                         rs->sr_err = LDAP_SUCCESS;
1617                         rs->sr_sasldata = NULL;
1618                         send_ldap_sasl( op, rs );
1619                 }
1620
1621         } else {
1622                 send_ldap_error( op, rs, LDAP_AUTH_METHOD_NOT_SUPPORTED,
1623                         "requested SASL mechanism not supported" );
1624         }
1625 #else
1626         send_ldap_error( op, rs, LDAP_AUTH_METHOD_NOT_SUPPORTED,
1627                 "SASL not supported" );
1628 #endif
1629
1630         return rs->sr_err;
1631 }
1632
1633 char* slap_sasl_secprops( const char *in )
1634 {
1635 #ifdef HAVE_CYRUS_SASL
1636         int rc = ldap_pvt_sasl_secprops( in, &sasl_secprops );
1637
1638         return rc == LDAP_SUCCESS ? NULL : "Invalid security properties";
1639 #else
1640         return "SASL not supported";
1641 #endif
1642 }
1643
1644 void slap_sasl_secprops_unparse( struct berval *bv )
1645 {
1646 #ifdef HAVE_CYRUS_SASL
1647         ldap_pvt_sasl_secprops_unparse( &sasl_secprops, bv );
1648 #endif
1649 }
1650
1651 #ifdef HAVE_CYRUS_SASL
1652 int
1653 slap_sasl_setpass( Operation *op, SlapReply *rs )
1654 {
1655         struct berval id = BER_BVNULL;  /* needs to come from connection */
1656         struct berval new = BER_BVNULL;
1657         struct berval old = BER_BVNULL;
1658
1659         assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
1660
1661         rs->sr_err = sasl_getprop( op->o_conn->c_sasl_authctx, SASL_USERNAME,
1662                 (SASL_CONST void **)(char *)&id.bv_val );
1663
1664         if( rs->sr_err != SASL_OK ) {
1665                 rs->sr_text = "unable to retrieve SASL username";
1666                 rs->sr_err = LDAP_OTHER;
1667                 goto done;
1668         }
1669
1670         Debug( LDAP_DEBUG_ARGS, "==> slap_sasl_setpass: \"%s\"\n",
1671                 id.bv_val ? id.bv_val : "", 0, 0 );
1672
1673         rs->sr_err = slap_passwd_parse( op->ore_reqdata,
1674                 NULL, &old, &new, &rs->sr_text );
1675
1676         if( rs->sr_err != LDAP_SUCCESS ) {
1677                 goto done;
1678         }
1679
1680         if( new.bv_len == 0 ) {
1681                 slap_passwd_generate(&new);
1682
1683                 if( new.bv_len == 0 ) {
1684                         rs->sr_text = "password generation failed.";
1685                         rs->sr_err = LDAP_OTHER;
1686                         goto done;
1687                 }
1688
1689                 rs->sr_rspdata = slap_passwd_return( &new );
1690         }
1691
1692         rs->sr_err = sasl_setpass( op->o_conn->c_sasl_authctx, id.bv_val,
1693                 new.bv_val, new.bv_len, old.bv_val, old.bv_len, 0 );
1694         if( rs->sr_err != SASL_OK ) {
1695                 rs->sr_text = sasl_errdetail( op->o_conn->c_sasl_authctx );
1696         }
1697         switch(rs->sr_err) {
1698                 case SASL_OK:
1699                         rs->sr_err = LDAP_SUCCESS;
1700                         break;
1701
1702                 case SASL_NOCHANGE:
1703                 case SASL_NOMECH:
1704                 case SASL_DISABLED:
1705                 case SASL_PWLOCK:
1706                 case SASL_FAIL:
1707                 case SASL_BADPARAM:
1708                 default:
1709                         rs->sr_err = LDAP_OTHER;
1710         }
1711
1712 done:
1713         return rs->sr_err;
1714 }
1715 #endif /* HAVE_CYRUS_SASL */
1716
1717 /* Take any sort of identity string and return a DN with the "dn:" prefix. The
1718  * string returned in *dn is in its own allocated memory, and must be free'd
1719  * by the calling process.  -Mark Adamson, Carnegie Mellon
1720  *
1721  * The "dn:" prefix is no longer used anywhere inside slapd. It is only used
1722  * on strings passed in directly from SASL.  -Howard Chu, Symas Corp.
