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engine.go 35 KB

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  1. package mitm
  2. import (
  3. "bufio"
  4. "bytes"
  5. "context"
  6. "crypto/tls"
  7. "crypto/x509"
  8. "encoding/base64"
  9. "io"
  10. "math"
  11. "mime"
  12. "net"
  13. "net/http"
  14. "net/url"
  15. "os"
  16. "path/filepath"
  17. "strings"
  18. "time"
  19. "unicode"
  20. "github.com/sagernet/sing-box/adapter"
  21. "github.com/sagernet/sing-box/common/dialer"
  22. sTLS "github.com/sagernet/sing-box/common/tls"
  23. "github.com/sagernet/sing-box/option"
  24. "github.com/sagernet/sing/common"
  25. "github.com/sagernet/sing/common/atomic"
  26. E "github.com/sagernet/sing/common/exceptions"
  27. F "github.com/sagernet/sing/common/format"
  28. "github.com/sagernet/sing/common/logger"
  29. M "github.com/sagernet/sing/common/metadata"
  30. N "github.com/sagernet/sing/common/network"
  31. "github.com/sagernet/sing/common/ntp"
  32. sHTTP "github.com/sagernet/sing/protocol/http"
  33. "github.com/sagernet/sing/service"
  34. "golang.org/x/crypto/pkcs12"
  35. "golang.org/x/net/http2"
  36. )
  37. var _ adapter.MITMEngine = (*Engine)(nil)
  38. type Engine struct {
  39. ctx context.Context
  40. logger logger.ContextLogger
  41. connection adapter.ConnectionManager
  42. script adapter.ScriptManager
  43. timeFunc func() time.Time
  44. http2Enabled bool
  45. tlsDecryptionEnabled bool
  46. tlsPrivateKey any
  47. tlsCertificate *x509.Certificate
  48. }
  49. func NewEngine(ctx context.Context, logger logger.ContextLogger, options option.MITMOptions) (*Engine, error) {
  50. engine := &Engine{
  51. ctx: ctx,
  52. logger: logger,
  53. http2Enabled: options.HTTP2Enabled,
  54. }
  55. if options.TLSDecryptionOptions != nil && options.TLSDecryptionOptions.Enabled {
  56. pfxBytes, err := base64.StdEncoding.DecodeString(options.TLSDecryptionOptions.KeyPair)
  57. if err != nil {
  58. return nil, E.Cause(err, "decode key pair base64 bytes")
  59. }
  60. privateKey, certificate, err := pkcs12.Decode(pfxBytes, options.TLSDecryptionOptions.KeyPassword)
  61. if err != nil {
  62. return nil, E.Cause(err, "decode key pair")
  63. }
  64. engine.tlsDecryptionEnabled = true
  65. engine.tlsPrivateKey = privateKey
  66. engine.tlsCertificate = certificate
  67. }
  68. return engine, nil
  69. }
  70. func (e *Engine) Start(stage adapter.StartStage) error {
  71. switch stage {
  72. case adapter.StartStateInitialize:
  73. e.connection = service.FromContext[adapter.ConnectionManager](e.ctx)
  74. e.script = service.FromContext[adapter.ScriptManager](e.ctx)
  75. e.timeFunc = ntp.TimeFuncFromContext(e.ctx)
  76. if e.timeFunc == nil {
  77. e.timeFunc = time.Now
  78. }
  79. }
  80. return nil
  81. }
  82. func (e *Engine) Close() error {
  83. return nil
  84. }
  85. func (e *Engine) ExportCertificate() *x509.Certificate {
  86. return e.tlsCertificate
  87. }
  88. func (e *Engine) NewConnection(ctx context.Context, this N.Dialer, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
  89. if e.tlsDecryptionEnabled && metadata.ClientHello != nil {
  90. err := e.newTLS(ctx, this, conn, metadata, onClose)
  91. if err != nil {
  92. e.logger.ErrorContext(ctx, err)
  93. } else {
  94. e.logger.DebugContext(ctx, "connection closed")
  95. }
  96. if onClose != nil {
  97. onClose(err)
  98. }
  99. return
  100. } else if metadata.HTTPRequest != nil {
  101. err := e.newHTTP1(ctx, this, conn, nil, metadata)
  102. if err != nil {
  103. e.logger.ErrorContext(ctx, err)
  104. } else {
  105. e.logger.DebugContext(ctx, "connection closed")
  106. }
  107. if onClose != nil {
  108. onClose(err)
  109. }
  110. return
  111. } else {
  112. e.logger.DebugContext(ctx, "HTTP and TLS not detected, skipped")
  113. }
  114. metadata.MITM = nil
  115. e.connection.NewConnection(ctx, this, conn, metadata, onClose)
  116. }
  117. func (e *Engine) newTLS(ctx context.Context, this N.Dialer, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) error {
  118. acceptHTTP := len(metadata.ClientHello.SupportedProtos) == 0 || common.Contains(metadata.ClientHello.SupportedProtos, "http/1.1")
  119. acceptH2 := e.http2Enabled && common.Contains(metadata.ClientHello.SupportedProtos, "h2")
  120. if !acceptHTTP && !acceptH2 {
  121. metadata.MITM = nil
  122. e.logger.DebugContext(ctx, "unsupported application protocol: ", strings.Join(metadata.ClientHello.SupportedProtos, ","))
  123. e.connection.NewConnection(ctx, this, conn, metadata, onClose)
  124. return nil
  125. }
  126. var nextProtos []string
  127. if acceptH2 {
  128. nextProtos = append(nextProtos, "h2")
  129. } else if acceptHTTP {
  130. nextProtos = append(nextProtos, "http/1.1")
  131. }
  132. var (
  133. maxVersion uint16
  134. minVersion uint16
  135. )
  136. for _, version := range metadata.ClientHello.SupportedVersions {
  137. maxVersion = common.Max(maxVersion, version)
  138. minVersion = common.Min(minVersion, version)
  139. }
