mirror of
https://git.openldap.org/openldap/openldap.git
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243 lines
6.4 KiB
C
243 lines
6.4 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 <string.h>
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#include <ac/socket.h> /* Get struct sockaddr for slap.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
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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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Attribute *a;
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int depth;
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char **pastAliases;
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char *matched;
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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_dn);
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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_PROBLEM, "",
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"Dangling Alias" );
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if(matched != NULL) free(matched);
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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_dn, 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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}
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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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"<= %s exceeded maximum deref depth %d\n",
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e->e_dn, be->be_maxDerefDepth, 0 );
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send_ldap_result( conn, op, LDAP_ALIAS_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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*/
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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;
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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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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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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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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 (matched);
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matched = NULL;
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free (remainder);
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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 (matched);
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matched = NULL;
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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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/* free reader lock */
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cache_return_entry_r(&li->li_cache, eMatched);
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/*
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* the final part of the DN might be an alias
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* so try to dereference it.
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*/
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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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* 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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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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send_ldap_result( conn, op, LDAP_ALIAS_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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if (matched != NULL) free(matched);
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return newDN;
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}
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