bpo-34155: Dont parse domains containing @ (GH-13079)

Before:
    
        >>> email.message_from_string('From: a@malicious.org@important.com', policy=email.policy.default)['from'].addresses
        (Address(display_name='', username='a', domain='malicious.org'),)
    
        >>> parseaddr('a@malicious.org@important.com')
        ('', 'a@malicious.org')
    
    After:
    
        >>> email.message_from_string('From: a@malicious.org@important.com', policy=email.policy.default)['from'].addresses
        (Address(display_name='', username='', domain=''),)
    
        >>> parseaddr('a@malicious.org@important.com')
        ('', 'a@')




https://bugs.python.org/issue34155
This commit is contained in:
jpic 2019-07-17 23:54:25 +02:00 committed by Miss Islington (bot)
parent 719a062bcb
commit 8cb65d1381
5 changed files with 37 additions and 1 deletions

View File

@ -1587,6 +1587,8 @@ def get_domain(value):
token, value = get_dot_atom(value)
except errors.HeaderParseError:
token, value = get_atom(value)
if value and value[0] == '@':
raise errors.HeaderParseError('Invalid Domain')
if leader is not None:
token[:0] = [leader]
domain.append(token)

View File

@ -379,7 +379,12 @@ class AddrlistClass:
aslist.append('@')
self.pos += 1
self.gotonext()
return EMPTYSTRING.join(aslist) + self.getdomain()
domain = self.getdomain()
if not domain:
# Invalid domain, return an empty address instead of returning a
# local part to denote failed parsing.
return EMPTYSTRING
return EMPTYSTRING.join(aslist) + domain
def getdomain(self):
"""Get the complete domain name from an address."""
@ -394,6 +399,10 @@ class AddrlistClass:
elif self.field[self.pos] == '.':
self.pos += 1
sdlist.append('.')
elif self.field[self.pos] == '@':
# bpo-34155: Don't parse domains with two `@` like
# `a@malicious.org@important.com`.
return EMPTYSTRING
elif self.field[self.pos] in self.atomends:
break
else:

View File

@ -1448,6 +1448,16 @@ class TestParser(TestParserMixin, TestEmailBase):
self.assertEqual(addr_spec.domain, 'example.com')
self.assertEqual(addr_spec.addr_spec, 'star.a.star@example.com')
def test_get_addr_spec_multiple_domains(self):
with self.assertRaises(errors.HeaderParseError):
parser.get_addr_spec('star@a.star@example.com')
with self.assertRaises(errors.HeaderParseError):
parser.get_addr_spec('star@a@example.com')
with self.assertRaises(errors.HeaderParseError):
parser.get_addr_spec('star@172.17.0.1@example.com')
# get_obs_route
def test_get_obs_route_simple(self):

View File

@ -3041,6 +3041,20 @@ class TestMiscellaneous(TestEmailBase):
self.assertEqual(utils.parseaddr('<>'), ('', ''))
self.assertEqual(utils.formataddr(utils.parseaddr('<>')), '')
def test_parseaddr_multiple_domains(self):
self.assertEqual(
utils.parseaddr('a@b@c'),
('', '')
)
self.assertEqual(
utils.parseaddr('a@b.c@c'),
('', '')
)
self.assertEqual(
utils.parseaddr('a@172.17.0.1@c'),
('', '')
)
def test_noquote_dump(self):
self.assertEqual(
utils.formataddr(('A Silly Person', 'person@dom.ain')),

View File

@ -0,0 +1 @@
Fix parsing of invalid email addresses with more than one ``@`` (e.g. a@b@c.com.) to not return the part before 2nd ``@`` as valid email address. Patch by maxking & jpic.