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prevent unicode-confusion in password by applying PRECIS, and username/email address by applying unicode NFC normalization

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an é (e with accent) can also be written as e+\u0301. the first form is NFC,
the second NFD. when logging in, we transform usernames (email addresses) to
NFC. so both forms will be accepted. if a client is using NFD, they can log
in too.

for passwords, we apply the PRECIS "opaquestring", which (despite the name)
transforms the value too: unicode spaces are replaced with ascii spaces. the
string is also normalized to NFC. PRECIS may reject confusing passwords when
you set a password.
This commit is contained in:
Mechiel Lukkien
2024-03-08 23:29:15 +01:00
parent 8e6fe7459b
commit c57aeac7f0
99 changed files with 59625 additions and 114 deletions
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2
imapserver/unselect_test.go
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@ -10,7 +10,7 @@ func TestUnselect(t *testing.T) {
tc := start(t)
defer tc.close()
tc.client.Login("mjl@mox.example", "testtest")
tc.client.Login("mjl@mox.example", password0)
tc.client.Select("inbox")
tc.transactf("bad", "unselect bogus") // Leftover data.