558 lines
15 KiB
Go
558 lines
15 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
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// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package repo
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import (
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"bytes"
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"compress/gzip"
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"fmt"
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"net/http"
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"os"
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"os/exec"
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"path"
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"regexp"
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"strconv"
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"strings"
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"time"
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"code.gitea.io/gitea/models"
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"code.gitea.io/gitea/modules/auth"
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"code.gitea.io/gitea/modules/base"
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"code.gitea.io/gitea/modules/context"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/util"
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)
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// HTTP implmentation git smart HTTP protocol
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func HTTP(ctx *context.Context) {
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if len(setting.Repository.AccessControlAllowOrigin) > 0 {
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allowedOrigin := setting.Repository.AccessControlAllowOrigin
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// Set CORS headers for browser-based git clients
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ctx.Resp.Header().Set("Access-Control-Allow-Origin", allowedOrigin)
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ctx.Resp.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization, User-Agent")
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// Handle preflight OPTIONS request
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if ctx.Req.Method == "OPTIONS" {
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if allowedOrigin == "*" {
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ctx.Status(http.StatusOK)
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} else if allowedOrigin == "null" {
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ctx.Status(http.StatusForbidden)
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} else {
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origin := ctx.Req.Header.Get("Origin")
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if len(origin) > 0 && origin == allowedOrigin {
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ctx.Status(http.StatusOK)
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} else {
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ctx.Status(http.StatusForbidden)
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}
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}
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return
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}
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}
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username := ctx.Params(":username")
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reponame := strings.TrimSuffix(ctx.Params(":reponame"), ".git")
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if ctx.Query("go-get") == "1" {
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context.EarlyResponseForGoGetMeta(ctx)
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return
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}
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var isPull bool
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service := ctx.Query("service")
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if service == "git-receive-pack" ||
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strings.HasSuffix(ctx.Req.URL.Path, "git-receive-pack") {
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isPull = false
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} else if service == "git-upload-pack" ||
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strings.HasSuffix(ctx.Req.URL.Path, "git-upload-pack") {
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isPull = true
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} else if service == "git-upload-archive" ||
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strings.HasSuffix(ctx.Req.URL.Path, "git-upload-archive") {
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isPull = true
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} else {
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isPull = (ctx.Req.Method == "GET")
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}
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var accessMode models.AccessMode
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if isPull {
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accessMode = models.AccessModeRead
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} else {
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accessMode = models.AccessModeWrite
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}
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isWiki := false
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var unitType = models.UnitTypeCode
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if strings.HasSuffix(reponame, ".wiki") {
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isWiki = true
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unitType = models.UnitTypeWiki
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reponame = reponame[:len(reponame)-5]
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}
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owner, err := models.GetUserByName(username)
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if err != nil {
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ctx.NotFoundOrServerError("GetUserByName", models.IsErrUserNotExist, err)
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return
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}
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repo, err := models.GetRepositoryByName(owner.ID, reponame)
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if err != nil {
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if models.IsErrRepoNotExist(err) {
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redirectRepoID, err := models.LookupRepoRedirect(owner.ID, reponame)
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if err == nil {
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context.RedirectToRepo(ctx, redirectRepoID)
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} else {
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ctx.NotFoundOrServerError("GetRepositoryByName", models.IsErrRepoRedirectNotExist, err)
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}
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} else {
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ctx.ServerError("GetRepositoryByName", err)
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}
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return
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}
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// Don't allow pushing if the repo is archived
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if repo.IsArchived && !isPull {
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ctx.HandleText(http.StatusForbidden, "This repo is archived. You can view files and clone it, but cannot push or open issues/pull-requests.")
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return
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}
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// Only public pull don't need auth.
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isPublicPull := !repo.IsPrivate && isPull
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var (
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askAuth = !isPublicPull || setting.Service.RequireSignInView
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authUser *models.User
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authUsername string
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authPasswd string
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environ []string
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)
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// check access
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if askAuth {
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authUsername = ctx.Req.Header.Get(setting.ReverseProxyAuthUser)
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if setting.Service.EnableReverseProxyAuth && len(authUsername) > 0 {
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authUser, err = models.GetUserByName(authUsername)
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if err != nil {
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ctx.HandleText(401, "reverse proxy login error, got error while running GetUserByName")
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return
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}
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} else {
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authHead := ctx.Req.Header.Get("Authorization")
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if len(authHead) == 0 {
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ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=\".\"")
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ctx.Error(http.StatusUnauthorized)
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return
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}
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auths := strings.Fields(authHead)
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// currently check basic auth
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// TODO: support digit auth
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// FIXME: middlewares/context.go did basic auth check already,
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// maybe could use that one.
