mirror of
https://github.com/shadow1ng/fscan.git
synced 2026-09-23 19:51:52 +08:00
- detector.go: 修复 AutoConfigureProxy 覆盖探测结果的问题 只有未探测过时才设置默认 proxyReliable 值 - port_scan.go: 改进深度验证机制 - 使用带 Host header 的 HTTP GET 请求替代 OPTIONS - 延长响应等待超时至 2s 以适配慢速服务器 - 正确重置连接 deadline 避免影响后续操作
643 lines
18 KiB
Go
643 lines
18 KiB
Go
package core
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import (
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"fmt"
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"math"
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"net"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/shadow1ng/fscan/common"
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"github.com/shadow1ng/fscan/common/i18n"
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"github.com/shadow1ng/fscan/common/output"
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"github.com/shadow1ng/fscan/common/parsers"
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)
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// proxyFailurePatterns 代理连接失败的错误模式(小写)
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var proxyFailurePatterns = []string{
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"connection reset by peer",
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"connection refused",
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"no route to host",
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"network is unreachable",
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"host is unreachable",
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"general socks server failure",
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"connection not allowed",
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"host unreachable",
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"network unreachable",
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"connection refused by destination host",
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}
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// resourceExhaustedPatterns 资源耗尽类错误模式
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var resourceExhaustedPatterns = []string{
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"too many open files",
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"no buffer space available",
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"cannot assign requested address",
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"connection reset by peer",
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"发包受限",
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}
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// resultCollector 结果收集器,用于并发安全地收集扫描结果
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// 使用 map 实现:O(1) 的添加和删除,无顺序依赖问题
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type resultCollector struct {
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mu sync.Mutex
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addrs map[string]struct{}
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}
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// newResultCollector 创建结果收集器
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func newResultCollector() *resultCollector {
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return &resultCollector{
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addrs: make(map[string]struct{}),
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}
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}
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// Add 添加一个扫描结果
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func (c *resultCollector) Add(addr string) {
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c.mu.Lock()
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c.addrs[addr] = struct{}{}
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c.mu.Unlock()
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}
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// GetAll 获取所有结果
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func (c *resultCollector) GetAll() []string {
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c.mu.Lock()
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result := make([]string, 0, len(c.addrs))
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for addr := range c.addrs {
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result = append(result, addr)
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}
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c.mu.Unlock()
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return result
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}
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// portScanTask 端口扫描任务(轻量级,用于滑动窗口调度)
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type portScanTask struct {
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host string
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port int
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semaphore chan struct{} // 完成时释放窗口槽位
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}
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// failedPortInfo 失败端口信息
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type failedPortInfo struct {
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Host string
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Port int
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Addr string
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}
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// failedPortCollector 失败端口收集器,用于记录需要重扫的端口
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type failedPortCollector struct {
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mu sync.Mutex
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ports []failedPortInfo
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}
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// Add 添加失败的端口
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func (f *failedPortCollector) Add(host string, port int, addr string) {
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f.mu.Lock()
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f.ports = append(f.ports, failedPortInfo{
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Host: host,
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Port: port,
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Addr: addr,
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})
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f.mu.Unlock()
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}
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// Count 获取失败端口数量
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func (f *failedPortCollector) Count() int {
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f.mu.Lock()
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count := len(f.ports)
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f.mu.Unlock()
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return count
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}
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// estimateScanTime 估算扫描时间
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// 参数: totalTasks - 总任务数, threads - 线程数, timeout - 超时时间(秒)
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// 返回: 估算的扫描时间(秒)
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func estimateScanTime(totalTasks int, threads int, timeout int64) int64 {
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if totalTasks == 0 || threads == 0 {
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return 0
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}
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// 假设约50%的端口会快速返回关闭状态(平均耗时 timeout/4)
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// 约50%的端口需要完整超时(耗时 timeout)
