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openldap/libraries/libldap/tls_o.c

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/* tls_o.c - Handle tls/ssl using SSLeay or OpenSSL */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2008-2009 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: 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 LDAP_R_COMPILE
#include <ldap_pvt_thread.h>
#endif
#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
typedef SSL_CTX tlso_ctx;
typedef SSL tlso_session;
static int tlso_opt_trace = 1;
static void tlso_report_error( void );
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 );
static RSA * tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );
static DH * tlso_tmp_dh_cb( SSL *ssl, int is_export, int key_length );
typedef struct dhplist {
struct dhplist *next;
int keylength;
DH *param;
} dhplist;
static dhplist *tlso_dhparams;
static int tlso_seed_PRNG( const char *randfile );
#ifdef LDAP_R_COMPILE
/*
* provide mutexes for the SSLeay library.
*/
static ldap_pvt_thread_mutex_t tlso_mutexes[CRYPTO_NUM_LOCKS];
static ldap_pvt_thread_mutex_t tlso_dh_mutex;
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] );
}
}
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();
}
static void tlso_thr_init( void )
{
int i;
for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) {
ldap_pvt_thread_mutex_init( &tlso_mutexes[i] );
}
ldap_pvt_thread_mutex_init( &tlso_dh_mutex );
CRYPTO_set_locking_callback( tlso_locking_cb );
CRYPTO_set_id_callback( tlso_thread_self );
}
#endif /* LDAP_R_COMPILE */
static STACK_OF(X509_NAME) *
tlso_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;
}
/*
* 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
SSL_load_error_strings();
SSLeay_add_ssl_algorithms();
/* FIXME: mod_ssl does this */
X509V3_add_standard_extensions();
return 0;
}
/*
* Tear down the TLS subsystem. Should only be called once.
*/
static void
tlso_destroy( void )
{
struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
EVP_cleanup();
ERR_remove_state(0);
ERR_free_strings();
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 )
{
return (tls_ctx *) SSL_CTX_new( SSLv23_method() );
}
static void
tlso_ctx_ref( tls_ctx *ctx )
{
tlso_ctx *c = (tlso_ctx *)ctx;
CRYPTO_add( &c->references, 1, CRYPTO_LOCK_SSL_CTX );
}
static void
tlso_ctx_free ( tls_ctx *ctx )
{
tlso_ctx *c = (tlso_ctx *)ctx;
SSL_CTX_free( c );
}
/*
* initialize a new TLS context
*/
static int
tlso_ctx_init( struct ldapoptions *lo, struct ldaptls *lt, int is_server )
{
tlso_ctx *ctx = (tlso_ctx *)lo->ldo_tls_ctx;
int i;
if ( is_server ) {
SSL_CTX_set_session_id_context( ctx,
(const unsigned char *) "OpenLDAP", sizeof("OpenLDAP")-1 );
}
if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 );
else if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL2 )
SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 );
if ( lo->ldo_tls_ciphersuite &&
!SSL_CTX_set_cipher_list( ctx, lt->lt_ciphersuite ) )
{
Debug( LDAP_DEBUG_ANY,
"TLS: could not set cipher list %s.\n",
lo->ldo_tls_ciphersuite, 0, 0 );
tlso_report_error();
return -1;
}
if (lo->ldo_tls_cacertfile != NULL || lo->ldo_tls_cacertdir != NULL) {
if ( !SSL_CTX_load_verify_locations( ctx,
lt->lt_cacertfile, lt->lt_cacertdir ) ||
!SSL_CTX_set_default_verify_paths( 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 );
tlso_report_error();
return -1;
}
if ( is_server ) {
STACK_OF(X509_NAME) *calist;
/* List of CA names to send to a client */
calist = tlso_ca_list( lt->lt_cacertfile, lt->lt_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 );
tlso_report_error();
return -1;
}
SSL_CTX_set_client_CA_list( ctx, calist );
}
}
if ( lo->ldo_tls_certfile &&
!SSL_CTX_use_certificate_file( ctx,
lt->lt_certfile, SSL_FILETYPE_PEM ) )
{
Debug( LDAP_DEBUG_ANY,
"TLS: could not use certificate `%s'.\n",
lo->ldo_tls_certfile,0,0);
tlso_report_error();
return -1;
}
/* Key validity is checked automatically if cert has already been set */
if ( lo->ldo_tls_keyfile &&
!SSL_CTX_use_PrivateKey_file( ctx,
lt->lt_keyfile, SSL_FILETYPE_PEM ) )
{
Debug( LDAP_DEBUG_ANY,
"TLS: could not use key file `%s'.\n",
lo->ldo_tls_keyfile,0,0);
tlso_report_error();
return -1;
}
if ( lo->ldo_tls_dhfile ) {
DH *dh = NULL;
BIO *bio;
dhplist *p;
if (( bio=BIO_new_file( lt->lt_dhfile,"r" )) == NULL ) {
Debug( LDAP_DEBUG_ANY,
"TLS: could not use DH parameters file `%s'.\n",
lo->ldo_tls_dhfile,0,0);
tlso_report_error();
return -1;
}
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 = tlso_dhparams;
tlso_dhparams = p;
}
}
BIO_free( bio );
}
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 );
SSL_CTX_set_tmp_rsa_callback( ctx, tlso_tmp_rsa_cb );
if ( lo->ldo_tls_dhfile ) {
SSL_CTX_set_tmp_dh_callback( ctx, tlso_tmp_dh_cb );
}
#ifdef HAVE_OPENSSL_CRL
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 );
}
}
#endif
return 0;
}
static tls_session *
tlso_session_new( tls_ctx *ctx, int is_server )
{
tlso_ctx *c = (tlso_ctx *)ctx;
return (tls_session *)SSL_new( c );
}
static int
tlso_session_connect( LDAP *ld, tls_session *sess )
{
tlso_session *s = (tlso_session *)sess;
/* Caller expects 0 = success, OpenSSL returns 1 = success */
return SSL_connect( s ) - 1;
}
static int
