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normalize localparts with unicode nfc when parsing

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both when parsing our configs, and for incoming on smtp or in messages.
so we properly compare things like é and e+accent as equal, and accept the
different encodings of that same address.
This commit is contained in:
Mechiel Lukkien
2024-03-08 21:08:40 +01:00
parent 4fbd7abb57
commit 8e6fe7459b
23 changed files with 134 additions and 59 deletions
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5
smtp/address.go
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@ -6,6 +6,8 @@ import (
"strconv"
"strings"
"golang.org/x/text/unicode/norm"
"github.com/mjl-/mox/dns"
)
@ -17,6 +19,7 @@ var ErrBadAddress = errors.New("invalid email address")
// Localpart is a decoded local part of an email address, before the "@".
// For quoted strings, values do not hold the double quote or escaping backslashes.
// An empty string can be a valid localpart.
// Localparts are in Unicode NFC.
type Localpart string
// String returns a packed representation of an address, with proper escaping/quoting, for use in SMTP.
@ -268,7 +271,7 @@ func (p *parser) xlocalpart() Localpart {
// ../rfc/5321:3486
p.xerrorf("localpart longer than 64 octets")
}
return Localpart(s)
return Localpart(norm.NFC.String(s))
}
func (p *parser) xquotedString() string {