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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
1
 
WARN:=-O -Wall -Wextra -Wdouble-promotion -Wformat=2 -Winit-self \
 
1
WARN=-O -Wall -Wextra -Wdouble-promotion -Wformat=2 -Winit-self \
2
2
        -Wmissing-include-dirs -Wswitch-default -Wswitch-enum \
3
3
        -Wunused -Wuninitialized -Wstrict-overflow=5 \
4
4
        -Wsuggest-attribute=pure -Wsuggest-attribute=const \
10
10
        -Wmissing-format-attribute -Wnormalized=nfc -Wpacked \
11
11
        -Wredundant-decls -Wnested-externs -Winline -Wvla \
12
12
        -Wvolatile-register-var -Woverlength-strings
13
 
#DEBUG:=-ggdb3 -fsanitize=address 
 
13
#DEBUG=-ggdb3
14
14
# For info about _FORTIFY_SOURCE, see feature_test_macros(7)
15
 
# and <https://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html>.
16
 
FORTIFY:=-D_FORTIFY_SOURCE=2 -fstack-protector-all -fPIC
17
 
# <https://developerblog.redhat.com/2014/10/16/gcc-undefined-behavior-sanitizer-ubsan/>
18
 
ALL_SANITIZE_OPTIONS:=-fsanitize=leak -fsanitize=undefined \
19
 
        -fsanitize=shift -fsanitize=integer-divide-by-zero \
20
 
        -fsanitize=unreachable -fsanitize=vla-bound -fsanitize=null \
21
 
        -fsanitize=return -fsanitize=signed-integer-overflow \
22
 
        -fsanitize=bounds -fsanitize=alignment \
23
 
        -fsanitize=object-size -fsanitize=float-divide-by-zero \
24
 
        -fsanitize=float-cast-overflow -fsanitize=nonnull-attribute \
25
 
        -fsanitize=returns-nonnull-attribute -fsanitize=bool \
26
 
        -fsanitize=enum
27
 
# Check which sanitizing options can be used
28
 
SANITIZE:=$(foreach option,$(ALL_SANITIZE_OPTIONS),$(shell \
29
 
        echo 'int main(){}' | $(CC) --language=c $(option) /dev/stdin \
30
 
        -o /dev/null >/dev/null 2>&1 && echo $(option)))
31
 
LINK_FORTIFY_LD:=-z relro -z now
32
 
LINK_FORTIFY:=
 
15
# and <http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html>.
 
16
FORTIFY=-D_FORTIFY_SOURCE=2 -fstack-protector-all -fPIC
 
17
LINK_FORTIFY_LD=-z relro -z now
 
18
LINK_FORTIFY=
33
19
 
34
20
# If BROKEN_PIE is set, do not build with -pie
35
21
ifndef BROKEN_PIE
37
23
LINK_FORTIFY += -pie
38
24
endif
39
25
#COVERAGE=--coverage
40
 
OPTIMIZE:=-Os -fno-strict-aliasing
41
 
LANGUAGE:=-std=gnu11
42
 
htmldir:=man
43
 
version:=1.8.3
44
 
SED:=sed
 
26
OPTIMIZE=-Os -fno-strict-aliasing
 
27
LANGUAGE=-std=gnu99
 
28
htmldir=man
 
29
version=1.6.9
 
30
SED=sed
45
31
 
46
 
USER:=$(firstword $(subst :, ,$(shell getent passwd _mandos || getent passwd nobody || echo 65534)))
47
 
GROUP:=$(firstword $(subst :, ,$(shell getent group _mandos || getent group nogroup || echo 65534)))
 
