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-rw-r--r--libraries/libldap/tls_o.c1378
1 files changed, 1378 insertions, 0 deletions
diff --git a/libraries/libldap/tls_o.c b/libraries/libldap/tls_o.c
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index 0000000..a13f11f
--- /dev/null
+++ b/libraries/libldap/tls_o.c
@@ -0,0 +1,1378 @@
+/* tls_o.c - Handle tls/ssl using OpenSSL */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2008-2021 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 HAVE_OPENSSL_SSL_H
+#include <openssl/ssl.h>
+#include <openssl/x509v3.h>
+#include <openssl/err.h>
+#include <openssl/rand.h>
+#include <openssl/safestack.h>
+#include <openssl/bn.h>
+#include <openssl/rsa.h>
+#include <openssl/dh.h>
+#elif defined( HAVE_SSL_H )
+#include <ssl.h>
+#endif
+
+#if OPENSSL_VERSION_NUMBER >= 0x10100000
+#define ASN1_STRING_data(x) ASN1_STRING_get0_data(x)
+#endif
+
+typedef SSL_CTX tlso_ctx;
+typedef SSL tlso_session;
+
+static BIO_METHOD * tlso_bio_method = NULL;
+static BIO_METHOD * tlso_bio_setup( void );
+
+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 int tlso_seed_PRNG( const char *randfile );
+#if OPENSSL_VERSION_NUMBER < 0x10100000
+/*
+ * OpenSSL 1.1 API and later has new locking code
+*/
+static RSA * tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );
+
+#ifdef LDAP_R_COMPILE
+/*
+ * provide mutexes for the OpenSSL library.
+ */
+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] );
+ }
+}
+
+#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
+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();
+}
+#endif
+
+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 */
+#else
+#ifdef LDAP_R_COMPILE
+static void tlso_thr_init( void ) {}
+#endif
+#endif /* OpenSSL 1.1 */
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000
+/*
+ * OpenSSL 1.1 API and later makes the BIO method concrete types internal.
+ */
+
+static BIO_METHOD *
+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 */
+
+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
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000
+ SSL_load_error_strings();
+ SSL_library_init();
+ OpenSSL_add_all_digests();
+#else
+ OPENSSL_init_ssl(0, NULL);
+#endif
+
+ /* FIXME: mod_ssl does this */
+ X509V3_add_standard_extensions();
+
+ tlso_bio_method = tlso_bio_setup();
+
+ return 0;
+}
+
+/*
+ * Tear down the TLS subsystem. Should only be called once.
+ */
+static void
+tlso_destroy( void )
+{
+ struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
+
+ BIO_meth_free( tlso_bio_method );
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000
+ EVP_cleanup();
+#if OPENSSL_VERSION_NUMBER < 0x10000000
+ ERR_remove_state(0);
+#else
+ ERR_remove_thread_state(NULL);
+#endif
+ ERR_free_strings();
+#endif
+
+ 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;
+#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 );
+}
+
+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 );
+ }
+
+#ifdef SSL_OP_NO_TLSv1
+#ifdef SSL_OP_NO_TLSv1_1
+#ifdef SSL_OP_NO_TLSv1_2
+ if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_2)
+ SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
+ SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1 |
+ SSL_OP_NO_TLSv1_2 );
+ else
+#endif
+ if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_1)
+ SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
+ SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1 );
+ else
+#endif
+ if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_0)
+ SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
+ SSL_OP_NO_TLSv1);
+ else
+#endif
+ 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_set_default_verify_paths( ctx ) ) {
+ Debug( LDAP_DEBUG_ANY, "TLS: "
+ "could not use default certificate paths", 0, 0, 0 );
