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openldap/libraries/libldap/tls.c
Howard Chu d9a43aee44 Fix GNUtls acknowledgement, initial work by Matt Backes. Sponsored by 
The Written Word and Stanford University.
2007-05-14 23:35:36 +00:00

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/* tls.c - Handle tls/ssl using SSLeay, OpenSSL or GNUTLS. */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2007 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: GNUTLS support written by Howard Chu and
* Matt Backes; sponsored by The Written Word (thewrittenword.com)
* and Stanford University (stanford.edu).
*/
#include "portable.h"
#include "ldap_config.h"
#include <stdio.h>
#include <ac/stdlib.h>
#include <ac/errno.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/ctype.h>
#include <ac/time.h>
#include <ac/unistd.h>
#include <ac/param.h>
#include <ac/dirent.h>
#include "ldap-int.h"
#ifdef HAVE_TLS
#ifdef LDAP_R_COMPILE
#include <ldap_pvt_thread.h>
#endif
#ifdef HAVE_GNUTLS
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <gcrypt.h>
#define DH_BITS (1024)
#else
#ifdef HAVE_OPENSSL_SSL_H
#include <openssl/ssl.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/safestack.h>
#elif defined( HAVE_SSL_H )
#include <ssl.h>
#endif
#endif
#define HAS_TLS( sb ) ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO, \
(void *)&sb_tls_sbio )
/* RFC2459 minimum required set of supported attribute types
* in a certificate DN
*/
typedef struct oid_name {
struct berval oid;
struct berval name;
} oid_name;
#define CN_OID oids[0].oid.bv_val
static oid_name oids[] = {
{ BER_BVC("2.5.4.3"), BER_BVC("cn") },
{ BER_BVC("2.5.4.4"), BER_BVC("sn") },
{ BER_BVC("2.5.4.6"), BER_BVC("c") },
{ BER_BVC("2.5.4.7"), BER_BVC("l") },
{ BER_BVC("2.5.4.8"), BER_BVC("st") },
{ BER_BVC("2.5.4.10"), BER_BVC("o") },
{ BER_BVC("2.5.4.11"), BER_BVC("ou") },
{ BER_BVC("2.5.4.12"), BER_BVC("title") },
{ BER_BVC("2.5.4.41"), BER_BVC("name") },
{ BER_BVC("2.5.4.42"), BER_BVC("givenName") },
{ BER_BVC("2.5.4.43"), BER_BVC("initials") },
{ BER_BVC("2.5.4.44"), BER_BVC("generationQualifier") },
{ BER_BVC("2.5.4.46"), BER_BVC("dnQualifier") },
{ BER_BVC("1.2.840.113549.1.9.1"), BER_BVC("email") },
{ BER_BVC("0.9.2342.19200300.100.1.25"), BER_BVC("dc") },
{ BER_BVNULL, BER_BVNULL }
};
#ifdef HAVE_GNUTLS
typedef struct tls_cipher_suite {
const char *name;
gnutls_kx_algorithm_t kx;
gnutls_cipher_algorithm_t cipher;
gnutls_mac_algorithm_t mac;
gnutls_protocol_t version;
} tls_cipher_suite;
static tls_cipher_suite *ciphers;
static int n_ciphers;
/* sorta replacing SSL_CTX */
typedef struct tls_ctx {
struct ldapoptions *lo;
gnutls_certificate_credentials_t cred;
gnutls_dh_params_t dh_params;
unsigned long verify_depth;
int refcount;
int *kx_list;
int *cipher_list;
int *mac_list;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_t ref_mutex;
#endif
} tls_ctx;
/* sorta replacing SSL */
typedef struct tls_session {
tls_ctx *ctx;
gnutls_session_t session;
struct berval peer_der_dn;
} tls_session;
#ifdef LDAP_R_COMPILE
static int
ldap_pvt_gcry_mutex_init( void **priv )
{
int err = 0;
ldap_pvt_thread_mutex_t *lock = LDAP_MALLOC( sizeof( ldap_pvt_thread_mutex_t ));
if ( !lock )
err = ENOMEM;
if ( !err ) {
err = ldap_pvt_thread_mutex_init( lock );
if ( err )
LDAP_FREE( lock );
else
*priv = lock;
}
return err;
}
static int
ldap_pvt_gcry_mutex_destroy( void **lock )
{
int err = ldap_pvt_thread_mutex_destroy( *lock );
LDAP_FREE( *lock );
return err;
}
static int
ldap_pvt_gcry_mutex_lock( void **lock )
{
return ldap_pvt_thread_mutex_lock( *lock );
}
static int
ldap_pvt_gcry_mutex_unlock( void **lock )
{
return ldap_pvt_thread_mutex_unlock( *lock );
}
static struct gcry_thread_cbs ldap_generic_thread_cbs = {
GCRY_THREAD_OPTION_USER,
NULL,
ldap_pvt_gcry_mutex_init,
ldap_pvt_gcry_mutex_destroy,
ldap_pvt_gcry_mutex_lock,
ldap_pvt_gcry_mutex_unlock,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
static void
tls_init_threads( void )
{
gcry_control (GCRYCTL_SET_THREAD_CBS, &ldap_generic_thread_cbs);
}
#endif /* LDAP_R_COMPILE */
void
ldap_pvt_tls_ctx_free ( void *c )
{
int refcount;
tls_ctx *ctx = c;
if ( !ctx ) return;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &ctx->ref_mutex );
#endif
refcount = --ctx->refcount;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &ctx->ref_mutex );
#endif
if ( refcount )
return;
LDAP_FREE( ctx->kx_list );
gnutls_certificate_free_credentials( ctx->cred );
ber_memfree ( ctx );
}
static void *
tls_ctx_new ( struct ldapoptions *lo )
{
tls_ctx *ctx;
ctx = ber_memcalloc ( 1, sizeof (*ctx) );
if ( ctx ) {
ctx->lo = lo;
if ( gnutls_certificate_allocate_credentials( &ctx->cred )) {
ber_memfree( ctx );
return NULL;
}
ctx->refcount = 1;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_init( &ctx->ref_mutex );
#endif
}
return ctx;
}
static void
tls_ctx_ref( tls_ctx *ctx )
{
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &ctx->ref_mutex );
#endif
ctx->refcount++;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &ctx->ref_mutex );
#endif
}
tls_session *
tls_session_new ( tls_ctx * ctx, int is_server )
{
tls_session *session;
session = ber_memcalloc ( 1, sizeof (*session) );
if ( !session )
return NULL;
session->ctx = ctx;
gnutls_init( &session->session, is_server ? GNUTLS_SERVER : GNUTLS_CLIENT );
gnutls_set_default_priority( session->session );
if ( ctx->kx_list ) {
gnutls_kx_set_priority( session->session, ctx->kx_list );
gnutls_cipher_set_priority( session->session, ctx->cipher_list );
gnutls_mac_set_priority( session->session, ctx->mac_list );
}
if ( ctx->cred )
gnutls_credentials_set( session->session, GNUTLS_CRD_CERTIFICATE, ctx->cred );
if ( is_server ) {
int flag = 0;
if ( ctx->lo->ldo_tls_require_cert ) {
flag = GNUTLS_CERT_REQUEST;
if ( ctx->lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_DEMAND ||
ctx->lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_HARD )
flag = GNUTLS_CERT_REQUIRE;
gnutls_certificate_server_set_request( session->session, flag );
}
}
return session;
}
void
tls_session_free ( tls_session * session )
{
ber_memfree ( session );
}
#define tls_session_connect( ssl ) gnutls_handshake( ssl->session )
#define tls_session_accept( ssl ) gnutls_handshake( ssl->session )
/* suites is a string of colon-separated cipher suite names. */
static int
tls_parse_ciphers( tls_ctx *ctx, char *suites )
{
char *ptr, *end;
int i, j, len, num;
int *list, nkx = 0, ncipher = 0, nmac = 0;
int *kx, *cipher, *mac;
num = 0;
ptr = suites;
do {
end = strchr(ptr, ':');
if ( end )
len = end - ptr;
else
len = strlen(ptr);
for (i=0; i<n_ciphers; i++) {
if ( !strncasecmp( ciphers[i].name, ptr, len )) {
num++;
break;
}
}
if ( i == n_ciphers ) {
/* unrecognized cipher suite */
return -1;
}
} while (end);
/* Space for all 3 lists */
list = LDAP_MALLOC( (num+1) * sizeof(int) * 3 );
if ( !list )
return -1;
kx = list;
cipher = kx+num+1;
mac = cipher+num+1;
ptr = suites;
do {
end = strchr(ptr, ':');
if ( end )
len = end - ptr;
else
len = strlen(ptr);
for (i=0; i<n_ciphers; i++) {
/* For each cipher suite, insert its algorithms into
* their respective priority lists. Make sure they
* only appear once in each list.
*/
if ( !strncasecmp( ciphers[i].name, ptr, len )) {
for (j=0; j<nkx; j++)
if ( kx[j] == ciphers[i].kx )
break;
if ( j == nkx )
kx[nkx++] = ciphers[i].kx;
for (j=0; j<ncipher; j++)
if ( cipher[j] == ciphers[i].cipher )
break;
if ( j == ncipher )
cipher[ncipher++] = ciphers[i].cipher;
for (j=0; j<nmac; j++)
if ( mac[j] == ciphers[i].mac )
break;
if ( j == nmac )
mac[nmac++] = ciphers[i].mac;
break;
}
}
} while (end);
kx[nkx] = 0;
cipher[ncipher] = 0;
mac[nmac] = 0;
ctx->kx_list = kx;
ctx->cipher_list = cipher;
ctx->mac_list = mac;
return 0;
}
#else /* OpenSSL */
typedef SSL_CTX tls_ctx;
typedef SSL tls_session;
static int tls_opt_trace = 1;
static char *tls_opt_randfile = NULL;
static void tls_report_error( void );
static void tls_info_cb( const SSL *ssl, int where, int ret );
static int tls_verify_cb( int ok, X509_STORE_CTX *ctx );
static int tls_verify_ok( int ok, X509_STORE_CTX *ctx );
static RSA * tls_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );
static DH * tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length );
typedef struct dhplist {
struct dhplist *next;
int keylength;
DH *param;
} dhplist;
static dhplist *dhparams;
static int tls_seed_PRNG( const char *randfile );
#ifdef LDAP_R_COMPILE
/*
* provide mutexes for the SSLeay library.
*/
static ldap_pvt_thread_mutex_t tls_mutexes[CRYPTO_NUM_LOCKS];
static void tls_locking_cb( int mode, int type, const char *file, int line )
{
if ( mode & CRYPTO_LOCK ) {
ldap_pvt_thread_mutex_lock( &tls_mutexes[type] );
} else {
ldap_pvt_thread_mutex_unlock( &tls_mutexes[type] );
}
}
static void tls_init_threads( void )
{
int i;
for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) {
ldap_pvt_thread_mutex_init( &tls_mutexes[i] );
}
CRYPTO_set_locking_callback( tls_locking_cb );
CRYPTO_set_id_callback( ldap_pvt_thread_self );
/* FIXME: CRYPTO_set_id_callback only works when ldap_pvt_thread_t
* is an integral type that fits in an unsigned long
*/
}
#endif /* LDAP_R_COMPILE */
void
ldap_pvt_tls_ctx_free ( void *c )
{
SSL_CTX_free( c );
}
static void *
tls_ctx_new( struct ldapoptions *lo )
{
return SSL_CTX_new( SSLv23_method() );
}
static void
tls_ctx_ref( void *c )
{
SSL_CTX *ctx = c;
CRYPTO_add( &ctx->references, 1, CRYPTO_LOCK_SSL_CTX );
}
static tls_session *
tls_session_new( tls_ctx *ctx, int is_server )
{
return SSL_new( ctx );
}
#define tls_session_connect( ssl ) SSL_connect( ssl )
#define tls_session_accept( ssl ) SSL_accept( ssl )
static STACK_OF(X509_NAME) *
get_ca_list( char * bundle, char * dir )
{
STACK_OF(X509_NAME) *ca_list = NULL;
if ( bundle ) {
ca_list = SSL_load_client_CA_file( bundle );
}
#if defined(HAVE_DIRENT_H) || defined(dirent)
if ( dir ) {
int freeit = 0;
if ( !ca_list ) {
ca_list = sk_X509_NAME_new_null();
freeit = 1;
}
if ( !SSL_add_dir_cert_subjects_to_stack( ca_list, dir ) &&
freeit ) {
sk_X509_NAME_free( ca_list );
ca_list = NULL;
}
}
#endif
return ca_list;
}
#endif /* HAVE_GNUTLS */
#ifdef LDAP_R_COMPILE
/*
* an extra mutex for the default ctx.
