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/** BEGIN COPYRIGHT BLOCK
* Copyright 2001 Sun Microsystems, Inc.
* Portions copyright 1999, 2001-2003 Netscape Communications Corporation.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#include "cb.h"
/*
** Controls that can't be forwarded due to the current implementation
*/
static char * unsupported_ctrls[] = {LDAP_CONTROL_PERSISTENTSEARCH,NULL};
int cb_is_control_forwardable(cb_backend * cb, char *controloid) {
return (!(charray_inlist(unsupported_ctrls,controloid)));
}
void
cb_register_supported_control( cb_backend * cb, char *controloid, unsigned long controlops )
{
/* For now, ignore controlops */
if ( controloid != NULL ) {
PR_RWLock_Wlock(cb->config.rwl_config_lock);
charray_add( &cb->config.forward_ctrls,slapi_ch_strdup( controloid ));
PR_RWLock_Unlock(cb->config.rwl_config_lock);
}
}
void
cb_unregister_all_supported_control( cb_backend * cb ) {
PR_RWLock_Wlock(cb->config.rwl_config_lock);
charray_free(cb->config.forward_ctrls);
cb->config.forward_ctrls=NULL;
PR_RWLock_Unlock(cb->config.rwl_config_lock);
}
void
cb_unregister_supported_control( cb_backend * cb, char *controloid, unsigned long controlops )
{
/* For now, ignore controlops */
if ( controloid != NULL ) {
int i;
PR_RWLock_Wlock(cb->config.rwl_config_lock);
for ( i = 0; cb->config.forward_ctrls != NULL && cb->config.forward_ctrls[i] != NULL; ++i ) {
if ( strcmp( cb->config.forward_ctrls[i], controloid ) == 0 ) {
break;
}
}
if ( cb->config.forward_ctrls == NULL || cb->config.forward_ctrls[i] == NULL) {
PR_RWLock_Unlock(cb->config.rwl_config_lock);
return;
}
if ( controlops == 0 ) {
charray_remove(cb->config.forward_ctrls,controloid);
}
PR_RWLock_Unlock(cb->config.rwl_config_lock);
}
}
int cb_create_loop_control (
const int hops,
LDAPControl **ctrlp)
{
BerElement *ber;
int rc;
if ((ber = ber_alloc()) == NULL)
return -1;
if ( ber_printf( ber, "i", hops ) < 0) {
ber_free(ber,1);
return -1;
}
rc = slapi_build_control( CB_LDAP_CONTROL_CHAIN_SERVER, ber, 0, ctrlp);
ber_free(ber,1);
return rc;
}
/*
** Return the controls to be passed to the remote
** farm server and the LDAP error to return.
**
** Add the Proxied Authorization control when impersonation
** is enabled. Other controls present in the request are added
** to the control list
**
** #622885 .abandon should not inherit the to-be-abandoned-operation's controls
** .controls attached to abandon should not be critical
*/
int cb_update_controls( Slapi_PBlock * pb,
LDAP * ld,
LDAPControl *** controls,
int ctrl_flags
)
{
int cCount=0;
int dCount=0;
int i;
char * proxyDN=NULL;
LDAPControl ** reqControls = NULL;
LDAPControl ** ctrls = NULL;
cb_backend_instance * cb;
cb_backend * cbb;
Slapi_Backend * be;
int rc=LDAP_SUCCESS;
int hops=0;
int useloop=0;
int addauth = (ctrl_flags & CB_UPDATE_CONTROLS_ADDAUTH);
int isabandon = (ctrl_flags & CB_UPDATE_CONTROLS_ISABANDON);
int op_type = 0;
*controls = NULL;
slapi_pblock_get(pb, SLAPI_OPERATION_TYPE, &op_type);
if (!isabandon || op_type == SLAPI_OPERATION_ABANDON) {
/* if not abandon or abandon sent by client */
slapi_pblock_get( pb, SLAPI_REQCONTROLS, &reqControls );
}
slapi_pblock_get( pb, SLAPI_BACKEND, &be );
slapi_pblock_get( pb, SLAPI_PLUGIN_PRIVATE, &cbb );
cb = cb_get_instance(be);
/*****************************************/
/* First, check for unsupported controls */
/* Return an error if critical control */
/* else remove it from the control list */
/*****************************************/
for ( cCount=0; reqControls && reqControls[cCount]; cCount++ );
ctrls = (LDAPControl **)slapi_ch_calloc(1,sizeof(LDAPControl *) * (cCount +3));
PR_RWLock_Rlock(cbb->config.rwl_config_lock);
for ( cCount=0; reqControls && reqControls[cCount]; cCount++ ) {
