From 4d069d5b1170b9d82013ab824ff5d6cf28964d97 Mon Sep 17 00:00:00 2001 From: Petr Viktorin Date: Fri, 6 Sep 2024 13:14:09 +0200 Subject: [PATCH] [3.8] [CVE-2023-27043] gh-102988: Reject malformed addresses in email.parseaddr() (GH-111116) (#123770) Detect email address parsing errors and return empty tuple to indicate the parsing error (old API). Add an optional 'strict' parameter to getaddresses() and parseaddr() functions. Patch by Thomas Dwyer. (cherry picked from commit 4a153a1d3b18803a684cd1bcc2cdf3ede3dbae19) Co-authored-by: Victor Stinner Co-Authored-By: Thomas Dwyer --- Doc/library/email.utils.rst | 19 +- Doc/whatsnew/3.8.rst | 10 + Lib/email/utils.py | 151 ++++++++++++- Lib/test/test_email/test_email.py | 204 +++++++++++++++++- ...-10-20-15-28-08.gh-issue-102988.dStNO7.rst | 8 + 5 files changed, 371 insertions(+), 21 deletions(-) create mode 100644 Misc/NEWS.d/next/Library/2023-10-20-15-28-08.gh-issue-102988.dStNO7.rst diff --git a/Doc/library/email.utils.rst b/Doc/library/email.utils.rst index 4d0e920eb0ad29..4bd4d0aaa6d895 100644 --- a/Doc/library/email.utils.rst +++ b/Doc/library/email.utils.rst @@ -60,13 +60,18 @@ of the new API. begins with angle brackets, they are stripped off. -.. function:: parseaddr(address) +.. function:: parseaddr(address, *, strict=True) Parse address -- which should be the value of some address-containing field such as :mailheader:`To` or :mailheader:`Cc` -- into its constituent *realname* and *email address* parts. Returns a tuple of that information, unless the parse fails, in which case a 2-tuple of ``('', '')`` is returned. + If *strict* is true, use a strict parser which rejects malformed inputs. + + .. versionchanged:: 3.8.20 + Add *strict* optional parameter and reject malformed inputs by default. + .. function:: formataddr(pair, charset='utf-8') @@ -84,12 +89,15 @@ of the new API. Added the *charset* option. -.. function:: getaddresses(fieldvalues) +.. function:: getaddresses(fieldvalues, *, strict=True) This method returns a list of 2-tuples of the form returned by ``parseaddr()``. *fieldvalues* is a sequence of header field values as might be returned by - :meth:`Message.get_all `. Here's a simple - example that gets all the recipients of a message:: + :meth:`Message.get_all `. + + If *strict* is true, use a strict parser which rejects malformed inputs. + + Here's a simple example that gets all the recipients of a message:: from email.utils import getaddresses @@ -99,6 +107,9 @@ of the new API. resent_ccs = msg.get_all('resent-cc', []) all_recipients = getaddresses(tos + ccs + resent_tos + resent_ccs) + .. versionchanged:: 3.8.20 + Add *strict* optional parameter and reject malformed inputs by default. + .. function:: parsedate(date) diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst index c9496ec3d3ac9a..e63afb910a024f 100644 --- a/Doc/whatsnew/3.8.rst +++ b/Doc/whatsnew/3.8.rst @@ -2392,3 +2392,13 @@ email If you need to turn this safety feature off, set :attr:`~email.policy.Policy.verify_generated_headers`. (Contributed by Bas Bloemsaat and Petr Viktorin in :gh:`121650`.) + +* :func:`email.utils.getaddresses` and :func:`email.utils.parseaddr` now return + ``('', '')`` 2-tuples in more situations where invalid email addresses are + encountered, instead of potentially inaccurate values. + An optional *strict* parameter was added to these two functions: + use ``strict=False`` to get the old behavior, accepting malformed inputs. + ``getattr(email.utils, 'supports_strict_parsing', False)`` can be used to + check if the *strict* paramater is available. + (Contributed by Thomas Dwyer and Victor Stinner for :gh:`102988` to improve + the CVE-2023-27043 fix.) diff --git a/Lib/email/utils.py b/Lib/email/utils.py index 07dd029cc02800..99773d0b930ad3 100644 --- a/Lib/email/utils.py +++ b/Lib/email/utils.py @@ -48,6 +48,7 @@ specialsre = re.compile(r'[][\\()<>@,:;".]') escapesre = re.compile(r'[\\"]') + def _has_surrogates(s): """Return True if s contains surrogate-escaped binary data.""" # This check is based on the fact that unless there are surrogates, utf8 @@ -106,12 +107,127 @@ def formataddr(pair, charset='utf-8'): return address +def _iter_escaped_chars(addr): + pos = 0 + escape = False + for