*/
static ldap_pvt_thread_mutex_t tls_def_ctx_mutex;
#endif
void
ldap_int_tls_destroy( struct ldapoptions *lo )
{
if ( lo->ldo_tls_ctx ) {
ldap_pvt_tls_ctx_free( lo->ldo_tls_ctx );
lo->ldo_tls_ctx = NULL;
}
if ( lo->ldo_tls_certfile ) {
LDAP_FREE( lo->ldo_tls_certfile );
lo->ldo_tls_certfile = NULL;
}
if ( lo->ldo_tls_keyfile ) {
LDAP_FREE( lo->ldo_tls_keyfile );
lo->ldo_tls_keyfile = NULL;
}
if ( lo->ldo_tls_dhfile ) {
LDAP_FREE( lo->ldo_tls_dhfile );
lo->ldo_tls_dhfile = NULL;
}
if ( lo->ldo_tls_cacertfile ) {
LDAP_FREE( lo->ldo_tls_cacertfile );
lo->ldo_tls_cacertfile = NULL;
}
if ( lo->ldo_tls_cacertdir ) {
LDAP_FREE( lo->ldo_tls_cacertdir );
lo->ldo_tls_cacertdir = NULL;
}
if ( lo->ldo_tls_ciphersuite ) {
LDAP_FREE( lo->ldo_tls_ciphersuite );
lo->ldo_tls_ciphersuite = NULL;
}
#ifdef HAVE_GNUTLS
if ( lo->ldo_tls_crlfile ) {
LDAP_FREE( lo->ldo_tls_crlfile );
lo->ldo_tls_crlfile = NULL;
}
#endif
}
/*
* Tear down the TLS subsystem. Should only be called once.
*/
void
ldap_pvt_tls_destroy( void )
{
struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
ldap_int_tls_destroy( lo );
#ifdef HAVE_GNUTLS
LDAP_FREE( ciphers );
ciphers = NULL;
gnutls_global_deinit();
#else
EVP_cleanup();
ERR_remove_state(0);
ERR_free_strings();
if ( tls_opt_randfile ) {
LDAP_FREE( tls_opt_randfile );
tls_opt_randfile = NULL;
}
#endif
}
/*
* Initialize TLS subsystem. Should be called only once.
*/
int
ldap_pvt_tls_init( void )
{
static int tls_initialized = 0;
if ( tls_initialized++ ) return 0;
#ifdef LDAP_R_COMPILE
tls_init_threads();
ldap_pvt_thread_mutex_init( &tls_def_ctx_mutex );
#endif
#ifdef HAVE_GNUTLS
gnutls_global_init ();
/* GNUtls cipher suite handling: The library ought to parse suite
* names for us, but it doesn't. It will return a list of suite names
* that it supports, so we can do parsing ourselves. It ought to tell
* us how long the list is, but it doesn't do that either, so we just
* have to count it manually...
*/
{
int i = 0;
tls_cipher_suite *ptr, tmp;
char cs_id[2];
while ( gnutls_cipher_suite_info( i, cs_id, &tmp.kx, &tmp.cipher,
&tmp.mac, &tmp.version ))
i++;
n_ciphers = i;
/* Store a copy */
ciphers = LDAP_MALLOC(n_ciphers * sizeof(tls_cipher_suite));
if ( !ciphers )
return -1;
for ( i=0; i<n_ciphers; i++ ) {
ciphers[i].name = gnutls_cipher_suite_info( i, cs_id,
&ciphers[i].kx, &ciphers[i].cipher, &ciphers[i].mac,
&ciphers[i].version );
}
}
#else /* !HAVE_GNUTLS */
#ifdef HAVE_EBCDIC
{
char *file = LDAP_STRDUP( tls_opt_randfile );
if ( file ) __atoe( file );
(void) tls_seed_PRNG( file );
LDAP_FREE( file );
}
#else
(void) tls_seed_PRNG( tls_opt_randfile );
#endif
SSL_load_error_strings();
SSLeay_add_ssl_algorithms();
/* FIXME: mod_ssl does this */
X509V3_add_standard_extensions();
#endif /* HAVE_GNUTLS */
return 0;
}
/*
* initialize a new TLS context
*/
static int
ldap_int_tls_init_ctx( struct ldapoptions *lo, int is_server )
{
int i, rc = 0;
char *ciphersuite = lo->ldo_tls_ciphersuite;
char *cacertfile = lo->ldo_tls_cacertfile;
char *cacertdir = lo->ldo_tls_cacertdir;
char *certfile = lo->ldo_tls_certfile;
char *keyfile = lo->ldo_tls_keyfile;
#ifdef HAVE_GNUTLS
char *crlfile = lo->ldo_tls_crlfile;
#else
char *dhfile = lo->ldo_tls_dhfile;
#endif
if ( lo->ldo_tls_ctx )
return 0;
ldap_pvt_tls_init();
if ( is_server && !certfile && !keyfile && !cacertfile && !cacertdir ) {
/* minimum configuration not provided */
return LDAP_NOT_SUPPORTED;
}
#ifdef HAVE_EBCDIC
/* This ASCII/EBCDIC handling is a real pain! */
if ( ciphersuite ) {
ciphersuite = LDAP_STRDUP( ciphersuite );
__atoe( ciphersuite );
}
if ( cacertfile ) {
cacertfile = LDAP_STRDUP( cacertfile );
__atoe( cacertfile );
}
if ( certfile ) {
certfile = LDAP_STRDUP( certfile );
__atoe( certfile );
}
if ( keyfile ) {
keyfile = LDAP_STRDUP( keyfile );
__atoe( keyfile );
}
#ifdef HAVE_GNUTLS
if ( crlfile ) {
crlfile = LDAP_STRDUP( crlfile );
__atoe( crlfile );
}
#else
if ( cacertdir ) {
cacertdir = LDAP_STRDUP( cacertdir );
__atoe( cacertdir );
}
if ( dhfile ) {
dhfile = LDAP_STRDUP( dhfile );
__atoe( dhfile );
}
#endif
#endif
lo->ldo_tls_ctx = tls_ctx_new( lo );
if ( lo->ldo_tls_ctx == NULL ) {
#ifdef HAVE_GNUTLS
Debug( LDAP_DEBUG_ANY,
"TLS: could not allocate default ctx.\n",
0,0,0);
#else
Debug( LDAP_DEBUG_ANY,
"TLS: could not allocate default ctx (%lu).\n",
ERR_peek_error(),0,0);
#endif
rc = -1;
goto error_exit;
}
#ifdef HAVE_GNUTLS
if ( lo->ldo_tls_ciphersuite &&
tls_parse_ciphers( lo->ldo_tls_ctx,
ciphersuite )) {
Debug( LDAP_DEBUG_ANY,
"TLS: could not set cipher list %s.\n",
lo->ldo_tls_ciphersuite, 0, 0 );
rc = -1;
goto error_exit;
}
if (lo->ldo_tls_cacertdir != NULL) {
Debug( LDAP_DEBUG_ANY,
"TLS: warning: cacertdir not implemented for gnutls\n",
NULL, NULL, NULL );
}
if (lo->ldo_tls_cacertfile != NULL) {
rc = gnutls_certificate_set_x509_trust_file(
((tls_ctx*) lo->ldo_tls_ctx)->cred,
cacertfile,
GNUTLS_X509_FMT_PEM );
if ( rc < 0 ) goto error_exit;
}
if ( lo->ldo_tls_certfile && lo->ldo_tls_keyfile ) {
rc = gnutls_certificate_set_x509_key_file(
((tls_ctx*) lo->ldo_tls_ctx)->cred,
certfile,
keyfile,
GNUTLS_X509_FMT_PEM );
if ( rc ) goto error_exit;
} else if ( lo->ldo_tls_certfile || lo->ldo_tls_keyfile ) {
Debug( LDAP_DEBUG_ANY,
"TLS: only one of certfile and keyfile specified\n",
NULL, NULL, NULL );
rc = 1;
goto error_exit;
}
if ( lo->ldo_tls_dhfile ) {
Debug( LDAP_DEBUG_ANY,
"TLS: warning: ignoring dhfile\n",
NULL, NULL, NULL );
}
if ( lo->ldo_tls_crlfile ) {
rc = gnutls_certificate_set_x509_crl_file(
((tls_ctx*) lo->ldo_tls_ctx)->cred,
crlfile,
GNUTLS_X509_FMT_PEM );
if ( rc < 0 ) goto error_exit;
}
if ( is_server ) {
gnutls_dh_params_init (&((tls_ctx*)
lo->ldo_tls_ctx)->dh_params);
gnutls_dh_params_generate2 (((tls_ctx*)
lo->ldo_tls_ctx)->dh_params,
DH_BITS);
}
#else /* !HAVE_GNUTLS */
if ( is_server ) {
SSL_CTX_set_session_id_context( lo->ldo_tls_ctx,
(const unsigned char *) "OpenLDAP", sizeof("OpenLDAP")-1 );
}
if ( lo->ldo_tls_ciphersuite &&
!SSL_CTX_set_cipher_list( lo->ldo_tls_ctx, ciphersuite ) )
{
Debug( LDAP_DEBUG_ANY,
"TLS: could not set cipher list %s.\n",
lo->ldo_tls_ciphersuite, 0, 0 );
tls_report_error();
rc = -1;
goto error_exit;
}
if (lo->ldo_tls_cacertfile != NULL || lo->ldo_tls_cacertdir != NULL) {
if ( !SSL_CTX_load_verify_locations( lo->ldo_tls_ctx,
cacertfile, cacertdir ) ||
!SSL_CTX_set_default_verify_paths( lo->ldo_tls_ctx ) )
{
Debug( LDAP_DEBUG_ANY, "TLS: "
"could not load verify locations (file:`%s',dir:`%s').\n",
lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "",
0 );
tls_report_error();
rc = -1;
goto error_exit;
}
if ( is_server ) {
STACK_OF(X509_NAME) *calist;
/* List of CA names to send to a client */
calist = get_ca_list( cacertfile, cacertdir );
if ( !calist ) {
Debug( LDAP_DEBUG_ANY, "TLS: "
"could not load client CA list (file:`%s',dir:`%s').\n",
lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "",
0 );
tls_report_error();
rc = -1;
goto error_exit;
}
SSL_CTX_set_client_CA_list( lo->ldo_tls_ctx, calist );
}
}
if ( lo->ldo_tls_certfile &&
!SSL_CTX_use_certificate_file( lo->ldo_tls_ctx,
certfile, SSL_FILETYPE_PEM ) )
{
Debug( LDAP_DEBUG_ANY,
"TLS: could not use certificate `%s'.\n",
lo->ldo_tls_certfile,0,0);
tls_report_error();
rc = -1;
goto error_exit;
}
/* Key validity is checked automatically if cert has already been set */
if ( lo->ldo_tls_keyfile &&
!SSL_CTX_use_PrivateKey_file( lo->ldo_tls_ctx,
keyfile, SSL_FILETYPE_PEM ) )
{
Debug( LDAP_DEBUG_ANY,
"TLS: could not use key file `%s'.\n",
lo->ldo_tls_keyfile,0,0);
tls_report_error();
rc = -1;
goto error_exit;
}
if ( lo->ldo_tls_dhfile ) {
DH *dh = NULL;
BIO *bio;
dhplist *p;
if (( bio=BIO_new_file( dhfile,"r" )) == NULL ) {
Debug( LDAP_DEBUG_ANY,
"TLS: could not use DH parameters file `%s'.\n",
lo->ldo_tls_dhfile,0,0);
tls_report_error();
rc = -1;
goto error_exit;
}
while (( dh=PEM_read_bio_DHparams( bio, NULL, NULL, NULL ))) {
p = LDAP_MALLOC( sizeof(dhplist) );
if ( p != NULL ) {
p->keylength = DH_size( dh ) * 8;
p->param = dh;
p->next = dhparams;
dhparams = p;
}
}
BIO_free( bio );
}
if ( tls_opt_trace ) {
SSL_CTX_set_info_callback( (SSL_CTX *)lo->ldo_tls_ctx, tls_info_cb );
}
i = SSL_VERIFY_NONE;
if ( lo->ldo_tls_require_cert ) {
i = SSL_VERIFY_PEER;
if ( lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_DEMAND ||
lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_HARD ) {
i |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
}
}
SSL_CTX_set_verify( lo->ldo_tls_ctx, i,
lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ?
