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  • Committer: Teddy Hogeborn
  • Date: 2015-03-10 18:03:38 UTC
  • 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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Makefile
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# For info about _FORTIFY_SOURCE, see feature_test_macros(7)
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# and <http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html>.
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FORTIFY=-D_FORTIFY_SOURCE=2 -fstack-protector-all -fPIC
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# <https://developerblog.redhat.com/2014/10/16/gcc-undefined-behavior-sanitizer-ubsan/>
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ALL_SANITIZE_OPTIONS:=-fsanitize=address -fsanitize=undefined \
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        -fsanitize=shift -fsanitize=integer-divide-by-zero \
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        -fsanitize=unreachable -fsanitize=vla-bound -fsanitize=null \
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        -fsanitize=return -fsanitize=signed-integer-overflow \
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        -fsanitize=bounds -fsanitize=alignment \
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        -fsanitize=object-size -fsanitize=float-divide-by-zero \
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        -fsanitize=float-cast-overflow -fsanitize=nonnull-attribute \
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        -fsanitize=returns-nonnull-attribute -fsanitize=bool \
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        -fsanitize=enum
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# Check which sanitizing options can be used
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SANITIZE:=$(foreach option,$(ALL_SANITIZE_OPTIONS),$(shell \
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        echo 'int main(){}' | $(CC) --language=c $(option) /dev/stdin \
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        -o /dev/null >/dev/null 2>&1 && echo $(option)))
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LINK_FORTIFY_LD=-z relro -z now
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LINK_FORTIFY=
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endif
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#COVERAGE=--coverage
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OPTIMIZE=-Os -fno-strict-aliasing
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LANGUAGE=-std=gnu11
 
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LANGUAGE=-std=gnu99
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htmldir=man
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version=1.7.9
 
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version=1.6.9
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SED=sed
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USER=$(firstword $(subst :, ,$(shell getent passwd _mandos || getent passwd nobody || echo 65534)))
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GROUP=$(firstword $(subst :, ,$(shell getent group _mandos || getent group nogroup || echo 65534)))
 
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GROUP=$(firstword $(subst :, ,$(shell getent group _mandos || getent group nobody || echo 65534)))
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## Use these settings for a traditional /usr/local install
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# PREFIX=$(DESTDIR)/usr/local
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##
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SYSTEMD=$(DESTDIR)$(shell pkg-config systemd --variable=systemdsystemunitdir)
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TMPFILES=$(DESTDIR)$(shell pkg-config systemd --variable=tmpfilesdir)
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GNUTLS_CFLAGS=$(shell pkg-config --cflags-only-I gnutls)
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GNUTLS_LIBS=$(shell pkg-config --libs gnutls)
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GPGME_CFLAGS=$(shell gpgme-config --cflags; getconf LFS_CFLAGS)
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GPGME_LIBS=$(shell gpgme-config --libs; getconf LFS_LIBS; \
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        getconf LFS_LDFLAGS)
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LIBNL3_CFLAGS=$(shell pkg-config --cflags-only-I libnl-route-3.0)
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LIBNL3_LIBS=$(shell pkg-config --libs libnl-route-3.0)
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# Do not change these two
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CFLAGS+=$(WARN) $(DEBUG) $(FORTIFY) $(SANITIZE) $(COVERAGE) \
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        $(OPTIMIZE) $(LANGUAGE) $(GNUTLS_CFLAGS) $(AVAHI_CFLAGS) \
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        $(GPGME_CFLAGS) -DVERSION='"$(version)"'
 
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CFLAGS+=$(WARN) $(DEBUG) $(FORTIFY) $(COVERAGE) $(OPTIMIZE) \
 
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        $(LANGUAGE) $(GNUTLS_CFLAGS) $(AVAHI_CFLAGS) $(GPGME_CFLAGS) \
 
