package auth import ( "context" "fmt" "net/http" "net/url" "strings" goauth "github.com/abbot/go-http-auth" "github.com/containous/traefik/v2/pkg/config/dynamic" "github.com/containous/traefik/v2/pkg/log" "github.com/containous/traefik/v2/pkg/middlewares" "github.com/containous/traefik/v2/pkg/middlewares/accesslog" "github.com/containous/traefik/v2/pkg/tracing" "github.com/opentracing/opentracing-go/ext" ) const ( basicTypeName = "BasicAuth" ) type basicAuth struct { next http.Handler auth *goauth.BasicAuth users map[string]string headerField string removeHeader bool name string } // NewBasic creates a basicAuth middleware. func NewBasic(ctx context.Context, next http.Handler, authConfig dynamic.BasicAuth, name string) (http.Handler, error) { log.FromContext(middlewares.GetLoggerCtx(ctx, name, basicTypeName)).Debug("Creating middleware") users, err := getUsers(authConfig.UsersFile, authConfig.Users, basicUserParser) if err != nil { return nil, err } ba := &basicAuth{ next: next, users: users, headerField: authConfig.HeaderField, removeHeader: authConfig.RemoveHeader, name: name, } realm := defaultRealm if len(authConfig.Realm) > 0 { realm = authConfig.Realm } ba.auth = goauth.NewBasicAuthenticator(realm, ba.secretBasic) return ba, nil } func (b *basicAuth) GetTracingInformation() (string, ext.SpanKindEnum) { return b.name, tracing.SpanKindNoneEnum } func (b *basicAuth) ServeHTTP(rw http.ResponseWriter, req *http.Request) { logger := log.FromContext(middlewares.GetLoggerCtx(req.Context(), b.name, basicTypeName)) if username := b.auth.CheckAuth(req); username == "" { logger.Debug("Authentication failed") tracing.SetErrorWithEvent(req, "Authentication failed") b.auth.RequireAuth(rw, req) } else { logger.Debug("Authentication succeeded") req.URL.User = url.User(username) logData := accesslog.GetLogData(req) if logData != nil { logData.Core[accesslog.ClientUsername] = username } if b.headerField != "" { req.Header[b.headerField] = []string{username} } if b.removeHeader { logger.Debug("Removing authorization header") req.Header.Del(authorizationHeader) } b.next.ServeHTTP(rw, req) } } func (b *basicAuth) secretBasic(user, realm string) string { if secret, ok := b.users[user]; ok { return secret } return "" } func basicUserParser(user string) (string, string, error) { split := strings.Split(user, ":") if len(split) != 2 { return "", "", fmt.Errorf("error parsing BasicUser: %v", user) } return split[0], split[1], nil }