forgejo/routers/private/hook.go
6543 c52d48aae4
Prevent merge of outdated PRs on protected branches (#11012)
* Block PR on Outdated Branch

* finalize

* cleanup

* fix typo and sentences

thanks @guillep2k

Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com>

Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>
Co-authored-by: Lauris BH <lauris@nix.lv>
2020-04-16 22:00:36 -03:00

564 lines
19 KiB
Go

// 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 private includes all internal routes. The package name internal is ideal but Golang is not allowed, so we use private as package name instead.
package private
import (
"bufio"
"context"
"fmt"
"io"
"net/http"
"os"
"strings"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/private"
"code.gitea.io/gitea/modules/repofiles"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
pull_service "code.gitea.io/gitea/services/pull"
"gitea.com/macaron/macaron"
"github.com/go-git/go-git/v5/plumbing"
"github.com/gobwas/glob"
)
func verifyCommits(oldCommitID, newCommitID string, repo *git.Repository, env []string) error {
stdoutReader, stdoutWriter, err := os.Pipe()
if err != nil {
log.Error("Unable to create os.Pipe for %s", repo.Path)
return err
}
defer func() {
_ = stdoutReader.Close()
_ = stdoutWriter.Close()
}()
err = git.NewCommand("rev-list", oldCommitID+"..."+newCommitID).
RunInDirTimeoutEnvFullPipelineFunc(env, -1, repo.Path,
stdoutWriter, nil, nil,
func(ctx context.Context, cancel context.CancelFunc) error {
_ = stdoutWriter.Close()
err := readAndVerifyCommitsFromShaReader(stdoutReader, repo, env)
if err != nil {
log.Error("%v", err)
cancel()
}
_ = stdoutReader.Close()
return err
})
if err != nil && !isErrUnverifiedCommit(err) {
log.Error("Unable to check commits from %s to %s in %s: %v", oldCommitID, newCommitID, repo.Path, err)
}
return err
}
func checkFileProtection(oldCommitID, newCommitID string, patterns []glob.Glob, repo *git.Repository, env []string) error {
stdoutReader, stdoutWriter, err := os.Pipe()
if err != nil {
log.Error("Unable to create os.Pipe for %s", repo.Path)
return err
}
defer func() {
_ = stdoutReader.Close()
_ = stdoutWriter.Close()
}()
err = git.NewCommand("diff", "--name-only", oldCommitID+"..."+newCommitID).
RunInDirTimeoutEnvFullPipelineFunc(env, -1, repo.Path,
stdoutWriter, nil, nil,
func(ctx context.Context, cancel context.CancelFunc) error {
_ = stdoutWriter.Close()
scanner := bufio.NewScanner(stdoutReader)
for scanner.Scan() {
path := strings.TrimSpace(scanner.Text())
if len(path) == 0 {
continue
}
lpath := strings.ToLower(path)
for _, pat := range patterns {
if pat.Match(lpath) {
cancel()
return models.ErrFilePathProtected{
Path: path,
}
}
}
}
if err := scanner.Err(); err != nil {
return err
}
_ = stdoutReader.Close()
return err
})
if err != nil && !models.IsErrFilePathProtected(err) {
log.Error("Unable to check file protection for commits from %s to %s in %s: %v", oldCommitID, newCommitID, repo.Path, err)
}
return err
}
func readAndVerifyCommitsFromShaReader(input io.ReadCloser, repo *git.Repository, env []string) error {
scanner := bufio.NewScanner(input)
for scanner.Scan() {
line := scanner.Text()
err := readAndVerifyCommit(line, repo, env)
if err != nil {
log.Error("%v", err)
return err
}
}
return scanner.Err()
}
func readAndVerifyCommit(sha string, repo *git.Repository, env []string) error {
stdoutReader, stdoutWriter, err := os.Pipe()
if err != nil {
log.Error("Unable to create pipe for %s: %v", repo.Path, err)
return err
}
defer func() {
_ = stdoutReader.Close()
_ = stdoutWriter.Close()
}()
hash := plumbing.NewHash(sha)
return git.NewCommand("cat-file", "commit", sha).
