GnuTLS control constants exposed to Makefile.

[exim.git] / src / README.UPDATING

diff --git a/src/README.UPDATING b/src/README.UPDATING
index 81e767efea826ca550b1de7743b1cdc99eb5cfb7..62d1d2745010e9dc5f385480e1ce7643b1752bbc 100644 (file)
--- a/src/README.UPDATING
+++ b/src/README.UPDATING
@@ -26,9 +26,12 @@ The rest of this document contains information about changes in 4.xx releases
 that might affect a running system.
 
 
-Exim version 4.78
+Exim version 4.80
 -----------------
 
+ * BEWARE backwards-incompatible changes in SSL libraries, thus the version
+   bump.  See points below for details.
+
  * The value of $tls_peerdn is now print-escaped when written to the spool file
    in a -tls_peerdn line, and unescaped when read back in.  We received reports
    of values with embedded newlines, which caused spool file corruption.
@@ -96,6 +99,11 @@ Exim version 4.78
    parsing entirely and the presence of the options will be a configuration
    error.
 
+   Note that by default, GnuTLS will not accept RSA-MD5 signatures in chains.
+   A tls_require_ciphers value of NORMAL:%VERIFY_ALLOW_SIGN_RSA_MD5 may
+   re-enable support, but this is not supported by the Exim maintainers.
+   Our test suite no longer includes MD5-based certificates.
+
    This rewrite means that Exim will continue to build against GnuTLS in the
    future, brings Exim closer to other GnuTLS applications and lets us add
    support for SNI and other features more readily.  We regret that it wasn't
@@ -111,6 +119,9 @@ Exim version 4.77
    problem.  Prior to this release, supported values were "TLS1" and "SSL3",
    so you should be able to update configuration prior to update.
 
+    [nb: gnutls_require_protocols removed in Exim 4.80, instead use
+         tls_require_ciphers to provide a priority string; see notes above]
+
  * The match_<type>{string1}{string2} expansion conditions no longer subject
    string2 to string expansion, unless Exim was built with the new
    "EXPAND_LISTMATCH_RHS" option.  Too many people have inadvertently created