354 lines
11 KiB
Go
354 lines
11 KiB
Go
package service
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import (
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"context"
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"crypto/rand"
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"crypto/rsa"
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"encoding/hex"
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"fmt"
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"io"
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"net"
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"regexp"
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"strings"
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"sync"
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"time"
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"golang.org/x/crypto/ssh"
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)
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// consoleSessionTTL 是会话从创建起的最长存活时间，超时未在用即回收（含云端连接）。
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// OCI 侧另有 24 小时强制断开兜底。
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const consoleSessionTTL = 15 * time.Minute
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// 网页控制台会话类型：serial 走 PTY 交互式会话，vnc 走 5900 端口转发。
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const (
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ConsoleTypeSerial = "serial"
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ConsoleTypeVnc = "vnc"
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)
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// ConsoleSession 是一次网页控制台会话（串行 / VNC）：私钥只存内存，服务重启即失效。
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type ConsoleSession struct {
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ID string
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Type string
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cfgID uint
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instanceID string
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region string
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connectionID string // console connection OCID，同时是第一跳 SSH 的用户名
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consoleHost string // instance-console.<region>.oci.oraclecloud.com
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signer ssh.Signer
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createdAt time.Time
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mu sync.Mutex
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inUse bool
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}
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// ConsoleService 管理网页控制台会话：创建 OCI 控制台连接、建立两跳 SSH 隧道。
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type ConsoleService struct {
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configs *OciConfigService
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pollInterval time.Duration // 清理残留连接的轮询间隔，测试注入缩短
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mu sync.Mutex
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sessions map[string]*ConsoleSession
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}
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func NewConsoleService(configs *OciConfigService) *ConsoleService {
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return &ConsoleService{
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configs: configs,
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pollInterval: 2 * time.Second,
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sessions: map[string]*ConsoleSession{},
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}
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}
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// CreateSession 生成一次性 RSA 密钥对并创建实例控制台连接（等待 ACTIVE）。
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// OCI 限制每实例一个控制台连接，创建前先清理实例上的残留连接。
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func (s *ConsoleService) CreateSession(ctx context.Context, cfgID uint, instanceID, region, typ string) (*ConsoleSession, error) {
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if typ != ConsoleTypeSerial && typ != ConsoleTypeVnc {
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return nil, fmt.Errorf("unsupported console session type %q (expect serial or vnc)", typ)
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}
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key, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return nil, fmt.Errorf("generate rsa key: %w", err)
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}
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signer, err := ssh.NewSignerFromKey(key)
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if err != nil {
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return nil, fmt.Errorf("new ssh signer: %w", err)
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}
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if err := s.cleanupStaleConnections(ctx, cfgID, region, instanceID); err != nil {
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return nil, err
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}
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pubKey := strings.TrimSpace(string(ssh.MarshalAuthorizedKey(signer.PublicKey())))
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conn, err := s.configs.CreateConsoleConnection(ctx, cfgID, region, instanceID, pubKey)
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if err != nil {
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return nil, err
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}
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if conn.LifecycleState != "ACTIVE" {
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return nil, fmt.Errorf("console connection not active yet (state %s), retry later", conn.LifecycleState)
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}
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host, err := parseConsoleHost(conn.VncConnectionString)
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if err != nil {
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return nil, err
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}
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return s.storeSession(cfgID, instanceID, region, typ, conn.ID, host, signer), nil
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}
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// cleanupStaleConnections 删除实例上已有的控制台连接（每实例限一个），
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// 并等待其真正消失；DELETED 是终态记录，仅需跳过。
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func (s *ConsoleService) cleanupStaleConnections(ctx context.Context, cfgID uint, region, instanceID string) error {
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conns, err := s.configs.ConsoleConnections(ctx, cfgID, region, instanceID)
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if err != nil {
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return fmt.Errorf("list existing console connections: %w", err)
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}
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pending := false
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for _, c := range conns {
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switch c.LifecycleState {
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case "DELETED":
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continue
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case "DELETING":
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pending = true
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default:
