tls_o.c 38.9 KB
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/* tls_o.c - Handle tls/ssl using OpenSSL */
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/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
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 * Copyright 2008-2021 The OpenLDAP Foundation.
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 * 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: Rewritten by Howard Chu
 */

#include "portable.h"

#ifdef HAVE_OPENSSL

#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"
#include "ldap-tls.h"

#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>
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#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/dh.h>
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#endif

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#if OPENSSL_VERSION_NUMBER >= 0x10100000
#define ASN1_STRING_data(x)	ASN1_STRING_get0_data(x)
#endif

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typedef SSL_CTX tlso_ctx;
typedef SSL tlso_session;
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static BIO_METHOD * tlso_bio_method = NULL;
static BIO_METHOD * tlso_bio_setup( void );

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static int  tlso_opt_trace = 1;

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static void tlso_report_error( char *errmsg );
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static void tlso_info_cb( const SSL *ssl, int where, int ret );
static int tlso_verify_cb( int ok, X509_STORE_CTX *ctx );
static int tlso_verify_ok( int ok, X509_STORE_CTX *ctx );
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static int tlso_seed_PRNG( const char *randfile );
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#if OPENSSL_VERSION_NUMBER < 0x10100000
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/*
 * OpenSSL 1.1 API and later has new locking code
*/
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static RSA * tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );

#ifdef LDAP_R_COMPILE
/*
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 * provide mutexes for the OpenSSL library.
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 */
static ldap_pvt_thread_mutex_t	tlso_mutexes[CRYPTO_NUM_LOCKS];

static void tlso_locking_cb( int mode, int type, const char *file, int line )
{
	if ( mode & CRYPTO_LOCK ) {
		ldap_pvt_thread_mutex_lock( &tlso_mutexes[type] );
	} else {
		ldap_pvt_thread_mutex_unlock( &tlso_mutexes[type] );
	}
}

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#if OPENSSL_VERSION_NUMBER >= 0x0909000
static void tlso_thread_self( CRYPTO_THREADID *id )
{
	CRYPTO_THREADID_set_pointer( id, (void *)ldap_pvt_thread_self() );
}
#define CRYPTO_set_id_callback(foo)	CRYPTO_THREADID_set_callback(foo)
#else
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static unsigned long tlso_thread_self( void )
{
	/* FIXME: CRYPTO_set_id_callback only works when ldap_pvt_thread_t
	 * is an integral type that fits in an unsigned long
	 */

	/* force an error if the ldap_pvt_thread_t type is too large */
	enum { ok = sizeof( ldap_pvt_thread_t ) <= sizeof( unsigned long ) };
	typedef struct { int dummy: ok ? 1 : -1; } Check[ok ? 1 : -1];

	return (unsigned long) ldap_pvt_thread_self();
}
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#endif
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static void tlso_thr_init( void )
{
	int i;

	for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) {
		ldap_pvt_thread_mutex_init( &tlso_mutexes[i] );
	}
	CRYPTO_set_locking_callback( tlso_locking_cb );
	CRYPTO_set_id_callback( tlso_thread_self );
}
#endif /* LDAP_R_COMPILE */
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#else
#ifdef LDAP_R_COMPILE
static void tlso_thr_init( void ) {}
#endif
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#endif /* OpenSSL 1.1 */
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#if OPENSSL_VERSION_NUMBER < 0x10100000
/*
 * OpenSSL 1.1 API and later makes the BIO method concrete types internal.
 */

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static BIO_METHOD *
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BIO_meth_new( int type, const char *name )
{
	BIO_METHOD *method = LDAP_MALLOC( sizeof(BIO_METHOD) );
	memset( method, 0, sizeof(BIO_METHOD) );

	method->type = type;
	method->name = name;

	return method;
}

static void
BIO_meth_free( BIO_METHOD *meth )
{
	if ( meth == NULL ) {
		return;
	}

	LDAP_FREE( meth );
}

#define BIO_meth_set_write(m, f) (m)->bwrite = (f)
#define BIO_meth_set_read(m, f) (m)->bread = (f)
#define BIO_meth_set_puts(m, f) (m)->bputs = (f)
#define BIO_meth_set_gets(m, f) (m)->bgets = (f)
#define BIO_meth_set_ctrl(m, f) (m)->ctrl = (f)
#define BIO_meth_set_create(m, f) (m)->create = (f)
#define BIO_meth_set_destroy(m, f) (m)->destroy = (f)

