Options to re-enable WOL and start a full shell
Adding ethtool - to allows chaning WOL settings - does not add much more dependencies compared to the core ones (network, dropbear, cryptsetup). Refactor script for easier maintenance. v1.0-1master 1.0-1
Julien Coloos
parent
a2924457d3
commit
f20941d376
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@ -1,3 +1,10 @@
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2021-11-13 Julien Coloos <julien.coloos [at] gmail [dot] com>
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* v1.0-1
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Option to use login shell instead of cryptsetup unlocking script
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Option to re-enable Wake-on-LAN on network device
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2021-11-12 Julien Coloos <julien.coloos [at] gmail [dot] com>
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* v0.9-2
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15
PKGBUILD
15
PKGBUILD
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@ -1,20 +1,21 @@
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# Maintainer: Julien Coloos <julien.coloos [at] gmail [dot] com>
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pkgname=initrd-ssh-cryptsetup
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pkgver=0.9
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pkgrel=2
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pkgdesc="Allows for LUKS-encrypted devices to be unlocked remotely over SSH"
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pkgver=1.0
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pkgrel=1
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pkgdesc="Allows to remotely unlock LUKS-encrypted devices over SSH"
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arch=('any')
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url="https://github.com/suiryc/archlinux-$pkgname"
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license=('GPL3')
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depends=('dropbear' 'cryptsetup' 'mkinitcpio-nfs-utils' 'iproute2')
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depends=('dropbear' 'cryptsetup' 'mkinitcpio-nfs-utils' 'iproute2' 'ethtool')
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install=$pkgname.install
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changelog='ChangeLog'
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source=("http://julien.coloos.free.fr/archlinux/$pkgname-$pkgver.tar.xz" "$pkgname.install")
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sha256sums=('c3fa91fc8ba2228b3492d3709231918c8015cc3da49f516c3eacea5c0217536c'
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sha256sums=('de6ef287ecfd57614835fec1fcaa01eb3a7f999d42a749e20b6747671320508f'
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'b84978b3c2ef32208c2b104ee2d3ce8aaec26da0bd4e9e1c83942f373bbf6285')
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package() {
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install -Dm644 "$srcdir/src/install/ssh-cryptsetup" "$pkgdir/usr/lib/initcpio/install/ssh-cryptsetup"
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install -Dm644 "$srcdir/src/hooks/ssh-cryptsetup" "$pkgdir/usr/lib/initcpio/hooks/ssh-cryptsetup"
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install -Dm644 "$srcdir/src/install/ssh-cryptsetup" "$pkgdir/usr/lib/initcpio/install/ssh-cryptsetup"
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install -Dm644 "$srcdir/src/hooks/ssh-cryptsetup" "$pkgdir/usr/lib/initcpio/hooks/ssh-cryptsetup"
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install -Dm644 "$srcdir/src/hooks/ssh-cryptsetup-tools" "$pkgdir/usr/lib/initcpio/hooks/ssh-cryptsetup-tools"
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}
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26
README.md
26
README.md
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@ -1,4 +1,4 @@
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Personal ArchLinux package combining dropbear and cryptsetup in initrd for unlocking LUKS-encrypted devices either locally (boot console) or remotely over SSH.
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Personal ArchLinux package combining dropbear and cryptsetup in initramfs for unlocking LUKS-encrypted devices either locally (boot console) or remotely over SSH.
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The code was reworked from legacy dropbear_initrd_encrypt AUR package.
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@ -37,33 +37,43 @@ As explained upon installation, the following things need to be done:
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The LUKS-encrypted devices to unlock are derived from `/etc/crypttab`.
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Some options can be set in `/etc/initcpio/sshcs_env` (file is sourced in initrd shell):
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Some options can be set in `/etc/initcpio/sshcs_env` (file is sourced in initramfs shell):
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* `sshcs_opt_debug`: whether to be more verbose about ongoing actions
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- default: 0
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- default: `0`
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- any non-zero value to enable
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* `sshcs_opt_net_wol`: Wake-on-LAN option to set on network device
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- default: `g` (MagicPacket™)
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- usually WOL is disabled once in initramfs shell
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- set empty to not change network device WOL setting
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* `sshcs_opt_timeout_ipconfig`: time (in seconds) to configure IP
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- default: 10 seconds
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- default: `10`
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* `sshcs_opt_listen`: SSH listening port
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- default: 22
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- default: `22`
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* `sshcs_opt_timeout_poweroff`: time (in seconds) to unlock devices before automatic powering off
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- default (and minimum value): 2 minutes
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- default (and minimum value): `120` (2 minutes)
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- negative value to deactivate
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* `sshcs_opt_use_shell`: whether to start a full `ash` shell
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- default: `0`
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- `1` to enable
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- when disabled (the default), a script to unlock devices is executed instead
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For example:
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sshcs_opt_timeout_ipconfig=30
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sshcs_opt_listen=2222
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sshcs_opt_timeout_poweroff=-1
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sshcs_opt_use_shell=1
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## Building notes
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1. Modify the sources (features in `src`, and/or package building files)
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2. If `src` was modified
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* archive the `src` folder in `$pkgname-$pkgver.tar.xz` file; e.g.: `tar -cJf initrd-ssh-cryptsetup-0.9.tar.xz src`
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* bump `pkgver` in `PKGBUILD`
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* archive the `src` folder in `$pkgname-$pkgver.tar.xz` file; e.g.: `tar -cJf initrd-ssh-cryptsetup-$(grep "^pkgver=" PKGBUILD | cut -d'=' -f2).tar.xz src`
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* upload the archive on the online repository (pointed by `PKGBUILD`)
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3. Update ChangeLog
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4. Update `PKGBUILD`
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* bump `pkgver` if `src` was modified, or `pkgrel` if building files were modified
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* bump `pkgrel` if only building files were modified
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* refresh `sha256sums` with `updpkgsums` if necessary
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- or manually, based on `sha256sum initrd-ssh-cryptsetup-*.tar.xz initrd-ssh-cryptsetup.install` output
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5. Delete generated archive file if any
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@ -1,311 +1,324 @@
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#!/usr/bin/ash
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dbg () {
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[ ${sshcs_opt_debug} != 0 ] && echo "$@"
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}
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sshcs_env_load() {
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local debug_default=0
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local timeout_ipconfig_default=10
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local timeout_poweroff_min=120
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[ -e "${sshcs_env}" ] && . "${sshcs_env}"
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[ -z "${sshcs_opt_debug}" ] && sshcs_opt_debug=${debug_default}
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[ -z "${sshcs_opt_timeout_ipconfig}" ] && sshcs_opt_timeout_ipconfig=${timeout_ipconfig_default}
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[ -n "${sshcs_opt_listen}" ] && sshcs_opt_listen="-p ${sshcs_opt_listen}"
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[ -z "${sshcs_opt_timeout_poweroff}" ] && sshcs_opt_timeout_poweroff=${timeout_poweroff_min}
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[ ${sshcs_opt_timeout_poweroff} -ge 0 ] && [ ${sshcs_opt_timeout_poweroff} -lt ${timeout_poweroff_min} ] && sshcs_opt_timeout_poweroff=${timeout_poweroff_min}
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}
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. "/usr/local/bin/ssh-cryptsetup-tools"
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sshcs_net_start() {
