Chun Kuan Lee
7 years ago
parent
e24bf1ce18
commit
e5b2cd8e75
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f8feaa4636260b599294c7285bcf1c8b7737f74e
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8040ae6fc576e9504186f2ae3ff2c8125de1095c
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6052d509105790a26b3ad5df43dd61e7f1b24a12
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3798e5de334c3deb5f71302b782f6b8fbd5087f1
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326ffed09bfcc209a2efd6a2ebc69edf6bd200b5
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97d83739db0631be5d4ba86af3616014652c00ec
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#!/usr/bin/env python3
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# Copyright (c) 2018 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Verify commits against a trusted keys list."""
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import argparse
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import hashlib
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import os
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import subprocess
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import sys
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import time
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GIT = os.getenv('GIT', 'git')
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def tree_sha512sum(commit='HEAD'):
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"""Calculate the Tree-sha512 for the commit.
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This is copied from github-merge.py."""
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# request metadata for entire tree, recursively
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files = []
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blob_by_name = {}
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for line in subprocess.check_output([GIT, 'ls-tree', '--full-tree', '-r', commit]).splitlines():
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name_sep = line.index(b'\t')
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metadata = line[:name_sep].split() # perms, 'blob', blobid
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assert metadata[1] == b'blob'
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name = line[name_sep + 1:]
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files.append(name)
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blob_by_name[name] = metadata[2]
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files.sort()
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# open connection to git-cat-file in batch mode to request data for all blobs
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# this is much faster than launching it per file
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p = subprocess.Popen([GIT, 'cat-file', '--batch'], stdout=subprocess.PIPE, stdin=subprocess.PIPE)
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overall = hashlib.sha512()
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for f in files:
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blob = blob_by_name[f]
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# request blob
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p.stdin.write(blob + b'\n')
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p.stdin.flush()
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# read header: blob, "blob", size
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reply = p.stdout.readline().split()
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assert reply[0] == blob and reply[1] == b'blob'
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size = int(reply[2])
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# hash the blob data
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intern = hashlib.sha512()
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ptr = 0
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while ptr < size:
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bs = min(65536, size - ptr)
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piece = p.stdout.read(bs)
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if len(piece) == bs:
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intern.update(piece)
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else:
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raise IOError('Premature EOF reading git cat-file output')
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ptr += bs
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dig = intern.hexdigest()
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assert p.stdout.read(1) == b'\n' # ignore LF that follows blob data
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# update overall hash with file hash
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overall.update(dig.encode("utf-8"))
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overall.update(" ".encode("utf-8"))
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overall.update(f)
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overall.update("\n".encode("utf-8"))
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p.stdin.close()
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if p.wait():
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raise IOError('Non-zero return value executing git cat-file')
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return overall.hexdigest()
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def main():
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# Parse arguments
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parser = argparse.ArgumentParser(usage='%(prog)s [options] [commit id]')
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parser.add_argument('--disable-tree-check', action='store_false', dest='verify_tree', help='disable SHA-512 tree check')
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parser.add_argument('--clean-merge', type=float, dest='clean_merge', default=float('inf'), help='Only check clean merge after <NUMBER> days ago (default: %(default)s)', metavar='NUMBER')
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parser.add_argument('commit', nargs='?', default='HEAD', help='Check clean merge up to commit <commit>')
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args = parser.parse_args()
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# get directory of this program and read data files
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dirname = os.path.dirname(os.path.abspath(__file__))
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print("Using verify-commits data from " + dirname)
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verified_root = open(dirname + "/trusted-git-root", "r").read().splitlines()[0]
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verified_sha512_root = open(dirname + "/trusted-sha512-root-commit", "r").read().splitlines()[0]
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revsig_allowed = open(dirname + "/allow-revsig-commits", "r").read().splitlines()
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unclean_merge_allowed = open(dirname + "/allow-unclean-merge-commits", "r").read().splitlines()
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incorrect_sha512_allowed = open(dirname + "/allow-incorrect-sha512-commits", "r").read().splitlines()
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# Set commit and branch and set variables
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current_commit = args.commit
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if ' ' in current_commit:
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print("Commit must not contain spaces", file=sys.stderr)
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sys.exit(1)
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verify_tree = args.verify_tree
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no_sha1 = True
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prev_commit = ""
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initial_commit = current_commit
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branch = subprocess.check_output([GIT, 'show', '-s', '--format=%H', initial_commit], universal_newlines=True).splitlines()[0]
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# Iterate through commits
