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