pos, ch in enumerate(addr): + if escape: + yield (pos, '\\' + ch) + escape = False + elif ch == '\\': + escape = True + else: + yield (pos, ch) + if escape: + yield (pos, '\\') + + +def _strip_quoted_realnames(addr): + """Strip real names between quotes.""" + if '"' not in addr: + # Fast path + return addr + + start = 0 + open_pos = None + result = [] + for pos, ch in _iter_escaped_chars(addr): + if ch == '"': + if open_pos is None: + open_pos = pos + else: + if start != open_pos: + result.append(addr[start:open_pos]) + start = pos + 1 + open_pos = None + + if start < len(addr): + result.append(addr[start:]) + + return ''.join(result) -def getaddresses(fieldvalues): - """Return a list of (REALNAME, EMAIL) for each fieldvalue.""" - all = COMMASPACE.join(fieldvalues) - a = _AddressList(all) - return a.addresslist + +supports_strict_parsing = True + +def getaddresses(fieldvalues, *, strict=True): + """Return a list of (REALNAME, EMAIL) or ('','') for each fieldvalue. + + When parsing fails for a fieldvalue, a 2-tuple of ('', '') is returned in + its place. + + If strict is true, use a strict parser which rejects malformed inputs. + """ + + # If strict is true, if the resulting list of parsed addresses is greater + # than the number of fieldvalues in the input list, a parsing error has + # occurred and consequently a list containing a single empty 2-tuple [('', + # '')] is returned in its place. This is done to avoid invalid output. + # + # Malformed input: getaddresses(['alice@example.com ']) + # Invalid output: [('', 'alice@example.com'), ('', 'bob@example.com')] + # Safe output: [('', '')] + + if not strict: + all = COMMASPACE.join(str(v) for v in fieldvalues) + a = _AddressList(all) + return a.addresslist + + fieldvalues = [str(v) for v in fieldvalues] + fieldvalues = _pre_parse_validation(fieldvalues) + addr = COMMASPACE.join(fieldvalues) + a = _AddressList(addr) + result = _post_parse_validation(a.addresslist) + + # Treat output as invalid if the number of addresses is not equal to the + # expected number of addresses. + n = 0 + for v in fieldvalues: + # When a comma is used in the Real Name part it is not a deliminator. + # So strip those out before counting the commas. + v = _strip_quoted_realnames(v) + # Expected number of addresses: 1 + number of commas + n += 1 + v.count(',') + if len(result) != n: + return [('', '')] + + return result + + +def _check_parenthesis(addr): + # Ignore parenthesis in quoted real names. + addr = _strip_quoted_realnames(addr) + + opens = 0 + for pos, ch in _iter_escaped_chars(addr): + if ch == '(': + opens += 1 + elif ch == ')': + opens -= 1 + if opens < 0: + return False + return (opens == 0) + + +def _pre_parse_validation(email_header_fields): + accepted_values = [] + for v in email_header_fields: + if not _check_parenthesis(v): + v = "('', '')" + accepted_values.append(v) + + return accepted_values + + +def _post_parse_validation(parsed_email_header_tuples): + accepted_values = [] + # The parser would have parsed a correctly formatted domain-literal + # The existence of an [ after parsing indicates a parsing failure + for v in parsed_email_header_tuples: + if '[' in v[1]: + v = ('', '') + accepted_values.append(v) + + return accepted_values def _format_timetuple_and_zone(timetuple, zone): @@ -202,16 +318,33 @@ def parsedate_to_datetime(data): tzinfo=datetime.timezone(datetime.timedelta(seconds=tz))) -def parseaddr(addr): +def parseaddr(addr, *, strict=True): """ Parse addr into its constituent realname and email address parts. Return a tuple of realname and email address, unless the parse fails, in which case return a 2-tuple of ('', ''). + + If strict is True, use a strict parser which rejects malformed inputs. """ - addrs = _AddressList(addr).addresslist - if not addrs: - return '', '' + if not strict: + addrs = _AddressList(addr).addresslist + if not addrs: + return ('', '') + return addrs[0] + + if isinstance(addr, list): + addr = addr[0] + + if not isinstance(addr, str): + return ('', '') + + addr = _pre_parse_validation([addr])[0] + addrs = _post_parse_validation(_AddressList(addr).addresslist) + + if not addrs or len(addrs) > 1: + return ('', '') + return addrs[0] diff --git a/Lib/test/test_email/test_email.py