ui: add special-purpose atexit functionality
In spite of its longstanding use, Python's built-in atexit code is
not suitable for Mercurial's purposes, for several reasons:
* Handlers run after application code has finished.
* Because of this, the code that runs handlers swallows exceptions
(since there's no possible stacktrace to associate errors with).
If we're lucky, we'll get something spat out to stderr (if stderr
still works), which of course isn't any use in a big deployment
where it's important that exceptions get logged and aggregated.
* Mercurial's current atexit handlers make unfortunate assumptions
about process state (specifically stdio) that, coupled with the
above problems, make it impossible to deal with certain categories
of error (try "hg status > /dev/full" on a Linux box).
* In Python 3, the atexit implementation is completely hidden, so
we can't hijack the platform's atexit code to run handlers at a
time of our choosing.
As a result, here's a perfectly cromulent atexit-like implementation
over which we have control. This lets us decide exactly when the
handlers run (after each request has completed), and control what
the process state is when that occurs (and afterwards).
# coding=utf-8
from __future__ import absolute_import, print_function
import doctest
import os
def check(a, b):
if a != b:
print((a, b))
def cert(cn):
return {'subject': ((('commonName', cn),),)}
from mercurial import (
sslutil,
)
_verifycert = sslutil._verifycert
# Test non-wildcard certificates
check(_verifycert(cert('example.com'), 'example.com'),
None)
check(_verifycert(cert('example.com'), 'www.example.com'),
'certificate is for example.com')
check(_verifycert(cert('www.example.com'), 'example.com'),
'certificate is for www.example.com')
# Test wildcard certificates
check(_verifycert(cert('*.example.com'), 'www.example.com'),
None)
check(_verifycert(cert('*.example.com'), 'example.com'),
'certificate is for *.example.com')
check(_verifycert(cert('*.example.com'), 'w.w.example.com'),
'certificate is for *.example.com')
# Test subjectAltName
san_cert = {'subject': ((('commonName', 'example.com'),),),
'subjectAltName': (('DNS', '*.example.net'),
('DNS', 'example.net'))}
check(_verifycert(san_cert, 'example.net'),
None)
check(_verifycert(san_cert, 'foo.example.net'),
None)
# no fallback to subject commonName when subjectAltName has DNS
check(_verifycert(san_cert, 'example.com'),
'certificate is for *.example.net, example.net')
# fallback to subject commonName when no DNS in subjectAltName
san_cert = {'subject': ((('commonName', 'example.com'),),),
'subjectAltName': (('IP Address', '8.8.8.8'),)}
check(_verifycert(san_cert, 'example.com'), None)
# Avoid some pitfalls
check(_verifycert(cert('*.foo'), 'foo'),
'certificate is for *.foo')
check(_verifycert(cert('*o'), 'foo'), None)
check(_verifycert({'subject': ()},
'example.com'),
'no commonName or subjectAltName found in certificate')
check(_verifycert(None, 'example.com'),
'no certificate received')
# Unicode (IDN) certname isn't supported
check(_verifycert(cert(u'\u4f8b.jp'), 'example.jp'),
'IDN in certificate not supported')
