X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/00392be0e7cfb5c6c6ce173ff31d81ab2a2e8779..d4ff6d2a25234f7558baa99a54ca138c3f004b06:/src/src/tls-gnu.c

diff --git a/src/src/tls-gnu.c b/src/src/tls-gnu.c
index c3e2d98e8..3e8ec6d84 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) The Exim Maintainers 2020 - 2022 */
+/* Copyright (c) The Exim Maintainers 2020 - 2023 */
 /* Copyright (c) University of Cambridge 1995 - 2018 */
 /* Copyright (c) Phil Pennock 2012 */
 /* See the file NOTICE for conditions of use and distribution. */
@@ -727,7 +727,7 @@ file is never present. If two processes both compute some new parameters, you
 waste a bit of effort, but it doesn't seem worth messing around with locking to
 prevent this.
 
-Returns:     OK/DEFER/FAIL
+Returns:     OK/DEFER (expansion issue)/FAIL (requested none)
 */
 
 static int
@@ -765,7 +765,7 @@ else if (Ustrcmp(exp_tls_dhparam, "historic") == 0)
 else if (Ustrcmp(exp_tls_dhparam, "none") == 0)
   {
   DEBUG(D_tls) debug_printf("Requested no DH parameters\n");
-  return OK;
+  return FAIL;
   }
 else if (exp_tls_dhparam[0] != '/')
   {
@@ -1016,7 +1016,7 @@ now = 1;
 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, (long)2 * 60 * 60))	/* 2 hour */
+   || (rc = gnutls_x509_crt_set_expiration_time(cert, now + (long)2 * 60 * 60))	/* 2 hour */
    || (rc = gnutls_x509_crt_set_key(cert, pkey))
 
    || (rc = gnutls_x509_crt_set_dn_by_oid(cert,
@@ -1185,6 +1185,8 @@ tls_server_servercerts_cb(gnutls_session_t session, unsigned int htype,
 # ifdef notdef_crashes
 				/*XXX crashes */
 return gnutls_ext_raw_parse(NULL, tls_server_servercerts_ext, msg, 0);
+# else
+return GNUTLS_E_SUCCESS;
 # endif
 }
 #endif /*SUPPORT_GNUTLS_EXT_RAW_PARSE*/
@@ -1233,7 +1235,7 @@ switch (htype)
     return tls_server_ticket_cb(sess, htype, when, incoming, msg);
 # endif
   default:
-    return 0;
+    return GNUTLS_E_SUCCESS;
   }
 }
 #endif
@@ -2002,10 +2004,10 @@ Returns:          OK/DEFER/FAIL
 */
 
 static int
-tls_set_remaining_x509(exim_gnutls_state_st *state, uschar ** errstr)
+tls_set_remaining_x509(exim_gnutls_state_st * state, uschar ** errstr)
 {
-int rc;
-const host_item *host = state->host;  /* macro should be reconsidered? */
+int rc = OK;
+const host_item * host = state->host;  /* macro should be reconsidered? */
 
 /* Create D-H parameters, or read them from the cache file. This function does
 its own SMTP error messaging. This only happens for the server, TLS D-H ignores
@@ -2014,11 +2016,13 @@ client-side params. */
 if (!state->host)
   {
   if (!dh_server_params)
-    if ((rc = init_server_dh(errstr)) != OK) return rc;
+    if ((rc = init_server_dh(errstr)) == DEFER) return rc;
 
   /* Unnecessary & discouraged with 3.6.0 or later, according to docs.  But without it,
   no DHE- ciphers are advertised. */
-  gnutls_certificate_set_dh_params(state->lib_state.x509_cred, dh_server_params);
+
+  if (rc == OK)
+    gnutls_certificate_set_dh_params(state->lib_state.x509_cred, dh_server_params);
   }
 
