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""" from __future__ import absolute_import, division, print_function import ipaddress import re import attr from ._compat import maketrans, text_type from .exceptions import ( CertificateError, DNSMismatch, IPAddressMismatch, SRVMismatch, URIMismatch, VerificationError, ) try: import idna except ImportError: # pragma: nocover idna = None @attr.s(slots=True) class ServiceMatch(object): """ A match of a service id and a certificate pattern. """ service_id = attr.ib() cert_pattern = attr.ib() def verify_service_identity(cert_patterns, obligatory_ids, optional_ids): """ Verify whether *cert_patterns* are valid for *obligatory_ids* and *optional_ids*. *obligatory_ids* must be both present and match. *optional_ids* must match if a pattern of the respective type is present. """ errors = [] matches = _find_matches(cert_patterns, obligatory_ids) + _find_matches( cert_patterns, optional_ids ) matched_ids = [match.service_id for match in matches] for i in obligatory_ids: if i not in matched_ids: errors.append(i.error_on_mismatch(mismatched_id=i)) for i in optional_ids: # If an optional ID is not matched by a certificate pattern *but* there # is a pattern of the same type , it is an error and the verification # fails. Example: the user passes a SRV-ID for "_mail.domain.com" but # the certificate contains an SRV-Pattern for "_xmpp.domain.com". if i not in matched_ids and _contains_instance_of( cert_patterns, i.pattern_class ): errors.append(i.error_on_mismatch(mismatched_id=i)) if errors: raise VerificationError(errors=errors) return matches def _find_matches(cert_patterns, service_ids): """ Search for matching certificate patterns and service_ids. :param cert_ids: List certificate IDs like DNSPattern. :type cert_ids: `list` :param service_ids: List of service IDs like DNS_ID. :type service_ids: `list` :rtype: `list` of `ServiceMatch` """ matches = [] for sid in service_ids: for cid in cert_patterns: if sid.verify(cid): matches.append(ServiceMatch(cert_pattern=cid, service_id=sid)) return matches def _contains_instance_of(seq, cl): """ :type seq: iterable :type cl: type :rtype: bool """ for e in seq: if isinstance(e, cl): return True return False def _is_ip_address(pattern): """ Check whether *pattern* could be/match an IP address. :param pattern: A pattern for a host name. :type pattern: `bytes` or `unicode` :return: `True` if *pattern* could be an IP address, else `False`. :rtype: bool """ if isinstance(pattern, bytes): try: pattern = pattern.decode("ascii") except UnicodeError: return False try: int(pattern) return True except ValueError: pass try: ipaddress.ip_address(pattern.replace("*", "1")) except ValueError: return False return True @attr.s(init=False, slots=True) class DNSPattern(object): """ A DNS pattern as extracted from certificates. """ pattern = attr.ib() _RE_LEGAL_CHARS = re.compile(br"^[a-z0-9\-_.]+$") def __init__(self, pattern): """ :type pattern: `bytes` """ if not isinstance(pattern, bytes): raise TypeError("The DNS pattern must be a bytes string.") pattern = pattern.strip() if pattern == b"" or _is_ip_address(pattern) or b"\0" in pattern: raise CertificateError( "Invalid DNS pattern {0!r}.".format(pattern) ) self.pattern = pattern.translate(_TRANS_TO_LOWER) if b"*" in self.pattern: _validate_pattern(self.pattern) @attr.s(slots=True) class IPAddressPattern(object): """ An IP address pattern as extracted from certificates. """ pattern = attr.ib() @classmethod def from_bytes(cls, bs): try: return cls(pattern=ipaddress.ip_address(bs)) except ValueError: raise CertificateError( "Invalid IP address pattern {!r}.".format(bs) ) @attr.s(init=False, slots=True) class URIPattern(object): """ An URI pattern as extracted from certificates. """ protocol_pattern = attr.ib() dns_pattern = attr.ib() def __init__(self, pattern): """ :type pattern: `bytes` """ if not isinstance(pattern, bytes): raise TypeError("The URI pattern must be a bytes string.") pattern = pattern.strip().translate(_TRANS_TO_LOWER) if b":" not in pattern or b"*" in pattern or _is_ip_address(pattern): raise CertificateError( "Invalid URI pattern {0!r}.".format(pattern) ) self.protocol_pattern, hostname = pattern.split(b":") self.dns_pattern = DNSPattern(hostname) @attr.s(init=False, slots=True) class SRVPattern(object): """ An SRV pattern as extracted from certificates. """ name_pattern = attr.ib() dns_pattern = attr.ib() def __init__(self, pattern): """ :type pattern: `bytes` """ if not isinstance(pattern, bytes): raise TypeError("The SRV pattern must be a bytes string.") pattern = pattern.strip().translate(_TRANS_TO_LOWER) if ( pattern[0] != b"_"[0] or b"." not in pattern or b"*" in pattern or _is_ip_address(pattern) ): raise CertificateError( "Invalid SRV pattern {0!r}.".format(pattern) ) name, hostname = pattern.split(b".", 1) self.name_pattern = name[1:] self.dns_pattern = DNSPattern(hostname) @attr.s(init=False, slots=True) class DNS_ID(object): """ A DNS service ID, aka hostname. """ hostname = attr.ib() # characters that are legal in a normalized hostname _RE_LEGAL_CHARS = re.compile(br"^[a-z0-9\-_.]