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diff --git a/COPYRIGHT b/COPYRIGHT new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/COPYRIGHT @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. 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If not, see <http://www.gnu.org/licenses/>. + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + <program> Copyright (C) <year> <name of author> + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +<http://www.gnu.org/licenses/>. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +<http://www.gnu.org/philosophy/why-not-lgpl.html>. diff --git a/post-install-msg.sh b/post-install-msg.sh new file mode 100755 index 0000000..8c5d5d7 --- /dev/null +++ b/post-install-msg.sh @@ -0,0 +1,60 @@ +#! /bin/sh +# +# Tell the user that the machine is ready to slurp the key for full disk +# encryption. +# +# Copyright 2013 Guilhem Moulin <guilhem@fripost.org> +# +# Licensed under the GNU GPL version 3 or higher. + +set -ue + +cd /target/etc/ + +chroot /target/ service ssh start; sleep 1 +sed -i 's/^DenyUsers \*$/AllowGroups ssh/' ./ssh/sshd_config + +# Busybox's sed doesn't support address '0,/../' +user="$(sed -rn 's/^([^:]*):[^:]*:1000:.*/\1/p' ./passwd)" +home="/target/$(sed -rn 's/^[^:]*:[^:]*:1000:[^:]*:[^:]*:([^:]*):.*/\1/p' ./passwd)" + +. /usr/share/debconf/confmodule + +ipv4="$(ip addr show eth0 | sed -nr 's/^\s+inet\s([0-9.]{4,32}).*/\1/p')" +template=$(mktemp) + +cat > "$template" <<EOF +Template: post-install/title +Type: text +Description: Installation complete + +Template: post-install/text +Type: text +Description: Press 'continue' to reboot + After the reboot, you will be able to log in to this new Debian GNU/Linux + system: + . + ssh -p 22 -l $user $ipv4 + . + To defeat MiTM-attacks, please ensure that the server fingerprint matches + . + $(ssh-keygen -lf ./ssh/ssh_host_rsa_key) + . + Key(s) that are currently granted access have the following fingerprint: + . +EOF +while read pk; do + # ssh-keygen can't read from STDIN, and ash doesn't have the '<<<' + # construct, so we save each pubkey in a temporary file + pkf=$(mktemp) + echo "$pk" > "$pkf" + echo " - $(ssh-keygen -lf $pkf)" >> "$template" + rm "$pkf" +done < "$home/.ssh/authorized_keys" +# TODO: key granted access to the initramfs +# TODO: copy the previous keys? + +debconf-loadtemplate post-install "$template" +db_settitle post-install/title +db_input critical post-install/text +db_go diff --git a/post-install.sh b/post-install.sh new file mode 100755 index 0000000..9a99965 --- /dev/null +++ b/post-install.sh @@ -0,0 +1,128 @@ +#!/bin/sh +# +# Post-installation script +# +# Copyright 2013 Guilhem Moulin <guilhem@fripost.org> +# +# Licensed under the GNU GPL version 3 or higher. + +set -ue + +find /home/ -mindepth 1 -maxdepth 1 -type d -print0 | xargs -r0 chmod og-rwx + +user="$(sed -rn '0,/^([^:]*):[^:]*:1000:.*/s//\1/p' /etc/passwd)" +home="$(sed -rn '0,/^[^:]*:[^:]*:1000:[^:]*:[^:]*:([^:]*):.