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# we must have an 'ip' setting, and a device in it
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[ -z "${ip}" ] && [ -n "${nfsaddrs}" ] && ip="${nfsaddrs}"
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[ -z "${ip}" ] && {
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dbg "No ip setting to setup network"
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return 1
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}
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local iparg net_address ipconfig_out net_netmask net_gateway net_dns0 net_dns1
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net_device=$(echo ${ip} | cut -d: -f6)
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[ -z "${net_device}" ] && {
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dbg "No network device to setup"
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return 1
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}
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# we must have an 'ip' setting, and a device in it
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[ -z "${ip}" ] && [ -n "${nfsaddrs}" ] && ip="${nfsaddrs}"
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[ -z "${ip}" ] && {
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dbg "No ip setting to setup network"
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return 1
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}
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# Setup network and save some values
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# Note: some useful redirection means ('< <(...)' and '<<< "$(...)"') are
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# not supported in the available shell. So we have to write code in a
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# temporary file and 'source' it since '... | while read ...' spawns a
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# subshell from which outer variables cannot be altered.
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: > "${net_env}"
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net_device=$(echo ${ip} | cut -d: -f6)
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[ -z "${net_device}" ] && {
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dbg "No network device to setup"
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return 1
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}
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echo ""
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echo "Configuring IP (timeout = ${sshcs_opt_timeout_ipconfig}s) ..."
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# ipconfig manual: https://git.kernel.org/pub/scm/libs/klibc/klibc.git/tree/usr/kinit/ipconfig/README.ipconfig
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ipconfig_out=$(ipconfig -t "${sshcs_opt_timeout_ipconfig}" "ip=${ip}")
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if [ $? -ne 0 ]; then
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err "IP configuration timeout!"
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echo "Devices probing:"
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ipconfig -n -t 5 -c none all
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return 1
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fi
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if [ "${sshcs_opt_net_wol:-d}" != "d" ]; then
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dbg "Setting network device=${net_device} wol=${sshcs_opt_net_wol}"
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ethtool -s "${net_device}" wol "${sshcs_opt_net_wol}"
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fi
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echo -n "${ipconfig_out}" | while read line; do
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[ "${line#"IP-Config:"}" != "${line}" ] && continue
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# Setup network and save some values
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# Note: some useful redirection means ('< <(...)' and '<<< "$(...)"') are
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# not supported in the available shell. So we have to write code in a
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# temporary file and 'source' it since '... | while read ...' spawns a
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# subshell from which outer variables cannot be altered.
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: > "${net_env}"
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line="$(echo "${line}" | sed -e 's/ :/:/g;s/: /=/g')"
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echo ""
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echo "Configuring IP (timeout = ${sshcs_opt_timeout_ipconfig}s) ..."
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# ipconfig manual: https://git.kernel.org/pub/scm/libs/klibc/klibc.git/tree/usr/kinit/ipconfig/README.ipconfig
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ipconfig_out=$(ipconfig -t "${sshcs_opt_timeout_ipconfig}" "ip=${ip}")
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if [ $? -ne 0 ]; then
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err "IP configuration timeout!"
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echo "Devices probing:"
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ipconfig -n -t 5 -c none all
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return 1
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fi
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for iparg in ${line}; do
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case "${iparg}" in
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address=*|netmask=*|gateway=*|dns0=*|dns1=*)
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echo "net_${iparg}" >> "${net_env}"
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;;
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esac
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done
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echo -n "${ipconfig_out}" | while read line; do
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[ "${line#"IP-Config:"}" != "${line}" ] && continue
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line="$(echo "${line}" | sed -e 's/ :/:/g;s/: /=/g')"
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for iparg in ${line}; do
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case "${iparg}" in
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address=*|netmask=*|gateway=*|dns0=*|dns1=*)
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echo "net_${iparg}" >> "${net_env}"
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;;
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esac
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done
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done
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. "${net_env}"
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rm -f "${net_env}"
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. "${net_env}"
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rm -f "${net_env}"
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echo "IP-Config: device=${net_device} ip=${net_address}/${net_netmask} gw=${net_gateway} dns0=${net_dns0} dns1=${net_dns1}"
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echo "IP-Config: device=${net_device} ip=${net_address}/${net_netmask} gw=${net_gateway} dns0=${net_dns0} dns1=${net_dns1}"
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[ -n "${net_address}" ]
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[ -n "${net_address}" ]
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}
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sshcs_net_done() {
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# we are done with the network
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if [ -n "${net_device}" ]; then
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dbg "Setting network device=${net_device} down"
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ip addr flush dev "${net_device}"
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ip link set dev "${net_device}" down
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fi
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# we are done with the network
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if [ -n "${net_device}" ]; then
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dbg "Setting network device=${net_device} down"
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ip addr flush dev "${net_device}"
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ip link set dev "${net_device}" down
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fi
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}
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sshcs_trapped_timeout() {
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err "Timeout reached! Powering off."
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poweroff -f
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exit
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err "Timeout reached! Powering off."
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poweroff -f
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exit
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}
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sshcs_trap_timeout() {
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local pid_init=$$
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local pid_init=$$
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if [ ${sshcs_opt_timeout_poweroff} -gt 0 ]; then
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echo ""
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echo "WARNING! Automatic poweroff will be triggered in ${sshcs_opt_timeout_poweroff}s"
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echo "To deactivate, please unlock devices"
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echo ""
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trap sshcs_trapped_timeout SIGALRM
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(
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sleep ${sshcs_opt_timeout_poweroff}
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kill -SIGALRM ${pid_init}
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# Signal is not processed if cryptsetup is waiting for the password
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killall cryptsetup > /dev/null 2>&1
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) &
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pid_timeout=$!