# The following tests are from CPython's test_ssl.py.
check(_verifycert(cert('example.com'), 'example.com'), None)
check(_verifycert(cert('example.com'), 'ExAmple.cOm'), None)
check(_verifycert(cert('example.com'), 'www.example.com'),
'certificate is for example.com')
check(_verifycert(cert('example.com'), '.example.com'),
'certificate is for example.com')
check(_verifycert(cert('example.com'), 'example.org'),
'certificate is for example.com')
check(_verifycert(cert('example.com'), 'exampleXcom'),
'certificate is for example.com')
check(_verifycert(cert('*.a.com'), 'foo.a.com'), None)
check(_verifycert(cert('*.a.com'), 'bar.foo.a.com'),
'certificate is for *.a.com')
check(_verifycert(cert('*.a.com'), 'a.com'),
'certificate is for *.a.com')
check(_verifycert(cert('*.a.com'), 'Xa.com'),
'certificate is for *.a.com')
check(_verifycert(cert('*.a.com'), '.a.com'),
'certificate is for *.a.com')
# only match one left-most wildcard
check(_verifycert(cert('f*.com'), 'foo.com'), None)
check(_verifycert(cert('f*.com'), 'f.com'), None)
check(_verifycert(cert('f*.com'), 'bar.com'),
'certificate is for f*.com')
check(_verifycert(cert('f*.com'), 'foo.a.com'),
'certificate is for f*.com')
check(_verifycert(cert('f*.com'), 'bar.foo.com'),
'certificate is for f*.com')
# NULL bytes are bad, CVE-2013-4073
check(_verifycert(cert('null.python.org\x00example.org'),
'null.python.org\x00example.org'), None)
check(_verifycert(cert('null.python.org\x00example.org'),
'example.org'),
'certificate is for null.python.org\x00example.org')
check(_verifycert(cert('null.python.org\x00example.org'),
'null.python.org'),
'certificate is for null.python.org\x00example.org')
# error cases with wildcards
check(_verifycert(cert('*.*.a.com'), 'bar.foo.a.com'),
'certificate is for *.*.a.com')
check(_verifycert(cert('*.*.a.com'), 'a.com'),
'certificate is for *.*.a.com')
check(_verifycert(cert('*.*.a.com'), 'Xa.com'),
'certificate is for *.*.a.com')
check(_verifycert(cert('*.*.a.com'), '.a.com'),
'certificate is for *.*.a.com')
check(_verifycert(cert('a.*.com'), 'a.foo.com'),
'certificate is for a.*.com')
check(_verifycert(cert('a.*.com'), 'a..com'),
'certificate is for a.*.com')
check(_verifycert(cert('a.*.com'), 'a.com'),
'certificate is for a.*.com')
# wildcard doesn't match IDNA prefix 'xn--'
idna = u'püthon.python.org'.encode('idna').decode('ascii')
check(_verifycert(cert(idna), idna), None)
check(_verifycert(cert('x*.python.org'), idna),
'certificate is for x*.python.org')
check(_verifycert(cert('xn--p*.python.org'), idna),
'certificate is for xn--p*.python.org')
# wildcard in first fragment and IDNA A-labels in sequent fragments
# are supported.
idna = u'www*.pythön.org'.encode('idna').decode('ascii')
check(_verifycert(cert(idna),
u'www.pythön.org'.encode('idna').decode('ascii')),
None)
check(_verifycert(cert(idna),
u'www1.pythön.org'.encode('idna').decode('ascii')),
None)
check(_verifycert(cert(idna),
u'ftp.pythön.org'.encode('idna').decode('ascii')),
'certificate is for www*.xn--pythn-mua.org')
check(_verifycert(cert(idna),
u'pythön.org'.encode('idna').decode('ascii')),
'certificate is for www*.xn--pythn-mua.org')
c = {
'notAfter': 'Jun 26 21:41:46 2011 GMT',
'subject': (((u'commonName', u'linuxfrz.org'),),),
'subjectAltName': (
('DNS', 'linuxfr.org'),
('DNS', 'linuxfr.com'),
('othername', '<unsupported>'),
)
}
check(_verifycert(c, 'linuxfr.org'), None)
check(_verifycert(c, 'linuxfr.com'), None)
# Not a "DNS" entry
check(_verifycert(c, '<unsupported>'),
'certificate is for linuxfr.org, linuxfr.com')
# When there is a subjectAltName, commonName isn't used
check(_verifycert(c, 'linuxfrz.org'),
'certificate is for linuxfr.org, linuxfr.com')
# A pristine real-world example
c = {
'notAfter': 'Dec 18 23:59:59 2011 GMT',
'subject': (
((u'countryName', u'US'),),
((u'stateOrProvinceName', u'California'),),
((u'localityName', u'Mountain View'),),
((u'organizationName', u'Google Inc'),),
((u'commonName', u'mail.google.com'),),
),
}
check(_verifycert(c, 'mail.google.com'), None)
check(_verifycert(c, 'gmail.com'), 'certificate is for mail.google.com')
# Only commonName is considered
check(_verifycert(c, 'California'), 'certificate is for mail.google.com')
# Neither commonName nor subjectAltName
c = {
'notAfter': 'Dec 18 23:59:59 2011 GMT',
'subject': (
((u'countryName', u'US'),),
((u'stateOrProvinceName', u'California'),),
((u'localityName', u'Mountain View'),),
((u'organizationName', u'Google Inc'),),
),
}
check(_verifycert(c, 'mail.google.com'),
'no commonName or subjectAltName found in certificate')
# No DNS entry in subjectAltName but a commonName
c = {
'notAfter': 'Dec 18 23:59:59 2099 GMT',
'subject': (
((u'countryName', u'US'),),
((u'stateOrProvinceName', u'California'),),
((u'localityName', u'Mountain View'),),
((u'commonName', u'mail.google.com'),),
),
'subjectAltName': (('othername', 'blabla'),),
}
check(_verifycert(c, 'mail.google.com'), None)
# No DNS entry subjectAltName and no commonName
c = {
'notAfter': 'Dec 18 23:59:59 2099 GMT',
'subject': (
((u'countryName', u'US'),),
((u'stateOrProvinceName', u'California'),),
((u'localityName', u'Mountain View'),),
((u'organizationName', u'Google Inc'),),
),
'subjectAltName': (('othername', 'blabla'),),
}
check(_verifycert(c, 'google.com'),
'no commonName or subjectAltName found in certificate')
# Empty cert / no cert
check(_verifycert(None, 'example.com'), 'no certificate received')
check(_verifycert({}, 'example.com'), 'no certificate received')