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if len(auths) != 2 || auths[0] != "Basic" {
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ctx.HandleText(http.StatusUnauthorized, "no basic auth and digit auth")
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return
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}
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authUsername, authPasswd, err = base.BasicAuthDecode(auths[1])
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if err != nil {
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ctx.HandleText(http.StatusUnauthorized, "no basic auth and digit auth")
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return
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}
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// Check if username or password is a token
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isUsernameToken := len(authPasswd) == 0 || authPasswd == "x-oauth-basic"
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// Assume username is token
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authToken := authUsername
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if !isUsernameToken {
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// Assume password is token
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authToken = authPasswd
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}
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uid := auth.CheckOAuthAccessToken(authToken)
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if uid != 0 {
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ctx.Data["IsApiToken"] = true
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authUser, err = models.GetUserByID(uid)
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if err != nil {
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ctx.ServerError("GetUserByID", err)
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return
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}
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}
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// Assume password is a token.
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token, err := models.GetAccessTokenBySHA(authToken)
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if err == nil {
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if isUsernameToken {
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authUser, err = models.GetUserByID(token.UID)
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if err != nil {
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ctx.ServerError("GetUserByID", err)
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return
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}
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} else {
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authUser, err = models.GetUserByName(authUsername)
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if err != nil {
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if models.IsErrUserNotExist(err) {
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ctx.HandleText(http.StatusUnauthorized, "invalid credentials")
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} else {
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ctx.ServerError("GetUserByName", err)
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}
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return
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}
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if authUser.ID != token.UID {
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ctx.HandleText(http.StatusUnauthorized, "invalid credentials")
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return
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}
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}
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token.UpdatedUnix = util.TimeStampNow()
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if err = models.UpdateAccessToken(token); err != nil {
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ctx.ServerError("UpdateAccessToken", err)
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}
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} else {
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if !models.IsErrAccessTokenNotExist(err) && !models.IsErrAccessTokenEmpty(err) {
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log.Error("GetAccessTokenBySha: %v", err)
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}
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}
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if authUser == nil {
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// Check username and password
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authUser, err = models.UserSignIn(authUsername, authPasswd)
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if err != nil {
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if !models.IsErrUserNotExist(err) {
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ctx.ServerError("UserSignIn error: %v", err)
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return
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}
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}
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if authUser == nil {
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ctx.HandleText(http.StatusUnauthorized, "invalid credentials")
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return
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}
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_, err = models.GetTwoFactorByUID(authUser.ID)
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if err == nil {
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// TODO: This response should be changed to "invalid credentials" for security reasons once the expectation behind it (creating an app token to authenticate) is properly documented
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ctx.HandleText(http.StatusUnauthorized, "Users with two-factor authentication enabled cannot perform HTTP/HTTPS operations via plain username and password. Please create and use a personal access token on the user settings page")
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return
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} else if !models.IsErrTwoFactorNotEnrolled(err) {
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ctx.ServerError("IsErrTwoFactorNotEnrolled", err)
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return
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}
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}
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}
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perm, err := models.GetUserRepoPermission(repo, authUser)
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if err != nil {
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ctx.ServerError("GetUserRepoPermission", err)
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return
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}
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if !perm.CanAccess(accessMode, unitType) {
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ctx.HandleText(http.StatusForbidden, "User permission denied")
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return
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}
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if !isPull && repo.IsMirror {
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ctx.HandleText(http.StatusForbidden, "mirror repository is read-only")
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return
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}
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environ = []string{
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models.EnvRepoUsername + "=" + username,
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models.EnvRepoName + "=" + reponame,
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models.EnvPusherName + "=" + authUser.Name,
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models.EnvPusherID + fmt.Sprintf("=%d", authUser.ID),
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models.ProtectedBranchRepoID + fmt.Sprintf("=%d", repo.ID),
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}
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if !authUser.KeepEmailPrivate {
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environ = append(environ, models.EnvPusherEmail+"="+authUser.Email)
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}
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if isWiki {
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environ = append(environ, models.EnvRepoIsWiki+"=true")
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} else {
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environ = append(environ, models.EnvRepoIsWiki+"=false")
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}
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}
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HTTPBackend(ctx, &serviceConfig{
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UploadPack: true,
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ReceivePack: true,
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Env: environ,
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})(ctx.Resp, ctx.Req.Request)
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}
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type serviceConfig struct {
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UploadPack bool
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ReceivePack bool
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Env []string