b/Lib/test/test_email/test_email.py index d68de61bb696b9..ee9a9645f55421 100644 --- a/Lib/test/test_email/test_email.py +++ b/Lib/test/test_email/test_email.py @@ -16,6 +16,7 @@ import email import email.policy +import email.utils from email.charset import Charset from email.header import Header, decode_header, make_header @@ -3248,15 +3249,154 @@ def test_getaddresses(self): [('Al Person', 'aperson@dom.ain'), ('Bud Person', 'bperson@dom.ain')]) + def test_getaddresses_comma_in_name(self): + """GH-106669 regression test.""" + self.assertEqual( + utils.getaddresses( + [ + '"Bud, Person" ', + 'aperson@dom.ain (Al Person)', + '"Mariusz Felisiak" ', + ] + ), + [ + ('Bud, Person', 'bperson@dom.ain'), + ('Al Person', 'aperson@dom.ain'), + ('Mariusz Felisiak', 'to@example.com'), + ], + ) + + def test_parsing_errors(self): + """Test for parsing errors from CVE-2023-27043 and CVE-2019-16056""" + alice = 'alice@example.org' + bob = 'bob@example.com' + empty = ('', '') + + # Test utils.getaddresses() and utils.parseaddr() on malformed email + # addresses: default behavior (strict=True) rejects malformed address, + # and strict=False which tolerates malformed address. + for invalid_separator, expected_non_strict in ( + ('(', [(f'<{bob}>', alice)]), + (')', [('', alice), empty, ('', bob)]), + ('<', [('', alice), empty, ('', bob), empty]), + ('>', [('', alice), empty, ('', bob)]), + ('[', [('', f'{alice}[<{bob}>]')]), + (']', [('', alice), empty, ('', bob)]), + ('@', [empty, empty, ('', bob)]), + (';', [('', alice), empty, ('', bob)]), + (':', [('', alice), ('', bob)]), + ('.', [('', alice + '.'), ('', bob)]), + ('"', [('', alice), ('', f'<{bob}>')]), + ): + address = f'{alice}{invalid_separator}<{bob}>' + with self.subTest(address=address): + self.assertEqual(utils.getaddresses([address]), + [empty]) + self.assertEqual(utils.getaddresses([address], strict=False), + expected_non_strict) + + self.assertEqual(utils.parseaddr([address]), + empty) + self.assertEqual(utils.parseaddr([address], strict=False), + ('', address)) + + # Comma (',') is treated differently depending on strict parameter. + # Comma without quotes. + address = f'{alice},<{bob}>' + self.assertEqual(utils.getaddresses([address]), + [('', alice), ('', bob)]) + self.assertEqual(utils.getaddresses([address], strict=False), + [('', alice), ('', bob)]) + self.assertEqual(utils.parseaddr([address]), + empty) + self.assertEqual(utils.parseaddr([address], strict=False), + ('', address)) + + # Real name between quotes containing comma. + address = '"Alice, alice@example.org" ' + expected_strict = ('Alice, alice@example.org', 'bob@example.com') + self.assertEqual(utils.getaddresses([address]), [expected_strict]) + self.assertEqual(utils.getaddresses([address], strict=False), [expected_strict]) + self.assertEqual(utils.parseaddr([address]), expected_strict) + self.assertEqual(utils.parseaddr([address], strict=False), + ('', address)) + + # Valid parenthesis in comments. + address = 'alice@example.org (Alice)' + expected_strict = ('Alice', 'alice@example.org') + self.assertEqual(utils.getaddresses([address]), [expected_strict]) + self.assertEqual(utils.getaddresses([address], strict=False), [expected_strict]) + self.assertEqual(utils.parseaddr([address]), expected_strict) + self.assertEqual(utils.parseaddr([address], strict=False), + ('', address)) + + # Invalid parenthesis in comments. + address = 'alice@example.org )Alice(' + self.assertEqual(utils.getaddresses([address]), [empty]) + self.assertEqual(utils.getaddresses([address], strict=False), + [('', 'alice@example.org'), ('', ''), ('', 'Alice')]) + self.assertEqual(utils.parseaddr([address]), empty) + self.assertEqual(utils.parseaddr([address], strict=False), + ('', address)) + + # Two addresses with quotes separated by comma. + address = '"Jane Doe" , "John Doe" ' + self.assertEqual(utils.getaddresses([address]), + [('Jane Doe', 'jane@example.net'), + ('John Doe', 'john@example.net')]) + self.assertEqual(utils.getaddresses([address], strict=False), + [('Jane Doe', 'jane@example.net'), + ('John Doe', 'john@example.net')]) + self.assertEqual(utils.parseaddr([address]), empty) + self.assertEqual(utils.parseaddr([address], strict=False), + ('', address)) + + # Test