+ tlso_report_error();
+ return -1;
+ }
+ } else {
+ if ( !SSL_CTX_load_verify_locations( ctx,
+ lt->lt_cacertfile, lt->lt_cacertdir ) )
+ {
+ 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 ( is_server && lo->ldo_tls_dhfile ) {
+ DH *dh;
+ BIO *bio;
+
+ 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;
+ }
+ if (!( dh=PEM_read_bio_DHparams( bio, NULL, NULL, NULL ))) {
+ Debug( LDAP_DEBUG_ANY,
+ "TLS: could not read DH parameters file `%s'.\n",
+ lo->ldo_tls_dhfile,0,0);
+ tlso_report_error();
+ BIO_free( bio );
+ return -1;
+ }
+ BIO_free( bio );
+ SSL_CTX_set_tmp_dh( ctx, dh );
+ SSL_CTX_set_options( ctx, SSL_OP_SINGLE_DH_USE );
+ DH_free( dh );
+ }
+
+ if ( lo->ldo_tls_ecname ) {
+#ifdef OPENSSL_NO_EC
+ Debug( LDAP_DEBUG_ANY,
+ "TLS: Elliptic Curves not supported.\n", 0,0,0 );
+ return -1;
+#else
+ if ( !SSL_CTX_set1_curves_list( ctx, lt->lt_ecname )) {
+ Debug( LDAP_DEBUG_ANY,
+ "TLS: could not set EC name `%s'.\n",
+ lo->ldo_tls_ecname,0,0);
+ tlso_report_error();
+ return -1;
+ }
+ /*
+ * 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 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "TLS: could not enable automatic EC negotiation.\n", 0, 0, 0 );
+ }
+#endif
+#endif /* OPENSSL_NO_EC */
+ }
+
+ 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 );
+#if OPENSSL_VERSION_NUMBER < 0x10100000
+ SSL_CTX_set_tmp_rsa_callback( ctx, tlso_tmp_rsa_cb );
+#endif
+#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 */
+ int rc = SSL_connect( s ) - 1;
+#ifdef LDAP_USE_NON_BLOCKING_TLS
+ if ( rc < 0 ) {
+ int sockerr = sock_errno();
+ int sslerr = SSL_get_error( s, rc+1 );
+ if ( sslerr == SSL_ERROR_WANT_READ || sslerr == SSL_ERROR_WANT_WRITE ) {
+ rc = 0;
+ } else if ( sslerr == SSL_ERROR_SYSCALL &&
+ ( sockerr == EAGAIN || sockerr == ENOTCONN )) {
+ rc = 0;
+ }
+ }
+#endif /* LDAP_USE_NON_BLOCKING_TLS */
+ return rc;
+}
+
+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( tls_session *sess, int rc, char *buf, size_t len )
+{
+ char err[256] = "";
+ const char *certerr=NULL;
+ tlso_session *s = (tlso_session *)sess;
+
+ rc = ERR_peek_error();
+ if ( rc ) {
+ 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 ? ")" : "" );
+ 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);
+#if OPENSSL_VERSION_NUMBER < 0x10100000
+ der_dn->bv_len = i2d_X509_NAME( xn, NULL );
+ der_dn->bv_val = xn->bytes->data;
+#else
+ {
+ size_t len = 0;
+ der_dn->bv_val = NULL;
+ X509_NAME_get0_der( xn, (const unsigned char **)&der_dn->bv_val, &len );
+ der_dn->bv_len = len;
+ }
+#endif
+ /* 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);
+#if OPENSSL_VERSION_NUMBER < 0x10100000
+ der_dn->bv_len = i2d_X509_NAME( xn, NULL );
+ der_dn->bv_val = xn->bytes->data;
+#else
+ {
+ size_t len = 0;
+ der_dn->bv_val = NULL;
+ X509_NAME_get0_der( xn, (const unsigned char **)&der_dn->bv_val, &len );
+ der_dn->bv_len = len;
+ }
+#endif
+ 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;
+ int chkSAN = ld->ld_options.ldo_tls_require_san, gotSAN = 0;
+ X509 *x;
+ const char *name;
+ char *ptr;
+ int ntype = IS_DNS, nlen;
+#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;
+ }
+ nlen = strlen(name);
+
+ 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 (inet_pton(AF_INET6, name, &addr)) {
+ ntype = IS_IP6;
+ } else
+#endif
+ if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) {
+ if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4;
+ }
+
+ if (chkSAN) {
+ 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, len2 = 0;
+ char *domain = NULL;
+ GENERAL_NAME *gn;
+
+ gotSAN = 1;
+ if (ntype == IS_DNS) {
+ domain = strchr(name, '.');
+ if (domain) {
+ len2 = nlen - (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 ((nlen == sl) && !strncasecmp(name, sn, nlen)) {
