mirror of
https://github.com/go-gitea/gitea
synced 2025-07-22 18:28:37 +00:00
Fix http protocol auth (#27875)
This commit is contained in:
Lunny Xiao
GitHub
613
routers/web/repo/githttp.go
Normal file
613
routers/web/repo/githttp.go
Normal file
@@ -0,0 +1,613 @@
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// Copyright 2014 The Gogs Authors. All rights reserved.
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// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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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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gocontext "context"
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"fmt"
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"net/http"
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"os"
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"path"
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"regexp"
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"strconv"
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"strings"
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"sync"
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"time"
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actions_model "code.gitea.io/gitea/models/actions"
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auth_model "code.gitea.io/gitea/models/auth"
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"code.gitea.io/gitea/models/perm"
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access_model "code.gitea.io/gitea/models/perm/access"
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repo_model "code.gitea.io/gitea/models/repo"
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"code.gitea.io/gitea/models/unit"
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"code.gitea.io/gitea/modules/context"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/log"
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repo_module "code.gitea.io/gitea/modules/repository"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/structs"
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"code.gitea.io/gitea/modules/util"
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repo_service "code.gitea.io/gitea/services/repository"
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"github.com/go-chi/cors"
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)
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func HTTPGitEnabledHandler(ctx *context.Context) {
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if setting.Repository.DisableHTTPGit {
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ctx.Resp.WriteHeader(http.StatusForbidden)
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_, _ = ctx.Resp.Write([]byte("Interacting with repositories by HTTP protocol is not allowed"))
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}
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}
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func CorsHandler() func(next http.Handler) http.Handler {
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if setting.Repository.AccessControlAllowOrigin != "" {
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return cors.Handler(cors.Options{
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AllowedOrigins: []string{setting.Repository.AccessControlAllowOrigin},
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AllowedHeaders: []string{"Content-Type", "Authorization", "User-Agent"},
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})
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}
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return func(next http.Handler) http.Handler {
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return next
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}
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}
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// httpBase implementation git smart HTTP protocol
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func httpBase(ctx *context.Context) *serviceHandler {
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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.FormString("go-get") == "1" {
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context.EarlyResponseForGoGetMeta(ctx)
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return nil
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}
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var isPull, receivePack bool
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service := ctx.FormString("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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receivePack = true
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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 perm.AccessMode
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if isPull {
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accessMode = perm.AccessModeRead
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} else {
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accessMode = perm.AccessModeWrite
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}
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isWiki := false
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unitType := unit.TypeCode
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var wikiRepoName string
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if strings.HasSuffix(reponame, ".wiki") {
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isWiki = true
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unitType = unit.TypeWiki
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wikiRepoName = reponame
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reponame = reponame[:len(reponame)-5]
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}
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owner := ctx.ContextUser
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if !owner.IsOrganization() && !owner.IsActive {
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ctx.PlainText(http.StatusForbidden, "Repository cannot be accessed. You cannot push or open issues/pull-requests.")
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return nil
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}
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repoExist := true
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repo, err := repo_model.GetRepositoryByName(ctx, owner.ID, reponame)
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if err != nil {
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if repo_model.IsErrRepoNotExist(err) {
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if redirectRepoID, err := repo_model.LookupRedirect(ctx, owner.ID, reponame); err == nil {
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context.RedirectToRepo(ctx.Base, redirectRepoID)
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return nil
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}
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repoExist = false
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} else {
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ctx.ServerError("GetRepositoryByName", err)
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return nil
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}
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}
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// Don't allow pushing if the repo is archived
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if repoExist && repo.IsArchived && !isPull {
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ctx.PlainText(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 nil
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}
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// Only public pull don't need auth.
