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- #
- # SPDX-License-Identifier: GPL-2.0-only
- #
- """Helper module for GPG signing"""
- import os
- import bb
- import oe.utils
- import subprocess
- import shlex
- 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_path = d.getVar('GPG_PATH')
- self.gpg_version = self.get_gpg_version()
- self.rpm_bin = bb.utils.which(os.getenv('PATH'), "rpmsign")
- self.gpg_agent_bin = bb.utils.which(os.getenv('PATH'), "gpg-agent")
- def export_pubkey(self, output_file, keyid, armor=True):
- """Export GPG public key to a file"""
- cmd = '%s --no-permission-warning --batch --yes --export -o %s ' % \
- (self.gpg_bin, output_file)
- if self.gpg_path:
- cmd += "--homedir %s " % self.gpg_path
- if armor:
- cmd += "--armor "
- cmd += keyid
- subprocess.check_output(shlex.split(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):
- """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_bin, '--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']
- #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']
- if self.gpg_agent_bin:
- cmd += ["--agent-program=%s|--auto-expand-secmem" % (self.gpg_agent_bin)]
- cmd += [input_file]
- try:
- if passphrase_file:
- with open(passphrase_file) as fobj:
- passphrase = fobj.readline();
- job = subprocess.Popen(cmd, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
- (_, stderr) = job.communicate(passphrase.encode("utf-8"))
- if job.returncode:
- raise bb.build.FuncFailed("GPG exited with code %d: %s" %
- (job.returncode, stderr.decode("utf-8")))
- 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:
- ver_str = subprocess.check_output((self.gpg_bin, "--version", "--no-permission-warning")).split()[2].decode("utf-8")
- return tuple([int(i) for i in ver_str.split("-")[0].split('.')])
- except subprocess.CalledProcessError as e:
- raise bb.build.FuncFailed("Could not get gpg version: %s" % e)
- def verify(self, sig_file):
- """Verify signature"""
- cmd = self.gpg_bin + " --verify --no-permission-warning "
- if self.gpg_path:
- cmd += "--homedir %s " % self.gpg_path
- cmd += sig_file
- status = subprocess.call(shlex.split(cmd))
- ret = False if status else True
- return ret
- 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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