Initial commit: Copy encrypt hook from cryptsetup package

5 files changed, 218 insertions, 0 deletions

diff --git a/.SRCINFO b/.SRCINFO
new file mode 100644
index 000000000000..cf25b951641b
--- /dev/null
+++ b/.SRCINFO
@@ -0,0 +1,12 @@
+pkgbase = initcpio-encrypt-remote-luks-header
+	pkgdesc = Modified initcpio encrypt hook capable of using remote LUKS header
+	pkgver = 1.0.0
+	pkgrel = 1
+	arch = any
+	license = GPL
+	source = encrypt_remote_luks_header.hook
+	source = encrypt_remote_luks_header.install
+	sha256sums = 4406f8dc83f4f1b408e49d557515f721d91b358355c71fbe51f74ab27e5c84ff
+	sha256sums = cfe465bdad3d958bb2332a05e04f2e1e884422a5714dfd1a0a3b9b74bf7dc6ae
+
+pkgname = initcpio-encrypt-remote-luks-header
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 000000000000..ce6740e87cf8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+/src/
+/pkg/
+/*.tar.xz
+/*.tar.xz.sig
diff --git a/PKGBUILD b/PKGBUILD
new file mode 100644
index 000000000000..0b3c51b896ef
--- /dev/null
+++ b/PKGBUILD
@@ -0,0 +1,19 @@
+# Author: Emil Lundberg <lundberg.emil@gmail.com>
+
+pkgname=initcpio-encrypt-remote-luks-header
+pkgver=1.0.0
+pkgrel=1
+pkgdesc="Modified initcpio encrypt hook capable of using remote LUKS header"
+arch=('any')
+license=('GPL')
+source=(
+  encrypt_remote_luks_header.hook
+  encrypt_remote_luks_header.install
+)
+sha256sums=('4406f8dc83f4f1b408e49d557515f721d91b358355c71fbe51f74ab27e5c84ff'
+            'cfe465bdad3d958bb2332a05e04f2e1e884422a5714dfd1a0a3b9b74bf7dc6ae')
+
+package() {
+  install -D -m 644 "${srcdir}"/encrypt_remote_luks_header.hook "${pkgdir}"/usr/lib/initcpio/hooks/encrypt_remote_luks_header
+  install -D -m 644 "${srcdir}"/encrypt_remote_luks_header.install "${pkgdir}"/usr/lib/initcpio/install/encrypt_remote_luks_header
+}
diff --git a/encrypt_remote_luks_header.hook b/encrypt_remote_luks_header.hook
new file mode 100644
index 000000000000..819c4cf60fe0
--- /dev/null
+++ b/encrypt_remote_luks_header.hook
@@ -0,0 +1,139 @@
+#!/usr/bin/ash
+
+run_hook() {
+    modprobe -a -q dm-crypt >/dev/null 2>&1
+    [ "${quiet}" = "y" ] && CSQUIET=">/dev/null"
+
+    # Get keyfile if specified
+    ckeyfile="/crypto_keyfile.bin"
+    if [ -n "$cryptkey" ]; then
+        IFS=: read ckdev ckarg1 ckarg2 <<EOF
+$cryptkey
+EOF
+
+        if [ "$ckdev" = "rootfs" ]; then
+            ckeyfile=$ckarg1
+        elif resolved=$(resolve_device "${ckdev}" ${rootdelay}); then
+            case ${ckarg1} in
+                *[!0-9]*)
+                    # Use a file on the device
+                    # ckarg1 is not numeric: ckarg1=filesystem, ckarg2=path
+                    mkdir /ckey
+                    mount -r -t "$ckarg1" "$resolved" /ckey
+                    dd if="/ckey/$ckarg2" of="$ckeyfile" >/dev/null 2>&1
+                    umount /ckey
+                    ;;
+                *)
+                    # Read raw data from the block device
+                    # ckarg1 is numeric: ckarg1=offset, ckarg2=length
+                    dd if="$resolved" of="$ckeyfile" bs=1 skip="$ckarg1" count="$ckarg2" >/dev/null 2>&1
+                    ;;
+            esac
+        fi
+        [ ! -f ${ckeyfile} ] && echo "Keyfile could not be opened. Reverting to passphrase."
+    fi
+
+    if [ -n "${cryptdevice}" ]; then
+        DEPRECATED_CRYPT=0
+        IFS=: read cryptdev cryptname cryptoptions <<EOF
+$cryptdevice
+EOF
+    else
+        DEPRECATED_CRYPT=1
+        cryptdev="${root}"
+        cryptname="root"
+    fi
+
+    warn_deprecated() {
+        echo "The syntax 'root=${root}' where '${root}' is an encrypted volume is deprecated"
+        echo "Use 'cryptdevice=${root}:root root=/dev/mapper/root' instead."