32
USER=$(firstword $(subst :, ,$(shell getent passwd _mandos || getent passwd nobody || echo 65534)))
 
33
GROUP=$(firstword $(subst :, ,$(shell getent group _mandos || getent group nobody || echo 65534)))
48
34
 
49
35
## Use these settings for a traditional /usr/local install
50
 
# PREFIX:=$(DESTDIR)/usr/local
51
 
# CONFDIR:=$(DESTDIR)/etc/mandos
52
 
# KEYDIR:=$(DESTDIR)/etc/mandos/keys
53
 
# MANDIR:=$(PREFIX)/man
54
 
# INITRAMFSTOOLS:=$(DESTDIR)/etc/initramfs-tools
55
 
# STATEDIR:=$(DESTDIR)/var/lib/mandos
56
 
# LIBDIR:=$(PREFIX)/lib
 
36
# PREFIX=$(DESTDIR)/usr/local
 
37
# CONFDIR=$(DESTDIR)/etc/mandos
 
38
# KEYDIR=$(DESTDIR)/etc/mandos/keys
 
39
# MANDIR=$(PREFIX)/man
 
40
# INITRAMFSTOOLS=$(DESTDIR)/etc/initramfs-tools
 
41
# STATEDIR=$(DESTDIR)/var/lib/mandos
 
42
# LIBDIR=$(PREFIX)/lib
57
43
##
58
44
 
59
45
## These settings are for a package-type install
60
 
PREFIX:=$(DESTDIR)/usr
61
 
CONFDIR:=$(DESTDIR)/etc/mandos
62
 
KEYDIR:=$(DESTDIR)/etc/keys/mandos
63
 
MANDIR:=$(PREFIX)/share/man
64
 
INITRAMFSTOOLS:=$(DESTDIR)/usr/share/initramfs-tools
65
 
STATEDIR:=$(DESTDIR)/var/lib/mandos
66
 
LIBDIR:=$(shell \
 
46
PREFIX=$(DESTDIR)/usr
 
47
CONFDIR=$(DESTDIR)/etc/mandos
 
48
KEYDIR=$(DESTDIR)/etc/keys/mandos
 
49
MANDIR=$(PREFIX)/share/man
 
50
INITRAMFSTOOLS=$(DESTDIR)/usr/share/initramfs-tools
 
51
STATEDIR=$(DESTDIR)/var/lib/mandos
 
52
LIBDIR=$(shell \
67
53
        for d in \
68
54
        "/usr/lib/`dpkg-architecture -qDEB_HOST_MULTIARCH 2>/dev/null`" \
69
55
        "`rpm --eval='%{_libdir}' 2>/dev/null`" /usr/lib; do \
74
60
        done)
75
61
##
76
62
 
77
 
SYSTEMD:=$(DESTDIR)$(shell pkg-config systemd --variable=systemdsystemunitdir)
78
 
TMPFILES:=$(DESTDIR)$(shell pkg-config systemd --variable=tmpfilesdir)
 
63
SYSTEMD=$(DESTDIR)$(shell pkg-config systemd --variable=systemdsystemunitdir)
79
64
 
80
 
GNUTLS_CFLAGS:=$(shell pkg-config --cflags-only-I gnutls)
81
 
GNUTLS_LIBS:=$(shell pkg-config --libs gnutls)
82
 
AVAHI_CFLAGS:=$(shell pkg-config --cflags-only-I avahi-core)
83
 
AVAHI_LIBS:=$(shell pkg-config --libs avahi-core)
84
 
GPGME_CFLAGS:=$(shell gpgme-config --cflags; getconf LFS_CFLAGS)
85
 
GPGME_LIBS:=$(shell gpgme-config --libs; getconf LFS_LIBS; \
 
65
GNUTLS_CFLAGS=$(shell pkg-config --cflags-only-I gnutls)
 
66
GNUTLS_LIBS=$(shell pkg-config --libs gnutls)
 
67
AVAHI_CFLAGS=$(shell pkg-config --cflags-only-I avahi-core)
 
68
AVAHI_LIBS=$(shell pkg-config --libs avahi-core)
 
69
GPGME_CFLAGS=$(shell gpgme-config --cflags; getconf LFS_CFLAGS)
 
70
GPGME_LIBS=$(shell gpgme-config --libs; getconf LFS_LIBS; \
86
71
        getconf LFS_LDFLAGS)
87
 
LIBNL3_CFLAGS:=$(shell pkg-config --cflags-only-I libnl-route-3.0)
88
 
LIBNL3_LIBS:=$(shell pkg-config --libs libnl-route-3.0)
89
72
 
90
73
# Do not change these two
91
 
CFLAGS+=$(WARN) $(DEBUG) $(FORTIFY) $(SANITIZE) $(COVERAGE) \
92
 
        $(OPTIMIZE) $(LANGUAGE) -DVERSION='"$(version)"'
 