#endif /* OpenSSL 1.1 */

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static STACK_OF(X509_NAME) *
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tlso_ca_list( char * bundle, char * dir, X509 *cert )
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{
	STACK_OF(X509_NAME) *ca_list = NULL;

	if ( bundle ) {
		ca_list = SSL_load_client_CA_file( bundle );
	}
	if ( dir ) {
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		char **dirs = ldap_str2charray( dir, CERTPATHSEP );
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		int freeit = 0, i, success = 0;
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		if ( !ca_list ) {
			ca_list = sk_X509_NAME_new_null();
			freeit = 1;
		}
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		for ( i=0; dirs[i]; i++ ) {
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			success += SSL_add_dir_cert_subjects_to_stack( ca_list, dir );
		}
		if ( !success && freeit ) {
			sk_X509_NAME_free( ca_list );
			ca_list = NULL;
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		}
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		ldap_charray_free( dirs );
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	}
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	if ( cert ) {
		X509_NAME *xn = X509_get_subject_name( cert );
		xn = X509_NAME_dup( xn );
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		if ( !ca_list )
			ca_list = sk_X509_NAME_new_null();
		if ( xn && ca_list )
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			sk_X509_NAME_push( ca_list, xn );
	}
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	return ca_list;
}

/*
 * Initialize TLS subsystem. Should be called only once.
 */
static int
tlso_init( void )
{
	struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();   
#ifdef HAVE_EBCDIC
	{
		char *file = LDAP_STRDUP( lo->ldo_tls_randfile );
		if ( file ) __atoe( file );
		(void) tlso_seed_PRNG( file );
		LDAP_FREE( file );
	}
#else
	(void) tlso_seed_PRNG( lo->ldo_tls_randfile );
#endif

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#if OPENSSL_VERSION_NUMBER < 0x10100000
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	SSL_load_error_strings();
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	SSL_library_init();
	OpenSSL_add_all_digests();
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#else
	OPENSSL_init_ssl(0, NULL);
#endif
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	/* FIXME: mod_ssl does this */
	X509V3_add_standard_extensions();

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	tlso_bio_method = tlso_bio_setup();

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	return 0;
}

/*
 * Tear down the TLS subsystem. Should only be called once.
 */
static void
tlso_destroy( void )
{
	struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();   

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	BIO_meth_free( tlso_bio_method );

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#if OPENSSL_VERSION_NUMBER < 0x10100000
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	EVP_cleanup();
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	ERR_remove_thread_state(NULL);
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	ERR_free_strings();
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#endif
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	if ( lo->ldo_tls_randfile ) {
		LDAP_FREE( lo->ldo_tls_randfile );
		lo->ldo_tls_randfile = NULL;
	}
}

static tls_ctx *
tlso_ctx_new( struct ldapoptions *lo )
{
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	return (tls_ctx *) SSL_CTX_new( SSLv23_method() );
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}

static void
tlso_ctx_ref( tls_ctx *ctx )
{
	tlso_ctx *c = (tlso_ctx *)ctx;
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#if OPENSSL_VERSION_NUMBER < 0x10100000
#define	SSL_CTX_up_ref(ctx)	CRYPTO_add( &(ctx->references), 1, CRYPTO_LOCK_SSL_CTX )
#endif
	SSL_CTX_up_ref( c );
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}

static void
tlso_ctx_free ( tls_ctx *ctx )
{
	tlso_ctx *c = (tlso_ctx *)ctx;
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	SSL_CTX_free( c );
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}

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#if OPENSSL_VERSION_NUMBER >= 0x10101000
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static char *
tlso_stecpy( char *dst, const char *src, const char *end )
{
	while ( dst < end && *src )
		*dst++ = *src++;
	if ( dst < end )
		*dst = '\0';
	return dst;
}

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/* OpenSSL 1.1.1 uses a separate API for TLS1.3 ciphersuites.
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 * Try to find any TLS1.3 ciphers in the given list of suites.
 */
static void
tlso_ctx_cipher13( tlso_ctx *ctx, char *suites )
{
	char tls13_suites[1024], *ts = tls13_suites, *te = tls13_suites + sizeof(tls13_suites);
	char *ptr, *colon, *nptr;
	char sname[128];
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	STACK_OF(SSL_CIPHER) *cs;
	SSL *s = SSL_new( ctx );
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	int ret;

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	if ( !s )
		return;

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	*ts = '\0';
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	/* check individual suites in a separate SSL handle before
	 * mucking with the provided ctx. Init it to a known
	 * mostly-empty state.
	 */
	SSL_set_ciphersuites( s, "" );
	SSL_set_cipher_list( s, SSL3_TXT_RSA_NULL_SHA );

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	for ( ptr = suites;; ) {
		colon = strchr( ptr, ':' );
		if ( colon ) {
			int len = colon - ptr;
			if ( len > 63 ) len = 63;
			strncpy( sname, ptr, len );
			sname[len] = '\0';
			nptr = sname;
		} else {
			nptr = ptr;
		}
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		if ( SSL_set_ciphersuites( s, nptr )) {
			cs = SSL_get_ciphers( s );
			if ( cs ) {
				const char *ver = SSL_CIPHER_get_version( sk_SSL_CIPHER_value( cs, 0 ));
				if ( !strncmp( ver, "TLSv", 4 ) && strncmp( ver+4, "1.3", 3 ) >= 0 ) {
					if ( tls13_suites[0] )
						ts = tlso_stecpy( ts, ":", te );
					ts = tlso_stecpy( ts, sname, te );
				}
			}
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		}
		if ( !colon || ts >= te )
			break;
		ptr = colon+1;
	}
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	SSL_free( s );

