/usr/lib/python3/dist-packages/softwareproperties/ppa.py is in python3-software-properties 0.92.25debian1.
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#
# Copyright (c) 2004-2009 Canonical Ltd.
#
# Author: Michael Vogt <mvo@debian.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
from __future__ import print_function
import apt_pkg
import json
import os
import re
import shutil
import subprocess
import tempfile
from threading import Thread
try:
import urllib.request
from urllib.error import URLError
import urllib.parse
from http.client import HTTPException
NEED_PYCURL = False
except ImportError:
NEED_PYCURL = True
import pycurl
DEFAULT_KEYSERVER = "hkp://keyserver.ubuntu.com:80/"
# maintained until 2015
LAUNCHPAD_PPA_API = 'https://launchpad.net/api/1.0/~%s/+archive/%s'
# Specify to use the system default SSL store; change to a different path
# to test with custom certificates.
LAUNCHPAD_PPA_CERT = "/etc/ssl/certs/ca-certificates.crt"
class CurlCallback:
def __init__(self):
self.contents = ''
def body_callback(self, buf):
self.contents = self.contents + buf
class PPAException(Exception):
def __init__(self, value, original_error=None):
self.value = value
self.original_error = original_error
def __str__(self):
return repr(self.value)
def encode(s):
return re.sub("[^a-zA-Z0-9_-]", "_", s)
def expand_ppa_line(abrev, distro_codename):
""" Convert an abbreviated ppa name of the form 'ppa:$name' to a
proper sources.list line of the form 'deb ...' """
# leave non-ppa: lines unchanged
if not abrev.startswith("ppa:"):
return (abrev, None)
# FIXME: add support for dependency PPAs too (once we can get them
# via some sort of API, see LP #385129)
abrev = abrev.split(":")[1]
ppa_owner = abrev.split("/")[0]
try:
ppa_name = abrev.split("/")[1]
except IndexError as e:
ppa_name = "ppa"
sourceslistd = apt_pkg.config.find_dir("Dir::Etc::sourceparts")
line = "deb http://ppa.launchpad.net/%s/%s/ubuntu %s main" % (
ppa_owner, ppa_name, distro_codename)
filename = os.path.join(sourceslistd, "%s-%s-%s.list" % (
encode(ppa_owner), encode(ppa_name), distro_codename))
return (line, filename)
def get_ppa_info_from_lp(owner_name, ppa_name):
lp_url = LAUNCHPAD_PPA_API % (owner_name, ppa_name)
if NEED_PYCURL:
# python2 has no cert verification so we need pycurl
return _get_https_content_pycurl(lp_url)
else:
# python3 has cert verification so we can use the buildin urllib
return _get_https_content_py3(lp_url)
def _get_https_content_py3(lp_url):
try:
request = urllib.request.Request(str(lp_url), headers={"Accept":" application/json"})
lp_page = urllib.request.urlopen(request, cafile=LAUNCHPAD_PPA_CERT)
json_data = lp_page.read().decode("utf-8", "strict")
except (URLError, HTTPException) as e:
# HTTPException doesn't have a reason but might have a string
# representation
reason = hasattr(e, "reason") and e.reason or e
raise PPAException("Error reading %s: %s" % (lp_url, reason), e)
return json.loads(json_data)
def _get_https_content_pycurl(lp_url):
# this is the fallback code for python2
try:
callback = CurlCallback()
curl = pycurl.Curl()
curl.setopt(pycurl.SSL_VERIFYPEER, 1)
curl.setopt(pycurl.SSL_VERIFYHOST, 2)
curl.setopt(pycurl.WRITEFUNCTION, callback.body_callback)
if LAUNCHPAD_PPA_CERT:
curl.setopt(pycurl.CAINFO, LAUNCHPAD_PPA_CERT)
curl.setopt(pycurl.URL, str(lp_url))
curl.setopt(pycurl.HTTPHEADER, ["Accept: application/json"])
curl.perform()
curl.close()
json_data = callback.contents
except pycurl.error as e:
raise PPAException("Error reading %s: %s" % (lp_url, e), e)
return json.loads(json_data)
def verify_keyid_is_v4(signing_key_fingerprint):
"""Verify that the keyid is a v4 fingerprint with at least 160bit"""
return len(signing_key_fingerprint) >= 160/8
class AddPPASigningKeyThread(Thread):
" thread class for adding the signing key in the background "
GPG_DEFAULT_OPTIONS = ["gpg", "--no-default-keyring", "--no-options"]