74
CFLAGS+=$(WARN) $(DEBUG) $(FORTIFY) $(COVERAGE) $(OPTIMIZE) \
 
75
        $(LANGUAGE) $(GNUTLS_CFLAGS) $(AVAHI_CFLAGS) $(GPGME_CFLAGS) \
 
76
        -DVERSION='"$(version)"'
93
77
LDFLAGS+=-Xlinker --as-needed $(COVERAGE) $(LINK_FORTIFY) $(foreach flag,$(LINK_FORTIFY_LD),-Xlinker $(flag))
94
78
 
95
79
# Commands to format a DocBook <refentry> document into a manual page
116
100
        /usr/share/xml/docbook/stylesheet/nwalsh/xhtml/docbook.xsl \
117
101
        $<; $(HTMLPOST) $@)
118
102
# Fix citerefentry links
119
 
HTMLPOST:=$(SED) --in-place \
 
103
HTMLPOST=$(SED) --in-place \
120
104
        --expression='s/\(<a class="citerefentry" href="\)\("><span class="citerefentry"><span class="refentrytitle">\)\([^<]*\)\(<\/span>(\)\([^)]*\)\()<\/span><\/a>\)/\1\3.\5\2\3\4\5\6/g'
121
105
 
122
 
PLUGINS:=plugins.d/password-prompt plugins.d/mandos-client \
 
106
PLUGINS=plugins.d/password-prompt plugins.d/mandos-client \
123
107
        plugins.d/usplash plugins.d/splashy plugins.d/askpass-fifo \
124
108
        plugins.d/plymouth
125
 
PLUGIN_HELPERS:=plugin-helpers/mandos-client-iprouteadddel
126
 
CPROGS:=plugin-runner $(PLUGINS) $(PLUGIN_HELPERS)
127
 
PROGS:=mandos mandos-keygen mandos-ctl mandos-monitor $(CPROGS)
128
 
DOCS:=mandos.8 mandos-keygen.8 mandos-monitor.8 mandos-ctl.8 \
 
109
CPROGS=plugin-runner $(PLUGINS)
 
110
PROGS=mandos mandos-keygen mandos-ctl mandos-monitor $(CPROGS)
 
111
DOCS=mandos.8 mandos-keygen.8 mandos-monitor.8 mandos-ctl.8 \
129
112
        mandos.conf.5 mandos-clients.conf.5 plugin-runner.8mandos \
130
113
        plugins.d/mandos-client.8mandos \
131
114
        plugins.d/password-prompt.8mandos plugins.d/usplash.8mandos \
132
115
        plugins.d/splashy.8mandos plugins.d/askpass-fifo.8mandos \
133
116
        plugins.d/plymouth.8mandos intro.8mandos
134
117
 
135
 
htmldocs:=$(addsuffix .xhtml,$(DOCS))
 
118
htmldocs=$(addsuffix .xhtml,$(DOCS))
136
119
 
137
 
objects:=$(addsuffix .o,$(CPROGS))
 
120
objects=$(addsuffix .o,$(CPROGS))
138
121
 
139
122
all: $(PROGS) mandos.lsm
140
123
 
252
235
                --expression='s/\(mandos_\)[0-9.]\+\(\.orig\.tar\.gz\)/\1$(version)\2/' \
253
236
                $@)
254
237
 
255
 
# Need to add the GnuTLS, Avahi and GPGME libraries, and can't use
256
 
# -fsanitize=leak because GnuTLS and GPGME both leak memory.
257
238
plugins.d/mandos-client: plugins.d/mandos-client.c
258
 
        $(CC) $(filter-out -fsanitize=leak,$(CFLAGS)) $(strip\
259
 
        ) $(GNUTLS_CFLAGS) $(AVAHI_CFLAGS) $(GPGME_CFLAGS) $(strip\
260
 
                ) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $^ $(strip\
261
 
                ) -lrt $(GNUTLS_LIBS) $(AVAHI_LIBS) $(strip\
 
239
        $(LINK.c) $^ -lrt $(GNUTLS_LIBS) $(AVAHI_LIBS) $(strip\
262
240
                ) $(GPGME_LIBS) $(LOADLIBES) $(LDLIBS) -o $@
263
241
 
