/mandos/release

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  • Committer: Teddy Hogeborn
  • Date: 2015-03-10 18:03:38 UTC
  • mto: (237.7.304 trunk)
  • mto: This revision was merged to the branch mainline in revision 325.
  • Revision ID: teddy@recompile.se-20150310180338-pcxw6r2qmw9k6br9
Add ":!RSA" to GnuTLS priority string, to disallow non-DHE kx.

If Mandos was somehow made to use a non-ephemeral Diffie-Hellman key
exchange algorithm in the TLS handshake, any saved network traffic
could then be decrypted later if the Mandos client key was obtained.
By default, Mandos uses ephemeral DH key exchanges which does not have
this problem, but a non-ephemeral key exchange algorithm was still
enabled by default.  The simplest solution is to simply turn that off,
which ensures that Mandos will always use ephemeral DH key exchanges.

There is a "PFS" priority string specifier, but we can't use it because:

1. Security-wise, it is a mix between "NORMAL" and "SECURE128" - it
   enables a lot more algorithms than "SECURE256".

2. It is only available since GnuTLS 3.2.4.

Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.

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Lines of Context:
debian/rules
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#!/usr/bin/make -f
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ifeq (,$(filter noopt,$(DEB_BUILD_OPTIONS)))
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    MAKEFLAGS += OPTIMIZE=-O0
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endif
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ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
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    NUMJOBS = $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
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    MAKEFLAGS += -j$(NUMJOBS)
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endif
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%:
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        dh $@
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        $(MAKE) DESTDIR=$(CURDIR)/debian/mandos-client \
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                install-client-nokey
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override_dh_fixperms-arch:
 
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override_dh_fixperms:
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        dh_fixperms --exclude etc/keys/mandos \
 
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                --exclude etc/mandos/clients.conf \
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                --exclude etc/mandos/plugins.d \
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                --exclude etc/mandos/plugin-helpers \
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                --exclude usr/lib/$(DEB_HOST_MULTIARCH)/mandos/plugins.d \
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                --exclude usr/lib/$(DEB_HOST_MULTIARCH)/mandos/plugin-helpers \
 
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                --exclude usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH 2>/dev/null)/mandos/plugins.d \
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                --exclude usr/share/doc/mandos-client/examples/network-hooks.d
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        chmod --recursive g-w -- \
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        "$(CURDIR)/debian/mandos-client/usr/share/doc/mandos-client/examples/network-hooks.d"
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override_dh_fixperms-indep:
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        dh_fixperms --exclude etc/mandos/clients.conf
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override_dh_auto_test-arch: ;
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#bpo## dpkg-shlibdeps sees the "libgnutls28-dev (>= 3.6.6) |
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#bpo## libgnutls28-dev (<< 3.6.0)," in the build-dependencies not as two
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#bpo## alternatives, but as an absolute dependency on libgnutls30 >= 3.6.6.
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#bpo## So we have to do this ugly hack to hide this build dependency if we
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#bpo## compiled with libgnutls30 << 3.6.0.
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#bpo#override_dh_shlibdeps-arch:
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#bpo#   -gnutls_version=$$(dpkg-query --showformat='$${Version}' \
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#bpo#           --show libgnutls30); \
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#bpo#   dpkg --compare-versions $$gnutls_version lt 3.6.0 \
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#bpo#           && { cp --archive debian/control debian/control.orig; sed --in-place --expression='s/libgnutls28-dev (>= 3\.6\.6) |//' debian/control; }
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#bpo#   dh_shlibdeps
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#bpo#   -gnutls_version=$$(dpkg-query --showformat='$${Version}' \
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#bpo#           --show libgnutls30); \
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#bpo#   dpkg --compare-versions $$gnutls_version lt 3.6.0 \
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#bpo#           && mv debian/control.orig debian/control