openldap/contrib/slapd-modules/vc/vc.c
Quanah Gibson-Mount 59e9ff6243 Happy New Year
2018-03-22 15:35:24 +00:00

442 lines
9.8 KiB
C

/* vc.c - LDAP Verify Credentials extop (no spec yet) */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2010-2018 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* ACKNOWLEDGEMENTS:
* This work was initially developed by Pierangelo Masarati for inclusion
* in OpenLDAP Software.
*/
/*
* LDAP Verify Credentials: suggested by Kurt Zeilenga
* no spec yet
*/
#include "portable.h"
#include "slap.h"
#include "ac/string.h"
typedef struct vc_conn_t {
struct vc_conn_t *conn;
Connection connbuf;
OperationBuffer opbuf;
Operation *op;
int refcnt;
} vc_conn_t;
static const struct berval vc_exop_oid_bv = BER_BVC(LDAP_EXOP_VERIFY_CREDENTIALS);
static ldap_pvt_thread_mutex_t vc_mutex;
static Avlnode *vc_tree;
static int
vc_conn_cmp( const void *c1, const void *c2 )
{
const vc_conn_t *vc1 = (const vc_conn_t *)c1;
const vc_conn_t *vc2 = (const vc_conn_t *)c2;
return SLAP_PTRCMP( vc1->conn, vc2->conn );
}
static int
vc_conn_dup( void *c1, void *c2 )
{
vc_conn_t *vc1 = (vc_conn_t *)c1;
vc_conn_t *vc2 = (vc_conn_t *)c2;
if ( vc1->conn == vc2->conn ) {
return -1;
}
return 0;
}
static int
vc_create_response(
void *conn,
int resultCode,
const char *diagnosticMessage,
struct berval *servercred,
struct berval *authzid,
LDAPControl **ctrls,
struct berval **val )
{
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
struct berval bv;
int rc;
assert( val != NULL );
*val = NULL;
ber_init2( ber, NULL, LBER_USE_DER );
(void)ber_printf( ber, "{is" /*}*/ , resultCode, diagnosticMessage ? diagnosticMessage : "" );
if ( conn ) {
struct berval cookie;
cookie.bv_len = sizeof( conn );
cookie.bv_val = (char *)&conn;
(void)ber_printf( ber, "tO", 0, LDAP_TAG_EXOP_VERIFY_CREDENTIALS_COOKIE, &cookie );
}
if ( servercred ) {
ber_printf( ber, "tO", LDAP_TAG_EXOP_VERIFY_CREDENTIALS_SCREDS, servercred );
}
#if 0
if ( authzid ) {
ber_printf( ber, "tO", LDAP_TAG_EXOP_VERIFY_CREDENTIALS_AUTHZID, authzid );
}
#endif
if ( ctrls ) {
int c;
rc = ber_printf( ber, "t{"/*}*/, LDAP_TAG_EXOP_VERIFY_CREDENTIALS_CONTROLS );
if ( rc == -1 ) goto done;
for ( c = 0; ctrls[c] != NULL; c++ ) {
rc = ber_printf( ber, "{s" /*}*/, ctrls[c]->ldctl_oid );
if ( ctrls[c]->ldctl_iscritical ) {
rc = ber_printf( ber, "b", (ber_int_t)ctrls[c]->ldctl_iscritical ) ;
if ( rc == -1 ) goto done;
}
if ( ctrls[c]->ldctl_value.bv_val != NULL ) {
rc = ber_printf( ber, "O", &ctrls[c]->ldctl_value );
if( rc == -1 ) goto done;
}
rc = ber_printf( ber, /*{*/"N}" );
if ( rc == -1 ) goto done;
}
rc = ber_printf( ber, /*{*/"N}" );
if ( rc == -1 ) goto done;
}
rc = ber_printf( ber, /*{*/ "}" );
if ( rc == -1 ) goto done;
rc = ber_flatten2( ber, &bv, 0 );
if ( rc == 0 ) {
*val = ber_bvdup( &bv );
}
done:;
ber_free_buf( ber );
return rc;
}
typedef struct vc_cb_t {
struct berval sasldata;
LDAPControl **ctrls;
} vc_cb_t;
static int
vc_cb(
Operation *op,
SlapReply *rs )
{
vc_cb_t *vc = (vc_cb_t *)op->o_callback->sc_private;
if ( rs->sr_tag == LDAP_RES_BIND ) {
