/* $OpenLDAP$ */ /* * Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved. * COPYING RESTRICTIONS APPLY, see COPYRIGHT file * * tls.c - Handle tls/ssl using SSLeay or OpenSSL. */ #include "portable.h" #include #include #include #include #include #include #include #include #include "ldap-int.h" #ifdef HAVE_TLS #ifdef LDAP_R_COMPILE #include #endif #ifdef HAVE_OPENSSL_SSL_H #include #include #include #include #include #elif defined( HAVE_SSL_H ) #include #endif static int tls_opt_trace = 1; static char *tls_opt_certfile = NULL; static char *tls_opt_keyfile = NULL; static char *tls_opt_cacertfile = NULL; static char *tls_opt_cacertdir = NULL; static int tls_opt_require_cert = 0; static char *tls_opt_ciphersuite = NULL; static char *tls_opt_randfile = NULL; #define HAS_TLS( sb ) ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO, \ (void *)&sb_tls_sbio ) static void tls_report_error( void ); static void tls_info_cb( SSL *ssl, int where, int ret ); static int tls_verify_cb( int ok, X509_STORE_CTX *ctx ); static int tls_verify_ok( int ok, X509_STORE_CTX *ctx ); static RSA * tls_tmp_rsa_cb( SSL *ssl, int is_export, int key_length ); static STACK_OF(X509_NAME) * get_ca_list( char * bundle, char * dir ); #if 0 /* Currently this is not used by anyone */ static DH * tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length ); #endif static SSL_CTX *tls_def_ctx = NULL; static int tls_seed_PRNG( const char *randfile ); #ifdef LDAP_R_COMPILE /* * provide mutexes for the SSLeay library. */ static ldap_pvt_thread_mutex_t tls_mutexes[CRYPTO_NUM_LOCKS]; static void tls_locking_cb( int mode, int type, const char *file, int line ) { if ( mode & CRYPTO_LOCK ) { ldap_pvt_thread_mutex_lock( &tls_mutexes[type] ); } else { ldap_pvt_thread_mutex_unlock( &tls_mutexes[type] ); } } /* * an extra mutex for the default ctx. */ static ldap_pvt_thread_mutex_t tls_def_ctx_mutex; static void tls_init_threads( void ) { int i; for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) { ldap_pvt_thread_mutex_init( &tls_mutexes[i] ); } CRYPTO_set_locking_callback( tls_locking_cb ); /* FIXME: the thread id should be added somehow... */ ldap_pvt_thread_mutex_init( &tls_def_ctx_mutex ); } #endif /* LDAP_R_COMPILE */ /* * Tear down the TLS subsystem. Should only be called once. */ void ldap_pvt_tls_destroy( void ) { SSL_CTX_free(tls_def_ctx); tls_def_ctx = NULL; EVP_cleanup(); ERR_free_strings(); if ( tls_opt_certfile ) { LDAP_FREE( tls_opt_certfile ); tls_opt_certfile = NULL; } if ( tls_opt_keyfile ) { LDAP_FREE( tls_opt_keyfile ); tls_opt_keyfile = NULL; } if ( tls_opt_cacertfile ) { LDAP_FREE( tls_opt_cacertfile ); tls_opt_cacertfile = NULL; } if ( tls_opt_cacertdir ) { LDAP_FREE( tls_opt_cacertdir ); tls_opt_cacertdir = NULL; } if ( tls_opt_ciphersuite ) { LDAP_FREE( tls_opt_ciphersuite ); tls_opt_ciphersuite = NULL; } if ( tls_opt_randfile ) { LDAP_FREE( tls_opt_randfile ); tls_opt_randfile = NULL; } } /* * Initialize TLS subsystem. Should be called only once. */ int ldap_pvt_tls_init( void ) { static int tls_initialized = 0; if ( tls_initialized ) return 0; tls_initialized = 1; (void) tls_seed_PRNG( tls_opt_randfile ); #ifdef LDAP_R_COMPILE tls_init_threads(); #endif SSL_load_error_strings(); SSLeay_add_ssl_algorithms(); /* FIXME: mod_ssl does this */ X509V3_add_standard_extensions(); return 0; } /* * initialize the default context */ int ldap_pvt_tls_init_def_ctx( void ) { STACK_OF(X509_NAME) *calist; #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_lock( &tls_def_ctx_mutex ); #endif if ( tls_def_ctx == NULL ) { int i; tls_def_ctx = SSL_CTX_new( SSLv23_method() ); if ( tls_def_ctx == NULL ) { Debug( LDAP_DEBUG_ANY, "TLS: could not allocate default ctx (%d).