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-rw-r--r--libraries/libldap/tls_g.c1278
1 files changed, 1278 insertions, 0 deletions
diff --git a/libraries/libldap/tls_g.c b/libraries/libldap/tls_g.c
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--- /dev/null
+++ b/libraries/libldap/tls_g.c
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+/* tls_g.c - Handle tls/ssl using GNUTLS. */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2008-2022 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: GNUTLS support written by Howard Chu and
+ * Emily Backes; sponsored by The Written Word (thewrittenword.com)
+ * and Stanford University (stanford.edu).
+ */
+
+#include "portable.h"
+
+#ifdef HAVE_GNUTLS
+
+#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 <sys/stat.h>
+#include <fcntl.h>
+
+#include "ldap-int.h"
+#include "ldap-tls.h"
+
+#include <gnutls/gnutls.h>
+#include <gnutls/x509.h>
+#include <gnutls/abstract.h>
+#include <gnutls/crypto.h>
+
+typedef struct tlsg_ctx {
+ gnutls_certificate_credentials_t cred;
+ gnutls_dh_params_t dh_params;
+ unsigned long verify_depth;
+ int refcount;
+ int reqcert;
+ gnutls_priority_t prios;
+#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;
+
+static int tlsg_parse_ciphers( tlsg_ctx *ctx, char *suites );
+static int tlsg_cert_verify( tlsg_session *s );
+
+#ifdef LDAP_R_COMPILE
+
+static void
+tlsg_thr_init( void )
+{
+ /* do nothing */
+}
+#endif /* LDAP_R_COMPILE */
+
+/*
+ * Initialize TLS subsystem. Should be called only once.
+ */
+static int
+tlsg_init( void )
+{
+ gnutls_global_init();
+ return 0;
+}
+
+/*
+ * Tear down the TLS subsystem. Should only be called once.
+ */
+static void
+tlsg_destroy( void )
+{
+ gnutls_global_deinit();
+}
+
+static tls_ctx *
+tlsg_ctx_new ( struct ldapoptions *lo )
+{
+ tlsg_ctx *ctx;
+
+ ctx = ber_memcalloc ( 1, sizeof (*ctx) );
+ if ( ctx ) {
+ if ( gnutls_certificate_allocate_credentials( &ctx->cred )) {
+ ber_memfree( ctx );
+ return NULL;
+ }
+ ctx->refcount = 1;
+ gnutls_priority_init( &ctx->prios, "NORMAL", NULL );
+#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;
+ LDAP_MUTEX_LOCK( &c->ref_mutex );
+ c->refcount++;
+ LDAP_MUTEX_UNLOCK( &c->ref_mutex );
+}
+
+static void
+tlsg_ctx_free ( tls_ctx *ctx )
+{
+ tlsg_ctx *c = (tlsg_ctx *)ctx;
+ int refcount;
+
+ if ( !c ) return;
+
+ LDAP_MUTEX_LOCK( &c->ref_mutex );
+ refcount = --c->refcount;
+ LDAP_MUTEX_UNLOCK( &c->ref_mutex );
+ if ( refcount )
+ return;
+ gnutls_priority_deinit( c->prios );
+ gnutls_certificate_free_credentials( c->cred );
+ if ( c->dh_params )
+ gnutls_dh_params_deinit( c->dh_params );
+ ber_memfree ( c );
+}
+
+static int
+tlsg_getfile( const char *path, gnutls_datum_t *buf )
+{
+ int rc = -1, fd;
+ struct stat st;
+ char ebuf[128];
+
+ fd = open( path, O_RDONLY );
+ if ( fd < 0 ) {
+ Debug2( LDAP_DEBUG_ANY,
+ "TLS: opening `%s' failed: %s\n",
+ path,
+ AC_STRERROR_R( errno, ebuf, sizeof ebuf ));
+ return -1;
+ }
+ if ( 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, char *errmsg )
+{
+ tlsg_ctx *ctx = lo->ldo_tls_ctx;
+ int rc;
+
+ if ( lo->ldo_tls_ciphersuite &&
