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Diffstat (limited to '')
| -rw-r--r-- | libraries/libldap/tls_o.c | 1291 |
1 files changed, 1291 insertions, 0 deletions
diff --git a/libraries/libldap/tls_o.c b/libraries/libldap/tls_o.c new file mode 100644 index 0000000..b0277df --- /dev/null +++ b/libraries/libldap/tls_o.c @@ -0,0 +1,1291 @@ +/* tls_o.c - Handle tls/ssl using OpenSSL */ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 2008-2018 The OpenLDAP Foundation. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted only as authorized by the OpenLDAP + * Public License. + * + * A copy of this license is available in the file LICENSE in the + * top-level directory of the distribution or, alternatively, at + * <http://www.OpenLDAP.org/license.html>. + */ +/* ACKNOWLEDGEMENTS: Rewritten by Howard Chu + */ + +#include "portable.h" + +#ifdef HAVE_OPENSSL + +#include "ldap_config.h" + +#include <stdio.h> + +#include <ac/stdlib.h> +#include <ac/errno.h> +#include <ac/socket.h> +#include <ac/string.h> +#include <ac/ctype.h> +#include <ac/time.h> +#include <ac/unistd.h> +#include <ac/param.h> +#include <ac/dirent.h> + +#include "ldap-int.h" +#include "ldap-tls.h" + +#ifdef HAVE_OPENSSL_SSL_H +#include <openssl/ssl.h> +#include <openssl/x509v3.h> +#include <openssl/err.h> +#include <openssl/rand.h> +#include <openssl/safestack.h> +#include <openssl/bn.h> +#include <openssl/rsa.h> +#include <openssl/dh.h> +#elif defined( HAVE_SSL_H ) +#include <ssl.h> +#endif + +#if OPENSSL_VERSION_NUMBER >= 0x10100000 +#define ASN1_STRING_data(x) ASN1_STRING_get0_data(x) +#endif + +typedef SSL_CTX tlso_ctx; +typedef SSL tlso_session; + +static BIO_METHOD * tlso_bio_method = NULL; +static BIO_METHOD * tlso_bio_setup( void ); + +static int tlso_opt_trace = 1; + +static void tlso_report_error( void ); + +static void tlso_info_cb( const SSL *ssl, int where, int ret ); +static int tlso_verify_cb( int ok, X509_STORE_CTX *ctx ); +static int tlso_verify_ok( int ok, X509_STORE_CTX *ctx ); +static int tlso_seed_PRNG( const char *randfile ); +#if OPENSSL_VERSION_NUMBER < 0x10100000 +/* + * OpenSSL 1.1 API and later has new locking code +*/ +static RSA * tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length ); + +#ifdef LDAP_R_COMPILE +/* + * provide mutexes for the OpenSSL library. + */ +static ldap_pvt_thread_mutex_t tlso_mutexes[CRYPTO_NUM_LOCKS]; + +static void tlso_locking_cb( int mode, int type, const char *file, int line ) +{ + if ( mode & CRYPTO_LOCK ) { + ldap_pvt_thread_mutex_lock( &tlso_mutexes[type] ); + } else { + ldap_pvt_thread_mutex_unlock( &tlso_mutexes[type] ); + } +} + +static unsigned long tlso_thread_self( void ) +{ + /* FIXME: CRYPTO_set_id_callback only works when ldap_pvt_thread_t + * is an integral type that fits in an unsigned long + */ + + /* force an error if the ldap_pvt_thread_t type is too large */ + enum { ok = sizeof( ldap_pvt_thread_t ) <= sizeof( unsigned long ) }; + typedef struct { int dummy: ok ? 1 : -1; } Check[ok ? 1 : -1]; + + return (unsigned long) ldap_pvt_thread_self(); +} + +static void tlso_thr_init( void ) +{ + int i; + + for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) { + ldap_pvt_thread_mutex_init( &tlso_mutexes[i] ); + } + 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 ( lo->ldo_tls_dhfile ) { + DH *dh = NULL; + BIO *bio; + SSL_CTX_set_options( ctx, SSL_OP_SINGLE_DH_USE ); + + 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 ); + } + + 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 */ + return SSL_connect( s ) - 1; +} + +static int +tlso_session_accept( tls_session *sess ) +{ + tlso_session *s = (tlso_session *)sess; + + /* Caller expects 0 = success, OpenSSL returns 1 = success */ + return SSL_accept( s ) - 1; +} + +static int +tlso_session_upflags( Sockbuf *sb, tls_session *sess, int rc ) +{ + tlso_session *s = (tlso_session *)sess; + + /* 1 was subtracted above, offset it back now */ + rc = SSL_get_error(s, rc+1); + if (rc == SSL_ERROR_WANT_READ) { + sb->sb_trans_needs_read = 1; + return 1; + + } else if (rc == SSL_ERROR_WANT_WRITE) { + sb->sb_trans_needs_write = 1; + return 1; + + } else if (rc == SSL_ERROR_WANT_CONNECT) { + return 1; + } + return 0; +} + +static char * +tlso_session_errmsg( 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; i<n; i++) { + char *sn; + int sl; + gn = sk_GENERAL_NAME_value(alt, i); + if (gn->type == GEN_DNS) { + if (ntype != IS_DNS) continue; + + sn = (char *) ASN1_STRING_data(gn->d.ia5); + sl = ASN1_STRING_length(gn->d.ia5); + + /* ignore empty */ + if (sl == 0) continue; + + /* Is this an exact match? */ + if ((nlen == sl) && !strncasecmp(name, sn, nlen)) { + break; + } + + /* Is this a wildcard match? */ + if (domain && (sn[0] == '*') && (sn[1] == '.') && + (len2 == sl-1) && !strncasecmp(domain, &sn[1], len2)) + { + break; + } + + } else if (gn->type == GEN_IPADD) { + if (ntype == IS_DNS) continue; + + sn = (char *) ASN1_STRING_data(gn->d.ia5); + sl = ASN1_STRING_length(gn->d.ia5); + +#ifdef LDAP_PF_INET6 + if (ntype == IS_IP6 && sl != sizeof(struct in6_addr)) { + continue; + } else +#endif + if (ntype == IS_IP4 && sl != sizeof(struct in_addr)) { + continue; + } + if (!memcmp(sn, &addr, sl)) { + break; + } + } + } + + GENERAL_NAMES_free(alt); + if (i < n) { /* Found a match */ + ret = LDAP_SUCCESS; + } + } + } + + if (ret != LDAP_SUCCESS) { + 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 */ |