*/s//\1/p' /etc/passwd)" + +test -d "$home/.ssh" || mkdir -m 0700 "$home/.ssh" +# TODO: make something more generic +cat > "$home/.ssh/authorized_keys" << EOF +ssh-rsa ... +EOF +chown -R "$user:$user" "$home/.ssh" +chmod -R og-rwx "$home/.ssh" + +# Delete the automatically generated keys, and replace by our own +rm /etc/ssh/ssh_host_*_key /etc/ssh/ssh_host_*_key.pub +ssh-keygen -b 4096 -t rsa -N '' -C /etc/ssh/ssh_host_rsa_key -f /etc/ssh/ssh_host_rsa_key + +cat > /etc/ssh/sshd_config << EOF +# What ports, IPs and protocols we listen for +Port 22 +# Use these options to restrict which interfaces/protocols sshd will bind to +#ListenAddress :: +#ListenAddress 0.0.0.0 +Protocol 2 +# HostKeys for protocol version 2 +HostKey /etc/ssh/ssh_host_rsa_key +#Privilege Separation is turned on for security +UsePrivilegeSeparation yes + +# Lifetime and size of ephemeral version 1 server key +KeyRegenerationInterval 3600 +ServerKeyBits 768 + +# Logging +SyslogFacility AUTH +LogLevel INFO + +# Authentication: +LoginGraceTime 120 +PermitRootLogin no +DenyUsers * +StrictModes yes + +RSAAuthentication yes +PubkeyAuthentication yes +#AuthorizedKeysFile %h/.ssh/authorized_keys + +# Don't read the user's ~/.rhosts and ~/.shosts files +IgnoreRhosts yes +# For this to work you will also need host keys in /etc/ssh_known_hosts +RhostsRSAAuthentication no +# similar for protocol version 2 +HostbasedAuthentication no +# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication +#IgnoreUserKnownHosts yes + +# To enable empty passwords, change to yes (NOT RECOMMENDED) +PermitEmptyPasswords no + +# Change to yes to enable challenge-response passwords (beware issues with +# some PAM modules and threads) +ChallengeResponseAuthentication no + +# Change to no to disable tunnelled clear text passwords +PasswordAuthentication no + +# Kerberos options +#KerberosAuthentication no +#KerberosGetAFSToken no +#KerberosOrLocalPasswd yes +#KerberosTicketCleanup yes + +# GSSAPI options +#GSSAPIAuthentication no +#GSSAPICleanupCredentials yes + +X11Forwarding no +X11DisplayOffset 10 +PrintMotd no +PrintLastLog yes +TCPKeepAlive yes +#UseLogin no + +#MaxStartups 10:30:60 +#Banner /etc/issue.net + +# Allow client to pass locale environment variables +AcceptEnv LANG LC_* + +Subsystem sftp /usr/lib/openssh/sftp-server + +# Set this to 'yes' to enable PAM authentication, account processing, +# and session processing. If this is enabled, PAM authentication will +# be allowed through the ChallengeResponseAuthentication and +# PasswordAuthentication. Depending on your PAM configuration, +# PAM authentication via ChallengeResponseAuthentication may bypass +# the setting of "PermitRootLogin without-password". +# If you just want the PAM account and session checks to run without +# PAM authentication, then enable this but set PasswordAuthentication +# and ChallengeResponseAuthentication to 'no'. +UsePAM no +EOF + +# TODO: the full list hangs +#apt-get autoremove --purge \ +# dictionaries-common \ +# eject \ +# ispell \ +# laptop-detect \ +# nano \ +# tasksel \ +# wamerican \ +# wbritish \ +#|| true + +sudo update-alternatives --set editor /usr/bin/vim.nox + +# TODO: initramfs diff --git a/pre-partman.sh b/pre-partman.sh new file mode 100755 index 0000000..dd3cde9 --- /dev/null +++ b/pre-partman.sh @@ -0,0 +1,68 @@ +#!/bin/sh +# +# Set up a SSH daemon, the sole purpose of which is to slurp the key for +# full disk encryption, so that it doesn't have to be manually entered +# to the installer. +# +# Copyright 2013 Guilhem Moulin <guilhem@fripost.org> +# +# Licensed under the GNU GPL version 3 or higher. + +set -ue + +# Crypto, disk and network modules, required to unlock the system from our initramfs +# TODO: should probably be stored in debconf, since we'll need the +# modules in the target only +while read k rest; do /sbin/modinfo -F filename "$k"; done < /proc/modules \ +| sed -nr "s@^/lib/modules/`uname -r`/kernel/(arch|drivers/(ata|scsi))(/.