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  • Committer: Teddy Hogeborn
  • Date: 2015-03-10 18:52:09 UTC
  • Revision ID: teddy@recompile.se-20150310185209-lxuovbu09zwyk9bx
Automatically determine the number of DH bits in the TLS handshake.

Instead of using a default value of 1024, check the OpenPGP key and
determine an appropriate number of DH bits to use, (using GnuTLS
functions made for this).  Document this new default behavior.

* plugins.d/mandos-client.c (safe_string): New function.
  (init_gnutls_global): If not specified, determine the number of DH
                        bits to use, based on the OpenPGP key.
* plugins.d/mandos-client.xml (OPTIONS): Document this new default of
                                         the --dh-bits option.

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

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Lines of Context:
INSTALL
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** Operating System
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   Debian 8.0 "jessie" or Ubuntu 15.10 "Wily Werewolf" (or later).
 
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   Debian 6.0 "squeeze" or Ubuntu 10.10 "Maverick Meerkat" (or later).
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   This is mostly for the support scripts which make sure that the
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   client is installed and started in the initial RAM disk environment
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    "man -l mandos.8".
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*** Mandos Server
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    + GnuTLS 3.3          https://www.gnutls.org/
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      (but not 3.6.0 or later, until 3.6.6, which works)
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    + Avahi 0.6.16        https://www.avahi.org/
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    + Python 3           https://www.python.org/
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      Note: Python 2.7 is still supported, if the "mandos",
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      "mandos-ctl", and "mandos-monitor" files are edited to contain
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      "#!/usr/bin/python" instead of python3.
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    + dbus-python 0.82.4 https://dbus.freedesktop.org/doc/dbus-python/
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    + PyGObject 3.8      https://wiki.gnome.org/Projects/PyGObject
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    + pkg-config https://www.freedesktop.org/wiki/Software/pkg-config/
 
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    + GnuTLS 2.4          http://www.gnutls.org/
 
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      Note: GnuTLS 3 will only work with Python-GnuTLS 2
 
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    + Avahi 0.6.16        http://www.avahi.org/
 
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    + Python 2.7          https://www.python.org/
 
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    + Python-GnuTLS 1.1.5 https://pypi.python.org/pypi/python-gnutls/
 
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    + dbus-python 0.82.4  http://dbus.freedesktop.org/doc/dbus-python/
 
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    + PyGObject 2.14.2    https://developer.gnome.org/pygobject/
 
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    + pkg-config  http://www.freedesktop.org/wiki/Software/pkg-config/
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    + Urwid 1.0.1         http://urwid.org/
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      (Only needed by the "mandos-monitor" tool.)
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    + ssh-keyscan from OpenSSH http://www.openssh.com/
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    Package names:
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    avahi-daemon python3 python3-dbus python3-gi python3-urwid
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    pkg-config fping ssh-client
 
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    python-gnutls avahi-daemon python python-avahi python-dbus
 
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    python-gobject python-urwid pkg-config fping ssh-client
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*** Mandos Client
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    + GNU C Library 2.17 https://gnu.org/software/libc/
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    + GnuTLS 3.3        https://www.gnutls.org/
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      (but not 3.6.0 or later, until 3.6.6 which works)
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    + Avahi 0.6.16      https://www.avahi.org/
 
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    + initramfs-tools 0.85i
 
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                        https://tracker.debian.org/pkg/initramfs-tools
 
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    + GnuTLS 2.4        http://www.gnutls.org/
 
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    + Avahi 0.6.16      http://www.avahi.org/
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    + GnuPG 1.4.9       https://www.gnupg.org/
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    + GPGME 1.1.6       https://www.gnupg.org/related_software/gpgme/
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    + pkg-config https://www.freedesktop.org/wiki/Software/pkg-config/
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    + libnl-route 3     https://www.infradead.org/~tgr/libnl/
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    + GLib 2.40         http://www.gtk.org/
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    One of:
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    + initramfs-tools 0.85i
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                        https://tracker.debian.org/pkg/initramfs-tools
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    + dracut 044+241
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         http://www.kernel.org/pub/linux/utils/boot/dracut/dracut.html
 
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    + pkg-config  http://www.freedesktop.org/wiki/Software/pkg-config/
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    Strongly recommended:
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    + OpenSSH           http://www.openssh.com/
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    Package names:
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    initramfs-tools dracut libgnutls-dev gnutls-bin libavahi-core-dev
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    gnupg libgpgme11-dev pkg-config ssh libnl-route-3-dev
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    libglib2.0-dev
 
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    initramfs-tools libgnutls-dev libavahi-core-dev gnupg
 
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    libgpgme11-dev pkg-config ssh
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* Installing the Mandos server
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        # /usr/lib/mandos/plugins.d/mandos-client \
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                --pubkey=/etc/keys/mandos/pubkey.txt \
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                --seckey=/etc/keys/mandos/seckey.txt \
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                --tls-privkey=/etc/keys/mandos/tls-privkey.pem \
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                --tls-pubkey=/etc/keys/mandos/tls-pubkey.pem; echo
 
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                --seckey=/etc/keys/mandos/seckey.txt; echo
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     This command should retrieve the password from the server,
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     decrypt it, and output it to standard output.