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while True:
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if current_commit == verified_root:
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print('There is a valid path from "{}" to {} where all commits are signed!'.format(initial_commit, verified_root))
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sys.exit(0)
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if current_commit == verified_sha512_root:
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if verify_tree:
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print("All Tree-SHA512s matched up to {}".format(verified_sha512_root), file=sys.stderr)
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verify_tree = False
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no_sha1 = False
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os.environ['BITCOIN_VERIFY_COMMITS_ALLOW_SHA1'] = "0" if no_sha1 else "1"
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os.environ['BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG'] = "1" if current_commit in revsig_allowed else "0"
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# Check that the commit (and parents) was signed with a trusted key
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if subprocess.call([GIT, '-c', 'gpg.program={}/gpg.sh'.format(dirname), 'verify-commit', current_commit], stdout=subprocess.DEVNULL):
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if prev_commit != "":
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print("No parent of {} was signed with a trusted key!".format(prev_commit), file=sys.stderr)
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print("Parents are:", file=sys.stderr)
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parents = subprocess.check_output([GIT, 'show', '-s', '--format=format:%P', prev_commit], universal_newlines=True).splitlines()[0].split(' ')
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for parent in parents:
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subprocess.call([GIT, 'show', '-s', parent], stdout=sys.stderr)
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else:
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print("{} was not signed with a trusted key!".format(current_commit), file=sys.stderr)
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sys.exit(1)
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# Check the Tree-SHA512
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if (verify_tree or prev_commit == "") and current_commit not in incorrect_sha512_allowed:
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tree_hash = tree_sha512sum(current_commit)
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if ("Tree-SHA512: {}".format(tree_hash)) not in subprocess.check_output([GIT, 'show', '-s', '--format=format:%B', current_commit], universal_newlines=True).splitlines():
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print("Tree-SHA512 did not match for commit " + current_commit, file=sys.stderr)
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sys.exit(1)
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# Merge commits should only have two parents
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parents = subprocess.check_output([GIT, 'show', '-s', '--format=format:%P', current_commit], universal_newlines=True).splitlines()[0].split(' ')
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if len(parents) > 2:
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print("Commit {} is an octopus merge".format(current_commit), file=sys.stderr)
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sys.exit(1)
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# Check that the merge commit is clean
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commit_time = int(subprocess.check_output([GIT, 'show', '-s', '--format=format:%ct', current_commit], universal_newlines=True).splitlines()[0])
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check_merge = commit_time > time.time() - args.clean_merge * 24 * 60 * 60 # Only check commits in clean_merge days
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allow_unclean = current_commit in unclean_merge_allowed
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if len(parents) == 2 and check_merge and not allow_unclean:
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current_tree = subprocess.check_output([GIT, 'show', '--format=%T', current_commit], universal_newlines=True).splitlines()[0]
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subprocess.call([GIT, 'checkout', '--force', '--quiet', parents[0]])
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subprocess.call([GIT, 'merge', '--no-ff', '--quiet', parents[1]], stdout=subprocess.DEVNULL)
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recreated_tree = subprocess.check_output([GIT, 'show', '--format=format:%T', 'HEAD'], universal_newlines=True).splitlines()[0]
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if current_tree != recreated_tree:
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print("Merge commit {} is not clean".format(current_commit), file=sys.stderr)
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subprocess.call([GIT, 'diff', current_commit])
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subprocess.call([GIT, 'checkout', '--force', '--quiet', branch])
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sys.exit(1)
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subprocess.call([GIT, 'checkout', '--force', '--quiet', branch])
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prev_commit = current_commit
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current_commit = parents[0]
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if __name__ == '__main__':
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main()
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@ -1,153 +0,0 @@
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#!/bin/sh
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# Copyright (c) 2014-2016 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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DIR=$(dirname "$0")
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[ "/${DIR#/}" != "$DIR" ] && DIR=$(dirname "$(pwd)/$0")
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echo "Using verify-commits data from ${DIR}"
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VERIFIED_ROOT=$(cat "${DIR}/trusted-git-root")
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VERIFIED_SHA512_ROOT=$(cat "${DIR}/trusted-sha512-root-commit")
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REVSIG_ALLOWED=$(cat "${DIR}/allow-revsig-commits")
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HAVE_GNU_SHA512=1
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[ ! -x "$(which sha512sum)" ] && HAVE_GNU_SHA512=0
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if [ x"$1" = "x" ]; then
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CURRENT_COMMIT="HEAD"
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else
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CURRENT_COMMIT="$1"
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fi
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if [ "${CURRENT_COMMIT#* }" != "$CURRENT_COMMIT" ]; then
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echo "Commit must not contain spaces?" > /dev/stderr
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exit 1
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fi
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VERIFY_TREE=0
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if [ x"$2" = "x--tree-checks" ]; then
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VERIFY_TREE=1
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fi
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NO_SHA1=1
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PREV_COMMIT=""
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INITIAL_COMMIT="${CURRENT_COMMIT}"
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BRANCH="$(git rev-parse --abbrev-ref HEAD)"
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while true; do
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if [ "$CURRENT_COMMIT" = $VERIFIED_ROOT ]; then
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echo "There is a valid path from \"$INITIAL_COMMIT\" to $VERIFIED_ROOT where all commits are signed!"
