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Update bundled copy of backports.ssl_match_hostname from 3.4.0.2 to 3.7.0.1 (#55461)

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* Update bundled copy of backports.ssl_match_hostname from 3.4.0.2 to 3.7.0.1. Fixes #51794

* Address linting issues

* ci_complete
pull/55663/head
Matt Martz 6 years ago committed by GitHub
parent 8f2976dcee
commit acc675e4a8
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 129 additions and 45 deletions
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3
changelogs/fragments/backports_ssl_match_hostname_bundle.yml
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@ -0,0 +1,3 @@
minor_changes:
- backports.ssl_match_hostname - Update bundled copy of backports.ssl_match_hostname from 3.4.0.2 to 3.7.0.1
(https://github.com/ansible/ansible/issues/51794)

171
lib/ansible/module_utils/urls.py
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@ -140,7 +140,7 @@ if not HAS_SSLCONTEXT and HAS_SSL:
# The following makes it easier for us to script updates of the bundled backports.ssl_match_hostname
# The bundled backports.ssl_match_hostname should really be moved into its own file for processing
_BUNDLED_METADATA = {"pypi_name": "backports.ssl_match_hostname", "version": "3.5.0.1"}
_BUNDLED_METADATA = {"pypi_name": "backports.ssl_match_hostname", "version": "3.7.0.1"}
LOADED_VERIFY_LOCATIONS = set()
@ -166,76 +166,157 @@ if not HAS_MATCH_HOSTNAME:
"""The match_hostname() function from Python 3.4, essential when using SSL."""
class CertificateError(ValueError):
pass
try:
# Divergence: Python-3.7+'s _ssl has this exception type but older Pythons do not
from _ssl import SSLCertVerificationError
CertificateError = SSLCertVerificationError
except ImportError:
class CertificateError(ValueError):
pass
def _dnsname_match(dn, hostname, max_wildcards=1):
def _dnsname_match(dn, hostname):
"""Matching according to RFC 6125, section 6.4.3
http://tools.ietf.org/html/rfc6125#section-6.4.3
- Hostnames are compared lower case.
- For IDNA, both dn and hostname must be encoded as IDN A-label (ACE).
- Partial wildcards like 'www*.example.org', multiple wildcards, sole
wildcard or wildcards in labels other then the left-most label are not
supported and a CertificateError is raised.
- A wildcard must match at least one character.
"""
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))
wildcards = dn.count('*')
# 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))
if wildcards > 1:
# Divergence .format() to percent formatting for Python < 2.6
raise CertificateError(
"too many wildcards in certificate DNS name: %s" % repr(dn))
dn_leftmost, sep, dn_remainder = dn.partition('.')
if '*' in dn_remainder:
# Only match wildcard in leftmost segment.
# Divergence .format() to percent formatting for Python < 2.6
raise CertificateError(
"wildcard can only be present in the leftmost label: "
"%s." % repr(dn))
if not sep:
# no right side
# Divergence .format() to percent formatting for Python < 2.6
raise CertificateError(
"sole wildcard without additional labels are not support: "
"%s." % repr(dn))
if dn_leftmost != '*':
# no partial wildcard matching
# Divergence .format() to percent formatting for Python < 2.6
raise CertificateError(
"partial wildcards in leftmost label are not supported: "
"%s." % repr(dn))
hostname_leftmost, sep, hostname_remainder = hostname.partition('.')
if not hostname_leftmost or not sep:
# wildcard must match at least one char
return False
return dn_remainder.lower() == hostname_remainder.lower()
def _inet_paton(ipname):
"""Try to convert an IP address to packed binary form
Supports IPv4 addresses on all platforms and IPv6 on platforms with IPv6
support.
"""
# inet_aton() also accepts strings like '1'
# Divergence: We make sure we have native string type for all python versions
try:
b_ipname = to_bytes(ipname, errors='strict')
except UnicodeError:
raise ValueError("%s must be an all-ascii string." % repr(ipname))
# Set ipname in native string format
if sys.version_info < (3,):
n_ipname = b_ipname
else:
# Otherwise, '*' matches any dotless string, e.g. www*
pats.append(re.escape(leftmost).replace(r'\*', '[^.]*'))
n_ipname = ipname
# add the remaining fragments, ignore any wildcards
for frag in remainder:
pats.append(re.escape(frag))
if n_ipname.count('.') == 3:
try:
return socket.inet_aton(n_ipname)
# Divergence: OSError on late python3. socket.error earlier.
# Null bytes generate ValueError on python3(we want to raise
# ValueError anyway), TypeError # earlier
except (OSError, socket.error, TypeError):
pass
pat = re.compile(r'\A' + r'\.'.join(pats) + r'\Z', re.IGNORECASE)
return pat.match(hostname)
try:
return socket.inet_pton(socket.AF_INET6, n_ipname)
# Divergence: OSError on late python3. socket.error earlier.
# Null bytes generate ValueError on python3(we want to raise
# ValueError anyway), TypeError # earlier
except (OSError, socket.error, TypeError):
# Divergence .format() to percent formatting for Python < 2.6
raise ValueError("%s is neither an IPv4 nor an IP6 "
"address." % repr(ipname))
except AttributeError:
# AF_INET6 not available
pass
# Divergence .format() to percent formatting for Python < 2.6
raise ValueError("%s is not an IPv4 address." % repr(ipname))
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
ip = _inet_paton(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*.
rules are followed.
The function matches IP addresses rather than dNSNames if hostname is a
valid ipaddress string. IPv4 addresses are supported on all platforms.
IPv6 addresses are supported on platforms with IPv6 support (AF_INET6
and inet_pton).
CertificateError is raised on failure. On success, the function
returns nothing.
"""
if not cert:
raise ValueError("empty or no certificate")
raise ValueError("empty or no certificate, match_hostname needs a "
"SSL socket or SSL context with either "
"CERT_OPTIONAL or CERT_REQUIRED")
try:
# Divergence: Deal with hostname as bytes
host_ip = _inet_paton(to_text(hostname, errors='strict'))
except UnicodeError:
# Divergence: Deal with hostname as byte strings.
# IP addresses should be all ascii, so we consider it not
# an IP address if this fails
host_ip = None
except ValueError:
# Not an IP address (common case)
host_ip = None
dnsnames = []
san = cert.get('subjectAltName', ())
for key, value in san:
if key == 'DNS':
if _dnsname_match(value, hostname):
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:
@ -250,7 +331,7 @@ if not HAS_MATCH_HOSTNAME:
return
dnsnames.append(value)
if len(dnsnames) > 1:
raise CertificateError("hostname %r " "doesn't match either of %s" % (hostname, ', '.join(map(repr, dnsnames))))
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:

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