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if err := s.configs.DeleteConsoleConnection(ctx, cfgID, region, c.ID); err != nil {
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return fmt.Errorf("delete stale console connection: %w", err)
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}
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pending = true
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}
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}
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if !pending {
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return nil
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}
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return s.waitConnectionsGone(ctx, cfgID, region, instanceID)
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}
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// waitConnectionsGone 轮询等待实例上的控制台连接全部进入 DELETED，最长约 60 秒。
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func (s *ConsoleService) waitConnectionsGone(ctx context.Context, cfgID uint, region, instanceID string) error {
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for i := 0; i < 30; i++ {
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select {
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case <-ctx.Done():
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return fmt.Errorf("wait console connection cleanup: %w", ctx.Err())
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case <-time.After(s.pollInterval):
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}
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conns, err := s.configs.ConsoleConnections(ctx, cfgID, region, instanceID)
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if err != nil {
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return fmt.Errorf("poll console connection cleanup: %w", err)
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}
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gone := true
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for _, c := range conns {
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if c.LifecycleState != "DELETED" {
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gone = false
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break
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}
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}
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if gone {
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return nil
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}
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}
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return fmt.Errorf("cleanup previous console connection timed out, retry later")
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}
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func (s *ConsoleService) storeSession(cfgID uint, instanceID, region, typ, connID, host string, signer ssh.Signer) *ConsoleSession {
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buf := make([]byte, 16)
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_, _ = rand.Read(buf)
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sess := &ConsoleSession{
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ID: hex.EncodeToString(buf),
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Type: typ,
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cfgID: cfgID,
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instanceID: instanceID,
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region: region,
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connectionID: connID,
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consoleHost: host,
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signer: signer,
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createdAt: time.Now(),
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}
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s.mu.Lock()
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s.sessions[sess.ID] = sess
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s.mu.Unlock()
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time.AfterFunc(consoleSessionTTL, func() { s.expire(sess.ID) })
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return sess
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}
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// expire TTL 到期回收：正在使用的会话跳过（连接断开后自然停止，无续期）。
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func (s *ConsoleService) expire(id string) {
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s.mu.Lock()
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sess, ok := s.sessions[id]
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if ok {
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sess.mu.Lock()
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if sess.inUse {
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ok = false
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} else {
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delete(s.sessions, id)
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}
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sess.mu.Unlock()
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}
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s.mu.Unlock()
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if ok {
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s.deleteCloudConnection(sess)
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}
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}
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// Get 返回会话；不存在或已回收返回 nil。
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func (s *ConsoleService) Get(id string) *ConsoleSession {
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s.mu.Lock()
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defer s.mu.Unlock()
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return s.sessions[id]
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}
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// CloseSession 主动结束会话并删除云端控制台连接。
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func (s *ConsoleService) CloseSession(id string) {
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s.mu.Lock()
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sess, ok := s.sessions[id]
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delete(s.sessions, id)
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s.mu.Unlock()
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if ok {
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s.deleteCloudConnection(sess)
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}
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}
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func (s *ConsoleService) deleteCloudConnection(sess *ConsoleSession) {
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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_ = s.configs.DeleteConsoleConnection(ctx, sess.cfgID, sess.region, sess.connectionID)
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}
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// MarkUse 标记会话进入 / 退出使用（使用中的会话不被 TTL 回收）。
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func (sess *ConsoleSession) MarkUse(v bool) {
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sess.mu.Lock()
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sess.inUse = v
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sess.mu.Unlock()
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}
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// consoleHostRe 从 OCI 下发的 VNC 连接串里取代理主机：
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// ssh -o ProxyCommand='ssh -W %h:%p -p 443 <conn_ocid>@<host>' ...
