openldap/servers/slapd/controls.c

/* $OpenLDAP$ */
/* 
 * Copyright 1999 The OpenLDAP Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted only
 * as authorized by the OpenLDAP Public License.  A copy of this
 * license is available at http://www.OpenLDAP.org/license.html or
 * in file LICENSE in the top-level directory of the distribution.
 */
#include "portable.h"

#include <stdio.h>

#include <ac/string.h>
#include <ac/socket.h>

#include "slap.h"

#include "../../libraries/liblber/lber-int.h"

char *supportedControls[] = {
	LDAP_CONTROL_MANAGEDSAIT,
	LDAP_CONTROL_X_CHANGE_PASSWD,
	NULL
};

int get_ctrls(
	Connection *conn,
	Operation *op,
	int sendres )
{
	int nctrls = 0;
	ber_tag_t tag;
	ber_len_t len;
	char *opaque;
	BerElement *ber = op->o_ber;
	LDAPControl ***ctrls = &op->o_ctrls;
	int rc = LDAP_SUCCESS;
	char *errmsg = NULL;

	len = ber_pvt_ber_remaining(ber);

	if( len == 0) {
		/* no controls */
		rc = LDAP_SUCCESS;
		return rc;
	}

	if(( tag = ber_peek_tag( ber, &len )) != LDAP_TAG_CONTROLS ) {
		if( tag == LBER_ERROR ) {
			rc = -1;
			errmsg = "unexpected data in PDU";
		}

		goto return_results;
	}

	Debug( LDAP_DEBUG_TRACE, "=> get_ctrls\n", 0, 0, 0 );

	if( op->o_protocol < LDAP_VERSION3 ) {
		rc = -1;
		errmsg = "controls require LDAPv3";
		goto return_results;
	}

	/* set through each element */
	*ctrls = ch_malloc( 1 * sizeof(LDAPControl *) );

#if 0
	if( *ctrls == NULL ) {
		rc = LDAP_NO_MEMORY;
		errmsg = "no memory";
		goto return_results;
	}
#endif

	*ctrls[nctrls] = NULL;

	for( tag = ber_first_element( ber, &len, &opaque );
		tag != LBER_ERROR;
		tag = ber_next_element( ber, &len, opaque ) )
	{
		LDAPControl *tctrl;
		LDAPControl **tctrls;

		tctrl = ch_calloc( 1, sizeof(LDAPControl) );
		tctrl->ldctl_oid = NULL;
		tctrl->ldctl_value.bv_val = NULL;

		/* allocate pointer space for current controls (nctrls)
		 * + this control + extra NULL
		 */
		tctrls = (tctrl == NULL) ? NULL :
			ch_realloc(*ctrls, (nctrls+2) * sizeof(LDAPControl *));

#if 0
		if( tctrls == NULL ) {
			/* one of the above allocation failed */

			if( tctrl != NULL ) {
				ch_free( tctrl );
			}

			ldap_controls_free(*ctrls);
			*ctrls = NULL;

			rc = LDAP_NO_MEMORY;
			errmsg = "no memory";
			goto return_results;
		}
#endif

		tctrls[nctrls++] = tctrl;
		tctrls[nctrls] = NULL;

		tag = ber_scanf( ber, "{a" /*}*/, &tctrl->ldctl_oid );

		if( tag == LBER_ERROR ) {
			Debug( LDAP_DEBUG_TRACE, "=> get_ctrls: get oid failed.\n",
				0, 0, 0 );
			*ctrls = NULL;
			ldap_controls_free( tctrls );
			rc = -1;
			errmsg = "decoding controls error";
			goto return_results;
		}

		tag = ber_peek_tag( ber, &len );

		if( tag == LBER_BOOLEAN ) {
			ber_int_t crit;
			tag = ber_scanf( ber, "b", &crit );

			if( tag == LBER_ERROR ) {
				Debug( LDAP_DEBUG_TRACE, "=> get_ctrls: get crit failed.\n",
					0, 0, 0 );
				*ctrls = NULL;
				ldap_controls_free( tctrls );
				rc = -1;
				errmsg = "decoding controls error";
				goto return_results;
			}

			tctrl->ldctl_iscritical = (crit != 0);
			tag = ber_peek_tag( ber, &len );
		}

		Debug( LDAP_DEBUG_TRACE, "=> get_ctrls: oid=\"%s\" (%scritical)\n",
			tctrl->ldctl_oid, 
			tctrl->ldctl_iscritical ? "" : "non",
			0 );

		if( tag == LBER_OCTETSTRING ) {
			tag = ber_scanf( ber, "o", &tctrl->ldctl_value );

			if( tag == LBER_ERROR ) {
				Debug( LDAP_DEBUG_TRACE, "=> get_ctrls: get value failed.\n",
					0, 0, 0 );
				*ctrls = NULL;
				ldap_controls_free( tctrls );
				rc = -1;
				errmsg = "decoding controls error";
				goto return_results;
			}
		}

		if( tctrl->ldctl_iscritical &&
			!charray_inlist( supportedControls, tctrl->ldctl_oid ) )
		{
			rc = LDAP_UNAVAILABLE_CRITICAL_EXTENSION;
			errmsg = "critical extension is unavailable ";
			goto return_results;
		}

		*ctrls = tctrls;
	}

return_results:
	Debug( LDAP_DEBUG_TRACE, "<= get_ctrls: %d %d %s\n",
		nctrls, rc, errmsg ? errmsg : "");

	if( sendres && rc != LDAP_SUCCESS ) {
		if( rc == -1 ) {
			send_ldap_disconnect( conn, op, rc, errmsg );
		} else {
			send_ldap_result( conn, op, rc,
				NULL, errmsg, NULL, NULL );
		}
	}

	return rc;
}


int get_manageDSAit( Operation *op )
{
	int i;
	if( op == NULL || op->o_ctrls == NULL ) {
		return 0;
	}

	for( i=0; op->o_ctrls[i] != NULL; i++ ) {
		if( strcmp( LDAP_CONTROL_MANAGEDSAIT, op->o_ctrls[i]->ldctl_oid )
			== 0 )
		{
			return 1;
		}
	}

	return 0;
}