+ tlsg_parse_ciphers( ctx, lt->lt_ciphersuite )) {
+ Debug1( LDAP_DEBUG_ANY,
+ "TLS: could not set cipher list %s.\n",
+ lo->ldo_tls_ciphersuite );
+ return -1;
+ }
+
+ if (lo->ldo_tls_cacertdir != NULL) {
+ char **dirs = ldap_str2charray( lt->lt_cacertdir, CERTPATHSEP );
+ int i;
+ for ( i=0; dirs[i]; i++ ) {
+ rc = gnutls_certificate_set_x509_trust_dir(
+ ctx->cred,
+ dirs[i],
+ GNUTLS_X509_FMT_PEM );
+ if ( rc > 0 ) {
+ Debug2( LDAP_DEBUG_TRACE,
+ "TLS: loaded %d CA certificates from directory `%s'.\n",
+ rc, dirs[i] );
+ } else {
+ Debug1( LDAP_DEBUG_ANY,
+ "TLS: warning: no certificate found in CA certificate directory `%s'.\n",
+ dirs[i] );
+ /* only warn, no return */
+ strncpy( errmsg, gnutls_strerror( rc ), ERRBUFSIZE );
+ }
+ }
+ ldap_charray_free( dirs );
+ }
+
+ 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 ) {
+ Debug3( LDAP_DEBUG_ANY,
+ "TLS: could not use CA certificate file `%s': %s (%d)\n",
+ lo->ldo_tls_cacertfile,
+ gnutls_strerror( rc ),
+ rc );
+ return -1;
+ } else if ( rc == 0 ) {
+ Debug1( LDAP_DEBUG_ANY,
+ "TLS: warning: no certificate loaded from CA certificate file `%s'.\n",
+ lo->ldo_tls_cacertfile );
+ /* only warn, no return */
+ strncpy( errmsg, gnutls_strerror( rc ), ERRBUFSIZE );
+ }
+ }
+
+ if (lo->ldo_tls_cacert.bv_val != NULL ) {
+ gnutls_datum_t buf;
+ buf.data = (unsigned char *)lo->ldo_tls_cacert.bv_val;
+ buf.size = lo->ldo_tls_cacert.bv_len;
+ rc = gnutls_certificate_set_x509_trust_mem(
+ ctx->cred,
+ &buf,
+ GNUTLS_X509_FMT_DER );
+ if ( rc < 0 ) {
+ Debug2( LDAP_DEBUG_ANY,
+ "TLS: could not use CA certificate: %s (%d)\n",
+ gnutls_strerror( rc ),
+ rc );
+ strncpy( errmsg, gnutls_strerror( rc ), ERRBUFSIZE );
+ return -1;
+ }
+ }
+
+ if (( lo->ldo_tls_certfile && lo->ldo_tls_keyfile ) ||
+ ( lo->ldo_tls_cert.bv_val && lo->ldo_tls_key.bv_val )) {
+ 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 ) {
+ strncpy( errmsg, gnutls_strerror( rc ), ERRBUFSIZE );
+ 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...
+ */
+ if ( lo->ldo_tls_key.bv_val ) {
+ buf.data = (unsigned char *)lo->ldo_tls_key.bv_val;
+ buf.size = lo->ldo_tls_key.bv_len;
+ rc = gnutls_x509_privkey_import( key, &buf,
+ GNUTLS_X509_FMT_DER );
+ } else {
+ rc = tlsg_getfile( lt->lt_keyfile, &buf );
+ if ( rc ) {
+ Debug1( LDAP_DEBUG_ANY,
+ "TLS: could not use private key file `%s`.\n",
+ lt->lt_keyfile);
+ return -1;
+ }
+ rc = gnutls_x509_privkey_import( key, &buf,
+ GNUTLS_X509_FMT_PEM );
+ LDAP_FREE( buf.data );
+ }
+ if ( rc < 0 ) {
+ Debug2( LDAP_DEBUG_ANY,
+ "TLS: could not use private key: %s (%d)\n",
+ gnutls_strerror( rc ),
+ rc );
+ strncpy( errmsg, gnutls_strerror( rc ), ERRBUFSIZE );
+ return rc;
+ }
+
+ if ( lo->ldo_tls_cert.bv_val ) {
+ buf.data = (unsigned char *)lo->ldo_tls_cert.bv_val;
+ buf.size = lo->ldo_tls_cert.bv_len;
+ rc = gnutls_x509_crt_list_import( certs, &max, &buf,
+ GNUTLS_X509_FMT_DER, 0 );
+ } else {
+ rc = tlsg_getfile( lt->lt_certfile, &buf );
+ if ( rc ) {
+ Debug1( LDAP_DEBUG_ANY,
+ "TLS: could not use certificate file `%s`.\n",
+ lt->lt_certfile);
+ return -1;
+ }
+ rc = gnutls_x509_crt_list_import( certs, &max, &buf,
