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  • Committer: Teddy Hogeborn
  • Date: 2019-02-09 23:23:26 UTC
  • Revision ID: teddy@recompile.se-20190209232326-z1z2kzpgfixz7iaj
Add support for using raw public keys in TLS (RFC 7250)

Since GnuTLS removed support for OpenPGP keys in TLS (RFC 6091), and
no other library supports it, we have to change the protocol to use
something else.  We choose to use "raw public keys" (RFC 7250).  Since
we still use OpenPGP keys to decrypt the secret password, this means
that each client will have two keys: One OpenPGP key and one TLS
public/private key, and the key ID of the latter key is used to
identify clients instead of the fingerprint of the OpenPGP key.

Note that this code is still compatible with GnuTLS before version
3.6.0 (when OpenPGP key support was removed).  This commit merely adds
support for using raw pulic keys instead with GnuTLS 3.6.6. or later.

* DBUS-API (Signals/ClientNotFound): Change name of first parameter
                                     from "Fingerprint" to "KeyID".
  (Mandos Client Interface/Properties/KeyID): New.
* INSTALL: Document conflict with GnuTLS 3.6.0 (which removed OpenPGP
           key support) up until 3.6.6, when support for raw public
           keys was added.  Also document new dependency of client on
           "gnutls-bin" package (for certtool).
* Makefile (run-client): Depend on TLS key files, and also pass them
                         as arguments to client.
  (keydir/tls-privkey.pem, keydir/tls-pubkey.pem): New.
  (confdir/clients.conf): Add dependency on TLS public key.
  (purge-client): Add removal of TLS key files.
* clients.conf ([foo]/key_id, [bar]/key_id): New.
* debian/control (Source: mandos/Build-Depends): Also allow
                                                 libgnutls30 (>= 3.6.6)
  (Package: mandos/Depends): - '' -
  (Package: mandos/Description): Alter description to match new
                                 design.
  (Package: mandos-client/Description): - '' -
  (Package: mandos-client/Depends): Move "gnutls-bin | openssl" to
                                    here from "Recommends".
* debian/mandos-client.README.Debian: Add --tls-privkey and
                                      --tls-pubkey options to test
                                      command.
* debian/mandos-client.postinst (create_key): Renamed to "create_keys"
                                             (all callers changed),
                                             and also create TLS key.
* debian/mandos-client.postrm (purge): Also remove TLS key files.
* intro.xml (DESCRIPTION): Describe new dual-key design.
* mandos (GnuTLS): Define different functions depending on whether
                   support for raw public keys is detected.
  (Client.key_id): New attribute.
  (ClientDBus.KeyID_dbus_property): New method.
  (ProxyClient.__init__): Take new "key_id" parameter.
  (ClientHandler.handle): Use key IDs when using raw public keys and
                          use fingerprints when using OpenPGP keys.
  (ClientHandler.peer_certificate): Also handle raw public keys.
  (ClientHandler.key_id): New.
  (MandosServer.handle_ipc): Pass key ID over the pipe IPC.  Also
                             check for key ID matches when looking up
                             clients.
  (main): Default GnuTLS priority string depends on whether we are
          using raw public keys or not.  When unpickling clients, set
          key_id if not set in the pickle.
  (main/MandosDBusService.ClientNotFound): Change name of first
                                           parameter from
                                           "Fingerprint" to "KeyID".
* mandos-clients.conf.xml (OPTIONS): Document new "key_id" option.
  (OPTIONS/secret): Mention new key ID matchning.
  (EXPANSION/RUNTIME EXPANSION): Add new "key_id" option.
  (EXAMPLE): - '' -
* mandos-ctl (tablewords, main/keywords): Add new "KeyID" property.
* mandos-keygen: Create TLS key files.  New "--tls-keytype" (-T)
                 option.  Alter help text to be more clear about key
                 types.  When in password mode, also output "key_id"
                 option.
* mandos-keygen.xml (SYNOPSIS): Add new "--tls-keytype" (-T) option.
  (DESCRIPTION): Alter to match new dual-key design.
  (OVERVIEW): - '' -
  (FILES): Add TLS key files.
* mandos-options.xml (priority): Document new default priority string
                                 when using raw public keys.
* mandos.xml (NETWORK PROTOCOL): Describe new protocol using key ID.
  (BUGS): Remove issue about checking expire times of OpenPGP keys,
          since TLS public keys do not have expiration times.
  (SECURITY/CLIENT): Alter description to match new design.
  (SEE ALSO/GnuTLS): - '' -
  (SEE ALSO): Add reference to RFC 7250, and alter description of when
              RFC 6091 is used.
* overview.xml: Alter text to match new design.
* plugin-runner.xml (EXAMPLE): Add --tls-pubkey and --tls-privkey
                               options to mandos-client options.
* plugins.d/mandos-client.c: Use raw public keys when compiling with
                             supporting GnuTLS versions. Add new
                             "--tls-pubkey" and "--tls-privkey"
                             options (which do nothing if GnuTLS
                             library does not support raw public
                             keys).  Alter text throughout to reflect
                             new design.  Only generate new DH
                             parameters (based on size of OpenPGP key)
                             when using OpenPGP in TLS.  Default
                             GnuTLS priority string depends on whether
                             we are using raw public keys or not.
* plugins.d/mandos-client.xml (SYNOPSIS): Add new "--tls-privkey" (-t)
                                          and "--tls-pubkey" (-T)
                                          options.
  (DESCRIPTION): Describe new dual-key design.
  (OPTIONS): Document new "--tls-privkey" (-t) and "--tls-pubkey" (-T)
             options.
  (OPTIONS/--dh-bits): No longer necessarily depends on OpenPGP key
                       size.
  (FILES): Add default locations for TLS public and private key files.
  (EXAMPLE): Use new --tls-pubkey and --tls-privkey options.
  (SECURITY): Alter wording slightly to reflect new dual-key design.
  (SEE ALSO/GnuTLS): Alter description to match new design.
  (SEE ALSO): Add reference to RFC 7250, and alter description of when
              RFC 6091 is used.

