Allow Protected Branches to Whitelist Deploy Keys (#8483)

Add an option to protected branches to add writing deploy keys to the whitelist for pushing.

Please note this is technically a breaking change: previously if the owner of a repository was on the whitelist then any writing deploy key was effectively on the whitelist. This option will now need to be set if that is desired.

Closes #8472 

Details:
* Allow Protected Branches to Whitelist Deploy Keys
* Add migration
* Ensure that IsDeployKey is set to false on the http pushes
* add not null default false

Author: zeripath

cmd/hook.go

@@ -66,6 +66,7 @@ func runHookPreReceive(c *cli.Context) error {
 	reponame := os.Getenv(models.EnvRepoName)
 	userID, _ := strconv.ParseInt(os.Getenv(models.EnvPusherID), 10, 64)
 	prID, _ := strconv.ParseInt(os.Getenv(models.ProtectedBranchPRID), 10, 64)
+	isDeployKey, _ := strconv.ParseBool(os.Getenv(models.EnvIsDeployKey))
 
 	buf := bytes.NewBuffer(nil)
 	scanner := bufio.NewScanner(os.Stdin)
@@ -98,6 +99,7 @@ func runHookPreReceive(c *cli.Context) error {
 				GitObjectDirectory:              os.Getenv(private.GitObjectDirectory),
 				GitQuarantinePath:               os.Getenv(private.GitQuarantinePath),
 				ProtectedBranchID:               prID,
+				IsDeployKey:                     isDeployKey,
 			})
 			switch statusCode {
 			case http.StatusInternalServerError:

cmd/serv.go

@@ -191,6 +191,8 @@ func runServ(c *cli.Context) error {
 	os.Setenv(models.EnvPusherID, strconv.FormatInt(results.UserID, 10))
 	os.Setenv(models.ProtectedBranchRepoID, strconv.FormatInt(results.RepoID, 10))
 	os.Setenv(models.ProtectedBranchPRID, fmt.Sprintf("%d", 0))
+	os.Setenv(models.EnvIsDeployKey, fmt.Sprintf("%t", results.IsDeployKey))
+	os.Setenv(models.EnvKeyID, fmt.Sprintf("%d", results.KeyID))
 
 	//LFS token authentication
 	if verb == lfsAuthenticateVerb {

models/branches.go

@@ -34,6 +34,7 @@ type ProtectedBranch struct {
 	WhitelistUserIDs          []int64            `xorm:"JSON TEXT"`
 	WhitelistTeamIDs          []int64            `xorm:"JSON TEXT"`
 	EnableMergeWhitelist      bool               `xorm:"NOT NULL DEFAULT false"`
+	WhitelistDeployKeys       bool               `xorm:"NOT NULL DEFAULT false"`
 	MergeWhitelistUserIDs     []int64            `xorm:"JSON TEXT"`
 	MergeWhitelistTeamIDs     []int64            `xorm:"JSON TEXT"`
 	EnableStatusCheck         bool               `xorm:"NOT NULL DEFAULT false"`

models/migrations/migrations.go

@@ -260,6 +260,8 @@ var migrations = []Migration{
 	NewMigration("change length of some external login users columns", changeSomeColumnsLengthOfExternalLoginUser),
 	// v102 -> v103
 	NewMigration("update migration repositories' service type", dropColumnHeadUserNameOnPullRequest),
+	// v103 -> v104
+	NewMigration("Add WhitelistDeployKeys to protected branch", addWhitelistDeployKeysToBranches),
 }
 
 // Migrate database to current version

models/migrations/v103.go

@@ -0,0 +1,18 @@
+// Copyright 2019 The Gitea 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 migrations
+
+import (
+	"xorm.io/xorm"
+)
+
+func addWhitelistDeployKeysToBranches(x *xorm.Engine) error {
+	type ProtectedBranch struct {
+		ID                  int64
+		WhitelistDeployKeys bool `xorm:"NOT NULL DEFAULT false"`
+	}
+
+	return x.Sync2(new(ProtectedBranch))
+}

models/update.go

@@ -22,6 +22,8 @@ const (
 	EnvPusherName   = "GITEA_PUSHER_NAME"
 	EnvPusherEmail  = "GITEA_PUSHER_EMAIL"
 	EnvPusherID     = "GITEA_PUSHER_ID"
+	EnvKeyID        = "GITEA_KEY_ID"
+	EnvIsDeployKey  = "GITEA_IS_DEPLOY_KEY"
 )
 
 // CommitToPushCommit transforms a git.Commit to PushCommit type.

modules/auth/repo_form.go

@@ -152,6 +152,7 @@ type ProtectBranchForm struct {
 	EnableWhitelist         bool
 	WhitelistUsers          string
 	WhitelistTeams          string
+	WhitelistDeployKeys     bool
 	EnableMergeWhitelist    bool
 	MergeWhitelistUsers     string
 	MergeWhitelistTeams     string

modules/private/hook.go

@@ -31,11 +31,12 @@ type HookOptions struct {
 	GitAlternativeObjectDirectories string
 	GitQuarantinePath               string
 	ProtectedBranchID               int64
+	IsDeployKey                     bool
 }
 
 // HookPreReceive check whether the provided commits are allowed
 func HookPreReceive(ownerName, repoName string, opts HookOptions) (int, string) {
-	reqURL := setting.LocalURL + fmt.Sprintf("api/internal/hook/pre-receive/%s/%s?old=%s&new=%s&ref=%s&userID=%d&gitObjectDirectory=%s&gitAlternativeObjectDirectories=%s&gitQuarantinePath=%s&prID=%d",
+	reqURL := setting.LocalURL + fmt.Sprintf("api/internal/hook/pre-receive/%s/%s?old=%s&new=%s&ref=%s&userID=%d&gitObjectDirectory=%s&gitAlternativeObjectDirectories=%s&gitQuarantinePath=%s&prID=%d&isDeployKey=%t",
 		url.PathEscape(ownerName),
 		url.PathEscape(repoName),
 		url.QueryEscape(opts.OldCommitID),
@@ -46,6 +47,7 @@ func HookPreReceive(ownerName, repoName string, opts HookOptions) (int, string)
 		url.QueryEscape(opts.GitAlternativeObjectDirectories),
 		url.QueryEscape(opts.GitQuarantinePath),
 		opts.ProtectedBranchID,
+		opts.IsDeployKey,
 	)
 
 	resp, err := newInternalRequest(reqURL, "GET").Response()

options/locale/locale_en-US.ini

@@ -1334,6 +1334,7 @@ settings.protect_this_branch = Enable Branch Protection
 settings.protect_this_branch_desc = Prevent deletion and disable any Git pushing to the branch.
 settings.protect_whitelist_committers = Enable Push Whitelist
 settings.protect_whitelist_committers_desc = Allow whitelisted users or teams to push to this branch (but not force push).
+settings.protect_whitelist_deploy_keys = Whitelist deploy keys with write access to push
 settings.protect_whitelist_users = Whitelisted users for pushing:
 settings.protect_whitelist_search_users = Search users…
 settings.protect_whitelist_teams = Whitelisted teams for pushing:

routers/private/hook.go

@@ -33,6 +33,7 @@ func HookPreReceive(ctx *macaron.Context) {
 	gitAlternativeObjectDirectories := ctx.QueryTrim("gitAlternativeObjectDirectories")
 	gitQuarantinePath := ctx.QueryTrim("gitQuarantinePath")
 	prID := ctx.QueryInt64("prID")
+	isDeployKey := ctx.QueryBool("isDeployKey")
 
 	branchName := strings.TrimPrefix(refFullName, git.BranchPrefix)
 	repo, err := models.GetRepositoryByOwnerAndName(ownerName, repoName)
@@ -95,7 +96,12 @@ func HookPreReceive(ctx *macaron.Context) {
 			}
 		}
 
-		canPush := protectBranch.CanUserPush(userID)
+		canPush := false
+		if isDeployKey {
+			canPush = protectBranch.WhitelistDeployKeys
+		} else {
+			canPush = protectBranch.CanUserPush(userID)
+		}
 		if !canPush && prID > 0 {
 			pr, err := models.GetPullRequestByID(prID)
 			if err != nil {