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Edit File : ssl_support.py \| Size : 8.29 KB
import os import socket import atexit import re import functools from setuptools.extern.six.moves import urllib, http_client, map, filter from pkg_resources import ResolutionError, ExtractionError try: import ssl except ImportError: ssl = None __all__ = [ 'VerifyingHTTPSHandler', 'find_ca_bundle', 'is_available', 'cert_paths', 'opener_for' ] cert_paths = """ /etc/pki/tls/certs/ca-bundle.crt /etc/ssl/certs/ca-certificates.crt /usr/share/ssl/certs/ca-bundle.crt /usr/local/share/certs/ca-root.crt /etc/ssl/cert.pem /System/Library/OpenSSL/certs/cert.pem /usr/local/share/certs/ca-root-nss.crt /etc/ssl/ca-bundle.pem """.strip().split() try: HTTPSHandler = urllib.request.HTTPSHandler HTTPSConnection = http_client.HTTPSConnection except AttributeError: HTTPSHandler = HTTPSConnection = object is_available = ssl is not None and object not in (HTTPSHandler, HTTPSConnection) try: from ssl import CertificateError, match_hostname except ImportError: try: from backports.ssl_match_hostname import CertificateError from backports.ssl_match_hostname import match_hostname except ImportError: CertificateError = None match_hostname = None if not CertificateError: class CertificateError(ValueError): pass if not match_hostname: def _dnsname_match(dn, hostname, max_wildcards=1): """Matching according to RFC 6125, section 6.4.3 http://tools.ietf.org/html/rfc6125#section-6.4.3 """ pats = [] if not dn: return False # Ported from python3-syntax: # leftmost, remainder = dn.split(r'.') parts = dn.split(r'.') leftmost = parts[0] remainder = parts[1:] wildcards = leftmost.count('') if wildcards > max_wildcards: # Issue #17980: avoid denials of service by refusing more # than one wildcard per fragment. A survey of established # policy among SSL implementations showed it to be a # reasonable choice. raise CertificateError( "too many wildcards in certificate DNS name: " + repr(dn)) # speed up common case w/o wildcards if not wildcards: return dn.lower() == hostname.lower() # RFC 6125, section 6.4.3, subitem 1. # The client SHOULD NOT attempt to match a presented identifier in which # the wildcard character comprises a label other than the left-most label. if leftmost == '': # When '' is a fragment by itself, it matches a non-empty dotless # fragment. pats.append('[^.]+') elif leftmost.startswith('xn--') or hostname.startswith('xn--'): # RFC 6125, section 6.4.3, subitem 3. # The client SHOULD NOT attempt to match a presented identifier # where the wildcard character is embedded within an A-label or # U-label of an internationalized domain name. pats.append(re.escape(leftmost)) else: # Otherwise, '' matches any dotless string, e.g. www pats.append(re.escape(leftmost).replace(r'\', '[^.]')) # add the remaining fragments, ignore any wildcards for frag in remainder: pats.append(re.escape(frag)) pat = re.compile(r'\A' + r'\.'.join(pats) + r'\Z', re.IGNORECASE) return pat.match(hostname) def match_hostname(cert, hostname): """Verify that cert (in decoded format as returned by SSLSocket.getpeercert()) matches the hostname. RFC 2818 and RFC 6125 rules are followed, but IP addresses are not accepted for hostname. CertificateError is raised on failure. On success, the function returns nothing. """ if not cert: raise ValueError("empty or no certificate") dnsnames = [] san = cert.get('subjectAltName', ()) for key, value in san: if key == 'DNS': if _dnsname_match(value, hostname): return dnsnames.append(value) if not dnsnames: # The subject is only checked when there is no dNSName entry # in subjectAltName for sub in cert.get('subject', ()): for key, value in sub: # XXX according to RFC 2818, the most specific Common Name # must be used. if key == 'commonName': if _dnsname_match(value, hostname): return dnsnames.append(value) if len(dnsnames) > 1: raise CertificateError("hostname %r " "doesn't match either of %s" % (hostname, ', '.join(map(repr, dnsnames)))) elif len(dnsnames) == 1: raise CertificateError("hostname %r " "doesn't match %r" % (hostname, dnsnames[0])) else: raise CertificateError("no appropriate commonName or " "subjectAltName fields were found") class VerifyingHTTPSHandler(HTTPSHandler): """Simple verifying handler: no auth, subclasses, timeouts, etc.""" def __init__(self, ca_bundle): self.ca_bundle = ca_bundle HTTPSHandler.__init__(self) def https_open(self, req): return self.do_open( lambda host, kw: VerifyingHTTPSConn(host, self.ca_bundle, kw), req ) class VerifyingHTTPSConn(HTTPSConnection): """Simple verifying connection: no auth, subclasses, timeouts, etc.""" def __init__(self, host, ca_bundle, kw): HTTPSConnection.__init__(self, host, kw) self.ca_bundle = ca_bundle def connect(self): sock = socket.create_connection( (self.host, self.port), getattr(self, 'source_address', None) ) # Handle the socket if a (proxy) tunnel is present if hasattr(self, '_tunnel') and getattr(self, '_tunnel_host', None): self.sock = sock self._tunnel() # http://bugs.python.org/issue7776: Python>=3.4.1 and >=2.7.7 # change self.host to mean the proxy server host when tunneling is # being used. Adapt, since we are interested in the destination # host for the match_hostname() comparison. actual_host = self._tunnel_host else: actual_host = self.host if hasattr(ssl, 'create_default_context'): ctx = ssl.create_default_context(cafile=self.ca_bundle) self.sock = ctx.wrap_socket(sock, server_hostname=actual_host) else: # This is for python < 2.7.9 and < 3.4? self.sock = ssl.wrap_socket( sock, cert_reqs=ssl.CERT_REQUIRED, ca_certs=self.ca_bundle ) try: match_hostname(self.sock.getpeercert(), actual_host) except CertificateError: self.sock.shutdown(socket.SHUT_RDWR) self.sock.close() raise def opener_for(ca_bundle=None): """Get a urlopen() replacement that uses ca_bundle for verification""" return urllib.request.build_opener( VerifyingHTTPSHandler(ca_bundle or find_ca_bundle()) ).open # from jaraco.functools def once(func): @functools.wraps(func) def wrapper(args, kwargs): if not hasattr(func, 'always_returns'): func.always_returns = func(args, **kwargs) return func.always_returns return wrapper @once def get_win_certfile(): try: import wincertstore except ImportError: return None class CertFile(wincertstore.CertFile): def __init__(self): super(CertFile, self).__init__() atexit.register(self.close) def close(self): try: super(CertFile, self).close() except OSError: pass _wincerts = CertFile() _wincerts.addstore('CA') _wincerts.addstore('ROOT') return _wincerts.name def find_ca_bundle(): """Return an existing CA bundle path, or None""" extant_cert_paths = filter(os.path.isfile, cert_paths) return ( get_win_certfile() or next(extant_cert_paths, None) or _certifi_where() ) def _certifi_where(): try: return __import__('certifi').where() except (ImportError, ResolutionError, ExtractionError): pass Back