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Lines of Context:
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 \
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        -Wunused -Wuninitialized -Wstrict-overflow=5 \
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        -Wsuggest-attribute=pure -Wsuggest-attribute=const \
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        -Wmissing-format-attribute -Wnormalized=nfc -Wpacked \
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        -Wredundant-decls -Wnested-externs -Winline -Wvla \
12
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        -Wvolatile-register-var -Woverlength-strings
13
 
#DEBUG=-ggdb3
 
13
#DEBUG:=-ggdb3 -fsanitize=address 
14
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# For info about _FORTIFY_SOURCE, see feature_test_macros(7)
15
 
# and <http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html>.
16
 
FORTIFY=-D_FORTIFY_SOURCE=2 -fstack-protector-all -fPIC
 
15
# and <https://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html>.
 
16
FORTIFY:=-D_FORTIFY_SOURCE=2 -fstack-protector-all -fPIC
17
17
# <https://developerblog.redhat.com/2014/10/16/gcc-undefined-behavior-sanitizer-ubsan/>
18
 
ALL_SANITIZE_OPTIONS:=-fsanitize=address -fsanitize=undefined \
 
18
ALL_SANITIZE_OPTIONS:=-fsanitize=leak -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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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)))
31
 
LINK_FORTIFY_LD=-z relro -z now
32
 
LINK_FORTIFY=
 
31
LINK_FORTIFY_LD:=-z relro -z now
 
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LINK_FORTIFY:=
33
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# If BROKEN_PIE is set, do not build with -pie
35
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ifndef BROKEN_PIE
37
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LINK_FORTIFY += -pie
38
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endif
39
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#COVERAGE=--coverage
40
 
OPTIMIZE=-Os -fno-strict-aliasing
41
 
LANGUAGE=-std=gnu11
42
 
htmldir=man
43
 
version=1.7.6
44
 
SED=sed
 
40
OPTIMIZE:=-Os -fno-strict-aliasing
 
41
LANGUAGE:=-std=gnu11
 
42
htmldir:=man
 
43
version:=1.7.20
 
44
SED:=sed
45
45
 
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)))
 
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)))
48
48
 
49
49
## 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
 
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
57
57
##
58
58
 
59
59
## 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 \
 
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 \
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67
        for d in \
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        "/usr/lib/`dpkg-architecture -qDEB_HOST_MULTIARCH 2>/dev/null`" \
69
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        "`rpm --eval='%{_libdir}' 2>/dev/null`" /usr/lib; do \
74
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        done)
75
75
##
76
76
 
77
 
SYSTEMD=$(DESTDIR)$(shell pkg-config systemd --variable=systemdsystemunitdir)
78
 
TMPFILES=$(DESTDIR)$(shell pkg-config systemd --variable=tmpfilesdir)
 
