/usr/share/pyshared/checkbox/lib/transport.py is in checkbox 0.13.7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of Checkbox.
#
# Copyright 2008 Canonical Ltd.
#
# Checkbox 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 3 of the License, or
# (at your option) any later version.
#
# Checkbox 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 Checkbox. If not, see <http://www.gnu.org/licenses/>.
#
import logging
import os
import re
import stat
import sys
import posixpath
import mimetools
import mimetypes
import socket
import httplib
import urllib
# Build the appropriate socket wrapper for ssl
try:
# Python 2.6 introduced a better ssl package
import ssl
_ssl_wrap_socket = ssl.wrap_socket
except ImportError:
# Python versions prior to 2.6 don't have ssl and ssl.wrap_socket instead
# they use httplib.FakeSocket
def _ssl_wrap_socket(sock, key_file, cert_file):
ssl_sock = socket.ssl(sock, key_file, cert_file)
return httplib.FakeSocket(sock, ssl_sock)
try:
# Python 2.6 introduced create_connection convenience function
create_connection = socket.create_connection
except AttributeError:
def create_connection(address, timeout=None):
msg = "getaddrinfo returns an empty list"
host, port = address
for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
af, socktype, proto, canonname, sa = res
sock = None
try:
sock = socket.socket(af, socktype, proto)
if timeout is not None:
sock.settimeout(timeout)
sock.connect(sa)
return sock
except socket.error, msg:
if sock is not None:
sock.close()
raise socket.error, msg
class ProxyHTTPConnection(httplib.HTTPConnection):
_ports = {"http" : httplib.HTTP_PORT, "https" : httplib.HTTPS_PORT}
def request(self, method, url, body=None, headers={}):
#request is called before connect, so can interpret url and get
#real host/port to be used to make CONNECT request to proxy
scheme, rest = urllib.splittype(url)
if scheme is None:
raise ValueError, "unknown URL type: %s" % url
#get host
host, rest = urllib.splithost(rest)
#try to get port
host, port = urllib.splitport(host)
#if port is not defined try to get from scheme
if port is None:
try:
port = self._ports[scheme]
except KeyError:
raise ValueError, "unknown protocol for: %s" % url
else:
port = int(port)
self._real_host = host
self._real_port = port
httplib.HTTPConnection.request(self, method, url, body, headers)
def connect(self):
httplib.HTTPConnection.connect(self)
#send proxy CONNECT request
self.send("CONNECT %s:%d HTTP/1.0\r\n\r\n" % (self._real_host, self._real_port))
#expect a HTTP/1.0 200 Connection established
response = self.response_class(self.sock, strict=self.strict, method=self._method)
(version, code, message) = response._read_status()
#probably here we can handle auth requests...
if code != 200:
#proxy returned and error, abort connection, and raise exception
self.close()
raise socket.error, "Proxy connection failed: %d %s" % (code, message.strip())
#eat up header block from proxy....
while True:
#should not use directly fp probablu
line = response.fp.readline()
if line == "\r\n":
break
class ProxyHTTPSConnection(ProxyHTTPConnection):
default_port = httplib.HTTPS_PORT
def __init__(self, host, port=None, key_file=None, cert_file=None, strict=None):
ProxyHTTPConnection.__init__(self, host, port)
self.key_file = key_file
self.cert_file = cert_file
def connect(self):
ProxyHTTPConnection.connect(self)
self.sock = _ssl_wrap_socket(self.sock, self.key_file, self.cert_file)
class VerifiedHTTPSConnection(httplib.HTTPSConnection):
# Compatibility layer with Python 2.5
timeout = None
_tunnel_host = None
def match_name(self, name):
parts = []
for fragment in name.split(r"."):
if fragment == "*":
parts.append(".+")
else:
fragment = re.escape(fragment)
parts.append(fragment.replace(r"\*", ".*"))
return re.match(r"\A" + r"\.".join(parts) + r"\Z", self.host, re.IGNORECASE)
def verify_cert(self, cert):
# verify that the hostname matches that of the certificate
if cert:
san = cert.get("subjectAltName", ())
for key, value in san:
if key == "DNS" and self.match_name(value):
return True
if not san:
for subject in cert.get("subject", ()):
for key, value in subject:
if key == "commonName" and self.match_name(value):
return True
return False
def connect(self):
# overrides the version in httplib so that we do
# certificate verification
sock = create_connection((self.host, self.port), self.timeout)
if self._tunnel_host:
self.sock = sock
self._tunnel()
# wrap the socket using verification with the root
# certs in trusted_root_certs
self.sock = _ssl_wrap_socket(sock,
self.key_file,
self.cert_file,
cert_reqs=ssl.CERT_REQUIRED,
ca_certs="/etc/ssl/certs/ca-certificates.crt")
if not self.verify_cert(self.sock.getpeercert()):
raise ValueError(
"Failed to verify cert for hostname: %s" % self.host)
class HTTPTransport(object):
"""Transport makes a request to exchange message data over HTTP."""