tls_verify_ok : tls_verify_cb );
SSL_CTX_set_tmp_rsa_callback( lo->ldo_tls_ctx, tls_tmp_rsa_cb );
if ( lo->ldo_tls_dhfile ) {
SSL_CTX_set_tmp_dh_callback( lo->ldo_tls_ctx, tls_tmp_dh_cb );
}
#ifdef HAVE_OPENSSL_CRL
if ( lo->ldo_tls_crlcheck ) {
X509_STORE *x509_s = SSL_CTX_get_cert_store( lo->ldo_tls_ctx );
if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_PEER ) {
X509_STORE_set_flags( x509_s, X509_V_FLAG_CRL_CHECK );
} else if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_ALL ) {
X509_STORE_set_flags( x509_s,
X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL );
}
}
#endif
#endif /* HAVE_GNUTLS */
error_exit:
if ( rc == -1 && lo->ldo_tls_ctx != NULL ) {
ldap_pvt_tls_ctx_free( lo->ldo_tls_ctx );
lo->ldo_tls_ctx = NULL;
}
#ifdef HAVE_EBCDIC
LDAP_FREE( ciphersuite );
LDAP_FREE( cacertfile );
LDAP_FREE( certfile );
LDAP_FREE( keyfile );
#ifdef HAVE_GNUTLS
LDAP_FREE( crlfile );
#else
LDAP_FREE( cacertdir );
LDAP_FREE( dhfile );
#endif
#endif
return rc;
}
/*
* initialize the default context
*/
int
ldap_pvt_tls_init_def_ctx( int is_server )
{
struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
int rc;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &tls_def_ctx_mutex );
#endif
rc = ldap_int_tls_init_ctx( lo, is_server );
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex );
#endif
return rc;
}
static tls_session *
alloc_handle( void *ctx_arg, int is_server )
{
tls_ctx *ctx;
tls_session *ssl;
if ( ctx_arg ) {
ctx = ctx_arg;
} else {
struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
if ( ldap_pvt_tls_init_def_ctx( is_server ) < 0 ) return NULL;
ctx = lo->ldo_tls_ctx;
}
ssl = tls_session_new( ctx, is_server );
if ( ssl == NULL ) {
Debug( LDAP_DEBUG_ANY,"TLS: can't create ssl handle.\n",0,0,0);
return NULL;
}
return ssl;
}
static int
update_flags( Sockbuf *sb, tls_session * ssl, int rc )
{
sb->sb_trans_needs_read = 0;
sb->sb_trans_needs_write = 0;
#ifdef HAVE_GNUTLS
if ( rc != GNUTLS_E_INTERRUPTED && rc != GNUTLS_E_AGAIN )
return 0;
switch (gnutls_record_get_direction (ssl->session)) {
case 0:
sb->sb_trans_needs_read = 1;
return 1;
case 1:
sb->sb_trans_needs_write = 1;
return 1;
}
#else /* !HAVE_GNUTLS */
rc = SSL_get_error(ssl, rc);
if (rc == SSL_ERROR_WANT_READ) {
sb->sb_trans_needs_read = 1;
return 1;
} else if (rc == SSL_ERROR_WANT_WRITE) {
sb->sb_trans_needs_write = 1;
return 1;
} else if (rc == SSL_ERROR_WANT_CONNECT) {
return 1;
}
#endif /* HAVE_GNUTLS */
return 0;
}
/*
* TLS support for LBER Sockbufs
*/
struct tls_data {
tls_session *ssl;
Sockbuf_IO_Desc *sbiod;
};
#ifdef HAVE_GNUTLS
static ssize_t
sb_gtls_recv( gnutls_transport_ptr_t ptr, void *buf, size_t len )
{
struct tls_data *p;
if ( buf == NULL || len <= 0 ) return 0;
p = (struct tls_data *)ptr;
if ( p == NULL || p->sbiod == NULL ) {
return 0;
}
return LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );
}
static ssize_t
sb_gtls_send( gnutls_transport_ptr_t ptr, const void *buf, size_t len )
{
struct tls_data *p;
if ( buf == NULL || len <= 0 ) return 0;
p = (struct tls_data *)ptr;
if ( p == NULL || p->sbiod == NULL ) {
return 0;
}
return LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len );
}
static int
sb_tls_setup( Sockbuf_IO_Desc *sbiod, void *arg )
{
struct tls_data *p;
tls_session *session = arg;
assert( sbiod != NULL );
p = LBER_MALLOC( sizeof( *p ) );
if ( p == NULL ) {
return -1;
}
gnutls_transport_set_ptr( session->session, (gnutls_transport_ptr)p );
gnutls_transport_set_pull_function( session->session, sb_gtls_recv );
gnutls_transport_set_push_function( session->session, sb_gtls_send );
p->ssl = arg;
p->sbiod = sbiod;
sbiod->sbiod_pvt = p;
return 0;
}
static int
sb_tls_remove( Sockbuf_IO_Desc *sbiod )
{
struct tls_data *p;
assert( sbiod != NULL );
assert( sbiod->sbiod_pvt != NULL );
p = (struct tls_data *)sbiod->sbiod_pvt;
gnutls_deinit ( p->ssl->session );
LBER_FREE( p->ssl );
LBER_FREE( sbiod->sbiod_pvt );
sbiod->sbiod_pvt = NULL;
return 0;
}
static int
sb_tls_close( Sockbuf_IO_Desc *sbiod )
{
struct tls_data *p;
assert( sbiod != NULL );
assert( sbiod->sbiod_pvt != NULL );
p = (struct tls_data *)sbiod->sbiod_pvt;
gnutls_bye ( p->ssl->session, GNUTLS_SHUT_RDWR );
return 0;
}
static int
sb_tls_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
{
struct tls_data *p;
assert( sbiod != NULL );
assert( sbiod->sbiod_pvt != NULL );
p = (struct tls_data *)sbiod->sbiod_pvt;
if ( opt == LBER_SB_OPT_GET_SSL ) {
*((tls_session **)arg) = p->ssl;
return 1;
} else if ( opt == LBER_SB_OPT_DATA_READY ) {
if( gnutls_record_check_pending( p->ssl->session ) > 0 ) {
return 1;
}
}
return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
}
static ber_slen_t
sb_tls_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
struct tls_data *p;
ber_slen_t ret;
int err;
assert( sbiod != NULL );
assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
p = (struct tls_data *)sbiod->sbiod_pvt;
ret = gnutls_record_recv ( p->ssl->session, buf, len );
switch (ret) {
case GNUTLS_E_INTERRUPTED:
case GNUTLS_E_AGAIN:
sbiod->sbiod_sb->sb_trans_needs_read = 1;
sock_errset(EWOULDBLOCK);
ret = 0;
break;
case GNUTLS_E_REHANDSHAKE:
for ( ret = gnutls_handshake ( p->ssl->session );
ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN;
ret = gnutls_handshake ( p->ssl->session ) );
sbiod->sbiod_sb->sb_trans_needs_read = 1;
ret = 0;
break;
default:
sbiod->sbiod_sb->sb_trans_needs_read = 0;
}
return ret;
}
static ber_slen_t
sb_tls_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
struct tls_data *p;
ber_slen_t ret;
int err;
assert( sbiod != NULL );
assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
p = (struct tls_data *)sbiod->sbiod_pvt;
ret = gnutls_record_send ( p->ssl->session, (char *)buf, len );
if ( ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN ) {
sbiod->sbiod_sb->sb_trans_needs_write = 1;
sock_errset(EWOULDBLOCK);
ret = 0;
} else {
sbiod->sbiod_sb->sb_trans_needs_write = 0;
}
return ret;
}
#else /* !HAVE_GNUTLS */
static int
sb_tls_bio_create( BIO *b ) {
b->init = 1;
b->num = 0;
b->ptr = NULL;
b->flags = 0;
return 1;
}
static int
sb_tls_bio_destroy( BIO *b )
{
if ( b == NULL ) return 0;
b->ptr = NULL; /* sb_tls_remove() will free it */
b->init = 0;
b->flags = 0;
return 1;
}
static int
sb_tls_bio_read( BIO *b, char *buf, int len )
{
struct tls_data *p;
int ret;
if ( buf == NULL || len <= 0 ) return 0;
p = (struct tls_data *)b->ptr;
if ( p == NULL || p->sbiod == NULL ) {
return 0;
}
ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );
BIO_clear_retry_flags( b );
if ( ret < 0 ) {
int err = sock_errno();
if ( err == EAGAIN || err == EWOULDBLOCK ) {
BIO_set_retry_read( b );
}
}
return ret;
}
static int
sb_tls_bio_write( BIO *b, const char *buf, int len )
{
struct tls_data *p;
int ret;
if ( buf == NULL || len <= 0 ) return 0;
p = (struct tls_data *)b->ptr;
if ( p == NULL || p->sbiod == NULL ) {
return 0;
}
ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len );
BIO_clear_retry_flags( b );
if ( ret < 0 ) {
int err = sock_errno();
if ( err == EAGAIN || err == EWOULDBLOCK ) {
BIO_set_retry_write( b );
}
}
return ret;
}
static long
sb_tls_bio_ctrl( BIO *b, int cmd, long num, void *ptr )
{
if ( cmd == BIO_CTRL_FLUSH ) {
/* The OpenSSL library needs this */
return 1;
}
return 0;
}
static int
sb_tls_bio_gets( BIO *b, char *buf, int len )
{
return -1;
}
static int
sb_tls_bio_puts( BIO *b, const char *str )
{
return sb_tls_bio_write( b, str, strlen( str ) );
}
static BIO_METHOD sb_tls_bio_method =
{
( 100 | 0x400 ), /* it's a source/sink BIO */
"sockbuf glue",
sb_tls_bio_write,
sb_tls_bio_read,
sb_tls_bio_puts,
sb_tls_bio_gets,
sb_tls_bio_ctrl,
sb_tls_bio_create,
sb_tls_bio_destroy
};
static int
sb_tls_setup( Sockbuf_IO_Desc *sbiod, void *arg )
{
struct tls_data *p;
BIO *bio;
assert( sbiod != NULL );
p = LBER_MALLOC( sizeof( *p ) );
if ( p == NULL ) {
return -1;
}
p->ssl = (SSL *)arg;
p->sbiod = sbiod;
bio = BIO_new( &sb_tls_bio_method );
bio->ptr = (void *)p;
SSL_set_bio( p->ssl, bio, bio );
sbiod->sbiod_pvt = p;
return 0;
}
static int
sb_tls_remove( Sockbuf_IO_Desc *sbiod )
{
struct tls_data *p;
assert( sbiod != NULL );
assert( sbiod->sbiod_pvt != NULL );
p = (struct tls_data *)sbiod->sbiod_pvt;
SSL_free( p->ssl );
LBER_FREE( sbiod->sbiod_pvt );
sbiod->sbiod_pvt = NULL;
return 0;
}
static int
sb_tls_close( Sockbuf_IO_Desc *sbiod )
{
struct tls_data *p;
assert( sbiod != NULL );
assert( sbiod->sbiod_pvt != NULL );
p = (struct tls_data *)sbiod->sbiod_pvt;
SSL_shutdown( p->ssl );
return 0;
}
static int
sb_tls_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
{
struct tls_data *p;
assert( sbiod != NULL );
assert( sbiod->sbiod_pvt != NULL );
p = (struct tls_data *)sbiod->sbiod_pvt;
if ( opt == LBER_SB_OPT_GET_SSL ) {
*((SSL **)arg) = p->ssl;
return 1;
} else if ( opt == LBER_SB_OPT_DATA_READY ) {
if( SSL_pending( p->ssl ) > 0 ) {
return 1;
}
}
return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
}
static ber_slen_t
sb_tls_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
struct tls_data *p;
ber_slen_t ret;
int err;
assert( sbiod != NULL );
assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
p = (struct tls_data *)sbiod->sbiod_pvt;
ret = SSL_read( p->ssl, (char *)buf, len );
#ifdef HAVE_WINSOCK
errno = WSAGetLastError();
#endif