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// 因此平均每个任务耗时 = timeout * 0.5 * (0.25 + 1.0) = timeout * 0.625
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avgTaskTime := float64(timeout) * 0.625
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// 计算需要多少批次(向上取整)
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parallelBatches := math.Ceil(float64(totalTasks) / float64(threads))
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// 总时间 = 批次数 × 平均任务时间
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estimatedSeconds := int64(parallelBatches * avgTaskTime)
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return estimatedSeconds
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}
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// EnhancedPortScan 高性能端口扫描函数
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// 使用滑动窗口调度 + 自适应线程池 + 流式迭代器
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func EnhancedPortScan(hosts []string, ports string, timeout int64, config *common.Config, state *common.State) []string {
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// 解析端口和排除端口
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portList := parsers.ParsePort(ports)
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if len(portList) == 0 {
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common.LogError(i18n.Tr("invalid_port", ports))
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return nil
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}
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// 使用config中的排除端口配置
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excludePorts := parsers.ParsePort(config.Target.ExcludePorts)
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exclude := make(map[int]struct{}, len(excludePorts))
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for _, p := range excludePorts {
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exclude[p] = struct{}{}
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}
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// 检查代理可靠性,如果存在全回显问题则警告
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if common.IsProxyEnabled() && !common.IsProxyReliable() {
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common.LogBase("[!] 检测到代理存在全回显问题,端口扫描结果可能不准确")
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}
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// 创建流式迭代器(O(1) 内存,端口喷洒策略)
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iter := NewSocketIterator(hosts, portList, exclude)
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totalTasks := iter.Total()
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// 使用传入的配置
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threadNum := config.ThreadNum
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// 初始化端口扫描进度条
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if totalTasks > 0 && config.Output.ShowProgress {
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description := fmt.Sprintf("端口扫描中(%d线程)", threadNum)
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common.InitProgressBar(int64(totalTasks), description)
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}
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// 初始化并发控制
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to := time.Duration(timeout) * time.Second
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var count int64
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collector := newResultCollector()
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failedCollector := &failedPortCollector{}
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var wg sync.WaitGroup
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// 创建自适应线程池(支持动态调整)
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pool, err := NewAdaptivePool(threadNum, func(task interface{}) {
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taskInfo, ok := task.(portScanTask)
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if !ok {
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return
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}
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defer func() {
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<-taskInfo.semaphore // 释放窗口槽位
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wg.Done()
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}()
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addr := fmt.Sprintf("%s:%d", taskInfo.host, taskInfo.port)
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scanSinglePort(taskInfo.host, taskInfo.port, addr, to, &count, collector, failedCollector, config, state)
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common.UpdateProgressBar(1)
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}, state)
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if err != nil {
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common.LogError(i18n.Tr("thread_pool_create_failed", err))
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return nil
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}
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defer pool.Release()
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// 滑动窗口调度:维护固定数量的"飞行中"任务
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slidingWindowSchedule(iter, pool, &wg, threadNum)
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// 收集结果
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aliveAddrs := collector.GetAll()
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// 完成端口扫描进度条
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if common.IsProgressActive() {
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common.FinishProgressBar()
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}
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common.LogBase(i18n.Tr("port_scan_complete", count))
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// 检查扫描失败率,如果过高则警告用户
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resourceErrors := state.GetResourceExhaustedCount()
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failedCount := failedCollector.Count()
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if failedCount > 0 {
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failureRate := float64(failedCount) / float64(totalTasks) * 100
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if failureRate > 20 {
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// 失败率超过20%,严重警告
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common.LogError(i18n.Tr("scan_failure_rate_high", fmt.Sprintf("%.1f%%", failureRate), failedCount, totalTasks))
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common.LogError(i18n.GetText("scan_failure_reason"))
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common.LogError(i18n.Tr("scan_reduce_threads_suggestion", threadNum))
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} else if failureRate > 5 {
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// 失败率5-20%,一般警告
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common.LogInfo(i18n.Tr("scan_partial_failure", fmt.Sprintf("%.1f%%", failureRate), failedCount, totalTasks))
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common.LogInfo(i18n.Tr("scan_reduce_threads_accuracy", threadNum))
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}
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}
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if resourceErrors > 0 {
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common.LogError(i18n.Tr("resource_exhausted_warning", resourceErrors))
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}
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return aliveAddrs
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}
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// slidingWindowSchedule 滑动窗口调度器