	/* If no TLS1.3 ciphersuites were specified, leave current settings untouched. */
	if ( tls13_suites[0] )
		SSL_CTX_set_ciphersuites( ctx, tls13_suites );
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}
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#endif /* OpenSSL 1.1.1 */
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/*
 * initialize a new TLS context
 */
static int
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tlso_ctx_init( struct ldapoptions *lo, struct ldaptls *lt, int is_server, char *errmsg )
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{
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	tlso_ctx *ctx = (tlso_ctx *)lo->ldo_tls_ctx;
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	int i;

	if ( is_server ) {
		SSL_CTX_set_session_id_context( ctx,
			(const unsigned char *) "OpenLDAP", sizeof("OpenLDAP")-1 );
	}

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	if ( lo->ldo_tls_protocol_min ) {
		int opt = 0;
		if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL2 ) {
			opt |= SSL_OP_NO_SSLv2;
			SSL_CTX_clear_options( ctx, SSL_OP_NO_SSLv3 );
		}
		if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
			opt |= SSL_OP_NO_SSLv3;
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#ifdef SSL_OP_NO_TLSv1
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		if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_0 )
			opt |= SSL_OP_NO_TLSv1;
#endif
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#ifdef SSL_OP_NO_TLSv1_1
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		if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_1 )
			opt |= SSL_OP_NO_TLSv1_1;
#endif
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#ifdef SSL_OP_NO_TLSv1_2
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		if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_2 )
			opt |= SSL_OP_NO_TLSv1_2;
#endif
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#ifdef SSL_OP_NO_TLSv1_3
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		if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_3 )
			opt |= SSL_OP_NO_TLSv1_3;
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#endif
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		if ( opt )
			SSL_CTX_set_options( ctx, opt );
	}
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	if ( lo->ldo_tls_protocol_max ) {
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		int opt = 0;
#ifdef SSL_OP_NO_TLSv1_3
		if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_3 )
			opt |= SSL_OP_NO_TLSv1_3;
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#endif
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#ifdef SSL_OP_NO_TLSv1_2
		if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_2 )
			opt |= SSL_OP_NO_TLSv1_2;
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#endif
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#ifdef SSL_OP_NO_TLSv1_1
		if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_1 )
			opt |= SSL_OP_NO_TLSv1_1;
#endif
#ifdef SSL_OP_NO_TLSv1
		if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_0 )
			opt |= SSL_OP_NO_TLSv1;
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#endif
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		if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
			opt |= SSL_OP_NO_SSLv3;
		if ( opt )
			SSL_CTX_set_options( ctx, opt );
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	}
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	if ( lo->ldo_tls_ciphersuite ) {
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#if OPENSSL_VERSION_NUMBER >= 0x10101000
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		tlso_ctx_cipher13( ctx, lt->lt_ciphersuite );
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#endif
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		if ( !SSL_CTX_set_cipher_list( ctx, lt->lt_ciphersuite ) )
		{
			Debug1( LDAP_DEBUG_ANY,
				   "TLS: could not set cipher list %s.\n",
				   lo->ldo_tls_ciphersuite );
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			tlso_report_error( errmsg );
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			return -1;
		}
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	}

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	if ( lo->ldo_tls_cacertfile == NULL && lo->ldo_tls_cacertdir == NULL &&
		lo->ldo_tls_cacert.bv_val == NULL ) {
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		if ( !SSL_CTX_set_default_verify_paths( ctx ) ) {
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			Debug0( LDAP_DEBUG_ANY, "TLS: "
				"could not use default certificate paths" );
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			tlso_report_error( errmsg );
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			return -1;
		}
	} else {
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		X509 *cert = NULL;
		if ( lo->ldo_tls_cacert.bv_val ) {
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			const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_cacert.bv_val);
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			cert = d2i_X509( NULL, &pp, lo->ldo_tls_cacert.bv_len );
			X509_STORE *store = SSL_CTX_get_cert_store( ctx );
			if ( !X509_STORE_add_cert( store, cert )) {
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				Debug0( LDAP_DEBUG_ANY, "TLS: "
					"could not use CA certificate" );
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				tlso_report_error( errmsg );
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				return -1;
			}
		}
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		if ( lt->lt_cacertfile || lt->lt_cacertdir ) {
			char **dirs, *dummy = NULL;
			if ( lt->lt_cacertdir ) {
				dirs = ldap_str2charray( lt->lt_cacertdir, CERTPATHSEP );
			} else {
				dirs = &dummy;
			}
			/* Start with the first dir in path */
			if ( !SSL_CTX_load_verify_locations( ctx,
				lt->lt_cacertfile, dirs[0] ) )
			{
				Debug2( LDAP_DEBUG_ANY, "TLS: "
					"could not load verify locations (file:`%s',dir:`%s').\n",
					lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
					dirs[0] ? dirs[0] : "" );
				tlso_report_error( errmsg );
				if ( dirs != &dummy )
					ldap_charray_free( dirs );
				return -1;
			}
			/* Then additional dirs, if any */
			if ( dirs != &dummy ) {
				if ( dirs[1] ) {
					int i;
					X509_STORE *store = SSL_CTX_get_cert_store( ctx );
					X509_LOOKUP *lookup = X509_STORE_add_lookup( store, X509_LOOKUP_hash_dir() );
					for ( i=1; dirs[i]; i++ )
						X509_LOOKUP_add_dir( lookup, dirs[i], X509_FILETYPE_PEM );
				}
				ldap_charray_free( dirs );
			}
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		}