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fi
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if [ ${sshcs_opt_timeout_poweroff} -gt 0 ]; then
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echo ""
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echo "WARNING! Automatic poweroff will be triggered in ${sshcs_opt_timeout_poweroff}s"
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echo "To deactivate, please unlock devices"
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trap sshcs_trapped_timeout SIGALRM
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(
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sleep ${sshcs_opt_timeout_poweroff}
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kill -SIGALRM ${pid_init}
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# Signal is not processed if cryptsetup is waiting for the password
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killall cryptsetup > /dev/null 2>&1
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) &
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pid_timeout=$!
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fi
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}
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sshcs_untrap_timeout() {
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[ -z "${pid_timeout}" ] && return 0
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kill ${pid_timeout}
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trap - SIGALRM
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msg "Timeout cleared."
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[ -z "${pid_timeout}" ] && return 0
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# Notes:
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# If there was a running SSH shell, it may also try to kill it.
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# This only kills the spawned subshell, leaving the 'sleep' command still
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# running until done (which is not an issue).
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proc_parse_stat ${pid_timeout} && kill ${pid_timeout}
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pid_timeout=
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trap - SIGALRM
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msg "Timeout cleared."
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}
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sshcs_unlock() {
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sshcs_trap_timeout
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sshcs_shell_run() {
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sshcs_trap_timeout
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# actual script (shared with SSH login) unlocking encrypted devices
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. "${sshcs_cryptsetup_script}"
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sshcs_untrap_timeout
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# actual script (shared with SSH login) with which we can unlock devices
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sshcs_unlocked_test=0
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. "${sshcs_shell_script}"
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}
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sshcs_dropbear_unlock() {
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local pid_timeout=
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local dev_pts_mounted=0
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local listen=
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sshcs_dropbear_run() {
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local pid_timeout=
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local dev_pts_mounted=0
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local listen=
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# ensure /dev/pts is present
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if [ ! -d "/dev/pts" ]; then
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mkdir -p "/dev/pts"
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mount -t devpts devpts "/dev/pts"
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dev_pts_mounted=1
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fi
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# ensure /dev/pts is present
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if [ ! -d "/dev/pts" ]; then
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mkdir -p "/dev/pts"
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mount -t devpts devpts "/dev/pts"
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dev_pts_mounted=1
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fi
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# /etc/passwd file for the root user
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echo "root:x:0:0:root:/root:${dropbear_login_shell}" > "/etc/passwd"
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echo "${dropbear_login_shell}" > "/etc/shells"
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# root login script
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cat <<EOF > "${dropbear_login_shell}"
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if [ ${sshcs_opt_use_shell} -eq 0 ]; then
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sshcs_shell_script=${sshcs_cryptsetup_script}
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else
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cat <<EOF > "${sshcs_shell_script}"
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#!/usr/bin/ash
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. "/init_functions"
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. "/usr/local/bin/ssh-cryptsetup-tools"
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|
||||
if [ ! -f "${sshcs_cryptsetup_script}" ]; then
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err "No cryptsetup script present! Please retry."
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exit 0
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fi
|
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|
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if [ -c "/dev/mapper/control" ]; then
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CSQUIET=
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. "${sshcs_cryptsetup_script}"
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|
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echo ""
|
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echo "cryptsetup succeeded! Boot sequence should go on."
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echo "Please wait and retry for standard SSH service."
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else
|
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err "Device resources missing! Please retry."
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fi
|
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echo ""
|
||||
echo "Call ${sshcs_cryptsetup_script} to try unlocking device(s)"
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||||
|
||||
# Now give the user its shell
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/usr/bin/ash
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|
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# Check whether we are fully done
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sshcs_check_done 1
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EOF
|
||||
chmod a+x "${dropbear_login_shell}"
|
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chmod a+x "${sshcs_shell_script}"
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fi
|
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|
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[ ! -d "/var/log" ] && mkdir -p "/var/log"
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touch "/var/log/lastlog"
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# /etc/passwd file for the root user
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echo "root:x:0:0:root:/root:${sshcs_shell_script}" > "/etc/passwd"
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echo "${sshcs_shell_script}" > "/etc/shells"
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msg "Starting dropbear ..."
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dropbear -Esgjk -P "${path_dropbear_pid}" ${sshcs_opt_listen}
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[ ! -d "/var/log" ] && mkdir -p "/var/log"
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touch "/var/log/lastlog"
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|
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# Actual unlocking
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sshcs_unlock
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msg "Starting dropbear ..."
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dropbear -Esgjk -P "${path_dropbear_pid}" ${sshcs_opt_listen}
|
||||
|
||||
# cleanup dropbear
|
||||
if [ -f "${path_dropbear_pid}" ]; then
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||||
msg "Stopping dropbear ..."
|
||||
kill $(cat "${path_dropbear_pid}")
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||||
rm -f "${path_dropbear_pid}"
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fi
|
||||
rm -f "${sshcs_cryptsetup_script}" "${dropbear_login_shell}" "/etc/passwd" "/etc/shells" "/var/log/lastlog"
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||||
|
||||
# cleanup /dev/pts if necessary
|
||||
if [ ${dev_pts_mounted} -ne 0 ]; then
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umount "/dev/pts"
|
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rm -R "/dev/pts"
|
||||
fi
|
||||
# Actual unlocking shell
|
||||
sshcs_shell_run
|
||||
}
|
||||
|
||||
sshcs_cryptpart_process() {
|
||||
# ensure there is a device (handle 'UUID=' format)
|
||||
[ -z "${cryptdev}" ] && return 0
|
||||
[ "${cryptdev#UUID=}" != "${cryptdev}" ] && cryptdev="/dev/disk/by-uuid/${cryptdev#UUID=}"
|
||||
local cryptdev_orig cryptopt cryptargs
|
||||
|
||||
# get crypt options
|
||||
cryptargs=
|
||||
for cryptopt in ${cryptoptions//,/ }; do
|
||||
case ${cryptopt} in
|
||||
discard)
|
||||
cryptargs="${cryptargs} --allow-discards"
|
||||
;;
|
||||
# ensure there is a device (handle 'UUID=' format)
|
||||
[ -z "${cryptdev}" ] && return 0
|
||||
[ "${cryptdev#UUID=}" != "${cryptdev}" ] && cryptdev="/dev/disk/by-uuid/${cryptdev#UUID=}"
|
||||
|
||||
luks)
|
||||
;;
|
||||
# get crypt options
|
||||
cryptargs=
|
||||
for cryptopt in ${cryptoptions//,/ }; do
|
||||
case ${cryptopt} in
|
||||
discard)
|
||||
cryptargs="${cryptargs} --allow-discards"
|
||||
;;
|
||||
|
||||
*)
|
||||
echo "Device ${cryptdev} encryption option '${cryptopt}' not known, ignoring."
