package/rsync: fix CVE-2020-14387

A flaw was found in rsync in versions since 3.2.0pre1. Rsync improperly
validates certificate with host mismatch vulnerability. A remote,
unauthenticated attacker could exploit the flaw by performing a
man-in-the-middle attack using a valid certificate for another hostname
which could compromise confidentiality and integrity of data transmitted
using rsync-ssl. The highest threat from this vulnerability is to data
confidentiality and integrity. This flaw affects rsync versions before
3.2.4.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Peter: add a comment explaining what patch fixes this CVE]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rsync/0001-rsync-ssl-Verify-the-hostname-in-the-certificate-when-using-openssl.patch

@@ -0,0 +1,29 @@
+From c3f7414c450faaf6a8281cc4a4403529aeb7d859 Mon Sep 17 00:00:00 2001
+From: Matt McCutchen <matt@mattmccutchen.net>
+Date: Wed, 26 Aug 2020 12:16:08 -0400
+Subject: [PATCH] rsync-ssl: Verify the hostname in the certificate when using
+ openssl.
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Retrieved from:
+https://git.samba.org/?p=rsync.git;a=commitdiff;h=c3f7414c450faaf6a8281cc4a4403529aeb7d859]
+---
+ rsync-ssl | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/rsync-ssl b/rsync-ssl
+index 8101975a..46701af1 100755
+--- a/rsync-ssl
++++ b/rsync-ssl
+@@ -129,7 +129,7 @@ function rsync_ssl_helper {
+     fi
+ 
+     if [[ $RSYNC_SSL_TYPE == openssl ]]; then
+-	exec $RSYNC_SSL_OPENSSL s_client $caopt $certopt -quiet -verify_quiet -servername $hostname -connect $hostname:$port
++	exec $RSYNC_SSL_OPENSSL s_client $caopt $certopt -quiet -verify_quiet -servername $hostname -verify_hostname $hostname -connect $hostname:$port
+     elif [[ $RSYNC_SSL_TYPE == gnutls ]]; then
+ 	exec $RSYNC_SSL_GNUTLS --logfile=/dev/null $gnutls_cert_opt $gnutls_opts $hostname:$port
+     else
+-- 
+2.25.1
+

package/rsync/rsync.mk

@@ -20,6 +20,9 @@ RSYNC_CONF_OPTS = \
 	--disable-lz4 \
 	--disable-asm
 
+# 0001-rsync-ssl-Verify-the-hostname-in-the-certificate-when-using-openssl.patch
+RSYNC_IGNORE_CVES += CVE-2020-14387
+
 ifeq ($(BR2_PACKAGE_ACL),y)
 RSYNC_DEPENDENCIES += acl
 else