\n", ERR_peek_error(),0,0); goto error_exit; } if ( tls_opt_ciphersuite && !SSL_CTX_set_cipher_list( tls_def_ctx, tls_opt_ciphersuite ) ) { Debug( LDAP_DEBUG_ANY, "TLS: could not set cipher list %s.\n", tls_opt_ciphersuite, 0, 0 ); tls_report_error(); goto error_exit; } if (tls_opt_cacertfile != NULL || tls_opt_cacertdir != NULL) { if ( !SSL_CTX_load_verify_locations( tls_def_ctx, tls_opt_cacertfile, tls_opt_cacertdir ) || !SSL_CTX_set_default_verify_paths( tls_def_ctx ) ) { Debug( LDAP_DEBUG_ANY, "TLS: " "could not load verify locations (file:`%s',dir:`%s').\n", tls_opt_cacertfile ? tls_opt_cacertfile : "", tls_opt_cacertdir ? tls_opt_cacertdir : "", 0 ); tls_report_error(); goto error_exit; } calist = get_ca_list( tls_opt_cacertfile, tls_opt_cacertdir ); if ( !calist ) { Debug( LDAP_DEBUG_ANY, "TLS: " "could not load client CA list (file:`%s',dir:`%s').\n", tls_opt_cacertfile ? tls_opt_cacertfile : "", tls_opt_cacertdir ? tls_opt_cacertdir : "", 0 ); tls_report_error(); goto error_exit; } SSL_CTX_set_client_CA_list( tls_def_ctx, calist ); } if ( tls_opt_keyfile && !SSL_CTX_use_PrivateKey_file( tls_def_ctx, tls_opt_keyfile, SSL_FILETYPE_PEM ) ) { Debug( LDAP_DEBUG_ANY, "TLS: could not use key file `%s'.\n", tls_opt_keyfile,0,0); tls_report_error(); goto error_exit; } if ( tls_opt_certfile && !SSL_CTX_use_certificate_file( tls_def_ctx, tls_opt_certfile, SSL_FILETYPE_PEM ) ) { Debug( LDAP_DEBUG_ANY, "TLS: could not use certificate `%s'.\n", tls_opt_certfile,0,0); tls_report_error(); goto error_exit; } if ( ( tls_opt_certfile || tls_opt_keyfile ) && !SSL_CTX_check_private_key( tls_def_ctx ) ) { Debug( LDAP_DEBUG_ANY, "TLS: private key mismatch.\n", 0,0,0); tls_report_error(); goto error_exit; } if ( tls_opt_trace ) { SSL_CTX_set_info_callback( tls_def_ctx, tls_info_cb ); } i = SSL_VERIFY_NONE; if ( tls_opt_require_cert ) { i = SSL_VERIFY_PEER; if ( tls_opt_require_cert == LDAP_OPT_X_TLS_DEMAND || tls_opt_require_cert == LDAP_OPT_X_TLS_HARD ) { i |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT; } } SSL_CTX_set_verify( tls_def_ctx, i, tls_opt_require_cert == LDAP_OPT_X_TLS_ALLOW ? tls_verify_ok : tls_verify_cb ); SSL_CTX_set_tmp_rsa_callback( tls_def_ctx, tls_tmp_rsa_cb ); /* SSL_CTX_set_tmp_dh_callback( tls_def_ctx, tls_tmp_dh_cb ); */ } #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex ); #endif return 0; error_exit: if ( tls_def_ctx != NULL ) { SSL_CTX_free( tls_def_ctx ); tls_def_ctx = NULL; } #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex ); #endif return -1; } static STACK_OF(X509_NAME) * get_ca_list( char * bundle, char * dir ) { STACK_OF(X509_NAME) *ca_list = NULL; if ( bundle ) { ca_list = SSL_load_client_CA_file( bundle ); } /* * FIXME: We have now to go over all files in dir, load them * and add every certificate there to ca_list. */ return ca_list; } static SSL * alloc_handle( void *ctx_arg ) { SSL_CTX *ctx; SSL *ssl; if ( ctx_arg ) { ctx = (SSL_CTX *) ctx_arg; } else { if ( ldap_pvt_tls_init_def_ctx() < 0 ) return NULL; ctx = tls_def_ctx; } ssl = SSL_new( ctx ); if ( ssl == NULL ) { Debug( LDAP_DEBUG_ANY,"TLS: can't create ssl handle.