# avoid denials of service by refusing more than one
# wildcard per fragment.
check(_verifycert({'subject': (((u'commonName', u'a*b.com'),),)},
'axxb.com'), None)
check(_verifycert({'subject': (((u'commonName', u'a*b.co*'),),)},
'axxb.com'), 'certificate is for a*b.co*')
check(_verifycert({'subject': (((u'commonName', u'a*b*.com'),),)},
'axxbxxc.com'),
'too many wildcards in certificate DNS name: a*b*.com')
def test_url():
"""
>>> from mercurial.util import url
This tests for edge cases in url.URL's parsing algorithm. Most of
these aren't useful for documentation purposes, so they aren't
part of the class's doc tests.
Query strings and fragments:
>>> url('http://host/a?b#c')
<url scheme: 'http', host: 'host', path: 'a', query: 'b', fragment: 'c'>
>>> url('http://host/a?')
<url scheme: 'http', host: 'host', path: 'a'>
>>> url('http://host/a#b#c')
<url scheme: 'http', host: 'host', path: 'a', fragment: 'b#c'>
>>> url('http://host/a#b?c')
<url scheme: 'http', host: 'host', path: 'a', fragment: 'b?c'>
>>> url('http://host/?a#b')
<url scheme: 'http', host: 'host', path: '', query: 'a', fragment: 'b'>
>>> url('http://host/?a#b', parsequery=False)
<url scheme: 'http', host: 'host', path: '?a', fragment: 'b'>
>>> url('http://host/?a#b', parsefragment=False)
<url scheme: 'http', host: 'host', path: '', query: 'a#b'>
>>> url('http://host/?a#b', parsequery=False, parsefragment=False)
<url scheme: 'http', host: 'host', path: '?a#b'>
IPv6 addresses:
>>> url('ldap://[2001:db8::7]/c=GB?objectClass?one')
<url scheme: 'ldap', host: '[2001:db8::7]', path: 'c=GB',
query: 'objectClass?one'>
>>> url('ldap://joe:xxx@[2001:db8::7]:80/c=GB?objectClass?one')
<url scheme: 'ldap', user: 'joe', passwd: 'xxx', host: '[2001:db8::7]',
port: '80', path: 'c=GB', query: 'objectClass?one'>
Missing scheme, host, etc.:
>>> url('://192.0.2.16:80/')
<url path: '://192.0.2.16:80/'>
>>> url('https://mercurial-scm.org')
<url scheme: 'https', host: 'mercurial-scm.org'>
>>> url('/foo')
<url path: '/foo'>
>>> url('bundle:/foo')
<url scheme: 'bundle', path: '/foo'>
>>> url('a?b#c')
<url path: 'a?b', fragment: 'c'>
>>> url('http://x.com?arg=/foo')
<url scheme: 'http', host: 'x.com', query: 'arg=/foo'>
>>> url('http://joe:xxx@/foo')
<url scheme: 'http', user: 'joe', passwd: 'xxx', path: 'foo'>
Just a scheme and a path:
>>> url('mailto:John.Doe@example.com')
<url scheme: 'mailto', path: 'John.Doe@example.com'>
>>> url('a:b:c:d')
<url path: 'a:b:c:d'>
>>> url('aa:bb:cc:dd')
<url scheme: 'aa', path: 'bb:cc:dd'>
SSH examples:
>>> url('ssh://joe@host//home/joe')
<url scheme: 'ssh', user: 'joe', host: 'host', path: '/home/joe'>
>>> url('ssh://joe:xxx@host/src')