|
||||
;;
|
||||
esac
|
||||
done
|
||||
luks)
|
||||
;;
|
||||
|
||||
# ensure device is encrypted and handled
|
||||
cryptdev_orig=${cryptdev}
|
||||
if cryptdev=$(resolve_device "${cryptdev_orig}" ${rootdelay}); then
|
||||
if cryptsetup isLuks "${cryptdev}" >/dev/null 2>&1; then
|
||||
dbg "Adding crypt device=${cryptdev} type=${crypttype} name=${cryptname} args=<${cryptargs}> in setup script"
|
||||
*)
|
||||
echo "Device ${cryptdev} encryption option '${cryptopt}' not known, ignoring."
|
||||
;;
|
||||
esac
|
||||
done
|
||||
|
||||
# ensure device is encrypted and handled
|
||||
cryptdev_orig=${cryptdev}
|
||||
if cryptdev=$(resolve_device "${cryptdev_orig}" ${rootdelay}); then
|
||||
if cryptsetup isLuks "${cryptdev}" >/dev/null 2>&1; then
|
||||
dbg "Adding crypt device=${cryptdev} type=${crypttype} name=${cryptname} args=<${cryptargs}> in setup script"
|
||||
|
||||
# update script used to unlock device either in console or SSH
|
||||
[ -s "${sshcs_cryptsetup_script}" ] || cat <<'EOF' > "${sshcs_cryptsetup_script}"
|
||||
#!/usr/bin/ash
|
||||
|
||||
. "/usr/local/bin/ssh-cryptsetup-tools"
|
||||
|
||||
# update script used to unlock device either in console or SSH
|
||||
[ -s "${sshcs_cryptsetup_script}" ] || cat <<EOF > "${sshcs_cryptsetup_script}"
|
||||
cycle_or_retry() {
|
||||
local res
|
||||
local res
|
||||
|
||||
read -n 1 -s -t 5 -p "Whithin 5s press 'P' to poweroff, 'R' to reboot or any other key to retry. " res
|
||||
echo ""
|
||||
if [ "\${res}" = "P" ]; then
|
||||
poweroff -f
|
||||
elif [ "\${res}" = "R" ]; then
|
||||
reboot -f
|
||||
fi
|
||||
read -n 1 -s -t 5 -p "Within 5s press 'P' to poweroff, 'R' to reboot or any other key to retry. " res
|
||||
echo ""
|
||||
[ "${res}" == "P" ] && poweroff -f
|
||||
[ "${res}" == "R" ] && reboot -f
|
||||
}
|
||||
|
||||
try_unlock() {
|
||||
EOF
|
||||
|
||||
cat <<EOF >> "${sshcs_cryptsetup_script}"
|
||||
# loop until device is available
|
||||
while [ ! -e "/dev/mapper/${cryptname}" ]; do
|
||||
cat <<EOF >> "${sshcs_cryptsetup_script}"
|
||||
# loop until device is available
|
||||
while [ ! -e "/dev/mapper/${cryptname}" ]; do
|
||||
if [ \${sshcs_unlocked_test:-0} -eq 1 ]; then
|
||||
sshcs_unlocked=0
|
||||
return
|
||||
fi
|
||||
if cryptsetup open --type "${crypttype}" "${cryptdev}" "${cryptname}" ${cryptargs} "\${CSQUIET}"; then
|
||||
if poll_device "/dev/mapper/${cryptname}" ${rootdelay}; then
|
||||
killall cryptsetup > /dev/null 2>&1
|
||||
break
|
||||
fi
|
||||
err "Device still not mapped! Please wait or retry."
|
||||
elif [ ! -e "/dev/mapper/${cryptname}" ]; then
|
||||
err "cryptsetup failed! Please retry."
|
||||
else
|
||||
if poll_device "/dev/mapper/${cryptname}" ${rootdelay}; then
|
||||
killall cryptsetup > /dev/null 2>&1
|
||||
break
|
||||
fi
|
||||
err "Device still not mapped! Please wait or retry."
|
||||
elif [ ! -e "/dev/mapper/${cryptname}" ]; then
|
||||
err "cryptsetup failed! Please retry."
|
||||
else
|
||||
break
|
||||
fi
|
||||
|
||||
cycle_or_retry
|
||||
done
|
||||
done
|
||||
EOF
|
||||
else
|
||||
err "Failed to manage encrypted device ${cryptdev_orig}: not a LUKS volume."
|
||||
fi
|
||||
else
|
||||
err "Failed to manage encrypted device ${cryptdev_orig}: not a LUKS volume."
|
||||
fi
|
||||
fi
|
||||
}
|
||||
|
||||
sshcs_cryptpart_setup() {
|
||||
local cryptdev crypttype cryptname cryptpass cryptoptions
|
||||
|
||||
# check encrypted devices to handle
|
||||
cryptdev=
|
||||
crypttype=luks
|
||||
while read cryptname cryptdev cryptpass cryptoptions; do
|
||||
# skip comment lines
|
||||
[ "${cryptname:0:1}" = "#" ] && continue
|
||||
# skip devices with given password
|
||||
[ -n "${cryptpass}" ] && [ "${cryptpass}" != "none" ] && [ "${cryptpass}" != "-" ] && continue
|
||||
|
||||
sshcs_cryptpart_process
|
||||
done < "${etc_crypttab}"
|
||||
|
||||
# Nothing else to do if there is no device we can unlock
|
||||
[ -s "${sshcs_cryptsetup_script}" ] || return 0
|
||||
|
||||
cat <<'EOF' >> "${sshcs_cryptsetup_script}"
|
||||
# No other device to unlock
|
||||
}
|
||||
|
||||
if [ -c "/dev/mapper/control" ]; then
|
||||
CSQUIET=
|
||||
try_unlock
|
||||
|
||||
[ ${sshcs_unlocked_test:-0} -eq 1 ] && return
|
||||
sshcs_check_done 0
|
||||
else
|
||||
if [ \${sshcs_unlocked_test:-0} -eq 1 ]; then
|
||||
sshcs_unlocked=0
|
||||
return
|
||||
fi
|
||||
echo ""
|
||||
err "Device resources missing! Please retry."