\n",0,0,0); return NULL; } return ssl; } static int update_flags( Sockbuf *sb, SSL * ssl, int rc ) { int err = SSL_get_error(ssl, rc); sb->sb_trans_needs_read = 0; sb->sb_trans_needs_write = 0; if (err == SSL_ERROR_WANT_READ) { sb->sb_trans_needs_read = 1; return 1; } else if (err == SSL_ERROR_WANT_WRITE) { sb->sb_trans_needs_write = 1; return 1; } else if (err == SSL_ERROR_WANT_CONNECT) { return 1; } return 0; } /* * TLS support for LBER Sockbufs */ struct tls_data { SSL *ssl; Sockbuf_IO_Desc *sbiod; }; static BIO_METHOD sb_tls_bio_method; static int sb_tls_setup( Sockbuf_IO_Desc *sbiod, void *arg ) { struct tls_data *p; BIO *bio; assert( sbiod != NULL ); p = LBER_MALLOC( sizeof( *p ) ); if ( p == NULL ) return -1; p->ssl = (SSL *)arg; p->sbiod = sbiod; bio = BIO_new( &sb_tls_bio_method ); bio->ptr = (void *)p; SSL_set_bio( p->ssl, bio, bio ); sbiod->sbiod_pvt = p; return 0; } static int sb_tls_remove( Sockbuf_IO_Desc *sbiod ) { struct tls_data *p; assert( sbiod != NULL ); assert( sbiod->sbiod_pvt != NULL ); p = (struct tls_data *)sbiod->sbiod_pvt; SSL_free( p->ssl ); LBER_FREE( sbiod->sbiod_pvt ); sbiod->sbiod_pvt = NULL; return 0; } static int sb_tls_close( Sockbuf_IO_Desc *sbiod ) { struct tls_data *p; assert( sbiod != NULL ); assert( sbiod->sbiod_pvt != NULL ); p = (struct tls_data *)sbiod->sbiod_pvt; SSL_shutdown( p->ssl ); return 0; } static int sb_tls_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg ) { struct tls_data *p; assert( sbiod != NULL ); assert( sbiod->sbiod_pvt != NULL ); p = (struct tls_data *)sbiod->sbiod_pvt; if ( opt == LBER_SB_OPT_GET_SSL ) { *((SSL **)arg) = p->ssl; return 1; } else if ( opt == LBER_SB_OPT_DATA_READY ) { if( SSL_pending( p->ssl ) > 0 ) { return 1; } } return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg ); } static ber_slen_t sb_tls_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len) { struct tls_data *p; ber_slen_t ret; int err; assert( sbiod != NULL ); assert( SOCKBUF_VALID( sbiod->sbiod_sb ) ); p = (struct tls_data *)sbiod->sbiod_pvt; ret = SSL_read( p->ssl, (char *)buf, len ); #ifdef HAVE_WINSOCK errno = WSAGetLastError(); #endif err = SSL_get_error( p->ssl, ret ); if (err == SSL_ERROR_WANT_READ ) { sbiod->sbiod_sb->sb_trans_needs_read = 1; errno = EWOULDBLOCK; } else sbiod->sbiod_sb->sb_trans_needs_read = 0; return ret; } static ber_slen_t sb_tls_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len) { struct tls_data *p; ber_slen_t ret; int err; assert( sbiod != NULL ); assert( SOCKBUF_VALID( sbiod->sbiod_sb ) ); p = (struct tls_data *)sbiod->sbiod_pvt; ret = SSL_write( p->ssl, (char *)buf, len ); #ifdef HAVE_WINSOCK errno = WSAGetLastError(); #endif err = SSL_get_error( p->ssl, ret ); if (err == SSL_ERROR_WANT_WRITE ) { sbiod->sbiod_sb->sb_trans_needs_write = 1; errno = EWOULDBLOCK; } else sbiod->sbiod_sb->sb_trans_needs_write = 0; return ret; } static Sockbuf_IO sb_tls_sbio = { sb_tls_setup, /* sbi_setup */ sb_tls_remove, /* sbi_remove */ sb_tls_ctrl, /* sbi_ctrl */ sb_tls_read, /* sbi_read */ sb_tls_write, /* sbi_write */ sb_tls_close /* sbi_close */ }; static int sb_tls_bio_create( BIO *b ) { b->init = 1; b->num = 0; b->ptr = NULL; b->flags = 0; return 1; } static int sb_tls_bio_destroy( BIO *b ) { if ( b == NULL ) return 0; b->ptr = NULL; /* sb_tls_remove() will free it */ b->init = 0; b->flags = 0; return 1; } static int sb_tls_bio_read( BIO *b, char *buf, int len ) { struct tls_data *p; int ret; if ( buf == NULL || len <= 0 ) return 0; p = (struct tls_data *)b->ptr; if ( p == NULL || p->sbiod == NULL ) return 0; ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len ); BIO_clear_retry_flags( b ); if ( ret < 0 && errno == EWOULDBLOCK ) BIO_set_retry_read( b ); return ret; } static int sb_tls_bio_write( BIO *b, const char *buf, int len ) { struct tls_data *p; int ret; if ( buf == NULL || len <= 0 ) return 0; p = (struct tls_data *)b->ptr; if ( p == NULL || p->sbiod == NULL ) return 0; ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len ); BIO_clear_retry_flags( b ); if ( ret < 0 && errno == EWOULDBLOCK ) BIO_set_retry_write( b ); return ret; } static long sb_tls_bio_ctrl( BIO *b, int cmd, long num, void *ptr ) { if ( cmd == BIO_CTRL_FLUSH ) { /* The OpenSSL library needs this */ return 1; } return 0; } static int sb_tls_bio_gets( BIO *b, char *buf, int len ) { return -1; } static int sb_tls_bio_puts( BIO *b, const char *str ) { return sb_tls_bio_write( b, str, strlen( str ) ); } static BIO_METHOD sb_tls_bio_method = { ( 100 | 0x400 ), /* it's a source/sink BIO */ "sockbuf glue", sb_tls_bio_write, sb_tls_bio_read, sb_tls_bio_puts, sb_tls_bio_gets, sb_tls_bio_ctrl, sb_tls_bio_create, sb_tls_bio_destroy }; /* * Call this to do a TLS connect on a sockbuf. ctx_arg can be * a SSL_CTX * or NULL, in which case the default ctx is used. * * Return value: * * 0 - Success. Connection is ready for communication. * <0 - Error. Can't create a TLS stream. * >0 - Partial success. * Do a select (using information from lber_pvt_sb_needs_{read,write} * and call again. */ static int ldap_int_tls_connect( LDAP *ld, LDAPConn *conn ) { Sockbuf *sb = conn->lconn_sb; int err; SSL *ssl; if ( HAS_TLS( sb ) ) { ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl ); } else { void *ctx = ld->ld_defconn ? ld->ld_defconn->lconn_tls_ctx : NULL; ssl = alloc_handle( ctx ); if ( ssl == NULL ) return -1; #ifdef LDAP_DEBUG ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug, LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" ); #endif ber_sockbuf_add_io( sb, &sb_tls_sbio, LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl ); if( ctx == NULL ) { conn->lconn_tls_ctx = tls_def_ctx; } } err = SSL_connect( ssl ); #ifdef HAVE_WINSOCK errno = WSAGetLastError(); #endif if ( err <= 0 ) { if ( update_flags( sb, ssl, err )) { return 1; } if ((err = ERR_peek_error())) { char buf[256]; ld->ld_error = LDAP_STRDUP(ERR_error_string(err, buf)); } Debug( LDAP_DEBUG_ANY,"TLS: can't connect.