		if ( is_server ) {
			STACK_OF(X509_NAME) *calist;
			/* List of CA names to send to a client */
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			calist = tlso_ca_list( lt->lt_cacertfile, lt->lt_cacertdir, cert );
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			if ( !calist ) {
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				Debug2( LDAP_DEBUG_ANY, "TLS: "
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					"could not load client CA list (file:`%s',dir:`%s').\n",
					lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
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					lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "" );
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				tlso_report_error( errmsg );
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				return -1;
			}

			SSL_CTX_set_client_CA_list( ctx, calist );
		}
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		if ( cert )
			X509_free( cert );
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	}

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	if ( lo->ldo_tls_cert.bv_val )
	{
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		const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_cert.bv_val);
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		X509 *cert = d2i_X509( NULL, &pp, lo->ldo_tls_cert.bv_len );
		if ( !SSL_CTX_use_certificate( ctx, cert )) {
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			Debug0( LDAP_DEBUG_ANY,
				"TLS: could not use certificate.\n" );
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			tlso_report_error( errmsg );
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			return -1;
		}
		X509_free( cert );
	} else
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	if ( lo->ldo_tls_certfile &&
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		!SSL_CTX_use_certificate_chain_file( ctx, lt->lt_certfile) )
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	{
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		Debug1( LDAP_DEBUG_ANY,
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			"TLS: could not use certificate file `%s'.\n",
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			lo->ldo_tls_certfile );
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		tlso_report_error( errmsg );
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		return -1;
	}

	/* Key validity is checked automatically if cert has already been set */
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	if ( lo->ldo_tls_key.bv_val )
	{
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		const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_key.bv_val);
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		EVP_PKEY *pkey = d2i_AutoPrivateKey( NULL, &pp, lo->ldo_tls_key.bv_len );
		if ( !SSL_CTX_use_PrivateKey( ctx, pkey ))
		{
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			Debug0( LDAP_DEBUG_ANY,
				"TLS: could not use private key.\n" );
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			tlso_report_error( errmsg );
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			return -1;
		}
		EVP_PKEY_free( pkey );
	} else
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	if ( lo->ldo_tls_keyfile &&
		!SSL_CTX_use_PrivateKey_file( ctx,
			lt->lt_keyfile, SSL_FILETYPE_PEM ) )
	{
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		Debug1( LDAP_DEBUG_ANY,
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			"TLS: could not use key file `%s'.\n",
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			lo->ldo_tls_keyfile );
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		tlso_report_error( errmsg );
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		return -1;
	}

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	if ( is_server && lo->ldo_tls_dhfile ) {
		DH *dh;
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		BIO *bio;

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		if (( bio=BIO_new_file( lt->lt_dhfile,"r" )) == NULL ) {
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			Debug1( LDAP_DEBUG_ANY,
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				"TLS: could not use DH parameters file `%s'.\n",
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				lo->ldo_tls_dhfile );
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			tlso_report_error( errmsg );
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			return -1;
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		}
		if (!( dh=PEM_read_bio_DHparams( bio, NULL, NULL, NULL ))) {
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			Debug1( LDAP_DEBUG_ANY,
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				"TLS: could not read DH parameters file `%s'.\n",
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				lo->ldo_tls_dhfile );
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			tlso_report_error( errmsg );
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			BIO_free( bio );
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			return -1;
		}
		BIO_free( bio );
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		SSL_CTX_set_tmp_dh( ctx, dh );
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		SSL_CTX_set_options( ctx, SSL_OP_SINGLE_DH_USE );
		DH_free( dh );
	}

