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support cram-md5 authentication for imap and smtp

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and change thunderbird autoconfiguration to use it.

unfortunately, for microsoft autodiscover, there appears to be no way to
request secure password negotiation. so it will default to plain text auth.

cram-md5 is less secure than scram-sha-*, but thunderbird does not yet support
scram auth. it currently chooses "plain", sending the literal password over the
connection (which is TLS-protected, but we don't want to receive clear text
passwords). in short, cram-md5 is better than nothing...

for cram-md5 to work, a new set of derived credentials need to be stored in the
database. so you need to save your password again to make it work. this was
also the case with the scram-sha-1 addition, but i forgot to mention it then.
This commit is contained in:
Mechiel Lukkien
2023-02-05 16:29:03 +01:00
parent f83fe79f96
commit e52c9d36a6
9 changed files with 306 additions and 22 deletions
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2
metrics/auth.go
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@ -13,7 +13,7 @@ var (
},
[]string{
"kind", // submission, imap, httpaccount, httpadmin
"variant", // login, plain, scram-sha-256, httpbasic
"variant", // login, plain, scram-sha-256, scram-sha-1, cram-md5, httpbasic
// todo: we currently only use badcreds, but known baduser can be helpful
"result", // ok, baduser, badpassword, badcreds, error, aborted
},