473 lines
15 KiB
Go
473 lines
15 KiB
Go
// 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 private includes all internal routes. The package name internal is ideal but Golang is not allowed, so we use private as package name instead.
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package private
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import (
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"fmt"
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"net/http"
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"os"
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"strings"
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"code.gitea.io/gitea/models"
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"code.gitea.io/gitea/models/unit"
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gitea_context "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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"code.gitea.io/gitea/modules/private"
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"code.gitea.io/gitea/modules/web"
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pull_service "code.gitea.io/gitea/services/pull"
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)
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type preReceiveContext struct {
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*gitea_context.PrivateContext
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user *models.User
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perm models.Permission
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canCreatePullRequest bool
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checkedCanCreatePullRequest bool
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canWriteCode bool
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checkedCanWriteCode bool
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protectedTags []*models.ProtectedTag
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gotProtectedTags bool
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env []string
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opts *private.HookOptions
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}
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// User gets or loads User
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func (ctx *preReceiveContext) User() *models.User {
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if ctx.user == nil {
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ctx.user, ctx.perm = loadUserAndPermission(ctx.PrivateContext, ctx.opts.UserID)
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}
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return ctx.user
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}
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// Perm gets or loads Perm
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func (ctx *preReceiveContext) Perm() *models.Permission {
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if ctx.user == nil {
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ctx.user, ctx.perm = loadUserAndPermission(ctx.PrivateContext, ctx.opts.UserID)
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}
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return &ctx.perm
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}
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// CanWriteCode returns true if can write code
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func (ctx *preReceiveContext) CanWriteCode() bool {
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if !ctx.checkedCanWriteCode {
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ctx.canWriteCode = ctx.Perm().CanWrite(unit.TypeCode)
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ctx.checkedCanWriteCode = true
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}
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return ctx.canWriteCode
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}
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// AssertCanWriteCode returns true if can write code
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func (ctx *preReceiveContext) AssertCanWriteCode() bool {
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if !ctx.CanWriteCode() {
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if ctx.Written() {
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return false
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}
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ctx.JSON(http.StatusForbidden, map[string]interface{}{
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"err": "User permission denied.",
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})
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return false
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}
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return true
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}
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// CanCreatePullRequest returns true if can create pull requests
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func (ctx *preReceiveContext) CanCreatePullRequest() bool {
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if !ctx.checkedCanCreatePullRequest {
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ctx.canCreatePullRequest = ctx.Perm().CanRead(unit.TypePullRequests)
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ctx.checkedCanCreatePullRequest = true
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}
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return ctx.canCreatePullRequest
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}
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// AssertCanCreatePullRequest returns true if can create pull requests
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func (ctx *preReceiveContext) AssertCreatePullRequest() bool {
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if !ctx.CanCreatePullRequest() {
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if ctx.Written() {
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return false
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}
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ctx.JSON(http.StatusForbidden, map[string]interface{}{
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"err": "User permission denied.",
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})
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return false
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}
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return true
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}
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// HookPreReceive checks whether a individual commit is acceptable
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func HookPreReceive(ctx *gitea_context.PrivateContext) {
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opts := web.GetForm(ctx).(*private.HookOptions)
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ourCtx := &preReceiveContext{
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PrivateContext: ctx,
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env: generateGitEnv(opts), // Generate git environment for checking commits
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opts: opts,
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}
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// Iterate across the provided old commit IDs
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for i := range opts.OldCommitIDs {
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oldCommitID := opts.OldCommitIDs[i]
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newCommitID := opts.NewCommitIDs[i]
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refFullName := opts.RefFullNames[i]
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switch {
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case strings.HasPrefix(refFullName, git.BranchPrefix):
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preReceiveBranch(ourCtx, oldCommitID, newCommitID, refFullName)
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case strings.HasPrefix(refFullName, git.TagPrefix):
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preReceiveTag(ourCtx, oldCommitID, newCommitID, refFullName)
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case git.SupportProcReceive && strings.HasPrefix(refFullName, git.PullRequestPrefix):
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preReceivePullRequest(ourCtx, oldCommitID, newCommitID, refFullName)
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default:
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ourCtx.AssertCanWriteCode()
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}
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if ctx.Written() {
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return
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}
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}
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ctx.PlainText(http.StatusOK, []byte("ok"))
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}
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func preReceiveBranch(ctx *preReceiveContext, oldCommitID, newCommitID, refFullName string) {
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if !ctx.AssertCanWriteCode() {
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return
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}
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repo := ctx.Repo.Repository
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gitRepo := ctx.Repo.GitRepo
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branchName := strings.TrimPrefix(refFullName, git.BranchPrefix)
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if branchName == repo.DefaultBranch && newCommitID == git.EmptySHA {
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log.Warn("Forbidden: Branch: %s is the default branch in %-v and cannot be deleted", branchName, repo)
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ctx.JSON(http.StatusForbidden, private.Response{
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Err: fmt.Sprintf("branch %s is the default branch and cannot be deleted", branchName),
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})
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return
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}
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protectBranch, err := models.GetProtectedBranchBy(repo.ID, branchName)
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if err != nil {
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log.Error("Unable to get protected branch: %s in %-v Error: %v", branchName, repo, err)
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: err.Error(),
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})
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return
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}
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// Allow pushes to non-protected branches
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if protectBranch == nil || !protectBranch.IsProtected() {
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return
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}
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// This ref is a protected branch.