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	if ( lo->ldo_tls_ecname ) {
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		Debug0( LDAP_DEBUG_ANY,
			"TLS: Elliptic Curves not supported.\n" );
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		return -1;
#else
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		if ( !SSL_CTX_set1_curves_list( ctx, lt->lt_ecname )) {
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			Debug1( LDAP_DEBUG_ANY,
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				lo->ldo_tls_ecname );
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			tlso_report_error( errmsg );
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			return -1;
		}
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	/*
	 * This is a NOP in OpenSSL 1.1.0 and later, where curves are always
	 * auto-negotiated.
	 */
#if OPENSSL_VERSION_NUMBER < 0x10100000UL
		if ( SSL_CTX_set_ecdh_auto( ctx, 1 ) <= 0 ) {
			Debug0( LDAP_DEBUG_ANY,
				"TLS: could not enable automatic EC negotiation.\n" );
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		}
#endif
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#endif	/* OPENSSL_NO_EC */
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	}
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	if ( tlso_opt_trace ) {
		SSL_CTX_set_info_callback( ctx, tlso_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( ctx, i,
		lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ?
		tlso_verify_ok : tlso_verify_cb );
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	SSL_CTX_set_tmp_rsa_callback( ctx, tlso_tmp_rsa_cb );
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#endif
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	if ( lo->ldo_tls_crlcheck ) {
		X509_STORE *x509_s = SSL_CTX_get_cert_store( 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  );
		}
	}
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	/* Explicitly honor the server side cipher suite preference */
	SSL_CTX_set_options( ctx, SSL_OP_CIPHER_SERVER_PREFERENCE );
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	return 0;
}

static tls_session *
tlso_session_new( tls_ctx *ctx, int is_server )
{
	tlso_ctx *c = (tlso_ctx *)ctx;
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	return (tls_session *)SSL_new( c );
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}

static int
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tlso_session_connect( LDAP *ld, tls_session *sess, const char *name_in )
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{
	tlso_session *s = (tlso_session *)sess;
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	int rc;
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#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
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	if ( name_in ) {
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		rc = SSL_set_tlsext_host_name( s, name_in );
		if ( !rc )		/* can fail to strdup the name */
			return -1;
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	}
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#endif
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	/* Caller expects 0 = success, OpenSSL returns 1 = success */
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	rc = SSL_connect( s ) - 1;
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	return rc;
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}

static int
tlso_session_accept( tls_session *sess )
{
	tlso_session *s = (tlso_session *)sess;

	/* Caller expects 0 = success, OpenSSL returns 1 = success */
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	return SSL_accept( s ) - 1;
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}

static int
tlso_session_upflags( Sockbuf *sb, tls_session *sess, int rc )
{
	tlso_session *s = (tlso_session *)sess;

	/* 1 was subtracted above, offset it back now */
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	rc = SSL_get_error(s, rc+1);
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	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;
	}
	return 0;
}

static char *
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tlso_session_errmsg( tls_session *sess, int rc, char *buf, size_t len )
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{
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	char err[256] = "";
	const char *certerr=NULL;
	tlso_session *s = (tlso_session *)sess;

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	rc = ERR_peek_error();
	if ( rc ) {
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		ERR_error_string_n( rc, err, sizeof(err) );
		if ( ( ERR_GET_LIB(rc) == ERR_LIB_SSL ) && 
				( ERR_GET_REASON(rc) == SSL_R_CERTIFICATE_VERIFY_FAILED ) ) {
			int certrc = SSL_get_verify_result(s);
			certerr = (char *)X509_verify_cert_error_string(certrc);
		}
		snprintf(buf, len, "%s%s%s%s", err, certerr ? " (" :"", 
				certerr ? certerr : "", certerr ?  ")" : "" );
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		return buf;
	}
	return NULL;
}

static int
tlso_session_my_dn( tls_session *sess, struct berval *der_dn )
{
	tlso_session *s = (tlso_session *)sess;
	X509 *x;
	X509_NAME *xn;

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	x = SSL_get_certificate( s );
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	if (!x) return LDAP_INVALID_CREDENTIALS;
	
	xn = X509_get_subject_name(x);
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#if OPENSSL_VERSION_NUMBER < 0x10100000
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	der_dn->bv_len = i2d_X509_NAME( xn, NULL );
	der_dn->bv_val = xn->bytes->data;
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#else
	{
		size_t len = 0;
		der_dn->bv_val = NULL;
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		X509_NAME_get0_der( xn, (const unsigned char **)&der_dn->bv_val, &len );
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		der_dn->bv_len = len;
	}
#endif
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	/* Don't X509_free, the session is still using it */
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	return 0;
}

static X509 *
tlso_get_cert( SSL *s )
{
	/* If peer cert was bad, treat as if no cert was given */
	if (SSL_get_verify_result(s)) {
		return NULL;
	}
	return SSL_get_peer_certificate(s);
}

static int
tlso_session_peer_dn( tls_session *sess, struct berval *der_dn )
{
	tlso_session *s = (tlso_session *)sess;
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	X509 *x = tlso_get_cert( s );
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	X509_NAME *xn;

	if ( !x )
		return LDAP_INVALID_CREDENTIALS;

	xn = X509_get_subject_name(x);
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#if OPENSSL_VERSION_NUMBER < 0x10100000
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	der_dn->bv_len = i2d_X509_NAME( xn, NULL );
	der_dn->bv_val = xn->bytes->data;
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#else
	{
		size_t len = 0;
		der_dn->bv_val = NULL;
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		X509_NAME_get0_der( xn, (const unsigned char **)&der_dn->bv_val, &len );
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		der_dn->bv_len = len;
	}
#endif
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	X509_free(x);
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	return 0;
}