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// 核心思想:维护固定数量的"飞行中"任务,一个完成立即补充新的
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// 优势:避免任务队列堆积,内存使用恒定
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func slidingWindowSchedule(iter *SocketIterator, pool *AdaptivePool, wg *sync.WaitGroup, windowSize int) {
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// 使用信号量控制窗口大小
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semaphore := make(chan struct{}, windowSize)
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for {
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host, port, ok := iter.Next()
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if !ok {
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break
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}
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// 获取窗口槽位(阻塞直到有空位)
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semaphore <- struct{}{}
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wg.Add(1)
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task := portScanTask{
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host: host,
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port: port,
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semaphore: semaphore,
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}
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_ = pool.Invoke(task)
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}
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// 等待所有任务完成
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wg.Wait()
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}
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// connectWithRetry 带重试的TCP连接 - 只对资源耗尽错误重试
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func connectWithRetry(addr string, timeout time.Duration, maxRetries int, state *common.State) (net.Conn, error) {
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var lastErr error
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for attempt := 0; attempt < maxRetries; attempt++ {
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conn, err := common.WrapperTcpWithTimeout("tcp", addr, timeout)
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if err == nil {
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return conn, nil
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}
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lastErr = err
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// 只对资源耗尽类错误重试,端口关闭直接返回
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if !isResourceExhaustedError(err) {
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return nil, err
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}
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// 记录资源耗尽错误
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state.IncrementResourceExhaustedCount()
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// 指数退避:第1次等50ms,第2次等150ms
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if attempt < maxRetries-1 {
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waitTime := time.Duration(50*(attempt+1)) * time.Millisecond
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time.Sleep(waitTime)
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}
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}
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return nil, lastErr
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}
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// isResourceExhaustedError 判断是否为资源耗尽类错误
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func isResourceExhaustedError(err error) bool {
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if err == nil {
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return false
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}
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errStr := err.Error()
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for _, pattern := range resourceExhaustedPatterns {
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if strings.Contains(errStr, pattern) {
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return true
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}
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}
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return false
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}
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// buildServiceLogMessage 构建服务识别的日志信息
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// 格式: addr service [Product:xxx ||Version:xxx] Banner:(xxx)
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func buildServiceLogMessage(addr string, serviceInfo *ServiceInfo, isWeb bool) string {
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var msg strings.Builder
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msg.WriteString(fmt.Sprintf("%-21s", addr))
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if serviceInfo.Name != "unknown" {
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msg.WriteString(fmt.Sprintf(" %-8s", serviceInfo.Name))
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}
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// 构建 [Product:xxx ||Version:xxx] 格式
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var info []string
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if product, ok := serviceInfo.Extras["vendor_product"]; ok && product != "" {
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info = append(info, fmt.Sprintf("Product:%s", product))
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}
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if serviceInfo.Version != "" {
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info = append(info, fmt.Sprintf("Version:%s", serviceInfo.Version))
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}
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if len(info) > 0 {
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msg.WriteString(fmt.Sprintf(" [%s]", strings.Join(info, " ||")))
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}
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// Banner 信息
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if len(serviceInfo.Banner) > 0 {
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banner := strings.TrimSpace(serviceInfo.Banner)
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if len(banner) > 80 {
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banner = banner[:80] + "..."
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}
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msg.WriteString(fmt.Sprintf(" Banner:(%s)", banner))
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}
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return msg.String()
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}
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// scanSinglePort 扫描单个端口并进行服务识别(重构后的简洁版本)
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func scanSinglePort(host string, port int, addr string, timeout time.Duration, count *int64, collector *resultCollector, failedCollector *failedPortCollector, config *common.Config, state *common.State) {
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// 步骤1:建立连接
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conn, err := connectWithRetry(addr, timeout, 3, state)
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if err != nil {
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handleConnectionFailure(err, host, port, addr, failedCollector)
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return
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}
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// 步骤1.5:代理连接深度验证(防止透明代理/全回显代理的假连接问题)
