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From aa52396c35e76aabd085a819b08167d559042a20 Mon Sep 17 00:00:00 2001
From: rpm-build <rpm-build>
Date: Tue, 3 Nov 2020 08:42:48 -0300
Subject: [PATCH 2/2] Add the option to extract luks passphrase used for
 binding

Usage:

clevis luks pass -d /dev/sda1 -s 1
<passphrase here>
---
 src/luks/clevis-luks-pass        | 64 ++++++++++++++++++++++++++++++++
 src/luks/clevis-luks-pass.1.adoc | 43 +++++++++++++++++++++
 src/luks/meson.build             |  3 ++
 src/luks/tests/meson.build       |  2 +
 src/luks/tests/pass-tang-luks1   | 59 +++++++++++++++++++++++++++++
 src/luks/tests/pass-tang-luks2   | 59 +++++++++++++++++++++++++++++
 6 files changed, 230 insertions(+)
 create mode 100755 src/luks/clevis-luks-pass
 create mode 100644 src/luks/clevis-luks-pass.1.adoc
 create mode 100755 src/luks/tests/pass-tang-luks1
 create mode 100755 src/luks/tests/pass-tang-luks2

diff --git a/src/luks/clevis-luks-pass b/src/luks/clevis-luks-pass
new file mode 100755
index 0000000..1f59b39
--- /dev/null
+++ b/src/luks/clevis-luks-pass
@@ -0,0 +1,64 @@
+#!/bin/bash -e
+# vim: set ts=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80:
+#
+# Copyright (c) 2019 Red Hat, Inc.
+# Author: Sergio Correia <scorreia@redhat.com> - LUKS2 support.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+. clevis-luks-common-functions
+
+SUMMARY="Returns the LUKS passphrase used for binding a particular slot."
+
+usage() {
+    exec >&2
+    echo "Usage: clevis luks pass -d DEV -s SLT"
+    echo
+    echo "$SUMMARY"
+    echo
+    echo "  -d DEV  The LUKS device to extract the LUKS passphrase used for binding"
+    echo
+    echo "  -s SLOT The slot number to extract the LUKS passphrase"
+    echo
+    exit 1
+}
+
+if [ ${#} -eq 1 ] && [ "${1}" = "--summary" ]; then
+    echo "${SUMMARY}"
+    exit 0
+fi
+
+while getopts ":d:s:" o; do
+    case "$o" in
+    d) DEV=${OPTARG};;
+    s) SLT=${OPTARG};;
+    *) usage;;
+    esac
+done
+
+if [ -z "${DEV}" ]; then
+    echo "Did not specify a device!" >&2
+    usage
+fi
+
+if [ -z "${SLT}" ]; then
+    echo "Did not specify a slot!" >&2
+    usage
+fi
+
+if ! clevis_luks_unlock_device_by_slot "${DEV}" "${SLT}"; then
+    echo "It was not possible to decrypt the passphrase associated to slot ${SLT} in ${DEV}!" >&2
+    exit 1
+fi
diff --git a/src/luks/clevis-luks-pass.1.adoc b/src/luks/clevis-luks-pass.1.adoc
new file mode 100644
index 0000000..fa9526a
--- /dev/null
+++ b/src/luks/clevis-luks-pass.1.adoc
@@ -0,0 +1,43 @@
+CLEVIS-LUKS-PASS(1)
+===================
+:doctype: manpage
+
+
+== NAME
+
+clevis-luks-pass - Extracts the passphrase used for binding a particular slot in a LUKS device
+
+== SYNOPSIS
+
+*clevis luks pass* -d DEV -s SLT
+
+== OVERVIEW
+
+The *clevis luks pass* command extracts the passphrase used for binding a particular slot in a LUKS device.
+For example:
+
+    clevis luks pass -d /dev/sda1 -s 1
+
+== OPTIONS
+
+* *-d* _DEV_ :
+  The LUKS device on which to extract a passphrase from
+
+* *-s* _SLT_ :
+  The slot to use for extracting the passphrase
+
+== EXAMPLE
+
+    clevis luks pass -d /dev/sda1 -s 1
+    <passphrase here>
+
+Note that the output of *clevis luks pass* might be non-printable, in which case it would be better to redirect its output to a file and use it as a key
+file together with cryptsetup. For instance:
+
+    clevis luks pass -d /dev/sda1 -s 1 > slot1-passphrase
+
+And the file slot1-passphrase will contain the passphrase associated with slot #1 in /dev/sda1.
+
+== SEE ALSO
+
+link:clevis-luks-unlock.1.adoc[*clevis-luks-unlock*(1)],
diff --git a/src/luks/meson.build b/src/luks/meson.build
index 12f5a0d..008736e 100644
--- a/src/luks/meson.build
+++ b/src/luks/meson.build
@@ -50,6 +50,9 @@ if libcryptsetup.found() and luksmeta.found() and pwmake.found()
 
