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Allow numbers in usernames #224

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Allow numbers in usernames #224

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77dd0e4
Allow numbers in usernames
ja5087 Oct 9, 2020
fe06b66
Enforce first character lowercase
ja5087 Oct 10, 2020
ae66b47
Add back all numeric bad case
ja5087 Oct 10, 2020
0083f29
Allow usernames with numbers
ja5087 Oct 10, 2020
3adda0e
Make regex more strict
ja5087 Oct 14, 2020
8264faa
I can't add
ja5087 Oct 14, 2020
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2 changes: 1 addition & 1 deletion ocflib/account/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,7 @@ def extract_username_from_principal(principal):
'ckuehl'
"""

REGEX = '^([a-z]{3,16})(/[a-z]*)?@OCF\\.BERKELEY\\.EDU$'
REGEX = '^([a-z][a-z0-9]{2,15})(/[a-z]*)?@OCF\\.BERKELEY\\.EDU$'
match = re.match(REGEX, principal)

if not match:
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7 changes: 5 additions & 2 deletions ocflib/account/validators.py
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Original file line number Diff line number Diff line change
Expand Up @@ -344,8 +344,11 @@ def validate_username(username, check_exists=False):
if not 3 <= len(username) <= 16:
raise ValueError('Username must be between 3 and 16 characters.')

if not all(c.islower() for c in username):
raise ValueError('Username must be all lowercase letters.')
if not username[0].islower():
raise ValueError('Username must begin with a lowercase character')

if not all(c.islower() or c.isdigit() for c in username):
raise ValueError('Username must be only lowercase and numeric characters.')

if check_exists and not user_exists(username):
raise ValueError('Username does not exist.')
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1 change: 0 additions & 1 deletion tests/account/validators_test.py
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Expand Up @@ -26,7 +26,6 @@ class TestValidateUsername:
'Ckuehl',
'ckuehl!',
'123123',
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@PotatoParser PotatoParser Oct 12, 2020 •
edited
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Would this be valid since the regex selects 3-16 digits/lowercase nums?

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It's not valid because the validation logic comes from validate_username. You're right that the regex is lax and I don't really know how to feel about it. On the one hand Kerberos principals can be any printable ASCII so there is nothing stopping us from creating 000@OCF.BERKELEY.EDU for example, and the method's purpose is to extract that out.

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Is the goal of the regex to handle any arbitrary Kerberos principal, or only those which correspond to valid usernames? I must point out that the regex as written won't match hypothetical Kerberos principals which are longer than 16 characters, have hyphens in them, or the like.

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That's fair. I think making it tighter and in line with what we allow will be better than in this weird state of not doing either.

'f00f00',
])
def test_failure(self, username):
with pytest.raises(ValueError):
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