if ( rs->sr_sasldata != NULL ) {
ber_dupbv( &vc->sasldata, rs->sr_sasldata );
}
if ( rs->sr_ctrls != NULL ) {
vc->ctrls = ldap_controls_dup( rs->sr_ctrls );
}
}
return 0;
}
static int
vc_exop(
Operation *op,
SlapReply *rs )
{
int rc = LDAP_SUCCESS;
ber_tag_t tag;
ber_len_t len = -1;
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
struct berval reqdata = BER_BVNULL;
struct berval cookie = BER_BVNULL;
struct berval bdn = BER_BVNULL;
ber_tag_t authtag;
struct berval cred = BER_BVNULL;
struct berval ndn = BER_BVNULL;
struct berval mechanism = BER_BVNULL;
vc_conn_t *conn = NULL;
vc_cb_t vc = { 0 };
slap_callback sc = { 0 };
SlapReply rs2 = { 0 };
if ( op->ore_reqdata == NULL || op->ore_reqdata->bv_len == 0 ) {
rs->sr_text = "empty request data field in VerifyCredentials exop";
return LDAP_PROTOCOL_ERROR;
}
/* optimistic */
rs->sr_err = LDAP_SUCCESS;
ber_dupbv_x( &reqdata, op->ore_reqdata, op->o_tmpmemctx );
/* ber_init2 uses reqdata directly, doesn't allocate new buffers */
ber_init2( ber, &reqdata, 0 );
tag = ber_scanf( ber, "{" /*}*/ );
if ( tag != LBER_SEQUENCE ) {
rs->sr_err = LDAP_PROTOCOL_ERROR;
goto done;
}
tag = ber_peek_tag( ber, &len );
if ( tag == LDAP_TAG_EXOP_VERIFY_CREDENTIALS_COOKIE ) {
/*
* cookie: the pointer to the connection
* of this operation
*/
ber_scanf( ber, "m", &cookie );
if ( cookie.bv_len != sizeof(Connection *) ) {
rs->sr_err = LDAP_PROTOCOL_ERROR;
goto done;
}
}
/* DN, authtag */
tag = ber_scanf( ber, "mt", &bdn, &authtag );
if ( tag == LBER_ERROR ) {
rs->sr_err = LDAP_PROTOCOL_ERROR;
goto done;
}
rc = dnNormalize( 0, NULL, NULL, &bdn, &ndn, op->o_tmpmemctx );
if ( rc != LDAP_SUCCESS ) {
rs->sr_err = LDAP_PROTOCOL_ERROR;
goto done;
}
switch ( authtag ) {
case LDAP_AUTH_SIMPLE:
/* cookie only makes sense for SASL bind (so far) */
if ( !BER_BVISNULL( &cookie ) ) {
rs->sr_err = LDAP_PROTOCOL_ERROR;
goto done;
}
tag = ber_scanf( ber, "m", &cred );
if ( tag == LBER_ERROR ) {
rs->sr_err = LDAP_PROTOCOL_ERROR;
goto done;
}
break;
case LDAP_AUTH_SASL:
tag = ber_scanf( ber, "{m" /*}*/ , &mechanism );
if ( tag == LBER_ERROR ||
BER_BVISNULL( &mechanism ) || BER_BVISEMPTY( &mechanism ) )
{
rs->sr_err = LDAP_PROTOCOL_ERROR;
goto done;
}
tag = ber_peek_tag( ber, &len );
if ( tag == LBER_OCTETSTRING ) {
ber_scanf( ber, "m", &cred );
}
tag = ber_scanf( ber, /*{*/ "}" );
break;
default:
rs->sr_err = LDAP_PROTOCOL_ERROR;
goto done;
}
if ( !BER_BVISNULL( &cookie ) ) {
vc_conn_t tmp = { 0 };
AC_MEMCPY( (char *)&tmp.conn, (const char *)cookie.bv_val, cookie.bv_len );
ldap_pvt_thread_mutex_lock( &vc_mutex );
conn = (vc_conn_t *)avl_find( vc_tree, (caddr_t)&tmp, vc_conn_cmp );
if ( conn == NULL || ( conn != NULL && conn->refcnt != 0 ) ) {
conn = NULL;
ldap_pvt_thread_mutex_unlock( &vc_mutex );
rs->sr_err = LDAP_PROTOCOL_ERROR;
goto done;
}
conn->refcnt++;
ldap_pvt_thread_mutex_unlock( &vc_mutex );
} else {
void *thrctx;
conn = (vc_conn_t *)SLAP_CALLOC( 1, sizeof( vc_conn_t ) );
conn->refcnt = 1;
thrctx = ldap_pvt_thread_pool_context();
