From 96f0bbe91d2176284324c4d9b4839b6878148602 Mon Sep 17 00:00:00 2001 From: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk> Date: Wed, 7 Sep 2016 17:23:51 +0100 Subject: [PATCH] dropbear: hide dropbear version As security precaution and to limit the attack surface based on the version reported by tools like nmap mask out the dropbear version so the version is not visible anymore by snooping on the wire. Version is still visible by 'dropbear -V' Based on a patch by Hans Dedecker <dedeckeh@gmail.com> Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk> Signed-off-by: Felix Fietkau <nbd@nbd.name> [remove trailing _] --- package/network/services/dropbear/Makefile | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/package/network/services/dropbear/Makefile b/package/network/services/dropbear/Makefile index 36bcb4ab7b..b80f4d5c81 100644 --- a/package/network/services/dropbear/Makefile +++ b/package/network/services/dropbear/Makefile @@ -105,6 +105,10 @@ define Build/Configure mv $(PKG_BUILD_DIR)/options.h.new $(PKG_BUILD_DIR)/options.h || exit 1; \ done + # remove protocol idented software version number + $(SED) 's,^#define LOCAL_IDENT .*$$$$,#define LOCAL_IDENT "SSH-2.0-dropbear",g' \ + $(PKG_BUILD_DIR)/sysoptions.h + # Enforce rebuild of svr-chansession.c rm -f $(PKG_BUILD_DIR)/svr-chansession.o endef -- GitLab