+ GNUTLS_X509_FMT_PEM, 0 );
+ LDAP_FREE( buf.data );
+ }
+ if ( rc < 0 ) {
+ Debug2( LDAP_DEBUG_ANY,
+ "TLS: could not use certificate: %s (%d)\n",
+ gnutls_strerror( rc ),
+ rc );
+ strncpy( errmsg, gnutls_strerror( rc ), ERRBUFSIZE );
+ 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] )) {
+ unsigned int i;
+ for ( i = 1; i<VERIFY_DEPTH; i++ ) {
+ if ( gnutls_certificate_get_issuer( ctx->cred, certs[i-1], &certs[i], 0 ))
+ break;
+ max++;
+ /* If this CA is self-signed, we're done */
+ if ( gnutls_x509_crt_check_issuer( certs[i], certs[i] ))
+ break;
+ }
+ }
+ rc = gnutls_certificate_set_x509_key( ctx->cred, certs, max, key );
+ if ( rc ) {
+ Debug2( LDAP_DEBUG_ANY,
+ "TLS: could not use certificate with key: %s (%d)\n",
+ gnutls_strerror( rc ),
+ rc );
+ strncpy( errmsg, gnutls_strerror( rc ), ERRBUFSIZE );
+ return -1;
+ }
+ } else if (( lo->ldo_tls_certfile || lo->ldo_tls_keyfile )) {
+ Debug0( LDAP_DEBUG_ANY,
+ "TLS: only one of certfile and keyfile specified\n" );
+ return -1;
+ } else if (( lo->ldo_tls_cert.bv_val || lo->ldo_tls_key.bv_val )) {
+ Debug0( LDAP_DEBUG_ANY,
+ "TLS: only one of cert and key specified\n" );
+ return -1;
+ }
+
+ if ( lo->ldo_tls_crlfile ) {
+ rc = gnutls_certificate_set_x509_crl_file(
+ ctx->cred,
+ lt->lt_crlfile,
+ GNUTLS_X509_FMT_PEM );
+ if ( rc < 0 ) {
+ strncpy( errmsg, gnutls_strerror( rc ), ERRBUFSIZE );
+ return -1;
+ }
+ rc = 0;
+ }
+
+ /* FIXME: ITS#5992 - this should 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 && lo->ldo_tls_dhfile ) {
+ gnutls_datum_t buf;
+ rc = tlsg_getfile( lo->ldo_tls_dhfile, &buf );
+ if ( rc ) return -1;
+ rc = gnutls_dh_params_init( &ctx->dh_params );
+ if ( rc == 0 )
+ rc = gnutls_dh_params_import_pkcs3( ctx->dh_params, &buf,
+ GNUTLS_X509_FMT_PEM );
+ LDAP_FREE( buf.data );
+ if ( rc ) {
+ strncpy( errmsg, gnutls_strerror( rc ), ERRBUFSIZE );
+ return -1;
+ }
+ gnutls_certificate_set_dh_params( ctx->cred, ctx->dh_params );
+ }
+
+ ctx->reqcert = lo->ldo_tls_require_cert;
+
+ 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 );
+ gnutls_priority_set( session->session, c->prios );
+ if ( c->cred )
+ gnutls_credentials_set( session->session, GNUTLS_CRD_CERTIFICATE, c->cred );
+
+ if ( is_server ) {
+ int flag = 0;
+ if ( c->reqcert ) {
+ flag = GNUTLS_CERT_REQUEST;
+ if ( c->reqcert == LDAP_OPT_X_TLS_DEMAND ||
+ c->reqcert == 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->reqcert != 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->reqcert == LDAP_OPT_X_TLS_TRY )
+ rc = 0;
+ else {
+ rc = tlsg_cert_verify( s );
+ if ( rc && s->ctx->reqcert == LDAP_OPT_X_TLS_ALLOW )
+ rc = 0;
+ }
+ }
+ return rc;
+}
+
+static int
+tlsg_session_connect( LDAP *ld, tls_session *session, const char *name_in )
+{
+ tlsg_session *s = (tlsg_session *)session;
+ int rc;
+
+ if ( name_in ) {
+ rc = gnutls_server_name_set( s->session, GNUTLS_NAME_DNS, name_in, strlen(name_in) );
+ if ( rc != GNUTLS_E_SUCCESS ) {
+ return rc;
+ }
+ }
+
+ 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( tls_session *sess, 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_peek_tag( ber, &len ); /* Context + Constructed (version) */