Edit File : ssl_support.py | Size : 8.29 KB

import os
import socket
import atexit
import re
import functools

from setuptools.extern.six.moves import urllib, http_client, map, filter

from pkg_resources import ResolutionError, ExtractionError

try:
    import ssl
except ImportError:
    ssl = None

__all__ = [
    'VerifyingHTTPSHandler', 'find_ca_bundle', 'is_available', 'cert_paths',
    'opener_for'
]

cert_paths = """
/etc/pki/tls/certs/ca-bundle.crt
/etc/ssl/certs/ca-certificates.crt
/usr/share/ssl/certs/ca-bundle.crt
/usr/local/share/certs/ca-root.crt
/etc/ssl/cert.pem
/System/Library/OpenSSL/certs/cert.pem
/usr/local/share/certs/ca-root-nss.crt
/etc/ssl/ca-bundle.pem
""".strip().split()

try:
    HTTPSHandler = urllib.request.HTTPSHandler
    HTTPSConnection = http_client.HTTPSConnection
except AttributeError:
    HTTPSHandler = HTTPSConnection = object

is_available = ssl is not None and object not in (HTTPSHandler, HTTPSConnection)

try:
    from ssl import CertificateError, match_hostname
except ImportError:
    try:
        from backports.ssl_match_hostname import CertificateError
        from backports.ssl_match_hostname import match_hostname
    except ImportError:
        CertificateError = None
        match_hostname = None

if not CertificateError:

class CertificateError(ValueError):
        pass

if not match_hostname:

def _dnsname_match(dn, hostname, max_wildcards=1):
        """Matching according to RFC 6125, section 6.4.3

http://tools.ietf.org/html/rfc6125#section-6.4.3
        """
        pats = []
        if not dn:
            return False

# Ported from python3-syntax:
        # leftmost, *remainder = dn.split(r'.')
        parts = dn.split(r'.')
        leftmost = parts[0]
        remainder = parts[1:]

wildcards = leftmost.count('*')
        if wildcards > max_wildcards:
            # Issue #17980: avoid denials of service by refusing more
            # than one wildcard per fragment.  A survey of established
            # policy among SSL implementations showed it to be a
            # reasonable choice.
            raise CertificateError(
                "too many wildcards in certificate DNS name: " + repr(dn))

# speed up common case w/o wildcards
        if not wildcards:
            return dn.lower() == hostname.lower()

# RFC 6125, section 6.4.3, subitem 1.
        # The client SHOULD NOT attempt to match a presented identifier in which
        # the wildcard character comprises a label other than the left-most label.
        if leftmost == '*':
            # When '*' is a fragment by itself, it matches a non-empty dotless
            # fragment.
            pats.append('[^.]+')
        elif leftmost.startswith('xn--') or hostname.startswith('xn--'):
            # RFC 6125, section 6.4.3, subitem 3.
            # The client SHOULD NOT attempt to match a presented identifier
            # where the wildcard character is embedded within an A-label or
            # U-label of an internationalized domain name.
            pats.append(re.escape(leftmost))
        else:
            # Otherwise, '*' matches any dotless string, e.g. www*
            pats.append(re.escape(leftmost).replace(r'\*', '[^.]*'))

# add the remaining fragments, ignore any wildcards
        for frag in remainder:
            pats.append(re.escape(frag))

pat = re.compile(r'\A' + r'\.'.join(pats) + r'\Z', re.IGNORECASE)
        return pat.match(hostname)

def match_hostname(cert, hostname):
        """Verify that *cert* (in decoded format as returned by
        SSLSocket.getpeercert()) matches the *hostname*.  RFC 2818 and RFC 6125
        rules are followed, but IP addresses are not accepted for *hostname*.