\n",0,0,0); ber_sockbuf_remove_io( sb, &sb_tls_sbio, LBER_SBIOD_LEVEL_TRANSPORT ); #ifdef LDAP_DEBUG ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug, LBER_SBIOD_LEVEL_TRANSPORT ); #endif return -1; } return 0; } /* * Call this to do a TLS accept on a sockbuf. * Everything else is the same as with tls_connect. */ int ldap_pvt_tls_accept( Sockbuf *sb, void *ctx_arg ) { int err; SSL *ssl; if ( HAS_TLS( sb ) ) { ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl ); } else { ssl = alloc_handle( ctx_arg ); if ( ssl == NULL ) return -1; #ifdef LDAP_DEBUG ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug, LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" ); #endif ber_sockbuf_add_io( sb, &sb_tls_sbio, LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl ); } err = SSL_accept( ssl ); #ifdef HAVE_WINSOCK errno = WSAGetLastError(); #endif if ( err <= 0 ) { if ( update_flags( sb, ssl, err )) return 1; Debug( LDAP_DEBUG_ANY,"TLS: can't accept.\n",0,0,0 ); tls_report_error(); ber_sockbuf_remove_io( sb, &sb_tls_sbio, LBER_SBIOD_LEVEL_TRANSPORT ); #ifdef LDAP_DEBUG ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug, LBER_SBIOD_LEVEL_TRANSPORT ); #endif return -1; } return 0; } int ldap_pvt_tls_inplace ( Sockbuf *sb ) { if ( HAS_TLS( sb ) ) return(1); return(0); } void * ldap_pvt_tls_sb_ctx( Sockbuf *sb ) { void *p; if (HAS_TLS( sb )) { ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&p ); return p; } return NULL; } int ldap_pvt_tls_get_strength( void *s ) { SSL_CIPHER *c; c = SSL_get_current_cipher((SSL *)s); return SSL_CIPHER_get_bits(c, NULL); } static X509 * tls_get_cert( SSL *s ) { /* If peer cert was bad, treat as if no cert was given */ if (SSL_get_verify_result(s)) { /* If we can send an alert, do so */ if (SSL_version(s) != SSL2_VERSION) { ssl3_send_alert(s,SSL3_AL_WARNING,SSL3_AD_BAD_CERTIFICATE); } return NULL; } return SSL_get_peer_certificate(s); } char * ldap_pvt_tls_get_peer( void *s ) { X509 *x; X509_NAME *xn; char buf[2048], *p; x = tls_get_cert((SSL *)s); if (!x) return NULL; xn = X509_get_subject_name(x); p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf))); X509_free(x); return p; } char * ldap_pvt_tls_get_peer_dn( void *s ) { X509 *x; X509_NAME *xn; char buf[2048], *p, *dn; x = tls_get_cert((SSL *)s); if (!x) return NULL; xn = X509_get_subject_name(x); p = X509_NAME_oneline(xn, buf, sizeof(buf)); dn = ldap_dcedn2dn( p ); X509_free(x); return dn; } char * ldap_pvt_tls_get_peer_hostname( void *s ) { X509 *x; X509_NAME *xn; char buf[2048], *p; int ret; x = tls_get_cert((SSL *)s); if (!x) return NULL; xn = X509_get_subject_name(x); ret = X509_NAME_get_text_by_NID(xn, NID_commonName, buf, sizeof(buf)); if( ret == -1 ) { X509_free(x); return NULL; } p = LDAP_STRDUP(buf); X509_free(x); return p; } int ldap_pvt_tls_check_hostname( void *s, const char *name_in ) { int i, ret = LDAP_LOCAL_ERROR; X509 *x; const char *name; if( ldap_int_hostname && ( !name_in || !strcasecmp( name_in, "localhost" ) ) ) { name = ldap_int_hostname; } else { name = name_in; } x = tls_get_cert((SSL *)s); if (!x) { Debug( LDAP_DEBUG_ANY, "TLS: unable to get peer certificate.\n", 0, 0, 0 ); return ret; } 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, len2; char *domain; GENERAL_NAME *gn; X509V3_EXT_METHOD *method; len1 = strlen(name); n = sk_GENERAL_NAME_num(alt); domain = strchr(name, '.'); if (domain) len2 = len1 - (domain-name); for (i=0; itype == GEN_DNS) { char *sn = ASN1_STRING_data(gn->d.ia5); int sl = ASN1_STRING_length(gn->d.ia5); /* Is this an exact match? */ if ((len1 == sl) && !strncasecmp(name, sn, len1)) break; /* Is this a wildcard match? */ if ((*sn == '*') && domain && (len2 == sl-1) && !strncasecmp(domain, sn+1, len2)) break; } } method = X509V3_EXT_get(ex); method->ext_free(alt); if (i < n) /* Found a match */ ret = LDAP_SUCCESS; } } if (ret != LDAP_SUCCESS) { X509_NAME *xn; char buf[2048]; 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 ); } else if (strcasecmp(name, buf)) { Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match " "common name in certificate (%s).