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feat: support optional SMTP auth #14533

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Merged
merged 2 commits into from
Sep 3, 2024
Merged

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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Be more explicit about no auth 
Signed-off-by: Danny Kopping <danny@coder.com>
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@dannykopping
dannykopping committed Sep 3, 2024
commit f7fcaf92a18ce822cdfba8b8f84f9857a80951ae
15 changes: 9 additions & 6 deletions coderd/notifications/dispatch/smtp.go
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Original file line number Diff line number Diff line change
Expand Up @@ -137,14 +137,20 @@ func (s *SMTPHandler) dispatch(subject, htmlBody, plainBody, to string) Delivery

// Check for authentication capabilities.
if ok, avail := c.Extension("AUTH"); ok {
// Ensure the auth mechanisms available are ones we can use.
// Ensure the auth mechanisms available are ones we can use, and create a SASL client.
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 {
if auth == nil {
// If we get here, no SASL client (which handles authentication) was returned.
// This is expected if auth is supported by the smarthost BUT no authentication details were configured.
s.noAuthWarnOnce.Do(func() {
s.log.Warn(ctx, "skipping auth; no authentication client created")
})
} else {
// We have a SASL client, use it to authenticate.
if err := c.Auth(auth); err != nil {
return true, xerrors.Errorf("%T auth: %w", auth, err)
}
Expand Down Expand Up @@ -434,9 +440,6 @@ func (s *SMTPHandler) auth(ctx context.Context, mechs string) (sasl.Client, erro

// 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.

}
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