X-Git-Url: https://vcs.fsf.org/?p=exim.git;a=blobdiff_plain;f=src%2Fsrc%2Ftls-gnu.c;h=383a00f4ededfc6b0aee181d9815f15f76259099;hp=4943f48b7d2e3318bb46c683d32c44e65b629185;hb=60d10ce7e68a5f2cf771a5c079521c8e4f18d157;hpb=cb1d783072c488a4a558607b2ee122efba95aa4b

diff --git a/src/src/tls-gnu.c b/src/src/tls-gnu.c
index 4943f48b7..383a00f4e 100644
--- a/src/src/tls-gnu.c
+++ b/src/src/tls-gnu.c
@@ -2,7 +2,7 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2014 */
+/* Copyright (c) University of Cambridge 1995 - 2015 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* Copyright (c) Phil Pennock 2012 */
@@ -42,21 +42,22 @@ require current GnuTLS, then we'll drop support for the ancient libraries).
 /* needed to disable PKCS11 autoload unless requested */
 #if GNUTLS_VERSION_NUMBER >= 0x020c00
 # include <gnutls/pkcs11.h>
+# define SUPPORT_PARAM_TO_PK_BITS
 #endif
 #if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
 # warning "GnuTLS library version too old; define DISABLE_OCSP in Makefile"
 # define DISABLE_OCSP
 #endif
-#if GNUTLS_VERSION_NUMBER < 0x020a00 && defined(EXPERIMENTAL_EVENT)
+#if GNUTLS_VERSION_NUMBER < 0x020a00 && !defined(DISABLE_EVENT)
 # warning "GnuTLS library version too old; tls:cert event unsupported"
-# undef EXPERIMENTAL_EVENT
+# define DISABLE_EVENT
 #endif
 #if GNUTLS_VERSION_NUMBER >= 0x030306
 # define SUPPORT_CA_DIR
 #else
 # undef  SUPPORT_CA_DIR
 #endif
-#if GNUTLS_VERSION_NUMBER >= 0x030314
+#if GNUTLS_VERSION_NUMBER >= 0x030014
 # define SUPPORT_SYSDEFAULT_CABUNDLE
 #endif
 
@@ -120,8 +121,8 @@ typedef struct exim_gnutls_state {
   uschar *exp_tls_crl;
   uschar *exp_tls_require_ciphers;
   uschar *exp_tls_ocsp_file;
-  uschar *exp_tls_verify_cert_hostnames;
-#ifdef EXPERIMENTAL_EVENT
+  const uschar *exp_tls_verify_cert_hostnames;
+#ifndef DISABLE_EVENT
   uschar *event_action;
 #endif
 
@@ -140,7 +141,7 @@ static const exim_gnutls_state_st exim_gnutls_state_init = {
   NULL, NULL, NULL, NULL, NULL, NULL,
   NULL, NULL, NULL, NULL, NULL, NULL, NULL,
   NULL,
-#ifdef EXPERIMENTAL_EVENT
+#ifndef DISABLE_EVENT
                                             NULL,
 #endif
   NULL,
@@ -176,6 +177,10 @@ static const char * const exim_default_gnutls_priority = "NORMAL";
 
 static BOOL exim_gnutls_base_init_done = FALSE;
 
+#ifndef DISABLE_OCSP
+static BOOL gnutls_buggy_ocsp = FALSE;
+#endif
+
 
 /* ------------------------------------------------------------------------ */
 /* macros */
@@ -335,7 +340,7 @@ tls_error(when, msg, state->host);
     } while (0)
 
 static int
-import_cert(const gnutls_datum * cert, gnutls_x509_crt_t * crtp)
+import_cert(const gnutls_datum_t * cert, gnutls_x509_crt_t * crtp)
 {
 int rc;
 
@@ -409,7 +414,7 @@ if (rc) {
 } else {
   old_pool = store_pool;
   store_pool = POOL_PERM;
-  tls_channelbinding_b64 = auth_b64encode(channel.data, (int)channel.size);
+  tls_channelbinding_b64 = b64encode(channel.data, (int)channel.size);
   store_pool = old_pool;
   DEBUG(D_tls) debug_printf("Have channel bindings cached for possible auth usage.\n");
 }
@@ -421,7 +426,7 @@ tlsp->sni =    state->received_sni;
 