def __init__(self, url):
self.url = url
proxies = urllib.getproxies()
self.http_proxy = proxies.get("http")
self.https_proxy = proxies.get("https")
def _unpack_host_and_port(self, string):
scheme, rest = urllib.splittype(string)
host, rest = urllib.splithost(rest)
host, port = urllib.splitport(host)
if port is not None:
port = int(port)
return (host, port)
def _get_connection(self, timeout=0):
if timeout:
socket.setdefaulttimeout(timeout)
scheme, rest = urllib.splittype(self.url)
if scheme == "http":
if self.http_proxy:
host, port = self._unpack_host_and_port(self.http_proxy)
else:
host, port = self._unpack_host_and_port(self.url)
connection = httplib.HTTPConnection(host, port)
elif scheme == "https":
if self.https_proxy:
host, port = self._unpack_host_and_port(self.https_proxy)
connection = ProxyHTTPSConnection(host, port)
else:
host, port = self._unpack_host_and_port(self.url)
connection = VerifiedHTTPSConnection(host, port)
else:
raise Exception, "Unknown URL scheme: %s" % scheme
return connection
def _encode_multipart_formdata(self, fields=[], files=[]):
boundary = mimetools.choose_boundary()
lines = []
for (key, value) in fields:
lines.append("--" + boundary)
lines.append("Content-Disposition: form-data; name=\"%s\"" % key)
lines.append("")
lines.append(value)
for (key, file) in files:
if hasattr(file, "size"):
length = file.size
else:
length = os.fstat(file.fileno())[stat.ST_SIZE]
filename = posixpath.basename(file.name)
if isinstance(filename, unicode):
filename = filename.encode("UTF-8")
lines.append("--" + boundary)
lines.append("Content-Disposition: form-data; name=\"%s\"; filename=\"%s\""
% (key, filename))
lines.append("Content-Type: %s"
% mimetypes.guess_type(filename)[0] or "application/octet-stream")
lines.append("Content-Length: %s" % length)
lines.append("")
if hasattr(file, "seek"):
file.seek(0)
lines.append(file.read())
lines.append("--" + boundary + "--")
lines.append("")
content_type = "multipart/form-data; boundary=%s" % boundary
body = "\r\n".join(lines)
return content_type, body
def _encode_body(self, body=None):
fields = []
files = []
content_type = "application/octet-stream"
if body is not None and type(body) != str:
if hasattr(body, "items"):
body = body.items()
else:
try:
if len(body) and not isinstance(body[0], tuple):
raise TypeError
except TypeError:
ty, va, tb = sys.exc_info()
raise TypeError, \
"Invalid non-string sequence or mapping", tb
for key, value in body:
if hasattr(value, "read"):
files.append((key, value))
else:
fields.append((key, value))
if files:
content_type, body = self._encode_multipart_formdata(fields,
files)
elif fields:
content_type = "application/x-www-form-urlencoded"
body = urllib.urlencode(fields)
else:
body = ""
return content_type, body
def exchange(self, body=None, headers={}, timeout=0):
headers = dict(headers)
if body is not None:
method = "POST"
(content_type, body) = self._encode_body(body)
if "Content-Type" not in headers:
headers["Content-Type"] = content_type
if "Content-Length" not in headers:
headers["Content-Length"] = len(body)
else:
method = "GET"
response = None
connection = self._get_connection(timeout)
try:
connection.request(method, self.url, body, headers)
except IOError:
logging.warning("Can't connect to %s", self.url)
except socket.error:
logging.error("Error connecting to %s", self.url)
except socket.timeout:
logging.warning("Timeout connecting to %s", self.url)
else:
try:
response = connection.getresponse()
except httplib.BadStatusLine:
logging.warning("Service unavailable on %s", self.url)
else:
if response.status == httplib.FOUND:
# TODO prevent infinite redirect loop
self.url = response.getheader('location')
response = self.exchange(body, headers, timeout)
return response
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