77
SYSTEMD:=$(DESTDIR)$(shell pkg-config systemd --variable=systemdsystemunitdir)
 
78
TMPFILES:=$(DESTDIR)$(shell pkg-config systemd --variable=tmpfilesdir)
79
79
 
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; \
 
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; \
86
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        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)
 
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
89
 
90
90
# Do not change these two
91
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CFLAGS+=$(WARN) $(DEBUG) $(FORTIFY) $(SANITIZE) $(COVERAGE) \
92
 
        $(OPTIMIZE) $(LANGUAGE) $(GNUTLS_CFLAGS) $(AVAHI_CFLAGS) \
93
 
        $(GPGME_CFLAGS) -DVERSION='"$(version)"'
 
92
        $(OPTIMIZE) $(LANGUAGE) -DVERSION='"$(version)"'
94
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LDFLAGS+=-Xlinker --as-needed $(COVERAGE) $(LINK_FORTIFY) $(foreach flag,$(LINK_FORTIFY_LD),-Xlinker $(flag))
95
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96
95
# Commands to format a DocBook <refentry> document into a manual page
117
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        /usr/share/xml/docbook/stylesheet/nwalsh/xhtml/docbook.xsl \
118
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        $<; $(HTMLPOST) $@)
119
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# Fix citerefentry links
120
 
HTMLPOST=$(SED) --in-place \
 
119
HTMLPOST:=$(SED) --in-place \
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        --expression='s/\(<a class="citerefentry" href="\)\("><span class="citerefentry"><span class="refentrytitle">\)\([^<]*\)\(<\/span>(\)\([^)]*\)\()<\/span><\/a>\)/\1\3.\5\2\3\4\5\6/g'
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123
 
PLUGINS=plugins.d/password-prompt plugins.d/mandos-client \
 
122
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
126
 
PLUGIN_HELPERS=plugin-helpers/mandos-client-iprouteadddel
127
 
CPROGS=plugin-runner $(PLUGINS) $(PLUGIN_HELPERS)
128
 
PROGS=mandos mandos-keygen mandos-ctl mandos-monitor $(CPROGS)
129
 
DOCS=mandos.8 mandos-keygen.8 mandos-monitor.8 mandos-ctl.8 \
 
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 \
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        mandos.conf.5 mandos-clients.conf.5 plugin-runner.8mandos \
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        plugins.d/mandos-client.8mandos \
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        plugins.d/password-prompt.8mandos plugins.d/usplash.8mandos \
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        plugins.d/splashy.8mandos plugins.d/askpass-fifo.8mandos \
134
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        plugins.d/plymouth.8mandos intro.8mandos
135
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136
 
htmldocs=$(addsuffix .xhtml,$(DOCS))
 
135
htmldocs:=$(addsuffix .xhtml,$(DOCS))
137
136
 
138
 
objects=$(addsuffix .o,$(CPROGS))
 
137
objects:=$(addsuffix .o,$(CPROGS))
139
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140
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all: $(PROGS) mandos.lsm
141
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                --expression='s/\(mandos_\)[0-9.]\+\(\.orig\.tar\.gz\)/\1$(version)\2/' \
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                $@)
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255
# Need to add the GnuTLS, Avahi and GPGME libraries, and can't use
 
256
# -fsanitize=leak because GnuTLS and GPGME both leak memory.
256
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plugins.d/mandos-client: plugins.d/mandos-client.c
257
 
        $(LINK.c) $^ -lrt $(GNUTLS_LIBS) $(AVAHI_LIBS) $(strip\
 
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\
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                ) $(GPGME_LIBS) $(LOADLIBES) $(LDLIBS) -o $@
259
263
 
260
264
plugin-helpers/mandos-client-iprouteadddel: plugin-helpers/mandos-client-iprouteadddel.c
280
284
        ./mandos-ctl --check
281
285
 
282
286
# Run the client with a local config and key
283
 
run-client: all keydir/seckey.txt keydir/pubkey.txt
 
287
run-client: all keydir/seckey.txt keydir/pubkey.txt keydir/tls-privkey.pem keydir/tls-pubkey.pem
284
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        @echo "###################################################################"
285
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        @echo "# The following error messages are harmless and can be safely     #"
286
 
        @echo "# ignored.  The messages are caused by not running as root, but   #"
287
 
        @echo "# you should NOT run \"make run-client\" as root unless you also    #"
288
 
        @echo "# unpacked and compiled Mandos as root, which is NOT recommended. #"
 