/* what kind of hostname were we given? */
#define	IS_DNS	0
#define	IS_IP4	1
#define	IS_IP6	2

static int
tlso_session_chkhost( LDAP *ld, tls_session *sess, const char *name_in )
{
	tlso_session *s = (tlso_session *)sess;
	int i, ret = LDAP_LOCAL_ERROR;
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	int chkSAN = ld->ld_options.ldo_tls_require_san, gotSAN = 0;
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	X509 *x;
	const char *name;
	char *ptr;
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	int ntype = IS_DNS, nlen;
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#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;
	}
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	nlen = strlen(name);
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	x = tlso_get_cert(s);
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	if (!x) {
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		Debug0( LDAP_DEBUG_ANY,
			"TLS: unable to get peer certificate.\n" );
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		/* If this was a fatal condition, things would have
		 * aborted long before now.
		 */
		return LDAP_SUCCESS;
	}

#ifdef LDAP_PF_INET6
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	if (inet_pton(AF_INET6, name, &addr)) {
		ntype = IS_IP6;
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	} else 
#endif
	if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) {
		if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4;
	}
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	if (chkSAN) {
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	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) {
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			int n, len2 = 0;
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			char *domain = NULL;
			GENERAL_NAME *gn;

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			gotSAN = 1;
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			if (ntype == IS_DNS) {
				domain = strchr(name, '.');
				if (domain) {
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					len2 = nlen - (domain-name);
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				}
			}
			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? */
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					if ((nlen == sl) && !strncasecmp(name, sn, nlen)) {
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						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;
			}
		}
	}
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	}
	if (ret != LDAP_SUCCESS && chkSAN) {
		switch(chkSAN) {
		case LDAP_OPT_X_TLS_DEMAND:
		case LDAP_OPT_X_TLS_HARD:
			if (!gotSAN) {
				Debug0( LDAP_DEBUG_ANY,
					"TLS: unable to get subjectAltName from peer certificate.\n" );
				ret = LDAP_CONNECT_ERROR;
				if ( ld->ld_error ) {
					LDAP_FREE( ld->ld_error );
				}
				ld->ld_error = LDAP_STRDUP(
					_("TLS: unable to get subjectAltName from peer certificate"));
				goto done;
			}
			/* FALLTHRU */
		case LDAP_OPT_X_TLS_TRY:
			if (gotSAN) {
				Debug1( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
					"subjectAltName in certificate.\n",
					name );
				ret = LDAP_CONNECT_ERROR;
				if ( ld->ld_error ) {
					LDAP_FREE( ld->ld_error );
				}
				ld->ld_error = LDAP_STRDUP(
					_("TLS: hostname does not match subjectAltName in peer certificate"));
				goto done;
			}
			break;
		case LDAP_OPT_X_TLS_ALLOW:
			break;
		}
	}
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	if (ret != LDAP_SUCCESS) {
		X509_NAME *xn;
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		X509_NAME_ENTRY *ne;
		ASN1_OBJECT *obj;
		ASN1_STRING *cn = NULL;
		int navas;

		/* find the last CN */
		obj = OBJ_nid2obj( NID_commonName );
		if ( !obj ) goto no_cn;	/* should never happen */
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		xn = X509_get_subject_name(x);
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		navas = X509_NAME_entry_count( xn );
		for ( i=navas-1; i>=0; i-- ) {
			ne = X509_NAME_get_entry( xn, i );
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			if ( !OBJ_cmp( X509_NAME_ENTRY_get_object(ne), obj )) {
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				cn = X509_NAME_ENTRY_get_data( ne );
				break;
			}
		}

		if( !cn )
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		{
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no_cn:
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			Debug0( LDAP_DEBUG_ANY,
				"TLS: unable to get common name from peer certificate.\n" );
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			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"));

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		} else if ( cn->length == nlen &&
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			strncasecmp( name, (char *) cn->data, nlen ) == 0 ) {
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			ret = LDAP_SUCCESS;

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		} else if (( cn->data[0] == '*' ) && ( cn->data[1] == '.' )) {
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			char *domain = strchr(name, '.');
			if( domain ) {
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				int dlen;
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				dlen = nlen - (domain-name);
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				/* Is this a wildcard match? */
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				if ((dlen == cn->length-1) &&
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					!strncasecmp(domain, (char *) &cn->data[1], dlen)) {
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					ret = LDAP_SUCCESS;
				}
			}
		}

		if( ret == LDAP_LOCAL_ERROR ) {
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			Debug3( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
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				"common name in certificate (%.*s).\n", 
				name, cn->length, cn->data );
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			ret = LDAP_CONNECT_ERROR;
			if ( ld->ld_error ) {
				LDAP_FREE( ld->ld_error );
			}
			ld->ld_error = LDAP_STRDUP(
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				_("TLS: hostname does not match name in peer certificate"));
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		}
	}
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done:
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	X509_free(x);
	return ret;
}

static int
tlso_session_strength( tls_session *sess )
{
	tlso_session *s = (tlso_session *)sess;

