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166 lines
8.0 KiB
166 lines
8.0 KiB
3 years ago
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#!/usr/bin/env python3
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# Copyright (c) 2018-2019 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 logging
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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. See https://github.com/bitcoin-core/bitcoin-maintainer-tools."""
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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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# Enable debug logging if running in CI
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if 'CI' in os.environ and os.environ['CI'].lower() == "true":
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logging.getLogger().setLevel(logging.DEBUG)
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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", encoding="utf8").read().splitlines()[0]
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verified_sha512_root = open(dirname + "/trusted-sha512-root-commit", "r", encoding="utf8").read().splitlines()[0]
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revsig_allowed = open(dirname + "/allow-revsig-commits", "r", encoding="utf-8").read().splitlines()
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unclean_merge_allowed = open(dirname + "/allow-unclean-merge-commits", "r", encoding="utf-8").read().splitlines()
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incorrect_sha512_allowed = open(dirname + "/allow-incorrect-sha512-commits", "r", encoding="utf-8").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]).decode('utf8').splitlines()[0]
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# Iterate through commits
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while True:
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# Log a message to prevent Travis from timing out
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logging.debug("verify-commits: [in-progress] processing commit {}".format(current_commit[:8]))
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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]).decode('utf8').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]).decode('utf8').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]).decode('utf8').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]).decode('utf8').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]).decode('utf8').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', '--no-gpg-sign', parents[1]], stdout=subprocess.DEVNULL)
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recreated_tree = subprocess.check_output([GIT, 'show', '--format=format:%T', 'HEAD']).decode('utf8').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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