err = SSL_get_error( p->ssl, ret );
if (err == SSL_ERROR_WANT_READ ) {
sbiod->sbiod_sb->sb_trans_needs_read = 1;
sock_errset(EWOULDBLOCK);
}
else
sbiod->sbiod_sb->sb_trans_needs_read = 0;
return ret;
}
static ber_slen_t
sb_tls_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
struct tls_data *p;
ber_slen_t ret;
int err;
assert( sbiod != NULL );
assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
p = (struct tls_data *)sbiod->sbiod_pvt;
ret = SSL_write( p->ssl, (char *)buf, len );
#ifdef HAVE_WINSOCK
errno = WSAGetLastError();
#endif
err = SSL_get_error( p->ssl, ret );
if (err == SSL_ERROR_WANT_WRITE ) {
sbiod->sbiod_sb->sb_trans_needs_write = 1;
sock_errset(EWOULDBLOCK);
} else {
sbiod->sbiod_sb->sb_trans_needs_write = 0;
}
return ret;
}
#endif
static Sockbuf_IO sb_tls_sbio =
{
sb_tls_setup, /* sbi_setup */
sb_tls_remove, /* sbi_remove */
sb_tls_ctrl, /* sbi_ctrl */
sb_tls_read, /* sbi_read */
sb_tls_write, /* sbi_write */
sb_tls_close /* sbi_close */
};
#ifdef HAVE_GNUTLS
/* Certs are not automatically varified during the handshake */
static int
tls_cert_verify( tls_session *ssl )
{
unsigned int status = 0;
int err;
time_t now = time(0);
err = gnutls_certificate_verify_peers2( ssl->session, &status );
if ( err < 0 ) {
Debug( LDAP_DEBUG_ANY,"TLS: gnutls_certificate_verify_peers2 failed %d\n",
err,0,0 );
return -1;
}
if ( status ) {
Debug( LDAP_DEBUG_TRACE,"TLS: peer cert untrusted or revoked (0x%x)\n",
status, 0,0 );
return -1;
}
if ( gnutls_certificate_expiration_time_peers( ssl->session ) < now ) {
Debug( LDAP_DEBUG_ANY, "TLS: peer certificate is expired\n",
0, 0, 0 );
return -1;
}
if ( gnutls_certificate_activation_time_peers( ssl->session ) > now ) {
Debug( LDAP_DEBUG_ANY, "TLS: peer certificate not yet active\n",
0, 0, 0 );
return -1;
}
return 0;
}
#endif /* HAVE_GNUTLS */
/*
* Call this to do a TLS connect on a sockbuf. ctx_arg can be
* a SSL_CTX * or NULL, in which case the default ctx is used.
*
* Return value:
*
* 0 - Success. Connection is ready for communication.
* <0 - Error. Can't create a TLS stream.
* >0 - Partial success.
* Do a select (using information from lber_pvt_sb_needs_{read,write}
* and call again.
*/
static int
ldap_int_tls_connect( LDAP *ld, LDAPConn *conn )
{
Sockbuf *sb = conn->lconn_sb;
int err;
tls_session *ssl;
if ( HAS_TLS( sb ) ) {
ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
} else {
struct ldapoptions *lo;
tls_ctx *ctx;
ctx = ld->ld_options.ldo_tls_ctx;
ssl = alloc_handle( ctx, 0 );
if ( ssl == NULL ) return -1;
#ifdef LDAP_DEBUG
ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
#endif
ber_sockbuf_add_io( sb, &sb_tls_sbio,
LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
lo = LDAP_INT_GLOBAL_OPT();
if( ctx == NULL ) {
ctx = lo->ldo_tls_ctx;
ld->ld_options.ldo_tls_ctx = ctx;
tls_ctx_ref( ctx );
}
if ( ld->ld_options.ldo_tls_connect_cb )
ld->ld_options.ldo_tls_connect_cb( ld, ssl, ctx,
ld->ld_options.ldo_tls_connect_arg );
if ( lo && lo->ldo_tls_connect_cb && lo->ldo_tls_connect_cb !=
ld->ld_options.ldo_tls_connect_cb )
lo->ldo_tls_connect_cb( ld, ssl, ctx, lo->ldo_tls_connect_arg );
}
err = tls_session_connect( ssl );
#ifdef HAVE_WINSOCK
errno = WSAGetLastError();
#endif
#ifdef HAVE_GNUTLS
if ( err < 0 )
#else
if ( err <= 0 )
#endif
{
if ( update_flags( sb, ssl, err )) {
return 1;
}
#ifndef HAVE_GNUTLS
if ((err = ERR_peek_error()))
#endif
{
if ( ld->ld_error ) {
LDAP_FREE( ld->ld_error );
}
#ifdef HAVE_GNUTLS
ld->ld_error = LDAP_STRDUP(gnutls_strerror( err ));
#else
{
char buf[256];
ld->ld_error = LDAP_STRDUP(ERR_error_string(err, buf));
}
#endif
#ifdef HAVE_EBCDIC
if ( ld->ld_error ) __etoa(ld->ld_error);
#endif
}
Debug( LDAP_DEBUG_ANY,"TLS: can't connect: %s.\n",
ld->ld_error ? ld->ld_error : "" ,0,0);
ber_sockbuf_remove_io( sb, &sb_tls_sbio,
LBER_SBIOD_LEVEL_TRANSPORT );
#ifdef LDAP_DEBUG
ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
LBER_SBIOD_LEVEL_TRANSPORT );
#endif
return -1;
}
#ifdef HAVE_GNUTLS
if ( ld->ld_options.ldo_tls_require_cert != LDAP_OPT_X_TLS_NEVER ) {
err = tls_cert_verify( ssl );
if ( err && ld->ld_options.ldo_tls_require_cert != LDAP_OPT_X_TLS_ALLOW )
return err;
}
#endif
return 0;
}
/*
* Call this to do a TLS accept on a sockbuf.
* Everything else is the same as with tls_connect.
*/
int
ldap_pvt_tls_accept( Sockbuf *sb, void *ctx_arg )
{
int err;
tls_session *ssl;
if ( HAS_TLS( sb ) ) {
ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
} else {
ssl = alloc_handle( ctx_arg, 1 );
if ( ssl == NULL ) return -1;
#ifdef LDAP_DEBUG
ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
#endif
ber_sockbuf_add_io( sb, &sb_tls_sbio,
LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
}
err = tls_session_accept( ssl );
#ifdef HAVE_WINSOCK
errno = WSAGetLastError();
#endif
#ifdef HAVE_GNUTLS
if ( err < 0 )
#else
if ( err <= 0 )
#endif
{
if ( update_flags( sb, ssl, err )) return 1;
#ifdef HAVE_GNUTLS
Debug( LDAP_DEBUG_ANY,"TLS: can't accept: %s.\n",
gnutls_strerror( err ),0,0 );
#else
Debug( LDAP_DEBUG_ANY,"TLS: can't accept.\n",0,0,0 );
tls_report_error();
#endif
ber_sockbuf_remove_io( sb, &sb_tls_sbio,
LBER_SBIOD_LEVEL_TRANSPORT );
#ifdef LDAP_DEBUG
ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
LBER_SBIOD_LEVEL_TRANSPORT );
#endif
return -1;
}
#ifdef HAVE_GNUTLS
if ( ssl->ctx->lo->ldo_tls_require_cert != LDAP_OPT_X_TLS_NEVER ) {
err = tls_cert_verify( ssl );
if ( err && ssl->ctx->lo->ldo_tls_require_cert != LDAP_OPT_X_TLS_ALLOW )
return err;
}
#endif
return 0;
}
int
ldap_pvt_tls_inplace ( Sockbuf *sb )
{
return HAS_TLS( sb ) ? 1 : 0;
}
int
ldap_tls_inplace( LDAP *ld )
{
Sockbuf *sb = NULL;
if ( ld->ld_defconn && ld->ld_defconn->lconn_sb ) {
sb = ld->ld_defconn->lconn_sb;
} else if ( ld->ld_sb ) {
sb = ld->ld_sb;
} else {
return 0;
}
return ldap_pvt_tls_inplace( sb );
}
static void
x509_cert_get_dn( struct berval *cert, struct berval *dn, int get_subject )
{
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
ber_tag_t tag;
ber_len_t len;
ber_int_t i;
ber_init2( ber, cert, LBER_USE_DER );
tag = ber_skip_tag( ber, &len ); /* Sequence */
tag = ber_skip_tag( ber, &len ); /* Sequence */
tag = ber_skip_tag( ber, &len ); /* Context + Constructed (version) */
if ( tag == 0xa0 ) /* Version is optional */
tag = ber_get_int( ber, &i ); /* Int: Version */
tag = ber_get_int( ber, &i ); /* Int: Serial */
tag = ber_skip_tag( ber, &len ); /* Sequence: Signature */
ber_skip_data( ber, len );
if ( !get_subject ) {
tag = ber_peek_tag( ber, &len ); /* Sequence: Issuer DN */
} else {
tag = ber_skip_tag( ber, &len );
ber_skip_data( ber, len );
tag = ber_skip_tag( ber, &len ); /* Sequence: Validity */
ber_skip_data( ber, len );
tag = ber_peek_tag( ber, &len ); /* Sequence: Subject DN */
}
len = ber_ptrlen( ber );
dn->bv_val = cert->bv_val + len;
dn->bv_len = cert->bv_len - len;
}
#ifdef HAVE_GNUTLS
static int
tls_get_cert_dn( tls_session *session, struct berval *dnbv )
{
if ( !session->peer_der_dn.bv_val ) {
const gnutls_datum_t *peer_cert_list;
int list_size;
struct berval bv;
peer_cert_list = gnutls_certificate_get_peers( session->session,
&list_size );
if ( !peer_cert_list ) return LDAP_INVALID_CREDENTIALS;
bv.bv_len = peer_cert_list->size;
bv.bv_val = peer_cert_list->data;
x509_cert_get_dn( &bv, &session->peer_der_dn, 1 );
*dnbv = session->peer_der_dn;
}
return 0;
}
#else
static X509 *
tls_get_cert( SSL *s )
{
/* If peer cert was bad, treat as if no cert was given */
if (SSL_get_verify_result(s)) {
/* If we can send an alert, do so */
if (SSL_version(s) != SSL2_VERSION) {
ssl3_send_alert(s,SSL3_AL_WARNING,SSL3_AD_BAD_CERTIFICATE);
}
return NULL;
}
return SSL_get_peer_certificate(s);
}
static int
tls_get_cert_dn( tls_session *session, struct berval *dnbv )
{
X509_NAME *xn;
X509 *x = tls_get_cert( session );
int len;
if ( !x )
return LDAP_INVALID_CREDENTIALS;
xn = X509_get_subject_name(x);
dnbv->bv_len = i2d_X509_NAME( xn, NULL );
dnbv->bv_val = xn->bytes->data;
return 0;
}
#endif /* HAVE_GNUTLS */
int
ldap_pvt_tls_get_peer_dn( void *s, struct berval *dn,
LDAPDN_rewrite_dummy *func, unsigned flags )
{
tls_session *session = s;
struct berval bvdn;
int rc;
rc = tls_get_cert_dn( session, &bvdn );
if ( rc ) return rc;
rc = ldap_X509dn2bv( &bvdn, dn,
(LDAPDN_rewrite_func *)func, flags);
return rc;
}
/* what kind of hostname were we given? */
#define IS_DNS 0
#define IS_IP4 1
#define IS_IP6 2
#ifdef HAVE_GNUTLS
int
ldap_pvt_tls_check_hostname( LDAP *ld, void *s, const char *name_in )
{
tls_session *session = s;
int i, ret;
const gnutls_datum_t *peer_cert_list;
int list_size;
struct berval bv;
char altname[NI_MAXHOST];
size_t altnamesize;
gnutls_x509_crt_t cert;
gnutls_datum_t *x;
const char *name;
char *ptr;
char *domain = NULL;
#ifdef LDAP_PF_INET6
struct in6_addr addr;
#else
struct in_addr addr;
#endif
int n, len1 = 0, len2 = 0;
int ntype = IS_DNS;
time_t now = time(0);
if( ldap_int_hostname &&
( !name_in || !strcasecmp( name_in, "localhost" ) ) )
{
name = ldap_int_hostname;
} else {
name = name_in;
}
peer_cert_list = gnutls_certificate_get_peers( session->session,
&list_size );
if ( !peer_cert_list ) {
Debug( LDAP_DEBUG_ANY,
"TLS: unable to get peer certificate.\n",
0, 0, 0 );
/* If this was a fatal condition, things would have
* aborted long before now.
