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# koji-plugin-sign
Koji plugin for automated package signing; internally used by the OSG Software Team.
This provides a koji-hub preImport plugin that makes a callout to rpmsign(8) to sign the built RPMs before importing them into Koji.
The key IDs and passphrases can be configured via a Python ConfigParser-style config file.
pexpect is used to type in the passphrase or PIN.
This was originally taken from https://fedorahosted.org/koji/ticket/203 but that URL is gone.
The original license is unknown.

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# Koji callback for writing signed rpms after signing via sign.py
# Required for package generation with strict keys in mash
from koji.plugin import register_callback
import kojihub
import logging
from configparser import ConfigParser
# Configuration file in /etc like for other plugins
config_file = '/etc/koji-hub/plugins/sign.conf'
logger = logging.getLogger('koji.plugin.post_sign')
def validate_args(sigkey, sighash, build, rpm):
missing_args = []
if sigkey is None:
missing_args.append('sigkey')
if sighash is None:
missing_args.append('sighash')
if build is None:
missing_args.append('build')
if rpm is None:
missing_args.append('rpm')
if rpm is not None and 'buildroot_id' not in rpm:
missing_args.append('rpm.buildroot_id')
if build is not None and 'nvr' not in build:
missing_args.append('build.nvr')
if any(missing_args):
logger.warning(f"Required arguments {missing_args} missing in post_sign plugin. Skipping")
return False
return True
def post_sign(cbType, sigkey=None, sighash=None, build=None, rpm=None):
""" Run the kojihub write-signed-rpm command on rpms after they've been signed with a signing key,
which is required for generating repos that use a specific key.
"""
if not validate_args(sigkey, sighash, build, rpm):
return
buildroot = kojihub.get_buildroot(rpm['buildroot_id'])
if buildroot is None or 'tag_name' not in buildroot:
logger.warning("No tag name found for build. Skipping")
return
tag_name = buildroot['tag_name']
logger.info("Running post-sign plugin for build %s with tag_name %s", build['nvr'], tag_name)
config = ConfigParser()
config.read(config_file)
if not config.has_option(tag_name, "strict_keys") or not config.getboolean(tag_name, "strict_keys"):
# Only need to write-signed-rpm for repos with strict signing enabled
logger.info("tag_name %s doesn't have strict signing enabled. Skipping.", tag_name)
return
kojihub.write_signed_rpm(rpm, sigkey)
logging.getLogger('koji.plugin.sign').info("write-signed-rpm task run successfully.")
register_callback('postRPMSign', post_sign)

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plugins/koji-plugin-sign/rpm/koji-plugin-sign.spec Normal file
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Name: koji-plugin-sign
Version: 1.4.0
Release: 15%{?dist}
Summary: GPG signing plugin for koji-hub
Group: Applications/System
License: Apache 2.0
URL: https://github.com/osg-htc/koji-plugin-sign
Source: %{name}-%{version}.tar.gz
BuildArch: noarch
BuildRequires: koji-hub
Requires: koji-hub
%if 0%{?el7}
BuildRequires: pexpect
Requires: pexpect
%else
BuildRequires: python3-pexpect
Requires: python3-pexpect
%endif
Requires: /usr/bin/rpmsign
%description
GPG signing plugin for koji-hub
%prep
%autosetup -p1
%build
exit 0
%install
mkdir -p $RPM_BUILD_ROOT
install -D sign.conf -m 0600 $RPM_BUILD_ROOT/etc/koji-hub/plugins/sign.conf
install -D sign.py -m 0755 $RPM_BUILD_ROOT/usr/lib/koji-hub-plugins/sign.py
install -D post_sign.py -m 0755 $RPM_BUILD_ROOT/usr/lib/koji-hub-plugins/post_sign.py
%files
%config(noreplace) %attr(0600,apache,apache) /etc/koji-hub/plugins/sign.conf
%attr(0755,root,root) /usr/lib/koji-hub-plugins/sign.py*
%attr(0755,root,root) /usr/lib/koji-hub-plugins/post_sign.py*
%changelog
* Fri Oct 27 2023 Matt Westphall <westphall@wisc.edu> - 1.4.0-15
- Add callback to run koji write-signed-rpm after signing
* Mon Oct 16 2023 Matt Westphall <westphall@wisc.edu> - 1.4.0-14
- Re-add more robust error checking for new prompts
* Fri Oct 13 2023 Matt Westphall <westphall@wisc.edu> - 1.4.0-13
- Update pexpect prompt check for yubikey with pinentry-mode loopback
* Fri Oct 13 2023 Mátyás Selmeci <matyas@cs.wisc.edu> - 1.4.0-12
- First build from GitHub sources
* Fri Dec 30 2022 Carl Edquist <edquist@cs.wisc.edu> - 1.4.0-10
- Bump and rebuild for new gpg key (SOFTWARE-5422)
* Wed Dec 28 2022 Mátyás Selmeci <matyas@cs.wisc.edu> - 1.4.0-9
- Patch to add gpg_digest_algo option (SOFTWARE-5425)
- Patches to improve error detection (SOFTWARE-5410)
- Patch for Python 3 compat
* Wed Apr 22 2020 Mátyás Selmeci <matyas@cs.wisc.edu> - 1.4.0-8
- Add /usr/bin/rpmsign dependency
* Thu Oct 17 2013 Matyas Selmeci <matyas@cs.wisc.edu> - 1.4.0-7
- Rebuild with dist tag
* Thu Sep 22 2011 Matyas Selmeci <matyas@cs.wisc.edu> - 1.4.0-6
- fixed disabling not working with previous patch
* Thu Sep 22 2011 Matyas Selmeci <matyas@cs.wisc.edu> - 1.4.0-5
- added patch to allow enabling/disabling signing for a tag (or by default)
* Thu Sep 15 2011 Matyas Selmeci <matyas@cs.wisc.edu> - 1.4.0-4
- added pexpect dependency
* Thu Sep 15 2011 Matyas Selmeci <matyas@cs.wisc.edu> 1.4.0-3
- Set package to be noarch
- sign.py moved to /usr/lib/koji-hub-plugins to match what the package koji-hub-plugins is doing
* Fri Aug 5 2011 Matyas Selmeci <matyas@cs.wisc.edu> 1.4.0-1
- Created