|
||||
fi
|
||||
EOF
|
||||
chmod a+x "${sshcs_cryptsetup_script}"
|
||||
}
|
||||
|
||||
run_hook() {
|
||||
local etc_crypttab="/etc/crypttab"
|
||||
local sshcs_env="/etc/initcpio/sshcs_env"
|
||||
local path_dropbear_pid="/.dropbear.pid"
|
||||
local dropbear_login_shell="/.cryptsetup_shell.sh"
|
||||
local sshcs_cryptsetup_script="/.cryptsetup_script.sh"
|
||||
local net_env="/.net_env.sh"
|
||||
local line iparg net_address net_device ipconfig_out net_netmask net_gateway net_dns0 net_dns1
|
||||
local cryptdev cryptdev_orig crypttype cryptname cryptpass cryptoptions cryptopt cryptargs CSQUIET
|
||||
local etc_crypttab="/etc/crypttab"
|
||||
local path_dropbear_pid="/.dropbear.pid"
|
||||
local sshcs_shell_script="/.sshcs_shell.sh"
|
||||
local net_env="/.sshcs_net_env.sh"
|
||||
local line net_device
|
||||
local CSQUIET
|
||||
|
||||
# Load our options
|
||||
sshcs_env_load
|
||||
# Note: options were loaded already
|
||||
|
||||
# sanity check: crypttab should be present
|
||||
[ ! -e "${etc_crypttab}" ] && {
|
||||
dbg "No crypttab configuration to process"
|
||||
return 0
|
||||
}
|
||||
# sanity check: crypttab should be present
|
||||
[ ! -e "${etc_crypttab}" ] && {
|
||||
dbg "No crypttab configuration to process"
|
||||
return 0
|
||||
}
|
||||
|
||||
modprobe -a -q dm-crypt >/dev/null 2>&1
|
||||
[ "${quiet}" = "y" ] && CSQUIET=">/dev/null"
|
||||
# Initialize random generator ASAP.
|
||||
# May delay first SSH login by a few seconds otherwise.
|
||||
(dd if=/dev/urandom of=/dev/null bs=4 count=1 status=none > /dev/null 2>&1) &
|
||||
(dd if=/dev/random of=/dev/null bs=4 count=1 status=none > /dev/null 2>&1) &
|
||||
|
||||
umask 0022
|
||||
modprobe -a -q dm-crypt >/dev/null 2>&1
|
||||
[ "${quiet}" = "y" ] && CSQUIET=">/dev/null"
|
||||
|
||||
# check encrypted devices to handle
|
||||
cryptdev=
|
||||
crypttype=luks
|
||||
while read cryptname cryptdev cryptpass cryptoptions; do
|
||||
# skip comment lines
|
||||
[ "${cryptname:0:1}" = "#" ] && continue
|
||||
# skip devices with given password
|
||||
[ -n "${cryptpass}" ] && [ "${cryptpass}" != "none" ] && [ "${cryptpass}" != "-" ] && continue
|
||||
umask 0022
|
||||
|
||||
sshcs_cryptpart_process
|
||||
done < "${etc_crypttab}"
|
||||
# Setup script used to unlock device either in console or SSH
|
||||
sshcs_cryptpart_setup
|
||||
if [ ! -e "${sshcs_cryptsetup_script}" ]; then
|
||||
err "No encrypted device found! Skipping crypt remote unlocking."
|
||||
return 0
|
||||
fi
|
||||
|
||||
if [ ! -e "${sshcs_cryptsetup_script}" ]; then
|
||||
err "No encrypted device found! Skipping crypt remote unlocking."
|
||||
return 0
|
||||
fi
|
||||
# start and check network
|
||||
if ! sshcs_net_start; then
|
||||
err "Net interface not available! Skipping crypt remote unlocking."
|
||||
# We still allow to unlock locally with timeout
|
||||
sshcs_shell_run
|
||||
return 0
|
||||
fi
|
||||
|
||||
# start and check network
|
||||
if ! sshcs_net_start; then
|
||||
err "Net interface not available! Skipping crypt remote unlocking."
