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"""The match_hostname() function from Python 3.5, essential when using SSL.""" # Note: This file is under the PSF license as the code comes from the python # stdlib. http://docs.python.org/3/license.html # It is modified to remove commonName support. from __future__ import annotations import ipaddress import re import typing from ipaddress import IPv4Address, IPv6Address if typing.TYPE_CHECKING: from .ssl_ import _TYPE_PEER_CERT_RET_DICT __version__ = "3.5.0.1" class CertificateError(ValueError): pass def _dnsname_match( dn: typing.Any, hostname: str, max_wildcards: int = 1 ) -> typing.Match[str] \| None \| bool: """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 bool(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 _ipaddress_match(ipname: str, host_ip: IPv4Address \| IPv6Address) -> bool: """Exact matching of IP addresses. RFC 9110 section 4.3.5: "A reference identity of IP-ID contains the decoded bytes of the IP address. An IP version 4 address is 4 octets, and an IP version 6 address is 16 octets. [...] A reference identity of type IP-ID matches if the address is identical to an iPAddress value of the subjectAltName extension of the certificate." """ # OpenSSL may add a trailing newline to a subjectAltName's IP address # Divergence from upstream: ipaddress can't handle byte str ip = ipaddress.ip_address(ipname.rstrip()) return bool(ip.packed == host_ip.packed) def match_hostname( cert: _TYPE_PEER_CERT_RET_DICT \| None, hostname: str, hostname_checks_common_name: bool = False, ) -> None: """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, match_hostname needs a " "SSL socket or SSL context with either " "CERT_OPTIONAL or CERT_REQUIRED" ) try: # Divergence from upstream: ipaddress can't handle byte str # # The ipaddress module shipped with Python < 3.9 does not support # scoped IPv6 addresses so we unconditionally strip the Zone IDs for # now. Once we drop support for Python 3.9 we can remove this branch. if "%" in hostname: host_ip = ipaddress.ip_address(hostname[: hostname.rfind("%")]) else: host_ip = ipaddress.ip_address(hostname) except ValueError: # Not an IP address (common case) host_ip = None dnsnames = [] san: tuple[tuple[str, str], ...] = cert.get("subjectAltName", ()) key: str value: str for key, value in san: if key == "DNS": if host_ip is None and _dnsname_match(value, hostname): return dnsnames.append(value) elif key == "IP Address": if host_ip is not None and _ipaddress_match(value, host_ip): return dnsnames.append(value) # We only check 'commonName' if it's enabled and we're not verifying # an IP address. IP addresses aren't valid within 'commonName'. if hostname_checks_common_name and host_ip is None and not dnsnames: for sub in cert.get("subject", ()): for key, value in sub: 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(f"hostname {hostname!r} doesn't match {dnsnames[0]!r}") else: raise CertificateError("no appropriate subjectAltName fields were found")