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exit 0
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fi
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if [ "$CURRENT_COMMIT" = $VERIFIED_SHA512_ROOT ]; then
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if [ "$VERIFY_TREE" = "1" ]; then
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echo "All Tree-SHA512s matched up to $VERIFIED_SHA512_ROOT" > /dev/stderr
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fi
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VERIFY_TREE=0
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NO_SHA1=0
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fi
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if [ "$NO_SHA1" = "1" ]; then
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export BITCOIN_VERIFY_COMMITS_ALLOW_SHA1=0
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else
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export BITCOIN_VERIFY_COMMITS_ALLOW_SHA1=1
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fi
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if [ "${REVSIG_ALLOWED#*$CURRENT_COMMIT}" != "$REVSIG_ALLOWED" ]; then
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export BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG=1
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else
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export BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG=0
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fi
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if ! git -c "gpg.program=${DIR}/gpg.sh" verify-commit "$CURRENT_COMMIT" > /dev/null; then
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if [ "$PREV_COMMIT" != "" ]; then
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echo "No parent of $PREV_COMMIT was signed with a trusted key!" > /dev/stderr
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echo "Parents are:" > /dev/stderr
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PARENTS=$(git show -s --format=format:%P $PREV_COMMIT)
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for PARENT in $PARENTS; do
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git show -s $PARENT > /dev/stderr
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done
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else
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echo "$CURRENT_COMMIT was not signed with a trusted key!" > /dev/stderr
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fi
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exit 1
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fi
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# We always verify the top of the tree
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if [ "$VERIFY_TREE" = 1 -o "$PREV_COMMIT" = "" ]; then
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IFS_CACHE="$IFS"
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IFS='
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'
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for LINE in $(git ls-tree --full-tree -r "$CURRENT_COMMIT"); do
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case "$LINE" in
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"12"*)
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echo "Repo contains symlinks" > /dev/stderr
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IFS="$IFS_CACHE"
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exit 1
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;;
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esac
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done
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IFS="$IFS_CACHE"
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FILE_HASHES=""
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for FILE in $(git ls-tree --full-tree -r --name-only "$CURRENT_COMMIT" | LC_ALL=C sort); do
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if [ "$HAVE_GNU_SHA512" = 1 ]; then
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HASH=$(git cat-file blob "$CURRENT_COMMIT":"$FILE" | sha512sum | { read FIRST _; echo $FIRST; } )
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else
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HASH=$(git cat-file blob "$CURRENT_COMMIT":"$FILE" | shasum -a 512 | { read FIRST _; echo $FIRST; } )
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fi
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[ "$FILE_HASHES" != "" ] && FILE_HASHES="$FILE_HASHES"'
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'
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FILE_HASHES="$FILE_HASHES$HASH $FILE"
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done
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if [ "$HAVE_GNU_SHA512" = 1 ]; then
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TREE_HASH="$(echo "$FILE_HASHES" | sha512sum)"
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else
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TREE_HASH="$(echo "$FILE_HASHES" | shasum -a 512)"
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fi
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HASH_MATCHES=0
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MSG="$(git show -s --format=format:%B "$CURRENT_COMMIT" | tail -n1)"
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case "$MSG -" in
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"Tree-SHA512: $TREE_HASH")
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HASH_MATCHES=1;;
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esac
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if [ "$HASH_MATCHES" = "0" ]; then
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echo "Tree-SHA512 did not match for commit $CURRENT_COMMIT" > /dev/stderr
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exit 1
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fi
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fi
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PARENTS=$(git show -s --format=format:%P "$CURRENT_COMMIT")
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PARENT1=${PARENTS%% *}
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PARENT2=""
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if [ "x$PARENT1" != "x$PARENTS" ]; then
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PARENTX=${PARENTS#* }
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PARENT2=${PARENTX%% *}
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if [ "x$PARENT2" != "x$PARENTX" ]; then
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echo "Commit $CURRENT_COMMIT is an octopus merge" > /dev/stderr
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exit 1
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fi
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fi
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if [ "x$PARENT2" != "x" ]; then
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CURRENT_TREE="$(git show --format="%T" "$CURRENT_COMMIT")"
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git checkout --force --quiet "$PARENT1"
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git merge --no-ff --quiet "$PARENT2" >/dev/null
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RECREATED_TREE="$(git show --format="%T" HEAD)"
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if [ "$CURRENT_TREE" != "$RECREATED_TREE" ]; then
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echo "Merge commit $CURRENT_COMMIT is not clean" > /dev/stderr
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git diff "$CURRENT_COMMIT"
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git checkout --force --quiet "$BRANCH"
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exit 1
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fi
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git checkout --force --quiet "$BRANCH"
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fi
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PREV_COMMIT="$CURRENT_COMMIT"
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CURRENT_COMMIT="$PARENT1"
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done
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