290
        @echo "# ignored:                                                        #"
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        @echo "# From plugin-runner: setgid: Operation not permitted             #"
290
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        @echo "#                     setuid: Operation not permitted             #"
291
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        @echo "# From askpass-fifo:  mkfifo: Permission denied                   #"
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        @echo "# From mandos-client:                                             #"
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        @echo "#             Failed to raise privileges: Operation not permitted #"
294
296
        @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.)        #"
295
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        @echo "###################################################################"
296
302
# We set GNOME_KEYRING_CONTROL to block pam_gnome_keyring
297
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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 \
300
 
                --options-for=mandos-client:--seckey=keydir/seckey.txt,--pubkey=keydir/pubkey.txt,--network-hook-dir=network-hooks.d \
 
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 \
301
307
                --env-for=mandos-client:GNOME_KEYRING_CONTROL= \
302
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                $(CLIENTARGS)
303
309
 
304
310
# Used by run-client
305
 
keydir/seckey.txt keydir/pubkey.txt: mandos-keygen
 
311
keydir/seckey.txt keydir/pubkey.txt keydir/tls-privkey.pem keydir/tls-pubkey.pem: mandos-keygen
306
312
        install --directory keydir
307
313
        ./mandos-keygen --dir keydir --force
308
314
 
315
321
confdir/mandos.conf: mandos.conf
316
322
        install --directory confdir
317
323
        install --mode=u=rw,go=r $^ $@
318
 
confdir/clients.conf: clients.conf keydir/seckey.txt
 
324
confdir/clients.conf: clients.conf keydir/seckey.txt keydir/tls-pubkey.pem
319
325
        install --directory confdir
320
326
        install --mode=u=rw $< $@
321
327
# Add a client password
339
345
                chown -- $(USER):$(GROUP) $(STATEDIR) || :; \
340
346
        fi
341
347
        if [ "$(TMPFILES)" != "$(DESTDIR)" -a -d "$(TMPFILES)" ]; then \
342
 
                install --mode=u=rwx,go=r tmpfiles.d-mandos.conf \
 
348
                install --mode=u=rw,go=r tmpfiles.d-mandos.conf \
343
349
                        $(TMPFILES)/mandos.conf; \
344
350
        fi
345
351
        install --mode=u=rwx,go=rx mandos $(PREFIX)/sbin/mandos
390
396
                "$(CONFDIR)/network-hooks.d"
391
397
        install --mode=u=rwx,go=rx \
392
398
                --target-directory=$(LIBDIR)/mandos plugin-runner
 
399
        install --mode=u=rwx,go=rx \
 
400
                --target-directory=$(LIBDIR)/mandos mandos-to-cryptroot-unlock
393
401
        install --mode=u=rwx,go=rx --target-directory=$(PREFIX)/sbin \
394
402
                mandos-keygen
395
403
        install --mode=u=rwx,go=rx \
415
423
                plugin-helpers/mandos-client-iprouteadddel
416
424
        install initramfs-tools-hook \
417
425
                $(INITRAMFSTOOLS)/hooks/mandos
418
 
        install --mode=u=rw,go=r initramfs-tools-hook-conf \
419
 
                $(INITRAMFSTOOLS)/conf-hooks.d/mandos
 
426
        install --mode=u=rw,go=r initramfs-tools-conf \
 
427
                $(INITRAMFSTOOLS)/conf.d/mandos-conf
420
428
        install initramfs-tools-script \
421
429
                $(INITRAMFSTOOLS)/scripts/init-premount/mandos
 
430
        install initramfs-tools-script-stop \
 
431
                $(INITRAMFSTOOLS)/scripts/local-premount/mandos
422
432
        install --mode=u=rw,go=r plugin-runner.conf $(CONFDIR)
423
433
        gzip --best --to-stdout mandos-keygen.8 \
424
434
                > $(MANDIR)/man8/mandos-keygen.8.gz
498
508
        -rmdir $(CONFDIR)
499
509
 
500
510
purge-client: uninstall-client
501
 
        -shred --remove $(KEYDIR)/seckey.txt
 
511
        -shred --remove $(KEYDIR)/seckey.txt $(KEYDIR)/tls-privkey.pem
502
512
        -rm --force $(CONFDIR)/plugin-runner.conf \
503
 
                $(KEYDIR)/pubkey.txt $(KEYDIR)/seckey.txt
 
513
                $(KEYDIR)/pubkey.txt $(KEYDIR)/seckey.txt \
 
514
                $(KEYDIR)/tls-pubkey.txt $(KEYDIR)/tls-privkey.txt
504
515
        -rmdir $(KEYDIR) $(CONFDIR)/plugins.d $(CONFDIR)