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#!/bin/sh
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
#
# $Id: reject-detected-sha1-collisions.sh 1794454 2017-05-08 20:34:56Z astieger $
#
# Prevents detected SHA-1 collisions from being committed.
# Uses sha1dcsum of sha1collisiondetection to detect
# crytoanalytic collision attacks against SHA-1. The
# detection works on a single side of the collision.
# https://github.com/cr-marcstevens/sha1collisiondetection
# commit 5ee29e5 or later
REPOS="$1"
TXN="$2"
SVNLOOK=/usr/bin/svnlook
GREP=/usr/bin/grep
SED=/usr/bin/sed
HEAD=/usr/bin/head
SHA1DCSUM=/usr/bin/sha1dcsum
$SVNLOOK changed -t "$TXN" "$REPOS"
if [ $? -ne 0 ]; then
echo "svnlook failed, possible SHA-1 collision" >&2
exit 2
fi
$SVNLOOK changed -t "$TXN" "$REPOS" | $GREP -Ev '^D ' | $SED -e 's/^. //' | $GREP -v '/$' | while IFS= read -r FILE; do
$SVNLOOK cat -t "$TXN" "$REPOS" "$FILE" | $SHA1DCSUM - | $GREP -qv " \*coll\* "
if [ $? -ne 0 ]; then
echo "detected SHA-1 collision rejected" >&2
exit 3
fi
done