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#
# Copyright OpenEmbedded Contributors
#
# SPDX-License-Identifier: GPL-2.0-only
#
"""Helper module for GPG signing"""
import bb
import os
import shlex
import subprocess
import tempfile
class LocalSigner(object):
"""Class for handling local (on the build host) signing"""
def __init__(self, d):
self.gpg_bin = d.getVar('GPG_BIN') or \
bb.utils.which(os.getenv('PATH'), 'gpg')
self.gpg_cmd = [self.gpg_bin]
self.gpg_agent_bin = bb.utils.which(os.getenv('PATH'), "gpg-agent")
# Without this we see "Cannot allocate memory" errors when running processes in parallel
# It needs to be set for any gpg command since any agent launched can stick around in memory
# and this parameter must be set.
if self.gpg_agent_bin:
self.gpg_cmd += ["--agent-program=%s|--auto-expand-secmem" % (self.gpg_agent_bin)]
self.gpg_path = d.getVar('GPG_PATH')
self.rpm_bin = bb.utils.which(os.getenv('PATH'), "rpmsign")
self.gpg_version = self.get_gpg_version()
def export_pubkey(self, output_file, keyid, armor=True):
"""Export GPG public key to a file"""
cmd = self.gpg_cmd + ["--no-permission-warning", "--batch", "--yes", "--export", "-o", output_file]
if self.gpg_path:
cmd += ["--homedir", self.gpg_path]
if armor:
cmd += ["--armor"]
cmd += [keyid]
subprocess.check_output(cmd, stderr=subprocess.STDOUT)
def sign_rpms(self, files, keyid, passphrase, digest, sign_chunk, fsk=None, fsk_password=None):
"""Sign RPM files"""
cmd = self.rpm_bin + " --addsign --define '_gpg_name %s' " % keyid
gpg_args = '--no-permission-warning --batch --passphrase=%s --agent-program=%s|--auto-expand-secmem' % (passphrase, self.gpg_agent_bin)
if self.gpg_version > (2,1,):
gpg_args += ' --pinentry-mode=loopback'
cmd += "--define '_gpg_sign_cmd_extra_args %s' " % gpg_args
cmd += "--define '_binary_filedigest_algorithm %s' " % digest
if self.gpg_bin:
cmd += "--define '__gpg %s' " % self.gpg_bin
if self.gpg_path:
cmd += "--define '_gpg_path %s' " % self.gpg_path
if fsk:
cmd += "--signfiles --fskpath %s " % fsk
if fsk_password:
cmd += "--define '_file_signing_key_password %s' " % fsk_password
# Sign in chunks
for i in range(0, len(files), sign_chunk):
subprocess.check_output(shlex.split(cmd + ' '.join(files[i:i+sign_chunk])), stderr=subprocess.STDOUT)
def detach_sign(self, input_file, keyid, passphrase_file, passphrase=None, armor=True, output_suffix=None, use_sha256=False):
"""Create a detached signature of a file"""
if passphrase_file and passphrase:
raise Exception("You should use either passphrase_file of passphrase, not both")
cmd = self.gpg_cmd + ['--detach-sign', '--no-permission-warning', '--batch',
'--no-tty', '--yes', '--passphrase-fd', '0', '-u', keyid]
if self.gpg_path:
cmd += ['--homedir', self.gpg_path]
if armor:
cmd += ['--armor']
if use_sha256:
cmd += ['--digest-algo', "SHA256"]
#gpg > 2.1 supports password pipes only through the loopback interface
#gpg < 2.1 errors out if given unknown parameters
if self.gpg_version > (2,1,):
cmd += ['--pinentry-mode', 'loopback']
try:
if passphrase_file:
with open(passphrase_file) as fobj:
passphrase = fobj.readline();
if not output_suffix:
output_suffix = 'asc' if armor else 'sig'
output_file = input_file + "." + output_suffix
with tempfile.TemporaryDirectory(dir=os.path.dirname(output_file)) as tmp_dir:
tmp_file = os.path.join(tmp_dir, os.path.basename(output_file))
cmd += ['-o', tmp_file]
cmd += [input_file]
job = subprocess.Popen(cmd, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
(_, stderr) = job.communicate(passphrase.encode("utf-8"))
if job.returncode:
bb.fatal("GPG exited with code %d: %s" % (job.returncode, stderr.decode("utf-8")))
os.rename(tmp_file, output_file)
except IOError as e:
bb.error("IO error (%s): %s" % (e.errno, e.strerror))
raise Exception("Failed to sign '%s'" % input_file)
except OSError as e:
bb.error("OS error (%s): %s" % (e.errno, e.strerror))
raise Exception("Failed to sign '%s" % input_file)
def get_gpg_version(self):
"""Return the gpg version as a tuple of ints"""
try:
cmd = self.gpg_cmd + ["--version", "--no-permission-warning"]
ver_str = subprocess.check_output(cmd).split()[2].decode("utf-8")
return tuple([int(i) for i in ver_str.split("-")[0].split('.')])
except subprocess.CalledProcessError as e:
bb.fatal("Could not get gpg version: %s" % e)
def verify(self, sig_file, valid_sigs = ''):
"""Verify signature"""
cmd = self.gpg_cmd + ["--verify", "--no-permission-warning", "--status-fd", "1"]
if self.gpg_path:
cmd += ["--homedir", self.gpg_path]
cmd += [sig_file]
status = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
# Valid if any key matches if unspecified
if not valid_sigs:
ret = False if status.returncode else True
return ret
import re
goodsigs = []
sigre = re.compile(r'^\[GNUPG:\] GOODSIG (\S+)\s(.*)$')
for l in status.stdout.decode("utf-8").splitlines():
s = sigre.match(l)
if s:
goodsigs += [s.group(1)]
for sig in valid_sigs.split():
if sig in goodsigs:
return True
if len(goodsigs):
bb.warn('No accepted signatures found. Good signatures found: %s.' % ' '.join(goodsigs))
return False
def get_signer(d, backend):
"""Get signer object for the specified backend"""
# Use local signing by default
if backend == 'local':
return LocalSigner(d)
else:
bb.fatal("Unsupported signing backend '%s'" % backend)
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