264
 
plugin-helpers/mandos-client-iprouteadddel: plugin-helpers/mandos-client-iprouteadddel.c
265
 
        $(LINK.c) $(LIBNL3_CFLAGS) $^ $(LIBNL3_LIBS) $(strip\
266
 
                ) $(LOADLIBES) $(LDLIBS) -o $@
267
 
 
268
242
.PHONY : all doc html clean distclean mostlyclean maintainer-clean \
269
243
        check run-client run-server install install-html \
270
244
        install-server install-client-nokey install-client uninstall \
284
258
        ./mandos-ctl --check
285
259
 
286
260
# Run the client with a local config and key
287
 
run-client: all keydir/seckey.txt keydir/pubkey.txt keydir/tls-privkey.pem keydir/tls-pubkey.pem
 
261
run-client: all keydir/seckey.txt keydir/pubkey.txt
288
262
        @echo "###################################################################"
289
263
        @echo "# The following error messages are harmless and can be safely     #"
290
 
        @echo "# ignored:                                                        #"
 
264
        @echo "# ignored.  The messages are caused by not running as root, but   #"
 
265
        @echo "# you should NOT run \"make run-client\" as root unless you also    #"
 
266
        @echo "# unpacked and compiled Mandos as root, which is NOT recommended. #"
291
267
        @echo "# From plugin-runner: setgid: Operation not permitted             #"
292
268
        @echo "#                     setuid: Operation not permitted             #"
293
269
        @echo "# From askpass-fifo:  mkfifo: Permission denied                   #"
294
270
        @echo "# From mandos-client:                                             #"
295
271
        @echo "#             Failed to raise privileges: Operation not permitted #"
296
272
        @echo "#             Warning: network hook \"*\" exited with status *      #"
297
 
        @echo "#                                                                 #"
298
 
        @echo "# (The messages are caused by not running as root, but you should #"
299
 
        @echo "# NOT run \"make run-client\" as root unless you also unpacked and  #"
300
 
        @echo "# compiled Mandos as root, which is also NOT recommended.)        #"
301
273
        @echo "###################################################################"
302
274
# We set GNOME_KEYRING_CONTROL to block pam_gnome_keyring
303
275
        ./plugin-runner --plugin-dir=plugins.d \
304
 
                --plugin-helper-dir=plugin-helpers \
305
276
                --config-file=plugin-runner.conf \
306
 
                --options-for=mandos-client:--seckey=keydir/seckey.txt,--pubkey=keydir/pubkey.txt,--tls-privkey=keydir/tls-privkey.pem,--tls-pubkey=keydir/tls-pubkey.pem,--network-hook-dir=network-hooks.d \
 
277
                --options-for=mandos-client:--seckey=keydir/seckey.txt,--pubkey=keydir/pubkey.txt,--network-hook-dir=network-hooks.d \
307
278
                --env-for=mandos-client:GNOME_KEYRING_CONTROL= \
308
279
                $(CLIENTARGS)
309
280
 
310
281
# Used by run-client
311
 
keydir/seckey.txt keydir/pubkey.txt keydir/tls-privkey.pem keydir/tls-pubkey.pem: mandos-keygen
 
282
keydir/seckey.txt keydir/pubkey.txt: mandos-keygen
312
283
        install --directory keydir
313
284
        ./mandos-keygen --dir keydir --force
314
285
 
