/* tls.c - Handle tls/ssl using SSLeay or OpenSSL. */ /* $OpenLDAP$ */ /* This work is part of OpenLDAP Software . * * Copyright 1998-2007 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 * . */ #include "portable.h" #include "ldap_config.h" #include #include #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_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( const 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 ); static DH * tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length ); typedef struct dhplist { struct dhplist *next; int keylength; DH *param; } dhplist; static dhplist *dhparams; 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 ldap_pvt_thread_mutex_t tls_connect_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 ); CRYPTO_set_id_callback( ldap_pvt_thread_self ); /* FIXME: CRYPTO_set_id_callback only works when ldap_pvt_thread_t * is an integral type that fits in an unsigned long */ ldap_pvt_thread_mutex_init( &tls_def_ctx_mutex ); ldap_pvt_thread_mutex_init( &tls_connect_mutex ); } #endif /* LDAP_R_COMPILE */ void ldap_int_tls_destroy( struct ldapoptions *lo ) { if ( lo->ldo_tls_ctx ) { SSL_CTX_free( lo->ldo_tls_ctx ); lo->ldo_tls_ctx = NULL; } if ( lo->ldo_tls_certfile ) { LDAP_FREE( lo->ldo_tls_certfile ); lo->ldo_tls_certfile = NULL; } if ( lo->ldo_tls_keyfile ) { LDAP_FREE( lo->ldo_tls_keyfile ); lo->ldo_tls_keyfile = NULL; } if ( lo->ldo_tls_dhfile ) { LDAP_FREE( lo->ldo_tls_dhfile ); lo->ldo_tls_dhfile = NULL; } if ( lo->ldo_tls_cacertfile ) { LDAP_FREE( lo->ldo_tls_cacertfile ); lo->ldo_tls_cacertfile = NULL; } if ( lo->ldo_tls_cacertdir ) { LDAP_FREE( lo->ldo_tls_cacertdir ); lo->ldo_tls_cacertdir = NULL; } if ( lo->ldo_tls_ciphersuite ) { LDAP_FREE( lo->ldo_tls_ciphersuite ); lo->ldo_tls_ciphersuite = NULL; } } /* * Tear down the TLS subsystem. Should only be called once. */ void ldap_pvt_tls_destroy( void ) { struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT(); ldap_int_tls_destroy( lo ); EVP_cleanup(); ERR_remove_state(0); ERR_free_strings(); 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; #ifdef HAVE_EBCDIC { char *file = LDAP_STRDUP( tls_opt_randfile ); if ( file ) __atoe( file ); (void) tls_seed_PRNG( file ); LDAP_FREE( file ); } #else (void) tls_seed_PRNG( tls_opt_randfile ); #endif #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 a new TLS context */ static int ldap_int_tls_init_ctx( struct ldapoptions *lo, int is_server ) { STACK_OF(X509_NAME) *calist; int i, rc = 0; char *ciphersuite = lo->ldo_tls_ciphersuite; char *cacertfile = lo->ldo_tls_cacertfile; char *cacertdir = lo->ldo_tls_cacertdir; char *certfile = lo->ldo_tls_certfile; char *keyfile = lo->ldo_tls_keyfile; char *dhfile = lo->ldo_tls_dhfile; if ( lo->ldo_tls_ctx ) return 0; ldap_pvt_tls_init(); if ( is_server && !certfile && !keyfile && !cacertfile && !cacertdir ) { /* minimum configuration not provided */ return LDAP_NOT_SUPPORTED; } #ifdef HAVE_EBCDIC /* This ASCII/EBCDIC handling is a real pain! */ if ( ciphersuite ) { ciphersuite = LDAP_STRDUP( ciphersuite ); __atoe( ciphersuite ); } if ( cacertfile ) { cacertfile = LDAP_STRDUP( cacertfile ); __atoe( cacertfile ); } if ( cacertdir ) { cacertdir = LDAP_STRDUP( cacertdir ); __atoe( cacertdir ); } if ( certfile ) { certfile = LDAP_STRDUP( certfile ); __atoe( certfile ); } if ( keyfile ) { keyfile = LDAP_STRDUP( keyfile ); __atoe( keyfile ); } if ( dhfile ) { dhfile = LDAP_STRDUP( dhfile ); __atoe( dhfile ); } #endif lo->ldo_tls_ctx = SSL_CTX_new( SSLv23_method() ); if ( lo->ldo_tls_ctx == NULL ) { Debug( LDAP_DEBUG_ANY, "TLS: could not allocate default ctx (%lu).