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	return SSL_CIPHER_get_bits(SSL_get_current_cipher(s), NULL);
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}

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static int
tlso_session_unique( tls_session *sess, struct berval *buf, int is_server)
{
	tlso_session *s = (tlso_session *)sess;

	/* Usually the client sends the finished msg. But if the
	 * session was resumed, the server sent the msg.
	 */
	if (SSL_session_reused(s) ^ !is_server)
		buf->bv_len = SSL_get_finished(s, buf->bv_val, buf->bv_len);
	else
		buf->bv_len = SSL_get_peer_finished(s, buf->bv_val, buf->bv_len);
	return buf->bv_len;
}

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static int
tlso_session_endpoint( tls_session *sess, struct berval *buf, int is_server )
{
	tlso_session *s = (tlso_session *)sess;
	const EVP_MD *md;
	unsigned int md_len;
	X509 *cert;

	if ( buf->bv_len < EVP_MAX_MD_SIZE )
		return 0;

	if ( is_server )
		cert = SSL_get_certificate( s );
	else
		cert = SSL_get_peer_certificate( s );

	if ( cert == NULL )
		return 0;

#if OPENSSL_VERSION_NUMBER >= 0x10100000
	md = EVP_get_digestbynid( X509_get_signature_nid( cert ));
#else
	md = EVP_get_digestbynid(OBJ_obj2nid( cert->sig_alg->algorithm ));
#endif

	/* See RFC 5929 */
	if ( md == NULL ||
	     md == EVP_md_null() ||
#ifndef OPENSSL_NO_MD2
	     md == EVP_md2() ||
#endif
	     md == EVP_md4() ||
	     md == EVP_md5() ||
	     md == EVP_sha1() )
		md = EVP_sha256();

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	if ( !X509_digest( cert, md, (unsigned char *) (buf->bv_val), &md_len ))
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		md_len = 0;
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	buf->bv_len = md_len;
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	if ( !is_server )
		X509_free( cert );
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	return md_len;
}

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static const char *
tlso_session_version( tls_session *sess )
{
	tlso_session *s = (tlso_session *)sess;
	return SSL_get_version(s);
}

static const char *
tlso_session_cipher( tls_session *sess )
{
	tlso_session *s = (tlso_session *)sess;
	return SSL_CIPHER_get_name(SSL_get_current_cipher(s));
}

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static int
tlso_session_peercert( tls_session *sess, struct berval *der )
{
	tlso_session *s = (tlso_session *)sess;
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	int ret = -1;
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	X509 *x = SSL_get_peer_certificate(s);
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	if ( x ) {
		der->bv_len = i2d_X509(x, NULL);
		der->bv_val = LDAP_MALLOC(der->bv_len);
		if ( der->bv_val ) {
			unsigned char *ptr = (unsigned char *) (der->bv_val);
			i2d_X509(x, &ptr);
			ret = 0;
		}
		X509_free( x );
	}
	return ret;
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}

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static int
tlso_session_pinning( LDAP *ld, tls_session *sess, char *hashalg, struct berval *hash )
{
	tlso_session *s = (tlso_session *)sess;
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	unsigned char *tmp, digest[EVP_MAX_MD_SIZE];
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	struct berval key,
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				  keyhash = { sizeof(digest), (char *) digest };
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	X509 *cert = SSL_get_peer_certificate(s);
	int len, rc = LDAP_SUCCESS;

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	if ( !cert )
		return -1;

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	len = i2d_X509_PUBKEY( X509_get_X509_PUBKEY(cert), NULL );

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	tmp = LDAP_MALLOC( len );
	key.bv_val = (char *) tmp;

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	if ( !key.bv_val ) {
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		rc = -1;
		goto done;
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	}

	key.bv_len = i2d_X509_PUBKEY( X509_get_X509_PUBKEY(cert), &tmp );

	if ( hashalg ) {
		const EVP_MD *md;
		EVP_MD_CTX *mdctx;
		unsigned int len = keyhash.bv_len;

		md = EVP_get_digestbyname( hashalg );
		if ( !md ) {
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			Debug1( LDAP_DEBUG_TRACE, "tlso_session_pinning: "
					"hash %s not recognised by OpenSSL\n", hashalg );
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			rc = -1;
			goto done;
		}

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#if OPENSSL_VERSION_NUMBER >= 0x10100000
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		mdctx = EVP_MD_CTX_new();
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#else
		mdctx = EVP_MD_CTX_create();
#endif
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		if ( !mdctx ) {
			rc = -1;
			goto done;
		}