 /* record our certificate */
   {
-  const gnutls_datum * cert = gnutls_certificate_get_ours(state->session);
+  const gnutls_datum_t * cert = gnutls_certificate_get_ours(state->session);
   gnutls_x509_crt_t crt;
 
   tlsp->ourcert = cert && import_cert(cert, &crt)==0 ? crt : NULL;
@@ -453,7 +458,7 @@ init_server_dh(void)
 {
 int fd, rc;
 unsigned int dh_bits;
-gnutls_datum m;
+gnutls_datum_t m;
 uschar filename_buf[PATH_MAX];
 uschar *filename = NULL;
 size_t sz;
@@ -561,8 +566,7 @@ if (fd >= 0)
     (void)close(fd);
     return tls_error(US"TLS cache not a file", NULL, NULL);
     }
-  fp = fdopen(fd, "rb");
-  if (!fp)
+  if (!(fp = fdopen(fd, "rb")))
     {
     saved_errno = errno;
     (void)close(fd);
@@ -571,14 +575,12 @@ if (fd >= 0)
     }
 
   m.size = statbuf.st_size;
-  m.data = malloc(m.size);
-  if (m.data == NULL)
+  if (!(m.data = malloc(m.size)))
     {
     fclose(fp);
     return tls_error(US"malloc failed", strerror(errno), NULL);
     }
-  sz = fread(m.data, m.size, 1, fp);
-  if (!sz)
+  if (!(sz = fread(m.data, m.size, 1, fp)))
     {
     saved_errno = errno;
     fclose(fp);
@@ -660,9 +662,9 @@ if (rc < 0)
   if (rc != GNUTLS_E_SHORT_MEMORY_BUFFER)
     exim_gnutls_err_check(US"gnutls_dh_params_export_pkcs3(NULL) sizing");
   m.size = sz;
-  m.data = malloc(m.size);
-  if (m.data == NULL)
+  if (!(m.data = malloc(m.size)))
     return tls_error(US"memory allocation failed", strerror(errno), NULL);
+
   /* this will return a size 1 less than the allocation size above */
   rc = gnutls_dh_params_export_pkcs3(dh_server_params, GNUTLS_X509_FMT_PEM,
       m.data, &sz);
@@ -705,6 +707,74 @@ return OK;
 
 
 
+/* Create and install a selfsigned certificate, for use in server mode */
+
+static int
+tls_install_selfsign(exim_gnutls_state_st * state)
+{
+gnutls_x509_crt_t cert = NULL;
+time_t now;
+gnutls_x509_privkey_t pkey = NULL;
+const uschar * where;
+int rc;
+
+where = US"initialising pkey";
+if ((rc = gnutls_x509_privkey_init(&pkey))) goto err;
+
+where = US"initialising cert";
+if ((rc = gnutls_x509_crt_init(&cert))) goto err;
+
+where = US"generating pkey";
+if ((rc = gnutls_x509_privkey_generate(pkey, GNUTLS_PK_RSA,
+#ifdef SUPPORT_PARAM_TO_PK_BITS
+	    gnutls_sec_param_to_pk_bits(GNUTLS_PK_RSA, GNUTLS_SEC_PARAM_LOW),
+#else
+	    1024,
+#endif
+	    0)))
+  goto err;
+
+where = US"configuring cert";
+now = 0;
+if (  (rc = gnutls_x509_crt_set_version(cert, 3))
+   || (rc = gnutls_x509_crt_set_serial(cert, &now, sizeof(now)))
+   || (rc = gnutls_x509_crt_set_activation_time(cert, now = time(NULL)))
+   || (rc = gnutls_x509_crt_set_expiration_time(cert, now + 60 * 60)) /* 1 hr */
+   || (rc = gnutls_x509_crt_set_key(cert, pkey))
+
+   || (rc = gnutls_x509_crt_set_dn_by_oid(cert,
+	      GNUTLS_OID_X520_COUNTRY_NAME, 0, "UK", 2))
+   || (rc = gnutls_x509_crt_set_dn_by_oid(cert,
+	      GNUTLS_OID_X520_ORGANIZATION_NAME, 0, "Exim Developers", 15))
+   || (rc = gnutls_x509_crt_set_dn_by_oid(cert,
+	      GNUTLS_OID_X520_COMMON_NAME, 0,
+	      smtp_active_hostname, Ustrlen(smtp_active_hostname)))
+   )
+  goto err;
+
+where = US"signing cert";
+if ((rc = gnutls_x509_crt_sign(cert, cert, pkey))) goto err;
+
+where = US"installing selfsign cert";
+					/* Since: 2.4.0 */
+if ((rc = gnutls_certificate_set_x509_key(state->x509_cred, &cert, 1, pkey)))
+  goto err;
+
+rc = OK;
+
+out:
+  if (cert) gnutls_x509_crt_deinit(cert);
+  if (pkey) gnutls_x509_privkey_deinit(pkey);
+  return rc;
+
+err:
+  rc = tls_error(where, gnutls_strerror(rc), NULL);
+  goto out;
+}
+
+
+
+
 /*************************************************
 *       Variables re-expanded post-SNI           *
 *************************************************/
@@ -737,7 +807,6 @@ int cert_count;
 