\n", ERR_peek_error(),0,0); rc = -1; goto error_exit; } if ( is_server ) { SSL_CTX_set_session_id_context( lo->ldo_tls_ctx, (const unsigned char *) "OpenLDAP", sizeof("OpenLDAP")-1 ); } if ( lo->ldo_tls_ciphersuite && !SSL_CTX_set_cipher_list( lo->ldo_tls_ctx, ciphersuite ) ) { Debug( LDAP_DEBUG_ANY, "TLS: could not set cipher list %s.\n", lo->ldo_tls_ciphersuite, 0, 0 ); tls_report_error(); rc = -1; goto error_exit; } if (lo->ldo_tls_cacertfile != NULL || lo->ldo_tls_cacertdir != NULL) { if ( !SSL_CTX_load_verify_locations( lo->ldo_tls_ctx, cacertfile, cacertdir ) || !SSL_CTX_set_default_verify_paths( lo->ldo_tls_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 ); tls_report_error(); rc = -1; goto error_exit; } if ( is_server ) { /* List of CA names to send to a client */ calist = get_ca_list( cacertfile, 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 ); tls_report_error(); rc = -1; goto error_exit; } SSL_CTX_set_client_CA_list( lo->ldo_tls_ctx, calist ); } } if ( lo->ldo_tls_certfile && !SSL_CTX_use_certificate_file( lo->ldo_tls_ctx, certfile, SSL_FILETYPE_PEM ) ) { Debug( LDAP_DEBUG_ANY, "TLS: could not use certificate `%s'.\n", lo->ldo_tls_certfile,0,0); tls_report_error(); rc = -1; goto error_exit; } /* Key validity is checked automatically if cert has already been set */ if ( lo->ldo_tls_keyfile && !SSL_CTX_use_PrivateKey_file( lo->ldo_tls_ctx, keyfile, SSL_FILETYPE_PEM ) ) { Debug( LDAP_DEBUG_ANY, "TLS: could not use key file `%s'.\n", lo->ldo_tls_keyfile,0,0); tls_report_error(); rc = -1; goto error_exit; } if ( lo->ldo_tls_dhfile ) { DH *dh = NULL; BIO *bio; dhplist *p; if (( bio=BIO_new_file( dhfile,"r" )) == NULL ) { Debug( LDAP_DEBUG_ANY, "TLS: could not use DH parameters file `%s'.\n", lo->ldo_tls_dhfile,0,0); tls_report_error(); rc = -1; goto error_exit; } 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 = dhparams; dhparams = p; } } BIO_free( bio ); } if ( tls_opt_trace ) { SSL_CTX_set_info_callback( (SSL_CTX *)lo->ldo_tls_ctx, tls_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( lo->ldo_tls_ctx, i, lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ? tls_verify_ok : tls_verify_cb ); SSL_CTX_set_tmp_rsa_callback( lo->ldo_tls_ctx, tls_tmp_rsa_cb ); if ( lo->ldo_tls_dhfile ) { SSL_CTX_set_tmp_dh_callback( lo->ldo_tls_ctx, tls_tmp_dh_cb ); } #ifdef HAVE_OPENSSL_CRL if ( lo->ldo_tls_crlcheck ) { X509_STORE *x509_s = SSL_CTX_get_cert_store( lo->ldo_tls_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 error_exit: if ( rc == -1 && lo->ldo_tls_ctx != NULL ) { SSL_CTX_free( lo->ldo_tls_ctx ); lo->ldo_tls_ctx = NULL; } #ifdef HAVE_EBCDIC LDAP_FREE( ciphersuite ); LDAP_FREE( cacertfile ); LDAP_FREE( cacertdir ); LDAP_FREE( certfile ); LDAP_FREE( keyfile ); LDAP_FREE( dhfile ); #endif return rc; } /* * initialize the default context */ int ldap_pvt_tls_init_def_ctx( int is_server ) { struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT(); int rc; #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_lock( &tls_def_ctx_mutex ); #endif rc = ldap_int_tls_init_ctx( lo, is_server ); #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex ); #endif return rc; } 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 ); } #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; } static SSL * alloc_handle( void *ctx_arg, int is_server ) { SSL_CTX *ctx; SSL *ssl; if ( ctx_arg ) { ctx = (SSL_CTX *) ctx_arg; } else { struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT(); if ( ldap_pvt_tls_init_def_ctx( is_server ) < 0 ) return NULL; ctx = lo->ldo_tls_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; sock_errset(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; sock_errset(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 ) { int err = sock_errno(); if ( err == EAGAIN || err == 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 ) { int err = sock_errno(); if ( err == EAGAIN || err == 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 { struct ldapoptions *lo; SSL_CTX *ctx; ctx = ld->ld_options.ldo_tls_ctx; ssl = alloc_handle( ctx, 0 ); 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 ); lo = LDAP_INT_GLOBAL_OPT(); if( ctx == NULL ) { ctx = lo->ldo_tls_ctx; ld->ld_options.ldo_tls_ctx = ctx; CRYPTO_add( &ctx->references, 1, CRYPTO_LOCK_SSL_CTX ); } if ( ld->ld_options.ldo_tls_connect_cb ) ld->ld_options.ldo_tls_connect_cb( ld, ssl, ctx, ld->ld_options.ldo_tls_connect_arg ); if ( lo && lo->ldo_tls_connect_cb && lo->ldo_tls_connect_cb != ld->ld_options.ldo_tls_connect_cb ) lo->ldo_tls_connect_cb( ld, ssl, ctx, lo->ldo_tls_connect_arg ); } 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]; if ( ld->ld_error ) { LDAP_FREE( ld->ld_error ); } ld->ld_error = LDAP_STRDUP(ERR_error_string(err, buf)); #ifdef HAVE_EBCDIC if ( ld->ld_error ) __etoa(ld->ld_error); #endif } Debug( LDAP_DEBUG_ANY,"TLS: can't connect: %s.\n", ld->ld_error ? ld->ld_error : "" ,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, 1 ); 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 ); } #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_lock( &tls_connect_mutex ); #endif err = SSL_accept( ssl ); #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_unlock( &tls_connect_mutex ); #endif #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 ) { return HAS_TLS( sb ) ? 1 : 0; } int ldap_tls_inplace( LDAP *ld ) { Sockbuf *sb = NULL; if ( ld->ld_defconn && ld->ld_defconn->lconn_sb ) { sb = ld->ld_defconn->lconn_sb; } else if ( ld->ld_sb ) { sb = ld->ld_sb; } else { return 0; } return ldap_pvt_tls_inplace( sb ); } 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); } int ldap_pvt_tls_get_peer_dn( void *s, struct berval *dn, LDAPDN_rewrite_dummy *func, unsigned flags ) { X509 *x; X509_NAME *xn; int rc; x = tls_get_cert((SSL *)s); if (!x) return LDAP_INVALID_CREDENTIALS; xn = X509_get_subject_name(x); rc = ldap_X509dn2bv(xn, dn, (LDAPDN_rewrite_func *)func, flags); X509_free(x); return rc; } 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; } /* what kind of hostname were we given? */ #define IS_DNS 0 #define IS_IP4 1 #define IS_IP6 2 int ldap_pvt_tls_check_hostname( LDAP *ld, void *s, const char *name_in ) { 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 = tls_get_cert((SSL *)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, ']') = 2; 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; 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 ((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; } const char * ldap_pvt_tls_get_peer_issuer( void *s ) { #if 0 /* currently unused; see ldap_pvt_tls_get_peer_dn() 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: case LDAP_OPT_X_TLS_CIPHER_SUITE: case LDAP_OPT_X_TLS_DHFILE: 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 ; } else if ( strcasecmp( arg, "demand" ) == 0 ) { i = LDAP_OPT_X_TLS_DEMAND ; } else if ( strcasecmp( arg, "allow" ) == 0 ) { i = LDAP_OPT_X_TLS_ALLOW ; } else if ( strcasecmp( arg, "try" ) == 0 ) { i = LDAP_OPT_X_TLS_TRY ; } else 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; #ifdef HAVE_OPENSSL_CRL case LDAP_OPT_X_TLS_CRLCHECK: i = -1; if ( strcasecmp( arg, "none" ) == 0 ) { i = LDAP_OPT_X_TLS_CRL_NONE ; } else if ( strcasecmp( arg, "peer" ) == 0 ) { i = LDAP_OPT_X_TLS_CRL_PEER ; } else if ( strcasecmp( arg, "all" ) == 0 ) { i = LDAP_OPT_X_TLS_CRL_ALL ; } if (i >= 0) { return ldap_pvt_tls_set_option( ld, option, &i ); } return -1; #endif } 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: *(void **)arg = lo->ldo_tls_ctx; if ( lo->ldo_tls_ctx ) { SSL_CTX *ctx = lo->ldo_tls_ctx; CRYPTO_add( &ctx->references, 1, CRYPTO_LOCK_SSL_CTX ); } break; case LDAP_OPT_X_TLS_CACERTFILE: *(char **)arg = lo->ldo_tls_cacertfile ? LDAP_STRDUP( lo->ldo_tls_cacertfile ) : NULL; break; case LDAP_OPT_X_TLS_CACERTDIR: *(char **)arg = lo->ldo_tls_cacertdir ? LDAP_STRDUP( lo->ldo_tls_cacertdir ) : NULL; break; case LDAP_OPT_X_TLS_CERTFILE: *(char **)arg = lo->ldo_tls_certfile ? LDAP_STRDUP( lo->ldo_tls_certfile ) : NULL; break; case LDAP_OPT_X_TLS_KEYFILE: *(char **)arg = lo->ldo_tls_keyfile ? LDAP_STRDUP( lo->ldo_tls_keyfile ) : NULL; break; case LDAP_OPT_X_TLS_DHFILE: *(char **)arg = lo->ldo_tls_dhfile ? LDAP_STRDUP( lo->ldo_tls_dhfile ) : NULL; break; case LDAP_OPT_X_TLS_REQUIRE_CERT: *(int *)arg = lo->ldo_tls_require_cert; break; #ifdef HAVE_OPENSSL_CRL case LDAP_OPT_X_TLS_CRLCHECK: *(int *)arg = lo->ldo_tls_crlcheck; break; #endif case LDAP_OPT_X_TLS_CIPHER_SUITE: *(char **)arg = lo->ldo_tls_ciphersuite ? LDAP_STRDUP( lo->ldo_tls_ciphersuite ) : NULL; 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; } case LDAP_OPT_X_TLS_CONNECT_CB: *(LDAP_TLS_CONNECT_CB **)arg = lo->ldo_tls_connect_cb; break; case LDAP_OPT_X_TLS_CONNECT_ARG: *(void **)arg = lo->ldo_tls_connect_arg; 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: if ( !arg ) return -1; 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 ( lo->ldo_tls_ctx ) SSL_CTX_free( lo->ldo_tls_ctx ); lo->ldo_tls_ctx = arg; CRYPTO_add( &((SSL_CTX *)arg)->references, 1, CRYPTO_LOCK_SSL_CTX ); return 0; case LDAP_OPT_X_TLS_CONNECT_CB: lo->ldo_tls_connect_cb = (LDAP_TLS_CONNECT_CB *)arg; return 0; case LDAP_OPT_X_TLS_CONNECT_ARG: lo->ldo_tls_connect_arg = arg; return 0; case LDAP_OPT_X_TLS_CACERTFILE: if ( lo->ldo_tls_cacertfile ) LDAP_FREE( lo->ldo_tls_cacertfile ); lo->ldo_tls_cacertfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL; return 0; case LDAP_OPT_X_TLS_CACERTDIR: if ( lo->ldo_tls_cacertdir ) LDAP_FREE( lo->ldo_tls_cacertdir ); lo->ldo_tls_cacertdir = arg ? LDAP_STRDUP( (char *) arg ) : NULL; return 0; case LDAP_OPT_X_TLS_CERTFILE: if ( lo->ldo_tls_certfile ) LDAP_FREE( lo->ldo_tls_certfile ); lo->ldo_tls_certfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL; return 0; case LDAP_OPT_X_TLS_KEYFILE: if ( lo->ldo_tls_keyfile ) LDAP_FREE( lo->ldo_tls_keyfile ); lo->ldo_tls_keyfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL; return 0; case LDAP_OPT_X_TLS_DHFILE: if ( lo->ldo_tls_dhfile ) LDAP_FREE( lo->ldo_tls_dhfile ); lo->ldo_tls_dhfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL; return 0; case LDAP_OPT_X_TLS_REQUIRE_CERT: if ( !arg ) return -1; 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: lo->ldo_tls_require_cert = * (int *) arg; return 0; } return -1; #ifdef HAVE_OPENSSL_CRL case LDAP_OPT_X_TLS_CRLCHECK: if ( !arg ) return -1; switch( *(int *) arg ) { case LDAP_OPT_X_TLS_CRL_NONE: case LDAP_OPT_X_TLS_CRL_PEER: case LDAP_OPT_X_TLS_CRL_ALL: lo->ldo_tls_crlcheck = * (int *) arg; return 0; } return -1; #endif case LDAP_OPT_X_TLS_CIPHER_SUITE: if ( lo->ldo_tls_ciphersuite ) LDAP_FREE( lo->ldo_tls_ciphersuite ); lo->ldo_tls_ciphersuite = arg ? LDAP_STRDUP( (char *) arg ) : NULL; return 0; case LDAP_OPT_X_TLS_RANDOM_FILE: if ( ld != NULL ) return -1; if (tls_opt_randfile ) LDAP_FREE (tls_opt_randfile ); tls_opt_randfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL; break; case LDAP_OPT_X_TLS_NEWCTX: if ( !arg ) return -1; if ( lo->ldo_tls_ctx ) SSL_CTX_free( lo->ldo_tls_ctx ); lo->ldo_tls_ctx = NULL; return ldap_int_tls_init_ctx( lo, *(int *)arg ); 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 = ldap_pvt_tls_sb_ctx( sb ); assert( ssl != NULL ); /* * compare host with name(s) in certificate */ if (ld->ld_options.ldo_tls_require_cert != LDAP_OPT_X_TLS_NEVER) { ld->ld_errno = ldap_pvt_tls_check_hostname( ld, ssl, host ); if (ld->ld_errno != LDAP_SUCCESS) { return ld->ld_errno; } } return LDAP_SUCCESS; } /* Derived from openssl/apps/s_cb.c */ static void tls_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 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; 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 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 ) { 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 * 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; } struct dhinfo { int keylength; const char *pem; size_t size; }; /* From the OpenSSL 0.9.7 distro */ static const char dhpem512[] = "-----BEGIN DH PARAMETERS-----\n\ MEYCQQDaWDwW2YUiidDkr3VvTMqS3UvlM7gE+w/tlO+cikQD7VdGUNNpmdsp13Yn\n\ a6LT1BLiGPTdHghM9tgAPnxHdOgzAgEC\n\ -----END DH PARAMETERS-----\n"; static const char 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 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 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 dhpem[] = { { 512, dhpem512, sizeof(dhpem512) }, { 1024, dhpem1024, sizeof(dhpem1024) }, { 2048, dhpem2048, sizeof(dhpem2048) }, { 4096, dhpem4096, sizeof(dhpem4096) }, { 0, NULL, 0 } }; static DH * tls_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( &tls_def_ctx_mutex ); #endif for ( p = dhparams; p; p=p->next ) { if ( p->keylength == key_length ) { #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex ); #endif return p->param; } } /* No - check for hardcoded params */ for (i=0; dhpem[i].keylength; i++) { if ( dhpem[i].keylength == key_length ) { b = BIO_new_mem_buf( (char *)dhpem[i].pem, 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 = dhparams; dhparams = p; } } #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex ); #endif return dh; } #endif void * ldap_pvt_tls_sb_ctx( Sockbuf *sb ) { #ifdef HAVE_TLS void *p; if (HAS_TLS( sb )) { ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&p ); return p; } #endif return NULL; } int ldap_pvt_tls_get_strength( void *s ) { #ifdef HAVE_TLS SSL_CIPHER *c; c = SSL_get_current_cipher((SSL *)s); return SSL_CIPHER_get_bits(c, NULL); #else return 0; #endif } int ldap_pvt_tls_get_my_dn( void *s, struct berval *dn, LDAPDN_rewrite_dummy *func, unsigned flags ) { #ifdef HAVE_TLS X509 *x; X509_NAME *xn; int rc; x = SSL_get_certificate((SSL *)s); if (!x) return LDAP_INVALID_CREDENTIALS; xn = X509_get_subject_name(x); rc = ldap_X509dn2bv(xn, dn, (LDAPDN_rewrite_func *)func, flags ); return rc; #else return LDAP_NOT_SUPPORTED; #endif } int ldap_start_tls( LDAP *ld, LDAPControl **serverctrls, LDAPControl **clientctrls, int *msgidp ) { return ldap_extended_operation( ld, LDAP_EXOP_START_TLS, NULL, serverctrls, clientctrls, msgidp ); } int ldap_install_tls( LDAP *ld ) { #ifndef HAVE_TLS return LDAP_NOT_SUPPORTED; #else if ( ldap_tls_inplace( ld ) ) { return LDAP_LOCAL_ERROR; } return ldap_int_tls_start( ld, ld->ld_defconn, NULL ); #endif } int ldap_start_tls_s ( LDAP *ld, LDAPControl **serverctrls, LDAPControl **clientctrls ) { #ifndef HAVE_TLS return LDAP_NOT_SUPPORTED; #else int rc; char *rspoid = NULL; struct berval *rspdata = NULL; /* XXYYZ: this initiates operation only on default connection! */ if ( ldap_tls_inplace( ld ) ) { return LDAP_LOCAL_ERROR; } rc = ldap_extended_operation_s( ld, LDAP_EXOP_START_TLS, NULL, serverctrls, clientctrls, &rspoid, &rspdata ); if ( rspoid != NULL ) { LDAP_FREE(rspoid); } if ( rspdata != NULL ) { ber_bvfree( rspdata ); } if ( rc == LDAP_SUCCESS ) { rc = ldap_int_tls_start( ld, ld->ld_defconn, NULL ); } return rc; #endif }