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}
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type serviceHandler struct {
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cfg *serviceConfig
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w http.ResponseWriter
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r *http.Request
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dir string
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file string
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environ []string
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}
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func (h *serviceHandler) setHeaderNoCache() {
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h.w.Header().Set("Expires", "Fri, 01 Jan 1980 00:00:00 GMT")
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h.w.Header().Set("Pragma", "no-cache")
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h.w.Header().Set("Cache-Control", "no-cache, max-age=0, must-revalidate")
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}
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func (h *serviceHandler) setHeaderCacheForever() {
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now := time.Now().Unix()
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expires := now + 31536000
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h.w.Header().Set("Date", fmt.Sprintf("%d", now))
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h.w.Header().Set("Expires", fmt.Sprintf("%d", expires))
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h.w.Header().Set("Cache-Control", "public, max-age=31536000")
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}
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func (h *serviceHandler) sendFile(contentType string) {
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reqFile := path.Join(h.dir, h.file)
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fi, err := os.Stat(reqFile)
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if os.IsNotExist(err) {
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h.w.WriteHeader(http.StatusNotFound)
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return
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}
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h.w.Header().Set("Content-Type", contentType)
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h.w.Header().Set("Content-Length", fmt.Sprintf("%d", fi.Size()))
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h.w.Header().Set("Last-Modified", fi.ModTime().Format(http.TimeFormat))
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http.ServeFile(h.w, h.r, reqFile)
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}
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type route struct {
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reg *regexp.Regexp
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method string
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handler func(serviceHandler)
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}
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var routes = []route{
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{regexp.MustCompile("(.*?)/git-upload-pack$"), "POST", serviceUploadPack},
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{regexp.MustCompile("(.*?)/git-receive-pack$"), "POST", serviceReceivePack},
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{regexp.MustCompile("(.*?)/info/refs$"), "GET", getInfoRefs},
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{regexp.MustCompile("(.*?)/HEAD$"), "GET", getTextFile},
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{regexp.MustCompile("(.*?)/objects/info/alternates$"), "GET", getTextFile},
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{regexp.MustCompile("(.*?)/objects/info/http-alternates$"), "GET", getTextFile},
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{regexp.MustCompile("(.*?)/objects/info/packs$"), "GET", getInfoPacks},
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{regexp.MustCompile("(.*?)/objects/info/[^/]*$"), "GET", getTextFile},
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{regexp.MustCompile("(.*?)/objects/[0-9a-f]{2}/[0-9a-f]{38}$"), "GET", getLooseObject},
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{regexp.MustCompile("(.*?)/objects/pack/pack-[0-9a-f]{40}\\.pack$"), "GET", getPackFile},
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{regexp.MustCompile("(.*?)/objects/pack/pack-[0-9a-f]{40}\\.idx$"), "GET", getIdxFile},
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}
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// FIXME: use process module
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func gitCommand(dir string, args ...string) []byte {
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cmd := exec.Command("git", args...)
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cmd.Dir = dir
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out, err := cmd.Output()
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if err != nil {
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log.GitLogger.Error(fmt.Sprintf("%v - %s", err, out))
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}
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return out
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}
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func getGitConfig(option, dir string) string {
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out := string(gitCommand(dir, "config", option))
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return out[0 : len(out)-1]
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}
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func getConfigSetting(service, dir string) bool {
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service = strings.Replace(service, "-", "", -1)
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setting := getGitConfig("http."+service, dir)
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if service == "uploadpack" {
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return setting != "false"
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}
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return setting == "true"
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}
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func hasAccess(service string, h serviceHandler, checkContentType bool) bool {
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if checkContentType {
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if h.r.Header.Get("Content-Type") != fmt.Sprintf("application/x-git-%s-request", service) {
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return false
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}
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}
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if !(service == "upload-pack" || service == "receive-pack") {
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return false
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}
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if service == "receive-pack" {
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return h.cfg.ReceivePack
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}
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if service == "upload-pack" {
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return h.cfg.UploadPack
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}
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return getConfigSetting(service, h.dir)
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}
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func serviceRPC(h serviceHandler, service string) {
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defer h.r.Body.Close()
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if !hasAccess(service, h, true) {
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h.w.WriteHeader(http.StatusUnauthorized)
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return
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}
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h.w.Header().Set("Content-Type", fmt.Sprintf("application/x-git-%s-result", service))
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var err error
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var reqBody = h.r.Body
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// Handle GZIP.
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if h.r.Header.Get("Content-Encoding") == "gzip" {
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reqBody, err = gzip.NewReader(reqBody)
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if err != nil {
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log.GitLogger.Error("Fail to create gzip reader: %v", err)
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h.w.WriteHeader(http.StatusInternalServerError)
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return
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}
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}
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// set this for allow pre-receive and post-receive execute
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h.environ = append(h.environ, "SSH_ORIGINAL_COMMAND="+service)
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var stderr bytes.Buffer
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cmd := exec.Command("git", service, "--stateless-rpc", h.dir)
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cmd.Dir = h.dir
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if service == "receive-pack" {
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cmd.Env = append(os.Environ(), h.environ...)
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}
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cmd.Stdout = h.w
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cmd.Stdin = reqBody
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cmd.Stderr = &stderr
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if err := cmd.Run(); err != nil {
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log.GitLogger.Error("Fail to serve RPC(%s): %v - %v", service, err, stderr)
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return
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}
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}
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func serviceUploadPack(h serviceHandler) {
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serviceRPC(h, "upload-pack")
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}
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func serviceReceivePack(h serviceHandler) {
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serviceRPC(h, "receive-pack")
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}
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func getServiceType(r *http.Request) string {
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serviceType := r.FormValue("service")
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if !strings.HasPrefix(serviceType, "git-") {
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return ""
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}
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return strings.Replace(serviceType, "git-", "", 1)
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}
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func updateServerInfo(dir string) []byte {
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return gitCommand(dir, "update-server-info")
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}
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func packetWrite(str string) []byte {
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s := strconv.FormatInt(int64(len(str)+4), 16)
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if len(s)%4 != 0 {
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s = strings.Repeat("0", 4-len(s)%4) + s
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}
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return []byte(s + str)
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}
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func getInfoRefs(h serviceHandler) {
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h.setHeaderNoCache()
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if hasAccess(getServiceType(h.r), h, false) {
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service := getServiceType(h.r)
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refs := gitCommand(h.dir, service, "--stateless-rpc", "--advertise-refs", ".")
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h.w.Header().Set("Content-Type", fmt.Sprintf("application/x-git-%s-advertisement", service))
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h.w.WriteHeader(http.StatusOK)
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h.w.Write(packetWrite("# service=git-" + service + "\n"))
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h.w.Write([]byte("0000"))
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h.w.Write(refs)
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} else {
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updateServerInfo(h.dir)
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h.sendFile("text/plain; charset=utf-8")
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}
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}
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func getTextFile(h serviceHandler) {
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h.setHeaderNoCache()
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h.sendFile("text/plain")
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}
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func getInfoPacks(h serviceHandler) {
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h.setHeaderCacheForever()
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h.sendFile("text/plain; charset=utf-8")
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}
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func getLooseObject(h serviceHandler) {
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h.setHeaderCacheForever()
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h.sendFile("application/x-git-loose-object")
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}
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func getPackFile(h serviceHandler) {
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h.setHeaderCacheForever()
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h.sendFile("application/x-git-packed-objects")
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}
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func getIdxFile(h serviceHandler) {
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h.setHeaderCacheForever()
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h.sendFile("application/x-git-packed-objects-toc")
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}
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func getGitRepoPath(subdir string) (string, error) {
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if !strings.HasSuffix(subdir, ".git") {
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subdir += ".git"
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}
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fpath := path.Join(setting.RepoRootPath, subdir)
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if _, err := os.Stat(fpath); os.IsNotExist(err) {
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return "", err
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}
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return fpath, nil
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}
|
|
|
|
// HTTPBackend middleware for git smart HTTP protocol
|
|
func HTTPBackend(ctx *context.Context, cfg *serviceConfig) http.HandlerFunc {
|
|
return func(w http.ResponseWriter, r *http.Request) {
|
|
for _, route := range routes {
|
|
r.URL.Path = strings.ToLower(r.URL.Path) // blue: In case some repo name has upper case name
|
|
if m := route.reg.FindStringSubmatch(r.URL.Path); m != nil {
|
|
if setting.Repository.DisableHTTPGit {
|
|
w.WriteHeader(http.StatusForbidden)
|
|
w.Write([]byte("Interacting with repositories by HTTP protocol is not allowed"))
|
|
return
|
|
}
|
|
if route.method != r.Method {
|
|
if r.Proto == "HTTP/1.1" {
|
|
w.WriteHeader(http.StatusMethodNotAllowed)
|
|
w.Write([]byte("Method Not Allowed"))
|
|
} else {
|
|
w.WriteHeader(http.StatusBadRequest)
|
|
w.Write([]byte("Bad Request"))
|
|
}
|
|
return
|
|
}
|
|
|
|
file := strings.Replace(r.URL.Path, m[1]+"/", "", 1)
|
|
dir, err := getGitRepoPath(m[1])
|
|
if err != nil {
|
|
log.GitLogger.Error(err.Error())
|
|
ctx.NotFound("HTTPBackend", err)
|
|
return
|
|
}
|
|
|
|
route.handler(serviceHandler{cfg, w, r, dir, file, cfg.Env})
|
|
return
|
|
}
|
|
}
|
|
|
|
ctx.NotFound("HTTPBackend", nil)
|
|
return
|
|
}
|
|
}
|