\n", name, buf, 0 ); ret = LDAP_CONNECT_ERROR; } else { ret = LDAP_SUCCESS; } } X509_free(x); return ret; } const char * ldap_pvt_tls_get_peer_issuer( void *s ) { #if 0 /* currently unused; see ldap_pvt_tls_get_peer() if needed */ X509 *x; X509_NAME *xn; char buf[2048], *p; x = SSL_get_peer_certificate((SSL *)s); if (!x) return NULL; xn = X509_get_issuer_name(x); p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf))); X509_free(x); return p; #else return NULL; #endif } int ldap_int_tls_config( LDAP *ld, int option, const char *arg ) { int i; switch( option ) { case LDAP_OPT_X_TLS_CACERTFILE: case LDAP_OPT_X_TLS_CACERTDIR: case LDAP_OPT_X_TLS_CERTFILE: case LDAP_OPT_X_TLS_KEYFILE: case LDAP_OPT_X_TLS_RANDOM_FILE: return ldap_pvt_tls_set_option( ld, option, (void *) arg ); case LDAP_OPT_X_TLS_REQUIRE_CERT: case LDAP_OPT_X_TLS: i = -1; if ( strcasecmp( arg, "never" ) == 0 ) i = LDAP_OPT_X_TLS_NEVER ; if ( strcasecmp( arg, "demand" ) == 0 ) i = LDAP_OPT_X_TLS_DEMAND ; if ( strcasecmp( arg, "allow" ) == 0 ) i = LDAP_OPT_X_TLS_ALLOW ; if ( strcasecmp( arg, "try" ) == 0 ) i = LDAP_OPT_X_TLS_TRY ; if ( ( strcasecmp( arg, "hard" ) == 0 ) || ( strcasecmp( arg, "on" ) == 0 ) || ( strcasecmp( arg, "yes" ) == 0) || ( strcasecmp( arg, "true" ) == 0 ) ) i = LDAP_OPT_X_TLS_HARD ; if (i >= 0) { return ldap_pvt_tls_set_option( ld, option, &i ); } return -1; } return -1; } int ldap_pvt_tls_get_option( LDAP *ld, int option, void *arg ) { struct ldapoptions *lo; if( ld != NULL ) { assert( LDAP_VALID( ld ) ); if( !LDAP_VALID( ld ) ) { return LDAP_OPT_ERROR; } lo = &ld->ld_options; } else { /* Get pointer to global option structure */ lo = LDAP_INT_GLOBAL_OPT(); if ( lo == NULL ) { return LDAP_NO_MEMORY; } } switch( option ) { case LDAP_OPT_X_TLS: *(int *)arg = lo->ldo_tls_mode; break; case LDAP_OPT_X_TLS_CTX: if ( ld == NULL ) *(void **)arg = (void *) tls_def_ctx; else *(void **)arg = ld->ld_defconn->lconn_tls_ctx; break; case LDAP_OPT_X_TLS_CACERTFILE: *(char **)arg = tls_opt_cacertfile ? LDAP_STRDUP( tls_opt_cacertfile ) : NULL; break; case LDAP_OPT_X_TLS_CACERTDIR: *(char **)arg = tls_opt_cacertdir ? LDAP_STRDUP( tls_opt_cacertdir ) : NULL; break; case LDAP_OPT_X_TLS_CERTFILE: *(char **)arg = tls_opt_certfile ? LDAP_STRDUP( tls_opt_certfile ) : NULL; break; case LDAP_OPT_X_TLS_KEYFILE: *(char **)arg = tls_opt_keyfile ? LDAP_STRDUP( tls_opt_keyfile ) : NULL; break; case LDAP_OPT_X_TLS_REQUIRE_CERT: *(int *)arg = tls_opt_require_cert; break; case LDAP_OPT_X_TLS_RANDOM_FILE: *(char **)arg = tls_opt_randfile ? LDAP_STRDUP( tls_opt_randfile ) : NULL; break; case LDAP_OPT_X_TLS_SSL_CTX: { void *retval = 0; if ( ld != NULL ) { LDAPConn *conn = ld->ld_defconn; if ( conn != NULL ) { Sockbuf *sb = conn->lconn_sb; retval = ldap_pvt_tls_sb_ctx( sb ); } } *(void **)arg = retval; break; } default: return -1; } return 0; } int ldap_pvt_tls_set_option( LDAP *ld, int option, void *arg ) { struct ldapoptions *lo; if( ld != NULL ) { assert( LDAP_VALID( ld ) ); if( !LDAP_VALID( ld ) ) { return LDAP_OPT_ERROR; } lo = &ld->ld_options; } else { /* Get pointer to global option structure */ lo = LDAP_INT_GLOBAL_OPT(); if ( lo == NULL ) { return LDAP_NO_MEMORY; } } switch( option ) { case LDAP_OPT_X_TLS: switch( *(int *) arg ) { case LDAP_OPT_X_TLS_NEVER: case LDAP_OPT_X_TLS_DEMAND: case LDAP_OPT_X_TLS_ALLOW: case LDAP_OPT_X_TLS_TRY: case LDAP_OPT_X_TLS_HARD: if (lo != NULL) { lo->ldo_tls_mode = *(int *)arg; } return 0; } return -1; case LDAP_OPT_X_TLS_CTX: if ( ld == NULL ) { tls_def_ctx = (SSL_CTX *) arg; } else { ld->ld_defconn->lconn_tls_ctx = arg; } return 0; } if ( ld != NULL ) { return -1; } switch( option ) { case LDAP_OPT_X_TLS_CACERTFILE: if ( tls_opt_cacertfile ) LDAP_FREE( tls_opt_cacertfile ); tls_opt_cacertfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL; break; case LDAP_OPT_X_TLS_CACERTDIR: if ( tls_opt_cacertdir ) LDAP_FREE( tls_opt_cacertdir ); tls_opt_cacertdir = arg ? LDAP_STRDUP( (char *) arg ) : NULL; break; case LDAP_OPT_X_TLS_CERTFILE: if ( tls_opt_certfile ) LDAP_FREE( tls_opt_certfile ); tls_opt_certfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL; break; case LDAP_OPT_X_TLS_KEYFILE: if ( tls_opt_keyfile ) LDAP_FREE( tls_opt_keyfile ); tls_opt_keyfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL; break; case LDAP_OPT_X_TLS_REQUIRE_CERT: switch( *(int *) arg ) { case LDAP_OPT_X_TLS_NEVER: case LDAP_OPT_X_TLS_DEMAND: case LDAP_OPT_X_TLS_ALLOW: case LDAP_OPT_X_TLS_TRY: case LDAP_OPT_X_TLS_HARD: tls_opt_require_cert = * (int *) arg; return 0; } return -1; case LDAP_OPT_X_TLS_CIPHER_SUITE: if ( tls_opt_ciphersuite ) LDAP_FREE( tls_opt_ciphersuite ); tls_opt_ciphersuite = arg ? LDAP_STRDUP( (char *) arg ) : NULL; break; case LDAP_OPT_X_TLS_RANDOM_FILE: if (tls_opt_randfile ) LDAP_FREE (tls_opt_randfile ); tls_opt_randfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL; break; default: return -1; } return 0; } int ldap_int_tls_start ( LDAP *ld, LDAPConn *conn, LDAPURLDesc *srv ) { Sockbuf *sb = conn->lconn_sb; char *host; void *ssl; if( srv ) { host = srv->lud_host; } else { host = conn->lconn_server->lud_host; } /* avoid NULL host */ if( host == NULL ) { host = "localhost"; } (void) ldap_pvt_tls_init(); /* * Fortunately, the lib uses blocking io... */ if ( ldap_int_tls_connect( ld, conn ) < 0 ) { ld->ld_errno = LDAP_CONNECT_ERROR; return (ld->ld_errno); } ssl = (void *) ldap_pvt_tls_sb_ctx( sb ); assert( ssl != NULL ); /* * compare host with name(s) in certificate */ ld->ld_errno = ldap_pvt_tls_check_hostname( ssl, host ); if (ld->ld_errno != LDAP_SUCCESS) { return ld->ld_errno; } /* * set SASL properties to TLS ssf and authid */ { const char *authid; ber_len_t ssf; /* we need to let SASL know */ ssf = ldap_pvt_tls_get_strength( ssl ); authid = ldap_pvt_tls_get_peer( ssl ); (void) ldap_int_sasl_external( ld, conn, authid, ssf ); } return LDAP_SUCCESS; } /* Derived from openssl/apps/s_cb.c */ static void tls_info_cb( SSL *ssl, int where, int ret ) { int w; char *op; 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"; } if ( where & SSL_CB_LOOP ) { Debug( LDAP_DEBUG_TRACE, "TLS trace: %s:%s\n", op, SSL_state_string_long( ssl ), 0 ); } else if ( where & SSL_CB_ALERT ) { op = ( where & SSL_CB_READ ) ? "read" : "write"; Debug( LDAP_DEBUG_TRACE, "TLS