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"""Helper module for GPG signing"""
import os
import time
import bb
import oe.utils
class Pexpect(object):
"""Naive and limited (p)expect functionality"""
class PexpectErr(Exception):
"""Pexpect error"""
pass
def __init__(self, cmd):
import pty
self.pid, self.fd = pty.fork()
if self.pid == 0:
os.execv(cmd[0], cmd)
self.status = None
self.buf = ''
self.buf_readp = 0
def check_exitstatus(self):
"""Return child status or None if still alive"""
if self.status is None:
pid, status = os.waitpid(self.pid, os.WNOHANG)
if pid != 0:
self.status = status
return self.status
def close(self):
"""Close connection and terminate our child"""
import signal
if self.fd == -1:
return
os.close(self.fd)
self.fd = -1
time.sleep(0.1)
# Kill child process if it's still alive
if self.check_exitstatus() is None:
os.kill(self.pid, signal.SIGHUP)
# Give the process some time to terminate peacefully
time.sleep(0.5)
if self.check_exitstatus() is None:
os.kill(self.pid, signal.SIGKILL)
time.sleep(0.5)
if self.check_exitstatus() is None:
bb.warn('Failed to kill PID %d' % self.pid)
def expect_exact(self, expected, timeout):
"""Wait until expected output is detected. Use None to wait until EOF"""
import errno
import select
end_time = time.time() + timeout
while time.time() < end_time:
ready = select.select([self.fd], [], [], end_time - time.time())
if ready[0]:
try:
self.buf += os.read(self.fd, 4096)
except OSError as err:
if err.errno == errno.EIO:
if expected is None:
return
else:
raise self.PexpectErr("Unexpected EOF")
raise
if expected is not None:
ind = self.buf.find(expected, self.buf_readp)
if ind >= 0:
self.buf_readp = ind + len(expected)
return
elif len(self.buf) > len(expected):
# No need to search from beginning of buf every time
self.buf_readp = len(self.buf) - len(expected)
raise self.PexpectErr("Timeout")
def sendline(self, data):
"""Write data to child proces stdin"""
os.write(self.fd, data)
os.write(self.fd, '\n')
class LocalSigner(object):
"""Class for handling local (on the build host) signing"""
def __init__(self, d):
self.gpg_bin = d.getVar('GPG_BIN', True) or \
bb.utils.which(os.getenv('PATH'), 'gpg')
self.gpg_path = d.getVar('GPG_PATH', True)
self.rpm_bin = bb.utils.which(os.getenv('PATH'), "rpm")
def export_pubkey(self, output_file, keyid, armor=True):
"""Export GPG public key to a file"""
cmd = '%s --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
status, output = oe.utils.getstatusoutput(cmd)
if status:
raise bb.build.FuncFailed('Failed to export gpg public key (%s): %s' %
(keyid, output))
def sign_rpms(self, files, keyid, passphrase_file):
"""Sign RPM files"""
cmd = [self.rpm_bin, '--addsign', '--define', '_gpg_name ' + keyid]
if self.gpg_bin:
cmd += ['--define', '__gpg ' + self.gpg_bin]
if self.gpg_path:
cmd += ['--define', '_gpg_path ' + self.gpg_path]
cmd += files
# Need to use pexpect for feeding the passphrase
proc = Pexpect(cmd)
try:
proc.expect_exact('Enter pass phrase:', timeout=15)
with open(passphrase_file) as fobj:
proc.sendline(fobj.readline().rstrip('\n'))
proc.expect_exact(None, timeout=900)
except Pexpect.PexpectErr as err:
bb.error('rpmsign unexpected output: %s' % err)
proc.close()
status = proc.check_exitstatus()
if os.WEXITSTATUS(status) or not os.WIFEXITED(status):
bb.error('rpmsign failed: %s' % proc.buf[proc.buf_readp:])
raise bb.build.FuncFailed("Failed to sign RPM packages")
def detach_sign(self, input_file, keyid, passphrase_file, passphrase=None, armor=True):
"""Create a detached signature of a file"""
import subprocess
if passphrase_file and passphrase:
raise Exception("You should use either passphrase_file of passphrase, not both")
cmd = [self.gpg_bin, '--detach-sign', '--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
dots = self.get_gpg_version().split('.')
assert len(dots) >= 2
if int(dots[0]) >= 2 and int(dots[1]) >= 1:
cmd += ['--pinentry-mode', 'loopback']
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)
if job.returncode:
raise bb.build.FuncFailed("GPG exited with code %d: %s" %
(job.returncode, stderr))
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"""
import subprocess
try:
return subprocess.check_output((self.gpg_bin, "--version")).split()[2]
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 "
if self.gpg_path:
cmd += "--homedir %s " % self.gpg_path
cmd += sig_file
status, _ = oe.utils.getstatusoutput(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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