 /* We check for tls_sni *before* expansion. */
 if (!host)	/* server */
-  {
   if (!state->received_sni)
     {
     if (state->tls_certificate &&
@@ -758,7 +827,6 @@ if (!host)	/* server */
     saved_tls_verify_certificates = state->exp_tls_verify_certificates;
     saved_tls_crl = state->exp_tls_crl;
     }
-  }
 
 rc = gnutls_certificate_allocate_credentials(&state->x509_cred);
 exim_gnutls_err_check(US"gnutls_certificate_allocate_credentials");
@@ -775,14 +843,13 @@ if (!expand_check_tlsvar(tls_certificate))
 
 /* certificate is mandatory in server, optional in client */
 
-if ((state->exp_tls_certificate == NULL) ||
-    (*state->exp_tls_certificate == '\0'))
-  {
+if (  !state->exp_tls_certificate
+   || !*state->exp_tls_certificate
+   )
   if (!host)
-    return tls_error(US"no TLS server certificate is specified", NULL, NULL);
+    return tls_install_selfsign(state);
   else
     DEBUG(D_tls) debug_printf("TLS: no client certificate specified; okay\n");
-  }
 
 if (state->tls_privatekey && !expand_check_tlsvar(tls_privatekey))
   return DEFER;
@@ -802,9 +869,9 @@ if (state->exp_tls_certificate && *state->exp_tls_certificate)
       state->exp_tls_certificate, state->exp_tls_privatekey);
 
   if (state->received_sni)
-    {
-    if ((Ustrcmp(state->exp_tls_certificate, saved_tls_certificate) == 0) &&
-        (Ustrcmp(state->exp_tls_privatekey, saved_tls_privatekey) == 0))
+    if (  Ustrcmp(state->exp_tls_certificate, saved_tls_certificate) == 0
+       && Ustrcmp(state->exp_tls_privatekey,  saved_tls_privatekey)  == 0
+       )
       {
       DEBUG(D_tls) debug_printf("TLS SNI: cert and key unchanged\n");
       }
@@ -812,7 +879,6 @@ if (state->exp_tls_certificate && *state->exp_tls_certificate)
       {
       DEBUG(D_tls) debug_printf("TLS SNI: have a changed cert/key pair.\n");
       }
-    }
 
   rc = gnutls_certificate_set_x509_key_file(state->x509_cred,
       CS state->exp_tls_certificate, CS state->exp_tls_privatekey,
@@ -831,18 +897,25 @@ if (  !host	/* server */
    && tls_ocsp_file
    )
   {
-  if (!expand_check(tls_ocsp_file, US"tls_ocsp_file",
-	&state->exp_tls_ocsp_file))
-    return DEFER;
+  if (gnutls_buggy_ocsp)
+    {
+    DEBUG(D_tls) debug_printf("GnuTLS library is buggy for OCSP; avoiding\n");
+    }
+  else
+    {
+    if (!expand_check(tls_ocsp_file, US"tls_ocsp_file",
+	  &state->exp_tls_ocsp_file))
+      return DEFER;
 
-  /* Use the full callback method for stapling just to get observability.
-  More efficient would be to read the file once only, if it never changed
-  (due to SNI). Would need restart on file update, or watch datestamp.  */
+    /* Use the full callback method for stapling just to get observability.
+    More efficient would be to read the file once only, if it never changed
+    (due to SNI). Would need restart on file update, or watch datestamp.  */
 