		EVP_DigestInit_ex( mdctx, md, NULL );
		EVP_DigestUpdate( mdctx, key.bv_val, key.bv_len );
		EVP_DigestFinal_ex( mdctx, (unsigned char *)keyhash.bv_val, &len );
		keyhash.bv_len = len;
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		EVP_MD_CTX_free( mdctx );
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#else
		EVP_MD_CTX_destroy( mdctx );
#endif
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	} else {
		keyhash = key;
	}

	if ( ber_bvcmp( hash, &keyhash ) ) {
		rc = LDAP_CONNECT_ERROR;
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		Debug0( LDAP_DEBUG_ANY, "tlso_session_pinning: "
				"public key hash does not match provided pin.\n" );
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		if ( ld->ld_error ) {
			LDAP_FREE( ld->ld_error );
		}
		ld->ld_error = LDAP_STRDUP(
			_("TLS: public key hash does not match provided pin"));
	}

done:
	LDAP_FREE( key.bv_val );
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	X509_free( cert );
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	return rc;
}

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/*
 * TLS support for LBER Sockbufs
 */

struct tls_data {
	tlso_session		*session;
	Sockbuf_IO_Desc		*sbiod;
};

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#if OPENSSL_VERSION_NUMBER < 0x10100000
#define BIO_set_init(b, x)	b->init = x
#define BIO_set_data(b, x)	b->ptr = x
#define BIO_clear_flags(b, x)	b->flags &= ~(x)
#define BIO_get_data(b)	b->ptr
#endif
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static int
tlso_bio_create( BIO *b ) {
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	BIO_set_init( b, 1 );
	BIO_set_data( b, NULL );
	BIO_clear_flags( b, ~0 );
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	return 1;
}

static int
tlso_bio_destroy( BIO *b )
{
	if ( b == NULL ) return 0;

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	BIO_set_data( b, NULL );		/* sb_tls_remove() will free it */
	BIO_set_init( b, 0 );
	BIO_clear_flags( b, ~0 );
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	return 1;
}

static int
tlso_bio_read( BIO *b, char *buf, int len )
{
	struct tls_data		*p;
	int			ret;
		
	if ( buf == NULL || len <= 0 ) return 0;

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	p = (struct tls_data *)BIO_get_data(b);
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	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
tlso_bio_write( BIO *b, const char *buf, int len )
{
	struct tls_data		*p;
	int			ret;
	
	if ( buf == NULL || len <= 0 ) return 0;
	
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	p = (struct tls_data *)BIO_get_data(b);
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	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
tlso_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
tlso_bio_gets( BIO *b, char *buf, int len )
{
	return -1;
}

static int
tlso_bio_puts( BIO *b, const char *str )
{
	return tlso_bio_write( b, str, strlen( str ) );
}
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static BIO_METHOD *
tlso_bio_setup( void )
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{
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	/* it's a source/sink BIO */
	BIO_METHOD * method = BIO_meth_new( 100 | 0x400, "sockbuf glue" );
	BIO_meth_set_write( method, tlso_bio_write );
	BIO_meth_set_read( method, tlso_bio_read );
	BIO_meth_set_puts( method, tlso_bio_puts );
	BIO_meth_set_gets( method, tlso_bio_gets );
	BIO_meth_set_ctrl( method, tlso_bio_ctrl );
	BIO_meth_set_create( method, tlso_bio_create );
	BIO_meth_set_destroy( method, tlso_bio_destroy );

	return method;
}
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static int
tlso_sb_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->session = arg;
	p->sbiod = sbiod;
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	bio = BIO_new( tlso_bio_method );
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	BIO_set_data( bio, p );
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	SSL_set_bio( p->session, bio, bio );
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	sbiod->sbiod_pvt = p;
	return 0;
}

static int
tlso_sb_remove( Sockbuf_IO_Desc *sbiod )
{
	struct tls_data		*p;
	
	assert( sbiod != NULL );
	assert( sbiod->sbiod_pvt != NULL );

	p = (struct tls_data *)sbiod->sbiod_pvt;
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	SSL_free( p->session );
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	LBER_FREE( sbiod->sbiod_pvt );
	sbiod->sbiod_pvt = NULL;
	return 0;
}

static int
tlso_sb_close( Sockbuf_IO_Desc *sbiod )
{
	struct tls_data		*p;
	
	assert( sbiod != NULL );
	assert( sbiod->sbiod_pvt != NULL );

	p = (struct tls_data *)sbiod->sbiod_pvt;
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	SSL_shutdown( p->session );
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	return 0;
}

static int
tlso_sb_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 ) {
		*((tlso_session **)arg) = p->session;
		return 1;

	} else if ( opt == LBER_SB_OPT_DATA_READY ) {
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		if( SSL_pending( p->session ) > 0 ) {
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			return 1;
		}
	}
	
	return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
}

static ber_slen_t
tlso_sb_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;

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	ret = SSL_read( p->session, (char *)buf, len );
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	errno = WSAGetLastError();
#endif
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	err = SSL_get_error( p->session, ret );
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	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