+ if ( tag == 0xa0 ) { /* Version is optional */
+ tag = ber_skip_tag( ber, &len );
+ tag = ber_get_int( ber, &i ); /* Int: Version */
+ }
+ tag = ber_skip_tag( ber, &len ); /* Int: Serial (can be longer than ber_int_t) */
+ ber_skip_data( ber, len );
+ 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;
+ int chkSAN = ld->ld_options.ldo_tls_require_san, gotSAN = 0;
+ 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 ) {
+ Debug0( LDAP_DEBUG_ANY,
+ "TLS: unable to get peer certificate.\n" );
+ /* 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 (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;
+ }
+
+ if (ntype == IS_DNS) {
+ len1 = strlen(name);
+ domain = strchr(name, '.');
+ if (domain) {
+ len2 = len1 - (domain-name);
+ }
+ }
+
+ if (chkSAN) {
+ 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;
+
+ gotSAN = 1;
+ /* 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;
+ }
+ }
+ if (ret != LDAP_SUCCESS && chkSAN) {
+ switch(chkSAN) {
+ case LDAP_OPT_X_TLS_DEMAND:
+ case LDAP_OPT_X_TLS_HARD:
+ if (!gotSAN) {
+ Debug0( LDAP_DEBUG_ANY,
+ "TLS: unable to get subjectAltName from peer certificate.\n" );
+ ret = LDAP_CONNECT_ERROR;
+ if ( ld->ld_error ) {
+ LDAP_FREE( ld->ld_error );
+ }
+ ld->ld_error = LDAP_STRDUP(
+ _("TLS: unable to get subjectAltName from peer certificate"));
+ goto done;
+ }
+ /* FALLTHRU */
+ case LDAP_OPT_X_TLS_TRY:
+ if (gotSAN) {
+ Debug1( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
+ "subjectAltName in certificate.\n",
+ name );
+ ret = LDAP_CONNECT_ERROR;
+ if ( ld->ld_error ) {
+ LDAP_FREE( ld->ld_error );
+ }
+ ld->ld_error = LDAP_STRDUP(
+ _("TLS: hostname does not match subjectAltName in peer certificate"));
+ goto done;
+ }
+ break;
+ case LDAP_OPT_X_TLS_ALLOW:
+ break;
+ }
+ }
+
+ if ( ret != LDAP_SUCCESS ){
+ /* find the last CN */
+ i=0;
+ do {
+ altnamesize = 0;
+ ret = gnutls_x509_crt_get_dn_by_oid( cert, CN_OID,
+ i, 1, altname, &altnamesize );
+ if ( ret == GNUTLS_E_SHORT_MEMORY_BUFFER )
+ i++;
+ else
+ break;
+ } while ( 1 );
+
+ if ( i ) {
+ altnamesize = sizeof(altname);
+ ret = gnutls_x509_crt_get_dn_by_oid( cert, CN_OID,
+ i-1, 0, altname, &altnamesize );
+ }
+
+ if ( ret < 0 ) {
+ Debug0( LDAP_DEBUG_ANY,
+ "TLS: unable to get common name from peer certificate.\n" );
+ 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';
+ Debug2( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
+ "common name in certificate (%s).\n",
+ name, altname );
+ ret = LDAP_CONNECT_ERROR;
+ if ( ld->ld_error ) {
+ LDAP_FREE( ld->ld_error );
+ }
+ ld->ld_error = LDAP_STRDUP(
+ _("TLS: hostname does not match name in peer certificate"));
+ }
+ }
+done:
+ 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;
+}
+
+static int
+tlsg_session_unique( tls_session *sess, struct berval *buf, int is_server)
+{
+ tlsg_session *s = (tlsg_session *)sess;
+ gnutls_datum_t cb;
+ int rc;
+
+ rc = gnutls_session_channel_binding( s->session, GNUTLS_CB_TLS_UNIQUE, &cb );
+ if ( rc == 0 ) {
+ int len = cb.size;
+ if ( len > buf->bv_len )
+ len = buf->bv_len;