+ 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 && chkSAN) {
+ switch(chkSAN) {
+ case LDAP_OPT_X_TLS_DEMAND:
+ case LDAP_OPT_X_TLS_HARD:
+ if (!gotSAN) {
+ Debug( LDAP_DEBUG_ANY,
+ "TLS: unable to get subjectAltName 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 subjectAltName from peer certificate"));
+ goto done;
+ }
+ /* FALLTHRU */
+ case LDAP_OPT_X_TLS_TRY:
+ if (gotSAN) {
+ Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
+ "subjectAltName in certificate.\n",
+ name, 0, 0 );
+ 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;
+ }
+ }
+
+ if (ret != LDAP_SUCCESS) {
+ X509_NAME *xn;
+ 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 */
+
+ xn = X509_get_subject_name(x);
+ navas = X509_NAME_entry_count( xn );
+ for ( i=navas-1; i>=0; i-- ) {
+ ne = X509_NAME_get_entry( xn, i );
+ if ( !OBJ_cmp( X509_NAME_ENTRY_get_object(ne), obj )) {
+ cn = X509_NAME_ENTRY_get_data( ne );
+ break;
+ }
+ }
+
+ if( !cn )
+ {
+no_cn:
+ 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 ( cn->length == nlen &&
+ strncasecmp( name, (char *) cn->data, nlen ) == 0 ) {
+ ret = LDAP_SUCCESS;
+
+ } else if (( cn->data[0] == '*' ) && ( cn->data[1] == '.' )) {
+ char *domain = strchr(name, '.');
+ if( domain ) {
+ int dlen;
+
+ dlen = nlen - (domain-name);
+
+ /* Is this a wildcard match? */
+ if ((dlen == cn->length-1) &&
+ !strncasecmp(domain, (char *) &cn->data[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, cn->length, cn->data );
+ ret = LDAP_CONNECT_ERROR;
+ if ( ld->ld_error ) {
+ LDAP_FREE( ld->ld_error );
+ }
+ ld->ld_error = LDAP_STRDUP(
+ _("TLS: hostname does not match name in peer certificate"));
+ }
+ }
+done:
+ X509_free(x);
+ return ret;
+}
+
+static int
+tlso_session_strength( tls_session *sess )
+{
+ tlso_session *s = (tlso_session *)sess;
+
+ return SSL_CIPHER_get_bits(SSL_get_current_cipher(s), NULL);
+}
+
+/*
+ * TLS support for LBER Sockbufs
+ */
+
+struct tls_data {
+ tlso_session *session;
+ Sockbuf_IO_Desc *sbiod;
+};
+
+#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
+static int
+tlso_bio_create( BIO *b ) {
+ BIO_set_init( b, 1 );
+ BIO_set_data( b, NULL );
+ BIO_clear_flags( b, ~0 );
+ return 1;
+}
+
+static int
+tlso_bio_destroy( BIO *b )
+{
+ if ( b == NULL ) return 0;
+
+ BIO_set_data( b, NULL ); /* sb_tls_remove() will free it */
+ BIO_set_init( b, 0 );
+ BIO_clear_flags( b, ~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 *)BIO_get_data(b);
+
+ 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 *)BIO_get_data(b);
+
+ 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_setup( void )
+{
+ /* 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;
+}
+
+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_set_data( bio, 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 )
+ OPENSSL_free ( sname );
+ if ( iname )
+ OPENSSL_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
+ }
+}
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000
+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? */
+#if OPENSSL_VERSION_NUMBER >= 0x00908000
+ BIGNUM *bn = BN_new();
+ tmp_rsa = NULL;
+ if ( bn ) {
+ if ( BN_set_word( bn, RSA_F4 )) {
+ tmp_rsa = RSA_new();
+ if ( tmp_rsa && !RSA_generate_key_ex( tmp_rsa, key_length, bn, NULL )) {
+ RSA_free( tmp_rsa );
+ tmp_rsa = NULL;
+ }
+ }
+ BN_free( bn );
+ }
+#else
+ tmp_rsa = RSA_generate_key( key_length, RSA_F4, NULL, NULL );
+#endif
+
+ 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 tmp_rsa;
+}
+#endif /* OPENSSL_VERSION_NUMBER < 1.1 */
+
+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 ) );
+ }
+#ifndef OPENSSL_NO_EGD
+ else if (RAND_egd(randfile) > 0) {
+ /* EGD socket */
+ return 0;
+ }
+#endif
+
+ 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;
+}
+
+
+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 */