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prevent unicode-confusion in password by applying PRECIS, and username/email address by applying unicode NFC normalization
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.
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3
main.go
3
main.go
@ -33,6 +33,7 @@ import (
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"time"
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"golang.org/x/crypto/bcrypt"
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"golang.org/x/text/secure/precis"
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"github.com/mjl-/adns"
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@ -1246,6 +1247,8 @@ The password is read from stdin. Its bcrypt hash is stored in a file named
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}
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pw := xreadpassword()
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pw, err := precis.OpaqueString.String(pw)
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xcheckf(err, `checking password with "precis" requirements`)
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hash, err := bcrypt.GenerateFromPassword([]byte(pw), bcrypt.DefaultCost)
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xcheckf(err, "generating hash for password")
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err = os.WriteFile(path, hash, 0660)
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