mirror of
https://git.openldap.org/openldap/openldap.git
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322 lines
8.9 KiB
C
322 lines
8.9 KiB
C
/*
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* Copyright (c) 1998 Will Ballantyne, ITSD, Government of BC
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to ITSD, Government of BC. The name of ITSD
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/string.h>
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#include <ac/socket.h>
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#include "slap.h"
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#include "back-ldbm.h"
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#include "proto-back-ldbm.h"
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/*
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* given an alias object, dereference it to its end point.
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* Entry returned has reader lock or is NULL. Starting entry is not released.
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*/
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Entry *derefAlias_r ( Backend *be,
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Connection *conn,
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Operation *op,
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Entry *e)
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private; /* to free cache entries */
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Attribute *a;
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int depth;
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char *matched;
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Entry *origDN = e;
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if (!e) return NULL; /* be sure we have a starting entry */
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Debug( LDAP_DEBUG_TRACE, "<= checking for alias for dn %s\n", e->e_dn, 0, 0 );
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/*
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* try to deref fully, up to a maximum depth. If the max depth exceeded
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* then send an error
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*/
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for ( depth = 0;
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( ( a = attr_find( e->e_attrs, "aliasedobjectname" ) ) != NULL) &&
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( depth < be->be_maxDerefDepth );
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++depth)
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{
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/*
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* make sure there is a defined aliasedobjectname.
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* can only have one value so just use first value (0) in the attr list.
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*/
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if (a->a_vals[0] && a->a_vals[0]->bv_val) {
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char *newDN, *oldDN;
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Debug( LDAP_DEBUG_TRACE, "<= %s is an alias for %s\n",
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e->e_dn, a->a_vals[0]->bv_val, 0 );
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newDN = ch_strdup (a->a_vals[0]->bv_val);
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oldDN = ch_strdup (e->e_ndn);
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/*
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* release past lock if not original
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*/
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if ( (depth > 0) && e ) {
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cache_return_entry_r(&li->li_cache, e);
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}
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/* make sure new and old DN are not same to avoid loops */
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dn_normalize_case (newDN);
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if ( strcmp (newDN, oldDN) == 0 ) {
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Debug( LDAP_DEBUG_TRACE,
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"<= %s alias is same as current %s\n",
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oldDN, newDN, 0 );
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send_ldap_result( conn, op, LDAP_ALIAS_DEREF_PROBLEM, "",
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"Circular alias" );
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free (newDN);
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free (oldDN);
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break;
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}
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/* make sure new and original are not same to avoid deadlocks */
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if ( strcmp (newDN, origDN->e_ndn) == 0 ) {
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Debug( LDAP_DEBUG_TRACE,
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"<= %s alias is same as original %s\n",
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oldDN, origDN->e_ndn, 0 );
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send_ldap_result( conn, op, LDAP_ALIAS_DEREF_PROBLEM, "",
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"Circular alias" );
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free (newDN);
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free (oldDN);
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break;
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}
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/*
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* ok, so what happens if there is an alias in the DN of a dereferenced
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* alias object?
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*/
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if ( (e = dn2entry_r( be, newDN, &matched )) == NULL ) {
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/* could not deref return error */
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Debug( LDAP_DEBUG_TRACE,
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"<= %s is a dangling alias to %s\n",
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oldDN, newDN, 0 );
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send_ldap_result( conn, op, LDAP_ALIAS_DEREF_PROBLEM, "",
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"Dangling Alias" );
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if (matched != NULL) free(matched);
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free (newDN);
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free (oldDN);
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break;
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}
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free (newDN);
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free (oldDN);
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}
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else {
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/*
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* there was an aliasedobjectname defined but no data.
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* this can't happen, right?
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*/
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Debug( LDAP_DEBUG_TRACE,
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"<= %s has no data in aliasedobjectname attribute\n",
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(e && e->e_dn) ? e->e_dn : "(null)", 0, 0 );
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send_ldap_result( conn, op, LDAP_ALIAS_PROBLEM, "",
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"Alias missing aliasedobjectname" );
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break;
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}
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}
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/*
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* warn if we pulled out due to exceeding the maximum deref depth
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*/
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if ( depth >= be->be_maxDerefDepth ) {
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Debug( LDAP_DEBUG_TRACE,
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"<= deref(\"%s\") exceeded maximum deref depth (%d) at \"%s\"\n",
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origDN->e_dn ? origDN->e_dn : "(null)",
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be->be_maxDerefDepth,
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(e && e->e_ndn) ? e->e_ndn : "(null)");
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send_ldap_result( conn, op, LDAP_ALIAS_DEREF_PROBLEM, "",
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"Maximum alias dereference depth exceeded" );
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}
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return e;
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}
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/*
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* given a DN fully deref it and return the real DN or original DN if it fails
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* This involves finding the last matched part then reconstructing forward
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* e.g.