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//
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// First of all we need to enforce absolutely:
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//
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// 1. Detect and prevent deletion of the branch
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if newCommitID == git.EmptySHA {
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log.Warn("Forbidden: Branch: %s in %-v is protected from deletion", branchName, repo)
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ctx.JSON(http.StatusForbidden, private.Response{
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Err: fmt.Sprintf("branch %s is protected from deletion", branchName),
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})
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return
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}
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// 2. Disallow force pushes to protected branches
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if git.EmptySHA != oldCommitID {
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output, err := git.NewCommand("rev-list", "--max-count=1", oldCommitID, "^"+newCommitID).RunInDirWithEnv(repo.RepoPath(), ctx.env)
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if err != nil {
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log.Error("Unable to detect force push between: %s and %s in %-v Error: %v", oldCommitID, newCommitID, repo, err)
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: fmt.Sprintf("Fail to detect force push: %v", err),
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})
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return
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} else if len(output) > 0 {
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log.Warn("Forbidden: Branch: %s in %-v is protected from force push", branchName, repo)
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ctx.JSON(http.StatusForbidden, private.Response{
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Err: fmt.Sprintf("branch %s is protected from force push", branchName),
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})
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return
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}
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}
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// 3. Enforce require signed commits
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if protectBranch.RequireSignedCommits {
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err := verifyCommits(oldCommitID, newCommitID, gitRepo, ctx.env)
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if err != nil {
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if !isErrUnverifiedCommit(err) {
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log.Error("Unable to check commits from %s to %s in %-v: %v", oldCommitID, newCommitID, repo, err)
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: fmt.Sprintf("Unable to check commits from %s to %s: %v", oldCommitID, newCommitID, err),
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})
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return
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}
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unverifiedCommit := err.(*errUnverifiedCommit).sha
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log.Warn("Forbidden: Branch: %s in %-v is protected from unverified commit %s", branchName, repo, unverifiedCommit)
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ctx.JSON(http.StatusForbidden, private.Response{
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Err: fmt.Sprintf("branch %s is protected from unverified commit %s", branchName, unverifiedCommit),
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})
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return
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}
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}
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// Now there are several tests which can be overridden:
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//
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// 4. Check protected file patterns - this is overridable from the UI
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changedProtectedfiles := false
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protectedFilePath := ""
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globs := protectBranch.GetProtectedFilePatterns()
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if len(globs) > 0 {
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_, err := pull_service.CheckFileProtection(oldCommitID, newCommitID, globs, 1, ctx.env, gitRepo)
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if err != nil {
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if !models.IsErrFilePathProtected(err) {
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log.Error("Unable to check file protection for commits from %s to %s in %-v: %v", oldCommitID, newCommitID, repo, err)
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: fmt.Sprintf("Unable to check file protection for commits from %s to %s: %v", oldCommitID, newCommitID, err),
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})
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return
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}
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changedProtectedfiles = true
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protectedFilePath = err.(models.ErrFilePathProtected).Path
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}
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}
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// 5. Check if the doer is allowed to push
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canPush := false
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if ctx.opts.IsDeployKey {
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canPush = !changedProtectedfiles && protectBranch.CanPush && (!protectBranch.EnableWhitelist || protectBranch.WhitelistDeployKeys)
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} else {
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canPush = !changedProtectedfiles && protectBranch.CanUserPush(ctx.opts.UserID)
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}
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// 6. If we're not allowed to push directly
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if !canPush {
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// Is this is a merge from the UI/API?