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        -DVERSION='"$(version)"'
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LDFLAGS+=-Xlinker --as-needed $(COVERAGE) $(LINK_FORTIFY) $(foreach flag,$(LINK_FORTIFY_LD),-Xlinker $(flag))
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# Commands to format a DocBook <refentry> document into a manual page
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PLUGINS=plugins.d/password-prompt plugins.d/mandos-client \
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        plugins.d/usplash plugins.d/splashy plugins.d/askpass-fifo \
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        plugins.d/plymouth
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PLUGIN_HELPERS=plugin-helpers/mandos-client-iprouteadddel
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CPROGS=plugin-runner $(PLUGINS) $(PLUGIN_HELPERS)
 
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CPROGS=plugin-runner $(PLUGINS)
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PROGS=mandos mandos-keygen mandos-ctl mandos-monitor $(CPROGS)
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DOCS=mandos.8 mandos-keygen.8 mandos-monitor.8 mandos-ctl.8 \
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        mandos.conf.5 mandos-clients.conf.5 plugin-runner.8mandos \
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        $(LINK.c) $^ -lrt $(GNUTLS_LIBS) $(AVAHI_LIBS) $(strip\
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                ) $(GPGME_LIBS) $(LOADLIBES) $(LDLIBS) -o $@
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plugin-helpers/mandos-client-iprouteadddel: plugin-helpers/mandos-client-iprouteadddel.c
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        $(LINK.c) $(LIBNL3_CFLAGS) $^ $(LIBNL3_LIBS) $(strip\
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                ) $(LOADLIBES) $(LDLIBS) -o $@
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.PHONY : all doc html clean distclean mostlyclean maintainer-clean \
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        check run-client run-server install install-html \
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        install-server install-client-nokey install-client uninstall \
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        @echo "###################################################################"
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# We set GNOME_KEYRING_CONTROL to block pam_gnome_keyring
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        ./plugin-runner --plugin-dir=plugins.d \
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                --plugin-helper-dir=plugin-helpers \
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                --config-file=plugin-runner.conf \
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                --options-for=mandos-client:--seckey=keydir/seckey.txt,--pubkey=keydir/pubkey.txt,--network-hook-dir=network-hooks.d \
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                --env-for=mandos-client:GNOME_KEYRING_CONTROL= \
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        elif install --directory --mode=u=rwx $(STATEDIR); then \
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                chown -- $(USER):$(GROUP) $(STATEDIR) || :; \
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        fi
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        if [ "$(TMPFILES)" != "$(DESTDIR)" -a -d "$(TMPFILES)" ]; then \
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                install --mode=u=rw,go=r tmpfiles.d-mandos.conf \
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                        $(TMPFILES)/mandos.conf; \
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        fi
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        install --mode=u=rwx,go=rx mandos $(PREFIX)/sbin/mandos
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        install --mode=u=rwx,go=rx --target-directory=$(PREFIX)/sbin \
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                mandos-ctl
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install-client-nokey: all doc
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        install --directory $(LIBDIR)/mandos $(CONFDIR)
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        install --directory --mode=u=rwx $(KEYDIR) \
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                $(LIBDIR)/mandos/plugins.d \
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                $(LIBDIR)/mandos/plugin-helpers
 
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                $(LIBDIR)/mandos/plugins.d
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        if [ "$(CONFDIR)" != "$(LIBDIR)/mandos" ]; then \
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                install --mode=u=rwx \
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                        --directory "$(CONFDIR)/plugins.d" \
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                        "$(CONFDIR)/plugin-helpers"; \
 
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                        --directory "$(CONFDIR)/plugins.d"; \
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        fi
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        install --mode=u=rwx,go=rx --directory \
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                "$(CONFDIR)/network-hooks.d"
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        install --mode=u=rwxs,go=rx \
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                --target-directory=$(LIBDIR)/mandos/plugins.d \
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                plugins.d/plymouth
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        install --mode=u=rwx,go=rx \
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                --target-directory=$(LIBDIR)/mandos/plugin-helpers \
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                plugin-helpers/mandos-client-iprouteadddel
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        install initramfs-tools-hook \
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                $(INITRAMFSTOOLS)/hooks/mandos
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        install --mode=u=rw,go=r initramfs-tools-hook-conf \