1723  */
1724
1725 #define SET_NONE        0
1726 #define SET_DN          1
1727 #define SET_U           2
1728
1729 int slap_sasl_getdn( Connection *conn, Operation *op, struct berval *id,
1730         char *user_realm, struct berval *dn, int flags )
1731 {
1732         int rc, is_dn = SET_NONE, do_norm = 1;
1733         struct berval dn2, *mech;
1734
1735         assert( conn != NULL );
1736         assert( id != NULL );
1737
1738         Debug( LDAP_DEBUG_ARGS, "slap_sasl_getdn: conn %lu id=%s [len=%lu]\n",
1739                 conn->c_connid,
1740                 BER_BVISNULL( id ) ? "NULL" : ( BER_BVISEMPTY( id ) ? "<empty>" : id->bv_val ),
1741                 BER_BVISNULL( id ) ? 0 : ( BER_BVISEMPTY( id ) ? 0 :
1742                                            (unsigned long) id->bv_len ) );
1743
1744         if ( !op ) {
1745                 op = conn->c_sasl_bindop;
1746         }
1747         assert( op != NULL );
1748
1749         BER_BVZERO( dn );
1750
1751         if ( !BER_BVISNULL( id ) ) {
1752                 /* Blatantly anonymous ID */
1753                 static struct berval bv_anonymous = BER_BVC( "anonymous" );
1754
1755                 if ( ber_bvstrcasecmp( id, &bv_anonymous ) == 0 ) {
1756                         return( LDAP_SUCCESS );
1757                 }
1758
1759         } else {
1760                 /* FIXME: if empty, should we stop? */
1761                 BER_BVSTR( id, "" );
1762         }
1763
1764         if ( !BER_BVISEMPTY( &conn->c_sasl_bind_mech ) ) {
1765                 mech = &conn->c_sasl_bind_mech;
1766         } else {
1767                 mech = &conn->c_authmech;
1768         }
1769
1770         /* An authcID needs to be converted to authzID form. Set the
1771          * values directly into *dn; they will be normalized later. (and
1772          * normalizing always makes a new copy.) An ID from a TLS certificate
1773          * is already normalized, so copy it and skip normalization.
1774          */
1775         if( flags & SLAP_GETDN_AUTHCID ) {
1776                 if( bvmatch( mech, &ext_bv )) {
1777                         /* EXTERNAL DNs are already normalized */
1778                         assert( !BER_BVISNULL( id ) );
1779
1780                         do_norm = 0;
1781                         is_dn = SET_DN;
1782                         ber_dupbv_x( dn, id, op->o_tmpmemctx );
1783
1784                 } else {
1785                         /* convert to u:<username> form */
1786                         is_dn = SET_U;
1787                         *dn = *id;
1788                 }
1789         }
1790
1791         if( is_dn == SET_NONE ) {
1792                 if( !strncasecmp( id->bv_val, "u:", STRLENOF( "u:" ) ) ) {
1793                         is_dn = SET_U;
1794                         dn->bv_val = id->bv_val + STRLENOF( "u:" );
1795                         dn->bv_len = id->bv_len - STRLENOF( "u:" );
1796
1797                 } else if ( !strncasecmp( id->bv_val, "dn:", STRLENOF( "dn:" ) ) ) {
1798                         is_dn = SET_DN;
1799                         dn->bv_val = id->bv_val + STRLENOF( "dn:" );
1800                         dn->bv_len = id->bv_len - STRLENOF( "dn:" );
1801                 }
1802         }
1803
1804         /* No other possibilities from here */
1805         if( is_dn == SET_NONE ) {
1806                 BER_BVZERO( dn );
1807                 return( LDAP_INAPPROPRIATE_AUTH );
1808         }
1809
1810         /* Username strings */
1811         if( is_dn == SET_U ) {
1812                 /* ITS#3419: values may need escape */
1813                 LDAPRDN         DN[ 5 ];
1814                 LDAPAVA         *RDNs[ 4 ][ 2 ];
1815                 LDAPAVA         AVAs[ 4 ];
1816                 int             irdn;
1817
1818                 irdn = 0;
1819                 DN[ irdn ] = RDNs[ irdn ];