  140. serverName := metadata.ClientHello.ServerName
  141. if serverName == "" && metadata.Destination.IsIP() {
  142. serverName = metadata.Destination.Addr.String()
  143. }
  144. tlsConfig := &tls.Config{
  145. Time: e.timeFunc,
  146. ServerName: serverName,
  147. NextProtos: nextProtos,
  148. MinVersion: minVersion,
  149. MaxVersion: maxVersion,
  150. GetCertificate: func(info *tls.ClientHelloInfo) (*tls.Certificate, error) {
  151. return sTLS.GenerateKeyPair(e.tlsCertificate, e.tlsPrivateKey, e.timeFunc, serverName)
  152. },
  153. }
  154. tlsConn := tls.Server(conn, tlsConfig)
  155. err := tlsConn.HandshakeContext(ctx)
  156. if err != nil {
  157. return E.Cause(err, "TLS handshake failed for ", metadata.ClientHello.ServerName, ", ", strings.Join(metadata.ClientHello.SupportedProtos, ", "))
  158. }
  159. if tlsConn.ConnectionState().NegotiatedProtocol == "h2" {
  160. return e.newHTTP2(ctx, this, tlsConn, tlsConfig, metadata, onClose)
  161. } else {
  162. return e.newHTTP1(ctx, this, tlsConn, tlsConfig, metadata)
  163. }
  164. }
  165. func (e *Engine) newHTTP1(ctx context.Context, this N.Dialer, conn net.Conn, tlsConfig *tls.Config, metadata adapter.InboundContext) error {
  166. options := metadata.MITM
  167. defer conn.Close()
  168. reader := bufio.NewReader(conn)
  169. request, err := sHTTP.ReadRequest(reader)
  170. if err != nil {
  171. return E.Cause(err, "read HTTP request")
  172. }
  173. rawRequestURL := request.URL
  174. if tlsConfig != nil {
  175. rawRequestURL.Scheme = "https"
  176. } else {
  177. rawRequestURL.Scheme = "http"
  178. }
  179. if rawRequestURL.Host == "" {
  180. rawRequestURL.Host = request.Host
  181. }
  182. requestURL := rawRequestURL.String()
  183. request.RequestURI = ""
  184. var (
  185. requestMatch bool
  186. requestScript adapter.SurgeScript
  187. requestScriptOptions option.MITMRouteSurgeScriptOptions
  188. )
  189. match:
  190. for _, scriptOptions := range options.Script {
  191. script, loaded := e.script.Script(scriptOptions.Tag)
  192. if !loaded {
  193. e.logger.WarnContext(ctx, "script not found: ", scriptOptions.Tag)
  194. continue
  195. }
  196. surgeScript, isSurge := script.(adapter.SurgeScript)
  197. if !isSurge {
  198. e.logger.WarnContext(ctx, "specified script/", script.Type(), "[", script.Tag(), "] is not a Surge script")
  199. continue
  200. }
  201. for _, pattern := range scriptOptions.Pattern {
  202. if pattern.Build().MatchString(requestURL) {
  203. e.logger.DebugContext(ctx, "match script/", surgeScript.Type(), "[", surgeScript.Tag(), "]")
  204. requestScript = surgeScript
  205. requestScriptOptions = scriptOptions
  206. requestMatch = true
  207. break match
  208. }
  209. }
  210. }
  211. var body []byte
  212. if options.Print && request.ContentLength > 0 && request.ContentLength <= 131072 {
  213. body, err = io.ReadAll(request.Body)
  214. if err != nil {
  215. return E.Cause(err, "read HTTP request body")
  216. }
  217. request.Body = io.NopCloser(bytes.NewReader(body))
  218. }
  219. if options.Print {
  220. e.printRequest(ctx, request, body)
  221. }
  222. if requestScript != nil {
  223. if body == nil && requestScriptOptions.RequiresBody && request.ContentLength > 0 && (requestScriptOptions.MaxSize == 0 && request.ContentLength <= 131072 || request.ContentLength <= requestScriptOptions.MaxSize) {
  224. body, err = io.ReadAll(request.Body)
  225. if err != nil {
  226. return E.Cause(err, "read HTTP request body")
  227. }
  228. request.Body = io.NopCloser(bytes.NewReader(body))
  229. }
  230. var result *adapter.HTTPRequestScriptResult
  231. result, err = requestScript.ExecuteHTTPRequest(ctx, time.Duration(requestScriptOptions.Timeout), request, body, requestScriptOptions.BinaryBodyMode, requestScriptOptions.Arguments)
  232. if err != nil {
  233. return E.Cause(err, "execute script/", requestScript.Type(), "[", requestScript.Tag(), "]")
  234. }
  235. if result.Response != nil {
  236. if result.Response.Status == 0 {
  237. result.Response.Status = http.StatusOK
  238. }
  239. response := &http.Response{
  240. StatusCode: result.Response.Status,
  241. Status: http.StatusText(result.Response.Status),
  242. Proto: request.Proto,
  243. ProtoMajor: request.ProtoMajor,
  244. ProtoMinor: request.ProtoMinor,
  245. Header: result.Response.Headers,
  246. Body: io.NopCloser(bytes.NewReader(result.Response.Body)),
  247. }
  248. err = response.Write(conn)
  249. if err != nil {
  250. return E.Cause(err, "write fake response body")
  251. }
  252. return nil
  253. } else {
  254. if result.URL != "" {
  255. var newURL *url.URL
  256. newURL, err = url.Parse(result.URL)
  257. if err != nil {
  258. return E.Cause(err, "parse updated request URL")
  259. }
  260. request.URL = newURL
  261. newDestination := M.ParseSocksaddrHostPortStr(newURL.Hostname(), newURL.Port())
  262. if newDestination.Port == 0 {
  263. newDestination.Port = metadata.Destination.Port
  264. }
  265. metadata.Destination = newDestination
  266. if tlsConfig != nil {