CertificateError is raised on failure. On success, the function
        returns nothing.
        """
        if not cert:
            raise ValueError("empty or no certificate")
        dnsnames = []
        san = cert.get('subjectAltName', ())
        for key, value in san:
            if key == 'DNS':
                if _dnsname_match(value, hostname):
                    return
                dnsnames.append(value)
        if not dnsnames:
            # The subject is only checked when there is no dNSName entry
            # in subjectAltName
            for sub in cert.get('subject', ()):
                for key, value in sub:
                    # XXX according to RFC 2818, the most specific Common Name
                    # must be used.
                    if key == 'commonName':
                        if _dnsname_match(value, hostname):
                            return
                        dnsnames.append(value)
        if len(dnsnames) > 1:
            raise CertificateError("hostname %r "
                "doesn't match either of %s"
                % (hostname, ', '.join(map(repr, dnsnames))))
        elif len(dnsnames) == 1:
            raise CertificateError("hostname %r "
                "doesn't match %r"
                % (hostname, dnsnames[0]))
        else:
            raise CertificateError("no appropriate commonName or "
                "subjectAltName fields were found")

class VerifyingHTTPSHandler(HTTPSHandler):
    """Simple verifying handler: no auth, subclasses, timeouts, etc."""

def __init__(self, ca_bundle):
        self.ca_bundle = ca_bundle
        HTTPSHandler.__init__(self)

def https_open(self, req):
        return self.do_open(
            lambda host, **kw: VerifyingHTTPSConn(host, self.ca_bundle, **kw), req
        )

class VerifyingHTTPSConn(HTTPSConnection):
    """Simple verifying connection: no auth, subclasses, timeouts, etc."""

def __init__(self, host, ca_bundle, **kw):
        HTTPSConnection.__init__(self, host, **kw)
        self.ca_bundle = ca_bundle

def connect(self):
        sock = socket.create_connection(
            (self.host, self.port), getattr(self, 'source_address', None)
        )

# Handle the socket if a (proxy) tunnel is present
        if hasattr(self, '_tunnel') and getattr(self, '_tunnel_host', None):
            self.sock = sock
            self._tunnel()
            # http://bugs.python.org/issue7776: Python>=3.4.1 and >=2.7.7
            # change self.host to mean the proxy server host when tunneling is
            # being used. Adapt, since we are interested in the destination
            # host for the match_hostname() comparison.
            actual_host = self._tunnel_host
        else:
            actual_host = self.host

if hasattr(ssl, 'create_default_context'):
            ctx = ssl.create_default_context(cafile=self.ca_bundle)
            self.sock = ctx.wrap_socket(sock, server_hostname=actual_host)
        else:
            # This is for python < 2.7.9 and < 3.4?
            self.sock = ssl.wrap_socket(
                sock, cert_reqs=ssl.CERT_REQUIRED, ca_certs=self.ca_bundle
            )
        try:
            match_hostname(self.sock.getpeercert(), actual_host)
        except CertificateError:
            self.sock.shutdown(socket.SHUT_RDWR)
            self.sock.close()
            raise

def opener_for(ca_bundle=None):
    """Get a urlopen() replacement that uses ca_bundle for verification"""
    return urllib.request.build_opener(
        VerifyingHTTPSHandler(ca_bundle or find_ca_bundle())
    ).open

# from jaraco.functools
def once(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        if not hasattr(func, 'always_returns'):
            func.always_returns = func(*args, **kwargs)
        return func.always_returns
    return wrapper

@once
def get_win_certfile():
    try:
        import wincertstore
    except ImportError:
        return None

class CertFile(wincertstore.CertFile):
        def __init__(self):
            super(CertFile, self).__init__()
            atexit.register(self.close)

def close(self):
            try:
                super(CertFile, self).close()
            except OSError:
                pass

_wincerts = CertFile()
    _wincerts.addstore('CA')
    _wincerts.addstore('ROOT')
    return _wincerts.name

def find_ca_bundle():
    """Return an existing CA bundle path, or None"""
    extant_cert_paths = filter(os.path.isfile, cert_paths)
    return (
        get_win_certfile()
        or next(extant_cert_paths, None)
        or _certifi_where()
    )

def _certifi_where():
    try:
        return __import__('certifi').where()
    except (ImportError, ResolutionError, ExtractionError):
        pass

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