Enforce STARTTLS sync point, client side

[users/heiko/exim.git] / src / src / transports / smtp.c

diff --git a/src/src/transports/smtp.c b/src/src/transports/smtp.c
index 3d41a6767413df71fe04c91110f3d916a0d55dfe..341acde2d6ab4275fbd997bb8b2ca3d14522be37 100644 (file)
--- a/src/src/transports/smtp.c
+++ b/src/src/transports/smtp.c
@@ -364,10 +364,6 @@ smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
 {
 smtp_transport_options_block *ob = SOB tblock->options_block;
 
-errmsg = errmsg;    /* Keep picky compilers happy */
-uid = uid;
-gid = gid;
-
 /* Pass back options if required. This interface is getting very messy. */
 
 if (tf)
@@ -2465,9 +2461,7 @@ if (  smtp_peer_options & OPTION_TLS
       /* TLS negotiation failed; give an error. From outside, this function may
       be called again to try in clear on a new connection, if the options permit
       it for this host. */
-#ifdef USE_GNUTLS
-  GNUTLS_CONN_FAILED:
-#endif
+  TLS_CONN_FAILED:
       DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
 
 # ifdef SUPPORT_DANE
@@ -2489,7 +2483,23 @@ if (  smtp_peer_options & OPTION_TLS
       goto TLS_FAILED;
       }
 
-    /* TLS session is set up */
+    /* TLS session is set up.  Check the inblock fill level.  If there is
+    content then as we have not yet done a tls read it must have arrived before
+    the TLS handshake, in-clear.  That violates the sync requirement of the
+    STARTTLS RFC, so fail. */
+
+    if (sx->inblock.ptr != sx->inblock.ptrend)
+      {
+      DEBUG(D_tls)
+       {
+       int i = sx->inblock.ptrend - sx->inblock.ptr;
+       debug_printf("unused data in input buffer after ack for STARTTLS:\n"
+         "'%.*s'%s\n",
+         i > 100 ? 100 : i, sx->inblock.ptr, i > 100 ? "..." : "");
+       }
+      tls_errstr = US"synch error before connect";
+      goto TLS_CONN_FAILED;
+      }
 
     smtp_peer_options_wrap = smtp_peer_options;
     for (address_item * addr = sx->addrlist; addr; addr = addr->next)
@@ -2594,7 +2604,7 @@ if (tls_out.active.sock >= 0)
       Can it do that, with all the flexibility we need? */
 
       tls_errstr = US"error on first read";
-      goto GNUTLS_CONN_FAILED;
+      goto TLS_CONN_FAILED;
       }
 #else
       goto RESPONSE_FAILED;
@@ -3432,7 +3442,6 @@ uschar *message = NULL;
 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
 smtp_context * sx = store_get(sizeof(*sx), TRUE);      /* tainted, for the data buffers */
 
-suppress_tls = suppress_tls;  /* stop compiler warning when no TLS support */
 *message_defer = FALSE;
 
 memset(sx, 0, sizeof(*sx));