*/
return LDAP_SUCCESS;
}
ret = gnutls_x509_crt_init( &cert );
if ( ret < 0 )
return LDAP_LOCAL_ERROR;
ret = gnutls_x509_crt_import( cert, peer_cert_list, GNUTLS_X509_FMT_DER );
if ( ret ) {
gnutls_x509_crt_deinit( cert );
return LDAP_LOCAL_ERROR;
}
#ifdef LDAP_PF_INET6
if (name[0] == '[' && strchr(name, ']')) {
char *n2 = ldap_strdup(name+1);
*strchr(n2, ']') = 2;
if (inet_pton(AF_INET6, n2, &addr))
ntype = IS_IP6;
LDAP_FREE(n2);
} else
#endif
if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) {
if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4;
}
if (ntype == IS_DNS) {
len1 = strlen(name);
domain = strchr(name, '.');
if (domain) {
len2 = len1 - (domain-name);
}
}
for ( i=0, ret=0; ret >= 0; i++ ) {
altnamesize = sizeof(altname);
ret = gnutls_x509_crt_get_subject_alt_name( cert, i,
altname, &altnamesize, NULL );
if ( ret < 0 ) break;
/* ignore empty */
if ( altnamesize == 0 ) continue;
if ( ret == GNUTLS_SAN_DNSNAME ) {
if (ntype != IS_DNS) continue;
/* Is this an exact match? */
if ((len1 == altnamesize) && !strncasecmp(name, altname, len1)) {
break;
}
/* Is this a wildcard match? */
if (domain && (altname[0] == '*') && (altname[1] == '.') &&
(len2 == altnamesize-1) && !strncasecmp(domain, &altname[1], len2))
{
break;
}
} else if ( ret == GNUTLS_SAN_IPADDRESS ) {
if (ntype == IS_DNS) continue;
#ifdef LDAP_PF_INET6
if (ntype == IS_IP6 && altnamesize != sizeof(struct in6_addr)) {
continue;
} else
#endif
if (ntype == IS_IP4 && altnamesize != sizeof(struct in_addr)) {
continue;
}
if (!memcmp(altname, &addr, altnamesize)) {
break;
}
}
}
if ( ret >= 0 ) {
ret = LDAP_SUCCESS;
} else {
altnamesize = sizeof(altname);
ret = gnutls_x509_crt_get_dn_by_oid( cert, CN_OID,
0, 0, altname, &altnamesize );
if ( ret < 0 ) {
Debug( LDAP_DEBUG_ANY,
"TLS: unable to get common name from peer certificate.\n",
0, 0, 0 );
ret = LDAP_CONNECT_ERROR;
if ( ld->ld_error ) {
LDAP_FREE( ld->ld_error );
}
ld->ld_error = LDAP_STRDUP(
_("TLS: unable to get CN from peer certificate"));
} else {
ret = LDAP_LOCAL_ERROR;
if ( len1 == altnamesize && strncasecmp(name, altname, altnamesize) == 0 ) {
ret = LDAP_SUCCESS;
} else if (( altname[0] == '*' ) && ( altname[1] == '.' )) {
/* Is this a wildcard match? */
if( domain &&
(len2 == altnamesize-1) && !strncasecmp(domain, &altname[1], len2)) {
ret = LDAP_SUCCESS;
}
}
}
if( ret == LDAP_LOCAL_ERROR ) {
altname[altnamesize] = '\0';
Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
"common name in certificate (%s).\n",
name, altname, 0 );
ret = LDAP_CONNECT_ERROR;
if ( ld->ld_error ) {
LDAP_FREE( ld->ld_error );
}
ld->ld_error = LDAP_STRDUP(
_("TLS: hostname does not match CN in peer certificate"));
}
}
gnutls_x509_crt_deinit( cert );
return ret;
}
#else /* !HAVE_GNUTLS */
int
ldap_pvt_tls_check_hostname( LDAP *ld, void *s, const char *name_in )
{
int i, ret = LDAP_LOCAL_ERROR;
X509 *x;
const char *name;
char *ptr;
int ntype = IS_DNS;
#ifdef LDAP_PF_INET6
struct in6_addr addr;
#else
struct in_addr addr;
#endif
if( ldap_int_hostname &&
( !name_in || !strcasecmp( name_in, "localhost" ) ) )
{
name = ldap_int_hostname;
} else {
name = name_in;
}
x = tls_get_cert((SSL *)s);
if (!x) {
Debug( LDAP_DEBUG_ANY,
"TLS: unable to get peer certificate.\n",
0, 0, 0 );
/* If this was a fatal condition, things would have
* aborted long before now.
*/
return LDAP_SUCCESS;
}
#ifdef LDAP_PF_INET6
if (name[0] == '[' && strchr(name, ']')) {
char *n2 = ldap_strdup(name+1);
*strchr(n2, ']') = 2;
if (inet_pton(AF_INET6, n2, &addr))
ntype = IS_IP6;
LDAP_FREE(n2);
} else
#endif
if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) {
if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4;
}
i = X509_get_ext_by_NID(x, NID_subject_alt_name, -1);
if (i >= 0) {
X509_EXTENSION *ex;
STACK_OF(GENERAL_NAME) *alt;
ex = X509_get_ext(x, i);
alt = X509V3_EXT_d2i(ex);
if (alt) {
int n, len1 = 0, len2 = 0;
char *domain = NULL;
GENERAL_NAME *gn;
if (ntype == IS_DNS) {
len1 = strlen(name);
domain = strchr(name, '.');
if (domain) {
len2 = len1 - (domain-name);
}
}
n = sk_GENERAL_NAME_num(alt);
for (i=0; i<n; i++) {
char *sn;
int sl;
gn = sk_GENERAL_NAME_value(alt, i);
if (gn->type == GEN_DNS) {
if (ntype != IS_DNS) continue;
sn = (char *) ASN1_STRING_data(gn->d.ia5);
sl = ASN1_STRING_length(gn->d.ia5);
/* ignore empty */
if (sl == 0) continue;
/* Is this an exact match? */
if ((len1 == sl) && !strncasecmp(name, sn, len1)) {
break;
}
/* Is this a wildcard match? */
if (domain && (sn[0] == '*') && (sn[1] == '.') &&
(len2 == sl-1) && !strncasecmp(domain, &sn[1], len2))
{
break;
}
} else if (gn->type == GEN_IPADD) {
if (ntype == IS_DNS) continue;
sn = (char *) ASN1_STRING_data(gn->d.ia5);
sl = ASN1_STRING_length(gn->d.ia5);
#ifdef LDAP_PF_INET6
if (ntype == IS_IP6 && sl != sizeof(struct in6_addr)) {
continue;
} else
#endif
if (ntype == IS_IP4 && sl != sizeof(struct in_addr)) {
continue;
}
if (!memcmp(sn, &addr, sl)) {
break;
}
}
}
GENERAL_NAMES_free(alt);
if (i < n) { /* Found a match */
ret = LDAP_SUCCESS;
}
}
}
if (ret != LDAP_SUCCESS) {
X509_NAME *xn;
char buf[2048];
buf[0] = '\0';
xn = X509_get_subject_name(x);
if( X509_NAME_get_text_by_NID( xn, NID_commonName,
buf, sizeof(buf)) == -1)
{
Debug( LDAP_DEBUG_ANY,
"TLS: unable to get common name from peer certificate.\n",
0, 0, 0 );
ret = LDAP_CONNECT_ERROR;
if ( ld->ld_error ) {
LDAP_FREE( ld->ld_error );
}
ld->ld_error = LDAP_STRDUP(
_("TLS: unable to get CN from peer certificate"));
} else if (strcasecmp(name, buf) == 0 ) {
ret = LDAP_SUCCESS;
} else if (( buf[0] == '*' ) && ( buf[1] == '.' )) {
char *domain = strchr(name, '.');
if( domain ) {
size_t dlen = 0;
size_t sl;
sl = strlen(name);
dlen = sl - (domain-name);
sl = strlen(buf);
/* Is this a wildcard match? */
if ((dlen == sl-1) && !strncasecmp(domain, &buf[1], dlen)) {
ret = LDAP_SUCCESS;
}
}
}
if( ret == LDAP_LOCAL_ERROR ) {
Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
"common name in certificate (%s).\n",
name, buf, 0 );
ret = LDAP_CONNECT_ERROR;
if ( ld->ld_error ) {
LDAP_FREE( ld->ld_error );
}
ld->ld_error = LDAP_STRDUP(
_("TLS: hostname does not match CN in peer certificate"));
}
}
X509_free(x);
return ret;
}
#endif
int
ldap_int_tls_config( LDAP *ld, int option, const char *arg )
{
int i;
switch( option ) {
case LDAP_OPT_X_TLS_CACERTFILE:
case LDAP_OPT_X_TLS_CACERTDIR:
case LDAP_OPT_X_TLS_CERTFILE:
case LDAP_OPT_X_TLS_KEYFILE:
case LDAP_OPT_X_TLS_RANDOM_FILE:
case LDAP_OPT_X_TLS_CIPHER_SUITE:
case LDAP_OPT_X_TLS_DHFILE:
#ifdef HAVE_GNUTLS
case LDAP_OPT_X_TLS_CRLFILE:
#endif
return ldap_pvt_tls_set_option( ld, option, (void *) arg );
case LDAP_OPT_X_TLS_REQUIRE_CERT:
case LDAP_OPT_X_TLS:
i = -1;
if ( strcasecmp( arg, "never" ) == 0 ) {
i = LDAP_OPT_X_TLS_NEVER ;
} else if ( strcasecmp( arg, "demand" ) == 0 ) {
i = LDAP_OPT_X_TLS_DEMAND ;
} else if ( strcasecmp( arg, "allow" ) == 0 ) {
i = LDAP_OPT_X_TLS_ALLOW ;
} else if ( strcasecmp( arg, "try" ) == 0 ) {
i = LDAP_OPT_X_TLS_TRY ;
} else if ( ( strcasecmp( arg, "hard" ) == 0 ) ||
( strcasecmp( arg, "on" ) == 0 ) ||
( strcasecmp( arg, "yes" ) == 0) ||
( strcasecmp( arg, "true" ) == 0 ) )
{
i = LDAP_OPT_X_TLS_HARD ;
}
if (i >= 0) {
return ldap_pvt_tls_set_option( ld, option, &i );
}
return -1;
#ifdef HAVE_OPENSSL_CRL
case LDAP_OPT_X_TLS_CRLCHECK:
i = -1;
if ( strcasecmp( arg, "none" ) == 0 ) {
i = LDAP_OPT_X_TLS_CRL_NONE ;
} else if ( strcasecmp( arg, "peer" ) == 0 ) {
i = LDAP_OPT_X_TLS_CRL_PEER ;
} else if ( strcasecmp( arg, "all" ) == 0 ) {
i = LDAP_OPT_X_TLS_CRL_ALL ;
}
if (i >= 0) {
return ldap_pvt_tls_set_option( ld, option, &i );
}
return -1;
#endif
}
return -1;
}
int
ldap_pvt_tls_get_option( LDAP *ld, int option, void *arg )
{
struct ldapoptions *lo;
if( ld != NULL ) {
assert( LDAP_VALID( ld ) );
if( !LDAP_VALID( ld ) ) {
return LDAP_OPT_ERROR;
}
lo = &ld->ld_options;
} else {
/* Get pointer to global option structure */
lo = LDAP_INT_GLOBAL_OPT();
if ( lo == NULL ) {
return LDAP_NO_MEMORY;
}
}
switch( option ) {
case LDAP_OPT_X_TLS:
*(int *)arg = lo->ldo_tls_mode;
break;
case LDAP_OPT_X_TLS_CTX:
*(void **)arg = lo->ldo_tls_ctx;
if ( lo->ldo_tls_ctx ) {
tls_ctx_ref( lo->ldo_tls_ctx );
}
break;
case LDAP_OPT_X_TLS_CACERTFILE:
*(char **)arg = lo->ldo_tls_cacertfile ?