RunInDirTimeoutEnvFullPipelineFunc(env, -1, repo.Path,
stdoutWriter, nil, nil,
func(ctx context.Context, cancel context.CancelFunc) error {
_ = stdoutWriter.Close()
commit, err := git.CommitFromReader(repo, hash, stdoutReader)
if err != nil {
return err
}
verification := models.ParseCommitWithSignature(commit)
if !verification.Verified {
cancel()
return &errUnverifiedCommit{
commit.ID.String(),
}
}
return nil
})
}
type errUnverifiedCommit struct {
sha string
}
func (e *errUnverifiedCommit) Error() string {
return fmt.Sprintf("Unverified commit: %s", e.sha)
}
func isErrUnverifiedCommit(err error) bool {
_, ok := err.(*errUnverifiedCommit)
return ok
}
// HookPreReceive checks whether a individual commit is acceptable
func HookPreReceive(ctx *macaron.Context, opts private.HookOptions) {
ownerName := ctx.Params(":owner")
repoName := ctx.Params(":repo")
repo, err := models.GetRepositoryByOwnerAndName(ownerName, repoName)
if err != nil {
log.Error("Unable to get repository: %s/%s Error: %v", ownerName, repoName, err)
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"err": err.Error(),
})
return
}
repo.OwnerName = ownerName
gitRepo, err := git.OpenRepository(repo.RepoPath())
if err != nil {
log.Error("Unable to get git repository for: %s/%s Error: %v", ownerName, repoName, err)
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"err": err.Error(),
})
return
}
defer gitRepo.Close()
// Generate git environment for checking commits
env := os.Environ()
if opts.GitAlternativeObjectDirectories != "" {
env = append(env,
private.GitAlternativeObjectDirectories+"="+opts.GitAlternativeObjectDirectories)
}
if opts.GitObjectDirectory != "" {
env = append(env,
private.GitObjectDirectory+"="+opts.GitObjectDirectory)
}
if opts.GitQuarantinePath != "" {
env = append(env,
private.GitQuarantinePath+"="+opts.GitQuarantinePath)
}
for i := range opts.OldCommitIDs {
oldCommitID := opts.OldCommitIDs[i]
newCommitID := opts.NewCommitIDs[i]
refFullName := opts.RefFullNames[i]
branchName := strings.TrimPrefix(refFullName, git.BranchPrefix)
protectBranch, err := models.GetProtectedBranchBy(repo.ID, branchName)
if err != nil {
log.Error("Unable to get protected branch: %s in %-v Error: %v", branchName, repo, err)
ctx.JSON(500, map[string]interface{}{
"err": err.Error(),
})
return
}
if protectBranch != nil && protectBranch.IsProtected() {
// detect and prevent deletion
if newCommitID == git.EmptySHA {
log.Warn("Forbidden: Branch: %s in %-v is protected from deletion", branchName, repo)
ctx.JSON(http.StatusForbidden, map[string]interface{}{
"err": fmt.Sprintf("branch %s is protected from deletion", branchName),
})
return
}
// detect force push
if git.EmptySHA != oldCommitID {
output, err := git.NewCommand("rev-list", "--max-count=1", oldCommitID, "^"+newCommitID).RunInDirWithEnv(repo.RepoPath(), env)
if err != nil {
log.Error("Unable to detect force push between: %s and %s in %-v Error: %v", oldCommitID, newCommitID, repo, err)
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"err": fmt.Sprintf("Fail to detect force push: %v", err),
})
return
} else if len(output) > 0 {
log.Warn("Forbidden: Branch: %s in %-v is protected from force push", branchName, repo)
ctx.JSON(http.StatusForbidden, map[string]interface{}{
"err": fmt.Sprintf("branch %s is protected from force push", branchName),
})
return
}
}
// Require signed commits
if protectBranch.RequireSignedCommits {
err := verifyCommits(oldCommitID, newCommitID, gitRepo, env)