-  gnutls_certificate_set_ocsp_status_request_function(state->x509_cred,
-    server_ocsp_stapling_cb, state->exp_tls_ocsp_file);
+    gnutls_certificate_set_ocsp_status_request_function(state->x509_cred,
+      server_ocsp_stapling_cb, state->exp_tls_ocsp_file);
 
-  DEBUG(D_tls) debug_printf("Set OCSP response file %s\n", &state->exp_tls_ocsp_file);
+    DEBUG(D_tls) debug_printf("OCSP response file = %s\n", state->exp_tls_ocsp_file);
+    }
   }
 #endif
 
@@ -857,6 +930,10 @@ if (state->tls_verify_certificates && *state->tls_verify_certificates)
   {
   if (!expand_check_tlsvar(tls_verify_certificates))
     return DEFER;
+#ifndef SUPPORT_SYSDEFAULT_CABUNDLE
+  if (Ustrcmp(state->exp_tls_verify_certificates, "system") == 0)
+    state->exp_tls_verify_certificates = NULL;
+#endif
   if (state->tls_crl && *state->tls_crl)
     if (!expand_check_tlsvar(tls_crl))
       return DEFER;
@@ -896,7 +973,7 @@ else
   but who knows if someone has some weird FIFO which always dumps some certs, or
   other weirdness.  The thing we really want to check is that it's not a
   directory, since while OpenSSL supports that, GnuTLS does not.
-  So s/!S_ISREG/S_ISDIR/ and change some messsaging ... */
+  So s/!S_ISREG/S_ISDIR/ and change some messaging ... */
   if (S_ISDIR(statbuf.st_mode))
     {
     DEBUG(D_tls)
@@ -1007,6 +1084,38 @@ return OK;
 *            Initialize for GnuTLS               *
 *************************************************/
 
+
+#ifndef DISABLE_OCSP
+
+static BOOL
+tls_is_buggy_ocsp(void)
+{
+const uschar * s;
+uschar maj, mid, mic;
+
+s = CUS gnutls_check_version(NULL);
+maj = atoi(CCS s);
+if (maj == 3)
+  {
+  while (*s && *s != '.') s++;
+  mid = atoi(CCS ++s);
+  if (mid <= 2)
+    return TRUE;
+  else if (mid >= 5)
+    return FALSE;
+  else
+    {
+    while (*s && *s != '.') s++;
+    mic = atoi(CCS ++s);
+    return mic <= (mid == 3 ? 16 : 3);
+    }
+  }
+return FALSE;
+}
+
+#endif
+
+
 /* Called from both server and client code. In the case of a server, errors
 before actual TLS negotiation return DEFER.
 
@@ -1070,6 +1179,11 @@ if (!exim_gnutls_base_init_done)
     }
 #endif
 
+#ifndef DISABLE_OCSP
+  if (tls_ocsp_file && (gnutls_buggy_ocsp = tls_is_buggy_ocsp()))
+    log_write(0, LOG_MAIN, "OCSP unusable with this GnuTLS library version");
+#endif
+
   exim_gnutls_base_init_done = TRUE;
   }
 
@@ -1225,7 +1339,7 @@ static int
 peer_status(exim_gnutls_state_st *state)
 {
 uschar cipherbuf[256];
-const gnutls_datum *cert_list;
+const gnutls_datum_t *cert_list;
 int old_pool, rc;
 unsigned int cert_list_size = 0;
 gnutls_protocol_t protocol;
@@ -1394,9 +1508,9 @@ else
   if (state->exp_tls_verify_cert_hostnames)
     {
     int sep = 0;
-    uschar * list = state->exp_tls_verify_cert_hostnames;
+    const uschar * list = state->exp_tls_verify_cert_hostnames;
     uschar * name;
-    while (name = string_nextinlist(&list, &sep, NULL, 0))
+    while ((name = string_nextinlist(&list, &sep, NULL, 0)))
       if (gnutls_x509_crt_check_hostname(state->tlsp->peercert, CS name))
 	break;
     if (!name)
@@ -1546,7 +1660,7 @@ return 0;
 #endif
 