LDAP_STRDUP( lo->ldo_tls_cacertfile ) : NULL;
break;
case LDAP_OPT_X_TLS_CACERTDIR:
*(char **)arg = lo->ldo_tls_cacertdir ?
LDAP_STRDUP( lo->ldo_tls_cacertdir ) : NULL;
break;
case LDAP_OPT_X_TLS_CERTFILE:
*(char **)arg = lo->ldo_tls_certfile ?
LDAP_STRDUP( lo->ldo_tls_certfile ) : NULL;
break;
case LDAP_OPT_X_TLS_KEYFILE:
*(char **)arg = lo->ldo_tls_keyfile ?
LDAP_STRDUP( lo->ldo_tls_keyfile ) : NULL;
break;
case LDAP_OPT_X_TLS_DHFILE:
*(char **)arg = lo->ldo_tls_dhfile ?
LDAP_STRDUP( lo->ldo_tls_dhfile ) : NULL;
break;
#ifdef HAVE_GNUTLS
case LDAP_OPT_X_TLS_CRLFILE:
*(char **)arg = lo->ldo_tls_crlfile ?
LDAP_STRDUP( lo->ldo_tls_crlfile ) : NULL;
break;
#endif
case LDAP_OPT_X_TLS_REQUIRE_CERT:
*(int *)arg = lo->ldo_tls_require_cert;
break;
#ifdef HAVE_OPENSSL_CRL
case LDAP_OPT_X_TLS_CRLCHECK:
*(int *)arg = lo->ldo_tls_crlcheck;
break;
#endif
case LDAP_OPT_X_TLS_CIPHER_SUITE:
*(char **)arg = lo->ldo_tls_ciphersuite ?
LDAP_STRDUP( lo->ldo_tls_ciphersuite ) : NULL;
break;
case LDAP_OPT_X_TLS_RANDOM_FILE:
#ifdef HAVE_OPENSSL
*(char **)arg = tls_opt_randfile ?
LDAP_STRDUP( tls_opt_randfile ) : NULL;
#else
*(char **)arg = NULL;
#endif
break;
case LDAP_OPT_X_TLS_SSL_CTX: {
void *retval = 0;
if ( ld != NULL ) {
LDAPConn *conn = ld->ld_defconn;
if ( conn != NULL ) {
Sockbuf *sb = conn->lconn_sb;
retval = ldap_pvt_tls_sb_ctx( sb );
}
}
*(void **)arg = retval;
break;
}
case LDAP_OPT_X_TLS_CONNECT_CB:
*(LDAP_TLS_CONNECT_CB **)arg = lo->ldo_tls_connect_cb;
break;
case LDAP_OPT_X_TLS_CONNECT_ARG:
*(void **)arg = lo->ldo_tls_connect_arg;
break;
default:
return -1;
}
return 0;
}
int
ldap_pvt_tls_set_option( LDAP *ld, int option, void *arg )
{
struct ldapoptions *lo;
if( ld != NULL ) {
assert( LDAP_VALID( ld ) );
if( !LDAP_VALID( ld ) ) {
return LDAP_OPT_ERROR;
}
lo = &ld->ld_options;
} else {
/* Get pointer to global option structure */
lo = LDAP_INT_GLOBAL_OPT();
if ( lo == NULL ) {
return LDAP_NO_MEMORY;
}
}
switch( option ) {
case LDAP_OPT_X_TLS:
if ( !arg ) return -1;
switch( *(int *) arg ) {
case LDAP_OPT_X_TLS_NEVER:
case LDAP_OPT_X_TLS_DEMAND:
case LDAP_OPT_X_TLS_ALLOW:
case LDAP_OPT_X_TLS_TRY:
case LDAP_OPT_X_TLS_HARD:
if (lo != NULL) {
lo->ldo_tls_mode = *(int *)arg;
}
return 0;
}
return -1;
case LDAP_OPT_X_TLS_CTX:
if ( lo->ldo_tls_ctx )
ldap_pvt_tls_ctx_free( lo->ldo_tls_ctx );
lo->ldo_tls_ctx = arg;
tls_ctx_ref( lo->ldo_tls_ctx );
return 0;
case LDAP_OPT_X_TLS_CONNECT_CB:
lo->ldo_tls_connect_cb = (LDAP_TLS_CONNECT_CB *)arg;
return 0;
case LDAP_OPT_X_TLS_CONNECT_ARG:
lo->ldo_tls_connect_arg = arg;
return 0;
case LDAP_OPT_X_TLS_CACERTFILE:
if ( lo->ldo_tls_cacertfile ) LDAP_FREE( lo->ldo_tls_cacertfile );
lo->ldo_tls_cacertfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
case LDAP_OPT_X_TLS_CACERTDIR:
if ( lo->ldo_tls_cacertdir ) LDAP_FREE( lo->ldo_tls_cacertdir );
lo->ldo_tls_cacertdir = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
case LDAP_OPT_X_TLS_CERTFILE:
if ( lo->ldo_tls_certfile ) LDAP_FREE( lo->ldo_tls_certfile );
lo->ldo_tls_certfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
case LDAP_OPT_X_TLS_KEYFILE:
if ( lo->ldo_tls_keyfile ) LDAP_FREE( lo->ldo_tls_keyfile );
lo->ldo_tls_keyfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
case LDAP_OPT_X_TLS_DHFILE:
if ( lo->ldo_tls_dhfile ) LDAP_FREE( lo->ldo_tls_dhfile );
lo->ldo_tls_dhfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
#ifdef HAVE_GNUTLS
case LDAP_OPT_X_TLS_CRLFILE:
if ( lo->ldo_tls_crlfile ) LDAP_FREE( lo->ldo_tls_crlfile );
lo->ldo_tls_crlfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
#endif
case LDAP_OPT_X_TLS_REQUIRE_CERT:
if ( !arg ) return -1;
switch( *(int *) arg ) {
case LDAP_OPT_X_TLS_NEVER:
case LDAP_OPT_X_TLS_DEMAND:
case LDAP_OPT_X_TLS_ALLOW:
case LDAP_OPT_X_TLS_TRY:
case LDAP_OPT_X_TLS_HARD:
lo->ldo_tls_require_cert = * (int *) arg;
return 0;
}
return -1;
#ifdef HAVE_OPENSSL_CRL
case LDAP_OPT_X_TLS_CRLCHECK:
if ( !arg ) return -1;
switch( *(int *) arg ) {
case LDAP_OPT_X_TLS_CRL_NONE:
case LDAP_OPT_X_TLS_CRL_PEER:
case LDAP_OPT_X_TLS_CRL_ALL:
lo->ldo_tls_crlcheck = * (int *) arg;
return 0;
}
return -1;
#endif
case LDAP_OPT_X_TLS_CIPHER_SUITE:
if ( lo->ldo_tls_ciphersuite ) LDAP_FREE( lo->ldo_tls_ciphersuite );
lo->ldo_tls_ciphersuite = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
case LDAP_OPT_X_TLS_RANDOM_FILE:
if ( ld != NULL )
return -1;
#ifdef HAVE_OPENSSL
if (tls_opt_randfile ) LDAP_FREE (tls_opt_randfile );
tls_opt_randfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
#endif
break;
case LDAP_OPT_X_TLS_NEWCTX:
if ( !arg ) return -1;
if ( lo->ldo_tls_ctx )
ldap_pvt_tls_ctx_free( lo->ldo_tls_ctx );
lo->ldo_tls_ctx = NULL;
return ldap_int_tls_init_ctx( lo, *(int *)arg );
default:
return -1;
}
return 0;
}
int
ldap_int_tls_start ( LDAP *ld, LDAPConn *conn, LDAPURLDesc *srv )
{
Sockbuf *sb = conn->lconn_sb;
char *host;
void *ssl;
if( srv ) {
host = srv->lud_host;
} else {
host = conn->lconn_server->lud_host;
}
/* avoid NULL host */
if( host == NULL ) {
host = "localhost";
}
(void) ldap_pvt_tls_init();
/*
* Fortunately, the lib uses blocking io...
