From ee3425b5bfba3262c3485265c3aaaf99169e11d0 Mon Sep 17 00:00:00 2001
From: Jeremy Cline <jcline@redhat.com>
Date: Mon, 29 Oct 2018 16:07:52 -0400
Subject: [PATCH] Unbundle ssl_match_hostname backport
Fedora has shipped 3.5+ for a long time and we depend on backports of
Python 2.
Signed-off-by: Jeremy Cline <jcline@redhat.com>
---
.../packages/ssl_match_hostname/__init__.py | 14 +-
.../ssl_match_hostname/_implementation.py | 156 ------------------
2 files changed, 3 insertions(+), 167 deletions(-)
delete mode 100644 src/urllib3/packages/ssl_match_hostname/_implementation.py
diff --git a/src/urllib3/packages/ssl_match_hostname/__init__.py b/src/urllib3/packages/ssl_match_hostname/__init__.py
index d6594eb..6bd8fb9 100644
--- a/src/urllib3/packages/ssl_match_hostname/__init__.py
+++ b/src/urllib3/packages/ssl_match_hostname/__init__.py
@@ -1,19 +1,11 @@
import sys
try:
- # Our match_hostname function is the same as 3.5's, so we only want to
- # import the match_hostname function if it's at least that good.
- if sys.version_info < (3, 5):
- raise ImportError("Fallback to vendored code")
-
+ # Python 3.5+
from ssl import CertificateError, match_hostname
except ImportError:
- try:
- # Backport of the function from a pypi module
- from backports.ssl_match_hostname import CertificateError, match_hostname
- except ImportError:
- # Our vendored copy
- from ._implementation import CertificateError, match_hostname
+ # Python 2
+ from backports.ssl_match_hostname import CertificateError, match_hostname
# Not needed, but documenting what we provide.
__all__ = ('CertificateError', 'match_hostname')
diff --git a/src/urllib3/packages/ssl_match_hostname/_implementation.py b/src/urllib3/packages/ssl_match_hostname/_implementation.py
deleted file mode 100644
index d6e66c0..0000000
--- a/src/urllib3/packages/ssl_match_hostname/_implementation.py
+++ /dev/null
@@ -1,156 +0,0 @@
-"""The match_hostname() function from Python 3.3.3, 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
-
-import re
-import sys
-
-# ipaddress has been backported to 2.6+ in pypi. If it is installed on the
-# system, use it to handle IPAddress ServerAltnames (this was added in
-# python-3.5) otherwise only do DNS matching. This allows
-# backports.ssl_match_hostname to continue to be used in Python 2.7.
-try:
- import ipaddress
-except ImportError:
- ipaddress = None
-
-__version__ = '3.5.0.1'
-
-
-class CertificateError(ValueError):
- pass
-
-
-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 _to_unicode(obj):
- if isinstance(obj, str) and sys.version_info < (3,):
- obj = unicode(obj, encoding='ascii', errors='strict')
- return obj
-
-def _ipaddress_match(ipname, host_ip):
- """Exact matching of IP addresses.
-
- RFC 6125 explicitly doesn't define an algorithm for this
- (section 1.7.2 - "Out of Scope").
- """
- # 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(_to_unicode(ipname).rstrip())
- return ip == host_ip
-
-
-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, 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
- host_ip = ipaddress.ip_address(_to_unicode(hostname))
- except ValueError:
- # Not an IP address (common case)
- host_ip = None
- except UnicodeError:
- # Divergence from upstream: Have to deal with ipaddress not taking
- # byte strings. addresses should be all ascii, so we consider it not
- # an ipaddress in this case
- host_ip = None
- except AttributeError:
- # Divergence from upstream: Make ipaddress library optional
- if ipaddress is None:
- host_ip = None
- else:
- raise
- dnsnames = []
- san = cert.get('subjectAltName', ())
- 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)
- 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")
--
2.19.1