 
-#ifdef EXPERIMENTAL_EVENT
+#ifndef DISABLE_EVENT
 /*
 We use this callback to get observability and detail-level control
 for an exim TLS connection (either direction), raising a tls:cert event
@@ -1559,7 +1673,7 @@ Return 0 for the handshake to continue or non-zero to terminate.
 static int
 verify_cb(gnutls_session_t session)
 {
-const gnutls_datum * cert_list;
+const gnutls_datum_t * cert_list;
 unsigned int cert_list_size = 0;
 gnutls_x509_crt_t crt;
 int rc;
@@ -1670,7 +1784,7 @@ else
   gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_IGNORE);
   }
 
-#ifdef EXPERIMENTAL_EVENT
+#ifndef DISABLE_EVENT
 if (event_action)
   {
   state->event_action = event_action;
@@ -1701,32 +1815,36 @@ if (!state->tlsp->on_connect)
 that the GnuTLS library doesn't. */
 
 gnutls_transport_set_ptr2(state->session,
-    (gnutls_transport_ptr)(long) fileno(smtp_in),
-    (gnutls_transport_ptr)(long) fileno(smtp_out));
+    (gnutls_transport_ptr_t)(long) fileno(smtp_in),
+    (gnutls_transport_ptr_t)(long) fileno(smtp_out));
 state->fd_in = fileno(smtp_in);
 state->fd_out = fileno(smtp_out);
 
 sigalrm_seen = FALSE;
 if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout);
 do
-  {
   rc = gnutls_handshake(state->session);
-  } while ((rc == GNUTLS_E_AGAIN) ||
-      (rc == GNUTLS_E_INTERRUPTED && !sigalrm_seen));
+while (rc == GNUTLS_E_AGAIN ||  rc == GNUTLS_E_INTERRUPTED && !sigalrm_seen);
 alarm(0);
 
 if (rc != GNUTLS_E_SUCCESS)
   {
-  tls_error(US"gnutls_handshake",
-      sigalrm_seen ? "timed out" : gnutls_strerror(rc), NULL);
   /* It seems that, except in the case of a timeout, we have to close the
   connection right here; otherwise if the other end is running OpenSSL it hangs
   until the server times out. */
 
-  if (!sigalrm_seen)
+  if (sigalrm_seen)
+    tls_error(US"gnutls_handshake", "timed out", NULL);
+  else
     {
+    tls_error(US"gnutls_handshake", gnutls_strerror(rc), NULL);
+    gnutls_alert_send_appropriate(state->session, rc);
+    millisleep(500);
+    shutdown(fileno(smtp_out), SHUT_WR);
+    for (rc = 1024; fgetc(smtp_in) != EOF && rc > 0; ) rc--;	/* drain skt */
     (void)fclose(smtp_out);
     (void)fclose(smtp_in);
+    smtp_out = smtp_in = NULL;
     }
 
   return FAIL;
@@ -1751,8 +1869,7 @@ if (  state->verify_requirement != VERIFY_NONE
 
 /* Figure out peer DN, and if authenticated, etc. */
 
-rc = peer_status(state);
-if (rc != OK) return rc;
+if ((rc = peer_status(state)) != OK) return rc;
 
 /* Sets various Exim expansion variables; always safe within server */
 
@@ -1764,6 +1881,7 @@ and initialize appropriately. */
 state->xfer_buffer = store_malloc(ssl_xfer_buffer_size);
 
 receive_getc = tls_getc;
+receive_get_cache = tls_get_cache;
 receive_ungetc = tls_ungetc;
 receive_feof = tls_feof;
 receive_ferror = tls_ferror;
@@ -1781,7 +1899,12 @@ tls_client_setup_hostname_checks(host_item * host, exim_gnutls_state_st * state,
 {
 if (verify_check_given_host(&ob->tls_verify_cert_hostnames, host) == OK)
   {
-  state->exp_tls_verify_cert_hostnames = host->name;
+  state->exp_tls_verify_cert_hostnames =
+#ifdef SUPPORT_I18N
+    string_domain_utf8_to_alabel(host->name, NULL);
+#else
+    host->name;
+#endif
   DEBUG(D_tls)
     debug_printf("TLS: server cert verification includes hostname: \"%s\".\n",
 		    state->exp_tls_verify_cert_hostnames);
@@ -1810,7 +1933,7 @@ tls_client_start(int fd, host_item *host,
     address_item *addr ARG_UNUSED,
     transport_instance *tb
 #ifdef EXPERIMENTAL_DANE
-    , dne_answer * unused_tlsa_dnsa
+    , dns_answer * unused_tlsa_dnsa
 #endif
     )
 {
@@ -1850,13 +1973,13 @@ if ((rc = tls_init(host, ob->tls_certificate, ob->tls_privatekey,
   gnutls_dh_set_prime_bits(state->session, dh_min_bits);
   }
 