*/
if ( ldap_int_tls_connect( ld, conn ) < 0 ) {
ld->ld_errno = LDAP_CONNECT_ERROR;
return (ld->ld_errno);
}
ssl = ldap_pvt_tls_sb_ctx( sb );
assert( ssl != NULL );
/*
* compare host with name(s) in certificate
*/
if (ld->ld_options.ldo_tls_require_cert != LDAP_OPT_X_TLS_NEVER) {
ld->ld_errno = ldap_pvt_tls_check_hostname( ld, ssl, host );
if (ld->ld_errno != LDAP_SUCCESS) {
return ld->ld_errno;
}
}
return LDAP_SUCCESS;
}
#ifdef HAVE_OPENSSL
/* Derived from openssl/apps/s_cb.c */
static void
tls_info_cb( const SSL *ssl, int where, int ret )
{
int w;
char *op;
char *state = (char *) SSL_state_string_long( (SSL *)ssl );
w = where & ~SSL_ST_MASK;
if ( w & SSL_ST_CONNECT ) {
op = "SSL_connect";
} else if ( w & SSL_ST_ACCEPT ) {
op = "SSL_accept";
} else {
op = "undefined";
}
#ifdef HAVE_EBCDIC
if ( state ) {
state = LDAP_STRDUP( state );
__etoa( state );
}
#endif
if ( where & SSL_CB_LOOP ) {
Debug( LDAP_DEBUG_TRACE,
"TLS trace: %s:%s\n",
op, state, 0 );
} else if ( where & SSL_CB_ALERT ) {
char *atype = (char *) SSL_alert_type_string_long( ret );
char *adesc = (char *) SSL_alert_desc_string_long( ret );
op = ( where & SSL_CB_READ ) ? "read" : "write";
#ifdef HAVE_EBCDIC
if ( atype ) {
atype = LDAP_STRDUP( atype );
__etoa( atype );
}
if ( adesc ) {
adesc = LDAP_STRDUP( adesc );
__etoa( adesc );
}
#endif
Debug( LDAP_DEBUG_TRACE,
"TLS trace: SSL3 alert %s:%s:%s\n",
op, atype, adesc );
#ifdef HAVE_EBCDIC
if ( atype ) LDAP_FREE( atype );
if ( adesc ) LDAP_FREE( adesc );
#endif
} else if ( where & SSL_CB_EXIT ) {
if ( ret == 0 ) {
Debug( LDAP_DEBUG_TRACE,
"TLS trace: %s:failed in %s\n",
op, state, 0 );
} else if ( ret < 0 ) {
Debug( LDAP_DEBUG_TRACE,
"TLS trace: %s:error in %s\n",
op, state, 0 );
}
}
#ifdef HAVE_EBCDIC
if ( state ) LDAP_FREE( state );
#endif
}
static int
tls_verify_cb( int ok, X509_STORE_CTX *ctx )
{
X509 *cert;
int errnum;
int errdepth;
X509_NAME *subject;
X509_NAME *issuer;
char *sname;
char *iname;
char *certerr = NULL;
cert = X509_STORE_CTX_get_current_cert( ctx );
errnum = X509_STORE_CTX_get_error( ctx );
errdepth = X509_STORE_CTX_get_error_depth( ctx );
/*
* X509_get_*_name return pointers to the internal copies of
* those things requested. So do not free them.
*/
subject = X509_get_subject_name( cert );
issuer = X509_get_issuer_name( cert );
/* X509_NAME_oneline, if passed a NULL buf, allocate memomry */
sname = X509_NAME_oneline( subject, NULL, 0 );
iname = X509_NAME_oneline( issuer, NULL, 0 );
if ( !ok ) certerr = (char *)X509_verify_cert_error_string( errnum );
#ifdef HAVE_EBCDIC
if ( sname ) __etoa( sname );
if ( iname ) __etoa( iname );
if ( certerr ) {
certerr = LDAP_STRDUP( certerr );
__etoa( certerr );
}
#endif
Debug( LDAP_DEBUG_TRACE,
"TLS certificate verification: depth: %d, err: %d, subject: %s,",
errdepth, errnum,
sname ? sname : "-unknown-" );
Debug( LDAP_DEBUG_TRACE, " issuer: %s\n", iname ? iname : "-unknown-", 0, 0 );
if ( !ok ) {
Debug( LDAP_DEBUG_ANY,
"TLS certificate verification: Error, %s\n",
certerr, 0, 0 );
}
if ( sname )
CRYPTO_free ( sname );
if ( iname )
CRYPTO_free ( iname );
#ifdef HAVE_EBCDIC
if ( certerr ) LDAP_FREE( certerr );
#endif
return ok;
}
static int
tls_verify_ok( int ok, X509_STORE_CTX *ctx )
{
(void) tls_verify_cb( ok, ctx );
return 1;
}
/* Inspired by ERR_print_errors in OpenSSL */
static void
tls_report_error( void )
{
unsigned long l;
char buf[200];
const char *file;
int line;
while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
ERR_error_string_n( l, buf, sizeof( buf ) );
#ifdef HAVE_EBCDIC
if ( file ) {
file = LDAP_STRDUP( file );
__etoa( (char *)file );
}
__etoa( buf );
#endif
Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
buf, file, line );
#ifdef HAVE_EBCDIC
if ( file ) LDAP_FREE( (void *)file );
#endif
}
}
static RSA *
tls_tmp_rsa_cb( SSL *ssl, int is_export, int key_length )
{
RSA *tmp_rsa;
/* FIXME: Pregenerate the key on startup */
/* FIXME: Who frees the key? */
tmp_rsa = RSA_generate_key( key_length, RSA_F4, NULL, NULL );
if ( !tmp_rsa ) {
Debug( LDAP_DEBUG_ANY,
"TLS: Failed to generate temporary %d-bit %s RSA key\n",
key_length, is_export ? "export" : "domestic", 0 );
return NULL;
}
return tmp_rsa;
}
static int
tls_seed_PRNG( const char *randfile )
{
#ifndef URANDOM_DEVICE
/* no /dev/urandom (or equiv) */
long total=0;
char buffer[MAXPATHLEN];
if (randfile == NULL) {
/* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd.
* If $HOME is not set or buffer too small to hold the pathname,
* an error occurs. - From RAND_file_name() man page.
* The fact is that when $HOME is NULL, .rnd is used.
*/
randfile = RAND_file_name( buffer, sizeof( buffer ) );
} else if (RAND_egd(randfile) > 0) {
/* EGD socket */
return 0;
}
if (randfile == NULL) {
Debug( LDAP_DEBUG_ANY,
"TLS: Use configuration file or $RANDFILE to define seed PRNG\n",
0, 0, 0);
return -1;
}
total = RAND_load_file(randfile, -1);
if (RAND_status() == 0) {
Debug( LDAP_DEBUG_ANY,
"TLS: PRNG not been seeded with enough data\n",
0, 0, 0);
return -1;
}
/* assume if there was enough bits to seed that it's okay
* to write derived bits to the file
*/
RAND_write_file(randfile);
#endif
return 0;
}
struct dhinfo {
int keylength;
const char *pem;
size_t size;
};
/* From the OpenSSL 0.9.7 distro */
static const char dhpem512[] =
"-----BEGIN DH PARAMETERS-----\n\
MEYCQQDaWDwW2YUiidDkr3VvTMqS3UvlM7gE+w/tlO+cikQD7VdGUNNpmdsp13Yn\n\
a6LT1BLiGPTdHghM9tgAPnxHdOgzAgEC\n\
-----END DH PARAMETERS-----\n";
static const char dhpem1024[] =
"-----BEGIN DH PARAMETERS-----\n\
MIGHAoGBAJf2QmHKtQXdKCjhPx1ottPb0PMTBH9A6FbaWMsTuKG/K3g6TG1Z1fkq\n\
/Gz/PWk/eLI9TzFgqVAuPvr3q14a1aZeVUMTgo2oO5/y2UHe6VaJ+trqCTat3xlx\n\
/mNbIK9HA2RgPC3gWfVLZQrY+gz3ASHHR5nXWHEyvpuZm7m3h+irAgEC\n\
-----END DH PARAMETERS-----\n";
static const char dhpem2048[] =
"-----BEGIN DH PARAMETERS-----\n\
MIIBCAKCAQEA7ZKJNYJFVcs7+6J2WmkEYb8h86tT0s0h2v94GRFS8Q7B4lW9aG9o\n\
AFO5Imov5Jo0H2XMWTKKvbHbSe3fpxJmw/0hBHAY8H/W91hRGXKCeyKpNBgdL8sh\n\
z22SrkO2qCnHJ6PLAMXy5fsKpFmFor2tRfCzrfnggTXu2YOzzK7q62bmqVdmufEo\n\
pT8igNcLpvZxk5uBDvhakObMym9mX3rAEBoe8PwttggMYiiw7NuJKO4MqD1llGkW\n\
aVM8U2ATsCun1IKHrRxynkE1/MJ86VHeYYX8GZt2YA8z+GuzylIOKcMH6JAWzMwA\n\
Gbatw6QwizOhr9iMjZ0B26TE3X8LvW84wwIBAg==\n\
-----END DH PARAMETERS-----\n";
static const char dhpem4096[] =
"-----BEGIN DH PARAMETERS-----\n\
MIICCAKCAgEA/urRnb6vkPYc/KEGXWnbCIOaKitq7ySIq9dTH7s+Ri59zs77zty7\n\
vfVlSe6VFTBWgYjD2XKUFmtqq6CqXMhVX5ElUDoYDpAyTH85xqNFLzFC7nKrff/H\n\
TFKNttp22cZE9V0IPpzedPfnQkE7aUdmF9JnDyv21Z/818O93u1B4r0szdnmEvEF\n\
bKuIxEHX+bp0ZR7RqE1AeifXGJX3d6tsd2PMAObxwwsv55RGkn50vHO4QxtTARr1\n\
rRUV5j3B3oPMgC7Offxx+98Xn45B1/G0Prp11anDsR1PGwtaCYipqsvMwQUSJtyE\n\
EOQWk+yFkeMe4vWv367eEi0Sd/wnC+TSXBE3pYvpYerJ8n1MceI5GQTdarJ77OW9\n\
bGTHmxRsLSCM1jpLdPja5jjb4siAa6EHc4qN9c/iFKS3PQPJEnX7pXKBRs5f7AF3\n\
W3RIGt+G9IVNZfXaS7Z/iCpgzgvKCs0VeqN38QsJGtC1aIkwOeyjPNy2G6jJ4yqH\n\
ovXYt/0mc00vCWeSNS1wren0pR2EiLxX0ypjjgsU1mk/Z3b/+zVf7fZSIB+nDLjb\n\
NPtUlJCVGnAeBK1J1nG3TQicqowOXoM6ISkdaXj5GPJdXHab2+S7cqhKGv5qC7rR\n\
jT6sx7RUr0CNTxzLI7muV2/a4tGmj0PSdXQdsZ7tw7gbXlaWT1+MM2MCAQI=\n\
-----END DH PARAMETERS-----\n";
static const struct dhinfo dhpem[] = {
{ 512, dhpem512, sizeof(dhpem512) },
{ 1024, dhpem1024, sizeof(dhpem1024) },
{ 2048, dhpem2048, sizeof(dhpem2048) },
{ 4096, dhpem4096, sizeof(dhpem4096) },
{ 0, NULL, 0 }
};
static DH *
tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length )
{
struct dhplist *p = NULL;
BIO *b = NULL;
DH *dh = NULL;
int i;
/* Do we have params of this length already? */
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &tls_def_ctx_mutex );
#endif
for ( p = dhparams; p; p=p->next ) {
if ( p->keylength == key_length ) {
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex );
#endif
return p->param;
}
}
/* No - check for hardcoded params */
for (i=0; dhpem[i].keylength; i++) {
if ( dhpem[i].keylength == key_length ) {
b = BIO_new_mem_buf( (char *)dhpem[i].pem, dhpem[i].size );
break;
}
}
if ( b ) {
dh = PEM_read_bio_DHparams( b, NULL, NULL, NULL );
BIO_free( b );
}
/* Generating on the fly is expensive/slow... */
if ( !dh ) {
dh = DH_generate_parameters( key_length, DH_GENERATOR_2, NULL, NULL );
}
if ( dh ) {
p = LDAP_MALLOC( sizeof(struct dhplist) );
if ( p != NULL ) {
