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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| // The contents of this files are modified libraris from the Go standard library. | ||
| // The original code can be found at https://cs.opensource.google/go/go/+/refs/tags/go1.22.2:src/net/smtp/smtp.go;l=321 | ||
| // | ||
| // Copyright belongs to the Go authors. | ||
| package notifications | ||
|
|
||
| import ( | ||
| "crypto/tls" | ||
| "errors" | ||
| "fmt" | ||
| "net" | ||
| "net/smtp" | ||
| "strings" | ||
| ) | ||
|
|
||
| const TLSPort = 465 | ||
|
|
||
| func validateLine(line string) error { | ||
| if strings.ContainsAny(line, "\n\r") { | ||
| return errors.New("smtp: A line must not contain CR or LF") //nolint | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func sendMail( //nolint:funlen,cyclop | ||
| host string, | ||
| port uint16, | ||
| useTLSConnection bool, | ||
| a smtp.Auth, | ||
| from string, | ||
| to []string, | ||
| msg []byte, | ||
| ) error { | ||
| if err := validateLine(from); err != nil { | ||
| return err | ||
| } | ||
| for _, recp := range to { | ||
| if err := validateLine(recp); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| addr := fmt.Sprintf("%s:%d", host, port) | ||
| var conn net.Conn | ||
| var err error | ||
| if useTLSConnection { | ||
| tlsconfig := &tls.Config{ //nolint:gosec,exhaustruct | ||
| InsecureSkipVerify: false, | ||
| ServerName: host, | ||
| } | ||
|
|
||
| conn, err = tls.Dial("tcp", addr, tlsconfig) | ||
| if err != nil { | ||
| return err //nolint:wrapcheck | ||
| } | ||
| } else { | ||
| conn, err = net.Dial("tcp", addr) | ||
| if err != nil { | ||
| return err //nolint:wrapcheck | ||
| } | ||
| } | ||
|
|
||
| c, err := smtp.NewClient(conn, host) | ||
| if err != nil { | ||
| return err //nolint:wrapcheck | ||
| } | ||
| defer c.Close() | ||
|
|
||
| if err = c.Hello("hasura-auth"); err != nil { | ||
| return err //nolint:wrapcheck | ||
| } | ||
| if ok, _ := c.Extension("STARTTLS"); ok { | ||
| config := &tls.Config{ServerName: addr} //nolint:gosec,exhaustruct | ||
| if err = c.StartTLS(config); err != nil { | ||
| return err //nolint:wrapcheck | ||
| } | ||
| } | ||
|
|
||
| if err = c.Auth(a); err != nil { | ||
| return err //nolint:wrapcheck | ||
| } | ||
|
|
||
| if err = c.Mail(from); err != nil { | ||
| return err //nolint:wrapcheck | ||
| } | ||
| for _, addr := range to { | ||
| if err = c.Rcpt(addr); err != nil { | ||
| return err //nolint:wrapcheck | ||
| } | ||
| } | ||
| w, err := c.Data() | ||
| if err != nil { | ||
| return err //nolint:wrapcheck | ||
| } | ||
| _, err = w.Write(msg) | ||
| if err != nil { | ||
| return err //nolint:wrapcheck | ||
| } | ||
| err = w.Close() | ||
| if err != nil { | ||
| return err //nolint:wrapcheck | ||
| } | ||
| return c.Quit() //nolint:wrapcheck | ||
| } | ||
|
|
||
| // This is a copy of the smtp.PlainAuth function from the Go standard library. | ||
| // It is copied here because we want to allow mailhog to be used as a mail server | ||
| // without requiring TLS. The standard library's smtp.PlainAuth function requires | ||
| // TLS to be enabled unless the server is localhost. | ||
| // | ||
| // Copyright belongs to the Go authors. | ||
| type plainAuth struct { | ||
| identity, username, password string | ||
| host string | ||
| } | ||
|
|
||
| func PlainAuth(identity, username, password, host string) smtp.Auth { | ||
| return &plainAuth{identity, username, password, host} | ||
| } | ||
|
|
||
| func isLocalhost(name string) bool { | ||
| return name == "mailhog" || name == "localhost" || name == "127.0.0.1" || name == "::1" | ||
| } | ||
|
|
||
| func (a *plainAuth) Start(server *smtp.ServerInfo) (string, []byte, error) { | ||
| // Must have TLS, or else localhost server. | ||
| // Note: If TLS is not true, then we can't trust ANYTHING in ServerInfo. | ||
| // In particular, it doesn't matter if the server advertises PLAIN auth. | ||
| // That might just be the attacker saying | ||
| // "it's ok, you can trust me with your password." | ||
| if !server.TLS && !isLocalhost(server.Name) { | ||
| return "", nil, errors.New("unencrypted connection") //nolint:goerr113 | ||
| } | ||
| if server.Name != a.host { | ||
| return "", nil, errors.New("wrong host name") //nolint:goerr113 | ||
| } | ||
| resp := []byte(a.identity + "\x00" + a.username + "\x00" + a.password) | ||
| return "PLAIN", resp, nil | ||
| } | ||
|
|
||
| func (a *plainAuth) Next(_ []byte, more bool) ([]byte, error) { | ||
| if more { | ||
| // We've already sent everything. | ||
| return nil, errors.New("unexpected server challenge") //nolint:goerr113 | ||
| } | ||
| return nil, nil | ||
| } |