def __init__(self, ppa_path, keyserver=None):
Thread.__init__(self)
self.ppa_path = ppa_path
self.keyserver = (keyserver if keyserver is not None
else DEFAULT_KEYSERVER)
def run(self):
self.add_ppa_signing_key(self.ppa_path)
def _recv_key(self, keyring, secret_keyring, signing_key_fingerprint, keyring_dir):
try:
# double check that the signing key is a v4 fingerprint (160bit)
if not verify_keyid_is_v4(signing_key_fingerprint):
print("Error: signing key fingerprint '%s' too short" %
signing_key_fingerprint)
return False
except TypeError:
print("Error: signing key fingerprint does not exist")
return False
# then get it
res = subprocess.call(self.GPG_DEFAULT_OPTIONS + [
"--homedir", keyring_dir,
"--secret-keyring", secret_keyring,
"--keyring", keyring,
"--keyserver", self.keyserver,
"--recv", signing_key_fingerprint,
])
return (res == 0)
def _export_key(self, keyring, export_keyring, signing_key_fingerprint, keyring_dir):
res = subprocess.call(self.GPG_DEFAULT_OPTIONS + [
"--homedir", keyring_dir,
"--keyring", keyring,
"--output", export_keyring,
"--export", signing_key_fingerprint,
])
if res != 0:
return False
return True
def _get_fingerprints(self, keyring, keyring_dir):
cmd = self.GPG_DEFAULT_OPTIONS + [
"--homedir", keyring_dir,
"--keyring", keyring,
"--fingerprint",
"--batch",
"--with-colons",
]
output = subprocess.check_output(cmd, universal_newlines=True)
fingerprints = []
for line in output.splitlines():
if line.startswith("fpr:"):
fingerprints.append(line.split(":")[9])
return fingerprints
def _verify_fingerprint(self, keyring, expected_fingerprint, keyring_dir):
got_fingerprints = self._get_fingerprints(keyring, keyring_dir)
if len(got_fingerprints) > 1:
print("Got '%s' fingerprints, expected only one" %
len(got_fingerprints))
return False
got_fingerprint = got_fingerprints[0]
if got_fingerprint != expected_fingerprint:
print("Fingerprints do not match, not importing: '%s' != '%s'" % (
expected_fingerprint, got_fingerprint))
return False
return True
def add_ppa_signing_key(self, ppa_path):
"""Query and add the corresponding PPA signing key.
The signing key fingerprint is obtained from the Launchpad PPA page,
via a secure channel, so it can be trusted.
"""
def cleanup(tmpdir):
shutil.rmtree(tmp_keyring_dir)
owner_name, ppa_name, distro = ppa_path[1:].split('/')
try:
ppa_info = get_ppa_info_from_lp(owner_name, ppa_name)
except PPAException as e:
print(e.value)
return False
try:
signing_key_fingerprint = ppa_info["signing_key_fingerprint"]
except IndexError as e:
print("Error: can't find signing_key_fingerprint at %s" % ppa_path)
return False
# create temp keyrings
tmp_keyring_dir = tempfile.mkdtemp()
tmp_secret_keyring = os.path.join(tmp_keyring_dir, "secring.gpg")
tmp_keyring = os.path.join(tmp_keyring_dir, "pubring.gpg")
# download the key into a temp keyring first
if not self._recv_key(
tmp_keyring, tmp_secret_keyring, signing_key_fingerprint, tmp_keyring_dir):
cleanup(tmp_keyring_dir)
return False
# now export the key into a temp keyring using the long key id
tmp_export_keyring = os.path.join(tmp_keyring_dir, "export-keyring.gpg")
if not self._export_key(
tmp_keyring, tmp_export_keyring, signing_key_fingerprint, tmp_keyring_dir):
cleanup(tmp_keyring_dir)
return False
# now verify the fingerprint
if not self._verify_fingerprint(
tmp_export_keyring, signing_key_fingerprint, tmp_keyring_dir):
cleanup(tmp_keyring_dir)
return False
# and add it
trustedgpgd = apt_pkg.config.find_dir("Dir::Etc::trustedparts")
apt_keyring = os.path.join(trustedgpgd, "%s-%s.gpg" % (
encode(owner_name), encode(ppa_name)))
res = subprocess.call(["apt-key", "--keyring", apt_keyring, "add",
tmp_keyring])
# cleanup
cleanup(tmp_keyring_dir)
return (res == 0)
if __name__ == "__main__":
import sys
owner_name, ppa_name = sys.argv[1].split(":")[1].split("/")
print(get_ppa_info_from_lp(owner_name, ppa_name))
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