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implement limits on outgoing messages for an account

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by default 1000 messages per day, and to max 200 first-time receivers.
i don't think a person would reach those limits. a compromised account abused
by spammers could easily reach that limit. this prevents further damage.

the error message you will get is quite clear, pointing to the configuration
parameter that should be changed.
This commit is contained in:
Mechiel Lukkien
2023-03-28 20:50:36 +02:00
parent 9bd497b836
commit 9b57c69c1c
14 changed files with 262 additions and 4 deletions
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36
smtpserver/server_test.go
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@ -922,3 +922,39 @@ func TestNonSMTP(t *testing.T) {
t.Fatalf("connection not closed after bogus command")
}
}
// Test limits on outgoing messages.
func TestLimitOutgoing(t *testing.T) {
ts := newTestServer(t, "../testdata/smtp/sendlimit/mox.conf", dns.MockResolver{})
defer ts.close()
ts.user = "mjl@mox.example"
ts.pass = "testtest"
ts.submission = true
err := ts.acc.DB.Insert(&store.Outgoing{Recipient: "a@other.example", Submitted: time.Now().Add(-24*time.Hour - time.Minute)})
tcheck(t, err, "inserting outgoing/recipient past 24h window")
testSubmit := func(rcptTo string, expErr *smtpclient.Error) {
t.Helper()
ts.run(func(err error, client *smtpclient.Client) {
t.Helper()
mailFrom := "mjl@mox.example"
if err == nil {
err = client.Deliver(context.Background(), mailFrom, rcptTo, int64(len(submitMessage)), strings.NewReader(submitMessage), false, false)
}
var cerr smtpclient.Error
if expErr == nil && err != nil || expErr != nil && (err == nil || !errors.As(err, &cerr) || cerr.Secode != expErr.Secode) {
t.Fatalf("got err %#v, expected %#v", err, expErr)
}
})
}
// Limits are set to 4 messages a day, 2 first-time recipients.
testSubmit("b@other.example", nil)
testSubmit("c@other.example", nil)
testSubmit("d@other.example", &smtpclient.Error{Code: smtp.C451LocalErr, Secode: smtp.SePol7DeliveryUnauth1}) // Would be 3rd recipient.
testSubmit("b@other.example", nil)
testSubmit("b@other.example", nil)
testSubmit("b@other.example", &smtpclient.Error{Code: smtp.C451LocalErr, Secode: smtp.SePol7DeliveryUnauth1}) // Would be 5th message.
}