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valid, verifyMethod := verifyProxyConnectionDeep(conn, addr)
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if !valid {
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common.LogDebug(fmt.Sprintf("代理验证失败 %s: %s", addr, verifyMethod))
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_ = conn.Close()
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return
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}
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// 步骤2:记录开放端口
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atomic.AddInt64(count, 1)
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collector.Add(addr)
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saveOpenPort(host, port)
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// 步骤3:服务识别(Scanner负责关闭连接,包括探测中可能创建的新连接)
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scanner := NewSmartPortInfoScanner(host, port, conn, timeout, config)
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defer scanner.Close()
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serviceInfo, _ := scanner.SmartIdentify()
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// 步骤4:处理结果
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processServiceResult(host, port, addr, serviceInfo, config)
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}
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// handleConnectionFailure 处理连接失败
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func handleConnectionFailure(err error, host string, port int, addr string, failedCollector *failedPortCollector) {
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if isResourceExhaustedError(err) || isTimeoutError(err) {
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failedCollector.Add(host, port, addr)
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}
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}
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// isTimeoutError 判断是否为超时错误
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func isTimeoutError(err error) bool {
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return err != nil && strings.Contains(err.Error(), "i/o timeout")
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}
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// verifyProxyConnectionDeep 深度验证代理连接是否真正可用(4阶段验证)
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// 防止透明代理/全回显代理的假连接问题
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// 返回: (是否有效, 验证方式)
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func verifyProxyConnectionDeep(conn net.Conn, addr string) (bool, string) {
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// 如果没有使用代理,跳过验证
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if !common.IsProxyEnabled() {
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return true, "direct"
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}
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// 阶段1: 读取 Banner (200ms)
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// 某些服务会主动发送欢迎消息
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_ = conn.SetReadDeadline(time.Now().Add(200 * time.Millisecond))
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buf := make([]byte, 256)
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n, _ := conn.Read(buf)
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_ = conn.SetReadDeadline(time.Time{}) // 重置 deadline
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if n > 0 {
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// 收到数据,检查是否为代理错误响应
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if isProxyErrorResponse(buf[:n]) {
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common.LogDebug(fmt.Sprintf("代理返回错误响应 %s", addr))
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return false, "proxy_error"
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}
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// 收到有效 Banner,确认端口开放
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return true, "banner"
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}
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// 阶段2: 发送探测数据 (HTTP GET with Host header)
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// 使用完整的 HTTP 请求以获得服务器响应
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// 从 addr 提取主机名作为 Host 头(HTTP 服务器需要正确的 Host 才会响应)
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host := addr
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if colonIdx := strings.LastIndex(addr, ":"); colonIdx > 0 {
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host = addr[:colonIdx]
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}
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probeReq := fmt.Sprintf("GET / HTTP/1.1\r\nHost: %s\r\nConnection: close\r\n\r\n", host)
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_ = conn.SetWriteDeadline(time.Now().Add(100 * time.Millisecond))
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_, writeErr := conn.Write([]byte(probeReq))
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_ = conn.SetWriteDeadline(time.Time{}) // 重置 deadline
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if writeErr != nil && isConnectionClosed(writeErr) {
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// 写入失败(broken pipe/reset)= 连接已被拒绝
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common.LogDebug(fmt.Sprintf("探测写入失败 %s: %v", addr, writeErr))
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return false, "write_failed"
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}
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// 阶段3: 等待探测响应 (2s - 需要足够时间让 HTTP 服务器响应)
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_ = conn.SetReadDeadline(time.Now().Add(2 * time.Second))
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n, readErr := conn.Read(buf)
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_ = conn.SetReadDeadline(time.Time{})
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if n > 0 {
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// 收到响应,检查是否为代理错误
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if isProxyErrorResponse(buf[:n]) {
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common.LogDebug(fmt.Sprintf("代理探测返回错误 %s", addr))
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return false, "proxy_error"
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}
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// 收到有效响应,确认端口开放
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return true, "probe"
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}
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// 阶段4: 最终判断
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if readErr != nil {
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errLower := strings.ToLower(readErr.Error())
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for _, pattern := range proxyFailurePatterns {
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if strings.Contains(errLower, pattern) {
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common.LogDebug(fmt.Sprintf("代理连接被拒绝 %s: %v", addr, readErr))
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return false, "proxy_reject"
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}
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}
|
||
}
|
||
|
||
// 代理不可靠 + 无响应 = 假连接(全回显代理的典型行为)
|
||
if !common.IsProxyReliable() {
|
||
common.LogDebug(fmt.Sprintf("代理不可靠且无响应,判定为假连接 %s", addr))
|
||
return false, "no_response_unreliable"
|
||
}
|
||
|
||
// 代理可靠 + 无响应 = 保守确认开放(可能是静默服务)
|
||
return true, "uncertain"
|
||
}
|
||
|
||
// isProxyErrorResponse 检查是否为代理错误响应
|
||
// 支持 SOCKS5 错误码和常见代理错误模式
|
||
func isProxyErrorResponse(data []byte) bool {
|
||
if len(data) == 0 {
|
||
return false
|
||
}
|
||
|
||
// SOCKS5 错误响应检查
|
||
// SOCKS5 响应格式: [VER][REP][RSV][ATYP]...