p->keylength = key_length;
p->param = dh;
p->next = dhparams;
dhparams = p;
}
}
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex );
#endif
return dh;
}
#endif
#endif /* HAVE_OPENSSL */
void *
ldap_pvt_tls_sb_ctx( Sockbuf *sb )
{
#ifdef HAVE_TLS
void *p;
if (HAS_TLS( sb )) {
ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&p );
return p;
}
#endif
return NULL;
}
int
ldap_pvt_tls_get_strength( void *s )
{
#ifdef HAVE_OPENSSL
SSL_CIPHER *c;
c = SSL_get_current_cipher((SSL *)s);
return SSL_CIPHER_get_bits(c, NULL);
#elif defined(HAVE_GNUTLS)
tls_session *session = s;
gnutls_cipher_algorithm_t c;
c = gnutls_cipher_get( session->session );
return gnutls_cipher_get_key_size( c );
#else
return 0;
#endif
}
int
ldap_pvt_tls_get_my_dn( void *s, struct berval *dn, LDAPDN_rewrite_dummy *func, unsigned flags )
{
#ifdef HAVE_TLS
struct berval der_dn;
int rc;
#ifdef HAVE_OPENSSL
X509 *x;
X509_NAME *xn;
x = SSL_get_certificate((SSL *)s);
if (!x) return LDAP_INVALID_CREDENTIALS;
xn = X509_get_subject_name(x);
der_dn.bv_len = i2d_X509_NAME( xn, NULL );
der_dn.bv_val = xn->bytes->data;
#elif defined(HAVE_GNUTLS)
tls_session *session = s;
const gnutls_datum_t *x;
struct berval bv;
x = gnutls_certificate_get_ours( session->session );
if (!x) return LDAP_INVALID_CREDENTIALS;
bv.bv_val = x->data;
bv.bv_len = x->size;
x509_cert_get_dn( &bv, &der_dn, 1 );
#endif
rc = ldap_X509dn2bv(&der_dn, dn, (LDAPDN_rewrite_func *)func, flags );
return rc;
#else /* !HAVE_TLS */
return LDAP_NOT_SUPPORTED;
#endif
}
int
ldap_start_tls( LDAP *ld,
LDAPControl **serverctrls,
LDAPControl **clientctrls,
int *msgidp )
{
return ldap_extended_operation( ld, LDAP_EXOP_START_TLS,
NULL, serverctrls, clientctrls, msgidp );
}
int
ldap_install_tls( LDAP *ld )
{
#ifndef HAVE_TLS
return LDAP_NOT_SUPPORTED;
#else
if ( ldap_tls_inplace( ld ) ) {
return LDAP_LOCAL_ERROR;
}
return ldap_int_tls_start( ld, ld->ld_defconn, NULL );
#endif
}
int
ldap_start_tls_s ( LDAP *ld,
LDAPControl **serverctrls,
LDAPControl **clientctrls )
{
#ifndef HAVE_TLS
return LDAP_NOT_SUPPORTED;
#else
int rc;
char *rspoid = NULL;
struct berval *rspdata = NULL;
/* XXYYZ: this initiates operation only on default connection! */
if ( ldap_tls_inplace( ld ) ) {
return LDAP_LOCAL_ERROR;
}
rc = ldap_extended_operation_s( ld, LDAP_EXOP_START_TLS,
NULL, serverctrls, clientctrls, &rspoid, &rspdata );
if ( rspoid != NULL ) {
LDAP_FREE(rspoid);
}
if ( rspdata != NULL ) {
ber_bvfree( rspdata );
}
if ( rc == LDAP_SUCCESS ) {
rc = ldap_int_tls_start( ld, ld->ld_defconn, NULL );
}
return rc;
#endif
}
/* These tags probably all belong in lber.h, but they're
* not normally encountered when processing LDAP, so maybe
* they belong somewhere else instead.
*/
#define LBER_TAG_OID ((ber_tag_t) 0x06UL)
/* Tags for string types used in a DirectoryString.
*
* Note that IA5string is not one of the defined choices for
* DirectoryString in X.520, but it gets used for email AVAs.
*/
#define LBER_TAG_UTF8 ((ber_tag_t) 0x0cUL)
#define LBER_TAG_PRINTABLE ((ber_tag_t) 0x13UL)
#define LBER_TAG_TELETEX ((ber_tag_t) 0x14UL)
#define LBER_TAG_IA5 ((ber_tag_t) 0x16UL)
#define LBER_TAG_UNIVERSAL ((ber_tag_t) 0x1cUL)
#define LBER_TAG_BMP ((ber_tag_t) 0x1eUL)
static oid_name *
find_oid( struct berval *oid )
{
int i;
for ( i=0; !BER_BVISNULL( &oids[i].oid ); i++ ) {
if ( oids[i].oid.bv_len != oid->bv_len ) continue;
if ( !strcmp( oids[i].oid.bv_val, oid->bv_val ))
return &oids[i];
}
return NULL;
}
/* Convert a structured DN from an X.509 certificate into an LDAPV3 DN.
* x509_name must be raw DER. If func is non-NULL, the
* constructed DN will use numeric OIDs to identify attributeTypes,
* and the func() will be invoked to rewrite the DN with the given
* flags.
*
* Otherwise the DN will use shortNames from a hardcoded table.
*/
int
ldap_X509dn2bv( void *x509_name, struct berval *bv, LDAPDN_rewrite_func *func,
unsigned flags )
{
LDAPDN newDN;
LDAPRDN newRDN;
LDAPAVA *newAVA, *baseAVA;
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
char oids[8192], *oidptr = oids, *oidbuf = NULL;
void *ptrs[2048];
char *dn_end, *rdn_end;
int i, navas, nrdns, rc = LDAP_SUCCESS;
size_t dnsize, oidrem = sizeof(oids), oidsize = 0;
int csize;
ber_tag_t tag;
ber_len_t len;
oid_name *oidname;
struct berval Oid, Val, oid2, *in = x509_name;
assert( bv != NULL );
bv->bv_len = 0;
bv->bv_val = NULL;
navas = 0;
nrdns = 0;
/* A DN is a SEQUENCE of RDNs. An RDN is a SET of AVAs.
* An AVA is a SEQUENCE of attr and value.
* Count the number of AVAs and RDNs
*/
ber_init2( ber, in, LBER_USE_DER );
tag = ber_peek_tag( ber, &len );
if ( tag != LBER_SEQUENCE )
return LDAP_DECODING_ERROR;
for ( tag = ber_first_element( ber, &len, &dn_end );
tag == LBER_SET;
tag = ber_next_element( ber, &len, dn_end )) {
nrdns++;
for ( tag = ber_first_element( ber, &len, &rdn_end );
tag == LBER_SEQUENCE;
tag = ber_next_element( ber, &len, rdn_end )) {
tag = ber_skip_tag( ber, &len );
ber_skip_data( ber, len );
navas++;
}
}
/* Allocate the DN/RDN/AVA stuff as a single block */
dnsize = sizeof(LDAPRDN) * (nrdns+1);
dnsize += sizeof(LDAPAVA *) * (navas+nrdns);
dnsize += sizeof(LDAPAVA) * navas;
if (dnsize > sizeof(ptrs)) {
newDN = (LDAPDN)LDAP_MALLOC( dnsize );
if ( newDN == NULL )
return LDAP_NO_MEMORY;
} else {
newDN = (LDAPDN)(char *)ptrs;
}
newDN[nrdns] = NULL;
newRDN = (LDAPRDN)(newDN + nrdns+1);
newAVA = (LDAPAVA *)(newRDN + navas + nrdns);
baseAVA = newAVA;
/* Rewind and start extracting */
ber_rewind( ber );
tag = ber_first_element( ber, &len, &dn_end );
for ( i = nrdns - 1; i >= 0; i-- ) {
newDN[i] = newRDN;
for ( tag = ber_first_element( ber, &len, &rdn_end );
tag == LBER_SEQUENCE;
tag = ber_next_element( ber, &len, rdn_end )) {
*newRDN++ = newAVA;
tag = ber_skip_tag( ber, &len );
tag = ber_get_stringbv( ber, &Oid, LBER_BV_NOTERM );
if ( tag != LBER_TAG_OID ) {
rc = LDAP_DECODING_ERROR;
goto nomem;
}
oid2.bv_val = oidptr;
oid2.bv_len = oidrem;
ber_decode_oid( &Oid, &oid2 );
oidname = find_oid( &oid2 );
if ( !oidname ) {
newAVA->la_attr = oid2;
oidptr += oid2.bv_len + 1;
oidrem -= oid2.bv_len + 1;
/* Running out of OID buffer space? */
if (oidrem < 128) {
if ( oidsize == 0 ) {
oidsize = sizeof(oids) * 2;
oidrem = oidsize;
oidbuf = LDAP_MALLOC( oidsize );
if ( oidbuf == NULL ) goto nomem;
oidptr = oidbuf;
} else {
char *old = oidbuf;
oidbuf = LDAP_REALLOC( oidbuf, oidsize*2 );
if ( oidbuf == NULL ) goto nomem;
/* Buffer moved! Fix AVA pointers */
if ( old != oidbuf ) {
LDAPAVA *a;
long dif = oidbuf - old;
for (a=baseAVA; a<=newAVA; a++){
if (a->la_attr.bv_val >= old &&
a->la_attr.bv_val <= (old + oidsize))
a->la_attr.bv_val += dif;
}
}
oidptr = oidbuf + oidsize - oidrem;
oidrem += oidsize;
oidsize *= 2;
}
}
} else {
if ( func ) {
newAVA->la_attr = oidname->oid;
} else {
newAVA->la_attr = oidname->name;
}
}
tag = ber_get_stringbv( ber, &Val, LBER_BV_NOTERM );
switch(tag) {
case LBER_TAG_UNIVERSAL:
/* This uses 32-bit ISO 10646-1 */
csize = 4; goto to_utf8;
case LBER_TAG_BMP:
/* This uses 16-bit ISO 10646-1 */
csize = 2; goto to_utf8;
case LBER_TAG_TELETEX:
/* This uses 8-bit, assume ISO 8859-1 */
csize = 1;
to_utf8: rc = ldap_ucs_to_utf8s( &Val, csize, &newAVA->la_value );
newAVA->la_flags |= LDAP_AVA_FREE_VALUE;
if (rc != LDAP_SUCCESS) goto nomem;
newAVA->la_flags = LDAP_AVA_NONPRINTABLE;
break;
case LBER_TAG_UTF8:
newAVA->la_flags = LDAP_AVA_NONPRINTABLE;
/* This is already in UTF-8 encoding */
case LBER_TAG_IA5:
case LBER_TAG_PRINTABLE:
/* These are always 7-bit strings */
newAVA->la_value = Val;
default:
;
}
newAVA->la_private = NULL;
newAVA->la_flags = LDAP_AVA_STRING;
newAVA++;
}
*newRDN++ = NULL;
tag = ber_next_element( ber, &len, dn_end );
}
if ( func ) {
rc = func( newDN, flags, NULL );
if ( rc != LDAP_SUCCESS )
goto nomem;
}
rc = ldap_dn2bv_x( newDN, bv, LDAP_DN_FORMAT_LDAPV3, NULL );
nomem:
for (;baseAVA < newAVA; baseAVA++) {
if (baseAVA->la_flags & LDAP_AVA_FREE_ATTR)
LDAP_FREE( baseAVA->la_attr.bv_val );
if (baseAVA->la_flags & LDAP_AVA_FREE_VALUE)
LDAP_FREE( baseAVA->la_value.bv_val );
}
if ( oidsize != 0 )
LDAP_FREE( oidbuf );
if ( newDN != (LDAPDN)(char *) ptrs )
LDAP_FREE( newDN );
return rc;
}
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