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for the smtp login method, use challenges "Username:" and "Password:" as attempt to improve interoperability

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there is only an internet-draft about the required behaviour. it says clients
should ignore the strings. some clients do check the string. most servers
appear to use "Username:" and "Password:" as challenge. we'll follow them,
hoping to improve interoperability.

for issue #223 by gdunstone, and with analysis from wneessen of go-mail.
thanks!
This commit is contained in:
Mechiel Lukkien 2024-10-03 20:29:40 +02:00
parent bbc419c6ab
commit 7ecc3f68ce
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1 changed files with 4 additions and 3 deletions
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7
smtpserver/server.go
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@ -1136,16 +1136,17 @@ func (c *conn) cmdAuth(p *parser) {
// Read user name. The I-D says the client should ignore the server challenge, but
// also that some clients may require challenge "Username:" instead of "User
// Name". We can't sent both...
// Name". We can't sent both... Servers most commonly return "Username:" and
// "Password:", so we do the same.
// I-D says maximum length must be 64 bytes. We allow more, for long user names
// (domains).
encChal := base64.StdEncoding.EncodeToString([]byte("User Name"))
encChal := base64.StdEncoding.EncodeToString([]byte("Username:"))
username := string(xreadInitial(encChal))
username = norm.NFC.String(username)
// Again, client should ignore the challenge, we send the same as the example in
// the I-D.
c.writelinef("%d %s", smtp.C334ContinueAuth, base64.StdEncoding.EncodeToString([]byte("Password")))
c.writelinef("%d %s", smtp.C334ContinueAuth, base64.StdEncoding.EncodeToString([]byte("Password:")))
// Password is in line in plain text, so hide it.
defer c.xtrace(mlog.LevelTraceauth)()