+ buf->bv_len = len;
+ memcpy( buf->bv_val, cb.data, len );
+ return len;
+ }
+ return 0;
+}
+
+static int
+tlsg_session_endpoint( tls_session *sess, struct berval *buf, int is_server )
+{
+ tlsg_session *s = (tlsg_session *)sess;
+ const gnutls_datum_t *cert_data;
+ gnutls_x509_crt_t server_cert;
+ gnutls_digest_algorithm_t md;
+ int sign_algo, md_len, rc;
+
+ if ( is_server )
+ cert_data = gnutls_certificate_get_ours( s->session );
+ else
+ cert_data = gnutls_certificate_get_peers( s->session, NULL );
+
+ if ( cert_data == NULL )
+ return 0;
+
+ rc = gnutls_x509_crt_init( &server_cert );
+ if ( rc != GNUTLS_E_SUCCESS )
+ return 0;
+
+ rc = gnutls_x509_crt_import( server_cert, cert_data, GNUTLS_X509_FMT_DER );
+ if ( rc != GNUTLS_E_SUCCESS ) {
+ gnutls_x509_crt_deinit( server_cert );
+ return 0;
+ }
+
+ sign_algo = gnutls_x509_crt_get_signature_algorithm( server_cert );
+ gnutls_x509_crt_deinit( server_cert );
+ if ( sign_algo <= GNUTLS_SIGN_UNKNOWN )
+ return 0;
+
+ md = gnutls_sign_get_hash_algorithm( sign_algo );
+ if ( md == GNUTLS_DIG_UNKNOWN )
+ return 0;
+
+ /* See RFC 5929 */
+ switch (md) {
+ case GNUTLS_DIG_NULL:
+ case GNUTLS_DIG_MD2:
+ case GNUTLS_DIG_MD5:
+ case GNUTLS_DIG_SHA1:
+ md = GNUTLS_DIG_SHA256;
+ }
+
+ md_len = gnutls_hash_get_len( md );
+ if ( md_len == 0 || md_len > buf->bv_len )
+ return 0;
+
+ rc = gnutls_hash_fast( md, cert_data->data, cert_data->size, buf->bv_val );
+ if ( rc != GNUTLS_E_SUCCESS )
+ return 0;
+
+ buf->bv_len = md_len;
+
+ return md_len;
+}
+
+static const char *
+tlsg_session_version( tls_session *sess )
+{
+ tlsg_session *s = (tlsg_session *)sess;
+ return gnutls_protocol_get_name(gnutls_protocol_get_version( s->session ));
+}
+
+static const char *
+tlsg_session_cipher( tls_session *sess )
+{
+ tlsg_session *s = (tlsg_session *)sess;
+ return gnutls_cipher_get_name(gnutls_cipher_get( s->session ));
+}
+
+static int
+tlsg_session_peercert( tls_session *sess, struct berval *der )
+{
+ tlsg_session *s = (tlsg_session *)sess;
+ 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)
+ return -1;
+ der->bv_len = peer_cert_list[0].size;
+ der->bv_val = LDAP_MALLOC( der->bv_len );
+ if (!der->bv_val)
+ return -1;
+ memcpy(der->bv_val, peer_cert_list[0].data, der->bv_len);
+ return 0;
+}
+
+static int
+tlsg_session_pinning( LDAP *ld, tls_session *sess, char *hashalg, struct berval *hash )
+{
+ tlsg_session *s = (tlsg_session *)sess;
+ const gnutls_datum_t *cert_list;
+ unsigned int cert_list_size = 0;
+ gnutls_x509_crt_t crt;
+ gnutls_pubkey_t pubkey;
+ gnutls_datum_t key = {};
+ gnutls_digest_algorithm_t alg;
+ struct berval keyhash;
+ size_t len;
+ int rc = -1;
+
+ if ( hashalg ) {
+ alg = gnutls_digest_get_id( hashalg );
+ if ( alg == GNUTLS_DIG_UNKNOWN ) {
+ Debug1( LDAP_DEBUG_ANY, "tlsg_session_pinning: "
+ "unknown hashing algorithm for GnuTLS: '%s'\n",
+ hashalg );
+ return rc;
+ }
+ }
+
+ cert_list = gnutls_certificate_get_peers( s->session, &cert_list_size );
+ if ( cert_list_size == 0 ) {
+ return rc;
+ }
+
+ if ( gnutls_x509_crt_init( &crt ) < 0 ) {
+ return rc;
+ }
+
