/* tls_g.c - Handle tls/ssl using GNUTLS. */ /* $OpenLDAP$ */ /* This work is part of OpenLDAP Software . * * Copyright 2008-2009 The OpenLDAP Foundation. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted only as authorized by the OpenLDAP * Public License. * * A copy of this license is available in the file LICENSE in the * top-level directory of the distribution or, alternatively, at * . */ /* ACKNOWLEDGEMENTS: GNUTLS support written by Howard Chu and * Matt Backes; sponsored by The Written Word (thewrittenword.com) * and Stanford University (stanford.edu). */ #include "portable.h" #ifdef HAVE_GNUTLS #include "ldap_config.h" #include #include #include #include #include #include #include #include #include #include #include #include #include "ldap-int.h" #include "ldap-tls.h" #ifdef LDAP_R_COMPILE #include #endif #include #include #include #define DH_BITS (1024) #if LIBGNUTLS_VERSION_NUMBER >= 0x020200 #define HAVE_CIPHERSUITES 1 /* This is a kludge. gcrypt 1.4.x has support. Recent GnuTLS requires gcrypt 1.4.x * but that dependency isn't reflected in their configure script, resulting in * build errors on older gcrypt. So, if they have a working build environment, * assume gcrypt is new enough. */ #define HAVE_GCRYPT_RAND 1 #else #undef HAVE_CIPHERSUITES #undef HAVE_GCRYPT_RAND #endif #ifndef HAVE_CIPHERSUITES /* Versions prior to 2.2.0 didn't handle cipher suites, so we had to * kludge them ourselves. */ typedef struct tls_cipher_suite { const char *name; gnutls_kx_algorithm_t kx; gnutls_cipher_algorithm_t cipher; gnutls_mac_algorithm_t mac; gnutls_protocol_t version; } tls_cipher_suite; #endif typedef struct tlsg_ctx { struct ldapoptions *lo; gnutls_certificate_credentials_t cred; gnutls_dh_params_t dh_params; unsigned long verify_depth; int refcount; #ifdef HAVE_CIPHERSUITES gnutls_priority_t prios; #else int *kx_list; int *cipher_list; int *mac_list; #endif #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_t ref_mutex; #endif } tlsg_ctx; typedef struct tlsg_session { gnutls_session_t session; tlsg_ctx *ctx; struct berval peer_der_dn; } tlsg_session; #ifndef HAVE_CIPHERSUITES static tls_cipher_suite *tlsg_ciphers; static int tlsg_n_ciphers; #endif static int tlsg_parse_ciphers( tlsg_ctx *ctx, char *suites ); static int tlsg_cert_verify( tlsg_session *s ); #ifdef LDAP_R_COMPILE static int tlsg_mutex_init( void **priv ) { int err = 0; ldap_pvt_thread_mutex_t *lock = LDAP_MALLOC( sizeof( ldap_pvt_thread_mutex_t )); if ( !lock ) err = ENOMEM; if ( !err ) { err = ldap_pvt_thread_mutex_init( lock ); if ( err ) LDAP_FREE( lock ); else *priv = lock; } return err; } static int tlsg_mutex_destroy( void **lock ) { int err = ldap_pvt_thread_mutex_destroy( *lock ); LDAP_FREE( *lock ); return err; } static int tlsg_mutex_lock( void **lock ) { return ldap_pvt_thread_mutex_lock( *lock ); } static int tlsg_mutex_unlock( void **lock ) { return ldap_pvt_thread_mutex_unlock( *lock ); } static struct gcry_thread_cbs tlsg_thread_cbs = { GCRY_THREAD_OPTION_USER, NULL, tlsg_mutex_init, tlsg_mutex_destroy, tlsg_mutex_lock, tlsg_mutex_unlock, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }; static void tlsg_thr_init( void ) { gcry_control (GCRYCTL_SET_THREAD_CBS, &tlsg_thread_cbs); } #endif /* LDAP_R_COMPILE */ /* * Initialize TLS subsystem. Should be called only once. */ static int tlsg_init( void ) { #ifdef HAVE_GCRYPT_RAND struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT(); if ( lo->ldo_tls_randfile && gcry_control( GCRYCTL_SET_RNDEGD_SOCKET, lo->ldo_tls_randfile )) { Debug( LDAP_DEBUG_ANY, "TLS: gcry_control GCRYCTL_SET_RNDEGD_SOCKET failed\n", 0, 0, 0); return -1; } #endif gnutls_global_init(); #ifndef HAVE_CIPHERSUITES /* GNUtls cipher suite handling: The library ought to parse suite * names for us, but it doesn't. It will return a list of suite names * that it supports, so we can do parsing ourselves. It ought to tell * us how long the list is, but it doesn't do that either, so we just * have to count it manually... */ { int i = 0; tls_cipher_suite *ptr, tmp; char cs_id[2]; while ( gnutls_cipher_suite_info( i, cs_id, &tmp.kx, &tmp.cipher, &tmp.mac, &tmp.version )) i++; tlsg_n_ciphers = i; /* Store a copy */ tlsg_ciphers = LDAP_MALLOC(tlsg_n_ciphers * sizeof(tls_cipher_suite)); if ( !tlsg_ciphers ) return -1; for ( i=0; ilo = lo; if ( gnutls_certificate_allocate_credentials( &ctx->cred )) { ber_memfree( ctx ); return NULL; } ctx->refcount = 1; #ifdef HAVE_CIPHERSUITES gnutls_priority_init( &ctx->prios, "NORMAL", NULL ); #endif #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_init( &ctx->ref_mutex ); #endif } return (tls_ctx *)ctx; } static void tlsg_ctx_ref( tls_ctx *ctx ) { tlsg_ctx *c = (tlsg_ctx *)ctx; #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_lock( &c->ref_mutex ); #endif c->refcount++; #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_unlock( &c->ref_mutex ); #endif } static void tlsg_ctx_free ( tls_ctx *ctx ) { tlsg_ctx *c = (tlsg_ctx *)ctx; int refcount; if ( !c ) return; #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_lock( &c->ref_mutex ); #endif refcount = --c->refcount; #ifdef LDAP_R_COMPILE ldap_pvt_thread_mutex_unlock( &c->ref_mutex ); #endif if ( refcount ) return; #ifdef HAVE_CIPHERSUITES gnutls_priority_deinit( c->prios ); #else LDAP_FREE( c->kx_list ); #endif gnutls_certificate_free_credentials( c->cred ); ber_memfree ( c ); } static int tlsg_getfile( const char *path, gnutls_datum_t *buf ) { int rc = -1, fd; struct stat st; fd = open( path, O_RDONLY ); if ( fd >= 0 && fstat( fd, &st ) == 0 ) { buf->size = st.st_size; buf->data = LDAP_MALLOC( st.st_size + 1 ); if ( buf->data ) { rc = read( fd, buf->data, st.st_size ); close( fd ); if ( rc < st.st_size ) rc = -1; else rc = 0; } } return rc; } /* This is the GnuTLS default */ #define VERIFY_DEPTH 6 /* * initialize a new TLS context */ static int tlsg_ctx_init( struct ldapoptions *lo, struct ldaptls *lt, int is_server ) { tlsg_ctx *ctx = lo->ldo_tls_ctx; int rc; if ( lo->ldo_tls_ciphersuite && tlsg_parse_ciphers( ctx, lt->lt_ciphersuite )) { Debug( LDAP_DEBUG_ANY, "TLS: could not set cipher list %s.\n", lo->ldo_tls_ciphersuite, 0, 0 ); return -1; } if (lo->ldo_tls_cacertdir != NULL) { Debug( LDAP_DEBUG_ANY, "TLS: warning: cacertdir not implemented for gnutls\n", NULL, NULL, NULL ); } if (lo->ldo_tls_cacertfile != NULL) { rc = gnutls_certificate_set_x509_trust_file( ctx->cred, lt->lt_cacertfile, GNUTLS_X509_FMT_PEM ); if ( rc < 0 ) return -1; } if ( lo->ldo_tls_certfile && lo->ldo_tls_keyfile ) { gnutls_x509_privkey_t key; gnutls_datum_t buf; gnutls_x509_crt_t certs[VERIFY_DEPTH]; unsigned int max = VERIFY_DEPTH; rc = gnutls_x509_privkey_init( &key ); if ( rc ) return -1; /* OpenSSL builds the cert chain for us, but GnuTLS * expects it to be present in the certfile. If it's * not, we have to build it ourselves. So we have to * do some special checks here... */ rc = tlsg_getfile( lt->lt_keyfile, &buf ); if ( rc ) return -1; rc = gnutls_x509_privkey_import( key, &buf, GNUTLS_X509_FMT_PEM ); LDAP_FREE( buf.data ); if ( rc < 0 ) return rc; rc = tlsg_getfile( lt->lt_certfile, &buf ); if ( rc ) return -1; rc = gnutls_x509_crt_list_import( certs, &max, &buf, GNUTLS_X509_FMT_PEM, 0 ); LDAP_FREE( buf.data ); if ( rc < 0 ) return rc; /* If there's only one cert and it's not self-signed, * then we have to build the cert chain. */ if ( max == 1 && !gnutls_x509_crt_check_issuer( certs[0], certs[0] )) { gnutls_x509_crt_t *cas; unsigned int i, j, ncas; gnutls_certificate_get_x509_cas( ctx->cred, &cas, &ncas ); for ( i = 1; icred, certs, max, key ); if ( rc ) return -1; } else if ( lo->ldo_tls_certfile || lo->ldo_tls_keyfile ) { Debug( LDAP_DEBUG_ANY, "TLS: only one of certfile and keyfile specified\n", NULL, NULL, NULL ); return -1; } if ( lo->ldo_tls_dhfile ) { Debug( LDAP_DEBUG_ANY, "TLS: warning: ignoring dhfile\n", NULL, NULL, NULL ); } if ( lo->ldo_tls_crlfile ) { rc = gnutls_certificate_set_x509_crl_file( ctx->cred, lt->lt_crlfile, GNUTLS_X509_FMT_PEM ); if ( rc < 0 ) return -1; rc = 0; } /* FIXME: ITS#5992 - this should go be configurable, * and V1 CA certs should be phased out ASAP. */ gnutls_certificate_set_verify_flags( ctx->cred, GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT ); if ( is_server ) { gnutls_dh_params_init(&ctx->dh_params); gnutls_dh_params_generate2(ctx->dh_params, DH_BITS); } return 0; } static tls_session * tlsg_session_new ( tls_ctx * ctx, int is_server ) { tlsg_ctx *c = (tlsg_ctx *)ctx; tlsg_session *session; session = ber_memcalloc ( 1, sizeof (*session) ); if ( !session ) return NULL; session->ctx = c; gnutls_init( &session->session, is_server ? GNUTLS_SERVER : GNUTLS_CLIENT ); #ifdef HAVE_CIPHERSUITES gnutls_priority_set( session->session, c->prios ); #else gnutls_set_default_priority( session->session ); if ( c->kx_list ) { gnutls_kx_set_priority( session->session, c->kx_list ); gnutls_cipher_set_priority( session->session, c->cipher_list ); gnutls_mac_set_priority( session->session, c->mac_list ); } #endif if ( c->cred ) gnutls_credentials_set( session->session, GNUTLS_CRD_CERTIFICATE, c->cred ); if ( is_server ) { int flag = 0; if ( c->lo->ldo_tls_require_cert ) { flag = GNUTLS_CERT_REQUEST; if ( c->lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_DEMAND || c->lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_HARD ) flag = GNUTLS_CERT_REQUIRE; gnutls_certificate_server_set_request( session->session, flag ); } } return (tls_session *)session; } static int tlsg_session_accept( tls_session *session ) { tlsg_session *s = (tlsg_session *)session; int rc; rc = gnutls_handshake( s->session ); if ( rc == 0 && s->ctx->lo->ldo_tls_require_cert != LDAP_OPT_X_TLS_NEVER ) { const gnutls_datum_t *peer_cert_list; unsigned int list_size; peer_cert_list = gnutls_certificate_get_peers( s->session, &list_size ); if ( !peer_cert_list && s->ctx->lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_TRY ) rc = 0; else { rc = tlsg_cert_verify( s ); if ( rc && s->ctx->lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ) rc = 0; } } return rc; } static int tlsg_session_connect( LDAP *ld, tls_session *session ) { return tlsg_session_accept( session); } static int tlsg_session_upflags( Sockbuf *sb, tls_session *session, int rc ) { tlsg_session *s = (tlsg_session *)session; if ( rc != GNUTLS_E_INTERRUPTED && rc != GNUTLS_E_AGAIN ) return 0; switch (gnutls_record_get_direction (s->session)) { case 0: sb->sb_trans_needs_read = 1; return 1; case 1: sb->sb_trans_needs_write = 1; return 1; } return 0; } static char * tlsg_session_errmsg( int rc, char *buf, size_t len ) { return (char *)gnutls_strerror( rc ); } static void tlsg_x509_cert_dn( struct berval *cert, struct berval *dn, int get_subject ) { BerElementBuffer berbuf; BerElement *ber = (BerElement *)&berbuf; ber_tag_t tag; ber_len_t len; ber_int_t i; ber_init2( ber, cert, LBER_USE_DER ); tag = ber_skip_tag( ber, &len ); /* Sequence */ tag = ber_skip_tag( ber, &len ); /* Sequence */ tag = ber_skip_tag( ber, &len ); /* Context + Constructed (version) */ if ( tag == 0xa0 ) /* Version is optional */ tag = ber_get_int( ber, &i ); /* Int: Version */ tag = ber_get_int( ber, &i ); /* Int: Serial */ tag = ber_skip_tag( ber, &len ); /* Sequence: Signature */ ber_skip_data( ber, len ); if ( !get_subject ) { tag = ber_peek_tag( ber, &len ); /* Sequence: Issuer DN */ } else { tag = ber_skip_tag( ber, &len ); ber_skip_data( ber, len ); tag = ber_skip_tag( ber, &len ); /* Sequence: Validity */ ber_skip_data( ber, len ); tag = ber_peek_tag( ber, &len ); /* Sequence: Subject DN */ } len = ber_ptrlen( ber ); dn->bv_val = cert->bv_val + len; dn->bv_len = cert->bv_len - len; } static int tlsg_session_my_dn( tls_session *session, struct berval *der_dn ) { tlsg_session *s = (tlsg_session *)session; const gnutls_datum_t *x; struct berval bv; x = gnutls_certificate_get_ours( s->session ); if (!x) return LDAP_INVALID_CREDENTIALS; bv.bv_val = (char *) x->data; bv.bv_len = x->size; tlsg_x509_cert_dn( &bv, der_dn, 1 ); return 0; } static int tlsg_session_peer_dn( tls_session *session, struct berval *der_dn ) { tlsg_session *s = (tlsg_session *)session; if ( !s->peer_der_dn.bv_val ) { const gnutls_datum_t *peer_cert_list; unsigned int list_size; struct berval bv; peer_cert_list = gnutls_certificate_get_peers( s->session, &list_size ); if ( !peer_cert_list ) return LDAP_INVALID_CREDENTIALS; bv.bv_len = peer_cert_list->size; bv.bv_val = (char *) peer_cert_list->data; tlsg_x509_cert_dn( &bv, &s->peer_der_dn, 1 ); } *der_dn = s->peer_der_dn; return 0; } /* what kind of hostname were we given? */ #define IS_DNS 0 #define IS_IP4 1 #define IS_IP6 2 #define CN_OID "2.5.4.3" static int tlsg_session_chkhost( LDAP *ld, tls_session *session, const char *name_in ) { tlsg_session *s = (tlsg_session *)session; int i, ret; const gnutls_datum_t *peer_cert_list; unsigned int list_size; char altname[NI_MAXHOST]; size_t altnamesize; gnutls_x509_crt_t cert; const char *name; char *ptr; char *domain = NULL; #ifdef LDAP_PF_INET6 struct in6_addr addr; #else struct in_addr addr; #endif int len1 = 0, len2 = 0; int ntype = IS_DNS; if( ldap_int_hostname && ( !name_in || !strcasecmp( name_in, "localhost" ) ) ) { name = ldap_int_hostname; } else { name = name_in; } peer_cert_list = gnutls_certificate_get_peers( s->session, &list_size ); if ( !peer_cert_list ) { 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; } ret = gnutls_x509_crt_init( &cert ); if ( ret < 0 ) return LDAP_LOCAL_ERROR; ret = gnutls_x509_crt_import( cert, peer_cert_list, GNUTLS_X509_FMT_DER ); if ( ret ) { gnutls_x509_crt_deinit( cert ); return LDAP_LOCAL_ERROR; } #ifdef LDAP_PF_INET6 if (name[0] == '[' && strchr(name, ']')) { char *n2 = ldap_strdup(name+1); *strchr(n2, ']') = 0; 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; } if (ntype == IS_DNS) { len1 = strlen(name); domain = strchr(name, '.'); if (domain) { len2 = len1 - (domain-name); } } for ( i=0, ret=0; ret >= 0; i++ ) { altnamesize = sizeof(altname); ret = gnutls_x509_crt_get_subject_alt_name( cert, i, altname, &altnamesize, NULL ); if ( ret < 0 ) break; /* ignore empty */ if ( altnamesize == 0 ) continue; if ( ret == GNUTLS_SAN_DNSNAME ) { if (ntype != IS_DNS) continue; /* Is this an exact match? */ if ((len1 == altnamesize) && !strncasecmp(name, altname, len1)) { break; } /* Is this a wildcard match? */ if (domain && (altname[0] == '*') && (altname[1] == '.') && (len2 == altnamesize-1) && !strncasecmp(domain, &altname[1], len2)) { break; } } else if ( ret == GNUTLS_SAN_IPADDRESS ) { if (ntype == IS_DNS) continue; #ifdef LDAP_PF_INET6 if (ntype == IS_IP6 && altnamesize != sizeof(struct in6_addr)) { continue; } else #endif if (ntype == IS_IP4 && altnamesize != sizeof(struct in_addr)) { continue; } if (!memcmp(altname, &addr, altnamesize)) { break; } } } if ( ret >= 0 ) { ret = LDAP_SUCCESS; } else { altnamesize = sizeof(altname); ret = gnutls_x509_crt_get_dn_by_oid( cert, CN_OID, 0, 0, altname, &altnamesize ); if ( ret < 0 ) { 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 { ret = LDAP_LOCAL_ERROR; if ( !len1 ) len1 = strlen( name ); if ( len1 == altnamesize && strncasecmp(name, altname, altnamesize) == 0 ) { ret = LDAP_SUCCESS; } else if (( altname[0] == '*' ) && ( altname[1] == '.' )) { /* Is this a wildcard match? */ if( domain && (len2 == altnamesize-1) && !strncasecmp(domain, &altname[1], len2)) { ret = LDAP_SUCCESS; } } } if( ret == LDAP_LOCAL_ERROR ) { altname[altnamesize] = '\0'; Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match " "common name in certificate (%s).\n", name, altname, 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")); } } gnutls_x509_crt_deinit( cert ); return ret; } static int tlsg_session_strength( tls_session *session ) { tlsg_session *s = (tlsg_session *)session; gnutls_cipher_algorithm_t c; c = gnutls_cipher_get( s->session ); return gnutls_cipher_get_key_size( c ) * 8; } /* suites is a string of colon-separated cipher suite names. */ static int tlsg_parse_ciphers( tlsg_ctx *ctx, char *suites ) { #ifdef HAVE_CIPHERSUITES const char *err; return gnutls_priority_init( &ctx->prios, suites, &err ); #else char *ptr, *end; int i, j, len, num; int *list, nkx = 0, ncipher = 0, nmac = 0; int *kx, *cipher, *mac; num = 0; ptr = suites; do { end = strchr(ptr, ':'); if ( end ) len = end - ptr; else len = strlen(ptr); for (i=0; ikx_list = kx; ctx->cipher_list = cipher; ctx->mac_list = mac; return 0; #endif } /* * TLS support for LBER Sockbufs */ struct tls_data { tlsg_session *session; Sockbuf_IO_Desc *sbiod; }; static ssize_t tlsg_recv( gnutls_transport_ptr_t ptr, void *buf, size_t len ) { struct tls_data *p; if ( buf == NULL || len <= 0 ) return 0; p = (struct tls_data *)ptr; if ( p == NULL || p->sbiod == NULL ) { return 0; } return LBER_SBIOD_READ_NEXT( p->sbiod, buf, len ); } static ssize_t tlsg_send( gnutls_transport_ptr_t ptr, const void *buf, size_t len ) { struct tls_data *p; if ( buf == NULL || len <= 0 ) return 0; p = (struct tls_data *)ptr; if ( p == NULL || p->sbiod == NULL ) { return 0; } return LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len ); } static int tlsg_sb_setup( Sockbuf_IO_Desc *sbiod, void *arg ) { struct tls_data *p; tlsg_session *session = arg; assert( sbiod != NULL ); p = LBER_MALLOC( sizeof( *p ) ); if ( p == NULL ) { return -1; } gnutls_transport_set_ptr( session->session, (gnutls_transport_ptr)p ); gnutls_transport_set_pull_function( session->session, tlsg_recv ); gnutls_transport_set_push_function( session->session, tlsg_send ); p->session = session; p->sbiod = sbiod; sbiod->sbiod_pvt = p; return 0; } static int tlsg_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; gnutls_deinit ( p->session->session ); LBER_FREE( p->session ); LBER_FREE( sbiod->sbiod_pvt ); sbiod->sbiod_pvt = NULL; return 0; } static int tlsg_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; gnutls_bye ( p->session->session, GNUTLS_SHUT_RDWR ); return 0; } static int tlsg_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 ) { *((tlsg_session **)arg) = p->session; return 1; } else if ( opt == LBER_SB_OPT_DATA_READY ) { if( gnutls_record_check_pending( p->session->session ) > 0 ) { return 1; } } return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg ); } static ber_slen_t tlsg_sb_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len) { struct tls_data *p; ber_slen_t ret; assert( sbiod != NULL ); assert( SOCKBUF_VALID( sbiod->sbiod_sb ) ); p = (struct tls_data *)sbiod->sbiod_pvt; ret = gnutls_record_recv ( p->session->session, buf, len ); switch (ret) { case GNUTLS_E_INTERRUPTED: case GNUTLS_E_AGAIN: sbiod->sbiod_sb->sb_trans_needs_read = 1; sock_errset(EWOULDBLOCK); ret = 0; break; case GNUTLS_E_REHANDSHAKE: for ( ret = gnutls_handshake ( p->session->session ); ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN; ret = gnutls_handshake ( p->session->session ) ); sbiod->sbiod_sb->sb_trans_needs_read = 1; ret = 0; break; default: sbiod->sbiod_sb->sb_trans_needs_read = 0; } return ret; } static ber_slen_t tlsg_sb_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len) { struct tls_data *p; ber_slen_t ret; assert( sbiod != NULL ); assert( SOCKBUF_VALID( sbiod->sbiod_sb ) ); p = (struct tls_data *)sbiod->sbiod_pvt; ret = gnutls_record_send ( p->session->session, (char *)buf, len ); if ( ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN ) { sbiod->sbiod_sb->sb_trans_needs_write = 1; sock_errset(EWOULDBLOCK); ret = 0; } else { sbiod->sbiod_sb->sb_trans_needs_write = 0; } return ret; } static Sockbuf_IO tlsg_sbio = { tlsg_sb_setup, /* sbi_setup */ tlsg_sb_remove, /* sbi_remove */ tlsg_sb_ctrl, /* sbi_ctrl */ tlsg_sb_read, /* sbi_read */ tlsg_sb_write, /* sbi_write */ tlsg_sb_close /* sbi_close */ }; /* Certs are not automatically varified during the handshake */ static int tlsg_cert_verify( tlsg_session *ssl ) { unsigned int status = 0; int err; time_t now = time(0); time_t peertime; err = gnutls_certificate_verify_peers2( ssl->session, &status ); if ( err < 0 ) { Debug( LDAP_DEBUG_ANY,"TLS: gnutls_certificate_verify_peers2 failed %d\n", err,0,0 ); return -1; } if ( status ) { Debug( LDAP_DEBUG_TRACE,"TLS: peer cert untrusted or revoked (0x%x)\n", status, 0,0 ); return -1; } peertime = gnutls_certificate_expiration_time_peers( ssl->session ); if ( peertime == (time_t) -1 ) { Debug( LDAP_DEBUG_ANY, "TLS: gnutls_certificate_expiration_time_peers failed\n", 0, 0, 0 ); return -1; } if ( peertime < now ) { Debug( LDAP_DEBUG_ANY, "TLS: peer certificate is expired\n", 0, 0, 0 ); return -1; } peertime = gnutls_certificate_activation_time_peers( ssl->session ); if ( peertime == (time_t) -1 ) { Debug( LDAP_DEBUG_ANY, "TLS: gnutls_certificate_activation_time_peers failed\n", 0, 0, 0 ); return -1; } if ( peertime > now ) { Debug( LDAP_DEBUG_ANY, "TLS: peer certificate not yet active\n", 0, 0, 0 ); return -1; } return 0; } tls_impl ldap_int_tls_impl = { "GnuTLS", tlsg_init, tlsg_destroy, tlsg_ctx_new, tlsg_ctx_ref, tlsg_ctx_free, tlsg_ctx_init, tlsg_session_new, tlsg_session_connect, tlsg_session_accept, tlsg_session_upflags, tlsg_session_errmsg, tlsg_session_my_dn, tlsg_session_peer_dn, tlsg_session_chkhost, tlsg_session_strength, &tlsg_sbio, #ifdef LDAP_R_COMPILE tlsg_thr_init, #else NULL, #endif 0 }; #endif /* HAVE_GNUTLS */