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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
webauth/webauth.go
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@ -266,7 +266,7 @@ func Login(ctx context.Context, log mlog.Log, sessionAuth SessionAuth, kind, coo
// We don't set a max-age. These makes cookies per-session. Browsers are rarely
// restarted nowadays, and they have "continue where you left off", keeping session
// cookies. Our sessions are only valid for max 1 day. Convenience can come from
// the browser remember the password.
// the browser remembering the password.
})
// Remove cookie used during login.
http.SetCookie(w, &http.Cookie{