email.utils.supports_strict_parsing attribute + self.assertEqual(email.utils.supports_strict_parsing, True) + def test_getaddresses_nasty(self): - eq = self.assertEqual - eq(utils.getaddresses(['foo: ;']), [('', '')]) - eq(utils.getaddresses( - ['[]*-- =~$']), - [('', ''), ('', ''), ('', '*--')]) - eq(utils.getaddresses( - ['foo: ;', '"Jason R. Mastaler" ']), - [('', ''), ('Jason R. Mastaler', 'jason@dom.ain')]) + for addresses, expected in ( + (['"Sürname, Firstname" '], + [('Sürname, Firstname', 'to@example.com')]), + + (['foo: ;'], + [('', '')]), + + (['foo: ;', '"Jason R. Mastaler" '], + [('', ''), ('Jason R. Mastaler', 'jason@dom.ain')]), + + ([r'Pete(A nice \) chap) '], + [('Pete (A nice ) chap his account his host)', 'pete@silly.test')]), + + (['(Empty list)(start)Undisclosed recipients :(nobody(I know))'], + [('', '')]), + + (['Mary <@machine.tld:mary@example.net>, , jdoe@test . example'], + [('Mary', 'mary@example.net'), ('', ''), ('', 'jdoe@test.example')]), + + (['John Doe '], + [('John Doe (comment)', 'jdoe@machine.example')]), + + (['"Mary Smith: Personal Account" '], + [('Mary Smith: Personal Account', 'smith@home.example')]), + + (['Undisclosed recipients:;'], + [('', '')]), + + ([r', "Giant; \"Big\" Box" '], + [('', 'boss@nil.test'), ('Giant; "Big" Box', 'bob@example.net')]), + ): + with self.subTest(addresses=addresses): + self.assertEqual(utils.getaddresses(addresses), + expected) + self.assertEqual(utils.getaddresses(addresses, strict=False), + expected) + + addresses = ['[]*-- =~$'] + self.assertEqual(utils.getaddresses(addresses), + [('', '')]) + self.assertEqual(utils.getaddresses(addresses, strict=False), + [('', ''), ('', ''), ('', '*--')]) def test_getaddresses_embedded_comment(self): """Test proper handling of a nested comment""" @@ -3440,6 +3580,54 @@ def test_mime_classes_policy_argument(self): m = cls(*constructor, policy=email.policy.default) self.assertIs(m.policy, email.policy.default) + def test_iter_escaped_chars(self): + self.assertEqual(list(utils._iter_escaped_chars(r'a\\b\"c\\"d')), + [(0, 'a'), + (2, '\\\\'), + (3, 'b'), + (5, '\\"'), + (6, 'c'), + (8, '\\\\'), + (9, '"'), + (10, 'd')]) + self.assertEqual(list(utils._iter_escaped_chars('a\\')), + [(0, 'a'), (1, '\\')]) + + def test_strip_quoted_realnames(self): + def check(addr, expected): + self.assertEqual(utils._strip_quoted_realnames(addr), expected) + + check('"Jane Doe" , "John Doe" ', + ' , ') + check(r'"Jane \"Doe\"." ', + ' ') + + # special cases + check(r'before"name"after', 'beforeafter') + check(r'before"name"', 'before') + check(r'b"name"', 'b') # single char + check(r'"name"after', 'after') + check(r'"name"a', 'a') # single char + check(r'"name"', '') + + # no change + for addr in ( + 'Jane Doe , John Doe ', + 'lone " quote', + ): + self.assertEqual(utils._strip_quoted_realnames(addr), addr) + + + def test_check_parenthesis(self): + addr = 'alice@example.net' + self.assertTrue(utils._check_parenthesis(f'{addr} (Alice)')) + self.assertFalse(utils._check_parenthesis(f'{addr} )Alice(')) + self.assertFalse(utils._check_parenthesis(f'{addr} (Alice))')) + self.assertFalse(utils._check_parenthesis(f'{addr} ((Alice)')) + + # Ignore real name between quotes + self.assertTrue(utils._check_parenthesis(f'")Alice((" {addr}')) + # Test the iterator/generators class TestIterators(TestEmailBase): diff --git a/Misc/NEWS.d/next/Library/2023-10-20-15-28-08.gh-issue-102988.dStNO7.rst b/Misc/NEWS.d/next/Library/2023-10-20-15-28-08.gh-issue-102988.dStNO7.rst new file mode 100644 index 00000000000000..3d0e9e4078c934 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2023-10-20-15-28-08.gh-issue-102988.dStNO7.rst @@ -0,0 +1,8 @@ +:func:`email.utils.getaddresses` and :func:`email.utils.parseaddr` now +return ``('', '')`` 2-tuples in more situations where invalid email +addresses are encountered instead of potentially inaccurate values. Add +optional *strict* parameter to these two functions: use ``strict=False`` to +get the old behavior, accept malformed inputs. +``getattr(email.utils, 'supports_strict_parsing', False)`` can be use to check +if the *strict* paramater is available. Patch by Thomas Dwyer and Victor +Stinner to improve the CVE-2023-27043 fix.