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# /etc/koji-sign-plugin/sign.conf
# This file and the gpg_path should be readable by the apache user only
[DEFAULT]
rpm = /bin/rpm
gpgbin = /usr/bin/gpg
gpg_path = /etc/koji-sign-plugin/gnupg
gpg_name = My Company, Inc. <support@mycompany.com>
gpg_pass = my_passphrase
enabled = 1
# Defaults can be overridden on a per tag basis
[dist-foo-build]
gpg_name = My Other Company, Inc. <support@myothercompany.com>
gpg_pass = my_other_passphrase

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# Koji callback for GPG signing RPMs before import
# Consider sigul for a more robust solution -- https://fedorahosted.org/sigul/
#
# Author:
# Paul B Schroeder <paulbsch "at" vbridges "dot" com>
from koji.plugin import register_callback
from tempfile import TemporaryFile
import logging
import os
import pexpect
import re
from configparser import ConfigParser, NoOptionError
# Get the tag name from the buildroot map
import sys
sys.path.insert(0, '/usr/share/koji-hub')
from kojihub import get_buildroot
# Configuration file in /etc like for other plugins
config_file = '/etc/koji-hub/plugins/sign.conf'
GPG_EXPECTS = ['Enter passphrase:', pexpect.EOF, 'failed', 'skipping', 'error', pexpect.TIMEOUT]
ERROR_MESSAGES = {
2: 'Package signing failed!',
3: 'Package signing skipped!',
4: 'Package signing error!',
5: 'Package signing timed out!'
}
def sign(cbtype, *args, **kws):
if kws['type'] != 'build':
return
br_id = list(kws['brmap'].values())[0]
br = get_buildroot(br_id)
tag_name = br['tag_name']
logging.getLogger('koji.plugin.sign').info("Got package with tag_name %s", tag_name)
config = ConfigParser()
config.read(config_file)
if not config.has_section(tag_name):
tag_name = "DEFAULT"
rpm = config.get(tag_name, 'rpm')
gpgbin = config.get(tag_name, 'gpgbin')
gpg_path = config.get(tag_name, 'gpg_path')
gpg_name = config.get(tag_name, 'gpg_name')
gpg_pass = config.get(tag_name, 'gpg_pass')
try:
gpg_digest_algo = config.get(tag_name, 'gpg_digest_algo')
except NoOptionError:
gpg_digest_algo = None
try:
enabled = config.getboolean(tag_name, 'enabled')
except NoOptionError:
# Note that signing is _enabled_ by default
enabled = True
if not enabled:
logging.getLogger('koji.plugin.sign').info('Signing not enabled for this tag.')
return
# Get the package paths set up
from koji import pathinfo
uploadpath = pathinfo.work()
rpm_paths = [f'{uploadpath}/{relpath}' for relpath in [kws['srpm']] + kws['rpms']]
rpms = ' '.join(rpm_paths)
# Get the packages signed
os.environ['LC_ALL'] = 'C'
logging.getLogger('koji.plugin.sign').info('Attempting to sign packages'
' (%s) with key "%s"' % (rpms, gpg_name))
rpm_cmd = "%s --resign --define '_signature gpg'" % rpm
rpm_cmd += " --define '_gpgbin %s'" % gpgbin
rpm_cmd += " --define '_gpg_path %s'" % gpg_path
if gpg_digest_algo:
rpm_cmd += " --define '_gpg_digest_algo %s'" % gpg_digest_algo
rpm_cmd += " --define '_gpg_name %s' %s" % (gpg_name, rpms)
pex = pexpect.spawn(rpm_cmd, timeout=30)
# Add rpm output to a temporary file
fout = TemporaryFile()
pex.logfile = fout
result = 0
# Yubikey occassionally requests password twice, I have no idea why
while result == 0:
# With pinentry-mode loopback, this is the only prompt output by GPG
result = pex.expect(GPG_EXPECTS, timeout=30)
if result == 0:
pex.sendline(gpg_pass)
pex.close()
ok = True
if result < 2 and pex.exitstatus == 0:
logging.getLogger('koji.plugin.sign').info('Package sign successful!')
else:
logging.getLogger('koji.plugin.sign').error(ERROR_MESSAGES.get(result, "Unknown signing error!"))
logging.getLogger('koji.plugin.sign').error("rpmsign exited with exit code %s, signal status %s", pex.exitstatus, pex.signalstatus)
ok = False
if not ok:
fout.seek(0)
# Add GPG errors to log
errors = ''
for line in fout.readlines():
errors += line.decode().replace(gpg_pass, '<gpg pass>')
fout.close()
raise Exception('Package sign failed!\n' + errors)
else:
fout.close()
# Sanity check, ensure that a signature exists for each rpm
non_signed_rpms = []
for processed_rpm in rpm_paths:
rpm_cmd = f"{rpm} -qpi {processed_rpm}"
pex = pexpect.spawn(rpm_cmd, timeout=1000)
result = pex.expect(['Signature.*:.*Key ID.*',pexpect.EOF], timeout=5)
pex.close()
if result != 0:
non_signed_rpms.append(processed_rpm)
if len(non_signed_rpms) > 0:
raise Exception('Signatures missing from the following packages: ' + ' '.join(non_signed_rpms))
register_callback('preImport', sign)