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Proxy protocol support for SMTP and IMAP
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| package proxy_protocol | ||
|
|
||
| import ( | ||
| "crypto/tls" | ||
| "net" | ||
| "strings" | ||
|
|
||
| "github.com/c0va23/go-proxyprotocol" | ||
| "github.com/foxcpp/maddy/framework/config" | ||
| tls2 "github.com/foxcpp/maddy/framework/config/tls" | ||
| "github.com/foxcpp/maddy/framework/log" | ||
| ) | ||
|
|
||
| type ProxyProtocol struct { | ||
| trust []net.IPNet | ||
| tlsConfig *tls.Config | ||
| } | ||
|
|
||
| func ProxyProtocolDirective(_ *config.Map, node config.Node) (interface{}, error) { | ||
| p := ProxyProtocol{} | ||
|
|
||
| childM := config.NewMap(nil, node) | ||
| var trustList []string | ||
|
|
||
| childM.StringList("trust", false, false, nil, &trustList) | ||
| childM.Custom("tls", true, false, nil, tls2.TLSDirective, &p.tlsConfig) | ||
|
|
||
| if _, err := childM.Process(); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if len(node.Args) > 0 { | ||
| if trustList == nil { | ||
| trustList = make([]string, 0) | ||
| } | ||
| trustList = append(trustList, node.Args...) | ||
| } | ||
|
|
||
| for _, trust := range trustList { | ||
| if !strings.Contains(trust, "/") { | ||
| trust += "/32" | ||
| } | ||
| _, ipNet, err := net.ParseCIDR(trust) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| p.trust = append(p.trust, *ipNet) | ||
| } | ||
|
|
||
| return &p, nil | ||
| } | ||
|
|
||
| func NewListener(inner net.Listener, p *ProxyProtocol, logger log.Logger) net.Listener { | ||
| var listener net.Listener | ||
|
|
||
| sourceChecker := func(upstream net.Addr) (bool, error) { | ||
| if tcpAddr, ok := upstream.(*net.TCPAddr); ok { | ||
| if len(p.trust) == 0 { | ||
| return true, nil | ||
| } | ||
| for _, trusted := range p.trust { | ||
| if trusted.Contains(tcpAddr.IP) { | ||
| return true, nil | ||
| } | ||
| } | ||
| } else if _, ok := upstream.(*net.UnixAddr); ok { | ||
| // UNIX local socket connection, always trusted | ||
| return true, nil | ||
| } | ||
|
|
||
| logger.Printf("proxy_protocol: connection from untrusted source %s", upstream) | ||
| return false, nil | ||
| } | ||
|
|
||
| listener = proxyprotocol.NewDefaultListener(inner). | ||
| WithLogger(proxyprotocol.LoggerFunc(func(format string, v ...interface{}) { | ||
| logger.Debugf("proxy_protocol: "+format, v...) | ||
| })). | ||
| WithSourceChecker(sourceChecker) | ||
|
|
||
| if p.tlsConfig != nil { | ||
| listener = tls.NewListener(listener, p.tlsConfig) | ||
| } | ||
|
|
||
| return listener | ||
| } |
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