if err != nil {
if !isErrUnverifiedCommit(err) {
log.Error("Unable to check commits from %s to %s in %-v: %v", oldCommitID, newCommitID, repo, err)
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"err": fmt.Sprintf("Unable to check commits from %s to %s: %v", oldCommitID, newCommitID, err),
})
return
}
unverifiedCommit := err.(*errUnverifiedCommit).sha
log.Warn("Forbidden: Branch: %s in %-v is protected from unverified commit %s", branchName, repo, unverifiedCommit)
ctx.JSON(http.StatusForbidden, map[string]interface{}{
"err": fmt.Sprintf("branch %s is protected from unverified commit %s", branchName, unverifiedCommit),
})
return
}
}
// Detect Protected file pattern
globs := protectBranch.GetProtectedFilePatterns()
if len(globs) > 0 {
err := checkFileProtection(oldCommitID, newCommitID, globs, gitRepo, env)
if err != nil {
if !models.IsErrFilePathProtected(err) {
log.Error("Unable to check file protection for commits from %s to %s in %-v: %v", oldCommitID, newCommitID, repo, err)
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"err": fmt.Sprintf("Unable to check file protection for commits from %s to %s: %v", oldCommitID, newCommitID, err),
})
return
}
protectedFilePath := err.(models.ErrFilePathProtected).Path
log.Warn("Forbidden: Branch: %s in %-v is protected from changing file %s", branchName, repo, protectedFilePath)
ctx.JSON(http.StatusForbidden, map[string]interface{}{
"err": fmt.Sprintf("branch %s is protected from changing file %s", branchName, protectedFilePath),
})
return
}
}
canPush := false
if opts.IsDeployKey {
canPush = protectBranch.CanPush && (!protectBranch.EnableWhitelist || protectBranch.WhitelistDeployKeys)
} else {
canPush = protectBranch.CanUserPush(opts.UserID)
}
if !canPush && opts.ProtectedBranchID > 0 {
// Merge (from UI or API)
pr, err := models.GetPullRequestByID(opts.ProtectedBranchID)
if err != nil {
log.Error("Unable to get PullRequest %d Error: %v", opts.ProtectedBranchID, err)
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"err": fmt.Sprintf("Unable to get PullRequest %d Error: %v", opts.ProtectedBranchID, err),
})
return
}
user, err := models.GetUserByID(opts.UserID)
if err != nil {
log.Error("Unable to get User id %d Error: %v", opts.UserID, err)
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"err": fmt.Sprintf("Unable to get User id %d Error: %v", opts.UserID, err),
})
return
}
perm, err := models.GetUserRepoPermission(repo, user)
if err != nil {
log.Error("Unable to get Repo permission of repo %s/%s of User %s", repo.OwnerName, repo.Name, user.Name, err)
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"err": fmt.Sprintf("Unable to get Repo permission of repo %s/%s of User %s: %v", repo.OwnerName, repo.Name, user.Name, err),
})
return
}
allowedMerge, err := pull_service.IsUserAllowedToMerge(pr, perm, user)
if err != nil {
log.Error("Error calculating if allowed to merge: %v", err)
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"err": fmt.Sprintf("Error calculating if allowed to merge: %v", err),
})
return
}
if !allowedMerge {
log.Warn("Forbidden: User %d is not allowed to push to protected branch: %s in %-v and is not allowed to merge pr #%d", opts.UserID, branchName, repo, pr.Index)
ctx.JSON(http.StatusForbidden, map[string]interface{}{
"err": fmt.Sprintf("Not allowed to push to protected branch %s", branchName),
})
return
}
// Check all status checks and reviews is ok, unless repo admin which can bypass this.