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var consoleHostRe = regexp.MustCompile(`-p\s+443\s+\S+@([A-Za-z0-9.-]+)`)
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func parseConsoleHost(vncConnectionString string) (string, error) {
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m := consoleHostRe.FindStringSubmatch(vncConnectionString)
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if m == nil {
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return "", fmt.Errorf("parse console host from vnc connection string failed")
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}
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return m[1], nil
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}
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// sshConfig 构造两跳共用的客户端配置；代理主机名来自 OCI API 响应，无公开指纹可校验。
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func (sess *ConsoleSession) sshConfig(user string) *ssh.ClientConfig {
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return &ssh.ClientConfig{
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User: user,
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Auth: []ssh.AuthMethod{ssh.PublicKeys(sess.signer)},
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HostKeyCallback: ssh.InsecureIgnoreHostKey(),
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Timeout: 20 * time.Second,
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}
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}
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// dialHops 建立两跳 SSH：第一跳到区域控制台代理（443，用户名为连接 OCID），
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// 在其上开通道到实例 22 端口完成第二跳握手，返回第二跳客户端。
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func (sess *ConsoleSession) dialHops() (hop1, hop2 *ssh.Client, err error) {
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hop1, err = ssh.Dial("tcp", net.JoinHostPort(sess.consoleHost, "443"), sess.sshConfig(sess.connectionID))
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if err != nil {
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return nil, nil, fmt.Errorf("dial console proxy: %w", err)
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}
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pipe, err := hop1.Dial("tcp", net.JoinHostPort(sess.instanceID, "22"))
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if err != nil {
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hop1.Close()
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return nil, nil, fmt.Errorf("open tunnel to instance console endpoint: %w", err)
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}
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conn, chans, reqs, err := ssh.NewClientConn(pipe, sess.instanceID+":22", sess.sshConfig(sess.instanceID))
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if err != nil {
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pipe.Close()
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hop1.Close()
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return nil, nil, fmt.Errorf("second hop ssh handshake: %w", err)
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}
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return hop1, ssh.NewClient(conn, chans, reqs), nil
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}
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// DialVNC 经第二跳转发到实例 5900 的 VNC 流。
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func (sess *ConsoleSession) DialVNC(ctx context.Context) (net.Conn, error) {
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hop1, hop2, err := sess.dialHops()
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if err != nil {
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return nil, err
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}
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vnc, err := hop2.Dial("tcp", net.JoinHostPort(sess.instanceID, "5900"))
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if err != nil {
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hop2.Close()
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hop1.Close()
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return nil, fmt.Errorf("open vnc channel: %w", err)
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}
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return &chainedConn{Conn: vnc, closers: []func() error{hop2.Close, hop1.Close}}, nil
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}
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// SerialTerminal 是一路串行控制台终端：读端为串口输出，写端为键入；
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// Resize 调整代理侧 PTY 尺寸（guest 内 tty 需另行 stty 同步）。
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type SerialTerminal struct {
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io.Reader
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io.Writer
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session *ssh.Session
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closers []func() error
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}
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func (t *SerialTerminal) Resize(rows, cols int) error {
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return t.session.WindowChange(rows, cols)
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}
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func (t *SerialTerminal) Close() error {
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err := t.session.Close()
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for _, fn := range t.closers {
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_ = fn()
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}
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return err
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}
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// OpenSerial 经第二跳打开交互式 PTY 会话，会话的输入输出即串口字节流。
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func (sess *ConsoleSession) OpenSerial(ctx context.Context, rows, cols int) (*SerialTerminal, error) {
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hop1, hop2, err := sess.dialHops()
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if err != nil {
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return nil, err
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}
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term, err := openSerialSession(hop2, rows, cols)
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if err != nil {
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hop2.Close()
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hop1.Close()
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return nil, err
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}
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term.closers = []func() error{hop2.Close, hop1.Close}
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return term, nil
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}
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// openSerialSession 在第二跳上申请 PTY 并启动 shell（即串口流）。
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func openSerialSession(hop2 *ssh.Client, rows, cols int) (*SerialTerminal, error) {
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session, err := hop2.NewSession()
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if err != nil {
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return nil, fmt.Errorf("open serial session: %w", err)
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}
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modes := ssh.TerminalModes{ssh.ECHO: 1, ssh.TTY_OP_ISPEED: 115200, ssh.TTY_OP_OSPEED: 115200}
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if err := session.RequestPty("xterm-256color", rows, cols, modes); err != nil {
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session.Close()
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return nil, fmt.Errorf("request pty: %w", err)
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}
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stdin, err := session.StdinPipe()
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if err != nil {
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session.Close()
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return nil, fmt.Errorf("serial stdin pipe: %w", err)
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}
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stdout, err := session.StdoutPipe()
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if err != nil {
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session.Close()
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return nil, fmt.Errorf("serial stdout pipe: %w", err)
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}
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if err := session.Shell(); err != nil {
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session.Close()
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return nil, fmt.Errorf("start serial shell: %w", err)
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}
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return &SerialTerminal{Reader: stdout, Writer: stdin, session: session}, nil
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}
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// chainedConn 关闭数据流时连带关闭底层 SSH 连接，避免隧道泄漏。
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type chainedConn struct {
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net.Conn
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closers []func() error
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}
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func (c *chainedConn) Close() error {
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err := c.Conn.Close()
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for _, fn := range c.closers {
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_ = fn()
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}
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return err
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}
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