|
||||
# We still allow to unlock locally with timeout
|
||||
sshcs_unlock
|
||||
# stop the network if possible
|
||||
sshcs_net_done
|
||||
return 0
|
||||
fi
|
||||
|
||||
# time to unlock (through console or dropbear)
|
||||
sshcs_dropbear_unlock
|
||||
# stop the network before going on in boot sequence
|
||||
sshcs_net_done
|
||||
# time to unlock (through console or dropbear)
|
||||
sshcs_dropbear_run
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,188 @@
|
|||
#!/usr/bin/ash
|
||||
|
||||
. "/init_functions"
|
||||
|
||||
dbg () {
|
||||
[ ${sshcs_opt_debug} != 0 ] && echo "$@"
|
||||
}
|
||||
|
||||
sshcs_env_load() {
|
||||
local sshcs_env="/etc/initcpio/sshcs_env"
|
||||
|
||||
local debug_default=0
|
||||
local net_wol_default=g
|
||||
local timeout_ipconfig_default=10
|
||||
local timeout_poweroff_min=120
|
||||
local use_shell_default=0
|
||||
|
||||
[ ${sshcs_env_loaded:-0} -eq 1 ] && return
|
||||
[ -e "${sshcs_env}" ] && . "${sshcs_env}"
|
||||
sshcs_env_loaded=1
|
||||
[ -z "${sshcs_opt_debug}" ] && sshcs_opt_debug=${debug_default}
|
||||
[ -z "${sshcs_opt_net_wol}" ] && sshcs_opt_net_wol=${net_wol_default}
|
||||
[ -z "${sshcs_opt_timeout_ipconfig}" ] && sshcs_opt_timeout_ipconfig=${timeout_ipconfig_default}
|
||||
[ -n "${sshcs_opt_listen}" ] && sshcs_opt_listen="-p ${sshcs_opt_listen}"
|
||||
[ -z "${sshcs_opt_timeout_poweroff}" ] && sshcs_opt_timeout_poweroff=${timeout_poweroff_min}
|
||||
[ -z "${sshcs_opt_use_shell}" ] && sshcs_opt_use_shell=${use_shell_default}
|
||||
[ ${sshcs_opt_timeout_poweroff} -ge 0 ] && [ ${sshcs_opt_timeout_poweroff} -lt ${timeout_poweroff_min} ] && sshcs_opt_timeout_poweroff=${timeout_poweroff_min}
|
||||
|
||||
sshcs_cryptsetup_script="/.sshcs_cryptsetup_script.sh"
|
||||
}
|
||||
|
||||
proc_parse_stat() {
|
||||
local unused
|
||||
|
||||
pid=$1
|
||||
cmd=
|
||||
ppid=
|
||||
[ ! -e /proc/${pid}/stat ] && return 1
|
||||
read unused cmd unused ppid unused < /proc/${pid}/stat
|
||||
}
|
||||
|
||||
proc_find_parent_cmd() {
|
||||
pid=$1
|
||||
proc_parse_stat ${pid} || return 1
|
||||
while [ ${ppid} -gt 1 ]
|
||||
do
|
||||
proc_parse_stat ${ppid} || return 1
|
||||
if [ "${cmd}" == "($2)" ]; then
|
||||
ppid=${pid}
|
||||
pid=$1
|
||||
return 0
|
||||
fi
|
||||
pid=${ppid}
|
||||
done
|
||||
|
||||
return 1
|
||||
}
|
||||
|
||||
proc_is_console() {
|
||||
if [ -z "${is_console:-}" ]; then
|
||||
# We are in console if we were not forked from dropbear.
|
||||
is_console=1
|
||||
proc_find_parent_cmd $$ "dropbear" && is_console=0
|
||||
fi
|
||||
|
||||
[ "${is_console}" -eq 1 ]
|
||||
}
|
||||
|
||||
sshcs_cleanup() {
|
||||
local pgrep_output
|
||||
|
||||
# Reminders:
|
||||
# We are called when devices have been unlocked.
|
||||
#
|
||||
# We are only called as part of the main shell (whether on console - the init
|
||||
# script - or through SSH - as the user login shell), and once we return our
|
||||
# parent shell will end.
|
||||
#
|
||||
# The unlocking script does 'killall cryptsetup' after each successful unlock,
|
||||
# which is used to wakeup any other running unlocking script.
|
||||
# Thus as long as all devices have been unlocked, we don't expect any script
|
||||
# to be stuck on 'cryptsetup' calls.
|
||||
|
||||
if proc_is_console; then
|
||||
# We are in the console.
|
||||
# It is time to properly end the processes we started and files we created.
|
||||
# When using a shell - instead of directly calling the unlocking script -
|
||||
# we also need to signal any SSH shell so that it is properly cleaned too.
|
||||
|
||||
# cleanup dropbear
|
||||
if [ -f "${path_dropbear_pid}" ]; then
|
||||
msg "Stopping dropbear ..."
|
||||
kill $(cat "${path_dropbear_pid}")
|
||||
rm -f "${path_dropbear_pid}"
|
||||
fi
|
||||
|
||||
if [ ${sshcs_opt_use_shell} -eq 1 ]; then
|
||||
# Find and kill all shells spawned by SSH.
|
||||
# This is necessary to properly terminate both these shells and the spawned
|
||||
# SSH processes.
|
||||
# Reminder: "... | ..." does fork a subshell
|
||||
dbg "Searching SSH shells ..."
|
||||
pgrep_output=$(pgrep /usr/bin/ash)
|
||||
pgrep_output=$(echo "${pgrep_output}" | grep -E -v "^(|1|$$)$")
|
||||
echo "${pgrep_output}" | while read pid; do
|
||||
proc_parse_stat ${pid} || continue
|
||||
proc_find_parent_cmd ${pid} "dropbear" || continue
|
||||
dbg "Killing SSH shell pid=${pid}"
|
||||
kill -SIGHUP ${pid}
|
||||
done
|
||||
fi
|
||||
|
||||
# cleanup /dev/pts if necessary
|
||||
if [ ${dev_pts_mounted} -ne 0 ]; then
|
||||
umount "/dev/pts"
|
||||
rm -R "/dev/pts"
|
||||
fi
|
||||
|
||||
# stop the network before going on in boot sequence
|
||||
sshcs_net_done
|
||||
|
||||
rm -f "${sshcs_cryptsetup_script}" "${sshcs_shell_script}" "/etc/passwd" "/etc/shells" "/var/log/lastlog"
|
||||
elif [ ${sshcs_opt_use_shell} -eq 1 ]; then
|
||||
# We are in a SSH shell session.
|
||||
|
||||
# Find and kill console shell.
|
||||
# This is necessary so that our script launched from the init process can
|
||||
# finally check that devices have been properly unlocked, properly end and
|
||||
# let the init process end booting.
|
||||
# Note: as a side effect, this will also kill the shell that was forked to
|
||||
# trigger a timeout, which is fine (we want to kill it, either from here or
|
||||
# from the init shell).
|
||||
dbg "Searching console shells ..."
|
||||
pgrep_output=$(pgrep /usr/bin/ash)
|
||||
pgrep_output=$(echo "${pgrep_output}" | grep -E -v "^(|1|$$)$")
|
||||
echo "${pgrep_output}" | while read pid; do
|
||||
proc_find_parent_cmd ${pid} "dropbear" && continue
|
||||
dbg "Killing console shell pid=${pid}"
|
||||
kill -SIGHUP ${pid}
|
||||
done
|
||||
fi
|
||||
# else: when in SSH shell script, we have nothing else to do other than exit.
|
||||
}
|
||||
|
||||
sshcs_check_done() {
|
||||
# Whether we are called from the main script: that is whether the shell will
|
||||
# end when we return.
|
||||
local finalize=$1
|
||||
|
||||
# This is always the main script when not using shell
|
||||
[ ${sshcs_opt_use_shell} -eq 0 ] && finalize=1
|
||||
|
||||
# Reset timeout when applicable: only possible from init script.
|
||||
proc_is_console && type sshcs_untrap_timeout > /dev/null 2>&1 && sshcs_untrap_timeout
|
||||
|
||||
# Check devices are unlocked.
|
||||
sshcs_unlocked_test=1
|
||||
sshcs_unlocked=1
|
||||
. "${sshcs_cryptsetup_script}"
|
||||
if [ ${sshcs_unlocked} -ne 1 ]; then
|
||||
echo ""
|
||||
# When finalizing in console, power off
|
||||
if [ ${finalize} -eq 1 ] && proc_is_console; then
|
||||
err "Devices are still locked! Powering off."