 /* Link the credentials to the session. */
@@ -2849,7 +2853,7 @@ static int
 tls_server_ticket_cb(gnutls_session_t sess, u_int htype, unsigned when,
   unsigned incoming, const gnutls_datum_t * msg)
 {
-DEBUG(D_tls) debug_printf("newticket cb\n");
+DEBUG(D_tls) debug_printf("newticket cb (on server)\n");
 tls_in.resumption |= RESUME_CLIENT_REQUESTED;
 return 0;
 }
@@ -2886,9 +2890,12 @@ tls_server_resume_posthandshake(exim_gnutls_state_st * state)
 {
 if (gnutls_session_resumption_requested(state->session))
   {
-  /* This tells us the client sent a full ticket.  We use a
+  /* This tells us the client sent a full (?) ticket.  We use a
   callback on session-ticket request, elsewhere, to tell
-  if a client asked for a ticket. */
+  if a client asked for a ticket.
+  XXX As of GnuTLS 3.0.1 it seems to be returning true even for
+  a pure ticket-req (a zero-length Session Ticket extension
+  in the Client Hello, for 1.2) which mucks up our logic. */
 
   tls_in.resumption |= RESUME_CLIENT_SUGGESTED;
   DEBUG(D_tls) debug_printf("client requested resumption\n");
@@ -2998,7 +3005,7 @@ exim_gnutls_state_st * state = NULL;
 if (tls_in.active.sock >= 0)
   {
   tls_error(US"STARTTLS received after TLS started", US "", NULL, errstr);
-  smtp_printf("554 Already in TLS\r\n", FALSE);
+  smtp_printf("554 Already in TLS\r\n", SP_NO_MORE);
   return FAIL;
   }
 
@@ -3077,7 +3084,7 @@ mode, the fflush() happens when smtp_getc() is called. */
 
 if (!state->tlsp->on_connect)
   {
-  smtp_printf("220 TLS go ahead\r\n", FALSE);
+  smtp_printf("220 TLS go ahead\r\n", SP_NO_MORE);
   fflush(smtp_out);
   }
 
@@ -3317,7 +3324,8 @@ tls_retrieve_session(tls_support * tlsp, gnutls_session_t session,
 tlsp->resumption = RESUME_SUPPORTED;
 
 if (!conn_args->have_lbserver)
-  { DEBUG(D_tls) debug_printf("resumption not supported on continued-connection\n"); }
+  { DEBUG(D_tls) debug_printf(
+      "resumption not supported: no LB detection done (continued-conn?)\n"); }
 else if (verify_check_given_host(CUSS &ob->tls_resumption_hosts, conn_args->host) == OK)
   {
   dbdata_tls_session * dt;
@@ -3345,6 +3353,7 @@ else if (verify_check_given_host(CUSS &ob->tls_resumption_hosts, conn_args->host
     dbfn_close(dbm_file);
     }
   }
+else DEBUG(D_tls) debug_printf("no resumption for this host\n");
 }
 
 
@@ -3372,7 +3381,7 @@ if (gnutls_session_get_flags(session) & GNUTLS_SFLAGS_SESSION_TICKET)
       int dlen = sizeof(dbdata_tls_session) + tkt.size;
       dbdata_tls_session * dt = store_get(dlen, GET_TAINTED);
 
-      DEBUG(D_tls) debug_printf("session data size %u\n", (unsigned)tkt.size);
+      DEBUG(D_tls) debug_printf(" session data size %u\n", (unsigned)tkt.size);
       memcpy(dt->session, tkt.data, tkt.size);
       gnutls_free(tkt.data);
 
@@ -3383,11 +3392,15 @@ if (gnutls_session_get_flags(session) & GNUTLS_SFLAGS_SESSION_TICKET)
 	dbfn_close(dbm_file);
 
 	DEBUG(D_tls)
-	  debug_printf("wrote session db (len %u)\n", (unsigned)dlen);
+	  debug_printf(" wrote session db (len %u)\n", (unsigned)dlen);
 	}
       }
-    else DEBUG(D_tls)
-      debug_printf("extract session data: %s\n", US gnutls_strerror(rc));
+    else
+      { DEBUG(D_tls)
+      debug_printf(" extract session data: %s\n", US gnutls_strerror(rc));
+      }
+  else DEBUG(D_tls)
+      debug_printf(" host not resmable; not saving ticket\n");
   }
 }
 
@@ -3404,7 +3417,7 @@ tls_client_ticket_cb(gnutls_session_t sess, u_int htype, unsigned when,
 exim_gnutls_state_st * state = gnutls_session_get_ptr(sess);
 tls_support * tlsp = state->tlsp;
 
-DEBUG(D_tls) debug_printf("newticket cb\n");
+DEBUG(D_tls) debug_printf("newticket cb (on client)\n");
 
 if (!tlsp->ticket_received)
   tls_save_session(tlsp, sess, state->host);