8000 feat: support optional SMTP auth by dannykopping · Pull Request #14533 · coder/coder · GitHub
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feat: support optional SMTP auth #14533

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Merged
merged 2 commits into from
Sep 3, 2024
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feat: support optional SMTP auth #14533

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da550f4
feat: support optional SMTP auth
dannykopping Sep 3, 2024
f7fcaf9
Be more explicit about no auth
dannykopping Sep 3, 2024
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feat: support optional SMTP auth 
Signed-off-by: Danny Kopping <danny@coder.com>
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@dannykopping
dannykopping committed Sep 3, 2024
commit da550f4bcacad80a592ce3d45f48e4d1d7ea16c6
12 changes: 11 additions & 1 deletion coderd/notifications/dispatch/smtp.go
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Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,8 @@ type SMTPHandler struct {
cfg codersdk.NotificationsEmailConfig
log slog.Logger

loginWarnOnce sync.Once
noAuthWarnOnce sync.Once
loginWarnOnce sync.Once

helpers template.FuncMap
}
Expand Down Expand Up @@ -431,6 +432,15 @@ func (s *SMTPHandler) loadCertificate() (*tls.Certificate, error) {
func (s *SMTPHandler) auth(ctx context.Context, mechs string) (sasl.Client, error) {
username := s.cfg.Auth.Username.String()

// All auth mechanisms require username, so if one is not defined then don't return an auth client.
if username == "" {
s.noAuthWarnOnce.Do(func() {
s.log.Warn(ctx, "skipping auth; no username configured", slog.F("support_mechanisms", mechs))
})
// nolint:nilnil // This is a valid response.
return nil, nil
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@mafredri mafredri Sep 3, 2024 •
edited
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Is the new return signature handled by the caller(s)? I see that nilnil is new (unless sasl lib also returns it).

Edit: Might be good to mention this return signature in the function comment as well.

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Yup.

		// Check for authentication capabilities.
		if ok, avail := c.Extension("AUTH"); ok { <--- enters if auth is supported
			// Ensure the auth mechanisms available are ones we can use.
			auth, err := s.auth(ctx, avail)
			if err != nil {
				return true, xerrors.Errorf("determine auth mechanism: %w", err)
			}

			// If so, use the auth mechanism to authenticate.
			if auth != nil { <--- bails out because auth is nil
				if err := c.Auth(auth); err != nil {
					return true, xerrors.Errorf("%T auth: %w", auth, err)
				}
			}
		} else if !s.cfg.Auth.Empty() {
			return false, xerrors.New("no authentication mechanisms supported by server")
		}

		<--- ... continues to process message without auth ...

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Admittedly the comments could be better about this case, lemme add that.

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See f7fcaf9 @mafredri, thanks for the prompt.

}

var errs error
list := strings.Split(mechs, " ")
for _, mech := range list {
Expand Down
11 changes: 10 additions & 1 deletion coderd/notifications/dispatch/smtp_test.go
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Expand Up @@ -203,7 +203,6 @@ func TestSMTP(t *testing.T) {
retryable: false,
},
{
// No auth, no problem!
name: "No auth mechanisms supported, none configured",
authMechs: []string{},
cfg: codersdk.NotificationsEmailConfig{
Expand All @@ -213,6 +212,16 @@ func TestSMTP(t *testing.T) {
toAddrs: []string{to},
expectedAuthMeth: "",
},
{
name: "Auth mechanisms supported optionally, none configured",
authMechs: []string{sasl.Login, sasl.Plain},
cfg: codersdk.NotificationsEmailConfig{
Hello: hello,
From: from,
},
toAddrs: []string{to},
expectedAuthMeth: "",
},
/**
* TLS connections
*/
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