  267. tlsConfig.ServerName = newURL.Hostname()
  268. }
  269. }
  270. for key, values := range result.Headers {
  271. request.Header[key] = values
  272. }
  273. if newHost := result.Headers.Get("Host"); newHost != "" {
  274. request.Host = newHost
  275. request.Header.Del("Host")
  276. }
  277. if result.Body != nil {
  278. body = result.Body
  279. request.Body = io.NopCloser(bytes.NewReader(body))
  280. request.ContentLength = int64(len(body))
  281. }
  282. }
  283. }
  284. if !requestMatch {
  285. for i, rule := range options.SurgeURLRewrite {
  286. if !rule.Pattern.MatchString(requestURL) {
  287. continue
  288. }
  289. e.logger.DebugContext(ctx, "match url_rewrite[", i, "] => ", rule.String())
  290. if rule.Reject {
  291. return E.New("request rejected by url_rewrite")
  292. } else if rule.Redirect {
  293. w := new(simpleResponseWriter)
  294. http.Redirect(w, request, rule.Destination.String(), http.StatusFound)
  295. err = w.Build(request).Write(conn)
  296. if err != nil {
  297. return E.Cause(err, "write url_rewrite 302 response")
  298. }
  299. return nil
  300. }
  301. requestMatch = true
  302. request.URL = rule.Destination
  303. newDestination := M.ParseSocksaddrHostPortStr(rule.Destination.Hostname(), rule.Destination.Port())
  304. if newDestination.Port == 0 {
  305. newDestination.Port = metadata.Destination.Port
  306. }
  307. metadata.Destination = newDestination
  308. if tlsConfig != nil {
  309. tlsConfig.ServerName = rule.Destination.Hostname()
  310. }
  311. break
  312. }
  313. for i, rule := range options.SurgeHeaderRewrite {
  314. if rule.Response {
  315. continue
  316. }
  317. if !rule.Pattern.MatchString(requestURL) {
  318. continue
  319. }
  320. requestMatch = true
  321. e.logger.DebugContext(ctx, "match header_rewrite[", i, "] => ", rule.String())
  322. switch {
  323. case rule.Add:
  324. if strings.ToLower(rule.Key) == "host" {
  325. request.Host = rule.Value
  326. continue
  327. }
  328. request.Header.Add(rule.Key, rule.Value)
  329. case rule.Delete:
  330. request.Header.Del(rule.Key)
  331. case rule.Replace:
  332. if request.Header.Get(rule.Key) != "" {
  333. request.Header.Set(rule.Key, rule.Value)
  334. }
  335. case rule.ReplaceRegex:
  336. if value := request.Header.Get(rule.Key); value != "" {
  337. request.Header.Set(rule.Key, rule.Match.ReplaceAllString(value, rule.Value))
  338. }
  339. }
  340. }
  341. for i, rule := range options.SurgeBodyRewrite {
  342. if rule.Response {
  343. continue
  344. }
  345. if !rule.Pattern.MatchString(requestURL) {
  346. continue
  347. }
  348. requestMatch = true
  349. e.logger.DebugContext(ctx, "match body_rewrite[", i, "] => ", rule.String())
  350. if body == nil {
  351. if request.ContentLength <= 0 {
  352. e.logger.WarnContext(ctx, "body replace skipped due to non-fixed content length")
  353. break
  354. } else if request.ContentLength > 131072 {
  355. e.logger.WarnContext(ctx, "body replace skipped due to large content length: ", request.ContentLength)
  356. break
  357. }
  358. body, err = io.ReadAll(request.Body)
  359. if err != nil {
  360. return E.Cause(err, "read HTTP request body")
  361. }
  362. }
  363. for mi := 0; i < len(rule.Match); i++ {
  364. body = rule.Match[mi].ReplaceAll(body, []byte(rule.Replace[i]))
  365. }
  366. request.Body = io.NopCloser(bytes.NewReader(body))
  367. request.ContentLength = int64(len(body))
  368. }
  369. }
  370. if !requestMatch {
  371. for i, rule := range options.SurgeMapLocal {
  372. if !rule.Pattern.MatchString(requestURL) {
  373. continue
  374. }
  375. requestMatch = true
  376. e.logger.DebugContext(ctx, "match map_local[", i, "] => ", rule.String())
  377. var (
  378. statusCode = http.StatusOK
  379. headers = make(http.Header)
  380. )
  381. if rule.StatusCode > 0 {
  382. statusCode = rule.StatusCode
  383. }
  384. switch {
  385. case rule.File:
  386. resource, err := os.ReadFile(rule.Data)
  387. if err != nil {
  388. return E.Cause(err, "open map local source")
  389. }
  390. mimeType := mime.TypeByExtension(filepath.Ext(rule.Data))
  391. if mimeType == "" {
  392. mimeType = "application/octet-stream"
  393. }
  394. headers.Set("Content-Type", mimeType)
  395. body = resource
  396. case rule.Text:
  397. headers.Set("Content-Type", "text/plain")
  398. body = []byte(rule.Data)
  399. case rule.TinyGif:
  400. headers.Set("Content-Type", "image/gif")
  401. body = surgeTinyGif()
  402. case rule.Base64:
  403. headers.Set("Content-Type", "application/octet-stream")
  404. body = rule.Base64Data
  405. }
  406. response := &http.Response{
  407. StatusCode: statusCode,
  408. Status: http.StatusText(statusCode),
  409. Proto: request.Proto,
  410. ProtoMajor: request.ProtoMajor,
  411. ProtoMinor: request.ProtoMinor,
  412. Header: headers,
  413. Body: io.NopCloser(bytes.NewReader(body)),
  414. }
  415. err = response.Write(conn)
  416. if err != nil {
  417. return E.Cause(err, "write map local response")
  418. }
  419. return nil
  420. }
  421. }
  422. ctx = adapter.WithContext(ctx, &metadata)
  423. var innerErr atomic.TypedValue[error]
  424. httpClient := &http.Client{
  425. Transport: &http.Transport{
  426. DialContext: func(ctx context.Context, network, address string) (net.Conn, error) {
  427. if len(metadata.DestinationAddresses) > 0 || metadata.Destination.IsIP() {
  428. return dialer.DialSerialNetwork(ctx, this, N.NetworkTCP, metadata.Destination, metadata.DestinationAddresses, metadata.NetworkStrategy, metadata.NetworkType, metadata.FallbackNetworkType, metadata.FallbackDelay)
  429. } else {
  430. return this.DialContext(ctx, N.NetworkTCP, metadata.Destination)
  431. }
  432. },
  433. TLSClientConfig: tlsConfig,
  434. },
  435. CheckRedirect: func(req *http.Request, via []*http.Request) error {
  436. return http.ErrUseLastResponse
  437. },
  438. }
  439. defer httpClient.CloseIdleConnections()
  440. requestCtx, cancel := context.WithCancel(ctx)
  441. defer cancel()
  442. response, err := httpClient.Do(request.WithContext(requestCtx))
  443. if err != nil {
  444. cancel()
  445. return E.Errors(innerErr.Load(), err)
  446. }
  447. var (
  448. responseScript adapter.SurgeScript
  449. responseMatch bool
  450. responseScriptOptions option.MITMRouteSurgeScriptOptions
  451. )
  452. matchResponse:
  453. for _, scriptOptions := range options.Script {
  454. script, loaded := e.script.Script(scriptOptions.Tag)
  455. if !loaded {
  456. e.logger.WarnContext(ctx, "script not found: ", scriptOptions.Tag)
  457. continue
  458. }
  459. surgeScript, isSurge := script.(adapter.SurgeScript)
  460. if !isSurge {
  461. e.logger.WarnContext(ctx, "specified script/", script.Type(), "[", script.Tag(), "] is not a Surge script")
  462. continue
  463. }
  464. for _, pattern := range scriptOptions.Pattern {
  465. if pattern.Build().MatchString(requestURL) {
  466. e.logger.DebugContext(ctx, "match script/", surgeScript.Type(), "[", surgeScript.Tag(), "]")
  467. responseScript = surgeScript
  468. responseScriptOptions = scriptOptions
  469. responseMatch = true
  470. break matchResponse
  471. }
  472. }
  473. }
  474. var responseBody []byte
  475. if options.Print && response.ContentLength > 0 && response.ContentLength <= 131072 {
  476. responseBody, err = io.ReadAll(response.Body)
  477. if err != nil {
  478. return E.Cause(err, "read HTTP response body")
  479. }
  480. response.Body = io.NopCloser(bytes.NewReader(responseBody))
  481. }
  482. if options.Print {
  483. e.printResponse(ctx, request, response, responseBody)
  484. }
  485. if responseScript != nil {
  486. if responseBody == nil && responseScriptOptions.RequiresBody && response.ContentLength > 0 && (responseScriptOptions.MaxSize == 0 && response.ContentLength <= 131072 || response.ContentLength <= responseScriptOptions.MaxSize) {
  487. responseBody, err = io.ReadAll(response.Body)
  488. if err != nil {
  489. return E.Cause(err, "read HTTP response body")
  490. }
  491. response.Body = io.NopCloser(bytes.NewReader(responseBody))
  492. }
  493. var result *adapter.HTTPResponseScriptResult
  494. result, err = responseScript.ExecuteHTTPResponse(ctx, time.Duration(responseScriptOptions.Timeout), request, response, responseBody, responseScriptOptions.BinaryBodyMode, responseScriptOptions.Arguments)
  495. if err != nil {
  496. return E.Cause(err, "execute script/", responseScript.Type(), "[", responseScript.Tag(), "]")
  497. }
  498. if result.Status > 0 {
  499. response.Status = http.StatusText(result.Status)
  500. response.StatusCode = result.Status
  501. }
  502. for key, values := range result.Headers {
  503. response.Header[key] = values
  504. }
  505. if result.Body != nil {
  506. response.Body.Close()
  507. responseBody = result.Body
  508. response.Body = io.NopCloser(bytes.NewReader(responseBody))
  509. response.ContentLength = int64(len(responseBody))
  510. }
  511. }
  512. if !responseMatch {
  513. for i, rule := range options.SurgeHeaderRewrite {
  514. if !rule.Response {
  515. continue
  516. }
  517. if !rule.Pattern.MatchString(requestURL) {
  518. continue
  519. }
  520. responseMatch = true
  521. e.logger.DebugContext(ctx, "match header_rewrite[", i, "] => ", rule.String())
  522. switch {
  523. case rule.Add:
  524. response.Header.Add(rule.Key, rule.Value)
  525. case rule.Delete:
  526. response.Header.Del(rule.Key)
  527. case rule.Replace:
  528. if response.Header.Get(rule.Key) != "" {
  529. response.Header.Set(rule.Key, rule.Value)
  530. }
  531. case rule.ReplaceRegex:
  532. if value := response.Header.Get(rule.Key); value != "" {
  533. response.Header.Set(rule.Key, rule.Match.ReplaceAllString(value, rule.Value))
  534. }
  535. }
  536. }
  537. for i, rule := range options.SurgeBodyRewrite {
  538. if !rule.Response {
  539. continue
  540. }
  541. if !rule.Pattern.MatchString(requestURL) {
  542. continue
  543. }
  544. responseMatch = true
  545. e.logger.DebugContext(ctx, "match body_rewrite[", i, "] => ", rule.String())
  546. if responseBody == nil {
  547. if response.ContentLength <= 0 {
  548. e.logger.WarnContext(ctx, "body replace skipped due to non-fixed content length")
  549. break
  550. } else if response.ContentLength > 131072 {
  551. e.logger.WarnContext(ctx, "body replace skipped due to large content length: ", request.ContentLength)
  552. break
  553. }
  554. responseBody, err = io.ReadAll(response.Body)
  555. if err != nil {
  556. return E.Cause(err, "read HTTP request body")
  557. }
  558. }
  559. for mi := 0; i < len(rule.Match); i++ {
  560. responseBody = rule.Match[mi].ReplaceAll(responseBody, []byte(rule.Replace[i]))
  561. }
  562. response.Body = io.NopCloser(bytes.NewReader(responseBody))
  563. response.ContentLength = int64(len(responseBody))
  564. }
  565. }
  566. if !options.Print && !requestMatch && !responseMatch {
  567. e.logger.WarnContext(ctx, "request not modified")
  568. }
  569. err = response.Write(conn)
  570. if err != nil {
  571. return E.Errors(E.Cause(err, "write HTTP response"), innerErr.Load())
  572. } else if innerErr.Load() != nil {
  573. return E.Cause(innerErr.Load(), "write HTTP response")
  574. }
  575. return nil
  576. }
  577. func (e *Engine) newHTTP2(ctx context.Context, this N.Dialer, conn net.Conn, tlsConfig *tls.Config, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) error {
  578. httpTransport := &http.Transport{
  579. ForceAttemptHTTP2: true,
  580. DialContext: func(ctx context.Context, network, address string) (net.Conn, error) {
  581. ctx = adapter.WithContext(ctx, &metadata)
  582. if len(metadata.DestinationAddresses) > 0 || metadata.Destination.IsIP() {
  583. return dialer.DialSerialNetwork(ctx, this, N.NetworkTCP, metadata.Destination, metadata.DestinationAddresses, metadata.NetworkStrategy, metadata.NetworkType, metadata.FallbackNetworkType, metadata.FallbackDelay)
  584. } else {
  585. return this.DialContext(ctx, N.NetworkTCP, metadata.Destination)
  586. }
  587. },
  588. TLSClientConfig: tlsConfig,
  589. }
  590. err := http2.ConfigureTransport(httpTransport)
  591. if err != nil {
  592. return E.Cause(err, "configure HTTP/2 transport")
  593. }
  594. handler := &engineHandler{
  595. Engine: e,
  596. conn: conn,
  597. tlsConfig: tlsConfig,
  598. dialer: this,
  599. metadata: metadata,
  600. httpClient: &http.Client{
  601. Transport: httpTransport,
  602. CheckRedirect: func(req *http.Request, via []*http.Request) error {
  603. return http.ErrUseLastResponse
  604. },
  605. },
  606. onClose: onClose,
  607. }
  608. http2Server := &http2.Server{
  609. MaxReadFrameSize: math.MaxUint32,
  610. }
  611. http2Server.ServeConn(conn, &http2.ServeConnOpts{
  612. Context: ctx,
  613. Handler: handler,
  614. })
  615. return nil
  616. }
  617. type engineHandler struct {
  618. *Engine
  619. conn net.Conn
  620. tlsConfig *tls.Config
  621. dialer N.Dialer
  622. metadata adapter.InboundContext
  623. onClose N.CloseHandlerFunc
  624. httpClient *http.Client
  625. }
  626. func (e *engineHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
  627. err := e.serveHTTP(request.Context(), writer, request)
  628. if err != nil {
  629. if E.IsClosedOrCanceled(err) {
  630. e.logger.DebugContext(request.Context(), E.Cause(err, "connection closed"))
  631. } else {
  632. e.logger.ErrorContext(request.Context(), err)
  633. }
  634. }
  635. }
  636. func (e *engineHandler) serveHTTP(ctx context.Context, writer http.ResponseWriter, request *http.Request) error {
  637. options := e.metadata.MITM
  638. rawRequestURL := request.URL
  639. rawRequestURL.Scheme = "https"
  640. if rawRequestURL.Host == "" {
  641. rawRequestURL.Host = request.Host
  642. }
  643. requestURL := rawRequestURL.String()
  644. request.RequestURI = ""
  645. var (
  646. requestMatch bool
  647. requestScript adapter.SurgeScript
  648. requestScriptOptions option.MITMRouteSurgeScriptOptions
  649. )
  650. match:
  651. for _, scriptOptions := range options.Script {
  652. script, loaded := e.script.Script(scriptOptions.Tag)
  653. if !loaded {
  654. e.logger.WarnContext(ctx, "script not found: ", scriptOptions.Tag)
  655. continue
  656. }
  657. surgeScript, isSurge := script.(adapter.SurgeScript)
  658. if !isSurge {
  659. e.logger.WarnContext(ctx, "specified script/", script.Type(), "[", script.Tag(), "] is not a Surge script")
  660. continue
  661. }
  662. for _, pattern := range scriptOptions.Pattern {
  663. if pattern.Build().MatchString(requestURL) {
  664. e.logger.DebugContext(ctx, "match script/", surgeScript.Type(), "[", surgeScript.Tag(), "]")
  665. requestScript = surgeScript
  666. requestScriptOptions = scriptOptions
  667. requestMatch = true
  668. break match
  669. }
  670. }
  671. }
  672. var (
  673. body []byte
  674. err error
  675. )
  676. if options.Print && request.ContentLength > 0 && request.ContentLength <= 131072 {
  677. body, err = io.ReadAll(request.Body)
  678. if err != nil {
  679. return E.Cause(err, "read HTTP request body")
  680. }
  681. request.Body.Close()
  682. request.Body = io.NopCloser(bytes.NewReader(body))
  683. }
  684. if options.Print {
  685. e.printRequest(ctx, request, body)
  686. }
  687. if requestScript != nil {
  688. if body == nil && requestScriptOptions.RequiresBody && request.ContentLength > 0 && (requestScriptOptions.MaxSize == 0 && request.ContentLength <= 131072 || request.ContentLength <= requestScriptOptions.MaxSize) {
  689. body, err = io.ReadAll(request.Body)
  690. if err != nil {
  691. return E.Cause(err, "read HTTP request body")
  692. }
  693. request.Body.Close()
  694. request.Body = io.NopCloser(bytes.NewReader(body))
  695. }
  696. result, err := requestScript.ExecuteHTTPRequest(ctx, time.Duration(requestScriptOptions.Timeout), request, body, requestScriptOptions.BinaryBodyMode, requestScriptOptions.Arguments)
  697. if err != nil {
  698. return E.Cause(err, "execute script/", requestScript.Type(), "[", requestScript.Tag(), "]")
  699. }
  700. if result.Response != nil {
  701. if result.Response.Status == 0 {
  702. result.Response.Status = http.StatusOK
  703. }
  704. for key, values := range result.Response.Headers {
  705. writer.Header()[key] = values
  706. }
  707. writer.WriteHeader(result.Response.Status)
  708. if result.Response.Body != nil {
  709. _, err = writer.Write(result.Response.Body)
  710. if err != nil {
  711. return E.Cause(err, "write fake response body")
  712. }
  713. }
  714. return nil
  715. } else {
  716. if result.URL != "" {
  717. var newURL *url.URL
  718. newURL, err = url.Parse(result.URL)
  719. if err != nil {
  720. return E.Cause(err, "parse updated request URL")
  721. }
  722. request.URL = newURL
  723. newDestination := M.ParseSocksaddrHostPortStr(newURL.Hostname(), newURL.Port())
  724. if newDestination.Port == 0 {
  725. newDestination.Port = e.metadata.Destination.Port
  726. }
  727. e.metadata.Destination = newDestination
  728. e.tlsConfig.ServerName = newURL.Hostname()
  729. }
  730. for key, values := range result.Headers {
  731. request.Header[key] = values
  732. }
  733. if newHost := result.Headers.Get("Host"); newHost != "" {
  734. request.Host = newHost
  735. request.Header.Del("Host")
  736. }
  737. if result.Body != nil {
  738. io.Copy(io.Discard, request.Body)
  739. request.Body = io.NopCloser(bytes.NewReader(result.Body))
  740. request.ContentLength = int64(len(result.Body))
  741. }
  742. }
  743. }
  744. if !requestMatch {
  745. for i, rule := range options.SurgeURLRewrite {
  746. if !rule.Pattern.MatchString(requestURL) {
  747. continue
  748. }
  749. e.logger.DebugContext(ctx, "match url_rewrite[", i, "] => ", rule.String())
  750. if rule.Reject {
  751. return E.New("request rejected by url_rewrite")
  752. } else if rule.Redirect {
  753. http.Redirect(writer, request, rule.Destination.String(), http.StatusFound)
  754. return nil
  755. }
  756. requestMatch = true
  757. request.URL = rule.Destination
  758. newDestination := M.ParseSocksaddrHostPortStr(rule.Destination.Hostname(), rule.Destination.Port())
  759. if newDestination.Port == 0 {
  760. newDestination.Port = e.metadata.Destination.Port
  761. }
  762. e.metadata.Destination = newDestination
  763. e.tlsConfig.ServerName = rule.Destination.Hostname()
  764. break
  765. }
  766. for i, rule := range options.SurgeHeaderRewrite {
  767. if rule.Response {
  768. continue
  769. }
  770. if !rule.Pattern.MatchString(requestURL) {
  771. continue
  772. }
  773. requestMatch = true
  774. e.logger.DebugContext(ctx, "match header_rewrite[", i, "] => ", rule.String())
  775. switch {
  776. case rule.Add:
  777. if strings.ToLower(rule.Key) == "host" {
  778. request.Host = rule.Value
  779. continue
  780. }
  781. request.Header.Add(rule.Key, rule.Value)
  782. case rule.Delete:
  783. request.Header.Del(rule.Key)
  784. case rule.Replace:
  785. if request.Header.Get(rule.Key) != "" {
  786. request.Header.Set(rule.Key, rule.Value)
  787. }
  788. case rule.ReplaceRegex:
  789. if value := request.Header.Get(rule.Key); value != "" {
  790. request.Header.Set(rule.Key, rule.Match.ReplaceAllString(value, rule.Value))
  791. }
  792. }
  793. }
  794. for i, rule := range options.SurgeBodyRewrite {
  795. if rule.Response {
  796. continue
  797. }
  798. if !rule.Pattern.MatchString(requestURL) {
  799. continue
  800. }
  801. requestMatch = true
  802. e.logger.DebugContext(ctx, "match body_rewrite[", i, "] => ", rule.String())
  803. var body []byte
  804. if request.ContentLength <= 0 {
  805. e.logger.WarnContext(ctx, "body replace skipped due to non-fixed content length")
  806. break
  807. } else if request.ContentLength > 131072 {
  808. e.logger.WarnContext(ctx, "body replace skipped due to large content length: ", request.ContentLength)
  809. break
  810. }
  811. body, err := io.ReadAll(request.Body)
  812. if err != nil {
  813. return E.Cause(err, "read HTTP request body")
  814. }
  815. request.Body.Close()
  816. for mi := 0; i < len(rule.Match); i++ {
  817. body = rule.Match[mi].ReplaceAll(body, []byte(rule.Replace[i]))
  818. }
  819. request.Body = io.NopCloser(bytes.NewReader(body))
  820. request.ContentLength = int64(len(body))
  821. }
  822. }
  823. if !requestMatch {
  824. for i, rule := range options.SurgeMapLocal {
  825. if !rule.Pattern.MatchString(requestURL) {
  826. continue
  827. }
  828. requestMatch = true
  829. e.logger.DebugContext(ctx, "match map_local[", i, "] => ", rule.String())
  830. go func() {
  831. io.Copy(io.Discard, request.Body)
  832. request.Body.Close()
  833. }()
  834. var (
  835. statusCode = http.StatusOK
  836. headers = make(http.Header)
  837. body []byte
  838. )
  839. if rule.StatusCode > 0 {
  840. statusCode = rule.StatusCode
  841. }
  842. switch {
  843. case rule.File:
  844. resource, err := os.ReadFile(rule.Data)
  845. if err != nil {
  846. return E.Cause(err, "open map local source")
  847. }
  848. mimeType := mime.TypeByExtension(filepath.Ext(rule.Data))
  849. if mimeType == "" {
  850. mimeType = "application/octet-stream"
  851. }
  852. headers.Set("Content-Type", mimeType)
  853. body = resource
  854. case rule.Text:
  855. headers.Set("Content-Type", "text/plain")
  856. body = []byte(rule.Data)
  857. case rule.TinyGif:
  858. headers.Set("Content-Type", "image/gif")
  859. body = surgeTinyGif()
  860. case rule.Base64:
  861. headers.Set("Content-Type", "application/octet-stream")
  862. body = rule.Base64Data
  863. }
  864. for key, values := range headers {
  865. writer.Header()[key] = values
  866. }
  867. writer.WriteHeader(statusCode)
  868. _, err = writer.Write(body)
  869. if err != nil {
  870. return E.Cause(err, "write map local response")
  871. }
  872. return nil
  873. }
  874. }
  875. requestCtx, cancel := context.WithCancel(ctx)
  876. defer cancel()
  877. response, err := e.httpClient.Do(request.WithContext(requestCtx))
  878. if err != nil {
  879. cancel()
  880. return E.Cause(err, "exchange request")
  881. }
  882. var (
  883. responseScript adapter.SurgeScript
  884. responseMatch bool
  885. responseScriptOptions option.MITMRouteSurgeScriptOptions
  886. )
  887. matchResponse:
  888. for _, scriptOptions := range options.Script {
  889. script, loaded := e.script.Script(scriptOptions.Tag)
  890. if !loaded {
  891. e.logger.WarnContext(ctx, "script not found: ", scriptOptions.Tag)
  892. continue
  893. }
  894. surgeScript, isSurge := script.(adapter.SurgeScript)
  895. if !isSurge {
  896. e.logger.WarnContext(ctx, "specified script/", script.Type(), "[", script.Tag(), "] is not a Surge script")
  897. continue
  898. }
  899. for _, pattern := range scriptOptions.Pattern {
  900. if pattern.Build().MatchString(requestURL) {
  901. e.logger.DebugContext(ctx, "match script/", surgeScript.Type(), "[", surgeScript.Tag(), "]")
  902. responseScript = surgeScript
  903. responseScriptOptions = scriptOptions
  904. responseMatch = true
  905. break matchResponse
  906. }
  907. }
  908. }
  909. var responseBody []byte
  910. if options.Print && response.ContentLength > 0 && response.ContentLength <= 131072 {
  911. responseBody, err = io.ReadAll(response.Body)
  912. if err != nil {
  913. return E.Cause(err, "read HTTP response body")
  914. }
  915. response.Body.Close()
  916. response.Body = io.NopCloser(bytes.NewReader(responseBody))
  917. }
  918. if options.Print {
  919. e.printResponse(ctx, request, response, responseBody)
  920. }
  921. if responseScript != nil {
  922. if responseBody == nil && responseScriptOptions.RequiresBody && response.ContentLength > 0 && (responseScriptOptions.MaxSize == 0 && response.ContentLength <= 131072 || response.ContentLength <= responseScriptOptions.MaxSize) {
  923. responseBody, err = io.ReadAll(response.Body)
  924. if err != nil {
  925. return E.Cause(err, "read HTTP response body")
  926. }
  927. response.Body.Close()
  928. response.Body = io.NopCloser(bytes.NewReader(responseBody))
  929. }
  930. var result *adapter.HTTPResponseScriptResult
  931. result, err = responseScript.ExecuteHTTPResponse(ctx, time.Duration(responseScriptOptions.Timeout), request, response, responseBody, responseScriptOptions.BinaryBodyMode, responseScriptOptions.Arguments)
  932. if err != nil {
  933. return E.Cause(err, "execute script/", responseScript.Type(), "[", responseScript.Tag(), "]")
  934. }
  935. if result.Status > 0 {
  936. response.Status = http.StatusText(result.Status)
  937. response.StatusCode = result.Status
  938. }
  939. for key, values := range result.Headers {
  940. response.Header[key] = values
  941. }
  942. if result.Body != nil {
  943. response.Body.Close()
  944. response.Body = io.NopCloser(bytes.NewReader(result.Body))
  945. response.ContentLength = int64(len(result.Body))
  946. }
  947. }
  948. if !responseMatch {
  949. for i, rule := range options.SurgeHeaderRewrite {
  950. if !rule.Response {
  951. continue
  952. }
  953. if !rule.Pattern.MatchString(requestURL) {
  954. continue
  955. }
  956. responseMatch = true