   bins += join_paths(meson.current_source_dir(), 'clevis-luks-edit')
   mans += join_paths(meson.current_source_dir(), 'clevis-luks-edit.1')
+
+  bins += join_paths(meson.current_source_dir(), 'clevis-luks-pass')
+  mans += join_paths(meson.current_source_dir(), 'clevis-luks-pass.1')
 else
   warning('Will not install LUKS support due to missing dependencies!')
 endif
diff --git a/src/luks/tests/meson.build b/src/luks/tests/meson.build
index c22a069..f4584aa 100644
--- a/src/luks/tests/meson.build
+++ b/src/luks/tests/meson.build
@@ -84,6 +84,7 @@ if has_tang
   test('report-tang-luks1', find_program('report-tang-luks1'), env: env, timeout: 90)
   test('report-sss-luks1', find_program('report-sss-luks1'), env: env, timeout: 90)
   test('edit-tang-luks1', find_program('edit-tang-luks1'), env: env, timeout: 150)
+  test('pass-tang-luks1', find_program('pass-tang-luks1'), env: env, timeout: 60)
 endif
 
 test('backup-restore-luks1', find_program('backup-restore-luks1'), env: env, timeout: 60)
@@ -111,6 +112,7 @@ if luksmeta_data.get('OLD_CRYPTSETUP') == '0'
     test('report-tang-luks2', find_program('report-tang-luks2'), env: env, timeout: 120)
     test('report-sss-luks2', find_program('report-sss-luks2'), env: env, timeout: 120)
     test('edit-tang-luks2', find_program('edit-tang-luks2'), env: env, timeout: 210)
+    test('pass-tang-luks2', find_program('pass-tang-luks2'), env: env, timeout: 60)
   endif
 
 test('backup-restore-luks2', find_program('backup-restore-luks2'), env: env, timeout: 120)
diff --git a/src/luks/tests/pass-tang-luks1 b/src/luks/tests/pass-tang-luks1
new file mode 100755
index 0000000..0d91e6c
--- /dev/null
+++ b/src/luks/tests/pass-tang-luks1
@@ -0,0 +1,59 @@
+#!/bin/bash -x
+# vim: set tabstop=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80:
+#
+# Copyright (c) 2019 Red Hat, Inc.
+# Author: Sergio Correia <scorreia@redhat.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+TEST="${0}"
+. tests-common-functions
+. clevis-luks-common-functions
+
+function on_exit() {
+    [ ! -d "${TMP}" ] && return 0
+    tang_stop "${TMP}"
+    rm -rf "${TMP}"
+}
+
+trap 'on_exit' EXIT
+
+TMP=$(mktemp -d)
+
+port=$(get_random_port)
+tang_run "${TMP}" "${port}" &
+tang_wait_until_ready "${port}"
+
+url="http://localhost:${port}"
+adv="${TMP}/adv"
+tang_get_adv "${port}" "${adv}"
+
+cfg=$(printf '{"url":"%s","adv":"%s"}' "$url" "$adv")
+
+# LUKS1.
+DEV="${TMP}/luks1-device"
+new_device "luks1" "${DEV}"
+
+if ! clevis luks bind -f -d "${DEV}" tang "${cfg}" <<< "${DEFAULT_PASS}"; then
+    error "${TEST}: Bind should have succeeded."
+fi
+
+# Now let's test the passphrase.
+SLT=1
+PASS=$(clevis luks pass -d "${DEV}" -s "${SLT}")
+echo $PASS >&2
+if ! clevis_luks_check_valid_key_or_keyfile "${DEV}" "${PASS}" "" "${SLT}"; then
+    error "Passphrase obtained from clevis luks pass failed."
+fi
diff --git a/src/luks/tests/pass-tang-luks2 b/src/luks/tests/pass-tang-luks2
new file mode 100755
index 0000000..2d50413
--- /dev/null
+++ b/src/luks/tests/pass-tang-luks2
@@ -0,0 +1,59 @@
+#!/bin/bash -x
+# vim: set tabstop=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80:
+#
+# Copyright (c) 2019 Red Hat, Inc.
+# Author: Sergio Correia <scorreia@redhat.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+TEST="${0}"
+. tests-common-functions
+. clevis-luks-common-functions
+
+function on_exit() {
+    [ ! -d "${TMP}" ] && return 0
+    tang_stop "${TMP}"
+    rm -rf "${TMP}"
+}
+
+trap 'on_exit' EXIT
+
+TMP=$(mktemp -d)
+
+port=$(get_random_port)
+tang_run "${TMP}" "${port}" &
+tang_wait_until_ready "${port}"
+
+url="http://localhost:${port}"
+adv="${TMP}/adv"
+tang_get_adv "${port}" "${adv}"
+
+cfg=$(printf '{"url":"%s","adv":"%s"}' "$url" "$adv")
+
+# LUKS2.
+DEV="${TMP}/luks2-device"
+new_device "luks2" "${DEV}"
+
+if ! clevis luks bind -f -d "${DEV}" tang "${cfg}" <<< "${DEFAULT_PASS}"; then
+    error "${TEST}: Bind should have succeeded."
+fi
+
+# Now let's test the passphrase.
+SLT=1
+PASS=$(clevis luks pass -d "${DEV}" -s "${SLT}")
+echo $PASS >&2
+if ! clevis_luks_check_valid_key_or_keyfile "${DEV}" "${PASS}" "" "${SLT}"; then
+    error "Passphrase obtained from clevis luks pass failed."
+fi
-- 
2.29.2