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if ctx.opts.PullRequestID == 0 {
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// 6a. If we're not merging from the UI/API then there are two ways we got here:
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//
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// We are changing a protected file and we're not allowed to do that
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if changedProtectedfiles {
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log.Warn("Forbidden: Branch: %s in %-v is protected from changing file %s", branchName, repo, protectedFilePath)
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ctx.JSON(http.StatusForbidden, private.Response{
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Err: fmt.Sprintf("branch %s is protected from changing file %s", branchName, protectedFilePath),
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})
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return
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}
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// Allow commits that only touch unprotected files
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globs := protectBranch.GetUnprotectedFilePatterns()
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if len(globs) > 0 {
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unprotectedFilesOnly, err := pull_service.CheckUnprotectedFiles(oldCommitID, newCommitID, globs, ctx.env, gitRepo)
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if err != nil {
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log.Error("Unable to check file protection for commits from %s to %s in %-v: %v", oldCommitID, newCommitID, repo, err)
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: fmt.Sprintf("Unable to check file protection for commits from %s to %s: %v", oldCommitID, newCommitID, err),
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})
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return
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}
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if unprotectedFilesOnly {
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// Commit only touches unprotected files, this is allowed
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return
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}
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}
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// Or we're simply not able to push to this protected branch
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log.Warn("Forbidden: User %d is not allowed to push to protected branch: %s in %-v", ctx.opts.UserID, branchName, repo)
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ctx.JSON(http.StatusForbidden, private.Response{
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Err: fmt.Sprintf("Not allowed to push to protected branch %s", branchName),
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})
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return
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}
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// 6b. Merge (from UI or API)
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// Get the PR, user and permissions for the user in the repository
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pr, err := models.GetPullRequestByID(ctx.opts.PullRequestID)
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if err != nil {
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log.Error("Unable to get PullRequest %d Error: %v", ctx.opts.PullRequestID, err)
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: fmt.Sprintf("Unable to get PullRequest %d Error: %v", ctx.opts.PullRequestID, err),
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})
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return
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}
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// Now check if the user is allowed to merge PRs for this repository
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// Note: we can use ctx.perm and ctx.user directly as they will have been loaded above
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allowedMerge, err := pull_service.IsUserAllowedToMerge(pr, ctx.perm, ctx.user)
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if err != nil {
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log.Error("Error calculating if allowed to merge: %v", err)
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: fmt.Sprintf("Error calculating if allowed to merge: %v", err),
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})
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return
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}
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if !allowedMerge {
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log.Warn("Forbidden: User %d is not allowed to push to protected branch: %s in %-v and is not allowed to merge pr #%d", ctx.opts.UserID, branchName, repo, pr.Index)
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ctx.JSON(http.StatusForbidden, private.Response{
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Err: fmt.Sprintf("Not allowed to push to protected branch %s", branchName),
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})
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return
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}
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// If we're an admin for the repository we can ignore status checks, reviews and override protected files
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if ctx.perm.IsAdmin() {
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return
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}
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// Now if we're not an admin - we can't overwrite protected files so fail now
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if changedProtectedfiles {
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log.Warn("Forbidden: Branch: %s in %-v is protected from changing file %s", branchName, repo, protectedFilePath)
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ctx.JSON(http.StatusForbidden, private.Response{
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Err: fmt.Sprintf("branch %s is protected from changing file %s", branchName, protectedFilePath),
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})
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return
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}
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// Check all status checks and reviews are ok
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if err := pull_service.CheckPRReadyToMerge(pr, true); err != nil {
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if models.IsErrNotAllowedToMerge(err) {
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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", ctx.opts.UserID, branchName, repo, pr.Index, err.Error())
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ctx.JSON(http.StatusForbidden, private.Response{
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Err: fmt.Sprintf("Not allowed to push to protected branch %s and pr #%d is not ready to be merged: %s", branchName, ctx.opts.PullRequestID, err.Error()),
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})
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return
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}
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log.Error("Unable to check if mergable: protected branch %s in %-v and pr #%d. Error: %v", ctx.opts.UserID, branchName, repo, pr.Index, err)
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: fmt.Sprintf("Unable to get status of pull request %d. Error: %v", ctx.opts.PullRequestID, err),
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})
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return
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}
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}
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}