*)?/([^/]+)\.ko\$@\4@p" \ +> /tmp/initramfs-modules + +anna-install cryptsetup-udeb openssh-server-udeb +mkdir -pm0755 /etc/ssh/ +ssh-keygen -b 4096 -t rsa -N '' -C /etc/ssh/ssh_host_rsa_key -f /etc/ssh/ssh_host_rsa_key + +cat > /etc/ssh/sshd_config << EOF +Port 22 +Protocol 2 +HostKey /etc/ssh/ssh_host_rsa_key +UsePrivilegeSeparation no + +PasswordAuthentication no +ChallengeResponseAuthentication no +HostbasedAuthentication no +PubkeyAuthentication yes + +PermitRootLogin yes +AllowUsers root +StrictModes yes + +ForceCommand /cdrom/preseed/slurpkey.sh +EOF + +# Populate the authorized keys. TODO: make something more generic +test -d ~root/.ssh || mkdir -m 0700 ~root/.ssh +cat > ~root/.ssh/authorized_keys << EOF +no-agent-forwarding,no-port-forwarding,no-pty,no-user-rc,no-X11-forwarding ssh-rsa ... +EOF +chmod og-rwx ~root/.ssh/authorized_keys + +# Start the SSH daemon +touch /var/log/lastlog +/usr/sbin/sshd + +# Tell the user we're ready +/cdrom/preseed/slurpkey-msg.sh +kill `cat /var/run/sshd.pid` || true + +# Encrypt + +## fill the disk with random crap +## partition the disk +## format /boot to ext2 +## gptsync +## seed sshd and authorized_keys, print the key, forcecommand: dump everything into /lib/cryptsetup/passfifo +# /sbin/cryptsetup --verbose --align-payload 12544 --cipher aes-xts-plain64 --key-size 512 --hash sha512 --iter-time 5000 --use-random luksFormat /dev/sdb3 +# /sbin/cryptsetup luksOpen … +# pvcreate, vgcreate + +rm ~root/root.key diff --git a/slurpkey-msg.sh b/slurpkey-msg.sh new file mode 100755 index 0000000..800e1e2 --- /dev/null +++ b/slurpkey-msg.sh @@ -0,0 +1,58 @@ +#! /bin/sh +# +# Tell the user that the machine is ready to slurp the key for full disk +# encryption. +# +# Copyright 2013 Guilhem Moulin <guilhem@fripost.org> +# +# Licensed under the GNU GPL version 3 or higher. + +set -ue + +. /usr/share/debconf/confmodule + +ipv4="$(ip addr show eth0 | sed -nr 's/^\s+inet\s([0-9.]{4,32}).*/\1/p')" +template=$(mktemp) + +cat > "$template" <<EOF +Template: ssh-cryptsetup/title +Type: text +Description: Waiting for passphrase + +Template: ssh-cryptsetup/text +Type: text +Description: Press 'continue' once you have sent the key + You now need to send the encryption key for LUKS/dm-crypt to + this special-purpose SSH server: + . + ssh -T -p 22 -l root $ipv4 < /path/to/key + . + To defeat MiTM-attacks, please ensure that the server fingerprint matches + . + $(ssh-keygen -lf /etc/ssh/ssh_host_rsa_key) + . + Key(s) that are granted access have the following fingerprint: + . +EOF +while read pk; do + # ssh-keygen can't read from STDIN, and ash doesn't have the '<<<' + # construct, so we save each pubkey in a temporary file + pkf=$(mktemp) + echo "$pk" > "$pkf" + echo " - $(ssh-keygen -lf $pkf)" >> "$template" + rm "$pkf" +done < ~root/.ssh/authorized_keys +cat >> $template <<EOF + . + Note: This server is ephemeral, and will be replaced with a full-blown + one toward the end of the installation. +EOF + +debconf-loadtemplate ssh-cryptsetup "$template" +# Anything sent to the SSH is stored into ~root/root.key, which is our +# LUKS key. +until test -r ~root/root.key; do + db_settitle ssh-cryptsetup/title + db_input critical ssh-cryptsetup/text + db_go +done diff --git a/slurpkey.sh b/slurpkey.sh new file mode 100755 index 0000000..c047dd4 --- /dev/null +++ b/slurpkey.sh @@ -0,0 +1,4 @@ +#!/bin/sh + +umask 0077 +cat > ~root/root.key |