321
292
confdir/mandos.conf: mandos.conf
322
293
        install --directory confdir
323
294
        install --mode=u=rw,go=r $^ $@
324
 
confdir/clients.conf: clients.conf keydir/seckey.txt keydir/tls-pubkey.pem
 
295
confdir/clients.conf: clients.conf keydir/seckey.txt
325
296
        install --directory confdir
326
297
        install --mode=u=rw $< $@
327
298
# Add a client password
344
315
        elif install --directory --mode=u=rwx $(STATEDIR); then \
345
316
                chown -- $(USER):$(GROUP) $(STATEDIR) || :; \
346
317
        fi
347
 
        if [ "$(TMPFILES)" != "$(DESTDIR)" -a -d "$(TMPFILES)" ]; then \
348
 
                install --mode=u=rw,go=r tmpfiles.d-mandos.conf \
349
 
                        $(TMPFILES)/mandos.conf; \
350
 
        fi
351
318
        install --mode=u=rwx,go=rx mandos $(PREFIX)/sbin/mandos
352
319
        install --mode=u=rwx,go=rx --target-directory=$(PREFIX)/sbin \
353
320
                mandos-ctl
385
352
install-client-nokey: all doc
386
353
        install --directory $(LIBDIR)/mandos $(CONFDIR)
387
354
        install --directory --mode=u=rwx $(KEYDIR) \
388
 
                $(LIBDIR)/mandos/plugins.d \
389
 
                $(LIBDIR)/mandos/plugin-helpers
 
355
                $(LIBDIR)/mandos/plugins.d
390
356
        if [ "$(CONFDIR)" != "$(LIBDIR)/mandos" ]; then \
391
357
                install --mode=u=rwx \
392
 
                        --directory "$(CONFDIR)/plugins.d" \
393
 
                        "$(CONFDIR)/plugin-helpers"; \
 
358
                        --directory "$(CONFDIR)/plugins.d"; \
394
359
        fi
395
360
        install --mode=u=rwx,go=rx --directory \
396
361
                "$(CONFDIR)/network-hooks.d"
397
362
        install --mode=u=rwx,go=rx \
398
363
                --target-directory=$(LIBDIR)/mandos plugin-runner
399
 
        install --mode=u=rwx,go=rx \
400
 
                --target-directory=$(LIBDIR)/mandos mandos-to-cryptroot-unlock
401
364
        install --mode=u=rwx,go=rx --target-directory=$(PREFIX)/sbin \
402
365
                mandos-keygen
403
366
        install --mode=u=rwx,go=rx \
418
381
        install --mode=u=rwxs,go=rx \
419
382
                --target-directory=$(LIBDIR)/mandos/plugins.d \
420
383
                plugins.d/plymouth
421
 
        install --mode=u=rwx,go=rx \
422
 
                --target-directory=$(LIBDIR)/mandos/plugin-helpers \
423
 
                plugin-helpers/mandos-client-iprouteadddel
424
384
        install initramfs-tools-hook \
425
385
                $(INITRAMFSTOOLS)/hooks/mandos
426
 
        install --mode=u=rw,go=r initramfs-tools-conf \
427
 
                $(INITRAMFSTOOLS)/conf.d/mandos-conf
 
386
        install --mode=u=rw,go=r initramfs-tools-hook-conf \
 
387
                $(INITRAMFSTOOLS)/conf-hooks.d/mandos
428
388
        install initramfs-tools-script \
429
389
                $(INITRAMFSTOOLS)/scripts/init-premount/mandos
430
 
        install initramfs-tools-script-stop \
431
 
                $(INITRAMFSTOOLS)/scripts/local-premount/mandos
432
390
        install --mode=u=rw,go=r plugin-runner.conf $(CONFDIR)
433
391
        gzip --best --to-stdout mandos-keygen.8 \
434
392
                > $(MANDIR)/man8/mandos-keygen.8.gz
508
466
        -rmdir $(CONFDIR)
509
467
 
510
468
purge-client: uninstall-client
511
 
        -shred --remove $(KEYDIR)/seckey.txt $(KEYDIR)/tls-privkey.pem
 
469
        -shred --remove $(KEYDIR)/seckey.txt
512
470
        -rm --force $(CONFDIR)/plugin-runner.conf \
513
 
                $(KEYDIR)/pubkey.txt $(KEYDIR)/seckey.txt \
514
 
                $(KEYDIR)/tls-pubkey.txt $(KEYDIR)/tls-privkey.txt
 
471
                $(KEYDIR)/pubkey.txt $(KEYDIR)/seckey.txt
515
472
        -rmdir $(KEYDIR) $(CONFDIR)/plugins.d $(CONFDIR)