<url scheme: 'ssh', user: 'joe', passwd: 'xxx', host: 'host', path: 'src'>
>>> url('ssh://joe:xxx@host')
<url scheme: 'ssh', user: 'joe', passwd: 'xxx', host: 'host'>
>>> url('ssh://joe@host')
<url scheme: 'ssh', user: 'joe', host: 'host'>
>>> url('ssh://host')
<url scheme: 'ssh', host: 'host'>
>>> url('ssh://')
<url scheme: 'ssh'>
>>> url('ssh:')
<url scheme: 'ssh'>
Non-numeric port:
>>> url('http://example.com:dd')
<url scheme: 'http', host: 'example.com', port: 'dd'>
>>> url('ssh://joe:xxx@host:ssh/foo')
<url scheme: 'ssh', user: 'joe', passwd: 'xxx', host: 'host', port: 'ssh',
path: 'foo'>
Bad authentication credentials:
>>> url('http://joe@joeville:123@4:@host/a?b#c')
<url scheme: 'http', user: 'joe@joeville', passwd: '123@4:',
host: 'host', path: 'a', query: 'b', fragment: 'c'>
>>> url('http://!*#?/@!*#?/:@host/a?b#c')
<url scheme: 'http', host: '!*', fragment: '?/@!*#?/:@host/a?b#c'>
>>> url('http://!*#?@!*#?:@host/a?b#c')
<url scheme: 'http', host: '!*', fragment: '?@!*#?:@host/a?b#c'>
>>> url('http://!*@:!*@@host/a?b#c')
<url scheme: 'http', user: '!*@', passwd: '!*@', host: 'host',
path: 'a', query: 'b', fragment: 'c'>
File paths:
>>> url('a/b/c/d.g.f')
<url path: 'a/b/c/d.g.f'>
>>> url('/x///z/y/')
<url path: '/x///z/y/'>
>>> url('/foo:bar')
<url path: '/foo:bar'>
>>> url('\\\\foo:bar')
<url path: '\\\\foo:bar'>
>>> url('./foo:bar')
<url path: './foo:bar'>
Non-localhost file URL:
>>> u = url('file://mercurial-scm.org/foo')
Traceback (most recent call last):
File "<stdin>", line 1, in ?
Abort: file:// URLs can only refer to localhost
Empty URL:
>>> u = url('')
>>> u
<url path: ''>
>>> str(u)
''
Empty path with query string:
>>> str(url('http://foo/?bar'))
'http://foo/?bar'
Invalid path:
>>> u = url('http://foo/bar')
>>> u.path = 'bar'
>>> str(u)
'http://foo/bar'
>>> u = url('file:/foo/bar/baz')
>>> u
<url scheme: 'file', path: '/foo/bar/baz'>
>>> str(u)
'file:///foo/bar/baz'
>>> u.localpath()
'/foo/bar/baz'
>>> u = url('file:///foo/bar/baz')
>>> u
<url scheme: 'file', path: '/foo/bar/baz'>
>>> str(u)
'file:///foo/bar/baz'
>>> u.localpath()
'/foo/bar/baz'
>>> u = url('file:///f:oo/bar/baz')
>>> u
<url scheme: 'file', path: 'f:oo/bar/baz'>
>>> str(u)
'file:///f:oo/bar/baz'
>>> u.localpath()
'f:oo/bar/baz'
>>> u = url('file://localhost/f:oo/bar/baz')
>>> u
<url scheme: 'file', host: 'localhost', path: 'f:oo/bar/baz'>
>>> str(u)
'file://localhost/f:oo/bar/baz'
>>> u.localpath()
'f:oo/bar/baz'
>>> u = url('file:foo/bar/baz')
>>> u
<url scheme: 'file', path: 'foo/bar/baz'>
>>> str(u)
'file:foo/bar/baz'
>>> u.localpath()
'foo/bar/baz'
"""
if 'TERM' in os.environ:
del os.environ['TERM']
doctest.testmod(optionflags=doctest.NORMALIZE_WHITESPACE)