64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
package ipallowlist
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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/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 = "IPAllowListerTCP"
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)
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// ipAllowLister is a middleware that provides Checks of the Requesting IP against a set of Allowlists.
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type ipAllowLister struct {
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next tcp.Handler
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allowLister *ip.Checker
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name string
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}
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// New builds a new TCP IPAllowLister given a list of CIDR-Strings to allow.
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func New(ctx context.Context, next tcp.Handler, config dynamic.TCPIPAllowList, name string) (tcp.Handler, error) {
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logger := middlewares.GetLogger(ctx, name, typeName)
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logger.Debug().Msg("Creating middleware")
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if len(config.SourceRange) == 0 {
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return nil, errors.New("sourceRange is empty, IPAllowLister 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 CIDRs %s: %w", config.SourceRange, err)
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}
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logger.Debug().Msgf("Setting up IPAllowLister with sourceRange: %s", config.SourceRange)
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return &ipAllowLister{
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allowLister: 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 (al *ipAllowLister) ServeTCP(conn tcp.WriteCloser) {
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logger := middlewares.GetLogger(context.Background(), al.name, typeName)
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addr := conn.RemoteAddr().String()
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err := al.allowLister.IsAuthorized(addr)
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if err != nil {
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logger.Error().Err(err).Msgf("Connection from %s rejected", addr)
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conn.Close()
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return
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}
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logger.Debug().Msgf("Connection from %s accepted", addr)
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al.next.ServeTCP(conn)
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}
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