+$") pattern_class = DNSPattern error_on_mismatch = DNSMismatch def __init__(self, hostname): """ :type hostname: `unicode` """ if not isinstance(hostname, text_type): raise TypeError("DNS-ID must be a unicode string.") hostname = hostname.strip() if hostname == u"" or _is_ip_address(hostname): raise ValueError("Invalid DNS-ID.") if any(ord(c) > 127 for c in hostname): if idna: ascii_id = idna.encode(hostname) else: raise ImportError( "idna library is required for non-ASCII IDs." ) else: ascii_id = hostname.encode("ascii") self.hostname = ascii_id.translate(_TRANS_TO_LOWER) if self._RE_LEGAL_CHARS.match(self.hostname) is None: raise ValueError("Invalid DNS-ID.") def verify(self, pattern): """ https://tools.ietf.org/search/rfc6125#section-6.4 """ if isinstance(pattern, self.pattern_class): return _hostname_matches(pattern.pattern, self.hostname) else: return False @attr.s(slots=True) class IPAddress_ID(object): """ An IP address service ID. """ ip = attr.ib(converter=ipaddress.ip_address) pattern_class = IPAddressPattern error_on_mismatch = IPAddressMismatch def verify(self, pattern): """ https://tools.ietf.org/search/rfc2818#section-3.1 """ return self.ip == pattern.pattern @attr.s(init=False, slots=True) class URI_ID(object): """ An URI service ID. """ protocol = attr.ib() dns_id = attr.ib() pattern_class = URIPattern error_on_mismatch = URIMismatch def __init__(self, uri): """ :type uri: `unicode` """ if not isinstance(uri, text_type): raise TypeError("URI-ID must be a unicode string.") uri = uri.strip() if u":" not in uri or _is_ip_address(uri): raise ValueError("Invalid URI-ID.") prot, hostname = uri.split(u":") self.protocol = prot.encode("ascii").translate(_TRANS_TO_LOWER) self.dns_id = DNS_ID(hostname.strip(u"/")) def verify(self, pattern): """ https://tools.ietf.org/search/rfc6125#section-6.5.2 """ if isinstance(pattern, self.pattern_class): return ( pattern.protocol_pattern == self.protocol and self.dns_id.verify(pattern.dns_pattern) ) else: return False @attr.s(init=False, slots=True) class SRV_ID(object): """ An SRV service ID. """ name = attr.ib() dns_id = attr.ib() pattern_class = SRVPattern error_on_mismatch = SRVMismatch def __init__(self, srv): """ :type srv: `unicode` """ if not isinstance(srv, text_type): raise TypeError("SRV-ID must be a unicode string.") srv = srv.strip() if u"." not in srv or _is_ip_address(srv) or srv[0] != u"_": raise ValueError("Invalid SRV-ID.") name, hostname = srv.split(u".", 1) self.name = name[1:].encode("ascii").translate(_TRANS_TO_LOWER) self.dns_id = DNS_ID(hostname) def verify(self, pattern): """ https://tools.ietf.org/search/rfc6125#section-6.5.1 """ if isinstance(pattern, self.pattern_class): return self.name == pattern.name_pattern and self.dns_id.verify( pattern.dns_pattern ) else: return False def _hostname_matches(cert_pattern, actual_hostname): """ :type cert_pattern: `bytes` :type actual_hostname: `bytes` :return: `True` if *cert_pattern* matches *actual_hostname*, else `False`. :rtype: `bool` """ if b"*" in cert_pattern: cert_head, cert_tail = cert_pattern.split(b".", 1) actual_head, actual_tail = actual_hostname.split(b".", 1) if cert_tail != actual_tail: return False # No patterns for IDNA if actual_head.startswith(b"xn--"): return False return cert_head == b"*" or cert_head == actual_head else: return cert_pattern == actual_hostname def _validate_pattern(cert_pattern): """ Check whether the usage of wildcards within *cert_pattern* conforms with our expectations. :type hostname: `bytes` :return: None """ cnt = cert_pattern.count(b"*") if cnt > 1: raise CertificateError( "Certificate's DNS-ID {0!r} contains too many wildcards.".format( cert_pattern ) ) parts = cert_pattern.split(b".") if len(parts) < 3: raise CertificateError( "Certificate's DNS-ID {0!r} has too few host components for " "wildcard usage.".format(cert_pattern) ) # We assume there will always be only one wildcard allowed. if b"*" not in parts[0]: raise CertificateError( "Certificate's DNS-ID {0!r} has a wildcard outside the left-most " "part.".format(cert_pattern) ) if any(not len(p) for p in parts): raise CertificateError( "Certificate's DNS-ID {0!r} contains empty parts.".format( cert_pattern ) ) # Ensure no locale magic interferes. _TRANS_TO_LOWER = maketrans( b"ABCDEFGHIJKLMNOPQRSTUVWXYZ", b"abcdefghijklmnopqrstuvwxyz" )