-/* Stick to the old behaviour for compatibility if tls_verify_certificates is 
+/* Stick to the old behaviour for compatibility if tls_verify_certificates is
 set but both tls_verify_hosts and tls_try_verify_hosts are unset. Check only
 the specified host patterns if one of them is defined */
 
 if (  (  state->exp_tls_verify_certificates
       && !ob->tls_verify_hosts
-      && !ob->tls_try_verify_hosts
+      && (!ob->tls_try_verify_hosts || !*ob->tls_try_verify_hosts)
       )
     || verify_check_given_host(&ob->tls_verify_hosts, host) == OK
    )
@@ -1896,7 +2019,7 @@ if (request_ocsp)
   }
 #endif
 
-#ifdef EXPERIMENTAL_EVENT
+#ifndef DISABLE_EVENT
 if (tb->event_action)
   {
   state->event_action = tb->event_action;
@@ -1905,7 +2028,7 @@ if (tb->event_action)
   }
 #endif
 
-gnutls_transport_set_ptr(state->session, (gnutls_transport_ptr)(long) fd);
+gnutls_transport_set_ptr(state->session, (gnutls_transport_ptr_t)(long) fd);
 state->fd_in = fd;
 state->fd_out = fd;
 
@@ -1922,8 +2045,13 @@ do
 alarm(0);
 
 if (rc != GNUTLS_E_SUCCESS)
-  return tls_error(US"gnutls_handshake",
-      sigalrm_seen ? "timed out" : gnutls_strerror(rc), state->host);
+  if (sigalrm_seen)
+    {
+    gnutls_alert_send(state->session, GNUTLS_AL_FATAL, GNUTLS_A_USER_CANCELED);
+    return tls_error(US"gnutls_handshake", "timed out", state->host);
+    }
+  else
+    return tls_error(US"gnutls_handshake", gnutls_strerror(rc), state->host);
 
 DEBUG(D_tls) debug_printf("gnutls_handshake was successful\n");
 
@@ -2000,7 +2128,7 @@ if (!state->tlsp || state->tlsp->active < 0) return;  /* TLS was not active */
 
 if (shutdown)
   {
-  DEBUG(D_tls) debug_printf("tls_close(): shutting down TLS\n");
+  DEBUG(D_tls) debug_printf("tls_close() from '%s': shutting down TLS\n");
   gnutls_bye(state->session, GNUTLS_SHUT_WR);
   }
 
@@ -2050,15 +2178,24 @@ if (state->xfer_buffer_lwm >= state->xfer_buffer_hwm)
     ssl_xfer_buffer_size);
   alarm(0);
 
-  /* A zero-byte return appears to mean that the TLS session has been
+  /* Timeouts do not get this far; see command_timeout_handler().
+     A zero-byte return appears to mean that the TLS session has been
      closed down, not that the socket itself has been closed down. Revert to
      non-TLS handling. */
 
-  if (inbytes == 0)
+  if (sigalrm_seen)
+    {
+    DEBUG(D_tls) debug_printf("Got tls read timeout\n");
+    state->xfer_error = 1;
+    return EOF;
+    }
+
+  else if (inbytes == 0)
     {
     DEBUG(D_tls) debug_printf("Got TLS_EOF\n");
 
     receive_getc = smtp_getc;
+    receive_get_cache = smtp_get_cache;
     receive_ungetc = smtp_ungetc;
     receive_feof = smtp_feof;
     receive_ferror = smtp_ferror;
@@ -2097,6 +2234,17 @@ if (state->xfer_buffer_lwm >= state->xfer_buffer_hwm)
 return state->xfer_buffer[state->xfer_buffer_lwm++];
 }
 
+void
+tls_get_cache()
+{
+#ifndef DISABLE_DKIM
+exim_gnutls_state_st * state = &state_server;
+int n = state->xfer_buffer_hwm - state->xfer_buffer_lwm;
+if (n > 0)
+  dkim_exim_verify_feed(state->xfer_buffer+state->xfer_buffer_lwm, n);
+#endif
+}
+