/* XXXSD CASCADING */
/* For now, allow PROXY_AUTH control forwarding only when */
/* local acl evaluation to prevent unauthorized access */
if (!strcmp(reqControls[cCount]->ldctl_oid,LDAP_CONTROL_PROXYAUTH)) {
/* we have to force remote acl checking if the associated backend to this
chaining backend is disabled - disabled == no acl check possible */
if (!cb->local_acl && !cb->associated_be_is_disabled) {
slapi_log_error( SLAPI_LOG_PLUGIN,CB_PLUGIN_SUBSYSTEM,
"local aci check required to handle proxied auth control. Deny access.\n");
rc= LDAP_INSUFFICIENT_ACCESS;
break;
}
/* XXXSD Not safe to use proxied authorization with Directory Manager */
/* checked earlier when impersonation is on */
if (!cb->impersonate) {
char * requestor,*rootdn;
char * requestorCopy=NULL;
rootdn=cb_get_rootdn();
slapi_pblock_get( pb, SLAPI_REQUESTOR_DN, &requestor );
requestorCopy=slapi_ch_strdup(requestor);
slapi_dn_normalize_case(requestorCopy);
if (!strcmp( requestorCopy, rootdn )) { /* UTF8- aware */
slapi_log_error( SLAPI_LOG_PLUGIN,CB_PLUGIN_SUBSYSTEM,
"Use of user <%s> incompatible with proxied auth. control\n",rootdn);
rc=LDAP_UNAVAILABLE_CRITICAL_EXTENSION;
slapi_ch_free((void **)&requestorCopy);
break;
}
slapi_ch_free((void **)&rootdn);
slapi_ch_free((void **)&requestorCopy);
}
addauth=0;
ctrls[dCount]=slapi_dup_control(reqControls[cCount]);
dCount++;
} else
if (!strcmp(reqControls[cCount]->ldctl_oid,CB_LDAP_CONTROL_CHAIN_SERVER)) {
/* Max hop count reached ? */
/* Checked realier by a call to cb_forward_operation() */
BerElement *ber = NULL;
ber = ber_init(&(reqControls[cCount]->ldctl_value));
ber_scanf(ber,"i",&hops);
ber_free(ber,1);
useloop=1;
/* Add to the control list later */
} else {
int i;
for ( i = 0; cbb->config.forward_ctrls != NULL
&& cbb->config.forward_ctrls[i] != NULL; ++i ) {
if ( strcmp( cbb->config.forward_ctrls[i], reqControls[cCount]->ldctl_oid ) == 0 ) {
break;
}
}
/* For now, ignore optype */
if ( cbb->config.forward_ctrls == NULL || cbb->config.forward_ctrls[i] == NULL) {
if (reqControls[cCount]->ldctl_iscritical) {
rc = LDAP_UNAVAILABLE_CRITICAL_EXTENSION;
break;
}
/* Skip it */
} else {
ctrls[dCount]=slapi_dup_control(reqControls[cCount]);
dCount++;
}
}
}
PR_RWLock_Unlock(cbb->config.rwl_config_lock);
if (LDAP_SUCCESS != rc) {
ldap_controls_free(ctrls);
return rc;
}
/***************************************/
/* add impersonation control if needed */
/***************************************/
if ( !(cb->impersonate) ) {
/* don't add proxy control */
addauth=0;
}
if (addauth) {
slapi_pblock_get( pb, SLAPI_REQUESTOR_DN, &proxyDN );
if ( ldap_create_proxyauth_control(ld, proxyDN, isabandon?0:1, &ctrls[dCount] )) {
ldap_controls_free(ctrls);
slapi_log_error( SLAPI_LOG_PLUGIN, CB_PLUGIN_SUBSYSTEM,
"LDAP_CONTROL_PROXYAUTH control encoding failed.\n");
return LDAP_OPERATIONS_ERROR;
}
dCount++;
}
/***********************************************************/
/* add loop control if needed */
/* Don't add it if not in the list of forwardable controls */
/***********************************************************/
if (!useloop) {
for ( i = 0; cbb->config.forward_ctrls != NULL
&& cbb->config.forward_ctrls[i] != NULL; ++i ) {
if ( strcmp( cbb->config.forward_ctrls[i],
CB_LDAP_CONTROL_CHAIN_SERVER) == 0 ) {
break;
}
}
}
if ( useloop || (cbb->config.forward_ctrls !=NULL && cbb->config.forward_ctrls[i] !=NULL)){
if (hops > 0) {
hops--;
} else {
hops = cb->hoplimit;
}
/* loop control's critical flag is 0;
* no special treatment is needed for abandon */
cb_create_loop_control(hops,&ctrls[dCount]);
dCount++;
}
if (dCount==0) {
ldap_controls_free(ctrls);
} else {
*controls = ctrls;
}
return LDAP_SUCCESS;
}
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