tools/hook-scripts/reject-known-sha1-collisions.sh

#!/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.
#
#
# $Id$
#
# Prevents some SHA-1 collisions to be commited
# Test fo the 320 byte prefix found on https://shattered.io/
# If the files are committed in the same transaction, svnlook
# will error out itself due to the apparent corruption in the
# candidate revision

REPOS="$1"
TXN="$2"
SVNLOOK=/usr/bin/svnlook

$SVNLOOK changed -t "$TXN" "$REPOS"
if [ $? -ne 0 ]; then
  echo $FILES >&2
  echo "svnlook failed, possible SHA-1 collision" >&2
  exit 2
fi

FILES=`$SVNLOOK changed -t "$TXN" "$REPOS" | /usr/bin/grep -Ev '^D ' | /usr/bin/awk '{print $2}'`
for FILE in $FILES; do
  PREFIX=`$SVNLOOK cat -t "$TXN" "$REPOS" "$FILE" | head -c320 | /usr/bin/sha1sum | cut -c-40`
  if [ "$PREFIX" == 'f92d74e3874587aaf443d1db961d4e26dde13e9c' ]; then
        echo "known SHA-1 collision rejected" >&2
        exit 3
  fi
done
1	#!/bin/sh
2	#
3	# Licensed to the Apache Software Foundation (ASF) under one
4	# or more contributor license agreements. See the NOTICE file
5	# distributed with this work for additional information
6	# regarding copyright ownership. The ASF licenses this file
7	# to you under the Apache License, Version 2.0 (the
8	# "License"); you may not use this file except in compliance
9	# with the License. You may obtain a copy of the License at
10	#
11	# http://www.apache.org/licenses/LICENSE-2.0
12	#
13	# Unless required by applicable law or agreed to in writing,
14	# software distributed under the License is distributed on an
15	# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16	# KIND, either express or implied. See the License for the
17	# specific language governing permissions and limitations
18	# under the License.
19	#
20	#
21	# $Id$
22	#
23	# Prevents some SHA-1 collisions to be commited
24	# Test fo the 320 byte prefix found on https://shattered.io/
25	# If the files are committed in the same transaction, svnlook
26	# will error out itself due to the apparent corruption in the
27	# candidate revision
28
29	REPOS="$1"
30	TXN="$2"
31	SVNLOOK=/usr/bin/svnlook
32
33	$SVNLOOK changed -t "$TXN" "$REPOS"
34	if [ $? -ne 0 ]; then
35	echo $FILES >&2
36	echo "svnlook failed, possible SHA-1 collision" >&2
37	exit 2
38	fi
39
40	FILES=`$SVNLOOK changed -t "$TXN" "$REPOS" \| /usr/bin/grep -Ev '^D ' \| /usr/bin/awk '{print $2}'`
41	for FILE in $FILES; do
42	PREFIX=`$SVNLOOK cat -t "$TXN" "$REPOS" "$FILE" \| head -c320 \| /usr/bin/sha1sum \| cut -c-40`
43	if [ "$PREFIX" == 'f92d74e3874587aaf443d1db961d4e26dde13e9c' ]; then
44	echo "known SHA-1 collision rejected" >&2
45	exit 3
46	fi
47	done
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