tlso_session_accept( tls_session *sess )
{
tlso_session *s = (tlso_session *)sess;
/* Caller expects 0 = success, OpenSSL returns 1 = success */
return SSL_accept( s ) - 1;
}
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 */
rc = SSL_get_error(s, rc+1);
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 *
tlso_session_errmsg( int rc, char *buf, size_t len )
{
rc = ERR_peek_error();
if ( rc ) {
ERR_error_string_n( rc, buf, len );
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;
x = SSL_get_certificate( 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;
/* Don't X509_free, the session is still using it */
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;
X509 *x = tlso_get_cert( s );
X509_NAME *xn;
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;
X509_free(x);
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;
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 = tlso_get_cert(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, ']') = 0;
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;
}
static int
tlso_session_strength( tls_session *sess )
{
tlso_session *s = (tlso_session *)sess;
SSL_CIPHER *c;
c = SSL_get_current_cipher(s);
return SSL_CIPHER_get_bits(c, NULL);
}
/*
* TLS support for LBER Sockbufs
*/
struct tls_data {
tlso_session *session;
Sockbuf_IO_Desc *sbiod;
};
static int
tlso_bio_create( BIO *b ) {
b->init = 1;
b->num = 0;
b->ptr = NULL;
b->flags = 0;
return 1;
}
static int
tlso_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
tlso_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
tlso_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
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 ) );
}
static BIO_METHOD tlso_bio_method =
{
( 100 | 0x400 ), /* it's a source/sink BIO */
"sockbuf glue",
tlso_bio_write,
tlso_bio_read,
tlso_bio_puts,
tlso_bio_gets,
tlso_bio_ctrl,
tlso_bio_create,
tlso_bio_destroy
};
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;
bio = BIO_new( &tlso_bio_method );
bio->ptr = (void *)p;
SSL_set_bio( p->session, bio, bio );
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;
SSL_free( p->session );
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;
SSL_shutdown( p->session );
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 ) {
if( SSL_pending( p->session ) > 0 ) {
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;
ret = SSL_read( p->session, (char *)buf, len );
#ifdef HAVE_WINSOCK
errno = WSAGetLastError();
#endif
err = SSL_get_error( p->session, 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
tlso_sb_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->session, (char *)buf, len );
#ifdef HAVE_WINSOCK
errno = WSAGetLastError();
#endif
err = SSL_get_error( p->session, 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;
}
static Sockbuf_IO tlso_sbio =
{
tlso_sb_setup, /* sbi_setup */
tlso_sb_remove, /* sbi_remove */
tlso_sb_ctrl, /* sbi_ctrl */
tlso_sb_read, /* sbi_read */
tlso_sb_write, /* sbi_write */
tlso_sb_close /* sbi_close */
};
/* Derived from openssl/apps/s_cb.c */
static void
tlso_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
tlso_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
tlso_verify_ok( int ok, X509_STORE_CTX *ctx )
{
(void) tlso_verify_cb( ok, ctx );
return 1;
}
/* Inspired by ERR_print_errors in OpenSSL */
static void
tlso_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 *
tlso_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
tlso_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 tlso_dhpem512[] =
"-----BEGIN DH PARAMETERS-----\n\
MEYCQQDaWDwW2YUiidDkr3VvTMqS3UvlM7gE+w/tlO+cikQD7VdGUNNpmdsp13Yn\n\
a6LT1BLiGPTdHghM9tgAPnxHdOgzAgEC\n\
-----END DH PARAMETERS-----\n";
static const char tlso_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 tlso_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 tlso_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 tlso_dhpem[] = {
{ 512, tlso_dhpem512, sizeof(tlso_dhpem512) },
{ 1024, tlso_dhpem1024, sizeof(tlso_dhpem1024) },
{ 2048, tlso_dhpem2048, sizeof(tlso_dhpem2048) },
{ 4096, tlso_dhpem4096, sizeof(tlso_dhpem4096) },
{ 0, NULL, 0 }
};
static DH *
tlso_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( &tlso_dh_mutex );
#endif
for ( p = tlso_dhparams; p; p=p->next ) {
if ( p->keylength == key_length ) {
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &tlso_dh_mutex );
#endif
return p->param;
}
}
/* No - check for hardcoded params */
for (i=0; tlso_dhpem[i].keylength; i++) {
if ( tlso_dhpem[i].keylength == key_length ) {
b = BIO_new_mem_buf( (char *)tlso_dhpem[i].pem, tlso_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 = tlso_dhparams;
tlso_dhparams = p;
}
}
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &tlso_dh_mutex );
#endif
return dh;
}
tls_impl ldap_int_tls_impl = {
"OpenSSL",
tlso_init,
tlso_destroy,
tlso_ctx_new,
tlso_ctx_ref,
tlso_ctx_free,
tlso_ctx_init,
tlso_session_new,
tlso_session_connect,
tlso_session_accept,
tlso_session_upflags,
tlso_session_errmsg,
tlso_session_my_dn,
tlso_session_peer_dn,
tlso_session_chkhost,
tlso_session_strength,
&tlso_sbio,
#ifdef LDAP_R_COMPILE
tlso_thr_init,
#else
NULL,
#endif
0
};
#endif /* HAVE_OPENSSL */
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