if !perm.IsAdmin() {
if err := pull_service.CheckPRReadyToMerge(pr); err != nil {
if models.IsErrNotAllowedToMerge(err) {
log.Warn("Forbidden: User %d is not allowed push to protected branch %s in %-v and pr #%d is not ready to be merged: %s", opts.UserID, branchName, repo, pr.Index, err.Error())
ctx.JSON(http.StatusForbidden, map[string]interface{}{
"err": fmt.Sprintf("Not allowed to push to protected branch %s and pr #%d is not ready to be merged: %s", branchName, opts.ProtectedBranchID, err.Error()),
})
return
}
log.Error("Unable to check if mergable: protected branch %s in %-v and pr #%d. Error: %v", opts.UserID, branchName, repo, pr.Index, err)
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"err": fmt.Sprintf("Unable to get status of pull request %d. Error: %v", opts.ProtectedBranchID, err),
})
}
}
} else if !canPush {
log.Warn("Forbidden: User %d is not allowed to push to protected branch: %s in %-v", opts.UserID, branchName, repo)
ctx.JSON(http.StatusForbidden, map[string]interface{}{
"err": fmt.Sprintf("Not allowed to push to protected branch %s", branchName),
})
return
}
}
}
ctx.PlainText(http.StatusOK, []byte("ok"))
}
// HookPostReceive updates services and users
func HookPostReceive(ctx *macaron.Context, opts private.HookOptions) {
ownerName := ctx.Params(":owner")
repoName := ctx.Params(":repo")
var repo *models.Repository
updates := make([]*repofiles.PushUpdateOptions, 0, len(opts.OldCommitIDs))
wasEmpty := false
for i := range opts.OldCommitIDs {
refFullName := opts.RefFullNames[i]
// Only trigger activity updates for changes to branches or
// tags. Updates to other refs (eg, refs/notes, refs/changes,
// or other less-standard refs spaces are ignored since there
// may be a very large number of them).
if strings.HasPrefix(refFullName, git.BranchPrefix) || strings.HasPrefix(refFullName, git.TagPrefix) {
if repo == nil {
var err error
repo, err = models.GetRepositoryByOwnerAndName(ownerName, repoName)
if err != nil {
log.Error("Failed to get repository: %s/%s Error: %v", ownerName, repoName, err)
ctx.JSON(http.StatusInternalServerError, private.HookPostReceiveResult{
Err: fmt.Sprintf("Failed to get repository: %s/%s Error: %v", ownerName, repoName, err),
})
return
}
if repo.OwnerName == "" {
repo.OwnerName = ownerName
}
wasEmpty = repo.IsEmpty
}
option := repofiles.PushUpdateOptions{
RefFullName: refFullName,
OldCommitID: opts.OldCommitIDs[i],
NewCommitID: opts.NewCommitIDs[i],
PusherID: opts.UserID,
PusherName: opts.UserName,
RepoUserName: ownerName,
RepoName: repoName,
}
updates = append(updates, &option)
if repo.IsEmpty && option.IsBranch() && option.BranchName() == "master" {
// put the master branch first
copy(updates[1:], updates)
updates[0] = &option
}
}
}
if repo != nil && len(updates) > 0 {
if err := repofiles.PushUpdates(repo, updates); err != nil {
log.Error("Failed to Update: %s/%s Total Updates: %d", ownerName, repoName, len(updates))
for i, update := range updates {
log.Error("Failed to Update: %s/%s Update: %d/%d: Branch: %s", ownerName, repoName, i, len(updates), update.BranchName())
}
log.Error("Failed to Update: %s/%s Error: %v", ownerName, repoName, err)
ctx.JSON(http.StatusInternalServerError, private.HookPostReceiveResult{
Err: fmt.Sprintf("Failed to Update: %s/%s Error: %v", ownerName, repoName, err),
})
return
}
}
results := make([]private.HookPostReceiveBranchResult, 0, len(opts.OldCommitIDs))
// We have to reload the repo in case its state is changed above
repo = nil
var baseRepo *models.Repository
for i := range opts.OldCommitIDs {
refFullName := opts.RefFullNames[i]
newCommitID := opts.NewCommitIDs[i]
branch := git.RefEndName(opts.RefFullNames[i])
if newCommitID != git.EmptySHA && strings.HasPrefix(refFullName, git.BranchPrefix) {
if repo == nil {
var err error