|
||||
poweroff -f
|
||||
fi
|
||||
|
||||
# When in shell or SSH, let user try again
|
||||
err "Devices are still locked! Please retry."
|
||||
return
|
||||
fi
|
||||
|
||||
if [ ${finalize} -eq 0 ]; then
|
||||
# Kill our parent (the interactive shell); the script that launched it will
|
||||
# do finalization.
|
||||
proc_parse_stat $$
|
||||
kill -SIGHUP ${ppid}
|
||||
exit 0
|
||||
fi
|
||||
|
||||
echo ""
|
||||
echo "cryptsetup succeeded! Boot sequence should go on."
|
||||
proc_is_console || echo "Please wait and reconnect to nominal SSH service."
|
||||
|
||||
sshcs_cleanup
|
||||
}
|
||||
|
||||
sshcs_env_load
|
||||
|
|
@ -1,109 +1,113 @@
|
|||
#!/bin/bash
|
||||
|
||||
sshcs_check_nonempty() {
|
||||
local filepath="$1"
|
||||
local filepath="$1"
|
||||
|
||||
[ -e "${filepath}" ] && grep -q -v '^\s*\(#\|$\)' "${filepath}"
|
||||
[ -e "${filepath}" ] && grep -q -v '^\s*\(#\|$\)' "${filepath}"
|
||||
}
|
||||
|
||||
sshcs_check_keys() {
|
||||
local dropbear_keyfile
|
||||
local openssh_keyfile
|
||||
local fingerprint
|
||||
local dropbear_keyfile
|
||||
local openssh_keyfile
|
||||
local fingerprint
|
||||
|
||||
for keytype in "${dropbear_key_types[@]}"; do
|
||||
dropbear_keyfile=${dropbear_keyfile_prefix}${keytype}${dropbear_keyfile_suffix}
|
||||
openssh_keyfile=${openssh_keyfile_prefix}${keytype}${openssh_keyfile_suffix}
|
||||
for keytype in "${dropbear_key_types[@]}"; do
|
||||
dropbear_keyfile=${dropbear_keyfile_prefix}${keytype}${dropbear_keyfile_suffix}
|
||||
openssh_keyfile=${openssh_keyfile_prefix}${keytype}${openssh_keyfile_suffix}
|
||||
|
||||
# Prefer OpenSSH keys, or generate missing ones
|
||||
if [ -e "${openssh_keyfile}" ]; then
|
||||
#echo "Copying OpenSSH ${keytype} host key for dropbear ..."
|
||||
dropbearconvert openssh dropbear "${openssh_keyfile}" "${dropbear_keyfile}" > /dev/null 2>&1
|
||||
elif [ ! -e "${dropbear_keyfile}" ]; then
|
||||
#echo "Generating ${keytype} host key for dropbear ..."
|
||||
dropbearkey -t "${keytype}" -f "${dropbear_keyfile}" > /dev/null 2>&1
|
||||
fi
|
||||
fingerprint=$(dropbearkey -y -f "${dropbear_keyfile}" | sed -n '/^Fingerprint:/ {s/Fingerprint: *//; p}')
|
||||
echo "$(basename "${dropbear_keyfile}") : ${fingerprint}"
|
||||
done
|
||||
# Prefer OpenSSH keys, or generate missing ones
|
||||
if [ -e "${openssh_keyfile}" ]; then
|
||||
#echo "Copying OpenSSH ${keytype} host key for dropbear ..."
|
||||
dropbearconvert openssh dropbear "${openssh_keyfile}" "${dropbear_keyfile}" > /dev/null 2>&1
|
||||
elif [ ! -e "${dropbear_keyfile}" ]; then
|
||||
#echo "Generating ${keytype} host key for dropbear ..."
|
||||
dropbearkey -t "${keytype}" -f "${dropbear_keyfile}" > /dev/null 2>&1
|
||||
fi
|
||||
fingerprint=$(dropbearkey -y -f "${dropbear_keyfile}" | sed -n '/^Fingerprint:/ {s/Fingerprint: *//; p}')
|
||||
echo "$(basename "${dropbear_keyfile}") : ${fingerprint}"
|
||||
done
|
||||
}
|
||||
|
||||
build() {
|
||||
local etc_crypttab="/etc/crypttab"
|
||||
local dropbear_authorized_keys="/etc/dropbear/initrd.authorized_keys"
|
||||
local sshcs_env="/etc/initcpio/sshcs_env"
|
||||
local dropbear_key_types=( "rsa" "ecdsa" "ed25519" )
|
||||
local dropbear_keyfile_prefix="/etc/dropbear/dropbear_"
|
||||
local dropbear_keyfile_suffix="_host_key"
|
||||
local openssh_keyfile_prefix="/etc/ssh/ssh_host_"
|
||||
local openssh_keyfile_suffix="_key"
|
||||
local etc_crypttab="/etc/crypttab"
|
||||
local dropbear_authorized_keys="/etc/dropbear/initrd.authorized_keys"
|
||||
local sshcs_env="/etc/initcpio/sshcs_env"
|
||||
local dropbear_key_types=( "rsa" "ecdsa" "ed25519" )
|
||||
local dropbear_keyfile_prefix="/etc/dropbear/dropbear_"
|
||||
local dropbear_keyfile_suffix="_host_key"
|
||||
local openssh_keyfile_prefix="/etc/ssh/ssh_host_"
|
||||
local openssh_keyfile_suffix="_key"
|
||||
|
||||
# Check we are needed
|
||||
if ! sshcs_check_nonempty "${dropbear_authorized_keys}"; then
|
||||
echo "There is no root key(s) in ${dropbear_authorized_keys}. Skipping."
|
||||
return 0
|
||||
fi
|
||||
if ! sshcs_check_nonempty "${etc_crypttab}"; then
|
||||
echo "There is no device in ${etc_crypttab}. Skipping."