1820                 RDNs[ irdn ][ 0 ] = &AVAs[ irdn ];
1821                 AVAs[ irdn ].la_attr = slap_schema.si_ad_uid->ad_cname;
1822                 AVAs[ irdn ].la_value = *dn;
1823                 AVAs[ irdn ].la_flags = LDAP_AVA_NULL;
1824                 AVAs[ irdn ].la_private = NULL;
1825                 RDNs[ irdn ][ 1 ] = NULL;
1826
1827                 if ( user_realm && *user_realm ) {
1828                         irdn++;
1829                         DN[ irdn ] = RDNs[ irdn ];
1830                         RDNs[ irdn ][ 0 ] = &AVAs[ irdn ];
1831                         AVAs[ irdn ].la_attr = slap_schema.si_ad_cn->ad_cname;
1832                         ber_str2bv( user_realm, 0, 0, &AVAs[ irdn ].la_value );
1833                         AVAs[ irdn ].la_flags = LDAP_AVA_NULL;
1834                         AVAs[ irdn ].la_private = NULL;
1835                         RDNs[ irdn ][ 1 ] = NULL;
1836                 }
1837
1838                 if ( !BER_BVISNULL( mech ) ) {
1839                         irdn++;
1840                         DN[ irdn ] = RDNs[ irdn ];
1841                         RDNs[ irdn ][ 0 ] = &AVAs[ irdn ];
1842                         AVAs[ irdn ].la_attr = slap_schema.si_ad_cn->ad_cname;
1843                         AVAs[ irdn ].la_value = *mech;
1844                         AVAs[ irdn ].la_flags = LDAP_AVA_NULL;
1845                         AVAs[ irdn ].la_private = NULL;
1846                         RDNs[ irdn ][ 1 ] = NULL;
1847                 }
1848
1849                 irdn++;
1850                 DN[ irdn ] = RDNs[ irdn ];
1851                 RDNs[ irdn ][ 0 ] = &AVAs[ irdn ];
1852                 AVAs[ irdn ].la_attr = slap_schema.si_ad_cn->ad_cname;
1853                 BER_BVSTR( &AVAs[ irdn ].la_value, "auth" );
1854                 AVAs[ irdn ].la_flags = LDAP_AVA_NULL;
1855                 AVAs[ irdn ].la_private = NULL;
1856                 RDNs[ irdn ][ 1 ] = NULL;
1857
1858                 irdn++;
1859                 DN[ irdn ] = NULL;
1860
1861                 rc = ldap_dn2bv_x( DN, dn, LDAP_DN_FORMAT_LDAPV3,
1862                                 op->o_tmpmemctx );
1863                 if ( rc != LDAP_SUCCESS ) {
1864                         BER_BVZERO( dn );
1865                         return rc;
1866                 }
1867
1868                 Debug( LDAP_DEBUG_TRACE,
1869                         "slap_sasl_getdn: u:id converted to %s\n",
1870                         dn->bv_val, 0, 0 );
1871
1872         } else {
1873
1874                 /* Dup the DN in any case, so we don't risk
1875                  * leaks or dangling pointers later,
1876                  * and the DN value is '\0' terminated */
1877                 ber_dupbv_x( &dn2, dn, op->o_tmpmemctx );
1878                 dn->bv_val = dn2.bv_val;
1879         }
1880
1881         /* All strings are in DN form now. Normalize if needed. */
1882         if ( do_norm ) {
1883                 rc = dnNormalize( 0, NULL, NULL, dn, &dn2, op->o_tmpmemctx );
1884
1885                 /* User DNs were constructed above and must be freed now */
1886                 slap_sl_free( dn->bv_val, op->o_tmpmemctx );
1887
1888                 if ( rc != LDAP_SUCCESS ) {
1889                         BER_BVZERO( dn );
1890                         return rc;
1891                 }
1892                 *dn = dn2;
1893         }
1894
1895         /* Run thru regexp */
1896         slap_sasl2dn( op, dn, &dn2, flags );
1897         if( !BER_BVISNULL( &dn2 ) ) {
1898                 slap_sl_free( dn->bv_val, op->o_tmpmemctx );
1899                 *dn = dn2;
1900                 Debug( LDAP_DEBUG_TRACE,
1901                         "slap_sasl_getdn: dn:id converted to %s\n",
1902                         dn->bv_val, 0, 0 );
1903         }
1904
1905         return( LDAP_SUCCESS );
1906 }