/* $NetBSD: tls_o.c,v 1.6.6.1 2019/08/10 06:17:14 martin Exp $ */ /* tls_o.c - Handle tls/ssl using OpenSSL */ /* $OpenLDAP$ */ /* This work is part of OpenLDAP Software . * * Copyright 2008-2019 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 * . */ /* ACKNOWLEDGEMENTS: Rewritten by Howard Chu */ #include __RCSID("$NetBSD: tls_o.c,v 1.6.6.1 2019/08/10 06:17:14 martin Exp $"); #include "portable.h" #ifdef HAVE_OPENSSL #include "ldap_config.h" #include #include #include #include #include #include #include #include #include #include #include "ldap-int.h" #include "ldap-tls.h" #ifdef HAVE_OPENSSL_SSL_H #include #include #include #include #include #include #include #include #elif defined( HAVE_SSL_H ) #include #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 ( is_server && lo->ldo_tls_ecname ) { #ifdef OPENSSL_NO_EC Debug( LDAP_DEBUG_ANY, "TLS: Elliptic Curves not supported.\n", 0,0,0 ); return -1; #else EC_KEY *ecdh; int nid = OBJ_sn2nid( lt->lt_ecname ); if ( nid == NID_undef ) { Debug( LDAP_DEBUG_ANY, "TLS: could not use EC name `%s'.\n", lo->ldo_tls_ecname,0,0); tlso_report_error(); return -1; } ecdh = EC_KEY_new_by_curve_name( nid ); if ( ecdh == NULL ) { Debug( LDAP_DEBUG_ANY, "TLS: could not generate key for EC name `%s'.\n", lo->ldo_tls_ecname,0,0); tlso_report_error(); return -1; } SSL_CTX_set_tmp_ecdh( ctx, ecdh ); SSL_CTX_set_options( ctx, SSL_OP_SINGLE_ECDH_USE ); EC_KEY_free( ecdh ); #endif } 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; 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; } 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; if (ntype == IS_DNS) { domain = strchr(name, '.'); if (domain) { len2 = nlen - (domain-name); } } n = sk_GENERAL_NAME_num(alt); for (i=0; itype == 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) { 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 CN in peer certificate")); } } 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 */