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  • Committer: Teddy Hogeborn
  • Date: 2015-07-09 20:32:52 UTC
  • mto: (237.7.594 trunk)
  • mto: This revision was merged to the branch mainline in revision 325.
  • Revision ID: teddy@recompile.se-20150709203252-u10p7trfsxc1a9yp
Install client Diffie-Hellman parameters into initramfs.

* debian/control (Package: mandos-client/Recommends): Added
  "gnutls-bin | openssl" (to generate DH parameters).
* debian/mandos-client.postinst (create_dh_params): New function
                                                    called on package
                                                    configure.
* plugins.d/mandos-client.c (main): Bug fix: Work around Debian bug
                                    #633582 also for the
                                    "client-dhparams.pem" file.

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#!/bin/bash -e
 
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#!/bin/sh
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# This script can be called in the following ways:
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#
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# After the package was installed:
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# If prerm fails during replacement due to conflict:
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#       <postinst> abort-remove in-favour <new-package> <version>
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. /usr/share/debconf/confmodule
 
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set -e
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# Update the initial RAM file system image
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update_initramfs()
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    if [ -x /usr/sbin/update-initramfs ]; then
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        update-initramfs -u -k all
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    fi
 
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    if dpkg --compare-versions "$2" lt-nl "1.0.10-1"; then
 
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        # Make old initrd.img files unreadable too, in case they were
 
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        # created with mandos-client 1.0.8 or older.
 
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        find /boot -maxdepth 1 -type f -name "initrd.img-*.bak" \
 
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            -print0 | xargs --null --no-run-if-empty chmod o-r
 
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    fi
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}
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# Add user and group
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add_mandos_user(){
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    # Rename old "mandos" user and group
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    case "$(getent passwd mandos)" in
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        *:Mandos\ password\ system,,,:/nonexistent:/bin/false)
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            usermod --login _mandos mandos
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            groupmod --new-name _mandos mandos
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            return
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            ;;
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    esac
 
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    if dpkg --compare-versions "$2" lt "1.0.3-1"; then
 
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        case "`getent passwd mandos`" in
 
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            *:Mandos\ password\ system,,,:/nonexistent:/bin/false)
 
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                usermod --login _mandos mandos
 
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                groupmod --new-name _mandos mandos
 
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                return
 
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                ;;
 
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        esac
 
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    fi
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    # Create new user and group
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    if ! getent passwd _mandos >/dev/null; then
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        adduser --system --force-badname --quiet --home /nonexistent \
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    fi
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}
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create_dh_params(){
 
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    if [ -r /etc/keys/mandos/client-dhparams.pem ]; then
 
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        return 0
 
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    fi
 
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    # Create a Diffe-Hellman parameters file
 
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    DHFILE="`mktemp -t mandos-client-dh-parameters.XXXXXXXXXX.pem`"
 
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    # First try certtool from GnuTLS
 
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    if ! certtool --generate-dh-params --sec-param high \
 
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         --outfile "$DHFILE"; then
 
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        # Otherwise try OpenSSL
 
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        if ! openssl genpkey -genparam -algorithm DH -out "$DHFILE" \
 
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             -pkeyopt dh_paramgen_prime_len:3072; then
 
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            # None of the commands succeded; give up
 
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            rm -- "$DHFILE"
 
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            return 1
 
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        fi
 
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    fi
 
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    sed --in-place --expression='0,/^-----BEGIN DH PARAMETERS-----$/d' \
 
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        "$DHFILE"
 
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    sed --in-place --expression='1i-----BEGIN DH PARAMETERS-----' \
 
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            "$DHFILE"
 
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    cp --archive "$DHFILE" /etc/keys/mandos/client-dhparams.pem
 
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    rm -- "$DHFILE"
 
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}
 
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case "$1" in
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    configure)
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        add_mandos_user
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        create_key
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        update_initramfs
 
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        add_mandos_user "$@"
 
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        create_key "$@"
 
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        create_dh_params "$@" || :
 
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        update_initramfs "$@"
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        ;;
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    abort-upgrade|abort-deconfigure|abort-remove)
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        ;;
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    *)
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        echo "$0 called with unknown argument \`$1'" 1>&2
 
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        echo "$0 called with unknown argument '$1'" 1>&2
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        exit 1
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        ;;
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esac