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isPublicPull := repoExist && !repo.IsPrivate && isPull
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var (
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askAuth = !isPublicPull || setting.Service.RequireSignInView
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environ []string
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)
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// don't allow anonymous pulls if organization is not public
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if isPublicPull {
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if err := repo.LoadOwner(ctx); err != nil {
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ctx.ServerError("LoadOwner", err)
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return nil
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}
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askAuth = askAuth || (repo.Owner.Visibility != structs.VisibleTypePublic)
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}
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// check access
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if askAuth {
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// rely on the results of Contexter
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if !ctx.IsSigned {
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// TODO: support digit auth - which would be Authorization header with digit
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ctx.Resp.Header().Set("WWW-Authenticate", `Basic realm="Gitea"`)
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ctx.Error(http.StatusUnauthorized)
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return nil
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}
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context.CheckRepoScopedToken(ctx, repo, auth_model.GetScopeLevelFromAccessMode(accessMode))
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if ctx.Written() {
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return nil
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}
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if ctx.IsBasicAuth && ctx.Data["IsApiToken"] != true && ctx.Data["IsActionsToken"] != true {
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_, err = auth_model.GetTwoFactorByUID(ctx, ctx.Doer.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.PlainText(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 nil
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} else if !auth_model.IsErrTwoFactorNotEnrolled(err) {
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ctx.ServerError("IsErrTwoFactorNotEnrolled", err)
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return nil
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}
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}
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if !ctx.Doer.IsActive || ctx.Doer.ProhibitLogin {
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ctx.PlainText(http.StatusForbidden, "Your account is disabled.")
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return nil
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}
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environ = []string{
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repo_module.EnvRepoUsername + "=" + username,
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repo_module.EnvRepoName + "=" + reponame,
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repo_module.EnvPusherName + "=" + ctx.Doer.Name,
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repo_module.EnvPusherID + fmt.Sprintf("=%d", ctx.Doer.ID),
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repo_module.EnvAppURL + "=" + setting.AppURL,
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}
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if repoExist {
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// Because of special ref "refs/for" .. , need delay write permission check
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if git.SupportProcReceive {
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accessMode = perm.AccessModeRead
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}
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if ctx.Data["IsActionsToken"] == true {
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taskID := ctx.Data["ActionsTaskID"].(int64)
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task, err := actions_model.GetTaskByID(ctx, taskID)
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if err != nil {
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ctx.ServerError("GetTaskByID", err)
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return nil
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}
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if task.RepoID != repo.ID {
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ctx.PlainText(http.StatusForbidden, "User permission denied")
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return nil
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}
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if task.IsForkPullRequest {
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if accessMode > perm.AccessModeRead {
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ctx.PlainText(http.StatusForbidden, "User permission denied")
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return nil
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}
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environ = append(environ, fmt.Sprintf("%s=%d", repo_module.EnvActionPerm, perm.AccessModeRead))
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} else {
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if accessMode > perm.AccessModeWrite {
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ctx.PlainText(http.StatusForbidden, "User permission denied")
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return nil
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}
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environ = append(environ, fmt.Sprintf("%s=%d", repo_module.EnvActionPerm, perm.AccessModeWrite))
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}
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} else {
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p, err := access_model.GetUserRepoPermission(ctx, repo, ctx.Doer)
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if err != nil {
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ctx.ServerError("GetUserRepoPermission", err)
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return nil
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}
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if !p.CanAccess(accessMode, unitType) {
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ctx.PlainText(http.StatusNotFound, "Repository not found")
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return nil
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}
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}
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if !isPull && repo.IsMirror {
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ctx.PlainText(http.StatusForbidden, "mirror repository is read-only")
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return nil
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}
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}
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if !ctx.Doer.KeepEmailPrivate {
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environ = append(environ, repo_module.EnvPusherEmail+"="+ctx.Doer.Email)
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}
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if isWiki {
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environ = append(environ, repo_module.EnvRepoIsWiki+"=true")
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} else {
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environ = append(environ, repo_module.EnvRepoIsWiki+"=false")
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}
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}
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if !repoExist {
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if !receivePack {
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ctx.PlainText(http.StatusNotFound, "Repository not found")
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return nil
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}
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if isWiki { // you cannot send wiki operation before create the repository
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ctx.PlainText(http.StatusNotFound, "Repository not found")
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return nil
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}
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if owner.IsOrganization() && !setting.Repository.EnablePushCreateOrg {
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ctx.PlainText(http.StatusForbidden, "Push to create is not enabled for organizations.")
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return nil
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}
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if !owner.IsOrganization() && !setting.Repository.EnablePushCreateUser {
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ctx.PlainText(http.StatusForbidden, "Push to create is not enabled for users.")
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return nil
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}
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// Return dummy payload if GET receive-pack
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if ctx.Req.Method == http.MethodGet {
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dummyInfoRefs(ctx)
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return nil
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}
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repo, err = repo_service.PushCreateRepo(ctx, ctx.Doer, owner, reponame)
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if err != nil {
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log.Error("pushCreateRepo: %v", err)
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ctx.Status(http.StatusNotFound)
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return nil
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}
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}
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if isWiki {
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// Ensure the wiki is enabled before we allow access to it
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if _, err := repo.GetUnit(ctx, unit.TypeWiki); err != nil {
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if repo_model.IsErrUnitTypeNotExist(err) {
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ctx.PlainText(http.StatusForbidden, "repository wiki is disabled")
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return nil
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}
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log.Error("Failed to get the wiki unit in %-v Error: %v", repo, err)
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ctx.ServerError("GetUnit(UnitTypeWiki) for "+repo.FullName(), err)
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return nil
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}
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}
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environ = append(environ, repo_module.EnvRepoID+fmt.Sprintf("=%d", repo.ID))
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w := ctx.Resp
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r := ctx.Req
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cfg := &serviceConfig{
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UploadPack: true,
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ReceivePack: true,
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Env: environ,
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}
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r.URL.Path = strings.ToLower(r.URL.Path) // blue: In case some repo name has upper case name
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dir := repo_model.RepoPath(username, reponame)
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if isWiki {
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dir = repo_model.RepoPath(username, wikiRepoName)
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}
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return &serviceHandler{cfg, w, r, dir, cfg.Env}
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}
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var (
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infoRefsCache []byte
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infoRefsOnce sync.Once
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)
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func dummyInfoRefs(ctx *context.Context) {
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infoRefsOnce.Do(func() {
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tmpDir, err := os.MkdirTemp(os.TempDir(), "gitea-info-refs-cache")
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if err != nil {
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log.Error("Failed to create temp dir for git-receive-pack cache: %v", err)
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return
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}
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defer func() {
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if err := util.RemoveAll(tmpDir); err != nil {
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log.Error("RemoveAll: %v", err)
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}
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}()
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if err := git.InitRepository(ctx, tmpDir, true); err != nil {
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log.Error("Failed to init bare repo for git-receive-pack cache: %v", err)
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return
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}
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refs, _, err := git.NewCommand(ctx, "receive-pack", "--stateless-rpc", "--advertise-refs", ".").RunStdBytes(&git.RunOpts{Dir: tmpDir})
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if err != nil {
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log.Error(fmt.Sprintf("%v - %s", err, string(refs)))
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}
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log.Debug("populating infoRefsCache: \n%s", string(refs))
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infoRefsCache = refs
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})
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ctx.RespHeader().Set("Expires", "Fri, 01 Jan 1980 00:00:00 GMT")
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ctx.RespHeader().Set("Pragma", "no-cache")
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ctx.RespHeader().Set("Cache-Control", "no-cache, max-age=0, must-revalidate")
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ctx.RespHeader().Set("Content-Type", "application/x-git-receive-pack-advertisement")
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_, _ = ctx.Write(packetWrite("# service=git-receive-pack\n"))
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_, _ = ctx.Write([]byte("0000"))
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_, _ = ctx.Write(infoRefsCache)
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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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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 containsParentDirectorySeparator(v string) bool {
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if !strings.Contains(v, "..") {
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return false
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}
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for _, ent := range strings.FieldsFunc(v, isSlashRune) {
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if ent == ".." {
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return true
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}
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}
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return false
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}
|
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|
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func isSlashRune(r rune) bool { return r == '/' || r == '\\' }
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|
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func (h *serviceHandler) sendFile(contentType, file string) {
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if containsParentDirectorySeparator(file) {
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log.Error("request file path contains invalid path: %v", file)
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h.w.WriteHeader(http.StatusBadRequest)
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return
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}
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reqFile := path.Join(h.dir, 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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|
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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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|
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// one or more key=value pairs separated by colons
|
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var safeGitProtocolHeader = regexp.MustCompile(`^[0-9a-zA-Z]+=[0-9a-zA-Z]+(:[0-9a-zA-Z]+=[0-9a-zA-Z]+)*$`)
|
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|
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func prepareGitCmdWithAllowedService(service string, h *serviceHandler) (*git.Command, error) {
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if service == "receive-pack" && h.cfg.ReceivePack {
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return git.NewCommand(h.r.Context(), "receive-pack"), nil
|
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}
|
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if service == "upload-pack" && h.cfg.UploadPack {
|
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return git.NewCommand(h.r.Context(), "upload-pack"), nil
|
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}
|
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|
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return nil, fmt.Errorf("service %q is not allowed", service)
|
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}
|
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|
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func serviceRPC(h *serviceHandler, service string) {
|
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defer func() {
|
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if err := h.r.Body.Close(); err != nil {
|
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log.Error("serviceRPC: Close: %v", err)
|
||||
}
|
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}()
|
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|
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expectedContentType := fmt.Sprintf("application/x-git-%s-request", service)
|
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if h.r.Header.Get("Content-Type") != expectedContentType {
|
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log.Error("Content-Type (%q) doesn't match expected: %q", h.r.Header.Get("Content-Type"), expectedContentType)
|
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h.w.WriteHeader(http.StatusUnauthorized)
|
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return
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}
|
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|
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cmd, err := prepareGitCmdWithAllowedService(service, h)
|
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if err != nil {
|
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log.Error("Failed to prepareGitCmdWithService: %v", err)
|
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h.w.WriteHeader(http.StatusUnauthorized)
|
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return
|
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}
|
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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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|
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reqBody := h.r.Body
|
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|
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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)
|
||||
if err != nil {
|
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log.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
|
||||
h.environ = append(h.environ, "SSH_ORIGINAL_COMMAND="+service)
|
||||
|
||||
if protocol := h.r.Header.Get("Git-Protocol"); protocol != "" && safeGitProtocolHeader.MatchString(protocol) {
|
||||
h.environ = append(h.environ, "GIT_PROTOCOL="+protocol)
|
||||
}
|
||||
|
||||
var stderr bytes.Buffer
|
||||
cmd.AddArguments("--stateless-rpc").AddDynamicArguments(h.dir)
|
||||
cmd.SetDescription(fmt.Sprintf("%s %s %s [repo_path: %s]", git.GitExecutable, service, "--stateless-rpc", h.dir))
|
||||
if err := cmd.Run(&git.RunOpts{
|
||||
Dir: h.dir,
|
||||
Env: append(os.Environ(), h.environ...),
|
||||
Stdout: h.w,
|
||||
Stdin: reqBody,
|
||||
Stderr: &stderr,
|
||||
UseContextTimeout: true,
|
||||
}); err != nil {
|
||||
if err.Error() != "signal: killed" {
|
||||
log.Error("Fail to serve RPC(%s) in %s: %v - %s", service, h.dir, err, stderr.String())
|
||||
}
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
// ServiceUploadPack implements Git Smart HTTP protocol
|
||||
func ServiceUploadPack(ctx *context.Context) {
|
||||
h := httpBase(ctx)
|
||||
if h != nil {
|
||||
serviceRPC(h, "upload-pack")
|
||||
}
|
||||
}
|
||||
|
||||
// ServiceReceivePack implements Git Smart HTTP protocol
|
||||
func ServiceReceivePack(ctx *context.Context) {
|
||||
h := httpBase(ctx)
|
||||
if h != nil {
|
||||
serviceRPC(h, "receive-pack")
|
||||
}
|
||||
}
|
||||
|
||||
func getServiceType(r *http.Request) string {
|
||||
serviceType := r.FormValue("service")
|
||||
if !strings.HasPrefix(serviceType, "git-") {
|
||||
return ""
|
||||
}
|
||||
return strings.TrimPrefix(serviceType, "git-")
|
||||
}
|
||||
|
||||
func updateServerInfo(ctx gocontext.Context, dir string) []byte {
|
||||
out, _, err := git.NewCommand(ctx, "update-server-info").RunStdBytes(&git.RunOpts{Dir: dir})
|
||||
if err != nil {
|
||||
log.Error(fmt.Sprintf("%v - %s", err, string(out)))
|
||||
}
|
||||
return out
|
||||
}
|
||||
|
||||
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)
|
||||
}
|
||||
|
||||
// GetInfoRefs implements Git dumb HTTP
|
||||
func GetInfoRefs(ctx *context.Context) {
|
||||
h := httpBase(ctx)
|
||||
if h == nil {
|
||||
return
|
||||
}
|
||||
h.setHeaderNoCache()
|
||||
service := getServiceType(h.r)
|
||||
cmd, err := prepareGitCmdWithAllowedService(service, h)
|
||||
if err == nil {
|
||||
if protocol := h.r.Header.Get("Git-Protocol"); protocol != "" && safeGitProtocolHeader.MatchString(protocol) {
|
||||
h.environ = append(h.environ, "GIT_PROTOCOL="+protocol)
|
||||
}
|
||||
h.environ = append(os.Environ(), h.environ...)
|
||||
|
||||
refs, _, err := cmd.AddArguments("--stateless-rpc", "--advertise-refs", ".").RunStdBytes(&git.RunOpts{Env: h.environ, Dir: h.dir})
|
||||
if err != nil {
|
||||
log.Error(fmt.Sprintf("%v - %s", err, string(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(ctx, h.dir)
|
||||
h.sendFile("text/plain; charset=utf-8", "info/refs")
|
||||
}
|
||||
}
|
||||
|
||||
// GetTextFile implements Git dumb HTTP
|
||||
func GetTextFile(p string) func(*context.Context) {
|
||||
return func(ctx *context.Context) {
|
||||
h := httpBase(ctx)
|
||||
if h != nil {
|
||||
h.setHeaderNoCache()
|
||||
file := ctx.Params("file")
|
||||
if file != "" {
|
||||
h.sendFile("text/plain", "objects/info/"+file)
|
||||
} else {
|
||||
h.sendFile("text/plain", p)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// GetInfoPacks implements Git dumb HTTP
|
||||
func GetInfoPacks(ctx *context.Context) {
|
||||
h := httpBase(ctx)
|
||||
if h != nil {
|
||||
h.setHeaderCacheForever()
|
||||
h.sendFile("text/plain; charset=utf-8", "objects/info/packs")
|
||||
}
|
||||
}
|
||||
|
||||
// GetLooseObject implements Git dumb HTTP
|
||||
func GetLooseObject(ctx *context.Context) {
|
||||
h := httpBase(ctx)
|
||||
if h != nil {
|
||||
h.setHeaderCacheForever()
|
||||
h.sendFile("application/x-git-loose-object", fmt.Sprintf("objects/%s/%s",
|
||||
ctx.Params("head"), ctx.Params("hash")))
|
||||
}
|
||||
}
|
||||
|
||||
// GetPackFile implements Git dumb HTTP
|
||||
func GetPackFile(ctx *context.Context) {
|
||||
h := httpBase(ctx)
|
||||
if h != nil {
|
||||
h.setHeaderCacheForever()
|
||||
h.sendFile("application/x-git-packed-objects", "objects/pack/pack-"+ctx.Params("file")+".pack")
|
||||
}
|
||||
}
|
||||
|
||||
// GetIdxFile implements Git dumb HTTP
|
||||
func GetIdxFile(ctx *context.Context) {
|
||||
h := httpBase(ctx)
|
||||
if h != nil {
|
||||
h.setHeaderCacheForever()
|
||||
h.sendFile("application/x-git-packed-objects-toc", "objects/pack/pack-"+ctx.Params("file")+".idx")
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user