repo, err = models.GetRepositoryByOwnerAndName(ownerName, repoName)
if err != nil {
log.Error("Failed to get repository: %s/%s Error: %v", ownerName, repoName, err)
ctx.JSON(http.StatusInternalServerError, private.HookPostReceiveResult{
Err: fmt.Sprintf("Failed to get repository: %s/%s Error: %v", ownerName, repoName, err),
RepoWasEmpty: wasEmpty,
})
return
}
if repo.OwnerName == "" {
repo.OwnerName = ownerName
}
if !repo.AllowsPulls() {
// We can stop there's no need to go any further
ctx.JSON(http.StatusOK, private.HookPostReceiveResult{
RepoWasEmpty: wasEmpty,
})
return
}
baseRepo = repo
if repo.IsFork {
if err := repo.GetBaseRepo(); err != nil {
log.Error("Failed to get Base Repository of Forked repository: %-v Error: %v", repo, err)
ctx.JSON(http.StatusInternalServerError, private.HookPostReceiveResult{
Err: fmt.Sprintf("Failed to get Base Repository of Forked repository: %-v Error: %v", repo, err),
RepoWasEmpty: wasEmpty,
})
return
}
baseRepo = repo.BaseRepo
}
}
if !repo.IsFork && branch == baseRepo.DefaultBranch {
results = append(results, private.HookPostReceiveBranchResult{})
continue
}
pr, err := models.GetUnmergedPullRequest(repo.ID, baseRepo.ID, branch, baseRepo.DefaultBranch)
if err != nil && !models.IsErrPullRequestNotExist(err) {
log.Error("Failed to get active PR in: %-v Branch: %s to: %-v Branch: %s Error: %v", repo, branch, baseRepo, baseRepo.DefaultBranch, err)
ctx.JSON(http.StatusInternalServerError, private.HookPostReceiveResult{
Err: fmt.Sprintf(
"Failed to get active PR in: %-v Branch: %s to: %-v Branch: %s Error: %v", repo, branch, baseRepo, baseRepo.DefaultBranch, err),
RepoWasEmpty: wasEmpty,
})
return
}
if pr == nil {
if repo.IsFork {
branch = fmt.Sprintf("%s:%s", repo.OwnerName, branch)
}
results = append(results, private.HookPostReceiveBranchResult{
Message: setting.Git.PullRequestPushMessage && repo.AllowsPulls(),
Create: true,
Branch: branch,
URL: fmt.Sprintf("%s/compare/%s...%s", baseRepo.HTMLURL(), util.PathEscapeSegments(baseRepo.DefaultBranch), util.PathEscapeSegments(branch)),
})
} else {
results = append(results, private.HookPostReceiveBranchResult{
Message: setting.Git.PullRequestPushMessage && repo.AllowsPulls(),
Create: false,
Branch: branch,
URL: fmt.Sprintf("%s/pulls/%d", baseRepo.HTMLURL(), pr.Index),
})
}
}
}
ctx.JSON(http.StatusOK, private.HookPostReceiveResult{
Results: results,
RepoWasEmpty: wasEmpty,
})
}
// SetDefaultBranch updates the default branch
func SetDefaultBranch(ctx *macaron.Context) {
ownerName := ctx.Params(":owner")
repoName := ctx.Params(":repo")
branch := ctx.Params(":branch")
repo, err := models.GetRepositoryByOwnerAndName(ownerName, repoName)
if err != nil {
log.Error("Failed to get repository: %s/%s Error: %v", ownerName, repoName, err)
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"Err": fmt.Sprintf("Failed to get repository: %s/%s Error: %v", ownerName, repoName, err),
})
return
}
if repo.OwnerName == "" {
repo.OwnerName = ownerName
}
repo.DefaultBranch = branch
gitRepo, err := git.OpenRepository(repo.RepoPath())
if err != nil {
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"Err": fmt.Sprintf("Failed to get git repository: %s/%s Error: %v", ownerName, repoName, err),
})
return
}
if err := gitRepo.SetDefaultBranch(repo.DefaultBranch); err != nil {
if !git.IsErrUnsupportedVersion(err) {
gitRepo.Close()
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"Err": fmt.Sprintf("Unable to set default branch onrepository: %s/%s Error: %v", ownerName, repoName, err),
})
return
}
}
gitRepo.Close()
if err := repo.UpdateDefaultBranch(); err != nil {
ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
"Err": fmt.Sprintf("Unable to set default branch onrepository: %s/%s Error: %v", ownerName, repoName, err),
})
return
}
ctx.PlainText(200, []byte("success"))
}