|
||||
return 0
|
||||
fi
|
||||
# Check we are needed
|
||||
if ! sshcs_check_nonempty "${dropbear_authorized_keys}"; then
|
||||
echo "There is no root key(s) in ${dropbear_authorized_keys}. Skipping."
|
||||
return 0
|
||||
fi
|
||||
if ! sshcs_check_nonempty "${etc_crypttab}"; then
|
||||
echo "There is no device in ${etc_crypttab}. Skipping."
|
||||
return 0
|
||||
fi
|
||||
|
||||
umask 0022
|
||||
umask 0022
|
||||
|
||||
sshcs_check_keys
|
||||
sshcs_check_keys
|
||||
|
||||
add_checked_modules "/drivers/net/"
|
||||
# Note: parts of this script (modules/binaries added) are the same than the
|
||||
# 'encrypt' install script (/usr/lib/initcpio/install/encrypt) which is the
|
||||
# nominal one to deal with encrypted volumes at boot time.
|
||||
add_module dm-crypt
|
||||
# Note: crypto modules are necessary
|
||||
if [ -n "${CRYPTO_MODULES}" ]; then
|
||||
local mod
|
||||
for mod in ${CRYPTO_MODULES}; do
|
||||
add_module "${mod}"
|
||||
done
|
||||
else
|
||||
add_all_modules "/crypto/"
|
||||
fi
|
||||
|
||||
# Note: dmsetup is necessary for device mapper features
|
||||
add_binary "cryptsetup"
|
||||
add_binary "dmsetup"
|
||||
add_binary "dropbear"
|
||||
add_binary "ip"
|
||||
add_binary "/usr/lib/initcpio/ipconfig" "/sbin/ipconfig"
|
||||
|
||||
# Our hook files
|
||||
[ -e "${sshcs_env}" ] && add_file "${sshcs_env}"
|
||||
|
||||
# auth-related files
|
||||
add_file "/lib/libnss_files.so"
|
||||
|
||||
# SSH-related files
|
||||
add_file "${dropbear_authorized_keys}" "/root/.ssh/authorized_keys"
|
||||
for keytype in "${dropbear_key_types[@]}"; do
|
||||
add_file "${dropbear_keyfile_prefix}${keytype}${dropbear_keyfile_suffix}"
|
||||
add_checked_modules "/drivers/net/"
|
||||
# Note: parts of this script (modules/binaries added) are the same than the
|
||||
# 'encrypt' install script (/usr/lib/initcpio/install/encrypt) which is the
|
||||
# nominal one to deal with encrypted volumes at boot time.
|
||||
add_module dm-crypt
|
||||
# Note: crypto modules are necessary
|
||||
if [ -n "${CRYPTO_MODULES}" ]; then
|
||||
local mod
|
||||
for mod in ${CRYPTO_MODULES}; do
|
||||
add_module "${mod}"
|
||||
done
|
||||
else
|
||||
add_all_modules "/crypto/"
|
||||
fi
|
||||
|
||||
# cryptsetup-related files
|
||||
add_file "${etc_crypttab}"
|
||||
add_file "/usr/lib/udev/rules.d/10-dm.rules"
|
||||
add_file "/usr/lib/udev/rules.d/13-dm-disk.rules"
|
||||
add_file "/usr/lib/udev/rules.d/95-dm-notify.rules"
|
||||
add_file "/usr/lib/initcpio/udev/11-dm-initramfs.rules" "/usr/lib/udev/rules.d/11-dm-initramfs.rules"
|
||||
# Note: dmsetup is necessary for device mapper features
|
||||
add_binary "cryptsetup"
|
||||
add_binary "dmsetup"
|
||||
add_binary "dropbear"
|
||||
add_binary "ip"
|
||||
add_binary "/usr/lib/initcpio/ipconfig" "/bin/ipconfig"
|
||||
add_binary "ethtool"
|
||||
|
||||
# At least with LUKS v2 volumes, cryptsetup calls pthread_cancel(), which
|
||||
# dlopen()s libgcc_s.so.1.
|
||||
# See the nominal 'encrypt' module, and similar/related bug reports (e.g.
|
||||
# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=950254).
|
||||
add_binary "/usr/lib/libgcc_s.so.1"
|
||||
# Our hook files
|
||||
[ -e "${sshcs_env}" ] && add_file "${sshcs_env}"
|
||||
# Note: use /usr/local/bin, even though everything actually points to /usr/bin
|
||||
# in initramfs.
|
||||
add_file "/usr/lib/initcpio/hooks/ssh-cryptsetup-tools" "/usr/local/bin/ssh-cryptsetup-tools"
|
||||
|
||||
add_runscript
|
||||
# auth-related files
|
||||
add_file "/lib/libnss_files.so"
|
||||
|
||||
# SSH-related files
|
||||
add_file "${dropbear_authorized_keys}" "/root/.ssh/authorized_keys"
|
||||
for keytype in "${dropbear_key_types[@]}"; do
|
||||
add_file "${dropbear_keyfile_prefix}${keytype}${dropbear_keyfile_suffix}"
|
||||
done
|
||||
|
||||
# cryptsetup-related files
|
||||
add_file "${etc_crypttab}"
|
||||
add_file "/usr/lib/udev/rules.d/10-dm.rules"
|
||||
add_file "/usr/lib/udev/rules.d/13-dm-disk.rules"
|
||||
add_file "/usr/lib/udev/rules.d/95-dm-notify.rules"
|
||||
add_file "/usr/lib/initcpio/udev/11-dm-initramfs.rules" "/usr/lib/udev/rules.d/11-dm-initramfs.rules"
|
||||
|
||||
# At least with LUKS v2 volumes, cryptsetup calls pthread_cancel(), which
|
||||
# dlopen()s libgcc_s.so.1.
|
||||
# See the nominal 'encrypt' module, and similar/related bug reports (e.g.
|
||||
# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=950254).
|
||||
add_binary "/usr/lib/libgcc_s.so.1"
|
||||
|
||||
add_runscript
|
||||
}
|
||||
|
||||
help() {
|
||||
cat <<EOF
|
||||
cat <<EOF
|
||||
This hook allows for LUKS encrypted devices to be unlocked either locally
|
||||
(boot console) or remotely over SSH.
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue