http.go 12 KB

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  1. // Copyright 2017 The Gogs Authors. All rights reserved.
  2. // Use of this source code is governed by a MIT-style
  3. // license that can be found in the LICENSE file.
  4. package repo
  5. import (
  6. "bytes"
  7. "compress/gzip"
  8. "fmt"
  9. "net/http"
  10. "os"
  11. "os/exec"
  12. "path"
  13. "regexp"
  14. "strconv"
  15. "strings"
  16. "time"
  17. "github.com/Unknwon/com"
  18. log "gopkg.in/clog.v1"
  19. "gopkg.in/macaron.v1"
  20. "github.com/gogits/gogs/models"
  21. "github.com/gogits/gogs/models/errors"
  22. "github.com/gogits/gogs/pkg/context"
  23. "github.com/gogits/gogs/pkg/setting"
  24. "github.com/gogits/gogs/pkg/tool"
  25. )
  26. const (
  27. ENV_AUTH_USER_ID = "GOGS_AUTH_USER_ID"
  28. ENV_AUTH_USER_NAME = "GOGS_AUTH_USER_NAME"
  29. ENV_AUTH_USER_EMAIL = "GOGS_AUTH_USER_EMAIL"
  30. ENV_REPO_OWNER_NAME = "GOGS_REPO_OWNER_NAME"
  31. ENV_REPO_OWNER_SALT_MD5 = "GOGS_REPO_OWNER_SALT_MD5"
  32. ENV_REPO_ID = "GOGS_REPO_ID"
  33. ENV_REPO_NAME = "GOGS_REPO_NAME"
  34. ENV_REPO_CUSTOM_HOOKS_PATH = "GOGS_REPO_CUSTOM_HOOKS_PATH"
  35. )
  36. type HTTPContext struct {
  37. *context.Context
  38. OwnerName string
  39. OwnerSalt string
  40. RepoID int64
  41. RepoName string
  42. AuthUser *models.User
  43. }
  44. // askCredentials responses HTTP header and status which informs client to provide credentials.
  45. func askCredentials(c *context.Context, status int, text string) {
  46. c.Resp.Header().Set("WWW-Authenticate", "Basic realm=\".\"")
  47. c.HandleText(status, text)
  48. }
  49. func HTTPContexter() macaron.Handler {
  50. return func(c *context.Context) {
  51. ownerName := c.Params(":username")
  52. repoName := strings.TrimSuffix(c.Params(":reponame"), ".git")
  53. repoName = strings.TrimSuffix(repoName, ".wiki")
  54. isPull := c.Query("service") == "git-upload-pack" ||
  55. strings.HasSuffix(c.Req.URL.Path, "git-upload-pack") ||
  56. c.Req.Method == "GET"
  57. owner, err := models.GetUserByName(ownerName)
  58. if err != nil {
  59. c.NotFoundOrServerError("GetUserByName", errors.IsUserNotExist, err)
  60. return
  61. }
  62. repo, err := models.GetRepositoryByName(owner.ID, repoName)
  63. if err != nil {
  64. c.NotFoundOrServerError("GetRepositoryByName", errors.IsRepoNotExist, err)
  65. return
  66. }
  67. // Authentication is not required for pulling from public repositories.
  68. if isPull && !repo.IsPrivate && !setting.Service.RequireSignInView {
  69. c.Map(&HTTPContext{
  70. Context: c,
  71. })
  72. return
  73. }
  74. // In case user requested a wrong URL and not intended to access Git objects.
  75. action := c.Params("*")
  76. if !strings.Contains(action, "git-") &&
  77. !strings.Contains(action, "info/") &&
  78. !strings.Contains(action, "HEAD") &&
  79. !strings.Contains(action, "objects/") {
  80. c.NotFound()
  81. return
  82. }
  83. // Handle HTTP Basic Authentication
  84. authHead := c.Req.Header.Get("Authorization")
  85. if len(authHead) == 0 {
  86. askCredentials(c, http.StatusUnauthorized, "")
  87. return
  88. }
  89. auths := strings.Fields(authHead)
  90. if len(auths) != 2 || auths[0] != "Basic" {
  91. askCredentials(c, http.StatusUnauthorized, "")
  92. return
  93. }
  94. authUsername, authPassword, err := tool.BasicAuthDecode(auths[1])
  95. if err != nil {
  96. askCredentials(c, http.StatusUnauthorized, "")
  97. return
  98. }
  99. authUser, err := models.UserSignIn(authUsername, authPassword)
  100. if err != nil && !errors.IsUserNotExist(err) {
  101. c.Handle(http.StatusInternalServerError, "UserSignIn", err)
  102. return
  103. }
  104. // If username and password combination failed, try again using username as a token.
  105. if authUser == nil {
  106. token, err := models.GetAccessTokenBySHA(authUsername)
  107. if err != nil {
  108. if models.IsErrAccessTokenEmpty(err) || models.IsErrAccessTokenNotExist(err) {
  109. askCredentials(c, http.StatusUnauthorized, "")
  110. } else {
  111. c.Handle(http.StatusInternalServerError, "GetAccessTokenBySHA", err)
  112. }
  113. return
  114. }
  115. token.Updated = time.Now()
  116. authUser, err = models.GetUserByID(token.UID)
  117. if err != nil {
  118. // Once we found token, we're supposed to find its related user,
  119. // thus any error is unexpected.
  120. c.Handle(http.StatusInternalServerError, "GetUserByID", err)
  121. return
  122. }
  123. } else if authUser.IsEnabledTwoFactor() {
  124. askCredentials(c, http.StatusUnauthorized, `User with two-factor authentication enabled cannot perform HTTP/HTTPS operations via plain username and password
  125. Please create and use personal access token on user settings page`)
  126. return
  127. }
  128. log.Trace("HTTPGit - Authenticated user: %s", authUser.Name)
  129. mode := models.ACCESS_MODE_WRITE
  130. if isPull {
  131. mode = models.ACCESS_MODE_READ
  132. }
  133. has, err := models.HasAccess(authUser.ID, repo, mode)
  134. if err != nil {
  135. c.Handle(http.StatusInternalServerError, "HasAccess", err)
  136. return
  137. } else if !has {
  138. askCredentials(c, http.StatusForbidden, "User permission denied")
  139. return
  140. }
  141. if !isPull && repo.IsMirror {
  142. c.HandleText(http.StatusForbidden, "Mirror repository is read-only")
  143. return
  144. }
  145. c.Map(&HTTPContext{
  146. Context: c,
  147. OwnerName: ownerName,
  148. OwnerSalt: owner.Salt,
  149. RepoID: repo.ID,
  150. RepoName: repoName,
  151. AuthUser: authUser,
  152. })
  153. }
  154. }
  155. type serviceHandler struct {
  156. w http.ResponseWriter
  157. r *http.Request
  158. dir string
  159. file string
  160. authUser *models.User
  161. ownerName string
  162. ownerSalt string
  163. repoID int64
  164. repoName string
  165. }
  166. func (h *serviceHandler) setHeaderNoCache() {
  167. h.w.Header().Set("Expires", "Fri, 01 Jan 1980 00:00:00 GMT")
  168. h.w.Header().Set("Pragma", "no-cache")
  169. h.w.Header().Set("Cache-Control", "no-cache, max-age=0, must-revalidate")
  170. }
  171. func (h *serviceHandler) setHeaderCacheForever() {
  172. now := time.Now().Unix()
  173. expires := now + 31536000
  174. h.w.Header().Set("Date", fmt.Sprintf("%d", now))
  175. h.w.Header().Set("Expires", fmt.Sprintf("%d", expires))
  176. h.w.Header().Set("Cache-Control", "public, max-age=31536000")
  177. }
  178. func (h *serviceHandler) sendFile(contentType string) {
  179. reqFile := path.Join(h.dir, h.file)
  180. fi, err := os.Stat(reqFile)
  181. if os.IsNotExist(err) {
  182. h.w.WriteHeader(http.StatusNotFound)
  183. return
  184. }
  185. h.w.Header().Set("Content-Type", contentType)
  186. h.w.Header().Set("Content-Length", fmt.Sprintf("%d", fi.Size()))
  187. h.w.Header().Set("Last-Modified", fi.ModTime().Format(http.TimeFormat))
  188. http.ServeFile(h.w, h.r, reqFile)
  189. }
  190. type ComposeHookEnvsOptions struct {
  191. AuthUser *models.User
  192. OwnerName string
  193. OwnerSalt string
  194. RepoID int64
  195. RepoName string
  196. RepoPath string
  197. }
  198. func ComposeHookEnvs(opts ComposeHookEnvsOptions) []string {
  199. envs := []string{
  200. "SSH_ORIGINAL_COMMAND=1",
  201. ENV_AUTH_USER_ID + "=" + com.ToStr(opts.AuthUser.ID),
  202. ENV_AUTH_USER_NAME + "=" + opts.AuthUser.Name,
  203. ENV_AUTH_USER_EMAIL + "=" + opts.AuthUser.Email,
  204. ENV_REPO_OWNER_NAME + "=" + opts.OwnerName,
  205. ENV_REPO_OWNER_SALT_MD5 + "=" + tool.MD5(opts.OwnerSalt),
  206. ENV_REPO_ID + "=" + com.ToStr(opts.RepoID),
  207. ENV_REPO_NAME + "=" + opts.RepoName,
  208. ENV_REPO_CUSTOM_HOOKS_PATH + "=" + path.Join(opts.RepoPath, "custom_hooks"),
  209. }
  210. return envs
  211. }
  212. func serviceRPC(h serviceHandler, service string) {
  213. defer h.r.Body.Close()
  214. if h.r.Header.Get("Content-Type") != fmt.Sprintf("application/x-git-%s-request", service) {
  215. h.w.WriteHeader(http.StatusUnauthorized)
  216. return
  217. }
  218. h.w.Header().Set("Content-Type", fmt.Sprintf("application/x-git-%s-result", service))
  219. var (
  220. reqBody = h.r.Body
  221. err error
  222. )
  223. // Handle GZIP
  224. if h.r.Header.Get("Content-Encoding") == "gzip" {
  225. reqBody, err = gzip.NewReader(reqBody)
  226. if err != nil {
  227. log.Error(2, "HTTP.Get: fail to create gzip reader: %v", err)
  228. h.w.WriteHeader(http.StatusInternalServerError)
  229. return
  230. }
  231. }
  232. var stderr bytes.Buffer
  233. cmd := exec.Command("git", service, "--stateless-rpc", h.dir)
  234. if service == "receive-pack" {
  235. cmd.Env = append(os.Environ(), ComposeHookEnvs(ComposeHookEnvsOptions{
  236. AuthUser: h.authUser,
  237. OwnerName: h.ownerName,
  238. OwnerSalt: h.ownerSalt,
  239. RepoID: h.repoID,
  240. RepoName: h.repoName,
  241. RepoPath: h.dir,
  242. })...)
  243. }
  244. cmd.Dir = h.dir
  245. cmd.Stdout = h.w
  246. cmd.Stderr = &stderr
  247. cmd.Stdin = reqBody
  248. if err = cmd.Run(); err != nil {
  249. log.Error(2, "HTTP.serviceRPC: fail to serve RPC '%s': %v - %s", service, err, stderr)
  250. h.w.WriteHeader(http.StatusInternalServerError)
  251. return
  252. }
  253. }
  254. func serviceUploadPack(h serviceHandler) {
  255. serviceRPC(h, "upload-pack")
  256. }
  257. func serviceReceivePack(h serviceHandler) {
  258. serviceRPC(h, "receive-pack")
  259. }
  260. func getServiceType(r *http.Request) string {
  261. serviceType := r.FormValue("service")
  262. if !strings.HasPrefix(serviceType, "git-") {
  263. return ""
  264. }
  265. return strings.TrimPrefix(serviceType, "git-")
  266. }
  267. // FIXME: use process module
  268. func gitCommand(dir string, args ...string) []byte {
  269. cmd := exec.Command("git", args...)
  270. cmd.Dir = dir
  271. out, err := cmd.Output()
  272. if err != nil {
  273. log.Error(2, fmt.Sprintf("Git: %v - %s", err, out))
  274. }
  275. return out
  276. }
  277. func updateServerInfo(dir string) []byte {
  278. return gitCommand(dir, "update-server-info")
  279. }
  280. func packetWrite(str string) []byte {
  281. s := strconv.FormatInt(int64(len(str)+4), 16)
  282. if len(s)%4 != 0 {
  283. s = strings.Repeat("0", 4-len(s)%4) + s
  284. }
  285. return []byte(s + str)
  286. }
  287. func getInfoRefs(h serviceHandler) {
  288. h.setHeaderNoCache()
  289. service := getServiceType(h.r)
  290. if service != "upload-pack" && service != "receive-pack" {
  291. updateServerInfo(h.dir)
  292. h.sendFile("text/plain; charset=utf-8")
  293. return
  294. }
  295. refs := gitCommand(h.dir, service, "--stateless-rpc", "--advertise-refs", ".")
  296. h.w.Header().Set("Content-Type", fmt.Sprintf("application/x-git-%s-advertisement", service))
  297. h.w.WriteHeader(http.StatusOK)
  298. h.w.Write(packetWrite("# service=git-" + service + "\n"))
  299. h.w.Write([]byte("0000"))
  300. h.w.Write(refs)
  301. }
  302. func getTextFile(h serviceHandler) {
  303. h.setHeaderNoCache()
  304. h.sendFile("text/plain")
  305. }
  306. func getInfoPacks(h serviceHandler) {
  307. h.setHeaderCacheForever()
  308. h.sendFile("text/plain; charset=utf-8")
  309. }
  310. func getLooseObject(h serviceHandler) {
  311. h.setHeaderCacheForever()
  312. h.sendFile("application/x-git-loose-object")
  313. }
  314. func getPackFile(h serviceHandler) {
  315. h.setHeaderCacheForever()
  316. h.sendFile("application/x-git-packed-objects")
  317. }
  318. func getIdxFile(h serviceHandler) {
  319. h.setHeaderCacheForever()
  320. h.sendFile("application/x-git-packed-objects-toc")
  321. }
  322. var routes = []struct {
  323. reg *regexp.Regexp
  324. method string
  325. handler func(serviceHandler)
  326. }{
  327. {regexp.MustCompile("(.*?)/git-upload-pack$"), "POST", serviceUploadPack},
  328. {regexp.MustCompile("(.*?)/git-receive-pack$"), "POST", serviceReceivePack},
  329. {regexp.MustCompile("(.*?)/info/refs$"), "GET", getInfoRefs},
  330. {regexp.MustCompile("(.*?)/HEAD$"), "GET", getTextFile},
  331. {regexp.MustCompile("(.*?)/objects/info/alternates$"), "GET", getTextFile},
  332. {regexp.MustCompile("(.*?)/objects/info/http-alternates$"), "GET", getTextFile},
  333. {regexp.MustCompile("(.*?)/objects/info/packs$"), "GET", getInfoPacks},
  334. {regexp.MustCompile("(.*?)/objects/info/[^/]*$"), "GET", getTextFile},
  335. {regexp.MustCompile("(.*?)/objects/[0-9a-f]{2}/[0-9a-f]{38}$"), "GET", getLooseObject},
  336. {regexp.MustCompile("(.*?)/objects/pack/pack-[0-9a-f]{40}\\.pack$"), "GET", getPackFile},
  337. {regexp.MustCompile("(.*?)/objects/pack/pack-[0-9a-f]{40}\\.idx$"), "GET", getIdxFile},
  338. }
  339. func getGitRepoPath(dir string) (string, error) {
  340. if !strings.HasSuffix(dir, ".git") {
  341. dir += ".git"
  342. }
  343. filename := path.Join(setting.RepoRootPath, dir)
  344. if _, err := os.Stat(filename); os.IsNotExist(err) {
  345. return "", err
  346. }
  347. return filename, nil
  348. }
  349. func HTTP(ctx *HTTPContext) {
  350. for _, route := range routes {
  351. reqPath := strings.ToLower(ctx.Req.URL.Path)
  352. m := route.reg.FindStringSubmatch(reqPath)
  353. if m == nil {
  354. continue
  355. }
  356. // We perform check here because routes matched in cmd/web.go is wider than needed,
  357. // but we only want to output this message only if user is really trying to access
  358. // Git HTTP endpoints.
  359. if setting.Repository.DisableHTTPGit {
  360. ctx.HandleText(http.StatusForbidden, "Interacting with repositories by HTTP protocol is not disabled")
  361. return
  362. }
  363. if route.method != ctx.Req.Method {
  364. ctx.NotFound()
  365. return
  366. }
  367. file := strings.TrimPrefix(reqPath, m[1]+"/")
  368. dir, err := getGitRepoPath(m[1])
  369. if err != nil {
  370. log.Warn("HTTP.getGitRepoPath: %v", err)
  371. ctx.NotFound()
  372. return
  373. }
  374. route.handler(serviceHandler{
  375. w: ctx.Resp,
  376. r: ctx.Req.Request,
  377. dir: dir,
  378. file: file,
  379. authUser: ctx.AuthUser,
  380. ownerName: ctx.OwnerName,
  381. ownerSalt: ctx.OwnerSalt,
  382. repoID: ctx.RepoID,
  383. repoName: ctx.RepoName,
  384. })
  385. return
  386. }
  387. ctx.NotFound()
  388. }