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func preReceiveTag(ctx *preReceiveContext, oldCommitID, newCommitID, refFullName string) {
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if !ctx.AssertCanWriteCode() {
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return
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}
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tagName := strings.TrimPrefix(refFullName, git.TagPrefix)
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if !ctx.gotProtectedTags {
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var err error
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ctx.protectedTags, err = ctx.Repo.Repository.GetProtectedTags()
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if err != nil {
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log.Error("Unable to get protected tags for %-v Error: %v", ctx.Repo.Repository, err)
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: err.Error(),
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})
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return
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}
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ctx.gotProtectedTags = true
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}
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isAllowed, err := models.IsUserAllowedToControlTag(ctx.protectedTags, tagName, ctx.opts.UserID)
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if err != nil {
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: err.Error(),
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})
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return
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}
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if !isAllowed {
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log.Warn("Forbidden: Tag %s in %-v is protected", tagName, ctx.Repo.Repository)
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ctx.JSON(http.StatusForbidden, private.Response{
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Err: fmt.Sprintf("Tag %s is protected", tagName),
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})
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return
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}
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}
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func preReceivePullRequest(ctx *preReceiveContext, oldCommitID, newCommitID, refFullName string) {
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if !ctx.AssertCreatePullRequest() {
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return
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}
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if ctx.Repo.Repository.IsEmpty {
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ctx.JSON(http.StatusForbidden, map[string]interface{}{
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"err": "Can't create pull request for an empty repository.",
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})
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return
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}
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if ctx.opts.IsWiki {
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ctx.JSON(http.StatusForbidden, map[string]interface{}{
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"err": "Pull requests are not suppported on the wiki.",
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})
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return
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}
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baseBranchName := refFullName[len(git.PullRequestPrefix):]
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baseBranchExist := false
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if ctx.Repo.GitRepo.IsBranchExist(baseBranchName) {
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baseBranchExist = true
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}
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if !baseBranchExist {
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for p, v := range baseBranchName {
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if v == '/' && ctx.Repo.GitRepo.IsBranchExist(baseBranchName[:p]) && p != len(baseBranchName)-1 {
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baseBranchExist = true
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break
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}
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}
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}
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if !baseBranchExist {
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ctx.JSON(http.StatusForbidden, private.Response{
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Err: fmt.Sprintf("Unexpected ref: %s", refFullName),
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})
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return
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}
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}
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func generateGitEnv(opts *private.HookOptions) (env []string) {
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env = os.Environ()
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if opts.GitAlternativeObjectDirectories != "" {
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env = append(env,
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private.GitAlternativeObjectDirectories+"="+opts.GitAlternativeObjectDirectories)
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}
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if opts.GitObjectDirectory != "" {
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env = append(env,
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private.GitObjectDirectory+"="+opts.GitObjectDirectory)
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}
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if opts.GitQuarantinePath != "" {
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env = append(env,
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private.GitQuarantinePath+"="+opts.GitQuarantinePath)
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}
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return env
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}
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func loadUserAndPermission(ctx *gitea_context.PrivateContext, id int64) (user *models.User, perm models.Permission) {
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user, err := models.GetUserByID(id)
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if err != nil {
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log.Error("Unable to get User id %d Error: %v", id, err)
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: fmt.Sprintf("Unable to get User id %d Error: %v", id, err),
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})
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return
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}
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perm, err = models.GetUserRepoPermission(ctx.Repo.Repository, user)
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if err != nil {
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log.Error("Unable to get Repo permission of repo %s/%s of User %s", ctx.Repo.Repository.OwnerName, ctx.Repo.Repository.Name, user.Name, err)
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ctx.JSON(http.StatusInternalServerError, private.Response{
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Err: fmt.Sprintf("Unable to get Repo permission of repo %s/%s of User %s: %v", ctx.Repo.Repository.OwnerName, ctx.Repo.Repository.Name, user.Name, err),
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})
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return
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}
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return
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}
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