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dropbear: hide dropbear version

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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 _]
This commit is contained in:
Kevin Darbyshire-Bryant 2016-09-07 17:23:51 +01:00 committed by Felix Fietkau
parent ca356887ed
commit 96f0bbe91d
1 changed files with 4 additions and 0 deletions
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4
package/network/services/dropbear/Makefile
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@ -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