connection_fake_init2( &conn->connbuf, &conn->opbuf, thrctx, 0 );
conn->op = &conn->opbuf.ob_op;
snprintf( conn->op->o_log_prefix, sizeof( conn->op->o_log_prefix ),
"%s VERIFYCREDENTIALS", op->o_log_prefix );
}
conn->op->o_tag = LDAP_REQ_BIND;
memset( &conn->op->oq_bind, 0, sizeof( conn->op->oq_bind ) );
conn->op->o_req_dn = ndn;
conn->op->o_req_ndn = ndn;
conn->op->o_protocol = LDAP_VERSION3;
conn->op->orb_method = authtag;
conn->op->o_callback = &sc;
/* TODO: controls */
tag = ber_peek_tag( ber, &len );
if ( tag == LDAP_TAG_EXOP_VERIFY_CREDENTIALS_CONTROLS ) {
conn->op->o_ber = ber;
rc = get_ctrls2( conn->op, &rs2, 0, LDAP_TAG_EXOP_VERIFY_CREDENTIALS_CONTROLS );
if ( rc != LDAP_SUCCESS ) {
rs->sr_err = LDAP_PROTOCOL_ERROR;
goto done;
}
}
tag = ber_skip_tag( ber, &len );
if ( len || tag != LBER_DEFAULT ) {
rs->sr_err = LDAP_PROTOCOL_ERROR;
goto done;
}
switch ( authtag ) {
case LDAP_AUTH_SIMPLE:
break;
case LDAP_AUTH_SASL:
conn->op->orb_mech = mechanism;
break;
}
conn->op->orb_cred = cred;
sc.sc_response = vc_cb;
sc.sc_private = &vc;
conn->op->o_bd = frontendDB;
rs->sr_err = frontendDB->be_bind( conn->op, &rs2 );
if ( conn->op->o_conn->c_sasl_bind_in_progress ) {
rc = vc_create_response( conn, rs2.sr_err, rs2.sr_text,
!BER_BVISEMPTY( &vc.sasldata ) ? &vc.sasldata : NULL,
NULL,
vc.ctrls, &rs->sr_rspdata );
} else {
rc = vc_create_response( NULL, rs2.sr_err, rs2.sr_text,
NULL,
&conn->op->o_conn->c_dn,
vc.ctrls, &rs->sr_rspdata );
}
if ( rc != 0 ) {
rs->sr_err = LDAP_OTHER;
goto done;
}
if ( !BER_BVISNULL( &conn->op->o_conn->c_dn ) &&
conn->op->o_conn->c_dn.bv_val != conn->op->o_conn->c_ndn.bv_val )
ber_memfree( conn->op->o_conn->c_dn.bv_val );
if ( !BER_BVISNULL( &conn->op->o_conn->c_ndn ) )
ber_memfree( conn->op->o_conn->c_ndn.bv_val );
done:;
if ( conn ) {
if ( conn->op->o_conn->c_sasl_bind_in_progress ) {
if ( conn->conn == NULL ) {
conn->conn = conn;
conn->refcnt--;
ldap_pvt_thread_mutex_lock( &vc_mutex );
rc = avl_insert( &vc_tree, (caddr_t)conn,
vc_conn_cmp, vc_conn_dup );
ldap_pvt_thread_mutex_unlock( &vc_mutex );
assert( rc == 0 );
} else {
ldap_pvt_thread_mutex_lock( &vc_mutex );
conn->refcnt--;
ldap_pvt_thread_mutex_unlock( &vc_mutex );
}
} else {
if ( conn->conn != NULL ) {
vc_conn_t *tmp;
ldap_pvt_thread_mutex_lock( &vc_mutex );
tmp = avl_delete( &vc_tree, (caddr_t)conn, vc_conn_cmp );
ldap_pvt_thread_mutex_unlock( &vc_mutex );
}
SLAP_FREE( conn );
}
}
if ( vc.ctrls ) {
ldap_controls_free( vc.ctrls );
vc.ctrls = NULL;
}
if ( !BER_BVISNULL( &ndn ) ) {
op->o_tmpfree( ndn.bv_val, op->o_tmpmemctx );
BER_BVZERO( &ndn );
}
op->o_tmpfree( reqdata.bv_val, op->o_tmpmemctx );
BER_BVZERO( &reqdata );
return rs->sr_err;
}
static int
vc_initialize( void )
{
int rc;
rc = load_extop2( (struct berval *)&vc_exop_oid_bv,
SLAP_EXOP_HIDE, vc_exop, 0 );
if ( rc != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_ANY,
"vc_initialize: unable to register VerifyCredentials exop: %d.\n",
rc, 0, 0 );
}
ldap_pvt_thread_mutex_init( &vc_mutex );
return rc;
}
int
init_module( int argc, char *argv[] )
{
return vc_initialize();
}