tests: add test for commits sign/verification

Add tests checking:
- sign mechanism is in working state
- module 'dummy' is able to sign/verify commit
- module 'ed25519' is able to sign/verify commit
- both modules could be used for the same commit
- 'ostree sign' builtin works with commits
- 'ostree commit' builtin able to sign commits

Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>

Makefile-tests.am

@@ -137,6 +137,7 @@ _installed_or_uninstalled_test_scripts = \
 	tests/test-summary-collections.sh \
 	tests/test-pull-collections.sh \
 	tests/test-config.sh \
+	tests/test-signed-commit.sh \
 	$(NULL)
 
 if USE_GPGME

tests/libtest.sh

@@ -673,6 +673,16 @@ which_gpg () {
     echo ${gpg}
 }
 
+has_libsodium () {
+    local ret
+    ${CMD_PREFIX} ostree --version > version.txt
+    grep -q -e '- libsodium' version.txt
+    ret=$?
+    rm -f version.txt
+    return ${ret}
+}
+
+
 libtest_cleanup_gpg () {
     local gpg_homedir=${1:-${test_tmpdir}/gpghome}
     gpg-connect-agent --homedir "${gpg_homedir}" killagent /bye || true

tests/test-signed-commit.sh

@@ -0,0 +1,106 @@
+#!/bin/bash
+#
+# Copyright (C) 2019 Collabora Ltd.
+#
+# SPDX-License-Identifier: LGPL-2.0+
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+set -euo pipefail
+
+. $(dirname $0)/libtest.sh
+
+echo "1..6"
+
+mkdir ${test_tmpdir}/repo
+ostree_repo_init repo --mode="archive"
+
+echo "Unsigned commit" > file.txt
+${CMD_PREFIX} ostree --repo=${test_tmpdir}/repo commit -b main -s 'Unsigned commit'
+COMMIT="$(ostree --repo=${test_tmpdir}/repo rev-parse main)"
+
+# Test `ostree sign` with dummy module first
+DUMMYSIGN="dummysign"
+${CMD_PREFIX} ostree --repo=${test_tmpdir}/repo sign --sign-type=dummy ${COMMIT} ${DUMMYSIGN}
+
+# Ensure that detached metadata really contain expected string
+EXPECTEDSIGN="$(echo $DUMMYSIGN | hexdump -n 9 -e '8/1 "0x%.2x, " 1/1 " 0x%.2x"')"
+${CMD_PREFIX} ostree --repo=repo show ${COMMIT} --print-detached-metadata-key=ostree.sign.dummy | grep -q -e "${EXPECTEDSIGN}"
+echo "ok Detached dummy signature added"
+
+# Verify vith sign mechanism
+${CMD_PREFIX} ostree  --repo=${test_tmpdir}/repo sign --sign-type=dummy --verify ${COMMIT} ${DUMMYSIGN}
+echo "ok dummy signature verified"
+
+echo "Signed commit with dummy key: ${DUMMYSIGN}" >> file.txt
+${CMD_PREFIX} ostree --repo=${test_tmpdir}/repo commit -b main -s 'Signed with dummy module' --sign=${DUMMYSIGN} --sign-type=dummy 
+COMMIT="$(ostree --repo=${test_tmpdir}/repo rev-parse main)"
+${CMD_PREFIX} ostree --repo=${test_tmpdir}/repo sign --sign-type=dummy --verify ${COMMIT} ${DUMMYSIGN}
+echo "ok commit with dummy signing"
+
+# Test ostree sign with 'ed25519' module
+# Generate private key in PEM format
+PEMFILE="$(mktemp -p ${test_tmpdir} ed25519_XXXXXX.pem)"
+openssl genpkey -algorithm ed25519 -outform PEM -out "${PEMFILE}"
+
+# tests below require libsodium support
+if has_libsodium; then
+    # Based on: http://openssl.6102.n7.nabble.com/ed25519-key-generation-td73907.html
+    # Extract the private and public parts from generated key.
+    PUBLIC="$(openssl pkey -outform DER -pubout -in ${PEMFILE} | hexdump -s 12 -e '16/1 "%.2x"')"
+    SEED="$(openssl pkey -outform DER -in ${PEMFILE} | hexdump -s 16 -e '16/1 "%.2x"')"
+    # Secret key is concantination of SEED and PUBLIC
+    SECRET="${SEED}${PUBLIC}"
+
+    echo "SEED = $SEED"
+    echo "PUBLIC = $PUBLIC"
+
+    echo "Signed commit with ed25519: ${SECRET}" >> file.txt
+    ${CMD_PREFIX} ostree --repo=${test_tmpdir}/repo commit -b main -s "Signed with ed25519 module" --sign=${SECRET} --sign-type=ed25519  
+    COMMIT="$(ostree --repo=${test_tmpdir}/repo rev-parse main)"
+
+    # Ensure that detached metadata contain signature
+    ${CMD_PREFIX} ostree --repo=repo show ${COMMIT} --print-detached-metadata-key=ostree.sign.ed25519 &>/dev/null
+    echo "ok Detached ed25519 signature added"
+
+    # Verify vith sign mechanism
+    ${CMD_PREFIX} ostree  --repo=${test_tmpdir}/repo sign --verify --sign-type=ed25519 ${COMMIT} ${PUBLIC}
+    echo "ok ed25519 signature verified"
+
+    # Check if we able to use all available modules to sign the same commit
+    echo "Unsigned commit for multi-sign" >> file.txt
+    ${CMD_PREFIX} ostree --repo=${test_tmpdir}/repo commit -b main -s 'Unsigned commit'
+    COMMIT="$(ostree --repo=${test_tmpdir}/repo rev-parse main)"
+    # Check if we have no signatures
+    for mod in "dummy" "ed25519"; do
+        if ostree --repo=repo show ${COMMIT} --print-detached-metadata-key=ostree.sign.${mod}; then
+            echo "Unexpected signature for ${mod} found"
+            exit 1
+        fi
+    done
+
+    # Sign with all available modules
+    ${CMD_PREFIX} ostree --repo=${test_tmpdir}/repo sign --sign-type=dummy ${COMMIT} ${DUMMYSIGN}
+    ${CMD_PREFIX} ostree --repo=${test_tmpdir}/repo sign --sign-type=ed25519 ${COMMIT} ${SECRET}
+    # and verify
+    ${CMD_PREFIX} ostree --repo=${test_tmpdir}/repo sign --verify --sign-type=ed25519 ${COMMIT} ${PUBLIC}
+    ${CMD_PREFIX} ostree --repo=${test_tmpdir}/repo sign --sign-type=dummy --verify ${COMMIT} ${DUMMYSIGN}
+    echo "ok multiple signing "
+else
+    echo "ok Detached ed25519 signature # SKIP due libsodium unavailability"
+    echo "ok ed25519 signature verified # SKIP due libsodium unavailability"
+    echo "ok multiple signing # SKIP due libsodium unavailability"
+fi