63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
package ipallowlist
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
|
|
"github.com/traefik/traefik/v2/pkg/config/dynamic"
|
|
"github.com/traefik/traefik/v2/pkg/ip"
|
|
"github.com/traefik/traefik/v2/pkg/middlewares"
|
|
"github.com/traefik/traefik/v2/pkg/tcp"
|
|
)
|
|
|
|
const (
|
|
typeName = "IPAllowListerTCP"
|
|
)
|
|
|
|
// ipAllowLister is a middleware that provides Checks of the Requesting IP against a set of Allowlists.
|
|
type ipAllowLister struct {
|
|
next tcp.Handler
|
|
allowLister *ip.Checker
|
|
name string
|
|
}
|
|
|
|
// New builds a new TCP IPAllowLister given a list of CIDR-Strings to allow.
|
|
func New(ctx context.Context, next tcp.Handler, config dynamic.TCPIPAllowList, name string) (tcp.Handler, error) {
|
|
logger := middlewares.GetLogger(ctx, name, typeName)
|
|
logger.Debug().Msg("Creating middleware")
|
|
|
|
if len(config.SourceRange) == 0 {
|
|
return nil, errors.New("sourceRange is empty, IPAllowLister not created")
|
|
}
|
|
|
|
checker, err := ip.NewChecker(config.SourceRange)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot parse CIDRs %s: %w", config.SourceRange, err)
|
|
}
|
|
|
|
logger.Debug().Msgf("Setting up IPAllowLister with sourceRange: %s", config.SourceRange)
|
|
|
|
return &ipAllowLister{
|
|
allowLister: checker,
|
|
next: next,
|
|
name: name,
|
|
}, nil
|
|
}
|
|
|
|
func (al *ipAllowLister) ServeTCP(conn tcp.WriteCloser) {
|
|
logger := middlewares.GetLogger(context.Background(), al.name, typeName)
|
|
|
|
addr := conn.RemoteAddr().String()
|
|
|
|
err := al.allowLister.IsAuthorized(addr)
|
|
if err != nil {
|
|
logger.Error().Err(err).Msgf("Connection from %s rejected", addr)
|
|
conn.Close()
|
|
return
|
|
}
|
|
|
|
logger.Debug().Msgf("Connection from %s accepted", addr)
|
|
|
|
al.next.ServeTCP(conn)
|
|
}
|