66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
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package tcpipwhitelist
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import (
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"context"
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"errors"
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"fmt"
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"github.com/traefik/traefik/v2/pkg/config/dynamic"
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"github.com/traefik/traefik/v2/pkg/ip"
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"github.com/traefik/traefik/v2/pkg/log"
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"github.com/traefik/traefik/v2/pkg/middlewares"
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"github.com/traefik/traefik/v2/pkg/tcp"
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)
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const (
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typeName = "IPWhiteListerTCP"
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)
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// ipWhiteLister is a middleware that provides Checks of the Requesting IP against a set of Whitelists.
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type ipWhiteLister struct {
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next tcp.Handler
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whiteLister *ip.Checker
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name string
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}
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// New builds a new TCP IPWhiteLister given a list of CIDR-Strings to whitelist.
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func New(ctx context.Context, next tcp.Handler, config dynamic.TCPIPWhiteList, name string) (tcp.Handler, error) {
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logger := log.FromContext(middlewares.GetLoggerCtx(ctx, name, typeName))
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logger.Debug("Creating middleware")
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if len(config.SourceRange) == 0 {
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return nil, errors.New("sourceRange is empty, IPWhiteLister not created")
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}
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checker, err := ip.NewChecker(config.SourceRange)
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if err != nil {
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return nil, fmt.Errorf("cannot parse CIDR whitelist %s: %w", config.SourceRange, err)
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}
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logger.Debugf("Setting up IPWhiteLister with sourceRange: %s", config.SourceRange)
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return &ipWhiteLister{
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whiteLister: checker,
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next: next,
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name: name,
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}, nil
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}
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func (wl *ipWhiteLister) ServeTCP(conn tcp.WriteCloser) {
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ctx := middlewares.GetLoggerCtx(context.Background(), wl.name, typeName)
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logger := log.FromContext(ctx)
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addr := conn.RemoteAddr().String()
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err := wl.whiteLister.IsAuthorized(addr)
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if err != nil {
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logger.Errorf("Connection from %s rejected: %v", addr, err)
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conn.Close()
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return
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}
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logger.Debugf("Connection from %s accepted", addr)
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wl.next.ServeTCP(conn)
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}
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