+    }
+
+    for cryptopt in ${cryptoptions//,/ }; do
+        case ${cryptopt} in
+            allow-discards)
+                cryptargs="${cryptargs} --allow-discards"
+                ;;
+            *)
+                echo "Encryption option '${cryptopt}' not known, ignoring." >&2
+                ;;
+        esac
+    done
+
+    if resolved=$(resolve_device "${cryptdev}" ${rootdelay}); then
+        if cryptsetup isLuks ${resolved} >/dev/null 2>&1; then
+            [ ${DEPRECATED_CRYPT} -eq 1 ] && warn_deprecated
+            dopassphrase=1
+            # If keyfile exists, try to use that
+            if [ -f ${ckeyfile} ]; then
+                if eval cryptsetup --key-file ${ckeyfile} open --type luks ${resolved} ${cryptname} ${cryptargs} ${CSQUIET}; then
+                    dopassphrase=0
+                else
+                    echo "Invalid keyfile. Reverting to passphrase."
+                fi
+            fi
+            # Ask for a passphrase
+            if [ ${dopassphrase} -gt 0 ]; then
+                echo ""
+                echo "A password is required to access the ${cryptname} volume:"
+
+                #loop until we get a real password
+                while ! eval cryptsetup open --type luks ${resolved} ${cryptname} ${cryptargs} ${CSQUIET}; do
+                    sleep 2;
+                done
+            fi
+            if [ -e "/dev/mapper/${cryptname}" ]; then
+                if [ ${DEPRECATED_CRYPT} -eq 1 ]; then
+                    export root="/dev/mapper/root"
+                fi
+            else
+                err "Password succeeded, but ${cryptname} creation failed, aborting..."
+                exit 1
+            fi
+        elif [ -n "${crypto}" ]; then
+            [ ${DEPRECATED_CRYPT} -eq 1 ] && warn_deprecated
+            msg "Non-LUKS encrypted device found..."
+            if echo "$crypto" | awk -F: '{ exit(NF == 5) }'; then
+                err "Verify parameter format: crypto=hash:cipher:keysize:offset:skip"
+                err "Non-LUKS decryption not attempted..."
+                return 1
+            fi
+            exe="cryptsetup open --type plain $resolved $cryptname $cryptargs"
+            IFS=: read c_hash c_cipher c_keysize c_offset c_skip <<EOF
+$crypto
+EOF
+            [ -n "$c_hash" ]    && exe="$exe --hash '$c_hash'"
+            [ -n "$c_cipher" ]  && exe="$exe --cipher '$c_cipher'"
+            [ -n "$c_keysize" ] && exe="$exe --key-size '$c_keysize'"
+            [ -n "$c_offset" ]  && exe="$exe --offset '$c_offset'"
+            [ -n "$c_skip" ]    && exe="$exe --skip '$c_skip'"
+            if [ -f "$ckeyfile" ]; then
+                exe="$exe --key-file $ckeyfile"
+            else
+                exe="$exe --verify-passphrase"
+                echo ""
+                echo "A password is required to access the ${cryptname} volume:"
+            fi
+            eval "$exe $CSQUIET"
+
+            if [ $? -ne 0 ]; then
+                err "Non-LUKS device decryption failed. verify format: "
+                err "      crypto=hash:cipher:keysize:offset:skip"
+                exit 1
+            fi
+            if [ -e "/dev/mapper/${cryptname}" ]; then
+                if [ ${DEPRECATED_CRYPT} -eq 1 ]; then
+                    export root="/dev/mapper/root"
+                fi
+            else
+                err "Password succeeded, but ${cryptname} creation failed, aborting..."
+                exit 1
+            fi
+        else
+            err "Failed to open encryption mapping: The device ${cryptdev} is not a LUKS volume and the crypto= paramater was not specified."
+        fi
+    fi
+    rm -f ${ckeyfile}
+}
+
+# vim: set ft=sh ts=4 sw=4 et:
diff --git a/encrypt_remote_luks_header.install b/encrypt_remote_luks_header.install
new file mode 100644
index 000000000000..38e5ddc57b11
--- /dev/null
+++ b/encrypt_remote_luks_header.install
@@ -0,0 +1,44 @@
+#!/bin/bash
+
+build() {
+    local mod
+
+    add_module dm-crypt
+    if [[ $CRYPTO_MODULES ]]; then
+        for mod in $CRYPTO_MODULES; do
+            add_module "$mod"
+        done
+    else
+        add_all_modules '/crypto/'
+    fi
+
+    add_binary "cryptsetup"
+    add_binary "dmsetup"
+    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"
+
+    add_runscript
+}
+
+help() {
+    cat <<HELPEOF
+This hook allows for an encrypted root device. Users should specify the device
+to be unlocked using 'cryptdevice=device:dmname' on the kernel command line,
+where 'device' is the path to the raw device, and 'dmname' is the name given to
+the device after unlocking, and will be available as /dev/mapper/dmname.
+
+For unlocking via keyfile, 'cryptkey=device:fstype:path' should be specified on
+the kernel cmdline, where 'device' represents the raw block device where the key
+exists, 'fstype' is the filesystem type of 'device' (or auto), and 'path' is
+the absolute path of the keyfile within the device.
+
+Without specifying a keyfile, you will be prompted for the password at runtime.
+This means you must have a keyboard available to input it, and you may need
+the keymap hook as well to ensure that the keyboard is using the layout you
+expect.
+HELPEOF
+}
+
+# vim: set ft=sh ts=4 sw=4 et: