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/** BEGIN COPYRIGHT BLOCK
* This Program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; version 2 of the License.
*
* This Program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this Program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA.
*
* In addition, as a special exception, Red Hat, Inc. gives You the additional
* right to link the code of this Program with code not covered under the GNU
* General Public License ("Non-GPL Code") and to distribute linked combinations
* including the two, subject to the limitations in this paragraph. Non-GPL Code
* permitted under this exception must only link to the code of this Program
* through those well defined interfaces identified in the file named EXCEPTION
* found in the source code files (the "Approved Interfaces"). The files of
* Non-GPL Code may instantiate templates or use macros or inline functions from
* the Approved Interfaces without causing the resulting work to be covered by
* the GNU General Public License. Only Red Hat, Inc. may make changes or
* additions to the list of Approved Interfaces. You must obey the GNU General
* Public License in all respects for all of the Program code and other code used
* in conjunction with the Program except the Non-GPL Code covered by this
* exception. If you modify this file, you may extend this exception to your
* version of the file, but you are not obligated to do so. If you do not wish to
* provide this exception without modification, you must delete this exception
* statement from your version and license this file solely under the GPL without
* exception.
*
*
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2010 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "slap.h"
#define BEGIN do {
#define END } while(0);
/* ------------------------------------------------------------
* LDAPProxyAuth
*
* ProxyAuthControl ::= SEQUENCE {
* authorizationDN LDAPDN
* }
*/
struct LDAPProxyAuth
{
char *auth_dn;
};
typedef struct LDAPProxyAuth LDAPProxyAuth;
/*
* delete_LDAPProxyAuth
*/
static void
delete_LDAPProxyAuth(LDAPProxyAuth *spec)
{
if (!spec) return;
slapi_ch_free((void**)&spec->auth_dn);
slapi_ch_free((void**)&spec);
}
/*
* parse_LDAPProxyAuth
*
* Parse a BER encoded value into the compoents of the LDAP ProxyAuth control.
* The 'version' parameter should be 1 or 2.
*
* Returns an LDAP error code (LDAP_SUCCESS if all goes well) and sets
* *errtextp if appropriate.
*/
static int
parse_LDAPProxyAuth(struct berval *spec_ber, int version, char **errtextp,
LDAPProxyAuth **out)
{
int lderr = LDAP_OPERATIONS_ERROR; /* pessimistic */
LDAPProxyAuth *spec = NULL;
BerElement *ber = NULL;
char *errstring = "unable to parse proxied authorization control";
int rc = 0;
char *normed = NULL;
size_t dnlen = 0;
BEGIN
ber_tag_t tag;
if ( version != 1 && version != 2 ) {
break;
}
if ( !spec_ber || !spec_ber->bv_val ) {
break;
}
/* create_LDAPProxyAuth */
spec = (LDAPProxyAuth*)slapi_ch_calloc(1,sizeof (LDAPProxyAuth));
if (!spec) {
break;
}
ber = ber_init(spec_ber);
if (!ber) {
break;
}
if ( version == 1 ) {
tag = ber_scanf(ber, "{a}", &spec->auth_dn);
} else {
tag = ber_scanf(ber, "a", &spec->auth_dn);
}
if (tag == LBER_ERROR) {
lderr = LDAP_PROTOCOL_ERROR;
break;
}
/*
* In version 2 of the control, the control value is actually an
* authorization ID (see section 9 of RFC 2829). We only support
* the "dnAuthzId" flavor, which looks like "dn:<DN>" where <DN> is
* an actual DN, e.g., "dn:uid=bjensen,dc=example,dc=com". So we
* need to strip off the dn: if present and reject the operation if
* not.
*/
if (2 == version) {
if ( NULL == spec->auth_dn || strlen( spec->auth_dn ) < 3 ||
strncmp( "dn:", spec->auth_dn, 3 ) != 0 ) {
lderr = LDAP_INSUFFICIENT_ACCESS; /* per Proxied Auth. I-D */
errstring = "proxied authorization id must be a DN (dn:...)";
break;
}
/* memmove is safe for overlapping copy */
memmove ( spec->auth_dn, spec->auth_dn + 3, strlen(spec->auth_dn) - 2);/* 1 for '\0' */
}
lderr = LDAP_SUCCESS; /* got it! */
rc = slapi_dn_normalize_ext(spec->auth_dn, 0, &normed, &dnlen);
if (rc < 0) {
lderr = LDAP_INVALID_SYNTAX;
} else if (rc == 0) { /* spec->auth_dn is passed in; not terminated */
*(normed + dnlen) = '\0';
} else {
slapi_ch_free_string(&spec->auth_dn);
spec->auth_dn = normed;
}
END
/* Cleanup */
if (ber) ber_free(ber, 0);
if ( LDAP_SUCCESS != lderr)
{
if (spec) delete_LDAPProxyAuth(spec);
spec = 0;
if ( NULL != errtextp ) {
*errtextp = errstring;
}
}
*out = spec;
return lderr;
}
/*
* proxyauth_dn - find the users DN in the proxyauth control if it is
* present. The return value has been malloced for you.
*
* Returns an LDAP error code. If anything than LDAP_SUCCESS is returned,
* the error should be returned to the client. LDAP_SUCCESS is always
* returned if the proxy auth control is not present or not critical.
*/
int
proxyauth_get_dn( Slapi_PBlock *pb, char **proxydnp, char **errtextp )
{
char *dn = 0;
LDAPProxyAuth *spec = 0;
int rv, lderr = LDAP_SUCCESS; /* optimistic */
BEGIN
struct berval *spec_ber;
LDAPControl **controls;
int present;
int critical;
int version = 1;
rv = slapi_pblock_get( pb, SLAPI_REQCONTROLS, &controls );
if (rv) break;
present = slapi_control_present( controls, LDAP_CONTROL_PROXYAUTH,
&spec_ber, &critical );
if (!present) {
present = slapi_control_present( controls, LDAP_CONTROL_PROXIEDAUTH,
&spec_ber, &critical );
if (!present) break;
version = 2;
/*
* Note the according to the Proxied Authorization I-D, the
* control is always supposed to be marked critical by the
* client. If it is not, we return a protocolError.
*/
if ( !critical ) {
lderr = LDAP_PROTOCOL_ERROR;
if ( NULL != errtextp ) {
*errtextp = "proxy control must be marked critical";
}
break;
}
}
rv = parse_LDAPProxyAuth(spec_ber, version, errtextp, &spec);
if (LDAP_SUCCESS != rv) {
if ( critical ) {
lderr = rv;
}
break;
}
dn = slapi_ch_strdup(spec->auth_dn);
if (slapi_dn_isroot(dn) ) {
lderr = LDAP_UNWILLING_TO_PERFORM;
*errtextp = "Proxy dn should not be rootdn";
break;
}
END
if (spec) delete_LDAPProxyAuth(spec);
if ( NULL != proxydnp ) {
*proxydnp = dn;
} else {
slapi_ch_free( (void **)&dn );
}
return lderr;
}
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