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* ou=MyOU,o=MyAliasedOrg,c=MyCountry where o=MyAliasedOrg is an alias for o=MyOrg
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* loop starts with newDN = ou=MyOU,o=MyAliasedOrg,c=MyCountry
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* dn2entry_r on newDN gives null entry and o=MyAliasedOrg,c=MyCountry matched
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* dn2entry_r on matched gives o=MyAliasedOrg,c=MyCountry entry
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* remainder is ou=MyOU
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* dereferencing o=MyAliasedOrg,c=MyCountry yields entry o=MyOrg,c=MyCountry
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* release lock on o=MyAliasedOrg,c=MyCountry entry
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* reconstructed dn is ou=MyOU,o=MyOrg,c=MyCountry
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* release lock on o=MyOrg,c=MyCountry entry
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*/
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char *derefDN ( Backend *be,
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Connection *conn,
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Operation *op,
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char *dn
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)
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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char *matched = 0;
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char *newDN = NULL;
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int depth, i;
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Entry *eMatched;
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Entry *eDeref;
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Entry *eNew;
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if (!dn) return NULL;
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Debug( LDAP_DEBUG_TRACE,
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"<= dereferencing dn: \"%s\"\n",
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dn, 0, 0 );
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newDN = ch_strdup ( dn );
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/* while we don't have a matched dn, deref the DN */
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for ( depth = 0;
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( (eMatched = dn2entry_r( be, newDN, &matched )) == NULL) &&
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(depth < be->be_maxDerefDepth);
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++depth ) {
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if ((matched != NULL) && *matched) {
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char *submatch;
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/*
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* make sure there actually is an entry for the matched part
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*/
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if ( (eMatched = dn2entry_r( be, matched, &submatch )) != NULL) {
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char *remainder; /* part before the aliased part */
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int rlen = strlen(newDN) - strlen(matched);
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Debug( LDAP_DEBUG_TRACE, "<= matched %s\n", matched, 0, 0 );
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remainder = ch_malloc (rlen + 1);
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strncpy ( remainder, newDN, rlen );
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remainder[rlen] = '\0';
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Debug( LDAP_DEBUG_TRACE, "<= remainder %s\n", remainder, 0, 0 );
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if ((eNew = derefAlias_r( be, conn, op, eMatched )) == NULL) {
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free (matched);
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matched = NULL;
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free (newDN);
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newDN = NULL;
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free (remainder);
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remainder = NULL;
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cache_return_entry_r(&li->li_cache, eMatched);
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eMatched = NULL;
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break; /* no associated entry, dont deref */
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}
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else {
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Debug( LDAP_DEBUG_TRACE, "<= l&g we have %s vs %s \n", matched, eNew->e_dn, 0 );
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i = strcasecmp (matched, eNew->e_dn);
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/* free reader lock */
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cache_return_entry_r(&li->li_cache, eNew);
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free (matched);
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matched = NULL;
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if (! i) {
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/* newDN same as old so not an alias, no need to go further */
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free (newDN);
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newDN = NULL;
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free (remainder);
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cache_return_entry_r(&li->li_cache, eMatched);
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eMatched = NULL;
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break;
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}
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/*
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* we have dereferenced the aliased part so put
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* the new dn together
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*/
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free (newDN);
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newDN = ch_malloc (strlen(eMatched->e_dn) + rlen + 1);
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strcpy (newDN, remainder);
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strcat (newDN, eMatched->e_dn);
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Debug( LDAP_DEBUG_TRACE, "<= expanded to %s\n", newDN, 0, 0 );
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free (remainder);
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}
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/* free reader lock */
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cache_return_entry_r(&li->li_cache, eMatched);
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}
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else {
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if(submatch != NULL) free(submatch);
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break; /* there was no entry for the matched part */
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}
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}
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else {
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break; /* there was no matched part */
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}
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}
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/* release lock if a match terminated the loop, there should be no
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* outstanding locks at this point
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*/
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if(eMatched != NULL) {
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/* free reader lock */
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cache_return_entry_r(&li->li_cache, eMatched);
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}
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/*
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* the final part of the DN might be an alias so try to dereference it.
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* e.g. if we had started with dn = o=MyAliasedOrg,c=MyCountry the dn would match
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* and the above loop complete but we would still be left with an aliased DN.
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*/
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if (newDN != NULL) {
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if ( (eNew = dn2entry_r( be, newDN, &matched )) != NULL) {
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if ((eDeref = derefAlias_r( be, conn, op, eNew )) != NULL) {
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free (newDN);
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newDN = ch_strdup (eDeref->e_dn);
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/* free reader lock */
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cache_return_entry_r(&li->li_cache, eDeref);
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}
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/* free reader lock */
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cache_return_entry_r(&li->li_cache, eNew);
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}
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}
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if (matched != NULL) free(matched);
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/*
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* warn if we exceeded the max depth as the resulting DN may not be dereferenced
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*/
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if (depth >= be->be_maxDerefDepth) {
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if (newDN) {
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Debug( LDAP_DEBUG_TRACE,
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"<= max deref depth exceeded in derefDN for \"%s\", result \"%s\"\n",
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dn, newDN, 0 );
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free (newDN);
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newDN = NULL;
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}
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else {
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Debug( LDAP_DEBUG_TRACE,
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"<= max deref depth exceeded in derefDN for \"%s\", result NULL\n",
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dn, 0, 0 );
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}
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send_ldap_result( conn, op, LDAP_ALIAS_DEREF_PROBLEM, "",
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"Maximum alias dereference depth exceeded for base" );
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}
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if (newDN == NULL) {
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newDN = ch_strdup ( dn );
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}
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Debug( LDAP_DEBUG_TRACE, "<= returning deref DN of \"%s\"\n", newDN, 0, 0 );
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return newDN;
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}
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