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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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WARN=-O -Wall -Wformat=2 -Winit-self -Wmissing-include-dirs \
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        -Wswitch-default -Wswitch-enum -Wunused-parameter \
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        -Wstrict-aliasing=1 -Wextra -Wfloat-equal -Wundef -Wshadow \
 
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WARN=-O -Wall -Wextra -Wdouble-promotion -Wformat=2 -Winit-self \
 
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        -Wmissing-include-dirs -Wswitch-default -Wswitch-enum \
 
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        -Wunused -Wuninitialized -Wstrict-overflow=5 \
 
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        -Wsuggest-attribute=pure -Wsuggest-attribute=const \
 
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        -Wsuggest-attribute=noreturn -Wfloat-equal -Wundef -Wshadow \
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        -Wunsafe-loop-optimizations -Wpointer-arith \
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        -Wbad-function-cast -Wcast-qual -Wcast-align -Wwrite-strings \
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        -Wconversion -Wstrict-prototypes -Wold-style-definition \
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        -Wpacked -Wnested-externs -Winline -Wvolatile-register-var
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#       -Wunreachable-code
 
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        -Wconversion -Wlogical-op -Waggregate-return \
 
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        -Wstrict-prototypes -Wold-style-definition \
 
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        -Wmissing-format-attribute -Wnormalized=nfc -Wpacked \
 
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        -Wredundant-decls -Wnested-externs -Winline -Wvla \
 
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        -Wvolatile-register-var -Woverlength-strings
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#DEBUG=-ggdb3
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# For info about _FORTIFY_SOURCE, see
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# <http://www.kernel.org/doc/man-pages/online/pages/man7/feature_test_macros.7.html>
 
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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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LINK_FORTIFY_LD=-z relro -z now
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LINK_FORTIFY += -pie
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endif
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#COVERAGE=--coverage
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OPTIMIZE=-Os
 
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OPTIMIZE=-Os -fno-strict-aliasing
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LANGUAGE=-std=gnu99
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htmldir=man
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version=1.6.4
 
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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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        --param man.authors.section.enabled     0 \
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        /usr/share/xml/docbook/stylesheet/nwalsh/manpages/docbook.xsl \
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        $(notdir $<); \
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        $(MANPOST) $(notdir $@);\
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        if locale --all 2>/dev/null | grep --regexp='^en_US\.utf8$$' \
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        && type man 2>/dev/null; then LANG=en_US.UTF-8 MANWIDTH=80 \
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        man --warnings --encoding=UTF-8 --local-file $(notdir $@); \
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        fi >/dev/null)
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# DocBook-to-man post-processing to fix a '\n' escape bug
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MANPOST=$(SED) --in-place --expression='s,\\\\en,\\en,g;s,\\n,\\en,g'
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DOCBOOKTOHTML=$(strip xsltproc --nonet --xinclude \
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        --param make.year.ranges                1 \
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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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.PHONY : all doc html clean distclean run-client run-server install \
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        install-server install-client uninstall uninstall-server \
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        uninstall-client purge purge-server purge-client
 
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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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        uninstall-server uninstall-client purge purge-server \
 
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        purge-client
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clean:
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        -rm --force $(CPROGS) $(objects) $(htmldocs) $(DOCS) core
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        @echo "# ignored.  The messages are caused by not running as root, but   #"
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        @echo "# you should NOT run \"make run-client\" as root unless you also    #"
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        @echo "# unpacked and compiled Mandos as root, which is NOT recommended. #"
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        @echo "# From plugin-runner: setuid: Operation not permitted             #"
 
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        @echo "# From plugin-runner: setgid: Operation not permitted             #"
 
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        @echo "#                     setuid: Operation not permitted             #"
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        @echo "# From askpass-fifo:  mkfifo: Permission denied                   #"
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        @echo "# From mandos-client: setuid: Operation not permitted             #"
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        @echo "#                     seteuid: Operation not permitted            #"
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        @echo "#                     klogctl: Operation not permitted            #"
 
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        @echo "# From mandos-client:                                             #"
 
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        @echo "#             Failed to raise privileges: Operation not permitted #"
 
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        @echo "#             Warning: network hook \"*\" exited with status *      #"
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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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                --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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                $(CLIENTARGS)
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# Used by run-client
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        install --directory confdir
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        install --mode=u=rw $< $@
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# Add a client password
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        ./mandos-keygen --dir keydir --password >> $@
 
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        ./mandos-keygen --dir keydir --password --no-ssh >> $@
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statedir:
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        install --directory statedir
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