|
||
// REP 字段: 0x00=成功, 0x01-0x08=各种失败
|
||
if len(data) >= 2 && data[0] == 0x05 {
|
||
rep := data[1]
|
||
if rep >= 0x01 && rep <= 0x08 {
|
||
return true
|
||
}
|
||
}
|
||
|
||
// 检查常见的代理错误文本
|
||
dataStr := strings.ToLower(string(data))
|
||
proxyErrorTexts := []string{
|
||
"connection refused",
|
||
"host unreachable",
|
||
"network unreachable",
|
||
"connection timed out",
|
||
"proxy error",
|
||
"gateway error",
|
||
"bad gateway",
|
||
"502",
|
||
"503",
|
||
}
|
||
|
||
for _, errText := range proxyErrorTexts {
|
||
if strings.Contains(dataStr, errText) {
|
||
return true
|
||
}
|
||
}
|
||
|
||
return false
|
||
}
|
||
|
||
// isConnectionClosed 检查错误是否表示连接已关闭
|
||
func isConnectionClosed(err error) bool {
|
||
if err == nil {
|
||
return false
|
||
}
|
||
|
||
errStr := strings.ToLower(err.Error())
|
||
closedPatterns := []string{
|
||
"broken pipe",
|
||
"connection reset",
|
||
"connection refused",
|
||
"use of closed network connection",
|
||
"connection was forcibly closed",
|
||
}
|
||
|
||
for _, pattern := range closedPatterns {
|
||
if strings.Contains(errStr, pattern) {
|
||
return true
|
||
}
|
||
}
|
||
|
||
return false
|
||
}
|
||
|
||
// saveOpenPort 保存开放端口结果
|
||
func saveOpenPort(host string, port int) {
|
||
_ = common.SaveResult(&output.ScanResult{
|
||
Time: time.Now(),
|
||
Type: output.TypePort,
|
||
Target: host,
|
||
Status: "open",
|
||
Details: map[string]interface{}{"port": port},
|
||
})
|
||
}
|
||
|
||
// processServiceResult 处理服务识别结果
|
||
func processServiceResult(host string, port int, addr string, serviceInfo *ServiceInfo, config *common.Config) {
|
||
if serviceInfo == nil {
|
||
// 服务识别失败,尝试 HTTP 回退探测
|
||
if !tryHTTPFallbackDetection(host, port, addr, config) {
|
||
common.LogInfo(i18n.Tr("port_open", addr))
|
||
}
|
||
return
|
||
}
|
||
|
||
// 保存并输出服务信息
|
||
details := buildServiceDetails(port, serviceInfo)
|
||
isWeb := IsWebServiceByFingerprint(serviceInfo)
|
||
|
||
if isWeb {
|
||
details["is_web"] = true
|
||
MarkAsWebService(host, port, serviceInfo)
|
||
}
|
||
|
||
_ = common.SaveResult(&output.ScanResult{
|
||
Time: time.Now(),
|
||
Type: output.TypeService,
|
||
Target: fmt.Sprintf("%s:%d", host, port),
|
||
Status: "identified",
|
||
Details: details,
|
||
})
|
||
|
||
common.LogInfo(buildServiceLogMessage(addr, serviceInfo, isWeb))
|
||
}
|
||
|
||
// buildServiceDetails 构建服务详情 map
|
||
func buildServiceDetails(port int, info *ServiceInfo) map[string]interface{} {
|
||
details := map[string]interface{}{
|
||
"port": port,
|
||
"service": info.Name,
|
||
}
|
||
|
||
if info.Version != "" {
|
||
details["version"] = info.Version
|
||
}
|
||
|
||
extraKeyMap := map[string]string{
|
||
"vendor_product": "product",
|
||
"os": "os",
|
||
"info": "info",
|
||
}
|
||
|
||
for k, v := range info.Extras {
|
||
if v == "" {
|
||
continue
|
||
}
|
||
if mappedKey, ok := extraKeyMap[k]; ok {
|
||
details[mappedKey] = v
|
||
}
|
||
}
|
||
|
||
if len(info.Banner) > 0 {
|
||
details["banner"] = strings.TrimSpace(info.Banner)
|
||
}
|
||
|
||
return details
|
||
}
|
||
|
||
// tryHTTPFallbackDetection 尝试HTTP回退探测,返回是否成功识别为HTTP服务
|
||
func tryHTTPFallbackDetection(host string, port int, addr string, config *common.Config) bool {
|
||
// 使用WebDetection进行HTTP协议探测
|
||
webDetector := GetWebPortDetector()
|
||
if !webDetector.DetectHTTPServiceOnly(host, port, config) {
|
||
return false
|
||
}
|
||
|
||
// HTTP探测成功,标记为Web服务
|
||
webServiceInfo := &ServiceInfo{
|
||
Name: "http",
|
||
Version: "",
|
||
Banner: "",
|
||
Extras: map[string]string{"detected_by": "http_probe"},
|
||
}
|
||
MarkAsWebService(host, port, webServiceInfo)
|
||
|
||
// 保存HTTP服务结果
|
||
details := map[string]interface{}{
|
||
"port": port,
|
||
"service": "http",
|
||
"is_web": true,
|
||
"detected_by": "http_probe",
|
||
}
|
||
_ = common.SaveResult(&output.ScanResult{
|
||
Time: time.Now(),
|
||
Type: output.TypeService,
|
||
Target: fmt.Sprintf("%s:%d", host, port),
|
||
Status: "identified",
|
||
Details: details,
|
||
})
|
||
|
||
common.LogInfo(i18n.Tr("port_open_http", addr))
|
||
return true
|
||
}
|