  957. e.logger.DebugContext(ctx, "match header_rewrite[", i, "] => ", rule.String())
  958. switch {
  959. case rule.Add:
  960. response.Header.Add(rule.Key, rule.Value)
  961. case rule.Delete:
  962. response.Header.Del(rule.Key)
  963. case rule.Replace:
  964. if response.Header.Get(rule.Key) != "" {
  965. response.Header.Set(rule.Key, rule.Value)
  966. }
  967. case rule.ReplaceRegex:
  968. if value := response.Header.Get(rule.Key); value != "" {
  969. response.Header.Set(rule.Key, rule.Match.ReplaceAllString(value, rule.Value))
  970. }
  971. }
  972. }
  973. for i, rule := range options.SurgeBodyRewrite {
  974. if !rule.Response {
  975. continue
  976. }
  977. if !rule.Pattern.MatchString(requestURL) {
  978. continue
  979. }
  980. responseMatch = true
  981. e.logger.DebugContext(ctx, "match body_rewrite[", i, "] => ", rule.String())
  982. if responseBody == nil {
  983. if response.ContentLength <= 0 {
  984. e.logger.WarnContext(ctx, "body replace skipped due to non-fixed content length")
  985. break
  986. } else if response.ContentLength > 131072 {
  987. e.logger.WarnContext(ctx, "body replace skipped due to large content length: ", request.ContentLength)
  988. break
  989. }
  990. responseBody, err = io.ReadAll(response.Body)
  991. if err != nil {
  992. return E.Cause(err, "read HTTP request body")
  993. }
  994. response.Body.Close()
  995. }
  996. for mi := 0; i < len(rule.Match); i++ {
  997. responseBody = rule.Match[mi].ReplaceAll(responseBody, []byte(rule.Replace[i]))
  998. }
  999. response.Body = io.NopCloser(bytes.NewReader(responseBody))
  1000. response.ContentLength = int64(len(responseBody))
  1001. }
  1002. }
  1003. if !options.Print && !requestMatch && !responseMatch {
  1004. e.logger.WarnContext(ctx, "request not modified")
  1005. }
  1006. for key, values := range response.Header {
  1007. writer.Header()[key] = values
  1008. }
  1009. writer.WriteHeader(response.StatusCode)
  1010. _, err = io.Copy(writer, response.Body)
  1011. response.Body.Close()
  1012. if err != nil {
  1013. return E.Cause(err, "write HTTP response")
  1014. }
  1015. return nil
  1016. }
  1017. func (e *Engine) printRequest(ctx context.Context, request *http.Request, body []byte) {
  1018. var builder strings.Builder
  1019. builder.WriteString(F.ToString(request.Proto, " ", request.Method, " ", request.URL))
  1020. builder.WriteString("\n")
  1021. if request.URL.Hostname() != "" && request.URL.Hostname() != request.Host {
  1022. builder.WriteString("Host: ")
  1023. builder.WriteString(request.Host)
  1024. builder.WriteString("\n")
  1025. }
  1026. for key, values := range request.Header {
  1027. for _, value := range values {
  1028. builder.WriteString(key)
  1029. builder.WriteString(": ")
  1030. builder.WriteString(value)
  1031. builder.WriteString("\n")
  1032. }
  1033. }
  1034. if len(body) > 0 {
  1035. builder.WriteString("\n")
  1036. if !bytes.ContainsFunc(body, func(r rune) bool {
  1037. return !unicode.IsPrint(r) && !unicode.IsSpace(r)
  1038. }) {
  1039. builder.Write(body)
  1040. } else {
  1041. builder.WriteString("(body not printable)")
  1042. }
  1043. }
  1044. e.logger.InfoContext(ctx, "request: ", builder.String())
  1045. }
  1046. func (e *Engine) printResponse(ctx context.Context, request *http.Request, response *http.Response, body []byte) {
  1047. var builder strings.Builder
  1048. builder.WriteString(F.ToString(response.Proto, " ", response.Status, " ", request.URL))
  1049. builder.WriteString("\n")
  1050. for key, values := range response.Header {
  1051. for _, value := range values {
  1052. builder.WriteString(key)
  1053. builder.WriteString(": ")
  1054. builder.WriteString(value)
  1055. builder.WriteString("\n")
  1056. }
  1057. }
  1058. if len(body) > 0 {
  1059. builder.WriteString("\n")
  1060. if !bytes.ContainsFunc(body, func(r rune) bool {
  1061. return !unicode.IsPrint(r) && !unicode.IsSpace(r)
  1062. }) {
  1063. builder.Write(body)
  1064. } else {
  1065. builder.WriteString("(body not printable)")
  1066. }
  1067. }
  1068. e.logger.InfoContext(ctx, "response: ", builder.String())
  1069. }
  1070. type simpleResponseWriter struct {
  1071. statusCode int
  1072. header http.Header
  1073. body bytes.Buffer
  1074. }
  1075. func (w *simpleResponseWriter) Build(request *http.Request) *http.Response {
  1076. return &http.Response{
  1077. StatusCode: w.statusCode,
  1078. Status: http.StatusText(w.statusCode),
  1079. Proto: request.Proto,
  1080. ProtoMajor: request.ProtoMajor,
  1081. ProtoMinor: request.ProtoMinor,
  1082. Header: w.header,
  1083. Body: io.NopCloser(&w.body),
  1084. }
  1085. }
  1086. func (w *simpleResponseWriter) Header() http.Header {
  1087. if w.header == nil {
  1088. w.header = make(http.Header)
  1089. }
  1090. return w.header
  1091. }
  1092. func (w *simpleResponseWriter) Write(b []byte) (int, error) {
  1093. return w.body.Write(b)
  1094. }
  1095. func (w *simpleResponseWriter) WriteHeader(statusCode int) {
  1096. w.statusCode = statusCode
  1097. }