trace: SSL3 alert %s:%s:%s\n", op, SSL_alert_type_string_long( ret ), SSL_alert_desc_string_long( ret) ); } else if ( where & SSL_CB_EXIT ) { if ( ret == 0 ) { Debug( LDAP_DEBUG_TRACE, "TLS trace: %s:failed in %s\n", op, SSL_state_string_long( ssl ), 0 ); } else if ( ret < 0 ) { Debug( LDAP_DEBUG_TRACE, "TLS trace: %s:error in %s\n", op, SSL_state_string_long( ssl ), 0 ); } } } static int tls_verify_cb( int ok, X509_STORE_CTX *ctx ) { X509 *cert; int errnum; int errdepth; X509_NAME *subject; X509_NAME *issuer; char *sname; char *iname; 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 ); 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 ( sname ) CRYPTO_free ( sname ); if ( iname ) CRYPTO_free ( iname ); return ok; } static int tls_verify_ok( int ok, X509_STORE_CTX *ctx ) { (void) tls_verify_cb( ok, ctx ); return 1; } /* Inspired by ERR_print_errors in OpenSSL */ static void tls_report_error( void ) { unsigned long l; char buf[200]; const char *file; int line; while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) { Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n", ERR_error_string( l, buf ), file, line ); } } static RSA * tls_tmp_rsa_cb( SSL *ssl, int is_export, int key_length ) { RSA *tmp_rsa; /* FIXME: Pregenerate the key on startup */ /* FIXME: Who frees the key? */ tmp_rsa = RSA_generate_key( key_length, RSA_F4, NULL, NULL ); if ( !tmp_rsa ) { Debug( LDAP_DEBUG_ANY, "TLS: Failed to generate temporary %d-bit %s RSA key\n", key_length, is_export ? "export" : "domestic", 0 ); return NULL; } return tmp_rsa; } static int tls_seed_PRNG( const char *randfile ) { #ifndef URANDOM_DEVICE /* no /dev/urandom (or equiv) */ long total=0; char buffer[MAXPATHLEN]; if (randfile == NULL) { /* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd. * If $HOME is not set or buffer too small to hold the pathname, * an error occurs. - From RAND_file_name() man page. * The fact is that when $HOME is NULL, .rnd is used. */ randfile = RAND_file_name( buffer, sizeof( buffer ) ); } else if (RAND_egd(randfile) > 0) { /* EGD socket */ return 0; } if (randfile == NULL) { Debug( LDAP_DEBUG_ANY, "TLS: Use configuration file or $RANDFILE to define seed PRNG\n", 0, 0, 0); return -1; } total = RAND_load_file(randfile, -1); if (RAND_status() == 0) { Debug( LDAP_DEBUG_ANY, "TLS: PRNG not been seeded with enough data\n", 0, 0, 0); return -1; } /* assume if there was enough bits to seed that it's okay * to write derived bits to the file */ RAND_write_file(randfile); #endif return 0; } #if 0 static DH * tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length ) { return NULL; } #endif #endif int ldap_start_tls_s ( LDAP *ld, LDAPControl **serverctrls, LDAPControl **clientctrls ) { int rc; #ifdef HAVE_TLS char *rspoid = NULL; struct berval *rspdata = NULL; /* XXYYZ: this initiates operation only on default connection! */ if ( ld->ld_sb != NULL && ldap_pvt_tls_inplace( ld->ld_sb ) != 0 ) { return LDAP_LOCAL_ERROR; } rc = ldap_extended_operation_s( ld, LDAP_EXOP_START_TLS, NULL, serverctrls, clientctrls, &rspoid, &rspdata ); if ( rc != LDAP_SUCCESS ) { return rc; } if ( rspoid != NULL ) { LDAP_FREE(rspoid); } if ( rspdata != NULL ) { ber_bvfree( rspdata ); } rc = ldap_int_tls_start( ld, ld->ld_defconn, NULL ); #else rc = LDAP_NOT_SUPPORTED; #endif return rc; }