package auth import ( "context" "fmt" "net/http" "net/url" "strings" goauth "github.com/abbot/go-http-auth" "github.com/traefik/traefik/v3/pkg/config/dynamic" "github.com/traefik/traefik/v3/pkg/middlewares" "github.com/traefik/traefik/v3/pkg/middlewares/accesslog" "github.com/traefik/traefik/v3/pkg/middlewares/observability" "go.opentelemetry.io/otel/trace" ) const ( typeNameDigest = "digestAuth" ) type digestAuth struct { next http.Handler auth *goauth.DigestAuth users map[string]string headerField string removeHeader bool name string } // NewDigest creates a digest auth middleware. func NewDigest(ctx context.Context, next http.Handler, authConfig dynamic.DigestAuth, name string) (http.Handler, error) { middlewares.GetLogger(ctx, name, typeNameDigest).Debug().Msg("Creating middleware") users, err := getUsers(authConfig.UsersFile, authConfig.Users, digestUserParser) if err != nil { return nil, err } da := &digestAuth{ next: next, users: users, headerField: authConfig.HeaderField, removeHeader: authConfig.RemoveHeader, name: name, } realm := defaultRealm if len(authConfig.Realm) > 0 { realm = authConfig.Realm } da.auth = goauth.NewDigestAuthenticator(realm, da.secretDigest) return da, nil } func (d *digestAuth) GetTracingInformation() (string, string, trace.SpanKind) { return d.name, typeNameDigest, trace.SpanKindInternal } func (d *digestAuth) ServeHTTP(rw http.ResponseWriter, req *http.Request) { logger := middlewares.GetLogger(req.Context(), d.name, typeNameDigest) username, authinfo := d.auth.CheckAuth(req) if username == "" { headerField := d.headerField if d.headerField == "" { headerField = "Authorization" } auth := goauth.DigestAuthParams(req.Header.Get(headerField)) if auth["username"] != "" { logData := accesslog.GetLogData(req) if logData != nil { logData.Core[accesslog.ClientUsername] = auth["username"] } } if authinfo != nil && *authinfo == "stale" { logger.Debug().Msg("Digest authentication failed, possibly because out of order requests") observability.SetStatusErrorf(req.Context(), "Digest authentication failed, possibly because out of order requests") d.auth.RequireAuthStale(rw, req) return } logger.Debug().Msg("Digest authentication failed") observability.SetStatusErrorf(req.Context(), "Digest authentication failed") d.auth.RequireAuth(rw, req) return } logger.Debug().Msg("Digest authentication succeeded") req.URL.User = url.User(username) logData := accesslog.GetLogData(req) if logData != nil { logData.Core[accesslog.ClientUsername] = username } if d.headerField != "" { req.Header[d.headerField] = []string{username} } if d.removeHeader { logger.Debug().Msg("Removing the Authorization header") req.Header.Del(authorizationHeader) } d.next.ServeHTTP(rw, req) } func (d *digestAuth) secretDigest(user, realm string) string { if secret, ok := d.users[user+":"+realm]; ok { return secret } return "" } func digestUserParser(user string) (string, string, error) { split := strings.Split(user, ":") if len(split) != 3 { return "", "", fmt.Errorf("error parsing DigestUser: %v", user) } return split[0] + ":" + split[1], split[2], nil }