+ if ( gnutls_x509_crt_import( crt, &cert_list[0], GNUTLS_X509_FMT_DER ) ) {
+ goto done;
+ }
+
+ if ( gnutls_pubkey_init( &pubkey ) ) {
+ goto done;
+ }
+
+ if ( gnutls_pubkey_import_x509( pubkey, crt, 0 ) < 0 ) {
+ goto done;
+ }
+
+ gnutls_pubkey_export( pubkey, GNUTLS_X509_FMT_DER, key.data, &len );
+ if ( len <= 0 ) {
+ goto done;
+ }
+
+ key.data = LDAP_MALLOC( len );
+ if ( !key.data ) {
+ goto done;
+ }
+
+ key.size = len;
+
+ if ( gnutls_pubkey_export( pubkey, GNUTLS_X509_FMT_DER,
+ key.data, &len ) < 0 ) {
+ goto done;
+ }
+
+ if ( hashalg ) {
+ keyhash.bv_len = gnutls_hash_get_len( alg );
+ keyhash.bv_val = LDAP_MALLOC( keyhash.bv_len );
+ if ( !keyhash.bv_val || gnutls_fingerprint( alg, &key,
+ keyhash.bv_val, &keyhash.bv_len ) < 0 ) {
+ goto done;
+ }
+ } else {
+ keyhash.bv_val = (char *)key.data;
+ keyhash.bv_len = key.size;
+ }
+
+ if ( ber_bvcmp( hash, &keyhash ) ) {
+ rc = LDAP_CONNECT_ERROR;
+ Debug0( LDAP_DEBUG_ANY, "tlsg_session_pinning: "
+ "public key hash does not match provided pin.\n" );
+ if ( ld->ld_error ) {
+ LDAP_FREE( ld->ld_error );
+ }
+ ld->ld_error = LDAP_STRDUP(
+ _("TLS: public key hash does not match provided pin"));
+ } else {
+ rc = LDAP_SUCCESS;
+ }
+
+done:
+ if ( pubkey ) {
+ gnutls_pubkey_deinit( pubkey );
+ }
+ if ( crt ) {
+ gnutls_x509_crt_deinit( crt );
+ }
+ if ( keyhash.bv_val != (char *)key.data ) {
+ LDAP_FREE( keyhash.bv_val );
+ }
+ if ( key.data ) {
+ LDAP_FREE( key.data );
+ }
+ return rc;
+}
+
+/* suites is a string of colon-separated cipher suite names. */
+static int
+tlsg_parse_ciphers( tlsg_ctx *ctx, char *suites )
+{
+ const char *err;
+ int rc = gnutls_priority_init( &ctx->prios, suites, &err );
+ if ( rc )
+ ctx->prios = NULL;
+ return rc;
+}
+
+/*
+ * 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_t)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_WR );
+ 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 verified 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 ) {
+ Debug1( LDAP_DEBUG_ANY,"TLS: gnutls_certificate_verify_peers2 failed %d\n",
+ err );
+ return -1;
+ }
+ if ( status ) {
+ Debug1( LDAP_DEBUG_TRACE,"TLS: peer cert untrusted or revoked (0x%x)\n",
+ status );
+ return -1;
+ }
+ peertime = gnutls_certificate_expiration_time_peers( ssl->session );
+ if ( peertime == (time_t) -1 ) {
+ Debug0( LDAP_DEBUG_ANY, "TLS: gnutls_certificate_expiration_time_peers failed\n" );
+ return -1;
+ }
+ if ( peertime < now ) {
+ Debug0( LDAP_DEBUG_ANY, "TLS: peer certificate is expired\n" );
+ return -1;
+ }
+ peertime = gnutls_certificate_activation_time_peers( ssl->session );
+ if ( peertime == (time_t) -1 ) {
+ Debug0( LDAP_DEBUG_ANY, "TLS: gnutls_certificate_activation_time_peers failed\n" );
+ return -1;
+ }
+ if ( peertime > now ) {
+ Debug0( LDAP_DEBUG_ANY, "TLS: peer certificate not yet active\n" );
+ 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_session_unique,
+ tlsg_session_endpoint,
+ tlsg_session_version,
+ tlsg_session_cipher,
+ tlsg_session_peercert,
+ tlsg_session_pinning,
+
+ &tlsg_sbio,
+
+#ifdef LDAP_R_COMPILE
+ tlsg_thr_init,
+#else
+ NULL,
+#endif
+
+ 0
+};
+
+#endif /* HAVE_GNUTLS */