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#!/bin/sh
# Copyright (c) 2014-2016 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
# Not technically POSIX-compliant due to use of "local", but almost every
# shell anyone uses today supports it, so its probably fine
DIR=$(dirname "$0")
[ "/${DIR#/}" != "$DIR" ] && DIR=$(dirname "$(pwd)/$0")
echo "Using verify-commits data from ${DIR}"
VERIFIED_ROOT=$(cat "${DIR}/trusted-git-root")
VERIFIED_SHA512_ROOT=$(cat "${DIR}/trusted-sha512-root-commit")
REVSIG_ALLOWED=$(cat "${DIR}/allow-revsig-commits")
HAVE_FAILED=false
IS_SIGNED () {
if [ $1 = $VERIFIED_ROOT ]; then
return 0;
fi
VERIFY_TREE=$2
NO_SHA1=$3
if [ $1 = $VERIFIED_SHA512_ROOT ]; then
if [ "$VERIFY_TREE" = "1" ]; then
echo "All Tree-SHA512s matched up to $VERIFIED_SHA512_ROOT" > /dev/stderr
fi
VERIFY_TREE=0
NO_SHA1=0
fi
if [ "$NO_SHA1" = "1" ]; then
export BITCOIN_VERIFY_COMMITS_ALLOW_SHA1=0
else
export BITCOIN_VERIFY_COMMITS_ALLOW_SHA1=1
fi
if [ "${REVSIG_ALLOWED#*$1}" != "$REVSIG_ALLOWED" ]; then
export BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG=1
else
export BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG=0
fi
if ! git -c "gpg.program=${DIR}/gpg.sh" verify-commit $1 > /dev/null; then
return 1;
fi
# We set $4 to 1 on the first call, always verifying the top of the tree
if [ "$VERIFY_TREE" = 1 -o "$4" = "1" ]; then
IFS_CACHE="$IFS"
IFS='
'
for LINE in $(git ls-tree --full-tree -r $1); do
case "$LINE" in
"12"*)
echo "Repo contains symlinks" > /dev/stderr
IFS="$IFS_CACHE"
return 1
;;
esac
done
IFS="$IFS_CACHE"
FILE_HASHES=""
for FILE in $(git ls-tree --full-tree -r --name-only $1 | LC_ALL=C sort); do
HASH=$(git cat-file blob $1:"$FILE" | sha512sum | { read FIRST OTHER; echo $FIRST; } )
[ "$FILE_HASHES" != "" ] && FILE_HASHES="$FILE_HASHES"'
'
FILE_HASHES="$FILE_HASHES$HASH $FILE"
done
HASH_MATCHES=0
MSG="$(git show -s --format=format:%B $1 | tail -n1)"
case "$MSG -" in
"Tree-SHA512: $(echo "$FILE_HASHES" | sha512sum)")
HASH_MATCHES=1;;
esac
if [ "$HASH_MATCHES" = "0" ]; then
echo "Tree-SHA512 did not match for commit $1" > /dev/stderr
HAVE_FAILED=true
return 1
fi
fi
local PARENTS
PARENTS=$(git show -s --format=format:%P $1)
for PARENT in $PARENTS; do
if IS_SIGNED $PARENT $VERIFY_TREE $NO_SHA1 0; then
return 0;
fi
break
done
if ! "$HAVE_FAILED"; then
echo "No parent of $1 was signed with a trusted key!" > /dev/stderr
echo "Parents are:" > /dev/stderr
for PARENT in $PARENTS; do
git show -s $PARENT > /dev/stderr
done
HAVE_FAILED=true
fi
return 1;
}
if [ x"$1" = "x" ]; then
TEST_COMMIT="HEAD"
else
TEST_COMMIT="$1"
fi
DO_CHECKOUT_TEST=0
if [ x"$2" = "x--tree-checks" ]; then
DO_CHECKOUT_TEST=1
fi
IS_SIGNED "$TEST_COMMIT" "$DO_CHECKOUT_TEST" 1 1
RES=$?
if [ "$RES" = 1 ]; then
if ! "$HAVE_FAILED"; then
echo "$TEST_COMMIT was not signed with a trusted key!"
fi
else
echo "There is a valid path from $TEST_COMMIT to $VERIFIED_ROOT where all commits are signed!"
fi
exit $RES
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